CN107846015B - Intelligent power distribution network load transfer optimal path selection method based on peer-to-peer communication - Google Patents
Intelligent power distribution network load transfer optimal path selection method based on peer-to-peer communication Download PDFInfo
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- CN107846015B CN107846015B CN201711113849.XA CN201711113849A CN107846015B CN 107846015 B CN107846015 B CN 107846015B CN 201711113849 A CN201711113849 A CN 201711113849A CN 107846015 B CN107846015 B CN 107846015B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
Abstract
The invention discloses an intelligent power distribution network load transfer optimal path selection method based on peer-to-peer communication, which comprises the following steps of: the method comprises the following steps: the intelligent terminal periodically inspects the line, judges whether the line normally runs or not, if so, the terminal continues self-checking, and if not, the intelligent terminal enters the step two; step two: the intelligent terminal carries out fault positioning and fault identification to further complete fault removal, and if fault isolation is successful, the third step is carried out; step three: entering a fault transfer program, and judging a plurality of transfer paths according to the voltage at the transfer bus tie switch and the current information before the fault point fault to obtain an optimal load transfer path; step four: the routine is ended. The method can automatically perform optimal load transfer on the power-loss load, does not need the scheduling personnel to select the transfer path complexly by experience, reduces the workload of the scheduling personnel to a great extent, and improves the working efficiency and the accuracy.
Description
Technical Field
The invention relates to the field of power distribution, in particular to an intelligent power distribution network load transfer optimal path selection method based on peer-to-peer communication.
Background
With the rapid development of low-voltage power distribution networks in China, the power supply reliability directly influences the production and life of the society. In a power distribution network, a ring network connection mode is the most typical standby connection type, and meanwhile, connection modes of double power supplies and multiple power supplies in the power distribution network are more and more common. When a certain bus, a switch or a ring main unit of a distribution network needs to be overhauled or a certain part of the bus or the switch or the ring main unit breaks down, the load transfer is carried out on a power-off area except for the corresponding fault area needing to be isolated, and the power-off load is transferred to other buses or feeders connected with the power-off load through the loop closing operation, so that the power-off load shedding is realized, and the integral influence on the distribution network during the fault and the overhaul is reduced.
The electric equipment in the power distribution network is various, the wiring form is more and more complex, the transferable paths of a single feeder are also obviously increased, thereby forming a huge power supply network in which a plurality of lines can be mutually and reversely supplied, and the problem that one fault line can be reversely supplied by a plurality of lines often occurs. For the above line multi-path transfer problem, although the dispatcher can make a judgment and selection by a method of calculating all possible load transfer paths in advance, due to complexity of the operation condition of the power distribution network, when the power distribution network fails and the transfer paths need to be selected quickly to recover and isolate a power loss area, the dispatcher needs to consider the feeder line load condition and the current power distribution network topological structure comprehensively to make a judgment. Therefore, the workload of the dispatcher is greatly increased, the work error rate is increased, and the requirements of the modern power system cannot be met.
Disclosure of Invention
In order to solve the technical problems, the invention provides the method for selecting the optimal load transfer path of the intelligent power distribution network based on peer-to-peer communication, which has high working efficiency and high accuracy.
The technical scheme for solving the problems is as follows: a method for selecting an optimal path for intelligent power distribution network load transfer based on peer-to-peer communication comprises the following steps:
the method comprises the following steps: the intelligent terminal periodically inspects the line, judges whether the line normally runs or not, if so, the terminal continues self-checking, and if not, the intelligent terminal enters the step two;
step two: the intelligent terminal carries out fault positioning and fault identification to further complete fault removal, and if fault isolation is successful, the third step is carried out;
step three: entering a fault transfer program, and judging a plurality of transfer paths according to the voltage at the transfer bus tie switch and the current information before the fault point fault to obtain an optimal load transfer path;
step four: the routine is ended.
In the first step, when the line is normal, the intelligent terminal periodically inspects and checks the communication condition between the intelligent terminal and the adjacent terminal, if only one side terminal can not communicate, the neighbor of the neighbor terminal is used as a new neighbor terminal, and simultaneously each terminal updates the network topology information.
In the second step, the intelligent terminal has perfect fault positioning, identifying and isolating functions, acquires corresponding information, and positions and identifies faults according to various fault criteria, so that the fault removal and isolation work is completed.
The method for selecting the optimal path for transferring the load of the intelligent power distribution network based on the peer-to-peer communication comprises the following three specific steps:
3-1) when a short-circuit fault occurs at a certain position on a distribution line, tripping contact switches in a distribution room I and a distribution room II acting at two sides of the short-circuit position by an intelligent terminal to realize fault isolation, and losing power supply for the distribution room II far away from a transformer substation on the fault distribution line;
3-2) the intelligent terminal searches all power supply blocks and interconnection switches adjacent to the power distribution room II, and supposing that the power supply blocks with the interconnection switches obtained through searching arenA plurality of;
3-3) each intelligent terminal exchanges corresponding information with each other through a peer-to-peer communication mode to obtainnVoltage at the communication switch of each power supply blockv k ，v k Connecting the voltage at the switch for the kth power supply block, wherein k is less than or equal to n; simultaneously acquiring current before fault at faulti 0、nCurrent at terminal ring main unit of bus of power supply blocki j，i jIs as followsjThe current of the ring main unit at the tail end of each power supply block,j≤n；
3-4) comparisonnThe voltage of the power supply block at the communication switch is higher, and the higher the voltage value is, the higher the priority of the power supply transfer path selection is;
3-5) selecting the power supply block m with the highest priority according to the transfer priority in 3-4), wherein m is less than or equal to n,i mfor the current at the ring main unit at the tail end of the power supply block;
3-6) entering a current comparison link to enable the maximum current allowed by the power supply block m to bei mmaxComparison and judgment of intelligent terminal (i 0+i m)/i mmaxIf the number of the bus bars in the power supply block m is less than 1, closing a bus bar interconnection switch of the power supply block m, and outputting a power transfer path, namely the optimal power transfer path; if not, selecting the power supply block with the lower priority to repeatedly perform current comparison and judgment until a power transfer path meeting the conditions is searched, namely the optimal power transfer path.
The invention has the beneficial effects that: the method comprises the steps that different differential rings are formed by an equality communication network and a self-healing intelligent terminal to carry out fault location, fault identification and fault isolation; and after the fault isolation is successful, the interconnection switches in the power-off area are searched, the switching-on priority of each interconnection switch is obtained according to the corresponding voltage and current criteria, and the optimal switching-on path is selected. The method can automatically perform optimal load transfer on the power-loss load, does not need the scheduling personnel to select the transfer path complexly by experience, reduces the workload of the scheduling personnel to a great extent, and improves the working efficiency and the accuracy.
Drawings
Fig. 1 is a diagram of an intelligent distribution network model in an embodiment of the present invention.
Fig. 2 is a flowchart of a load transfer optimal path selection method according to an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the figures and examples.
As shown in fig. 1 and 2, a method for selecting an optimal path for transferring load of an intelligent distribution network based on peer-to-peer communication includes the following steps:
the method comprises the following steps: and the intelligent terminal periodically inspects the line, judges whether the line normally runs or not, if so, the terminal continues self-checking, and if not, the step II is carried out.
When the line is normal, the intelligent terminal periodically inspects and checks the communication condition between the intelligent terminal and the adjacent terminal, if only one side terminal can not communicate, the neighbor of the neighbor terminal is used as a new neighbor terminal, and simultaneously, each terminal updates network topology information.
Step two: and (4) carrying out fault positioning and fault identification by the intelligent terminal, further completing fault removal, and if fault isolation is successful, entering the step three. The intelligent terminal has perfect fault positioning, identifying and isolating functions, acquires corresponding information, positions and identifies faults according to various fault criteria, and further completes fault removal and isolating work.
Step three: and entering a fault transfer program, and judging a plurality of transfer paths according to the voltage at the transfer bus tie switch and the current information before the fault point fault to obtain the optimal load transfer path.
The method comprises the following specific steps:
3-1) as shown in fig. 1, when a short-circuit fault occurs on a F1 position on a distribution line, an intelligent terminal trips a contact switch S18 in a #7 power distribution room and a contact switch S19 in a #8 power distribution room which act on two sides of the short-circuit position to realize fault isolation, the #8 power distribution room far away from a transformer substation on the faulty distribution line loses power supply, and fault transfer is needed in the next step;
3-2) the intelligent terminal searches all power supply blocks and interconnection switches adjacent to the #8 power distribution room, wherein the power supply blocks obtained through searching are the transformer substations A and B;
3-3) each intelligent terminal exchanges corresponding information with each other in a peer-to-peer communication mode to acquire the voltage at the position of the interconnection switch S7v 1And the voltage at tie switch S15v 2Simultaneously acquiring the current before the F1 faulti 0Current at load #3i 1And current at #6 loadi 2；
3-4) comparing the voltage of the connection switch of the 2 power supply blocks, wherein the higher the voltage value is, the higher the priority of the power supply transfer path selection is;
3-5) selecting the power supply block with the highest priority according to the transfer priority in 3-4); if it isv 1≤v 2Directly entering a current comparison link of a transformer substation B, and entering the step 3-6); if it isv 1>v 2If so, entering a current comparison link of the transformer substation A, and entering the step 3-7);
3-6) in the current comparison link of the transformer substation B, the maximum current allowed by the transformer substation B is set asi BmaxComparison and judgment of terminal (i 0+i 2)/i BmaxWhether or not less than 1, ifi 0+i 2)/i Bmax<1, closing a contact switch S15, supplying power to a #8 power distribution room by a transformer substation B, and outputting a power supply switching path; if (i 0+i 2)/i BmaxIf the output is more than or equal to 1, ending the program and outputting without a transfer path;
3-7) in the current comparison link of the transformer substation A, the maximum current allowed by the transformer substation A is set asi AmaxComparison and judgment of terminal (i 0+i 1)/i AmaxWhether or not less than 1, ifi 0+i 1)/i Amax<1, closing a contact switch S7, supplying power to a #8 power distribution room by the substation A, and outputting a power supply switching path; if (i 0+i 1)/i AmaxAnd if the output is more than or equal to 1, ending the program and outputting without a transfer path.
Step four: the routine is ended.
In summary, the invention obtains the corresponding electrical quantity information through the peer-to-peer communication network on the basis of the intelligent terminal, and the setting judgment is carried out according to the method of the invention, so that the optimal transfer path selection of the power-losing load can be automatically realized, the power supply can be recovered, and the load transfer is frequently carried out by the scheduling personnel according to experience.
Claims (3)
1. A method for selecting an optimal path for intelligent power distribution network load transfer based on peer-to-peer communication comprises the following steps:
the method comprises the following steps: the intelligent terminal periodically inspects the line, judges whether the line normally runs or not, if so, the terminal continues self-checking, and if not, the intelligent terminal enters the step two;
step two: the intelligent terminal carries out fault positioning and fault identification to further complete fault removal, and if fault isolation is successful, the third step is carried out;
step three: entering a fault transfer program, and judging a plurality of transfer paths according to the voltage at the transfer bus tie switch and the current information before the fault point fault to obtain an optimal load transfer path;
the third step is as follows:
3-1) when a short-circuit fault occurs at a certain position on a distribution line, tripping contact switches in a distribution room I and a distribution room II acting at two sides of the short-circuit position by an intelligent terminal to realize fault isolation, and losing power supply for the distribution room II far away from a transformer substation on the fault distribution line;
3-2) searching all power supply blocks and interconnection switches adjacent to the power distribution room II by the intelligent terminal, and assuming that n power supply blocks with the interconnection switches are obtained through searching;
3-3) each intelligent terminal exchanges corresponding information with each other in a peer-to-peer communication mode to obtain the voltage v at the contact switch of the n power supply blocksk，vkConnecting the voltage at the switch for the kth power supply block, wherein k is less than or equal to n; simultaneously acquiring current i before fault at fault0And the current i at the ring main unit at the tail end of the n power supply block busesj，ijThe current at the ring main unit at the tail end of the jth power supply block is equal to or less than n;
3-4) comparing the voltage of the connection switch of the n power supply blocks, wherein the higher the voltage value is, the higher the priority of the power supply transfer path selection is;
3-5) selecting the power supply block m with the highest priority according to the transfer priority in 3-4), wherein m is less than or equal to n, imFor the current at the ring main unit at the tail end of the power supply block;
3-6) entering a current comparison link to enable the maximum current allowed by the power supply block m to be immaxComparison and judgment of intelligent terminal (i)0+im)/immaxIf the number of the bus bars in the power supply block m is less than 1, closing a bus bar interconnection switch of the power supply block m, and outputting a power transfer path, namely the optimal power transfer path; if not, selecting the power supply block with the lower priority to repeatedly carry out current comparison and judgment until a meeting strip is searchedThe transfer path of the part is the optimal transfer path;
step four: the routine is ended.
2. The method for selecting the optimal path for the load transfer of the intelligent distribution network based on the peer-to-peer communication according to claim 1, wherein: in the first step, when the line is normal, the intelligent terminal periodically inspects and simultaneously checks the communication condition between the intelligent terminal and the adjacent terminal, if only one side terminal can not communicate, the neighbor of the neighbor terminal is used as a new neighbor terminal, and meanwhile, each terminal updates the network topology information.
3. The method for selecting the optimal path for the load transfer of the intelligent distribution network based on the peer-to-peer communication according to claim 1, wherein: in the second step, the intelligent terminal has perfect fault positioning, identifying and isolating functions, acquires corresponding information, and positions and identifies faults according to various fault criteria, so that the fault removal and isolation work is completed.
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| CN108988341B (en) * | 2018-09-05 | 2020-11-17 | 国网山东省电力公司枣庄供电公司 | Power distribution equipment fault adjusting method and device |
| CN110601188B (en) * | 2019-09-20 | 2023-03-03 | 国网天津市电力公司 | Rapid processing method for large-area power failure of power distribution network based on optimal regional load transfer strategy |
| CN111882126A (en) * | 2020-07-24 | 2020-11-03 | 贵州电网有限责任公司 | N-1-1 static security check optimization method and system |
| CN112134263B (en) * | 2020-08-20 | 2022-08-19 | 南京因泰莱电器股份有限公司 | Distribution network self-healing method based on peer-to-peer information interaction |
| CN112134353B (en) * | 2020-09-01 | 2022-06-07 | 珠海欧力配网自动化股份有限公司 | Distributed power distribution method based on GOOSE and power distribution automation terminal |
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