| When the Winter Olympic Games will be held in Beijing in February 2022,the reliable operation of the city’s power grid system is crucial.Once the power grid failure occurs,it can lead to performance interruption or competition mistakes,or even large-scale power outages in the competition area,resulting in casualties and chaos of the event.Therefore,it is of great significance to carry out risk assessment for the safety control of urban power grid.Traditional risk assessment of power grid is mainly aimed at local power accidents,which is not suitable for high quality assessment of large power grid as a whole.In view of this situation,this paper takes the city power grid of the Winter Olympic Games as the research object,and puts forward a more suitable risk assessment method of the power grid.This paper first investigates and analyzes the big power failure during the major sports events at home and abroad.Based on the characteristics of Chinese power grid,it summarizes the defects of traditional evaluation methods,which makes clear the necessity of risk assessment of power grid for Winter Olympic Games.Introduces the basic situation,the Olympics region and according to the research of grid system,from the power supply network,equipment,transmission and distribution,dispatching and risk source recognition of secondary side direction of electricity side and transmission side and distribution side and technical side and side five major risk source,and refine a 35 species of risk source to establish Olympic city network risk evaluation index system.Then in view of the shortcomings of the traditional weight calculation method,the intuitionistic fuzzy analytic hierarchy process(IFAHP),which is obtained by improving the AHP through intuitionistic fuzzy set,is selected to calculate the subjective weight from the three dimensions of membership degree,ambiguity degree and hesitancy degree.IFAHP is compared with AHP from various angles and the conclusion that IFAHP has stronger applicability is drawn.The failure of each risk index in the past five years was counted,and the objective weight was obtained by entropy weight method.The final index weight was obtained by combining the subjective and objective weights with the combined weighting method based on game theory.Then the risk assessment samples are determined by using expert scores.In order to avoid the problem that the score is not objective enough due to the different experience of experts ignored in the scoring method,a Fuzzy AHP method which combines triangular Fuzzy number into analytic hierarchy process(AHP)is proposed,and the comprehensive analysis is carried out from the three perspectives of educational background,professional title and working years.Finally,for the first time,the author applies the grey cloud model,which is a combination of grey clustering whitening weight function and cloud model,in the risk assessment of power grid,and proposes a risk assessment method of urban power grid based on grey cloud model for the Winter Olympic Games.Firstly,aiming at the problem that the traditional grey clustering whitening weight coefficient can only reflect the information uncertainty,but ignore the randomness and fuzziness,the grey cloud model is constructed by combining the grey clustering whitening weight with the cloud model which can reflect the randomness and fuzziness.The grey cloud model is applied to the risk assessment of the Winter Olympic city power grid,and the overall risk level of the Winter Olympic city power grid is obtained,which is consistent with the actual situation,and proves the applicability of the grey cloud model in the overall assessment of the power grid.Finally,according to the evaluation results,the risk management and control suggestions are put forward for the important places involved in the Winter Olympic Games in terms of equipment reliability,personnel emergency response ability,accident handling and risk pre-control.Figure [19] Table[43] Reference [83]... |
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