摘要
故障清除后模块化多电平换流器(modular multilevel converter,MMC)的快速恢复技术是柔性直流配电技术的重要研究内容。本文针对子模块混合型MMC故障后由于子模块电容电压不均导致的故障恢复过电流问题,提出了一种桥臂过电流抑制策略,避免解锁过程中桥臂子模块过电流的发生,使得解锁过程能够稳定可靠进行;在此基础上,还研究了基于桥臂电流前馈的子模块电容电压快速均衡方法,可促进换流器解锁时桥臂子模块电容电压快速重新稳定至额定值,有利于提高换流器直流侧电压恢复速度;最后,在MATLAB/Simulink环境中搭建了单端混合型MMC仿真模型,验证了所提控制方法的有效性和可行性。
The rapid recovery technology after fault clearing based on modular multilevel converter is an important research content of flexible DC power distribution technology.For the sub-module hybrid MMC,a bridge arm overcurrent suppression strategy is proposed to avoid the occurrence of secondary overcurrent of the bridge arm,so that the unlocking process could be carried out stably and reliably;at the same time,a fast sub-module capacitor voltage equalization method based on bridge arm current feedforward is studied.The recovery control could also ensure that the capacitor voltage of the sub-module of the bridge arm is quickly stabilized to the rated value when the converter is unlocked,which greatly improves the recovery speed of the converter.Finally,a single-ended hybrid MMC simulation model is built in MATLAB/Simulink to verify the effectiveness and feasibility of the proposed control method.
作者
史明明
刘瑞煌
袁宇波
张宸宇
袁晓冬
喻建瑜
SHI Mingming;LIU Ruihuang;YUAN Yubo;ZHANG Chenyu;YUAN Xiaodong;YU Jianyu(Electric Power Science Research Institute,State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 211103,China)
出处
《电力科学与技术学报》
CAS
CSCD
北大核心
2023年第5期121-128,共8页
Journal of Electric Power Science And Technology
基金
国网江苏省电力有限公司科技项目(J2021027)。
关键词
混合型MMC
故障闭锁
过电流抑制
故障恢复
子模块电容电压
hybrid MMC
fault blocking
overcurrent suppression
fault recovery
capacitor voltage of submodule
