Journal of South China University of Technology (Natural Science Edition) ›› 2013, Vol. 41 ›› Issue (4): 1-7.doi: 10.3969/j.issn.1000-565X.2013.04.001

• Power & Electrical Engineering •     Next Articles

Comparison of Two Methods to Compute Stability Margin of Static Voltage

Liu Ming-bo1 Yuan Kang-long1 Yang Liu-qing1 Lin Shun-jiang1 Yang Yin-guo2   

  1. 1.School of Electric Power∥Guangdong Key Laboratory of Clean Energy Technology,South China University ofTechnology,Guangzhou 510640,Guangdong,China; 2.Electric Power Dispatch and Control Center of GuangdongPower Grid Corporation,Guangzhou 510600,Guangdong,China
  • Received:2012-02-23 Revised:2012-09-16 Online:2013-04-25 Published:2013-03-01
  • Contact: 刘明波(1964-)，男，教授，博士生导师，主要从事电力系统优化、运行与控制研究． E-mail:epmbliu@scut.edu.cn
  • About author:刘明波(1964-)，男，教授，博士生导师，主要从事电力系统优化、运行与控制研究．
  • Supported by:

    国家自然科学基金资助项目( 51207056) ; 广东省绿色能源技术重点实验室开放式基金资助项目( 2008A060301002) ;华南理工大学中央高校基本科研业务费专项资金资助项目( 2011ZM0021)

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Abstract:

This paper deals with two methods for computing the stability margin of static voltage,namely the optimalpower flow method and the continuation power flow method.In the investigation,first,based on the equivalencydefinition of the two methods for determining the critical points of voltage stability,the cause of the stability margindifference between the two methods,namely,the inconformity of power flow equations,is pointed out.Then,thecomplementarity constraints describing the reactive power and the terminal voltage of generators are introduced in anew optimal power flow model,and the increase direction of the active power outputs of generators,which is thesame as that of the continuation power flow model,is adopted.Computational results on the IEEE 9-bus system,the IEEE 39-bus system and a real provincial 748-bus power system illustrate that the stability margin of the staticvoltage and the bifurcation type obtained by the optimal power flow model accord well with those obtained by thecontinuation power flow model.

Key words: static voltage, stability margin, optimal power flow method, continuation power flow method, saddle-node bifurcation, limit-induced bifurcation

CLC Number: