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Design and Analysis of the synchronization control method for BCM/DCM current-mode flyback micro-inverter

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4 Author(s)
Zhe Zhang ; Coll. of Electr. Eng., Hangzhou, China ; Min Chen ; Wang Chen ; Zhaoming Qian

A micro-inverter could be directly integrated with a PV panel to generate grid-compatible AC power. Placing two flyback converters in parallel as the DC-DC stage and utilizing interleaving extends the power range of flyback micro-inverters. In this paper, open-loop interleaving technique for flyback micro-inverter operating at the boundary conduction mode (BCM) and discontinuous conduction mode (DCM) with a master-slave relationship are analyzed first. Then, a novel interleaving phase synchronization control method is proposed to achieve high power conversion efficiency and stable operation at the same time. In DCM operation region the open-loop phase regulation will be utilized while in BCM a closed-loop technique will dominate. A 200 W interleaved flyback micro-inverter prototype is built to verify the proposed interleaving synchronization control method. Simulation and Experimental results are provided to show that the proposed closed-loop control method could achieve stable interleaving phase synchronization while maintain good efficiency and low THD performance.

Published in:

Applied Power Electronics Conference and Exposition (APEC), 2013 Twenty-Eighth Annual IEEE

Date of Conference:

17-21 March 2013

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