CN110071490B - Single-pole line overload control method and system of multi-terminal flexible direct-current power grid - Google Patents
Single-pole line overload control method and system of multi-terminal flexible direct-current power grid Download PDFInfo
- Publication number
- CN110071490B CN110071490B CN201910343264.XA CN201910343264A CN110071490B CN 110071490 B CN110071490 B CN 110071490B CN 201910343264 A CN201910343264 A CN 201910343264A CN 110071490 B CN110071490 B CN 110071490B
- Authority
- CN
- China
- Prior art keywords
- line
- overload
- power
- fault
- direct
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000005520 cutting process Methods 0.000 claims description 36
- 230000006855 networking Effects 0.000 claims 8
- 238000006243 chemical reaction Methods 0.000 claims 2
- 230000005404 monopole Effects 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 10
- 238000004590 computer program Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
Images
Classifications
-
- 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
Abstract
The application discloses a single-pole line overload control method and system of a multi-terminal flexible direct-current power grid, which specifically comprise the following steps: when a single-pole line fault occurs in a direct current power grid, the phenomenon of line overload can be caused, at the moment, a fault line is cut off by a direct current breaker, then the power of a sending end converter station of the overload line is transferred to the other pole of the station, if the load still exists after the transfer, the power of the sending end converter station of the fault line is transferred to the other pole of the station, and if the load still exists after the transfer, the power of the sending end converter station of the overload line is reduced until the overload of the line disappears. Through the operation, the power of the power grid can be effectively transmitted, and the overload phenomenon is avoided.
Description
Technical Field
The application relates to the technical field of electric power, in particular to a single-pole line overload control method and system of a multi-terminal flexible direct-current power grid.
Background
The multi-end flexible direct-current power grid is formed by interconnecting a plurality of converter stations in a large range, power bidirectional transmission can be achieved, reasonable power distribution is achieved, and flexibility and reliability of the system are enhanced. When a symmetric bipolar flexible direct current transmission system has a single-pole line fault, the power of the local pole line cannot be transmitted outwards, so that the phenomenon of overload of the line of the flexible direct current transmission system is caused, and potential hazards are brought to the safe and stable operation of a power grid.
Disclosure of Invention
In view of the above, the present application provides a method and a system for controlling overload of a single-pole line, which are used for controlling a multi-segment flexible dc power transmission system to avoid the overload phenomenon.
In order to achieve the above object, the following solutions are proposed:
a unipolar line overload control method of a multi-terminal flexible direct current power grid, the multi-terminal flexible direct current power grid comprising N converter stations which are mutually connected, wherein N is a natural number and is greater than or equal to 3, the unipolar line overload control method comprising the steps of:
when the direct-current power grid has a single-pole line fault, firstly cutting off a fault line by a direct-current breaker, then transferring the power of the overload line sending end converter station to the other pole of the station, if the overload still exists after the transfer, transferring the power of the fault line sending end converter station to the other pole of the station, and if the overload still exists after the transfer, reducing the power of the overload line sending end converter station until the overload disappears; alternatively, the first and second electrodes may be,
when the direct-current power grid has a single-pole line fault, firstly cutting off the fault line by the direct-current circuit breaker, then transferring the power of the overload line sending end converter station to the other pole of the station, and if the overload still exists after transferring, reducing the power of the overload line sending end converter station until the line overload disappears; alternatively, the first and second electrodes may be,
when the direct-current power grid has a single-pole line fault, a fault line is cut off by a direct-current breaker, after a direct-current line fault tripping signal is received by safety control, a fan is cut off according to the principle that the total power of a sending end does not exceed the total power of a receiving end, and then power switching is carried out according to the sequence of switching the inter-electrode power of a converter station of a loaded line and switching the inter-electrode power of the converter station of the loaded line until the line overload disappears; alternatively, the first and second electrodes may be,
when the direct current power grid has a single-pole line fault, the direct current breaker cuts off the fault line, and after receiving a direct current line fault tripping signal, the fan is cut off according to the principle that the total power of a sending end does not exceed the total power of a receiving end. And preferentially cutting off a fan of the overload line sending end converter station, and then completing power transfer of the overload line sending end converter station until the line overload disappears.
Optionally, the converters are connected by an overhead line, a ring network is formed between the poles 1 and 2 of each station, and a ring network is formed between the poles 1 and 2.
Optionally, the method further includes:
and when the direct current power grid has a fault, the direct current breaker is used for removing the fault.
Optionally, the method further includes:
the upper layer control is used for coordinating other converter stations to carry out interelectrode power band switching;
and the lower layer control is used for enabling the converter station to carry out interelectrode power transfer.
A single-pole line overload control system of a multi-terminal flexible direct current power grid, the multi-terminal flexible direct current power grid comprising N converter stations which are connected with each other, wherein N is a natural number and is greater than or equal to 3, the single-pole line overload control system comprising a first control module, a second control module, a third control module or a fourth control module, wherein:
the first control module is used for cutting off a fault line by the direct-current circuit breaker when the direct-current power grid has a single-pole line fault, then transferring the power of the overload line sending end converter station to the other pole of the station, transferring the power of the fault line sending end converter station to the other pole of the station if the overload still exists after the belt transfer, and reducing the power of the overload line sending end converter station until the line overload disappears if the overload still exists after the belt transfer;
the second control module is used for cutting off a fault line by the direct-current circuit breaker when the direct-current power grid has a single-pole line fault, then transferring the power of the overload line sending end converter station to the other pole of the station, and reducing the power of the overload line sending end converter station until the line overload disappears if the overload still exists after the transfer;
and the third control module is used for firstly cutting off a fault line by the direct-current circuit breaker when the direct-current power grid has a single-pole line fault, and cutting off the fan according to the principle that the total power of a sending end does not exceed the total power of a receiving end after receiving a direct-current line fault tripping signal through safety control. And then carrying out power band switching according to the sequence of switching the inter-electrode power of the converter station with the load circuit firstly and switching the inter-electrode power of the converter station with the fault circuit secondly until the overload of the circuit disappears.
And the fourth control module is used for firstly cutting off a fault line by the direct-current circuit breaker when a single-pole line fault occurs in the direct-current power grid, cutting off a fan according to the principle that the total power of a sending end does not exceed the total power of a receiving end after receiving a direct-current line fault tripping signal through safety control, preferentially cutting off the fan of the sending end converter station of the overload line, and then completing power transfer of the sending end converter station of the overload line until the overload of the line disappears.
Optionally, the converters are connected by an overhead line, a ring network is formed between the poles 1 and 2 of each station, and a ring network is formed between the poles 1 and 2.
Optionally, the method further includes:
and the fifth control module is used for controlling the direct current breaker to carry out fault removal when the direct current power grid has a fault.
Optionally, the method further includes:
the sixth control module is used for coordinating other converter stations to perform inter-pole power band switching through upper-layer control;
and the seventh control module is used for enabling the converter station to carry out interelectrode power transfer through lower layer control.
According to the technical scheme, the application discloses a single-pole line overload control method and system of a multi-terminal flexible direct-current power grid, and the method comprises the following specific steps: when a single-pole line fault occurs in a direct-current power grid, the phenomenon of overload of the line can be caused, at the moment, a fault line is cut off by a direct-current breaker, then the power of a sending end converter station of the overload line is transferred to the other pole of the station, if the overload still occurs after the transfer, the power of the sending end converter station of the fault line is transferred to the other pole of the station, and if the overload still occurs after the transfer, the power of the sending end converter station of the overload line is reduced until the overload of the line disappears; or the direct current breaker cuts off the fault line, then the power of the overload line sending end converter station is transferred to the other pole of the station, if the overload still exists after the transfer, the power of the overload line sending end converter station is reduced until the overload of the line disappears; or, the direct current circuit breaker cuts off a fault line, after receiving a direct current line fault tripping signal under safety control, a fan is cut off according to the principle that the total power of a sending end does not exceed the total power of a receiving end, and then power switching is carried out according to the sequence of switching the inter-electrode power of the converter station of the loaded line and switching the inter-electrode power of the converter station of the fault line until the line overload disappears; or the direct current circuit breaker cuts off a fault line, and after receiving a direct current line fault tripping signal through safety control, the fan is cut off according to the principle that the total power of a sending end does not exceed the total power of a receiving end; and preferentially cutting off a fan of the overload line sending end converter station, and then completing power transfer of the overload line sending end converter station until the line overload disappears. Therefore, the power of the power grid can be effectively transmitted, and the overload phenomenon is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a single-pole line overload control method for a multi-segment flexible dc power grid according to an embodiment of the present application;
fig. 2 is a block diagram of a single pole line overload control system of a multi-segment flexible dc power grid according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Example one
Fig. 1 is a flowchart of a single-pole line overload control method of a multi-segment flexible dc power grid according to an embodiment of the present application.
As shown in fig. 1, the single-pole line overload control method provided in this embodiment is applied to a multi-terminal flexible dc power grid, where the multi-terminal flexible dc power grid includes N converter stations connected to each other, where N is a natural number and is greater than or equal to 3, and the single-pole line overload control method includes the following steps:
when a single-pole line fault occurs in a direct current power grid, the phenomenon of line overload can be caused, at the moment, a fault line is cut off by a direct current breaker, then the power of a sending end converter station of the overload line is transferred to the other pole of the station, if the load still exists after the transfer, the power of the sending end converter station of the fault line is transferred to the other pole of the station, and if the load still exists after the transfer, the power of the sending end converter station of the overload line is reduced until the overload of the line disappears.
Or the direct current breaker cuts off the fault line, then the power of the overload line sending end converter station is carried to the other pole of the station, and if the overload still exists after the power is carried, the power of the overload line sending end converter station is reduced until the overload of the line disappears.
Or the direct-current circuit breaker cuts off a fault line, after safety control receives a direct-current line fault tripping signal, a fan is cut off according to the principle that the total power of a sending end does not exceed the total power of a receiving end, and then power switching is carried out according to the sequence of switching the inter-electrode power of the converter station with the load line firstly and switching the inter-electrode power of the converter station with the fault line secondly until the overload of the line disappears.
Or the direct current circuit breaker cuts off a fault line, and after receiving a direct current line fault tripping signal through safety control, the fan is cut off according to the principle that the total power of the sending end does not exceed the total power of the receiving end. And preferentially cutting off a fan of the overload line sending end converter station, and then completing power transfer of the overload line sending end converter station until the line overload disappears.
According to the technical scheme, the application discloses a single-pole line overload control method of a multi-terminal flexible direct-current power grid, which specifically comprises the following steps: when a single-pole line fault occurs in a direct-current power grid, the phenomenon of overload of the line can be caused, at the moment, a fault line is cut off by a direct-current breaker, then the power of a sending end converter station of the overload line is transferred to the other pole of the station, if the overload still occurs after the transfer, the power of the sending end converter station of the fault line is transferred to the other pole of the station, and if the overload still occurs after the transfer, the power of the sending end converter station of the overload line is reduced until the overload of the line disappears; or the direct current breaker cuts off the fault line, then the power of the overload line sending end converter station is transferred to the other pole of the station, if the overload still exists after the transfer, the power of the overload line sending end converter station is reduced until the overload of the line disappears; or, the direct current circuit breaker cuts off a fault line, after receiving a direct current line fault tripping signal under safety control, a fan is cut off according to the principle that the total power of a sending end does not exceed the total power of a receiving end, and then power switching is carried out according to the sequence of switching the inter-electrode power of the converter station of the loaded line and switching the inter-electrode power of the converter station of the fault line until the line overload disappears; or the direct current circuit breaker cuts off a fault line, and after receiving a direct current line fault tripping signal through safety control, the fan is cut off according to the principle that the total power of a sending end does not exceed the total power of a receiving end; and preferentially cutting off a fan of the overload line sending end converter station, and then completing power transfer of the overload line sending end converter station until the line overload disappears. Therefore, the power of the power grid can be effectively transmitted, and the overload phenomenon is avoided.
The commutations are connected by an overhead line, and a ring network is formed between the poles 1 and 2 and between the poles 1 and 2 of each station.
In addition, still include:
when the direct current power grid has a fault, the direct current breaker is used for removing the fault.
In addition, still include:
the upper layer control is used for coordinating other converter stations to carry out interelectrode power band switching;
and the lower layer control is used for enabling the converter station to carry out interelectrode power transfer.
Example two
Fig. 2 is a block diagram of a single-pole line overload control system of a multi-terminal flexible dc power grid according to an embodiment of the present application.
As shown in fig. 2, in the single-pole line overload control system of the multi-terminal flexible dc power grid provided by the present application, the multi-terminal flexible dc power grid includes N converter stations connected to each other, where N is a natural number and is greater than or equal to 3, and the single-pole line overload control system includes a first control module 10, a second control module 20, a third control module 30, or a fourth control module 40.
The first control module is used for cutting off a fault line by the direct-current circuit breaker when a single-pole line fault occurs in the direct-current power grid, then transferring the power of the overload line sending end converter station to the other pole of the station, transferring the power of the fault line sending end converter station to the other pole of the station if the overload still occurs after the belt transferring, and reducing the power of the overload line sending end converter station until the line overload disappears if the overload still occurs after the belt transferring.
And the second control module is used for cutting off a fault line by the direct-current circuit breaker when a single-pole line fault occurs in the direct-current power grid, then transferring the power of the overload line sending end converter station to the other pole of the station, and reducing the power of the overload line sending end converter station until the line overload disappears if the overload still occurs after the transfer.
And the third control module is used for cutting off a fault line by the direct-current circuit breaker when a single-pole line fault occurs in the direct-current power grid, and cutting off the fan according to the principle that the total power of the sending end does not exceed the total power of the receiving end after receiving a direct-current line fault tripping signal through safety control. And then carrying out power band switching according to the sequence of switching the inter-electrode power of the converter station with the load circuit firstly and switching the inter-electrode power of the converter station with the fault circuit secondly until the overload of the circuit disappears.
And the fourth control module is used for cutting off a fault line by the direct-current circuit breaker when a single-pole line fault occurs in the direct-current power grid, cutting off a fan according to the principle that the total power of a sending end does not exceed the total power of a receiving end after receiving a direct-current line fault tripping signal through safety control, cutting off the fan of the sending end converter station of the overload line preferentially, and completing power transfer of the sending end converter station of the overload line until the overload of the line disappears.
According to the technical scheme, the application discloses a single-pole line overload control system of a multi-terminal flexible direct-current power grid, which specifically comprises the following steps: when a single-pole line fault occurs in a direct-current power grid, the line can be overloaded, at the moment, the first control module is used for firstly cutting off the fault line by the direct-current circuit breaker, then transferring the power of the overload line sending end converter station to the other pole of the station, transferring the power of the fault line sending end converter station to the other pole of the station if the overload still occurs after the transfer, and reducing the power of the overload line sending end converter station until the overload of the line disappears if the overload still occurs after the transfer; the second control module is used for firstly cutting off a fault line by the direct-current circuit breaker, then transferring the power of the overload line sending end converter station to the other pole of the station, and reducing the power of the overload line sending end converter station until the line overload disappears if the overload still exists after the transfer; the third control module is used for firstly cutting off a fault line by the direct-current circuit breaker, after receiving a direct-current line fault tripping signal through safety control, cutting off a fan according to the principle that the total power of a sending end does not exceed the total power of a receiving end, and then carrying out power switching according to the sequence of switching the inter-electrode power of the converter station of the loaded line and switching the inter-electrode power of the converter station of the fault line until the overload of the line disappears; the fourth control module is used for firstly cutting off a fault line by the direct-current circuit breaker, and cutting off the fan according to the principle that the total power of the sending end does not exceed the total power of the receiving end after receiving a direct-current line fault tripping signal through safety control; and preferentially cutting off a fan of the overload line sending end converter station, and then completing power transfer of the overload line sending end converter station until the line overload disappears. Therefore, the power of the power grid can be effectively transmitted, and the overload phenomenon is avoided.
Optionally, the converters are connected by an overhead line, a ring network is formed between the poles 1 and 2 of each station, and a ring network is formed between the poles 1 and 2.
In addition, the system also comprises a fifth control module, and the fifth control module is used for controlling the direct current breaker to carry out fault removal when the direct current power grid has faults.
In addition, the system also comprises a sixth control system, wherein the sixth control module is used for coordinating other converter stations to perform inter-pole power transfer through upper-layer control;
in addition, the system also comprises a seventh control module, and the seventh control module is used for enabling the converter station to perform interelectrode power transfer through lower layer control.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
As will be appreciated by one of skill in the art, embodiments of the present application may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of 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, embodiments of 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.
Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (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 terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, 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 terminal 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 terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal 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 of these 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 the preferred embodiment and all such alterations and modifications as fall within the true scope of the embodiments of the application.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or terminal equipment comprising the element.
The technical solutions provided by the present application are introduced in detail, and specific examples are applied in the description to explain the principles and embodiments of the present application, and the descriptions of the above examples are only used to help understanding the method and the core ideas of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (8)
1. A single-pole line overload control method for a multi-terminal flexible direct current power grid, the multi-terminal flexible direct current power grid comprising N converter stations which are mutually connected, wherein N is a natural number and is more than or equal to 3, the single-pole line overload control method comprising the steps of:
when the direct-current power grid has a single-pole line fault, firstly cutting off a fault line by a direct-current breaker, under the conditions of networking operation and upper-layer control, transferring the power of the overload line sending end converter station to the other pole of the station, if the overload still exists after the transfer, transferring the power of the fault line sending end converter station to the other pole of the station, and if the overload still exists after the transfer, reducing the power of the overload line sending end converter station until the line overload disappears;
when the direct-current power grid has a single-pole line fault, the direct-current circuit breaker cuts off the fault line, under the condition of networking operation and no upper-layer control, the power of the overload line sending end converter station is transferred to the other pole of the station, and if the overload is still generated after the transfer, the power of the overload line sending end converter station is reduced until the line overload disappears;
when the direct-current power grid has a single-pole line fault, firstly, a fault line is cut off by a direct-current breaker, under the conditions of non-networking operation and upper-layer control, after safety control receives a direct-current line fault tripping signal, a fan is cut off according to the principle that the total power of a sending end does not exceed the total power of a receiving end, then, power switching is carried out according to the sequence of switching the interpolar power of a converter station of a loaded line firstly and switching the interpolar power of the converter station of the fault line secondly until the line overload disappears;
when the direct-current power grid has a single-pole line fault, the direct-current circuit breaker cuts off the fault line, and when the safety control receives a direct-current line fault tripping signal under the conditions of non-networking operation and no upper-layer control, the fan is cut off according to the principle that the total power of a sending end does not exceed the total power of a receiving end; and preferentially cutting off a fan of the overload line sending end converter station, and then completing power transfer of the overload line sending end converter station until the line overload disappears.
2. The unipolar line overload control method of claim 1, wherein:
the current conversion stations are connected through an overhead line, and a ring network is formed between the poles 1 of each station,
A ring network is formed between the poles 2 and 2.
3. The unipolar line overload control method of claim 1, further comprising:
and when the direct current power grid has a fault, the direct current breaker is used for removing the fault.
4. The unipolar line overload control method of claim 1, further comprising:
the upper layer control is used for coordinating other converter stations to carry out interelectrode power band switching;
and the lower layer control is used for enabling the converter station to carry out interelectrode power transfer.
5. The utility model provides a monopole line overload control system of flexible direct current electric wire netting of multiterminal, flexible direct current electric wire netting of multiterminal includes N converter stations of interconnect, and N is the natural number, and more than or equal to 3, its characterized in that, monopole line overload control system includes first control module, second control module, third control module, fourth control module, wherein:
the first control module is used for cutting off a fault line by the direct-current circuit breaker when the direct-current power grid has a single-pole line fault, transferring the power of the overload line sending end converter station to the other pole of the station under the conditions of networking operation and upper-layer control, transferring the power of the fault line sending end converter station to the other pole of the station if the overload is still generated after the transfer, and reducing the power of the overload line sending end converter station until the overload of the line disappears if the overload is still generated after the transfer;
the second control module is used for cutting off a fault line by the direct-current circuit breaker when the direct-current power grid has a single-pole line fault, transferring the power of the overload line sending end converter station to the other pole of the station under the condition of networking operation and no upper-layer control, and reducing the power of the overload line sending end converter station until the line overload disappears if the overload still exists after the transfer;
the third control module is used for cutting off a fault line by the direct-current circuit breaker when a single-pole line fault occurs in the direct-current power grid, cutting off a fan according to the principle that the total power of a sending end does not exceed the total power of a receiving end after safety control receives a direct-current line fault tripping signal under the condition of non-networking operation and upper-layer control, and then carrying out power switching according to the sequence of firstly switching the inter-electrode power of the converter station of the loaded line and then switching the inter-electrode power of the converter station of the fault line until the line overload disappears;
the fourth control module is used for cutting off a fault line by the direct current circuit breaker when a single-pole line fault occurs in the direct current power grid, cutting off a fan according to the principle that the total power of a sending end does not exceed the total power of a receiving end after safety control receives a direct current line fault tripping signal under the condition of non-networking operation and no upper-layer control, cutting off the fan of a sending end converter station of an overload line preferentially, and completing power transfer of the sending end converter station of the overload line until the line overload disappears.
6. The unipolar line overload control system of claim 5, wherein:
the current conversion stations are connected through an overhead line, and a ring network is formed between the poles 1 of each station,
A ring network is formed between the poles 2 and 2.
7. The unipolar line overload control system of claim 5, further comprising:
a fifth control module for controlling the DC breaker to perform the operation when the DC power grid fails
And (5) fault removal.
8. The unipolar line overload control system of claim 5, further comprising:
the sixth control module is used for coordinating other converter stations to perform inter-pole power band switching through upper-layer control;
and the seventh control module is used for enabling the converter station to carry out interelectrode power transfer through lower layer control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910343264.XA CN110071490B (en) | 2019-04-26 | 2019-04-26 | Single-pole line overload control method and system of multi-terminal flexible direct-current power grid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910343264.XA CN110071490B (en) | 2019-04-26 | 2019-04-26 | Single-pole line overload control method and system of multi-terminal flexible direct-current power grid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110071490A CN110071490A (en) | 2019-07-30 |
| CN110071490B true CN110071490B (en) | 2021-06-01 |
Family
ID=67369014
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910343264.XA Active CN110071490B (en) | 2019-04-26 | 2019-04-26 | Single-pole line overload control method and system of multi-terminal flexible direct-current power grid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110071490B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112152204B (en) * | 2020-09-04 | 2022-09-16 | 南方电网科学研究院有限责任公司 | Multi-terminal direct-current single-pole fault power transfer method and device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108039719A (en) * | 2018-01-03 | 2018-05-15 | 山东大学 | Turn the optimal Corrective control method of bipolar Multi-end flexible direct current transmission system of band based on power |
| CN108767886A (en) * | 2018-05-22 | 2018-11-06 | 许继集团有限公司 | A kind of HVDC network Poewr control method and device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003029922A2 (en) * | 2001-10-01 | 2003-04-10 | Kline & Walker, Llc | Pfn/trac system faa upgrades for accountable remote and robotics control |
-
2019
- 2019-04-26 CN CN201910343264.XA patent/CN110071490B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108039719A (en) * | 2018-01-03 | 2018-05-15 | 山东大学 | Turn the optimal Corrective control method of bipolar Multi-end flexible direct current transmission system of band based on power |
| CN108767886A (en) * | 2018-05-22 | 2018-11-06 | 许继集团有限公司 | A kind of HVDC network Poewr control method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110071490A (en) | 2019-07-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2856590B1 (en) | Method of fault clearance | |
| CN107611937B (en) | Overvoltage protection circuit and method of direct current breaker | |
| CN110401230B (en) | Extra-high voltage hybrid direct current system receiving end VSC fault quitting method, equipment and medium | |
| CN103181048A (en) | Voltage balancing of symmetric hvdc monopole transmission lines after earth faults | |
| EP3176898A1 (en) | Power distribution terminal capable of determining fault type and determination method thereof | |
| CN109061385B (en) | Single-phase earth fault detection and positioning isolation method based on transient and steady state information | |
| CN110165642B (en) | Wide area protection method, device and equipment for dealing with direct current voltage loss of adjacent transformer substations | |
| CN102185278A (en) | Extra-high-voltage direct-current power transmission converter station protecting method | |
| CN110071490B (en) | Single-pole line overload control method and system of multi-terminal flexible direct-current power grid | |
| CN111697610B (en) | Bipolar balance control method, device and medium for three-terminal direct-current power transmission system | |
| CN202134890U (en) | Protective device of converter station of special HVDC | |
| CN201160223Y (en) | Multi-ring website system | |
| CN105162088B (en) | A kind of power distribution station automatic fault detection system of 10kV cable system feeder line | |
| CN114157018B (en) | Distributed feeder automation recovery method based on line load rate and peer-to-peer communication | |
| CN113572189B (en) | Bipolar flexible direct current system for offshore wind power and transformer fault switching method thereof | |
| CN113325272B (en) | Hub region fault section discrimination method based on power flow analysis | |
| CN214755544U (en) | Extra-high voltage direct current transmission converter isolation circuit | |
| CN106848999B (en) | Direct current breaker | |
| CN102403700B (en) | High-voltage switch control terminal grounding protection method | |
| CN109256757B (en) | Automatic isolation and reclosing scheme for single-phase earth fault of low-current grounding system | |
| US11909201B2 (en) | Multi-terminal DC power transmission system, common control device thereof, and fault recovery method for multi-terminal DC power transmission system | |
| CN106532755B (en) | Reactive power control system and method for high-voltage direct-current power transmission system | |
| CN212991964U (en) | Device for preventing zero sequence protection from being refused in same-name single-phase fault and protection system applying same | |
| CN111799764B (en) | Method, device and system for preventing zero sequence protection of homonymous single-phase fault from being refused | |
| CN113131452B (en) | Backup protection acceleration method and system for flexible direct current power distribution network |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |