Mountain gravity energy storage system

Abstract

The utility model discloses a mountain gravity energy storage system which comprises a water pumping system, a gravity conveying system and an energy storage assembly. The water pumping system comprises a first reservoir, a second reservoir and a first reversible unit. The first reservoir and the second reservoir are communicated through a first auxiliary pool, a connecting pipeline and a second auxiliary pool. The gravity conveying system comprises a conveying rail used for bearing a gravity block, a first storage bin and a second storage bin. The gravity conveying system further comprises a second reversible unit, the second reversible unit drives the gravity block to ascend in the driving mode, and the second reversible unit generates power through the descending potential energy of the gravity block in the power generation mode. By arranging the water pumping system and the gravity conveying system, in the electricity trough period, it is guaranteed that the mountain gravity energy storage system can fully utilize electric energy and conduct gravity energy storage; and in the peak period of power utilization, the first reversible unit and the second reversible unit are driven to generate power, so that the power supply requirement is met, and the stability and the energy storage efficiency of the mountain gravity energy storage system are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage and power generation, in particular to a mountain gravity energy storage system. Background Art

[0002] Electric energy storage includes mechanical energy storage, electrochemical energy storage, electromagnetic energy storage, thermal energy storage, chemical energy storage and other methods. The most common electrochemical energy storage is to use a large number of batteries for charging and discharging, while mechanical energy storage includes more common pumped storage, gravity storage and compressed air storage. Pumped storage is also a type of gravity energy storage, which uses abundant low-cost electricity on the power grid to pump water to a higher reservoir, and then diverts the water from the reservoir to the generator set for hydroelectric power generation during peak electricity consumption, using the potential energy of water. A common type of gravity energy storage is to use a lifting system to lift a huge counterweight to a height of 100 meters or even higher during peak power generation, and then lower the counterweight during peak power consumption, using the potential energy conversion of the counterweight during the descent process, controlling the descent speed through a reduction gearbox, connecting the generator to generate electricity, and realizing the conversion, storage and release of surplus electricity. Existing energy storage power stations have many defects. For example, the energy storage method is single, resulting in low energy storage efficiency. Secondly, the construction structure of existing energy storage power stations is complex, resulting in huge investment in infrastructure, energy storage and power generation facilities, which affects the widespread application of gravity storage power stations. Summary of the invention

[0003] In order to solve the above problems, the purpose of the utility model is to provide a mountain gravity energy storage system, which uses a combination of gravity energy storage and hydraulic energy storage to store electric energy, thereby ensuring the stability and energy storage efficiency of the mountain gravity energy storage system.

[0004] The technical solution adopted by the utility model to solve the problem is:

[0005] A mountain gravity energy storage system, comprising a water pumping system, a gravity transmission system and an energy storage component;

[0006] The pumping system comprises a first reservoir, a second reservoir and a first reversible unit, the water level of the second reservoir is higher than the water level of the first reservoir, the first reservoir and the second reservoir are connected through a first auxiliary water tank, a connecting pipe and a second auxiliary water tank, the bottom of the first auxiliary water tank is lower than the bottom of the first reservoir, and the bottom of the second auxiliary water tank is lower than the bottom of the second reservoir; the first reversible unit is connected to the connecting pipe, the first reversible unit pumps water in the first auxiliary water tank into the second auxiliary water tank in a water pump mode, and the first reversible unit generates hydroelectric power by using the water level difference between the first reservoir and the second reservoir in a turbine mode;

[0007] The gravity transmission system includes a transport track for carrying the gravity block, a first storage bin, and a second storage bin, wherein the first storage bin is located below the first reservoir, the second storage bin is located below the second reservoir, and the transport track connects the first storage bin and the second storage bin with a height difference; the gravity transmission system also includes a second reversible unit, which drives the gravity block to move upward along the transport track in a driving mode, and the second reversible unit generates electricity using the descending potential energy of the gravity block in a power generation mode;

[0008] The energy storage assembly includes a first battery group and a second battery group, the first battery group is located above the first reservoir, and the second battery group is located above the second reservoir; the first reversible unit and the second reversible unit are both connected to the energy storage assembly through a current protection circuit.

[0009] The above-mentioned mountain gravity energy storage system has at least the following beneficial effects: by setting up a pumping system and a gravity transmission system, during the trough period of electricity consumption, the first reversible unit and the second reversible unit respectively transmit the water in the first reservoir and the gravity blocks in the first storage bin to the second reservoir and the second storage bin located at a high place, so as to ensure that the mountain gravity energy storage system can fully utilize the electric energy and perform gravity energy storage; during the peak period of electricity consumption, the water in the second reservoir and the gravity blocks in the second storage bin are respectively transmitted to the first reservoir and the first storage bin located at a low place through the connecting pipe and the transportation track under the action of gravity, driving the first reversible unit and the second reversible unit to generate electricity and output electric energy to the outside to meet the power supply demand and ensure the stability and energy storage efficiency of the mountain gravity energy storage system; by setting up the first auxiliary water tank and the second auxiliary water tank, the connecting pipe can stably connect the first reservoir and the second reservoir, shorten the pumping head of the first reversible unit, reduce the energy consumption in the energy storage process, and fully utilize the kinetic energy of the water in the first reservoir and the second reservoir, thereby improving the energy storage efficiency of the mountain gravity energy storage system.

[0010] Furthermore, the second reversible unit includes a plurality of roller devices and a plurality of reversible motors, the roller devices are used to carry the gravity block to rise or fall along the transport track, and each of the roller devices is connected to the rotating shaft of a reversible motor; the power connection end of the reversible motor is connected to the transmission line of the transport track through a brush, and the transmission line of the transport track is connected to the power grid. By setting the roller device and the reversible motor, the reversible motor roller device is ensured during the energy storage process, thereby improving the energy storage efficiency of the mountain gravity energy storage system. By setting the roller device and the reversible motor, the connection flexibility between the transport track and the gravity block is improved, the transmission efficiency of the gravity block is improved, and it is also convenient for the roller device and the reversible motor to be electrically connected, so as to convert the gravitational potential energy of the gravity block into electrical energy, thereby improving the operating efficiency of the mountain gravity energy storage system.

[0011] Furthermore, the first reversible unit is connected to the first battery pack through the current protection circuit; the second reversible unit is connected to the second battery pack through the current protection circuit. This structure facilitates the connection between the first reversible unit and the first battery pack, and the second reversible unit and the second battery pack, and simplifies the structure of the mountain gravity energy storage system.

[0012] Furthermore, the current protection circuit includes a high-power relay and a voltage sensor, and the output ends of the first reversible unit and the second reversible unit are connected to the energy storage component through the high-power relay; the voltage sensor is used to detect the bus voltage of the DC bus, and the switch control end of the high-power relay is connected to the voltage sensor, so as to trigger the closing of the high-power relay when the voltage value detected by the voltage sensor exceeds the preset voltage value, thereby forming a protection loop from the output ends of the first reversible unit and the second reversible unit to the energy storage component. By setting up the current protection circuit, the circuit between the pumping system, the gravity transmission system and the energy storage component is stabilized and limited in current, effectively avoiding the large current generated in the mountain gravity energy storage system during the conversion process of energy storage and release and in the event of a power supply line failure. The damage to the circuit and components such as the first reversible unit and the second reversible unit is improved, thereby improving the operating stability of the mountain gravity energy storage system.

[0013] Furthermore, the water level difference between the first reservoir and the second reservoir is greater than 100 meters. This water level difference ensures the flexibility of the site selection of the first reservoir and the second reservoir, and also makes full use of the height difference between the mountains to improve the energy storage efficiency of the mountain gravity energy storage system.

[0014] Furthermore, the second reversible unit drives the gravity block from the first storage bin to the second storage bin via the transport track; the output end of the second reversible unit is electrically connected to the transport track, and the gravity block drives the second reversible unit to generate electricity via the transport track under the action of gravity. This structure ensures that when the gravity block is transported from the second storage bin to the first storage bin under the action of gravity, it can drive the second reversible unit to generate electricity via the transport track, making full use of the gravity potential energy of the gravity block and improving the energy storage efficiency of the mountain gravity energy storage system.

[0015] Furthermore, the first reversible unit is located at one end of the connecting pipe close to the first reservoir. This structure ensures the speed at which the water in the second reservoir passes through the first reversible unit under the action of gravity, fully utilizes the gravitational potential energy of the water in the second reservoir, and improves the operating efficiency of the mountain gravity energy storage system.

[0016] Furthermore, one end of the connecting pipe is connected to the bottom of the first auxiliary water tank, and the other end of the connecting pipe is connected to the bottom of the second auxiliary water tank. This structure ensures that the connecting pipe can fully transfer water between the first reservoir and the second reservoir, avoiding the failure to transfer water at the bottom of the first reservoir and the second reservoir, resulting in energy waste.

[0017] Furthermore, the height difference between the bottom of the first auxiliary water tank and the bottom of the first water reservoir is greater than or equal to 1.5 times the diameter of the connecting pipe near the end of the first auxiliary water tank; the height difference between the bottom of the second auxiliary water tank and the bottom of the second water reservoir is greater than or equal to 1.5 times the diameter of the connecting pipe near the end of the second auxiliary water tank. This structure ensures the height difference between the first auxiliary water tank and the first reservoir, and the height difference between the second auxiliary water tank and the second reservoir, and prevents air from entering the connecting pipe when the water level of the first reservoir and the second reservoir is too low, which affects the working efficiency of the first reversible unit 130 and the energy storage efficiency of the mountain gravity energy storage system.

[0018] Furthermore, the diameter of the connecting pipe gradually increases in the direction close to the middle position of the connecting pipe. The connecting pipe of this structure can effectively control the amount of water passing through the first reversible unit, avoiding the output power of the first reversible unit from being too high or too low, which affects the stability of the mountain gravity energy storage system.

[0019] The beneficial effects of the mountain gravity energy storage system are as follows: by setting up a pumping system and a gravity transmission system, during the off-peak period of electricity consumption, the first reversible unit and the second reversible unit respectively transmit the water in the first reservoir and the gravity blocks in the first storage bin to the second reservoir and the second storage bin located at a higher place, so as to ensure that the mountain gravity energy storage system can fully utilize the electricity and perform gravity energy storage; during the peak period of electricity consumption, the water in the second reservoir and the gravity blocks in the second storage bin are respectively transmitted to the first reservoir and the first storage bin located at a lower place through connecting pipes and transportation tracks under the action of gravity, driving the first reversible unit and the second reversible unit to generate electricity and output electricity to the outside to meet the power supply demand and ensure the stability and energy storage efficiency of the mountain gravity energy storage system; by setting up a first auxiliary water tank and a second auxiliary water tank, connecting The pipeline can stably connect the first reservoir and the second reservoir, shorten the pumping head of the first reversible unit, reduce the energy consumption in the energy storage process, and make full use of the kinetic energy of the water in the first reservoir and the second reservoir, thereby improving the energy storage efficiency of the mountain gravity energy storage system; by setting a current protection circuit, the lines between the pumping system, the gravity transmission system and the energy storage components can be stabilized and limited, effectively avoiding the large current generated in the mountain gravity energy storage system during the conversion process of energy storage and energy release and in the case of power supply line failure. The line and components such as the first reversible unit and the second reversible unit are damaged, thereby improving the operation stability of the mountain gravity energy storage system; by setting a roller device and a reversible motor, the reversible motor roller device is ensured during the energy storage process, thereby improving the energy storage efficiency of the mountain gravity energy storage system. By setting a roller device and a reversible motor, the connection flexibility between the transport track and the gravity block is improved, the transmission efficiency of the gravity block is improved, and it is also convenient for the roller device and the reversible motor to be electrically connected, so as to convert the gravitational potential energy of the gravity block into electrical energy, thereby improving the operation efficiency of the mountain gravity energy storage system.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 This is a structural schematic diagram of a mountain gravity energy storage system according to an embodiment of the utility model;

[0023] Figure 2 This is a schematic diagram of a mountain gravity energy storage system according to an embodiment of the utility model. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0025] Reference Figure 1 and Figure 2 The embodiment of the utility model provides a mountain gravity energy storage system, including a pumping system 100, a gravity transmission system 200 and an energy storage assembly 300; the pumping system 100 includes a first reservoir 110, a second reservoir 120 and a first reversible unit 130, the water level of the second reservoir 120 is higher than the water level of the first reservoir 110, the first reservoir 110 and the second reservoir 120 are connected through a first auxiliary water tank 111, a connecting pipe 140 and a second auxiliary water tank 121, and the first The bottom of the auxiliary water tank 111 is lower than the bottom of the first water reservoir 110, and the bottom of the second auxiliary water tank 121 is lower than the bottom of the second water reservoir 120; the first reversible unit 130 is connected to the connecting pipe 140, and the first reversible unit 130 pumps water in the first auxiliary water tank 111 into the second auxiliary water tank 121 in the water pump mode, and the first reversible unit 130 generates hydroelectric power by using the water level difference between the first water reservoir 110 and the second water reservoir 120 in the turbine mode; the gravity transmission system 2 00 includes a transport track 220 for carrying a gravity block 210, a first storage bin 230, and a second storage bin 240. The first storage bin 230 is located below the first reservoir 110, and the second storage bin 240 is located below the second reservoir 120. The transport track 220 connects the first storage bin 230 and the second storage bin 240 with a height difference; the gravity transmission system 200 also includes a second reversible unit 250. The second reversible unit 250 drives the gravity block 210 to move upward along the transport track 220 in a driving mode, and the second reversible unit 250 generates electricity using the descending potential energy of the gravity block 210 in a power generation mode; the energy storage component 300 includes a first battery group 310 and a second battery group 320. The first battery group 310 is located above the first reservoir 110, and the second battery group 320 is located above the second reservoir 120; the first reversible unit 130 and the second reversible unit 250 are both connected to the energy storage component 300 through a current protection circuit 150.

[0026] By setting up a pumping system 100 and a gravity transmission system 200, during the off-peak period of electricity consumption, the first reversible unit 130 and the second reversible unit 250 respectively transmit the water in the first reservoir 110 and the gravity block 210 in the first storage bin 230 to the second reservoir 120 and the second storage bin 240 located at a high place, so as to ensure that the mountain gravity energy storage system can fully utilize the electric energy and perform gravity energy storage; during the peak period of electricity consumption, the water in the second reservoir 120 and the gravity block 210 in the second storage bin 240 are respectively transmitted to the second reservoir 120 and the second storage bin 240 located at a low place through the connecting pipe 140 and the transportation track 220 under the action of gravity. A reservoir 110 and a first storage bin 230 drive the first reversible unit 130 and the second reversible unit 250 to generate electricity and output electrical energy to the outside to meet the power supply demand and ensure the stability and energy storage efficiency of the mountain gravity energy storage system; by setting the first auxiliary water tank 111 and the second auxiliary water tank 121, the connecting pipe 140 can stably connect the first reservoir 110 and the second reservoir 120, shorten the pumping head of the first reversible unit 130, reduce the energy consumption in the energy storage process, and fully utilize the kinetic energy of the water in the first reservoir 110 and the second reservoir 120 to improve the energy storage efficiency of the mountain gravity energy storage system.

[0027] In other embodiments, the first reservoir 110 and the second reservoir 120 can also store fluids with a higher specific gravity than water, such as wastewater, etc., which can further utilize the kinetic energy of the fluids in the first reservoir 110 and the second reservoir 120, and can also synchronously transport and process the wastewater, thereby improving the energy storage efficiency and comprehensive benefits of the mountain gravity energy storage system.

[0028] Reference Figure 1 In another embodiment, the second reversible unit 250 includes a plurality of roller devices 251 and a plurality of reversible motors 252. The roller devices 251 are used to carry the weight block 210 to rise or fall along the transport track 220. Each roller device 251 is connected to the rotating shaft of a reversible motor 252. The power connection end of the reversible motor 252 is connected to the transmission line of the transport track 220 through a brush, and the transmission line of the transport track 220 is connected to the power grid. By setting the roller device 251 and the reversible motor 252, it is ensured that during the energy storage process, the reversible motor 252 and the roller device 251 are used to improve the energy storage efficiency of the mountain gravity energy storage system. By providing the roller device 251 and the reversible motor 252, the connection flexibility between the transport track 220 and the gravity block 210 is improved, the transmission efficiency of the gravity block 210 is improved, and it is also convenient to electrically connect the roller device 251 and the reversible motor 252, so as to convert the gravitational potential energy of the gravity block 210 into electrical energy, thereby improving the operating efficiency of the mountain gravity energy storage system.

[0029] In another embodiment, the first reversible machine group 130 is connected to the first battery group 310 through the current protection circuit 150; the second reversible machine group 250 is connected to the second battery group 320 through the current protection circuit 150. This structure facilitates the connection between the first reversible machine group 130 and the first battery group 310, and the second reversible machine group 250 and the second battery group 320, and simplifies the structure of the mountain gravity energy storage system.

[0030] In another embodiment, the current protection circuit 150 includes a high-power relay 151 and a voltage sensor 152. The output ends of the first reversible unit 130 and the second reversible unit 250 are connected to the energy storage assembly 300 through the high-power relay 151. The voltage sensor 152 is used to detect the bus voltage of the DC bus. The switch control end of the high-power relay 151 is connected to the voltage sensor 152, so that when the voltage value detected by the voltage sensor 152 exceeds the preset voltage value, the high-power relay 151 is triggered to close, forming a protection loop from the output ends of the first reversible unit 130 and the second reversible unit 250 to the energy storage assembly 300. By setting the current protection circuit 150, the circuit between the pumping system 100, the gravity transmission system 200 and the energy storage assembly 300 plays a role in voltage stabilization and current limiting, effectively avoiding the large current generated in the mountain gravity energy storage system during the conversion process of energy storage and energy release and in the case of power supply line failure to damage the circuit and components such as the first reversible unit 130 and the second reversible unit 250, thereby improving the operating stability of the mountain gravity energy storage system. In some embodiments, the voltage sensor 152 is connected to the coil of the high-power relay 151. When the voltage value detected by the voltage sensor 152 exceeds the preset voltage value, the magnetic force generated by the coil of the high-power relay 151 exceeds the preset value and controls the high-power relay 151 to close, so that the output ends of the first reversible unit 130 and the second reversible unit 250 are connected to the energy storage component 300, forming a protection circuit. Of course, in other embodiments, the voltage value detected by the voltage sensor 152 can also be identified by the control chip, and a closing instruction is issued to the high-power relay 151, which also forms a protection circuit, which is not limited here.

[0031] In another embodiment, the water level difference between the first reservoir 110 and the second reservoir 120 is greater than 100 meters. This water level difference ensures the flexibility of the site selection of the first reservoir 110 and the second reservoir 120, and also makes full use of the height difference between the mountains to improve the energy storage efficiency of the mountain gravity energy storage system.

[0032] In another embodiment, the second reversible unit 250 drives the gravity block 210 to be transported from the first storage bin 230 to the second storage bin 240 via the transport track 220; the output end of the second reversible unit 250 is electrically connected to the transport track 220, and the gravity block 210 drives the second reversible unit 250 to generate electricity via the transport track 220 under the action of gravity. This structure ensures that when the gravity block 210 transports the first storage bin 230 from the second storage bin 240 under the action of gravity, it can drive the second reversible unit 250 to generate electricity via the transport track 220, making full use of the gravitational potential energy of the gravity block 210 and improving the energy storage efficiency of the mountain gravity energy storage system. In this embodiment, the second reversible unit 250 is provided with a bidirectional motor, which is transmission-connected to the transport track 220. The bidirectional motor can drive the gravity block 210 to move along the transport track 220, and then transport the gravity block 210 from the first storage bin 230 to the second storage bin 240; when the gravity block 210 is transported from the second storage bin 240 to the first storage bin 230 under the action of gravity, the bidirectional motor is driven to reversely operate and generate electricity. In this embodiment, the first reversible unit 130 is located on the side close to the first reservoir 110. This structure facilitates the connection between the first reversible unit 130 and the first battery group 111, simplifies the structure of the mountain gravity energy storage system, and saves the construction investment of the mountain gravity energy storage system.

[0033] In another embodiment, the first reversible unit 130 is located at one end of the connecting pipe 140 close to the first reservoir 110. This structure ensures the speed at which the water in the second reservoir 120 passes through the first reversible unit 130 under the action of gravity, fully utilizes the gravitational potential energy of the water in the second reservoir 120, and improves the operating efficiency of the mountain gravity energy storage system.

[0034] In another embodiment, one end of the connecting pipe 140 is connected to the bottom of the first auxiliary water tank 111, and the other end of the connecting pipe 140 is connected to the bottom of the second auxiliary water tank 121. This structure ensures that the connecting pipe 140 can fully transfer water between the first reservoir 110 and the second reservoir 120, avoiding the failure to transfer water at the bottom of the first reservoir 110 and the second reservoir 120, resulting in energy waste.

[0035] In another embodiment, the height difference between the bottom of the first auxiliary water tank 111 and the bottom of the first water reservoir 110 is greater than or equal to 1.5 times the diameter of the connecting pipe 140 at one end close to the first auxiliary water tank 111; the height difference between the bottom of the second auxiliary water tank 121 and the bottom of the second water reservoir 120 is greater than or equal to 1.5 times the diameter of the connecting pipe 140 at one end close to the second auxiliary water tank 121. This structure ensures the height difference between the first auxiliary water tank 111 and the first water reservoir 110, and the height difference between the second auxiliary water tank 121 and the second water reservoir 120, and prevents air from entering the connecting pipe when the water level of the first reservoir 110 and the second reservoir 120 is too low, which affects the working efficiency of the first reversible unit 130 and the energy storage efficiency of the mountain gravity energy storage system.

[0036] In another embodiment, the diameter of the connecting pipe 140 gradually increases in the direction close to the middle position of the connecting pipe 140. The connecting pipe 140 of this structure can effectively control the amount of water passing through the first reversible unit 130, and avoid the output power of the first reversible unit 130 from being too high or too low, which affects the stability of the mountain gravity energy storage system.

[0037] The working principle of the utility model is further explained below.

[0038] During the construction process, firstly, the first reservoir 110, the first storage bin 230, the second reservoir 120, and the second storage bin 240 are respectively set at appropriate positions on the top of the mountain and the foot of the mountain. Specifically, the first storage bin 230 is built at the top of the mountain, and the second storage bin 240 is built at the foot of the mountain; then the first reservoir 110 is set above the first storage bin 230, and the second reservoir 120 is set above the second storage bin 240. The transport track 220 is laid between the first storage bin 230 and the second storage bin 240, and the second reversible unit 250 is installed, so that the second reversible unit 250 drives the gravity block 210 to move back and forth between the first storage bin 230 and the second storage bin 240; specifically, the second reversible unit 250 can be connected to the movable transport track 220 through the transmission system, and the second reversible unit 250 drives the transport track 220 to operate, or the operating transport track 220 drives the second reversible unit 250 to generate electricity; in actual application, in order to ensure the energy storage efficiency rate, the water level difference between the first reservoir 110 and the second reservoir 120 is greater than 100 meters, so as to make full use of the height difference between the mountains and improve the working efficiency of the mountain gravity energy storage system; then, a first auxiliary water tank 111 is set at the side and lower part of the first reservoir 110, and a second auxiliary water tank 121 is set at the side and lower part of the second reservoir 120, wherein the bottom of the first auxiliary water tank 111 is lower than the bottom of the first reservoir 110, and the bottom of the second auxiliary water tank 121 is lower than the bottom of the second reservoir 120; a connecting pipe 140 is set between the first auxiliary water tank 111 and the second auxiliary water tank 121, and it is ensured that the diameter of the connecting pipe 140 gradually decreases in the direction close to the first auxiliary water tank 111 and the second auxiliary water tank 121, so as to effectively control the amount of water passing through the connecting pipe 140, and avoid the output electric energy of the mountain gravity energy storage system from being too high or too low, which affects the stability of the mountain gravity energy storage system; then, a first reversible unit 130 is installed at one end of the connecting pipe 140 close to the first auxiliary water tank 111. In other embodiments, the second reversible unit 250 can also be provided with a roller device 251 and a reversible motor 252 that are interconnected, so that the reversible motor 252 drives the roller device 251 and the gravity block 210 to be transmitted to a high place in the driving mode; when the reversible motor 252 is in the power generation mode, when the roller device 251 and the gravity block 210 move to a low place, the reversible motor 252 is driven by the roller device 251 to generate electricity; finally, a current protection circuit 150 is provided between the energy storage component 300 and the first reversible unit 130 and the second reversible unit 250 to stabilize the voltage and limit the current of the lines between the pumping system 100, the gravity transmission system 200 and the energy storage component 300.In this way, the construction and installation of the mountain gravity energy storage system is completed. The positions of the first reservoir 110 and the second reservoir 120 can be flexibly selected according to the mountain environment. The first reservoir 110 and the second reservoir 120 are buffered by the first auxiliary water tank 111 and the second auxiliary water tank 121, and the gravitational potential energy of the water in the first reservoir 110 and the second reservoir 120 is effectively utilized; the first battery group 310 is located on one side of the first reservoir 110 and is electrically connected to the first reversible unit 130, and the second battery group 320 is located on one side of the second reservoir 120 and is electrically connected to the second reversible unit 250, which effectively simplifies the structure of the mountain gravity energy storage system and saves the construction cost of the mountain gravity energy storage system.

[0039] During use, the peak period of electricity consumption and the valley period of electricity consumption refer to the load state of the external social public power grid; the peak period of electricity consumption is the power generation stage of the mountain gravity energy storage system, and the valley period of electricity consumption is the energy storage stage of the mountain gravity energy storage system. Specifically, during the valley period of electricity consumption, the first reversible unit 130 is in the water pump mode, and the second reversible unit 250 is in the driving mode, respectively transmitting the water in the first reservoir 110 and the gravity block 210 in the first storage bin 230 to the second reservoir 120 and the second storage bin 240 located at a high place, so as to ensure that the mountain gravity energy storage system can fully utilize the electric energy and perform gravity energy storage. During the peak period of electricity consumption, the first reversible unit 130 enters the turbine mode and the second reversible unit 250 enters the power generation mode. The water in the second reservoir 120 and the gravity block 210 in the second storage bin 240 are respectively transmitted to the first reservoir 110 and the first storage bin 230 located at a lower position through the connecting pipe 140 and the transportation track 220 under the action of gravity, driving the first reversible unit 130 and the second reversible unit 250 to generate electricity, and output electrical energy to the outside through the energy storage component 300 to meet the power supply demand and ensure the stability and energy storage efficiency of the mountain gravity energy storage system. During the switching process between the power generation stage and the energy storage stage of the mountain gravity energy storage system, due to the change in the load connected to the energy storage component 300, the current change value between the pumping system 100 and the gravity transmission system 200 and the energy storage component 300 will increase. The current protection circuit 150 can effectively respond to the voltage spikes caused by the sudden change of current by setting a varistor, protect the first reversible unit 130 and the second reversible unit 250 and other components, and ensure the stability and service life of the mountain gravity energy storage system.

[0040] From the above description, it can be seen that the mountain gravity energy storage system of the utility model is provided with a pumping system 100 and a gravity transmission system 200. During the off-peak period of electricity consumption, the first reversible unit 130 and the second reversible unit 250 respectively transmit the water in the first reservoir 110 and the gravity block 210 in the first storage bin 230 to the second reservoir 120 and the second storage bin 240 located at a high place, so as to ensure that the mountain gravity energy storage system can make full use of electric energy and perform gravity energy storage; during the peak period of electricity consumption, the water in the second reservoir 120 and the gravity block 210 in the second storage bin 240 are respectively transmitted to the first reservoir 110 and the first storage bin 230 located at a low place through the connecting pipe 140 and the transportation track 220 under the action of gravity, so as to drive the first reversible unit 130 and the second reversible unit 250 to generate electricity and output electric energy to the outside, so as to meet the power supply demand and ensure the stability and energy storage efficiency of the mountain gravity energy storage system; by providing the first auxiliary water tank 111 and the second The second auxiliary water tank 121 and the connecting pipe 140 can stably connect the first reservoir 110 and the second reservoir 120, shorten the pumping head of the first reversible unit 130, reduce the energy consumption in the energy storage process, and make full use of the kinetic energy of the water in the first reservoir 110 and the second reservoir 120, thereby improving the energy storage efficiency of the mountain gravity energy storage system; by setting the current protection circuit 150, the circuit between the pumping system 100, the gravity transmission system 200 and the energy storage component 300 is stabilized and limited in current, effectively avoiding the large current generated in the mountain gravity energy storage system during the conversion process of energy storage and energy release and in the case of power supply line failure. The damage to the circuit and components such as the first reversible unit 130 and the second reversible unit 250 is improved, thereby improving the operating stability of the mountain gravity energy storage system; by setting the roller device 251 and the reversible motor 252, it is ensured that during the energy storage process, the reversible motor 252 and the roller device 251 are used to improve the energy storage efficiency of the mountain gravity energy storage system. By providing the roller device 251 and the reversible motor 252, the connection flexibility between the transport track 220 and the gravity block 210 is improved, the transmission efficiency of the gravity block 210 is improved, and it is also convenient to electrically connect the roller device 251 and the reversible motor 252, so as to convert the gravitational potential energy of the gravity block 210 into electrical energy, thereby improving the operating efficiency of the mountain gravity energy storage system.

[0041] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A mountain gravity energy storage system, characterized in that: It comprises a water pumping system (100), a gravity transmission system (200) and an energy storage component (300); The pumping system (100) comprises a first water reservoir (110), a second water reservoir (120) and a first reversible unit (130); the water level of the second water reservoir (120) is higher than the water level of the first water reservoir (110); the first water reservoir (110) and the second water reservoir (120) are connected via a first auxiliary water tank (111), a connecting pipe (140) and the second auxiliary water tank (121); the bottom of the first auxiliary water tank (111) is lower than the bottom of the first water reservoir (110); The bottom of the second auxiliary water tank (121) is lower than the bottom of the second water reservoir (120); the first reversible unit (130) is connected to the connecting pipe (140); the first reversible unit (130) pumps water from the first auxiliary water tank (111) into the second auxiliary water tank (121) in a water pump mode; and the first reversible unit (130) generates hydroelectric power by utilizing the water level difference between the first water reservoir (110) and the second water reservoir (120) in a water turbine mode; The gravity transmission system (200) comprises a transport track (220) for carrying a gravity block (210), a first storage bin (230), and a second storage bin (240), wherein the first storage bin (230) is located below the first water reservoir (110), and the second storage bin (240) is located below the second water reservoir (120), and the transport track (220) connects the first storage bin (230) and the second storage bin (240) which have a height difference; the gravity transmission system (200) further comprises a second reversible unit (250), wherein the second reversible unit (250) drives the gravity block (210) to move upward along the transport track (220) in a driving mode, and the second reversible unit (250) generates electricity using the descending potential energy of the gravity block (210) in a power generation mode; The energy storage assembly (300) comprises a first battery group (310) and a second battery group (320); the first battery group (310) is located above the first water reservoir (110), and the second battery group (320) is located above the second water reservoir (120); the first reversible machine group (130) and the second reversible machine group (250) are both connected to the energy storage assembly (300) via a current protection circuit (150).

2. A mountain gravity energy storage system according to claim 1, characterized in that: The second reversible unit (250) comprises a plurality of roller devices (251) and a plurality of reversible motors (252); the roller devices (251) are used to carry the weight block (210) to rise or fall along the transport track (220); each of the roller devices (251) is connected to the rotating shaft of a reversible motor (252); the power connection end of the reversible motor (252) is connected to the transmission line of the transport track (220) through a brush, and the transmission line of the transport track (220) is connected to a power grid line.

3. A mountain gravity energy storage system according to claim 1, characterized in that: The first reversible machine group (130) is connected to the first battery group (310) via the current protection circuit (150); and the second reversible machine group (250) is connected to the second battery group (320) via the current protection circuit (150).

4. A mountain gravity energy storage system according to claim 3, characterized in that: The current protection circuit (150) comprises a high-power relay (151) and a voltage sensor (152); the output ends of the first reversible unit (130) and the second reversible unit (250) are connected to the energy storage assembly (300) via the high-power relay (151); the voltage sensor (152) is used to detect the bus voltage of the DC bus; the switch control end of the high-power relay (151) is connected to the voltage sensor (152) so as to trigger the high-power relay (151) to close when the voltage value detected by the voltage sensor (152) exceeds a preset voltage value, thereby forming a protection loop from the output ends of the first reversible unit (130) and the second reversible unit (250) to the energy storage assembly (300).

5. A mountain gravity energy storage system according to claim 1, characterized in that: The water level difference between the first reservoir (110) and the second reservoir (120) is greater than 100 meters.

6. A mountain gravity energy storage system according to claim 1, characterized in that: The second reversible unit (250) drives the gravity block (210) to be transported from the first storage bin (230) to the second storage bin (240) via the transport track (220); an output end of the second reversible unit (250) is electrically connected to the transport track (220), and the gravity block (210) drives the second reversible unit (250) to generate electricity via the transport track (220) under the action of gravity.

7. A mountain gravity energy storage system according to claim 1, characterized in that: The first reversible unit (130) is located at one end of the connecting pipe (140) close to the first water reservoir (110).

8. A mountain gravity energy storage system according to claim 1, characterized in that: One end of the connecting pipe (140) is connected to the bottom of the first auxiliary water tank (111), and the other end of the connecting pipe (140) is connected to the bottom of the second auxiliary water tank (121).

9. A mountain gravity energy storage system according to claim 8, characterized in that: The height difference between the bottom of the first auxiliary water tank (111) and the bottom of the first water reservoir (110) is greater than or equal to 1.5 times the diameter of the connecting pipe (140) at one end close to the first auxiliary water tank (111); the height difference between the bottom of the second auxiliary water tank (121) and the bottom of the second water reservoir (120) is greater than or equal to 1.5 times the diameter of the connecting pipe (140) at one end close to the second auxiliary water tank (121).

10. A mountain gravity energy storage system according to claim 8, characterized in that: The diameter of the connecting pipe (140) gradually increases in a direction approaching a middle position of the connecting pipe (140).

Images