电力系统最近电压崩溃临界点的确定

Computation of Closest Voltage Collapse Point in Power System

通过静态模型对动态模型的有效模拟,对最近电压崩溃临界点的计算方法进行了适当的改进。按照系统的鞍结分叉点处的左特征向量来控制系统的行为可以最快地远离电压崩溃点。采用Lanczos法求取特征值和特征向量,该方法比常用的逆迭代法精度高、运算量小。方法的有效性已在IEEE-5节点系统、约定考核题Ⅱ测算中得到证明。

An effective simulation of dynamic power system models is made via static power system model in this paper.It makes the static power system model and the dynamic one have the same saddle node bifurcation point.Under the condition of suitable formulation,the power system can be away from the voltage collapse point,through controlling the left eigenvector of voltage collapse point.The Lanczos method is used to obtain its eigenvalue and eigenvector.The computations show that Lanczos method has a higher precision and efficiency than the conventional converse iteration method.The method has been tested on two systems (standard IEEE 5-bus system and appointed examining bus system II).The result shows that the improved iterative method is very efficient.