An almost disturbance decoupling temperature and humidity control strategy of air-handling units

Abstract

In the article, for air-handling units (AHUs), an almost disturbance decoupling temperature and humidity tracking controller is constructed directly based on dynamic nonlinear models by backstepping. Compared with model-free techniques such as proportion integration differentiation (PID) and so on, the proposed scheme uses the known information effectively in the model to ensure control accuracy. Different from linearization methods, the almost disturbance decoupling method is employed to attenuate the impact of disturbances. Without fuzzy logics, the proposed controller requires less computation since the exponential explosion of computation caused by the increase of fuzzy rules can be avoided. To show the practicability, the outdoor temperature and humidity, strength of humidity source, and heat load are considered to be time-varying. Finally, compared with PID, feedback linearization and fuzzy controllers, the effectiveness and superiority of the constructed controller are proved.