Frequency Conversion Of Highway Tunnel Ventilation Control And System Realization

According to the advanced technique of automation, network and control, this thesis studies the highway tunnel ventilation control system and puts forward a high performance and saves on energy VF ventilation control system, which can adapt to different length tunnels.This thesis explains tunnel ventilation system's energy-saving principle of blower speed according to characteristic curve of running tunnel pipeline and blower, states principle on choosing wind pressure control points and builds math models of tunnel ventilation system.Tunnel ventilation process is approximately a system of time lag of first order, real time control of wind pressure in tunnel pipe is adopted self-tuning fuzzy PID. The theory of fuzzy controller is analyzed in detail and a self-tuning fuzzy PID controller of VF speed ventilation is designed, and the simulation research on ventilation process of the system is introduced by using SIMULINK toolbox and fuzzy logic control toolbox in MATLAB. The step response character of fuzzy PID control is analyzed through simulation, the tunnel ventilation system non-linear, yawp and time lag restraining ability enhancing is expatiated.By using CS1-series PLC DeviceNet field bus locale controller network, through Ethernet communication , Controller Link network communication , transducer communication and protocol macro communication between locale controller and serial device, the locale equipments real time control is achieved. Develops the controlling program with the help of CX-Programmer, a kind of PLC programmer software, and the convenient and brief monitor computer software of the system is designed by using the software of kingview6.51.