高压电器2025，Vol.61Issue(8)：176-185,10.DOI:10.13296/j.1001-1609.hva.2025.08.023
阀塔寄生参数和子模块等效阻抗对预充电MMC均压特性的影响
Influence of Valve Tower Parasitic Parameter and Equivalent Impedance of Submodule on Grading Characteristics of Pre-charged Modular Multilevel Converter
摘要
Abstract
As for the voltage grading effect deterioration of submodule capacitor during the pre-charging process of the modular multilevel converter,a submodule-level refined valve tower simulation model,including the equivalent impedance of submodule absorption power supply,parasitic capacitance of valve tower and water resistance,is set up based on the grading characteristics of capacitive voltage of the submodule during the charging process of convert-er uncontrolled rectifier.The unevenness of submodules under different parameters is calculated,and the influence mechanism of energy obsorption power supply deviation,accuracy of grading resistor and water conductivity on the grading effect of sub-modules is analyzed.It is found by the research that the different charging currents due to the differences in submodule parameters,and the current to earth due to the parasitic parameters of the valve tower are the main factors that cause the deterioration of the grading effect of the submodule during pre-charging period.The grading resistor can provide a discharge path for the charge so that the charge is transferred from the sub-module with higher voltage to that with lower voltage,which helps to balance the capacitive voltage of each submodule.The re-search results can provide a theoretical basis for optimizing the operating condition and performance index of the gra-dign resistor of the modular multilevel converter.关键词
模块化多电平换流器/不控整流充电/子模块均压劣化/阀塔寄生参数/子模块等效阻抗/均压电阻Key words
modular multilevel converter/uncontrolled rectifier charging/grading deterioration of submodule/valve tower parasitic parameter/equivalent impedance of submodule/grading resistance引用本文复制引用
王振,徐海博,郑润民,肖凯,许琳浩,蔡志宏,牛戈钊,张梦楠,刘梦琦,刘琦..阀塔寄生参数和子模块等效阻抗对预充电MMC均压特性的影响[J].高压电器,2025,61(8):176-185,10.基金项目
中国南方电网有限责任公司科技项目(CGYKJXM20220356). Project Supported by Science and Technology Project of CSG(CGYKJXM20220356). （CGYKJXM20220356）
