| Reactor power control system is the most important part of the control system in nuclear power plant, which related to the safety and reliable operation of the entire nuclear power plant. It’s of great significance to design appropriate power control systems to ensure the safety and economy of nuclear power plant. The operation of reactor power is non-liner and complex, which has great requirements on the control system. In the process of tracking power load, conventional control methods cannot fully meet the requirements of power control, because the change of reactor power has a large range and the adjustment process is complicated. The fuzzy control agrees well with the nonlinear systems. Considering the non-linear characteristics of the system in reactor power, the adhibition of fuzzy control in the control process of reactor power was researched.The single group delayed neutron kinetics formula which considered the influence of the temperature effect of reactivity was dealt as study control object. The model for designing controller was obtained through normalization and linearization. PID controller, Mamdani fuzzy controller and T-S fuzzy controller were designed for nuclear reactor power control. The control performance was verified in the conditions of full power operation, low power operation and emergency operation.The simulation result shows that, the PID controller could realized the control of reactor power in the case of full power operation and failed in low power operation and emergency operation. In each case, both Mamdani fuzzy controller and T-S fuzzy controller could control the reactor power well. The nonlinear following control was realized. In the case of full power operation, Mamdani fuzzy controller and T-S fuzzy controller had a better performance than the PID controller. In the case of emergency operation, the T-S fuzzy controller was better than the designed Mamdani fuzzy controller in the process of nuclear reactor power following control. |
