Of Carr Hot Water Layer System Heating Device Control Algorithm And Simulation

China Advanced Research Reactor (CARR), a light water cooled, heavywater moderated, inverse neutron trap reactor, is being constructed in ChinaInstitute of Atomic Energy in 21st Century. High flux neutron can be educedfrom the core, so CARR can meet the need of preceding basic research, e.g.neutron scattering experiment, and the need of the nuclear industry, nationaldefense, and Country economy. The main technical indexes of CARR can attainthe advanced level in the world.CARR Hot Water Layer System (HWLS) is to set a layer of hot water at thetop of reactor pool. The temperature of the upper part of the reactor pool is alittle higher than the lower one. It can limit the lower water containingradioactive material to the surface of the pool by convection, to drop down theradiation level of the reactor hall.It is very important for forming, maintaining and keeping the shieldingeffect of HWLS, to regulate the power of heaters. Such factors as disturbingfactors of HWLS are complex, equipment of execution is non-linearity andcontrolled object is inertia make it more difficult to regulate the power of heaters.By comprehensive theoretic analysis and simulation study, we learn the influenceof parts' characteristic on system, get the appropriate control methods andacquire the theoretic guidance and basis for the system design.The following research works are carried out in this paper:1. Under the designed circumstances, combined with the operatingdemands of CARR HWLS, the control requirements aredetermined.2. Basing on the analysis of the thermal model of HWLS, the controlmodel of HWLS is established. We also study the principle ofcontrol parts and establish the corresponding control model.3. Basing on the simulation flat in Matlab-Simulink, simulation models of parts of closed loop system are founded and actualcharacteristic of these parts is described in these models.4. Theories of traditional PID control are applied to analyze thestability of the closed loop system and the stable boundary of themain control parameter is attained by analysis, e.g. the proportionalcoefficient of the controller.5. Basing on theories of traditional PID control, method of traditionalPID is in research in theory systematically and deeply in this thesis.The main control parameter is optimized by the simulated results,the traditional PID power controller of CARR HWLS heaters isdesigned and the control effects are analyzed and studied accordingto the simulated results.6. Basing on theories of fuzzy control, intelligent control methods arealso studied in theory systematically and deeply in this article.Combined with expert experience and simulated experimental data,the membership functions are given out, fuzzy control rules arewritten and the proportional transform factors are determined. Thefuzzy power controller of CARR HWLS heaters is designed byFUZZY tool box, analyzed and simulated by MATLAB.From the simulated results, we can see clearly that both the traditional PIDpower controller and the fuzzy power controller which have been describedabove in the article are available for this control system, each has its own goodqualities:The fuzzy power controller of CARR HWLS heaters has had the bettercontrol effects and brought the good characteristics of stability, high-speed,etc.The traditional PID power controller of CARR HWLS heaters has suchcharacteristics as simple principle, convenience for using, etc, which makes itmore available for engineering.