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1
Perez, de Larraya Espinosa Mikel. "Photovoltaic Power Plant Aging." Thesis, Högskolan i Gävle, Avdelningen för byggnadsteknik, energisystem och miljövetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-33252.
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One of the most pressing problems nowadays is climate change and global warming. As it name indicates, it is a problem that concerns the whole earth. There is no doubt that the main cause for this to happen is human, and very related to non-renewable carbon-based energy resources. However, technology has evolved, and some alternatives have appeared in the energy conversion sector. Nevertheless, they are relatively young yet. Since the growth in renewable energies technologies wind power and PV are the ones that have taken the lead. Wind power is a relatively mature technology and even if it still has challenges to overcome the horizon is clear. However, in the PV case the technology is more recent. Even if it is true that PV modules have been used in space applications for more than 60 years, large scale production has not begun until last 10 years. This leaves the uncertainty of how will PV plants and modules age. The author will try to analyse the aging of a specific 63 kWp PV plant located in the roof of a building in Gävle, monitoring production and ambient condition data, to estimate the degradation and the new nominal power of the plant. It has been found out that the degradation of the system is not considerable. PV modules and solar inverters were studied, and even if there are more elements in the system, those are the principal ones. PV modules suffered a degradation of less than 5%, while solar inverters’ efficiency dropped from 95,4% to around 93%.
2
Bengtsson, Sara. "Modelling of a Power System in a Combined Cycle Power Plant." Thesis, Uppsala universitet, Elektricitetslära, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-149318.
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Simulators for power plants can be used for many different purposes, like training for operators or for adjusting control systems, where the main objective is to perform a realistic behaviour for different operating conditions of the power plant. Due to an increased amount of variable energy sources in the power system, the role of the operators has become more important. It can therefore be very valuable for the operators to try different operating conditions like island operation. The aim of this thesis is to model the power system of a general combined-cycle power plant simulator. The model should contain certain components and have a realistic behaviour but on the same time be simple enough to perform simulations in real time. The main requirements are to simulate cold start, normal operation, trip of generator, a controlled change-over to island operation and then resynchronisation. The modelling and simulations are executed in the modelling software Dymola, version 6.1. The interface for the simulator is built in the program LabView, but that is beyond the scope of this thesis. The results show a reasonable performance of the power system with most of the objectives fulfilled. The simulator is able to perform a start-up, normal load changes, trip of a generator, change-over to island operation as well as resynchronisation of the power plant to the external power grid. However, the results from the changing-over to island operation, as well as large load losses during island operation, show an unreasonable behaviour of the system regarding the voltage magnitude at that point. This is probably due to limitations in calculation capacity of Dymola, and the problem has been left to further improvements due to lack of time. There has also been a problem during the development of a variable speed regulated induction motor and it has not been possible to make it work due to lack of enough knowledge about how Dymola is performing the calculations. Also this problem has been left to further improvements due to lack of time.
3
Cregan, J. "Thermoeconomic monitoring of power plant condenser sub system." Thesis, Queen's University Belfast, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.411755.
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Bomstad, Fredrik, and Kjetil Nordland. "Energy System for LNG Plant Based on Imported Power." Thesis, Norwegian University of Science and Technology, Department of Energy and Process Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9021.
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It has been proposed to supply heat and power to Snøhvit Train II (STII) from onsite heat generation based on natural gas and power import from the power grid. Without carbon capture and storage, greenhouse gas (GHG) emissions from the combustion of natural gas in furnaces make a considerable contribution to the global warming potential (GWP) of this energy system. Depending on the interpretation of marginal power consumption, the power import also contributes to and increases this systems GWP. A recent SINTEF report claimed that European CO2 emissions are reduced with additional renewable power production in Norway, and it has been suggested to invest in wind power in order to completely offset the GWP of the STII energy system. This paper provides investment analyses for the proposed energy system. A scenario approach was used, with six different scenarios covering two dimensions. The first dimension is the origin of the grid power, with three different interpretations of marginal power representing Cases A, B and C. The other dimension is the STII train size, with two different sizes being analyzed, namely 50 % and 70 % of the Snøhvit Train I design capacity. The proposed energy system was also analyzed with respect to security of supply. Improved reliability and transmission capacity, together with a stable, positive power balance, make a good foundation for security of power supply. The power demand of the two train sizes was estimated to 101 MW and 141 MW, with corresponding heat demand of 94 MW and 131 MW. These estimates were based on a combination of HYSYS simulations and data provided by StatoilHydro (SH), and provided input for both the GWP analysis and the investment analysis. The GWP impact of each scenario determined the share of power import from the grid that would have to be replaced by energy harnessed from wind. The applied capacity factor was 39.6 %, and the rated wind power requirement for the six different scenarios ranged from 101 MW for the A.50 scenario to 257 MW for the C.70 scenario. The break even (BE) energy prices were calculated for each of the six scenarios analyzed. If the power consumption is based solely on power import, with zero StatoilHydro (SH) share of grid reinforcements and no SH development of wind power, the BE power price would be 466 NOK/MWh. The inclusion of wind power development as part of the investment will increase the BE power price by up to 33 NOK/MWh. The additional SH share of grid reinforcement will add 86 NOK/MWh for the 50 % STII or 62 NOK/MWh for the 70 % STII. It was shown that the investment in wind power to offset the GWP of the energy system might also be a reasonable way of hedging against increases in the market price of electricity. It was found that the share of STII power demand that is provided by wind power is one of the parameters that have the least influence on the projects net present value (NPV). A high share of wind power is an inexpensive investment in improving reputation and predictability of energy price.
5
Chan, Lai Cheong. "Investigation on energy efficiency of electrical power system in Macau Coloane power plant." Thesis, University of Macau, 2012. http://umaclib3.umac.mo/record=b2586280.
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6
Boesak, Dawid John Johannes. "Voltage stability analysis of a power system network comprising a nuclear power plant." Master's thesis, Faculty of Engineering and the Built Environment, 2018. http://hdl.handle.net/11427/30056.
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As recently as 2016, the performance of South Africa’s power utility has shown that it is not resilient enough to withstand the consequences of a power system blackout. Blackouts are defined as being a form of power system instability that can be brought about by a variety of abnormal network scenarios. The most common modes of failure are grouped under the term power system stability. In this dissertation, the different modes of power stability that can affect a nuclear power station will be investigated and discussed. The particular phenomenon that will be focused on, however, is the effect that voltage instability has on the ability of generators and loads to perform their standard functions, thus ensuring a secure power system. To investigate the effect that voltage instability has on a nuclear power station, this dissertation will look at relevant literature on the topic. In addition, by extracting from common examples of national and international occurrences of voltage stability, this dissertation will record the effects that this phenomenon has on the security of a power system, in particular on nuclear power plants. To model the network containing a nuclear power plant for the evaluation of voltage stability, the different mathematical models of the generation plant are presented, which include: the automatic voltage regulator, power system stabilizer, governor, nuclear reactor, and excitation system. Also presented are mathematical models of network equipment such as under voltage tap changers and the dynamic loads that are of interest when evaluating voltage stability. The models used for evaluation of the voltage stability phenomenon affecting a nuclear power plant and the surrounding integrated power system are built in the Digsilent PowerFactory® software. The scenario for evaluation is based on a voltage stability event that occurred around at the Koeberg nuclear power system situated in the Western Cape province on South Africa on 15 October 2003. It is commonly accepted that voltage stability can be evaluated at a steady state level by performing power versus voltage (PV) analysis to determine the voltage buses vulnerable to voltage collapse, and reactive power versus voltage (QV) analysis to determine the critical reactive devices required to avert a voltage instability event. The scenarios that are evaluated for voltage stability are divided into two sections: i) a PV and QV analysis as per the event that occurred on 15 October 2003 and ii) present-day voltage stability indices for PV and QV if mixed with a generation such as renewable energy sources that include wind, solar, biomass and concentrated solar power (CSPs). The result reveals the vulnerabilities of the nuclear power plant and the surrounding integrated power system due to a voltage instability event. Some of the solutions proposed include a review of the typical power system protection schemes — such as under and overvoltage detection scheme — that are used. In the study, PV and QV curves provide v good indications of the state of critical busbars and the reactive power reserve margins available before instability can potentially settle in. Simulations confirmed the effectiveness of critical equipment installed in the Western Grid and the effect on their electrical parameters such as torque and the slip on motors.
7
Opara, Chigozie Ethelvivian. "Energy Efficiency of the HVAC System of a Power Plant." OpenSIUC, 2015. https://opensiuc.lib.siu.edu/theses/1741.
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This study models the HVAC system of a power plant. It involved Computer simulations to study the energy demand by the HVAC system of the power plant as well as the energy demand of the system with modifications on the plant such as the building materials, use of energy efficient lighting, etc. Further studies on the energy demand of the system with the power plant located at different regions of the country were done to understand the effects of climate and locations. It is important to have an understanding of how a plant generating energy uses it for Heating, Ventilating and Air conditioning within the power plant building itself. This study has provided a better understanding of the energy use and how the HVAC system use in the offices and other areas located in the power plant building operates. The study included implementation of energy efficient measures in the choice of building materials for the building. The U.S. Department of Energy (DOE) EnergyPlus program was used to model the HVAC system of the power plant making use of the parameters and modified parameters of the power plant. The results of this study show that the energy demand of the HVAC system of a power plant is significantly affected by the choice of materials for the building. It was found that there is a reduction in the power demand of the HVAC system of the plant by about an average of about 21.7 % at the different the locations. It was also found that this resulted in the amount of energy saved per year of about 87,600 kWh. This gives an average cost savings per year of about $10,512.
8
Khabrana, Ahmed, and Jaber Ageeli. "Producing Electricity in Power Plant." Thesis, Blekinge Tekniska Högskola, Institutionen för tillämpad signalbehandling, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-1979.
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Abstract This Bachelor thesis has been written at the Blekinge Institute of Technology. The thesis describes electricity production in Shoaiba Steam Power plant in Saudi Arabia. Shoaiba Power Plant is located 100 km South of Jeddah city in Saudi Arabia. Total power production ability reaches 4400 MW. Shoaiba Power Plant has two stages and is constructed with 11 units, each unit produces 400 MW at line voltage 24 kV and line current 16 kA. Main pieces of equipment and their function in the station are as follows: A Steam Generator (boiler), produces steam by burning natural gas or crude oil in the furnace. The steam is superheated and is passed into a steam turbine, which converts the thermal energy of the steam into mechanical power, in form of rotary motion. The turbine drives a generator, which converts the rotary energy of the turbine into electric power. Steam generator, steam turbine and electrical generator are components that are described in the thesis. When the flow of steam to the turbine is controlled, then the amount of thermal energy that changes to mechanical energy in the steam turbine is controlled. The electrical generator is where the final energy conversion takes place. The mechanical energy from the turbine is converted by the generator into electrical energy, which is transmitted to the service area by help of electrical transmission lines. The plant cycle is an essential part of the energy flow path. Without the plant cycle, the conversion of thermal energy into mechanical energy would not occur, The plant cycle is a closed loop that allows the same water to be used over and over again. Always, the power plants are situated far from residential areas and located outside cities and close to the sea, because the steam is produced from seawater. The advantages of the steam power stations are as follows: They can produce high amounts of electrical energy from small amounts of fuel. They have low initial costs, obstetrics and maintenance costs are not high, and the stations do not need much space to be built and they have usually high capacity. The disadvantages of steam stations are the following: They cause environmental pollution, they have low efficiency, and require very big quantities of cooling water, and the stations must be built away from populated areas.Conclusion: Converting in steam power plant is one of many ways to produce electrical energy in the world. It can be done in any country because it can be done with different chemical sources. In Saudi Arabia we use oil, because it easier and cheaper than any other chemical source for us. As any country would use what is better for them. The thesis has described circulation system in Shoaiba power plant by converting chemical energy to thermal energy in the boiler, then the turbine converts thermal energy to mechanical energy. Then the mechanical energy is converted to electrical energy in the generator. The advantages of the steam stations are as follows: production of high amounts of electrical energy from small amounts of fuel, low cost of the initial costs, obstetrics and maintenance costs are not high, the station does not need much space to build and they are usually high capacity. The disadvantages of steam stations are the following: environmental pollution, low efficiency, requires very big amounts of cooling water, and these stations must be built away from population areas.
0706397524
9
Andrade, Dagmar Luz de. "An object-oriented knowledge-based system for hydroelectric power plant turbine selection." Ohio : Ohio University, 1992. http://www.ohiolink.edu/etd/view.cgi?ohiou1171487350.
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Ruiz, Álvaro. "System aspects of large scale implementation of a photovoltaic power plant." Thesis, KTH, Elektriska energisystem, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-53719.
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In this thesis the static and dynamic behavior of large scale grid connected PV power plants are analyzed. A model of a 15 MW power plant is developed and implemented in DIgSilent Power Factory. The model considers all the panels operating at the MPP of the V-I characteristic with cos- = 1. The static behavior of this PV power plant connected to the grid is analyzed. To perform this analysis, the 15 MW power plant model is connected to a realistic grid. Two different static aspects are studied by using the U-Q curves of the PV power plant: variations of the injected active power of the PV power plant and variations of the short circuit power of the grid. As the injected active power is very dependent on the sun’s irradiation, the first analysis is performed in order to analyze the behavior of the PV power plant when the injected power is reduced. The second analysis is performed is to determine the influence of lower short circuit power at the PCC where the PV power plant can be connected in order to maintain a reasonable voltage level. Spain and Germany have started to develop a grid code which will be applied to these large scale power plants. Spain is one of the European countries which has a better potential of PV solar electricity and the government is giving a lot of subsidies to develop this technology. German government is also giving a lot of subsidies to develop PV technology. An analysis of the requirements of both grid codes is made concerning to the voltage dips and how the developed model of the PV power plant fulfills these requirements. Finally, as wind power technology is one of the most common renewable energy resources that is being developed in these days, a comparison between the model of the PV power plant and a model of a wind power farm of the same nominal power is made. The differences in steady state condition and dynamic condition of both technologies will be discussed and how both technologies fulfill the grid codes’ requirements mentioned before. During the fault, the behavior of both technologies is very different. The LVRT behavior of both technologies will be compared, when a pure three phase fault at the PCC occurs.
11
Turek, Michael Gerald. "System dynamics analysis of financial factors in nuclear power plant operations." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/37007.
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Chu, Xinyuan. "System dynamics modeling for human performance in nuclear power plant operation." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/41297.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Nuclear Science and Engineering, 2006.Includes bibliographical references (p. 62).
Perfect plant operation with high safety and economic performance is based on both good physical design and successful organization. However, in comparison with the affection that has been paid to technology research, the effort that has been exerted to enhance NPP management and organization, namely human performance, seems pale and insufficient. There is a need to identify and assess aspects of human performance that are predictive of plant safety and performance and to develop models and measures of these performance aspects that can be used for operation policy evaluation, problem diagnosis, and risk-informed regulation. The challenge of this research is that: an NPP is a system that is comprised of human and physics subsystems. Every human department includes different functional workers, supervisors, and managers; while every physical component can be in normal status, failure status, or a being-repaired status. Thus, an NPP's situation can be expressed as a time-dependent function of the interactions among a large number of system elements. The interactions between these components are often non-linear and coupled, sometime there are direct or indirect, negative or positive feedbacks, and hence a small interference input either can be suppressed or can be amplified and may result in a severe accident finally. This research expanded ORSIM (Nuclear Power Plant Operations and Risk Simulator) model, which is a quantitative computer model built by system dynamics methodology, on human reliability aspect and used it to predict the dynamic behavior of NPP human performance, analyze the contribution of a single operation activity to the plant performance under different circumstances, diagnose and prevent fault triggers from the operational point of view, and identify good experience and policies in the operation of NPPs.
(cont.) Regarding the human reliability analysis function, the partial Standardized Plant Analysis Risk Human Reliability Analysis (SPAR-H) method was applied. Performance Shaping Factors (PSFs) were employed to analyze the influence of human performance indicators already existing in ORSIM. Based on the human performance model, an operation case study was investigated. A series of carefully chosen candidate policies were tested on a computerized model that represents the structure, processes, and interactions of the underlying target NPP systems. These candidates included: (1) New management system application; (2) Personnel population change, (3) Planning delay, and (4) Tolerance to surprise workload.
by Xinyuan Chu.
S.M.
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Trayhorn, Benjamin. "Power plant system reliability analysis : applications to insurance risk selection and pricing." Thesis, Cranfield University, 2012. http://dspace.lib.cranfield.ac.uk/handle/1826/7906.
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Within the Speciality Engineering Insurance Field the use of engineering opinion is the main component in risk analysis for underwriting decision making. The use of risk analysis tools to quantify the risk associated with perils such as mechanical breakdown is limited. A reliability model for the risk analysis of mechanical breakdown risk for the power generation sector, PowerRAT, has been developed and its performance evaluated against historic claim data. It has proven to closely forecast actual losses over a portfolio of power plants, and differentiate between power plant type; conventional steam, simple and combined cycle gas turbine plants. Differentiation based on the factors of equipment type and policy terms has been demonstrated. A review of existing survey report methodology has shown highly variable quality of reports with significant missing information on which to make underwriting decisions. A best practice survey report contents has been proposed in order to provide a consistent level of information for comparison with other risks. The development cycle of PowerRAT has led to a proposed framework for the development of future risk assessment tools for insurance. This is built on four main areas: risk identification, data analysis, calculation methodology and insurance factors.
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Zhang, Yanan. "System-Oriented Dynamic Modelling and Power Consumption Simulationfor an Industrial Chiller Plant." Thesis, KTH, Energiteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-287725.
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Nowadays, the amount of energy consumed by Heating, Ventilation and Air Conditioning (HVAC) systemsposes threats to the improvement of global environment. Hence people have been dedicated to thedevelopment of energy-saving retrofit projects via optimized simulation in these chiller plants. However, recent research only focuses on the improvement of one or two devices instead of whole operating system,and researchers seldom pay attention to the comparison between different optimization strategies.As a result, by using Modelica/Dymola framework, a system-oriented dynamic model is constructed via theon-site investigation of an industrial chiller plant which located in Chengdu, China in this project. This system is composed of the individual control of multiple chillers, water pumps and cooling towers with a relative mean absolute error (RMAE) of 1.4% in the energy consumption simulation and hence can be regarded as a reliable model for further optimizations. After the implantation of two-months simulated data as system configuration, three optimization strategies including Baseline Strategy (BS), Sequence Optimization (SO) and Holistic Optimization (HO) within the full range cooling load ratio are investigated to explore the potentials of energy savings for this model. Among all three optimization approaches, HO strategy shows the outperforming reduction in energy consumption by 10.8% especially at low range of cooling load ratio. Moreover, based on HO method, two more advanced strategies which named as Holistic Optimization based on Cooling Load Time FrequencyAnalysis (HOTF) and Holistic Optimization based on Cooling Load Distribution Analysis (HOCL) are explored. The results turn out that both optimization strategies on this model can further decrease the energy consumption by 2.6% and 4.0% accordingly. In addition to this, HOTF also shows its own strength on low cost and operation simplicity.
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Yilmaz, Oguz. "Participation Of Combined Cycle Power Plants To Power System Frequency Control: Modeling And Application." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607228/index.pdf.
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This thesis proposes a method and develops a model for the participation of a combined cycle power plant to power system frequency control.
Through the period of integration to the UCTE system, (Union for Coordination of Transmission of Electricity in Europe) frequency behavior of Turkey&rsquos grid and studies related to its improvement had been a great concern, so is the reason that main subject of my thesis became as &ldquo
Power System Frequency Control&rdquo
. Apart from system-wide global control action (secondary control)
load control loops at power plants, reserve power and its provision even at the minimum capacity generation stage, (primary control) are the fundamental concerns of this subject. The adjustment of proper amount of reserve at the power plants, and correct system response to any kind of disturbance, in the overall, are measured by the quality of the frequency behaviour of the system. A simulator that will simulate a dynamic gas turbine and its control system model, together with a combined cycle power plant load controller is the outcome of this thesis.
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Sharifnia, Hamidreza. "Safety related model and studies of Trojan Nuclear Power Plant electrical distribution system." PDXScholar, 1988. https://pdxscholar.library.pdx.edu/open_access_etds/3875.
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The most important requirement for running a nuclear power plant safely is having a reliable safety system, especially during the emergency shutdown condition. For performing a scrutiny load flow and voltage drop study a detailed and comprehensive electrical model for the emergency electrical distribution system of the Trojan Nuclear Power Plant has been developed. This model includes the representation of the transformers, circuit breakers, motors, cables and load data from 4160 volts level down to the individual 480 volts loads.
17
Starr, Fred. "The development of an expert system for failure analysis of power plant components." Thesis, University of Surrey, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.441722.
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Hamza, Hamza Ali Adel. "Selection and justification the parameters of diesel power plant with heat recovery system." Thesis, NTU "KhPI", 2017. http://repository.kpi.kharkov.ua/handle/KhPI-Press/31664.
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Dissertation for the degree of candidate of technical sciences in specialty 05.05.03 – engines and power plants. – National Technical University "Kharkiv Polytechnic Institute". – Kharkiv, 2017. The dissertation is devoted to the choice and substantiation of parameters of a diesel power plant with heat recovery system of recycling the secondary heat from diesel engine using the Rankin cycle, which uses the heat of exhaust gases and cooling water systems. As a result of the analysis of the features of a promising power plant with a Hyundai 25/33 engine for the production of electric power at a plant in Iraq, a technological scheme of a comprehensive system for recycling diesel fuel from an electric power station with the additional generation of electricity, heat for heating heavy fuel, condensing technical water from exhaust gases. As a working fluid in the Rankin cycle, it is advisable to use the hot water from the engine cooling system. Using the developed mathematical model of the distillation circuit of the diesel power plant, the design-experimental study of the influence of the ambient temperature on the indicators of the efficiency of heat recovery was performed. When the ambient temperature changes from 0 ° C to 40 ° C, the amount of electric energy generated by the Rankin cycle for the Hyundai H25 / 33 engine increases to 10%. With a single cogeneration unit with a Hyundai H25 / 33 engine and a recycling complex developed, it is possible to get up to 2300 kg of water vapor condensate per day, which is very valuable in Iraq. Based on the results of the study, two variants of the technological scheme (projects A and B) were developed for the modernization of Hyundai diesel power plants. The feasibility study for the NPV method has shown that after the full recovery equipment is put into operation, the maximum achievable profit will be about 1 406 219 $ /year.Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.05.03 – двигуни та енергетичні установки. – Національний технічний університет "Харківський політехнічний інститут". – Харків, 2017. Дисертація присвячена вибору і обґрунтуванню параметрів дизель-електричної станції з системою утилізації вторинної теплоти дизеля з використанням циклу Ренкіна, що використовує теплоту відпрацьованих газів та системи охолодження. В результаті аналізу особливостей перспективної енергетичної установки з двигуном Hyundai 25/33 для виробництва електричної енергії на заводі в Іраку розроблена технологічна схема комплексної системи утилізації вторинної теплоти дизель-електричної станції з додатковим отриманням електроенергії, теплоти для підігріву важкого палива, конденсації технічної води з відпрацьованих газів двигуна. Для утилізації вторинної теплоти двигуна Hyundai H25/33 запропоновано утилізаційний контур установки, який працює за органічним циклом Ренкіна (ОЦР). В якості робочого тіла в циклі Ренкіна доцільно використовувати воду системи охолодження двигуна. З використанням розробленої математичної моделі утилізаційного контуру дизель-електростанції виконане розрахунково-експериментальне дослідження впливу температури навколишнього середовища на показники ефективності утилізаційного контуру. При зміні температури навколишнього середовища від 0 ° С до 40 ° С кількість електроенергії, виробленої за циклом Ренкіна для двигуна Hyundai H25/33 збільшується до 10%. При роботі однієї когенераційної установки з двигуном Hyundai H25/33 та розробленим утилізаційним комплексом можна отримати на добу до 2300 кг конденсату водяної пари, що є дуже цінною в Іраку. На основі результатів дослідження було розроблено два варіанта технологічної схеми (проекти "А" та "Б") модернізації дизельних електростанцій компанії Hyundai Heavy Industries. Виконана техніко-економічна оцінка проектів за метод NPV показала, що після того, як обладнання утилізаційного контуру в повному обсязі буде введено у експлуатацію, максимально досяжний прибуток складе близько 1 406 219 дол. США/рік.
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Ha, Jaejoo. "CBDS : constraint based diagnostic system for malfunction identification in the nuclear power plant /." The Ohio State University, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487776210792359.
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Meadowcroft, Brian K. "Hidden Failures in Shipboard Electrical Integrated Propulsion Plants." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/42754.
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The differences between shipboard and land based power systems are explored to support the main focus of this work. A model was developed for simulating hidden failures on shipboard integrated propulsion plants, IPP. The model was then used to evaluate the segregation of the IPP high voltage, HV, buses in a similar fashion as a shipboard firemain. The HV buses were segregated when loss of propulsion power would put the ship as risk. This new treatment reduces the region of vulnerability by providing a high impedance boundary that limits the effects of a hidden failure of a current magnitude or differential based protective element, without the installation of any additional hardware or software. It is shown that this protection could be further improved through the use of a simple adaptive protection scheme that disarms unneeded protective elements in certain configurations.Master of Science
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Ghanbari, Ahmad, and Muhydeen Oyelakin. "Management System for Operations Mantenanace in Offshore Wind Turbine Plant." Thesis, Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-16937.
Full textAbstract:
Management system for enhancing transfer of knowledge in wind power industry has not received sufficient research attention in recent times. In some cases, the wind power plant owner does not control the management system for operation and maintenance activities. Most of these wind power plants are under contract and rely upon the turbine vendor to perform most of the maintenance works and subsequently share their experience at the initial stage of operation. This research investigates the management system for the operations and maintenance activities of the offshore wind plant in Lillgrund. The research also explores the type of learning method that was adopted by the wind turbine vendor (Siemens) to transfer the operation and maintenance knowledge to the operator and owner (Vattenfall) within the speculated period. It was realized that in the next one year, the Vattenfall would be in full control of the operations and maintenance activities of the offshore wind power plant in Lillgrund. The co-management arrangement will give Siemens a good reputation and gainful experience in the wind power industry. The arrangement is achievable due to Siemens strategy to strive for constructive and long-standing relationships with their customer, based on trust, respect, and honesty. Vattenfall on the other hand, is aiming to be the partner of choice for their suppliers at the same time as best serving their internal customers. The provision for the training during the co-management period enables Siemens to strengthen their relationship with Vattenfall in this industry. In addition, Siemens also maintain close relationship with their customers and develop a large part of their portfolio, frequently on site. Vattenfall improves profitability and value creation, as a fundamental prerequisite for continued growth. The management systems of Vattenfall can be related to professional bureaucracy, this is due to the fact that it was organized to accommodate Siemens experts. Vattenfall benefits from the co-management activities of the operation and maintenance of the Lillgrund wind power plant for a specific period of time. The outcome of the research work has proven that there is an effective time-dependent proportionality for a gradual transfer of the technical knowledge of operation and maintenance from Siemens Wind AB to the Vattenfall personnel. The research started from the perspective of the maintenance method by Swedish standard for wind power, and the way things are being carried out in a more practical way in Lillgrund plant.
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Yang, Wenli Lee Kwang Y. Smith Elizabeth Bradford. "An intelligent control system for a hybrid fuel cell with gas turbine power plant." [University Park, Pa.] : Pennsylvania State University, 2009. http://etda.libraries.psu.edu/theses/approved/PSUonlyIndex/ETD-4620/index.html.
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Vorster, Christo. "Fault diagnostic system for predictive maintenance on a Brayton cycle power plant / C. Vorster." Thesis, North-West University, 2004. http://hdl.handle.net/10394/254.
Full textAbstract:
Model-based fault detection and diagnostic systems have become an important solution (Munoz &
Sanz-Bobi, 1998:178) in the industry for preventive maintenance. This not only increases plant
safety, but also reduces down time and financial losses. This paper investigates a model-based
fault detection and diagnostic system by using neural networks.
To mimic process models, a normal feed-forward neural network with time delays is implemented
by using the MATLAB@ neural network toolbox. By using these neural network models, residuals
are generated. These residuals are then classified by using other neural networks. The main
process in question is the Brayton cycle thermal process used in the pebble bed modular reactor.
Flownet simulation software is used to generate the data, where practical data is absent.
Various training algorithms were implemented and tested during the investigation of modelling
and classification concepts on two benchmark processes. The training algorithm that performed
best was finally implemented in an integrated conceptThesis (M.Ing. (Electronical Engineering))--North-West University, Potchefstroom Campus, 2004.
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Yan, Xinglong. "Dynamic analysis and control system design for an advanced nuclear gas turbine power plant." Thesis, Massachusetts Institute of Technology, 1990. http://hdl.handle.net/1721.1/14069.
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Oudet, Alexandre. "Design and optimization of the HVAC system for a nuclear power plant demineralization station." Thesis, KTH, Energiteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-192184.
Full textAbstract:
Avstängda kärnkraftverk berövar många människor av elektricitet och det skulle ha en negativ inverkan både på företagets framtoning och mänskliga aktiviteter. På grund av detta behöver tillgängligheten av utrustningen i alla byggnaderna som kärnkraftverken består ses till. HVAC-system (Heating, Ventilation and Air Conditioning) spelar en viktig roll när det gäller tillgänglighet av utrustning eftersom dessa system ser till pålitligheten är på topp genom att anpassade omgivningsförhållanden till utrustningen. Att designa ventilationssystemet rätt är därför mycket viktigt och måste göras noggrant. Denna rapport introducerar metodologin för att designa och optimera ett ventilationssystem för en av byggnaderna i ett kärnkraftverk. Utöver detta utvecklas och beskrivs en metodologi för att designa ett rökkontrollssystem för en byggnad som ingår i kärnkraftverket. Dessa metodologier har implementerats för en byggnad i en demineraliseringsstation, Hinkley Point C project.During nuclear power plants shutdown many people could be deprived of electricity and it would have a negative impact both on the company’s image and on people activities. As a consequence, availability of equipments in the different buildings which compose the power plant needs to be assured. HVAC system (Heating, Ventilation and Air Conditioning) plays an important role on the reliability of these equipments as it makes sure that ambient conditions in the buildings fit the operating temperature range of the equipments. Consequently sizing a ventilation system is really important and it needs to be carried out seriously. This paper introduces the methodology to size and optimize a ventilation system for nuclear power plants’ building. This paper also develops the methodology used to size a smoke control system in a nuclear related building. Direct application of this methodology has been realised for a specific building which is the demineralization station of Hinkley Point C project.
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Kim, Keung Koo. "Design and simulation of a digital control system for a multi-modular power plant." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/12931.
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Han, Song. "Retrofitting CHP Plant and Optimization of Regional Energy System." Licentiate thesis, Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-13185.
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The use of biomass-based combined heat and power (CHP) plants is considered by the EU administration to be an effective way to increase the use of renewables in the energy system, to reduce greenhouse gas emissions and to alleviate the dependency on imported fossil fuels. At present in Sweden, most of the CHP plants are operated in part-load mode because of variations in heat demand. Further use of the potential heat capacity from CHP plants is an opportunity for integration with other heat-demanding processes. Retrofitting the conventional CHP plants by integration with bioethanol and pellet production processes is considered a feasible and efficient way to improve the plants’ performances. Modeling and simulation of the CHP plant integrated with feedstock upgrading, bioethanol production and pellet production is performed to analyze the technical and economic feasibility. When integrating with bioethanol production, the exhaust flue gas from the CHP plant is used to dry the hydrolysis solid residues (HSR) instead of direct condensation in the flue gas condenser (FGC). This drying process not only increases the overall energy efficiency (OEE) of the CHP plant but also increases the power output relative to the system using only a FGC. Furthermore, if steam is extracted from the turbine of the CHP plant and if it is used to dry the HSR together with the exhaust flue gas, pellets can be produced and the bioethanol production costs can be reduced by 30% compared with ethanol cogeneration plants. Three optional pellet production processes integrated with an existing biomass-based CHP plant using different raw materials are studied to determine their annual performance. The option of pellet production integrated with the existing CHP plant using exhaust flue gas and superheated steam for drying allows for a low specific pellet production cost, short payback time and significant CO2 reduction. A common advantage of the three options is a dramatic increase in the total annual power production and a significant CO2 reduction, in spite of a decrease in power efficiency. The retrofitted biomass-based CHP plants play a crucial role in the present and future regional energy system. The total costs are minimized for the studied energy system by using wastes as energy sources. Analyses of scenarios for the coming decades are performed to describe how to achieve a regional fossil fuel-free energy system. It is possible to achieve the target by upgrading and retrofitting the present energy plants and constructing new ones. The conditions and obstacles have also been presented and discussed through optimizing the locations for proposed new energy plants and planting energy crops.REMOWE, CSC
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SILVA, AUCYONE A. da. "An integrated approach for plant monitoring and diagnosis using multiresolution wavelet analysis." reponame:Repositório Institucional do IPEN, 1997. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11643.
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Tese (Doutoramento)
IPEN/T
The University of Tennessee
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Horkeby, Kristofer. "Simulation of Heat Recovery Steam Generator in a Combined Cycle Power Plant." Thesis, Linköpings universitet, Institutionen för systemteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-75836.
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This thesis covers the modelling of a Heat Recovery Steam Generator (HRSG) in a Combined Cycle Power Plant(CCPP). This kind of power plant has become more and more utilized because of its high efficiency and low emissions. The HRSG plays a central role in the generation of steam using the exhaust heat from the gas turbine. The purpose of the thesis was to develop efficient dynamic models for the physical components in the HRSG using the modelling and simulation software Dymola. The models are then to be used for simulations of a complete CCPP.The main application is to use the complete model to introduce various disturbances and study their consequences inthe different components in the CCPP by analyzing the simulation results. The thesis is a part of an ongoingdevelopment process for the dynamic simulation capabilities offered by the Solution department at SIT AB. First, there is a theoretical explanation of the CCPP components and control system included in the scope of this thesis. Then the development method is described and the top-down approach that was used is explained. The structure and equations used are reported for each of the developed models and a functional description is given. Inorder to ensure that the HRSG model would function in a complete CCPP model, adaptations were made and tuning was performed on the existing surrounding component models in the CCPP. Static verifications of the models are performed by comparison to Siemens in-house software for static calculations. Dynamic verification was partially done, but work remains to guarantee the validity in a wide operating range. As a result of this thesis efficient models for the drum boiler and its control system have been developed. An operational model of a complete CCPP has been built. This was done integrating the developed models during the work with this thesis together with adaptations of already developed models. Steady state for the CCPP model is achieved during simulation and various disturbances can then be introduced and studied. Simulation time for a typical test case is longer than the time limit that has been set, mainly because of the gas turbine model. When using linear functions to approximate the gas turbine start-up curves instead, the simulation finishes within the set simulation time limit of 5 minutes for a typical test case.
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Compadre, Senar David. "Performance evaluation of a rooftop solar photovoltaic power plant in the Gävle Arenaby (Gävle, Sweden): Installation testing." Thesis, Högskolan i Gävle, Energisystem, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-26931.
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The current energy situation is taking a turn towards renewable energies, due to the new pacts to curb global warming. These agreements, together with governmental aid, are facilitating an escalation in the production and improvement of new energy systems and the price decrease due to a larger-scale production. Within these energy alternatives, solar energy is found, specifically the subject to be treated in this project is photovoltaic energy, due to its exponential growth in the last 10 years, new tools are being developed for its monitoring and modelling. Therefore, the main objective of this thesis is to develop a method for installation testing of a PV-system. The method should give the installed nominal power of the system and show if the maximum power point trackers work as expected. A large PV-system was installed on the roof of Gävle Arenaby during 2017. A measurement system for monitoring of the power of the system and of the solar irradiance was installed. Different parameters have been taken into account for the adjustment of the model that vary the performance of the system. These factors are: the irradiance received, the module temperature and the angle of incidence. It has been concluded that the results obtained indicate a correct adjustment of the theoretical power against the real power, which means, a correct operation of the generated model. Besides, the expected power follows a linear trend, reaching the power set by the manufacturer for Standard Test Conditions. The results show that the monitored modules-strings fulffill the promised performance and the method for installation testing work as expected. The linear correlation between corrected power and irradiance means that the maximum power point tracker in the inverter works independent of the power.
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Shimeles, Surafel. "Thermo-economic Analysis of Retrofitting an Existing Coal-Fired Power Plant with Solar Heat." Thesis, Högskolan i Gävle, Avdelningen för bygg- energi- och miljöteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-17216.
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At a time when global environmental change is posing a growing challenge to the world’s economy and creating uncertainties to livelihood of its inhabitants, Coal thermal power plants are under pressure to meet stringent environmental regulations into achieving worldwide set millennial goals for mitigating the effect of emission gases on the atmosphere. Owing to its abundance, it is unlikely to see the use of coal completely missing from the global energy mix within the next hundred years to come. While innovative emission reduction technologies are evolving for the better, trendy technological solutions which require reintegration of these coal plants with alternative greener fuels are growing at the moment. Among these solutions, the following paper investigates possible means for repowering a coal steam power plant with indirect solar heating solutions to boost its annual outputs. Two widely deployable solar thermal technologies, parabolic trough and Central tower receiver systems, are introduced at different locations in the steam plant to heat working fluid thereby enhancing the thermodynamic quality of steam being generated. Potential annual energy output was estimated using commercially available TRNSYS software upon mass and heat balance to every component of solar and steam plant. The annual energy outputs are weighed against their plant erecting and running costs to evaluate the economic vitality of the proposed repowering options. The results show that parabolic trough heating method could serve as the most cost effective method generating electricity at competitive prices than solar only powered SEGS plants. While cost may be acceptable in the unit of energy sense, the scale of implementation has been proven to be technically limited.Kriel Power Plant
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Pelo, Herbert Leburu. "Evaluation of an advanced fault detection system using Koeberg nuclear power plant data / H.L. Pelo." Thesis, North-West University, 2013. http://hdl.handle.net/10394/9686.
Full textAbstract:
The control and protection system of early nuclear power plants (Generation II) have been designed and built on the then reliable analog system. Technology has evolved in recent times and digital system has replaced most analog technology in most industries. Due to safety precautions and robust licensing requirements in the nuclear industry, the analog and digital system works concurrent to each other in most control and protection systems of nuclear power plants. Due to the ageing, regular maintenance and intermittent operation, the analog plant system often gives faulty signals. The objective of this thesis is to simulate a transient using a simulator to reduce the effects of system faults on the nuclear plant control and protection system, by detecting the faults early. The following steps will be performed:
• validating the simulator measurements by simulating a normal operation,
• detecting faults early on in the system
These can be performed by resorting to a model that generates estimates of the correct sensors signal values based on actual readings and correlations among them. The next step can be performed by a fault detection module which determines early whether or not the plant systems are behaving normally and detects the fault. (Baraldi P. et al, 2010.)Thesis (MSc (Engineering Sciences in Nuclear Engineering))--North-West University, Potchefstroom Campus, 2013.
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Smith, Jesse E. "The Feasibility of Developing a Computer Based Expert System to Mitigate Nuclear Power Plant Accidents." NSUWorks, 2000. http://nsuworks.nova.edu/gscis_etd/847.
Full textAbstract:
This study investigated the feasibility of developing a rule-based expert system to support nuclear plant operators in the mitigation of accidents. Human error in the use of Emergency Operating Procedures (EOPs) was the problem to be addressed. The goal was to determine if the Nuclear Plant Information System (NPIS) at one specific power plant would support development of an EOP operator aid to reduce the number of human errors.
A review of the literature confirmed that human error is a recurring problem. This is particularly evident during high stress situations, such as accidents. A rule-based operator aid can reduce human performance errors. This made the research significant enough to justify its undertaking. Previous studies have developed rule-based operator aids for new plant design, but ignored nuclear plants constructed before the availability of computers.
The data required for performance of each Emergency Operating Procedure step was identified. Individual step data requirements were compared to data presently available from the Nuclear Plant Information System. For needed data not directly available, alternative parameters were selected where possible. The alternative parameters provide the same plant information to the operator as that described in the Emergency Operating Procedure step. Parameters that cannot be monitored directly or by an alternative method are identified. This was documented in an EOP data matrix. Using the EOPs, a set of rules was developed for a 10, 000-gpm large break loss of coolant accident (LBLOCA). A plant specific simulator scenario for a LBLOCA was conducted. Data collection was performed during this scenario. A comparison of the collected data to the EOP rules determined all required information is not available. This was documented in an EOP rules matrix. A separate matrix compiled all parameters not directly on NPIS and without an acceptable alternative. The effect of each missing parameter on the mitigation strategy is documented.
An EOP expert performed an independent verification of the rules matrix. This verifies correctness of the rules and the required data. A NPIS database expert performed an additional independent verification of unavailable NPIS data. This verified that the matrix data identified as unavailable from NPIS was correct. The study resulted in a set of recommendations for improving plant process computers, EOP procedures, and EOP development techniques. This approach may be used in other nuclear plants. Additional research avenues were identified.
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Zheng, Yu Yao, and 鄭宇堯. "Power System Analysis of Cogeneration Plant." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/37447897136032786559.
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碩士長庚大學
電機工程學系
98
This thesis focuses on the power system analysis of an actual cogeneration plant. The analysis includes power flow calculation, short-circuit current analysis, transient stability evaluation, and voltage sag analysis. First, the system structure of the plant including synchronous generators, induction motors, and transformers are built. The power flow analysis ensures that all equipments are operated under their rated capacities in all possible situations. The short circuit analysis identifies that the fault currents on each bus are within their momentary and interrupting withstanding levels. The transient stability analysis evaluates that the cogeneration plant can recovery from utility faults and possible grid-disconnection behaviors. The voltage sag analysis ensures that sensitive loads in the plant won’t trip because of faults. The above analysis results can provide field personnel with useful information to enhance the overall operation reliability of the plant.
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Chih-Cheng, Wang, and 王至誠. "Hydro Power Plant Control System Retrofit." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/81711901962538677463.
Full textAbstract:
碩士國立高雄應用科技大學
電機工程系博碩士班
102
This thesis presents the hydro power plant control system retrofit. For many years commencial operating hydro power plant, the parts of plant control system were stopping production because of parts and technics upgrade. It takes very high cost to purchase spare parts from original supplier or OEM manufacture. Also the existing control system in hydro power plant was running abnormal because of aging of existing parts. If we can define hydro control system retrofit standard procedure. Not only faster the control system retrofit speed, also can use newest technics and better solution for retrofitting. If new retrofitting control system were not suited to exsting operating machine. Once the old control system was took off. The existing machine tuning parameter was gone too. This may cause retrofit job fail. The plant cannot generate power and customer not accept for this issue. Or the new control system cannot get accurtae parameter from OEM manufaturer. It may cause machine runing at low effeniciency condition. This study is to define control system retrofit procedure. Follow this procedure and apply for Dachshi Hydro plant control, switch yard control, remote control and gate control retroftting job executing. Follow this procedure and apply for LiuQueng Hydro Governor control system retrofit job too. Both retrofit projects were sucessful. The standard procedure will make sure each component function well. For total plant operating effenicency, it needs experience and technical expertise to adjust system. Finally, the proposed experience and result obtained can be guided to the work on other control system retrofit.
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Liu, Shih-Chun, and 劉世均. "The Power System SCADA for Petrochemical Plant." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/56149160572572509456.
Full textAbstract:
碩士中原大學
電機工程研究所
103
This report ”The Power System SCADA for Petrochemical Plant” is a research about the power system SCADA engineering of Taiwan Taoyuan refinery Petroleum Corporation. The main substation is the electricity supply center of the refinery plant. Through building SCADA power monitoring system, we can monitor the power supply condition and the operation situation of each refinery equipment. This report designs a power system SCADA which includes a complete main substation and secondary substation power supply circuit diagrams, the information of electricity usages and the condition of the equipment. The system can provide the functions which can be executed by personal computer including the control and monitoring of equipment, and data acquisition. For data communication, LAN and internet standard communication interface are used to connect the Remote Terminal Units (RTUs) of main substation and downstream secondary substations. This report comprehensively introduces and analyzes the power SCADA system. It is valuable for the company which plans to implement the power SCADA system especially for the application of petrochemical plant.
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Wu, Shang-Wei, and 吳尚瑋. "Effects of Large Power Plant on Power System Dynamic Stability." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/51793288745215208727.
Full textAbstract:
碩士國立臺灣海洋大學
電機工程學系
96
The main objective of this thesis is to study the dynamic stability characteristics of a power system with a large power plant installed for operation. The method of frequency domain analysis is utilized for the study with which the eigenstructure (eigenvalues with associated eigenvectors and participation factors) of each electromechanical oscillation mode can be computed for the analysis of system dynamic stability. Electromechanical oscillations include inter-area mode and intra-area (local and intra-plant) mode of oscillations. The inter-area mode often has lower frequency and damping ratio and affects relatively more numbers of generators. In this thesis, the eigenstructures of all electromechanical oscillation mode of the studied power system, with longitudinal structure and four geographic (northern, central, southern, and eastern) areas, are first computed. The results show that the system damping conforms to the criterion of dynamic stability under both peak load and light load operations. There is relatively more power imbalance between areas under light load since a net power is transferred from the northern area to the central area due to the operation of pumped storage units, and thus the damping ratio of the system under light load is lower than that under peak load. It is recommended that the inter-area oscillation mode be the focus of dynamic stability study for the studied system.
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Peng, Hung-Hsin, and 彭鴻心. "Integration of Multi-Reservoir’s Flood Control and Management Information System for Water Power Plant —Takuan Power Plant." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/02764635550170939311.
Full textAbstract:
碩士大葉大學
資訊管理學系碩士班
92
The target of this paper focuses on the flood control systems of three dams managed by Takuan Power Plant. The system utilizes existing equipment to construct the flood control system and to help employees calculate data and store them into databases. Employees can thus transfer these data into inventories for information sharing. The system not only promotes hardware performance effectively but also solves problems of insufficiency resources for specific printer type. The system does not modify the original system; on the contrary, we plug a Programmable Logic Controller (PLC) into the system as a monitoring module. After capturing data, this system will send these data to PLC of the control center. The system can read and store these data via Intranet. This system has been constructed by using Unified Modeling Language to analyze and design a web-based flood control system. The primary contribution of this research is to provide a flood control system and generate reservoir natural flow volume after analyzing the altitudes, bondages and duties of water. This architecture can avoid human mistakes by collecting relative data.
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Wang, Yuan-He, and 王元和. "A Detection Support System on Surveillance System in Nuclear Power Plant." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/90404747869860387883.
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碩士國立清華大學
工業工程與工程管理學系
98
This study is to develop a technique of behavior observation to detect insider?Ss abnormal behavior and workers’ emergent situation such as heart attack or fall down in NPP in order to prevent safety hazard due to workers’ unusual behavior. Moreover, experiment has been carried out in the viewpoint of human factors engineering for the purpose of comparing conventional surveillance system and the surveillance system with Unusual Behavior Detection support system (UBDSS) to measure system effectiveness and workload reduction First of all, the scenario and possible abnormal behavior in NPP were discussed. Next, the simulated video data was shot and, with image process algorithm, captured and transferred into three numerical variables that interpreting human action including gesture, moving speed and moving angle. The three variables were then analyzed with decision tree method to construct a model for finding relation among the three variables and the behavior observed. The rules of decision tree classification were used to predict new video data, which formed UBDSS. Afterward, an experiment was conducted to verify system effectiveness and reduction of workload by computing response time, error rate and NASA TLX task load index. The results of this study indicated that unusual behavior prediction rate of UBDSS is acceptably high (average classification rate = 83.01), and auto-alarm system with UBDSS is able to improve system performance as results of experiment indicated that the response time decreased about 42.9% and the error rate decreased about 62.1%. The result of this study can be applied on other relevant industries such as suicide preventions of labor-intensive industry and secure protection in safety-concerned facilities such as government office.
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HUANG, HSUAN-HAN, and 黃宣翰. "Design of the Power Regulating Auxiliary System for Lungmen Nuclear Power Plant." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/80677466159033548404.
Full textAbstract:
碩士國立清華大學
核子工程與科學研究所
101
This study presented an auxiliary system for the automatic power regulating system and operators of Lungmen nuclear power plant. The auxiliary system was design to predict and judge the plant state and to avoid improper operation. So the design system had two major functions: prediction and judgment. We used the adaptive neural fuzzy inference system to achieve the prediction function. Predicted targets are the reactor core pressure and steam flow rate of the next 5 minutes. We modularized the adaptive neural fuzzy inference system and proposed a hierarchical structures of the pressure prediction. To make the design system can judge the plant state, we used the fuzzy logic method. The output of judgment was the accept degree of the power demand. After the system was built, we used the Lungmen simulator, which is a full-scope dynamic simulator, as the test bench and the source of the training data. The auxiliary system was tested under the scenarios of the automatically increase power and the one reactor internal pump trip even. According to the result of the automatically increase power scenarios, the auxiliary system could avoid the turbine bypass value open even. Under the one reactor internal pump trip even, the input and output of the fuzzy logic could help operators to detect the abnormal state of the plant. The test result demonstrated that the design auxiliary system can make a reasonable prediction of the plant parameters in a very short time and can assist operators to improve plant safety and efficiency.
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Lu, Hsiu-Chih, and 盧信志. "Dynamic Behavior of the Power System for Petrochemical Plant." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/63966069978145883395.
Full textAbstract:
碩士國立高雄應用科技大學
電機工程系碩士班
94
This thesis presents the dynamic behavior of the power system for petrochemical plant. A simplified power system configuration was applied to this study. The models of the system components included steam turbine prime mover model, governor system model, excitation system model, synchronous generator model, three-phase power transformer model, and static load model. They were developed to cater for the dynamic behavior of the system using Simulink and SimPowerSystem. Various operational modes were simulated for the system, and the simulation results showed that the system operated acceptably under those conditions and should be coincident with practical operations. The dynamic behavior study for a petrochemical plant power system is essential for system planning, operation, and further expansion.
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Kuo-TaiHuang and 黃國泰. "Power System Operating Characteristics Analysis of a Steel Plant." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/x99j9g.
Full textAbstract:
碩士國立成功大學
電機工程學系碩士在職專班
102
In order to move toward the liberalization of the steel market, The production cost height is the market competition essential factor, because the electric power reliability greatly affects the plant production; therefore installment of the industrial cogeneration system has the economic cost benefit extremely. When Taiwan power system occurs fault how setting for both tie line tripping condition to achieved load shedding. To keep stability for the factory power supply system, will be the industrial cogeneration system extremely important topic. The aim of this thesis is to analysis the safety stable correlation technical questions of an industrial cogeneration system for China Steel Corporation, To analyze the operating situation of China Steel Corporation by the power system simulation program CYME. To review power flow analysis and short-circuit current calculation for both tie line tripping simulation for different system and generation conditions. form the simulation results, concluding remarks and recommendation on system operation are given. They are valuable for the authority to prepare the preventive strategies and corrective.
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Pan, Ching-Lung, and 潘慶龍. "Power System Analysis of Export Type Co-generation Plant." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/18605099582667592474.
Full textAbstract:
碩士長庚大學
電機工程研究所
89
This thesis analyzes the operation characteristics of an export type co-generation plant in order to satisfy system safety and rules specified by the utility of Taipower system. The analysis includes power flow, short circuit, and transient stability. The power flow calculation verifies that elements in the system are not overloaded and the operation limitations are not violated. The short circuit analysis identifies the fault currents on every bus are within the momentary withstanding level. The stability analysis evaluates responses of excitation system and transient stability of co-generation plant is acceptable. The above analyses can provide field personnel with useful information to enhance the overall operation reliability.
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Chen, Yeh-Cheng, and 陳彥誠. "Intelligent Radioactive Waste Process System for Nuclear Power Plant Decommissioning." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/a485d8.
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Ou, Ting-Chieh, and 歐定傑. "Analysis of Feedwater Control System for a Nuclear Power Plant." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/97326505592510090130.
Full textAbstract:
碩士國立高雄第一科技大學
系統資訊與控制研究所
97
The feedwater control system is a very important control system in the ChinShan nuclear power plant, whose main function is to regulate the reactor water level and to avoid the reactor trip due to the high/low water level. At the low power level, the feedwater control system uses the one-element control mode which acts the water level as the feedback signal only. Furthermore, it acts water level, feedwater flow and steam flow as the feedback signals to form the three-element control mode at the high power level. Because one-element control mode with the single feedback control loop design has low stability margin, the three-element control mode adds the rate feedback in the inner control loop to increase the stability margin when the reactor operates at the high power level. This study utilizes the root locus method of the conventional control analysis techniques to develop a new approach which is different with the vendor’s simulation approach to reevaluate the availability of the current ChinShan feedwater control system controller gain setpoint. Based on the analyzing result, all the current ChinShan controller gain setpoints get the reasonable explanation and their adjustable ranges. Therefore, the new approach will support the design, evaluation and validation of the feedwater control system in the other nuclear power plant and be a great benefit on them.
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陳光明. "Power System Harmonics Analysis and Research for a Steel Plant." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/03036242671441024414.
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LIN, GI-LIANG, and 林啟良. "The optimization of system reliability improvement for nuclear power plant." Thesis, 1987. http://ndltd.ncl.edu.tw/handle/20276085017146184081.
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Ko, Roung-Tsuen, and 柯榮村. "Effects of Large Power Plant on Transmission System Voltage Stability." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/82082252671393336189.
Full textAbstract:
碩士國立臺灣海洋大學
電機工程學系
96
The main objective of this thesis is to study the voltage stability characteristics of a multi-area power system in which a large power plant is to be committed into operation. By using the P-V curve analysis method, the maximum power transfer limits of the study system under normal operation and contingency conditions (N-1 and N-2) are obtained and from which the system voltage stability margins can be calculated. From the analyses performed on the study system, it is found that under both normal operation and contingency conditions, the voltage stability margins of the system with light load are higher than those of the system with peak load. The study results are useful for the practices of power system planning and operation.
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CHIEH, LIAO SHIH, and 廖士傑. "Design and Application of Distributed Control System of Power Plant." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/29631458648248577763.
Full textAbstract:
碩士大葉大學
資訊工程學系碩士在職專班
97
As the high industrialization and improved quality of people's lives, there has been an increasing demand of electric power. Since the rate of building new power plants cannot meet such a huge requirement, the shortage of electric power has become worse and worse. Therefore, the Ministry of Economic Affairs decided to promote the development of cogeneration system, and announced "the promotion of cogeneration systems regulation" in July 15, 1988. The regulation stated that all the extra power generated by registered companies could be bought back by the Taiwan Power Company. For encouragement purpose, the Taiwan Power Company was also obligated to provide the required power to those registered companies during periods of their machine maintenance. The control system of a cogeneration power plant consists of the main control unit and the auxiliary unit. The former is usually implemented by the distribution control system (DCS), while the latter is implemented by the programmable logic controller(PLC). The co-existence of such two different systems could lead to the communication and maintenance problems. This paper describes the development of a control system of a cogeneration power plant, which utilizes the DCS to control both the main control unit and the auxiliary unit. Such integration provides users with features of distributed control and centralized management for automatic control. In addition to reducing cost and time, our approach also allows the user to modify the control procedure with more flexibility and easy extension. With the help of such an integrated control system, the expenditure in human, material and financial resources of a company will be reduced. Keywords: cogeneration systems, distributed control system, programmable logic control .
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HUNG, WEN-CHIN, and 洪文慶. "Transient Stability Analysis in a Power System of Fossil Plant." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/04218765882998034915.
Full textAbstract:
碩士中原大學
電機工程研究所
95
Abstract In order to move toward the liberalization of petroleum market, the electric power quality has played an important role such that the refinery performance can be significantly increased. This also motivated the research of this thesis. This report summarizes the study results for the power system operation problems for Tao Yuan refinery of Chinese Petroleum Corporation”. The major contents and achievements include（1）device modeling, parameter check, and data file setup for all study cases,（2）power flow analysis, short-circuit current calculation,system stability simulation for different system load and generation conditions. Form the study results,concluding remarks and recommendations on system operation and planning are given. They are valuable for the authority to prepare the preventive strategies and corrective actions. Key Words：Power flow, Fault current, Transient stability.