Solar energy is available in plentiful amount and it is more important than any other renewable energy sources, it may be utilized to produce electricity through photovoltaic (PV) energy conversion process. This paper briefly describes the analysis and modelling of both isolated mode and grid connected mode of operation of a 100 kW PV system by means of a suitable control scheme under different load conditions. The studied model incorporates perturb and observe based maximum power point tracking algorithm for the extraction of maximum power from the designed PV system. In the grid connected mode of operation, dual loop feedback control strategy is implemented. The simulation is performed under the platform of MATLAB/SIMULINK® environment.