Wind power is one of the main forms of renewable energy generation. Safe operation of wind farms is of significant importance to the reliable operation of modern electrical systems. China has successively established multiple large-scale wind power bases in regions such as Inner Mongolia, Hebei, and southeastern coastal areas. The protection of collector lines in wind farms commonly employs traditional overcurrent element. However, with this method, a fault at any point along the collector lines could result in the entire line being disconnected, resulting in the interruption of renewable energy absorption, power outage for un-faulted areas and long outage recovery duration. This paper analyzes the characteristics of collector line faults, and then proposes a new collector line protection scheme based on localized protection principle. Electromagnetic transient program is used to verify the effectiveness of the proposed protection scheme.

renewable energy,wind farm,localized protection,collector line protection,doubly-fed induction generators