Performance analysis of boost half bridge photovoltaic microinverter using RCC variable step size algorithm

This work presents the photovoltaic Micro Inverter Systems (MIS) and its control techniques. The Micro Inverter is the combination of a boost-half-bridge DC-DC converter and full bridge pulse width-modulated inverter. The Repetitive Current Controller (RCC) based on fourth-order linear phase IIR filter is used to regulate the current. The boost-half-bridge converters results in minimal number of semiconductor devices and low cost. The repetitive current controller is used to reduce the total harmonic distortion and current regulation and high power factor is will be achieved with the help of this controller. Fast dynamic response also will be achieved during the solar irradiance change. The boost half-bridge converter is incorporated as the DC-DC conversion stage for the grid-connected PV Micro Inverter System. Benefiting from its circuit simplicity, ease of control, and minimal semiconductor devices, it will achieves the promising features such as low cost, high efficiency, and high reliability. In this work ramp change algorithm is used. While using the ramp change algorithm the panel tracks the solar irradiance slowly. This makes the panel to receive the solar irradiance in all positions. The simulation is done using the MATLAB software and the performance of the system also analysed.