TUNING PID CONTROLLERS WITH INTEGRAL PERFORMANCE CRITERIA PID 相关论文[专业论文].pdfVIP

481 TUNING PID CONTROLLERS WITH INTEGRAL PERFORMANCE CRITERIA M Zhuang D P Atherton University of Sussex, U K INTRODUCTION COMPUTATION ALGORITHMS Proportional-Integral-Derivative (PID) controllers , Use of an integral performance criterion often re- also called three-term controllers, are still used ex- sults in a better closed-loop response of a control tensively in the process industries because of their system than heuristic tuning methods since the robust performance and simplicity. Three parame- method takes into account the whole transient re- ters of a PID controller must be determined to tune sponse of the system . In this section methods to the process to obtain a satisfactory closed-loop per- tune PID controllers using inte ral performance cri- formance. Thus methods to tune the parameters of teria are discussed and a new %sign method is de- PID controllers are very important for the process veloped. industries. The basic PID controller can be connected to the Several methods for determining PID controller control loop as a series compensator as shown in parameters have been developed during the past Fig. 1.The general form of a PID controller is fifty years Astrom PI. Some methods employ information about t e open-loop step response , other methods use some knowledge of the Ny uist curve of the plant, for example th