CN113036731B - Point-to-point communication power distribution network feeder fault isolation method and self-healing system - Google Patents

Point-to-point communication power distribution network feeder fault isolation method and self-healing system Download PDF

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CN113036731B
CN113036731B CN202110448061.4A CN202110448061A CN113036731B CN 113036731 B CN113036731 B CN 113036731B CN 202110448061 A CN202110448061 A CN 202110448061A CN 113036731 B CN113036731 B CN 113036731B
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edge gateway
sectionalizer
fault
point
instruction
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CN113036731A (en
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石晶
李�昊
陈红坤
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Wuhan University WHU
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Wuhan University WHU
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02—Details
    • H02H3/06—Details with automatic reconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H02J13/00022—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using wireless data transmission
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • 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
    • Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
    • 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
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)

Abstract

The invention relates to a fault isolation method and a self-healing system for a feeder line of a power distribution network for point-to-point communication, which are characterized in that an edge gateway is arranged at each switching station on the feeder line of the power distribution network and is used for controlling the opening or closing of a switching element arranged at the corresponding switching station according to the condition of receiving an instruction from an adjacent edge gateway; the method comprises the following steps: when a fault occurs, if a switching station corresponding to the edge gateway is provided with a recloser, the recloser is disconnected, otherwise, a locking instruction is sent to the adjacent edge gateway on one side; judging the section where the fault point is located according to whether the locking instruction is received from the adjacent gateway or not and controlling the locking of the sectionalizers of the sections without the fault point; and controlling the sectionalizer of the section where the fault point is located to close the recloser in a fault-free state and realize the isolation of the fault point. The point-to-point communication mode between adjacent edge computing gateways is utilized to carry out open/close control on a recloser and a sectionalizer on a feeder line of the power distribution network, so as to solve the technical problems in the related technology.

Description

Point-to-point communication power distribution network feeder fault isolation method and self-healing system
Technical Field
The invention relates to the technical field of distribution automation, in particular to a fault isolation method and a self-healing system for a feeder line of a power distribution network in point-to-point communication.
Background
The distribution network (system) is located at the end of the power network (system), is the part of the power network directly connected with dispersed users, and is the part with the most close relation to social life. The power distribution network plays an important role in distributing power and is a key link influencing the power supply service level. At present, the degree of automation of a domestic power distribution network is not high, when a line fault occurs, the fault is isolated by the action of a 10KV/35KV outgoing line protection device of a transformer substation, and the power failure range is large.
The research of the distribution network automation technology aims to solve the technical problems of automatic fault identification, positioning, automatic isolation and the like of an electric power system, and better system performance is obtained by quickly clearing faults and recovering power supply, thereby playing an important role in ensuring the smoothness of power utilization of users and the stability of power transmission.
In the related art, centralized feeder automation, or a voltage-time type sectionalizer-recloser mode or a pulse technology type sectionalizer-recloser mode is adopted to solve the problem of automatic fault isolation. However, the centralized feeder automation mode requires the participation of a distribution network master station system, the protection action time is long, and generally all sectionalizers need to be replaced by more expensive circuit breakers; the sectionalizer-recloser mode requires multiple reclosings of a breaker at the outlet of the transformer substation, and the reclosings may be superposed on a circuit with a permanent fault, so that the impact on a system is large, and the damage to switching devices such as the reclosings is caused. In addition, due to the difficulty of arranging optical fibers in partial areas and high construction cost, the communication distance of the communication cable is short, the anti-electromagnetic interference capability is poor, and a low-cost and high-efficiency solution of distribution automation is lacked in the related art.
Disclosure of Invention
The embodiment of the invention provides a fault isolation method and a self-healing system for a feeder line of a power distribution network in point-to-point communication, which are used for controlling the opening/closing of a recloser and a sectionalizer on the feeder line of the power distribution network in a point-to-point communication mode between adjacent edge computing gateways so as to solve the technical problems in the related technology.
In one aspect, a method for isolating a fault of a feeder line of a power distribution network based on point-to-point communication is provided, where the point-to-point communication consists in that a command is transmitted through direct data exchange between adjacent edge gateways without being relayed by a network server, where the edge gateway is disposed at each switching station on the feeder line of the power distribution network, and is configured to control opening or closing of a switching element disposed at the corresponding switching station according to a condition that the command is received from the adjacent edge gateway, and the switching element includes a recloser and a sectionalizer; the fault isolation method for the feeder line of the power distribution network comprises the following steps: when a fault occurs, if a switching station corresponding to the edge gateway is provided with a recloser, the recloser is disconnected, otherwise, a locking instruction is sent to the adjacent edge gateway on one side; judging the section where the fault point is located according to whether the locking instruction is received from the adjacent gateway or not and controlling the locking of the sectionalizers of the sections without the fault point; and controlling the sectionalizer of the section where the fault point is located to close the recloser in a fault-free state and realize the isolation of the fault point.
In some embodiments, the recloser is configured on a feeder of a first switching station at the outlet end of the substation; the sectionalizer is configured on a feeder line of each switch station; the edge gateways arranged on different switch stations have an upper-level and lower-level relation, and the edge gateway closer to the recloser is the upper level of the edge gateway farther from the recloser; the method for sending the blocking instruction to the adjacent edge gateway on one side and judging the section where the fault point is located according to whether the blocking instruction is received from the adjacent gateway comprises the following steps: sending a locking instruction to an adjacent upper-level edge gateway; when a locking instruction sent by an adjacent lower-level edge gateway is received, locking of the sectionalizer of the corresponding switching station is kept; and when the locking instruction sent by the adjacent lower-level edge gateway is not received after the preset time delay, the sectionalizer corresponding to the switching station is disconnected.
In some embodiments, controlling the sectionalizer of the section where the fault point is located to close the recloser in a fault-free state and to achieve the isolation of the fault point includes the steps of: when one sectionalizer is disconnected, the edge gateway corresponding to the disconnected sectionalizer sends a closing instruction to an adjacent superior edge gateway and sends a tripping instruction to an adjacent inferior edge gateway; when a closing instruction sent by an adjacent lower-level edge gateway is received, if a recloser is arranged at a corresponding switching station, the recloser is closed, otherwise, the closing instruction is continuously forwarded to the upper-level edge gateway; and the edge gateway receiving the tripping instruction controls the corresponding sectionalizer to be disconnected.
In some embodiments, the sectionalizer further comprises an inbound side sectionalizer configured at an inbound side of the switch site feeder and an outbound side sectionalizer configured at an outbound side of the switch site feeder, and normal power flows from the feeder to the switch site through the inbound side sectionalizer and from the switch site to the feeder through the outbound side sectionalizer; the judging the section where the fault point is located according to whether the blocking instruction is received from the adjacent gateway or not comprises the following steps: when a locking instruction sent by an adjacent lower-level edge gateway is received, locking of the sectionalizer of the corresponding switching station is kept; and when the locking instruction sent by the adjacent lower-level edge gateway is not received after the preset time delay, only disconnecting the segmentation device of the outbound end of the corresponding switch station.
In some embodiments, the edge gateway that receives the trip instruction controls the corresponding segmenter to be disconnected, specifically: and when the tripping instruction is received, only the corresponding inbound terminal sectionalizer is controlled to be disconnected.
In some embodiments, after controlling the sectionalizer of the section where the fault point is located to close the recloser in a fault-free state and achieve the isolation of the fault point, the method further comprises the following steps: and the edge gateway controls the interconnection switch on the feeder line of the power distribution network according to the switch closing instruction so as to realize the recovery of power supply in the non-fault section.
In some embodiments, the edge gateway controls a tie switch on a feeder of the distribution network according to a switch closing command to recover power supply of a non-fault section, and the method comprises the following steps: the edge gateway receiving the tripping command sends a switch closing command to an adjacent subordinate edge gateway; and if the switch station corresponding to the edge gateway receiving the switch closing instruction is provided with an interconnection switch, closing the interconnection switch to realize the recovery of power supply in the non-fault section, and otherwise, continuously forwarding the switch closing instruction to the adjacent lower-level edge gateway.
On the other hand, the point-to-point communication mode-based power distribution network feeder line fault isolation self-healing system is further provided, and the point-to-point communication is characterized in that the transmission of the instruction is carried out through direct data exchange between adjacent edge gateways without the transfer of a network server; the system comprises: the switching element is configured on a switching station on the substation feeder line and used for opening or closing according to the control of the instruction so as to cut off or conduct the section feeder line controlled by the switching element; the edge gateway is arranged at each switching station on the feeder line of the power distribution network and is used for controlling the opening or closing of the switching elements arranged at the corresponding switching stations according to the condition of receiving instructions from the adjacent edge gateway; the switching element comprises a recloser and a sectionalizer; the edge gateway is configured to: when a fault occurs, if the edge gateway is provided with a recloser corresponding to the switching station, the recloser is disconnected, otherwise, a locking instruction is sent to the adjacent edge gateway on one side; judging the section where the fault point is located according to whether the locking instruction is received from the adjacent gateway or not and controlling the locking of the sectionalizers of the sections without the fault point; and controlling the sectionalizer of the section where the fault point is located to close the recloser in a fault-free state and realize the isolation of the fault point.
In some embodiments, the recloser is configured on a feeder line at a first switching site at the outlet end of the substation; the sectionalizer is configured on a feeder line of each switch station; the edge gateways arranged on different switch stations have an upper-level and lower-level relation, and the edge gateway closer to the recloser is the upper level of the edge gateway farther from the recloser; the edge gateway is further configured to: when a fault occurs, if no recloser is arranged at a switching station corresponding to the edge gateway, a locking instruction is sent to the adjacent upper-level edge gateway; when a locking instruction sent by an adjacent lower-level edge gateway is received, locking of the sectionalizer of the corresponding switching station is kept; when a locking instruction sent by an adjacent lower-level edge gateway is not received after a preset time delay, the sectionalizer corresponding to the switching station is disconnected; when one sectionalizer is disconnected, the edge gateway corresponding to the disconnected sectionalizer sends a closing instruction to an adjacent superior edge gateway and sends a tripping instruction to an adjacent inferior edge gateway; when a closing instruction sent by an adjacent lower-level edge gateway is received, if a recloser is arranged at a corresponding switching station, the recloser is closed, otherwise, the closing instruction is continuously forwarded to the upper-level edge gateway; and the edge gateway receiving the tripping instruction controls the corresponding sectionalizer to be disconnected.
In some embodiments, the sectionalizer further comprises an inbound side sectionalizer configured at an inbound side of the switch site feeder and an outbound side sectionalizer configured at an outbound side of the switch site feeder, and normal power flows from the feeder to the switch site through the inbound side sectionalizer and from the switch site to the feeder through the outbound side sectionalizer; the edge gateway is further configured to: when a locking instruction sent by an adjacent lower-level edge gateway is not received after a preset time delay, only disconnecting the segmentation device of the outbound end of the corresponding switch station; when the tripping instruction is received, only the corresponding incoming terminal sectionalizer is controlled to be disconnected; the edge gateway receiving the tripping command sends a switch closing command to an adjacent subordinate edge gateway; and if the switch station corresponding to the edge gateway receiving the switch closing instruction is provided with an interconnection switch, closing the interconnection switch to realize the recovery of power supply in the non-fault section, and otherwise, continuously forwarding the switch closing instruction to the adjacent lower-level edge gateway.
According to the embodiment of the invention, the fault occurring section is judged and the sectionalizers of the non-fault section are reliably locked through a point-to-point communication mode between the edge gateways, and the sectionalizers at two sides of the fault point section are respectively disconnected in stages, so that the fault point isolation can be successfully completed by one-time line superposition, and the problems that all information in centralized power distribution automation needs to be uploaded to a centralized control center and can be positioned after complex fault matrix operation, and all sectionalizers need to be upgraded to circuit breakers, and the cost is high are solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, 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 schematic flowchart of a method for isolating a fault of a feeder line of a power distribution network in point-to-point communication according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a power distribution network feeder fault isolation self-healing system for point-to-point communication, which is applicable to an overhead line mode according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a distribution network feeder fault isolation self-healing system for point-to-point communication, which is applicable to a ring main unit mode and provided by the embodiment of the present invention;
fig. 4 is a timing chart of dividing/dividing of each switching element in a method for isolating a feeder fault of a distribution network for point-to-point communication according to an embodiment of the present invention;
fig. 5 is a schematic flow chart of a point-to-point communication power distribution network feeder fault isolation method and a self-healing system.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a method for isolating a fault of a feeder line of a power distribution network based on point-to-point communication, where the point-to-point communication is characterized in that a command is transmitted through a direct data exchange between adjacent edge gateways without being relayed through a network server, where the edge gateway is disposed at each switching station on the feeder line of the power distribution network, and is configured to control opening or closing of a switching element disposed at the corresponding switching station according to a condition that the command is received from the adjacent edge gateway;
the fault isolation method for the feeder line of the power distribution network comprises the following steps:
s100, when a fault occurs, if a switching station corresponding to the edge gateway is provided with a recloser, the recloser is disconnected, otherwise, a locking instruction is sent to the adjacent edge gateway on one side;
s200, judging the section where the fault point is located according to whether the locking instruction is received from the adjacent gateway or not and controlling the locking of the sectionalizers of the sections without the fault point;
and S300, controlling the sectionalizer of the section where the fault point is located to close the recloser in a fault-free state and realize the isolation of the fault point.
At present, the power distribution network architecture mainly comprises a cable-based town ring main unit mode and an overhead line mode, and the method can be applied to power distribution networks in two modes. The feeder of the power distribution network refers to a power transmission line (an overhead line or a cable line) in the power distribution network, the switching elements include, but are not limited to, reclosers, circuit breakers, sectionalizers, etc., and can be suitably configured according to different architectural modes of the power distribution network, and the switching elements are configured at switching stations on the feeder and used for performing opening or closing according to the control of instructions to realize the opening or closing of the feeder of the section controlled by the switching elements.
In particular, the edge gateway is a gateway having an edge computing function, which can be deployed at the edge of a network (near physical devices such as industrial devices and sensors), and can connect physical and digital worlds through functions such as network connection and protocol conversion, thereby providing lightweight connection management, real-time data analysis and application management functions. Specifically, in this embodiment, the edge gateway may detect an overcurrent fault signal, perform arithmetic and logical judgment, communicate the judgment result (corresponding instruction) with the adjacent edge gateway, and Control the operation (opening or closing) of the switching element through a Terminal controller (Terminal controller TC).
It can be understood that the section where the fault point is located refers to the switch stations on both sides of the feeder line where the fault point occurs and the portion between the switch stations, and the non-fault-point section refers to the portion of the whole distribution network line excluding the fault-point section.
It can be understood that the principle of determining the section where the fault point is located in S200 is that, when a fault occurs, only one of the two edge gateways of the section where the fault point is located can sense an overcurrent fault signal on the feeder line, and therefore, the edge gateway that does not receive the blocking instruction is the edge gateway on the side of the section where the fault point is located.
It can be understood that, in step S300, the sectionalizers on both sides of the section where the fault point is located are respectively controlled in stages, and the respective control may be a staged control, which aims to make the recloser switched on in a fault-free state (a state disconnected from the short-circuit fault), and specifically may be a state where the sectionalizers on one side of the fault (a side close to the recloser) are disconnected, so as to avoid the impact of the recloser switched on in a short-circuit state on the power system and the related devices. Meanwhile, the isolation of the fault point in step S300 is achieved based on controlling the segmenter stage of the section in which the fault point is located. The isolation of the fault point can be the state that the sectionalizers on the two sides are respectively disconnected, and the process only needs to be subjected to the process of one-time disconnection and one-time connection of the recloser, so that the fault point isolation is completed after the recloser is subjected to one-time superposition (disconnection and connection), and the impact of multiple-time superposition on a power grid and the damage to a switch element are avoided.
It can be understood that, with the development and application of wireless communication technology, especially 5G communication technology, the communication between adjacent edge gateways in this embodiment may be based on a virtual private network of 5G network slicing technology or a 5G power wireless private network, so as to simultaneously meet the requirement of edge computing for power distribution network automation, and avoid the problems of using traditional optical fiber communication.
In the embodiment, by means of point-to-point communication between edge gateways, a fault occurring section is judged, sectionalizers in a non-fault section are reliably locked, and sectionalizers on two sides of the fault point section are disconnected in stages respectively, so that fault point isolation can be successfully completed by one-time line superposition, and the problems that all information in centralized power distribution automation needs to be uploaded to a centralized control center and can be positioned after complex fault matrix operation, and all sectionalizers need to be upgraded to circuit breakers, which is high in cost, are solved.
In the distribution network system shown in fig. 2, in some embodiments, the recloser is configured on the feeder of the first switching station at the outlet end of the substation; the sectionalizer is configured on a feeder line of each switch station; the edge gateways arranged on different switch stations have an upper-level and lower-level relation, and the edge gateway closer to the recloser is the upper level of the edge gateway farther from the recloser;
in step S100, sending a blocking instruction to an adjacent edge gateway specifically is sending a blocking instruction to an adjacent upper edge gateway;
step S200 includes the steps of:
s210, when a locking instruction sent by an adjacent lower-level edge gateway is received, locking of a sectionalizer of a corresponding switch station is kept;
and S220, when the locking instruction sent by the adjacent lower-level edge gateway is not received after the preset time delay, the sectionalizer corresponding to the switching station is disconnected.
It should be noted that the purpose of setting the preset time delay in step S220 is to turn off the sectionalizer after the recloser is turned off, so as to ensure that the sectionalizer will not turn off the fault current. .
It can be understood that the upper and lower level relationships between the edge gateways can be defined in a digital numbering mode, after the upper and lower level relationships are defined, the communication strategy can be flexibly adjusted according to the arrangement mode of the corresponding switch element in the specific power distribution network architecture, the operation state of the power distribution network system is changed, only the network topology relationship of the corresponding part needs to be adjusted, and the problems of automatic isolation of fault points and power restoration of the system through the communication between the edge gateways are solved more effectively.
Further, step S300 includes the steps of:
s310, when one sectionalizer is disconnected, the edge gateway corresponding to the disconnected sectionalizer sends a closing instruction to an adjacent superior edge gateway and sends a tripping instruction to an adjacent inferior edge gateway;
s320, when a closing instruction sent by an adjacent lower-level edge gateway is received, if a recloser is arranged at a corresponding switching station, the recloser is closed, otherwise, the closing instruction is continuously forwarded to the upper-level edge gateway;
and S330, the edge gateway receiving the tripping instruction controls the corresponding sectionalizer to be disconnected.
It can be understood that after the step S330 is implemented, the segmenters on both sides of the section where the fault point is located are opened, and the fault point is isolated.
The sectionalizer further comprises an inbound end sectionalizer and an outbound end sectionalizer, wherein the inbound end sectionalizer is configured at the inbound end of the switch site feeder line, the outbound end sectionalizer is configured at the outbound end of the switch site feeder line, and normal power flows from the feeder line to the switch site through the inbound end sectionalizer and from the switch site to the feeder line through the outbound end sectionalizer;
the step S220 specifically includes: and when the locking instruction sent by the adjacent lower-level edge gateway is not received after the preset time delay, only disconnecting the segmentation device of the outbound end of the corresponding switch station.
It can be understood that, for the distribution network ring main unit mode, the sectionalizers disposed at the switching stations are generally divided into an inbound end sectionalizer and an outbound end sectionalizer, and in order to isolate fault points more accurately, the inbound end sectionalizer or the outbound end sectionalizer can be specifically controlled to make the fault point isolation range more accurate, so as to expand the power supply range of the non-fault area.
Further, the step S420 specifically includes: and when the tripping instruction is received, only the corresponding inbound terminal sectionalizer is controlled to be disconnected.
As shown in fig. 5, in some embodiments, after step S300, step S400 is further included:
and S400, the edge gateway controls a connection switch on a feeder line of the power distribution network according to the switch closing instruction so as to realize recovery power supply of the non-fault section.
Further, S400 includes the steps of:
s410, the edge gateway receiving the tripping command sends a switch closing command to an adjacent lower-level edge gateway;
and S420, if the switch station corresponding to the edge gateway receiving the switch closing instruction is provided with an interconnection switch, closing the interconnection switch to realize the recovery of power supply in the non-fault section, and if not, continuously forwarding the switch closing instruction to the adjacent lower-level edge gateway.
As shown in fig. 3, in a specific embodiment, edge gateways (Border Gateway BG) with peer-to-peer communication capability are configured for segmenters in a power distribution network, the segmenters in the same site share one edge Gateway, and the edge Gateway includes a CPU unit (based on a GPGA or ARM architecture), a storage unit, a communication module, and the like, and has functions of data acquisition, calculation, logic judgment, communication, control command output, and the like. The edge gateway can autonomously Control the functions of the sectionalizer or the circuit breaker opening/closing actions and record the states of the switching elements through a terminal controller tc (terminal controller). Each BG/TC unit can realize the communication of adjacent BG/TC units based on a communication public network or an electric wireless private network of a 5G slicing technology, and the BG/TC units process data to realize edge calculation; and the edge gateway and the terminal controller can be physically packaged into a unified BG/TC unit. The BG/TC units in the power distribution network are numbered digitally, and the superior-subordinate relation among the BG/TC units is defined according to the distance from a substation outlet circuit breaker (with a reclosing function and a weighing combiner), namely the BG/TC unit closer to the recloser is the superior stage of the BG/TC unit farther from the recloser. Meanwhile, the sectionalizers controlled by the line BG/TC units are distinguished, and if the normal power direction flows into the switch station through the sectionalizers, the sectionalizers are defined as the inbound end sectionalizers (K21, K31 and K41 are the inbound end sectionalizers in the figure 3); if the normal power direction flows from the switch site to the segmenter, the segmenter is defined as an outbound end segmenter (K1, K22, K32 are outbound end segmenters in fig. 3).
Step a: when the BG/TC unit at the side of the transformer station detects and judges that an overcurrent fault exists, timing is started, and a recloser is controlled to be at t0Momentarily disconnected (as shown in fig. 4);
step b: when a BG/TC unit in a line senses an overcurrent fault signal, timing is started and a blocking signal is sent to a superior BG/TC unit, and the superior BG/TC unit blocks an inbound end sectionalizer and an outbound end sectionalizer controlled by the superior BG/TC unit after receiving the blocking signal, namely, the superior BG/TC unit does not perform breaking operation. Simultaneously inquiring whether a blocking signal is sent by a lower BG/TC unit, and controlling the local outbound terminal sectionalizer to be at t if no blocking signal is sent by the lower BG/TC unit1Disconnection at any moment;
step c: after the sectionalizer in the line is disconnected, a recloser closing signal is sent to a superior BG/TC unit, and after the BG/TC unit on the transformer substation side receives the signal, the recloser is controlled to be at t2Closing is finished all the time to realize power supply of a non-fault section;
step d: after the sectionalizer in the line is disconnected, a tripping signal is sent to a BG/TC unit adjacent to the lower stage, and after the adjacent BG/TC unit receives the tripping signal, the adjacent BG/TC unit controls the sectionalizer at the inbound end controlled by the adjacent BG/TC unit to carry out sectionalization at t3Disconnection at any moment;
step e: in the step d, after the sectionalizer is disconnected, a contact switch request signal is sent to the lower BG/TC unit, the lower BG/TC unit sends the contact switch request signal to the BG/TC unit in charge of controlling the contact switch step by step after receiving the contact switch request signal, and the BG/TC unit in charge of controlling the contact switch (the normally open contact switch in the figure 3) receives the contact switchControlling the tie switch at t after the tie switch request signal4Closing operation is completed all the time, load transfer in a non-fault section is achieved, power supply is recovered by other power sources (the transformer station 2 in the embodiment), and therefore system self-healing is completed.
In this embodiment, a communication public network dedicated logic private network or a power wireless private network adopting a 5G slicing technology realizes communication of fault information between adjacent BG/TC units, which is specifically expressed as: the special public network can be realized based on the 5G communication network slicing technology, or the special private network can be realized by building a 5G electric power private network, and the end-to-end communication reliability and the information safety can be ensured in both modes. Each BG/TC unit can judge whether the local switch element senses the fault current through calculation and logic judgment according to the current acquired locally, and can realize the function of information interaction between adjacent BG/TC units.
The specific process of fig. 3 when a failure occurs at point F is explained with reference to the timing chart shown in fig. 4:
(1) when fault current occurs, BG/TC1 senses overcurrent signal and starts timing to control the recloser at t0The K01 breaking operation is completed at time.
(2) When fault current occurs, the BG/TC2 sends a blocking signal to a superior BG/TC1 after sensing an overcurrent signal, and the BG/TC1 controls the sectionalizer K1 to reliably block after receiving the blocking signal.
(3) When fault current occurs, the BG/TC3 cannot sense an overcurrent signal, the BG/TC2 does not receive a blocking signal sent by a lower BG/TC (BG/TC3), and an outbound-end sectionalizer K22 controlled by the BG/TC2 is controlled to be delayed at t1And finishing the breaking operation at any moment. Meanwhile, the breaking operation is notified to the recloser upstream, so that the recloser performs reclosing action.
(4) The BG/TC2 controls a superior BG/TC unit to send a recloser closing signal after a sectionalizer K22 is switched off, and when a BG/TC unit (BG/TC1) in charge of controlling the recloser receives the signal, the recloser is controlled to be at t2And closing is completed at the moment to realize non-fault section power supply (sections from the transformer substation 1 to the BG/TC2 in the embodiment).
(5) After the BG/TC2 controls the sectionalizer K22 to open, a trip is sent to a next BG/TC unit (BG/TC3)The BG/TC3 receives the signal and controls the controlled inbound segmentation device K31 by time delay at t3And the breaking operation is completed all the time, and the isolation of fault points is realized.
(6) The BG/TC3 sends a tie switch request signal to a lower BG/TC unit (BG/TC4) after controlling the tripping of an entry-side sectionalizer K31; BG/TC4 negatively controlling tie switch K42 at t4And closing operation is finished all the time. The load transfer of the non-faulted section is achieved and power is restored from the other power sources (the section of the tie switch to BG/TC3 in this embodiment). In addition, after the fault point (section) is isolated, the fault point is located through other means, and the fault reason is cleaned.
Note that t in FIG. 44>t3>t2>t1>t0Wherein t is2>t1Is a requirement that the recloser be reclosed in a no fault condition, and in alternative embodiments, t may also occur3Is less than or equal to t2The case (1).
As shown in fig. 2, an embodiment of the present invention further provides a distribution network feeder fault isolation self-healing system based on a point-to-point communication manner, where the point-to-point communication is that transmission of an instruction is performed through direct data exchange between adjacent edge gateways without passing through a network server; the system comprises:
the switching element is configured on a switching station on the substation feeder line and used for opening or closing according to the control of the instruction so as to cut off or conduct the section feeder line controlled by the switching element;
an edge gateway which is arranged at each switching station on the feeder line of the power distribution network and is used for controlling the opening or the closing of the switching elements arranged at the corresponding switching station according to the condition of receiving instructions from the adjacent edge gateway
The switching element comprises a recloser and a sectionalizer; the edge gateway is configured to:
when a fault occurs, if the edge gateway is provided with a recloser corresponding to the switching station, the recloser is disconnected, otherwise, a locking instruction is sent to the adjacent edge gateway on one side;
judging the section where the fault point is located according to whether the locking instruction is received from the adjacent gateway or not and controlling the locking of the sectionalizers of the sections without the fault point;
and controlling the sectionalizer of the section where the fault point is located to close the recloser in a fault-free state and realize the isolation of the fault point.
It should be noted that the edge gateway may include a CPU unit (based on a GPGA or ARM architecture), a storage unit, a communication module, and the like, and has functions of data acquisition, calculation, logic judgment, communication, control command output, and the like. The normally open tie switch of fig. 2 is used to close the switch to restore power to the system when the non-faulty end needs to be restored after the fault is isolated.
Furthermore, the recloser is configured on a feeder line of a first switching station at the outlet end of the transformer substation;
the sectionalizer is configured on a feeder line of each switch station;
the edge gateways arranged on different switch stations have an upper-level and lower-level relation, and the edge gateway closer to the recloser is the upper level of the edge gateway farther from the recloser;
the edge gateway is further configured to:
when a fault occurs, if no recloser is arranged at a switching station corresponding to the edge gateway, a locking instruction is sent to the adjacent upper-level edge gateway;
when a locking instruction sent by an adjacent lower-level edge gateway is received, locking of the sectionalizer of the corresponding switching station is kept;
when a locking instruction sent by an adjacent lower-level edge gateway is not received after a preset time delay, the sectionalizer corresponding to the switching station is disconnected;
when one sectionalizer is disconnected, the edge gateway corresponding to the disconnected sectionalizer sends a closing instruction to an adjacent superior edge gateway and sends a tripping instruction to an adjacent inferior edge gateway;
when a closing instruction sent by an adjacent lower-level edge gateway is received, if a recloser is arranged at a corresponding switching station, the recloser is closed, otherwise, the closing instruction is continuously forwarded to the upper-level edge gateway;
and the edge gateway receiving the tripping instruction controls the corresponding sectionalizer to be disconnected.
Further, as shown in fig. 3, the sectionalizer further includes an inbound-side sectionalizer configured at an inbound end of the switch site feeder, and an outbound-side sectionalizer configured at an outbound end of the switch site feeder, and normal power flows from the feeder to the switch site through the inbound-side sectionalizer and from the switch site to the feeder through the outbound-side sectionalizer; in fig. 3, K21, K31, and K41 are inbound side segmenters, and K1, K22, and K32 are outbound side segmenters.
The edge gateway is further configured to:
when a locking instruction sent by an adjacent lower-level edge gateway is not received after a preset time delay, only disconnecting the segmentation device of the outbound end of the corresponding switch station;
when the tripping instruction is received, only the corresponding incoming terminal sectionalizer is controlled to be disconnected;
after the fault point is isolated, sending a switch closing instruction to an adjacent lower-level edge gateway when the tripping instruction is received;
and if the switch station corresponding to the edge gateway receiving the switch closing instruction is provided with an interconnection switch, closing the interconnection switch to realize the recovery of power supply in the non-fault section, and otherwise, continuously forwarding the switch closing instruction to the adjacent lower-level edge gateway.
The power distribution network feeder fault isolation self-healing system based on the point-to-point communication mode is applicable to a power distribution network ring main unit mode and an overhead line mode. When the edge gateway (and the control unit thereof) senses a fault overcurrent signal, the success of line primary reclosing and the system self-healing of a non-fault area are realized in a point-to-point communication mode, and the impact of the traditional sectionalizer and recloser on a power system in a short-circuit state is avoided. The problems that all information in centralized distribution automation needs to be uploaded to a centralized control center, a fault can be located after complex fault matrix operation, and all sectionalizers need to be upgraded to form circuit breakers, and the cost is high are solved.
In the description of the present invention, 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 merely for convenience in describing the present invention 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 invention. 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 meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
It is to be noted that, in the present invention, 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 foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. 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 invention. Thus, the present invention 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 (7)

1. A distribution network feeder fault isolation method based on point-to-point communication is characterized in that the point-to-point communication consists in that the transmission of instructions is realized by direct data exchange between adjacent edge gateways without the transit of a network server, wherein,
the edge gateway is arranged at each switching station on the feeder line of the power distribution network and used for controlling the opening or closing of the switching elements arranged at the corresponding switching station according to the condition of receiving instructions from the adjacent edge gateway, and the switching elements comprise reclosers and sectionalizers;
the fault isolation method for the feeder line of the power distribution network comprises the following steps:
when a fault occurs, if a switching station corresponding to the edge gateway is provided with a recloser, the recloser is disconnected, otherwise, a locking instruction is sent to the adjacent edge gateway on one side;
judging the section where the fault point is located according to whether the locking instruction is received from the adjacent gateway or not and controlling the locking of the sectionalizers of the sections without the fault point;
controlling the sectionalizer of the section where the fault point is located to close the recloser in a fault-free state and realize the isolation of the fault point;
the recloser is configured on a feeder line of a first switching station at the outlet end of the transformer substation;
the sectionalizer is configured on a feeder line of each switch station;
the edge gateways arranged on different switch stations have an upper-level and lower-level relation, and the edge gateway closer to the recloser is the upper level of the edge gateway farther from the recloser;
the method for sending the blocking instruction to the adjacent edge gateway on one side and judging the section where the fault point is located according to whether the blocking instruction is received from the adjacent gateway comprises the following steps:
sending a locking instruction to an adjacent upper-level edge gateway;
when a locking instruction sent by an adjacent lower-level edge gateway is received, locking of the sectionalizer of the corresponding switching station is kept;
when a locking instruction sent by an adjacent lower-level edge gateway is not received after a preset time delay, the sectionalizer corresponding to the switching station is disconnected;
controlling a sectionalizer of a section where a fault point is located to close a recloser in a fault-free state and realize the isolation of the fault point, and comprising the following steps of:
when one sectionalizer is disconnected, the edge gateway corresponding to the disconnected sectionalizer sends a closing instruction to an adjacent superior edge gateway and sends a tripping instruction to an adjacent inferior edge gateway;
when a closing instruction sent by an adjacent lower-level edge gateway is received, if a recloser is arranged at a corresponding switching station, the recloser is closed, otherwise, the closing instruction is continuously forwarded to the upper-level edge gateway;
and the edge gateway receiving the tripping instruction controls the corresponding sectionalizer to be disconnected.
2. The method of claim 1, wherein the feeder fault isolation method for the distribution network based on point-to-point communication,
the sectionalizer also comprises an inbound end sectionalizer and an outbound end sectionalizer, the inbound end sectionalizer is configured at the inbound end of the switch site feeder line, the outbound end sectionalizer is configured at the outbound end of the switch site feeder line, and normal power flows from the feeder line to the switch site through the inbound end sectionalizer and from the switch site to the feeder line through the outbound end sectionalizer;
the judging the section where the fault point is located according to whether the blocking instruction is received from the adjacent gateway or not comprises the following steps:
when a locking instruction sent by an adjacent lower-level edge gateway is received, locking of the sectionalizer of the corresponding switching station is kept;
and when the locking instruction sent by the adjacent lower-level edge gateway is not received after the preset time delay, only disconnecting the segmentation device of the outbound end of the corresponding switch station.
3. The method of claim 2, wherein the feeder fault isolation method for the distribution network based on point-to-point communication,
the edge gateway receiving the trip instruction controls the corresponding sectionalizer to be disconnected, specifically:
and when the tripping instruction is received, only the corresponding inbound terminal sectionalizer is controlled to be disconnected.
4. The method of claim 3, wherein the fault isolation method for the feeder line of the power distribution network based on point-to-point communication,
after controlling the sectionalizer of the section where the fault point is located to close the recloser in a fault-free state and realize the isolation of the fault point, the method further comprises the following steps:
and the edge gateway controls the interconnection switch on the feeder line of the power distribution network according to the switch closing instruction so as to realize the recovery of power supply in the non-fault section.
5. The method of claim 4, wherein the fault isolation method for the feeder line of the distribution network based on point-to-point communication,
the edge gateway controls a contact switch on a feeder line of the power distribution network according to a switch closing instruction so as to realize recovery power supply of a non-fault section, and the method comprises the following steps:
the edge gateway receiving the tripping command sends a switch closing command to an adjacent subordinate edge gateway;
and if the switch station corresponding to the edge gateway receiving the switch closing instruction is provided with an interconnection switch, closing the interconnection switch to realize the recovery of power supply in the non-fault section, and otherwise, continuously forwarding the switch closing instruction to the adjacent lower-level edge gateway.
6. A distribution network feeder fault isolation self-healing system based on a point-to-point communication mode is characterized in that the point-to-point communication is characterized in that instruction transmission is carried out through direct data exchange between adjacent edge gateways without transit through a network server;
the system comprises:
the switching element is configured on a switching station on the substation feeder line and used for opening or closing according to the control of the instruction so as to cut off or conduct the section feeder line controlled by the switching element;
the edge gateway is arranged at each switching station on the feeder line of the power distribution network and is used for controlling the opening or closing of the switching elements arranged at the corresponding switching stations according to the condition of receiving instructions from the adjacent edge gateway;
the switching element comprises a recloser and a sectionalizer; the edge gateway is configured to:
when a fault occurs, if the edge gateway is provided with a recloser corresponding to the switching station, the recloser is disconnected, otherwise, a locking instruction is sent to the adjacent edge gateway on one side;
judging the section where the fault point is located according to whether the locking instruction is received from the adjacent gateway or not and controlling the locking of the sectionalizers of the sections without the fault point;
controlling a sectionalizer of a section where a fault point is located to close a recloser in a fault-free state and realize the isolation of the fault point;
the recloser is configured on a feeder line at a first switching station at the outlet end of the transformer substation;
the sectionalizer is configured on a feeder line of each switch station;
the edge gateways arranged on different switch stations have an upper-level and lower-level relation, and the edge gateway closer to the recloser is the upper level of the edge gateway farther from the recloser;
the edge gateway is further configured to:
when a fault occurs, if no recloser is arranged at a switching station corresponding to the edge gateway, a locking instruction is sent to the adjacent upper-level edge gateway;
when a locking instruction sent by an adjacent lower-level edge gateway is received, locking of the sectionalizer of the corresponding switching station is kept;
when a locking instruction sent by an adjacent lower-level edge gateway is not received after a preset time delay, the sectionalizer corresponding to the switching station is disconnected;
when one sectionalizer is disconnected, the edge gateway corresponding to the disconnected sectionalizer sends a closing instruction to an adjacent superior edge gateway and sends a tripping instruction to an adjacent inferior edge gateway;
when a closing instruction sent by an adjacent lower-level edge gateway is received, if a recloser is arranged at a corresponding switching station, the recloser is closed, otherwise, the closing instruction is continuously forwarded to the upper-level edge gateway;
and the edge gateway receiving the tripping instruction controls the corresponding sectionalizer to be disconnected.
7. The distribution network feeder fault isolation self-healing system based on the point-to-point communication manner as claimed in claim 6,
the sectionalizer also comprises an inbound end sectionalizer and an outbound end sectionalizer, the inbound end sectionalizer is configured at the inbound end of the switch site feeder line, the outbound end sectionalizer is configured at the outbound end of the switch site feeder line, and normal power flows from the feeder line to the switch site through the inbound end sectionalizer and from the switch site to the feeder line through the outbound end sectionalizer;
the edge gateway is further configured to:
when a locking instruction sent by an adjacent lower-level edge gateway is not received after a preset time delay, only disconnecting the segmentation device of the outbound end of the corresponding switch station;
when the tripping instruction is received, only the corresponding incoming terminal sectionalizer is controlled to be disconnected;
the edge gateway receiving the tripping command sends a switch closing command to an adjacent subordinate edge gateway;
and if the switch station corresponding to the edge gateway receiving the switch closing instruction is provided with an interconnection switch, closing the interconnection switch to realize the recovery of power supply in the non-fault section, and otherwise, continuously forwarding the switch closing instruction to the adjacent lower-level edge gateway.
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