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Grid-connected boost-half-bridge photovoltaic micro inverter system using repetitive current control and maximum power point tracking

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4 Author(s)
Shuai Jiang ; Dept. of ECE, Michigan State Univ., East Lansing, MI, USA ; Dong Cao ; Peng, F.Z. ; Yuan Li

This paper presents a novel boost-half-bridge micro inverter and its control implementations for single-phase grid-connected photovoltaic systems. The proposed topology consists of a transformer isolated boost-half-bridge DC-DC converter and a full-bridge pulse-width-modulated inverter. The boost-half-bridge converter integrates the conventional boost converter and the half-bridge converter by using only two active devices. The promising features such as circuit simplicity, low cost, high efficiency and high reliability are obtained. Moreover, a high performance plug-in repetitive controller is proposed to regulate the grid current. High power factor (>; 0.99) and very low total harmonic distortions (0.9% ~ 2.87%) are guaranteed under both heavy and light load conditions. Dynamic stiffness is also achieved under load step change conditions. In addition, a variable step size MPPT method is adopted such that fast tracking speed and high MPPT efficiency are both guaranteed. A 210W prototype was fabricated and tested. Simulation and experimental results are provided to verify the validity and performance of the circuit operations, current control and MPPT algorithm.

Published in:

Applied Power Electronics Conference and Exposition (APEC), 2012 Twenty-Seventh Annual IEEE

Date of Conference:

5-9 Feb. 2012