CN115882447A - Method and system for recovering operation of power distribution network after fault - Google Patents
Method and system for recovering operation of power distribution network after fault Download PDFInfo
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- CN115882447A CN115882447A CN202211399648.1A CN202211399648A CN115882447A CN 115882447 A CN115882447 A CN 115882447A CN 202211399648 A CN202211399648 A CN 202211399648A CN 115882447 A CN115882447 A CN 115882447A
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention provides a method and a system for recovering operation after a power distribution network fault, which comprise the following steps: starting from a substation outlet switch at the upstream of a fault area, sequentially searching interconnection switches connected with the line according to the line topology, recording the interconnection switches if the interconnection switches are closed, and otherwise, continuing searching; sequentially searching and marking the first non-contact switch in the position division according to the circuit topology from the substation outlet switch, and after marking, not continuously searching; sequentially disconnecting the recorded contact switches according to the recording sequence and closing the switches until all the contact switches are disconnected; releasing the closing locking state of the non-interconnection switch and closing the switch; and after all the line switches are electrified and switched on, the switching-on locking state of each interconnection switch is released.
Description
Technical Field
The invention belongs to the technical field of feeder automation of a power distribution network, and particularly relates to a method and a system for recovering operation of the power distribution network after a fault.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
Feeder automation refers to an automated measure for realizing fault autonomous positioning, isolation and power supply recovery after a fault occurs on a feeder (medium-voltage transmission line), and comprises three implementation modes, namely a centralized control mode, an on-site control mode and a distributed control mode.
The traditional in-situ feeder automation function describes the process of fault isolation and non-fault line power supply by matching the section switch with the substation outlet switch after a line fault occurs, but does not explain how the whole line recovers normal operation after the fault is eliminated.
At present, the switch is operated by a master station in a remote control mode or a manual local operation mode. When the topology of the line is complex, the conventional recovery method may have a problem of misoperation.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a method for recovering operation after a power distribution network fault, which can effectively reduce the power failure times of users and improve the power supply reliability.
To achieve the above object, one or more embodiments of the present invention provide the following technical solutions:
in a first aspect, a method for recovering operation after a power distribution network fault is disclosed, which comprises:
starting from a substation outlet switch at the upstream of a fault area, sequentially searching interconnection switches connected with the line according to the line topology, recording the interconnection switches if the interconnection switches are closed, and otherwise, continuing searching;
sequentially searching and marking a first non-contact switch in a branch position according to the line topology from an outlet switch of the transformer substation, and after marking, not continuously searching;
sequentially disconnecting the recorded contact switches according to the recording sequence and closing the switches until all the contact switches are disconnected;
the opening and locking state of the non-interconnection switch is released, and the switch is closed;
and after all the line switches are powered on and switched on, the switching-on locking state of each interconnection switch is released.
In a second aspect, a system for restoring operation of a power distribution network after a fault is disclosed, comprising:
a tie switch closure lookup module configured to: starting from a substation outlet switch at the upstream of a fault area, sequentially searching interconnection switches connected with the line according to the line topology, recording the interconnection switches if the interconnection switches are closed, and otherwise, continuing searching;
a non-tie switch lookup module configured to: sequentially searching and marking a first non-contact switch in a branch position according to the line topology from an outlet switch of the transformer substation, and after marking, not continuously searching;
a tie switch processing module configured to: sequentially disconnecting the recorded contact switches according to the recording sequence and closing the switches until all the contact switches are disconnected;
a non-tie switch processing module configured to: the opening and locking state of the non-interconnection switch is released, and the switch is closed;
a resume run module configured to: after all the line switches are powered on and switched on, the switching-on locking state of each interconnection switch is released, and the whole line recovers operation.
The above one or more technical solutions have the following beneficial effects:
after the fault of the line is eliminated, the technical scheme of the invention firstly operates the interconnection switch which supplies power to the line to enable the interconnection switch to be sequentially switched off and closed in a locking way, then the closed and closed state of the original fault upstream switch is removed, the power supply of the whole line is recovered through the upstream transformer substation of the line, and finally the closed and closed state of the interconnection switch which supplies power to the line is removed. In the technical scheme of the invention, the mode of firstly disconnecting the contact and then restoring the power supply is adopted, and the method is suitable for the site where the loop closing operation of the circuit is not allowed.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a flow chart of the present invention for restoring power;
fig. 2 is a line topology with a fault point isolated and a non-fault section completed for transfer in an embodiment of the present invention. The system comprises a CB, a FS1-FS6, LSW1-LSW3, a line section switch, a branch switch, a tie switch and a fault point, wherein the CB is a substation outlet circuit breaker, the FS1-FS6 are line section and branch switches, the LSW1-LSW3 are tie switches, and the k is a fault point;
FIG. 3 is a schematic diagram of an embodiment of the invention with the tie switch powered off;
FIG. 4 is a schematic diagram of a sectionalizer releasing a closing lock and closing in an embodiment of the invention;
FIG. 5 is a schematic diagram of a circuit according to an embodiment of the present invention fully recovering normal operation;
FIG. 6 is a schematic diagram of a circuit loop in a preferred embodiment of the present invention.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention.
The embodiments and features of the embodiments of the invention may be combined with each other without conflict.
Example one
Referring to fig. 1, the present embodiment discloses a method for recovering operation after a power distribution network failure, which includes the following steps:
(1) Starting from a substation outlet switch at the upstream of a fault area, sequentially searching interconnection switches connected with the line according to the line topology, recording the interconnection switches if the interconnection switches are closed, and otherwise, continuing searching;
when the interconnection switch connected with the circuit is searched in sequence, the state of the interconnection switch and the voltages on two sides are collected to judge based on the dynamic topology of the circuit before the fault, if the switch state is closed and both sides have pressure, the interconnection switch is closed, if the state of the interconnection switch is separated and one side has pressure, and if the other side has no pressure, the interconnection switch is disconnected, and the search is terminated.
(2) Sequentially searching and marking a first non-contact switch in a branch position according to the line topology from an outlet switch of the transformer substation, and after marking, not continuously searching;
specifically, when the first non-contact switch in the branch position is searched in sequence, remote control or local remote control is applied based on a recovery strategy after the fault, and the non-contact switch in the branch position is determined when the switch state is judged to be changed from the combination time to the time sharing.
The non-interconnection switches comprise section switches and substation outlet switches.
(3) Sequentially disconnecting all the interconnection switches in the step (1) according to the recording sequence and closing the switches in a locking way until all the interconnection switches are disconnected;
in this step, the closing is locked to prevent misoperation, because the closing misoperation may be closed again on the fault line, so that the whole line is powered off or personnel injury is caused when the fault is overhauled by personnel.
(4) Releasing the opening and locking state of the non-interconnection switch in the step (2) and closing the switch;
in this step, the above operation is to prevent an erroneous operation, which causes a power failure to the user.
(5) And (4) after all the switches with the line isolation fault are powered on and switched on, the switching-on locking state of each interconnection switch in the step (3) is released, and the master station in the step has the advantages that a dispatcher can participate, so that the safety of the whole system is ensured.
In the step (1), the searching process of the interconnection switch is generally carried out by the main station, and can also depend on-site investigation under special conditions, and the searching process of the switch in the step (2) is the same.
It should be noted that the closing lock applied to the interconnection switch in step (3) is irrelevant to the "double-side press-lock closing" in the interconnection switch function, and the same process is performed when the lock is released in step (5).
The step (4) is divided into the following two conditions according to the type of the locked switch:
(4.1) if the section switch is adopted, the closing lock of the section switch is generally required to be Y time limit lock, and after the lock is released, the switch can be automatically closed after the continuous power-on time of the transformer substation side is greater than X time limit;
the Y time limit locking refers to that the locking switch is switched on due to power loss within Y time limit in fault processing.
And (4.2) if the transformer substation outlet switch is adopted, the closing lock of the transformer substation outlet switch is normally a 'reclosing lock', and after the lock is released, the switch may need to be manually closed.
The reclosing locking refers to that the locking switch is closed when the reclosing times are up in fault processing.
In the step (4), if a fault is detected after the non-interconnection switch is superposed, the fault is processed according to the preset fault processing logic action of the line, and the step (5) is the same as the step. The process may terminate post-failure recovery operations, and proceed to handle the failure.
According to the scheme, after the fault of the line is removed, firstly, the interconnection switch which is supplied to the line is operated to enable the interconnection switch to be sequentially switched off and locked and switched on, then the switching-on locking state of the original fault upstream switch is released, the whole-line power supply is recovered through the upstream transformer substation of the line, and finally the switching-on locking state of the interconnection switch which is supplied to the line is released.
When the operation dynamic topology of the topology suitable for the method has different characteristics of voltage and frequency, another scheme which can be realized is as follows: the outlet switch is switched on downwards sequentially, and then the interconnection switch which is switched on before is switched off. The mode can effectively reduce the power failure times of users and improve the power supply reliability. However, in view of the damage to the line caused by the instantaneous impact and circulation of the loop, such sites generally have one of the following conditions:
(1) The topology is a single-connection hand-in-hand line, and the lines on two sides of the connection are different outgoing lines of the same bus of the same transformer substation;
(2) The topology is a single-connection hand-in-hand line, the lines on two sides of the connection are different outgoing lines of different buses of the same transformer substation, and the two buses are allowed to run in parallel;
(3) The topology is a single-connection hand-in-hand line, the lines on two sides of the connection are different outgoing lines of different buses of the same transformer substation, and each section switch has a synchronization detection function.
Fig. 2 shows a line topology with complete fault isolation, and the line states are as follows:
(1) The section switch FS1 is in Y time limit locking, and the section switches FS2 and FS4 are in X time limit locking;
(2) The outlet switch CB is closed, the tie switches LSW1 and LSW3 are closed, the section switches FS3, FS5 and FS6 are closed, and the lines outside the faulty section are all restored to power.
Now, assuming that the fault k is eliminated and the line is required to recover the normal operation state, the following steps are performed:
(1) Starting from an outlet switch CB, sequentially searching whether a next switch is a switched-on interconnection switch or a switched-off non-interconnection switch or not to the downstream of a line, finally searching whether interconnection switches LSW1 and LSW3 are closed, and recording the information, wherein a section switch FS1 is the first non-interconnection switch in a separation position;
(2) Sequentially disconnecting the interconnection switches LSW1 and LSW3, locking and switching on, and disconnecting the power failure of FS3, FS5 and FS6, as shown in FIG. 3;
(3) Releasing the closing locking of the section switch FS1, waiting for the section switch FS1 to be powered on and closed, and then waiting for the section switches FS2-FS6 to be powered on and closed, as shown in FIGS. 4 and 5;
(4) And releasing the closing lock of the LSW1 and the LSW 3.
If the preferred scheme is adopted, the method comprises the following steps:
(1) Starting from an outlet switch CB, sequentially searching whether a next switch is a switched-on interconnection switch or a switched-off non-interconnection switch or not to the downstream of a line, finally searching whether interconnection switches LSW1 and LSW3 are closed, and recording the information, wherein a section switch FS1 is the first non-interconnection switch in a separation position;
(2) Closing the section switch FS1 and releasing the closing lock thereof, and waiting for the section switches FS2 and FS4 to be electrically closed, as shown in fig. 6;
(3) The interconnection switches LSW1 and LSW3 are sequentially turned off and the double-sided pressure latch is released, as shown in fig. 5.
Example two
The present embodiment is directed to a computer device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method when executing the computer program.
EXAMPLE III
An object of the present embodiment is to provide a computer-readable storage medium.
A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned method.
Example four
The purpose of this embodiment is to provide a system that resumes operation after distribution network trouble, includes:
a tie switch closure lookup module configured to: starting from a substation outlet switch at the upstream of a fault area, sequentially searching interconnection switches connected with the line according to the line topology, recording the interconnection switches if the interconnection switches are closed, and otherwise, continuing searching;
a non-tie switch lookup module configured to: sequentially searching and marking the first non-contact switch in the position division according to the circuit topology from the substation outlet switch, and after marking, not continuously searching;
a tie switch processing module configured to: sequentially disconnecting the recorded contact switches according to the recording sequence and closing the switches until all the contact switches are disconnected;
a non-tie switch processing module configured to: releasing the closing locking state of the non-interconnection switch and closing the switch;
a resume run module configured to: after all the line switches are powered on and switched on, the switching-on locking state of each interconnection switch is released, and the whole line recovers operation.
The steps involved in the apparatuses of the above second, third and fourth embodiments correspond to the first embodiment of the method, and the detailed description thereof can be found in the relevant description of the first embodiment. The term "computer-readable storage medium" should be taken to include a single medium or multiple media containing one or more sets of instructions; it should also be understood to include any medium that is capable of storing, encoding or carrying a set of instructions for execution by a processor and that cause the processor to perform any of the methods of the present invention.
Those skilled in the art will appreciate that the modules or steps of the present invention described above can be implemented using general purpose computer means, or alternatively, they can be implemented using program code that is executable by computing means, such that they are stored in memory means for execution by the computing means, or they are separately fabricated into individual integrated circuit modules, or multiple modules or steps of them are fabricated into a single integrated circuit module. The present invention is not limited to any specific combination of hardware and software.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (10)
1. A method for recovering operation of a power distribution network after a fault is characterized by comprising the following steps:
starting from a substation outlet switch at the upstream of a fault area, sequentially searching interconnection switches connected with the line according to the line topology, recording the interconnection switches if the interconnection switches are closed, and otherwise, continuing searching;
sequentially searching and marking a first non-contact switch in a branch position according to the line topology from an outlet switch of the transformer substation, and after marking, not continuously searching;
sequentially disconnecting the recorded contact switches according to the recording sequence and closing the switches in a locking way until all the contact switches are disconnected;
the opening and locking state of the non-interconnection switch is released, and the switch is closed;
and after all the line switches are powered on and switched on, the switching-on locking state of each interconnection switch is released.
2. The method for recovering the operation of the distribution network after the fault is solved according to claim 1, wherein when the interconnection switches connected with the line are searched in sequence, the state of the interconnection switches and the voltages on the two sides are collected and judged based on the dynamic topology of the line before the fault, if the state of the interconnection switches is closed and the two sides have the voltages, the interconnection switches are closed, if the state of the interconnection switches is separated and one side has the voltage, and the other side has no voltage, the interconnection switches are opened, and the searching is terminated.
3. The method as claimed in claim 1, wherein when the first non-contact switch in the index is searched in sequence, remote control is applied or local control is applied based on the strategy of recovery after fault, and when the switch state is judged to be changed from on time to off time, the non-contact switch in the index is determined.
4. The method of claim 1, wherein the non-tie switches include a sectionalizer and a substation outlet switch.
5. The method according to claim 1, wherein the non-interconnected switch is released from the open-close locking state and closed, wherein if the non-interconnected switch is a section switch, the closed-close locking state is a "Y time limit locking state", and after the closed-close locking state is released, the switch is automatically closed after the continuous power-on time of the substation side is greater than an X time limit;
the Y-time limit locking refers to that the locking switch is closed due to power loss in the Y-time limit in fault processing.
6. The method for recovering the operation of the distribution network after the fault is solved according to claim 1, wherein if the substation exit switch is adopted, the closing lock of the substation exit switch is a reclosing lock, and after the reclosing is released, the switch may need to be manually closed;
the reclosing locking refers to that the locking switch is closed when the reclosing times are up in fault processing.
7. A method for restoring operation to a power distribution network after a fault as claimed in any one of claims 1 to 6, wherein the method is adapted to be used in a field where the circuit does not allow closed loop operation.
8. A system for recovering operation of a power distribution network after a fault is characterized by comprising:
a tie switch closure lookup module configured to: starting from a substation outlet switch at the upstream of a fault area, sequentially searching interconnection switches connected with the line according to the line topology, recording the interconnection switches if the interconnection switches are closed, and otherwise, continuing searching;
a non-tie switch lookup module configured to: sequentially searching and marking the first non-contact switch in the position division according to the circuit topology from the substation outlet switch, and after marking, not continuously searching;
a tie switch processing module configured to: sequentially disconnecting the recorded contact switches according to the recording sequence and closing the switches until all the contact switches are disconnected;
a non-tie switch processing module configured to: the opening and locking state of the non-interconnection switch is released, and the switch is closed;
a resume run module configured to: after all the line switches are powered on and switched on, the switching-on locking state of each interconnection switch is released, and the operation of the whole line is recovered.
9. A computer arrangement comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the steps of the method as claimed in any one of claims 1 to 7 are performed by the processor when executing the program.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, is adapted to carry out the steps of the method according to any one of the preceding claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211399648.1A CN115882447A (en) | 2022-11-09 | 2022-11-09 | Method and system for recovering operation of power distribution network after fault |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211399648.1A CN115882447A (en) | 2022-11-09 | 2022-11-09 | Method and system for recovering operation of power distribution network after fault |
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| CN115882447A true CN115882447A (en) | 2023-03-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211399648.1A Pending CN115882447A (en) | 2022-11-09 | 2022-11-09 | Method and system for recovering operation of power distribution network after fault |
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| CN (1) | CN115882447A (en) |
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- 2022-11-09 CN CN202211399648.1A patent/CN115882447A/en active Pending
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