含逆变型分布式电源的不平衡配电网快速短路电流计算  

Fast Short-circuit Current Calculation for Unbalanced Distribution Network with IIDGs

作　　者：李潇雨 何晋[1] 李智轩 孔玲玲[1] 周石金 LI Xiaoyu;HE Jin;LI Zhixuan;KONG Linging;ZHOU Shijin(School of Electrical and Information Technology,Yunnan Minzu University,Kunming 650504,China;Siemens Transformer(Wuhan)Co.,Ltd,Wuhan 430415,China)

机构地区：[1]云南民族大学电气信息工程学院,昆明650504 [2]西门子变压器(武汉)有限公司,武汉430415

出　　处：《电力系统及其自动化学报》2024年第3期75-86,共12页Proceedings of the CSU-EPSA

基　　金：国家自然科学基金资助项目(52061042);云南省教育厅科学研究基金资助项目(2022Y454)。

摘　　要：为实现含逆变型分布式电源的不平衡配电网快速短路电流计算,首先建立计及故障穿越控制的逆变型分布式电源序等效受控电流源模型,通过引入虚拟线路和虚拟节点并结合广义Fortescue变换建立不平衡配电网的系统序导纳矩阵。在此基础上构建含逆变型分布式电源不平衡配电网的序节点电压方程,提出基于序分量的短路电流迭代计算方法。通过引入预条件处理的广义极小残余法可避免求解系统序阻抗矩阵,能够有效提升短路电流迭代计算的计算速度。最后,通过对含逆变型分布式电源的13节点、123节点和多个大型合成系统仿真结果对比,验证了所提方法的正确性和可行性。A fast short-circuit current calculation method for unbalanced distribution network with inverter-interfaced distributed generators(IIDGS)is studied in this paper.First,the IIDG sequence equivalent controlled current source model is established considering fault ride-through control,and the system sequence admittance matrix of unbalanced distribution network is established by introducing dummy lines and dummy nodes,with the combination of a generalized Fortescue transform method.On this basis,the sequence node voltage equation for unbalanced distribution network with IIDGs is constructed,and an iterative calculation method for short-circuit current based on the sequence component is proposed.The generalized minimal residual algorithm for preconditioning is introduced to avoid solving the system sequence admittance matrix,thus effectively improving the computational speed of iterative calculation of short-circuit current.Finally,the correctness and feasibility of the proposed approach are verified by comparing the simulation results of 13-node and 123-node systems with IIDGs and several large synthetic systems.

关 键 词：逆变型分布式电源 不平衡配电网 短路电流计算 广义Fortescue变换 广义极小残余法 

分 类 号：TM7[电气工程—电力系统及自动化]