CONTROL OF GRID CONNECTED SOLAR PHOTOVOLTAIC SYSTEM INCORPORATING LOAD HARMONIC COMPENSATION

Abstract

The demand for energy worldwide is increasing rapidly year by year and scientist all over the world is looking for the alternative source of energy. Among, various available renewable energy sources, solar photovoltaic (SPV) energy is considered to be most reliable, environment friendly, pollution free and unlimited in nature. The solar energy is directly converted into electrical energy by solar cell/ module. The characteristics of PV depend upon irradiation and temperature. The temperature and the irradiation of the solar cell depend on the atmospheric conditions. Hence, it is essential to track the maximum power point (MPP) in any conditions to assure that the maximum available power is obtained from the PV panel. When PV is interfaced to the grid power quality problems may arise due to use of power electronic devices in the form of voltage source converter (VSC) for coupling. In this proposed work solar PV is modeled using single diode electrical equivalent circuit of solar cell and the characteristics of PV module are generated. The Perturbation and observation (P&O) technique is modeled and implemented. The maximum power point (MPP) is obtained using MPPT and dc-dc boost converter. Complete evacuation of generated power from PV source is done using maximum power tracking. This improves the overall system efficiency. Moreover, the Grid side inverter is utilized to compensate the load current harmonics and load reactive power demand. This enables the grid to always act at unity power factor. Solar PV system is controlled and synchronized to grid using synchronous reference frame theory (SRFT) algorithm. A variety of linear/non-linear load conditions are considered.