CN105391038A - Area protection based intelligent terminal in power network and control method for intelligent terminal - Google Patents
Area protection based intelligent terminal in power network and control method for intelligent terminal Download PDFInfo
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- CN105391038A CN105391038A CN201510908219.6A CN201510908219A CN105391038A CN 105391038 A CN105391038 A CN 105391038A CN 201510908219 A CN201510908219 A CN 201510908219A CN 105391038 A CN105391038 A CN 105391038A
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Abstract
The invention provides an area protection based intelligent terminal in a power network. The intelligent terminal comprises a main controller formed by an ARM main chip, a corresponding peripheral circuit of the ARM main chip, as well as a data communication unit, a power supply unit and a remote-control and remote-signaling unit that are all connected with the main controller, wherein the data communication unit is further connected with each combining unit in the power network; the remote-control and remote-signaling unit is further connected with each linkage switch in the power network, and the remote-control and remote-signaling unit comprises a remote-control module and a remote-signaling module; the remote-control module is provided with a three-level electronic lock watchdog and a locking anti-tripping loop for eliminating fatal damage on an apparatus due to switch rejecting act; and the remote-signaling module is provided with a filter circuit for preventing signal interference and a photoelectric isolation circuit. The area protection based intelligent terminal can be applicable to various network frame structures and different system running modes; and the intelligent terminal is multifunctional, and capable of rapidly realizing fault removal, isolation and load transfer, reducing network reconstruction time and improving operational safety and reliability of an intelligent power network.
Description
Technical field
The present invention relates to electric network fault processing technology field, particularly relate in a kind of electric power networks based on the intelligent terminal of locality protection and control method thereof.
Background technology
Power distribution automation is the important component part of intelligent grid; its core is distribution network failure process; for raising power supply reliability; expanding power supply capacity runs significant with the high-efficiency and economic realizing electrical network; therefore in order to better realize power distribution automation target; create a kind of novel Preservation tactics, i.e. locality protection.Locality protection have employed a kind of brand-new distributed protection and coordinates thinking, and ensure nearest from fault point circuit breaker quick-break tripping operation, other switch enters standby, does not trip, and makes that fault outage scope is minimum, fault outage shortest time.Meanwhile, primary equipment is intelligent on the spot, only needs near primary equipment installation site, to install merge cells additional the access of relevant signal, the signal of primary equipment access is converted to digital signal and is sent by optical fiber.Greatly reduce the laying of cable in intelligent grid process of construction, save material, improve the anti-interference of signal transmission.
At present, power distribution network intelligent protection comprises centralized intelligence protection and distributed intelligence protects two kinds of patterns, specific as follows:
(1) centralized intelligence protected mode: all data of power distribution network are all processed by the main website as control centre; when breaking down on the line; fault message is delivered to main website by communication port by on-the-spot Feeder Terminal Unit; main website is according on off state, fault detection information, Network topology; failure judgement section, issues guidance command, performs a series of automatic operation; reconstructed network, with isolated fault and the power supply recovering non-faulting section.
The advantage of this protected mode is: can precise control; be applicable to various complication system; and Financial cost is relatively low; but shortcoming is: the computer soft and hardware system needing reliable communication channel and control centre, and can only be applicable on the transmission line in the less demanding region of power supply reliability.
(2) distributed intelligence protected mode: all data processings of power distribution network all can be completed in locality according to the program be preset on its microprocessor by intelligent terminal unit; intervene without the need to the main website as control centre; after troubleshooting completes; to report to the police and switch contact state feedback to control centre, thus realize distributed intelligence.
The advantage of this protected mode is: be no longer dependent on main website to process on-the-spot each fault occurred on the one hand, even if communicating interrupt, the speed that also can not affect troubleshooting and the time restored electricity, the speed of fault automatic location and network reconfiguration can be significantly increased on the other hand, but shortcoming is: due to existing intelligent terminal function singleness, when the position of distributed power source access power distribution network is not fixed, make the protection seting value on intelligent terminal and strategy and be difficult to effective coordination between distributed power source randomness and mate, thus there is serious mistake in causing trouble isolation and load transfer operation.
Therefore, need a kind of intelligent terminal badly, be applicable to various grid structure and different system operation modes, there is several functions, can mate with effective coordination between distributed power source randomness, realize failure removal, isolation and load transfer fast, reduce the network reconfiguration time, improve the safety and reliability that intelligent grid runs.
Summary of the invention
Embodiment of the present invention technical problem to be solved is; there is provided in a kind of electric power networks based on the intelligent terminal of locality protection and control method thereof; be applicable to various grid structure and different system operation modes; there is several functions; can mate with effective coordination between distributed power source randomness; realize failure removal, isolation and load transfer fast, reduce the network reconfiguration time, improve the safety and reliability that intelligent grid runs.
In order to solve the problems of the technologies described above; embodiments provide the intelligent terminal based on locality protection in a kind of electric power networks; it matches to multiple connection switch and multiple merge cells for gathering corresponding connection switching voltage or current information; described intelligent terminal comprises the master controller formed by ARM master chip and corresponding peripheral circuit thereof; and data communication units, power supply unit and the remote control remote communication unit to be all connected with described master controller: wherein
Described data communication units is also all connected with each merge cells in described electric power networks;
Also with described electric power networks each connects switch and is all connected described remote control remote communication unit, and it comprises the remote control module that exports for signal and the remote signal module for signal input; Wherein, described remote control module is provided with three grades of electronic lock house dogs and locking anti-jump loop to remove the fatal damages because switch failure causes device; Described remote signal module is provided with filter circuit and photoelectric isolating circuit for preventing signal disturbing.
Wherein, described data communication units comprises wire communication module and wireless communication module; Wherein, described wireless communication module to comprise among the sub-communication module of GPRS, Zigbee communication submodule, WIFI communicator module and Bluetooth communication submodule its one or more; Described wire communication module to comprise among 10/100BASE-T self adaptation Ethernet submodule, RS-485 interface sub-module, RS-232 interface submodule, optical fiber interface submodule its one or more.
Wherein, described power supply unit provides two-way power supply AC220V or DC200V to input.
The embodiment of the present invention additionally provides the control method based on the intelligent terminal of locality protection in a kind of electric power networks, and it realizes comprising on aforesaid intelligent terminal, and described control method comprises:
Intelligent terminal determines the current grid structure of electric power networks and the current type of each connection switch contained thereof; Wherein, described grid structure supports the network configuration that among many power supplys, open loop, closed loop, one is formed; The type of described connection switch be among circuit breaker, on-load switch its one or more;
The voltage that in electric power networks described in Real-time Obtaining, each merge cells sends or current information, and according to the described real-time voltage that gets or current information, detect the connection switch of the merge cells that moment of fault current is corresponding and correspondence thereof;
The described merge cells that detects and voltage corresponding to adjacent analysis units thereof or current information are carried out analyzing and processing, and according to result, and the current type of current grid structure and each connection switch, control the corresponding switch that connects and close a floodgate or separating brake, realize Fault Isolation.
Wherein, described control method comprises further:
When the current grid structure of described electric power networks is open loop mode, after described intelligent terminal realizes Fault Isolation, transmit button position signalling, makes the interconnection switch in described electric power networks close a floodgate rapidly and can not be incorporated in fault.
Wherein, described control method comprises further:
Described intelligent terminal has load monitoring function, according to control to connect switch fault preload situation, and the on-load ability that interconnection switch self is adjusted, judges whether to close a floodgate, and there will not be overload after guaranteeing to close a floodgate.
Implement the embodiment of the present invention, compared with prior art there is following beneficial effect:
1) primary equipment is intelligent on the spot, greatly reduces the laying of cable in intelligent grid process of construction, saves material, improves the anti-interference of signal transmission;
2) reliability and stability of traditional primary equipment improve the safety and reliability that intelligent grid runs.
3) locality protection strategy is adopted: troubleshooting is by force ageing; Logical algorithm is simple and reliable, calculate and transinformation content less, process is fast; Disobey rascal station; Backup protection is provided; Turn for optimizing: Fault Isolation adopts cascaded communication, and interconnection switch closes a floodgate after receiving this signal at once; Ensure that interconnection switch closes a floodgate rapidly and can not be incorporated in fault.Intelligent terminal has load monitoring function, and interconnection switch turns when supplying will consider its own band loading capability, there will not be overload after guaranteeing combined floodgate.The electric power networks of electric pressure at different levels can easily be applicable to, and need not the syndeton of worry about network and the operational mode of system.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, the accompanying drawing obtaining other according to these accompanying drawings still belongs to category of the present invention.
Based on the system block diagram of the intelligent terminal of locality protection in the electric power networks that Fig. 1 provides for the embodiment of the present invention;
Based on the connection diagram of power distribution network in the intelligent terminal of locality protection in the electric power networks that Fig. 2 provides for the embodiment of the present invention;
Based on a structural representation of control switch operation principle in the intelligent terminal of locality protection in the electric power networks that Fig. 3 provides for the embodiment of the present invention;
Based on another structural representation of control switch operation principle in the intelligent terminal of locality protection in the electric power networks that Fig. 4 provides for the embodiment of the present invention;
Based on the another structural representation of control switch operation principle in the intelligent terminal of locality protection in the electric power networks that Fig. 5 provides for the embodiment of the present invention;
Based on an application scenarios figure of the intelligent terminal of locality protection in the electric power networks that Fig. 6 provides for the embodiment of the present invention;
Based on the Another Application scene graph of the intelligent terminal of locality protection in the electric power networks that Fig. 7 provides for the embodiment of the present invention;
Based on the another application scenarios figure of the intelligent terminal of locality protection in the electric power networks that Fig. 8 provides for the embodiment of the present invention;
Based on the another application scenarios figure of the intelligent terminal of locality protection in the electric power networks that Fig. 9 provides for the embodiment of the present invention;
Based on the another application scenarios figure of the intelligent terminal of locality protection in the electric power networks that Figure 10 provides for the embodiment of the present invention;
Based on the flow chart of the control method of the intelligent terminal of locality protection in the electric power networks that Figure 11 provides for the embodiment of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail.
As shown in Figure 1, in the embodiment of the present invention, based on the intelligent terminal of locality protection in a kind of electric power networks provided, it matches to multiple connection switch and multiple merge cells for gathering corresponding connection switching voltage or current information.Described electric power networks comprises Bulk Supply Substation ES1, from transformer station ES2 and be serially connected with Bulk Supply Substation ES1 and from the multiple distributed unit T circuit between transformer station ES2, and each distributed unit T includes the connection switch S be serially connected with on circuit and the merge cells P(be connected on circuit as shown in Figure 2);
Intelligent terminal M comprises the master controller 1 formed by ARM master chip and corresponding peripheral circuit thereof, and the data communication units 2, power supply unit 3 and the remote control remote communication unit 4 that are all connected with master controller 1: wherein,
Data communication units 2 is also all connected with each merge cells P in electric power networks;
Also with electric power networks each connects switch S and is all connected remote control remote communication unit 4, and it comprises the remote control module that exports for signal and the remote signal module for signal input; Wherein, remote control module is provided with three grades of electronic lock house dogs and locking anti-jump loop to remove the fatal damages because switch failure causes device; Remote signal module is provided with filter circuit and photoelectric isolating circuit for preventing signal disturbing.
Should be noted that, three grades of electronic lock house dogs on remote control module, adopt independently power supply, and guarantee the high reliability of remote control, high noise immunity, this output adopts the control procedure of preset-anti-school-execution, provides relay normally open contact to export, and locking anti-jump loop can remove the fatal damages caused intelligent terminal M because connecting switch failure.
In embodiments of the present invention, when intelligent terminal M judges that the relevant information that a certain merge cells P sends meets pre-conditioned, determine fault current and fault point, and control the corresponding controlled connection switch motion in fault point by remote control remote communication unit 4, thus the power supply of realization control access fault point and power distribution network are separated, and reach the object that transfer is automatically powered.Therefore, have and automatically realize fault location, reduce the several functions such as protection act number of times, and the speed of network reconfiguration can be improved, reduce the network reconfiguration time.
Be understandable that, after above-mentioned access power supply and power distribution network are separated, then intelligent terminal M meeting transmit button position signalling is to the interconnection switch action in electric power networks, makes interconnection switch action rapid closing, then can guarantee accurately to close a floodgate to power supply trouble place.
Further, data communication units 2 comprises wire communication module and wireless communication module; Wherein, wireless communication module to comprise among the sub-communication module of GPRS, Zigbee communication submodule, WIFI communicator module and Bluetooth communication submodule its one or more; Wire communication module to comprise among 10/100BASE-T self adaptation Ethernet submodule, RS-485 interface sub-module, RS-232 interface submodule, optical fiber interface submodule its one or more.Therefore wire communication module can be supported the protocol communications such as RS485, RS232, support the data communication such as Ethernet interface, optical fiber, and supports IEC608-70-5-101, IEC60870-5-104(balanced type, unbalanced) or 61850 the multiple communication protocol such as goose agreement.
Further, power supply unit 3 provides two-way power supply AC220V or DC200V to input.There is the seamless power switching function of duplicate supply, guarantee that intelligent terminal M can normally work, and there is Intelligent management of power function, battery low pressure, the function such as warning function and stand-by power supply automatic switching such as to overcharge.
In embodiments of the present invention; the grid structure of electric power networks can support the network configuration that among many power supplys, open loop, closed loop, one is formed; connect the type of switch be among circuit breaker, on-load switch its one or more; namely intelligent terminal M can support the Preservation tactics of full circuit breaker, full load switch and circuit breaker and on-load switch mixed networking; and for the insecure situation of switch motion mechanism performance; devise a set of perfect fault-tolerant networks, guarantee effective isolated fault and restore electricity.
In the embodiment of the present invention in electric power networks based on the operation principle of the intelligent terminal of locality protection be: obtain the signal of (as passed through ethernet link) each merge cells P by data communication units 2 and be decoded into data, connect switch S by remote control remote communication unit 4 from each simultaneously and obtain input signal, after comprehensive descision being carried out to the above-mentioned data that get and signal in master controller 1, send data to data communication units 2 or export control command to remote control remote communication unit 4; After pending data communication unit 2 receives the data of master controller 1, encode according to protocol frame radical, then feed back to background data center; After the control command certificate that remote control remote communication unit 4 receives master controller 1, output function instruction controls the corresponding switch S that connects and closes a floodgate or separating brake.
In embodiments of the present invention; as shown in Figures 3 to 5, what intelligent terminal M had in following function is whole or several: fast tripping protection function, overcurrent protection function, electric coincidence function, successful reclosing latch-up protection function in short-term, be incorporated into quick tripping function, on-load switch Fault Isolation function, interlocking dead electricity time delay separating brake blocking function, dead electricity time delay separating brake not blocking function, residual voltage pulse separating brake blocking function, one-sided decompression time-delay closing function etc. after fault.Wherein, the function concrete meaning of intelligent terminal M is:
Open loop mode:
1) network type fast tripping protection function: self overcurrent and exceed quick-break definite value, the left and right sides only has side overcurrent, without " latch-up protection " mark-> switch automatic brake separating;
2) fast tripping protection backup protection function: self overcurrent and exceed quick-break definite value, the equal overcurrent in the left and right sides, without " latch-up protection " mark-> fault current sustainable existence--> standby time delay is to rear switch automatic brake separating;
3) network type overcurrent protection function: self overcurrent and exceed overcurrent definite value but be less than quick-break definite value, the left and right sides only has side overcurrent, without " latch-up protection " mark-> delay time to-> switch automatic brake separating;
4) overcurrent protection emergency function: self overcurrent and exceed overcurrent definite value but be less than quick-break definite value, without " latch-up protection " mark-> overcurrent delay time, the equal overcurrent in the left and right sides, adds that standby delay time is to rear-> switch automatic brake separating;
Closed loop mode:
1) network type fast tripping protection function: self overcurrent and be greater than quick-break definite value, cross flow path direction to the right and right-side switch without combined fault outflow of bus current (or self overcurrent, cross flow path direction left and left-side switch without combined fault outflow of bus current), without " latch-up protection " mark-> switch automatic brake separating;
2) fast tripping protection backup protection function: self overcurrent and be greater than quick-break definite value, cross flow path direction and right-side switch has combined fault outflow of bus current (or self overcurrent to the right, cross flow path direction left and left-side switch has combined fault outflow of bus current), without " latch-up protection " mark-> fault current sustainable existence--> standby time delay is to rear switch automatic brake separating;
3) network type overcurrent protection function: self overcurrent and electric current are greater than protection definite value in limited time and are less than quick-break definite value, cross flow path direction to the right and right-side switch without combined fault outflow of bus current (or self overcurrent, cross flow path direction left and left-side switch without combined fault outflow of bus current), without " latch-up protection " mark-> delay time to-> switch automatic brake separating;
4) overcurrent protection emergency function: self overcurrent and electric current is greater than overcurrent protection definite value is less than quick-break definite value, cross flow path direction and right-side switch has combined fault outflow of bus current (or self overcurrent to the right, cross flow path direction left and left-side switch has combined fault outflow of bus current), add that standby delay time is to rear-> switch automatic brake separating without " latch-up protection " mark-> overcurrent delay time;
General utility functions:
5) interlocking dead electricity time delay separating brake blocking function: self decompression defluidization; receive adjacent switch " protection fault trip " (or " on-load switch fault trip ") mark-> delay time to-> switch automatic brake separating and locking, put " separating brake locking " flag bit.
6) dead electricity time delay separating brake not blocking function: for being close to the switch of power supply.Self decompression defluidization-> delay time is to-> switch automatic brake separating not locking.
7) residual voltage pulse separating brake blocking function: switch divides position, detects that residual voltage pulse-> " separating brake not locking " mark is converted to " separating brake locking " mark.
8) one-sided decompression time-delay closing function: there is pressure switch point position-> switch side, without " locking turns confession " mark, adjacent switch fault-free trip mark, receives " Fault Isolation successfully " signal, " its own band loading capability is strong "-> delay time to-> switch automatic closing.
9) electric coincidence function: there is pressure switch side--> switch not at co-bit-> without " locking obtains electric coincidence " mark, without " residual voltage pulse "-> delay time to-> switch automatic closing.
10) successful reclosing latch-up protection function in short-term: " electric coincidence " successful reclosing-> " latch-up protection mark " set, the electric current that breaks down (fault current duration is greater than protection time delay, is less than protection time delay+latch-up protection time delay in short-term)--> protection is failure to actuate-and > delay time is to-> " latch-up protection mark " removing.
11) be incorporated into quick tripping function after fault: after switch co-bit-> " electric coincidence " overlaps, detect that overcurrent-> sets delay time to-> switch automatic brake separating.
12) on-load switch Fault Isolation function: switch co-bit-> " down pulse " flag set--> communicates with adjacent switch, > " separating brake locking " flag set that there is overcurrent opposite side adjacent switch side without overcurrent--> self decompression defluidization-> switch automatic brake separating locking--.
13) switch failure: switch " point position " signal do not detected or overcurrent detected between " separating brake " signal (trip protection or isolation separating brake)-> time delay--> " switch failure " flag set.
In one embodiment, as shown in Figure 6, network configuration reduced graph when electric power networks is open loop mode, and when combination is broken down as Fig. 6 illustrates, the protection act process of intelligent terminal M:
In Fig. 6, S1, S2, S3, S4 are circuit breaker entirely; For closing a floodgate when S1, S2, S3 system is normally run; S4 is interconnection switch, is separating brake when system is normally run; An intelligent terminal M, controls 4 circuit breakers, collects voltage or current information by merge cells; ES1 is Bulk Supply Substation, and ES2 is from transformer station; Transformer station wire-outgoing breaker CB1, CB2 adjust No. 1 reclosing function.
1, when fault point F1 is between ES1 and the S1 of station, now protection act process is: after (1) CB1 experiences fault current, fast tripping protection or overcurrent protection action; (2) CB1 reclosing action; (3) after CB1 is incorporated into fault, fast trip; (4) intelligent terminal starts " the not locking of dead electricity time delay separating brake " function and " locking of residual voltage pulse separating brake " function; Order S1 separating brake; (5) intelligent terminal starts " one-sided decompression time-delay closing " function, receives the switch position signal of S1 feedback simultaneously; Meanwhile, according to the fault preload situation of S1, and the on-load ability that S4 self adjusts, judge whether to close a floodgate.
But when F1 fault, during S1 tripping, protection act process is: after (1) CB1 experiences fault current, fast tripping protection or overcurrent protection action; (2) CB1 reclosing action; (3) after CB1 is incorporated into fault, fast trip; (4) intelligent terminal starts " the not locking of dead electricity time delay separating brake " function and " locking of residual voltage pulse separating brake " function, order S1 separating brake; But because machinery is abnormal, switch S 1 tripping; (5) " locking of interlocking dead electricity time delay separating brake " function after intelligent terminal receives the switch failure signal of S1, is started; Order S2 separating brake; (6) intelligent terminal starts " one-sided decompression time-delay closing " function, receives the switch position signal of S2 feedback simultaneously; Meanwhile, according to the fault preload situation of S2, and the on-load ability that S4 self adjusts, judge whether to close a floodgate.
2, fault point F2 is between switch S 1 and S2, and now protection act process is: (1) intelligent terminal starts " fast tripping protection " function or " overcurrent protection " function; Order S1 tripping operation; (2) intelligent terminal starts " locking of interlocking dead electricity time delay separating brake " function; Order S2 separating brake; (3) intelligent terminal starts " one-sided decompression time-delay closing " function, receives the switch position signal of S2 feedback simultaneously; Meanwhile, according to the fault preload situation of S2, and the on-load ability that S4 self adjusts, judge whether to close a floodgate.
In another embodiment, as shown in Figure 7, network configuration reduced graph when electric power networks is closed loop mode, and when combination is broken down as Fig. 7 illustrates, the protection act process of intelligent terminal M:
In Fig. 7, S1, S2, S3, S4 are circuit breaker entirely; For closing a floodgate when S1, S2, S3, S4 system is normally run; An intelligent terminal M, controls 4 circuit breakers, collects voltage or current information by merge cells; ES1 is Bulk Supply Substation, and ES2 is from transformer station; Transformer station wire-outgoing breaker CB1, CB2 adjust No. 1 reclosing function.
Fault point F3 is between switch S 2 and S3, and switch S 2 and the equal tripping of S3, now protection act process is: (1) intelligent terminal starts " fast tripping protection " function or " overcurrent protection " function; Order S2 tripping operation; But because machinery is abnormal, switch S 2 tripping; (2) after intelligent terminal receives the switch failure signal of S2, " fast tripping protection " function or " overcurrent protection " function is started, order S1 tripping operation; (3) intelligent terminal starts " fast tripping protection " function or " overcurrent protection " function; Order S3 tripping operation; But because machinery is abnormal, switch S 3 tripping; (4) after intelligent terminal receives the switch failure signal of S3, " fast tripping protection " function or " overcurrent protection " function is started, order S4 tripping operation.
In yet another embodiment, as shown in Figure 8, network configuration reduced graph when electric power networks is closed loop mode, and when combination is broken down as Fig. 8 illustrates, the protection act process of intelligent terminal M:
In Fig. 8, S1, S2, S3, S4 are circuit breaker entirely; For closing a floodgate when S1, S2, S3, S4 system is normally run; An intelligent terminal M, controls 4 circuit breakers, collects voltage or current information by merge cells; ES1 is Bulk Supply Substation, and ES2 is from transformer station; Transformer station wire-outgoing breaker CB1, CB2 adjust No. 1 reclosing function.
Fault point F4 is between switch S 2 and S3, after pending fault point F4 isolates, occur again the fault point F5 between switch S 1 and S2, now protection act process is: during (a) F4 fault: (1) intelligent terminal starts " fast tripping protection " function or " overcurrent protection " function; Order S2 tripping operation; (2) intelligent terminal starts " fast tripping protection " function or " overcurrent protection " function; Order S3 tripping operation.During (b) F5 fault: (1) intelligent terminal starts " fast tripping protection " function or " overcurrent protection " function; Order S1 tripping operation.
In yet another embodiment, as shown in Figure 9, network configuration reduced graph when electric power networks is closed loop mode, and when combination is broken down as Fig. 9 illustrates, the protection act process of intelligent terminal M:
In Fig. 9, S1, S4 are circuit breaker, and K2, K3 are on-load switch; For closing a floodgate when S1, K2, K3, S4 system is normally run; An intelligent terminal M, controls circuit breaker and on-load switch, collects voltage or current information by merge cells; ES1 is Bulk Supply Substation, and ES2 is from transformer station; Transformer station wire-outgoing breaker CB1, CB2 adjust No. 1 reclosing function.
Fault point F6 is between K switch 2 and K3, and now protection act process is: (1) intelligent terminal starts " fast tripping protection " function or " overcurrent protection " function; Order S1, S4 tripping operation; (2) intelligent terminal starts " fault current pulse detection " function and " on-load switch Fault Isolation " function; Order K2 separating brake; But because machinery is abnormal, K switch 2 tripping; (3) intelligent terminal starts " fault current pulse detection " function and " on-load switch Fault Isolation " function; Order K3 separating brake; (4), after intelligent terminal receives the switch failure signal of K2, order S1 keeps gate-dividing state; (5) intelligent terminal starts " obtaining electric coincidence " function; " successful reclosing is latch-up protection in short-term " function; Order S4 closes a floodgate.
In yet another embodiment, as shown in Figure 10, network configuration reduced graph when electric power networks is open loop mode, and when combination is broken down as Figure 10 illustrates, the protection act process of intelligent terminal M:
In Figure 10, S1, S3 are circuit breaker, and K2, K4 are on-load switch; For closing a floodgate when S1, K2, S3, K4 system is normally run; An intelligent terminal M, controls circuit breaker and on-load switch, collects voltage or current information by merge cells; ES1 is Bulk Supply Substation, and ES2 is from transformer station; Transformer station wire-outgoing breaker CB1, CB2 adjust No. 1 reclosing function.
Fault point F7 is between K switch 2 and S3, and K2 tripping, now protection act process is: (1) intelligent terminal starts " fast tripping protection " function or " overcurrent protection " function, order S1 tripping operation; (2) intelligent terminal starts " fault current pulse detection " function and " on-load switch Fault Isolation " function; Order K2 separating brake; But because machinery is abnormal, K switch 2 tripping; (3), after intelligent terminal receives the switch failure signal of K2, order S1 keeps separating brake; (4) intelligent terminal starts " locking of interlocking dead electricity time delay separating brake " function, order S3 separating brake; (5) intelligent terminal starts " one-sided decompression time-delay closing " function, receives the switch position signal of S3 feedback simultaneously; Meanwhile, according to the fault preload situation of S3, and the on-load ability that K4 self adjusts, judge whether to close a floodgate.
As shown in figure 11, in the embodiment of the present invention, based on the control method of the intelligent terminal of locality protection in a kind of electric power networks provided, it realizes comprising on aforesaid intelligent terminal, and described control method comprises:
Step S1, intelligent terminal determine the current grid structure of electric power networks and the current type of each connection switch contained thereof; Wherein, described grid structure supports the network configuration that among many power supplys, open loop, closed loop, one is formed; The type of described connection switch be among circuit breaker, on-load switch its one or more;
The voltage that in electric power networks described in step S2, Real-time Obtaining, each merge cells sends or current information, and according to the described real-time voltage that gets or current information, detect the connection switch of the merge cells that moment of fault current is corresponding and correspondence thereof;
Step S3, the described merge cells that detects and voltage corresponding to adjacent analysis units thereof or current information are carried out analyzing and processing, and according to result, and the current type of current grid structure and each connection switch, control the corresponding switch that connects and close a floodgate or separating brake, realize Fault Isolation.
Wherein, described control method comprises further:
When the current grid structure of described electric power networks is open loop mode, after described intelligent terminal realizes Fault Isolation, transmit button position signalling, makes the interconnection switch in described electric power networks close a floodgate rapidly and can not be incorporated in fault.
Wherein, described control method comprises further:
Described intelligent terminal has load monitoring function, according to control to connect switch fault preload situation, and the on-load ability that interconnection switch self is adjusted, judges whether to close a floodgate, and there will not be overload after guaranteeing to close a floodgate.
Implement the embodiment of the present invention, compared with prior art there is following beneficial effect:
1) primary equipment is intelligent on the spot, greatly reduces the laying of cable in intelligent grid process of construction, saves material, improves the anti-interference of signal transmission;
2) reliability and stability of traditional primary equipment improve the safety and reliability that intelligent grid runs.
3) locality protection strategy is adopted: troubleshooting is by force ageing; Logical algorithm is simple and reliable, calculate and transinformation content less, process is fast; Disobey rascal station; Backup protection is provided; Turn for optimizing: Fault Isolation adopts cascaded communication, and interconnection switch closes a floodgate after receiving this signal at once; Ensure that interconnection switch closes a floodgate rapidly and can not be incorporated in fault.Intelligent terminal has load monitoring function, and interconnection switch turns when supplying will consider its own band loading capability, there will not be overload after guaranteeing combined floodgate.The electric power networks of electric pressure at different levels can easily be applicable to, and need not the syndeton of worry about network and the operational mode of system.
One of ordinary skill in the art will appreciate that all or part of step realized in above-described embodiment method is that the hardware that can carry out instruction relevant by program has come, described program can be stored in a computer read/write memory medium neutralization and be written on the microprocessor of intelligent terminal, described storage medium, as ROM/RAM, disk, CD etc., described microprocessor, as ARM, PowerPC etc.
Above disclosedly be only present pre-ferred embodiments, certainly can not limit the interest field of the present invention with this, therefore according to the equivalent variations that the claims in the present invention are done, still belong to the scope that the present invention is contained.
Claims (6)
1. in an electric power networks based on the intelligent terminal of locality protection; it matches to multiple connection switch and multiple merge cells for gathering corresponding connection switching voltage or current information; it is characterized in that; described intelligent terminal comprises the master controller (1) formed by ARM master chip and corresponding peripheral circuit thereof; and data communication units (2), power supply unit (3) and the remote control remote communication unit (4) to be all connected with described master controller (1): wherein
Described data communication units (2) is also all connected with each merge cells in described electric power networks;
Also with described electric power networks each connects switch and is all connected described remote control remote communication unit (4), and it comprises the remote control module that exports for signal and the remote signal module for signal input; Wherein, described remote control module is provided with three grades of electronic lock house dogs and locking anti-jump loop to remove the fatal damages because switch failure causes device; Described remote signal module is provided with filter circuit and photoelectric isolating circuit for preventing signal disturbing.
2. intelligent terminal as described in claim 1, it is characterized in that, described data communication units (2) comprises wire communication module and wireless communication module; Wherein, described wireless communication module to comprise among the sub-communication module of GPRS, Zigbee communication submodule, WIFI communicator module and Bluetooth communication submodule its one or more; Described wire communication module to comprise among 10/100BASE-T self adaptation Ethernet submodule, RS-485 interface sub-module, RS-232 interface submodule, optical fiber interface submodule its one or more.
3. intelligent terminal as described in claim 2, it is characterized in that, described power supply unit (3) provides two-way power supply AC220V or DC200V to input.
4. in electric power networks based on a control method for the intelligent terminal of locality protection, it is characterized in that, it realizes comprising on intelligent terminal as claimed any one in claims 1 to 3, and described control method comprises:
Intelligent terminal determines the current grid structure of electric power networks and the current type of each connection switch contained thereof; Wherein, described grid structure supports the network configuration that among many power supplys, open loop, closed loop, one is formed; The type of described connection switch be among circuit breaker, on-load switch its one or more;
The voltage that in electric power networks described in Real-time Obtaining, each merge cells sends or current information, and according to the described real-time voltage that gets or current information, detect the connection switch of the merge cells that moment of fault current is corresponding and correspondence thereof;
The described merge cells that detects and voltage corresponding to adjacent analysis units thereof or current information are carried out analyzing and processing, and according to result, and the current type of current grid structure and each connection switch, control the corresponding switch that connects and close a floodgate or separating brake, realize Fault Isolation.
5. control method as described in claim 4, it is characterized in that, described control method comprises further:
When the current grid structure of described electric power networks is open loop mode, after described intelligent terminal realizes Fault Isolation, transmit button position signalling, makes the interconnection switch in described electric power networks close a floodgate rapidly and can not be incorporated in fault.
6. control method as described in claim 5, it is characterized in that, described control method comprises further:
Described intelligent terminal has load monitoring function, according to control to connect switch fault preload situation, and the on-load ability that interconnection switch self is adjusted, judges whether to close a floodgate, and there will not be overload after guaranteeing to close a floodgate.
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