Research on the filtering characteristic of single phase series hybrid active power filter based on fundamental magnetic flux compensation |
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| Authors: | Jun Tian Qiaofu Chen Yuqi Zhang |
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| Affiliation: | 1. DEC R&2. D CENTER, Intelligent Equipments &3. Control Technology Institute, Dongfang Electric Corporation , Chengdu 611731 , China tianjun@smail.hust.edu.cn;5. College of Electrical and Electronic Engineering, Huazhong University of Science and Technology , Wuhan 430074 , China;6. Department of Electronic Engineering , University of Electronic Science and Technology of China , Chengdu 611731 , China |
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| Abstract: | In this article, the PWM inverter works as a controlled fundamental current source in the single phase series hybrid active power filter (APF) based on fundamental magnetic flux compensation (FMFC). The series transformer can exhibit the self-impedance of primary winding to harmonic current, which forces harmonic current to flow into passive power filter. With the influence of harmonic current, the voltage of primary winding of transformer is a harmonic voltage, which makes the inverter output currents have a certain harmonic component, and it degrades the filtering characteristics. On the basis of PWM inverter, the mathematical model of series hybrid APF is established, and the filtering characteristics of single phase APF are analysed in detail. Three methods are gained to improve filtering characteristics: reasonably designing the inverter output filter inductance, increasing series transformer ratio and adopting voltage feed-forward control. Experimental results show that the proposed APF has greater validity. |
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| Keywords: | active power filter fundamental magnetic flux compensation transformer mathematical model filtering characteristic |
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