Constant common-mode voltage transformerless inverter for grid-tied photovoltaic application

Publication Type:
Conference Proceeding
2019 IEEE Energy Conversion Congress and Exposition, ECCE 2019, 2019, pp. 616 - 621
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© 2019 IEEE. This paper proposes a new H-bridge clamped transformerless inverter for the grid-connected Photovoltaic (PV) application. The clamping circuit consists of two switches and a full bridge diodes, which can clamp the AC terminal voltage to the DC midpoint during the freewheeling period. As a result, the common mode voltage (CMV) is held constant, which makes it a suitable candidate for the grid-connected PV system. Furthermore, the efficiency of the proposed topology is relatively higher than other topologies. The operating principle of the proposed topology is analyzed in brief. Thermal modeling for the proposed topology has presented for loss calculation. Finally, the theoretical analysis is validated with simulation and experimental results. Validation is carried out using PLECS simulation and experimental results.
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