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A Natural Soft-Commutation PWM Scheme for Current Source Converter and Its Logic Implementation

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3 Author(s)
Zhihong Bai ; College of Electrical and Electronic Engineering, Huazhong University of Science and Technology , Wuhan, China ; Zhongchao Zhang ; Xinbo Ruan

This paper presents a current soft-commutation pulsewidth modulation (PWM) scheme for three-phase current source converter. With the presented PWM scheme, the incoming switch has a positive collector-to-emitter voltage while the outgoing switch has a negative collector-to-emitter voltage during current commutations. Therefore, natural soft commutations for switching transitions are achieved, while current-commutating durations are also lessened. Moreover, some particular advantages can also be obtained such as reduced switching frequency, high dc current utilization ratio, and in-phase transfer between line currents and their references. For more efficient control, this paper then designs logic equations for mapping out the assignments from references to gating signals, allowing a simple implementation using a digital signal processor or a programmable logic device. The theoretical analysis is verified by experimental results.

Published in:

IEEE Transactions on Industrial Electronics  (Volume:58 ,  Issue: 7 )