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电网技术  2015 

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

DOI: 10.13335/j.1000-3673.pst.2015.04.015, PP. 976-982

Keywords: 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

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Abstract:

针对模块化多电平变换器子模块不对称运行问题,提出了一种基于选择性定频积分逼近的PWM调制策略。变换器由于元件损坏或参数差异会出现子模块电容电压失衡的不对称运行状态,周期性地监测子模块电容电压和桥臂电流方向,改变PWM驱动信号与实际开关管驱动的映射关系,使系统由不平衡运行状态回到平衡运行状态。此外,该调制策略有效减少了开关管驱动的窄脉冲、降低了开关损耗。仿真和实验验证了所提方法的有效性。

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