CN112664393B - Fan active power control method based on maximum invariant paddle wind speed range index - Google Patents

Fan active power control method based on maximum invariant paddle wind speed range index Download PDF

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CN112664393B
CN112664393B CN202011535198.5A CN202011535198A CN112664393B CN 112664393 B CN112664393 B CN 112664393B CN 202011535198 A CN202011535198 A CN 202011535198A CN 112664393 B CN112664393 B CN 112664393B
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fan
wind
wind speed
speed range
pitch
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CN112664393A (en
Inventor
殷明慧
卜京
顾伟
陈载宇
周连俊
张刘冬
杨炯明
汪成根
邹云
孙蓉
刘建坤
李强
彭云
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Nanjing University of Science and Technology
State Grid Jiangsu Electric Power Co Ltd
Jiangsu Goldwind Science and Technology Co Ltd
Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd
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Nanjing University of Science and Technology
State Grid Jiangsu Electric Power Co Ltd
Jiangsu Goldwind Science and Technology Co Ltd
Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd
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    • 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

Abstract

The invention discloses a method for controlling active power of a fan based on a maximum invariant pitch wind speed range index, aiming at solving the problem that the variable speed of a wind wheel is not utilized to the maximum extent to relieve the variable pitch action in the existing research, and the method comprises the following steps: acquiring related parameters of a fan; obtaining the maximum non-variable pitch wind speed range of the fan according to fan stability analysis; establishing an index of a wind speed range of the constant propeller; realizing active power control based on the maximum invariant paddle wind speed range; and evaluating the maximum pitch-unchanging wind speed range based on the pitch-unchanging wind speed range index so as to evaluate the active power control method of the fan. The improved fan active power control method based on the maximum unchanged paddle wind speed range can maximally utilize the wind wheel to change the speed to cope with wind speed disturbance, further reduce the paddle changing action of the fan and relieve the fatigue load of a paddle changing mechanism.

Description

Fan active power control method based on maximum invariant paddle wind speed range index
Technical Field
The invention belongs to the field of fan control, and particularly relates to an improved fan active power control method based on a maximum invariant pitch wind speed range index.
Background
With the improvement of the wind power permeability, the variable-speed variable-pitch wind turbine generator is gradually developed into a main power supply of a power system. In order to overcome large fluctuation of wind power caused by wind speed change and reduce frequency modulation pressure of a conventional unit, a power system urgently needs the wind power unit to participate in AGC. In the AGC operation mode, the wind turbine generator does not maximize the generating benefit as an operation target any more, but actively controls the output electromagnetic power to track the power grid instruction, and further supports the active power balance of the power system.
For the AGC mode of operation, the electromagnetic power needs to track the grid instructions, resulting in that the aerodynamic power dominated by the wind speed is completely uncorrelated with the change of the electromagnetic power, and the wind turbine will be subjected to unbalanced power with larger amplitude and faster change. This not only makes the fan stable difficult to maintain, leads to frequent change oar action moreover, increases the tired degree of change oar mechanism. This problem is particularly important for wind turbines designed for single-machine efficient operating modes but participating in AGC.
Aiming at the problem, in the face of imbalance of pneumatic power and electromagnetic power, the existing research provides a wind wheel priority speed changing strategy, namely, a fan is controlled to a new stable balance point by preferentially utilizing rotation speed regulation instead of pitch angle regulation, so that frequent pitch regulation is relieved. Although the existing research continuously improves the utilization degree of the variable speed of the wind wheel and reduces the pitch variation action of the wind turbine to a certain extent, the quantitative analysis of the utilization degree of the variable speed of the wind wheel and the pitch variation alleviation degree of the wind wheel is lacked. This makes it difficult to evaluate comprehensively and compare the effect and degree of the variable-pitch action of the wind turbine using variable speed in different methods, which in turn makes it difficult to analyze the maximum utilization degree of variable speed of the wind turbine, and affects the further optimization and improvement of the active power control method.
Disclosure of Invention
The invention aims to provide a fan active power control method based on a maximum non-variable-pitch wind speed range index, which enlarges the variable speed range of a wind wheel, furthest utilizes the variable speed of the wind wheel to relieve the variable pitch action, further reduces the variable pitch action of the fan and relieves the fatigue load of a variable pitch mechanism.
The technical solution for realizing the purpose of the invention is as follows: a fan active power control method based on a maximum non-variable pitch wind speed range index comprises the following steps:
step 1, obtaining relevant parameters of a fan, including air density rho, wind wheel radius R and rated rotating speed omega N Pitch angle state β, maximum wind energy utilization factor corresponding to pitch angle β
Figure BDA0002852929970000011
Optimum tip speed ratio
Figure BDA0002852929970000012
Power instruction P cmd The rotating speed omega of the wind wheel;
step 2, obtaining the maximum non-variable-pitch wind speed range of the fan according to fan stability analysis;
step 3, establishing a non-variable pitch wind speed range index;
and 4, realizing active power control based on the maximum non-variable pitch wind speed range.
Further, step 2, according to the fan stability analysis, obtaining the maximum non-variable pitch wind speed range of the fan, and the specific process comprises:
maximum non-variable pitch wind speed range of fan
Figure BDA0002852929970000021
The definition is as follows: for a given power command P cmd And a pitch angle beta, wherein a wind speed maximum variation range of a fan which can reach a stable balance point only through the speed change of a wind wheel exists, and the upper boundary and the lower boundary of the maximum non-variable-pitch wind speed range are respectively
Figure BDA0002852929970000022
And
Figure BDA0002852929970000023
and satisfies the following relationship:
Figure BDA0002852929970000024
Figure BDA0002852929970000025
in the formula, C P The wind energy utilization coefficient.
Further, step 3 is the non-variable pitch wind speed range index
Figure BDA0002852929970000026
Comprises the following steps:
Figure BDA0002852929970000027
β i+1 ＝β i +Δβ
in the formula, beta i Representing pitch angle, β max Maximum value of pitch angle, v u (β i )、v l (β i ) Respectively pitch angle of beta i The upper boundary and the lower boundary of the time-invariant pitch wind speed range, and delta beta is the step length of the pitch angle.
Further, step 4 specifically includes:
step 4-1, determining a wind wheel speed change interval corresponding to the maximum non-variable-pitch wind speed range
Figure BDA0002852929970000028
Step 4-2, determining a pitch angle instruction beta according to the relation between the wind wheel rotating speed signal omega and the wind wheel variable speed interval ref Specifically, the method comprises the following steps:
when in use
Figure BDA0002852929970000029
In time, the current value of the pitch angle instruction of the fan is kept unchanged;
when in use
Figure BDA00028529299700000210
Increasing a fan pitch angle instruction;
when the temperature is higher than the set temperature
Figure BDA00028529299700000211
And meanwhile, reducing the pitch angle instruction of the fan.
Further, the upper limit of the rotation speed of the range of the gear change in step 4-1
Figure BDA00028529299700000212
Namely the rated speed omega of the fan for ensuring the safe operation of the fan N Boundary at rotational speed
Figure BDA0002852929970000034
Lower boundary of maximum constant propeller wind speed range
Figure BDA0002852929970000035
Correspondingly, the calculation formula is as follows:
Figure BDA0002852929970000031
further, when the above is mentioned
Figure BDA0002852929970000036
And increasing a pitch angle instruction of the fan, wherein the specific determination form of the pitch angle instruction is as follows:
Figure BDA0002852929970000032
in the formula, K uP 、K uI Respectively a proportionality coefficient and an integral coefficient in the process of adjusting the pitch angle upwards,
Figure BDA0002852929970000037
the upper boundary of the wind turbine speed change interval.
Further, when the above is mentioned
Figure BDA0002852929970000038
And then, reducing a pitch angle instruction of the fan, wherein the specific determination form of the pitch angle instruction is as follows:
Figure BDA0002852929970000033
in the formula, K lP 、K lI Respectively a proportionality coefficient and an integral coefficient during pitch angle down-regulation,
Figure BDA0002852929970000039
the lower boundary of the wind turbine speed change interval.
Further, the method also includes:
and 5, evaluating the maximum constant pitch wind speed range based on the constant pitch wind speed range index, and further evaluating the active power control method of the fan.
Compared with the prior art, the invention has the following remarkable advantages: 1) Starting from the disturbance resistance of the variable speed of the wind wheel, an index of the wind speed range of the unchanged pitch is defined, the index reflects the bearable disturbance range when the existing method only utilizes the rotation speed regulation without triggering the pitch variation action, and the effect of relieving the pitch variation action by utilizing the variable speed of the wind wheel, so that the degree and the effect of relieving the pitch variation action by utilizing the variable speed of the wind wheel in the existing control method can be quantitatively analyzed and compared; 2) The maximum non-variable-pitch wind speed range of the fan is provided, the maximum wind speed change range which can be borne by the fan only by utilizing the rotation speed regulation is reflected, and the maximum possible effect of relieving the variable-pitch action based on the wind wheel speed change is achieved; 3) The speed change range of the wind wheel is determined according to the stability analysis of the fan, the speed change range is expanded, the speed change of the wind wheel can be more fully utilized to relieve the pitch variation action, and the pitch variation action of the fan and the fatigue load of a pitch variation mechanism are further reduced.
The present invention is described in further detail below with reference to the attached drawing figures.
Drawings
Fig. 1 is a flowchart of a method for controlling active power of a wind turbine based on a maximum invariant pitch range index according to the present invention.
Fig. 2 is a schematic analysis diagram of a non-pitch wind speed range for the existing method, wherein both diagrams (a) and (b) are schematic analysis diagrams of a non-pitch wind speed range for the existing method.
FIG. 3 is a schematic diagram of a non-pitch wind speed range under different pitch angles in the prior art.
Fig. 4 is a control block diagram of the method for controlling the active power of the wind turbine based on the maximum pitch-invariant wind speed range index.
Fig. 5 is a simulation experiment result of validity verification of the present invention in an embodiment, including a wind turbine rotational speed trajectory and a pitch angle trajectory according to an improved method and a conventional method proposed by the present invention, where fig. (a) is the wind turbine rotational speed trajectory and fig. (b) is the pitch angle trajectory.
FIG. 6 is a diagram illustrating a relationship between a statistical indicator of the amount of wind movement of the wind turbine and an indicator of a wind speed range of the non-variable blades according to different methods in an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In one embodiment, in conjunction with fig. 1 and 4, there is provided a method for controlling active power of a wind turbine based on a maximum invariant pitch wind speed range indicator, the method comprising the steps of:
step 1, acquiring relevant parameters of a fan, including air density rho, wind wheel radius R and rated rotating speed omega N Pitch angle state β, maximum wind energy utilization factor corresponding to pitch angle β
Figure BDA0002852929970000041
Optimum tip speed ratio
Figure BDA0002852929970000042
Power instruction P cmd The rotating speed omega of the wind wheel;
step 2, obtaining the maximum non-variable-pitch wind speed range of the fan according to fan stability analysis;
step 3, establishing a non-variable pitch wind speed range index;
step 4, realizing active power control based on the maximum non-variable pitch wind speed range;
and 5, evaluating the maximum pitch-unchanging wind speed range based on the pitch-unchanging wind speed range index, and further evaluating the active power control method of the fan.
Further, in one embodiment, the specific analysis of step 2 is as follows:
firstly, analyzing the wind speed range of the non-variable propeller corresponding to different methods according to the implementation principles of the existing different methods, wherein the specific method comprises the following steps:
wind speed range U of constant propeller of control method v The definition is as follows: for a given power command P cmd And pitch angle β, there is a range of wind speeds [ v ] l (β),v u (β)]And as long as the changed wind speed is within the range, the control method can enable the fan to operate to a stable balance point after the wind speed is disturbed only through rotating speed adjustment, and the wind speed range is called as the constant-propeller wind speed range of the control method. If the wind speed is beyond the range, the control method needs to start the pitch angle adjustment.
(1) PAC process. As long as the wind speed fluctuates, the method starts pitch angle adjustment and controls the rotating speed of the wind wheel at a fixed value, namely:
Figure BDA0002852929970000051
wherein the content of the first and second substances,
Figure BDA0002852929970000052
is the maximum wind energy utilization coefficient corresponding to the zero-degree pitch angle,
Figure BDA0002852929970000053
the optimal blade tip speed ratio corresponding to the zero-degree pitch angle. As shown in FIG. 2, the stable balance point of the fan changes in a process A 1 →A 2 →A 3 →A 1 。
(2) RSC method. The method can only change the speed by using the zero-degree pitch angle wind wheel, and when the rotating speed of the wind wheel reaches the rated rotating speed, the method degenerates to constant rotating speed control depending on pitch angle adjustment at the rated rotating speed. When the wind speed is from v, as shown in FIG. 2 1 Is raised to v 2 、v 3 Then reduced to v 2 In the mean time, the change process of the stable balance point of the fan is B 1 →B 2 →B 3 →B 4 。
(3) CAPC method. The method simultaneously adjusts the rotating speed and the pitch angle of the wind wheel to ensure that the wind wheel stabilizes the balance point
Figure BDA0002852929970000056
The following relationship is satisfied:
Figure BDA0002852929970000054
as shown in FIG. 2, the variation process of the stable balance point of the fan is C 1 →C 2 →C 3 →C 1 . Wherein the content of the first and second substances,
Figure BDA0002852929970000055
the optimum tip speed ratio for the pitch angle β.
(4) IAPC methods. Unlike the RSC method, the method can utilize wind turbine speed change at any pitch angle. When the wind speed is from v, as shown in FIG. 2 1 Is raised to v 3 The variation process of the stable balance point of the fan is the same as that of the RSC method (B) 1 /D 1 →B 2 /D 2 →B 3 /D 3 ). When the wind speed is from v 3 Down to v 2 The stable balance point of the fan under the method is from D 3 Change to D 4 Only the rotational speed is changed and the pitch angle remains unchanged from the current value.
According to the implementation principle of the existing different methods, the non-variable pitch wind speed ranges of the different methods under different pitch angles are analyzed as shown in FIG. 3. When the wind turbine applies the PAC and CAPC methods, any wind speed fluctuations cause a pitching action, which means that the constant pitch wind speed range at all pitch angles is zero for both methods. The RSC method only has a non-variable-pitch wind speed range under the zero-degree pitch angle, and the IAPC method has the non-variable-pitch wind speed range under all the pitch angles.
Through the analysis of the capability and the effect of the existing method for relieving the variable pitch action by utilizing the variable speed of the wind wheel and the maximum capability of the fan for relieving the variable pitch action by utilizing the variable speed of the wind wheel, the invention enlarges the maximum non-variable pitch wind speed range of the fan according to the stability analysis of the fan, and the method specifically comprises the following steps:
maximum non-variable pitch wind speed range of fan
Figure BDA0002852929970000064
The definition is as follows: for a given power command P cmd And a pitch angle beta, wherein a wind speed maximum variation range of a fan which can reach a stable balance point only through the speed change of a wind wheel exists, and the upper boundary and the lower boundary of the maximum non-variable-pitch wind speed range are respectively
Figure BDA0002852929970000065
And
Figure BDA0002852929970000066
and satisfies the following relationship:
Figure BDA0002852929970000061
Figure BDA0002852929970000062
in the formula, C P The wind energy utilization coefficient.
The maximum non-variable-pitch wind speed range reflects the maximum wind speed change range which can be borne by the fan only through rotating speed adjustment, and the maximum possible effect of relieving the variable-pitch action based on the variable speed of the wind wheel, the variable speed of the wind wheel is utilized to the maximum extent to relieve the variable-pitch action, so that the variable-pitch action of the fan is further reduced, and the fatigue load of a variable-pitch mechanism is relieved.
Further, in one embodiment, the non-variable pitch wind speed range index in step 3
Figure BDA0002852929970000067
Comprises the following steps:
Figure BDA0002852929970000063
β i+1 ＝β i +Δβ
in the formula, beta i Representing pitch angle, β max Maximum value of pitch angle, v u (β i )、v l (β i ) Respectively pitch angle of beta i The time is not changed at the upper boundary and the lower boundary of the wind speed range of the propeller, and delta beta is the step length of the pitch angle.
Here, β is based on a number of simulation studies i Empirically, the range is 0-20 degrees, and the step length delta beta is 5 degrees.
The invention provides the wind speed range index without variable pitch based on the disturbance resistance of variable speed of the wind wheel. The index reflects the bearable disturbance range when the existing method only utilizes the rotation speed regulation without triggering the variable pitch action, and the effect of utilizing the wind wheel to change the speed and relieve the variable pitch action.
Further, in one embodiment, step 4 specifically includes:
step 4-1, determining the wind wheel variable speed corresponding to the maximum non-variable-pitch wind speed rangeInterval(s)
Figure BDA0002852929970000068
Step 4-2, determining a pitch angle instruction beta according to the relation between the wind wheel rotating speed signal omega and the wind wheel variable speed interval ref Specifically, the method comprises the following steps:
when in use
Figure BDA0002852929970000069
Meanwhile, keeping the current value of the pitch angle instruction of the fan unchanged;
when the temperature is higher than the set temperature
Figure BDA00028529299700000610
Increasing the pitch angle instruction of the fan;
when in use
Figure BDA0002852929970000074
And meanwhile, reducing the pitch angle instruction of the fan.
Further, in one embodiment, the upper limit of the rotation speed of the gear shift range in step 4-1
Figure BDA0002852929970000075
Namely the rated speed omega of the fan for ensuring the safe operation of the fan N Lower boundary of rotation speed
Figure BDA0002852929970000076
Lower boundary of maximum constant propeller wind speed range
Figure BDA0002852929970000077
Correspondingly, the calculation formula is as follows:
Figure BDA0002852929970000071
further, in one embodiment, the method is as described in
Figure BDA0002852929970000078
Time, increase the fanThe specific determination form of the pitch angle instruction is as follows:
Figure BDA0002852929970000072
in the formula, K uP 、K uI Respectively a proportionality coefficient and an integral coefficient in the process of adjusting the pitch angle upwards,
Figure BDA0002852929970000079
the upper boundary of the wind turbine speed change interval.
Further, in one embodiment, the method is as described above
Figure BDA00028529299700000710
And reducing a pitch angle instruction of the fan, wherein the specific determination form of the pitch angle instruction is as follows:
Figure BDA0002852929970000073
in the formula, K lP 、K lI Respectively a proportionality coefficient and an integral coefficient during pitch angle down-regulation,
Figure BDA00028529299700000711
the lower boundary of the wind turbine speed change interval.
Further, in one embodiment, the step 5 of evaluating the maximum unchanged-propeller wind speed range based on the unchanged-propeller wind speed range index, and further evaluating an active power control method of the wind turbine specifically includes:
obtaining a variable propeller motion quantity statistical index, establishing a relation between the variable propeller motion quantity statistical index and an invariable propeller wind speed range index, and if the variable propeller motion quantity of the fan is reduced along with the increase of the invariable propeller wind speed range, indicating that the invariable propeller wind speed range index is effective, further indicating that the maximum invariable propeller wind speed range is effective, wherein the fan active power control method is effective.
As a specific example, in one of the embodiments, the invention is further described.
This example utilizes open-source professional wind turbine simulation software FAST (Fatigue, aerodynamics, structures, and Turbulence) provided by National Renewable Energy Laboratory (NREL) to simulate and verify effects. The wind turbine model adopts a CART 3 blade test model with the capacity of 600kW, and the specific parameters are shown in the following table 1.
TABLE 1 CART 3 blade tester type main parameters with capacity of 600kW
Figure BDA0002852929970000081
The invention discloses an improved active power control method of a fan based on the maximum unchanged propeller wind speed range, which comprises the following steps:
1. obtaining relevant parameters of the fan, including air density rho, wind wheel radius R and rated rotating speed omega N Pitch angle state β, maximum wind energy utilization factor corresponding to pitch angle β
Figure BDA0002852929970000085
Optimum tip speed ratio
Figure BDA0002852929970000086
Power command P cmd The rotating speed omega of the wind wheel;
2. obtaining the maximum non-variable pitch wind speed range of the fan according to fan stability analysis; the method specifically comprises the following steps:
maximum non-variable pitch wind speed range of fan
Figure BDA0002852929970000087
The definition is as follows: for a given power command P cmd And a pitch angle beta, wherein the maximum wind speed change range of a fan which can reach a stable balance point only through the speed change of a wind wheel exists, and the upper boundary and the lower boundary of the maximum unchanged paddle wind speed range are respectively
Figure BDA0002852929970000088
And
Figure BDA0002852929970000089
and satisfies the following relationship:
Figure BDA0002852929970000082
Figure BDA0002852929970000083
in the formula, C P The wind energy utilization coefficient.
3. Establishing an index of the wind speed range of the constant propeller
Figure BDA00028529299700000810
Comprises the following steps:
Figure BDA0002852929970000084
β i+1 ＝β i +Δβ
in the formula, beta i Representing pitch angle, β max Maximum value of pitch angle, v u (β i )、v l (β i ) Respectively pitch angle of beta i The time is not changed at the upper boundary and the lower boundary of the wind speed range of the propeller, and delta beta is the step length of the pitch angle.
4. Realizing active power control based on the biggest invariable oar wind speed scope, specifically include:
4-1, determining a wind wheel speed change interval corresponding to the maximum non-variable-pitch wind speed range
Figure BDA0002852929970000095
Wherein upper limit of rotation speed
Figure BDA0002852929970000096
Namely the rated speed omega of the fan for ensuring the safe operation of the fan N Boundary at rotational speed
Figure BDA0002852929970000097
Lower boundary of maximum constant propeller wind speed range
Figure BDA0002852929970000098
Correspondingly, the calculation formula is as follows:
Figure BDA0002852929970000091
4-2, determining a pitch angle instruction beta according to the relation between the wind wheel rotating speed signal omega and the wind wheel variable speed interval ref Specifically:
when the temperature is higher than the set temperature
Figure BDA0002852929970000099
In time, the current value of the pitch angle instruction of the fan is kept unchanged;
when in use
Figure BDA00028529299700000910
And increasing a pitch angle instruction of the fan, wherein the specific determination form of the pitch angle instruction is as follows:
Figure BDA0002852929970000092
in the formula, K uP 、K uI Respectively a proportionality coefficient and an integral coefficient in the process of adjusting the pitch angle upwards,
Figure BDA00028529299700000911
the upper boundary of the wind turbine speed change interval.
When the temperature is higher than the set temperature
Figure BDA00028529299700000912
And then, reducing a pitch angle instruction of the fan, wherein the specific determination form of the pitch angle instruction is as follows:
Figure BDA0002852929970000093
in the formula, K lP 、K lI Respectively a proportionality coefficient and an integral coefficient in the process of adjusting the pitch angle downwards,
Figure BDA00028529299700000913
the lower boundary of the wind turbine speed change interval.
5. Under the same simulated wind speed and power instruction scene setting, the four existing methods and the improved method provided by the invention are simulated to obtain the statistical index of the variable pitch action amount of the fan under the five methods. The wind wheel rotating speed track and the pitch angle track of the fan under different methods are shown in fig. 5, and the statistical index of the variable pitch action quantity of the fan is shown in the following table 2.
TABLE 2 statistical index of fan pitch variation action
Figure BDA0002852929970000094
Comparing the wind speed range index of the non-variable propeller and the statistical index of the variable propeller action amount of the five methods, and establishing a relation between the statistical index of the variable propeller action amount and the wind speed range index of the non-variable propeller, as shown in fig. 6. As can be seen from table 2, fig. 5, and fig. 6, as the range of the wind speed of the constant pitch increases, the amount of the variable-pitch motion of the wind turbine decreases, which indicates that the range index of the wind speed of the constant pitch provided by the present invention is effective.
The simulation experiment results show that the improved fan active power control method based on the maximum invariant pitch wind speed range index can further reduce the pitch variation action of the fan and relieve the fatigue load of the pitch variation mechanism, and the effectiveness and the practicability of the improved method are verified.
The foregoing shows and describes the general principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (3)

1. A fan active power control method based on a maximum non-variable pitch wind speed range index is characterized by comprising the following steps:
step 1, obtaining relevant parameters of a fan, including air density rho, wind wheel radius R and rated rotating speed omega N Pitch angle state β, maximum wind energy utilization factor corresponding to pitch angle β
Figure FDA0003953535370000011
Optimum tip speed ratio
Figure FDA0003953535370000012
Power instruction P cmd The rotation speed omega of the wind wheel;
step 2, obtaining the maximum non-variable-pitch wind speed range of the fan according to fan stability analysis; the specific process comprises the following steps:
maximum non-variable pitch wind speed range of fan
Figure FDA0003953535370000013
The definition is as follows: for a given power command P cmd And a pitch angle beta, wherein the maximum wind speed change range of a fan which can reach a stable balance point only through the speed change of a wind wheel exists, and the upper boundary and the lower boundary of the maximum unchanged paddle wind speed range are respectively
Figure FDA0003953535370000014
And
Figure FDA0003953535370000015
and satisfies the following relationship:
Figure FDA0003953535370000016
Figure FDA0003953535370000017
in the formula, C P The wind energy utilization coefficient;
step 3, establishing a non-variable pitch wind speed range index
Figure FDA0003953535370000018
Comprises the following steps:
Figure FDA0003953535370000019
in the formula, beta i Representing pitch angle, β max At the maximum value of the pitch angle, v u (β i )、v l (β i ) Respectively pitch angle of beta i The upper boundary and the lower boundary of the time-invariant pitch wind speed range, and delta beta is the step length of the pitch angle;
step 4, realizing active power control based on the maximum non-variable pitch wind speed range, and specifically comprising the following steps of:
step 4-1, determining a wind wheel speed change interval corresponding to the maximum non-variable-pitch wind speed range
Figure FDA00039535353700000110
Upper limit of rotational speed of wind turbine speed change interval
Figure FDA00039535353700000111
Namely the rated speed omega of the fan for ensuring the safe operation of the fan N Boundary at rotational speed
Figure FDA00039535353700000112
Lower boundary of maximum constant propeller wind speed range
Figure FDA00039535353700000113
Correspondingly, the calculation formula is as follows:
Figure FDA00039535353700000114
step 4-2, determining a pitch angle instruction beta according to the relation between the wind wheel rotating speed signal omega and the wind wheel variable speed interval ref Specifically, the method comprises the following steps:
when the temperature is higher than the set temperature
Figure FDA0003953535370000021
Meanwhile, keeping the current value of the pitch angle instruction of the fan unchanged;
when in use
Figure FDA0003953535370000022
Increasing a fan pitch angle instruction;
when the temperature is higher than the set temperature
Figure FDA0003953535370000023
When the wind power generation system is used, reducing a pitch angle instruction of the fan;
in the above-mentioned
Figure FDA0003953535370000024
And increasing a pitch angle instruction of the fan, wherein the specific determination form of the pitch angle instruction is as follows:
Figure FDA0003953535370000025
in the formula, K uP 、K uI Respectively a proportionality coefficient and an integral coefficient in the process of adjusting the pitch angle upwards,
Figure FDA0003953535370000026
the upper boundary of the wind wheel speed change interval;
in the above-mentioned
Figure FDA0003953535370000027
And reducing a pitch angle instruction of the fan, wherein the specific determination form of the pitch angle instruction is as follows:
Figure FDA0003953535370000028
in the formula, K lP 、K lI Respectively a proportionality coefficient and an integral coefficient during pitch angle down-regulation,
Figure FDA0003953535370000029
the lower boundary of the wind turbine speed change interval.
2. The method for controlling the active power of the wind turbine based on the wind speed range index of the maximum invariant paddle according to claim 1, wherein the method further comprises:
and 5, evaluating the maximum pitch-unchanging wind speed range based on the pitch-unchanging wind speed range index, and further evaluating the active power control method of the fan.
3. The method for controlling the active power of the wind turbine based on the wind speed range index of the maximum invariant paddle according to claim 2, wherein the step 5 of evaluating the wind speed range of the maximum invariant paddle based on the wind speed range index of the maximum invariant paddle to further evaluate the method for controlling the active power of the wind turbine specifically comprises:
obtaining a variable propeller motion quantity statistical index, establishing a relation between the variable propeller motion quantity statistical index and an invariable propeller wind speed range index, and if the variable propeller motion quantity of the fan is reduced along with the increase of the invariable propeller wind speed range, indicating that the invariable propeller wind speed range index is effective, further indicating that the maximum invariable propeller wind speed range is effective, wherein the fan active power control method is effective.
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