CN110365028B - Method for judging influence of primary frequency modulation on power oscillation - Google Patents
Method for judging influence of primary frequency modulation on power oscillation Download PDFInfo
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- CN110365028B CN110365028B CN201910578103.9A CN201910578103A CN110365028B CN 110365028 B CN110365028 B CN 110365028B CN 201910578103 A CN201910578103 A CN 201910578103A CN 110365028 B CN110365028 B CN 110365028B
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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
Abstract
The invention relates to a method for judging power oscillation influenced by primary frequency modulation, which is characterized by collecting accurate signals of the rotating speed/frequency, a speed regulator instruction and power of a generator, then calculating the maximum value, the minimum value and a deviation value in a first period, and then calculating the maximum value, the minimum value and the deviation value in a second period. And meanwhile, whether power oscillation caused by primary frequency modulation occurs is obtained by judging deviation values and the like in two periods. The method can judge whether the primary frequency modulation causes power oscillation on line in real time, further prompt relevant problems of operating personnel and take measures in time.
Description
Technical Field
The invention relates to the field of power plant electricity, in particular to a method for judging power oscillation influenced by primary frequency modulation.
Background
Because the power grid has a stricter check on the primary frequency modulation of the generator set, the power plant tends to set the primary frequency modulation parameter to be larger so as to meet the performance check requirement. However, larger parameters may also cause instability of primary frequency modulation under certain conditions, which may cause grid oscillation.
The prior art scheme mainly focuses on reducing the negative damping which may be provided by primary frequency modulation, and cannot judge whether the unit oscillation is caused by the primary frequency modulation function in real time on line.
Disclosure of Invention
In view of the above, the present invention provides a method for determining influence of primary frequency modulation on power oscillation, which can determine whether the primary frequency modulation causes the power oscillation on line in real time, so as to prompt an operator about a problem and take a measure in time.
The invention is realized by adopting the following scheme: a method for judging influence of primary frequency modulation on power oscillation specifically comprises the following steps:
step S1: collecting accurate signals of the frequency, the speed regulator instruction and the power of the generator;
step S2: respectively adopting rated values of frequency, speed regulator instructions and power as base values, and converting the signals into per unit values;
step S3: for frequency, governor command in the first time periodAnd analyzing the maximum and minimum values of the per unit value of the power, and storing the maximum and minimum values of the frequency in the storage
Corresponding time is stored in
The maximum and minimum speed regulator commands are stored in
Corresponding time is stored in
The maximum and minimum values of power are stored in
Corresponding time is stored in
Step S4: calculating deviation values of frequency, governor command, and power in a first time period, respectively
Step S5: the deviation values of the frequency, the speed regulator instruction and the power in the second time period are calculated in the same way to obtain delta F2、ΔG2、ΔP2；
Step S6: if the three signals of frequency, governor command and power are in two time periods, any one signal is delta F1And Δ F2、ΔG1And Δ G2、ΔP1And Δ P2If the deviation values of the two times are larger than the corresponding preset threshold values, prompting that the machine set is likely to oscillate to the operating personnel, starting subsequent judgment, and entering step S7; otherwise, returning to the step S3;
step S7: judging whether the requirements are met
If the two items are satisfied, the power oscillation caused by the primary frequency modulation is judged.
Further, step S1 includes performing filtering processing on the acquired signal to ensure data quality and signal-to-noise ratio.
Further, the frequency can be replaced by a rotational speed.
Further, the first time period and the second time period are both 3 s.
Compared with the prior art, the invention has the following beneficial effects: the method can judge whether the primary frequency modulation causes power oscillation on line in real time, further prompt relevant problems of operating personnel and take measures in time. Meanwhile, the method is simple and can be applied by combining with DCS equipment of a power plant.
Drawings
Fig. 1 is a schematic workflow diagram of an embodiment of the present invention.
Fig. 2 shows the operation of the unit in the embodiment of the present invention when oscillation does not occur.
Fig. 3 illustrates the operation of the present embodiment when the unit oscillates.
Detailed Description
The invention is further explained below with reference to the drawings and the embodiments.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. 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 application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As shown in fig. 1, the present embodiment provides a method for determining power oscillation affected by primary frequency modulation, which specifically includes the following steps:
step S1: collecting accurate signals of the frequency, the speed regulator instruction and the power of the generator;
step S2: respectively adopting rated values of frequency, speed regulator instructions and power as base values, and converting the signals into per unit values;
step S3: analyzing the maximum and minimum values of the frequency, the governor command and the per unit value of the power in the first time period, and storing the maximum and minimum values of the frequency in
Corresponding time is stored in
The maximum and minimum speed regulator commands are stored in
Corresponding time is stored in
The maximum and minimum values of power are stored in
Corresponding time is stored in
Step S4: calculating deviation values of frequency, governor command, and power in a first time period, respectively
Step S5: the deviation values of the frequency, the speed regulator instruction and the power in the second time period are calculated in the same way to obtain delta F2、ΔG2、ΔP2；
Step S6: if the three signals of frequency, governor command and power are in two time periods, any one signal is delta F1And Δ F2、ΔG1And Δ G2、ΔP1And Δ P2If the deviation values of the two times are larger than the corresponding preset threshold values, prompting that the machine set is likely to oscillate to the operating personnel, starting subsequent judgment, and entering step S7; otherwise, returning to the step S3;
step S7: judging whether the requirements are met
If the two items are satisfied, the power oscillation caused by the primary frequency modulation is judged.
In this embodiment, step S1 further includes performing filtering processing on the acquired signal to ensure data quality and signal-to-noise ratio.
In this embodiment, the frequency can be replaced by a rotational speed.
In this embodiment, the first time period and the second time period are both 3 s.
In this embodiment, when no oscillation occurs, the determination flow always loops to determine the frequency, governor command, and power every 3s, as shown in fig. 2. When oscillation occurs, the power and frequency change rate exceeds a threshold value, the method judges the sequence of the maximum and minimum values of the power and the frequency, and if the maximum and minimum values of the power are respectively later than the maximum and minimum values of the frequency, the method judges that the unit oscillation is caused by primary frequency modulation.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application 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 application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. 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.
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (4)
1. A method for judging the influence of primary frequency modulation on power oscillation is characterized by comprising the following steps:
step S1: collecting accurate signals of the frequency, the speed regulator instruction and the power of the generator;
step S2: respectively adopting rated values of the frequency, the speed regulator instruction and the power as basic values, and converting the rated values of the frequency, the speed regulator instruction and the power into per unit values;
step S3: analyzing the maximum and minimum values of the per unit values of the frequency, the speed regulator instruction and the power in the first time period, and storing the maximum and minimum values of the frequency in
Corresponding time is stored in
The maximum and minimum speed regulator commands are stored in
Corresponding time is stored in
The maximum and minimum values of power are stored in
Corresponding time is stored in
Step S4: calculating deviation values of frequency, governor command, and power in a first time period, respectively
Step S5: for frequency, governor command and power in the second time periodThe deviation of (2) is calculated in the same manner to obtain Δ F2、ΔG2、ΔP2；
Step S6: if the three signals of frequency, governor command and power are in two time periods, any one signal is delta F1And Δ F2、ΔG1And Δ G2、ΔP1And Δ P2If the deviation values of the two times are larger than the corresponding preset threshold values, prompting that the machine set is likely to oscillate to the operating personnel, starting subsequent judgment, and entering step S7; otherwise, returning to the step S3;
step S7: judging whether the requirements are met
If the two items are satisfied, the power oscillation caused by the primary frequency modulation is judged.
2. The method according to claim 1, wherein step S1 further includes filtering the collected signals to ensure data quality and signal-to-noise ratio.
3. A method of determining primary frequency modulation-affected power oscillations according to claim 1, characterized in that, said frequency can be replaced by rotational speed.
4. A method as claimed in claim 1, wherein the first time period and the second time period are both 3 s.
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| CN112751347B (en) * | 2020-12-30 | 2023-05-09 | 国网河北省电力有限公司电力科学研究院 | Low-frequency oscillation control method and device participated in turbine regulating system |
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| CN105281358A (en) * | 2014-05-30 | 2016-01-27 | 清华大学 | Wind power limit grid-connected capacity calculating method under constraint of frequency modulation and peak-load regulation adequacy |
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