CN116316459A - Operation mode combination method and system for main transformer differential protection sensitivity check - Google Patents

Operation mode combination method and system for main transformer differential protection sensitivity check Download PDF

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Publication number
CN116316459A
CN116316459A CN202211106213.3A CN202211106213A CN116316459A CN 116316459 A CN116316459 A CN 116316459A CN 202211106213 A CN202211106213 A CN 202211106213A CN 116316459 A CN116316459 A CN 116316459A
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CN
China
Prior art keywords
new energy
main transformer
mode
operation mode
checked
Prior art date
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Pending
Application number
CN202211106213.3A
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Chinese (zh)
Inventor
薛志英
余越
王剑锋
张�浩
杨国生
王聪博
张韵琦
曹虹
窦雪薇
蒋帅
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China Electric Power Research Institute Co Ltd CEPRI
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China Electric Power Research Institute Co Ltd CEPRI
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Publication date
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Priority to CN202211106213.3A priority Critical patent/CN116316459A/en
Publication of CN116316459A publication Critical patent/CN116316459A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc 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
    • 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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—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
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy
    • 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
    • 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]

Abstract

The invention discloses an operation mode combination method and system for checking main transformer differential protection sensitivity, and belongs to the technical field of relay protection. The method of the invention comprises the following steps: according to the running experience of the flexible and straight system, and carrying out system simulation on the flexible and straight system, determining the minimum running mode of the flexible and straight system; stopping the new energy power supplies of other new energy stations except the new energy station where the main transformer to be checked is located; arranging and combining the operation mode of the new energy unit carried by the main transformer to be checked with the operation modes of the new energy units carried by the residual main transformer in the new energy station where the checked main transformer is positioned to obtain a new energy unit operation mode combination; and combining the minimum operation mode of the flexible and straight system with the operation mode of the new energy unit, and determining the operation mode combination for checking the main variation differential protection sensitivity to be checked. The invention comprehensively considers different output modes of the new energy power supply and ensures that the sensitivity under various working conditions meets the requirements.

Description

Operation mode combination method and system for main transformer differential protection sensitivity check
Technical Field
The invention relates to the technical field of relay protection, in particular to an operation mode combination method and system for checking main variation differential protection sensitivity.
Background
The north-opening renewable energy flexible direct current power grid test demonstration project is a great scientific demonstration project for constructing the first direct current power grid in the world. The project is provided with two sending end converter stations: health, zhang Bei, a receiving-end converter station: beijing yanqing and an adjusting terminal converter station: a water-pumping energy-storage power station is disclosed. New energy stations such as wind power, photovoltaic and the like in the North Zhang region are mostly connected to nearby soft direct current converter stations through 220kV alternating current lines.
IN the conventional dual-power supply system shown IN fig. 1, the currents IM and IN flowing through the two ends of the line are defined to be IN the positive direction of the bus bar flowing to the line to be protected, i.e., as indicated by the arrows IN the figure. The sum of current phasors at two ends is used as the differential current of the relay, and the difference of the current phasors at two ends is used as the braking current. When faults occur in the line area, currents flowing through the two side protection circuits are basically in the same phase, differential currents are greatly different from braking currents, and the protection circuits have high sensitivity.
For a new energy flexible and straight line, the power supplies at two sides of the line contain a large number of power electronic devices, so that fault current is characterized by limited amplitude and controlled phase angle, the current directions at two sides are easy to swing, and the sensitivity of differential protection is reduced. Similar problems are encountered with differential protection of other devices. Therefore, when a new energy station is newly built and connected into the flexible direct current converter station, and the new energy station is subjected to capacity expansion, the sensitivity of the differential protection fixed values of the components such as the outgoing line and the like are required to be checked, so that the sensitivity of the protection device is ensured when faults occur in the protection range.
Disclosure of Invention
Aiming at the problems, the invention provides an operation mode combination method for checking the main variation differential protection sensitivity, which comprises the following steps:
according to the running experience of the flexible and straight system, and carrying out system simulation on the flexible and straight system, determining the minimum running mode of the flexible and straight system;
stopping the new energy power supplies of other new energy stations except the new energy station where the main transformer to be checked is located;
arranging and combining the operation mode of the new energy unit carried by the main transformer to be checked with the operation modes of the new energy units carried by the residual main transformer in the new energy station where the checked main transformer is positioned to obtain a new energy unit operation mode combination;
and combining the minimum operation mode of the flexible and straight system with the operation mode of the new energy unit, and determining the operation mode combination for checking the main variation differential protection sensitivity to be checked.
Optionally, the operation modes of the main transformer to be checked include: an idle mode of operation and a load mode of operation.
Optionally, before checking the sensitivity of the main transformer, determining that the new energy sending system meets a preset principle, wherein the preset principle is as follows:
the new energy unit takes the connected main transformer as a unit, and the running state is full-sending or shutdown;
if the new energy unit is stopped, only the unit is stopped, the connected transformer is unloaded, and the running mode of the main transformer neutral point is unchanged.
Optionally, the minimum operation mode is an operation mode that the flexible straight side provides the minimum short-circuit current when the alternating current outlet of the converter station fails.
Optionally, the operation modes of the main transformer include: an idle mode of operation and a load mode of operation.
The invention also provides an operation mode combination system for checking the main transformer differential protection sensitivity, which comprises the following steps:
the first computing unit is used for determining the minimum operation mode of the flexible straight system according to the operation experience of the flexible straight system and carrying out system simulation on the flexible straight system;
the control unit is used for stopping the new energy power supplies of other new energy stations except the new energy station where the main transformer to be checked is located;
the second calculation unit is used for arranging and combining the operation modes of the new energy units carried by the main transformer to be checked with the operation modes of the new energy units carried by the residual main transformer in the new energy station where the main transformer to be checked is positioned to obtain a new energy unit operation mode combination;
and the combination unit is used for combining the minimum operation mode of the flexible and straight system with the operation mode of the new energy unit and determining the operation mode combination for checking the main variation differential protection sensitivity to be checked.
Optionally, the operation modes of the main transformer to be checked include: an idle mode of operation and a load mode of operation.
Optionally, before checking the sensitivity of the main transformer, determining that the new energy sending system meets a preset principle, wherein the preset principle is as follows:
the new energy unit takes the connected main transformer as a unit, and the running state is full-sending or shutdown;
if the new energy unit is stopped, only the unit is stopped, the connected transformer is unloaded, and the running mode of the main transformer neutral point is unchanged.
Optionally, the minimum operation mode is an operation mode that the flexible straight side provides the minimum short-circuit current when the alternating current outlet of the converter station fails.
Optionally, the operation modes of the main transformer include: an idle mode of operation and a load mode of operation.
Compared with the prior art, the invention has the beneficial effects that:
the invention considers the operation characteristics of new energy and flexible and straight and the topological structure characteristics of the output network, establishes an operation mode combination method, comprehensively considers different output modes of the new energy power supply, ensures that the sensitivity under various working conditions meets the requirements, and properly simplifies the problems of workload in actual application.
Drawings
FIG. 1 is a conventional dual source power system topology;
FIG. 2 is a flow chart of the method of the present invention;
fig. 3 is a topology diagram of a part of new energy stations accessed by the north-opening converter station according to the embodiment of the invention;
fig. 4 is a block diagram of the system of the present invention.
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 examples described herein, which are provided to fully and completely disclose the present invention and fully convey the scope of the 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, 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 invention provides an operation mode combination method for checking main variation differential protection sensitivity, which is shown in fig. 2 and comprises the following steps:
according to the running experience of the flexible and straight system, and carrying out system simulation on the flexible and straight system, determining the minimum running mode of the flexible and straight system;
stopping the new energy power supplies of other new energy stations except the new energy station where the main transformer to be checked is located;
arranging and combining the operation mode of the new energy unit carried by the main transformer to be checked with the operation modes of the new energy units carried by the residual main transformer in the new energy station where the checked main transformer is positioned to obtain a new energy unit operation mode combination;
and combining the minimum operation mode of the flexible and straight system with the operation mode of the new energy unit, and determining the operation mode combination for checking the main variation differential protection sensitivity to be checked.
The operation mode of the main transformer to be checked comprises the following steps: an idle mode of operation and a load mode of operation.
Before checking the sensitivity of the main transformer, determining that the new energy sending system meets a preset principle, wherein the preset principle is as follows:
the new energy unit takes the connected main transformer as a unit, and the running state is full-sending or shutdown;
if the new energy unit is stopped, only the unit is stopped, the connected transformer is unloaded, and the running mode of the main transformer neutral point is unchanged.
The minimum operation mode is an operation mode that the short-circuit current is minimum on the flexible straight side when the alternating current outlet of the converter station fails.
The operation mode of the main transformer comprises the following steps: an idle mode of operation and a load mode of operation.
Taking a part of new energy stations accessed by the north-opening converter station as an example, the system structure is shown in fig. 3, and taking a B1 main transformer (transformer) in the stations as an example, and performing operation mode combination;
zhang Bei the part of new energy stations accessed by the convertor station runs in a flexible straight small mode;
A. c, D main transformer no-load operation;
b1 main transformer unit full-time and B2 main transformer unit full-time;
b1 main transformer unit is fully sent, and B2 main transformer is in idle running;
b1 main transformer no-load operation, and B2 main transformer full-load operation;
b1 main transformer no-load operation and B2 main transformer no-load operation.
The invention also provides an operation mode combination system 200 for checking the sensitivity of the main transformer differential protection, as shown in fig. 4, comprising:
the first computing unit 201 is configured to determine a minimum operation mode of the flexible and straight system according to operation experience of the flexible and straight system and system simulation of the flexible and straight system;
a control unit 202, configured to deactivate new energy sources of other new energy stations except for the new energy station where the main transformer to be checked is located;
the second calculating unit 203 is configured to arrange and combine an operation mode of the new energy unit carried by the main transformer to be checked with an operation mode of the new energy unit carried by the remaining main transformer in the new energy station where the main transformer to be checked is located, so as to obtain an operation mode combination of the new energy unit;
and the combination unit 204 is used for combining the minimum operation mode of the flexible and straight system with the operation mode of the new energy unit and determining the operation mode combination for checking the main variation differential protection sensitivity to be checked.
The operation mode of the main transformer to be checked comprises the following steps: an idle mode of operation and a load mode of operation.
Before checking the sensitivity of the main transformer, determining that the new energy sending system meets a preset principle, wherein the preset principle is as follows:
the new energy unit takes the connected main transformer as a unit, and the running state is full-sending or shutdown;
if the new energy unit is stopped, only the unit is stopped, the connected transformer is unloaded, and the running mode of the main transformer neutral point is unchanged.
The minimum operation mode is an operation mode that the short-circuit current is minimum on the flexible straight side when the alternating current outlet of the converter station fails.
The operation mode of the main transformer comprises the following steps: an idle mode of operation and a load mode of operation.
Compared with the prior art, the invention has the beneficial effects that:
the invention considers the operation characteristics of new energy and flexible and straight and the topological structure characteristics of the output network, establishes an operation mode combination method, comprehensively considers different output modes of the new energy power supply, ensures that the sensitivity under various working conditions meets the requirements, and properly simplifies the problems of workload in actual application.
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 solutions in the embodiments of the present application may be implemented in various computer languages, for example, object-oriented programming language Java, and an transliterated scripting language JavaScript, etc.
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 in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.

Claims (10)

1. An operation mode combination method for checking main variation differential protection sensitivity, which is characterized by comprising the following steps:
according to the running experience of the flexible and straight system, and carrying out system simulation on the flexible and straight system, determining the minimum running mode of the flexible and straight system;
stopping the new energy power supplies of other new energy stations except the new energy station where the main transformer to be checked is located;
arranging and combining the operation mode of the new energy unit carried by the main transformer to be checked with the operation modes of the new energy units carried by the residual main transformer in the new energy station where the checked main transformer is positioned to obtain a new energy unit operation mode combination;
and combining the minimum operation mode of the flexible and straight system with the operation mode of the new energy unit, and determining the operation mode combination for checking the main variation differential protection sensitivity to be checked.
2. The method according to claim 1, wherein the operation mode of the main transformer to be checked includes: an idle mode of operation and a load mode of operation.
3. The method of claim 1, wherein the new energy delivery system is determined to satisfy a preset rule prior to checking the main transformer sensitivity, the preset rule being as follows:
the new energy unit takes the connected main transformer as a unit, and the running state is full-sending or shutdown;
if the new energy unit is stopped, only the unit is stopped, the connected transformer is unloaded, and the running mode of the main transformer neutral point is unchanged.
4. The method of claim 1, wherein the minimum operating mode is an operating mode in which the flexible direct side provides a minimum short circuit current in the event of a converter station ac outlet fault.
5. The method according to claim 1, wherein the operating mode of the main transformer comprises: an idle mode of operation and a load mode of operation.
6. An operational mode combination system for main-variation differential protection sensitivity check, the system comprising:
the first computing unit is used for determining the minimum operation mode of the flexible straight system according to the operation experience of the flexible straight system and carrying out system simulation on the flexible straight system;
the control unit is used for stopping the new energy power supplies of other new energy stations except the new energy station where the main transformer to be checked is located;
the second calculation unit is used for arranging and combining the operation modes of the new energy units carried by the main transformer to be checked with the operation modes of the new energy units carried by the residual main transformer in the new energy station where the main transformer to be checked is positioned to obtain a new energy unit operation mode combination;
and the combination unit is used for combining the minimum operation mode of the flexible and straight system with the operation mode of the new energy unit and determining the operation mode combination for checking the main variation differential protection sensitivity to be checked.
7. The system of claim 6, wherein the operating mode of the main transformer to be checked comprises: an idle mode of operation and a load mode of operation.
8. The system of claim 6, wherein the new energy delivery system is determined to satisfy a predetermined criteria prior to checking the main transformer sensitivity, the predetermined criteria being as follows:
the new energy unit takes the connected main transformer as a unit, and the running state is full-sending or shutdown;
if the new energy unit is stopped, only the unit is stopped, the connected transformer is unloaded, and the running mode of the main transformer neutral point is unchanged.
9. The system of claim 6, wherein the minimum operating mode is an operating mode in which the flexible direct side provides a minimum short circuit current in the event of a converter station ac outlet fault.
10. The system of claim 6, wherein the main transformer operates in a manner comprising: an idle mode of operation and a load mode of operation.
CN202211106213.3A 2022-09-09 2022-09-09 Operation mode combination method and system for main transformer differential protection sensitivity check Pending CN116316459A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211106213.3A CN116316459A (en) 2022-09-09 2022-09-09 Operation mode combination method and system for main transformer differential protection sensitivity check

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211106213.3A CN116316459A (en) 2022-09-09 2022-09-09 Operation mode combination method and system for main transformer differential protection sensitivity check

Publications (1)

Publication Number Publication Date
CN116316459A true CN116316459A (en) 2023-06-23

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ID=86791160

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
CN (1) CN116316459A (en)

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