Hydropower station hierarchical scheduling method and system with combination of medium and long term forecasts

Abstract

The invention discloses a hydropower station hierarchical scheduling method and system with the combination of medium and long term forecasts. The hydropower station hierarchical scheduling method comprises the following steps that (1) a reservoir entry runoff series of guaranteed normal water supply years is divided into a high-flow year set, a median-water year set and a low-flow year set according to annual runoff; (2) hierarchical scheduling graphs are made for the reservoir entry runoff series in terms of the storage period and the delivery period; (3) corresponding reservoir scheduling graphs are selected in combination with qualitative medium and long term hydrologic forecast results and used for guiding operation scheduling of a hydropower station, wherein the high-flow year scheduling graph is selected for the high-flow years, the median-water year scheduling graph is selected for the median-water years, and the low-flow year scheduling graph is selected for the low-flow years. According to the hydropower station hierarchical scheduling method and system with combination of the medium and long term forecasts, the reservoir scheduling graphs are combined with the medium and long term forecasts, guaranteed output areas and increased output areas are divided again on the basis of the conception of output indication during the flood season, the adaptability of the scheduling graphs to different magnitudes of water inflow is improved, and the electricity generation benefits of the hydropower station are improved remarkably.

Description

technical field [0001] The invention belongs to reservoir power generation scheduling technology in the field of water conservancy engineering, and in particular relates to a hierarchical scheduling method and system for hydropower stations combined with medium and long-term forecasting. Background technique [0002] At present, the reservoir dispatching method based on the conventional dispatching chart has the following deficiencies: (1) It is easy to increase the amount of discarded water in wet years, thereby losing the power generation benefit of the reservoir. The anti-damage line and limiting output line in the prior art are obtained by taking the upper and lower envelope lines from the adjustment calculation of the inflow runoff series in the year of normal water supply, and the rules of increasing output and limiting output in different years in the inflow runoff series are consistent , so it is easy to lead to an increase in the amount of water discarded in wet yea...

AI Technical Summary

Problems solved by technology

[0002] At present, the reservoir dispatching method based on the conventional dispatching chart has the following deficiencies: (1) It is easy to increase the amount of discarded water in wet years, thereby losing the power generation benefit of the reservoir

The anti-damage line and limiting output line in the prior art are obtained by taking the upper and lower envelope lines from the adjustment calculation of the inflow runoff series in the year of normal water supply, and the rules of increasing output and limiting output in different years in the inflow runoff series are consistent , so it is easy to lead to an increase in the amount of water discarded in wet years, which is not conducive to the full utilization of water resources

(2) Medium and long-term forecasts are not considered

Although the dual-guarantee output scheduling diagram distinguishes the different water conditions in the flood season and the non-flood season, which improves the utilization rate of water resources in the flood season to a certain extent, it still has the following deficiencies: (1) It only distinguishes the water flow in the flood season and the non-flood season Seasonal differences do not fully take into account the differences in inflow levels, and there is still room for improvement in power generation during flood seasons

(2) The design guarantee rate cannot be guaranteed, and the reliability is poor

When operating according to the dual-guarantee output scheduling chart, it is easy to cause some years to become damage years due to excessive output during the flood season, which makes the water supply unable to be fully stored at the beginning of the period.

(3) The combination of reservoir dispatching map and medium and long-term forecast is still not considered

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