Artykuły w czasopismach: „Power transmission line performance”

1

Li, Feng Xia, i Yue Long Wang. "Based on the TLM Method 1000kV UHV Transmission Line Performance Analysis". Advanced Materials Research 383-390 (listopad 2011): 2917–22. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.2917.

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The TLM model of 3 - phase pow er t ran sm ission line is developed. Appling the transmission line modeling (TLM) method to analysis 1000kV ultrahigh voltage( UHV) AC transmission line, the obtained results prove that it is economical and reasonable to transmit the natural power by power transmission, and the transmission lines is a long-distance transmission power ; but both the super power and the power transmission, the transmission power reduce with the increase of transmission distance.

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Duche, Dipashree Navanath. "Power Line Communication Performance Channel Characteristics". Computer Engineering and Applications Journal 3, nr 1 (6.02.2014): 34–42. http://dx.doi.org/10.18495/comengapp.v3i1.42.

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Power lines form the medium of transmission in PLC systems. The original purpose of these lines is the transportation of electric signals at 50 or 60 Hz .This paper proposes a new channel modeling method for power line communications networks based on the multipath profile in the time domain. The new channel model is developed to be applied in a range of Power line Communications (PLC) research topics such as impulse noise modeling, deployment and coverage studies, and communications theory analysis. The statistical multipath parameters such as path arrival time, magnitude and interval for each category are analyzed to build the model. Each generated channel based on the proposed Power line communication that a performance channel characteristic represents a different realization of a PLC network

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Rafea M. Abd El-Maksoud, Rafea M. Abd El-Maksoud. "Advanced Power Transmission System". journal of King Abdulaziz University Engineering Sciences 23, nr 2 (22.02.2012): 191–207. http://dx.doi.org/10.4197/eng.23-2.10.

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Different researches are adopted to modify and enhance automatic transmission by every means. Whereas, torque converter that represents the most important component in such transmission suffers from some problems that are not completely solved. In this paper, power transmission system is herein introduced as a unique power transmission system that is not affected by torque converter problems. This power transmission operates with power splitting concept and is composed of conventional torque converter connected to planetary sets. Three clutches are used to shift the operating modes and unique positive displacement hydraulic couplings are utilized to regulate performance in power paths. Also, a modified model used to predict torque converter performance is utilized with planetary gear kinetics to assess the transmission performance. Moreover, the present system operates with high performance. Unlike the automatic transmission that operates in line, the present system operates with infinity number of operational bands for each engine speed.

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Digioia, A. M., i L. F. Rojas-Gonzalez. "Rock socket transmission line foundation performance". IEEE Transactions on Power Delivery 9, nr 3 (lipiec 1994): 1570–76. http://dx.doi.org/10.1109/61.311208.

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Li, Fang Yuan, Hui Xia Ding i He Lang. "Power OTN Communications Transmission Performance Simulation Calculation". Applied Mechanics and Materials 543-547 (marzec 2014): 2488–91. http://dx.doi.org/10.4028/www.scientific.net/amm.543-547.2488.

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This paper briefly introduced the main linear damages in the network layer of electric power Optical Transmission Network which contains fiber loss, chromatic dispersion and polarization mode dispersion. Based on the engineering practice in the application of power system, this paper studied the loss in the optical fiber cable line. The paper also studied chromatic dispersion and polarization mode dispersion. The calculation models were concluded and used for simulation verification. Each model can be used to power OTN engineering design.

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Yang, Ming Bo, Zi Ze Liang, En Li, Kai Liang Zhang i Guo Dong Yang. "Induction Power Supply System for Power Transmission Line Inspection Robot". Advanced Materials Research 462 (luty 2012): 860–65. http://dx.doi.org/10.4028/www.scientific.net/amr.462.860.

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In order to prolong continuous working time of one transmission line inspection robot, a power supply system with induction charging unit for this inspection robot is introduced in this paper. Special current transformer by which the robot could get power from power line is designed according to the magnetic field condition around the transmission line. Besides, charging circuit for Li-battery pack is also introduced. A fly-back circuit is applied in the circuit to provide precisely accessible input power for charging battery packs. Experimental results show that the power supply system could have good performance on extending the continuous working period of the transmission line inspection robot.

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Gandotra, Rupika, Kanika i Kirti Pal. "The VSC-HVDC Transmission System Performance Assessment". Journal of Physics: Conference Series 2570, nr 1 (1.08.2023): 012025. http://dx.doi.org/10.1088/1742-6596/2570/1/012025.

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Abstract As the use of renewable resources increases the transfer of power from remote area to consumer is a big challenge. Therefore, Voltage Source Converter High Voltage Direct Current (VSC-HVDC) transmission is gaining more popularity for integration of renewable energy generators to the consumers using smart grid. Even after many advantages of HVDC transmission system it is not used popularly due to unexpected instability in the system. However recent developments in semiconductor devices and control techniques the HVDC link operation in transmission system becomes easier. In this paper VSC based HVDC system is designed with AC-DC converter model for power flow assessment of both sides of HVDC link. To analyze the proposed model a simulation model of 75km DC line with voltage source converter (VSC) based AC-DC converter model on both side of DC line is designed in a MATLAB environment. HVDC link efficiency is calculated by analyzing power flow through AC lines at both ends of HVDC line.

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Karuppiah, N., S. Muthubalaji, S. Ravivarman, Md Asif i Abhishek Mandal. "Enhancing the performance of Transmission Lines by FACTS Devices using GSA and BFOA Algorithms". International Journal of Engineering & Technology 7, nr 4.6 (25.09.2018): 203. http://dx.doi.org/10.14419/ijet.v7i4.6.20463.

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Flexible Alternating Current Transmission System devices have numerous applications in electrical transmission lines like improvement of voltage stability, reactive power compensation, congestion management, Available Transfer Capacity enhancement, real power loss reduction, voltage profile improvement and much more. The effectiveness of these FACTS devices is enhanced by the placement of these devices in the transmission lines. The placement is based on transmission line sensitivity factors such as Bus voltage stability index and line voltage stability index. This research article focuses on optimizing the location, number and ratings of FACTS devices using Evolutionary Algorithms like Bacterial Foraging Algorithm and Gravitational search algorithm. FACTS devices such as Static Var Compensator, Thyristor Controlled Series Capacitor and Unified Power Flow Controller are placed on IEEE 14 bus and IEEE 30 bus systems for reducing the real power loss in the transmission system. The results show that the performance of the transmission lines is enhanced more using Bacterial Foraging Algorithm than Gravitational Search Algorithm.

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Hlaing, Ya Min Su, i Ze Ya Aung. "Performance Analysis on Transmission Line for Improvement of Load Flow". Advanced Materials Research 433-440 (styczeń 2012): 7208–12. http://dx.doi.org/10.4028/www.scientific.net/amr.433-440.7208.

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This thesis implements power flow application, Newton-Raphson method. The Newton-Raphson method is mainly employed in the solution of power flow problems. The network of Myanma electric power system is used as the reference case. The system network contains 90 buses and 106 brunches. The weak points are found in the network by using Newton-Raphson method. Bus 16, 17, 85 and 86 have the most weak bus voltages. The medium transmission line between bus 87 and bus 17 is compensated by using MATLAB program software. The transmission line is compensated with shunt reactors, series and shunt capacitors to improve transient and steady-state stability, more economical loading, and minimum voltage dip on load buses and to supply the requisite reactive power to maintain the receiving end voltage at a satisfactory level. The system performance is tested under steady-state condition. This paper investigates and improves the steady–state operation of Myanma Power System Network.

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Moss, P. L., J. P. Zheng, G. Au, P. J. Cygan i E. J. Plichta. "Transmission Line Model for Describing Power Performance of Electrochemical Capacitors". Journal of The Electrochemical Society 154, nr 11 (2007): A1020. http://dx.doi.org/10.1149/1.2778126.

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Li, Yong Shuang, Qiu Feng Shang i Xue Mei Li. "Research on Cooperative Relay Transmission in Power Line Communication". Advanced Materials Research 659 (styczeń 2013): 79–82. http://dx.doi.org/10.4028/www.scientific.net/amr.659.79.

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In this paper, cooperative relay transmission in power line communication system is investigated. It is considered that channels between users and relays are disturbed by PLC noise. The half-duplex AF relaying model is used to measure the performance for the PLC system. The system performance under cooperative relaying is analyzed and compared. The PLC channel is considered as Middleton’s Class A noise model.

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Saraswathi, Ananthavel, i S. Sutha. "Investigation of Modified Generalized Interline Power Flow Controller (GIPFC) and Performance Analysis". Applied Mechanics and Materials 622 (sierpień 2014): 111–20. http://dx.doi.org/10.4028/www.scientific.net/amm.622.111.

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Nowadays in the restructured scenario, the main challenging objective of the modern power system is to avoid blackouts and provide uninterrupted quality power supply with dynamic response during emergency to improve power system security and stability. In this sense the convertible static compensator (CSC) that is the Generalized Inter line power flow controller (GIPFC), can control and optimize power flow in multi-line transmission system instead of controlling single line like its forerunner FACTS (Flexible AC Transmission System) controller. By adding a STATCOM (Static synchronous Shunt Converter) at the front end of the test power system and connecting to the common DC link of the IPFC, it is possible to bring the power factor to higher level and harmonics to the lower level and this arrangement is popularly known as Generalized Inter line power flow controller (GIPFC). In this paper a new concept of GIPFC based on incorporating a voltage source converter with zero sequence injection SPWM technique is presented for reinforcement of system stability margin. A detailed circuit model of modified GIPFC is developed and its performance is validated for a standard test system. Simulation is done using MATLAB Simulink.Index Terms—Convertible static controller, Flexible AC Transmission System (FACTS), Generalized Interline Power Flow Controller (GIPFC),STATCOM, SSSC, Reactive power compensation.

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H. Rawa, Muhyaddin J. "Characteristic and Surge Impedance Variation Impact on Transmission Line Performance". International Journal of Electrical and Computer Engineering (IJECE) 8, nr 4 (1.08.2018): 2602. http://dx.doi.org/10.11591/ijece.v8i4.pp2602-2607.

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Modeling of power systems is essential to perform various network analyses. Voltage regulation, line losses and transmission line efficiency are greatly affected by transmission line parameters. Hence, accurate modeling of transmission line is required. The aim of this paper is to study the impact of characteristic and surge impedances on voltage profile, voltage regulation and transmission line efficiency.

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Sh. Wais, Dunya, i Wafaa S. Majeed. "PERFORMANCE OF HIGH VOLTAGE TRANSMISSION LINE BASED ON THYRISTOR-CONTROL SERIES COMPENSATOR". Journal of Engineering and Sustainable Development 25, nr 5 (1.05.2021): 26–38. http://dx.doi.org/10.31272/jeasd.25.5.3.

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This research aims to improve the steady-state performance of high-voltage power transmission lines, which is a significant challenge for the power system grid's safe and reliable operation. The research adopted Flexible Alternating Current Transmission System for electronic devices. The flexible alternating current transmission system technology will be used in this specific work as Thyristor-Controlled Series Compensators. Thyristor-controlled series compensator devices increase transmission systems' capacity and enhance the voltage profile by regulating transmission line reactance. Gravitational Search Algorithm is a meta-heuristic approach applied to find the optimum size and optimal location of thyristor-controlled series compensators in power systems. The gravitational search algorithm is used to solve the multi-objective and integrated optimum power flow problem in reactive energy management during normal and contingency operations. The results showed reduced voltage deviation, reduced active/reactive power losses, and increased transmission line reserves above thermal limits, in addition to reducing the installed cost and number of thyristor series compensators devices. The simulation part was created with MATLAB programming language and validated with MATPOWER software. Applied to IEEE 30 bus system and 400kV super high voltage grid system.

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Jorge Luiz De Franco i José Pissolato Filho. "Improvement of the transmission and sub-transmission overhead lines lightning performance using line arresters – Experience in Brazil". Journal of Energy - Energija 60, nr 1-4 (22.08.2022): 61–68. http://dx.doi.org/10.37798/2011601-4263.

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Lightning has been reported as the major cause of non-scheduled outages that occur in Brazilian’s power system, being responsible for approximately 50 – 70% of the outages verified in overhead lines with rated voltages up to 230 kV and creating many issues for power supply utilities and consumers. In agreement with the information of the National Institute for Space Researche (INPE) Brazil is the country with the largest incidence of lightning activities in the world, with about 50 - 70 million lightning outages a year somewhere in the country. With this considerable amount of lightning caused distubances, the resulting damages caused to the electric power systems are high such that the costs of losses and repairs exceed an annual value of 350 million dollars. This fact has been taken up by several power supply utilities and industrial consumers and caused them to invest in partnership with universities and research centers in the development of theoretical studies and the promotion of improvements along the critical sections of their overhead lines with poor lightning performance, thereby increasing their reliability. In many cases line arresters have been considered as the most effective method to improve the lightning performance. In Brazil, the first application of line arresters was in the middle of the nineties and from this time on more than 3,000 units of gapless line arresters were installed on overhead lines from 34.5 kV up to 230 kV. The analysis and evaluation of overhead lines lightning performance before and after the line arresters installation have shown a good effectiveness, with average indexes for the improvement higher than 70%. Good field experience and the proven results obtained in the the overhead lines lightning performance after the line arresters installation have been encouraging more and more Brazilian power supply utilities and industrial consumers to develop studies to evaluate the line arresters application along their overhead lines presenting poorer lightning performance. This paper presents information about the experience of the Brazilian power supply utilities as well as industrial consumers in the application of line arresters to improve the overhead lines lightning performance. Procedures used to optimize the characteristics of the line arresters, quantity and location along the critical sections of the lines; field experience as well as the lightning performance of the lines before and after the line arresters application are presented and discussed.

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Bharti, Satyadharma, i Satya P. Dubey. "Design and Analysis of TCSC Performance for 1200 kV UHVAC Transmission System". Recent Advances in Electrical & Electronic Engineering (Formerly Recent Patents on Electrical & Electronic Engineering) 13, nr 4 (5.07.2020): 546–58. http://dx.doi.org/10.2174/2352096512666190422162108.

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Background: Technical feasibility of Ultra High Voltage (UHV) Transmission system is proven through many UHV projects worldwide and research is going on to make it commercially viable. The rapid development of Power Electronics in the field of UHV AC power system has resulted in the economic and efficient transmission of bulk power over long distances. Methods: In order to improve the voltage profile of the transmission system, power transfer capability, transient and dynamic stability; Flexible AC Transmission System (FACTS) devices have been introduced at UHV level. The present paper focuses on the design and evaluation of TCSC system for the Indian UHVAC system for its Wardha Aurangabad Line, which is at present operating at 400 kV but will be upgraded soon to 1200 kV. A flow chart is prepared for the determination of the values of TCSC inductor and capacitor. Result: PSCAD/ EMTDC Software-Simulation based study is carried out to analyze the behavior of the UHV transmission line with TCSC. The effect of improvement in power transfer capability, with and without the use of TCSC scheme; through Constant- Current mode, closed-loop control has been investigated for a healthy line and a faulty line. Conclusion: With the use of TCSC, an increase of 52% is observed in the power transfer capability of the line, which is raised from about 5000 MW to 7777 MW. The paper will prove a milestone for academicians, researchers, and design engineers in the field of Power Electronics and Power Systems.

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Ashida Salim, Nur, Hasmaini Mohamad, Zuhaila Mat Yasin, Nur Fadilah Ab Aziz i Nur Azzammudin Rahmat. "Graphical user interface based model for transmission line performance implementation in power system". Indonesian Journal of Electrical Engineering and Computer Science 16, nr 1 (1.10.2019): 92. http://dx.doi.org/10.11591/ijeecs.v16.i1.pp92-100.

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Transmission line is one of the important elements in the process of power transfer from the source of generation to the consumer. In order to analyze the performance of a transmission line, it has to be represented by an equivalent model with suitable circuit parameters at a per phase basis. The line models are used to measure voltages, currents and the amount of power flow depending on the line length. Transmission line performance is determined by the voltage regulation and its efficiency under their normal operating conditions. In this study, a systematic approach was developed in order to assists the lecturers in teaching this important topic to the students despite so many complicated mathematical equations involved in the calculation. With the aid of Graphical User Interface (GUI), the performance of transmission line can be determined and monitored due to the change of line parameters. The results obtained could assist the lecturers in delivering the concept of engineering in a more systematic approach. On top of that, it could also assist the power system utility in planning the transmission line that needed to be installed in the system.

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Zhang, Jun, Kuan Jun Zhu, Zhen Liu, Jia Jun Si i Hai Jun Niu. "Vacuum Zincification Technical Study of Fitting Material in Power Transmission Line". Advanced Materials Research 803 (wrzesień 2013): 268–73. http://dx.doi.org/10.4028/www.scientific.net/amr.803.268.

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Fittings of the power transmission line are requested to have good anti-corrosion performance when they are use at atmosphere environment. The fittings of the power line have certain mutual movement during application process, which mutually produce friction. In particular to the fittings of the power line which are applied in the area and environment with strong wind sand such as western area, wind sand will produce corrosion wear of the fittings in the line. Therefore the fittings of the power line are requested to have good anti-abrasion and corrosion resistant comprehensive performance. In combination with application environment of the power fittings and characteristics of vacuum zincification technology, carry out analysis on possibility of application of vacuum zincification in the fittings in the power line from performance requirements, fitting materials, geometrical features of the fittings, economy of vacuum zincification etc several aspects.

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Asmare, Lijalem Dires, Belachew Bantyirga Gessesse i Elias Mandefro Getie. "Techno-Economic Comparisons of HVAC and Simultaneous AC-DC Transmission". Journal of Electrical and Computer Engineering 2022 (17.01.2022): 1–12. http://dx.doi.org/10.1155/2022/4571596.

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Electric power consumption has been increasing rapidly across the globe; this increase specially accelerated in the last decade. Consequently, existing transmission lines are becoming overloaded beyond their power transfer capability. The inadequacy of the transmission lines has contributed to power interruptions and instability of the power system. Construction of new transmission lines can be a solution to mitigate these problems. However, to build the whole structure of a new transmission line, a huge investment is required. Besides this, environmental concerns would create further barriers that delay the accomplishment of the project. Therefore, the effective and quickest solution to tackle this problem is enhancing the power transfer capability and stability margin of existing transmission lines. This paper studied the techno-economic feasibility of converting an existing HVAC line into a simultaneous AC-DC power transmission system to enhance power transfer capability as well as to improve power system stability. Using the proposed method, the loadability of Tana Beles to Addis Ababa 400 kV, 476.2 km AC line has increased to more than double which is from 1091.66 MW to 2196.85 MW. The active power loss and corona loss evaluation of the two systems ensured that simultaneous AC-DC system is more efficient than HVAC system. It is also shown that the instability can be effectively improved by simultaneous AC-DC power transmission with fast DC power modulation. From the economic point of view, rather than constructing new HVAC line, converting existing HVAC line into simultaneous AC-DC transmission system has a price reduction of about 107,984,968.56 USD or 32.46% of the new HVAC line cost. Considering a 35-year project life cost analysis, it is observed that the life cycle cost of the simultaneous AC-DC transmission system is about 29.2% lower than the life cycle cost of a new 400 kV HVAC line. Thus, the designed simultaneous AC-DC power transmission system has better technical performance and also is less costly than constructing a new HVAC line.

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Fahmi Hakim, Muhammad, Ahmad Hermawan, Imron Ridzki, Sigit Setya Wiwaha i Gadis Azizah Nurjannah Hamka Putri. "T-junction Configuration Performance in aTransmission Sub-system". International Journal of Frontier Technology and Engineering 1, nr 01 (1.12.2022): 21–32. http://dx.doi.org/10.33795/ijfte.v1i01.291.

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A cement factory, namely PT Semen Imasco Asiatic, requires a large supply of power for production. However, in the area where the cement factory was established, namely Puger District, there was no electricity capable of supplying it, so PLN built the Puger substation. In the original plan, the transmission line will be built directly from GI Tanggul to GI Puger. However, because the plant must operate immediately, the electricity supply is taken from the existing Tanggul substation-Jember substation transmission line using the T-Junction configuration. In this paper, an analysis of the power flow of the Paiton-Grati subsystem will be carried out when the power supply from Tanggul Substation to Puger Substation is passed through the T-Junction configuration or when the transmission line is connected from the Tanggul Substation to the Puger Substation directly. The result of this research is that there is no significant difference between the two conditions in power losses, voltage drop, current, and power factor parameter so that the T-Junction configuration is quite feasible to use even though it is temporary.

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D'Amore, M., i M. S. Sarto. "Digital transmission performance of carrier channels on distribution power line networks". IEEE Transactions on Power Delivery 12, nr 2 (kwiecień 1997): 616–23. http://dx.doi.org/10.1109/61.584330.

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Kawady, Tamer A., Abdel-Maksoud I. Taalab i Eman S. Ahmed. "Dynamic performance of the power differential relay for transmission line protection". International Journal of Electrical Power & Energy Systems 32, nr 5 (czerwiec 2010): 390–97. http://dx.doi.org/10.1016/j.ijepes.2009.11.004.

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Poun Raj, K., V. Raja Sekaren, S. Selvaperumal i N. Mageswari. "Performance Investigation of D-Q Model for PI and Fuzzy Controller Based UPFC". Applied Mechanics and Materials 573 (czerwiec 2014): 310–16. http://dx.doi.org/10.4028/www.scientific.net/amm.573.310.

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– The unified power flow controller (UPFC) is the most versatile and complex power electronic equipment that has emerged as the indispensable equipment for the control and optimization of power flow in electrical power transmission system. In this manuscript is investigated the control of real and reactive power flow through a transmission line with the use of UPFC at the sending end. Computer simulation using MATLAB Simulink is done and the behavior of the UPFC is studied. In the UPFC based control of transmission line parameter control systems, it is observed that whenever the SSSC sources some real power into the transmission line it is manifested as a voltage drop across the DC link. Reactive power demand is indicated as fall in the bus bar AC voltage. The fall of the DC link voltage is an indication of real power demand from the receiving end. Similarly a fall of the bus bar AC voltage is an indication of reactive power demand from the receiving end. Fuzzy Logic and PI controllers are used in this works, the control of DC voltage, AC voltage and power transfer.

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Niu, Hai Jun, Jun Zhang, Jia Jun Si i Zhen Liu. "Low Temperature Resistant Material Study of Fitting in Power Transmission Line". Advanced Materials Research 803 (wrzesień 2013): 247–52. http://dx.doi.org/10.4028/www.scientific.net/amr.803.247.

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Establishing large coal fired power, hydropower and wind power bases in the energy resources centre and large capacity long distance power energy transmission are main way to solve resource contradiction according to distribution characteristic of energy resource in our country. Power transmission line shall avoid influence of high altitude and low temperature etc environments in long distance power transmission, such as western area, the steel material of the fitting in the line with low temperature requirement shall have good low temperature resistant brittle, therefore the fittings in the power line are requested to have good low temperature resistant comprehensive performance. In combination with application environment of the power fittings and characteristics of metal material, carry out analysis on possibility of application of the low temperature resistant material in the fittings in the power line from performance requirements, fitting materials, geometrical features of the fittings, test characteristics of the fitting etc.

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Costa, Tito Ricardo Vaz da, Ailton Teixeira do Vale i Clarissa Melo Lima. "Impact of the specific fire load on the performance of power transmission lines". Ciência Florestal 33, nr 1 (28.03.2023): e64029. http://dx.doi.org/10.5902/1980509864029.

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Transmission line outages caused by fires are frequent and affect the electric power supply to the population. Studying the factors that may aid in the understanding of this problem is fundamental to improve performance and guide future projects involving this type of installation. This study analyzed the forest inventories of vegetation adjacent to three Brazilian transmission line trunks and calculated their specific fire loads. The results were compared with the performance of these installations and revealed a high correlation (R2=0.9877) between the fire load and the number of transmission line outages, demonstrating the influence of vegetation on the operation of these installations.

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bin Salim, Norhafiz. "Optimal Location of UPFC with ATC Calculation". Applied Mechanics and Materials 313-314 (marzec 2013): 896–900. http://dx.doi.org/10.4028/www.scientific.net/amm.313-314.896.

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Flexible AC Transmission System (FACTS) devices namely Unified Power Flow Controller (UPFC) will gives a basic control for transmission line real/reactive power flow and bus voltage/shunt reactive power. UPFC helps in regulating the power and mitigating the rotor speed instability and damping oscillations. UPFC placement was conducted at each line in the entire network system to obtain the most suitable optimum location for most effectiveness performance. The performance of the optimal UPFC location is checked by applying a fault across a transmission line to which UPFC is connected and the power flow in the line and stability of the system is determined. Available Transfer Capability values indicate allowable highest magnitude of active power (MW) that can be transferred from the source to the sink over and above the already committed uses (base case) of the whole network without exceeding any line thermal loading and bus voltage limits. Finally, simulations were carried out using PSAT software to validate the performance of the UPFC which connected to a transmission line. The effectiveness for UPFC is demonstrated on IEEE 9 bus and IEEE 24 bus system while for ATC is demonstrated on IEEE 6 bus system and all the results are compared.

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Sahu, Pankaj Kumar. "Performance Analysis of Different Tie-Line for Synchronization of 12-Area Two Interconnected Thermal Power Grid". Asian Journal of Electrical Sciences 6, nr 2 (5.11.2017): 37–50. http://dx.doi.org/10.51983/ajes-2017.6.2.1997.

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This paper represents the advantages of HVAC-HVDC parallel tie-line as compare to the Flexible AC Transmission System (FACTS) tie-line and normal HVAC tie-line for synchronization of 12-area two interconnected thermal power grid with its all 12 areas when load changed in power grid-1 (area-6). After load change in power grid-1 (area-6), 12-area two interconnected thermal power grid with its all 12 areas are synchronized at the same time only in case of HVAC-HVDC parallel tie-line. This paper also shows the Flexible AC Transmission System (FACTS) tie-line is better as compare to the normal HVAC tie-line. Performance analysis of different tie-line for synchronization or load (machine) frequency control of 12-area two interconnected thermal power grid is done in terms of settling time of frequency deviation of all 12 areas and settling time of tie-line power deviation of two interconnected areas or two interconnected power grid by using conventional integral controller when load changed in power grid-1 (area-6).

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Brandl, Martin, i Karlheinz Kellner. "Performance Evaluation of Power-Line Communication Systems for LIN-Bus Based Data Transmission". Electronics 10, nr 1 (4.01.2021): 85. http://dx.doi.org/10.3390/electronics10010085.

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Powerline communication (PLC) is a versatile method that uses existing infrastructure such as power cables for data transmission. This makes PLC an alternative and cost-effective technology for the transmission of sensor and actuator data by making dual use of the power line and avoiding the need for other communication solutions; such as wireless radio frequency communication. A PLC modem using DSSS (direct sequence spread spectrum) for reliable LIN-bus based data transmission has been developed for automotive applications. Due to the almost complete system implementation in a low power microcontroller; the component cost could be radically reduced which is a necessary requirement for automotive applications. For performance evaluation the DSSS modem was compared to two commercial PLC systems. The DSSS and one of the commercial PLC systems were designed as a direct conversion receiver; the other commercial module uses a superheterodyne architecture. The performance of the systems was tested under the influence of narrowband interference and additive Gaussian noise added to the transmission channel. It was found that the performance of the DSSS modem against singleton interference is better than that of commercial PLC transceivers by at least the processing gain. The performance of the DSSS modem was at least 6 dB better than the other modules tested under the influence of the additive white Gaussian noise on the transmission channel at data rates of 19.2 kB/s.

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Gartzke, Eva, Dieter Götsch, Roman Karmazin, Ruth Männer, Richard Matz i Jens Müller. "Design of Compact Transmission Line Transformers in LTCC Technology". Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2012, CICMT (1.09.2012): 000442–46. http://dx.doi.org/10.4071/cicmt-2012-wa418.

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Concepts for ceramic integrated transmission line transformers (TLT) to conduct powers up to some kW and currents up to 10 A with an impedance ratio of 4:1 are presented. In this power range, a TLT usually consists of coaxial cables. To optimize size, improve integrability and enhance electric performance, our work pursues the integration into a planar multilayer board with electroplated conductors using Low Temperature Cofired Ceramics Technology (LTCC). The methodical design approach is presented, using complementary simulation tools for circuit, multilayer and FEM analysis to reach the aforementioned application-specific performance. Size is reduced further using specific ferrites and optimizing their position. The correlation between measured characteristics of various transmission line transformers produced and underlying design considerations are given in detail. Minimum sizes of 10 to 15 mm squared have been realized using single sided metallisation, which is also well suited for electroplating.

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Yang, Lin, Kai Quan Xia, Fan Liu, Xi Chun Ren i Yuan Shi Deng. "Atmospheric Corrosion Study on High-Voltage Overhead Power Transmission Line". Applied Mechanics and Materials 291-294 (luty 2013): 2313–16. http://dx.doi.org/10.4028/www.scientific.net/amm.291-294.2313.

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Influence of atmosphere corrosion on conductor in the high-voltage overhead power transmission line has been paid more and more attention. This paper carries out experimental test research on atmosphere corrosion forms of aged conductor wires through metallographic analysis, electron microscope scanning etc. technologies, analyzing the influence of corrosion on its mechanical performance, which has provided theoretical reference for operation and maintenance of the overhead power transmission line.

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Chaudhari, Hitesh R. "Solar Powered DC Micro Grid for Transmission Line". International Journal for Research in Applied Science and Engineering Technology 11, nr 5 (31.05.2023): 7541–47. http://dx.doi.org/10.22214/ijraset.2023.53438.

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Abstract: The increasing demand for sustainable and renewable energy solutions has prompted the exploration of solar power as a viable alternative to traditional fossil fuel-based energy sources. To efficiently transmit and distribute solar power, the integration of direct current (DC) transmission systems has gained attention due to their inherent advantages, such as lower losses and improved efficiency. However, the widespread adoption of solar-powered DC microgrids for transmission remains limited. This research paper aims to address this gap by investigating the feasibility and viability of a solar-powered DC microgrid for transmission. The research begins with a comprehensive review of existing power transmission systems, highlighting the advantages and limitations of DC microgrids and previous studies on solar-powered microgrids. By analysing the existing challenges and gaps in the literature, this study identifies the need for a thorough evaluation of the performance and effectiveness of solar-powered DC microgrids.

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Dalgarno, Kenneth W. "Power Transmission Belt Performance and Failure". Rubber Chemistry and Technology 71, nr 3 (1.07.1998): 619–36. http://dx.doi.org/10.5254/1.3538494.

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Abstract The performance and life of power transmission belts has been investigated by a number of research groups over the past decade or so. Most studies have been directed at a particular problem with or application of belting technology, with synchronous and V-ribbed belts generating the most research activity. This paper reviews contemporary studies on the performance and failure of synchronous and V-ribbed belts to develop an overall picture of how the understanding of belt materials, mechanics, and failure mechanisms has progressed in recent years. The studies which have moved the understanding of belt behavior furthest forward have been those which sought, through an improved understanding of how a belt acts as a composite, to integrate the various strands of materials, mechanics and failure analysis knowledge available to give a clear and coherent picture of how a belt works and fails, although none of the studies seen so far can claim to have accomplished this completely.

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Xu, Qingwen, Hengxu Zhang, Yongji Cao, Hao Qin i Zhimin Gao. "Power System State Estimation Approach Considering Transmission Line Temperature". Applied Sciences 12, nr 19 (10.10.2022): 10171. http://dx.doi.org/10.3390/app121910171.

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The transmission line parameters vary with the change of temperature, which has a significant impact on power system state estimation (SE). Based on the theory of electro-thermal coordination (ETC), this paper proposes two ETC-SE approaches with the consideration of transmission line temperature. The heat balance equation (HBE) is combined with the conventional weighted least square SE for establishing an ETC-SE model. Moreover, an augmented Jacobian ETC-SE approach is developed by integrating the HBE into pseudo measurements and the line temperature into state vectors. The Jacobian matrix is augmented correspondingly and the partial differential coefficients of measurements to line temperature are provided, which enables to calculate line temperature and voltage phasors simultaneously. Furthermore, in order to accelerate the solving process, an improved two-step ETC-SE algorithm is proposed, in which the SE and temperature estimation are decoupled and solved via alternate iteration. The effectiveness of the proposed ETC-SE approaches is verified by the IEEE 14-, 39-, and 118-bus systems. The results show that the proposed ETC-SE approach is effective to reduce the calculation errors and possesses good convergence performance with varying environmental circumstances and ill-conditioned branches.

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Ali, Ali Abdullah, Ahmed N. Abdalla i R. Ishat. "EFFECT of DG Optimizing on overload Transmission line Stability". MATEC Web of Conferences 225 (2018): 03023. http://dx.doi.org/10.1051/matecconf/201822503023.

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Typical steady state studies always treat the peak power demands as the worst case conditions. Periods of light load are also critical in the assessment of the possible state of a power system. While heavy load conditions are generally associated with overload, low voltage and generation deficiency, light load conditions may give rise to over-voltage and undesirable reactive power requirements at generation side. This paper focus on study the effect of DG Optimizing on overload Transmission line Stability. The system dispatch constraints should be taken into account to compensate or varying DG generation output and to enhance the operational performance of power systems. This dispatching operation depends on the change of DG generation and the dispatching strategy. The impact of DG generation uncertainty is limited with the generation dispatching operation and should not be neglected in system analysis.

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Li, Guo Sheng. "Power Line Carrier Communication Meter Concentrator Hardware Design". Advanced Materials Research 971-973 (czerwiec 2014): 1688–91. http://dx.doi.org/10.4028/www.scientific.net/amr.971-973.1688.

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This paper analyzes the characteristics of a high-frequency signal transmission power lines ; focused on the spread spectrum communication technology in power line carrier communication ; -depth study of the spread spectrum modulation and demodulation techniques in communication technology-based , high-performance power line carrier dedicated MODEM chip SSC P300 internal works. Focuses on the design of the concentrator hardware systems.

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Bottiglione, Francesco, Giacomo Mantriota i Marco Valle. "Power-Split Hydrostatic Transmissions for Wind Energy Systems". Energies 11, nr 12 (1.12.2018): 3369. http://dx.doi.org/10.3390/en11123369.

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In a wind turbine, if a continuously variable transmission is placed between the turbine rotor and the generator, the speed ratio can be tuned to match the variable rotor speed to the constant speed of the electric generator, thus eliminating the need to adapt the frequency to the grid. In this paper, power-split hydrostatic transmission (PS-HTS) architecture is proposed as a suitable continuously variable transmission for application to wind turbine systems. The performance of PS-HTS is modelled and compared with that of previously proposed architectures in which the hydrostatic transmission is placed in-line with traditional drives (in-line HTS). It is shown here that the PS-HTS can improve the annual energy production of a 250 kW rated power wind turbine of about 10–11% by employing a hydrostatic transmission with one-seventh the size of the one requested by in-line HTS architecture.

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Alsammak, Ahmed Nasser, i Hasan Adnan Mohammed. "Power quality improvement using fuzzy logic controller based unified power flow controller". Indonesian Journal of Electrical Engineering and Computer Science 21, nr 1 (1.01.2021): 1. http://dx.doi.org/10.11591/ijeecs.v21.i1.pp1-9.

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The Power quality of the electrical system is an important issue for industrial, commercial, and housing uses. An increasing request for high quality electrical power and an increasing number of distorting loads had led to increase the consideration of power quality by customers and utilities. The development and use of flexible alternating current transmission system (FACTs) controllers in power transmission systems had led to many applications of these controllers. A unified power flow controller (UPFC) is one of the FACTs elements which is used to control both active and reactive power flow of the transmission line. This paper tried to improve power quality using a fuzzy logic controller (FLC) based UPFC, where it used to control both active and reactive power flow, decreas the total harmonic distortion (THD), correct power factor, regulate line voltage and enhance transient stability. A comparison study of the performance between the system with a conventional PID controller and FLC has been done. The theoretical analysis has been proved by implementing the system using MATLAB/SIMULINK package.The Power quality of the electrical system is an important issue for industrial, commercial, and housing uses. An increasing request for high quality electrical power and an increasing number of distorting loads had led to increase the consideration of power quality by customers and utilities. The development and use of flexible alternating current transmission system (FACTs) controllers in power transmission systems had led to many applications of these controllers. A unified power flow controller (UPFC) is one of the FACTs elements which is used to control both active and reactive power flow of the transmission line. This paper tried to improve power quality using a fuzzy logic controller (FLC) based UPFC, where it used to control both active and reactive power flow, decreas the total harmonic distortion (THD), correct power factor, regulate line voltage and enhance transient stability. A comparison study of the performance between the system with a conventional PID controller and FLC has been done. The theoretical analysis has been proved by implementing the system using MATLAB/SIMULINK package.

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Azriyenni, Azriyenni, i Mohd Wazir Mustafa. "Application of ANFIS for Distance Relay Protection in Transmission Line". International Journal of Electrical and Computer Engineering (IJECE) 5, nr 6 (1.12.2015): 1311. http://dx.doi.org/10.11591/ijece.v5i6.pp1311-1318.

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The techniques hybrid intelligent was introduced in transmission protection that usage in electric power systems. There was applied ANFIS for distance relay protection particularly for transmission line. If a fault occurs during the transmission line identification caused by unwanted fault thus the power delivery to the consumer becomes not going well. Therefore, it would need to provide an alternative solution to fix this problem. The objective of this paper uses impedance transmission line to determine how long the channel spacing will be protected by distance relay. It has been distance relays when fault occurs in transmission line with the application Sugeno ANFIS. The simulation shows it excellent testing results can be contributed to an alternate algorithm that it has good performance to protecting system in transmission line. This application used by using software Matlab.

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Hao, Sheng, i Huyin Zhang. "MAC Performance Analysis for Reliable Power-Line Communication Networks with ARQ Scheme". Sensors 21, nr 1 (30.12.2020): 196. http://dx.doi.org/10.3390/s21010196.

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Power-line communication (PLC) networks have been increasingly used for constructing industrial IoT (internet of things) and home networking systems due to their low-cost installation and broad coverage feature. To guarantee the transmission reliability, ARQ (automatic repeat request) scheme is introduced into the link layer of reliable PLC networks, which allows the retransmission of a data frame several times so that it has a higher probability to be correctly received. However, current studies of performance analysis for PLC MAC (medium access control) protocol (i.e., IEEE 1901) do not take into account of the impact of ARQ scheme. To resolve this problem, we propose an analytical model to investigate the MAC performance of IEEE 1901 protocol for reliable PLC networks with ARQ scheme. In the modeling process, we first establish a PLC channel model to reflect the impacts of PLC channel types (containing Rayleigh fading and Log-normal fading), additive non-Gaussian noise feature and ARQ scheme on data transmission at link layer. Next, we employ Renewal theory and Queueing dynamics to capture the transmission attempt behavior of executing IEEE 1901 protocol in the unsaturated environment with finite transit buffer size. On the basis of combining these two models, we derive the closed-form expressions of 1901 MAC metrics considering the influence of the ARQ scheme. Furthermore, we prove that the proposed analytical model has the convergence property. Finally, we evaluate the MAC performance of 1901 protocol for reliable PLC networks with ARQ scheme and verify the proposed analytical model.

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Li, Yan, Decheng Wang i Xiaojun Zhu. "Research on Transmission Scheme for Important Transmission Sections by Changing Original AC Lines into DC Lines". Journal of Physics: Conference Series 2401, nr 1 (1.12.2022): 012063. http://dx.doi.org/10.1088/1742-6596/2401/1/012063.

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Abstract Affected by geographical conditions and construction conditions, the number and capacity of transmission lines connecting different regions are limited. Meanwhile, the power on each transmission line does not reach the rated capacity and the power flow distribution is uneven due to the grid structure in traditional power systems. Changing original AC lines into DC lines is provided for improving power transmission. DC system-based MMC is also discussed and designed. Simulation results demonstrate the feasibility and performance of the proposed transmission scheme.

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Crawford, Travis D., i Allen L. Garner. "Nonlinear Transmission Line Performance as a Combined Pulse Forming Line and High-Power Microwave Source as a Function of Line Impedance". Applied Sciences 12, nr 20 (13.10.2022): 10305. http://dx.doi.org/10.3390/app122010305.

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Nonlinear transmission lines (NLTLs) offer compact, low-cost, all solid-state high-power microwave (HPM) generation. This article experimentally investigates the RF output power for composite-based 10, 25, and 50 Ω NLTLs used as a combined pulse forming line and HPM source. We manufactured coaxial NLTLs containing 10% barium strontium titanate and 15% nickel zinc ferrite encased in polydimethylsiloxane. The output voltage and power in the time and frequency domains, respectively, showed that the 10 Ω NLTL generated the greatest RF output. The 25 Ω NLTL generated greater output power from 500–1100 MHz than the 50 Ω NLTL. This occurs because reducing the NLTL impedance induces a larger transient current for a given charging voltage. This transient current corresponds to a stronger transient magnetic field, which facilitates magnetic moment alignment to allow for coherent magnetic moment rotation to occur. This setup eliminates the separate pulse forming network and magnetic field bias that typically occurs in other NLTL systems, which provides additional flexibility in tuning the NLTL impedance and reducing device footprint.

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42

Balasubbareddy, M., G. V. K. Murthy i K. Sowjan Kumar. "Performance evaluation of different structures of power system stabilizers". International Journal of Electrical and Computer Engineering (IJECE) 11, nr 1 (1.02.2021): 114. http://dx.doi.org/10.11591/ijece.v11i1.pp114-123.

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The electric power from the system should be reliable and economical for consumer’s equipment satisfaction. An electric power system consists of many generators, transformers, transmission lines, loads, etc. For the power system network, dynamic performance and stability are important. The system is lost its stability by some disturbances i.e., load variations, generator failure, prime mover failure, transmission line outage, etc. Whenever load variations in the system, generator rotor speed will vary, means oscillations in the rotor speed, which is deviating from rated speed. The excitation system will control the generator rated line voltage. When fault occurs at any equipment in the system, the system will unstable. If fault occurs at generator, the generator oscillates. To reduce the oscillations and to make the system stable used power system stabilizers (PSS’s). Here, three types of PSS’s are used i.e., PSS1B, PSS2B, PSS4B. Comparisons of three PSS’s are on the multi machine system under some disturbance. From the observations, concluding that PSS4B is quickly control the oscillations in the physical parameters of machine in the system than other power system stabilizers.

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Ogar, Vincent Nsed, Sajjad Hussain i Kelum A. A. Gamage. "Transmission Line Fault Classification of Multi-Dataset Using CatBoost Classifier". Signals 3, nr 3 (5.07.2022): 468–82. http://dx.doi.org/10.3390/signals3030027.

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Transmission line fault classification forms the basis of fault protection management in power systems. Because faults have adverse effects on transmission lines, adequate measures must be implemented to avoid power outages. This paper focuses on using the categorical boosting (CatBoost) algorithm classifier to analyse and train multiple voltage and current data from a 330 kV and 500 km-long simulated faulty transmission line model designed using Matlab/Simulink. From it, 93,340 fault data sizes were extracted. The CatBoost classifier was employed to classify the faults after different machine learning algorithms were used to train the same data with different parameters. The trainer achieved the best accuracy of 99.54%, with an error of 0.46% for 748 iterations out of 1000. The algorithm was selected for its high performance in classifying faults based on accuracy, precision and speed. In addition, it is easy to use and handles multiple data-sets. In contrast, a support vector machine and an artificial neural network each has a longer training time than the proposed method’s 58.5 s. Proper fault classification techniques assist in the effective fault management and planning of power system control thereby preventing energy waste and providing high performance.

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Selvaraj, M., S. M. Kulkarni i R. Rameshbabu. "Performance Analysis of a Overhead Power Transmission Line Tower Using Polymer Composite Material". Procedia Materials Science 5 (2014): 1340–48. http://dx.doi.org/10.1016/j.mspro.2014.07.451.

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45

Seyedtabaii, S. "Improvement in the performance of neural network-based power transmission line fault classifiers". IET Generation, Transmission & Distribution 6, nr 8 (2012): 731. http://dx.doi.org/10.1049/iet-gtd.2011.0757.

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Lu, Li Ping, i Ping Xia Xu. "Network Performance of a PLC Protocol for Smart Grid". Advanced Materials Research 532-533 (czerwiec 2012): 571–75. http://dx.doi.org/10.4028/www.scientific.net/amr.532-533.571.

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Implementing smart grid demands a wide area communication network for connecting all the feeder equipments, consumers’ meters and high-consuming appliances, etc, for both utilities’ and consumers’ applications. Using power line itself as a communication medium is an ideal solution for construction of a cost-effective and high speed transmission network. A new flooding-based routing protocol has been developed. The PLC (Power Line Communication) network performances of this protocol are evaluated using theoretical analysis.

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Yang, Xiao Hui, Bo Zhang, Wen Juan Lou i Zheng Cai Fu. "The Analysis of Galloping-Endurance Character of 500kV Power Transmission Tower". Applied Mechanics and Materials 333-335 (lipiec 2013): 2123–29. http://dx.doi.org/10.4028/www.scientific.net/amm.333-335.2123.

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With transmission line galloping occurring frequently in recent years, the phenomenon of tower damaged by galloping has become more and more serious, even with the whole tower collapsed during galloping. According to the statistic and analysis on the towers in 500kV transmission line of Henan power grid, which had been damaged by the galloping accidents in the winter of 2009 to 2010, The galloping section of 500kV Kai-Xiang Line with the typical impaired character had been selected for laboratory modeling and test. Through a series of tests, the maximum loading position and the vibration model for tower had been found, and the changing character of towers dynamic response with ice thickness, galloping amplitude and frequency analyzed. The loading-endurance character of rod and bolts joint, as the major components of tower, had been tested and analyzed respectively. The bolts joints, had been proved as the weakest point for galloping-endurance performance of the whole tower. The study stated in this paper would provide guidance and suggestion to the alteration on galloping prevention and controlling for transmission line. It was also shown that, developing the study on the locking performance of bolts joints on tower is quite essential.

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Zhang, Zhuoqun, Hongnan Li, Gang Li, Wenming Wang i Li Tian. "The Numerical Analysis of Transmission Tower-Line System Wind-Induced Collapsed Performance". Mathematical Problems in Engineering 2013 (2013): 1–11. http://dx.doi.org/10.1155/2013/413275.

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The numerical simulation of transmission tower-line systems' progressive collapse performance is considered as a major research hotspot and significant project, due to the increasing number of wind-induced collapse accidents recently. In this study, the finite element models for single tower and transmission tower-line system were established to simulate wind-induced progressive collapse by birth-to-death element technique in ABAQUS/Explicit. The wind field, based on the Kaimal fluctuating wind power spectrum and harmonic superposition method, was constructed by MATLAB commercial software. The current research focuses on the dynamic behaviour and the mechanism of a typical transmission tower-line system progressive collapse under wind action with clear step-by-step description. The numerical simulation results demonstrated that transmission tower-line system collapse mechanism depended on the number, position and last deformation of damage elements. Since the gallop effect of conductor and ground lines were ignored in the single tower model, the transmission tower-line system model, which has higher computational precision than the single tower model, is relatively accurate and recommended strongly in the design.

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Kumar, Abhishek, Pramod Kumar Rathore i Dr Ashok Kumar Jhala. "Analysis of Six-Phase Transmission Lines for Increasing Power". SMART MOVES JOURNAL IJOSCIENCE 6, nr 4 (10.04.2020): 10–16. http://dx.doi.org/10.24113/ijoscience.v6i4.281.

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In the India, especially in metropolitan areas, transmission infrastructure is congested due to a combination of increasing load demands, declining investment, and aging facilities. It is anticipated that significant investments will be required for new construction and upgrades in order to serve load demands. This paper explores higher phase order systems, specifically, six-phase, as a means of increasing power transfer capability, and provides a comparison with conventional three-phase double circuit transmission lines. Line parameters calculations performed in this thesis show that line impedances in six-phase lines have a slight difference, compared to three-phase double circuit line. The electric and magnetic fields calculations show that, ground level electric fields of the six-phase lines decline more rapidly as the distance from center of the lines increase. The six-phase lines have a better performance on ground level magnetic field. Based on the electric and magnetic field results, right of way requirements for the six-phase lines and three-phase double circuit line were calculated. The calculation results of right of way show that six-phase lines provide higher power transfer capability with a given right of way.

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Yang, Zhen Wei, Wei Yi i Yu Jin. "Application Research on the Intellectual Inspection System of Transmission Line Based on the “Mobile Information Platform”". Applied Mechanics and Materials 596 (lipiec 2014): 719–22. http://dx.doi.org/10.4028/www.scientific.net/amm.596.719.

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The power transmission line is one of the important parts of electrical power system, the management and in-spection of the transmission lines have been significant routine job ensuring the reliability of the transmission system. According to actual requirements and characteristics of Transmission line inspection, the intellectual inspection system of transmission line based on Mobile information platform was designed using Geographic Information System (GIS). This novel inspection system was composed of GIS,Global Positioning System (GPS), PDA and GPRS. The system changes the traditional inspection modes.Owing to the advantages of high reliability, practicability and scalability, the practical application of this intellectual inspection system shows that it completely meets the requirements for fast speed, high efficiency and real-time performance.

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