| From the viewpoint of saving energy and improving the indoor air quality, heating, ventilating and air-conditioning (HVAC) control systems are the most important part in the building automation systems (BAS). So it is significant to adopt efficient air conditioning methods to manage the energy management control (EMC) of intelligent building. At present, variable air volume (VAV) air-conditioning system is the main steam of the whole air conditioning system in china and abroad because of its large energy conservatioa However, since VAV system is multivariable, strongly coupled, nonlinear and time variant, its design, performance and management are more difficult than constant air volume (CAV) system, and stable control of the entire VAV system is focused in particular in chinaStudy on the stability, the key condition of the VAV operation, the paper divide the VAV system into AHU part and terminal part based on the coordination control strategy. Then the paper built the AHU and the terminal models through experimental methods. It analyses the coupling relations of the control loops in the AHU and the terminals. The paper applies the Adaline PID controller to decouple and control the AHU part of VAV air conditioning system based on the neuron adaptive decoupling control strategy. Coordinate control method based on the variable static pressure strategy is applied to the whole VAV air conditioning system since the intelligent building has distributed automation system. It makes the AHU part and terminal part form the whole system. The validation was made in the paper through Matlab simulation and experimental design. The results show that this decoupling and coordination control strategy is efficiency. The paper also gives the software of the decoupling and coordination control based on Visual Basic. It has friendly interface and exchange the data with Metasys system through the VB-DDE METASYS method. |
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