Comprehensive energy system integrating geothermal energy and pumped storage power stations and operation method of comprehensive energy system

Abstract

The invention provides a comprehensive energy system integrating geothermal energy and a pumped storage power station, which comprises a pumped storage power station system and a mid-deep geothermal energy system, the pumped storage power station system comprises a water delivery system valve, an upper reservoir and a lower reservoir, an underground powerhouse is arranged between the upper reservoir and the lower reservoir, a first water delivery system is connected between the upper reservoir and the underground powerhouse, and a second water delivery system is connected between the middle-deep geothermal energy system and the middle-deep geothermal energy system. A second water conveying system is connected between the lower reservoir and the underground powerhouse, an integrated connection switch system is connected between the middle-deep layer geothermal energy system and the underground powerhouse, the integrated connection switch system comprises a water connection valve, and the middle-deep layer geothermal energy system comprises a plurality of coaxial heat exchangers. The upper reservoir and the lower reservoir in the pumped storage power station system have a certain water head height difference, are used for converting electric energy and potential energy, can be combined with a medium-deep geothermal energy system, drive water circulation in the coaxial heat exchanger by means of the water head height difference, convert the potential energy into heat energy, save electric power required by water circulation and realize effective energy complementation and cooperative utilization.

Description

Technical Field

[0001] The present invention relates to the technical field of energy utilization and energy storage, and particularly to an integrated energy system integrating geothermal energy and pumped-storage power stations. Background Art

[0002] As an important energy storage facility in the power system, the pumped-storage power station system uses an electric pump to pump water from a lower place to a higher place for energy storage, and releases the water flow to drive a generator to generate electricity during peak demand periods, realizing the conversion between potential energy and electric energy. With its advantages such as large capacity, long life, and flexible regulation, it plays an irreplaceable role in peak shaving and valley filling, frequency modulation and phase modulation, etc. However, the construction cost of the pumped-storage power station system is high, and there are special requirements for geographical locations, usually requiring construction on terrains with a certain height difference.

[0003] As a clean, stable and rich in reserves form of renewable energy, medium-deep geothermal energy can realize heating by using a coaxial casing system to conduct heat exchange between the fluid in the heat exchanger and the underground rock and soil, achieving an environmentally friendly geothermal energy development method of "extracting heat without extracting water". However, the development of geothermal energy is restricted by geological conditions, and there are risks of difficult reinjection and depletion of geothermal resources in traditional hydrothermal geothermal energy development.

[0004] When developing traditional energy utilization and energy storage projects, the pumped-storage power station system and the geothermal heating system often operate as independent projects respectively, and fail to fully achieve effective energy complementarity and collaborative utilization. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art, and provide an integrated energy system integrating geothermal energy and pumped-storage power stations, which can solve the problem that the pumped-storage power station system and the geothermal heating system often operate as independent projects respectively, and fail to fully achieve effective energy complementarity and collaborative utilization.

[0006] For this purpose, the present invention adopts the following technical solutions: An integrated energy system integrating geothermal energy and pumped-storage power stations, comprising a pumped-storage power station system provided on a mountain body and a medium-deep geothermal energy system provided in underground rock and soil. The pumped-storage power station system includes a water conveyance system valve, an upper reservoir located at the top of the mountain body, and a lower reservoir located at the bottom of the mountain body. An underground powerhouse is provided between the upper reservoir and the lower reservoir. A first water conveyance system is connected between the upper reservoir and the underground powerhouse, and a second water conveyance system is connected between the lower reservoir and the underground powerhouse. An integrated connection switch system is connected between the medium-deep geothermal energy system and the underground powerhouse. The integrated connection switch system includes a water connection valve, and the medium-deep geothermal energy system includes a plurality of coaxial heat exchangers.

[0007] On the basis of adopting the above technical solutions, the present invention can also adopt the following further technical solutions, or use these further technical solutions in combination: The underground power plant includes a pumped-storage unit, a geothermal energy system unit, and a general control room. The general control room controls the pumped-storage unit and the geothermal energy system unit. The general control room is also connected to and controls the power system and the heating system.

[0008] The coaxial heat exchanger includes a closed base at the bottom. A heat exchanger outer pipe is provided on the peripheral side of the closed base. A ring of well cement wall is provided on the outside of the heat exchanger outer pipe. An inlet and outlet exchanger is provided on the upper surface of the closed base. A number of exchange holes are provided on the inlet and outlet exchanger. A heat exchanger inner pipe is also provided on the inlet and outlet exchanger. The heat exchanger inner pipe is located inside the heat exchanger outer pipe. The heat exchanger inner pipe and the heat exchanger outer pipe are communicated through the exchange holes of the inlet and outlet exchanger. A closed annular space is formed inside the heat exchanger inner pipe and the heat exchanger outer pipe. The heat exchanger inner pipe is communicated with the water pipe in the integrated connection switch system through a connecting pipe.

[0009] The heat exchanger outer pipe is made of a material with good heat conduction performance.

[0010] The heat exchanger inner pipe is made of a material with good heat insulation performance.

[0011] The object of the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a comprehensive energy system integrating geothermal energy and pumped-storage power stations, which can solve the problem that the pumped-storage power station system and the geothermal heating system often operate independently as separate projects and fail to fully realize effective energy complementarity and collaborative utilization.

[0012] For this reason, the present invention also adopts the following technical solutions: An operation method of a comprehensive energy system integrating geothermal energy and pumped-storage power stations includes an operation method during low power load and an operation method during high power load. During low power load, the redundant electric energy in the power system is respectively connected to the pumped-storage power station system and the deep geothermal energy system. The pumped-storage power station system and the deep geothermal energy system operate independently. Through the pumped-storage power station system and the underground power plant, the redundant electric energy is converted into the potential energy of water for storage, and through the deep geothermal energy system and the underground power plant, the redundant electric energy is converted into heat energy for building heating. During high power load, the pumped-storage power station system can supply energy to the deep geothermal energy system. The potential energy of water in the pumped-storage power station system can be directly converted into electric energy through the underground power plant and transmitted to the power system. It can also convert the potential energy of water in the pumped-storage power station system into the heat energy of the deep geothermal energy system through the underground power plant.

[0013] On the basis of adopting the above technical solution, the present invention can also adopt the following further technical solutions, or use these further technical solutions in combination: During the low valley period of power load, the redundant electric energy in the power system is connected to the pumped-storage power station system. The valves of the water conveyance system are opened, and the pumped-storage units are controlled through the general control room in the underground power house. The water in the lower reservoir is pumped to the upper reservoir through the second water conveyance system and the first water conveyance system, and the redundant electric energy is converted into the potential energy of water for storage; the redundant electric energy in the power system is connected to the medium-deep geothermal energy system. The water connection valve connecting the pumped-storage power station system in the integrated connection switch system is closed, and the geothermal energy system units are controlled through the general control room in the underground power house. The electric energy is used to drive the water circulation in the coaxial heat exchanger, absorb the heat in the underground rock and soil mass, and convey it upward to the heating system connected to the underground power house to supply heating for the buildings with heating requirements nearby, and the redundant electric energy is converted into heat energy.

[0014] During the peak period of power load, for the pumped-storage power station system, the valves of the water conveyance system are opened, and the pumped-storage units are controlled through the general control room in the underground power house. The water in the upper reservoir is conveyed to the pumped-storage units in the underground power house through the first water conveyance system for power generation, and the potential energy of water is converted into electric energy by the pumped-storage units in the underground power house and conveyed to the power system; for the medium-deep geothermal energy system, if the elevation difference of the mountain is large and the water head is high, the water connection valve connecting the pumped-storage power station system in the integrated connection switch system is opened, and the geothermal energy system units are controlled through the general control room in the underground power house. The water released from the upper reservoir is used to drive the water circulation in the coaxial heat exchanger, absorb the heat in the underground rock and soil mass, and convey it upward to the heating system connected to the underground power house, directly converting the potential energy of water into heat energy to supply heating for the buildings with heating requirements nearby. If the elevation difference of the mountain is small and the water head is small, the electric energy converted by the pumped-storage units is used as an auxiliary to jointly drive the water circulation in the coaxial heat exchanger with the potential energy of water, absorb the heat in the underground rock and soil mass, and convey it upward to the heating system connected to the underground power house, realizing the conversion of potential energy, electric energy and heat energy.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects: The upper reservoir and the lower reservoir in the pumped-storage power station system have a certain head difference for the conversion of electric energy and potential energy. It can be combined with the medium-deep geothermal energy system, drive the water circulation in the coaxial heat exchanger by means of the head difference, use the potential energy to convert heat energy, save the electric power required for water circulation, and the potential energy can also be directly converted into electric energy. The redundant electric energy can directly drive the circulating water heating of the geothermal system. The integrated energy system can not only store and regulate electric energy, but also provide heat energy, realizing effective energy complementarity and collaborative utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the system structure of the present invention.

[0017] Figure 2 This is a schematic structural diagram of the coaxial heat exchanger of the present invention. Detailed implementation manners

[0018] In order to enable those skilled in the art to better understand the technical solution of the present invention, the preferred implementation manners of the present invention will be described below in conjunction with specific embodiments. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals represent the same or similar functional elements from beginning to end. However, it should be understood that the drawings are only for illustrative purposes and cannot be construed as a limitation on the present invention; in order to better illustrate this embodiment, some components in the drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted, and the positional relationships described in the drawings are only for illustrative purposes and cannot be construed as a limitation on the present invention.

[0019] The present invention will be further described below in conjunction with the drawings and embodiments, but it is not used as a basis for limiting the present invention.

[0020] The integrated geothermal and pumped-storage power station comprehensive energy system provided by the present invention includes a pumped-storage power station system 1 provided on a mountain body 5 and a medium-deep geothermal energy system 2 provided in an underground rock and soil body 10. The pumped-storage power station system 1 includes a water conveyance system valve, an upper reservoir 3 located at the top of the mountain body 5, and a lower reservoir 8 located at the bottom of the mountain body 5. An underground powerhouse 6 is provided between the upper reservoir 3 and the lower reservoir 8. A first water conveyance system 4 is connected between the upper reservoir 3 and the underground powerhouse 6, and a second water conveyance system 7 is connected between the lower reservoir 8 and the underground powerhouse 6. An integrated connection switch system 9 is connected between the medium-deep geothermal energy system 2 and the underground powerhouse 6. The integrated connection switch system 9 includes a water connection valve. The medium-deep geothermal energy system 2 includes a number of coaxial heat exchangers 11.

[0021] Both the first water conveyance system 4 and the second water conveyance system 7 are located inside the mountain body 5. The first water conveyance system 4 is used for water conveyance between the upper reservoir and the underground powerhouse during the pumping / discharging process, and the second water conveyance system 7 is used for water conveyance between the lower reservoir and the underground powerhouse during the pumping / discharging process.

[0022] The underground powerhouse 6 includes a pumped-storage unit, a geothermal energy system unit and a general control room. The general control room controls the pumped-storage unit and the geothermal energy system unit, and the general control room is also connected to and controls the power system and the heating system.

[0023] The integrated connection switch system 9 connects the pumped-storage power station system 1 and the medium-deep geothermal energy system 2, and includes devices such as water pipes and cables. The water pipe is used to input the high-pressure water when the pumped-storage power station system 1 discharges water into the coaxial heat exchanger 11 to drive the water circulation by means of the head difference, and is connected to the general control room in the underground powerhouse 6.

[0024] The underground powerhouse 6 is built within the mountain body 5, which can avoid hillside collapses, is not affected by climate changes, and preserves the ground landscape.

[0025] Among them, the pumped-storage units are used to control the water cycle and generate electricity when pumping water from the lower reservoir to the upper reservoir and discharging water from the upper reservoir to the lower reservoir. The geothermal system units are used to control the water cycle in the coaxial heat exchanger 11 and the transmission of geothermal energy.

[0026] The coaxial heat exchanger 11 includes a closed base 116 located at the bottom. The outer pipe 112 of the heat exchanger is provided on the peripheral side of the closed base 116. A ring of well cement wall 113 is provided outside the outer pipe 112 of the heat exchanger. An inlet and outlet water exchanger 114 is provided on the upper surface of the closed base 116. A number of exchange holes 115 are provided on the inlet and outlet water exchanger 114 to improve the heat exchange efficiency of water. An inner pipe 111 of the heat exchanger is also provided on the inlet and outlet water exchanger 114. The inner pipe 111 of the heat exchanger is located inside the outer pipe 112 of the heat exchanger. The inner pipe 111 and the outer pipe 112 of the heat exchanger are connected through the exchange holes 115 of the inlet and outlet water exchanger 114. A closed annular space is formed inside the inner pipe 111 and the outer pipe 112 of the heat exchanger for the circulation of water and the absorption of heat. The inner pipe 111 of the heat exchanger is connected to the water pipe in the integrated connection switch system 9 through a connecting pipe.

[0027] The coaxial heat exchanger 11 extracts heat from the underground rock and soil mass only through the internal circulating water, taking heat without taking water, and will not cause problems such as groundwater pollution and ground settlement.

[0028] The temperature of the underground rock and soil mass 10 increases with depth and can provide heat for the coaxial heat exchanger 11.

[0029] The outer pipe 112 of the heat exchanger is made of a material with good thermal conductivity and serves as a channel for heat exchange between the water inside the heat exchanger and the underground rock and soil mass 10.

[0030] The inner pipe 111 of the heat exchanger is made of a material with good heat insulation performance and is used to transport the hot water that absorbs the heat of the underground rock and soil mass 10 to the underground powerhouse 6.

[0031] The closed base 116 is used to enclose the bottom of the outer pipe 112 of the heat exchanger and provide support for the inner pipe 111 and the inlet and outlet water exchanger 114.

[0032] The well cement wall 113 is injected between the casing and the well wall after the drilling construction is completed and the casing is lowered, playing the role of well cementing and improving the heat exchange performance.

[0033] The coaxial heat exchanger 11 is located in the underground rock and soil mass 10 and is in a vertical shape. The number of coaxial heat exchangers 11 is set according to the heating requirements of the underground powerhouse 6, the power station camp, and nearby buildings.

[0034] During use, it is necessary to monitor the water temperature and pressure in the coaxial heat exchanger 11 to ensure the safe and efficient operation of the system.

[0035] After the heating season ends, the geothermal energy absorbed in the coaxial heat exchanger 11 of the medium-deep geothermal energy system 2 is stored in the underground rock and soil mass 10 for use in the next heating season.

[0036] In this embodiment, the pumped-storage power station system 1 serves as an energy storage device and a peak shaving tool for the power grid. During the low power load period, the water in the lower reservoir 8 located at a lower elevation is pumped to the upper reservoir 3 at a higher elevation by the excess power, and the pumped-storage power station system 1 converts the excess electrical energy into the potential energy of water, which is used for power generation by releasing water during the high power load period, reducing the waste of energy during the low power load period of the power grid and preparing for power supply during the peak period. At the same time, the excess power is used to drive the medium-deep geothermal energy system 2 to convert heat energy; during the high power load period, the potential energy of the water in the upper reservoir 3 is converted into electrical energy. The water in the upper reservoir 3 can also directly drive the medium-deep geothermal energy system 2 to convert heat energy through the water pipe of the integrated connection switch system 9. When the elevation difference of the upper reservoir 3 is insufficient, the converted electrical energy is used to drive the medium-deep geothermal energy system 2 to convert heat energy, achieving effective energy complementarity and collaborative utilization.

[0037] The operation method of the integrated energy system integrating geothermal energy and a pumped-storage power station provided by the present invention includes the operation method during the low power load period and the operation method during the high power load period; during the low power load period, the excess electrical energy in the power system is respectively connected to the pumped-storage power station system 1 and the deep geothermal energy system 2. The pumped-storage power station system 1 and the deep geothermal energy system 2 operate independently. The excess electrical energy is converted into the potential energy of water and stored through the pumped-storage power station system 1 and the underground power house 6, and the excess electrical energy is converted into heat energy and supplied for building heating through the deep geothermal energy system 2 and the underground power house 6; during the high power load period, the pumped-storage power station system 1 can supply energy to the deep geothermal energy system 2. The potential energy of the water in the pumped-storage power station system 1 can be directly converted into electrical energy through the underground power house 6 and transmitted to the power system, and the potential energy of the water in the pumped-storage power station system 1 can also be converted into the heat energy of the deep geothermal energy system 2 through the underground power house 6.

[0038] During the low load period of the power system, the excess electric energy in the power system is connected to the pumped-storage power station system 1. The valves of the water conveyance system are opened, and the pumped-storage units are controlled through the general control room in the underground powerhouse 6. The water in the lower reservoir 8 is pumped through the second water conveyance system 7 and the first water conveyance system 4 to the upper reservoir 3, converting the excess electric energy into the potential energy of water for storage. The excess electric energy in the power system is connected to the medium-deep geothermal energy system 2. The water connection valve connecting to the pumped-storage power station system 1 in the integrated connection switch system 9 is closed, and the geothermal energy system units are controlled through the general control room in the underground powerhouse 6. The electric energy is used to drive the water circulation in the coaxial heat exchanger 11, absorb the heat in the underground rock and soil mass 10, and convey it upward to the heating system connected to the underground powerhouse 6 to supply heating for the buildings with heating requirements nearby, converting the excess electric energy into heat energy.

[0039] During the high load period of the power system, for the pumped-storage power station system 1, the valves of the water conveyance system are opened, and the pumped-storage units are controlled through the general control room in the underground powerhouse 6. The water in the upper reservoir 3 is conveyed through the first water conveyance system 4 to the pumped-storage units in the underground powerhouse 6 for power generation, and the potential energy of water is converted into electric energy by the pumped-storage units in the underground powerhouse 6 and then conveyed to the power system. For the medium-deep geothermal energy system 2, if the height difference of the mountain body 5 is large and the water head is high, the water connection valve connecting to the pumped-storage power station system 1 in the integrated connection switch system 9 is opened, and the geothermal energy system units are controlled through the general control room in the underground powerhouse 6. The water released from the upper reservoir 3 (the water head difference during water release) is used to drive the water circulation in the coaxial heat exchanger 11, absorb the heat in the underground rock and soil mass 10, and convey it upward to the heating system connected to the underground powerhouse 6, directly converting the potential energy of water into heat energy to supply heating for the buildings with heating requirements nearby. If the height difference of the mountain body 5 is small and the water head is low, the electric energy converted by the pumped-storage units is used as an auxiliary to jointly drive the water circulation in the coaxial heat exchanger 11 with the potential energy of water, absorb the heat in the underground rock and soil mass 10, and convey it upward to the heating system connected to the underground powerhouse 6 to achieve the conversion of potential energy, electric energy and heat energy.

[0040] Based on the description and drawings of the present invention, those skilled in the art can easily manufacture or use the integrated energy system of geothermal energy and pumped-storage power station of the present invention, and can produce the positive effects recorded in the present invention.

[0041] It should be noted that the terms "comprising", "having" and any variations thereof in the description, claims and above-mentioned drawings of the present invention are intended to cover non-exclusive inclusion. The terms "mounted", "arranged", "provided with", "connected", "coupled", "socketed" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral structure; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, or there may be internal communication between two mechanisms, components or parts. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "one end", "the other end", "outer side", "inner side", "horizontal", "end portion", "length", "outer end", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated mechanism or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention. The terms "first" and "second" are also used only for the sake of brevity in description, and do not indicate or imply relative importance.

[0043] In addition, when practicing the claims of the present invention, those skilled in the art can understand and affect the variations of the disclosed embodiments through the study of the drawings, the disclosure and the appended claims. In addition, in the claims and the description, words such as "comprising", "containing", etc. do not exclude other elements or steps, and non-plural nouns do not exclude their plural forms.

[0044] The above are only the preferred embodiments of the present invention, and are not used to limit the scope of implementation of the present invention. That is, all equivalent changes and modifications made in accordance with the present invention are covered by the scope of the claims of the present invention, and no further examples are given here.

Claims

1. An integrated energy system integrating geothermal energy and pumped-storage power stations, characterized in that, It includes a pumped-storage power station system (1) installed on a mountain body (5) and a medium-deep geothermal energy system (2) installed in an underground rock and soil mass (10). The pumped-storage power station system (1) includes a water conveyance system valve, an upper reservoir (3) located at the top of the mountain body (5), and a lower reservoir (8) located at the bottom of the mountain body (5). An underground powerhouse (6) is provided between the upper reservoir (3) and the lower reservoir (8). A first water conveyance system (4) is connected between the upper reservoir (3) and the underground powerhouse (6), and a second water conveyance system (7) is connected between the lower reservoir (8) and the underground powerhouse (6). An integrated connection and switch system (9) is connected between the medium-deep geothermal energy system (2) and the underground powerhouse (6). The integrated connection and switch system (9) includes a water connection valve. The medium-deep geothermal energy system (2) includes a number of coaxial heat exchangers (11).

2. The integrated geothermal and pumped-storage power station comprehensive energy system according to claim 1, characterized in that, The underground powerhouse (6) includes a pumped-storage unit, a geothermal energy system unit, and a general control room. The general control room controls the pumped-storage unit and the geothermal energy system unit. The general control room is also connected to and controls the power system and the heating system.

3. The integrated geothermal and pumped-storage power station comprehensive energy system according to claim 1, characterized in that The coaxial heat exchanger (11) includes a closed base (116) located at the bottom. A heat exchanger outer tube (112) is provided on the periphery of the closed base (116). A ring of well cement wall (113) is provided on the outside of the heat exchanger outer tube (112). An inlet and outlet water exchanger (114) is provided on the top of the closed base (116). A number of exchange holes (115) are provided on the inlet and outlet water exchanger (114). A heat exchanger inner tube (111) is also provided on the inlet and outlet water exchanger (114). The heat exchanger inner tube (111) is located inside the heat exchanger outer tube (112). The heat exchanger inner tube (111) and the heat exchanger outer tube (112) are connected through the exchange holes (115) of the inlet and outlet water exchanger (114). A closed annular space is formed inside the heat exchanger inner tube (111) and the heat exchanger outer tube (112). The heat exchanger inner tube (111) is connected to the water pipe in the integrated connection and switch system (9) through a connecting pipe.

4. The integrated energy system integrating geothermal energy and pumped storage power station according to claim 3, characterized in that, The heat exchanger outer tube (112) is made of a material with good heat conduction performance.

5. The integrated geothermal and pumped-storage power station comprehensive energy system according to claim 3, characterized in that, The heat exchanger inner tube (111) is made of a material with good heat insulation performance.

6. Operation method of an integrated energy system integrating geothermal energy and pumped-storage power stations, characterized in that, It includes an operation method during low power load periods and an operation method during high power load periods; during low power load periods, the excess electric energy in the power system is connected to the pumped-storage power station system (1) and the deep geothermal energy system (2) respectively. The pumped-storage power station system (1) and the deep geothermal energy system (2) operate independently. The excess electric energy is converted into the potential energy of water and stored through the pumped-storage power station system (1) and the underground power house (6), and the excess electric energy is converted into heat energy to supply building heating through the deep geothermal energy system (2) and the underground power house (6); during high power load periods, the pumped-storage power station system (1) can supply energy to the deep geothermal energy system (2). The potential energy of the water in the pumped-storage power station system (1) can be directly converted into electric energy through the underground power house (6) and transmitted to the power system. The potential energy of the water in the pumped-storage power station system (1) can also be converted into the heat energy of the deep geothermal energy system (2) through the underground power house (6).

7. The operation method of the integrated geothermal and pumped storage power station comprehensive energy system according to claim 6, characterized in that, During low power load periods, the excess electric energy in the power system is connected to the pumped-storage power station system (1). The water conveyance system valve is opened, and the pumped-storage units are controlled through the master control room in the underground power house (6). The water in the lower reservoir (8) is pumped through the second water conveyance system (7) and the first water conveyance system (4) to the upper reservoir (3), converting the excess electric energy into the potential energy of water for storage; the excess electric energy in the power system is connected to the medium-deep geothermal energy system (2). The water connection valve connected to the pumped-storage power station system (1) in the integrated connection switch system (9) is closed, and the geothermal energy system units are controlled through the master control room in the underground power house (6). The water circulation in the coaxial heat exchanger (11) is driven by electric energy to absorb the heat in the underground rock and soil mass (10) and convey it upward to the heating system connected to the underground power house (6) to supply heating for buildings with heating requirements nearby, converting the excess electric energy into heat energy.

8. The operation method of the integrated geothermal and pumped-storage power station comprehensive energy system according to claim 6, characterized in that, During the peak power load, for the pumped-storage power station system (1), open the valves of the water conveyance system, control the pumped-storage units through the general control room in the underground powerhouse (6), and convey the water in the upper reservoir (3) to the pumped-storage units in the underground powerhouse (6) through the first water conveyance system (4) for power generation. The potential energy of the water is converted into electrical energy by the pumped-storage units in the underground powerhouse (6) and transmitted to the power system. For the medium-deep geothermal energy system (2), if the elevation difference of the mountain body (5) is large and the water head is high, open the water connection valve connected to the pumped-storage power station system (1) in the integrated connection switch system (9), control the geothermal energy system units through the general control room in the underground powerhouse (6), use the water released from the upper reservoir (3) to drive the water circulation in the coaxial heat exchanger (11), absorb the heat in the underground rock and soil mass (10), and convey it upward to the heating system connected to the underground powerhouse (6), directly converting the potential energy of the water into heat energy to supply heating for the buildings with heating requirements nearby. If the elevation difference of the mountain body (5) is small and the water head is small, use the electrical energy converted by the pumped-storage units as an auxiliary, and jointly drive the water circulation in the coaxial heat exchanger (11) with the potential energy of the water, absorb the heat in the underground rock and soil mass (10), and convey it upward to the heating system connected to the underground powerhouse (6), realizing the conversion of potential energy, electrical energy and heat energy.

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