CN116928020A - Pitch angle control method considering rapid active power adjustment of wind driven generator - Google Patents
Pitch angle control method considering rapid active power adjustment of wind driven generator Download PDFInfo
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- CN116928020A CN116928020A CN202310725331.0A CN202310725331A CN116928020A CN 116928020 A CN116928020 A CN 116928020A CN 202310725331 A CN202310725331 A CN 202310725331A CN 116928020 A CN116928020 A CN 116928020A
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- 239000002131 composite material Substances 0.000 claims 2
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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
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/022—Adjusting aerodynamic properties of the blades
- F03D7/0224—Adjusting blade pitch
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/028—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor controlling wind motor output power
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/028—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor controlling wind motor output power
- F03D7/0288—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor controlling wind motor output power in relation to clearance between the blade and the tower, i.e. preventing tower strike
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/028—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor controlling wind motor output power
- F03D7/0292—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor controlling wind motor output power to reduce fatigue
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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
- F05B2260/00—Function
- F05B2260/84—Modelling or simulation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Wind Motors (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The pitch angle control method considering the rapid active power adjustment of the wind driven generator can reduce the pitch angle fluctuation of all PMSG during the rapid active power control, minimize the fatigue damage of the wind driven generator, prolong the service life of the wind driven generator and reduce the maintenance cost; the method comprises the following steps: s1, a wind farm controller in a wind farm sends reference power to a plurality of permanent magnet synchronous generators, and then a mathematical model of the permanent magnet synchronous generators is built to obtain a power coefficient c of the wind generator P The method comprises the steps of carrying out a first treatment on the surface of the S2, constructing a wake effect model of a wind power plant comprising a plurality of mathematical models of permanent magnet synchronous generators so as to obtain a slave power coefficient c P A plurality of pitch angles beta are determined; s3, constructing a rapid active power control model of the wind power plant so as to meet the requirement that the pitch angle beta fluctuation of the permanent magnet synchronous generator is minimum.
Description
Technical Field
The application relates to the technical field of wind power generation, in particular to a pitch angle control method considering rapid active power adjustment of a wind power generator.
Background
In order to slow down climate change and achieve the paris climate goal, fossil energy must be replaced with renewable energy sources such as wind, hydraulic and solar energy. Currently, wind energy is the second largest energy source next to hydroelectric power. This trend will appear to continue in the future until 2050 as the primary source of energy production, and in order to promote this positive and sustainable trend, wind energy and wind power generator research must continue and progress forward.
Under the background that the single machine capacity of the existing fan electric group is continuously increased and the wind power technology is continuously mature, the key point of the large-scale fan electric group is how to reduce the manufacturing and running cost; one effective way to reduce the cost of the wind turbine is to reduce the wear of each key component of the wind turbine, thereby improving the reliability of the wind power equipment and prolonging the service life of the wind power generator. However, the large wind turbine generator generates unbalanced load to the impeller under the influence of aerodynamic effects such as wind turbulence, wind shearing, tower shadow effect, yaw deviation and the like, and the unbalanced degree of the stress of the whole wind wheel surface is stronger along with the larger diameter of the wind wheel, the unbalanced load on the impeller is more obvious, and the unbalanced load on the impeller can cause great fatigue load to key components of the wind turbine generator such as a variable pitch bearing, a hub, a main shaft, a yaw bearing, a tower and the like, so that the running cost is increased. In theory, if the pitch angle fluctuation of the wind driven generator is reduced through blade pitch control during the operation of the wind driven generator rapid active power regulation control, the fatigue damage of the wind driven generator can be minimized, so that the service life of the wind driven generator is prolonged, and the maintenance cost is reduced, but the current pitch angle is determined through a traditional proportional integral controller (PI), and the method has a certain error, so that the result is inaccurate and cannot be used as a basis. Thus, research and consideration of a pitch control method of a wind driven generator is a key problem to be solved.
Disclosure of Invention
In view of the above problems, an object of the present application is to provide a pitch angle control method that considers fast active power adjustment of a wind turbine, so as to solve the problems set forth in the above background art.
In order to achieve the above purpose, the present application adopts the following technical scheme:
a pitch angle control method considering rapid active power adjustment of a wind driven generator is characterized by comprising the following steps:
s1, a wind farm controller in a wind farm sends reference power to a plurality of permanent magnet synchronous generators, and then a mathematical model of the permanent magnet synchronous generators is built to obtain a power coefficient c of the wind generator P ；
S2, constructing a wake effect model of a wind power plant comprising a plurality of mathematical models of permanent magnet synchronous generators so as to obtain a slave power coefficient c P A plurality of pitch angles beta are determined;
s3, constructing a rapid active power control model of the wind power plant so as to meet the requirement that the pitch angle beta fluctuation of the permanent magnet synchronous generator is minimum.
Further, in the step S1, the mathematical model of the permanent magnet synchronous generator has the following expression:
P mech ＝0.5ρAv 3 c P (λ,β) (1)
wherein ,Pmech Representing mechanical input power;
ρ, A and v represent air density, blade rotor swept area and wind speed, respectively;
c P is the power coefficient of the wind driven generator;
lambda is the tip speed ratio; beta is the pitch angle;
further, the method comprises the steps of,power coefficient c of wind power generator P Expressed as:
wherein ,
further, in the step S2, by constructing the wake effect model, a synthetic wind speed after considering the wake effect is obtained, where the expression of the synthetic wind speed is:
wherein ,Vi Representing WTG j Is set to the synthetic wind speed;
WTG j denoted as j-th wind generator;
V j is WTG (WTG) j Wind speed without any wake;
β ji is WTG (WTG) i The ratio of the area under shadow to its total area;
WTG i denoted as the i-th wind generator;
x ji is the radial distance between the j-th and i-th wind generator units;
a j is WTG (WTG) j Axial inductance of (c);
D j is WTG (WTG) j Diameter of rotor area;
k represents a constant for realizing MPPT control;
n is the total number of wind power generators;
further, the construction of the fast active power control model includes the following steps:
s3.1, distributing required power to the permanent magnet synchronous generator by the wind farm controller to adjust the output power of the public coupling point, wherein the distribution rule is as follows:
wherein , and />Respectively WTG i Reference power, active power control commands and available power of (a);
WTG i denoted as the i-th wind generator;
s3.2, the wind driven generator controller receives reference power from the wind farm controllerTo obtain the reference power coefficient of the wind power generator>The expression is:
P air ＝0.5ρAv 3 (7)
wherein ,Pair Is available air power;
s3.3, according to the reference power coefficient of the wind driven generatorDetermining and obtaining the optimal tip speed ratio lambda;
further, determining that the pitch angle β ripple is minimal comprises the steps of:
s4.1, drawing a characteristic curve based on different pitch angles beta;
s4.2, reference power coefficient through wind driven generatorDetermining a first straight line;
s4.3, determining a second straight line through the optimal tip speed ratio lambda;
s4.4, determining intersection points of the characteristic curve, the first straight line and the second straight line according to the characteristic curve, wherein the position of the intersection points is the optimal pitch angle and is recorded as beta ref Minimum fluctuation is satisfied.
Compared with the prior art, the application has the beneficial effects that:
the patent can reduce the pitch angle fluctuation of all the permanent magnet synchronous generators during the fast active power control, namely the power coefficient c of the wind driven generator P After resolving to obtain a plurality of pitch angles beta, determining the optimal tip speed ratio lambda during active power adjustment by constructing a rapid active power control model, and finally obtaining the optimal pitch angle beta meeting the minimum fluctuation ref Therefore, stable active power control operation under the condition of minimum fluctuation of pitch angle and rotor speed can be ensured, fatigue damage of the wind driven generator can be minimized, the service life of the wind driven generator is prolonged, and maintenance cost is reduced.
The foregoing description is only an overview of the present application, and is intended to provide a better understanding of the present application, as it is embodied in the following description, with reference to the preferred embodiments of the present application and the accompanying drawings. Specific embodiments of the present application are given in detail by the following examples and the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application.
FIG. 1 is a flow chart of the present application;
FIG. 2 is a graph of mechanical input power characteristics of a permanent magnet synchronous generator PMSG;
FIG. 3 is a schematic diagram of power distribution in a wind farm according to the present application;
FIG. 4 is a diagram ofIn the application c P -lambda graph;
FIG. 5a is a graph of the active power of a wind park WPP;
fig. 5b is a graph of the active power of a conventional scheme permanent magnet synchronous generator PMSG;
FIG. 5c is a graph of PMSG active power for a permanent magnet synchronous generator according to an embodiment of the present application;
FIG. 5d is a graph of the pitch angle of a permanent magnet synchronous generator PMSG in a conventional approach;
FIG. 5e is a graph of the pitch angle of the PMSG of the permanent magnet synchronous generator according to an embodiment of the present application;
FIG. 5f is a graph of rotor speed of a permanent magnet synchronous generator PMSG in a conventional approach;
fig. 5g is a graph of rotor speed of a permanent magnet synchronous generator PMSG in an embodiment of the application.
Detailed Description
The principles and features of the present application are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the application and are not to be construed as limiting the scope of the application. The application is more particularly described by way of example in the following paragraphs with reference to the drawings. Advantages and features of the application will become more apparent from the following description and from the claims. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the application.
Unless defined otherwise, all 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. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
According to the embodiment, the pitch angle control model is analyzed according to a flow chart of a pitch angle control method considering fast active power adjustment of the wind driven generator shown in fig. 1.
Referring to fig. 1, a pitch angle control method considering fast active power adjustment of a wind driven generator includes the following steps:
s1, a system controller sends a command to a wind farm controller (namely a WPP controller) in a wind farm, then the wind farm controller in the wind farm sends reference power to a plurality of permanent magnet synchronous generators, and then a mathematical model of the Permanent Magnet Synchronous Generator (PMSG) is built to obtain a power coefficient c of the wind generator P ；
In the step S1, the mathematical model of the permanent magnet synchronous generator has the following expression:
P mech ＝0.5ρAv 3 c P (λ,β) (1)
wherein ,Pmech Representing mechanical input power; the wind power generator converts wind power into mechanical input power P mech ；
ρ, A and v represent air density, blade rotor swept area and wind speed, respectively;
c P is the power coefficient of the wind driven generator; power coefficient c P Depending on tip speed ratio λ and pitch angle β;
lambda is the tip speed ratio; beta is the pitch angle;
further, the power coefficient c of the wind driven generator P Expressed as:
wherein ,
typical configurations of permanent magnet synchronous generators include a Machine Side Converter (MSC) for extracting maximum power from the wind and a Grid Side Converter (GSC) for maintaining the dc link voltage and injecting the required reactive power into the grid;
mechanical input power P of wind driven generator in maximum power tracking (MPPT) control mode mech And rotor speed omega r Characteristic curve and maximum of (2)The power curve is shown in FIG. 2, i.e. the mechanical input power P at different wind speeds mech The relationship with fan speed is expressed as:
wherein ,kopt Is a constant for maximum power tracking control; omega opt Is the optimal rotor speed.
In fig. 1, tr.1 and tr.2 respectively represent different connection transformers;
WPP represents wind power generation fields, each wind power generation field is provided with a plurality of wind power generators WTG, and each wind power generator corresponds to one permanent magnet synchronous generator PMSG;
s2, constructing a wake effect model of a wind power plant comprising a plurality of mathematical models of permanent magnet synchronous generators so as to obtain a slave power coefficient c P A plurality of pitch angles beta are determined;
in the step S2, the plurality of wind power generator units in the wind farm may have a plurality of wake flows with different degrees, so that when determining the wind speed of the wind power generator, the overlapping area between the wind power generators should be considered, and then the WTG is based on the law of conservation of momentum j Is set to the synthetic wind velocity V i Can be expressed as:
wherein ,Vi Representing WTG j Is set to the synthetic wind speed;
WTG j denoted as j-th wind generator;
V j is WTG (WTG) j Wind speed without any wake;
β ji is WTG (WTG) i The ratio of the area under shadow to its total area;
WTG i denoted as the i-th wind generator;
x ji is the radial distance between the j-th and i-th wind generator units;
a j is WTG (WTG) j Axial inductance of (c);
D j is WTG (WTG) j Diameter of rotor area;
k represents a constant for realizing MPPT control;
n is the total number of wind power generators;
the wake effect mainly affects the wind speed of the fan, so that the formula (5) considers the influence of the wake effect on the wind speed of the fan, the influence of the wake effect on the model is the influence on the wind speed, and the synthetic wind speed is the wind speed after the wake effect is considered;
s3, constructing a rapid active power control model of the wind power plant so as to meet the requirement of minimum fluctuation of the pitch angle beta of the permanent magnet synchronous generator;
the construction of the fast active power control model comprises the following steps:
s3.1, as shown in fig. 3, the wind farm controller distributes the required power to the permanent magnet synchronous generator to adjust the output power of the Point of Common Coupling (PCC) which is adjusted to 20% of the rated capacity of the wind farm controller, with the distribution rule:
wherein , and />Respectively WTG i Reference power, active power control commands and available power of (a);
WTG i denoted as the i-th wind generator;
s3.2, the wind turbine controller normally regulates the permanent magnet synchronous generator in MPPT control mode, however, when the wind turbine farm level control is active, the wind turbine is controlledThe controller receives reference power from the wind farm controllerTo obtain the reference power coefficient of the wind power generator>The expression is:
P air ＝0.5ρAv 3 (8)
wherein ,Pair Is available air power;
s3.3, according to the reference power coefficient of the wind driven generatorDetermining and obtaining the optimal tip speed ratio lambda;
further, determining that the pitch angle β ripple is minimal comprises the steps of:
s4.1, obtaining different pitch angles beta from a table of a table function, and then drawing a characteristic curve based on the different pitch angles beta;
table functions, referring to c in FIG. 4 P -lambda curve according to c P -lambda curve, converted into tabular form;
s4.2, reference power coefficient through wind driven generatorDetermining a first straight line (i.e., a horizontal line);
s4.3, determining a second straight line (namely a vertical line) through the optimal tip speed ratio lambda;
s4.4, determining intersection points of the characteristic curve, the first straight line and the second straight line according to the characteristic curve, wherein the position of the intersection points is the optimal pitch angle and is recorded as beta ref Minimum fluctuation is satisfied.
The application is illustrated with 4 columns of permanent magnet synchronous generators (hereinafter, permanent magnet synchronous generators are represented by PMSG only):
corresponding to a wind speed of 10m/s and a wind direction of 0 deg., wherein the PMSG of the first column reaches a wind speed of 10m/s and the wake wind speeds of the other PMSGs of the second, third and fourth columns are 8.71, 8.56 and 8.51m/s, respectively, which means that the PMSG1 should consume more power than the other PMSGs.
As shown in fig. 5a, due to the small wind speed, the active power of the Point of Common Coupling (PCC) in both schemes is only 42.1MW before the fast active power control is activated; at 30 seconds, if fast active power control is activated, the WPP wind farm controller and PMSG controller will reduce the output power to 20MW within 5 seconds;
as shown in fig. 5b and 5c, the active power of the PMSG is the same before the fast active power control is deactivated;
prior to fast active power control, PMSG1, PMSG2, PMSG3, and PMSG4 produced active powers of 2.88MW, 1.91MW, 1.81MW, and 1.78MW, respectively;
after the fast active power control is activated, the output power of each PMSG successfully drops to 1.37MW, 0.90MW, 0.86MW, and 0.85MW, respectively;
the fast active power control is represented, and the fast active power control of the fan can be realized by adjusting the pitch angle;
in fig. 5d and 5e, the pitch angle of the PMSG shows completely different dynamics. In the conventional scheme, the pitch angles of PMSG1, PMSG2, PMSG3 and PMSG4 reach 8.3 ° at 36.0 seconds, 8.1 ° at 43.4 seconds, peaks at 81 ° at 43.5 seconds and 8.1 ° at 34.4 seconds, respectively, and they slowly converge to β ref . The pitch angle of the PMSG1 with the largest wind speed fluctuates faster than the other PMSGs because the wind speed of each column is actually decreasing due to wake effects, the rotor speed of the PMSG1 increases and fluctuates more than the other PMSGs, and the wind speed is larger [ see fig. 5f]. Other PMSGs in the conventional solution show similar pitch angle and rotor speed dynamics because PMSGs have similar arrival wind speeds, in the proposed solution of the application all PMSGs have the same pitch angle dynamics despite the different arrival wind speeds, becauseIn the proposal of the application, the reference power coefficient of all PMSGAll are identical, the pitch angle of the proposed solution also has less fluctuation than the conventional solution and it quickly converges to beta as determined by parsing ref Compared with the conventional scheme, the rotor speed of the scheme provided by the application has smaller fluctuation because of beta ref Determined to maintain the optimal rotor speed, the pitch angle also quickly converges to 6.9 °, see fig. 5g.
The test results show that: this approach ensures stable active power control operation with minimal pitch angle and rotor speed fluctuations, taking into account wake effects.
The application relates to a pitch control scheme based on rapid active adjustment of a Permanent Magnet Synchronous Generator (PMSG) wind farm (WPP), which can realize rapid control of active power of a fan by adjusting a pitch angle so as to reduce pitch angle fluctuation of all PMSG during rapid active power control. In order to minimize pitch angle fluctuations, pitch angle is determined by using analytical calculations instead of conventional proportional integral controllers (PI), and when active power control signals are received from the grid, the wind farm controller sends reference power to each PMSG, and the proposed pitch control scheme derives reference power coefficients from the reference power and the available powerIt then analytically determines from the reference power coefficient function an optimal pitch angle that meets the reference power coefficient, in order to reduce fluctuations in rotor speed, a pitch angle is determined to maintain an optimal tip speed ratio λ during active power adjustment.
The above description is only of the preferred embodiments of the present application, and is not intended to limit the present application in any way; those skilled in the art will readily appreciate that the present application may be implemented as shown in the drawings and described above; however, those skilled in the art will appreciate that many modifications, adaptations, and variations of the present application are possible in light of the above teachings without departing from the scope of the application; meanwhile, any equivalent changes, modifications and evolution of the above embodiments according to the essential technology of the present application still fall within the scope of the present application.
Claims (6)
1. A pitch angle control method considering rapid active power adjustment of a wind driven generator is characterized by comprising the following steps:
s1, a wind farm controller in a wind farm sends reference power to a plurality of permanent magnet synchronous generators, and then a mathematical model of the permanent magnet synchronous generators is built to obtain a power coefficient c of the wind generator P ；
S2, constructing a wake effect model of a wind power plant comprising a plurality of mathematical models of permanent magnet synchronous generators so as to obtain a slave power coefficient c P A plurality of pitch angles beta are determined;
s3, constructing a rapid active power control model of the wind power plant so as to meet the requirement that the pitch angle beta fluctuation of the permanent magnet synchronous generator is minimum.
2. The pitch angle control method according to claim 1, wherein in step S1, the mathematical model of the permanent magnet synchronous generator is expressed as follows:
P mech ＝0.5ρAv 3 c P (λ,β) (1)
wherein ,Pmech Representing mechanical input power;
ρ, A and v represent air density, blade rotor swept area and wind speed, respectively;
c P is the power coefficient of the wind driven generator;
lambda is the tip speed ratio; beta is the pitch angle.
3. A pitch angle control method taking into account fast active power adjustment of a wind turbine according to claim 1, characterized in that the wind turbine isPower coefficient c P Expressed as:
wherein ,
4. the pitch angle control method according to claim 1, wherein in step S2, the composite wind speed after considering the wake effect is obtained by constructing the wake effect model, and the expression of the composite wind speed is:
wherein ,Vi Representing WTG j Is set to the synthetic wind speed;
WTG j denoted as j-th wind generator;
V j is WTG (WTG) j Wind speed without any wake;
β ji is WTG (WTG) i The ratio of the area under shadow to its total area;
WTG i denoted as the i-th wind generator;
x ji is the radial distance between the j-th and i-th wind generator units;
a j is WTG (WTG) j Axial inductance of (c);
D j is WTG (WTG) j Diameter of rotor area;
k represents a constant for realizing MPPT control;
n is the total number of wind turbines.
5. A pitch angle control method taking into account fast active power adjustment of a wind turbine according to claim 1, wherein the construction of the fast active power control model comprises the steps of:
s3.1, distributing required power to the permanent magnet synchronous generator by the wind farm controller to adjust the output power of the public coupling point, wherein the distribution rule is as follows:
wherein , and />Respectively WTG i Reference power, active power control commands and available power of (a);
WTG i denoted as the i-th wind generator;
s3.2, the wind driven generator controller receives reference power from the wind farm controllerTo obtain the reference power coefficient of the wind power generator>The expression is:
P air ＝0.5ρAv 3 (7)
wherein ,Pair Is available air power;
s3.3, according to the reference power coefficient of the wind driven generatorAn optimal tip speed ratio lambda is determined.
6. A pitch angle control method taking into account fast active power adjustment of a wind turbine according to claim 1, characterized in that it is determined that the pitch angle β fluctuation is minimal, comprising the steps of:
s4.1, drawing a characteristic curve based on different pitch angles beta;
s4.2, reference power coefficient through wind driven generatorDetermining a first straight line;
s4.3, determining a second straight line through the optimal tip speed ratio lambda;
s4.4, determining intersection points of the characteristic curve, the first straight line and the second straight line according to the characteristic curve, wherein the position of the intersection points is the optimal pitch angle and is recorded as beta ref Minimum fluctuation is satisfied.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310725331.0A CN116928020A (en) | 2023-06-19 | 2023-06-19 | Pitch angle control method considering rapid active power adjustment of wind driven generator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310725331.0A CN116928020A (en) | 2023-06-19 | 2023-06-19 | Pitch angle control method considering rapid active power adjustment of wind driven generator |
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| CN116928020A true CN116928020A (en) | 2023-10-24 |
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| CN202310725331.0A Pending CN116928020A (en) | 2023-06-19 | 2023-06-19 | Pitch angle control method considering rapid active power adjustment of wind driven generator |
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- 2023-06-19 CN CN202310725331.0A patent/CN116928020A/en active Pending
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