Underground pumped storage power station arrangement structure

Abstract

The utility model provides an underground pumped storage power station arrangement structure. Comprising an overground reservoir, an upper pressure pipeline, an upper reversible water turbine, an upper plant, an upper reversible water turbine draft tube, a middle reservoir, a water inlet / outlet, a lower pressure pipeline, a lower reversible water turbine, a lower plant, a lower reversible water turbine draft tube, a lower reservoir, an upper main transformer and a lower main transformer, the large height difference between the upper reservoir and the lower reservoir of the underground pumped storage power station can be fully utilized, and the requirement for the capacity of the upper reservoir and the capacity of the lower reservoir is lowered; the underground pumped storage power station can select existing mature high-water-head reversible hydraulic turbine set equipment; the total construction cost of the power station is lower, according to preliminary calculation, the construction cost of the underground pumped storage power station with the total installed capacity of 1800 MW (4h energy storage) level or above can be reduced by about 1000 yuan per kilowatt after the technology of the patent is adopted, and the effect is remarkable.

Description

Technical Field

[0001] The utility model relates to the technical field of pumped storage, in particular to an underground pumped storage power station layout structure. Background Art

[0002] The energy storage capacity of a conventional pumped-storage power station is linearly related to the effective volume and height difference of the upper and lower reservoirs. When the height difference is constant, the greater the effective volume of the reservoir, the greater the storage capacity. When the effective volume of the reservoir is constant, the greater the height difference, the greater the storage capacity. The storage capacity is proportional to the product of the effective storage capacity of the upper and lower reservoirs and the height difference between the upper and lower reservoirs. The outstanding feature of an underground pumped-storage power station is that at least one reservoir is constructed by reconstructing an existing underground space or newly excavating an underground space. Its construction cost is higher than that of a reservoir surrounded by natural surface terrain. In order to reduce the construction cost of an underground pumped-storage power station, increasing the height difference between the upper and lower reservoirs is one of the effective technical approaches. However, if the height difference between the upper and lower reservoirs is too large, it is difficult to select mature and suitable reversible turbine equipment. The working head of the reversible turbine unit with current application performance does not exceed 800m. It is still difficult to apply a larger head to a reversible turbine. The present utility model is proposed to solve the above problem. Utility Model Content

[0003] The main purpose of the utility model is to change the conventional single-stage reversible turbine plant layout to a two-stage or multi-stage reversible turbine plant layout, so that a limited amount of water can be used for multiple power generation (turbine working condition) or electricity consumption (water pump working condition) through the multi-stage reversible turbine, and to make effective use of the large height difference between the upper and lower reservoirs by using the existing mature reversible turbine group equipment, thereby reducing the dependence on the storage capacity of the upper and lower reservoirs, and thus achieving the purpose of reducing the construction cost of the underground pumped storage power station.

[0004] In order to achieve the above-mentioned purpose, the utility model provides an underground pumped storage power station layout structure, including a surface upper reservoir, an upper reservoir water inlet and outlet, an upper pressure pipe, an upper reversible turbine, an upper powerhouse, an upper reversible turbine tailwater pipe, an intermediate reservoir, a water inlet and outlet from the intermediate reservoir to the upper powerhouse, a water inlet and outlet from the intermediate reservoir to the lower powerhouse, a lower pressure pipe, a lower reversible turbine, a lower powerhouse, a lower reversible turbine tailwater pipe, a lower reservoir water inlet and outlet, a lower reservoir, an upper main transformer, a lower main transformer, a ground switch station, power lines, an upper generator motor set and a lower generator motor set. This structure utilizes existing terrain or newly excavated construction of an underground pumped storage power station upper reservoir, and utilizes underground space such as abandoned underground tunnels. Occasionally, a new reservoir and a lower reservoir are artificially excavated and constructed; an upper reversible turbine unit and an upper generator motor unit are installed in an upper plant that is artificially excavated or renovated from an abandoned space; a lower reversible turbine unit and a lower generator motor unit are installed in a lower plant that is artificially excavated or renovated from an abandoned space; the upper reservoir is connected to the upper reversible turbine unit via an upper reservoir water inlet and outlet and an upper pressure pipe; water from the upper reservoir enters the upper pressure pipe via the upper reservoir water inlet and outlet, and then flows through the upper reversible turbine unit to perform work; the upper reversible turbine unit drives the upper generator motor unit to rotate and generate electricity; the generated electricity is boosted by an upper main transformer connected thereto and then transmitted to the power grid via a ground switch station and power lines;

[0005] The upper reversible turbine unit is connected to the middle reservoir through the upper reversible turbine tailwater pipe and the water inlet and outlet from the middle reservoir to the upper powerhouse. The water after the upper reversible turbine unit has done work enters the middle reservoir through the upper reversible turbine tailwater pipe and the water inlet and outlet from the middle reservoir to the upper powerhouse.

[0006] The intermediate reservoir is connected to the lower reversible hydraulic turbine unit through the water inlet and outlet leading to the lower powerhouse and the lower pressure pipe. Water from the intermediate reservoir enters the lower pressure pipe through the water inlet and outlet leading to the lower powerhouse, then flows through the lower reversible hydraulic turbine unit to perform work. The lower reversible hydraulic turbine unit drives the lower generator motor unit to rotate and generate electricity. The generated electricity is boosted by the lower main transformer connected thereto and then transmitted to the power grid via the ground switch station and power lines.

[0007] The lower reversible turbine unit is connected to the lower reservoir through the lower reversible turbine tailwater pipe and the lower reservoir inlet and outlet. The water after the lower reversible turbine unit does work enters the lower reservoir through the lower reversible turbine tailwater pipe and the lower reservoir inlet and outlet.

[0008] Compared with conventional technologies, the beneficial effects of the present invention are:

[0009] (1) The large height difference between the upper and lower reservoirs of the underground pumped storage power station can be fully utilized, reducing the demand for storage capacity of the upper and lower reservoirs;

[0010] (2) Underground pumped storage power stations can choose existing mature high-head reversible turbine equipment;

[0011] (3) The total cost of power station construction is lower. According to preliminary calculations, for underground pumped storage power stations with a total installed capacity of 1,800MW (4h energy storage) or above, the cost per kilowatt can be reduced by about RMB 1,000 after adopting this patented technology, which is a significant effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention is mainly conceived to be described in the form of a two-stage underground pumped storage power station.

[0013] Figure 1 : Schematic diagram of a two-stage underground pumped storage power station.

[0014] Among them, 1-surface reservoir, 2-water inlet and outlet of upper reservoir, 3-upper pressure pipe, 4-upper reversible turbine, 5-upper powerhouse, 6-upper reversible turbine tailwater pipe, 7-middle reservoir, 8-water inlet and outlet from middle reservoir to upper powerhouse, 9-water inlet and outlet from middle reservoir to lower powerhouse, 10-lower pressure pipe, 11-lower reversible turbine, 12-lower powerhouse, 13-lower reversible turbine tailwater pipe, 14-water inlet and outlet of lower reservoir, 15-lower reservoir, 16-upper main transformer, 17-lower main transformer, 18-ground switch station, 19-power line, 20-upper generator set, 21-lower generator set. DETAILED DESCRIPTION

[0015] The upper reservoir 1 in the drawings of the present invention is located on the surface, the middle reservoir 7 and the lower reservoir 15 are located underground, and the specific implementation method is as follows:

[0016] The upper reservoir 1 of the underground pumped storage power station is constructed by utilizing the existing terrain or newly excavated space, the middle reservoir 7 and the lower reservoir 15 are constructed by utilizing underground abandoned tunnels or artificially newly excavated space, the upper reversible turbine unit 4 and the upper generator motor unit 20 are installed in the upper plant building 5 that is artificially newly excavated or renovated from the abandoned space, and the lower reversible turbine unit 11 and the lower generator motor unit 21 are installed in the lower plant building 12 that is artificially newly excavated or renovated from the abandoned space.

[0017] When the power station needs to generate electricity externally, the power station enters the power generation mode. The water in the upper reservoir 1 enters the upper pressure pipe 3 through the upper reservoir inlet and outlet 2, and then flows through the upper reversible turbine unit 4 to generate power. The upper reversible turbine unit) drives the upper generator motor unit 20 to rotate and generate electricity. The generated electricity is boosted by the upper main transformer 16 and then sent to the power grid through the ground switch station 18 and power line 19. The water after the work of the upper reversible turbine unit 4 enters the upper reversible turbine tail water pipe 6 and the inlet and outlet 8 of the middle reservoir leading to the upper powerhouse. The water enters the middle reservoir 7, and enters the lower pressure pipe 10 through the water inlet and outlet 9 of the middle reservoir to the lower powerhouse, and then flows through the lower reversible turbine unit 11 to perform work. The lower reversible turbine unit 11 drives the lower generator motor unit 21 to rotate and generate electricity. The generated electricity is boosted by the lower main transformer 17 and then sent to the power grid through the ground switch station 18 and the power line 19. The water after performing work through the lower reversible turbine unit 11 enters the lower reservoir 15 through the lower reversible turbine tail water pipe 13 and the lower reservoir inlet and outlet 14.

[0018] When the grid has excess electricity, the pumped-storage power station can enter storage mode, absorbing the excess electricity from the grid. The water flow and current directions are opposite to those in power generation mode. In both power generation and storage modes, this system eliminates peak loads and fills valleys, smoothing out fluctuations in grid load.

Claims

1. An underground pumped storage power station layout structure, characterized in that: It includes the surface upper reservoir, the water inlet and outlet of the upper reservoir, the upper pressure pipe, the upper reversible turbine, the upper powerhouse, the upper reversible turbine tailwater pipe, the middle reservoir, the water inlet and outlet from the middle reservoir to the upper powerhouse, the water inlet and outlet from the middle reservoir to the lower powerhouse, the lower pressure pipe, the lower reversible turbine, the lower powerhouse, the lower reversible turbine tailwater pipe, the water inlet and outlet of the lower reservoir, the lower reservoir, the upper main transformer, the lower main transformer, the ground switch station, the power line, the upper generator motor unit and the lower generator motor unit. This structure utilizes the existing terrain or new excavation to construct the upper reservoir of the underground pumped storage power station, and utilizes the underground space of the abandoned underground tunnel or artificial new excavation to construct the middle reservoir and the lower reservoir. The upper reversible hydraulic turbine unit and the upper generator motor unit are installed in an upper powerhouse newly excavated or renovated from abandoned space, and the lower reversible hydraulic turbine unit and the lower generator motor unit are installed in a lower powerhouse newly excavated or renovated from abandoned space. The upper reservoir is connected to the upper reversible hydraulic turbine unit through the upper reservoir water inlet and outlet and the upper pressure pipe. The water of the upper reservoir enters the upper pressure pipe through the upper reservoir water inlet and outlet, and then flows through the upper reversible hydraulic turbine unit to perform work. The upper reversible hydraulic turbine unit drives the upper generator motor unit to rotate and generate electricity. The generated electricity is boosted by the upper main transformer connected to it and then sent to the power grid through the ground switch station and power lines. The upper reversible turbine unit is connected to the middle reservoir through the upper reversible turbine tailwater pipe and the water inlet and outlet from the middle reservoir to the upper powerhouse. The water after the upper reversible turbine unit has done work enters the middle reservoir through the upper reversible turbine tailwater pipe and the water inlet and outlet from the middle reservoir to the upper powerhouse. The intermediate reservoir is connected to the lower reversible hydraulic turbine unit through the water inlet and outlet leading to the lower powerhouse and the lower pressure pipe. Water from the intermediate reservoir enters the lower pressure pipe through the water inlet and outlet leading to the lower powerhouse, then flows through the lower reversible hydraulic turbine unit to perform work. The lower reversible hydraulic turbine unit drives the lower generator motor unit to rotate and generate electricity. The generated electricity is boosted by the lower main transformer connected thereto and then transmitted to the power grid via the ground switch station and power lines. The lower reversible turbine unit is connected to the lower reservoir through the lower reversible turbine tailwater pipe and the lower reservoir inlet and outlet. The water after the lower reversible turbine unit does work enters the lower reservoir through the lower reversible turbine tailwater pipe and the lower reservoir inlet and outlet.

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