基于多种指标优化的连锁故障预防策略研究

为了预防连锁故障的发生，兼顾电网运行时的安全裕度和电压稳定情况，将电网当前运行与临界状态的节点注入功率之间的差值转化为安全裕度指标；分别将衡量电网整体和某节点电压稳定的雅可比矩阵最小特征值指标和电压稳定的L指标相结合，给出了电压稳定的综合指标；结合电网实际情况给出了各种约束条件，由此确定了完整的预防连锁故障模型；提出了监控优化过程中电网切除初始故障后的剩余支路所受潮流转移的影响程度是否在降低，从侧面证明了文中提出的预防连锁故障模型能够达到预防连锁故障的目的；通过对IEEE39节点系统进行算例仿真，验证了所构建的预防连锁故障模型的可行性和有效性． 

Research on prevention strategy of cascading failures based on multi index optimization

To prevent cascading failures, safety margin and voltage stability of power grid in operation must be fully considered．Here we propose to convert difference between injected power of node in current operating state of grid and injected power of node in critical state into a safety margin index．We propose to combine minimum eigenvalue index of Jacobian matrix (to measure overall voltage stability of power grid) and L index (to measure voltage stability of a node in power grid), to give a comprehensive voltage stability index．Various constraints are given, in combination with actual situation of power grid, thereby determining a complete cascading failure prevention model．The optimization process should be monitored,to see whether effects of power flow transfer in remaining branchs after the initial failure of power grid are decreasing．The cascading failure prevention model proposed here is proved to be effective．This paper verifies the feasibility and effectiveness of the constructed model for preventing cascading failures by simulation of IEEE39 node system．