Researches And Designs Of The Fuzzy Control In The Speed-frequency Variable Water Supply System With Constant Pressure

As we all know, water is the main comoponet of the production and life. The shortage of energy is the restriction elements of our country economy development. Our this water resources and electrical energy short country was quite backward and low automaticity since long ago that in municipal water supply, high-rise construction water supply and industrial production circulation water supply. The potable water project is a very important problem for everybody. However, as the potable water project, the most important water supply this link at present actually has very many problems. The traditional water supply way cannot satisfy current social development and demand. Moreover the water supply quality directly is affecting people's living standard and enterprise's production efficiency. We should manage the water supply pipe network safely, stablely and economical reliablely that certainly must have tosatisfy the water supply characteristic, the advanced automated water supply control system.Along with electronic technology changing with each new day, power electronic device develops from the initial ordinary thyristor to the function integration with control, actuation and protection, appeared the intellectualized power circuit (IGBT)module and intelligent power module(IPM), they realized the higher speed of turn-on frequency, higher performance of the Lowly leads passes voltage as well as a large scale of power integrated circuit. Including logical control, power, protection, sensing and metrical circuit function that opened the new world for alternating frequency technique. Combination of Electronic Technology Development and Sinusoidal Pulse-Width Modulation (SPWM)that drive Application of frequency control in the constant pressure water supply system.The major task for this dissertation is that the Middle and Large Frequency Control Constant Voltage Water Supply is through the frequency conversion velocity modulation technology adjustment water current capacity to achieved the constant pressure water supply, the system finally controls the water pressure, the controlled member is timevarying, nonlinear, backward, the model unstable object. It can't make use of effective analytic formula or the mathematical model closed-loop control. It proposed the way that uses the fuzzy control in the Frequency Control Constant Voltage Water Supply. The fuzzy controller is the precise mathematical model that does not request to grasp the controlled the object, therefore fuzzily controls doesn't need to know the input-output mathematics existence relations, but mainly relies on the fuzzy rule and a fuzzy variable subordination function. With the fuzzy control technology realization pressure control that may greatly reduce the overshoot and oscillation. acquire the stable control effect. This design proposal enhanced the frequency conversion velocity modulation constant pressure water supply system stability, the reliability as well as the automatic control ability. In the promoting with great effort saves energy today, studies this kind of high performance, the economy constant pressure water supply system has the important practical significance for regarding labor productivity and reducing energy consumption.This main contents are:1. First I have carried on a more detailed summary to the Operation of Variable Frequency and Speed Regulation in working principle and energy-saving principle in the water supply system. In this foundation, proposed the frequency conversion water supply system design that was composed of 16monolithic integrated circuits 80C196MC and intelligent power module IPM.2. I have studied the constant pressure water supply control method, introduced the fuzzy control basic principle, the fuzzy control system composition and the fuzzy controller structure, proposed the fuzzy controller design. This system uses the two-dimensional Fuzzy Controller, and repeatedly adjusting after the computer off-line computation revises, finally I obtain the practical application the fuzzy control questionnaire, saves it in the monolithic integrated circuit, realization automatic inquiry control.3. I have introduced that it compose control circuit with the 80C196MC Single Chip and essential peripheral circuit , to water supply system pipe network pressure gathering, the flow sensor and its the processing electric circuit, the fluid position sensor and its the processing electric circuit, the electrical network voltage signal examination electric circuit, the electric current examination electric circuit, the liquid crystal display electric circuit as well as the frequency conversion inversion electric circuit and so on , all of this have carried on the design.4. I have designed a main program frame of frequency control constant pressure water supply system, the keyboard subroutine diagram, the fuzzy control subroutine diagram as well as the SPWM design.Main innovations as follows:1. Water pressure loop Control of the water supply system used the fuzzy control technology that makes prodigious advance realize the constant pressure control.2.The present paper introduced SPWM frequency control constant pressure water supply system that is composed with 16 bit Single Chip 80C196MC and intelligent power model IPM. 80C196MC Single Chip is specially designed by American Intel Corporation. The SPWM speed control system composed of Single Chip and intelligent power model that is simple, economical and practical, convenient. Because of strong control protection function and good adjustable-speed performance, it enhances Real-time Performance of System, also because this CPU was specially designed for industrial application, therefore had a higher reliability and immunity.3.In the frequency control system, The creating method and the realization technology of the SPWM signal are very important. There is a three-phase wave form generator in 80C196MC. It can output 6 SPWM signals through P6 hole. This article detail that with the function of 80C196MC own wave form generator, Generating three-phase SPWM wave form with hardware, directly control six switch tubes of Driving Converter that is simple in programming and CPU may set aside a mass of time to carry on all kinds of calculation, thus enhances speed adjusting performance of the system.In brief, towards the constant pressure water supply system, its itself is a non-linearity, the not easily grasped dynamic behaviour, a real-time complex controlled process. If we apply fuzzy controls theory to the constant pressure water supply system that has the better control effect to the whole system, and the control system performance will be more reliable and stable. But because the Inverter Technology and the fuzzy control technology are now the quite popular technology and it is developing now , specially combine Neural Networks with fuzzy control, will be the most effective intelligence control method. Therefore this system also needs thoroughly to study, unceasing improvement.