含换流器型分布式电源配电网的不对称短路电流计算方法OA北大核心CSTPCD

To meet the general requirements for asymmetric short-circuit calculation in distribution networks,a study is conducted on the calculation method with inverter-based distributed generation(IBDG),considering the diverse characteristics of asymmetrical short-circuits caused by IBDG.This method establishes a universal model that is applicable to the equivalent of IBDG asymmetric short-circuit positive and negative sequences with various control objectives.The establishment of this model is based on the principle of positive and negative sequence current control with IBDG asymmetric short-circuit and the short-circuit current output characteristics with different control objectives,as well as the specific requirements of low voltage ride-through and current limiting control for IBDG output asymmetric short-circuit current.Based on this model,a universal asymmetric short-circuit equivalent circuit and calculation equation are established,and a general calculation process for short-circuit current occurring at any node of the distribution network with any asymmetric short-circuit for multiple IBDG control objectives is obtained.Finally,the proposed method is verified in a distribution network example,and the results show that the proposed method is correct and effective.