基于阻抗模裕度指标的动态无功补偿装置优化配置方法

Optimal Allocation Method of Dynamic Var Compensator Based on the Impedance Modulus Margin Index

基于非解析复变电力系统的动态分析方法,提出计及负荷特性的阻抗模裕度指标(impedance modulus margin index,IMMI)计算方法。其计算公式能够简单且直观地利用电力系统运行参数。IMMI能够准确地评估负荷节点电压稳定性的水平,从而判定电压稳定薄弱环节。在上述研究基础上,提出动态无功补偿装置优化配置的新方法。它能实现实时跟踪负荷节点的等值电路参数,动态的搜索动态无功补偿装置配置最佳位置。再综合考虑配置点的配置容量的确定原则,比较多种配置方案的效果与成本,得出最后动态无功补偿装置的优化配置方案。通过IEEE 14节点系统和广东电网某220 kV片区网络的案例说明了新方法更加直接有效。

Based on the theory of dynamic analysis method of non-analytic complex power system, this paper proposed a method to calculate the impedance modulus margin index （IMMI） of load node which considers the static characteristics of ZIP load. Its computation formula can be simple and intuitive use of the power ＇system operation parameters. Furthermore, IMMI can accurately assess the level of load node＇s voltage stability, so as to determine the relatively weak nodes of voltage stability. On the basis of the above research, a new optimal allocation method of dynamic var compensator was proposed. It can realize the real-time tracking of equivalent circuit parameters which look from the load node to system and dynamic search for the optimal location of dynamic var compensator. By considering the principle of determining the capacity and comparing the effects and cost of various configuration scheme, it is concluded that the optimized configuration scheme of dynamic var compensator. IEEE 14-node system and a 220 kV real grid in Guangdong were taken as cases to illustrate that the proposed method is more direct and effective.