Department of Mechanical Engineering MEEN 651 Control System Design Dr . Alexander G . Parlos
نویسنده
چکیده
In many control system design problems a mere change in the controller (proportional) gain cannot satisfy desired specifications. As a result controller dynamics are introduced to alter (compensate) the overall (closed-loop) system dynamics. There are two widely used techniques for dynamic compensation. Lead compensation acts mainly to lower the rise time and decrease the overshoot of a feedback loop. It approximates the effects of derivative control. Lag compensation acts mainly to lower steady-state error, and as such it approximates the effects of integral control. In many instances, both lead and lag compensation are used simultaneously resulting in lead-lag compensation. We can summarize the compensation characteristics, as follows:
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Department of Mechanical Engineering MEEN 651 Control System Design
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