基于风险的低压切负荷量的确定方法

Risk Based Determination of Under Voltage Load Shedding Amount

针对低压减载方案中切负荷量的问题,利用马尔可夫方法,计算出低压减载方案各种动作情况的概率。在此基础上,结合电压崩溃的风险理论,以在预想事故下所切负荷量为变量,构造方案引入所带来的电压崩溃风险的函数,再以该风险量最小为标准,确定切除负荷量的多少。与传统方法不同,该方法综合分析了各种意外事件、考虑了低压减载方案本身的可靠性。计算处理的信息更丰富,结果更准确。IEEE 14节点的算例表明了该方法计算的有效性。该方案为低压减载方案的设计提供了参考。

In order to determine the amount of under voltage load shedding （UVLS）, Markov method is used to calculate the probabilities of various operations of UVLS schemes. Based on this approach, and considering voltage collapse risks, the voltage collapse risk index can be constructed. This risk index uses the amount of load shedding as variable under expected contingency cases. Using the minimum of this risk as criteria, the amount of load shedding can be determined. Different with traditional methods, this one is obtained based on a full-scale contingencies analysis and consideration of under voltage load shedding scheme reliability. The calculation information is more comprehensive and the result is more accurate than traditional ones. IEEE 14-bus example reveals the effectiveness of this method. It can provide a useful reference for the design of under voltage load shedding schemes.