Reducing harmonics in micro grid distribution system using APF with fuzzy logic controller

Abstract

Renewable generation affects power quality due to its nonlinearity, since solar generation plants and wind power generators must be connected to the grid through high-power static PWM converters. The nonuniform nature of power generation directly affects voltage regulation and creates voltage distortion in power systems. This new scenario in power distribution systems will require more sophisticated compensation techniques. Although active power filters implemented with three-phase four-leg voltage-source inverters (4L-VSI) have already been presented in the project. In distribution systems, the load has been a sudden increase or decreases and it is like as nonlinear loads so the load draw non-sinusoidal currents from  the  AC  mains  and  causes  the  load  harmonics  and  reactive  power,  and excessive  neutral  currents  that  give  pollution  in  power  systems.  Most pollution  problems  created  in  power  systems  are  due  to  the  nonlinear characteristics  and fast  switching of  power  electronic  devices.  Shunt  active filter based on current controlled PWM converters are seen as a most viable solution.  This  project  presents  the  harmonics  and  reactive  power compensation  from 3P4W micro-grid  distribution  system by  fuzzy  controlled shunt  active.