Wind turbine generator set, environmental control system and environmental control method

Abstract

The present invention discloses a wind turbine generator set, an environmental control system and an environmental control method. The system includes a condensation device located outside the nacelle, an air-liquid heat exchanger, a refrigeration cycle device and an induced draft fan located inside the nacelle; the environmental control system includes two heat exchange devices, namely an air-liquid heat exchanger and a refrigeration cycle device. According to the nacelle environment and the operating conditions of various components such as the main bearing, one of the two sets or both sets can be reasonably selected to cool and dehumidify the nacelle gas, that is, single-stage cooling and dehumidification can be achieved, or two-stage cooling and dehumidification can be achieved. Moreover, with two cold sources, the flexibility of use is greatly improved. And the main heat exchange components in the environmental control system in this article are all located inside the nacelle, and the refrigeration capacity is relatively high. In this way, all or most of the heat-generating components of the wind turbine generator set located at the top of the tower can be concentrated and installed inside the nacelle, which is beneficial to optimizing the internal structure layout of the nacelle.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and particularly to a wind turbine generator set, an environmental control system and an environmental control method. Background Art

[0002] A wind turbine generator set is a device that converts wind energy into electrical energy, and its role in economic life is becoming increasingly important.

[0003] A wind turbine generator set generally includes a tower barrel and equipment components located at the top of the tower barrel. The equipment components include a nacelle and a hub. The hub is rotatably installed on the nacelle base through a main bearing, and blades are installed on the hub. An installation cavity is formed inside the nacelle. For large-power offshore wind turbine generator sets, after considering the design of placing power components such as a converter and a transformer substation, which are traditionally placed at the bottom of the tower barrel, in the nacelle, a large number of heat-generating components such as a generator, a gearbox, and a converter controller are installed inside the installation cavity of the nacelle. Among them, when the wind turbine generator set is working, each component generates heat. In particular, the generator, the gearbox (for the setting of a doubly-fed unit), the converter controller, and the main bearing generate a large amount of heat during operation. These heats need to be released to the external environment in time. Otherwise, the heat accumulation will cause the temperature of each component to be too high, affecting the normal operation of the components and reducing the working efficiency of the wind turbine generator set.

[0004] How to make the cooling effect of the equipment at the top of the wind turbine better, so as to keep the operation of the wind turbine generator set in a high-efficiency state, is the goal that those skilled in the art have been pursuing. Summary of the Invention

[0005] The present invention provides an environmental control system for a wind turbine generator set, which includes a condensation device located outside the nacelle, an air-liquid heat exchanger located inside the nacelle, and a refrigeration cycle device forming a refrigerant circuit. The refrigeration cycle device at least includes a compressor, a condenser, and an evaporator connected in sequence; the condensation device can form a first cooling circuit with the air-liquid heat exchanger to cool the heat exchange medium in the air-liquid heat exchanger, and the condensation device can form a second cooling circuit with the condenser to cool the refrigerant flowing through the condenser;

[0006] It further includes an induced draft fan for providing the power for the air flow in the nacelle to circulate through the air-liquid heat exchanger and the evaporator.

[0007] As can be seen from the above description, the environmental control system in the present invention includes two heat exchange devices, namely an air-liquid heat exchanger and a refrigeration cycle device. According to the cabin environment and the operating conditions of various components such as the main bearing, one or both of the two sets can be reasonably selected to cool and dehumidify the cabin gas, that is, single-stage cooling and dehumidification can be achieved, and two-stage cooling and dehumidification can also be achieved. Moreover, with two cold sources, the flexibility of use is greatly improved. And the main heat exchange components in the environmental control system in this article are all located inside the cabin, and the refrigeration capacity is relatively high. In this way, all or most of the heat-generating components of the wind turbine generator located at the top of the tower can be concentrated and installed inside the cabin, that is, the cooling of each heat-generating component is centrally achieved through the environmental control system with high refrigeration capacity provided in this article, which is beneficial to optimizing the internal structure layout of the cabin.

[0008] That is to say, according to the different operating conditions of the wind turbine generator, the environmental control system provided by the present invention can be set to a first cooling mode, a second cooling mode, and a dehumidification mode. The first cooling mode can be that only the air-liquid heat exchanger or the refrigeration cycle device works. This operating condition is suitable for the situation where the ambient temperature inside the cabin is not too high, and a small amount of cooling capacity can maintain the normal operation of the wind turbine generator; the second cooling mode is that the first cooling mode can be that only the air-liquid heat exchanger and the refrigeration cycle device work simultaneously. This mode is suitable for the operating condition where the cabin temperature is relatively high and a large amount of cooling capacity is required; the dehumidification mode is suitable for the situation where the ambient humidity inside the cabin is relatively large and dehumidification is required while refrigerating. At this time, the air-liquid heat exchanger is maintained to perform primary cooling on the gas, and then the refrigeration cycle device is started to dehumidify the cooled gas, so that some water in the gas is separated out.

[0009] Optionally, it further includes a box body with an air outlet and an air inlet. The box body is located inside the cabin, and the air-liquid heat exchanger and the refrigeration cycle device are integrated inside the box body.

[0010] Optionally, along the air flow direction, the air-liquid heat exchanger and the evaporator are arranged in sequence, so that the air flow sequentially passes through the air-liquid heat exchanger and the evaporator for heat exchange.

[0011] Optionally, it further includes a first pipeline and a main bearing heat dissipation assembly. The first pipeline is used to connect the air outlet of the box body and the hub space of the wind turbine generator; the main bearing heat dissipation assembly is used to form a heat dissipation channel for the main bearing; the first pipeline, the hub space, the heat dissipation channel, the interior of the cabin, and the box body form an air circulation flow channel.

[0012] Optionally, the main bearing heat dissipation assembly includes a plurality of heat dissipation fins, and each heat dissipation fin is arranged circumferentially along the main bearing and is in contact installation with the outer edge of the main bearing.

[0013] Optionally, it further includes a seal, the outer edge of which is connected to the inner edge of the heat sink. The seal is provided with a ventilation opening, and the first pipe is connected between the air outlet of the box body and the ventilation opening.

[0014] Optionally, the air-liquid heat exchanger includes a plate-fin heat exchanger; and / or, the condensation device is an air-liquid condensation device located outside the top wall of the engine room.

[0015] Optionally, the induced draft fan is integrated inside the box body and is close to the air outlet position.

[0016] Optionally, it further includes a temperature sensor for detecting the operating temperature of the main bearing; when the operating temperature of the main bearing is higher than a preset value, start the air-liquid heat exchanger and the refrigeration cycle device to cool the air simultaneously; when the operating temperature of the main bearing is lower than or equal to the preset value, only start the air-liquid heat exchanger to cool the air.

[0017] Optionally, it further includes a humidity sensor for detecting the humidity of the environment inside the engine room or inside the hub; when the operating temperature of the main bearing is not higher than the preset value and the environmental humidity is higher than a predetermined value, simultaneously turn on the air-liquid heat exchanger and the refrigeration cycle device, and control the temperature of the air flow after passing through the evaporator to be lower than the dew point.

[0018] In addition, the present invention further provides a wind power generating set, including a tower barrel and an engine room located at the top of the tower barrel, and further including the environmental control system of the wind power generating set according to any one of the above, wherein the air-liquid heat exchanger and the refrigeration cycle device are located inside the engine room, and the condensation device is located outside the engine room.

[0019] Optionally, the heat generating components inside the engine room include an inverter and a box transformer.

[0020] Furthermore, the present invention further provides a method for environmental control of a wind power generating set. The environmental control system includes a condensation device located outside the engine room, an air-liquid heat exchanger located inside the engine room, and a refrigeration cycle device forming a refrigerant circuit. The refrigeration cycle device at least includes a compressor, a condenser, and an evaporator connected in sequence; the specific steps of the environmental control method are as follows:

[0021] Detect the operating temperature of the main bearing of the hub;

[0022] When the operating temperature of the main bearing is higher than a preset value, start the air-liquid heat exchanger and the refrigeration cycle device to cool the air simultaneously; when the operating temperature of the main bearing is lower than or equal to the preset value, only start the air-liquid heat exchanger to cool the air.

[0023] Optionally, the humidity of the internal space of the nacelle or the internal space of the hub is further detected;

[0024] When the operating temperature of the main bearing is not higher than the preset value and the ambient humidity is higher than the predetermined value, the air-liquid heat exchanger and the refrigeration cycle device are simultaneously turned on, and the temperature of the air flowing through the evaporator is controlled to be lower than the dew point to dehumidify the wind turbine generator set.

[0025] The wind turbine generator set provided by the present invention includes the above-mentioned environmental control system, and the environmental control method depends on the implementation of the above-mentioned environmental control system, so both also have the technical effects of the environmental control system. Description of the Drawings

[0026] Figure 1 It is a schematic structural diagram of an environmental control system applied to a wind turbine generator set in an embodiment of the present invention;

[0027] Figure 2 It is a flowchart of an environmental control method for a wind turbine generator set in an embodiment of the present invention.

[0028] Wherein, Figure 1 The corresponding relationship between the reference numerals and the component names in the drawings is as follows:

[0029] 1 Inner space of the hub; 2 Radiator fins; 3 Inner space of the nacelle; 4 Condensing device; 5 First pipeline; 7 Sealing member; 8 Main bearing; 9 Box body;

[0030] 6-1 Induced draft fan; 6-2 Condenser; 6-3 Evaporator; 6-4 Second cooling circuit; 6-5 Air-liquid heat exchanger; 6-6 Three-way valve. Detailed Embodiments

[0031] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0032] Please refer to Figure 1 , Figure 1 It is a schematic structural diagram of an environmental control system applied to a wind turbine generator set in an embodiment of the present invention.

[0033] In the present invention, the wind turbine generator set provided by the present invention includes a tower barrel, a nacelle and an impeller. The bottom of the tower barrel is supported on the ground foundation, and the nacelle is arranged at the top. The nacelle can rotate relative to the tower barrel to achieve yaw. For a direct-drive unit, the generator is generally arranged outside the nacelle, between the impeller and the nacelle, as Figure 1As shown, from left to right, there are an impeller, a generator, and a nacelle in sequence; especially for high-power offshore wind turbines, the impeller, generator, and nacelle at the top of the tower form an organic overall with environmental control, and relevant environmental control operations such as cooling, dehumidifying, and desalting need to be carried out on this organic whole to effectively ensure the normal and stable operation of the wind turbine.

[0034] Moreover, the present invention provides an improved environmental control system for a wind turbine generator set. This improved wind turbine generator set can be a high-power or extra-high-power unit, especially an offshore unit. In this unit, since the bottom of the tower is seawater instead of land, power components such as a converter and a transformer box that are traditionally placed at the bottom of the tower are placed inside the nacelle, canceling the placement of important components at the bottom of the tower. This is beneficial for offshore wind turbine generators and can avoid the influence of seawater erosion on components such as the converter and the transformer box. However, since power components such as the converter and the transformer box are components with large heat generation, when concentrated in the nacelle, higher requirements for cooling the nacelle are put forward. Therefore, the environmental control system provided by the present invention based on this background is a system that circulates inside the nacelle, hub, and the internal space of the generator, does not introduce air in the external environment that is humid, contains salt mist, and dust particles, and uses a heat dissipation system with dual cold source coupling to meet the heat dissipation requirements of the nacelle with large heat generation, making the applicability of the wind turbine stronger. Of course, this environmental control system can also be applied to wind turbine generator sets with general nacelle settings.

[0035] Specifically, the present invention provides an environmental control system, which is mainly used for dehumidifying the internal space 4 environment of the nacelle and the internal space 1 environment of the hub and cooling components inside the nacelle, main bearings 8 and other components. The environmental control system includes a condensation device 4, an air-liquid heat exchanger 6-5, and a refrigeration cycle device. Among them, the condensation device 4 is installed outside the nacelle. For wind turbine generator sets installed on land, the condensation device 4 can be installed on the outer wall of the nacelle, and the heat exchange medium such as water inside the condensation device 4 is cooled by the external environmental air. For offshore wind turbine generator sets, the condensation device 4 can be installed in the sea, and of course, it can also be installed on the outer wall of the nacelle to perform heat exchange using environmental air.

[0036] It should be noted that the air-liquid heat exchanger 6-5 described herein refers to a heat exchanger in which the two heat exchange media are air and liquid respectively. The air-liquid heat exchanger 6-5 can form a first cooling circuit with the condensation device 4 to cool the air flow passing through the air-liquid heat exchanger 6-5. That is to say, the liquid in the first cooling circuit is cooled down in the condensation device 4, enters the air-liquid heat exchanger 6-5, exchanges heat with the air flow passing through the surface of the air-liquid heat exchanger 6-5 during the process of flowing through the air-liquid heat exchanger 6-5, the air flow is cooled down, the liquid of the air-liquid heat exchanger is heated up, and the heated liquid flows back into the condensation device 4 again to exchange heat with the external environment for cooling down.

[0037] The refrigeration cycle device provided by the present invention at least includes a compressor, a condenser 6-2, and an evaporator 6-3 that are sequentially connected through pipelines. The refrigerant can flow in the refrigeration circuit formed by the compressor, the condenser 6-2, and the evaporator 6-3. During operation, the refrigerant is compressed and heated up in the compressor, and then flows from the outlet of the compressor into the interior of the condenser 6-2, where it exchanges heat with cold water (flowing from the condensation device 4 into the condenser 6-2) and is cooled down. The cooled refrigerant flows out of the condenser 6-2 and enters the evaporator 6-3, where it exchanges heat with the air flow passing over the surface of the evaporator 6-3. In this way, the air flow is cooled down, and the refrigerant is heated up. The heated refrigerant then flows back into the interior of the compressor again.

[0038] The above-mentioned condensation device 4 can also form a second cooling circuit 6-4 with the condenser 6-2, and the second cooling circuit 6-4 is used to cool the refrigerant in the condenser 6-2. There can be one condensation device 4, and the air-liquid heat exchanger 6-5 and the condenser 6-2 form a circuit with the same condensation device 4. As Figure 1 shown, the condensation device 4 is connected to the air-liquid heat exchanger 6-5 and the condenser 6-2 through a three-way valve 6-6. Of course, the condensation device 4 can also be set to two or more, and one or more condensation devices 4 respectively form circuits with the air-liquid heat exchanger 6-5 and the condenser 6-2.

[0039] In order to enable the air flow in the cabin to effectively and quickly pass through the air-liquid heat exchanger 6-5 and the evaporator 6-3, the environmental control system of the present invention further includes an induced draft fan 6-1. The induced draft fan 6-1 can provide the power for the air flow in the cabin to circulate through the air-liquid heat exchanger 6-5 and the evaporator 6-3, which is beneficial to realizing uniform heat exchange of the gas in the cabin.

[0040] From the above description, it can be seen that the environmental control system in the present invention includes two heat exchange devices, namely the air-liquid heat exchanger 6-5 and the refrigeration cycle device. According to the cabin environment and the operating conditions of various components such as the main bearing 8, one or both of the two sets can be reasonably selected to cool and dehumidify the cabin gas, that is, single-stage cooling and dehumidification can be achieved, and two-stage cooling and dehumidification can also be achieved. Moreover, with two cold sources, the flexibility of use is greatly improved. And the main heat exchange components in the environmental control system in this article are all located in the interior space 4 of the cabin, and the refrigeration capacity is relatively high. In this way, the large heat-generating components including the converter and the box transformer located at the top of the tower of the wind turbine generator can be centrally installed in the interior space 4 of the cabin, that is, through the environmental control system with high refrigeration capacity provided in this article, the cooling and temperature reduction of the large heat-generating components including the converter and the box transformer in the cabin can be centrally achieved, which is beneficial to the stable operation of large-megawatt and offshore wind turbine generators.

[0041] That is to say, according to different operating conditions of the wind turbine generator set, the environmental control system provided by the present invention can be set to a first cooling mode, a second cooling mode, and a dehumidification mode. The first cooling mode can be that only the air-liquid heat exchanger 6-5 or the refrigeration cycle device operates. This operating condition is applicable when the ambient temperature in the nacelle is not too high and only a small amount of cooling capacity is required to maintain the normal operation of the wind turbine generator. The second cooling mode is based on the first cooling mode, enabling the air-liquid heat exchanger 6-5 and the refrigeration cycle device to operate simultaneously. This mode is applicable to the operating condition where the nacelle temperature is relatively high and a large amount of cooling capacity is required. The dehumidification mode is applicable when the ambient humidity in the nacelle is relatively high and dehumidification is required while refrigerating. At this time, the air-liquid heat exchanger 6-5 is maintained to initially cool the gas, and then the refrigeration cycle device is started to secondarily cool the gas, so that the gas temperature drops below the dew point, and the water vapor in the air can be precipitated in a liquid form to achieve the dehumidification function.

[0042] In a specific embodiment, the environmental control system in the present invention further includes a box body 9. The box body 9 has an air outlet and an air inlet. The air-liquid heat exchanger 6-5 and the refrigeration cycle device are integrated inside the box body 9, so that all the main components of the environmental control system can be prefabricated in the box body 9 and then installed in the nacelle together, which is beneficial to modular assembly and operation, and improves the assembly efficiency and quality stability. During operation, the gas in the nacelle enters the inside of the box body 9 from the air inlet of the box body 9. The position of the air inlet can be at a suitable position of the box body 9, specifically, it can be at the upstream position of the air flow of the induced draft fan 6-1, and no specific limitation is made here. After the air flow enters the box body 9, it exchanges heat for cooling and / or dehumidification with the air-liquid heat exchanger 6-5 and the refrigeration cycle device located inside the box body 9. In this way, the box body 9 can also play a role in concentrating the air flow.

[0043] In a preferred embodiment, along the air flow direction, the air-liquid heat exchanger 6-5 and the evaporator 6-3 are arranged in sequence, so that the air flow sequentially passes through the air-liquid heat exchanger 6-5 and the evaporator 6-3 for heat exchange.

[0044] In this embodiment, the air flow is first cooled by the air-liquid heat exchanger 6-5, and then cooled and dehumidified by the evaporator 6-3, which is beneficial to improving the overall cooling and dehumidification efficiency of the system.

[0045] In the above embodiments, the environmental control system may further include a first pipeline 5 and a main bearing heat dissipation assembly. The first pipeline 5 is used to connect the air outlet of the box body 9 and the hub space of the wind turbine generator set; the main bearing heat dissipation assembly is used to form a heat dissipation channel for the main bearing; the first pipeline 5, the hub space, the heat dissipation channel, the internal space 4 of the nacelle, and the box body 9 form an air circulation flow channel.

[0046] That is to say, the internal space 4 of the nacelle and the internal space 1 of the hub are connected through the internal space of the box body 9, the first pipeline 5 and the heat dissipation channel of the main bearing to form a circulation loop. In this way, under the power action of the induced draft fan 6-1, the gas can circulate inside the nacelle and the hub space, and at the same time, the main bearing can be cooled.

[0047] It should be noted that the main bearing described in this article refers to the bearing on which the hub is rotatably installed in the nacelle. That is, the hub is rotatably installed on the nacelle through the main bearing.

[0048] In the above embodiment, the environmental control system provided by the present invention can cool and dehumidify the nacelle and its internal components, the internal space 1 of the hub, and the main bearing at the same time, further simplifying the system structure, improving the system utilization rate, and being beneficial to optimizing the structure of the wind turbine generator set.

[0049] Specifically, the main bearing heat dissipation assembly may include a plurality of heat dissipation fins 2, and each heat dissipation fin 2 is arranged along the circumference of the main bearing and is in contact installation with the outer edge of the main bearing; it also includes a seal 7, the outer edge of which is connected to the inner edge of the heat dissipation fin 2, and a ventilation opening is provided on the seal 7, and the first pipeline 5 is connected between the air outlet of the box body 9 and the ventilation opening.

[0050] The seal 7 isolates the internal space 1 of the hub from the internal space of the nacelle, and the air flow can only flow between the two spaces through the first pipeline 5 or the heat dissipation fins 2. The seal 7 can be a plate member with a certain hardness or a flexible member with the function of isolating the air flow.

[0051] The main bearing is of an annular structure, the heat dissipation fins 2 are arranged on the inner ring of the main bearing, and the seal 7 is also approximately circular and is located in the inner ring surrounded by each heat dissipation fin 2, so that the air flow can only flow through the flow channel formed by the heat dissipation fin 2 and the inner ring of the bearing.

[0052] In the above embodiment, the gas first enters the hub space through the first pipeline 5, then flows into the heat exchange channel formed by the heat dissipation fins 2 after passing through the hub space, returns to the internal space 4 of the nacelle, and finally enters the internal space of the box body 9.

[0053] The air-liquid heat exchanger 6-5 in the above embodiments may include a plate-fin heat exchanger.

[0054] The above-mentioned condensing device 4 may be an air-liquid condensing device 4, which is located outside the top wall of the nacelle. The air-liquid condensing device 4 relies on the outside air as the heat exchange medium, and the outside air cools the liquid circulating in the condensing device 4.

[0055] The induced draft fan 6-1 in the above embodiments may also be integrated inside the box body 9, and is preferably close to the air outlet position. Of course, the installation method of the induced draft fan 6-1 described in this article can also be arranged outside the box body 9 or close to the air inlet position.

[0056] In the above embodiments, in order to achieve the precise operation of the system, the environmental control system may further include a temperature sensor for detecting the operating temperature of the main bearing. When the operating temperature of the main bearing is higher than the preset value, the air-liquid heat exchanger 6-5 and the refrigeration cycle device are started simultaneously to cool the air. When the operating temperature of the main bearing is lower than or equal to the preset value, only the air-liquid heat exchanger 6-5 is started to cool the air.

[0057] The above preset value can be reasonably set according to the specific wind turbine applied. The non-disclosure of the preset value in this article does not prevent those skilled in the art from understanding and implementing the technical solutions in this article.

[0058] Furthermore, the above embodiments may further include a humidity sensor for detecting the environmental humidity in the nacelle interior space 4 or the hub interior space 1. When the operating temperature of the main bearing is not higher than the preset value and the environmental humidity is higher than the predetermined value, the air-liquid heat exchanger 6-5 and the refrigeration cycle device are simultaneously turned on, and the temperature of the air flow after passing through the evaporator 6-3 is controlled to be lower than the dew point, which is the dehumidification mode described above.

[0059] Please refer to Figure 2 , Figure 2 which is a flowchart of the environmental control method for a wind turbine in an embodiment of the present invention.

[0060] Based on the above environmental control system, the present invention also provides an environmental control method for a wind turbine. The environmental control system of the wind turbine includes a condensing device 4 located outside the nacelle, an air-liquid heat exchanger 6-5 located inside the nacelle, and a refrigeration cycle device forming a refrigerant circuit. The refrigeration cycle device at least includes a compressor, a condenser 6-2, and an evaporator 6-3 connected in sequence. The specific steps of this environmental control method are as follows:

[0061] S1. Detect the operating temperature of the hub main bearing;

[0062] S2. When the operating temperature of the main bearing is higher than the preset value, start the air-liquid heat exchanger 6-5 and the refrigeration cycle device simultaneously to cool the air. When the operating temperature of the main bearing is lower than or equal to the preset value, only start the air-liquid heat exchanger 6-5 to cool the air.

[0063] In S1 above, the environmental humidity in the nacelle interior space 3 or the hub interior space 1 is further detected;

[0064] In step S2, the following further judgment is made: when the operating temperature of the main bearing is not higher than the preset value and the environmental humidity is higher than the predetermined value, the air-liquid heat exchanger 6-5 and the refrigeration cycle device are simultaneously turned on, and the temperature of the air flow after passing through the evaporator 6-3 is controlled to be lower than the dew point to dehumidify the wind turbine.

[0065] Since the wind turbine unit described in the present invention has the above-mentioned environmental control system and the environmental control method is based on the above-mentioned environmental control system, both the wind turbine unit and the environmental control method have the above-mentioned technical effects of the environmental control system.

[0066] The above has introduced in detail a wind turbine unit, an environmental control system and an environmental control method provided by the present invention. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. An environmental control system for a wind turbine generator, characterized in that, The environmental control system is at least used for dehumidifying the internal space environment of the nacelle and the internal space environment of the hub, and cooling the components inside the nacelle and the main bearing. The environmental control system includes a condensation device (4) located outside the nacelle, an air-liquid heat exchanger (6-5) located inside the nacelle, and a refrigeration cycle device forming a refrigerant circuit. The refrigeration cycle device at least includes a compressor, a condenser (6-2), and an evaporator (6-3) connected in sequence. The condensation device (4) can form a first cooling circuit with the air-liquid heat exchanger (6-5) to cool the heat exchange medium in the air-liquid heat exchanger (6-5), and the condensation device (4) can form a second cooling circuit with the condenser (6-2) to cool the refrigerant flowing through the condenser (6-2). Wherein, the air-liquid heat exchanger (6-5) and the refrigeration cycle device are configured to be able to cool the air inside the nacelle simultaneously. It further includes an induced draft fan (6-1) for providing the power for the air flow in the nacelle to circulate through the air-liquid heat exchanger (6-5) and the evaporator (6-3). Wherein, along the air flow direction, the air-liquid heat exchanger (6-5) and the evaporator (6-3) are arranged in sequence so that the air flow passes through the air-liquid heat exchanger (6-5) and the evaporator (6-3) in sequence for heat exchange. When the operating temperature of the main bearing is higher than the preset value, start the air-liquid heat exchanger (6-5) and the refrigeration cycle device to cool the air simultaneously. When the operating temperature of the main bearing is lower than or equal to the preset value, only start the air-liquid heat exchanger (6-5) to cool the air. When the operating temperature of the main bearing is not higher than the preset value and the environmental humidity is higher than the predetermined value, turn on the air-liquid heat exchanger (6-5) and the refrigeration cycle device simultaneously, and control the temperature of the air flow after passing through the evaporator (6-3) to be lower than the dew point to dehumidify the wind turbine generator set.

2. The environmental control system for a wind turbine generator according to claim 1, characterized in that, It further includes a box body (9) having an air outlet and an air inlet. The box body (9) is located inside the nacelle, and the air-liquid heat exchanger (6-5) and the refrigeration cycle device are integrated inside the box body (9).

3. The environmental control system for a wind turbine generator according to claim 2, characterized in that, Along the air flow direction, the air-liquid heat exchanger (6-5) and the evaporator (6-3) are arranged in sequence so that the air flow passes through the air-liquid heat exchanger (6-5) and the evaporator (6-3) in sequence for heat exchange.

4. The environmental control system for a wind turbine generator according to claim 2, characterized in that, It further includes a first pipeline (5) and a main bearing heat dissipation assembly. The first pipeline (5) is used to connect the air outlet of the box body (9) and the hub space of the wind turbine generator set. The main bearing heat dissipation assembly is used to form a heat dissipation channel for the main bearing. The first pipeline (5), the hub space, the heat dissipation channel, the internal space (3) of the nacelle, and the box body (9) form an air circulation flow channel.

5. The environmental control system for a wind turbine generator according to claim 4, characterized in that, The main bearing heat dissipation assembly includes a plurality of heat dissipation fins (2), and each heat dissipation fin (2) is arranged along the circumferential direction of the main bearing and is in contact installation with the outer edge of the main bearing.

6. The environmental control system for a wind turbine generator according to claim 5, characterized in that, It further includes a seal (7), the outer edge of which is connected to the inner edge of the heat sink (2). A ventilation opening is provided on the seal (7), and the first pipe (5) is connected between the air outlet of the box body (9) and the ventilation opening.

7. The environmental control system for a wind turbine generator according to claim 4, characterized in that, The air-liquid heat exchanger (6-5) includes a plate fin heat exchanger; and / or, the condensation device (4) is an air-liquid condensation device (4) located outside the top wall of the engine room.

8. The environmental control system for a wind turbine generator according to any one of claims 2 to 7, characterized in that, The induced draft fan (6-1) is integrated inside the box body (9) and close to the air outlet position.

9. A wind turbine generator, comprising a tower barrel and a nacelle located at the top of the tower barrel, characterized in that, It further includes the environmental control system of the wind turbine generator set according to any one of claims 1 to 8. The air-liquid heat exchanger (6-5) and the refrigeration cycle device are located in the internal space (3) of the engine room, and the condensation device (4) is located outside the engine room.

10. The wind turbine generator according to claim 9, characterized in that, The heat generating components in the engine room include an inverter and a box transformer.

11. A method for environmental control of a wind turbine generator according to claim 9 or 10, characterized in that, The environmental control system of the wind turbine generator set includes a condensation device (4) located outside the engine room, an air-liquid heat exchanger (6-5) located inside the engine room, and a refrigeration cycle device forming a refrigerant circuit. The refrigeration cycle device at least includes a compressor, a condenser (6-2) and an evaporator (6-3) connected in sequence; the specific steps of the environmental control method are as follows: Detect the working temperature of the hub main bearing; When the working temperature of the main bearing is higher than the preset value, start the air-liquid heat exchanger (6-5) and the refrigeration cycle device to cool the air at the same time; when the working temperature of the main bearing is lower than or equal to the preset value, only start the air-liquid heat exchanger (6-5) to cool the air; Further detect the environmental humidity in the internal space (3) of the engine room or the internal space (1) of the hub; When the working temperature of the main bearing is not higher than the preset value and the environmental humidity is higher than the predetermined value, turn on the air-liquid heat exchanger (6-5) and the refrigeration cycle device at the same time, and control the temperature of the air flow after passing through the evaporator (6-3) to be lower than the dew point to dehumidify the wind turbine generator set.

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