Abstract
The authors proposed the automatic voltage regulator (AVR) of synchronous generators using a self-tuning controller (STC) which has the adaptation for the dynamics of plants. For the closed loop system and the controller are stabilized by setting the weighting factor in the evaluating function, the control results are affected significantly by the value of the weighting factor. Then, the auto-tuning of the control parameters is desired. It is necessary to establish the stable control strategy by tuning the weighting factor in real time under the guarantee of the stable performances.
In this paper, the auto-tuning AVR of synchronous generators based on the generalized predictive control is proposed. The number of predictive steps are decided for the stable system by arranging the poles of the closed loop system. Then, the decision method of the weighting factor is introduced by assigning the pole of the controller in the stable region. The sequential least-square identification using the supremum trace gain method is adopted for the identification method. The no-load step response and the response for the closing and breaking of load are discussed by the simulation and the experiment using the microprocessor-based control system. Thus, the validity of the proposed AVR is confirmed.
