光伏并网对配网继电保护的影响

Influence of Grid-Connected Photovoltaic Power Supply on Relay Protection of Distribution Network

摘要: 随着分布式光伏发电系统的接入，配电网由单电源电网转化为多电源电网，使得原电网中继电保护中短路电流增大、电流方向改变等影响，导致短路故障时可能引起保护的误动或拒动。本文以光伏电源通过10 kV馈线接入配电网为例，利用短路电流计算公式计算短路电流大小，分析了对馈线电流保护所带来的影响，得出馈线电流保护的影响程度与光伏电源的接入位置有关。

Abstract: With the access of distributed photovoltaic power generation system, distribution network sup-plied by single-ended power gradually has two port sources or multi-port sources, which result in fundamental changes to magnitude and direction of distribution network load flow, and failure to work correctly when short circuit happens. With an example of photovoltaic power supply paralleled into distribution network, this paper calculates the magnitude of short current by formula, and analyzes the effect of feeder line current protection and reclosing. The result shows that the influence to feeder line protection relates to positing of photovoltaic power supply.