CN105375635A - Method and system of intelligent management of power distribution network cascading switching stations - Google Patents
Method and system of intelligent management of power distribution network cascading switching stations Download PDFInfo
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- CN105375635A CN105375635A CN201510871125.6A CN201510871125A CN105375635A CN 105375635 A CN105375635 A CN 105375635A CN 201510871125 A CN201510871125 A CN 201510871125A CN 105375635 A CN105375635 A CN 105375635A
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000004891 communication Methods 0.000 claims abstract description 49
- 239000013307 optical fiber Substances 0.000 claims abstract description 32
- 238000002955 isolation Methods 0.000 claims abstract description 24
- 230000001681 protective effect Effects 0.000 claims abstract description 4
- 238000013024 troubleshooting Methods 0.000 claims description 44
- 238000007726 management method Methods 0.000 claims description 26
- 230000009471 action Effects 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 13
- 230000005540 biological transmission Effects 0.000 claims description 11
- 238000012544 monitoring process Methods 0.000 claims description 8
- 230000003287 optical effect Effects 0.000 claims description 8
- 238000004458 analytical method Methods 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 6
- 230000002452 interceptive effect Effects 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 claims description 4
- 239000012141 concentrate Substances 0.000 claims description 3
- 230000001186 cumulative effect Effects 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 3
- 230000006837 decompression Effects 0.000 description 10
- 230000005611 electricity Effects 0.000 description 5
- 238000010276 construction Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
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Classifications
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- H02J13/0006—
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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
- H02H7/22—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 for distribution gear, e.g. bus-bar systems; for switching devices
-
- 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
- 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
- H02J13/00019—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 optical means
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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
- Y04S10/20—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
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Small-Scale Networks (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The present invention discloses a method and system of intelligent management of a power distribution network cascading switching stations. The main technical scheme of the invention comprises at least two switching stations, and optical fiber ring networks are arranged between the switching stations; and each switching station is provided with one fault processing terminal, each fault processing terminal is connected with one optical fiber ring network through an Ethernet switch, each fault processing terminal is connected with a communication server, and all the communication servers are connected with a distribution master station. According to the invention, the ideas of differential protection and direction protection of circuit optical fibers are introduced in the fault processing of the power distribution network, and a system of intelligent management of power distribution network cascading switching stations is formed according to the power supply relation. Rapid communication between terminals is performed through a unit network, and fault signals are only transmitted, therefore the selection of protective actions when feeders have faults is solved through autonomous consultation, and one-time fault isolation is realized.
Description
technical field:
The present invention relates to a kind of power distribution network cascade switching station to safeguard and management, particularly relate to a kind of power distribution network cascade switching station intelligent management and system.
background technology:
Along with the development of national economy and improving constantly of the people's material and cultural life level, the requirement of user to power supply reliability is also more and more higher.Have a power failure and not only bring inconvenience to the life of people, bring very large economic loss, and very large negative effect can be caused to society.Correlative study shows often to stop kilowatt-hour on average can bring 40 yuan economic loss to user, and China is every year because the economic loss caused that has a power failure reaches hundreds billion of unit.So the power supply reliability of power distribution network is badly in need of improving, the troubleshooting problem solving power distribution network improves the key of distribution network reliability.
Zhengzhou is state's net company power distribution automation experimental city, current Yi Zhengdong new district and new and high-tech development zone set up electrical power distribution automatization system, what adopt is main website+DTU pattern, and main website carries out running state analysis and the monitoring of power distribution network according to the equipment real time information that DTU uploads.When this pattern is fault generation, substation exit switch trip excision fault, then information is uploaded to main website, remote control combined floodgate is carried out after main station judging fault section, recover non-faulting block supply, some problems of existence of this troubleshooting pattern, find some shortcomings in running: DTU does not possess trip protection function, fault is bypassed the immediate leadership after occurring to transformer station's tripping operation, expands accident impact; Troubleshooting controls in main website, Fault Isolation and the service restoration time longer, be generally 20-30 second; Communication dependency degree is high, and Fault Isolation and service restoration are subject to the impact of communication link.
summary of the invention:
Technical problem to be solved by this invention is: overcome the deficiencies in the prior art, provides a kind of reasonable in design, simple and practical, handling failure quick and reduces power distribution network cascade switching station intelligent management and the system of interruption duration.
Technical scheme of the present invention is:
1, a power distribution network cascade switching station intelligent management, comprises the following steps:
A, between all switching stations, be configured with optical fiber ring network, switching station described in each is provided with troubleshooting terminal, described in each, troubleshooting terminal is all connected with described optical fiber ring network by Ethernet switch, high-speed traffic between range site network between described troubleshooting terminal, only transmit fault-signal, autonomous negotiating, solves the selectivity of protection act during feeder fault, realizes Fault Isolation once;
B, by means of circuit optical fiber passage, sampled data is transmitted in real time to offside, accept the sampled data of offside simultaneously, each side Sustainable use local with offside current data by carrying out differential current calculating mutually, braking characteristic equation according to current differential protection differentiates, action tripping operation when being judged to troubles inside the sample space, when being judged to external area error, protection is failure to actuate, and utilize directional power relay or power directional element to judge the direction of short-circuit power is to select the corresponding protective device action of startup simultaneously;
C, to switchgear distribution pilot protection different in switching station, intelligent failure protection, overcurrent protection and fast tripping protection; Fault Isolation and service restoration is realized by mutually consulting not rely on the main website troubleshooting completed between cascade switching station; simultaneously; the voltage collected, electric current, power, the position of the switch, fault message etc. by Optical Fiber Transmission to distribution main website, carry out the real time monitoring of power distribution network and analysis, remote control.
Self whether quick acting is determined according to the fault message of self and adjacent switch when breaking down; Failure protection is when subordinate's switch failure, and the failure protection of higher level's switch is without time delay tripping higher level switch, and excision fault, eliminates the cumulative effect of time delay step by step of conventional overcurrent backup protection, shortens fault clearing time.
When system jam, detect that the terminal of fault current can send the fault message of self at once, carry out Judging fault section, if terminal oneself detects fault according to the information receiving adjacent end simultaneously, secondary terminal does not detect fault, then pilot protection action at once excision fault; If terminal oneself detects fault, secondary terminal is detection failure also, then the pilot protection of terminal locking self; standby failure protection monitors the action situation of subordinate's switch, subordinate's switch regular event, and fault is isolated; if subordinate's switch failure, then intelligent failure protection action at once excision fault.
In opening and closing standing, which, terminal is by signal of telecommunication interactive information, stands internal fault no longer to station extension; Between standing, terminal is by light signal interactive information; realize the process of fault between station; by the whole network Millisecond pilot protection; the switch trip nearest from fault point; configure intelligent failure protection is backup protection simultaneously, and definite value adapts to the supply power mode in different electrical power direction automatically, guarantees the correctness that definite value coordinates; reduce power failure range, accelerate troubleshooting and service restoration.
Fault Isolation and service restoration do not rely on main website, according to distribution rack once and power supply relation thereof, form electrical power distribution automatization system among a small circle, avoid troubleshooting to concentrate on main website, carry out Fault Isolation and service restoration by distribution terminal autonomous negotiating.
Described in each, troubleshooting terminal is provided with communication server, and all described communication servers are all connected with distribution main website, and Detection Information and process information are transferred in distribution main website in time.
Backup protection can be dropped into during system communication fault, backup protection only adopts the logical relation between false voltage between the inner or switching station of switching station, fault current, and integrated use switching station internal logic judges to control on the spot, voltage and power direction coordinates, the differential technology of switching station node time; Automatic calculating, judgement, process realize the service restoration in Fault Isolation between level Four cascade switching station and non-faulting region; Simultaneously the voltage collected, electric current, power, the position of the switch, fault message etc. by GPRS transmission to distribution main website, to carry out real time monitoring and the analysis of power distribution network; The troubleshooting of switching station and service restoration do not rely on GPRS communication, and GPRS communication is only as data transmission channel.
In conjunction with first half-wave and zero-sequence current colony amplitude comparison phase comparing method, the zero-sequence current gathering all outlets on bus first carries out amplitude com parison, select and cross the several circuit of setting value and carry out 1/4 cycle phase compare again, if the phase place of certain circuit zero-sequence current is different from other circuit, then it is faulty line, if all zero-sequence current same-phases, it is then busbar fault, adopt the current transformer that there is Weak current and detect, primary current just enters linear transformation at tens milliamperes, big current speed per hour is saturated, exciting current is faint, secondary can export milliampere level, ensure to gather the accurate of electric current.
A kind of power distribution network cascade switching station intelligent management system, comprise at least two switching stations, optical fiber ring network is configured with between all described switching stations, switching station described in each is provided with troubleshooting terminal, described in each, troubleshooting terminal is all connected with described optical fiber ring network by Ethernet switch, described in each, troubleshooting terminal is provided with communication server, and all described communication servers are all connected with distribution main website.
Described troubleshooting terminal is arranged in the rack in described switching station or switchgear house; Described communication server comprises OLT device, ONU equipment and optical splitter; Described OLT device adopts many PON jaws equipment, and described ONU equipment selects connecting port on double-PON port, and second line of a couplet automatization terminal adopts network interface.
The invention has the beneficial effects as follows:
1, the function of troubleshooting is transferred in terminal by the present invention; when line failure, do not rely on communication or main website, carry out troubleshooting mainly through autonomous negotiating between terminal; make the switch nearest from fault point protection act at first, farthest reduce power failure range.
2, the thought of circuit optical fiber differential protection and direction protection is introduced the troubleshooting of power distribution network by the present invention, forms power distribution network cascade switching station intelligent management system according to power supply relation.Between terminal, high-speed traffic between range site network, only transmits fault-signal, autonomous negotiating, solves the selectivity of protection act during feeder fault, realizes Fault Isolation once.
3, the present invention be to existing electrical power distribution automatization system supplement and perfect, be also the lifting to existing electrical power distribution automatization system function, and then better realize the application of power distribution automation main website Premium Features, be convenient to carry out distribution management to whole power distribution network.
4, be without main structure between present system; by the industrial optical fiber ethernet module composition looped network that system is built-in; to switchgear distribution pilot protection different in switching station, intelligent failure protection, overcurrent protection, fast tripping protection etc., realize Fault Isolation and service restoration by mutually consulting not rely on the main website troubleshooting completed between cascade switching station.
5, soon, between switching station, terminal equipment utilizes the process of optical-fibre communications autonomous negotiating for Fault Isolation of the present invention and service restoration, with the speed isolated fault of Millisecond, adapts to electric network composition complicated arbitrarily.Whole process of fault isolation does not need main website to participate in.
6, the present invention is reasonable in design, simple and practical, handling failure quick and minimizing interruption duration, and it is applied widely, is easy to promotion and implementation, has good economic benefit.
accompanying drawing illustrates:
Fig. 1 is the structure chart of power distribution network cascade switching station intelligent management system;
Fig. 2 is that power distribution network cascade switching station intelligent management system implements one of structure chart;
Fig. 3 is that power distribution network cascade switching station intelligent management system implements structure chart two.
embodiment:
Embodiment: see Fig. 1-Fig. 3, in figure, 1-troubleshooting terminal, 2-communication server, 3-Ethernet switch, 4-optical fiber ring network, 5-distribution main website.
A kind of power distribution network cascade switching station intelligent management, comprises the following steps:
A, between all switching stations, be configured with optical fiber ring network 4, each switching station is provided with troubleshooting terminal 1, each troubleshooting terminal 1 is all connected with optical fiber ring network 4 by Ethernet switch 3, high-speed traffic between range site network between troubleshooting terminal 1, only transmit fault-signal, autonomous negotiating, solves the selectivity of protection act during feeder fault, realizes Fault Isolation once;
B, by means of circuit optical fiber passage, sampled data is transmitted in real time to offside, accept the sampled data of offside simultaneously, each side Sustainable use local with offside current data by carrying out differential current calculating mutually, braking characteristic equation according to current differential protection differentiates, action tripping operation when being judged to troubles inside the sample space, when being judged to external area error, protection is failure to actuate, and utilize directional power relay or power directional element to judge the direction of short-circuit power is to select the corresponding protective device action of startup simultaneously;
C, to switchgear distribution pilot protection different in switching station, intelligent failure protection, overcurrent protection and fast tripping protection; Fault Isolation and service restoration is realized by mutually consulting not rely on the main website troubleshooting completed between cascade switching station; simultaneously; the voltage collected, electric current, power, the position of the switch, fault message etc. by Optical Fiber Transmission to distribution main website 5, carry out the real time monitoring of power distribution network and analysis, remote control.
Self whether quick acting is determined according to the fault message of self and adjacent switch when breaking down; Failure protection is when subordinate's switch failure, and the failure protection of higher level's switch is without time delay tripping higher level switch, and excision fault, eliminates the cumulative effect of time delay step by step of conventional overcurrent backup protection, shortens fault clearing time.
When system jam, detect that the terminal of fault current can send the fault message of self at once, carry out Judging fault section, if terminal oneself detects fault according to the information receiving adjacent end simultaneously, secondary terminal does not detect fault, then pilot protection action at once excision fault; If terminal oneself detects fault, secondary terminal is detection failure also, then the pilot protection of terminal locking self; standby failure protection monitors the action situation of subordinate's switch, subordinate's switch regular event, and fault is isolated; if subordinate's switch failure, then intelligent failure protection action at once excision fault.
In opening and closing standing, which, terminal is by signal of telecommunication interactive information, stands internal fault no longer to station extension; Between standing, terminal is by light signal interactive information; realize the process of fault between station; by the whole network Millisecond pilot protection; the switch trip nearest from fault point; configure intelligent failure protection is backup protection simultaneously, and definite value adapts to the supply power mode in different electrical power direction automatically, guarantees the correctness that definite value coordinates; reduce power failure range, accelerate troubleshooting and service restoration.
Fault Isolation and service restoration do not rely on main website, according to distribution rack once and power supply relation thereof, form electrical power distribution automatization system among a small circle, avoid troubleshooting to concentrate on main website, carry out Fault Isolation and service restoration by distribution terminal autonomous negotiating.
Described in each, troubleshooting terminal is provided with communication server 2, and all communication servers 2 are all connected with distribution main website 5, and Detection Information and process information are transferred in distribution main website 5 in time.
Backup protection can be dropped into during system communication fault, backup protection only adopts the logical relation between false voltage between the inner or switching station of switching station, fault current, and integrated use switching station internal logic judges to control on the spot, voltage and power direction coordinates, the differential technology of switching station node time; Automatic calculating, judgement, process realize the service restoration in Fault Isolation between level Four cascade switching station and non-faulting region; Simultaneously the voltage collected, electric current, power, the position of the switch, fault message etc. by GPRS transmission to distribution main website, to carry out real time monitoring and the analysis of power distribution network; The troubleshooting of switching station and service restoration do not rely on GPRS communication, and GPRS communication is only as data transmission channel.
In conjunction with first half-wave and zero-sequence current colony amplitude comparison phase comparing method, the zero-sequence current gathering all outlets on bus first carries out amplitude com parison, select and cross the several circuit of setting value and carry out 1/4 cycle phase compare again, if the phase place of certain circuit zero-sequence current is different from other circuit, then it is faulty line, if all zero-sequence current same-phases, it is then busbar fault, adopt the current transformer that there is Weak current and detect, primary current just enters linear transformation at tens milliamperes, big current speed per hour is saturated, exciting current is faint, secondary can export milliampere level, ensure to gather the accurate of electric current.
Troubleshooting terminal 1 is arranged in the rack in switching station or switchgear house; Communication server 2 comprises OLT device, ONU equipment and optical splitter; OLT device adopts many PON jaws equipment, and ONU equipment selects connecting port on double-PON port, and second line of a couplet automatization terminal adopts network interface.
1.1 local power distribution automation schemes
Be applicable to the distribution network of any cascade connection, switching station can be comprised, troubleshooting is quick, reliable, be described with level Four switching station below.
By 8 plates, 31 plates of transformer station A, 23 plates of transformer station B, 3 plates and 1#, 2#, 3#, 4# switching station constitute the looped network hand in hand of a level Four cascade switching station.System construction drawing is illustrated in fig. 2 shown below:
1.1.1 fault of interconnected transmission line
Suppose that between 2#, 3# switching station, interconnection breaks down, fault treating procedure is as follows:
1) 1#8DL, 1#7DL, 2#8DL, 2#7DL all experience overcurrent, and 3#8DL does not have overcurrent, and switch is consulted by the exchange of fault message, judge that fault section is between 2#7DL, 3#8DL;
2) 1#8DL, 1#7DL, 2#8DL locking pilot protection;
3) 2#7DL pilot protection tripping operation, fault is cut;
4) 3#8DL inlet wire o-volt protection tripping operation, fault is isolated; The one-sided decompression time-delay closing of 3#11DL, non-faulting section service restoration;
5) system sends SMS notification related personnel:
A) 2# switching station interconnection 7DL trip protection, fault is isolated;
B) 3# switching station inlet wire 8DL trips, and 11DL closes a floodgate, and non-faulting region restores electricity.
1.1.2 busbar fault
Suppose that 2# switching station bus breaks down, fault treating procedure is as follows:
1) 1#8DL, 1#7DL, 2#8DL experience overcurrent, and all outlets on 2#I section bus all do not have overcurrent, are consulted by the exchange of fault message, judge that fault occurs on the I section bus of 2#;
2) 2#8DL pilot protection action tripping operation, the o-volt protection of 3#8DL inlet wire is tripped, and fault is isolated;
3) the one-sided decompression time-delay closing of 3#11DL, non-faulting section service restoration;
4) system sends SMS notification related personnel:
A) 2# switching station I section of busbar fault, 8DL overcurrent protection is tripped, and fault is isolated;
B) 3# switching station inlet wire 8DL trips, and fault is isolated;
C) 3# switching station mother 11DL closes a floodgate, and non-faulting region restores electricity.
1.1.3 subscriber line out of order
Suppose that 2# switching station subscribers feeder breaks down, fault treating procedure is as follows:
1) 1#8DL, 1#7DL, 2#8DL, 2#6DL experience over-current signal, and 1#8DL, 1#7DL, 2#8DL are consulted by the exchange of fault message, are judged as external area error;
2) 1#8DL, 1#7DL, 2#8DL locking pilot protection;
3) 2#6DL fast tripping protection action tripping operation, fault is isolated;
4) system sends SMS notification related personnel: 2# switching station interconnection 6DL trip protection, fault is isolated.
1.1.4 communication failure
Suppose that between 2#, 3# switching station, interconnection breaks down.When normal communication, the communication conditions of each device between real time monitoring and the superior and the subordinate stand, if 3# switching station is when fault, occur Communication, fault treating procedure is as follows:
1) when communicating 2# and 3# electric substation communication failure, 2#7DL, 3#8DL locking pilot protection, 2#7DL standby overcurrent protection starts excision fault;
2) 3#8DL trips after decompression, isolated fault, time-delay closing after the one-sided decompression of 3#11DL, non-faulting section service restoration;
3) system sends SMS notification related personnel:
A) 2# switching station interconnection 7DL trip protection, fault is isolated;
B) 3# switching station inlet wire 8DL trips, and 11DL closes a floodgate, and non-faulting region restores electricity.
1.2 without local power distribution automation scheme during communication
Be applicable to the distribution network that cascade connection is no more than level Four, be described with level Four switching station below being.
By 8 plates, 31 plates of transformer station A, 23 plates of transformer station B, 3 plates and 1#, 2#, 3# switching station constitute the looped network hand in hand of 3 grades of cascade switching stations.System construction drawing is illustrated in fig. 3 shown below:
1.2.1 fault of interconnected transmission line
Suppose that between 1#, 2# switching station, interconnection breaks down, fault treating procedure is as follows:
1) 1# switching station 7DL has the fast tripping protection tripping operation of differential time delay;
2) 2# switching station service entrance switch 8DL decompression tripping operation, fault is isolated;
3) the one-sided decompression of 2# switching station bus connection switch 11DL is closed a floodgate, non-faulting section service restoration;
4) system sends SMS notification related personnel:
A) 1# switching station interconnection 7DL overcurrent protection tripping operation, fault is isolated
B) 2# switching station inlet wire 8DL decompression tripping operation, 11DL closes a floodgate, and non-faulting region restores electricity.
1.2.2 busbar fault
Suppose that 1# switching station I section of bus breaks down, fault treating procedure is as follows
1) 1# switching station 8DL has the fast tripping protection tripping operation of differential time delay;
2) 2# switching station service entrance switch 8DL decompression tripping operation, fault is isolated;
3) the one-sided decompression of 2# switching station bus connection switch 11DL is closed a floodgate, non-faulting section service restoration;
4) system sends SMS notification related personnel:
A) 1# switching station I section of busbar fault, 8DL overcurrent protection is tripped, and fault is isolated;
B) 2# switching station inlet wire 8DL decompression tripping operation, fault is isolated;
C) 2#11DL closes a floodgate, and non-faulting region restores electricity.
1.2.3 subscriber line out of order
Suppose that 1# switching station 6DL breaks down, fault treating procedure is as follows:
1) 1# switching station 6DL time delay overcurrent protection in 0 second tripping operation, Fault Isolation;
2) system sends SMS notification related personnel: 1# switching station 6DL fault, fault is isolated.
1.3 communication scheme explanations
Communication is that the fiber optic loop of fast failure process use and the fiber optic loop of upper main website can be unified for same optical cable, in order to ensure enough reserving, advises 4 core optical cables how for subsequent use.
(1) power distribution network cascade switching station intelligent management system optical-fibre communications scheme
System rapid communication optical fiber ring network used at least needs the optical cable of 2 cores, can utilize the spare fibre of current distribution automation system, provide 2 core fibres to complete optical fiber ring network between the switching station of mutual cascade.
The switching station of mutual cascade or the backbone of ring main unit form an optical fiber ring network, if the heartbeat message between the information spinner switch on looped network and fault message.
The required optical communication equipment of power distribution network cascade switching station intelligent management system configuration.
(2) main website communication scheme on optical fiber
The information such as real time data, event, troubleshooting result of local distribution power automation terminal equipment is linked in the middle of existing distribution automation main website by communication server.
A, communication network adopt hierarchy: build up a laterally contact, longitudinally through IP-based data network.From top to bottom successively: backbone layer, Access Layer.
Backbone layer: access main platform (electric company) by the electrical integrated communication of adapted and access sub-platform (being located at each transformer station that there is 10kV outlet in city) to each adapted telecommunication.Realized by optical fiber.
Access Layer: access sub-platform by each adapted telecommunication and be press-fitted electric terminal in each.Access sub-platform by each adapted telecommunication and be press-fitted electric terminal in each.
B, communication mode, based on optical fiber communication, adopt EPON networking mode.
C, consideration circuit all adopt optical fiber, and Preliminary design adopts nonmetal fire-retardant cable.
D, communication apparatus: OLT device, equipment adopts many PON jaws equipment, can continue to use transformer station's existing device; ONU equipment, selects connecting port on double-PON port, and second line of a couplet automatization terminal adopts network interface; Optical splitter, connects OLT and ONU equipment.
The thought of circuit optical fiber differential protection and direction protection is introduced the troubleshooting of power distribution network by the present invention, forms power distribution network cascade switching station intelligent management system according to power supply relation.Between terminal, high-speed traffic between range site network, only transmits fault-signal, autonomous negotiating, solves the selectivity of protection act during feeder fault, realizes Fault Isolation once.
The present invention has the switching station construction unit network of cascade connection, and by interacted light signal quick in terminal, configuration pilot protection, intelligent failure protection, achieve the whole network pilot protection, without time differential accumulative intelligent failure protection; Still can be realized the automatic process of fault by backup protection during communication failure; Main website primary responsibility data acquisition and event is browsed and the Premium Features such as distribution management, network reconfiguration, main website and the terminal division of labor is clear and definite, Each performs its own functions; By the temperature of switching station, humidity, air draft, draining connecting system, the monitor and forecast of switching station operating mode can be realized.
Claims (10)
1. a power distribution network cascade switching station intelligent management, comprises the following steps:
A, between all switching stations, be configured with optical fiber ring network, switching station described in each is provided with troubleshooting terminal, described in each, troubleshooting terminal is all connected with described optical fiber ring network by Ethernet switch, high-speed traffic between range site network between described troubleshooting terminal, only transmit fault-signal, autonomous negotiating, solves the selectivity of protection act during feeder fault, realizes Fault Isolation once;
B, by means of circuit optical fiber passage, sampled data is transmitted in real time to offside, accept the sampled data of offside simultaneously, each side Sustainable use local with offside current data by carrying out differential current calculating mutually, braking characteristic equation according to current differential protection differentiates, action tripping operation when being judged to troubles inside the sample space, when being judged to external area error, protection is failure to actuate, and utilize directional power relay or power directional element to judge the direction of short-circuit power is to select the corresponding protective device action of startup simultaneously;
C, to switchgear distribution pilot protection different in switching station, intelligent failure protection, overcurrent protection and fast tripping protection; Fault Isolation and service restoration is realized by mutually consulting not rely on the main website troubleshooting completed between cascade switching station; simultaneously; the voltage collected, electric current, power, the position of the switch, fault message etc. by Optical Fiber Transmission to distribution main website, carry out the real time monitoring of power distribution network and analysis, remote control.
2. power distribution network cascade switching station intelligent management according to claim 1, is characterized in that: determine self whether quick acting according to the fault message of self and adjacent switch when breaking down; Failure protection is when subordinate's switch failure, and the failure protection of higher level's switch is without time delay tripping higher level switch, and excision fault, eliminates the cumulative effect of time delay step by step of conventional overcurrent backup protection, shortens fault clearing time.
3. power distribution network cascade switching station intelligent management according to claim 1, it is characterized in that: when system jam, detect that the terminal of fault current can send the fault message of self at once, carry out Judging fault section according to the information receiving adjacent end simultaneously, if terminal oneself detects fault, secondary terminal does not detect fault, then pilot protection action at once excision fault; If terminal oneself detects fault, secondary terminal is detection failure also, then the pilot protection of terminal locking self; standby failure protection monitors the action situation of subordinate's switch, subordinate's switch regular event, and fault is isolated; if subordinate's switch failure, then intelligent failure protection action at once excision fault.
4. power distribution network cascade switching station intelligent management according to claim 1, is characterized in that: in opening and closing standing, which, terminal is by signal of telecommunication interactive information, stands internal fault no longer to station extension; Between standing, terminal is by light signal interactive information; realize the process of fault between station; by the whole network Millisecond pilot protection; the switch trip nearest from fault point; configure intelligent failure protection is backup protection simultaneously, and definite value adapts to the supply power mode in different electrical power direction automatically, guarantees the correctness that definite value coordinates; reduce power failure range, accelerate troubleshooting and service restoration.
5. power distribution network cascade switching station intelligent management according to claim 1, it is characterized in that: Fault Isolation and service restoration do not rely on main website, according to distribution rack once and power supply relation thereof, form electrical power distribution automatization system among a small circle, avoid troubleshooting to concentrate on main website, carry out Fault Isolation and service restoration by distribution terminal autonomous negotiating.
6. power distribution network cascade switching station intelligent management according to claim 1, it is characterized in that: described in each, troubleshooting terminal is provided with communication server, all described communication servers are all connected with distribution main website, and Detection Information and process information are transferred in distribution main website in time.
7. power distribution network cascade switching station intelligent management according to claim 1, it is characterized in that: during system communication fault, can backup protection be dropped into, backup protection only adopts the logical relation between false voltage between the inner or switching station of switching station, fault current, and integrated use switching station internal logic judges to control on the spot, voltage and power direction coordinates, the differential technology of switching station node time; Automatic calculating, judgement, process realize the service restoration in Fault Isolation between level Four cascade switching station and non-faulting region; Simultaneously the voltage collected, electric current, power, the position of the switch, fault message etc. by GPRS transmission to distribution main website, to carry out real time monitoring and the analysis of power distribution network; The troubleshooting of switching station and service restoration do not rely on GPRS communication, and GPRS communication is only as data transmission channel.
8. power distribution network cascade switching station intelligent management according to claim 1, it is characterized in that: in conjunction with first half-wave and zero-sequence current colony amplitude comparison phase comparing method, the zero-sequence current gathering all outlets on bus first carries out amplitude com parison, select and cross the several circuit of setting value and carry out 1/4 cycle phase compare again, if the phase place of certain circuit zero-sequence current is different from other circuit, then it is faulty line, if all zero-sequence current same-phases, it is then busbar fault, adopt the current transformer that there is Weak current and detect, primary current just enters linear transformation at tens milliamperes, big current speed per hour is saturated, exciting current is faint, secondary can export milliampere level, ensure to gather the accurate of electric current.
9. a power distribution network cascade switching station intelligent management system, comprise at least two switching stations, it is characterized in that: between all described switching stations, be configured with optical fiber ring network, switching station described in each is provided with troubleshooting terminal, described in each, troubleshooting terminal is all connected with described optical fiber ring network by Ethernet switch, described in each, troubleshooting terminal is provided with communication server, and all described communication servers are all connected with distribution main website.
10. power distribution network cascade switching station intelligent management system according to claim 9, is characterized in that: described troubleshooting terminal is arranged in the rack in described switching station or switchgear house; Described communication server comprises OLT device, ONU equipment and optical splitter; Described OLT device adopts many PON jaws equipment, and described ONU equipment selects connecting port on double-PON port, and second line of a couplet automatization terminal adopts network interface.
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Effective date of registration: 20220826 Address after: 100033 West Chang'an Avenue, Xicheng District, Xicheng District, Beijing Patentee after: State Grid Corporation of China Patentee after: STATE GRID HENAN ELECTRIC POWER COMPANY ZHENGZHOU POWER SUPPLY Co. Patentee after: ZHENGZHOU XIANGHE GROUP Co.,Ltd. Patentee after: ZHENGZHOU HAIPAI ELECTRICAL TECHNOLOGY Co.,Ltd. Address before: 100033 West Chang'an Avenue, Xicheng District, Xicheng District, Beijing Patentee before: State Grid Corporation of China Patentee before: STATE GRID HENAN ELECTRIC POWER COMPANY ZHENGZHOU POWER SUPPLY Co. Patentee before: ZHENGZHOU HUALI INFORMATION TECHNOLOGY Co.,Ltd. Patentee before: ZHENGZHOU HAIPAI ELECTRICAL TECHNOLOGY Co.,Ltd. |