CN217580026U

CN217580026U - Water-storage power station lower water reservoir arrangement structure utilizing existing reservoir

Info

Publication number: CN217580026U
Application number: CN202221571583.XU
Authority: CN
Inventors: 钟权; 王峰; 王勇胜; 龙军飞
Original assignee: PowerChina Chengdu Engineering Co Ltd
Current assignee: PowerChina Chengdu Engineering Co Ltd
Priority date: 2022-06-22
Filing date: 2022-06-22
Publication date: 2022-10-14
Anticipated expiration: 2032-06-22

Abstract

The utility model relates to an utilize reservoir arrangement structure under pumped storage power station of existing reservoir belongs to hydroelectric engineering technical field. The utility model discloses a water delivery power generation system's inlet outlet, existing reservoir and the ditch that is located existing reservoir upper reaches side are provided with the manger plate dam in a ditch, form the second reservoir at the upper reaches side of manger plate dam, and second reservoir and the water channel that existing reservoir set up through the level are linked together, are provided with the gate in the water channel, and water delivery power generation system's inlet outlet arranges in the second reservoir. The utility model discloses the manger plate of damming forms the second reservoir in the ditch of existing reservoir, and second reservoir initial stage retaining problem is solved to usable existing reservoir. During operation, when the water level of the existing reservoir is higher, the water level of the existing reservoir and the second reservoir are operated in a combined mode, so that a power generation water head can be increased; the system can independently operate when the water level of the existing reservoir is low, and the engineering requirements are met. Meanwhile, the conventional construction scheme is adopted during the period that the water level of the existing reservoir is low, so that the construction is convenient and reliable.

Description

Water-storage power station lower water reservoir arrangement structure utilizing existing reservoir

Technical Field

The utility model relates to an utilize reservoir arrangement structure under pumped storage power station of existing reservoir belongs to water and electricity engineering technical field.

Background

With the large-scale development of new energy such as wind power, photovoltaic and the like, a novel power system taking the new energy as a main body is gradually constructed, and the demand on a flexible power supply is more urgent. The pumped storage power station has the functions of peak regulation, frequency modulation and the like, can ensure the safety of a power system, and promotes the large-scale development and consumption of system energy.

Pumped storage power stations generally include upper and lower reservoirs, water delivery systems, power plants, and the like. The upper reservoir and the lower reservoir generally need the storage capacity of about several million or thousands of cubic meters, the operation of the power station is divided into a water pumping working condition and a power generation working condition, redundant power is pumped by a reversible water pumping and power generation dual-purpose unit in the power utilization valley, the water in the lower reservoir is pumped to the upper reservoir, and the water is discharged to generate power in the power utilization peak. When the pumped storage power station is arranged, the pumped storage power station is often influenced by factors such as topographic and geological conditions, environmental protection, immigration and the like. The existing reservoir is generally preferred for the lower reservoir, and the project investment can be reduced because a water retaining and releasing structure is not required to be additionally built. However, under the influence of the operation and scheduling of the existing reservoir, the reservoir water level falling depth may reach tens of meters, which makes the water inlet and outlet of the newly-built pumped storage power station require dry land construction to face a great challenge, and the conventional modes of filling cofferdams, blocking water or reserving rock plugs and the like are all restricted to a certain extent.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is: the lower reservoir arrangement structure of the pumped storage power station utilizing the existing reservoir can effectively utilize the existing reservoir and is convenient to construct.

For solving the technical problem the utility model discloses the technical scheme who adopts is: the lower reservoir arrangement structure of the pumped storage power station utilizing the existing reservoir comprises a water inlet and a water outlet of a water delivery power generation system, the existing reservoir and a branch trench positioned on the upstream side of the existing reservoir, wherein a water retaining dam is arranged in the branch trench, a second reservoir is formed on the upstream side of the water retaining dam, the second reservoir is communicated with the existing reservoir through a water passing channel which is horizontally arranged, a gate is arranged in the water passing channel, and the water inlet and the water outlet of the water delivery power generation system are arranged in the second reservoir.

Further, the method comprises the following steps: the water passing channel is a limber hole arranged in the water retaining dam.

Further, the method comprises the following steps: the water channel is a connecting tunnel arranged on the side of the branch trench.

Further, the method comprises the following steps: the dead water level of the second reservoir is higher than that of the existing reservoir, and the elevation of the gate sill is lower than that of the second reservoir.

The utility model has the advantages that: in the construction period, when the water level of the existing reservoir is close to the dead water level, permanent buildings such as a retaining dam, a water inlet and a water outlet can be built (or a construction retaining cofferdam is built, and the permanent buildings such as the retaining dam, the water inlet and the water outlet are built under the enclosure of the cofferdam), so that the water inlet and the water outlet are prevented from being built below the dead water level of the existing reservoir (the construction difficulty is high).

And in the operation period, when the water level of the existing reservoir is higher than the dead water level of the second reservoir, the gate in the water passage is opened, the second reservoir is communicated with the existing reservoir, at the moment, the second reservoir and the existing reservoir are combined to serve the operation of the pumped storage power station, the water level of the second reservoir is lower than the normal water storage level of the second reservoir, the available power generation water head is increased, and the power generation benefit is increased. When the water level of the existing reservoir is close to (still higher than) the dead water level of the second reservoir, after the pumping working condition is finished, the gate in the water passage is closed, the second reservoir is not communicated with the existing reservoir, and at the moment, the second reservoir is an independent lower reservoir of the pumped storage power station and can meet the engineering requirement.

The utility model discloses the manger plate of damming forms the second reservoir in the ditch of existing reservoir, and second reservoir initial stage retaining problem is solved to usable existing reservoir. During operation, the system and the second reservoir are operated in a combined mode when the water level of the existing reservoir is high, so that a generating head can be increased; the system can be operated independently when the water level of the existing reservoir is low, and the engineering requirements are met. Meanwhile, the conventional construction scheme is adopted during the period that the water level of the existing reservoir is low, and the construction is convenient and reliable.

Drawings

Fig. 1 is a schematic plan view of a first embodiment of the present invention.

Fig. 2 is a schematic elevation view of a first embodiment of the present invention.

Fig. 3 is a schematic plan view of a second embodiment of the present invention.

Fig. 4 is a schematic elevation view of a second embodiment of the present invention.

The labels in the figure are: 1-an existing reservoir, 2-branch ditches, 3-retaining dams, 4-a second reservoir, 5-limbers, 6-connecting tunnels, 7-gates, 8-a water delivery and power generation system, 9-water inlets and outlets, 10-ground lines, 101-an existing reservoir dead water level, 102-an existing reservoir normal water storage level, 103-a second reservoir normal water storage level and 104-a second reservoir dead water level.

Detailed Description

For the purpose of facilitating understanding and practicing the invention, preferred embodiments of the invention are further described with reference to the accompanying drawings.

As shown in fig. 1 to 4, the utility model discloses a water inlet and outlet 9 of water power generation system 8, existing reservoir 1 and the branch ditch 2 that is located 1 upstream side of existing reservoir are provided with retaining dam 3 in branch ditch 2, form second reservoir 4 in retaining dam 3's upstream side, the effective reservoir capacity of second reservoir 4 can satisfy the engineering needs, second reservoir 4 and existing reservoir 1 are linked together through the water channel of level setting, be provided with gate 7 in the water channel, water power generation system 8's water inlet and outlet 9 arranges in second reservoir 4. The water passage can be a limber hole 5 arranged in the retaining dam 3 (see fig. 1 and 2) or a connecting tunnel 6 arranged along the side of the branch trench 2 (see fig. 3 and 4).

When the method is implemented, the second reservoir 4 and the existing reservoir 1 respectively have corresponding normal water storage level and dead water level according to the comprehensive consideration of the operating characteristics of the two reservoirs, rainfall, flood and the like. Preferably, the normal storage level 103 of the second reservoir is higher than the normal storage level 102 of the existing reservoir (because the pumped storage power station needs a certain effective storage capacity, the effective storage capacity below the normal storage level 102 of the existing reservoir may not be enough within the range of the branch trench 2), and the dead water level 104 of the second reservoir is higher than the dead water level 101 of the existing reservoir (because the second reservoir 4 is built in the branch trench 2, the ground level is higher than that of the existing reservoir 1, in this case, because the dead water level 104 of the second reservoir is higher than the dead water level 101 of the existing reservoir, the connecting tunnel 6 also has the functions of emptying and flushing sand). In order to control the reservoir water level, the height of the bottom sill of the gate 7 should be lower than the dead water level of the second reservoir 4 (i.e. the dead water level 104 of the second reservoir shown in the figure), and the specific lower height can be calculated according to hydraulics to ensure that enough reference flow exists.

In the construction period, when the water level of the existing reservoir 1 is close to the dead water level, permanent buildings such as the water retaining dam 3, the water inlet and the water outlet 9 and the like can be built (under the condition of no direct construction, the construction water retaining cofferdam can be built, and the permanent buildings such as the water retaining dam 3, the water inlet and the water outlet 9 and the like are built under the enclosure of the cofferdam), so that the water inlet and the water outlet 9 are prevented from being built below the dead water level 101 of the existing reservoir (the construction difficulty is large).

In the operation period, when the water level of the existing reservoir 1 is higher than the dead water level 104 of the second reservoir, the gate 7 in the water passing channel is opened, the second reservoir 4 is communicated with the existing reservoir 1, at the moment, the second reservoir 4 and the existing reservoir 1 are combined to serve the operation of the pumped storage power station, the actual water level of the second reservoir is lower than the normal water storage level 103 of the second reservoir, the available generating head is increased, and the generating benefit is increased. When the water level of the existing reservoir 1 is close to (still higher than) the dead water level 104 of the second reservoir, after the pumping working condition is finished, the gate 7 in the water passage is closed, the second reservoir 4 is not communicated with the existing reservoir 1, and at the moment, the second reservoir 4 is an independent lower reservoir of the pumped storage power station and can meet the engineering requirements.

Claims

1. Utilize reservoir arrangement structure under pumped storage power station of existing reservoir, including inlet outlet (9) of water transmission power generation system (8), existing reservoir (1) and branch ditch (2) that are located existing reservoir (1) upstream side, its characterized in that: the branch ditch (2) is internally provided with a water retaining dam (3), a second reservoir (4) is formed at the upstream side of the water retaining dam (3), the second reservoir (4) is communicated with the existing reservoir (1) through a water passing channel which is horizontally arranged, a gate (7) is arranged in the water passing channel, and a water inlet and a water outlet (9) of a water transmission and power generation system (8) are arranged in the second reservoir (4).

2. The underdrain arrangement of pumped-storage power stations using existing reservoirs of claim 1, wherein: the water passing channel is a limber hole (5) arranged in the retaining dam (3).

3. The underdrain arrangement of pumped-storage power stations using existing reservoirs of claim 1, wherein: the water channel is a connecting tunnel (6) arranged along the shore of the branch trench (2).

4. The pumped-storage power station underdrain arrangement utilizing existing reservoirs of any of claims 1 to 3, wherein: the dead water level of the second reservoir (4) is higher than that of the existing reservoir (1), and the elevation of the bottom sill of the gate (7) is lower than that of the second reservoir (4).