IEEJ Transactions on Industry Applications
Online ISSN : 1348-8163
Print ISSN : 0913-6339
ISSN-L : 0913-6339
Low-Speed Operation of a Medium-Voltage Motor Drive Using a Modular Multilevel Cascade Inverter (MMCI-DSCC)
Makoto HagiwaraIsamu HasegawaHirofumi Akagi
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2012 Volume 132 Issue 11 Pages 1072-1079


A modular multilevel cascade inverter based on double-star chopper-cells (MMCI-DSCC) is expected to be used as one of the next-generation medium-voltage PWM inverters suitable to motor drives for energy savings. This three-phase inverter comprises six modular arms, each of which consists of a cascaded stack of multiple bidirectional chopper-cells. It suffers from ac-voltage fluctuation in the dc-capacitor voltage of each chopper-cell at low speed. The frequency of this fluctuation is equal to the stator-current frequency. This paper attempts to suppress the fluctuation by injecting a common-mode voltage of 45Hz and circulating currents among the three legs. Experimental results obtained from a 400-V, 15-kW downscaled system verify that stable operation is achieved at an ultra-low speed of 17min-1 with a load torque of τL = 40%, as well as “three-phase” dc-current feeding operation. Moreover, the motor can start up from a standstill without producing any overvoltage or overcurrent.

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© 2012 by the Institute of Electrical Engineers of Japan
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