CN112600222B - Method and system for restraining subsynchronous oscillation of new energy unit based on camera - Google Patents
Method and system for restraining subsynchronous oscillation of new energy unit based on camera Download PDFInfo
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- CN112600222B CN112600222B CN202011202543.3A CN202011202543A CN112600222B CN 112600222 B CN112600222 B CN 112600222B CN 202011202543 A CN202011202543 A CN 202011202543A CN 112600222 B CN112600222 B CN 112600222B
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- 230000010355 oscillation Effects 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000000452 restraining effect Effects 0.000 title abstract description 15
- 230000005284 excitation Effects 0.000 claims abstract description 43
- 238000013016 damping Methods 0.000 claims abstract description 28
- 230000001629 suppression Effects 0.000 claims abstract description 12
- 238000011217 control strategy Methods 0.000 claims abstract description 10
- 230000005540 biological transmission Effects 0.000 claims abstract description 9
- 230000002441 reversible effect Effects 0.000 claims abstract description 9
- 238000004804 winding Methods 0.000 claims abstract description 7
- 230000001360 synchronised effect Effects 0.000 claims description 9
- 238000007781 pre-processing Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 238000004590 computer program Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000006870 function Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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
- H02J3/24—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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
-
- 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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
- H02J2003/365—Reducing harmonics or oscillations in HVDC
-
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The application discloses a method and a system for restraining subsynchronous oscillation of a new energy unit based on a camera, and belongs to the technical field of subsynchronous oscillation. The method of the application comprises the following steps: a subsynchronous oscillation damping control link is added to an excitation system of a camera installed in the new energy enrichment area; acquiring a corresponding relation from a damping control link of an excitation system to output current of a stator side; adding a secondary synchronization frequency electric quantity adjusting link to the excitation system, and determining the transmission characteristic of secondary synchronization current/voltage between a rotor and a stator winding of the phase-change regulator; when the fact that the voltage or the current of the phase-adjusting machine end has the subsynchronous frequency band oscillation component is monitored, the phase-adjusting machine is controlled to output reverse voltage or current to the power grid according to a preset damping control strategy, and subsynchronous oscillation suppression of the new energy unit is completed. The application provides a camera for restraining subsynchronous oscillation of a new energy unit, which is expected to have better effect on economy and controllability.
Description
Technical Field
The application relates to the technical field of subsynchronous oscillation, in particular to a method and a system for restraining subsynchronous oscillation of a new energy unit based on a camera.
Background
The problem of subsynchronous oscillation can be caused by the application of a series compensation technology, a high-voltage direct current (HVDC) technology and large-scale new energy access in an electric power system, the subsynchronous oscillation gradually becomes one of the stability problems of a new energy external transmission system along with the rapid development of new energy power generation in China, the subsynchronous oscillation phenomenon can occur for many times by the current adoption of a new energy weak access system and a doubly-fed wind power integrated by an electric power electronic converter interface through an alternating current series compensation external transmission system, and the subsynchronous oscillation problem can occur by the adoption of direct-drive wind power and photovoltaic power integrated by the converter interface.
At present, research on new energy subsynchronous oscillation inhibition measures is being developed in the domestic industry, and different from the conventional turbine set fixed frequency point subsynchronous oscillation, the new energy subsynchronous oscillation frequency may drift in a wider frequency band and present the characteristic of broadband oscillation, so that the damping control strategy of the fixed parameter subsynchronous oscillation of the turbine set may not achieve the aim of improving damping, and the research on the stabilizing mechanism, analysis method and solving measure of accessing the diversified power electronic equipment into a more complex power system is obviously delayed from the process of power electronic of the power system.
Disclosure of Invention
Aiming at the problems, the application discloses a method for restraining subsynchronous oscillation of a new energy unit based on a camera, which comprises the following steps:
a subsynchronous oscillation damping control link is added to an excitation system of a camera installed in the new energy enrichment area;
acquiring a corresponding relation from a damping control link of an excitation system to output current of a stator side;
adding a secondary synchronization frequency electric quantity adjusting link to the excitation system, and determining the transmission characteristic of secondary synchronization current/voltage between a rotor and a stator winding of the phase-change regulator;
when the fact that the voltage or the current of the phase-adjusting machine end has a subsynchronous frequency band oscillation component is monitored, controlling the phase-adjusting machine to output reverse voltage or current to a power grid according to a preset damping control strategy, and completing subsynchronous oscillation suppression of the new energy unit;
under the reactive condition of a camera, the relation among reactive power, electromotive force and excitation system voltage input by the excitation system is as follows:
wherein Q is reactive power, E is electromotive force, U s System voltage and X d Is a direct axis synchronous reactance.
Alternatively, the cameras are centralized and distributed cameras.
The application also provides a system for restraining the subsynchronous oscillation of the new energy unit based on the camera, which comprises:
the preprocessing module is used for adding a subsynchronous oscillation damping control link to an excitation system of a camera arranged in the new energy enrichment area;
the first adjusting module is used for acquiring a corresponding relation from a damping control link of the excitation system to output current of the stator side;
the second adjusting module is used for adding a secondary synchronous frequency electric quantity adjusting link to the excitation system and determining the transmission characteristic of secondary synchronous current/voltage between a rotor and a stator winding of the phase-change machine;
the suppression module is used for controlling the phase regulator to output reverse voltage or current to the power grid according to a preset damping control strategy when the fact that the sub-synchronous frequency band oscillation component exists in the voltage or current of the phase regulator end is monitored, so that sub-synchronous oscillation suppression of the new energy unit is completed;
under the reactive condition of a camera, the relation among reactive power, electromotive force and excitation system voltage input by the excitation system is as follows:
wherein Q is reactive power, E is electromotive force, U s System voltage and X d Is a direct axis synchronous reactance.
Alternatively, the cameras are centralized and distributed cameras.
The application utilizes the centralized or distributed phase-adjusting device which is installed in the new energy enrichment region, when subsynchronous oscillation caused by new energy stations occurs in the region, obvious subsynchronous frequency band components appear in the system current, and when the fact that the subsynchronous frequency band current of the system reaches the subsynchronous frequency band oscillation components is detected, an additional damping control device of a phase-adjusting device excitation system controls the phase-adjusting device to output reverse subsynchronous frequency band current to the system, so that the new energy subsynchronous oscillation is restrained.
The application provides a camera for restraining subsynchronous oscillation of a new energy unit, which is expected to have better effect on economy and controllability.
Drawings
FIG. 1 is a flow chart of a method for restraining subsynchronous oscillation of a new energy unit based on a camera;
FIG. 2 is a chart showing a stator side current frequency after 10Hz input is added to an excitation side of a 300Mvar rated capacity camera based on a method for restraining subsynchronous oscillation of a new energy unit by the camera;
FIG. 3 is a current spectrum of a stator side after 40Hz input is added to an excitation side of a 300Mvar rated capacity camera based on a method for restraining subsynchronous oscillation of a new energy unit by the camera;
FIG. 4 is a chart showing a current frequency spectrum of a stator side after 10Hz input is added to an excitation side of a 50Mvar rated capacity governor based on a method for restraining subsynchronous oscillation of a new energy unit by the governor;
FIG. 5 is a graph of a stator side current spectrum after 40Hz input is added to the excitation side of a 50Mvar rated capacity governor based on a method for restraining subsynchronous oscillation of a new energy unit by the governor;
fig. 6 is a system structure for suppressing subsynchronous oscillation of a new energy unit based on a camera.
Detailed Description
The exemplary embodiments of the present application will now be described with reference to the accompanying drawings, however, the present application may be embodied in many different forms and is not limited to the examples described herein, which are provided to fully and completely disclose the present application and fully convey the scope of the application to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the application. In the drawings, like elements/components are referred to by like reference numerals.
Unless otherwise indicated, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, it will be understood that terms defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The application discloses a method for restraining subsynchronous oscillation of a new energy unit based on a camera, which is shown in figure 1 and comprises the following steps:
a subsynchronous oscillation damping control link is added to an excitation system of a camera installed in the new energy enrichment area;
acquiring a corresponding relation from a damping control link of an excitation system to output current of a stator side;
adding a secondary synchronization frequency electric quantity adjusting link to the excitation system, and determining the transmission characteristic of secondary synchronization current/voltage between a rotor and a stator winding of the phase-change regulator;
when the fact that the voltage or the current of the phase-adjusting machine end has the subsynchronous frequency band oscillation component is monitored, the phase-adjusting machine is controlled to output reverse voltage or current to the power grid according to a preset damping control strategy, and subsynchronous oscillation suppression of the new energy unit is completed.
Wherein, the camera is a centralized and distributed camera.
Under the reactive condition of a camera, the relation among reactive power, electromotive force and excitation system voltage input by the excitation system is as follows:
wherein Q is reactive power, E is electromotive force, U s System voltage and X d Is of the same straight axisStep reactance.
The new energy enrichment area camera generally considers two access modes: high capacity centralized access and low capacity distributed access.
According to the existing research results, the total capacity required by the distributed small-capacity camera access is slightly smaller than that of the large-capacity centralized access, and for a large-scale new energy source sending system, the total capacity of the camera used for the system safety and stability is about hundreds to thousands of Mvar, wherein the capacity camera is added with a proper subsynchronous excitation damping control strategy, so that a larger damping effect can be generated on subsynchronous oscillation generated by surrounding new energy stations.
Considering a large-capacity centralized type camera and a small-capacity distributed type camera respectively, taking typical parameters of a certain manufacturer as an example, adding 10-40Hz input (considering amplitude limiting of an excitation control link) in a control link of a camera excitation system, examining stator side current output of the camera, and typical spectrum waveforms are shown in fig. 2-5, wherein the camera can output current with corresponding frequency by adding control in the excitation system, and can play a role in suppressing subsynchronous oscillation by setting a proper additional damping control strategy, and as can be seen from fig. 2-5, the suppression effect of the larger-capacity camera on subsynchronous frequency band components is better, and the suppression effect of the camera on the subsynchronous frequency band components with higher frequency is better.
The application discloses a system 200 for restraining subsynchronous oscillation of a new energy unit based on a camera, as shown in fig. 6, comprising:
the preprocessing module 201 is used for adding a subsynchronous oscillation damping control link to an excitation system of a camera installed in the new energy enrichment area;
the first adjusting module 202 acquires a corresponding relation from a damping control link of the excitation system to output current of the stator side;
the second adjusting module 203 adds a secondary synchronization frequency electric quantity adjusting link in the excitation system to determine the transmission characteristic of the secondary synchronization current/voltage between the rotor and the stator winding of the phase-change machine;
the suppression module 204 is used for controlling the phase regulator to output reverse voltage or current to the power grid according to a preset damping control strategy when the fact that the sub-synchronous frequency band oscillation component exists in the voltage or current of the phase regulator end is monitored, so that sub-synchronous oscillation suppression of the new energy unit is completed;
under the reactive condition of a camera, the relation among reactive power, electromotive force and excitation system voltage input by the excitation system is as follows:
wherein Q is reactive power, E is electromotive force, U s System voltage and X d Is a direct axis synchronous reactance.
Wherein, the camera is a centralized and distributed camera.
The application utilizes the centralized or distributed phase-adjusting device which is installed in the new energy enrichment region, when subsynchronous oscillation caused by new energy stations occurs in the region, obvious subsynchronous frequency band components appear in the system current, and when the fact that the subsynchronous frequency band current of the system reaches the subsynchronous frequency band oscillation components is detected, an additional damping control device of a phase-adjusting device excitation system controls the phase-adjusting device to output reverse subsynchronous frequency band current to the system, so that the new energy subsynchronous oscillation is restrained.
It will be appreciated by those skilled in the art that 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 scheme in the embodiment of the application can be realized by adopting various computer languages, such as object-oriented programming language Java, an transliteration script language JavaScript and the like.
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 flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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.
While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (4)
1. A method for suppressing subsynchronous oscillations of a new energy unit based on a camera, the method comprising:
a subsynchronous oscillation damping control link is added to an excitation system of a camera installed in the new energy enrichment area;
acquiring a corresponding relation from a damping control link of an excitation system to output current of a stator side;
adding a secondary synchronization frequency electric quantity adjusting link to the excitation system, and determining the transmission characteristic of secondary synchronization current/voltage between a rotor and a stator winding of the phase-change regulator;
when the fact that the voltage or the current of the phase-adjusting machine end has a subsynchronous frequency band oscillation component is monitored, controlling the phase-adjusting machine to output reverse voltage or current to a power grid according to a preset damping control strategy, and completing subsynchronous oscillation suppression of the new energy unit;
under the reactive condition of a camera, the relation among reactive power, electromotive force and excitation system voltage input by the excitation system is as follows:
wherein Q is reactive power, E is electromotive force, U s System voltage and X d Is a direct axis synchronous reactance.
2. The method of claim 1, the camera being a centralized and distributed camera.
3. A system for suppressing subsynchronous oscillations of a new energy unit based on a camera, the system comprising:
the preprocessing module is used for adding a subsynchronous oscillation damping control link to an excitation system of a camera arranged in the new energy enrichment area;
the first adjusting module is used for acquiring a corresponding relation from a damping control link of the excitation system to output current of the stator side;
the second adjusting module is used for adding a secondary synchronous frequency electric quantity adjusting link to the excitation system and determining the transmission characteristic of secondary synchronous current/voltage between a rotor and a stator winding of the phase-change machine;
the suppression module is used for controlling the phase regulator to output reverse voltage or current to the power grid according to a preset damping control strategy when the fact that the sub-synchronous frequency band oscillation component exists in the voltage or current of the phase regulator end is monitored, so that sub-synchronous oscillation suppression of the new energy unit is completed;
under the reactive condition of a camera, the relation among reactive power, electromotive force and excitation system voltage input by the excitation system is as follows:
wherein Q is reactive power, E is electromotive force, U s System voltage and X d Is a direct axis synchronous reactance.
4. The system of claim 3, the camera being a centralized and distributed camera.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011202543.3A CN112600222B (en) | 2020-11-02 | 2020-11-02 | Method and system for restraining subsynchronous oscillation of new energy unit based on camera |
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| CN202011202543.3A CN112600222B (en) | 2020-11-02 | 2020-11-02 | Method and system for restraining subsynchronous oscillation of new energy unit based on camera |
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| CN112600222A CN112600222A (en) | 2021-04-02 |
| CN112600222B true CN112600222B (en) | 2023-12-05 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101630844A (en) * | 2009-08-06 | 2010-01-20 | 中国电力科学研究院 | Novel subsynchronous oscillation damping controller |
| CN109830969A (en) * | 2018-09-13 | 2019-05-31 | 国网青海省电力公司 | A kind of method and system inhibiting fired power generating unit sub-synchronous oscillation |
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- 2020-11-02 CN CN202011202543.3A patent/CN112600222B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101630844A (en) * | 2009-08-06 | 2010-01-20 | 中国电力科学研究院 | Novel subsynchronous oscillation damping controller |
| CN109830969A (en) * | 2018-09-13 | 2019-05-31 | 国网青海省电力公司 | A kind of method and system inhibiting fired power generating unit sub-synchronous oscillation |
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