Single Stage Grid-Connected Micro-Inverter for Photovoltaic Systems
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Authors
Sukesh, Nikhil
Date
2012-07-09
Type
thesis
Language
eng
Keyword
Flyback , Single Stage , ZVS , Renewable energy , Soft-switching , PV Micro-inverter
Alternative Title
Abstract
This thesis presents a novel Zero Voltage Switching (ZVS) approach in a grid connected single-stage flyback inverter without using any additional auxiliary circuits. The soft-switching of the primary switch is achieved by allowing negative current from the grid-side through bidirectional switches placed on the secondary side of the transformer. Basically, the negative current discharges the MOSFET’s output capacitor thereby allowing turn-on of the primary switch under zero voltage. In order to optimize the amount of reactive current required to achieve ZVS a variable frequency control scheme is implemented over the line cycle. In addition, the bi-directional switches on the secondary side of the transformer have ZVS during the turn-on times. Therefore, the switching losses of the bi-directional switches are negligible. A 250W prototype has been implemented in order to validate the proposed scheme. Experimental results confirm the feasibility and superior performance of the converter compared to the conventional flyback inverter.
Description
Thesis (Master, Electrical & Computer Engineering) -- Queen's University, 2012-07-06 16:24:13.385
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This publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.