A new approach to the problem of input saturation and controller windup in model-based digital controllers

Two anti-windup algorithms, the optimal set-point sequence algorithm (OSSA) and the simplified set-point sequence algorithm (SSSA), are presented in this paper to deal with the problem of controller windup and the subsequent degradation in output performance as a result of set-point changes. These algorithms are computationally simple and extremely effective. The proposed anti-windup algorithms use an understanding of the causes of the problem in order to prevent the problem from occurring or minimizing it in the first place. The author has shown through simulations, and where possible through experimental verifications, that the results are applicable to single-input single-output, and multiple-input multiple-output processes.