European Transactions on Electrical Power最新文献

Nonlinear multi‐index coordinated control of generator excitation and battery energy storage system 发电机励磁与蓄电池储能系统的非线性多指标协调控制

European Transactions on Electrical Power Pub Date : 2012-09-01 DOI: 10.1002/ETEP.602

Kang Li, Jie Wang

{"title":"Nonlinear multi‐index coordinated control of generator excitation and battery energy storage system","authors":"Kang Li, Jie Wang","doi":"10.1002/ETEP.602","DOIUrl":"https://doi.org/10.1002/ETEP.602","url":null,"abstract":"SUMMARY \u0000 \u0000The strong nonlinear nature of the generator and system behavior following a severe disturbance precludes the use of classical linear control techniques. The integration of an energy storage system, such as battery energy storage system (BESS), into a flexible alternating current transmission system device can provide dynamic decentralized active power capabilities and much needed flexibility for mitigating transmission level power flow problems. A model of power system with BESS compensation devices that integrate classic third-order model of generator and BESS model was deducted and established in this paper. The BESS unit is located near the generator bus terminal in a power system. Using multi-index nonlinear control design method, BESS and generator excitation were designed by coordinate control scheme for the model above. The controller proposed in this paper is good in improving the dynamic characteristics of state variables, so as to enhance the stable operation capacity of the system. The simulation on single-machine infinite-bus power system demonstrates the effectiveness and the practicality of the controller. Copyright © 2011 John Wiley & Sons, Ltd.","PeriodicalId":50474,"journal":{"name":"European Transactions on Electrical Power","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/ETEP.602","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51123308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Generation companies' adaptive bidding strategies using finite-state automata in a single-sided electricity market 单侧电力市场有限状态自动机下发电公司自适应竞价策略研究

European Transactions on Electrical Power Pub Date : 2012-09-01 DOI: 10.1002/ETEP.605

G. Sheblé, G. Gutiérrez-Alcaraz

引用次数: 3

Study on microstructure and electrical properties of oil‐impregnated paper insulation after exposure to partial discharge 部分放电后油浸纸绝缘材料的微观结构和电性能研究

European Transactions on Electrical Power Pub Date : 2012-09-01 DOI: 10.1002/ETEP.600

Jiaming Yan, R. Liao, Lijun Yang, Jian Li

{"title":"Study on microstructure and electrical properties of oil‐impregnated paper insulation after exposure to partial discharge","authors":"Jiaming Yan, R. Liao, Lijun Yang, Jian Li","doi":"10.1002/ETEP.600","DOIUrl":"https://doi.org/10.1002/ETEP.600","url":null,"abstract":"SUMMARY \u0000 \u0000This paper studied microstructure and its relationship with electrical properties for oil-impregnated paper insulation during partial discharge damage process. Material analysis apparatuses such as for atomic force microscopy and X-ray diffraction instrument, combined with electrical analysis apparatuses such as high-resistance meter, dielectric spectra meter, and cylinder–cylinder electrodes, were employed to investigate molecule chain structure, aggregation state structure, permittivity, dielectric loss factor, volume conductivity, and electrical strength of oil-impregnated paper insulation during the damage process. Results reveal that crystal regions of insulation paper suffer more severe damage during partial discharge damage process compared with the amorphous regions. Crystallinity exhibits an increasing trend and crystal grain orientation is enhanced, whereas crystal grain size, crystal type, and two-phase-coexistent structure are retained. Increased crystallinity and enhanced crystal grain orientation result in permittivity, volume conductivity, and dielectric loss factor decreasing, but electrical strength increasing. Changes in the activity of molecules, ions, and electrons are the results of variations of crystallinity and orientation; these are the main reasons for the change in electrical properties. Copyright © 2011 John Wiley & Sons, Ltd.","PeriodicalId":50474,"journal":{"name":"European Transactions on Electrical Power","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/ETEP.600","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51123241","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Modelling and evaluation of the lightning arc between a power line and a nearby tree 电力线与附近树木间闪电弧的模拟与评估

European Transactions on Electrical Power Pub Date : 2012-09-01 DOI: 10.1002/ETEP.606

M. Omidiora, N. Elkalashy, M. Lehtonen, M. Abdel-Rahman

{"title":"Modelling and evaluation of the lightning arc between a power line and a nearby tree","authors":"M. Omidiora, N. Elkalashy, M. Lehtonen, M. Abdel-Rahman","doi":"10.1002/ETEP.606","DOIUrl":"https://doi.org/10.1002/ETEP.606","url":null,"abstract":"SUMMARY \u0000 \u0000This paper addresses the modification of the existing dynamic arc model for lightning arc simulation application. The modified dynamic arc model combines the static and the dynamic arc equations that are already established in the literature to reproduce an arc fault involving a lightning-struck tree and a nearby power distribution line during rainfall. The results of experimental studies regarding arc creation between a tree and a nearby power line with artificial rainfall were obtained. A complete model of this phenomenon is reproduced using the electromagnetic transient program (ATP/EMTP) and the existing static and dynamic arc equations. The essential reason for modifying this model is graphically shown with a comparison of the dynamic arc and the modified dynamic arc models. The performance of the arc phenomenon was examined using a typical Finnish distribution network design. By means of simulation using the modified dynamic arc, developed within the ATP/EMTP software with its Transient Analysis Control System features, the lightning arc performance of the MV/LV network under the influence of nearby trees and the network characteristics is analyzed. It is expected that such a model can be included in the existing ATP/EMTP software packages for simulating power system transients. Copyright © 2011 John Wiley & Sons, Ltd.","PeriodicalId":50474,"journal":{"name":"European Transactions on Electrical Power","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/ETEP.606","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51123115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

A new fuzzy sliding mode controller for load frequency control of large hydropower plant using particle swarm optimization algorithm and Kalman estimator 基于粒子群优化算法和卡尔曼估计的大型水电站负荷频率模糊滑模控制器

European Transactions on Electrical Power Pub Date : 2012-09-01 DOI: 10.1002/ETEP.609

R. Hooshmand, M. Ataei, Abolfazl Zargari

{"title":"A new fuzzy sliding mode controller for load frequency control of large hydropower plant using particle swarm optimization algorithm and Kalman estimator","authors":"R. Hooshmand, M. Ataei, Abolfazl Zargari","doi":"10.1002/ETEP.609","DOIUrl":"https://doi.org/10.1002/ETEP.609","url":null,"abstract":"SUMMARY \u0000 \u0000The load frequency control (LFC) is very important in power system operation and control for supplying sufficient, reliable, and high-quality electric power. The conventional LFC uses an integral controller. In this paper, a new control system based on the fuzzy sliding mode controller is proposed for controlling the load frequency of nonlinear model of a hydropower plant, and this control system is compared with the proportional–integral controller and the conventional sliding mode controller. To regulate the membership functions of fuzzy system more accurately, the particle swarm optimization algorithm is also applied. Moreover, because of the unavailability of the control system variables, a nonlinear estimator is suggested for estimating and identifying the system state variables. This estimator provides the physical realization of the method and will reduce the costs of implementation. The proposed control method is performed for the LFC of hydropower plant of Karoon-3 in Shahrekord, Iran. The simulation results show the capability of the controller system in controlling local network frequency. Copyright © 2011 John Wiley & Sons, Ltd.","PeriodicalId":50474,"journal":{"name":"European Transactions on Electrical Power","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/ETEP.609","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51123551","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 26

A novel mathematical model for the lightning response of a grounding system buried in multilayered earth based on the quasi‐static complex image method 基于准静态复像法的多层地下接地系统雷电响应数学模型

European Transactions on Electrical Power Pub Date : 2012-09-01 DOI: 10.1002/ETEP.615

Li Zhong-xin, Li Guang-fan, Fan Jian-bin, Yinzhe Yu

引用次数: 14

A fault location method based on genetic algorithm for high‐voltage direct current transmission line 基于遗传算法的高压直流输电线路故障定位方法

European Transactions on Electrical Power Pub Date : 2012-09-01 DOI: 10.1002/ETEP.1659

Yongli Li, Shuo Zhang, Hongbo Li, Yongchang Zhai, Weiya Zhang, Yao Nie

{"title":"A fault location method based on genetic algorithm for high‐voltage direct current transmission line","authors":"Yongli Li, Shuo Zhang, Hongbo Li, Yongchang Zhai, Weiya Zhang, Yao Nie","doi":"10.1002/ETEP.1659","DOIUrl":"https://doi.org/10.1002/ETEP.1659","url":null,"abstract":"SUMMARY \u0000 \u0000A fault location method based on genetic algorithm for high-voltage direct current (HVDC) transmission line is proposed in this article. This method adopts the Bergeron model of transmission line, in which the voltage at any point of the line can be calculated by the voltage and current data sampled at both terminals of the line, and the fault position can be identified using the distributed characteristics of voltage along the line. Unlike the traditional fault location methods based on the Bergeron model, which depend on accurate line parameters and highly synchronized samples at two terminals of the line, the proposed method takes line parameters and asynchronous time at two terminals of the line together with the unknown fault location as the variables in model building to obtain the fault location. As an optimization problem, the model is solved by genetic algorithm. The significant advantage of the method is that it can reduce the influence of line parameter deviation and asynchronous samples at two terminals to the fault location result. The purpose of proposing this method is to avoid the situation without location result for the traveling wave fault location method when a grounding fault occurred with high resistance and to improve the accuracy of fault location result under harsh environment condition. The simulation model of a typical 500 kV HVDC transmission line in the Chinese power system was built by PSCAD, and MATLAB was used to verify the algorithm. Actual fault recording data obtained from the south grid of China were used to test the effectiveness of this method. Simulation results show that the proposed method is valid and is capable of eliminating the influence of line parameters deviation and asynchronous data on the accuracy of fault location results for the HVDC transmission line. Copyright © 2012 John Wiley & Sons, Ltd.","PeriodicalId":50474,"journal":{"name":"European Transactions on Electrical Power","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/ETEP.1659","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51059119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 22

Inductance profile calculation of step winding structure in tubular linear reluctance motor using three-dimensional finite element method 用三维有限元法计算管状直线磁阻电机阶跃绕组结构的电感轮廓

European Transactions on Electrical Power Pub Date : 2012-09-01 DOI: 10.1002/ETEP.599

A. Mosallanejad, A. Shoulaie

引用次数: 5

Modeling and simulating of single side short secondary linear induction motor for high speed studies 高速研究用单侧短次直线感应电动机的建模与仿真

European Transactions on Electrical Power Pub Date : 2012-09-01 DOI: 10.1002/ETEP.601

H. Hamzehbahmani

引用次数: 5

Flexibility evaluation and flexible comprehensive optimization in power systems 电力系统柔性评价与柔性综合优化

European Transactions on Electrical Power Pub Date : 2012-09-01 DOI: 10.1002/ETEP.617

Sun Weiqing, Wang Chengmin, Zhang Yan

{"title":"Flexibility evaluation and flexible comprehensive optimization in power systems","authors":"Sun Weiqing, Wang Chengmin, Zhang Yan","doi":"10.1002/ETEP.617","DOIUrl":"https://doi.org/10.1002/ETEP.617","url":null,"abstract":"SUMMARY \u0000 \u0000Smart grid puts forward new requirements in the planning, operation and management of power systems. Flexibility is one of the most important characters among the requirements. Traditional optimization analysis methods with single objective function and rigid constraints can hardly meet such requirements. This paper introduces the original concept of flexibility in industry process system analysis into power system analysis, analyzes their main differences and makes subdivision of power system flexibility into four kinds, namely property, constraint, load and structure flexibility. Rigid constraints in traditional analysis methods are transformed into flexible forms, and a power system flexibility evaluation method is proposed. Flexibility indices are defined and calculated to give intuitive measure of power system flexibility to grid dispatchers. Then, a flexible comprehensive optimization model in power system analysis is established. The result obtained is not an optimization for a single objective, but a comprehensive optimization considering system economy, safety and other objectives. Case study on IEEE 30-bus test system shows the validity of the methodology proposed. Copyright © 2011 John Wiley & Sons, Ltd.","PeriodicalId":50474,"journal":{"name":"European Transactions on Electrical Power","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/ETEP.617","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51124366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7