考虑隐性故障的继电保护系统可靠性分析及评估

为了更好地评估继电保护系统的可靠性,搭建了考虑隐性故障和系统运行状态变化时单一保护系统的可靠性模型。而后基于所搭建的可靠性模型,计算得到了随潮流变化时隐性故障率的变化情况和隐性故障修复率对继电保护系统正常运行的影响,并给出了基于概率模型的方法对超高压线路继电保护系统的可靠性进行评估。基于概率模型的方法是对马尔可夫状态空间模型方法的一种简化,适合工程应用,为完善继电保护系统的可靠性评估提供了可行的数学方法。算例验证了所提方法的正确性。

Assessment of the reliability of protection system considering hidden failure

In order to better assess the reliability of protection system, this paper builds the Markov model of single protection system considering hidden failure and changes of operating condition. Then based on the model, the changes of hidden failure rate affected by power flow and the effect of hidden failure repair rate on the normal operation of protection devices can be acquired. We also put forward probabilistic model for the reliability assessment of UHV protection system, which is suitable for engineering applications. Probabilistic model is a simplification of Markov state-space model and provides a mathematical way for improving the protection system reliability assessment. The results verify the validity of the algorithm.