CN103414173A - Method for performing fault recovery on power distribution network based on ultra-short term load - Google Patents
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Abstract
The invention discloses a method for performing fault recovery on a power distribution network based on ultra-short term load. The method comprises the following steps: predicting the load condition of the power distribution network in a future period by adopting an ultra-short term load prediction technology, wherein the maximum load occurring in the period is taken as calculated load; constructing a calculated load database by using the calculated load of each load node of the power distribution network; performing a fault recovery algorithm based on the calculated load database to obtain a fault recovery switching operation result. According to the method, the defects that certain electrical elements are overloaded, an outlet circuit breaker is tripped out or potential safety hazard occurs in non-fault elements and the power supply quality is influenced strictly since the conventional fault recovery method for the power distribution network cannot adapt to the load change in a time period from isolation of a field fault area to the removal of faults are overcome.
Description
Patent field
The invention belongs to distribution network failure recovery technology field and power system automation technology field, relate to the fault recovery of power distribution network, is a kind of restoration methods of distribution network failure based on ultra-short term specifically.
Background technology
Along with the raising of China's power distribution automation level, this just recovers to provide the support of many-sided data and technology for distribution network failure, simultaneously, also rapidity, fail safe, the reliability of recovery process are had higher requirement.In a single day power distribution network breaks down, and a large amount of information is sent to main station system at short notice, and how these information being recovered for distribution network failure is a good problem to study.
Balance, branch road capacity limit, network that distribution network failure recovers to consider between generators and loads keep the composite factors such as radial requirement, switching manipulation cost and network loss, so fault recovery is the multiple target of a complexity, the combinatorial optimization problem of non-linear, multiple constraint.Chinese scholars has proposed a lot of methods and has addressed this problem, and is broadly divided into three classes: traditional optimized algorithm, heuritic approach and intelligent algorithm.Intelligent algorithm has obtained research widely with its distinct advantages, as (Liu Li such as Liu Li, Chen Xueyun. based on the For Distribution Networks Reconfiguration [J] of fuzzy genetic algorithm. Proceedings of the CSEE, 2000,20(2): fuzzy genetic algorithm 66-69.) proposed, crossing-over rate and aberration rate are carried out to fuzzy control, effectively improved convergence rate, avoided premature convergence; Lu Zhi has just waited (Lu Zhigang, Dong Xiangyu. based on the distribution network failure that improves binary particle swarm algorithm, recover [J]. Automation of Electric Systems, 2006,30(24): 39-43.) when determining target function, introduced analytic hierarchy process (AHP) and solved the weight of each index, and adopted improved binary particle swarm algorithm to solve the fault recovery problem.But current distribution network failure restoration methods is all to adopt the load value of section fault time to carry out trend calculating, draws accordingly the fault recovery scheme.But the power distribution network load changes at any time, from after Fault Isolation, getting rid of in front a period of time to fault, load variations may cause some electric component overload or power supply quality to descend.Therefore, traditional fault recovery is difficult to meet the demand that the larger power distribution network of load fluctuation is carried out to fault recovery.
Summary of the invention
The objective of the invention is to adopt the load value before fault to carry out trend calculating and capacity verification in order to overcome traditional distribution network failure restoration methods, and drawn recovery scheme possibly can't adapt to the field failure zone isolation to fixing a breakdown rear grid-connected interior load variations of time, the shortcoming that causes some electric component overload or power supply quality to descend, proposed a kind of restoration methods of distribution network failure based on ultra-short term.
Before introducing technical scheme of the present invention, the technical term occurred in the present invention is described as follows:
1, fault zone: have the zone of the equipment such as bus, distribution line or transformer that permanent fault has occurred, can't carry out to the load be connected with faulty equipment normal power supply before fault restoration;
2, non-fault dead electricity district: refer to and affected by other fault zone and cause power failure, and do not have the zone of fault in should zone;
3, normal power supply zone: the power supply area outside fault zone and non-fault dead electricity district;
4, interconnection switch: the normal open switch of getting in touch with non-fault dead electricity district and normal power supply district;
5, block switch: two ends are all at the normally closed switch in non-fault dead electricity district or normal power supply district;
6, Level 1 support feeder line: by the feeder line that interconnection switch and power supply interrupted district directly are connected, the interconnection switch that connects Level 1 support feeder line and power failure district becomes the one-level interconnection switch;
7, interconnection switch reserve capacity: interconnection switch is to being that in whole electric equipments between the power supply of its power supply, the minimum value of rated current and actual current difference is called the maximum reserve capacity of this interconnection switch;
8, the transferable load of block switch: block switch can be to the load of certain interconnection switch transfer, and namely the load total amount in this block switch downstream, be called the transferable load of block switch for this interconnection switch;
The application is specifically by the following technical solutions:
A kind of restoration methods of distribution network failure based on ultra-short term provided by the invention is characterized in that described method comprises the steps:
(1) all load buses of power distribution network are carried out to ultra-short term;
(2) according to the load prediction value, build the calculated load database in prediction period;
(3) according to the calculated load database, carry out the fault recovery flow process, draw fault recovery switching manipulation result, carry out failure recovery operation.
The also further preferred following technical scheme of the application:
In the described restoration methods of distribution network failure based on ultra-short term, in described step (1), all load buses to power distribution network carry out ultra-short term, described ultra-short term refers to the load of predict future 5-120 minute, according to from the field failure zone isolation to the rear grid-connected time of fixing a breakdown, choosing prediction period, obtain the load prediction curve in prediction period.
In the described restoration methods of distribution network failure based on ultra-short term, in described step (2), according to the ultra-short term result of each node, the maximum that each node load is predicted the outcome, as the calculated load value of this node, constructs the calculated load database.
In the described restoration methods of distribution network failure based on ultra-short term, in described step (3), load data used is the load data in the calculated load database obtained in step (2) in failure recovering algorithm, and the step of distribution network failure recovery is as follows on this basis:
(a), according to the result of Fault Isolation, draw power distribution network normal power supply zone, fault zone and non-fault dead electricity zone, and calculate the dead electricity total amount in non-fault dead electricity district.
(b) find out all interconnection switches that are connected with non-fault dead electricity zone, and calculate the reserve capacity of the regional all interconnection switches that are connected with non-fault dead electricity district of normal power supply, and carry out descending arrangement by the size of reserve capacity;
(c) find out the interconnection switch that all reserve capacitys are greater than the dead electricity total amount in non-fault dead electricity district, if the dead electricity total amount that does not have the reserve capacity of interconnection switch to be greater than non-fault dead electricity district goes to step (d); If have, interconnection switch independent closure is successively turned and is with non-fault dead electricity zone and carries out trend calculating, whether check there will be voltage or the out-of-limit electric equipment of electric current, if the switching manipulation result of closure is feasible separately successively by interconnection switch there is no out-of-limit equipment, if out-of-limit equipment occurs, the switching manipulation result of closure is infeasible separately successively by interconnection switch, goes to step (d);
(d) find out the interconnection switch pair that all reserve capacity sums are greater than the dead electricity total amount in non-fault dead electricity district, if do not exist the reserve capacity sum to be greater than the interconnection switch of dead electricity total amount in non-fault dead electricity district to going to step (e); If exist the reserve capacity sum to be greater than the interconnection switch pair of the dead electricity total amount in non-fault dead electricity district, respectively by interconnection switch to closure, simultaneously the block switch on these two interconnection switch paths opened separately respectively and carried out trend calculating, whether check there will be voltage or the out-of-limit electric equipment of electric current, by interconnection switch, is feasible program to closed switching manipulation result if there is no out-of-limit electric equipment; Out-of-limit equipment goes to step (e) if occur;
(e) cutting load, by any two interconnection switch closures, simultaneously by the interconnection switch that block switch is opened separately respectively and the capacity of finding out is out-of-limit on these two interconnection switch paths, by this interconnection switch, be that starting point is carried out the range traversal search to block switch and drawn range traversal search sequence, block switch in sequence order is from back to front opened successively and carried out cutting load, until interconnection switch no longer capacity is out-of-limit, carry out again trend and calculate the electric equipment whether check there will be voltage out-of-limit, if there is the electric equipment of voltage out-of-limit, open first block switch searched from out-of-limit electric equipment to the interconnection switch direction, until after there is no the electric equipment of voltage out-of-limit, should hinder and recover the switching manipulation result as feasible program,
(f) select optimum fault recovery switching manipulation result, in above-mentioned each feasible fault recovery switching manipulation result, selecting the minimum fault recovery switching manipulation result of dead electricity load is optimal case; If the fault recovery switching manipulation result that when the dead electricity load was the same, the selector switch number of operations was little is optimal case; If the dead electricity load is all the same with the switching manipulation number of times, selecting the fault recovery switching manipulation result of loss minimization is optimal case, according to optimal case, carries out the failure recovery operation of power distribution network.
The invention has the beneficial effects as follows:
A kind of restoration methods of distribution network failure based on ultra-short term disclosed by the invention, utilize ultra-short term technological prediction to go out the power distribution network load condition of following a period of time, ultra-short term result according to each node, the maximum that each node load is predicted the outcome is as the calculated load value of this node, and then draws the fault recovery scheme.Overcome traditional distribution network failure fault moment that restoration methods adopts load value before and carried out trend calculating and capacity verification, drawn recovery scheme possibly can't adapt to the field failure zone isolation to the rear grid-connected interior load variations of time of fixing a breakdown, not only make some electric component overload and then cause the outlet breaker tripping operation or cause non-fault element generation potential safety hazard, also having had a strong impact on the shortcoming of power supply quality.
The accompanying drawing explanation
Fig. 1 is flow chart of the present invention;
Fig. 2 is the test circuit reduced graph that distribution network failure recovers;
Fig. 3 is the load prediction curve in test circuit load bus 5 prediction periods.
Embodiment
Below in conjunction with Figure of description and the specific embodiment technical scheme to the application, be described in further detail.
Be the restoration methods of the distribution network failure based on ultra-short term flow chart disclosed by the invention as shown in Figure 1.Power distribution network simulation model as shown in Figure 2, this system rated voltage is 10kV, contains 8 interconnection switch equipment, 10 load buses, 4 power supply nodes.Based on the distribution network failure of ultra-short term, recovering is exactly the residing running status of electrical network while occurring according to fault, the power distribution network load bus is carried out to ultra-short term, according to load prediction results, power distribution network is carried out to fault recovery, thereby guarantee that fail-over policy can adapt to the power distribution network load fluctuation.Concrete steps of the present invention are as follows:
(1) all load buses are carried out to ultra-short term.According to the actual load situation, select the suitable load forecasting method of ultra-short term, as method of linear extrapolation, neural network, SVMs etc., load bus 1-10 is carried out to ultra-short term, obtain the load prediction curve of each load bus 9:00-10:00.
(2) according to the load prediction value, build the calculated load database in prediction period.Take out the maximum of the node load in prediction period as the calculated load value, for example as shown in Figure 3, its calculated load value is 71+32.29kVA to the load prediction curve of node 5, show that the calculated load of each load bus builds the calculated load database.
(3) according to the calculated load database, carry out the fault recovery flow process, draw fault recovery switching manipulation scheme, carry out failure recovery operation.
In the described restoration methods of distribution network failure based on ultra-short term, in described step (3), load data used is the load data in the calculated load database obtained in step (2) in failure recovering algorithm, and the step of distribution network failure recovery is as follows on this basis:
(a), according to the result of Fault Isolation, draw power distribution network normal power supply zone, fault zone and non-fault dead electricity zone, and calculate the dead electricity total amount in non-fault dead electricity district.
(b) find out all interconnection switches that are connected with non-fault dead electricity zone, and calculate the reserve capacity of the regional all interconnection switches that are connected with non-fault dead electricity district of normal power supply, and carry out descending arrangement by the size of reserve capacity;
(c) find out the interconnection switch that all reserve capacitys are greater than the dead electricity total amount in non-fault dead electricity district, if the dead electricity total amount that does not have the reserve capacity of interconnection switch to be greater than non-fault dead electricity district goes to step (d); If have, interconnection switch independent closure is successively turned and is with non-fault dead electricity zone and carries out trend calculating, whether check there will be voltage or the out-of-limit electric equipment of electric current, if the scheme of closure is feasible separately successively by interconnection switch there is no out-of-limit equipment, if out-of-limit equipment occurs, the scheme of closure is infeasible separately successively by interconnection switch, goes to step (d);
(d) find out the interconnection switch pair that all reserve capacity sums are greater than the dead electricity total amount in non-fault dead electricity district, if do not exist the reserve capacity sum to be greater than the interconnection switch of dead electricity total amount in non-fault dead electricity district to going to step (e); If exist the reserve capacity sum to be greater than the interconnection switch pair of the dead electricity total amount in non-fault dead electricity district, respectively by interconnection switch to closure, simultaneously the block switch on these two interconnection switch paths opened separately respectively and carried out trend calculating, whether check there will be voltage or the out-of-limit electric equipment of electric current, by interconnection switch, is feasible program to closed scheme if there is no out-of-limit equipment; Out-of-limit equipment goes to step (e) if occur;
(e) cutting load, by any two interconnection switch closures, simultaneously by the interconnection switch that block switch is opened separately respectively and the capacity of finding out is out-of-limit on these two interconnection switch paths, by this interconnection switch, be that starting point is carried out the range traversal search to block switch and drawn range traversal search sequence, block switch in sequence order is from back to front opened successively and carried out cutting load, until interconnection switch no longer capacity is out-of-limit, carry out again trend and calculate the electric equipment whether check there will be voltage out-of-limit, if there is voltage out-of-limit, open first block switch searched from out-of-limit element to the interconnection switch direction, until after there is no voltage out-of-limit, should hinder and recover the switching manipulation scheme as feasible program,
(f) choose the best alternatives, in above-mentioned each feasible program, selecting the minimum scheme of dead electricity load is optimal case; If the scheme that when the dead electricity load was the same, the selector switch number of operations was little is optimal case; If the dead electricity load is all the same with the switching manipulation number of times, the scheme of selecting loss minimization is optimal case, according to optimal case, carries out the failure recovery operation of power distribution network.
Below in conjunction with following examples, step (3) is described in detail.
Example 1:
(a) bus 5 breaks down, and switch s4 and s7 open fault section isolation.According to the result of Fault Isolation, draw distribution network failure zone for [5], non-fault dead electricity zone [9], all the other are the normal power supply zone, and the dead electricity total amount that calculates non-fault dead electricity district is I=78A.
(b) finding out all interconnection switches that are connected with non-fault dead electricity zone is s8, and the reserve capacity of the regional all interconnection switches that are connected with non-fault dead electricity district of calculating normal power supply is I
S8=169A;
(c) to be greater than the interconnection switch of the dead electricity total amount in non-fault dead electricity district be s8 to reserve capacity; Interconnection switch s8 closure is turned and is with non-fault dead electricity zone and carries out trend calculating, do not have out-of-limit equipment this scheme be feasible program;
(d) feasible program only has closed interconnection switch s8, so this scheme is optimal case;
Example 2:
(a) bus 1 breaks down, switch s1 opens the isolated fault zone, according to the result of Fault Isolation, draw distribution network failure zone for [1], non-fault dead electricity zone [2347], all the other are the normal power supply zone, and the dead electricity total amount that calculates non-fault dead electricity district is I=178A.
(b) finding out all interconnection switches that are connected with non-fault dead electricity zone is s3, s6, and calculates the reserve capacity of the regional all interconnection switches that are connected with non-fault dead electricity district of normal power supply and be arranged as from big to small I
S6=158A, I
S3=69A;
(c) the dead electricity total amount that does not have the reserve capacity of interconnection switch to be greater than non-fault dead electricity district goes to step (d);
(d) find out all reserve capacity sums and be greater than the interconnection switch of dead electricity total amount in non-fault dead electricity district to for [s3s6]; By interconnection switch s3, s6 closure, block switch s2 opens and carries out trend calculating, do not have out-of-limit equipment this scheme be feasible program; By interconnection switch s3, s6 closure, block switch s5 opens and carries out trend calculating, and it is out-of-limit that electric current occurs interconnection switch s3, this scheme given up;
(e) feasible program only has interconnection switch s3, s6 closure, and block switch s2 opens, so this scheme is optimal case;
Finally should be noted that: only illustrate that in conjunction with above-described embodiment technical scheme of the present invention is not intended to limit.It will be understood by those skilled in the art that: those skilled in the art can modify or be equal to replacement the specific embodiment of the present invention, but these modifications or change are all among the claim protection range that application is awaited the reply.
Claims (4)
1. the restoration methods of the distribution network failure based on ultra-short term, is characterized in that, described method comprises the steps:
(1) all load buses of power distribution network are carried out to ultra-short term;
(2) according to the load prediction value, build the calculated load database in prediction period;
(3) according to the calculated load database, carry out the fault recovery flow process, draw fault recovery switching manipulation result, carry out failure recovery operation.
2. the restoration methods of the distribution network failure based on ultra-short term as claimed in claim 1, it is characterized in that, in described step (1), all load buses to power distribution network carry out ultra-short term, described ultra-short term refers to the load of predict future 5-120 minute, according to from the field failure zone isolation to the rear grid-connected time of fixing a breakdown, choosing prediction period, obtain the load prediction curve in prediction period.
3. the restoration methods of the distribution network failure based on ultra-short term as claimed in claim 1, it is characterized in that, in described step (2), ultra-short term result according to each node, the maximum that each node load is predicted the outcome, as the calculated load value of this node, constructs the calculated load database.
4. the described restoration methods of distribution network failure based on ultra-short term of claim as arbitrary as claim 1-3, it is characterized in that, in described step (3), load data used is the load data in the calculated load database obtained in step (2) in the fault recovery flow process, and it is as follows that distribution network failure recovers flow process:
(a), according to the result of Fault Isolation, draw power distribution network normal power supply zone, fault zone and non-fault dead electricity zone, and calculate the dead electricity total amount in non-fault dead electricity district.
(b) find out all interconnection switches that are connected with non-fault dead electricity zone, and calculate the reserve capacity of the regional all interconnection switches that are connected with non-fault dead electricity district of normal power supply, and carry out descending arrangement by the size of reserve capacity;
(c) find out the interconnection switch that all reserve capacitys are greater than the dead electricity total amount in non-fault dead electricity district, if the dead electricity total amount that does not have the reserve capacity of interconnection switch to be greater than non-fault dead electricity district goes to step (d); If have, interconnection switch independent closure is successively turned and is with non-fault dead electricity zone and carries out trend calculating, whether check there will be voltage or the out-of-limit electric equipment of electric current, if the switching manipulation result of closure is feasible separately successively by interconnection switch there is no out-of-limit equipment, if out-of-limit equipment occurs, the switching manipulation result of closure is infeasible separately successively by interconnection switch, goes to step (d);
(d) find out the interconnection switch pair that all reserve capacity sums are greater than the dead electricity total amount in non-fault dead electricity district, if do not exist the reserve capacity sum to be greater than the interconnection switch of dead electricity total amount in non-fault dead electricity district to going to step (e); If exist the reserve capacity sum to be greater than the interconnection switch pair of the dead electricity total amount in non-fault dead electricity district, respectively by interconnection switch to closure, simultaneously the block switch on these two interconnection switch paths opened separately respectively and carried out trend calculating, whether check there will be voltage or the out-of-limit electric equipment of electric current, by interconnection switch, is feasible program to closed switching manipulation result if there is no out-of-limit electric equipment; Out-of-limit equipment goes to step (e) if occur;
(e) cutting load, by any two interconnection switch closures, simultaneously by the interconnection switch that block switch is opened separately respectively and the capacity of finding out is out-of-limit on these two interconnection switch paths, by this interconnection switch, be that starting point is carried out the range traversal search to block switch and drawn range traversal search sequence, block switch in sequence order is from back to front opened successively and carried out cutting load, until interconnection switch no longer capacity is out-of-limit, carry out again trend and calculate the electric equipment whether check there will be voltage out-of-limit, if there is the electric equipment of voltage out-of-limit, open first block switch searched from out-of-limit electric equipment to the interconnection switch direction, until after there is no the electric equipment of voltage out-of-limit, should hinder and recover the switching manipulation result as feasible program,
(f) select optimum fault recovery switching manipulation result, in above-mentioned each feasible fault recovery switching manipulation result, selecting the minimum fault recovery switching manipulation result of dead electricity load is optimal case; If the fault recovery switching manipulation result that when the dead electricity load was the same, the selector switch number of operations was little is optimal case; If the dead electricity load is all the same with the switching manipulation number of times, selecting the fault recovery switching manipulation result of loss minimization is optimal case, according to optimal case, carries out the failure recovery operation of power distribution network.
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| CN103746376B (en) * | 2014-01-21 | 2015-09-09 | 重庆大学 | A kind of power distribution network dynamic power restoration method based on load curve |
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| CN104253437B (en) * | 2014-10-13 | 2016-09-21 | 国家电网公司 | A kind of loaded capacity-regulated method of distribution transformer based on short-term load forecasting |
| CN104518488B (en) * | 2014-12-30 | 2017-06-23 | 广西大学 | For the load point fault zone Type division method of distribution network reliability analysis |
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| CN105354417B (en) * | 2015-07-08 | 2018-09-28 | 国家电网公司 | It is a kind of meter and breaker tripping probability the method that restores electricity |
| CN105243451A (en) * | 2015-10-27 | 2016-01-13 | 福建奥通迈胜电力科技有限公司 | Optimized local shape similarity based microgrid ultra-short-term load forecasting method |
| CN105243451B (en) * | 2015-10-27 | 2019-06-07 | 福建奥通迈胜电力科技有限公司 | Based on the similar microgrid very Short-Term Load Forecasting Method of optimal partial shape |
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| CN106356847A (en) * | 2016-10-18 | 2017-01-25 | 国网江苏省电力公司电力科学研究院 | Multi-factor based power distribution network failure recovery method |
| CN108828375A (en) * | 2018-08-17 | 2018-11-16 | 国网江苏省电力有限公司电力科学研究院 | Air conditioning electricity monitoring system and monitoring method based on two-loop intelligent electric energy meter |
| CN108828375B (en) * | 2018-08-17 | 2020-08-14 | 国网江苏省电力有限公司电力科学研究院 | Air conditioner electric monitoring system and method based on double-loop intelligent electric energy meter |
| CN111711179A (en) * | 2020-06-02 | 2020-09-25 | 国网浙江省电力有限公司电力科学研究院 | Relay protection method suitable for short-circuit current exceeding scene |
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| CN111711179B (en) * | 2020-06-02 | 2022-10-14 | 国网浙江省电力有限公司电力科学研究院 | Relay protection method suitable for short-circuit current exceeding scene |
| CN111711176B (en) * | 2020-06-02 | 2022-10-14 | 国网浙江省电力有限公司电力科学研究院 | Station domain protection method suitable for short-circuit current exceeding scene |
| CN112749920A (en) * | 2021-01-29 | 2021-05-04 | 南方电网科学研究院有限责任公司 | Non-failure region power supply recovery method, device, equipment and storage medium |
| CN114362141A (en) * | 2021-12-03 | 2022-04-15 | 国网北京市电力公司 | Power supply system load recovery method combining heuristic algorithm and particle swarm optimization |
| CN114362141B (en) * | 2021-12-03 | 2023-10-31 | 国网北京市电力公司 | Power supply system load recovery method combining heuristic algorithm and particle swarm optimization |
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