大型双馈式风电变流器的短路保护

Research on Converter Short Circuit Protection for Large Doubly-fed WindTurbine

双馈式风电变流器运行于特殊工况,常规的过流保护措施只能满足双馈变流器在特殊工况下的部分过流保护要求,应在常规过流保护的基础上,运用新的短路保护措施,才能使变流器在外部出现短路情况时,保护自身免受损害,而当变流器内部发生短路时,能及时切除故障支路,不使故障扩大。以此目标为基础,本文对双馈式风电变流器短路保护的特殊性及其措施进行了初步探讨。

The converter applied in the doubly-fed wind-turbine operate in particular conditions. The conventional overcurrent protection cannot fully meet the requirement of double-fed converter in special conditions. It required new method of short circuit protection in order to prevent the converter from damage in external short circuit conditions and internal short circuit conditions. The converter can timely remove the fault sub-circuit in external short circuit conditions and internal short circuit condition, which can keep itself safety. The short circuit protection of doubly-fed wind-turbine’s converter is preliminary studied in this paper which base on the anterior target.