A yaw / pitch system for a wind turbine and its control method

Abstract

The present invention provides a yaw / pitch system for a wind turbine in the technical field of wind turbine technology. The present invention also relates to a control method for a yaw / pitch system of a wind turbine. A bearing inner ring rotor (16) and a stator (15) are arranged inside an outer ring (17) of a bearing of a hydraulic angle regulator (1) of the yaw / pitch system of the wind turbine. The stator (15) is connected to a tower / hub, and the bearing inner ring rotor (16) is connected to a nacelle / blade. Two oil cavities lead out two oil circuits through a cover plate (13) or lead out two oil circuits through a rod portion of the stator (15). Each oil circuit is externally connected to a pressure sensor respectively. One oil circuit is connected to an A interface (18) of an oil control valve (21), and the other oil circuit is connected to a B interface (19) of the oil control valve (21). The yaw / pitch system of the wind turbine of the present invention drives the blade / nacelle to rotate by integrating a hydraulic angle regulator with a pitch bearing / yaw bearing, and has the characteristics of high integration, high precision, and high reliability.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind turbine units, and more specifically, relates to a yaw / pitch system of a wind turbine unit. The present invention also relates to a control method for a yaw / pitch system of a wind turbine unit. Background Art

[0002] With the continuous development of today's society, the shortage of non-renewable energy sources such as coal is becoming increasingly severe. The form of power generation using clean energy will surely replace thermal power mainly based on coal. Wind power generation is the clean energy power generation form with the most conditions for large-scale commercial development at present. In recent years, the installation volume of wind turbine units in China has increased rapidly. The yaw system / pitch system, as one of the core components of a wind turbine unit, plays a crucial role in the stable and efficient operation of the unit. At present, there are mainly two types of yaw / pitch systems (yaw system or pitch system of a wind turbine unit) applied: motor drive structure and hydraulic drive structure. Motor drive structure: The yaw control system calculates the nacelle yaw angle signal based on the current wind direction, converts it into a servo motor electrical signal through a PLC, drives the motor gear to drive the outer gear ring of the yaw bearing to rotate, and drives the nacelle to rotate to the target position to obtain the maximum wind energy. The pitch system calculates the pitch angle signal of the blade based on the current wind speed, converts it into a servo motor electrical signal through a PLC, drives the motor gear to drive the inner gear ring of the pitch bearing to rotate, and drives the blade to rotate to the target position. Hydraulic drive structure: The yaw control system calculates the nacelle yaw angle signal based on the current wind direction, and the hydraulic system drives the in-line cylinder according to the instruction. The in-line cylinder drives the push rod and the synchronous disk to move. The synchronous disk drives the eccentric disk to rotate through the short rotating shaft, connecting rod, and long rotating shaft, and the eccentric disk drives the nacelle to rotate and yaw. The pitch control system calculates the pitch angle signal of the blade based on the current wind speed, and the hydraulic system drives the in-line cylinder according to the instruction. The in-line cylinder drives the push rod and the synchronous disk to move. The synchronous disk drives the eccentric disk to rotate through the short rotating shaft, connecting rod, and long rotating shaft, and the eccentric disk drives the blade to perform pitch change. The software strategy of the motor drive system is complex and the cost is high. For the hydraulic drive form of the in-line cylinder, due to the complex transmission mechanism and too many intermediate transmission structures, the system has low adjustment accuracy and poor reliability. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: aiming at the deficiencies of the prior art, to provide a yaw / pitch system of a wind turbine unit with a simple structure, which directly drives the blade / nacelle to rotate through the integration of a hydraulic angle regulator and a pitch bearing / yaw bearing, and has the advantages of high integration, high precision, high reliability, and low cost.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is:

[0005] The present invention relates to a yaw / pitch system for a wind turbine, which includes a hydraulic angle regulator. The hydraulic angle regulator includes an outer bearing ring, within which an inner bearing ring rotor and a stator are arranged. The stator is connected to the tower / hub, and the inner bearing ring rotor is connected to the nacelle / blade. The stator divides the inner bearing ring rotor into two oil chambers, and two oil circuits are led out from the two oil chambers by a cover plate or by the rod part of the stator. Each oil circuit is externally connected to a pressure sensor respectively. One oil circuit is connected to the A port of an oil control valve, and the other oil circuit is connected to the B port of the oil control valve. The P port of the oil control valve is connected to an accumulator, an oil pump and then to a fuel tank. A pressure sensor is connected in series between the accumulator and the oil control valve. The T port of the oil control valve is directly connected to the fuel tank. The pressure sensor and the angle encoder are respectively connected to a controller.

[0006] The controller of the yaw / pitch system for the wind turbine is configured to be able to receive the electrical signals of each pressure sensor and angle encoder, and transmit a PWM signal to the oil control valve according to the received electrical signals, and control the start and stop of the oil pump.

[0007] An accumulator is connected in series between the oil pump and the oil control valve. The stator divides the inner bearing ring rotor into two oil chambers, namely chamber A and chamber B, and a three-position four-way oil control valve is used to control the opening and closing of the two oil circuits.

[0008] The angle encoder is installed on the outer bearing ring.

[0009] The yaw / pitch system for the wind turbine is configured to be able to adjust and switch among three states: clockwise adjustment state, counterclockwise adjustment state, and stable state.

[0010] When the yaw / pitch system for the wind turbine is in the clockwise adjustment state, when the wind direction / wind speed changes, the PLC calculates the nacelle deflection angle according to the current wind direction / calculates the blade deflection angle according to the current wind speed, and converts it into a duty cycle signal and sends it to the oil control valve to control the opening and closing of the oil circuit connected to the A port and B port, so that the P port is connected to the A port and the T port is connected to the B port. Chamber A in the hydraulic angle regulator is filled with oil, and chamber B discharges oil, causing the inner bearing ring rotor in the hydraulic angle regulator to rotate, thereby driving the nacelle / blade to rotate. The angle encoder feeds back the nacelle / blade angle to the PLC until the target angle is adjusted.

[0011] When the yaw / pitch system of the wind turbine unit is adjusted counterclockwise and the wind direction / wind speed changes, the PLC calculates the nacelle deflection angle based on the current wind direction / calculates the blade deflection angle based on the current wind speed, and converts it into a duty cycle signal to send to the oil control valve, controlling the opening and closing of the oil circuit connected to interfaces A and B, making interface P communicate with interface B, and interface T communicate with interface A. The B chamber in the hydraulic angle regulator is filled with oil, and the A chamber discharges oil, causing the inner ring rotor of the bearing in the hydraulic angle regulator to rotate, driving the nacelle / blade to rotate. The angle encoder feeds back the nacelle / blade angle to the PLC until the target angle is reached.

[0012] When the yaw / pitch system of the wind turbine unit is in a stable state and the wind direction / wind speed remains stable, the PLC controls the oil circuits connected to interfaces A and B of the oil control valve to close simultaneously, making the oil pressures in chambers A and B inside the hydraulic angle regulator equal, and the inner ring rotor of the bearing is stabilized at the target angle position.

[0013] The present invention also relates to a control method for a yaw / pitch system of a wind turbine unit that directly drives the blade / nacelle to rotate by integrating a hydraulic angle regulator with a pitch bearing / yaw bearing, and has the advantages of high integration, high precision, high reliability, and low cost.

[0014] The control steps of the control method for the yaw / pitch system of the wind turbine unit include a clockwise adjustment state, a counterclockwise adjustment state, and a stable state;

[0015] When the yaw / pitch system of the wind turbine unit is in the clockwise adjustment state and the wind direction / wind speed changes, the PLC calculates the nacelle deflection angle based on the current wind direction / calculates the blade deflection angle based on the current wind speed, and converts it into a duty cycle signal to send to the oil control valve, controlling the opening and closing of the oil circuit connected to interfaces A and B, making interface P communicate with interface A, and interface T communicate with interface B. The A chamber in the hydraulic angle regulator is filled with oil, and the B chamber discharges oil, causing the inner ring rotor of the bearing in the hydraulic angle regulator to rotate, thereby driving the nacelle / blade to rotate. The angle encoder feeds back the nacelle / blade angle to the PLC until the target angle is reached.

[0016] When the yaw / pitch system of the wind turbine unit is adjusted counterclockwise and the wind direction / wind speed changes, the PLC calculates the nacelle deflection angle based on the current wind direction / calculates the blade deflection angle based on the current wind speed, and converts it into a duty cycle signal to send to the oil control valve, controlling the opening and closing of the oil circuit connected to interfaces A and B, making interface P communicate with interface B, and interface T communicate with interface A. The B chamber in the hydraulic angle regulator is filled with oil, and the A chamber discharges oil, causing the inner ring rotor of the bearing in the hydraulic angle regulator to rotate, thereby driving the nacelle / blade to rotate. The angle encoder feeds back the nacelle / blade angle to the PLC until the target angle is reached.

[0017] When the yaw / pitch system of the wind turbine is in a stable state, when the wind direction / wind speed remains stable, the PLC controls the oil circuits connected to the A and B ports of the oil control valve to be closed simultaneously, making the oil pressures in the A and B chambers inside the hydraulic angle adjuster equal, and the inner ring rotor of the bearing is stabilized at the target angle position.

[0018] Adopting the technical solution of the present invention can achieve the following beneficial effects:

[0019] The yaw / pitch system of the wind turbine of the present invention can be adjusted and switched among three states: clockwise adjustment state, counterclockwise adjustment state, and stable state through structural settings to meet the requirements of different working states. When the yaw / pitch system of the wind turbine is in the clockwise adjustment state, when the wind direction / wind speed changes, the PLC calculates the nacelle deflection angle according to the current wind direction / calculates the blade deflection angle according to the current wind speed, and converts it into a duty cycle signal and sends it to the oil control valve to control the opening and closing of the oil circuits connected to the A and B ports, making the P port communicate with the A port and the T port communicate with the B port. The A chamber inside the hydraulic angle adjuster is filled with oil, and the B chamber discharges oil, causing the inner ring rotor of the bearing inside the hydraulic angle adjuster to rotate, thereby driving the nacelle / blade to rotate. The angle encoder feeds back the nacelle / blade angle to the PLC until the target angle is reached. When the yaw / pitch system of the wind turbine is in the counterclockwise adjustment state, when the wind direction / wind speed changes, the PLC calculates the nacelle deflection angle according to the current wind direction / calculates the blade deflection angle according to the current wind speed, and converts it into a duty cycle signal and sends it to the oil control valve to control the opening and closing of the oil circuits connected to the A and B ports, making the P port communicate with the B port and the T port communicate with the A port. The B chamber inside the hydraulic angle adjuster is filled with oil, and the A chamber discharges oil, causing the inner ring rotor of the bearing inside the hydraulic angle adjuster to rotate, driving the nacelle / blade to rotate. The angle encoder feeds back the nacelle / blade angle to the PLC until the target angle is reached. When the yaw / pitch system of the wind turbine is in a stable state, when the wind direction / wind speed remains stable, the PLC controls the oil circuits connected to the A and B ports of the oil control valve to be closed simultaneously, making the oil pressures in the A and B chambers inside the hydraulic angle adjuster equal, and the inner ring rotor of the bearing is stabilized at the target angle position. The system of the present invention simplifies the structure of the yaw system / pitch system through the integrated structure of the hydraulic angle adjuster and the yaw bearing / pitch bearing, with high precision, high reliability, and low cost. Connecting an accumulator in series at the back end of the oil pump can reduce the working time of the oil pump and lower the energy consumption. Description of the Drawings

[0020] The following briefly describes the content expressed by each drawing in this specification and the marks in the drawings:

[0021] Figure 1 It is a schematic diagram of the principle of the yaw / pitch system of the wind turbine of the present invention;

[0022] Figure 2 Schematic structural diagram of the hydraulic angle regulator on the cover plate of the yaw / pitch system oil circuit of the wind turbine according to the present invention;

[0023] Figure 3 Schematic structural diagram of the hydraulic angle regulator on the stator of the yaw / pitch system oil circuit of the wind turbine according to the present invention;

[0024] Figure 4 Schematic internal structural diagram of the hydraulic angle regulator on the stator of the yaw / pitch system oil circuit of the wind turbine according to the present invention;

[0025] Figure 5 Schematic oil circuit diagram of the yaw / pitch system of the wind turbine when it is in the clockwise adjustment state according to the present invention;

[0026] Figure 6 Schematic oil circuit diagram of the yaw / pitch system of the wind turbine when it is in the counterclockwise adjustment state according to the present invention;

[0027] Figure 7 Schematic oil circuit diagram of the yaw / pitch system of the wind turbine when it is in the stable state according to the present invention;

[0028] The labels in the drawings are respectively: 1 - hydraulic angle regulator; 2 - encoder (angle encoder); 3 - pressure sensor A; 4 - controller (PLC); 5 - pressure sensor B; 6 - control valve; 7 - pressure sensor C; 8 - accumulator; 9 - check valve; 10 - oil pump; 11 - fuel tank; 12 - oil pipe joint; 13 - cover plate; 14 - sealing ring; 15 - stator; 16 - inner ring rotor of bearing; 17 - outer ring of bearing; 18 - A interface; 19 - B interface; 20 - P interface; 21 - oil control valve; 22 - A chamber; 23 - B chamber; 24, T interface. Detailed implementation manners

[0029] The following further details the specific implementation manners of the present invention, such as the shapes, structures of the components involved, the mutual positions and connection relationships between the parts, the functions of the parts and the working principles, etc., by describing the embodiments with reference to the drawings:

[0030] As shown in the attached Figure 1 - attached Figure 4As shown in the figure, the present invention is a yaw / pitch system for a wind turbine, which includes a hydraulic angle regulator 1. The hydraulic angle regulator 1 includes an outer bearing ring 17, in which an inner bearing ring rotor 16 and a stator 15 are arranged. The stator 15 is connected to the tower / hub. The inner bearing ring rotor 16 is connected to the nacelle / blade. When it is a yaw system for the wind turbine, the stator is connected to the tower, and the inner bearing ring rotor 16 is connected to the nacelle. When it is a pitch system for the wind turbine, the stator 15 is connected to the hub, and the inner bearing ring rotor 16 is connected to the blade. Two protruding parts are arranged inside the inner ring of the inner bearing ring rotor 16. The stator 15 divides the inside of the inner bearing ring rotor 16 into two oil cavities. Two oil circuits are led out from the two oil cavities by a cover plate 13 or two oil circuits are led out from the rod part of the stator 15. Each oil circuit is externally connected to a pressure sensor respectively. One oil circuit is connected to the A port 18 of an oil control valve 21, and the other oil circuit is connected to the B port 19 of the oil control valve 21. The P port 20 of the oil control valve 21 is connected to an accumulator 8, an oil pump 10 and then connected to an oil tank 11. A pressure sensor is connected in series between the accumulator 8 and the oil control valve 21. The T port 22 of the oil control valve 21 is directly connected to the oil tank 11. The pressure sensor and an angle encoder 2 are respectively connected to a controller 4. With the above structure, aiming at the deficiencies in the prior art and based on a unique and ingenious concept, a brand-new technical solution is proposed. As shown in the attached Figure 5 - attached Figure 7As shown, through the structural design, the yaw / pitch system of the wind turbine can be adjusted and switched among three states: clockwise adjustment state, counterclockwise adjustment state, and stable state to meet the requirements of different working conditions. When the yaw / pitch system of the wind turbine is in the clockwise adjustment state, when the wind direction / wind speed changes, the PLC calculates the nacelle deflection angle based on the current wind direction / calculates the blade deflection angle based on the current wind speed, and converts it into a duty cycle signal and sends it to the oil control valve 21 to control the opening and closing of the oil circuit connecting the A port 18 and the B port 19, so that the P port 20 is connected to the A port 18, and the T port 24 is connected to the B port 19. The A chamber 22 in the hydraulic angle adjuster 1 is filled with oil, and the B chamber 23 discharges oil, causing the inner ring rotor 16 of the bearing in the hydraulic angle adjuster 1 to rotate, thereby driving the nacelle / blade to rotate. The angle encoder 2 feeds back the nacelle angle to the PLC until the target angle is reached. When the yaw / pitch system of the wind turbine is in the counterclockwise adjustment state, when the wind direction / wind speed changes, the PLC calculates the nacelle deflection angle based on the current wind direction / calculates the blade deflection angle based on the current wind speed, and converts it into a duty cycle signal and sends it to the oil control valve 21 to control the opening and closing of the oil circuit connecting the A port 18 and the B port 19, so that the P port 20 is connected to the B port 19, and the T port 24 is connected to the A port 18. The B chamber 23 in the hydraulic angle adjuster 1 is filled with oil, and the A chamber 22 discharges oil, causing the inner ring rotor 16 of the bearing in the hydraulic angle adjuster 1 to rotate, thereby driving the nacelle / blade to rotate. The angle encoder 2 feeds back the nacelle angle to the PLC until the target angle is reached. When the yaw / pitch system of the wind turbine is in the stable state, when the wind direction / wind speed remains stable, the PLC controls the oil control valve 20 to simultaneously close the oil circuits connected to the A port 18 and the B port 19, so that the oil pressures in the A chamber 22 and the B chamber 23 inside the hydraulic angle adjuster 1 are equal, and the inner ring rotor 16 of the bearing is stabilized at the target angle position. In the system of the present invention, through the structure integrating the hydraulic angle adjuster with the yaw bearing / pitch bearing, the structure of the yaw system / pitch system is simplified, with high precision, high reliability, and low cost. Connecting an accumulator in series at the back end of the oil pump can reduce the working time of the oil pump and lower the energy consumption. In the system of the present invention, through the structure integrating the hydraulic angle adjuster with the yaw bearing, the structure of the yaw system is simplified, with high precision, high reliability, and low cost. Connecting an accumulator in series at the back end of the oil pump can reduce the working time of the oil pump and lower the energy consumption. The yaw / pitch system of the wind turbine of the present invention has a simple structure, low cost, and high reliability. By integrating the hydraulic angle adjuster with the pitch bearing, it drives the blade to rotate, featuring high integration, high precision, high reliability, and low cost.

[0031] The controller 4 of the yaw / pitch system of the wind turbine is set to be able to receive the electrical signals of each pressure sensor and the angle encoder 2, and transmit PWM signals to the oil control valve 21 according to the received electrical signals, and control the start and stop of the oil pump 10. The pressure sensors include pressure sensor A, pressure sensor B, and pressure sensor C. Each pressure sensor is respectively arranged at different positions to obtain pressure values, and feedback the pressure value signals to the controller, and the controller then controls according to the pressure signals and the angle encoder signals.

[0032] An accumulator 8 is connected in series between the oil pump 10 and the oil control valve 21. The stator 15 divides the bearing inner ring rotor 16 into two oil chambers, namely chamber A 22 and chamber B 23. A three-position four-way oil control valve is used to control the opening and closing of the two oil circuits. The structure is simple and the control is accurate. In the above structure, each oil chamber communicates with an oil circuit, and through control, the change of the oil circuit is realized, so as to achieve the purpose of controlling the rotation of the nacelle, and the control is reliable. The angle encoder 2 is installed on the bearing outer ring 17. The angle encoder is fixedly connected and connected to the controller to realize signal transmission.

[0033] As shown in the Figure 5 - attached Figure 7 figure, the yaw / pitch system of the wind turbine is set to be a structure that can be adjusted and switched between three states: clockwise adjustment state, counterclockwise adjustment state, and stable state. In the above structure, the system is in different states in different situations, meeting the requirements.

[0034] When the yaw / pitch system of the wind turbine is in the clockwise adjustment state, when the wind direction / wind speed changes, the PLC 4 calculates the nacelle deflection angle according to the current wind direction / calculates the blade deflection angle according to the current wind speed, and converts it into a duty cycle signal and sends it to the oil control valve 21 to control the opening and closing of the oil circuit connected to the A port 18 and the B port 19, so that the P port 20 is connected to the A port 18, and the T port 24 is connected to the B port 19. The chamber A 22 in the hydraulic angle regulator 1 is filled with oil, and the chamber B 23 is drained of oil, so that the bearing inner ring rotor 16 in the hydraulic angle regulator 1 rotates, thereby driving the nacelle / blade to rotate. The angle encoder 2 feeds back the nacelle / blade angle to the PLC until the target angle is adjusted.

[0035] When the yaw / pitch system of the wind turbine unit is adjusted counterclockwise, when the wind direction / wind speed changes, PLC4 calculates the nacelle deflection angle based on the current wind direction / calculates the blade deflection angle based on the current wind speed, and converts it into a duty cycle signal to send to the oil control valve 21, controls the opening and closing of the oil circuit connected by the A interface 18 and the B interface 19, makes the P interface 20 communicate with the B interface 19, and the T interface 24 communicate with the A interface 18. The B chamber 23 in the hydraulic angle regulator 1 is filled with oil, and the A chamber 22 is drained of oil, so that the inner ring rotor 16 of the bearing in the hydraulic angle regulator 1 rotates, thereby driving the nacelle / blade to rotate. The angle encoder 2 feeds back the nacelle / blade angle to the PLC until the target angle is adjusted.

[0036] When the yaw / pitch system of the wind turbine unit is in a stable state, when the wind direction / wind speed remains stable, the PLC controls the oil circuit connected by the A interface 18 and the B interface 19 of the oil control valve 20 to be closed simultaneously, so that the oil pressures in the A chamber 22 and the B chamber 23 inside the hydraulic angle regulator 1 are equal, and the inner ring rotor 16 of the bearing is stabilized at the target angle position.

[0037] The present invention also relates to a control method for a yaw / pitch system of a wind turbine unit. The control steps of the control method for the yaw / pitch system of the wind turbine unit include a clockwise adjustment state, a counterclockwise adjustment state, and a stable state. The system and method of the present invention can be applied to the yaw system of a wind turbine unit or the pitch system of a wind turbine unit.

[0038] When the yaw / pitch system of the wind turbine unit is in the clockwise adjustment state, when the wind direction / wind speed changes, PLC4 calculates the nacelle deflection angle based on the current wind direction / calculates the blade deflection angle based on the current wind speed, and converts it into a duty cycle signal to send to the oil control valve 21, controls the opening and closing of the oil circuit connected by the A interface 18 and the B interface 19, makes the P interface 20 communicate with the A interface 18, and the T interface 24 communicate with the B interface 19. The A chamber 22 in the hydraulic angle regulator 1 is filled with oil, and the B chamber 23 is drained of oil, so that the inner ring rotor 16 of the bearing in the hydraulic angle regulator 1 rotates, thereby driving the nacelle / blade to rotate. The angle encoder 2 feeds back the nacelle / blade angle to the PLC until the target angle is adjusted.

[0039] When the yaw / pitch system of the wind turbine unit is adjusted counterclockwise and the wind direction / wind speed changes, the PLC4 calculates the nacelle deflection angle based on the current wind direction / calculates the blade deflection angle based on the current wind speed, and converts it into a duty cycle signal to send to the oil control valve 21, controlling the opening and closing of the oil circuit connecting the A port 18 and the B port 19, so that the P port 20 is connected to the B port 19, and the T port 24 is connected to the A port 18. The B chamber 23 in the hydraulic angle regulator 1 is filled with oil, and the A chamber 22 is drained of oil, causing the inner ring rotor 16 of the bearing in the hydraulic angle regulator 1 to rotate, thereby driving the nacelle / blade to rotate. The angle encoder 2 feeds back the nacelle / blade angle to the PLC until the target angle is reached.

[0040] When the yaw / pitch system of the wind turbine unit is in a stable state and the wind direction / wind speed remains stable, the PLC controls the oil circuit connecting the A port 18 and the B port 19 of the oil control valve 20 to be closed simultaneously, so that the oil pressures in the A chamber 22 and the B chamber 23 inside the hydraulic angle regulator 1 are equal, and the inner ring rotor 16 of the bearing is stabilized at the target angle position.

[0041] The yaw / pitch system of the wind turbine of the present invention can be adjusted and switched among three states: clockwise adjustment state, counterclockwise adjustment state, and stable state through structural settings to meet the requirements of different working states. When the yaw / pitch system of the wind turbine is in the clockwise adjustment state, when the wind direction / wind speed changes, the PLC calculates the nacelle deflection angle based on the current wind direction / calculates the blade deflection angle based on the current wind speed, and converts it into a duty cycle signal and sends it to the oil control valve to control the opening and closing of the oil circuit connected to the A interface and the B interface, so that the P interface is connected to the A interface and the T interface is connected to the B interface. The A chamber in the hydraulic angle adjuster is filled with oil, and the B chamber discharges oil, causing the inner ring rotor of the bearing in the hydraulic angle adjuster to rotate, thereby driving the nacelle / blade to rotate. The angle encoder feeds back the nacelle / blade angle to the PLC until the target angle is reached. When the yaw / pitch system of the wind turbine is in the counterclockwise adjustment state, when the wind direction / wind speed changes, the PLC calculates the nacelle deflection angle based on the current wind direction / calculates the blade deflection angle based on the current wind speed, and converts it into a duty cycle signal and sends it to the oil control valve to control the opening and closing of the oil circuit connected to the A interface and the B interface, so that the P interface is connected to the B interface and the T interface is connected to the A interface. The B chamber in the hydraulic angle adjuster is filled with oil, and the A chamber discharges oil, causing the inner ring rotor of the bearing in the hydraulic angle adjuster to rotate, driving the nacelle / blade to rotate. The angle encoder feeds back the nacelle / blade angle to the PLC until the target angle is reached. When the yaw / pitch system of the wind turbine is in the stable state, when the wind direction / wind speed remains stable, the PLC controls the oil circuits connected to the A interface and the B interface of the oil control valve to be closed simultaneously, so that the oil pressures in the A chamber and the B chamber inside the hydraulic angle adjuster are equal, and the inner ring rotor of the bearing is stabilized at the target angle position. The system of the present invention simplifies the structure of the yaw system / pitch system through the integrated structure of the hydraulic angle adjuster and the yaw bearing / pitch bearing, with high precision, high reliability, and low cost. Connecting an accumulator in series at the rear end of the oil pump can reduce the working time of the oil pump and lower the energy consumption.

[0042] The present invention has been described exemplarily in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above-mentioned manner. As long as various improvements are made by adopting the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A yaw / pitch system for a wind turbine, characterized in that: It includes a hydraulic angle adjuster (1). The hydraulic angle adjuster (1) includes an outer bearing ring (17). An inner bearing ring rotor (16) and a stator (15) are arranged inside the outer bearing ring (17). The stator (15) is connected to the tower / hub, and the inner bearing ring rotor (16) is connected to the nacelle / blade. The stator (15) divides the inside of the inner bearing ring rotor (16) into two oil chambers. Two oil circuits are led out from the two oil chambers by a cover plate (13) or two oil circuits are led out from the rod part of the stator (15). Each oil circuit is externally connected to a pressure sensor respectively. One oil circuit is connected to the A interface (18) of an oil control valve (21), and the other oil circuit is connected to the B interface (19) of the oil control valve (21). The P interface (20) of the oil control valve (21) is connected to an accumulator (8), an oil pump (10), and then connected to a fuel tank (11). A pressure sensor is connected in series between the accumulator (8) and the oil control valve (21). The T interface (22) of the oil control valve (21) is directly connected to the fuel tank (11). The pressure sensor and the angle encoder (2) are respectively connected to a controller (4). The yaw / pitch system of the wind turbine is set to a structure that can be adjusted and switched among three states: clockwise adjustment state, counterclockwise adjustment state, and stable state. When the yaw / pitch system of the wind turbine is in the clockwise adjustment state, when the wind direction / wind speed changes, the PLC (4) calculates the nacelle deflection angle according to the current wind direction / calculates the blade deflection angle according to the current wind speed, and converts it into a duty cycle signal and sends it to the oil control valve (21) to control the opening and closing of the oil circuits connected to the A interface (18) and the B interface (19), so that the P interface (20) is connected to the A interface (18), and the T interface (24) is connected to the B interface (19). The A chamber (22) in the hydraulic angle adjuster (1) is filled with oil, and the B chamber (23) discharges oil, so that the inner bearing ring rotor (16) in the hydraulic angle adjuster (1) rotates, thereby driving the nacelle / blade to rotate. The angle encoder (2) feeds back the nacelle / blade angle to the PLC until the target angle is adjusted.

2. The yaw / pitch system of a wind turbine according to claim 1, characterized in that: The controller (4) of the yaw / pitch system of the wind turbine is set to a structure that can receive the electrical signals of each pressure sensor and the angle encoder (2), and transmit a PWM signal to the oil control valve (21) according to the received electrical signals and control the start and stop of the oil pump (10).

3. The yaw / pitch system of a wind turbine according to claim 1 or 2, characterized in that: An accumulator (8) is connected in series between the oil pump (10) and the oil control valve (21). The stator (15) divides the inner bearing ring rotor (16) into two oil chambers, namely the A chamber (22) and the B chamber (23), and a three-position four-way oil control valve is used to control the opening and closing of the two oil circuits.

4. The yaw / pitch system of a wind turbine according to claim 1 or 2, characterized in that: When the yaw / pitch system of the wind turbine unit is adjusted counterclockwise and the wind direction / wind speed changes, the PLC (4) calculates the nacelle deflection angle based on the current wind direction / calculates the blade deflection angle based on the current wind speed, and converts it into a duty cycle signal and sends it to the oil control valve (21) to control the opening and closing of the oil circuit connecting the A port (18) and the B port (19), so that the P port (20) is connected to the B port (19), and the T port (24) is connected to the A port (18). The B chamber (23) in the hydraulic angle regulator (1) is filled with oil, and the A chamber (22) discharges oil, causing the inner ring rotor (16) of the bearing in the hydraulic angle regulator (1) to rotate, thereby driving the nacelle / blade to rotate. The angle encoder (2) feeds back the nacelle / blade angle to the PLC until the target angle is reached.

5. The yaw / pitch system of a wind turbine according to claim 1 or 2, characterized in that: When the yaw / pitch system of the wind turbine unit is in a stable state and the wind direction / wind speed remains stable, the PLC controls the oil control valve (20) to simultaneously close the oil circuits connecting the A port (18) and the B port (19), so that the oil pressures in the A chamber (22) and the B chamber (23) inside the hydraulic angle regulator (1) are equal, and the inner ring rotor (16) of the bearing is stabilized at the target angle position.

6. The control method of the yaw / pitch system of a wind turbine according to any one of claims 1 to 5, characterized in that: The control steps of the control method of the yaw / pitch system of the wind turbine unit include a clockwise adjustment state, a counterclockwise adjustment state, and a stable state; When the yaw / pitch system of the wind turbine unit is in the clockwise adjustment state and the wind direction / wind speed changes, the PLC (4) calculates the nacelle deflection angle based on the current wind direction / calculates the blade deflection angle based on the current wind speed, and converts it into a duty cycle signal and sends it to the oil control valve (21) to control the opening and closing of the oil circuit connecting the A port (18) and the B port (19), so that the P port (20) is connected to the A port (18), and the T port (24) is connected to the B port (19). The A chamber (22) in the hydraulic angle regulator (1) is filled with oil, and the B chamber (23) discharges oil, causing the inner ring rotor (16) of the bearing in the hydraulic angle regulator (1) to rotate, thereby driving the nacelle / blade to rotate. The angle encoder (2) feeds back the nacelle / blade angle to the PLC until the target angle is reached.

7. The control method for the yaw / pitch system of a wind turbine according to claim 6, characterized in that: When the yaw / pitch system of the wind turbine unit is adjusted counterclockwise and the wind direction / wind speed changes, the PLC (4) calculates the nacelle deflection angle based on the current wind direction / calculates the blade deflection angle based on the current wind speed, and converts it into a duty cycle signal and sends it to the oil control valve (21) to control the opening and closing of the oil circuit connecting the A port (18) and the B port (19), so that the P port (20) is connected to the B port (19), and the T port (24) is connected to the A port (18). The B chamber (23) in the hydraulic angle regulator (1) is filled with oil, and the A chamber (22) discharges oil, causing the inner ring rotor (16) of the bearing in the hydraulic angle regulator (1) to rotate, thereby driving the nacelle / blade to rotate. The angle encoder (2) feeds back the nacelle / blade angle to the PLC until the target angle is reached.

8. The control method for the yaw / pitch system of a wind turbine according to claim 6, characterized in that: When the yaw / pitch system of the wind turbine is in a stable state, when the wind direction / wind speed remains stable and unchanged, the PLC controls the oil circuits connected to the A interface (18) and B interface (19) of the oil control valve (20) to be closed simultaneously, so that the oil pressures in the A chamber (22) and B chamber (23) inside the hydraulic angle regulator (1) are equal, and the inner ring rotor (16) of the bearing is stabilized at the target angle position.

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