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提出了一种静止同步串联补偿器(static synchronous series compensator,SSSC)混合模型,推导了电力系统中加入SSSC模型后的潮流方程。在潮流计算和奇异值分解的基础上,构建了基于SSSC混合模型和奇异值分解的电压稳定性弱节点判别指标及最危险负荷增长方式指标。利用奇异值分析法,深入分析了在负荷平均增长和最灵敏节点负荷增长2种情况下,SSSC对电力系统电压稳定性的影响。研究了采用弱节点判别指标和最危险负荷增长方式指标确定系统最薄弱节点和负荷增长最快节点的方式。证明了在系统最薄弱节点和负荷增长最灵敏节点线路中加入SSSC后能提高电力系统电压稳定性。对IEEE14节点系统进行了仿真计算,验证了所构建的SSSC混合模型以及2个电源稳定性分析指标的可行性、有效性和适用性。
A hybrid model of static synchronous series compensator (SSSC) is proposed and the power flow equations after SSSC model is derived. On the basis of power flow calculation and singular value decomposition, the discriminant index and the indicator of the most dangerous load growth mode based on SSSC hybrid model and singular value decomposition are established. By means of singular value analysis, the influence of SSSC on the voltage stability of power system is analyzed deeply in two cases: average load growth and maximum load increase of node. The method of using the weak node discriminant index and the most dangerous load growth index to determine the weakest node and the node with the fastest load growth is studied. It is proved that the addition of SSSC to the system’s weakest nodes and the most sensitive nodes in load growth can improve the power system voltage stability. The IEEE 14-bus system is simulated and the feasibility, validity and applicability of the SSSC hybrid model and the stability analysis of two power sources are verified.