Upper reservoir layout structure of pumped storage power station

Abstract

The present invention relates to an upper reservoir layout structure for a pumped storage power station, and belongs to the technical field of hydropower engineering. The present invention includes a first retaining dam arranged in a river channel, a second retaining dam arranged on the upstream side of the first retaining dam, and an upper reservoir formed by the first retaining dam, the second retaining dam, and the mountain enclosures on both sides. A discharge culvert is pre-buried at the bottom of the upper reservoir. The discharge culvert is a horizontal culvert or an inverted siphon culvert. The water inlet of the discharge culvert is arranged in the river channel on the upstream side of the second retaining dam, and the water outlet of the discharge culvert is arranged in the river channel on the downstream side of the first retaining dam. The elevations of the first retaining dam and the second retaining dam can be designed according to the actual storage capacity requirements. Assuming that there are buildings such as important villages, it is sufficient to ensure that the locations of the first retaining dam and the second retaining dam are both located downstream of the important villages. Under the premise of meeting the storage capacity required for the power generation project, the present invention can avoid the flooding of important villages and reduce the investment in resettlement of immigrants.

Description

Technical Field

[0001] The invention relates to an upper reservoir arrangement structure of a pumped storage power station, belonging to the technical field of hydropower engineering. Background Art

[0002] With the large-scale development of renewable energy sources such as wind power and photovoltaics, and the gradual construction of a new power system dominated by renewable energy, the need for flexible power supply regulation has become more urgent. Pumped-storage power stations, with their peak-shaving and frequency-regulating functions, can ensure power system security and promote the large-scale development and consumption of system energy.

[0003] A pumped-storage power station typically consists of an upper reservoir, a lower reservoir, a water transmission system, and a power plant. The upper and lower reservoirs typically require a storage capacity of several million or tens of millions of cubic meters. The station operates in both pumping and generating modes. During periods of low electricity demand, excess electricity is used with a reversible pump-and-generator system to pump water from the lower reservoir to the upper reservoir. Water is then released to generate electricity during peak demand. The layout of a pumped-storage power station is often influenced by topographical and geological conditions, environmental protection, and resettlement considerations. For example, when selecting an upper reservoir, the natural gully terrain is typically utilized, with dams constructed at appropriate locations and surrounding mountains used to retain water to create sufficient effective storage capacity. However, if a significant village is located upstream of the proposed reservoir site, creating sufficient effective storage capacity by retaining water through the dam may result in flooding of the village due to the high water level. However, if the water level is lower than the village level, the effective storage capacity may not be sufficient. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a reservoir layout structure for a pumped storage power station which can avoid flooding important villages upstream and ensure sufficient effective storage capacity.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: the upper reservoir layout structure of the pumped storage power station includes a first water retaining dam arranged in the river channel, a second water retaining dam is arranged on the upstream side of the first water retaining dam, and the upper reservoir is formed by the first water retaining dam, the second water retaining dam and the mountain barriers on both sides. A spillway is pre-buried at the bottom of the upper reservoir. The spillway is a horizontal culvert or an inverted siphon culvert. The water inlet of the spillway is arranged in the river channel on the upstream side of the second water retaining dam, and the water outlet of the spillway is arranged in the river channel on the downstream side of the first dam.

[0006] Furthermore, the top elevations of the first retaining dam and the second retaining dam are the same.

[0007] Furthermore, a sand retaining dam is provided at the bottom of the water inlet of the drainage culvert.

[0008] Furthermore, a trash rack is arranged in the water inlet of the drainage culvert.

[0009] Furthermore, the water inlet of the spillway is arranged in the concrete structure platform, the area between the concrete structure platform and the upstream side of the second water retaining dam is provided with an earth and rock backfill structure layer, the top of the earth and rock backfill structure layer, the upstream and downstream water-facing surfaces of the second water retaining dam and the top surface of the second water retaining dam are provided with an integral structure concrete panel, and the concrete panel is connected to the concrete structure platform as a whole.

[0010] Furthermore, a stone bottom protection structure is provided at the bottom of the water outlet of the drainage culvert.

[0011] Furthermore, an earth and stone backfill footing structure is provided at the top of the outlet of the discharge culvert in an area close to the downstream dam surface of the first retaining dam.

[0012] Furthermore, the upper reservoir was built using a half-cut and half-fill method, and the discharge culvert is an inverted siphon culvert.

[0013] The beneficial effects of the present invention are: utilizing the natural gully terrain, building two dams at appropriate locations, and utilizing the upstream and downstream dams and the mountains on both sides of the river to retain water to form an upper reservoir. The elevations of the first dam and the second dam can be designed according to the actual storage capacity requirements. Assuming that there are important villages and other buildings, it is sufficient to ensure that the first dam and the second dam are located downstream of the important villages. Excess water in the upstream river channel can be directly discharged to the downstream through the pre-buried drainage culvert to ensure the safety of important villages upstream. Under the premise of meeting the storage capacity required for the power generation project, the present invention can avoid the flooding of important villages and reduce the investment in resettlement of immigrants. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a plan view of the present invention.

[0015] Figure 2 It is a schematic elevation view of the present invention.

[0016] Figure 3 This is a detailed structural diagram of the water inlet position of the drainage culvert in the present invention.

[0017] Markings in the figure: 1-upper reservoir, 2-important village, 3-sluiceway, 31-water inlet, 32-water outlet, 4-first retaining dam, 5-second retaining dam, 6-sand barrier, 7-trash rack, 8-concrete structure platform, 9-earth and rock backfill structure layer, 10-concrete panel, 11-stone bottom protection structure, 12-earth and rock backfill footing structure, 13-original ground line. DETAILED DESCRIPTION

[0018] To facilitate understanding and implementation of the present invention, preferred embodiments of the present invention are further described with reference to the accompanying drawings.

[0019] like Figures 1 to 3As shown, the present invention includes a first retaining dam 4 arranged in the river channel, a second retaining dam 5 is arranged on the upstream side of the first retaining dam 4, an upper reservoir 1 is formed by the first retaining dam 4, the second retaining dam 5 and the mountain enclosures on both sides, a discharge culvert 3 is pre-buried at the bottom of the upper reservoir 1, the discharge culvert 3 is a horizontal culvert or an inverted siphon culvert, the water inlet 31 of the discharge culvert 3 is arranged in the river channel on the upstream side of the second retaining dam 5, and the water outlet 32 ​​of the discharge culvert 3 is arranged in the river channel on the downstream side of the first retaining dam 4. In specific implementation, it is also possible to bury the discharge culvert 3 in the dam body, but treatment needs to be done between the earth-rock dam and the buried pipe. It is preferred to bury the discharge culvert 3 after digging a trench in the natural ground. Since the upper reservoir 1 is generally at a high elevation and its rainwater collection area is small, the flood generated is generally not too large. The use of culverts can meet the discharge and flood control flow requirements. The highest water level upstream should be lower than that of the important village 2. The water level can be ensured to meet the requirements by adjusting the number of discharge culverts 3. It is preferably designed to arrange multiple culverts side by side. The dam elevation can be designed according to the actual storage capacity requirements. In order to give full play to the water storage function of the dam, the top elevations of the first retaining dam 4 and the second retaining dam 5 are the same, and the dam top elevation is higher than the normal water level of the reservoir (normal water level of the reservoir + safety superelevation = dam top elevation). The water-facing surface of the retaining dam can be made of concrete panels 10 for anti-seepage to ensure structural safety. Assuming that there are buildings such as important villages 2, when implementing the present invention, it is only necessary to ensure that the positions of the first retaining dam 4 and the second retaining dam 5 are both located downstream of the important village 2. Under the premise of meeting the storage capacity required for the project power generation, the present invention can avoid the important village 2 from being flooded and reduce the investment in resettlement of immigrants.

[0020] Considering the balance between excavation and filling, the upper reservoir 1 is preferably constructed using a half-cut and half-fill method, so the reservoir bottom is partially excavated. In this case, the discharge culvert 3 is an inverted siphon culvert. Of course, if the reservoir is directly dammed without excavation, that is, a horizontal culvert is buried in the reservoir bottom instead of an inverted siphon culvert, this solution is also applicable.

[0021] To reduce the risk of silt accumulation blocking the drainage culvert 3, a sand barrier 6 is preferably installed at the bottom of the water inlet 31 of the drainage culvert 3. Since the upstream catchment area is small, flooding is minimal, and siltation is not a significant problem, the top elevation of the sand barrier 6 is a certain distance above the original ground line 13 to ensure a sufficient silt storage capacity.

[0022] In order to reduce the risk of debris clogging the drainage culvert 3, a trash rack 7 is provided in the water inlet 31 of the drainage culvert 3. It is understood that the sand barrier 6 and the trash rack 7 can be used in combination to achieve a better anti-clogging effect.

[0023] The top elevation of the water inlet 31 should generally be higher than the highest water level upstream to ensure that the water inlet 31 does not overflow. Preferably, the water inlet 31 of the discharge culvert 3 is arranged in the concrete structure platform 8, and the area between the concrete structure platform 8 and the upstream side of the second water retaining dam 5 is provided with an earth and rock backfill structure layer 9. The top of the earth and rock backfill structure layer 9, the upstream and downstream water-facing surfaces of the second water retaining dam 5, and the top surface of the second water retaining dam 5 are provided with an integral concrete panel 10, and the concrete panel 10 is connected to the concrete structure platform 8 as a whole. In this way, even if an excessive flood occurs, the flood can overflow the dam and enter the upper reservoir 1. After the concrete is hardened, the dam body will not be destroyed by the flood. Then the water entering the upper reservoir will be discharged through the water transmission and power generation system to ensure the safety of the project.

[0024] To prevent scouring and damage, a rock bottom protection structure 11 is provided at the bottom of the outlet 32 ​​of the culvert 3. To further improve the structural reliability of the outlet 32, an earth and rock backfill footing structure 12 is provided at the top of the outlet 32 ​​of the culvert 3 near the downstream dam surface of the first retaining dam 4.

Claims

1. A pumped storage power station upper reservoir arrangement structure, comprising a first retaining dam (4) arranged in a river channel, characterized in that: A second retaining dam (5) is provided on the upstream side of the first retaining dam (4), and an upper reservoir (1) is formed by the first retaining dam (4), the second retaining dam (5) and the mountain enclosures on both sides, and it is ensured that the first retaining dam (4) and the second retaining dam (5) are both located downstream of the important village (2). A discharge culvert (3) is pre-buried at the bottom of the upper reservoir (1), and the water inlet (31) of the discharge culvert (3) is provided in the river channel on the upstream side of the second retaining dam (5), and the water outlet (32) of the discharge culvert (3) is provided in the river channel on the downstream side of the first retaining dam (4); The top elevations of the first retaining dam (4) and the second retaining dam (5) are the same; A sand barrier (6) is provided at the bottom of the water inlet (31) of the drainage culvert (3); A trash rack (7) is provided in the water inlet (31) of the drainage culvert (3); The water inlet (31) of the discharge culvert (3) is arranged in the concrete structure platform (8), and the area between the concrete structure platform (8) and the upstream side of the second water retaining dam (5) is provided with an earth and rock backfill structure layer (9), and the top of the earth and rock backfill structure layer (9), the upstream and downstream water-facing surfaces of the second water retaining dam (5), and the top surface of the second water retaining dam (5) are provided with a concrete panel (10) of an integral structure, and the concrete panel (10) is connected to the concrete structure platform (8) to form a whole; A stone bottom protection structure (11) is provided at the bottom of the water outlet (32) of the drainage culvert (3); An earth and stone backfill footing structure (12) is provided at the top of the outlet (32) of the discharge culvert (3) in an area close to the downstream dam surface of the first retaining dam (4); The upper reservoir (1) is constructed in a half-cut and half-fill manner, and the discharge culvert (3) is an inverted siphon culvert.

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