CN111817353B - Power distribution network equipment fault processing method - Google Patents

Power distribution network equipment fault processing method Download PDF

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Publication number
CN111817353B
CN111817353B CN202010797476.8A CN202010797476A CN111817353B CN 111817353 B CN111817353 B CN 111817353B CN 202010797476 A CN202010797476 A CN 202010797476A CN 111817353 B CN111817353 B CN 111817353B
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terminal
fault
load
terminals
power
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CN111817353A (en
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谭世克
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Zhengzhou Xianglong Electric Power Co ltd
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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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/388—Islanding, i.e. disconnection of local power supply from the network
    • 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
    • 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
    • H02J13/00002—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 monitoring
    • 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
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • 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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y02B70/3225—Demand response systems, e.g. load shedding, 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
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
    • 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
    • Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
    • 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
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/222—Demand response systems, e.g. load shedding, 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)

Abstract

The invention discloses a power distribution network equipment fault processing method, which comprises the following steps: and configuring terminal association information, and recovering the power distribution network fault and the terminal load. The method for processing the faults of the power distribution network equipment has high automatic operation level, can realize remote control and real-time detection, automatically completes fault detection and isolation through joint debugging of feeder equipment based on the associated configuration of the equipment, and realizes quick recovery of equipment load through an optimized load recovery strategy.

Description

Power distribution network equipment fault processing method
Technical Field
The invention relates to the field of power distribution networks, in particular to a power distribution network equipment fault processing method.
Background
When a power distribution network has a fault, how the distributed power supply operates directly influences the execution of a fault recovery strategy, and when the fault occurs, after a power grid containing equipment such as a terminal or a local device is separated from a public power grid, the power grid performs island operation.
The existing management mode is relatively disordered and lacks relevance to the management of industrial equipment, so that the power supply guarantee and the load recovery of equipment such as a terminal, a local device and the like are relatively passive when a fault occurs.
Disclosure of Invention
In order to solve the defects and shortcomings in the prior art, the invention provides a power distribution network equipment fault processing method which comprises the following steps.
S1, configuring terminal association information.
(1) Establishing a directed association list for each terminal, wherein the list comprises all adjacent terminals connected with the terminal by feeders, and the list comprises all forward terminals, backward terminals and parallel terminals associated with the terminal, wherein the current direction of the feeder from the forward terminal to the terminal is the same as the current direction of the feeder from the terminal to the next terminal, the current direction of the feeder from the backward terminal to the terminal is opposite to the current direction of the feeder from the terminal to the next terminal, and the parallel terminals and the terminal have the same backward terminals.
(2) And determining the power flow direction of the whole network, and regarding any distributed power supply as an origin point for the network containing multiple power supplies, wherein the power flow direction of the whole network is the power direction for supplying power from the origin point to the whole network.
And S2, recovering the power distribution network fault.
The fault recovery steps of the power distribution network containing the distributed power supply are as follows.
(1) After a fault occurs, if the distributed power supply on the fault feeder line is a non-black start distributed power supply, directly tripping off an outlet breaker of the distributed power supply; and for the black start distributed power supply, a grid-connected circuit breaker is disconnected, and an island operation mode of a circuit breaker interface is adopted to supply power to local users. And when the capacity of the black-start distributed power supply is smaller than the load power of the local user, carrying out load shedding operation. The distributed power sources on the non-faulty feeders can continue to remain in grid-tied operation.
(2) After the fault is located, searching for a power-losing area, receiving an instruction of a local device by a terminal, diagnosing the fault area by combining a corresponding directed association list and the whole network power flow direction, informing the local device after the diagnosis is finished, tripping off all switches around the fault by the local device, simultaneously detecting an operation result, if the tripping is unsuccessful, expanding an isolation range by cooperating with other local devices, realizing the recovery of power supply of a fault upstream area by closing a head end outlet breaker switch, and simultaneously recovering the power supply of a fault downstream by closing a connection switch.
The local device at each switch of the feeder line acquires current data, when the line is short-circuited, the local device judges short-circuit faults, and at the line outlet, the local device forms a public tripping signal to trip off the breaker; all terminals acquire the fault information of the local devices, and the fault positions are judged by combining the information acquired by the terminals of the adjacent switches; the local device disconnects the switches at two ends of the fault according to the judgment result of the terminal, realizes the isolation of the fault area and informs other local devices of the isolation result; after the isolation is successful, the local device closes the head-end switch and the interconnection switch by combining the locking information, and the power supply of the non-fault area is recovered.
(3) If the network has unrecovered area, go to step (4), otherwise go to step (5).
(4) And (4) considering all black start distributed power supplies on the fault feeder line, searching a recovery path for the unrecovered area, if the path is found, entering a multi-user island operation mode, and otherwise, maintaining the current operation state.
(5) And performing synchronous operation on all the non-black start distributed power supplies in the network, and connecting the grid again. At this stage, the optimal switching strategy is continuously searched, if the switching state changes, the switching state is adjusted after the grid connection is finished, otherwise, the current state is kept.
(6) And after the fault is cleared, the operation mode before the fault is recovered.
And S3, recovering the terminal load.
(1) And monitoring the bus frequency, voltage, active power, reactive power and terminal running state of the system in real time, and actively responding to the input switch by the terminal when the frequency or voltage of the system is abnormal to a terminal response action value due to disturbance.
(2) The electric energy meter acquires terminal capacity information participating in active response, calculates a load recovery sensitivity index according to local frequency, voltage, active power and reactive power of each bus provided with a switching device, and uploads the capacity information and the load recovery sensitivity index to a coordination center.
(3) Different local devices acquire local state information quantity of frequency, voltage, active power, reactive power and the like in real time, and the current response load priority is calculated. And when the frequency or voltage value reaches the action value of the device, determining the load amount required to be put into the device under the current working condition according to the response load priorities of different buses. And calculating the optimized load recovery amount by combining the terminal response information and the load recovery sensitivity index, and updating the load recovery strategy.
(4) And transmitting the optimized load recovery strategy to each local device. And the local device receives the instruction, updates the action value of each round, and puts the load after certain time delay.
Further, the power distribution network recovers from the fault, and the method further comprises the following steps.
If the terminal detects that the forward terminal has a forward overcurrent action sign, the terminal judges that the terminal is a non-fault area, if the terminal detects that the forward terminal has a backward overcurrent protection action and does not detect that other terminals have forward overcurrent protection actions, the terminal judges that the terminal is a fault area, informs the local device to execute a switch tripping command to isolate faults, and simultaneously sends a switch joint debugging command to other terminals.
Further, the power distribution network recovers from the fault, and the method further comprises the following steps.
If the terminal detects that the backward terminal has a backward overcurrent action mark, the terminal judges the terminal to be a non-fault area, if the terminal detects that the backward terminal has a forward overcurrent protection action and does not detect that other terminals have backward overcurrent protection actions, the terminal judges the terminal to be a fault area, informs the local device to execute a switch tripping command to isolate faults, and simultaneously sends a switch joint debugging command to other terminals.
The method for processing the faults of the power distribution network equipment has high automatic operation level, can realize remote control and real-time detection, automatically completes fault detection and isolation through joint debugging of feeder equipment based on the associated configuration of the equipment, and realizes quick recovery of equipment load through an optimized load recovery strategy.
Drawings
Fig. 1 is a flowchart of a method for processing a fault of a power distribution network device according to the present invention.
Detailed Description
As shown in fig. 1, a method for processing a fault of a power distribution network device according to the present invention includes.
S1, configuring terminal association information.
(1) Establishing a directed association list for each terminal, wherein the list comprises all adjacent terminals connected with the terminal by feeders, and the list comprises all forward terminals, backward terminals and parallel terminals associated with the terminal, wherein the current direction of the feeder from the forward terminal to the terminal is the same as the current direction of the feeder from the terminal to the next terminal, the current direction of the feeder from the backward terminal to the terminal is opposite to the current direction of the feeder from the terminal to the next terminal, and the parallel terminals and the terminal have the same backward terminals.
(2) And determining the power flow direction of the whole network, and regarding any distributed power supply as an origin point for the network containing multiple power supplies, wherein the power flow direction of the whole network is the power direction for supplying power from the origin point to the whole network.
And S2, recovering the power distribution network fault.
The fault recovery steps of the power distribution network containing the distributed power supply are as follows.
(1) After a fault occurs, if the distributed power supply on the fault feeder line is a non-black starting distributed power supply, in order to ensure the electric energy quality, an outlet breaker of the distributed power supply is directly tripped; and for the black start distributed power supply, a grid-connected circuit breaker is disconnected, and an island operation mode of a circuit breaker interface is adopted to supply power to local users. And when the capacity of the black-start distributed power supply is smaller than the load power of the local user, carrying out load shedding operation. The distributed power sources on the non-faulty feeders can continue to remain in grid-tied operation.
(2) After the fault is located, searching for a power-losing area, receiving an instruction of a local device by a terminal, diagnosing the fault area by combining a corresponding directed association list and the whole network power flow direction, informing the local device after the diagnosis is finished, tripping off all switches around the fault by the local device, simultaneously detecting an operation result, if the tripping is unsuccessful, expanding an isolation range by cooperating with other local devices, realizing the recovery of power supply of a fault upstream area by closing a head end outlet breaker switch, and simultaneously recovering the power supply of a fault downstream by closing a connection switch.
The local device at each switch of the feeder line acquires current data, when the line is short-circuited, the local device judges short-circuit faults, and at the line outlet, the local device forms a public tripping signal to trip off the breaker; all terminals acquire the fault information of the local devices, and the fault positions are judged by combining the information acquired by the terminals of the adjacent switches; the local device disconnects the switches at two ends of the fault according to the judgment result of the terminal, realizes the isolation of the fault area and informs other local devices of the isolation result; after the isolation is successful, the local device closes the head-end switch and the interconnection switch by combining the locking information, and the power supply of the non-fault area is recovered.
(3) If the network has unrecovered area, go to step (4), otherwise go to step (5).
(4) And (4) considering all black start distributed power supplies on the fault feeder line, searching a recovery path for the unrecovered area, if the path is found, entering a multi-user island operation mode, and otherwise, maintaining the current operation state.
(5) And performing synchronous operation on all non-black start distributed power supplies (including an island operation unit and a tripped distributed power supply unit) in the network, and connecting the network again. At this stage, the optimal switching strategy is continuously searched, if the switching state changes, the switching state is adjusted after the grid connection is finished, otherwise, the current state is kept.
(6) And after the fault is cleared, the operation mode before the fault is recovered.
And S3, recovering the terminal load.
(1) And monitoring the bus frequency, voltage, active power, reactive power and terminal running state of the system in real time, and actively responding to the input switch by the terminal when the frequency or voltage of the system is abnormal to a terminal response action value due to disturbance.
(2) The electric energy meter acquires terminal capacity information participating in active response, calculates a load recovery sensitivity index according to local frequency, voltage, active power and reactive power of each bus provided with a switching device, and uploads the capacity information and the load recovery sensitivity index to a coordination center.
(3) Different local devices acquire local state information quantity of frequency, voltage, active power, reactive power and the like in real time, and the current response load priority is calculated. And when the frequency or voltage value reaches the action value of the device, determining the load amount required to be put into the device under the current working condition according to the response load priorities of different buses. And calculating the optimized load recovery amount by combining the terminal response information and the load recovery sensitivity index, and updating the load recovery strategy.
(4) And transmitting the optimized load recovery strategy to each local device. And the local device receives the instruction, updates the action value of each round, and puts the load after certain time delay.
Further, the power distribution network recovers from the fault, and the method further comprises the following steps.
If the terminal detects that the forward terminal has a forward overcurrent action sign, the terminal judges that the terminal is a non-fault area, if the terminal detects that the forward terminal has a backward overcurrent protection action and does not detect that other terminals have forward overcurrent protection actions, the terminal judges that the terminal is a fault area, informs the local device to execute a switch tripping command to isolate faults, and simultaneously sends a switch joint debugging command to other terminals.
Further, the power distribution network recovers from the fault, and the method further comprises the following steps.
If the terminal detects that the backward terminal has a backward overcurrent action mark, the terminal judges the terminal to be a non-fault area, if the terminal detects that the backward terminal has a forward overcurrent protection action and does not detect that other terminals have backward overcurrent protection actions, the terminal judges the terminal to be a fault area, informs the local device to execute a switch tripping command to isolate faults, and simultaneously sends a switch joint debugging command to other terminals.
The terminal can be various electric equipment except local equipment in the power distribution network, such as primary equipment, secondary equipment and the like.
The method for processing the faults of the power distribution network equipment has high automatic operation level, can realize remote control and real-time detection, automatically completes fault detection and isolation through joint debugging of feeder equipment based on the associated configuration of the equipment, and realizes quick recovery of equipment load through an optimized load recovery strategy.
The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the scope of the present invention is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present invention, and such modifications and equivalents should also be considered as falling within the scope of the present invention.

Claims (3)

1. A fault processing method for power distribution network equipment is characterized by comprising the following steps:
s1, configuring terminal association information:
(1) establishing a directed association list for each terminal, wherein the list comprises all adjacent terminals connected with the terminal by feeder lines, including all forward terminals, backward terminals and parallel terminals associated with the terminal, wherein the current direction of the feeder line from the forward terminal to the terminal is the same as the current direction of the feeder line from the terminal to the next terminal, the current direction of the feeder line from the backward terminal to the terminal is opposite to the current direction of the feeder line from the terminal to the next terminal, and the parallel terminals and the terminal have the same backward terminals;
(2) determining the power flow direction of the whole network, and regarding a network containing multiple power supplies, taking any one distributed power supply as an origin, wherein the power flow direction of the whole network is the power direction for supplying power from the origin to the whole network;
s2, power distribution network fault recovery:
the fault recovery method of the power distribution network comprising the distributed power supply comprises the following steps:
(1) after a fault occurs, if the distributed power supply on the fault feeder line is a non-black start distributed power supply, directly tripping off an outlet breaker of the distributed power supply; for a black start distributed power supply, a grid-connected circuit breaker is disconnected, and an island operation mode of a circuit breaker interface is adopted to supply power to local users; when the capacity of the black-start distributed power supply is smaller than the load power of a local user, carrying out load shedding operation; the distributed power supply on the non-fault feeder line can continuously keep grid-connected operation;
(2) after the fault is positioned, searching for a power-losing area, receiving an instruction of a local device by a terminal, diagnosing the fault area by combining a corresponding directed association list and the whole network power flow direction, informing the local device after the diagnosis is finished, tripping off all switches around the fault by the local device, simultaneously detecting an operation result, if the tripping is unsuccessful, expanding an isolation range by cooperating with other local devices, realizing the recovery of power supply of a fault upstream area by closing a head end outlet breaker switch, and simultaneously recovering the power supply of a fault downstream by closing a connection switch;
the local device at each switch of the feeder line acquires current data, when the line is short-circuited, the local device judges short-circuit faults, and at the line outlet, the local device forms a public tripping signal to trip off the breaker; all terminals acquire the fault information of the local devices, and the fault positions are judged by combining the information acquired by the terminals of the adjacent switches; the local device disconnects the switches at two ends of the fault according to the judgment result of the terminal, realizes the isolation of the fault area and informs other local devices of the isolation result; after the isolation is successful, the local device closes the head-end switch and the interconnection switch by combining the locking information, and the power supply of the non-fault area is recovered;
(3) if the network has unrecovered areas, turning to the step (4), otherwise, turning to the step (5);
(4) considering all black start distributed power supplies on a fault feeder line, searching a recovery path for an unrecovered area, if the path is found, entering a multi-user island operation mode, otherwise, maintaining the current operation state;
(5) performing synchronous operation on all non-black start distributed power supplies in the network, and connecting the grid again; at this stage, the optimal switching strategy is continuously searched, if the switching state is changed, the switching state is adjusted after the grid connection is finished, otherwise, the current state is kept;
(6) after the fault is cleared, the operation mode before the fault is recovered;
s3, recovering the terminal load:
(1) monitoring the system bus frequency, voltage, active power, reactive power and terminal running state in real time, and actively responding to the input switch by the terminal when the system frequency or voltage is abnormal to a terminal response action value due to disturbance;
(2) the electric energy meter acquires terminal capacity information participating in active response, calculates a load recovery sensitivity index according to local frequency, voltage, active power and reactive power of each bus provided with a switching device, and uploads the capacity information and the load recovery sensitivity index to a coordination center;
(3) different local devices acquire local state information quantity of frequency, voltage, active power, reactive power and the like in real time, and the current response load priority is calculated; when the frequency or voltage value reaches the action value of the device, determining the load amount to be input under the current working condition according to the response load priorities of different buses; calculating an optimized load recovery amount by combining the terminal response information and the load recovery sensitivity index, and updating a load recovery strategy;
(4) the optimized load recovery strategy is sent to each local device; and the local device receives the instruction, updates the action value of each round, and puts the load after certain time delay.
2. The method of claim 1, wherein the power distribution network fault recovery further comprises:
if the terminal detects that the forward terminal has a forward overcurrent action sign, the terminal judges that the terminal is a non-fault area, if the terminal detects that the forward terminal has a backward overcurrent protection action and does not detect that other terminals have forward overcurrent protection actions, the terminal judges that the terminal is a fault area, informs the local device to execute a switch tripping command to isolate faults, and simultaneously sends a switch joint debugging command to other terminals.
3. The method of claim 1, wherein the power distribution network fault recovery further comprises:
if the terminal detects that the backward terminal has a backward overcurrent action mark, the terminal judges the terminal to be a non-fault area, if the terminal detects that the backward terminal has a forward overcurrent protection action and does not detect that other terminals have backward overcurrent protection actions, the terminal judges the terminal to be a fault area, informs the local device to execute a switch tripping command to isolate faults, and simultaneously sends a switch joint debugging command to other terminals.
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