| CFETR (China Fusion Engineering Test Reactor) is in the conceptual design phase currently. The components and environments in vacuum vessel of CFETR will suffer from radioactive contamination and be activated in fusion reaction. So the remote handling (RH) maintenance of the critical components becomes the unique way for CFETR maintenance. Electro-hydraulic servo system, combining the technical features of both electrics and hydraulics, is very suitable to the blanket RH control system. After the operation of CFETR, the vacuum vessel will be in the complex environment of high temperature and strong radiation. In addition, the high-temperature baking is very essential for attaining the specified vacuum better. Therefore the high-precision temperature control problem has become one of the key technologies of CFETR design. This article focuses on researching the fuzzy PID algorithm and its application on two aspects of high-precision electro-hydraulic servo control and temperature control. It has a very important significance and application value for the design of CFETR blanket RH control system.Based on the technical design requirements of CFETR blanket remote handling maintenance, this paper focuses on the control method of achieving high synchronization accuracy of electro-hydraulic servo system. Based on fuzzy control theory and practical experience, a fuzzy adaptive proportional-derivative (PD) controller was designed. Then a more precise co-simulation model was established with AMESim/Simulink. It attained an accurate simulation result.Through the analysis of simulation results, it is proved that the fuzzy adaptive PD control is faster and more precise than classical PD control without disturbances. Fuzzy adaptive PD control strategy is superior to the other two control strategies. Under the condition of1000N and2000N step disturbances, fuzzy adaptive PD control is more stable than classical PD control. Fuzzy adaptive PD control has a stronger capacity of resisting disturbance than classical PD control, and its robustness is better. Thus the fuzzy adaptive PD control algorithm is designed as the core strategy of electro-hydraulic servo control system.Based on the temperature control requirements of CFETR, this paper also focuses on how to achieve high accuracy of temperature control. The temperature control system is a complex control system with the nonlinear characteristics of great inertia, pure lag and time varying. It is difficult to establish a precise mathematical model. Thus it is difficult to achieve satisfied control effect through the classical PID control. The hybrid control algorithm is accompanied with advantages of both fuzzy and PID control algorithm and can achieve a better control effect. Thus a hybrid of fuzzy and PID control method was proposed and a hybrid controller was designed.According to the conditions that exist, a temperature testing experiment was built. Through the analysis of the experimental results, it is proved that the hybrid of fuzzy PID controller designed has a smaller overshoot, faster response and greater accuracy compared to individual PID controller and fuzzy controller. Besides, this superiority is more obvious with the increase of the set point. Hence, the hybrid of fuzzy and PID control algorithm is designed as the core strategy of the temperature control system. |
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