Low-Modulation-Index Operation of a Five-Level Diode-Clamped PWM Inverter With a DC-Voltage-Balancing Circuit for a Motor Drive
Low-Modulation-Index Operation of a Five-Level Diode-Clamped PWM Inverter With a DC-Voltage-Balancing Circuit for a Motor Drive
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DOI：
10.1109/tpel.2012.2185068
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发表时间：
2012-01
影响因子：
6.7
通讯作者：
K. Hasegawa;H. Akagi
中科院分区：
文献类型：
--
作者：
K. Hasegawa;H. Akagi
本文提出了一种五电平二极管箝位脉宽调制（PWM）逆变器，用于中压电机驱动与恒转矩负载，但没有再生制动。适用于钻机、挤出机、橡胶混炼机等。功率变换系统由一个三相六脉冲二极管整流器，一个五电平二极管箝位PWM逆变器，和一个直流电压平衡电路，包括一个单一的耦合电感。五电平逆变器的特征在于在低调制指数区域中的三相参考电压中的每一个上注入公共九次谐波零序电压。这种注入不仅有助于减轻耦合电感器的磁通量波动，而且还使每个引脚由八个绝缘栅双极晶体管模块产生的功率损耗均匀。此外，直流电压平衡电路引入了能够减小耦合电感器的磁通量的幅度的控制方法。将该控制方法与九次谐波零序电压注入相结合，可使磁通峰值保持在设计值以内。
This paper presents a five-level diode-clamped pulse width-modulated (PWM) inverter intended for a medium-voltage motor drive with a constant-torque load but no regenerative braking. It is applicable to drilling rigs, extruders, and rubber mixers. The power conversion system consists of a three-phase six-pulse diode rectifier, a five-level diode-clamped PWM inverter, and a dc- voltage-balancing circuit including a single coupled inductor. The five-level inverter is characterized by injecting a common ninth-harmonic zero-sequence voltage on each of the three-phase reference voltages in a low-modulation-index region. This injection contributes not only to mitigating magnetic-flux fluctuation of the coupled inductor but also to making uniform the power losses produced by eight insulated-gate bipolar transistor modules per leg. In addition, the dc-voltage-balancing circuit introduces a control method capable of reducing an amplitude of magnetic flux of the coupled inductor. The combination of this control method and the ninth-harmonic zero-sequence voltage injection keeps the peak value of the magnetic flux within its designed value.