Hydropower station group monthly transaction plan electric quantity decomposition method considering power grid section constraints

Abstract

The invention relates to a hydropower station group monthly transaction plan electric quantity decomposition method considering power grid section constraints, and belongs to the technical field of hydropower dispatching operation. According to the method, the monthly transaction plan electric quantity decomposition scheme of the hydropower station group can be quickly determined by adopting the multi-dimensional search algorithm by taking minimum water consumption in the scheduling period as a target and considering the main transmission section control limit of the power grid. Firstly, monthly transaction plan electric quantity of each power station is extracted, and a hydropower station group water consumption minimum model considering power grid transmission section limitation is constructed; secondly, a multi-dimensional search algorithm is constructed from three dimensions of time, a power station and a feasible region, a check correction strategy is introduced for power grid section limit constraints, namely, loosening is performed, and then optimization calculation is performed, whether the output of each section violates the constraints one by one according to an optimization result is checked, and if the output violates the constraints, an equal proportion reduction and load transfer strategy are adopted to ensure that section safety constraints are met. The power generation water consumption of the system can be effectively reduced, and a technical thought is provided for medium-and-long-term transaction plan execution in a power market environment.

Description

technical field [0001] The invention belongs to the technical field of hydropower dispatching operation, and in particular relates to a method for decomposing electricity in monthly transaction plans of hydropower station groups in consideration of grid section constraints. Background technique [0002] The last decade or so has been a period of rapid development of my country's hydropower and power grid construction. Cascade hydropower stations in the main streams of the Jinsha River, Lancang River, and Yalong River in the southwest have been put into operation in clusters, forming a number of large-scale cascade hydropower stations with an installed capacity of over 10 million kilowatts. system, the national hydropower installed capacity also increased rapidly from breaking through 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 connection lines are used as links to realize the cross-basin an...

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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

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