CN110165639B - Method for automatically switching working modes of power distribution terminal - Google Patents
Method for automatically switching working modes of power distribution terminal Download PDFInfo
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- CN110165639B CN110165639B CN201910372196.XA CN201910372196A CN110165639B CN 110165639 B CN110165639 B CN 110165639B CN 201910372196 A CN201910372196 A CN 201910372196A CN 110165639 B CN110165639 B CN 110165639B
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- 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
- H02H7/261—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 involving signal transmission between at least two stations
Abstract
A method for automatically switching working modes of a power distribution terminal is realized based on the power distribution terminal in a power distribution network, belongs to the technical field of power distribution automation in a power system, is used for detecting power grid faults, and particularly relates to automatic switching of the working modes of the power distribution terminal. The method comprises the steps that a default operation mode and a standby operation mode are built in a power distribution terminal, the power distribution terminal sends a goose frame every T1, when the power distribution terminal operates in the default mode, if information sent by other terminals is not received within the time of 2X T1 or 3X T1, the power distribution terminal is switched to the standby operation mode, and when the power distribution terminal operates in the standby operation mode, if information sent by other terminals is received, the power distribution terminal is switched to the default operation mode. Under normal conditions, the equipment runs in an intelligent distributed FA working mode. When the power distribution terminal judges the communication fault, the power distribution terminal is automatically switched to a local feeder automatic sectional mode or a contact mode, and the risk of the intelligent distributed FA over relying on communication to cause a protection blank period is reduced.
Description
Technical Field
The invention belongs to the technical field of distribution automation in an electric power system, and relates to the field of detection of power grid faults, in particular to automatic switching of working modes of a distribution terminal.
Background
In the operation process of the intelligent distributed FA, if the communication faults of the whole line such as optical fiber disconnection, exchanger fault and the like occur in the power system, the intelligent distributed FA is based on the protection of communication, and cannot receive the working state information of upstream and downstream equipment after the communication faults occur. When an overcurrent fault occurs, the switch will not operate under any condition because the fault state of the adjacent equipment, usually the latch FA, cannot be judged. At this time, the whole line loses all protection, and any place on the whole line has a fault, so that the fault can be removed only by tripping an outlet of a transformer substation, and the high-quality power supply requirement of isolating the fault place and recovering power supply in a non-fault area cannot be met.
The local operation mode of the power distribution terminal is suitable for an area without reliable communication conditions or an area without communication conditions between the main station and the terminal, and the intelligent distributed FA mode and the local operation mode are switched under appropriate conditions, so that the problems can be solved. At present, no disclosure of related art is seen.
Disclosure of Invention
The invention provides the method for judging and isolating the fault point of the power distribution terminal under the condition that local communication or all communication has faults.
Therefore, the technical scheme of the invention is as follows: a method for automatically switching working modes of a power distribution terminal is realized based on the power distribution terminal in a power distribution network, and the power distribution terminal is internally provided with three operation modes which are an intelligent distributed FA mode, an in-place feeder automatic segmentation mode and an in-place feeder automatic contact mode.
Before commissioning, the intelligent distributed FA mode is set as a default operation mode, and the local feeder automation subsection mode or the local feeder automation contact mode is set as a standby operation mode.
When the power distribution terminal operates in a default operation mode, the power distribution terminal receives overcurrent fault information of adjacent terminals to perform fault judgment; the distribution terminal transmits a goose frame every T1.
When the power distribution terminal operates in the default mode, if the information sent by other terminals is not received within the time of 2 × T1 or 3 × T1, the standby operation mode is switched.
When the power distribution terminal operates in the standby operation mode, if the information sent by other terminals is received, the default operation mode is switched.
The intelligent distributed FA mode depends on the smooth communication of the whole network to complete the judgment and isolation of fault points, and the local feeder automation mode, especially the recloser feeder automation mode is suitable for the areas without reliable communication conditions or communication conditions between the main station and the terminal. The local feeder line section mode and the local feeder line contact mode are suitable for the situation that reliable communication conditions do not exist between the main station and the terminal.
The power distribution terminal judges whether the communication itself is failed or not by transmitting and receiving the goose frame. Further, the power distribution terminal receives all the goose frames, and if the goose frames sent by a certain terminal are not received within a period of time, the terminal is judged to have communication faults.
Under the condition of good communication of the power distribution network, the power distribution terminal operates in an intelligent distributed FA mode, and fault points are effectively judged and isolated; when partial or all communication faults occur, the power distribution terminal is switched to a standby operation mode, and isolation and protection of fault points are completed.
By adopting the invention, under the normal condition, the equipment runs in the intelligent distributed FA working mode. When the distribution terminal judges the communication fault, the distribution terminal is automatically switched to a local feeder line automatic sectional mode or a contact mode, the secondary coincidence of a transformer substation can be achieved according to the sectional mode or the contact mode to isolate a fault area, the power supply of a non-fault area is recovered, the normal power supply of most non-fault lines is guaranteed, and the risk of the intelligent distributed FA in a protection blank period caused by too relying on communication is reduced.
Drawings
Figures 1-3 are power supply network topologies.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Each distribution terminal is provided with a switch, which is controlled by the distribution terminal and the status (including fault information) of which is uploaded through the distribution terminal. For convenience of description, only the switches are shown in the drawings and the power distribution terminals are not shown. In the embodiments presented below, each switch corresponds to a power distribution terminal. There are three types of power distribution terminals used in the field: 1. the method only has an operation parameter acquisition function (monitoring), 2, control (monitoring) is added on the acquisition function, and 3, protection is integrated into a power distribution terminal (comprehensive protection and monitoring). The following example is directed to a type 3 power distribution terminal.
A method for automatically switching working modes of a power distribution terminal is realized based on the power distribution terminal in a power distribution network.
In the power distribution terminal, three working mode programs are written, namely an intelligent distributed FA mode, an in-place feeder automation subsection mode and an in-place feeder automation connection mode.
The use of the intelligent distributed FA provides reliable support for rapidly isolating faults and recovering power supply, greatly improves the power supply reliability and the fault processing efficiency, shortens the power failure time, and improves the social benefit and the service level. Under normal conditions, the distribution terminals in the distribution network operate in this mode.
Before commissioning, the intelligent distributed FA mode is set as a default operation mode, and the local feeder automation subsection mode or the local feeder automation contact mode is set as a standby operation mode.
The power distribution terminal determines the standby operation mode according to the position and the action of the power distribution terminal in the power grid, as shown in fig. 1, the FTU4 is located at the position of a contact node of two power supply points A, B, and the standby operation mode of the power distribution terminal at the position is an in-situ feeder automation contact mode; and the standby operation mode is a local feeder automation subsection mode at the power distribution terminals at the positions of FTU1, FTU2, FTU3, FTU5 and FTU 6.
And when the power distribution terminal operates in a default operation mode, the power distribution terminal receives overcurrent fault information of the adjacent terminal to judge the fault. The state is the conventional working state of the power distribution network, when the power distribution network has a fault, fault information is sent, and meanwhile overcurrent fault information of other terminals is received for fault judgment and isolation.
The power distribution terminal sends a goose frame every 5 seconds, so that other terminals can judge whether the communication is smooth or not.
When the power distribution terminal operates in the default mode, if the information sent by other terminals is not received within 10-15 seconds, the standby operation mode is switched to.
All terminals send goose frames every T1, here 5 seconds, and if a terminal does not receive any information for a while, it is determined that a communication failure occurs in itself. If the fault information of other terminals cannot be received, the basis for judging the operation of the intelligent distributed FA mode is absent, and at the moment, the power distribution terminal is switched to an in-situ feeder automatic subsection mode or an in-situ feeder automatic contact mode. If the switch fails, all terminals in the power grid cannot receive information of other terminals, and all terminals are switched to an on-site feeder automation subsection mode or an on-site feeder automation contact mode.
When the power distribution terminal operates in the standby operation mode, if the information sent by other terminals is received, the communication of the power distribution terminal is recovered, and the power distribution terminal is switched to the default operation mode.
When the terminal is in normal operation, the FTU1-FTU6 operates in an intelligent distributed FA mode, the power distribution terminals externally send goose frames every 5s, and each power distribution terminal can receive the goose frames of other terminals every 5 s. When a fault occurs, according to the logic of the intelligent distributed FA, the upstream switch and the downstream switch of the fault point are tripped to isolate the fault, and then the non-fault area is communicated and recovered to supply power.
When the optical fiber is broken, communication fault of a certain terminal can be caused; when the switch fails, all terminals do not receive goose frames of other terminals within 10s-15s, the terminals are respectively judged to have communication failure, then the terminals are automatically switched to a standby operation mode, FTU1-FTU3, FTU5 and FTU6 are switched to a local feeder line segmentation mode, and equipment FTU4 is switched to a contact mode.
FTU1-FTU3, FTU5, FTU6, feeder automation section mode incoming telegram combined floodgate time is 7s, FTU4 feeder automation contact mode lost telegram combined floodgate time is 15 s.
Example 1.
A short circuit fault occurs between FTU2 and FTU3 in fig. 1.
The line normally runs, FTUs 1-6 all run in an intelligent distributed FA mode, each device externally sends goose frames every 5s when the communication is normal, if a fault occurs at a fault mark in the diagram 1, FTU1 and FTU2 report the fault frames externally, according to protection logic of intelligent distributed FA, after comprehensive information of FTU2, only one side of the FTU is found to be faulty, and the other side of the FTU is not faulty, the control switch trips, FTU3 receives fault information sent by FTU2, only one side of the FTU is found to be faulty, and the other side of the FTU is not faulty, so that the switch is tripped, FTU2 and FTU3 trip switches, after the fault is isolated, an isolation success message is sent, after an interconnection switch receives the isolation success message sent by FTU2 and FTU3, the control switch is switched on, and power supply of a non-fault area between FTU3 and FTU4 is.
When a switch failure occurs, because the terminal is switched to a local feeder automation mode, the substation A is tripped out to isolate the failure, the FTU1-FTU3 works in a feeder automation subsection mode, and the switch is tripped due to the loss of voltage and the opening of two sides; then, the outgoing line of the transformer substation A is coincided for the first time, the FTU1 is switched on after single-side power-on delay, then the FTU2 is switched on after single-side power-on delay, the FTU2 is in failure due to the fact that a failure point is located at the downstream of the FTU2, the outgoing line of the transformer substation A is tripped again to isolate the failure, at the moment, the FTU2 is switched on in a forward incoming call due to Y time limit locking, and the FTU3 is switched on in a reverse incoming call due to X time limit; then, the outgoing line of the transformer substation A is subjected to secondary coincidence, the FTU1 is switched on in a delayed manner after the single side is electrified, and the FTU2 cannot be switched on due to positive locking when the single side is electrified; FTU4 operates in feeder automation contact mode, because both sides have, becomes unilateral decompression after transformer substation A trips for the first time, closes a floodgate after the time delay, resumes the power supply between FTU3 and FTU4, and FTU3 unilateral gets to be electrified owing to be in reverse shutting state, can not come the floodgate.
If the switch is cleared, the communication between the terminals is recovered, normal communication is recovered after the goose frames of other terminals are received, the equipment is automatically switched to a default operation mode, and isolation and transfer are performed according to intelligent distributed FA logic when a fault occurs.
If the number of the power distribution terminals with communication faults is larger than the number of the switch faults, the fault positioning function through the intelligent FA has the problem of inaccurate positioning or incapability of positioning, and the advantage of quick positioning of the intelligent FA is lost. Experience has shown that this occurs when the on-line (keep communicating) rate of the distribution terminals is below 70%.
According to the method for processing the situation, when the online rate of the power distribution terminal is lower than 70%, the whole line is directly switched into a local feeder mode, and fault location is realized through 2 reclosings at an outlet of a transformer substation according to the local feeder mode.
To this end, each distribution terminal needs to know the communication conditions of all the distribution terminals in the power supply network. In the invention, the power distribution terminal receives the goose frames sent by all other terminals, and if the goose frames sent by a certain terminal are not received within 10s or 15s, the power distribution terminal judges that the communication fault occurs in the terminal.
The power distribution terminal can judge the communication fault condition of all power distribution terminals (including the power distribution terminal) in the power supply network within 10s or 15 s. And when the power distribution terminal operating in the default mode judges that the number of the terminals with communication faults in the power distribution network is more than 30%, the power distribution terminal is switched to the standby operation mode.
All the power distribution terminals carry out the judgment, and can be uniformly converted into the standby operation mode under the same condition.
Example 2.
In fig. 2, it is assumed that a communication fault occurs in FTUs 5 and 6, when an overcurrent fault occurs between FTU5 and FTU6, the power distribution terminals at the positions of FTU5 and FTU6 are switched to the local mode, and since the communication fault cannot locate a fault point, after FTUs 5 and FTU6 are closed by locking after a substation B2 times of coincidence, a contact FTU4 cannot be supplied due to being in the FA mode.
According to the method, 6 power distribution terminals are provided, 2 power distribution terminals have communication faults, the goose frames sent by FTU5 and FTU6 cannot be received by FTU1, FTU2, FTU3 and FTU4, and the communication faults of FTU5 and FTU6 are judged, wherein the online rate 4/6 is less than 70 percent, or the number of terminals with communication faults 2/6 is more than 30 percent; FTU5 and FTU6 can not receive goose frames of all power distribution terminals and judge that communication faults occur; FTU1-FTU6 all can switch to local mode, and after 2 reclosures in transformer substation, FTU5 closes with FTU6 shutting combined floodgate, contacts FTU4 closing and resumes the non-fault area power supply.
And after the power distribution terminal is switched into the standby operation mode, the power distribution terminal still receives the goose frame all the time and judges the network communication condition. And when the communication condition is improved, the power distribution terminal is switched to a default operation mode. Namely: when the power distribution terminal operates in the standby operation mode, if the information sent by other terminals is received and the number of the terminals with communication faults in the power distribution network is judged to be less than or equal to 30%, the power distribution terminal is switched to the default operation mode. In the above embodiment, if FTU5 resumes communication, FTU1, FTU2, FTU3, FTU4 and FTU5 cannot receive goose frames transmitted by FTU6, and FTU1, FTU2, FTU3, FTU4 and FTU5 switch to the default operation mode.
When the power distribution terminal operates in a default operation mode, a fault point needs to be judged and isolated by means of fault information of adjacent terminals. And when the adjacent power distribution terminals have communication faults and fail to send fault information, receiving the fault information of the terminal on one side of the communication fault terminal, which is closest to the communication fault terminal, and judging.
In the invention, when the power distribution terminal operates in a default mode, if the power distribution terminal has an overcurrent fault or receives overcurrent fault information of other power distribution terminals, the adjacent power distribution terminal is judged to have a communication fault and does not receive the overcurrent fault information of the adjacent power distribution terminal, and the information of the power distribution terminal closest to the power distribution terminal on one side of the power distribution terminal is received for judgment.
Here, the overcurrent fault information of other distribution terminals is collected, and there are two conditions:
1. it has been determined that a communication fault has occurred with an adjacent power distribution terminal.
2. No overcurrent fault information is received from an adjacent distribution terminal.
The reason for this determination is: when there is no communication fault, there may be no overcurrent fault; when overcurrent faults occur in the conventional power distribution terminal with communication faults, communication is recovered, and fault information can be sent out.
Example 3.
In fig. 1, when the optical fiber is disconnected, and the FTU2 fails to receive goose frames of adjacent devices due to the optical fiber being disconnected, it is determined that the communication failure is automatically switched to the feeder automation section mode after 10 s. If the fault occurs at the fault position marked in the graph 1, FTU2 cannot send fault information outwards due to communication fault, FTU1 sends fault information outwards, due to the communication fault of FTU2, FTU1 collects the information of FTU3 of FTU2 side closest to FTU2, FTU1 finds that only self fault is not detected on the other side, judges that the fault is in the adjacent position, and trips, and FTU3 is in communication fault due to FTU2, collects the information of FTU1 of FTU2 side closest to FTU2, and due to the fact that one side of fault is not detected on one side, trips, and FTU2 is subjected to voltage-loss brake-separating on two sides in an automatic feeder section mode. The FTU4 is switched on after receiving the fault isolation success message, power supply of a non-fault area between the FTU3 and the FTU4 is recovered, at the moment, the FTU1, the FTU2 and the FTU3 on a circuit are tripped to isolate the fault, the fault area is divided into two parts, and the fault area is easy to find.
In practical applications, it is possible that communication faults occur at a certain side of the power distribution terminals and all the power distribution terminals are in communication faults, and no fault information can be referred to at the certain side. In the present invention, in this case, the power distribution terminal is switched to the standby operation mode.
Example 4.
In fig. 3, FTU4 is shown at the contact node location of two power points where the standby mode of operation of the power distribution terminal is in local feeder automation contact mode; and the standby operation mode is a local feeder automation subsection mode at the power distribution terminals at the positions of FTU0, FTU1, FTU2, FTU3, FTU5 and FTU 6.
An overcurrent fault occurs at the identified location in the diagram, between FTU2 and FTU 3. Communication faults occur to the FTUs 0 and 1.
At this time, FTU2-FTU6 operates in a default mode, and FTU0 and FTU1 have overcurrent but have communication faults and cannot send overcurrent fault information; FTU2 sends overcurrent information, and FTU3 receives the overcurrent information of FTU2 for judgment; on one side of FTU2, both FTU1 and FTU0 are experiencing communication failures, and therefore, FTU2 switches to a standby mode of operation.
And the power distribution terminal uploads the information of other power distribution terminals with the communication faults to be referred by maintenance personnel.
No matter which operation mode the power distribution terminal works in, the power distribution terminal sends goose frames every 5 s; and when the power distribution terminal has an overcurrent fault, sending an overcurrent fault information frame. The reason for this is: when the power distribution terminal operates in the standby operation mode, although the power distribution terminal does not receive the goose frames of other terminals and switches to the default operation mode, the goose frames are transmitted at a time interval (5 seconds), during the period that the other terminals transmit the two goose frames, the communication of the power distribution terminal is possibly recovered, and the other terminals can receive the transmitted information at the time, so that a basis is provided for judging the communication state or judging the fault. Later, the power distribution terminal can receive the goose frames sent by other terminals and switch the standby operation mode to the default operation mode.
Claims (7)
1. A method for automatically switching working modes of a power distribution terminal is realized based on the power distribution terminal in a power distribution network and is characterized in that the power distribution terminal is internally provided with three operation modes which are an intelligent distributed FA mode, an in-place feeder automatic subsection mode and an in-place feeder automatic connection mode,
before the distribution terminal is put into operation, the intelligent distributed FA mode is set as a default operation mode, the local feeder automation subsection mode or the local feeder automation connection mode is set as a standby operation mode,
the distribution terminal transmits a goose frame every T1,
when the power distribution terminal operates in the default mode, if the information sent by other terminals is not received within the time of 2T 1 or 3T 1, the standby operation mode is switched,
when the power distribution terminal operates in a standby operation mode, if information sent by other terminals is received, switching to a default operation mode;
the standby operation mode of the power distribution terminals at the contact nodes is an in-situ feeder automation contact mode, and the standby operation mode of the power distribution terminals at other positions is an in-situ feeder automation section mode;
the power distribution terminal receives the goose frames sent by all other terminals, and if the goose frames sent by a certain terminal are not received within the time of 2T 1 or 3T 1, the fact that the terminal has a communication fault is judged;
and when the power distribution terminal operating in the default mode judges that the number of the terminals with communication faults in the power distribution network is more than 30%, the power distribution terminal is switched to the standby operation mode.
2. The method of claim 1, wherein when the power distribution terminal operates in the standby operation mode, if the information transmitted by other terminals is received and the number of terminals with communication failure in the power distribution network is determined to be less than or equal to 30%, the power distribution terminal is switched to the default operation mode.
3. The method of claim 1, wherein when the power distribution terminal operates in a default mode, if it is determined that a communication fault occurs in an adjacent power distribution terminal and no overcurrent fault information is received from the adjacent power distribution terminal if an overcurrent fault occurs in itself or overcurrent fault information is received from other power distribution terminals, the information of the power distribution terminal closest to the power distribution terminal on one side of the power distribution terminal is received for determination.
4. The method of claim 3, wherein when the power distribution terminal operates in the default mode, if it is determined that all power distribution terminals of a certain side have communication faults and have not received overcurrent fault information of the terminal of the certain side if it has overcurrent fault or overcurrent fault information of other power distribution terminals is received, the operation mode is switched to the standby operation mode.
5. The method of claim 1, wherein the power distribution terminal uploads power distribution terminal information indicating the communication failure.
6. The method of claim 1, wherein the overcurrent fault information frame is transmitted when an overcurrent fault occurs at the power distribution terminal regardless of the operating mode in which the power distribution terminal is operating.
7. The method of claim 1, wherein T1 is 5 seconds.
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| CN110912075A (en) * | 2019-11-15 | 2020-03-24 | 国网浙江省电力有限公司 | Integrated feeder terminal and distributed feeder automation method thereof |
| CN111711965B (en) * | 2020-08-20 | 2020-12-01 | 南京智汇电力技术有限公司 | Intelligent distributed FA fault positioning method based on wireless communication |
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| CN102185300A (en) * | 2011-05-24 | 2011-09-14 | 安徽中兴继远信息技术有限公司 | On-spot feeder automation equipment and realizing method thereof |
| CN104242456A (en) * | 2014-09-26 | 2014-12-24 | 国家电网公司 | Feeder automation method and feeder automation system for power distribution network |
| CN104269812A (en) * | 2014-10-23 | 2015-01-07 | 南京国电南自轨道交通工程有限公司 | Digital protection communication interruption detection method applicable to metro medium-voltage power supply system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8121740B2 (en) * | 2008-12-18 | 2012-02-21 | Abb Research Ltd. | Feeder automation for an electric power distribution system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102185300A (en) * | 2011-05-24 | 2011-09-14 | 安徽中兴继远信息技术有限公司 | On-spot feeder automation equipment and realizing method thereof |
| CN104242456A (en) * | 2014-09-26 | 2014-12-24 | 国家电网公司 | Feeder automation method and feeder automation system for power distribution network |
| CN104269812A (en) * | 2014-10-23 | 2015-01-07 | 南京国电南自轨道交通工程有限公司 | Digital protection communication interruption detection method applicable to metro medium-voltage power supply system |
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