A Modified MPPT-SRF Configuration of a Single Stag Grid-Connected PV System Inverter Based on Voltage-Oriented Control
|Dindu Venkata Koteswara Rao1 and O. Ranjit Kumar2
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A Modified MPPT-SRF Configuration of a Single Stag Grid-Connected PV System Inverter Based On Voltage-Oriented Control is shows better performance in conversion of PV output power into high-quality ac voltage. Hear the purpose of voltage-oriented control (VOC) is to solve fast varying irradiation problems. In VOC, a cascaded control structure with an outer dc link voltage control loop and an inner current control loop is used. The currents are controlled in a synchronous orthogonal d-q frame using a decoupled feedback control. The reference current of proportional–integral (PI) d-axis controller is replaced with FUZZY controller to improve the fastness of the triggering circuit of the VSI. With this we can achieve a unity power factor, the q-axis reference is set to zero and wave distortion are reduced which gives an improved efficiency. Simulations and experimental results demonstrate that the proposed method provides effective, fast, and perfect tracking. The results are examined by using MATLAB software.