Wind power generation energy storage system, wind turbine and wind power generation energy storage control method

Abstract

The present invention relates to the technical field of wind turbines, and particularly relates to a wind power energy storage system, a wind turbine, and a wind power energy storage control method. The wind power energy storage system includes: a first transmission shaft; a main shaft connected to the first transmission shaft through a first clutch; a first energy storage part in transmission cooperation with the first transmission shaft; and a second energy storage part in transmission cooperation with the first transmission shaft. In the present invention, during normal power generation, the main shaft drives the first transmission shaft to rotate, and the first energy storage part and the second energy storage part are in transmission cooperation with the first transmission shaft and store energy. When the external wind force is small or too large, the main shaft is disconnected from the first transmission shaft, and the first energy storage part and the second energy storage part can adjust the potential energy sequence and drive the first transmission shaft to rotate, with higher energy utilization rate, enabling the generator to maintain normal operation, and the power generation process to be continuous and enabling non-stop operation, making the wind turbine operate more stably, effectively solving the problems of complex energy storage structure and poor reliability of wind power generation equipment in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbines, and particularly relates to a wind power energy storage system, a wind turbine, and a wind power energy storage control method. Background Art

[0002] A wind power generation device is a power device that converts wind energy into mechanical energy, and then converts the mechanical energy into electrical energy and outputs alternating current. The wind power generation device is mainly installed in windy areas such as coastal areas and plateaus, and its power output end is connected to the power grid. In order to reduce the impact of the wind power generation device on the operation of the power grid, it is very important for the wind power generation device to supply power stably and continuously.

[0003] Currently, existing wind power generation devices generally store standby electrical energy through storage batteries, and discharge the storage batteries when there is no wind to ensure that the wind power generation device can continuously supply power. Because large-scale wind power generation devices have a large power generation capacity, the storage battery capacity set is huge, which in turn results in high costs and difficult maintenance of the wind power generation device. At the same time, there will still be a situation where the power is insufficient and power generation cannot be carried out when there is no wind. Therefore, existing wind power generation devices also have problems of complex energy storage structures and poor reliability. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the complex energy storage structure and poor reliability of the wind power generation device in the prior art, so as to provide a wind power energy storage system, a wind turbine, and a wind power energy storage control method.

[0005] To solve the above problems, the present invention provides a wind power generation energy storage system, including: a first transmission shaft adapted to drive the generator of the wind turbine to generate electricity; a main shaft adapted to be driven by the blades of the wind turbine to rotate and transmit power, the main shaft is connected to the first transmission shaft through a first clutch, the first clutch has an engaged state and a disengaged state, when the first clutch is in the engaged state, power can be transmitted between the main shaft and the first transmission shaft, when the first clutch is in the disengaged state, power cannot be transmitted between the main shaft and the first transmission shaft; a first energy storage unit in transmission cooperation with the first transmission shaft, the first energy storage unit has an energy storage state and an energy release state; a second energy storage unit in transmission cooperation with the first transmission shaft, the second energy storage unit has an energy storage state and an energy release state; wherein, the maximum stored energy of the first energy storage unit is greater than the maximum stored energy of the second energy storage unit; when the wind speed of the external environment is within the first preset wind speed range and / or the rotational speed of the main shaft is within the first preset rotational speed range, the first clutch is in the engaged state and the second energy storage unit is in the energy storage state; when the wind speed of the external environment is within the second preset wind speed range and / or the rotational speed of the main shaft is within the second preset rotational speed range, the first clutch is in the engaged state and the first energy storage unit is in the energy storage state; the maximum value of the first preset wind speed range is less than or equal to the minimum value of the second preset wind speed range, and the maximum value of the first preset rotational speed range is less than or equal to the minimum value of the second preset rotational speed range; when the wind speed of the external environment is outside the first preset wind speed range and the second preset wind speed range and / or the rotational speed of the main shaft is outside the first preset rotational speed range and the second preset rotational speed range, when the first clutch is in the disengaged state, the first energy storage unit and / or the second energy storage unit is in the energy release state.

[0006] Optionally, the wind power generation energy storage system further includes: a controller electrically connected to the first clutch, and the controller controls the first clutch to switch between its engaged state and disengaged state.

[0007] Optionally, the wind power generation energy storage system further includes a wind speed sensor adapted to detect the wind speed of the external environment, the controller is electrically connected to the wind speed sensor, and the controller controls the first clutch to switch between its engaged state and disengaged state according to the wind speed detected by the wind speed sensor; and / or, the wind power generation energy storage system further includes a speed sensor adapted to detect the rotational speed of the main shaft, the controller is electrically connected to the speed sensor, and the controller controls the first clutch to switch between its engaged state and disengaged state according to the rotational speed detected by the speed sensor.

[0008] Optionally, when the wind speed is less than the minimum value of the first preset wind speed range and / or the rotational speed is less than the minimum value of the first preset rotational speed range, the energy release priority of the second energy storage unit is higher than that of the first energy storage unit; when the wind speed is greater than the maximum value of the second preset wind speed range and / or the rotational speed is greater than the maximum value of the second preset rotational speed range, the energy release priority of the first energy storage unit is higher than that of the second energy storage unit.

[0009] Optionally, the wind power energy storage system further includes: a second transmission shaft connected to the first transmission shaft through a first transmission mechanism, and the transmission ratio between the first transmission shaft and the second transmission shaft is less than or equal to 1; a second clutch respectively connected to the first energy storage unit and the second transmission shaft, and the second clutch has a combined state and a disengaged state. When the second clutch is in the combined state, power can be transmitted between the first transmission shaft and the first energy storage unit. When the second clutch is in the disengaged state, power cannot be transmitted between the first transmission shaft and the first energy storage unit.

[0010] Optionally, the wind power energy storage system further includes: a third transmission shaft connected to the first transmission shaft through a second transmission mechanism, and the transmission ratio between the first transmission shaft and the third transmission shaft is greater than 1; a third clutch connected between the third transmission shaft and the second energy storage unit, and the third clutch has a combined state and a disengaged state. When the third clutch is in the combined state, power can be transmitted between the first transmission shaft and the second energy storage unit. When the third clutch is in the disengaged state, power cannot be transmitted between the first transmission shaft and the second energy storage unit.

[0011] The present invention also provides a wind turbine, which includes: a generator, blades, and the above-mentioned wind power energy storage system. The generator is driven by the first transmission shaft of the wind power energy storage system to generate electricity, and the blades drive the main shaft of the wind power energy storage system to rotate.

[0012] The present invention also provides a wind power energy storage control method, which includes the following steps: obtaining the wind speed of the external environment and / or the rotational speed of the main shaft; controlling the state of the first clutch, the states of the first energy storage unit and the second energy storage unit according to the wind speed and / or the rotational speed.

[0013] Optionally, the step of controlling the state of the first clutch, the states of the first energy storage unit and the second energy storage unit according to the wind speed or the rotational speed includes: determining whether the wind speed is within a first preset wind speed range and / or whether the rotational speed is within a first preset rotational speed range; when the wind speed is within the first preset wind speed range and / or the rotational speed is within the first preset rotational speed range, controlling the first clutch to engage and the second energy storage unit to store energy; when the wind speed is outside the first preset wind speed range and / or the rotational speed is outside the first preset rotational speed range, determining whether the wind speed is within a second preset wind speed range and / or whether the rotational speed is within a second preset rotational speed range; when the wind speed is within the second preset wind speed range and / or the rotational speed is within the second preset rotational speed range, the first clutch is in the engaged state and the first energy storage unit is in the energy storage state; when the wind speed is outside the first preset wind speed range and the second preset wind speed range and / or the rotational speed is outside the first preset rotational speed range and the second preset rotational speed range, controlling the first clutch to disengage, and the first energy storage unit and / or the second energy storage unit to release energy.

[0014] Optionally, when the wind speed is outside the first preset wind speed range and / or the second preset wind speed range and / or the rotational speed is outside the first preset rotational speed range and the second preset rotational speed range, the step of controlling the first clutch to be in an open state and the first energy storage unit and / or the second energy storage unit to be in an energy release state includes: when the wind speed is less than the minimum value of the first preset wind speed range or the rotational speed is less than the minimum value of the first preset rotational speed range, the energy release priority of the second energy storage unit is higher than that of the first energy storage unit; when the wind speed is greater than the maximum value of the second preset wind speed range or the rotational speed is greater than the maximum value of the second preset rotational speed range, the energy release priority of the first energy storage unit is higher than that of the second energy storage unit.

[0015] The present invention has the following advantages:

[0016] 1. In at least one embodiment, a first clutch is provided between the first transmission shaft and the main shaft. During normal power generation, the main shaft drives the first transmission shaft to rotate. The first energy storage unit and the second energy storage unit are in transmission cooperation with the first transmission shaft and store energy. When the external wind force is small or too large, the first clutch is in an open state, the main shaft is disconnected from the first transmission shaft, and the first energy storage unit and the second energy storage unit can adjust the potential energy sequence according to the change of the external wind speed and drive the first transmission shaft to rotate. While the energy utilization rate is higher, the first transmission shaft can rotate continuously. The generator can still generate electricity and operate without wind, and the power generation process is continuous and can achieve non-stop operation, making the wind turbine operate more stably and without loss, effectively solving the problems of complex energy storage structure and poor reliability of existing wind power generation equipment, and effectively reducing the impact of wind power generation equipment on the power grid operation when there is no wind or the wind force is small.

[0017] 2. In at least one embodiment, the first preset value is the minimum wind speed at which the generator can operate normally, and the second preset value is the maximum wind speed at which the generator can operate normally. The controller can control the state of the first clutch according to the wind speed measured by the wind speed sensor, so that the wind turbine can maintain a normal working state, enable the wind turbine to continuously generate electricity in a windless state, and at the same time enable the wind turbine to avoid being damaged due to excessive rotational speed.

[0018] 3. In at least one embodiment, the first transmission mechanism is a first gear transmission mechanism. The gear meshing transmission structure is more reliable. During the long-term transmission process between the first transmission shaft and the second transmission shaft, the gear meshing is not easily damaged and has a long service life. Brief Description of the Drawings

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 The structural schematic diagram of the wind power energy storage system according to the embodiment of the present invention is shown.

[0021] Explanation of the reference numerals:

[0022] 10. Generator; 11. First transmission shaft; 111. First transmission gear; 112. Second transmission gear; 12. Blade; 13. Main shaft; 14. Second transmission shaft; 141. First mating gear; 15. Third transmission shaft; 151. Second mating gear; 20. First clutch; 31. First spring energy storage unit; 32. First locking structure; 40. Second clutch; 51. Second spring energy storage unit; 52. Second locking structure; 60. Third clutch; 71. Wind speed sensor; 72. Controller; 73. Speed sensor; 80. Housing. Specific embodiments

[0023] The following will clearly and completely describe the technical solutions of the present invention with reference to the drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0024] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device 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 of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" 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, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0026] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0027] As Figure 1 shown, the wind power generation energy storage system of this embodiment includes: a first transmission shaft 11, a main shaft 13, a first energy storage unit, and a second energy storage unit. The first transmission shaft 11 is adapted to drive the generator 10 of the wind turbine to generate electricity; the main shaft 13 is adapted to be driven by the blade 12 of the wind turbine to rotate and transmit power. The main shaft 13 is connected to the first transmission shaft 11 through a first clutch 20. The first clutch 20 has an engaged state and a disengaged state. When the first clutch 20 is in the engaged state, power can be transmitted between the main shaft 13 and the first transmission shaft 11. When the first clutch 20 is in the disengaged state, power cannot be transmitted between the main shaft 13 and the first transmission shaft 11. The first energy storage unit is in transmission cooperation with the first transmission shaft 11, and the first energy storage unit has an energy storage state and an energy release state. The second energy storage unit is in transmission cooperation with the first transmission shaft 11, and the second energy storage unit has an energy storage state and an energy release state. Among them, the maximum stored energy of the first energy storage unit is greater than the maximum stored energy of the second energy storage unit. When the wind speed of the external environment is within the first preset wind speed range and / or the rotation speed of the main shaft 13 is within the first preset rotation speed range, the first clutch 20 is in the engaged state, and the second energy storage unit is in the energy storage state. When the wind speed of the external environment is within the second preset wind speed range and / or the rotation speed of the main shaft 13 is within the second preset rotation speed range, the first clutch 20 is in the engaged state, and the first energy storage unit is in the energy storage state. The maximum value of the first preset wind speed range is less than or equal to the minimum value of the second preset wind speed range, and the maximum value of the first preset rotation speed range is less than or equal to the minimum value of the second preset rotation speed range. When the wind speed of the external environment is outside the first preset wind speed range and the second preset wind speed range and / or the rotation speed of the main shaft 13 is outside the first preset rotation speed range and the second preset rotation speed range, when the first clutch 20 is in the disengaged state, the first energy storage unit and / or the second energy storage unit is in the energy release state.

[0028] Applying the wind power generation energy storage system of this embodiment, a first clutch 20 is provided between the first transmission shaft 11 and the main shaft 13. During normal power generation, the main shaft 13 drives the first transmission shaft 11 to rotate. The first energy storage unit and the second energy storage unit are in transmission cooperation with the first transmission shaft 11 and store energy at different wind speeds and / or rotational speeds of the main shaft 13, achieving energy storage in different scenarios. When the external wind force is small or too large, the first clutch 20 is in the disengaged state, the main shaft 13 is disconnected from the first transmission shaft 11, and at least one of the first energy storage unit and the second energy storage unit drives the first transmission shaft 11 to rotate. The generator 10 can still generate electricity and operate even in the absence of wind, and the power generation process is continuous and can achieve non-stop operation, making the wind turbine operate more stably and without loss, effectively solving the problems of complex energy storage structure and poor reliability of wind power generation equipment in the prior art, and effectively reducing the impact of wind power generation equipment on the power grid operation when there is no wind or the wind force is small.

[0029] Specifically, the wind turbine further includes a gearbox. The first transmission shaft 11 is the input shaft or output shaft of the gearbox. When the first transmission shaft 11 is the output shaft of the gearbox, the first transmission shaft 11 is connected to the input shaft of the generator 10 through a coupling, and the input shaft of the gearbox is connected to the main shaft 13 through the first clutch 20. When the first transmission shaft 11 is the input shaft of the gearbox, the output shaft of the gearbox is connected to the input shaft of the generator 10 through a coupling. A hub is provided on the main shaft 13, and the blades 12 of the wind turbine are fixedly connected to the hub, thereby driving the main shaft 13 to rotate.

[0030] In at least one embodiment, the wind power generation energy storage system further includes a controller 72. The controller 72 is electrically connected to the first clutch 20, and the controller 72 controls the first clutch 20 to switch between its engaged state and disengaged state, with sensitive control and rapid response.

[0031] In at least one embodiment, the wind power generation energy storage system further includes a wind speed sensor 71. The wind speed sensor 71 is adapted to detect the wind speed of the external environment. The controller 72 is electrically connected to the wind speed sensor 71, and the controller 72 controls the first clutch 20 to switch between its engaged state and disengaged state according to the wind speed detected by the wind speed sensor 71. The wind power generation energy storage system further includes a speed sensor 73. The speed sensor 73 is adapted to detect the rotational speed of the main shaft 13. The controller 72 is electrically connected to the speed sensor 73, and the controller 72 controls the first clutch 20 to switch between its engaged state and disengaged state according to the rotational speed detected by the speed sensor 73. At least one of the external wind speed and the rotational speed of the main shaft 13 can be used as a judgment basis. The controller 72 automatically controls the state of the first clutch 20 according to the signals fed back by the wind speed sensor 71 and / or the speed sensor 73, making the control process more intelligent.

[0032] In at least one embodiment, when the wind speed is less than the minimum value of the first preset wind speed range and / or the rotational speed is less than the minimum value of the first preset rotational speed range, the energy release priority of the second energy storage unit is higher than that of the first energy storage unit; when the wind speed is greater than the maximum value of the second preset wind speed range and / or the rotational speed is greater than the maximum value of the second preset rotational speed range, the energy release priority of the first energy storage unit is higher than that of the second energy storage unit, enabling the wind turbine to maintain a normal operating state, enabling the wind turbine to continuously generate electricity in a windless state, and at the same time enabling the wind turbine to avoid being damaged due to excessive rotational speed. Among them, the minimum value of the preset wind speed range is the lowest wind speed at which the generator 10 can operate normally, the maximum value of the preset wind speed range is the highest wind speed at which the generator 10 can operate normally, the minimum value of the preset rotational speed range is the lowest rotational speed at which the generator 10 can operate normally, and the maximum value of the preset rotational speed range is the maximum rotational speed that the generator 10 can withstand. By adjusting the potential energy order according to the change of the external wind speed, the energy utilization rate is higher. For example, the minimum value of the first preset wind speed range is 3 m / s, and the maximum value of the first preset wind speed range is 10 m / s, that is, the first preset wind speed range is 3 m / s to 10 m / s, the minimum value of the second preset wind speed range is 10 m / s, and the maximum value of the second preset wind speed range is 20 m / s, that is, the second preset wind speed range is 10 m / s to 20 m / s. It can be understood that the first preset wind speed range and the second preset wind speed range need to be determined according to the power of the wind turbine and are not limited thereto.

[0033] It should be noted that the greater the wind speed, the higher the rotational speed of the main shaft 13, and the smaller the wind speed, the lower the rotational speed of the main shaft 13. There is a one-to-one correspondence between the wind speed and the rotational speed of the main shaft 13, and this correspondence can adopt the existing technology and will not be elaborated in detail here.

[0034] Specifically, the elastic potential energy stored in the first energy storage unit is relatively large, and the elastic potential energy stored in the second energy storage unit is relatively small. When the wind speed is less than the minimum value of the first preset wind speed range and / or the rotational speed is less than the minimum value of the first preset rotational speed range, the rotational speed of the first transmission shaft 11 is relatively low at this time. At this time, the second energy storage unit releases energy first and then the first energy storage unit releases energy, so that the rotational speed of the first transmission shaft 11 gradually changes from slow to fast, reducing the rotational speed fluctuation of the first transmission shaft 11. At the same time, if the external wind speed condition has recovered to the normal power generation wind speed of the generator 10 when the second energy storage unit releases energy, the first clutch 20 becomes engaged at this time, and the main shaft 13 and the first transmission shaft 11 can still be engaged with a relatively low rotational speed difference, reducing the impact on the first clutch 20. When the wind speed is greater than the maximum value of the second preset wind speed range and / or the rotational speed is greater than the maximum value of the second preset rotational speed range, the rotational speed of the first transmission shaft 11 is relatively high at this time. At this time, the first energy storage unit releases energy first and then the second energy storage unit releases energy, so that the rotational speed of the first transmission shaft 11 changes from fast to slow, reducing the rotational speed fluctuation of the main shaft 13. At the same time, if the external wind speed condition has recovered to the normal power generation wind speed of the generator 10 when the first energy storage unit releases energy, the first clutch 20 becomes engaged at this time, and the main shaft 13 and the first transmission shaft 11 can be engaged with a relatively low rotational speed difference, reducing the impact on the first clutch 20. It can be understood that as an alternative implementation manner, when the wind speed is less than the minimum value of the first preset wind speed range and / or the rotational speed is less than the minimum value of the first preset rotational speed range, the first energy storage unit and the second energy storage unit can also release energy simultaneously, or the energy release priority of the first energy storage unit is higher than that of the second energy storage unit; when the wind speed is greater than the maximum value of the second preset wind speed range and / or the rotational speed is greater than the maximum value of the second preset rotational speed range, the first energy storage unit and the second energy storage unit can also release energy simultaneously, or the energy release priority of the second energy storage unit is higher than that of the first energy storage unit.

[0035] It should be noted that after or during the release of the energy stored in the second energy storage unit, the external wind speed condition has recovered to the normal power generation wind speed of the generator 10, and at this time, it is not necessary to use the first energy storage unit to release energy; after or during the release of the energy stored in the first energy storage unit, the external wind speed condition has recovered to the normal power generation wind speed of the generator 10, and at this time, it is not necessary to use the second energy storage unit to release energy.

[0036] In at least one embodiment, the wind power energy storage system further includes a second transmission shaft 14 and a second clutch 40. The second transmission shaft 14 is connected to the first transmission shaft 11 through a first transmission mechanism, and the transmission ratio between the first transmission shaft 11 and the second transmission shaft 14 is less than or equal to 1. The second clutch 40 is respectively connected to the first energy storage unit and the second transmission shaft 14. The second clutch 40 has an engaged state and a disengaged state. When the second clutch 40 is in the engaged state, power can be transmitted between the first transmission shaft 11 and the first energy storage unit. When the second clutch 40 is in the disengaged state, power cannot be transmitted between the first transmission shaft 11 and the first energy storage unit. The controller 72 controls the state of the second clutch 40 according to the signals fed back by the wind speed sensor 71 and / or the speed sensor 73, making the control process more intelligent and precise.

[0037] In at least one embodiment, the second clutch 40 is connected between the first energy storage unit and the second transmission shaft 14, with a simple and reliable structure.

[0038] In at least one embodiment, the wind power energy storage system further includes a third transmission shaft 15 and a third clutch 60. The third transmission shaft 15 is connected to the first transmission shaft 11 through a second transmission mechanism, and the transmission ratio between the first transmission shaft 11 and the third transmission shaft 15 is greater than 1. The third clutch 60 is connected between the third transmission shaft 15 and the second energy storage unit. The third clutch 60 has an engaged state and a disengaged state. When the third clutch 60 is in the engaged state, power can be transmitted between the first transmission shaft 11 and the second energy storage unit. When the third clutch 60 is in the disengaged state, power cannot be transmitted between the first transmission shaft 11 and the second energy storage unit. The controller 72 controls the state of the third clutch 60 according to the signals fed back by the wind speed sensor 71 and / or the speed sensor 73, making the control process more intelligent and precise.

[0039] In at least one embodiment, the third clutch 60 is connected between the third transmission shaft 15 and the second energy storage unit, with a simple and reliable structure.

[0040] Specifically, the second clutch 40 is electrically connected to the controller 72. The second transmission shaft 14 is disposed on one side of the first transmission shaft 11. The third clutch 60 is electrically connected to the controller 72. The third transmission shaft 15 is disposed on one side of the first transmission shaft 11. The third transmission shaft 15 may be on the same side of the cylinder as the second transmission shaft 14 or on the opposite side of the second transmission shaft 14. The elastic energy released by the second energy storage part is relatively small, and it mainly stores energy when the rotational speed of the first transmission shaft 11 is relatively low. The transmission ratio between the first transmission shaft 11 and the third transmission shaft 15 is greater than 1. When the rotational speed of the first transmission shaft 11 is relatively low, the torque can be increased, so that the second energy storage part can still store energy. At the same time, when the second energy storage part outputs energy, it can also keep the first transmission shaft 11 at a certain rotational speed. The elastic energy released by the first energy storage part is relatively large, and it mainly stores energy when the rotational speed of the first transmission shaft 11 is relatively high. The transmission ratio between the first transmission shaft 11 and the third transmission shaft 15 is less than or equal to 1. When the rotational speed of the first transmission shaft 11 is relatively high, it can store energy quickly. At the same time, when the first clutch 20 is disengaged when the external wind speed exceeds the predetermined value, it can still drive the first transmission shaft 11 to rotate at a high speed, preventing the rotational speed of the first transmission shaft 11 from suddenly decreasing and reducing the power generation efficiency of the generator 10, which affects the operation of the power grid.

[0041] In at least one embodiment, the first energy storage part includes a first energy storage shaft and a plurality of first spring energy storage units 31. The plurality of first spring energy storage units 31 are arranged on the first energy storage shaft. The first energy storage shaft is connected to the second transmission shaft 14 through the second clutch 40. The first energy storage shaft rotates driven by the second transmission shaft 14, and the plurality of first spring energy storage units 31 store energy at this time.

[0042] Specifically, the number of the first spring energy storage units 31 is not limited and can be changed according to the environment in which the wind turbine is applied. Each first spring energy storage unit 31 includes a spring and a pull rod. The material of the spring is metal. The spring is sleeved on the first energy storage shaft and is driven by the first energy storage shaft to rotate for energy storage. The outer end structure of the spring is tightened through the pull rod. At this time, the inner circumference of the spring is separated from the first energy storage shaft and is fixed independently. When the potential energy of the spring is saturated, the inner circumference of the spring is connected to the first energy storage shaft and rotates in the same direction as the first energy storage shaft. At this time, the pull rod also returns to the initial state and waits for the next energy storage. The first spring energy storage unit 31 can adopt the structure in the prior art and will not be elaborated in detail here.

[0043] In at least one embodiment, the first energy storage part further includes a first locking structure 32. The first locking structure 32 is arranged on the first energy storage shaft and is electrically connected to the controller 72. The first locking structure 32 has a locked state in which the first energy storage shaft cannot rotate and an unlocked state in which the first energy storage shaft can rotate. When the energy stored in the first energy storage part is full or the first energy storage part is not required to supply energy, the first locking structure 32 is in the locked state at this time. When the first energy storage part needs to release energy, the first locking structure 32 is in the unlocked state at this time.

[0044] Specifically, the first locking structure 32 is sleeved on the first energy storage shaft. The first locking structure 32 includes a swingable friction plate and a driving member. The friction plate is connected to the housing through an elastic member such as a spring. The driving member can drive the friction plate to swing. In the unlocked state, the friction plate does not contact the first energy storage shaft, so that the first energy storage shaft can rotate freely. In the locked state, the driving member drives the friction plate to closely adhere to the first energy storage shaft, making the first energy storage shaft unable to rotate. The driving member is a motor or the like.

[0045] In at least one embodiment, the first transmission mechanism is a first gear transmission mechanism. The first gear transmission mechanism includes a meshing first transmission gear 111 and a first mating gear 141. The first transmission gear 111 is arranged on the first transmission shaft 11, and the first mating gear 141 is arranged on the second transmission shaft 14. The gear meshing transmission structure is more reliable. During the long-term transmission process between the first transmission shaft 11 and the second transmission shaft 14, the gear meshing is not easily damaged and has a long service life. It can be understood that as an alternative embodiment, the first transmission mechanism can also be other transmission forms such as pulley transmission and chain transmission.

[0046] In at least one embodiment, the second energy storage part includes a second energy storage shaft and a plurality of second spring energy storage units 51. The plurality of second spring energy storage units 51 are arranged on the second energy storage shaft. The second energy storage shaft is connected to the third transmission shaft 15 through a third clutch 60. The second energy storage shaft rotates driven by the third transmission shaft 15, and the plurality of second spring energy storage units 51 store energy at this time. The short power transmission process results in less energy loss.

[0047] Specifically, the number of the second spring energy storage units 51 is not limited and can be changed according to the environment in which the wind turbine is applied. Each second spring energy storage unit 51 includes a spring and a pull rod. The material of the spring is metal. The spring is sleeved on the second energy storage shaft and is driven by the second energy storage shaft to rotate for energy storage. The outer end structure of the spring is tightened through the pull rod. At this time, the inner circumference of the spring is separated from the second energy storage shaft and is fixed separately. When the potential energy of the spring is saturated, the inner circumference of the spring is connected to the second energy storage shaft and rotates in the same direction as the second energy storage shaft. At this time, the pull rod also returns to the initial state and waits for the next energy storage. The second spring energy storage unit 51 can adopt the structure in the prior art and will not be described in detail here.

[0048] In at least one embodiment, the second energy storage part further includes a second locking structure 52. The second locking structure 52 is arranged on the second energy storage shaft and is electrically connected to the controller 72. The second locking structure 52 has a locked state in which the second energy storage shaft cannot rotate and an unlocked state in which the second energy storage shaft can rotate. When the energy stored in the second energy storage part is full or the second energy storage part is not required to supply energy, the second locking structure 52 is in the locked state at this time. When the second energy storage part needs to release energy, the second locking structure 52 is in the unlocked state at this time.

[0049] Specifically, the second locking structure 52 is sleeved on the second energy storage shaft. The second locking structure 52 includes a swingable friction plate and a driving member. The driving member can drive the friction plate to swing. The friction plate is connected to the housing through a spring. In the unlocked state, the friction plate does not contact the second energy storage shaft, so that the second energy storage shaft can rotate freely. In the locked state, the friction plate drives the friction plate to closely adhere to the second energy storage shaft, making the second energy storage shaft unable to rotate. The driving member is a motor or the like.

[0050] In at least one embodiment, the second transmission mechanism is a second gear transmission mechanism. The second gear mechanism includes a meshing second transmission gear 112 and a second mating gear 151. The second transmission gear 112 is arranged on the first transmission shaft 11, and the second mating gear 151 is arranged on the third transmission shaft 15. The gear meshing transmission structure is more reliable and is not easily damaged during the long-term transmission process between the first transmission shaft 11 and the third transmission shaft 15, and has a long service life. It can be understood that as an alternative embodiment, the second transmission mechanism can also be other transmission forms such as pulley transmission and chain transmission.

[0051] In at least one embodiment, the wind power generation energy storage system further includes a rotational speed sensor. The rotational speed sensor is arranged on one side of the first transmission shaft 11 and is adapted to detect the rotational speed of the first transmission shaft 11 to determine whether the first energy storage part or the second energy storage part has released all the energy at this time. When the first energy storage part or the second energy storage part releases energy, if the rotational speed of the first transmission shaft 11 suddenly drops at this time, it is determined that the first energy storage part or the second energy storage part has exhausted the energy. It can be understood that as an alternative embodiment, a rotation cycle counter can also be arranged on one side of the first energy storage shaft and the second energy storage shaft respectively, or a rotation cycle counter can be arranged on one side of the first transmission shaft 11, and the number of rotations of the first transmission shaft 11 or the energy storage shaft is used to determine whether all the energy has been released.

[0052] The present invention also provides a wind turbine, which includes: a generator 10, blades 12 and the above-mentioned wind power generation energy storage system. The generator 10 is connected to the first transmission shaft 11 of the wind power generation energy storage system, and the blades 12 are connected to the main shaft 13 of the wind power generation energy storage system.

[0053] In at least one embodiment, the wind turbine further includes a housing 80. The main shaft 13 passes through the housing 80. The first transmission shaft 11, the generator 10, the first energy storage part and the second energy storage part are all arranged inside the housing 80. The housing 80 can effectively protect the internal components. At the same time, the transmission distance between the first energy storage part and the second energy storage part is relatively short, effectively reducing the energy loss during the transmission process.

[0054] Specifically, the wind speed sensor 71 is arranged on the outer wall of the housing 80 and contacts the outside to detect the wind speed. The detection method is simple and reliable.

[0055] The usage method of the wind turbine in this embodiment will be described as follows:

[0056] When the wind speed of the external environment is within the first preset wind speed range and / or the rotational speed of the main shaft 13 is within the first preset rotational speed range, the first clutch 20 is in the engaged state, and the second energy storage part is in the energy storage state; when the wind speed of the external environment is within the second preset wind speed range and / or the rotational speed of the main shaft 13 is within the second preset rotational speed range, the first clutch 20 is in the engaged state, and the first energy storage part is in the energy storage state;

[0057] When the wind speed of the external environment is within the first preset wind speed range and / or the rotational speed of the main shaft 13 is within the first preset rotational speed range, at this time, the controller 72 controls the first clutch 20 and the third clutch 60 to be in the engaged state. At this time, the second locking structure 52 is in the unlocked state. At this time, the blade 12 drives the first transmission shaft 11 to rotate and generate electricity through the main shaft 13. At the same time, the first transmission shaft 11 drives the second energy storage part to store energy;

[0058] When the wind speed of the external environment is within the second preset wind speed range and / or the rotational speed of the main shaft 13 is within the second preset rotational speed range, at this time, the controller 72 controls the first clutch 20 and the second clutch 40 to be in the engaged state. At this time, the first locking structure 32 is in the unlocked state. At this time, the blade 12 drives the first transmission shaft 11 to rotate and generate electricity through the main shaft 13. At the same time, the first transmission shaft 11 drives the first energy storage part to store energy;

[0059] When the wind speed is less than the minimum value of the first preset wind speed range and / or the rotational speed is less than the minimum value of the first preset rotational speed range, at this time, the controller 72 controls the first clutch 20 and the second clutch 40 to be in the disengaged state, the controller 72 controls the third clutch 60 to be in the engaged state, and at the same time, the first locking structure 32 is in the locked state, and the second locking structure 52 is in the unlocked state. At this time, the second energy storage part drives the first transmission shaft 11 to rotate and generate electricity. If the energy of the second energy storage part is exhausted, the third clutch 60 is made to be in the disengaged state, the second clutch 40 is made to be in the engaged state, and the second locking structure 52 becomes the unlocked state. At this time, the first energy storage part continues to drive the shaft to rotate and generate electricity. The first transmission shaft 11 is first driven to rotate by the second energy storage part with smaller elastic energy release, and then driven to rotate by the first energy storage part with larger elastic energy release, so that the rotation becomes slower to faster, and the speed change is smoother;

[0060] When the wind speed is greater than the maximum value of the second preset wind speed range and / or the rotational speed is greater than the maximum value of the second preset rotational speed range, the controller 72 controls the first clutch 20 and the third clutch 60 to be in the disengaged state, the controller 72 controls the second clutch 40 to be in the engaged state, and at the same time the second locking structure 52 is in the locked state and the first locking structure 32 is in the unlocked state. At this time, the first energy storage unit drives the first transmission shaft 11 to rotate and generate electricity. If the first energy storage unit runs out of energy, the second clutch 40 is disengaged and the third clutch 60 is engaged, and the first locking structure 32 becomes unlocked. At this time, the second energy storage unit continues to drive the first transmission shaft 11 to rotate and generate electricity. The first transmission shaft 11 is first driven to rotate by the first energy storage unit with greater elastic energy release and then by the second energy storage unit with smaller elastic energy release, so that the rotation speed decreases from fast to slow and the speed change is smoother.

[0061] The present invention also provides a wind power generation energy storage control method, which includes the following steps: obtaining the wind speed of the external environment and / or the rotational speed of the main shaft 13; controlling the state of the first clutch 20, the state of the first energy storage unit and the state of the second energy storage unit according to the wind speed and / or the rotational speed. During normal power generation, the main shaft 13 drives the first transmission shaft 11 to rotate. The first energy storage unit and the second energy storage unit are in transmission cooperation with the first transmission shaft 11 and store energy under different wind speeds and / or rotational speeds of the main shaft 13 to achieve energy storage in different scenarios; when there is no wind or the wind force is small in the external environment, the first clutch 20 is in the disengaged state, the main shaft 13 is disconnected from the first transmission shaft 11, and at least one of the first energy storage unit and the second energy storage unit can drive the first transmission shaft 11 to rotate. In the case of no wind, the generator 10 can still generate electricity and operate, and the power generation process is continuous and can achieve non-stop operation, making the wind turbine operate more stably and without loss.

[0062] In at least one embodiment, the steps of controlling the states of the first clutch 20, the first energy storage unit, and the second energy storage unit according to the wind speed or rotational speed include: determining whether the wind speed is within the first preset wind speed range and / or whether the rotational speed is within the first preset rotational speed range; when the wind speed is within the first preset wind speed range and / or the rotational speed is within the first preset rotational speed range, controlling the first clutch 20 to engage and the second energy storage unit to store energy; when the wind speed is outside the first preset wind speed range and / or the rotational speed is outside the first preset rotational speed range, determining whether the wind speed is within the second preset wind speed range and / or whether the rotational speed is within the second preset rotational speed range; when the wind speed is within the second preset wind speed range and / or the rotational speed is within the second preset rotational speed range, the first clutch 20 is in the engaged state and the first energy storage unit is in the energy storage state; when the wind speed is outside the first preset wind speed range and the second preset wind speed range and / or the rotational speed is outside the first preset rotational speed range and the second preset rotational speed range, controlling the first clutch 20 to disengage, and the first energy storage unit and / or the second energy storage unit to release energy. The first energy storage unit and the second energy storage unit can release energy separately or simultaneously, making the energy release method more diverse. Through the different potential energy sequences of the first energy storage unit and the second energy storage unit, the rotational speed fluctuation of the first transmission shaft 11 is smaller, and the impact received when the first clutch 20 engages is also smaller.

[0063] In at least one embodiment, when the wind speed is outside the first preset wind speed range and the second preset wind speed range and / or the rotational speed is outside the first preset rotational speed range and the second preset rotational speed range, the steps of controlling the first clutch 20 to be in the disengaged state and the first energy storage unit and / or the second energy storage unit to be in the energy release state include: when the wind speed is less than the minimum value of the first preset wind speed range or the rotational speed is less than the minimum value of the first preset rotational speed range, the energy release priority of the second energy storage unit is higher than that of the first energy storage unit; when the wind speed is greater than the maximum value of the second preset wind speed range or the rotational speed is greater than the maximum value of the second preset rotational speed range, the energy release priority of the first energy storage unit is higher than that of the second energy storage unit. By changing the energy release priority of the energy storage unit according to different preset wind speed ranges and / or different preset rotational speed ranges, the energy release process is made more reasonable.

[0064] In at least one embodiment, after the step of controlling the first clutch 20 to engage, the wind power generation energy storage control method further includes: determining whether the energy stored in the first energy storage unit reaches its maximum storage energy; when the energy stored in the first energy storage unit reaches its maximum storage energy, controlling the second clutch 40 to disengage; determining whether the energy stored in the second energy storage unit reaches its maximum storage energy; when the energy stored in the second energy storage unit reaches its maximum storage energy, controlling the third clutch 60 to disengage.

[0065] Specifically, when the energy stored in the first energy storage unit reaches its maximum energy storage capacity, the second clutch 40 is controlled to disengage, and at the same time, the first locking structure 32 is brought into a locked state. When the energy stored in the second energy storage unit reaches its maximum energy storage capacity, the third clutch 60 is controlled to disengage, and at the same time, the second locking structure 52 is brought into a locked state. It can be understood that as an alternative implementation, it is also possible not to determine whether the energy stored in the first energy storage unit and the second energy storage unit reaches the maximum energy storage capacity, and the first energy storage unit and the second energy storage unit continue to rotate following the first transmission shaft 11 when they are fully charged.

[0066] In at least one embodiment, after the step of controlling the first clutch 20 to disengage, the wind power energy storage control method further includes: determining whether the energy released by the second energy storage unit reaches its maximum energy storage capacity; when the energy released by the second energy storage unit reaches its maximum energy storage capacity, controlling the third clutch 60 to disengage and controlling the second clutch 40 to engage; determining whether the energy released by the first energy storage unit reaches its maximum energy storage capacity; when the energy released by the first energy storage unit reaches its maximum energy storage capacity, controlling the second clutch 40 to disengage.

[0067] Specifically, when the energy released by the second energy storage unit reaches its maximum energy storage capacity, controlling the third clutch 60 to disengage, controlling the second clutch 40 to engage, and at the same time bringing the first locking structure 32 into an unlocked state. When the energy released by the first energy storage unit reaches its maximum energy storage capacity, controlling the second clutch 40 to disengage and at the same time bringing the second locking structure 52 into an unlocked state.

[0068] In at least one embodiment, after the step of controlling the first clutch 20 to disengage, the wind power energy storage control method further includes: determining whether the energy released by the first energy storage unit reaches its maximum energy storage capacity; when the energy released by the first energy storage unit reaches its maximum energy storage capacity, controlling the second clutch 40 to disengage and controlling the third clutch 60 to engage; determining whether the energy released by the second energy storage unit reaches its maximum energy storage capacity; when the energy stored in the second energy storage unit reaches its maximum energy storage capacity, controlling the third clutch 60 to disengage.

[0069] Specifically, when the energy released by the first energy storage unit reaches its maximum energy storage capacity, controlling the second clutch 40 to disengage, controlling the third clutch 60 to engage, and at the same time bringing the second locking structure 52 into an unlocked state. When the energy stored in the second energy storage unit reaches its maximum energy storage capacity, controlling the third clutch 60 to disengage and at the same time bringing the first locking structure 32 into an unlocked state.

[0070] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0071] 1. In at least one embodiment, a first clutch 20 is provided between the first transmission shaft 11 and the main shaft 13. During normal power generation, the main shaft 13 drives the first transmission shaft 11 to rotate. The first energy storage unit and the second energy storage unit are in transmission cooperation with the first transmission shaft 11 and store energy at different wind speeds and / or different rotational speeds of the main shaft 13, achieving energy storage in different scenarios. When the external wind force is small or too large, the first clutch 20 is in the disengaged state, the main shaft 13 is disconnected from the first transmission shaft 11, and the first energy storage unit and the second energy storage unit can adjust the potential energy sequence according to the change of the external wind speed and drive the first transmission shaft 11 to rotate. While the energy utilization rate is higher, the first transmission shaft 11 can rotate continuously. Even in the case of no wind, the generator 10 can still generate electricity and operate, and the power generation process is continuous and can achieve non-stop operation, making the wind turbine operate more stably and without loss, effectively reducing the impact of the wind power generation equipment on the power grid operation in the case of no wind or small wind force.

[0072] 2. In at least one embodiment, the wind turbine further includes a wind speed sensor 71 and a speed sensor 73. The controller 72 automatically controls the states of the respective clutches according to the wind speed signal measured by the wind speed sensor 71 and / or the rotational speed signal measured by the speed sensor 73, enabling the wind turbine to maintain a normal working state, enabling the wind turbine to continuously generate electricity in a windless state, and at the same time enabling the wind turbine to avoid being damaged due to excessive rotational speed, making the control process more intelligent.

[0073] 3. In at least one embodiment, the transmission ratio of the first transmission shaft 11 to the third transmission shaft 15 is greater than 1. When the rotational speed of the first transmission shaft 11 is low, the torque can be increased, enabling the second energy storage unit to still store energy. At the same time, when the second energy storage unit outputs energy, it can also keep the first transmission shaft 11 at a certain rotational speed. The elastic energy released by the first energy storage unit is relatively large and mainly stores energy when the rotational speed of the first transmission shaft 11 is high. The transmission ratio of the first transmission shaft 11 to the third transmission shaft 15 is less than or equal to 1. When the rotational speed of the first transmission shaft 11 is high, it can quickly store energy. At the same time, when the first clutch 20 is disengaged when the external wind speed exceeds the predetermined value, it can still drive the first transmission shaft 11 to rotate at a high speed, preventing the sudden decrease in the rotational speed of the first transmission shaft 11 from reducing the power generation efficiency of the generator 10 and affecting the power grid operation.

[0074] Obviously, the above embodiments are only examples given for clear illustration and are not limitations on the embodiments. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to enumerate all the embodiments here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A wind power generation energy storage system, characterized in that, Comprising: A first transmission shaft (11), adapted to drive a generator (10) of a wind turbine to generate electricity; A main shaft (13), adapted to be driven by blades (12) of a wind turbine to rotate and transmit power, the main shaft (13) being connected to the first transmission shaft (11) through a first clutch (20), the first clutch (20) having an engaged state and a disengaged state, when the first clutch (20) is in the engaged state, power can be transmitted between the main shaft (13) and the first transmission shaft (11), when the first clutch (20) is in the disengaged state, power cannot be transmitted between the main shaft (13) and the first transmission shaft (11); A first energy storage unit, in transmission cooperation with the first transmission shaft (11), the first energy storage unit having an energy storage state and an energy release state; A second energy storage unit, in transmission cooperation with the first transmission shaft (11), the second energy storage unit having an energy storage state and an energy release state; Wherein, the maximum stored energy of the first energy storage unit is greater than the maximum stored energy of the second energy storage unit; When the wind speed of the external environment is within a first preset wind speed range and / or the rotational speed of the main shaft (13) is within a first preset rotational speed range, the first clutch (20) is in the engaged state and the second energy storage unit is in the energy storage state; When the wind speed of the external environment is within a second preset wind speed range and / or the rotational speed of the main shaft (13) is within a second preset rotational speed range, the first clutch (20) is in the engaged state and the first energy storage unit is in the energy storage state; The maximum value of the first preset wind speed range is less than or equal to the minimum value of the second preset wind speed range, and the maximum value of the first preset rotational speed range is less than or equal to the minimum value of the second preset rotational speed range; When the wind speed of the external environment is outside the first preset wind speed range and the second preset wind speed range and / or the rotational speed of the main shaft (13) is outside the first preset rotational speed range and the second preset rotational speed range, when the first clutch (20) is in the disengaged state, the first energy storage unit and / or the second energy storage unit is in the energy release state; A second transmission shaft (14), connected to the first transmission shaft (11) through a first transmission mechanism, the transmission ratio of the first transmission shaft (11) to the second transmission shaft (14) being less than or equal to 1; A second clutch (40), respectively connected to the first energy storage unit and the second transmission shaft (14), the second clutch (40) having an engaged state and a disengaged state, when the second clutch (40) is in the engaged state, power can be transmitted between the first transmission shaft (11) and the first energy storage unit, when the second clutch (40) is in the disengaged state, power cannot be transmitted between the first transmission shaft (11) and the first energy storage unit; A third transmission shaft (15), connected to the first transmission shaft (11) through a second transmission mechanism, the transmission ratio of the first transmission shaft (11) to the third transmission shaft (15) being greater than 1; A third clutch (60) is connected between the third transmission shaft (15) and the second energy storage unit. The third clutch (60) has an engaged state and a disengaged state. When the third clutch (60) is in the engaged state, power can be transmitted between the first transmission shaft (11) and the second energy storage unit. When the third clutch (60) is in the disengaged state, power cannot be transmitted between the first transmission shaft (11) and the second energy storage unit.

2. The wind power energy storage system according to claim 1, wherein, It further includes: A controller (72) is electrically connected to the first clutch (20), and the controller (72) controls the first clutch (20) to switch between its engaged state and disengaged state.

3. The wind power generation energy storage system according to claim 2, wherein The wind power generation energy storage system further includes a wind speed sensor (71). The wind speed sensor (71) is adapted to detect the wind speed of the external environment. The controller (72) is electrically connected to the wind speed sensor (71), and the controller (72) controls the first clutch (20) to switch between its engaged state and disengaged state according to the wind speed detected by the wind speed sensor (71); and / or, the wind power generation energy storage system further includes a speed sensor (73). The speed sensor (73) is adapted to detect the rotational speed of the main shaft (13). The controller (72) is electrically connected to the speed sensor (73), and the controller (72) controls the first clutch (20) to switch between its engaged state and disengaged state according to the rotational speed detected by the speed sensor (73).

4. The wind power generation energy storage system according to any one of claims 1 to 3, wherein When the wind speed is less than the minimum value of the first preset wind speed range and / or the rotational speed is less than the minimum value of the first preset rotational speed range, the energy release priority of the second energy storage unit is higher than that of the first energy storage unit; When the wind speed is greater than the maximum value of the second preset wind speed range and / or the rotational speed is greater than the maximum value of the second preset rotational speed range, the energy release priority of the first energy storage unit is higher than that of the second energy storage unit.

5. A wind turbine, characterized in that, It includes: A generator (10), blades (12), and the wind power generation energy storage system according to any one of claims 1 to 4. The generator (10) is driven by the first transmission shaft (11) of the wind power generation energy storage system to generate electricity, and the blades (12) drive the main shaft (13) of the wind power generation energy storage system to rotate.

6. A wind power energy storage control method, which is applied to the wind power energy storage system described in any one of claims 1 to 4, and is characterized in that, It includes the following steps: Obtain the wind speed of the external environment and / or the rotational speed of the main shaft (13); Control the state of the first clutch (20), and the states of the first energy storage unit and the second energy storage unit according to the wind speed and / or the rotational speed.

7. The wind power generation energy storage control method according to claim 6, wherein The step of controlling the state of the first clutch (20), and the states of the first energy storage unit and the second energy storage unit according to the wind speed or the rotational speed includes: Judge whether the wind speed is within the first preset wind speed range and / or whether the rotational speed is within the first preset rotational speed range; When the wind speed is within the first preset wind speed range and / or the rotational speed is within the first preset rotational speed range, control the first clutch (20) to engage, and the second energy storage unit stores energy; When the wind speed is outside the first preset wind speed range and / or the rotational speed is outside the first preset rotational speed range, determine whether the wind speed is within the second preset wind speed range and / or whether the rotational speed is within the second preset rotational speed range; When the wind speed is within the second preset wind speed range and / or the rotational speed is within the second preset rotational speed range, the first clutch (20) is in an engaged state, and the first energy storage unit is in an energy storage state; When the wind speed is outside the first preset wind speed range and the second preset wind speed range and / or the rotational speed is outside the first preset rotational speed range and the second preset rotational speed range, control the first clutch (20) to disengage, and the first energy storage unit and / or the second energy storage unit releases energy.

8. The wind power energy storage control method according to claim 7, wherein When the wind speed is outside the first preset wind speed range and the second preset wind speed range and / or the rotational speed is outside the first preset rotational speed range and the second preset rotational speed range, the step of controlling the first clutch (20) to be in a disengaged state, and the first energy storage unit and / or the second energy storage unit to be in an energy release state includes: When the wind speed is less than the minimum value of the first preset wind speed range or the rotational speed is less than the minimum value of the first preset rotational speed range, the energy release priority of the second energy storage unit is higher than that of the first energy storage unit; When the wind speed is greater than the maximum value of the second preset wind speed range or the rotational speed is greater than the maximum value of the second preset rotational speed range, the energy release priority of the first energy storage unit is higher than that of the second energy storage unit.

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