Research Of Maintenance Decision-making For Power Transmission System Equipment Considering The Fluctuation Of Risk

Equipment maintenance decision-making is one of the most critical problem during the power grid operation,suitable maintenance can bring huge benefits for power grid and improve the efficiency of the power grid operation,on the contrary,it will affect the reliability and economic of power grid operation.With the development of measurement,communication,computer and other technology,condition-based maintenance get much more promotion and application which is based on condition monitoring of power grid equipments.At the same time,as an important part of the strong smart grid construction and full-life asset management,condition-based maintenance has become the key research point of electric power enterprise.Condition-based maintenance.estimate the deteriorating condition of power grid equipments by monitoring the trend of condition parameters,and perform maintenance after obvious degradation.Compared to preventive maintenance,condition-based maintenance can not only extend the economic life of power gridequipments,but 'also 'guarantee.the reliability of power grid operation,it has greatly improved the reliability and economy of the maintenance.Considering the fluctuation of the power grid risk,a maintenance decision model based on minimum cumulative risk algorithm was proposed.At first taking minimum variance of risk in all maintenance time intervals as objective function,a power grid maintenance scheduling model was built.Then the decision sequence of awaiting maintenance equipments can be obtained by ranging their contribution to the whole power grid risk from large to small,which were calculated based on the risk tracing method.After all mentioned above,a heuristic solution based on minimum cumulative risk algorithm for the built model was proposed to obtain every awaiting maintenance equipment's maintenance time successively.At last,a numerical example which include five awaiting maintenance equipments was used to illustrate the proposed maintenance decision model,and the results demonstrate that model can effectively realize the balance of network risk as well as minimizing the network risk of whole maintenance cycle to some extent.