The Study Of Model Free Adaptive Control

As we all know that the modern control methords require higher accuracy mathematicalmodel but which is difficult to set up. In order to get ride of the shackles of systemmathematical model, the Model Free Control methord comes into being. With a newlyintroduced pseudo-gradient (or pseudo-Jacobi matrix) and pseudo-order, Model Free AdaptiveControl only uses I/O information of control system, can achieve the parameter and structureadaptive.Standard MFAC algorithm can be used for most process. In order to adapt specialproblems and ensure stability, this paper improved the standard algorithm for lag nonlineardiscrete system, proposed improved MFAC algorithm. Explain the linearization method ofSISO, MISO, MIMO lag nonlinear discrete system based on tight format, partial format andfull format, using dynamic linear time-varying model to replace the gengral one. Designseries of MFA controller and introduce rigorous theoretical proof and stability analysis forSISO lag nonlinear discrete system based on tight format, partial format and full format.By compared the simulation and esperimental results of typical process control systemwith the improved MFAC, standard MFAC and PID algorithm, it shows that the improvedMFAC has superior anti-lag, dynamic characteristics and better robustness. Confirmed thenew scheme is feasible.Finally, the improved MFAC algorithm is used in boiler feed water control system,which is a self-unbalance part and less controllable. The control results are not satisfactorywith the traditional methords. After applicating the improved MFAC algorithm, it couldachieve better control effect.