基于现场总线的网络化变风量地温空调系统设计

Design of Network VAV Geothermal Air Conditioning System Based on Field Bus

基于西门子Profibus现场总线技术,提出网络化地温空调系统方案,主站采用西门子PLC控制方式,监控功能采用WinCC组态软件实现,主站与从站之间采用Profibus-DP进行通信,主站与上位机之间采用MPI通信协议。空调末端系统采用变风量控制方式,有效实现节能。末端采用压力无关型控制,针对温度的非线性、大滞后、变参数的特点,结合模糊控制、PID控制与改进型Smith预估控制的优点,设计了改进型Smith预估补偿控制器,并进行了仿真研究。结果表明,该系统适应能力强、鲁棒性好,其空调系统工作稳定且节能,有一定的应用价值。

Based on Siemens Profibus field bus technology, a networked geothermal air conditioning system is presented. Siemens PLC control is used by masters, and monitoring functions are realized by using configuration software WinCC. Master and slave communicates through Profibus-DP, and the master and the host computer communicates by using MPI protocol. Variable air volume control mode is used by air terminal system, which can effectively achieve energy conservation. Terminal irrelevance control is adopted, with fuzzy control, PID control and modified Smith prediction control, effectively overcomes the shortcomings of nonlinear, big lag and variable parameter of the temperature. The results show that the system has strong adaptability, good robustness, and the air conditioning system works stably and energy saving, which has certain application value.