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This paper proposes a new type of interphase voltage sag/swell compensator based on voltage-fed quasi-Z-source ac-ac converter to implement a four quadrant voltage injection. By PWM duty-ratio control, the converter performs as a “solid-state transformers” to provide a larger range of output ac voltage with buck-boost, reversing or maintaining phase angle, reducing in-rush and harmonic current, reducing...
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...
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