电网技术Issue(4)：976-982,7.DOI:10.13335/j.1000-3673.pst.2015.04.015
基于选择性定频积分逼近调制策略的 MMC子模块不对称运行控制方法
Selective Constant Frequency Integration Approaching Modulation Based Control Method for Sub-Module Asymmetric Operation of Modular Multilevel Converter
摘要
Abstract
Due to element failure or differences among parameters, the asymmetric operation condition of the converter in modular multilevel converter (MMC) may be caused by the imbalance among capacitor voltages of sub-modules. To solve this problem, a selective constant frequency integration approaching modulation based pulse width modulated (PWM) strategy is proposed. In the proposed modulation strategy, the capacitor voltage of sub-modules and the current direction in the bridge-arms are periodically monitored to change the loop mapping relation between the driving signal of PWM and the driving of actual switching valves to make the MMC returning to balanced operation condition from unbalanced operation condition. Besides, the proposed modulation strategy can effectively reduce the number of the narrow pulse to drive the switching valves and switching loss can be correspondingly decreased. The validity of the proposed modulation strategy is verified by both results of simulation and experiments.关键词
模块化多电平变换器/子模块不对称运行/循环映射/选择性定频积分逼近/电压平衡控制Key words
MMC/sub-module asymmetric operation/loop mapping relationships/selective constant frequency integration approaching modulation/voltage balancing control分类
信息技术与安全科学引用本文复制引用
吉宇,梅军,方太勋,郑建勇,杜晓舟,马天,姜田贵..基于选择性定频积分逼近调制策略的 MMC子模块不对称运行控制方法[J].电网技术,2015,(4):976-982,7.基金项目
教育部博导类博士点基金(20130092110041)。Project Supported by Specialized Research Fund for the Doctoral Program of Higher Education(20130092110041) （20130092110041）
