| As industrialisation accelerates and the amount of water used for production and living increases,urban water supply systems are faced with serious challenges.During the peak and trough stages of water consumption,the system is often unable to make timely adjustments due to the lagging feedback from the system,which not only results in a waste of water and electricity resources,but also causes severe fluctuations in water pressure and repeated opening and closing of valves,which can cause great stress on the inner walls of the pipes,resulting in ruptures and leaks overtime,threateningtheproductionsafety ofwatersupplycompanies.Traditional water supply methods rely on baffles and valves to regulate the flow of water,which is a serious waste of energy,impact on equipment and difficult to maintain,making it difficult to efficiently carry out urban water supply.The creation of variable frequency speed control technology has overcome the shortcomings of the traditional water supply model.At present,variable frequency constant pressure water supply has basically been commonly used in waterworks enterprises,effectively improving the impact of water pressure fluctuations on water-using equipment,but the conventional PID control method of fixed parameter adjustment is not sufficiently adaptable to the non-linear,time-varying and large inertia characteristics of the water supply system.Therefore,an intelligent PID control system is needed to improve the stability ofwaterpressureinthewatersupply network.The article firstly analyses the working principle and energy saving principle of the frequency-controlled water supply system,and compares the flow regulation methods of the water supply system from the basic characteristic curve,pointing out the problems of the traditional water supply method andtheadvantagesofthefrequency-controlledwatersupply.By analysing the problem that conventional PID control is difficult to adapt to a multi-variable water supply system and combining the characteristics of fuzzy control,it is proposed to combine fuzzy control with PID control to form a new intelligent control strategy,taking a water plant in Anhui Province as the object and designing a fuzzy PID controller suitable for the water supply system.The overall design steps involved include the fine division of the theoretical domain,the determination of the affiliation function,for the establishment of the fuzzy rules,the method of how toclarifythemandtherectificationofthefinalparameters.Combined with the characteristics of the water supply system,the mathematical model of the water supply system is established.And using matlab to carry out simulation research on traditional PID control and fuzzy PID control without and with disturbance,with a constant water pressure of0.35 MP as the control target,the simulation results show that fuzzy PID control can reduce the system overshoot from 20% to 7%,and at the same time can significantly improve the response speed,reduce the number and amplitude of oscillations,strong anti-interference ability,and obviouslyimprovethesystemdynamicperformance.The fuzzy PID control is practically applied to the constant pressure water supply system of a water plant in Anhui province.The design was combined with the determination of the type of equipment for the control system,the specification of its parameters,the design of the circuit,the allocation of the I/O port terminals and then the design of the control flow of the water supply system,and the design process of the PLC program and the configuration screen of the monitoring system are illustrated.Finally,the process of implementing the fuzzy PID control algorithm is illustrated,andtheapplicationshows thatthefuzzy PIDcontrol hasa goodconstantpressureeffect.Figure[48] Table[9] Reference[65]... |
