Abstract
The double-line frequency ripple power exists inherently in
single-phase power converters. To address this problem, active power
decoupling technique (APD) is widely used. It diverts the ripple power
into a small energy storage element through introducing passive and
active power devices. This inevitably involves more voltage and current
sensors for corresponding control, which raises the cost while
decreasing reliability and power density. In this paper, a
Lyapunov-based methodology is proposed to achieve APD control without
adding any sensor. According to the designed controller laws, the
practical decoupling capacitor voltage will converge to its reference.
The decoupling voltage reference is given by taking into account
buffering the double-line frequency ripple power. Afterwards, the
robustness against parameter perturbations of the proposed method is
discussed. Finally, the experimental results verify the
feasibility of the proposed control strategy.
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