压水反应堆负荷跟踪的最优控制

按照最优控制理论 ,把压水反应堆的负荷跟踪控制问题描述为一个非线性二次型最优控制问题。反应堆芯部模型采用了一维分布参数模型。为求解这个最优控制问题 ,提出了一个行之有效的最优控制算法DDPSR。研究结果表明 ,DDPSR不仅能在大的优化区间收敛 ,而且迭代次数极少 ,速度相当快 ;大型压水堆能够以最优方式负荷跟踪运行 ,且轴向偏移 (AO)始终满足工程实际要求 ,此外还对硼的控制特性进行了特别的讨论     

Optimal Control Timing Search of Xenon Oscillations in Large PWRs Using a Characteristic Ellipse Trajectory Based on Three Axial Offsets

We have proposed a simplified control procedure for axial xenon oscillations in large PWRs based on a characteristic ellipse trajectory method. However, this procedure cannot guarantee that the desired control rod position can be achieved when the xenon oscillation is terminated. In a previous paper, we proposed an innovative and very simple procedure to generate the trajectory for the predicted oscillation behavior, which can be expressed by trigonometric functions multiplied by an exponential function. By using this prediction capability, it is shown that the optimal control timing can be easily determined to terminate the xenon oscillation at the desired control rod position. The optimal timing is obtained at the intersection or, cross point, of two predicted trajectories, the forward trajectory beginning from the current position and the backward trajectory that is generated based on the desired control rod position. Since the trajectories are calculated by simple trigonometric functions and an exponential function, the prediction takes only a few seconds using a PC.     

Using Poloidal Flux as Feedback Control Signal for Injected Power of LHCD in Long Pulse Discharge on HT-7 Tokamak

Long pulse discharge is one of the important goals of HT-7 superconducting tokamak experiments. For ITER （International Thermonuclear Experimental Reactor） or a tokamak reactor, carrying out a steady operation is one of the main techniques. For long pulse discharges on HT-7 the poloidal flux is used as the feedback signal to control the injected power of LHCD （Low Hybrid Current Drive） system. Experimental results are presented.     

New results and open problems in the theory of the Vlasov equation

The theory of existence and uniqueness of solutions of the Vlasov equation is not yet complete. We state two theorems about the local existence of strong solutions and about the global existence of weak solutions. Some questions, however, have yet to be answered. In particular this concerns global existence of strong solutions, uniqueness of and conservation of energy for weak solutions.     

Application of Linear Optimal Regulator Technique to Control of a Nuclear Reactor Plant

The synthesis technique using the deterministic optimal linear regulator with quadratic performance index is applied to a simplified nonlinear dynamics model of boiling water reactor with forced recirculation. The controller is first formulated on the basis of the currently used technique of the linear regulator applied to a linearized model of the plant; it is then modified by adding appropriate integration-type actions by trial-and- error to improve the controller performance.

The result of computer simulation suggests that, with simple modifications such as the addition of integration actions and the use of variable gain and reference, the linear regulator technique may be applied successfully to the control of a nuclear power plant for a change in power output without resorting to more sophisticated techniques.     

在束流输运网络中强流离子束的复杂性及其控制研究进展

讨论了在束流输运网络中强流离子束在国防与民用等许多方面极其重要的应用潜力和诱人的发展前景。指出在束流输运网络中强流离子束形成的束晕-混沌的复杂性已经成为强流离子束应用中的关键问题之一;必须深入研究这类束晕-混沌的复杂特性及其产生的物理机制,并实现对束晕-混沌的有效控制。考虑到这是一个特殊的复杂的时空混沌的控制问题,解决这一难题已经成为强流离子束涉及的高科技领域、非线性-复杂性科学及复杂网络交叉领域中极富挑战性的一个新课题。最后,对上述课题当前的最新进展进行了评论,指出了该课题今后的研究方向。     

水力驱动控制棒步进缸三维流场数值模拟

应用计算流体力学程序CFX5对水力驱动控制棒步进缸内部的三维流场进行了计算和分析。结果表明：步进缸内大部分区域流体流速较小,压力较高,且变化不大,发生明显变化的部位主要分布在步进缸底部水管入口及截面突变处、内外套对孔处和排气孔处。