CN111049112A - Automatic fault isolation and self-healing control system and method for 10kV looped network distribution line - Google Patents
Automatic fault isolation and self-healing control system and method for 10kV looped network distribution line Download PDFInfo
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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
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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
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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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- 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
- H02H7/263—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 measured values
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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
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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
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/16—Electric power substations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention discloses a control system and a method for automatic fault isolation and self-healing of a 10kV ring network distribution line, wherein the system comprises a workstation, system software, a microcomputer comprehensive protection device, an intelligent gateway, a multifunctional power monitoring terminal A and a plurality of multifunctional power monitoring terminals B, wherein the microcomputer comprehensive protection device, the intelligent gateway and the multifunctional power monitoring terminal A are arranged in a switching station; the invention is based on the distributed high-speed real-time control network technology, and the field terminal devices such as the multifunctional power monitoring terminal, the intelligent gateway and the like are bound to establish the logical connection of node network variables, so that the interoperation and the network communication of the field node devices are realized, and the rapid linkage control can be realized without the remote intervention of a background monitoring center workstation. After the fault area is quickly positioned, the switches of all the nodes can be quickly coordinated and interlocked for control according to the running state of each switch in the 10kV ring network circuit and the fault logic program which is programmed in advance, so that the quick self-healing control of fault area isolation and power restoration in a non-fault area is realized.
Description
Technical Field
The invention belongs to the field of intelligent power distribution monitoring, and relates to a control system and method suitable for automatic fault isolation and fault self-healing of a 10kV ring network distribution line.
Background
At present, the network wiring types of the 10kV power distribution network in the domestic city are various and are divided into a radial type, a tree trunk type, a ring network type and the like. The ring network power supply has been widely constructed and applied due to low construction investment, high power supply operation reliability and flexible operation mode. However, because the 10kV ring network has various complex forms, and there are various types such as single ring network, double ring network, "two supply and one standby" and "three supply and one standby", how to rapidly realize automatic fault isolation and fault self-healing when the 10kV ring network distribution line has a fault, and rapidly recover the power supply of the non-fault area, thereby reducing the influence of long-time power failure on the order of production, life, teaching, etc., which is very important.
The traditional 10kV ring network distribution network mostly adopts a microcomputer comprehensive protection device configured on the side of a feeder line power supply and is used for protecting and controlling the whole ring network line. The protection mode is simple, the fault area cannot be accurately positioned when a fault occurs, operations such as fault finding, fault isolation and fault recovery need to be manually processed on site by operating personnel, the power failure time is long, the influence is wide, and the stable operation of the ring network power distribution system is not facilitated.
With the development of distribution automation technology, each node in some ring network lines is provided with a load switch and a Feeder Terminal Unit (FTU), the Feeder Terminal Unit (FTU) is used for collecting power parameters such as the state, current, voltage and the like flowing through the load switch, and a centralized control mode is adopted to realize the real-time monitoring of each node in the whole ring network line. The control mode is that collection of electric power parameters of each node in the looped network line is achieved by means of a master station of a distribution automation control system, and fault information and fault characteristics are judged according to the collected parameters, so that protection and control of the 10kV looped network distribution line are achieved. Because the RS485 bus technical system based on the Modbus protocol is adopted in most domestic automatic power distribution control systems at present, the technical route has low performance in the aspects of system transmission rate, transmission distance, anti-interference performance and the like, so that a series of processes of acquiring power parameters of each node by a master station after a fault occurs, judging fault information and fault characteristics and recovering power supply in a non-fault area until fault area isolation and non-fault area power supply are realized needs long time, and the overall real-time performance and accuracy of the system are poor. And because the RS485 bus technical system can not realize the interoperation of binding the network variables, once the backbone communication network of the distribution automation control system has a problem, the rapid linkage control between the equipment can not be realized, the dependence degree on the communication network is higher, and the overall reliability is poorer. Therefore, the control level of most domestic power distribution automatic control systems is generally low at present, and the automatic control systems cannot be applied to a complex 10kV looped network power distribution network system.
Disclosure of Invention
The invention aims to provide a control system and a method for automatic fault isolation and fault self-healing of a 10kV looped network distribution line, which have strong real-time performance and high reliability aiming at the characteristics of a more complex 10kV looped network distribution network; when the 10kV looped netowrk distribution lines broke down, realization fault location, fault isolation, self-healing control that can be quick reduced the influence of long-time power failure, was favorable to the steady operation of 10kV looped netowrk distribution network system.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a control system of 10kV looped netowrk distribution lines automatic fault isolation and self-healing, it includes surveillance center workstation, system software and locates computer integrated protection device, intelligent gateway, multi-functional electric power monitor terminal A in the switching station and locate a plurality of multi-functional electric power monitor terminal B of electric substation, computer integrated protection device and intelligent gateway are used for realizing the remote control to 10kV looped netowrk feeder power supply side return circuit with the surveillance center cooperation, multi-functional electric power monitor terminal A is used for monitoring the electric power operating parameter of 10kV looped netowrk feeder power supply side return circuit, multi-functional electric power monitor terminal B is used for monitoring the electric power operating parameter and the remote gate control of each node high-pressure inlet wire return circuit of 10kV looped netowrk, surveillance center workstation and system software are used for realizing the high-pressure return circuit electric power operating parameter real-time metering monitoring of 10kV looped netow, The intelligent network monitoring system comprises a switch running state monitoring device, a real-time alarm device and a human-computer interaction device, wherein field intelligent terminal devices such as an intelligent gateway and a multifunctional power monitoring terminal are used for realizing fault positioning, fault isolation, high-voltage interlocking control and network reconstruction of a 10kV looped network distribution line.
Furthermore, the system configures the optical fiber switch to establish an optical fiber private network, realizes seamless link between a backbone communication network and a field control subnet through a network controller, and achieves accurate issuing of a control command of a monitoring center and timely uploading of data of bottom equipment.
A control method for automatic fault isolation and self-healing of a 10kV looped network distribution line comprises the following steps:
(1) fault diagnosis: calculating rated current of a high-voltage incoming switch of each node in a line by combining rated capacity of transformers of each substation in a 10kV ring network line, setting different overload current thresholds at each monitoring terminal on site, and enabling the high-voltage switch to be switched off by sending a tripping signal through the terminal if each monitoring terminal on site monitors that actual running current is larger than the threshold; setting a switch 1 and a switch n as a high-voltage circuit breaker for a switching station feeder line power supply side loop, setting the switches 2 to n-1 as high-voltage load switches of ring network cabinets of nodes of 10kV ring networks of each substation, when an overload fault occurs in a line, performing protection action from a terminal 2 to a terminal n-1, and determining that a certain switch in the switches 2 to n-1 on the line trips so as to diagnose the overcurrent protection action; when an instantaneous short-circuit fault occurs in a line, a terminal 1 to a terminal n perform protection action, and a switch 1 or a switch n on the line trips, so that the current quick-break protection action is diagnosed;
(2) positioning a fault area: after the fault diagnosis is finished, the system quickly feeds back current and high-voltage switch state data acquired by each terminal in real time, and the current and high-voltage switch state data are compared with a protection setting value, so that the fault line area with the protection action is automatically and accurately positioned according to the current and high-voltage switch state data;
(3) fault area isolation: after the fault area is positioned, the related monitoring terminal of the fault area sends a control command to the adjacent high-voltage load switches on two sides of the fault area, so that the adjacent high-voltage load switches on two sides of the fault area are automatically switched off, and the quick and automatic isolation of the fault area is realized.
(4) Recovery of a non-failure area: after the fault area isolation is completed, the field terminal equipment performs interoperation of the field terminal equipment according to the network variable logical connection of the mutually bound nodes which is completed in advance, and automatically matches a fault processing plan; and each monitoring terminal sends a control command for recovering the compound brake to the load switch in the non-fault area including an open loop point, a power distribution network is rebuilt, and power supply is rapidly and automatically recovered to the non-fault area.
Furthermore, the ring network distribution line adopts a double-power-source hand-in-hand single-ring network wiring mode, a closed-loop design and an actual open-loop operation mode, a switch 1 and a switch n are set as high-voltage circuit breakers of a feeder power supply side loop of the switching station, and switches 2 to n-1 are high-voltage load switches of ring network cabinets of nodes of 10kV ring networks of each substation.
The invention has the beneficial effects that: the method solves the problems of higher time delay and lower accuracy of automatic fault diagnosis, fault positioning, fault area isolation and power restoration in a non-fault area under the condition that a 10kV ring network distribution network is relatively complex, overcomes the problem of higher dependence of traditional monitoring technology on a system communication network of fault isolation and self-healing control, and has the characteristics of strong real-time performance and high reliability. Meanwhile, the system background monitoring computer is combined to adopt various forms such as on-off state flashing, fault line flashing, popup window alarming, audible and visual alarming, voice alarming and the like, so that when the 10kV ring network distribution line has a fault, power is cut off for a short time to find a fault point, power supply can be recovered, the working time of power failure and recovery operation is greatly saved, and the stable operation of the 10kV ring network distribution network system is facilitated.
Drawings
FIG. 1 is a system block diagram of the present invention.
Fig. 2 is an exemplary diagram of a 10kV ring network distribution line.
Fig. 3 is a flow chart of a control method of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
The invention is based on the high-level automatic, informationized and intelligent distributed high-speed real-time control network technology, and utilizes the modern electronic technology, computer, communication technology, software technology and network technology to integrate the information of the online data, the offline data and the power grid structure data of the 10kV ring network power distribution network to form a complete 10kV ring network power distribution intelligent system, namely a control system for the automatic fault isolation and self-healing of the 10kV ring network power distribution line; and the monitoring, protection, control and scheduling of the 10kV ring network in a normal operation state and fault isolation and self-healing control in a fault state are realized by combining the control strategy optimization decision of an artificial intelligence method.
1. System architecture
The 10kV ring network power distribution intelligent system comprises intelligent monitoring equipment on field terminal layers such as a microcomputer comprehensive protection device, an intelligent gateway and a multifunctional power monitoring terminal, network equipment such as an optical fiber switch is configured to form an optical fiber private network, seamless connection between a backbone communication network and a field control subnet is achieved through a network controller, and the purposes of accurate issuing of a central control command of the monitoring system and timely uploading of bottom equipment data are achieved. The remote control of a 10kV ring network feeder line power supply side loop in the switching station is mainly realized by a microcomputer integrated protection device and an intelligent gateway, and the metering monitoring of electric power operation parameters is mainly realized by a multifunctional electric power monitoring terminal; the high-voltage incoming line loop of each node of the 10kV ring network in each substation is provided with a multifunctional power monitoring terminal, so that the metering monitoring of the power operation parameters of a high-voltage ring network cabinet in each substation and the remote opening and closing control are realized; the monitoring system center is provided with equipment such as a server, a workstation and the like and system application software, and functions of real-time metering monitoring of high-voltage loop power operation parameters, switch operation state monitoring, real-time alarming, man-machine interaction and the like of the 10kV ring network distribution line are realized; the network variable binding of field intelligent terminal equipment such as an intelligent gateway, a multifunctional power monitoring terminal and the like is used for realizing fault location, fault isolation, high-voltage interlocking control and network reconstruction of a 10kV ring network distribution line. The system structure is shown in figure 1.
2. Principle of control
The most frequently occurring line faults of the 10kV ring network power distribution system are short-circuit faults and overload faults, and the most frequently used corresponding protection is current quick-break protection and overcurrent protection. The traditional 10kV ring network power distribution monitoring mainly adopts a microcomputer comprehensive protection device, and the whole line of the 10kV ring network is monitored by setting different current setting values and time setting values in a loop at the side of a feeder line power supply. When short-circuit fault and overload fault occur on the whole line, the microcomputer integrated protection device monitors that current abnormal information on the line exceeds a setting value, and determines whether to alarm or send a tripping signal to the high-voltage circuit breaker to protect the whole line of the 10kV ring network. In a 10kV ring network distribution line, a current quick-break protection current setting value of a microcomputer integrated protection device is 5 times of rated current of the whole line, and a time setting value is 100 ms; the overcurrent protection current setting value is 1.2 times of the rated current of the whole line, and the time setting value is between 500ms and 700 ms.
The multifunctional power monitoring terminal is equipped in a high-voltage incoming line loop of each node of a 10kV ring network of each substation, based on a distributed high-speed real-time control network technology, current sampling of the multifunctional power monitoring terminal can be completed in a 50ms period after being registered in a metering chip, the current sampling is performed until the switching value output period is as fast as 150ms, and the current sampling is respectively smaller than a current quick-break protection and overcurrent protection current setting value of a microcomputer comprehensive protection device, so that when a 10kV ring network distribution line has permanent or instantaneous faults such as short circuit, overload and the like, each node of the 10kV ring network in each substation can be collected and monitored by a system in real time before a feeder line power supply side, and therefore, the fault area is positioned quickly.
The invention is based on the distributed high-speed real-time control network technology, and the field terminal devices such as the multifunctional power monitoring terminal, the intelligent gateway and the like in the field control network can establish the logical connection of the node network variables through binding, thereby realizing the interoperation and network communication of the field node devices and realizing the rapid linkage control without the remote intervention of a background monitoring center. Therefore, after the fault area is quickly positioned, the switches of all the nodes can be quickly coordinated and interlocked for control according to the running state of each switch in the 10kV ring network circuit and the fault logic program which is programmed in advance, and the quick self-healing control of fault area isolation and power supply recovery of the non-fault area is realized.
3. Control strategy
The invention takes a double-power-source hand-in-hand single-ring network wiring mode as an example, and combines the most common current quick-break protection and overcurrent protection of a 10kV ring network power distribution system to respectively explain the control strategies of automatic fault isolation and fault self-healing.
(1) Normal operation mode
Taking fig. 2 as an example, a closed-loop design and an actual open-loop operation mode are adopted in a normal situation, a switch 1 and a switch n are high-voltage circuit breakers of a feeder power supply side loop of a switching station, and a switch 2 to a switch n-1 are high-voltage load switches of ring main units of nodes of a 10kV ring network of each substation. In the normal operation mode, the primary current of each switch from the switch 1 to the switch 3 flows from large to small in sequence according to the load state of the substation, namely I1＝I2>I30; similarly, the current flowing from the switch n to the switch 5 is also sequentially from large to small, i.e. In＝In-1>In-2>…>I5。
(2) Fault diagnosis
According to the principle, the rated current of the high-voltage incoming line switch of each node in the line is calculated by combining the rated capacity of the transformer of each substation in the 10kV looped network line. Different overload current thresholds are set from the terminal 1 to the terminal n through the intelligent power distribution system, and if the actual operation current monitored by each terminal on site is larger than the threshold, the terminal sends a tripping signal to enable the high-voltage switch to be switched off. When an overload fault occurs in a circuit, a terminal 2 to a terminal n-1 carry out protection action, and a switch 2 to a switch n-1 on the circuit must have trip action, so that the diagnosis is the overcurrent protection action; when an instantaneous short-circuit fault occurs in the line, the terminal 1 to the terminal n perform protection action, and the switch 1 or the switch n on the line trips, so that the current quick-break protection action is diagnosed. And according to the logic judgment, the automatic fault diagnosis of the 10kV ring network line is realized.
(3) Fault area location
After the fault diagnosis is finished, the system quickly feeds back data such as current, high-voltage switch state and the like acquired by each terminal in real time, and compares the data with a protection setting value, so that the fault line area with the protection action is automatically and accurately positioned according to the data.
(4) Fault zone isolation
After the fault area is positioned, the related monitoring terminal of the fault area sends a control command to the adjacent high-voltage load switches on two sides of the fault area, so that the adjacent high-voltage load switches on two sides of the fault area are automatically switched off, and the quick and automatic isolation of the fault area is realized.
(5) Non-failing zone recovery
After the fault area isolation is completed, the field terminal equipment performs interoperation of the field terminal equipment according to the network variable logical connection of the mutually bound nodes which is completed in advance, and automatically matches a fault processing plan. And each monitoring terminal sends a control command for recovering closing to a load switch (including an open loop point) in the non-fault area, a power distribution network is rebuilt, and power supply is rapidly and automatically recovered to the non-fault area.
And after the control logic is completed, the 10kV ring network distribution line is in an abnormal operation mode. According to the rated current of the high-voltage incoming line switch of each node in the line in the abnormal operation mode, which is calculated in advance, the overload current threshold value from the terminal 1 to the terminal n in the operation mode is issued again through the intelligent power distribution system, and the 10kV ring network distribution line in the operation mode is protected.
In conclusion, the intelligent system can be widely applied to power distribution network intelligent systems of various power consumer objects, including various large public buildings such as government offices, schools, hospitals and businesses, large traffic users such as subways, highway highways and ports, various industrial enterprises, and users such as large parks and residential districts. The invention has strong popularization value, can save a large amount of time and cost while ensuring the safety and stability of power consumption of a user side power grid, and avoids unnecessary property loss caused by long time consumption after power failure, thereby ensuring the safe and stable operation of the whole power distribution system, improving the power supply reliability and the power supply quality, and promoting the construction of an intelligent power distribution network.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the scope of the present invention in any way, and all technical solutions obtained by using equivalent substitution methods fall within the scope of the present invention.
The parts not involved in the present invention are the same as or can be implemented using the prior art.
Claims (4)
1. The utility model provides a control system of automatic fault isolation of 10kV looped netowrk distribution lines and self-healing, its characterized in that, include surveillance center workstation, system software and locate microcomputer integrated protection device, intelligent gateway, multi-functional electric power monitor terminal A in the switching station and locate a plurality of multi-functional electric power monitor terminal B of electric substation, microcomputer integrated protection device and intelligent gateway are used for realizing 10kV looped netowrk feeder power supply side return circuit remote control with surveillance center workstation and system software cooperation, multi-functional electric power monitor terminal A is used for monitoring the electric power operating parameter of 10kV looped netowrk feeder power supply side return circuit, multi-functional electric power monitor terminal B is used for monitoring the electric power operating parameter and the long-range divide-shut brake control of each node high-voltage inlet wire return circuit of 10kV looped netowrk, surveillance center workstation and system software are used for realizing the real-time measurement monitoring of the high-voltage return circuit electric power operating parameter of, The intelligent network monitoring system comprises a switch running state monitoring device, a real-time alarm device and a human-computer interaction device, wherein field intelligent terminal devices such as an intelligent gateway and a multifunctional power monitoring terminal are used for realizing fault positioning, fault isolation, high-voltage interlocking control and network reconstruction of a 10kV looped network distribution line.
2. The control system for automatic fault isolation and self-healing of the 10kV ring network distribution line according to claim 1, wherein the system is configured with an optical fiber switch to establish an optical fiber private network, and seamless connection between a backbone communication network and a field control subnet is realized through a network controller, so that accurate issuing of a control command of a monitoring center and timely uploading of data of underlying equipment are achieved.
3. A control method for automatic fault isolation and self-healing of a 10kV looped network distribution line is characterized by comprising the following steps:
(1) fault diagnosis: calculating rated current of a high-voltage incoming switch of each node in a line by combining rated capacity of transformers of each substation in a 10kV ring network line, setting different overload current thresholds at each monitoring terminal on site, and enabling the high-voltage switch to be switched off by sending a tripping signal through the terminal if each monitoring terminal on site monitors that actual running current is larger than the threshold; according to the structure of a 10kV ring network distribution line, a switch 1 and a switch n are set as high-voltage circuit breakers of a switching station feeder line power supply side loop, switches 2 to n-1 are high-voltage load switches of ring network cabinets of nodes of 10kV ring networks of each substation, when an overload fault occurs in the line, a protection action is carried out from a terminal 2 to a terminal n-1, and a certain switch is tripped in the switches 2 to n-1 on the line, so that the diagnosis is an overcurrent protection action; when an instantaneous short-circuit fault occurs in a line, a terminal 1 to a terminal n perform protection action, and a switch 1 or a switch n on the line trips, so that the current quick-break protection action is diagnosed;
(2) positioning a fault area: after the fault diagnosis is finished, the system quickly feeds back current and high-voltage switch state data acquired by each terminal in real time, and the current and high-voltage switch state data are compared with a protection setting value, so that the fault line area with the protection action is automatically and accurately positioned according to the current and high-voltage switch state data;
(3) fault area isolation: after the fault area is positioned, the related monitoring terminal of the fault area sends a control command to the adjacent high-voltage load switches on two sides of the fault area, so that the adjacent high-voltage load switches on two sides of the fault area are automatically switched off, and the quick and automatic isolation of the fault area is realized.
(4) Recovery of a non-failure area: after the fault area isolation is completed, the field terminal equipment performs interoperation of the field terminal equipment according to the network variable logical connection of the mutually bound nodes which is completed in advance, and automatically matches a fault processing plan; and each monitoring terminal sends a control command for recovering the compound brake to the load switch in the non-fault area including an open loop point, a power distribution network is rebuilt, and power supply is rapidly and automatically recovered to the non-fault area.
4. The method for controlling automatic fault isolation and self-healing of the 10kV ring network distribution line according to claim 3, wherein the ring network distribution line adopts a dual-power-source hand-in-hand single-ring network wiring mode, a closed-loop design and an actual open-loop operation mode, and a switch 1 and a switch n are set as high-voltage circuit breakers of a feeder power supply side loop of the switching station, and switches 2 to n-1 are high-voltage load switches of ring network cabinets of nodes of the 10kV ring network of each substation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911402616.0A CN111049112B (en) | 2019-12-31 | 2019-12-31 | Automatic fault isolation and self-healing control system and method for 10kV looped network distribution line |
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