Failure analysis of dual redundant controllers and designs for high reliability

doi:10.16511/j.cnki.qhdxxb.2017.25.011

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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.

Keywords redundant controllers dual-master collision failure rate reliability

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Issue Date: 15 April 2017

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	ZHOU Shuqiao
	LI Duo

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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.

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http://jst.tsinghuajournals.com/EN/10.16511/j.cnki.qhdxxb.2017.25.011 OR http://jst.tsinghuajournals.com/EN/Y2017/V57/I4/399

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