STUDY ON THE INFLUENCES OF SETTING DISORDER OF PID PARAMETERS AND THE OPTIMIZATION STRATEGY OF THE PARAMETERS

Abstract

This paper addresses the effects of fault and optimization of PID parameters in building air-conditioning systems. On setting disorder of PID parameters, the influence was made clear through experiments. It produced hunting at valve and increased ON/OFF frequency of the chiller larger than the difference of electricity consumption and the room's temperature fluctuation, etc. So we can say it is considered that the setting disorder is not noticed, even if only the room's temperature and electricity consumption are watched. On the optimization of PID parameters, optimum adjusting strategy using Genetic Algorithm (GA) was proposed. The strategy simultaneously searches PID parameters of VWV 2-way valve and VAV units. We verified the usefulness of the strategy.