Abstract
A new multilevel inverter based on flyback converter is presented in this paper. By employing the DC-DC flyback converter the voltage of DC-link capacitors is adjusted. In the proposed structure, the required input DC voltages are provided with a single-input multi-output flyback DC-DC converter. The proposed topology can decrease total harmonics distortion (THD) of the injected grid current. Also, the proposed topology is suitable for photovoltaic (PV) applications. In addition, the proposed inverter can be connected to grid for injecting a sinusoidal current under desired power factors (leading, lagging and unity). In this case, the suggested inverter is able to control the active and reactive powers. This leads to generate a tightly controlled current with a high quality that can be injected to the grid utilizing a single renewable energy resource. It should be noted that the experimental results of the proposed inverter will be obtained when the topology is connected to the local grid. In addition, in the proposed topology by using flyback converter the local grid is isolated from PV panel, so the generated leakage current can be eliminated completely. The operation modes, design consideration, comparison results and finally 620 watt built prototype results are presented.
Published Version
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