the STATCOM has 4 PI controllers:
i) one PI for ac voltage regulation
ii) one PI for dc voltage regulation
iii) two PI for d and q axis current controllers.
If the MATLAB PID-tune tool is used for tuning of PI controllers, all the PI controllers cannot be tuned simulataneously. Even if 1 PI controller is tuned to give desired response, while tuning of other PI controller, the response of the first PI controller is affected.
Tuning using trial and error method also doesnt work.
What are he other ways of tuning these PI controllers? How do I tune all the PI controllers of a STATCOM?
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