考虑暂态过程仿真的连锁故障多时域演化模型

Multi-timescale Cascading Failure Evolution Model Considering Transient Process Simulation

在分析现有连锁故障演化模型不足的基础上,提出考虑暂态过程仿真的连锁故障多时域演化模型,并对连锁故障路径进行阶段性评估。首先,建立线路过负荷保护模型、发电机电压保护模型、线路状态转移模型和负荷时序波动模型,并按照不同扰动的时域特性对模型进行时域分类;其次,针对连锁故障演化的不同时域过程,分别建立暂态过程的暂态仿真模块,暂态过程向中长期过程过渡的潮流计算模块和中长期过程的稳态仿真模块,形成了连锁故障多时域演化模型;最后,以故障环节为评估对象,对连锁故障进行阶段性评估。用IEEE 39节点系统进行仿真计算,分析表明所建模型能够更加合理地模拟连锁故障演化过程,提高连锁故障演化模型的精确性,并揭示连锁故障的阶段性特征。

Based on the analysis of existing cascading failure evolution model’s shortcomings,the multi-timescales cascading failure evolution model is proposed considering transient process simulation.Phrasal evaluation of the cascading failure path is also conducted.First,overload protection of the transmission line,voltage protection of the generator,state transition of the transmission line and time sequence variation of the load are all modeled and categorized based on their timescale characteristics.To deal with the transient process,the medium to the transition process and the medium and long term process from the former to the latter and the the medium and long term process,modules of transient simulation,power flow calculation and steady state simulation are correspondingly established for each of the different time sequences within the cascading failure evolution process,forming the multiple time domain evolution model of cascading failures.Finally,phrasal evaluation of the fault links of the cascading failures is conducted.In this article,simulation and calculation are done using the IEEE 39 bus system.The results verify that the proposed model can not only obtain more reasonable simulation results of the cascading failure evolution process,but also improve the accuracy of the evaluation model of cascading failures and reveal phrasal characteristic of cascading failures.