Research on Key Technologies of dynamic risk assessment in whole process of mega city power grid

In view of the large number of equipment, complex random factors affecting the risk, and the coupling effect of different equipment combination faults on power grid, it is very difficult to conduct online risk assessment of power grid operation. The challenges and opportunities faced by the whole process dynamic risk assessment of power grid in super large cities are pointed out. This paper first introduces the concept of power grid dynamic risk assessment and the main problems of current risk assessment. Secondly, the risk assessment methods such as state duration sampling method, entropy weight method and risk scenario screening based on fault influence scope are analyzed, and the overall design scheme of urban power grid operation risk assessment system is proposed. Finally, on the basis of the above theoretical research, combined with the engineering application requirements, the design and development of relevant software module program is completed, and the correctness of the software design and theoretical method is verified by an example.