电力系统自动化2016，Vol.40Issue(21)：34-39,6.DOI:10.7500/AEPS20160621009
MMC静态直流充电时电容均压特性研究和保护定值整定
Voltage-sharing Characteristics and Protection Value Setting of Modular Multilevel Converter at Static DC Charging State
摘要
Abstract
A common problem in the static DC charging process of modular multilevel converter is voltage polarization.Some sub-modules”voltage sags even cause startup and shutdown repeatedly.In order to analyze the voltage-sharing characteristics of MMC,firstly,equivalent impedance of energy-absorbing source is introduced into the simulation model of sub-module;secondly,the mechanism of voltage polarization is studied based on the improved model;finally,a setting process of static DC charging tolerance time protection is proposed which can reduce the degree of voltage polarization.The static DC charging experiment and single tower test are conducted at Xiamen HVDC flexible transmission project and the results show consistence between simulation and experiment,which prove the feasibility of the improved simulation model of the sub-module,the mechanism analysis result of voltage polarization,the correction of static DC charging tolerance time protection value setting method.关键词
模块化多电平换流器/均压/保护定值整定/静态直流充电Key words
modular multilevel converter/voltage-sharing/protection value setting/static DC charging引用本文复制引用
李超,唐志军,林国栋,邹焕雄,翟博龙,陈锦山..MMC静态直流充电时电容均压特性研究和保护定值整定[J].电力系统自动化,2016,40(21):34-39,6.基金项目
国家电网公司科技项目(52130415000Z)。@@@@This work is supported by State Grid Corporation of China(No.52130415000Z) （52130415000Z）
