电力系统静态电压安全问题的概率评价

PROBABILISTIC EVALUATION TO STATIC VOLTAGE SECURITY OF POWER SYSTEMS

电压安全问题严重威胁电力系统的安全运行。根据作用时间和机理的不同 ,电压安全问题分为暂态安全和静态安全两个方面 ,后者包括静态电压稳定和静态电压偏移。文中将静态电压安全与概率充分性分析结合起来 ,研究在不同负荷水平下、考虑发电和输电元件随机故障时的静态电压安全问题 ,模拟有效的控制措施 ,建立量化的概率风险评价指标 ,给出了相应的算法流程 ,并以IEEE RTS为例 ,讨论了负荷模型对静态电压安全的影响以及静态电压安全对概率充分性的影响 。

Power system is now more and more vulnerable to voltage security problems, which are usually classified into two categories: transient and static voltage security, with the latter including static voltage stability and static voltage deviation. Network configuration, load level and forced outage of equipment have great effect on static voltage security. This paper deals with the static voltage security problem under stochastic circumstance, and applies the Monte-Carlo-sampling method to simulate the random forced outage of generation, transmission and protection facilities. It applies a K-means cluster based load model to reflect the random variation of bus load and builds a set of quantitative probabilistic indices to evaluate the voltage security. Relief correction measures are modeled and the numerical results of IEEE test system are presented and discussed.