核安全级DCS通信网络残差率设计研究--控制网



核安全级DCS通信网络残差率设计研究
企业:北京广利核系统工程有限公司 日期:2020-09-12
领域:DCS 点击数:157

北京广利核系统工程有限公司 李明利,李刚,张杰

摘要:核电厂系统是核电厂的神经中枢,是核电厂安全、可靠、稳定运行的重要保障,其中核安全级DCS承担着重要的保护功能,数字化核安全级DCS以其高可靠、高诊断等特点已经成为技术发展趋势。数字化技术以CPU/FPGA及通信技术为特征。核安全级DCS通信网络的设计是一个关键问题。目前IEEE 7-4.3.2等标准中对通信的总体要求包括独立性、确定性及总体可靠性等要求,IEC 61784-3中提出了对通信残差率的要求。本文结合应用于数字化核安全级DCS的和睦系统的通信设计经验,总结了通信系统可靠性的影响因素,并提出了高可靠性的通信系统的设计方法,通过该方法的应用,和睦系统的通信残差率进一步降低,满足了SIL3的要求。本方法作为一种实现安全要求的有益实践,可以推广到武器装备等军用领域。

关键词:核安全级DCS;通信残差率;和睦系统

Abstract: A nuclear digital control system (DCS) function as neuralcenters in the nuclear power plant, which is an important guaranteefor safe, reliable and stable operation. Nuclear safety level DCS playsan important role in protection. The digital safety DCS has become atechnology development trend with its high reliability and advanceddiagnostics. Digital technology is characterized by CPU / FPGA and communication technology. The communication network design ofnuclear safety DCS is a critical issue. Standard IEEE 7-4.3.2 gives thegeneral requirements of communication including independence,determinacy, and reliability, etc. Standard IEC61784-3 introduces residual error probability as the requirement of communication. In this paper, combined with the communication network development experience of FirmSys and requirements from IEC standards, we summarize the influencing factors of communication reliability, and put forward the design method to develop communication network with high reliability level. Through the application of the method, the residual error probability of FirmSys communication system is further reduced to meet the requirements of SIL3. As a useful practice to realize the safety requirements, the design method can be a reference for communication design in military industries.

Key words: Nuclear safety DCS; Residual error probability; FirmSys

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摘自《自动化博览》2020年9月刊

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