Journal of South China University of Technology (Natural Science Edition) ›› 2006, Vol. 34 ›› Issue (10): 89-93.

• Power & Electrical Engineering • Previous Articles     Next Articles

Probabilistic Calculation of the Nearest Power Critical Point

Zong Xiu-hong  Zhang Yao  Wu Zhi-gang  Zhang Zhi-chao   

  1. School of Electric Power,South China Univ.of Tech.,Guangzhou 510640,Guangdong,China
  • Received:2005-10-24 Online:2006-10-25 Published:2006-10-25
  • Contact: 宗秀红(1978-)，女，博士生，主要从事电力系统稳定性分析与控制研究 E-mail:tfdong@sohu.com
  • About author:宗秀红(1978-)，女，博士生，主要从事电力系统稳定性分析与控制研究
  • Supported by:

    国家自然科学基金重点资助项目(50337010)；高等学校博士学科点专项科研基金资助项目(20020561004)

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Abstract:

The power limit(or voltage stability margin)serves as an important index to describe the static voltage stability of power system.As the conventional method to calculate the nearest power critical point(or the minimum voltage stability margin)is based on a single system-operating state,the obtained results tend to be optimistic.In this paper,multiple system-operating conditions in a system period in the probabilistic environment are considered
by inserting the probabilistic characteristics(the mean values and the covariance)of nodal voltages and nodal powers into power flow equations.The minimum voltage stability margin of the system in multiple operating conditions is computed accordingly,and the corresponding margin distribution with a normal probability is finally calculated.

Key words: voltage stability, power limit, saddle node bifurcation, probabilistic power flow, continuous power flow