Distribution system would be converted from single-source network into multi-source network while interconnecting wind power generator with original system, which would possibly cause failure and false operation of some original relaying protection system. To study transient impact of DFIG on original protection of distribution network , this paper has built a complete real-time dynamic stimulation platform based on RTDS stimulation system. Then, it has analyzed the impact of DFIG on operation behavior of over-current protection when short circuit oc-curred at upstream and downstream of DFIG and feeders nearby. It provided foundation to study on relaying protection algorithm of distribution network after DFIG merged into. The result of stimulation demonstrates that DFIG provides certain short-circuit current to short circuit point and has different influence on original Distribution system protection according to different place of short circuit point.%研究风力发电的接人,配电网由单电源转化为多电源网络,原有的某些继电保护系统可能会出现拒动或误动问题.为研究双馈风电机组(DFIG)对原有配电网保护的影响,为保护电网的安全,根据RTDS仿真系统建立了完整的DFIG实时仿真平台.仿真分析了DFIG并入配电网后,在发生故障时,DFIG会对原有配电网过流保护.仿真结果表明,DFIG将向短路点提供一定的短路电流,并根据短路点的不同位置,会对配电网起到保护作用.
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