Comparison of two methods to compute stability margin of static voltage

作者：Liu, Ming-Bo^*; Yuan, Kang-Long; Yang, Liu-Qing; Lin, Shun-Jiang; Yang, Yin-Guo

来源：Journal of South China University of Technology(Natural Science Edition), 2013, 41(4): 1-7.

DOI：10.3969/j.issn.1000-565X.2013.04.001

• Continuation power flow method
• Limit induced bifurcation
• Optimal power flows
• Saddle node bifurcation
• Stability margins

This paper deals with two methods for computing the stability margin of static voltage, namely the optimal power flow method and the continuation power flow method. In the investigation, first, based on the equivalency definition of the two methods for determining the critical points of voltage stability, the cause of the stability margin difference between the two methods, namely, the inconformity of power flow equations, is pointed out. Then, the complementarity constraints describing the reactive power and the terminal voltage of generators are introduced in a new optimal power flow model, and the increase direction of the active power outputs of generators, which is the same 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 static voltage and the bifurcation type obtained by the optimal power flow model accord well with those obtained by the continuation power flow model.

• 出版日期2013-4
• 单位华南理工大学