WO2022088376A1

WO2022088376A1 - Automatic emergency yaw control system and method for preventing runaway of wind generator set

Info

Publication number: WO2022088376A1
Application number: PCT/CN2020/133522
Authority: WO
Inventors: 王向伟; 丁春兴; 张时; 段瑞龙; 刘毅
Original assignee: 华能新能源股份有限公司河北分公司
Priority date: 2020-10-28
Filing date: 2020-12-03
Publication date: 2022-05-05
Also published as: CN112145350B; CN112145350A

Abstract

Disclosed in the present invention are an automatic emergency yaw control system and method for preventing runaway of a wind generator set. The system comprises an emergency yaw control circuit; the input end of the emergency yaw control circuit is connected to an impeller rotation speed measurement device of the wind generator set, and the output end of the emergency yaw control circuit is separately connected to a yaw driving circuit and a yaw braking circuit; and the emergency yaw control circuit is used for starting the power supply of the yaw braking circuit when the rotation speed of the impeller of the wind generator set exceeds a rated rotation speed, and after delaying for a preset period of time, starting the power supply of the yaw driving circuit. The method and system of the present invention can perform yaw control when the rotation speed of the impeller of the wind generator set exceeds a speed, so that the impeller of the wind generator set deviates from a main wind direction, thereby achieving the purpose of reducing the rotation speed.

Description

Automatic emergency yaw control system and method for preventing flying car for wind turbines

This application claims the priority of the Chinese patent application filed on October 28, 2020 with the application number 202011169508.6 and the invention titled "A Wind Turbine Turbine Automatic Emergency Yaw Control System and Method", all of which are The contents are incorporated herein by reference.

technical field

The invention relates to the technical field of wind turbine braking, in particular to a wind turbine automatic emergency yaw control system and method for preventing flying cars.

Background technique

There are various reasons for wind turbine speeding accidents, such as the failure of the pitch control system, the sudden loss of power in the power grid, the failure of the backup power supply, the daily maintenance and improper management and other factors can affect the safe operation of the unit to a certain extent. The so-called flying car is the failure of the braking system of the wind turbine, the speed of the wind turbine exceeds the allowable or rated speed, and the unit is out of control. If the speed of the unit is not effectively controlled, the wind turbine will suffer devastating blows such as blade breakage and tower collapse, which will cause huge economic losses and even endanger personal safety.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an automatic emergency yaw control system and method for preventing flying cars of a wind turbine, which can perform yaw control when the speed of the impeller of the wind turbine is overspeed, so that the impeller of the turbine deviates from the main wind direction, thereby achieving the purpose of reducing the speed.

For achieving the above object, the present invention provides the following scheme:

An automatic emergency yaw control system for preventing flying cars for wind turbines, comprising:

Emergency yaw control circuit;

The input end of the emergency yaw control circuit is connected to the wind turbine impeller speed detection device, and the output end of the emergency yaw control circuit is respectively connected to the yaw driving circuit and the yaw braking circuit; the emergency yaw control circuit The circuit is used to turn on the power supply of the yaw braking circuit when the rotational speed of the wind turbine impeller exceeds the rated rotational speed, and turn on the power supply of the yaw driving circuit after a delay of a preset time.

Optionally, also include:

additional power supply;

The additional power source is connected to the yaw motor; the additional power source is used to provide electrical energy to the yaw motor when the yaw power source is vectored; the yaw power source is used to provide electrical energy to the yaw motor.

Optionally, the emergency yaw control circuit specifically includes:

Speed relay, first power-on delay relay, second power-on delay relay, power-off delay relay and power-on non-delay relay;

The rotational speed relay is connected to the wind turbine impeller rotational speed detection device, and the rotational speed relay is used to close the first contact of the rotational speed relay when the rotational speed of the wind turbine impeller exceeds the rated rotational speed, and when the rotational speed of the wind turbine impeller is less than the Turning on the second contact of the rotational speed relay at rated rotational speed; the first contact of the rotational speed relay is a normally open contact, and the second contact of the rotational speed relay is a normally closed contact;

The first end of the contact of the first power-on delay relay, the first end of the first contact of the power-on non-delay relay, and the first end of the second contact of the power-on non-delay relay are all connected with high level;

The second end of the contact of the first power-on delay relay, the second end of the first contact of the power-on non-delay relay, the first end of the power-on non-delay relay, and the power-off delay relay. When the first terminals of the relay are connected together;

The first end of the first power-on delay relay is connected to the speed relay, the first end of the second contact of the speed relay is connected to the second end of the power-on non-delay relay, and the power-on non-delay relay is connected. The second end of the second contact of the delay relay is connected to the first end of the contact of the power-off delay relay, and the second end of the contact of the power-off delay relay is respectively energized with the second The first end of the delay relay is connected to the yaw braking circuit;

The second end of the first power-on delay relay, the second end of the second contact of the speed relay, the second end of the power-off delay relay, and the second power-on delay relay. Both terminals are connected to low level;

The first end of the contact of the second power-on delay relay is connected to the first end of the second power-on delay relay, and the second end of the contact of the second power-on delay relay is connected to the yaw drive circuit connection.

Optionally, the system further includes:

Power relay and power detection circuit;

The power relay is connected to the total power supply of the wind turbine;

The power detection circuit is used to switch the wiring mode of the yaw motor when the rotational speed of the impeller of the wind turbine exceeds the rated rotational speed and the yaw power supply vector power.

Optionally, the power detection circuit specifically includes:

Yaw motor first relay, yaw motor second relay, yaw drive relay, yaw electromagnetic relay, hydraulic pump relay and clockwise yaw relay;

The first end of the normally closed contact of the power supply relay is connected to the high level, the second end of the normally closed contact of the power supply relay is connected to the first end of the normally open contact of the rotational speed relay, and the The second end of the normally open contact of the speed relay is connected to the first end of the second power-on delay relay, and the second end of the second power-on delay relay is connected to the normally closed second relay of the yaw motor. The first end of the contact is connected, the second end of the normally closed contact of the second relay of the yaw motor is connected to the first end of the first relay of the yaw motor, and the first end of the first relay of the yaw motor is connected. The two terminals are connected to low level;

The first end of the normally open contact of the power relay is connected to the high level, the first end of the normally closed contact of the speed relay is connected to the high level, and the second end of the normally open contact of the power relay is connected to the high level. The terminal and the second terminal of the normally closed contact of the speed relay are both connected to the first terminal of the normally closed contact of the first relay of the yaw motor, and the normally closed contact of the first relay of the yaw motor The second end is connected to the first end of the second relay of the yaw motor, and the second end of the second relay of the yaw motor is connected to the low level;

The first end of the yaw drive relay, the first end of the yaw electromagnetic relay, the first end of the hydraulic pump relay and the first end of the clockwise yaw relay are all energized with the second The second end of the delay relay is connected, the second end of the yaw drive relay, the second end of the yaw electromagnetic relay, the second end of the hydraulic pump relay and the first end of the clockwise yaw relay. Both ends are connected to low level.

Optionally, the system further includes:

a first diode, a second diode and a third diode;

The conducting end of the first diode is connected to the high-level end of the yaw driving circuit, and the cut-off end of the first diode is connected to the second end of the contact of the second power-on delay relay connect;

The conducting end of the second diode is connected to the second end of the contact of the power-off delay relay, and the conducting end of the third diode is connected to the high voltage of the yaw braking circuit. The flat end is connected, and the cut-off end of the second diode is connected with the cut-off end of the third diode.

optional,

The delay time of the first power-on delay relay is 2s;

The delay time of the power-off delay relay is 1-2s;

The delay time of the second power-on delay relay is determined according to the time taken to yaw by 90 degrees.

optional,

The voltage of the high level is 24V;

The voltage of the low level is 0V;

The voltage of the additional power supply is 400V.

The present invention also provides an automatic emergency yaw control method for preventing flying cars of a wind turbine, which is applied to the above-mentioned automatic emergency yaw control system for preventing flying cars for wind turbines. The method includes:

Get the wind turbine impeller speed;

Determine whether the wind turbine impeller speed is greater than the rated speed; if it is greater than the rated speed, turn on the power of the yaw braking circuit, and turn on the power of the yaw drive circuit after a preset time delay.

Optionally, after the power supply of the yaw braking circuit is turned on, and the power supply of the yaw drive circuit is turned on after delaying a preset time, it also includes:

Determine whether there is a yaw power supply; if there is a yaw power supply, start the yaw motor; if there is no yaw power supply, connect the yaw motor to an additional power supply, and then start the yaw motor.

Optionally, after starting the yaw motor, the method further includes:

When the rotational speed of the impeller of the wind generator set is less than the preset safe rotational speed, the second contact of the rotational speed relay in the emergency yaw control circuit is opened.

According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

The invention proposes an automatic emergency yaw control system and method for preventing flying cars of a wind generator set. By setting an emergency yaw control circuit, the input end of the emergency yaw control circuit is connected with a wind generator set impeller speed detection device. The output terminals of the control circuit are respectively connected with the yaw drive circuit and the yaw braking circuit; the emergency yaw control circuit is used to turn on the power of the yaw braking circuit when the speed of the wind turbine impeller exceeds the rated speed, and it will be activated after the delay time. After setting the time, the power supply of the yaw drive circuit is turned on, and the yaw control can be performed when the speed of the wind turbine impeller is overspeed, so that the turbine impeller deviates from the main wind direction, so as to achieve the purpose of reducing the speed.

In addition, by setting the additional power supply, the yaw motor can be started when there is no yaw power supply, which improves the reliability of the automatic emergency yaw control system for preventing flying cars of the wind turbine.

Instruction drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some of the present invention. In the embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative labor.

1 is a structural diagram of a yaw control system that is not connected to an emergency yaw control circuit in an embodiment of the present invention;

2 is a structural diagram of a yaw control system connected to an emergency yaw control circuit in an embodiment of the present invention;

3 is a structural diagram of an emergency yaw control circuit in an embodiment of the present invention;

4 is a schematic diagram of a yaw motor circuit in an embodiment of the present invention;

5 is a schematic diagram of a 400V connection terminal in an embodiment of the present invention;

6 is a wiring diagram of a control circuit in an embodiment of the present invention;

FIG. 7 is a flowchart of an automatic emergency yaw control method for preventing flying cars of a wind turbine in an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The purpose of the present invention is to provide an automatic emergency yaw control system and method for preventing speeding of wind turbines, which can perform yaw control when the rotational speed of the impeller of the wind turbine exceeds the speed, so that the impeller of the turbine deviates from the main wind direction, thereby achieving the purpose of reducing the rotational speed.

In order to make the objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

Example

FIG. 1 is a structural diagram of a yaw control system not connected to an emergency yaw control circuit in an embodiment of the present invention, FIG. 2 is a structural diagram of a yaw control system connected to an emergency yaw control circuit in an embodiment of the present invention, and FIG. 3 is a A structural diagram of an emergency yaw control circuit in an embodiment of the present invention, and FIG. 4 is a schematic diagram of a yaw motor circuit in an embodiment of the present invention.

As shown in Figure 1-4, an automatic emergency yaw control system for wind turbines to prevent flying cars includes: an emergency yaw control circuit; the input end of the emergency yaw control circuit is connected to the wind turbine impeller speed detection device, the emergency yaw control circuit The output terminals of the yaw control circuit are respectively connected with the yaw drive circuit and the yaw braking circuit; the emergency yaw control circuit is used to turn on the power of the yaw braking circuit when the speed of the wind turbine impeller exceeds the rated speed, and after the delay Turn on the power of the yaw drive circuit after a preset time.

Emergency yaw control circuit, including:

Speed relay, first power-on delay relay KT3, second power-on delay relay KT2, power-off delay relay KT1 and power-on non-delay relay K;

The speed relay is connected with the wind turbine impeller speed detection device, and the speed relay is used to close the first contact KF1 of the speed relay when the wind turbine impeller speed exceeds the rated speed, and open the speed relay when the wind turbine impeller speed is less than the rated speed. The second contact KF2; the first contact of the speed relay is a normally open contact, and the second contact of the speed relay is a normally closed contact.

The first end of the contact KT3 of the first power-on delay relay, the first end of the first contact K of the power-on non-delay relay, and the first end of the second contact K of the power-on non-delay relay are all connected to the high voltage. Flat connection.

The second end of the contact KT3 of the first power-on delay relay, the second end of the first contact K of the power-on non-delay relay, the first end of the power-on non-delay relay K, and the first end of the power-on delay relay KT1. connected together at one end.

The first end of the first power-on delay relay KT3 is connected to the speed relay KF1, the first end of the second contact KF2 of the speed relay is connected to the second end of the power-on non-delay relay K, and the second terminal of the power-on non-delay relay K is connected. The second end of the contact K is connected with the first end of the contact KT1 of the power-off delay relay, and the second end of the contact KT1 of the power-off delay relay is respectively connected with the first end of the second power-on delay relay KT2 and Yaw brake circuit connection.

The second terminal of the first power-on delay relay KT3, the second terminal of the second contact KF2 of the speed relay, the second terminal of the power-off delay relay KT1 and the second terminal of the second power-on delay relay KT2 are all connected to the low level connection.

The first end of the contact KT2 of the second power-on delay relay is connected to the first end of the second power-on delay relay KT2, and the second end of the contact KT2 of the second power-on delay relay is connected to the yaw drive circuit.

As shown in Figure 5-6, the automatic emergency yaw control system for preventing flying cars of wind turbines also includes: power relays (Ka, Kb, Kc) and power detection circuits. The power supply relay is connected with the total power supply of the wind turbine; the power detection circuit is used to switch the wiring mode of the yaw motor when the speed of the impeller of the wind turbine exceeds the rated speed and the yaw power supply is vectored.

Power detection circuit, including:

Yaw motor first relay (KM31, KM32, KM33, KM34), yaw motor second relay (KM41, KM42, KM43, KM44), yaw drive relay KA, yaw electromagnetic relay KB, hydraulic pump relay KC and clockwise Yaw relay KM2.

The first end of the normally closed contact of the power relay (Ka, Kb, Kc on the left of Figure 6) is connected to the high level, and the second end of the normally closed contact of the power relay is connected to the second end of the normally open contact KF1 of the speed relay. One end is connected, the second end of the normally open contact of the speed relay (KF1 on the left in Figure 6) is connected to the first end of the second power-on delay relay KT2, and the second end of the second power-on delay relay KT2 is connected to the yaw The first end of the normally closed contact of the second relay of the motor (KM41, KM42, KM43, KM44 on the left of Figure 6) is connected, and the second end of the normally closed contact of the second relay of the yaw motor is connected to the first relay of the yaw motor The first end of the yaw motor is connected to the second end of the first relay of the yaw motor, and the second end of the first relay is connected to the low level.

The first end of the normally open contact of the power relay (Ka, Kb, Kc on the right side of Figure 6) is connected to the high level, and the first end of the normally closed contact of the speed relay (KF1 on the right side of Figure 6) is connected to the high level. Connect, the second end of the normally open contact of the power relay and the second end of the normally closed contact of the speed relay are both connected to the first end of the normally closed contact (KM31, KM32, KM33, KM34) of the first relay of the yaw motor. The second end of the normally closed contact of the first relay of the yaw motor is connected to the first end of the second relay of the yaw motor (KM41, KM42, KM43, KM44), and the second end of the second relay of the yaw motor Connect with low level.

The first end of the yaw drive relay KA, the first end of the yaw electromagnetic relay KB, the first end of the hydraulic pump relay KC and the first end of the clockwise yaw relay KM2 are all connected with the second end of the second power-on delay relay. Connection, the second end of the yaw drive relay KA, the second end of the yaw electromagnetic relay KB, the second end of the hydraulic pump relay KC and the second end of the clockwise yaw relay KM2 are all connected to a low level.

The automatic emergency yaw control system for preventing speeding of wind turbines, further comprising: a first diode 1, a second diode 4 and a third diode 3; the conduction end of the first diode and the yaw drive circuit The high-level end of the first diode is connected to the second end of the contact of the second power-on delay relay; the conducting end of the second diode is connected to the second end of the contact of the power-off delay relay. The two ends are connected, the conducting end of the third diode is connected with the high-level end of the yaw braking circuit, and the cut-off end of the second diode is connected with the cut-off end of the third diode.

The wind turbine generator set automatic emergency yaw control system for preventing flying car further includes: an additional power supply UPS; the additional power supply is connected to the yaw motor; the additional power supply is used to provide electric energy to the yaw motor when the yaw power supply is vectored; the yaw power supply Used to supply power to the yaw motor.

Among them, the delay time of the first power-on delay relay is 2s; the delay time of the power-off delay relay is 1-2s; the delay time of the second power-on delay relay is determined according to the time used for yaw 90 degrees. The voltage of the high level is 24V, the voltage of the low level is 0V; the voltage of the additional power supply is 400V.

The present invention divides the flying car into two states: the flying car with power supply and the flying car without power supply. Powered flying means that the primary circuit of the fan has power, and the fan runs out of control; without power running, the primary system of the fan loses power, and the fan runs out of control at overspeed (for example, the collector circuit suddenly loses power and the fan runs away).

When the wind turbine has the power to fly, the speed encoder detects the overspeed, and the overspeed relay operates. At this time, KF1 in the protection control circuit operates, KT3 delays the operation, and the self-holding circuit is connected, and the holding time is T1 (T1 is 90 degrees yaw). The time used can be set according to the model. If the speed in T1 drops to the set speed (for example, set 100 rpm), KF2 will act, and the automatic emergency circuit will be cut out). At this time, the electromagnetic brake of the yaw motor is released, and the yaw The brake pressure of the air brake caliper is fully released, and the yaw contactor gets 24V after T2, and the yaw action occurs.

KT1 is a delayed power-off relay (to ensure that it deviates from the main wind direction by 90 degrees), and KT2 is a delayed power-on relay (to ensure that after the yaw brake is turned on, the yaw motor operates to avoid overcurrent tripping of the switch). Three diodes are added to the control loop to ensure reverse conduction.

The overall idea of the present invention is as follows: when the wind turbine is overspeeding, the impeller of the wind turbine deviates from the main wind direction to achieve the purpose of reducing the rotational speed. If the yaw power of the wind turbine is not lost during the overspeed, the yaw is normal. If the yaw power is lost, Then put in the backup power supply to provide the power supply for the yaw system. (Theoretically, a deviation of 90 degrees can reduce the speed of the impeller to almost no speed. In fact, after deviating from the main wind direction, the speed of the impeller can be reduced to a safe speed within a deviation of 90 degrees).

1. How to judge whether it is overspeeding:

Connect the encoder speed signal to the overspeed relay of the control loop, when the detected speed exceeds the rated speed, the fan is considered to be overspeeding.

In the speed relay, KF1 is closed when the speed exceeds the set value, and KF2 is disconnected when the speed is lower than the set value. The purpose of this selection is to output the control power from the control loop when overspeeding, and when the speed is reduced to a safe speed within the yaw range of 90 degrees When KF2 is disconnected, the control loop is not outputting the control power supply, so that the yaw does not have to be 90 degrees, which achieves the purpose of energy saving.

2. Action process after overspeed:

(1) KF1 of the speed relay is closed after the overspeed, the positive pole of the control coil of the delay relay KT3 is energized, and the negative pole is connected to zero, after a delay for a period of time (set according to the different conditions of each unit, generally about 2 seconds, the purpose is to eliminate the overspeed The signal is interfered and other factors falsely report overspeed, causing the circuit to be connected), the main contact of the delay relay KT3 is connected, at this time, the positive pole of the relay K control coil is energized, the negative pole is connected to zero, and the relay K operates.

(2) When the relay K operates, its main contact K is closed to form a self-holding loop. At this time, the positive pole of the control coil of the delay relay KT1 is energized, and the negative pole is connected to zero. Below the rated speed, but the speed is very high, the speed drops below the rated speed, KF1 is disconnected, and the positive pole of KT3 loses power. If there is no self-holding, then the positive pole of the KT1 control coil will lose power at this time. Control the power supply, the emergency yaw circuit will not work properly).

(3) The positive pole of the control coil of the delay relay KT1 is energized, and the negative pole is connected to zero. KT1 is a delay power-off relay, and the time is set to the time it takes for the yaw to 90 degrees, that is, after this time, the impeller has deviated from the main wind direction by 90 degrees. degree, its main contact KT1 is disconnected, the control circuit is not outputting the control power supply, and the emergency yaw is stopped.

(4) One way of the output control power supply controls the opening of the yaw brake, and the other way controls the yaw action. KT2 is a delay relay. Because the yaw brake needs to be turned on to be able to yaw normally, the KT2 delay relay is added to realize the control loop output. The power to control the yaw action will be output 1-2 seconds after the power to control the yaw brake to be turned on.

(5) The control loop outputs the power to the PLC. In order to prevent the output power from impacting the PLC and affecting the reliability of the equipment,

diodes

1, 2, and 3 are added. The navigating action will have normal action) the output 24V is serially connected to the external control loop, and diode 4 is added.

3. Check whether there is a yaw power supply:

When the wind turbine is flying, if there is no yaw power supply, the impeller will not be able to deviate from the main wind direction. It is necessary to accurately detect whether there is a yaw power supply. If there is no yaw power supply, it needs to accurately input the backup power supply. , It is also necessary to adjust the wiring method of the motor to drive the yaw motor with a 380V power supply. The purpose of this is to avoid the use of the backup power supply after transformation, which can save the input of the transformer.

(1) Power detection

Take the 400V terminal of the total power supply of the fan (the voltage of the yaw power supply line is 690V, but the 690V detection relay is not a standard part, and the 400V is obtained after 690V is transformed by the transformer, so it can be used as the detection voltage), connect the three A relay Ka, Kb, Kc, when 400V loses power, the relay will act accordingly. Figure 5 is a schematic diagram of the 400V wiring terminal.

(2) Overspeed and loss of yaw power

The wiring diagram of the control circuit is shown in Figure 6. When the wind turbine 400V power supply detection circuit detects an abnormal power supply and the speed encoder detects an overspeed, it is considered that the wind turbine is in the state of no yaw power supply and speeding, and the relay Ka or Kb or Kc coil loses power , the contacts of Ka or Kb or Kc are closed and the left KF1 contact is closed, and the right KF1 contact is disconnected (the contactor coils KM41, KM42, KM43, KM44 are de-energized (the box on the right side of Figure 6), the contact KM41, KM42, KM43, KM44 are closed (the box on the left of Figure 6)), after the delay T2, the coils KM31, KM32, KM33, KM34, KA, KB, KC, KM2 are energized, and the contacts KM31, KM32, KM33, KM34 When disconnected, the left and right contactors of the control loop are interlocked to avoid short circuit.

It mainly realizes the following functions of the primary circuit: the emergency circuit is put into operation at the time of T1 (KT1 delay relay) after the time of T2 (KT2 delay relay), providing a stable 400VAC power supply for the yaw motor, electromagnetic brake opening, and hydraulic oil pump motor (additional UPS power supply, adding a soft start device to avoid excessive motor starting current); yaw motor wiring is converted from "star" shape to "delta" shape (that is, from 690VAC drive to 400VAC drive); emergency power circuit and original motor The drive circuit, electromagnetic brake circuit, and hydraulic station oil pump circuit are isolated.

7 is a flow chart of a wind turbine generator set to prevent automatic emergency yaw control method for flying cars, the present invention provides a wind turbine generator set to prevent flying vehicles automatic emergency yaw control method, including:

Get the wind turbine impeller speed;

Determine whether the wind turbine impeller speed is greater than the rated speed; if it is greater than the rated speed, turn on the power of the yaw braking circuit, and turn on the power of the yaw drive circuit after delaying the preset time.

Determine whether there is a yaw power supply; if there is a yaw power supply, start the yaw motor; if there is no yaw power supply, connect the yaw motor to the additional power supply, and then start the yaw motor.

When the rotational speed of the wind turbine impeller is less than the preset safe rotational speed, the second contact of the rotational speed relay in the emergency yaw control circuit is opened.

The invention minimizes the use of high-value components such as transformers and the change of the main control program of the wind turbine, and optimizes the circuit topology structure with the most simple and reliable protection measures, so as to realize the deviation when the wind turbine is flying under various fault conditions. In the main wind direction, if the rotation speed drops below the set rotation speed within 90 degrees, the emergency circuit can be cut out, thereby protecting the safe and reliable operation of the wind turbine, providing a guarantee for personal and equipment safety, improving the availability of the fan, and realizing for the purpose of improving quality and efficiency.

The invention is reliable and easy to operate, and is suitable for all forms of wind power generating units. In particular, the old units with a long running time have not fundamentally solved this problem, although a variety of technical improvements to prevent flying have been applied. It can be used for the technical transformation of the wind turbines that have been put into operation, and can also be used in the design of wind turbines in OEMs. Not only the reliability of wind turbines will be greatly improved, but also accidents such as tower collapse and personal injury caused by wind turbines will be avoided. , and the economic benefits will also be greatly improved, which is of great significance.

In this paper, specific examples are used to illustrate the principles and implementations of the present invention. The descriptions of the above embodiments are only used to help understand the methods and core ideas of the present invention; meanwhile, for those skilled in the art, according to the present invention There will be changes in the specific implementation and application scope. In conclusion, the contents of this specification should not be construed as limiting the present invention.

The above embodiments are provided for the purpose of describing the present invention only, and are not intended to limit the scope of the present invention. The scope of the invention is defined by the appended claims. Various equivalent replacements and modifications made without departing from the spirit and principle of the present invention should be included within the scope of the present invention.

Claims

An automatic emergency yaw control system for preventing flying cars for wind turbines, characterized in that it includes:

Emergency yaw control circuit;

The input end of the emergency yaw control circuit is connected to the wind turbine impeller speed detection device, and the output end of the emergency yaw control circuit is respectively connected to the yaw driving circuit and the yaw braking circuit; the emergency yaw control circuit The circuit is used to turn on the power supply of the yaw braking circuit when the rotational speed of the wind turbine impeller exceeds the rated rotational speed, and turn on the power supply of the yaw driving circuit after a delay of a preset time.
The wind turbine generator automatic emergency yaw control system for preventing flying cars according to claim 1, further comprising:

additional power supply;

The additional power source is connected to the yaw motor; the additional power source is used to provide electrical energy to the yaw motor when the yaw power source is vectored; the yaw power source is used to provide electrical energy to the yaw motor.
The automatic emergency yaw control system for preventing flying cars for wind turbines according to claim 2, wherein the emergency yaw control circuit specifically includes:

Speed relay, first power-on delay relay, second power-on delay relay, power-off delay relay and power-on non-delay relay;

The rotational speed relay is connected to the wind turbine impeller rotational speed detection device, and the rotational speed relay is used to close the first contact of the rotational speed relay when the rotational speed of the wind turbine impeller exceeds the rated rotational speed, and when the rotational speed of the wind turbine impeller is less than the Turning on the second contact of the rotational speed relay at rated rotational speed; the first contact of the rotational speed relay is a normally open contact, and the second contact of the rotational speed relay is a normally closed contact;

The first end of the contact of the first power-on delay relay, the first end of the first contact of the power-on non-delay relay, and the first end of the second contact of the power-on non-delay relay are all connected with high level;

The second end of the contact of the first power-on delay relay, the second end of the first contact of the power-on non-delay relay, the first end of the power-on non-delay relay, and the power-off delay relay. When the first terminals of the relay are connected together;

The first end of the first power-on delay relay is connected to the speed relay, the first end of the second contact of the speed relay is connected to the second end of the power-on non-delay relay, and the power-on non-delay relay is connected. The second end of the second contact of the delay relay is connected to the first end of the contact of the power-off delay relay, and the second end of the contact of the power-off delay relay is respectively connected to the second The first end of the delay relay is connected to the yaw braking circuit;

The second end of the first power-on delay relay, the second end of the second contact of the speed relay, the second end of the power-off delay relay, and the second power-on delay relay. Both terminals are connected to low level;

The first end of the contact of the second power-on delay relay is connected to the first end of the second power-on delay relay, and the second end of the contact of the second power-on delay relay is connected to the yaw drive circuit connection.
The automatic emergency yaw control system for preventing flying cars for wind turbines according to claim 3, wherein the system further comprises:

Power relay and power detection circuit;

The power relay is connected with the total power supply of the wind turbine;

The power detection circuit is used to switch the wiring mode of the yaw motor when the rotational speed of the impeller of the wind turbine exceeds the rated rotational speed and the yaw power supply vector power.
The wind turbine automatic emergency yaw control system for preventing flying cars according to claim 4, wherein the power detection circuit specifically includes:

Yaw motor first relay, yaw motor second relay, yaw drive relay, yaw electromagnetic relay, hydraulic pump relay and clockwise yaw relay;

The first end of the normally closed contact of the power supply relay is connected to the high level, the second end of the normally closed contact of the power supply relay is connected to the first end of the normally open contact of the rotational speed relay, and the The second end of the normally open contact of the speed relay is connected to the first end of the second power-on delay relay, and the second end of the second power-on delay relay is connected to the normally closed second relay of the yaw motor. The first end of the contact is connected, the second end of the normally closed contact of the second relay of the yaw motor is connected to the first end of the first relay of the yaw motor, and the first end of the first relay of the yaw motor is connected. The two terminals are connected to low level;

The first end of the normally open contact of the power relay is connected to the high level, the first end of the normally closed contact of the speed relay is connected to the high level, and the second end of the normally open contact of the power relay is connected to the high level. The terminal and the second terminal of the normally closed contact of the speed relay are both connected to the first terminal of the normally closed contact of the first relay of the yaw motor, and the normally closed contact of the first relay of the yaw motor The second end is connected to the first end of the second relay of the yaw motor, and the second end of the second relay of the yaw motor is connected to the low level;

The first end of the yaw drive relay, the first end of the yaw electromagnetic relay, the first end of the hydraulic pump relay and the first end of the clockwise yaw relay are all energized with the second The second end of the delay relay is connected, the second end of the yaw drive relay, the second end of the yaw electromagnetic relay, the second end of the hydraulic pump relay and the first end of the clockwise yaw relay. Both ends are connected to low level.
The automatic emergency yaw control system for preventing flying cars for wind turbines according to claim 5, wherein the system further comprises:

a first diode, a second diode and a third diode;

The conducting end of the first diode is connected to the high-level end of the yaw driving circuit, and the cut-off end of the first diode is connected to the second end of the contact of the second power-on delay relay connect;

The conducting end of the second diode is connected to the second end of the contact of the power-off delay relay, and the conducting end of the third diode is connected to the high voltage of the yaw braking circuit. The flat end is connected, and the cut-off end of the second diode is connected with the cut-off end of the third diode.
The automatic emergency yaw control system for preventing flying cars for wind turbines according to claim 6, wherein,

The delay time of the first power-on delay relay is 2s;

The delay time of the power-off delay relay is 1-2s;

The delay time of the second power-on delay relay is determined according to the time taken to yaw by 90 degrees.
The wind turbine generator automatic emergency yaw control system for preventing flying cars according to claim 7, characterized in that,

The voltage of the high level is 24V;

The voltage of the low level is 0V;

The voltage of the additional power supply is 400V.
An automatic emergency yaw control method for preventing flying cars for wind turbines, characterized in that it is applied to the automatic emergency yaw control system for preventing flying cars for wind turbines according to any one of claims 1-8; the method includes:

Get the wind turbine impeller speed;

Determine whether the wind turbine impeller speed is greater than the rated speed; if it is greater than the rated speed, turn on the power of the yaw braking circuit, and turn on the power of the yaw drive circuit after a preset time delay.
The automatic emergency yaw control method for preventing flying cars of a wind turbine according to claim 9, wherein the yaw braking circuit is turned on after the power supply of the yaw braking circuit is turned on, and the yaw is turned on after a delay of a preset time. The power supply for the drive circuit, and after that:

Determine whether there is a yaw power supply; if there is a yaw power supply, start the yaw motor; if there is no yaw power supply, connect the yaw motor to an additional power supply, and then start the yaw motor.
The automatic emergency yaw control method for preventing flying cars of a wind turbine according to claim 10, wherein after starting the yaw motor, the method further comprises:

When the rotational speed of the impeller of the wind generator set is less than the preset safe rotational speed, the second contact of the rotational speed relay in the emergency yaw control circuit is opened.