Experimental Verification of an Electrical Drive Fed by a Modular Multilevel TSBC Converter When the Motor Frequency Gets Closer or Equal to the Supply Frequency
Experimental Verification of an Electrical Drive Fed by a Modular Multilevel TSBC Converter When the Motor Frequency Gets Closer or Equal to the Supply Frequency
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DOI：
10.1109/tia.2017.2665635
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发表时间：
2017-02
影响因子：
4.4
通讯作者：
W. Kawamura;Yuto Chiba;M. Hagiwara;H. Akagi
中科院分区：
文献类型：
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作者：
W. Kawamura;Yuto Chiba;M. Hagiwara;H. Akagi
本文对模块化多电平三星桥单元(TSBC)变流器供电的无级变速电气传动进行了实验研究。TSBC变流器适用于带再生制动的中压大功率电机驱动。然而，它受到电容电压波动的影响，随着电机频率接近或等于电源频率，电容电压波动变得更加严重。本文提出了一种实用的解决方案，所有九个簇电流都有可接受的增加。该解决方案的特点是一个电机励磁电流控制器，它在理论上对消除每个电容器电压中包含的低频分量做出了重大贡献。从额定电压为400V、功率为15kW的三相小型化模型上获得的实验波形验证了从静止到额定电机频率等于电源频率的良好启动性能。
This paper provides an experimental discussion on an adjustable-speed electrical drive fed by a modular multilevel triple-star bridge-cell (TSBC) converter. The TSBC converter is suitable for medium-voltage high-power motor drives with regenerative braking. However, it suffers from capacitor-voltage fluctuation that becomes more serious as the motor frequency gets closer or equal to the supply frequency. This paper presents a practical solution of it with an acceptable increase in all the nine cluster currents. The solution is characterized by a motor-magnetizing-current controller that makes a significant contribution to theoretically eliminating the low-frequency component contained in each capacitor voltage. Experimental waveforms, which are obtained from a three-phase downscaled model rated at 400 V and 15 kW, verify exhibit satisfactory start-up performance from a standstill to the rated motor frequency that is equal to the supply frequency.