阅读说明：本技术 储能装置、风力发电机组的储能系统及储能方法 (Energy storage device, energy storage system of wind generating set and energy storage method ) 是由 拜亮 刘岩 张才盛 许可歆 王�锋 于 2019-10-12 设计创作，主要内容包括：本发明涉及一种储能装置、风力发电机组的储能系统及储能方法,该储能装置包括：壳体,具有由壁部形成的容纳腔；储热构件,设置于容纳腔,储热构件包括储能本体和设置于储能本体内的传导件,传导件的一端从壁部伸出,并与外部能量装置电连接；储能本体设置有沿第一方向贯穿自身的多个传热孔道,传导件容纳于多个传热孔道内且相互连接。本发明通过设置于壳体内的储热构件来快速消耗外部能量装置的额外能量,并以热能的方式进行存储,有效地节约、利用能量,降低了风力发电机组的自耗电,有利于调节风力发电机组的发电功率。(The invention relates to an energy storage device, an energy storage system of a wind generating set and an energy storage method, wherein the energy storage device comprises: a housing having an accommodation chamber formed by a wall portion; the heat storage component is arranged in the accommodating cavity and comprises an energy storage body and a conducting piece arranged in the energy storage body, and one end of the conducting piece extends out of the wall part and is electrically connected with an external energy device; the energy storage body is provided with a plurality of heat transfer pore canals which penetrate through the energy storage body along a first direction, and the conduction pieces are accommodated in the plurality of heat transfer pore canals and are connected with each other. The invention quickly consumes the extra energy of the external energy device through the heat storage component arranged in the shell and stores the extra energy in a heat energy mode, thereby effectively saving and utilizing the energy, reducing the self-power consumption of the wind generating set and being beneficial to adjusting the generating power of the wind generating set.)

1. An energy storage device (1), comprising:

a housing (10) having an accommodation chamber (10a) formed by a wall portion;

the heat storage component (20) is arranged in the accommodating cavity (10a), the heat storage component (20) comprises an energy storage body (21) and a conducting piece (22) arranged in the energy storage body (21), and one end of the conducting piece (22) extends out of the wall part and is electrically connected with an external energy device; the energy storage body (21) is provided with a plurality of heat transfer pore canals (211) penetrating through the energy storage body along a first direction (X), and the conducting pieces (22) are accommodated in the plurality of heat transfer pore canals (211) and are connected with each other.

2. Energy storage device (1) according to claim 1, characterized in that said energy storage body (21) comprises a plurality of sub energy storage modules (21a) spliced to each other, each of said sub energy storage modules (21a) comprising said heat transfer duct (211) passing through itself along said first direction (X).

3. Energy storage device (1) according to claim 2, characterized in that each of said sub energy storage modules (21a) comprises a first pregroove (211a) running through itself in said first direction (X), said first pregroove (211a) being located at a corner of said sub energy storage module (21a), and said first pregroove (211a) of adjacent four of said sub energy storage modules (21a) forming said heat transfer duct (211).

4. Energy storage device (1) according to claim 3, characterized in that each of said sub energy storage modules (21a) further comprises a second pregroove (211b) running through itself in said first direction (X), said second pregroove (211b) being located at an edge of said sub energy storage module (21a), and said second pregroove (211b) of two adjacent sub energy storage modules (21a) forming said heat transfer duct (211).

5. Energy storage device (1) according to claim 3 or 4, characterized in that the energy storage body (21) is further provided with an air duct (212) extending through itself in a second direction (Y), the air duct (212) and the heat transfer duct (211) being arranged in a spaced apart manner, the second direction (Y) being arranged crosswise to the first direction (X).

6. The energy storage device (1) according to claim 5, further comprising a heat dissipation fan (30), wherein the wall portion of the housing (10) comprises a first wall (11) and a second wall (12) which are oppositely arranged along a second direction (Y), the first wall (11) is provided with an air outlet (111), the air outlet (111) is provided with a pipeline communicated with external equipment, and the heat dissipation fan (30) is arranged on the second wall (12) and is arranged corresponding to the ventilation channel (212).

7. Energy storage device (1) according to claim 1, characterized in that the energy storage body (21) is a square structure made of magnesium or an alloy containing magnesium.

8. The energy storage device (1) according to claim 1, wherein the heat storage member (20) further comprises a base (23) supporting the energy storage body (21), and the heat storage member (20) fixedly connects the energy storage body (21) and the base (23) into a whole through a compression device (24) and is fixed to the wall portion of the housing (10).

9. Energy storage device (1) according to claim 8, characterized in that the compression device (24) comprises a gland (241) and a fastening member (242) arranged on the gland (241), the gland (241) is pressed on the energy storage body (21), and the fastening member (242) is fixedly connected with the wall of the housing (10).

10. Energy storage device (1) according to claim 1, characterized in that the energy storage device (1) further comprises a temperature monitoring device and a controller electrically connected to the temperature monitoring device, the temperature monitoring device being provided in the housing (10) or in the energy storage body (21); a switch (25) is arranged between the conductor (22) and the energy device.

11. An energy storage system of a wind generating set, comprising:

a current transformer (2);

the energy storage device (1) as claimed in any of claims 1 to 10, a conductor (22) of the energy storage device (1) being electrically connected to the current transformer (2).

12. An energy storage method applied to the energy storage system of the wind generating set according to claim 11, characterized by comprising the following steps:

determining whether the converter (2) requires additional power consumption;

if yes, a switch (25) between the conduction piece (22) and the converter (2) is started through a controller, so that the energy storage device (1) is electrically connected with the converter (2);

if not, a switch (25) between the conduction piece (22) and the converter (2) is closed through a controller, so that the energy storage device (1) and the converter (2) are kept offline.

13. The energy storage method as claimed in claim 12, wherein after the controller activates the switch (25) between the conducting element (22) and the converter (2) to electrically connect the energy storage device (1) and the converter (2), the method further comprises:

-acquiring the temperature of the energy storage device (1) and comparing it with an allowable temperature threshold of the energy storage device (1):

if the temperature is greater than the permissible temperature threshold, a radiator fan (30) of the energy storage device (1) is activated by the controller.

Technical Field

The invention relates to the technical field of energy storage, in particular to an energy storage device, an energy storage system of a wind generating set and an energy storage method.

Background

The wind generating set converts wind energy into electric energy through a series of electric equipment such as a generator, a converter, a transformer and the like. Wind power plants include a large number of components, such as motors, electrical systems, lubrication systems, hydraulic systems, etc., which, while serving to generate electricity, themselves consume electrical energy.

Since the natural wind is variable, when the wind turbine works normally, the uncertainty of the wind condition causes the voltage generated by the generator to fluctuate, and the voltage fluctuation may cause damage to surge protectors and other parts on the generator. Therefore, the above electrical devices need to adjust the power generated in real time to meet the requirements of the unit life and the grid standard.

Disclosure of Invention

An object of the present invention is to provide an energy storage device, an energy storage system of a wind turbine generator system and an energy storage method, wherein the energy storage device can rapidly consume the extra energy of an external energy device and store the extra energy in a thermal energy manner.

On one hand, the embodiment of the invention also provides an energy storage device, which comprises: a housing having an accommodation chamber formed by a wall portion; the heat storage component is arranged in the accommodating cavity and comprises an energy storage body and a conducting piece arranged in the energy storage body, and one end of the conducting piece extends out of the wall part and is electrically connected with an external energy device; the energy storage body is provided with a plurality of heat transfer pore canals which penetrate through the energy storage body along a first direction, and the conduction pieces are accommodated in the plurality of heat transfer pore canals and are connected with each other.

According to one aspect of the embodiment of the invention, the energy storage body comprises a plurality of sub energy storage modules which are spliced with each other, and each sub energy storage module comprises a heat transfer pore canal which penetrates through the sub energy storage module along the first direction.

According to an aspect of an embodiment of the present invention, each of the sub energy storage modules includes a first pregroove extending therethrough in a first direction, the first pregroove being located at a corner of the sub energy storage module, and the first pregrooves of adjacent four sub energy storage modules form a heat transfer port.

According to an aspect of an embodiment of the present invention, each of the sub energy storage modules further includes a second pregroove extending therethrough in the first direction, the second pregroove being located at an edge of the sub energy storage module, and the second pregrooves of two adjacent sub energy storage modules form a heat transfer port.

According to an aspect of the embodiment of the present invention, the energy storage body is further provided with an air duct penetrating through the energy storage body along a second direction, the air duct and the heat transfer duct are arranged in a mutually isolated manner, and the second direction intersects with the first direction.

According to an aspect of the embodiment of the present invention, the energy storage device further includes a heat dissipation fan, the wall portion of the housing includes a first wall and a second wall that are disposed opposite to each other along the second direction, the first wall is provided with an air outlet, the air outlet is provided with a pipeline that communicates with an external device, and the heat dissipation fan is disposed on the second wall and corresponds to the air duct.

According to an aspect of an embodiment of the invention, the energy storage body is a square structure made of magnesium or an alloy comprising magnesium.

According to an aspect of the embodiment of the present invention, the heat storage member further includes a base supporting the energy storage body, and the heat storage member fixedly connects the energy storage body and the base into a whole through the pressing device and is fixed to a wall portion of the housing.

According to one aspect of the embodiment of the invention, the pressing device comprises a pressing cover and a fastening piece arranged on the pressing cover, the pressing cover is pressed on the energy storage body, and the fastening piece is fixedly connected with the wall part of the shell.

According to an aspect of an embodiment of the present invention, the energy storage device further includes a temperature monitoring device and a controller electrically connected to the temperature monitoring device, the temperature monitoring device is disposed in the housing or the energy storage body; a switch is arranged between the conduction piece and the energy device.

On the other hand, the embodiment of the invention also provides an energy storage system of a wind generating set, which comprises: the converter is electrically connected with a generator and a transformer of the wind generating set; as with the energy storage device described above, the conductive member of the energy storage device is electrically connected to the current transformer.

On the other hand, an embodiment of the present invention further provides an energy storage method applied to the energy storage system of the wind turbine generator set, where the energy storage method includes: determining whether the converter needs to perform additional power consumption; if yes, starting a switch between the conduction piece and the converter through the controller so as to electrically connect the energy storage device with the converter; if not, the switch between the conduction piece and the converter is closed through the controller, so that the energy storage device and the converter are kept offline.

According to an aspect of an embodiment of the present invention, after the controller activates the switch between the conductive member and the converter to electrically connect the energy storage device and the converter, the energy storage method further includes: obtaining a temperature of the energy storage device and comparing the temperature to an allowable temperature threshold of the energy storage device: if the temperature is greater than the allowable temperature threshold, a heat dissipation fan of the energy storage device is activated by the controller.

According to the energy storage device, the energy storage system and the energy storage method of the wind generating set, provided by the invention, the additional energy of the external energy device is quickly consumed through the heat storage component arranged in the shell, and is stored in a heat energy mode, and the energy storage device, the energy storage system and the energy storage method are simple in structure, energy-saving and environment-friendly. The energy storage device is applied to the wind generating set, so that the energy can be effectively saved and utilized, the self power consumption of the wind generating set is reduced, and the regulation of the generating power of the wind generating set is facilitated.

Drawings

Features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of an energy storage device according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of the energy storage device shown in FIG. 1;

FIG. 3 is a schematic view of a heat storage member of the energy storage device shown in FIG. 1;

FIG. 4 is a schematic view of a sub-thermal storage module of the thermal storage member shown in FIG. 3;

FIG. 5 is a schematic view of the heat storage body of the heat storage member shown in FIG. 3 along an angle;

FIG. 6 is a schematic view of the heat storage body of the heat storage member shown in FIG. 3 taken at another angle;

FIG. 7 is a block diagram of an energy storage system of a wind turbine generator system according to an embodiment of the present invention;

fig. 8 is a flowchart of an energy storage method of a wind turbine generator system according to an embodiment of the present invention.

Wherein:

1-an energy storage device; 2-a current transformer; 3, a generator; 4-a transformer; x-a first direction; y-a second direction;

10-a housing; 10 a-a containment chamber; 11-a first wall; 111-an air outlet; 12-a second wall; 13-third wall; 14-a fourth wall;

20-a heat storage member; 21-an energy storage body; 21 a-a sub energy storage module; 211 a-first pregroove; 211 b-second pregroove; 211-heat transfer channels; 22-a conductor; 212-air duct; 23-a base; 24-a compression device; 241-pressing cover; 242-a fastener; 25-a switch;

30-cooling fan.

Detailed Description

Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. In the drawings and the following description, at least some well-known structures and techniques have not been shown in detail in order to avoid unnecessarily obscuring the present invention; also, the dimensions of some of the structures may be exaggerated for clarity. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

The following description is given with reference to the orientation words as shown in the drawings, and is not intended to limit the specific structure of the present invention. In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.

For better understanding of the present invention, the energy storage device, the energy storage system of the wind turbine generator system and the energy storage method provided by the embodiment of the present invention are described in detail below with reference to fig. 1 to 8.

Referring to fig. 1 to 3, the present invention provides an energy storage device 1, which includes a housing 10 and a heat storage member 20.

The shell 10 is provided with an accommodating space 10a formed by wall parts, the heat storage member 20 is arranged in the accommodating space 10a, the heat storage member 20 comprises an energy storage body 21 and a conducting piece 22 arranged in the energy storage body 21, and one end of the conducting piece 22 extends out of the wall parts and is electrically connected with an external energy device; the energy storage body 21 is provided with a plurality of heat transfer tunnels 211 penetrating therethrough in the first direction X, and the conductive members 22 are accommodated in the plurality of heat transfer tunnels 211 and connected to each other.

Alternatively, the energy storage body 21 is an integral square component, and the conducting element 22 may be a conducting material capable of converting electricity into heat energy, such as a resistance wire or an electric heating rod, for heating the energy storage body 21. The conductive element 22 may be a single resistance wire received in the plurality of heat transfer passages 211, and as shown in fig. 3, the single resistance wire is wound back and forth in each heat transfer passage 211 to facilitate placement of a longer resistance wire in a small space. The conductor 22 may also be a plurality of resistance wires or electrically heated rods received in the plurality of heat transfer tunnels 211 and interconnected. In addition, the outer diameter of the conduction piece 22 is slightly smaller than the inner diameter of the heat transfer hole 211, so that the conduction piece 22 is conveniently installed in the heat transfer hole 211.

The external energy device can be, for example, a converter of a wind generating set, one end of the conducting piece 22 extends out of the wall part and is electrically connected with the converter, the other end of the conducting piece 22 is connected with the energy storage body 21, when current passes through the conducting piece, the conducting piece 22 can generate a heating effect, so that excessive electric energy of the converter can be consumed rapidly, the excessive electric energy is stored in the energy storage body 21 in a heat energy mode, the influence of a voltage peak value of the external energy device on an electric element can be reduced, and energy can be effectively saved and utilized.

The energy storage device provided by the invention can quickly consume the extra energy of the external energy device through the heat storage component arranged in the shell, and can store the extra energy in a heat energy mode, and the energy storage device is simple in structure, energy-saving and environment-friendly.

Referring to fig. 1 to 3 again, the energy storage body 21 of the heat storage member 20 may be a square structure made of magnesium or an alloy containing magnesium, and has high specific heat and high temperature resistance, can withstand a heat storage temperature up to 800 ℃, has a density of about 1/3 ℃ that of steel, and is easy to process.

When the energy stored in the energy storage device exceeds the self-bearing capacity, for example, the temperature of the energy storage body 21 exceeds the allowable maximum temperature of 800 ℃, the energy storage device needs to be dissipated in time.

Specifically, the energy storage body 21 is further provided with an air duct 212 penetrating through the energy storage body along the second direction Y, the second direction Y is intersected with the first direction X, and the air duct 212 and the heat transfer pore 211 are isolated from each other to avoid the phenomenon of short circuit of air flow in the heat exchange process and improve the heat dissipation effect of the energy storage device. Preferably, the second direction Y is perpendicular to the first direction X, which facilitates processing the energy storage body 21.

In order to further improve the heat dissipation effect of the energy storage device, the energy storage device further includes a heat dissipation fan 30, a wall portion of the housing 10 includes a first wall 11 and a second wall 12 that are oppositely disposed along the second direction Y, the first wall 11 is provided with an air outlet 111, the air outlet 111 is provided with a pipeline communicated with an external device, and the heat dissipation fan 30 is disposed on the second wall 12 and is disposed corresponding to the air duct 212. The heat dissipation fan 30 is disposed opposite to the air outlet 111, so as to prevent the air flow channel from turning and improve the heat dissipation effect.

The heat dissipation fan 30 includes a motor and a blade connected to the motor, and external cold air can be introduced into the energy storage body 21 through the ventilation duct 212 by the blade, so as to cool and dissipate the energy storage body 21 with too high temperature quickly and timely, thereby preventing the energy storage body 21 from being damaged due to cracks caused by overheating. And because the air duct 212 and the heat transfer pore passage 211 are arranged in an isolated manner, the external cold air cannot directly contact the conduction piece 22, the accelerated oxidation of the conduction piece 22 such as a resistance wire is avoided, and the service life of the conduction piece 22 is prolonged.

In addition, the air outlet 111 is provided with a pipeline communicated with external equipment, and the external equipment can be, for example, an electric control cabinet of the wind generating set needing dehumidification, a hydraulic station needing to heat hydraulic oil in winter and equipment needing to heat lubricating oil, so that energy consumed quickly can be stored in a form of heat energy, and released when needed to complete dehumidification of the electric control cabinet, temperature increase of a cabin in winter and the like, and the purpose of reducing self-power consumption of the wind generating set is achieved.

Further, a self-hanging type ventilation curtain is disposed at the air outlet 111 of the housing 10, and a common self-hanging type ventilation curtain may be a louver, so as to form a normally closed channel. When the energy storage device needs to store energy, the self-hanging ventilation curtain at the heat dissipation fan 30 and the air outlet 111 is closed, so that heat exchange between the energy storage body 21 and the outside is reduced as much as possible. If the excess heat energy needs to be consumed, the heat energy can be communicated with external equipment through a pipeline at the air outlet 111. When the energy stored in the energy storage device reaches the bearing capacity and cannot be consumed quickly in time, the self-hanging vent curtain of the air outlet 111 can be opened, and heat is dissipated in time through the heat dissipation fan 30, so that the flexibility of temperature adjustment of the energy storage device is improved.

Referring to fig. 4 to 6, optionally, the energy storage body 21 includes a plurality of sub energy storage modules 21a spliced with each other, and further optionally, each sub energy storage module 21a is a square structural block.

In some embodiments, each sub energy storage module 21a includes a heat transfer port 211 extending therethrough along the first direction X, and the conductive members 22 are received in the plurality of heat transfer ports 211 and connected to each other.

In some embodiments, each of the sub energy storage modules 21a includes a first pre-groove 211a penetrating therethrough in the first direction X, the first pre-groove 211a being located at a corner of the sub energy storage module 21a, and the first pre-grooves 211a of adjacent four sub energy storage modules 21a form a heat transfer hole 211, and the conductive members 22 are received in the plurality of heat transfer hole 211 and connected to each other.

In some embodiments, each sub energy storage module 21a further includes a second pre-groove 211b penetrating itself in the first direction X, the second pre-groove 211b being located at an edge of the sub energy storage module 21a, and the second pre-grooves 211b of two adjacent sub energy storage modules 21a form a heat transfer hole 211, and the conductive members 22 are received in the plurality of heat transfer hole 211 and connected to each other.

Further, each sub energy storage module 21a further includes an air duct 212 penetrating itself in the second direction Y, and the air duct 212 is disposed to be spaced apart from the first pre-groove 211a and the second pre-groove 211 b.

As shown in fig. 3 and 4, the energy storage body 21 includes 48 sub energy storage modules 21a that are spliced with each other, each sub energy storage module 21a is a square structural block, the 48 sub energy storage modules 21a are spliced into 4 layers, each layer has a cubic structure with 3 rows and 4 columns of sub energy storage modules 21a, four corners of each sub energy storage module 21a are respectively provided with a first prefabricated groove 211a that penetrates through itself along the first direction X, and the first prefabricated grooves 211a of the 48 sub energy storage modules 21a form 6 heat transfer pore canals 211 in a conformal manner. In addition, a second prefabricated groove 211b penetrating through each of the energy storage sub-modules 21a along the first direction X is respectively arranged at the upper edge and the lower edge of each energy storage sub-module 21a, and the second prefabricated grooves 211b of 48 energy storage sub-modules 21a form 9 heat transfer pore canals 211; the entire conductor 22 is wound back and forth within the 15 heat transfer portholes 211 formed by the first pregroove 211a and the second pregroove 211 b. In addition, each sub energy storage module 21a further includes 2 ventilation ducts 212 penetrating itself in the second direction Y, the 2 ventilation ducts 212 being provided separately from the first pre-groove 211a and the second pre-groove 211b, and a total of 32 ventilation ducts 212 being formed in 48 sub energy storage modules 21 a.

Thus, the plurality of sub energy storage modules 21a are spliced together to have a cubic shape, so that the plurality of heat transfer hole passages 211 of the energy storage body 21 can be formed by splicing together the plurality of first pre-grooves 211a and the plurality of second pre-grooves 211b to accommodate the conductive members 22; meanwhile, the heat dissipation fan 30 is disposed corresponding to both ends of the plurality of air channels 212 to improve the heat dissipation effect of the energy storage device. The energy storage body 21 of not equidimension volume can be spliced wantonly according to the user demand to a plurality of sub energy storage modules 21a of modular design, the total volume of sub energy storage module 21 a's quantity or single energy storage body 21 is directly proportional with the total length of conduction piece 22, the length and the power consumption ability of conduction piece 22 are directly proportional, more sub energy storage modules 21a mean simultaneously can save more heats, the extension is convenient, sub energy storage module 21 a's commonality and flexibility have been improved, satisfy the energy storage demand of wind power plant level, also be convenient for inventory management.

Referring to fig. 2 again, the heat storage member 20 further includes a base 23 supporting the energy storage body 21, the base 23 mainly plays a role of insulation and heat insulation, and the material of the base may be, for example, high temperature resistant nylon or other plastics, or a metal plate wrapped with a temperature resistant layer such as nylon or other temperature resistant layers. The heat storage member 20 is fixedly connected with the energy storage body 21 and the base 23 into a whole through the pressing device 24 and is fixed on the wall part of the shell 10, so that the heat storage member 20 is prevented from moving in the shell 10 due to bumping or vibration and further damaging the energy storage body 21.

Specifically, the pressing device 24 includes a pressing cover 241 and a fastening member 242 disposed on the pressing cover 241, the pressing cover 241 is pressed on the energy storage body 21, and the fastening member is fixedly connected with the wall of the housing 10. The fastening member 242 may be a bolt having an external thread, the wall of the housing 10 is provided with an internal threaded hole, and the pressing device 24 is used for adjusting the distance between the housing 10 and the heat storage member 20 by the threaded connection between the fastening member 242 and the internal threaded hole of the wall, thereby pressing or releasing the heat storage member 20.

Further, the wall portion of the housing 10 further includes a third wall 13 and a fourth wall 14 disposed opposite to each other in the first direction X, one end of the conductive member 22 protrudes from the third wall 13, and a predetermined gap is maintained between the energy storage body 21 and the third wall 13 and the fourth wall 14. The predetermined gap may be, for example, 200mm to allow air flow inside the housing 10 to prevent the conductive element 22 from failing and energizing the housing 10.

The material of the housing 10 is preferably a metal material, and has a certain structural strength. Optionally, the outer surface of the housing 10 is provided with a layer of insulation to minimize heat transfer between the interior and exterior of the housing 10. The material of the heat insulation layer is usually non-metallic foam, which can also have the effect of insulation.

In addition, the energy storage device 1 further includes a temperature monitoring device (not shown in the figure) and a controller (not shown in the figure) electrically connected to the temperature monitoring device, and the temperature monitoring device may be disposed in the housing 10 or the energy storage body 21 to monitor the temperature of the energy storage body 21 in real time, and the controller starts or closes the cooling fan 30 according to the monitored temperature, so as to implement automatic control.

In order to more effectively control the energy storage device 1, a switch 25 is disposed between the conducting element 22 of the heat storage member 20 and the external energy device, and the switch 25 can cut off the transmission of electric energy through the controller, and only generates heat when necessary, so that the start and the stop of the energy storage device 1 can be controlled according to whether the external energy device needs to perform extra power consumption.

Referring to fig. 7, the invention further provides an energy storage system of a wind generating set, which includes any one of the energy storage devices 1 and the current transformer 2, wherein the conductive member 22 of the energy storage device 1 is electrically connected with the current transformer 2.

The converter 2 is used as an important component of the wind generating set, and the function of the converter in the operation process of the wind generating set is very important. When the wind generating set is in normal operation, the generated voltage of the generator 3 may fluctuate due to uncertainty of wind conditions, and the voltage fluctuation may cause damage to the surge protector and other parts on the generator 3.

Optionally, the energy storage device 1 is placed in the vicinity of power elements of the converter 2, such as a rectifier and/or an inverter. One end of a conducting piece 22 of the energy storage device 1 extends out of the wall part and is electrically connected with the converter 2, the other end of the conducting piece is connected with the energy storage body 21, excessive electric energy of the converter can be consumed rapidly, and the excessive electric energy is stored in the energy storage body 21 in a heat energy mode, so that the influence of a voltage peak value on a surge protector and other parts can be reduced, energy can be effectively saved, and the regulation of the generating power of the wind generating set is facilitated.

The energy storage system of the wind generating set provided by the invention adopts any one of the energy storage devices 1, so that the energy can be effectively saved and utilized, the self-power consumption of the wind generating set is reduced, and the adjustment of the generating power of the wind generating set is facilitated.

Referring to fig. 8, the present invention further provides an energy storage method applied to the energy storage system of the wind turbine generator set, where the energy storage method mainly includes two control portions: the energy storage is a heat portion and a heat consuming portion.

Specifically, the energy storage method comprises the following steps:

step S1: it is determined whether the converter 2 needs to perform additional power consumption. The information can be obtained from the control system of the wind generating set itself whether the converter 2 needs to perform extra power consumption, for example, the generating voltage of the generator 3 is too high due to sudden change of wind conditions, or a large amount of useless power needs to be consumed when the wind generating set performs low voltage ride through, and the like.

Step S21: if so, a switch 25 between the conductor 22 and the converter 2 is activated by the controller to electrically connect the energy storage device 1 with the converter 2. The energy storage device 1 is connected as a power consumer for power consumption.

Step S22: if not, the switch 25 between the conductor 22 and the converter 2 is closed by the controller to keep the energy storage device 1 off-line from the converter 2. The energy storage device 1 is kept off line and is not connected with a power generation system of the wind generating set.

Further, after the controller activates the switch 25 between the conductor 22 and the converter 2 to electrically connect the energy storage device 1 and the converter 2 in step S21, the energy storage method further includes:

step S3: the temperature of the energy storage device 1 is acquired and compared with an allowable temperature threshold of the energy storage device 1:

step S4: if the temperature is greater than the allowable temperature threshold, the heat dissipation fan 30 of the energy storage device 1 is activated by the controller.

If the temperature is not greater than the allowable temperature threshold, it is possible to reserve electric energy at the time of low demand for electric power in the power grid at night as thermal energy, for example, to provide heating for the residents in winter, or to provide services for production processes requiring heating in nearby plants, for example, depending on whether the stored heat needs to be utilized or not.

According to the energy storage method of the wind generating set, provided by the invention, when the extra energy generated by the converter 2 needs to be consumed, the energy generated by the converter 2 can be quickly consumed through the energy storage device 1, and meanwhile, the consumed energy can be stored and used in a heat mode when needed, so that the energy is effectively saved and utilized.

While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.