分布式光伏发电对配电网保护的影响

Impact of Distributed Photovoltaic Generation on Relay in Distribution Network

分布式光伏发电接入配电网将影响馈线保护的灵敏性和选择性。文章研究了分布式光伏发电接入配电网后的保护方案,给出了不同情况下对短路电流产生助增或削减作用的理论分析方法。基于放射式配电网络、恒阻抗负荷模型,并将故障下的分布式光伏发电等效为受控电流源,进行了分布式光伏发电对配电网短路电流影响的仿真,仿真结果验证了理论分析的正确性。

Sensitivity and selectivity of relay protection are influenced by distribution network grid-connected distributed photovoltaic generation. Therefore, a protective approach was studied in response to this problem and then a theoretical analysis method was provided for increasing or reducing fault current under different situations. Based on radial distribution network and constant impedance load model, taking distributed photovoltaic generation as a controlled current source, the impact of fault current of distributed photovoltaic generation on distribution network was simulated and then the correctness of the theoretical analysis was verified.