CN110426606B - Power distribution network ground fault positioning method and device based on wide area synchronization - Google Patents
Power distribution network ground fault positioning method and device based on wide area synchronization Download PDFInfo
- Publication number
- CN110426606B CN110426606B CN201910858615.0A CN201910858615A CN110426606B CN 110426606 B CN110426606 B CN 110426606B CN 201910858615 A CN201910858615 A CN 201910858615A CN 110426606 B CN110426606 B CN 110426606B
- Authority
- CN
- China
- Prior art keywords
- voltage
- line
- tail end
- zero sequence
- bus side
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000009826 distribution Methods 0.000 title claims abstract description 17
- 230000002159 abnormal effect Effects 0.000 claims abstract description 40
- 238000012544 monitoring process Methods 0.000 claims abstract description 19
- 208000012661 Dyskinesia Diseases 0.000 claims description 10
- 230000004807 localization Effects 0.000 claims 1
- 230000007257 malfunction Effects 0.000 abstract description 4
- 238000003745 diagnosis Methods 0.000 abstract description 2
- 238000005070 sampling Methods 0.000 description 18
- 230000035772 mutation Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 9
- 238000004590 computer program Methods 0.000 description 7
- 230000008859 change Effects 0.000 description 6
- 230000001629 suppression Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000001052 transient effect Effects 0.000 description 4
- 238000011144 upstream manufacturing Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000003708 edge detection Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000001568 sexual effect Effects 0.000 description 1
Images
Classifications
-
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Locating Faults (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a power distribution network ground fault positioning method and device based on wide area synchronization, and relates to the technical field of power system fault diagnosis, wherein the method comprises the following steps: acquiring zero sequence voltage transaction time of the bus side according to the voltage transaction of the bus side; acquiring zero sequence voltage abnormal operation time of the tail end of the line according to the voltage abnormal operation of the tail end of the line; and determining the fault position according to the bus side zero sequence voltage variation time and the line tail end zero sequence voltage variation time. According to the technical scheme, the conditions of sensor misoperation and sensor malfunction can be avoided, the reliability of the equipment is improved, and meanwhile, the waveform of the recorded voltage can be transmitted back to the bus side edge proxy module through the zero sequence voltage monitoring module at the tail end of each outgoing line, so that the accurate positioning of a fault point is realized.
Description
Technical Field
The invention relates to the technical field of power system fault diagnosis, in particular to a power distribution network ground fault positioning method and device based on wide area synchronization.
Background
The power grid 10kV system is a small-current grounding system, particularly a small-current grounding system compensated by an arc suppression coil, the steady-state fault characteristics are not obvious after single-phase grounding, a conventional algorithm cannot be selected accurately, and the algorithm capable of accurately acquiring the transient characteristic quantity is difficult to realize. If distribution lines takes place that ground fault can't be amputated for a long time, distribution lines fall behind ground, easily because of step voltage or contact voltage harm pedestrian that the way passed. When the grounding current exceeds a certain range, the electric arc is difficult to extinguish automatically, the distribution line is easy to burn, fire disasters are caused, and the power supply reliability is seriously influenced.
Distribution automation develops at a high speed, and for realizing the automatic full coverage of distribution lines fast, intelligent terminals such as DTU, FTU, fault indicator have mainly been adopted, and especially fault indicator relies on advantages such as sexual valence relative altitude, installation are easy, need not to have a power failure, is applied to overhead line fault indication and study and judge in batches. However, due to factors such as the design of the fault indicator, the manufacturing quality of a manufacturer, the field environment and the like, the fault indicator has the problems of indicator misoperation, indicator refusal, incapability of capturing transient information with high precision and asynchronization of recording data and the like, so that the fault indicator is inaccurate in fault location and research and judgment, and brings inconvenience to fault isolation and emergency repair work.
Disclosure of Invention
In view of the above defects in the prior art, an object of the present invention is to provide a power distribution network ground fault location method and apparatus based on wide area synchronization, which avoid sensor malfunction and malfunction, improve the reliability of the device, and simultaneously, can transmit the waveform of the recorded voltage back to the bus-side edge proxy module through the zero sequence voltage monitoring module at the tail end of each outgoing line, thereby realizing accurate location of the fault point.
One of the purposes of the present invention is achieved by such a technical solution, a method for positioning a ground fault of a power distribution network based on wide area synchronization, the method comprising the following steps:
acquiring zero sequence voltage transaction time of the bus side according to the voltage transaction of the bus side;
acquiring zero sequence voltage abnormal operation time of the tail end of the line according to the voltage abnormal operation of the tail end of the line;
and determining the fault position according to the bus side zero sequence voltage variation time and the line tail end zero sequence voltage variation time.
Optionally, obtaining the bus-side zero-sequence voltage transaction time according to the bus-side voltage transaction includes:
when the voltage on the bus side varies, acquiring the voltage variation time of the bus side;
intercepting a specified number of bus side voltage cycles before and after the bus side voltage transaction moment, and integrating the bus side voltage cycles into a bus side zero sequence voltage waveform;
performing linear fitting on the bus side zero sequence voltage waveform based on the bus side voltage variation moment;
and correcting the voltage abnormal movement time of the bus side according to the linear fitting result.
Optionally, after obtaining the bus-side zero-sequence voltage transaction time according to the bus-side voltage transaction, the method further includes: the wave recording is carried out on each outgoing line, and the wave recording method comprises the following steps:
arranging sensor units on each outgoing line in a subsection mode, and starting the sensor units of each outgoing line to record waves at the voltage abnormal moment of the bus side;
intercepting a specified number of current cycles before and after the voltage fluctuation moment of the bus side, and integrating the current cycles into a zero-sequence current waveform;
and carrying out primary fault line selection and positioning based on the zero sequence current waveform.
Optionally, obtaining the zero sequence voltage variation time of the line end according to the voltage variation of the line end includes:
when the voltage variation of the tail end of the line is detected at the tail end of the outgoing line, the voltage variation moment of the tail end of the line is obtained;
intercepting a specified number of line tail end voltage cycles before and after the voltage transaction time of the line tail end, and integrating the line tail end voltage cycles into a line tail end zero sequence voltage waveform;
performing linear fitting on the zero sequence voltage waveform at the tail end of the line based on the voltage variation moment at the tail end of the line;
and correcting the voltage abnormal movement time of the tail end of the line according to the result of the linear fitting.
Optionally, determining a fault position according to the bus side zero sequence voltage transaction time and the line end zero sequence voltage transaction time includes:
determining a fault line and a fault section according to the preliminary fault line selection and positioning result;
and determining the position of a fault point according to the fault line and the fault section and based on the corrected voltage variation time of the tail end of the line and the corrected voltage variation time of the side of the bus.
The second purpose of the invention is realized by the technical scheme, the device for positioning the earth fault of the power distribution network based on wide area synchronization comprises the following steps:
the bus edge proxy module is used for acquiring bus side zero sequence voltage transaction time according to bus side voltage transaction;
the circuit zero sequence voltage monitoring module is used for acquiring the zero sequence voltage abnormal operation time of the tail end of the circuit according to the voltage abnormal operation of the tail end of the circuit;
and the bus edge proxy module is also used for determining the fault position according to the bus side zero sequence voltage transaction time and the line tail end zero sequence voltage transaction time.
Optionally, the bus edge proxy module is specifically configured to:
when the voltage on the bus side varies, acquiring the voltage variation time of the bus side;
intercepting a specified number of bus side voltage cycles before and after the bus side voltage transaction moment, and integrating the bus side voltage cycles into a bus side zero sequence voltage waveform;
performing linear fitting on the bus side zero sequence voltage waveform based on the bus side voltage variation moment;
and correcting the voltage abnormal movement time of the bus side according to the linear fitting result.
Optionally, the device further comprises a sensor unit;
the bus edge agent module is used for starting the sensor units of the outgoing lines to record waves at the voltage abnormal moment of the bus side;
the bus edge agent module is also used for intercepting current cycles of a specified quantity before and after the bus side voltage abnormal moment and integrating the current cycles into a zero sequence current waveform;
and carrying out primary fault line selection and positioning based on the zero sequence current waveform.
Optionally, the line zero sequence voltage monitoring module is specifically used for
When the voltage variation of the tail end of the line is detected at the tail end of the outgoing line, the voltage variation moment of the tail end of the line is obtained;
intercepting a specified number of line tail end voltage cycles before and after the voltage transaction time of the line tail end, and integrating the line tail end voltage cycles into a line tail end zero sequence voltage waveform;
performing linear fitting on the zero sequence voltage waveform at the tail end of the line based on the voltage variation moment at the tail end of the line;
and correcting the voltage abnormal movement time of the tail end of the line according to the result of the linear fitting.
Optionally, the bus edge agent module is specifically configured to determine a faulty line and a faulty section according to the preliminary fault line selection and location result;
and determining the position of a fault point according to the fault line and the fault section and based on the corrected voltage variation time of the tail end of the line and the corrected voltage variation time of the side of the bus.
Due to the adoption of the technical scheme, the invention has the following advantages: according to the technical scheme, the conditions of sensor misoperation and sensor malfunction can be avoided, the reliability of the equipment is improved, and meanwhile, the waveform of the recorded voltage can be transmitted back to the bus side edge proxy module through the zero sequence voltage monitoring module at the tail end of each outgoing line, so that the accurate positioning of a fault point is realized.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
The drawings of the invention are illustrated as follows:
FIG. 1 is a flow chart of a first embodiment of the present invention;
fig. 2 is a schematic diagram of a connection relationship according to a second embodiment of the present invention.
Detailed Description
The invention is further illustrated by the following figures and examples.
The first embodiment of the invention provides a power distribution network ground fault positioning method based on wide area synchronization, which comprises the following steps:
acquiring zero sequence voltage transaction time of the bus side according to the voltage transaction of the bus side;
acquiring zero sequence voltage abnormal operation time of the tail end of the line according to the voltage abnormal operation of the tail end of the line;
and determining the fault position according to the bus side zero sequence voltage variation time and the line tail end zero sequence voltage variation time.
The method avoids the conditions of sensor misoperation and failure, improves the reliability of the equipment, and simultaneously can transmit the waveform of the recorded voltage back to the bus side edge proxy module through the zero sequence voltage monitoring module at the tail end of each outgoing line so as to realize the accurate positioning of fault points.
Optionally, obtaining the bus-side zero-sequence voltage transaction time according to the bus-side voltage transaction includes:
when the voltage on the bus side varies, acquiring the voltage variation time of the bus side;
intercepting a specified number of bus side voltage cycles before and after the bus side voltage transaction moment, and integrating the bus side voltage cycles into a bus side zero sequence voltage waveform;
performing linear fitting on the bus side zero sequence voltage waveform based on the bus side voltage variation moment;
and correcting the voltage abnormal movement time of the bus side according to the linear fitting result.
Specifically, step S1: when the bus side edge proxy module detects voltage fluctuation, recording zero sequence voltage fluctuation time;
when the bus edge agent module detects bus voltage abnormal motion, according to detected abnormal motion time T01, intercepting the first 4 cycles and the last 8 cycles of voltage waveforms at the time, wherein the sampling frequency is 256 points per cycle, then merging the three-phase voltage waveforms into a zero-sequence voltage waveform, then respectively performing straight line fitting on the first 5 sampled data and the last 5 sampled data of T01 in the zero-sequence voltage waveform sampled data, respectively calculating the zero-sequence voltage and zero-axis crossing time as T02 and T03, taking the average value of T02 and T03 as T01 (when unbalanced voltage does not exist before a fault, taking T01 as T03), and correcting the zero-sequence voltage abnormal motion time as T01.
Optionally, after obtaining the bus-side zero-sequence voltage transaction time according to the bus-side voltage transaction, the method further includes: the wave recording is carried out on each outgoing line, and the wave recording method comprises the following steps:
arranging sensor units on each outgoing line in a subsection mode, and starting the sensor units of each outgoing line to record waves at the voltage abnormal moment of the bus side;
intercepting a specified number of current cycles before and after the voltage fluctuation moment of the bus side, and integrating the current cycles into a zero-sequence current waveform;
and carrying out primary fault line selection and positioning based on the zero sequence current waveform.
Step S2: the bus edge detection agent module starts a sensor unit installed on each outgoing line to record waves;
specifically, a bus side edge proxy module starts a sensor unit installed on each outgoing line to record waves, the starting time is t1, 4 first cycle current waveforms and 8 last cycle current waveforms at the moment are intercepted, the sampling frequency is 256 points of each cycle, the cycle current waveforms are combined into a zero sequence current waveform, sampling data of the last half cycle of t1 is obtained, the influence of an arc suppression coil can be avoided, the zero sequence current mutation direction is calculated, initial line selection and positioning are carried out according to the fact that the front and back zero sequence current directions of a fault point of a fault line are opposite, the zero sequence current mutation directions of the head ends of the fault line and a non-fault line are opposite, zero sequence current mutation time is recorded, and the upstream mutation time and the downstream mutation time of the fault point are respectively recorded as Txm and Txn.
Optionally, obtaining the zero sequence voltage variation time of the line end according to the voltage variation of the line end includes:
when the voltage variation of the tail end of the line is detected at the tail end of the outgoing line, the voltage variation moment of the tail end of the line is obtained;
intercepting a specified number of line tail end voltage cycles before and after the voltage transaction time of the line tail end, and integrating the line tail end voltage cycles into a line tail end zero sequence voltage waveform;
performing linear fitting on the zero sequence voltage waveform at the tail end of the line based on the voltage variation moment at the tail end of the line;
and correcting the voltage abnormal movement time of the tail end of the line according to the result of the linear fitting.
Specifically, step S3: a zero sequence voltage monitoring module is installed at the tail end of each outgoing line, and zero sequence voltage abnormal operation time is recorded;
when voltage abnormal motion is detected by each outgoing line terminal zero sequence voltage monitoring module, according to the detected abnormal motion time Tx1, intercepting the first 4 cycle voltage waveforms and the last 8 cycle voltage waveforms (the sampling frequency is 256 points per cycle), merging the three-phase voltage waveforms into zero sequence voltage waveforms, respectively performing straight line fitting on the first 5 sampling data and the last 5 sampling data of Tx2 in the zero sequence voltage waveform sampling data, respectively calculating the zero-sequence voltage and zero-axis crossing time Tx2 and Tx3, respectively taking the average value of Tx2 and Tx3 as Tx1 (when unbalanced voltage does not exist before a fault, taking Tx1 as Tx3), and correcting the zero sequence voltage abnormal motion time as Tx 1.
Optionally, determining a fault position according to the bus side zero sequence voltage transaction time and the line end zero sequence voltage transaction time includes:
determining a fault line and a fault section according to the preliminary fault line selection and positioning result;
and determining the position of a fault point according to the fault line and the fault section and based on the corrected voltage variation time of the tail end of the line and the corrected voltage variation time of the side of the bus.
Specifically, step S4: and the edge agent module fuses the zero sequence voltage monitoring modules at all the tail ends and the wave recording data of the sensors on the lines to accurately complete line selection and positioning.
The bus side edge proxy module positions the bus side edge proxy module as an x outgoing line fault according to the line selection result of the step S2, and initially completes the positioning of the section between the xm sensor and the xn sensor; the bus side edge proxy module can accurately calculate the position of the fault point according to the recording waveform which is fed back by the zero sequence voltage change time T01 and the zero sequence voltage monitoring module at the tail end of the x outgoing line and the zero sequence voltage change time Tx1 which are monitored by the bus side edge proxy module per se, and according to the distance L of the installation position of the zero sequence voltage monitoring module of the bus in the system model and the time of sudden change of the zero sequence current of the upstream and the downstream of the fault point which are respectively marked as Txm and Txn.
According to the power distribution network ground fault positioning method based on wide area synchronization, the sensor units on the line are started after the bus side edge proxy terminal detects zero sequence voltage abnormal operation, the sensor misoperation and failure conditions are avoided, and the equipment reliability is improved; the bus side edge proxy terminal, the sensor unit and the line tail end zero sequence voltage detection device are all provided with a GPS time synchronization module, the sampling frequency reaches 256 points per cycle, the sampling precision is high, the transient process can be accurately captured, and line selection and section positioning are completed before interference of an arc suppression coil; the method comprises the following steps of accurately calculating the abnormal time of zero sequence voltage and zero sequence current by fusing a line sensor and a line tail end zero sequence voltage detection device according to the principle that the conduction time of the zero sequence voltage and the conduction time of the zero sequence current on a line are different, and obtaining the position of a fault point; greatly reduces the operation and maintenance cost and has wide application and popularization range.
A second embodiment of the present invention provides a distribution network ground fault positioning device based on wide area synchronization, as shown in fig. 2, the device includes:
the bus edge proxy module is used for acquiring bus side zero sequence voltage transaction time according to bus side voltage transaction;
the circuit zero sequence voltage monitoring module is used for acquiring the zero sequence voltage abnormal operation time of the tail end of the circuit according to the voltage abnormal operation of the tail end of the circuit;
and the bus edge proxy module is also used for determining the fault position according to the bus side zero sequence voltage transaction time and the line tail end zero sequence voltage transaction time.
The method avoids the conditions of sensor misoperation and failure, improves the reliability of the equipment, and simultaneously can transmit the waveform of the recorded voltage back to the bus side edge proxy module through the zero sequence voltage monitoring module at the tail end of each outgoing line so as to realize the accurate positioning of fault points.
Optionally, in an optional embodiment of the present invention, the bus edge proxy module is specifically configured to:
when the voltage on the bus side varies, acquiring the voltage variation time of the bus side;
intercepting a specified number of bus side voltage cycles before and after the bus side voltage transaction moment, and integrating the bus side voltage cycles into a bus side zero sequence voltage waveform;
performing linear fitting on the bus side zero sequence voltage waveform based on the bus side voltage variation moment;
and correcting the voltage abnormal movement time of the bus side according to the linear fitting result.
When the bus edge agent module detects bus voltage abnormal motion, according to detected abnormal motion time T01, intercepting the first 4 cycles and the last 8 cycles of voltage waveforms at the time, wherein the sampling frequency is 256 points per cycle, then merging the three-phase voltage waveforms into a zero-sequence voltage waveform, then respectively performing straight line fitting on the first 5 sampled data and the last 5 sampled data of T01 in the zero-sequence voltage waveform sampled data, respectively calculating the zero-sequence voltage and zero-axis crossing time as T02 and T03, taking the average value of T02 and T03 as T01 (when unbalanced voltage does not exist before a fault, taking T01 as T03), and correcting the zero-sequence voltage abnormal motion time as T01.
Optionally, in an optional embodiment of the present invention, the apparatus further comprises a sensor unit;
the bus edge agent module is used for starting the sensor units of the outgoing lines to record waves at the voltage abnormal moment of the bus side;
the bus edge agent module is also used for intercepting current cycles of a specified quantity before and after the bus side voltage abnormal moment and integrating the current cycles into a zero sequence current waveform;
and carrying out primary fault line selection and positioning based on the zero sequence current waveform.
Specifically, a bus side edge proxy module starts a sensor unit installed on each outgoing line to record waves, the starting time is t1, 4 first cycle current waveforms and 8 last cycle current waveforms at the moment are intercepted, the sampling frequency is 256 points of each cycle, the cycle current waveforms are combined into a zero sequence current waveform, sampling data of the last half cycle of t1 is obtained, the influence of an arc suppression coil can be avoided, the zero sequence current mutation direction is calculated, initial line selection and positioning are carried out according to the fact that the front and back zero sequence current directions of a fault point of a fault line are opposite, the zero sequence current mutation directions of the head ends of the fault line and a non-fault line are opposite, zero sequence current mutation time is recorded, and the upstream mutation time and the downstream mutation time of the fault point are respectively recorded as Txm and Txn.
Optionally, in an optional embodiment of the present invention, the line zero sequence voltage monitoring module is specifically used for
When the voltage variation of the tail end of the line is detected at the tail end of the outgoing line, the voltage variation moment of the tail end of the line is obtained;
intercepting a specified number of line tail end voltage cycles before and after the voltage transaction time of the line tail end, and integrating the line tail end voltage cycles into a line tail end zero sequence voltage waveform;
performing linear fitting on the zero sequence voltage waveform at the tail end of the line based on the voltage variation moment at the tail end of the line;
and correcting the voltage abnormal movement time of the tail end of the line according to the result of the linear fitting.
When voltage abnormal motion is detected by each outgoing line terminal zero sequence voltage monitoring module, according to the detected abnormal motion time Tx1, intercepting the first 4 cycle voltage waveforms and the last 8 cycle voltage waveforms (the sampling frequency is 256 points per cycle), merging the three-phase voltage waveforms into zero sequence voltage waveforms, respectively performing straight line fitting on the first 5 sampling data and the last 5 sampling data of Tx2 in the zero sequence voltage waveform sampling data, respectively calculating the zero-sequence voltage and zero-axis crossing time Tx2 and Tx3, respectively taking the average value of Tx2 and Tx3 as Tx1 (when unbalanced voltage does not exist before a fault, taking Tx1 as Tx3), and correcting the zero sequence voltage abnormal motion time as Tx 1.
Optionally, in an optional embodiment of the present invention, the bus edge agent module is specifically configured to determine a faulty line and a faulty section according to the preliminary fault line selection and location result;
and determining the position of a fault point according to the fault line and the fault section and based on the corrected voltage variation time of the tail end of the line and the corrected voltage variation time of the side of the bus.
The bus side edge proxy module positions the bus side edge proxy module as an x outgoing line fault according to the line selection result of the step S2, and initially completes the positioning of the section between the xm sensor and the xn sensor; the bus side edge proxy module can accurately calculate the position of the fault point according to the recording waveform which is fed back by the zero sequence voltage change time T01 and the zero sequence voltage monitoring module at the tail end of the x outgoing line and the zero sequence voltage change time Tx1 which are monitored by the bus side edge proxy module per se, and according to the distance L of the installation position of the zero sequence voltage monitoring module of the bus in the system model and the time of sudden change of the zero sequence current of the upstream and the downstream of the fault point which are respectively marked as Txm and Txn.
Due to the adoption of the technical scheme, the invention has the following advantages:
(1) the sensor units on the line are started after the bus side edge proxy terminal detects the zero sequence voltage abnormal operation, thereby avoiding the conditions of sensor misoperation and failure operation and improving the equipment reliability;
(2) the bus side edge proxy terminal, the sensor unit and the line tail end zero sequence voltage detection device are all provided with a GPS time synchronization module, the sampling frequency reaches 256 points per cycle, the sampling precision is high, the transient process can be accurately captured, and line selection and section positioning are completed before interference of an arc suppression coil;
(3) the principle that the conduction time of zero sequence voltage and zero sequence current on a line is different is adopted, and a line sensor and a line tail end zero sequence voltage detection device are fused to accurately calculate the abnormal time of the zero sequence voltage and the zero sequence current to obtain the position of a fault point.
(4) Greatly reduces the operation and maintenance cost and has wide application and popularization range.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered thereby.
Claims (4)
1. A power distribution network ground fault positioning method based on wide area synchronization is characterized by comprising the following steps:
acquiring zero sequence voltage transaction time of the bus side according to the voltage transaction of the bus side; the method comprises the following steps: when the voltage on the bus side varies, acquiring the voltage variation time of the bus side; intercepting a specified number of bus side voltage cycles before and after the bus side voltage transaction moment, and integrating the bus side voltage cycles into a bus side zero sequence voltage waveform; performing linear fitting on the bus side zero sequence voltage waveform based on the bus side voltage variation moment; correcting voltage variation time of the bus side according to a linear fitting result;
acquiring zero sequence voltage abnormal operation time of the tail end of the line according to the voltage abnormal operation of the tail end of the line; the method comprises the following steps: when the voltage variation of the tail end of the line is detected at the tail end of the outgoing line, the voltage variation moment of the tail end of the line is obtained; intercepting a specified number of line tail end voltage cycles before and after the voltage transaction time of the line tail end, and integrating the line tail end voltage cycles into a line tail end zero sequence voltage waveform; performing linear fitting on the zero sequence voltage waveform at the tail end of the line based on the voltage variation moment at the tail end of the line; correcting the voltage abnormal movement moment of the tail end of the line according to the result of linear fitting;
after obtaining the bus side zero sequence voltage transaction time according to the bus side voltage transaction, the method further comprises the following steps of recording waves of all outgoing lines:
arranging sensor units on each outgoing line in a subsection mode, and starting the sensor units of each outgoing line to record waves at the voltage abnormal moment of the bus side;
intercepting a specified number of current cycles before and after the voltage fluctuation moment of the bus side, and integrating the current cycles into a zero-sequence current waveform;
performing primary fault line selection and positioning based on the zero sequence current waveform;
and determining the fault position according to the bus side zero sequence voltage variation time and the line tail end zero sequence voltage variation time.
2. The method of claim 1, wherein: determining a fault position according to the bus side zero sequence voltage transaction time and the line tail end zero sequence voltage transaction time, wherein the fault position comprises the following steps:
determining a fault line and a fault section according to the preliminary fault line selection and positioning result;
and determining the position of a fault point according to the fault line and the fault section and based on the corrected voltage variation time of the tail end of the line and the corrected voltage variation time of the side of the bus.
3. A distribution network ground fault positioning device based on wide area synchronization, characterized in that the device includes:
the bus edge proxy module is used for acquiring bus side zero sequence voltage transaction time according to bus side voltage transaction;
the circuit zero sequence voltage monitoring module is used for acquiring the zero sequence voltage abnormal operation time of the tail end of the circuit according to the voltage abnormal operation of the tail end of the circuit; the zero sequence voltage monitoring module of the line is particularly used for
When the voltage variation of the tail end of the line is detected at the tail end of the outgoing line, the voltage variation moment of the tail end of the line is obtained;
intercepting a specified number of line tail end voltage cycles before and after the voltage transaction time of the line tail end, and integrating the line tail end voltage cycles into a line tail end zero sequence voltage waveform;
performing linear fitting on the zero sequence voltage waveform at the tail end of the line based on the voltage variation moment at the tail end of the line;
correcting the voltage abnormal movement moment of the tail end of the line according to the result of linear fitting;
the bus edge proxy module is also used for determining a fault position according to the bus side zero sequence voltage transaction time and the line tail end zero sequence voltage transaction time; the bus edge proxy module is specifically configured to:
when the voltage on the bus side varies, acquiring the voltage variation time of the bus side;
intercepting a specified number of bus side voltage cycles before and after the bus side voltage transaction moment, and integrating the bus side voltage cycles into a bus side zero sequence voltage waveform;
performing linear fitting on the bus side zero sequence voltage waveform based on the bus side voltage variation moment;
correcting voltage variation time of the bus side according to a linear fitting result;
the device further comprises a sensor unit;
the bus edge agent module is used for starting the sensor units of the outgoing lines to record waves at the voltage abnormal moment of the bus side;
the bus edge agent module is also used for intercepting current cycles of a specified quantity before and after the bus side voltage abnormal moment and integrating the current cycles into a zero sequence current waveform;
and carrying out primary fault line selection and positioning based on the zero sequence current waveform.
4. The apparatus of claim 3, wherein the bus edge agent module is specifically configured to determine a faulty line and a faulty section according to the preliminary fault routing and localization result;
and determining the position of a fault point according to the fault line and the fault section and based on the corrected voltage variation time of the tail end of the line and the corrected voltage variation time of the side of the bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910858615.0A CN110426606B (en) | 2019-09-11 | 2019-09-11 | Power distribution network ground fault positioning method and device based on wide area synchronization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910858615.0A CN110426606B (en) | 2019-09-11 | 2019-09-11 | Power distribution network ground fault positioning method and device based on wide area synchronization |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110426606A CN110426606A (en) | 2019-11-08 |
| CN110426606B true CN110426606B (en) | 2021-07-27 |
Family
ID=68418989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910858615.0A Active CN110426606B (en) | 2019-09-11 | 2019-09-11 | Power distribution network ground fault positioning method and device based on wide area synchronization |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110426606B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111257700B (en) * | 2020-03-31 | 2020-10-30 | 国网江苏省电力有限公司无锡供电分公司 | Power distribution network single-phase earth fault positioning device and method based on edge calculation |
| CN111579918B (en) * | 2020-04-13 | 2022-03-04 | 上海紫通信息科技有限公司 | Sampling synchronous correction method for transient recording type fault indicator |
| CN113311360B (en) * | 2021-05-28 | 2022-09-13 | 苏州银蕨电力科技有限公司 | Sectional type line grounding fault detection and isolation system and detection and isolation method thereof |
| CN113567806A (en) * | 2021-07-02 | 2021-10-29 | 上海思源光电有限公司 | Small current fault line selection method, system, terminal and medium |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104535883A (en) * | 2014-12-29 | 2015-04-22 | 北京四方继保自动化股份有限公司 | Small current grounding fault line selection method based on full-system grounding fault information |
| CN104808114A (en) * | 2015-05-04 | 2015-07-29 | 中国矿业大学 | Low-current grounding fault line selection method based on wide-area zero-sequence voltage distribution characteristics |
| US9369408B1 (en) * | 2014-01-31 | 2016-06-14 | Google Inc. | High performance and resilience in wide area networking |
| CN109188195A (en) * | 2018-08-17 | 2019-01-11 | 国网江苏省电力有限公司电力科学研究院 | A kind of distribution small current grounding fault localization method and system |
| CN109995145A (en) * | 2019-05-15 | 2019-07-09 | 国网湖北省电力有限公司电力科学研究院 | A kind of low-voltage network failure active analysis method based on intelligent distribution transformer terminals |
-
2019
- 2019-09-11 CN CN201910858615.0A patent/CN110426606B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9369408B1 (en) * | 2014-01-31 | 2016-06-14 | Google Inc. | High performance and resilience in wide area networking |
| CN104535883A (en) * | 2014-12-29 | 2015-04-22 | 北京四方继保自动化股份有限公司 | Small current grounding fault line selection method based on full-system grounding fault information |
| CN104808114A (en) * | 2015-05-04 | 2015-07-29 | 中国矿业大学 | Low-current grounding fault line selection method based on wide-area zero-sequence voltage distribution characteristics |
| CN109188195A (en) * | 2018-08-17 | 2019-01-11 | 国网江苏省电力有限公司电力科学研究院 | A kind of distribution small current grounding fault localization method and system |
| CN109995145A (en) * | 2019-05-15 | 2019-07-09 | 国网湖北省电力有限公司电力科学研究院 | A kind of low-voltage network failure active analysis method based on intelligent distribution transformer terminals |
Non-Patent Citations (2)
| Title |
|---|
| 基于广域同步测量技术定位间歇性单相接地故障的方法及应用;姚艳霞 等;《数字通信世界》;20181130;第199,256页 * |
| 基于时间和空间信息的间歇性单相接地故障检测和定位方法及应用;郭雷 等;《第三届智能电网会议论文集》;20181231;第272页第2栏第1行-273行第2栏第112行及图2 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110426606A (en) | 2019-11-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110426606B (en) | Power distribution network ground fault positioning method and device based on wide area synchronization | |
| US20190137556A1 (en) | Method and system for detecting and locating single-phase ground fault on low current grounded power-distribution network | |
| CN101943737B (en) | Single-phase earth fault diagnosis method and device | |
| CN102590700B (en) | Based on pole line fast fault locating method and the device of time synchronized | |
| US9874593B2 (en) | Decision support system for outage management and automated crew dispatch | |
| CN108333477B (en) | Photovoltaic access power distribution network fault positioning method and device based on synchronous timestamp | |
| CN109188195A (en) | A kind of distribution small current grounding fault localization method and system | |
| CN104950216A (en) | Waveform comparison based power distribution line fault positioning method | |
| CN207281225U (en) | Transient current harvester and power distribution network service cable line fault alignment system | |
| CN204177907U (en) | Distribution Network Frame ceases to be busy running status record ripple and fault diagnosis system | |
| CN103048589B (en) | Device time mark fault-tolerance processing method in grid fault diagnosis | |
| CN109733238B (en) | Fault detection method, device, storage medium and processor | |
| CN110824300A (en) | Edge computing system for power distribution network fault detection and positioning | |
| CN105044554A (en) | Power grid fault detection and diagnosis method | |
| CN105699789A (en) | Identification method of fault indicator installation phase sequence | |
| CN103675705A (en) | Method for redundancy check of currents of power battery | |
| CN116520093B (en) | High-voltage bus operation fault positioning method and device | |
| CN110843857A (en) | Fault detection and switching system for dual-machine hot standby ATO equipment | |
| CN104330708A (en) | Fault location method for wide area traveling wave signal below power grid | |
| CN103743963A (en) | Electric power system fault diagnosis method based on electrical quantity and state quantity | |
| CN111190098A (en) | Relay fault detection method and detection system | |
| CN106646130A (en) | Active power distribution network fault positioning method and system based on current polarity comparison | |
| CN106371018A (en) | Cell-terminal-voltage-estimation-based fault diagnosis method and equipment for vehicle power battery | |
| CN103901321A (en) | Method for locating grid fault source through power quality monitoring data and electric system | |
| CN101943738B (en) | Single-phase grounding distance measuring method and distance measuring device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |