CN108493928B - Distributed feeder automation distribution line topology ad hoc network method - Google Patents
Distributed feeder automation distribution line topology ad hoc network method Download PDFInfo
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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
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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
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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Abstract
The invention discloses a topological ad hoc network method for a distributed feeder automation distribution line, which comprises the following steps: establishing a switch section, dividing the state of the switch section, and establishing a state conversion mechanism before and after the occurrence and the processing of the fault; and carrying out fault location based on the switch section, and carrying out fault isolation and non-fault area power supply recovery according to a fault location result. According to the invention, rapid fault location, fault isolation and non-fault area recovery power supply are carried out through the distributed FA topology ad hoc network, so that the configuration-free and grid structure change self-adaption of the distributed FA is realized, the configuration of the distributed FA is greatly reduced, and the workload is reduced.
Description
Technical Field
The invention belongs to the technical field of distribution automation, and relates to a distributed feeder automation distribution line topology ad hoc network method.
Background
The implementation of distribution automation is a demand for the development of power systems, and Feeder Automation (FA) technology is a core technology of distribution network automation.
Feeder automation can real time monitoring join in marriage the running state of distribution network and equipment, when joining in marriage the net and break down, can find out the fault area rapidly, and the automatic fault area that keeps apart restores in time not the power supply of fault area user, has shortened user's power failure time, has reduced the power failure area, has improved the power supply reliability. Therefore, feeder automation is the key point of power distribution network construction and transformation and is the inevitable trend of power system modernization.
The existing distributed feeder automation has the problems of complex configuration, incapability of adapting to the change of the network frame topology of the distribution network and the like.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a distributed feeder automation distribution line topology self-networking method, and solves the technical problems that the distributed feeder automation in the prior art is complex in configuration and cannot adapt to the topology change of a distribution network rack.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the distributed feeder automation distribution line topology ad hoc network method comprises the following steps:
establishing a switch section, dividing the state of the switch section, and establishing a state conversion mechanism before and after the occurrence and the processing of the fault;
and carrying out fault location based on the switch section, and carrying out fault isolation and non-fault area power supply recovery according to a fault location result.
The specific method for establishing the switch section is as follows:
representing the electrical distance between each switch and the power supply point by the number of the switches between the corresponding switches and the power supply point on the power supply path;
the electrical distance of the power supply point is initialized to 0, the electrical distance automatically adds 1 every time the power supply path and the direction of the power supply line pass through a node, the electrical distance of each switch is calculated, and each area enclosed by the switches with the electrical distance of 0 is determined as a switch section.
The switch segment states include: two stable states of 'normal' and 'power failure' and two unstable states of 'failure' and 'to be recovered'.
The state transition mechanism is specifically as follows:
when the distribution line suffers permanent fault, the switch section converts the 'normal' state into the 'fault' state, and if the fault isolation is successful, the 'fault' section is converted into the 'power failure' section;
the fault downstream power failure section which causes power failure due to fault isolation is converted into a section to be recovered;
after the fault isolation is finished, the section to be recovered restores the power supply service, and if the power supply is restored successfully, the section to be recovered is converted into a normal section;
the fault is cleared and the "dead" section is automatically or manually restored to power, the section status transitions from "dead" to "normal".
The specific method for fault location is as follows:
a "failed" segment if only one of the switches surrounding the segment is set to the failed flag;
if the section which is greater than or equal to two switches around one switch section and has fault current is a fault upstream section; the section without any switch with fault current is a fault downstream section, namely a section to be recovered;
among the switches that make up the "fault" status segment, the switch that is the smallest electrical distance from the power source is the upstream switch of the fault, otherwise the downstream switch of the fault.
The method for fault isolation and power supply recovery of the non-fault area comprises the following specific steps:
tripping off all switches forming a fault section to carry out fault isolation;
and starting a closing preparation for the interconnection switch of the section to be recovered, if the load of the section to be recovered is smaller than the residual capacity of the standby power supply, executing closing by the closing preparation, and otherwise, canceling the closing preparation.
Compared with the prior art, the invention has the following beneficial effects: according to the invention, rapid fault location, fault isolation and non-fault area recovery power supply are carried out through the distributed FA topology ad hoc network, so that the configuration-free and grid structure change self-adaption of the distributed FA is realized, the configuration of the distributed FA is greatly reduced, and the workload is reduced.
Drawings
FIG. 1 is a schematic diagram of switching segment state transitions.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
According to the distributed feeder automation distribution line topology ad hoc network method, rapid fault location, fault isolation and non-fault area recovery power supply are performed through the distributed FA topology ad hoc network, configuration-free and space truss structure change self-adaption of distributed FA is achieved, configuration of the distributed FA is greatly reduced, and workload is reduced. The method specifically comprises the following steps:
the method comprises the following steps: establishing a switch section as follows:
1.1 determining the supply path and its direction for each power supply Point
For the feeder line, the main power supply of each line refers to a 10KV bus for supplying power to the line, and the outlet breaker of the line is a control switch of the main power supply. The stand-by power supply of the circuit refers to a power supply which can be connected by closing a tie switch, and the tie switch is a control switch of the stand-by power supply. The intelligent terminal at the outlet breaker acquires current real-time load data and the remaining capacity of the power supply by communicating with other local intelligent devices such as a protective relay and the like. And forming a message packet by the information, and transmitting the message packet downstream along the actual topological relation of the line to form a power supply path and direction of the power supply.
1.2 determining the remaining capacities of the Main Power supply and the Standby Power supply
When the message packet reaches the interconnection switch, the message packet is automatically converted into a standby power supply and is continuously transmitted, and finally, the residual capacity of the power supply can be obtained at all the switches of the main power supply and the standby power supply in the whole network.
1.3 the electrical distance between each switch and the power supply, expressed in the number of switches between the corresponding switch and the switch on the power supply path and between the switch and the power supply point.
The control switch id of the power supply is adopted to represent the power supply id; the power supply electrical distance is initialized to 0 and the electrical distance is automatically incremented by 1 for each message passing through a node. The smaller the electrical distance of the power supply, the closer to the control switch of the power supply, and vice versa. Electrically adjacent switches whose difference in electrical distance from the power supply to the same power supply point is not greater than 1.
1.4, forming the calculated result into the attribute of the switch, wherein each area enclosed by the switches with the electrical distance of 0 is a switch section;
and forming the calculated result into the attribute of the switch on the circuit, wherein the attribute comprises the power supply path, the main power supply, the standby power supply, the electrical distance between the switch and the power supply and the like, and each area enclosed by the switches with the electrical distance of 0 forms a switch section.
Step two: dividing the switch section state and establishing a fault occurrence and state conversion mechanism before and after processing, which comprises the following specific steps:
according to the state change rule of the switch section before and after the fault occurs and is processed, the states of the switch section are divided into a normal state, a fault state, a to-be-recovered state and a power failure state. The 'normal' and 'power failure' are two stable states, and the 'failure' and 'to-be-recovered' states are two unstable states, and after failure processing is finished, the states are changed into the 'normal' and 'power failure' states. When the power distribution network operates normally, the states of all the sections with points are initialized to be normal, and the state of the section without power is initialized to be power failure.
As shown in fig. 1, it is a schematic structural diagram of a switching section state transition mechanism, and the specific transition mechanism is as follows:
[1] when the distribution network suffers permanent faults, the fault section state becomes 'fault', and fault location is to discriminate which section state is 'fault';
[2] the fault downstream section which has power failure due to fault isolation is converted into a section to be recovered;
[3] if the fault isolation is successful, the 'fault' section is converted into a 'power failure' section;
[4] if the fault isolation fails, the 'power-off' sections are expanded, and some 'to-be-recovered' sections are dyed into 'fault' sections;
[5] after fault isolation is completed, the ad hoc network system automatically restores power supply service for the section to be restored. If the operation is successful, the section to be recovered is converted into a normal section;
[6] if the power supply is failed to be recovered, the corresponding section to be recovered is converted into a power failure section;
[7] only after the fault is removed and the power supply of the 'power-off' section is restored automatically or manually, the section state can be changed from 'power-off' to 'normal'.
Step three: fault location is performed based on the switch section, specifically as follows:
3.1 if only one of the switches around a switch segment has a fault flag set, then the segment is a "fault" segment;
3.2 if the section of the switch around the section of one switch, in which more than or equal to two switches have fault current, is a fault upstream section, and the section without any switch having fault current is a fault downstream section;
3.3 among the switches that make up the "fault" status section, the switch with the smaller electrical distance is the upstream switch of the fault, otherwise the downstream switch of the fault.
Step four: and carrying out fault isolation and power supply recovery of a non-fault area according to the fault positioning result.
The switch around the fault section is activated to open the switch;
and once the switch data service instance executing the isolation operation is monitored to be successfully opened, the message is immediately sent to other adjacent switches in the section to be recovered, and the control switch id is selected according to the power supply recovery strategy at the switch. If any recovery strategy cannot be found, the id is set to be 0;
in the set time, the switch is still not opened, and a message is also sent to other switches in the section to be recovered, and the switch id is controlled to take the value of 0;
one switch which is switched on receives the message, and the content of the message is more than 0, then the message is immediately forwarded at the other end; if the message content is equal to 0, which indicates that the adjacent switch fails to be isolated or no standby power supply exists due to insufficient residual capacity, the message source section is set as a 'failure' section, and the switch is switched to the operation of opening the switch. This achieves the goal of properly expanding the isolation region to recover power as much as possible;
when the contact switch in the closing preparation state receives the message, comparing the id of the switch with the id in the message, and if the id is equal to the id in the message, executing closing operation by the switch;
and if the set time passes, the communication switch in the preparation for closing does not receive the signal equal to the id of the communication switch, and the preparation for closing is released.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (5)
1. The distributed feeder automation distribution line topology ad hoc network method is characterized by comprising the following steps:
establishing a switch section, dividing the state of the switch section, and establishing a state conversion mechanism before and after the occurrence and the processing of the fault;
fault location is carried out based on the switch section, and fault isolation and power supply recovery of a non-fault area are carried out according to a fault location result;
the specific method for establishing the switch section comprises the following steps:
1.1 determining a power supply path and a direction of each power supply point;
1.2 determining the residual capacities of the main power supply and the standby power supply;
1.3 the electrical distance between each switch and the power supply point is represented by the number of the switches between the corresponding switches and the power supply point on the power supply path;
1.4 determine the switch sections as the areas enclosed between the switches with the electrical distance 0.
2. The distributed feeder automation distribution line topology ad hoc networking method of claim 1, wherein the switch segment status comprises: two stable states of 'normal' and 'power failure' and two unstable states of 'failure' and 'to be recovered'.
3. The distributed feeder automation distribution line topology ad hoc networking method according to claim 2, wherein the state transition mechanism is specifically as follows:
when the distribution line suffers permanent fault, the switch section converts the 'normal' state into the 'fault' state, and if the fault isolation is successful, the 'fault' section is converted into the 'power failure' section;
the fault downstream power failure section which causes power failure due to fault isolation is converted into a section to be recovered;
after the fault isolation is finished, the section to be recovered restores the power supply service, and if the power supply is restored successfully, the section to be recovered is converted into a normal section;
the fault is cleared and the "dead" section is automatically or manually restored to power, the section status transitions from "dead" to "normal".
4. The distributed feeder automation distribution line topology ad hoc network method according to claim 2, wherein a specific method of fault location is as follows:
a "failed" segment if only one of the switches surrounding the segment is set to the failed flag;
if the section which is greater than or equal to two switches around one switch section and has fault current is a fault upstream section; the section without any switch with fault current is a fault downstream section, namely a section to be recovered;
among the switches that make up the "fault" status segment, the switch that is the smallest electrical distance from the power source is the upstream switch of the fault, otherwise the downstream switch of the fault.
5. The distributed feeder automation distribution line topology ad hoc network method according to claim 2, wherein the method of fault isolation and non-fault area power supply restoration is as follows:
tripping all switches forming a fault section, carrying out fault isolation, and recording normal load before isolation;
and starting a closing preparation for the interconnection switch of the section to be recovered, if the load of the section to be recovered is smaller than the residual capacity of the standby power supply, executing closing by the closing preparation, and otherwise, canceling the closing preparation.
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| CN105514951A (en) * | 2015-11-27 | 2016-04-20 | 国家电网公司 | Open-communication-realization-based distributed feeder automatic decision-making method |
| CN107800121A (en) * | 2016-09-07 | 2018-03-13 | 南京南瑞继保电气有限公司 | A kind of Distributed power line protection method |
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| CN102354977B (en) * | 2011-10-20 | 2013-04-03 | 湖南省电力公司科学研究院 | Feeder fault handling method |
| CN103166203A (en) * | 2011-12-14 | 2013-06-19 | 南京南瑞继保电气有限公司 | Distribution network topology guard method with direction |
| CN102611086B (en) * | 2012-03-27 | 2015-01-07 | 许继电气股份有限公司 | Centralized protection system and method for region distribution network |
| CN102882195A (en) * | 2012-10-24 | 2013-01-16 | 江苏省电力公司扬州供电公司 | Intelligent longitudinally-interconnected feeder automation system |
| EP2933891B1 (en) * | 2014-04-17 | 2022-08-17 | Hitachi Energy Switzerland AG | Load restoration in a high or medium voltage substation |
| CN104113141B (en) * | 2014-07-30 | 2016-06-22 | 国网电力科学研究院 | A kind of intelligence longitudinally interconnects feeder automation control method |
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| CN102707198A (en) * | 2012-06-21 | 2012-10-03 | 冀北电力有限公司张家口供电公司 | Feeder automation failure positioning method based on failure backcasting |
| CN105514951A (en) * | 2015-11-27 | 2016-04-20 | 国家电网公司 | Open-communication-realization-based distributed feeder automatic decision-making method |
| CN107800121A (en) * | 2016-09-07 | 2018-03-13 | 南京南瑞继保电气有限公司 | A kind of Distributed power line protection method |
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