CN113446155A - Wind generating set operation control method, variable pitch controller and variable pitch driver - Google Patents
Wind generating set operation control method, variable pitch controller and variable pitch driver Download PDFInfo
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- CN113446155A CN113446155A CN202010229148.8A CN202010229148A CN113446155A CN 113446155 A CN113446155 A CN 113446155A CN 202010229148 A CN202010229148 A CN 202010229148A CN 113446155 A CN113446155 A CN 113446155A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/022—Adjusting aerodynamic properties of the blades
- F03D7/0236—Adjusting aerodynamic properties of the blades by changing the active surface of the wind engaging parts, e.g. reefing or furling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D17/00—Monitoring or testing of wind motors, e.g. diagnostics
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/04—Automatic control; Regulation
- F03D7/042—Automatic control; Regulation by means of an electrical or electronic controller
- F03D7/043—Automatic control; Regulation by means of an electrical or electronic controller characterised by the type of control logic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Wind Motors (AREA)
Abstract
The embodiment of the invention provides an operation control method of a wind generating set, a variable pitch controller and a variable pitch driver, wherein the wind method comprises the following steps: when the wind generating set is in the feathering process of the blades and the limit switches of the blades fail, the current variable pitch speed is adjusted to be a target speed, and the target speed is sent to a variable pitch driver, so that the variable pitch driver controls the 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 the 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. According to the embodiment of the invention, the problem of blade over-rotation caused by the failure of the limit switch can be avoided, and the safety of the wind generating set is ensured.
Description
Technical Field
The invention relates to the technical field of wind power generation, in particular to an operation control method of a wind generating set, a variable pitch controller and a variable pitch driver.
Background
The variable pitch system is an important functional component of the wind generating set, the variable pitch controller can control the variable pitch motor to feather the blades when the wind generating set is shut down, the blades are controlled to rotate towards the 90-degree direction, the limit switch is arranged on the rotating path of the blades, the limit switch can be triggered when the blades pass through the limit switch under normal conditions, and the variable pitch controller receives a trigger signal of the limit switch and then controls the variable pitch motor to stop working. However, the limit switch may fail in the use process, for example, problems such as position deviation or communication fault occur, so that the limit switch cannot be normally triggered when the blade passes through, the blade is excessively rotated, and finally, components of the wind turbine generator system are damaged.
Disclosure of Invention
The embodiment of the invention provides an operation control method of a wind generating set, a variable pitch controller and a variable pitch driver, which can avoid the problem of blade over-rotation caused by failure of a limit switch and ensure the safety of the wind generating set.
In a first aspect, an embodiment of the present invention provides an operation control method for a wind turbine generator system, where the method is used for a pitch controller, and the method includes:
when the wind generating set is in the feathering process of the blades and the limit switches of the blades fail, the current variable pitch speed is adjusted to be a target speed, and the target speed is sent to a variable pitch driver, so that the variable pitch driver controls the 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 the 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.
In one possible embodiment of the first aspect, before 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: and determining that the limit switch is invalid. Determining the failure of the limit switch specifically comprises: acquiring a trigger state of a limit switch and a trigger state of a proximity switch corresponding to the limit switch, wherein the 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 the first accumulated time 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.
In a possible implementation manner of the first aspect, 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, include: 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.
In one possible embodiment of the first aspect, before 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 the encoder does not have a transition fault. Determining that the encoder has no jump fault, specifically comprising: calculating the change rate of the blade angle of the first period relative to the second period to obtain a first change rate, wherein the second period is one or more periods located forward 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 plurality of deviations are all within a preset allowable range; and if the absolute values of the deviations are all within a preset allowable range, determining that the encoder has no jump fault.
In one possible implementation of the first aspect, adjusting the pitch speed from the current speed to the target speed comprises: setting a 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.
In a second aspect, an embodiment of the present invention provides an operation control method for a wind turbine generator system, where the method is used for a pitch drive, and includes:
receiving a simulation signal sent by a variable pitch controller, obtaining a variable pitch speed according to the simulation 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.
In a third aspect, an embodiment of the present invention provides a pitch controller, including:
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 the feathering process of the blades and the limit switches of the blades are invalid;
the first sending module is used for sending the target speed to the variable pitch driver so that the variable pitch driver controls the 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 the 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.
In a fourth aspect, an embodiment of the present invention provides a pitch drive, including:
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 the 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.
In a fifth aspect, an embodiment of the present invention provides an operation control system for a wind turbine generator system, including: a pitch controller as described above and a pitch drive as described above, the pitch controller being electrically connected to the pitch drive.
In one possible embodiment of the first aspect, the wind turbine generator system further includes: 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.
In a fifth aspect, embodiments of the present invention provide a computer-readable storage medium storing instructions that, when executed by at least one computing device, cause the computing device to perform the wind turbine generator set operation control method as described above.
According to the operation control method of the wind generating set in the embodiment of the invention, under the condition that the limit switch of the blade is invalid, on one hand, the variable pitch speed can be adjusted from the current speed to the target speed and the target speed is sent to the variable pitch driver, so that the variable pitch driver controls the variable pitch motor to stop working according to the target speed; on the other hand, a target control signal for switching the pitch control mode from the current mode to the manual mode can be generated and sent to the pitch control driver, so that the pitch control driver adjusts the pitch control mode from the current mode to the manual mode according to the target control signal, the problem of blade over-rotation caused by failure of the limit switch is avoided, and safety of the wind generating set is guaranteed.
Drawings
The present invention will be better understood from the following description of specific embodiments thereof taken in conjunction with the accompanying drawings, in which like or similar reference characters designate like or similar features.
FIG. 1 is a schematic diagram of structural components related to blade angle detection of a wind generating set;
FIG. 2 is a schematic flow chart of a method for controlling operation of a wind turbine generator system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the electrical connections of the pitch controller and the pitch drive provided by one embodiment of the present invention;
FIG. 4 is a schematic flow chart of a method for controlling the operation of a wind turbine generator system according to another embodiment of the present invention;
FIG. 5 is a schematic view of the electrical connections of a pitch controller and a pitch drive according to another embodiment of the invention;
fig. 6 is a schematic flow chart of a method for determining a limit switch failure according to an embodiment of the present invention;
fig. 7 is a schematic flowchart of a method for detecting a transition fault of an encoder according to an embodiment of the present invention;
FIG. 8 is a schematic flow chart illustrating a method for controlling operation of a wind turbine generator according to another embodiment of the present invention;
FIG. 9 is a schematic flow chart illustrating a method for controlling operation of a wind turbine generator according to still another embodiment of the present invention;
FIG. 10 is a schematic structural diagram of an operation control device of a wind turbine generator system according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of an operation control device of a wind turbine generator system according to another embodiment of the present invention;
fig. 12 is a schematic structural diagram of an operation control device of a wind turbine generator system according to still another embodiment of the present invention;
fig. 13 is a schematic structural diagram of an operation control device of a wind turbine generator system according to still another embodiment of the present invention.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be 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 operation control method of the wind generating set in the embodiment of the invention is used for a blade feathering scene. A communication line is arranged between a variable pitch controller and a variable pitch drive of a variable pitch system of the wind generating set, when normal feathering is carried out, the variable pitch controller sends a variable pitch speed set value to a variable pitch drive, the variable pitch speed set value can be in the form of an analog signal, and the variable pitch drive drives a variable pitch motor to work according to the variable pitch speed set value, so that blades continuously receive the pitch in the 90-degree direction until a limit switch is triggered.
Fig. 1 shows structural components related to wind turbine blade angle detection, including: the device comprises a speed reducer 101, a transmission wheel 102, a tension wheel 103, a tension wheel 104, a wheel hub 105, a toothed belt 106, a blade mounting device 107, a toothed belt fixing block 108, a toothed belt fixing block 109, a tension wheel fixing device 110, an 87-degree proximity switch 111, a stop 112, a 5-degree proximity switch 113, a bearing inner ring 114 and a 91-degree limit switch 115.
Wherein, the speed reducer 101 is engaged with a pitch motor (not shown in the figure). The transmission wheel 102 is mechanically connected to an output shaft of the speed reducer 101. The speed reducer 101 and the tension pulley fixing device 110 are both fixedly mounted on the hub 105. The tension pulley fixing device 110 is used to fix the tension pulley 103 and the tension pulley 104. The tensioning wheel 103 and the tensioning wheel 104 are used for tensioning the toothed belt 106 to ensure the reliability of the transmission. The 87 degree proximity switch 111, the 5 degree proximity switch 113, and the 91 degree limit switch 115 are mounted on the hub 105 and do not rotate with the blade, and the 87 degree proximity switch 111 is mounted at the 87 degree position of the blade, the 5 degree proximity switch 113 is mounted at the 5 degree position of the blade, and the 91 degree limit switch 115 is mounted at the 91 degree position of the blade. The stopper 112 is mounted on the blade mounting device 107 and can rotate with the blade mounting device 107, and the blade mounting device 107 specifically refers to a pitch bearing and a component connected with the pitch bearing.
In the feathering process of the blades, the stop block 112 rotates along with the blades, the 87-degree proximity switch 111 is triggered firstly, the 91-degree limit switch 115 is triggered after a period of time, at the moment, a hardware loop connected with the 91-degree limit switch 115 is disconnected, so that a signal input to an enabling end of the variable pitch driver is changed into a non-enabling signal, the variable pitch driver stops driving the variable pitch motor, and the blades stop feathering.
However, the limit switch may fail during the use process, for example, a position deviation or a communication fault occurs, so that the limit switch cannot be normally triggered when the blade passes through, the blade cannot stop running after reaching a safe position (for example, 91 degrees), mechanical components in the pitch system, such as a toothed belt, are pulled off, the mechanical components are damaged by collision, and the shutdown time and the maintenance time of the wind turbine generator set are prolonged, and the safe running of the wind turbine generator set is also affected in a severe case.
Based on this, an embodiment of the present invention provides an operation control method for a wind turbine generator system, where the operation control method is used for a pitch controller, and with reference to fig. 2, the operation control method for the wind turbine generator system includes the following steps:
step 201, when the wind generating set is in a blade feathering process and a limit switch of a blade fails, a pitch controller adjusts the current pitch speed to a target speed.
Specifically, the pitch controller can adjust the pitch speed from the current speed to the target speed according to the set information by setting the target flag position indicating the failure of the limit switch to the set information when the wind generating set is in the blade feathering process and the limit switch of the blade fails, wherein the target speed can be 0, so that hardware transformation is not needed, and the purpose can be realized by increasing the register flag position.
Step 202, the variable pitch controller sends the target speed to the variable pitch driver so that the variable pitch driver controls the variable pitch motor to stop working according to the target speed.
Referring to fig. 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 drive 304, through which the pitch controller 301 can send the target speed to the pitch drive 304.
In the operation control method of the wind generating set, the variable pitch controller adjusts the current variable pitch speed to 0 and sends the speed to the variable pitch driver under the condition that the wind generating set is in the blade feathering process and the limit switch of the blade fails, so that the variable pitch driver controls the variable pitch motor to stop working according to the speed, the blade stops feathering, the problem of blade over-rotation caused by the failure of the limit switch can be avoided, and the safety of the wind generating set is ensured.
The electrical connection of limit switch 305 and manual switch 306 is also shown in fig. 3. 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. Power supply 307 is used to provide electrical signals to the pitch system and pitch drive enable inputs.
Currently, pitch drive 304 enters the manual mode after manual switch 306 is triggered. The priority of the manual mode is higher than that of the automatic mode and the fault mode, and after the manual mode is entered, the variable pitch driver 304 does not execute the speed instruction issued by the variable pitch controller 301 any more, but stops driving the blades to change the pitch.
Also shown in FIG. 3 are two digital communication (DO-DI) lines connected between pitch controller 301 and pitch drive 304. One of the digital communication lines 302 is used for transmitting a forward pitch control signal, the forward pitch control is that the blade changes pitch in the direction of 0 degree, the other digital communication line 303 is used for transmitting a backward pitch control signal, and the backward pitch control is that the blade changes pitch in the direction of 90 degrees.
At present, only when a knob (not shown in the drawings) for changing the pitch forwards is triggered and a forward pitch signal 302 output by the pitch controller 301 is a high level signal, the pitch driver 304 drives the blade to change the pitch towards the 0-degree direction, or when a knob (not shown in the drawings) for changing the pitch backwards is triggered and a backward pitch signal 303 output by the pitch controller 301 is a high level signal, the pitch driver 304 drives the blade to change the pitch towards the 90-degree direction.
From the above analysis, it is clear that entering the manual mode by the pitch drive 304 also stops the blade feathering, but at present the pitch drive can only be entered into the manual mode by triggering the manual switch 306.
Based on the above, the embodiment of the invention also provides an operation control method of the wind generating set, which is used for the variable pitch controller. Referring to fig. 4, the operation control method of the wind generating set comprises the following steps:
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 a manual mode according to the target control signal.
Referring to FIG. 5, a digital communication line 501 is added between the pitch controller 301 and the pitch drive 304, and the digital communication line 501 may be used by the pitch controller 501 to send a target control signal to the pitch drive 304 indicating a switch of the pitch mode from the current mode to the manual mode.
In the operation control method of the wind generating set, the pitch controller generates a target control signal for switching the pitch mode from the current mode to the manual mode and sends the target control signal to the pitch driver when the wind generating set is in the blade feathering process and the limit switch of the blade fails, so that the pitch driver adjusts the current pitch mode to the manual mode according to the target control signal.
It should be noted that, in the two methods for stopping blade feathering given above, the method for adjusting the pitch speed by the pitch controller does not need to change the existing hardware, and the pitch controller can transmit the adjusted pitch speed to the pitch driver through the original communication line. And the pitch controller generates a mode of a control signal indicating switching the current pitch mode to the manual mode, and a communication line needs to be added for enabling the pitch controller to send the generated control signal to the pitch driver.
The method for determining the failure of the limit switch will be described in detail below. As shown in fig. 6, the method for determining the failure of the limit switch may include:
And the angle difference between the proximity switch and the limit switch is smaller than a 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. In the feathering process of the blades, the stop block 112 rotates along with the blades, the 87-degree approach switch 111 is triggered by the stop block 112 in the process of rotating along with the blades, and the 91-degree limit switch 115 is triggered after a period of time.
Wherein the first accumulated time period may be determined according to an angle difference between the proximity switch and the limit switch and the pitch speed. Under normal conditions, the limit switch can be triggered within the first accumulated time after the proximity switch is triggered, and if the limit switch is not triggered within the first accumulated time after the proximity switch is triggered, the limit switch is possible to fail, and the next step of judgment needs to be performed.
And step 604, if the angle of the blade is larger than the preset safety angle, determining that the limit switch is invalid.
After the limit switch fails, the pitch drive can continue to drive the blades to rotate in the direction larger than 90 degrees, and if the angle of the blades is larger than a preset safety angle, such as 100 degrees, the blades do not stop after passing through the limit switch, but continue to rotate, and at this time, it can be determined that the limit switch has failed.
The angle of the blade can be measured by an encoder, the encoder is installed on a rotating shaft of a variable pitch motor, under the condition of instable signal transmission, the angle of the blade measured by the encoder can jump temporarily to a larger value, and the angle of the blade returns to a normal value in the next second. In this case, if step 604 is continuously executed, the failure state of the limit switch may be erroneously determined, and therefore, in order to improve the accuracy of determining the failure state of the limit switch, it is necessary to ensure that there is no jump in the blade angle during execution of step 604.
In order to detect the blade angle measured by the encoder for jump detection, the inventor combines the detection principle of the encoder and the mechanical principle of blade rotation for analysis, and finds that:
firstly, the blade angle can be obtained by calculating the pulse number output by the encoder, and meanwhile, the blade angle is also the execution result of the variable pitch speed set value (variable pitch speed instruction) issued by the variable pitch motor to the variable pitch controller, so that the positive correlation exists between the blade angle measured by the encoder and the variable pitch speed set value.
And secondly, the rotating speed of the variable pitch motor can be calculated by the number of pulses output by the encoder in unit time, and meanwhile, the rotating speed of the variable pitch motor has positive correlation with voltage, so that the blade angle measured by the encoder and the voltage of the variable pitch motor also have positive correlation.
Therefore, positive correlation exists among the blade angle measured by the encoder, the given value of the variable pitch speed and the voltage of the variable pitch motor, and the jump detection can be performed on the blade angle measured by the encoder based on the positive correlation among the blade angle measured by the encoder, the given value of the variable pitch speed and the voltage of the variable pitch motor because the voltage of the variable pitch motor is relatively stable.
Referring to fig. 7, the method of determining that there is no transition fault of the encoder includes:
In this step, the first rate of change may be understood as a rate of change of the blade angle measured by the encoder. The first change rate may be a ratio of an 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 a ratio of the blade angle of the second period to the blade angle of the first period, which is not limited herein.
Step 702, calculating a ratio of a 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.
In this step, the second rate of change may be understood as a rate of change of the voltage of the pitch motor.
And 703, calculating a difference value 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.
Step 704, determine whether all of the absolute values of the plurality of deviations are within a preset allowable range.
Step 705, if the absolute values of the deviations are all within the preset allowable range, it is determined that the encoder has no jump fault.
Because the positive correlation exists among the blade angle measured by the encoder, the given variable pitch speed value and the voltage of the variable pitch motor, the first change rate, the second change rate and the change rate of the given speed command value issued by the variable pitch controller are equal under normal conditions. Correspondingly, if the absolute values of the plurality of deviations are all within the preset allowable range, the first change rate, the second change rate and the change rate of the speed command given value sent by the variable pitch controller are relatively close in value.
Considering that the voltage of the variable pitch motor is relatively stable, under the condition that the change rate of the voltage of the variable pitch motor, the change rate of the given value of the speed command issued by the variable pitch controller and the change rate of the blade angle are consistent, the change rate of the blade angle can be considered not to generate large jump, that is, the encoder can be determined not to have jump faults.
An embodiment of the present invention further provides an operation control method for a wind turbine generator system, where the operation control method is used for a pitch driver, and referring to fig. 8, the operation control method for the wind turbine generator system includes:
step 801, receiving an analog signal sent by a variable pitch controller;
and step 802, controlling the pitch variation motor to stop working when the pitch variation speed is the target speed.
Here, the target speed may be 0. In the embodiment, under the condition that the wind generating set is in the feathering process of the blades and the limit switches of the blades fail, the pitch-variable driver can control the pitch-variable motor to stop working according to the received target speed (0), so that the blades stop feathering, the problem of excessive rotation of the blades caused by the failure of the limit switches can be avoided, and the safety of the wind generating set is ensured.
An embodiment of the present invention further provides an operation control method for a wind turbine generator system, where the operation control method is used for a pitch driver, and referring to fig. 9, the operation control method for the wind turbine generator system includes:
step 901, receiving a control signal sent by a variable pitch controller;
and step 902, when the control signal is a target control signal indicating that the pitch mode is switched from the current mode to the manual mode, adjusting the current pitch mode to the manual mode.
In the embodiment, under the condition that the wind generating set is in the blade feathering process and the limit switch of the blade fails, the pitch driver can adjust the current pitch mode into the manual mode according to the received target control signal, so that the current pitch mode can be switched into the manual mode even if the manual switch does not need to be triggered, the aim of stopping the blade feathering is achieved, the problem of excessive rotation of the blade caused by the failure of the limit switch is avoided, and the safety of the wind generating set is ensured.
An embodiment of the present invention further provides a pitch controller, and referring to fig. 10, the pitch controller includes an adjusting module 1001 and a first sending module 1002.
The adjusting module 1001 is configured to adjust a current pitch variation speed to a target speed when the wind turbine generator system is in a blade feathering process and a limit switch of a blade is failed.
The first sending module 1002 is configured to send the target speed to the pitch drive, so that the pitch drive controls the pitch motor to stop working according to the target speed.
In this embodiment, the target speed may be 0, and the adjusting module of the pitch controller adjusts the current pitch speed to 0 and transmits the current pitch speed to the pitch driver through the first transmitting module under the condition that the wind turbine generator system is in the blade feathering process and the limit switch of the blade fails, so that the pitch driver controls the pitch motor to stop working according to the speed, and the blade stops feathering.
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 drive, so that the pitch drive adjusts the current pitch mode to a manual mode according to the target control signal.
In this embodiment, 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 transmits the target control signal to the pitch driver through the second transmission module under the condition that the wind generating set is in the blade feathering process and the limit switch of the blade fails, so that the pitch driver adjusts the current pitch mode to the manual mode according to the target control signal.
It should be noted that, in the pitch controller in the embodiment of the present invention, the adjusting module 1001, the first sending module 1002, the generating module 1101, and the second sending module 1102 may be integrated at the same time, or only the adjusting module 1001 and the first sending module are integrated, or only the generating module 1101 and the second sending module 1102 are integrated, which is not limited herein.
Embodiments of the present invention also provide a pitch drive, see fig. 12, comprising a first receiving module 1201 and a control module 1202.
The first receiving module 1201 is configured to receive an analog signal sent by a pitch controller.
The control module 1202 is configured to obtain a pitch variation speed according to the analog signal, and control the pitch variation motor to stop working when the pitch variation speed is a target speed. Wherein the target speed may be 0.
In the embodiment, under the condition that the wind generating set is in the feathering process of the blades and the limit switches of the blades fail, the control module of the pitch-variable driver can control the pitch-variable motor to stop working according to the target speed (0) received by the first receiving module, so that the blades stop feathering, the problem of excessive rotation of the blades caused by failure of the limit switches can be avoided, and the safety of the wind generating set is ensured.
An embodiment of the present invention also provides a pitch drive, see fig. 13, comprising a second receiving module 1301 and a switching module 1302.
The second receiving module 1301 is used for receiving a 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 the embodiment, under the condition that the wind generating set is in the blade feathering process and the limit switch of the blade fails, the switching module of the pitch-variable driver can adjust the current pitch-variable mode to the manual mode according to the target control signal received by the second receiving module, so that the current pitch-variable mode can be switched to the manual mode even if the manual switch does not need to be triggered, the aim of stopping the blade feathering is achieved, the problem of excessive rotation of the blade caused by the failure of the limit switch is avoided, and the safety of the wind generating set is ensured.
It should be noted that the pitch drive 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, or may be integrated with only the first receiving module 1201 and the control module 1202, or integrated with only the second receiving module 1301 and the switching module 1302, which is not limited herein.
The embodiment of the invention also provides a wind generating set operation control system, which comprises: a pitch controller as described above and a pitch drive as described above, the pitch controller being electrically connected to the pitch drive.
In some embodiments, the wind park operation control system further comprises a first communication line and a second communication line. Wherein a first communication line is arranged between the pitch controller and the pitch drive for transmitting an analogue signal representing the pitch speed (see AO-AI line in fig. 3); a second communication line is provided between the pitch controller and the pitch drive for transmitting control signals (see 501 in FIG. 5) indicative of the pitch mode switching operation.
Embodiments of the present invention also provide a computer-readable storage medium storing instructions that, when executed by at least one computing device, cause the computing device to execute the wind turbine generator system operation control method as described above; alternatively, the instructions, when executed by the at least one computing device, cause the computing device to perform the wind park operation control method as described above.
It should be clear that the embodiments in this specification are described in a progressive manner, and the same or similar parts in the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. For the device embodiments, reference may be made to the description of the method embodiments in the relevant part. Embodiments of the invention are not limited to the specific steps and structures described above and shown in the drawings. Those skilled in the art may make various changes, modifications and additions to, or change the order between the steps, after appreciating the spirit of the embodiments of the invention. Also, a detailed description of known process techniques is omitted herein for the sake of brevity.
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, plug-in, function card, or the like. When implemented in software, the elements of an embodiment of the invention are the 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 by a data signal carried in a carrier wave over a transmission medium or a communication link. A "machine-readable medium" may include any medium that can store or transfer information. Examples of a machine-readable medium 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 so forth. The code segments may be downloaded via computer networks such as the internet, intranet, etc.
Embodiments of the present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. For example, the algorithms described in the specific embodiments may be modified without departing from the basic spirit of the embodiments of the present invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the embodiments of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
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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| CN114333472A (en) * | 2021-12-24 | 2022-04-12 | 北京金风慧能技术有限公司 | Variable-pitch teaching system and control method, equipment and readable storage medium thereof |
| CN114645819A (en) * | 2022-05-19 | 2022-06-21 | 东方电气风电股份有限公司 | Wind power variable pitch control method, device and system and storage medium |
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| CN113446155B (en) | 2022-07-05 |
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