A Design Of Pressure-superposed Water Supply Control System Based On PLC And Frequency Converter

With the rapid advance of science and technology,people's li fe tends to high standard,high quality and modernization.In the residential water,industrial water and all kinds of tap water and other water supply system,the use of traditional water tower,high water tank,air pressure booster equipment,covers an a rea of large,maintenance difficulties,serious waste of energy.Therefore,it is already a pressing matter to rationally use electric energy and water resources,ensuring the normal water supply of the residents' living water,changing past situation of low degree of automation,backward technology for high-rise buildings,municipal and residents' water supply.Pressure-superposed water supply control system based on PLC and frequency converter has been widely used in the modern high-rise residential,which not only can ensure residents' living and firefighting water supply,but also can take advantage of frequency conversion technology to meet the water demand and save electric energy most.In this paper,the following aspects of research work:1.Based on the energy-saving scheme of superimposed water supply demonstration.Overlapping water supply technology is the use of municipal pipe water supply pipe network pressure,and the general frequency control water supply compared to energy-saving effect is more obvious.(Fuzzy control)and the choice of water supply mode(high water storage tank + frequency conversion stacking)and the control system design(Pressure transducer + PLC general frequency changer + configuration software)are introduced in this paper fr om the characteristics and influencing factors of water supply.2.The water supply system using the fuzzy PID control algorithm.The structure of the fuzzy control algorithm is analyzed,and the design strategy of the fuzzy controller is given.The approx imate mathematical model and the simulation model of the fuzzy controller are established,and the simulation experiments of the traditional and fuzzy control are carried out.The results show that the fuzzy control algorithm has the advantages of short rise time,little overshoot,more stable regulation of pressure variation,better anti-interference ability,and superior control effect compared with traditional control.3.The application of PLC,inverter,touch screen technology to control the water supply system stacked.According to the requirements of system control,a variable frequency and constant pressure water supply system with PLC and inverter is designed,which has the characteristics of stable performance,reliable work and perfect protection.When the system fails,the fault signal can be detected,the implementation of the corresponding stop pump,shut down and alarm and other actions.In the monitoring interface of the touch screen,it can dynamically display the current water pressure,the current operation of the pump group,and can query the real-time data and historical data according to the actual needs,realize the remote monitoring of the equipment status and working condition control of the water supply system,And transmission site data,so that the water supply system with integrated control and management functions.4.Experiments and energy-saving analysis of stacked water supply.Based on the energy saving device,the experiment of superimposed water supply is carried out,which proves that the water supply has good energy saving effect.The actual energy saving rate of the laminated water supply is compared with the theoretical energy saving rate,and the actual results are in accordance with the theoretical research.It is of great practical significance to study the water supply system of PLC and frequency converter,and adopt fuzzy PID control algorithm to achieve steady,rapid control and good control effect on water supply pressure of pipe network,and realize energy saving and consumption reduction.