分布式电源接入对变电站距离保护及重合闸的影响

Effect of DG on the distance protection and recloser of transformer substation

为研究分布式电源对所接入变电站继电保护的影响,以DG接入单电源配电网的110kV终端变电站为例,以故障点是否出现在系统电源进线段为切入点,通过分析DG接入对变电站线路短路电流增量的影响以及线路故障尚未切除时DG能够满足暂态稳定运行时间的长短,进而研究分布式电源的不同容量、不同接入方式对所接入变电站原有三段式距离保护及重合闸的影响,并通过EMTDC/PSCAD仿真加以验证。结果表明,分布式电源对所接入的变电站距离保护的影响主要取决于DG容量的大小及故障时DG失稳时间的长短,对重合闸的影响主要取决于故障点是否出现在系统电源进线段。

Taking a distributed generation connected to 110 kV terminal substation as an example,the impact of distributed generation capacity and connection mode on three-section distance protection and the recloser of substation is discussed from different aspects：the fault location,the short circuit current increment and the steady running time of DG after fault.Simulative results with EMTDC/PSCAD show that：DG has impact on the distance protection depending on its capacity and its steady running time,the impact of DG on the recloser depending on the place of the fault.