CN112128053A - Blade feathering control method, wind generating set main controller and variable pitch controller - Google Patents
Blade feathering control method, wind generating set main controller and variable pitch controller Download PDFInfo
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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
- F03D7/0204—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor for orientation in relation to wind direction
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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
- 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
- F03D7/0224—Adjusting blade pitch
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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
- F03D7/0276—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor controlling rotor speed, e.g. variable speed
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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
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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
- F03D80/50—Maintenance or repair
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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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- Wind Motors (AREA)
Abstract
The invention discloses a blade feathering control method, a wind generating set main controller and a variable pitch controller, wherein the blade feathering control method for the main controller side comprises the following steps: receiving a pitching state sent by a variable pitch controller of n blades of a wind generating set, wherein n is an integer greater than or equal to 2; if the opening states of the n blades are all manual opening states, determining the actual rotating speed of the wind generating set; and if the actual rotating speed is greater than a first preset rotating speed, respectively sending a cancellation instruction of a manual feathering state to the variable pitch controllers of the n blades so as to enable the n blades to execute automatic feathering operation, wherein the first preset rotating speed is less than the rated rotating speed of the wind generating set. By adopting the technical scheme in the embodiment of the invention, the abnormal overspeed working condition of the wind generating set in the manual opening state can be treated emergently, so that the safe operation of the wind generating set is ensured.
Description
Technical Field
The invention relates to the technical field of wind power generation, in particular to a blade feathering control method, a wind generating set main controller and a variable pitch controller.
Background
Wind turbine generators are devices that convert wind energy into electrical energy. When the wind generating set is in fault operation, the variable pitch system of the wind generating set can execute an emergency feathering function, the pitch angle of the blades is reduced from 0 degree to 90 degrees so as to realize pneumatic braking, and then fault troubleshooting is carried out on the wind generating set in a way of opening the blades for maintenance. In the process of the paddle opening maintenance, only one blade is required to be operated at each time, that is, one blade is allowed to be operated to 0 degree, and before the next blade is operated to be operated, the previous blade needs to be feathered to 90 degrees, so that the safe operation of the wind generating set is ensured.
At present, three variable pitch cabinets of a variable pitch system are controlled independently, and a variable pitch controller in each variable pitch cabinet is responsible for controlling the variable pitch operation of one blade, so that automatic operation control of selecting one from three of the variable pitch cabinets cannot be realized on program logic, and the single-blade opening operation required by the opening maintenance process needs to be strictly followed and executed by operation and maintenance personnel.
However, the safety training of the operation and maintenance personnel is not in place and is limited by understanding of the operation mechanism and the air performance of the wind generating set, so that the operation is easy to be wrong, three blades are driven to be driven simultaneously, and in this case, once the wind speed is increased suddenly to cause gust, the rotating speed of the generator is also increased suddenly, so that the accident that the wind generating set is over-speed or even falls down to the tower is easily caused, and the safe operation of the wind generating set is influenced.
Disclosure of Invention
The embodiment of the invention provides a blade feathering control method, a main controller, a variable pitch controller and a storage medium, which can emergently process the abnormal overspeed working condition of a wind generating set in a manual pitching state, thereby ensuring the safe operation of the wind generating set.
In a first aspect, an embodiment of the present invention provides a blade feathering control method, which is used for a main controller of a wind turbine generator system, and the method includes:
receiving a pitching state sent by a variable pitch controller of n blades of a wind generating set, wherein n is an integer greater than or equal to 2;
if the opening states of the n blades are all manual opening states, determining the actual rotating speed of the wind generating set;
and if the actual rotating speed is greater than a first preset rotating speed, respectively sending a cancellation instruction of a manual feathering state to the variable pitch controllers of the n blades so as to enable the n blades to execute automatic feathering operation, wherein the first preset rotating speed is less than the rated rotating speed of the wind generating set.
In one possible embodiment of the first aspect, after the step of determining the actual rotational speed of the wind park, the method further comprises: and if the actual rotating speed is greater than the first preset rotating speed and the impeller locking pin of the wind generating set is withdrawn, respectively sending a cancellation instruction of the manual oar opening state to the variable propeller controllers of the n blades so as to enable the n blades to execute automatic feathering operation.
In a possible embodiment of the first aspect, the deactivating command is a pulse signal and/or the first predetermined rotational speed is greater than a minimum steady rotational speed at which the rotational speed is measured.
In a possible implementation manner of the first aspect, after the step of sending the cancellation instruction of the manual pitching state to the pitch controllers of the n blades respectively, the method further includes: if the actual rotating speed is less than a second preset rotating speed and at least two of the n blades are retracted to a preset safe pitch angle, stopping sending a cancellation instruction and controlling the brake valve of the wind generating set to brake; wherein the second preset rotating speed is less than the first preset rotating speed.
In one possible embodiment of the first aspect, the second predetermined rotational speed is greater than a minimum steady rotational speed at which the rotational speed is measured.
In a second aspect, an embodiment of the present invention provides a blade feathering control method, which is used for a pitch controller of a wind turbine generator system, and the method includes:
obtaining the opening state of the blade correspondingly controlled by the variable pitch controller;
and if the opening state of the blade correspondingly controlled by the variable pitch controller is the manual opening state and a cancellation instruction of the manual opening state sent by a main controller of the wind generating set is received, quitting the manual opening state and executing automatic feathering operation on the blade correspondingly controlled by the variable pitch controller.
In a third aspect, an embodiment of the present invention provides a main controller of a wind turbine generator system, including: the pitching state receiving module is used for receiving a pitching state sent by a pitching controller of n blades of the wind generating set, wherein n is an integer greater than or equal to 2; the actual rotating speed determining module is used for determining the actual rotating speed of the wind generating set if the pitching states of the n blades are all manual pitching states; and the cancellation instruction sending module is used for respectively sending cancellation instructions of a manual feathering state to the pitch controllers of the n blades if the actual rotating speed is greater than a first preset rotating speed so as to enable the n blades to execute automatic feathering operation, wherein the first preset rotating speed is less than the rated rotating speed of the wind generating set.
In a fourth aspect, an embodiment of the present invention provides a pitch controller of a wind turbine generator system, including: the pitching state obtaining module is used for obtaining the pitching state of the blades correspondingly controlled by the pitch controller; and the cancellation instruction execution module is used for quitting the manual starting state and executing automatic feathering operation on the blades correspondingly controlled by the variable pitch controller if the starting state of the blades correspondingly controlled by the variable pitch controller is the manual starting state and the variable pitch controller receives a cancellation instruction of the manual starting state sent by the main controller of the wind generating set.
In a fifth aspect, embodiments of the present invention provide a computer device having a program stored thereon, wherein the program, when executed by a processor, implements a blade feathering control method as described above.
In a sixth aspect, embodiments of the present invention provide a storage medium having a program stored thereon, where the program, when executed by a processor, implements a blade feathering control method as described above.
When the main controller monitors that all the n blades of the wind generating set are in the manual feathering state, the main controller closely monitors the actual rotating speed of the wind generating set, and timely sends emergency cancelling instructions for the manual feathering state to the pitch controllers of the n blades when the actual rotating speed of the wind generating set is increased to a first preset rotating speed (namely before the rated rotating speed), so that the n blades can execute automatic feathering operation.
The main controller of the embodiment of the invention sends the cancellation instruction of the manual opening state of each branch blade before the actual rotating speed of the wind generating set is increased to the rated rotating speed, and can reduce the rotating speed of the wind generating set in advance by enabling each branch blade to execute the automatic feathering operation, thereby completing the emergency treatment of the abnormal overspeed of the wind generating set in the manual opening state and ensuring the safe operation of the wind generating set.
Drawings
The present invention may 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 identify like or similar features.
FIG. 1 is a schematic structural diagram of a pitch system of a wind generating set according to an embodiment of the invention;
FIG. 2 is a communication topology diagram of a wind generating set according to an embodiment of the present invention;
FIG. 3 is a schematic view of the working state of a pitch system according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of a blade feathering control method for a main controller side of a wind turbine generator system according to an embodiment of the present invention;
FIG. 5 is a schematic flow chart of a method for controlling blade feathering at the main controller side of a wind turbine generator system according to another embodiment of the present invention;
FIG. 6 is a schematic flow chart of a method for controlling blade feathering at the main controller side of a wind turbine generator system according to yet another embodiment of the present invention;
FIG. 7 is a schematic diagram of the pulse signals of an undo instruction according to an embodiment of the present invention;
FIG. 8 is a schematic flow chart of a method for controlling blade feathering at a pitch controller side of a wind turbine generator system according to an embodiment of the present invention;
FIG. 9 is a flowchart of a method for blade feathering control between a master controller and a pitch controller according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a main controller of a wind generating set according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a pitch controller of a wind turbine generator system according to an 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.
Fig. 1 is a schematic structural diagram of a pitch system of a wind turbine generator system according to an embodiment of the present invention. In fig. 1, a hub 101 and blades 102 and 103 mounted on the hub 101 are shown, the hub 101 being rotatable relative to the nacelle (the nacelle being stationary) and carrying the blades 102 and 103 in rotation.
Taking the blade 102 as an example, the pitch motor 104 may drive the blade 102 to pitch through the pitch bearing 106 after receiving a pitch command from the pitch controller 105. When the variable pitch control device is specifically implemented, one variable pitch controller can be electrically connected with the variable pitch motors of the three blades respectively, and the three variable pitch controllers can also be electrically connected with the variable pitch motors of the three blades in a one-to-one correspondence manner.
And the encoder 107 is arranged on the rotating shaft of the variable pitch motor 104 and is used for measuring the rotating angle of the variable pitch motor 104 to obtain the pitch angle of the blade. If the plane of the three blades is taken as a reference plane, the pitch angle of any blade is the included angle between the blade and the reference plane.
An azimuth sensor 109 is mounted on the fan main shaft 108 and used for measuring the azimuth of the hub 101 to obtain the azimuth of the blade. If the azimuth angle when the tip of a certain blade is upward is set to 0 degree, the azimuth angle when the blade is rotated once again to the tip of the blade upward is 360 degrees (similar to the direction when the clock points to 12 points), and as the blade rotates along with the hub 101, the azimuth angle of the blade also continuously and periodically changes between 0 degree and 360 degrees.
As shown in fig. 1, a brake disc 110 is connected with the fan main shaft 108, brake valves 111 are located on two sides of the brake disc 110 and are used for controlling braking of the brake disc 110 and the fan main shaft 108, and a main controller 112 controls brake release and brake locking of the brake valves 111 in addition to controlling opening and closing of the blades of the fan and the pitch system.
Fig. 2 is a communication topology schematic diagram of a wind generating set according to an embodiment of the present invention. The topology shown in FIG. 2 includes pitch controller 201, pitch controller 202, pitch controller 203, slip ring 204, and main controller 112.
During specific implementation, the pitch controller 201, the pitch controller 202 and the pitch controller 203 are respectively located in three pitch cabinets, the three pitch cabinets are controlled independently, and the pitch controller in each pitch cabinet is responsible for controlling the pitch operation of one blade.
The slip ring 204 is used for connecting the nacelle to the hub 101, wherein the nacelle is fixed and the hub 101 rotates with the blades.
The main controller 112 is configured to control the start, operation, and stop of the wind turbine generator system, and issue pitch angle control instructions to the pitch controller 201, the pitch controller 202, and the pitch controller 203, respectively.
Fig. 3 is a schematic view of the working state of the pitch system according to the embodiment of the present invention, and as shown in fig. 3, the working state of the pitch system mainly includes a manual state and an automatic state.
The automatic state comprises a normal operation state and a feathering state, the normal operation state refers to a process that the variable pitch system executes feathering according to instructions of the main controller under a fault-free condition, and the feathering state refers to a process that the variable pitch system completes feathering under a fault condition.
As can be seen from fig. 3, the manual state has the highest priority, i.e. the pitch system in the manual state is not able to perform auto-feathering and auto-fault feathering. In one example, the manual state and the automatic state are switched by a manual knob, the manual state is entered after the manual knob is closed, and the automatic state is recovered after the manual knob is released.
At present, after a fault occurs, a wind generating set needs to be subjected to fault troubleshooting in a way of paddle opening maintenance, and the paddle opening maintenance process requires that only one blade is subjected to paddle opening operation at each time so as to ensure the safe operation of the wind generating set. However, since the three pitch control cabinets of the pitch control system are controlled independently, and the pitch controller in each pitch control cabinet is responsible for controlling the pitch control operation of one blade, the automatic operation control of selecting one from three of the pitch control cabinets cannot be realized on the program logic, so that the single-blade pitch control operation required by the pitch control maintenance process needs to be strictly followed and executed by operation and maintenance personnel.
However, since the safety training of the operation and maintenance personnel cannot be correspondingly followed or the operation mechanism and the maneuverability of the wind turbine generator set cannot be known, the operation errors are easy, such as: when wind is very small, no danger exists when three blades are driven to 0 ℃, so that two blades or three blades are driven at the same time in the wind power plant. However, the wind speed is transient, and when the wind speed suddenly increases to cause gust, the torque value also increases correspondingly after the rotating speed of the wind generating set is increased in order to realize the maximum power output, so that the rotating speed of the generator is suddenly increased.
Considering the power generation operation of the wind generating set, the energy conservation formula between the wind energy W1, the rotation action W2 generated by the generator by the wind energy and the electromagnetic torque W3 of the generator is as follows:
W1＝W2+W3 (1)
as can be known from the formula (1), when the W1 suddenly becomes large due to wind gust, the wind energy W1 is increased because the electromagnetic torque W3 is 0 and the W1 and the W3 are in a complete linear relationship when the wind generating set is stopped and not connected to the grid, and at the moment, if two blades or three blades are simultaneously driven, the wind generating set is easy to cause an over-speed accident and even a tower falling accident, and the safe operation of the wind generating set is influenced.
Based on the above, the embodiment of the invention provides a blade feathering control method, a wind generating set main controller and a variable pitch controller.
Fig. 4 is a schematic flow chart of a blade feathering control method for a main controller side of a wind turbine generator system according to an embodiment of the present invention. As shown in fig. 4, the blade feathering control method includes steps 401 and 403.
In step 401, a pitching state sent by a pitch controller of n blades of a wind turbine generator system is received, where n is an integer greater than or equal to 2.
In step 402, if the n blades are all in the manual opening state, the actual rotation speed of the wind turbine generator set is determined.
In step 403, if the actual rotation speed is greater than a first preset rotation speed, a cancellation instruction for the manual feathering state is sent to the pitch controllers of the n blades, so that the n blades perform automatic feathering operation, wherein the first preset rotation speed is less than the rated rotation speed of the wind turbine generator system.
Taking the wind generating set with three blades as an example, if two blades are in a manual blade opening state at the same time, even if the pitch angles of the two blades are both 0 degree, the wind power received by the impeller is still limited, and the rotating speed of the wind generating set cannot rise quickly. However, if the three blades are in the manual opening state at the same time, it is described that the operation and maintenance personnel simultaneously perform the opening operation on the three blades, once the pitch angles of the three blades are all opened to 0 degrees, the wind power received by the impeller is rapidly increased, the rotating speed of the wind generating set also suddenly rises, and overspeed is easily caused.
When the main controller monitors that all the n blades of the wind generating set are in the manual feathering state, the main controller closely monitors the actual rotating speed of the wind generating set, and timely sends emergency cancelling instructions for the manual feathering state to the pitch controllers of the n blades when the actual rotating speed of the wind generating set is increased to a first preset rotating speed (namely before the rated rotating speed), so that the n blades can execute automatic feathering operation.
The main controller of the embodiment of the invention sends the cancellation instruction of the manual opening state of each branch blade before the actual rotating speed of the wind generating set is increased to the rated rotating speed, and can reduce the rotating speed of the wind generating set in advance by enabling each branch blade to execute the automatic feathering operation, thereby completing the emergency treatment of the abnormal overspeed of the wind generating set in the manual opening state and ensuring the safe operation of the wind generating set.
Fig. 5 is a schematic flow chart of a blade feathering control method for a main controller side of a wind turbine generator system according to another embodiment of the present invention. Fig. 5 differs from fig. 4 in that the blade feathering control method further comprises step 404 in fig. 5 after step 402 in fig. 4.
In step 404, if the actual rotation speed is greater than the first preset rotation speed and the impeller locking pin of the wind turbine generator system is withdrawn, a cancellation instruction for the manual feathering state is sent to the pitch controllers of the n blades respectively, so that the n blades perform the automatic feathering operation.
Typically, the maintenance personnel are considered to be within the hub without the impeller locking pin backing out. In order to avoid damage to operation and maintenance personnel, step 404 adds a determination link for determining whether the impeller locking pin exits, and only when it is determined that the impeller locking pin exits, the cancellation instructions for the manual pitching state are sent to the pitch controllers of the n blades, so that the safety of the operation and maintenance personnel is protected.
In some embodiments, limited by the measurement accuracy, the rotation speed is low, and the measurement accuracy is low, the error is large, or the measurement data has a jump, and the data jump causes repeated sending and stopping of the withdrawal instruction. To avoid this problem, the first preset rotation speed in the embodiment of the present invention should be greater than the minimum stable rotation speed when the rotation speed is measured, where the minimum stable rotation speed refers to the minimum rotation speed (for example, 4rpm) when the rotation speed measurement value is stable, so as to improve the reliability of the cancellation command.
Fig. 6 is a schematic flow chart of a blade feathering control method for a main controller side of a wind turbine generator system according to yet another embodiment of the present invention. Fig. 6 differs from fig. 4 in that the blade feathering control method further comprises step 405 in fig. 6 after step 403 in fig. 4.
In step 405, if the actual rotation speed is less than a second preset rotation speed and at least two of the n blades have already retracted to a preset safe pitch angle, the transmission of the cancel command is stopped and the wind turbine generator system is controlled to brake, wherein the second preset rotation speed is less than the first preset rotation speed.
Wherein the preset safe pitch angle may be understood as 90 degrees or close to 90 degrees.
If the actual rotating speed of the wind generating set is less than the second preset rotating speed, the actual rotating speed of the wind generating set is reduced to a safe value, and at the moment, if at least two of the n blades are retracted to a safe pitch angle, the rotating speed of the current wind generating set is in a controlled state and cannot be increased any more, so that the main controller can cancel a cancel instruction and control the brake valve of the wind generating set to brake.
In some embodiments, to avoid reducing the reliability of the cancel command due to the limitation of the measurement accuracy, the second preset rotation speed should also be greater than the minimum stable rotation speed (e.g. 4rpm) during the rotation speed measurement.
In some embodiments, the undo instruction may be a pulse signal.
FIG. 7 is a schematic diagram of a pulse signal of an undo instruction according to an embodiment of the present invention. The abscissa is time, the ordinate is a level value, t1 corresponds to a high level, t2 corresponds to a low level, and the duration and the proportion of the high level and the low level can be set in agreement in a communication protocol between the main controller and the pitch controller, which is not limited herein.
The inventor of the present application finds, in implementation, that a continuous low-level command may cause a cancellation command to be triggered erroneously due to interruption of slip ring communication data, and a continuous high-level command may cause a cancellation command to be triggered erroneously due to program logic or abnormal numerical value writing, so as to avoid reduction in reliability of the cancellation command due to false triggering caused by a simple high level or a simple low level.
In particular, a register of a manual-opening state withdrawal flag can be set in the pitch controller. And if the main controller detects that the three blades are in the manual blade opening state and the actual rotating speed of the wind generating set is greater than a first preset rotating speed, continuously sending pulse signals to the variable pitch controllers of the n blades respectively. After receiving the pulse signal continuously sent by the main controller, the variable pitch controller sets the manual opening state cancellation flag, the corresponding register value is changed to 1, and at the moment, the blade is switched from the manual opening state to the automatic state to execute the automatic feathering operation.
And stopping respectively sending pulse signals to the variable pitch controllers of the n blades until the main controller detects that the actual rotating speed of the wind generating set is less than the second preset rotating speed and at least two blades in the n blades have already received the safe pitch angle. And after the variable pitch controller detects that the pulse signal sent by the main controller is interrupted, clearing the manual opening state canceling mark, and changing the corresponding register value into 0.
Fig. 8 is a schematic flow chart of a blade feathering control method for a pitch controller side of a wind turbine generator system according to an embodiment of the present invention, where the blade feathering control method includes step 801 and step 802.
In step 801, the opening state of the blade controlled by the pitch controller is obtained.
In step 802, if the pitching state of the blade correspondingly controlled by the pitch controller is the manual pitching state and a cancellation instruction of the manual pitching state sent by the main controller of the wind turbine generator system is received, exiting the manual pitching state and executing the automatic feathering operation on the blade correspondingly controlled by the pitch controller.
In the embodiment of the invention, the variable pitch controller actively quits the manual opening state and executes automatic feathering operation on the blades correspondingly controlled by the variable pitch controller after the opening state of the blades correspondingly controlled is the manual opening state and receives a cancellation instruction of the manual opening state sent by the main controller, so that the wind power received by the blades is reduced, the rotating speed of the wind generating set is reduced, the emergency treatment of abnormal overspeed of the wind generating set in the manual opening state is completed by matching with the main controller, and the safe operation of the wind generating set is ensured.
Compared with the prior art, the blade feathering control method can utilize data interaction between the main controller and the variable pitch controller to realize emergency processing of abnormal overspeed of the wind generating set in a manual pitching state. The newly-added communication data between the main controller and the variable pitch controller comprises the following steps: and the variable pitch controller returns the manual starting state to the main controller, the judgment information of the main controller on the manual starting state and a cancellation command of the manual starting state to the variable pitch controller after unified integration and coordination configuration.
In addition, by adopting the technical scheme in the embodiment of the invention, operation and maintenance personnel do not need to carry out any manual setting in the operation process and are completely and automatically realized by a program; the control software can realize the functions only by simple modification, and the development and update time is short and the workload is small; meanwhile, the accident prevention and treatment mode is pre-control, the safety of the wind generating set can be effectively guaranteed, the problems of misoperation, negligence and the like of personnel are fundamentally solved, and the method of the wind generating set is not limited by types of machines and types of a variable pitch system.
FIG. 9 is a flowchart of a method for controlling blade feathering between a master controller and a pitch controller according to an embodiment of the present invention. As shown in fig. 9, the blade feathering control method includes steps 901 to 909.
In step 901, the pitch controller detects the opening state of the blades and sends the opening state to the main controller.
In step 902, the main controller determines whether all the three blades are in the manual opening state, if so, step 903 is executed, otherwise, the process returns to step 902.
In step 903, the main controller determines whether the impeller lock pin is withdrawn, if so, step 904 is performed, otherwise, step 903 is returned to.
In step 904, the main controller determines whether the actual rotation speed of the wind turbine generator system is greater than n1, if so, step 905 is executed, otherwise, the step 904 is returned to. Wherein n1 is less than the stable rotation speed of the wind generating set and greater than the minimum stable rotation speed during measurement.
In step 905, the master controller sends a cancel command of the manual opening state to the three blades in a fixed pulse manner.
In step 906, the pitch controller determines whether the pitching state of the blade corresponding to the control is a manual pitching state and receives a cancel instruction sent by the main controller, if so, step 907 is executed, and if not, step 906 is returned to.
In step 907, the pitch controller exits the manual feathering state and performs an automatic feathering operation.
In step 908, the main controller determines whether the actual rotation speed of the wind turbine generator system is less than n2 and at least two blades are retracted to the safe position, if yes, step 909 is executed, otherwise, step 908 is returned. Wherein n2 is less than n1 and greater than the minimum stable rotational speed at the time of measurement.
In step 909, the main controller stops sending the cancel command and controls the brake valve to brake.
Fig. 10 is a schematic structural diagram of a main controller of a wind turbine generator system according to an embodiment of the present invention, and as shown in fig. 10, the main controller includes a pitching state receiving module 1001 (which has a function corresponding to step 401), an actual rotation speed determining module 1002 (which has a function corresponding to step 402), and a cancellation command sending module 1003 (which has a function corresponding to step 403).
The pitching state receiving module 1001 is configured to receive a pitching state sent by a pitch controller of n blades of the wind turbine generator system, where n is an integer greater than or equal to 2.
The actual rotation speed determination module 1002 is configured to determine an actual rotation speed of the wind turbine generator system if all the n blades are in the manual opening state.
The cancellation instruction sending module 1003 is configured to send a cancellation instruction for a manual feathering state to the pitch controllers of the n blades respectively if the actual rotation speed is greater than a first preset rotation speed, so that the n blades perform an automatic feathering operation, where the first preset rotation speed is less than a rated rotation speed of the wind turbine generator system.
When the main controller monitors that all the n blades of the wind generating set are in the manual feathering state, the main controller closely monitors the actual rotating speed of the wind generating set, and timely sends emergency cancelling instructions for the manual feathering state to the pitch controllers of the n blades when the actual rotating speed of the wind generating set is increased to a first preset rotating speed (namely before the rated rotating speed), so that the n blades can execute automatic feathering operation.
The main controller of the embodiment of the invention sends the cancellation instruction of the manual opening state of each branch blade before the actual rotating speed of the wind generating set is increased to the rated rotating speed, and can reduce the rotating speed of the wind generating set in advance by enabling each branch blade to execute the automatic feathering operation, thereby completing the emergency treatment of the abnormal overspeed of the wind generating set in the manual opening state and ensuring the safe operation of the wind generating set.
Fig. 11 is a schematic structural diagram of a main controller of a wind turbine generator system according to an embodiment of the present invention, and as shown in fig. 11, the main controller includes a pitching state obtaining module 1101 (which has a function corresponding to step 801) and a cancellation instruction executing module 1102 (which has a function corresponding to step 802).
The pitching state obtaining module 1101 is configured to obtain a pitching state of the blade correspondingly controlled by the pitch controller.
The cancellation instruction execution module 1102 is configured to exit the manual feathering state and execute automatic feathering operation on the blades correspondingly controlled by the pitch controller if the feathering state of the blades correspondingly controlled by the pitch controller is the manual feathering state and the pitch controller receives a cancellation instruction of the manual feathering state sent by the main controller of the wind turbine generator system.
In the embodiment of the invention, the variable pitch controller actively exits the manual opening state and executes automatic feathering operation on the blades correspondingly controlled by the variable pitch controller after the opening state of the blades correspondingly controlled is the manual opening state and receives a cancellation instruction of the manual opening state sent by the main controller, so that the wind power received by the blades is reduced, the rotating speed of the wind generating set is reduced, the emergency treatment of abnormal overspeed of the wind generating set in the manual opening state is completed by matching with the main controller, and the safe operation of the wind generating set is ensured.
Embodiments of the present invention further provide a computer device, on which a program is stored, and when the program is executed by a processor, the method for controlling blade feathering as described above is implemented.
An embodiment of the present invention further provides a storage medium, on which a program is stored, and the program, when executed by a processor, implements the blade feathering 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 (10)
1. A blade feathering control method for a main controller of a wind turbine generator system, the method comprising:
receiving a pitching state sent by a variable pitch controller of n blades of the wind generating set, wherein n is an integer greater than or equal to 2;
if the opening states of the n blades are all manual opening states, determining the actual rotating speed of the wind generating set;
if the actual rotating speed is greater than a first preset rotating speed, a cancellation instruction of the manual feathering state is sent to the variable pitch controllers of the n blades respectively so that the n blades can execute automatic feathering operation, wherein the first preset rotating speed is less than the rated rotating speed of the wind generating set.
2. The method of claim 1, wherein after the step of determining the actual rotational speed of the wind turbine generator set, the method further comprises:
if the actual rotating speed is greater than the first preset rotating speed and the impeller locking pin of the wind generating set is withdrawn, cancelling instructions of the manual starting state are sent to the variable pitch controllers of the n blades respectively, so that the n blades execute automatic feathering operation.
3. Method according to claim 1, characterized in that the deactivating command is a pulse signal and/or that the first preset rotation speed is greater than a minimum stable rotation speed at which the rotation speed is measured.
4. The method according to claim 1, wherein after the step of sending the cancellation instruction of the manual pitching state to the pitch controllers of the n blades, respectively, the method further comprises:
if the actual rotating speed is less than a second preset rotating speed and at least two of the n blades are retracted to a preset safe pitch angle, stopping sending the canceling instruction and controlling the wind generating set to brake;
wherein the second preset rotating speed is less than the first preset rotating speed.
5. The method of claim 4,
the second preset rotating speed is greater than the minimum stable rotating speed during rotating speed measurement.
6. A blade feathering control method for a pitch controller of a wind generating set, characterized in that the method comprises the following steps:
obtaining the opening state of the blade correspondingly controlled by the variable pitch controller;
and if the opening state of the blade correspondingly controlled by the variable pitch controller is a manual opening state and a cancel instruction of the manual opening state sent by a main controller of the wind generating set is received, exiting the manual opening state and executing automatic feathering operation on the blade correspondingly controlled by the variable pitch controller.
7. A main controller of a wind generating set, comprising:
the pitching state receiving module is used for receiving a pitching state sent by a pitching controller of n blades of the wind generating set, wherein n is an integer greater than or equal to 2;
the actual rotating speed determining module is used for determining the actual rotating speed of the wind generating set if all the n blades are in the manual opening state;
and the cancellation instruction sending module is used for sending a cancellation instruction of the manual feathering state to the pitch controllers of the n blades respectively if the actual rotating speed is greater than a first preset rotating speed so as to enable the n blades to execute automatic feathering operation, wherein the first preset rotating speed is less than the rated rotating speed of the wind generating set.
8. A pitch controller of a wind generating set, comprising:
the pitching state obtaining module is used for obtaining the pitching state of the blade correspondingly controlled by the pitch controller;
and the cancellation instruction execution module is used for exiting the manual feathering state and executing automatic feathering operation on the blades correspondingly controlled by the variable pitch controller if the feathering state of the blades correspondingly controlled by the variable pitch controller is the manual feathering state and the variable pitch controller receives a cancellation instruction of the manual feathering state sent by a main controller of the wind generating set.
9. A computer device having a program stored thereon, wherein the program when executed by a processor implements a blade feathering control method as claimed in any one of claims 1-5 or a blade feathering control method as claimed in claim 6.
10. A storage medium having a program stored thereon, wherein the program when executed by a processor implements a blade feathering control method as claimed in any one of claims 1-5 or a blade feathering control method as claimed in claim 6.
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| CN112128053B (en) | 2022-06-21 |
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