| Recently,the development of various industries has taken a qualitative leap.The housing construction of urban residents has also been progressing with the good times of economic development,and the heating demand of residents in winter is also increasing.The most important part of central heating system is the heat-exchange station.Therefore,the control level of heating temperature of the heat-exchange station directly determines the heating experience of consumer.To sum up,the intelligent control of heating temperature is imperative.This paper focuses on the research and analysis of the central heating system of residential quarters in the High-Tech Industrial Development Zone of Longjing,Yanbian Chaoxian Nationality Autonomous Prefecture,Jilin Province,and optimizes the water supply temperature control of the heating system and develops the heating monitoring system.The main research work of this paper is as follows: Firstly,analyze the characteristi of the central heating system and summarize the main controlled parameters as the supply water temperature of secondary pipe network,the D-value between the pressure of supply water and the pressure of returned water of secondary pipe network.Through the research and analysis of the control system of the heat exchange station,the set value of the water supply temperature of the secondary network is manually set or set in different time periods with the outdoor temperature as a reference,and the control is formulated from the perspectives of controlled parameters and equipment control program.According to thermodynamics,the heat transfer process of the plate heat exchanger is studied,and the mathematical model of the plate heat exchanger is established by the mechanism analysis method and the system identification method.Aiming at the problems that the traditional PID control can not meet the control requirements due to many interference factors and the time-varying temperature control object model of the heat exchange station,I propose to optimize it by using self-adaptive fuzzy-PID control.The simulation results show that the self-adaptive fuzzy-PID control algorithm has better control effect than the traditional PID control.According to the control requirements of the heat-exchange station,the hardware selection and program design of the control system are carried out,to design the procedures of self-adaptive fuzzy-PID control of the supply water temperature of secondary pipe network and control of water pressure difference between supply and return of secondary pipe network in heat-exchange station.The operation of a heating cycle of the heat exchange station monitoring system and the PLC-controlled heat exchange station control system of Kingview can be seen that the heat exchange station using self-adaptive fuzzy-PID control will control the temperature of the secondary network water supply more quickly and stably. |
