CN108167144B

CN108167144B - Cooling system, wind generating set with cooling system and cooling method of wind generating set

Info

Publication number: CN108167144B
Application number: CN201711457862.7A
Authority: CN
Inventors: 李金梦; 吴立洲
Original assignee: Jiangsu Goldwind Science and Technology Co Ltd
Current assignee: Jiangsu Goldwind Science and Technology Co Ltd
Priority date: 2017-12-28
Filing date: 2017-12-28
Publication date: 2020-02-14
Anticipated expiration: 2037-12-28
Also published as: CN108167144A

Abstract

The invention discloses a cooling system, a cooling method and a wind generating set with the cooling system. The cooling system includes: a cooling water supply unit for supplying cooling water; a pump pumping the cooling water supplied from the cooling water supply unit; the external radiator is used for enabling the cooling water subjected to heat exchange with an internal heat source of the wind generating set to exchange heat with air of an external environment; the cooling water pipe is used for circulating and flowing the cooling water; a flow control valve provided in the cooling water pipe for controlling the flow rate of the cooling water pumped by the pump; a temperature sensor for detecting a temperature of an external environment; the wind speed sensor is used for detecting the wind speed of the external environment; and the controller controls the opening of the flow control valve and the start and stop of the pump through the temperature of the external environment detected by the temperature sensor and the wind speed detected by the wind speed sensor.

Description

Cooling system, wind generating set with cooling system and cooling method of wind generating set

Technical Field

The invention relates to a cooling system, a wind generating set with the cooling system and a cooling method of the wind generating set.

Background

The wind generating set is a large complex device which is in service outdoors for a long time, and the running state of the wind generating set is often influenced by environmental factors such as temperature, humidity and the like. In the aspect of heat dissipation, for internal heat sources with large heat productivity, such as a converter, a generator, a frequency converter and other components, some wind power suppliers may give priority to water cooling measures to enhance heat dissipation, and for surface heat sources of general electrical components, fans are more adopted for direct air cooling.

However, these conventional cooling systems are designed with the objective of providing cooling that maximizes the heat production of the entire wind turbine generator system. That is, the cooling system for the nacelle is designed according to the maximum heat production of the nacelle components, and has different states only when the unit is distinguished between the operating state and the shutdown state.

However, when the wind speed is low and the wind turbine cannot be fully developed, the heat generation amount of each component of the wind turbine decreases, and the cooling amount of the cooling system remains unchanged, which not only causes the temperature inside the wind turbine to decrease and the humidity to increase, but also generates unnecessary energy consumption.

Specifically, when the wind speed is higher than the cut-in wind speed but the wind turbine cannot be fully developed, the heat generation amount of each component of the wind turbine decreases, and the cooling amount of the cooling system remains unchanged, which not only causes the temperature inside the wind turbine to decrease and the humidity to increase, but also causes unnecessary energy consumption. In the process of cutting wind speed to rated wind speed, the generated energy of the wind generating set is firstly increased and then unchanged (the generated energy is increased along with the increase of the wind speed before reaching the full wind speed, and the generated energy is unchanged along with the increase of the wind speed after reaching the full wind speed), and the heat generation quantity of the components is also firstly increased and then unchanged, which is not considered by the cooling system.

Of course, some techniques have also developed cooling systems that use different cooling circuits at different wind speeds. For example, at low wind speeds, in the operating mode of the converter, its output terminals are connected in order to reach zero reactive power, because of this operation the converter generates heat, resulting in a temperature increase, requiring cooling. The cooling circuit is now "converter-generator-recuperator-converter" to form a loop. At normal wind speeds (starting from cut-in wind speed to wind speed exceeding the rated wind speed), the cooling system forms two loops, one being "converter-heat exchanger-converter" and one being "generator-heat exchanger-generator".

However, this cooling system does not take into account the influence of the external ambient temperature on the cooling system. Specifically, it is known that the cooling system is not affected by the external environment temperature, because the cooling amount of the external radiator is increased as the external environment temperature is decreased, and the cooling amount of the external radiator is decreased as the external environment temperature is increased.

In addition, an external radiator of the cooling system is generally arranged at the top of the cabin or at the tail of the cabin, and due to speed attenuation caused by turbulent airflow of the front-end rotating blades, the passive radiating wind speed of the external radiator is lower than the actual wind speed, so that the radiating capacity is reduced. Further, as the specification of the wind turbine generator system increases, the amount of power generation increases and the amount of heat generated by the components increases, but the area of the external radiator facing the wind has an upper limit value, that is, the amount of cooling has an upper limit value, due to the restriction of the position of the nacelle roof. Moreover, the generated energy of the wind generating set is larger and larger, the heat generation amount is also larger and larger, and active heat dissipation devices such as fans and the like can be added at the front end of an external radiator for a system which cannot meet the cooling requirement of the wind generating set through passive heat dissipation. Furthermore, the external radiator, when located at the top of the nacelle, is vulnerable to typhoons, making its connection to the nacelle wall ineffective.

Disclosure of Invention

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a cooling system, a wind turbine generator system having the cooling system, and a cooling method thereof, which are improved to control the flow rate of cooling water according to the wind speed and temperature of the external environment, thereby controlling the temperature inside the wind turbine generator system and achieving an energy saving effect.

Another object of the present invention is to provide a cooling system, a wind turbine generator system having the same, and a cooling method thereof, which can increase the amount of heat radiation by changing the position of an external heat sink, and can increase the number of external heat sinks according to design requirements without limiting the number and size of the external heat sinks by the size of an installation space, and can increase the stability of the installation of the external heat sinks and reduce the influence of typhoon on the heat sinks.

In order to achieve the above object, a cooling system of a wind turbine generator set according to the present invention may include: a cooling water supply unit for supplying cooling water; a pump pumping the cooling water supplied from the cooling water supply unit; the external radiator is used for enabling the cooling water subjected to heat exchange with an internal heat source of the wind generating set to exchange heat with air of an external environment; the cooling water pipe is used for circulating and flowing the cooling water; a flow control valve provided in the cooling water pipe for controlling the flow rate of the cooling water pumped by the pump; a temperature sensor for detecting a temperature of an external environment; the wind speed sensor is used for detecting the wind speed of the external environment; and the controller controls the opening of the flow control valve and the start and stop of the pump through the temperature of the external environment detected by the temperature sensor and the wind speed detected by the wind speed sensor.

The pump may include a first pump and a second pump, and the first pump may pump the cooling water with a power greater than that of the second pump.

And under the condition that the wind speed detected by the wind speed sensor reaches or is higher than the full-open condition of the wind generating set and the temperature detected by the temperature sensor is higher than a first set temperature, the controller can control the first pump and the second pump to be started completely and the opening degree of the flow control valve to be opened completely.

And when the wind speed detected by the wind speed sensor reaches or is higher than the full-load condition of the wind generating set and the temperature detected by the temperature sensor is lower than a first set temperature and higher than a second set temperature, the controller can control the first pump and the second pump to be started completely and the opening degree of the flow control valve to be reduced along with the reduction of the temperature detected by the temperature sensor.

And under the condition that the wind speed detected by the wind speed sensor reaches or is higher than the full-open condition of the wind generating set and the temperature detected by the temperature sensor is lower than or equal to a second set temperature, the controller can control the first pump to be started, the second pump to be stopped and the opening degree of the flow control valve to be fully opened.

The controller may control the first pump and the second pump to be all started and the opening degree of the flow control valve to be decreased as the wind speed decreases, when the wind speed detected by the wind speed sensor does not reach a full wind speed of the wind turbine generator set and is equal to or higher than a predetermined wind speed, and the temperature detected by the temperature sensor is higher than a first set temperature.

And under the condition that the wind speed detected by the wind speed sensor does not reach the full-open condition of the wind generating set but is lower than the preset wind speed and the temperature detected by the temperature sensor is higher than a first set temperature, the controller can control the first pump to be started, the second pump to be stopped and the opening degree of the flow control valve to be fully opened.

The predetermined wind speed is a wind speed in a range of one third to one half of a rated wind speed of the wind turbine generator set.

The wind turbine generator set may include: a tower drum; a nacelle positioned atop the tower; a generator located at the forward end of the nacelle; the hub is located at the front end of the generator and provided with a plurality of blades (41), and the external radiator is installed on the front end wall surface of the hub or on the side wall surface of the upper end of the tower cylinder surrounding the tower cylinder.

The lower portion of the external heat sink may be provided with a maintenance platform, which may be fixed to the tower around the tower.

In order to achieve the above object, a wind park according to the invention may comprise a cooling system of a wind park as described above.

In order to achieve the above object, in a cooling method of a wind turbine generator system according to the present invention, the wind turbine generator system includes a cooling system including: a cooling water supply unit for supplying cooling water; a pump pumping the cooling water supplied from the cooling water supply unit; the external radiator is used for enabling the cooling water subjected to heat exchange with an internal heat source of the wind generating set to exchange heat with air of an external environment; the cooling water pipe is used for circulating and flowing the cooling water; a flow control valve provided in the cooling water pipe for controlling a flow rate of the cooling water pumped by the pump, characterized by comprising: detecting the temperature of the external environment by a temperature sensor, and detecting the wind speed of the external environment by a wind speed sensor; the controller controls the opening of the flow control valve and the start and stop of the pump through the temperature of the external environment detected by the temperature sensor and the wind speed detected by the wind speed sensor.

According to the invention, the flow of the cooling water can be controlled according to the wind speed and the temperature of the external environment, so that the control of the temperature in the wind generating set can be realized, and the effect of energy conservation can be achieved.

Moreover, according to the invention, the heat dissipation capacity can be increased by changing the position of the external radiator, and the number and the size of the external radiators are not limited by the size of the installation space, so that the number of the external radiators can be continuously increased according to the design requirement, the installation stability of the external radiators can be increased, and the influence of typhoon on the radiators can be reduced.

Drawings

FIG. 1 is a side view illustrating a wind turbine generator set according to an embodiment of the present invention;

fig. 2 is a configuration diagram showing a cooling system of a wind turbine generator set according to an embodiment of the present invention;

FIG. 3 is a schematic diagram for illustrating the location of an external heat sink according to an embodiment of the present invention;

fig. 4 is a schematic view for illustrating a position of an external heat sink according to another embodiment of the present invention.

Description of the symbols:

1: wind generating set 10: tower drum

20: the nacelle 30: generator

40: hub 41: blade

100: cooling water supply unit 200: pump and method of operating the same

210: first pump 220: second pump

300: external heat sink 400: cooling water pipe

500: the flow control valve 600: temperature sensor

700: the wind speed sensor 800: controller

900: maintenance platform

Detailed Description

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The advantages and features of the invention and the methods of accomplishing the same will become apparent by reference to the drawings and the detailed description of the embodiments. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in different forms from each other, and the embodiments are provided only to fully disclose the present invention and fully inform the scope of the present invention to those having ordinary knowledge in the art to which the present invention pertains, and the present invention is determined only by the scope described in the claims. Throughout the specification, like reference numerals denote like components.

As shown in fig. 1, a wind turbine generator system 1 according to an embodiment of the present invention includes: a tower 10; a nacelle 20 positioned atop the tower 10; a generator 30 located at the front end of the nacelle 20; a hub 40 located at the front end of the generator 30 and having a plurality of blades 41 mounted thereon; and a cooling system described later. The wind turbine generator system 1 may include a main bearing, a transformer, a pitch system, and various electrical components, in addition to the above-described components, which are well known to those skilled in the art, and thus detailed description thereof will be omitted.

Since the generator, the main bearing, the transformer, the pitch system, and the electrical components of the wind turbine generator system 1 generate a large amount of heat during operation, many electrical components may fail or even explode at high temperatures. Moreover, at high temperatures, the viscosity of the lubricating oil decreases, and grease leaks out, causing failure of the lubricating system. When the wind generating set 1 is shut down, the phase change (freezing and frosting) of the water-containing substances such as cooling cabinet liquid can be caused under the influence of the external low-temperature environment; the performance stability of electronic devices such as capacitors and the like is reduced; the viscosity of the lubricating grease is sharply increased, semi-solidification is carried out, the wettability is lost, an oil film cannot be formed, and finally the lubricating system fails.

Therefore, there is generally more than one temperature control system (such as a tower bottom temperature control system and a nacelle temperature control system) in the wind turbine generator system 1 for controlling the temperature of the components such as the generator, the main bearing, the converter, etc. Here, the components that generate heat when the wind turbine generator system is operating, such as the generator, the main bearing, the converter, and the frequency converter, may be referred to as an internal heat source of the wind turbine generator system 1.

The temperature control system is the equivalent of a cooling system in the case of operation of the wind park 1, since during operation of the wind park its components generate a lot of heat (i.e. the internal heat source of the wind park 1 generates heat), which needs to be removed to the outside environment in order to guarantee the lifetime and efficiency of the components. When the wind generating set is in a severe cold environment and is in a shutdown state, the environment in the wind generating set needs to be heated.

The invention is mainly concerned with cooling systems, and the medium in the system is water or other liquid.

Hereinafter, a cooling system of a wind turbine generator set according to an embodiment of the present invention will be described in detail.

Fig. 2 is a configuration diagram showing a cooling system of a wind turbine generator set according to an embodiment of the present invention.

As shown in fig. 2, a cooling system of a wind turbine generator system according to an embodiment of the present invention includes: a cooling water supply unit 100 for supplying cooling water; a pump 200 pumping the cooling water supplied from the cooling water supply unit 100; an external radiator 300 for heat-exchanging cooling water heat-exchanged with an internal heat source of the wind turbine generator system 1 with air of an external environment; a cooling water pipe 400 for circulating cooling water; a flow control valve 500 provided in the cooling water pipe 400 for controlling the flow rate of the cooling water pumped by the pump 200; a temperature sensor 600 for detecting the temperature of the external environment; and a wind speed sensor 700 for detecting a wind speed of an external environment. In one embodiment of the present invention, the flow control valve 500 is disposed between the pump 200 and the external radiator 300, however, the flow control valve 500 may be disposed at any position of the cooling water pipe 400 as long as it can control the flow rate of the cooling water pumped by the pump 200. The cooling water pipe may circulate cooling water in the cooling system, but preferably the cooling water pipe circulates cooling water in the order of the cooling water supply unit 100, the pump 200, and the external radiator 300.

Before the wind generating set 1 reaches a full-power state, the generating capacity of the wind generating set 1 is increased along with the increase of the wind speed, and the heat generating capacity of an internal heat source is increased; when the wind generating set 1 reaches a full-power state, the generating capacity does not change along with the increase of the wind speed, namely, the heat generation amount of the internal heat source does not increase any more. According to the heat transfer principle, the higher the temperature of the external environment, the smaller the temperature difference between the cooling water and the external environment, and the smaller the heat dissipation amount of the radiator. The flow rate of the cooling water is adjusted according to the wind speed and temperature of the external environment. In addition, the size of the radiator and the wind speed on the surface of the radiator are factors that influence the magnitude of the heat radiation.

To this end, the cooling system of the wind generating set according to an embodiment of the present invention further includes a controller 800 controlling the opening degree of the flow control valve 500 and the start and stop of the pump 200 by the temperature of the external environment detected by the temperature sensor 600 and the wind speed detected by the wind speed sensor 700. Therefore, the flow of cooling water can be controlled according to the wind speed and the temperature of the external environment, the control of the temperature in the wind generating set can be realized, and meanwhile, the energy-saving effect can be achieved.

Here, the pump 200 may include a first pump 210 and a second pump 220, and the first pump 210 pumps cooling water with a power greater than that of the second pump 220. Accordingly, the cooling system of the present invention includes two pumps, so that one pump is stopped and the other pump is operated to achieve an energy saving effect in the case where a required cooling effect can be satisfied by the driving force of the one pump without a large amount of cooling water flow. Here, if the wind turbine generator set is operated, it is considered that relatively large cooling is required, and thus the pump which is continuously operated in a normal case is preferably the first pump 210.

In a preferred embodiment, when the wind speed detected by the wind speed sensor 700 is equal to or higher than the full condition of the wind turbine generator system 1 and the temperature detected by the temperature sensor 600 is higher than the first set temperature, the controller 800 controls the first pump 210 and the second pump 220 to be all started and the opening degree of the flow control valve 500 to be fully opened. Accordingly, the flow rate of the cooling water is controlled to the maximum to satisfy the required cooling effect.

Here, the first set temperature refers to a higher external ambient temperature, for example, the first set temperature may be 30 ℃. The reason why the first set temperature is set is that the cooling effect (i.e., heat dissipation effect) of the external heat sink is relatively poor when the external ambient temperature is high and higher than the first set temperature (e.g., higher than 30 ℃), and the cooling effect of the external heat sink is relatively general or relatively good when the external ambient temperature is lower than the first set temperature. In the following description, the first set temperature also has the meaning as described above.

When the wind speed detected by the wind speed sensor 700 is equal to or higher than the full-wind condition of the wind turbine generator system and the temperature detected by the temperature sensor 600 is equal to or lower than the first set temperature and higher than the second set temperature, the controller 800 controls the first pump 210 and the second pump 220 to be all activated, and controls the opening degree of the flow control valve 500 to be decreased as the temperature detected by the temperature sensor decreases without fully opening the flow control valve. At this time, the opening degree of the flow control valve 500 should obviously ensure that the flow rate of the cooling water is greater than the flow rate when only the first pump 210 is started and the flow control valve 500 is fully opened. This is because, even if the opening degree of the flow control valve 500 is reduced, the cooling requirement needs to be satisfied so that each electronic component of the wind turbine generator system 1 operates normally.

Also, the second set temperature is less than the first set temperature, and preferably, the second set temperature may be 20 ℃. The reason for setting the second set temperature is similar to that for setting the first set temperature, that is, when the external ambient temperature is equal to or lower than the first set temperature (e.g., 30 ℃) and higher than the second set temperature (e.g., higher than 20 ℃), the cooling effect (i.e., heat dissipation effect) of the external heat sink is relatively general, and when the external ambient temperature is equal to or lower than the second set temperature, the cooling effect of the external heat sink is relatively good. In the following description, the second set temperature also has the meaning as above.

In the above, the case where the first set temperature is 30 ℃ and the second set temperature is 20 ℃ has been exemplified, however, the present invention is not limited thereto, and the first set temperature and the second set temperature may be set to be different depending on different places.

When the wind speed detected by the wind speed sensor 700 is equal to or higher than the full-wind condition of the wind turbine generator system and the temperature detected by the temperature sensor 600 is equal to or lower than the second set temperature, the controller 800 starts the first pump 210 and stops the second pump 220, and fully opens the opening of the flow control valve 500.

When the wind speed detected by the wind speed sensor 700 is not equal to or higher than the predetermined wind speed and the temperature detected by the temperature sensor 600 is higher than the first set temperature, the controller 800 controls the first pump 210 and the second pump 220 to be all activated, and the opening degree of the flow control valve 500 is decreased as the wind speed decreases without being fully opened. At this time, the opening degree of the flow control valve 500 should obviously ensure that the flow rate of the cooling water is greater than the flow rate when only the first pump 210 is started and the flow control valve 500 is fully opened. This is because, even if the opening degree of the flow control valve 500 is reduced, the cooling requirement needs to be satisfied so that each electronic component of the wind turbine generator system 1 operates normally.

When the wind speed detected by the wind speed sensor 700 is lower than the predetermined wind speed without reaching the full-load condition of the wind turbine generator system and the temperature detected by the temperature sensor 600 is higher than the first set temperature, the controller 800 starts the first pump 210 and stops the second pump 220, and the opening degree of the flow control valve 500 is fully opened.

The predetermined wind speed is preferably a wind speed in the range of one third to one half of the rated wind speed of the wind park. The reason why such a predetermined wind speed is set is that, when the wind speed is equal to or lower than the predetermined wind speed, the first pump 210 is started and the flow control valve 500 is fully opened, so that the cooling requirement of the wind turbine generator can be satisfied, and each electronic component of the wind turbine generator 1 can be normally operated.

In an embodiment of the present invention, the operating states of the first pump 210, the second pump 210 and the flow control valve 500 corresponding to the above conditions of temperature and wind speed can be referred to in table 1 below.

TABLE 1

In addition to the above cases, for example, a case where the temperature of the external environment is 20 to 30 ℃ and the wind speed is between the full condition and the predetermined wind speed, a case where the temperature is 20 to 30 ℃ and the wind speed is lower than the predetermined wind speed, a case where the temperature is lower than 20 ℃ and the wind speed is between the full condition and the predetermined wind speed, a case where the temperature is lower than 20 ℃ and the wind speed is lower than the predetermined wind speed, and the like, since it is necessary to secure the cooling effect, it is necessary to always open the large pump and fully open the flow control valve.

As described above, according to the cooling system of an embodiment of the present invention, when the wind speed or temperature drops less, the flow rate of the cooling water needs to be reduced less, so the flow rate of the cooling water is controlled by the valve. When the flow rate of the cooling water needs to be reduced greatly and the driving force of one pump can be satisfied, the other pump is stopped.

An embodiment of the present invention further provides a cooling method for a wind turbine generator system, including the following steps: the temperature of the external environment is detected by the temperature sensor 600, and the wind speed of the external environment is detected by the wind speed sensor 700; the controller 800 controls the opening degree of the flow control valve 500 and the start and stop of the pump 200 by the temperature of the external environment detected by the temperature sensor 600 and the wind speed detected by the wind speed sensor 700.

Specific examples of how the controller 800 controls the opening degree of the flow control valve 500 and the start and stop of the pump are described in detail when describing the cooling system of the wind turbine generator system, and therefore, will not be described in detail.

Hereinafter, the position of the external heat sink will be described in detail.

In the past, the external heat sink 300 was generally disposed at the rear end of the hub 30,

fig. 3 is a schematic view for illustrating a position of an external heat sink according to an embodiment of the present invention, and fig. 4 is a schematic view for illustrating a position of an external heat sink according to another embodiment of the present invention.

As shown in fig. 3, an external heat sink 300 is installed on the front end wall surface of the hub 40 to eliminate the attenuation of the air velocity caused by the disturbance of the air flow by the front end rotary blades 41, thereby securing the heat dissipation amount. If the external heat sink 300 is moved from the rear end of the hub 30 to the front end of the hub 30, the reduction in the air velocity caused by the disturbance of the airflow by the front-end rotating blades 41 is eliminated, and the heat dissipation amount is increased, the use of a fan or the like as an active heat sink can be reduced, and the power consumption can be reduced.

Further, as shown in FIG. 4, an external heat sink 300 is mounted to a side wall surface of the upper end portion of the tower 10 around the tower 10. Further, a maintenance platform 900 is provided below the external heat sink 300 to facilitate maintenance by a worker. The design can continuously increase the number and the size of the radiating fins of the external radiator 300 according to requirements, and is not limited by the space position, because the external radiator 300 is attached to the wall surface of the tower 10, the installation is firmer, and the influence of typhoon on the radiator can be reduced.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A cooling system of a wind turbine generator system, comprising:

a cooling water supply unit (100) for supplying cooling water;

a pump (200) pumping the cooling water supplied from the cooling water supply unit (100);

an external radiator (300) for heat-exchanging the cooling water heat-exchanged with an internal heat source of the wind turbine generator set with air of an external environment;

the cooling water pipe is used for circulating and flowing the cooling water;

a flow control valve (500) provided in the cooling water pipe for controlling the flow rate of the cooling water pumped by the pump (200);

a temperature sensor (600) for detecting a temperature of an external environment;

a wind speed sensor (700) for detecting a wind speed of an external environment;

and the controller (800) controls the opening degree of the flow control valve (500) and the starting and stopping of the pump according to the temperature of the external environment detected by the temperature sensor (600) and the wind speed detected by the wind speed sensor (700), and based on the comparison result of the wind speed detected by the wind speed sensor (700) and the full-open condition of the wind generating set and the comparison result of the temperature of the external environment detected by the temperature sensor (600) and the set temperature.

2. The cooling system of a wind turbine generator set according to claim 1,

the pump (200) comprises a first pump (210) and a second pump (220), and the power of the first pump (210) for pumping cooling water is larger than that of the second pump (220).

3. The cooling system of a wind turbine generator set according to claim 2,

and when the wind speed detected by the wind speed sensor (700) reaches or is higher than the full condition of the wind generating set and the temperature detected by the temperature sensor (600) is higher than a first set temperature, the controller (800) controls the first pump (210) and the second pump (220) to be started completely and the opening degree of the flow control valve (500) to be fully opened.

4. The cooling system of a wind turbine generator set according to claim 2,

when the wind speed detected by the wind speed sensor (700) reaches or exceeds a full-load condition of the wind turbine generator system and the temperature detected by the temperature sensor (600) is equal to or lower than a first set temperature and is higher than a second set temperature, the controller (800) controls the first pump (210) and the second pump (220) to be all started and the opening degree of the flow control valve (500) to be reduced along with the reduction of the temperature detected by the temperature sensor (600).

5. The cooling system of a wind turbine generator set according to claim 2,

and when the wind speed detected by the wind speed sensor (700) reaches or is higher than the full-load condition of the wind generating set and the temperature detected by the temperature sensor (600) is lower than or equal to a second set temperature, the controller (800) starts the first pump (210), stops the second pump (220) and fully opens the opening of the flow control valve (500).

6. The cooling system of a wind turbine generator set according to claim 2,

when the wind speed detected by the wind speed sensor (700) does not reach the full wind speed of the wind turbine generator and is equal to or higher than a predetermined wind speed, and the temperature detected by the temperature sensor (600) is higher than a first set temperature, the controller (800) controls the first pump (210) and the second pump (220) to be all started, and the opening degree of the flow control valve (500) is reduced along with the reduction of the wind speed.

7. The cooling system of a wind turbine generator set according to claim 2,

when the wind speed detected by the wind speed sensor (700) does not reach the full condition of the wind turbine generator set and is lower than the preset wind speed, and the temperature detected by the temperature sensor (600) is higher than a first set temperature, the controller (800) controls the first pump (210) to be started and the second pump (220) to be stopped, and the opening degree of the flow control valve (500) to be fully opened.

8. Cooling system of a wind park according to claim 6 or 7,

9. The cooling system of a wind power plant of claim 1, said wind power plant comprising: a tower (10); a nacelle (20) located atop the tower (10); a generator (30) located at a forward end of the nacelle (20); a hub (40) located at the front end of the generator (30) and having a plurality of blades (41) mounted thereon,

characterized in that the external heat sink (300) is mounted on the front end wall surface of the hub (40).

10. The cooling system of a wind power plant of claim 1, said wind power plant comprising: a tower (10); a nacelle (20) located atop the tower (10); a generator (30) located at a forward end of the nacelle (20); a hub (40) located at the generator front end (30) and fitted with a plurality of blades (41),

characterized in that the external radiator (300) is mounted around the tower (10) on the side wall surface of the upper end of the tower (10).

11. The cooling system of a wind turbine generator set according to claim 10,

a maintenance platform (900) is provided on the lower portion of the external radiator (300), and the maintenance platform (900) is fixed to the tower (20) so as to surround the tower.

12. A wind park according to any of claims 1-11, characterized by a cooling system of a wind park.

13. A method of cooling a wind park, the wind park comprising a cooling system comprising: a cooling water supply unit (100) for supplying cooling water; a pump pumping the cooling water provided by the cooling water supply unit (100); an external radiator (300) for heat-exchanging the cooling water heat-exchanged with an internal heat source of the wind turbine generator set with air of an external environment; the cooling water pipe is used for circulating and flowing the cooling water; a flow control valve (500) provided in the cooling water pipe for controlling the flow rate of the cooling water pumped by the pump, characterized by comprising the steps of:

detecting the temperature of the external environment by a temperature sensor (600), and detecting the wind speed of the external environment by a wind speed sensor (700);

the controller (800) controls the opening degree of the flow control valve (500) and the start and stop of the pump through the temperature of the external environment detected by the temperature sensor (600) and the wind speed detected by the wind speed sensor (700) and based on the comparison result of the wind speed detected by the wind speed sensor (700) and the full-power condition of the wind generating set and the comparison result of the temperature of the external environment detected by the temperature sensor (600) and the set temperature.

14. The method of cooling a wind turbine generator set according to claim 13,

the pump comprises a first pump (210) and a second pump (220), and the power of the first pump (210) for pumping cooling water is larger than that of the second pump (220).

15. The method of cooling a wind turbine generator set according to claim 14,

16. The method of cooling a wind turbine generator set according to claim 14,

17. The method of cooling a wind turbine generator set according to claim 14,

18. The method of cooling a wind turbine generator set according to claim 14,

19. The method of cooling a wind turbine generator set according to claim 14,

20. The cooling method of a wind turbine generator set according to claim 18 or 19,