Wind Turbines under Power-Grid Partial Islanding

Abstract

This   paper   proposes   a   study   about   a   partial   islanding  system  composed  by  a  wind  turbine  based  on  doubly-fed   induction   generator   (DFIG),   a   wind   turbine   based   on   permanent  magnet  synchronous  generator  (PMSG),  an  active  filter,  capacitor  banks,  non-linear  load,  and  the  grid  power.  Mathematical  model  of  systems  are  performed  by  both  field-oriented  control  (FOC)  and  virtual  grid  flux  oriented  control  (VOC). The objective is to analyze the voltage and frequency of point  of  common  coupling  (PCC)  due  to  the  islanding  of  grid-connected  electrical  power  systems  and  then  the  insertion  of  the  non-linear  load  on  the  system.  In  order  to  compare  methods  to  improve the power quality in PCC the use of capacitor banks and active  filter  are  considered  in  this  work.  The  whole  simulation  model   is   developed   in   PSCAD/EMTDC   environment.   The   simulation results are presented and discussed.