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Study on Single Phase PFC Based on Boost Topology under Digital Average Current Control

Author: WangZuo
Tutor: WangYi；LiuZhiYu
School: Harbin Institute of Technology
Course: Electrical Engineering
Keywords: average current control power factor correction digital control DSP
CLC: TM46
Type: Master's thesis
Year: 2008
Downloads: 209
Quote: 0
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Abstract


Improving the power factor is the solution to power electronic devices harmonic pollution, and also an effective way to improve grid reliability and power quality. With the development of digital control technology, more and more control strategy can be achieved by the digital signal processor. Use of digital signal processors to achieve PFC digital control is becoming a hot spot of current research. In this paper, a study on the average current control of the APFC and its application are carried out.The voltage and current loop controllers in average current mode are designed. Through the simulation and experiment, the impact of DSP delay on loop design is analysed. In addition, dynamic performance is improved when the source or load is hopping.A sampling method in digital average current controlled APFC is designed. And the simulation results show that the sampling method can improve the THD of the input current. Then the reason why the input current would overshoot at zero point is analysed, and the way to inhibite overshoots is also pointed out.The simulink models of the average current control with a feed-forward and the predict duty-ratio control are established. Based on the models, the THD is compared between average current control with a feed-forward and without a feed-forward. Then the advantages and disadvantages of predict control are analysed.The digital controlled APFC system based on Boost is designed. The experiment results show that THD of the input current is 3.8%

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