Modeling and testing of two-stage grid-connected photovoltaic micro-inverters |
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| Affiliation: | 1. Proyecto curricular de Ingeniería Eléctrica, Facultad de Ingeniería, Universidad Distrital Francisco José de Caldas Carrera 7 Nº 40B-53 Piso 5, Bogotá D.C., Colombia;2. Proyecto curricular de Ingeniería Electrónica, Facultad de Ingeniería, Universidad Distrital Francisco José de Caldas Carrera 7 Nº 40B-53 Piso 5, Bogotá D.C., Colombia;1. Department of Electrical Engineering, M.I.T.S., Gwalior, India;2. Department of Electrical Engineering, IIT Delhi, India;1. Institut national de la recherche scientifique, Centre Eau Terre Environnement, 490 rue de la Couronne, Québec, QC, G1K 9A9, Canada;2. Département de génie mécanique, École de Technologie Supérieure, 1100 rue Notre-Dame Ouest, Montréal, QC, H3C 1K3, Canada;1. Department of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, PR China;2. Zhejiang Tianneng Energy Technology Co., Ltd., Changxing County, Zhejiang Province 313100, PR China;1. Department of Electrical Engineering, College of Engineering, King Saud University, Riyadh, 11421, Saudi Arabia;2. Electrical & Computer Engineering, University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada;1. Faculty of Engineering, Department of Electrical Engineering, Bu-Ali Sina University, Hamedan, Iran;2. Faculty of Engineering, Department of Electrical Engineering, Ayatollah Borujerdi University, Broujerd, Iran;1. School of Engineering, University of Portsmouth, UK;2. Fluid Structure Interaction Research Group, Faculty of Engineering and the Environment, University of Southampton, UK |
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| Abstract: | In this paper, the characteristics, design and control parameters of a 200 W micro-inverter, consisting of two conversion stages are presented; the first one is implemented by a push-pull converter, which provides galvanic insulation and adjusts the DC voltage from the photovoltaic panel to an appropriate voltage with the implementation of a current injected control. The second stage corresponds to a full bridge inverter SPWM with an average current control, which injects energy from the push-pull converter to the grid; it is synchronized with the grid and delivers the maximum power provided by the photovoltaic panel. Power is extracted through the Maximum Power Point Tracking Technique (MPPT). The micro-inverter is simulated and its behavior to irradiance variations is observed. Finally, the transient and stable responses of the implemented micro-inverter are presented. Stable and slightly underdamped output signals (voltage and current) are obtained under current panel variations. |
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| Keywords: | Control DC-DC converter Inverter Modeling Photovoltaic systems |
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