CN115405477A - Wind turbine generator system cabin integrated air-water cooling system and control method - Google Patents

Abstract

The invention discloses a wind turbine engine room integrated air-water cooling system, that is, a control method. The system includes an external radiator and a pipeline. The external radiator includes an external cooling plate, and the pipeline includes an external pipeline. And the pipeline in the cabin, the pipeline in the cabin is connected with a pumping station, the water outlet of the pumping station is provided with a valve body sensor element, the pipeline in the cabin is connected with a generator and a gear box, and the pumping station is connected There is a heater, and the pipeline in the cabin is connected with the pipeline outside the cabin, and the pipeline outside the cabin is connected with the radiator outside the cabin. An integrated air-water cooling system for a wind turbine engine room of the present invention connects the generator and the gear box in series through pipelines, and the radiator outside the cabin adopts natural air cooling, and the generator and the gear box are connected without reducing the manufacturability and reliability Tank cooling is combined into a system, which saves the configuration of pumping stations, optimizes the design of electrical components outside the cabin and pipelines inside the cabin, makes the engine room more compact, and improves the efficiency of the cooling system of the unit.

Description

An integrated air-water cooling system and control method for a wind turbine nacelle

technical field

The invention relates to the technical field of wind power generators, in particular to a wind turbine nacelle integrated air-water cooling system and a control method.

Background technique

As offshore wind power enters the era of grid parity in an all-round way, the pressure of industry competition is gradually increasing, and the MW of a single wind turbine unit continues to rise. To meet the heat dissipation requirements of the engine room, water cooling technology has gradually become the main working method for cooling large-capacity offshore units.

Due to the extremely high airtight requirements of offshore wind turbines, the thermal management of large components of large megawatt wind turbines has become one of the most difficult problems in the development of wind power technology. Efficiently taking the heat generated in the turbine out of the nacelle is the key to improving the reliability of the turbine one. In addition, the requirements of offshore wind turbines are complex, and there are often certain conflicts between the functional requirements of the components. How to organically combine the multi-component structure and satisfy multiple functions at the same time is a test for the current wind turbine design.

In the engine room of a large-megawatt double-fed unit, the main heat production comes from the generator and the gearbox. Centralized control of the heat production of the generator and the gearbox and the reduction of the overall temperature level of the engine room have not yet provided an integrated and efficient solution. Program.

Contents of the invention

The present invention aims to overcome the problem in the prior art that centralized control and processing of heat production of generators and gearboxes can be realized to reduce the overall temperature of the nacelle, and provides an integrated air-water cooling system and control method for the nacelle of a wind turbine.

In order to achieve the above object, the present invention adopts the following technical solutions:

An integrated air-water cooling system for the nacelle of a wind turbine, comprising an outboard radiator and pipelines, the outboard radiator includes outboard radiating plates, the pipelines include outboard pipelines and inboard pipelines, the The pipeline in the cabin is connected with a pumping station, the water outlet of the pumping station is provided with a valve body sensor element, the pipeline in the cabin is connected with a generator and a gear box, the pumping station is connected with a heater, and the inside of the cabin The pipeline is connected with the external pipeline, and the external pipeline is connected with the external radiator. An integrated air-water cooling system for a wind turbine engine room of the present invention connects the generator and the gear box in series through pipelines, and the radiator outside the cabin adopts natural air cooling, and the generator and the gear box are connected without reducing the manufacturability and reliability. Tank cooling is combined into a system, which saves the configuration of pumping stations, optimizes the design of electrical components outside the cabin and pipelines inside the cabin, makes the engine room more compact, and improves the efficiency of the cooling system of the unit.

As a preferred solution of the present invention, the pipeline in the cabin includes a generator installation interface and a gearbox installation interface, the generator installation interface is connected to the generator through the air-water cooler inside the generator, and the gearbox installation interface is connected to the generator through The gear box oil-water heat exchanger is connected with the gear box. The integrated air-water cooling system for the wind turbine engine room of the present invention connects the generator and the gear box in series through pipelines, and the coolant exits from the power unit of the pump station, first passes through the radiator outside the cabin, then passes through the air-water cooling device inside the generator, and finally passes through the The oil-water heat exchanger of the gear box returns to the pump, and the coolant heated by the air-water cooler of the generator is passed into the oil-water heat exchanger of the gear box for step-wise cooling, thereby improving the equipment utilization efficiency of the water-cooling system.

As a preferred solution of the present invention, stop valves are respectively provided at both ends of the generator installation interface and the gearbox installation interface. In the present invention, cut-off valves are provided at the inlets and outlets of the generator and the gearbox of the pipeline in the cabin. When the unit replaces the generator and the gearbox, the valve body can be tightened to prevent the loss of coolant in the water cooling system when the unit replaces the generator and the gearbox.

As a preferred solution of the present invention, a power line duct and a lightning line duct are arranged on the external pipeline, and the power line duct and the lightning line duct are hard pipes. The power line duct and the lightning line duct lead the electrical leads of electrical equipment such as anemometers, small weather station components, aviation warning lights, and lightning protection facilities into the cabin.

As a preferred solution of the present invention, several installation positions are provided on the outer heat dissipation plate, and the installation positions are used to install lightning protection lightning rods, wind measuring equipment and miniature weather stations. There is an aviation light installation interface. The cooling plate outside the cabin adopts the form of natural air cooling, and the wind speed and direction instrument, small weather station components, aviation warning lights, and lightning protection facilities are integrated on the plate, and the electrical wires of the above equipment are connected into the cabin through hard tubes to reduce air pollution. The sheet metal structural parts of the unit can eliminate the influence of the external radiator on the wind measurement system and the unit lightning protection system.

As a preferred solution of the present invention, the system also includes several cabin exhaust valves and some external exhaust valves, the cabin exhaust valves are arranged on the cabin pipeline, and the external exhaust valves are located on on the outer pipe. The exhaust valve in the cabin is set at a relatively high position of the pipeline in the cabin, such as the outlet of the gearbox pipeline and the outlet of the generator pipeline, and the exhaust valve outside the cabin is set at a relatively high position outside the cabin. In the position, prevent the formation of air pockets at the high position, which will affect the flow of coolant, heat exchange and water pump operation.

As a preferred solution of the present invention, the valve body sensor element is a three-way valve sensor element, and the three-way valve sensor element controls the flow direction of the coolant according to the actual temperature of the coolant. The three-way valve sensor element can control whether to heat the cooling liquid and whether to make the cooling liquid pass through the cooling plate outside the cabin according to the actual temperature of the cooling liquid.

As a preferred solution of the present invention, the pipeline in the cabin is fixed by the truss inside the cabin. It can save the configuration of fixed components of the pipeline inside the cabin, optimize the design of the pipeline in the cabin, and make the cabin more compact.

An integrated air-water cooling control method for a wind turbine nacelle, comprising: when the unit is connected to the grid, the pumping station of the water cooling system is started, and at this time, the interface of the sensor element of the three-way valve connected to the radiator outside the cabin is in a closed state, and the coolant does not stop. Flow through the outboard radiator; detect the temperature of the coolant at the outlet of the gearbox, and when the temperature of the coolant at the outlet of the gearbox is ≥ T ₀ ℃, activate the sensor element of the three-way valve so that the sensor element of the three-way valve is connected to the interface of the outboard radiator In the conduction state, the coolant flows through the outboard radiator for cooling; until the coolant temperature at the gearbox outlet is ≤T ₀ -10°C, close the three-way valve sensor element so that the three-way valve sensor element is connected to the outboard radiator. The interface is closed, and the coolant does not flow through the radiator outside the cabin; when the unit is off the grid for n minutes, the pump station of the water cooling system is turned off. The integrated air-water cooling control method of the wind turbine engine room of the present invention adopts the method of starting the pumping station when the unit is connected to the grid, delaying shutdown after disconnecting the grid, and realizing the temperature control of the coolant through the heater and the three-way solenoid valve. For the problem of residual heat dissipation of the gearbox after off-grid, the principle of shutting down the water cooling system for n minutes after off-grid has been formulated. The n value is adjusted according to the actual grid connection time to prevent electricity waste.

As a preferred solution of the present invention, the method further includes: when the unit is in a non-grid-connected state, when the temperature of the coolant at the outlet of the gearbox is ≤ T _h °C, start the pump station of the water cooling system, and start the pump station heater for heating , until the gearbox outlet coolant temperature > T _h +5°C, the heater of the pump station is turned off, and the pump station of the water cooling system is turned off. An integrated air-water cooling control method for a wind turbine nacelle of the present invention adopts the method of starting the pump station when the coolant temperature is low. A strategy to start the pump and heater below T _h .

As a preferred version of the present invention, the method also includes: monitoring the temperature of the oil pool of the gearbox itself, when the temperature of the oil pool of the gearbox itself exceeds T _G , the value of the temperature T ₀ decreases, and the value of T ₀ decreases is N( T _Y -T _G ), where T _Y is the temperature of the oil pool of the gearbox itself, T _G is the preset comparison value, and N is the reduction coefficient. When the temperature of the oil pool of the gearbox itself exceeds the specified value, the three-way solenoid valve of the water cooling system will reduce the switch control temperature according to the temperature difference of the gearbox oil pool temperature exceeding the specified value, so that the heat transfer temperature difference in the oil-water heat exchanger of the gearbox will be increased and enhanced. heat exchange. This working condition occurs when the power of the gearbox suddenly increases, and the water cooling system is controlled to dissipate heat in advance to prevent thermal shock.

As a preferred solution of the present invention, the method also includes: monitoring the pressure value of the water inlet and/or water outlet coolant of the generator and/or the gearbox in real time, when the water inlet and/or water outlet of the generator and/or the gearbox When the pressure value of the coolant at the water outlet is lower than P ₁ , the system will give a warning prompt, and when the pressure value of the coolant at the water inlet and/or water outlet of the generator and/or gearbox is lower than P ₂ , the water cooling system pump station closure. The present invention adopts a secondary protection strategy for the return water pressure of the system. When it is lower than the set value P ₁ , it will only alarm, and when it is lower than the set value P ₂ , it will perform shutdown protection, so as to distinguish the response to different types of faults.

Therefore, the present invention has the following beneficial effects: In the integrated air-water cooling system of a wind turbine engine room of the present invention, the generator and the gear box are connected in series through pipelines, and the outdoor radiator adopts natural air cooling, so that the manufacturability and reliability are not reduced. Under the premise of combining the cooling of the generator and the gearbox into a set of systems, the configuration of the pumping station is saved, the design of the electrical parts outside the cabin and the piping in the cabin is more optimized, the cabin is more compact, and the efficiency of the cooling system of the unit is improved; An integrated air-water cooling control method for the wind turbine nacelle. The pump station is started when the unit is connected to the grid, and it is shut down after a delay after being disconnected from the grid. The temperature control of the coolant is realized through the heater and the three-way solenoid valve. For the problem of residual heat dissipation after off-grid, the principle of shutting down the water cooling system after n minutes after off-grid has been formulated. The n value is adjusted according to the actual grid connection time to prevent electricity waste.

Description of drawings

Fig. 1 is a system pipeline connection structural diagram of the present invention;

Fig. 2 is a structural schematic diagram of an outboard radiator of the present invention;

Fig. 3 is a structural schematic diagram of the extracabin pipeline of the present invention;

Fig. 4 is a schematic diagram of the pipeline structure in the cabin of the present invention.

Fig. 5 is a control logic diagram of the water cooling system control method of the present invention.

In the figure: in the figure: 1. The first outdoor exhaust valve; 2. The first lightning protection rod; 3. The first wind measuring equipment; 4. The first aviation light installation interface; 5. Micro weather station; 6 1. The second lightning protection rod; 7. The second aviation light installation interface; 8. The second wind measuring equipment; 9. The third wind measuring equipment; 10. The second external exhaust valve; 11. The third lightning protection Lightning rod; 12. Power line pipe; 13. Lightning line pipe; 14. Flexible hose; 15. Generator installation interface; 16. Gearbox installation interface; 17. Stop valve; 18. Pumping station water inlet; 19. Pump station outlet.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

An integrated air-water cooling system for a wind turbine cabin, as shown in Figure 1, includes an external radiator and pipelines, the external radiator includes external cooling plates, and the pipeline includes external pipelines and internal pipelines, The pipeline in the cabin is connected with a pump station, and the pump station is connected to the pipeline in the cabin through the pump station water inlet 18 and the water outlet 19 of the pump station on the pipeline in the cabin. The pipeline is connected with a generator and a gear box, the pumping station is connected with a heater, the pipeline in the cabin is connected with the pipeline outside the cabin, and the pipeline outside the cabin is connected with the radiator outside the cabin.

As shown in Figure 4, the pipeline in the cabin includes a generator installation interface 15 and a gearbox installation interface 16. The generator installation interface 15 is connected to the generator through the air-water cooler inside the generator, and the gearbox installation interface 16 is connected to the generator through the gearbox oil and water. The heat exchanger is connected to the gearbox. Both ends of the generator installation interface 15 and the two ends of the gearbox installation interface 16 are respectively provided with stop valves 17 .

As shown in Figure 2, there are several installation positions on the outer cooling plate, which are used to install the lightning protection rod, wind measuring equipment and miniature weather station 5, and the outer cooling plate is also provided with an aviation light installation interface. Specifically, three lightning protection lightning rods are provided on the top of the heat dissipation plate outside the cabin, including the first lightning protection lightning rod 2, the second lightning protection lightning rod 6 and the third lightning protection lightning rod 11. The top of the outer cooling plate is provided with three wind measuring devices, including the first wind measuring device 3, the second wind measuring device 8 and the third wind measuring device 9, and two The aviation light installation interface is used to install the aviation light, including the first aviation light installation interface 4 and the second aviation light installation interface 7, and a miniature weather station 5 is set beside the wind measuring equipment. As shown in FIG. 3 , a power line duct 12 and a lightning line duct 13 are arranged on the external pipeline, and the power line duct 12 and the lightning line duct are hard pipes 13 . The power line duct 12 and the lightning line duct 13 enter the electrical leads of electrical equipment such as anemometers, small weather station components, aviation warning lights, and lightning protection facilities into the cabin. Since the air-water-cooled external heat exchanger has the effect of obstructing and interfering with the wind flow, there is no suitable place for the wind measuring equipment to be placed on the top of the nacelle cover; the same is true for the lightning protection system, and the air-water-cooled external heat exchanger becomes the whole The highest position of the cabin, and lightning protection needs to be protected from top to bottom. In the present invention, the wind measuring equipment and the lightning protection rod are installed on the upper part of the external heat exchanger, at the position shown in Figure 2, to reduce the sheet metal structural parts of the unit, thereby eliminating the impact of the external radiator on the wind measuring system and the unit protection. The impact of the mine system.

The system also includes a number of exhaust valves in the cabin and a number of exhaust valves outside the cabin. The exhaust valves in the cabin are arranged on the pipeline inside the cabin, and the exhaust valves outside the cabin are arranged on the pipeline outside the cabin. The exhaust valve in the cabin is set at a relatively high position of the pipeline in the cabin, such as the outlet of the gearbox pipeline and the outlet of the generator pipeline, and the exhaust valve outside the cabin is set at a relatively high position outside the cabin. As shown in FIG. 2 , it includes the first outboard exhaust valve 1 and the second outboard exhaust valve 10 to prevent the formation of air pockets at high positions and affect the flow of coolant, heat exchange and water pump operation.

The sensor element of the valve body is a three-way valve sensor element, and the three-way valve sensor element controls the flow direction of the coolant according to the actual temperature of the coolant. The three-way valve sensor element can control whether to heat the cooling liquid and whether to make the cooling liquid pass through the cooling plate outside the cabin according to the actual temperature of the cooling liquid.

The pipeline in the cabin is fixed by the truss inside the cabin.

The pipes of the water cooling system are mainly connected by hard steel pipes, and a small amount of hoses are used to solve the problem of assembly tolerance, solve the problems of pipe fixing and assembly, and improve the aesthetics.

An integrated air-water cooling control method for a wind turbine nacelle, comprising: when the unit is connected to the grid, the pumping station of the water cooling system is started, and at this time, the interface of the sensor element of the three-way valve connected to the radiator outside the cabin is in a closed state, and the coolant does not stop. Flow through the outboard radiator; detect the temperature of the coolant at the outlet of the gearbox, and when the temperature of the coolant at the outlet of the gearbox is ≥ T ₀ ℃, activate the sensor element of the three-way valve so that the sensor element of the three-way valve is connected to the interface of the outboard radiator In the conduction state, the coolant flows through the outboard radiator for cooling; until the coolant temperature at the gearbox outlet is ≤T ₀ -10°C, close the three-way valve sensor element so that the three-way valve sensor element is connected to the outboard radiator. The interface is closed, and the coolant does not flow through the radiator outside the cabin; when the unit is off the grid for n minutes, the pump station of the water cooling system is turned off. Where T ₀ is the threshold temperature set manually according to the operating state of the wind turbine.

An integrated air-water cooling control method for a wind turbine nacelle, further comprising: when the unit is in a non-grid-connected state, when the temperature of the cooling liquid at the outlet of the gearbox is ≤ T _h ℃, the pumping station of the water cooling system is started, and the heater of the pumping station is started Carry out heating until the coolant temperature at the gearbox outlet is > T _h +5°C, the heater of the pump station is turned off, and the pump station of the water-cooling system is turned off. An integrated air-water cooling control method for a wind turbine nacelle of the present invention adopts the method of starting the pump station when the coolant temperature is low. A strategy to start the pump and heater below T _h . Among them, T _h is the anti-overcooling threshold temperature set by humans according to the operating state of the wind turbine.

An integrated air-water cooling control method for a wind turbine nacelle, further comprising: monitoring the temperature of the oil pool of the gearbox itself, when the temperature of the oil pool of the gearbox itself exceeds T _G , the value of the temperature T ₀ is reduced, and the value of the reduction of T ₀ is N(T _Y -T _G ), where _TY is the temperature of the oil pool of the gearbox itself, T _G is the preset comparison value, and N is the reduction coefficient. The value of N is set according to the actual situation of the wind turbine. If N is 1, when the temperature of the gearbox’s own oil pool exceeds T _G , the value of the temperature T ₀ drop is equal to the value when the temperature of the gearbox’s own oil pool exceeds T _G . When the temperature of the oil pool of the gearbox itself exceeds the specified value, the three-way solenoid valve of the water cooling system will reduce the switch control temperature according to the temperature difference of the gearbox oil pool temperature exceeding the specified value, so that the heat transfer temperature difference in the oil-water heat exchanger of the gearbox will be increased and enhanced. heat exchange. This working condition occurs when the power of the gearbox suddenly increases, and the water cooling system is controlled to dissipate heat in advance to prevent thermal shock.

An integrated air-water cooling control method for a wind turbine nacelle, further comprising: monitoring the pressure value of the coolant at the water inlet and/or water outlet of the generator and/or the gearbox in real time, when the water inlet and/or water outlet of the generator and/or the gearbox When the pressure value of the cooling liquid at the water inlet and/or the water outlet _{of the generator and/or gearbox is lower than P 2 ,} the system will give a warning prompt. The pump station is closed. The present invention adopts a secondary protection strategy for the return water pressure of the system. When it is lower than the set value P ₁ , it will only alarm, and when it is lower than the set value P ₂ , it will perform shutdown protection, so as to distinguish the response to different types of faults. Among them, P ₁ and P ₂ are the first threshold pressure and the second threshold pressure set manually according to the operating state of the wind turbine.

The problem existing in the existing technology is that the nacelle of the offshore wind turbine requires a strong airtightness, and with the increase of the power generation capacity, the heat dissipation of the generator and the gearbox becomes a technical difficulty. This invention is the first to propose a system that connects the water cooling pipelines of the generator and the gearbox in series, and proposes an efficient solution for the cooling of the nacelle in large-capacity offshore wind turbines.

In this embodiment, an integrated air-water cooling system for a wind turbine cabin includes a pump station, an outboard radiator, a pipeline and a valve body sensor element, and the pipeline includes an inboard pipeline and an outboard pipeline. The pumping station, the outboard radiator, the air-water cooler of the generator, and the oil-water heat exchanger of the gearbox are connected in series through the water-cooling pipeline, that is, the pipeline. The pump station is equipped with a heater, and there is a three-way valve at the water outlet 19 of the pump station. The three-way valve can control whether to heat the coolant and whether to let the coolant pass through the cooling plate outside the cabin according to the actual temperature conditions to prevent insufficient cooling and extreme temperatures. Conditions of overcooling. The radiator outside the cabin adopts the form of natural air cooling, providing the installation positions for the anemometer, small weather station components, aviation warning lights, and lightning protection facilities, and the electrical wires of the above equipment are connected into the cabin through hard pipes, and Meet the needs of wind measurement, lightning protection, prevention and control warning of the unit. The piping of the system is mainly in the form of hard steel pipes plus a small amount of hoses. Valve bodies are installed at the inlet and outlet of the generator and gearbox. The coolant exits the power unit of the pump station, first passes through the radiator outside the cabin, then passes through the air-water cooler inside the generator, and finally returns to the pump station through the oil-water heat exchanger of the gearbox. The coolant heated by the generator air-to-water cooler is passed into the gearbox oil-to-water heat exchanger for step-wise cooling, thereby improving the equipment utilization efficiency of the water-cooling system. The pipeline in the cabin adopts the connection form of a large number of hard pipes and a small amount of hoses, and a shut-off valve 17 is set at the inlet and outlet of the generator and gearbox to prevent the influence of maintenance of large parts on the water cooling system. Use the internal truss of the engine room to fix the water-cooling pipeline, and set the exhaust valve at a relatively high position, so as to reduce the influence of incomplete exhaust on the heat transfer of the gearbox.

In this embodiment, as shown in FIG. 1 , components such as a water-cooled pump station, a three-way valve, an outboard radiator, a generator, and a gearbox are combined through pipelines.

Specifically, the pump station pumps a certain flow of water, that is, coolant, to the three-way valve, and the three-way valve judges whether to perform internal circulation/outer circulation according to the temperature of the incoming water. The air forms heat exchange, thereby reducing its own temperature, and the cooled liquid enters the air-water cooler inside the generator to cool the air inside the generator. The liquid flows out from the outlet of the generator, and there is a certain temperature rise. The highest temperature here may reach 50°C in summer. Heater, reduce the temperature of the gearbox lubricating oil, and then reduce the temperature of the gearbox oil pool.

It should be noted that the described external radiator adopts the form of natural cooling, which reduces the problems of self-consumption and external power consumption. In addition, the external cooling plate simultaneously integrates weather sensors, aviation warning lights, and lightning protection. The combination of lightning devices solves the interference caused by the external cooling plate itself to the wind speed monitoring of the unit, the blocking of aviation lights, and the problems of lightning and lightning in the cabin. As shown in Figure 2, this structure can avoid functional conflicts and realize multiple functions in one body.

In actual use, with the structure shown in Figure 3, the power lines of the meteorological sensors and aviation warning lights are protected with a section of external pipeline, and connected to the cabin power control cabinet through the transition plate on the cabin cover; The lightning conductor is protected by another section of the external pipeline, which is connected to the grounding point of the engine room through the transition plate on the engine room cover, so as to avoid damage to the external heat exchanger and the engine room by the lightning current.

The serial connection of the generator and the gearbox brings about the complexity of the pipeline. In order to avoid the confusion of the pipeline in the cabin and the problem of poor manufacturability in the later stage, the present invention proposes a pipeline use strategy of mainly hard pipes and flexible hoses 14 , the detailed structure is shown in Figure 4. The hard pipe can maintain the shape to the greatest extent and is easy to fix to avoid the influence of engine room vibration on hydraulic performance. Multi-section hoses are used for the connections near generators, gearboxes, pump stations, and outboard radiators to solve the assembly tolerance problem of the water cooling system.

In order to solve the interference with other functional components of the unit, the pipeline in the cabin may form a bulge at the middle connection section, resulting in a "low-high-low" pipeline structure, and air pockets that are difficult to eliminate at local high positions. In this embodiment, a manual exhaust valve is used at a relatively high position at the outlet of the gearbox to discharge the high-level gas during the first water injection debugging, preventing the gas from entering the gearbox and the internal heat exchanger of the generator, affecting the heat exchange efficiency, and preventing the water pump from entering the heat exchanger. The main body produces cavitation, which improves its operating stability.

Given the different characteristics of generators and gearboxes, it is important to use a control method that combines the needs of both. The present invention proposes the following water-cooling system control logic, as shown in FIG. 5 . In this embodiment, a wind turbine nacelle integrated air-water cooling control method includes:

1) When the unit is connected to the grid, start the water-cooled pump station. When the unit is disconnected from the grid for n minutes, the water-cooled pump station will be shut down for a delay to dissipate the waste heat.

2) When the unit is connected to the grid, the pumping station of the water cooling system starts, and the coolant does not pass through the radiator outside the cabin at first. When the temperature of the coolant at the outlet of the gearbox reaches T ₀ , the three-way solenoid valve is activated to allow the coolant to pass through the outside of the cabin. For cooling, when the coolant temperature is lower than T ₀ -10°C, close the three-way solenoid valve.

3) When the unit is not connected to the grid and the outlet temperature of the gearbox is lower than T _h ℃, start the pumping station of the water cooling system and start the heater of the pumping station to make the temperature of the cooling liquid of the unit reach above T _h +5 ℃.

4) Simultaneously monitor the temperature and pressure values of the generator and gearbox inlet and outlet, as well as the system flow value, and implement _a secondary protection strategy for the system return water pressure value. When the value P _{is 2} , it is used for shutdown protection, so as to distinguish the response to different types of faults.

When the temperature of the oil pool of the gearbox itself exceeds the specified value, the three-way solenoid valve of the water cooling system will reduce the switch control temperature according to the temperature difference of the gearbox oil pool temperature exceeding the specified value, so that the heat transfer temperature difference in the oil-water heat exchanger of the gearbox will be increased and enhanced. heat exchange. This working condition occurs when the power of the gearbox suddenly increases, and the water cooling system is controlled to dissipate heat in advance to prevent thermal shock.

According to the grid-connected requirements of the generator, the present invention formulates a strategy of starting the water-cooling system when the unit is connected to the grid. At the same time, in order to prevent the gearbox oil from being "overcooled" by the low temperature in the standby state in winter, it is proposed that when the coolant temperature is lower than T _h At this time, the water pump is started, that is, the pump station and the heater. Aiming at the problem of waste heat dissipation of generators and gearboxes after off-grid, the principle of shutting down the water-cooling system for n minutes after off-grid has been formulated. The n value is adjusted according to the actual grid-connected time to prevent electricity waste.

In order to prevent the gear box lubricating oil from being over-cooled by the water-cooling system, the present invention proposes to use a three-way valve to switch between internal and external circulation. The heat is dissipated through the external radiator to reduce the interference of the external environment on the cooling system. When the outlet temperature of the gearbox is higher than T ₀ , the three-way valve is switched to the external circulation. At this time, the temperature of the coolant is higher, so that the temperature difference in the oil-water heat exchanger of the gearbox is smaller to prevent the oil of the gearbox from overcooling; when the outlet of the gearbox When the temperature is lower than T ₀ -10°C, the three-way valve switches to internal circulation to heat the internal coolant of the system and reduce the temperature difference of the oil-water heat exchanger of the gearbox.

In addition, the invention proposes a two-stage pressure protection strategy for the low-pressure problem of liquid leakage in the system. When the return water pressure is lower than P ₁ , the unit only alarms and requires maintenance personnel to replenish coolant, fully considering the accessibility of offshore maintenance. When the return water pressure is lower than the lower pressure _P2 , the unit will give an alarm and shut down, indicating that the unit has a serious liquid leakage fault and needs to be dealt with in time, so as to protect other systems in the cabin from damage.

In addition, the system is also equipped with flow monitoring to verify the working status of field devices in real time and benchmark design values.

The above is only a specific implementation of the present invention, but the scope of protection of the present invention is not limited thereto, and any changes or replacements that are not conceived through creative work shall be covered within the scope of protection of the present invention.

Claims (10)

1. The integrated air-water cooling system for the engine room of the wind turbine generator is characterized by comprising an extra-cabin radiator and a pipeline, wherein the extra-cabin radiator comprises an extra-cabin radiating plate, the pipeline comprises an extra-cabin pipeline and an extra-cabin pipeline, the extra-cabin pipeline is connected with a pump station, a water outlet of the pump station is provided with a valve body sensor element, the extra-cabin pipeline is connected with a generator and a gear box, the pump station is connected with a heater, the extra-cabin pipeline is connected with the extra-cabin pipeline, and the extra-cabin pipeline is connected with the extra-cabin radiator.

2. The integrated air-water cooling system for the wind turbine generator cabin according to claim 1, wherein the cabin pipeline comprises a generator mounting interface and a gearbox mounting interface, the generator mounting interface is connected with a generator through an internal generator air-water cooler, the gearbox mounting interface is connected with a gearbox through a gearbox oil-water heat exchanger, and the cabin pipeline is fixed through an internal cabin truss.

3. The integrated air-water cooling system of the wind turbine generator room as claimed in claim 2, wherein two ends of the generator mounting interface and two ends of the gear box mounting interface are respectively provided with a stop valve.

4. The integrated air-water cooling system for the wind turbine generator cabin according to claim 1, wherein a power line pipeline and a lightning wire receiving pipeline are arranged on the extra-cabin pipeline, and the power line pipeline and the lightning wire receiving pipeline are hard pipelines.

5. The integrated air-water cooling system for the engine room of the wind turbine generator set as claimed in claim 3 or 4, wherein a plurality of installation positions are arranged on the radiating plate sheet outside the engine room, the installation positions are used for installing a lightning protection lightning rod, a wind measuring device and a micro weather station, and an aviation lamp installation interface is further arranged on the radiating plate sheet outside the engine room.

6. The integrated air-water cooling system for the wind turbine generator system cabin according to claim 1, further comprising a plurality of cabin interior exhaust valves and a plurality of cabin exterior exhaust valves, wherein the cabin interior exhaust valves are arranged on the cabin interior pipeline, the cabin exterior exhaust valves are arranged on the cabin exterior pipeline, the valve body sensor element is a three-way valve sensor element, and the three-way valve sensor element controls the flow direction of the cooling liquid according to the actual temperature of the cooling liquid.

7. An integrated air-water cooling control method for a wind turbine generator room is applicable to the integrated air-water cooling system for the wind turbine generator room as claimed in any one of claims 1 to 6, and is characterized by comprising the following steps:

when the unit is in a grid-connected state, a pump station of the water cooling system is started, at the moment, an interface of a three-way valve sensor element communicated with the outboard radiator is in a closed state, and cooling liquid does not flow through the outboard radiator; detecting the temperature of the cooling liquid at the outlet of the gear box, and when the temperature of the cooling liquid at the outlet of the gear box is more than or equal to T ₀ When the temperature is higher than the preset temperature, starting a three-way valve sensor element to enable an interface of the three-way valve sensor element, which is communicated with the outboard radiator, to be in a conducting state, and cooling liquid flows through the outboard radiator to be cooled; until the temperature of the cooling liquid at the outlet of the gear box is less than or equal to T ₀ Closing the three-way valve sensor element when the temperature is minus 10 ℃, so that an interface of the three-way valve sensor element, which is communicated with the outboard radiator, is in a closed state, and the cooling liquid does not flow through the outboard radiator; and when the unit is off-line for n minutes, closing a pump station of the water cooling system.

8. The wind turbine generator room integrated air-water cooling control method according to claim 7, further comprising:

when the temperature of the cooling liquid at the outlet of the gear box is less than or equal to T when the unit is in a non-grid-connected state _h When the temperature is higher than the preset temperature, a pump station of the water cooling system is started, and a pump station heater is started to heat until the temperature of cooling liquid at the outlet of the gear box is higher than T _h At +5 deg.C, the pump station heater is turned off, and water cooling is carried outThe pumping station of the system is closed.

9. The integrated air-water cooling control method for the wind turbine generator room as claimed in claim 7, further comprising: monitoring the temperature of the oil pool of the gear box, and when the temperature of the oil pool of the gear box exceeds T _G Time, temperature T ₀ Decrease in value of, T ₀ The reduced value is N (T) _Y -T _G ) Wherein T is _Y Is the temperature of the oil sump of the gearbox itself, T _G N is a predetermined comparison value, and is a decreasing coefficient.

10. The integrated air-water cooling control method for the wind turbine generator room as claimed in claim 7, 8 or 9, further comprising:

monitoring the pressure value of the cooling liquid at the water inlet and/or the water outlet of the generator and/or the gear box in real time, and when the pressure value of the cooling liquid at the water inlet and/or the water outlet of the generator and/or the gear box is lower than P ₁ When the pressure value of the cooling liquid at the water inlet and/or the water outlet of the generator and/or the gear box is lower than P, the system gives a warning prompt ₂ And when the water cooling system pump station is closed.

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