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A Practical Series Hybrid Active Power Filter Based on Fundamental Magnetic Flux Compensation

Li Dayi Chen Qiaofu Jia Zhengchun (Huazhong University of Science and Technology 430074 China)  
A practical series hybrid active power filter based on the fundamental magnetic flux compensation of the series transformer is analyzed.In the active power filter,a series transformer is chosen with its primary winding is connected in series between the power utility and harmonic producing loads.The compensating fundamental current proportional to the fundamental component of the utility current is injected to the secondary winding of the series transformer.When the injected fundamental current and the fundamental current of the power utility satisfy the fundamental magnetic flux compensation condition,the series transformer can really exhibit very low impedance at the fundamental frequency and high magnetizing impedance at harmonics frequencies.And the current control strategy is simulated.The validity of the heory and excellent compensation characteristics are verified by a large rated prototype.
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