模块化多电平换流器子模块电容电压平衡改进控制方法An Improved Balance Control for Sub-Module Capacitor Voltage of Modular Multilevel Converter
辛业春;王朝斌;李国庆;吴学光;
摘要(Abstract):
为减少子模块开关动作次数和换流器损耗,提出了一种模块化多电平换流器(modular multilevel converter,MMC)的子模块电容电压平衡改进控制方法。采用最近电平调制方式,每个控制周期内按电容电压大小对处于投入状态和切出状态的2组子模块分别进行排序;根据需要投入的子模块数量和当前处于投入状态的子模块数量,对投入和切出的子模块状态进行改变;根据设定的电容电压允许偏差值、可进行调换的子模块数量,对投入和切出的子模块进行对调。仿真算例结果验证了所提方法的有效性。
关键词(KeyWords): 模块化多电平换流器;子模块;电压平衡;开关频率;开关损耗
基金项目(Foundation): 国家自然科学基金项目(51377016);; 国家电网公司“千人计划”专项支持项目(国家电网科[2013]1111号文)~~
作者(Author): 辛业春;王朝斌;李国庆;吴学光;
Email:
DOI: 10.13335/j.1000-3673.pst.2014.05.025
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