Power Decoupling Control of Single-Phase Differential Cuk Inverters

The single-phase differential Cuk inverter (DCI) is a single-stage inverter that offers numerous benefits over other single-stage topologies, making it a promising solution in new energy applications. However, the second-order ripple power inherent in its dc side seriously affects the performance of the system and restricts the application of the DCI. To address this issue, this study presents a novel automatic power decoupling (APD) control method for the DCI. It directly regulates the input current through a feedback linearization-based decoupling control strategy. An impedance-based stability analysis is performed on the DCI under the proposed APD control method. A hardware prototype is built to verify the effectiveness of the proposed control strategy. Experimental results demonstrate that the proposed APD strategy effectively suppresses 97.8% of the second-order ripple in the input current and improves the system efficiency by approximately 2.8%.