Modeling, Controller Design and Simulation of Power System Friendly Power Supply

Abstract

The    paper    is    based    on    the    performance    comparison   of   single-phase   diode-bridge   rectifier   and   the   proposed  front-end  converter  in  terms  of  the  Total  Harmonic  Distortion  (%THD)  of  the  line  current,  power  factor  of  the  system   and   ability   of   energy   saving   of   the   converter   by   capability  of  reverse  power  flow  action.  The  parameters  of  the  voltage control-loop for proposed converter are derived by two methods  named  Unity  Modulus  (Magnitude  Optimum)  method  and  Ziegler-Nichols  method.  The  parameters  obtained  from  both the methods are compared by the mathematical model for forward and reverse power flow mode of operation. The model is  generated  in  Simulink  toolbox  of  MATLAB  and  results  are  obtained for steady state, transient and dynamic conditions. It is observed that the unity power factor is maintained during all the conditions  for  various  loads.  Drastic  reduction  in  %THD  of  input  current  waveform  is  obtained  in  proposed  power  supply  with   an   added   advantage   of   regenerative   capability.   For   comparison of results of control-loops, a programming file (M-file)  is  also  generated  in  MATLAB  and  from  the  same  file  the  step-response   and   Nyquist   plots   are   obtained   for   system   control-loops.  The  experiment  results  are  also  obtained  for  the  prototype   converter   in   inverter   mode.   The   power   system   friendliness of the proposed front-end converter is quite evident from the results presented in the paper.