Today and in the future, the increase of fuel price, deregulation and environment constraints give more opportunities for the usage of the renewable energy sources (RES) such as wind and solar are used in power systems. The integration of RES into a micro grid can cause challenges and impacts on micro grid operation. The Photovoltaic system consists of PV panels connected through DC-DC converter and DC-AC inverter to the grid and maximum power point tracking is obtained by using MPPT algorithm. The control strategy of 100kW photovoltaic grid-connected inverter is proposed such as MPPT, current control and voltage control. The precision and effectiveness of this control strategy are verified by the computer simulations using MATLAB/SIMULINK. The system is proved to be effective with reduced harmonics while injection of power from PV to grid by maintaining constant DC bus voltage using PI controller.
