한국해양대학교

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RCGA에 기초한 비선형 PID 제어기의 설계

Title
RCGA에 기초한 비선형 PID 제어기의 설계
Author(s)
소건백
Publication Year
2014
Publisher
한국해양대학교 대학원
URI
http://kmou.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000002174408
http://repository.kmou.ac.kr/handle/2014.oak/8428
Abstract
Over decades PID controller has proven to be a very useful instrument in industrial sites. The generality of PID controllers allows easier design and tuning compared to other complicated controllers in addition to excellent control performance, and enables field engineers to operate them relatively easily. However, despite these advantages, conventional linear PID controllers display a conflicting relationship: a fast response requires large gains which, in turn, gives rise to a large overshoot. There is a tradeoff between fast response speed and less overshoot in actual applications

This thesis presents a nonlinear PID controller that can enhance the tracking performance of the conventional linear PID controller to achieve a desirable fast response with low overshoot. This is performed by introducing a new type of nonlinearities in the controller gains that are time-varying functions in terms of the error and/or error rate. Then, the parameters of the nonlinear PID controller are optimally tuned by a real-coded genetic algorithms (RCGA) such as the integral of time-weighted absolute error (ITAE) performance index is minimized.

A set of simulation works performed on four systems shows the feasibility of using the proposed method.
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제어계측공학과 > Thesis
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