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Homework Help: Compensator for a 6th Order System

  1. Jan 11, 2013 #1
    1. The problem statement, all variables and given/known data

    I have a sixth order system with two complex dominant poles shown in the root locus plot attached. This is done using sisotool. I have requirements of 5% overshot and 1.5sec settling time which I have to satisfy. These are shown as border lines with yello shading on the root locus plots.

    To satisfy the requirements, a compensator is needed to twist the locus out of the border while varying the proportional gain. I managed to get the two dominant poles out of the border by placing 2 complex zeros close to the origin but could not get near to the requirements.The pole closest to the origin is real and negative but it is inside the border with a zero very close to it. Will this pole effect me since it is real? If yes what is the best way to move it out of the border?

    2. Relevant equations

    3. The attempt at a solution

    Attached Files:

  2. jcsd
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