电力系统自动化Issue(7)：182-187,6.DOI:10.7500/AEPS20140513006
采用模块化多电平换流器的统一电能质量控制器预充电控制
Pre-charging Control for Unified Power Quality Conditioner Based on Modular Multilevel Converter
摘要
Abstract
The unified power quality conditioner based on modular multilevel converter (MMC-UPQC) is a comprehensive compensator for power quality in medium and high voltage distribution systems.The precondition of normal work of devices is completing the pre-charging process on the premise of ensuring safety.According to the mathematical modeling and analysis of the three stages in the pre-charging process (the uncontrollable rectification stage,the submodular voltage promotion stage in series converter and the controllable rectification stage),it is believed that the largest impact current will flow through the anti-paralleled diode paralleled with DC capacitor in submodules in the uncontrollable rectification stage.In the voltage promotion stage of submodules in series converter,current-limiting resistance still plays the key role in limiting the impact current which is less violent than the current in the uncontrollable rectification stage.Then,a pre-charging control strategy for MMC-UPQC is proposed.The digital simulation and low-voltage experimental prototype have verified the validity and feasibility of the control strategy proposed.关键词
统一电能质量控制器/模块化多电平换流器/预充电/控制策略Key words
unified power quality conditioner(UPQC)/modular multilevel converter(MMC)/pre-charging/control strategies引用本文复制引用
龙云波,徐云飞,肖湘宁,徐永海,袁敞,陈国富..采用模块化多电平换流器的统一电能质量控制器预充电控制[J].电力系统自动化,2015,(7):182-187,6.基金项目
国家科技支撑计划资助项目(2011BAA01B03).@@@@This work is supported by National Key Technology R&D Program of China （2011BAA01B03）
