A wind turbine lubrication cooling system and a control method thereof
By designing a lubrication and cooling system, oil is used to cool and lubricate the wind turbine generator set in a closed space, which solves the defects of air cooling and water cooling, achieves efficient and low-cost heat dissipation, and protects the key components of the generator set.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- XEMC WINDPOWER CO LTD
- Filing Date
- 2024-01-15
- Publication Date
- 2026-07-21
AI Technical Summary
Existing methods for cooling wind turbine generators suffer from problems such as large space requirements or high costs. Furthermore, both air cooling and water cooling have their own drawbacks, making it difficult to effectively address the heat dissipation needs under high power density conditions.
The system employs a lubrication and cooling system, which uses oil to cool and lubricate the generator and gearbox within a closed space. By utilizing the design of the main oil circuit, branch oil circuits, and return oil circuit, combined with components such as filters, temperature control valves, and dielectric constant detection sensors, the system achieves effective management and control of the oil.
It achieves efficient heat dissipation without taking up extra space, reduces costs, and protects the generator by dielectric constant detection to prevent wear and extend the service life of the equipment.
Smart Images
Figure CN117685184B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of wind power generation equipment, and in particular to a lubrication and cooling system for a wind turbine generator set and its control method. Background Technology
[0002] As wind turbine generators gradually develop towards higher power density, the heat dissipation and cooling of the generator and gearbox in wind power generation equipment has become increasingly important. Therefore, how to effectively solve the heat dissipation and cooling problem of wind turbine generators is one of the important issues that need to be addressed in the development of wind turbine generators towards higher power.
[0003] Currently, wind turbine generators are typically cooled by air cooling and liquid cooling. Air cooling usually uses airflow to remove the heat generated by the components of the wind turbine generator during operation. Liquid cooling, on the other hand, usually uses water cooling to cool the wind turbine generator. When using water cooling to cool the wind turbine generator, different flow channel structures and different fin sizes are usually set to increase the heat dissipation of the generator.
[0004] However, air cooling takes up a lot of space, which restricts the layout of the wind turbine nacelle. Water cooling requires an additional water cooling system, which is costly and poses risks of leakage and uneven heat dissipation. Summary of the Invention
[0005] In order to avoid the above-mentioned problems while ensuring the heat dissipation efficiency of wind turbine generator sets, in the first aspect, this application provides a wind turbine generator set lubrication and cooling system.
[0006] The wind turbine generator lubrication and cooling system provided in this application adopts the following technical solution:
[0007] It includes an oil tank, oil pump 1, main oil circuit, gearbox, generator, and radiator. One end of the main oil circuit is connected to the oil tank, and the other end of the main oil circuit is provided with branch oil circuit 1 and branch oil circuit 2. The end of branch oil circuit 1 away from the main oil circuit is connected to the generator, and the end of branch oil circuit 2 away from the main oil circuit is connected to the gearbox. Oil pump 1 and radiator are arranged sequentially on the main oil circuit along the flow direction of the oil in the main oil circuit. The generator is provided with return oil circuit 1, and the gearbox is provided with return oil circuit 2. Both return oil circuit 1 and return oil circuit 2 are connected to the oil tank.
[0008] By adopting the above technical solution, when cooling of the gearbox and generator is required, oil pump one is started, allowing oil in the tank to be drawn into the main oil circuit. Within the main oil circuit, oil flows towards branch oil circuit one and branch oil circuit two. After passing through the radiator in the main oil circuit, a portion of the cooled oil is transported to the generator via branch oil circuit one, while the remaining oil enters the gearbox via branch oil circuit two, thus cooling both the generator and gearbox. Simultaneously, the oil also lubricates the gearbox. Afterwards, the oil in the generator flows back to the oil tank via return oil circuit one on the generator, while the oil in the gearbox flows back via return oil circuit two. The oil flows into the oil tank. During the cooling process of the generator and gearbox, since the cooling system cools the generator and gearbox through oil, and the oil lubricates the gearbox as it flows through it, the entire cooling process does not require an open space like air cooling. Instead, it can cool the generator and gearbox in a closed space, so it is less likely for dust to accumulate in the generator and gearbox. In addition, since the oil flows directly into the generator and gearbox to cool them, there is no need to install flow channels and fins on each component for water cooling, resulting in lower costs. It achieves better heat dissipation while overcoming the heat dissipation defects of both air cooling and water cooling.
[0009] Optionally, a filter is installed on the main oil line, located between the radiator and the oil pump.
[0010] By adopting the above technical solution, filter one is installed on the main oil line, and filter one is located between the radiator and oil pump one, so that the oil is filtered before flowing into the radiator, generator and gearbox, thereby reducing impurities in the oil and protecting the radiator, generator and gearbox.
[0011] Optionally, a branch oil line three is provided on the main oil line at the position between oil pump one and filter one. The end of the branch oil line three away from the main oil line is located in the oil tank, and a safety valve one is provided on the branch oil line three.
[0012] By adopting the above technical solution, when the oil in the main oil circuit accumulates in front of filter one, causing excessive pressure at the oil inlet of filter one, safety valve one opens, allowing the oil to flow back from branch oil circuit three to the oil tank, thereby reducing the probability of excessive oil pressure at the oil inlet of filter one and protecting filter one.
[0013] Optionally, a throttle valve and a solenoid valve are sequentially installed along the flow direction of the oil in the branch oil circuit.
[0014] By adopting the above technical solution, the flow rate of oil entering the generator and gearbox can be controlled by the throttle valve. At the same time, when the generator is not running, the oil can be prevented from flowing through the generator by activating the solenoid valve, so that wear particles in the oil will not easily damage the generator when it is not running.
[0015] Optionally, a bypass oil circuit is connected in parallel to the main oil circuit. One end of the bypass oil circuit is connected to the main oil circuit at the position between the radiator oil inlet and the first filter, and the other end of the bypass oil circuit is connected to the main oil circuit at the position between the radiator oil outlet. A temperature control valve is installed on the bypass oil circuit to control the opening and closing of the bypass oil circuit.
[0016] By adopting the above technical solution, when the oil flows to the temperature control valve, the temperature sensing element built into the temperature control valve senses the oil temperature. When the oil temperature is lower than a certain preset value, the temperature control valve opens, allowing the oil to flow directly into the generator and gearbox through the bypass oil circuit without passing through the radiator. This reduces the probability of damage to the radiator due to excessive pressure drop and overflow in the main oil circuit. When the oil temperature is higher than a certain preset value, the temperature control valve closes, requiring the oil to pass through the radiator for heat dissipation before entering the generator and gearbox, thereby improving the cooling effect of the oil on the generator and gearbox.
[0017] Optionally, a temperature sensor 1 is installed on the oil tank, and a temperature sensor 2, a temperature sensor 3, a pressure sensor 1, and a pressure sensor 2 are installed on the main oil line. Temperature sensor 2 and pressure sensor 1 are connected in series on the main oil line at the position between the radiator and the bypass oil line, and temperature sensor 3 and pressure sensor 2 are connected in series on the main oil line at the position between the radiator oil outlet and branch oil line 1.
[0018] By adopting the above technical solution, temperature sensor 1 on the oil tank is used to detect the oil temperature in the oil tank, while temperature sensor 2 and temperature sensor 3 on the main oil circuit are respectively set at the oil inlet and oil outlet of the radiator, thereby detecting the temperature of the oil before it enters the radiator and the temperature of the oil flowing out of the radiator. By comparing the temperatures between temperature sensor 2 and temperature sensor 3, it is possible to determine whether the radiator is working properly. Pressure sensor 1 and pressure sensor 2 are used to determine the oil pressure at the oil inlet and the oil outlet of the radiator, respectively, thereby determining whether there is an oil leak in the main oil circuit.
[0019] Optionally, the oil tank is also equipped with a circulating oil circuit, on which oil pump two and filter two are installed in sequence. At the location of temperature sensor three and pressure sensor two on the main oil circuit, a dielectric constant detection sensor is also connected in parallel.
[0020] By adopting the above technical solution, the dielectric constant detection sensor is used to detect the dielectric constant of the oil entering the generator and the gearbox. When the oil pump 1 is in operation, if the dielectric constant detection sensor detects that the dielectric constant of the oil entering the oil is less than the preset warning value K1, the oil pump 2 is started, and then the oil in the fuel tank is introduced into the circulating oil path, so that the oil in the fuel tank is continuously filtered by the filter 2, reducing the impurities in the oil in the fuel tank, and increasing the dielectric constant of the oil in the fuel tank until the dielectric constant sensor senses that the dielectric constant of the oil in the main oil path is higher than the preset normal threshold K2. At this time, the oil pump 2 is turned off, and the oil stops circulating in the filter 2. As the oil in the main oil path continuously circulates, during the circulation process, the dielectric constant of the oil will decrease due to the continuous operation of the gearbox. When the dielectric constant of the oil in the main oil path is lower than the warning value K1 again, the oil pump 2 is restarted again to increase the dielectric constant of the oil. If the dielectric constant is still in a decreasing state as the gearbox operates, when the dielectric constant is less than the limit value K3 (K3 < K1), the solenoid valve is disconnected so that the oil in the main oil path does not flow into the generator, thereby avoiding damage to the generator caused by metal wear particles in the oil, and the generator stops operating. At this time, the oil pump 1 and the oil pump 2 are still in operation, so that the oil is continuously filtered by the filter 1 and the filter 2 to increase the dielectric constant of the oil until the dielectric constant of the oil is not lower than the threshold K2, then the solenoid valve is reconnected, and the generator also starts to work.
[0021] Optionally, a branch oil path 4 is provided on the circulating oil path. One end of the branch oil path 4 is connected to the circulating oil path, and the other end of the branch oil path 4 is connected to the fuel tank. A safety valve 2 is provided on the branch oil path 4.
[0022] By adopting the above technical solution, when the oil in the circulating oil path accumulates in front of the filter 2, causing excessive pressure at the inlet of the filter 2, the safety valve 2 is opened, enabling the oil to flow back to the fuel tank through the branch oil path 4, thereby reducing the probability of excessive oil pressure at the inlet of the filter 2 and playing a role in protecting the filter 2.
[0023] In a second aspect, the present application also provides a control method for a lubrication and cooling system of a wind turbine generator, which is used to control the above-mentioned lubrication and cooling system of a wind turbine generator, and includes the following steps:
[0024] S100: Start the oil pump 1 to make the oil flow in the main oil path. At the same time, the dielectric constant detection sensor detects the dielectric constant of the oil in the main oil path and compares the detected value with the preset warning value K1, threshold K2, and limit value K3.
[0025] S200: Compare the dielectric constant of the oil with the warning value K1.
[0026] If the dielectric constant of the oil is greater than the warning value K1, then oil pump one will start normally and oil pump two will be in standby mode.
[0027] If the dielectric constant of the oil is less than the warning value K1, then the dielectric constant of the oil is compared with the limit value K3.
[0028] S300: If the dielectric constant of the oil is greater than the limit K3, then start oil pump two, while oil pump one continues to run.
[0029] If the dielectric constant in the oil is less than the limit K3, then oil pump two will start. At this time, oil pump one will continue to run, the solenoid valve will disconnect branch oil circuit one, and the generator will stop running.
[0030] S400: When oil pump two is started, the dielectric constant of the oil is compared with the threshold K2 again;
[0031] If the dielectric constant of the oil is less than K2, then the dielectric constant of the oil is compared with the limit K3 again, and step S300 is repeated until the dielectric constant of the oil is greater than K2.
[0032] If the dielectric constant of the oil is greater than K2, then the second oil pump will stop running, and the solenoid valve will change from open to closed, allowing the oil in the main oil circuit to flow back into the generator, and the generator will operate normally.
[0033] In summary, this application includes at least the following beneficial technical effects:
[0034] 1. By setting up components such as oil tank, oil pump, and main oil circuit, the oil in the oil tank can flow into the gearbox and generator. The oil lubricates and cools the gearbox in the wind turbine generator set, while also dissipating heat from the generator. This achieves a better heat dissipation effect while overcoming the heat dissipation defects of both air cooling and water cooling.
[0035] 2. By detecting the dielectric constant of the oil, the start-up and shutdown of the generator and oil pump 2 are controlled, so that metal wear particles in the oil will not easily damage the generator, thus protecting the generator and enabling it to be used for a long time. Attached Figure Description
[0036] Figure 1 This is a schematic diagram of a wind turbine generator lubrication and cooling system according to Embodiment 1 of this application.
[0037] Figure 2 This is a flowchart illustrating a control method for a wind turbine generator lubrication and cooling system according to Embodiment 2 of this application.
[0038] Explanation of reference numerals in the attached diagram: 1. Oil tank; 2. Oil pump one; 3. Main oil circuit; 4. Gearbox; 5. Generator; 6. Radiator; 7. Branch oil circuit one; 8. Branch oil circuit two; 9. Return oil circuit one; 10. Return oil circuit two; 11. Filter one; 12. Branch oil circuit three; 13. Safety valve one; 14. Throttle valve; 15. Solenoid valve; 16. Bypass oil circuit; 17. Temperature control valve; 18. Temperature sensor one; 19. Temperature sensor two; 20. Temperature sensor three; 21. Pressure sensor one; 22. Pressure sensor two; 23. Circulation oil circuit; 24. Oil pump two; 25. Filter two; 26. Dielectric constant detection sensor; 27. Branch oil circuit four; 28. Safety valve two. Detailed Implementation
[0039] The following is in conjunction with the appendix Figure 1-2 This application will be described in further detail.
[0040] Example 1
[0041] Embodiment 1 of this application discloses a lubrication and cooling system for a wind turbine generator set, referring to... Figure 1 The system includes an oil tank 1, an oil pump 2, a main oil circuit 3, a gearbox 4, a generator 5, and a radiator 6. One end of the main oil circuit 3 is connected to the oil tank 1. At the end of the main oil circuit 3 furthest from the oil tank 1, there are two branch oil circuits 7 and 8, which are connected to the main oil circuit 3. The end of branch oil circuit 7 furthest from the main oil circuit 3 is connected to the generator 5, and the end of branch oil circuit 8 furthest from the main oil circuit 3 is connected to the gearbox 4. The oil pump 2 and the radiator 6 are arranged sequentially between the oil tank 1 and branch oil circuit 7 along the direction of oil flow in the main oil circuit 3. This allows the oil to enter the main oil circuit 3 from the oil tank 1 when the oil pump 2 starts. As the oil flows through the main oil circuit 3, it passes through the radiator 6 and is cooled down. This allows the oil to cool the generator 5 and gearbox 4 when it flows through the branch oil circuit 7 and the branch oil circuit 8. Since the oil itself has a lubricating effect, it can also lubricate the gearbox 4 while cooling it, thus ensuring the normal operation of the gearbox 4.
[0042] The generator 5 is equipped with a return oil passage 19, and the gearbox 4 is equipped with a return oil passage 20. Both return oil passage 19 and return oil passage 20 are connected to the oil tank 1, which allows the oil entering the generator 5 and the gearbox 4 to flow back to the oil tank 1 through return oil passage 19 and return oil passage 20 respectively.
[0043] Furthermore, a filter 11 is installed on the main oil circuit 3 between the radiator 6 and the oil pump 2. This allows the oil to pass through the filter 11 before flowing into the radiator 6, thereby reducing impurities in the oil and lowering the probability of the radiator 6 being clogged by oil impurities.
[0044] In order to prevent the pressure at the filter inlet from being too high, a branch oil circuit 3 12 is also provided in the main oil circuit 3 between the filter and the oil pump 2. A safety valve 13 is installed on the branch oil circuit 3 12. When the pressure at the filter inlet is too high, the oil at the filter inlet can be returned to the oil tank 1 through the branch oil circuit 3 12 by opening the safety valve 13, thereby reducing the pressure at the filter inlet.
[0045] To regulate the flow rate of oil entering the generator 5 and gearbox 4, a throttle valve 14 and a solenoid valve 15 are sequentially installed along the oil flow direction on the branch oil circuit 7. The throttle valve 14 regulates the flow rate of oil entering the generator 5 from the main oil circuit 3. That is, when the throttle valve 14 reduces the flow rate of oil entering the generator 5, the flow rate of oil flowing into the gearbox 4 increases while the flow rate of oil in the main oil circuit 3 remains constant. Conversely, when the throttle valve 14 increases the flow rate of oil entering the generator 5, the flow rate of oil flowing into the gearbox 4 decreases while the flow rate of oil in the main oil circuit 3 remains constant. If it is necessary to disconnect the path of oil flowing into the generator 5, the position of the main oil circuit 3 between the branch oil circuit 7 and the generator 5 can be disconnected by activating the solenoid valve 15, so that all the oil in the main oil circuit 3 can flow into the gearbox 4.
[0046] A bypass oil line 16 is connected in parallel to the main oil line 3. One end of the bypass oil line 16 is connected to the main oil line 3 between the oil inlet of the radiator 6 and the filter 11, while the other end of the bypass oil line 16 is connected to the main oil line 3 between the oil outlet of the radiator 6 and the branch oil line 7. A thermostatic valve 17 is also installed on the bypass oil line 16. When the oil temperature is low, the thermostatic valve 17 detects the oil temperature through its built-in temperature sensing element and opens, allowing the oil to flow directly through the bypass oil line 16 to the generator 5 and gearbox 4 without passing through the radiator 6 for cooling. This reduces the probability of the radiator 6 being damaged due to excessive pressure drop and the main oil line 3 overflowing. When the thermostatic valve 17 senses that the oil temperature is higher than a certain preset value, the thermostatic valve 17 closes, ensuring that the oil in the main oil line 3 can only flow into the generator 5 and gearbox 4 after being cooled by the radiator 6.
[0047] Furthermore, a temperature sensor 18 for sensing the temperature of the oil inside the oil tank 1 is installed on the oil tank 1. Temperature sensors 19, 20, 21, and 22 are also installed on the main oil circuit 3. Temperature sensor 19 and pressure sensor 21 are connected in series on the main oil circuit 3 between the oil inlet of the radiator 6 and the bypass oil circuit 16. Temperature sensor 20 and pressure sensor 22 are connected in series on the main oil circuit 3 between the oil outlet of the radiator 6 and the branch oil circuit 7. The positions between these sensors allow temperature sensors 19 and 20 on the main oil circuit 3 to detect the temperature of the oil before it enters the radiator 6 and the temperature of the oil flowing out of the radiator 6, respectively. By comparing the temperatures of temperature sensors 19 and 20, it is possible to determine whether the radiator 6 is working properly. Pressure sensors 21 and 2 are used to detect the oil pressure at the oil inlet and the oil outlet of the radiator 6, respectively, thereby determining whether there is an oil leak in the main oil circuit 3.
[0048] A circulation oil circuit 23 is also provided on the fuel tank 1. Both the oil inlet end and the oil outlet end of the circulation oil circuit 23 are connected to the fuel tank 1. Along the direction from the oil inlet end to the oil outlet end of the circulation oil circuit 23, an oil pump two 24 and a filter two 25 are successively arranged. At the positions where a temperature sensor three 20 and a pressure sensor two 22 are arranged on the main oil circuit 3, a dielectric constant detection sensor 26 is connected in parallel. The dielectric constant detection sensor 26 is used to detect the dielectric constant of the oil entering the generator 5 and the gearbox 4. When the oil pump one 2 is in operation and the dielectric constant detection sensor 26 senses that the dielectric constant of the oil entering is less than a preset warning value K1, the oil pump two 24 is started, and then the oil in the fuel tank 1 is introduced into the circulation oil circuit 23, so that the oil in the fuel tank 1 continuously passes through the filter two 25 for filtration, reducing the impurities in the oil in the fuel tank 1 and increasing the dielectric constant of the oil in the fuel tank 1 until the dielectric constant detection sensor senses that the dielectric constant of the oil in the main oil circuit 3 is higher than a preset normal threshold K2 (K2≥K1). At this time, the oil pump two 24 is turned off, and the oil stops circulating in the filter two 25. As the oil in the main oil circuit 3 continuously circulates, during the circulation process, due to the continuous operation of the gearbox 4, the dielectric constant of the oil will decrease. When the dielectric constant of the oil in the main oil circuit 3 is lower than the warning value K1 again, the oil pump two 24 is restarted again to increase the dielectric constant of the oil. If the dielectric constant is still in a decreasing state as the gearbox 4 operates, when the dielectric constant is less than a limit value K3 (K3<K1), the solenoid valve 15 is disconnected, so that the oil in the main oil circuit 3 does not flow into the generator 5 through the branch oil circuit one 7, thus avoiding damage to the generator 5 caused by metal wear particles in the oil, and the generator 5 stops operating. At this time, the oil pump one 2 and the oil pump two 24 are still in operation, so that the oil is continuously filtered by the filter one 11 and the filter two 25 to increase the dielectric constant of the oil until the dielectric constant of the oil is not lower than the threshold K2, then the solenoid valve 15 is reconnected, and the generator 5 also starts to work.
[0049] Further, a branch oil circuit four 27 is provided on the circulation oil circuit 23. One end of the branch oil circuit four 27 is connected to the position of the circulation oil circuit 23 between the oil pump two 24 and the filter two 25, and the other end of the branch oil circuit four 27 is connected to the fuel tank 1. A safety valve two 28 is also provided on the branch oil circuit four 27, which enables when the pressure at the oil inlet of the filter two 25 is relatively large, the oil in the circulation oil circuit 23 can flow back to the fuel tank 1 through the branch oil circuit four 27 by opening the safety valve two 28, thereby reducing the pressure at the oil inlet of the filter two 25.
[0050] Furthermore, a switch valve one and a switch valve two are respectively provided at one end of the main oil circuit 3 close to the fuel tank 1 and at a position close to the limit at the oil inlet end of the circulation oil circuit 23. The switch valve one and the switch valve two are respectively used to control the opening and closing of the main oil circuit 3 and the circulation oil circuit 23.
[0051] The implementation principle of this application embodiment is as follows: Switch valve one and switch valve two are opened, and oil pump one 2 is started. This allows the oil in oil tank 11 to flow into the main oil circuit 3 under the pump's suction, moving towards the generator 5 and gearbox 4. When the oil flows to the bypass oil circuit 16, the temperature control valve 17 senses and detects the oil temperature. When the oil temperature does not exceed a preset temperature value (45 degrees Celsius in this embodiment), the temperature control valve 17 is fully open. At this time, the oil can directly enter the bypass oil circuit 16 through the temperature control valve 17 and flow directly into the gearbox 4 and generator 5, thereby cooling and lubricating the gearbox 4 and the generator 5. The oil is cooled and dissipated. When the oil temperature exceeds another preset temperature value (in this embodiment, the other preset temperature value is 60 degrees Celsius), the temperature control valve 17 is closed. The oil can only enter the generator 5 and gearbox 4 after being cooled by the radiator 6, so as to cool and lubricate the gearbox 4 and cool and dissipate the generator 5. When the temperature is between the two preset temperature values, the temperature control valve 17 is in a semi-open state. The higher the oil temperature, the greater the opening degree of the temperature control valve 17, so that the oil is diverted at the bypass oil passage 16, so that part of the oil is cooled by the radiator 6, while the other part of the oil is cooled naturally by flowing in the bypass oil passage 16.
[0052] During the oil circulation process in the main oil circuit 3, the dielectric constant detection sensor 26 detects the dielectric constant of the oil. When the dielectric constant of the oil is greater than the warning value K1, oil pump 24 is started, so that the oil in the oil tank 1 can be circulated and filtered in the circulating oil circuit 23 under the action of oil pump 24, thereby increasing the dielectric constant of the oil until the dielectric constant value of the oil is not lower than the threshold K2 (K2≥K1). Then, oil pump 24 is stopped. As the oil continues to circulate and the gearbox 4 wears, when the dielectric constant of the oil drops to between K3 and K1, oil pump 24 is restarted to increase the dielectric constant of the oil. If the dielectric constant still drops at this time, when the dielectric constant is less than K3, the solenoid valve 15 is closed and the generator 5 stops running. Oil pump 2 and oil pump 24 continue to run until the dielectric constant is not less than K2. Then the solenoid valve 15 is connected, so that the oil can flow into the generator 5, and the generator 5 starts normally.
[0053] Example 2
[0054] Reference Figure 2 Embodiment 2 of this application provides a control method for a lubrication and cooling system of 56 wind turbine generators, used to control the lubrication and cooling system of 56 wind turbine generators in Embodiment 1 above, including the following steps:
[0055] S100: Start oil pump 2 to make oil flow in the main oil circuit 3. At the same time, dielectric constant detection sensor 26 detects the dielectric constant of the oil in the main oil circuit 3 and compares the detected value with the preset warning value K1, threshold K2 and limit value K3.
[0056] S200: Compare the dielectric constant of the oil with the warning value K1;
[0057] If the dielectric constant in the oil is greater than the warning value K1, then oil pump 2 will start normally and oil pump 24 will be in standby mode.
[0058] If the dielectric constant of the oil is less than the warning value K1, then the dielectric constant of the oil is compared with the limit value K3.
[0059] S300: If the dielectric constant of the oil is greater than the limit K3, then start oil pump 24. At this time, oil pump 2 will continue to run.
[0060] If the dielectric constant in the oil is less than the limit K3, then oil pump 24 will start. At this time, oil pump 2 will continue to run, solenoid valve 15 will disconnect branch oil circuit 7, and generator 5 will stop running.
[0061] S400: After oil pump 24 is started, the dielectric constant of the oil is compared with the threshold K2.
[0062] If the dielectric constant of the oil is less than K2, then the dielectric constant of the oil is compared with the limit K3 again, and step S300 is repeated until the dielectric constant of the oil is greater than K2.
[0063] If the dielectric constant of the oil is greater than K2, then the oil pump 24 stops running, and the solenoid valve 15 changes from open to closed, so that the oil in the main oil circuit 3 flows back into the generator 5, and the generator 5 operates normally.
[0064] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A lubrication and cooling system for a wind turbine generator set, characterized in that: The system includes an oil tank (1), an oil pump (2), a main oil circuit (3), a gearbox (4), a generator (5), and a radiator (6). One end of the main oil circuit (3) is connected to the oil tank (1), and the other end of the main oil circuit (3) is provided with a branch oil circuit (7) and a branch oil circuit (8). The end of the branch oil circuit (7) away from the main oil circuit (3) is connected to the generator (5), and the end of the branch oil circuit (8) away from the main oil circuit (3) is connected to the gearbox (4). The oil pump (2) and the radiator (6) are arranged sequentially on the main oil circuit (3) along the flow direction of the oil in the main oil circuit (3). The generator (5) is provided with a return oil circuit (9), and the gearbox (4) is provided with a return oil circuit (2) (10). Both the return oil circuit (9) and the return oil circuit (2) (10) are connected to the oil tank (1). A filter (11) is provided on the main oil circuit (3), and the filter (11) is located between the radiator (6) and the oil pump (2); A bypass oil passage (16) is connected in parallel to the main oil passage (3). One end of the bypass oil passage (16) is connected to the main oil passage (3) at the position between the oil inlet of the radiator (6) and the filter (11). The other end of the bypass oil passage (16) is connected to the main oil passage (3) at the position between the oil outlet of the radiator (6). A temperature control valve (17) for controlling the opening and closing of the bypass oil passage (16) is provided on the bypass oil passage (16). Temperature sensor 1 (18) is installed on the oil tank (1). Temperature sensor 2 (19), temperature sensor 3 (20), pressure sensor 1 (21) and pressure sensor 2 (22) are installed on the main oil circuit (3). Temperature sensor 2 (19) and pressure sensor 1 (21) are connected in series on the main oil circuit (3) at the position between the radiator (6) and the bypass oil circuit (16). Temperature sensor 3 (20) and pressure sensor 2 (22) are connected in series on the main oil circuit (3) at the position between the radiator (6) and the branch oil circuit 1 (7). The oil tank (1) is also provided with a circulating oil circuit (23), and the circulating oil circuit (23) is provided with an oil pump (24) and a filter (25) in sequence. The main oil circuit (3) is provided with a dielectric constant detection sensor (26) connected in parallel at the position where the temperature sensor (20) and the pressure sensor (22) are located.
2. The wind turbine generator lubrication and cooling system according to claim 1, characterized in that: A branch oil passage three (12) is provided on the main oil passage (3) at a position between the oil pump one (2) and the filter one (11). The end of the branch oil passage three (12) away from the main oil passage (3) is located in the oil tank (1). A safety valve one (13) is provided on the branch oil passage three (12).
3. The wind turbine generator lubrication and cooling system according to claim 1, characterized in that... A throttle valve (14) and a solenoid valve (15) are sequentially arranged along the flow direction of the oil in the branch oil circuit (7).
4. The wind turbine generator lubrication and cooling system according to claim 1, characterized in that: The circulating oil circuit (23) is provided with a branch oil circuit four (27), one end of the branch oil circuit four (27) is connected to the circulating oil circuit (23), and the other end of the branch oil circuit four (27) is connected to the oil tank (1). A safety valve two (28) is provided on the branch oil circuit four (27).
5. A control method for a wind turbine generator lubrication and cooling system, employing the wind turbine generator lubrication and cooling system described in any one of claims 1-4, characterized in that: Includes the following steps: S100: Start oil pump 1 (2) to make oil flow in the main oil circuit (3). At the same time, the dielectric constant detection sensor (26) detects the dielectric constant of the oil in the main oil circuit (3) and compares the detected value with the preset warning value K1, threshold K2 and limit value K3. S200: Compare the dielectric constant of the oil with the warning value K1; If the dielectric constant in the oil is greater than the warning value K1, then oil pump one (2) starts normally and oil pump two (24) is in standby mode; If the dielectric constant of the oil is less than the warning value K1, then the dielectric constant of the oil is compared with the limit value K3. S300: If the dielectric constant in the oil is greater than the limit K3, then start oil pump two (24), while oil pump one (2) continues to run. If the dielectric constant in the oil is less than the limit K3, then oil pump 2 (24) starts, while oil pump 1 (2) continues to run. The solenoid valve (15) disconnects the branch oil circuit 1 (7), and the generator (5) stops running. S400: When oil pump two (24) is started, the dielectric constant of the oil is compared with the threshold K2 again; If the dielectric constant of the oil is less than K2, then the dielectric constant of the oil is compared with the limit K3 again, and step S300 is repeated until the dielectric constant of the oil is greater than K2. If the dielectric constant of the oil is greater than K2, then the second oil pump (24) stops running, and the solenoid valve (15) changes from open to closed. The oil in the main oil circuit (3) flows back into the generator (5), and the generator (5) operates normally.