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A Carrier-Based Modulation Method with Clamped Area for Input Current Performance of Vienna Rectifier |
Zhu Wenjie, Chen Changsong, Duan Shanxu |
State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Huazhong University of Science and Technology Wuhan 430074 China |
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Abstract The three-phase three-level Vienna rectifier is a very suitable power factor converter (PFC) because of its low total harmonic distortion (THD) of input current, high power density and unity power factor. However, during the transient turn-on/off progress, the nonlinear factors, such as snubber circuit and parasitic capacitance, will cause terminal voltage error and distort input current. Therefore, this paper proposed a carrier-based pulse-width modulation (CB-PWM) with clamped area. Considering the nonlinearity of Vienna rectifier, the switching transient progress and the terminal voltage error are analyzed. The CB-PWM method clamps the zero-crossing phase to the neutral-point within clamped angle, which reduces terminal voltage error and improves the input current quality. The conventional SPWM method and the proposed clamped CB-PWM method are compared by simulation and experiment. The results show that the lower-order current harmonics and current THD can be reduced, which verifies the proposed clamped CB-PWM method.
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Received: 11 March 2018
Published: 05 May 2019
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