故障电流转移型MMC的通用故障电流计算方法  

General Fault Current Calculation for Fault Current Transfer MMC

作　　者：邓伟成 许建中 DENG Weicheng;XU Jianzhong(State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources(North China Electric Power University),Changping District,Beijing 102206,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京市昌平区102206

出　　处：《电网技术》2022年第2期511-520,共10页Power System Technology

基　　金：国家重点研发计划项目(2018YFB0904600);国家自然科学基金项目(51777072)。

摘　　要：直流电网作为风电和光伏等新能源汇集的有效手段,其故障电流的计算对设备选型、保护设计、参数优化等工作具有重要意义。首先对需要源侧和网侧配合的故障清除方案进行特性分析,介绍了故障电流转移型模块化多电平换流器(modular multilevel converter,MMC)的基本原理。然后结合其故障穿越的具体过程,提出了一种故障电流转移型MMC的通用故障电流计算方法。为确保该类方案的优势最大化,提供了关键参数的设计依据。最后,在PSCAD/EMTDC上搭建了四端直流电网并验证了所提故障电流计算方法的有效性。结果表明:所提故障电流计算方案具有很高的计算精度,并且具备较好的通用性。As an effective means of the new energy collection such as wind power and photovoltaic,the DC power grid is of great significance for its equipment selection,protection design,parameter optimization,etc.in the calculation of fault current.Firstly,this paper analyzes the characteristics of fault clearing schemes which need the cooperation of the source side and the network side,and introduces the basic principles of the fault current transfer MMC.Then,combined with the specific process of the fault ride-through,a general fault current calculation method for the fault current transfer MMC is proposed.In order to maximize the advantages of such a scheme,the design basis of the key parameters is provided.Finally,a four terminal DC power grid is built on the PSCAD/EMTDC,and the effectiveness of the proposed fault current calculation method is verified.The results show that the proposed fault current calculation scheme has high calculation accuracy and good generality.

关 键 词：直流电网 网络等值 故障电流计算 故障自清除 

分 类 号：TM721[电气工程—电力系统及自动化]