CN114060208A - Control method, device and equipment of wind generating set and storage medium - Google Patents
Control method, device and equipment of wind generating set and storage medium 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
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- 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
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- F05B2270/103—Purpose of the control system to affect the output of the engine
- F05B2270/1033—Power (if explicitly mentioned)
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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
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Abstract
The application provides a control method, a control device, control equipment and a storage medium of a wind generating set. The control method of the wind generating set comprises the following steps: acquiring real-time output power of the wind generating set; determining a power section where the real-time output power is located; determining a control strategy for the wind generating set according to the power section where the real-time output power is located; and controlling the wind generating set to operate according to the determined control strategy so as to reduce the overall operation load of the wind generating set during operation in different power sections. The application can reduce the whole operation load of the wind generating set when the wind generating set operates in different power sections, prolong the whole service life of the wind generating set, has wider application range compared with the traditional control scheme, and is suitable for different working scenes.
Description
Technical Field
The application relates to the technical field of wind power generation, in particular to a control method, a control device, control equipment and a storage medium of a wind generating set.
Background
In a traditional control scheme of the wind generating set, the wind generating set executes a fixed rotating speed and torque curve under different working scenes, and different control schemes are not adopted in combination with different working scenes.
In order to enable the wind generating set to have good generating performance, in a traditional wind generating set control scheme, on the premise of meeting the load requirements of key large components, the rated rotating speed of the wind generating set is designed to be as high as possible, so that the optimal tip speed ratio is kept, the optimal tip speed ratio can enable the wind energy reuse coefficient of the set to be maximum, the optimal power output is guaranteed, and the generating capacity of the wind generating set can be improved.
However, raising the rated speed brings about the following problems: the higher the rated rotating speed is, the higher the operation load of key large components is, the higher the whole operation load of the wind generating set is, and the shorter the service life is.
Disclosure of Invention
The application provides a control method, a control device, control equipment and a storage medium of a wind generating set aiming at the defects of the existing mode, and aims to solve the technical problems that the control scheme is not determined aiming at different working scenes and the overall operation load of the wind generating set is high in the prior art.
In a first aspect, an embodiment of the present application provides a control method for a wind turbine generator system, including:
acquiring real-time output power of the wind generating set;
determining a power section where the real-time output power is located;
determining a control strategy for the wind generating set according to the power section where the real-time output power is located;
and controlling the wind generating set to operate according to the determined control strategy so as to reduce the overall operation load of the wind generating set during operation in different power sections.
In a second aspect, an embodiment of the present application provides a control device for a wind turbine generator system, including:
the power acquisition module is used for acquiring the real-time output power of the wind generating set;
the power section determining module is used for determining the power section where the real-time output power is located;
the strategy determining module is used for determining a control strategy for the wind generating set according to the power section where the real-time output power is located;
and the unit control module is used for controlling the wind generating set to operate according to the determined control strategy so as to reduce the overall operation load of the wind generating set when the wind generating set operates in different power sections.
In a third aspect, an embodiment of the present application provides a control device for a wind turbine generator system, including:
a memory;
a processor electrically connected to the memory;
the memory stores a computer program, and the computer program is executed by the processor to implement the control method of the wind generating set provided by the first aspect of the embodiment of the present application.
In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, which stores a computer program, and the computer program, when executed by a processor, implements the control method for a wind turbine generator system provided in the first aspect of the embodiment of the present application.
The technical scheme provided by the embodiment of the application at least has the following beneficial effects:
the power section where the real-time output power is located can be determined, different control strategies are adopted for different power sections to control the operation of the wind generating set, and after different power sections are controlled respectively, the operation load of at least part of the power sections can be reduced, so that the overall operation load of the wind generating set during operation in different power sections can be reduced, and the overall service life of the wind generating set can be prolonged; meanwhile, different control strategies are adopted for different power sections, and compared with the traditional control scheme, the control method is wider in application range and suitable for different working scenes.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
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The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic flow chart of a control method of a wind turbine generator system according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram illustrating a comparison between a control strategy provided by an embodiment of the present application and a conventional control strategy;
fig. 3 is a schematic structural framework diagram of a control device of a wind generating set according to an embodiment of the present application;
fig. 4 is a schematic structural framework diagram of a control device of a wind turbine generator system according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to the present application, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar parts or parts having the same or similar functions throughout. In addition, if a detailed description of the known art is not necessary for illustrating the features of the present application, it is omitted. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.
It will be understood by those within the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.
The terms referred to in this application will first be introduced and explained:
tip speed ratio: the ratio of the tip speed to the wind speed and a calculation formula of the tip speed ratio are as follows:
λ ═ ω R/v expression (1)
In expression (1), λ is the tip speed ratio, ω is the impeller angular velocity (rad/s, radians per second), R is the impeller radius (in m, i.e., meters), and v is the wind speed (in m/s, i.e., meters per second).
Full hair state: rated power operating conditions.
The power limiting state: the power of the wind generating set is limited to a value (namely a power limit value) smaller than the rated power, and the wind generating set keeps the power output not to exceed the power limit value through variable pitch unloading.
Optimal gain: the torque regulation coefficient for keeping the maximum power output of the wind generating set before the rated rotating speed, the optimal gain, the electromagnetic torque of the generator and the output power of the wind generating set are in the following relation:
T＝kopt*ω2，P＝T*ω＝kopt*ω3expression (2)
In expression (2), T is the generator electromagnetic torque, koptFor optimal gain, P is the output power (kW, i.e. kW) of the wind turbine generator system, and ω has the same meaning as before.
The optimal tip speed ratio: and obtaining the tip speed ratio when the maximum wind energy utilization coefficient is obtained.
Wind energy utilization coefficient: conversion efficiency of wind generating set for converting wind energy into electric energy by using CpTo indicate.
Maximum wind energy utilization coefficient: and the wind energy utilization coefficient corresponding to the optimal tip speed ratio.
Referring to the expression (1), the inventor of the application researches and discovers that most of existing wind generating sets are variable-pitch variable-speed types, the rotating speed of the wind generating sets is increased along with the increase of the wind speed to keep the optimal tip speed ratio before the rated power, and the optimal tip speed ratio is kept to enable the wind energy utilization coefficient of the set to be maximum, so that the optimal power output is guaranteed. After the wind generating set reaches the rated rotating speed, the rotating speed is not increased along with the increase of the wind speed, and the power of the wind generating set is continuously increased until the wind generating set is fully started through the increase of the electromagnetic torque. Therefore, the optimal tip speed ratio maintaining stage of the wind generating set can be prolonged due to the higher rated rotating speed, and the generating capacity of the wind generating set is improved.
The rated rotating speed of the wind generating set is limited by the limit load and the fatigue load of partial or all parts in key large parts such as a tower frame, a yaw system, a hub, a main shaft, blades, a variable-pitch bearing and the like of the wind generating set. The design idea of the traditional wind generating set is to set the rated rotating speed of the wind generating set to a fixed value, and at the moment, the wind generating set also executes a fixed rotating speed torque curve under different working scenes.
In order to ensure that the wind generating set has good generating performance, the rated rotating speed of the wind generating set is usually designed to be as high as possible or the rated rotating speed of the wind generating set is increased for further increasing the generating capacity on the premise of meeting the load requirements of key large components. However, the higher the rated rotating speed is, the higher the running load of the key large component is, the higher the fatigue load of the unit in a certain time is, and the shorter the service life of the key large component is.
The application provides a control method, a control device, control equipment and a storage medium of a wind generating set, and aims to solve the technical problems in the prior art.
The following describes the technical solutions of the present application and how to solve the above technical problems with specific embodiments.
The embodiment of the application provides a control method of a wind generating set, and as shown in fig. 1, the control method comprises the following steps:
and S101, acquiring the real-time output power of the wind generating set.
And S102, determining a power section where the real-time output power is located.
S103, determining a control strategy for the wind generating set according to the power section where the real-time output power is located.
And S104, controlling the wind generating set to operate according to the determined control strategy so as to reduce the overall operation load of the wind generating set when the wind generating set operates in different power sections.
According to the control method of the wind generating set, the power section where the real-time output power is located can be determined, different control strategies are adopted for different power sections to control the operation of the wind generating set, and after different power sections are controlled respectively, the operation load of at least part of the power sections can be reduced, so that the overall operation load (limit load and/or fatigue load) of the wind generating set during operation of different power sections can be reduced, and the overall service life of the wind generating set is prolonged; meanwhile, different control strategies are adopted for different power sections, and compared with the traditional control scheme, the control method is wider in application range and suitable for different working scenes.
In an alternative embodiment, in step S102, determining a power segment in which the real-time output power is located includes: determining a power section where real-time output power is located according to preset power and rated power of the wind generating set; the preset power is less than the rated power.
Optionally, the obtained real-time output power is respectively compared with a preset power and a rated power, when the real-time output power is smaller than the preset power, the real-time output power is in a first power section, and the power section can be regarded as a power section which is not close to full transmission; when the real-time output power is not less than the preset power and less than the rated power, the real-time output power is in a second power section, and the power section can be regarded as a power section close to full power; and when the real-time output power is equal to the rated power, the real-time output power is considered to be in a stable full-power section.
Optionally, in the embodiment of the present application, the power segment where the real-time output power is located may also be determined according to the operating speed (such as the impeller speed or the generator speed) of the wind turbine generator set or the generator torque.
In an alternative embodiment, in step S103, determining a control strategy for the wind turbine generator set according to the power segment where the real-time output power is located includes:
determining a control strategy as follows: and adjusting the rated rotating speed of the wind generating set according to the power section of the real-time output power.
Optionally, adjusting the rated rotation speed of the wind turbine generator system according to the power section where the real-time output power is located includes:
when the real-time output power is in a first power section smaller than the preset power, the rated rotating speed is adjusted to a first rated rotating speed value from an initial rated rotating speed value step by step; the first rated rotation speed value is greater than the initial rated rotation speed value.
Optionally, the adjusting the rated rotation speed of the wind turbine generator system according to the power section of the real-time output power may further include:
when the real-time output power is in a second power section which is not less than the preset power and less than the rated power, the rated rotating speed is adjusted from the first rated rotating speed value to the initial rated rotating speed value step by step, and the electromagnetic torque of the wind generating set is adjusted according to the rated power.
Optionally, the adjusting the rated rotation speed of the wind turbine generator system according to the power section of the real-time output power may further include:
when the real-time output power is equal to the rated power, the rated rotating speed is adjusted from the initial rated rotating speed value to a second rated rotating speed value step by step, and the electromagnetic torque of the wind generating set is adjusted according to the rated power; the second rated rotation speed value is smaller than the initial rated rotation speed value.
Optionally, the adjusting the rated rotation speed of the wind turbine generator system according to the power section of the real-time output power may further include:
when the real-time output power is equal to the rated power, determining whether the wind generating set meets a full-power condition or not according to the pitch angle of the wind generating set;
when the wind generating set is determined to meet the requirement of a full spring, the rated rotating speed is adjusted from the initial rated rotating speed value to a second rated rotating speed value, and the electromagnetic torque of the wind generating set is adjusted according to the rated power; the second rated rotation speed value is smaller than the initial rated rotation speed value.
The initial rated rotating speed value, the first rated rotating speed value and the second rated rotating speed value in the embodiment of the application can be determined according to key large component parameters and actual requirements of the wind generating set.
Optionally, the first rated rotating speed value may be determined according to a load evaluation result of a key large component in the wind turbine generator system, and on the premise of ensuring that the limit load of the key large component does not exceed the design, the first rated rotating speed value is determined by adjusting the fatigue load amount reduced by the rated rotating speed when the power is limited and the fatigue load of the key large component is ensured not to be increased or not to be increased significantly, and particularly, the first rated rotating speed value is set to a higher value as much as possible on the premise of ensuring that the fatigue load of the key component with a smaller design load margin is not increased.
Optionally, the second setpoint rotational speed value is determined by: and determining a second rated rotating speed value according to a stall boundary of a blade in the wind generating set (after the blade is designed, the stall boundary is determined), the wind energy parameter of the wind power plant and the target operation load.
The stall margin in the embodiment of the present application is determined after the blade design is completed, the wind energy parameter may include a parameter related to wind frequency distribution, and the target operation load may include a limit value of the converter to the electromagnetic torque of the generator.
In one example, the second determined nominal speed value is determined to satisfy the following condition: the second rated rotating speed value is larger than a stall boundary, so that the lifting amount of the electromagnetic torque of the generator is within the bearing limit value of the converter to the electromagnetic torque of the generator; on the basis, if the full-wind-generating frequency is more, the full-wind-generating duration is longer, the rotating speed does not need to be reduced too much, namely the second rated rotating speed value can be adjusted to be a relatively larger value, and if the full-wind-generating speed is less, the reduction range of the rotating speed can be properly increased, namely the second rated rotating speed value can be set to be a relatively smaller value.
The second rated rotating speed value is set in the mode, so that the stalling of the wind generating set caused by too low rotating speed can be avoided on the basis of reducing the operating load of the wind generating set, and the operating safety of the wind generating set is improved.
In one example, the rated rotation speed in the application may be an impeller rotation speed, and the adjustment of the rated rotation speed, that is, the adjustment of the impeller rotation speed, may be performed by adjusting an impeller angular speed when the impeller rotation speed is adjusted, in this case, the initial rated rotation speed value may be an initial impeller angular speed value, the first rated rotation speed value may be a first impeller angular speed value greater than the initial impeller angular speed value, and the second rated rotation speed value may be a second impeller angular speed value greater than the initial impeller angular speed value.
Fig. 2 shows a schematic diagram comparing a control strategy of a wind turbine generator set with a conventional control scheme in the embodiment of the present application, and the principle of the control strategy in the embodiment of the present application is described as follows with reference to the example shown in fig. 2:
the speed torque curve under the conventional control scheme is shown as the ABEI curve in FIG. 2, and the speed torque curve under one control strategy in the embodiment of the present application is shown as the ABEFGHI curve in FIG. 2.
Referring to fig. 2, a control strategy of a wind generating set provided by an embodiment of the present application includes the following three stages:
the first stage is as follows:
when the output power of the wind generating set is less than the preset power PsetAnd the wind generating set executes a rotating speed torque curve ABEFG. In the ABE stage, the control strategy provided by the embodiment of the application is the same as that of the traditional control scheme, and the BE stage tip speed ratio reaches the optimal tip speed ratioThe corresponding wind energy utilization coefficient reaches the maximum wind energy utilization coefficient; in the EFG stage, the wind generating set is not close to a full-power state, the running load of the wind generating set is relatively low, and the rated rotating speed of the wind generating set can be properly increased in the EFG stage based on the consideration of power generation performance and optimal load control.
In the EFG phase, referring to expression (1), when the wind turbine does not reach the rated rotation speed (e.g., EF phase), the impeller angular velocity (characteristic rotation speed) increases with the increase of the wind speed, and in the example shown in fig. 2, the impeller angular velocity is increased from the initial impeller angular velocity value ω0Increase to the first impeller angular velocity value omega1At the moment, the tip speed ratio is maintained at the optimal tip speed ratio, the corresponding wind energy utilization coefficient is maintained at the maximum wind energy utilization coefficient, and the output power of the wind generating set at the stage can be improved by referring to the expression (2), so that the generated energy of the wind generating set at the stage is improved.
Optimal gain k at EF stageoptCan be determined by:
in the expression (3), ρ is the air density (in kg/m)3I.e. kilograms per cubic meter), lambdaoptFor optimum tip speed ratio, Cpmax(lambda) is the maximum wind energy utilization coefficient, and the meanings of the rest parameters can refer to expression (1) and expression (2).
When the wind generating set reaches the rated rotating speed (such as an FG stage), the angular speed of the impeller does not increase along with the increase of the wind speed, the speed ratio of the blade tip is in a descending trend at the moment, the corresponding wind energy utilization coefficient is in a descending trend, and the integral operation load of the wind generating set at the stage can be reduced.
According to the process, when the wind generating set works in the EFG stage, the whole operation load of the wind generating set can be reduced on the basis of ensuring the generating capacity of the wind generating set.
And a second stage:
when the wind generating set is in real timeThe output power is not less than the preset power PsetAnd the real-time output power is less than the rated power PrateAnd when the wind generating set rotates, the working point of the rotating speed and torque curve of the wind generating set is switched back to HI from G.
In the GHI stage, the wind turbine generator system is close to the full-load condition, the operating load of the wind turbine generator system is relatively large, and the operating load is increased continuously when the rotating speed is increased continuously (in the example of fig. 2, the impeller angular speed is increased), so that the service life of the wind turbine generator system is affected, and at this time, the impeller angular speed can be changed from the first impeller angular speed value ω to the first impeller angular speed value ω as shown in fig. 21Reduced to the initial impeller angular velocity value omega0And switching the working point of the wind generating set from the G point back to the HI interval so as to reduce the operation load of the wind generating set at the stage.
The electromagnetic torque T of the generator is increased while the angular speed of the impeller is reduced to reduce the operation load, so that the wind generating set is ensured to have higher output power, and the generating capacity is ensured.
And a third stage:
when the real-time output power of the wind generating set reaches the rated power PrateAnd when the difference angle meets the full-power condition, the working point of the rotating speed and torque curve of the wind generating set is adjusted from I to J.
In the IJ stage, the wind generating set starts to change the pitch and unload along with the increase of the wind speed so as to keep the rated power unchanged, and at the moment, the angular speed of the impeller of the wind generating set is changed from the initial angular speed value omega0Reduced to a second impeller angular velocity value omega2Reducing the rotating speed level of the wind generating set to be lower than that of the traditional control scheme, and performing a low rotating speed control mode; meanwhile, the electromagnetic torque T of the generator set is increased, so that the output power of the wind generating set maintains the rated power Prate。
In the IJ stage, the wind speed is high, and the impeller absorbs the wind energy to the maximum, so that the rotating speed level of the wind generating set is reduced to a level lower than that of the traditional control scheme, and the running load of the wind generating set can be obviously reduced; after the control mode is switched to the low rotating speed control mode, the electromagnetic torque T of the generator is increased, the rated power output can be ensured to be unchanged, and the generating capacity of the wind generating set is not influenced.
By the mode, different control modes can be adopted in different power sections, the generated energy of the wind generating set is guaranteed, and meanwhile the running load of the wind generating set in a part of time periods can be effectively reduced, so that the whole running load of the wind generating set is reduced.
Optionally, determining whether the wind generating set has met a full condition according to the pitch angle of the wind generating set comprises:
determining whether the pitch angle is greater than a pitch angle threshold value at a first moment after the real-time output power is determined to be greater than or equal to the rated power; and when the pitch angle is larger than the pitch angle threshold value at the first moment, determining that the wind generating set meets the full-power condition.
The first time and the pitch angle threshold may be set according to actual requirements, and in one example, if a time at which the real-time output power is determined to be greater than or equal to the rated power is taken as a starting time, the first time may be set to a time 5 minutes after the starting time, which indicates that the pitch angle of the wind turbine generator system at full power generation has lasted for 5 minutes; in one example, the pitch angle threshold may be set at 2 degrees.
In one example, upon determining that the real-time output power is greater than or equal to the rated power, determining whether a filtered value of the pitch angle for 5 minutes is greater than 2 degrees, upon determining that the filtered value of the pitch angle for 5 minutes is greater than 2 degrees, regarding the wind park as having entered a stable full-run state, the wind park having unloaded via the pitching of the park, the wind park having entered a low speed control mode.
In another alternative embodiment, in step S103, determining a control strategy for the wind turbine generator set according to the power segment where the real-time output power is located includes:
when the wind generating set is in a power limiting state, determining a control strategy as follows: and in each power section, adjusting the rotating speed control parameter of the wind generating set according to the target output power in the limited power state (namely the power limit value in the limited power state).
Optionally, adjusting a rotation speed control parameter of the wind turbine generator system according to the target output power in the limited power state includes:
and adjusting the optimal gain parameter of the wind generating set according to the target output power in the limited power state.
Optionally, determining a control strategy for the wind generating set according to the power segment where the real-time output power is located, further comprising:
and when the wind generating set is in a power limiting state and the rotating speed of an impeller of the wind generating set is equal to the rated rotating speed, adjusting the electromagnetic torque of the wind generating set according to the target output power.
The principle of the control strategy in the power-limited state in the embodiment of the present application is described below with reference to the example shown in fig. 2:
the curve of the rotational speed and the torque of the traditional control scheme in the power limiting state is shown as an ABEI curve in fig. 2, and the curve of the rotational speed and the torque of the control strategy in the power limiting state of the embodiment of the application is shown as an ACDJcurve in fig. 2.
Under the power limiting state, the wind generating set has limited power without the wind energy utilization coefficient CpThe maximum value is obtained, the rotating speed and torque curve of the wind generating set is adjusted to be an ACDJ curve at the moment, namely the angular speed of the impeller of the wind generating set is reduced in a full-power section, the wind generating set can operate at a lower rotating speed level in the full-power section, and the whole operating load of the wind generating set can be obviously reduced in a power limiting state based on the reduction of the rotating speed level of the full-power section.
In the CD curve stage, the control of the wind generating set can be realized by adopting a gain control mode. Referring to the foregoing expression (2), the optimal gain k is obtained under the condition that the output power P is constantoptThe larger the impeller angular velocity ω is, the smaller the impeller wheel speed ω is, and the lower the impeller wheel speed is, so that the optimum gain k can be increased at this stageoptIn order to reduce the impeller speed.
In one example, the optimal gain k may be determined byoptIncreasing the optimum gain k by multiplying by a factor greater than 1optThe system multiplied byThe number may be determined in conjunction with the stall boundary of the blade, for example, a target angle value of the impeller angular velocity ω to be adjusted may be determined based on the stall boundary such that the target angle value is greater than the angular velocity value corresponding to the stall boundary, and then the optimal gain k may be determined based on the target angle value to be adjustedoptAnd then the optimum gain k can be determinedoptThe multiplied coefficient. In this way, the coefficients are determined to adjust the optimum gain koptAnd the impeller angular velocity can avoid the stalling of the wind generating set caused by the over-low impeller rotating speed.
During the DJ curve phase, the nominal rotational speed is kept low (e.g. the second impeller angular speed value ω in fig. 2)2) And the control of the wind generating set is realized in a constant power control mode without change. Referring to the foregoing expression (2), the output power P is larger as the generator electromagnetic torque T is larger with the impeller angular velocity ω being constant, and therefore, the output power P can be controlled by adjusting the generator electromagnetic torque T so as to maintain the output power P at the target output power when the impeller angular velocity ω is constant at this stage.
Optionally, in a certain time unit, the operation load level of the wind generating set in a certain working time under different working scenes can be counted, and the operation time and specific parameters (such as the first rated rotating speed value, the second rated rotating speed value and the optimal gain) of the wind generating set under different control strategies in the next working time are selected and automatically adjusted based on the statistical result, so that the real-time performance and the accuracy of the control are improved.
Based on the same inventive concept, as shown in fig. 3, the control device 300 of the wind turbine generator system according to the embodiment of the present application includes: a power acquisition module 301, a power segment determination module 302, a policy determination module 303, and a crew control module 304.
And the power obtaining module 301 is used for obtaining the real-time output power of the wind generating set.
A power segment determining module 302, configured to determine a power segment in which the real-time output power is located.
And the strategy determining module 303 is used for determining a control strategy for the wind generating set according to the power section where the real-time output power is located.
And the unit control module 304 is configured to control the wind generating set to operate according to the determined control strategy, so as to reduce the overall operation load of the wind generating set when the wind generating set operates in different power sections.
Optionally, the power segment determining module 302 is specifically configured to: determining a power section where real-time output power is located according to preset power and rated power of the wind generating set; the preset power is less than the rated power.
In an optional embodiment, the policy determining module 303 is specifically configured to determine the control policy as: and adjusting the rated rotating speed of the wind generating set according to the power section of the real-time output power.
Optionally, the policy determining module 303 is specifically configured to: when the real-time output power is in a first power section smaller than the preset power, the rated rotating speed is adjusted to a first rated rotating speed value from an initial rated rotating speed value step by step; the first rated rotation speed value is greater than the initial rated rotation speed value.
Optionally, the policy determining module 303 is specifically configured to: when the real-time output power is in a second power section which is not less than the preset power and less than the rated power, the rated rotating speed is adjusted from the first rated rotating speed value to the initial rated rotating speed value step by step, and the electromagnetic torque of the wind generating set is adjusted according to the rated power.
In an optional embodiment, the policy determining module 303 is specifically configured to: when the real-time output power is equal to the rated power, the rated rotating speed is adjusted from the initial rated rotating speed value to a second rated rotating speed value step by step, and the electromagnetic torque of the wind generating set is adjusted according to the rated power; the second rated rotation speed value is smaller than the initial rated rotation speed value.
In another optional embodiment, the policy determining module 303 is specifically configured to: when the real-time output power is equal to the rated power, determining whether the wind generating set meets a full-power condition or not according to the pitch angle of the wind generating set; when the wind generating set is determined to meet the requirement of a full spring, the rated rotating speed is adjusted from the initial rated rotating speed value to a second rated rotating speed value, and the electromagnetic torque of the wind generating set is adjusted according to the rated power; the second rated rotation speed value is smaller than the initial rated rotation speed value.
Optionally, the policy determining module 303 is specifically configured to: determining whether the pitch angle is greater than a pitch angle threshold value at a first moment after the real-time output power is determined to be greater than or equal to the rated power; and when the pitch angle is larger than the pitch angle threshold value at the first moment, determining that the wind generating set meets the full-power condition.
In another optional embodiment, the policy determining module 303 is specifically configured to: when the wind generating set is in a power limiting state, determining a control strategy as follows: and in each power section, adjusting the rotating speed control parameters of the wind generating set according to the target output power in the limited power state.
Optionally, the policy determining module 303 is specifically configured to: and adjusting the optimal gain parameter of the wind generating set according to the target output power in the limited power state.
Optionally, the policy determining module 303 is specifically configured to: and when the wind generating set is in a power limiting state and the rotating speed of an impeller of the wind generating set is equal to the rated rotating speed, adjusting the electromagnetic torque of the wind generating set according to the target output power.
The control device 300 of the wind generating set of this embodiment may execute any control method of the wind generating set provided in this embodiment, and the implementation principles thereof are similar, and details that are not shown in this embodiment may refer to the foregoing method embodiment, and are not described herein again.
Based on the same inventive concept, the embodiment of the application provides a control device of a wind generating set, and the control device comprises: the storage and the processor are electrically connected.
The memory is stored with a computer program, and the computer program is executed by the processor to realize the control method of any wind generating set provided by the embodiment of the application.
It will be appreciated by those skilled in the art that the control apparatus for a wind turbine provided in the embodiments of the present application may be specially designed and manufactured for the required purposes, or may comprise known apparatus in a general purpose computer. These devices have stored therein computer programs that are selectively activated or reconfigured. Such a computer program may be stored in a device (e.g., computer) readable medium or in any type of medium suitable for storing electronic instructions and respectively coupled to a bus.
In an alternative embodiment, the present application provides a control apparatus of a wind turbine generator system, as shown in fig. 4, the control apparatus 400 includes: the memory 401 and the processor 402 are electrically connected, such as by a bus 403.
Optionally, the memory 401 is used for storing application program codes for executing the scheme of the present application, and the processor 402 controls the execution. The processor 402 is configured to execute the application program code stored in the memory 401 to implement any one of the methods for controlling a wind turbine generator system according to the embodiments of the present application.
The Memory 401 may be a ROM (Read-Only Memory) or other type of static storage device that can store static information and instructions, a RAM (Random Access Memory) or other type of dynamic storage device that can store information and instructions, an EEPROM (Electrically Erasable Programmable Read Only Memory), a CD-ROM (Compact Disc Read-Only Memory) or other optical disk storage, optical disk storage (including Compact Disc, laser Disc, optical Disc, digital versatile Disc, blu-ray Disc, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to these.
The Processor 402 may be a CPU (Central Processing Unit), a general purpose Processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or other Programmable logic device, transistor logic device, hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor 402 may also be a combination of computing functions, e.g., comprising one or more microprocessors, a combination of a DSP and a microprocessor, or the like.
Optionally, the control device 400 may also include a transceiver 404. The transceiver 404 may be used for reception and transmission of signals. The transceiver 404 may allow the control device 400 to communicate wirelessly or by wire with other devices to exchange data. It should be noted that the transceiver 404 is not limited to one in practical applications.
Optionally, the control device 400 may further include an input unit 405. The input unit 405 may be used to receive input numeric, character, image, and/or sound information or to generate key signal inputs related to user settings and function control of the electronic device 400. The input unit 405 may include, but is not limited to, one or more of a touch screen, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, a camera, a microphone, and the like.
Optionally, the control device 400 may further include an output unit 406. Output unit 406 may be used to output or present information processed by processor 402. The output unit 406 may include, but is not limited to, one or more of a display device, a speaker, a vibration device, and the like.
While fig. 4 illustrates a control apparatus 400 having various means, it is to be understood that not all illustrated means are required to be implemented or provided. More or fewer devices may alternatively be implemented or provided.
Based on the same inventive concept, the embodiment of the present application provides a computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the control method of any wind turbine generator system provided by the embodiment of the present application.
The computer readable medium includes, but is not limited to, any type of disk including floppy disks, hard disks, optical disks, CD-ROMs, and magneto-optical disks, ROMs, RAMs, EPROMs (Erasable Programmable Read-Only Memory), EEPROMs, flash Memory, magnetic cards, or fiber optic cards. That is, a readable medium includes any medium that stores or transmits information in a form readable by a device (e.g., a computer).
The embodiment of the application provides a computer-readable storage medium suitable for any one of the above control methods of the wind turbine generator system, which is not described herein again.
By applying the embodiment of the application, at least the following beneficial effects can be realized:
1) the power section where the real-time output power is located can be determined, different control strategies are adopted for different power sections to control the operation of the wind generating set, and after different power sections are controlled respectively, the operation load of at least part of the power sections can be reduced, so that the overall operation load of the wind generating set during operation in different power sections can be reduced, and the overall service life of the wind generating set can be prolonged; meanwhile, different control strategies are adopted for different power sections, and compared with the traditional control scheme, the control method is wider in application range and suitable for different working scenes.
2) Compared with the traditional control scheme of only executing the fixed rotating speed torque curve, the control method and the control device for the wind generating set can be used for adjusting the rated rotating speed by combining the current working scene so that the overall rotating speed level of the wind generating set is more suitable for the current working scene. Specifically, the rated rotating speed can be appropriately increased to improve the power generation capacity under the condition that a higher operating rotating speed is required to be maintained and the operating load is not remarkably increased (such as under the condition of not approaching full power generation), and the rated rotating speed of the wind power generator set at a certain stage can be reduced under the condition that the operating load of the wind power generator set is not required to be remarkably increased (such as under the condition of approaching full power generation or being stabilized at full power generation) so that the whole load level of the wind power generator set at the stage is reduced and the power generation capacity is not influenced.
3) According to the embodiment of the application, each power section can be divided according to the preset power and the rated power so as to identify different running states, and then different control requirements can be accurately distinguished according to the running states of the wind generating set, so that the corresponding adjusting mode of the rated rotating speed can be more accurately determined. For example, when the real-time output power is in the first power section, the real-time output power is considered to belong to the running state of not fully transmitting and not approaching fully transmitting, and the rated rotating speed is increased; when the real-time output power is in a second power section, the real-time output power is considered to belong to an operation state of not fully transmitting but approaching fully transmitting, and the rated rotating speed is reduced; and when the real-time output power is equal to the rated power, the real-time output power is considered to belong to a stable full-transmission running state, and the rated rotating speed is continuously reduced.
4) When the real-time output power of the wind generating set is equal to the rated power, whether the wind generating set is in a full-power state or not and the stability degree of the full-power state can be determined by combining the state of the pitch angle, and the control precision can be further improved.
5) The embodiment of the application can execute a corresponding control strategy aiming at the power limit state, and compared with the traditional control scheme, the embodiment of the application can enable the wind generating set to operate at a lower rotating speed level in the full power section, and can obviously reduce the operation load of the set in the power limit time period, thereby achieving the purpose of reducing the whole operation load of the wind generating set.
And counting the working time of the unit in different working scenes and the reduced accumulated fatigue load level in a certain time unit, and automatically adjusting the running time and specific parameter selection of the unit in different control modes of the unit in the next working time based on the counting result.
Those of skill in the art will appreciate that the various operations, methods, steps in the processes, acts, or solutions discussed in this application can be interchanged, modified, combined, or eliminated. Further, other steps, measures, or schemes in various operations, methods, or flows that have been discussed in this application can be alternated, altered, rearranged, broken down, combined, or deleted. Further, steps, measures, schemes in the prior art having various operations, methods, procedures disclosed in the present application may also be alternated, modified, rearranged, decomposed, combined, or deleted.
In the description of the present application, it is to be understood that the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
It should be understood that, although the steps in the flowcharts of the figures are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and may be performed in other orders unless explicitly stated herein. Moreover, at least a portion of the steps in the flow chart of the figure may include multiple sub-steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed alternately or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
The foregoing is only a partial embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the principle of the present application, and these modifications and decorations should also be regarded as the protection scope of the present application.
Claims (15)
1. A control method of a wind generating set is characterized by comprising the following steps:
acquiring real-time output power of the wind generating set;
determining a power segment where the real-time output power is located;
determining a control strategy for the wind generating set according to the power section where the real-time output power is located;
and controlling the wind generating set to operate according to the determined control strategy so as to reduce the overall operation load of the wind generating set when the wind generating set operates in different power sections.
2. The control method according to claim 1, wherein determining a control strategy for the wind turbine generator set according to the power segment in which the real-time output power is located comprises:
determining the control strategy as: and adjusting the rated rotating speed of the wind generating set according to the power section of the real-time output power.
3. The control method according to claim 1 or 2, wherein the determining the power segment in which the real-time output power is located comprises:
determining a power section where the real-time output power is located according to preset power and rated power of the wind generating set;
the preset power is smaller than the rated power.
4. The control method according to claim 3, wherein the adjusting the rated rotating speed of the wind generating set according to the power section of the real-time output power comprises:
when the real-time output power is in a first power section smaller than the preset power, the rated rotating speed is adjusted to a first rated rotating speed value from an initial rated rotating speed value step by step; the first rated rotation speed value is greater than the initial rated rotation speed value.
5. The control method according to claim 4, wherein the adjusting the rated rotation speed of the wind turbine generator set according to the power section of the real-time output power further comprises:
and when the real-time output power is in a second power section which is not less than the preset power and less than the rated power, gradually adjusting the rated rotating speed from the first rated rotating speed value to the initial rated rotating speed value, and adjusting the electromagnetic torque of the wind generating set according to the rated power.
6. The control method according to claim 5, wherein the rated rotation speed of the wind turbine generator set is adjusted according to the power section where the real-time output power is located, and the method further comprises the following steps:
when the real-time output power is equal to the rated power, the rated rotating speed is adjusted from the initial rated rotating speed value to a second rated rotating speed value step by step, and the electromagnetic torque of the wind generating set is adjusted according to the rated power; the second rated rotating speed value is smaller than the initial rated rotating speed value.
7. The control method according to claim 6, characterized in that the second setpoint rotational speed value is determined by:
and determining the second rated rotating speed value according to the stall boundary of the blades in the wind generating set, the wind energy parameters of the wind power plant and the target operation load.
8. The control method according to claim 5, wherein the adjusting the rated rotation speed of the wind turbine generator set according to the power section of the real-time output power further comprises:
when the real-time output power is equal to the rated power, determining whether the wind generating set meets a full-power condition or not according to the pitch angle of the wind generating set;
when the wind generating set is determined to meet the full-load condition, the rated rotating speed is adjusted from the initial rated rotating speed value to a second rated rotating speed value, and the electromagnetic torque of the wind generating set is adjusted according to the rated power; the second rated rotating speed value is smaller than the initial rated rotating speed value.
9. The control method according to claim 8, wherein said determining whether the wind park has met a full condition according to a pitch angle of the wind park comprises:
determining whether the pitch angle is greater than a pitch angle threshold value at a first time after the real-time output power is determined to be greater than or equal to the rated power;
determining that the wind generating set has met a full condition when it is determined that the pitch angle is greater than the pitch angle threshold at the first time.
10. The control method according to claim 1 or 2, wherein determining a control strategy for the wind park according to the power segment in which the real-time output power is located comprises:
when the wind generating set is in a power limiting state, determining that the control strategy is as follows: and in each power section, adjusting the rotating speed control parameters of the wind generating set according to the target output power in the limited power state.
11. The control method according to claim 10, wherein the adjusting the speed control parameter of the wind turbine generator set according to the target output power of the limited power state comprises:
and adjusting the optimal gain parameter of the wind generating set according to the target output power in the limited power state.
12. The control method of claim 10, wherein determining a control strategy for the wind turbine generator set according to the power segment in which the real-time output power is located further comprises:
and when the wind generating set is in a power limiting state and the rotating speed of an impeller of the wind generating set is equal to the rated rotating speed, adjusting the electromagnetic torque of the wind generating set according to the target output power.
13. A control device of a wind generating set is characterized by comprising:
the power acquisition module is used for acquiring the real-time output power of the wind generating set;
the power section determining module is used for determining the power section where the real-time output power is located;
the strategy determining module is used for determining a control strategy for the wind generating set according to the power section where the real-time output power is located;
and the unit control module is used for controlling the wind generating set to operate according to the determined control strategy so as to reduce the overall operation load of the wind generating set when the wind generating set operates in different power sections.
14. A control device of a wind turbine, comprising:
a memory;
a processor electrically connected with the memory;
the memory stores a computer program for execution by the processor to implement the method of controlling a wind park according to any of claims 1-12.
15. A computer-readable storage medium, characterized in that a computer program is stored which, when being executed by a processor, carries out the method of controlling a wind park according to any one of claims 1-12.
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