CN113446155A - Wind generating set operation control method, variable pitch controller and variable pitch driver - Google Patents

Abstract

Embodiments of the present invention provide an operation control method, a pitch controller and a pitch driver for a wind turbine. The wind method includes: when the wind turbine is in a blade feathering process and a limit switch of the blade fails, Adjust the current pitch speed to the target speed, and send the target speed to the pitch driver, so that the pitch driver controls the pitch motor to stop working according to the target speed; or, generate means to switch the pitch mode from the current mode to the manual mode and send the target control signal to the pitch driver, so that the pitch driver can adjust the current pitch mode to manual mode according to the target control signal. According to the embodiment of the present invention, the problem of excessive rotation of the blades caused by the failure of the limit switch can be avoided, and the safety of the wind power generating set can be ensured.

Description

Wind turbine operation control method, pitch controller and pitch driver

technical field

The invention relates to the technical field of wind power generation, in particular to an operation control method of a wind power generating set, a pitch controller and a pitch driver.

Background technique

The pitch system is an important functional part of the wind turbine. When the wind turbine is stopped, the pitch controller will control the pitch motor to feather the blades, and control the blades to rotate in the direction of 90 degrees. There is a limit switch on the blade rotation path. In this case, the limit switch will be triggered when the blade passes through the limit switch, and the pitch controller will control the pitch motor to stop working after receiving the trigger signal of the limit switch. However, the limit switch may fail during use, such as position offset or communication failure, etc., so that the limit switch cannot be triggered normally when the blade passes, resulting in excessive rotation of the blade and eventually damage to the wind turbine components.

SUMMARY OF THE INVENTION

The embodiments of the present invention provide an operation control method, a pitch controller and a pitch driver for a wind turbine, which can avoid the problem of excessive blade rotation caused by the failure of a limit switch and ensure the safety of the wind turbine.

In a first aspect, an embodiment of the present invention provides an operation control method for a wind turbine, which is used in a pitch controller, and the method includes:

When the wind turbine is in the process of blade feathering and the limit switch of the blade is invalid, adjust the current pitch speed to the target speed, and send the target speed to the pitch driver, so that the pitch driver can control according to the target speed The pitch motor stops working;

Alternatively, a target control signal representing switching the pitch mode from the current mode to the manual mode is generated, and the target control signal is sent to the pitch driver, so that the pitch driver adjusts the current pitch mode to the manual mode according to the target control signal.

In a possible implementation of the first aspect, before adjusting the pitch speed from the current speed to the target speed or generating the target control signal indicating switching the current pitch mode to the manual mode, the method further includes: determining a limit Bit switch failed. Determining the failure of the limit switch specifically includes: obtaining the trigger state of the limit switch and the trigger state of the proximity switch corresponding to the limit switch, and the angle difference between the proximity switch and the limit switch is less than a preset angle; judging that the limit switch is in Whether the proximity switch is not triggered within the first accumulated time period after the proximity switch is triggered; if the limit switch is not triggered within the first accumulated time period after the proximity switch is triggered, determine whether the angle of the blade is greater than the preset safety angle; if the angle of the blade is greater than the preset safety angle safety angle, the limit switch is determined to be invalid.

In a possible implementation of the first aspect, an encoder is provided on the rotating shaft of the pitch motor of the blade, and the angle of the blade is measured by the encoder; judging whether the angle of the blade is greater than a preset safety angle includes: in When there is no jump fault in the encoder, it is judged whether the angle of the blade is greater than the preset safe angle.

In a possible implementation of the first aspect, before adjusting the pitch speed from the current speed to the target speed or generating the target control signal indicating switching the pitch mode from the current pitch mode to the manual mode, the method further Including: confirming that there is no jump fault in the encoder. Determining that the encoder does not have a jump fault, specifically includes: calculating the rate of change of the blade angle of the first period relative to the second period to obtain the first rate of change, and the second period is one or more periods located ahead of the first period; Calculate the ratio of the voltage difference between the pitch motor voltage of the first cycle and the pitch motor voltage of the second cycle to the pitch motor voltage of the second cycle to obtain the second rate of change; calculate the first rate of change, the second rate of change Determine whether the absolute value of the multiple deviations are all within the preset allowable range; if more The absolute value of each deviation is all within the preset allowable range, then it is determined that there is no jump fault in the encoder.

In a possible implementation of the first aspect, adjusting the pitch speed from the current speed to the target speed includes: setting the target flag position indicating the failure of the limit switch to obtain setting information; The paddle speed is adjusted from the current speed to the target speed.

In a second aspect, an embodiment of the present invention provides an operation control method for a wind turbine, which is used for a pitch drive, and the method includes:

Receive the analog signal sent by the pitch controller, obtain the pitch speed according to the analog signal, and control the pitch motor to stop working when the pitch speed is the target speed;

Or, receive the control signal sent by the pitch controller, and adjust the current pitch mode to the manual mode when the control signal is the target control signal indicating that the pitch mode is switched from the current mode to the manual mode.

In a third aspect, an embodiment of the present invention provides a pitch controller, including:

The adjustment module is used to adjust the current pitch speed to the target speed when the wind turbine is in the blade feathering process and the limit switch of the blade fails;

The first sending module is used for sending the target speed to the pitch driver, so that the pitch driver controls the pitch motor to stop working according to the target speed;

or,

a generating module for generating a target control signal representing switching the pitch mode from the current mode to the manual mode;

The second sending module is used for sending the target control signal to the pitch driver, so that the pitch driver adjusts the current pitch mode to the manual mode according to the target control signal.

In a fourth aspect, an embodiment of the present invention provides a pitch driver, including:

The first receiving module is used for receiving the analog signal sent by the pitch controller;

The control module is used to obtain the pitch speed according to the analog signal, and control the pitch motor to stop working when the pitch speed is the target speed;

or,

The second receiving module is used to receive the control signal sent by the pitch controller;

The switching module is used to adjust the pitch mode from the current mode to the manual mode when the control signal is the target control signal indicating that the pitch mode is switched from the current mode to the manual mode.

In a fifth aspect, an embodiment of the present invention provides an operation control system for a wind turbine generator set, comprising: the above pitch controller and the above pitch driver, wherein the pitch controller is electrically connected to the pitch driver.

In a possible implementation of the first aspect, the wind turbine operation control system further includes: a first communication line, disposed between the pitch controller and the pitch driver, for transmitting an analog signal representing the pitch speed ; The second communication line is arranged between the pitch controller and the pitch driver, and is used to transmit a control signal representing the pitch mode switching operation.

In a fifth aspect, an embodiment of the present invention provides a computer-readable storage medium storing instructions, and when the instructions are executed by at least one computing device, the computing device is prompted to execute the above-described wind turbine operation control method.

In the wind turbine operation control method in the embodiment of the present invention, when the limit switch of the blade fails, on the one hand, the pitch speed can be adjusted from the current speed to the target speed and the target speed can be sent to the pitch driver, so that the The paddle driver controls the pitch motor to stop working according to the target speed; on the other hand, it can generate a target control signal indicating that the pitch mode is switched from the current mode to the manual mode and send the target control signal to the pitch driver, so that the pitch driver can be based on The target control signal adjusts the pitch mode from the current mode to the manual mode, so as to avoid the problem of excessive blade rotation caused by the failure of the limit switch and ensure the safety of the wind turbine.

Description of drawings

The present invention can be better understood from the following description of specific embodiments of the present invention in conjunction with the accompanying drawings, wherein the same or similar reference numerals denote the same or similar features.

1 is a schematic diagram of the structural components related to the detection of the blade angle of the wind turbine;

2 is a schematic flowchart of a method for controlling the operation of a wind turbine according to an embodiment of the present invention;

3 is a schematic diagram of an electrical connection relationship between a pitch controller and a pitch driver provided by an embodiment of the present invention;

4 is a schematic flowchart of a method for controlling the operation of a wind turbine according to another embodiment of the present invention;

5 is a schematic diagram of an electrical connection relationship between a pitch controller and a pitch driver provided by another embodiment of the present invention;

6 is a schematic flowchart of a method for judging failure of a limit switch according to an embodiment of the present invention;

7 is a schematic flowchart of an encoder jump fault detection method provided by an embodiment of the present invention;

8 is a schematic flowchart of a method for controlling the operation of a wind turbine according to another embodiment of the present invention;

FIG. 9 is a schematic flowchart of a method for controlling the operation of a wind turbine according to another embodiment of the present invention;

10 is a schematic structural diagram of a wind turbine operation control device provided by an embodiment of the present invention;

11 is a schematic structural diagram of a wind turbine operation control device provided by another embodiment of the present invention;

12 is a schematic structural diagram of a wind turbine operation control device provided by another embodiment of the present invention;

FIG. 13 is a schematic structural diagram of an operation control device for a wind turbine according to still another embodiment of the present invention.

Detailed ways

Features and exemplary embodiments of various aspects of the invention are described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention.

The wind turbine operation control method in the embodiment of the present invention is used in a blade feathering scenario. There is a communication line between the pitch controller and the pitch drive of the pitch system of the wind turbine. When the pitch is normal, the pitch controller sends the pitch speed given value to the pitch drive. The form can be an analog signal, and the pitch driver drives the pitch motor to work according to the pitch speed given value, so that the blade continues to retract in the 90-degree direction until the limit switch is triggered.

Figure 1 shows the structural components related to the angle detection of wind turbine blades, including: a reducer 101, a transmission wheel 102, a tensioner 103, a tensioner 104, a hub 105, a toothed belt 106, a blade installation device 107, Toothed belt fixing block 108 , toothed belt fixing block 109 , tensioner fixing device 110 , 87-degree proximity switch 111 , block 112 , 5-degree proximity switch 113 , bearing inner ring 114 and 91-degree limit switch 115 .

Among them, the reducer 101 is engaged with a pitch motor (not shown in the figure). The transmission wheel 102 is mechanically connected with the output shaft of the reducer 101 . The reducer 101 and the tensioning wheel fixing device 110 are fixedly installed on the wheel hub 105 . The tensioner fixing device 110 is used for fixing the tensioner 103 and the tensioner 104 . The tensioning wheel 103 and the tensioning wheel 104 are used to tension the toothed belt 106 to ensure the reliability of transmission. The 87-degree proximity switch 111, the 5-degree proximity switch 113, and the 91-degree limit switch 115 are installed on the hub 105 and do not rotate with the blade, and the 87-degree proximity switch 111 is installed at the 87-degree position of the blade, and the 5-degree proximity switch 113 is installed on the blade The 5 degree position of the 91 degree limit switch 115 is installed at the 91 degree position of the blade. The block 112 is installed on the blade installation device 107 and can rotate with the blade installation device 107 , and the blade installation device 107 specifically refers to the pitch bearing and the components connected to the pitch bearing.

During the blade feathering process, the stopper 112 rotates with the blade, first triggers the 87-degree proximity switch 111, and then triggers the 91-degree limit switch 115 after a period of time. At this time, the hardware circuit connected to the 91-degree limit switch 115 is disconnected. The signal input to the enabling terminal of the pitch driver becomes a non-enable signal, the pitch driver stops driving the pitch motor, and the blades stop feathering.

However, the limit switch may fail during use, such as position offset or communication failure, etc., so that the limit switch cannot be triggered normally when the blade passes, resulting in the blade reaching a safe position (such as 91 degrees) and cannot stop after Operation, resulting in mechanical parts in the pitch system, such as the toothed belt is broken, the mechanical parts are damaged, etc., and cause the downtime of the unit, prolong the maintenance time, and even affect the safe operation of the wind turbine in severe cases.

Based on this, an embodiment of the present invention provides a wind turbine operation control method for a pitch controller. Referring to FIG. 2 , the wind turbine operation control method includes the following steps:

Step 201, the pitch controller adjusts the current pitch speed to the target speed when the wind turbine is in the blade feathering process and the limit switch of the blade fails.

Specifically, when the wind turbine is in the blade feathering process and the limit switch of the blade fails, the pitch controller can position the target mark indicating the failure of the limit switch to the position information, and according to the position information The paddle speed is adjusted from the current speed to the target speed. Here, the target speed can be 0. In this way, no hardware modification is required, but the register flag can be increased.

Step 202, the pitch controller sends the target speed to the pitch driver, so that the pitch driver controls the pitch motor to stop working according to the target speed.

3, a communication line is established between the analog signal output interface AO of the pitch controller 301 and the analog signal input interface AI of the pitch driver 304, and the pitch controller 301 can send the target speed to the pitch through the communication line. driver 304 .

In the wind turbine operation control method according to the embodiment of the present invention, the pitch controller adjusts the current pitch speed to 0 when the wind turbine is in the blade feathering process and the limit switch of the blade fails Send it to the pitch drive, so that the pitch drive controls the pitch motor to stop working according to the speed, so that the blades stop feathering. In this way, it can avoid the problem of excessive rotation of the blades caused by the failure of the limit switch, and ensure the safety of the wind turbine. .

FIG. 3 also shows the electrical connection relationship between the limit switch 305 and the manual switch 306 . The contact of the limit switch 305 is a normally closed contact, and the line where the limit switch 305 is located is turned on in a normal state. The manual switch 306 is a manual knob, the contact of the manual switch 306 is a normally open contact, and the line where the manual switch 306 is located is disconnected in a normal state. The power supply 307 is used to provide electrical signals for the pitch system and the pitch drive enable input.

Currently, after manual switch 306 is triggered, pitch drive 304 enters manual mode. The priority of the manual mode is higher than that of the automatic mode and the failure mode. After entering the manual mode, the pitch driver 304 no longer executes the speed command issued by the pitch controller 301, but stops driving the blades to pitch.

Also shown in FIG. 3 are two digital communication (DO-DI) lines connected between pitch controller 301 and pitch driver 304 . One of the digital communication lines 302 is used to transmit forward pitch signals, which means that the blades are pitched in the direction of 0 degrees, and the other digital communication line 303 is used to transmit backward pitch signals. The blades are pitched to 90 degrees.

Currently, the pitch driver 304 drives the blades to 0 degrees only when the forward pitching knob (not shown in the figure) is triggered and the forward pitching signal 302 output by the pitch controller 301 is a high-level signal When pitching, or triggering the knob for backward pitching (not shown in the figure) and the backward pitching signal 303 output by the pitch controller 301 is a high-level signal, the pitching driver 304 drives the blades to the 90-degree direction. Pitch.

It can be seen from the above analysis that the pitch drive 304 can also stop the blade feathering when it enters the manual mode. However, at present, the pitch drive can only be entered into the manual mode by triggering the manual switch 306 .

Based on this, an embodiment of the present invention further provides an operation control method for a wind turbine, which is used for a pitch controller. Referring to Figure 4, the wind turbine operation control method includes the following steps:

Step 401, when the wind turbine is in the blade feathering process and the limit switch of the blade fails, the pitch controller generates a target control signal indicating that the pitch mode is switched from the current mode to the manual mode.

Step 402, the pitch controller sends the target control signal to the pitch driver, so that the pitch driver adjusts the current pitch mode to the manual mode according to the target control signal.

5, a digital communication line 501 is added between the pitch controller 301 and the pitch driver 304, and the pitch controller 501 can use the digital communication line 501 to switch the pitch mode from the current mode to the manual mode. The target control signal is sent to pitch driver 304 .

In the wind turbine operation control method according to the embodiment of the present invention, when the wind turbine is in the blade feathering process and the limit switch of the blade fails, the pitch controller generates a signal indicating that the pitch mode is switched from the current mode to the manual mode and send the target control signal to the pitch drive, so that the pitch drive adjusts the current pitch mode to manual mode according to the target control signal, so that even if the manual switch does not need to be triggered, the current pitch can be adjusted The mode is switched to manual mode to achieve the purpose of stopping the blade feathering, thereby avoiding the problem of excessive blade rotation caused by the failure of the limit switch, and ensuring the safety of the wind turbine.

It should be noted that among the two methods of stopping blade feathering given above, the method of adjusting the pitch speed by the pitch controller does not need to change the existing hardware, and the pitch controller can adjust the pitch speed through the original communication line. The latter pitch speed can be transmitted to the pitch drive. However, the way that the pitch controller generates a control signal indicating that the current pitch mode is switched to the manual mode needs to add a communication line, which is used for the pitch controller to send the generated control signal to the pitch driver. Personnel can choose the appropriate method according to the actual situation.

The method for judging the failure of the limit switch will be described in detail below. As shown in Figure 6, the method for judging the failure of the limit switch may include:

Step 601 , acquiring the trigger state of the limit switch and the trigger state of the proximity switch corresponding to the limit switch.

Wherein, the angle difference between the proximity switch and the limit switch is smaller than the preset angle. Referring to FIG. 1 , the proximity switch may be an 87-degree proximity switch 111 , and the limit switch may be a 91-degree limit switch 115 . During the blade feathering process, the block 112 will rotate with the blade. During the process of the block 112 rotating with the blade, the 87-degree proximity switch 111 is triggered first, and then the 91-degree limit switch 115 is triggered after a period of time.

Step 602, determining whether the limit switch has not been triggered within the first accumulated time period after the proximity switch is triggered.

Wherein, the first accumulated duration may be determined according to the angle difference between the proximity switch and the limit switch and the pitch speed. Under normal circumstances, the limit switch will be triggered within the first accumulated time after the proximity switch is triggered. If the limit switch is not triggered within the first accumulated time after the proximity switch is triggered, it indicates that the limit switch may fail and needs to enter. judgment of the next step.

Step 603 , if the limit switch is not triggered within the first accumulated time period after the proximity switch is triggered, determine whether the angle of the blade is greater than the preset safety angle.

Step 604, if the angle of the blade is greater than the preset safety angle, it is determined that the limit switch is invalid.

After the limit switch fails, the pitch driver will continue to drive the blade to rotate in a direction greater than 90 degrees. If the angle of the blade is greater than the preset safe angle, such as 100 degrees, it means that the blade does not stop after passing the limit switch, but Continue to rotate, at this point, it can be determined that the limit switch has failed.

Among them, the angle of the blade can be measured by the encoder, and the encoder is installed on the rotating shaft of the pitch motor. In some cases, due to the unstable signal transmission, the blade angle measured by the encoder will temporarily jump. Jump to a larger value, but return to normal in the next second. In this case, if step 604 is continued to be executed, it will lead to a misjudgment of the failure state of the limit switch. Therefore, in order to improve the accuracy of judging the failure state of the limit switch, it is necessary to ensure that the blade angle does not change during the execution of step 604. There are jumps.

In order to detect the blade angle measured by the encoder for jump detection, the inventor analyzed the detection principle of the encoder and the mechanical principle of the blade rotation, and found that:

First, the blade angle can be calculated from the number of pulses output by the encoder. At the same time, the blade angle is also the result of the pitch motor executing the pitch speed given value (pitch speed command) issued by the pitch controller. Therefore, the encoding There is a positive correlation between the blade angle measured by the sensor and the pitch speed given value.

Secondly, the speed of the pitch motor can be calculated from the number of pulses output by the encoder per unit time. At the same time, there is a positive correlation between the speed of the pitch motor and the voltage. Therefore, the blade angle measured by the encoder and the voltage of the pitch motor also exist Positive relationship.

Therefore, there is a positive correlation between the blade angle measured by the encoder, the set value of the pitch speed and the voltage of the pitch motor. Since the voltage of the pitch motor is relatively stable, it can be based on the positive correlation between the above three. The relationship performs jump detection on the blade angle measured by the encoder.

Referring to Figure 7, the method for determining that the encoder does not have a jump fault includes:

Step 701: Calculate the rate of change of the blade angle of the first period relative to the second period to obtain the first rate of change, where the second period is one or more periods ahead of the first period.

In this step, the first rate of change can be understood as the rate of change of the blade angle measured by the encoder. The first rate of change may be the ratio of the angle difference between the blade angle of the first period and the blade angle of the second period to the blade angle of the second period, or may be the blade angle of the second period and the blade angle of the first period The ratio is not limited here.

Step 702: Calculate the ratio of the voltage difference between the pitch motor voltage of the first cycle and the pitch motor voltage of the second cycle to the pitch motor voltage of the second cycle to obtain a second rate of change.

In this step, the second rate of change can be understood as the rate of change of the voltage of the pitch motor.

Step 703: Calculate the difference between any two of the first rate of change, the second rate of change, and the rate of change of the given value of the speed command issued by the pitch controller, to obtain a plurality of deviations.

Step 704: Determine whether the absolute values of the multiple deviations are all within a preset allowable range.

Step 705, if the absolute values of the multiple deviations are all within the preset allowable range, it is determined that the encoder does not have a jump fault.

Since there is a positive correlation between the blade angle measured by the encoder, the set value of the pitch speed and the voltage of the pitch motor, under normal circumstances, the first rate of change, the second rate of change and the pitch controller The rate of change of the given value of the issued speed command should be equal. Correspondingly, if the absolute values of the above-mentioned multiple deviations are all within the preset allowable range, it means that the first rate of change, the second rate of change, and the rate of change of the speed command given value issued by the pitch controller are numerically close. .

Considering that the voltage of the pitch motor is relatively stable, therefore, when the rate of change of the voltage of the pitch motor, the rate of change of the speed command given value issued by the pitch controller and the rate of change of the blade angle are consistent, it can be considered that If the change rate of the blade angle does not have a large jump, it can be determined that there is no jump fault in the encoder.

An embodiment of the present invention further provides a wind turbine operation control method for a pitch drive. Referring to FIG. 8 , the wind turbine operation control method includes:

Step 801, receiving an analog signal sent by the pitch controller;

Step 802, control the pitch motor to stop working when the pitch speed is the target speed.

Here, the target velocity can be 0. In this embodiment, when the wind turbine is in the process of blade feathering and the limit switch of the blade fails, the pitch driver can control the pitch motor to stop working according to the received target speed (0), so that the blade stops smoothing In this way, the problem of excessive rotation of the blades caused by the failure of the limit switch can be avoided, and the safety of the wind turbine can be ensured.

An embodiment of the present invention further provides a method for controlling the operation of a wind turbine, which is used for a pitch drive. Referring to FIG. 9 , the method for controlling the operation of a wind turbine includes:

Step 901, receiving a control signal sent by a pitch controller;

Step 902, when the control signal is a target control signal indicating switching the pitch mode from the current mode to the manual mode, adjust the current pitch mode to the manual mode.

In this embodiment, when the wind turbine is in the blade feathering process and the limit switch of the blade fails, the pitch driver can adjust the current pitch mode to the manual mode according to the received target control signal. The manual switch needs to be triggered, and the current pitch mode can also be switched to the manual mode to achieve the purpose of stopping the blade feathering, thereby avoiding the problem of excessive blade rotation caused by the failure of the limit switch, and ensuring the safety of the wind turbine.

An embodiment of the present invention further provides a pitch controller. Referring to FIG. 10 , the pitch controller includes an adjustment module 1001 and a first sending module 1002 .

The adjustment module 1001 is used to adjust the current pitch speed to the target speed when the wind turbine is in the blade feathering process and the limit switch of the blade fails.

The first sending module 1002 is configured to send the target speed to the pitch driver, so that the pitch driver controls the pitch motor to stop working according to the target speed.

In this embodiment, the target speed may be 0, and the adjustment module of the pitch controller adjusts the current pitch speed to 0 when the wind turbine is in the blade feathering process and the limit switch of the blade fails, and passes the first The sending module sends the speed to the pitch drive, so that the pitch drive controls the pitch motor to stop working according to the speed, so that the blade stops feathering. In this way, the problem of excessive rotation of the blade caused by the failure of the limit switch can be avoided. Ensure the safety of wind turbines.

An embodiment of the present invention further provides a pitch controller. Referring to FIG. 11 , the pitch controller includes a generating module 1101 and a second sending module 1102 .

Wherein, the generating module 1101 is configured to generate a target control signal indicating switching the pitch mode from the current mode to the manual mode.

The second sending module 1102 is configured to send the target control signal to the pitch driver, so that the pitch driver adjusts the current pitch mode to the manual mode according to the target control signal.

In this embodiment, when the wind turbine is in the blade feathering process and the limit switch of the blade fails, the generation module of the pitch controller generates a target control signal indicating that the pitch mode is switched from the current mode to the manual mode, and The target control signal is sent to the pitch driver through the second sending module, so that the pitch driver adjusts the current pitch mode to the manual mode according to the target control signal. In this way, even if the manual switch does not need to be triggered, the current pitch mode can be changed. Switch to manual mode to achieve the purpose of stopping blade feathering, thereby avoiding the problem of excessive blade rotation caused by the failure of the limit switch, and ensuring the safety of the wind turbine.

It should be noted that, the pitch controller in the embodiment of the present invention may integrate the adjustment module 1001, the first sending module 1002, the generating module 1101, and the second sending module 1102 at the same time, or it may only integrate the adjustment module 1001 and the first sending module 1102. The sending module, or only the generating module 1101 and the second sending module 1102 are integrated, which is not limited here.

An embodiment of the present invention further provides a pitch driver. Referring to FIG. 12 , the pitch driver includes a first receiving module 1201 and a control module 1202 .

The first receiving module 1201 is used for receiving the analog signal sent by the pitch controller.

The control module 1202 is configured to obtain the pitch speed according to the analog signal, and control the pitch motor to stop working when the pitch speed is the target speed. Among them, the target speed can be 0.

In this embodiment, when the wind turbine is in the blade feathering process and the limit switch of the blade fails, the control module of the pitch driver can control the pitch motor to stop according to the target speed (0) received by the first receiving module work, so that the blades stop feathering. In this way, the problem of excessive rotation of the blades caused by the failure of the limit switch can be avoided, and the safety of the wind turbine can be ensured.

An embodiment of the present invention further provides a pitch driver. Referring to FIG. 13 , the pitch driver includes a second receiving module 1301 and a switching module 1302 .

The second receiving module 1301 is configured to receive the control signal sent by the pitch controller.

The switching module 1302 is configured to adjust the pitch mode from the current mode to the manual mode when the control signal is a target control signal indicating switching the pitch mode from the current mode to the manual mode.

In this embodiment, when the wind turbine is in the blade feathering process and the limit switch of the blade fails, the switching module of the pitch driver can adjust the current pitch mode to the target control signal received by the second receiving module. Manual mode, in this way, even if the manual switch does not need to be triggered, the current pitch mode can be switched to manual mode to achieve the purpose of stopping the blade feathering, thereby avoiding the problem of excessive blade rotation caused by the failure of the limit switch, ensuring wind Generator set safety.

It should be noted that, the pitch driver in the embodiment of the present invention may be integrated with the first receiving module 1201, the control module 1202, the second receiving module 1301, and the switching module 1302 at the same time, or may be only integrated with the first receiving module 1201 and the control module 1302. The module 1202, or only the second receiving module 1301 and the switching module 1302 are integrated, which is not limited here.

An embodiment of the present invention further provides an operation control system for a wind turbine generator set. The operation control system for a wind turbine generator set includes: the above-mentioned pitch controller and the above-mentioned pitch driver, and the pitch controller is electrically connected to the pitch driver .

In some embodiments, the wind turbine operation control system further includes a first communication line and a second communication line. Wherein, the first communication line is set between the pitch controller and the pitch driver for transmitting an analog signal representing the pitch speed (refer to the AO-AI line in FIG. 3 ); the second communication line is set between the pitch control Between the controller and the pitch driver, a control signal (refer to 501 in FIG. 5 ) representing the switching operation of the pitch mode is transmitted.

Embodiments of the present invention further provide a computer-readable storage medium storing instructions, when the instructions are executed by at least one computing device, the computing device is prompted to execute the above-mentioned wind turbine operation control method; or, when the instructions are executed by at least one computing device When the device is running, the computing device is prompted to execute the above-described wind turbine operation control method.

It should be clear that each embodiment in this specification is described in a progressive manner, and the same or similar parts of each embodiment may be referred to each other, and each embodiment focuses on the differences from other embodiments. place. For the apparatus embodiment, reference may be made to the description part of the method embodiment for relevant places. Embodiments of the present invention are not limited to the specific steps and structures described above and shown in the figures. Those skilled in the art may make various changes, modifications and additions, or change the order between steps, after comprehending the spirit of the embodiments of the present invention. Also, for the sake of brevity, detailed descriptions of known methods and techniques are omitted here.

The functional blocks shown in the above-described structural block diagrams may be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an application specific integrated circuit (ASIC), suitable firmware, a plug-in, a function card, or the like. When implemented in software, elements of embodiments of the invention are programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine-readable medium or transmitted over a transmission medium or communication link by a data signal carried in a carrier wave. A "machine-readable medium" may include any medium that can store or transmit information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio frequency (RF) links, and the like. The code segments may be downloaded via a computer network such as the Internet, an intranet, or the like.

The embodiments of the present invention may be implemented in other specific forms without departing from the spirit and essential characteristics thereof. For example, the algorithms described in particular embodiments may be modified without departing from the basic spirit of the embodiments of the invention in system architecture. Accordingly, the present embodiments are to be regarded in all respects as illustrative and not restrictive, and the scope of the embodiments of the present invention is defined by the appended claims rather than the foregoing description, and falls within the meaning and equivalence of the claims All changes within the scope of the present invention are thus included in the scope of the embodiments of the present invention.

Claims (11)

1. A wind generating set operation control method is characterized by being used for a variable pitch controller, and the method comprises the following steps:

when the wind generating set is in a blade feathering process and a limit switch of a blade fails, adjusting the current variable pitch speed to a target speed, and sending the target speed to a variable pitch driver so that the variable pitch driver controls a variable pitch motor to stop working according to the target speed;

or generating a target control signal for switching the pitch changing mode from the current mode to the manual mode, and sending the target control signal to a pitch changing driver, so that the pitch changing driver adjusts the current pitch changing mode to the manual mode according to the target control signal.

2. The method of claim 1, wherein prior to the adjusting the pitch speed from the current speed to the target speed or generating the target control signal indicative of switching the current pitch mode to the manual mode, the method further comprises: determining that the limit switch is failed;

the determining that the limit switch is disabled comprises:

acquiring a trigger state of the limit switch and a trigger state of a proximity switch corresponding to the limit switch, wherein an angle difference between the proximity switch and the limit switch is smaller than a preset angle;

judging whether the limit switch is not triggered within a first accumulated time length after the proximity switch is triggered;

if the limit switch is not triggered within a first accumulated time length after the proximity switch is triggered, judging whether the angle of the blade is larger than a preset safety angle or not;

and if the angle of the blade is larger than the preset safety angle, determining that the limit switch is invalid.

3. The method according to claim 2, characterized in that an encoder is arranged on a rotating shaft of a pitch motor of the blade, and the angle of the blade is measured by the encoder; judge whether the angle of blade is greater than preset safe angle includes:

and under the condition that the encoder has no jump fault, judging whether the angle of the blade is larger than a preset safety angle.

4. The method of claim 3, wherein prior to the adjusting the pitch speed from the current speed to the target speed or generating the target control signal indicative of switching the pitch mode from the current pitch mode to the manual mode, the method further comprises: determining that there is no transition fault with the encoder;

the determining that the encoder does not have a transition fault comprises:

calculating the change rate of the blade angle of a first period relative to a second period to obtain a first change rate, wherein the second period is one or more periods located in front of the first period;

calculating the ratio of the voltage difference between the variable pitch motor voltage in the first period and the variable pitch motor voltage in the second period to obtain a second change rate;

calculating the difference between any two of the first change rate, the second change rate and the change rate of the speed instruction given value sent by the variable pitch controller to obtain a plurality of deviations;

judging whether the absolute values of the deviations are all within a preset allowable range;

and if the absolute values of the deviations are all within the preset allowable range, determining that the encoder has no jump fault.

5. The method of claim 1, wherein the adjusting the pitch speed from the current speed to the target speed comprises:

setting the target mark position indicating the failure of the limit switch to obtain set information;

and adjusting the variable pitch speed from the current speed to a target speed according to the set information.

6. A wind turbine generator system operation control method for a pitch drive, the method comprising:

receiving an analog signal sent by the variable pitch controller, obtaining a variable pitch speed according to the analog signal, and controlling a variable pitch motor to stop working when the variable pitch speed is a target speed;

or receiving a control signal sent by the pitch controller, and adjusting the current pitch mode to the manual mode when the control signal is a target control signal indicating that the pitch mode is switched from the current mode to the manual mode.

7. A pitch controller, comprising:

the adjusting module is used for adjusting the current variable pitch speed to a target speed under the condition that the wind generating set is in a blade feathering process and a limit switch of a blade fails;

the first sending module is used for sending the target speed to a variable pitch driver so that the variable pitch driver controls a variable pitch motor to stop working according to the target speed;

or,

a generation module for generating a target control signal representing switching the pitch mode from the current mode to the manual mode;

and the second sending module is used for sending the target control signal to a variable pitch driver so that the variable pitch driver adjusts the current variable pitch mode into a manual mode according to the target control signal.

8. A pitch drive, comprising:

the first receiving module is used for receiving the analog signal sent by the variable pitch controller;

the control module is used for obtaining a variable pitch speed according to the analog signal and controlling a variable pitch motor to stop working when the variable pitch speed is a target speed;

or,

the second receiving module is used for receiving the control signal sent by the variable pitch controller;

and the switching module is used for adjusting the pitch mode from the current mode to the manual mode when the control signal is a target control signal which represents that the pitch mode is switched from the current mode to the manual mode.

9. An operation control system of a wind generating set, comprising: a pitch controller according to claim 6 and a pitch drive according to claim 7, said pitch controller being electrically connected to said pitch drive.

10. The system of claim 9, further comprising:

the first communication line is arranged between the variable pitch controller and the variable pitch driver and used for transmitting an analog signal representing the variable pitch speed;

and the second communication line is arranged between the variable pitch controller and the variable pitch driver and is used for transmitting a control signal representing the variable pitch mode switching operation.

11. A computer-readable storage medium storing instructions that, when executed by at least one computing device, cause the computing device to perform a wind park operational control method according to any of claims 1-5;

alternatively, the instructions, when executed by at least one computing device, cause the computing device to perform the wind park operational control method of claim 6.

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