A power decomposition method for monthly transaction plans of hydropower station groups considering grid section constraints

Abstract

The invention relates to a power decomposition method of monthly transaction plan of a hydropower station group considering the section constraint of a power grid, and belongs to the technical field of hydropower dispatching operation. The invention takes the minimum water consumption in the dispatching period as the goal, considers the control limit of the main transmission section of the power grid, and adopts a multidimensional search algorithm to quickly determine the power decomposition scheme of the monthly transaction plan of the hydropower station group. Firstly, the monthly transaction plan electricity of each power station is extracted, and the minimum water consumption model of the hydropower station group is constructed considering the limitation of the transmission section of the power grid; secondly, a multi-dimensional search algorithm is constructed from three dimensions of time, power station, and feasible region, and a check correction is introduced for the limit constraint of the power grid section The strategy is to relax first and perform optimization calculations, and check whether the output of each section violates the constraints according to the optimization results one by one. If it violates, the proportional reduction and load transfer strategies are used to ensure that the section safety constraints are met. The invention can effectively reduce the power generation water consumption of the system, and provides technical ideas for the execution of medium and long-term trading plans in the power market environment.

Description

technical field [0001] The invention belongs to the technical field of hydropower dispatching and operation, and in particular relates to a method for decomposing a monthly trading plan of a hydropower station group considering the constraints of a power grid section. Background technique [0002] The past decade or so has been a period of rapid development of my country's hydropower and power grid construction. The mainstream cascade hydropower stations in the Jinsha River, Lancang River, and Yalong River in the southwest have been put into operation in clusters, forming a batch of large-scale cascade hydropower stations with an installed capacity of over 10 million kilowatts. System, the national hydropower installed capacity has also rapidly increased from over 100 million kW in 2004 to 350 million kW in 2018, an increase of up to 2.5 times; Qiao DC, Niucong DC, Jinzhong DC and other UHV DC tie lines are used as links to realize the interconnected operation of large hydropo...

AI Technical Summary

Problems solved by technology

[0003] Under the interconnected operation platform, the grid-connected relationship of hydropower stations is very complicated. The upstream and downstream hydropower stations of a single river basin are merged into different transmission control sections (such as the Gongguo Bridge, Xiaowan, and Nuozhadu in the lower reaches of the main stream of the Lancang River are respectively merged into Jinzhong DC, Chusui, etc.). DC, Puqiao DC), there are also hydropower stations in different river basins merged into the same transmission control section (for example, Xiaowan and Jin'anqiao power stations are merged into Chusui DC at the same time). The power generation method and grid-connected scale, together with the power control conditions of the new power trading contract in the market environment, and the operation requirements and restrictions of the traditional hydropower reservoir itself, thus forming a hydroelectric power constraint set highly coupled in time and space, making the hydropower system Scheduling operation modeling and solving are facing great difficulties, and practical and effective models and methods are needed

Images