Grid connected solar PV systems are increasing dramatically from year to year due to thernincrease of global interest in renewable energy sources and growth in energy demand. In thesisrnwork, the designing and modeling of grid connected PV system using synchronously rotatingrnreference frame (SRRF) has been carried out. In this thesis, the important points and literaturernregarding the elements in a PV system, an inverter and grid connection system have been studiedrnand reviewed.rnThe photovoltaic model is used to simulate actual PV array characteristics, and an MPPT methodrnusing incremental conductance method is proposed in order to control the DC-DC boostrnconverter to extract the maximum power from the PV array. The inverter used in this thesis workrnis three-phase two-level voltage source inverter (VSI) which is controlled using synchronously dqrnreferencernframernwithrnspacernvectorrnpulsernwidthrnmodulationrn(SVPWM).rnTherncontrolrnstructurernforrnrnthernrninverter is designed by synchronous reference frame with phase locked loop (PLL). Thernphase locked loop is used to acquire the available necessary information of grid voltage. AnrnLCL-filter is used to interconnect the output of inverter to the grid and used to attenuate the totalrnharmonics distortion (THD) present in the output current and voltage of the inverter. The systemrnmodel is developed using MATLAB/SIMULINK environment.rnThe efficiency of the overall system is around 97% which is improved more than the previousrnrelated work whose efficiency is around 96%. The total harmonic distortion of the grid current isrn0.88% which is less than the previous work that is 1.42%. For resistive load change, the THD ofrnthe grid current and inverter current are 0.88%, 0.91% and 0.93%, and 0.86%, 0.87% and 0.87%rnfor a load of 1.5kW, 2.5kW and 3.5kW respectively. For a nonlinear load change, the THD ofrnthe grid current and inverter current are 0.61%, 0.51% and 0.50%, and 0.12%, 0.12% and 0.12%rnfor a load of 100â„¦, 125â„¦ and 320â„¦ and C = 3000ÂµF respectively.