CN113890062A - A method for primary frequency modulation power control of wind turbines - Google Patents
A method for primary frequency modulation power control of wind turbines Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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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
- Y02E10/76—Power conversion electric or electronic aspects
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Abstract
The invention provides a method for controlling primary frequency modulation power of a wind generating set, which calculates frequency modulation active power by detecting frequency variation of a grid-connected point, adds the frequency modulation active power with the current active power and calculates corresponding target values of the rotating speed and the torque of a generator. Meanwhile, the limit value of the active power change rate of the generator is scheduled in the range of the grid connection point frequency change and is correspondingly decomposed into the limit value of the rotation speed change rate of the generator and the limit value of the torque change rate of the generator. And the two limits are used for limiting the process change rate of the current generator speed/torque to the frequency modulation target value. The invention can be used for scheduling different active power change rate limit values in different frequency change ranges and influencing the rotating speed and torque change rate limit values of the generator. By the method, the requirement on rapidity of active power regulation of the generator caused by frequency modulation requirements can be effectively improved, and the requirement of a primary frequency modulation function on the response time of the wind generating set is met.
Description
Technical Field
The invention relates to the field of wind power generation, in particular to a method for controlling primary frequency modulation power of a wind generating set.
Background
With the increasing incorporation of more and more wind generating sets into the power grid, the influence on the power grid frequency is greater and greater due to the characteristics of randomness, intermittency and the like of wind power generation. Therefore, the primary frequency modulation function is more and more emphasized in the control strategy of the grid-connected friendliness of the wind generating set. When the frequency of the power grid rises or falls, the active power of the whole wind generating set is required to be reduced or increased to support the stability of the frequency of the power grid.
The existing technical scheme aiming at the problem comprises the following steps: and according to the detected frequency change of the grid-connected point, taking an active power instruction which needs to be increased or decreased through primary frequency modulation as a total frequency modulation active power target value, and calculating a generator torque target value and a generator rotating speed target value according to an active power value at the current moment. However, the active power change rate needs to be limited in the adjustment process, so that the influence on the normal running state of the unit caused by the violent change of the target value of the torque and the target value of the rotating speed of the generator is avoided. However, the active power change rate limit value is a fixed value, and the change range of the required active power target value is inconsistent due to inconsistent change range of the grid-connected point frequency, and the adoption of the same active power change rate limit value can cause that the response time is correspondingly prolonged if the current active power is larger than the frequency modulation target value, so that the requirement of the rapidity of the active power adjustment required by frequency modulation cannot be met.
In order to overcome the defects of the prior art, the invention provides a method for controlling primary frequency modulation power of a wind generating set, which replaces the mode that only the only active power change rate is limited in the prior art, so that the problem of rapidity of adjusting the active power to a target value caused by the requirement of primary frequency modulation is solved more specifically.
The invention also innovatively introduces the grid-connected point frequency to schedule the active power change rate limit value, so that the rotating speed and torque change rate limit value decomposed by the scheduled active power change rate limit value is used as the output limit of the variable pitch and torque controller, the variable pitch and torque controller controls the variable pitch and torque according to the scheduled active power change rate limit value, and the problem of rapidity of the active power regulation of the generator brought by the requirement of primary frequency modulation is responded more quickly.
Disclosure of Invention
The invention provides a method for controlling primary frequency modulation power of a wind generating set, so as to meet the requirement of rapidity of active power regulation of a generator brought by frequency modulation requirements and the requirement of a primary frequency modulation function on response time of the wind generating set.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for controlling primary frequency modulation power of a wind generating set comprises the following steps:
and detecting the frequency f of the grid-connected point in the current detection period, and acquiring a frequency dead zone setting f _ dead. If the magnitude of the change in the cross-over point frequency f does not exceed the dead zone setting, the logic ends. And if the variation amplitude of the grid-connected point frequency f exceeds the dead zone set value, calculating the frequency modulation active power deltaP. And acquiring an active power instruction P _ now at the current moment, and adding the active power instruction P _ now and the calculated frequency modulation active power deltaP to obtain a total frequency modulation active power instruction P _ sum. And decomposing the total frequency modulation active power command P _ sum to obtain a generator torque target value torque _ pfc and a generator rotating speed target value omega _ pfc.
And according to the frequency f of the grid-connected point detected in the current detection period, judging whether f is in the range of 49.5Hz and 49.75Hz, if so, searching for a corresponding power-up rate limit value deltaPlimit1 by a table look-up method, if not, continuously judging whether f is in the range of 49.75Hz and 50.05Hz, if so, searching for a corresponding power-up rate limit value deltaPlimit2 by the table look-up method, if not, continuously judging whether f is in the range of 50.05Hz and 50.25Hz, if so, searching for a corresponding power-down rate limit value deltaPlimit3 by the table look-up method, if not, continuously judging whether f is in the range of 50.25Hz and 50.5Hz, if so, searching for a corresponding power-down rate limit value deltaPlimit4 by the table look-up method, and if not, ending the logic.
If the calculated delta plimit1, the delta power rate limit is resolved into a generator speed rate of change limit deltaomega1 and a generator torque rate of change limit deltatorque 1. And the two limits are used as the maximum values of the change rate of the generator speed and the change rate of the generator torque during the process that the current generator speed omega _ now changes to the target value omega _ pfc and the current generator torque _ now changes to the target value torque _ pfc to limit the two limits.
If the calculated delta plimit2, the delta power rate limit is resolved into a generator speed rate of change limit deltaomega2 and a generator torque rate of change limit deltatorque 2. And the two limits are used as the maximum values of the change rate of the generator speed and the change rate of the generator torque during the process that the current generator speed omega _ now changes to the target value omega _ pfc and the current generator torque _ now changes to the target value torque _ pfc to limit the two limits.
If the calculated derating rate limit deltaPlimit3 is determined, the derating rate limit is resolved into a generator speed change rate limit deltaomega3 and a generator torque change rate limit deltatorque 3. And the two limits are used as the maximum values of the change rate of the generator speed and the change rate of the generator torque during the process that the current generator speed omega _ now changes to the target value omega _ pfc and the current generator torque _ now changes to the target value torque _ pfc to limit the two limits.
If the calculated derating rate limit deltaPlimit4 is determined, the derating rate limit is resolved into a generator speed change rate limit deltaomega4 and a generator torque change rate limit deltatorque 4. And the two limits are used as the maximum values of the change rate of the generator speed and the change rate of the generator torque during the process that the current generator speed omega _ now changes to the target value omega _ pfc and the current generator torque _ now changes to the target value torque _ pfc to limit the two limits.
Preferably, the invention adopts the process of detecting the grid-connected point frequency, correspondingly calculating the ascending and descending active power change rate limit value, further decomposing the ascending and descending active power change rate limit value into the generator rotating speed and torque change rate limit value, and limiting the change of the generator rotating speed and torque from the current rotating speed and torque to the target value by the limit value.
Preferably, the invention schedules the active power change rate limit value corresponding to the grid-connected point frequency change range.
Preferably, the invention adopts a mode of detecting the frequency variation of the grid-connected point; other methods, such as a manner of detecting and calculating a rate of change of the point-of-connection frequency, etc., may also be used.
Preferably, the invention searches the mode of the active power change rate limit value of the generator in a table look-up mode; other methods may also be used, such as real-time calculation of active power rate of change limits using a formula, etc.
Preferably, the generator torque measurement adopted by the invention does not use a raw signal, and the raw signal needs to be subjected to low-pass filtering processing.
Preferably, the method for measuring the grid-connected point frequency calculates the active power change rate limit value by judging the grid-connected point frequency in a 4-segment range; other methods may be used, such as more finer frequency ranges for more active power rate of change limits, etc.
Preferably, the invention adopts a mode of measuring the frequency by a single machine; other methods, such as frequency detection of the whole wind farm grid-connected point, calculation of the whole farm frequency modulation active power value and distribution to each unit by a distribution algorithm to execute the active power value, may also be used.
Preferably, the method for measuring the rotating speed of the generator does not use an original signal, and the original signal needs to be subjected to low-pass filtering processing.
The invention has the advantages that:
and calculating the frequency modulation active power by detecting the frequency variation of the grid-connected point, adding the frequency modulation active power and the current active power, and calculating the corresponding target value of the rotating speed and the torque of the generator. Meanwhile, the limit value of the active power change rate of the generator is scheduled in the range of the grid connection point frequency change and is correspondingly decomposed into the limit value of the rotation speed change rate of the generator and the limit value of the torque change rate of the generator. The two limits limit the rate of change of the current generator speed/torque to the desired frequency modulated value.
The invention schedules different active power change rate limit values in different frequency change ranges and influences the rotating speed and torque change rate limit values of the generator. By the method, the requirement on rapidity of active power regulation of the generator caused by frequency modulation requirements can be effectively improved, and the requirement of a primary frequency modulation function on the response time of the wind generating set is met.
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The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic diagram of a method for primary frequency modulation power control of a wind turbine generator system.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The following detailed description is exemplary in nature and is intended to provide further details of the invention. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention.
With reference to fig. 1, the following will describe the method for controlling the primary frequency modulation power of a wind turbine generator system according to the present invention in detail:
and detecting the frequency f of the current grid-connected point, and transmitting a measurement signal to the master control PLC. And acquiring a grid-connected point frequency dead zone setting f _ dead. It is determined whether the frequency change is greater than a dead band setting. If the frequency change is less than the deadband setting, the logic ends. And if the frequency variation is smaller than the dead zone set value, calculating the frequency modulation active power deltaP. And detecting the active power instruction P _ now at the current moment. And accumulating the frequency modulation active power deltaP in the step 5 to the active power instruction P _ now at the current moment to obtain a total frequency modulation active power instruction P _ sum. And decomposing the total frequency modulation active power command P _ sum to obtain a generator torque target value torque _ pfc and a generator rotating speed target value omega _ pfc. And judging whether the frequency f of the current grid-connected point is in the frequency ranges of 49.5Hz and 49.75Hz, if so, searching a corresponding delta power rate limit value deltaPIimit 1 through a table look-up method. If not, whether the current grid-connected point frequency f is within the frequency ranges of 49.75Hz and 50.05Hz is continuously judged, if so, the corresponding boost rate limit value deltaPIimit 2 is searched through a table look-up method. If not, whether the current grid-connected point frequency f is in the frequency ranges of 50.05Hz and 50.25Hz is continuously judged, if so, the corresponding power reduction rate limit value deltaPIimit 3 is searched through a table look-up method. If not, judging whether the current grid-connected point frequency f is within the frequency ranges of 50.25Hz and 50.5Hz, and if so, searching a corresponding power reduction rate limit value deltaPlimit4 through a table look-up method. If not, the logic ends.
The generator speed omega _ now at the present time is detected. The generator torque _ now at the present time is detected. If the calculated delta plimit1, the delta power rate limit is resolved into a generator speed rate of change limit deltaomega1 and a generator torque rate of change limit deltatorque 1. And the two limits are used as the maximum values of the change rate of the generator speed and the change rate of the generator torque during the process that the current generator speed omega _ now changes to the target value omega _ pfc and the current generator torque _ now changes to the target value torque _ pfc to limit the two limits.
If the calculated delta plimit2, the delta power rate limit is resolved into a generator speed rate of change limit deltaomega2 and a generator torque rate of change limit deltatorque 2. And the two limits are used as the maximum values of the change rate of the generator speed and the change rate of the generator torque during the process that the current generator speed omega _ now changes to the target value omega _ pfc and the current generator torque _ now changes to the target value torque _ pfc to limit the two limits.
If the calculated derating rate limit deltaPlimit3 is determined, the derating rate limit is resolved into a generator speed change rate limit deltaomega3 and a generator torque change rate limit deltatorque 3. And the two limits are used as the maximum values of the change rate of the generator speed and the change rate of the generator torque during the process that the current generator speed omega _ now changes to the target value omega _ pfc and the current generator torque _ now changes to the target value torque _ pfc to limit the two limits.
If the calculated derating rate limit deltaPlimit4 is determined, the derating rate limit is resolved into a generator speed change rate limit deltaomega4 and a generator torque change rate limit deltatorque 4. And the two limits are used as the maximum values of the change rate of the generator speed and the change rate of the generator torque during the process that the current generator speed omega _ now changes to the target value omega _ pfc and the current generator torque _ now changes to the target value torque _ pfc to limit the two limits.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (8)
1. A method for controlling primary frequency modulation power of a wind generating set is characterized by comprising the following steps:
detecting the frequency f of a grid-connected point in the current detection period, and acquiring a frequency dead zone set value f _ dead; if the change amplitude of the frequency f of the grid-connected point does not exceed the frequency dead zone set value f _ dead, the logic is ended; if the variation amplitude of the frequency f of the grid-connected point exceeds a frequency dead zone set value f _ dead, calculating to obtain the frequency modulation active power deltaP; taking the active power instruction P _ now at the current moment, and adding the active power instruction P _ now with the calculated frequency modulation active power deltaP to obtain a total frequency modulation active power instruction P _ sum; decomposing the total frequency modulation active power command P _ sum to obtain a generator torque target value torque _ pfc and a generator rotating speed target value omega _ pfc;
and judging whether f is in a first interval according to the frequency f of the grid-connected point detected in the current detection period, if so, searching a corresponding boost power rate limit value deltaPlimit1 by a table look-up method, if not, continuously judging whether f is in a second interval, if so, searching a corresponding boost power rate limit value deltaPlimit2 by the table look-up method, otherwise, continuously judging whether f is in a third interval, if so, searching a corresponding reduced power rate limit value deltaPlimit3 by the table look-up method, if not, continuously judging whether f is in a fourth interval, if so, searching a corresponding reduced power rate limit value deltaPlimit4 by the table look-up method, and if not, ending the logic.
2. Method for wind park primary frequency modulation power control according to claim 1,
if the calculated delta plimit1, the delta plimit1 is decomposed into a generator speed change rate limit deltaomega1 and a generator torque change rate limit deltatorque 1; and the generator speed change rate limit deltaomega1 and the generator torque change rate limit deltatorque1 are used as the maximum values of the generator speed change rate and the generator torque change rate when the current generator speed omega _ now changes to the generator speed target value omega _ pfc and the current generator torque _ now changes to the generator torque target value torquejpfc to limit the maximum values of the generator speed change rate and the generator torque change rate.
3. Method for wind park primary frequency modulation power control according to claim 1,
if the calculated delta plimit2, the delta plimit2 is decomposed into a generator speed change rate limit deltaomega2 and a generator torque change rate limit deltatorque 2; and the generator speed change rate limit deltaomega2 and the generator torque change rate limit deltatorque2 are used as the maximum values of the generator speed change rate and the generator torque change rate when the current generator speed omega _ now changes to the generator speed target value omega _ pfc and the current generator torque _ now changes to the generator torque target value torquejpfc to limit the maximum values of the generator speed change rate and the generator torque change rate.
4. Method for wind park primary frequency modulation power control according to claim 1,
if the calculated derating rate limit value deltaPlimit3, decomposing the derating rate limit value deltaPlimit3 into a generator speed change rate limit deltaomega3 and a generator torque change rate limit deltatorque 3; and the generator speed change rate limit deltaomega3 and the generator torque change rate limit deltatorque3 are used as the maximum values of the generator speed change rate and the generator torque change rate when the current generator speed omega _ now changes to the generator speed target value omega _ pfc and the current generator torque _ now changes to the generator torque target value torquejpfc to limit the maximum values of the generator speed change rate and the generator torque change rate.
5. Method for wind park primary frequency modulation power control according to claim 1,
if the calculated derating rate limit value deltaPlimit4, decomposing the derating rate limit value deltaPlimit4 into a generator speed change rate limit deltaomega4 and a generator torque change rate limit deltatorque 4; and the generator speed change rate limit deltaomega4 and the generator torque change rate limit deltatorque4 are used as the maximum values of the generator speed change rate and the generator torque change rate when the current generator speed omega _ now changes to the generator speed target value omega _ pfc and the current generator torque _ now changes to the generator torque target value torquejpfc to limit the maximum values of the generator speed change rate and the generator torque change rate.
6. The method of claim 1, wherein the first interval is 49.5Hz < f < 49.75Hz, the second interval is 49.75Hz < f < 50.05Hz, the third interval is 50.05Hz < f < 50.25Hz, and the fourth interval is 50.25Hz < f < 50.5 Hz.
7. The method as claimed in claim 1, wherein the current generator torque _ now is a low-pass filtered generator torque.
8. The method as claimed in claim 1, wherein the current generator speed omega _ now is the generator speed after low pass filtering.
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| CN114512993A (en) * | 2022-02-11 | 2022-05-17 | 中国华能集团清洁能源技术研究院有限公司 | Wind turbine primary frequency modulation control method, device, equipment and storage medium |
| CN115189366A (en) * | 2022-06-14 | 2022-10-14 | 中国华能集团清洁能源技术研究院有限公司 | Method and device for controlling primary frequency modulation of wind generating set |
| CN115492717A (en) * | 2022-08-22 | 2022-12-20 | 明阳智慧能源集团股份公司 | Method, system, medium and equipment for realizing primary frequency regulation of wind power generating set |
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