CN112600222A - Method and system for inhibiting subsynchronous oscillation of new energy source unit based on phase modulator - Google Patents
Method and system for inhibiting subsynchronous oscillation of new energy source unit based on phase modulator Download PDFInfo
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- CN112600222A CN112600222A CN202011202543.3A CN202011202543A CN112600222A CN 112600222 A CN112600222 A CN 112600222A CN 202011202543 A CN202011202543 A CN 202011202543A CN 112600222 A CN112600222 A CN 112600222A
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- 230000010355 oscillation Effects 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000002401 inhibitory effect Effects 0.000 title abstract description 8
- 230000005284 excitation Effects 0.000 claims abstract description 44
- 238000013016 damping Methods 0.000 claims abstract description 27
- 230000001629 suppression Effects 0.000 claims abstract description 11
- 238000011217 control strategy Methods 0.000 claims abstract description 9
- 230000002441 reversible effect Effects 0.000 claims abstract description 9
- 238000012546 transfer Methods 0.000 claims abstract description 7
- 238000004804 winding Methods 0.000 claims abstract description 7
- 238000007781 pre-processing Methods 0.000 claims description 3
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- 238000001228 spectrum Methods 0.000 description 4
- 238000003860 storage Methods 0.000 description 3
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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
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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
- H02J2003/365—Reducing harmonics or oscillations in HVDC
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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
- 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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Abstract
The invention discloses a method and a system for inhibiting sub-synchronous oscillation of a new energy unit based on a phase modulator, and belongs to the technical field of sub-synchronous oscillation. The method comprises the following steps: an excitation system of a phase modulator arranged in a new energy enrichment area is additionally provided with a subsynchronous oscillation damping control link; acquiring a corresponding relation from a damping control link of an excitation system to the output current of a stator side; a subsynchronous frequency electrical quantity adjusting link is added in an excitation system, and the transfer characteristic of subsynchronous current/voltage between a phase modulator rotor and a stator winding is determined; when the voltage or current of the phase modulator is monitored to have subsynchronous frequency band oscillation components, the phase modulator is controlled to output reverse voltage or current to a power grid according to a preset damping control strategy, and subsynchronous oscillation suppression of the new energy source unit is completed. The invention adopts the phase modulator to inhibit the subsynchronous oscillation of the new energy source unit, and has better effect on the economical efficiency and controllability.
Description
Technical Field
The invention relates to the technical field of subsynchronous oscillation, in particular to a method and a system for inhibiting subsynchronous oscillation of a new energy source unit based on a phase modulator.
Background
The problem of subsynchronous oscillation can be caused by applying a series compensation technology, a high-voltage direct current transmission (HVDC) technology and large-scale new energy access in an electric power system, the subsynchronous oscillation gradually becomes one of the stable problems of a new energy delivery system along with the rapid development of new energy power generation in China, the phenomenon of subsynchronous oscillation of a new energy weak access system and a double-fed wind power centralized delivery system which are connected by adopting a power electronic converter interface is caused for many times, and the problem of subsynchronous oscillation can be caused by adopting direct-driven wind power and photovoltaic power generation connected by adopting the converter interface to be connected into the weak alternating current system.
At present, the research on the suppression measures of the subsynchronous oscillation of new energy is being carried out in the domestic industry, and unlike the subsynchronous oscillation of fixed frequency points of the traditional turboset, the subsynchronous oscillation frequency of the new energy can drift in a wider frequency band and presents the characteristic of broadband oscillation, therefore, the aim of improving the damping can not be achieved by adopting a fixed-parameter subsynchronous oscillation damping control strategy of the turboset, the research on the stable mechanism, the analysis method and the solution of the diversified power electronic equipment connected to a more complex power system at present is obviously lagged behind the process of power electronization of the power system, due to the lack of systematic research, operators cannot prejudge the occurrence of unknown oscillation in advance, the guidance of control means is insufficient, the control capability of power electronic equipment cannot be fully exerted, and the system safety can be ensured only by means of temporary control measures such as directly cutting off a wind power plant or series compensation capacitor after oscillation occurs.
Disclosure of Invention
In order to solve the above problems, the present invention provides a method for suppressing the sub-synchronous oscillation of a new energy source unit based on a phase modulator, which comprises:
an excitation system of a phase modulator arranged in a new energy enrichment area is additionally provided with a subsynchronous oscillation damping control link;
acquiring a corresponding relation from a damping control link of an excitation system to the output current of a stator side;
a subsynchronous frequency electrical quantity adjusting link is added in an excitation system, and the transfer characteristic of subsynchronous current/voltage between a phase modulator rotor and a stator winding is determined;
when the voltage or current of the phase modulator is monitored to have subsynchronous frequency band oscillation components, the phase modulator is controlled to output reverse voltage or current to a power grid according to a preset damping control strategy, and subsynchronous oscillation suppression of the new energy source unit is completed.
Optionally, the phase modulator is a centralized or distributed phase modulator.
Optionally, the relation between the reactive power input by the excitation system, the electromotive force and the excitation system voltage is in the reactive condition of the phase modulator.
The invention also provides a system for inhibiting the subsynchronous oscillation of the new energy unit based on the phase modulator, which comprises the following steps:
the preprocessing module is used for adding a subsynchronous oscillation damping control link to an excitation system of a phase modulator arranged in a new energy enrichment area;
the first adjusting module is used for acquiring the corresponding relation from the damping control link of the excitation system to the output current of the stator side;
the second adjusting module is used for increasing a subsynchronous frequency electrical quantity adjusting link in an excitation system and determining the transfer characteristic of subsynchronous current/voltage between a rotor and a stator winding of the phase modulator;
and the suppression module is used for controlling the phase modulator to output reverse voltage or current to a power grid according to a preset damping control strategy when the voltage or current of the phase modulator is monitored to have subsynchronous frequency band oscillation components, so that subsynchronous oscillation suppression of the new energy source unit is completed.
Optionally, the phase modulator is a centralized or distributed phase modulator.
Optionally, the relation between the reactive power input by the excitation system, the electromotive force and the excitation system voltage is in the reactive condition of the phase modulator.
The invention utilizes a centralized or distributed phase modulator which is arranged in a new energy enrichment area, when subsynchronous oscillation caused by a new energy station occurs in a local area, the system current has obvious subsynchronous frequency band components, and when the subsynchronous frequency band current of the system is detected to reach the subsynchronous frequency band oscillation components, the phase modulator excitation system additional damping control device controls the phase modulator to output reverse subsynchronous frequency band current to the system, thereby playing a role in inhibiting the subsynchronous oscillation of new energy.
The invention adopts the phase modulator to inhibit the subsynchronous oscillation of the new energy source unit, and has better effect on the economical efficiency and controllability.
Drawings
FIG. 1 is a flow chart of a method for suppressing sub-synchronous oscillation of a new energy source unit based on a phase modulator according to the present invention;
FIG. 2 is a stator side current frequency diagram after 10Hz input is added to the excitation side of a 300Mvar phase modulator with rated capacity based on the method for suppressing the sub-synchronous oscillation of a new energy source unit by a phase modulator of the invention;
FIG. 3 is a stator side current spectrum after 40Hz input is added to the excitation side of a 300Mvar phase modulator with a rated capacity based on the method of the invention for suppressing the sub-synchronous oscillation of a new energy source unit by a phase modulator;
FIG. 4 is a stator side current spectrum diagram after 10Hz input is added to the excitation side of a phase modulator with a rated capacity of 50Mvar based on the method for suppressing the sub-synchronous oscillation of a new energy unit by a phase modulator of the invention;
FIG. 5 is a stator side current spectrum diagram after a rated capacity 50Mvar phase modulator excitation side is added with 40Hz input according to the method for suppressing the sub-synchronous oscillation of a new energy unit based on a phase modulator of the present invention;
fig. 6 is a system structure for suppressing the sub-synchronous oscillation of a new energy source unit based on a phase modulator.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention 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 invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including 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. Further, it will be understood that terms, such as those 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 invention discloses a method for inhibiting subsynchronous oscillation of a new energy source unit based on a phase modulator, which comprises the following steps of:
an excitation system of a phase modulator arranged in a new energy enrichment area is additionally provided with a subsynchronous oscillation damping control link;
acquiring a corresponding relation from a damping control link of an excitation system to the output current of a stator side;
a subsynchronous frequency electrical quantity adjusting link is added in an excitation system, and the transfer characteristic of subsynchronous current/voltage between a phase modulator rotor and a stator winding is determined;
when the voltage or current of the phase modulator is monitored to have subsynchronous frequency band oscillation components, the phase modulator is controlled to output reverse voltage or current to a power grid according to a preset damping control strategy, and subsynchronous oscillation suppression of the new energy source unit is completed.
The phase modulator is a centralized phase modulator and a distributed phase modulator.
The relation among the reactive power input by the excitation system, the electromotive force and the voltage of the excitation system is the reactive condition of the phase modulator.
The relation among the reactive power, the electromotive force and the voltage of the excitation system input by the excitation system is as follows:
wherein Q is reactive power, E is electromotive force, UsSystem voltage and XdIs a direct axis synchronous reactance.
Two access modes are generally considered for a phase modulator in a new energy enrichment area: large capacity centralized access, and small capacity distributed access.
According to the existing research results, the total capacity required by the access of the distributed small-capacity phase modulator is slightly smaller than that of the large-capacity centralized access, and for a large-scale new energy sending system, the total capacity of the phase modulator used for the safety and stability of the system is about hundreds to thousands of Mvars, wherein the capacity phase modulator is added with a proper subsynchronous excitation damping control strategy, and can generate a larger damping effect on subsynchronous oscillation generated by peripheral new energy field stations.
The large-capacity centralized phase modulator and the small-capacity distributed phase modulator are respectively considered, a typical parameter of a certain manufacturer is taken as an example, 10-40Hz input is added in a control link of an excitation system of the phase modulator (amplitude limit of the excitation control link is considered), stator side current output is considered, and a typical frequency spectrum waveform is shown in figures 2-5.
The invention discloses a system 200 for suppressing subsynchronous oscillation of a new energy source unit based on a phase modulator, 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 phase modulator arranged in a new energy enrichment area;
the first adjusting module 202 is used for acquiring the corresponding relation from the damping control link of the excitation system to the output current of the stator side;
the second adjusting module 203 is used for increasing a subsynchronous frequency electrical quantity adjusting link in the excitation system and determining the transfer characteristic of subsynchronous current/voltage between a phase modulator rotor and a stator winding;
and the suppression module 204 is used for controlling the phase modulator to output reverse voltage or current to the power grid according to a preset damping control strategy when the voltage or current of the phase modulator is monitored to have subsynchronous frequency band oscillation components, so as to complete subsynchronous oscillation suppression of the new energy source unit.
The phase modulator is a centralized phase modulator and a distributed phase modulator.
The relation among the reactive power input by the excitation system, the electromotive force and the voltage of the excitation system is the reactive condition of the phase modulator.
The invention utilizes a centralized or distributed phase modulator which is arranged in a new energy enrichment area, when subsynchronous oscillation caused by a new energy station occurs in a local area, the system current has obvious subsynchronous frequency band components, and when the subsynchronous frequency band current of the system is detected to reach the subsynchronous frequency band oscillation components, the phase modulator excitation system additional damping control device controls the phase modulator to output reverse subsynchronous frequency band current to the system, thereby playing a role in inhibiting the subsynchronous oscillation of new energy.
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 scheme in the embodiment of the application can be implemented by adopting various computer languages, such as object-oriented programming language Java and transliterated scripting language JavaScript.
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.
While the 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. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (6)
1. A method of suppressing subsynchronous oscillation of a new energy bank based on a phase modulator, the method comprising:
an excitation system of a phase modulator arranged in a new energy enrichment area is additionally provided with a subsynchronous oscillation damping control link;
acquiring a corresponding relation from a damping control link of an excitation system to the output current of a stator side;
a subsynchronous frequency electrical quantity adjusting link is added in an excitation system, and the transfer characteristic of subsynchronous current/voltage between a phase modulator rotor and a stator winding is determined;
when the voltage or current of the phase modulator is monitored to have subsynchronous frequency band oscillation components, the phase modulator is controlled to output reverse voltage or current to a power grid according to a preset damping control strategy, and subsynchronous oscillation suppression of the new energy source unit is completed.
2. The method of claim 1, said phase modulator being a centralized and distributed phase modulator.
3. The method of claim 1, wherein the excitation system input reactive power, electromotive force, and excitation system voltage are related to a reactive condition at the phase modulator.
4. A system for suppressing subsynchronous oscillation of a new energy bank based on a phase modulator, the system comprising:
the preprocessing module is used for adding a subsynchronous oscillation damping control link to an excitation system of a phase modulator arranged in a new energy enrichment area;
the first adjusting module is used for acquiring the corresponding relation from the damping control link of the excitation system to the output current of the stator side;
the second adjusting module is used for increasing a subsynchronous frequency electrical quantity adjusting link in an excitation system and determining the transfer characteristic of subsynchronous current/voltage between a rotor and a stator winding of the phase modulator;
and the suppression module is used for controlling the phase modulator to output reverse voltage or current to a power grid according to a preset damping control strategy when the voltage or current of the phase modulator is monitored to have subsynchronous frequency band oscillation components, so that subsynchronous oscillation suppression of the new energy source unit is completed.
5. The system of claim 4, said phase modulator being a centralized and distributed phase modulator.
6. The system of claim 4, wherein the excitation system input reactive power, electromotive force, and excitation system voltage are related to a reactive condition at the phase modulator.
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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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| 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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