CN116865428A - Rapid fault self-healing method under active power distribution network regional centralized mode - Google Patents

Rapid fault self-healing method under active power distribution network regional centralized mode Download PDF

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Publication number
CN116865428A
CN116865428A CN202310510024.0A CN202310510024A CN116865428A CN 116865428 A CN116865428 A CN 116865428A CN 202310510024 A CN202310510024 A CN 202310510024A CN 116865428 A CN116865428 A CN 116865428A
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China
Prior art keywords
self
healing
fault
power distribution
switching
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Pending
Application number
CN202310510024.0A
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Chinese (zh)
Inventor
戴长春
吴迪
汪伟
王吉文
李端超
张炜
张骏
俞斌
邵庆祝
于洋
孙辉
汪勋婷
张峰
季坤
朱思杰
赵创业
张玉祥
袁瑜
唐小平
陈雨
桂华
张哲民
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Electric Power Research Institute of State Grid Anhui Electric Power Co Ltd
State Grid Anhui Electric Power Co Ltd
Huaibei Power Supply Co of State Grid Anhui Electric Power Co Ltd
Hefei Power Supply Co of State Grid Anhui Electric Power Co Ltd
Beijing Sifang Engineering Co Ltd
Original Assignee
Electric Power Research Institute of State Grid Anhui Electric Power Co Ltd
State Grid Anhui Electric Power Co Ltd
Huaibei Power Supply Co of State Grid Anhui Electric Power Co Ltd
Hefei Power Supply Co of State Grid Anhui Electric Power Co Ltd
Beijing Sifang Engineering Co Ltd
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Publication date
Application filed by Electric Power Research Institute of State Grid Anhui Electric Power Co Ltd, State Grid Anhui Electric Power Co Ltd, Huaibei Power Supply Co of State Grid Anhui Electric Power Co Ltd, Hefei Power Supply Co of State Grid Anhui Electric Power Co Ltd, Beijing Sifang Engineering Co Ltd filed Critical Electric Power Research Institute of State Grid Anhui Electric Power Co Ltd
Priority to CN202310510024.0A priority Critical patent/CN116865428A/en
Publication of CN116865428A publication Critical patent/CN116865428A/en
Pending legal-status Critical Current

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    • 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
    • H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
    • H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
    • H02J13/0004—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers involved in a protection system
    • 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
    • H02H7/261—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 involving signal transmission between at least two stations
    • H02H7/262—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 involving signal transmission between at least two stations involving transmissions of switching or blocking orders
    • 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
    • H02J13/00016—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 a wired telecommunication network or a data transmission bus
    • H02J13/00017—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 a wired telecommunication network or a data transmission bus using optical fiber
    • 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
    • H02J13/00026—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 involving a local wireless network, e.g. Wi-Fi, ZigBee or Bluetooth
    • 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
    • H02J13/00028—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 involving the use of Internet protocols
    • 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
    • H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
    • H02J13/00034—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving an electric power substation
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
    • H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
    • H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
    • H02J3/144—Demand-response operation of the power transmission or distribution network
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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
    • H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
    • H02J2310/50—The network for supplying or distributing electric power characterised by its spatial reach or by the load for selectively controlling the operation of the loads
    • H02J2310/56—The network for supplying or distributing electric power characterised by its spatial reach or by the load for selectively controlling the operation of the loads characterised by the condition upon which the selective controlling is based
    • H02J2310/58—The condition being electrical
    • H02J2310/60—Limiting power consumption in the network or in one section of the network, e.g. load shedding or peak shaving
    • 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
    • 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)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)

Abstract

The invention discloses a rapid self-healing method and a rapid self-healing system for a concentrated mode fault in an active power distribution network area, which belong to the technical field of power distribution automation of a power system, and the technical scheme of the invention aims at a novel multi-source network under the power system, realizes fault location and isolation by collecting relevant information of a power distribution terminal through an area self-healing control terminal, and selects an optimal mode to perform non-fault area power supply by combining the characteristics, residual capacity, carrying capacity and the like of each power supply point so as to realize self-healing and recovery of a line; according to the technical scheme, under the communication condition of 5G or optical fibers, self-healing power supply within 300ms can be realized, the problems of long self-healing time and poor timeliness of the existing power distribution network fault self-healing method are solved, the degree of automation is high, the human intervention is less, and the method has high popularization value.

Description

Rapid fault self-healing method under active power distribution network regional centralized mode
Technical Field
The invention belongs to the technical field of power distribution automation of power systems, and relates to a rapid self-healing method for faults in an active power distribution network area centralized mode.
Background
The power distribution network is relatively single in power supply mode, single power supply, radial power supply or double-power-supply open-loop power supply is generally adopted, the trend direction is constant, the protection and reclosing functions are simple in configuration, fault location and isolation are easy to achieve, and the self-healing function is relatively weak.
Common self-healing methods include: two control modes of centralized and local voltage type of the master station:
the main station is centralized through the mutual communication between the main station and the distribution terminal, and the main station comprehensively judges a distribution network fault section according to fault information detected by the terminal, protection action information of the transformer substation, tripping and superposition information of a switch and the like, and performs fault isolation and non-fault section power supply recovery. Due to timeliness of data processing, accident isolation is usually completed by transformer substation switch protection or tripping of a head-end distribution terminal, and a master station completes fault section isolation and power supply restoration of a non-fault area in a remote control mode, and self-healing time is usually completed in a few minutes. In addition, when the distribution network is automatically built in many places, the construction of the distribution network main station cannot be supported, the investment cost is high, and the economical efficiency is relatively weak.
The on-site voltage feeder automation realizes fault isolation by detecting the working characteristics of 'non-voltage switching off and incoming call delay switching on' through a switch and matching with secondary (reclosing) of a transformer substation outlet switch (distribution network line head-end switch), and recovers power supply in a non-fault area. The method is simple and easy to use, but needs secondary superposition matching to be completed during fault positioning, and causes certain impact to the power grid. Meanwhile, for a network with double power supplies operating in an open loop, when a fault point occurs at a connecting switch, the fault cannot be accurately judged and blocked for interphase short circuit or three-phase short circuit due to the limitation of voltage type logic judgment, and at the moment, the connecting switch meets permanent faults when single-side voltage loss switching-on is carried out, so that the accident is further expanded. The self-healing process takes tens of seconds or even minutes to complete, and the timeliness is poor.
For an active power distribution network (distributed energy access, power bi-directional flow power distribution network), when a fault occurs, after a switch at a transformer substation cuts off the fault, the distributed energy can be reversely powered, and the on-site voltage type feeder automation is not applicable any more. In the future, new energy is increasingly accessed into a power grid, so that a huge and hybrid network architecture is formed, and huge impact is caused on the traditional distribution network automation.
For a distribution network with traditional double power open-loop operation, the transfer capacity of the load is considered at the beginning of the design of the grid, and when the transfer of the load is realized, the transfer capacity of the load is not needed to be considered, and the power supply can be recovered only by self-healing, however, along with the access of a large amount of distributed energy sources, the residual capacity of the load cannot be regulated, and a proper transfer strategy cannot be formulated.
With the development of 5G communication and the progress of self-healing technology of distribution network, the in-situ implementation of distributed self-healing control technology will be more and more emphasized. The 5G communication has the technical characteristics of high speed, low delay and large connection, and meanwhile, the 5G slice grouping technology (SPN, slicing Packet Network) provides guarantee for safe, reliable and efficient transmission of data.
Disclosure of Invention
The invention aims to design a rapid self-healing method for a concentrated mode fault in an active power distribution network area so as to solve the problems of long self-healing time and poor timeliness of the existing power distribution network fault self-healing method.
The invention solves the technical problems through the following technical scheme:
a fault rapid self-healing method under an active power distribution network regional centralized mode is applied to a fault rapid self-healing system, and the fault rapid self-healing system comprises: the system comprises an area self-healing control terminal, a plurality of power distribution terminals and a plurality of power distribution terminals, wherein the power distribution terminals and the area self-healing control terminal are communicated through a wired or wireless network;
the self-healing method comprises the following steps:
the power distribution terminal collects line analog quantity and switching quantity information, protects and controls switching equipment, achieves fault discrimination of the on-site belt tide direction, and transmits information required by a self-healing function to the regional self-healing control terminal through a peer-to-peer communication mode;
the regional self-healing control terminal performs summarized analysis on the regional terminal fault information, calculates residual capacity of each power point to be supplied according to the circuit network topology structure information and by combining the full load capacity of the power point where the self-healing transfer connection switch is positioned and the real-time load capacity of the fault circuit, selects a power point with large residual load capacity as a transfer power supply, and sends out a self-healing control instruction;
and the power distribution terminal executes the self-healing control instruction sent by the regional self-healing control terminal to realize the power supply of the non-fault region.
Further, the calculation formula of the residual capacity is as follows:
E S ＝E-E x (1)
wherein E is S Is the residual capacity, E is the rated power supply capacity, E x Is the maximum load when the fault line is operating normally.
Further, the conditions for selecting the power source point with a large residual load capacity are as follows: the maximum remaining capacity of each point to be powered is required to be larger than the maximum load of the fault line in normal operation, namely, the following formula is satisfied:
wherein E is Si The remaining capacity of each power point is represented, where i=1, 2, 3 x Indicating the maximum load when the faulty line is operating normally.
Furthermore, communication is realized between the power distribution terminal and the regional self-healing control terminal based on the IEC61850 GOOSE communication protocol.
Further, the regional terminal fault information includes: the method comprises the steps of selecting an optimal interconnection switch according to the switching characteristics of interconnection switches of a line to be supplied, the operation times of the interconnection switches of the line to be supplied and the switching abnormal signals of the interconnection switches, and according to the switching characteristics of different interconnection switches, wherein the switching characteristics of the interconnection switches comprise the switching types, the properties, the topological relations, the fault types, the fault states and the switching position information.
Further, the circuit network topology information includes: the switching address, adjacent switching address, switching type, switching nature.
The invention has the advantages that:
aiming at a novel multi-source network under the power system, the technical scheme of the invention realizes fault location and isolation by collecting related information of a power distribution terminal through a regional self-healing control terminal, selects an optimal mode to perform non-fault regional power supply by combining the characteristics, the residual capacity, the carrying capacity and the like of each power supply point, and realizes self-healing and recovery of a circuit; according to the technical scheme, under the communication condition of 5G or optical fibers, self-healing power supply within 300ms can be realized, the problems of long self-healing time and poor timeliness of the existing power distribution network fault self-healing method are solved, the degree of automation is high, the human intervention is less, and the method has high popularization value.
Drawings
Fig. 1 is a schematic structural diagram of a fault rapid self-healing system in an active power distribution network area centralized mode according to a first embodiment of the present invention;
FIG. 2 is a network topology of a typical power distribution network including three power points, two tie switches, and six sectionalizers according to a first embodiment of the invention;
FIG. 3 is a flowchart of a method for rapid self-healing of active power distribution network regional centralized mode faults according to an embodiment of the present invention;
fig. 4 is a topology of a network topology of a typical power distribution network including three power points, two tie switches, and six segment switches according to a first embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described in the following in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The technical scheme of the invention is further described below with reference to the attached drawings and specific embodiments:
example 1
As shown in fig. 1, an active power distribution network regional centralized mode fault rapid self-healing system includes: 1# to 8# power distribution terminals, and an area self-healing control terminal; the plurality of power distribution terminals communicate with the regional self-healing control terminal through the SPN bearing network; specifically, the local self-healing control terminal and the power distribution terminal realize transverse communication by utilizing a wireless network point-to-point communication function through a GOOSE communication protocol based on IEC61850, so as to establish an information interaction point table corresponding to the power distribution terminal and the local self-healing control terminal; the information interaction point table comprises: the power supply source normally operates the maximum load, the residual capacity of the power supply source to be supplied and the circuit connection switch characteristic to be supplied.
The power distribution terminal is responsible for collecting line analog quantity and switching value information on site, protecting and controlling the switching equipment, realizing fault discrimination in the on-site belt tide direction, and transmitting information required by the self-healing function to the regional self-healing control terminal through a peer-to-peer communication mode; the regional self-healing control terminal is used for carrying out summarized analysis on regional terminal fault information, feeding back processing results to each power distribution terminal, and enabling the power distribution terminals to execute operation so as to realize non-fault regional power supply;
the regional terminal fault information comprises: the method comprises the steps of selecting an optimal interconnection switch according to the switching characteristics of interconnection switches of a line to be supplied, the operation times of the interconnection switches of the line to be supplied and the switching abnormal signals of the interconnection switches, and according to the switching characteristics of different interconnection switches, wherein the switching characteristics of the interconnection switches comprise the switching types, the properties, the topological relations, the fault types, the fault states and the switching position information.
The GOOSE communication protocol based on IEC61850 realizes the transverse wireless communication between the intelligent power distribution terminal and the area protection self-healing control device by utilizing the point-to-point communication function of the wireless network; the regional protection self-healing control device gathers relevant information uploaded by the intelligent power distribution terminal in the 10kV line for comprehensive processing, and realizes the rapid closing of the optimal contact switch through a 5G or optical fiber high-speed communication medium to recover the power supply of the non-fault region. In a network structure of multi-power supply open-loop operation, when a certain line fails, a power distribution terminal senses the failure type locally and combines a given protection strategy to realize accident diagnosis, positioning and isolation of the line, and at the moment, the power distribution terminal transmits failure information (action value, failure type, action time and the like) and switch position information to a regional self-healing control terminal in a standard GOOSE protocol mode to realize comprehensive research and judgment of self-healing logic. According to the known network topology structure (topology information content comprises a switch type, a switch property, a switch address, an adjacent switch address and the like), the full load capacity of a power point where a self-healing transfer connecting switch is located and the real-time load capacity of a fault line are combined, the residual capacity of each power point is calculated, and a power supply with large residual load capacity is selected as a transfer power supply according to the position of the connecting switch, and a self-healing control instruction is sent.
Taking the network topology in fig. 2 as an example, the self-healing recovery process of the three-terminal power supply network is described in detail:
when the line normally operates, the interconnection switches LW1 and LW2 are in a switching-off state, the sectionalizing switches FS1 to FS6 are in a switching-on state, and the whole power supply network is powered by three power points A, B and C.
The distribution terminal is connected with the regional self-healing control terminal through a wired or wireless network, the communication protocol adopts a GOOSE protocol based on IEC61850, and 4G, 5G or optical fiber communication can be selected according to actual conditions.
In the initial stage of grid construction, the type, the number and the maximum load capacity of each power supply point are all known or estimated information. When the network topology is modeled, the information is configured to the regional self-healing control terminal and used as an initial condition for calculating the load transfer residual capacity. And meanwhile, the network topology information is configured to the regional self-healing control terminal. The network topology information includes: the switch address, the adjacent switch address, the switch type (breaker/load switch), the switch property (sectionalizer/tie switch) and the like take the network topology in fig. 2 as an example, the network topology information is shown in fig. 4, and the topology identification of the address information is adopted, so that the switch with two connection points for the switch of the current stage is not difficult to find to be a link switch; only one end is connected with a power supply point; the three connection point switches are single branch switches.
And the power supply point switch equipment calculates the power supply load at regular time when the line normally operates, and transmits the data to the regional self-healing control terminal to carry out maximum load capacity statistics, and the maximum load capacity statistics is taken as another parameter for calculating the residual capacity.
E S ＝E-E x (1)
Wherein E is S Is the residual capacity, E is the rated power supply capacity, E x Is a fault lineMaximum load when the road is operating normally.
The fault self-healing process is analyzed as follows:
when the fault point occurs at K1, i.e., between FS1 and FS2, FS1 has fault current flowing, and FS2 has no fault current, at this time, the FS1 device trips, and when FS2 configures in-situ logic, the voltage is lost to trip (but there is no blocking signal, and when the load is turned on, the single side gets power to automatically close). And the FS1 and the FS2 send fault information to the regional self-healing control terminal, and the regional self-healing control terminal sends a locking signal or simultaneously sends a tripping and locking instruction to the FS2 according to the network topological relation and the distribution network automation control signal, so that the fault isolation process is completed.
According to the network topology structure, two or more contact switches are known, which line is selected to carry out self-healing switching, which power supply is selected to carry out switching by judging which power supply capacity is large according to the calculation process of the residual capacity, and the regional self-healing control terminal sends an automatic switching-on instruction to the corresponding contact switch.
To realize the logic discrimination of load transfer, the transfer power supply load residual capacity must satisfy two conditions, namely: the high-capacity power supply is selected, and the residual capacity is required to be larger than the maximum load when the fault line normally operates, namely the following formula is satisfied:
wherein E is Sb Indicating the remaining capacity of the power supply point B, E Sc Indicating the remaining capacity of the power point C, E xa And the maximum load of the fault line corresponding to the power supply point A in normal operation is represented.
So far, the fault self-healing process at the point F1 is completed.
When a fault point occurs at K2, i.e. between FS2 and LW1, LW 2. Both FS1 and FS2 have fault currents flowing, at which time FS1 and FS2 trip. The FS1 and FS2 send fault information to the regional self-healing control terminal, and the regional self-healing control terminal sends locking and closing information to the LW1 and LW2 two contact switches according to the network topology relation and the distribution network automation control signal.
So far, the fault handling process ends.
As shown in fig. 3, the fault quick self-healing flow is as follows:
(1) Setting the number of power points, connecting switches of all the power points, and the maximum carrying capacity of all the power points;
(2) Setting a historical load statistical time range, and determining a self-healing control strategy;
(3) Judging whether the network connection is normal or not, if so, carrying out the next step, otherwise, ending the flow;
(4) Judging whether the information point table is correct or not, if so, carrying out the next step, otherwise, ending the flow;
(5) Judging whether fault positioning and isolation are successful, if so, carrying out the next step, otherwise, ending the flow;
(6) Calculating the residual capacity of each power point by combining the maximum historical load, and corresponding to N tie switches according to the sequence from large to small;
(7) Determine if switch number N is normal? If yes, outputting a switching-on instruction for switching power supply to the N-number switch, and completing self-healing. Otherwise, judging whether the N-1 switch is normal, and so on.
Test verification
Table 1 below shows the results of centralized self-healing, on-site voltage self-healing and the technical scheme of the invention in terms of self-healing recovery time and self-healing success rate, and through practical functional test verification, the technical scheme of the invention can realize self-healing recovery power supply within 300ms under the communication condition of 5G or optical fibers, has high automation degree, less human intervention and very high popularization value.
TABLE 1 self-healing protocol success comparison
Comparison item Self-healing recovery time Realizing self-healing success rate
Centralized self-healing ＞1min 100％
In-situ voltage type self-healing ＞50s About 70%
The method of the invention < 300ms (fiber or 5G communication) 100％
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (4)

1. The rapid self-healing method for the faults under the centralized mode of the active power distribution network area is applied to a rapid self-healing system for the faults, and is characterized in that the rapid self-healing system for the faults comprises the following steps: the system comprises an area self-healing control terminal, a plurality of power distribution terminals and a plurality of power distribution terminals, wherein the power distribution terminals and the area self-healing control terminal are communicated through a wired or wireless network;
the self-healing method comprises the following steps:
the power distribution terminal collects line analog quantity and switching quantity information, protects and controls switching equipment, achieves fault discrimination of the on-site belt tide direction, and transmits information required by a self-healing function to the regional self-healing control terminal through a peer-to-peer communication mode;
the regional self-healing control terminal performs summarized analysis on the regional terminal fault information, calculates residual capacity of each power point to be supplied according to the circuit network topology structure information and by combining the full load capacity of the power point where the self-healing transfer connection switch is positioned and the real-time load capacity of the fault circuit, selects a power point with large residual load capacity as a transfer power supply, and sends out a self-healing control instruction;
and the power distribution terminal executes the self-healing control instruction sent by the regional self-healing control terminal to realize the power supply of the non-fault region.
The calculation formula of the residual capacity is as follows:
E S ＝E-E x (1)
wherein E is S Is the residual capacity, E is the rated power supply capacity, E x The maximum load is the maximum load when the fault line normally operates;
the conditions for selecting the power supply point with large residual load capacity are as follows: the maximum remaining capacity of each point to be powered is required to be larger than the maximum load of the fault line in normal operation, namely, the following formula is satisfied:
wherein E is Si The remaining capacity of each power point is represented, where i=1, 2, 3 xa Indicating the maximum load when the faulty line is operating normally.
2. The self-healing method according to claim 1, wherein the power distribution terminal and the regional self-healing control terminal communicate with each other based on a GOOSE communication protocol of IEC 61850.
3. The self-healing method according to claim 2, wherein the area terminal failure information includes: the method comprises the steps of selecting an optimal interconnection switch according to the switching characteristics of interconnection switches of a line to be supplied, the operation times of the interconnection switches of the line to be supplied and the switching abnormal signals of the interconnection switches, and according to the switching characteristics of different interconnection switches, wherein the switching characteristics of the interconnection switches comprise the switching types, the properties, the topological relations, the fault types, the fault states and the switching position information.
4. A self-healing method according to claim 3, wherein the circuit network topology information includes: the switching address, adjacent switching address, switching type, switching nature.
CN202310510024.0A 2023-05-08 2023-05-08 Rapid fault self-healing method under active power distribution network regional centralized mode Pending CN116865428A (en)

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