分析了分布式发电(DG)对所在线路保护选择性和灵敏性的影响,阐述了采用限流器方式解决DG正向和反向助增电流对保护选择性的影响,提出了一套完整的选取限流阻抗以及修改保护定值的方案,并通过实例分析证明了方案的可行性.
This paper studies the impact of DG injection to the selectivity and sensitivity of protections, and describes the effect of adopting fault current limiters (FCL) technique in solving the forward and inverse current problems to the selectivity of protection. It puts forward a complete set of scheme for choosing impedance value of FCLs and modifying the protection settings. Examples show the feasibility of the scheme.