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Startup and low-speed operation of an adjustable-speed motor driven by a modular multilevel cascade inverter (MMCI).
- Source :
- 2012 IEEE Energy Conversion Congress & Exposition (ECCE); 1/ 1/2012, p718-725, 8p
- Publication Year :
- 2012
-
Abstract
- 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 is formed by 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 the fluctuation is equal to the stator-current frequency. This paper attempts to suppress the fluctuation by injecting a common-mode voltage of 45 Hz 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 17 min−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. [ABSTRACT FROM PUBLISHER]
Details
- Language :
- English
- ISBNs :
- 9781467308021
- Database :
- Complementary Index
- Journal :
- 2012 IEEE Energy Conversion Congress & Exposition (ECCE)
- Publication Type :
- Conference
- Accession number :
- 86549660
- Full Text :
- https://doi.org/10.1109/ECCE.2012.6342749