Feedforward control method for opening and closing time of open channel water dispatching gate

Abstract

The invention discloses a feedforward control method for the opening and closing time of an open channel water dispatching gate. A system using the method comprises a water delivery open channel and a control system. Regulators are arranged at the upstream and downstream of the water delivery open channel. A water intake is disposed at the downstream of the water delivery open channel, is close to channel buildings, that is, the downstream of the water intake is the regulator or weir. A water flow may generate backwater due to the impact of the buildings. The backwater influence in the channel divides the channel into two sub channel sections by means of a theory such as an ID model. A rising water wave from the upstream is equal to a falling water wave due to the water acquisition of the water intake. A storage volume change in the downstream of the water intake is zero, that is, no water abandoning operation is in the channel, which requires the water should be taken after the rising water wave arrives at the water intake and before the increment of the flow at the water intake reaches a set water taking amount. The feedforward control method improves the water use efficiency of the channel system, reduces a waste of water resources, and improves the economic benefit of the channel water supply.

Description

technical field [0001] The invention relates to an open channel dispatching method, in particular to a feedforward control method for delayed opening and closing time of an open channel water transfer dispatching gate. Background technique [0002] Water is the source of life and an essential factor in a series of civilized activities such as human survival, urban operation, and industrial development. However, my country's water resources are unevenly distributed across regions, generally showing more in the south than in the north, more in summer and less in winter. In addition, the long-term lack of water resources in the northwest of my country has seriously affected the development of the regional economy. In order to alleviate the water shortage in the north, the country has made great efforts in the rational distribution of water resources, and built a large number of water diversion projects, such as diverting the Yellow River to Jin, diverting Luan to Tianjin, dive...

AI Technical Summary

Problems solved by technology

Especially for the feed-forward control of the canal system, if the lag time in the canal system cannot be accurately known, water supply shortage or water abandonment will occur

For example, in the feed-forward link of canal system control, when the upstream control gate is opened and the water intake in the canal is subsequently opened to take water, if the water intake is opened to take water before the surge wave caused by the opening of the control gate, it will cause The downstream flow of the water intake drops, which affects the water intake of downstream users; and opening the water intake after the rising water wave passes the water intake will cause a part of the upstream water to become waste water, affecting the water use efficiency of the entire canal system

In the control operation of the canal, the lag time of the canal system can be calculated by unsteady flow simulation, but it is difficult to determine the start time of water intake at the water intake

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