Novel wind turbine generator tower energy storage integrated system and control method thereof

Abstract

The embodiment of the invention provides a novel wind turbine generator tower energy storage integrated system and a control method thereof, the system comprises a tower outer wall and a tower inner wall, and an energy storage space is arranged between the tower outer wall and the tower inner wall; a supporting structure is fixed in the energy storage space; a cabin ventilation opening is formed in the wind power generator cabin; the cooling fan is located at the top of a space formed by the tower inner wall; the energy storage system is located in the energy storage space and arranged on the supporting structure. The tower is reasonable in structural arrangement, the tower and the energy storage system are integrated together, occupied space is saved, the occupied space cost is reduced, and the operation efficiency and the heat dissipation effectiveness of the energy storage system are improved; the method is simple in steps, can comprehensively consider factors such as the generator rate of the wind generator, the power grid demand power, the energy storage system electric quantity state and the energy storage system temperature, ensures that the energy storage system is in the optimal state, and prolongs the service life of the energy storage system.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to a novel wind turbine tower energy storage integrated system and a control method thereof. Background Art

[0002] The tower of a wind turbine is the main component of wind power generation. The towers of existing technologies mostly use a single structure to bear wind loads. It mainly provides support, transfers loads, and ensures the stability of the wind turbine. At the same time, it cooperates with the energy storage system designed separately on the ground of the wind farm, and is connected to the wind turbine through the power grid or DC bus. Existing wind turbine towers do not integrate energy storage systems on a large scale, mainly because: the internal space of the tower is limited, and traditional towers are not designed with space suitable for energy storage. Factors such as heat dissipation, weight, and structural strength of the energy storage system limit its integrated application with the tower, and existing wind farms still rely on centralized energy storage, and do not fully consider the adaptability of the wind turbine body to energy storage;

[0003] At present, the energy storage system of wind farms mainly adopts liquid cooling or air cooling. The liquid cooling system removes the heat generated by the battery pack through the circulation of water or other coolants, but requires additional pumps and heat dissipation devices, which increases the complexity and energy consumption of the system; the air cooling system relies on fans to dissipate heat, which is relatively low in cost, but the heat dissipation capacity is limited during high-power charging and discharging, which can easily cause the battery temperature to be too high, affecting performance and life.

[0004] The control strategy of the existing energy storage system mainly considers the mismatch between grid demand and wind turbine power generation, but does not fully consider the power and temperature factors of the energy storage system itself. Although it can meet the general use needs, there are still certain technical deficiencies. The internal space of the traditional tower is limited and there is no space designed for energy storage, which will greatly increase the floor space of the overall device and the construction cost of the wind farm.

[0005] The heat dissipation, weight and structural strength of the energy storage system will also limit its integrated application with the tower, which is not conducive to heat dissipation and control operations. In actual application, the energy storage system will generate a large amount of heat during the charging and discharging process. When the heat cannot be effectively dissipated, it will cause the temperature of the energy storage system to change, which will affect the service life of the energy storage system. Since the energy storage system operates independently, it is not integrated and optimized with other components of the wind turbine, which will also reduce the economy and efficiency of the energy storage system.

[0006] Moreover, since the tower and energy storage system of the wind turbine set operate independently, the energy storage system is not considered to be combined with the tower. This will not only cause a large waste of space, but also fail to take advantage of the tower to solve the heat dissipation and vibration problems, and its applicability is limited. Summary of the invention

[0007] In view of this, an object of an embodiment of the present invention is to provide a novel integrated system for tower energy storage of a wind turbine and its control method to solve at least one of the above technical problems.

[0008] To achieve the above object in the first aspect, an embodiment of the present invention provides a novel integrated system for tower energy storage of a wind turbine, which is arranged at the bottom of a wind turbine nacelle and includes a tower outer wall and a tower inner wall. An energy storage storage space is arranged between the tower outer wall and the tower inner wall;

[0009] A plurality of parallel support structures for supporting the energy storage system are fixed in the energy storage storage space;

[0010] A nacelle ventilation opening is arranged in the wind turbine nacelle;

[0011] The top of the energy storage storage space is communicated with the nacelle ventilation opening, and a cooling fan is at the top of the space formed by the tower inner wall;

[0012] The energy storage system is arranged in the energy storage storage space and on the support structure.

[0013] Further preferably: An inner platform at the top of the tower is fixed in the upper part of the space formed by the tower inner wall, and parallel inner platforms of the tower are arranged in the middle and lower parts of the space formed by the tower inner wall;

[0014] A plurality of air flow holes on the tower inner wall are arranged in the upper part of the tower inner wall, and a plurality of lower air flow holes on the tower inner wall are arranged in the middle part of the tower inner wall;

[0015] Both the air flow holes on the tower inner wall and the lower air flow holes on the tower inner wall are communicated with the energy storage storage space;

[0016] The air flow holes on the tower inner wall are above the inner platform at the top of the tower, and the lower air flow holes on the tower inner wall are below the inner platform at the top of the tower.

[0017] Further preferably: Tower bottom ventilation openings are provided at the bottoms of both the tower outer wall and the tower inner wall.

[0018] Further preferably: An inclined guide plate arranged in a shape of an eight-character is fixed between the bottom surface of the support structure and the inner wall of the energy storage storage space, and the narrow end of the inclined guide plate is fixed to the bottom surface of the support structure.

[0019] Further preferably: The inner platform at the top of the tower is an airtight flat plate;

[0020] Both the inner platform of the tower and the support structure are breathable grille flat plates.

[0021] Further preferably, both the outer wall and the inner wall of the tower are metal steel structures or concrete structures.

[0022] Further preferably, the energy storage system is a modular lithium battery or a modular electrochemical battery.

[0023] Further preferably, the number of the energy storage systems is multiple, and the energy storage systems are arranged staggeredly in the circumferential direction; a controller connected to a wind vane anemometer is further included;

[0024] The controller is connected to the energy storage system, a valve element arranged on the bottom ventilation opening of the tower, and a cooling fan;

[0025] It is used to control the energy storage system, the opening degree of the valve element arranged on the bottom ventilation opening of the tower, and the working state of the cooling fan.

[0026] Furthermore, the bottom ventilation opening of the tower is used to introduce cooling media into the inner space of the tower surrounded by the inner wall of the tower and the energy storage storage space respectively, and cool the energy storage system arranged at the bottom end of the tower through the cooling media;

[0027] The first group of the inclined guide plates is used to accelerate the airflow of the heated cooling media after passing through the energy storage system at the bottom end of the tower;

[0028] The energy storage systems arranged at the bottom end, the middle part, and the top end of the tower are arranged staggeredly in the circumferential direction;

[0029] The airflow holes on the inner wall of the tower and the lower airflow holes on the inner wall of the tower are used to intersect the cooling media in the inner space of the tower with the heated cooling media in the energy storage storage space to form an intersecting cooling media;

[0030] The second group of the inclined guide plates is further used to accelerate the intersecting cooling media and cool the energy storage system at the top end of the tower;

[0031] The nacelle ventilation opening is used to discharge the intersecting cooling media after heat exchange out of the wind turbine;

[0032] The bottom ventilation opening of the tower is used to close the bottom ventilation opening of the tower in response to the control instruction of the controller when the current temperature of the energy storage system is in the first preset temperature range; when the temperature of the energy storage system is in the second preset temperature range, the opening degree of the bottom ventilation opening of the tower is adjusted to a partially open state in response to the control instruction of the controller; when the temperature of the energy storage system is in the third preset temperature range, the opening degree of the bottom ventilation opening of the tower is adjusted to a fully open state in response to the control instruction of the controller; the first preset temperature range, the second preset temperature range, and the third preset temperature range increase in sequence;

[0033] The cooling fan is used to, when the temperature of the energy storage system is within a third preset temperature range, respond to the control instruction of the controller to turn on forced air cooling, and after the cooling medium in the internal space of the tower and the heated cooling medium in the energy storage space meet, accelerate and convey them to the nacelle ventilation opening to discharge the wind turbine generator set.

[0034] In a second aspect, a control method for a novel integrated system of a wind turbine tower and energy storage is provided. The method is based on the novel integrated system of a wind turbine tower and energy storage described in the first aspect, and the method includes the following steps:

[0035] Obtain the power generation power of the wind turbine generator set, the grid load power, the current state of charge of the energy storage system, the current temperature of the energy storage system, and the power of the energy storage system;

[0036] According to the grid load power, the current state of charge of the energy storage system, and the current temperature of the energy storage system, determine whether the trigger condition for the discharge operation is met or whether the trigger condition for the charge operation is met;

[0037] When the start condition for the discharge operation is met, start the discharge operation of the energy storage system, and control the working process of the discharge operation according to the power generation power of the wind turbine generator set, the power of the energy storage system, and the grid load power;

[0038] When the start condition for the charge operation is met, start the charge operation of the energy storage system, and control the working process of the charge operation according to the power generation power of the wind turbine generator set, the grid load power, and the current state of charge of the energy storage system.

[0039] Furthermore, the method further includes:

[0040] When the temperature of the energy storage system is within a first preset temperature range, close the bottom ventilation openings of the outer wall and the inner wall of the tower;

[0041] When the temperature of the energy storage system is within a second preset temperature range, adjust the opening degree of the bottom ventilation opening of the tower to a partially open state;

[0042] When the temperature of the energy storage system is within a third preset temperature range, adjust the opening degree of the bottom ventilation opening of the tower to a fully open state and activate the forced cooling device;

[0043] Wherein, the first preset temperature range, the second preset temperature range, and the third preset temperature range increase in sequence.

[0044] Furthermore, the method further includes:

[0045] When the temperature of the energy storage system reaches the first critical temperature value, reduce the charge-discharge rate of the energy storage system;

[0046] When the temperature of the energy storage system reaches the second critical temperature value, control the energy storage system to stop the charging operation and the discharging operation;

[0047] When the temperature of the energy storage system reaches the third critical temperature value, reduce the charging power of the energy storage system;

[0048] Wherein, the third critical temperature value is less than the first critical temperature value, and the first critical temperature value is less than the second critical temperature value.

[0049] Further, the triggering conditions for the discharging operation include:

[0050] The grid load power reaches or exceeds the first preset grid load threshold, and the first preset grid load threshold is a high-proportion corresponding value of the grid load rated value;

[0051] The current state of charge of the energy storage system is greater than the first preset state of charge threshold;

[0052] The current temperature of the energy storage system is lower than the temperature safety threshold.

[0053] Further, the triggering conditions for the charging operation include:

[0054] The grid load power reaches or is lower than the second preset grid load threshold, and the second preset grid load threshold is a low-proportion corresponding value of the grid load rated value;

[0055] The current state of charge of the energy storage system is less than the second preset state of charge threshold;

[0056] The current temperature of the energy storage system is lower than the temperature safety threshold;

[0057] Wherein the second preset state of charge threshold is greater than the first preset state of charge threshold.

[0058] Further, controlling the working process of the discharging operation according to the power generation power of the wind turbine, the power of the energy storage system, and the grid load power specifically includes:

[0059] Compare the relationship between the sum of the power of the wind turbine and the power of the energy storage system and the grid load power in real time;

[0060] When the sum of the powers is equal to the grid load power, maintain the current discharging power of the energy storage system;

[0061] When the sum of the powers exceeds the grid load power, reduce the discharging power of the energy storage system;

[0062] When the sum of the powers is lower than the grid load power, increase the discharge power of the energy storage system.

[0063] Furthermore, controlling the working process of the charging operation according to the power generation power of the wind turbine generator set, the grid load power, and the current state of charge of the energy storage system specifically includes:

[0064] When the power of the wind turbine generator set continuously exceeds the grid load power, maintain the current charging rate of the energy storage system;

[0065] When the power of the wind turbine generator set is close to or equal to the grid load power, reduce the charging rate of the energy storage system;

[0066] When it is detected that the state of charge of the energy storage system reaches the second preset state of charge threshold, terminate the charging operation and give feedback to the wind turbine generator set.

[0067] Furthermore, the wind turbine generator set realizes the dynamic matching of the power generation power and the grid load power through the pitch control mechanism and the variable speed control mechanism.

[0068] The above technical solution has the following beneficial effects:

[0069] 1. The structure of the present invention is reasonably arranged. There is an energy storage storage space between the outer wall and the inner wall of the tower. And several parallel support structures for supporting the energy storage system are fixed in the energy storage storage space, so that the energy storage system can be arranged between the outer wall and the inner wall of the tower and supported by the support structure, integrating the tower with the energy storage system, which is beneficial to saving the occupied space, reducing the land occupation cost, and also beneficial to improving the operation efficiency and heat dissipation effectiveness of the energy storage system;

[0070] 2. The top of the energy storage storage space is connected to the ventilation opening of the nacelle. The cooling fan is at the top of the space formed by the inner wall of the tower and, in cooperation with the air flow holes on the inner wall of the tower, the air flow holes under the inner wall of the tower and the ventilation opening at the bottom of the tower, can achieve the chimney effect, which is beneficial to realizing the temperature control of the energy storage system, improving the heat dissipation and energy conduction performance, facilitating the release of a large amount of heat, and improving the saving effect;

[0071] 3. An inclined guide plate arranged in a shape of an eight - character is fixed between the bottom surface of the support structure and the inner wall of the energy storage storage space. Through the inclined guide plate, it is beneficial to accelerate the air flow and improve the efficiency of chimney heat dissipation;

[0072] 4. The inner platform at the top of the tower is an airtight flat plate; the inner platforms and support structures inside the tower are all breathable grille flat plates, which can not only effectively realize the support and positioning of the inner and outer walls of the tower, ensuring the smoothness and reliability of the use of the entire structure, but also the inner platform at the top of the tower is an airtight flat plate, cooperating with other breathable grille flat plates, which can ensure the effectiveness, smoothness and reliability of the chimney's heat dissipation;

[0073] 5. The number of energy storage systems is multiple, and the energy storage systems are arranged staggeredly in the circumferential direction. Through the above structure, when the chimney dissipates heat, the energy storage systems can be effectively and quickly cooled, which is beneficial to improving the smoothness and reliability of the use of the energy storage systems;

[0074] 6. A control method for a novel wind turbine tower energy storage integration system is provided, which can comprehensively consider factors such as the generator rate of the wind turbine, the power demand of the power grid, the state of charge of the energy storage system, and the temperature of the energy storage system, and thus can ensure that the energy storage system is in the best state and can also improve the service life of the energy storage system;

[0075] 7. Through the situation of the temperature of the energy storage system, the opening state of the ventilation opening at the bottom of the tower is adjusted, and different heat dissipation methods can be realized according to different situations, so as to improve the overall heat dissipation effectiveness, smoothness and reliability.

[0076] 8. The embodiment of the present invention makes full use of the natural cooling generated by the chimney effect and adopts forced air cooling when the temperature exceeds the threshold, thereby saving energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0077] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only 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.

[0078] Figure 1 is a schematic structural diagram of a wind turbine generator set according to an embodiment of the present invention;

[0079] Figure 2 is a schematic structural diagram of the tower energy storage integration system in an embodiment of the present invention;

[0080] Figure 3 is Figure 2 the sectional view taken along line A-A in;

[0081] Figure 4 is Figure 2 the sectional view taken along line B-B in;

[0082] Figure 5 is Figure 2Schematic diagram of the C-C sectional structure;

[0083] Figure 6 is Figure 2 Schematic diagram of the D-D sectional structure;

[0084] Figure 7 is Figure 2 Schematic diagram of the E-E sectional structure;

[0085] Figure 8 is Figure 2 Schematic diagram of the F-F sectional structure;

[0086] Figure 9 is the discharge logic diagram of the energy storage system in the embodiment of the present invention;

[0087] Figure 10 is the charging logic diagram of the energy storage system in the embodiment of the present invention;

[0088] Figure 11 is the temperature control flow chart of the energy storage system in the embodiment of the present invention.

[0089] Reference numerals:

[0090] 1. Wind turbine nacelle; 2. Tower outer wall; 3. Tower inner wall; 4. Energy storage storage space; 5. Energy storage system; 6. Support structure; 7. Nacelle ventilation opening; 8. Cooling fan; 9. Inner platform at the top of the tower; 10. Inner platform of the tower; 11. Air flow holes on the inner wall of the tower; 12. Air flow holes at the bottom of the inner wall of the tower; 13. Ventilation opening at the bottom of the tower; 14. Inclined deflector.

[0091] 1-1. Generator; 1-2. Gearbox; 1-3. Transmission shaft; 1-4. Hub; 1-5. Blade; 1-6. Power cable; 1-7. Inverter. Detailed implementation manners

[0092] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, many specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is only intended to provide a better understanding of the present invention by showing examples of the present invention. In the drawings and the following description, at least some of the well-known structures and technologies are not shown in order to avoid unnecessarily obscuring the present invention; and, for clarity, the dimensions of some structures may be exaggerated. In addition, the features, structures, or characteristics described below may be combined in any suitable manner in one or more embodiments.

[0093] Such as Figures 1 to 8As shown in the figure, a new type of integrated tower energy storage system for wind turbines is installed at the bottom of the nacelle 1 of the wind turbine. It includes a tower outer wall 2 and a tower inner wall 3, and an energy storage storage space 4 is arranged between the tower outer wall 2 and the tower inner wall 3. In this embodiment, as Figure 1 shown, a generator 1-1, a gearbox 1-2 connected to the generator 1-1, and a transmission shaft 1-3 connected to the gearbox 1-2 are arranged inside the nacelle 1 of the wind turbine. A hub 1-4 connected to the transmission shaft 1-3 and blades 1-5 fixed on the hub 1-4 are arranged outside the nacelle 1 of the wind turbine. The above structures are all conventional structures of the prior art, so they are not described in detail. And the generator 1-1 is connected to an inverter 1-7 through a power cable 1-6. Among them, both the tower outer wall 2 and the tower inner wall 3 are metal steel structures or concrete structures.

[0094] As Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 shown, several parallel support structures 6 for supporting the energy storage system 5 are fixed in the energy storage storage space 4. In this embodiment, the number of the support structures 6 is at least three, which are respectively arranged at the top section, the middle section and the bottom of the tower outer wall 2. The support structure 6 can not only be used for connection and support to ensure the stability and reliability of the whole structure, but also can place the energy storage system 5. In order to improve the use convenience, the number of the energy storage systems 5 is multiple, and the energy storage systems 5 are arranged staggeredly in the circumferential direction. By adopting the staggered arrangement, the new type of integrated tower energy storage system for wind turbines further includes a controller; the controller is connected to a wind vane anemometer, the energy storage system 5, a valve element arranged on a tower bottom ventilation opening 13, and a cooling fan 8; and is used for controlling the working states of the energy storage system 5, the valve element arranged on the tower bottom ventilation opening 13, and the cooling fan 8. The temperature of the energy storage system refers to the temperature of the battery, so as to ensure the effectiveness and reliability of the chimney diversion heat dissipation.

[0095] As Figure 2 shown, a nacelle ventilation opening 7 is arranged inside the nacelle 1 of the wind turbine. The nacelle ventilation opening 7 is mainly used for exhausting air to ensure the effectiveness and reliability of the chimney effect. And the top of the energy storage storage space 4 is communicated with the nacelle ventilation opening 7, and the cooling fan 8 is located in the space formed by the tower inner wall 3 and at the top of the tower. The cooling fan 8 is used for starting to accelerate the flow rate of the chimney effect when the temperature of the energy storage system 5 is too high, so as to realize the dual combination of air cooling and natural cooling, thereby improving the heat dissipation performance.

[0096] As Figures 2 to 7 shown, the energy storage system 5 is located in the energy storage storage space 4 and is arranged on the support structure 6. As Figure 2As shown in the figure, an inner platform 9 at the top of the tower is fixedly installed in the upper part of the space formed by the inner wall 3 of the tower. Parallel inner platforms 10 of the tower are arranged in the middle and lower parts of the space formed by the inner wall 3 of the tower. A number of air holes 11 on the inner wall of the tower are arranged in the upper part of the inner wall 3 of the tower, and a number of air holes 12 under the inner wall of the tower are arranged in the middle of the inner wall 3 of the tower. Both the air holes 11 on the inner wall of the tower and the air holes 12 under the inner wall of the tower are communicated with the energy storage storage space 4. The air holes 11 on the inner wall of the tower are above the inner platform 9 at the top of the tower, and the air holes 12 under the inner wall of the tower are below the inner platform 9 at the top of the tower. The inner platform 9 at the top of the tower is an airtight flat plate; both the inner platform 10 of the tower and the support structure 6 are breathable grid flat plates, and the breathable grid flat plate is a structure body such as ordinary carbon steel, stainless steel or aluminum. The breathable grid flat plate refers to a plane with a certain porosity on a certain plane; on the one hand, it plays a role of a support structure and can prevent the energy storage system, and on the other hand, the fluid can flow through. In this embodiment, the height above the inner platform 9 at the top of the tower accounts for 1 / 3 of the overall height, and the height below the inner platform 9 at the top of the tower accounts for 2 / 3 of the overall height, which is beneficial to ensuring the stability of the overall structure.

[0097] With the above structure, during the chimney effect, the inner platform 9 at the top of the tower with an airtight flat plate can locally block the air flow, which is beneficial to the heat exchange between the chimney air flow and the energy storage system 5, thereby improving the heat dissipation effectiveness and reliability; while both the inner platform 10 of the tower and the support structure 6 are breathable grid flat plates, which can ensure the smoothness and stability of the chimney effect.

[0098] As Figure 8 shown, tower bottom ventilation openings 13 are provided at the bottoms of both the outer wall 2 and the inner wall 3 of the tower. Through the tower bottom ventilation openings 13, the mass and energy interaction between the inside and outside of the tower can be realized, and the chimney effect is formed upward to ensure the effectiveness and reliability of the upward air flow.

[0099] As Figure 2 shown, an inclined guide plate 14 arranged in a shape of an eight-character is fixedly installed between the bottom surface of the support structure 6 and the inner wall of the energy storage storage space 4, and the narrow end of the inclined guide plate 14 is fixedly installed on the bottom surface of the support structure 6. In this embodiment, the inclined guide plate is made of metal or composite material, and its inclination angle is 30° to 60°; the inner edge spacing of the inclined guide plate 14 is smaller than its outer edge spacing, forming a contraction diversion channel based on the Bernoulli equation, so that the fluid flowing through the energy storage storage space 4 has an increased flow velocity at the contraction section, thereby enhancing the heat exchange efficiency of the energy storage system 5. It is arranged in a shape of an eight-character, and its top opening is small. Due to the chimney effect, the air flow pressure from the top of the inclined guide plate 14 will increase, and the outlet end area is small, so that all the air flow can pass through the energy storage system 5, and the heat dissipation operation of the energy storage system 5 can be quickly realized, improving the heat dissipation effectiveness.

[0100] In this embodiment, the energy storage system 5 is a modular lithium battery or a modular electrochemical battery. Presented as a modular structure, it is distributed at different height positions, which is conducive to achieving energy conservation to a greater extent. Driven by the chimney effect, heat dissipation operation can be achieved to a greater extent.

[0101] The tower bottom vent 13 is used to introduce a cooling medium into the tower internal space surrounded by the tower inner wall 3 and the energy storage storage space 4 respectively, and cool the energy storage system 5 arranged at the bottom end of the tower through the cooling medium.

[0102] The first set of inclined guide plates 14 is used to accelerate the airflow of the heated cooling medium after passing through the energy storage system 5 at the bottom end of the tower.

[0103] The energy storage systems 5 arranged at the bottom end, middle part, and top end of the tower are staggered in the circumferential direction.

[0104] The airflow holes 11 on the tower inner wall and the airflow holes 12 under the tower inner wall are used to intersect the cooling medium in the tower internal space with the heated cooling medium in the energy storage storage space to form an intersecting cooling medium.

[0105] The second set of inclined guide plates 14 is also used to accelerate the intersecting cooling medium and then cool the energy storage system at the top end of the tower.

[0106] The nacelle vent 7 is used to discharge the intersecting cooling medium after heat exchange from the wind turbine.

[0107] The tower bottom vent 13 is used to close the tower bottom vent 13 in response to the control instruction of the controller when the current temperature of the energy storage system 5 is in the first preset temperature range; when the temperature of the energy storage system 5 is in the second preset temperature range, the opening degree of the tower bottom vent 13 is adjusted to a partially open state in response to the control instruction of the controller; when the temperature of the energy storage system 5 is in the third preset temperature range, the opening degree of the tower bottom vent 13 is adjusted to a fully open state in response to the control instruction of the controller; the first preset temperature range, the second preset temperature range, and the third preset temperature range increase in sequence.

[0108] The cooling fan 8 is used to turn on forced air cooling in response to the control instruction of the controller when the temperature of the energy storage system 5 is in the third preset temperature range, and accelerate the intersection of the cooling medium in the tower internal space and the heated cooling medium in the energy storage storage space and then transport it to the nacelle vent 7 to discharge the wind turbine.

[0109] The working principle of the embodiment of the present invention is as follows:

[0110] In the embodiment of the present invention, the chimney effect is maximally utilized to achieve natural cooling, and the temperature of the energy storage system at different heights of the tower barrel is controlled by combining with forced air cooling, thereby achieving energy saving synchronously. The cooling medium air first cools the energy storage system at the bottom end of the tower frame by opening the bottom of the outer wall of the tower frame. At this time, the heated cooling medium passes through the inclined guide plate to increase the air flow velocity, thereby increasing the convective heat transfer coefficient. Since the energy storage systems in the middle of the tower frame and the bottom energy storage system are staggered, the temperature of the energy storage system in the middle section of the tower frame can be well controlled.

[0111] Furthermore, through arranging through holes in the upper and middle sections of the inner wall of the tower frame, the cooling medium with a lower temperature inside the tower frame and the airflow with a higher temperature in the interlayer are intersected. At the same time, the airflow acceleration of the inclined guide plate at the top of the tower frame further increases the flow velocity before cooling the energy storage system at the top of the tower frame, thereby realizing the temperature control of the energy storage system at the top of the tower frame;

[0112] Furthermore, when the temperature is relatively high, the combination of forced air cooling and natural cooling is turned on. At this time, the airflow in the interlayer of the tower frame and the airflow inside the tower frame are integrated through the openings in the inner wall of the tower frame and are transported to the nacelle ventilation opening 7, and then discharged from the wind turbine.

[0113] The above technical solutions have the following beneficial technical effects:

[0114] 1. The structure of the present invention is reasonably arranged. There is an energy storage storage space 4 between the outer wall 2 of the tower frame and the inner wall 3 of the tower frame, and a number of parallel support structures 6 for supporting the energy storage system 5 are fixed in the energy storage storage space 4, so that the energy storage system 5 can be arranged between the outer wall 2 of the tower frame and the inner wall 3 of the tower frame and is supported by the support structure 6, integrating the tower frame and the energy storage system 5, which is beneficial to saving occupied space, reducing the land occupation cost, and also beneficial to improving the operation efficiency of the energy storage system 5;

[0115] 2. The top of the energy storage storage space 4 is connected to the nacelle ventilation opening 7. The cooling fan 8 is located at the top of the space formed by the inner wall 3 of the tower frame and, in cooperation with the air flow holes 11 on the inner wall of the tower frame, the air flow holes 12 under the inner wall of the tower frame and the ventilation opening 13 at the bottom of the tower frame, can achieve the chimney effect, which is beneficial to realizing the temperature control of the energy storage system 5, improving the heat dissipation and energy conduction performance, facilitating the release of a large amount of heat, and improving the saving effect;

[0116] 3. An inclined guide plate 14 arranged in a shape of an inverted V is fixed between the bottom surface of the support structure 6 and the inner wall of the energy storage storage space 4. Through the inclined guide plate 14, it is beneficial to accelerate the air flow and improve the efficiency of chimney heat dissipation;

[0117] 4. The inner platform 9 at the top of the tower is an airtight flat plate; the inner platform 10 and the support structure 6 inside the tower are both breathable grille flat plates, which can not only effectively support and position the inner wall 3 and the outer wall 2 of the tower, ensuring the stability and reliability of the entire structure during use, but also the inner platform 9 at the top of the tower is an airtight flat plate, which, in combination with other breathable grille flat plates, can ensure the effectiveness, stability and reliability of the chimney's heat dissipation;

[0118] 5. The number of energy storage systems 5 is multiple, and the energy storage systems 5 are arranged staggeredly in the circumferential direction. With the above structure, when the chimney dissipates heat, the energy storage systems 5 can be effectively and quickly cooled, which is beneficial to improving the stability and reliability of the use of the energy storage systems 5.

[0119] As Figures 9 to 11 shown, a control method for a novel wind turbine tower energy storage integrated system is provided. This method is based on the above-mentioned novel wind turbine tower energy storage integrated system, and the method includes the following steps:

[0120] Obtain the power generation power of the wind turbine, the grid load power, the current state of charge of the energy storage system, the current temperature of the energy storage system, and the power of the energy storage system;

[0121] According to the grid load power, the current state of charge of the energy storage system, and the current temperature of the energy storage system, determine whether the trigger condition for the discharge operation is met or whether the trigger condition for the charge operation is met;

[0122] When the start condition for the discharge operation is met, start the discharge operation of the energy storage system, and control the working process of the discharge operation according to the power generation power of the wind turbine, the power of the energy storage system, and the grid load power;

[0123] When the start condition for the charge operation is met, start the charge operation of the energy storage system, and control the working process of the charge operation according to the power generation power of the wind turbine, the grid load power, and the current state of charge of the energy storage system.

[0124] Furthermore, the method further includes:

[0125] When the temperature of the energy storage system is within the first preset temperature range, close the bottom ventilation openings of the outer wall and the inner wall of the tower;

[0126] When the temperature of the energy storage system is within the second preset temperature range, adjust the opening degree of the bottom ventilation opening of the tower to a partially open state;

[0127] When the temperature of the energy storage system is within the third preset temperature range, adjust the opening degree of the bottom ventilation opening of the tower to a fully open state and activate the forced cooling device; the forced cooling device includes a cooling fan;

[0128] Among them, the first preset temperature range, the second preset temperature range, and the third preset temperature range increase in sequence.

[0129] Furthermore, the method further includes:

[0130] When the temperature of the energy storage system reaches the first critical temperature value, reduce the charge-discharge rate of the energy storage system;

[0131] When the temperature of the energy storage system reaches the second critical temperature value, control the energy storage system to stop charging and discharging operations;

[0132] When the temperature of the energy storage system reaches the third critical temperature value, reduce the charging power of the energy storage system;

[0133] Among them, the third critical temperature value is less than the first critical temperature value, and the first critical temperature value is less than the second critical temperature value.

[0134] Furthermore, the triggering conditions for the discharging operation include:

[0135] The grid load power reaches or exceeds the first preset grid load threshold, and the first preset grid load threshold is the corresponding value of a high proportion of the grid load rated value;

[0136] The current state of charge of the energy storage system is greater than the first preset state of charge threshold;

[0137] The current temperature of the energy storage system is lower than the temperature safety threshold.

[0138] Furthermore, the triggering conditions for the charging operation include:

[0139] The grid load power reaches or is lower than the second preset grid load threshold, and the second preset grid load threshold is the corresponding value of a low proportion of the grid load rated value;

[0140] The current state of charge of the energy storage system is less than the second preset state of charge threshold;

[0141] The current temperature of the energy storage system is lower than the temperature safety threshold;

[0142] Among them, the second preset state of charge threshold is greater than the first preset state of charge threshold.

[0143] Furthermore, control the working process of the discharging operation according to the power generation power of the wind turbine, the power of the energy storage system, and the grid load power, specifically including:

[0144] Compare the relationship between the sum of the power of the wind turbine and the power of the energy storage system and the grid load power in real time;

[0145] When the sum of the powers is equal to the grid load power, maintain the current discharging power of the energy storage system;

[0146] When the sum of the powers exceeds the grid load power, reduce the discharge power of the energy storage system;

[0147] When the sum of the powers is lower than the grid load power, increase the discharge power of the energy storage system.

[0148] Furthermore, control the working process of the charging operation according to the power generation power of the wind turbine, the grid load power, and the current state of charge of the energy storage system, specifically including:

[0149] When the power of the wind turbine continuously exceeds the grid load power, maintain the current charging rate of the energy storage system;

[0150] When the power of the wind turbine approaches or equals the grid load power, reduce the charging rate of the energy storage system;

[0151] When it is detected that the state of charge of the energy storage system reaches the second preset state of charge threshold, terminate the charging operation and give feedback to the wind turbine.

[0152] Furthermore, the wind turbine realizes the dynamic matching of the power generation power and the grid load power through the pitch control mechanism and the variable speed control mechanism.

[0153] The following is a specific description:

[0154] As Figures 9 - 11 shown, when the temperature of the energy storage system 5 (corresponding to the battery in the figure) is less than or equal to the first temperature setting threshold, control the tower bottom ventilation openings 13 of the tower outer wall 2 and the tower inner wall 3 to close, that is, adjust the opening degree to 0%;

[0155] When the temperature of the energy storage system 5 is greater than the first temperature setting threshold and less than the second temperature setting threshold, control the opening degree of the tower bottom ventilation openings 13 of the tower outer wall 2 and the tower inner wall 3 to be adjusted to 50%, achieving a partially open state; the first temperature setting threshold is 10°C - 12°C. When the temperature is lower than 10°C, reduce the charging power to prevent the low temperature from affecting the battery activity. The value of the second temperature setting threshold is preferably 30°C.

[0156] When the temperature of the energy storage system 5 is greater than the second temperature setting threshold, control the tower bottom ventilation openings 13 of the tower outer wall 2 and the tower inner wall 3 to be fully open, that is, adjust the opening degree of the tower bottom ventilation openings to 100%, and at the same time turn on forced air cooling, that is, turn on the cooling fan 8, to achieve a dual cycle of air cooling and natural cooling.

[0157] As Figure 9 shown, where P wind is the power of the wind turbine, P storage is the energy storage power, P grid is the grid load power, T batteryis the battery temperature of the energy storage system.

[0158] The comparison and judgment conditions are as follows: when the grid load power is greater than 90% of the grid load rated value or reference value (P grid ≥90% grid load), the current remaining available power of the energy storage system 5 is greater than 10%, and the current temperature of the energy storage system 5 is less than 40°C, the energy storage system 5 actively discharges to provide power support for the grid;

[0159] Calculate the maximum discharge power of the energy storage system 5 and perform scheduling. The working process is as follows:

[0160] If P wind +P storage =P grid , then match the load;

[0161] If P wind +P storage >P grid , then reduce the discharge power of the energy storage system 5;

[0162] If P wind +P storage <P grid , then appropriately increase the discharge power of the energy storage system 5.

[0163] If the current temperature T of the energy storage system 5 ≥ 40°C, then reduce the discharge power of the energy storage system 5 to avoid overheating.

[0164] As Figure 10 shown, when the grid load power is less than or equal to 40% of the grid load rated value or reference value, and the current remaining available power SOC of the energy storage system 5 is less than 90%, and the temperature of the energy storage system 5 is less than 40°C, the wind turbine increases the power generation, and at the same time controls the energy storage system 5 to charge.

[0165] Calculate the maximum charge power of the energy storage system 5 and perform scheduling. The working process is as follows:

[0166] If P wind >P grid , then the energy storage system 5 charges;

[0167] If P wind ≤P grid , then reduce the charge power of the energy storage system 5;

[0168] If the SOC of the energy storage system 5 ≥ 90%, control the energy storage system 5 to stop charging, feedback the power data to the wind turbine, and adjust the power generation of the wind turbine;

[0169] If T battery≥40°, control and reduce the charging rate of the energy storage system 5 to avoid overheating and affecting the battery life.

[0170] The regulation of charging and discharging by temperature aims to avoid overheating damage to the battery caused by high temperature and improve the battery life in the energy storage system 5. The specific judgment conditions are as follows:

[0171] When T battery ≥40 °C, reduce the charging rate and the discharging rate;

[0172] When T battery ≥50 °C: Stop charging and discharging and enter the safety mode;

[0173] When T battery ≤10 °C, reduce the charging power to prevent low temperature from affecting the battery activity.

[0174] The corresponding control measures are to feedback to the wind turbine to adjust the power generation power of the wind turbine to avoid passive overcharging of the energy storage system 5; optimize the temperature control in combination with the cooling strategy of the energy storage system (such as natural air cooling by the chimney effect).

[0175] The working principle of the embodiment of the present invention is as follows:

[0176] The embodiment of the present invention makes the most of the chimney effect to achieve natural cooling, and controls the temperature of the energy storage system at different heights of the tower barrel by combining with forced air cooling, and synchronously realizes energy saving.

[0177] The cooling medium air first enters from the tower bottom vent at the bottom of the tower outer wall, and the energy storage system at the bottom end of the cooling tower is turned on. At this time, the heated cooling medium passes through the inclined deflector to increase the air flow velocity, thereby increasing the convective heat transfer coefficient. Since the energy storage systems in the middle of the tower are staggered with those at the bottom of the tower, the temperature of the energy storage systems in the middle of the tower can be well controlled.

[0178] By setting air flow holes (i.e., upper air flow holes and lower air flow holes) in the upper middle section of the tower inner wall, the lower temperature cooling medium inside the tower is intersected with the higher temperature air flow in the interlayer (the interlayer is formed between the tower outer wall 2 and the tower inner wall 3, corresponding to the above-mentioned energy storage storage space 4). At the same time, the air flow velocity is further increased by the air flow acceleration of the inclined deflector at the top of the tower before the energy storage system at the top of the cooling tower is turned on, and then the temperature control of the energy storage system at the top of the tower is realized;

[0179] When the temperature of the energy storage system is relatively high, turn on the combination of forced air cooling and natural cooling. At this time, the air flow in the tower interlayer and the air flow inside the tower are fused through the openings in the tower inner wall and transported to the cabin vent, and then discharged from the wind turbine.

[0180] The beneficial effects of the above technical solutions are as follows:

[0181] 1. A control method for a novel integrated system of a wind turbine tower and energy storage, the method steps are concise, and it can comprehensively consider factors such as the generator rate of the wind turbine, the grid load power, the state of charge of the energy storage system 5, and the temperature of the energy storage system 5. Furthermore, it can ensure that the energy storage system 5 is in the best state, and at the same time, it can also extend the service life of the energy storage system 5, with strong applicability;

[0182] 2. Through the temperature condition of the energy storage system 5, it realizes the adjustment of the opening state of the ventilation opening 13 at the bottom of the tower, and can achieve different heat dissipation methods according to different situations, thereby improving the overall heat dissipation effectiveness and stability reliability.

[0183] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "upper, lower, inner, and outer" is based on the orientation or positional relationship shown in the drawings. It 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 thus cannot be construed as a limitation to the present invention. In addition, the terms "first, second, or third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0184] Unless otherwise clearly defined and limited in the present invention, the terms "installed, connected, and coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can also be a mechanical connection, an electrical connection, or a direct connection, or can be indirectly connected through an intermediate medium, or can be the communication inside two elements. 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.

[0185] Although the present invention has been described with reference to the preferred embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A novel wind turbine tower energy storage integrated system, arranged at the bottom of a wind turbine cabin (1), characterized in that: It comprises a tower outer wall (2) and a tower inner wall (3), wherein an energy storage space (4) is provided between the tower outer wall (2) and the tower inner wall (3); A plurality of parallel supporting structures (6) for supporting the energy storage system (5) are fixed in the energy storage space (4); The wind turbine generator cabin (1) is provided with a cabin vent (7); The top of the energy storage space (4) is connected to the cabin vent (7), and the cooling fan (8) is located at the top of the space formed by the inner wall of the tower (3); The energy storage system (5) is located in the energy storage space (4) and is arranged on the support structure (6).

2. A novel wind turbine tower energy storage integrated system according to claim 1, characterized in that: A tower top inner platform (9) is fixed to the upper portion of the space formed by the tower inner wall (3), and parallel tower inner platforms (10) are arranged in the middle and lower portions of the space formed by the tower inner wall (3); A plurality of tower inner wall upper air flow holes (11) are arranged at the upper portion of the tower inner wall (3), and a plurality of tower inner wall lower air flow holes (12) are arranged at the middle portion of the tower inner wall (3); The air flow holes (11) on the inner wall of the tower and the air flow holes (12) on the inner wall of the tower are both connected to the energy storage space (4); The air flow holes (11) on the inner wall of the tower are located above the inner platform (9) at the top of the tower, and the air flow holes (12) on the lower inner wall of the tower are located below the inner platform (9) at the top of the tower.

3. A novel wind turbine tower energy storage integrated system according to claim 2, characterized in that: The bottoms of the tower outer wall (2) and the tower inner wall (3) are both provided with tower bottom vents (13).

4. The novel wind turbine tower energy storage integrated system according to claim 1 is characterized in that: An inclined guide plate (14) arranged in an eight-shaped shape is fixed between the bottom surface of the support structure (6) and the inner wall of the energy storage space (4), and the narrow end of the inclined guide plate (14) is fixed to the bottom surface of the support structure (6).

5. A novel wind turbine tower energy storage integrated system according to claim 2, characterized in that: The inner platform (9) at the top of the tower is a closed flat plate; The tower inner platform (10) and the supporting structure (6) are both air-permeable grid flat plates.

6. A novel wind turbine tower energy storage integrated system according to claim 1, characterized in that: The tower outer wall (2) and the tower inner wall (3) are both metal steel structures or concrete structures; the energy storage system (5) is a modular lithium battery or a modular electrochemical battery.

7. The novel wind turbine tower energy storage integrated system according to claim 1 is characterized by: The number of the energy storage systems (5) is plural, and the energy storage systems (5) are staggered in the circumferential direction; The novel wind turbine tower energy storage integrated system also includes a controller; The controller is connected to the wind vane anemometer, the energy storage system (5), the valve element provided on the vent (13) at the bottom of the tower, and the cooling fan (8); It is used to control the energy storage system (5), the opening of the valve element provided on the vent (13) at the bottom of the tower and the working state of the cooling fan (8).

8. The novel wind turbine tower energy storage integrated system according to claim 7 is characterized in that: The tower bottom vent (13) is used to introduce cooling medium into the tower internal space enclosed by the tower inner wall (3) and the energy storage space (4), respectively, so as to cool the energy storage system (5) arranged at the bottom of the tower by the cooling medium; The first group of inclined guide plates (14) are used to accelerate the airflow of the heated cooling medium after passing through the energy storage system (5) at the bottom end of the tower; The air flow holes (11) on the inner wall of the tower and the air flow holes (12) on the inner wall of the tower are used to merge the cooling medium in the inner space of the tower with the heated cooling medium in the energy storage space to form a merged cooling medium; The second group of inclined guide plates (14) are also used to accelerate the intersecting cooling medium to cool the energy storage system at the top of the tower; The cabin vent (7) is used to discharge the intersecting cooling medium after heat exchange out of the wind turbine set; The tower bottom vent (13) is used to respond to the control instruction of the controller and perform the following operations: when the current temperature of the energy storage system (5) is within a first preset temperature range, the tower bottom vent (13) is closed; when the temperature of the energy storage system (5) is within a second preset temperature range, the opening of the tower bottom vent (13) is adjusted to a partially open state; When the temperature of the energy storage system (5) is in a third preset temperature range, the opening of the vent (13) at the bottom of the tower is adjusted to a fully open state; the first preset temperature range, the second preset temperature range, and the third preset temperature range are increased in sequence; The cooling fan (8) is used to start forced air cooling in response to a control instruction of the controller when the temperature of the energy storage system (5) is within a third preset temperature range, so as to accelerate the cooling of the cooling medium in the interior space of the tower and the heated cooling medium in the energy storage space and then transport them to the cabin vent (7) to be discharged from the wind turbine set.

9. A novel control method for a wind turbine tower energy storage integrated system, characterized in that: The method is based on a novel wind turbine tower energy storage integrated system according to any one of claims 1 to 8, and the method comprises the following steps: Obtain the power generation power of the wind turbine, the power of the grid load, the current state of charge of the energy storage system, the current temperature of the energy storage system, and the power of the energy storage system; Determining whether a trigger condition for a discharge operation is met or whether a trigger condition for a charge operation is met according to the grid load power, the current state of charge of the energy storage system, and the current temperature of the energy storage system; When the start condition of the discharge operation is met, the discharge operation of the energy storage system is started, and the working process of the discharge operation is controlled according to the power generation power of the wind turbine set, the power of the energy storage system and the power of the grid load; When the starting conditions for the charging operation are met, the energy storage system charging operation is started, and the working process of the charging operation is controlled according to the generated power of the wind turbine set, the grid load power, and the current charge state of the energy storage system.

10. The control method according to claim 9, characterized in that: The method further comprises: When the temperature of the energy storage system is within a first preset temperature range, closing the bottom vents of the tower outer wall and the tower inner wall; When the temperature of the energy storage system is within a second preset temperature range, adjusting the opening of the vent at the bottom of the tower to a partially open state; When the temperature of the energy storage system is within a third preset temperature range, adjusting the opening of the vent at the bottom of the tower to a fully open state and activating a forced cooling device; Among them, the first preset temperature interval, the second preset temperature interval, and the third preset temperature interval increase in sequence.

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