电网戴维南等值参数的快速计算

Fast Computation of Thevenin Equivalent Parameters

提出一种电网在基态和N-1状态下戴维南等值参数的快速计算方法,并在此基础上对负荷节点进行电压稳定分析。通过推导的非线性方程组,运用电网基态和N-1状态下的节点电压和电压灵敏度的数值,可求得2种状态下的戴维南等值参数。不同于两点潮流或其他多点潮流方法,该方法只需要给定运行点的节点电压和节点电压灵敏度数据,计算简单快速。利用求得的等值参数可求得该节点的阻抗模指标和最小奇异值来快速分析负荷节点的电压稳定性。IEEE14和IEEE118节点系统的计算仿真验证此方法的正确性和实用性。

A fast computation method of Thevenin equivalent parameters when power system under base and N-1 topology is proposed. Based on the Thevenin equivalent parameters, voltage stability analysis of the load bus can be calculated quickly. On the base of the nonliear equations, Thevenin equivalent parameters under both base and N-1 topology can be calculated by using the value of node volatage and voltage sensitivity. This method only uses the value of voltage and voltage stability at a given time,which is different to the two point power flow method and the other similar method,the computation is simple and fast.The impedance module indicator and the minimum singular value of the study load bus can be calculalted with the Thevenin equivalent parameters, so voltage stability of the study bus can be analyzed.Tests on IEEE 30-bus and IEEE llS-bus systems verify the correctness and practicability of this method.