A Novel Control Method for the Active Power Decoupling Module with Plug-and-Play in Single Phase Inverter

Power difference between the DC side and the AC side of an inverter caused Low-frequency ripple current in the DC side. To reduce this current ripple, a traditional method is to use a large electrolytic capacitor to compensate this power difference. This reduces the reliability of the converter as the electrolytic capacitor is of low lifetime. Recently, power decoupling module is recommended to replace the large electrolytic capacitor. In this paper, a control method for boost type power decoupling module is proposed to reduce the current ripple of the DC side to zero. Hence, the DC voltage ripple also reduced to zero. The proposed control method only requires the ripple voltage of the DC side. Therefore, the cost of the power module is small and the module is plug-and-play. A prototype of boost-type power decoupling module with the proposed control implemented in 1 kW and 2 kW single-phase inverter with 380 V DC-link voltage is constructed. The results show that the proposed control method can fully compensate the second-order harmonic voltage of the DC side, and the input current ripple reduces to less than 8%.