Evaluation of Voltage Sag Severity in Provincial Power Grid

In view of the problem that it is impossible to deploy voltage sag monitoring devices in the whole network, resulting in the lack of basis for industrial users to enter the network, a scheme for evaluating the severity of voltage sag at the grid side in the provincial power grid is proposed. Firstly, by analyzing the characteristics of voltage sag transmission, the simulation scope of provincial power grid is determined, and the differences of fault rate and fault type proportion of different voltage grades highlighted due to the expansion of simulation scope are considered, which makes the short circuit fault simulation model based on Monte Carlo method closer to reality. Secondly, from the engineering point of view, improve the BPA data maintained by the power grid dispatching department, call the BPA parallel simulation calculation through the development interface, and analyze the calculation results to obtain the grid side voltage sag severity evaluation index.