含逆变型分布式电源的不平衡配电网短路电流计算方法研究  

Calculation Method of Short-circuit Current in Unbalanced Distribution Network with Inverter-based Distributed Generation

作　　者：邓成江 李海锋[1] 曾德辉[1] 肖瑞超 王钢[1] DENG Chengjiang;LI Haifeng;ZENG Dehui;XIAO Ruichao;WANG Gang(South China University of Technology,Guangzhou 510641,China)

机构地区：[1]华南理工大学,广东广州510641

出　　处：《智慧电力》2021年第2期39-46,共8页Smart Power

基　　金：国家自然科学基金资助项目(51977080)。

摘　　要：逆变型分布式电源(IBDG)的输出由其控制策略决定而具有很强的非线性,使传统配电网的短路电流计算方法不再适用,而配电网的不对称更是进一步增加了其短路计算的难度。根据对称分量法推导出不平衡配电网的故障点各序电流,提出一种基于序网络迭代修正的不平衡配电网短路电流计算方法,在每一次迭代中,根据当前节点各序电压分别修正IBDG的输出电流和各不对称元件补偿电流源的输出电流,利用节点电压方程得到新的节点各序电压和故障点各序电流,直到满足收敛条件。最后,基于PSCAD/EMTDC对含IBDG不平衡配电网的进行了仿真计算,验证了所提方法的准确性和有效性。The output of inverter-based distributed generator(IBDG)is determined by its control strategy and has a strong nonlinearity,making the calculation method of short-circuit current in traditional distribution network no longer applicable.Moreover,the asymmetry of distribution network further increases the difficulty of its short-circuit current calculation.To this end,the sequence current of fault points in unbalanced distribution network is deduced according to symmetrical component method.On this basis,a short-circuit current calculation method of the unbalanced distribution network is proposed based on the iterative correction of sequence network.In each iteration,the output current for IBDG and the compensation current source of each asymmetric component are respectively corrected according to the sequence voltage of the current node,then nodal voltage equation is used to get the new nodal sequence voltage and sequence current of the fault points,until the convergence condition is satisfied.Finally,based on PSCAD/EMTDC,the simulation calculation of the unbalanced distribution network with IBDGs is carried out,and the accuracy and effectiveness of the proposed method is verified.

关 键 词：逆变型分布式电源 对称分量法 不平衡配电网 短路电流计算方法 

分 类 号：TM744[电气工程—电力系统及自动化]