Vacuum-gravity hybrid energy storage workstation and device for new energy power generation system

Abstract

The present disclosure provides a vacuum-gravity hybrid energy storage workstation for a new energy power generation system, including a frame and a transmission shaft, a generator motor and several energy storage devices all located within the floor area thereof, each energy storage device respectively including a matching energy storage module, a suspension module and a mechanical transmission module; each energy storage module is connected to the transmission shaft through a corresponding suspension module and a mechanical transmission module, and a vacuum element and a weight are provided in the energy storage module; when the vacuum element moves under the action of the suspension module, a vacuum is formed in its internal closed chamber, and a liquid is covered on its end surface to generate pressure potential energy, and when the weight moves upward, gravity potential energy is generated to achieve two types of energy storage; when the pressure potential energy of the vacuum element in each energy storage module and the gravity potential energy of the weight act on the suspension module to rotate the generator motor to generate electricity, energy release is achieved. The present disclosure can achieve large-capacity and multiple ways of energy storage and energy release, with a wide range of applicable scenarios, and has a high energy storage density and high integration.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind power generation and potential energy storage, and in particular relates to a vacuum-gravity hybrid energy storage workstation and device for a new energy power generation system. Background Art

[0002] Wind power and solar energy are both renewable energy sources. Since they come from nature, they will not be exhausted. This characteristic makes wind power generation and photovoltaic power generation a good choice for sustainable power supply. Affected by natural and technical factors, wind power generation and photovoltaic power generation are intermittent, random, and poorly dispatchable, which will cause a series of power quality problems. First, when wind power generation and photovoltaic power generation are affected by weather and the output power fluctuates, it will cause voltage fluctuations on the wind farm transmission line, which will in turn cause grid voltage fluctuations; when the output power of the wind power generation system is large, flicker will also occur. Secondly, since the output of wind power generation and photovoltaic power generation is somewhat random, as the proportion of these two new energy sources in the total power generation of the power grid continues to increase, there may be frequency fluctuations in the power grid, which will have a bad impact on the power system and its users. In addition, since wind power generation and photovoltaic power generation both use a large number of power electronic equipment, they will generate a large number of harmonics and DC components. After the harmonics are injected into the power system, they will cause voltage distortion in the power grid system and affect the power quality of the entire power grid system. When the proportion of these two new energy sources is not large, the above defects can be controlled within the range allowed by the power grid through existing power electronics technology; when these two new energy sources are connected to the grid on a large scale, it will have a great impact on the power system. Therefore, the power grid must control the access to these two new energy sources within a controllable range to minimize the adverse effects. This not only restricts the construction scale and development speed of these two new energy sources, but also causes coal-fired power plants to remain as the main power generation force to ensure the smooth operation of the power grid. With the continuous development of new energy power generation, part of the power generation capacity of the above two new energy sources is often not utilized, making it impossible for new energy power generation companies to obtain the expected investment returns. To this end, measures have been taken to develop and promote new energy storage technologies and supporting new energy storage power stations to improve the utilization rate of new energy, thereby achieving energy conservation and environmental protection. Secondly, new energy storage technologies can improve the reliability and stability of energy. Since energy storage power stations using new energy storage technologies require large capital investments, they currently play three main roles: First, balancing electricity supply and demand. Energy storage power stations can store electricity during peak electricity demand to balance electricity supply and ensure the stability of the power network, which helps reduce the risk of power outages and improve the reliability of the power system. Second, integrating renewable energy: Renewable energy such as wind and solar energy are volatile. Energy storage power stations can capture and store excess electricity to provide electricity during unstable periods. Third, frequency regulation and backup power supply. Energy storage power stations can be used as frequency regulation equipment for the power system to quickly respond to fluctuations in electricity demand.However, this cannot completely eliminate the above-mentioned adverse effects of these two types of renewable energy generation on the power grid. For the stability of the entire power grid and high power quality, renewable energy can only occupy a small share in the power supply. The traditional power generation method based on coal-fired power generation is still the main means of power generation due to the full controllable power generation process and excellent power quality. This is contrary to the original intention of vigorously developing renewable energy. Therefore, a storage device with good economy and safety is used between the renewable energy power station and the main power grid to completely absorb the unstable power generated by photovoltaic and wind power generation, and then generate electricity according to the needs of the power grid. It can provide stable power for a period of time, which can solve the above problems well. For this reason, people are also trying to study vacuum energy storage technology.

[0003] The basic principle of vacuum energy storage technology is to use electric energy to do work on the motor, drive the active end of the component with an internal closed chamber to move, form an internal vacuum, and convert the electric energy into pressure potential energy on the outer surface of the vacuum component; when generating electricity, the pressure of the external medium is used to act on the active end of the component with vacuum to do work, drive the generator to rotate, and thus convert the pressure potential energy into electric energy. The vacuum energy storage device developed according to the basic principle of vacuum energy storage has the advantages of safety, fast response, large energy storage capacity, and long life. Since vacuum energy storage is carried out in the atmosphere, the energy storage density of the energy storage device is low. Generally, the energy storage element that can generate vacuum is placed in a medium with a large pressure, such as using the pressure of water at a greater depth in the ocean, rivers, and lakes to enable the vacuum element to obtain a larger energy storage density. However, many inland areas do not have such conditions. If a vacuum element with an internal sealed chamber is placed deep in a container filled with water in an inland area, when the vacuum element forms an internal vacuum and the volume needs to increase, the water needs to be discharged. When the pressure generated on the surface of the vacuum element is used to do work and the volume of the vacuum element decreases, water needs to be injected. For this purpose, it is necessary to build an upper reservoir with higher terrain next to the device, or place the energy storage device in a deep well and build a reservoir next to the deep well. This not only increases the cost, but is also completely unfeasible in the northwest region with a large evaporation rate. In addition, the short energy release time of the vacuum energy storage device is also a technical problem that affects its application. Summary of the invention

[0004] The present disclosure aims to solve one of the technical problems in the related art at least to some extent.

[0005] To this end, the present disclosure provides a vacuum-gravity hybrid energy storage workstation and device for a new energy power generation system. The present disclosure overcomes the problem that vacuum energy storage is mostly suitable for rivers, lakes and seas, but not suitable for application in water-scarce inland areas by constructing a vacuum-gravity hybrid energy storage device with a vacuum element capable of generating a vacuum and a plurality of energy storage workstations capable of generating gravitational potential energy: by configuring a heavy object at the opening of a liquid storage tank, the liquid discharged from the energy storage of the vacuum element is collected in the space below which is synchronously vacated by the heavy object in the liquid storage tank, which not only ensures a stable load, but also reduces the serious volatilization caused by the liquid discharge support guide cylinder, reduces the cost, and realizes large-capacity and multiple modes of energy storage and release, with high energy storage density and high integration. By connecting the above-mentioned vacuum-gravity hybrid energy storage device between the existing wind power or photovoltaic power generation system and the power grid, the above-mentioned two kinds of renewable energy power generation are not directly connected to the grid, but are stored in the above-mentioned vacuum-gravity hybrid energy storage device; when the main power grid needs electric energy, the above-mentioned vacuum-gravity hybrid energy storage device releases energy. The energy release process of the above-mentioned vacuum-gravity hybrid energy storage device is fully controllable, and the energy release time is relatively long, which solves the technical problems caused by the instability of the two kinds of renewable energy power generation and creates conditions for the comprehensive establishment of a power supply pattern based on new energy.

[0006] In order to achieve the above objectives, the present disclosure adopts the following technical solutions:

[0007] A vacuum-gravity hybrid energy storage workstation for a new energy power generation system provided in a first aspect of the present disclosure comprises a frame, and a transmission shaft, a first clutch, a transmission, a generator motor and a plurality of energy storage modules all located within the footprint of the frame, wherein each energy storage module is respectively equipped with a suspension module and a mechanical transmission module;

[0008] Each energy storage module is connected to the transmission shaft through the corresponding suspension module and the mechanical transmission module and is evenly arranged on both sides of the transmission shaft. A single energy storage module has a plurality of energy storage sub-modules arranged in an array, with the direction parallel to the transmission shaft as the row and the direction perpendicular to the transmission shaft as the column. The energy storage sub-modules in the same row or column are regarded as a group of energy storage sub-modules.

[0009] The energy storage submodule comprises a vacuum energy storage mechanism, a gravity energy storage mechanism and a hanger; the vacuum energy storage mechanism comprises a support guide cylinder and a vacuum element located therein, a closed chamber is formed inside the vacuum element, one end of the vacuum element is fixedly connected to one end of the support guide cylinder, and the other end of the vacuum element is a movable end connected to the hanger; the gravity energy storage mechanism comprises a liquid storage tank communicated with the support guide cylinder and a weight located in the liquid storage tank and connected to the hanger, the liquid storage tank and the support guide cylinder both contain liquid, and in the process in which the weight and the movable end of the vacuum element follow the synchronous movement of the hanger, the liquid flows between the liquid storage tank and the support guide cylinder, and at least one surface of the weight is in contact with the liquid, and the movable end of the vacuum element is continuously subjected to the pressure from the liquid;

[0010] The suspension module is connected between the matching mechanical transmission module and the energy storage module, and the suspension module includes a drum wound with a steel wire rope, a plurality of pulley groups and a plurality of inter-group fixed pulleys. The drum is supported in the frame, and each pulley group cooperates with a corresponding energy storage submodule in the energy storage module, each pulley group consists of at least two fixed pulleys and at least one movable pulley, and one inter-group fixed pulley is respectively arranged between adjacent groups of energy storage submodules in the energy storage module; one end of the steel wire rope is fixed on the drum, and the other end is fixedly connected to the frame after passing through each pulley group and the inter-group fixed pulley in sequence; as the number of turns of the steel wire rope wound on the drum changes, each hanger in the energy storage module moves synchronously with the corresponding movable pulley, so that the pressure potential energy generated by the change of the vacuum volume of the closed chamber inside each vacuum element and the gravitational potential energy generated by the movement of each heavy object change synchronously, thereby realizing energy storage and energy release;

[0011] The transmission shaft is rotatably connected to the frame, one end of the transmission shaft is connected to one end of the transmission through the first clutch, and the other end of the transmission is connected to the generator motor through an elastic coupling. The transmission matches the speed difference between the transmission shaft and the set speed of the generator motor, and the generator motor is connected to the power cable of the new energy power generation system through a power cable.

[0012] In some embodiments, the vacuum element forms a vacuum by moving a portion of its inner surface in at least one direction to increase the size of the internal closed chamber, and forms pressure potential energy exceeding the atmospheric pressure under the pressure of the liquid, and the pressure potential energy is the positional release energy generated by the pressure acting on the outer surface of the vacuum element.

[0013] In some embodiments, the vacuum element is foldable or telescopic; the weight is located near the connection between the liquid storage tank and the support guide cylinder;

[0014] The support guide cylinder and the liquid storage tank adopt a vertical shaft structure buried underground or a vertical cylindrical structure arranged on the ground and fixedly connected to the frame.

[0015] In some embodiments, in the energy storage submodule, the total vacuum volume that can be increased by the vacuum element is equal to the volume of liquid discharged from the liquid storage tank during the process from the initial immersion of the weight to the final immersion of the weight into the liquid of the liquid storage tank;

[0016] During energy storage operation, the liquid flows from the support guide cylinder into the liquid storage tank, and when the energy storage submodule is in full load energy storage, the lower surface of the weight is not higher than the liquid level in the liquid storage tank;

[0017] During the energy release operation, the liquid flows from the liquid storage tank into the support guide cylinder. When the energy storage submodule is in full load energy release, the upper surface of the weight is not lower than the liquid level in the liquid storage tank.

[0018] In some embodiments, the number of the energy storage modules is 4 to 10, and is an even number;

[0019] In a single energy storage submodule, 1 to 8 vacuum energy storage mechanisms are provided. When multiple vacuum energy storage mechanisms are provided, the circumferences of the vacuum energy storage mechanisms are evenly distributed on the periphery of the gravity energy storage mechanism.

[0020] In a single vacuum energy storage mechanism, one or more vacuum elements connected in series are provided.

[0021] In some embodiments, the transmission shaft, the reel and the mechanical transmission mechanism are all arranged close to the bottom plate of the frame, and the transmission shaft is perpendicular to the long side of the bottom plate.

[0022] In some embodiments, the mechanical transmission module adopts a sprocket chain transmission method, a gear transmission method or a synchronous toothed belt transmission method to realize the mechanical transmission between the transmission shaft and the energy storage module.

[0023] In some embodiments, the mechanical transmission module includes a second clutch, a clutch bracket, a first sprocket, a chain, a second sprocket and a one-way overrunning clutch; the second clutch is connected to the reel, the second clutch and the first sprocket are supported on the bottom plate of the frame through the clutch bracket, the outer cylindrical surface of the one-way overrunning clutch cooperates with the inner hole of the second sprocket, the inner hole of the one-way overrunning clutch is sleeved on the transmission shaft, and the motion is transmitted between the first sprocket and the second sprocket through the chain.

[0024] In some embodiments, the suspension module further includes a brake and a reel support, the reel support is fixed to the bottom plate of the frame, the reel is fixedly sleeved on the reel shaft, and the reel shaft is rotatably connected to the reel support.

[0025] In some embodiments, each pulley group in the suspension module is respectively composed of two fixed pulleys and one movable pulley, all pulleys in a single suspension module are connected by a steel wire rope, the two fixed pulleys are arranged above the hanger of a matching energy storage submodule and are fixedly connected to the frame, the first fixed pulley and the second fixed pulley are rotatably mounted on the same fixed shaft; the hanger is provided with a connecting shaft, and the movable pulley is rotatably mounted on the connecting shaft of the hanger in a matching energy storage submodule; in a single pulley group, the steel wire rope passes through the first fixed pulley, the movable pulley and the second fixed pulley in sequence.

[0026] In some embodiments, the inter-group fixed pulley is fixed to the bottom plate of the rack, and the directions of the steel wire ropes in two adjacent groups of energy storage submodules are opposite through the inter-group fixed pulley.

[0027] A second aspect of the present disclosure provides a vacuum-gravity hybrid energy storage device for a new energy power generation system, comprising a control system and a plurality of energy storage workstations, each of which is connected to the control system via a control cable;

[0028] The energy storage workstation adopts the energy storage workstation according to any embodiment of the first aspect of the present disclosure;

[0029] The control system is used to open or close a corresponding number of the energy storage workstations according to the energy storage or release capacity requirements of the new energy power generation system, and to control and monitor the equipment status in each energy storage workstation.

[0030] In some embodiments, the control system includes an operation controller and a grid-connected control unit, a safety protection unit, a monitoring unit, a communication interface circuit, a user interface and a plurality of sensor units connected thereto; each sensor unit is respectively arranged in a corresponding energy storage workstation, including a speed sensor for detecting the speed of the generator motor, a distance sensor for detecting the position of the hanger and a force sensor for sensing the tension value of the wire rope; the grid-connected control unit is used to connect the electric energy generated by the energy storage device to the main power grid; the safety protection unit is used to deal with emergencies, and when the parameters exceed the preset working range, the energy storage workstation with problems is shut down in time; the monitoring unit is used to monitor the working status of the energy storage workstation in real time, and transmit the data to the operation controller, the safety protection unit and the communication interface circuit; protection unit and the user interface; the communication interface circuit is used to realize data communication during the operation of the energy storage device; the user interface is used to input user instructions, change parameters, and display the operating status, data and fault conditions of the energy storage workstation; the operation controller is used for operation monitoring of the energy storage workstation, including start and stop control, control of various electronic devices and power grid monitoring, wherein the operation controller adjusts the generator motor according to the speed detected by the speed sensor so that the speed of the generator motor runs within the set speed range, the operation controller senses the real-time energy storage or energy release margin of the energy storage module according to the distance detected by the distance measuring sensor to control the corresponding suspension module, and the operation controller also controls the corresponding suspension module according to the tension sensed by the force sensor.

[0031] In some embodiments, the operation process of the energy storage device includes:

[0032] During energy storage operation:

[0033] The control system opens a corresponding number of energy storage workstations according to the energy storage capacity requirements of the new energy power plant. In the opened energy storage workstations, the control system first connects the transmission route between the first energy storage module and the generator motor, releases the brake on the suspension module corresponding to the first energy storage module, and connects the power cable to start the generator motor. The vacuum volume of each vacuum element of the first energy storage module and the volume of the liquid storage tank for holding liquid increase linearly with the increase of the moving distance of the hanger. The liquid in the supporting guide cylinder in the vacuum energy storage mechanism flows into the liquid storage tank of the gravity energy storage mechanism. When the hanger reaches the first set position, it is determined that all energy storage sub-modules in the first energy storage module are at full load energy storage, then the suspension module corresponding to the first energy storage module is braked, and the transmission route between the first energy storage module and the transmission shaft is disconnected. The energy storage of the first energy storage module is completed, and the control system is in accordance with the first storage The same operation of the energy storage module is performed to start the remaining energy storage modules in sequence, until all the energy storage modules in the opened energy storage workstation have completed energy storage, and the control system disconnects the power cable and brakes the generator motor; if there is still surplus electric energy to be stored, the control system will continue to open the remaining energy storage workstations that have not achieved full-load energy storage, and when all energy storage workstations are fully loaded with energy storage, the energy storage operation is completed; when a single or part of the energy storage workstations are storing energy and there is an unexpected situation of no energy storage capacity, the control system disconnects the power cable to brake the generator motor, and at the same time brakes all the suspension modules that are storing energy and disconnects the transmission route between all the energy storage modules that are storing energy and the generator motor, and the energy storage operation of the energy storage workstation is suspended. If there is a subsequent energy storage requirement, the energy storage workstation whose energy storage operation is suspended will continue the energy storage operation until the full-load energy storage of the energy storage workstation is achieved, and finally the full-load energy storage of the energy storage device is achieved;

[0034] During energy release operation:

[0035] The control system opens a corresponding number of energy storage workstations according to the required energy release capacity. In the opened energy storage workstation, the control system first connects the power cable to start the generator motor. The control system first releases the brake on the suspension module corresponding to the first energy storage module in the energy storage workstation, and at the same time connects the transmission route between the first energy storage module and the generator motor. As the vacuum volume of each vacuum element of the first energy storage module decreases, the weight of the gravity energy storage mechanism gradually sinks into the liquid surface of the liquid storage tank, causing the liquid in the liquid storage tank to flow into the supporting guide cylinder of the vacuum energy storage mechanism, and drives the hanger to move downward, thereby releasing the wire rope from the drum through the corresponding movable pulley, so that the generator motor rotates to generate electricity. When the hanger in the first energy storage module reaches the second set position, it indicates that the current energy release of the first energy storage module has ended, and the control system brakes The suspension module corresponding to the first energy storage module is disconnected, and the transmission route between the first energy storage module and the transmission shaft is disconnected. The energy release of the first energy storage module is completed, and the control system releases the remaining energy storage modules in turn according to the same operation until all energy storage modules in the opened energy storage workstation have completed energy release, and the energy storage workstation has completed energy release; when the energy storage workstation is in the process of releasing energy and an unexpected situation occurs where energy release is not required, the control system first disconnects the power cable and brakes the generator motor, and at the same time brakes the suspension module that is releasing energy and disconnects the transmission route between all energy storage modules that are releasing energy and the generator motor, and the energy release operation of the energy storage workstation is suspended. If there is a subsequent energy release requirement, the energy storage workstation that has been suspended from releasing energy will continue to release energy until the full-load energy release of the energy storage workstation is achieved, and finally the full-load energy release of the energy storage device is achieved.

[0036] The present disclosure has the following features and beneficial effects:

[0037] The vacuum-gravity hybrid energy storage device provided in the present disclosure can be used as an energy storage device for new energy power plants, and can achieve large-capacity and multi-mode energy storage and release. Specifically, the energy storage capacity of the vacuum-gravity hybrid energy storage device can store the electric energy generated by the corresponding new energy power plant at full load within a certain period of time. When the output of the new energy power plant decreases due to natural reasons or the power generation is relatively small for a period of time, the vacuum-gravity hybrid energy storage device starts a single or a small number of energy storage stations to participate in power generation; in the vacuum-gravity hybrid energy storage device, a single or multiple energy storage stations can participate in energy storage or release at the same time, all energy storage stations can participate in energy storage or release at the same time, a single energy storage station can participate in energy storage or release in succession, and some energy storage stations can participate in energy storage or release in succession as a whole. This can not only ensure that the wind farm can still store energy in the case of light wind or changing wind speed or the photovoltaic power plant can still store energy in the case of low-intensity light or changing light intensity, but also the technical solution has the characteristics of a long energy release time, and can also meet the main power grid's requirements for the vacuum-gravity hybrid energy storage device to release electric energy with certain flexibility. More importantly, the new energy power plant does not directly supply electricity to the main power grid, but generates electricity and is connected to the grid through the vacuum-gravity hybrid energy storage device. The electric energy generated by the vacuum-gravity hybrid energy storage device can remain stable, thereby eliminating the adverse effects of new energy power generation on the main power grid and creating conditions for increasing the proportion of the above two types of new energy power generation in the power grid.

[0038] In addition, the present invention is based on the characteristics of the movable pulley, such as: two fixed pulleys and one movable pulley are installed in the pulley group corresponding to each energy storage submodule and connected by a steel wire rope. Although the total limit force of the entire energy storage module is very large, the maximum tension that the steel wire rope can withstand is only half of the limit force of a single energy storage submodule, which can greatly reduce the requirements for the strength of the steel wire rope. At the same time, the energy storage density of each energy storage module can be further improved by increasing the number of energy storage submodules and increasing the depth of the supporting guide cylinder below the liquid surface, and by increasing the number of vacuum elements and the length and mass of the weight in series in each energy storage submodule, thereby creating conditions for improving the integration and large-scale application of the energy storage device. Since all the liquids, such as water, are stored in containers, and a liquid storage tank is used as the water supply and drainage space of the vacuum energy storage mechanism, there is no need to build a ground regulating reservoir. Since there are many dead water areas in the low-lying areas of the reservoir that cannot be used, the reservoir must always maintain a certain head to ensure the water supply pressure. Considering the huge evaporation of the reservoir, the disclosure can reduce the amount of water used by at least one-half when it is initially put into use; in addition, end covers are provided at the top of the liquid storage tank and the position where the vacuum energy storage mechanism contacts the atmosphere, so that the evaporation of water is greatly reduced compared to the reservoir in subsequent use, and it can be widely used in arid and rainless areas. In addition, submerging the vacuum element in the liquid to a certain depth can make the pressure on the active end of the vacuum element greater than that directly exposed to the atmosphere, thereby increasing the energy storage density. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a top view schematic diagram of a vacuum-gravity hybrid energy storage workstation for a new energy power generation system provided by an embodiment of the first aspect of the present disclosure. Due to the limitation of the drawing width, some energy storage units and racks located on the upper side of the transmission shaft are omitted in this figure;

[0040] Figure 2 yes Figure 1 AA section side view in;

[0041] Figure 3 yes Figure 1 Schematic diagram of the structure of a single energy storage submodule;

[0042] Figure 4 It is a schematic diagram of the layout of a vacuum-gravity hybrid energy storage device for a new energy power generation system provided by an embodiment of the second aspect of the present disclosure;

[0043] Figure 5 yes Figure 4 A schematic diagram of the structure of the control system in the vacuum-gravity hybrid energy storage device shown;

[0044] Reference numerals:

[0045] 100-energy storage workstation, 110-suspension module, 111-brake, 112-drum shaft, 113-drum bracket, 114-drum, 115-wire rope, 116a-first fixed pulley, 116b-second fixed pulley, 117-intergroup fixed pulley, 118-moving pulley, 120-mechanical transmission module, 121-second clutch, 122-clutch bracket, 123-first sprocket, 124-chain, 125-second sprocket, 126-one-way super Clutch, 130-transmission shaft, 131-bearing, 140-energy storage module, 141-energy storage submodule, 141a-weight, 141b-liquid storage tank, 141c-vacuum element, 141d-support guide cylinder, 141e-hanging bracket, a-hanging beam, b-rope, c-connecting shaft, 150-first clutch, 160-transmission, 170-generator motor, 171-power cable, 180-frame, 181-bottom plate, 190-elastic coupling;

[0046] 200-control cable;

[0047] 300 - control system, 310 - sensing unit, 311 - speed sensor, 312 - distance sensor, 313 - force sensor, 320 - operation controller, 330 - grid-connected control unit, 340 - safety protection unit, 350 - monitoring unit, 360 - communication interface circuit, 370 - user interface. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0049] On the contrary, the present application covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present application as defined by the claims. Further, in order to make the public have a better understanding of the present application, some specific details are described in detail in the detailed description of the present application below. Those skilled in the art can fully understand the present application without the description of these details.

[0050] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the basis or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure. In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present disclosure, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0051] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0052] In the present disclosure, unless otherwise expressly specified and limited, a first feature being “above” or “below” a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being “above”, “above”, and “above” a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0053] See also Figures 1 to 3 , a vacuum-gravity hybrid energy storage workstation 100 for a new energy power generation system provided in an embodiment of the first aspect of the present disclosure includes a frame 180, and a transmission shaft 130, a first clutch 150, a transmission 160, a generator motor 170 and a plurality of energy storage modules 140 all located within the footprint of the frame 180, and each energy storage module 140 is respectively equipped with a suspension module 110 and a mechanical transmission module 120;

[0054] Each energy storage module 140 is connected to the transmission shaft 130 through the corresponding suspension module 110 and the mechanical transmission module 120 and is evenly arranged on both sides of the transmission shaft 130. A single energy storage module 140 has a plurality of energy storage submodules 141 arranged in an array, with the direction parallel to the transmission shaft 130 as a row and the direction perpendicular to the transmission shaft 130 as a column. The energy storage submodules 141 located in the same row or the same column are regarded as a group of energy storage submodules.

[0055] The energy storage submodule 141 includes a vacuum energy storage mechanism, a gravity energy storage mechanism and a hanger 141e; the vacuum energy storage mechanism includes a support guide cylinder 141d and a vacuum element 141c located therein, a closed chamber is formed inside the vacuum element 141c, one end of the vacuum element 141c is fixedly connected to one end of the support guide cylinder 141d, and the other end of the vacuum element 141c is a movable end connected to the hanger 141e. The movable end of the vacuum element 141c can move upward inside the support guide cylinder 141d under the traction of the hanger 141e, thereby forming a vacuum in the closed chamber inside the vacuum element 141c. state; the gravity energy storage mechanism includes a liquid storage tank 141b connected to the support guide cylinder 141d and a weight 141a located therein and connected to the hanger 141e, the weight 141a is close to the top of the liquid storage tank 141b, that is, located near the connection between the liquid storage tank 141b and the support guide cylinder 141d, the liquid storage tank 141b and the support guide cylinder 141d both contain liquid, and the weight 141a moves upward synchronously with the active end of the vacuum element 141c along the inner wall of the liquid storage tank 141b under the traction of the hanger 141e; when the energy storage submodule 141 is in the full load energy release state, the upper end surface of the weight 141a is connected to the upper end surface of the weight 141a. The liquid level in the liquid storage tank 141b is flush (this is the limit state. In actual use, a proper margin will be left so that the upper surface of the weight is slightly higher than the liquid level in the liquid storage tank 141b). The position of the upper surface of the hanger 141e at this time is taken as the second set position. As the weight 141a moves upward, the empty space in the liquid storage tank 141b is used to hold the liquid discharged from the support guide cylinder 141d by the vacuum element 141c. On the contrary, when the vacuum element 141c is under the action of the liquid pressure in the support guide cylinder 141d, the internal vacuum volume of the vacuum element 141c becomes smaller, causing the liquid level in the support guide cylinder 141d to drop. The moving and working weight 141a gradually sinks into the liquid level of the liquid storage tank 141b again, and the excess liquid in the liquid storage tank 141b is discharged into the guide support cylinder 141d, until the energy storage submodule 141 is in a full-load energy storage state, the lower end surface of the weight 141a is flush with the liquid level in the liquid storage tank 141b (this is an extreme state, and in actual use, a proper margin will be left so that the lower surface of the weight is slightly lower than the liquid level in the liquid storage tank 141b), the weight 141a, the movable end of the vacuum element 141c and the hanger 141e stop moving, and the position of the upper surface of the hanger 141e at this time is taken as the first set position;

[0056] The suspension module 110 is connected between the matching mechanical transmission module 120 and the energy storage module 140. The suspension module 110 includes a drum 114 wound with a wire rope 115, a plurality of pulley groups and a plurality of fixed pulleys 117 between groups. The drum 114 is supported in the frame 180. Each pulley group cooperates with a corresponding energy storage submodule 141 in the energy storage module 140. Each pulley group consists of a plurality of fixed pulleys fixed in the frame 180 and at least one movable pulley installed above the hanger 141e. A group of fixed pulleys is respectively configured between adjacent groups of energy storage submodules in the energy storage module 140. The fixed pulley 117 is used to change the direction of the steel wire rope 115 in the adjacent energy storage submodules; one end of the steel wire rope 115 is fixed on the drum 114, and the other end is fixedly connected to the frame 180 after passing through each pulley group and the fixed pulley 117 between groups in sequence; as the number of turns of the steel wire rope 115 wound on the drum 114 changes, each hanger 141e in the energy storage module 140 moves synchronously with the corresponding movable pulley, so that the pressure potential energy generated by the change of the vacuum volume of the closed chamber inside the vacuum element 141c and the gravitational potential energy generated by the movement of the weight 141a change synchronously, realizing energy storage and energy release;

[0057] The transmission shaft 130 is rotatably connected to the frame 180 through a bearing 131, one end of the transmission shaft 130 is connected to one end of the low-speed shaft of the transmission 160 through a first clutch 150, and one end of the high-speed shaft of the transmission 160 is connected to the generator motor 170 through an elastic coupling 190. The transmission 160 is used to greatly change the low speed of the transmission shaft 130 to the high speed required by the generator motor 170; the generator motor 170 is connected to the power cable of the new energy power generation system through the power cable 171.

[0058] In some embodiments, the energy storage workstation 100 includes a plurality of energy storage modules 140, the number of which is 4 to 10 and is an even number, usually 4 or 6. Each energy storage module 140 is respectively equipped with a suspension module 110 and a mechanical transmission module 120, and each energy storage module 140 and the matching suspension module 110 and mechanical transmission module 120 constitute a set of energy storage equipment, which can work on the transmission shaft 130 alone or work on the transmission shaft 130 together with other sets of energy storage equipment.

[0059] In some embodiments, in order to facilitate the arrangement of as many energy storage sub-modules 141 as possible within the footprint of the rack 180 so as to improve the energy storage density of the energy storage workstation 100, the bottom plate 181 of the rack 180 is usually designed to be rectangular. From a top-down perspective, the axis of the transmission shaft 130 is arranged at the position of the connecting line of the midpoints of the two long sides of the rectangular bottom plate 181, that is, the axis of the transmission shaft 130 is perpendicular to the long side of the bottom plate 181. Considering that the suspension module 110 and the mechanical transmission module 120 need to occupy a certain area, the energy storage sub-modules 141 are densely arranged at a certain distance on both sides of the axis of the transmission shaft 130, and the energy storage sub-modules 141 are divided into each energy storage module 140. The transmission shaft 130, the drum 114 and the mechanical transmission mechanism 120 are all arranged close to the bottom plate 181 of the frame 180, so that the wire rope 115 wound on the drum 114 can maintain a sufficient distance from the first fixed pulley in the pulley block (installed in the upper space of the frame 180), so that the drum 114 can properly arrange the rope when winding the wire rope 115. In a specific embodiment of the present disclosure, the bottom plate 181 of the frame 180 is divided into two by the axis of the transmission shaft 130, and two sets of energy storage devices are arranged on both sides of the transmission shaft 130, for a total of four sets.

[0060] In some embodiments, the vacuum element 141c in the vacuum energy storage mechanism forms a vacuum by moving part of its inner surface in at least one direction to enlarge the internal closed chamber, and the vacuum element 141c is filled with liquid around it. Due to the presence of the liquid column, a pressure potential energy exceeding the atmospheric pressure is formed, and the pressure potential energy is the position release energy generated by the pressure acting on the outer surface of the vacuum element 141c. Preferably, the vacuum element 141c adopts a folding or telescopic structure; for example, the vacuum element 141c uses a closed chamber in the form of a flexible bellows with foldable side walls, or the vacuum element 141c uses a telescopic closed chamber with side walls formed by sequential nesting, or the vacuum element 141c uses a closed chamber in the form of a piston cylinder.

[0061] Furthermore, depending on the usage scenario, the vacuum energy storage mechanism and the gravity energy storage mechanism can be selected to be buried underground or set on the ground. For example, for areas with deeper underground rock formations, the support guide cylinder 141d of the vacuum energy storage mechanism and the liquid storage tank 141b of the gravity energy storage mechanism adopt a vertical shaft structure buried underground, and the lower end burial depth of the support guide cylinder 141d and the liquid storage tank 141b is generally set to 50 to 600 meters. Try not to drill wells in the underground rock formation, which will cause a sharp increase in construction costs. For areas with shallower underground rock formations, the support guide cylinder 141d of the vacuum energy storage mechanism and the liquid storage tank 141b of the gravity energy storage mechanism adopt a vertical cylindrical structure set on the ground and fixedly connected to the frame 180, and the upper end of the support guide cylinder 141d and the liquid storage tank 141b of the gravity energy storage mechanism is generally set to 20 to 100 meters above the ground.

[0062] Further, see Figure 3In a single energy storage submodule 141, the hanger 141e includes a hanging beam a and a plurality of ropes b connected to the hanging beam a, the bottom end of the rope b is fixedly connected to the movable end of the vacuum element 141c or the top end of the weight 141a, and the hanging beam a is also provided with a connecting shaft c, and the movable pulley in the pulley group matching the energy storage submodule 141 is rotatably mounted on the connecting shaft c, so that the hanger 141 is driven to move synchronously by the up and down movement of the movable pulley; the total vacuum volume that the vacuum element 141c can increase is equal to the volume difference between the initial and final immersion of the weight 141a in the liquid in the liquid storage tank 141b (that is, the total volume of the liquid discharged from the liquid storage tank 141b). During the energy storage operation, the vacuum element 141c rises due to the increase of the internal vacuum volume on the upper surface, while the pressure of the liquid on the movable end surface decreases, that is, the force acting on the hanger 141e by the vacuum element 141c gradually decreases, and at the same time, as the volume of the weight 411a exposed above the liquid surface becomes larger and larger, the gravity from the weight 141a borne by the hanger 141e gradually increases. By using the principle that the buoyancy of the liquid on the object is equal to the gravity of the part of the liquid it excludes, as long as the total volume of the vacuum element 141c in the energy storage submodule 141 is equal to the volume difference between the initial immersion of the weight 141a in the liquid and the final immersion in the liquid, and at the same time, in this energy storage submodule 141, as the weight 141a is continuously exposed from the liquid in the liquid storage tank 141b, the liquid gradually flows into the liquid storage tank 141b from the support guide cylinder 141d, and the force borne by the energy storage submodule 141 always remains stable, so that the load of the generator motor 170 remains basically unchanged. On the contrary, during the energy release operation, as the weight 141a in the energy storage submodule 141 gradually sinks into the liquid in the liquid storage tank 141b, the buoyancy effect on the weight 141a gradually increases, and the gravity exerted by the weight 141a on the hanger 141e gradually decreases. At the same time, the liquid in the liquid storage tank 141b is gradually discharged into the supporting guide cylinder 141d, the pressure on the upper surface of the vacuum element 141c gradually increases, and the force exerted by the vacuum element 141c on the hanger 141e gradually increases. By utilizing the principle that the buoyancy of liquid on an object is equal to the gravity of the part of the liquid it removes, as long as the total volume of the vacuum element in the energy storage submodule is equal to the volume difference between the initial immersion of the weight in the liquid and the final immersion in the liquid, the force borne by the energy storage submodule always remains stable, and thus the power generation power of the generator motor 170 is also basically stable. In order to keep the liquid level fixed, it is required that when the energy storage submodule 141 is in full load energy storage, the limit position of the upward movement of the weight is that the lower surface of the weight 141a is flush with the liquid level in the liquid storage tank 141b or the weight is just completely out of the liquid surface, and when the energy storage submodule 141 is in full load energy release, the limit position of the downward movement of the weight is that the upper surface of the weight 141a is flush with the liquid level in the liquid storage tank 141b or the weight is just submerged in the liquid surface.Of course, when the energy storage operation state is not fully loaded, a part of the weight 141a is still below the liquid surface when the energy storage is completed, and a part of the weight 141a is still above the liquid surface when the energy release is completed. This operation mode is also allowed, and the stability of the force applied to the energy storage submodule by adjusting and maintaining the buoyancy change of the weight 141a will not be affected, but it will affect the maximum energy storage effect of the vacuum energy storage mechanism and the gravity energy storage mechanism.

[0063] Furthermore, in order to reduce the volatilization of the liquid in the energy storage submodule 141, end covers are provided at the top of the liquid storage tank 141b and the supporting guide cylinder 141d. A first hole matching the outer contour of the weight 141a is reserved on the end cover of the liquid storage tank 141b, so that the weight 141a can just pass through the first hole during the movement of the hanger 141e; a second hole is reserved on the end cover of the supporting guide cylinder 141d for the lower part of the hanger 141e to pass through.

[0064] Furthermore, in a single energy storage submodule 141, there are provided one heavy object energy storage mechanism and one to eight vacuum energy storage mechanisms. When multiple vacuum energy storage mechanisms are provided, the circumferences of the vacuum energy storage mechanisms are evenly distributed on the periphery of the gravity energy storage mechanism, and the support guide cylinders 141d in each vacuum energy storage mechanism are connected to the liquid storage tank 141b in the gravity energy storage mechanism. In a single vacuum energy storage mechanism, one or more vacuum elements 141c connected in series may be provided, from bottom to top, the fixed end of the vacuum element at the bottom is fixedly connected to the support guide cylinder 141d, the movable end of the vacuum element at the bottom is directly fixedly connected to the fixed end of the vacuum element at the top or fixedly connected by a wire rope or a connecting rod, and the movable end of the vacuum element at the top is fixedly connected to the bottom end of the hanger. The use of the vacuum element series mode can increase the stroke of vacuum energy storage or energy release, and also simultaneously increase the stroke of heavy object energy storage or energy release, thereby increasing the energy storage density.

[0065] In some embodiments, each mechanical transmission module 120 in the energy storage workstation 100 is connected between the corresponding suspension module 110 and the transmission shaft 130, and the suspension module 110 is connected to a corresponding energy storage module 140, thereby realizing power transmission between the energy storage module 140 and the transmission shaft 130. Optionally, each mechanical transmission module 120 respectively includes a second clutch 121, a clutch bracket 122, a first sprocket 123, a chain 124, a second sprocket 125 and a one-way overrunning clutch 126; the second clutch 121 is connected to the reel 114 in the suspension module 110, the second clutch 121 and the first sprocket 123 are supported by the clutch bracket 122, the clutch bracket 122 is fixedly connected to the bottom plate 181 of the frame 180, the outer cylindrical surface of the one-way overrunning clutch 126 cooperates with the inner hole of the second sprocket 125, the inner hole of the one-way overrunning clutch 126 is sleeved and connected to the transmission shaft 130, and the motion is transmitted between the first sprocket 123 and the second sprocket 125 through the chain 124. The mechanical transmission module 120 matched with each energy storage module 140 can not only transmit the rotation of the transmission shaft 130 to the energy storage module 140 to increase its pressure potential energy and gravity potential energy, but also transmit the torque of the pressure potential energy and gravity potential energy of the energy storage module 140 on the reel 114 in the suspension module 110 to the transmission shaft 130. Specifically, when energy storage is required, the transmission shaft 130 rotates the second sprocket 125 through the one-way overrunning clutch 126, the second sprocket 125 rotates the first sprocket 123 through the chain 124, and the first sprocket 123 rotates the reel 114 in the suspension module 110 through the second clutch 121, so that the pressure potential energy of the vacuum element 141c in the energy storage module 140 increases, and at the same time, as the weight 141a is lifted, its gravity potential energy also increases synchronously; when energy release is required, the transmission route of the mechanical transmission module 120 is exactly opposite to that when storing energy. The connection and disconnection between the suspension module 110 and the transmission shaft 130 are realized by the switch of the second clutch 121, so as to selectively connect the corresponding energy storage module 140 to participate in energy storage or energy release. Specifically, when the energy storage is finished, the energy storage module 140 that has stored energy at full load is first braked, and at the same time, the second clutch 121 in the mechanical transmission module 120 is disengaged from the reel 114, so that the reel 114 is disconnected from the first sprocket 123 in the mechanical transmission module 120 to avoid damage to the mechanical transmission module 120; when the energy storage module 140 is not needed to continue to work on the transmission shaft 130, the first sprocket 123 in the mechanical transmission module 120 is also disengaged from the reel 114 through the second clutch 121 to avoid the energy storage module 140 continuing to work on the transmission shaft 130, so that the speed of the transmission shaft 130 is out of control. The second clutch 121 generally adopts an electromagnetic friction clutch or an electromagnetic tooth clutch, and in this embodiment, an electromagnetic friction clutch is preferably used. The chains 124 in each mechanical transmission module 120 in the energy storage workstation 100 are of the same size, which is conducive to standardized production.

[0066] It can be understood that the mechanical transmission module 120 of this embodiment uses a first sprocket 123, a chain 124 and a second sprocket 125 for transmission between the energy storage module 140 and the transmission shaft 130, that is, a sprocket chain transmission method is adopted. This method can transmit a larger torque, the transmission process is smoother and there is no loss of rotation; when transmitting a larger torque, gear transmission can be used instead of sprocket chain transmission; when transmitting a smaller torque, a synchronous toothed belt transmission can be used instead of a chain transmission to reduce noise and make the transmission smoother.

[0067] Furthermore, the one-way overrunning clutch 126 is also called a one-way bearing, and can be a spherical, wedge-shaped or tooth-shaped one-way overrunning clutch. In this embodiment, a spherical one-way overrunning clutch is preferred.

[0068] It is understandable that the setting of the one-way overrunning clutch 126 in this embodiment can avoid the influence of the braking of one or more energy storage modules 140 on the other energy storage modules 140 not being braked to continue to work on the transmission shaft 130. Specifically, when the energy release of the first energy storage module in the energy storage workstation 100 is about to end, the energy release starts from the second energy storage module. Due to the use of the one-way overrunning clutch 126, the mechanical transmission module matched with the first energy storage module will not be decelerated or the suspension mechanism will be braked, which will affect the effect of the mechanical transmission module matched with the second energy storage module on the transmission shaft 130. In particular, the mechanical transmission module corresponding to the energy storage module not participating in the energy release will not cause the efficiency of the energy storage workstation 100 to decrease when releasing energy as the transmission shaft 130 is idling.

[0069] In some embodiments, the suspension module 110 further includes a brake 111 and a reel support 113. The reel support 113 is fixed on the bottom plate 181 of the frame 180. The reel 114 is fixedly sleeved on the reel shaft 112. The reel shaft 112 is rotatably connected to the reel support 113 through a bearing. The axial direction of the reel shaft 112 is preferably parallel to the axial direction of the transmission shaft 130. The brake 111 is connected to the reel shaft 112 to control the rotation of the reel 114. When the energy storage module 140 is not required to participate in energy storage or energy release, the brake 111 is used to brake the reel 114 while the second clutch 121 is used to disconnect the transmission shaft 130 from the reel 114, so that the reel 114 stops rotating, thereby maintaining the current state of each vacuum element 141c and the weight 141a in the matching energy storage module 140 unchanged. The brake 111 may be in the form of an electromagnetic power-off brake, a drum brake, a butterfly brake, a tooth brake, etc., and preferably an electromagnetic power-off brake is used.

[0070] Preferably, the structures of the pulley groups in the suspension module 110 are the same, and each pulley group is respectively composed of two fixed pulleys (116a, 116b) and one movable pulley 118. Assuming that the number of rows of the energy storage submodules 141 in the energy storage module 140 is n, and the number of columns is j (wherein the value of j needs to be considered that when it is too large, the arrangement of the energy storage submodules 141 in one energy storage module 140 will affect the two adjacent energy storage modules 140, and the value of n can be relatively large, but a too large value will cause the steel wire rope 115 to pass through too many pulley groups and be subject to obvious friction resistance), then the number of fixed pulleys in all the pulley groups used by the suspension module 110 to pull the energy storage module 140 is 2×n×j, and the number of movable pulleys is n×j. All the pulleys in a single suspension module 110 are connected by a steel wire rope 115. Each pulley block is arranged above the hanger 141e of a matching energy storage submodule 141, the planes where the two fixed pulleys are located are parallel and fixed on the frame 180 above the movable pulley 118, and one movable pulley 118 is rotatably mounted on the connecting shaft c of the hanger 141e. In a single pulley block, the wire rope 115 passes through the first fixed pulley 116a, the movable pulley 118 and the second fixed pulley 116b in sequence.

[0071] See also Figure 1 The direction of the steel wire rope 115 between the drum 114 and the energy storage module 140 is as follows: one end of the steel wire rope 115 is wound on the drum 114, and the other end starts from the energy storage submodule of the first column and the first row in the energy storage module 140, passes through the first fixed pulley 116a, the first movable pulley 118, and the second fixed pulley 116b corresponding to the energy storage submodule in sequence, and then passes through the corresponding pulley group in the energy storage submodule of the first column and the second row, and passes through the pulley group corresponding to each energy storage submodule in the first column in sequence, until it is led out from the second fixed pulley 116b of the energy storage submodule in the last row of the first column, and then passes around the inter-group fixed pulley 117 connected to the bottom plate 181 of the rack 180 between the first column and the second column. , the wire rope 115 starts to turn and is introduced into the pulley group corresponding to the last row of the energy storage submodule in the second column, and then follows the opposite direction of the wire rope 115 in the first column, that is, from the pulley group corresponding to the last row of the energy storage submodule in the second column, it passes through each energy storage submodule in the second column in sequence until it is led out from the pulley group corresponding to the first row of the energy storage submodule in the second column, and is turned from the inter-group fixed pulley 117 between the second and third columns to be introduced into the pulley group corresponding to the first row of the energy storage submodule in the third column, and so on. Before each column change, it is necessary to bypass the inter-group fixed pulley 117 between the two adjacent columns until it is led out from the corresponding pulley of the last energy storage submodule in the last column and fixedly connected to the bottom plate 181 of the rack 180. It should be noted that Figure 1 The inter-group fixed pulley 117 shown is arranged between two adjacent columns of energy storage sub-modules. In this case, each column of energy storage sub-modules is regarded as a group. The inter-group fixed pulley 117 can also be arranged between two adjacent rows of energy storage sub-modules, that is, each row of energy storage sub-modules is regarded as a group, which is also applicable to the present application.

[0072] In some embodiments, in order to ensure that the force on the transmission shaft 130 is as uniform as possible and to facilitate production, the layout of each energy storage module 140 in the energy storage station 100 is exactly the same. Figure 1 It can be seen that the arrangement of the energy storage submodules 141 is preferably a rectangular array, which is convenient for arranging the pulley block and passing the wire rope 115.

[0073] See also Figure 4 , Figure 5 The second aspect of the present disclosure provides a vacuum-gravity hybrid energy storage device for a new energy power generation system, comprising a control system 300 and a plurality of energy storage workstations 100, each of which is connected to the control system 300 via a control cable 200; each of the energy storage workstations 100 adopts Figure 1 to Figure 3 The energy storage workstation control system 300 shown is used to open or close a corresponding number of energy storage workstations 100 according to the energy storage or release capacity requirements of the new energy power generation system, and to control and monitor the equipment status in each energy storage workstation 100.

[0074] Furthermore, the control system 300 controls the working mode of each energy storage workstation 100 according to the energy storage and release instructions of the new energy power generation system: when the power generation of the new energy power generation site is relatively small, the new energy power generation system instruction control system 300 starts a single or a few energy storage workstations 100 to participate in energy storage; when the power generation of the new energy power generation site is close to full load, the new energy power generation system instruction control system 300 starts all energy storage workstations 100 to participate in energy storage at the same time; when the power generation of the new energy power generation site gradually increases, the new energy power generation system instruction control system 300 starts a single or multiple energy storage workstations 100 to participate in energy storage one after another.

[0075] In some embodiments, the number of energy storage workstations 100 included in the vacuum-gravity hybrid energy storage device may be 3 or more, or even hundreds, to achieve full absorption of new energy (such as wind power and photovoltaic) power generation. When the power grid has a demand, the control system 300 enables the energy storage devices with different energy storage capacities and quantity combinations in each energy storage workstation 100 to work on their respective transmission shafts 130, so that the vacuum-gravity hybrid energy storage device can generate electricity steadily for a long time within a certain power range, thereby achieving stable power supply to the power grid in an artificially controllable manner.

[0076] In some embodiments, the control system 300 includes a plurality of sensor units 310, an operation controller 320, a grid-connected control unit 330, a safety protection unit 340, a monitoring unit 350, a communication interface circuit 360, and a user interface 370. Among them, each sensor unit 310 is respectively arranged in a corresponding energy storage workstation 100, and each includes a speed sensor 311, a distance sensor 312, and a force sensor 313. The speed sensor 311 is connected to the main shaft of the generator motor 170 and is used to measure the speed of the generator motor 170. The distance measuring sensor 312 is used to measure the position of the upper surface of the suspension beam a in the hanger 141e to sense the real-time energy storage or energy release margin of the energy storage module 140; during energy storage operation, when the distance measured by the distance measuring sensor 312 indicates that the energy storage has been fully loaded, the control operator 320 uses the brake 111 to brake the reel 114 in the suspension module 110, and at the same time controls the second clutch 121 to disengage the transmission chain between the transmission shaft 130 and the suspension module 110; during energy release operation, when the distance measured by the distance measuring sensor 312 indicates that the energy release has been fully loaded, the control operator 320 uses the brake 111 to brake the reel 114 in the suspension module 110, and at the same time controls the second clutch 121 to disengage the transmission chain between the transmission shaft 130 and the suspension module 110. The force sensor 313 is connected between the end of the wire rope 115 and the bottom plate 181 of the frame 180, and is used to measure the tension on the wire rope 115, so as to determine whether the energy storage device is stuck or the wire rope is broken, or to reflect whether the tension changes within a specified range and whether it is consistent with the working process; when the tension value measured by the force sensor 313 is abnormal, the control operator 320 uses the brake 111 to brake the drum 114 in the suspension module 110, and controls the second clutch 121 to disengage the transmission chain between the transmission shaft 130 and the suspension module 110. The grid-connected control unit 330 is used to connect the electric energy generated by the vacuum-gravity hybrid energy storage device to the main power grid. The safety protection unit 340 is used to deal with emergencies. When the parameters exceed the preset working range, such as when the motor speed exceeds the predetermined value or the distance trend reflected by the distance sensor 312 is inconsistent with the tension trend of the wire rope 115 reflected by the force sensor 313, the brake 111 is promptly turned on, the first clutch 150 and the second clutch 121 are disconnected, and the energy storage workstation 100 with problems is turned off. The monitoring unit 350 is used to monitor the working status of the suspension module 110 and the energy storage module 140 in real time, and transmit the data to the operation controller 320, the safety protection unit 340 and the user interface 370. The communication interface circuit 360 is used for data communication during the working process of the vacuum-gravity hybrid energy storage device of this embodiment, including but not limited to data communication between the control system 300 and the energy storage workstation 100, and data communication and control signals between the operation controller 320 and the sensor unit 310, the brake 111, the second clutch 121, the first clutch 150 and the generator motor 170.The user interface 370 is used to input user instructions, change parameters, and display the operating status, data, and faults of the energy storage workstation 100; the human-computer interaction and display functions of the user interface 370 are realized through the computer user display system and the real-time tracing system. As the center of the control system 300, the operation controller 320 is connected with the sensor unit 310, the grid-connected control unit 330, the safety protection unit 340, the monitoring unit 350, the communication interface circuit 360, and the user interface 370, and plays the role of operation monitoring, including the start and stop of the energy storage workstation 100, the control of other functional modules, and the grid-connected monitoring; the operation controller 320 mainly realizes these functions through a programmable controller. In addition, the operation controller 320 of the control system 300 is connected to various sensors in the energy storage workstation 100 through the control cable 200, and is also connected to the brake 111, the second clutch 121, the first clutch 150, and the generator motor 170 to realize the control of the working mode of the energy storage workstation 100 and the monitoring of the working status.

[0077] In some embodiments, the operation process of the vacuum-gravity hybrid energy storage device includes:

[0078] During energy storage operation: the control system 300 activates the energy storage devices in the corresponding number of energy storage workstations 100 according to the energy storage capacity requirements of the new energy power plant. Among the energy storage devices in the activated energy storage workstations 100, the control system 300 first activates the first energy storage module 140: firstly, the second clutch 121 and the first clutch 150 are activated, and then the brake 111 on the reel 114 is released, and at the same time, the power cable 171 is activated to start the generator motor 170, and the transmission 160 is used to increase the torque to drive the transmission shaft 130, and the transmission shaft 130 transmits the torque to the suspension module 1 through the mechanical transmission module 120. 10: The transmission shaft 130 rotates the second sprocket 125 through the one-way overrunning clutch 126 thereon, and the second sprocket 125 rotates the first sprocket 123 through the chain 124, and the first sprocket 123 rotates the drum 114 through the second clutch 121, so that the drum 114 winds the wire rope 115. After the drum 114 winds the wire rope 115, in each energy storage submodule 141, the movable pulley 118 is pulled, so that the hanger 141e moves upward, and at the same time, the vacuum volume inside the vacuum element 141c increases to form pressure potential energy, and the weight 141a moves upward synchronously to generate gravity potential energy, supporting the guide cylinder The liquid in 141d gradually flows into the liquid storage tank 141b. When the control system 300 senses through the distance measuring sensor 312 that all the hangers 141e in the energy storage module 140 have reached the first set position, it is determined that all the energy storage submodules 141 in the energy storage module 140 are in full load energy storage, and the reel 114 is braked by the brake 111, and the second clutch 121 is disengaged from the transmission connection of the transmission shaft 130, then the energy storage of the first energy storage module ends, and at the same time, the brake 111 in the suspension module 110 matched with the second energy storage module releases the brake on the reel 114, and the mechanical energy storage mode is closed. The second clutch 121 in the block 120 is connected, and the transmission shaft 130 stores energy in the second energy storage module 140 through the mechanical transmission module 120, and so on until all the energy storage modules 140 in the energy storage workstation 100 have completed energy storage. The control system 300 first disconnects the power cable 171 of the generator motor 170 to brake the generator motor 170; if there is still surplus electric energy to be stored, the control system 300 continues to open the energy storage devices in the remaining energy storage workstations 100 until all the energy storage workstations 100 of the entire vacuum-gravity hybrid energy storage device are fully loaded with energy, and the energy storage operation is completed;When a single or part of the energy storage workstation 100 is storing energy and unexpectedly has no energy storage capacity, the control system 300 disconnects the power cable 171 of the generator motor 170 to brake the generator motor 170, and at the same time brakes all the energy storage modules 140 that are storing energy and disengages the second clutch 121 and the first clutch 150, and the energy storage operation of the energy storage workstation 100 is suspended. If there is a subsequent energy storage requirement, the energy storage workstation 100 whose energy storage operation is suspended continues the energy storage operation until the energy storage workstation 100 achieves full-load energy storage, and finally achieves full-load energy storage of the vacuum-gravity hybrid energy storage device;

[0079] During the energy release operation: the control system 300 opens a corresponding number of energy storage workstations 100 according to the required energy release capacity. In the opened energy storage workstations 100, the control system 300 first connects the power cable 171 to start the generator motor 170. The control system 300 first releases the brake of the suspension module 110 corresponding to the first energy storage module 140 in the energy storage workstation 100, and at the same time connects the second clutch 121 in the matching mechanical transmission module 120 and connects the first clutch 150 between the transmission shaft 130 and the transmission 160. The gravitational potential energy generated by the downward movement of the weight 141a of each energy storage submodule 141 of the energy storage module 140 and the pressure potential energy generated by the vacuum element 141c due to the reduction of its vacuum volume, At the same time, the weight 141a gradually sinks into the liquid surface of the liquid storage tank 141b, so that the liquid in the liquid storage tank 141b flows into the supporting guide cylinder 141d of the vacuum energy storage mechanism, so that the movable end of the vacuum element 141c is still subjected to a large pressure, and the hanger 141e moves downward together with the movable end of the vacuum element 141c and the weight 141a, and the wire rope 115 is pulled by the corresponding movable pulley 118, and the wire rope 115 wound on the drum 114 is released. The drum 114 is pulled by the wire rope 115 and transmits the torque to the transmission shaft 130 through the second clutch 121, the first sprocket 123, the chain 124, the second sprocket 125 and the one-way overrunning clutch 126 in the mechanical transmission module 120 in sequence. 30 The motion is transmitted to the low-speed shaft of the transmission 160 through the first clutch 150, and then transmitted to the generator motor 170 through its high-speed shaft, thereby driving the generator motor 170 to rotate and generate electricity. The vacuum volume inside each vacuum element 141c of the first energy storage module becomes smaller, and the weight 141a gradually drops. When the hanger in the first energy storage module 140 drops to reach the second set position, it indicates that the first energy storage module 140 is fully loaded and released. Then the control system 300 controls its matching brake 111 to brake the reel 114 and the second clutch 121 is disengaged. At the same time, before the brake 111 of the first energy storage module 140 brakes the reel 114, the second energy storage module 140 has a small lead time in time. Energy release begins to ensure that the generator motor 170 generates electricity smoothly; since the element of the mechanical transmission module 120 of the first energy storage module 140 that connects the transmission shaft 130 is a one-way overrunning clutch 126, the mechanical transmission module 120 of the second energy storage module 140 after the first energy storage module 140 has released energy alone will not hinder the rotation of the transmission shaft 130; until all energy storage modules 140 in the energy storage workstation 100 have released energy, the control system 300 disconnects the power cable 171 of the generator motor 170 in the energy storage workstation 100 to brake the generator motor 170, all reels 114 are braked by the brake 111, all second clutches 121 are disengaged, and the energy release of the energy storage workstation 100 ends;If the vacuum-gravity hybrid energy storage device still has energy release requirements, the control system 300 opens the remaining energy storage workstations 100 that have not released energy, and continues to release energy according to the above energy release mode until the entire vacuum-gravity hybrid energy storage device achieves full-load energy release; when a single or part of the energy storage workstations 100 are in the process of releasing energy, and unexpectedly no energy release is required, the control system 300 first disconnects the power cable 171 to brake the generator motor 170, and at the same time brakes the energy storage module 140 in the energy storage workstation 100 that is releasing energy, and the vacuum element 141c and the weight 141a stop at the current position, and the energy release operation is suspended. If there is a subsequent energy release requirement, the energy storage workstation 100 whose energy release operation is suspended continues the energy release operation to achieve full-load energy release of the energy storage workstation 100, and finally the vacuum-gravity hybrid energy storage device achieves full-load energy release. ;

[0080] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0081] Although embodiments of the present disclosure have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the present disclosure, the scope of which is defined by the claims and their equivalents.

Claims

1. A vacuum-gravity hybrid energy storage workstation for a new energy power generation system, characterized in that: It includes a frame, and a transmission shaft, a first clutch, a transmission, a generator motor and a plurality of energy storage modules all located within the area covered by the frame, and each energy storage module is respectively equipped with a suspension module and a mechanical transmission module; Each energy storage module is connected to the transmission shaft through the corresponding suspension module and the mechanical transmission module and is evenly arranged on both sides of the transmission shaft. A single energy storage module has a plurality of energy storage sub-modules arranged in an array, with the direction parallel to the transmission shaft as the row and the direction perpendicular to the transmission shaft as the column. The energy storage sub-modules in the same row or column are regarded as a group of energy storage sub-modules. The energy storage submodule comprises a vacuum energy storage mechanism, a gravity energy storage mechanism and a hanger; the vacuum energy storage mechanism comprises a support guide cylinder and a vacuum element located therein, a closed chamber is formed inside the vacuum element, one end of the vacuum element is fixedly connected to one end of the support guide cylinder, and the other end of the vacuum element is a movable end connected to the hanger; the gravity energy storage mechanism comprises a liquid storage tank communicated with the support guide cylinder and a weight located in the liquid storage tank and connected to the hanger, the liquid storage tank and the support guide cylinder both contain liquid, and in the process in which the weight and the movable end of the vacuum element follow the synchronous movement of the hanger, the liquid flows between the liquid storage tank and the support guide cylinder, and at least one surface of the weight is in contact with the liquid, and the movable end of the vacuum element is continuously subjected to the pressure from the liquid; The suspension module is connected between the matching mechanical transmission module and the energy storage module, and the suspension module includes a drum wound with a steel wire rope, a plurality of pulley groups and a plurality of inter-group fixed pulleys. The drum is supported in the frame, and each pulley group cooperates with a corresponding energy storage submodule in the energy storage module, each pulley group consists of at least two fixed pulleys and at least one movable pulley, and one inter-group fixed pulley is respectively arranged between adjacent groups of energy storage submodules in the energy storage module; one end of the steel wire rope is fixed on the drum, and the other end is fixedly connected to the frame after passing through each pulley group and the inter-group fixed pulley in sequence; as the number of turns of the steel wire rope wound on the drum changes, each hanger in the energy storage module moves synchronously with the corresponding movable pulley, so that the pressure potential energy generated by the change of the vacuum volume of the closed chamber inside each vacuum element and the gravitational potential energy generated by the movement of each heavy object change synchronously, thereby realizing energy storage and energy release; The transmission shaft is rotatably connected to the frame, one end of the transmission shaft is connected to one end of the transmission through the first clutch, and the other end of the transmission is connected to the generator motor through an elastic coupling. The transmission matches the speed difference between the transmission shaft and the set speed of the generator motor, and the generator motor is connected to the power cable of the new energy power generation system through a power cable.

2. The energy storage workstation according to claim 1, characterized in that: The vacuum element forms a vacuum by moving a portion of its inner surface in at least one direction to enlarge the internal closed chamber, and forms pressure potential energy exceeding the atmospheric pressure under the pressure of the liquid. The pressure potential energy is the positional release energy generated by the pressure acting on the outer surface of the vacuum element.

3. The energy storage workstation according to claim 1, characterized in that: The vacuum element is foldable or telescopic; the weight is located near the connection between the liquid storage tank and the support guide cylinder; The support guide cylinder and the liquid storage tank adopt a vertical shaft structure buried underground or a vertical cylindrical structure arranged on the ground and fixedly connected to the frame.

4. The energy storage workstation according to claim 1, characterized in that: In the energy storage submodule, the total vacuum volume that can be increased by the vacuum element is equal to the volume of liquid discharged from the liquid storage tank during the process from the initial immersion of the weight to the final immersion of the weight into the liquid of the liquid storage tank; During energy storage operation, the liquid flows from the support guide cylinder into the liquid storage tank, and when the energy storage submodule is in full load energy storage, the lower surface of the weight is not higher than the liquid level in the liquid storage tank; During the energy release operation, the liquid flows from the liquid storage tank into the support guide cylinder. When the energy storage submodule is in full load energy release, the upper surface of the weight is not lower than the liquid level in the liquid storage tank.

5. The energy storage workstation according to claim 1, characterized in that: The number of the energy storage modules is 4 to 10 and is an even number; In a single energy storage submodule, 1 to 8 vacuum energy storage mechanisms are provided. When multiple vacuum energy storage mechanisms are provided, the circumferences of the vacuum energy storage mechanisms are evenly distributed on the periphery of the gravity energy storage mechanism. In a single vacuum energy storage mechanism, one or more vacuum elements connected in series are provided.

6. The energy storage workstation according to claim 1, characterized in that: The transmission shaft, the reel and the mechanical transmission mechanism are all arranged close to the bottom plate of the frame, and the transmission shaft is perpendicular to the long side of the bottom plate.

7. The energy storage workstation according to claim 1, characterized in that: The mechanical transmission module adopts a sprocket chain transmission method, a gear transmission method or a synchronous toothed belt transmission method to realize the mechanical transmission between the transmission shaft and the energy storage module.

8. The energy storage workstation according to claim 1, characterized in that: The mechanical transmission module includes a second clutch, a clutch bracket, a first sprocket, a chain, a second sprocket and a one-way overrunning clutch; the second clutch is connected to the reel, the second clutch and the first sprocket are supported on the bottom plate of the frame through the clutch bracket, the outer cylindrical surface of the one-way overrunning clutch cooperates with the inner hole of the second sprocket, the inner hole of the one-way overrunning clutch is sleeved on the transmission shaft, and the motion is transmitted between the first sprocket and the second sprocket through the chain.

9. The energy storage workstation according to claim 1, characterized in that: The suspension module also includes a brake and a reel support, the reel support is fixed to the bottom plate of the frame, the reel is fixedly sleeved on the reel shaft, and the reel shaft is rotatably connected to the reel support.

10. The energy storage workstation according to claim 1, characterized in that: Each pulley group in the suspension module is respectively composed of two fixed pulleys and one movable pulley, all the pulleys in a single suspension module are connected by a steel wire rope, the two fixed pulleys are arranged above the hanger of a matching energy storage submodule and are fixedly connected to the frame, the first fixed pulley and the second fixed pulley are rotatably mounted on the same fixed shaft; the hanger is provided with a connecting shaft, and the movable pulley is rotatably mounted on the connecting shaft of the hanger in a matching energy storage submodule; in a single pulley group, the steel wire rope passes through the first fixed pulley, the movable pulley and the second fixed pulley in sequence.

11. The energy storage workstation according to claim 1, characterized in that: The inter-group fixed pulley is fixed on the bottom plate of the frame, and the directions of the steel wire ropes in two adjacent groups of energy storage submodules are opposite through the inter-group fixed pulley.

12. A vacuum-gravity hybrid energy storage device for a new energy power generation system, characterized in that: It includes a control system and a plurality of energy storage workstations, each of which is connected to the control system via a control cable; The energy storage workstation adopts the energy storage workstation according to any one of claims 1 to 11; The control system is used to open or close a corresponding number of the energy storage workstations according to the energy storage or release capacity requirements of the new energy power generation system, and to control and monitor the equipment status in each energy storage workstation.

13. The energy storage device according to claim 12, characterized in that: The control system includes an operation controller and a grid-connected control unit, a safety protection unit, a monitoring unit, a communication interface circuit, a user interface and a plurality of sensor units connected thereto; each sensor unit is respectively arranged in a corresponding energy storage workstation, including a speed sensor for detecting the speed of the generator motor, a distance sensor for detecting the position of the hanger and a force sensor for sensing the tension value of the wire rope; the grid-connected control unit is used to connect the electric energy generated by the energy storage device to the main power grid; the safety protection unit is used to deal with emergencies, and when the parameters exceed the preset working range, the energy storage workstation with problems is shut down in time; The monitoring unit is used to monitor the working status of the energy storage workstation in real time and transmit the data to the operation controller, the safety protection unit and the user interface; The communication interface circuit is used to realize data communication during the operation of the energy storage device; the user interface is used to input user instructions, change parameters, and display the operating status, data and fault conditions of the energy storage workstation; the operation controller is used for operation monitoring of the energy storage workstation, including start and stop control, control of various electronic components and power grid monitoring, wherein the operation controller adjusts the generator motor according to the speed detected by the speed sensor so that the speed of the generator motor runs within the set speed range, the operation controller senses the real-time energy storage or energy release margin of the energy storage module according to the distance detected by the distance measuring sensor to control the corresponding suspension module, and the operation controller also controls the corresponding suspension module according to the tension sensed by the force sensor.

14. The energy storage device according to claim 13, characterized in that: The operation process of the energy storage device includes: During energy storage operation: The control system opens a corresponding number of energy storage workstations according to the energy storage capacity requirements of the new energy power plant. In the opened energy storage workstations, the control system first connects the transmission route between the first energy storage module and the generator motor, releases the brake on the suspension module corresponding to the first energy storage module, and connects the power cable to start the generator motor. The vacuum volume of each vacuum element of the first energy storage module and the volume of the liquid storage tank for holding liquid increase linearly with the increase of the moving distance of the hanger. The liquid in the supporting guide cylinder in the vacuum energy storage mechanism flows into the liquid storage tank of the gravity energy storage mechanism. When the hanger reaches the first set position, it is determined that all energy storage sub-modules in the first energy storage module are at full load energy storage, then the suspension module corresponding to the first energy storage module is braked, and the transmission route between the first energy storage module and the transmission shaft is disconnected. The energy storage of the first energy storage module is completed, and the control system is in accordance with the first storage The same operation of the energy storage module is performed to start the remaining energy storage modules in sequence, until all the energy storage modules in the opened energy storage workstation have completed energy storage, and the control system disconnects the power cable and brakes the generator motor; if there is still surplus electric energy to be stored, the control system will continue to open the remaining energy storage workstations that have not achieved full-load energy storage, and when all energy storage workstations are fully loaded with energy storage, the energy storage operation is completed; when a single or part of the energy storage workstations are storing energy and there is an unexpected situation of no energy storage capacity, the control system disconnects the power cable to brake the generator motor, and at the same time brakes all the suspension modules that are storing energy and disconnects the transmission route between all the energy storage modules that are storing energy and the generator motor, and the energy storage operation of the energy storage workstation is suspended. If there is a subsequent energy storage requirement, the energy storage workstation whose energy storage operation is suspended will continue the energy storage operation until the full-load energy storage of the energy storage workstation is achieved, and finally the full-load energy storage of the energy storage device is achieved; During energy release operation: The control system opens a corresponding number of energy storage workstations according to the required energy release capacity. In the opened energy storage workstation, the control system first connects the power cable to start the generator motor. The control system first releases the brake on the suspension module corresponding to the first energy storage module in the energy storage workstation, and at the same time connects the transmission route between the first energy storage module and the generator motor. As the vacuum volume of each vacuum element of the first energy storage module decreases, the weight of the gravity energy storage mechanism gradually sinks into the liquid surface of the liquid storage tank, causing the liquid in the liquid storage tank to flow into the supporting guide cylinder of the vacuum energy storage mechanism, and drives the hanger to move downward, thereby releasing the wire rope from the drum through the corresponding movable pulley, so that the generator motor rotates to generate electricity. When the hanger in the first energy storage module reaches the second set position, it indicates that the current energy release of the first energy storage module has ended, and the control system brakes The suspension module corresponding to the first energy storage module is disconnected, and the transmission route between the first energy storage module and the transmission shaft is disconnected. The energy release of the first energy storage module is completed, and the control system releases the remaining energy storage modules in turn according to the same operation until all energy storage modules in the opened energy storage workstation have completed energy release, and the energy storage workstation has completed energy release; when the energy storage workstation is in the process of releasing energy and an unexpected situation occurs where energy release is not required, the control system first disconnects the power cable and brakes the generator motor, and at the same time brakes the suspension module that is releasing energy and disconnects the transmission route between all energy storage modules that are releasing energy and the generator motor, and the energy release operation of the energy storage workstation is suspended. If there is a subsequent energy release requirement, the energy storage workstation that has been suspended from releasing energy will continue to release energy until the full-load energy release of the energy storage workstation is achieved, and finally the full-load energy release of the energy storage device is achieved.

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