Wide-Input-Range High-Frequency-Link Split-Phase Microinverter with Active-Power-Decoupling Ability

A novel wide-input-range high-frequency-link (HFL) split-phase microinverter with active-power-decoupling (APD) ability is proposed in this paper. It integrates a boost converter into the single-stage HFL microinverter by multiplexing switches, to achieve a high and adjustable output gain without additional switching devices. Meanwhile, with the proposed modulation and control strategy, the APD can be achieved. Therefore, the photovoltaic (PV)-side capacitance can be significantly reduced. It has split-phase output structure, which is suitable for both single-phase three-wire system and single-phase two-wire system. Owing to its voltage-source-inverter (VSI) feature, the proposed microinverter can be used in both grid-connected and islanded applications. Experimental results from a 600-W, 22V-55V input voltage, 240Vac output voltage prototype verify the topology.