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A voltage control strategy for preventing cascading trips of large-scale wind power in centralized area

Dianli Xitong Zidonghua/Automation of Electric power systems 2014年第11期38卷 7-12页

作者： Ding, Tao Guo, Qinglai Sun, Hongbin Xu, Fengda Xu, Xiaofei Jia, Lin Department of Electrical Engineering Tsinghua University Beijing China State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments Tsinghua University Beijing China North China Power Grid Co. Ltd. Beijing China

Cascading wind farm trips have brought new challenge to the wind power integration. Traditional reactive power optimization can achieve a desirable control result, but voltage security violation usually happens after N-1 contingency because of the redistribution of power flow and slow response by the reactive power compensator. Therefore, a reactive power optimization model is set up with security constraints, aiming to maintain the voltage within the security region under both normal condition and N-1 contingency. Besides, Benders decomposition method is employed to solve the complex model, dividing into one master and some slave problems. Iterative method is used between master and slave problems to obtain the optimal solution. Practical power grid with nine wind farms is tested, and the comparison of security constrained optimal power flow (SCOPF) and traditional optimal power plow shows that the SCOPF has better effect, which can maintain the voltage security under both normal condition and N-1 contingency. So it is an effective method to prevent cascading faults of multiple wind farms integrated into power grid. Finally, the relationship of maximum wind power integration, wind farm capacity and reactive power capacity of wind units is fully studied to provide certain help for the operation of wind farm. ©2014 State Grid Electric power Research Institute Press

关键词： Wind farm

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Recent advances on smart grid technology and renewable energy integration

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Science China(Technological Sciences) 2013年第12期56卷 3040-3048页

作者： MEI ShengWei CHEN LaiJun State Key Lab of Control and Simulation of Power Systems and Generation Equipments (Dept. of Electrical Engineering Tsinghua University)

With the integration of renewable energy generations and other related changes,the smart grid,or the future electric power system,is confronted with new challenges and ***,it is a promising subject in electrical engineering and much work has been done on *** paper reviews the recent advances on the technologies of smart grid and renewable energy integration,from the aspects of modeling,simulation,protection and control,stability,operation,and planning.

关键词： smart grid renewable energy integration modeling simulation protection and control stability operation planning

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Summary of Health Index Theory and Application of State Maintenance Equipment

Summary of Health Index Theory and Application of State Main...

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The 5th International Conference on Reliability of Electrical Products and Electrical Contacts

作者： Lin CHENG Manjun LIU Feijin PENG Dept.of Elec.Eng. Tsinghua UniversityState Key Lab of Control and Simulation of Power Systems and Generation Equipments Guangdong Power Grid Company Foshan Power Supply Bureau

This paper describes several methods for condition-based maintenance,introduced CBM,RCM development process,the main theoretical logic,techniques and *** on the health index based on equipment maintenance strategies,namely *** on the development of narrative context,theoretical foundation,model healthy *** for its application in power transformers were introduced.

关键词： Health Index(HI) Condition-Based Maintenance(CBM) Reliability Centered Maintenance(RCM) Condition Based Risk Maintenance(CBRM)

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Technology and Application of Online Partial Discharge Monitoring for power equipments

Technology and Application of Online Partial Discharge Monit...

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The 5th International Conference on Reliability of Electrical Products and Electrical Contacts

作者： Shengyou GAO Junfeng GUI Dept.of Elec.Eng. Tsinghua UniversityState Key Lab of Control and Simulation of Power Systems and Generation Equipments School of Electrical Engineering Beijing Jiaotong University

Online partial discharge monitoring for power equipments is useful to improve the capacity of the power *** technology for PD testing is introduced in this *** and disadvantages of pulse current,UHF,ultrasonic and TEV method are present The status quo of online PD monitoring is analyzed,and the detection effect of online PD monitoring is not *** to improve the effect are *** include built-in sensors,increasing sensitivity and sample *** of the state quo indicates that the relevant technical standards and specifications must be revised to improve the normalization and standardization.

关键词： Online monitoring partial discharge(PD) pulse current UHF ultrasonic TEV

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Dynamic simulation based on Jacobian-free Newton-GMRES methods with adaptive preconditioner for power systems

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Science China(Technological Sciences) 2013年第8期56卷 2037-2045页

作者： HUANG ShaoWei CHEN Ying SHEN Chen MEI ShengWei State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments(Department of Electrical Engineering Tsinghua University)

Dynamic simulation is one of the most complex and important computations for power systems *** solutions based on normal Newton iterations almost all depend on evaluations of Jacobian matrixes,which increases the programming complexity of and limits the parallelizability of the whole *** this paper,a new adaptive preconditioned Jacobian-free Newton-GMRES(m)method is proposed to be applied to dynamic simulations of power *** new method has totally Jacobian-free characteristics,which saves calculations and storages of Jacobian matrixes and features strong ***,several speedup strategies are introduced to enhance efficiency and parallelizability of overall *** tests are carried out on IEEE standard test systems and results show that in series computing environment,simulations based on the proposed method have comparable speed to those based on classical Newton-Raphson methods.

关键词： dynamic simulation Newton-GMRES preconditioner power system

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Impact of inertia control of DFIG wind turbines on system small-signal stability

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Dianli Xitong Zidonghua/Automation of Electric power systems 2014年第23期38卷 6-12页

作者： Chen, Runze Wu, Wenchuan Sun, Hongbin Lan, Haibo Liu, Haitao Liu, Xiaomin Department of Electrical Engineering Tsinghua University Beijing100084 China State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments Tsinghua University Beijing100084 China State Grid Jibei Electric Power Company Limited Beijing100053 China

The impact of inertia control of doubly-fed induction generator (DFIG) wind turbines on the small-signal stability of systems is studied. Firstly, the principle of DFIG wind turbines offering inertia responses is discussed, followed by the introduction of two approaches of inertia control. Then, possible influences of two control schemes on system small-signal stability are analyzed. Finally, on the basis of simulation, the modal analysis method is adopted to analyze the influence characteristics of different control strategies and various control parameters on system small-signal stability. Analysis results show that inertia control may have an appreciable impact on the system small-signal stability. Therefore, security constraints of small-signal stability should be carefully considered when designing the control strategy and parameters. ©, 2014 State Grid Electric power Research Institute Press.

关键词： Wind turbines

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Characteristics calculation and pattern recognition for partial discharge of cable joint

Characteristics calculation and pattern recognition for part...

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2014 International Conference on Communication Technology and Application(CTA2014)

作者： Y.F.Xia J.F.Gui X.Y.Chen S.Y.Gao J.H.Huang J.H.Lin Dongguan Power Breuse of Guangdong Grid School of Electrical Engineering Beijing Jiaotong University Department of Electrical Engineering Tsinghua University State Key Lab of Control and Simulation of Power Systems and Generation Equipments

ISBN: (纸本)9781845649302

For PD pattern recognition, six kinds of typical cable fault models are made and tested. Characteristics are calculated from test data. Multiple statistical characteristics of PD distribution map are calculated and pattern vectors are formed. Artificial neural network is trained for recognition. Through the selection and adjustment of characteristics and network parameters, recognition effect with satisfactory result is obtained.

关键词： cable joint partial discharge recognition

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Two-stage heuristic-correction for dynamic reactive power optimization based on relaxation-MPEC and MIQP

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Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering 2014年第13期34卷 2100-2107页

作者： Ding, Tao Guo, Qinglai Bo, Rui Sun, Hongbin Wu, Wenchuan Zhang, Boming Yao, Zhengyi State Key Lab. of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing 100084 China Midwest ISO St. Paul 55108 United States Baoji Power Supply Bureau Baoji 721004 Shannxi Province China

To achieve a fast approach to the dynamic reactive power optimization model, a mixed integer nonlinear programming model was set up, with consideration of the discrete reactive power equipment operation limit and power grid security constraints, to minimize the transmission losses. Furthermore, a method called heuristic search and variable correction was proposed that for the first stage, the discrete variables are relaxed into continuous ones, which leads to an optimization model with equilibrium constraints. According to the optimal value of relaxed model, a mixed integer quadratic programming model is formulated to minimize the objective of approximation variance, satisfied the discrete switching operation constraints in primary model. For the second stage, the continuous variables are redressed with respect to the determined discrete variables. The impact of adjustment step and operation limit on the optimal solution was fully studied in IEEE 14-bus test system. Besides, the result of IEEE 30, 57, 118 test systems show that an optimal solution can fast be obtained by proposed method, and the precision satisfies the actual engineering, which can also employ the parallel technology. © 2014 Chinese Society for Electrical Engineering.

关键词： Integer programming

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Low-carbon power grid index system and evaluation method

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Dianli Xitong Zidonghua/Automation of Electric power systems 2014年第17期38卷 157-162页

作者： Sun, Yanlong Kang, Chongqing Chen, Songsong Meng, Junxia Lu, Chang Luo, Jinshan Department of Electrical Engineering Tsinghua University Beijing100084 China State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments Tsinghua University Beijing100084 China China Electric Power Research Institute Beijing100192 China State Power Economic Research Institute Beijing102209 China

The importance of establishment of the low-carbon power grid index system and its comprehensive evaluation model for the development of the low-carbon power grid is firstly discussed. Based on the concept of life cycle analysis, a comprehensive low-carbon power grid index system and a more refined central index system are designed in consideration of different aspects of coverage, and the meaning of each index explicated in detail. Furthermore, a comprehensive evaluation method is designed for the quantization of the low-carbon developing condition of different power grids. Finally, an example analysis is conducted based on the statistical data of some domestic power grids to demonstrate the actual application of the evaluation model. © 2014 State Grid Electric power Research Institute Press

关键词： Electric power transmission networks

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Identification of inactive constraints for SCED model considering uncertain power injection

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Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering 2014年第34期34卷 6050-6057页

作者： Ding, Tao Bo, Rui Guo, Qinglai Sun, Hongbin Huang, Can Li, Fangxing State Key Lab of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing100084 China Midwest ISO St. Paul MN55108 United States Department of Electrical Engineering and Computer Science The University of Tennessee Knoxville TN37996 United States

With the constant expansion of power grid, a large number of security constraints have put tremendous challenges to the online economic dispatch. An efficient tool to eliminate the inactive constraints becomes necessary for security constraints economic dispatch (SCED) in large power systems. In this paper, considering the uncertainty of renewable energy integration, a fast and effective method to identify the inactive security constraints was proposed. Firstly, the definition of uncertain inactive security constraints and a necessary and sufficient condition to identify those were presented respectively. Considering the time-consuming identification, we relaxed the feasible region of original SCED model and utilized greedy algorithm to quickly eliminate part of inactive constraints. Then another necessary and sufficient condition was proposed and verified, where the remaining inactive constraints could be identified. Through the simulation of 24-time periods 9-bus system and 96-time periods IEEE 118-bus system, the speed and effectiveness of proposed method were verified. Moreover, the results can help dispatch operators to locate the transmission lines with the highest congestion risk. © 2014 Chin. Soc. for Elec. Eng.

关键词： Scheduling

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