Gravity-vacuum hybrid energy storage workstation and device for new energy power generation system

Abstract

The invention provides a gravity-vacuum hybrid energy storage workstation for a new energy power generation system, which comprises a transmission shaft, a generator motor and a plurality of energy storage devices, and the energy storage devices comprise energy storage modules, suspension modules and mechanical transmission modules which are arranged in a matched manner; the energy storage module is connected with the transmission shaft through the suspension module and the mechanical transmission module. The energy storage module comprises a vacuum element and a weight fixed to the movable end of the vacuum element. Under the action of the suspension module, a closed cavity in the vacuum element forms vacuum, when the vacuum volume is increased upwards, the surface of the movable end is subjected to pressure potential energy generated by atmospheric pressure air, and meanwhile, a weight moves along with the movable end to generate gravitational potential energy, so that two forms of energy storage are realized; when pressure potential energy and gravitational potential energy in each energy storage module act on the suspension module to enable the generator motor to rotate to generate power, energy release is achieved. According to the invention, large-capacity and multi-mode energy storage and energy release can be realized, the application scene is wide, the energy storage density is large, and the integration level is high.

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 gravity-vacuum hybrid energy storage workstation and device for a new energy power generation system. Background Art

[0002] Wind 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. Compared with fossil fuel power generation, wind power generation and photovoltaic power generation can significantly reduce the emission of carbon dioxide and other greenhouse gases, which helps to mitigate the impact of global warming. However, 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, and then 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 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 the 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 leads to coal-fired power plants that are more environmentally damaging and have a larger proportion of carbon emissions as the main power generation 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, so that new energy power generation companies cannot 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 gravity or vacuum energy storage technology.

[0003] Gravity energy storage is to use the rotation of the generator motor to lift heavy objects to a high place when there is abundant electricity, and convert the electricity into gravitational potential energy. When electricity is needed, gravity is used to drive the heavy objects down, so that the generator motor generates electricity. Vacuum energy storage is to use electric energy to do work on the motor, drive the components with internal enclosed space to form an internal vacuum, and convert the electric energy into pressure potential energy on the outer surface of the vacuum component as the vacuum volume increases; when generating electricity, the pressure of the external medium is used to act on the active end of the vacuum component 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 large depth in the ocean, rivers, and lakes to make the vacuum element obtain a large energy storage density. However, many inland areas do not have such conditions. If the vacuum element with an internal enclosed space is stored in the atmosphere alone in inland areas, the energy storage density is low. In addition, the short energy release time of the vacuum element is also the biggest problem affecting its application. The above reasons have led to the fact that vacuum energy storage technology has not been widely used. 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 gravity-vacuum hybrid energy storage workstation and device for a new energy power generation system. The present disclosure combines a vacuum element capable of generating a vacuum with a heavy object capable of generating gravitational potential energy to construct a gravity-vacuum hybrid energy storage workstation, and then constructs a gravity-vacuum hybrid energy storage device, thereby broadening the application scope of vacuum energy storage, so that it can also be applied in water-scarce inland areas: large-capacity and multiple modes of energy storage and energy release are achieved at the same time, and the energy storage density is large and the integration is high. By connecting the gravity-vacuum hybrid energy storage device between the existing wind power or photovoltaic power generation system and the power grid, the above two types of new energy power generation are not directly connected to the grid, but are first stored by the gravity-vacuum hybrid energy storage device; when the main power grid needs electric energy, the energy is released by the gravity-vacuum hybrid energy storage device. The energy release process of the gravity-vacuum hybrid energy storage device is controllable throughout the process, and the energy release time is relatively long, which solves the technical problems caused by the instability of the two types of new energy power generation, and creates conditions for comprehensively establishing a power supply pattern dominated by new energy and reducing the pollution of coal-fired power plants to the environment.

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

[0007] A gravity-vacuum 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 element and a weight; a closed chamber is formed inside the vacuum element, one end of the vacuum element is a fixed end, and the other end is a movable end, and the weight is fixedly connected to the movable end of the vacuum element;

[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 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, the movable ends of the weights and vacuum elements in the energy storage module move synchronously with the corresponding movable pulleys, so that the gravitational potential energy generated by the movement of each weight and the pressure potential energy generated by the change of the vacuum volume of the closed chamber inside each vacuum element 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 internal closed chamber, and forms a pressure difference with the external atmospheric pressure, thereby generating pressure release energy. The pressure potential energy is the position release energy generated by the pressure acting on the active end of the vacuum element.

[0013] In some embodiments, the vacuum element takes any one of the following forms:

[0014] ① The vacuum element adopts a cylindrical shell with an opening at one end and an annular sealing assembly at the opening. The weight is connected to the sealing assembly at the opening of the cylindrical shell as a plunger of the vacuum element. The weight is extended into or out of the cylindrical shell, so that the vacuum volume of the closed chamber inside the cylindrical shell is reduced or increased;

[0015] ② The vacuum element adopts a cylindrical closed shell with a telescopic side wall, the top of the closed shell is fixedly connected to the weight, and the top of the closed shell is driven by the weight to move up and down, so that the vacuum volume of the closed chamber inside the closed shell increases or decreases;

[0016] ③ The vacuum element adopts a cylindrical closed shell with a foldable side wall, and a guide constraint is arranged on the periphery of the vacuum element. The top end of the closed shell is fixedly connected to the weight, and the weight drives the top end of the closed shell to move up and down, so that the vacuum volume of the closed chamber inside the closed shell increases or decreases.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 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 a matching energy storage sub-module and fixedly connected to the frame, the first fixed pulley and the second fixed pulley are rotatably mounted on the same fixed shaft; the weight is connected to the connecting shaft above it, and the movable pulley is rotatably mounted on the connecting shaft above the weight in a matching energy storage sub-module; 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.

[0022] 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.

[0023] A second aspect of the present disclosure provides a gravity-vacuum 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;

[0024] The energy storage workstation adopts the energy storage workstation according to any embodiment of the first aspect of the present disclosure;

[0025] 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.

[0026] 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 upper surface of the heavy object 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. A full 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 operating monitoring of the energy storage workstation, including start-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.

[0027] In some embodiments, the operation process of the energy storage device includes:

[0028] During energy storage operation:

[0029] 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 line 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 simultaneously connects the power cable to start the generator motor. The volume of each vacuum element of the first energy storage module increases linearly with the increase of the upward moving distance of the weight. When the weight reaches the first set position, it is determined that all energy storage sub-modules in the first energy storage module are in full-load energy storage, then the suspension module corresponding to the first energy storage module is braked, and the transmission line between the first energy storage module and the transmission shaft is disconnected. After the energy storage of the first energy storage module is completed, the control system starts the remaining energy storage modules in sequence according to the same operation as the first energy storage module, until When all the energy storage modules in the opened energy storage workstation have completed energy storage, the control system disconnects the power cables 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. When all energy storage workstations are fully loaded with energy, the energy storage operation is completed; when a single or part of the energy storage workstations are storing energy and there is an unexpected lack of energy storage capacity, the control system disconnects the power cables to brake the generator motor, and at the same time brakes all the suspension modules that are storing energy and disconnects the transmission lines 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 subsequent energy storage demand, the energy storage workstation whose energy storage operation is suspended will continue the energy storage operation until the energy storage workstation achieves full-load energy storage, and finally achieves full-load energy storage of the energy storage device;

[0030] During energy release operation:

[0031] 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, and controls the drum to release the wire rope to prepare the generator motor for power generation. When the vacuum volume of each vacuum element of the first energy storage module is reduced under the action of atmospheric pressure, the weight, with the help of gravity, drives the generator motor to generate electricity through the suspension module, mechanical transmission module, transmission shaft and speed increaser in sequence. When the weight 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 first energy storage module. The suspension module corresponding to the energy storage module is activated, 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 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.

[0032] The present disclosure has the following features and beneficial effects:

[0033] The gravity-vacuum hybrid energy storage device disclosed in the present invention is an energy storage device supporting a new energy power plant, and can realize large-capacity and multi-mode energy storage and release. Specifically, the energy storage capacity of the gravity-vacuum 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 small within a certain period of time, the gravity-vacuum hybrid energy storage device starts a single or a small number of energy storage stations to participate in energy storage; in the gravity-vacuum hybrid energy storage device, it is possible to realize that a single or multiple energy storage stations participate in energy storage or energy release at the same time, it is also possible to realize that all energy storage stations participate in energy storage or energy release at the same time, it is also possible to realize that a single energy storage station participates in energy storage or energy release in succession, and some energy storage stations can participate in energy storage or energy release in succession as a whole, which 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 adopts the method of successive energy release of each energy storage module, which has the characteristics of a long energy release time, and can also meet the main grid's requirements for the release of electric energy by the gravity-vacuum hybrid energy storage device with certain flexibility by starting different numbers of energy storage units to generate electricity. 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 gravity-vacuum hybrid energy storage device. The electric energy generated by the gravity-vacuum hybrid energy storage device remains 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.

[0034] In addition, according to the characteristics of the movable pulley, the present invention can install one movable pulley and two fixed pulleys in the pulley group corresponding to each energy storage submodule and connect them with 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 requirement 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 volume of the vacuum element and the mass of the heavy object, creating conditions for improving the integration and large-scale application of the energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a top view schematic diagram of a gravity-vacuum 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;

[0036] Figure 2 yes Figure 1 AA section side view in;

[0037] Figure 3 yes Figure 1Schematic diagram of the structure of a single energy storage submodule;

[0038] Figure 4 It is a layout diagram of a gravity-vacuum hybrid energy storage device for a new energy power generation system provided by an embodiment of the second aspect of the present disclosure;

[0039] Figure 5 yes Figure 4 A schematic diagram of the structure of the control system in the gravity-vacuum hybrid energy storage device shown;

[0040] Reference numerals:

[0041] 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-inter-group fixed pulley, 118-movable pulley, 119-connecting shaft, 120-mechanical transmission module, 121-second clutch, 122-clutch bracket, 123-first Sprocket, 124-chain, 125-second sprocket, 126-one-way overrunning clutch, 130-transmission shaft, 131-bearing, 140-energy storage module, 141-energy storage submodule, 141a-vacuum element, 141b-weight, 150-first clutch, 160-transmission, 170-generator motor, 171-power cable, 180-frame, 181-base plate, 190-elastic coupling;

[0042] 200-control cable;

[0043] 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

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] See also Figures 1 to 3 , a gravity-vacuum 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;

[0050] 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 in the same row or column are regarded as a group of energy storage submodules.

[0051] The energy storage submodule 141 includes a vacuum element 141a and a weight 141b. A sealed chamber is formed inside the vacuum element 141a. One end of the vacuum element 141a is a fixed end and the other end is a movable end. The weight 141b is fixedly connected to the movable end of the vacuum element 141a. When the weight 141b moves upward along the inner wall of the vacuum element 140a together with the movable end of the vacuum element 141a under the traction of the suspension module 110, the weight 141b generates gravitational potential energy, and at the same time, a vacuum is formed in the sealed chamber inside the vacuum element 141a, forming a pressure difference with the outside, thereby generating pressure potential energy;

[0052] 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 blocks and a plurality of fixed pulleys 117 between groups. The drum 114 is supported in the frame 180. Each pulley block cooperates with a corresponding energy storage submodule 141 in the energy storage module 140. Each pulley block consists of a plurality of fixed pulleys fixed in the frame 180 and at least one movable pulley fixedly connected to the weight 141b. The adjacent groups in the energy storage module 140 are divided into A fixed pulley 117 between groups is separately configured to change the direction of the steel wire rope 115 in the adjacent groups; 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, the weights 141b in the energy storage module 140 move synchronously, so that the gravitational potential energy generated by the movement of the weights 141b and the pressure potential energy generated by the change of the vacuum volume inside the vacuum element 141a change synchronously, thereby realizing energy storage and energy release;

[0053] 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 to the high speed required by the generator motor; the generator motor 170 is connected to the power cable of the new energy power generation system through the power cable 171.

[0054] In some embodiments, the energy storage workstation 100 includes a plurality of energy storage modules 140, the number of which is 2 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.

[0055] In some embodiments, the rack 180 is a box as a whole. In order to facilitate the arrangement of as many energy storage sub-modules 141 as possible within the footprint of the rack 180 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 in the frame 180), so that the drum 114 can arrange the rope correctly when winding the wire rope 115.

[0056] In some embodiments, the vacuum element 141a in each energy storage submodule 141 forms a vacuum by moving a portion of its inner surface in at least one direction to increase the internal closed chamber, and forms a pressure difference with the external atmospheric pressure, thereby generating pressure release energy. The pressure potential energy is the position release energy generated by the pressure acting on the active end of the vacuum element 141a.

[0057] Furthermore, the vacuum element 141a may be in any of the following forms:

[0058] ① The vacuum element 141a adopts a cylindrical shell with an opening at one end and an annular sealing assembly at the opening. The weight 141b is connected to the sealing assembly at the opening of the cylindrical shell as a plunger of the vacuum element 141a. The weight 141b extends into or out of the cylindrical shell, so that the vacuum volume of the closed chamber inside the cylindrical shell is reduced or increased. Figure 3; Further, the cylindrical shell is buried underground or fixed inside the frame 180. When buried underground, it is an underground shaft, and the wellhead is fixedly connected to the bottom plate 181 of the frame, and the burial depth should not exceed 60m. When fixed inside the frame 180, the bottom end of the cylindrical shell is fixedly connected to the bottom plate 181 of the frame, and the height of the frame 180 is preferably 20 to 120 meters;

[0059] ② The vacuum element 141a adopts a cylindrical closed shell with a telescopic side wall. The bottom end of the closed shell is fixedly connected to the bottom plate 181 of the frame 180, and the top end of the closed shell is fixedly connected to the weight 141b. The top end of the closed shell is driven up and down by the weight 141b, so that the vacuum volume of the closed chamber inside the closed shell increases or decreases;

[0060] ③ The vacuum element 141a adopts a cylindrical closed shell with a foldable side wall (such as a flexible or bellows structure), the bottom end of the closed shell is fixedly connected to the bottom plate 181 of the frame 180, and the top end of the closed shell is fixedly connected to the weight 141b. The top end of the closed shell is driven up and down by the weight 141b, so that the vacuum volume of the closed chamber inside the closed shell increases or decreases; in this case, in order to ensure the stability of the side wall of the vacuum element 141a during the change process, it is necessary to configure guide constraints on the periphery of the vacuum element 141a, such as arranging a number of guide rods fixedly connected to the frame 180 on the periphery of the side wall of the vacuum element 141a.

[0061] 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, totaling four sets. The vacuum element 141a in the energy storage submodule 141 adopts the underground shaft form in the first embodiment described above, and the top of the vacuum element 141a is fixedly connected to the bottom plate of the frame to reduce the height of the energy storage module 140 above the ground, thereby reducing the height of the frame 180. When the energy is stored, the atmospheric pressure on the upper surface of the weight 141b can be regarded as unchanged, and the gravity on the weight 141b as the plunger of the vacuum element 141a also remains unchanged, so that the driving load of the generator motor 170 remains basically unchanged, and conversely, the input power of the generator motor 170 can also remain stable during the energy release operation; in addition, the height of the weight 141b should be greater than or equal to the height of the inner cavity of the vacuum element 141a, so that the moving distance of the weight 141b and the vacuum volume formed by the vacuum element are maximized.

[0062] 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 141a in the energy storage module 140 increases, and at the same time, as the weight 141b 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.

[0063] 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.

[0064] 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.

[0065] 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 continued operation of the transmission shaft 130 by the remaining energy storage modules 140 that are not braked. 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 module 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 that does not participate 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 idles.

[0066] 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 141a and the weight 141b 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.

[0067] 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 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 a connecting shaft 119 connected to the weight 141b. 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.

[0068] 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.

[0069] 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.

[0070] See also Figure 4 , Figure 5 The second aspect of the present disclosure provides a gravity-vacuum 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.

[0071] 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.

[0072] In some embodiments, the number of energy storage workstations 100 included in the gravity-vacuum 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 gravity-vacuum 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.

[0073] 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 weight 141b 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 gravity-vacuum 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 gravity-vacuum 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.

[0074] In some embodiments, the operation process of the gravity-vacuum hybrid energy storage device includes:

[0075] During energy storage operation: the control system 300 opens the energy storage equipment 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 equipment in the opened energy storage workstations 100, the control system 300 first starts the first energy storage module 140: first connects the second clutch 121 and the first clutch 150, then releases the brake 111 on the reel 114, and at the same time connects the power cable 171 to start the generator motor 170, and uses the transmission 160 to increase the torque to drive the transmission shaft 130, and the transmission shaft 130 transmits the torque to the suspension module 110 through the mechanical transmission module 120: the transmission shaft 130 rotates the second sprocket 125 through the one-way overrunning clutch 126 thereon, and the second sprocket 125 is driven by the chain The first sprocket 124 rotates the first sprocket 123, and the first sprocket 123 rotates the drum 114 through the second clutch 121, so that the drum 114 is wound with the wire rope 115. After the drum 114 is wound with the wire rope 115, in each energy storage submodule 141, the movable pulley 118 is pulled, so that the weight 141b moves upward, and at the same time, the vacuum volume inside the vacuum element 141a increases to form pressure potential energy, and the weight 141b moves upward synchronously to generate gravity potential energy. When the control system 300 senses through the distance measuring sensor 312 that all the weights 141b 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 drum 114 is braked by the brake 111. Braking is performed, and at the same time, 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 second clutch 121 in the mechanical energy storage module 120 is connected, and the transmission shaft 130 stores energy for 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, and 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 will continue to open the energy storage modules in the remaining energy storage workstations 100. Equipment, until all energy storage workstations 100 of the entire gravity-vacuum hybrid energy storage device are fully loaded with energy storage, the energy storage operation is completed; when a single or part of the energy storage workstations 100 are storing energy and there is unexpectedly 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 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 is fully loaded with energy storage, and finally the gravity-vacuum hybrid energy storage device is fully loaded with energy storage;

[0076] 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 energy storage submodules 141 of the energy storage module 140 generate the gravitational potential energy generated by the downward movement of the weight 141b and the pressure potential energy generated by the vacuum element 141a due to the reduction of its vacuum volume. The movable pulley 118 moves downward, and the wire rope 115 is pulled by the corresponding movable pulley 118. The wire rope 115 wound on the drum 114 is released, and the drum 114 is pulled by the wire rope 115 to transmit 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. The transmission shaft 130 transmits the motion to the low-speed shaft of the transmission 160 through the first clutch 150, and then transmits it 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 141a of the first energy storage module becomes smaller, and the weight 141b Gradually descend, when the weight 141b in the first energy storage module 140 descends 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 disengage the second clutch 121, and 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 starts to release energy with a small advance amount in time to ensure that the generator motor 170 generates electricity smoothly; since the component of the mechanical transmission module 120 connecting the transmission shaft 130 of the first energy storage module 140 is a one-way overrunning clutch 126, the second energy storage module 140 is released after the energy is released alone. The mechanical transmission module 120 matched with the two energy storage modules 140 will not hinder the rotation of the transmission shaft 130; until all the energy storage modules 140 in the energy storage workstation 100 have released their 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 the reels 114 are braked by the brake 111, all the second clutches 121 are disengaged, and the energy release of the energy storage workstation 100 is completed; if the gravity-vacuum 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 gravity-vacuum hybrid energy storage device achieves full load energy release;When a single or part of the energy storage workstation 100 is in the process of releasing energy, and unexpectedly there is no need to release energy, 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 141a and the weight 141b stop moving 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 will continue the energy release operation to achieve full-load energy release of the energy storage workstation 100, and finally the gravity-vacuum hybrid energy storage device achieves full-load energy release. ;

[0077] 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.

[0078] 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 gravity-vacuum 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 element and a weight; a closed chamber is formed inside the vacuum element, one end of the vacuum element is a fixed end, and the other end is a movable end, and the weight is fixedly connected to the movable end of the vacuum element; 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 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, the movable ends of the weights and vacuum elements in the energy storage module move synchronously with the corresponding movable pulleys, so that the gravitational potential energy generated by the movement of each weight and the pressure potential energy generated by the change of the vacuum volume of the closed chamber inside each vacuum element 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 part of its inner surface in at least one direction to increase the internal closed chamber, and forms a pressure difference with the external atmospheric pressure, thereby generating pressure release energy. The pressure potential energy is the position release energy generated by the pressure acting on the active end of the vacuum element.

3. The energy storage workstation according to claim 1, characterized in that: The vacuum element is in any of the following forms: ① The vacuum element adopts a cylindrical shell with an opening at one end and an annular sealing assembly at the opening. The weight is connected to the sealing assembly at the opening of the cylindrical shell as a plunger of the vacuum element. The weight is extended into or out of the cylindrical shell, so that the vacuum volume of the closed chamber inside the cylindrical shell is reduced or increased; ② The vacuum element adopts a cylindrical closed shell with a telescopic side wall, the top of the closed shell is fixedly connected to the weight, and the top of the closed shell is driven by the weight to move up and down, so that the vacuum volume of the closed chamber inside the closed shell increases or decreases; ③ The vacuum element adopts a cylindrical closed shell with a foldable side wall, and a guide constraint is arranged on the periphery of the vacuum element. The top end of the closed shell is fixedly connected to the weight, and the weight drives the top end of the closed shell to move up and down, so that the vacuum volume of the closed chamber inside the closed shell increases or decreases.

4. 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.

5. 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.

6. 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.

7. 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.

8. 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 a matching energy storage submodule and are fixedly connected to the frame, and the first fixed pulley and the second fixed pulley are rotatably sleeved on the same fixed shaft; the weight is connected to the connecting shaft above it, and the movable pulley is rotatably sleeved on the connecting shaft above the weight in a matching energy storage submodule; In a single pulley block, the steel wire rope passes through the first fixed pulley, the movable pulley and the second fixed pulley in sequence.

9. 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.

10. A gravity-vacuum 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 9; 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.

11. The energy storage device according to claim 10, 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 upper surface of the heavy object 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 the problem is closed 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.

12. The energy storage device according to claim 11, 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 line 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 simultaneously connects the power cable to start the generator motor. The volume of each vacuum element of the first energy storage module increases linearly with the increase of the upward moving distance of the weight. When the weight reaches the first set position, it is determined that all energy storage sub-modules in the first energy storage module are in full-load energy storage, then the suspension module corresponding to the first energy storage module is braked, and the transmission line between the first energy storage module and the transmission shaft is disconnected. After the energy storage of the first energy storage module is completed, the control system starts the remaining energy storage modules in sequence according to the same operation as the first energy storage module, until When all the energy storage modules in the opened energy storage workstation have completed energy storage, the control system disconnects the power cables 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. When all energy storage workstations are fully loaded with energy, the energy storage operation is completed; when a single or part of the energy storage workstations are storing energy and there is an unexpected lack of energy storage capacity, the control system disconnects the power cables to brake the generator motor, and at the same time brakes all the suspension modules that are storing energy and disconnects the transmission lines 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 subsequent energy storage demand, the energy storage workstation whose energy storage operation is suspended will continue the energy storage operation until the energy storage workstation achieves full-load energy storage, and finally achieves full-load energy storage of the energy storage device; 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, and controls the drum to release the wire rope to prepare the generator motor for power generation. When the vacuum volume of each vacuum element of the first energy storage module is reduced under the action of atmospheric pressure, the weight, with the help of gravity, drives the generator motor to generate electricity through the suspension module, mechanical transmission module, transmission shaft and speed increaser in sequence. When the weight 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 first energy storage module. The suspension module corresponding to the energy storage module is activated, 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 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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