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Development of A Grid Connected Inverter for Solar PV Systems with Energy Capture Improvement Based On Current Control Strategy

In this paper a single stage inverter for solar PV system with energy capture improvement based on voltage control to solve fast changing irradiation problem is proposed. A cascaded control structure with a dc link voltage control loop and a current control loop is used. The maximum power capturing controller is applied to the reference of the outer loop control dc voltage photovoltaic,. without PV array power measurement. In order to generate the correct maximum power point reference voltage under rapidly changing irradiation, a robust maximum power point capturing controller has been proposed. In this controller, the d-axis grid current component reflecting the power grid side and the signal error of a proportional–integral outer voltage regulator is designed to reflect the change in power caused by the irradiation variation. Hence, with this information, the proposed algorithm can greatly reduce the power losses caused by the dynamic tracking errors under rapid weather changing conditions. The superiority of the newly proposed method is supported by simulation and experimental results. The robust tracking capability under rapidly increasing and decreasing irradiance is verified experimentally with a PV array emulator. The performance of the power flow depends largely on the quality of the applied current control strategy.