A new approach to series compensation of control systems

The specification problem is re-examined for a realistic fixed plant with 1-zero and 4-poles. A new concept is introduced, which is the required horizontal symmetrical ( alpha , 1/ alpha ) band of minus one slop (BMOS) around magnitude equals unity on a straight-line Bode plot. With these results, series compensation becomes a very simple graphical problem of moving straight lines around, where the various trade-offs are obvious.<
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