A New DC-Voltage-Balancing Circuit Including a Single Coupled Inductor for a Five-Level Diode-Clamped PWM Inverter

被引：101
作者：
Hasegawa, Kazunori [1 ]
Akagi, Hirofumi [1 ]
机构：
[1] Tokyo Inst Technol, Tokyo 1528550, Japan
来源：
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS | 2011年 / 47卷 / 02期
关键词：
Coupled inductors; motor drives; multilevel inverters; voltage balancing; CONVERTER; DESIGN; SYSTEM;
D O I：
10.1109/TIA.2010.2102327
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
This paper proposes a new dc-voltage-balancing circuit for a five-level diode-clamped inverter intended for a medium-voltage motor drive with a three-phase diode rectifier used as the front end. This circuit consists of two unidirectional choppers and a single coupled inductor with two galvanically isolated windings. The inductor produces no net dc magnetic flux because the individual dc magnetic fluxes generated by the two windings are canceled out with each other. This makes the inductor compact by a factor of six, compared with the balancing circuit including two noncoupled inductors. Moreover, introducing phase-shift control to the new balancing circuit makes it possible to adjust the midpoint voltage. As a result, the dc mean voltages of all the four split dc capacitors can be balanced, independent of inverter control. Experimental results obtained from a 200-V 5.5-kW downscaled model verify the effectiveness of the new balancing circuit.
引用
收藏
页码：841 / 852
页数：12
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