Modelling analysis and power loss of coupled-inductor single-stage boost inverter based grid-connected photovoltaic power system

The coupled-inductor single-stage boost inverter (CI-SSBI) has been proposed and applied to photovoltaic (PV) power system. As previously presented, the CI-SSBI has the feature of stepping up input voltage to a higher voltage level by properly designing the turns ratio of coupled inductor and regulating the shoot-through duty cycle. The CI-SSBI based grid-connected PV system integrates some characteristics together in one stage, including boost inversion, feeding current into the grid with high power factor, and maximum power point tracking. Moreover, system reliability can be improved by using the shoot-through zero states as a normal operation mode. This study focuses on the power loss analysis of main elements, and control analysis of both bus voltage loop and inner current loop of the proposed PV system. Simulation and experimental results are presented to verify the analysis and show the real system performance.

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