CN116593816B - Synchronous data fault positioning method for power distribution network - Google Patents
Synchronous data fault positioning method for power distribution network Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 claims abstract description 171
- 230000005611 electricity Effects 0.000 claims abstract description 55
- 238000005259 measurement Methods 0.000 claims abstract description 24
- 238000001514 detection method Methods 0.000 claims abstract description 23
- 230000002159 abnormal effect Effects 0.000 claims abstract description 15
- 238000012163 sequencing technique Methods 0.000 claims description 29
- 238000012216 screening Methods 0.000 claims description 27
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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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
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Abstract
The invention relates to the technical field of power grid fault positioning, in particular to a power distribution network synchronous data fault positioning method, which comprises the following steps of S1, calculating a real-time data fluctuation value; step S2, determining whether each power distribution end is abnormal or not through real-time data fluctuation values; s3, selecting a target user terminal set according to the real-time fluctuation ratio and the electricity consumption level; and S4, judging the number of the user terminals to perform fault distance measurement and positioning. According to the invention, abnormal determination is carried out by calculating the real-time data fluctuation value of the distribution terminals, monitoring is carried out on each distribution terminal in real time, the abnormal distribution terminal is locked, a target user terminal set of a corresponding grade is selected according to the real-time fluctuation ratio, non-fault user terminals are rapidly screened, fault location is carried out in sequence when the number of the positionable user terminals is reached, only one detection point is arranged in front of each distribution terminal, and a fault tester and a phasor measuring device are arranged behind the distribution terminals, so that efficient and accurate fault detection location in the distribution network range is realized.
Description
Technical Field
The invention relates to the technical field of power grid fault positioning, in particular to a power distribution network synchronous data fault positioning method.
Background
The distribution network is a power network which receives electric energy from a transmission network or a regional power plant, is distributed on site through a distribution facility or distributed to various users step by step according to voltage, and consists of an overhead line, a cable, a pole tower, a distribution transformer, a disconnecting switch, a reactive compensator, a plurality of auxiliary facilities and the like, wherein the network plays an important role in distributing the electric energy in the power network, and along with the realization of synchronous data acquisition in the distribution network, the synchronous data of the distribution network can synchronously acquire the related information of the distribution network, the dynamic state of the distribution network is monitored in real time, and fault positioning can be performed according to the synchronous data of the distribution network, so that the stable operation of the distribution network is ensured.
Chinese patent publication No.: CN109901022a discloses a power distribution network area positioning method based on synchronous measurement data; the technical point is to set a mu PMU monitoring point data abnormality judgment rule to locate a fault area, but because the existing power distribution system is huge in scale, only a small number of miniature synchronous phasor measurement units can be actually installed, so that the fault area is difficult to locate to a specific user side area, the existing fault area is low in locating precision, a large number of power maintenance personnel are still required to conduct field check, and stable operation of a power distribution network is not facilitated.
Disclosure of Invention
Therefore, the invention provides a method for positioning the synchronous data faults of a power distribution network, which is used for solving the problem that the fault positioning of the power distribution network is difficult to be accurate to a specific user side area in the prior art.
In order to achieve the above object, the present invention provides a method for locating a fault of synchronous data of a power distribution network, comprising,
step S1, setting detection points between a power plant end and each power distribution end, detecting real-time power distribution data of each power distribution end, and calculating the real-time power distribution data of each power distribution end through a monitoring end connected with each detection point to obtain a real-time data fluctuation value in unit monitoring duration;
step S2, setting a time standard fluctuation value matrix corresponding to each power distribution end in the monitoring end, selecting a corresponding standard power distribution fluctuation value in the time standard fluctuation value matrix according to the time information of the current moment, judging the real-time data fluctuation value according to the selected standard power distribution fluctuation value, and determining whether the real-time power distribution data of each power distribution end is abnormal or not;
step S3, when any power distribution terminal of the monitoring terminal has abnormality of real-time power distribution data, the monitoring terminal calculates the real-time fluctuation ratio of the power distribution terminal, and selects a target user terminal set according to the real-time fluctuation ratio and the power consumption level of each user terminal in the power distribution terminal;
s4, judging the number of the user terminals in the target user terminal set according to the number of the locatable user terminals arranged in the monitoring terminal, sequencing the user terminals by the monitoring terminal when the number of the user terminals in the target user terminal set exceeds the number of the locatable user terminals, and screening the user terminals; and when the number of the user terminals in the target user terminal set does not exceed the number of the locatable user terminals, sequentially carrying out fault ranging on each user terminal in the target user terminal set through a fault tester in the power distribution terminal, selecting a line with a fault, and judging that the line is fault locating at a fault ranging result.
Further, a unit monitoring time length t is set in the monitoring end, real-time distribution data of a corresponding distribution end detected by each detection point is received through the monitoring end, for real-time distribution data Mu of the corresponding distribution end detected by any detection point, the monitoring end obtains a historical distribution data set of the distribution end in the unit monitoring time length t before the time information Td according to the time information Td of the current moment, calculates an average value Mp of each historical distribution data in the historical distribution data set, and makes difference and absolute value between any one historical distribution data in the historical distribution data set and the average value Mp of the historical distribution data to obtain a historical distribution data difference set, and the monitoring end sums the historical distribution data difference set to obtain a real-time data fluctuation value Ms of the distribution end at the current moment;
the historical distribution data set comprises real-time distribution data Mu at the current moment.
Further, setting a time standard fluctuation value matrix corresponding to each power distribution end at the monitoring end, and when the monitoring end calculates a real-time data fluctuation value Ms of the power distribution end at the current moment, selecting a time standard fluctuation value matrix TM corresponding to the power distribution end by the monitoring end, wherein the time standard fluctuation value matrix TM is (T12-Mb 1, T23-Mb2 and T34-Mb3 … … Tn 1-Mbn), T12 is a first time period, T23 is a second time period, T34 is a third time period … … Tn1 is an nth time period, mb1 is a standard data fluctuation value in the first time period, mb2 is a standard data fluctuation value in the second time period, mb3 is a standard data fluctuation value … … Mbn in the third time period, and Mb1 is a standard data fluctuation value in the nth time period.
Further, when the monitoring terminal selects the time standard fluctuation value matrix TM corresponding to the power distribution terminal, the monitoring terminal matches the time information Td of the current moment of the power distribution terminal with each time segment in the time standard fluctuation value matrix TM, selects the standard data fluctuation value Mbi in the matched time segment, judges the real-time data fluctuation value Ms according to the standard data fluctuation value Mbi,
if the real-time data fluctuation value Ms does not exceed the standard data fluctuation value Mbi, the monitoring end judges that the real-time power distribution data of the power distribution end is not abnormal, and the monitoring end monitors and judges the next power distribution end;
if the real-time data fluctuation value Ms exceeds the standard data fluctuation value Mbi, the monitoring end judges that the real-time power distribution data of the power distribution end is abnormal, and the monitoring end selects a target user end set according to the real-time data fluctuation value and the power consumption level of each user end in the power distribution end;
where i=1, 2, 3 … … n.
Further, a first preset electricity consumption E1 and a second preset electricity consumption E2 are arranged in the monitoring end, wherein E1 is smaller than E2, a unit electricity consumption time length te is arranged in the monitoring end, the monitoring end is connected with an electricity consumption feedback end, the electricity consumption feedback end is used for detecting the electricity consumption of each user end in any power distribution end, the monitoring end can set the corresponding electricity consumption grade of each user end according to the electricity consumption of each user end, for any user end, the monitoring end obtains the actual electricity consumption Es of the user end in the unit electricity consumption time length te through the electricity consumption feedback end, and compares the actual electricity consumption Es with the first preset electricity consumption E1 and the second preset electricity consumption E2,
when Es is less than or equal to E1, the monitoring terminal sets the user terminal with the actual electricity consumption Es as a first electricity level;
when E1 is more than Es and less than or equal to E2, the monitoring terminal sets the user terminal with the actual electricity consumption of Es as a second electricity consumption level;
when Es > E2, the monitoring terminal sets the user terminal with the actual electricity consumption of Es as a third electricity level.
Further, the monitoring end is provided with a first fluctuation ratio A1, a second fluctuation ratio A2 and a third fluctuation ratio A3, wherein A1 is smaller than A2 and smaller than A3, when the real-time data fluctuation value Ms of the power distribution end exceeds the standard data fluctuation value Mbi, the monitoring end calculates the real-time fluctuation ratio As of the power distribution end, as=Mbi/Ms, and judges the real-time fluctuation ratio As,
when As is less than or equal to A1, the monitoring terminal selects the user terminal of each first electric quantity grade in the power distribution terminal As a target user terminal set;
when A1 is more than As and less than or equal to A2, the monitoring terminal selects the user terminal of each second electricity consumption level in the power distribution terminal As a target user terminal set;
when A2 is more than As and less than or equal to A3, the monitoring terminal selects the user terminal of each third electric quantity grade in the power distribution terminal As a target user terminal set;
when As > A3, the monitoring end will determine that a range fault occurs within the distribution end and will directly determine that the distribution end is fault locating.
Further, the monitoring terminal is internally provided with the quantity Ck of the locatable user terminals, after the monitoring terminal finishes selecting the target user terminal set, the monitoring terminal obtains the quantity Cj of the user terminals in the target user terminal set, judges the quantity Cj of the user terminals in the target user terminal set according to the quantity Ck of the locatable user terminals,
if the number Cj of the user terminals in the target user terminal set exceeds the number Ck of the positionable user terminals, the monitoring terminal obtains the actual power consumption of each user terminal in the target user terminal set through the power consumption feedback terminal, sorts the user terminals to form a first-level judgment sorting so as to screen the user terminals;
if the number Cj of the user terminals in the target user terminal set does not exceed the number Ck of the locatable user terminals, the monitoring terminal controls the fault testers in the power distribution terminal to sequentially perform fault distance measurement on each user terminal in the target user terminal set, selects a line with a fault between the user terminal and the power distribution terminal, and judges that the line is fault location at a fault distance measurement result.
Further, when the number Cj of the user terminals in the target user terminal set exceeds the number Ck of the locatable user terminals, the monitoring terminal performs user terminal screening, ranks according to the actual power consumption of each user terminal in the target user terminal set from large to small to form a first-stage judgment ranking, and respectively accesses each user terminal of the front Cq number in the first-stage judgment ranking and each user terminal of the rear Ch number in the first-stage judgment ranking through a phasor measurement device arranged behind the power distribution terminal to detect,
if faults exist in all the user terminals of the Cq number before the first-stage judgment sequencing, the monitoring terminal selects all the user terminals of the Cq number before the first-stage judgment sequencing to form a second-stage judgment sequencing;
if faults exist in all the user terminals of the number Ch after the first-level judgment and sequencing, the monitoring terminal selects all the user terminals of the number Ch after the first-level judgment and sequencing to form a second-level judgment and sequencing;
if faults exist in all the user terminals of the Cq number before the first-level judgment and the user terminals of the Ch number after the first-level judgment and the sequencing, the monitoring terminal reorders all the user terminals in the first-level judgment and the sequencing;
where cq=cj/2, ch=cj-Cq, and when Cj/2 is not an integer, the integer value of Cq is taken.
Further, when faults exist in each user end of the front Cq number and each user end of the back Ch number in the first-stage judging and sorting, each user end in the first-stage judging and sorting is randomly sorted, the first-stage judging and sorting is formed again, the monitoring end repeats the operation of detecting the phasor measuring device respectively connected to each user end of the front Cq number in the first-stage judging and sorting and each user end of the back Ch number in the first-stage judging and sorting until the detection result is that faults exist in each user end of the front Cq number in the first-stage judging and sorting or faults exist in each user end of the back Ch number in the first-stage judging and sorting, and the monitoring end stops the random sorting operation of each user end.
Further, when the monitoring terminal forms the second-level judgment sequence, the monitoring terminal acquires the number of each user terminal in the second-level judgment sequence, and repeats the operation of judging the number of each user terminal according to the number of the locatable user terminals,
if the number of the user terminals in the second-level judging and sorting exceeds the number of the locatable user terminals, the monitoring terminal repeats the operation of screening the user terminals until the number of the user terminals in the formed judging and sorting does not exceed the number of the locatable user terminals, and the monitoring terminal stops the operation of screening the user terminals;
if the number of the user terminals in the second-level judging and sorting is not more than the number of the locatable user terminals, the monitoring terminal controls the fault tester to conduct fault distance measurement, a line with a fault between the user terminal and the power distribution terminal is selected, and the line is judged to be fault location at a fault distance measurement result.
Compared with the prior art, the method has the advantages that the real-time distribution data are detected by arranging detection points between the power plant end and each distribution end, the real-time data fluctuation value is calculated to carry out abnormal determination of the corresponding distribution end, each distribution end can be monitored in real time, the abnormal distribution end can be timely and accurately locked, the target user end set with the corresponding grade is selected according to the real-time fluctuation ratio of the abnormal distribution end, the non-fault user end is rapidly screened, the number of target user ends is reduced by screening the target user end set, when the number of target user ends reaches the number of positionable user ends, fault location is carried out by sequentially carrying out fault ranging through the fault tester, only one detection point can be arranged in front of each distribution end, and a fault tester and a phasor measuring device are arranged behind the distribution end, so that efficient and accurate fault detection location in the distribution network range is realized.
Further, unit monitoring time length is set in the monitoring end to serve as a reference for acquiring a historical distribution data set, and a real-time data fluctuation value is calculated according to the historical distribution data set of time information at the current moment so as to represent the stability of the distribution end at the current moment, so that the moment data are converted into time period data, the accuracy of the real-time data fluctuation value of the current judgment distribution end is guaranteed, and the fault judgment accuracy is improved.
In particular, by setting the time standard fluctuation value matrix corresponding to each power distribution end in the monitoring end, the standard data fluctuation value of any power distribution end in each time period can be accurately determined, so that the stability degree of the power distribution end in each time period is reflected, the reliability of the judgment standard is ensured, and the normal operation of fault positioning judgment is ensured.
Further, according to the electricity consumption of each user end detected by the electricity consumption feedback end, the electricity consumption level of each user end is determined, the influence of the user end on the fluctuation of the power distribution end data is indicated by setting the electricity consumption level of the user end, meanwhile, the electricity consumption level of each user end is set, the user end can be rapidly classified and screened, the screening time of fault location is reduced, and the efficiency of fault location of a power distribution area is greatly improved.
In particular, the user terminal with the applied electric quantity grade is selected as a target according to the real-time fluctuation ratio of the power distribution terminal, and each selected user terminal is selected as a target user terminal set, so that the screening efficiency is improved, meanwhile, the influence of the electric quantity grade of the user terminal on the data fluctuation of the power distribution terminal is larger, the screening precision of the fault user terminal can be improved according to the corresponding real-time fluctuation ratio, and the accuracy of the power distribution fault positioning is further ensured.
Further, the number of the locatable user terminals is set in the monitoring terminal, when the number of the user terminals in the target user terminal set does not exceed the number of the locatable user terminals, the requirement of user terminal screening is met, so that fault ranging can be sequentially carried out on all the user terminals in the target user terminal set through a fault tester to obtain a result of whether faults and fault distances exist, and fault positioning is completed.
Further, when the number of the user terminals in the target user terminal set exceeds the number of the positionable user terminals, the first-stage judgment and sorting all the user terminals are divided into two parts with equal or close numbers, and two connection judgment is carried out on all the user terminals of the two parts through the phasor measurement device, so that the quick screening of the fault user terminal line is realized, and when faults exist in both the two split parts, the re-random sorting is carried out, so that the normal screening of the user terminals is ensured.
Drawings
FIG. 1 is a flowchart of a method for positioning synchronous data faults of a power distribution network according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating connection of a power plant according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating connection of a monitoring terminal according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating connection of the power feedback terminals according to an embodiment of the present invention;
fig. 5 is a schematic connection diagram of a power distribution terminal according to an embodiment of the present invention.
Detailed Description
In order that the objects and advantages of the invention will become more apparent, the invention will be further described with reference to the following examples; it should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that, in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," "outer," and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
Referring to fig. 1, which is a flowchart of a method for positioning synchronous data faults of a power distribution network according to an embodiment of the present invention, the embodiment discloses a method for positioning synchronous data faults of a power distribution network, including,
step S1, setting detection points between a power plant end and each power distribution end, detecting real-time power distribution data of each power distribution end, and calculating the real-time power distribution data of each power distribution end through a monitoring end connected with each detection point to obtain a real-time data fluctuation value in unit monitoring duration;
step S2, setting a time standard fluctuation value matrix corresponding to each power distribution end in the monitoring end, selecting a corresponding standard power distribution fluctuation value in the time standard fluctuation value matrix according to the time information of the current moment, judging the real-time data fluctuation value according to the selected standard power distribution fluctuation value, and determining whether the real-time power distribution data of each power distribution end is abnormal or not;
step S3, when any power distribution terminal of the monitoring terminal has abnormality of real-time power distribution data, the monitoring terminal calculates the real-time fluctuation ratio of the power distribution terminal, and selects a target user terminal set according to the real-time fluctuation ratio and the power consumption level of each user terminal in the power distribution terminal;
s4, judging the number of the user terminals in the target user terminal set according to the number of the locatable user terminals arranged in the monitoring terminal, sequencing the user terminals by the monitoring terminal when the number of the user terminals in the target user terminal set exceeds the number of the locatable user terminals, and screening the user terminals; and when the number of the user terminals in the target user terminal set does not exceed the number of the locatable user terminals, sequentially carrying out fault ranging on each user terminal in the target user terminal set through a fault tester in the power distribution terminal, selecting a line with a fault, and judging that the line is fault locating at a fault ranging result.
In this embodiment, the detection point is set as a PMU synchronous phasor measurement device PCS-996G, and the detected real-time distribution data may be one or more of distribution voltage data, distribution current data and distribution power data, and a time standard fluctuation matrix set in the monitoring end should be collected and set for corresponding time information of the historical real-time distribution data of the corresponding power distribution end and the historical real-time distribution data.
Please continue to refer to fig. 2, which is a schematic diagram illustrating a power plant connection according to an embodiment of the present invention, wherein,
the method comprises the steps of setting detection points between a power plant end and each power distribution end to detect real-time power distribution data, calculating real-time data fluctuation values to carry out abnormality determination of the corresponding power distribution ends, monitoring each power distribution end in real time, timely and accurately locking the power distribution end with abnormality, selecting a target user end set with a corresponding grade according to the real-time fluctuation ratio of the power distribution end with abnormality, rapidly screening non-fault user ends, screening the target user end set to reduce the number of the target user ends, and sequentially carrying out fault ranging through fault testers to carry out fault location when the number of the target user ends reaches the number of the positionable user ends, wherein one detection point can be only arranged in front of each power distribution end, and a fault tester and a phasor measuring device are arranged behind the power distribution end to realize efficient and accurate fault detection location in a power distribution network range.
Please continue to refer to fig. 3, which is a schematic diagram illustrating connection of the monitoring end according to an embodiment of the present invention,
specifically, a unit monitoring time length t is set in the monitoring end, real-time distribution data of a corresponding distribution end detected by each detection point is received through the monitoring end, for real-time distribution data Mu of the corresponding distribution end detected by any detection point, the monitoring end obtains a historical distribution data set of the distribution end in the unit monitoring time length t before the time information Td according to the time information Td of the current moment, calculates an average value Mp of each historical distribution data in the historical distribution data set, makes a difference and an absolute value between any one of the historical distribution data set and the average value Mp of the historical distribution data to obtain a historical distribution data difference set, and the monitoring end sums the historical distribution data difference set to obtain a real-time data fluctuation value Ms of the distribution end at the current moment;
the historical distribution data set comprises real-time distribution data Mu at the current moment.
The unit monitoring time length is set in the monitoring end to serve as a reference for acquiring the historical distribution data set, and the real-time data fluctuation value is calculated according to the historical distribution data set of the time information at the current moment to represent the stability of the distribution end at the current moment, so that the moment data are converted into the time period data, the accuracy of the real-time data fluctuation value of the current judgment distribution end is guaranteed, and the fault judgment accuracy is improved.
Specifically, a time standard fluctuation value matrix corresponding to each power distribution end is set at the monitoring end, when the monitoring end calculates a real-time data fluctuation value Ms of the power distribution end at the current moment, the monitoring end selects a time standard fluctuation value matrix TM corresponding to the power distribution end, wherein the time standard fluctuation value matrix TM is (T12-Mb 1, T23-Mb2 and T34-Mb3 … … Tn 1-Mbn), T12 is a first time period, T23 is a second time period, T34 is a third time period … … Tn1 is an nth time period, mb1 is a standard data fluctuation value in the first time period, mb2 is a standard data fluctuation value in the second time period, mb3 is a standard data fluctuation value … … Mb n in the third time period, and Mb1 is a standard data fluctuation value in the nth time period.
By setting the time standard fluctuation value matrix corresponding to each power distribution end in the monitoring end, the standard data fluctuation value of any power distribution end in each time period can be accurately determined, so that the stability degree of the power distribution end in each time period is reflected, the reliability of the judgment standard is ensured, and the normal operation of fault positioning judgment is ensured.
Specifically, when the monitoring terminal selects a time standard fluctuation value matrix TM corresponding to the power distribution terminal, the monitoring terminal matches the time information Td of the current moment of the power distribution terminal with each time segment in the time standard fluctuation value matrix TM, selects a standard data fluctuation value Mbi in the matched time segment, determines a real-time data fluctuation value Ms according to the standard data fluctuation value Mbi,
if the real-time data fluctuation value Ms does not exceed the standard data fluctuation value Mbi, the monitoring end judges that the real-time power distribution data of the power distribution end is not abnormal, and the monitoring end monitors and judges the next power distribution end;
if the real-time data fluctuation value Ms exceeds the standard data fluctuation value Mbi, the monitoring end judges that the real-time power distribution data of the power distribution end is abnormal, and the monitoring end selects a target user end set according to the real-time data fluctuation value and the power consumption level of each user end in the power distribution end;
where i=1, 2, 3 … … n.
Please continue to refer to fig. 4, which is a schematic diagram illustrating connection of the power feedback terminals according to an embodiment of the present invention,
specifically, a first preset electricity consumption E1 and a second preset electricity consumption E2 are set in the monitoring end, wherein E1 is smaller than E2, a unit electricity consumption time length te is set in the monitoring end, the monitoring end is connected with an electricity consumption feedback end, the electricity consumption feedback end is used for detecting the electricity consumption of each user end in any power distribution end, the monitoring end can set the corresponding electricity consumption level of each user end according to the electricity consumption of each user end, for any user end, the monitoring end obtains the actual electricity consumption Es of the user end in the unit electricity consumption time length te through the electricity consumption feedback end, compares the actual electricity consumption Es with the first preset electricity consumption E1 and the second preset electricity consumption E2,
when Es is less than or equal to E1, the monitoring terminal sets the user terminal with the actual electricity consumption Es as a first electricity level;
when E1 is more than Es and less than or equal to E2, the monitoring terminal sets the user terminal with the actual electricity consumption of Es as a second electricity consumption level;
when Es > E2, the monitoring terminal sets the user terminal with the actual electricity consumption of Es as a third electricity level.
According to the power consumption of each user end detected by the power consumption feedback end, the power consumption grade of each user end is determined, the influence of the user end on the fluctuation of the power distribution end data is indicated by setting the power consumption grade of the user end, meanwhile, the power consumption grade of each user end is set, the user end can be rapidly classified and screened, the screening time of fault location is reduced, and the efficiency of fault location of a power distribution area is greatly improved.
Specifically, the monitoring terminal is provided with a first fluctuation ratio A1, a second fluctuation ratio A2 and a third fluctuation ratio A3, wherein A1 is less than A2 and less than A3, when the real-time data fluctuation value Ms of the power distribution terminal exceeds the standard data fluctuation value Mbi, the monitoring terminal calculates the real-time fluctuation ratio As of the power distribution terminal, as=Mbi/Ms, and judges the real-time fluctuation ratio As,
when As is less than or equal to A1, the monitoring terminal selects the user terminal of each first electric quantity grade in the power distribution terminal As a target user terminal set;
when A1 is more than As and less than or equal to A2, the monitoring terminal selects the user terminal of each second electricity consumption level in the power distribution terminal As a target user terminal set;
when A2 is more than As and less than or equal to A3, the monitoring terminal selects the user terminal of each third electric quantity grade in the power distribution terminal As a target user terminal set;
when As > A3, the monitoring end will determine that a range fault occurs within the distribution end and will directly determine that the distribution end is fault locating.
The user terminal of the applied electric quantity grade is selected as a target according to the real-time fluctuation ratio of the power distribution terminal, and each selected user terminal is selected as a target user terminal set, so that screening efficiency is improved, meanwhile, the influence of the electric quantity grade of the user terminal on the data fluctuation of the power distribution terminal is large, the screening accuracy of the fault user terminal can be improved according to the corresponding real-time fluctuation ratio, and the accuracy of power distribution fault positioning is further guaranteed.
Please refer to fig. 5, which is a schematic connection diagram of the distribution terminal according to the embodiment of the present invention, in this embodiment, the fault rangefinder provided at the distribution terminal is an HM-DL91 cable fault rangefinder, and is configured to be capable of being automatically disconnected or connected with each user terminal in the corresponding distribution terminal, and is connected to and controlled by the monitoring terminal, and the phasor measurement device provided at the distribution terminal is an (RP 1705B) NSR3710A type synchronous phasor measurement device, and is configured to be capable of being automatically disconnected or connected with each user terminal in the corresponding distribution terminal, and is connected to and controlled by the monitoring terminal, and is configured to be corresponding to a monitoring program in the monitoring terminal, so as to perform a range fault determination.
Specifically, the monitoring terminal is internally provided with the quantity Ck of the locatable user terminals, after the monitoring terminal finishes selecting the target user terminal set, the monitoring terminal obtains the quantity Cj of the user terminals in the target user terminal set, judges the quantity Cj of the user terminals in the target user terminal set according to the quantity Ck of the locatable user terminals,
if the number Cj of the user terminals in the target user terminal set exceeds the number Ck of the positionable user terminals, the monitoring terminal obtains the actual power consumption of each user terminal in the target user terminal set through the power consumption feedback terminal, sorts the user terminals to form a first-level judgment sorting so as to screen the user terminals;
if the number Cj of the user terminals in the target user terminal set does not exceed the number Ck of the locatable user terminals, the monitoring terminal controls the fault testers in the power distribution terminal to sequentially perform fault distance measurement on each user terminal in the target user terminal set, selects a line with a fault between the user terminal and the power distribution terminal, and judges that the line is fault location at a fault distance measurement result.
The number of the locatable user terminals is set in the monitoring terminal, when the number of the user terminals in the target user terminal set does not exceed the number of the locatable user terminals, the requirement of user terminal screening is met, so that fault ranging can be sequentially carried out on all the user terminals in the target user terminal set through a fault tester to obtain a result of whether faults and fault distances exist or not, and fault location is completed.
Specifically, when the number Cj of the user terminals in the target user terminal set exceeds the number Ck of the positionable user terminals, the monitoring terminal performs user terminal screening, ranks according to the actual power consumption of each user terminal in the target user terminal set from large to small to form a first-stage judgment ranking, and respectively accesses each user terminal of the front Cq number in the first-stage judgment ranking and each user terminal of the rear Ch number in the first-stage judgment ranking through a phasor measurement device arranged behind the power distribution terminal to detect,
if faults exist in all the user terminals of the Cq number before the first-stage judgment sequencing, the monitoring terminal selects all the user terminals of the Cq number before the first-stage judgment sequencing to form a second-stage judgment sequencing;
if faults exist in all the user terminals of the number Ch after the first-level judgment and sequencing, the monitoring terminal selects all the user terminals of the number Ch after the first-level judgment and sequencing to form a second-level judgment and sequencing;
if faults exist in all the user terminals of the Cq number before the first-level judgment and the user terminals of the Ch number after the first-level judgment and the sequencing, the monitoring terminal reorders all the user terminals in the first-level judgment and the sequencing;
where cq=cj/2, ch=cj-Cq, and when Cj/2 is not an integer, the integer value of Cq is taken.
When the number of the user ends in the target user end set exceeds the number of the positionable user ends, the first-level judgment and sorting are divided into two parts with equal or close numbers, and two connection judgment is carried out on the user ends of the two parts through the phasor measurement device, so that the quick screening of the fault user end line is realized, and when faults exist in the two split parts, the re-random sorting is carried out, so that the normal screening of the user ends is ensured.
Specifically, when faults exist in each user end of the front Cq number and each user end of the back Ch number in the first-stage judging and sorting, each user end in the first-stage judging and sorting is randomly sorted, the first-stage judging and sorting is formed again, the monitoring end repeats the operation of detecting the phasor measuring device respectively connected to each user end of the front Cq number in the first-stage judging and sorting and each user end of the back Ch number in the first-stage judging and sorting until the detection result is that faults exist in each user end of the front Cq number in the first-stage judging and sorting or faults exist in each user end of the back Ch number in the first-stage judging and sorting, and the monitoring end stops random sorting operation of each user end.
Specifically, the monitoring terminal acquires the number of each user terminal in the secondary judgment sequence when forming the secondary judgment sequence, the monitoring terminal repeats the operation of judging the number of each user terminal according to the number of the locatable user terminals,
if the number of the user terminals in the second-level judging and sorting exceeds the number of the locatable user terminals, the monitoring terminal repeats the operation of screening the user terminals until the number of the user terminals in the formed judging and sorting does not exceed the number of the locatable user terminals, and the monitoring terminal stops the operation of screening the user terminals;
if the number of the user terminals in the second-level judging and sorting is not more than the number of the locatable user terminals, the monitoring terminal controls the fault tester to conduct fault distance measurement, a line with a fault between the user terminal and the power distribution terminal is selected, and the line is judged to be fault location at a fault distance measurement result.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will be within the scope of the present invention.
The foregoing description is only of the preferred embodiments of the invention and is not intended to limit the invention; various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A method for positioning the synchronous data faults of a power distribution network is characterized by comprising the following steps of,
step S1, setting detection points between a power plant end and each power distribution end, detecting real-time power distribution data of each power distribution end, and calculating the real-time power distribution data of each power distribution end through a monitoring end connected with each detection point to obtain a real-time data fluctuation value in unit monitoring duration;
step S2, setting a time standard fluctuation value matrix corresponding to each power distribution end in the monitoring end, selecting a corresponding standard power distribution fluctuation value in the time standard fluctuation value matrix according to the time information of the current moment, judging the real-time data fluctuation value according to the selected standard power distribution fluctuation value, and determining whether the real-time power distribution data of each power distribution end is abnormal or not;
step S3, when any power distribution terminal of the monitoring terminal has abnormality of real-time power distribution data, the monitoring terminal calculates the real-time fluctuation ratio of the power distribution terminal, and selects a target user terminal set according to the real-time fluctuation ratio and the power consumption level of each user terminal in the power distribution terminal;
s4, judging the number of the user terminals in the target user terminal set according to the number of the locatable user terminals arranged in the monitoring terminal, sequencing the user terminals by the monitoring terminal when the number of the user terminals in the target user terminal set exceeds the number of the locatable user terminals, and screening the user terminals; when the number of the user terminals in the target user terminal set does not exceed the number of the locatable user terminals, sequentially carrying out fault ranging on each user terminal in the target user terminal set through a fault tester in the power distribution terminal, selecting a line with a fault, and judging that the line is fault locating at a fault ranging result;
setting a unit monitoring time length t in the monitoring end, receiving real-time distribution data of a corresponding distribution end detected by each detection point through the monitoring end, and summing the difference sets of the historical distribution data according to time information Td of the current moment to obtain a historical distribution data set of the distribution end in the unit monitoring time length t before the time information Td, calculating an average value Mp of each historical distribution data in the historical distribution data set, and taking the difference between any one of the historical distribution data set and the average value Mp of the historical distribution data and the absolute value to obtain a difference set of the historical distribution data;
the historical distribution data set comprises real-time distribution data Mu at the current moment;
setting a time standard fluctuation value matrix corresponding to each power distribution end at the monitoring end, and when the monitoring end calculates a real-time data fluctuation value Ms of the power distribution end at the current moment, selecting a time standard fluctuation value matrix TM corresponding to the power distribution end by the monitoring end, wherein the time standard fluctuation value matrix TM is (T12-Mb 1, T23-Mb2 and T34-Mb3 … … Tn 1-Mbn), T12 is a first time period, T23 is a second time period, T34 is a third time period … … Tn1 is an nth time period, mb1 is a standard data fluctuation value in the first time period, mb2 is a standard data fluctuation value in the second time period and Mb3 is a standard data fluctuation value … … Mbn in the third time period;
when the monitoring terminal selects a time standard fluctuation value matrix TM corresponding to the power distribution terminal, the monitoring terminal acquires time information Td of the current moment of the power distribution terminal, matches the time information Td with each time period in the time standard fluctuation value matrix TM, selects a standard data fluctuation value Mbi in the matched time period, judges the real-time data fluctuation value Ms according to the standard data fluctuation value Mbi,
if the real-time data fluctuation value Ms does not exceed the standard data fluctuation value Mbi, the monitoring end judges that the real-time power distribution data of the power distribution end is not abnormal, and the monitoring end monitors and judges the next power distribution end;
if the real-time data fluctuation value Ms exceeds the standard data fluctuation value Mbi, the monitoring end judges that the real-time power distribution data of the power distribution end is abnormal, and the monitoring end selects a target user end set according to the real-time data fluctuation value and the power consumption level of each user end in the power distribution end;
where i=1, 2, 3 … … n.
2. The method for locating synchronous data faults of a power distribution network according to claim 1, wherein a first preset power consumption E1 and a second preset power consumption E2 are arranged in the monitoring end, E1 is smaller than E2, a unit power consumption time length te is arranged in the monitoring end, the monitoring end is connected with a power consumption feedback end, the power consumption feedback end is used for detecting the power consumption of each user end in any power distribution end, the monitoring end can set the corresponding power consumption level of each user end according to the power consumption of each user end, for any user end, the monitoring end obtains the actual power consumption Es of the user end in the unit power consumption time length te through the power consumption feedback end, and compares the actual power consumption Es with the first preset power consumption E1 and the second preset power consumption E2,
when Es is less than or equal to E1, the monitoring terminal sets the user terminal with the actual electricity consumption Es as a first electricity level;
when E1 is more than Es and less than or equal to E2, the monitoring terminal sets the user terminal with the actual electricity consumption of Es as a second electricity consumption level;
when Es > E2, the monitoring terminal sets the user terminal with the actual electricity consumption of Es as a third electricity level.
3. The method for locating a synchronous data fault of a power distribution network according to claim 2, wherein the monitoring terminal is provided with a first fluctuation ratio A1, a second fluctuation ratio A2 and a third fluctuation ratio A3, wherein A1 < A2 < A3, when the real-time data fluctuation value Ms of the power distribution terminal exceeds the standard data fluctuation value Mbi, the monitoring terminal calculates the real-time fluctuation ratio As of the power distribution terminal, as=mbi/Ms, and determines the real-time fluctuation ratio As,
when As is less than or equal to A1, the monitoring terminal selects the user terminal of each first electric quantity grade in the power distribution terminal As a target user terminal set;
when A1 is more than As and less than or equal to A2, the monitoring terminal selects the user terminal of each second electricity consumption level in the power distribution terminal As a target user terminal set;
when A2 is more than As and less than or equal to A3, the monitoring terminal selects the user terminal of each third electric quantity grade in the power distribution terminal As a target user terminal set;
when As > A3, the monitoring end will determine that a range fault occurs within the distribution end and will directly determine that the distribution end is fault locating.
4. The method for locating the synchronous data faults of the power distribution network according to claim 3, wherein the monitoring end is internally provided with the quantity Ck of the locatable user ends, after the monitoring end finishes selecting the target user end set, the monitoring end obtains the quantity Cj of the user ends in the target user end set and judges the quantity Cj of the user ends in the target user end set according to the quantity Ck of the locatable user ends,
if the number Cj of the user terminals in the target user terminal set exceeds the number Ck of the positionable user terminals, the monitoring terminal obtains the actual power consumption of each user terminal in the target user terminal set through the power consumption feedback terminal, sorts the user terminals to form a first-level judgment sorting so as to screen the user terminals;
if the number Cj of the user terminals in the target user terminal set does not exceed the number Ck of the locatable user terminals, the monitoring terminal controls the fault testers in the power distribution terminal to sequentially perform fault distance measurement on each user terminal in the target user terminal set, selects a line with a fault between the user terminal and the power distribution terminal, and judges that the line is fault location at a fault distance measurement result.
5. The method for locating synchronous data faults of power distribution network according to claim 4, wherein when the number Cj of user terminals in a target user terminal set exceeds the number Ck of locatable user terminals, the monitoring terminal performs user terminal screening, ranks according to the actual power consumption of each user terminal in the target user terminal set from large to small to form a first-stage judgment ranking, and respectively accesses each user terminal of the front Cq number in the first-stage judgment ranking and each user terminal of the rear Ch number in the first-stage judgment ranking through a phasor measurement device arranged behind the power distribution terminal to detect,
if faults exist in all the user terminals of the Cq number before the first-stage judgment sequencing, the monitoring terminal selects all the user terminals of the Cq number before the first-stage judgment sequencing to form a second-stage judgment sequencing;
if faults exist in all the user terminals of the number Ch after the first-level judgment and sequencing, the monitoring terminal selects all the user terminals of the number Ch after the first-level judgment and sequencing to form a second-level judgment and sequencing;
if faults exist in all the user terminals of the Cq number before the first-level judgment and the user terminals of the Ch number after the first-level judgment and the sequencing, the monitoring terminal reorders all the user terminals in the first-level judgment and the sequencing;
where cq=cj/2, ch=cj-Cq, and if Cj/2 is not an integer, cq takes an integer value.
6. The method for locating a fault in synchronous data of power distribution network according to claim 5, wherein when faults exist in each user terminal of the number of Cq before the first-stage judgment and each user terminal of the number of Ch after the first-stage judgment, the monitoring terminal performs random sequencing on each user terminal in the first-stage judgment and then re-forms the first-stage judgment and sequences the operation of detecting the phasor measurement device respectively connected to each user terminal of the number of Cq before the first-stage judgment and each user terminal of the number of Ch after the first-stage judgment until the detection result is that faults exist in each user terminal of the number of Cq before the first-stage judgment and faults exist in each user terminal of the number of Ch after the first-stage judgment and sequences, and the monitoring terminal stops the random sequencing operation on each user terminal.
7. The method for locating synchronous data faults of power distribution networks according to claim 5, wherein the monitoring terminal obtains the number of each user terminal in the secondary judgment sequence when the secondary judgment sequence is formed, the monitoring terminal repeats the operation of judging the number of each user terminal according to the number of the locatable user terminals,
if the number of the user terminals in the second-level judging and sorting exceeds the number of the locatable user terminals, the monitoring terminal repeats the operation of screening the user terminals until the number of the user terminals in the formed judging and sorting does not exceed the number of the locatable user terminals, and the monitoring terminal stops the operation of screening the user terminals;
if the number of the user terminals in the second-level judging and sorting is not more than the number of the locatable user terminals, the monitoring terminal controls the fault tester to conduct fault distance measurement, a line with a fault between the user terminal and the power distribution terminal is selected, and the line is judged to be fault location at a fault distance measurement result.
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