PV Micro-Inverter Topology Using LLC Resonant Converter
AbstractIn this paper, a DC–single-phase AC power converter with an LLC resonant converter is presented for a photovoltaic (PV) micro-inverter application. This application requires the leakage current suppression capability. Therefore, an isolated power converter is usually combined for DC/AC systems. The LLC resonant converter is the one of the isolated power converter topologies, and it has good performance for conversion efficiency with easy control. On the other hand, a double-line frequency power ripple has to be compensated for in order to improve the performance of the maximum power point tracking (MPPT). Therefore, a bulky electrolytic capacitor is usually necessary for the power converter. However, the electrolytic capacitor may limit the lifetime of the micro-inverter. This paper introduces the PV micro-inverter with a LLC resonant converter. In addition, the active power decoupling circuit is applied in order to compensate the double-line frequency power ripple by the small capacitor in order to eliminate the electrolytic capacitor. Finally, the transformer design is considered in order to reduce the transformer losses. As a result, the conversion efficiency of the LLC converter is improved by 1% when the litz wire has many strands. View Full-Text
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Watanabe, H.; Itoh, J.-I.; Koike, N.; Nagai, S. PV Micro-Inverter Topology Using LLC Resonant Converter. Energies 2019, 12, 3106.
Watanabe H, Itoh J-I, Koike N, Nagai S. PV Micro-Inverter Topology Using LLC Resonant Converter. Energies. 2019; 12(16):3106.Chicago/Turabian Style
Watanabe, Hiroki; Itoh, Jun-ichi; Koike, Naoki; Nagai, Shinichiro. 2019. "PV Micro-Inverter Topology Using LLC Resonant Converter." Energies 12, no. 16: 3106.
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