基于风险和检修收益的继电保护设备检修决策方法

针对如何合理制订继电保护设备检修策略的问题,提出基于风险和检修收益的继电保护检修决策方法,从检修顺序和检修等级方面对保护设备实现差异化维修.首先采用一次、二次系统综合风险评估模型,以基于保护状态评价得到的实际故障率为风险发生可能性,保护设备故障对一次系统运行的影响作为风险后果,计算出风险值作为确定检修顺序的依据.然后分析了不同检修方式下的检修成本和对继保设备故障率的影响,利用检修风险收益模型确定了保护设备的检修方式.使检修决策不仅保证设备的可靠性,还在一定程度上兼顾检修的经济性.最后利用IEEE 9节点系统进行了仿真计算,结果证明了所提方法的合理性.

Maintenance Decision-Making Method for Protective Devices Based on Risk and Maintenance Benefit

Aiming at properly formulating maintenance strategy of protective equipment, this paper proposes a maintenance decision-making method based on risk and maintenance benefit, which can be used for realizing differential maintenance of protective equipment in terms of maintenance sequence and levels. Firstly, risk assessment model integrating both primary and secondary systems is employed to obtain risk values as the basis for deciding the maintenance sequence. Actual failure rate based on condition-based evaluation of protective devices is taken as the probability of risk occurrence, and the impact of protective equipment failure on the operation of primary systems is taken as the failure consequence. Then, maintenance cost and its impact on the failure rate of protective devices under different maintenance levels are analyzed. The maintenance risk benefit model is used to determine maintenance levels of protective equipment, which not only ensures the reliability of protection systems, but also considers the maintenance economics. Finally, simulation study is carried out based on IEEE9 bus system. The results verify the rationality of the proposed decision-making method.