CN112531664B - Method for reducing bus single-phase short-circuit current by flexible direct-current control mode - Google Patents
Method for reducing bus single-phase short-circuit current by flexible direct-current control mode Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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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 application discloses a method and a system for reducing bus single-phase short-circuit current in a flexible direct-current control mode. Wherein the method comprises the following steps: adopting a simulation program of power system analysis software to establish a time domain simulation data model of the flexible direct current converter station accessed to a near region of a power grid; setting a control mode of the flexible direct current control system as a typical flexible direct current control mode according to the time domain simulation data model; judging whether the bus single-phase short-circuit current of the near-zone station of the power grid exceeds the maximum breaking current of a breaker configured by the near-zone station of the power grid according to the time domain simulation data model; and under the condition that the bus single-phase short-circuit current exceeds the maximum opening current of the circuit breaker, reactive power of a typical flexible direct-current control mode is adjusted to a preset threshold value, so that the bus single-phase short-circuit current is reduced.
Description
Technical Field
The application relates to the technical field of power systems, in particular to a method for reducing bus single-phase short-circuit current in a flexible direct-current control mode.
Background
In operation of the power system, a single-phase short-circuit fault is one of the most common faults, and the generated single-phase short-circuit current can have serious influence and consequences on the safe and stable operation of the power system. The flexible direct current transmission technology has the functions of active and reactive independent control, passive system power supply and direct current networking capability, and engineering application is wider and wider worldwide, so that a solution is provided for novel transmission modes such as passive network power supply and asynchronous power grid interconnection and the construction of a strong power grid. So far, nearly 30 flexible direct current transmission projects and nearly hundred conventional direct current transmission projects are put into operation worldwide. But the single-phase short-circuit current of the bus after the flexible direct current transmission system is connected to the receiving-end power grid is not well restrained.
Aiming at the technical problem that the single-phase short-circuit current of a bus after a flexible direct current transmission system is connected to a receiving-end power grid in the prior art is not well inhibited, no effective solution is proposed at present.
Disclosure of Invention
The embodiment of the disclosure provides a method for reducing bus single-phase short-circuit current by a flexible direct-current control mode, which at least solves the technical problem that the bus single-phase short-circuit current of a flexible direct-current transmission system after being connected to a receiving-end power grid is not well inhibited in the prior art.
According to one aspect of the disclosed embodiments, there is provided a method for reducing a bus single-phase short-circuit current by a flexible direct-current control mode, including: adopting a simulation program of power system analysis software to establish a time domain simulation data model of the flexible direct current converter station accessed to a near region of a power grid; setting a control mode of the flexible direct current control system as a typical flexible direct current control mode according to the time domain simulation data model; judging whether the bus single-phase short-circuit current of the near-zone station of the power grid exceeds the maximum breaking current of a breaker configured by the near-zone station of the power grid according to the time domain simulation data model; and under the condition that the bus single-phase short-circuit current exceeds the maximum opening current of the circuit breaker, reactive power of a typical flexible direct-current control mode is adjusted to a preset threshold value, so that the bus single-phase short-circuit current is reduced.
According to another aspect of the embodiments of the present disclosure, there is also provided a system for reducing a bus single-phase short-circuit current by a flexible dc control method, including: the data model building module is used for building a time domain simulation data model of the flexible direct current converter station accessed to the near region of the power grid by adopting a simulation program of power system analysis software; the control mode determining module is used for setting the control mode of the flexible direct current control system as a typical flexible direct current control mode according to the time domain simulation data model; the module is used for judging whether the bus single-phase short-circuit current of the near-zone station of the power grid exceeds the maximum open-circuit current of the circuit breaker configured by the near-zone station of the power grid according to the time domain simulation data model when the control mode of the flexible direct-current control system is set to be a typical flexible direct-current control mode; and the reactive power adjusting module is used for adjusting the reactive power of a typical flexible direct current control mode to a preset threshold value under the condition that the bus single-phase short-circuit current exceeds the maximum opening current of the circuit breaker, so that the bus single-phase short-circuit current is reduced.
According to the application, the amplitude/phase of the contribution positive sequence current during the short-circuit fault of the flexible direct current converter station is changed by adjusting the reactive power control mode and the fixed value of the flexible direct current converter station. The change of the superposition relation of the flexible direct-current contribution positive sequence current component and the alternating-current short-circuit current component vector effectively inhibits the short-circuit current of the near-area single-phase of the converter station after the flexible direct-current contribution positive sequence current component and the alternating-current short-circuit current component vector enter the power grid. And further, the technical problem that the single-phase short circuit current of the bus after the flexible direct current transmission system is connected to the receiving-end power grid in the prior art is not well inhibited is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate and explain the present disclosure, and together with the description serve to explain the present disclosure. In the drawings:
FIG. 1 is a flow chart of a method for reducing bus single-phase short-circuit current by flexible DC control according to an embodiment of the present disclosure;
FIG. 2 is a flow chart of a method for reducing bus single-phase short-circuit current by flexible DC control according to an embodiment of the disclosure;
FIG. 3 is a schematic flow diagram of a flexible DC near zone grid structure according to an embodiment of the disclosure; and
fig. 4 is a schematic diagram of a system for reducing bus single-phase short-circuit current by flexible dc control according to an embodiment of the present disclosure.
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.
According to a first aspect of the present embodiment, a method for reducing bus single-phase short-circuit current by a flexible dc control scheme is provided. Fig. 1 shows a schematic flow chart of the method, and referring to fig. 1, the method includes:
s102: adopting a simulation program of power system analysis software to establish a time domain simulation data model of the flexible direct current converter station accessed to a near region of a power grid;
s104: setting a control mode of the flexible direct current control system as a typical flexible direct current control mode according to the time domain simulation data model;
s106: judging whether the bus single-phase short-circuit current of the near-zone station of the power grid exceeds the maximum breaking current of a breaker configured by the near-zone station of the power grid according to the time domain simulation data model; and
s108: and under the condition that the bus single-phase short-circuit current exceeds the maximum opening current of the circuit breaker, reactive power of a typical flexible direct-current control mode is adjusted to a preset threshold value, so that the bus single-phase short-circuit current is reduced.
Specifically, referring to FIG. 2, a simulation program of power system analysis software, such as a PSD-BPA simulation program, is employed. The station-level control mode of the flexible direct-current transmission system is set as a typical control mode. By carrying out one-by-one short-circuit fault time domain simulation analysis on buses of stations of a power grid accessed to a near zone by a converter station, the short-circuit current (Ik) level of each station is researched, and the analysis range and the number of the stations can be determined according to actual conditions (the current situation difference of the short-circuit current level is different in view of flexible direct capacity and different scales of the accessed power grid, and the size of the area to be analyzed is also different).
Judging whether the short-circuit current level exceeds the standard, determining according to whether the station short-circuit current IK obtained through simulation calculation exceeds the maximum breaking current of a breaker configured by the station, and if the calculated short-circuit current exceeds the maximum breaking capacity of the station protection equipment, judging that the station short-circuit current IK exceeds the standard. And under the condition that the bus single-phase short-circuit current exceeds the maximum breaking current of the breaker, carrying out short-circuit current management by adjusting the reactive power control mode of the flexible direct current converter station. Analysis has shown that the short-circuit current effect of the near zone can be reduced when the fixed reactive power control is adopted and the control fixed value is negative.
Referring to fig. 3, a flexible direct current near-area grid structure of a domestic flexible direct current engineering near-area bus alternating current short-circuit current calculation scene is shown in fig. 3, wherein a node 18 is a flexible direct current end, and a converter station is controlled by adopting constant direct current voltage and constant alternating current voltage; node 19 is the receiving end and the converter station is controlled by fixed active power and fixed alternating voltage.
Firstly, a near-area electromagnetic transient simulation model of a flexible direct current converter station is established, and in order to improve the calculation efficiency, an alternating current system adopts simplified equivalent network processing. And analyzing the single-phase short-circuit current level of the near-area node bus of the convertor station through electromagnetic transient simulation. Taking the node 32 having a certain electrical distance from the flexible dc converter station as an example, the suitability of the proposed method for reducing the bus short-circuit current level is verified.
Firstly, in a typical control mode, the sending end determines direct current voltage and reactive power, and the receiving end determines active power and alternating current voltage, and the single-phase short-circuit current of the node 32 is 46.28kA; and judging that the bus single-phase short-circuit current level is higher, and taking measures to control.
The soft-dc converter station control mode is switched to reduce the problem of high short-circuit current at node 32. Firstly, the reactive power control mode of the transmitting and receiving end is converted into constant reactive power control, and the control constant value is set to be 0MVar (reactive power outflow alternating current system 0 MVar).
The short-circuit current level of the node 32 is calculated to be 45.11kA by simulation analysis; and judging that the bus single-phase short-circuit current level is higher, and taking measures to control.
Continuously adjusting the control mode of the converter station, inhibiting the short-circuit current level of the node 32, and adjusting the control mode of the converter station to be constant reactive power control-10 MVar (reactive outflow alternating current system 10 MVar); calculating short-circuit current 43.44kA;
therefore, the method can effectively reduce the single-phase short-circuit current level of the bus in the near area of the flexible direct current converter station.
Table 1 comparison of short-circuit current calculation results
Therefore, the amplitude/phase of the contribution positive sequence current during the short-circuit fault of the flexible direct current converter station is changed by adjusting the reactive power control mode and the fixed value of the flexible direct current converter station. The change of the superposition relation of the flexible direct-current contribution positive sequence current component and the alternating-current short-circuit current component vector effectively inhibits the short-circuit current of the near-area single-phase of the converter station after the flexible direct-current contribution positive sequence current component and the alternating-current short-circuit current component vector enter the power grid. And further, the technical problem that the single-phase short circuit current of the bus after the flexible direct current transmission system is connected to the receiving-end power grid in the prior art is not well inhibited is solved.
Optionally, the time domain simulation data model comprises simulation analysis data of a flexible direct current control system, a flexible direct current control protection system and a near-area alternating current power grid, and a time domain simulation data model of the flexible direct current converter station accessed to the near-area of the power grid is established.
Optionally, according to the time domain simulation data model, setting the control mode of the flexible direct current control system to be a typical flexible direct current control mode includes: according to the time domain simulation data model, setting an active control mode of a sending end of the flexible direct current control system as direct current voltage, and setting a reactive control mode of the sending end of the flexible direct current control system as reactive power; and setting the active control mode of the receiving end of the flexible direct current control system as active power and the reactive control mode of the receiving end of the flexible direct current control system as reactive power or alternating current voltage according to the time domain simulation data model.
Specifically, according to the time domain simulation data model, setting an active control mode of a sending end of the flexible direct current control system as direct current voltage, and setting a reactive control mode of the sending end of the flexible direct current control system as reactive power; and setting the active control mode of the receiving end of the flexible direct current control system as active power and the reactive control mode of the receiving end of the flexible direct current control system as reactive power (for example, +10 MVar) or alternating current voltage according to the time domain simulation data model.
Optionally, in a case that the bus single-phase short-circuit current exceeds the maximum opening current of the circuit breaker, adjusting reactive power of a typical flexible direct current control mode to a predetermined threshold value, thereby reducing the bus single-phase short-circuit current, including: and under the condition that the bus single-phase short-circuit current exceeds the maximum breaking current of the breaker, reactive power of a reactive power control mode of a receiving end of the flexible direct current control system is adjusted to a first preset threshold value, the bus single-phase short-circuit current is promoted to be reduced, and the reduced bus single-phase short-circuit current is determined.
Specifically, when the bus single-phase short-circuit current Ik exceeds the maximum opening current of the breaker, reactive power of a reactive control mode of a receiving end of the flexible direct-current control system is adjusted to a first preset threshold value, for example, 0MVar, so that the bus single-phase short-circuit current Ik is reduced, and the reduced bus single-phase short-circuit current is determined.
Optionally, in the case that the bus single-phase short-circuit current exceeds the maximum opening current of the circuit breaker, the reactive power of the typical flexible direct current control mode is adjusted to a predetermined threshold value, so as to reduce the bus single-phase short-circuit current, and the method further includes: judging whether the reduced bus single-phase short-circuit current exceeds the maximum breaking current of a breaker configured at a near-zone station of the power grid; and under the condition that the reduced bus single-phase short-circuit current exceeds the maximum breaking current of the breaker, reactive power of a reactive power control mode of a receiving end of the flexible direct current control system is adjusted to a second preset threshold value, the reduced bus single-phase short-circuit current is caused to be reduced again, and the bus single-phase short-circuit current which is reduced again is determined.
Specifically, judging whether the reduced bus single-phase short-circuit current exceeds the maximum breaking current of a breaker configured at a near-zone station of the power grid; and under the condition that the reduced bus single-phase short-circuit current exceeds the maximum breaking current of the breaker, the reactive power of the reactive power control mode of the receiving end of the flexible direct current control system is adjusted to a second preset threshold value, for example, -10MVar, so that the reduced bus single-phase short-circuit current is reduced again, and the re-reduced bus single-phase short-circuit current is determined.
Therefore, the amplitude/phase of the contribution positive sequence current during the short-circuit fault of the flexible direct current converter station is changed by adjusting the reactive power control mode and the fixed value of the flexible direct current converter station. The change of the superposition relation of the flexible direct-current contribution positive sequence current component and the alternating-current short-circuit current component vector effectively inhibits the short-circuit current of the near-area single-phase of the converter station after the flexible direct-current contribution positive sequence current component and the alternating-current short-circuit current component vector enter the power grid. And further, the technical problem that the single-phase short circuit current of the bus after the flexible direct current transmission system is connected to the receiving-end power grid in the prior art is not well inhibited is solved.
In accordance with another aspect of this embodiment, a system 400 for reducing bus single-phase short-circuit current by flexible DC control is provided. The system 400 includes: the data model building module 410 is configured to build a time domain simulation data model of the flexible direct current converter station accessing the near region of the power grid by adopting a simulation program of power system analysis software; the control mode determining module 420 is configured to set a control mode of the flexible direct current control system to be a typical flexible direct current control mode according to the time domain simulation data model; the judging whether standard exceeding module 430 is configured to judge whether a bus single-phase short-circuit current of a near-area station of the power grid exceeds a maximum open-circuit current of a circuit breaker configured by the near-area station of the power grid according to the time domain simulation data model when the control mode of the flexible direct-current control system is set to be a typical flexible direct-current control mode; and an adjustment reactive power module 440 for adjusting reactive power of a typical flexible direct current control mode to a predetermined threshold value in case that the bus single-phase short-circuit current exceeds the maximum open-circuit current of the circuit breaker, thereby reducing the bus single-phase short-circuit current.
Optionally, the time domain simulation data model includes simulation analysis data of the flexible direct current control system, the flexible direct current control protection system and the near-area alternating current power grid.
Optionally, the determining control mode module 420 includes: the setting sending end control mode submodule is used for setting an active control mode of a sending end of the flexible direct current control system as direct current voltage and setting a reactive control mode of the sending end of the flexible direct current control system as reactive power according to the time domain simulation data model; and the receiving end control mode setting submodule is used for setting the active control mode of the receiving end of the flexible direct current control system as active power and setting the reactive control mode of the receiving end of the flexible direct current control system as reactive power or alternating current voltage according to the time domain simulation data model.
Optionally, adjusting the reactive power module 440 includes: and the busbar single-phase short-circuit current reducing sub-module is used for adjusting reactive power of a reactive power control mode of a receiving end of the flexible direct current control system to a first preset threshold value under the condition that the busbar single-phase short-circuit current exceeds the maximum breaking current of the breaker, so as to promote the busbar single-phase short-circuit current to be reduced and determine the reduced busbar single-phase short-circuit current.
Optionally, adjusting the reactive power module 440 further comprises: judging whether the standard exceeding sub-module is used for judging whether the reduced bus single-phase short-circuit current exceeds the maximum breaking current of a breaker configured at a near-zone station of the power grid; and the sub-module is used for reducing the single-phase short-circuit current of the bus again, and adjusting the reactive power of the reactive control mode of the receiving end of the flexible direct current control system to a second preset threshold value under the condition that the reduced single-phase short-circuit current of the bus exceeds the maximum breaking current of the breaker, so that the reduced single-phase short-circuit current of the bus is reduced again, and the reduced single-phase short-circuit current of the bus is determined.
The system 400 for reducing the single-phase short-circuit current of the bus by the flexible direct-current control method according to the embodiment of the present application corresponds to a method for reducing the single-phase short-circuit current of the bus by the flexible direct-current control method according to another embodiment of the present application, and is not described herein.
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 (6)
1. A method for reducing bus single-phase short-circuit current by a flexible direct-current control mode, comprising the following steps:
adopting a simulation program of power system analysis software to establish a time domain simulation data model of the flexible direct current converter station accessed to a near region of a power grid;
setting a control mode of the flexible direct current control system as a typical flexible direct current control mode according to the time domain simulation data model;
judging whether the bus single-phase short-circuit current of the near-zone station of the power grid exceeds the maximum breaking current of a breaker configured by the near-zone station of the power grid according to the time domain simulation data model; and
when the bus single-phase short-circuit current exceeds the maximum opening current of the breaker, reactive power in a typical flexible direct current control mode is adjusted to a preset threshold value, so that the bus single-phase short-circuit current is reduced;
according to the time domain simulation data model, setting a control mode of the flexible direct current control system as a typical flexible direct current control mode, including:
according to the time domain simulation data model, setting an active control mode of a sending end of the flexible direct current control system as direct current voltage, and setting a reactive control mode of the sending end of the flexible direct current control system as reactive power; and
according to the time domain simulation data model, setting an active control mode of a receiving end of the flexible direct current control system as active power, and setting a reactive control mode of the receiving end of the flexible direct current control system as reactive power or alternating current voltage;
and when the bus single-phase short-circuit current exceeds the maximum opening current of the breaker, adjusting reactive power of a typical flexible direct-current control mode to a preset threshold value so as to reduce the bus single-phase short-circuit current, wherein the method comprises the following steps of:
and under the condition that the bus single-phase short-circuit current exceeds the maximum breaking current of the breaker, reactive power of a reactive power control mode of a receiving end of the flexible direct current control system is adjusted to a first preset threshold value, the bus single-phase short-circuit current is promoted to be reduced, and the reduced bus single-phase short-circuit current is determined.
2. The method of claim 1, wherein the time domain simulation data model comprises simulation analysis data of a flexible direct current control system, a flexible direct current control protection system, and a near-area alternating current power grid.
3. The method of claim 1, wherein reactive power in a typical flexible dc control mode is adjusted to a predetermined threshold value in the event that the bus single-phase short-circuit current exceeds the maximum open-circuit current of the circuit breaker, thereby reducing the bus single-phase short-circuit current, further comprising:
judging whether the reduced bus single-phase short-circuit current exceeds the maximum breaking current of a breaker configured at a near-zone station of the power grid; and
and under the condition that the reduced bus single-phase short-circuit current exceeds the maximum breaking current of the breaker, reactive power of a reactive power control mode of a receiving end of the flexible direct current control system is adjusted to a second preset threshold value, the reduced bus single-phase short-circuit current is caused to be reduced again, and the bus single-phase short-circuit current which is reduced again is determined.
4. A system for reducing bus single-phase short-circuit current by flexible direct current control, comprising:
the data model building module is used for building a time domain simulation data model of the flexible direct current converter station accessed to the near region of the power grid by adopting a simulation program of power system analysis software;
the control mode determining module is used for setting the control mode of the flexible direct current control system as a typical flexible direct current control mode according to the time domain simulation data model;
the module is used for judging whether the bus single-phase short-circuit current of the near-zone station of the power grid exceeds the maximum breaking current of the circuit breaker configured by the near-zone station of the power grid according to the time domain simulation data model when the control mode of the flexible direct-current control system is set to be a typical flexible direct-current control mode; and
the reactive power adjusting module is used for adjusting reactive power of a typical flexible direct current control mode to a preset threshold value under the condition that the bus single-phase short-circuit current exceeds the maximum opening current of the circuit breaker, so that the bus single-phase short-circuit current is reduced;
the control mode determining module comprises:
the setting sending end control mode submodule is used for setting an active control mode of a sending end of the flexible direct current control system as direct current voltage and setting a reactive control mode of the sending end of the flexible direct current control system as reactive power according to the time domain simulation data model; and
the receiving end control mode setting submodule is used for setting an active control mode of a receiving end of the flexible direct current control system as active power and setting a reactive control mode of the receiving end of the flexible direct current control system as reactive power or alternating current voltage according to the time domain simulation data model;
adjusting the reactive power module, comprising:
and the busbar single-phase short-circuit current reducing sub-module is used for adjusting reactive power of a reactive control mode of a receiving end of the flexible direct current control system to a first preset threshold value under the condition that the busbar single-phase short-circuit current exceeds the maximum breaking current of the breaker, so that the busbar single-phase short-circuit current is reduced, and the reduced busbar single-phase short-circuit current is determined.
5. The system of claim 4, wherein the time domain simulation data model comprises simulation analysis data of a flexible direct current control system, a flexible direct current control protection system, and a near-area alternating current power grid.
6. The system of claim 4, wherein adjusting the reactive power module further comprises:
judging whether the standard exceeding sub-module is used for judging whether the reduced bus single-phase short-circuit current exceeds the maximum breaking current of a breaker configured at a near-zone station of the power grid; and
and the sub-module is used for adjusting the reactive power of the reactive power control mode of the receiving end of the flexible direct current control system to a second preset threshold value under the condition that the reduced single-phase short-circuit current of the bus exceeds the maximum breaking current of the breaker, so that the reduced single-phase short-circuit current of the bus is reduced again, and the reduced single-phase short-circuit current of the bus is determined.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110620495A (en) * | 2019-08-22 | 2019-12-27 | 中国电力科学研究院有限公司 | Method and device for restraining VSC short-circuit current |
| CN111509753A (en) * | 2020-03-20 | 2020-08-07 | 中国电力科学研究院有限公司 | Method and system for controlling short-circuit current in near zone of converter station |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110620495A (en) * | 2019-08-22 | 2019-12-27 | 中国电力科学研究院有限公司 | Method and device for restraining VSC short-circuit current |
| CN111509753A (en) * | 2020-03-20 | 2020-08-07 | 中国电力科学研究院有限公司 | Method and system for controlling short-circuit current in near zone of converter station |
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