Thyristor Power converter Control

Hello,

I am trying to understand the Thyristor power converter that MATLAB has assembled in the demo: power_RegulatedThyristorRectifier.

In implementing the PI controller for the converter, why is the angle alpha taken as 90 - Ce, where "C" is the PI controller and "e" is the error. Where does this calculation come from? I have read the documentation on this demo, but no information is provided for this calculation.

Thanks!

Answer 1

[Sabin]

This is part of the control strategy. A reference 90 degrees is used for the firing angle and this angle will be adjusted around 90 using the output of the PI controller such that the expected DC-link current is obtained.