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Development of the Series-in Series Hybrid Active Power Filter

TONG Li-qing1,2,SUN Yao-jie1,2,LIN Yan-dan1,2,QIAN Zhao-ming3(1.Department of Light Sources and Illuminating Engineering,Fudan University,Shanghai 200433,China;2.Engineering Research Center of Advanced Lighting Technology,Ministry of Education,Fudan University,Shanghai 200433,China;3.College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China)  
In order to improve the effect of the passive filters and to obtain a high power rating and better performance active power filters,a series-in series hybrid active power filter is proposed.The series-in series hybrid active power filter is a combined system of a traditional series hybrid active power filter and a LC fundamental frequency series resonance circuit which is connected in series between the output filter and the source on the secondary of the couple transformer.The LC fundamental frequency series resonance circuit presents the zero impedance at the fundamental frequency and the linear increment impedance characteristic at the harmonic frequency,especially very high impedance at high frequency,so it can increase the loop harmonic impedance gain for the harmonic load current and the source harmonic suppression.Due to enduring the most harmonic voltage of the series part,the LC fundamental frequency series resonance circuit can decrease the harmonic voltage of the inverter,increase harmonic impedance gain of the main circuit,and avoid the parameters variation of the line and passive filter.Simulation and experimental results verify that the proposed hybrid active power filter can improve the effect of the shunt passive filters,decrease the rating of the inverter,and improve the system filtering performance.
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