Title :
Design and Analysis of the synchronization control method for BCM/DCM current-mode flyback micro-inverter
Author :
Zhe Zhang ; Min Chen ; Wang Chen ; Zhaoming Qian
Author_Institution :
Coll. of Electr. Eng., Hangzhou, China
Abstract :
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.
Keywords :
DC-DC power convertors; closed loop systems; current-mode circuits; harmonic distortion; invertors; open loop systems; phase control; photovoltaic power systems; synchronisation; BCM; DC-DC stage; DCM; boundary conduction mode; closed-loop control; current-mode flyback microinverter; discontinuous conduction mode; interleaving phase synchronization control; master-slave relationship; open-loop interleaving technique; open-loop phase regulation; photovoltaic panel; power 200 W; power conversion efficiency; total harmonic distortion;
Conference_Titel :
Applied Power Electronics Conference and Exposition (APEC), 2013 Twenty-Eighth Annual IEEE
Conference_Location :
Long Beach, CA
Print_ISBN :
978-1-4673-4354-1
Electronic_ISBN :
1048-2334
DOI :
10.1109/APEC.2013.6520187