Quantitative evaluation for influence factors of calculation deviations of schedule power flow for large power grid

With the increase of the scale of the power grid and the improvement of the intelligence degree, the rationality and accuracy of the schedule power flow (the schedule) are becoming more and more serious. In this paper, by analyzing the relationship between input and output in the process of power flow calculation, the five main factors influencing the line active power deviation and the main cause of node voltage deviation are obtained. Furthermore, the influence of these factors on the line active power and node voltage are analyzed and the corresponding contribution indexes are calculated with the flexible use of sensitivity analysis and power flow distribution factors. The analysis and synthesis of these indexes lead to a set of methods for quantitative evaluation of the schedule, which can realize the rapid evaluation of the calculation precision. The rationality and practicability of this method are verified by the sample application, based on the schedule data from Central China State Grid.