MULTIVARIABLE FUZZY CONTROL STRATEGY FOR AN EXPERIMENTAL CHILLER SYSTEM

摘要

A multivariable fuzzy controller was developed and implemented for the regulationrnof the secondary fluid temperature in a chiller using both the rotation frequenciesrnof the pump and the compressor as manipulated variables. Itsrnperformance was measured using the integral of time-weighted absolute errorrn(ITAE) index and the energy consumption. The proposed control strategy provedrnable to adequately control the chiller in all experiments. For comparison purposes,rnsimilar experiments were carried out with fuzzy control strategies in which onlyrnone variable was manipulated at a time. Comparing the performance of the proposedrncontrollers with the fuzzy single input–single output controllers for regulatoryrncontrol, a mean percentage reduction of at least 88.5% was observed in thernITAE. Good results were also observed in control effort and energy consumption.rnBesides, the implementation of the control strategy was quite simple.