Startup and low-speed operation of an adjustable-speed motor driven by a modular multilevel cascade inverter (MMCI)
Startup and low-speed operation of an adjustable-speed motor driven by a modular multilevel cascade inverter (MMCI)
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DOI：
10.1109/ecce.2012.6342749
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发表时间：
2012-11
期刊：
影响因子：
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通讯作者：
M. Hagiwara;I. Hasegawa;H. Akagi
中科院分区：
文献类型：
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作者：
M. Hagiwara;I. Hasegawa;H. Akagi
基于双星斩波单元的模块化多电平级联逆变器（MMCI DSCC）有望成为下一代适用于电机驱动的节能型中压PWM逆变器之一。该三相逆变器由六个模块化臂组成，每个模块化臂由多个双向斩波单元的级联堆叠组成。它遭受交流电压波动的直流电容器电压的每个斩波单元在低速。波动的频率等于定子电流的频率。本文试图通过注入45 Hz的共模电压和三个支路之间的循环电流来抑制波动。在400 V 15 kW小型化系统上进行的实验结果表明，该系统在17 min-1的超低速、τL= 40%的负载转矩和三相直流供电下运行稳定。此外，电机可以从静止状态启动，而不会产生任何过压或过流。
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.