基于直流电流反馈的MMC-HVDC系统的中高频振荡抑制策略  

Mid-and High-Frequency Oscillation Suppression Strategy for MMC-HVDC System Based on DC Current Feedback

作　　者：辛业春 李尚轩 王延旭 朱益华 余佳微 常东旭 XIN Yechun;LI Shangxuan;WANG Yanxu;ZHU Yihua;YU Jiawei;CHANG Dongxu(Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology,Ministry of Education(Northeast Electric Power University),Jinlin 132012,China;State Key Laboratory of HVDC,China Southern Power Grid Electric Power Research Institute Co.,Ltd.,Guangzhou 510663,China;National Energy Power Grid Technology R&D Centre,Guangzhou 510663,China)

机构地区：[1]现代电力系统仿真控制与绿色电能新技术教育部重点实验室(东北电力大学),吉林吉林132012 [2]直流输电技术全国重点实验室(南方电网科学研究院有限责任公司),广东广州510663 [3]国家能源大电网技术研发(实验)中心,广东广州510663

出　　处：《中国电力》2025年第1期39-49,共11页Electric Power

基　　金：直流输电技术国家重点实验室开放基金资助项目(高比例新能源电网惯量在线评估及频率稳定协调控制技术,SKLHVDC-2022-KF-07)。

摘　　要：基于模块化多电平换流器的柔性直流输电(modular multilevel convertor based high voltage direct current,MMC-HVDC)系统存在的中高频振荡问题严重危胁电力系统的正常运行。首先,基于MMC的动态相量模型,建立了MMC的交流侧阻抗模型;其次,利用阻抗法分析控制环节及控制参数对MMC阻抗特性的影响,得到了功率外环、电流内环及控制链路延时是导致MMC呈现负阻尼特性的主要原因;再次,在分析现有基于电压前馈环节和电流内环的协同振荡抑制策略不足的基础上,提出了功率外环附加直流电流反馈的振荡抑制策略,极大程度消除系统中的谐波分量,改善了MMC的阻抗特性;最后,通过电磁仿真软件验证理论分析和抑制措施的正确性与有效性。The serious mid-and high-frequency oscillation issue in modular multilevel convertor based high voltage direct current(MMC-HVDC)systems poses a significant threat to the normal operation of power systems.In this paper,we firstly established an AC-side impedance model of the MMC based on its dynamic phase vector model.Secondly,we analyzed the impact of control loops and control parameters on MMC impedance characteristics using the impedance method,and identified the power outer loop,current inner loop and control loop delay as the main factors causing MMC to present negative damping characteristics.And then,based on an analysis of the limitations of existing oscillation suppression strategies that are based on voltage feedforward loops and current inner loops,we proposed an oscillation suppression strategy that adds DC current feedback to the power outer loop,which can greatly eliminate harmonic components in the system and improve MMC impedance characteristics.Finally,the correctness and effectiveness of the theoretical analysis and proposed suppression measures were verified through electromagnetic simulation software.

关 键 词：模块化多电平换流器 稳定性分析 中高频振荡 振荡抑制 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM712