CN111929538A - Power distribution network fault positioning method and system based on carrier communication - Google Patents
Power distribution network fault positioning method and system based on carrier communication Download PDFInfo
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- CN111929538A CN111929538A CN202011107089.3A CN202011107089A CN111929538A CN 111929538 A CN111929538 A CN 111929538A CN 202011107089 A CN202011107089 A CN 202011107089A CN 111929538 A CN111929538 A CN 111929538A
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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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- 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
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Abstract
The application relates to a power distribution network fault positioning method and system based on carrier communication, wherein the method comprises the following steps: monitoring zero sequence voltage and zero sequence current of a corresponding position by monitoring equipment, calculating transient reactive power of the corresponding position, modulating the calculated transient reactive power to form a carrier signal, and transmitting the carrier signal to other monitoring equipment in a power carrier communication mode; the monitoring equipment receives carrier signals sent by adjacent monitoring equipment, transient reactive power of the adjacent monitoring equipment is obtained according to the received carrier signals, the transient reactive power of the adjacent monitoring equipment is compared with the transient reactive power of the monitoring equipment, monitoring equipment on two sides of a fault point is obtained, and a fault interval is located. The power distribution network fault positioning method based on carrier communication achieves the effect of nearby data processing, reduces the workload of the main station, is high in data processing efficiency, does not need to erect a network again, and is simpler in implementation mode.
Description
Technical Field
The application relates to the technical field of power distribution network lines, in particular to a power distribution network fault positioning method and system based on carrier communication.
Background
The line fault of the power distribution network can directly influence the safe operation of the power distribution network, and how to quickly and accurately locate the fault of the power distribution network is the key point for ensuring the safe and stable operation of the power distribution network.
In the related technology, in order to quickly and accurately locate the fault of the power distribution network, the current and the voltage of different positions on a power distribution network line are monitored, then the obtained current and voltage of all the positions are sent to a master station, and after data processing is carried out by the master station in a unified manner, the fault interval of the power distribution network is located according to the current and voltage distribution conditions of different positions.
However, the method has many disadvantages, the current and the voltage on the power distribution network line are monitored, and then the current and the voltage are transmitted to the master station for data processing, the master station performs centralized processing on all current and voltage data, the information amount is large, the operation efficiency is low, main work is centralized on the master station, the workload of the master station is very large, and in addition, all data of monitoring equipment are transmitted to the master station through optical fibers, the optical fibers are required to be laid on a large scale for communication, and the cost is also very high.
Disclosure of Invention
The embodiment of the application provides a power distribution network fault positioning method and system based on carrier communication, and aims to solve the technical problems of low operation efficiency, large main station load and high optical fiber laying cost in fault positioning in the related technology.
In a first aspect, a method for positioning a fault of a power distribution network based on carrier communication is provided, which includes the steps of:
arranging a plurality of monitoring devices at different positions on a power distribution network line at intervals, and setting a working frequency band for each monitoring device to send signals and a working frequency band for receiving signals, so that each monitoring device only receives signals sent by adjacent monitoring devices;
monitoring zero sequence voltage and zero sequence current of a corresponding position by monitoring equipment, calculating transient reactive power of the corresponding position according to the monitored zero sequence voltage and zero sequence current, modulating the calculated transient reactive power according to a working frequency band of a signal transmitted by the monitoring equipment to form a carrier signal, and transmitting the carrier signal to other monitoring equipment in a power carrier communication mode;
the monitoring equipment receives carrier signals sent by adjacent monitoring equipment, transient reactive power of the adjacent monitoring equipment is obtained according to the received carrier signals, the transient reactive power of the adjacent monitoring equipment is compared with the transient reactive power of the monitoring equipment, monitoring equipment on two sides of a fault point is obtained, and a fault interval is located.
In some embodiments, the monitoring device includes a secondary fusion switch, and after obtaining the monitoring devices on both sides of the fault point and locating the fault interval, the method further includes the steps of:
selecting monitoring equipment with transient reactive power less than 0 from monitoring equipment on two sides of a fault point as monitoring equipment to be isolated;
and disconnecting the primary and secondary fusion switches of the monitoring equipment to be isolated to realize local nearby isolation.
In some embodiments, the step of setting the operating frequency band of each monitoring device for transmitting signals and the operating frequency band of each monitoring device for receiving signals includes:
full-duplex carrier communication is adopted, in the same carrier channel, the working frequency bands of signals sent by all monitoring devices are different, the working frequency bands of signals received by all monitoring devices are different, and the working frequency band of signals sent by the monitoring device adjacent to the monitoring device is located in the working frequency band of signals received by the monitoring device.
In some embodiments, the monitoring device includes a receiving loop, and the receiving loop of the monitoring device includes at least two filters, and the operating frequency band of each filter is different;
the receiving loops of two adjacent monitoring devices select to use different filters.
In some embodiments, the step of comparing the transient reactive power of the adjacent monitoring devices with the transient reactive power of the monitoring device to obtain the monitoring devices on both sides of the fault point includes:
the monitoring equipment is set as second monitoring equipment, and the transient state reactive power of the second monitoring equipment is Q2The monitoring equipment positioned at the upstream of the monitoring equipment in two adjacent monitoring equipment is first monitoring equipment, and the transient reactive power of the first monitoring equipment is Q1The monitoring device positioned at the downstream of the monitoring device in the two adjacent monitoring devices is a third monitoring device, and the transient reactive power of the third monitoring device is Q3；
If Q2Greater than zero and Q1If the fault is less than zero, a fault occurs between the first monitoring device and the second monitoring device, and the monitoring devices on two sides of the fault point are the first monitoring device and the second monitoring device;
if Q2Less than zero and Q3If the fault point is larger than zero, a fault occurs between the second monitoring device and the third monitoring device, and the monitoring devices on the two sides of the fault point are the second monitoring device and the third monitoring device.
In some embodiments, when the monitoring device monitors the zero-sequence voltage and the zero-sequence current of the corresponding position, the method further includes the steps of: monitoring traveling wave signals on a power distribution network line by monitoring equipment;
after the fault interval is positioned, the method further comprises the following steps:
and calculating the position of the fault point according to the traveling wave signals monitored by the monitoring equipment on the two sides of the fault point by adopting a traveling wave method.
In a second aspect, a power distribution network fault location system based on carrier communication is provided, including:
a plurality of monitoring facilities, it is used for the interval to lay the different positions on the distribution network line, monitoring facilities includes:
the monitoring module is used for monitoring zero sequence voltage and zero sequence current of a corresponding position and calculating transient reactive power of the corresponding position according to the monitored zero sequence voltage and zero sequence current;
the transmitting loop is used for modulating the transient reactive power obtained by calculation according to the working frequency band of the signal transmitted by the monitoring equipment to form a carrier signal and transmitting the carrier signal to other monitoring equipment in a power carrier communication mode;
and the receiving loop is used for receiving the carrier signals sent by the adjacent monitoring equipment, obtaining the transient reactive power of the adjacent monitoring equipment according to the received carrier signals, and comparing the transient reactive power of the adjacent monitoring equipment with the transient reactive power of the monitoring equipment to obtain the monitoring equipment on two sides of the fault point, namely positioning the fault interval.
In some embodiments, the receiving loop includes at least two filters, each filter has a different operating frequency band, and the receiving loops of two adjacent monitoring devices use different filters.
In some embodiments, the receive loop comprises a coupler, a first filter, a second filter, a switch, a demodulator, and a comparator;
the coupler is used for receiving carrier signals sent by all monitoring devices; the switch is used for alternatively connecting the first filter and the second filter into a line; the first filter or the second filter is used for filtering the carrier signals sent by all the monitoring devices to obtain the carrier signals sent by the adjacent monitoring devices; the demodulator is used for demodulating the carrier signal sent by the adjacent monitoring equipment to obtain the transient reactive power of the adjacent monitoring equipment; the comparator is used for comparing the transient reactive power of the adjacent monitoring equipment with the transient reactive power of the monitoring equipment to obtain the monitoring equipment on two sides of the fault point, namely, a fault interval is positioned.
In some embodiments, the monitoring module is further configured to monitor a traveling wave signal on the power distribution network line by the monitoring device, and calculate a position of the fault point according to the traveling wave signal monitored by the monitoring device on both sides of the fault point after the fault interval is located.
The beneficial effect that technical scheme that this application provided brought includes: the method has the advantages of realizing the nearby data processing, reducing the workload of the main station, having high data processing efficiency, needing no network re-erection and having simpler realization mode.
The embodiment of the application provides a power distribution network fault positioning method based on carrier communication, monitored current and voltage data are directly subjected to data processing by monitoring equipment, the monitoring equipment performs data interaction in a power carrier communication mode, each monitoring equipment only receives signals sent by adjacent monitoring equipment by setting the working frequency band of the monitoring equipment, and fault sections can be positioned by comparison, the monitoring equipment can complete data processing and fault positioning without transmitting the signals to a main station, so that nearby data processing is realized, the workload of the main station is reduced, data processing work is distributed to a plurality of monitoring equipment, the data volume processed by each monitoring equipment is not large, the processing efficiency is higher, all the monitoring equipment performs data interaction in a power carrier communication mode, and a power line is directly utilized for data transmission, and a network does not need to be erected again, and the implementation mode is simpler.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a power distribution network fault location method based on carrier communication according to an embodiment of the present application;
fig. 2 is a network topology diagram of a power distribution network according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a power distribution network according to an embodiment of the present application;
fig. 4 is a flowchart illustrating specific steps of power distribution network fault location based on carrier communication according to an embodiment of the present disclosure;
fig. 5 is a block diagram of a monitoring device according to an embodiment of the present disclosure;
fig. 6 is a block diagram of a receiving circuit according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, an embodiment of the present application provides a power distribution network fault location method based on carrier communication, which includes the steps of:
s1: arranging a plurality of monitoring devices at different positions on a power distribution network line at intervals, and setting a working frequency band for each monitoring device to send signals and a working frequency band for receiving signals, so that each monitoring device only receives signals sent by adjacent monitoring devices;
s2: monitoring zero sequence voltage and zero sequence current of a corresponding position by monitoring equipment, calculating transient reactive power of the corresponding position according to the monitored zero sequence voltage and zero sequence current, modulating the calculated transient reactive power according to a working frequency band of a signal transmitted by the monitoring equipment to form a carrier signal, and transmitting the carrier signal to other monitoring equipment in a power carrier communication mode;
s3: the monitoring equipment receives carrier signals sent by adjacent monitoring equipment, transient reactive power of the adjacent monitoring equipment is obtained according to the received carrier signals, the transient reactive power of the adjacent monitoring equipment is compared with the transient reactive power of the monitoring equipment, monitoring equipment on two sides of a fault point is obtained, and a fault interval is located. The monitoring devices on both sides of the fault point are to be understood here as the monitoring devices closest to the fault point.
In the power distribution network fault location method based on carrier communication of the embodiment of the application, monitored current and voltage data are directly processed by monitoring equipment, data interaction is carried out between the monitoring equipment in a power carrier communication mode, each monitoring equipment only receives signals sent by adjacent monitoring equipment by setting the working frequency band of the monitoring equipment, fault sections can be located by comparison, data processing and fault location can be completed by the monitoring equipment without transmission to a main station, so that nearby data processing is realized, the working load of the main station is reduced, data processing work is distributed to a plurality of monitoring equipment, the data volume processed by each monitoring equipment is not large, the processing efficiency is higher, moreover, all the monitoring equipment carries out data interaction in a power carrier communication mode, and power lines are directly utilized for data transmission, and a network does not need to be erected again, and the implementation mode is simpler.
Furthermore, in this embodiment of the present application, the monitoring device includes a secondary fusion switch, and after the monitoring devices on both sides of the fault point are obtained and the fault interval is located, the method further includes the steps of:
selecting monitoring equipment with transient reactive power less than 0 from monitoring equipment on two sides of a fault point as monitoring equipment to be isolated;
and disconnecting the primary and secondary fusion switches of the monitoring equipment to be isolated to realize local nearby isolation.
In the embodiment of the application, after locating out the fault section, the monitoring facilities that transient state reactive power is less than 0 keep apart through a secondary fusion switch, a secondary fusion switch of other monitoring facilities still keeps closing, thereby realize keeping apart on the spot, keep apart nearby, here keep apart on the spot and understand to need not through remote control, self realizes the isolation on the spot, can find the fault section fast, the easy access, here is kept apart on the spot and understands to be the fault section of keeping apart for the minimum fault section, in the maintenance process, can reduce the power failure region.
Further, in this embodiment of the present application, before the monitoring device monitors the zero-sequence voltage and the zero-sequence current of the corresponding position, the method further includes the steps of:
the change of the zero sequence voltage is used as a starting condition for fault monitoring;
when the zero sequence voltage changes, the monitoring equipment is started through the zero sequence voltage to start monitoring the zero sequence voltage and the zero sequence current of the corresponding position.
Further, in step S1, the step of setting the operating frequency band of the signal transmitted and the operating frequency band of the signal received by each monitoring device includes:
full-duplex carrier communication is adopted, in the same carrier channel, the working frequency bands of signals sent by all monitoring devices are different, the working frequency bands of signals received by all monitoring devices are different, and the working frequency band of signals sent by the monitoring device adjacent to the monitoring device is located in the working frequency band of signals received by the monitoring device.
Specifically, in the embodiment of the present application, in order to implement that each monitoring device only receives a signal sent by an adjacent monitoring device, the monitoring device includes a receiving loop, and the receiving loop of the monitoring device includes at least two filters, and the operating frequency bands of each filter are different; the receiving loops of two adjacent monitoring devices select to use different filters.
Referring to the network topology of the distribution network shown in fig. 2, a plurality of monitoring devices, which are respectively identified as A, B, B1, B2, C, C1, D, E, E1 and F, are distributed on the distribution network, and two filters are respectively identified as a first filter and a second filter, so that A, B1 and C, E use the second filter, and B, B2, C1, D, E1 and F use the first filter.
In the embodiment of the present application, the working frequency range of the first filter is 100 to 275KHZ, the working frequency range of the second filter is 325 to 500KHZ, and in order to realize that each monitoring device only receives signals sent by adjacent monitoring devices, in practical application, the working frequency range of each monitoring device for sending signals and the working frequency range of each receiving signal need to be set according to the number and the positions of the arranged monitoring devices.
Specifically, the frequency band of the A sending signal is 100-150 KHZ, the frequency band of the A receiving signal is 325-500 KHZ, the frequency band of the B sending signal is 325-375 KHZ, the frequency band of the B receiving signal is 100-275 KHZ, the frequency band of the C sending signal is 150-200 KHZ, the frequency band of the C receiving signal is 325-500 KHZ, the frequency band of the B1 sending signal is 200-250 KHZ, the frequency band of the B1 receiving signal is 325-500 KHZ and the like.
Through the setting of the frequency band, B can receive the signals sent by the adjacent monitoring devices A, C and B1, but cannot receive the signals sent by other monitoring devices, so that each monitoring device can only receive the signals sent by the adjacent monitoring devices, and cannot receive the signals sent by other monitoring devices.
In practical application, considering that attenuation exists in power line transmission signals, the communication distance is limited, even if the working frequency bands set by two monitoring devices far away are the same, communication can be carried out only in the range of the monitoring devices near the monitoring devices, and the judgment result cannot be influenced.
Further, in step S3, the step of comparing the transient reactive power of the adjacent monitoring devices with the transient reactive power of the monitoring devices to obtain the monitoring devices on both sides of the fault point includes:
the monitoring equipment is set as second monitoring equipment, and the transient state reactive power of the second monitoring equipment is Q2The monitoring equipment positioned at the upstream of the monitoring equipment in two adjacent monitoring equipment is first monitoring equipment, and the transient reactive power of the first monitoring equipment is Q1(ii) a The monitoring equipment positioned at the downstream of the monitoring equipment in the two adjacent monitoring equipment is third monitoring equipment, and the transient reactive power of the third monitoring equipment is Q3；
If Q2Greater than zero and Q1If the fault is less than zero, a fault occurs between the first monitoring device and the second monitoring device, and the monitoring devices on two sides of the fault point are the first monitoring device and the second monitoring device;
if Q2Less than zero and Q3If the fault point is larger than zero, a fault occurs between the second monitoring device and the third monitoring device, and the monitoring devices on the two sides of the fault point are the second monitoring device and the third monitoring device.
When a single-phase earth fault occurs in a power distribution network line, a transient reactive power method is adopted for judgment, and then the transient reactive power Q of monitoring equipment in a section upstream of a fault point is less than 0, which indicates that the transient power flows to a bus from the line; transient reactive power Q of monitoring equipment of the non-fault line and the downstream section of the fault line is larger than 0, the transient power is shown to flow to the line from the bus, and the fault point is located in the section with opposite reactive power directions on two sides.
Referring to the schematic diagram of the power distribution network structure shown in fig. 3, the power distribution network includes three power distribution lines, one end of each power distribution line is connected to a bus, and the other end is connected to a load, in the diagram, a monitoring device is uniformly distributed at each switch position, and a direction of a transient reactive power Q corresponding to each monitoring device is shown in the figure, because in this example, a power distribution network fault occurs between the monitoring device 10 and the monitoring device 11 on the second power distribution line, the transient reactive power Q of the monitoring device 10 and the monitoring device 2 on the second power distribution line upstream of a fault point is less than 0, the transient reactive power Q of the monitoring device 11 on the second power distribution line downstream of the fault point is greater than 0, and the transient reactive power Q of the monitoring devices of all branches of the second power distribution line is also greater than 0, such as the; transient state reactive power Q of all monitoring devices on the first distribution line and the third distribution line is also greater than 0, namely transient state reactive power Q of monitoring device 1, monitoring device 4, monitoring device 5, monitoring device 6, monitoring device 7 and monitoring device 8 on the first distribution line is greater than 0, and transient state reactive power Q of monitoring device 3 and monitoring device 14 on the third distribution line is also greater than 0. Therefore, the fault section can be quickly located by the directional distribution of the transient reactive power Q of the monitoring device, which occurs between the monitoring device 10 and the monitoring device 11.
It should be noted that, if a fault point occurs in a T-type branch, for example, the monitoring device 1, the monitoring device 4, and the monitoring device 5, and an intersecting node of the three monitoring devices is T, at this time, the transient reactive power Q of the monitoring device 1 is less than 0, and the transient reactive power Q of the monitoring device 4 and the monitoring device 5 is greater than 0, at this time, the located fault interval should be a T-type interval, that is, the fault interval is between the monitoring device 1 and the node T, between the monitoring device 4 and the node T, or between the monitoring device 5 and the node T, and then, the specific position of the fault point in the T-type interval is determined by a traveling wave method.
In practical application, in order to avoid the occurrence of the T-shaped interval, the monitoring device closest to the main road on the branch road may be set at a position very close to the main road, that is, the monitoring device 4 is very close to the node T, at this time, it may be considered that a fault point does not occur between the node T and the monitoring device 4, the located fault interval is between the monitoring device 1 and the monitoring device 5, and then the specific position of the fault point is found according to the traveling wave signals of the two monitoring devices, which is simpler.
Further, in this embodiment of the present application, when the monitoring device monitors the zero sequence voltage and the zero sequence current of the corresponding position, the method further includes the steps of:
monitoring traveling wave signals on a power distribution network line by monitoring equipment;
after the fault interval is positioned, the method further comprises the following steps:
and calculating the position of the fault point according to the traveling wave signals monitored by the monitoring equipment on the two sides of the fault point by adopting a traveling wave method.
According to the power distribution network fault location method based on carrier communication, after the fault section is located, the specific position of the fault point is located through a traveling wave method, the fault section can be found out quickly, the fault point can be located more accurately, and location accuracy is higher.
Referring to fig. 4, the specific steps of the power distribution network fault location based on carrier communication provided by the embodiment of the present application include:
a1: arranging a plurality of monitoring devices at different positions on a power distribution network line at intervals, and setting a working frequency band for each monitoring device to send signals and a working frequency band for receiving signals, so that each monitoring device only receives signals sent by adjacent monitoring devices;
a2: the change of the zero sequence voltage is used as a starting condition for fault monitoring, and when the zero sequence voltage changes, the monitoring equipment is started through the zero sequence voltage;
a3: monitoring zero sequence voltage, zero sequence current and traveling wave signals of corresponding positions by monitoring equipment, and calculating transient reactive power of the corresponding positions according to the monitored zero sequence voltage and zero sequence current;
a4: modulating the transient reactive power obtained by calculation according to the working frequency band of the signal sent by the monitoring equipment to form a carrier signal, and sending the carrier signal to other monitoring equipment in a power carrier communication mode;
a5: the monitoring equipment receives carrier signals sent by adjacent monitoring equipment, transient reactive power of the adjacent monitoring equipment is obtained according to the received carrier signals, and the transient reactive power of the adjacent monitoring equipment is compared with the transient reactive power of the monitoring equipment to obtain monitoring equipment on two sides of a fault point, namely a fault interval is positioned;
a6: and calculating the position of the fault point according to the traveling wave signals monitored by the monitoring equipment on the two sides of the fault point by adopting a traveling wave method.
Referring to fig. 5, an embodiment of the present application further provides a power distribution network fault location system based on carrier communication, including a plurality of monitoring devices, where the monitoring devices are used to be arranged at different positions on a power distribution network line at intervals.
The monitoring device comprises a monitoring module, a sending loop and a receiving loop.
The monitoring module is used for monitoring zero sequence voltage and zero sequence current of corresponding positions and calculating transient reactive power of the corresponding positions according to the monitored zero sequence voltage and zero sequence current;
the transmitting loop is used for modulating the transient reactive power obtained by calculation according to the working frequency band of the signal transmitted by the monitoring equipment to form a carrier signal and transmitting the carrier signal to other monitoring equipment in a power carrier communication mode;
the receiving circuit is used for receiving the carrier signals sent by the adjacent monitoring equipment, obtaining the transient reactive power of the adjacent monitoring equipment according to the received carrier signals, and comparing the transient reactive power of the adjacent monitoring equipment with the transient reactive power of the monitoring equipment to obtain the monitoring equipment on two sides of a fault point, namely positioning a fault interval.
In the power distribution network fault location system based on carrier communication of the embodiment of the application, monitored current and voltage data are directly processed by monitoring equipment, data interaction is carried out between the monitoring equipment in a power carrier communication mode, each monitoring equipment only receives signals sent by adjacent monitoring equipment by setting the working frequency band of the monitoring equipment, and fault sections can be located by comparison, data processing and fault location can be completed by the monitoring equipment without transmission to a main station, so that nearby data processing is realized, the working load of the main station is reduced, data processing work is distributed to a plurality of monitoring equipment, the data volume processed by each monitoring equipment is not large, the processing efficiency is higher, moreover, all the monitoring equipment carries out data interaction in a power carrier communication mode, and power lines are directly utilized for data transmission, the network does not need to be built again, and the structure is simpler.
Specifically, in the embodiment of the present application, the receiving loop includes at least two filters, an operating frequency band of each filter is different, and filters used by receiving loops of two adjacent monitoring devices are different.
Referring to fig. 6, in an embodiment of the present application, the receiving loop includes a coupler, a first filter, a second filter, a switch, a demodulator, and a comparator.
The coupler is used for receiving carrier signals sent by all monitoring devices; the switch is used for alternatively connecting the first filter and the second filter into a line; the first filter or the second filter is used for filtering the carrier signals sent by all the monitoring devices to obtain the carrier signals sent by the adjacent monitoring devices; the demodulator is used for demodulating the carrier signal sent by the adjacent monitoring equipment to obtain the transient reactive power of the adjacent monitoring equipment; the comparator is used for comparing the transient reactive power of the adjacent monitoring equipment with the transient reactive power of the monitoring equipment to obtain the monitoring equipment on two sides of the fault point, namely, a fault interval is positioned.
Further, in the embodiment of the present application, the monitoring device is a second monitoring device, and the transient reactive power of the second monitoring device is Q2Middle position of two adjacent monitoring devicesThe monitoring equipment at the upstream of the monitoring equipment is first monitoring equipment, and the transient reactive power of the first monitoring equipment is Q1The monitoring device positioned at the downstream of the monitoring device in the two adjacent monitoring devices is a third monitoring device, and the transient reactive power of the third monitoring device is Q3；
If Q2Greater than zero and Q1If the fault is less than zero, a fault occurs between the first monitoring device and the second monitoring device, and the monitoring devices on two sides of the fault point are the first monitoring device and the second monitoring device;
if Q2Less than zero and Q3If the fault point is larger than zero, a fault occurs between the second monitoring device and the third monitoring device, and the monitoring devices on the two sides of the fault point are the second monitoring device and the third monitoring device.
Furthermore, in this embodiment, the monitoring module is further configured to monitor a traveling wave signal on the power distribution network line by the monitoring device, and after the fault section is located, calculate a position of the fault point according to the traveling wave signal monitored by the monitoring device on both sides of the fault point.
The distribution network fault location system based on carrier communication of this application embodiment is after fixing a position trouble interval, still fixes a position the concrete position of fault point through the traveling wave method, not only can find out the trouble interval fast, can pinpoint fault point moreover more, and positioning accuracy is higher.
Furthermore, in this embodiment, the monitoring device further includes a secondary fusion switch, where the secondary fusion switch is used to perform disconnection operation when the monitoring device is a monitoring device on both sides of a fault point and the transient reactive power is less than 0, so as to implement local nearby isolation.
In the embodiment of the application, owing to set up the one-time and two-time fusion switch, after the fault interval is out in the location, the monitoring facilities that transient state reactive power is less than 0 keep apart through the one-time and two-time fusion switch, the one-time and two-time fusion switch of other monitoring facilities still keeps closing, thereby realize keeping apart on the spot, keep apart nearby, here keep apart on the spot and understand to need not through remote control, self realizes keeping apart on the spot, can find the fault interval fast, convenient to overhaul, here keeps apart on the spot and understands to be the fault interval of isolation for the minimum fault interval, in the maintenance process, can reduce the power failure region.
It should be noted that the monitoring module of the embodiment of the present application includes a current sensor, a voltage sensor and a traveling wave current sensor, where the current sensor is used to monitor the zero sequence current of the corresponding position, the voltage sensor is used to monitor the zero sequence voltage of the corresponding position, and the traveling wave current sensor is used to monitor the traveling wave current of the corresponding position.
In the embodiment of the present application, the monitoring device is an integrated structural design, the transmitting loop and the receiving loop jointly form a carrier communication module, and the primary and secondary fusion switch, the monitoring module and the carrier communication module are all integrated together, and it can be understood that various sensors of the monitoring module and the carrier communication module are all integrated on the primary and secondary fusion switch.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A power distribution network fault positioning method based on carrier communication is characterized by comprising the following steps:
arranging a plurality of monitoring devices at different positions on a power distribution network line at intervals, and setting a working frequency band for each monitoring device to send signals and a working frequency band for receiving signals, so that each monitoring device only receives signals sent by adjacent monitoring devices;
monitoring zero sequence voltage and zero sequence current of a corresponding position by monitoring equipment, calculating transient reactive power of the corresponding position according to the monitored zero sequence voltage and zero sequence current, modulating the calculated transient reactive power according to a working frequency band of a signal transmitted by the monitoring equipment to form a carrier signal, and transmitting the carrier signal to other monitoring equipment in a power carrier communication mode;
the monitoring equipment receives carrier signals sent by adjacent monitoring equipment, transient reactive power of the adjacent monitoring equipment is obtained according to the received carrier signals, the transient reactive power of the adjacent monitoring equipment is compared with the transient reactive power of the monitoring equipment, monitoring equipment on two sides of a fault point is obtained, and a fault interval is located.
2. The method for locating the fault of the power distribution network based on the carrier communication according to claim 1, wherein the monitoring devices comprise a secondary fusion switch, and after the monitoring devices on both sides of the fault point are obtained and the fault interval is located, the method further comprises the following steps:
selecting monitoring equipment with transient reactive power less than 0 from monitoring equipment on two sides of a fault point as monitoring equipment to be isolated;
and disconnecting the primary and secondary fusion switches of the monitoring equipment to be isolated to realize local nearby isolation.
3. The method for locating the fault of the power distribution network based on the carrier communication according to claim 1, wherein the step of setting the working frequency band of the signal transmitted by each monitoring device and the working frequency band of the signal received by each monitoring device comprises:
full-duplex carrier communication is adopted, in the same carrier channel, the working frequency bands of signals sent by all monitoring devices are different, the working frequency bands of signals received by all monitoring devices are different, and the working frequency band of signals sent by the monitoring device adjacent to the monitoring device is located in the working frequency band of signals received by the monitoring device.
4. The method for locating the fault of the power distribution network based on the carrier communication as claimed in claim 1, wherein the monitoring device comprises a receiving loop, and the receiving loop of the monitoring device comprises at least two filters, and the operating frequency band of each filter is different;
the receiving loops of two adjacent monitoring devices select to use different filters.
5. The method according to claim 1, wherein the step of comparing the transient reactive power of the adjacent monitoring devices with the transient reactive power of the monitoring devices to obtain the monitoring devices on both sides of the fault point comprises:
the monitoring equipment is set as second monitoring equipment, and the transient state reactive power of the second monitoring equipment is Q2The monitoring equipment positioned at the upstream of the monitoring equipment in two adjacent monitoring equipment is first monitoring equipment, and the transient reactive power of the first monitoring equipment is Q1The monitoring device positioned at the downstream of the monitoring device in the two adjacent monitoring devices is a third monitoring device, and the transient reactive power of the third monitoring device is Q3；
If Q2Greater than zero and Q1If the fault is less than zero, a fault occurs between the first monitoring device and the second monitoring device, and the monitoring devices on two sides of the fault point are the first monitoring device and the second monitoring device;
if Q2Less than zero and Q3If the fault point is larger than zero, a fault occurs between the second monitoring device and the third monitoring device, and the monitoring devices on the two sides of the fault point are the second monitoring device and the third monitoring device.
6. The method for locating faults in a power distribution network based on carrier communication according to claim 1, wherein when the monitoring device monitors zero-sequence voltage and zero-sequence current of corresponding positions, the method further comprises the following steps: monitoring traveling wave signals on a power distribution network line by monitoring equipment;
after the fault interval is positioned, the method further comprises the following steps:
and calculating the position of the fault point according to the traveling wave signals monitored by the monitoring equipment on the two sides of the fault point by adopting a traveling wave method.
7. A distribution network fault location system based on carrier communication is characterized by comprising:
a plurality of monitoring facilities, it is used for the interval to lay the different positions on the distribution network line, monitoring facilities includes:
the monitoring module is used for monitoring zero sequence voltage and zero sequence current of a corresponding position and calculating transient reactive power of the corresponding position according to the monitored zero sequence voltage and zero sequence current;
the transmitting loop is used for modulating the transient reactive power obtained by calculation according to the working frequency band of the signal transmitted by the monitoring equipment to form a carrier signal and transmitting the carrier signal to other monitoring equipment in a power carrier communication mode;
and the receiving loop is used for receiving the carrier signals sent by the adjacent monitoring equipment, obtaining the transient reactive power of the adjacent monitoring equipment according to the received carrier signals, and comparing the transient reactive power of the adjacent monitoring equipment with the transient reactive power of the monitoring equipment to obtain the monitoring equipment on two sides of the fault point, namely positioning the fault interval.
8. A carrier communication based fault location system for a power distribution network as claimed in claim 7, wherein:
the receiving loop comprises at least two filters, the working frequency range of each filter is different, and the filters used by the receiving loops of two adjacent monitoring devices are different.
9. A carrier communication based power distribution network fault location system as defined in claim 8, wherein the receive loop includes a coupler, a first filter, a second filter, a switch, a demodulator, and a comparator;
the coupler is used for receiving carrier signals sent by all monitoring devices; the switch is used for alternatively connecting the first filter and the second filter into a line; the first filter or the second filter is used for filtering the carrier signals sent by all the monitoring devices to obtain the carrier signals sent by the adjacent monitoring devices; the demodulator is used for demodulating the carrier signal sent by the adjacent monitoring equipment to obtain the transient reactive power of the adjacent monitoring equipment; the comparator is used for comparing the transient reactive power of the adjacent monitoring equipment with the transient reactive power of the monitoring equipment to obtain the monitoring equipment on two sides of the fault point, namely, a fault interval is positioned.
10. A carrier communication based fault location system for a power distribution network as claimed in claim 7, wherein:
and the monitoring module is also used for monitoring traveling wave signals on the power distribution network line by monitoring equipment and calculating the position of a fault point according to the traveling wave signals monitored by the monitoring equipment on two sides of the fault point after the fault interval is positioned.
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