I have been assigned a control systems problem, where I am supposed to stabilize a system using a controller technique from the frequency domain. When I implemented the system on Matlab and calculated the phase margin of the system it turned out to be infinite. I am not exactly sure what that means.
Can someone tell me what exactly does it mean that the phase margin comes out infinite, and how can such a system be stabilised?
This is my code:
clc clear all close all num=; den=[1 0 -9]; sys=tf(num,den); bode(sys); [Gm,Pm,wcp,wcg]=margin(num,den)