CN113606098A - Method and system for detecting aerodynamic abnormality of blades of wind turbine generator and storage medium - Google Patents
Method and system for detecting aerodynamic abnormality of blades of wind turbine generator and storage medium Download PDFInfo
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- CN113606098A CN113606098A CN202110970980.8A CN202110970980A CN113606098A CN 113606098 A CN113606098 A CN 113606098A CN 202110970980 A CN202110970980 A CN 202110970980A CN 113606098 A CN113606098 A CN 113606098A
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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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- 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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Abstract
The application relates to the application and provides a method for detecting aerodynamic abnormality of blades of a wind turbine generator, which relates to the technical field of wind power generation and comprises the following steps: acquiring voltage fluctuation frequency of direct-current bus voltage of a variable pitch motor driver; judging whether the voltage fluctuation frequency is abnormal or not based on a preset fluctuation frequency threshold, if so, acquiring the movement speed of the variable pitch motor, and if not, continuously acquiring the voltage fluctuation frequency; if the movement speed is greater than a preset movement speed threshold value, judging that the blade is normal in pneumatic operation; and if the movement speed is less than or equal to a preset movement speed threshold value, judging that the blade is abnormal in pneumatic operation. The method and the device have the effect of timely detecting whether the blade generates pneumatic abnormity under various external environments.
Description
Technical Field
The application relates to the technical field of wind power generation, in particular to a method, a system, a terminal and a storage medium for detecting aerodynamic abnormality of blades of a wind turbine generator.
Background
Three blades of the wind generating set are easily affected by icing and the like to cause wing profile change, so that pneumatic abnormity of the blades is caused, the generating efficiency and the safety of the wind generating set are further affected, potential safety operating hazards are brought, and serious accidents such as blade breakage and the like are caused in severe cases.
In the industry, whether blades of a unit are in a normal working state or not is judged according to a designed power curve by comparing the relation between the wind speed, the pitch angle of the blades, the rotating speed and the generated power, and a fan is controlled to enter a protection mode of pneumatic abnormity of the blades, so that the safety of unit equipment is protected.
In view of the above related technologies, the inventor believes that, in the case of strong wind, because the unit operates in a constant power region, the wind speed is higher than the rated wind speed, the power of the unit is in a full-blown state, and at this time, it is difficult to judge whether the blade is in an abnormal state through a power curve, and the aerodynamic abnormality of the blade cannot be detected in time, so that the unit operates with a fault, and the blade and other equipment are directly damaged in a severe case.
Disclosure of Invention
In order to timely detect whether the blade generates the pneumatic abnormity in various external environments, the application provides a method and a system for detecting the pneumatic abnormity of the blade of the wind turbine generator and a storage medium.
In a first aspect, the application provides a method for detecting aerodynamic anomaly of a wind turbine blade, which adopts the following technical scheme:
a method for detecting aerodynamic abnormality of blades of a wind turbine generator comprises the following steps:
acquiring voltage fluctuation frequency of direct-current bus voltage of a variable pitch motor driver;
judging whether the voltage fluctuation frequency is abnormal or not based on a preset fluctuation frequency threshold, if so, acquiring the movement speed of the variable pitch motor, and if not, continuously acquiring the voltage fluctuation frequency;
if the movement speed is larger than a preset movement speed threshold value, determining that the blade is normal in pneumatic operation;
and if the movement speed is less than or equal to a preset movement speed threshold value, determining that the blade is in pneumatic abnormity.
By adopting the technical scheme, the voltage fluctuation frequency of the direct-current bus voltage of the variable pitch motor driver is obtained, the voltage fluctuation frequency is compared with a preset fluctuation frequency threshold value, the factor influencing the voltage fluctuation frequency of the direct-current bus voltage of the variable pitch motor driver is overlarge movement speed of the variable pitch motor or abnormal blade aerodynamics, if the voltage fluctuation frequency is abnormal, the movement speed of the variable pitch motor at the moment is obtained, if the movement speed of the variable pitch motor is smaller than the preset movement speed threshold value of the variable pitch motor, namely, the movement speed of the variable pitch motor is normal, the abnormal blade aerodynamics can be determined, and the method can timely detect whether the blade generates the abnormal blade aerodynamics under various external environments, is not influenced by unit power, does not need to add any external equipment, and is convenient.
Optionally, the obtaining of the bus voltage fluctuation frequency of the pitch motor includes the following steps:
acquiring bus voltage and corresponding time information in real time, wherein the bus voltage is direct-current bus voltage of a variable pitch motor driver;
and acquiring the voltage fluctuation frequency based on the bus voltage and corresponding time information.
By adopting the technical scheme, the voltage fluctuation frequency can be calculated by collecting the bus voltage and the corresponding time information.
Optionally, obtaining the bus voltage fluctuation frequency based on the bus voltage and the corresponding time information includes the following steps:
determining a bus voltage threshold range, and determining that the bus voltage fluctuates once when the bus voltage exceeds the bus voltage threshold range and returns to the bus voltage threshold range within a certain time;
and setting a time region, and counting the number of times of fluctuation of the bus voltage in the time region to obtain the voltage fluctuation frequency.
By adopting the technical scheme, the bus voltage threshold range is determined, so that the condition of fluctuation is determined, and the bus voltage fluctuation times and the voltage fluctuation frequency can be scientifically acquired.
Optionally, the step of determining whether the voltage fluctuation frequency is abnormal based on a preset fluctuation frequency threshold, if so, acquiring a motion speed of the pitch motor, and if not, continuously acquiring the voltage fluctuation frequency includes the following steps:
if the bus voltage fluctuation frequency is larger than or equal to a preset fluctuation frequency threshold value, determining that the bus voltage fluctuation is abnormal, and then obtaining the movement speed of the variable pitch motor;
and if the bus voltage fluctuation frequency is smaller than a preset fluctuation frequency threshold value, determining that the bus voltage fluctuation is normal, and continuously acquiring the bus voltage fluctuation frequency of the variable pitch motor.
By adopting the technical scheme, the result of whether the voltage fluctuation frequency is abnormal or not is obtained by comparing the voltage fluctuation frequency with the preset fluctuation frequency threshold.
Optionally, if the moving speed is less than or equal to a preset moving speed threshold, after it is determined that the blade is aerodynamically abnormal, the method further includes:
sending out an alarm signal;
and starting a protection control mode of the pneumatic abnormity of the blade.
By adopting the technical scheme, after the pneumatic abnormity of the blades is determined, the alarm signal is sent out, a worker can be reminded to timely perform corresponding processing, and the wind turbine generator can be protected by the protection control mode of the pneumatic abnormity of the pneumatic blades, so that the loss is reduced, and the safety is improved.
In a second aspect, the application provides a system for detecting aerodynamic abnormality of a wind turbine blade, which adopts the following technical scheme:
a wind turbine blade aerodynamic anomaly detection system comprises:
the first acquisition module is used for acquiring the voltage fluctuation frequency of the direct-current bus voltage of the variable pitch motor driver;
the fluctuation frequency judgment module is connected with the first acquisition module and used for receiving the voltage fluctuation frequency acquired by the first acquisition module, judging whether the voltage fluctuation frequency is abnormal or not and outputting a judgment result;
the second acquisition module is used for acquiring the movement speed of the variable pitch motor;
the movement speed detection module is connected with the second acquisition module and used for judging whether the movement speed is in a high-speed state or a low-speed state and outputting a judgment result;
and the processing module is used for detecting whether the blade aerodynamics is abnormal or not based on the judgment result of the fluctuation frequency judgment module and the detection result of the movement speed detection module.
By adopting the technical scheme, after the first acquisition module acquires the voltage fluctuation frequency, the fluctuation frequency judgment module judges whether the voltage fluctuation frequency is abnormal, and the reason for causing the abnormal voltage fluctuation frequency is that the movement speed of the variable pitch motor is overlarge or the blade is abnormal pneumatically, so that whether the blade is abnormal pneumatically can be judged according to the movement speed of the variable pitch motor acquired by the second acquisition module. When the voltage fluctuation frequency is abnormal and the movement speed detection module detects that the movement speed of the variable pitch motor is in a low-speed state, the processing module determines that the blade is in pneumatic abnormity. The system can timely detect whether the blade generates pneumatic abnormity in various external environments, is not influenced by the power of the unit, does not add any external equipment, and is convenient.
Optionally, the first obtaining module includes:
the system comprises a first acquisition unit, a second acquisition unit and a control unit, wherein the first acquisition unit is used for real-time bus voltage and corresponding time information, and the bus voltage is the direct-current bus voltage of a variable pitch motor driver;
the bus voltage detection device comprises a first threshold unit, a second threshold unit and a control unit, wherein a bus voltage threshold is stored in the first threshold unit;
and the first calculating unit is used for counting the fluctuation times of the bus voltage in a preset time period and acquiring the voltage fluctuation frequency.
By adopting the technical scheme, after the first acquisition unit acquires the bus voltage and the corresponding time information, the calculation unit acquires the voltage fluctuation frequency according to the bus voltage threshold value, so that the data is normalized, and the fluctuation of the bus voltage can be captured in real time.
Optionally, the fluctuation frequency determining module includes:
a second threshold unit, wherein a fluctuation frequency threshold is preset in the second threshold unit;
and the judging unit is used for comparing the voltage fluctuation frequency with the fluctuation frequency threshold, determining that the bus voltage fluctuation is abnormal if the voltage fluctuation frequency exceeds the fluctuation frequency threshold, and determining that the bus voltage fluctuation is normal if the voltage fluctuation frequency does not exceed the fluctuation frequency threshold.
By adopting the technical scheme, the judgment unit compares the real-time voltage fluctuation frequency with the fluctuation frequency threshold value in the second threshold value unit, and can quickly judge whether the voltage fluctuation frequency is abnormal or not.
Optionally, the processing module includes:
the processing unit is used for detecting whether the blade aerodynamics is abnormal or not based on the judgment result of the fluctuation frequency judgment module and the detection result of the movement speed detection module;
the alarm unit is used for sending abnormal information to the alarm unit when the processing unit determines that the blade is abnormal in pneumatic state, and the alarm unit is used for sending an alarm signal;
and the adjusting unit is connected with the alarm unit, and after the alarm unit sends an alarm signal, the adjusting unit controls the wind turbine generator to enter a protection control mode of pneumatic abnormity of the blades.
By adopting the technical scheme, after the processing unit determines that the blades are in pneumatic abnormity, the alarm unit gives an alarm to remind a worker to perform corresponding processing, and the adjusting unit controls the wind turbine generator to enter a protection control mode of the pneumatic abnormity of the blades to protect the wind turbine generator and reduce loss.
In a third aspect, the present application provides a computer-readable storage medium, which adopts the following technical solutions:
a computer readable storage medium stores a computer program, and when the computer program is loaded and executed by a processor, the method for detecting the aerodynamic abnormality of the blades of the wind turbine generator is adopted.
By adopting the technical scheme, the wind turbine blade aerodynamic anomaly detection method generates a computer program, the computer program is stored in a computer readable storage medium to be loaded and executed by a processor, and the computer program can be conveniently read and stored through the computer readable storage medium.
Drawings
Fig. 1 is a schematic overall structure diagram of a method for detecting aerodynamic abnormality of a wind turbine blade according to an embodiment of the present application.
Fig. 2 is a schematic structural diagram of step S100 in a method for detecting aerodynamic abnormality of a wind turbine blade according to an embodiment of the present application.
Fig. 3 is a schematic structural diagram of step S120 in a method for detecting aerodynamic abnormality of a wind turbine blade according to an embodiment of the present application.
Fig. 4 is a schematic structural diagram of step S200 in a method for detecting aerodynamic abnormality of a wind turbine blade according to an embodiment of the present application.
Fig. 5 is a schematic structural diagram of steps S410 to S420 in a method for detecting aerodynamic abnormality of a wind turbine blade according to an embodiment of the present application.
Fig. 6 is a schematic structural diagram of an overall framework of a system for detecting aerodynamic abnormality of a wind turbine blade according to an embodiment of the present application.
Description of reference numerals:
1. a first acquisition module; 11. a first acquisition unit; 12. a first threshold unit; 13. a calculation unit; 2. a fluctuation frequency judgment module; 21. a second threshold unit; 22. a judgment unit; 3. a second acquisition module; 4. a motion speed detection module; 41. a third threshold unit; 42. a detection unit; 5. a processing module; 51. a processing unit; 52. an alarm unit; 53. and an adjusting unit.
Detailed Description
The present application is described in further detail below with reference to figures 1-6.
The reason for causing the voltage fluctuation of the direct current bus of the variable pitch motor driver is as follows:
1. the movement speed of the variable pitch motor is overlarge;
2. the pneumatic abnormality of the blades of the variable pitch motor,
therefore, by acquiring the direct-current bus voltage of the variable pitch motor driver in real time, when the direct-current bus voltage fluctuation of the variable pitch motor driver is abnormal, whether the blade aerodynamics of the variable pitch motor is abnormal can be known by detecting whether the movement speed of the variable pitch motor is overlarge.
The embodiment of the application discloses a method for detecting aerodynamic abnormality of blades of a wind turbine generator, which comprises the following steps of:
s100, acquiring voltage fluctuation frequency of direct-current bus voltage of a variable pitch motor driver;
s200, judging whether the voltage fluctuation frequency is abnormal or not based on a preset fluctuation frequency threshold, if so, acquiring the movement speed of the variable pitch motor, and if not, continuously acquiring the voltage fluctuation frequency;
s300, if the movement speed is larger than a preset movement speed threshold value, determining that the blade is normal in pneumatic operation;
s400, if the movement speed is smaller than or equal to a preset movement speed threshold value, determining that the blade is in pneumatic abnormity.
Referring to fig. 2, step S100 includes the following steps:
s110, acquiring bus voltage and corresponding time information in real time, wherein the bus voltage is the direct-current bus voltage of a variable pitch motor driver;
and S120, acquiring the voltage fluctuation frequency based on the bus voltage and the corresponding time information.
Specifically, in step S110, the dc bus voltage of the servo driver of the pitch motor is measured in real time by the controller, and the bus voltage data corresponding to the time is recorded, where the recorded data is: at the nth millisecond, the dc bus voltage of the pitch motor servo driver is M volts, for example, at 500ms, the dc bus voltage of the pitch motor servo driver is 530V.
Specifically, referring to fig. 3, step S120 includes the following steps:
s121, determining a bus voltage threshold range, and determining that the bus voltage fluctuates once when the bus voltage exceeds the bus voltage threshold range and returns to the bus voltage threshold range within a certain time;
and S122, setting a time region, counting the number of times of fluctuation of the bus voltage in the time region, and acquiring the voltage fluctuation frequency.
More specifically, in step S121, for example, the bus voltage threshold range is set to be 500V-600V, i.e. the bus voltage range is normally 500V-600V, and in this embodiment, when the bus voltage exceeds 600V and returns to the bus voltage threshold range within 300ms, the primary fluctuation is recorded.
More specifically, in step S122, a time zone is set, for example, 500ms is set as the time zone, the number of times of fluctuation of the bus voltage in 500ms is counted, and a bus voltage fluctuation frequency is obtained according to the number of times, and the voltage fluctuation frequency = the number of times of fluctuation of the bus voltage/500 ms.
Referring to fig. 4, step S200 includes the following steps:
s210, if the voltage fluctuation frequency is larger than or equal to a preset fluctuation frequency threshold value, determining that the bus voltage fluctuation is abnormal, and then acquiring the movement speed of a variable pitch motor;
s220, if the voltage fluctuation frequency is smaller than a preset fluctuation frequency threshold value, determining that the bus voltage fluctuation is normal, and continuously acquiring the voltage fluctuation frequency of the variable pitch motor.
Specifically, a fluctuation frequency threshold value is preset, and whether the bus voltage frequency exceeds the fluctuation frequency threshold value is judged. The fluctuation frequency threshold is set to F, and in the present embodiment, F =2 times/500 ms is set.
If the voltage fluctuation frequency is greater than or equal to 2 times/500 ms, for example, the voltage fluctuation frequency is equal to 3 times/500 ms, determining that the bus voltage fluctuation is abnormal, and at the moment, acquiring the movement speed of the variable pitch motor;
if the voltage fluctuation frequency is less than 2 times/500 ms, for example, the voltage fluctuation frequency is equal to 0 times/500 ms, the bus voltage fluctuation is determined to be normal, and at this time, the voltage fluctuation frequency is continuously acquired.
In steps S300 to S400, a movement speed threshold of the pitch motor is preset, and when the bus voltage fluctuation is abnormal, whether the movement speed of the pitch motor is greater than the movement speed threshold is determined; and if the movement speed of the variable pitch motor is less than or equal to the movement speed threshold, determining that the bus voltage fluctuation abnormity is caused by blade aerodynamic abnormity.
Specifically, the movement speed of the pitch motor is set as W, and in the present embodiment, W = pi/60 (unit: rad/s) is set, that is, the pitch motor rotates 3 ° per second as the movement speed threshold.
When the bus voltage is abnormal and the movement speed of the variable pitch motor is greater than pi/60 (unit: rad/s), determining that the blade is in pneumatic abnormity;
and when the bus voltage is abnormal and the movement speed of the variable pitch motor is less than or equal to pi/60 (unit: rad/s), determining that the blade is normal in pneumatics.
Referring to fig. 5, after step S400, the following steps are also included:
s410, sending out an alarm signal;
and S420, starting a protection control mode of the pneumatic abnormity of the blade.
Specifically, when the blade is determined to be abnormal in pneumatic operation, an alarm signal is sent out to remind a worker to perform corresponding treatment in time. And starting a protection control mode of pneumatic abnormity of the blade to protect the wind turbine generator and reduce subsequent loss.
The implementation principle of the method for detecting the aerodynamic abnormality of the blades of the wind turbine generator set in the embodiment of the application is as follows: the method comprises the steps of obtaining voltage fluctuation frequency of direct-current bus voltage of a variable pitch motor driver, comparing the voltage fluctuation frequency with a preset fluctuation frequency threshold value, wherein the factor influencing the voltage fluctuation frequency is overlarge movement speed of a variable pitch motor or abnormal blade aerodynamics, obtaining the movement speed of the variable pitch motor if the bus voltage fluctuation is abnormal, and determining the abnormal blade aerodynamics if the movement speed of the variable pitch motor is smaller than the preset movement speed threshold value of the variable pitch motor, namely the movement speed of the variable pitch motor is normal.
The embodiment of the application discloses wind turbine generator system blade is pneumatic unusual detecting system, refer to FIG. 6, this system includes:
the variable pitch motor driver comprises a first acquisition module 1, a second acquisition module and a control module, wherein the first acquisition module 1 is used for acquiring the voltage fluctuation frequency of the direct-current bus voltage of the variable pitch motor driver;
the fluctuation frequency judgment module 2 is connected with the first acquisition module, and is used for receiving the voltage fluctuation frequency acquired by the first acquisition module, judging whether the voltage fluctuation frequency is abnormal or not and outputting a judgment result;
the second acquisition module 3 is used for acquiring the movement speed of the variable pitch motor;
the movement speed detection module 4 is connected with the second acquisition module and used for judging whether the movement speed is in a high-speed state or a low-speed state and outputting a judgment result;
and the processing module 5 is used for detecting whether the blade aerodynamics is abnormal or not based on the judgment result of the fluctuation frequency judgment module 2 and the judgment result of the movement speed detection module 4.
Referring to fig. 6, the first obtaining module 1 includes a first collecting unit 11, a first threshold unit 12, and a calculating unit 13, the calculating unit 13 is connected to the first collecting unit 11 and the first threshold unit 12, the first collecting unit 11 is configured to collect real-time bus voltage and corresponding time information in real time, a bus voltage threshold is stored in the first threshold unit 12, and the calculating unit 13 counts the number of times of fluctuation of the bus voltage according to the real-time bus voltage and the corresponding time information, and obtains a voltage fluctuation frequency.
Specifically, the first acquisition unit 11 acquires and records a bus voltage of the pitch motor, and when the recorded data is N milliseconds, the dc bus voltage of the pitch motor driver is M volts, for example, when 500ms, the dc bus voltage of the pitch motor driver is 530V.
Specifically, a bus voltage threshold range is stored in the first threshold unit 12, for example, the bus voltage threshold range is set to 500V to 600V, i.e., the bus voltage range is normally 500V to 600V.
Specifically, when the bus voltage exceeds the bus voltage threshold range and returns to the bus voltage threshold range within a certain time, it is determined that the bus voltage fluctuates once, and the calculation unit 13 records the bus voltage. And meanwhile, setting a time region, counting the times of fluctuation of the bus voltage in the time region, and acquiring the voltage fluctuation frequency of the direct-current bus voltage of the variable pitch motor driver. In this embodiment, the calculation unit 13 registers a surge when the bus voltage exceeds 600V and returns to within the bus voltage threshold again within 300 ms. Meanwhile, the calculation unit 13 acquires a voltage fluctuation frequency = the number of times of fluctuation of the bus voltage/500 ms from the number of times of fluctuation of the bus voltage and the time zone.
Referring to fig. 6, the fluctuation frequency determination module 2 includes a second threshold unit 21 and a determination unit 22, the second threshold unit 21 is connected to the determination unit 22, the determination unit 22 is connected to the calculation unit 13, a fluctuation frequency threshold of a direct current bus voltage of a pitch motor driver is stored in the second threshold unit 21, the determination unit 22 receives a voltage fluctuation frequency obtained by the calculation unit 13, compares the voltage fluctuation frequency with the fluctuation frequency threshold, and determines that the bus voltage fluctuation is abnormal when the voltage fluctuation frequency is greater than or equal to the fluctuation frequency threshold; and when the voltage fluctuation frequency is smaller than the fluctuation frequency threshold value, determining that the bus voltage fluctuation is normal.
Specifically, a fluctuation frequency threshold is preset in the second threshold unit 21, and the fluctuation frequency threshold is set to F, and in the present embodiment, F =2 times/500 ms is set.
Specifically, for example, when the judgment unit 22 receives that the voltage fluctuation frequency is equal to 3 times/500 ms, the judgment unit 22 determines that the bus voltage fluctuation is abnormal; when the bus voltage fluctuation frequency received by the judging unit 22 is equal to 0 times/500 ms, the judging unit 22 determines that the bus voltage fluctuation is normal.
Referring to fig. 6, the movement speed detection module 4 includes a third threshold unit 41 and a detection unit 42, the third threshold unit 41 is connected to the detection unit 42, a movement speed threshold of the pitch motor is preset in the third threshold unit 41, and the detection unit 42 is configured to detect a real-time movement speed of the pitch motor and detect whether the real-time movement speed of the pitch motor is greater than the movement speed threshold.
Specifically, a movement speed threshold of the pitch motor is preset in the third threshold unit 41, and the movement speed of the pitch motor is set to be W, in this embodiment, W = pi/60 (unit: rad/s) is set as the movement speed threshold, that is, the pitch motor rotates 3 ° per second as the movement speed threshold.
Specifically, for example, when the detection unit 42 detects that the movement speed of the pitch motor is pi/50 (unit: rad/s), it is determined that the movement speed is greater than the movement speed threshold; when the detection unit 42 detects that the movement speed of the pitch motor is pi/100 (unit: rad/s), the movement speed is determined to be smaller than the movement speed threshold.
Referring to fig. 6, the processing module 5 includes a processing unit 51, an alarm unit 52 and an adjusting unit 53, the processing unit 51 is connected to the judging unit 22 and the detecting unit 42, and the processing unit 51 detects whether the blade aerodynamics is abnormal based on the judgment result of the judging unit 22 and the detection result of the detecting unit 42. When the processing unit 51 determines that the blade is abnormal in pneumatic mode, the alarm unit 52 gives an alarm through modes such as a buzzer and/or light flashing and the like, and reminds a worker to perform corresponding processing in time. The adjusting unit 53 will control the wind turbine to enter a protection control mode of blade aerodynamic anomaly.
Specifically, when the judging unit 22 determines that the bus voltage is abnormal and the detecting unit 42 detects that the movement speed of the pitch motor is smaller than the movement speed threshold, the processing unit 51 determines that the blade is aerodynamic normal; when the judging unit 22 determines that the bus voltage is abnormal and the detecting unit 42 detects that the movement speed of the pitch motor is greater than the movement speed threshold, the processing unit 51 determines that the blade is aerodynamically abnormal.
The implementation principle of the system for detecting the aerodynamic abnormality of the blades of the wind turbine generator set is as follows: after the first obtaining module 1 obtains the voltage fluctuation frequency, the fluctuation frequency judging module 2 judges whether the voltage fluctuation frequency is abnormal, and the reason causing the abnormal voltage fluctuation frequency is that the movement speed of the variable pitch motor is too large or the blade is abnormal pneumatically, so that whether the blade is abnormal pneumatically can be judged according to the movement speed of the variable pitch motor obtained by the second obtaining module 3. When the voltage fluctuation frequency is abnormal and the movement speed detection module 4 detects that the movement speed of the variable pitch motor is in a low-speed state, the processing module 5 determines that the blade is in pneumatic abnormity. The system can timely detect whether the blade generates pneumatic abnormity in various external environments, is not influenced by the power of the unit, does not add any external equipment, and is convenient.
The embodiment of the application also discloses a computer readable storage medium, and the computer readable storage medium stores a computer program, wherein when the computer program is executed by a processor, the wind turbine blade aerodynamic abnormality detection method of the embodiment is adopted.
The computer program may be stored in a computer readable medium, the computer program includes computer program code, the computer program code may be in a source code form, an object code form, an executable file or some intermediate form, and the like, the computer readable medium includes any entity or device capable of carrying the computer program code, a recording medium, a usb disk, a removable hard disk, a magnetic disk, an optical disk, a computer memory, a Read Only Memory (ROM), a Random Access Memory (RAM), an electrical carrier signal, a telecommunication signal, a software distribution medium, and the like, and the computer readable medium includes but is not limited to the above components.
The method for detecting the aerodynamic abnormality of the blades of the wind turbine generator set is stored in the computer-readable storage medium through the computer-readable storage medium, and is loaded and executed on the processor, so that the method is convenient to store and apply.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. The method for detecting the aerodynamic abnormality of the blades of the wind turbine generator is characterized by comprising the following steps of:
acquiring voltage fluctuation frequency of direct-current bus voltage of a variable pitch motor driver;
judging whether the voltage fluctuation frequency is abnormal or not based on a preset fluctuation frequency threshold, if so, acquiring the movement speed of the variable pitch motor, and if not, continuously acquiring the voltage fluctuation frequency;
if the movement speed is larger than a preset movement speed threshold value, determining that the blade is normal in pneumatic operation;
and if the movement speed is less than or equal to a preset movement speed threshold value, determining that the blade is in pneumatic abnormity.
2. The method for detecting the aerodynamic abnormality of the blades of the wind turbine generator set according to claim 1, wherein the step of obtaining the voltage fluctuation frequency of the direct-current bus voltage of the variable pitch motor driver comprises the following steps:
acquiring bus voltage and corresponding time information in real time, wherein the bus voltage is direct-current bus voltage of a variable pitch motor driver;
and acquiring the voltage fluctuation frequency based on the bus voltage and corresponding time information.
3. The method for detecting the aerodynamic abnormality of the blades of the wind turbine generator set according to claim 2, wherein the step of obtaining the voltage fluctuation frequency based on the bus voltage and corresponding time information comprises the steps of:
determining a bus voltage threshold range, and determining that the bus voltage fluctuates once when the bus voltage exceeds the bus voltage threshold range and returns to the bus voltage threshold range within a certain time;
and setting a time region, and counting the number of times of fluctuation of the bus voltage in the time region to obtain the voltage fluctuation frequency.
4. The method for detecting the aerodynamic abnormality of the blades of the wind turbine generator set according to claim 3, wherein the method for detecting the aerodynamic abnormality of the blades of the wind turbine generator set is characterized in that whether the voltage fluctuation frequency is abnormal or not is judged based on a preset fluctuation frequency threshold, if the voltage fluctuation frequency is abnormal, the movement speed of the variable pitch motor is obtained, and if the voltage fluctuation frequency is normal, the method for continuously obtaining the voltage fluctuation frequency of the variable pitch motor comprises the following steps:
if the voltage fluctuation frequency is larger than or equal to a preset fluctuation frequency threshold value, determining that the bus voltage fluctuation is abnormal, and then acquiring the movement speed of the variable pitch motor;
and if the voltage fluctuation frequency is smaller than a preset fluctuation frequency threshold value, determining that the bus voltage fluctuation is normal, and continuously acquiring the voltage fluctuation frequency of the variable pitch motor.
5. The method for detecting the aerodynamic abnormality of the blade of the wind turbine generator set according to claim 4, wherein if the movement speed is less than or equal to a preset movement speed threshold value, after determining that the blade is aerodynamically abnormal, the method further comprises:
sending out an alarm signal;
and starting a protection control mode of the pneumatic abnormity of the blade.
6. The utility model provides a wind turbine generator system blade aerodynamic anomaly detection system which characterized in that includes:
the device comprises a first acquisition module (1), a second acquisition module and a control module, wherein the first acquisition module (1) is used for acquiring the voltage fluctuation frequency of the direct-current bus voltage of a variable pitch motor driver;
the fluctuation frequency judgment module (2), the fluctuation frequency judgment module (2) is connected with the first acquisition module, and is used for receiving the voltage fluctuation frequency acquired by the first acquisition module, judging whether the voltage fluctuation frequency is abnormal or not, and outputting a judgment result;
the second acquisition module (3) is used for acquiring the movement speed of the variable pitch motor;
the movement speed detection module (4) is connected with the second acquisition module and is used for judging whether the movement speed is in a high-speed state or a low-speed state and outputting a judgment result;
and the processing module (5), the processing module (5) is used for detecting whether the blade aerodynamics is abnormal or not based on the judgment result of the fluctuation frequency judgment module (2) and the detection result of the movement speed detection module (4).
7. The system according to claim 6, characterized in that said first acquisition module (1) comprises:
the system comprises a first acquisition unit (11), wherein the first acquisition unit (11) is used for acquiring real-time bus voltage and corresponding time information, and the bus voltage is direct-current bus voltage of a variable pitch motor driver;
a first threshold value unit (12), wherein a bus voltage threshold value is stored in the first threshold value unit (12);
the first calculating unit (13) is used for counting the fluctuation times of the bus voltage in a preset time period and acquiring voltage fluctuation frequency.
8. The system for detecting the aerodynamic abnormality of the blade of the wind turbine generator set according to claim 7, wherein the fluctuation frequency judgment module (2) comprises:
a second threshold value unit (21), wherein a fluctuation frequency threshold value is preset in the second threshold value unit (21);
the judging unit (22) is used for comparing the voltage fluctuation frequency with the fluctuation frequency threshold, if the voltage fluctuation frequency exceeds the fluctuation frequency threshold, the bus voltage fluctuation is determined to be abnormal, and if the voltage fluctuation frequency does not exceed the fluctuation frequency threshold, the bus voltage fluctuation is determined to be normal.
9. The system according to claim 8, characterized in that said processing module (5) comprises:
a processing unit (51), wherein the processing unit (51) is used for detecting whether the blade aerodynamics is abnormal or not based on the judgment result of the fluctuation frequency judgment module (2) and the detection result of the movement speed detection module (4);
the alarm unit (52) is used for sending abnormal information to the alarm unit (52) when the processing unit (51) determines that the blade is in pneumatic abnormity, and the alarm unit (52) is used for sending an alarm signal;
the adjusting unit (53) is connected with the alarm unit (52), and after the alarm unit (52) sends an alarm signal, the adjusting unit (53) controls the wind turbine generator to enter a protection control mode of blade pneumatic abnormity.
10. A computer-readable storage medium, in which a computer program is stored, which, when loaded and executed by a processor, carries out the method of any one of claims 1 to 5.
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