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首页> 外文期刊>IEEE Transactions on Industrial Electronics >A Predictive Capacitor Voltage Control of a Hybrid Cascaded Multilevel Inverter With a Single DC-Link and Reduced Common-Mode Voltage Operation
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A Predictive Capacitor Voltage Control of a Hybrid Cascaded Multilevel Inverter With a Single DC-Link and Reduced Common-Mode Voltage Operation

机译：具有单个直流母线并降低共模电压工作的混合级联多电平逆变器的预测电容器电压控制

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摘要

For cascaded multilevel inverter topologies with a single dc supply, closed-loop capacitor voltage control is necessary for proper operation. This paper presents zero and reduced common-mode voltage (CMV) operation of a hybrid cascaded multilevel inverter with predictive capacitor voltage control. Each phase of the inverter is realized by cascading two- three-level flying capacitor inverters with a half-bridge module in between. For the presented inverter topology, there are redundant switching states for each inverter voltage levels. By using these switching state redundancies, for every sampling instant, a cost function is evaluated based on the predicted capacitor voltages for each phase. The switching state that minimizes cost function is treated as the best and is switched for that sampling instant. The inverter operates with zero CMV for a modulation index upto 86%. For modulation indices from 86% to 96%, the inverter can operate with reduced CMV magnitude ( ) and reduced CMV switching frequency using the new space-vector pulsewidth modulation (SVPWM) presented herein. As a result, the linear modulation range is increased to 96% as compared to 86% for zero CMV operation. Simulation and experimental results are presented for the inverter topology for various steady state and transient operating conditions by running an induction motor drive with open loop control scheme.
机译：对于具有单个直流电源的级联多电平逆变器拓扑，必须进行闭环电容器电压控制才能正常工作。本文介绍了具有预测电容器电压控制的混合级联多电平逆变器的零电压和降低共模电压（CMV）操作。逆变器的每一相都是通过级联两个三电平的飞跨电容器逆变器来实现的，中间有一个半桥模块。对于提出的逆变器拓扑，每个逆变器电压电平都有冗余的开关状态。通过使用这些开关状态冗余，对于每个采样时刻，都会基于每个相的预测电容器电压来评估成本函数。使成本函数最小化的切换状态被视为最佳状态，并在该采样瞬间进行切换。逆变器以零CMV运行，调制指数高达86％。对于从86％到96％的调制指数，逆变器可以使用本文介绍的新空间矢量脉宽调制（SVPWM）以降低的CMV幅度（）和降低的CMV开关频率工作。结果，与零CMV操作的86％相比，线性调制范围增加到96％。通过运行带有开环控制方案的感应电动机驱动器，给出了各种稳态和瞬态运行条件下逆变器拓扑的仿真和实验结果。

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