A fully automatic control forced yaw system for preventing runaway of wind turbine generator set

Abstract

A fully automatic controlled forced yaw system for preventing runaway of a wind turbine generator set comprises: a wheel hub speed measuring device, a forced yaw system controller, a wind direction monitoring device and a signal judgment module, wherein the wind direction monitoring device outputs a wind direction monitoring signal to the signal judgment module, and then the signal judgment module outputs a cabin left deviation signal or a cabin right deviation signal to the forced yaw system controller; the forced yaw system controller has a first signal output terminal to a fourth signal output terminal, and outputs the following four signals respectively: a normal system operation feedback signal is input to a digital quantity feedback point of an original wind turbine generator set control system; a yaw system brake of the unit is opened or a yaw frequency converter is manually triggered and input to the original wind turbine generator set yaw system; a left yaw signal is input to the yaw system of the wind turbine generator set to control the cabin to yaw to the left; and a right yaw signal is input to the yaw system of the wind turbine generator set to control the cabin to yaw to the right.

Description

Technical Field

[0001] The invention relates to the field of wind power generation, and in particular to a full-automatic control forced yaw system for preventing runaway of a wind power generator set. Background Art

[0002] At present, the main measure for wind turbines to prevent hub runaway is to activate the pneumatic brake system to return the hub blades to the reference position. When the hub speed of the wind turbine exceeds the normal limit, the main control system or the safety chain system sends a return command to the pitch control system to quickly return the blades to the reference position, reduce the windward surface area of ​​the blades, reduce wind energy absorption, and reduce the hub speed of the wind turbine to ensure the safety of the wind turbine equipment. In order to ensure that the pneumatic brake system can still be activated in the event of hub power failure, wind turbines are equipped with a backup power supply specifically for emergency power supply of the pitch system.

[0003] However, if the wind turbine hub overspeeds, the blades always maintain a large wind energy absorption area and cannot return to the propeller normally, or the backup power supply for the variable pitch system is damaged when the hub loses power, there will still be a risk of the wind turbine running away. When a wind turbine is seriously overspeeding, if the hub speed is not reduced in time, it will cause the unit to collapse and cause devastating losses.

[0004] The fundamental reason for the risk of wind turbine runaway is that under abnormal conditions, the hub blades still maintain a large area for absorbing wind energy. When the hub blades cannot return to the propellers normally, yaw the wind turbine nacelle to an angle of about 90° with the wind, which can also significantly reduce the area of ​​wind energy absorbed by the blades and prevent extreme situations such as runaway and tower collapse. However, when the wind turbine control system fails or the main PLC electrical circuit of the unit fails, the nacelle cannot be controlled normally for yaw action, and extreme situations cannot be avoided. Summary of the invention

[0005] The present invention provides a fully automatic control forced yaw system for preventing runaway of a wind turbine generator set, which is used to solve the problems existing in the above-mentioned prior art.

[0006] To achieve the above object, the present invention provides a fully automatic control forced yaw system for preventing overrunning of a wind turbine generator set, which comprises: a wheel hub speed measuring device, a forced yaw system controller, a wind direction monitoring device and a signal judgment module, wherein:

[0007] The wheel hub speed measuring device is used to determine whether the wheel hub is in a serious overspeed state, and it outputs a speed measurement signal to the forced yaw system controller;

[0008] The wind direction monitoring device outputs a wind direction monitoring signal to the signal judgment module, and then the signal judgment module outputs a cabin left deviation signal or a cabin right deviation signal to the forced yaw system controller;

[0009] The forced yaw system controller has a first signal output terminal, a second signal output terminal, a third signal output terminal and a fourth signal output terminal, which respectively output the following four signals (1) to (4):

[0010] (1) Feedback signal of normal system operation,

[0011] (2) The yaw system brake of the unit is opened or the yaw inverter is manually triggered.

[0012] (3) Left yaw signal,

[0013] (4) Right yaw signal,

[0014] The normal operation feedback signal of the system is input to the digital feedback point of the original wind turbine control system to determine whether the forced yaw system is operating normally;

[0015] The yaw system brake of the unit is opened or the manual trigger signal of the yaw inverter is input into the yaw system of the original wind turbine generator set as a preparation signal for forced yaw, so that the nacelle can perform yaw action normally;

[0016] The left yaw signal is input to the yaw system of the wind turbine generator set to control the nacelle to perform a left yaw action;

[0017] The right yaw signal is input to the yaw system of the wind turbine generator set to control the nacelle to perform a right yaw action.

[0018] In one embodiment of the present invention, the wind turbine anti-runaway fully automatic control forced yaw system also includes a remote control yaw system, which is manually controlled and can output to the forced yaw system controller a signal to open the yaw system brake of the unit or a manual trigger signal of the yaw inverter, a left yaw signal or a right yaw signal.

[0019] In one embodiment of the present invention, the wheel hub speed measuring device has a proximity switch, and the real-time pulse signal output by the proximity switch is input into the forced yaw system controller.

[0020] In one embodiment of the present invention, the wind direction monitoring device comprises a wind vane and a signal conversion module. The signal conversion module receives the signal output by the wind vane and converts it into a wind direction monitoring signal in digital form.

[0021] In one embodiment of the present invention, when the angle between the cabin and the wind is less than 70° or greater than 110°, the signal conversion module outputs a yaw signal to the forced yaw system controller. The forced yaw system controller determines the direction of yaw required to maintain the angle between the cabin and the wind at 90° based on the yaw signal and yaws in this direction for a time T, which is determined by the time required for the cabin to yaw 20°.

[0022] In one embodiment of the present invention, the forced yaw system controller stops outputting the yaw signal after receiving a system reset signal feedback or the system is powered off. When the real-time pulse signal output by the proximity switch received by the forced yaw system controller exceeds the normal limit, the forced yaw system controller starts working again.

[0023] In one embodiment of the present invention, the wind turbine anti-runaway fully automatic control forced yaw system also includes a switching power supply and an air switch, the switching power supply is a 24V VDC power supply device, the forced yaw system is powered by 230V AC, and the air switch is used to protect the 230V AC power supply line.

[0024] In one embodiment of the present invention, the forced yaw system is located inside a control box, and a temperature control switch and a heater are provided inside the control box.

[0025] When the temperature inside the control box is lower than 8°C, the contacts of the temperature control switch are normally closed and the heater starts to operate;

[0026] When the temperature inside the control box is higher than 8°C, the contacts of the temperature control switch are switched to the normally open state and the heater stops running.

[0027] The wind turbine anti-runaway fully automatic control forced yaw system provided by the present invention is independent of the original wind turbine control system, and can force the wind turbine nacelle to yaw to a safe angle and maintain a certain safe angle after the wind turbine hub speed exceeds the normal limit. The present invention can force the nacelle to yaw to about 90° with the wind angle after a certain period of time when the wind turbine hub runs away, and continue to keep the nacelle at a certain safe angle. When relevant staff members determine that the wind turbine is in a situation where there is a risk of runaway, they can also remotely and manually start the system to force the nacelle to yaw to the left or right, and the forced yaw system can be manually stopped at any time during the operation; if no staff member stops the forced yaw system after the remote manual start, the forced yaw system will remain in operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A circuit diagram of the air switch and the switch power supply in the wind turbine anti-runaway fully automatic control forced yaw system provided by the present invention;

[0030] Figure 2 A circuit diagram of the periphery of a forced yaw system controller in the full-automatic forced yaw system for preventing runaway of a wind turbine generator set provided by the present invention;

[0031] Figure 3 A circuit diagram of the wind direction monitoring device and its surroundings in the wind turbine generator set anti-runaway fully automatic control forced yaw system provided by the present invention;

[0032] Figure 4 A circuit diagram of a temperature control switch, a heater and a wheel hub speed measuring device in the wind turbine anti-runaway fully automatic control forced yaw system provided by the present invention;

[0033] Figure 5 A circuit diagram of a remote-controlled yaw system of the present invention;

[0034] Figure 6 A detailed flow chart of yaw control for the present invention;

[0035] Figure 7 A flow chart for remote operation control of the present invention;

[0036] Figure 8 A schematic diagram of the architecture of the fully automatic control forced yaw system for preventing runaway of a wind turbine generator set provided by the present invention.

[0037] Description of reference numerals:

[0038] 1-wheel speed measuring device; 2-forced yaw system controller; 3-wind direction monitoring device; 4-signal judgment module. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] The components in the drawings of this case are described as follows:

[0041] Device number naming principles:

[0042] The first letter indicates the device type (A for control-related devices, F for protection devices, B for sensor devices, T for power supplies, and E for ventilation and heating devices), the second digit is the page number of the drawing where the device is located, and the last digit is the column of the drawing where the device is located. For example, F1.2 is the protection component (air switch) in the second column of the first page of the drawing.

[0043] F1.2 (air switch): protects the system input 230VAC power supply line;

[0044] T1.4 (switching power supply): 24VDC power supply device;

[0045] A2.6 (forced yaw system controller): logic control unit;

[0046] B3.1 (wind vane): a device for real-time monitoring of wind direction;

[0047] F3.4, F3.4.1, F4.6 (surge protector): suppress peak current or voltage;

[0048] A3.6 (Signal conversion module): module for converting analog signals into digital signals;

[0049] B5.3 (temperature control switch): control the heater;

[0050] E3.4 (heater): control box heating device;

[0051] B4.6 (Proximity switch): Wind turbine hub speed monitoring device;

[0052] A5.3 (remote controller): remote manual start and stop system module.

[0053] Figure 1 The circuit diagram of the air switch and the switch power supply in the wind turbine anti-runaway full-automatic control forced yaw system provided by the present invention, Figure 2 A circuit diagram of the periphery of the forced yaw system controller in the wind turbine generator set anti-runaway fully automatic control forced yaw system provided by the present invention, Figure 3 A circuit diagram of the wind direction monitoring device and its surroundings in the wind turbine generator set anti-runaway fully automatic control forced yaw system provided by the present invention, Figure 4 The circuit diagram of the temperature control switch and the heater periphery in the wind turbine anti-runaway fully automatic control forced yaw system provided by the present invention, Figure 5 This is a circuit diagram of the remote control yaw system of the present invention. Figure 6The detailed flow chart of yaw control of the present invention is as follows: Figure 7 This is a flow chart of remote operation control of the present invention, Figure 8 This is a schematic diagram of the architecture of the wind turbine generator set anti-runaway fully automatic control forced yaw system provided by the present invention. Figure 1-Figure 8 As shown, the present invention provides a fully automatic control forced yaw system for preventing overrunning of a wind turbine generator set, which comprises: a wheel hub speed measuring device 1, a forced yaw system controller 2, a wind direction monitoring device 3 and a signal judgment module 4, wherein:

[0054] The wheel hub speed measuring device 1 is used to determine whether the wheel hub is in a serious overspeed state, and it outputs a speed measurement signal to the forced yaw system controller 2 to determine whether the wheel hub is in a serious overspeed state;

[0055] The wind direction monitoring device 3 outputs a wind direction monitoring signal to the signal judgment module 4, and then the signal judgment module 4 outputs a cabin left deviation signal or a cabin right deviation signal to the forced yaw system controller 2. The purpose of adding the wind direction monitoring signal is to avoid the situation where the area of ​​wind energy absorbed by the blade increases and the overspeed situation worsens due to the wrong yaw direction judgment when the forced yaw system needs to work;

[0056] The forced yaw system controller 2 has a first signal output terminal, a second signal output terminal, a third signal output terminal and a fourth signal output terminal, which respectively output the following four signals (1) to (4):

[0057] (1) Feedback signal of normal system operation,

[0058] (2) The yaw system brake of the unit is opened or the yaw inverter is manually triggered.

[0059] (3) Left yaw signal,

[0060] (4) Right yaw signal,

[0061] The normal operation feedback signal of the system is input to the digital feedback point of the original wind turbine control system to determine whether the forced yaw system is operating normally. The normal operation feedback signal of the system is the digital output 03 port signal of A2.6 (forced yaw system controller). When the wind turbine anti-runaway full-automatic control forced yaw system is operating normally, the port outputs a high level (24VDC). When an error occurs in the system, the port outputs a low level (0VDC);

[0062] The yaw system brake of the unit is opened or the manual trigger signal of the yaw inverter is input into the yaw system of the original wind turbine generator set as a preparation signal for forced yaw, so that the nacelle can perform yaw action normally;

[0063] The left yaw signal is input to the yaw system of the wind turbine generator set to control the nacelle to perform a left yaw action;

[0064] The right yaw signal is input to the yaw system of the wind turbine generator set to control the nacelle to perform a right yaw action.

[0065] like Figure 5 As shown, the wind turbine anti-runaway fully automatic control forced yaw system also includes a remote control yaw system. The core of the remote control yaw system is the remote controller. The remote control yaw system is manually controlled and is not affected by the hub speed signal and the wind direction signal. The remote control yaw system can output the unit yaw system brake opening or yaw inverter manual trigger signal, left yaw signal or right yaw signal to the forced yaw system controller, thereby controlling the forced yaw system controller to execute the corresponding yaw action output. The remote control yaw system outputs the above signals to the forced yaw system controller, for example, which can be executed by the corresponding supporting program on a mobile phone or computer.

[0066] like Figure 4 As shown, the wheel hub speed measuring device has a proximity switch, and the real-time pulse signal output by the proximity switch is input into the forced yaw system controller.

[0067] like Figure 3 As shown, the wind direction monitoring device has a wind vane and a signal conversion module. The signal conversion module receives the signal output by the wind vane and converts it into a wind direction monitoring signal in digital form.

[0068] In this embodiment, when the angle between the cabin and the wind is less than 70° or greater than 110°, the signal conversion module outputs a yaw signal to the forced yaw system controller. The forced yaw system controller determines the direction of yaw required to maintain the angle between the cabin and the wind at 90° based on the yaw signal and yaws in this direction for a time T, which is determined by the time required for the cabin to yaw 20°.

[0069] In this embodiment, the forced yaw system controller stops outputting yaw signals after receiving system reset signal feedback or system power failure. When the real-time pulse signal output by the proximity switch received by the forced yaw system controller exceeds the normal limit, the forced yaw system controller starts working again.

[0070] like Figure 1 As shown, in this embodiment, the wind turbine anti-runaway fully automatic control forced yaw system also includes a switching power supply and an air switch, the switching power supply is a 24V VDC power supply device, the forced yaw system is powered by 230V AC, and the air switch is used to protect the 230V AC power supply line.

[0071] like Figure 4As shown, in this embodiment, the forced yaw system is located inside a control box, and a temperature control switch and a heater are provided inside the control box.

[0072] When the temperature inside the control box is lower than 8°C, the contacts of the temperature control switch are normally closed and the heater starts to operate;

[0073] When the temperature inside the control box is higher than 8°C, the contacts of the temperature control switch are switched to the normally open state and the heater stops running.

[0074] When the present invention is working, the automatic control forced yaw system receives the pulse signal fed back in real time by B4.6 (proximity switch) through A2.6 (forced yaw system controller) to monitor the hub speed of the wind turbine; A2.6 (forced yaw system controller) simultaneously receives the digital signal converted by A3.6 (signal conversion module) from B3.1 (wind vane) to determine the angle between the cabin and the wind. When the hub speed received by A2.6 (forced yaw system controller) exceeds the normal value, and the pneumatic brake or other emergency measures fail to reduce the hub speed after a certain period of time, A2.6 (forced yaw system controller) determines the angle between the cabin and the wind in combination with the feedback information of A3.6 (signal conversion module), determines the direction of forced yaw by increasing the angle between the cabin and the wind, and outputs the yaw system brake opening or yaw inverter manual trigger signal and the corresponding left or right yaw signal. A2.6 (forced yaw system controller) outputs signals for a certain period of time before stopping. The duration is determined by the yaw speed of the wind turbine generator set to ensure that the angle between the nacelle and the wind is about 90° after the yaw stops.

[0075] If there is no system reset signal feedback after the automatic control forced yaw system is started, the pulse signal feedback from B4.6 (proximity switch) will be ignored, and the angle between the cabin and the wind will be continuously monitored through the digital signal converted by B3.1 (wind vane) through A3.6 (signal conversion module).

[0076] The wind turbine anti-runaway fully automatic control forced yaw system provided by the present invention is independent of the original wind turbine control system, and can force the wind turbine nacelle to yaw to a safe angle and maintain a certain safe angle after the wind turbine hub speed exceeds the normal limit. The present invention can force the nacelle to yaw to about 90° with the wind angle after a certain period of time when the wind turbine hub runs away, and continue to keep the nacelle at a certain safe angle. When relevant staff members determine that the wind turbine is in a situation where there is a risk of runaway, they can also remotely and manually start the system to force the nacelle to yaw to the left or right, and the forced yaw system can be manually stopped at any time during the operation; if no staff member stops the forced yaw system after the remote manual start, the forced yaw system will remain in operation.

[0077] Those skilled in the art can understand that the accompanying drawings are only schematic diagrams of an embodiment, and the modules or processes in the accompanying drawings are not necessarily required to implement the present invention.

[0078] Those skilled in the art can understand that the modules in the device in the embodiment can be distributed in the device in the embodiment according to the description of the embodiment, or can be changed accordingly and located in one or more devices different from the embodiment. The modules in the above embodiment can be combined into one module, or can be further divided into multiple sub-modules.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fully automatic control forced yaw system for preventing overrunning of wind turbine generator set, characterized in that: include: Wheel speed measuring equipment, forced yaw system controller, wind direction monitoring equipment, signal judgment module and remote control yaw system, including: The wheel hub speed measuring device is used to determine whether the wheel hub is in a serious overspeed state, and it outputs a speed measurement signal to the forced yaw system controller; The wind direction monitoring device outputs a wind direction monitoring signal to the signal judgment module, and then the signal judgment module outputs a cabin left deviation signal or a cabin right deviation signal to the forced yaw system controller; The forced yaw system controller has a first signal output terminal, a second signal output terminal, a third signal output terminal and a fourth signal output terminal, which respectively output the following four signals (1) to (4): (1) Feedback signal of normal system operation, (2) The yaw system brake of the unit is opened or the yaw inverter is manually triggered. (3) Left yaw signal, (4) Right yaw signal, The normal operation feedback signal of the system is input to the digital feedback point of the original wind turbine control system to determine whether the forced yaw system is operating normally; The yaw system brake of the unit is opened or the manual trigger signal of the yaw inverter is input into the yaw system of the original wind turbine generator set as a preparation signal for forced yaw, so that the nacelle can perform yaw action normally; The left yaw signal is input to the yaw system of the wind turbine generator set to control the nacelle to perform a left yaw action; The right yaw signal is input to the yaw system of the wind turbine to control the nacelle to yaw to the right. The remote control yaw system is manually controlled. The remote control yaw system can output the unit yaw system brake opening or yaw inverter manual trigger signal, left yaw signal or right yaw signal to the forced yaw system controller. The wheel hub speed measuring device has a proximity switch, and the real-time pulse signal output by the proximity switch is input into the forced yaw system controller.

2. The wind turbine generator set anti-runaway fully automatic control forced yaw system according to claim 1 is characterized in that: The wind direction monitoring device comprises a wind vane and a signal conversion module. The signal conversion module receives the signal output by the wind vane and converts it into a wind direction monitoring signal in digital form.

3. The wind turbine generator set anti-runaway fully automatic control forced yaw system according to claim 1 is characterized in that: When the angle between the cabin and the wind is less than 70° or greater than 110°, the signal conversion module outputs a yaw signal to the forced yaw system controller. The forced yaw system controller determines the yaw direction required to maintain the angle between the cabin and the wind at 90° based on the yaw signal and yaws in this direction for a time T, which is determined by the time required for the cabin to yaw 20°.

4. The wind turbine generator set anti-runaway fully automatic control forced yaw system according to claim 1 is characterized in that: The forced yaw system controller stops outputting yaw signals when it receives system reset signal feedback or the system is powered off. When the real-time pulse signal output by the proximity switch received by the forced yaw system controller exceeds the normal limit, the forced yaw system controller starts working again.

5. The wind turbine generator set anti-runaway fully automatic control forced yaw system according to claim 1 is characterized in that: It also includes a switching power supply and an air switch. The switching power supply is a 24V VDC power supply device. The forced yaw system is powered by 230V AC. The air switch is used to protect the 230V AC power supply line.

6. The wind turbine generator set anti-runaway fully automatic control forced yaw system according to claim 1, characterized in that: The forced yaw system is located inside a control box, which is equipped with a temperature control switch and a heater. When the temperature inside the control box is lower than 8°C, the contacts of the temperature control switch are normally closed and the heater starts to operate; When the temperature inside the control box is higher than 8°C, the contacts of the temperature control switch are switched to the normally open state and the heater stops running.

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