Controller design for a Single-Stage Single-Phase Grid-Connected Solar PV Microgrid

The Solar PV based Microgrid is increasing in the small-scale power generation, with the rapid increase in tapping the potential of renewables in power generation. The grid-connected operation of such small-scale grid requires a proper control design operation for effective power injection into the grid line at rated voltage and frequency. This work studies the design of an Integral Terminal Sliding Mode Control (ITSMC) for the controlled switching of the Voltage Source Inverter (VSI), to regulate active power flow into the infinite bus. A 2kW Solar PV system coupled to a 1ϕ 230 V, 50 Hz grid is designed in MATLAB/SIMULINK platform to evaluate the controller performance. The controller response is seen to be robust and also the efficiency of power extraction from the PV source into the grid is achieved around 97% for varying irradiances. For oscillatory response during high temperatures, the controller proves to provide rapid switching signals tracking the deviations appropriately.