A Medium-Voltage Motor Drive With a Modular Multilevel PWM Inverter

作者：Hagiwara Makoto^*; Nishimura Kazutoshi; Akagi Hirofumi

来源：IEEE Transactions on Power Electronics, 2010, 25(7): 1786-1799.

DOI：10.1109/TPEL.2010.2042303

• Cascaded stack
• medium voltage
• motor drives
• multilevel inverters
• pulsewidth modulation (PWM)

This paper describes the control and operating performance of a modular multilevel PWM inverter for a transformer-less medium-voltage motor drive. The inverter is prominent in the modular arm structure consisting of a cascaded stack of multiple bidirectional chopper-cells. The dominant ac-voltage fluctuation with the same frequency as the motor (inverter) frequency occurs across the dc capacitor of each chopper-cell. The magnitude of the voltage fluctuation is inversely proportional to the motor frequency. This paper achieves theoretical analysis on the voltage fluctuation, leading to system design. A downscaled model rated at 400 V and 15 kW is designed and built up to confirm the validity and effectiveness of the nine-level (17-level in line-to-line) PWM inverter for a medium-voltage motor drive.

• 出版日期2010-7