Chaos optimization variable arguments PID controller, and its application to main steam pressure regulating system

In view of engineering practice, an improved Variable Arguments P+I+D (VAPID) control strategy is proposed. The new control method has good control effect not only for regulating but for set-point following. It has strong robustness and disturb-resistant ability even when applied to large time delay system, which is very common in industrial production process. In order to obtain good effect while VAPID is applied, mutative scale chaos optimization algorithm is used for tuning of VAPID. Both computer simulation and field application in main steam pressure control system, which is a controlled plant with parameters uncertainty and multi-disturbance and large time delay, show that chaos has global optimization ability because of its stochastic property, ergodic property and "regularity", and is successful and effective for VAPID controller\´s optimization.. Chaos optimization and VAPID has preferable application future.