Design and implementation of a 200w microinverter for grid connected photovoltaic energy conversion system

Kavurucu, Semih
As one type of the grid-connected photovoltaic energy conversion systems, micro-inverters (MI, also known as Module Integrated Inverters, MII) are typically designed for residential applications with energy capacities of 3-5 kW and less, in order to provide PV module level energy generation, plug-N-play operation, minimization of the shading effects occurring on the PV module, and flexibility of installation. For the micro-inverter system which can be designed employing variety of topologies, interleaving flyback converter with grid frequency operated DC/AC unfolding bridge is suggested, analyzed, and modeled. A 200 W single-phase flyback converter and 200 W two-phase interleaved flyback converter topologies are studied with respect to their efficiencies, harmonic isolations and load current regulations through detailed analysis, simulations, and laboratory experiments. In the hardware implementation, with the aid of a digital signal processor advanced control functions are implemented. Maximum power point tracking (MPPT), vector based phase locked loop (PLL) for grid synchronization and grid connection, and grid current control for low harmonic distortion, in addition to the basic connection and protection functions are implemented such that a highly efficient and effective PV conversion system performance is obtained. Design and implementation of 200 W micro-inverters with single-phase and two-phase interleaved flyback converters are realized and detailed laboratory tests are conducted. As a result, correlation among the theory, analysis, simulations, and laboratory experiments is provided and the feasibility of MI systems is proven. .


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Citation Formats
S. Kavurucu, “Design and implementation of a 200w microinverter for grid connected photovoltaic energy conversion system,” M.S. - Master of Science, Middle East Technical University, 2014.