含微电网的配电网分区综合保护

Comprehensive protection of distribution network partitions with microgrid

针对含微电网的配电网中潮流双向、故障特性复杂的问题,为双向潮流区域配置基于正序阻抗的差动保护。通过分析短路电流特性以及电网拓扑结构,将整个电网分为双向潮流区域、馈线区域、无影响区域,并为馈线区域配置基于筛选最大正序电流故障分量的保护,将无影响区域延用传统的阶段式电流保护,设计出3种保护方法分区工作综合保护的策略。最后,通过在MATLAB环境中搭建典型的含微电网的配电网模型,模拟各种短路工况,验证了分区综合保护策略的可行性。

Considering the problem that the power flow in the distribution network with microgrid is bidirectional and the fault characteristics are complex,the differential protection based on positive sequence impedance is built for the bidirectional tidal current region.By analyzing the characteristics of short-circuit current and the topology of the power grid,the whole power grid can be divided into bidirectional power flow region,feeder region,and non-influenced region.The feeder region is protected based on screening the protection of the largest positive-sequence current fault component,and the unaffected region follows the traditional swtaged current protection,thereby designing a comprehensive protection strategy for partition work based on three protection methods.By constructing a typical distribution network model with microgrid in MATLAB environment,tthe various short-circuit conditions are simulated,and the feasibility of comprehensive protection strategy of distribution network partitions is verified.