Simulation Research On A Kind Of Nonlinear Feedforward PID Control Method

Classical PID controller has been widely used because of its single structure,easy to use ,and so on. But PID controller has its limitation, where its linear combination brings the contradiction in speediness and overshoot. In addition , reference input usually is non-differential. So its error signal usually is non-differential, which limits PID controller's use.Professor Han in Chinese Academy of Sciences has put forward a new kind of nonlinear PID controller. This new controller succeeds to the PID controller's advantage of the independence on models and improves on the PID controller's shortcoming.In this paper, considering some special industry objects, a kind of feedforward nonlinear PID controller has been put forward based on the nonlinear PID controller, three kinds of control methods are applied to some special industry systems, they are classical PID controller , nonlinear PID controller and the nonlinear feedforward controller. From comparing them , we can find that the nonlinear feedforward method which is presented by this paper not only has the characteristic of high "robustness and adaptability" that nonlinear PID controller has , but also has higher response speed and shorter regulating time.