【摘要】 基于对临界电压和临界功率在静态电压稳定极限的作用的分析，本文提出以系统或节点所能承受负荷功率变化的能力来衡量无功率补偿对电压稳定作用的观点．从而得出无功补偿有利于系统电压稳定的结论，文章特别讨论了并联电容器的作用，指出当并联电容器用作无功补偿的同时增大节点负荷的无功注入时，其结果会导致潮流方程雅可比矩阵的奇异点及其对应的最小模特征值过零点与极限功率的临界点可能不一致，但它只会影响潮流的收敛性．在总注入不变前提下并不影响系统的静态电压稳定极限，然而从负荷角度来讲它抗拒扰动的能力加强了，因而并联电容对电压稳定是有利的．更多还原

【Abstract】 Baseb on the analysis of the effect of the critical voltage ane thd critical power on the static voltage stability limit, this paper proposes a criterion for measuring the voltage stability, that is the ability of the System or the bus which can withstand thd load variation. This comes to a conclusion that the reactive compensation always benefits the voltage stability in power system. This paper discusses the effect of the shunt capacitance, which causes the variations of the singularity and the smallest module eigenvalue of Jacobian matrix, and some attractive conclusions are drawn out in the paper.更多还原