计及联络开关投切的有源配网电流速断保护定值优化方案

An Optimized Scheme for Active Distribution Network Current Speed Protection Setting Considering Tie Switch Operation

含联络开关的有源配电网网架结构复杂、运行方式变换频繁,给依赖于静态网络拓扑和固定运行方式的传统电流保护正确动作带来很大影响。对此,提出了一种电流速断保护定值优化方案,由配电终端实时监测开关量信息,上传主站获取拓扑关联矩阵,并结合光伏电源输出特性,自适应调整保护定值。该方案可以在考虑逆变型电源出力波动性的前提下,有效增强保护应对不同网络拓扑变化的能力,通信压力小。仿真结果表明:所提方案能有效增加I段保护范围,受分布式发电(distributed generator,DG)出力影响小,可以适应配网拓扑结构变化。

Active distribution grid with tie switches has a complex grid structure and undergo frequent changes in operation mode,which greatly affects the correct operation of traditional current protection that relies on static grid topology and fixed operation mode.A setting optimization scheme for instantaneous overcurrent protection is proposed,which monitors the switch status information in real-time by the terminal unit,uploads the topology correlation matrix to the master station,and combines the output characteristics of the inverter-type distributed power supply to adaptively adjust the protection settings.The scheme can effectively enhance the adaptability of the protection to the grid topology and the output fluctuation of the inverter-type power supply with low communication pressure.Simulation results show that it can effectively increase the instantaneous overcurrent protection range,reduce the impact of DG output and better adapt to grid topology changes.