POWER QUALITY IMPROVEMENT OF DG USING SOFT COMPUTING TECHNIQUE

Interconnection of renewable energy sources (RES) in the distribution systems are increases using interfacing power electronics converters. This paper presents a novel control strategy for achieving maximum benefits from these grid-interfacing inverters when installed in 3-phase 4-wire distribution systems. The inverter is controlled to perform as a multi-function device by incorporating active power filter features. The inverter can thus be utilized as: 1) power converter to inject active power generated from RES to the grid, and 2) shunt APF to compensate load current harmonics, current unbalance, load reactive power demand and load neutral current. All of these functions may be accomplished either individually or simultaneously. In this paper simple PV system and interfacing inverter is presented. Finally synchronization to the grid with proposed control strategy for the inverter with MATLAB/Simulink simulation studies. Further replacing PI-regulator with fuzzy logic controller, results of power quality is improved