大型压水堆机械补偿控制策略仿真研究

机械补偿（MSHIM）运行的优点之一是实现了堆芯功率和轴向功率偏移（AO）在控制手段方面的部分解耦，但原始控制策略设计并未充分利用该优点。本研究通过理论分析提出了一种新的改进型MSHIM控制策略，同时基于节点反应堆模型开发了MSHIM控制系统仿真平台，并利用该平台对西屋公司原始控制策略、西屋公司Drudy的改进控制策略和本研究提出的改进控制策略进行仿真研究和比对。结果表明，本研究提出的改进型MSHIM控制策略能够显著地提高AO的控制精度，并能减少控制棒的移动，明显地改善了AP1000核电机组的运行效果，可在工程中参考使用。 

Simulation Study of Mechanical Shim Control Strategy for Large Pressurized Water Reactor

One of the advantages of Mechanical Shim?(MSHIM) operation technology is that it can realize partial decoupling between core power and axial offset?(AO) in terms of control means. However, the original control strategy design does not make full use of this advantage. A new improved MSHIM control strategy is proposed through theoretical analysis in this paper. At the same time, a simulation platform for MSHIM control system is developed based on the multiple node reactor models. Upon this platform, the original control strategy of Westinghouse, Drudy’s control strategy of Westinghouse and the improved control strategy proposed in this paper are all simulated and compared carefully. The analysis results show that the improved MSHIM control strategy proposed in this paper not only can provide much tighter axial offset?control but also can reduce the control rod movement,?indicating its superiority than the original operation strategy. The study can be used as a reference for engineering implementation.