CN110552837A - Shutdown control method and device for wind turbine generator with flexible tower and wind turbine generator - Google Patents
Shutdown control method and device for wind turbine generator with flexible tower and wind turbine generator Download PDFInfo
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- CN110552837A CN110552837A CN201910659460.8A CN201910659460A CN110552837A CN 110552837 A CN110552837 A CN 110552837A CN 201910659460 A CN201910659460 A CN 201910659460A CN 110552837 A CN110552837 A CN 110552837A
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000012544 monitoring process Methods 0.000 claims abstract description 18
- 230000007246 mechanism Effects 0.000 claims abstract description 8
- 230000003111 delayed effect Effects 0.000 claims description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims 1
- 235000017491 Bambusa tulda Nutrition 0.000 claims 1
- 241001330002 Bambuseae Species 0.000 claims 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims 1
- 239000011425 bamboo Substances 0.000 claims 1
- 238000013016 damping Methods 0.000 description 9
- 238000004590 computer program Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 3
- 230000002238 attenuated effect Effects 0.000 description 2
- 238000013017 mechanical damping Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000644 propagated effect Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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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
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2270/00—Control
- F05B2270/30—Control parameters, e.g. input parameters
- F05B2270/328—Blade pitch angle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2270/00—Control
- F05B2270/30—Control parameters, e.g. input parameters
- F05B2270/334—Vibration measurements
-
- 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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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Wind Motors (AREA)
Abstract
The invention provides a shutdown control method and device for a wind turbine generator with a flexible tower and a wind turbine generator. The method comprises the following steps: after the wind turbine generator starts to execute a shutdown instruction, a variable pitch instruction with a phase opposite to the vibration of the engine room is sent to a variable pitch mechanism; and monitoring the vibration of the cabin in real time, and stopping the execution of the pitch control instruction when the real-time vibration value of the cabin is smaller than a set vibration value. The shutdown control method and device for the wind turbine generator with the flexible tower and the wind turbine generator can effectively reduce the shutdown load of the wind turbine generator and improve the running safety of the flexible tower under the condition of not increasing the cost of the wind turbine generator.
Description
Technical Field
the invention relates to the technical field of wind power generation, in particular to a shutdown control method and device for a flexible tower drum wind turbine generator and a wind turbine generator.
Background
with the continuous deep development of wind power in China, the wind power installation machines in high wind speed areas tend to be saturated, in order to adapt to wind resource areas with lower wind speeds, various wind turbine manufacturers continuously increase the height of a tower to increase the wind speed of a wind turbine operation area, and the height of the wind turbine is gradually increased from 80 meters to 90 meters and 100 meters.
At present, the height of a tower drum of 100 meters is the height bottleneck of a conventional wind turbine generator and the height limit of a rigid tower drum, and the natural frequency of the tower drum of 100 meters or less is greater than 0.29Hz, the rated rotating speed of the wind turbine generator is about 0.25Hz, the rated rotating speed frequency is lower than the natural frequency of the tower drum, so the wind turbine generator is called as the rigid tower drum in the wind power industry. Otherwise, the rated rotating speed frequency is higher than the natural frequency of the tower, and the wind power industry refers to the flexible tower. Because the height of the flexible tower barrel is higher, and the operating frequency must coincide with the natural frequency of the tower barrel to generate resonance, a resonance crossing program is added in the control process of the flexible tower, the operating time of the unit in a resonance area is strictly controlled, and the operation safety of the flexible tower is ensured.
But in actual running tests it was found that: after the unit is shut down, as the height of the tower barrel is higher, the damping of the tower barrel is smaller, the free vibration attenuation time of the unit is longer, and larger fatigue load is brought to the unit. Approximately 150 seconds after the rigid tower is shut down, the unit vibration can be attenuated to a normal amplitude, while the attenuation time of the flexible tower is increased to 500 seconds. In order to reduce the vibration attenuation time, most manufacturers add an additional mass damping system to the unit, but because the tower has a large self weight (more than 120 tons) firstly, and the second tower does not have enough space inside to add the mass damping system, the actually installed mass damping system plays a very weak role.
disclosure of Invention
The invention aims to solve the technical problem of providing a shutdown control method and device for a wind turbine generator with a flexible tower and the wind turbine generator, so that the shutdown load of the wind turbine generator can be effectively reduced and the running safety of the flexible tower can be improved under the condition of not increasing the cost of the wind turbine generator.
in order to solve the technical problem, the invention provides a shutdown control method for a flexible tower drum wind turbine generator, which comprises the following steps: after the wind turbine generator starts to execute a shutdown instruction, a variable pitch instruction with a phase opposite to the vibration of the engine room is sent to a variable pitch mechanism; and monitoring the vibration of the cabin in real time, and stopping the execution of the pitch control instruction when the real-time vibration value of the cabin is smaller than a set vibration value.
In some embodiments, the pitch command has the same frequency as the natural frequency of the nacelle vibration.
In some embodiments, before sending a pitch instruction with a phase opposite to that of the vibration of the nacelle to the pitch mechanism, after obtaining the shutdown instruction of the wind turbine, the method further includes: monitoring a natural frequency of the nacelle vibration.
In some embodiments, monitoring the natural frequency of the nacelle vibration comprises: after a shutdown instruction is obtained, monitoring a first peak value of cabin vibration, and recording the time when the first peak value is monitored; monitoring a second peak value of the vibration of the cabin, and recording the time when the second peak value is monitored; determining a natural frequency of the nacelle vibration based on a time at which the first peak is detected and a time at which the second peak is detected.
In some embodiments, determining the natural frequency of the nacelle vibration based on the time at which the first peak is detected and the time at which the second peak is detected comprises: calculating the natural frequency of the nacelle vibration according to the following formula:
Where t 2 represents the time when the first peak was detected and t 3 represents the time when the second peak was detected.
In some embodiments, the pitch command has a peak to peak value of 4 °.
in some embodiments, the sending time of the pitch instruction is: the first zero crossing point after the second peak value is delayed by a set time.
in some embodiments, the set time for the delay is 0.5 seconds.
In addition, the invention also provides a shutdown control device of the flexible tower drum wind turbine generator, which comprises: one or more processors; the storage device is used for storing one or more programs, and when the one or more programs are executed by the one or more processors, the one or more processors implement the flexible tower wind turbine generator shutdown control device according to the foregoing description.
In addition, the invention also provides a wind turbine generator, which comprises the flexible tower drum wind turbine generator shutdown control device.
after adopting such design, the invention has at least the following advantages:
Due to the difference between the flexible tower unit and the rigid tower unit, the fatigue load of the flexible tower can be increased by using the original shutdown method.
Drawings
The foregoing is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and the detailed description.
FIG. 1 is a flowchart of a shutdown control method for a wind turbine generator with a flexible tower according to an embodiment of the present invention;
FIG. 2 is a flowchart of a shutdown control method for a wind turbine generator with a flexible tower according to an embodiment of the present invention;
FIG. 3 is a graphical illustration of the vibration acceleration of the nacelle provided by an embodiment of the present invention;
FIG. 4 is a pitch angle curve comparison graph provided by an embodiment of the present invention;
FIG. 5 is a shutdown pitch angle position map provided by an embodiment of the present invention;
Fig. 6 is a structural diagram of a shutdown control device for a flexible tower wind turbine generator according to an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
fig. 1 shows a flowchart of a shutdown control method for a flexible tower wind turbine generator provided by an embodiment of the invention. Referring to fig. 1, the shutdown control method of the flexible tower wind turbine generator includes:
s11, monitoring the natural frequency of the cabin vibration.
In an embodiment of the invention, the monitoring of the natural frequency of the nacelle vibrations starts after the start of the shutdown action. Typically, the monitoring actions for the natural frequency include: after a shutdown instruction is obtained, monitoring a first peak value of cabin vibration, and recording the time when the first peak value is monitored; monitoring a second peak value of the vibration of the cabin, and recording the time when the second peak value is monitored; determining a natural frequency of the nacelle vibration based on a time at which the first peak is detected and a time at which the second peak is detected.
Specifically, the natural frequency of the nacelle vibration is calculated according to the following formula:
where t 2 represents the time when the first peak was detected and t 3 represents the time when the second peak was detected.
and S12, after the wind turbine generator starts to execute the stop command, sending a pitch command with a phase opposite to the vibration of the nacelle to the pitch mechanism.
The pitch command has the same frequency as the natural frequency of the nacelle vibration. And the phase of the pitch command is opposite to the phase of the real-time nacelle vibration. Just because the phase of the superimposed pitch control instruction is opposite to the phase of the real-time cabin vibration, the pitch control instruction increases the aerodynamic damping for the vibration of the cabin. That is, the nacelle is enabled to effectively reduce the shutdown load without adding an additional mechanical damping mechanism, and the attenuation time of the shutdown process is greatly reduced.
Typically, the pitch command corresponds to a peak-to-peak value of 4 °.
And S13, monitoring the vibration of the cabin in real time, and stopping the execution of the pitch control instruction when the real-time vibration value of the cabin is smaller than the set vibration value.
When the real-time cabin vibration value is smaller than the preset vibration value threshold value, the shutdown action is finished, and the execution of the variable pitch instruction can be stopped.
Because the pitch control instruction with the phase opposite to the vibration phase of the cabin is superposed in the shutdown process, additional aerodynamic damping is added in the shutdown process. Therefore, the vibration of the cabin in the shutdown process can be quickly attenuated on the premise of not increasing an additional mechanical damping mechanism, and the shutdown attenuation time is greatly shortened.
fig. 2 shows a flowchart of a shutdown control method for a flexible tower wind turbine generator provided by the embodiment of the invention. Referring to fig. 2, the shutdown control method of the flexible tower wind turbine generator includes:
S21, as shown in fig. 1 below, when the wind turbine generator (hereinafter referred to as a generator) is in a fault or is normally shut down, the master control system records time t 1 of triggering shutdown, and at the same time, the master control PLC records a vibration value at the time of triggering shutdown, and finds out a 1 st vibration peak time as t 2 and a 2 nd vibration peak time as t 3.
S22, because the tower shutdown vibration is basically the natural vibration of the tower, the vibration waveform is simple, and as can be seen from fig. 3, the tower vibration period T is 2 × (T 3 -T 2), and thus the vibration frequency f of the tower at this time can be calculated to be 1/T.
And S23, according to the frequency f calculated by the second calculation, superposing a pitch instruction with the peak-to-peak value of 4 degrees and the frequency f and the phase opposite to the vibration phase of the cabin on the normal pitch instruction, as shown in FIG. 4, in order to ensure that the instruction of the pitch executing action is opposite to the vibration phase of the cabin, the response delay time of a superposed pitch system is required to be about 0.5 second, and as shown in FIG. 5, the sending time of the pitch instruction is (t 4 -0.5) second.
And S24, adding the pneumatic damping to quickly attenuate the stop free vibration of the unit, performing the variable-pitch pneumatic damping, monitoring the vibration value of the cabin in real time by the master control, and performing the superposition of the variable-pitch pneumatic damping when the vibration value of the cabin in real time is less than the set vibration value.
FIG. 6 shows a structure diagram of the shutdown control device of the flexible tower wind turbine generator set. Referring to fig. 6, the shutdown control device for the flexible tower wind turbine generator comprises: a Central Processing Unit (CPU)601, which can perform various appropriate actions and processes according to a program stored in a Read Only Memory (ROM) or a program loaded from a storage section 608 into a Random Access Memory (RAM) 603. In the RAM603, various programs and data necessary for system operation are also stored. The CPU 601, ROM 602, and RAM603 are connected to each other via a bus 604. An input/output (I/O) interface 605 is also connected to bus 604.
The following components are connected to the I/O interface 605: an input portion 606 including a keyboard, a mouse, and the like; an output portion 607 including a display such as a Cathode Ray Tube (CRT), a Liquid Crystal Display (LCD), and the like, and a speaker; a storage section 608 including a hard disk and the like; and a communication section 609 including a network interface card such as a LAN card, a modem, or the like. The communication section 609 performs communication processing via a network such as the internet. The driver 610 is also connected to the I/O interface 605 as needed. A removable medium 611 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is mounted on the drive 610 as necessary, so that a computer program read out therefrom is mounted in the storage section 608 as necessary.
In particular, according to an embodiment of the present invention, the processes described above with reference to the flowcharts may be implemented as computer software programs. For example, embodiments of the invention include a computer program product comprising a computer program embodied on a computer-readable medium, the computer program comprising program code for performing the method illustrated in the flow chart. In such an embodiment, the computer program may be downloaded and installed from a network through the communication section 609, and/or installed from the removable medium 611. The computer program performs the above-described functions defined in the method of the present invention when executed by a Central Processing Unit (CPU) 601. Note that the computer-readable medium of the present invention can be a computer-readable signal medium or a computer-readable storage medium or any combination of the two. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples of the computer readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the present invention, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. In the present invention, however, a computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, fiber optic cable, RF, etc., or any suitable combination of the foregoing.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention in any way, and it will be apparent to those skilled in the art that the above description of the present invention can be applied to various modifications, equivalent variations or modifications without departing from the spirit and scope of the present invention.
Claims (10)
1. A shutdown control method for a flexible tower drum wind turbine generator is characterized by comprising the following steps:
After the wind turbine generator starts to execute a shutdown instruction, a variable pitch instruction with a phase opposite to the vibration of the engine room is sent to a variable pitch mechanism;
And monitoring the vibration of the cabin in real time, and stopping the execution of the pitch control instruction when the real-time vibration value of the cabin is smaller than a set vibration value.
2. The method for controlling shutdown of a flexible tower wind turbine according to claim 1, wherein the pitch command has a frequency that is the same as a natural frequency of a nacelle vibration.
3. The method for controlling the shutdown of the wind turbine generator with the flexible tower according to claim 2, wherein before the step of obtaining the shutdown instruction of the wind turbine generator before the step of sending the pitch control instruction with the phase opposite to the vibration of the nacelle to the pitch control mechanism, the method further comprises the following steps:
monitoring a natural frequency of the nacelle vibration.
4. The method for controlling shutdown of a flexible tower wind turbine according to claim 3, wherein monitoring the natural frequency of the nacelle vibration includes:
after a shutdown instruction is obtained, monitoring a first peak value of cabin vibration, and recording the time when the first peak value is monitored;
Monitoring a second peak value of the vibration of the cabin, and recording the time when the second peak value is monitored;
Determining a natural frequency of the nacelle vibration based on a time at which the first peak is detected and a time at which the second peak is detected.
5. the method for controlling shutdown of a wind turbine generator according to claim 4, wherein determining the natural frequency of the nacelle vibration based on the time at which the first peak is detected and the time at which the second peak is detected comprises:
calculating the natural frequency of the nacelle vibration according to the following formula:
Where t 2 represents the time when the first peak was detected and t 3 represents the time when the second peak was detected.
6. The method for controlling shutdown of a flexible tower wind turbine according to claim 1, wherein a peak-to-peak value of the pitch instruction is 4 °.
7. the method for controlling the shutdown of the wind turbine generator with the flexible tower according to claim 4, wherein the moment of sending the pitch control command is as follows: the first zero crossing point after the second peak value is delayed by a set time.
8. The method for controlling shutdown of a flexible tower wind turbine according to claim 7, wherein the set time of the delay is 0.5 seconds.
9. The utility model provides a flexible tower section of thick bamboo wind turbine generator system stop control device which characterized in that includes:
One or more processors;
A storage device for storing one or more programs,
when executed by the one or more processors, cause the one or more processors to implement the flexible tower wind turbine generator shutdown control apparatus of any one of claims 1 to 8.
10. A wind turbine, comprising: the flexible tower wind turbine shutdown control apparatus as claimed in claim 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910659460.8A CN110552837A (en) | 2019-07-22 | 2019-07-22 | Shutdown control method and device for wind turbine generator with flexible tower and wind turbine generator |
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| CN201910659460.8A CN110552837A (en) | 2019-07-22 | 2019-07-22 | Shutdown control method and device for wind turbine generator with flexible tower and wind turbine generator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112096566A (en) * | 2020-08-27 | 2020-12-18 | 上海扩博智能技术有限公司 | Method, system, equipment and medium for acquiring shutdown state parameters of fan |
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| CN112096566A (en) * | 2020-08-27 | 2020-12-18 | 上海扩博智能技术有限公司 | Method, system, equipment and medium for acquiring shutdown state parameters of fan |
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Application publication date: 20191210 |
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