Simulation of Grid Connected PV System with Power Quality Improvement Using Fuzzy Logic Controller

The increased power demand, the depletion of the fossil fuel resources and the growth of the environmental pollution has led the world to think seriously of other alternative sources of energy. So renewable energy resources (RES) are being connected to the distribution systems, mostly done by using power electronic converters. A new control strategy for achieving maximum advantage from these grid-interfacing inverters which are when installed in 3-phase 4-wire distribution systems is given in this paper. With the inverter control, the inverter can be used as a multi-function device, which includes the function of: 1) power converter to inject power generated from RES to the grid, and 2) shunt APF to compensate current unbalance, load current harmonics, load reactive power demand and load neutral current. These functions of the inverter can be done either individually or simultaneously. The proposed inverter with the control when connected, helps the 3-phase 4-wire linear/non-linear unbalanced load at point of common coupling appear as balanced linear load to the grid. In this control strategy fuzzy based system is used for performance improvement with MATLAB/Simulink simulation studies, the proposed control technique is demonstrated and evaluated here.