Unstable Closed Loop Poles
조회 수: 3 (최근 30일)
이전 댓글 표시
I have a plant transfer function gs which is stable on its own but the feedback loop is unstable because a pole appears on the right hand side of imaginary axis. How can I go about making system stable? I'm trying to make a controller similar to what's shown below with a lag compensator but I think I need to remove the unstable pole first.
gs = tf([-15.06 14.3 0.384], [1 2.383 8.791 0.2651 0.09111]) % plant transfer function
CLTF = feedback(gs,1) % results in closed loop poles that are unstable
댓글 수: 0
답변 (1개)
Net Fre
2021년 12월 13일
Using the rlocus function, you can see that up to a certain value of C (around 0.4 in your case) your closed loop will still be stable. Notice that the closer you get to that value your system will be closer to being unstable and will oscillate more.
Therefor you can start your controller design with a lower gain, such as:
CLgain = 0.25;
CLTF = feedback(CLgain*gs,1)
and try moving on from there.
댓글 수: 0
참고 항목
카테고리
Help Center 및 File Exchange에서 Classical Control Design에 대해 자세히 알아보기
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!