MMC-HVDC联接变压器励磁涌流机理及抑制方法研究  

Research on the Mechanism and Suppression Method of Magnetizing Inrush Current of MMC-HVDC Connection Transformer

作　　者：杨洁民[1] 张彦良 张宇[1] YANG Jiemin;ZHANG Yanliang;ZHANG Yu(Tianshengqiao Bureau of CSG EHV Power Transmission Company,Guizhou Xingyi 562400,China)

机构地区：[1]中国南方电网超高压输电公司天生桥局,贵州兴义562400

出　　处：《广西电力》2024年第5期1-8,共8页Guangxi Electric Power

摘　　要：以鲁西背靠背换流站模块化多电平直流输电系统(Modular Multilevel Converter Based High Voltage DirectCurrent System,MMC-HVDC)为背景,介绍了2020年5月至6月MMC-HVDC联接变压器多次出现的励磁涌流,通过分析模块化多电平换流器(Modular Multilevel Converter,MMC)对联接变压器空载合闸的影响,提出联接变压器空充阶段阀侧简化模型,推导出联接变压器空载选相合闸后各相铁心磁通的表达式,根据推导出的表达式对现场多次励磁涌流情况进行了解释,提出适用于MMC-HVDC联接变压器的空充策略以抑制励磁涌流,并经仿真验证理论推导的正确性和所提方案的有效性。Based on the Modular Multilevel Converter Based High Voltage Direct Current System(MMC-HVDC)at Luxi's back-to-back converter stations,the multiple magnetizing inrush currents of MMC-HVDC connection transformer from May to June 2020 are introduced.The influence of MMC on the no-load closing of the connection transformer is analyzed.A simplified model of the valve side in the no-load charging stage of the connection transformer is proposed.The expression of the core flux of each phase after the no-load phase selection and closing of the connection transformer is derived.Based on the derived expressions,the situation of multiple magnetizing inrush currents in the field is explained,and the no-load charging strategy suitable for MMC-HVDC connection transformer is proposed to suppress the magnetizing inrush current.Simulation results verify the correctness of theoretical derivation and the effectiveness of the proposed scheme.

关 键 词：MMC-HVDC 联接变压器 励磁涌流 选相合闸 铁心磁通 

分 类 号：TM721.1[电气工程—电力系统及自动化]