VOLTAGE ORIENTED CONTROL – SIMULATION
are also good in our cases (infinite). Nevertheless, we feel that the delay margin is really too small compared to the system time constant.
ATTENTION, this analysis is probably too simplistic. We assumed that the converter and grid parameters are perfectly known and it’s not correct in reality. The cross coupling cannot be perfectly
cancelled and the estimated values are not exactly equal to the real values, that is :
,, . Another important point is that the analysis have been done in continuous time and should be also done in discrete time in order to be close to the real system (discrete controller).
More Nyquist and Bode graph are plotted in APPENDIX E.