Failure analysis of dual redundant controllers and designs for high reliability

ZHOU Shuqiao; LI Duo

doi:10.16511/j.cnki.qhdxxb.2017.25.011

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Journal of Tsinghua University(Science and Technology) ›› 2017, Vol. 57 ›› Issue (4) : 399-404. DOI: 10.16511/j.cnki.qhdxxb.2017.25.011

NUCLEAR ENERGY AND NEW ENERGY

Failure analysis of dual redundant controllers and designs for high reliability

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Abstract

Redundant controllers are widely used in control systems of nuclear-powered facilities requiring high reliability. The reliability of dual-redundant controllers is improved by analyzing the controllers' possible working states in a state transition diagram. The two critical circumstances where the reliability is impaired are failures caused by dual-master collisions and the loss of redundancy resulting from the failure of a stand-by unit. To avoid these critical circumstances, this paper presents a redundant controller scheme with dual dedicated communication paths using heartbeat double checking and slave reporting. A Markov-chain model was developed to evaluate the reliability of redundant controllers and the effectiveness of this scheme. The results show that this redundant controller design significantly improves the reliability with a three orders of magnitude reduction of the failure rate.

Key words

redundant controllers / dual-master collision / failure rate / reliability

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ZHOU Shuqiao, LI Duo. Failure analysis of dual redundant controllers and designs for high reliability[J]. Journal of Tsinghua University(Science and Technology). 2017, 57(4): 399-404 https://doi.org/10.16511/j.cnki.qhdxxb.2017.25.011

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