Power System Fault Diagnosis Considering Absence of Alarm Messages of Circuit Breakers on the Border of Outage Area
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摘要: 当电网中的元件发生故障,相关保护会跳开断路器以切断故障电流,最终形成一个或多个停电区域。如果将可疑故障元件限定在停电区域内,故障诊断程序的效率会得到很大的提升。然而在调度中心收到的跳闸断路器信息有缺失的情况下,由于无法形成停电区域,故障诊断程序只能对电网中所有元件逐一进行诊断,并且还容易造成对故障元件的漏判。针对断路器报警信息丢失的情况,从图论角度出发,以点割集算法为基础划分出多个可能包含故障元件的无源区域,然后通过skyline多目标优化查询方法,对这些无源区域按可疑元件查准率由高到低的顺序进行排列,并提供给故障诊断程序,保证了诊断速度的同时,能够防止故障元件的漏判。最后使用Petri网为诊断工具,以故障诊断算例验证了该方法的有效性。Abstract: When a fault takes place on a section in a power grid,the corresponding protective relays will trip the related circuit breakers to cut off the fault current.As a result,one or more outage areas would be formed.If the faulty section is restricted in the outage area,the efficiency of fault diagnosis program will be greatly promoted.On the other side,if the control center can not receive the whole alarm message of circuit beakers,all of the sections must be diagnosed because the outrage area can not be gotten.Furthermore,wrong diagnosis results may be gotten because of the missing of alarm messages.Given this back ground,based on graph theory,one or more outrage area can be partitioned by cut-set of nodes.Multi-objective optimization method skyline query was applied to sort the outrage area decreasingly based on the precision rate of fault section.The developed diagnosis method could make the diagnosis program much faster,and can insure the fault section will not be omitted.Petri net was applied as the diagnosis tool and several examples showed the accuracy of this method.
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