Power system source-load-storage coordinated rolling scheduling method based on flexibility margin

Abstract

The invention provides a power system source-load-storage coordinated rolling scheduling method based on flexibility margin, and relates to the field of power generation scheduling of power systems. The method comprises the following steps: firstly, determining an uncertain interval of wind power output and load, and establishing a flexible supply capacity model corresponding to each flexible resource; on the basis, respectively establishing a power system flexibility demand capacity model and a flexibility supply capacity model, and determining a flexibility margin index; then establishing asource load storage day-ahead coordination scheduling model and solving; and in each rolling period in the day, establishing and solving a source load storage intra-day rolling scheduling model of therolling period, and finally obtaining a scheduling result of each intra-day rolling period. Flexible resources such as a wind turbine generator, a thermal power generating unit, a gas-electric unit,a pumped storage unit and an interruptible load are taken into consideration, actual engineering can be effectively met through the scheduling plan formulated by the invention, and the operation economy and reliability of a power system are optimized.

Description

technical field [0001] The invention relates to the field of power system generation scheduling, in particular to a rolling scheduling method for power system source-load-storage coordination based on flexibility margin. Background technique [0002] China's new energy power generation has developed rapidly and has become the second largest power source in China, with the world's largest installed capacity. A new energy power system dominated by new energy has gradually formed. The increase in the penetration rate of new energy poses a severe challenge to the flexibility of the power system, and its volatility and uncertainty increase the difficulty of power grid operation and scheduling. If the flexibility of the power system is insufficient, it is difficult for power generation to follow the change of net load, and wind curtailment and load shedding operations are required, which will cause a huge waste of power resources. How to ensure sufficient flexibility of the power...

AI Technical Summary

Problems solved by technology

[0004] However, in the existing coordinated scheduling methods, most of the new energy output is used as a fixed value, and the deterministic method is used to model, and the net load value is used to participate in optimal scheduling. More stringent requirements are put forward; secondly, the time characteristics of flexible resources are not considered, and the analysis is simply performed on one time scale, without considering the relationship between different time scales; in addition, many studies have not considered flexible resources comprehensively, and have not tapped power The potential of system flexibility, thinking that flexibility only exists on the power supply side, while not considering the impact of various flexible resource characteristics on power grid operation scheduling

Images