CN111585340B - Main power distribution network single-phase grounding pull-out auxiliary decision-making method based on multi-source data - Google Patents
Main power distribution network single-phase grounding pull-out auxiliary decision-making method based on multi-source data Download PDFInfo
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- Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses
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Abstract
The invention discloses a main power distribution network single-phase grounding pull-out auxiliary decision method based on multi-source data, which comprises the steps of obtaining single-phase grounding starting criteria; acquiring real-time data of a main network and a bus in a distribution network, and judging whether the single-phase grounding starting criterion is met; when the single-phase grounding starting criterion is met and the single-phase grounding starting criterion is met within a set time range, the bus is judged to be in single-phase grounding; when the bus is judged to be single-phase grounded and a device corresponding to a feeder line connected with the bus does not have a wave recording function, screening out a suspicious grounded line from main network data; forming a pull strategy table based on the pull sequence table, the suspicious grounding circuit and the pull strategy; and forming a control strategy table based on the route pulling strategy table, and completing manual or automatic route pulling based on the control strategy table. The method provides powerful help for the distribution and dispatching monitoring personnel to quickly acquire the single-phase grounding bus, the single-phase grounding line and the single-phase grounding feeder section, and the distribution and dispatching personnel can immediately adopt treatment measures to isolate faults or try to pull according to the auxiliary decision of the single-phase grounding pull.
Description
Technical Field
The invention belongs to the field of comprehensive treatment of power system ground faults by comprehensively utilizing various information by a dispatching/distribution network main station, and particularly relates to a main distribution network single-phase ground pull auxiliary decision-making method based on multi-source data.
Background
When the small current grounding system is in single-phase grounding, the fault phase-to-ground voltage is reduced, and the fault phase-to-ground voltage is not two-phaseThe phase voltage rises, but the line voltage is still symmetrical, so that the continuous power supply to users is not influenced, and the system can run for 1-2 h. However, if the power grid runs for a long time when single-phase earth fault occurs, the non-fault two-phase earth-to-ground voltage rises
And insulating weak links are broken down possibly to develop into interphase short circuit, so that accidents are enlarged, normal power utilization of users is influenced, and more importantly, life safety is possibly threatened. Therefore, when a single-phase earth fault occurs, the fault line must be found in time to be cut off. At present, although each local power grid company builds a main network dispatching automation system and a distribution network dispatching automation system or a main distribution integrated automation system, data sources which can be effectively utilized when the power grid is in single-phase grounding are greatly different, and the accuracy and the effect of single-phase grounding judgment are also different.
Disclosure of Invention
In order to solve the problem of difference of single-phase grounding positioning of different data sources, the invention provides a multi-source data-based main power distribution network single-phase grounding pull-out auxiliary decision method, which can flexibly assemble data of a main system and a distribution secondary system based on scenes, realize logic AND/or non-configuration of single-phase grounding starting criteria, send a single-phase grounding alarm function after meeting the single-phase grounding starting criteria, provide a line selection function and a segment selection function according to the source condition of the data, provide a pull-out strategy and a control strategy, and perform one-key remote control or closed-loop control. Powerful technical support is provided for distribution and dispatching monitoring personnel, and the fault handling capacity of the distribution and dispatching monitoring personnel after the power grid accident is improved.
The technical purpose is achieved, the technical effect is achieved, and the invention is realized through the following technical scheme:
a main power distribution network single-phase grounding pull-through auxiliary decision-making method based on multi-source data comprises the following steps:
acquiring single-phase grounding starting criterion;
acquiring real-time data of buses in a main network and a distribution network, and judging whether single-phase grounding starting criteria are met or not;
when the judgment result shows that the single-phase grounding starting criterion is met and the single-phase grounding starting criterion is always met within a set time range, the bus is judged to be in single-phase grounding;
when the bus is judged to be single-phase grounded and a device corresponding to a feeder line connected with the bus does not have a wave recording function, screening out a suspicious grounded line from main network data;
forming a pull strategy table based on the pull sequence table, the suspicious grounding circuit and the pull strategy;
and forming a control strategy table based on the pull strategy table, and finishing manual or automatic pull based on the control strategy table.
Preferably, when it is determined that the single-phase grounding start criterion is met and the single-phase grounding start criterion is met within the set time range, the step of determining that the single-phase grounding is met further includes:
if the single-phase grounding returns within the set time range, the single-phase grounding is judged to be non-single-phase grounding.
Preferably, the single-phase grounding return means that the single-phase grounding starting criterion is not met based on real-time data of the bus in the main network within a set time range.
Preferably, the main distribution network single-phase grounding pull-out auxiliary decision method based on multi-source data further includes:
when the bus is judged to be single-phase grounded, and the devices corresponding to the feeder line connected with the bus have the wave recording function, the devices sequentially call, analyze, record, analyze and position faults, and finally complete manual or automatic circuit pulling.
Preferably, the screening of the suspicious ground line by using the main network data specifically includes the following steps:
acquiring a grounding alarm signal in main network data;
and searching all the feeder lines corresponding to the switch intervals at the switching-on position connected with the grounding bus by using network topology based on the grounding alarm signal in the main network data, comparing the sudden change of the current after each feeder line is grounded with that before the grounding, and taking the maximum sudden change as a suspicious grounding line.
Preferably, the pull order bit table includes the pull order; the pull strategy comprises pull priority;
the pull strategy table comprises a plurality of suspicious grounding lines of the ordered paths to be pulled.
Preferably, the control policy table includes a plurality of switch intervals corresponding to suspicious ground lines in the pull policy table.
Preferably, the pull order in the pull order table is:
a. no-load (charging standby) lines;
b. the user has a line of standby power supply;
c. a line prone to failure;
d. lines of non-essential subscribers;
e. a long line;
f. short lines;
g. an important subscriber line.
Preferably, the sequence of each suspicious ground line in the pull strategy table can be manually adjusted; and each suspicious grounding line in the pull strategy table can be manually selected or deleted.
Preferably, the single-phase ground start criterion is logically and/or non-flexibly configured according to a scene.
Compared with the prior art, the invention has the following beneficial effects:
the main power distribution network single-phase grounding pull-out auxiliary decision method based on multi-source data provides powerful help for distribution and dispatching monitoring personnel to quickly acquire a single-phase grounding bus, a single-phase grounding line and a single-phase grounding feeder section, and the distribution and dispatching personnel can immediately take treatment measures to isolate faults or try to pull according to the single-phase grounding pull-out auxiliary decision; meanwhile, data such as fault starting criteria, fault waveforms and the like are provided for dispatching and monitoring personnel, and dispatching personnel can master the grounding condition very conveniently, rapidly and comprehensively, so that intelligent technical support is provided for the dispatching personnel to rapidly handle accidents. The invention can aim at the difference of the access service systems of the power grid companies of various regions without modifying the grounding judgment framework program, and has strong universality.
Drawings
Fig. 1 is a flowchart of a main distribution network single-phase grounding pull-way assistant decision method based on multi-source data according to an embodiment of the invention;
FIG. 2 is an exemplary diagram of a single-phase-grounded start-up criterion in accordance with one embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
The application of the principles of the present invention will now be described in detail with reference to the accompanying drawings.
Fig. 1 is a flowchart of a main distribution network single-phase ground pull-through auxiliary decision method based on multi-source data according to an embodiment of the present invention. The invention discloses a main power distribution network single-phase grounding pull-out auxiliary decision method based on multi-source data, which is used for carrying out single-phase grounding pull-out auxiliary decision based on scene comprehensive utilization of data of a main network scheduling automatic system and a distribution network scheduling automatic system or data of a main distribution integrated automatic system. The data of the main network dispatching automation system refer to a power grid model, a power grid graph, a power grid section, a power grid event and tag data of the main network dispatching automation system, and are mainly used for single-phase grounding starting criteria, line selection and route pulling auxiliary decision making. The data of the distribution network dispatching automation system refer to a power grid model, a power grid graph, a power grid section, a power grid event and recording waveform data of the distribution network dispatching automation system, and are mainly used for single-phase grounding starting criteria, section selection and route pulling auxiliary decision making.
As shown in fig. 1, a multi-source data-based main distribution network single-phase ground pull auxiliary decision method specifically includes the following steps:
the method comprises the following steps of (1) obtaining single-phase grounding starting criteria, wherein the single-phase grounding starting criteria are flexibly configured according to scenes;
the 10kV/35kV bus three-phase voltage (Ua/Ub/Uc) is used as a single-phase grounding starterCompared with other data sources, the dynamic criterion has high reliability and wide distribution range and can be used as a main criterion for single-phase grounding start, so that, as shown in fig. 2, in a specific embodiment of the invention, the single-phase grounding start criterion refers to the utilization of the zero-sequence voltage (3U) of a 10kV/35kV bus in a main network system0) 10kV/35kV bus three-phase voltage (U)a/Ub/Uc) The method comprises the following steps of performing single-phase grounding on a 10kV/35kV bus grounding alarm, a 10kV/35kV line grounding alarm, and a starting criterion of single-phase grounding by using a 'wave recording locking' or 'wave recording starting' signal in a distribution network system and then performing logical AND or non-combination of scenes; specifically, the following conditions were designed:
x1 denotes condition 1, wherein the condition 1 represents zero sequence voltage (3U) of a main network 10kV bus0)；
x2 denotes condition 2, which condition 2 represents the mains 10kV bus A-phase voltage (U)a)；
x3 denotes condition 3, which condition 3 represents the mains grid 10kV bus B-phase voltage (U)b)；
x4 denotes condition 4, which condition 4 represents the mains grid 10kV bus C-phase voltage (U)c)；
x5 represents a condition 5, wherein the condition 5 represents a grounding alarm action of the main network 10kV bus;
x6 represents condition 6, where condition 6 represents a "record lock" or "record start" signal action in the distribution network system,
therefore, the expression of the 10kV single-phase ground starting criterion is as follows:
x1>30||((x2<4.8&&x3>7.0&&x4>7.0)||(x2>7.0&&x3<4.8&&x4>7.0)||(x2>7.0&&x3>7.0&&x4<4.8))||x5||x6；
by analogy, the expression of the 35kV single-phase grounding starting criterion can be obtained as follows:
x1>30||((x2<16.0&&x3>24.5&&x4>24.5)||(x2>24.5&&x3<16.0&&x4>24.5)||(x2>24.5&&x3>24.5&&x4<16.0))||x5||x6。
as some main network dispatching systems are not connected with 10kV/35kV bus zero-sequence voltage(3U0) Or the reliability of the accessed data is not high without checking by the measuring point, so that the zero sequence voltage (3U) of the 10kV/35kV bus0) The single-phase grounding starting criterion can be flexibly configured according to scenes, namely, a user can define an expression of the single-phase grounding starting criterion;
similarly, the reliability of the data such as the grounding alarm of the 10kV/35kV bus, the grounding alarm of the 10kV/35kV line, the 'wave recording locking' or 'wave recording starting' of the distribution network system and the like is related to the actual dispatching system, and the data can be flexibly defined according to the scene when being used as the starting criterion. Namely, a user can define an expression of the single-phase grounding starting criterion;
such as: the 10kV single-phase grounding starting condition expression can be modified according to different actual field data acquisition reliability:
(x1>30&&((x2<4.8&&x3>7.0&&x4>7.0)||(x2>7.0&&x3<4.8&&x4>7.0)||(x2>7.0&&x3>7.0&&x4<4.8)))||(x5&&x6)
step (2) acquiring real-time data of a main network and a bus in a distribution network, and judging whether the single-phase grounding starting criterion is met; preferably, real-time data associated with a 10kV or 35kV bus in a main network and a distribution network are obtained, and whether a single-phase grounding starting criterion is met is judged;
step (3), when the condition that the single-phase grounding starting criterion is met is judged, and the single-phase grounding starting criterion is met all the time within a set time range (such as 1 minute), the bus is judged to be single-phase grounding, the set time range can be designed according to actual conditions, and the method is not specifically limited in the invention; if the single-phase grounding returns within the set time range, the single-phase grounding is judged to be non-single-phase grounding, only log recording is carried out, and the conditions of instantaneous single-phase grounding, remote measurement and remote signaling and other data instantaneous jitter can be effectively prevented; the single-phase grounding return means that the single-phase grounding return does not meet the single-phase grounding starting criterion based on the real-time data of the bus in the main network within a set time range;
step (4) when the bus is judged to be single-phase grounded and a device corresponding to the feeder line connected with the bus does not have a wave recording function, screening out a suspicious grounding line by using the main network data, namely, selecting sections by using the main network data;
in a specific embodiment of the present invention, the screening out a suspected grounding line by using the main network data specifically includes the following steps:
(4.1) acquiring a grounding alarm signal in the main network data;
and (4.2) searching all feeders corresponding to the switch intervals at the switching-on position connected with the grounding bus by using network topology based on the grounding alarm signal in the main network data, comparing the sudden change amount of the current after each feeder is grounded with that before the feeder is grounded, and taking the maximum sudden change amount as a suspicious grounding line.
Step 5, forming a pull strategy table based on the pull sequence table, the suspicious grounding line and the pull strategy;
the pull sequence bit table comprises a pull sequence, and the pull sequence in the pull sequence bit table is as follows:
a. no-load (charging standby) lines; b. the user has a circuit of a standby power supply; c. a line prone to failure; d. lines of non-essential subscribers; e. a long line; f. short circuit; g. an important subscriber line.
The pull strategy comprises pull priority;
the pull route strategy table comprises a plurality of suspicious grounding lines of the ordered routes to be pulled; the sequence of each suspicious grounding line in the pull strategy table can be manually adjusted; each suspicious grounding line in the pull strategy table can be manually selected or deleted;
step (6) forming a control strategy table based on the route pulling strategy table, and completing manual or automatic route pulling based on the control strategy table;
the control strategy table comprises a plurality of switch intervals corresponding to each suspicious grounding circuit in the pull strategy table.
In a specific embodiment of the present invention, the specific implementation procedures of the steps (5) and (6) are as follows:
based on the route pulling strategy, a user can decide whether to pull the route of each suspicious grounding line, all the choices in the route pulling strategy table are true under the default condition, and the user can click the choice radio box to make the choices unselected. The user can also adjust the order of single-phase ground pulling, click a certain record by a mouse, and click the buttons of up-shifting and down-shifting to adjust the pulling order. And finally, after the pull strategy is selected and adjusted, clicking a 'generation sequence' button, and automatically regenerating the objects and the sequence in the control strategy table. The pull way is divided into two wheels, the first wheel divides the 1 st switch according to the automatically generated pull way control strategy table, if the grounding disappears, the 1 st switch is just the grounding line, if the grounding continues, the 1 st switch is closed again at this time, the 2 nd switch is pulled, the following is analogized in turn, the grounding bus (at least 2 and above lines are grounded simultaneously) is not selected through the first wheel, the switches in the grounding sequence table are pulled simultaneously, the forward sequential closing is performed according to the reverse sequence, the line is the grounding line if the grounding is performed after the closing, and the following is analogized in turn. In the process of remote control execution, a remote control cancel button can be clicked to cancel the pull, and a remote control pause button and a remote control resume button are clicked to respectively pause automatic remote control and resume after pause.
And (7) when the bus is judged to be single-phase grounded and devices corresponding to the feeder line connected with the bus have a wave recording function, calling, recording, analyzing, recording and fault positioning are sequentially carried out, and manual or automatic pulling is finally completed.
The sequence of the step (7) and the steps (4) to (6) can be exchanged.
In summary, the following steps:
the main power distribution network single-phase grounding pull-out auxiliary decision method based on multi-source data provides powerful help for distribution and dispatching monitoring personnel to quickly acquire a single-phase grounding bus, a single-phase grounding line and a single-phase grounding feeder section, and the distribution and dispatching personnel can immediately take treatment measures to isolate faults or try to pull according to the single-phase grounding pull-out auxiliary decision; meanwhile, data such as fault starting criteria, fault waveforms and the like are provided for dispatching and monitoring personnel, the dispatching personnel can master the grounding situation very conveniently, rapidly and comprehensively, and intelligent technical support is provided for the dispatching personnel to rapidly handle accidents. The invention can aim at different access service systems of various local power grid companies without modifying the grounding judgment framework program, and has strong universality.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A main power distribution network single-phase grounding pull-way assistant decision-making method based on multi-source data is characterized by comprising the following steps:
acquiring single-phase grounding starting criterion;
acquiring real-time data of buses in a main network and a distribution network, and judging whether single-phase grounding starting criteria are met or not;
when the judgment result shows that the single-phase grounding starting criterion is met and the single-phase grounding starting criterion is always met within a set time range, the bus is judged to be in single-phase grounding;
when the bus is judged to be single-phase grounded and a device corresponding to a feeder line connected with the bus does not have a wave recording function, screening out a suspicious grounding line from main network data;
forming a pull strategy table based on the pull sequence table, the suspicious grounding circuit and the pull strategy;
forming a control strategy table based on the route pulling strategy table, and finishing manual or automatic route pulling based on the control strategy table;
when the single-phase grounding starting criterion is met and the single-phase grounding starting criterion is met within a set time range, the step of judging the single-phase grounding further comprises the following steps:
if the single-phase grounding returns within the set time range, the single-phase grounding is judged to be non-single-phase grounding;
the single-phase grounding return means that the single-phase grounding return does not meet the single-phase grounding starting criterion based on the real-time data of the bus in the main network within a set time range;
the auxiliary decision-making method for the single-phase grounding pull-out of the main power distribution network based on the multi-source data further comprises the following steps:
when the bus is judged to be single-phase grounded, and devices corresponding to the feeder line connected with the bus have a wave recording function, calling, analyzing, recording and fault positioning are sequentially carried out, and manual or automatic circuit pulling is finally completed;
the method for screening out the suspicious grounding circuit by using the main network data specifically comprises the following steps:
acquiring a grounding alarm signal in main network data;
based on the grounding alarm signal in the main network data, searching all the feeder lines corresponding to the switch intervals at the switching-on position connected with the grounding bus by using network topology, comparing the mutation amount of the current before grounding after each feeder line is grounded, and taking the maximum mutation amount as a suspicious grounding line;
the pull sequence bit table comprises the pull sequence; the pull strategy comprises pull priority;
the pull strategy table comprises a plurality of suspicious grounding lines of the ordered paths to be pulled.
2. The multi-source data-based auxiliary decision-making method for single-phase grounding pull of the main power distribution network according to claim 1, characterized in that: the control strategy table comprises a plurality of switch intervals corresponding to each suspicious grounding line in the pull strategy table.
3. The multi-source data-based auxiliary decision-making method for single-phase ground pulling of the main power distribution network according to claim 1, characterized in that: the pull sequence in the pull sequence table is as follows:
a. a no-load charging standby line;
b. the user has a line of standby power supply;
c. a line prone to failure;
d. lines of non-essential subscribers;
e. a long line;
f. short lines;
g. an important subscriber line.
4. The multi-source data-based auxiliary decision-making method for single-phase grounding pull of the main power distribution network according to claim 1, characterized in that: the sequence of each suspicious grounding line in the pull strategy table can be manually adjusted; and each suspicious grounding line in the pull strategy table can be manually selected or deleted.
5. The multi-source data-based auxiliary decision-making method for single-phase ground pulling of the main power distribution network according to claim 1, characterized in that: and the single-phase grounding starting criterion is logically AND/OR/non-flexibly configured according to a scene.
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