Wind Gust Protection Algorithm for Non-Pitched Control Wind Farm

Abstract

A  significant  capacity  of  wind  energy  has  been recently  interconnected into  the  public  grids  to  utilize  this  clean energy  for  electricity   generation.  The  efficient  utilization  of wind-converted  energy  requires  stable  operation  of  wind  farms under wind gust conditions. This paper focuses firstly on defining the  critical  wind  speed  together  with  the  corresponding  critical voltage and current of the wind generators to keep the farm in its stable  region.  Secondly,  an  over  speed  protection  scheme  is proposed  to  trip  out  the  wind  farm  before  reaching  its  unstable region. Thereby, the critical clearing time  for the proposed   over speed  relay  is  determined  in  coordination  with  the  wind  gust speed  and  the  corresponding  critical  voltage  and  current.  The simulation  results  indicate  that  the  proposed  over  speed  turbine protection  improves  significantly  the  grid  connected  wind  farm system performance under wind gust conditions.