Doubly-fed generator

Abstract

The invention discloses a doubly-fed generator, and relates to the technical field of wind power generation, the doubly-fed generator comprises a generator body and a cooling system, the cooling system comprises a first flexible heat conduction piece, a water pump and a heat dissipation assembly, the first flexible heat conduction piece is arranged on the periphery of the generator body in a surrounding mode, a first honeycomb-shaped pipeline is formed in the first flexible heat conduction piece, the water inlet end of the water pump can communicate with the first water outlet pipe, and the heat dissipation assembly is connected with the first water outlet pipe; the water outlet end of the water pump communicates with the first water inlet pipe; the water pump is used for driving cooling liquid to flow in the first honeycomb-shaped pipeline, the first water inlet pipe and the first water outlet pipe. The first honeycomb-shaped pipeline greatly increases the amount of the cooling liquid for heat exchange with the generator body, improves the heat exchange efficiency and heat exchange effect of the generator body, effectively reduces the temperature of the generator body, and prolongs the service life of the doubly-fed generator.

Description

Technical Field

[0001] This invention relates to the field of wind power generation technology, and in particular to a doubly-fed generator. Background Technology

[0002] Doubly fed generators (DFGs) are the core components of wind turbine generators, responsible for converting the mechanical energy captured by the wind turbine into electrical energy. They are the "heart" of variable-speed constant-frequency wind power generation systems. Their core function is to efficiently convert the mechanical energy transmitted by the wind turbine through the speed increaser into electrical energy and feed it into the power grid. At the same time, they have variable-speed constant-frequency characteristics to adapt to changes in wind speed and achieve maximum wind energy capture.

[0003] However, existing doubly-fed generators often experience generator failures during use, forcing them to undergo major repairs or replacements, making it difficult to guarantee the service life of the doubly-fed generators. Summary of the Invention

[0004] The main objective of this invention is to propose a doubly-fed generator, aiming to solve the technical problem of how to improve the service life of a doubly-fed generator.

[0005] To achieve the above objectives, the present invention proposes a doubly-fed generator, comprising: Generator body; A cooling system includes a first flexible heat-conducting element, a water pump, and a heat dissipation assembly. The first flexible heat-conducting element surrounds the generator body and forms a first honeycomb-shaped pipeline inside. The first honeycomb-shaped pipeline includes multiple interconnected and arrayed first polygonal heat-conducting pipes. The first flexible heat-conducting element includes a first end and a second end disposed opposite to each other. The first end has at least one first polygonal heat-conducting pipe connected to a first water inlet pipe, and the second end has at least one first polygonal heat-conducting pipe connected to a first water outlet pipe. The water inlet end of the water pump can be connected to the first water outlet pipe, and the heat dissipation assembly is connected to the first water outlet pipe. The water outlet end of the water pump is connected to the first water inlet pipe. The water pump is used to drive the coolant to flow in the first honeycomb-shaped pipeline, the first water inlet pipe, and the first water outlet pipe.

[0006] In one embodiment, the heat dissipation assembly includes a heat dissipation body and a second flexible heat conductor. One side of the heat dissipation body is connected to the second flexible heat conductor. The interior of the second flexible heat conductor forms a second honeycomb-shaped pipeline. The second honeycomb-shaped pipeline includes a plurality of interconnected and arrayed second polygonal heat conductors. The second flexible heat conductor includes a third end and a fourth end disposed opposite to each other. The first water outlet pipe includes a first pipeline and a second pipeline. One end of the first pipeline is connected to at least one of the first polygonal heat conductors at the second end, and the other end of the first pipeline is connected to at least one of the second polygonal heat conductors at the third end. One end of the second pipeline is connected to at least one of the second polygonal heat conductors at the fourth end, and the other end of the second pipeline is connected to the water inlet of the water pump.

[0007] In one embodiment, the heat dissipation body includes a heat dissipation plate and heat dissipation fins, one side of the heat dissipation plate is attached to the second flexible heat-conducting element, and the other side of the heat dissipation plate is connected to the heat dissipation fins.

[0008] In one embodiment, the number of heat dissipation fins is multiple, and the multiple heat dissipation fins are arranged at intervals.

[0009] In one embodiment, the heat dissipation assembly further includes a driver and a fan, the driver being tractively connected to the fan and used to drive the fan to rotate, with the fan's exhaust side facing the heat dissipation fins.

[0010] In one embodiment, the driving component is a motor, and the fan is mounted on the rotating shaft of the motor so that the motor can drive the fan to rotate.

[0011] In one embodiment, the doubly-fed generator further includes a water tank, a heating element, and a three-way solenoid valve. The heating element is disposed in the water tank, which is used to contain coolant. The three-way solenoid valve includes a first port, a second port, and a third port. The first pipeline includes a first section and a second section. One end of the first section is connected to at least one first polygonal heat-conducting pipe at the second end, and the other end of the first section is connected to the first port. One end of the second section is connected to the second port, and the other end of the second section is connected to at least one second polygonal heat-conducting pipe at the third end. The third port is connected to the water inlet of the water tank through a second inlet pipe, and the water outlet of the water tank is connected to the second pipeline through a second outlet pipe.

[0012] In one embodiment, the doubly fed generator further includes a control module and a temperature sensor. The temperature sensor is used to detect the temperature of the lubricating grease inside the generator body. The temperature sensor, the water pump, the heating element, and the three-way solenoid valve are all communicatively connected to the temperature sensor.

[0013] In one embodiment, the doubly fed generator further includes a first one-way valve, which is disposed on the second outlet pipe. The first one-way valve allows the coolant in the water tank to flow sequentially through the second outlet pipe and the second pipeline before flowing into the inlet of the water pump.

[0014] In one embodiment, the first water outlet pipe can also be connected to the inner wall of the nacelle of the wind turbine generator set.

[0015] The technical solution of this invention employs a first flexible heat-conducting element surrounding the outer wall of the generator body, thereby increasing the contact area between the first flexible heat-conducting element and the generator body, which is beneficial for heat exchange. The interior of the first heat-conducting element forms a first honeycomb-shaped pipeline, which is composed of multiple interconnected and arrayed first polygonal heat-conducting pipes. This greatly increases the amount of coolant exchanging heat with the generator body, improving the heat exchange efficiency and effect. The coolant that has completed heat exchange with the generator body flows into the first outlet pipe through at least one first polygonal heat-conducting pipe at the second end. Since the heat dissipation component is connected to the first outlet pipe, the coolant in the first outlet pipe exchanges heat with the heat dissipation component again when passing through it, thus lowering the coolant temperature. The cooled coolant then enters the inlet of the water pump through the first outlet pipe. Under the action of the water pump, the coolant then enters the at least one first polygonal heat-conducting pipe at the first end through the first inlet pipe from the outlet of the water pump. This process repeats, effectively reducing the temperature of the generator body and extending the service life of the doubly-fed generator. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a doubly-fed generator embodiment provided by the present invention; Figure 2 This is a schematic diagram of a first honeycomb pipeline embodiment provided by the present invention; Figure 3 A schematic diagram of an embodiment of the coolant flowing in the first honeycomb pipe section structure provided by the present invention; Figure 4 This is a schematic diagram of a structure of a heat dissipation component according to an embodiment of the present invention.

[0018] Explanation of icon numbers: 100. Doubly fed generator; 1. Generator body; 2. Cooling system; 21. First flexible heat-conducting component; 211. First honeycomb pipe; 2111. First polygonal heat-conducting pipe; 212. First end; 213. Second end; 22. Water pump; 23. Heat dissipation assembly; 231. Heat dissipation body; 2311. Heat dissipation plate; 2312. Heat dissipation fins; 232. Second flexible heat-conducting component; 233. Drive component; 234. Fan; 3. First water inlet pipe; 4. First water outlet pipe; 41. First pipeline; 411. First section; 412. Second section; 42. Second pipeline; 5. Water tank; 6. Heating component; 7. Three-way solenoid valve; 71. First port; 72. Second port; 73. Third port; 8. Temperature sensor; 91. First check valve; 92. Second check valve; 20. Second water outlet pipe; 30. Second water inlet pipe.

[0019] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0022] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0023] Doubly fed generators (DFGs) are the core components of wind turbine generators, responsible for converting the mechanical energy captured by the wind turbine into electrical energy. They are the "heart" of variable-speed constant-frequency wind power generation systems. Their core function is to efficiently convert the mechanical energy transmitted by the wind turbine through the speed increaser into electrical energy and feed it into the power grid. At the same time, they have variable-speed constant-frequency characteristics to adapt to changes in wind speed and achieve maximum wind energy capture.

[0024] However, existing doubly-fed generators often experience generator failures during use, forcing them to undergo major repairs or replacements, making it difficult to guarantee the service life of the doubly-fed generators.

[0025] The inventors discovered that doubly-fed generators generate a large amount of heat during operation. If this heat cannot be dissipated in time, it can lead to aging or even breakdown of the insulation system, damage to the stator or rotor windings, and thus have a significant impact on the lifespan of the doubly-fed generator.

[0026] This invention proposes a doubly-fed generator, aiming to solve the technical problem of how to improve the service life of doubly-fed generators.

[0027] Please see Figures 1 to 3 In one embodiment of the present invention, the doubly-fed generator 100 includes a generator body 1 and a cooling system 2. The cooling system 2 includes a first flexible heat-conducting element 21, a water pump 22, and a heat dissipation assembly 23. The first flexible heat-conducting element 21 surrounds the generator body 1, and a first honeycomb-shaped pipeline 211 is formed inside the first flexible heat-conducting element 21. The first honeycomb-shaped pipeline 211 includes a plurality of interconnected and arrayed first polygonal heat-conducting pipes 2111. The first flexible heat-conducting element 21 includes a first end 2 disposed opposite to the first end 2. 12 and the second end 213, the first end 212 has at least one first polygonal heat conduction pipe 2111 connected to the first water inlet pipe 3, the second end 213 has at least one first polygonal heat conduction pipe 2111 connected to the first water outlet pipe 4; the water inlet end of the water pump 22 can be connected to the first water outlet pipe 4, the heat dissipation component 23 is connected to the first water outlet pipe 4; the water outlet end of the water pump 22 is connected to the first water inlet pipe 3; the water pump 22 is used to drive the coolant to flow in the first honeycomb pipe 211, the first water inlet pipe 3 and the first water outlet pipe 4.

[0028] The technical solution of this invention employs a first flexible heat-conducting element 21 surrounding the outer wall of the generator body 1. Since the first flexible heat-conducting element 21 is made of a flexible material, it is easy to bend, thus adapting to the uneven installation environment of the generator body's outer wall. This increases the contact area between the first flexible heat-conducting element 21 and the generator body 1, which is beneficial for improving heat exchange efficiency and ensuring the longevity of the doubly-fed generator 100. The interior of the first heat-conducting element forms a first honeycomb-shaped pipeline 211, which is composed of multiple interconnected and arrayed first polygonal heat-conducting pipes 2111. Compared to pipelines arranged in an S-shaped bend, in this embodiment, the first honeycomb-shaped pipeline 211, with the same pipe diameter as the S-shaped bend pipeline, allows more coolant to exchange heat with the generator body 1 simultaneously, greatly enhancing the heat exchange efficiency with the generator body. The amount of coolant used for heat exchange increases the heat exchange efficiency and effect on the generator body 1. The temperature of the coolant that has completed heat exchange with the generator body 1 rises and flows into the first outlet pipe 4 through at least one first polygonal heat conduction pipe 2111 at the second end 213. It is transported through the first outlet pipe 4. Since the heat dissipation component 23 is connected to the first outlet pipe 4, the coolant in the first outlet pipe 4 will exchange heat with the heat dissipation component 23 again when it passes through the heat dissipation component 23, thereby reducing the temperature of the coolant. The cooled coolant still enters the inlet end of the water pump 22 through the first outlet pipe 4. Under the action of the water pump 22, the coolant enters the at least one first polygonal heat conduction pipe 2111 at the first end 212 through the first inlet pipe 3 from the outlet end of the water pump 22, and then flows to the polygonal heat conduction pipe at the second end 213. This process is repeated, thereby effectively reducing the temperature of the generator body 1 and improving the service life of the doubly-fed generator 100. The first flexible heat-conducting component 21 can be a silicone heat-conducting pad, a graphite heat-conducting pad, a foam heat-conducting pad, etc., and there are no restrictions on it; the coolant can be water, antifreeze, etc., and there are no restrictions on it.

[0029] Please see Figure 1 and Figure 4In one embodiment, the heat dissipation assembly 23 includes a heat dissipation body 231 and a second flexible heat conductor 232. One side of the heat dissipation body 231 is connected to the second flexible heat conductor 232. The interior of the second flexible heat conductor 232 forms a second honeycomb-shaped pipeline. The second honeycomb-shaped pipeline includes a plurality of interconnected and arrayed second polygonal heat conductors. The second flexible heat conductor 232 includes a third end and a fourth end that are disposed opposite to each other. The first water outlet pipe 4 includes a first pipe 41 and a second pipe 42. One end of the first pipe 41 is connected to at least one first polygonal heat conductor 2111 of the second end 213, and the other end of the first pipe 41 is connected to at least one second polygonal heat conductor of the third end. One end of the second pipe 42 is connected to at least one second polygonal heat conductor of the fourth end, and the other end of the second pipe 42 is connected to the water inlet of the water pump 22. The second flexible heat-conducting element 232 is connected to the heat dissipation body 231. Compared to the S-shaped arrangement of pipes on one side of the heat dissipation body 231, the second flexible heat-conducting element 232 can fully fit against one side of the heat dissipation body 231, thereby increasing the connection area and effectively improving heat exchange efficiency and effect. Simultaneously, combined with the second honeycomb pipe network, it effectively increases the amount of coolant exchanging heat with the heat dissipation body 231 per unit time, helping the coolant to quickly transfer heat to the heat dissipation body 231 for dissipation, thus effectively reducing the coolant temperature and ensuring effective heat reduction of the generator body 1. The second flexible heat-conducting element 232 can be a silicone thermal pad, graphite thermal pad, foam thermal pad, etc., and is not limited here.

[0030] Please see Figure 1 and Figure 4 In one embodiment, the heat dissipation body 231 includes a heat dissipation plate 2311 and heat dissipation fins 2312. One side of the heat dissipation plate 2311 is attached to the second flexible heat-conducting element 232, and the other side of the heat dissipation plate 2311 is connected to the heat dissipation fins 2312. By providing heat dissipation fins 2312, the contact area between the heat dissipation body 231 and the air is increased, thereby improving the heat exchange rate with the air and helping to better reduce the temperature of the coolant in the second honeycomb pipe.

[0031] Please see Figure 1 and Figure 4 In one embodiment, there are multiple heat dissipation fins 2312, which are spaced apart. By providing multiple heat dissipation fins 2312, the contact area between the heat dissipation body 231 and the air is further increased, the heat exchange rate with the air is improved, and it helps to better reduce the temperature of the coolant in the second honeycomb pipe.

[0032] Please see Figures 1 to 3In one embodiment, the heat dissipation assembly 23 further includes a drive member 233 and a fan 234. The drive member 233 is tractively connected to the fan 234, and the drive member 233 drives the fan 234 to rotate. The air outlet side of the fan 234 is positioned facing the heat dissipation fins 2312. By adding the drive member 233 and the fan 234, the fan 234 is driven by the drive member 233 to rotate, thereby accelerating the airflow around the heat dissipation fins 2312, improving the heat exchange effect between the heat dissipation body 231 and the air, and helping to better reduce the temperature of the coolant in the second honeycomb pipe.

[0033] In one embodiment, the drive component 233 is a motor, and the fan 234 is mounted on the rotating shaft of the motor so that the motor can drive the fan 234 to rotate. The drive component 233 can be a stepper motor or a servo motor, and there is no limitation thereto. The rotating shaft of the motor directly drives the fan 234 to rotate, thereby accelerating the airflow around the heat sink 2312, improving the heat exchange effect between the heat sink 231 and the air, and helping to better reduce the temperature of the coolant in the second honeycomb pipe.

[0034] Please see Figures 1 to 3 In one embodiment, the doubly-fed generator 100 further includes a water tank 5, a heating element 6, and a three-way solenoid valve 7. The heating element 6 is disposed in the water tank 5, which is used to contain coolant. The three-way solenoid valve 7 includes a first port 71, a second port 72, and a third port 73. The first pipeline 41 includes a first section 411 and a second section 412. One end of the first section 411 is connected to at least one first polygonal heat-conducting pipe 2111 of the second end 213, and the other end of the first section 411 is connected to the first port 71. One end of the second section 412 is connected to the second port 72, and the other end of the second section 412 is connected to at least one second polygonal heat-conducting pipe of the third end. The third port 73 is connected to the inlet end of the water tank 5 through a second inlet pipe 30, and the outlet end of the water tank 5 is connected to the second pipeline 42 through a second outlet pipe 20.

[0035] The inventors discovered that in cold winters, such as in northern regions, the lowest temperature in some areas can drop below -25 degrees Celsius. The applicable temperature range for conventional lubricating grease is generally between -20 and 120 degrees Celsius. If the lubricating oil temperature drops below -20 degrees Celsius, the grease will solidify, its viscosity will increase sharply, its fluidity will decrease, and it will be unable to form an effective oil film. This will cause "dry friction" between the bearing balls and raceways. Increased frictional resistance will lead to abnormally high bearing temperature, accelerated wear, increased abnormal noise, and ultimately, seizure. If the rotor shaft of the doubly-fed generator 100 becomes eccentric due to bearing seizure, it may cause "rotor scraping" (rotor scraping the stator), directly destroying the mechanical structure and severely affecting the service life of the doubly-fed generator 100.

[0036] In this embodiment, a heating element 6 is added inside the water tank 5 to raise the temperature of the coolant inside. A three-way solenoid valve 7 is used to control whether the coolant flows out from the second port 72 or the third port 73 after entering the first port 71. When the grease temperature is lower than a preset temperature (typically -10 degrees Celsius), the three-way solenoid valve 7 connects the first port 71 and the third port 73. The coolant in the first section 411 enters the second inlet pipe 30 through the three-way solenoid valve 7, and then enters the water tank 5 through the second inlet pipe 30 to be heated by the heating element 6. The heated coolant then enters the second pipeline 42 through the second outlet pipe 20, and then enters the inlet of the water pump 22 through the second pipeline 42. Finally, from the outlet of the water pump 22, it enters the first honeycomb pipeline 211 through the first inlet pipe 3. This allows for heat exchange with the generator body 1, raising the generator's temperature and consequently the grease's temperature. This ensures the grease can form an effective oil film, thus extending the lifespan of the doubly-fed generator 100. The coolant, having completed heat exchange, then enters the first section 411, and the cycle continues, ensuring the grease operates within its suitable temperature range. It should be noted that if the grease temperature exceeds the preset temperature, the three-way solenoid valve 7 connects the first port 71 and the second port 72, and disconnects the first port 71 and the third port 73. The coolant in the first section 411 then enters the second section 412, which in turn enters the second honeycomb pipe to exchange heat with the heat sink 231, preventing overheating of the generator body 1 and reducing its lifespan. By regulating the temperature of the generator body 1, the lifespan of the doubly-fed generator 100 is effectively extended. The heating element 6 is an existing structural component.

[0037] Please see Figure 1 In one embodiment, the doubly fed generator 100 further includes a control module and a temperature sensor 8. The temperature sensor 8 is used to detect the temperature of the lubricating grease inside the generator body 1. The temperature sensor 8, water pump 22, heating element 6 and three-way solenoid valve 7 are all communicatively connected to the temperature sensor 8. Temperature sensor 8 is used to detect the temperature of the lubricating grease, allowing the control module to determine whether the current temperature of the lubricating grease is lower than the preset temperature. If it is lower than the preset temperature, the three-way solenoid valve 7 is controlled to disconnect the connection between the first port 71 and the second port 72, and connect the first port 71 and the third port 73 to maintain the temperature of the lubricating grease at the applicable temperature. When the temperature of the lubricating grease is higher than the preset temperature, the control module controls the three-way solenoid valve to disconnect the connection between the first port 71 and the third port 73, and connect the first port 71 and the second port 72, thereby ensuring that the generator body 1 can operate at the applicable temperature. If the temperature of the lubricating grease is too high, for example, if the temperature of the lubricating grease is higher than 110 degrees Celsius, the control module controls the motor speed to increase, thereby accelerating the heat dissipation of the heat sink 231 and increasing the rate at which the heat sink 231 reduces the coolant, thereby ensuring that the generator body 1 can operate at the applicable temperature. Through intelligent temperature control of the generator body 1, the service life of the generator body 1 is effectively improved.

[0038] Please see Figure 1 In one embodiment, the doubly-fed generator 100 further includes a first one-way valve 91, which is disposed on the second outlet pipe 20. The first one-way valve 91 allows the coolant in the water tank 5 to flow sequentially through the second outlet pipe 20 and the second pipeline 42 before flowing into the inlet of the water pump 22. By setting the first one-way valve 91, water in the second pipeline 42 can be effectively prevented from flowing into the water tank 5 through the second outlet pipe 20. The second one-way valve 92 is provided on the second pipeline 42 to prevent the coolant in the second outlet pipe 20 from flowing into the second honeycomb pipeline through the second pipeline 42.

[0039] In one embodiment, the first water outlet pipe 4 can also be connected to the inner wall of the nacelle of the wind turbine generator. By connecting the first water outlet pipe 4 to the inner wall of the nacelle of the wind turbine generator, heat is dissipated through heat exchange between the nacelle of the wind turbine generator and the air, thereby effectively improving the cooling effect of the coolant and thus extending the service life of the doubly-fed generator 100.

[0040] The above description is merely an exemplary embodiment of the present invention and does not limit the scope of protection of the present invention. Any equivalent structural transformations made based on the technical concept of the present invention and the contents of the specification and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present invention.

Claims

1. A doubly-fed generator, characterized in that, Includes |: Generator body; A cooling system includes a first flexible heat-conducting element, a water pump, and a heat dissipation assembly. The first flexible heat-conducting element surrounds the generator body and forms a first honeycomb-shaped pipeline inside. The first honeycomb-shaped pipeline includes multiple interconnected and arrayed first polygonal heat-conducting pipes. The first flexible heat-conducting element includes a first end and a second end disposed opposite to each other. The first end has at least one first polygonal heat-conducting pipe connected to a first water inlet pipe, and the second end has at least one first polygonal heat-conducting pipe connected to a first water outlet pipe. The water inlet end of the water pump can be connected to the first water outlet pipe, and the heat dissipation assembly is connected to the first water outlet pipe. The water outlet end of the water pump is connected to the first water inlet pipe. The water pump is used to drive the coolant to flow in the first honeycomb-shaped pipeline, the first water inlet pipe, and the first water outlet pipe.

2. The doubly-fed generator as described in claim 1, characterized in that, The heat dissipation assembly includes a heat dissipation body and a second flexible heat conductor. One side of the heat dissipation body is connected to the second flexible heat conductor. The interior of the second flexible heat conductor forms a second honeycomb-shaped pipeline. The second honeycomb-shaped pipeline includes a plurality of interconnected and arrayed second polygonal heat conductors. The second flexible heat conductor includes a third end and a fourth end that are disposed opposite to each other. The first water outlet pipe includes a first pipeline and a second pipeline. One end of the first pipeline is connected to at least one of the first polygonal heat conductors at the second end, and the other end of the first pipeline is connected to at least one of the second polygonal heat conductors at the third end. One end of the second pipe is connected to at least one of the second polygonal heat-conducting pipes at the fourth end, and the other end of the second pipe is connected to the water inlet of the water pump.

3. The doubly-fed generator as described in claim 2, characterized in that, The heat dissipation body includes a heat dissipation plate and heat dissipation fins. One side of the heat dissipation plate is attached to the second flexible heat-conducting element, and the other side of the heat dissipation plate is connected to the heat dissipation fins.

4. The doubly-fed generator as described in claim 3, characterized in that, The number of heat dissipation fins is multiple, and the multiple heat dissipation fins are arranged at intervals.

5. The doubly-fed generator as described in claim 3, characterized in that, The heat dissipation assembly also includes a driver and a fan. The driver is connected to the fan and is used to drive the fan to rotate. The air outlet side of the fan is positioned towards the heat dissipation fins.

6. The doubly-fed generator as described in claim 5, characterized in that, The driving component is a motor, and the fan is sleeved on the rotating shaft of the motor so that the motor can drive the fan to rotate.

7. The doubly-fed generator as described in claim 2, characterized in that, The doubly-fed generator further includes a water tank, a heating element, and a three-way solenoid valve. The heating element is disposed inside the water tank, which is used to contain coolant. The three-way solenoid valve includes a first port, a second port, and a third port. The first pipeline includes a first section and a second section. One end of the first section is connected to at least one first polygonal heat-conducting pipe at the second end, and the other end of the first section is connected to the first port. One end of the second section is connected to the second port, and the other end of the second section is connected to at least one second polygonal heat-conducting pipe at the third end. The third port is connected to the inlet end of the water tank through a second inlet pipe, and the outlet end of the water tank is connected to the second pipeline through a second outlet pipe.

8. The doubly-fed generator as described in claim 7, characterized in that, The doubly fed generator also includes a control module and a temperature sensor. The temperature sensor is used to detect the temperature of the lubricating grease inside the generator body. The temperature sensor, the water pump, the heating element, and the three-way solenoid valve are all communicatively connected to the temperature sensor.

9. The doubly-fed generator as described in claim 7, characterized in that, The doubly fed generator also includes a first one-way valve, which is located on the second outlet pipe. The first one-way valve allows the coolant in the water tank to flow sequentially through the second outlet pipe and the second pipeline before flowing into the inlet of the water pump.

10. The doubly-fed generator as described in any one of claims 1 to 9, characterized in that, The first water outlet pipe can also be connected to the inner wall of the wind turbine generator nacelle.

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