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| Research and Design of Three-Phase Multilevel Current Source Rectifier |
| Bai Zhihong1, Zhang Zhongchao2 |
| 1. Huazhong University of Science and Technology Wuhan 430074 China 2. Zhejiang University Hangzhou 310027 China |
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Abstract Based on the mathematical model of three-phase multilevel current source rectifier (MCSR) developed in this paper, the design of control strategies and circuit parameters of MCSR are investigated. As for controlling, a double-loop control strategy for MCSR is developed, which considers circuit parameters of MCSR such as sharing-current inductors. When the sharing-current inductors are considered, the transfer characteristic of the dc voltage becomes second-order, which deteriorates the dc-side dynamic response. In this paper, a feed forward control of the load current is proposed to solve the conflict between the fast dynamic response and the gain peak of the second-order system at its resonance frequency, and even with the less loop gain, the system can achieve fast dynamic response and good steady state performance. This paper also presents a simple and general method to design the sharing-current inductors and the DC link capacitor in MCSR. Finally, an experiment on a three-module MCSR is carried out to verify the above proposition.
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Received: 11 December 2009
Published: 07 March 2014
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2011, Vol. 26 
