Multi-target economic dispatch method for power system with wind farm

Abstract

The invention provides a multi-target economic dispatch method for a power system with a wind farm. The method comprises the steps that first, possible wind power output scenes in a dispatch cycle are generated, and the number of the scenes is reduced to S; second, a mathematical model of the method is built, target functions include total electricity generation cost, power balance levels of all the moments of all the scenes and spinning reserve levels of all the moments of all the scenes, and constraint conditions include output upper limit and output lower limit constraints of thermal power units, climbing rate constraints and the minimum start and shut down time constraints; third, fuzzification processing is carried out by building membership functions of all the target functions; fourth, the minimum values of all the membership functions are obtained to serve as global satisfaction degree indexes; fifth, an economic dispatch result meeting the constraint conditions in the second step and enabling the global satisfaction degree indexes in the fourth step to be maximum is solved. The economic dispatch method is suitable for solving the problems about economic dispatch of the power system with the wind farm and the thermal power units, and a plurality of optimization targets are balanced in a dispatch result.

Description

technical field [0001] The invention relates to the technical field of power system scheduling automation, in particular to a multi-objective economic scheduling method for a power system including a wind farm. Background technique [0002] Due to the fluctuating and intermittent characteristics of wind power, the large-scale grid connection of wind power has brought great challenges to the economic dispatch of power systems. The problem of economic dispatch including wind farms mainly involves thermal power units and wind farms. Since the existing technology is difficult to accurately predict the output of wind farms, it is necessary to ensure that the dispatch results can well cope with various wind power fluctuations in the dispatch period when performing economic dispatch. The output is possible, and at the same time, it is guaranteed that the dispatching result has good economy. [0003] Fuzzy modeling method is one of the important methods to solve this problem. The b...

AI Technical Summary

Problems solved by technology

However, when the scene is reduced, the accuracy of the scheduling results will decrease, and the reduced scene can only represent the typical output in the scheduling cycle, and cannot fully simulate various possible output situations.

Images