Servo hydraulic flow matching power source for wind power hydraulic variable pitch system

Abstract

The invention relates to the field of wind power generation equipment, and discloses a servo hydraulic flow matching power source for a wind power hydraulic variable pitch system, which comprises an integrated block mounted in a wind power hub; the integrated block comprises a servo motor and a gear pump, the servo motor and the gear pump are installed on the integrated block, and the servo motor is connected with the gear pump through a coupler; and the control valve group is mounted on the integrated block, and an oil outlet of the gear pump is connected with the control valve group. According to the hydraulic system, key characters such as temperature and viscosity of hydraulic oil are monitored in real time through the integrated oil monitoring mechanism, it is ensured that operation parameters of the hydraulic system are in the optimal state all the time, and the controller dynamically adjusts the operation parameters of the servo motor and the control valve set according to the state, monitored in real time, of the hydraulic oil; the hydraulic oil character under the current environment condition is matched, and high-precision control over the flow and the pressure is achieved.

Description

Technical Field

[0001] The present invention relates to the field of wind power generation equipment, and particularly to a servo hydraulic flow matching power source for a wind power hydraulic pitch system. Background Art

[0002] In the pitch actuator of a wind turbine generator, hydraulic power is a common power source. Its main principle is to use a hydraulic system to pump oil into the actuator, so as to achieve the purpose of rotating the pitch angle. The advantages of hydraulic power are strong power and high reliability, which are suitable for large wind turbine generators.

[0003] The installation environments of wind power generation equipment in different regions vary greatly. For example, in the low-temperature environment of northern cities, the high-temperature environment of southern cities, the environment with high humidity and the dry environment of northwestern cities, the properties of the oil are different in different environments. In the low-temperature environment, the viscosity of the hydraulic oil will increase and the fluidity will decrease, resulting in an increase in the working pressure of the hydraulic system and a decrease in the flow rate, affecting the response speed and accuracy of the system.

[0004] The existing wind power hydraulic pitch system cannot adjust the output state of the power source according to the real-time state of the hydraulic oil, lacks a high-precision control and real-time monitoring system, and is difficult to match the required flow rate and pressure of the pitch, affecting the accuracy and stability of the pitch system. Summary of the Invention

[0005] (1) Technical Problems to be Solved

[0006] Aiming at the deficiencies of the existing technology, the present invention provides a servo hydraulic flow matching power source for a wind power hydraulic pitch system, which solves the problems that the existing wind power hydraulic pitch system cannot adjust the output state of the power source according to the real-time state of the hydraulic oil, lacks a high-precision control and real-time monitoring system, is difficult to match the required flow rate and pressure of the pitch, and affects the accuracy and stability of the pitch system.

[0007] (2) Technical Solutions

[0008] To achieve the above objectives, the present invention is realized through the following technical solutions.

[0009] A servo-hydraulic flow matching power source for a wind power hydraulic pitch system, comprising: an integrated block installed inside a wind power hub; the integrated block includes a servo motor and a gear pump, the servo motor and the gear pump are installed on the integrated block, and the servo motor is connected to the gear pump through a coupling; a control valve group installed on the integrated block, the oil outlet of the gear pump is connected to the control valve group, and the control valve group is used to adjust the flow direction and pressure of the hydraulic oil according to a control signal; an oil monitoring mechanism installed inside the integrated block, and the oil monitoring mechanism is used to monitor the temperature and viscosity of the hydraulic oil entering the integrated block; a controller installed inside the integrated block, the controller is electrically connected to the oil monitoring mechanism, the servo motor and the control valve group, and the controller is used to adjust the operating parameters of the servo motor and the control valve group according to the temperature and viscosity of the hydraulic oil.

[0010] In one embodiment, the oil monitoring mechanism includes: a first temperature sensor and a first viscosity sensor installed inside the integrated block, and the first temperature sensor and the first viscosity sensor are used to monitor the temperature and viscosity of the hydraulic oil entering the integrated block.

[0011] Preferably, the oil monitoring mechanism further includes: a second temperature sensor and a second viscosity sensor integrated inside the integrated block, the second temperature sensor and the second viscosity sensor are connected inside the oil outlet pipe of the gear pump, and the second temperature sensor and the second viscosity sensor are used to monitor the temperature and viscosity of the hydraulic oil inside the oil outlet.

[0012] Preferably, the oil monitoring mechanism further includes: a three-way valve integrated inside the integrated block; two inlet pipes, one end of each of the two inlet pipes is connected to the oil inlet of the gear pump, and the other ends of the two inlet pipes are respectively connected to the two output ports of the three-way valve.

[0013] Preferably, the oil monitoring mechanism further includes: a heating element installed on one of the two inlet pipes, and the heating element is used to heat the hydraulic oil.

[0014] In one embodiment, the integrated block includes: an oil suction circuit block installed at the bottom of the integrated block, and an oil suction port is connected to the oil suction circuit block; an oil suction pipeline, one end of which is installed on the oil suction circuit block, and the other end is installed on the input port of the three-way valve, the oil suction pipeline is connected to the two inlet pipes through the three-way valve, and both the first temperature sensor and the first viscosity sensor are installed inside the oil suction pipeline.

[0015] Preferably, the integrated block further includes: an oil outlet pipeline, integrated within the integrated block, one end of the oil outlet pipeline is connected to the gear pump, and the control valve group is connected to the oil outlet pipeline; an output port A and an output port B, installed on the integrated block, the other end of the oil outlet pipeline is communicated with the output port A and the output port B; an output port P, installed on the integrated block, the gear pump is connected to the output port P through the oil outlet pipeline; a plurality of pressure measuring joints, and the plurality of pressure measuring joints are installed on the integrated block.

[0016] In one embodiment, the control valve group includes: a proportional servo valve, installed on the integrated block, the proportional servo valve is connected to the oil outlet pipeline, the proportional servo valve is connected to the gear pump through the oil outlet pipeline, and the proportional servo valve is used to adjust the flow rate and pressure of the hydraulic oil according to the control signal; a solenoid valve, installed on the integrated block, the solenoid valve is connected to the oil outlet pipeline, and the solenoid valve is used to control the flow direction of the hydraulic oil; a first pressure sensor, installed on the integrated block, the first pressure sensor is connected to the oil outlet pipeline; a high-pressure oil filter, installed on the integrated block, the high-pressure oil filter is connected to the oil outlet pipeline; a relief valve, installed on the integrated block; a check valve, installed on the integrated block, and the check valve is connected to the oil outlet pipeline.

[0017] In one embodiment, it further includes three pitch cylinders, which are installed inside the wind turbine hub, and the control valve group is connected to the pitch cylinders through the output port A and the output port B.

[0018] Preferably, the pitch cylinder includes: a displacement sensor and a second pressure sensor, installed inside the pitch cylinder, and the controller is connected to the displacement sensor and the second pressure sensor.

[0019] (III) Beneficial effects

[0020] The present invention provides a servo hydraulic flow matching power source for a wind power hydraulic pitch system. Compared with the prior art, it has the following beneficial effects:

[0021] A servo-hydraulic flow matching power source for a wind power hydraulic pitch system proposed in this application includes: an integrated block installed inside a wind power hub; the integrated block includes a servo motor and a gear pump, the servo motor and the gear pump are installed on the integrated block, and the servo motor is connected to the gear pump through a coupling; a control valve group installed on the integrated block, the oil outlet of the gear pump is connected to the control valve group, and the control valve group is used to adjust the flow direction and pressure of the hydraulic oil according to a control signal; an oil fluid monitoring mechanism installed inside the integrated block, and the oil fluid monitoring mechanism is used to monitor the temperature and viscosity of the hydraulic oil entering the integrated block; through the integrated oil fluid monitoring mechanism, key properties such as the temperature and viscosity of the hydraulic oil are monitored in real time to ensure that the operating parameters of the hydraulic system are always in the best state. The controller dynamically adjusts the operating parameters of the servo motor and the control valve group according to the real-time monitored state of the hydraulic oil to match the properties of the hydraulic oil under the current environmental conditions, so as to achieve high-precision control of the flow rate and pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a layout schematic diagram of the present invention inside a wind power hub.

[0024] Figure 2 It is a structural schematic diagram of the present invention.

[0025] Figure 3 It is a structural schematic diagram of another perspective of the present invention.

[0026] Figure 4 It is a structural schematic diagram of the pitch cylinder of the present invention.

[0027] Figure 5 It is a structural schematic diagram of the servo motor, gear pump, proportional servo valve and oil fluid monitoring mechanism of the present invention.

[0028] The reference numerals in the drawings are:

[0029] 1. Servo motor; 2. Control valve group; 3. Gear pump; 4. Suction oil circuit block; 5. Integrated block; 6. Proportional servo valve; 7. Solenoid valve; 8. First pressure sensor; 9. High-pressure oil filter; 10. Relief valve; 11. Check valve; 12. Suction port; 13. Output port A; 14. Output port B; 15. Output port P; 16. Pressure measuring joint; 17. Oil outlet pipeline; 18. Suction oil pipeline; 19. Pitch cylinder; 20. Displacement sensor; 21. Second pressure sensor; 22. Three-way valve; 23. Inlet pipe; 24. Heating element; 25. First temperature sensor; 26. First viscosity sensor; 27. Controller; 28. Second temperature sensor; 29. Second viscosity sensor. Detailed implementation manners

[0030] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] Embodiment 1

[0032] Referring to Figure 1 、 Figure 2 and Figure 5 , a servo hydraulic flow matching power source for a wind power hydraulic pitch system includes: an integrated block 5 installed inside a wind power hub; the integrated block 5 includes a servo motor 1 and a gear pump 3, the servo motor 1 and the gear pump 3 are installed on the integrated block 5, and the servo motor 1 is connected to the gear pump 3 through a coupling; a control valve group 2 installed on the integrated block 5, an oil outlet of the gear pump 3 is connected to the control valve group 2, and the control valve group 2 is used to adjust the flow direction and pressure of hydraulic oil according to a control signal; an oil fluid monitoring mechanism installed inside the integrated block 5, and the oil fluid monitoring mechanism is used to monitor the temperature and viscosity of the hydraulic oil entering the integrated block 5; a controller 27 installed inside the integrated block 5, the controller 27 is electrically connected to the oil fluid monitoring mechanism, the servo motor 1 and the control valve group 2, and the controller 27 is used to adjust the operating parameters of the servo motor 1 and the control valve group 2 according to the temperature and viscosity of the hydraulic oil.

[0033] Referring to Figure 5, the oil fluid monitoring mechanism includes: a first temperature sensor 25 and a first viscosity sensor 26, which are installed in the integrated block 5. The first temperature sensor 25 and the first viscosity sensor 26 are used to monitor the temperature and viscosity of the hydraulic oil entering the integrated block 5; a second temperature sensor 28 and a second viscosity sensor 29, which are integrated in the integrated block 5. The second temperature sensor 28 and the second viscosity sensor 29 are connected in the oil outlet pipe of the gear pump 3. The second temperature sensor 28 and the second viscosity sensor 29 are used to monitor the temperature and viscosity of the hydraulic oil in the oil outlet.

[0034] In this embodiment, the first temperature sensor 25, the first viscosity sensor 26, the second temperature sensor 28, and the second viscosity sensor 29 are used to monitor the temperature and viscosity of the hydraulic oil in real time. The collected data is transmitted to the controller 27 through the sensor interface. The controller 27 preprocesses the received data, including data cleaning, outlier detection, etc., calculates the deviation between the current hydraulic oil temperature and viscosity and the set value, and adjusts the parameters in the control algorithm according to the deviation of the hydraulic oil temperature and viscosity; the controller 27 converts the adjusted control parameters into control signals and outputs them to the servo motor 1 and the proportional servo valve 6; the servo motor 1 adjusts the output power and speed according to the control signal, and the proportional servo valve 6 adjusts the opening according to the control signal to achieve dynamic control of the flow rate, pressure, and speed of the hydraulic system; the working state of the hydraulic system is monitored in real time, including parameters such as pressure, flow rate, and speed; the monitored data is compared with the system set value. If there is a difference, the control algorithm is corrected through the feedback mechanism to further improve the control accuracy and stability of the system.

[0035] The above-mentioned controller 27 includes a CPU, a memory, and an input / output module. The CPU is responsible for running the control algorithm, the memory is used to store programs and data, and the input / output module is used to communicate with sensors and actuators.

[0036] The control algorithm of the controller 27 adopts the PID (Proportional-Integral-Derivative) control algorithm, or the discrete PID control algorithm can also be adopted. Among them, the PID (Proportional-Integral-Derivative) control algorithm adjusts the control output by calculating the deviation between the current measured value and the set value and based on the proportional (P), integral (I), and derivative (D) parts of this deviation.

[0037] The output u(t) of the PID controller is calculated based on the proportional (P), integral (I), and derivative (D) of the input deviation e(t). The specific formula is:

[0038]

[0039] Where:

[0040] K P is the proportionality coefficient;

[0041] K i is the integral coefficient;

[0042] K d is the differential coefficient;

[0043] e(t) is the input deviation, that is, the difference between the set value and the measured value.

[0044] Temperature deviation calculation: e temp (k) = set temperature - current temperature (k).

[0045] Viscosity deviation calculation: e viscosity (k) = set viscosity - current viscosity (k).

[0046] PID output calculation:

[0047]

[0048] Among them, and are the PID parameters for temperature control respectively.

[0049] Assume that the rated power of servo motor 1 is P max , then the adjusted output power is:

[0050]

[0051] Among them, P initial is the initial output power of servo motor 1.

[0052] Assume that the maximum opening of proportional servo valve 6 is V max , then the adjusted opening is:

[0053]

[0054] Among them, V initial is the initial opening of proportional servo valve 6, and u viscosity (k) is the PID output for viscosity control.

[0055] Referring to Figure 5 , the three-way valve 22 is integrated in the integrated block 5; the oil inlet pipes 23 are two in number, one end of each of the two oil inlet pipes 23 is connected to the oil inlet of the gear pump 3, and the other ends of the two oil inlet pipes 23 are respectively connected to the two output ports of the three-way valve 22; the heating element 24 is installed on one of the two oil inlet pipes 23, and the heating element 24 is used to heat the hydraulic oil.

[0056] The above three-way valve 22 realizes the function of splitting the hydraulic oil. When the first temperature sensor 25 or the first viscosity sensor 26 detects a decrease in the temperature or an increase in the viscosity of the hydraulic oil, the hydraulic oil is switched to the oil inlet pipe 23 with the heating element 24 for transportation. During the transportation of the hydraulic oil, the heating element 24 heats the hydraulic oil, and it starts when the temperature of the hydraulic oil is too low to increase the oil temperature, reduce the viscosity, and improve the fluidity. The heating element 24 uses an electric heating rod or a heating tape can also be used to ensure that the hydraulic oil can maintain an appropriate viscosity and fluidity in a low-temperature environment.

[0057] Referring to Figure 2 and Figure 3 , the integrated block 5 includes: an oil suction circuit block 4 installed at the bottom of the integrated block 5, and an oil suction port 12 is connected to the oil suction circuit block 4; an oil suction pipeline 18, one end of which is installed on the oil suction circuit block 4 and the other end is installed on the input port of the three-way valve 22. The oil suction pipeline 18 is connected to two oil inlet pipes 23 through the three-way valve 22. The first temperature sensor 25 and the first viscosity sensor 26 are both installed in the oil suction pipeline 18; an oil outlet pipeline 17 is integrated in the integrated block 5. One end of the oil outlet pipeline 17 is connected to the gear pump 3, and the control valve group 2 is connected to the oil outlet pipeline 17; an output port A 13 and an output port B 14 are installed on the integrated block 5, and the other end of the oil outlet pipeline 17 is communicated with the output port A 13 and the output port B 14; an output port P 15 is installed on the integrated block 5, and the gear pump 3 is connected to the output port P 15 through the oil outlet pipeline 17; there are several pressure measuring joints 16, and several of the pressure measuring joints 16 are installed on the integrated block 5.

[0058] In this embodiment, the integrated block 5, as the core component of the entire servo hydraulic flow matching power source, is installed in the wind power hub and integrates multiple hydraulic and electrical components; it is designed compactly and can accommodate key components such as the servo motor 1, the gear pump 3, the control valve group 2, the oil fluid monitoring mechanism, and the controller 27; the servo motor 1 provides the power source, and the flow rate and pressure of the hydraulic system are adjusted by controlling its speed and power. It is directly connected to the gear pump 3 through a coupling to achieve power transmission; the gear pump 3 uses a high-precision gear pump 3 to convert mechanical energy into hydraulic energy. The pressure measuring joints 16 are used to monitor the pressure at various parts of the hydraulic system and provide data support for the maintenance and troubleshooting of the system.

[0059] Referring to Figures 1-3, the control valve group 2 includes: a proportional servo valve 6 installed on the integrated block 5. The proportional servo valve 6 is connected to the oil outlet pipeline 17, and the proportional servo valve 6 is connected to the gear pump 3 through the oil outlet pipeline 17. The proportional servo valve 6 is used to adjust the flow rate and pressure of the hydraulic oil according to the control signal; a solenoid valve 7 installed on the integrated block 5. The solenoid valve 7 is connected to the oil outlet pipeline 17, and the solenoid valve 7 is used to control the flow direction of the hydraulic oil; a first pressure sensor 8 installed on the integrated block 5. The first pressure sensor 8 is connected to the oil outlet pipeline 17; a high-pressure oil filter 9 installed on the integrated block 5. The high-pressure oil filter 9 is connected to the oil outlet pipeline 17; a relief valve 10 installed on the integrated block 5; a check valve 11 installed on the integrated block 5. The check valve 11 is connected to the oil outlet pipeline 17. There are three pitch cylinders 19 installed inside the wind power hub. The control valve group 2 is connected to the pitch cylinders 19 through the output port A 13 and the output port B 14.

[0060] The above-mentioned proportional servo valve 6 changes the flow rate and pressure of the hydraulic oil by adjusting the opening degree of the valve core; the solenoid valve 7 is used to control the flow direction of the hydraulic oil to realize the commutation function of the hydraulic system; the first pressure sensor 8 monitors the pressure of the oil outlet pipeline 17 in real time and provides a feedback signal to the controller 27; the high-pressure oil filter 9 filters impurities in the hydraulic oil to protect the system from pollution; the relief valve 10 prevents the system pressure from being too high to protect the system safety; the check valve 11 ensures that the hydraulic oil can only flow in one direction and prevents backflow.

[0061] Embodiment 2

[0062] The difference between this embodiment and Embodiment 1 is that:

[0063] Refer to Figure 4 , a displacement sensor 20 and a second pressure sensor 21 are installed inside the pitch cylinder 19. The controller 27 is connected to the displacement sensor 20 and the second pressure sensor 21.

[0064] In this embodiment, the second pressure sensor 21 monitors the pressure of the pitch cylinder 19 in real time, the displacement sensor 20 monitors the position and movement speed of the pitch cylinder 19 in real time. The controller 27 collects the pitch command, collects the pitch position through the displacement sensor 20 on the pitch cylinder 19, collects the pitch load pressure through the second pressure sensor 21 on the pitch cylinder 19, calculates the required flow rate and pressure of the pitch system. The controller 27 generates corresponding control signals according to the calculated control parameters. These control signals are transmitted to the actuators such as the servo motor 1 and the proportional servo valve 6 through cables or wirelessly, controls the start of the servo motor 1, opens the proportional servo valve 6, and adjusts the rotation speed of the servo motor 1 and the opening degree of the proportional servo valve 6 in real time to match the required flow rate and pressure of the pitch, and completes the precise pitch action.

[0065] The above displacement sensor 20 monitors the position and movement speed of the pitch cylinder 19 in real time, and converts this information into electrical signals and outputs them to the controller 27. At the same time, the second pressure sensor 21 monitors the pressure change in the cylinder in real time, and also converts this information into electrical signals and outputs them to the controller 27. After receiving the signals from the displacement sensor 20 and the pressure sensor, the controller 27 calculates the control parameters according to the preset control algorithm. These control parameters include the rotation speed of the servo motor 1, the opening degree of the proportional servo valve 6, etc., and are used to match the flow rate and pressure required by the pitch system. The controller 27 generates corresponding control signals according to the calculated control parameters, and transmits them to the actuators such as the servo motor 1 and the proportional servo valve 6 through cables or wirelessly. After receiving the control signals, the actuators adjust their own operating states in real time. The servo motor 1 adjusts its rotation speed according to the control signal, and the proportional servo valve 6 adjusts its opening degree according to the control signal, so as to match the flow rate and pressure required by the pitch system. By continuously adjusting the states of the actuators, the system can achieve precise control of the pitch cylinder 19, thereby completing precise pitch actions.

[0066] The following briefly introduces the usage principle and method of a servo hydraulic flow matching power source for a wind power hydraulic pitch system proposed in this application:

[0067] The servo motor 1 serves as a power source and is directly connected to the gear pump 3 through a coupling to achieve power transmission. When the servo motor 1 rotates, it drives the gear pump 3 to work, sucking hydraulic oil from the fuel tank, pressurizing it, and then delivering it to the hydraulic system.

[0068] The oil monitoring mechanism monitors the temperature and viscosity of the hydraulic oil entering the integrated block 5 in real time. The controller 27 adjusts the operating parameters of the servo motor 1 and the control valve group 2 according to the monitored data to ensure that the temperature and viscosity of the hydraulic oil are maintained within an appropriate range. When the temperature of the hydraulic oil is too low or the viscosity is too high, the controller 27 switches the hydraulic oil to the inlet pipe 23 with a heating element 24 through the three-way valve 22 for heating, so as to increase the oil temperature, reduce the viscosity, and improve the fluidity.

[0069] The control valve group 2 includes components such as a proportional servo valve 6 and a solenoid valve 7. They adjust the flow rate and pressure of the hydraulic oil according to the instructions of the controller 27. The proportional servo valve 6 changes the flow rate and pressure of the hydraulic oil by adjusting the opening degree of the valve core, so as to meet the requirements of the pitch system. The solenoid valve 7 is used to control the flow direction of the hydraulic oil to achieve the commutation function of the hydraulic system.

[0070] During the pitch process, the displacement sensor 20 and the second pressure sensor 21 monitor the position, movement speed of the pitch cylinder 19 and the pressure change in the cylinder in real time. After receiving these signals, the controller 27 calculates the control parameters according to the preset control algorithm, including the rotation speed of the servo motor 1, the opening of the proportional servo valve 6, etc. The controller 27 converts the adjusted control parameters into control signals and outputs them to the actuators such as the servo motor 1 and the proportional servo valve 6. After receiving the control signals, the actuators adjust their own operating states in real time to match the flow rate and pressure required by the pitch system, thereby completing the precise pitch action.

[0071] The servo-hydraulic flow matching power source system starts, and components such as the servo motor 1, gear pump 3, and control valve group 2 in the integrated block 5 start to work. The first temperature sensor 25 and the first viscosity sensor 26 monitor the temperature and viscosity of the hydraulic oil entering the integrated block 5. The data is transmitted to the controller 27 through the sensor interface. The controller 27 preprocesses the received data, including data cleaning, outlier detection, etc. When the temperature of the hydraulic oil is too low or the viscosity is too high, the controller 27 switches the hydraulic oil to the inlet pipe 23 with the heating element 24 through the three-way valve 22 for heating. The heating element 24 works to increase the oil temperature and reduce the viscosity. The first pressure sensor 8 monitors the pressure of the oil outlet pipeline 17 in real time. The controller 27 calculates the required flow rate and pressure of the current hydraulic system based on the data from the pressure sensor and in combination with the preset control algorithm. The controller 27 generates corresponding control signals and transmits them to the proportional servo valve 6 and the solenoid valve 7 through cables or wirelessly. The proportional servo valve 6 adjusts the opening degree of the valve core according to the control signal, thereby changing the flow rate and pressure of the hydraulic oil. The solenoid valve 7 controls the flow direction of the hydraulic oil according to the control signal to achieve the commutation function of the hydraulic system. The displacement sensor 20 monitors the position and movement speed of the pitch cylinder 19 in real time and converts the information into an electrical signal and outputs it to the controller 27. The second pressure sensor 21 monitors the pressure change in the pitch cylinder 19 in real time and converts the information into an electrical signal and outputs it to the controller 27. After receiving the signals from the displacement sensor 20 and the pressure sensor, the controller 27 calculates the control parameters according to the preset control algorithm. These control parameters include the rotation speed of the servo motor 1, the opening degree of the proportional servo valve 6, etc., and are used to match the flow rate and pressure required by the pitch system. The controller 27 converts the adjusted control parameters into control signals and outputs them to the actuators such as the servo motor 1 and the proportional servo valve 6. The servo motor 1 adjusts the rotation speed according to the control signal, and the proportional servo valve 6 adjusts the opening degree according to the control signal. By continuously adjusting the state of the actuator, the system can achieve precise control of the pitch cylinder 19. The pitch cylinder 19 completes precise pitch actions according to the control signal. The system monitors the working state of the hydraulic system in real time, including parameters such as pressure, flow rate, and speed. The controller 27 compares the monitored data with the system set value. If there is a difference, the controller 27 corrects the control algorithm through the feedback mechanism to further improve the control accuracy and stability of the system. The pressure measuring joint 16 is used to monitor the pressure at various parts of the hydraulic system and provides data support for the maintenance and fault troubleshooting of the system. When a fault occurs in the system, the controller 27 will issue an alarm signal and indicate the fault location. Maintenance personnel can quickly locate and repair the fault according to the alarm information.

[0072] In summary, compared with the prior art, a servo-hydraulic flow matching power source for a wind power hydraulic pitch system proposed in this application has the following beneficial effects:

[0073] Through the integrated oil monitoring mechanism, the key properties of the hydraulic oil such as temperature and viscosity are monitored in real time to ensure that the operating parameters of the hydraulic system are always in the best state. The controller 27 dynamically adjusts the operating parameters of the servo motor 1 and the control valve group 2 according to the real-time monitored hydraulic oil state to match the properties of the hydraulic oil under the current environmental conditions, thereby achieving high-precision control of flow and pressure.

[0074] The hydraulic oil is heated by the heating element 24 to reduce its viscosity and improve its fluidity, thereby maintaining the normal working pressure and flow of the hydraulic system.

[0075] Through real-time monitoring and dynamic adjustment, the system can accurately match the flow and pressure required by the pitch system, thereby improving the accuracy and stability of the pitch operation. Since the system can sense and adjust the state of the hydraulic oil in real time, the response speed of the hydraulic system can be significantly improved, making the pitch operation faster and more accurate.

[0076] The servo hydraulic power source is used to accurately match the flow and pressure of the pitch hydraulic system. When the pitch hydraulic system operates, it can promptly and quickly ensure the flow and pressure requirements of the system. When the pitch hydraulic system is on standby, it can operate with low power consumption, saving energy and reducing consumption. At the same time, the servo motor 1 has the characteristics of simple starting logic and short starting time, adapting to the frequent start of the pitch system, with small pressure fluctuations, and can supply oil at a constant pressure, greatly improving the accuracy of the pitch system.

[0077] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

[0078] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A servo hydraulic flow matching power source for a wind power hydraulic pitch system, characterized in that Comprising: An integrated block (5), installed inside the wind power hub; The integrated block (5) includes a servo motor (1) and a gear pump (3). The servo motor (1) and the gear pump (3) are installed on the integrated block (5), and the servo motor (1) is connected to the gear pump (3) through a coupling; A control valve group (2), installed on the integrated block (5). The oil outlet of the gear pump (3) is connected to the control valve group (2), and the control valve group (2) is used to adjust the flow direction and pressure of the hydraulic oil according to a control signal; An oil fluid monitoring mechanism, installed inside the integrated block (5), and the oil fluid monitoring mechanism is used to monitor the temperature and viscosity of the hydraulic oil entering the integrated block (5); A controller (27), installed inside the integrated block (5). The controller (27) is electrically connected to the oil fluid monitoring mechanism, the servo motor (1), and the control valve group (2), and the controller (27) is used to adjust the operating parameters of the servo motor (1) and the control valve group (2) according to the temperature and viscosity of the hydraulic oil.

2. The servo-hydraulic flow matching power source according to claim 1, wherein The oil fluid monitoring mechanism includes: A first temperature sensor (25) and a first viscosity sensor (26), installed inside the integrated block (5), and the first temperature sensor (25) and the first viscosity sensor (26) are used to monitor the temperature and viscosity of the hydraulic oil entering the integrated block (5).

3. The servo-hydraulic flow matching power source according to claim 2, characterized in that, The oil fluid monitoring mechanism further includes: A second temperature sensor (28) and a second viscosity sensor (29), integrated inside the integrated block (5). The second temperature sensor (28) and the second viscosity sensor (29) are connected inside the oil outlet pipe of the gear pump (3), and the second temperature sensor (28) and the second viscosity sensor (29) are used to monitor the temperature and viscosity of the hydraulic oil inside the oil outlet.

4. The servo-hydraulic flow matching power source according to claim 2, wherein, The oil fluid monitoring mechanism further includes: A three-way valve (22), integrated inside the integrated block (5); Oil inlet pipes (23), the number of which is two. One ends of the two oil inlet pipes (23) are connected to the oil inlet of the gear pump (3), and the other ends of the two oil inlet pipes (23) are respectively connected to two output ports of the three-way valve (22).

5. The servo-hydraulic flow matching power source according to claim 4, wherein, The oil fluid monitoring mechanism further includes: A heating element (24), installed on one of the two oil inlet pipes (23), and the heating element (24) is used to heat the hydraulic oil.

6. The servo-hydraulic flow matching power source according to claim 4, wherein The integrated block (5) includes: An oil suction circuit block (4), installed at the bottom of the integrated block (5), and an oil suction port (12) is connected to the oil suction circuit block (4); An oil suction pipeline (18), one end of which is installed on the oil suction circuit block (4), and the other end is installed on the input port of the three-way valve (22). The oil suction pipeline (18) is connected to the two oil inlet pipes (23) through the three-way valve (22), and the first temperature sensor (25) and the first viscosity sensor (26) are both installed inside the oil suction pipeline (18).

7. The servo-hydraulic flow matching power source according to claim 6, wherein The integrated block (5) further includes: An oil outlet pipeline (17), integrated inside the integrated block (5). One end of the oil outlet pipeline (17) is connected to the gear pump (3), and the control valve group (2) is connected to the oil outlet pipeline (17); Output port A (13) and output port B (14) are installed on the integrated block (5), and the other end of the oil outlet pipeline (17) is communicated with output port A (13) and output port B (14); Output port P (15) is installed on the integrated block (5), and the gear pump (3) is connected to output port P (15) through the oil outlet pipeline (17); Pressure measuring joints (16), with several in number, are installed on the integrated block (5).

8. The servo-hydraulic flow matching power source according to claim 7, characterized in that, The control valve group (2) includes: A proportional servo valve (6) is installed on the integrated block (5). The proportional servo valve (6) is connected to the oil outlet pipeline (17), and the proportional servo valve (6) is connected to the gear pump (3) through the oil outlet pipeline (17). The proportional servo valve (6) is used to adjust the flow rate and pressure of the hydraulic oil according to the control signal; An electromagnetic valve (7) is installed on the integrated block (5). The electromagnetic valve (7) is connected to the oil outlet pipeline (17), and the electromagnetic valve (7) is used to control the flow direction of the hydraulic oil; A first pressure sensor (8) is installed on the integrated block (5). The first pressure sensor (8) is connected to the oil outlet pipeline (17); A high-pressure oil filter (9) is installed on the integrated block (5). The high-pressure oil filter (9) is connected to the oil outlet pipeline (17); A relief valve (10) is installed on the integrated block (5); A check valve (11) is installed on the integrated block (5). The check valve (11) is connected to the oil outlet pipeline (17).

9. The servo-hydraulic flow matching power source according to any one of claims 1-8, characterized in that The servo hydraulic flow matching power source further includes: Pitch cylinders (19), with three in number, are installed inside the wind power hub. The control valve group (2) is connected to the pitch cylinders (19) through output port A (13) and output port B (14).

10. The servo-hydraulic flow matching power source according to claim 9, characterized in that, The pitch cylinder (19) includes: A displacement sensor (20) and a second pressure sensor (21) are installed inside the pitch cylinder (19). The controller (27) is connected to the displacement sensor (20) and the second pressure sensor (21).

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