电力系统静态电压稳定与节点阻抗解析

通过一简单两节点系统,证明节点最大功率总是发生在节点负荷等值阻抗模与电源侧等效阻抗模相等的时候,而与负荷的功率因数无关,但负荷的功率因数决定临界功率的大小.分析PV曲线下半支稳定性及其与节点负荷等值阻抗模的关系,指出在以比较节点负荷等值阻抗模与临界阻抗模来判别系统电压稳定性时应考虑节点的负荷特性.

Static voltage stability and node impedance analysis in power systems

Based on a simple two-node system, it was proved that the maximum power of nodes always occurred when the equivalent impedance module of the nodes was equal to that of the system. It was independent of the load power. However the critical power was dependent upon the load power. The stability of the low part of P-V curves as well as its relationship with the equivalent impedance module of loads was analyzed. A conclusion is drawn that the load characteristic should be considered when the voltage stability of power systems is evaluated by comparing the equivalent impedance module of nodes with their critical impedance module.