基于双层不确定推理的保护运行评价方法研究

Research on a Method of Protection Operation Evaluation Based on Double-Layer Uncertainty Reasoning

针对地区电网继电保护装置的动作行为分析问题,建立了继电保护装置运行原因分析和责任部门评价两大规则体系.采用权值法形成的可信度赋予规则体系的概率模型,结合双层推理方式,形成双层不确定推理的过程,有效地反映了系统运行方式与保护逻辑动态过程的结合;采用基于概率模型的不确定推理方式实现责任部门评价过程,以提高评价过程的可靠性.现场试用过程表明:采用该方法评价继电保护装置的实际运行情况的结果正确,具有很好的实用价值.

For the problem of the relay protection device behavior analysis in the regional power grid,two rules of operation reason analysis of relay protection device and the responsibility department evaluation were built.Probability model of credibility given rules by weighting method was used to form a double uncertain reasoning process,which combined with double-layer reasoning.The combination of the system operation mode and the protection logic and dynamic process was effectively reflected.Uncertainty reasoning based on the probability model was used to evaluate the responsibility department,to improve the reliability of the evaluation process.The trial process shows that it is correct to evaluate the practical operation of relay protection device,and it has highly practicability.