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

Abstract

The invention provides an elastic force-gravity hybrid energy storage workstation for a new energy power generation system, the elastic force-gravity hybrid energy storage workstation comprises a rack, and a transmission shaft, a generator motor and a plurality of energy storage devices which are located in the rack, and each energy storage device comprises an energy storage module, a suspension module and a mechanical transmission module which are arranged in a matched manner; the energy storage modules are connected with the transmission shaft through the matched suspension modules and the matched mechanical transmission modules and are evenly arranged on the two sides of the transmission shaft, and elastic elements are arranged in the energy storage modules. When the elastic element moves upwards under the action of the suspension module and elastically deforms, elastic potential energy and gravitational potential energy are generated, and energy storage is achieved. When elastic potential energy and gravitational potential energy formed by elastic elements in the energy storage modules act on the suspension module to enable the generator motor to rotate to generate power, energy release is achieved. According to the invention, large-capacity and multi-mode energy storage and energy release can be realized, the application scene is wide, the energy storage density is large, and the integration level is high.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind power generation and kinetic energy storage, and in particular 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. Since they come from nature, they will not be exhausted. This characteristic makes wind power generation and photovoltaic power generation a good choice for sustainable power supply. Compared with fossil fuel power generation, wind power generation and photovoltaic power generation can significantly reduce the emission of carbon dioxide and other greenhouse gases, which helps to mitigate the impact of global warming. However, affected by natural and technical factors, wind power generation and photovoltaic power generation are intermittent, random, and poorly dispatchable, which will cause a series of power quality problems. First, when wind power generation and photovoltaic power generation are affected by weather and the output power fluctuates, it will cause voltage fluctuations on the wind farm transmission line, and then cause grid voltage fluctuations; when the output power of the wind power generation system is large, flicker will also occur. Secondly, since the output of wind power generation and photovoltaic power generation is somewhat random, as the proportion of these two new energy sources in the total power generation of the power grid continues to increase, there may be frequency fluctuations in the power grid, which will have a bad impact on the power system and its users. In addition, since wind power generation and photovoltaic power generation both use a large number of power electronic equipment, they will generate a large number of harmonics and DC components. After harmonics are injected into the power system, they will cause voltage distortion in the power grid system and affect the power quality of the entire power grid system. When the proportion of these two new energy sources is not large, the above defects can be controlled within the range allowed by the power grid through modern power electronics technology; when these two new energy sources are connected to the grid on a large scale, it will have a great impact on the power system. Therefore, the power grid must control the access to these two new energy sources within a controllable range to minimize the adverse effects. This not only restricts the construction scale and development speed of these two new energy sources, but also leads to coal-fired power plants that are more damaging to the environment and have a larger proportion of carbon emissions as the main power generation to ensure the smooth operation of the power grid. With the continuous development of new energy power generation, part of the power generation capacity of the above two new energy sources is often not utilized, so that new energy power generation companies cannot obtain the expected investment returns. To this end, measures have been taken to develop and promote new energy storage technologies and supporting new energy storage power stations to improve the utilization rate of new energy, thereby achieving energy conservation and environmental protection. Secondly, new energy storage technologies can improve the reliability and stability of energy. Since energy storage power stations using new energy storage technologies require large capital investments, they currently play three main roles: First, balancing electricity supply and demand. Energy storage power stations can store electricity during peak electricity demand to balance electricity supply and ensure the stability of the power network, which helps reduce the risk of power outages and improve the reliability of the power system. Second, integrating renewable energy: Renewable energy such as wind and solar energy are volatile. Energy storage power stations can capture and store excess electricity to provide electricity during unstable periods. Third, frequency regulation and backup power supply. Energy storage power stations can be used as frequency regulation equipment for the power system to quickly respond to fluctuations in electricity demand.However, this cannot completely eliminate the above-mentioned adverse effects of these two types of renewable energy generation on the power grid. For the stability of the entire power grid and high power quality, renewable energy can only occupy a small share in the power supply. The traditional power generation method based on coal-fired power generation is still the main means of power generation because the power generation process is fully controllable and the power quality is excellent. This is contrary to the original intention of vigorously developing renewable energy. Therefore, a storage device with good economy and safety is used between the renewable energy power station and the main power grid to completely absorb the unstable power generated by photovoltaic and wind power generation, and then generate electricity according to the needs of the power grid. It can provide stable power for a period of time, which can solve the above problems well. For this reason, people are also trying to study elastic energy storage technology.

[0003] The basic principle of elastic energy storage technology is to use electric energy to do work on the motor, drive the elastic element to produce elastic deformation, and convert electric energy into elastic potential energy; when generating electricity, use elastic force to do work to drive the generator to rotate, thereby converting elastic potential energy into electric energy. The elastic and gravity hybrid energy storage device developed based on the basic principle of elastic energy storage has the advantages of safety, fast response, large energy storage capacity, and long life. A more common way is to use vortex springs, vortex spring shafts and vortex spring housings to build a vortex spring box, and then form an energy storage workstation together with a generator motor, and finally form an energy storage device with multiple energy storage workstations and a control system. Due to the limitation of the vortex spring energy storage capacity, the energy storage capacity of each energy storage workstation is not large. When releasing energy, as the vortex springs of each vortex spring box are released one after another, the torque value generated fluctuates. In order to increase the energy storage capacity, there is also a way to connect the vortex spring box with built-in vortex springs 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 sequence. As energy storage solutions for new energy sources, these two technical solutions have obvious shortcomings: the energy release time of the former method is too short, and the torque value fluctuates greatly. If 1 is used to represent the torque unit generated by the vortex spring box that can drive the subsequent transmission device and the generator motor, the ratio of the maximum value to the minimum value of the torque generated by the vortex spring box is 3 to 1.2; although the energy release time of the series vortex spring box method is longer, the ratio of the maximum value to the minimum value of the torque generated is also 3 to 1.2. These two methods put forward extremely high requirements on the control system of the energy storage workstation, because the generator requires the input mechanical speed and torque to be basically stable and no large fluctuations are allowed. It is difficult to meet the requirements by purely mechanical speed regulation. Generally, power electronics technology is used to keep the speed of the generator stable, which will inevitably consume additional electric energy and reduce the energy conversion efficiency of the energy storage unit. In addition, due to the low energy storage density of a single vortex spring and the short energy release time, the vortex spring box series generally adopts a horizontal layout, and the equipment occupies a large area. Due to the low energy storage density, the one-time investment of the energy storage device converted into unit electricity is also large. The above reasons have also led to the fact that elastic energy storage technology has not been widely used in new energy power generation. Summary of the invention

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

[0005] To this end, the present disclosure provides 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 electric energy, the above-mentioned elastic-gravity hybrid energy storage device releases energy, and 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 comprehensively establishing a power supply pattern dominated by new energy and reducing the pollution of coal-fired power plants to the environment.

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

[0007] The first aspect of the present disclosure provides an elastic-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 a plurality of energy storage modules all located therein, each energy storage module being respectively equipped with a suspension module and a mechanical transmission module;

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

[0009] The energy storage submodule comprises a support guide frame and a force-applying column located therein, an elastic element connected to the force-applying column is provided on at least one of the upper and lower sides of the force-applying 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 submodule 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, each force-applying column in the energy storage module moves synchronously, so that each elastic element is elastically deformed at the same time 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 the pulleys in a single suspension module are connected by a steel wire rope, and the 4 fixed pulleys are arranged above the supporting 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 position of the first fixed pulley and the fourth fixed pulley is lower 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 a supporting guide frame of a matching energy storage submodule and are connected to the force column through a connecting shaft protruding from the two side walls of the supporting guide frame, and 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 introduced into and led out of each pulley group by the first fixed pulley and the fourth fixed pulley respectively, and 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 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.

[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 opposite through 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 transmission 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 and individually. 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, the suspension module is disconnected from the transmission shaft, and the next energy storage module is connected to work on the transmission shaft. When all energy storage modules have completed the energy release in sequence and individually, the first stage of energy release ends and enters the second stage of energy release.

[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 modules are 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 of which is 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 problems is shut down in time; the monitoring unit is used to monitor the working status of the energy storage workstation in real time, and transmit the data to the operation controller, the safety protection unit and the communication interface circuit. A full protection unit and the user interface; the communication interface circuit is used to realize data communication during the operation of the energy storage device; the user interface is used to input user instructions, change parameters, and display the operating status, data and fault conditions of the energy storage workstation; the operation controller is used for operating monitoring of the energy storage workstation, including start-stop control, control of various electronic devices 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 runs within the set speed range, the operation controller senses the real-time energy storage or energy release margin of the energy storage module according to the distance detected by the distance measuring sensor to control the corresponding suspension module, and the operation controller also controls the corresponding suspension module according to the tension sensed by the force sensor.

[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 simultaneously connects the power cable to start the generator motor. The speed of the drum is controlled to gradually reduce the speed of the winding wire rope by controlling the speed change mechanism. 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. The remaining energy storage modules are started until all the energy storage modules in the opened energy storage workstations 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 achieved full-load energy storage, and when all energy storage workstations are fully loaded with energy storage, the energy storage operation is completed; when a single or part of the energy storage workstations are storing energy and there is an unexpected lack of energy storage capacity, the control system disconnects the power cables to brake the generator motor, and at the same time brakes all the suspension modules that are storing energy and disconnects the transmission routes between all the energy storage modules that are storing energy and the generator motor, and the energy storage operation of the energy storage workstation is suspended. If there is a subsequent energy storage requirement, the energy storage workstation whose energy storage operation is suspended will continue the energy storage operation until the full-load energy storage of the energy storage workstation is achieved, and finally the full-load energy storage of the energy storage device is achieved;

[0033] During the energy release operation, there are two stages of energy release mode:

[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, and releases the wire rope in a gradually increasing manner by controlling the speed change mechanism to make the reel rotate and generate electricity. The combined 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 generator motor to operate normally. Then 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 transmission shaft. The first stage energy release of the first energy storage module ends, and the control system sequentially causes the remaining energy storage modules to perform the first stage potential energy according to the same operation until it is opened. The first stage of energy release of all energy storage modules in the energy storage workstation is completed, and the energy release mode of the second stage is entered; during the second stage of energy release, the control system controls all energy storage modules in the opened energy storage workstation to release energy at the same time. When the force columns in all energy storage modules in the energy storage workstation reach the third set position, it indicates that the energy currently released by the energy storage workstation barely reaches the energy required to drive the generator motor to operate normally, then the control system disconnects the power cable in the energy storage workstation to brake the generator motor, brake all suspension modules, and disconnect the transmission route between each energy storage module and the generator motor, and the energy release of the energy storage workstation is completed; when the energy storage workstation is in the process of energy release, if there is an unexpected situation that energy release is not required, the control system first disconnects the power cable and brakes the generator motor, and at the same time brakes the suspension module that is releasing energy and disconnects the transmission route between all energy storage modules that are releasing energy and the generator motor, and the energy release operation of the energy storage workstation is suspended. If there is a subsequent energy release requirement, the energy storage workstation whose energy release operation is suspended continues the energy release operation until the full load energy release of the energy storage workstation is achieved, and finally the full load energy release of the energy storage device is achieved.

[0035] The present disclosure has the following characteristics 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 stepless 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 small within a certain period of time, the elastic-gravity hybrid energy storage device starts a single or a small number of energy storage stations to participate in power generation; in the elastic-gravity hybrid energy storage device, a single or multiple energy storage stations can participate in energy storage or release at the same time, all energy storage stations can participate in energy storage or release at the same time, a single energy storage station can participate in energy storage or release in succession, and some energy storage stations can participate in energy storage or release in succession as a whole. This can not only ensure that the wind farm can still store energy in the case of light wind or changing wind speed or the photovoltaic power plant can still store energy in the case of low-intensity light or changing light intensity, but also meet the main power grid's requirement that the elastic-gravity hybrid energy storage device must have 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 new energy power generation on the main power grid and creating conditions for increasing the proportion of the above two types of new energy power generation in the power grid.

[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 limit 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 limit 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 small elastic element diameters that are not convenient for arranging movable pulley groups 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 in which all energy storage modules work together is added during energy release, 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 1It is a top view schematic diagram of an elastic-gravity hybrid energy storage workstation for a new energy power generation system provided by an embodiment of the first aspect of the present disclosure. Due to the limitation of the drawing width, some energy storage units and racks located on the upper side of the transmission shaft are omitted in this figure;

[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 It is a layout schematic diagram of an elastic-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 A schematic diagram of the structure 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-inter-group 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 column, 141c-second elastic element, 141d-support guide frame, 150-first clutch, 160-speed change mechanism, 161-fixed speed ratio transmission, 162-continuously variable transmission, 170-generator motor, 171-power cable, 180-frame, 181-bottom 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-connected 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 solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0048] On the contrary, the present application covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present application as defined by the claims. Further, in order to make the public have a better understanding of the present application, some specific details are described in detail in the detailed description of the present application below. Those skilled in the art can fully understand the present application without the description of these details.

[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 positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the basis or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure. In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present disclosure, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0050] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

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

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

[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 of them 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 the adjacent group; one end of the steel wire rope 115 is fixed on the drum 114, and the other end is fixedly connected to the frame 180 after passing through each pulley group and the inter-group fixed pulley 117 in sequence; as the number of turns of the steel wire rope 115 wound on the drum 114 changes, the force application columns 141b in the energy storage module 140 move synchronously, so that the first elastic element 141a and the second elastic element 141c are elastically deformed at the same time and cause changes in elastic potential energy and gravitational potential energy, thereby realizing energy storage and energy 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, and 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 which is 4 to 10 and is an even number, usually 4 or 6. Each energy storage module 140 is respectively equipped with a suspension module 110 and a mechanical transmission module 120, and each energy storage module 140 and the matching suspension module 110 and mechanical transmission module 120 constitute a set of energy storage equipment, which can work on the transmission shaft 130 alone or work on the transmission shaft 130 together with other sets of energy storage equipment.

[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 of the connecting line of the midpoints of the two long sides of the rectangular bottom plate 181, that is, the axis of the transmission shaft 130 is perpendicular to the long side of the bottom plate 181. Considering that the suspension module 110 and the mechanical transmission module 120 need to occupy a certain area, the energy storage sub-modules 141 are densely arranged at a certain distance on both sides of the axis of the transmission shaft 130, and the energy storage sub-modules 141 are divided into each energy storage module 140. The transmission shaft 130, the drum 114 and the mechanical transmission mechanism 120 are all arranged close to the bottom plate 181 of the frame 180, so that the wire rope 115 wound on the drum 114 can maintain a sufficient distance from the first fixed pulley in the pulley block (installed in the upper space in the frame 180), so that the drum 114 can arrange the rope correctly when winding the wire rope 115.

[0059] In a specific embodiment of the present disclosure, the bottom plate 181 of the frame 180 is divided into two by the axis of the transmission shaft 130 , and two sets of energy storage devices are arranged on 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 not only transmit the rotation of the transmission shaft 130 to the energy storage module 140 to increase its elastic potential energy and gravitational potential energy, but also transmit the elastic potential energy and gravitational potential energy of the energy storage module 140 to the torque of 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 124. 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 and 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 connection and disconnection between the suspension module 110 and the transmission shaft 130 are realized by the switch of the second clutch 121, so as to selectively connect the corresponding energy storage module 140 to participate in energy storage or energy release. Specifically, when the energy storage is finished, the energy storage module 140 that has stored energy at full load is first braked, and at the same time, the second clutch 121 in the mechanical transmission module 120 is disengaged from the reel 114, so that the reel 114 is disconnected from the first sprocket 123 in the mechanical transmission module 120 to avoid damage to the mechanical transmission module 120; when the energy storage module 140 is not needed to continue to work on the transmission shaft 130, the first sprocket 123 in the mechanical transmission module 120 is also disengaged from the reel 114 through the second clutch 121 to avoid the energy storage module 140 continuing to work on the transmission shaft 130, so that the speed of the transmission shaft 130 is out of control. The second clutch 121 generally adopts an electromagnetic friction clutch or an electromagnetic tooth clutch, and in this embodiment, an electromagnetic friction clutch is preferably used.The chains 124 in each mechanical transmission module 120 in the energy storage workstation 100 are of the same size, which is conducive to standardized production.

[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 smoother and there is no loss of rotation; when transmitting a larger torque, gear transmission can be used instead of sprocket chain transmission; when transmitting a smaller torque, a synchronous toothed belt transmission can be used instead of a chain transmission to reduce noise and make the transmission smoother.

[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 setting of the one-way overrunning clutch 126 in this embodiment can avoid the influence of the braking of one or more energy storage modules 140 on the continued operation of the transmission shaft 130 by the remaining energy storage modules 140 that are not braked. Specifically, when the energy release of the first energy storage module in the energy storage workstation 100 is about to end, the energy release starts from the second energy storage module. Due to the use of the one-way overrunning clutch 126, the mechanical transmission module matched with the first energy storage module will not be decelerated or the suspension mechanism will be braked, which will affect the effect of the mechanical transmission module matched with the second energy storage module on the transmission shaft 130. In particular, the mechanical transmission module corresponding to the energy storage module that does not participate in the energy release will not cause the efficiency of the energy storage workstation 100 to decrease when releasing energy as the transmission shaft 130 idles.

[0064] In some embodiments, the suspension module 110 further includes a brake 111 and a reel support 113. The reel support 113 is fixed on the bottom plate 181 of the frame 180. The reel 114 is fixedly sleeved on the reel shaft 112. The reel shaft 112 is rotatably connected to the reel support 113 through a bearing. The axial direction of the reel shaft 112 is preferably parallel to the axial direction of the transmission shaft 130. The brake 111 is connected to the reel shaft 112 to control the rotation of the reel 114. When the energy storage module 140 is not required to participate in energy storage or energy release, the brake 111 is used to brake the reel 114 while the second clutch 121 is used to disconnect the transmission shaft 130 from the reel 114, so that the reel 114 stops rotating, thereby maintaining the current state of each force column 141b and elastic element in the matching energy storage module 140 unchanged. The brake 111 may be in the form of an electromagnetic power-off brake, a drum brake, a butterfly brake, a tooth brake, etc., and preferably an electromagnetic power-off brake is used.

[0065] Preferably, the structures of the pulley groups in the suspension module 110 are the same, and each pulley group is respectively composed of 4 fixed pulleys (116a-116d) and 2 movable pulleys (118a, 118b). Assuming that the number of rows of the energy storage submodules 141 in the energy storage module 140 is n, and the number of columns is j (wherein the value of j needs to be considered that when it is too large, the arrangement of the energy storage submodules 141 in one energy storage module 140 will affect the two adjacent energy storage modules 140, and the value of n can be relatively large, but if the value is too large, the steel wire rope will be subjected to obvious friction resistance when it is wound 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 module 140 is 4×n×j, and the number of movable pulleys is 2×n×j. All the pulleys in a single suspension module 110 are connected by a steel wire rope 115. In each pulley group, four fixed pulleys are arranged above the supporting guide frame 141d of a matching energy storage sub-module 141 and fixedly connected to the frame 180, and two movable pulleys are arranged on both sides of the supporting 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 supporting guide frame 141b. The two movable pulleys are rotatably mounted on the connecting shaft 119, and strip holes arranged in the vertical direction are formed on the two side walls of the supporting guide frame 141b, which are used to constrain the movement direction of the force column 141b and the elastic element connected thereto to avoid collision and friction with the supporting guide frame 141b. 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 position of the first fixed pulley 116a and the fourth fixed pulley 116d is lower than the axial position of the second fixed pulley 116b and the third fixed pulley 116c. The 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 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 contact between the wire rope 115 and 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 two adjacent energy storage submodules, Figure 1Taking the first and second energy storage submodules of the first column of energy storage submodules shown as examples, the wire rope 115 is led out of the previous pulley block by the fourth fixed pulley 116d in the previous pulley block and introduced into the next pulley block by the first fixed pulley 116a in the next pulley block. It is preferable to arrange the fourth fixed pulley 116d of the previous pulley block and the first fixed pulley 116a of the next pulley block in the same plane and make them 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 blocks provided in conjunction with the two adjacent energy storage submodules, Figure 1 Taking the energy storage submodules in the first column and second row of the array, and the energy storage submodules in the first column and third row of the array, as examples, the axles of the first fixed pulley 116a and the fourth fixed pulley 116d are parallel and as close as possible, which can also reduce the footprint of the energy storage module 140. The movable pulleys in each pulley group are used to move the corresponding force column 141b up and down in the support guide frame 141d under the traction of the wire rope 115, so as to cause the elastic element connected to the force column 141b to produce elastic deformation. According to the characteristics of the movable pulley, although the total limit force of a single energy storage module 140 (i.e., the sum of the elastic force and gravity generated by all the elastic elements in a single energy storage module 140 when the single energy storage module 140 reaches the full load energy storage or energy release state) is very large, the maximum tension borne by the wire rope 115 is only one-fourth of the limit force of a single energy storage submodule 141, which can greatly reduce 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, but the installation positions are different, and 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 to the fixed pulley 117 between the second columns and is introduced into the pulley group corresponding to the last row of the energy storage submodule in the second column. Then, it goes in the opposite direction to the direction of the steel wire rope 115 in the first column, that is, the pulley group corresponding to the last row of the energy storage submodule in the second column passes through each energy storage submodule in the second column in sequence until it is led out from the pulley group corresponding to the first row of the energy storage submodule in the second column, and is turned from the 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 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 the scenario 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 the scenario where the cross-sectional area of ​​the energy storage submodule 141 is small. By reducing the outer diameter of the support guide frame 141d of the energy storage submodule 141 and increasing the height of the support guide frame 141d of the energy storage submodule 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 140, 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 station 100 is exactly the same. Figure 1 It can be seen that the arrangement of the energy storage submodules 141 is preferably a rectangular array, which is convenient for arranging the pulley block and passing the wire rope 115.

[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, and the elastic element is completely located inside the support guide frame 141d. The internal cross-sectional size of the support guide frame 141d can be set to 1.06 to 1.08 times the cross-sectional size of the elastic element when it is in a free state, so as to avoid the friction between the outer ring of the compressed elastic element and the inner wall of the support guide frame 141d after compression. The internal height of the support guide frame 141d can be set to the total length of the first elastic element 141a and the second elastic element 141c in the free state and the sum of the axial lengths of all internal moving parts such as the force column 141b, and the setting of the wall thickness mainly considers 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 in the support guide frame 141d are both linear elastic elements, which can be a cylindrical helical compression spring and a cylindrical helical tension spring, respectively, or a linear spring group formed by a plurality of springs in series or in parallel (when a linear spring group formed in series is used, the energy storage submodule 141 has a larger stroke when releasing energy), or a linear elastic part formed by elastic rubber or other polymer composite materials. In addition, the elastic element can be arranged only on the upper side or lower side of the force column 141b, which has a lower energy density than the method of arranging elastic elements on both the upper and lower sides of the force column 141b. The force column 141b in the support guide frame 141d can be a cylindrical structure. The cross-sectional dimensions of the first elastic element 141a, the force column 141b and the second elastic element 141c should ensure that they do not contact the side wall of the support guide frame 141d during the entire process of movement in the support guide frame 141d, so as to avoid 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 the upper side thereof 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 force 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 element in the energy storage submodule 141 can also be partially located inside the support guide frame 141d and partially located outside the support guide frame 141d. If the elastic element adopts a linear leaf spring, 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 middle hoop of the two leaf springs is connected to the wire rope 115 respectively. The tensile elastic element has no elastic deformation in the initial state. When the wire rope 115 is tightened in the upper and lower directions respectively, the tensile elastic element produces tensile deformation and is olive-shaped; the force column 141b is at the top of all elastic elements, and a movable pulley is installed on the upper end surface of the force column 141b; the side surfaces of all leaf springs can slide up and down along the inner surface of the support guide frame 141d, and the part of the leaf spring close to the hinge extends to the outside of the support guide frame 141d, and will not interfere with the support guide frame 141d during deformation and sliding. Optionally, the two leaf springs are replaced by two steel beams with I-shaped or square-shaped cross-sections, etc., which can reduce the dead weight while increasing the elastic force.

[0071] In some embodiments, the speed change mechanism 160 in the energy storage workstation 100 includes a fixed speed ratio transmission 161 and a continuously variable transmission 162. The low speed shaft of the fixed speed ratio transmission 161 is connected to one end of the transmission shaft 130 through the first clutch 150, and the high speed shaft of the fixed speed 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 through the elastic coupling 190. The fixed speed ratio transmission 161 is used to change the high speed of the generator motor 170 to the low speed required by the reel 114 in the suspension module 110 when storing energy, and also to change the low speed of the reel 114 in the suspension module 110 to the high speed required by the generator motor 170 when releasing energy; usually, the speed range of the fixed speed ratio transmission is selected to be a value between 1 / 45 and 1 / 120 to ensure that the speed of the generator motor 170 is close to its rated speed, and the difference, especially the speed adjustment required to eliminate the linear change of the force of the energy storage module 140, is completed by the continuously variable transmission 162. The continuously variable transmission 162 is used to ensure that the rotation speed of the transmission shaft 130 undergoes the required linear change, and the torque and rotation speed of the generator motor 170 remain 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 relatively high rotational speed; when the resultant force of the elastic force and gravity of the elastic element gradually approaches its maximum limit, the speed ratio of the stepless speed regulator 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 rotational 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 the energy release starts, the combined force of the elastic force generated by the elastic element in the energy storage module 140 and the gravity decreases linearly. To ensure that the rotation speed of the generator motor 170 is uniform, the speed ratio of the continuously variable transmission 162 is adjusted to release the wire rope 115 in a gradually increasing manner so as to ensure that the moving speed of the force-applying column 141b increases linearly, thereby keeping the torque and rotation speed of the generator motor 170 stable. Optionally, the speed adjustment range of the continuously variable transmission 162 is 1 / 1.45 to 1 / 7.25, so the ratio of the maximum value of the force generated by the energy storage module alone to the minimum value that can make the generator motor 170 just generate electricity does not exceed the difference between the maximum speed ratio and the minimum speed ratio of the continuously variable transmission 162, that is, 7.25-1.45=5.8.The continuously variable transmission 162 is usually in the form of a planetary friction type continuously variable transmission, a metal belt type continuously variable transmission or a hydraulic coupling type transmission. The continuously variable transmission 162 in this embodiment 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 to operate normally, 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 work on the transmission shaft 130. When all energy storage modules have completed the energy release in sequence, the first stage of energy release ends and enters the second stage of energy release.

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

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

[0078] In some embodiments, the control system 300 includes a plurality of sensor units 310, an operation controller 320, a grid-connected control unit 330, a safety protection unit 340, a monitoring unit 350, a communication interface circuit 360, and a user interface 370. Among them, each sensor unit 310 is respectively arranged in a corresponding energy storage workstation 100, and each includes a speed sensor 311, a distance sensor 312, and a force sensor 313. The speed sensor 311 is connected to the main shaft of the generator motor 170 and is used to measure the speed of the generator motor 170. When storing energy, the combined 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 runs within the set speed range; when releasing energy, the combined 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 energy 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, so as to determine whether the energy storage device is stuck or the wire rope is broken, or to reflect whether the change of the 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 transmission shaft 130 and the suspension module 110.The grid-connected control unit 330 is used to connect the electric energy generated by the elastic-gravity hybrid energy storage device to the main power grid. The safety protection unit 340 is used to deal with emergencies. When the parameters exceed the preset working range, such as the motor speed exceeds the preset value or the distance trend reflected by the distance sensor 312 is inconsistent with the tension trend of the wire rope 115 reflected by the force sensor 313, the brake 111 is promptly turned on, the first clutch 150 and the second clutch 121 are disconnected, and the energy storage workstation 100 with problems is shut down. The monitoring unit 350 is used to monitor the working status of the suspension module 110 and the energy storage module 140 in real time, and transmit the data to the operation controller 320, the safety protection unit 340 and the user interface 370. The communication interface circuit 360 is used for data communication during the 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 workstation 100, and data communication and control signals between the operation controller 320 and the sensor unit 310, the brake 111, the second clutch 121, the first clutch 150 and the generator motor 170. The user interface 370 is used to input user instructions, change parameters, and display the operation status, data and faults of the energy storage workstation 100; the human-computer interaction and display functions of the user interface 370 are realized through the computer user display system and the real-time tracing system. As the hub of the control system 300, the operation controller 320 is connected with the sensor unit 310, the grid-connected control unit 330, the safety protection unit 340, the monitoring unit 350, the communication interface circuit 360 and the user interface 370, and plays the role of operation monitoring, including the start and stop of the energy storage workstation 100, the control of other functional modules and the grid-connected monitoring; the operation controller 320 mainly realizes these functions through the 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: firstly, the second clutch 121 and the first clutch 150 are activated, and then the brake 111 on the reel 114 is released, and at the same time, the power cable 171 is connected to start the generator motor 170, and the fixed speed ratio transmission 161 in the speed change mechanism 160 is used 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 to move the force column 141b upward, and at the same time, the first elastic element 141a generates compression elastic deformation, and the second elastic element 141c generates tension 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, and the reel 114 is braked by the brake 111, and the second clutch 121 is disengaged from the transmission connection of the transmission shaft 130, then the energy storage of the first energy storage module ends, and at the same time, the brake 111 in the suspension module 110 matched with the second energy storage module releases the brake on the reel 114 , the second clutch 121 in the mechanical energy storage module 120 is turned on, 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, and the control system 300 first disconnects the power cable 171 of the generator motor 170 to brake the generator motor 170; if there is still surplus electric energy to be stored, the control system 300 then continues to open 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 has no energy storage capacity, the control system 300 disconnects the power cable 171 of the generator motor 170 to brake the generator motor 170, and at the same time brakes all the energy storage modules 140 that are storing energy and disengages the second clutch 121 and the first clutch 150, and the energy storage operation of the energy storage workstation 100 is suspended. If there is a subsequent energy storage requirement, the energy storage workstation 100 whose energy storage operation is suspended continues the energy storage operation until the energy storage workstation 100 achieves full-load energy storage, and finally achieves full-load energy storage of the elastic-gravity hybrid energy storage device;

[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 workstations 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 individually (that is, works on the transmission shaft 130). First, the control system 300 releases the brakes 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 the transmission mechanism 130 and the transmission mechanism 160, 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, and the wire rope 115 wound on the drum 114 is released. The drum 114 is pulled by the wire rope 115 to transfer the torque to the transmission shaft 130 through the second clutch 121, the first sprocket 123, the chain 124, the second sprocket 125 and the one-way overrunning clutch 126 in the mechanical transmission module 120 in sequence. , the transmission shaft 130 transmits the motion to the low-speed shaft of the fixed speed ratio transmission 161 in the speed change mechanism 160 through the first clutch 150, and then transmits it 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 through speed regulation, thereby driving the generator motor 170 to rotate and generate electricity. The combined 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 generator motor 170 to operate normally, then the control The system 300 controls its matching brake 111 to brake the reel 114 and disengage the second clutch 121. At the same time, the second energy storage module 140 starts to release energy individually with a small advance time before the brake 111 of the first energy storage module 140 brakes the reel 114, so as to ensure that the generator motor 170 generates electricity smoothly. Since the component of the mechanical transmission module 120 matching the first energy storage module 140 connecting the transmission shaft 130 is a one-way overrunning clutch 126, the mechanical transmission module 120 matching the second energy storage module 140 will not hinder the rotation of the transmission shaft 130 after the first energy storage module 140 has released energy individually.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, entering the second stage of energy release, the combined force of the elastic force of all the elastic elements in the energy storage workstation and the gravity continues to decrease linearly, and 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, and all the second clutches 121 are disengaged, and the energy storage workstation 100 ends releasing energy; if the elastic force-gravity If there is still a requirement for energy release in the elastic-gravity hybrid energy storage device, the control system 300 opens the remaining energy storage workstations 100 that have not released energy, and continues to release energy according to the above two-stage energy release mode until the entire elastic-gravity hybrid energy storage device achieves full-load energy release; when a single or part of the energy storage workstations 100 are in the process of releasing energy, and unexpectedly no energy release is required, the control system 300 first disconnects the power cable 171 to brake the generator motor 170, and at the same time brakes the energy storage module 140 in the energy storage workstation 100 that is releasing energy, the elastic element stops at the current position, and the energy release operation is suspended. If there is a subsequent requirement for energy release, the energy storage workstation 100 whose energy release operation is suspended continues the energy release operation to achieve full-load energy release of the energy storage workstation 100, and finally the elastic-gravity hybrid energy storage device achieves full-load energy release. ;

[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 make the generator motor 170 in normal power generation should be controlled within the speed regulation range of the speed change mechanism 160 (such as set between 1 and 5.8 in this embodiment), and the torque and speed stability of the generator motor 170 can be conveniently achieved within the speed regulation range of the stepless 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 when the elastic-gravity hybrid energy storage device stores energy can be fully converted into electrical energy, thereby increasing the effective energy release capacity.

[0084] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0085] Although embodiments of the present disclosure have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the present disclosure, the scope of which is defined by the claims and their equivalents.

Claims

1. An elastic-gravity hybrid energy storage workstation for a new energy power generation system, characterized in that: It includes a frame, and a transmission shaft, a first clutch, a speed change mechanism, a generator motor and a plurality of energy storage modules all 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 has a plurality of energy storage sub-modules arranged in an array, with the direction parallel to the transmission shaft as the row and the direction perpendicular to the transmission shaft as the column. The energy storage sub-modules in the same row or column are regarded as a group of energy storage sub-modules. The energy storage submodule comprises a support guide frame and a force-applying column located therein, an elastic element connected to the force-applying column is provided on at least one of the upper side and the lower side of the force-applying 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 submodule 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, each force-applying column in the energy storage module moves synchronously, so that each elastic element is elastically deformed at the same time 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 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.

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

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 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 supporting 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 position of the first fixed pulley and the fourth fixed pulley is larger than the axial position of the second fixed pulley and the third fixed pulley. Low; two movable pulleys are arranged on both sides of a supporting guide frame of a matching energy storage submodule and are connected to the force column through a connecting shaft 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 introduced into and led out of each pulley group by the first fixed pulley and the fourth fixed pulley respectively, and 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: 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°.

8. The energy storage workstation according to claim 1, characterized in that: Each fixed pulley in the pulley block 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 inner 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 opposite through 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 and individually. 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, the suspension module is disconnected from the transmission shaft, and the next energy storage module is connected to work on the transmission shaft. When all energy storage modules have completed the energy release in sequence and individually, the first stage of energy release ends and enters the second stage of energy release. 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 modules are disconnected from the mechanical transmission module, and the energy storage workstation completes energy release.

14. An elastic-gravity hybrid energy storage device for a new energy power generation system, characterized in that: It includes a control system and a plurality of energy storage workstations, each of which is connected to the control system via a control cable; The energy storage workstation adopts the energy storage workstation according to any one of claims 1 to 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 deal with emergencies, and when the parameters exceed the preset working range, the energy storage workstation with the problem is closed in time; The monitoring unit is used to monitor the working status of the energy storage workstation in real time and transmit the data to the operation controller, the safety protection unit and the user interface; The communication interface circuit is used to realize data communication during the operation of the energy storage device; the user interface is used to input user instructions, change parameters, and display the operating status, data and fault conditions of the energy storage workstation; the operation controller is used for operation monitoring of the energy storage workstation, including start and stop control, control of various electronic components and power grid monitoring, wherein the operation controller adjusts the speed change mechanism according to the speed detected by the speed sensor so that the speed of the generator motor runs within the set speed range, the operation controller senses the real-time energy storage or energy release margin of the energy storage module according to the distance detected by the distance measuring sensor to control the corresponding suspension module, and the operation controller also controls the corresponding suspension module according to the tension sensed by the force sensor.

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 simultaneously connects the power cable to start the generator motor. The speed of the drum is controlled to gradually reduce the speed of the winding wire rope by controlling the speed change mechanism. 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. The remaining energy storage modules are started until all the energy storage modules in the opened energy storage workstations 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 achieved full-load energy storage, and when all energy storage workstations are fully loaded with energy storage, the energy storage operation is completed; when a single or part of the energy storage workstations are storing energy and there is an unexpected lack of energy storage capacity, the control system disconnects the power cables to brake the generator motor, and at the same time brakes all the suspension modules that are storing energy and disconnects the transmission routes between all the energy storage modules that are storing energy and the generator motor, and the energy storage operation of the energy storage workstation is suspended. If there is a subsequent energy storage requirement, the energy storage workstation whose energy storage operation is suspended will continue the energy storage operation until the full-load energy storage of the energy storage workstation is achieved, and finally the full-load energy storage of the energy storage device is achieved; During the energy release operation, there are two stages of energy release mode: 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, and releases the wire rope in a gradually increasing manner by controlling the speed change mechanism to make the reel rotate and generate electricity. The combined 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 generator motor to operate normally. Then 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 transmission shaft. The first stage energy release of the first energy storage module ends, and the control system sequentially causes the remaining energy storage modules to perform the first stage potential energy according to the same operation until it is opened. The first stage of energy release of all energy storage modules in the energy storage workstation is completed, and the energy release mode of the second stage is entered; during the second stage of energy release, the control system controls all energy storage modules in the opened energy storage workstation to release energy at the same time. When the force columns in all energy storage modules in the energy storage workstation reach the third set position, it indicates that the energy currently released by the energy storage workstation barely reaches the energy required to drive the generator motor to operate normally, then the control system disconnects the power cable in the energy storage workstation to brake the generator motor, brake all suspension modules, and disconnect the transmission route between each energy storage module and the generator motor, and the energy release of the energy storage workstation is completed; when the energy storage workstation is in the process of energy release, if there is an unexpected situation that energy release is not required, the control system first disconnects the power cable and brakes the generator motor, and at the same time brakes the suspension module that is releasing energy and disconnects the transmission route between all energy storage modules that are releasing energy and the generator motor, and the energy release operation of the energy storage workstation is suspended. If there is a subsequent energy release requirement, the energy storage workstation whose energy release operation is suspended continues the energy release operation until the full load energy release of the energy storage workstation is achieved, and finally the full load energy release of the energy storage device is achieved.

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