基于Markov模型的高压输电线继电保护装置风险评估

发布时间：2018-07-12 19:18

本文选题：继电保护装置 + 风险评估　；参考：《电网技术》2014年07期

【摘要】：评估运行中的继电保护装置可能引起的后果,是继电保护评估的一个重要问题。结合线路状态和保护装置失效机理,提出了高压输电线继电保护装置风险评估方法。首先,给出输电线与保护的10种状态;进一步,根据保护的自检特性,归纳获得了由保护装置引发的4种风险,即显性误动风险、显性拒动风险、隐性误动风险和隐性拒动风险。然后,根据输电线路和保护装置的状态划分,建立10状态Markov模型,并利用Markov模型给出上述4种风险指标计算方法;最后,基于某电网实测数据,对比了风险与传统可靠性指标在评价可靠性上的差异,分析了自检率对风险的影响。分析表明,风险与不可用率随定检周期变化差异明显,降低失效率或增大自检率能有效地降低系统风险与不可用率。
[Abstract]:It is an important problem to evaluate the possible consequences of relay protection devices in operation. Combined with the line state and the failure mechanism of the protective device, the risk assessment method of the relay protection device for the high voltage transmission line is proposed. First of all, 10 states of transmission line and protection are given. Furthermore, according to the self-checking characteristics of protection, four kinds of risks caused by protection device are summarized, namely, overt misoperation risk and dominant rejection risk. Implicit misoperation risk and implicit rejection risk. Then, according to the state division of transmission lines and protection devices, a 10-state Markov model is established, and the above four risk index calculation methods are given by using Markov model. The difference between risk and traditional reliability index in evaluating reliability is compared, and the influence of self-test rate on risk is analyzed. The analysis shows that the difference between the risk and the unavailability rate with the fixed inspection period is obvious, and reducing the failure rate or increasing the self-test rate can effectively reduce the system risk and the unavailability rate.
【作者单位】：新能源电力系统国家重点实验室(华北电力大学);南方电网超高压局输变电公司广州局;
【基金】：国家863高技术基金项目(2012AA050208) 国家自然科学基金资助项目(51222703) 教育部中央高校基本科研业务费专项资金资助(12MS30)~~
【分类号】：TM774

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