电力系统保护与控制2016，Vol.44Issue(6)：23-28,6.DOI:10.7667/PSPC150868
计及负荷电压静态特性的电力系统最小负荷裕度的快速评估
Rapid assessment of power system minimum load margin considering load voltage static characteristic
摘要
Abstract
Load margin is one of the most important index in static voltage stability, minimum load margin of nonlinear complex variable power system is defined. Power parameter is introduced using a dynamic equivalence method of nonlinear circuits, Lagrange function is constructed. It is proved the necessary condition of the maximum active power of nonlinear electric power network load node is that load static equivalent impedance mode is equal to dynamic equivalent impedance mode of load node, impedance modulus margin index is put forward which is used for assessing voltage stability. Under the same disturbance, the smaller the impedance module margin is, the weaker the voltage stability is, so the smaller the node load margin is. Therefore, the biggest load margin of the weakest node is calculated, it is minimum load margin. When impedance model margin of the weakest load node is zero, maximum active power is obtained and maximum load margin is calculated. Through simulation on IEEE30 nodes system under different disturbance ways considering load voltage static characteristic, it indicates that single node disturbance way and the increase of constant impedance and constant current load ratio improve minimum load margin of power system.关键词
复变/动态等值/负荷裕度/阻抗模裕度/电压静态特性Key words
complex variable/dynamic equivalence/load margin/impedance modulus margin/voltage static characteristic引用本文复制引用
朱永强,刘光晔,廖庭坚,雷强..计及负荷电压静态特性的电力系统最小负荷裕度的快速评估[J].电力系统保护与控制,2016,44(6):23-28,6.基金项目
国家自然科学基金资助项目(51577053) This work is supported by National Natural Science Foundation of China (No.51577053) （51577053）
