双余度核电DEH设计与马尔科夫模型分析

Design and Markov model analysis of dual redundancy nuclear power DEH

摘要:

可靠性在核电汽轮机数字电液控制系统（Digital electro-hydraulic control system，简称DEH）质量中至关重要。从提升系统可靠性的角度出发，分析了核电DEH的工作原理，设计了基于异构处理器的核电DEH系统，给出了DEH的系统架构、硬件构成及双余度设计方案。基于马尔科夫过程理论建立了双余度核电DEH的可靠度函数模型, 结合可靠性框图及双余度系统状态转移图对核电DEH做了失效分类；引入失效率、维修率、共因失效因子与诊断覆盖率等参数，建立了状态转移方程，分析了系统在不同生命周期基于马尔科夫模型的可靠度。通过一个实例检验了双余度核电DEH的可靠性，为工程设计人员提供了指导与参考。

Abstract:

Reliability is very important in the quality of the digital electro-hydraulic control system (DEH) for nuclear power steam turbines. From the perspective of improving system reliability, the working principle of nuclear power DEH was analyzed. And a nuclear power DEH system based on heterogeneous processors was designed, and the system architecture, hardware composition and dual redundancy design scheme of DEH were given. Based on Markov process theory, the reliability function model of dual redundancy nuclear power DEH was established, and the failure classification of nuclear power DEH was combined with the reliability block diagram and dual redundancy system state transition diagram. The state transfer equation was established by introducing the parameters such as failure rate, maintenance rate, common cause failure factor and diagnosis coverage rate, and the reliability of the system based on Markov model in different life cycles was analyzed. The reliability of double redundancy nuclear DEH is tested by an example, which provides guidance and reference for engineering designers.