Nuclear Reactor Power Control Based On A New Type Control Rod Driving Mechanism

Nuclear power plant safe and reliable operation is the important guarantee for the development of nuclear power.In order to ensure the core safety during the reactor normal operation,the power control system of the reactor plays a vital role.Therefore,it is a hot area in the research of nuclear energy to study a more safe and stable power control system of pressurized water reactor.Control rod driving mechanism?CRDM?,as the momentous mechanical equipment in the nuclear reactor,is the component of reactor and system protection,which takes on the mission of the start-up,power regulation and shutdown of reactor.The power control problem of nuclear reactor is investigated in this paper based on new type servo piston hydraulic CRDM.First,the angular velocity model is established for the stepper motor,and then the mathematical modeling of the reactivity of the control rod is carried out.The dynamic equation of point reactor model is introduced,and the two mathematical models are combined into the linear parameter varying state space model,and the stability,observability and controllability of the model are analyzed.In order to run the reactor safely,the reactor power control system must be an internal stable system,the LMI toolbox in MATLAB is used to solve the feasible solution of linear matrix inequalities?LMIs?,and design two guaranteed cost state feedback controllers and one guaranteed cost state feedback tracking controller for the system.Through the simulation results,the stability of the control system and the effect of different weight matrices on the control effect of the control system are discussed.In order to ensure the intrinsic safety of the reactor,which means the reactor can quickly restore the balance with disturbances,three robust controllers based on H₂,H_?and H₂/H_?performance indexes are designed.The global controller and the piecewise controller based on state feedback are designed based on the performance index of H₂ and H_?,and the output feedback controller is also designed based on the H_?performance index.by solving the LMIs.The dynamic performance of the system in the face of different disturbances is analyzed by simulation either.At last,in order to achieve the load tracking of the reactor power control system,two state feedback tracking controllers are designed on the basis of the performance index of H₂,H_?and H₂/H_?.The simulation is carried out under four conditions and different disturbances and with the simulation results,the dynamic performance of the system under different conditions is analyzed.Simulation results show that the controller designed in this paper can ensure the stability of the closed-loop system.