An Alternative Inverter Control Strategy for Grid Connected Solar Photovoltaic (SPV) System

Abstract

Use of distribution generation (DG) system in large scale is becoming an encouraging scenario for electric power generation. For this purpose, three-phase voltage source inverter (VSI) carried out a major role to link between DG and grid. The inverter must be operated smoothly and stay connected during voltage sag or any kind of disturbances takes place. Till date, several control strategies have been invented and also implemented in different systems globally to maintain the healthy operation of the inverter. This paper proposes an alternative method to control the voltage source inverter of grid-connected solar photovoltaic (SPV) system. The proposed work is focused on an alternative inverter control process based on a synchronously reference frame phase-locked loop (SRF-PLL). A modified dual-loop feedback control strategy has been introduced and implemented in the proposed system to show effective control of a three-phase grid-connected voltage source inverter. All the simulations have been carried out and verified in MATLAB/SIMULINK environment.