دانلود Distance Protection Solution for a Converter Controlled Microgrid

Abstract

Distance relay response in the presence of a converter  dominated  microgrid  system  has  been  analyzed  in  this paper. Converter structure and control mechanism are presented and  a  new  method  is  proposed  to  limit  fault  currents  in  faulted phase/phases by reducing the converter output voltage. A method of  analyzing  unsymmetrical  supply  voltage  using  symmetrical component  theory  is  proposed,  where  it  has  been  assumed  that voltage  source  converter  (VSC)  supplies  unbalanced  voltages  in the  event  of  a  fault.  Performance  of  distance  relays  with  Mho characteristics  are  evaluated  in  a  radial  distribution  feeder  for both phase and earth unbalanced faults. The results are validated through PSCAD simulation and MATLAB calculations.