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Unsteady flow control system for hydropower station downstream model test

A technology of unsteady flow and model testing, which is applied in the direction of control/regulation system, flow control of electrical devices, flow control, etc. It can solve complex system structure, slow response speed of flow adjustment, and inability to intuitively control the overall change trend of flow, etc. problem, to achieve the effect of high control precision and fast response

Active Publication Date: 2020-01-17
CHINA INST OF WATER RESOURCES & HYDROPOWER RES +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] (2) The flow control is realized by adjusting the angle of the electric valve with feedback. Although this method is not easily affected by the temperature and pressure of the medium, due to the lack of mathematical analysis between the opening of the electric valve and the output flow, the actual value needs to be fed back through the flowmeter , After the comparison, the electric valve is controlled. The system structure is relatively complicated, and the response speed of flow adjustment is slow and affects the control accuracy.
However, the traditional method of manually adjusting the frequency is extremely low in automation, and it is difficult to achieve precise control of flow changes in unsteady flow processes
However, the use of host computer control through communication protocols or analog ports has a high degree of automation, but it cannot intuitively control the overall change trend of flow during the evolution of unsteady flow, and is easily affected by the number of pumps and operating voltage.
[0011] (4) At present, the unsteady flow control methods of model tests in my country mainly focus on the regular sinusoidal change or step growth of the unsteady flow rate. A method for fully automatic control of the entire unsteady flow process, while the control accuracy and response speed still need to be improved

Method used

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  • Unsteady flow control system for hydropower station downstream model test

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Embodiment approach

[0037] (1) The flow change process of the unsteady flow is recorded in the data file corresponding to the time flow, and the control terminal constantly sends the flow corresponding to the time to the frequency conversion module according to the time in the data file, and the frequency conversion module continuously uses the time The corresponding flow rate is converted into the frequency of the pump motor and sent to the frequency converter, and the frequency converter continuously controls the motor frequency of the water pump according to the frequency of the water pump motor sent by the frequency conversion module, so that the water pump will strictly follow the flow change of the unsteady flow compiled in the data file The process transports water from an underground reservoir to the model forebay.

[0038] (2) When the difference between the real-time flow fed back by the electromagnetic flowmeter and the flow corresponding to the time in the data file exceeds 1L / s, the c...

Embodiment 1

[0051] The unsteady flow control system of the downstream model test of the hydropower station provided by the present invention is applied to the unsteady flow control of the downstream physical model of the Xiluodu Hydropower Station. Through application, it is found that the operation of the system is simple and clear, and it can strictly follow the data corresponding to the flow at a given time The file automatically controls the complete unsteady flow change process of the discharge of the power station under each working condition and combined working conditions, the control accuracy reaches 99%, and the overshoot is within 10L / s.

[0052] In summary, the embodiment of the present invention not only has fast response speed and high control precision, but also can accurately simulate and fully automatically control the unsteady flow process of power station discharge.

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Abstract

The invention discloses an unsteady flow control system for a hydropower station downstream model test. The unsteady flow control system compiles a flow change process of unsteady flow into a data file corresponding to time flow, wherein a control terminal is used for continuously sending the corresponding flow to a frequency conversion module according to the time in the data file; the frequencyconversion module is used for converting the flow into water pump motor frequency and sending the water pump motor frequency to a frequency converter; and the water pump motor frequency is controlledthrough the frequency converter, so that a water pump conveys water from an underground reservoir to a model forebay according to the flow change process of the unsteady flow compiled in the data file; an electric valve is arranged between the model forebay and a model downstream river channel, and the control terminal controls the opening degree of the electric valve according to the real-time flow fed back by an electromagnetic flowmeter and the real-time water level of the model forebay, so that the unsteady flow is controlled again. The unsteady flow control system is high in response speed and control precision, and the unsteady flow process of flow discharge of a power station can be accurately simulated and completely automatically controlled.

Description

technical field [0001] The invention relates to the technical field of downstream model tests of hydropower stations, in particular to an unsteady flow control system for downstream model tests of hydropower stations. Background technique [0002] During the operation of the power station, changes in electricity demand, the need for flood discharge tasks, and possible unit failures will cause changes in the discharge flow of the power station. Therefore, the power station discharges flow under various operating conditions such as peak regulation, flood discharge, and machine cut-off. Strong unsteady currents are induced in the downstream channel. As a result, problems such as steep rise and fall of the water level of the downstream river, rapid change of water surface gradient, large flow velocity variability, cross-flow and turbulent flow, and deterioration of flow state have been brought about. It is very likely to have adverse effects, thereby affecting safety, so it is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D7/06
CPCG05D7/0635
Inventor 邓安军於三大郭庆超权录年陆琴董先勇史红玲秦蕾蕾杜泽东李俊鹏胡海华吉祖稳王党伟董占地段淇元冯胜航沈铭晖
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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