重合闸与低电压穿越相配合的有源配电网故障恢复方案

A fault recovery scheme cooperating with reclosing and LVRT for active distribution network

分布式电源的接入给配电网的运行方式带来了较大影响,同时也使配电网对故障恢复方案提出了更高的要求。通过对配电网重合闸和分布式电源处电压变化的分析,考虑重合闸对DG低电压穿越的影响,提出了一种重合闸与低电压穿越相配合的有源配电网的故障恢复方案。该方案预先对分布式电源划分计划孤岛区域,并根据故障位置、孤岛区域以及分布式电源处电压变化等不同故障情况对有源配电网实施不同的供电恢复方法。最后通过PSCAD模型仿真验证了所提方案的可行性和有效性。

The integration of distributed generation brings great change to the operation mode of the distribution network,and higher requirements have also been set for the fault recovery scheme.By analyzing the relationship between fault reclosing and voltage variation of the distributed generation in distribution network and considering the influence of reclosing on LVRT of DG,this paper proposes a new fault recovery scheme cooperating with reclosing and Low Voltage Ride Through(LVRT)for active distribution network.The planned isolated island area is divided in advance for each DG,and different fault recovery methods are implemented according to the different fault conditions of the fault location,the isolated island area and the voltage variation of the distributed generation.The feasibility and effectiveness of the proposed scheme are verified by simulation in PSCAD.