摘要
模块化多电平换流器(MMC)传统的电压均衡控制需要对电容电压排序,排序运算的计算量降低了控制系统的响应速度。在分析冒泡原理基础上,提出一种快速电压均衡控制策略。每个控制周期内通过若干步冒泡运算分别得到投入、退出状态的电压最值子模块。当投入的子模块数量指令变化时,仅对最值子模块的开关状态进行改变。当投入和退出子模块电压差值超过电容电压允许偏差定值时,交换两者中越界的子模块开关状态。在PSCAD/EMTDC平台上搭建MMC模型,仿真结果表明所提策略可以在较少计算量下实现电容电压的均衡控制。
Since the capacitor voltage ranking of traditional voltage balancing control for MMC（Modular Multilevel Converter） impacts the response of control system,a strategy of fast voltage balancing control based on the bubbling principle is proposed. The on- and off-state extreme voltage sub-modules are obtained by bubbling computation in each control cycle. When the number of on-state sub-module changes,only the switching state of on-state extreme sub-module should be changed. When the voltage difference between onand off-state sub-modules exceeds the setting of allowable capacitor voltage deviation,exchange their switching states. MMC model is built on PSCAD / EMTDC and the simulative results show that,the proposed strategy realizes capacitor voltage balancing control with lower computation load.
出处
《电力自动化设备》
EI
CSCD
北大核心
2015年第9期81-86,共6页
Electric Power Automation Equipment
基金
国家自然科学基金资助项目(51277119)~~
关键词
模块化多电平换流器
冒泡原理
电压均衡
开关频率
最近电平控制
换流器
电压控制
modular multilevel converter
bubbling principle
voltage balancing
switching frequency
nearest level control
electric converters
voltage control
