大规模电力系统电压失稳区的确定方法

Determination of Voltage Collapse Areas in Large Scale Power System

本文基于扩展潮流方程雅可比矩阵的特征结构分析法，提出了一种确定大规模电力系统电压失稳区的计算方法。该方法可以明确地给出系统在指定运行工况下，全网最有可能发生电压不稳定或电压崩溃的区域以及与之相关的关键发电机和输电支路。从而为诸如低压减载方案的设计、无功补偿的配置和系统的运行调控提供直接的依据。实际电力系统计算结果表明，该方法具有物理概念清晰、计算简单快速。

This paper presents a new method for the determination of voltage collapse areas in large scale power systems. The method, based on the eigenvalue-eigenvector analysis of load flow Jacobian matrix, uses the bus parcitipations related to the smallest eigenvalue to determine which buses are largely associated with the weakest mode of voltage stability. The buses with high participations are considered as constituting the voltage collapse area for a given operation mode. Meanwhile, the branch and generator participations associated with the smallest eigenvalue, respectively, indicate which branches are important to the stability mode and which generators must retain reactive reserves to ensure the stability of the mode, and thus providing useful information regarding the mechanism of loss of voltage stability as well as the guidelines for the design of voltage collapse preventive controls. This proposed method is also compared with the conventional d V d Q method in a 39-node model system.