期刊论文

Energy Balancing Control Strategy of MMC-HVDC under AC Fault

中文

湖南大学学报(自然科学版)

1674-2974

2019

46

10

101-108

10.16339/j.cnki.hdxbzkb.2019.10.012

国家自然科学基金资助项目（51977014）； 湖南省自然科学基金资助项目（2018JJ4025）~~；

本校为第一机构

针对模块化多电平换流器(Modular Multilevel Converter,MMC)的柔性直流输电系统(MMC-HVDC)在交流侧故障下的常规控制方法存在换流器内部能量难以快速控制,交流侧故障导致各桥臂间能量可能出现不平衡等问题.从换流器内部机理的控制角度出发,提出了基于能量平衡控制的MMC控制方法,该方法通过优化控制MMC各桥臂电流分量来调节换流器桥臂间的功率流向,实现交流侧电流与换流器内部能量的协同控制,有效抑制换流器在系统故障过程中所引起的内部能量不均衡过程.最后,通过MATLAB/Simulink平台搭建了37电平MMC-HVDC仿真模型,仿真结果验证了所提出控制策略的有效性.

Since it is difficult to quickly control the internal energy of the converter,which may cause problems such as unbalanced energy between the arms in the modular multilevel converter based high voltage direct current(MMC-HVDC) system,this paper proposes a control strategy of MMC based on energy balancing control from the internal mechanism of the converter,optimizing the control of the current components of each arm.The control strategy can realize the coordinated control of the AC side current and the internal energy of the converter,and effectively reduce the internal energy unbalanced proces...