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Indexed by:会议论文

Date of Publication:2015-01-01

Included Journals:CPCI-S

Volume:8

Page Number:824-828

Key Words:setpoint tracking; internal model control; PID controller; actuator saturation; performance assessment

Abstract:The purpose of control loop performance assessment is to find a proper method to measure the difference between the actual performance and the predicted performance of the industrial control loop and further identify problems and make adjustments. Therefore, a proper basis to evaluate the correspondingly performance is very important. Actuator saturation is a common phenomenon in the industrial production. In order to establish a performance index accurately, the actuator saturation is need to be taken into account. This paper proposes a method to assess the tracking performance of PID controller under actuator saturation. The optimal controller parameters can be expressed as the function of saturation level based on curve fitting. The lower bound of the step response performance has been established. By comparing with the lower bound through internal model control (IMC) principle regardless of saturation, it can be shown that the proposed method is more reliable. The validity of the new performance index is illustrated by simulations.