دانلود Effects of load modelling on analysis of power system voltage stability

Abstract

Voltage  stability  is  a  major  concern  for  viable system operation. Much  of   the  work  in  this  area  has focused  on the  use  of    the  P - V    curve  as  a  tool for  system  voltage security  assessment. This  paper  examines  the  effects  of different load  models upon this analysis method and discusses  some of its limitations.  Both  static  and dynamic load models  are  considered. The  relationship between  the nosepoint of   the curve,  the point of   system bifurcation,  and the stability  of   different  regions of   the P - V   curve  are also examined.  It is shown that the load model has a significant effect  in  the  determination  of   system  voltage  security.  In particular,  the  paper  shows  that  whether  a  system  loses stability  by a  Hopf   bifurcation  is very dependent  upon  the load dynamics. Additionally, an analysis technique is  discussed for  quantifying  the  voltage  security  of   a  power system.