Elastic energy storage device for new energy power generation system

Abstract

The invention provides an elastic energy storage device for a new energy power generation system, the elastic energy storage device comprises a control system and a plurality of energy storage working units connected with the control system, each energy storage working unit comprises a rack, and a transmission shaft, a power generation motor and a plurality of energy storage devices which are located in the rack, each energy storage device comprises an elastic module and a mechanical transmission module which are arranged in a matched mode. The elastic modules are connected with the transmission shaft through the matched mechanical transmission modules and evenly distributed around the transmission shaft in a cylindrical spiral shape, a plurality of vortex springs which share a first vortex spring shaft and are different in thickness are arranged in the elastic modules, and the thickness of each vortex spring is increased along with increasing of the distance between the inner end of the vortex spring and the first vortex spring shaft. According to the elastic energy storage device, large-capacity and multi-mode energy storage and energy release can be achieved, it can be guaranteed that electric energy can still be stably generated under the condition that new energy continuously changes, the requirement that the electric energy released by the elastic energy storage device of a main power grid can continuously change can be met, and the energy storage density is large and the integration degree 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 energy storage 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. The power grid must control the access to the two new energy generation capacity within a controllable range to minimize the adverse effects. This not only greatly limits the construction scale and development speed of these two new energy sources, but also leads to coal-fired power plants that are more environmentally damaging and have a higher proportion of carbon emissions as the main power generation. In order to ensure the smooth operation of the power grid, part of the power generation capacity of these two new energy sources is often abandoned in vain, so that the new energy power generation system cannot obtain the expected economic benefits. To this end, measures have been taken to develop and promote new energy storage technologies and supporting new energy storage power stations to reduce energy waste and improve the utilization efficiency 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, the elastic potential energy is used to do work to drive the generator to rotate, thereby converting the elastic potential energy into electric energy. The elastic 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 construct a vortex spring box, and then form an energy storage working unit together with a generator motor, and finally form an energy storage device with multiple energy storage working units and a control system. Due to the limitation of the vortex spring energy storage capacity, the energy storage capacity of each energy storage working unit 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. The latter technical solution has a larger energy storage capacity, but the torque values ​​generated at the beginning and end of energy release are very different. These two technical solutions have obvious shortcomings as new energy power storage solutions: the former method has too short energy release time, and the torque value fluctuates greatly, with the ratio of maximum to minimum value being 3 to 1.5; although the latter method has a longer energy release time, the torque value fluctuates more. If 10 vortex spring boxes are connected in series, the ratio of maximum to minimum value is 30 to 15. These two methods, especially the latter method, place extremely high demands on the control system of the energy storage working unit, because the generator requires the input mechanical speed and torque to be basically stable and no large fluctuations are allowed. In addition, if a vortex spring with a normal rectangular cross-section and equal thickness is used, the energy storage density is low. If the thickness of the vortex spring cross-section is increased, although the energy storage density of the vortex spring is effectively improved, the several turns of steel belt close to the axis of the vortex spring are prone to plastic deformation and fatigue damage, causing the vortex spring to fail. If a vortex spring with a thickness that gradually increases from one end close to the axis of the vortex spring to the end away from the axis of the vortex spring is used, although the energy storage density of the vortex spring can be effectively increased, the vortex spring is abandoned due to the increased difficulty in manufacturing and the sharp increase in production costs due to the small manufacturing batch. In addition, in current energy storage devices, energy storage equipment generally adopts a planar layout, resulting in a large footprint and low energy density. The above reasons have led to the fact that elastic energy storage technology has not been widely used in new energy power generation systems. 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 energy storage device for a new energy power generation system. The present disclosure constructs an elastic energy storage device by using multiple energy storage working units of a vortex spring to achieve large-capacity and multiple modes of energy storage and energy release, with high energy storage density and high integration. By connecting the elastic energy storage device between the existing wind power or photovoltaic power generation system and the power grid, the electric energy generated by the two new energy sources is not directly incorporated into the main power grid, but is stored by the elastic energy storage device; when the main power grid needs electric energy, the elastic energy storage device releases the energy, and the energy release process of the elastic energy storage device is fully controllable, which solves the technical problems caused by the instability of power generation of the two new energy sources, and creates conditions for comprehensively establishing a power supply pattern dominated by new energy and reducing the pollution of the environment by coal-fired power plants.

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

[0007] The present disclosure provides an elastic energy storage device for a new energy power generation system, comprising a control system and a plurality of energy storage working units, each of which is connected to the control system via a control cable;

[0008] The energy storage working unit comprises a frame and a transmission shaft, a load stabilizer, a transmission, a flywheel, a generator motor and several energy storage devices all located therein, each energy storage device respectively comprises a matching elastic module and a mechanical transmission module; the transmission shaft is rotatably connected to the frame, each elastic module is respectively connected to the transmission shaft through a matching mechanical transmission module and is evenly distributed around the transmission shaft in a cylindrical spiral shape, the elastic module comprises a plurality of vortex springs arranged with a common first vortex spring axis and having different thicknesses, and the thickness of each vortex spring increases with the increase of the distance from the inner end of the vortex spring to the first vortex spring axis; one end of the load stabilizer is connected to the transmission shaft through a first elastic coupling, the other end of the load stabilizer is connected to the low-speed shaft of the transmission through a first clutch, the high-speed shaft of the transmission is connected to the generator motor through a second elastic coupling, the flywheel is sleeved on the high-speed shaft of the transmission, the generator motor is connected to the power cable of the new energy power generation system through a power cable, and energy storage or energy release is achieved by rotating and tightening or loosening the vortex spring in the elastic module;

[0009] The control system is used to open or close a corresponding number of the energy storage working units 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 working unit.

[0010] In some embodiments, the frame as a whole is a box-type shell, the inner wall cross-section of the frame is a symmetrical polygonal structure, and the axis of the transmission shaft coincides with the central axis of the polygonal structure.

[0011] In some embodiments, the number of sides of the polygon is n, n is taken as 4 to 8, the angle between each adjacent elastic module in the same energy storage working unit is 360° / n, and the number of the energy storage devices arranged in a single energy storage working unit is n to 12n; the number of vortex springs arranged in each elastic module in the same energy storage working unit is the same, which is 2 to 5.

[0012] In some embodiments, the elastic force module includes the first vortex spring shaft, a static housing, a dynamic housing and a brake, and a plurality of vortex springs, all of which are sleeved on the first vortex spring shaft. The static housing and the dynamic housing are arranged adjacent to each other, the static housing is fixedly connected to the frame, and the dynamic housing is fixedly connected to the first vortex spring shaft. A plurality of chambers are provided radially outward from a position close to the axis center in the static housing and the dynamic housing, and a corresponding vortex spring is installed respectively. Flanges extending into the corresponding chambers of each other are formed on the end surfaces of the static housing and the dynamic housing that are arranged opposite to each other, the outer ends of each vortex spring located in the static housing are fixed to the corresponding inner side walls of the static housing, and the inner ends are fixed to the corresponding flanges of the dynamic housing, the outer ends of each vortex spring located in the dynamic housing are fixed to the corresponding inner side walls of the dynamic housing, and the inner ends are fixed to the corresponding flanges of the static housing; the brake controls the rotation of the first vortex spring shaft and the dynamic housing according to the control instructions of the control system, so that the first vortex spring shaft and the static housing remain in a stationary or rotating state.

[0013] In some embodiments, the mechanical transmission module adopts a synchronous toothed belt transmission method, a sprocket chain transmission method or a gear transmission method to realize the mechanical transmission between the transmission shaft and the elastic module.

[0014] In some embodiments, the elastic energy storage device according to claim 1 is characterized in that the mechanical transmission module includes a second clutch, a clutch bracket, a first synchronous toothed pulley, a synchronous toothed belt, a second synchronous toothed pulley and a one-way overrunning clutch; the second clutch is connected to the first vortex spring shaft, the second clutch and the first synchronous toothed pulley are fixedly connected to the frame through the clutch bracket, the outer cylindrical surface of the one-way overrunning clutch cooperates with the inner hole of the second synchronous toothed pulley, the inner hole of the one-way overrunning clutch is sleeved and connected to the transmission shaft, and the first synchronous toothed pulley and the second synchronous toothed pulley are connected through the synchronous toothed belt; when all the vortex springs in the elastic module are tightened or the elastic module is no longer needed to continue to work on the transmission shaft, the second clutch is controlled by the control system to disengage from the first vortex spring shaft in the elastic module.

[0015] In some embodiments, the load stabilizer includes a second vortex spring shaft, a fourth vortex spring, a vortex spring shaft bracket and a vortex spring housing, the vortex spring shaft bracket is fixedly connected to the frame, the second vortex spring shaft is connected to the transmission shaft through the first elastic coupling, and is rotatably connected to the vortex spring shaft bracket through a bearing, the vortex spring housing is rotatably mounted on the second vortex spring shaft through a bearing, a convex shaft is provided on the vortex spring housing, and the convex shaft is connected to the low-speed shaft of the transmission through the first clutch; the fourth vortex spring is located in the vortex spring housing, and the inner and outer ends of the fourth vortex spring are respectively fixedly connected to the second vortex spring shaft and the side wall of the vortex spring housing.

[0016] In some embodiments, the control system includes an operation controller and a sensor unit, a grid-connected control unit, a safety protection unit, a monitoring unit, a communication interface circuit and a user interface connected thereto; the sensor unit includes a speed sensor for detecting the speed of the generator motor and a code disk sensor for detecting the number of rotations of the first vortex spring shaft. When the speed of the generator motor detected by the speed sensor exceeds a set speed range, the operation controller controls the excitation current and voltage of the generator motor to make the speed of the generator motor run within the set speed range. The operation controller senses the real-time energy storage and release margin of the elastic module according to the number of rotations of the first vortex spring shaft detected by the code disk sensor, and realizes the rotation of the generator motor by increasing the corresponding energy storage capacity and number of elastic modules. speed control; the grid-connected control unit is used to connect the electric energy generated by the elastic energy storage device to the main power grid; the safety protection unit is used to deal with emergencies. When the parameters exceed the preset working range, the problematic energy storage working unit or even the entire elastic energy storage device is shut down in time; the monitoring unit is used to monitor the working status of the energy storage working unit in real time and transmit the data to the operation control unit, the safety protection unit and the user interface; the communication interface circuit is used to realize data communication during the working process of the elastic 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 working unit; the operation controller is used for operation monitoring of the energy storage working unit, including start-stop control, control of various electronic devices and power grid monitoring.

[0017] In some embodiments, the operation process of the elastic energy storage device includes:

[0018] During energy storage operation: the control system opens the energy storage devices in the corresponding number of energy storage working units according to the energy storage capacity requirements of the new energy power plant. In the energy storage devices of the opened energy storage working units, the control system first starts the first elastic module: after the elastic module is connected to the mechanical transmission module connected to it, the brake on the first vortex spring shaft is released, and at the same time, the generator motor is started through the power cable, the torque is increased by using the transmission, and then the transmission shaft is rotated through the load stabilizer. The transmission shaft transmits power to the elastic module through the mechanical transmission module, so that the vortex springs in the elastic module are tightened. When the control system senses through the code disk sensor that the vortex springs in the elastic module have reached the number of turns tightened at full load, the first vortex spring shaft is braked and the first clutch is disengaged. Then the energy storage of the first elastic module ends, and the second elastic module is connected to the mechanical energy storage module matched with it. The transmission shaft is connected to the mechanical transmission module through the transmission. The module tightens all the vortex springs in the second elastic module until all the elastic modules of the energy storage working unit have completed energy storage, and the control system first brakes the generator motor through the power cable; if there is still surplus electric energy to be stored, the control system continues to open the energy storage devices of the remaining energy storage working units until all the energy storage working units of the entire elastic energy storage device are fully loaded with energy, and the energy storage operation is completed; when a single or part of the energy storage working units are storing energy and there is an unexpected situation that there is no energy storage capacity, the control system brakes the generator motor through the power cable, and at the same time brakes all the elastic energy storage modules that are storing energy and disengages the elastic modules from the transmission shaft, and the transmission shaft from the load stabilizer, and the energy storage operation of the energy storage working unit is suspended. If there is a subsequent energy storage requirement, the energy storage working unit whose energy storage operation is suspended continues the energy storage operation until the full-load energy storage of the energy storage working unit is achieved, and finally the full-load energy storage of the elastic energy storage device is achieved;

[0019] During the energy release operation: the control system opens a corresponding number of energy storage working units according to the required energy release capacity. In the opened energy storage working units, the control system first connects the power cable to start the generator motor, then releases the brake of the first elastic module, and connects the elastic module with the matching mechanical transmission module. The elastic module transmits the torque to the transmission shaft through the mechanical transmission module by relaxing all the vortex springs therein. The transmission shaft transmits the stable torque to the low-speed shaft of the transmission through the load stabilizer. After the high-speed shaft of the transmission further stabilizes the speed through the flywheel, it drives the generator motor to rotate and generate electricity. When the energy release of the first elastic module is completed, the elastic module is disengaged from the matching mechanical transmission module, and the second elastic module releases energy at the same time; each elastic module is released energy in succession until all the elastic modules in the energy storage working units are released. After the energy release of each block is completed, the control system disconnects the power cable in the energy storage working unit and brakes the generator motor, and the energy release of the energy storage working unit is completed; if the elastic energy storage device still has energy release requirements, the control system opens the remaining energy storage working units that have not released energy until the entire elastic energy storage device relaxes the vortex springs of all elastic modules in all energy storage working units to achieve full-load energy release; when the energy storage working unit is in the process of releasing energy and 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 elastic module in the energy storage working unit that is releasing energy, so that the vortex springs therein are in the current position, and the energy release operation is suspended. If there is a subsequent energy release requirement, the energy storage working unit whose energy release operation is suspended continues the energy release operation until the full-load energy release of the energy storage working unit is achieved, and finally the full-load energy release of the elastic energy storage device is achieved.

[0020] In some embodiments, each energy storage working unit is a prefabricated component, which is manufactured and assembled in a factory and then transported to a new energy power generation station; the outer contour dimensions of the rack are consistent with the outer dimensions of a standard container.

[0021] The present disclosure has the following features and beneficial effects:

[0022] The elastic energy storage device disclosed in the present invention is used for energy storage in a new energy power plant, and can realize large-capacity and multiple ways of energy storage and energy release, and the grid-connected electric energy can remain stable. Specifically, the energy storage capacity of the elastic 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. During the period when the output of the new energy power plant decreases or there is no output at all due to natural reasons, the elastic energy storage device starts multiple energy storage working units to participate in power generation; in the elastic energy storage device, it can be realized that a single or multiple energy storage working units participate in energy storage or energy release at the same time, it can also be realized that all energy storage working units participate in energy storage or energy release at the same time, it can also be realized that a single energy storage working unit participates in energy storage or energy release in succession, and it can also be realized that some energy storage working units participate in energy storage or energy release in succession as a whole, which can not only ensure that the wind power plant can still generate electric energy stably under the condition of light wind and constantly changing wind speed or the photovoltaic power plant under low-intensity light or constantly changing light intensity, but also meet the main power grid's requirements for the elastic energy storage device to release electric energy with certain flexibility. More importantly, the new energy power plant does not directly supply electricity to the main power grid, but generates electricity and is connected to the grid through this elastic energy storage device. The electric energy generated by the elastic energy storage device remains stable, thereby eliminating the adverse effects of new energy power generation on the main power grid and creating conditions for increasing the proportion of the above two types of new energy power generation in the regional power grid.

[0023] In addition, the present invention adopts an elastic module with multiple vortex springs of different thicknesses according to the distance from the axis center, which not only solves the problem that several turns of steel belts of thicker vortex springs close to the axis center will produce plastic deformation and fatigue damage, but also greatly increases the energy storage density of the elastic module and improves the economy of the energy storage working unit. In addition, the elastic modules are distributed in a cylindrical spiral shape around the transmission shaft in the energy storage working unit, which further improves the energy storage density and integration of the equipment, creating conditions for the large-scale application of the elastic energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the layout of an elastic energy storage device for a new energy power generation system provided by an embodiment of the present disclosure;

[0025] Figure 2 yes Figure 1 A schematic top view and cross-sectional view of an energy storage working unit in the elastic energy storage device shown;

[0026] Figure 3 It is the AA section view in 2;

[0027] Figure 4 yes Figure 2 A schematic diagram of the structure of the elastic force module in the energy storage working unit shown;

[0028] Figure 5 yes Figure 4An exploded schematic diagram of a partial structure of the elastic module shown;

[0029] Figure 6 yes Figure 2 The structural schematic diagram of the load stabilizer in the energy storage working unit shown;

[0030] Figure 7 yes Figure 1 A schematic diagram of the structure of a control system in the elastic energy storage device shown;

[0031] Reference numerals:

[0032] 100-energy storage working unit, 110-elastic unit, 111-first vortex spring shaft, 112-brake, 113-static housing, 113a-base, 113b-static housing body, 113c-static housing end cover, 113d-first flange, 113e-first chamber, 113f-third chamber, 114-second bearing, 115-first vortex spring, 116-second vortex spring, 117-third vortex spring, 118-dynamic housing, 118a-dynamic housing body, 118b-dynamic housing end cover, 118c-second chamber, 120-mechanical transmission module, 121-second clutch, 122- Clutch bracket, 123-first synchronous toothed pulley, 124-synchronous toothed belt, 125-second synchronous toothed pulley, 126-one-way overrunning clutch, 130-transmission shaft, 131-first bearing, 141-first elastic coupling, 142-second elastic coupling, 150-load stabilizer, 151-second vortex spring shaft, 152-vortex spring shaft bracket, 153-fourth vortex spring, 154-vortex spring housing, 154a-convex shaft, 160-first clutch, 170-transmission, 180-flywheel, 190-generator motor, 191-power cable, 1100-frame;

[0033] 200-control cable;

[0034] 300 - control system, 310 - sensing unit, 311 - speed sensor, 312 - encoder 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

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] See also Figures 1 to 7, an elastic energy storage device for a new energy power generation system provided by an embodiment of the present disclosure includes: a plurality of energy storage working units 100 and a control system 300, each energy storage working unit 100 is connected to the control system 300 through a control cable 200;

[0041] The energy storage working unit 100 includes a frame 1100 and a transmission shaft 130, a load stabilizer 150, a transmission 170, a flywheel 180, a generator motor 190, and a plurality of elastic modules 110 and mechanical transmission modules 120 all located therein; the transmission shaft 130 is rotatably connected to the frame 1100, each elastic module 110 is respectively connected to the transmission shaft 1100 through a matching mechanical transmission module 120 and is evenly distributed in a cylindrical spiral around the transmission shaft 130, and a plurality of vortex springs having a common first vortex spring shaft 111 and different thicknesses are arranged in the elastic module 110, and the thickness of each vortex spring increases as the inner end of the vortex spring is extended to the first vortex spring shaft 111. The thickness of the vortex spring increases with the increase of the distance, that is, the farther the inner end is from the first vortex spring shaft 111, the greater the thickness of the vortex spring; one end of the load stabilizer 150 is connected to the transmission shaft 130 through the first elastic coupling 141, and the other end of the load stabilizer 150 is connected to the low-speed shaft of the transmission 170 through the first clutch 160, and the high-speed shaft of the transmission 170 is connected to the generator motor 190 through the second elastic coupling 142, and the flywheel 180 is sleeved on the high-speed shaft of the transmission 170. The generator motor 190 is connected to the power cable of the new energy power generation system through the power cable 191, and energy storage or energy release is achieved by rotating and tightening or loosening the vortex spring in the elastic module 110;

[0042] The control system 300 is used to open or close a corresponding number of energy storage working units 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 working unit 100.

[0043] Furthermore, the control system 300 controls the working mode of each energy storage working unit 100 according to the energy storage and release instructions of the new energy power generation system: when the new energy power generation site has less power generation, the new energy power generation system instruction control system 300 starts a single or a few energy storage working units 100 to participate in energy storage; when the power generation site is close to full load, the new energy power generation system instruction control system 300 starts all energy storage working units 100 to participate in energy storage at the same time; when the power generation site gradually increases, the new energy power generation system instruction control system 300 starts a single or multiple energy storage working units 100 to join the energy storage one after another.

[0044] In some embodiments, the number of energy storage working units 100 included in the elastic energy storage device can 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 demand, the elastic energy storage device can realize stable power supply to the power grid in an artificially controllable manner.

[0045] In some embodiments, see Figures 1 to 6 In a single energy storage working unit 100, several groups of elastic modules 110 and mechanical transmission modules 120 are included. Each group of elastic modules 110 and mechanical transmission modules 120 constitutes an energy storage device, which can work on the transmission shaft 130 alone or together with other multiple energy storage devices. The control system 300 can adjust the speed of the transmission shaft 130 in real time by making the elastic modules 110 with different energy storage capacities and quantity combinations work on the transmission shaft 130, thereby achieving the requirement that the energy storage working unit 100 can generate electricity steadily within a certain power range. The structures of the energy storage working units 100 are the same, and one of the energy storage working units 100 is now taken as an example for explanation.

[0046] See also Figure 3 The frame 1100 is a box-type shell as a whole. In order to facilitate the arrangement of as many elastic modules 110 as possible in the box-type shell to improve the integration of the energy storage working unit 100, thereby increasing the energy storage density of the energy storage working unit 100, the inner wall cross section of the frame 1100 is designed to be a symmetrical polygonal structure, and the axis of the transmission shaft 130 coincides with the central axis of the polygonal structure. The number of sides of the polygon is n, and n is preferably 4 to 8. The angle between each adjacent elastic module 110 in a single energy storage working unit 100 is 360° / n, and the number of energy storage devices set in a single energy storage working unit 100 is preferably n to 12n. The two ends of the transmission shaft 130 are rotatably connected to the inner wall of the frame 1100 through the first bearing 131. In this embodiment, the inner wall cross section of the frame 1100 is a symmetrical hexagonal structure, and the angle between each adjacent elastic module 110 is 60°.

[0047] Each elastic force module 110 in the energy storage unit 100 has the same structure, and each includes a first vortex spring shaft 111, a static housing 113, a dynamic housing 118, a brake 112, and a plurality of vortex springs, each of which is sleeved on the first vortex spring shaft 111. The static housing 113 and the dynamic housing 118 are arranged adjacent to each other, the static housing 113 is fixedly connected to the frame 1100, and the dynamic housing 118 is fixedly connected to the first vortex spring shaft 111. A plurality of chambers are radially arranged outward from a position close to the axis center in the static housing 113 and the dynamic housing 118, and a corresponding vortex spring is installed respectively. Flanges extending into the corresponding chambers of the other party are respectively formed on the end faces of the static housing 113 and the dynamic housing 118 that are arranged opposite to each other, and the outer ends of each vortex spring in the static housing 113 are respectively connected to the static housing 113. The corresponding inner walls of the movable housing 118 are fixed, and the inner ends are respectively fixed to the corresponding flanges of the movable housing 118. The outer ends of the vortex springs located in the movable housing 118 are respectively fixed to the corresponding inner walls of the movable housing 118, and the inner ends are respectively fixed to the corresponding flanges of the static housing 113, that is, the spiral directions of the vortex springs in the static housing 113 and the movable housing 118 are opposite; at the same time, the thickness of each vortex spring located in the static housing 113 and the movable housing 118 increases with the increase of the distance from the inner end of the vortex spring to the first vortex spring axis 111. According to the description in Volume 3, 11-132 of "Mechanical Design Manual" published by Chemical Industry Press: The maximum torque of the rectangular cross-section vortex spring is in a cubic relationship with the thickness. This structure effectively increases the energy storage density of the elastic module without causing the vortex spring to fail. In order to make the rotation speed of the transmission shaft 130 in the energy storage unit 100 uniform, the number m of vortex springs contained in each elastic module 110 in a single energy storage unit 100 is set to be the same, and m is preferably 2 to 5; when m=2, 1 vortex spring is respectively arranged in the static housing 113 and the dynamic housing 118; when m=3, 2 vortex springs are arranged in the static housing 113, and 1 vortex spring is arranged in the dynamic housing 118; when m=4, 2 vortex springs are respectively arranged in the static housing 113 and the dynamic housing 118; when m=5, 3 vortex springs are arranged in the static housing 113, and 2 vortex springs are arranged in the dynamic housing 118.

[0048] See also Figures 2 to 5In one embodiment of the present disclosure, each elastic force module 110 in a single energy storage unit 100 is provided with three vortex springs, and the three vortex springs are numbered as a first vortex spring 115, a second vortex spring 116 and a third vortex spring 117 in order from small to large according to the distance from the inner end of the vortex spring to the first vortex spring shaft 111. The first vortex spring 115 and the third vortex spring 117 are both located in the static housing 113, and the second vortex spring 116 is located in the dynamic housing 118. The first vortex spring 115 and the third vortex spring 117 are respectively connected to the first vortex spring shaft 111. The second vortex spring 116 receives or outputs power through its inner end and keeps the outer end still, that is, the spiral direction of the second vortex spring 116 is opposite to that of the first vortex spring 115 and the third vortex spring 117. Among the three vortex springs, the thickness of the first vortex spring 115 is the smallest, the thickness of the third vortex spring 117 is the largest, the thickness of the second vortex spring 116 is between the thickness of the first vortex spring 115 and the third vortex spring 117, and the thickness of each vortex spring itself remains unchanged in the radial direction. Among them, the first vortex spring shaft 111 is parallel to the transmission shaft 130, and the first vortex spring shaft 111 passes through the static housing 113 and is rotatably connected to the static housing 113 through the second bearing 114. The static housing 113 is arranged adjacent to the dynamic housing 118. The static housing 113 includes a base 113a, a static housing body 113b and a static housing end cover 113c. A first chamber 113e for accommodating a first vortex spring 115 and a third chamber 113f for accommodating a third vortex spring 117 are formed in the static housing body 113b along its radial direction; the base 113a is fixedly supported on the inner wall of the frame 1100 and remains relatively stationary with the frame 1100; the inner end of the first vortex spring 115 is fixed to the first vortex spring shaft 111, and the outer end is fixed to the inner side of the first chamber 113e, the static housing end cover 113c is fixed to the outer side wall of the third chamber 113f, and a through hole is opened in the middle of the static housing end cover 113c, and a third chamber 117 extending into the dynamic housing 118 is formed on the side wall between the first chamber 113e and the third chamber 113f. A flange 113d; the moving housing 118 is fixedly sleeved on the first vortex spring shaft 111 and rotates synchronously with the first vortex spring shaft 111. The moving housing 118 includes a moving housing body 118a and a moving housing end cover 118b which are fixedly connected, and the moving housing end cover 118b is arranged facing the static housing 113. A second flange is formed on the moving housing end cover 118b and extends into the third chamber 113f through a central through hole of the static housing end cover 113c. A second chamber 118c for accommodating the second vortex spring 116 is formed in the moving housing body 118a. The inner end of the second vortex spring 116 is fixed to the first flange 113d, and the outer end is fixed to the side wall of the second chamber 118a away from the first vortex spring shaft 111. The inner end of the third vortex spring 117 is fixed to the second flange, and the outer end is fixed to the side wall of the third chamber 113c away from the first vortex spring shaft 111.The brake 112 is sleeved on the first vortex spring shaft 111. The brake 112 controls the rotation of the first vortex spring shaft 111 and the moving housing 118 according to the control command of the control system 300, so that the first vortex spring shaft 111 and the static housing 113 remain stationary or rotating. When storing energy, the first vortex spring shaft 111 drives the moving housing 118 to rotate, and also drives the inner ends of the first vortex spring 115 and the third vortex spring 117 to be tightened. At the same time, the moving housing 118 drives the outer end of the second vortex spring 116 to be tightened. As the inner end of the vortex spring is farther from the axis of the first vortex spring shaft 111, the thickness of its steel belt can be greater, and it will not cause plastic deformation or fatigue damage to the several turns of steel belt close to the axis when tightened, and it also greatly improves the energy storage density of the elastic module 110. The brake 112 in the elastic module 110 can control the first vortex spring shaft 111 and the moving housing. The rotation of the body 118 is controlled. When the vortex spring is in the fully tightened number of turns, the rotation of the first vortex spring shaft 111 and the moving housing 118 is braked in time to avoid damage to the vortex spring. When the vortex spring is relaxed and doing work, the brake 112 can brake the first vortex spring shaft 111 and the moving housing 118 in time according to the control command of the control system 300, so that the elastic potential energy stored in the elastic module 110 is avoided from unnecessary waste. For this purpose, the brake 112 can be in the form of an electromagnetic power-off brake, a drum brake, a butterfly brake, a tooth brake, etc. In this embodiment, an electromagnetic power-off brake is preferably used.

[0049] It should be noted that the number of elastic modules 110 contained in different energy storage working units 100 may be different, and the number of vortex springs contained in the elastic modules 110 may also be different. When there are fewer elastic modules 110 set in the energy storage working unit 100, the volume of each elastic module 110 can be increased to increase the power during power generation, but at this time the energy storage working unit 100 will soon release the energy, which is suitable for the power grid's requirements for flexible energy release of the entire elastic energy storage device. For example, for a photovoltaic power plant during the period from 12 noon to 15 pm in the summer, the power generation per unit time is dozens of times that during the period from 8 am to 9 am or from 5 pm to 6 pm. At this time, it is necessary to invest some energy storage working units 100 with short energy storage time and high power density for energy storage in a short period of time. Therefore, in the elastic energy storage device disclosed in the present invention, both energy storage working units with fewer elastic modules and energy storage working units with more elastic modules should be set to meet different energy storage and energy release requirements.

[0050] See also Figure 2Each mechanical transmission module 120 in the energy storage unit 100 includes a second clutch 121, a clutch bracket 122, a first synchronous toothed pulley 123, a synchronous toothed belt 124, a second synchronous toothed pulley 125 and a one-way overrunning clutch 126; the second clutch 121 is connected to the first vortex spring shaft 111, the second clutch 121 and the first synchronous toothed pulley 123 are fixedly connected to the inner wall of the frame 1100 through the clutch bracket 122, the outer cylindrical surface of the one-way overrunning clutch 126 is matched with the inner hole of the second synchronous toothed pulley 125, the inner hole of the one-way overrunning clutch 126 is sleeved and connected to the transmission shaft 130, and the first synchronous toothed pulley 123 and the second synchronous toothed pulley 125 are connected through the synchronous toothed belt 124. The mechanical transmission module 120 matched with each elastic module 110 can not only transmit the rotation of the transmission shaft 130 to the elastic module 110, so as to tighten the first vortex spring 115, the second vortex spring 116 and the third vortex spring 117 in the elastic module 110, but also transmit the torque on the first vortex spring shaft 111 to the transmission shaft 130 when the first vortex spring 115, the second vortex spring 116 and the third vortex spring 117 are relaxed. Specifically, when energy storage is required, the transmission shaft 130 rotates the second synchronous toothed pulley 125 through the one-way overrunning clutch 126, the second synchronous toothed pulley 125 rotates the first synchronous toothed pulley 123 through the synchronous toothed belt 124, and the first synchronous toothed pulley 123 rotates the first vortex spring shaft 111 in the elastic module 110 through the second clutch 121, so as to tighten the first, second and third vortex springs; when the elastic module releases energy, the transmission route of the mechanical transmission module 120 is exactly opposite to that when storing energy. When the control system 300 brakes the fully tightened elastic module 110, the second clutch 121 in the mechanical transmission module 120 will be disengaged from the first vortex spring shaft 111 to avoid damage to the mechanical transmission module 120; when the control system 300 does not need the elastic module 110 to continue to work on the transmission shaft 130, the control system 300 will also disengage the second clutch 121 in the mechanical transmission module 120 from the first vortex spring shaft 111 to avoid the elastic module 110 continuing to work on the transmission shaft 130, causing the speed of the transmission shaft 130 to lose 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 synchronous toothed belts 124 in each mechanical transmission module 120 in the same energy storage unit 100 are of the same size, which is conducive to standardized production.

[0051] It can be understood that the mechanical transmission module 120 of this embodiment uses a first synchronous toothed pulley 123, a synchronous toothed belt 124 and a second synchronous toothed pulley 125 for transmission between the elastic module 110 and the transmission shaft 130, that is, a synchronous toothed belt transmission method is adopted. This method has smooth transmission and does not cause loss of rotation; when the transmitted torque is large, a sprocket chain transmission method or a gear transmission method can be used instead of the synchronous toothed belt transmission method.

[0052] See also Figure 2 , Figure 6 The load stabilizer 150 in the energy storage unit 100 eliminates the influence of the periodic change of elastic force when the elastic module 110 releases energy successively on the operation of the transmission 170, especially the generator motor 190, by storing and releasing elastic potential energy. The load stabilizer 150 of this embodiment includes a second vortex spring shaft 151, a fourth vortex spring 153, a vortex spring shaft bracket 152 and a vortex spring housing 154. The vortex spring shaft bracket 152 is fixedly connected to the inner wall of the frame 1100. The second vortex spring shaft 151 is connected to the transmission shaft 130 through the first elastic coupling 141, and is rotatably connected to the vortex spring shaft bracket 152 through a bearing. The vortex spring housing 154 is rotatably sleeved on the second vortex spring shaft 151 through a bearing. The vortex spring housing 154 is provided with a convex shaft 154a, and the convex shaft 154a is connected to the low-speed shaft of the transmission 170 through the first clutch 160. The fourth vortex spring 153 is located in the vortex spring housing 154, the inner end of the fourth vortex spring 153 is fixedly connected to the second vortex spring shaft 151, and the outer end is fixedly connected to the end wall of the vortex spring housing 154 away from the second vortex spring shaft 151; the fourth vortex spring 153 buffers the load acting on the transmission 170 when the elastic module 110 releases energy by storing or releasing energy, so that the fluctuation amplitude of the torque value transmitted to the transmission 170 when the elastic module 110 releases energy becomes smaller. When the speed of the generator motor 190 is lower than the set threshold, the control system 300 starts the elastic module 110 with the corresponding energy storage capacity and quantity to increase the torque transmitted to the transmission 170 to increase the speed of the generator motor 190; when the speed of the generator motor 190 is higher than the set threshold, the control system 300 reduces the elastic module 110 with the corresponding energy storage capacity and quantity to reduce the torque transmitted to the transmission 170 to reduce the speed of the generator motor 190, so that the speed of the generator motor 190 is always kept within the specified range to achieve smooth operation.

[0053] The flywheel 180 in the energy storage unit 100 is fixed on the high-speed shaft of the transmission 170 . Through the inertia of the flywheel 180 , the instantaneous influence of the torque fluctuation of the transmission 170 on the operation of the generator motor 190 is eliminated, thereby playing a role in stabilizing the rotation speed of the generator motor 190 .

[0054] Furthermore, in order to shorten the construction period of the elastic energy storage device of the disclosed embodiment, each energy storage working unit 100 is a prefabricated part, which can be manufactured and assembled in a factory and then transported to a new energy power generation station. In order to facilitate transportation requirements, the outer contour dimensions of the frame 1100 are consistent with the outer dimensions of a standard container, so that the frame 1100 does not exceed the width standard of automobile freight during road transportation.

[0055] In some embodiments, see Figures 1 to 7The 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 working unit 100, and each includes a speed sensor 311 and a code disk sensor 312; the speed sensor 311 is connected to the main shaft of the generator motor 190, and is used to measure the speed of the generator motor 190. When storing energy, when the speed of the generator motor 190 detected by the speed sensor 311 exceeds the set speed range, the operation controller 320 controls the excitation current and voltage of the generator motor 190, so that the speed of the generator motor 190 runs within the set speed range; when releasing energy, when the speed of the generator motor 190 detected by the speed sensor 311 exceeds the set speed range, the operation controller 320 starts the springs with different energy storage capacities and quantities. The force module 110 jointly adjusts the speed of the generator motor 190 so that the speed of the generator motor 190 is within a specified range; the encoder sensor 312 is used to measure the number of turns tightened by the first vortex spring shaft 111. Since the torque of the vortex spring in the elastic module 110 can be regarded as a linear change when being tightened or loosened, the real-time energy storage and release margin of the energy storage working unit 100 to which the elastic module 110 belongs can be sensed by detecting the number of turns tightened by the first vortex spring shaft 111; the grid-connected control unit 330 is used to connect the electric energy generated by the elastic 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, the energy storage working unit 100 with problems is shut down in time, or even the entire elastic energy storage device. The monitoring unit 350 is used to monitor the working status of the elastic module 110 and the energy storage working unit 100 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 energy storage device of this embodiment, including but not limited to data communication between the control system 300 and the energy storage working unit 100, and data communication and control signals between the operation controller 320 and the sensor unit 310, the brake 112, the first clutch 160, the second clutch 121 and the generator motor 190. The user interface 370 is used to input user instructions, change parameters, and display the operating status, data and faults of the energy storage working unit 100; the human-computer interaction and display functions of the user interface 370 are realized through the computer user display system and the real-time tracing system. As the center of the control system 300, the operation controller 320 is connected with the sensor unit 310, the grid-connected control unit 330, the safety protection unit 340, the monitoring unit 350, the communication interface circuit 360 and the user interface 370, and plays the role of operation monitoring, including the start and stop of the energy storage working unit 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 working unit 100 through the control cable 200, and is also connected to the brake 112, the first clutch 160, the second clutch 121 and the generator motor 190 to realize the control of the working mode of the energy storage working unit 100 and the monitoring of the working status.

[0056] In some embodiments, the operation process of the elastic energy storage device includes:

[0057] During energy storage operation: the control system 300 opens the energy storage devices of the corresponding number of energy storage working units 100 according to the energy storage capacity requirements of the new energy power plant. Among the energy storage devices of the opened energy storage working units 100, the control system 300 first starts the first elastic module 110: first connects the second clutch 121 and the first clutch 160, then releases the brake 112 on the first vortex spring shaft 111, and at the same time connects the power cable 191 to start the generator motor 190, uses the transmission 170 to increase the torque, and then rotates the transmission shaft 130 through the load stabilizer 150, and the transmission shaft 130 transmits the torque through the mechanical transmission module 120. To the elastic module 110: the transmission shaft 130 rotates the second synchronous toothed pulley 125 through the one-way overrunning clutch 126 thereon, the second synchronous toothed pulley 125 rotates the first synchronous toothed pulley 123 through the synchronous toothed belt 124, the first synchronous toothed pulley 123 rotates the first vortex spring shaft 111 through the clutch 121, the first vortex spring shaft 111 tightens the first vortex spring 115 and tightens the second vortex spring 116 and the third vortex spring 117 through the moving housing 118, when the control system 300 senses the number of rotations of the three vortex springs being tightened at full load through the code disc sensor 312, the first vortex spring shaft 111 is braked through the brake 112, At the same time, the clutch 121 is disengaged, and the energy storage of the first elastic module is completed. At the same time, the clutch 121 in the mechanical energy storage module matched with the second elastic module is connected, and the transmission shaft 130 tightens the vortex spring in the second elastic module 110 through the mechanical transmission module 120, and so on until all the elastic modules 110 in the energy storage working unit 100 have completed energy storage. The control system 300 first disconnects the power cable 191 and brakes the generator motor 190; if there is still surplus electric energy to be stored, the control system 300 continues to open the energy storage devices of the remaining energy storage working units 100 until all the energy storage working units of the entire elastic energy storage device are fully charged. When a single or part of the energy storage working unit 100 is storing energy and there is no energy storage capacity unexpectedly, the control system 300 disconnects the power cable 191 and brakes the generator motor 190, and at the same time brakes all the elastic energy storage modules 110 that are storing energy and disengages the first clutch 160 and the second clutch 121, and the energy storage operation of the energy storage working unit 100 is suspended. If there is a subsequent energy storage requirement, the energy storage working unit 100 whose energy storage operation is suspended continues the energy storage operation, and the energy storage working unit 100 is fully loaded. Energy storage is realized, and finally the full load energy storage of the elastic energy storage device is realized;

[0058] During the energy release operation: the control system 300 opens a corresponding number of energy storage working units 100 according to the required energy release capacity. In the opened energy storage working units 100, the control system 300 first connects the power cable 191 to start the generator motor 190, then releases the brake of the first elastic module 110, and simultaneously connects the second clutch 121 in the matching mechanical transmission module 120. The elastic module 110 releases the first vortex spring 115, the second vortex spring 116 and the third vortex spring 117 at the same time, and sequentially passes the torque through the second clutch 121, the first synchronous toothed belt pulley 123 and the synchronous toothed belt 121 in the mechanical transmission module 120. 4. The second synchronous toothed pulley 125 and the one-way overrunning clutch 126 transmit to the transmission shaft 130. The transmission shaft 130 transmits a relatively stable torque to the low-speed shaft of the transmission 170 through the load stabilizer 150. The high-speed shaft of the transmission 170 further stabilizes the rotation speed through the flywheel 180, driving the generator motor 190 to rotate and generate electricity. When the first elastic module 110 finishes releasing energy, its matching second clutch 121 is disengaged, and the second elastic module 110 releases energy at the same time. Since the component of the mechanical transmission module 120 matching the first elastic module 110 connecting the transmission shaft 130 is the one-way overrunning clutch 126, the energy release is finished. The mechanical transmission module 120 matched with the elastic module 110 behind will not hinder the rotation of the transmission shaft 130; until all the elastic modules 110 in the energy storage working unit 100 have released their energy, the control system 300 disconnects the power cable 191 in the energy storage working unit 100 and brakes the generator motor 190, and the energy storage working unit 100 ends releasing its energy; if the elastic energy storage device still has energy release requirements, the control system 300 opens the remaining energy storage working units 100 that have not released their energy until the entire elastic energy storage device has released the first vortex spring 115, the second vortex spring 116 and the third vortex spring 117 of the energy storage modules 110 in all the energy storage working units 100. 17 relaxes to achieve full-load energy release; when a single or part of the energy storage working unit 100 is in the process of releasing energy and unexpectedly there is a situation where energy release is not needed, the control system 300 first disconnects the power cable 191, brakes the generator motor 190, and at the same time brakes the elastic module 110 in the energy storage working unit 100 that is releasing energy, so that the first vortex spring 115, the second vortex spring 116 and the third vortex spring 117 are in the current position, and the energy release operation is suspended. If there is a subsequent energy release requirement, the energy storage working unit 100 whose energy release operation is suspended continues the energy release operation to achieve full-load energy release of the energy storage working unit, and finally achieve full-load energy release of the elastic energy storage device.

[0059] 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.

[0060] 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 energy storage device for a new energy power generation system, characterized in that: It includes a control system and a plurality of energy storage working units, each of which is connected to the control system via a control cable; The energy storage working unit comprises a frame and a transmission shaft, a load stabilizer, a transmission, a flywheel, a generator motor and several energy storage devices all located therein, each energy storage device respectively comprises a matching elastic module and a mechanical transmission module; the transmission shaft is rotatably connected to the frame, each elastic module is respectively connected to the transmission shaft through a matching mechanical transmission module and is evenly distributed around the transmission shaft in a cylindrical spiral shape, the elastic module comprises a plurality of vortex springs arranged with a common first vortex spring axis and having different thicknesses, and the thickness of each vortex spring increases with the increase of the distance from the inner end of the vortex spring to the first vortex spring axis; one end of the load stabilizer is connected to the transmission shaft through a first elastic coupling, the other end of the load stabilizer is connected to the low-speed shaft of the transmission through a first clutch, the high-speed shaft of the transmission is connected to the generator motor through a second elastic coupling, the flywheel is sleeved on the high-speed shaft of the transmission, the generator motor is connected to the power cable of the new energy power generation system through a power cable, and energy storage or energy release is achieved by rotating and tightening or loosening the vortex spring in the elastic module; The control system is used to open or close a corresponding number of the energy storage working units 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 working unit.

2. The elastic energy storage device according to claim 1, characterized in that: The frame as a whole is a box-type shell, the inner wall cross section of the frame is a symmetrical polygonal structure, and the axis of the transmission shaft coincides with the central axis of the polygonal structure.

3. The elastic energy storage device according to claim 2, characterized in that: Assume that the number of sides of the polygon is n, and n is taken as 4 to 8. The angle between each adjacent elastic module in the same energy storage working unit is 360° / n. The number of the energy storage devices arranged in a single energy storage working unit is n to 12n. The number of vortex springs arranged in each elastic module in the same energy storage working unit is the same, and is taken as 2 to 5.

4. The elastic energy storage device according to claim 1, characterized in that: The elastic force module includes the first vortex spring shaft, a static housing, a dynamic housing and a brake, and a plurality of vortex springs, all of which are sleeved on the first vortex spring shaft. The static housing and the dynamic housing are arranged adjacent to each other, the static housing is fixedly connected to the frame, the dynamic housing is fixedly connected to the first vortex spring shaft, a plurality of chambers are radially outwardly provided in the static housing and the dynamic housing from a position close to the axis center, and a corresponding vortex spring is installed respectively, flanges extending into the corresponding chambers of the other party are formed on the end surfaces of the static housing and the dynamic housing that are arranged opposite to each other, the outer ends of each vortex spring located in the static housing are respectively fixed to the corresponding inner side walls of the static housing, and the inner ends are respectively fixed to the corresponding flanges of the dynamic housing, the outer ends of each vortex spring located in the dynamic housing are respectively fixed to the corresponding inner side walls of the dynamic housing, and the inner ends are respectively fixed to the corresponding flanges of the static housing; the brake controls the rotation of the first vortex spring shaft and the dynamic housing according to the control instructions of the control system, so that the first vortex spring shaft and the static housing remain in a stationary or rotating state.

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

6. The elastic energy storage device according to claim 1, characterized in that: The elastic energy storage device according to claim 1 is characterized in that the mechanical transmission module includes a second clutch, a clutch bracket, a first synchronous toothed pulley, a synchronous toothed belt, a second synchronous toothed pulley and a one-way overrunning clutch; the second clutch is connected to the first vortex spring shaft, the second clutch and the first synchronous toothed pulley are fixedly connected to the frame through the clutch bracket, the outer cylindrical surface of the one-way overrunning clutch cooperates with the inner hole of the second synchronous toothed pulley, the inner hole of the one-way overrunning clutch is sleeved and connected to the transmission shaft, and the first synchronous toothed pulley and the second synchronous toothed pulley are connected by the synchronous toothed belt; when all the vortex springs in the elastic module are tightened or the elastic module is no longer needed to continue to work on the transmission shaft, the second clutch is controlled by the control system to disengage from the first vortex spring shaft in the elastic module.

7. The elastic energy storage device according to claim 1, characterized in that: The load stabilizer includes a second vortex spring shaft, a fourth vortex spring, a vortex spring shaft bracket and a vortex spring housing, the vortex spring shaft bracket is fixedly connected to the frame, the second vortex spring shaft is connected to the transmission shaft through the first elastic coupling, and is rotatably connected to the vortex spring shaft bracket through a bearing, the vortex spring housing is rotatably mounted on the second vortex spring shaft through a bearing, a convex shaft is provided on the vortex spring housing, and the convex shaft is connected to the low-speed shaft of the transmission through the first clutch; the fourth vortex spring is located in the vortex spring housing, and the inner and outer ends of the fourth vortex spring are respectively fixedly connected to the second vortex spring shaft and the side wall of the vortex spring housing.

8. The elastic energy storage device according to claim 1, characterized in that: The control system includes an operation controller and a sensing unit, a grid-connected control unit, a safety protection unit, a monitoring unit, a communication interface circuit and a user interface connected thereto; the sensing unit includes a speed sensor for detecting the speed of the generator motor and a code disc sensor for detecting the number of rotations of the first vortex spring shaft. When the speed of the generator motor detected by the speed sensor exceeds the set speed range, the operation controller controls the excitation current and voltage of the generator motor so that the speed of the generator motor runs within the set speed range. The operation controller senses the real-time energy storage and energy release margin of the elastic module according to the number of rotations of the first vortex spring shaft detected by the code disc sensor, and controls the speed of the generator motor by increasing the corresponding energy storage capacity and number of elastic modules; the grid-connected control unit is used to connect the electric energy generated by the elastic energy storage device to the main power grid; the safety protection unit is used to deal with emergencies. When the parameters exceed the preset working range, the energy storage working unit with problems, or even the entire elastic energy storage device, is promptly closed; the monitoring unit is used to monitor the working status of the energy storage working unit in real time and transmit the data to the operation control unit, the safety protection unit and the user interface; The communication interface circuit is used to realize data communication during the working process of the elastic 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 working unit; the operation controller is used for operation monitoring of the energy storage working unit, including start and stop control, control of various electronic devices and power grid monitoring.

9. The elastic energy storage device according to claim 8, characterized in that: The operation process of the elastic energy storage device includes: During energy storage operation: the control system opens the energy storage devices in the corresponding number of energy storage working units according to the energy storage capacity requirements of the new energy power plant. In the energy storage devices of the opened energy storage working units, the control system first starts the first elastic module: after the elastic module is connected to the mechanical transmission module connected to it, the brake on the first vortex spring shaft is released, and at the same time, the generator motor is started through the power cable, the torque is increased by using the transmission, and then the transmission shaft is rotated through the load stabilizer. The transmission shaft transmits power to the elastic module through the mechanical transmission module, so that the vortex springs in the elastic module are tightened. When the control system senses through the code disk sensor that the vortex springs in the elastic module have reached the number of turns tightened at full load, the first vortex spring shaft is braked and the first clutch is disengaged. Then the energy storage of the first elastic module ends, and the second elastic module is connected to the mechanical energy storage module matched with it. The transmission shaft is connected to the mechanical transmission module through the transmission. The module tightens all the vortex springs in the second elastic module until all the elastic modules of the energy storage working unit have completed energy storage, and the control system first brakes the generator motor through the power cable; if there is still surplus electric energy to be stored, the control system continues to open the energy storage devices of the remaining energy storage working units until all the energy storage working units of the entire elastic energy storage device are fully loaded with energy, and the energy storage operation is completed; when a single or part of the energy storage working units are storing energy and there is an unexpected situation that there is no energy storage capacity, the control system brakes the generator motor through the power cable, and at the same time brakes all the elastic energy storage modules that are storing energy and disengages the elastic modules from the transmission shaft, and the transmission shaft from the load stabilizer, and the energy storage operation of the energy storage working unit is suspended. If there is a subsequent energy storage requirement, the energy storage working unit whose energy storage operation is suspended continues the energy storage operation until the full-load energy storage of the energy storage working unit is achieved, and finally the full-load energy storage of the elastic energy storage device is achieved; During the energy release operation: the control system opens a corresponding number of energy storage working units according to the required energy release capacity. In the opened energy storage working units, the control system first connects the power cable to start the generator motor, then releases the brake of the first elastic module, and connects the elastic module with the matching mechanical transmission module. The elastic module transmits the torque to the transmission shaft through the mechanical transmission module by relaxing all the vortex springs therein. The transmission shaft transmits the stable torque to the low-speed shaft of the transmission through the load stabilizer. After the high-speed shaft of the transmission further stabilizes the speed through the flywheel, it drives the generator motor to rotate and generate electricity. When the energy release of the first elastic module is completed, the elastic module is disengaged from the matching mechanical transmission module, and the second elastic module releases energy at the same time; each elastic module is released energy in succession until all the elastic modules in the energy storage working units are released. After the energy release of each block is completed, the control system disconnects the power cable in the energy storage working unit and brakes the generator motor, and the energy release of the energy storage working unit is completed; if the elastic energy storage device still has energy release requirements, the control system opens the remaining energy storage working units that have not released energy until the entire elastic energy storage device relaxes the vortex springs of all elastic modules in all energy storage working units to achieve full-load energy release; when the energy storage working unit is in the process of releasing energy and 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 elastic module in the energy storage working unit that is releasing energy, so that the vortex springs therein are in the current position, and the energy release operation is suspended. If there is a subsequent energy release requirement, the energy storage working unit whose energy release operation is suspended continues the energy release operation until the full-load energy release of the energy storage working unit is achieved, and finally the full-load energy release of the elastic energy storage device is achieved.

10. The elastic energy storage device according to any one of claims 1 to 9, characterized in that: Each energy storage working unit is a prefabricated part, which is manufactured and assembled in a factory and then transported to a new energy power generation station; the outer contour dimensions of the rack are consistent with the outer dimensions of a standard container.

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