Enhanced Voltage Balancing of a Flying Capacitor Multilevel Converter Using Phase Disposition (PD) Modulation
Enhanced Voltage Balancing of a Flying Capacitor Multilevel Converter Using Phase Disposition (PD) Modulation
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DOI：
10.1109/ecce.2009.5316343
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发表时间：
2009-11
影响因子：
6.7
通讯作者：
B. McGrath;D. G. Holmes
中科院分区：
文献类型：
--
作者：
B. McGrath;D. G. Holmes
分析了三相飞跨电容多电平变流器在频谱最优相位配置（PD）脉宽调制（PWM）策略下的自然电压平衡特性。使用这种分析，它表明，PD PWM具有上级平衡特性相比，相移载波PWM策略，因为它把更多的频谱能量到差模边带谐波驱动的电压平衡过程。从这个理解，提出了一种替代平衡升压滤波器网络连接，显着提高了自然平衡响应的飞跨电容器转换器的PWM策略。分析证实了广泛的模拟和实验研究。
This paper analyses the natural voltage-balancing characteristic of a three-phase flying capacitor multilevel converter when it is operated under the spectrally optimal Phase Disposition (PD) pulsewidth modulation (PWM) strategy. Using this analysis, it is shown that PD PWM has superior balancing characteristics compared to the phase-shifted carrier PWM strategy, because it places more spectral energy into the differential-mode sideband harmonics that drive the voltage-balancing process. From this understanding, an alternative balance booster filter network connection is proposed that significantly improves the natural balancing response of a flying capacitor converter for either PWM strategy. The analysis is confirmed by extensive simulation and experimental studies.