含负序电流注入IIDG的多相配电网短路电流计算  

Short-circuit Current Calculation for IIDG with Negative-sequence Current Injection in Multi-phase Distribution Network

作　　者：李智轩 何晋[1] 李维希 杨凡[2] LI Zhixuan;HE Jin;LI Weixi;YANG Fan(School of Electrical and Information Technology,Yunnan Minzu University,Kunming 650031,China;Chuxiong Power Supply Bureau,Yunnan Power Grid Company,Chuxiong 675000,China)

机构地区：[1]云南民族大学电气信息工程学院,昆明650031 [2]云南电网公司楚雄供电局,楚雄675000

出　　处：《电力系统及其自动化学报》2022年第11期32-41,共10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(2021Y654)。

摘　　要：逆变型分布式电源IIDG(inverter-interfaced distributed generators)的控制策略决定了其输出特性,而传统IIDG等效模型未能考虑IIDG三相输出电流不对称情况,具有局限性。通过分析IIDG故障电流与所采用控制策略之间的关系,建立了IIDG序分量等效模型;通过采用引入虚拟节点、虚拟线路以及补偿电流的方法,建立了不平衡多相配电网的序等效模型。在此基础上,构建含IIDG多相配电网的序节点电压方程,揭示IIDG输出电流和解耦补偿电流与对应节点电压的关系,由此提出了基于叠加定理的迭代修正短路电流计算方法。最后,通过仿真对比验证了所提计算方法的可行性和有效性。The control strategy for an inverter-interfaced distributed generator(IIDG)determines its output characteristics.However,the traditional equivalent model of IIDG is limited in that it does not account for the asymmetry of the IIDG three-phase output current.Based on the analysis of the relationship between the IIDG fault current and the adopted control strategy,the equivalent model of an IIDG with sequence components is established.Through the introduction of dummy nodes,dummy lines and compensation current,the equivalent model of each sequence in the unbalanced multi-phase distribution network is established.On this basis,the sequence node voltage equation of a multi-phase distribution network with IIDGs is constructed,and the relationship among the IIDG output current,decoupling compensation current and the corresponding node voltage is revealed.Accordingly,an iterative correction short-circuit current calculation method based on the superposition theorem is proposed.Finally,a comparison based on simulation is performed to validate the feasibility and effectiveness of the proposed calculation method.

关 键 词：多相配电网 逆变型分布式电源 负序电流注入 对称分量法 短路电流计算 

分 类 号：TM615[电气工程—电力系统及自动化]