CN113489000B - Method for restraining low-frequency oscillation of water-light complementary energy base - Google Patents
Method for restraining low-frequency oscillation of water-light complementary energy base Download PDFInfo
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- 230000000452 restraining effect Effects 0.000 title description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000010183 spectrum analysis Methods 0.000 claims abstract description 11
- 238000001914 filtration Methods 0.000 claims abstract description 10
- 238000013016 damping Methods 0.000 claims abstract description 6
- 239000003381 stabilizer Substances 0.000 claims abstract description 6
- 230000011218 segmentation Effects 0.000 claims abstract description 4
- 238000012545 processing Methods 0.000 claims description 5
- 238000012546 transfer Methods 0.000 claims description 3
- 238000010248 power generation Methods 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 6
- 230000002401 inhibitory effect Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 10
- 230000005540 biological transmission Effects 0.000 description 5
- 230000001629 suppression Effects 0.000 description 5
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Classifications
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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
- H02J3/002—Flicker reduction, e.g. compensation of flicker introduced by non-linear load
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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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S10/00—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power
- H02S10/10—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power including a supplementary source of electric power, e.g. hybrid diesel-PV energy systems
-
- 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
-
- 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
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
-
- 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
- H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
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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
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The invention relates to the technical field of water-light complementary energy base power systems, in particular to a method for inhibiting low-frequency oscillation of a water-light complementary energy base, which comprises the following steps: acquiring power P (t) of a connecting line in a base sending system; the obtained power P (t) is subjected to low-pass filtering treatment to obtain intermediate quantityThe window function w (t- τ) is introduced 0 ) For a pair ofPerforming spectrum analysis by using short-time Fourier transform in a segmentation way; selecting the intermediate frequency f to classify the spectrum-analyzed signal S (ω, t), and dividing the high-frequency signal portion S therein H Is input into an additional damping controller of the photovoltaic power station, and a low-frequency signal part S L And inputting the power into a stabilizer of the power system at the speed regulator side of the water turbine. According to the invention, the output power rapid adjustment capability of the photovoltaic power generation is utilized to participate in rapid low-frequency oscillation adjustment, the hydroelectric generating set is used for participating in slow low-frequency oscillation adjustment, and the two components cooperate to eliminate the influence of the water hammer effect on the power system, so that the stability of the water-light complementary power system is effectively enhanced.
Description
Technical Field
The invention relates to the technical field of water-light complementary energy base power systems, in particular to a method for inhibiting low-frequency oscillation of a water-light complementary energy base.
Background
The multi-energy complementation is a main direction of energy transformation development, and the water-light complementation power generation mainly utilizes the existing transmission line of a hydropower station and the quick adjustment capability of a hydroelectric generating set to combine and bundle the power of the photovoltaic power generation and the hydroelectric generating set for transmission, so that the utilization rate of a line channel can be improved, and the fluctuation influence of the photovoltaic power generation can be reduced; the popularization of the water-light complementary power generation has important significance for promoting the high-quality development of renewable energy sources, improving the operation efficiency of an electric power system and promoting the green low-carbon transformation of the energy sources;
in the related art, due to the existence of a water hammer effect, when the proportion of a hydroelectric unit in a hydroelectric power generation system is high, ultralow frequency oscillation is caused, and for the ultralow frequency oscillation generated by the hydroelectric power generation system, an electric power system stabilizer arranged on the speed regulation side of a water turbine is mostly adopted to inhibit the ultralow frequency; in the power system in the photovoltaic power generation, an additional damping controller is mostly adopted to participate in inhibiting low-frequency oscillation in the photovoltaic power generation system; however, for the water-light complementary energy base, as the power generation form of the water-light complementary energy base consists of both water power and photovoltaic, the combined action of two low-frequency oscillation inhibition methods has not been studied at present.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is known to a person skilled in the art.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the method for suppressing the low-frequency oscillation of the water-light complementary energy base is provided, and the suppression of the low-frequency oscillation in the water-light complementary energy base is realized.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
in a first aspect, the present disclosure provides a method for suppressing low-frequency oscillation of a water-light complementary energy source base, including the steps of:
acquiring power P (t) of a connecting line in a base sending system;
the obtained power P (t) is subjected to low-pass filtering treatment to obtain intermediate quantity
The window function w (t- τ) is introduced 0 ) For a pair ofPerforming spectrum analysis by using short-time Fourier transform in a segmentation way;
selecting the intermediate frequency f to classify the spectrum-analyzed signal S (ω, t), and dividing the high-frequency signal portion S therein H Is input into an additional damping controller of the photovoltaic power station, and a low-frequency signal part S L And inputting the power into a stabilizer of the power system at the speed regulator side of the water turbine.
Further, in the step of acquiring the power P (t) of the link line in the base station transmission system, the power signal P (t) of the link line transmitted by the energy base station measured by the wide area measurement device is selected as a feedback signal of the present low frequency oscillation method.
Further, in the low-pass filtering processing step of the acquired power P (t), the transfer function G of the low-pass filter is:
wherein s is complex variable, K is low-pass filter gain, w 0 Is the cut-off frequency.
Further, when the low-pass filter processing is performed, the gain of the low-pass filter is 1, and the cut-off frequency is 1.1 times the upper limit of the low-frequency oscillation.
Further, in introducing the window function w (t- τ 0 ) For a pair ofWhen the short-time Fourier transform is used for carrying out spectrum analysis in a segmented way, the adopted spectrum analysis function s is as follows:
wherein ω is frequency, t is time, τ 0 Is the window width.
Further, the window function w (t- τ) is used in performing a short-term fourier transform 0 ) In (1) selecting τ 0 The period corresponding to the upper limit of the low-frequency oscillation frequency is 0.4s.
Further, when the step of selecting the intermediate frequency f classifies the spectrum-analyzed signal S (ω, t), S H ,S L The selection mode of (a) is as follows:
wherein f i ,f j Are all of opposite powerThe frequency of the sinusoidal function contained in the function s (ω, t) obtained by the spectral analysis is performed.
Further, the intermediate frequency f is 0.5Hz.
The beneficial effects of the invention are as follows: according to the invention, the output power rapid adjustment capability of the photovoltaic power generation is utilized to participate in rapid low-frequency oscillation adjustment, the hydroelectric generating set is used to participate in slow low-frequency oscillation adjustment, the two cooperate to eliminate the influence of the water hammer effect on the power system, a method is provided for restraining low-frequency oscillation by the coordination of multiple energy sources of the new energy source base, and the stability of the water-light complementary power system is effectively enhanced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings may be obtained according to the drawings without inventive effort to those skilled in the art.
FIG. 1 is a schematic diagram of a method for suppressing the low frequency of a water-light complementary energy base in an embodiment of the invention;
FIG. 2 is a diagram showing power fluctuation of a link in a base station transmission system according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of a method for suppressing low-frequency oscillation of a water-light complementary energy base according to an embodiment of the present invention;
FIG. 4 is a graph of an intermediate amount of power signal after low pass filtering in an embodiment of the present invention;
FIG. 5 is a graph of a power signal spectrum after STFT decomposition according to an embodiment of the present invention;
FIG. 6 is S in an embodiment of the invention H Is a signal diagram of (2);
FIG. 7 is a diagram of S in an embodiment of the invention L Is a signal diagram of (2);
FIG. 8 is a graph showing the comparison of output power before and after low-frequency oscillation suppression of a photovoltaic power plant in an embodiment of the present invention;
FIG. 9 is a graph showing the comparison of output power before and after low frequency oscillation suppression of a water motor set according to an embodiment of the present invention;
fig. 10 is a graph showing a comparison of power fluctuation of a link before and after low frequency oscillation suppression in a base station transmission system according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
In the embodiment of the invention, as shown in fig. 1, the energy base comprises a water-turbine generator set and a photovoltaic generator set, the water-turbine generator set and the photovoltaic generator set jointly send out electric energy through a connecting wire, the power at a position of 110km on the connecting wire is 200MW, a three-phase grounding short-circuit fault occurs after the system stably operates for 5s, the fault is removed after 0.5s, the power on the connecting wire generates low-frequency oscillation, and at the moment, the power on the connecting wire is shown in a power wave fig. 2;
the method for suppressing the low-frequency oscillation of the water-light complementary energy source base as shown in fig. 3 comprises the following steps:
s10: acquiring power P (t) of a connecting line in a base sending system; as shown in fig. 1, the link power P (t) can be taken as an input signal by being led out on the link; and when the power signal P (t) of the power source base sent out the connecting line measured by the wide area measuring device is specifically obtained, the power signal P (t) is selected as a feedback signal of the low-frequency oscillation method.
S20: the obtained power P (t) is subjected to low-pass filtering treatment to obtain intermediate quantityThe transfer function of the low pass filter is:
wherein K is the gain of the low-pass filter, w 0 Is the cut-off frequency; in the embodiment of the invention, the low-pass filter has the function of allowing the signals below the cut-off frequency to pass, but not allowing the signals above the cut-off frequency to pass, so that the interference of high-frequency signals is avoided;
s30: the window function w (t- τ) is introduced 0 ) For a pair ofThe short-time Fourier transform is used for carrying out frequency spectrum analysis in a segmentation way, and the adopted frequency spectrum analysis function is as follows:
it should be noted here that since fourier transform studies the relation between the whole time domain and the frequency domain, it is impossible to measure and calculate an infinitely long signal when processing the signal, so that only one time segment can be cut out from the signal, and then the cut-out signal segment is used for the period extension processing, and the window function is used for cutting out a signal with limited time domain.
S40: selecting the intermediate frequency f to classify the spectrum-analyzed signal S (ω, t), and dividing the high-frequency signal portion S therein H Is input into an additional damping controller of the photovoltaic power station, and a low-frequency signal part S L Inputting into a stabilizer of a power system at the side of a speed regulator of the water turbine, S H ,S L The selection mode of (a) is as follows:
wherein f i ,f j E S (ω, t). It should be noted here that the intermediate frequency f refers to an intermediate frequency value at which the spectral analysis is performed in the truncated time.
In the embodiment, the output power rapid adjustment capability of the photovoltaic power generation is utilized to participate in rapid low-frequency oscillation adjustment, the hydroelectric generating set is used for participating in slow low-frequency oscillation adjustment, the two cooperate to eliminate the influence of the water hammer effect on the power system, a method is provided for restraining the low-frequency oscillation of multiple energy coordination effects of the new energy base, and the stability of the water-light complementary power system is effectively enhanced.
On the basis of the above embodiment, in order to avoid the influence of the high frequency band in the power signal when the low-pass filtering process is performed, the low-frequency oscillation component in the power signal is reserved, the gain K of the low-pass filter is 1, and the cut-off frequency is 1.1 times of the upper limit of the low-frequency oscillation, so that a certain margin is reserved. By reasonably setting the gain value of the low-pass filter and setting the margin of the oscillation upper limit, the power signal diagram after low-pass filtering as shown in fig. 4 is obtained, and the accuracy of the obtained intermediate quantity can be ensured, so that the accuracy of low-frequency oscillation suppression is improved.
As shown in the power signal spectrum diagram of fig. 5, it should be noted here that STFT in the diagram is a short-term fourier transform in short-term fourier transform, taking into account the frequency range of the low-frequency oscillation, window function w (t- τ 0 ) In (1) selecting τ 0 The period corresponding to the upper limit of the low-frequency oscillation frequency is 0.4s, and then the direct current component is filtered; with this arrangement, the spectrograms can be more easily distinguished.
Because the power electronic equipment in the photovoltaic power station can rapidly adjust the output power, and the hydraulic turbine set is driven by the guide vane by the hydraulic device, a certain delay exists from the command sent by the speed regulator to the guide vane action in place, and the common time is 2s; therefore, in order to avoid that the speed regulator frequently sends out an action command, which causes further deterioration of the influence of the water hammer effect on the output power of the hydroelectric generating set, in the embodiment of the invention, the intermediate frequency f is selected to be 0.5Hz, the spectrum signals are classified as shown in fig. 6 and 7, the obtained signals are stable, the signals are input into the corresponding additional damping controllers of the photovoltaic power station and the power system stabilizer (GPSS) on the speed regulator side of the water turbine, and the power diagrams on the final photovoltaic power station, the water turbine set and the connecting line are shown as fig. 8 to 10, so that the inhibiting effect on the low-frequency oscillation after adjustment in the diagrams is obvious, and the stability of the system is enhanced.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. The method for suppressing the low-frequency oscillation of the water-light complementary energy source base is characterized by comprising the following steps of:
acquiring power P (t) of a connecting line in a base sending system;
the obtained power P (t) is subjected to low-pass filtering treatment to obtain intermediate quantity
The window function w (t- τ) is introduced 0 ) For a pair ofPerforming spectrum analysis by using short-time Fourier transform in a segmentation way;
selecting the intermediate frequency f to classify the spectrum-analyzed signal S (ω, t), and dividing the high-frequency signal portion S therein H Is input into an additional damping controller of the photovoltaic power station, and a low-frequency signal part S L Inputting the power system stabilizer at the side of the speed regulator of the water turbine;
in the step of acquiring the power P (t) of the connecting line in the base sending-out system, which is measured by a wide area measuring device, is selected as a feedback signal of the low-frequency oscillation method;
when the step of selecting the intermediate frequency f classifies the spectrum-analyzed signal S (ω, t), S H ,S L The selection mode of (a) is as follows:
wherein f i ,f j Are all of opposite powerSinusoidal function frequencies contained in the spectrum-analyzed signal s (ω, t);
in introducing the window function w (t- τ 0 ) For a pair ofWhen the short-time Fourier transform is used for carrying out spectrum analysis in a segmented way, the adopted spectrum analysis function s is as follows:
wherein ω is frequency, t is time, τ 0 Is the window width.
2. The method of suppressing a low-frequency oscillation of a water-light complementary energy source base according to claim 1, wherein in the low-pass filtering processing step of the obtained power P (t), a transfer function G of the low-pass filter is:
wherein s is complex variable, K is low-pass filter gain, w 0 Is the cut-off frequency.
3. The method for suppressing low-frequency oscillation of a water-light complementary energy source base according to claim 2, wherein the gain of the low-pass filter is 1 and the cut-off frequency is 1.1 times the upper limit of the low-frequency oscillation when the low-pass filtering process is performed.
4. The method for suppressing low-frequency oscillation of a water-light complementary energy source base according to claim 1, wherein the window function w (t- τ 0 ) In (1) selecting τ 0 The period corresponding to the upper limit of the low-frequency oscillation frequency is 0.4s.
5. The method for suppressing a water-light complementary energy base low-frequency oscillation according to claim 4, wherein the intermediate frequency f is 0.5Hz.
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