CN113669198A - Method and system for controlling power of wind turbine generator under strong wind condition - Google Patents
Method and system for controlling power of wind turbine generator under strong wind condition Download PDFInfo
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- CN113669198A CN113669198A CN202111146697.XA CN202111146697A CN113669198A CN 113669198 A CN113669198 A CN 113669198A CN 202111146697 A CN202111146697 A CN 202111146697A CN 113669198 A CN113669198 A CN 113669198A
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000009467 reduction Effects 0.000 claims abstract description 11
- 238000010248 power generation Methods 0.000 claims abstract description 8
- 238000012545 processing Methods 0.000 claims description 9
- 238000011156 evaluation Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 238000010521 absorption reaction Methods 0.000 claims description 2
- 238000004364 calculation method Methods 0.000 claims description 2
- 230000000630 rising effect Effects 0.000 abstract description 3
- 238000011217 control strategy Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2270/00—Control
- F05B2270/10—Purpose of the control system
- F05B2270/101—Purpose of the control system to control rotational speed (n)
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2270/00—Control
- F05B2270/30—Control parameters, e.g. input parameters
- F05B2270/32—Wind speeds
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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
Abstract
The invention discloses a method and a system for controlling the power of a wind turbine generator under a strong wind condition, and belongs to the field of wind power generation. The wind speed meter is detected to judge whether the set value of the rotating speed of the generator and the set value of the torque of the generator need to be adjusted or not, the latest set value of the rotating speed reduction and the torque rising of the generator is calculated, the requirement of reducing the limit load of the unit under the condition of high wind is considered to the maximum extent, and meanwhile, the output power of the unit is kept unchanged without generating capacity loss. A torque set point rise value is calculated. The invention adopts a mode of reducing the rotating speed and increasing the torque of the generator as a power control mode under the condition of strong wind, thereby reducing the limit load of a large component under the condition of strong wind, simultaneously keeping the output power of the generator unchanged, and overcoming the problems that the output power of a unit is reduced and the generated energy is lost under the frequent wind condition of strong wind because the rotating speed and the torque of the generator are only reduced and the output power of the unit is unchanged in the traditional mode.
Description
Technical Field
The invention belongs to the field of wind power generation, and relates to a method and a system for controlling the power of a wind turbine generator under the condition of strong wind.
Background
The wind generating set has different power control strategies under different wind speeds, and after the rated wind speed is reached, the output power of the set is ensured to be maintained at the rated power by adopting a constant power or constant torque mode through the variable pitch control with the aim of controlling the rotating speed of the generator at a set point. Under the condition of strong wind, each large part of the wind generating set experiences large bending moment due to the action of wind power, certain influence is caused on the long-term safe operation of the set, the limit load of the set is reduced by generally adopting a power reduction mode for prolonging the cut-out wind speed, and the loss of generated energy is inevitably caused at the same time. Therefore, it is necessary to adjust the power control strategy of the unit, so that the unit adopts the adjusted power control strategy under the condition of strong wind, the limit load is reduced, and the power generation loss is avoided.
The existing technical scheme aiming at the problem comprises the following steps: and determining a set value for reducing the rotating speed of the generator according to the current wind speed of the wind generating set, so as to reduce the power and operate in a mode of being lower than the rated power. However, the existing control strategy inevitably causes power generation loss, and although the limit load of the generator set under the condition of strong wind can be effectively reduced, the power generation loss cannot be ignored under the condition of frequent strong wind at the expense of power generation loss due to power reduction operation.
Disclosure of Invention
The invention aims to overcome the defect that the generated energy loss is easily caused in a generator set control strategy under the condition of frequent strong wind in the prior art, and provides a method and a system for controlling the power of a generator set under the condition of strong wind.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a method for controlling the power of a wind turbine generator under the condition of strong wind comprises the following steps:
step 1) acquiring the real-time wind speed of a wind turbine generator;
step 2) obtaining a control function zone bit;
step 3) judging whether the state of the flag bit of the control function is an open state or a closed state;
when the control function flag bit is in a closed state, the control function flag bit continues to operate according to a rated rotating speed set value and a torque set value;
when the control function flag bit is in an open state, acquiring a wind speed-rotating speed set value relation table to obtain a rotating speed set value of each generator with reduced wind speed;
obtaining the latest power set value of the generator, and calculating to obtain an increased torque set value of the generator;
and transmitting the raised set value of the torque of the generator to the converter, and controlling the generator to keep the output power unchanged.
Preferably, the real-time wind speed acquisition is followed by a running average process.
Preferably, in step 2), the calculation process of the raised torque set value is: and under the condition of keeping the power unchanged, dividing the latest power set value of the generator by the reduced rotating speed set value of the generator to obtain an increased torque set value.
Preferably, the time of the moving average processing is 50 s.
Preferably, in step 3), the latest power set value of the generator is the sum of the rated power and the compensation power of the generator.
A wind turbine generator system power control system in high wind conditions, comprising:
the data acquisition unit is used for acquiring the real-time wind speed of the wind turbine generator, the rated power and the compensation power of the generator and acquiring a control function zone bit corresponding to each real-time wind speed;
the evaluation unit is interacted with the data acquisition unit and is used for judging whether the control function zone bit is correct or not;
and the data processing unit is respectively interacted with the data acquisition unit and the evaluation unit, comprises a rotating speed reduction module and a torque increasing module, obtains a latest power set value of the generator based on the judgment result of the control function zone bit and the rated power and the compensation power of the generator, further calculates to obtain a torque set value of the generator, and calculates to obtain the output power of the generator by combining the rotating speed set value of the generator.
Preferably, the data processing unit includes:
and the rotating speed reduction module is used for obtaining a rotating speed set value of each generator with reduced wind speed through the relation between the real-time wind speed and the rated rotating speed set value, and the variable pitch system starts to act at the moment to reduce the rotating speed through reducing the wind energy absorption.
Preferably, the data processing unit includes:
and the torque raising module is used for transmitting the improved torque set value to the converter, and the converter operates according to the torque set value to realize torque raising.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a method for controlling the power of a wind turbine generator set under a strong wind condition, which judges whether a set value of the rotating speed of a generator and a set value of the torque need to be adjusted or not by detecting an anemoscope, if so, the latest set value of the rotating speed reduction and the torque increase of the generator is calculated, the requirement of reducing the limit load of the generator set under the strong wind condition is considered to the maximum extent, and meanwhile, the output power of the generator set is ensured to be kept unchanged without generating capacity loss. The reduced speed set point is taken from a current wind speed look-up table and the torque set point increase is obtained by dividing the power by the reduced speed set point. The invention adopts a mode of reducing the rotating speed and increasing the torque of the generator as a power control mode under the condition of strong wind, thereby reducing the limit load of a large component under the condition of strong wind, simultaneously keeping the output power of the generator unchanged, and overcoming the problems that the output power of a unit is reduced and the generated energy is lost under the frequent wind condition of strong wind because the rotating speed and the torque of the generator are only reduced and the output power of the unit is unchanged in the traditional mode.
Further, since the disturbance signal exists in the measured wind speed, the measured wind speed signal is subjected to a moving average process.
The invention discloses a power control system of a wind generating set under a strong wind condition, which can schedule the set values of the rotating speed and the torque of a generator by taking the wind speed of an anemometer as a judgment condition, thereby controlling the power of the wind generating set under the strong wind condition. The method innovatively reduces the set rotating speed of the generator and improves the set torque of the generator under the condition of strong wind. Because the limit load under the condition of strong wind is in positive correlation with the running rotating speed of the generator, the rated rotating speed of the generator needs to be correspondingly reduced for effectively reducing the limit load, and the limit load of a large component is effectively reduced while the output power of the generator is kept unchanged under the condition of strong wind by improving the torque of the generator for compensating the loss of the generated energy at the moment. The invention innovatively reduces the rotating speed of the generator and simultaneously increases the torque of the generator, thereby reducing the limit load which the unit possibly encounters to protect the unit under strong wind, and pertinently improving the torque of the generator without generating power loss.
Drawings
Fig. 1 is a flow chart of a power control method of a wind turbine generator system under a strong wind condition.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
example 1
A method for controlling the power of a wind turbine generator under the condition of strong wind comprises the following steps:
step 1) acquiring the real-time wind speed of a wind turbine generator;
step 2) obtaining a control function zone bit;
step 3) judging whether the state of the flag bit of the control function is an open state or a closed state;
when the control function flag bit is in a closed state, the control function flag bit continues to operate according to a rated rotating speed set value and a torque set value;
when the control function flag bit is in an open state, acquiring a wind speed-rotating speed set value relation table to obtain a rotating speed set value of each generator with reduced wind speed;
obtaining the latest power set value of the generator, and calculating to obtain an increased torque set value of the generator;
and transmitting the raised set value of the torque of the generator to the converter, and controlling the generator to keep the output power unchanged.
Example 2
As shown in fig. 1, the anemometer wind speed is detected in the current detection period, and since an interference signal is present in the measured wind speed, the measured wind speed signal is subjected to a moving average process. And acquiring the current control function flag bit. And judging whether the flag bit of the control function is true, if the flag bit is false, namely the control function is not started, maintaining the power control strategy unchanged, and continuing to operate according to the original rotating speed set value and the torque set value.
And if the flag bit is true, acquiring a wind speed-rotating speed set value relation table, and obtaining a rotating speed set value of the generator reduced under the current wind speed through the detected anemometer wind speed table. And obtaining the rated power and the compensation power of the current generator to obtain the latest power set value of the generator. And obtaining the current set value of the torque of the generator by dividing the latest set value of the power of the generator by the set value of the rotating speed of the generator reduced under the current wind speed. Since the generator torque is inversely proportional to the generator speed, its generator torque will be higher than the original generator torque set value. The reduced generator speed set point and the increased generator torque set point are transmitted to a converter, which controls the generator to keep the output power constant.
Example 3
1) The invention judges whether the power control parameter of the unit needs to be further adjusted in real time by detecting the wind speed of the anemometer.
2) And detecting the wind speed of the current anemometer and transmitting a measurement signal to the master control PLC.
3) Due to the measurement mode, signal conversion, estimation method and the like of the anemometer measuring device, the directly obtained rotating speed measurement signal has interference components and is not suitable for directly participating in the control algorithm.
4) And carrying out 50-second sliding average on the currently measured wind speed of the anemometer to obtain the currently sliding average measured wind speed of the anemometer.
5) The control function flag region3powercontrol flag is obtained.
6) Thus, if the control function flag region3powercontrol flag is false, step 7 is entered.
7) And the unit continues to normally operate in the original power control mode.
8) Thus, if the control function flag region3powercontrol flag is true, step 9 is entered.
9) And acquiring a wind speed-rotating speed relation table.
10) And (4) correspondingly obtaining a set value for reducing the rotating speed of the generator corresponding to the current wind speed by looking up a table according to the wind speed obtained in the step (4).
11) And acquiring the current set power of the generator.
12) And acquiring the current generator compensation power.
13) And summing the current generator set power obtained in the step 11 and the current generator compensation power obtained in the step 12 to obtain the latest set power of the current generator.
14) And (4) dividing the latest set power of the current generator obtained in the step (13) by the set value of the rotating speed of the reduced generator obtained in the step (10) to obtain the set value of the rising torque of the current generator.
15) And (4) transmitting the set value of the reduced rotating speed of the generator calculated in the step (13) and the set value of the torque rising of the generator obtained in the step (14) to a converter, and controlling the generator to obtain output power.
Example 4
A wind turbine generator system power control system in high wind conditions, comprising:
the data acquisition unit is used for acquiring the real-time wind speed of the wind turbine generator, the rated power and the compensation power of the generator and acquiring a control function zone bit corresponding to each real-time wind speed;
the evaluation unit is interacted with the data acquisition unit and is used for judging whether the control function zone bit is correct or not;
and the data processing unit is respectively interacted with the data acquisition unit and the evaluation unit, comprises a rotating speed reduction module and a torque increasing module, obtains a latest power set value of the generator based on the judgment result of the control function zone bit and the rated power and the compensation power of the generator, further calculates to obtain a torque set value of the generator, and calculates to obtain the output power of the generator by combining the rotating speed set value of the generator.
It should be noted that, whether the flag bit of the control function in the control parameter list is in an open state or a closed state is checked; since the torque is obtained by dividing the power by the rotational speed, the product remains the same. The output power is the rotation speed multiplied by the torque, and the power is kept unchanged by increasing the rotation speed and reducing the torque.
In the prior art, in order to consider the ultimate load of main components of a fan at a high wind speed, a mode of reducing the rotating speed of a generator is generally adopted, and the rotation stress condition of the main components at the high wind speed is effectively relieved, so that the ultimate bending moment is reduced, and the ultimate load is reduced to protect a unit.
The invention adopts the mode that the anemoscope is directly adopted to measure the wind speed as the condition for judging the strong wind, but the invention is not limited to the mode, and other conditions for judging the strong wind such as the change of the pitch angle, the change of the pitch rate and the like can also be adopted. The wind speed is measured directly by the anemometer as a reference for setting the generator rotational speed reduction set value, but the method is not limited to this, and other methods such as a pitch angle and the like can be used. The present invention adopts the setting of the set value of the generator speed reduction, but is not limited to this manner, and other setting such as setting the set value of the generator torque lifting can be adopted. The invention adopts a mode of increasing the compensating power of the generator to ensure the output power of the generator, but is not limited to the mode, and other modes such as the mode of increasing the torque of the generator and the like can be adopted.
In summary, the invention adopts a mode of reducing the rotating speed of the generator and increasing the torque of the generator, but the side current of the generator is also increased due to the increase of the torque of the generator, and the running loss of the generator, the loss of a transmission cable, the loss of a converter and the like are correspondingly increased, so that a compensation power value is innovatively introduced, the loss increase caused by the increase of the torque of the generator is considered, and the output power of the generator is ensured to be kept unchanged in the process of reducing the rotating speed and increasing the torque through the setting of the compensation power. When the rotating speed of the generator is reduced, the slope is set at the rated rotating speed which is not more than 10 percent, the target rotating speed value is reduced, and the instability of the running state of the unit caused by the large change of the set rotating speed value is prevented.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (8)
1. A method for controlling the power of a wind turbine generator under the condition of strong wind is characterized by comprising the following steps:
step 1) acquiring the real-time wind speed of a wind turbine generator;
step 2) obtaining a control function zone bit;
step 3) judging whether the state of the flag bit of the control function is an open state or a closed state;
when the control function flag bit is in a closed state, the control function flag bit continues to operate according to a rated rotating speed set value and a torque set value;
when the control function flag bit is in an open state, acquiring a wind speed-rotating speed set value relation table to obtain a rotating speed set value of each generator with reduced wind speed;
obtaining the latest power set value of the generator, and calculating to obtain an increased torque set value of the generator;
and transmitting the raised set value of the torque of the generator to the converter, and controlling the generator to keep the output power unchanged.
2. The method of claim 1, wherein the moving average is performed after the real-time wind speed is obtained.
3. The method for controlling the power of the wind power generation unit under the strong wind condition according to claim 1, wherein in the step 2), the calculation process of the raised torque set value is as follows: and under the condition of keeping the power unchanged, dividing the latest power set value of the generator by the reduced rotating speed set value of the generator to obtain an increased torque set value.
4. The method of claim 2, wherein the time for the moving average processing is 50 s.
5. The method for controlling the power of the wind power generation unit under the strong wind condition as claimed in claim 1, wherein in the step 3), the latest power set value of the generator is the sum of the rated power and the compensation power of the generator.
6. A system for controlling the power of a wind turbine generator in high wind conditions, comprising:
the data acquisition unit is used for acquiring the real-time wind speed of the wind turbine generator, the rated power and the compensation power of the generator and acquiring a control function zone bit corresponding to each real-time wind speed;
the evaluation unit is interacted with the data acquisition unit and is used for judging whether the control function zone bit is correct or not;
and the data processing unit is respectively interacted with the data acquisition unit and the evaluation unit, comprises a rotating speed reduction module and a torque increasing module, obtains a latest power set value of the generator based on the judgment result of the control function zone bit and the rated power and the compensation power of the generator, further calculates to obtain a torque set value of the generator, and calculates to obtain the output power of the generator by combining the rotating speed set value of the generator.
7. The system of claim 6, wherein the data processing unit comprises:
and the rotating speed reduction module is used for obtaining a rotating speed set value of each generator with reduced wind speed through the relation between the real-time wind speed and the rated rotating speed set value, and the variable pitch system starts to act at the moment to reduce the rotating speed through reducing the wind energy absorption.
8. The system according to claim 6 or 7, wherein the data processing unit comprises:
and the torque raising module is used for transmitting the improved torque set value to the converter, and the converter operates according to the torque set value to realize torque raising.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111146697.XA CN113669198B (en) | 2021-09-28 | 2021-09-28 | Method and system for controlling power of wind turbine generator under strong wind condition |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111146697.XA CN113669198B (en) | 2021-09-28 | 2021-09-28 | Method and system for controlling power of wind turbine generator under strong wind condition |
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| CN113669198A true CN113669198A (en) | 2021-11-19 |
| CN113669198B CN113669198B (en) | 2022-11-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116896296A (en) * | 2023-09-07 | 2023-10-17 | 福建华电福瑞能源发展有限公司 | Method and system for controlling power of wind generating set at cut-out wind speed |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103595316A (en) * | 2013-11-25 | 2014-02-19 | 北京金风科创风电设备有限公司 | Generator electromagnetic torque compensation control method for wind turbine generator |
| CN109578203A (en) * | 2017-09-28 | 2019-04-05 | 中车株洲电力机车研究所有限公司 | Active load shedding control method and device under wind power generating set extreme operating condition |
| CN111861067A (en) * | 2019-04-30 | 2020-10-30 | 北京金风科创风电设备有限公司 | Loss compensation control method and device for wind turbine generator |
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2021
- 2021-09-28 CN CN202111146697.XA patent/CN113669198B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103595316A (en) * | 2013-11-25 | 2014-02-19 | 北京金风科创风电设备有限公司 | Generator electromagnetic torque compensation control method for wind turbine generator |
| CN109578203A (en) * | 2017-09-28 | 2019-04-05 | 中车株洲电力机车研究所有限公司 | Active load shedding control method and device under wind power generating set extreme operating condition |
| CN111861067A (en) * | 2019-04-30 | 2020-10-30 | 北京金风科创风电设备有限公司 | Loss compensation control method and device for wind turbine generator |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116896296A (en) * | 2023-09-07 | 2023-10-17 | 福建华电福瑞能源发展有限公司 | Method and system for controlling power of wind generating set at cut-out wind speed |
| CN116896296B (en) * | 2023-09-07 | 2023-12-01 | 福建华电福瑞能源发展有限公司 | Method and system for controlling power of wind generating set at cut-out wind speed |
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