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17. Highly Efficient Microinverter With Soft-Switching Step-Up Converter and Single-Switch-Modulation Inverter.

Author

Cha, Woo-Jun, Cho, Yong-Won, Kwon, Jung-Min, and Kwon, Bong-Hwan

Subjects
*ELECTRIC inverters, *PHOTOVOLTAIC power systems, *ELECTRIC switchgear, *CONVERTERS (Electronics), *ELECTRIC current rectifiers
Abstract

This paper presents a novel microinverter for a single-phase grid-connected photovoltaic (PV) system. The proposed microinverter consists of a step-up dc–dc converter using an active-clamp circuit with a series-resonant voltage doubler and a high-efficiency inverter with single-switch-modulation step-down converters. The active-clamp circuit provides zero-voltage switching (ZVS) turn-on, recycles the energy stored in the leakage inductance of the transformer, and limits switch voltage stress. Moreover, to remove the reverse-recovery problem of the rectifier diodes, a series-resonant voltage doubler is used. Thus, this whole process provides high efficiency. To improve efficiency and reliability in the proposed inverter, only a single switch is modulated at the switching frequency without a shoot-through problem. A modified controller is also adopted to achieve fast output control. Thus, the proposed PV microinverter has the structure to minimize power losses. The experimental results show a maximum efficiency of 96.2% for a 400-W microinverter. [ABSTRACT FROM PUBLISHER]

Published
2015
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