Abstract:
Power decoupling requires large electrolytic capacitors on the dc bus of a single-phase inverter. Although the active power decoupling circuit can restrain the ripple voltage with twice the fundamental frequency on the dc bus and reduce the required capacitance, previous research mainly focused on power coupling of an ideal power grid and just decoupled the ripple power. This study analyzes power coupling in a nonideal power grid and designs a novel multiharmonic frequency dc bus power decoupling method. Modifying the reference values of dc series split-capacitors simplifies system control and enables multifrequency-coupled power decoupling. A notch filter in the dc voltage feedback path further reduces power coupling’s impact on inverter output current quality. Even in a weak power-grid environment, the proposed method achieves multifrequency-coupled power decoupling. Finally, numerical simulations and experimental results demonstrate the effectiveness of the proposed method compared to the capacitor decoupling framework and the dual-voltage control decoupling scheme.
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