CN117052593A - Load shedding method and system for wind generating set and computer readable storage medium - Google Patents
Load shedding method and system for wind generating set and computer readable storage medium Download PDFInfo
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- CN117052593A CN117052593A CN202210489683.6A CN202210489683A CN117052593A CN 117052593 A CN117052593 A CN 117052593A CN 202210489683 A CN202210489683 A CN 202210489683A CN 117052593 A CN117052593 A CN 117052593A
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- 230000008859 change Effects 0.000 claims abstract description 55
- 230000009467 reduction Effects 0.000 claims abstract description 22
- 230000008569 process Effects 0.000 claims abstract description 6
- 238000004088 simulation Methods 0.000 claims description 4
- 238000004378 air conditioning Methods 0.000 claims 3
- 230000000630 rising effect Effects 0.000 claims 1
- 238000010248 power generation Methods 0.000 description 7
- 230000009471 action Effects 0.000 description 5
- 238000005070 sampling Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 230000001960 triggered effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
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- 238000007796 conventional method Methods 0.000 description 1
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- 239000003208 petroleum Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2260/00—Function
- F05B2260/70—Adjusting of angle of incidence or attack of rotating blades
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- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Wind Motors (AREA)
Abstract
The embodiment of the invention provides a load reduction method of a wind generating set, a system thereof and a computer readable storage medium. The method comprises the following steps: acquiring a value of a variable representing the wind speed and a value of a change rate of the variable in the running process of the wind generating set; obtaining a pitch angle value of the wind generating set according to the values of the variables and the change rates of the variables and based on the corresponding relation between the variable and the change rates of the variables and the pitch angle; and determining a final pitch angle given value of the wind generating set based on a preset pitch angle set value of the wind generating set and the obtained pitch angle value so as to achieve load shedding. The embodiment of the invention can achieve load reduction and hardly lose the generated energy.
Description
Technical Field
The embodiment of the invention relates to the technical field of wind power generation, in particular to a load reduction method of a wind generating set, a system thereof and a computer readable storage medium.
Background
Along with the gradual exhaustion of energy sources such as coal, petroleum and the like, people pay more attention to the utilization of renewable energy sources. Wind energy is becoming increasingly important worldwide as a clean renewable energy source. With the continuous development of wind power technology, wind power generation sets are increasingly applied to power systems. Wind power generation sets are large-scale devices that convert wind energy into electrical energy, and are typically located in areas where wind energy resources are abundant.
At present, the control scheme of the conventional wind generating set is as follows: at a low wind speed, the pitch angle is set as an optimal pitch angle, and the rotating speed of the wind wheel is in direct proportion to the wind speed by adjusting the torque so as to maintain an optimal tip speed ratio, thereby capturing the maximum wind energy; after the rotational speed of the wind wheel reaches the rated speed, the rotational speed of the wind wheel is stabilized near the rated speed by adjusting the torque; the wind speed continues to increase, the torque is not changed after the power reaches the rated power, and the rotating speed and the power of the wind wheel are maintained near the rated power by adjusting the pitch angle. Due to the inherent characteristics of wind power generators, wind power generators can be subjected to large structural loads when gusts occur, particularly when wind speeds rapidly rise from below the rated speed to above the rated speed.
In order to reduce the loads of parts such as blade roots, hubs, tower drums and the like under the gust condition, and therefore the cost is reduced, the conventional method generally adopts a scheme of triggering a rapid feathering action according to a rotating speed change rate, a rotating speed error and a pitch angle signal, namely when the product of the rotating speed change rate and the rotating speed error exceeds a certain threshold value, an extra constant increment is added to the pitch speed, and the triggering threshold value is obtained by looking up a table according to the pitch angle.
However, the above solution for reducing the load has problems in that: when the wind speed rises rapidly below the rated value, the existing strategy triggers late and even cannot trigger, so that the purpose of load reduction cannot be achieved. The reason for this problem is that: the pitch angle may only be operated if the rotational speed exceeds the nominal value sufficiently and the rotational speed ramp-up rate is sufficiently high that the power reaches near nominal. However, when the rated power is lower than the rated power, the rotational speed of the wind wheel does not rise rapidly even if the wind speed increases rapidly due to the restraining effect of the torque on the rotational speed, and thus the threshold value for triggering the additional pitching operation cannot be reached. If the trigger threshold is lowered, frequent triggering can be performed under normal power generation conditions, so that the wind generating set cannot stably operate, and more generated energy can be lost.
Disclosure of Invention
The embodiment of the invention aims to provide a load reduction method and system for a wind generating set and a computer readable storage medium, which can achieve load reduction and hardly lose generated energy.
One aspect of the embodiment of the invention provides a load reduction method of a wind generating set. The method comprises the following steps: in the running process of the wind generating set, acquiring the value of a variable representing the wind speed and the value of the change rate of the variable; obtaining a pitch angle value of the wind generating set according to the values of the variables and the change rates of the variables and based on the corresponding relations between the variables and the change rates of the variables and the pitch angles; and determining a final pitch angle given value of the wind generating set based on the preset pitch angle set value of the wind generating set and the obtained pitch angle value so as to achieve load shedding.
Another aspect of the embodiment of the invention also provides a load reduction system of the wind generating set. The load shedding system of the wind generating set comprises one or more processors, and the processor is used for realizing the load shedding method of the wind generating set.
Yet another aspect of an embodiment of the present invention provides a computer-readable storage medium. The computer readable storage medium stores a program which, when executed by a processor, implements the load shedding method of the wind turbine generator set as described above.
According to the load reducing method, the load reducing system and the computer readable storage medium of the wind generating set, when the wind speed rises rapidly from below the rated value, the wind generating set can reduce the loads of large parts such as blade roots, hubs and tower drums through pitch variation, and the pitch variation action is seldom triggered under the normal power generation condition, so that the load and the cost are reduced, and the power generation capacity is hardly lost.
Drawings
FIG. 1 is a flow chart of a method of load shedding of a wind turbine generator system according to an embodiment of the present invention;
FIG. 2 is a graph comparing simulation results of load shedding methods of wind turbine generators of embodiments of the present invention with and without a model;
FIG. 3 is a schematic block diagram of a load shedding system of a wind turbine generator system according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus consistent with aspects of the invention as detailed in the accompanying claims.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Unless defined otherwise, technical or scientific terms used in the embodiments of the present invention should be given the ordinary meaning as understood by one of ordinary skill in the art to which the present invention belongs. The terms first, second and the like in the description and in the claims, are not used for any order, quantity or importance, but are used for distinguishing between different elements. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. "plurality" or "plurality" means two or more. Unless otherwise indicated, the terms "front," "rear," "lower," and/or "upper" and the like are merely for convenience of description and are not limited to one location or one spatial orientation. The word "comprising" or "comprises", and the like, means that elements or items appearing before "comprising" or "comprising" are encompassed by the element or item recited after "comprising" or "comprising" and equivalents thereof, and that other elements or items are not excluded. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
The embodiment of the invention provides a load reduction method of a wind generating set. FIG. 1 discloses a flowchart of a method for load shedding of a wind turbine generator system according to an embodiment of the present invention. As shown in fig. 1, the load shedding method of the wind generating set according to an embodiment of the present invention may include steps S1 to S3.
In step S1, during operation of the wind park, values of the variable characterizing the wind speed and values of the rate of change of the variable may be obtained.
In some embodiments, the variable characterizing the wind speed may comprise a wind turbine surface equivalent average wind speed V of the wind park.
In this case, the acquiring of the value of the variable characterizing the wind speed and the value of the rate of change of the variable in step S1 may include: obtaining the value of the equivalent average wind speed V of the wind wheel surface and the change rate of the equivalent average wind speed of the wind wheel surfaceIs a value of (2).
Since the measured wind speed of a nacelle anemometer provided to the wind park is not representative of the average wind speed of the wind turbine surface, in one embodiment, a value for the average wind speed V of the wind turbine surface equivalent may be estimated based on the current rotational speed, the current torque and the current pitch angle of the wind park may be selected. For example, when the wind turbine is in an underdeveloped state, then the value of the wind turbine surface equivalent average wind speed V may be estimated based on the current rotational speed and the current torque of the wind turbine; and when the wind generating set is in a full power state, the value of the equivalent average wind speed V of the wind wheel surface can be estimated based on the current rotating speed and the current pitch angle of the wind generating set.
After the value of the wind wheel surface equivalent average wind speed V of the current sampling period is estimated, the wind wheel surface equivalent average wind speed V calculated in the previous sampling period can be subtracted according to the calculated value of the wind wheel surface equivalent average wind speed V of the current sampling period, so that the difference value of the wind wheel surface equivalent average wind speed V and the wind wheel surface equivalent average wind speed V is obtained, and the change rate of the variable in the sampling period can be obtained by dividing the difference value by the sampling period.
In other embodiments, the variable characterizing wind speed may include an output torque of the wind turbine.
In this case, the acquiring of the value of the variable characterizing the wind speed and the value of the rate of change of the variable in step S1 may include: the value of the output torque and the value of the change rate of the output torque are obtained.
In one embodiment, to obtain a smoother wind speed and a smoother change rate of the wind speed, the obtaining the values of the variables and the values of the change rates of the variables in step S1 may include: the average of the variable and the rate of change of the variable over a predetermined period of time (e.g., 0.5 seconds) is calculated.
In another embodiment, in order to make the wind speed up and down process have different dynamic characteristics, different moving average time constants can be taken for the two processes. Thus, during an increase in wind speed, the variable and the average value of the rate of change of the variable may be calculated for a first predetermined period of time; and during the wind speed reduction, calculating the average value of the variable and the change rate of the variable for a second predetermined time period, wherein the first predetermined time period is different from the second predetermined time period.
In step S2, a pitch angle value of the wind turbine generator system may be obtained from the values of the variables and the values of the rates of change of the variables obtained in step S1, and based on the variables and the correspondence between the rates of change of the variables and the pitch angle.
In some embodiments, step S2 of obtaining the pitch angle value of the wind turbine generator set according to the value of the variable and the value of the rate of change of the variable and based on the variable and the correspondence between the rate of change of the variable and the pitch angle may further include step S21 and step S22.
In step S21, the value of the product of the variable and the rate of change of the variable may be calculated from the value of the variable and the value of the rate of change of the variable.
In step S22, a corresponding pitch angle value may be obtained from the value of the product of the variable and the rate of change of the variable calculated in step S21 and based on the correspondence between the product of the variable and the rate of change of the variable and the pitch angle.
In some embodiments, the correspondence of the variable and the product of the rate of change of the variable to the pitch angle may include a lookup table of the variable and the product of the rate of change of the variable to the pitch angle. Therefore, the load reduction method of the wind generating set of the embodiment of the invention can further comprise the following steps: a lookup table of the product of the variable and the rate of change of the variable and the pitch angle is established in advance by simulation. For example, the bars of the lookup table may be set to the values of the product of the variable and the rate of change of the variable, while the columns of the lookup table may be set to the corresponding pitch angle values of the wind turbine generator set. Therefore, after calculating the value of the product of the variable and the rate of change of the variable, the corresponding pitch angle value can be easily obtained by referring to a look-up table of the product of the variable and the rate of change of the variable and the pitch angle.
In step S3, a final pitch angle setpoint of the wind turbine generator system may be determined based on a preset pitch angle setpoint of the wind turbine generator system and the obtained pitch angle value to achieve load shedding.
In some embodiments, the greater of the pitch angle set point and the resulting pitch angle value may be selected as the final pitch angle set point for the set wind turbine. Therefore, when the value of the product of the variable and the change rate of the variable exceeds the normal range, the pitching action can be triggered, so that the purpose of load reduction is achieved.
FIG. 2 is a graph showing the comparison of simulation effects of load shedding methods of a wind turbine generator system according to embodiments of the present invention. A comparison of pitch angle, output power (i.e. electric power) of a load shedding method of a wind park with and without an embodiment of the invention is given in fig. 2. As is obvious from the two curves of the pitch angle (strategic opening) and the pitch angle (strategic closing) and the rated power curve shown in fig. 2, when the wind speed rapidly rises from below the rated speed, the pitch angle action can be significantly advanced after the load reduction method of the wind turbine generator system of the embodiment of the invention is adopted, so that the structural load of the wind turbine generator system can be reduced.
According to the load reduction method of the wind generating set, when the wind speed rises rapidly from below the rated value, the wind generating set can reduce the loads of large parts such as the blade root, the hub and the tower drum through the variable pitch, and the variable pitch action is seldom triggered under the normal power generation condition, so that the load reduction and the cost reduction are achieved, and meanwhile, the generated energy is hardly lost.
The embodiment of the invention also provides a load reduction system 200 of the wind generating set. FIG. 3 discloses a schematic block diagram of a load shedding system 200 of a wind turbine generator system according to an embodiment of the present invention. As shown in fig. 3, a load shedding system 200 of a wind turbine may include one or more processors 201 for implementing the load shedding method of a wind turbine as described in any of the embodiments above. In some embodiments, the wind turbine generator system load shedding system 200 may include a computer readable storage medium 202, and the computer readable storage medium 202 may store a program that may be called by the processor 201, and may include a non-volatile storage medium. In some embodiments, the load shedding system 200 of the wind turbine may include a memory 203 and an interface 204. In some embodiments, the load shedding system 200 of the wind turbine generator system according to the embodiment of the present invention may further include other hardware according to practical applications.
The load reduction system 200 of the wind turbine generator system according to the embodiment of the invention has similar technical effects as the load reduction method of the wind turbine generator system described above, and therefore will not be described herein.
The embodiment of the invention also provides a computer readable storage medium. The computer readable storage medium stores a program which, when executed by a processor, implements the load shedding method of the wind turbine generator set according to any one of the above embodiments.
Embodiments of the invention may take the form of a computer program product embodied on one or more storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having program code embodied therein. Computer-readable storage media include both non-transitory and non-transitory, removable and non-removable media, and information storage may be implemented by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer readable storage media include, but are not limited to: new types of memory, such as phase change memory/resistive random access memory/magnetic memory/ferroelectric memory (PRAM/RRAM/MRAM/FeRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices, or any other non-transmission medium, may be used to store information that may be accessed by the computing device.
The method and system for reducing load of the wind generating set and the computer readable storage medium provided by the embodiment of the invention are described in detail. Specific examples are set forth herein to illustrate the load shedding method of the wind turbine generator system, the system thereof and the computer readable storage medium according to the embodiments of the present invention, and the above description of the embodiments is only for helping to understand the core idea of the present invention, and is not intended to limit the present invention. It should be noted that it will be apparent to those skilled in the art that various changes and modifications can be made herein without departing from the spirit and principles of the invention, which should also fall within the scope of the appended claims.
Claims (12)
1. A load reduction method of a wind generating set is characterized by comprising the following steps of: it comprises the following steps:
in the running process of the wind generating set, acquiring the value of a variable representing the wind speed and the value of the change rate of the variable;
obtaining a pitch angle value of the wind generating set according to the values of the variables and the change rates of the variables and based on the corresponding relations between the variables and the change rates of the variables and the pitch angles; and
and determining a final pitch angle given value of the wind generating set based on a preset pitch angle set value of the wind generating set and the obtained pitch angle value so as to achieve load reduction.
2. The method of claim 1, wherein: the variable representing the wind speed comprises a wind wheel surface equivalent average wind speed of the wind generating set, and the obtaining of the value of the variable representing the wind speed and the value of the change rate of the variable comprises the following steps:
and acquiring the value of the equivalent average wind speed of the wind wheel surface and the value of the change rate of the equivalent average wind speed of the wind wheel surface.
3. The method of claim 2, wherein: the obtaining the value of the equivalent average wind speed of the wind wheel surface comprises the following steps:
a value of the wind turbine face equivalent average wind speed is estimated based on a current rotational speed, a current torque and a current pitch angle of the wind turbine.
4. A method as claimed in claim 3, wherein: the estimating a value of the wind turbine face equivalent average wind speed based on the current rotational speed, the current torque and the current pitch angle of the wind turbine generator set comprises:
estimating a value of the wind turbine surface equivalent average wind speed based on a current rotational speed and a current torque of the wind turbine when the wind turbine is in an underdeveloped state; a kind of electronic device with high-pressure air-conditioning system
When the wind generating set is in a full power state, estimating the value of the equivalent average wind speed of the wind wheel surface based on the current rotating speed and the current pitch angle of the wind generating set.
5. The method of claim 1, wherein: the variable representing the wind speed comprises the torque of the wind generating set, and the obtaining the value of the variable representing the wind speed and the value of the change rate of the variable comprises:
and acquiring the value of the torque and the value of the change rate of the torque.
6. The method of any one of claims 1 to 5, wherein: acquiring the value of the variable and the value of the change rate of the variable comprises:
and calculating the average value of the variable and the change rate of the variable in a preset time period.
7. The method of claim 6, wherein: the calculating an average of the variable and the rate of change of the variable over a predetermined period of time includes:
calculating the average value of the variable and the change rate of the variable in the wind speed rising process for a first preset time period; a kind of electronic device with high-pressure air-conditioning system
Calculating an average value of the variable and a rate of change of the variable during the wind speed decrease for a second predetermined period of time,
wherein the first predetermined time period is different from the second predetermined time period.
8. The method of any one of claims 1 to 5, wherein: the obtaining the pitch angle value of the wind generating set according to the values of the variables and the change rates of the variables and based on the corresponding relation between the variable rates of the variables and the pitch angle comprises:
calculating the value of the product of the variable and the change rate of the variable according to the value of the variable and the value of the change rate of the variable; a kind of electronic device with high-pressure air-conditioning system
And obtaining the pitch angle value according to the value of the product of the variable and the change rate of the variable and based on the corresponding relation between the product of the variable and the change rate of the variable and the pitch angle.
9. The method as recited in claim 8, wherein: the corresponding relation between the product of the variable and the change rate of the variable and the pitch angle comprises a lookup table of the product of the variable and the change rate of the variable and the pitch angle, and the method further comprises:
a lookup table of the product of the variable and the rate of change of the variable and the pitch angle is pre-established by simulation.
10. The method of any one of claims 1 to 5, wherein: the determining the final pitch angle given value of the wind generating set based on the preset pitch angle set value of the wind generating set and the obtained pitch angle value comprises the following steps:
and selecting the larger pitch angle set value from the obtained pitch angle values as the final pitch angle set value.
11. The utility model provides a load reduction system of wind generating set which characterized in that: comprising one or more processors for implementing a method of load shedding of a wind park according to any one of claims 1 to 10.
12. A computer readable storage medium, characterized in that a program is stored thereon, which program, when being executed by a processor, implements a method of load shedding of a wind park according to any of claims 1 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210489683.6A CN117052593A (en) | 2022-05-06 | 2022-05-06 | Load shedding method and system for wind generating set and computer readable storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210489683.6A CN117052593A (en) | 2022-05-06 | 2022-05-06 | Load shedding method and system for wind generating set and computer readable storage medium |
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| CN117052593A true CN117052593A (en) | 2023-11-14 |
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| CN202210489683.6A Pending CN117052593A (en) | 2022-05-06 | 2022-05-06 | Load shedding method and system for wind generating set and computer readable storage medium |
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| Country | Link |
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| CN (1) | CN117052593A (en) |
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- 2022-05-06 CN CN202210489683.6A patent/CN117052593A/en active Pending
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