Comparative studies of three adaptive controllers

The performance of three adaptive controllers has been compared with experi mental studies on a VVS-400 Heating/Ventilation System. The control algorit hms are Generalized Predictive Control (GPC), an adaptive PID Controller (A PC) based on Dahlin algorithm and the VVS-400 Heating/Ventilation System lo cal controller-a Fuji PID auto-tuner. For the on-line identification module of the first two adaptive control algorithms, the recursive least-squares estimation technique is implemented. It is demonstrated that the two model- based approaches outperform the PID auto-tuner. Moreover, the adaptive PID controller compares favorably with a much more sophisticated GPC. (C) 1999 Elsevier Science Ltd. All rights reserved.