CN111786364B - Distributed-based complex power distribution network fault rapid self-healing control method and system - Google Patents
Distributed-based complex power distribution network fault rapid self-healing control method and system Download PDFInfo
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- CN111786364B CN111786364B CN202010489569.4A CN202010489569A CN111786364B CN 111786364 B CN111786364 B CN 111786364B CN 202010489569 A CN202010489569 A CN 202010489569A CN 111786364 B CN111786364 B CN 111786364B
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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
- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- 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
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
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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
- H02J13/00006—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
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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
- H02J3/12—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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- 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
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- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention discloses a distributed complex power distribution network fault rapid self-healing control method and a distributed complex power distribution network fault rapid self-healing control system in the technical field of intelligent power distribution networks, wherein node information sent by each adjacent node in a power distribution network is received and processed by combining with the node information of the current node, and then the processed node information is transmitted to each adjacent node; determining a fault area according to node information transmitted among nodes; carrying out regional fault isolation on the fault region, and establishing a fault isolation region; restoring power supply to the upstream area of the fault isolation area; and restoring power supply to the downstream area of the fault isolation area. Through information interaction between adjacent equipment, the quick positioning isolation and power supply recovery of power distribution network faults under different types of switch parallel-serial connection, multi-power multi-connection and other complex grid structure of the power distribution network and different operation modes can be realized, and the method has the advantages of small information interaction amount, less communication terminal involvement, short fault self-healing control time and the like.
Description
Technical Field
The invention belongs to the technical field of intelligent power distribution networks, and particularly relates to a distributed complex power distribution network fault rapid self-healing control method and system.
Background
The intelligent power distribution network has the important characteristic that active self-healing control can be carried out after a fault, and power supply recovery of a fault isolation area and a non-fault area is completed. The distributed feeder automation system comprises a power distribution terminal with a distributed feeder automation function and corresponding communication equipment, can automatically realize the functions of fault location, isolation and non-fault area recovery power supply of a feeder through mutual communication between the power distribution terminals without depending on a power distribution main station, and reports a processing process and a result to the power distribution automation main station. Distributed feeder automation is an important implementation means for power distribution network intellectualization, and is an effective way for improving power supply reliability. The existing distributed feeder is automatic, transient faults and permanent faults are not distinguished, the adaptability of a complex power distribution network frame structure formed by series-parallel connection of a circuit breaker and a load switch is poor, and no perfect solution is provided in the aspects of multi-power supply conversion and supply selection, conversion and supply overload pre-judgment, conversion and supply overload processing, non-fault area power supply recovery and the like. Centralized feeder automation and proxy feeder automation have advantages in the aspect of power supply recovery in a non-fault area, but have the defects of large information interaction amount, more communication terminals, long fault self-healing control time and the like.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a distributed-based method and a distributed-based system for rapid self-healing control of faults of a complex power distribution network, and the method and the system have the advantages of small information interaction amount, few communication terminals, short fault self-healing control time and the like.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a distributed complex power distribution network fault rapid self-healing control method comprises the steps of receiving node information sent by each adjacent node in a power distribution network, combining the node information of a current node for processing, and transmitting the processed node information to each adjacent node; determining a fault area according to node information transmitted among nodes; carrying out regional fault isolation on the fault region, and establishing a fault isolation region; restoring power supply to the upstream area of the fault isolation area; and restoring power supply to the downstream area of the fault isolation area.
Further, the node information includes state information of the node, power connection states of both sides of the node, the loadable capability of the power supplies of both sides of the node, the to-be-transferred load in the downstream area of the fault isolation area, and the number of stations experienced on the transmission path.
Further, the performing of area fault isolation on the fault area and establishing the fault isolation area specifically include: putting transient fault detection, and judging whether a fault area is transient fault or permanent fault; and carrying out regional fault isolation on the permanent fault to establish a fault isolation region.
Further, the transient fault detection comprises: if the protection action switch in the fault area is a breaker, tripping is carried out by a first-out port of the breaker, then time delay coincidence is carried out, if the coincidence is successful, the fault is an instantaneous fault, the self-healing of the fault is finished, and power supply is recovered; if the coincidence fails, the fault is a permanent fault; if the protection action switch in the fault area is a load switch, a breaker on a power supply loop of the fault area trips firstly, then time delay coincidence is carried out, if the coincidence is successful, an instantaneous fault is formed, the self-healing of the fault is completed, and power supply is recovered; if the coincidence fails, the fault is a permanent fault.
Furthermore, the circuit breaker on the power supply loop of the fault area trips based on the fact that the node switch in the fault area transmits the fault signal to the power supply direction of the circuit breaker in a step-by-step proxy mode to achieve remote tripping or trip is achieved based on time range coordination.
Further, the power restoration for the upstream area of the fault isolation area specifically includes: if the protection action switch in the fault area is a breaker, the upstream area of the fault isolation area is not powered off and does not need to be recovered; and if the protection action switch in the fault area is a load switch, transmitting a closing signal along the power supply path to the direction of the power supply until the opening circuit breaker receives the closing signal, and closing the opening circuit breaker after receiving the closing signal to complete power supply recovery of the fault upstream area.
Further, the recovering power supply to the downstream area of the fault isolation area specifically includes:
determining a transfer power supply path, namely a transfer power supply, of a downstream area of the fault isolation area, namely determining a transfer power supply of a node which is directly connected with the downstream area in the fault isolation area;
the nodes directly connected with the downstream area from the fault isolation area are marked asThe downstream area fault first switch transmits the capacity P to be cut off to the adjacent node step by step cutt Identifying the selected transfer power supply;
when a node arrives, if the node is connected with the selected switching power supply, capacity cutting judgment and processing are carried out:
P cutr no more than 0, and no site load cutting is carried out;
P cutr if the quantity is more than 0, the non-important load of the site is screened and cut, and the capacity P to be cut transmitted to the next adjacent node is calculated cutt ；
P cutt ＝P cutr –P scut (1)
Wherein, P cutr Indicating the capacity to be cut off received by the station, i.e. the capacity P to be cut off transmitted by the previous neighboring node cutt ，P scut Indicating the cut-out capacity of the site;
continuously transmitting information such as the capacity to be cut off and the identification of the power supply to be switched to the adjacent node; when the power is transmitted to the interconnection switch connected with the selected transfer power supply, the cutting capacity judgment is carried out again:
1)P cutr if the current is less than or equal to 0, switching on the contact switch to complete power supply transfer, and recovering power supply of a downstream area;
2)P cutr > 0 and P cutr ≤P scut If the communication site is switched off, the load is cut off and then the switch is switched on to complete the switching, and the power supply of the downstream area is recovered;
3) Otherwise, the interconnection switch is not allowed to be switched on, and the switching supply fails;
in addition, if load shedding processing is not allowed in the transfer process, the processing is carried out at the first switch of the fault of the direct downstream area, P cutt If the voltage is more than 0, the power supply is not transferred, otherwise, the power supply is transferred to recover the power supply of the downstream non-fault area.
Downstream area fault head switch delivered to-be-cut capacity P cutt The calculation formula is as follows:
P cutt ＝P tra –P cap (2)
wherein, P tra Indicating pending load transfer, i.e. before failure of the switchPower, P cap Indicating the selected rechargeable power source's capacity.
Further, the determining a transfer path of the downstream area of the fault isolation area specifically includes: comprehensively considering the condition of a transfer power supply connected at the downstream, the load-increasing capacity of the transfer power supply, the load to be transferred in the downstream area and the set power supply priority, and selecting a transfer path; and when no specific priority requirement exists, selecting the transfer power supply with the maximum load-increasing capacity for transfer processing.
A distributed-based complex power distribution network fault rapid self-healing control system comprises a plurality of intelligent power distribution terminal devices, wherein each node is provided with one intelligent power distribution terminal device, the intelligent power distribution terminal devices receive node information sent by each adjacent node in a power distribution network in real time and process the node information by combining the node information of the current node, and then transmit the processed node information to each adjacent node; the node information comprises state information of the node, power supply connection states at two sides of the node, the load-carrying capacity of the power supplies at two sides of the node, the load to be transferred in the downstream area of the fault isolation area and the number of stations experienced on a transmission path; the intelligent power distribution terminal equipment is installed in each power distribution station in the power distribution network, and is adjacent to the intelligent power distribution terminal equipment, the information interaction is carried out in a GOOSE peer-to-peer communication mode (other rapid communication technologies can also be adopted, such as wireless 5G communication and other communication regulations) and the method is used for completing the distributed complex power distribution network fault rapid self-healing control method.
Furthermore, the power distribution station comprises a pole top switch, a ring main unit, a power distribution station, an opening and closing station and a box transformer substation.
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the power distribution network fault self-healing control method, rapid positioning isolation and power supply recovery of the faults of the complex power distribution network can be realized through information interaction between adjacent devices, and the method has the advantages of small information interaction amount, few communication terminals, short fault self-healing control time and the like;
(2) According to the power distribution network fault self-healing control system provided by the invention, the automatic identification of the interconnection switch, the automatic sensing of open-loop and closed-loop operation modes can be realized by identifying the power supply connected to the two sides of the switch and distinguishing the type of the connected power supply (power supply and transfer power supply), and the quick self-healing control of power distribution network faults under multiple power supplies and different operation modes can be realized by combining the connection state of the switch power supply, the switch load state, the transfer power supply with the increased load capacity and the like in a fault area, and meanwhile, instantaneous faults and permanent faults can be processed, so that the power distribution network fault self-healing control system is suitable for the complex power distribution network structure with different types of switches in series-parallel connection.
Drawings
Fig. 1 is a schematic control flow diagram of a distributed complex power distribution network fault rapid self-healing control method according to an embodiment of the present invention;
FIG. 2 is a network architecture of a multi-power-supply urban distribution network and a first operation mode thereof;
FIG. 3 is a second network architecture of a multi-power urban distribution network and a second operation mode thereof;
FIG. 4 is a third network architecture of a multi-power-supply urban distribution network and an operation mode thereof;
fig. 5 is a multi-power-supply urban distribution network architecture and a fourth operation mode thereof.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The first embodiment is as follows:
as shown in fig. 1 to 5, a distributed-based method for controlling rapid self-healing of a fault of a complex power distribution network includes: receiving node information sent by each adjacent node in the power distribution network, processing the node information by combining the node information of the current node, and transmitting the processed node information to each adjacent node; determining a fault area according to node information transmitted among nodes; inputting transient fault detection, and judging whether a fault area is a transient fault or a permanent fault; carrying out regional fault isolation on the permanent fault and establishing a fault isolation region; restoring power supply to the upstream area of the fault isolation area; and restoring power supply to the downstream area of the fault isolation area.
Each power distribution station (pole switch, ring main unit, power distribution station, switching station, box transformer substation and the like) in the power distribution network is configured with intelligent power distribution terminal equipment, each switch is a node, the intelligent power distribution terminal equipment receives node information sent by each adjacent node in the power distribution network in real time, processes the node information by combining the node information of the current node, and then transmits the processed node information to each adjacent node; the node information comprises state information of the node, power supply connection states at two sides of the node, the load-carrying capacity of the power supplies at two sides of the node, the load to be transferred in the downstream area of the fault isolation area and the number of stations passing through the transmission path. The intelligent power distribution terminal equipment realizes the power distribution network fault self-healing control method, and the control logic of the method is shown in figure 1; the adjacent terminals perform information interaction, and a GOOSE peer-to-peer communication mode can be adopted, and other rapid communication technologies, such as wireless 5G communication and other communication conventions, can also be adopted.
The proxy transmission mechanism based on the adjacent node is that the node information is transmitted to the adjacent node, the adjacent node combines the self information (such as the switch position state) to carry out comprehensive processing on the received information, and then the processed information is transmitted to the adjacent node. The terminal equipment adopts the method to carry out information interaction and sharing, and the nodes in the network only need to communicate with the adjacent nodes, thereby reducing the network load and the communication complexity. Taking S2-K1 switch in fig. 2 as an example, the S2-K1 switch exchanges information with K2-K6 switches in the S2 station, and exchanges information with adjacent S1-K2 switches.
The switch senses the connection state of the power supplies at two sides: and transmitting the power connection state to the adjacent node from the power point, processing the received information by the adjacent node by combining the information such as the current switch position state of the adjacent node, and transmitting the processed information to the adjacent node. In the transmission process, the number of stations passing through the transmission path can be counted, and the initial estimation of the distance is carried out by utilizing the number of stations. For any node in the network: if the power supply only passes through one position-dividing switch to reach the node switch, defining the power supply as a connection power supply of the node switch; if the power source does not pass through the split switch (i.e. all the switches on the transmission path are on), the power source is defined as the power source of the node switch. Therefore, any node switch in the network can dynamically sense the power supply connection condition on two sides of the node switch.
The switch senses that two sides are connected with the power supply and has the load-increasing capacity: the power supply point calculates the current load-carrying capacity in real time (the current load-carrying capacity = allowable load capacity-current actual load; current or power can be adopted), and the current load-carrying capacity is transmitted to the adjacent nodes step by step from the power supply point similarly to the transmission of the power supply connection state. For any node in the network: if the power supply load-carrying capacity only passes through one position-dividing switch, the corresponding power supply is the connection power supply of the node switch, and the load-carrying capacity of the connection power supply connected with the node switch is also obtained; if the through switches are all closed, the power supply supplies power to the node switch; and if the two or more than 2 split switches are crossed, clearing. Therefore, any node switch in the network can dynamically acquire the load-increasing capacity of the power supplies connected to the two sides of the node switch and the type of the power supplies connected to the two sides (the power supply or is not connected with the power supply or).
Automatic identification of interconnection switch:
in the mode 1, the switch is positioned, and two sides of the switch are provided with pressure; by adopting the mode, PT (potential transformer) are required to be arranged on two sides of the section switch on the main line;
in the mode 2, the power supply connection condition is transmitted to the adjacent node step by step, and the switch dynamically senses the power supply connection condition on the two sides of the adjacent node; the switch is separated, and the two sides of the switch are connected with a power supply.
Automatic identification of closed-loop operation: and the switch is switched on, and both sides of the switch are connected with a power supply, so that the switch is in a closed-loop operation network.
Fault positioning: defining a region, namely defining a range enclosed by two adjacent switches as boundaries; the branch line ends are also considered as regions. The distribution network is divided according to area definitions, protection actions (including interphase short-circuit faults, grounding faults and the like) of certain nodes in an area are judged through node information (acquired by transmission of adjacent nodes) shared in the area, if the node information is a traversing fault, the area is a non-fault area, and if the node information is not the traversing fault, the area is a fault area.
Fault isolation: when a protection action switch (a switch with a power supply source connected to the inner side and the outer side of the area) in a fault area is a breaker, the breaker is tripped by a first-out port of the breaker, and then time delay coincidence is carried out: if the coincidence is successful, the fault is an instantaneous fault, and the self-healing of the fault is finished; if the coincidence fails, the fault is a permanent fault, the regional fault isolation is started, and a fault isolation region is established.
When the protection action switch in the fault area is a load switch, a breaker on a fault power supply loop trips firstly, and then is delayed and coincided by the breaker: if the coincidence is successful, the fault is an instantaneous fault, and the self-healing of the fault is completed; if the coincidence fails, the fault is a permanent fault, the regional fault isolation is started, and a fault isolation region is established. The tripping of the circuit breaker on the fault power supply loop can realize remote tripping by transmitting fault signals to the power supply direction of the circuit breaker step by step on the basis of a node switch in a fault area, and can also be realized on the basis of time range difference coordination.
For a closed-loop operation or a distributed power access network, a positive trend direction is globally assumed, as shown in fig. 5, a positive current breaker in a fault area is tripped and coincided (when a switch in the fault area is a load switch, the breaker on a positive power supply path is tripped and coincided), then transient fault processing is performed, and a synchronization detection operation or a no-voltage detection operation is performed during switching-on.
And judging whether the coincidence fails or not by the nodes in the fault area through fault counting or voltage loss counting, thereby determining whether the nodes are permanent faults or not. ( For an open-loop operating network, a voltage loss count or a fault count may be employed; fault counting may be employed for closed loop operation, distributed power access networks; if the count is 2 within the set time, the failure is permanent )
Transient faults can be treated as permanent faults, after a fault area is determined, area fault isolation is directly started, a fault isolation area is built, and then power supply of non-fault areas (an upstream area of the fault isolation area and a downstream area of the fault isolation area) is restored.
If the switch refuses to operate, the fault isolation fails, the signal is transmitted to the adjacent switch to carry out expanded fault isolation area processing, the adjacent switch carries out brake-separating operation after receiving the signal, and if the switch refuses to operate, the signal can be selected to be transmitted to the adjacent switch continuously to carry out expanded fault isolation area processing again.
Classifying a non-fault area: (in this embodiment, the failure of the switch failure in fault isolation is not considered, that is, the fault isolation area is equivalent to the fault area), the area outside the switch in the fault isolation area and communicated with the power supply is called the upstream area of the fault isolation area of the switch, that is, the upstream area of the fault; the region outside the switch within the fault isolation zone that is not in communication with the power supply is referred to as the fault isolation zone downstream region of the switch, i.e., the fault downstream region. In the open-loop operation network of fig. 2, a point f1 has a fault, an upstream area of a fault of the S1-K2 switch is a communication area between the S1-K2 and the power supply 1, and a downstream area of a fault of the S2-K1 switch is a communication area between the S2-K1 and the S4-K1, and between the S8-K2. f3 point fault, wherein the upstream area of the S2-K3 switch fault is a communication area from the S2-K3 to the power supply 1; in the open-loop operation network of fig. 3, when a point f1 fails, the downstream area of the S1-K2 switch failure is a communication area between S1-K2 and S1-K1, and the upstream area of the S2-K1 switch failure is a communication area between S2-K1 and a power supply 3; in the open-loop operation network of fig. 4, a point f1 has a fault, an upstream area of a switch fault of S3-K1 is a communication area between S3-K1 and a power supply 1, a downstream area of a switch fault of S3-K2 is a communication area between S3-K2 and S4-K2, and a downstream area of a switch fault of S3-K5 is a communication area between S3-K5 and S7-K2; in the closed-loop operation network of fig. 5, a point f1 fails, the upstream area of the S1-K2 switch failure is a communication area between S1-K2 and the power supply 1, and the upstream area of the S2-K1 switch failure is a communication area between S2-K1 and the power supply 2 and the power supply 3.
And (3) restoring power supply to the upstream area of the fault isolation area: if the protection action switch in the fault area is a breaker, the upstream area of the fault isolation area is not powered off and does not need to be recovered; if the protection action switch in the fault area is a load switch, the upstream area loses power due to the fact that a breaker on a power supply loop is opened, at the moment, a closing signal is transmitted along the power supply loop to the direction of a power supply source until the opening breaker, and the opening breaker closes after receiving the closing signal (in the same period of detection), and power supply recovery of the fault upstream area is completed. For the fault at the f3 point in fig. 2, the S2-K3 switch is connected with the power supply (power supply 1) and the secondary power supply (power supplies 2 and 3) at the same time, and if the S2-K3 switch is a load switch, after the fault is isolated, a closing signal is transmitted to the power supply (power supply 1) direction to perform closing operation of an upstream circuit breaker, so that power supply recovery in a non-fault area is completed.
And (3) restoring power supply to the downstream area of the fault isolation area:
determining a transfer power path (namely a transfer power supply) of a downstream area of the fault isolation area, namely determining the transfer power supply of a node which is directly connected with the downstream area in the fault isolation area;
from a node (marked as a first fault switch of the downstream area) which is directly connected with the downstream area in the fault isolation area, gradually transmitting the capacity P to be cut off to an adjacent node cutt Identifying the selected transfer power supply;
when a node arrives, if the node is connected with the selected switching power supply, capacity cutting judgment and processing are carried out:
P cutr no more than 0, and no site load cutting is carried out;
P cutr if the quantity is more than 0, the non-important load of the site is screened and cut, and the capacity P to be cut transmitted to the next adjacent node is calculated cutt 。
P cutt ＝P cutr –P scut (1)
Wherein, P cutr Indicating the capacity to be cut received by the station (i.e. the capacity to be cut P transmitted by the previous neighboring node) cutt )，P scut Indicating the cut-out capacity of the site;
and continuously transmitting the information such as the capacity to be cut off, the identification of the transfer power supply and the like to the adjacent node. When the power is transmitted to the interconnection switch connected with the selected transfer power supply, the cutting capacity judgment is carried out again:
1)P cutr if the current is less than or equal to 0, switching on the contact switch to complete power supply transfer, and recovering power supply of a downstream area;
2)P cutr > 0 and P cutr ≤P scut (the capacity of the contact site can be cut off), the contact site firstly cuts the load and then closes the switch to complete the power supply transfer, and the power supply of the downstream area is recovered;
3) Otherwise, the interconnection switch is not allowed to be switched on, and the switching fails.
In addition, if the load shedding processing is not allowed to be carried out in the transfer process, the load shedding processing is directly carried out at the failure first switch of the downstream area, P cutt If the voltage is more than 0, the power supply is not transferred, otherwise, the power supply is transferred to recover the power supply of the downstream non-fault area.
The calculation formula of the capacity to be cut Pcut transmitted by the downstream area fault first switch is as follows:
P cutt ＝P tra –P cap (2)
wherein, P tra Indicating the load to be transferred (i.e. the power before failure of the switch), P cap Indicating the selected rechargeable power source's capacity.
Under the operation mode of fig. 2, if the point f1 fails, the area can be determined to be a failure area through information interaction between S1-K2 and S2-K1:
(1) And S1-K2 are circuit breakers, and the direct outlet trips to remove faults. If the transient fault detection is put into operation, the S1-K2 is superposed after being disconnected, and the transient fault is successfully superposed, and the self-healing of the fault is finished; permanent fault, failure of coincidence, fault area isolation, and no power loss in the upstream area after tripping in failure of coincidence of S1-K2; due to the permanent fault of the area, after the S2-K1 is tripped off, the downstream area loses power and starts the fault self-healing control;
(2) S1-K2 are load switches, and fault current cannot be cut off (small current grounding fault can be configured as an action outlet, the processing flow is similar to that of a breaker at the moment, namely the load switches are regarded as breakers, and when the fault current is smaller than the cutting capacity of the load switches, the breakers can be separated, and the upstream breakers (such as P1) are waited to trip. If the instantaneous fault detection is carried out, the upstream circuit breaker is superposed, and the instantaneous fault is detected, the superposition is successful, and the self-healing of the fault is finished. Permanent fault, the upper circuit breaker fails to be coincided, the isolation of a fault area is started, and after S1-K2 is tripped, the upper circuit breaker is disconnected, and the upper area loses power; after S2-K1 is tripped, the downstream area loses power; at the moment, the non-fault area needs to be restored for power supply;
(3) Self-healing control of upstream non-fault areas of S1-K2: isolating a fault area, and after S1-K2 switching-off is successful, transmitting signals to a power supply point direction step by step until an upstream position-separating circuit breaker receives the signals, switching on the upstream circuit breaker after receiving the signals, and recovering power supply of the upstream area;
(4) And (3) self-healing control of a downstream non-fault area of the S2-K1: S2-K1 according to its pre-fault load (i.e. the load P to be transferred) Tra ) Downstream transfer power supply connection condition, transfer power supplyJudging the power supply capacity, the power supply priority and the like, and determining a supply transfer path; the method comprises two power supply conversion sources (a power supply 2 and a power supply 3), wherein the power supply 2 can be selected as the power supply 2 under the assumption that the current load-increasing capacity of the power supply 2 is the maximum, and the removal capacity is calculated; transmitting the load along the downstream area, and carrying out load shedding judgment on each station in the middle experience stations S2 and S3 to judge whether the station load needs to be shed or not; when the connection switch of S8-K2 is reached, judging the cut capacity again, determining whether the load of the connection station needs to be cut off or not, and whether the switching-on can be carried out or not, if the switching-on condition is met, completing the switching-on, otherwise, prohibiting the switching-on, and failing to carry out the switching-on;
(5) When a plurality of transfer power supplies exist in the downstream fault area, the power supply with the maximum transfer power can be selected for transfer; and simultaneously, the load-increasing capacity of a plurality of transfer power sources is larger than the load to be transferred, and the transfer can be carried out according to the priority of the appointed power source.
In the operation mode of fig. 3, if the point f1 fails, the processing is similar to the operation mode of fig. 2, except that the direction of the power supply path of the failure tide changes, i.e., the S2-K1 power supply is the power supply 3, and the failure isolating switch is switched off and then is transmitted to the power supply 3; the S1-K2 transfer power supply is a power supply 1, and after the fault isolating switch is switched off, the S1-K2 transfer power supply is transferred to the transfer power supply 1.
In the operation mode of fig. 4, if the point f1 fails, the process is similar to the operation mode of fig. 2, the failure region is isolated, the downstream region after the S3-K5 switch is opened and the downstream region after the S3-K2 switch is opened are both supplied, the S3-K2 supply power source is the power source 3, and the S3-K5 supply power source is the power source 2.
In the closed-loop operation of fig. 5, if point f1 fails, the process is similar to the operation of fig. 2, with the main difference being that transient failures are handled. When transient fault is processed, the tripping coincidence of the forward current breaker in the fault area (when the switch in the fault area is a load switch, the tripping coincidence of the breakers on the forward power supply path) is carried out, then transient fault processing is carried out, and synchronous detection or voltage-free detection operation is carried out when the instantaneous fault processing is coincided. If the switches connected with the power supply in the fault area are all circuit breakers, the power of the non-fault area cannot be lost after the fault is isolated; if the load switch is used, after the switch is switched off to isolate the fault, the load switch transmits a signal to the power supply direction of the fault power supply, and the split circuit breaker on the fault power supply path receives the signal to perform switching-on operation, so that power supply recovery is completed.
According to the power distribution network fault self-healing control method provided by the embodiment, the rapid positioning isolation and power supply recovery of the complex power distribution network fault can be realized only through information interaction between adjacent devices. The automatic identification of the interconnection switch and the automatic sensing of open-loop and closed-loop operation modes can be realized by connecting power supply identification on two sides of the switch and distinguishing the types of the connected power supplies (power supply and transfer power supply), and the quick self-healing control of the power distribution network faults under multiple power supplies and different operation modes can be realized by combining the connection condition of the switch power supply, the switch load condition, the transfer power supply capacity increasing capacity and the like in a fault area. Meanwhile, transient faults and permanent faults can be processed, and the method is suitable for complex grid structure of the power distribution network with different types of switches in series-parallel connection.
Utilizing GOOSE peer-to-peer communication mode to carry out information interaction (communication delay is less than or equal to 20 ms) between adjacent devices, if the open loop operation of the power distribution network and uniformly regarding the faults as permanent fault processing, assuming that the number of stations from a switch to a power supply point (a power supply or a transfer power supply) in a fault area is less than or equal to 10, the switch opening time is 40ms, and the switch closing time is 60ms, then: 1) When the switch in the fault area is a breaker, the fault self-healing can be realized within 400ms (fault isolation time: fault detection 20ms + information interaction 20ms + relay outlet 20ms + switch opening 40ms =100ms; and (3) completing fault isolation to the power supply recovery time of a downstream fault area: information transmission 10 x 20ms + relay outlet 20ms + switch closing 60ms =280ms; total fault self-healing time: 100ms +280ms =380ms ≦ 400 ms); 2) When the switch in the fault area is a load switch, compared with the mode of 1) the breaker, the time for waiting for the opening of the upstream breaker is increased only during fault isolation, and the time for recovering the power supply of the upstream and downstream non-fault areas is similar to the mode of 1), and if the upstream breaker removes the fault within 100ms, the whole fault self-recovery process can be controlled within 500 ms.
Example two:
the embodiment provides a distributed complex power distribution network fault rapid self-healing control system, which comprises a plurality of intelligent power distribution terminal devices, wherein the intelligent power distribution terminal devices receive node information sent by each adjacent node in a power distribution network in real time, process the node information by combining the node information of the current node, and transmit the processed node information to each adjacent node; the node information comprises state information of the node, power connection states of two sides of the node, the load-carrying capacity of the power supplies of two sides of the node, the load to be transferred in the downstream area of the fault isolation area and the number of stations experienced on a transmission path; the intelligent power distribution terminal equipment is installed at each power distribution station (including a column switch, a ring main unit, a power distribution station, a switching station, a box transformer substation and the like) in the power distribution network, and adjacent intelligent power distribution terminal equipment adopts a GOOSE peer-to-peer communication mode for information interaction, and can also adopt other rapid communication technologies, such as wireless 5G communication and other communication regulations, and the method is used for completing the distributed complex power distribution network fault rapid self-healing control method based on the first embodiment.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, it is possible to make various improvements and modifications without departing from the technical principle of the present invention, and those improvements and modifications should be considered as the protection scope of the present invention.
Claims (9)
1. A distributed-based rapid self-healing control method for faults of a complex power distribution network is characterized in that,
receiving node information sent by each adjacent node in the power distribution network, processing the node information by combining the node information of the current node, and transmitting the processed node information to each adjacent node;
determining a fault area according to node information transmitted among nodes;
carrying out regional fault isolation on the fault region, and establishing a fault isolation region;
restoring power supply to the upstream area of the fault isolation area;
restoring power supply to the downstream area of the fault isolation area;
the power restoration for the downstream area of the fault isolation area specifically comprises the following steps:
determining a transfer power supply path, namely a transfer power supply, of a downstream area of the fault isolation area, namely determining a transfer power supply of a node which is directly connected with the downstream area in the fault isolation area;
from the node directly connected with the downstream area in the fault isolation area, marked as the first switch of the fault in the downstream area, the capacity P to be cut off is transferred to the adjacent node step by step cutt Identifying the selected secondary power source;
when a node arrives, if the node is connected with the selected switching power supply, capacity cutting judgment and processing are carried out:
P cutr no more than 0, and no site load cutting is carried out;
P cutr if the quantity is more than 0, the non-important load of the site is screened and cut, and the capacity P to be cut transmitted to the next adjacent node is calculated cutt ；
P cutt = P cutr – P scut （1）
Wherein, P cutr Indicating the capacity to be cut off received by the station, i.e. the capacity P to be cut off transmitted by the previous neighboring node cutt ，P scut Indicating the cut-out capacity of the site;
continuously transmitting the capacity to be cut off and the identification of the transfer power supply to the adjacent node; when the power is transmitted to the interconnection switch connected with the selected transfer power supply, the cutting capacity judgment is carried out again:
1）P cutr if the current is less than or equal to 0, the switch-on interconnection switch completes the power supply transfer and recovers the power supply of the downstream area;
2）P cutr > 0 and P cutr ≤P scut If the communication site is switched off, the load is cut off and then the switch is switched on to complete the switching, and the power supply of the downstream area is recovered;
3) Otherwise, the interconnection switch is not allowed to be switched on, and the switching supply fails;
in addition, if the load shedding processing is not allowed to be carried out in the transfer process, the load shedding processing is directly carried out at the failure first switch of the downstream area, P cutt If the power supply is more than 0, the power supply is not transferred, otherwise, the power supply is transferred and recovered in a downstream non-fault area;
downstream area fault head switch delivered to-be-cut capacity P cutt The calculation formula is as follows:
P cutt = P tra – P cap （2）
wherein, P tra Indicating the load to be transferred, i.e. the power before failure, P cap Indicating the selected rechargeable power source's capacity.
2. The distributed-based rapid self-healing control method for the faults of the complex power distribution network according to claim 1, wherein the node information comprises state information of nodes, power connection states of two sides of the nodes, the load-carrying capacity of the power supplies of two sides of the nodes, the load to be transferred in a downstream area of a fault isolation area and the number of stations passing through a transmission path.
3. The distributed-based rapid self-healing control method for the fault of the complex power distribution network according to claim 1, wherein the performing regional fault isolation on the fault area and establishing the fault isolation area specifically comprises:
putting transient fault detection, and judging whether a fault area is transient fault or permanent fault;
and carrying out regional fault isolation on the permanent fault to establish a fault isolation region.
4. The distributed-based rapid self-healing control method for the fault of the complex power distribution network according to claim 3, wherein the transient fault detection comprises:
for an open-loop operating network:
if the protection action switch in the fault area is a breaker, tripping is carried out by a first-out port of the breaker, then time delay coincidence is carried out, if the coincidence is successful, the fault is an instantaneous fault, the self-healing of the fault is finished, and power supply is recovered; if the coincidence fails, the fault is a permanent fault;
if the protection action switch in the fault area is a load switch, a breaker on a power supply loop of the fault area trips firstly, then time delay coincidence is carried out, if the coincidence is successful, an instantaneous fault is formed, the self-healing of the fault is completed, and power supply is recovered; if the coincidence fails, the fault is a permanent fault;
for closed loop operation or distributed power access networks:
and globally assuming a positive trend direction, simultaneously enabling the connection of a voltage transformer and a current transformer to be in the same direction as the assumed direction, judging and detecting the tripping coincidence of the forward current circuit breaker in the fault area, if the circuit breaker is a load switch, processing the tripping coincidence of the circuit breaker on the forward power supply path in the fault area, and detecting the synchronous state and detecting no voltage switching-on during the coincidence.
5. The distributed-based rapid self-healing control method for the faults of the complex power distribution network according to claim 4, wherein the circuit breaker on the power supply loop of the fault area trips based on the step-by-step proxy transmission of fault signals to the power supply direction of the node switch in the fault area to realize remote tripping or based on the time range coordination to realize tripping.
6. The distributed-based rapid self-healing control method for the fault of the complex power distribution network according to claim 1, wherein the restoring of power supply to the upstream area of the fault isolation area specifically comprises:
if the protection action switch in the fault area is a breaker, the upstream area of the fault isolation area does not lose power and does not need to be recovered; and if the protection action switch in the fault area is a load switch, transmitting a closing signal along the power supply path to the direction of the power supply until the opening circuit breaker receives the closing signal, and closing the opening circuit breaker after receiving the closing signal to complete power supply recovery of the fault upstream area.
7. The distributed-based rapid self-healing control method for the fault of the complex power distribution network according to claim 1, wherein the determining of the transfer path of the downstream area of the fault isolation area specifically comprises: comprehensively considering the condition of a transfer power supply connected at the downstream, the load-increasing capacity of the transfer power supply, the load to be transferred in the downstream area and the set power supply priority, and selecting a transfer path; and when no specific priority requirement exists, selecting the transfer power supply with the maximum load-increasing capacity for transfer processing.
8. A distributed complex power distribution network fault rapid self-healing control system is characterized by comprising a plurality of intelligent power distribution terminal devices, wherein the intelligent power distribution terminal devices receive node information sent by each adjacent node in a power distribution network in real time, process the node information by combining the node information of the current node, and transmit the processed node information to each adjacent node; the node information comprises state information of the node, power supply connection states at two sides of the node, the load-carrying capacity of the power supplies at two sides of the node, the load to be transferred in the downstream area of the fault isolation area and the number of stations experienced on a transmission path; the intelligent power distribution terminal equipment is installed at each power distribution station in a power distribution network, and adjacent intelligent power distribution terminal equipment performs information interaction in a GOOSE peer-to-peer communication mode and is used for completing the distributed complex power distribution network fault rapid self-healing control method based on any one of claims 1 to 7.
9. The distributed-based rapid self-healing control system for faults of a complex power distribution network according to claim 8, wherein the power distribution stations comprise column switches, ring main units, power distribution stations, switching stations and box transformers.
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| CN112290518A (en) * | 2020-10-23 | 2021-01-29 | 珠海许继电气有限公司 | Intelligent distributed feeder protection method and system based on 5G communication |
| CN112258071B (en) * | 2020-10-29 | 2023-08-29 | 广东电网有限责任公司广州供电局 | Method, device and related equipment for dynamic rush-repair of distribution network after disaster |
| CN112736875B (en) * | 2020-12-28 | 2022-09-30 | 广东电网有限责任公司 | Hybrid self-healing method for input and commissioning equipment of power distribution network |
| CN112865320B (en) * | 2021-02-25 | 2023-03-24 | 南京国电南自电网自动化有限公司 | Power grid self-healing control method and device based on power loss path information flow transition and flexible level difference |
| CN113295960B (en) * | 2021-04-16 | 2022-06-24 | 国网宁夏电力有限公司电力科学研究院 | CPS multi-dimensional information-oriented power distribution network fault identification method |
| CN114143124A (en) * | 2021-11-05 | 2022-03-04 | 国网江苏省电力有限公司盐城供电分公司 | Control device capable of starting power communication equipment in regions |
| CN116316541A (en) * | 2022-10-31 | 2023-06-23 | 广东电网有限责任公司珠海供电局 | Power distribution network fault self-healing method for protecting control device and related device |
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