Coordinate Control On Variable Air Volume Air-Conditioning System

Variable air volume (VAV) air-conditioning system is superior to the other air-conditioning systems for its economic and flexible performance, which has been the main current of air-conditioning system effectively. However, the VAV air conditioning control system is a great inertia, pure lag, high nonlinear and strong coupling complex system, so the conventional PID control can't obtain a perfect result, and its application in China is still very limited. In order to achieve targets for energy conservation, and improve energy efficiency utilization of domestic air-conditioning system, so, it's particularly important to research the control method of VAV air-conditioning system.This paper simply introduced the controlling principle and according to the mathematic model of the main control loop of VAV air-conditioning system, From the control strategy of VAV air-conditioning system, to supply air temperature control loop, mainly adopt PID control,fuzzy adaptive PID control,Smith predictive control,adaline adaptive PID control and dynamic matrix control, and then for the coupling of the main four-loop, the supply air temperature loop,air supply duct static pressure of the static pressure points loop,indoor temperature loop,the air concentration of carbon dioxide, of the VAV air-conditioning system, use the method of the diagonal matrix method and neural network adaptive decoupling algorithm decoupling control to study.Basis on the analysis theory, through MATLAB simulation test, compared to the traditional PID control, prove that the diagonal matrix method and neural network adaptive decoupling algorithm decoupling algorithm can effectively eliminate or reduce the strong coupling between the system, the response is very fast, and the system has a good self-adaptability and robustness.