含风电场的配电网保护新方法

A novel protection method for distribution network with wind farm

考虑风电机组自身电流特性,将含风电场的辐射型配电网中风电场视作电流源,针对故障发生在风电场上游、下游时,分别建立相应的等效电路图,研究各线路保护装置检测到的故障电流特性;基于波形相关性算法,提出一种适用于含风电场的配电网保护方法及相应的WSN通信网络实施方案,该方法可以在风电场接入配电网的情况下准确识别故障线路。在PSCAD/EMTDC中搭建含风电场的典型配电网模型,仿真结果验证了所提出的配电网保护方法的正确性与可行性。

Considering the current characteristics of wind fa rm, the wind farm in the radial distr ibution networks was treated as current source in this paper. For the fault occurred at the up-stream or downstream of wind farm, the corresponding equivalent circuits were presented, and the fault current features in these conditions were studied. A novel correlation analysis based protection method and corresponding WSN communication network topology were proposed for distribution networks with wind farm. The proposed method could identify the fault line precisely while the wind farm was connected to the network. PSCAD/EMTDC simulation results show that the method is with high accuracy and feasibility.