Key Methods Of Control And Protection Strategy For High Intensity D-T Fusion Neutron Source

High intensity D-T fusion neutron source plays a momentous role in the nuclear energy researches, such as the Accelerator Driven Subcritical System (ADS), the International Thermonuclear Experimental Reactor (ITER) and the fourth generation nuclear power system. Operation safety is one of the key issues that should be paid attention to in the neutron source development.Reliable control and protection system provides a secure environment for the high intensity D-T fusion neutron source operation. By combining the advantage theories of multi-crossed disciplines and employing the advanced digital and intelligent methods, this dissertation presents a control and protection strategy methodology system, including safety control, safety interlock and fault diagnosis. The main researches are described as follows.(1) The multidimensional redundancy digital control strategy architecture has been proposed, and the quantitative modeling and analysis methods of the reliability parameters are developed as well. Distributed control technology is adopted in the control system on account of all the devices have diverse locations along the beamlines. A high-speed redundancy optical fiber ring network is constructed to accomplish network communication, and it can be able to complete the network reconfiguration within a few milliseconds when a communication failure occurs, and has no effect on the progress of logic control and data terminal. The mathematical model of the control network is established on the basis of network topology theory, by means of fault tree analysis method with the consideration of common failure and normal failure, the probability failure danger (PFD) and reliability models are derived according to system architecture, and the variations of the reliability parameters with working time are quantitative analyzed. The experimental results indicate that this control strategy highly improves the neutron source control system reliability.(2) The multi-degree of freedom and nonlinearity coupling method is proposed for the interlock logic design of complex system, and the distributed interlock computing architecture as well as its safety analysis method is established. The causes and effects in the neutron source safety interlock system are usually not formed as one-to-one mapping but the non-linear relationships based on multiple-objective and multi-parameter, every fault or failure may results in diverse interlock states. This interlock mechanism runs on the distributed interlock computing architecture through various programs and communication protocols. Markov model analysis method is adopted for safety parameters mathematical modeling of the interlock architecture. According to the variation trends of the internal states probabilities, system availability, probability failure safety and probability failure danger in the time domain, it turns out that this architecture effectually improves the interlock system safety.(3) Aiming at the multiple-input and multiple-output nonlinear characteristics of ions filter system on neutron source, an intelligent fault diagnosis system based on neural network is designed. In accordance with the generation mechanism of the ripples from high voltage power supply (HVPS), we obtain the distributions of different frequencies ripples on the HVPS components by power spectrum density, from which we could make more scientific decisions on the maintenance and improvement of the HVPS. To adjust and correct the beam track when passing through accelerating tube, a set of beam position diagnostic system and method based on the eight octants probes distribution is proposed. With the objective of eliminating the drawbacks and disadvantages caused by the time delay element in vacuum system, a gain adaptive compensation control strategy was proposed and the simulation results shows that the system self-regulation and anti-interference performances were greatly improved.Eventually, a series of theoretical and applied researches are developed on the basis of high intensity D-T fusion neutron generator (HINEG), which is constructed by Institute of Nuclear Energy Safety Technology, Chinese Academy of Sciences, and some critical problems are settled effectively.