Water supply system using power generation tail water and scheduling method thereof

Abstract

The application provides a water supply system using power generation tail water and a scheduling method thereof, comprising a water inlet gate arranged on a river channel and located downstream of a power station; a water storage chamber which is a water storage space arranged underground and is communicated with the water inlet gate; a water lifting pump station communicated with the water storage chamber, a water supply gate being arranged between the water lifting pump station and the water storage chamber; a first reservoir communicated with the water lifting pump station; the first reservoir is communicated with a terminal reservoir through a water conveying tunnel arranged underground, and a first control gate is arranged on the water conveying tunnel; a first pressurizing pump station, a water inlet end of which is communicated with the water conveying tunnel through a first water inlet channel, the first water inlet channel being located upstream of the first control gate, and a water outlet end of the first pressurizing pump station is communicated with the water conveying tunnel through a first water outlet channel, the first water outlet channel being located downstream of the first control gate. The problems of contradiction and conflict between power generation and water supply in the prior art and the adverse effect of the existing water supply system on the ecological environment are solved.

Description

Technical Field

[0001] This invention relates to the field of water supply system technology, and in particular to a water supply system utilizing power generation tailwater and its scheduling method. Background Technology

[0002] As one of the countries with relatively low per capita water resources in the world, my country faces uneven spatial and temporal distribution of water resources. Northern regions have long faced resource-based water shortages, while southern regions are frequently plagued by seasonal water shortages. With accelerated urbanization and economic and social development, water demand continues to rise, and the contradiction between industrial, agricultural, and domestic water use is becoming increasingly prominent, further straining the water supply and demand relationship. On the supply side, traditional surface water and groundwater development has reached its limits, with over-extraction even occurring in some areas, leading to secondary problems such as land subsidence and ecological degradation, highlighting the severe challenges on the supply side. At the same time, existing water supply systems often suffer from problems such as extensive scheduling and low efficiency, making it difficult to cope with extreme weather events and sudden pollution risks, further exacerbating the complexity of water resource management.

[0003] Optimizing water resource allocation through rational planning is a key approach to solving this problem, requiring intelligent and refined management methods to coordinate the relationships between multiple water sources, users, and objectives. Researching how to construct a scientifically sound water supply allocation system is not only crucial for the efficient use of water resources but also directly impacts national water security strategies and ecological civilization construction. Advanced joint water quantity and quality allocation models, big data analysis, and intelligent decision-making technologies can enable a shift from "passive response" to "proactive regulation," enhancing the resilience and reliability of the water supply system. The significant implications of this research also lie in its ability to provide technical support for overcoming water scarcity, lay the foundation for coordinated regional development, and ultimately serve the realization of sustainable economic and social development and the goal of building a beautiful China.

[0004] The selection of water sources for water diversion projects must consider not only the convenience of water intake but also the various impacts on the water source area. Currently, for existing or under-construction power generation projects, water is usually drawn directly upstream of the power station. This method can lead to water level fluctuations, which in turn affect power generation efficiency and grid stability. At the same time, the existing water supply system has adverse effects on the local landscape, other environmental water use, and estuary ecology. Summary of the Invention

[0005] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a water supply system and its scheduling method that utilizes the tailwater from power generation, in order to solve the problems of conflict between power generation and water supply in the prior art, as well as the adverse impact of the existing water supply system on the ecological environment.

[0006] To achieve the above and other related objectives, the first aspect of the present invention provides a water supply system utilizing tailwater from a power plant, comprising: an intake gate located on the river channel and downstream of the power plant; a water storage cavern, which is an underground water storage space connected to the intake gate; a pumping station connected to the water storage cavern, with a water supply gate between the pumping station and the water storage cavern; a first reservoir connected to the pumping station; and a terminal water supply system. The first reservoir is connected to the terminal reservoir via an underground water conveyance tunnel, and the water conveyance tunnel is equipped with a first control gate. The terminal reservoir is the downstream reservoir of the water supply system. A first booster pump station has its inlet connected to the water conveyance tunnel via a first inlet channel, which is located upstream of the first control gate. The outlet of the first booster pump station is connected to the water conveyance tunnel via a first outlet channel, which is located downstream of the first control gate.

[0007] Furthermore, it also includes a second reservoir, which is located downstream of the first booster pump station. The inlet of the second reservoir is connected to the water conveyance tunnel through a second inlet channel, and a second control gate is provided on the second inlet channel. The outlet of the second reservoir is connected to the water conveyance tunnel through a second outlet channel, and a third control gate is provided on the second outlet channel. A fourth control gate is provided on the water conveyance tunnel and located between the second inlet channel and the second outlet channel.

[0008] Furthermore, it also includes a second booster pump station, which is located downstream of the second reservoir. The inlet of the second booster pump station is connected to the water conveyance tunnel through a third inlet channel, and the outlet of the second booster pump station is connected to the water conveyance tunnel through a third outlet channel. A fifth control gate is provided on the water conveyance tunnel between the third inlet channel and the third outlet channel.

[0009] Furthermore, a transition reservoir is provided between the water conveyance tunnel and the terminal reservoir. The transition reservoir is connected to the terminal reservoir through a water conveyance pipeline, and an on / off valve is provided on the water conveyance pipeline.

[0010] Furthermore, two water transmission pipelines are provided between the transition reservoir and the terminal reservoir, and each of the two water transmission pipelines is equipped with an on / off valve.

[0011] Furthermore, the water storage cavern is equipped with two liquid level sensors, which are respectively set at the design water level and the lowest water level of the water storage cavern.

[0012] As described above, the water supply system utilizing power generation tailwater of the present invention has the following beneficial effects: The water supply system of the present invention uses water that has already been used by the power station after flowing through it as the water source for the water diversion project by setting up an intake gate downstream of the power station. This achieves the recycling of water resources and avoids the problem of water level fluctuations caused by directly drawing water upstream of the power station, which would affect the power generation efficiency and grid stability. Simultaneously, the water supply system of the present invention uses underground water storage caverns to store water, saving land resources, reducing the amount of dam construction and reservoir construction work, and the costs of land acquisition and resettlement, thus saving project investment and achieving good economic benefits. Furthermore, the water storage caverns and reservoir water supply of the present invention can work together to improve efficiency, or work independently to ensure the safety and stability of the system, exhibiting high flexibility.

[0013] Another aspect of the present invention provides a scheduling method for a water supply system utilizing power generation tailwater as described above, the scheduling method specifically including the following steps: During the period of high water level in the river channel: In the first stage, the water intake gate, water supply gate, water pumping station, and first booster pumping station are opened, and the first control gate is closed to store water into the water storage cavern, the first reservoir, and the terminal reservoir. In the second stage, once the water storage cavern reaches the design water level, the inlet gate is closed, and the water in the water storage cavern continues to be stored in the first reservoir. When the water level in the water storage cavern drops to the lowest water level, the inlet gate is opened again to store water in the water storage cavern. Once the first reservoir reaches the normal water level, the water supply gate and the pumping station are closed. Once the water storage cavern reaches the design water level again, the inlet gate is closed. In the third stage, the first reservoir continues to supply water to the terminal reservoir through the water conveyance tunnel and after being pressurized by the first booster pump station. When the terminal reservoir reaches the normal water level, the first booster pump station is shut down and the water supply stops. When the terminal reservoir reaches the lowest water level, the first booster pump station is turned on again to supply water to the terminal reservoir. In the fourth stage, when the water level in the first reservoir drops to the lowest level, the water supply gate and the pumping station are opened to store water into the first reservoir through the water in the storage cavern; when the water level in the storage cavern drops to the lowest level, the inlet gate is opened to store water into the storage cavern. The period of low water level in the river channel: In the first stage, the intake gate, water supply gate, water pumping station, and first control gate are opened, and the first booster pumping station is closed to store water into the water storage cavern, the first reservoir, and the terminal reservoir.

[0014] In the second stage, once the water storage cavern reaches the design water level, the inlet gate is closed, and the water in the water storage cavern continues to be stored in the first reservoir. When the water level in the water storage cavern drops to the lowest water level, the inlet gate is opened again to store water in the water storage cavern. Once the first reservoir reaches the normal water level, the water supply gate and the pumping station are closed. Once the water storage cavern reaches the design water level again, the inlet gate is closed. In the third stage, the first reservoir continues to supply water to the terminal reservoir through the water conveyance tunnel. When the terminal reservoir reaches the normal water level, the first control gate is closed to stop the water supply. When the terminal reservoir reaches the lowest water level, the first control gate is opened again to supply water to the terminal reservoir. In the fourth stage, when the water level in the first reservoir drops to the lowest level, the water supply gate and the pumping station are opened to store water in the first reservoir through the water in the storage cavern. When the water level in the storage cavern drops to the lowest level, the inlet gate is opened to store water in the storage cavern.

[0015] The scheduling method of the water supply system utilizing power generation tailwater of the present invention has the same beneficial effects as the water supply system utilizing power generation tailwater described above, and will not be repeated here. Attached Figure Description

[0016] Figure 1 The diagram shown is a cross-sectional view of the water supply system utilizing power generation tailwater provided by the present invention.

[0017] Figure 2 The diagram shown is a plan view of the water supply system utilizing power generation tailwater provided by the present invention.

[0018] Explanation of reference numerals in the attached figures 10-Intake gate; 20-Water storage cavern; 21-Water supply gate; 30-Water pumping station; 40-First reservoir; 401-Water conveyance tunnel; 4011-First control gate; 4012-Fourth control gate; 4013-Fifth control gate; 50-First booster pumping station; 501-First intake channel; 502-First outlet channel; 60-Second reservoir; 601-Second intake channel; 602-Second outlet channel; 6011-Second control gate; 6021-Third control gate; 70-Second booster pumping station; 701-Third intake channel; 702-Third outlet channel; 80-Transition reservoir; 801-Water conveyance pipeline; 8011-On / off valve; 90-Terminal reservoir; 100-River channel. Detailed Implementation

[0019] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0020] In the description of this invention, it should be noted that, unless otherwise specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or a connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0021] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., used to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] Please see Figures 1 to 2 It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0023] The first aspect of this invention provides a water supply system utilizing tailwater from a power plant, which is applied to a river channel where a power plant is located, such as... Figure 1 and Figure 2As shown, the water supply system utilizing the tailwater from the power plant includes an intake gate 10 located on a river channel 100, downstream of the power station on the river channel 100. It also includes a water storage cavern 20, an underground water storage space connected to the intake gate 10, and a pumping station 30 connected to the water storage cavern 20. A water supply gate 21 is provided between the pumping station 30 and the water storage cavern 20. Specifically, it also includes a first reservoir 40 connected to the pumping station 30, which is connected to an underground water conveyance tunnel 4. 01 is connected to the terminal reservoir 90, and a first control gate 4011 is provided on the water conveyance tunnel 401. Specifically, the terminal reservoir 90 is the downstream reservoir of the water supply system, and also includes a first booster pump station 50. The water inlet of the first booster pump station 50 is connected to the water conveyance tunnel 401 through a first water inlet channel 501, and the first water inlet channel 501 is located upstream of the first control gate 4011. The water outlet of the first booster pump station 50 is connected to the water conveyance tunnel 401 through a first water outlet channel 502, and the first water outlet channel 502 is located downstream of the first control gate 4011.

[0024] The beneficial effects of the water supply system utilizing the tailwater of a power plant are as follows: The water supply system of this invention uses water that has already been used by the power plant after flowing through it, by setting up an intake gate downstream of the power plant as the water source for the water diversion project. This achieves the recycling of water resources and avoids the problem of water level fluctuations caused by directly drawing water upstream of the power plant, which would affect the power generation efficiency and grid stability. Simultaneously, the water supply system of this invention uses underground storage caverns to store water, saving land resources, reducing the amount of dam construction and reservoir construction, and the costs of land acquisition and resettlement, thus saving project investment and achieving good economic benefits. Furthermore, the water storage caverns and reservoir water supply of this invention can work together to improve efficiency, or work independently to ensure the safety and stability of the system, exhibiting high flexibility.

[0025] Another aspect of the present invention provides a scheduling method for a water supply system utilizing power generation tailwater as described above, the scheduling method specifically including the following steps: During the period of high water level in the river channel: In the first stage, the water intake gate 10, water supply gate 21, water pumping station 30, and first booster pumping station 50 are opened, and the first control gate 4011 is closed to store water into the water storage cavern 20, the first reservoir 40, and the terminal reservoir 90. In the second stage, after the water storage cavern 20 reaches the design water level, the inlet gate 10 is closed, and the water in the water storage cavern 20 continues to store water in the first reservoir 40. When the water level in the water storage cavern 20 drops to the lowest water level, the inlet gate 10 is opened again to store water in the water storage cavern 20. After the first reservoir 40 reaches the normal water level, the water supply gate 21 and the water pumping station 30 are closed. After the water storage cavern 20 reaches the design water level again, the inlet gate 10 is closed. In the third stage, the first reservoir 40 continues to supply water to the terminal reservoir 90 after being pressurized by the first booster pump station 50 through the water conveyance tunnel 401. When the terminal reservoir 90 reaches the normal water level, the first booster pump station 50 is shut down to stop the water supply. When the terminal reservoir 90 reaches the minimum water level, the first booster pump station 50 is turned on again to supply water to the terminal reservoir 90. In the fourth stage, when the water level in the first reservoir 40 drops to its lowest level, the water supply gate 21 and the pumping station 30 are opened, and water is pumped through the water storage chamber 20 to... The first reservoir 40 stores water; when the water level in the storage cavern 20 drops to the lowest level, the inlet gate 10 is opened to store water into the storage cavern 20. The period of low water level in the river channel: In the first stage, the water inlet gate 10, water supply gate 21, water pumping station 30, and first control gate 4011 are opened, and the first booster pumping station 50 is closed to store water into the water storage cavern 20, the first reservoir 40, and the terminal reservoir 90.

[0026] In the second stage, after the water storage cavern 20 reaches the design water level, the inlet gate 10 is closed, and the water in the water storage cavern 20 continues to store water in the first reservoir 40. When the water level in the water storage cavern 20 drops to the lowest water level, the inlet gate 10 is opened again to store water in the water storage cavern 20. After the first reservoir 40 reaches the normal water level, the water supply gate 21 and the water pumping station 30 are closed. After the water storage cavern 20 reaches the design water level again, the inlet gate 10 is closed. In the third stage, the first reservoir 40 continues to supply water to the terminal reservoir 90 through the water conveyance tunnel 401. When the terminal reservoir 90 reaches the normal water level, the first control gate 4011 is closed to stop the water supply. When the terminal reservoir 90 reaches the minimum water level, the first control gate 4011 is opened again to supply water to the terminal reservoir 90. In the fourth stage, when the water level in the first reservoir 40 drops to the lowest level, the water supply gate 21 and the pumping station 30 are opened to store water in the first reservoir 40 through the water storage cavern 20. When the water level in the water storage cavern 20 drops to the lowest level, the inlet gate 10 is opened to store water in the water storage cavern 20.

[0027] Furthermore, such as Figure 1 and Figure 2As shown, this embodiment also includes a second reservoir 60, located downstream of the first booster pump station 50. The inlet of the second reservoir 60 is connected to the water conveyance tunnel 401 via a second inlet channel 601, and a second control gate 6011 is provided on the second inlet channel 601. The outlet of the second reservoir 60 is connected to the water conveyance tunnel 401 via a second outlet channel 602, and a third control gate 6021 is provided on the second outlet channel 602. Specifically, a fourth control gate 4012 is provided on the water conveyance tunnel 401 between the second inlet channel 601 and the second outlet channel 602. By setting up the second reservoir 60, i.e., setting up another reservoir between the first reservoir 40 and the terminal reservoir 90, the water storage and pressure stabilization capacity along the line can be increased, and the water supply security of the section from the first reservoir to the second reservoir and the section from the second reservoir to the terminal reservoir can be improved.

[0028] Furthermore, such as Figure 1 As shown, in this embodiment, a second booster pump station 70 is also included. The second booster pump station 70 is located downstream of the second reservoir 60. The water inlet of the second booster pump station 70 is connected to the water conveyance tunnel 401 through a third water inlet channel 701, and the water outlet of the second booster pump station 70 is connected to the water conveyance tunnel 401 through a third water outlet channel 702. A fifth control gate 4013 is provided on the water conveyance tunnel 401 between the third water inlet channel 701 and the third water outlet channel 702. Specifically, based on the relationship that energy loss in water flow is proportional to the square of the flow velocity, when the river 100 is at a high water level, opening the intake gate 10 for water supply results in a high flow velocity and significant energy loss along the entire route. When the water flows through the water conveyance tunnel 401 to the terminal reservoir 90, the first control gate 4011 and the fifth control gate 4013 can be closed. This allows the water to be pressurized twice by the first booster pump station 50 and the second booster pump station 70 before continuing its journey to the terminal reservoir 90, thus compensating for the energy loss during transport. This invention features two-stage booster pump stations, offering more flexible operation and scheduling, stronger resistance to failure risks, and higher pump operating efficiency. Furthermore, for long-distance water conveyance systems, it can lower the pipeline pressure requirements, thereby reducing investment costs.

[0029] Furthermore, such as Figure 1As shown, in this embodiment, a transition reservoir 80 is provided between the water conveyance tunnel 401 and the terminal reservoir 90. The transition reservoir 80 is connected to the terminal reservoir 90 via a water conveyance pipeline 801, which is equipped with an on / off valve 8011. This invention sets up a transition reservoir 80 upstream of the terminal reservoir 90, and this transition reservoir 80 supplies water to the terminal reservoir via the water conveyance pipeline 801, instead of conveying water to the terminal reservoir through an underground water conveyance tunnel. This arrangement takes into account the influence of terrain; in some areas, the cost of constructing underground tunnels is too high or difficult to build. Therefore, by setting up a transition reservoir 80 upstream of the terminal reservoir 90, and having this transition reservoir 80 convey water to the terminal reservoir 90 via the water conveyance pipeline 801, the construction cost can be greatly reduced.

[0030] Furthermore, to prevent damage or blockage of the water supply pipeline 801 that would prevent normal water supply to the terminal reservoir 90, preferably, as follows: Figure 1 As shown, in this embodiment, two water supply pipes 801 are provided between the transition reservoir 80 and the terminal reservoir 90, and both water supply pipes 801 are equipped with on / off valves 8011. By setting up two water supply pipes, when one water supply pipe has a problem, the other water supply pipe can be used to supply water, thereby ensuring the uninterrupted water supply to the terminal reservoir.

[0031] Furthermore, in order to facilitate timely monitoring of the water level in the water storage cavern, in this embodiment, two liquid level sensors (not shown in the figure) are installed in the water storage cavern 20. The two liquid level sensors are respectively installed at the design water level and the lowest water level of the water storage cavern 20.

[0032] As a preferred embodiment, according to Figure 1 and Figure 2 This embodiment proposes a more specific scheduling method for the water supply system utilizing the tailwater from power generation: During periods of high water levels in the river channel: make full use of the upstream raw water head and reduce the downstream boosting head, even if the water conveyance line does not pass through the second reservoir; In the first stage, the water intake gate 10, water supply gate 21, water pumping station 30, first booster pumping station 50, second booster pumping station 70, fourth control gate 4012, and on / off valve 8011 are opened, and the first control gate 4011, second control gate 6011, third control gate 6021, and fifth control gate 4013 are closed to store water into the water storage cavern 20, the first reservoir 40, and the terminal reservoir 90.

[0033] In the second stage, after the water storage cavern 20 reaches the design water level, the inlet gate 10 is closed, and the water in the water storage cavern 20 continues to store water for the first reservoir 40. When the water level in the water storage cavern 20 drops to the lowest water level, the inlet gate 10 is opened again to store water for the water storage cavern 20. After the first reservoir 40 reaches the normal water level, the water supply gate 21 and the pumping station 30 are closed. After the water storage cavern 20 reaches the design water level again, the inlet gate 10 is closed. In the third stage, the first reservoir 40 continues to supply water to the terminal reservoir 90 after being pressurized by the first booster pump station 50 and the second booster pump station 70 through the water conveyance tunnel 401. When the terminal reservoir 90 reaches the normal water level, the first booster pump station 50, the second booster pump station 70, the fourth control gate 4012, and the on / off valve 8011 are closed to stop the water supply. When the terminal reservoir 90 reaches the minimum water level, the first booster pump station 50, the second booster pump station 70, the fourth control gate 4012, and the on / off valve 8011 are reopened to supply water to the terminal reservoir 90. In the fourth stage, when the water level in the first reservoir 40 drops to the lowest level, the water supply gate 21 and the pumping station 30 are opened to store water in the first reservoir 40 through the water storage cavern 20; when the water level in the water storage cavern 20 drops to the lowest level, the water inlet gate 10 is opened to store water in the water storage cavern 20. During the low water level period of the river channel: the water conveyance tunnel 401 connects to the second reservoir 60, which can increase the regulation and pressure stabilization capacity along the line, and also improve the water supply security of the section from the first reservoir 40 to the second reservoir 60 and the section from the second reservoir 60 to the terminal reservoir 90. In the first stage, the water intake gate 10, water supply gate 21, water pumping station 30, first control gate 4011, second control gate 6011, third control gate 6021, fifth control gate 4013, and on / off valve 8011 are opened, and the first booster pumping station 50, second booster pumping station 70, and fourth control gate 4012 are closed to store water into the water storage cavern 20, the first reservoir 40, the second reservoir 60, and the terminal reservoir 90. In the second stage, after the water storage cavern 20 reaches the design water level, the inlet gate 10 is closed, and the water in the water storage cavern 20 continues to store water for the first reservoir 40. When the water level in the water storage cavern 20 drops to the minimum water level, the inlet gate 10 is opened again to store water for the water storage cavern 20. After the first reservoir 40 reaches the normal water level, the water supply gate 21 and the pumping station 30 are closed. After the water storage cavern 20 reaches the design water level again, the inlet gate 10 is closed. In the third stage, the first reservoir 40 continues to supply water to the terminal reservoir 90 through the water conveyance tunnel 401 and the second reservoir 60. When the terminal reservoir 90 reaches the normal water level, the first control gate 4011, the second control gate 6011, the third control gate 6021, the fifth control gate 4013, and the on / off valve 8011 are closed to stop the water supply. When the terminal reservoir 90 reaches the minimum water level, the first control gate 4011, the second control gate 6011, the third control gate 6021, the fifth control gate 4013, and the on / off valve 8011 are opened again to supply water to the terminal reservoir 90. In the fourth stage, when the water level in the first reservoir 40 drops to the lowest water level, the water supply gate 21 and the water pumping station 30 are opened to store water in the first reservoir 40 through the water storage cavern 20; when the water level in the water storage cavern 20 drops to the lowest water level, the water inlet gate 10 is opened to store water in the water storage cavern 20. In summary, this invention utilizes a power plant tailwater supply system and its scheduling method, employing water that has already been used by the power plant as the water source for a water diversion project. This enables the recycling of water resources and avoids the problems of water level fluctuations caused by direct water intake upstream of the power plant, which could affect power generation efficiency and grid stability. Furthermore, the water supply system of this invention uses underground storage caverns to store water, saving land resources, reducing the amount of dam construction and reservoir construction, and minimizing land acquisition and resettlement costs, thus saving on project investment and yielding good economic benefits. It also enables the storage and release of water resources, improving the utilization efficiency of renewable clean energy and solving the problem of energy waste. Moreover, the water storage caverns and reservoir water supply of this invention can work together to improve efficiency, or work independently to ensure system safety and stability, exhibiting high flexibility. Therefore, this invention effectively overcomes the various shortcomings of existing technologies and has high industrial application value.

[0034] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A water supply system utilizing tailwater from a power plant, applied to a river channel equipped with a power station, characterized in that, include: A water intake gate (10) is provided on the river channel (100) and located downstream of the power station; Water storage cavern (20), the water storage cavern (20) is a water storage space set underground, the water storage cavern (20) is connected to the water inlet gate (10); A water pumping station (30) is connected to the water storage cavern (20), and a water supply gate (21) is provided between the water pumping station (30) and the water storage cavern (20). The first reservoir (40) is connected to the water pumping station (30); The terminal reservoir (90) is connected to the first reservoir (40) through an underground water conveyance tunnel (401), and the water conveyance tunnel (401) is equipped with a first control gate (4011). The terminal reservoir (90) is the downstream reservoir of the water supply system. The first booster pump station (50) has its inlet end connected to the water conveyance tunnel (401) via a first inlet channel (501). The first inlet channel (501) is located upstream of the first control gate (4011). The outlet end of the first booster pump station (50) is connected to the water conveyance tunnel (401) via a first outlet channel (502). The first outlet channel (502) is located downstream of the first control gate (4011).

2. The water supply system utilizing power generation tailwater according to claim 1, characterized in that, It also includes a second reservoir (60), which is located downstream of the first booster pump station (50). The inlet of the second reservoir (60) is connected to the water conveyance tunnel (401) through a second inlet channel (601), and a second control gate (6011) is provided on the second inlet channel (601). The outlet of the second reservoir (60) is connected to the water conveyance tunnel (401) through a second outlet channel (602), and a third control gate (6021) is provided on the second outlet channel (602). A fourth control gate (4012) is provided on the water conveyance tunnel (401) and between the second inlet channel (601) and the second outlet channel (602).

3. The water supply system utilizing power generation tailwater according to claim 2, characterized in that, It also includes a second booster pump station (70), which is located downstream of the second reservoir (60). The water inlet of the second booster pump station (70) is connected to the water conveyance tunnel (401) through a third water inlet channel (701), and the water outlet of the second booster pump station (70) is connected to the water conveyance tunnel (401) through a third water outlet channel (702). A fifth control gate (4013) is provided on the water conveyance tunnel (401) and between the third water inlet channel (701) and the third water outlet channel (702).

4. The water supply system utilizing power generation tailwater according to claim 1, characterized in that, A transition reservoir (80) is provided between the water conveyance tunnel (401) and the terminal reservoir (90). The transition reservoir (80) is connected to the terminal reservoir (90) through a water conveyance pipeline (801). An on / off valve (8011) is provided on the water conveyance pipeline (801).

5. The water supply system utilizing power generation tailwater according to claim 4, characterized in that, Two water conveyance pipelines (801) are provided between the transition reservoir (80) and the terminal reservoir (90), and each of the two water conveyance pipelines (801) is equipped with an on / off valve (8011).

6. The water supply system utilizing power generation tailwater according to claim 1, characterized in that, The water storage cavern (20) is equipped with two liquid level sensors, which are respectively set at the design water level and the lowest water level of the water storage cavern (20).

7. A scheduling method for a water supply system utilizing power generation tailwater as described in any one of claims 1 to 6, characterized in that, The scheduling method includes the following steps: During the period of high water level in the river channel: In the first stage, the water intake gate (10), water supply gate (21), water pumping station (30), and first booster pumping station (50) are opened, and the first control gate (4011) is closed to store water into the water storage cavern (20), the first reservoir (40), and the terminal reservoir (90). In the second stage, when the water storage cavern (20) reaches the design water level, the inlet gate (10) is closed, and the water in the water storage cavern (20) continues to be stored in the first reservoir (40). When the water level in the water storage cavern (20) drops to the lowest water level, the inlet gate (10) is opened again to store water in the water storage cavern (20). When the first reservoir (40) reaches the normal water level, the water supply gate (21) and the pumping station (30) are closed. When the water storage cavern (20) reaches the design water level again, the inlet gate (10) is closed. In the third stage, the first reservoir (40) continues to supply water to the terminal reservoir (90) after being pressurized by the first booster pump station (50) through the water conveyance tunnel (401). When the terminal reservoir (90) reaches the normal water level, the first booster pump station (50) is shut down and the water supply is stopped. When the terminal reservoir (90) reaches the lowest water level, the first booster pump station (50) is turned on again to supply water to the terminal reservoir (90). In the fourth stage, when the water level in the first reservoir (40) drops to the lowest level, the water supply gate (21) and the pumping station (30) are opened to store water in the first reservoir (40) through the water storage cavern (20); when the water level in the water storage cavern (20) drops to the lowest level, the water inlet gate (10) is opened to store water in the water storage cavern (20). The period of low water level in the river channel: In the first stage, the water intake gate (10), water supply gate (21), water pumping station (30), and first control gate (4011) are opened, and the first booster pumping station (50) is closed to store water into the water storage cavern (20), the first reservoir (40), and the terminal reservoir (90). In the second stage, when the water storage cavern (20) reaches the design water level, the inlet gate (10) is closed, and the water in the water storage cavern (20) continues to be stored in the first reservoir (40). When the water level in the water storage cavern (20) drops to the lowest water level, the inlet gate (10) is opened again to store water in the water storage cavern (20). When the first reservoir (40) reaches the normal water level, the water supply gate (21) and the pumping station (30) are closed. When the water storage cavern (20) reaches the design water level again, the inlet gate (10) is closed. In the third stage, the first reservoir (40) continues to supply water to the terminal reservoir (90) through the water conveyance tunnel (401). When the terminal reservoir (90) reaches the normal water level, the first control gate (4011) is closed to stop the water supply. When the terminal reservoir (90) reaches the lowest water level, the first control gate (4011) is opened again to supply water to the terminal reservoir (90). In the fourth stage, when the water level in the first reservoir (40) drops to the lowest level, the water supply gate (21) and the pumping station (30) are opened to store water in the first reservoir (40) through the water storage cavern (20). When the water level in the water storage cavern (20) drops to the lowest level, the water inlet gate (10) is opened to store water in the water storage cavern (20).

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