[en] The coordination control system and its design method for nuclear power device are given. At present, it is a advanced control system which have been accepted in other many industrial processes. DCS (Distributed Control System) with high, new technologies provides the coordination control system with prime hardware and software

[en] Based on the demand of producing energy in a fast reactor, the problem of maximum power output in a core is described as a optimal control problem, therefore, optimal neutron flux distribution can be obtained. During fuel cycle of the fast reactor fuelled UO₂-PuO₂, breeding ratio decreases in value when burnup increases, the decreasing in value concerns initial breeding ratio, hence, method of optimization is used for solving optimal initial breeding ratio. The obtained results provide useful materials for designing a fast reactor

[en] Highlights: • The equilibrium manifold and nonlinearity measure of the core are proposed. • The linear multi-model of the core is built based on the core nonlinearity measure. • A new state feedback control is used to design local controllers of the core. • Flexibility partitioning of model and control is presented for the nonlinear core. • The global stability of the core load follow control is analyzed. - Abstract: The purpose of this investigation is that a nonlinear Pressurized Water Reactor (PWR) core load following control system is designed and the global stability of the system is analyzed theoretically. On the basis of modeling a nonlinear PWR core and proposing the equilibrium manifold and the nonlinearity measure of the core to calculate the distribution situation of the core nonlinearity measure in the entire range of power level, linearized models of the core at five power levels are chosen as local models of the core and the set of local models is used to substitute the nonlinear core model. The full-state feedback control with a full-order observer is utilized to design a controller with robustness of every local model, which is treated as a local controller of the nonlinear core. The Kalman filter is contrived as an observer with robustness and the state feedback design with robustness is implemented via the robust pole assignment method. With the local models and local controllers, the flexibility partitioning of model and control is presented to design a decent flexibility controller of the nonlinear core at a random power level. A nonlinear core model and a flexibility controller at a random power level compose a core load following control subsystem. The combination of core load following control subsystems at all power levels is the core load following control system. Two global stability theorems are deduced to define that the core load following control system is globally asymptotically stable within the whole range of power level. Finally, the core load following control system is simulated and simulation results show that the control system is effective

[en] The power regulating system of research reactor is analyzed and the method of optimal transfer function in frequency domain is used for the design of optimal regulating system. Finally, the control system is realized by use of the part-state feedback. The results of simulation show that the performance of improved system has been ameliorated apparently for the design of the power regulating system of research type reactor and for the design of control system of PWR also

[en] The modes of PWR load following operation are surveyed and evaluated. A new mode--mode K and its control rod banks distribution in core, control rods moving procedure are analysed. The basic control principle of mode K is that a integral system is divided into subsystems and these subsystems are controlled respectively, therefore, the integral system which is difficulty to control realized automatic control

[en] According to the optimal control theory, the problem of load-following operation in a pressurized water reactor is formulated as a nonlinear-quadratic optimal control problem. One-dimensional core model is adopted. A successful optimization algorithm DDPSR is proposed to solving the obtained problem. The research results show that the DDPSR can converge with a long time interval and needs very small iteration number and computing time, and the practical reactor can be fairly operated in an optimal load-following manner and axial offset satisfies the required value from beginning to end. Control characters of boron concentration are discussed specially

[en] Xenon transient response of nuclear reactor during load-following is one of the important problems relating to economics and safety. Based on the characteristics of STM (System Tau Method which does not require iteration), it has high computing speed and high precision for solving linear optimization problems. While DDP (Differential Dynamic Programming) has high convergent speed in the neighborhood of optimal trajectory in solving nonlinear optimization problems, a practical method - - STM DDP is developed. STMDDP calculates nominal control by using STM at first, then approehes nonlinear optimal solution by using DDP. In comparison with the most commonly used methods, STMDDP can solve nonlinear optimization effectively and take considerably less computer times and iteration times with same precision. A numerical example shows that the conclusion obtained by STMDDP is useful to practical engineering problems

[en] In marine nuclear power plants (MNPP) which contain several reactors and turbines working in parallel, the power outputs of each turbine interfere with each other because of a common steam header that they are connected to causes the coupling effect among the turbine inlet flowrates. In order to avoid the mutual influence between the turbines, this paper presents a decoupling header outlet flowrate controlling method based on neural network inverse system (NNIS) composed of a static neural network with state feedbacks of the original multi-reactor and multi-load system. The existence of the inverse system for the header is proved by the reversibility derivation of interactor algorithm. The simulation results indicate that the proposed decoupling controller has excellent decoupling performance, which can turn the multivariable system into a number of single input and single output systems, and eliminate the mutual influence. Furthermore, it has a faster tracking capability than conventional PID controller which can improve the safe and stable operation of the multi-reactor and multi-load system. (author)

[en] The developments of fuzzy logic control theory promote the application of fuzzy logic controller to load-follow in Pressurized Water Reactors. A control law combined fuzzy logic controller to load-follow in Pressurized Water Reactors. A control law combined fuzzy logic controller with conventional PID controller, using the strategy of output gains varying with nuclear reactor power, was proposed to control load-follow operations in PWR. This method solves the nonlinear time-varying close-loop control problem and overcomes the shortcomings and limitations of the model-based method. The simulation results show the method is of both satisfactory dynamic performance and high steady state precision. This approach will improve the automaticity of load-follow operations

[en] The main objective of this study is to design a robust pressure control system for a once through steam generator (OTSG) to achieve stable pressure operation under conditions of external disturbances and model uncertainties. For this purpose, the transfer function model of the OTSG in preheating section, evaporation section and superheat section are derived from a nonlinear model based on the energy conservation equations and the mass conservation equations. The OTSG pressure controller from transfer function models is designed using an H_∞ mixed sensitivity method to minimize the pressure disturbance under various uncertainties. The performance of the robust pressure system is assessed against 10% of pressure step increase transients with the steam flow disturbances at different operation time. The simulation results show that the robust control system could maintain satisfactory control performance and good robustness of the OTSG under external disturbances and internal model uncertainties, indicating the effective of the control design. (author)