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We have proposed two design methods of AC/DC thyristor converter current control systems with MRAC (Model Reference Adaptive Control). To linearize the input/output relation of the systems, we dealt with the constant term of the model in different ways. In the first method, we made a linear transformation of the control input, while in the second one, neglected the constant term and compensated modeling error by integral adaptation. Computer simulations and experiments have shown that the control performances of the MRAC systems are much better than that of PI controllers. But in the first one, as the variable vector is not persistently spanning, the convergence rate of estimated parameters is not as high as expected. The second one has better dynamic characteristics but its stability has not been proved in theory. This paper suggests a new design method in which the constant term is considered as a determinis tic disturbance. The feature of this method is : by introducing an equality equation which makes the term of disturbances unobservable apparently, we can eliminate the effect of disturbances, and can use the existing adaptive control scheme without disturbances whose stability has been theoreti cally proved. Computer simulations and experiments show that the new method can obtain better responses than the old ones.

A Design Method of AC/DC Thyristor Converter Current Control Systems by using Discrete-Time MRAC with Deterministic Disturbances.