River type reservoir energy storage capacity measuring and calculating method considering backwater influence

Abstract

The invention discloses a method for measuring and calculating the stored energy of a riverway type reservoir considering the influence of backwater, which is characterized in that the water storage of the riverway type reservoir is calculated based on station network layout and the topographic features of the riverway, the total stored energy of the reservoir is calculated through a water consumption rate curve, and the method comprises three links of section division, water storage calculation and stored energy conversion. The real-time reservoir water storage amount can be calculated according to the dynamic water surface line; according to the method, the dynamic reservoir capacity error caused by the reservoir backwater influence can be effectively reduced, a more accurate calculation result of the total water storage amount is obtained, and more accurate calculation of the total water storage amount is realized, so that the safety of a power grid is guaranteed and medium-and-long-term scheduling of the reservoir is guided.

Description

technical field [0001] The invention belongs to the field of reservoir regulation, and in particular relates to a method for calculating the storage energy of a channel-type reservoir considering the influence of backwater. Background technique [0002] Reservoir storage energy calculation is an important monitoring index to ensure the safety of the power grid and guide the medium and long-term operation of the reservoir. The core calculation content is the calculation of the reservoir water storage capacity. The traditional reservoir water storage capacity calculation usually takes the water level in front of the dam as the representative water level of the reservoir. Taking the water level before the dam as the reference point, the water storage capacity is obtained through the interpolation of the water level and storage capacity curve. The interpolation of the static storage capacity curve of the water level is mainly based on two assumptions. It is considered that the t...

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Problems solved by technology

[0003] However, this method ignores the backwater phenomenon at the upstream end of the reservoir area and the additional gradient effect along the upstream and downstream of the reservoir. For small reservoirs and lake-type reservoirs, the error is within an acceptable range, but for large reservoirs, especially For narrow and long river channel reservoirs, there are different degrees of backwater at the end of the reservoir. At the same time, due to the large ratio of length to width, there is a certain additional gradient in the upstream and downstream of the reservoir area under the influence of the river flow velocity, which is different from the aforementioned reservoir level. The assumptions are contradictory; due to the impact of backwater, this type of reservoir usually forms a large wedge-shaped storage capacity at the tail of the reservoir, which causes large errors in the calculation results of traditional methods, such as drastic changes in reservoir storage in a short period of time, and the calculation of water balance The inflow flow fluctuates sawtooth, the inflow flow or the outflow flow is negative, etc., which greatly affects the power grid dispatching operation and the fine-grained reservoir dispatching; therefore, it is necessary to propose a calculation method for the storage capacity of river-type reservoirs that considers the impact of backwater to solve the above problems

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