一种关于静态电压稳定极限的工程改进计算方法

An improved engineering calculation method of static voltage stability limit

基于视在功率推导的静态电压稳定极限解析表达式,给出判别静态电压稳定薄弱点的指标,并提出一种关于静态电压稳定极限的工程改进计算方法。工程中主要采用电力系统仿真软件来计算静态电压稳定。该方法在稳定计算程序中模拟负荷增长,解决普通潮流算法中存在的静态电压稳定极限附近运行点潮流不易收敛造成的极限误判问题;在潮流计算程序中将区域内发电机PV节点修改为PQ节点,解决稳定计算程序由于计及发电机动态调节特性造成的无功出力超发问题。最后,以北京某分区电网为例,验证该计算方法的适应性。

Based on the analytical expression of the static voltage stability limit derived from apparent power,this paper gives an index to identify the weak point of static voltage stability,and proposes an improved engineering calculation method for the static voltage stability limit.The power system simulation software is mainly used in the project to calculate the static voltage stability.This method simulates the load growth in the stability calculation program,and solves the problem of limit misjudgment caused by the difficulty of the convergence of the operating point near the static voltage stability limit in the ordinary power flow algorithm.In the power flow calculation program,the PV node of the generator in the region is modified to a PQ node,which solves the problem of excessive output of reactive power caused by the dynamic calculation characteristic of the generator in the stable calculation program.Finally,a certain district power grid in Beijing is used as an example to verify the adaptability of the calculation method.