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

Abstract

The invention discloses a cooling system and a cooling method, and a wind power generator set with the cooling system. The cooling system includes: a cooling water supply unit for supplying cooling water; a pump for pumping the cooling water supplied by the cooling water supply unit; and an external radiator for passing the internal heat source of the wind turbine through The heat-exchanged cooling water exchanges heat with the air in the external environment; a cooling water pipe is used for circulating the cooling water; a flow control valve is arranged in the cooling water pipe to control the flow of the cooling water pumped by the pump. flow; temperature sensor for detecting the temperature of the external environment; wind speed sensor for detecting the wind speed of the external environment; controller for controlling the temperature of the external environment detected by the temperature sensor and the wind speed detected by the wind speed sensor The opening of the flow control valve and the start and stop of the pump.

Description

Cooling system, wind turbine with cooling system and cooling method thereof

technical field

The present invention relates to a cooling system, a wind power generator set with the cooling system and a cooling method thereof.

Background technique

Wind turbines are large and complex equipment that is used outdoors for a long time, and their operating status is often affected by environmental factors such as temperature and humidity. In terms of heat dissipation, for internal heat sources with high calorific value, such as converters, generators and frequency converters, some wind power suppliers will give priority to water cooling measures to enhance heat dissipation, while for surface heat sources of general electrical components, more Direct air cooling with fan.

However, these traditional cooling systems are designed for the purpose of cooling the maximum heat output of the entire wind turbine system. That is to say, for the cooling system of the engine room, it is designed according to the maximum heat production of the components of the engine room, but the cooling system has different states when the unit is running and stopped.

However, when the wind speed is low and the wind turbine cannot be fully powered, the heat production of each component of the wind turbine will decrease, but the cooling capacity of the cooling system will remain unchanged, which will not only cause the temperature inside the unit to decrease, Increased humidity 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 powered, the heat production of each component of the wind turbine will decrease, but the cooling capacity of the cooling system will remain unchanged, which will not only cause the temperature inside the unit decrease, increase humidity, and generate unnecessary energy consumption. In the process of switching from the wind speed to the rated wind speed, the power generation of the wind turbine increases first and then remains unchanged (before reaching the full wind speed, the power generation increases with the increase of the wind speed; after reaching the full wind speed, the power generation increases with the wind speed. The heat output of its components also increases first and then remains unchanged, which is not considered by the cooling system.

Of course, some technologies also improve the cooling system, so that the cooling system uses different cooling circuits at different wind speeds. For example, at low wind speeds, in the converter's operating mode, in order to achieve zero reactive power, its output terminals are connected, and because of this operation, the converter generates heat, causing a temperature rise that requires cooling. The cooling circuit at this time is "converter-generator-heat exchanger-converter" to form a circuit. Under normal wind speed (from the cut-in wind speed to the wind speed exceeding the rated wind speed), the cooling system will form two circuits, one is "converter-heat exchanger-converter" and the other is "generator-heat exchanger" -dynamo".

However, the cooling system does not consider the influence of the external ambient temperature on the cooling system. Specifically, the lower the external ambient temperature, the greater the cooling capacity of the external radiator, and the higher the external ambient temperature, the lower the cooling capacity of the external radiator. It can be seen that the external ambient temperature will also have a significant impact on the cooling system. Impact.

In addition, the external radiator of the cooling system is generally placed at the top of the nacelle or at the rear of the nacelle. Due to the speed attenuation caused by the front-end rotating blades disturbing the airflow, the passive cooling wind speed of the external radiator will be lower than the actual wind speed, resulting in a decrease in heat dissipation. Moreover, with the increase in the size of the wind turbine, the power generation is increasing, and the heat generation of its components is also increasing. However, due to the limitation of the top position of the nacelle, the windward area of the external radiator has an upper limit, that is, the cooling There is an upper limit for the quantity. Moreover, the power generation of wind turbines is increasing, and the heat generation is also increasing. For systems that cannot meet the cooling requirements of wind turbines by passive cooling, active cooling devices such as fans will be added to the front of the external radiator. In addition, the external radiator is vulnerable to typhoon damage when it is on top of the nacelle, and its connection to the nacelle wall fails.

SUMMARY OF THE INVENTION

The present invention is proposed to solve the above-mentioned problems, and its object is to provide a cooling system, a wind power generator set with a cooling system and a cooling method thereof, which can realize the wind speed according to the external environment by improving the cooling system. and temperature to control the flow of cooling water, so as to realize the control of the temperature in the wind turbine and achieve the effect of energy saving.

Another object of the present invention is to provide a cooling system, a wind turbine generator with a cooling system and a cooling method thereof, which can increase the amount of heat dissipation by changing the position of the external radiator, and make the number and size of the external radiator different. Limited by the size of the installation space, the number of external radiators can be continuously increased according to the design requirements, the stability of the external radiator installation can be increased, and the influence of typhoon on the radiator can be reduced.

In order to achieve the above object, the cooling system of the wind turbine according to the present invention may include: a cooling water supply unit for supplying cooling water; a pump for pumping the cooling water provided by the cooling water supply unit; an external radiator for supplying cooling water with In order to make the cooling water exchanged with the internal heat source of the wind turbine and the air in the external environment to exchange heat with the air in the external environment; the cooling water pipe is used for circulating the cooling water; the flow control valve is arranged in the cooling water pipe and used for to control the flow of cooling water pumped by the pump; a temperature sensor to detect the temperature of the external environment; a wind speed sensor to detect the wind speed of the external environment; a controller to detect the temperature of the external environment by the temperature sensor The temperature and the wind speed detected by the wind speed sensor control the opening of the flow control valve and the start and stop of the pump.

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

When the wind speed detected by the wind speed sensor reaches or exceeds the full power condition of the wind turbine, and the temperature detected by the temperature sensor is higher than the first set temperature, the controller may control all The first pump and the second pump are all activated and the opening degree of the flow control valve is fully opened.

When the wind speed detected by the wind speed sensor reaches or exceeds the full power condition of the wind turbine, and the temperature detected by the temperature sensor is below the first set temperature and greater than the second set temperature, the control The controller may be controlled such that the first pump and the second pump are all activated, and the opening degree of the flow control valve is decreased as the temperature detected by the temperature sensor decreases.

When the wind speed detected by the wind speed sensor reaches or exceeds the full power condition of the wind turbine, and the temperature detected by the temperature sensor is below the second set temperature, the controller may control the The first pump is started and the second pump is stopped, and the opening of the flow control valve is fully opened.

When the wind speed detected by the wind speed sensor does not reach the full power condition of the wind turbine and is above a predetermined wind speed, and the temperature detected by the temperature sensor is higher than the first set temperature, the controller may control In order to start all of the first pump and the second pump, the opening of the flow control valve is reduced as the wind speed decreases.

When the wind speed detected by the wind speed sensor does not reach the full power condition of the wind turbine and is lower than a predetermined wind speed, and the temperature detected by the temperature sensor is higher than the first set temperature, the controller may control In order to start the first pump and stop the operation of the second pump, the opening degree of the flow control valve is fully opened.

The predetermined wind speed is one of one-third to one-half of the rated wind speed of the wind turbine.

The wind turbine may include: a tower; a nacelle located at the top of the tower; a generator located at the front end of the nacelle; a hub located at the front end of the generator and mounted with a plurality of blades (41), the The external radiator is mounted on the front end wall of the hub, or the external radiator surrounds the tower and is mounted on the side wall of the upper end of the tower.

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

In order to achieve the above objects, the wind power plant according to the present invention may include the cooling system of the wind power plant as described above.

In order to achieve the above object, in the cooling method for a wind turbine according to the present invention, the wind turbine includes a cooling system, and the cooling system includes: a cooling water supply unit for providing cooling water; a pump for pumping the cooling water by the cooling system cooling water provided by a water supply unit; an external radiator for exchanging heat with the air in the external environment between the cooling water that has undergone heat exchange with the internal heat source of the wind turbine; cooling water pipes for circulating the cooling water A flow control valve, arranged in the cooling water pipe, is used to control the flow of the cooling water pumped by the pump, and it is characterized in that, it can include the following steps: the temperature of the external environment is detected by a temperature sensor, and the temperature of the external environment is detected by a wind speed sensor. Wind speed of the external environment; the controller controls the opening of the flow control valve and the start and stop of the pump according to 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 power of the first pump to pump cooling water is greater than that of the second pump.

When the wind speed detected by the wind speed sensor reaches or exceeds the full power condition of the wind turbine, and the temperature detected by the temperature sensor is higher than the first set temperature, the controller may control all The first pump and the second pump are all activated and the opening degree of the flow control valve is fully opened.

When the wind speed detected by the wind speed sensor reaches or exceeds the full power condition of the wind turbine, and the temperature detected by the temperature sensor is below the first set temperature and greater than the second set temperature, the control The controller may be controlled such that the first pump and the second pump are all activated, and the opening degree of the flow control valve is decreased as the temperature detected by the temperature sensor decreases.

When the wind speed detected by the wind speed sensor reaches or exceeds the full power condition of the wind turbine, and the temperature detected by the temperature sensor is below the second set temperature, the controller may control the The first pump is started and the second pump is stopped, and the opening of the flow control valve is fully opened.

When the wind speed detected by the wind speed sensor does not reach the full power condition of the wind turbine and is above a predetermined wind speed, and the temperature detected by the temperature sensor is higher than the first set temperature, the controller may control In order to start all of the first pump and the second pump, the opening of the flow control valve is reduced as the wind speed decreases.

When the wind speed detected by the wind speed sensor does not reach the full power condition of the wind turbine and is lower than a predetermined wind speed, and the temperature detected by the temperature sensor is higher than the first set temperature, the controller may control In order to start the first pump and stop the operation of the second pump, the opening degree of the flow control valve is fully opened.

The predetermined wind speed is one of one-third to one-half of the rated wind speed of the wind turbine.

According to the present invention, since the flow rate of cooling water can be controlled according to the wind speed and temperature of the external environment, the temperature in the wind turbine can be controlled, and the effect of energy saving can be achieved.

Moreover, according to the present invention, the amount of heat dissipation can be increased by changing the position of the external heat sink, and the number and size of the external heat sink are not limited by the size of the installation space, so that the number of external heat sinks can be continuously increased according to design requirements, and It can increase the stability of external radiator installation and reduce the influence of typhoon on the radiator.

Description of drawings

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

FIG. 2 is a block diagram showing a cooling system of a wind turbine according to an embodiment of the present invention;

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

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

Symbol Description:

1: Wind turbine 10: Tower

20: Engine room 30: Generator

40: Hub 41: Blade

100: Cooling water supply unit 200: Pump

210: First pump 220: Second pump

300: External radiator 400: Cooling water pipes

500: Flow control valve 600: Temperature sensor

700: Wind speed sensor 800: Controller

900: Maintenance Platform

Detailed ways

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Advantages and features of the present invention and methods for achieving them will become apparent by reference to the accompanying drawings and the embodiments described in detail. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in different forms from each other, and the present embodiments are only for the purpose of completely disclosing the present invention and fully informing those skilled in the art to which the present invention pertains with ordinary knowledge The scope of the present invention is provided, and the present invention is determined only by the scope described in the claims. Throughout the specification, the same reference numerals denote the same constituent elements.

As shown in FIG. 1 , a wind turbine 1 according to an embodiment of the present invention includes: a tower 10; a nacelle 20, located at the top of 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 a plurality of vanes 41 are attached; and a cooling system to be described later. In addition to the above components, the wind turbine 1 may include a main bearing, a transformer, a pitch system, and various electrical components, etc. These components are well known to those skilled in the art, and thus detailed descriptions thereof are omitted.

Since the generator, main bearing, transformer, pitch system and electrical components of the wind turbine 1 will generate a lot of heat during operation, many electrical components will fail or even explode at high temperatures. Moreover, in the high temperature state, the viscosity of the lubricating oil decreases, and the grease leaks out, causing the failure of the lubricating system. When the wind turbine 1 is shut down, it may be affected by the external low temperature environment, and the water-containing substances such as cooling cabinet liquid will undergo phase change (icing, frosting); the performance stability of electronic devices such as capacitors will decrease; the viscosity of lubricating grease will increase sharply. High, semi-cured, loss of wettability, unable to form an oil film, and eventually make the lubrication system ineffective.

Therefore, the wind turbine 1 generally has more than one temperature control system (such as a tower bottom temperature control system and a nacelle temperature control system), which are used to control the temperature of components such as generators, main bearings, and converters. Here, components such as generators, main bearings, converters, and frequency converters that generate heat during operation of the wind turbine may be referred to as internal heat sources of the wind turbine 1 .

The temperature control system is the equivalent of the cooling system in the case of wind turbine 1 operation, since its components generate a large amount of heat during operation of the wind turbine (ie, the internal heat source of the wind turbine 1 generates heat), whereas To ensure the longevity and efficiency of the various components, the heat generated needs to be removed to the external environment. When the wind turbine is in a severe cold environment and is in a shutdown state, it is necessary to heat the environment inside the wind turbine.

The present invention mainly studies the cooling system, and the medium in the system is water or other liquids.

Hereinafter, a cooling system for a wind turbine 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 according to an embodiment of the present invention.

As shown in FIG. 2 , a cooling system for a wind turbine according to an embodiment of the present invention includes: a cooling water supply unit 100 for providing cooling water; a pump 200 for pumping the cooling water provided by the cooling water supply unit 100; an external The radiator 300 is used to make the cooling water exchanged with the internal heat source of the wind turbine 1 and the air of the external environment to perform heat exchange; the cooling water pipe 400 is used for circulating the cooling water; the flow control valve 500 is arranged in the cooling water pipe 400, Used to control the flow rate of the cooling water pumped by the pump 200; the temperature sensor 600 is used to detect the temperature of the external environment; the wind speed sensor 700 is used to detect the wind speed of the 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 above-mentioned cooling water pipe 400 as long as the pump 200 can be controlled The flow rate of the cooling water sent is sufficient. The cooling water pipe only needs to circulate the cooling water in the cooling system, but the cooling water pipe preferably circulates the cooling water in the order of the cooling water supply unit 100 , the pump 200 , and the external radiator 300 .

Before the wind turbine 1 reaches the full state, the power generation of the wind turbine 1 will increase with the increase of the wind speed, and the heat production of its internal heat source will be greater; when the wind turbine 1 reaches the full state, the power generation The amount does not change with the increase of the wind speed, that is, the heat production of the internal heat source does not increase any more. According to the principle of heat transfer, the higher the external ambient temperature, the smaller the temperature difference between the cooling water and the external environment, and the smaller the heat dissipation of the radiator. Therefore, the flow rate of cooling water should be 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 also factors that affect the amount of heat dissipation.

To this end, the cooling system for a wind turbine according to an embodiment of the present invention further includes a controller 800, which controls the opening of the flow control valve 500 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 start and stop of the pump 200. Accordingly, the flow rate of cooling water can be controlled according to the wind speed and temperature of the external environment, so that the temperature in the wind turbine can be controlled, and the effect of energy saving can be achieved at the same time.

Here, the pump 200 may include a first pump 210 and a second pump 220 , and the power of the first pump 210 for pumping cooling water is greater than that of the second pump 220 . Accordingly, the cooling system of the present invention includes two pumps, so that the driving force of one pump can satisfy the required cooling effect without requiring a large cooling water flow rate, so that one pump is stopped and the other pump is stopped. operation, so as to achieve the effect of energy saving. Here, if the wind turbine is running, it is considered that a relatively large cooling is required, so the pump that is continuously running is preferably the first pump 210 under normal circumstances.

Moreover, in a preferred embodiment, when the wind speed detected by the wind speed sensor 700 reaches or exceeds the full power condition of the wind turbine 1, and the temperature detected by the temperature sensor 600 is higher than the first set temperature, the controller 800 is controlled so that the first pump 210 and the second pump 220 are all activated and the opening degree of the flow control valve 500 is fully opened. Accordingly, the flow rate of the cooling water is controlled to be the maximum so as to satisfy the required cooling effect.

Here, the first set temperature refers to a relatively high external ambient temperature, for example, the first set temperature may be 30°C. The reason for setting the first set temperature is that when the external ambient temperature is higher than the first set temperature (for example, higher than 30° C.), the cooling effect (ie, the heat dissipation effect) of the external heat sink is relatively poor, while When the external ambient temperature is below the first set temperature, the cooling effect of the external heat sink is relatively general or relatively good. In the following description, the first set temperature also has the same meaning as above.

Moreover, when the wind speed detected by the wind speed sensor 700 reaches or exceeds the full power condition of the wind turbine, and the temperature detected by the temperature sensor 600 is lower than the first set temperature and greater than the second set temperature, the controller 800 controls to The first pump 210 and the second pump 220 are all activated, and the opening degree of the flow control valve 500 is not fully opened and decreases as the temperature detected by the temperature sensor decreases. At this time, the opening degree of the flow control valve 500 should obviously ensure that the flow rate of cooling water is greater than the flow rate when only the first pump 210 is activated 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 the various electronic components of the wind turbine generator 1 can work normally.

Moreover, the second set temperature is lower than the first set temperature, and preferably, the second set temperature may be 20°C. The reason for setting the second set temperature is similar to the reason for setting the first set temperature, that is, the external ambient temperature is below the first set temperature (eg, 30° C.) and higher than the second set temperature (eg, higher than 20° C.), the cooling effect (ie, heat dissipation effect) of the external radiator is relatively general, and when the external ambient temperature is below the second set temperature, the cooling effect of the external radiator is relatively good. In the following description, the second set temperature also has the same meaning as above.

In the above, the case where the first set temperature is 30°C and the second set temperature is 20°C is exemplified. However, the present invention is not limited to this, and the first set temperature and the second set temperature can be determined according to different locations. and set to be different.

Furthermore, when the wind speed detected by the wind speed sensor 700 reaches or exceeds the full power condition of the wind turbine, and the temperature detected by the temperature sensor 600 is below the second set temperature, the controller 800 controls the first pump 210 to start and The operation of the second pump 220 is stopped, and the opening degree of the flow control valve 500 is fully opened.

Moreover, when the wind speed detected by the wind speed sensor 700 does not reach the full power condition of the wind turbine and is 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 The pump 210 and the second pump 220 are all activated, and the opening degree of the flow control valve 500 is not fully opened and decreases as the wind speed decreases. At this time, the opening degree of the flow control valve 500 should obviously ensure that the flow rate of cooling water is greater than the flow rate when only the first pump 210 is activated 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 the various electronic components of the wind turbine generator 1 can work normally.

In addition, when the wind speed detected by the wind speed sensor 700 does not reach the full power condition of the wind turbine and is lower 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 The pump 210 is started and the operation of the second pump 220 is stopped, and the opening degree of the flow control valve 500 is fully opened.

The predetermined wind speed is preferably one of one third to one half of the rated wind speed of the wind turbine. The reason for setting such a predetermined wind speed is that when the predetermined wind speed is below the predetermined wind speed, as long as the first pump 210 is started and the flow control valve 500 is fully opened, the cooling requirements of the wind turbine can be met, and the electronic components of the wind turbine 1 can be normalized. Work.

In an embodiment of the present invention, for the working states of the first pump 210 , the second pump 210 and the flow control valve 500 corresponding to various conditions of the above temperature and wind speed, please refer to Table 1 below.

Table 1

In addition to the above cases, for example, the case where the temperature of the external environment is 20°C to 30°C and the wind speed is between the full power condition and the predetermined wind speed, the case where the temperature is 20°C to 30°C and the wind speed is lower than the predetermined wind speed , the case where the temperature is lower than 20°C and the wind speed is between the full power condition and the predetermined wind speed, the case where the temperature is lower than 20°C and the wind speed is lower than the predetermined wind speed, etc., due to the need to ensure the cooling effect, it is necessary to keep the large pump turned on, 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 drop is small, the flow rate of the cooling water needs to be reduced slightly, so the flow rate of the cooling water is controlled by the valve. When the flow of cooling water needs to be greatly reduced, and the driving force of one pump can meet the requirements, the other pump is stopped.

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

A specific example of how the controller 800 controls the opening degree of the flow control valve 500 and the start and stop of the pump has already been described in detail when describing the cooling system of the wind turbine, and therefore will not be described in detail.

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

Conventionally, the external radiator 300 is usually provided at the rear end of the hub 30,

FIG. 3 is a schematic diagram 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 , the external radiator 300 is installed on the front end wall of the hub 40 to eliminate the attenuation of air velocity caused by the front end rotating blade 41 disturbing the airflow, thereby ensuring the heat dissipation. If the external radiator 300 is moved from the rear end of the wheel hub 30 to the front end of the wheel hub 30, the attenuation of the air speed caused by the disturbance of the airflow caused by the front-end rotating blades 41 is eliminated, and the heat dissipation is increased, thereby reducing the use of equipment such as fans as active cooling devices. , thereby reducing energy consumption.

Furthermore, as shown in FIG. 4 , the external radiator 300 is attached to the side wall surface of the upper end of the tower 10 to surround the tower 10 . In addition, a maintenance platform 900 is provided at the lower part of the external radiator 300 to facilitate maintenance by the staff. Among them, the design can continuously increase the number and size of the fins of the external radiator 300 according to the requirements, without being limited by the space position, because the external radiator 300 is attached to the wall of the tower 10 to be installed, the installation is relatively firm, and it can reduce the impact of typhoons. effect of the radiator.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be Included within the scope of protection of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (20)

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,

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.

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,

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.

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

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).

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

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).

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

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.

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

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.

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

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.

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