CN102957134A - System and method for rapidly isolating short trouble and recovering power supply in power grid - Google Patents
System and method for rapidly isolating short trouble and recovering power supply in power grid Download PDFInfo
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- CN102957134A CN102957134A CN2012103233593A CN201210323359A CN102957134A CN 102957134 A CN102957134 A CN 102957134A CN 2012103233593 A CN2012103233593 A CN 2012103233593A CN 201210323359 A CN201210323359 A CN 201210323359A CN 102957134 A CN102957134 A CN 102957134A
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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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Abstract
The invention relates to a system and a method for rapidly isolating a short trouble and recovering power supply in a power grid. The system comprises a plurality of terminal lower computers and a control center server upper computer, wherein the terminal lower computers are arranged beside a switch in the power grid, are used for monitoring working current of the switch and are responsible for controlling the switching-on/off of the switch; a control center server upper computer interface is provided with a net according to an actual switch position relation; the control center server upper computer can send out a real-time current inquiring and switch control command to a terminal to receive real-time current information and a large-current alarming signal from respective terminal; and a short trouble point can be rapidly isolated to do power supply scheduling to recover the power supply of a normal region. According to the system for rapidly isolating the short trouble and recovering the power supply in the power grid, the position of the short trouble point can be rapidly found out to cut off power distribution switches at the two ends to isolate the short trouble point; and the power supply scheduling is automatically realized so as to guarantee power utilization requirements of a normal region except a short-circuit point.
Description
Technical field
The present invention relates to the intelligent grid field, be specifically related to the quick isolation of short trouble and service restoration system and method thereof in a kind of electrical network.
Background technology
In recent years, country invests intelligent grid energetically, and power industry develops rapidly.Rely on present information, communication and control technology, intellectuality, a networked modern power network are progressively built up.
The circuit of present unrealized feeder automation, mainly be in 10kV circuit or tree-shaped circuit, to adopt the mode of automatic circuit, sectionalizer to realize, because this kind mode need not collocation channel and main station system, rely on the function of automatic circuit and sectionalizer self to carry out Fault Isolation and restore electricity, thus possess easy enforcement, the advantage such as reduce investment outlay.But this mode causes the large tracts of land dead electricity easily, and before investigating out the line short fault point and it is repaired, whole supply network all will be in outage state of paralysis, effect.
Summary of the invention
For above-mentioned deficiency, the present invention proposes the quick isolation of short trouble and service restoration system and method thereof in a kind of electrical network, can find out fast the short circuit trouble point position, cut off the panel switches at its two ends with the isolation short circuit trouble point, and automatically realize power supply dispatching, to ensure the need for electricity of normal region except short dot.
For achieving the above object, the technical solution adopted in the present invention is:
Short trouble is isolated and service restoration system and method thereof fast in a kind of electrical network, comprising:
1) some terminal slave computers: the terminal slave computer is arranged at by the switch in the electrical network, is used for the operating current of this switch of monitoring, and be responsible for this switch of control deciliter.Each terminal mainly is comprised of master controller, network communication module, sampling module, memory module and relay.Master controller has comprised the 10/100Mbps ethernet mac, only need add PHY layer network communication module chip and with the network port of network transformer, can realize and control centre's PC between communication.For reliability and the speed that improves communication, the signal of telecommunication that the network port is exported converts light signal to, uses optical fiber as communication media.The fibre core of monomode fiber is corresponding thinner, and the range loss of single mode signal is less than multimode, and transmission frequency bandwidth, capacity are large, long transmission distance.Spendable optical-electrical converter is selected the monomode fiber transceiver.Storage server IP, each terminal IP and Short-Circuit High Current threshold value in the memory module.Relay be used for subscriber switch that each terminal of control connects deciliter.
2) control centre's server host computer: client is connected with database by Web server in the real time information management system of server Network Based, local area network (LAN), realizes the real-time, interactive of data.Operating system adopts Windows 2000Server, and programming language is Java language, selects the dynamic interaction function between JSP technology realization Web system and user.Adopt SQL Server 2000 databases, take sql like language as the database operating instruction language.Position of the switch relation according to reality on the host computer interface is arranged net.Host computer can send real-time current inquiry, switch control command to terminal, reception is from real-time current information and the large electric current alarm signal of each terminal, according to large electric current alarm signal, in 80ms, isolate short circuit trouble point, and make power supply dispatching to recover the power supply of normal region.
Fast isolation and service restoration method of short trouble adopts similar traversal of tree in a kind of electrical network, in the mode of recursive lookup the switch in the whole electrical network traveled through, and finds and isolates short circuit trouble point and carry out corresponding power supply dispatching, and specific algorithm is as follows:
1) initialization when preceding switch be the root node switch;
2) 〉=2 whether current switch branch number? be then to jump to step 6, otherwise jump to step 3;
3)=1 whether current switch branch number? be then to jump to step 4, otherwise short trouble be described not in the branch when the preceding switch place, end is searched by current branch;
4) when the electric current warning mark position of preceding switch and branch switch thereof whether identical? the identical step 5 that then jumps to, difference then jumps to step 8;
5) be its branch switch with current switch update, get back to step 2 and continue to search short circuit trouble point;
Are 6) be 1 when whether preceding switch and all branches thereof have and only have the fault flag of a switch, all the other 0? being then to jump to step 8, is not then to jump to step 7;
7) branch switch that successively will be identical with current switch fault flag bit carries out short trouble according to step 2～5 pair qualified branch and searches as working as preceding switch;
8) fault is isolated, all the non-interconnection switches that will work as in preceding switch and the branch switch thereof disconnect, and the interconnection switch closure of the non-interconnection switch of correspondence place branch road is powered to recover the normal region.
Preferably, in the described algorithm, when carrying out in twos relatively to the electric current warning mark position of switch, use be the logical exclusive-OR operation, by this manner of comparison, the supplier of electricity that changes in can compatible electrical network to.
Preferably, in the described algorithm, the method for test failure isolation required time is as follows:
When detecting large electric current, terminal opens the timer that carries, server finds short dot, terminal is received timeing closing device after the order of switch separating brake, this process required time is between 45～60ms, add terminal and detect ac period of large electric current need, total time is specially at 65ms～80ms:
1) terminal detects large electric current and needs ac period, i.e. a 20ms;
2) the required time of optical-fibre communications between terminal and the server, be no more than 10ms, because be that terminal mails to server with large electric current alarm signal at first, server needs after fault is judged to terminal transmit button sub-gate signal, so communication total time is no more than 20ms;
3) server time-delay 40ms;
4) time of implementation of end plaste and server program operation, can ignore.
Method of the present invention, than prior art, advantage is:
Short trouble is isolated and the service restoration system fast in the electrical network of the present invention, and when short trouble occurring in electrical network, this system can isolate short circuit trouble point rapidly, and finishes service restoration.Whole processing procedure is finished in 80ms, can disconnect at the power supply administration power circuit breaker that (200ms) is front to be finished.Whole process need not human intervention, meets the growth requirement of intelligent grid, also the just requirement of intelligent grid " self-healing " function.
Description of drawings
Fig. 1 is system architecture diagram of the present invention.
Fig. 2 is that short trouble occurs in the transmission line schematic diagram outside the branch switch, and short dot is between switch A3 and A4, before wherein (a) is fault, (b) after the troubleshooting.
Fig. 3 is that short trouble occurs in the transmission line schematic diagram between the branch switch, and short dot is between switch A2, A3, B1 and C1, before wherein (a) is fault, (b) after the troubleshooting.
Fig. 4 is terminal slave computer flow chart of the present invention.
Fig. 5 is host computer troubleshooting main program flow chart of the present invention.
Embodiment
Shown in 1, the quick isolation of short trouble and service restoration system in a kind of electrical network of the present invention comprise by reference to the accompanying drawings:
1. some terminal slave computers: each terminal places by the switch, is used for the operating current of this switch of monitoring, and be responsible for this switch of control deciliter.Each terminal mainly is comprised of master controller, network communication module, sampling module, memory module and relay.Terminal Design is take the LPC2364 of NXP company as master controller, this controller has comprised the 10/100Mbps ethernet mac, only need add PHY layer network communication module chip and with the network port of network transformer, can realize and control centre's PC between communication, PHY layer chip selected DP83848.For reliability and the speed that improves communication, we convert the signal of telecommunication of network port output to light signal, use optical fiber as communication media.The fibre core of monomode fiber is corresponding thinner, and the range loss of single mode signal is less than multimode, and transmission frequency bandwidth, capacity are large, long transmission distance.The optical-electrical converter that the design uses is selected the monomode fiber transceiver of TP-LINK company, and model is TR-962D.Sample with the AD thief hatch that LPC2364 carries.Storage server IP, each terminal IP and Short-Circuit High Current threshold value in the memory module.Relay be used for subscriber switch that each terminal of control connects deciliter.
2. control centre's server host computer: based on the real time information management system of Web, be that client is connected with database by Web server in the local area network (LAN), the real-time, interactive of realization data.Operating system adopts Windows 2000Server, and programming language is Java language, and adopts Java product Tomcat as the Web server of native system, selects the dynamic interaction function between JSP technology realization Web system and user.Adopt SQL Server 2000 databases, take sql like language as the database operating instruction language.Position of the switch relation according to reality on the host computer interface is arranged net.Host computer can send real-time current inquiry, switch control command to terminal, reception is from real-time current information and the large electric current alarm signal of each terminal, according to large electric current alarm signal, in 80ms, isolate short circuit trouble point, and make power supply dispatching to recover the power supply of normal region.
Particularly:
1) switch classification: the switch in the electrical network mainly divides two classes: interconnection switch and block switch.Interconnection switch is the switch that plays the contact effect between the branch line of two main feeders, two transformer stations or loop pattern, and an interconnection switch can only be arranged on every branch line, and interconnection switch generally disconnects.Block switch then is to be placed between the part of path, and a long transmission line has been divided into the switch of many part of paths, generally is closed.Interconnection switch and block switch can be changed mutually according to the load condition of circuit, realize For Distribution Networks Reconfiguration, to reach the purpose of balanced load.Native system utilizes interconnection switch and block switch to carry out automatic short-circuit isolation and service restoration simultaneously.B2, A5, C2 are the interconnection switch of place branch road among Fig. 2, and all the other are block switch.
2) circuit setting: according to the position of actual switch, finish configuration of power network on the host computer web interface, as shown in Figure 2, then the attribute of each switch arranged, the attribute of each switch can represent with following data structure:
Switch A1, A2, A3, A4, A5 belong to same branch road in the accompanying drawing 2, and B1, B2, B3 and C1, C2, C3 belong to respectively two other branch road.In the same branch road, (Branch_Flag) is identical for the branch labels of all switches.
3) all interconnection switches are stored in the following array of pointers:
StructSwitch*InterconnectionSwitchTbl[InterconnectionSwi tchCnt]; // interconnection switch table
In the accompanying drawing 3, short trouble occurs between switch A3 and the A4, short dot can be isolated by disconnecting A3 and A4, and in order to recover the power supply of circuit normal region between A4 and the A5, need to be with interconnection switch (A5) closure of A4 place branch road.The method of power supply dispatching is: InterconnectionSwitchTbl[in the interconnection switch table] in search the interconnection switch identical with A4 branch labels (Branch_Flag), then with its closure.
If the interconnection switch sign (IsInterconnectionSwitch) of certain switch is 1, a branch road then this switch should be added the interconnection switch table: because can only have at most an interconnection switch, so at first will check and whether have the interconnection switch identical with this switch branch sign (Branch_Flag) in the interconnection switch table, if exist, then cancel first the interconnection switch sign (with its IsInterconnectionSwitch zero clearing 0) of former directing switch, then corresponding list index is revised, pointed to this switch; As also there not being the interconnection switch of corresponding branch road in the tabulation, then this switch is joined the table afterbody.
4) warning divides two kinds, and large electric current is reported to the police and short trouble is reported to the police.It is that terminal sends to host computer that large electric current is reported to the police, and shows that large electric current has appearred in the switch place that this terminal is monitored.This alarm signal is sightless to the user, and mainly being provides foundation for searching of host computer short circuit trouble point.It is that host computer is reported to the police according to the large electric current of all switches in the electrical network that short trouble is reported to the police, judge the place that short trouble occurs after, to the warning that the user sends, show that short dot is just between certain two or a few switches.
5) according to the difference of fault scene, can be divided into two kinds to the mode of Fault Isolation, respectively shown in accompanying drawing 2 and accompanying drawing 3.
In accompanying drawing 2 and the accompanying drawing 3, switch B2, A5, C2 are interconnection switch, and all the other are block switch, and some O is the breakout of circuit.The switch that will link to each other with breakout for convenience, is called branch switch.Short trouble occurs between switch A3 and the A4 among Fig. 2, that is, short dot is outside branch switch.At this moment, only need the switch on short dot both sides, namely switch A3 and A4 are disconnected, then the interconnection switch A5 with the place branch road is closed, can realize Fault Isolation and power supply dispatching.
Among Fig. 3, short trouble occurs between switch A2, A 3, B1, the C1, that is, short dot is between branch switch.At this moment, short dot is equivalent at circuit OA, OB, OC, OD, so only have switch A2, A3, B1, C1 is disconnected and short dot could be isolated, and then the equal closure of interconnection switch B2, A5, C2 with three branch lines could realize power supply dispatching.
6) when short dot is in the circuit adjacent with interconnection switch, needing to disconnect interconnection switch could isolate short dot.Yet because circuit is when normal, interconnection switch just was in off-state originally, so after host computer finds the fault point, need not to send the separating brake order to this interconnection switch again.Simultaneously, the service restoration of this branch road also need not to carry out in this case because the branch road service restoration needs the interconnection switch of closed place branch road, and this can so that the short dot that originally is isolated out again get back in the electrical network.Therefore, in the judgement of Fault Isolation and power supply dispatching, should consider this situation.
7) the terminal slave computer is as follows to the Real Time Monitoring mode of electric current:
The high-voltage great-current Mutual Inductance Coupling is the little electric current of low pressure, convert magnitude of voltage to through load resistance, 3 the AD thief hatchs samplings of three-phase electricity through being carried by LPC2364 respectively after setovering, magnitude of voltage according to each ac period sampling calculates effective value, then extrapolate actual high-tension electricity flow valuve according to the mutual inductance ratio inverse, and compare with the short circuit current threshold value, if surpassed threshold value, then send large electric current to the server host computer and report to the police, illustrate that this terminal detects electric current and transfinites.
After with Fault Isolation, the electric current in the electrical network can return to normal level.Reach two minutes when the duration, the terminal that exists large electric current to report to the police originally can be cancelled large electric current to the host computer request and report to the police.
Terminal realizes that large electric current is reported to the police and switch is controlled corresponding software workflow as shown in Figure 4.
8) among Fig. 2 (a), when short trouble occurring between subscriber switch A3 and A4, all can monitor large electric current at switch A1, A2, the other end plaste of A3, and send large electric current alarm signal to control centre, control centre after receiving the alarm signal of each terminal with its position, large electric current warning mark position to inductive switch.Because the alarm signal of each terminal to report can not arrive simultaneously, so set host computer after receiving first alarm signal, time-delay 40ms (two ac periods) is with the synchronously large electric current warning of all terminals, then from the root node switch, carry out recurrence relatively, find and isolate short circuit trouble point after carry out power supply dispatching, to ensure the power supply of circuit normal region.The host computer fault is judged and is processed corresponding software flow pattern as shown in Figure 5.
9) similar traversal of tree travels through the switch in the whole electrical network in the mode of recursive lookup, finds and isolates short circuit trouble point and carry out corresponding power supply dispatching.Arthmetic statement is as follows:
1, initialization when preceding switch be the root node switch.
2, 〉=2 whether current switch branch number? be then to jump to step 6, otherwise jump to step 3.
3 ,=1 whether current switch branch number? be then to jump to step 4, otherwise short trouble be described not in the branch when the preceding switch place, end is searched by current branch.
4, when the warning mark position of preceding switch and branch switch thereof whether identical? the identical step 5 that then jumps to, difference then jumps to step 8.
5, be its branch switch with current switch update, get back to step 2 and continue to search short circuit trouble point.
Are 6, be 1 when whether preceding switch and all branches thereof have and only have the fault flag of a switch, all the other 0? being then to jump to step 8, is not then to jump to step 7.
7, branch switch that successively will be identical with current switch fault flag bit carries out short trouble according to step 2～5 pair qualified branch and searches as working as preceding switch.
8, all the non-interconnection switches that will work as in preceding switch and the branch switch thereof disconnect (interconnection switch just was in off-state originally), and the interconnection switch closure of the non-interconnection switch of correspondence place branch road is powered to recover the normal region.
Idiographic flow is as follows:
10) in the above-mentioned algorithm, when carrying out in twos relatively to the large electric current warning mark position of adjacent switch, use be the logical exclusive-OR operation.By this manner of comparison, the supplier of electricity that changes in can compatible electrical network to.
11) method of test failure isolation required time is as follows:
When detecting large electric current, terminal opens the timer that LPC2364 carries, the switch separating brake order of receiving server (illustrates that server has found short dot, and the switch on short dot both sides sent the separating brake order) after the timeing closing device, through experimental verification, this process required time is between 45～60ms, add terminal and detect ac period of large electric current need, total time is at 65ms～80ms.Be specially:
1. terminal detects large electric current and needs ac period, i.e. a 20ms;
2. required time of optical-fibre communications between terminal and the server, be no more than 10ms, because be that terminal mails to server with large electric current alarm signal at first, server needs after fault is judged to terminal transmit button sub-gate signal, so communication total time is no more than 20ms;
3. server time-delay 40ms;
4. the time of implementation of end plaste and server program operation, can ignore.
Above-described embodiment just is to allow the one of ordinary skilled in the art can understand content of the present invention and according to this enforcement for technical conceive of the present invention and characteristics being described, its objective is, can not limit protection scope of the present invention with this.Variation or the modification of every equivalence that the essence of content has been done according to the present invention all should be encompassed in protection scope of the present invention.
Claims (10)
1. short trouble fast isolation and service restoration system in the electrical network, electrical network is characterized in that by webserver real-time information management system, comprising:
Some terminal slave computers: the terminal slave computer is arranged at by the switch in the electrical network, is used for the operating current of this switch of monitoring, and be responsible for this switch of control deciliter; Each terminal slave computer mainly is comprised of master controller, network communication module, sampling module, memory module and relay, and master controller is combined with the network communication module, the communication between realization and the control centre's server host computer; Relay be used for switch that each terminal slave computer of control monitors deciliter;
Control centre's server host computer: the position of the switch relation according to reality on control centre server host computer interface is arranged net, control centre's server host computer can send real-time current inquiry, switch control command to terminal, reception is from real-time current information and the large electric current alarm signal of each terminal, and according to large electric current alarm signal, the isolation short circuit trouble point is made power supply dispatching to recover the power supply of normal region rapidly.
2. short trouble is isolated and the service restoration system fast in the electrical network according to claim 1, it is characterized in that, described master controller has comprised the 10/100Mbps ethernet mac, in conjunction with PHY layer network communication module chip with the network port of network transformer, realize and control centre's PC between communication.
3. short trouble fast isolation and service restoration system in the electrical network according to claim 1 is characterized in that in the described network communication module, output port is provided with optical-electrical converter, converts the electrical signal to light signal, then with optical fiber as communication media.
4. short trouble is isolated and the service restoration system fast in the electrical network according to claim 3, it is characterized in that, described optical-electrical converter adopts the monomode fiber transceiver.
5. short trouble is isolated and the service restoration system fast in the electrical network according to claim 1, it is characterized in that storage server IP, each terminal IP and Short-Circuit High Current threshold value in the described memory module.
6. short trouble is isolated and the service restoration system fast in the electrical network according to claim 1, it is characterized in that, the operating system in the described control centre server host computer adopts Windows 2000Server, and programming language is Java language; Select the dynamic interaction function between JSP technology realization Web system and user; Adopt SQL Server 2000 databases, take sql like language as the database operating instruction language.
7. short trouble is isolated and the service restoration system fast in the electrical network according to claim 1, it is characterized in that, described control centre server host computer can be isolated short circuit trouble point according to large electric current alarm signal in 80ms, and makes power supply dispatching to recover the power supply of normal region.
8. fast isolation and service restoration method of short trouble in the electrical network, it is characterized in that, adopt similar traversal of tree, in the mode of recursive lookup the switch in the whole electrical network is traveled through, find and isolate short circuit trouble point and carry out corresponding power supply dispatching, specific algorithm is as follows:
1) initialization when preceding switch be the root node switch;
2) 〉=2 whether current switch branch number? be then to jump to step 6, otherwise jump to step 3;
3)=1 whether current switch branch number? be then to jump to step 4, otherwise short trouble be described not in the branch when the preceding switch place, end is searched by current branch;
4) when the electric current warning mark position of preceding switch and branch switch thereof whether identical? the identical step 5 that then jumps to, difference then jumps to step 8;
5) be its branch switch with current switch update, get back to step 2 and continue to search short circuit trouble point;
Are 6) be 1 when whether preceding switch and all branches thereof have and only have the fault flag of a switch, all the other 0? being then to jump to step 8, is not then to jump to step 7;
7) branch switch that successively will be identical with current switch fault flag bit carries out short trouble according to step 2～5 pair qualified branch and searches as working as preceding switch;
8) fault is isolated, all the non-interconnection switches that will work as in preceding switch and the branch switch thereof disconnect, and the interconnection switch closure of the non-interconnection switch of correspondence place branch road is powered to recover the normal region.
9. short trouble is isolated and the service restoration method fast in the electrical network according to claim 8, it is characterized in that, in the described algorithm, when the electric current warning mark position of switch is carried out comparing in twos, what use is the logical exclusive-OR operation, by this manner of comparison, the supplier of electricity that changes in can compatible electrical network to.
10. short trouble is isolated and the service restoration method fast in the electrical network according to claim 8, it is characterized in that, in the described algorithm, the method for test failure isolation required time is as follows:
When detecting large electric current, terminal opens the timer that carries, server finds short dot, terminal is received timeing closing device after the order of switch separating brake, this process required time is between 45～60ms, add terminal and detect ac period of large electric current need, total time is specially at 65ms～80ms:
1) terminal detects large electric current and needs ac period, i.e. a 20ms;
2) the required time of optical-fibre communications between terminal and the server, be no more than 10ms, because be that terminal mails to server with large electric current alarm signal at first, server needs after fault is judged to terminal transmit button sub-gate signal, so communication total time is no more than 20ms;
3) server time-delay 40ms;
4) time of implementation of end plaste and server program operation, can ignore.
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| CN114899944A (en) * | 2022-04-14 | 2022-08-12 | 昂顿科技（上海）有限公司 | Communication management machine |
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