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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...
The voltage-fed quasi-Z-source inverter (qZSI) has been presented advantageous for photovoltaic (PV) applications. This paper further develops the closed-loop controller for the qZSI operating in both stand-alone and grid-connected modes. Regarding to the limitation between the modulation index and shoot-through duty ratio, guideline of the reference selection for capacitor voltage to minimize the...
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