Coupled Feedforward and Feedback Control Strategy of Parallel Hybrid Filter for Harmonic Mitigation.

Abstract

The   strategy   features   a   small   sensitivity   against a disturbed supply voltage system and enables us to  set  grid  phase  currents  in  the  phase  with  respective  voltages.  The  expected  properties  of  the  PHF  control  system have been confirmed by experimental tests in the laboratory.  The  data  show  that  the  modified  control  strategy yields better results than those obtained by using control systems reported previously, especially in case of an unsymmetrical and non-sinusoidal voltage system and the  demand  of  zero  reactive  power  withdrawn  from  the  grid.