Performance comparison of different voltage control schemes on distributed generation

Abstract

The   installation   of   Distributed   Generation(DG)  can  have  a  significant  impact  on  distribution  systemvoltage   regulation.   The   effects   vary   according   to   the   DGdevice:  in  particular,  synchronous  generators  present  voltagecontrol  systems  which  interfere  with  the  voltage  regulationof  the  distribution  systems.  The  paper  analyzes  two  voltagecontrol schemes for synchronous generators connected to MVdistribution systems. They are designed according to differentapproaches:  the  first  one  is  based  on  a  fixed-parameter  PIDregulator  whereas  the  second  one  employs  an  adaptive  self-tuning  technique.  With  reference  to  a  case  study,  the  twoschemes  are  compared  in  terms  of  dynamic  performance  anddynamic interaction with distribution system voltage regulation,which  is  performed  by  the  On-Load  Tap  Changer  (OLTC)  ofthe supplying HV/MV transformer.