Open AccessA new adaptive clamp for improving weighted efficiency in grid‐tied photovoltaic interleaved two‐switch flyback micro‐inverter
Author(s) -
Mohammadi Saleh,
Izadfar Hamid Reza,
Eskandarian Naser
Publication year - 2019
Publication title -
international transactions on electrical energy systems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 42
ISSN - 2050-7038
DOI - 10.1002/2050-7038.12033
Subject(s) - flyback transformer , flyback diode , inverter , photovoltaic system , solar micro inverter , flyback converter , voltage , power (physics) , clamper , control theory (sociology) , electronic engineering , computer science , electrical engineering , engineering , maximum power point tracking , physics , boost converter , transformer , control (management) , quantum mechanics , artificial intelligence
Summary This paper proposes a new adaptive clamp based on the hybrid operation of the interleaved two‐switch flyback micro‐inverter in one‐phase and two‐phase discontinuous conduction modes (DCM) depending on the output power of the PV panel. The proposed adaptive clamp controls the second switch of the two‐switch flyback structure based on the drain‐to‐source voltage spike of the flyback's main switch during the turn‐off process. Thus, in low‐voltage regions, a conventional flyback (single‐switch) operation is achieved with reduced switching, gate driving, and clamp diodes losses. Also, in the low output powers of the micro‐inverter, only one phase of the micro‐inverter operates to decrease the power loss associated with one phase. The theoretical analysis, simulation, and experimental results show the effectiveness of the proposed adaptive clamp and the phase control methods in improving the efficiency in all power ranges.