Improved Kalman Filter Based Inverter Control for Reduction of Low Order Current Harmonics due to Isolation Transformers in Renewable Energy Sources

Abstract

This paper is focused on the analysis of a Kalman filter  performance  when  introduced  in  the  current  control  loop  of  a  distributed  generation  connection  inverter.  The  idea  is  to  use  this  kind  of  filter  to  reduce  the  harmonic  content  of  the  currents  injected  in  the  point  of  common  coupling.  The  study  has  been  performed  by  means  of  simulation  using  Matlab-Simulink  and  clearly  demonstrates  that  this  kind  of  control  system can improve the response produced by the inverters. The elimination  of  certain  well-known  noisy  harmonics  introduced  by an element such as the isolation low voltage transformer has been accomplished.