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首页> 外文期刊>IEEE Transactions on Industrial Electronics >A Modified Level-Shifted PWM Strategy for Fault-Tolerant Cascaded Multilevel Inverters With Improved Power Distribution
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A Modified Level-Shifted PWM Strategy for Fault-Tolerant Cascaded Multilevel Inverters With Improved Power Distribution

机译：具有改进功率分配的容错级联多电平逆变器的改进的电平移位PWM策略

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摘要

To increase the fault tolerance for cascaded H-bridge multilevel inverters (CHMIs) based on level-shifted pulse width modulation (LS-PWM), a modified LS-PWM method is proposed for the inverters operating under faulty conditions. To cover both open- and short-device fault cases, two types of switching scheme are included in this PWM method. With this PWM method, the neutral shift can be applied as fault-tolerant control for CHMIs based on LS-PWM. Finally, three-phase-balanced line-to-line voltages and currents with minimum harmonic distortion are produced for the inverter with disabled power cells. In addition, this LS-PWM method has the capability to improve power distribution among the H-bridge power cells under the faulty conditions. Simulation and experimental results show that the proposed PWM method performs satisfactorily to achieve fault tolerance.
机译：为了提高基于电平移位脉冲宽度调制（LS-PWM）的级联H桥多电平逆变器（CHMI）的容错能力，针对故障条件下运行的逆变器，提出了一种改进的LS-PWM方法。为了涵盖开路和短路设备故障情况，此PWM方法包括两种类型的开关方案。使用这种PWM方法，空档可以用作基于LS-PWM的CHMI的容错控制。最终，为具有禁用功率单元的逆变器提供了具有最小谐波失真的三相平衡线间电压和电流。另外，该LS-PWM方法具有在故障条件下改善H桥功率单元之间的功率分配的能力。仿真和实验结果表明，所提出的PWM方法能够令人满意地实现容错。

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