CN111200296B - Method for selecting direct-current line fault restarting voltage of high-voltage direct-current power transmission system - Google Patents
Method for selecting direct-current line fault restarting voltage of high-voltage direct-current power transmission system Download PDFInfo
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- CN111200296B CN111200296B CN202010038722.1A CN202010038722A CN111200296B CN 111200296 B CN111200296 B CN 111200296B CN 202010038722 A CN202010038722 A CN 202010038722A CN 111200296 B CN111200296 B CN 111200296B
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- voltage
- restart
- direct current
- direct
- transmission system
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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
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
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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]
Abstract
The invention discloses a method for selecting a direct-current line fault restarting voltage of a high-voltage direct-current power transmission system, which comprises the following steps: adding a function of automatically selecting the restart voltage class into a direct current power transmission control system; when the automatic restart voltage level selection is switched in, after the direct current line fails, the high-voltage direct current transmission system selects the restart voltage level according to the relation between the actual unipolar direct current power and the unipolar rated power; when the restart voltage class automatic selection exits, after the direct current line fails, the high-voltage direct current transmission system is restarted according to a preset voltage class, and the preset restart voltage class is full-voltage restart, 80% voltage reduction restart or 70% voltage reduction restart. The method for selecting the direct-current line fault restart voltage can meet the requirement of direct-current line fault restart and can ensure that the direct-current loss power quantity is minimum after restart.
Description
Technical Field
The invention relates to a direct current transmission technology, in particular to a method for selecting a direct current line fault restarting voltage of a high-voltage direct current transmission system.
Background
The direct current line fault restarting function is a common direct current control function of the high-voltage direct current transmission system, when faults such as grounding and the like occur in the high-voltage direct current line, the direct current line current is rapidly controlled to be zero and the direct current voltage is controlled to be zero through the direct current line fault restarting function, and after a certain line dissociation time, the direct current voltage and the direct current are restarted to establish, so that the purpose of eliminating the direct current line faults is achieved. The direct current voltage reduction restart is beneficial to quickly recovering the line insulation after the direct current system has faults, the restart success rate of the direct current line faults caused by lightning stroke or mountain fire and the like is improved, and unnecessary outage of the high-voltage direct current transmission system can be reduced to a certain extent.
The restarting voltage classes of the high-voltage direct-current transmission system at present comprise full-voltage restarting, 80% voltage-reducing restarting and 70% voltage-reducing restarting, the three restarting voltage classes are set on an HMI interface of an operation workstation through operation personnel, once a certain restarting voltage is set (such as 80% voltage-reducing restarting), the high-voltage direct-current transmission system restarts according to the set voltage class after a direct-current line fault (80% voltage-reducing restarting), and other voltage classes cannot be automatically selected for restarting. In fact, if the 70% step-down restart mode is adopted to a certain extent under the condition of small direct current power quantity, the success probability of the direct current restart can be improved more than that of the 80% step-down restart mode, that is, when the direct current transmission power quantity is small, the step-down restart mode is adopted, which cannot cause direct current power loss and can effectively improve the probability of the direct current restart, so that the step-down restart mode is adopted as much as possible under the condition of low direct current power.
Disclosure of Invention
The invention aims to provide a method for selecting a direct-current line fault restarting voltage of a high-voltage direct-current power transmission system, which can select a restarting voltage grade according to direct-current transmission power so as to meet the requirement of the direct-current line fault restarting and ensure the minimum direct-current loss power after restarting.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a method of dc line fault restart voltage selection for a high voltage dc power transmission system, the method comprising:
adding a function of restarting voltage grade automatic selection into a direct current control system;
when the automatic restart voltage level selection is switched in, after the direct current line fails, the high-voltage direct current transmission system selects the restart voltage level according to the following principle:
if the actual unipolar direct current power of the high-voltage direct current transmission system is greater than 80% of unipolar rated power, the restart voltage class is selected to be 'full-voltage restart';
if the actual unipolar direct current power of the high-voltage direct current transmission system is greater than 70% of unipolar rated power and the actual unipolar direct current power is less than or equal to 80% of unipolar rated power, the restart voltage grade is selected as '80% voltage reduction restart';
if the actual unipolar direct current power of the high-voltage direct current transmission system is less than or equal to 70% of unipolar rated power, the restart voltage class is selected to be 70% voltage reduction restart;
when the restart voltage class automatic selection exits, after the direct current line fails, the high-voltage direct current transmission system is restarted according to the preset voltage class, and the preset restart voltage class comprises full-voltage restart, 80% voltage reduction restart and 70% voltage reduction restart.
Further, the actual unipolar direct current power of the high-voltage direct current transmission system is a unipolar direct current power reference value.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, a function of automatically selecting the restart voltage class is added into the direct-current transmission control system, the high-voltage direct-current transmission system can not only carry out fault restart according to the original mode, but also select the restart voltage class according to the direct-current transmission power, thereby meeting the fault restart requirement of a direct-current line and ensuring the minimum direct-current loss power quantity after restart.
Drawings
Fig. 1 is a flowchart of a dc line fault restart voltage selection method according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1, the present embodiment provides a method for selecting a restart voltage of a dc line fault of a high-voltage dc transmission system, which specifically includes:
(1) setting a control word 'restart voltage level automatic selection' on a direct current operation control interface HMI;
(2) if the HMI is put into automatic restart voltage grade selection, after the direct current line fails, the high-voltage direct current transmission system selects the restart voltage grade according to the following principle:
a) if the actual unipolar direct current power of the high-voltage direct current transmission system is greater than 80% of unipolar rated power, the restart voltage class is selected to be 'full-voltage restart';
b) if the actual unipolar direct current power of the high-voltage direct current transmission system is greater than 70% of unipolar rated power and the actual unipolar direct current power is less than or equal to 80% of unipolar rated power, the restart voltage grade is selected as '80% voltage reduction restart';
c) if the actual unipolar direct current power of the high-voltage direct current transmission system is less than or equal to 70% of unipolar rated power, the restart voltage class is selected to be 70% voltage reduction restart;
(3) if the HMI quits the automatic restart voltage level selection, after the direct current line fails, the high-voltage direct current transmission system is restarted according to a preset voltage level, and the preset restart voltage level can be full-voltage restart, 80% voltage reduction restart or 70% voltage reduction restart.
The actual unipolar direct current power of the high-voltage direct current transmission system is a unipolar direct current power reference value.
In conclusion, the function of automatically selecting the restart voltage class is added into the direct-current transmission control system, the high-voltage direct-current transmission system can perform fault restart according to the original mode and can select the restart voltage class according to the direct-current transmission power, and therefore the fault restart requirement of a direct-current line can be met, and the minimum direct-current loss power quantity after restart can be guaranteed.
The above detailed description is specific to possible embodiments of the present invention, and the embodiments are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the scope of the present invention are intended to be included within the scope of the present invention.
Claims (2)
1. A method for selecting a direct current line fault restart voltage of a high-voltage direct current transmission system is characterized by comprising the following steps: the method comprises the following steps:
adding a function of restarting voltage grade automatic selection into a direct current control system;
when the automatic restart voltage level selection is switched in, after the direct current line fails, the high-voltage direct current transmission system selects the restart voltage level according to the following principle:
if the actual unipolar direct current power of the high-voltage direct current transmission system is greater than 80% of unipolar rated power, the restart voltage class is selected to be 'full-voltage restart';
if the actual unipolar direct current power of the high-voltage direct current transmission system is greater than 70% of unipolar rated power and the actual unipolar direct current power is less than or equal to 80% of unipolar rated power, the restart voltage grade is selected as '80% voltage reduction restart';
if the actual unipolar direct current power of the high-voltage direct current transmission system is less than or equal to 70% of unipolar rated power, the restart voltage class is selected to be 70% voltage reduction restart;
when the restart voltage class automatic selection exits, after the direct current line fails, the high-voltage direct current transmission system is restarted according to the preset voltage class, and the preset restart voltage class comprises full-voltage restart, 80% voltage reduction restart and 70% voltage reduction restart.
2. The method of claim 1 for selecting a restart voltage for a fault in a dc link of a hvdc transmission system, comprising: the actual unipolar direct current power of the high-voltage direct current transmission system is a unipolar direct current power reference value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010038722.1A CN111200296B (en) | 2020-01-14 | 2020-01-14 | Method for selecting direct-current line fault restarting voltage of high-voltage direct-current power transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010038722.1A CN111200296B (en) | 2020-01-14 | 2020-01-14 | Method for selecting direct-current line fault restarting voltage of high-voltage direct-current power transmission system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111200296A CN111200296A (en) | 2020-05-26 |
| CN111200296B true CN111200296B (en) | 2021-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010038722.1A Expired - Fee Related CN111200296B (en) | 2020-01-14 | 2020-01-14 | Method for selecting direct-current line fault restarting voltage of high-voltage direct-current power transmission system |
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| Country | Link |
|---|---|
| CN (1) | CN111200296B (en) |
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2020
- 2020-01-14 CN CN202010038722.1A patent/CN111200296B/en not_active Expired - Fee Related
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| CN111200296A (en) | 2020-05-26 |
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