Готові списки джерел за темами / WEAK BUSES

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Добірка наукової літератури з теми "WEAK BUSES"

Автор: Grafiati

Опубліковано: 11 вересня 2023

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Статті в журналах з теми "WEAK BUSES"

Liu, Yunxin, Liangzhong Yao, Siyang Liao, Jian Xu, Di Wu, Wei Tang, and Cheng Yang. "The Voltage Regulation Control Strategy with Distributed Photovoltaic Participation under Serious Failure Based on Transient Voltage Margin." E3S Web of Conferences 186 (2020): 01002. http://dx.doi.org/10.1051/e3sconf/202018601002.

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With the poor ability of distributed PV to withstand voltage fluctuation, the voltage fluctuation caused by DC blocking can lead to large-scale disorderly de-networking of distributed PV, especially those distributed PV which close to voltage weak buses. which means that more and more attentions are paid to the transient voltage stability (TVS). If distributed PV can participation in reactive compensation, we don’t need to add additional reactive power compensator, voltage stability of voltage weak buses will be increased, which can reduce PV off-grid. Therefore, for the HVDC receiving end system under distributed PV intensive access, first of all, we need to find the voltage weak bus, then increase the reactive power output of distributed PV near the voltage weak buses to increase transient voltage margin. Taking the simplified model of power system in Anhui Province as an example, the validity of the strategy is verified, and the results show that the transient voltage stability of the system has been improved.

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Verayiah, Renuga, Azah Mohamed, and Syahirah Abd Halim. "Reactive Power Tracing Index LQP_LT for Voltage Unstable Load Bus Identification in Power Systems." Indonesian Journal of Electrical Engineering and Computer Science 12, no. 3 (December 1, 2018): 889. http://dx.doi.org/10.11591/ijeecs.v12.i3.pp889-898.

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Existing power systems are significantly susceptible to voltage instability problem since such systems are stressed with the huge power transfers across the grids. To guarantee power system stability during stressed conditions, it is important to first identify the voltage unstable load buses to determine appropriate locations for under voltage load shedding. In this study, a new method is proposed for determining weak load bus locations by using reactive power tracing to develop a novel reactive power tracing capable index, named as LQP_LT. The reactive power tracing algorithm is integrated with the LQP_LT index formulation to generate priority ranking list of weak load buses. The LQP_LT index was tested on the 57 bus system and the resulting priority ranking list is found to have successfully determined the weak load buses for load shedding in the test system. Comparison with other stability indices revealed that the LQP_LT has better sensitivity and response towards determining the location of the weakest load bus for under voltage load shedding implementation.

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Amusan, Olumuyiwa T., Nnamdi I. Nwulu, and Saheed Lekan Gbadamosi. "Identification of Weak Buses for Optimal Load Shedding Using Differential Evolution." Sustainability 14, no. 6 (March 8, 2022): 3146. http://dx.doi.org/10.3390/su14063146.

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For the sustainability of power supply and operation systems, planners aim to deliver power at an optimum value to consumers, while maintaining stability in the system. The load-shedding approach has proven to be an effective means of achieving the desired stability. This paper presents a nodal analysis to establish critical bus identification in the power grid. A power simulation for load shedding was created using the power system analysis toolbox (PSAT) for identifying and isolating weak buses on the power system. A computational algorithm was developed using differential evolution (DE) for minimizing service interruptions and blackouts, and was tested against the conventional genetic algorithm (GA). The proposed algorithm was implemented on an IEEE 30-bus test system. The simulation results were analyzed before and after the application of DE. It was observed that after the application of DE, load shedding gives an efficient result of 10.6%, 8.7%, and 13.4% improvement at buses 26, 29, and 30, respectively, after being tested using a genetic algorithm (GA), with a result of 10.2%, 7.6% and 13.1% on the same respective buses. This work will further expand the reliability and availability of power systems toward a sustainable, steady power supply that is void of nodal or bus cutoffs.

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Song, Y. H., H. B. Wan, and A. T. Johns. "Kohonen neural network based approach to voltage weak buses/areas identification." IEE Proceedings - Generation, Transmission and Distribution 144, no. 3 (1997): 340. http://dx.doi.org/10.1049/ip-gtd:19970913.

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Li, Jia Long, and Wei Wei. "Study on Voltage Stability Weak Buses of Power System with Multiple Power Sources Integrated." Applied Mechanics and Materials 391 (September 2013): 281–86. http://dx.doi.org/10.4028/www.scientific.net/amm.391.281.

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To obtain the distribution of voltage stability weak buses (VSWB) for power system with multiple power sources integrated, so as to provide a basis for voltage stability control, an analysis method under full time frame is proposed in this paper. Based on the modeling of multiple power sources, combined with the load prediction, the active power output prediction of wind and photovoltaic power and the generation scheduling of conventional power, considering different patterns of load increase and power output increase and allocation of multiple power sources, within a certain period of time and for the specifically selected time sections, the continuation power flow method is respectively used to get the voltage stability critical point (SNB point), where modal analysis is applied, so that the VSWB are obtained of the certain time section. The same calculation is carried out for all the time sections selected, and then the distribution and occurrence frequency of VSWB are summed up, thereby acquiring the concrete condition of VSWB within such certain time period. Its considered that the condition of VSWB can be affected by the different integration buses and penetration rates of multiple power sources. The proposed method is verified on the IEEE 118-bus system, as well as the fact with practical significance that the condition of VSWB varies with the difference of integration buses and the penetration rates of multiple power sources.

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Verayiah, Renuga, and Azah Mohamed. "Comparison of Weak Load Bus Detection using LQP_LT Index with PV and QV Analysis of PSS/E." Indonesian Journal of Electrical Engineering and Computer Science 12, no. 2 (November 1, 2018): 577. http://dx.doi.org/10.11591/ijeecs.v12.i2.pp577-584.

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Identification of weak load buses which contributes to voltage instability problem is crucial in order for an appropriate mitigation action to be executed. The current power system transmission is not only stressed to deliver high load demand at the receiving end but also facing new challenges brought by the penetratrion of renewable energy sources. This new scenario requires power system operation and analysis to be robust and fast in detecting the accurate weak load bus for correction action. Due to this, many online indices to detect weak load bus during power system contingency have been developed. Nevertheless, LQP_LT is of the latest index developed which ultimately has the reactive power tracing capability for weak load bus detection and generate priority ranking list of the weak load buses. This index was tested on IEEE 14 bus test system for different contingency scenarios. The results obtained from the LQP_LT index is compared and validated with the PV and QV analyses obtained using industrial graded PSS/E software. It was concluded that the LQP_LT index is found to be robust, efficient and need less computation time as compared to the execution of voltage stability analysis using the PSS/E Tool.

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Dandotia, Ashish, Mukesh Kumar Gupta, Malay Kumar Banerjee, Suraj Kumar Singh, Bojan Đurin, Dragana Dogančić, and Nikola Kranjčić. "Optimal Placement and Size of SVC with Cost-Effective Function Using Genetic Algorithm for Voltage Profile Improvement in Renewable Integrated Power Systems." Energies 16, no. 6 (March 10, 2023): 2637. http://dx.doi.org/10.3390/en16062637.

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Given the concern for maintaining voltage stability in power systems integrated with renewable power systems due to a mismatch in generation and demand, there remains a need to invoke flexible alternating current transmission system (FACTS) devices in the distribution network. The present paper deals with identifying the locations of placement of a static var compensator in an experimental IEEE 14-bus system; the voltage drop in different buses in an IEEE 14-bus system is calculated by the standard formula. The total voltage drop in the network (TVDN) is also calculated as a reference. The ranking of buses in order of decreasing voltage drop is made, and the weak buses are identified as those showing the maximum or near-maximum voltage drop for the installation of a Static Var Compensator (SVC). The optimum usable size is calculated using a Genetic Algorithm approach to optimize the installation cost. After size optimization, installing a 2 MW solar generator is considered for the weak and most potential bus, which suffers from voltage drops or power loss. Based on the generator at the weakest bus, the total power loss in the network is calculated and compared with a similar method to assess the efficiency of the proposed model. Thus, the voltage stability enhancement problem is solved by applying a Genetic algorithm (GA) to optimize SVC size and using the Total Voltage Drop in Network (TVDN) method to identify weak buses in the systems. It is found that the performance of the proposed system is comparable with another existing system. It is further observed that a gain in power loss to 6.56% is achievable by adopting the proposed strategy, and the gain is better than the other system.

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Mogaka, Ombuki, Roy Orenge, and Julius Ndirangu. "Static Voltage Stability Assessment of the Kenyan Power Network." Journal of Electrical and Computer Engineering 2021 (February 24, 2021): 1–16. http://dx.doi.org/10.1155/2021/5079607.

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In recent years, the Kenyan Power Network has witnessed large growths in load demand. Although the increased load demand has somewhat been matched with an increase in transmission and generation capacity, the rate of expansion has not been matched with the rate of increase in load demand due to economic, environmental, and geographical constraints. This has led to the system being prone to instability since it is being operated under stressed conditions. In the recent past, several studies have been carried out on voltage stability analysis and improvement using various conventional methods. However, conventional methods have various limitations in their utilization for voltage stability analysis. One solution to overcome these limitations is to employ a combination of one or more methods so as to get more information and greater degree of accuracy in voltage stability studies. In this paper, a methodology is proposed involving the combination of QV modal analysis, sensitivity analysis (VQ) and power-voltage curves in assessing the static voltage stability analysis taking a case study of the Kenyan Power Network. V-Q sensitivity analysis and QV modal analysis have been used to identify the load regions most susceptible to voltage instability and the corresponding weak buses in the network for various V-Q responses. Reactive power loss sensitivities for branches in the network have been used to determine the critical (weak) lines in the network. Loading margins (LM) and voltage stability margins (VSM) have then been used to determine the proximity to voltage collapse of the voltage weak buses identified by QV modal analysis. The effect of tripping one the critical lines on the voltage weak buses is also investigated. The current high voltage power network under the average peak loading conditions during the year 2019 is considered for the study. The paper also reviews existing voltage stability analysis methods and their limitations.

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Hlaing, Ya Min Su, and Ze Ya Aung. "Performance Analysis on Transmission Line for Improvement of Load Flow." Advanced Materials Research 433-440 (January 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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Acharjee, P. "Identification of maximum loadability limit and weak buses using security constraint genetic algorithm." International Journal of Electrical Power & Energy Systems 36, no. 1 (March 2012): 40–50. http://dx.doi.org/10.1016/j.ijepes.2011.10.021.

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Більше джерел

Дисертації з теми "WEAK BUSES"

Jain, Ayush. "Development and Characterization of Multi-scale Polymer Composite Materials for Tribological Applications." Thesis, Luleå tekniska universitet, Maskinelement, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-65241.

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With industries aiming at higher efficiencies, lightweight parts, and easier manufacturability there has been a recent trend of replacing the metallic materials with polymeric materials and its composites. Particularly in the automotive industry, there is a demand of replacing metallic material of bushes and bearings with polymer based materials (PBM). For these heavy performance requirements (as in automobiles), the commonly used industrial polymers like Acetal and Nylon fail to provide good mechanical and tribological performance. High-performance polymer like Polyphenylene Sulfide (PPS) is a relatively newer material and shows a potential of being a PBM alternative for metallic bearings in automobiles if their tribological performance can be improved. One of the ways of improving the tribological performance of the polymer is by the addition of filler material, hence making a polymer composite. In this study, we used Short Carbon Fibre as micro-reinforcement material and Nano-diamonds and Graphene Oxide as nano-reinforcement material to make PPS composites. The varying mechanical and tribological behaviour of PPS composites with different weight percentage of reinforcement materials was investigated. The optimum composition of the reinforcement materials was identified, which resulted in significant improvement in mechanical and tribological properties of the base material.

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SINGH, OMPRAKASH. "IDENTIFICATION OF WEAK BUSES AND IMPROVING VOLTAGE PROFILE UNDER VARING LOAD CONDITIONS USING STATCOM IN IEEE-14 BUS POWER SYSTEM." Thesis, 2014. http://dspace.dtu.ac.in:8080/jspui/handle/repository/19409.

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The whole world faces energy shortages, power scenario in present. There is a deficit between energy demand and energy supplied. The per capita energy consumption indicates the living standard of the society of the country and also it shows the development of the country. Every country is trying to harness the energy obtained from natural resources and maximize it, due to the limited resources of the fossil fuels. The major issue in these problem is the voltage collapse of transmission system which is most suffered by the frequent variations load. In this project, we focus on the detection and identification of weakest busses under variation load. Voltage variation problem increase day-by-day with increasing load demand power. Therefore the efficiency and power quality of power is become poor for consumer service due to increasing load demand, voltage goes down. Thus the system stability or voltage profile is poor at various buses in an interconnected power system under varying load conditions (varying load 0 to 50% increasing). Hence the voltage magnitudes and angles also change which are responsible for voltage instability which have major result in blackout. For the continuation power flow voltage magnitude, angle, real and reactive power should be maintained so that voltage stability improved. Finding the weakest buses during increasing load by Newton-Raphson method with MATLAB programming and compare all results with original results with and without STATCOM in an interconnected in IEEE 14 bus power system. As the results the voltage at the buses goes below to specified voltage profile lower limit 0.98 p.u. during heavy load conditions or voltage may exceed voltage profile upper limit 1.0 p.u. during light load conditions, at there identified weakest buses allocation for the adjusted FACTS controllers to improve voltage profile limit (0.98 p.u or 1.0 p.u ) of IEEE-14 bus power system to maintained reactive power in IEEE-14 power system.

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Книги з теми "WEAK BUSES"

Kratt, Regina. Joseph von Kopf, 1827-1903: Das Werk des Bildhauers mit typologischen Studien zur Büste und Gruppe. Aachen: Verlag Mainz, 1998.

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Miles, Philip C. Tyne and Wear Trams and Buses in Camera (In Camera S.). Quotes Ltd, 1996.

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Tauranac, Ltd. New York City, Manhattan buses and subways: 7 days a week, 24 hours a day, weekdays, evenings & weekends, late nights : A Tauranac map. Tauranac Ltd, 1998.

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Частини книг з теми "WEAK BUSES"

Soria, Federico, Julia E. de la Cruz, Marcos Cepeda, Álvaro Serrano, and Francisco M. Sánchez-Margallo. "Biodegradable Urinary Stents." In Urinary Stents, 359–73. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-04484-7_29.

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AbstractIn the twenty-first century, it is difficult to understand that a medical device as widely used as urinary stents require a second medical procedure for removal. Research in the development of biocompatible biodegradable urinary stents (BUS) has been one of the most important research areas of innovation in the urology stent technology. The main characteristics of a BUS are related to its ability to degrade into non-obstructive fragments in a predefined time and to be removed through micturition, after providing an appropriate internal scaffold effect and urinary drainage.One of the barriers slowing down the progress of research are the lack of agreement between in vitro and in vivo degradation rates demonstrated in a large number of experimental studies. Unfortunately, currently the absence of BUSs in clinical practice is mainly due to the complicated degradation rate control, maintenance of mechanical properties and safe urinary excretion of stent fragments. In order to alleviate the weak mechanical properties of degradable biomaterials, research has been started with metallic BUS with very promising results. In this regard, Mg2+ and its alloys have been used in in vitro and in vivo studies.Another area of current research is the emergence of ureteral BUS to provide a new approach for local drug delivery in upper urinary tract. Drugs may be released while the stent is degrading. Although these innovations are still under research, it is foreseeable that in the near future they could be used to improve the lives of patients.

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Moger, Tukaram, and Thukaram Dhadbanjan. "Reactive Power Loss Index for Identification of Weak Nodes and Reactive Compensation Analysis to Improve Steady State Voltage Stability." In Advances in Environmental Engineering and Green Technologies, 177–237. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-5225-8551-0.ch007.

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This chapter presents a new reactive power loss index for identification of weak buses in the system. This index can be used for identification of weak buses in the systems. The new reactive power loss index is illustrated on sample 5-bus system, and tested on sample 10-bus equivalent system and 72-bus equivalent system of Indian southern region power grid. The validation of the weak buses identification from the reactive power loss index with that from other existing methods in the literature is carried out to demonstrate the effectiveness of the index. Simulation results show that the identification of weak buses in the system from the new reactive power loss index is completely non-iterative, and thus requires minimal computational efforts as compared with other existing methods in the literature.

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Buss, Sarah. "Transcript of an Interview with Gary Watson." In Oxford Studies in Agency and Responsibility Volume 5, 240–58. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198830238.003.0012.

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This is a transcript of an interview with Gary Watson conducted by Sarah Buss on November 3, 2016. It commences with some autobiographical context: Watson became interested in philosophy after high school upon meeting a philosophy major at an artist’s colony. The study of political philosophy drew him into considering freedom and responsibility, and autonomy. The case of Harris is covered as an investigation of normative competency. Problems with the notion of weak will and self-control are discussed. Asked for any important changes in his thinking, Watson responds that he conflated issues of autonomy and of responsibility; this bears also on responsibility in a weak-willed agent. Finally, Watson asserts that freedom is not just about responsibility; it’s also about having a capacity to direct your life in a certain way. He hopes to investigate this further.

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Molotch, Harvey, and Davide Ponzini. "Introduction." In The New Arab Urban, 1–32. NYU Press, 2019. http://dx.doi.org/10.18574/nyu/9781479880010.003.0001.

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The urban Gulf busts up past paradigms for understanding urban development. Markets are only partially operative, democracy is absent and civic engagement is weak. But some of its large and sophisticated cities are now forces in the world. At the concrete level of development, there is less blockage from planners, regulations, or work-place rules. Gulf cities function as ‘test beds’ where designs, structures, and technologies can fast-track. Besides importing world trends, things happening in the Gulf now also move out of the Gulf. Gulf cities, due to their extremes, remain famous in their contradictions and compromises. Parts that would appear inconsistent, even mutually exclusive, are somehow made to cohere.

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Johnson, Samuel. "The prince meditates his escape." In The History of Rasselas, Prince of Abissinia, edited by Thomas Keymer. Oxford University Press, 2009. http://dx.doi.org/10.1093/owc/9780199229970.003.0005.

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He now found that it would be very difficult to effect that which it was very easy to suppose effected. When he looked round about him, he saw himself confined by the bars of nature which had never yet been broken, and by the gate, through which none that once had passed it were ever able to return. He was now impatient as an eagle in a grate.* He passed week after week in clambering the mountains, to see if there was any aperture which the bushes might conceal, but found all the summits inaccessible by their prominence. The iron gate he despaired to open; for it was not only secured with all the power of art, but was always watched by successive sentinels, and was by its position exposed to the perpetual observation of all the inhabitants.

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"Wear and Failure of Babbit Bushes in Steam Turbine Sliding Bearings." In ASM Failure Analysis Case Histories: Mechanical and Machine Components. ASM International, 2019. http://dx.doi.org/10.31399/asm.fach.mech.c9001533.

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Тези доповідей конференцій з теми "WEAK BUSES"

Gao, Peng, Libao Shi, Liangzhong Yao, Yixin Ni, and Masoud Bazargan. "Multi-criteria integrated voltage stability index for weak buses identification." In 2009 Transmission & Distribution Conference & Exposition: Asia and Pacific. IEEE, 2009. http://dx.doi.org/10.1109/td-asia.2009.5356950.

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Tianyu An, Suquan Zhou, and Jilai Yu. "Application of Fuzzy Maximal Tree Clustering for Weak Voltage Buses Grouping." In 2006 6th World Congress on Intelligent Control and Automation. IEEE, 2006. http://dx.doi.org/10.1109/wcica.2006.1713415.

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Manjaree Pandit, Laxmi Srivastava, and Vijay Singh. "Identification and ranking of weak buses using modified counterpropagation neural network." In 2006 IEEE Power India Conference. IEEE, 2006. http://dx.doi.org/10.1109/poweri.2006.1632531.

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Stratan, Ion, Tudor Radilov, Marin Pripa, and Victor Gropa. "Methodical approach to weak buses and ties detection in a power system." In 2017 International Conference on Electromechanical and Power Systems (SIELMEN). IEEE, 2017. http://dx.doi.org/10.1109/sielmen.2017.8123392.

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Yu, Juan, Wenyuan Li, Wei Yan, Xia Zhao, and Zhouyang Ren. "Evaluating risk indices of weak lines and buses causing static voltage instability." In 2011 IEEE Power & Energy Society General Meeting. IEEE, 2011. http://dx.doi.org/10.1109/pes.2011.6038889.

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Zhi-you, Xu, Liu Li, and Bai Di. "Equivalent Expression of Participation Factor for Weak Buses Ranking of Static Voltage Sability." In 2010 International Conference on Intelligent System Design and Engineering Application (ISDEA). IEEE, 2010. http://dx.doi.org/10.1109/isdea.2010.26.

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Alayande, A. S., A. A. Jimoh, and A. A. Yusuff. "Identification of critical buses and weak transmission lines using inherent structural characteristics theory." In 2015 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC). IEEE, 2015. http://dx.doi.org/10.1109/appeec.2015.7380974.

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Chanda, Sayonsom, and Bappa Das. "Identification of weak buses in a power network using novel voltage stability indicator in radial distribution system." In 2010 India International Conference on Power Electronics (IICPE). IEEE, 2011. http://dx.doi.org/10.1109/iicpe.2011.5728121.

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Guevara, Isaac, Marco Gutierrez, and Pavel Zuniga. "Identification of weak buses for proper placement of reactive compensation through sensitivity analysis using a neural network surrogate model." In 2015 IEEE International Autumn Meeting on Power, Electronics and Computing (ROPEC). IEEE, 2015. http://dx.doi.org/10.1109/ropec.2015.7395084.

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Moghbelli, H., Y. Gao, R. Langari, and M. Ehsani. "Investigation of Hybrid Fuel Cell (HFC) Technology Applications on the Future Passenger Railroad Transportation." In IEEE/ASME 2003 Joint Rail Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/rtd2003-1652.

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Due to the consideration of fragile security, and longer check-in times and inconveniences due to increased air travel security examination since September 11th 2001, more and more people have turn to ground transportation. Unfortunately, the inefficient, environment-unfriendly and unsafe passenger cars and buses are the only choices available for middle distance trips. Development of high efficiency, clean and high speed railroad passenger transportation system has become more necessary to overcome this weak link. In this paper, the applicability of hybrid drive train technologies for middle-distance passenger train locomotives will be investigated. A systematic design of the diesel based hybrid locomotive helps to increase efficiency, improve fuel economy, reduce emissions and also reduce mass production costs. Furthermore, professional management and maintenance of railroad train locomotives make such new technologies more practical than for road vehicles. The success of such transportation system will have a great positive impact on our social activities, quality of life, energy supply, environment and economy. A diesel based hybrid electric locomotive (HEL) with batteries or an ultracapacitor is an option to reduce fuel consumption and emissions and provide better performance and fuel economy. The reduced fuel consumption helps reduce the amount of pollutants released. Engineering estimation indicate that emissions will be reduced by 70% and fuel efficiency will be increased by at least 30% in hybrid locomotives.

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