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tuning the pid controllers

gannamraju kumar
Intellectual 900 points

Hi,

Hi,I am tuning the 2 PID controllers(one is current and the other is voltage controller)using MATLAB AUTO TUNING.So,when i tune outer voltage loop first ,i got kp ,ki for outer loop(i took current loop as 1 ( means no effect)).But when i try to tune the current loop again for all the values of kp,ki values my system is unstable.By nature my system is stable(It is interleaved buck converter).Now i have 2 doubts.
1.How to tune the cascaded loops(PID controllers)
2.How to consider the sampling time for both the loops.Because voltage loop runs at 10 Khz and current loop runs at 50 Khz
 Kindly give me suggestions to tune two cascaded loops and if possible provide some supporting documents.
Thanks in advance