A spring-gravity hybrid energy storage workstation and device for a new energy power generation system

Abstract

The present disclosure provides a spring-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 therein, 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 matching suspension module and a mechanical transmission module and is evenly arranged on both sides of the transmission shaft, and an elastic element is provided in the energy storage module; when the elastic element moves upward under the action of the suspension module and undergoes elastic deformation, elastic potential energy and gravitational potential energy are generated to achieve energy storage; when the elastic potential energy and gravitational potential energy formed by the elastic elements in each energy storage module 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 multi-mode energy storage and release, has a wide range of applicable scenarios, and has high energy storage density and high integration.

Description

Technical Field

[0001] The present disclosure belongs to the technical field of wind power generation and kinetic energy storage, and particularly relates to an elastic-gravity 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. Because they originate from nature, they are inexhaustible. This makes them promising options for sustainable power supply. However, due to factors both natural and technological, wind and photovoltaic power generation are intermittent, random, and have poor dispatchability, leading to a series of power quality issues. First, when wind and photovoltaic power generation fluctuate in output due to weather, this can cause voltage fluctuations on the wind farm's transmission lines, which in turn cause grid voltage fluctuations. Flicker can also occur when the wind power system's output power is high. Second, because wind and photovoltaic power generation have a certain degree of randomness in their unit output, as the proportion of these two renewable energy sources in the total power generation of the grid continues to increase, frequency fluctuations in the grid are likely to occur. These grid frequency issues can negatively impact the power system and its users. Furthermore, because both wind and photovoltaic power generation utilize a large number of power electronic devices, they generate significant harmonics and DC components. Once injected into the power system, these harmonics can cause voltage distortion in the grid, impacting the overall power quality of the grid. When these two renewable energy sources account for a small proportion of power generation, modern power electronics technology can limit these limitations within the grid's permitted limits. However, when these two renewable energy sources are connected to the grid on a large scale, they can significantly impact the power system. Therefore, the grid must control the amount of power generated by these two renewable energy sources within a manageable range to minimize any adverse impacts. However, with the continued development of renewable energy generation, some of the generating capacity of these two renewable energy sources often remains unutilized, preventing renewable energy power generation companies from achieving the expected returns on their investments. To this end, measures are being taken to develop and promote new energy storage technologies and support new energy storage power stations to increase the utilization rate of renewable energy, thereby achieving energy conservation and environmental protection. Furthermore, new energy storage technologies can improve energy reliability and stability. Due to the significant capital investment required to build energy storage plants using new energy storage technologies, they currently serve three primary functions: first, balancing electricity supply and demand. Energy storage plants can store energy during peak demand periods to balance power supply and ensure grid stability, helping to reduce the risk of blackouts and improve power system reliability. Second, they integrate renewable energy sources: Renewable energy sources such as wind and solar are volatile, and energy storage plants can capture and store excess power to provide power during volatile periods. Third, they provide frequency regulation and backup power. Energy storage plants can serve as frequency regulators for the power system, rapidly responding to fluctuations in electricity demand. However, this does not completely eliminate the aforementioned adverse effects of these two renewable energy sources on the power grid. To ensure overall grid stability and high power quality, renewable energy sources must account for only a small share of the power supply. Traditional coal-fired power generation, due to its fully controllable generation process and excellent power quality, remains the primary means of power generation. This contradicts the original intention of vigorously developing renewable energy.Therefore, the above problems can be effectively solved by using an economical and safe energy storage device placed between renewable energy power stations and the main power grid. This device can completely absorb the unstable power generated by photovoltaic and wind power generation, and then generate power according to the needs of the power grid, providing stable power over a period of time. To this end, researchers are also researching elastic energy storage technology.

[0003] The basic principle of elastic energy storage technology is to use electrical energy to perform work on an electric motor, driving elastic deformation of an elastic element and converting the electrical energy into elastic potential energy. During power generation, the elastic force is used to perform work, driving the generator to rotate, thereby converting the elastic potential energy into electrical energy. Hybrid elastic and gravity energy storage devices developed based on this principle offer advantages such as safety, fast response, large energy storage capacity, and long life. A common approach involves constructing a vortex spring box using a vortex spring, a vortex spring shaft, and a vortex spring housing. This is then combined with a generator motor to form an energy storage station. Finally, multiple energy storage stations and a control system form the energy storage device. Due to the limited energy storage capacity of the vortex springs, this approach results in a small energy storage capacity for each energy storage station. As the vortex springs in each vortex spring box release energy sequentially, the generated torque fluctuates. To increase the energy storage capacity, a method has also emerged where vortex spring boxes with built-in vortex springs are connected in series: the end of the vortex spring housing of the first vortex spring box is connected to the vortex spring shaft of the second vortex spring box, and multiple vortex spring boxes are connected in series. These two technical solutions present significant shortcomings as energy storage solutions for new energy sources. The first approach suffers from a short energy release time and large torque fluctuations. If 1 represents the unit of torque generated by the vortex spring box that drives the subsequent transmission and generator motor, the ratio of the maximum to minimum torque generated by the vortex spring box is 3 to 1.2. While the series vortex spring box approach has a longer energy release time, the ratio of the maximum to minimum torque generated is also 3 to 1.2. Both approaches place extremely high demands on the energy storage station's control system. Generators require relatively stable input mechanical speed and torque, with no significant fluctuations. This is difficult to achieve with purely mechanical speed regulation. Power electronics are typically required to maintain a stable generator speed, which inevitably results in additional energy loss and reduces the energy conversion efficiency of the energy storage unit. Furthermore, due to the low energy storage density and short energy release time of a single vortex spring, the series vortex spring box arrangement typically requires a horizontal layout, which occupies a large area. The low energy storage density also results in a high initial investment per unit of energy storage. These factors have prevented widespread application of elastic energy storage technology in new energy generation. Summary of the Invention

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

[0005] To this end, the present disclosure provides an elastic-gravity hybrid energy storage workstation and device for a new energy power generation system. The present disclosure uses multiple energy storage workstations with elastic elements to construct an elastic-gravity hybrid energy storage device, thereby achieving large-capacity and multiple modes of energy storage and release, with high energy storage density and high integration. By connecting the above-mentioned elastic-gravity hybrid energy storage device between the existing wind power or photovoltaic power generation system and the power grid, the above-mentioned two types of new energy power generation are not directly connected to the grid, but are stored by the above-mentioned elastic-gravity hybrid energy storage device; when the main power grid needs electricity, the above-mentioned elastic-gravity hybrid energy storage device releases energy. The energy release process of the above-mentioned elastic-gravity hybrid energy storage device is fully controllable, which solves the technical problems caused by the instability of the two types of new energy power generation and creates conditions for the comprehensive establishment of a power supply pattern dominated by new energy.

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

[0007] A first aspect of the present disclosure provides a spring-gravity hybrid energy storage workstation for a new energy power generation system, comprising a frame, a transmission shaft, a first clutch, a speed change mechanism, a generator motor, and several energy storage modules located therein, each energy storage module being 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 comprises 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 considered a group of energy storage sub-modules.

[0009] The energy storage submodule includes a support guide frame and a force column located therein, an elastic element connected to the force column is provided on at least one of the upper and lower sides of the force column, and the support guide frame is fixedly connected to the frame;

[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 sub-module in the energy storage module, each pulley group consists of a plurality of fixed pulleys and at least one movable pulley installed on the force-applying column, 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 force-applying columns in the energy storage module move synchronously, so that each elastic element simultaneously generates elastic deformation and causes changes in elastic potential energy and gravitational potential energy, 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 speed change mechanism through the first clutch, and the other end of the speed change mechanism is connected to the generator motor through an elastic coupling. The speed difference between the transmission shaft and the set speed of the generator motor is matched by the speed change mechanism, 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 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.

[0013] 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 achieve mechanical transmission between the transmission shaft and the energy storage module.

[0014] 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.

[0015] 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.

[0016] In some embodiments, the support guide frame is a cylindrical structure, and each pulley group in the suspension module is respectively composed of 4 fixed pulleys and 2 movable pulleys. All pulleys in a single suspension module are connected by a steel wire rope. The 4 fixed pulleys are arranged above the support guide frame of a matching energy storage submodule and are fixedly connected to the frame. The first fixed pulley is parallel to the plane where the fourth fixed pulley is located, the second fixed pulley and the third fixed pulley are in the same plane and form a certain angle with the plane where the first fixed pulley or the fourth fixed pulley is located, and the axial center position of the first fixed pulley and the fourth fixed pulley is larger than that of the second fixed pulley and the third fixed pulley. The axis position is low; two movable pulleys are arranged on both sides of the supporting guide frame of a matching energy storage sub-module and are connected to the force column through connecting shafts protruding from the two side walls of the supporting guide frame; the two movable pulleys are rotatably sleeved on the connecting shaft, and strip holes arranged in the vertical direction are formed on the two side walls of the supporting guide frame to constrain the movement direction of the force column and the elastic element connected to it; the steel wire rope is respectively introduced into and led out of each pulley group by the first fixed pulley and the fourth fixed pulley. In a single pulley group, the steel wire rope passes through the first fixed pulley, the first movable pulley, the second fixed pulley, the third fixed pulley, the second movable pulley and the fourth fixed pulley in sequence.

[0017] In some embodiments, the angle between the plane where the second fixed pulley and the third fixed pulley are located and the plane where the first fixed pulley or the fourth fixed pulley is located is an acute angle, which is 22.5° to 65°.

[0018] In some embodiments, each fixed pulley in the pulley group is arranged above the support guide frame of a matching energy storage sub-module and is fixedly connected to the frame, and the movable pulley is arranged in the internal cavity or the upper end surface of the force column of a matching energy storage sub-module.

[0019] 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 made opposite by the inter-group fixed pulley.

[0020] In some embodiments, the first elastic element and the second elastic element are both linear elastic elements.

[0021] In some embodiments, the number of the energy storage modules is 4 to 10, and is an even number.

[0022] In some embodiments, the speed change mechanism includes a fixed speed ratio transmission and a continuously variable transmission, the low speed shaft of the fixed speed ratio transmission is connected to one end of the transmission shaft through the first clutch, the high speed shaft of the fixed speed ratio transmission is connected to one end of the continuously variable transmission, and the other end of the continuously variable transmission is connected to the generator motor through the elastic coupling.

[0023] In some embodiments, the energy storage workstation adopts a two-stage energy release mode.

[0024] During the first stage of energy release, each energy storage module in the energy storage workstation releases energy in sequence. When the energy released by the previous energy storage module barely reaches the energy required to drive the generator motor to operate normally, the suspension module of the previous energy storage module is braked to disconnect the suspension module from the transmission shaft, and the next energy storage module is connected to perform work on the transmission shaft. When all energy storage modules have completed their individual energy release in sequence, the first stage of energy release ends and the second stage of energy release begins.

[0025] During the second stage of energy release, all energy storage modules in the energy storage workstation simultaneously work on the transmission shaft. When the energy released by all energy storage modules reaches the energy required to drive the generator motor to operate normally, the power cable is disconnected to brake the generator motor, all suspension modules are braked and the suspension module is disconnected from the mechanical transmission module, and the energy storage workstation completes energy release.

[0026] A second aspect of the present disclosure provides an elastic-gravity hybrid energy storage device for a new energy power generation system, comprising a control system and a plurality of energy storage workstations, each energy storage workstation being connected to the control system via a control cable;

[0027] The energy storage workstation adopts the energy storage workstation according to any embodiment of the first aspect of the present disclosure;

[0028] 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.

[0029] 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 force column 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 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 monitoring unit. 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 speed change mechanism according to the speed detected by the speed sensor so that the speed of the generator motor operates 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.

[0030] In some embodiments, the operation process of the energy storage device includes:

[0031] During energy storage operation:

[0032] 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 at the same time connects the power cable to start the generator motor. By controlling the speed change mechanism, the speed of the drum is made to wind the wire rope in a gradually decreasing manner. The resultant force of the elastic force of each elastic element of the first energy storage module and the gravity increases linearly. When the force column reaches the first set position, it is determined that all the 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 each 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 operates in the same order as the first energy storage module. Start the remaining energy storage modules until all energy storage modules in the opened energy storage workstation have completed energy storage, and 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 yet 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 unexpectedly there is no energy storage capacity, the control system disconnects the power cables to brake the generator motor, and at the same time brakes all suspension modules that are storing energy and disconnects the transmission lines between all 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 has been 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;

[0033] The energy release operation is divided into two stages:

[0034] 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 and enters the first stage energy release mode, that is, each energy storage module in the energy storage workstation releases energy separately. 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 line between the first energy storage module and the generator motor. By controlling the speed change mechanism, the speed of the drum is gradually increased to release the wire rope, so that the generator motor rotates to generate electricity. The resultant force of the elastic force of each elastic element of the first energy storage module and the gravity decreases linearly. When the force column in the first energy storage module reaches the second set position, it indicates that the energy currently released by the first energy storage module barely reaches the energy required to drive the normal operation of the generator motor. The control system brakes the suspension module corresponding to the first energy storage module and disconnects the transmission line between the first energy storage modules and the drive shaft. The first stage energy release of the first energy storage module ends, and the control system performs the same operation to make the remaining energy storage modules perform the first stage potential energy in turn until they are opened. After all energy storage modules in the energy storage workstation complete the first phase of energy release, the energy storage workstation enters the second phase of energy release mode. During the second phase of energy release, the control system controls all energy storage modules in the activated energy storage workstation to release energy simultaneously. When the force-applying columns in all energy storage modules in the energy storage workstation reach the third set position, indicating that the energy currently released by the energy storage workstation barely meets the energy required to drive the generator motor for normal operation, the control system disconnects the power cables in the energy storage workstation to brake the generator motor, brakes all suspension modules, and disconnects the transmission lines between each energy storage module and the generator motor, thus completing the energy release of the energy storage workstation. If the energy storage workstation is in the process of energy release and unexpectedly encounters a situation where energy release is no longer required, the control system first disconnects the power cables and brakes the generator motor, simultaneously brakes the suspension module that is currently releasing energy, and disconnects the transmission lines between all energy storage modules that are currently releasing energy and the generator motor, thereby suspending the energy release operation of the energy storage workstation. If there is a subsequent energy release requirement, the energy storage workstation whose energy release operation has been suspended will continue the energy release operation until the energy storage workstation achieves full load energy release, ultimately achieving full load energy release of the energy storage device.

[0035] The present disclosure has the following features and beneficial effects:

[0036] The elastic-gravity hybrid energy storage device disclosed in the present invention is an energy storage device supporting new energy power plants, which can realize large-capacity and multi-mode energy storage and release. The grid-connected electricity can maintain stable output power without the participation of power electronic devices and only by relying on the mechanical continuously variable transmission speed regulation method. Specifically, the energy storage capacity of the elastic-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 within a certain period of time, the elastic-gravity hybrid energy storage device starts a single or a small number of energy storage workstations to participate in power generation; in the elastic-gravity hybrid energy storage device, it is possible to realize that a single or multiple energy storage workstations participate in energy storage or energy release at the same time, it is also possible to realize that all energy storage workstations participate in energy storage or energy release at the same time, it is also possible to realize that a single energy storage workstation participates in energy storage or energy release in succession, and it is also possible that some energy storage workstations participate in energy storage or energy release as a whole in succession. This not only ensures that the wind farm can still store energy in the case of light wind or constantly changing wind speed or the photovoltaic power plant can still store energy in the case of low-intensity light or constantly changing light intensity, but also meets the main power grid's requirement that the elastic-gravity hybrid energy storage device has a certain degree of flexibility in releasing electric energy. 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 elastic-gravity hybrid energy storage device. The electric energy generated by the elastic-gravity hybrid energy storage device can remain stable, thereby eliminating the adverse effects of the new energy power generation method 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.

[0037] In addition, according to the characteristics of the movable pulley, the present invention installs two movable pulleys on both sides of each energy storage submodule, and installs four fixed pulleys above the energy storage submodule and connects them with a steel wire rope. Although the total ultimate force of the entire energy storage module is very large, the maximum tension that the steel wire rope can withstand is only one-fourth of the ultimate force of a single energy storage submodule, which can greatly reduce the requirements for the strength of the steel wire rope. It is also particularly suitable for energy storage submodules with a small elastic element diameter and it is inconvenient to set a movable pulley group at the axis position of the elastic element. At the same time, the energy storage density of each energy storage module can be further improved by increasing the number and height of the energy storage submodules, creating conditions for improving the integration and large-scale application of the elastic and gravity hybrid energy storage device. Since the energy storage submodules in the elastic-gravity hybrid energy storage device are installed vertically, compared with the pure elastic energy storage device, the gravitational potential energy generated by its elastic elements during energy storage is used in the energy release process. In addition, a second-stage energy release mode is added during energy release in which all energy storage modules work together, so that the elastic potential energy and gravitational potential energy generated by the elastic-gravity hybrid energy storage device during energy storage can be fully converted into electrical energy, thereby increasing the effective energy release capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1This is a top view of a spring-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 image limitations, some energy storage units and racks located above the drive shaft are omitted in this figure;

[0039] Figure 2 yes Figure 1 AA section side view in;

[0040] Figure 3 yes Figure 1 BB section side view in;

[0041] Figure 4 1 is a schematic diagram of the layout of a spring-gravity hybrid energy storage device for a new energy power generation system provided by an embodiment of the second aspect of the present disclosure;

[0042] Figure 5 yes Figure 4 Schematic diagram of the control system in the elastic-gravity hybrid energy storage device shown;

[0043] Reference numerals:

[0044] 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, 116c-Third fixed pulley, 116d-Fourth fixed pulley, 117-Intergroup fixed pulley, 118a-First movable pulley, 118b-Second 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 -first elastic element, 141b -force application column, 141c -second elastic element, 141d -support guide frame, 150 -first clutch, 160 -speed shifting mechanism, 161 -fixed speed ratio transmission, 162 -continuously variable transmission, 170 -generator motor, 171 -power cable, 180 -frame, 181 -base plate, 190 -elastic coupling;

[0045] 200-control cable;

[0046] 300-control system, 310-sensing unit, 311-speed sensor, 312-distance sensor, 313-force sensor, 320-operation controller, 330-grid control unit, 340-safety protection unit, 350-monitoring unit, 360-communication interface circuit, 370-user interface. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solutions and advantages of this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0048] On the contrary, this application covers any alternatives, modifications, equivalents, and solutions made within the spirit and scope of this application as defined by the claims. Furthermore, to facilitate a better understanding of this application, certain specific details are described in detail below in the detailed description of this application. Those skilled in the art will be able to fully understand this application without these details.

[0049] 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 orientations or positional relationships based on the orientations 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 limiting the present disclosure. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, 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, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0050] In the description of this disclosure, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this disclosure based on specific circumstances.

[0051] In the present disclosure, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being 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 the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0052] See also Figures 1 to 3 The first embodiment of the present disclosure provides a spring-gravity hybrid energy storage workstation 100 for a new energy power generation system, comprising a frame 180, a transmission shaft 130, a first clutch 150, a speed change mechanism 160, a generator motor 170, and a plurality of energy storage modules 140, all of which are located therein. Each energy storage module 140 is respectively equipped with a suspension module 110 and a mechanical transmission module 120.

[0053] Each energy storage module 140 is connected to the transmission shaft 130 through its corresponding suspension module 110 and mechanical transmission module 120 and is evenly arranged on both sides of the transmission shaft 130. A single energy storage module 140 has multiple energy storage sub-modules 141 arranged in an array, with the direction parallel to the transmission shaft 130 as rows and the direction perpendicular to the transmission shaft 130 as columns. The energy storage sub-modules in the same row or column are considered a group of energy storage sub-modules.

[0054] The energy storage submodule 141 includes a support guide frame 141d and a first elastic element 141a, a force column 141b, and a second elastic element 141c located therein and arranged in sequence along the vertical direction. The support guide frame 141d is fixedly connected to the frame 180. One end of the first elastic element 141a and the second elastic element 141c are respectively fixedly connected to the upper and lower ends of the support guide frame 141d, and the other ends of the first elastic element 141a and the second elastic element 141c are respectively fixedly connected to the upper and lower ends of the force column 141b. In the initial state, the first elastic element 141a and the second elastic element 141c are both in a free state, that is, neither undergoes elastic deformation, and the mass of the force column 141b is negligible relative to the mass of the first elastic element 141a and the second elastic element 141c.

[0055] 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 on the force column 141b. The adjacent groups in the energy storage module 140 are respectively connected. An inter-group fixed pulley 117 is configured to change the direction of the steel wire rope 115 in adjacent groups; one end of the steel wire rope 115 is fixed to the drum 114, and the other end passes through each pulley group and the inter-group fixed pulley 117 in sequence before being fixedly connected to the frame 180; as the number of turns of the steel wire rope 115 around the drum 114 changes, the force-applying columns 141b in the energy storage module 140 move synchronously, causing the first elastic element 141a and the second elastic element 141c to simultaneously undergo elastic deformation, causing changes in elastic potential energy and gravitational potential energy, thereby achieving energy storage and release;

[0056] 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 speed change mechanism 160 through a first clutch 150. The other end of the speed change mechanism 160 is connected to the generator motor 170 through an elastic coupling 190. The speed change mechanism 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.

[0057] In some embodiments, the energy storage workstation 100 includes a plurality of energy storage modules 140. The number of energy storage modules 140 is an even number ranging from 4 to 10, typically 4 or 6. Each energy storage module 140 is equipped with a suspension module 110 and a mechanical transmission module 120. Each energy storage module 140 and its associated suspension module 110 and mechanical transmission module 120 constitute a set of energy storage devices that can independently generate power for the drive shaft 130 or work together with multiple other energy storage devices to generate power for the drive shaft 130.

[0058] In some embodiments, the rack 180 as a whole is a box-type shell. In order to facilitate the arrangement of as many energy storage sub-modules 141 as possible in the box-type shell 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 connecting 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 module 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 within the frame 180), so that the drum 114 can arrange the rope correctly when winding the wire rope 115.

[0059] In a specific embodiment of the present disclosure, the bottom plate 181 of the rack 180 is divided into two by the axis of the transmission shaft 130 , and two sets of energy storage devices are arranged on each side of the transmission shaft 130 , for a total of four sets.

[0060] 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 transmit the rotation of the transmission shaft 130 to the energy storage module 140 to increase its elastic potential energy and gravitational potential energy, and can also transmit the torque of the elastic potential energy and gravitational potential energy of the energy storage module 140 to 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, and the second sprocket 125 rotates the first chain 124 through the chain Wheel 123, the first sprocket 123 rotates the reel 114 in the suspension module 110 through the second clutch 121, so that the elastic potential energy of the elastic element in the energy storage module 140 increases, and at the same time, as the center of gravity of the elastic element increases, its gravitational potential energy also increases synchronously (considering that the mass of the force column 141b is negligible relative to the mass of the two elastic elements connected to it, the change in the gravitational potential energy of the force column 141b is ignored); when energy release is required, the transmission route of the mechanical transmission module 120 is exactly opposite to that when storing energy. The second clutch 121 is switched on and off to connect and disconnect the suspension module 110 and the transmission shaft 130, thereby selectively connecting the corresponding energy storage module 140 to participate in energy storage or release. Specifically, when energy storage ends, the energy storage module 140 that has fully stored energy first brakes its suspension module 110, 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 no longer needed 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 prevent the energy storage module 140 from continuing to work on the transmission shaft 130 and causing the speed of the transmission shaft 130 to lose control. The second clutch 121 generally adopts an electromagnetic friction clutch or an electromagnetic dog clutch. 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 all have the same size, which is conducive to standardized production.

[0061] 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 relatively smooth 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 chain transmission to reduce noise and make the transmission smoother.

[0062] 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.

[0063] It is understandable that the provision of the one-way overrunning clutch 126 in this embodiment can prevent the braking of one or more energy storage modules 140 from affecting the continued operation of the transmission shaft 130 by the remaining unbraked energy storage modules 140. Specifically, when the first energy storage module in the energy storage workstation 100 is about to finish releasing energy, the second energy storage module switches to start releasing energy. Due to the use of the one-way overrunning clutch 126, the mechanical transmission module associated 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 associated with the second energy storage module on the transmission shaft 130. In particular, the mechanical transmission modules corresponding to the energy storage modules not participating in the energy release will not cause the efficiency of the energy storage workstation 100 to decrease during energy release due to the idling of the transmission shaft 130.

[0064] In some embodiments, the suspension module 110 further includes a brake 111 and a reel support 113. The reel support 113 is fixed to 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 via 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 no longer required to participate in energy storage or release, the second clutch 121 is used to disconnect the transmission shaft 130 from the reel 114, and the brake 111 is used to brake the reel 114, stopping the reel 114 from rotating. This allows the force application columns 141b and elastic elements in the corresponding energy storage module 140 to maintain their current state. The brake 111 may be in the form of an electromagnetic power-off brake, a drum brake, a butterfly brake, a dog brake, etc., and preferably an electromagnetic power-off brake is used.

[0065] Preferably, the pulley groups within the suspension module 110 have the same structure, each consisting of four fixed pulleys (116a-116d) and two movable pulleys (118a, 118b). Assuming that the number of rows of energy storage submodules 141 within the energy storage module 140 is n and the number of columns is j (wherein the value of j needs to be considered as too large will cause the arrangement of energy storage submodules 141 in one energy storage module 140 to affect two adjacent energy storage modules 140. The value of n can be larger, but if it is too large, the wire rope will be subjected to significant frictional resistance when it is wrapped around too many pulley groups). Then, the number of fixed pulleys in all the pulley groups used by the suspension module 110 to pull the energy storage modules 140 is 4×n×j, and the number of movable pulleys is 2×n×j. All pulleys in a single suspension module 110 are connected by a single wire rope 115. In each pulley group, the four fixed pulleys are arranged above the support guide frame 141d of a matching energy storage sub-module 141 and fixedly connected to the frame 180. The two movable pulleys are arranged on both sides of the support guide frame 141d of a matching energy storage sub-module 141 and are connected to the force column 141b through a connecting shaft 119 protruding from the two side walls of the support guide frame 141d. The two movable pulleys are rotatably mounted on the connecting shaft 119. Strip holes arranged in the vertical direction are formed on the two side walls of the support guide frame 141d, which are used to constrain the movement direction of the force column 141b and the elastic element connected to it to avoid collision and friction with the support guide frame 141d. Among them, the first fixed pulley 116a and the second fixed pulley 116b are located on one side of the support guide frame 141d, and the third fixed pulley 116c and the fourth fixed pulley 116d are located on the other side of the support guide frame 141d. The first fixed pulley 116a is parallel to the plane where the fourth fixed pulley 116d is located, and the second fixed pulley 116b and the third fixed pulley 116c are in the same plane and form a certain angle with the plane where the first fixed pulley 116a or the fourth fixed pulley 116d is located, which is generally an acute angle with a value between 22.5 degrees and 65 degrees. At the same time, the axial center position of the first fixed pulley 116a and the fourth fixed pulley 116d is lower than the axial center position of the second fixed pulley 116b and the third fixed pulley 116c. The steel wire rope 115 is led out and out of the fixed pulley group through the first fixed pulley 116a and the fourth fixed pulley 116d, and the steel wire rope 115 passing through the second fixed pulley 116b and the third fixed pulley 116c is ensured to be higher than the upper surface of the support guide frame 141d, so as to avoid the steel wire rope 115 from contacting the support guide frame 141d when crossing the upper end of the support guide frame 141d. The axis of the first fixed pulley 116a and the fourth fixed pulley 116d can be set to the same height, and the axis of the second fixed pulley 116b and the third fixed pulley 116c can be set to the same height. For the same group of energy storage submodules, in the pulley group matched with the two adjacent energy storage submodules, Figure 1Taking the first and second energy storage submodules of the first column of energy storage submodules shown as an example, the wire rope 115 is led out of the previous pulley group by the fourth fixed pulley 116d in the previous pulley group and introduced into the next pulley group by the first fixed pulley 116a in the next pulley group. It is advisable to arrange the fourth fixed pulley 116d of the previous pulley group and the first fixed pulley 116a of the next pulley group in the same plane and as close as possible to reduce the footprint of the energy storage module 140; for two adjacent groups of energy storage submodules, in the pulley groups provided in conjunction with the two adjacent energy storage submodules, Figure 1 Taking the energy storage submodules in the first column, second row, and second column, second row, and the energy storage submodules in the first column, third row, and second column, third row, as examples, the axles of the first fixed pulley 116a and the fourth fixed pulley 116d are parallel and as close together as possible, similarly reducing the footprint of the energy storage module 140. The movable pulleys in each pulley assembly are used to move the corresponding force-applying column 141b up and down within the support guide frame 141d under the traction of the wire rope 115, thereby causing elastic deformation of the elastic elements connected to the force-applying column 141b. Due to the characteristics of the movable pulleys, although the total ultimate force of a single energy storage module 140 (i.e., the sum of the elastic force generated by all elastic elements within a single energy storage module 140 and the force of gravity when the module reaches full load, either storing or releasing energy) is very large, the maximum tension borne by the wire rope 115 is only one-fourth of the ultimate force of a single energy storage submodule 141, significantly reducing the strength requirements of the wire rope 115. For ease of production, the fixed pulleys (116a-116) in the suspension module 110 and the inter-group fixed pulley 117 all adopt a unified style, with only different installation positions. The wheel part of each movable pulley (118a, 118b) also adopts the same style as the fixed pulley.

[0066] See also Figure 1The direction of the wire rope 115 between the drum 114 and the energy storage module 140 is as follows: one end of the wire rope 115 is wound on the drum 114, and the other end starts from the energy storage submodule in the first column and the first row of the energy storage module 140, and passes through the first fixed pulley 116a, the first movable pulley 119a, the second fixed pulley 116b, the third fixed pulley 116c, the second movable pulley 119b and the fourth fixed pulley 116d corresponding to the energy storage submodule in turn, and then passes through the corresponding pulley group of the energy storage submodule in 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 fourth fixed pulley of the energy storage submodule in the last row of the first column, and then passes around the first column and the second row of the energy storage submodule connected to the bottom plate 181 of the rack 180. The steel 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 direction opposite to that of the steel 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 then turns 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.

[0067] It can be understood that the distribution of the fixed pulley and the movable pulley adopted in this embodiment is particularly suitable for scenarios where the outer diameter of the elastic element is small and the movable pulley cannot be installed inside the force column 141b or the support guide frame 141d, that is, it is particularly suitable for scenarios where the cross-sectional area of ​​the energy storage sub-module 141 is small. By reducing the outer diameter of the support guide frame 141d of the energy storage sub-module 141 and increasing the height of the support guide frame 141d of the energy storage sub-module 141, the energy storage module can effectively reduce the footprint while maintaining a large energy storage density, thereby ensuring the miniaturization requirements of the elastic-gravity hybrid energy storage device. When the cross-sectional area of ​​the energy storage sub-module is large, two independently rotating movable pulleys can be coaxially installed in the internal cavity of the force column 141b or on the upper end surface of the force column 141b, and three coaxially installed independently rotating fixed pulleys are arranged above the support guide frame 141d to form a pulley group to meet the needs of introducing and leading out the wire rope. Similarly, by increasing the arrangement density of the energy storage sub-module 141, the energy storage density of the energy storage workstation 100 can be improved when the height of the support guide frame 141d is limited.

[0068] 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 workstation 100 is exactly the same. Figure 1 As can be seen, the energy storage submodules 141 are preferably arranged in a rectangular array, which is convenient for arranging the pulley group and passing the steel wire rope 115.

[0069] Preferably, the support guide frame 141d in the energy storage submodule 141 adopts a cylindrical barrel or a frame with other cross-sectional forms. The elastic element is completely located inside the support guide frame 141d. The internal cross-sectional dimension of the support guide frame 141d can be set to 1.06 to 1.08 times the cross-sectional dimension of the elastic element when it is in a free state, so as to avoid the outer ring of the compressed elastic element increasing after compression and rubbing against the inner wall of the support guide frame 141d. The internal height of the support guide frame 141d can be set to the sum of the total length of the first elastic element 141a and the second elastic element 141c in the free state and the axial length of all internal moving parts such as the force column 141b. The wall thickness is set mainly considering the structural strength and rigidity. When the energy storage workstation 100 generates the maximum force, the support guide frame 141d and the frame 180 are not allowed to deform, and material damage is not allowed to occur. The first elastic element 141a and the second elastic element 141c within the support guide frame 141d are both linear elastic elements. They can be a cylindrical helical compression spring and a cylindrical helical tension spring, respectively. Alternatively, they can be a linear spring assembly formed by connecting multiple springs in series or in parallel (using a linear spring assembly formed in series allows the energy storage submodule 141 to have a greater travel during energy release). Alternatively, they can be linear elastic components formed from elastic rubber or other polymer composite materials. Furthermore, elastic elements can be placed only on the upper or lower side of the force-applying column 141b. This approach offers lower energy density compared to placing elastic elements on both the upper and lower sides of the force-applying column 141b. The force-applying column 141b within the support guide frame 141d can be cylindrical. The cross-sectional dimensions of the first elastic element 141a, the force-applying column 141b, and the second elastic element 141c should ensure that they do not contact the sidewalls of the support guide frame 141d during their entire movement within the support guide frame 141d, thereby preventing energy loss and collision damage. When the force column 141b moves upward under the action of the wire rope 115 and the movable pulley, the first elastic element 141a on its upper side is compressed, and the second elastic element 141c on the lower side of the force column 141b is stretched. At the same time, the center of gravity of the elastic element moves upward, which will generate gravitational potential energy. Therefore, when a relatively high energy storage sub-module is used, compared with a pure elastic energy storage device, the gravitational potential energy generated by the elastic element of this embodiment during energy storage is used in the energy release process, thereby forming a hybrid energy storage module with elastic force as the main force and gravity as the auxiliary force.

[0070] It should be noted that the elastic elements in the energy storage submodule 141 can also be located partially inside and partially outside the support guide frame 141d. For example, if the elastic elements are linear leaf springs, the left and right ends of the two leaf springs are connected by hinges and arranged relative to each other to form a tensile elastic element. The intermediate bands of the two leaf springs are connected to the steel wire rope 115. The tensile elastic element is initially elastically non-deformable. When the steel wire rope 115 is tightened in both the upward and downward directions, the tensile elastic element undergoes tensile deformation, taking on an olive shape. The force-applying column 141b is located at the top of all the elastic elements, and a movable pulley is mounted on the upper end surface of the force-applying column 141b. The side surfaces of all the leaf springs can slide up and down along the inner surface of the support guide frame 141d, while the portion of the leaf spring near the hinge extends outside the support guide frame 141d and does not interfere with the support guide frame 141d during deformation and sliding. Alternatively, the two leaf springs can be replaced with two steel beams with I-shaped or square cross-sections, which can reduce the deadweight while increasing the elastic force.

[0071] In some embodiments, the transmission mechanism 160 within the energy storage workstation 100 includes a fixed-ratio transmission 161 and a continuously variable transmission 162. The low-speed shaft of the fixed-ratio transmission 161 is connected to one end of the drive shaft 130 via a first clutch 150, while the high-speed shaft of the fixed-ratio transmission 161 is connected to one end of the continuously variable transmission 162. The other end of the continuously variable transmission 162 is connected to the generator motor 170 via an elastic coupling 190. The fixed-ratio transmission 161 is used to convert the high speed of the generator motor 170 to the low speed required by the reel 114 in the suspension module 110 during energy storage, and similarly, to convert the low speed of the reel 114 in the suspension module 110 to the high speed required by the generator motor 170 during energy release. The fixed-ratio transmission typically has a speed range between 1 / 45 and 1 / 120 to ensure that the speed of the generator motor 170 remains close to its rated speed. The difference, particularly the speed adjustment required to eliminate linear variations in the applied force of the energy storage module 140, is handled by the continuously variable transmission 162. The continuously variable transmission 162 is used to ensure that the rotational speed of the transmission shaft 130 undergoes the required linear change, while also maintaining the torque and rotational speed of the generator motor 170 stable when the force of the elastic element in the energy storage module 140 involved in energy storage or release undergoes a linear change, causing the moving speed of the force-applying column 141b to undergo an opposite linear change. When energy storage begins, the resultant force of the elastic force generated by the elastic element in the energy storage module 140 and the gravity increases linearly. Since the resultant force of the elastic force and gravity on the elastic element is small, in order to ensure a uniform rotational speed of the generator motor 170, the speed ratio of the continuously variable transmission 162 should enable the drum 114 to wind the wire rope 115 at a higher rotational speed; when the resultant force of the elastic force of the elastic element and gravity gradually approaches its maximum limit, the speed ratio of the continuously variable transmission 162 should enable the drum 114 to wind the wire rope 115 at a gradually decreasing rotational speed, that is, by adjusting the speed ratio of the continuously variable transmission 162, the speed of the drum 114 is made to wind the wire rope 115 in a gradually decreasing manner, thereby keeping the torque and rotational speed of the generator motor 170 stable and ensuring that the rotational speed of the generator motor 170 is controlled within a specified range. Correspondingly, when energy release begins, the combined force of the elastic force generated by the elastic elements in the energy storage module 140 and gravity decreases linearly. To ensure a uniform rotational speed of the generator motor 170, the speed ratio of the continuously variable transmission 162 is adjusted to gradually increase the rotational speed of the drum 114, thereby releasing the wire rope 115. This ensures that the movement speed of the force-applying column 141b increases linearly, thereby maintaining stable torque and rotational speed of the generator motor 170. Optionally, the continuously variable transmission 162 has a speed adjustment range of 1 / 1.45 to 1 / 7.25, so that the ratio of the maximum force generated by the energy storage module alone to the minimum force required to properly generate electricity for the generator motor 170 does not exceed the difference between the maximum and minimum speed ratios of the continuously variable transmission 162, i.e., 7.25 - 1.45 = 5.8.The continuously variable transmission 162 is usually a planetary friction type continuously variable transmission, a metal belt type continuously variable transmission or a hydraulic coupling type transmission. In this embodiment, the continuously variable transmission 162 is a planetary friction type continuously variable transmission, and its input shaft and output shaft are coaxial.

[0072] In some embodiments, the energy storage workstation 100 adopts a two-stage energy release mode:

[0073] During the first stage of energy release, each energy storage module 140 in the energy storage workstation 100 releases energy in sequence. When the energy released by the previous energy storage module barely reaches the energy required to drive the generator motor 170 for normal operation, the suspension module 110 of the previous energy storage module is braked, the suspension module 110 is disconnected from the transmission shaft 130, and the next energy storage module is connected to perform work on the transmission shaft 130. When all energy storage modules have completed their individual energy releases, the first stage of energy release ends and the second stage of energy release begins.

[0074] During the second stage of energy release, all energy storage modules in the energy storage workstation 100 simultaneously work on the transmission shaft 130. When the energy released by all energy storage modules reaches the energy required to drive the generator motor 170 for normal operation, the power cable 171 is disconnected to brake the generator motor 170, brake all suspension modules 110 and disconnect the suspension module 110 from the mechanical transmission module 120, and the energy storage workstation 100 completes energy release.

[0075] See also Figure 4 、 Figure 5 The second embodiment of the present disclosure provides a spring-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 energy storage workstation 100 being connected to the control system 300 via a control cable 200; each energy storage workstation 100 adopts Figures 1 to 3 The energy storage workstation shown, the control system 300 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.

[0076] 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.

[0077] In some embodiments, the elastic-gravity hybrid energy storage device can include three or more energy storage stations 100, or even hundreds, to fully accommodate renewable energy sources (such as wind and photovoltaic power). When the power grid demands power, the control system 300 causes the energy storage devices of varying storage capacities and quantities within each energy storage station 100 to work on their respective drive shafts 130. This allows the elastic-gravity hybrid energy storage device to generate power for an extended period of time within a certain power range, thereby achieving controlled and stable power delivery to the power grid.

[0078] In some embodiments, the control system 300 includes several sensing 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. Each sensing unit 310 is disposed in a corresponding energy storage workstation 100 and includes a rotation 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. When storing energy, the resultant force of the elastic force and gravity on each elastic element in the energy storage module 140 increases linearly. When the speed of the generator motor 170 detected by the speed sensor 311 is lower than the set speed range, the operation controller 320 adjusts the continuously variable transmission 162 to gradually increase the torque of the input transmission shaft 130 so that the speed of the generator motor 170 operates within the set speed range; when releasing energy, the resultant force of the elastic force and gravity on each elastic element in the energy storage module 140 decreases linearly. When the speed of the generator motor 170 detected by the speed sensor 311 is lower than the set speed range, the operation controller 320 gradually increases the torque acting on the shaft of the generator motor 170 by adjusting the continuously variable transmission 162 so that the speed of the generator motor 170 is within the specified range. The distance sensor 312 is used to measure the distance between the upper surface of the force column 141b and the inner surface of the upper section of the support guide frame 141d, so as to sense the real-time energy storage or release margin of the energy storage module 140; during energy storage, when the distance measured by the distance sensor 312 indicates that the force has reached the maximum limit value (if the distance between the upper surface of the force column 141b and the inner surface of the upper end of the support guide frame 141d continues to decrease, it will cause the first elastic element or the second elastic element to be damaged), the control operator 320 uses the brake 111 to brake The reel 114 in the suspension module 110 controls the second clutch 121 to disconnect the transmission chain between the transmission shaft 130 and the suspension module 110; when releasing energy, when the distance measured by the ranging sensor 312 indicates that the force has reached the minimum limit values ​​corresponding to the first stage energy release and the second stage energy release respectively, the control operator 320 uses the brake 111 to brake the reel 114 in the suspension module 110, and controls the second clutch 121 to disconnect 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 to determine whether the energy storage device is stuck or the wire rope is broken, or to reflect whether the change in tension within a specified range 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 reel 114 in the suspension module 110, and at the same time controls the second clutch 121 to disengage the transmission chain between the drive shaft 130 and the suspension module 110.The grid-connected control unit 330 is used to connect the electrical energy generated by the elastic-gravity hybrid energy storage device to the main power grid. The safety protection unit 340 is used to handle emergencies. When parameters exceed the preset operating 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 engaged, the first clutch 150 and the second clutch 121 are disconnected, and the energy storage workstation 100 with the problem is shut down. The monitoring unit 350 is used to monitor the operating 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 operation of the elastic-gravity hybrid energy storage device of this embodiment, including but not limited to data communication between the control system 300 and the energy storage station 100, as well as data communication and control signals between the operation controller 320 and the sensor unit 310, brake 111, second clutch 121, first clutch 150, and generator motor 170. The user interface 370 is used to input user commands, change parameters, and display the operating status, data, and fault conditions of the energy storage station 100. The human-computer interaction and display functions of the user interface 370 are implemented through a computer user display system and real-time traceability system. As the core of the control system 300, the operation controller 320 is connected to the sensor unit 310, grid connection control unit 330, safety protection unit 340, monitoring unit 350, communication interface circuit 360, and user interface 370. It performs operational monitoring, including starting and stopping the energy storage station 100, controlling other functional modules, and monitoring grid connection. The operation controller 320 primarily implements 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.

[0079] In some embodiments, the operation process of the elastic-gravity hybrid energy storage device includes:

[0080] 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: 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 fixed speed ratio transmission 161 in the speed change mechanism 160 to increase the torque to drive the transmission shaft 130, and the transmission shaft 130 transfers the torque to the transmission shaft 130 through the mechanical transmission module 120. The torque is transmitted to the suspension module 110: the transmission shaft 130 rotates the second sprocket 125 through the one-way overrunning clutch 126 thereon, 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 is pulled, so that the force column 141b moves upward, and at the same time, the first elastic element 141a produces compressive elastic deformation and the second elastic element 141c produces tensile elastic deformation, and part of the mass of the elastic element begins to produce The gravitational potential energy is generated, and the combined force of the elastic force of each elastic element of the first energy storage module and the gravity increases linearly. When the control system 300 senses through the distance sensor 312 that all the force-applying columns 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. Then, 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. , the second clutch 121 in the mechanical transmission module 120 is engaged, and the transmission shaft 130 stores energy in the two energy storage modules 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 then activates the energy storage devices in the remaining energy storage workstations 100 until all the energy storage workstations 100 of the entire elastic-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 runs out of energy storage capacity, the control system 300 disconnects the power cable 171 of the generator motor 170 to brake the generator motor 170, and simultaneously brakes all the energy storage modules 140 that are storing energy and disengages the second clutch 121 and the first clutch 150. 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, and finally the elastic-gravity hybrid energy storage device is fully loaded.

[0081] During the energy release operation, it is divided into two stages of energy release mode: 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 workstation 100, the control system 300 first connects the power cable 171 to start the generator motor 170 and enters the first stage of energy release mode, that is, each energy storage module 140 in the energy storage workstation 100 releases energy separately (that is, works on the transmission shaft 130). First, the control system 300 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 its matching mechanical transmission module 120 and connects the transmission shaft The first clutch 150 between 130 and the speed change mechanism 160, and the elastic potential energy generated by the first elastic element 141a and the second elastic element 141c and the gravitational potential energy generated by part of the mass of each energy storage submodule 141 of the energy storage module 140 drive the force column 141b to move downward, and the wire rope 115 is pulled by the corresponding movable pulley. 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 in sequence 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. The transmission shaft 130 transmits the motion to the low-speed shaft of the fixed-speed ratio transmission 161 in the speed change mechanism 160 through the first clutch 150, and then transmits the motion to the continuously variable transmission 162 through the high-speed shaft of the fixed-speed ratio transmission 161. The continuously variable transmission 162 transmits the stable torque to the generator motor 170 by speed regulation, thereby driving the generator motor 170 to rotate and generate electricity. The resultant force of the elastic force of each elastic element of the first energy storage module and the gravity decreases linearly. When the force column in the first energy storage module 140 reaches the second set position, it indicates that the energy currently released by the first energy storage module can barely reach the energy required to drive the normal operation of the generator motor 170, and then the control The system 300 controls its associated brake 111 to brake the reel 114 and disengage the second clutch 121. Simultaneously, the second energy storage module 140 begins releasing energy slightly before the brake 111 of the first energy storage module 140 brakes the reel 114, ensuring stable power generation by the generator motor 170. Because the mechanical transmission module 120 associated with the first energy storage module 140 connects to the drive shaft 130 via a one-way overrunning clutch 126, the mechanical transmission module 120 associated with the second energy storage module 140 does not hinder the rotation of the drive shaft 130 after the first energy storage module 140 has released energy.Until all the energy storage modules 140 in the energy storage workstation 100 have released their energy individually, the control system 300 controls all the energy storage modules 140 to work together, that is, enters the second stage of energy release, and the resultant force of the elastic force of all the elastic elements in the energy storage workstation and the gravity continues to decrease linearly. When the force application column 141b in all the energy storage modules in the energy storage workstation 100 reaches the third set position, it indicates that the energy currently released by the energy storage workstation 100 is reduced to the energy required to barely drive the generator motor 170 to generate electricity normally, then 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 storage workstation 100 ends releasing energy; if the elastic force-gravity If the elastic-gravity hybrid energy storage device still needs to release energy, the control system 300 activates the remaining energy storage stations 100 that are not releasing energy, and continues to release energy according to the above two-stage energy release mode until the entire elastic-gravity hybrid energy storage device achieves full load energy release. If a single or part of the energy storage stations 100 are in the process of releasing energy and unexpectedly no longer need to release energy, the control system 300 first disconnects the power cable 171 to brake the generator motor 170 and simultaneously brake the energy storage modules 140 in the energy storage stations 100 that are currently releasing energy. The elastic elements stop moving in their current positions, and the energy release operation is suspended. If there is a subsequent energy release request, the energy storage stations 100 whose energy release operation was suspended resume energy release, achieving full load energy release for the energy storage stations 100, and ultimately achieving full load energy release for the elastic-gravity hybrid energy storage device.

[0082] Furthermore, when each energy storage module 140 in the energy storage workstation 100 releases energy individually, that is, each energy storage module 140 releases energy in sequence, the ratio of the maximum limit force of all the first elastic elements 141a and the second elastic elements 141c in a single energy storage module 140 to the minimum limit force that can just enable the generator motor 170 to generate power normally should be controlled within the speed regulation range of the speed change mechanism 160 (for example, it is set between 1 and 5.8 in this embodiment). This can conveniently achieve stability of the torque and speed of the generator motor 170 within the speed regulation range of the continuously variable transmission 162. The residual force of the energy storage module 140 after two stages of energy release is much smaller than the residual force of the energy storage module 140 after only the first stage of energy release. If N energy storage modules 140 are provided in a single energy storage workstation 100, without considering the influence of friction, the residual force of each energy storage module 140 after two stages of energy release is only 1 / N of the residual force of all energy storage modules at the end of the first stage.

[0083] It can be understood that this embodiment adds a second-stage energy release mode in which all energy storage modules work together during energy release, so that the elastic potential energy and gravitational potential energy generated during energy storage in the elastic-gravity hybrid energy storage device can be fully converted into electrical energy, thereby increasing the effective energy release capacity.

[0084] Throughout this specification, reference to terms such as "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 illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0085] Although the embodiments of the present disclosure have been shown and described, it will be appreciated by those skilled in the art 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 spring-gravity hybrid energy storage workstation for a new energy power generation system, characterized in that: It includes a frame, a transmission shaft, a first clutch, a speed change mechanism, a generator motor and several energy storage modules located therein, 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 comprises 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 considered a group of energy storage sub-modules. The energy storage submodule includes a support guide frame and a force column located therein, an elastic element connected to the force column is provided on at least one of the upper side and the lower side of the force column, and the support guide frame is fixedly connected to the frame; 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 sub-module in the energy storage module, each pulley group consists of a plurality of fixed pulleys and at least one movable pulley installed on the force-applying column, 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 force-applying columns in the energy storage module move synchronously, so that each elastic element simultaneously generates elastic deformation and causes changes in elastic potential energy and gravitational potential energy, 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 speed change mechanism through the first clutch, and the other end of the speed change mechanism is connected to the generator motor through an elastic coupling. The speed difference between the transmission shaft and the set speed of the generator motor is matched by the speed change mechanism, 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 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.

3. 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.

4. 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 is matched with the inner hole of the second sprocket, the inner hole of the one-way overrunning clutch is sleeved on the transmission shaft, and motion is transmitted between the first sprocket and the second sprocket through the chain.

5. The energy storage workstation according to claim 1, characterized in that: The suspension module further comprises a brake and a reel support, wherein 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.

6. The energy storage workstation according to claim 1, characterized in that: The support guide frame is a cylindrical structure, and each pulley group in the suspension module is composed of 4 fixed pulleys and 2 movable pulleys respectively. All pulleys in a single suspension module are connected by a steel wire rope. The 4 fixed pulleys are arranged above the support guide frame of a matching energy storage submodule and are fixedly connected to the frame. The first fixed pulley is parallel to the plane where the fourth fixed pulley is located, the second fixed pulley and the third fixed pulley are in the same plane and form a certain angle with the plane where the first fixed pulley or the fourth fixed pulley is located, and the axial center position of the first fixed pulley and the fourth fixed pulley is smaller than the axial center position of the second fixed pulley and the third fixed pulley. Low; two movable pulleys are arranged on both sides of the supporting guide frame of a matching energy storage submodule and are connected to the force column through connecting shafts protruding from the two side walls of the supporting guide frame. The two movable pulleys are rotatably sleeved on the connecting shafts, and strip holes arranged in the vertical direction are formed on the two side walls of the supporting guide frame to constrain the movement direction of the force column and the elastic element connected to it; the steel wire rope is respectively introduced into and led out of each pulley group by the first fixed pulley and the fourth fixed pulley. In a single pulley group, the steel wire rope passes through the first fixed pulley, the first movable pulley, the second fixed pulley, the third fixed pulley, the second movable pulley and the fourth fixed pulley in sequence.

7. The energy storage workstation according to claim 6, characterized in that: An angle between a plane where the second fixed pulley and the third fixed pulley are located and a plane where the first fixed pulley or the fourth fixed pulley is located is an acute angle, which is 22.5° to 65°.

8. The energy storage workstation according to claim 1, characterized in that: Each fixed pulley in the pulley group is arranged above the supporting guide frame of a matching energy storage submodule and is fixedly connected to the frame, and the movable pulley is arranged in the internal cavity or the upper end surface of the force column of a matching energy storage submodule.

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 made opposite by the inter-group fixed pulley.

10. The energy storage workstation according to claim 1, characterized in that: The elastic elements are all linear elastic elements.

11. 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.

12. The energy storage workstation according to claim 1, characterized in that: The speed change mechanism includes a fixed speed ratio transmission and a continuously variable transmission. The low-speed shaft of the fixed speed ratio transmission is connected to one end of the transmission shaft through the first clutch, the high-speed shaft of the fixed speed ratio transmission is connected to one end of the continuously variable transmission, and the other end of the continuously variable transmission is connected to the generator motor through the elastic coupling.

13. The energy storage workstation according to any one of claims 1 to 12, characterized in that: The energy storage workstation adopts a two-stage energy release mode. During the first stage of energy release, each energy storage module in the energy storage workstation releases energy in sequence. When the energy released by the previous energy storage module barely reaches the energy required to drive the generator motor to operate normally, the suspension module of the previous energy storage module is braked to disconnect the suspension module from the transmission shaft, and the next energy storage module is connected to perform work on the transmission shaft. When all energy storage modules have completed their individual energy release in sequence, the first stage of energy release ends and the second stage of energy release begins. During the second stage of energy release, all energy storage modules in the energy storage workstation simultaneously work on the transmission shaft. When the energy released by all energy storage modules reaches the energy required to drive the generator motor to operate normally, the power cable is disconnected to brake the generator motor, all suspension modules are braked and the suspension module is disconnected from the mechanical transmission module, and the energy storage workstation completes energy release.

14. A spring-gravity hybrid energy storage device for a new energy power generation system, characterized in that: It includes a control system and multiple energy storage workstations, each energy storage workstation 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 13; 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.

15. The energy storage device according to claim 14, 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 force-applying column, 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 handle emergencies and, when the parameters exceed the preset working range, promptly shut down the energy storage workstation with the problem; The monitoring unit is used to monitor the working status of the energy storage workstation in real time and transmit 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-stop control, control of various electronic components and power grid monitoring, wherein the operation controller adjusts the speed change mechanism according to the speed detected by the speed sensor so that the speed of the generator motor operates 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.

16. The energy storage device according to claim 14, 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 at the same time connects the power cable to start the generator motor. By controlling the speed change mechanism, the speed of the drum is made to wind the wire rope in a gradually decreasing manner. The resultant force of the elastic force of each elastic element of the first energy storage module and the gravity increases linearly. When the force column reaches the first set position, it is determined that all the 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 each 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 operates in the same order as the first energy storage module. Start the remaining energy storage modules until all energy storage modules in the opened energy storage workstation have completed energy storage, and 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 yet 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 unexpectedly there is no energy storage capacity, the control system disconnects the power cables to brake the generator motor, and at the same time brakes all suspension modules that are storing energy and disconnects the transmission lines between all 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 has been 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; The energy release operation is divided into two stages: 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 and enters the first stage energy release mode, that is, each energy storage module in the energy storage workstation releases energy separately. 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 line between the first energy storage module and the generator motor. By controlling the speed change mechanism, the speed of the drum is gradually increased to release the wire rope, so that the generator motor rotates to generate electricity. The resultant force of the elastic force of each elastic element of the first energy storage module and the gravity decreases linearly. When the force column in the first energy storage module reaches the second set position, it indicates that the energy currently released by the first energy storage module barely reaches the energy required to drive the normal operation of the generator motor. The control system brakes the suspension module corresponding to the first energy storage module and disconnects the transmission line between the first energy storage modules and the drive shaft. The first stage energy release of the first energy storage module ends, and the control system performs the same operation to make the remaining energy storage modules perform the first stage potential energy in turn until they are opened. After all energy storage modules in the energy storage workstation complete the first phase of energy release, the energy storage workstation enters the second phase of energy release mode. During the second phase of energy release, the control system controls all energy storage modules in the activated energy storage workstation to release energy simultaneously. When the force-applying columns in all energy storage modules in the energy storage workstation reach the third set position, indicating that the energy currently released by the energy storage workstation barely meets the energy required to drive the generator motor for normal operation, the control system disconnects the power cables in the energy storage workstation to brake the generator motor, brakes all suspension modules, and disconnects the transmission lines between each energy storage module and the generator motor, thus completing the energy release of the energy storage workstation. If the energy storage workstation is in the process of energy release and unexpectedly encounters a situation where energy release is no longer required, the control system first disconnects the power cables and brakes the generator motor, simultaneously brakes the suspension module that is currently releasing energy, and disconnects the transmission lines between all energy storage modules that are currently releasing energy and the generator motor, thereby suspending the energy release operation of the energy storage workstation. If there is a subsequent energy release requirement, the energy storage workstation whose energy release operation has been suspended will continue the energy release operation until the energy storage workstation achieves full load energy release, ultimately achieving full load energy release of the energy storage device.

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