A model reference robust control with fast time-varying parameters

In this paper, model reference robust control for linear plants with relative degree greater than one and fast time-varying parameters is investigated. A new algorithm is proposed based on the earlier research. It is shown that by applying a special transformation to the tracking system, the L_∞ bound of the tracking error can be achieved, and both the tracking performance and the control effort can be improved significantly. Furthermore, the strictly positive real condition, which is an essential assumption of the earlier design, can be removed.