CN115036941A - Wind power plant secondary frequency modulation signal distribution method based on adaptive filtering - Google Patents

Wind power plant secondary frequency modulation signal distribution method based on adaptive filtering Download PDF

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Publication number
CN115036941A
CN115036941A CN202210953825.XA CN202210953825A CN115036941A CN 115036941 A CN115036941 A CN 115036941A CN 202210953825 A CN202210953825 A CN 202210953825A CN 115036941 A CN115036941 A CN 115036941A
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wind
wind turbine
turbine generator
variable
power
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CN115036941B (en
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汤奕
戴剑丰
阎诚
钱俊良
周吉
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Nanjing Dongbo Intelligent Energy Research Institute Co ltd
Liyang Research Institute of Southeast University
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Nanjing Dongbo Intelligent Energy Research Institute Co ltd
Liyang Research Institute of Southeast University
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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
    • 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
    • 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
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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
    • 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 discloses a wind power plant secondary frequency modulation signal distribution method based on adaptive filtering. Firstly, collecting the operating wind speed, the pitch angle and the rotor rotating speed of a wind power generator set in a wind power plant, and uploading the operating wind speed, the pitch angle and the rotor rotating speed to a wind power plant level central controller; then, the wind farm level central controller judges the operation mode according to the pitch angle of each wind turbine generator, and the method comprises the following steps: the control mode of variable rotating speed and variable pitch calculates the power regulation capability of the variable rotating speed and variable pitch control of the wind power plant, corrects the parameters of the filtering link of the regional control deviation signal, and keeps the parameters in the current control period; and finally, frequency division is carried out on the regional control deviation signal through a filtering link, a low-frequency signal is distributed to the wind turbine generator in the variable pitch control mode, a high-frequency signal is distributed to the wind turbine generator in the variable rotating speed control mode, and the process is repeated. The invention gives consideration to the variable rotating speed and variable pitch control characteristics of the wind turbine generator, realizes the optimal distribution of the secondary frequency modulation command signals of the system, and is beneficial to improving the safe operation reliability of the new energy power system.

Description

Wind power plant secondary frequency modulation signal distribution method based on adaptive filtering
Technical Field
The invention relates to the technical field of power grid frequency stability analysis, in particular to a wind power plant secondary frequency modulation signal distribution method based on adaptive filtering.
Background
Wind power generation is a clean energy power generation technology with great potential at present, and the frequency stability of a power grid is reduced along with the increasing of the proportion of wind power generation. The characteristics of random fluctuation, intermittent output, uncertain time sequence and the like of wind power increase the frequency modulation pressure of the traditional power supply, and increase the difficulty of real-time balance of power generation and load. In the secondary frequency modulation process of the power system, the automatic power generation control aims at eliminating regional control deviation, and the power and frequency deviation of the tie line are collected to realize the non-difference adjustment of the frequency of the power system. Wind power is a high-quality secondary frequency modulation resource and has important significance on the conventional power supply frequency modulation task of the distribution system. The wind power dynamic characteristic is fast, and the automatic power generation control instruction can be quickly responded and matched with the traditional thermal power generating unit. However, frequent fluctuation changes of the wind turbine instructions cause frequent actions of the pitch angle of the mechanical part, and equipment abrasion and mechanical loss are increased.
The traditional equal-proportion and equal-margin secondary frequency modulation instruction distribution method does not consider the difference of the running states of the wind turbine generator and is insufficient in response speed and tracking precision. In the past, researches are focused on improvement of a power control strategy of a wind turbine generator, the research on distribution of secondary frequency modulation instructions of a system is relatively less, and the strategy of self-adaption participation of a wind power plant in system frequency control under various wind power frequency modulation control strategies is not clear. Therefore, how to realize reasonable distribution of secondary frequency modulation command signals of the system, reduce frequent adjustment actions of mechanical parts of the wind turbine generator and ensure fine control of each generator is a difficult problem to be solved.
The wind turbine generator can respond to the secondary frequency modulation command through the adjustment of the rotating speed and the pitch angle, the response speed of the variable rotating speed control is high, the physical significance is clear, and the method is an ideal power adjustment mode; the pitch angle control needs to adjust the pitch angle of a wind wheel of a wind turbine part, the transmission part is greatly abraded, and the wind turbine control generally only acts when the wind speed is higher than a rated value. The existing research does not relate to a secondary frequency modulation signal self-adaptive distribution issuing method.
Disclosure of Invention
In view of the above defects in the prior art, the technical problem to be solved by the present invention is to provide a method for allocating a secondary frequency modulation signal of a wind farm based on adaptive filtering, which can adaptively allocate the secondary frequency modulation signal according to the total frequency modulation capability of the wind farm, and improve the frequency stability of a power system containing high-proportion wind power.
In order to achieve the purpose, the invention provides a wind power plant secondary frequency modulation signal distribution method based on adaptive filtering, which comprises the following steps of:
step 1: collecting the operating wind speed, the pitch angle and the rotor rotating speed of each wind turbine generator in the wind power plant, and transmitting the operating wind speed, the pitch angle and the rotor rotating speed to a wind power plant level central controller;
step 2: the wind power plant level central controller judges the operation mode according to the pitch angle of each wind turbine generator, and the method comprises the following steps: the method comprises the steps of calculating the power regulation capacity of variable rotation speed and variable pitch control of a wind power plant in a variable rotation speed control mode and a variable pitch control mode, correcting the filtering link parameters of a regional control deviation signal, and keeping the parameters in the current control period;
and 3, step 3: and (3) frequency division is carried out on the regional control deviation signal through a filtering link, a low-frequency signal is distributed to the wind turbine generator set in a variable pitch control mode, a high-frequency signal is distributed to the wind turbine generator set in a variable rotating speed control mode, the steps 1 to 3 are repeated, and the signal after secondary frequency modulation is continuously distributed to each wind turbine generator set.
Further, in the step 2, the wind power plant level central controller judges the operation mode according to the pitch angle of each wind turbine generator, and when the operation mode is the firstiWhen the pitch angle of each wind turbine generator meets the following formula, the wind turbine generator is in a pitch angle control mode, otherwise, the wind turbine generator is in a variable rotation speed control mode:
Figure 403454DEST_PATH_IMAGE001
in the formula:
Figure 382911DEST_PATH_IMAGE002
is as followsiThe pitch angle of each wind turbine generator;
Figure 959386DEST_PATH_IMAGE003
the maximum value of the pitch angle allowed to be adjusted by the wind turbine.
Further, in step 2, calculating the variable rotation speed and the variable pitch control power regulation capability of the wind power plant specifically includes: the wind turbine generator set reduces the upward adjustment margin of the reserved part through power, and the power of the wind turbine generator setPThe output can be expressed as:
Figure 885754DEST_PATH_IMAGE004
in the formula:Pthe power of the wind turbine generator;
Figure 496864DEST_PATH_IMAGE005
is the air density;C p a wind energy capture efficiency coefficient;
Figure 853414DEST_PATH_IMAGE006
is tip speed ratio;
Figure 182765DEST_PATH_IMAGE007
is an intermediate variable;
Figure 912823DEST_PATH_IMAGE008
is the pitch angle;Athe area for capturing the wind energy of the blade;vis the wind speed;
Figure 112860DEST_PATH_IMAGE009
the rotating speed of the rotor of the wind turbine generator set; r is the impeller radius of the wind turbine;
Figure 637383DEST_PATH_IMAGE010
is a natural constant in mathematics;
first, theiUpper limit value for adjusting variable rotating speed power of wind power plant of wind turbine generator
Figure 188450DEST_PATH_IMAGE011
Lower limit of
Figure 456620DEST_PATH_IMAGE012
Respectively as follows:
Figure 511164DEST_PATH_IMAGE013
Figure 472166DEST_PATH_IMAGE014
in the formula:
Figure 244950DEST_PATH_IMAGE015
for the optimum value of the rotational speed of the rotor,
Figure 785653DEST_PATH_IMAGE016
the upper limit value of the rotor speed; in the formula
Figure 960283DEST_PATH_IMAGE017
Is shown asiThe wind speed of each wind turbine generator;
Figure 826607DEST_PATH_IMAGE018
denotes the firstiThe rotor speed of each wind turbine generator;
first, theiUpper limit value for adjusting variable pitch power of wind power plant of wind turbine generator
Figure 86687DEST_PATH_IMAGE019
Lower limit of
Figure 696660DEST_PATH_IMAGE020
Respectively as follows:
Figure 722866DEST_PATH_IMAGE021
Figure 760093DEST_PATH_IMAGE022
in the formula:
Figure 241890DEST_PATH_IMAGE023
and
Figure 655553DEST_PATH_IMAGE024
the optimal value and the upper limit of the pitch angle are respectively;
Figure 273616DEST_PATH_IMAGE025
representing pitch angle of ith wind turbine
The wind farm variable speed control power regulation capability can be expressed as:
Figure 747323DEST_PATH_IMAGE026
in the formula:
Figure 716416DEST_PATH_IMAGE027
adjusting a value for the variable-speed power of the wind power plant;Nthe total number of wind generating sets in the wind power plant;irepresenting the number of wind turbines of a wind farm;
the wind farm pitch control power regulation capability may be expressed as:
Figure 668192DEST_PATH_IMAGE028
in the formula:
Figure 671920DEST_PATH_IMAGE029
adjusting a value for wind power plant variable pitch power;Nthe total number of the wind generating sets in the wind power plant.
Further, in step 2, a filtering link parameter of the area control deviation signal is corrected, and the low-pass filtering link parameter is a cut-off frequency
Figure 316528DEST_PATH_IMAGE030
The method is set as follows:
Figure 772917DEST_PATH_IMAGE031
in the formula:
Figure 528383DEST_PATH_IMAGE032
is the cut-off frequency;
Figure 121039DEST_PATH_IMAGE033
is the maximum cut-off frequency;
Figure 670969DEST_PATH_IMAGE034
for controlling dead zone by changing rotation speed, avoiding
Figure 614654DEST_PATH_IMAGE035
And if the power distribution is too small, the wind turbine generator cannot participate in disturbance power distribution.
Further, in the step 3, the frequency division is performed on the regional control deviation signal through a filtering link, a low-frequency signal is distributed to the wind turbine generator set in the variable pitch control mode, a high-frequency signal is distributed to the wind turbine generator set in the variable rotation speed control mode, and the relation between the amplitude and the frequency in the filtering link
Figure 908232DEST_PATH_IMAGE036
Comprises the following steps:
Figure 620973DEST_PATH_IMAGE037
in the formula:
Figure 341804DEST_PATH_IMAGE038
representing the relation between the amplitude and the frequency in a filtering link;nis the filtering link model order;
Figure 507206DEST_PATH_IMAGE039
is a ripple wave systemCounting;
Figure 607405DEST_PATH_IMAGE040
is a chebyshev polynomial;
in the laplacian domain, the poles of the filtering element can be solved by the following formula:
Figure 440232DEST_PATH_IMAGE041
the filtering step of the area control deviation signal can be calculated by the following formula:
Figure 66385DEST_PATH_IMAGE042
in the formula:
Figure 984663DEST_PATH_IMAGE043
an expression for a region control deviation signal filtering link;
Figure 885623DEST_PATH_IMAGE044
stabilizing the corresponding pole for the control link; js denotes the imaginary part of the complex frequency domain; n represents the number of poles; s represents a complex frequency domain;
setting zone control deviation signalP ACE After being filtered, the product isP ACE,H The low-frequency signal is distributed to the wind turbine in the pitch control mode, secondiThe reference power of the wind turbine generator side converter with the platform in the variable pitch control mode is adjusted as follows:
Figure 41798DEST_PATH_IMAGE045
in the formula:P i wind turbine generator set output power before participating in secondary frequency modulation power distribution;
Figure 370011DEST_PATH_IMAGE046
active reference value for representing ith wind turbine generator set
First, theiWind turbine generator with platform in variable rotating speed control modeThe side converter reference power is adjusted as follows:
Figure 510005DEST_PATH_IMAGE047
。
the beneficial effects of the invention are:
the method can adaptively distribute the secondary frequency modulation signals according to the overall frequency modulation capability of the wind power plant, so that the overall mechanical loss of the wind power plant is reduced, and the frequency stability of a power system containing high-proportion wind power is improved. And the variable rotating speed and variable pitch control characteristics of the wind turbine generator are considered, the optimal distribution of the secondary frequency modulation command signals of the system is realized, and the safe operation reliability of the new energy power system is improved.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 is a flow chart of the implementation of the method of the present invention;
FIG. 2 is a diagram of the amplitude-frequency characteristic of the filtering element constructed by the method of the present invention;
FIG. 3 is a diagram of a secondary FM command signal for verifying the proposed method of the present invention;
fig. 4 shows the result of the secondary fm command signal distribution implemented by the method of the present invention.
Detailed Description
As shown in fig. 1, a wind farm secondary frequency modulation signal distribution method based on adaptive filtering includes the following steps:
step 1: collecting the operating wind speed, the pitch angle and the rotor rotating speed of each wind turbine generator in the wind power plant, and transmitting the operating wind speed, the pitch angle and the rotor rotating speed to a wind power plant level central controller;
and 2, step: the wind power plant level central controller judges the operation mode according to the pitch angle of each wind turbine generator, and the method comprises the following steps: the method comprises the steps of calculating the power regulation capacity of variable rotation speed and variable pitch control of a wind power plant in a variable rotation speed control mode and a variable pitch control mode, correcting the filtering link parameters of a regional control deviation signal, and keeping the parameters in the current control period;
and step 3: and (3) frequency division is carried out on the regional control deviation signal through a filtering link, a low-frequency signal is distributed to the wind turbine generator set in a variable pitch control mode, a high-frequency signal is distributed to the wind turbine generator set in a variable rotating speed control mode, the steps 1 to 3 are repeated, and the signal after secondary frequency modulation is continuously distributed to each wind turbine generator set.
In this embodiment, in step 2, the wind farm level central controller determines the operation mode according to the pitch angle of each wind turbine, and when the wind farm level central controller determines the operation mode, the wind farm level central controller determines the operation mode according to the pitch angle of each wind turbineiWhen the pitch angle of each wind turbine generator meets the following formula, the wind turbine generator is in a pitch angle control mode, otherwise, the wind turbine generator is in a variable rotation speed control mode:
Figure 214656DEST_PATH_IMAGE048
in the formula:
Figure 756496DEST_PATH_IMAGE049
is as followsiThe pitch angle of each wind turbine generator;
Figure 990031DEST_PATH_IMAGE050
the maximum value of the pitch angle allowed to be adjusted by the wind turbine.
In this embodiment, in step 2, calculating the variable rotation speed and the variable pitch control power regulation capability of the wind farm specifically includes: the wind turbine generator set outputs power through upward adjustment margin of the reserved part of power reductionPCan be expressed as:
Figure 617321DEST_PATH_IMAGE051
in the formula:Pthe power of the wind turbine generator;
Figure 860084DEST_PATH_IMAGE052
is the air density;C p a wind energy capture efficiency coefficient;
Figure 256430DEST_PATH_IMAGE053
is tip speed ratio;
Figure 926446DEST_PATH_IMAGE054
is an intermediate variable;
Figure 41032DEST_PATH_IMAGE055
is the pitch angle;Acapturing the area for the blade wind energy;vis the wind speed;
Figure 821907DEST_PATH_IMAGE056
the rotating speed of the rotor of the wind turbine generator set; r is the impeller radius of the wind turbine;
Figure 335409DEST_PATH_IMAGE010
is a natural constant in mathematics;
first, theiUpper limit value for adjusting variable rotating speed power of wind power plant of wind turbine generator
Figure 176326DEST_PATH_IMAGE057
Lower limit of
Figure 778209DEST_PATH_IMAGE058
Respectively as follows:
Figure 362774DEST_PATH_IMAGE059
in the formula:
Figure 468133DEST_PATH_IMAGE060
for the optimum value of the rotational speed of the rotor,
Figure 479951DEST_PATH_IMAGE061
the upper limit value of the rotor speed; in the formula
Figure 37972DEST_PATH_IMAGE062
Is shown asiThe wind speed of each wind turbine generator;
Figure 426228DEST_PATH_IMAGE063
is shown asiThe rotor speed of each wind turbine.
First, theiUpper limit value for adjusting variable pitch power of wind power plant of wind turbine generator
Figure 651673DEST_PATH_IMAGE064
Lower limit of
Figure 834392DEST_PATH_IMAGE065
Respectively as follows:
Figure 410867DEST_PATH_IMAGE066
in the formula:
Figure 71656DEST_PATH_IMAGE067
and
Figure 417186DEST_PATH_IMAGE068
the optimal value and the upper limit of the pitch angle are respectively;
Figure 36386DEST_PATH_IMAGE069
representing pitch angle of ith wind turbine
The wind farm variable speed control power regulation capability can be expressed as:
Figure 834578DEST_PATH_IMAGE070
in the formula:
Figure 299057DEST_PATH_IMAGE071
adjusting a value for the variable-speed power of the wind power plant;Nthe total number of wind generating sets in the wind power plant;irepresenting the number of wind turbines of a wind farm;
the wind farm pitch control power regulation capability may be expressed as:
Figure 233515DEST_PATH_IMAGE072
in the formula:
Figure 23617DEST_PATH_IMAGE073
adjusting a value for wind power plant variable pitch power;Nfor wind powerAnd the total number of wind turbines in the plant.
In this embodiment, in step 2, the filtering link parameter of the area control deviation signal is modified, and the low-pass filtering link parameter is the cut-off frequency
Figure 312034DEST_PATH_IMAGE074
The method is set as follows:
Figure 314626DEST_PATH_IMAGE075
in the formula:
Figure 369169DEST_PATH_IMAGE076
is the cut-off frequency;
Figure 330172DEST_PATH_IMAGE077
is the maximum cut-off frequency;
Figure 571797DEST_PATH_IMAGE078
for controlling dead zone by changing rotation speed, avoiding
Figure 643659DEST_PATH_IMAGE079
And if the power distribution is too small, the wind turbine generator cannot participate in disturbance power distribution.
In this embodiment, in step 3, the frequency division is performed on the regional control deviation signal through a filtering link, a low-frequency signal is distributed to the wind turbine generator set in the variable pitch control mode, a high-frequency signal is distributed to the wind turbine generator set in the variable rotation speed control mode, and a relation between an amplitude and a frequency in the filtering link
Figure 552709DEST_PATH_IMAGE080
Comprises the following steps:
Figure 419034DEST_PATH_IMAGE081
in the formula:
Figure 679114DEST_PATH_IMAGE038
representing filtering elementsMedium amplitude versus frequency;nis the filtering link model order;
Figure 289087DEST_PATH_IMAGE082
is the ripple factor;
Figure 52643DEST_PATH_IMAGE083
is a chebyshev polynomial;
in the laplacian domain, the poles of the filtering element can be solved by the following formula:
Figure 89869DEST_PATH_IMAGE084
the filtering link of the area control deviation signal can be calculated by the following formula:
Figure 837246DEST_PATH_IMAGE085
in the formula:
Figure 985330DEST_PATH_IMAGE043
an expression for a region control deviation signal filtering link;
Figure 868972DEST_PATH_IMAGE086
stabilizing the corresponding pole for the control link; js denotes the imaginary part of the complex frequency domain, n denotes the number of poles, and s denotes the complex frequency domain.
Setting zone control deviation signalP ACE After being filtered, the product isP ACE,H The low-frequency signal is distributed to the wind turbine in the pitch control mode, secondiThe reference power of the wind turbine generator side converter with the platform in the variable pitch control mode is adjusted as follows:
Figure 77100DEST_PATH_IMAGE087
in the formula:P i wind turbine generator set output power before participating in secondary frequency modulation power distribution;
Figure 46193DEST_PATH_IMAGE088
and an active reference value of the ith wind generating set is represented.
First, theiThe reference power of the wind turbine generator side converter with the platform in the variable rotating speed control mode is adjusted as follows:
Figure 997968DEST_PATH_IMAGE047
。
setting 200 wind power generation sets of 1.5MW in a wind power plant in a certain area, setting the power regulation capacity of the wind power generation sets in a variable rotating speed control mode to be 30%, and setting the maximum cut-off frequency
Figure 736117DEST_PATH_IMAGE089
Is 0.0055 Hz. Design cut-off frequency
Figure 135654DEST_PATH_IMAGE090
A low-pass filter of =0.0017Hz, and the amplitude-frequency characteristics are shown in fig. 2. The wind power plant secondary frequency modulation instruction is shown in figure 3. Fig. 4 shows the secondary frequency modulation instruction allocation result after the method is adopted, and it can be seen that after the method is adopted, the frequency modulation curve of the wind turbine generator in the pitch control mode changes more smoothly, the repeated actions of the pitch angle are reduced, and the secondary frequency modulation power with larger system fluctuation is borne by the variable-speed control unit. Table 1 shows the comparison between the variable speed control and the variable pitch control power after the proposed method is adopted, and it can be seen that the proposed method considers the unit operation difference and the variable pitch control power is greatly reduced.
Figure 592043DEST_PATH_IMAGE091
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection determined by the claims.

Claims (5)

1. A wind power plant secondary frequency modulation signal distribution method based on adaptive filtering is characterized by comprising the following steps:
step 1: collecting the operating wind speed, the pitch angle and the rotor rotating speed of each wind turbine generator in the wind power plant, and transmitting the operating wind speed, the pitch angle and the rotor rotating speed to a wind power plant level central controller;
step 2: the wind power plant level central controller judges the operation mode according to the pitch angle of each wind turbine generator, and the method comprises the following steps: the method comprises the steps of calculating the power regulation capacity of variable rotation speed and variable pitch control of a wind power plant in a variable rotation speed control mode and a variable pitch control mode, correcting the filtering link parameters of a regional control deviation signal, and keeping the parameters in the current control period;
and step 3: and (3) frequency division is carried out on the regional control deviation signal through a filtering link, a low-frequency signal is distributed to the wind turbine generator set in a variable pitch control mode, a high-frequency signal is distributed to the wind turbine generator set in a variable rotating speed control mode, the steps 1 to 3 are repeated, and the signal after secondary frequency modulation is continuously distributed to each wind turbine generator set.
2. The wind farm secondary frequency modulation signal distribution method based on the adaptive filtering as claimed in claim 1, characterized in that: in the step 2, the wind power plant level central controller judges the operation mode according to the pitch angle of each wind turbine generator, and when the operation mode is the firstiWhen the pitch angle of each wind turbine generator meets the following formula, the wind turbine generator is in a pitch angle control mode, otherwise, the wind turbine generator is in a variable rotation speed control mode:
Figure 945425DEST_PATH_IMAGE001
in the formula:
Figure 803660DEST_PATH_IMAGE002
is as followsiThe pitch angle of each wind turbine generator;
Figure 619169DEST_PATH_IMAGE003
the maximum value of the pitch angle allowed to be adjusted by the wind turbine.
3. The wind farm secondary frequency modulation signal distribution method based on the adaptive filtering as claimed in claim 2, characterized in that: in the step 2, the variable rotation speed and variable pitch control power regulation capacity of the wind power plant is calculated, and the method specifically comprises the following steps: the wind turbine generator set reduces the upward adjustment margin of the reserved part through power, and the power of the wind turbine generator setPCan be expressed as:
Figure 562854DEST_PATH_IMAGE004
in the formula:Pthe power of the wind turbine generator;
Figure 856432DEST_PATH_IMAGE005
is the air density;C p a wind energy capture efficiency coefficient;
Figure 303594DEST_PATH_IMAGE006
is the tip speed ratio;
Figure 290005DEST_PATH_IMAGE007
is an intermediate variable;
Figure 986565DEST_PATH_IMAGE008
is the pitch angle;Athe area for capturing the wind energy of the blade;vis the wind speed;
Figure 83834DEST_PATH_IMAGE009
the rotating speed of the rotor of the wind turbine generator set; r is the impeller radius of the wind turbine;
Figure 651082DEST_PATH_IMAGE010
is a natural constant in mathematics;
first, theiVariable-speed power of wind power plant of wind turbine generatorUpper limit of rate adjustment
Figure 808394DEST_PATH_IMAGE011
Lower limit of
Figure 726671DEST_PATH_IMAGE012
Respectively as follows:
Figure 382560DEST_PATH_IMAGE013
in the formula:
Figure 69893DEST_PATH_IMAGE014
for the optimum value of the rotational speed of the rotor,
Figure 398106DEST_PATH_IMAGE015
the upper limit value of the rotor speed; in the formula
Figure 538100DEST_PATH_IMAGE016
Denotes the firstiThe wind speed of each wind turbine generator;
Figure 508330DEST_PATH_IMAGE017
is shown asiThe rotor speed of each wind turbine generator;
first, theiUpper limit value for adjusting variable pitch power of wind power plant of wind turbine generator
Figure 50170DEST_PATH_IMAGE018
Lower limit of
Figure 549285DEST_PATH_IMAGE019
Respectively as follows:
Figure 176575DEST_PATH_IMAGE020
in the formula:
Figure 153758DEST_PATH_IMAGE021
and
Figure 815684DEST_PATH_IMAGE022
the optimal value and the upper limit of the pitch angle are respectively;
Figure 751279DEST_PATH_IMAGE023
representing the pitch angle of the ith wind turbine;
the wind farm variable speed control power regulation capability can be expressed as:
Figure 865865DEST_PATH_IMAGE024
in the formula:
Figure 646739DEST_PATH_IMAGE025
adjusting a value for the variable-speed power of the wind power plant;Nthe total number of wind generating sets in the wind power plant;irepresenting the number of wind turbines of a wind farm;
the wind farm pitch control power regulation capability may be expressed as:
Figure 897592DEST_PATH_IMAGE026
in the formula:
Figure 738509DEST_PATH_IMAGE027
adjusting a value for wind power plant variable pitch power;Nthe total number of the wind generating sets in the wind power plant.
4. The wind farm secondary frequency modulation signal distribution method based on the adaptive filtering as claimed in claim 3, characterized in that: in the step 2, the filtering link parameter of the area control deviation signal is corrected, and the low-pass filtering link parameter is cut-off frequency
Figure 343322DEST_PATH_IMAGE028
The method is set as follows:
Figure 927887DEST_PATH_IMAGE029
in the formula:
Figure 33246DEST_PATH_IMAGE030
is the cut-off frequency;
Figure 45064DEST_PATH_IMAGE031
is the maximum cut-off frequency;P vs0 for controlling dead zone by changing rotation speed, avoiding
Figure 868664DEST_PATH_IMAGE032
And if the power distribution is too small, the wind turbine generator cannot participate in disturbance power distribution.
5. The wind farm secondary frequency modulation signal distribution method based on the adaptive filtering as claimed in claim 4, characterized in that: in the step 3, the frequency division is carried out on the regional control deviation signal through a filtering link, a low-frequency signal is distributed to the wind turbine generator set in the variable pitch control mode, a high-frequency signal is distributed to the wind turbine generator set in the variable rotating speed control mode, and the relation between the amplitude and the frequency in the filtering link
Figure 991341DEST_PATH_IMAGE033
Comprises the following steps:
Figure 216786DEST_PATH_IMAGE034
in the formula:
Figure 399505DEST_PATH_IMAGE035
representing the relation between the amplitude and the frequency in a filtering link;nis the filtering link model order;
Figure 975980DEST_PATH_IMAGE036
is the ripple factor;
Figure 636769DEST_PATH_IMAGE037
is a chebyshev polynomial;
in the laplacian domain, the poles of the filtering element can be solved by the following formula:
Figure 716720DEST_PATH_IMAGE038
the filtering step of the area control deviation signal can be calculated by the following formula:
Figure 335920DEST_PATH_IMAGE039
in the formula:
Figure 134112DEST_PATH_IMAGE040
an expression for a region control deviation signal filtering link;
Figure 333012DEST_PATH_IMAGE041
stabilizing the corresponding pole for the control link; js denotes the imaginary part of the complex frequency domain; n represents the number of poles; s represents a complex frequency domain;
setting zone control deviation signalP ACE After being filtered, the product isP ACE,H The low-frequency signal is distributed to the wind turbine in the pitch control mode, secondiThe reference power of the wind turbine generator side converter with the platform in the variable pitch control mode is adjusted as follows:
Figure 533049DEST_PATH_IMAGE042
in the formula:P i wind turbine generator set output power before participating in secondary frequency modulation power distribution;
Figure 323151DEST_PATH_IMAGE043
representing an active reference value of the ith wind generating set;
first, theiThe reference power of the wind turbine generator side converter with the platform in the variable rotating speed control mode is adjusted as follows:
Figure 343059DEST_PATH_IMAGE044
。
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