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This paper describes the design and performance of a parallel hybrid active power filter integrated into a three-phase diode rectifier with a capacitive load. The hybrid filter is composed by a three-phase LC filter and a small rated active filter based on a three-phase voltage-source PWM converter. The passive filter is designed with focus on characteristic impedance, resonant frequency, influence...
Hybrid Active Power Filters (HAPFs) can effectively suppress harmonic current in power-lines, the compensation precision of which rely heavily on the design of the current loop and dc voltage controllers. In this paper, the operation principle of a transformerless HAPF is introduced and analyzed, and then a double closed loop control strategy with power-line current feedback and the fifth harmonic...
Hybrid filters could restrain harmonic current in distribution power-line effectively and their compensation precision relies heavily on the design of current loop controllers. Since the reference and feedback signals of the current loop controller are composed by different harmonic components and the bandwidth of conventional proportional controller is limited, this controller cannot control the...
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