CN109441721B - Auxiliary control method and device for reducing fan load under gust wind condition and fan controller - Google Patents
Auxiliary control method and device for reducing fan load under gust wind condition and fan 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
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- 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
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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
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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
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Abstract
The invention provides an auxiliary control method and device for reducing fan load under gust wind conditions and a fan controller, and relates to the technical field of wind power generation. The method comprises the following steps: judging whether gust occurs according to the rotating speed acceleration; when wind gusts occur, the variable pitch rate is calculated according to the aerodynamic resultant moment of the fan and the aerodynamic characteristics of the blades; and regulating and controlling the blades according to the variable pitch rate. The rotating speed acceleration of the fan is selected as a threshold variable for judging the occurrence of wind gust, and the threshold values under different wind speeds are obtained through comprehensive calculation according to variables such as the operating power and the pitch angle of the fan, so that the possibility of missed judgment and erroneous judgment can be reduced to the maximum extent. Meanwhile, the air torque represents the change intensity of the wind speed of the gust, and the pitch angle command is output according to the air torque control; the control process reduces time delay, the response is more sensitive, the control is more timely and effective, the pitch angle control process of the intervention or quitting of normal power generation is smoother, and the influence on the normally running pitch angle is smaller.
Description
Technical Field
The invention relates to the technical field of wind power generation, in particular to an auxiliary control method and device for reducing fan load under gust wind conditions and a fan controller.
Background
The method has the defects that the wind speed measurement is inaccurate based on the prior art, the wind speed change is irregular, the prediction is inaccurate, the misjudgment and the omission of the judgment can be caused, the control effect is influenced, and the safety of the fan is threatened.
In addition, the other method is to use the average wind speed and the average pitch angle in a period of time to carry out limit control on the pitch angle of the fan, for example, the method has the defects that the average value of measured variables is used as a judgment standard, which is just an empirical judgment and lacks of theoretical support, and meanwhile, the control delay and the control effect are poor due to the calculation of the average value.
The other method is to control according to the rotating speed change rate, and to control the torque in an addition and subtraction mode when the rotating speed change rate is larger than a threshold value.
Disclosure of Invention
In view of this, an embodiment of the present invention provides an auxiliary control method and device for reducing a fan load under a gust condition, and a fan controller, so as to improve a control effect of an existing fan under the gust condition and a fan safety problem caused by the gust.
The technical scheme adopted by the invention is as follows:
the embodiment of the invention provides an auxiliary control method for reducing the load of a fan under a gust wind condition, which comprises the following steps: judging whether gust occurs; when wind gusts occur, the variable pitch rate is calculated according to the aerodynamic resultant moment borne by the wind wheel of the fan and the aerodynamic characteristics of the fan blades; controlling the blades of the wind turbine according to the pitch rate, comprising: calculating overspeed risk gain according to the rotating speed and the rotating speed acceleration of the fan and a preset rotating speed upper limit value; calculating to obtain a variable pitch speed instruction according to the overspeed risk gain and the variable pitch speed; and controlling the blades of the fan according to the variable pitch speed instruction.
Further, the step of judging whether the gust occurs includes: acquiring an acceleration threshold value of the rotating speed of the fan when gust occurs according to the pitch angle or power of the fan; and judging that gust occurs when the rotating speed acceleration of the fan is greater than the acceleration threshold value.
Further, before the step of calculating the pitch rate according to the aerodynamic resultant moment borne by the wind wheel of the fan and the aerodynamic characteristics of the fan blades, the method further includes: and calculating to obtain the pneumatic resultant moment acting on the wind wheel of the fan based on the rotating speed acceleration of the fan and the rotating inertia of the wind wheel of the fan.
Further, the step of calculating the overspeed risk gain according to the rotating speed, the rotating speed acceleration and the preset rotating speed upper limit of the fan comprises:
according to the formula
Calculating overspeedRisk gain, where ω refers to the rotational speed of the fan,
speed acceleration, omega, of a fanmaxMeans a predetermined upper limit value of the rotational speed, KθRefers to overspeed risk gain.
The invention also provides a gust wind condition reduction fan load auxiliary control device, which is used for executing the gust wind condition reduction fan load auxiliary control method and comprises the following steps:
the judging module is used for judging whether gust occurs or not;
the calculation module is used for calculating the variable pitch rate according to the aerodynamic resultant moment borne by the wind wheel of the fan and the aerodynamic characteristics of the fan blades when wind gusts occur;
a control module for controlling the blades of the wind turbine in accordance with the pitch rate, the control module comprising: the first calculation unit is used for calculating overspeed risk gain according to the rotating speed and the rotating speed acceleration of the fan and a preset rotating speed upper limit value; the second calculation unit is used for calculating to obtain a variable pitch rate instruction according to the overspeed risk gain and the variable pitch rate; and the control unit is used for controlling the blades of the fan according to the variable pitch speed instruction.
Further, the judging module comprises: the acquiring unit is used for acquiring an acceleration threshold value of the rotating speed of the fan when wind gusts occur according to the pitch angle or the power of the fan;
and the judging unit is used for judging that gust occurs when the rotating speed acceleration of the fan is greater than the acceleration threshold value.
Further, the calculation module is used for calculating and obtaining the pneumatic resultant moment acting on the wind wheel of the fan based on the rotational speed acceleration of the fan and the rotational inertia of the wind wheel of the fan, and is also used for calculating and obtaining the pitch variation rate according to the pneumatic resultant moment acting on the wind wheel of the fan and the pneumatic characteristics of the blades of the fan.
The invention also provides a fan controller, which comprises a memory; a controller; and a gust wind condition reduction fan load assist control device mounted to the memory and including one or more software function modules executable by the controller, the gust wind condition reduction fan load assist control device comprising: the judging module is used for judging whether gust occurs or not; the calculation module is used for calculating the variable pitch rate according to the aerodynamic resultant moment borne by the wind wheel of the fan and the aerodynamic characteristics of the fan blades when wind gusts occur; a control module for controlling the blades of the wind turbine in accordance with the pitch rate, the control module comprising: the first calculation unit is used for calculating overspeed risk gain according to the rotating speed and the rotating speed acceleration of the fan and a preset rotating speed upper limit value; the second calculation unit is used for calculating to obtain a variable pitch rate instruction according to the overspeed risk gain and the variable pitch rate; and the control unit is used for controlling the blades of the fan according to the variable pitch speed instruction.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides an auxiliary control method and device for reducing the load of a fan under gust wind conditions and a fan controller, wherein the auxiliary control method for reducing the load of the fan under gust wind conditions comprises the following steps: judging whether wind gusts occur or not according to whether the rotating speed acceleration reaches an acceleration threshold value or not; when wind gusts occur, the variable pitch rate is calculated according to the aerodynamic resultant moment borne by the wind wheel of the fan and the aerodynamic characteristics of the fan blades; and calculating overspeed risk gain of the fan, and calculating to obtain a variable pitch rate instruction according to the risk gain and the variable pitch rate to control the blades of the fan. The rotating speed acceleration of the fan is selected as a threshold variable for judging the occurrence of wind gust, and the threshold values under different wind speeds are obtained through comprehensive calculation according to variables such as the operating power and the pitch angle of the fan, so that the possibility of missed judgment and erroneous judgment can be reduced to the maximum extent. Meanwhile, the air torque as the control input directly represents the change intensity of the wind speed of the gust, and the control output is a pitch angle instruction directly given according to the aerodynamic characteristics of the blades; the control process reduces time delay, the response is more sensitive, the control is more timely and effective, the pitch angle control process of the intervention or quitting of normal power generation is smoother, and the influence on the normal pitch angle is smaller.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 shows a schematic diagram of a fan controller according to the present invention.
FIG. 2 is a flow chart of an auxiliary control method for reducing the load of a wind turbine during gust wind conditions.
Fig. 3 shows a flow chart of sub-steps of step S10 in fig. 2.
Fig. 4 shows a flow chart of the substeps of step 30.
Fig. 5 shows a functional module schematic diagram of the auxiliary control device for reducing the load of the wind turbine during gust wind conditions.
Fig. 6 shows a schematic diagram of functional units of the determining module provided by the present invention.
Fig. 7 shows a functional unit diagram of a control module provided by the present invention.
Icon: 100-a fan controller; 101-a memory; 102-a memory controller; 103-a processor; 104-peripheral interfaces; 105-a display unit; 106-input-output unit; 200-wind gust condition reduction fan load auxiliary control device; 210-a judgment module; 211-an acquisition unit; 212-a judging unit; 220-a calculation module; 230-a control module; 231-a first calculation unit; 232-a second calculation unit; 233-control unit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should also be noted that relational terms such as first and second, and the like, may be used solely herein to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
Fig. 1 is a block diagram of a fan controller 100 according to a preferred embodiment of the present invention. The fan controller 100 may be an industrial personal computer, a mainframe computer, or the like. The wind turbine controller 100 comprises a gust wind condition reduction wind turbine load auxiliary control device 200, a memory 101, a storage controller 102, a processor 103, a peripheral interface 104, a display unit 105 and an input/output unit 106.
The memory 101, the memory controller 102, the processor 103, the peripheral interface 104, the display unit 105, and the input/output unit 106 are electrically connected to each other directly or indirectly to implement data transmission or interaction. For example, the components may be electrically connected to each other via one or more communication buses or signal lines. The gust wind condition reduction fan load assist control apparatus 200 includes at least one software function module that may be stored in the memory 101 in the form of software or firmware (firmware) or solidified in an Operating System (OS) of the fan controller 100. The processor 103 is configured to execute executable modules stored in the memory 101, such as software functional modules or computer programs included in the gust reduction fan load assist control apparatus 200.
The Memory 101 may be, but is not limited to, a Random Access Memory (RAM), a Read Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Read-Only Memory (EPROM), an electrically Erasable Read-Only Memory (EEPROM), and the like. The memory 101 is used for storing a program, and the processor 103 executes the program after receiving an execution instruction, and the method executed by the process-defined server disclosed by any embodiment of the invention can be applied to the processor 103, or implemented by the processor 103.
The processor 103 may be an integrated circuit chip having signal processing capabilities. The Processor 103 may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; but may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor 103 may be any conventional processor 103 or the like.
The peripheral interface 104 couples various input/output devices to the processor 103 as well as to the memory 101. In some embodiments, the peripheral interface 104, the processor 103, and the memory controller 102 may be implemented in a single chip. In other examples, they may be implemented separately from the individual chips.
The display unit 105 provides an interactive interface (e.g., a user interface) between the fan controller 100 and a user or for displaying image data for user reference. In this embodiment, the display unit 105 may be a liquid crystal display or a touch display. The input/output unit 106 is used for providing input data for a user to realize the interaction of the user and the fan controller 100. For example, the method can be used for testing historical data of fan rotating speed, rotating speed acceleration and the like input by a user. The input/output unit 106 may be, but is not limited to, a mouse, a keyboard, etc., and the keyboard may be a virtual keyboard.
First embodiment
Referring to fig. 2, the present embodiment provides an auxiliary control method for reducing a load of a wind turbine during a wind gust condition, where the auxiliary control method is used to adjust a pitch angle rate of the wind turbine during the wind gust condition, so as to prevent the wind turbine from being dangerous during the wind gust condition. The auxiliary control method for reducing the load of the fan under the gust condition comprises the step S10-step S30.
Step S10: and judging whether the gust occurs.
Before adjusting the fan, whether a gust occurs is judged first. The method has the defects that the wind speed measurement is inaccurate based on the prior art, the wind speed change is irregular, the prediction is inaccurate, the misjudgment and the omission of the judgment can be caused, the control effect is influenced, and the safety of the fan is threatened.
In the embodiment of the invention, the occurrence or occurrence of the gust is judged by adopting the rotating speed acceleration threshold value. The method is characterized in that the acceleration of the fan is inevitably increased when the gust occurs, but the acceleration values generated by different gusts are different under different wind speeds, different powers of the fan and different pitch angles, and in order to accurately judge the generation of the gust, the method carries out big data analysis and statistics according to the power, the pitch angles and the fan acceleration data in the normal power generation and gust process of the fan which are recorded in advance to obtain the change rule of the fan acceleration threshold value along with the power and the pitch angles, so that the fan rotation speed acceleration threshold value when the gust occurs is accurately calculated in real time.
Preferably, referring to fig. 3, step S10 includes: step S101 to step S103.
Step S101: and obtaining the acceleration threshold value of the rotating speed of the fan when wind gusts occur according to the pitch angle or the power of the fan.
And carrying out big data analysis and statistics according to the power, the pitch angle and the fan acceleration data in the process of normal power generation and wind gust of the fan which are recorded in advance to obtain the change rule of the fan acceleration threshold value along with the power and the pitch angle for judging the occurrence of the wind gust, so that the acceleration threshold value of the fan rotating speed when the wind gust occurs is obtained according to the pitch angle or the power of the fan.
Step S102: and acquiring the rotating speed acceleration of the fan.
Firstly, the rotating speed of the fan during operation is obtained, and the rotating speed acceleration of the fan is obtained through calculation according to the speed of the fan.
Step S103: and comparing the acquired rotating speed acceleration of the fan with a preset acceleration threshold.
And comparing the rotating speed acceleration of the fan obtained by calculation with a preset acceleration threshold, and in the embodiment, judging that wind gust occurs when the rotating speed acceleration of the fan is greater than the acceleration threshold.
It should be noted that, in the present embodiment, before the step S20, the method includes a step S110.
Step S110: and calculating to obtain the pneumatic resultant moment acting on the wind wheel of the fan based on the rotating speed acceleration of the fan and the rotating inertia of the wind wheel of the fan.
Preferably, the rotational speed acceleration is obtained by calculating the rotational speed of the fan, and the rotational speed acceleration of the fan and the rotational inertia of the wind wheel are calculated according to a formula:
Step S20: and calculating to obtain the pitch variation rate according to the aerodynamic resultant moment borne by the wind wheel of the fan and the aerodynamic characteristics of the fan blade.
When gust occurs, the fan needs to be regulated and controlled, and the motor is prevented from being damaged by wind power. In this embodiment, the adjustment amount is calculated according to the aerodynamic resultant moment received by the wind wheel of the fan and the aerodynamic characteristics of the fan blade to adjust and control the fan blade.
In this embodiment, the required pitch rate of the control fan is obtained by using the aerodynamic characteristics of the wind turbine blades and the resultant torque of the rotational torque acting on the wind wheel.
According to the formula:
wherein, Δ θ refers to the calculated pitch rate, Δ T is the resultant moment acting on the wind wheel of the wind turbine, and dTorque/dPitch refers to the aerodynamic characteristics of the wind turbine blades.
It should be noted that, in this embodiment, the pitch rate required by the fan is calculated according to the aerodynamic characteristics of the blades and the received aerodynamic moment, and in the actual use process, the resultant moment received by the wind wheel may be replaced by the rotational speed acceleration, and the resultant moment received by the wind wheel may be used
To characterize the aerodynamic properties of the blade.
Step S30: and controlling the blades of the fan according to the variable pitch rate.
And regulating and controlling the fan based on the calculated variable pitch rate, specifically regulating and controlling parameters such as the pitch angle of the blades of the fan. So as to prevent the fan from being damaged due to the increase of the load of the fan caused by gust.
In the present embodiment, referring to fig. 4, step S30 includes the following substeps 301-step S303.
Step S301: and calculating overspeed risk gain according to the rotating speed and the rotating speed acceleration of the fan and a preset rotating speed upper limit value.
In this embodiment, the pitch rate is multiplied by a gain before being added to the pitch control command for normal power generation, and the overspeed risk gain is calculated according to the current overspeed risk. Specifically, according to the rotating speed and the rotating speed acceleration of the fan and a preset rotating speed upper limit value, according to a formula:
Step S302: and calculating to obtain a pitch rate instruction according to the overspeed risk gain and the pitch rate.
In this embodiment, the pitch rate command is obtained by multiplying the pitch rate Δ θ by the overspeed risk gain K calculated in the calculationθThus obtaining the product.
Step S303: and controlling the blades of the fan according to the variable pitch speed instruction.
According to the calculated pitch rate instruction, the blades of the fan are regulated, in the embodiment, the weight coefficient of the control instruction used for regulation, namely the additional pitch angle instruction is different along with the strength of the gust and the overspeed danger degree of the wind wheel, the pitch angle control process of the control instruction, namely the additional pitch angle instruction, is smooth when the control instruction intervenes or quits the normal power generation, and the influence on the normal pitch angle is small. In the present embodiment, the control command to be output is a pitch angle rate command, but may be replaced with a pitch angle position command.
Second embodiment
The present embodiment provides a gust wind condition reduction fan load assist control device 200, and the gust wind condition reduction fan load assist control device 200 is used for executing the gust wind condition reduction fan load assist control method provided in the first embodiment.
It should be noted that the basic principle of the auxiliary control device 200 for reducing the load of the wind turbine during the gust condition provided by the present embodiment is substantially the same as that of the hierarchical control method provided by the first embodiment, and for the sake of brief description, the present embodiment will not be described in detail, and the related contents in the first embodiment are referred to in this embodiment without elaboration.
Referring to fig. 5, the auxiliary control device 200 for reducing the load of the wind turbine during the gust condition includes: a judging module 210, a calculating module 220 and a control module 230.
And the judging module 210 is used for judging whether a gust occurs.
It is understood that the determining module 210 can be used to execute the step S10.
Referring to fig. 6, the determining module 210 includes: an acquisition unit 211 and a determination unit 212.
The acquiring unit 211 is configured to acquire an acceleration threshold of the rotational speed of the wind turbine when wind gusts occur according to the pitch angle or power of the wind turbine; preferably, big data analysis and statistics are carried out according to the power, the pitch angle and the fan acceleration data in the process of normal power generation and wind gust of the fan which are recorded in advance, so that the change rule of the fan acceleration threshold value along with the power and the pitch angle for judging the occurrence of the wind gust is obtained, and the acceleration threshold value of the fan rotating speed when the wind gust occurs is obtained according to the pitch angle or the power of the fan.
The obtaining unit 211 is further configured to obtain a rotational speed acceleration of the fan. Firstly, the rotating speed of the fan during operation is obtained, and the rotating speed acceleration of the fan is obtained through calculation according to the speed of the fan.
It is understood that the obtaining unit 211 may be configured to perform step S101 and step S102.
And the judging unit 212 is used for judging that wind gust occurs when the rotating speed acceleration of the fan is greater than the acceleration threshold value. Preferably, the calculated rotating speed acceleration of the fan is compared with a preset acceleration threshold, and in this embodiment, it is determined that a wind gust occurs when the rotating speed acceleration of the fan is greater than the acceleration threshold.
It is understood that the determining unit 212 may be used to execute step S103.
And the calculating module 220 is used for calculating the pitch variation rate according to the aerodynamic resultant moment borne by the wind wheel of the fan and the aerodynamic characteristics of the fan blade when wind gusts occur.
The calculation module 220 is configured to calculate and obtain a pneumatic resultant moment acting on the wind wheel of the wind turbine based on the rotational acceleration of the wind turbine and the rotational inertia of the wind wheel of the wind turbine, and calculate and obtain a pitch rate according to the pneumatic resultant moment acting on the wind wheel of the wind turbine and the pneumatic characteristics of the blades of the wind turbine.
It is understood that the calculation module 220 may be used to execute step S110 and step S20.
And a control module 230, configured to control the blades of the wind turbine according to the pitch rate.
It is understood that the control module 230 may be configured to perform step S30.
In the present embodiment, referring to fig. 7, the control module 230 includes a first calculating unit 231, a second calculating unit 232 and a control unit 233.
The first calculating unit 231 is configured to calculate an overspeed risk gain according to the rotation speed, the rotation speed acceleration, and a preset rotation speed upper limit of the fan.
In this embodiment, the pitch rate is multiplied by a gain before being added to the pitch control command for normal power generation, and the overspeed risk gain is calculated according to the current overspeed risk. Specifically, according to the rotating speed and the rotating speed acceleration of the fan and a preset rotating speed upper limit value, according to a formula:
It is to be understood that the first calculation unit 231 may be configured to perform step S301.
And a second calculating unit 232, configured to calculate a pitch rate instruction according to the overspeed risk gain and the pitch rate.
It is to be understood that the second calculation unit 232 may be configured to perform step S302.
And a control unit 233 for controlling the blades of the wind turbine according to the pitch rate command.
It is to be understood that the control unit 233 may be configured to perform step S303.
In summary, the auxiliary control method, the auxiliary control device and the fan controller for reducing the fan load under the gust wind condition provided by the present invention include: judging whether wind gusts occur or not according to whether the rotating speed acceleration reaches an acceleration threshold value or not; when wind gusts occur, the variable pitch rate is calculated according to the aerodynamic resultant moment borne by the wind wheel of the fan and the aerodynamic characteristics of the fan blades; and controlling the blades of the fan according to the variable pitch rate. The rotating speed acceleration of the fan is selected as a threshold variable for judging the occurrence of wind gust, and the threshold values under different wind speeds are obtained through comprehensive calculation according to variables such as the operating power and the pitch angle of the fan, so that the possibility of missed judgment and erroneous judgment can be reduced to the maximum extent. Meanwhile, the air torque as the control input directly represents the change intensity of the wind speed of the gust, and the control output is a pitch angle instruction directly given according to the aerodynamic characteristics of the blades; the control process reduces time delay, the response is more sensitive, the control is more timely and effective, the pitch angle control process of the intervention or quitting of normal power generation is smoother, and the influence on the normal pitch angle is smaller. When the fan is regulated and controlled, the influence on the normal operation of the fan is avoided.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, 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.
In addition, the functional modules in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. The auxiliary control method for reducing the load of the fan under the condition of gust wind is characterized by comprising the following steps of:
judging whether gust occurs;
when wind gusts occur, the variable pitch rate is calculated according to the aerodynamic resultant moment borne by the wind wheel of the fan and the aerodynamic characteristics of the fan blades;
controlling the blades of the wind turbine according to the pitch rate, comprising:
calculating overspeed risk gain according to the rotating speed and the rotating speed acceleration of the fan and a preset rotating speed upper limit value;
calculating to obtain a variable pitch speed instruction according to the overspeed risk gain and the variable pitch speed;
and controlling the blades of the fan according to the variable pitch speed instruction.
2. The method of claim 1, wherein the step of determining whether the wind gust occurs comprises:
acquiring an acceleration threshold value of the rotating speed of the fan when gust occurs according to the pitch angle or power of the fan;
and judging that gust occurs when the rotating speed acceleration of the fan is greater than the acceleration threshold value.
3. The method for assisting in controlling the load of a wind turbine generator during a gust condition according to claim 1, wherein before the step of calculating the pitch rate according to the aerodynamic resultant moment applied to the rotor of the wind turbine generator and the aerodynamic characteristics of the blades of the wind turbine generator, the method further comprises:
and calculating to obtain the pneumatic resultant moment acting on the wind wheel of the fan based on the rotating speed acceleration of the fan and the rotating inertia of the wind wheel of the fan.
4. The method as claimed in claim 1, wherein the step of calculating the overspeed risk gain according to the rotational speed, the rotational speed acceleration and the preset upper rotational speed limit of the wind turbine includes:
according to the formula
Calculating an overspeed risk gain, wherein ω refers to the rotational speed of the fan,speed acceleration, omega, of a fanmaxMeans a predetermined upper limit value of the rotational speed, KθRefers to overspeed risk gain.
5. An auxiliary control device for reducing the load of a wind gust condition fan, which is used for executing the auxiliary control method for reducing the load of the wind gust condition fan according to any one of claims 1 to 4, and comprises:
the judging module is used for judging whether gust occurs or not;
the calculation module is used for calculating the variable pitch rate according to the aerodynamic resultant moment borne by the wind wheel of the fan and the aerodynamic characteristics of the fan blades when wind gusts occur;
a control module for controlling the blades of the wind turbine in accordance with the pitch rate, the control module comprising:
the first calculation unit is used for calculating overspeed risk gain according to the rotating speed and the rotating speed acceleration of the fan and a preset rotating speed upper limit value;
the second calculation unit is used for calculating to obtain a variable pitch rate instruction according to the overspeed risk gain and the variable pitch rate;
and the control unit is used for controlling the blades of the fan according to the variable pitch speed instruction.
6. The gust wind condition reduction fan load assist control apparatus of claim 5, wherein the determination module comprises:
the acquiring unit is used for acquiring an acceleration threshold value of the rotating speed of the fan when wind gusts occur according to the pitch angle or the power of the fan;
and the judging unit is used for judging that gust occurs when the rotating speed acceleration of the fan is greater than the acceleration threshold value.
7. The auxiliary control device for reducing the load of the wind turbine according to claim 5, wherein the calculation module is configured to calculate and obtain a pneumatic resultant moment acting on the wind wheel of the wind turbine based on the rotational acceleration of the wind turbine and the rotational inertia of the wind wheel of the wind turbine, and calculate and obtain the pitch rate according to the pneumatic resultant moment acting on the wind wheel of the wind turbine and the pneumatic characteristics of the blades of the wind turbine.
8. A fan controller, characterized in that the fan controller comprises a memory; a controller; and a gust wind condition reduction fan load assist control device mounted to the memory and including one or more software function modules executable by the controller, the gust wind condition reduction fan load assist control device comprising:
the judging module is used for judging whether gust occurs or not;
the calculation module is used for calculating the variable pitch rate according to the aerodynamic resultant moment borne by the wind wheel of the fan and the aerodynamic characteristics of the fan blades when wind gusts occur;
a control module for controlling the blades of the wind turbine in accordance with the pitch rate, the control module comprising:
the first calculation unit is used for calculating overspeed risk gain according to the rotating speed and the rotating speed acceleration of the fan and a preset rotating speed upper limit value;
the second calculation unit is used for calculating to obtain a variable pitch rate instruction according to the overspeed risk gain and the variable pitch rate;
and the control unit is used for controlling the blades of the fan according to the variable pitch speed instruction.
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| CN201811264919.6A CN109441721B (en) | 2018-10-26 | 2018-10-26 | Auxiliary control method and device for reducing fan load under gust wind condition and fan controller |
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| CN201811264919.6A CN109441721B (en) | 2018-10-26 | 2018-10-26 | Auxiliary control method and device for reducing fan load under gust wind condition and fan controller |
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| US12129829B2 (en) | 2021-03-08 | 2024-10-29 | Goldwind Science & Technology Co., Ltd. | Control method and control device for wind turbine |
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| CN113048019B (en) * | 2019-12-27 | 2022-08-09 | 北京金风科创风电设备有限公司 | Gust detection method, gust controller and wind power generation system |
| CN111075651B (en) * | 2020-01-03 | 2021-05-28 | 国电联合动力技术有限公司 | Limit load reduction method and system for wind turbine generator |
| CN111396249B (en) * | 2020-03-31 | 2022-08-30 | 新疆金风科技股份有限公司 | Method and device for reducing tower load under gust wind condition |
| CN113740931B (en) * | 2020-05-29 | 2023-12-22 | 金风科技股份有限公司 | Wind array detection method and device for wind generating set |
| CN113931806B (en) * | 2020-06-29 | 2023-09-22 | 金风科技股份有限公司 | Wind generating set, control method, controller and control system thereof |
| CN112879218A (en) * | 2021-01-25 | 2021-06-01 | 三一重能股份有限公司 | Fan blade angle adjusting method and device, storage medium and electronic equipment |
| CN112855434B (en) * | 2021-01-29 | 2022-04-01 | 三一重能股份有限公司 | Control method and device for wind turbine generator blade, electronic equipment and storage medium |
| CN112796943B (en) * | 2021-03-26 | 2022-03-01 | 中国华能集团清洁能源技术研究院有限公司 | Operation control method and system for wind turbine generator set under extreme wind power condition |
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Address after: 102206 31 Industrial Park, North Qing Road, Beijing, Changping District Patentee after: Sany Heavy Energy Co., Ltd Address before: 102206 31 Industrial Park, North Qing Road, Beijing, Changping District Patentee before: SANY HEAVY ENERGY Co.,Ltd. |