Slip ring chamber ventilation control method and system, offshore doubly-fed generator and storage medium

Abstract

The invention discloses a slip ring chamber ventilation control method and system, an offshore doubly-fed generator and a storage medium, and relates to the technical field of wind power generation, the slip ring chamber ventilation control method is suitable for the slip ring chamber ventilation control system of the offshore doubly-fed generator, and the slip ring chamber ventilation control system comprises a slip ring chamber and an air supply pipeline communicated with an air inlet of the slip ring chamber; unit filter cotton and a cooling fan are sequentially arranged in the air supply pipeline in the air flowing direction. The slip ring chamber ventilation control method comprises the steps that the temperature value in a slip ring chamber and the pressure difference value before and after air flows through the unit filter cotton are obtained; when it is judged that the temperature value is larger than the threshold temperature of the slip ring chamber and / or the pressure difference value exceeds the preset pressure difference range, a unit shutdown instruction is triggered; if not, a unit continuous operation instruction is triggered; and controlling the cooling fan to stop or operate according to the unit stop instruction or the unit continuous operation instruction. A large amount of heat generated by working of the electric slip ring is conducted out through the gas, and meanwhile the corrosion problem of the gas to components in the slip ring chamber is reduced.

Description

Technical Field

[0001] This invention relates to the field of wind power generation technology, and in particular to a method and system for controlling ventilation in a slip ring chamber, an offshore doubly-fed generator, and a storage medium. Background Technology

[0002] Doubly-fed induction generators (DFIGs) are widely used in the wind power industry due to their cost-effectiveness. As a wound-rotor asynchronous motor, the rotor windings of a DFIG are connected to the outside via slip rings and carbon brushes. During operation, friction between the carbon brushes and slip rings inevitably generates carbon dust. The marine environment is unique, with high humidity, high salinity (frequent salt spray), and the presence of rain. To prevent salt spray corrosion, the nacelle needs to be completely isolated from the external environment. In this context, if the slip ring system is cooled directly by external airflow, it may lead to salt spray corrosion of the slip ring system and even internal components. Meanwhile, internal airflow poses a risk of carbon dust leakage. Therefore, the cooling and carbon removal problems of the slip ring system in offshore DFIGs are particularly challenging.

[0003] Therefore, how to dissipate the large amount of heat generated by the operation of the slip ring while reducing the corrosion of the components inside the slip ring chamber by the gas is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0004] The purpose of this invention is to provide a method, system, offshore doubly-fed generator, and storage medium for ventilation control of slip ring chambers, which can remove the large amount of heat generated by the operation of the electric slip ring while reducing the corrosion of components inside the slip ring chamber by the gas.

[0005] To achieve the above objectives, the present invention provides a slip ring chamber ventilation control method, applicable to the slip ring chamber ventilation control system of an offshore doubly-fed generator. The slip ring chamber ventilation control system includes a slip ring chamber and an air supply duct connected to the air inlet of the slip ring chamber. A unit filter and a cooling fan are sequentially arranged in the air supply duct along the gas flow direction. The slip ring chamber ventilation control method includes:

[0006] Obtain the temperature value inside the slip ring chamber and the pressure difference value before and after the gas flows through the unit's filter cotton;

[0007] If the temperature value is found to be greater than the threshold temperature of the slip ring chamber and / or the differential pressure value is found to be greater than the preset differential pressure range, a unit shutdown command is triggered; otherwise, a unit continuous operation command is triggered.

[0008] Control the cooling fans to stop or start according to the unit shutdown command or the unit continuous operation command.

[0009] In one possible implementation, a temperature sensing element is provided in the slip ring chamber, and a first differential pressure sensor and a second differential pressure sensor are respectively provided before and after the filter cotton of the unit along the gas flow direction.

[0010] The specific steps for obtaining the temperature value inside the slip ring chamber and the pressure difference value before and after the gas flows through the unit's filter cotton are as follows:

[0011] Obtain the real-time temperature value of the temperature sensing element;

[0012] Obtain the real-time pressure values ​​of the first differential pressure sensor and the second differential pressure sensor, and calculate the pressure difference between the two sensors.

[0013] In one possible implementation, a unit shutdown command is triggered when the temperature value is determined to be greater than the threshold temperature of the slip ring chamber and / or the differential pressure value exceeds a preset differential pressure range; otherwise, the step of triggering a unit continuous operation command further includes:

[0014] Determine whether the differential pressure value is greater than the warning differential pressure value; wherein, the warning differential pressure value is a fixed value and is within the preset differential pressure range;

[0015] When the differential pressure value exceeds the warning differential pressure value, a warning signal is triggered.

[0016] In one possible implementation, the steps of controlling the cooling fan to stop or start according to a unit shutdown command or a unit continuous operation command are as follows:

[0017] When a command to keep the unit running is received, the cooling fan is controlled to run continuously.

[0018] When a unit shutdown command is received, the cooling fan is controlled to stop after a preset running time.

[0019] In one possible implementation, the ventilation control system for the slip ring chamber of the offshore doubly fed generator also includes an air outlet duct connected to the air outlet of the slip ring chamber, and the air outlet duct is equipped with a damper.

[0020] The step of controlling the cooling fan to stop after a preset time when a unit shutdown command is received also includes:

[0021] After receiving the cooling fan stop signal, the control damper closes after a first fixed time interval.

[0022] In one possible implementation, a heater is also provided in the slip ring chamber;

[0023] After receiving the cooling fan stop signal and controlling the damper to close after a first fixed time interval, the process also includes:

[0024] After receiving the air damper closing signal, the heater is started to heat the system after a second fixed time interval.

[0025] In one possible implementation, the steps of obtaining the temperature value inside the slip ring chamber and the pressure difference value before and after the gas flows through the unit's filter cotton further include:

[0026] Turn off the heater;

[0027] Control the air damper to open;

[0028] Control the operation of the cooling fan.

[0029] Based on the above, this application provides a slip ring chamber ventilation control system, including a slip ring chamber and an air supply duct connected to the air inlet of the slip ring chamber. A unit filter and a cooling fan are sequentially arranged inside the air supply duct along the gas flow direction. The slip ring chamber ventilation control system includes:

[0030] Acquisition Unit: Used to acquire the temperature value inside the slip ring chamber and the pressure difference value before and after the gas flows through the unit's filter cotton;

[0031] Judgment Unit: Used to determine whether a unit shutdown command is triggered when the temperature value exceeds the threshold temperature of the slip ring chamber and / or the differential pressure value exceeds the preset differential pressure range; otherwise, a unit continuous operation command is triggered.

[0032] Control unit: Used to control the cooling fan to stop or start according to the unit shutdown command or the unit continuous operation command.

[0033] Based on the above, this application provides an offshore doubly-fed generator, including a memory and a processor. The memory stores a computer program, and when the processor calls the computer program in the memory, it implements the steps of the slip ring chamber ventilation control method as described in any of the above embodiments.

[0034] Furthermore, based on the above, this application provides a storage medium storing computer-executable instructions. When the computer-executable instructions are loaded and executed by a processor, they implement the steps of the slip ring chamber ventilation control method as described in any of the above embodiments.

[0035] Compared to existing technologies, the technical solution provided by this invention has at least the following beneficial effects: A unit filter and a cooling fan are sequentially arranged in the air supply duct connected to the air inlet of the slip ring chamber along the gas flow direction. Gas is filtered by the unit filter and then delivered to the slip ring chamber by the cooling fan for cooling. The unit filter can dehumidify and filter the air with salt spray. When the temperature inside the slip ring chamber exceeds the threshold temperature and / or the pressure difference before and after the gas flows through the unit filter exceeds a preset pressure difference range, a unit shutdown command is triggered, controlling the cooling fan to stop. This prevents the unit filter from being damaged, allowing air to enter the slip ring chamber without filtration, thus avoiding corrosion of components inside the slip ring chamber. Conversely, when the temperature inside the slip ring chamber is below the threshold temperature and the pressure difference before and after the gas flows through the unit filter is within a preset pressure difference range, a unit continuous operation command is triggered, controlling the cooling fan to operate normally for cooling. This configuration effectively removes the large amount of heat generated by the electric slip ring while reducing corrosion of components inside the slip ring chamber. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the structure of the slip ring chamber ventilation control system provided in an embodiment of the present invention;

[0038] Figure 2 This is a schematic diagram of the air supply duct provided in an embodiment of the present invention;

[0039] Figure 3 This is a schematic diagram of the slip ring chamber provided in an embodiment of the present invention;

[0040] Figure 4 A flowchart of the slip ring chamber ventilation control system provided in an embodiment of the present invention;

[0041] Figure 5 This is a flowchart of a slip ring chamber ventilation control method provided in an embodiment of the present invention.

[0042] in:

[0043] 1-Air supply duct; 2-Slip ring chamber; 3-Ventilation hose; 4-Control module; 11-Air inlet of air supply duct; 12-Gas-liquid separation device; 13-First filter; 14-Second filter; 15-Cooling fan; 16-Second differential pressure sensor; 17-First differential pressure sensor; 21-Air outlet duct; 22-Slip ring brush holder system; 23-Temperature measuring element; 24-Heater; 25-Air damper. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0046] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left" and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the position or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations of this invention.

[0047] The purpose of this invention is to provide a method, system, offshore doubly-fed generator, and storage medium for ventilation control of slip ring chambers, which can remove the large amount of heat generated by the operation of the electric slip ring while reducing the corrosion of components inside the slip ring chamber by the gas.

[0048] Please see Figures 1 to 5 To achieve the above objectives, this invention provides a slip ring chamber ventilation control method applicable to the slip ring chamber ventilation control system of an offshore doubly-fed generator. The slip ring chamber ventilation control system includes a slip ring chamber 2 and an air supply duct 1 connected to the air inlet of the slip ring chamber 2. A slip ring brush holder system 22 is provided inside the slip ring chamber 2. Unit filter cotton and a cooling fan 15 are sequentially arranged along the gas flow direction inside the air supply duct 1. The unit filter cotton includes a first filter 13 and a second filter 14, which are arranged sequentially along the gas flow direction. The first filter 13 can be, but is not limited to, a G4 salt spray filter, and the second filter 14 can be, but is not limited to, an E10 salt spray filter. A gas-liquid separator 12 is also provided at the air inlet 11 of the duct. The air inlet 11 of the air supply duct extends to the outside of the cabin to draw in outside air. A ventilation hose 3 is provided between the air outlet of the air supply duct 1 and the air inlet of the slip ring chamber 2. After the gas enters the air supply duct 1 through the gas-liquid separator 12, it is filtered by the first filter 13 and the second filter 14 and then enters the air inlet of the cooling fan 15. After that, it is discharged into the ventilation hose 3 through the air outlet of the cooling fan 15 and then enters the slip ring chamber 2 to cool the components inside the slip ring chamber 2. This process is used to cool down the slip ring chamber 2 and can also remove carbon powder from the slip ring chamber 2. The entire process is isolated from the air inside the cabin.

[0049] The slip ring chamber ventilation control method includes steps S100-S300. Step S100: Obtain the temperature value inside the slip ring chamber 2 and the pressure difference value before and after the gas flows through the unit's filter cotton; Step S200: Determine if the temperature value is greater than the threshold temperature of the slip ring chamber 2 and / or the pressure difference value exceeds the preset pressure difference range, triggering a unit shutdown command; otherwise, triggering a unit continuous operation command; Step S300: Control the cooling fan 15 to stop or start according to the unit shutdown command or the unit continuous operation command. The threshold temperature of the slip ring chamber 2 is experimentally measured. When the temperature value of the slip ring chamber 2 is greater than the threshold temperature, it indicates that the heat dissipation of the slip ring chamber 2 has not been significantly improved, meaning that the slip ring chamber ventilation control system is not operating normally. The preset pressure difference range has a maximum value Pmax and a minimum value Pmin, and the pressure difference value ΔP satisfies... or When this occurs, a unit shutdown command is triggered, and the differential pressure ΔP typically increases with the increase in the dust holding capacity of the first filter 13 and the second filter 14. This indicates that the first filter 13 and the second filter 14 are not effectively blocking the gas. For example, if the first filter 13 and the second filter 14 are deformed, or if there are gaps between the first filter 13 and the second filter 14 and the mounting bracket, gas may enter the unit's filter cotton without being filtered by the first filter 13 and the second filter 14. If the first filter 13 and the second filter 14 block too much gas, it may be due to blockage of the first filter 13 and the second filter 14. If impurities block the air inlet of the first filter 13 and the second filter 14, the first filter 13 and the second filter 14 have reached the end of their service life.

[0050] The air supply duct 1, connected to the air inlet of the slip ring chamber 2, is equipped with a unit filter and a cooling fan 15 in sequence along the gas flow direction. After the gas is filtered by the unit filter, it is delivered to the slip ring chamber 2 by the cooling fan 15 for cooling. The unit filter can dehumidify and filter the air with salt spray. When the temperature in the slip ring chamber 2 is greater than the threshold temperature of the slip ring chamber 2 and / or the pressure difference before and after the gas flows through the unit filter exceeds the preset pressure difference range, a unit shutdown command is triggered, controlling the cooling fan 15 to stop, so as to avoid the unit filter being damaged and causing air to enter the slip ring chamber 2 without being filtered by the unit filter, thus avoiding corrosion of the components in the slip ring chamber 2. When the temperature in the slip ring chamber 2 is less than the threshold temperature of the slip ring chamber 2 and the pressure difference before and after the gas flows through the unit filter is within the preset pressure difference range, a unit continuous operation command is triggered, controlling the cooling fan 15 to operate normally for cooling. This configuration not only removes the large amount of heat generated by the operation of the electric slip ring through gas, but also reduces the corrosion of components inside the slip ring chamber 2 by the gas.

[0051] In one possible implementation, a temperature sensing element 23 is provided in the slip ring chamber 2. A first differential pressure sensor 17 and a second differential pressure sensor 16 are respectively located before and after the unit's filter cotton along the gas flow direction. The steps for obtaining the temperature value inside the slip ring chamber 2 and the differential pressure value before and after the gas flows through the unit's filter cotton specifically involve: obtaining the real-time temperature value of the temperature sensing element 23; obtaining the real-time pressure values ​​of the first differential pressure sensor 17 and the second differential pressure sensor 16, and calculating the differential pressure value between the two sensors. The pressure value at the first differential pressure sensor 17 is greater than the pressure value at the second sensor. The differential pressure value is obtained by the difference between the pressure values ​​at the first differential pressure sensor 17 and the second sensor, and the differential pressure value is used to determine whether the unit's filter cotton is working properly.

[0052] In one possible implementation, a unit shutdown command is triggered when the temperature value is determined to be greater than the threshold temperature of slip ring chamber 2 and / or the differential pressure value exceeds a preset differential pressure range; if not, the step of triggering a unit continuous operation command further includes: determining whether the differential pressure value is greater than the warning differential pressure value Pwarn; wherein, the warning differential pressure value Pwarn is a fixed value, Pwarn is the warning differential pressure value before the dust holding capacity of the salt spray filter is about to reach its upper limit, and the warning differential pressure value Pwarn is within the preset differential pressure range, that is... ,in, ,or When the differential pressure value exceeds the warning differential pressure value, a warning signal is triggered, that is... When a warning signal is triggered, it indicates that the unit's filter cotton needs to be cleaned or replaced.

[0053] In one possible implementation, the step of controlling the cooling fan 15 to stop or start according to the unit shutdown command or the unit continuous operation command specifically includes: controlling the cooling fan 15 to run continuously when the unit continuous operation command is obtained; and controlling the cooling fan 15 to stop after running for a preset time when the unit shutdown command is obtained. The preset time can be set according to actual needs, and is preferably 15 minutes, meaning the cooling fan 15 stops after running for 15 minutes when the unit shutdown command is obtained. In another possible implementation, the specific numerical range of ΔP can also be differentiated according to actual conditions, such as when... When the preset time is short, it can be set to 3 minutes to reduce the total amount of gas entering slip ring chamber 2. When the unit shutdown command is received, the cooling fan 15 is controlled to stop after running for 15 minutes.

[0054] In one possible implementation, the ventilation control system for the slip ring chamber of the offshore doubly-fed generator further includes an air outlet duct 21 connected to the air outlet of the slip ring chamber 2, and the air outlet duct 21 is equipped with a damper 25. After the step of controlling the cooling fan 15 to stop after a preset running time when a unit shutdown command is received, the system further includes: controlling the damper 25 to close after a first fixed time interval following the receipt of the cooling fan 15 shutdown signal. The first fixed time can be set according to actual needs, and is preferably 5 seconds, that is, controlling the damper 25 to close 5 seconds after the receipt of the cooling fan 15 shutdown signal.

[0055] In one possible implementation, a heater 24 is also provided inside the slip ring chamber 2. The heater 24 is located inside the slip ring chamber 2 and is used to heat and dehumidify the interior of the slip ring chamber 2 when the unit is shut down, while ensuring that the air pressure inside the slip ring chamber 2 is greater than the air pressure outside the chamber. After the step of controlling the air damper 25 to close after receiving the shutdown signal of the cooling fan 15 and waiting for a first fixed time interval, the method further includes: starting the heater 24 to heat after receiving the air damper 25 closing signal and waiting for a second fixed time interval. The second fixed time interval can be set according to actual needs, and is preferably 14 minutes and 55 seconds, that is, controlling the heater 24 to start after 14 minutes and 55 seconds after receiving the air damper 25 closing signal.

[0056] In one possible implementation, before obtaining the temperature value inside the slip ring chamber 2 and the pressure difference value before and after the gas flows through the unit's filter cotton, the steps further include: shutting off the heater 24; controlling the air damper 25 to open; and controlling the cooling fan 15 to run. This allows the slip ring chamber ventilation control system to easily transition from the start-up control strategy to the aforementioned operation control strategy, placing the slip ring chamber ventilation control system in operation. All of the above steps are implemented through the control module 4 monitoring feedback signals and sending control signals. For example, information from the first differential pressure sensor 17, the second differential pressure sensor 16, the temperature measurement module, and the opening degree of the air damper 25 are fed back to the control module 4. The control module 4 then makes judgments based on this information and sends corresponding control commands to the cooling fan 15, the air damper 25, and the heater 24.

[0057] The slip ring chamber ventilation control system uses three devices—gas-liquid separator 12, first filter 13, and second filter 14—to dehumidify and filter the outside air from the salt spray environment. This avoids corrosion of the slip ring chamber components and completely isolates the outside and inside air during the process, preventing carbon powder leakage into the chamber. This is of great significance for the application of doubly-fed generators in salt spray environments. The control module 4 continuously acquires the temperature of the slip ring chamber and the pressure difference before and after the filter cotton through the temperature sensing element 23, the first differential pressure sensor 17, and the second differential pressure sensor 16. When the dust holding capacity of the salt spray filter is about to reach its limit, it continuously provides early warnings to replace the first filter 13 and the second filter 14. This enables continuous monitoring and early warning of the operating status of the slip ring chamber 2 fresh air control system of the doubly-fed generator, ensuring the safe and stable operation of the doubly-fed generator.

[0058] Based on the above, this application provides a slip ring chamber ventilation control system, including a slip ring chamber 2 and an air supply duct 1 connected to the air inlet of the slip ring chamber 2. The air supply duct 1 is provided with unit filter cotton and cooling fan 15 in sequence along the gas flow direction. The slip ring chamber ventilation control system includes an acquisition unit, a judgment unit and a control unit.

[0059] Acquisition Unit: Used to acquire the temperature value inside the slip ring chamber 2 and the pressure difference value before and after the gas flows through the filter cotton of the unit.

[0060] Judgment unit: used to determine whether the temperature value is greater than the threshold temperature of slip ring chamber 2 and / or the differential pressure value exceeds the preset differential pressure range to trigger the unit shutdown command; otherwise, it triggers the unit continuous operation command.

[0061] Control unit: Used to control the cooling fan 15 to stop or start according to the unit shutdown command or the unit continuous operation command.

[0062] Based on the above, this application provides an offshore doubly-fed generator, including a memory and a processor. The memory stores a computer program, and when the processor calls the computer program in the memory, it implements the steps of the slip ring chamber ventilation control method as described in any of the above embodiments.

[0063] Furthermore, based on the above, this application provides a storage medium storing computer-executable instructions. When the computer-executable instructions are loaded and executed by a processor, they implement the steps of the slip ring chamber ventilation control method as described in any of the above embodiments.

[0064] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0065] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0066] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. A method for controlling ventilation in a slip ring chamber, characterized in that, A slip ring chamber ventilation control system for an offshore doubly-fed generator, comprising a slip ring chamber (2) and an air supply duct (1) connected to the air inlet of the slip ring chamber (2), wherein a unit filter and a cooling fan (15) are sequentially arranged in the air supply duct (1) along the gas flow direction, and the slip ring chamber ventilation control method includes: Obtain the temperature value inside the slip ring chamber (2) and the pressure difference value before and after the gas flows through the filter cotton of the unit; If the temperature value is greater than the threshold temperature of the slip ring chamber (2) and / or the differential pressure value exceeds the preset differential pressure range, a unit shutdown command is triggered; otherwise, a unit continuous operation command is triggered. The cooling fan (15) is controlled to stop or run according to the unit shutdown command or the unit continuous operation command.

2. The ventilation control method for a slip ring chamber according to claim 1, characterized in that, The slip ring chamber (2) is equipped with a temperature measuring element (23). Along the gas flow direction, the unit filter cotton is equipped with a first differential pressure sensor (17) and a second differential pressure sensor (16) before and after it. The steps for obtaining the temperature value inside the slip ring chamber (2) and the pressure difference value before and after the gas flows through the filter cotton of the unit are as follows: Obtain the real-time temperature value of the temperature measuring element (23); Obtain the real-time pressure values ​​of the first differential pressure sensor (17) and the second differential pressure sensor (16) and calculate the pressure difference between the first differential pressure sensor (17) and the second differential pressure sensor (16).

3. The ventilation control method for a slip ring chamber according to claim 1, characterized in that, The step of triggering a unit shutdown command when the temperature value is greater than the threshold temperature of the slip ring chamber (2) and / or the differential pressure value exceeds the preset differential pressure range; if not, the step of triggering a unit continuous operation command further includes: Determine whether the differential pressure value is greater than the warning differential pressure value; wherein the warning differential pressure value is a fixed value and is within the preset differential pressure range; When the differential pressure value is greater than the warning differential pressure value, a warning signal is triggered.

4. The ventilation control method for a slip ring chamber according to claim 1, characterized in that, The specific steps of controlling the cooling fan (15) to stop or run according to the unit shutdown command or the unit continuous operation command are as follows: When the unit receives the instruction to continue operating, the cooling fan (15) is controlled to continue operating; When the unit shutdown command is received, the cooling fan (15) is controlled to stop after a preset running time.

5. The ventilation control method for a slip ring chamber according to claim 4, characterized in that, The ventilation control system for the slip ring chamber of the offshore double-fed generator also includes an air outlet duct (21) connected to the air outlet of the slip ring chamber (2), and the air outlet duct (21) is equipped with a damper (25). The step of controlling the cooling fan (15) to stop after a preset running time when the unit shutdown command is received further includes: After receiving the shutdown signal of the cooling fan (15), the damper (25) is controlled to close after a first fixed time interval.

6. The ventilation control method for a slip ring chamber according to claim 5, characterized in that, The slip ring chamber (2) is also equipped with a heater (24); After the step of controlling the air damper (25) to close after obtaining the shutdown signal of the cooling fan (15) and then after a first fixed time interval, the method further includes: After receiving the signal to close the airlock (25), the heater (24) is started to heat the airlock after a second fixed time interval.

7. The ventilation control method for a slip ring chamber according to claim 6, characterized in that, Before the steps of obtaining the temperature value inside the slip ring chamber (2) and the pressure difference value before and after the gas flows through the filter cotton of the unit, the method further includes: Turn off the heater (24); Control the opening of the air damper (25); Control the operation of the cooling fan (15).

8. A slip ring chamber ventilation control system, characterized in that, The system includes a slip ring chamber (2) and an air supply duct (1) connected to the air inlet of the slip ring chamber (2). The air supply duct (1) contains a unit filter and a cooling fan (15) arranged sequentially along the gas flow direction. The slip ring chamber ventilation control system includes: Acquisition unit: used to acquire the temperature value inside the slip ring chamber (2) and the pressure difference value before and after the gas flows through the filter cotton of the unit; Judgment unit: used to determine whether the temperature value is greater than the threshold temperature of the slip ring chamber (2) and / or the pressure difference value exceeds the preset pressure difference range to trigger the unit shutdown command; otherwise, to trigger the unit continuous operation command. Control unit: used to control the cooling fan (15) to stop or run according to the unit shutdown command or the unit continuous operation command.

9. A type of offshore doubly-fed generator, characterized in that, It includes a memory and a processor, wherein the memory stores a computer program, and the processor, when calling the computer program in the memory, implements the steps of the slip ring chamber ventilation control method as described in any one of claims 1 to 7.

10. A storage medium, characterized in that, The storage medium stores computer-executable instructions, which, when loaded and executed by a processor, implement the steps of the slip ring chamber ventilation control method as described in any one of claims 1 to 7.

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