CN103390887A - Method for isolating faults of power distribution system with micro-grid - Google Patents
Method for isolating faults of power distribution system with micro-grid Download PDFInfo
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- CN103390887A CN103390887A CN2013103408037A CN201310340803A CN103390887A CN 103390887 A CN103390887 A CN 103390887A CN 2013103408037 A CN2013103408037 A CN 2013103408037A CN 201310340803 A CN201310340803 A CN 201310340803A CN 103390887 A CN103390887 A CN 103390887A
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- 238000000926 separation method Methods 0.000 claims description 21
- 230000000052 comparative effect Effects 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 238000002955 isolation Methods 0.000 abstract description 9
- 238000004891 communication Methods 0.000 abstract description 7
- 230000000875 corresponding effect Effects 0.000 description 4
- 230000002596 correlated effect Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention relates to a method for isolating faults of a power distribution system with a micro-grid. The difference between an effective value of short-circuit current flowing through nodes at two ends of a line where a short-circuit fault point of the system is located and an effective value of short-circuit current flowing through nodes at two ends of a line free of a short-circuit fault point is utilized, FTUs (field transfer units) which are matched and mounted with a circuit breaker in the system are used for acquiring the effective value of short-circuit current flowing through each node in a short-circuit loop according to two conditions that the short-circuit fault points exist in a single power supply power section and a multiple-power supply section respectively, each FTU with a measured short-circuit current effective value acquires short-circuit current effective values, measured by other FTUs, of the node and an adjacent node with the provided method, and whether a trip instruction is sent to a corresponding circuit breaker is determined with the adoption of provided judgment logics, so that fault points can be selectively and rapidly cut off, problems about fault point positioning and isolation are effectively solved, the amount of information is small, the communication speed is high, and the implementation is easy.
Description
Technical field
The quick partition method in fault point when the present invention relates to distribution system inside and short trouble occurring.
Background technology
The exhaustion day by day of earth fossil energy and further serious environmental problem, people pay attention to more to clear energy sources and regenerative resource application, and distributed power generation is one of important way of application clear energy sources and regenerative resource.Existing research shows that the effective means of performance distributed power generation usefulness is with the form access distribution system of distributed power source with little electrical network.But the access of little electrical network has brought a series of new problems to distribution system; two-way flow as trend; little electrical network be incorporated into the power networks with two kinds of operating modes of independent operating under the size of short circuit current have larger difference etc., thereby make traditional distribution protection method can't realize the quick isolation of fault point when short trouble appears in distribution system.
Realize this mode, distribution automation is necessary prerequisite.The feed line automatization system that consists of distribution main website, substation and line feed terminals has at present started to be applied in power distribution network, and this system adopts optical fiber communication as main communication mode.This feeder automation scheme based on communication is take centralized control as core; combine the various ways of current protection, RTU remote control and reclosing; can excise fast fault; realize Fault Isolation within the time of several seconds to tens seconds, realized restoring electricity of non-fault zone in tens seconds to a few minutes.But under special circumstances, as substation fault or passage, damage, the problem of feed line automatization system collapse likely occurs.Therefore, the method also is difficult to be applied in the protection of the distribution system that contains little electrical network and goes.
Summary of the invention
The invention provides a kind of new method that realizes containing the distribution system Fault Isolation of little electrical network based on node current information and circuit offside current information.After the distribution system that contains little electrical network has been equipped with feeder automation terminal equipment and has possessed communication function, when short trouble appears in section, certainly existing notable difference between the short circuit current effective value that the short circuit current effective value that in fault loop, circuit two ends, short circuit trouble point place node-flow is crossed and other circuit two ends node-flow are crossed within it.Difference by the effective value to each node in fault loop and the short circuit current that flows through between adjacent node is with it analyzed comparison, can accomplish to excise quickly and accurately fault point.
Technical solution problem of the present invention adopts following technical scheme to realize:
The distribution system failure separation method that contains little electrical network, the checkout gear that is provided with to detect the short circuit current effective value in system and realizes information exchange, each checkout gear determine that it is positioned at the section of single power supply or the section of multiple feed; Be arranged in the section of single power supply, at first the checkout gear to the upper node power inlet wire head end that is positioned at close mains side sends with all checkout gears that are positioned at lower node the short circuit current effective value that self obtains, and receive the short circuit current effective value that obtains separately that they send, compare again these short circuit current effective values, determine whether to the circuit breaker of correspondence, send out trip command according to comparative result finally; Be arranged in the section of multiple feed, same by comparing the short circuit current effective value, determining whether to the circuit breaker of correspondence, send out trip command, is to obtain the short circuit current effective value that will compare from the checkout gear that is positioned at other circuit head end of same node and the checkout gear that is positioned at this circuit opposite end at this moment.
The distribution system failure separation method that contains little electrical network, when short trouble appears in little electrical network of many power supplys, can inject from two ends the circuit of short circuit current all at this circuit two ends installing circuit breaker and supporting corresponding checkout gear, can be all only that end installing circuit breaker and supporting corresponding checkout gear in the short circuit current inflow of circuit from the circuit of an end injection short circuit current.
The distribution system failure separation method that contains little electrical network, the difference of the checkout gear number that a certain node line way in little electrical network is relevant to this node is for the moment, judge that this node is arranged in the network of single power supply section, and be unkitted the electric power incoming line of that circuit of checkout gear for this node.
the distribution system failure separation method that contains little electrical network, when the checkout gear that short circuit current detected and associated node are while being arranged in the network of single power supply section, this checkout gear will send with all checkout gears that are positioned at next node the short circuit current effective value that detects to the checkout gear of the electric power incoming line offside that is positioned at a upper node, then these checkout gears transmit short circuit current effective value size, the short circuit current effective value that this checkout gear is surveyed itself is respectively with upper, the short circuit current effective value that the adjacent checkout gear of lower node transmits is big or small, if comparative result is for equating or approximately equal, judge that fault point is not at this part of path, if being positioned at all checkout gears of next node, all to send the short circuit current effective value be that zero information is to this checkout gear, judge that fault point is at this part of path, this checkout gear sends trip command to the circuit breaker of correspondence.
The distribution system failure separation method that contains little electrical network, a certain checkout gear is received the short circuit current effective value that the adjacent checkout gear that is positioned at a node transmits, and short circuit current himself do not detected, must to send to that adjacent checkout gear the short circuit current effective value be zero information to this checkout gear.
The distribution system failure separation method that contains little electrical network, when the checkout gear that fault current detected and associated node are while being arranged in the network of multiple feed, this checkout gear sends to other all circuits that are connected with this node near the checkout gear of this node side and the checkout gear of this circuit offside detected short circuit current effective value, and receives the short circuit current effective value information that these checkout gears are sent.
The distribution system failure separation method that contains little electrical network, at first network the checkout gear that short circuit current detected related with certain node that is arranged in multiple feed judge that can the short circuit current effective value that other checkout gear related with this node transmits and the short circuit current effective value of itself surveying be divided into equivalent two groups, as can not, judge that this node bus is short-circuited, this checkout gear sends trip command to circuit breaker.
The distribution system failure separation method that contains little electrical network, be arranged in the network of multiple feed the checkout gear that short circuit current detected related with certain node the short circuit current effective value that other related checkout gear of judgement and this node transmits can be divided into equivalent two groups but not have to equate with the short circuit current effective value of surveying own or approximately equalised situation under, if the short circuit current effective value that the short circuit current effective value that other checkout gear detects is surveyed greater than itself, judge that fault point is not at this part of path.
the distribution system failure separation method that contains little electrical network, be arranged in the network of multiple feed the checkout gear that fault current detected related with certain node the short circuit current effective value that other related checkout gear of its institute's fault current that detects of judgement and this node transmits can be divided into equivalent two groups and its detect short circuit current effective value that the short circuit current effective value transmits than other checkout gear all greatly have the short circuit current effective value that transmits with other checkout gear to equate or approximately equalised situation under, the short circuit current effective value that the checkout gear of the short circuit current effective value of again itself being surveyed and place circuit offside transmits is big or small, if comparative result is for equating or approximately equal, judge that fault point is not at this part of path, otherwise, judge that fault point is at this part of path, this checkout gear sends trip command to circuit breaker.
The distribution system failure separation method that contains little electrical network, described checkout gear are FTU.
Compared with prior art, beneficial effect of the present invention is:
1, the partial short circuit current effective value that detects with adjacent node that only utilizes that this section point detects the short circuit current effective value has solved the short trouble point location in the complicated distribution that contains little electrical network, the problem of isolation;
2, each FTU is in the short circuit current effective value information that records each other of sending and receiving only of the FTU with adjacent, and amount of information is little, communication speed is fast, be easy to realize;
3, each FTU sending and receiving short circuit current effective value only, do not have the requirement of Timing synchronization to the communication between different FTU.
Description of drawings
Fig. 1 is circuit theory schematic diagram of the present invention.Wherein QF1 to QF16 represents 16 circuit breakers, and has been equipped with corresponding FTU; L1 to L11 represents 11 supply lines; DG1, DG2 represent two place's distributed power sources; A, B, C, D, E, F represent 6 different nodes of system shown in Figure 1; QF3 below (the right) system can form little operation of power networks, and QF3 is in closure state and represents that little electrical network is incorporated into the power networks, and QF3 is in off-state and represents little electrical network islet operation.
Fig. 2 is the flow chart of this method.
Embodiment
Shown in accompanying drawing 1,2.Node D, E, F are positioned at the single power supply section, and the difference that is characterized as the line way FTU number relevant to this node of these nodes is one.If supposition short circuit trouble point place in the middle of circuit L9, at this moment, the FTU that the short circuit current effective value can be detected at the single power supply section is 12,13 and No. 14.According to the inventive method, be positioned at No. 13 FTU of D node and be positioned at No. 14 FTU of E node and will be respectively to the FTU of the electric power incoming line offside that is positioned at himself upper node and all FTU of being positioned at next node, send the fault current effective value that detects, receive then that to be adjacent the short circuit current effective value that the relevant FTU of node transmits big or small.The short circuit current effective value that transmits of FTU adjacent with upper and lower node is big or small respectively for the short circuit current effective value that No. 13 FTU survey itself, comparative result is for equating or approximately equal, judge that fault point is not at the L8 at No. 13 FTU places part of path, No. 14 FTU that are positioned at the E node receive that the short circuit current effective value that the relevant FTU of F node sends is zero, judge that fault point is at the L9 at its place part of path, therefore No. 14 FTU send trip command to the circuit breaker Q F14 of correspondence, QF14 circuit breaker correct operation, realized Fault Isolation.
Node A, B, F are arranged in the section of multiple feed, and the line way FTU number relevant to this node that be characterized as of these nodes equates.suppose short circuit trouble point place in the middle of circuit L4, if little electrical network of QF3 below (the right) is in the state of being incorporated into the power networks, the short circuit current effective value equal and opposite in direction that the FTU1 that this moment, the A node was correlated with and FTU2 detect, FTU2 further compares the size of short circuit current effective value with the FTU3 that is positioned at its place circuit offside, equal and opposite in direction equally, therefore the equal failure judgement point of FTU of all startups of A node is not on the circuit at its place, the FTU3 that the B node is relevant, FTU4 and FTU7 have detected the short circuit current effective value, the fault current effective value sum equal and opposite in direction that the short circuit current effective value of surveying due to FTU7 and FTU3 and FTU4 survey, but failure judgement point is not on the circuit at FTU3 and FTU4 place, FTU7 further compares the size of short circuit current effective value with the FTU8 that is positioned at its place circuit offside, short circuit current effective value big or small unequal, therefore the FTU7 failure judgement point that the B node starts is on the circuit at its place, FTU7 sends trip command to the circuit breaker Q F7 of correspondence, QF7 circuit breaker correct operation, the short circuit current effective value equal and opposite in direction that the FTU8 that the C node is relevant and FTU9 detect, FTU8 further compares the size of short circuit current effective value with the FTU7 that is positioned at its place circuit offside, equally, short circuit current effective value big or small unequal, therefore the FTU8 failure judgement point that the C node starts is on the circuit at its place, FTU8 sends trip command to the circuit breaker Q F8 of correspondence, and QF7 circuit breaker correct operation, realized Fault Isolation.
Suppose still place in the middle of circuit L4 of short circuit trouble point, if little electrical network is in the islet operation state, QF3 disconnects.The short circuit current effective value equal and opposite in direction that the FTU4 that this moment, the B node was correlated with and FTU7 detect, FTU7 further compares the size of short circuit current effective value with the FTU3 that is positioned at its place circuit offside, short circuit current effective value big or small unequal, therefore the FTU7 failure judgement point that the B node starts is on the circuit at its place, FTU7 sends trip command to the circuit breaker Q F7 of correspondence, QF7 circuit breaker correct operation; The short circuit current effective value equal and opposite in direction that the FTU8 that the C node is relevant and FTU9 detect, FTU8 further compares the size of fault current effective value with the FTU7 that is positioned at its place circuit offside, equally, short circuit current effective value big or small unequal, therefore the FTU8 failure judgement point that the C node starts is on the circuit at its place, FTU8 sends trip command to the circuit breaker Q F8 of correspondence, and QF7 circuit breaker correct operation, realized Fault Isolation.
Suppose that more little electrical network is in while being incorporated into the power networks state, node (bus) the B fault that is short-circuited.Relevant FTU3, FTU4 and the FTU7 of B node this moment detected the short circuit current effective value, the short circuit current effective value that the short circuit current effective value that detects due to FTU3 detects much larger than FTU4 and FTU7, so FTU3, FTU4 and FTU7 can't be divided into three short circuit current effective values equivalent two groups, therefore judge that B node (bus) is short-circuited, FTU3, FTU4 and FTU7 send trip command to corresponding circuit breaker separately respectively, three circuit breaker correct operations of QF3, QF4 and QF7, realized Fault Isolation.
Claims (10)
1. the distribution system failure separation method that contains little electrical network, the checkout gear that is provided with to detect the short circuit current effective value in system and realizes information exchange, each checkout gear determine that it is positioned at the section of single power supply or the section of multiple feed; Be arranged in the section of single power supply, at first the checkout gear to first section of the upper node power inlet wire that is positioned at close mains side sends with all checkout gears that are positioned at lower node the short circuit current effective value that self obtains, and receive the short circuit current effective value that obtains separately that they send, compare again these short circuit current effective values, determine whether to the circuit breaker of correspondence, send out trip command according to comparative result finally; Be arranged in the section of multiple feed, same by comparing the short circuit current effective value, determining whether to the circuit breaker of correspondence, send out trip command, is to obtain the short circuit current effective value that will compare from the checkout gear that is positioned at other circuit head end of same node and the checkout gear that is positioned at this circuit opposite end at this moment.
2. the distribution system failure separation method that contains little electrical network according to claim 1, it is characterized in that when short trouble appears in little electrical network of many power supplys, can inject from two ends the circuit of short circuit current all at this circuit two ends installing circuit breaker and supporting corresponding checkout gear, can be all only that end installing circuit breaker and supporting corresponding checkout gear in the short circuit current inflow of circuit from the circuit of an end injection short circuit current.
3. the distribution system failure separation method that contains little electrical network according to claim 1, it is characterized in that the difference of the checkout gear number that the interior a certain node line way of little electrical network is relevant to this node is for for the moment, judge that this node is arranged in the network of single power supply section, and be unkitted the electric power incoming line of that circuit of checkout gear for this node.
4. the distribution system failure separation method that contains little electrical network according to claim 1, it is characterized in that when the checkout gear that short circuit current detected and associated node be while being arranged in the network of single power supply section, this checkout gear will send with all checkout gears that are positioned at next node the short circuit current effective value that detects to the checkout gear of the electric power incoming line offside that is positioned at a upper node, then these checkout gears transmit short circuit current effective value size, the short circuit current effective value that this checkout gear is surveyed itself is respectively with upper, the short circuit current effective value that the adjacent checkout gear of lower node transmits is big or small, if comparative result is for equating or approximately equal, judge that fault point is not at this part of path, if being positioned at all checkout gears of next node, all to send the short circuit current effective value be that zero information is to this checkout gear, judge that fault point is at this part of path, this checkout gear sends trip command to the circuit breaker of correspondence.
5. the distribution system failure separation method that contains little electrical network according to claim 4, it is characterized in that a certain checkout gear receives the short circuit current effective value that the adjacent checkout gear that is positioned at a node transmits, and short circuit current himself do not detected, must to send to that adjacent checkout gear the short circuit current effective value be zero information to this checkout gear.
6. the distribution system failure separation method that contains little electrical network according to claim 1, it is characterized in that when the checkout gear that short circuit current detected and associated node be while being arranged in the network of multiple feed, this checkout gear sends to other all circuits that are connected with this node near the checkout gear of this node side and the checkout gear of this circuit offside detected short circuit current effective value, and receives the short circuit current effective value information that these checkout gears are sent.
7. the distribution system failure separation method that contains little electrical network according to claim 1, it is characterized in that at first network the checkout gear that fault current detected related with certain node that is arranged in multiple feed judge that can the short circuit current effective value that other checkout gear related with this node transmits and the short circuit current effective value of itself surveying be divided into equivalent two groups, as not judging that this node bus is short-circuited, this checkout gear sends trip command to circuit breaker.
8. the distribution system failure separation method that contains little electrical network according to claim 7, it is characterized in that being arranged in the network of multiple feed the checkout gear that short circuit current detected related with certain node the short circuit current effective value that other related checkout gear of judgement and this node transmits can be divided into equivalent two groups but not have to equate with the short circuit current effective value of surveying own or approximately equalised situation under, if the short circuit current effective value that the short circuit current effective value that other checkout gear detects is surveyed greater than itself, judge that fault point is not at this part of path.
9. the distribution system failure separation method that contains little electrical network according to claim 7, it is characterized in that being arranged in the network of multiple feed the checkout gear that fault current detected related with certain node the short circuit current effective value that judgement and related other checkout gear of this node transmit can be divided into equivalent two groups and its detect short circuit current effective value that the short circuit current effective value transmits than other checkout gear all greatly have the short circuit current effective value that transmits with other checkout gear to equate or approximately equalised situation under, the short circuit current effective value that the checkout gear of the short circuit current effective value of again itself being surveyed and place circuit offside transmits is big or small, if comparative result is for equating or approximately equal, judge that fault point is not at this part of path, otherwise, judge that fault point is at this part of path, this checkout gear sends trip command to circuit breaker.
10. the described distribution system failure separation method that contains little electrical network of according to claim 1-9 any one, is characterized in that described checkout gear is FTU.
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| CN201310340803.7A CN103390887B (en) | 2013-08-07 | 2013-08-07 | Containing the distribution system failure separation method of micro-capacitance sensor |
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| CN201310340803.7A CN103390887B (en) | 2013-08-07 | 2013-08-07 | Containing the distribution system failure separation method of micro-capacitance sensor |
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Cited By (10)
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| CN105119255A (en) * | 2015-09-25 | 2015-12-02 | 国网山东省电力公司济南供电公司 | Photovoltaic microgrid fault isolation method based on fault state |
| CN105158640A (en) * | 2015-09-15 | 2015-12-16 | 江苏金智科技股份有限公司 | Multi-power-source power supply system and fault positioning method based on GPS and current waveform |
| CN105226619A (en) * | 2015-10-28 | 2016-01-06 | 南京新联电子股份有限公司 | The outer fault distinguishing method of distributed feeder automation district inner region |
| CN107843800A (en) * | 2017-10-20 | 2018-03-27 | 国家电网公司 | Supply network monitoring method, apparatus and system |
| CN110412417A (en) * | 2019-07-15 | 2019-11-05 | 中国人民解放军陆军工程大学 | Micro-grid data fault diagnosis method based on intelligent power monitoring instrument |
| CN110460026A (en) * | 2018-05-08 | 2019-11-15 | Ls产电株式会社 | Use the method for the orientation overcurrent grounding relay (DOCGR) and operation DOCGR of sampled value |
| CN110658419A (en) * | 2019-10-10 | 2020-01-07 | 石家庄科林电气股份有限公司 | Micro-grid fault positioning method based on incomplete information |
| CN113363952A (en) * | 2021-06-11 | 2021-09-07 | 国网江苏省电力有限公司无锡供电分公司 | Power distribution network protection alternating current circuit fault monitoring method based on adjacent node comparison |
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| CN105158640B (en) * | 2015-09-15 | 2018-07-20 | 江苏金智科技股份有限公司 | Multi-power supply system and Fault Locating Method based on GPS and current waveform |
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| CN110460026B (en) * | 2018-05-08 | 2021-09-07 | Ls产电株式会社 | Directional overcurrent ground relay (DOCGR) using sampled values and method of operating DOCGR |
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| CN117970186A (en) * | 2024-04-02 | 2024-05-03 | 山东普源电力工程有限公司 | Fault diagnosis method and system for distribution room |
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