CN103414173B - 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, it is related to power distribution network
Fault recovery, a kind of specifically distribution network failure restoration methods based on ultra-short term.
Background technology
With the raising of China's power distribution automation level, this just recovers to provide many-sided data and skill for distribution network failure
The support of art, also puts forward higher requirement to the rapidity of recovery process, safety, reliability meanwhile.Power distribution network once goes out
Existing fault, substantial amounts of information is sent to main station system at short notice, how these information is used for distribution network failure recovery and is
One good problem to study.
Distribution network failure recovers to need to consider balance between power supply and load, tributary capacity limits, network keeps spoke
Penetrate the composite factors such as shape requirement, switching manipulation cost and network loss, therefore fault recovery be a complicated multiple target, non-linear,
The combinatorial optimization problem of multiple constraint.Chinese scholars propose a lot of methods and solve this problem, are broadly divided into three classes: tradition is excellent
Change algorithm, heuritic approach and intelligent algorithm.Intelligent algorithm has obtained extensive research with its particular advantages, such as Liu
Jasmine etc. (Liu Li, Chen Xueyun. the Distribution Networks Reconfiguration [j] based on fuzzy genetic algorithm. Proceedings of the CSEE, 2000,20
(2): the 66-69.) fuzzy genetic algorithm proposing, carries out fuzzy control to crossing-over rate and aberration rate, is effectively improved convergence speed
Degree, it is to avoid premature convergence；Lu Zhi just wait (Lu Zhigang, Dong Xiangyu. based on improve binary particle swarm algorithm power distribution network therefore
Barrier recovers [j]. Automation of Electric Systems, 2006,30(24): 39-43.) introduce analytic hierarchy process (AHP) when determining object function
Solve the weight of each index, and fault recovery problem is solved using improved binary particle swarm algorithm.But, current distribution
Net fault recovery method is all to carry out Load flow calculation using the load value of fault time section, draws fault recovery scheme accordingly.
But distribution network load changes at any time, in a period of time to before failture evacuation after Fault Isolation, load variations may
Some electrical equipment overloads or power supply quality is led to decline.Therefore, traditional fault recovery is difficult to meet to load fluctuation relatively
Big power distribution network carries out the demand of fault recovery.
Content of the invention
The invention aims to overcoming conventional electrical distribution net fault recovery method to carry out tide using the load value before fault
Stream calculation and capacity verification, and the recovery scheme that drawn possibly cannot adapt to field failure zone isolation to after fix a breakdown simultaneously
Load variations in the time of net, lead to some electrical equipments overload or shortcoming that power supply quality declines is it is proposed that a kind of base
Distribution network failure restoration methods in ultra-short term.
Before introducing technical scheme, the technical term appeared in the present invention is described as follows:
1st, fault zone: there is the region that there occurs the equipment such as bus, distribution line or the transformator of permanent fault,
Normal power supply cannot be carried out to the load being connected with faulty equipment before failover；
2nd, non-faulting dead electricity area: refer to be affected by other fault zones and cause power failure, and there is not fault in this region
Region；
3rd, normal power supply region: the power supply area outside fault zone and non-faulting dead electricity area；
4th, interconnection switch: the normal open switch in contact non-faulting dead electricity area and normal power supply area；
5th, block switch: two ends are all in the normally closed switch in non-faulting dead electricity area or normal power supply area；
6th, Level 1 support feeder line: the feeder line being joined directly together by interconnection switch and power supply interrupted district, connect Level 1 support feeder line
Become one-level interconnection switch with the interconnection switch in power failure area；
7th, interconnection switch spare capacity: in the whole electrical equipments between interconnection switch to the power supply powered for it, specified electricity
The minima of stream and actual current difference is referred to as the maximum spare capacity of this interconnection switch；
8th, the transferable loading of block switch: block switch can be to the loading of certain interconnection switch transfer, i.e. this segmentation
The load total amount of switch downstream, referred to as block switch are directed to the transferable loading of this interconnection switch；
The application specifically employs the following technical solutions:
The present invention provide a kind of distribution network failure restoration methods based on ultra-short term it is characterised in that, institute
The method of stating comprises the steps:
(1) to power distribution network, all load buses carry out ultra-short term；
(2) the calculated load data base in prediction period is built according to predicted load；
(3) fault recovery flow process is executed according to calculated load data base, draw fault recovery switching manipulation result, carry out event
Barrier recovery operation.
The application still further preferably technical scheme below:
Described based in the distribution network failure restoration methods of ultra-short term, in described step (1), to distribution
All load buses of net carry out ultra-short term, and described ultra-short term refers to predict following 5-120 minute
Load, chooses prediction period according to the time grid-connected to after fix a breakdown from field failure zone isolation, obtains in prediction period
Load prediction curve.
Described based in the distribution network failure restoration methods of ultra-short term, in described step (2), according to each
The ultra-short term result of individual node, the maximum that each node load is predicted the outcome is as the calculated load of this node
Value, constructs calculated load data base.
Described based in the distribution network failure restoration methods of ultra-short term, in described step (3), in event
In barrier recovery algorithms, used load data is the load data in the calculated load data base obtaining in step (2), here
On the basis of distribution network failure recover step as follows:
A (), according to the result of Fault Isolation, draws power distribution network normal power supply region, fault zone and non-faulting dead electricity area
Domain, and calculate the dead electricity total amount in non-faulting dead electricity area.
B () finds out all interconnection switches being connected with non-faulting dead electricity region, and calculate normal power supply region and non-event
The spare capacity of all interconnection switches that barrier dead electricity area is connected, and carry out descending arrangement by the size of spare capacity；
C () finds out the interconnection switch that all spare capacities are more than the dead electricity total amount in non-faulting dead electricity area, if not getting in touch with out
The dead electricity total amount that the spare capacity closed is more than non-faulting dead electricity area then goes to step (d)；If having, interconnection switch is individually closed successively
Close and carry non-faulting dead electricity region carry out Load flow calculation to turn, check whether to occur voltage or the out-of-limit electrical equipment of electric current,
If not having out-of-limit equipment, the switching manipulation result that interconnection switch is individually closed successively is feasible, if out-of-limit equipment occurs, will
The switching manipulation result that interconnection switch individually closes successively is infeasible, goes to step (d)；
D () finds out the interconnection switch pair that all spare capacity sums are more than the dead electricity total amount in non-faulting dead electricity area, if not depositing
The interconnection switch of dead electricity total amount being more than non-faulting dead electricity area in spare capacity sum is to then going to step (e)；If there is standby appearance
Amount sum be more than non-faulting dead electricity area dead electricity total amount interconnection switch pair, then respectively by interconnection switch to closure, simultaneously by this
Block switch on two interconnection switch paths is individually opened and is carried out Load flow calculation, checks whether voltage or electricity occur
Flowing out-of-limit electrical equipment, if there is no out-of-limit electrical equipment, interconnection switch being feasible side to the switching manipulation result of closure
Case；If out-of-limit equipment occurs, go to step (e)；
E () cutting load, any two interconnection switch is closed, simultaneously by the block switch on this two interconnection switch paths
Individually open and find out the out-of-limit interconnection switch of capacity, this interconnection switch is carried out range time for starting point to block switch
Go through search and draw breadth traversal search sequence, the order from back to front of block switch in the sequence is opened successively carry out cutting negative
Lotus, until interconnection switch no longer capacity is out-of-limit, then carries out the electrical equipment that Load flow calculation checks whether to occur voltage out-of-limit, if
First segmentation searching from out-of-limit electrical equipment then opened to interconnection switch direction by the electrical equipment that there is voltage out-of-limit
Switch, until after not having the electrical equipment of voltage out-of-limit, this barrier is recovered switching manipulation result as feasible program；
F () selects optimum fault recovery switching manipulation result, in above-mentioned each feasible fault recovery switching manipulation result
The minimum fault recovery switching manipulation result of dead electricity load is selected to be optimal case；If dead electricity load is the same, selecting switch is grasped
Making the little fault recovery switching manipulation result of number of times is optimal case；If dead electricity load is all the same with switching manipulation number of times, select
The fault recovery switching manipulation result selecting loss minimization is optimal case, carries out the fault recovery behaviour of power distribution network according to optimal case
Make.
The invention has the beneficial effects as follows:
A kind of distribution network failure restoration methods based on ultra-short term disclosed by the invention, using super short period load
Predicting Technique predicts the distribution network load situation of following a period of time, according to the ultra-short term result of each node,
The maximum that each node load is predicted the outcome is as the calculated load value of this node, and then draws fault recovery scheme.Gram
Taken conventional electrical distribution net fault recovery method using the load value before fault moment carry out Load flow calculation and capacity verification, institute
The load variations that the recovery scheme drawing possibly cannot adapt in the field failure zone isolation grid-connected time to after fix a breakdown,
Not only make some electrical equipment overloads and then lead to outlet breaker tripping operation or lead to non-faulting element that potential safety hazard occurs,
Also the shortcoming having had a strong impact on power supply quality.
Brief description
Fig. 1 is the flow chart of the present invention；
Fig. 2 is the test circuit simplification figure that distribution network failure recovers；
Fig. 3 is the load prediction curve in test circuit load bus 5 prediction period.
Specific embodiment
With reference to Figure of description and specific embodiment, the technical scheme of the application is described in further detail.
It is the distribution network failure restoration methods flow process based on ultra-short term disclosed by the invention as shown in Figure 1
Figure.Power distribution network phantom as shown in Figure 2, this system nominal voltage is 10kv, containing 8 interconnection switch equipment, bears for 10
Lotus node, 4 power supply nodes.It is exactly electrical network institute when being occurred according to fault that distribution network failure based on ultra-short term recovers
The running status at place, carries out ultra-short term to distribution network load node, according to load prediction results, power distribution network is carried out
Fault recovery, thus ensure that fail-over policy can adapt to distribution network load fluctuation.The present invention specifically comprises the following steps that
(1) ultra-short term is carried out to all load buses.According to actual load situation, select ultra-short term suitable
Load forecasting method, such as linear extrapolation, neural network, method of support vector machine etc., load bus 1-10 is surpassed
Short-term load forecasting, obtains the load prediction curve of each load bus 9:00-10:00.
(2) the calculated load data base in prediction period is built according to predicted load.Take out the node in prediction period
The maximum of load as calculated load value, the such as load prediction curve of node 5 as shown in figure 3, then its calculated load value be
71+32.29kva, show that the calculated load of each load bus builds calculated load data base.
(3) fault recovery flow process is executed according to calculated load data base, draw fault recovery switching manipulation scheme, carry out event
Barrier recovery operation.
Described based in the distribution network failure restoration methods of ultra-short term, in described step (3), in event
In barrier recovery algorithms, used load data is the load data in the calculated load data base obtaining in step (2), here
On the basis of distribution network failure recover step as follows:
A (), according to the result of Fault Isolation, draws power distribution network normal power supply region, fault zone and non-faulting dead electricity area
Domain, and calculate the dead electricity total amount in non-faulting dead electricity area.
B () finds out all interconnection switches being connected with non-faulting dead electricity region, and calculate normal power supply region and non-event
The spare capacity of all interconnection switches that barrier dead electricity area is connected, and carry out descending arrangement by the size of spare capacity；
C () finds out the interconnection switch that all spare capacities are more than the dead electricity total amount in non-faulting dead electricity area, if not getting in touch with out
The dead electricity total amount that the spare capacity closed is more than non-faulting dead electricity area then goes to step (d)；If having, interconnection switch is individually closed successively
Close and carry non-faulting dead electricity region carry out Load flow calculation to turn, check whether to occur voltage or the out-of-limit electrical equipment of electric current,
If not having out-of-limit equipment, if out-of-limit equipment, by interconnection switch in the concept feasible that interconnection switch is individually closed successively
Individually the scheme of closure is infeasible successively, goes to step (d)；
D () finds out the interconnection switch pair that all spare capacity sums are more than the dead electricity total amount in non-faulting dead electricity area, if not depositing
The interconnection switch of dead electricity total amount being more than non-faulting dead electricity area in spare capacity sum is to then going to step (e)；If there is standby appearance
Amount sum be more than non-faulting dead electricity area dead electricity total amount interconnection switch pair, then respectively by interconnection switch to closure, simultaneously by this
Block switch on two interconnection switch paths is individually opened and is carried out Load flow calculation, checks whether voltage or electricity occur
Flowing out-of-limit electrical equipment, if there is no out-of-limit equipment, interconnection switch being feasible program to the scheme of closure；If occurring out-of-limit
Equipment then goes to step (e)；
E () cutting load, any two interconnection switch is closed, simultaneously by the block switch on this two interconnection switch paths
Individually open and find out the out-of-limit interconnection switch of capacity, this interconnection switch is carried out range time for starting point to block switch
Go through search and draw breadth traversal search sequence, the order from back to front of block switch in the sequence is opened successively carry out cutting negative
Lotus, until interconnection switch no longer capacity is out-of-limit, then carries out the electrical equipment that Load flow calculation checks whether to occur voltage out-of-limit, if
There is voltage out-of-limit and then open first block switch searching to interconnection switch direction from out-of-limit element, until there is no voltage
After out-of-limit, this barrier is recovered switching manipulation scheme as feasible program；
F () is chosen the best alternatives, select the minimum scheme of dead electricity load to be optimal case in above-mentioned each feasible program；If
When dead electricity load is the same, then the little scheme of selecting switch number of operations is optimal case；If dead electricity load and switching manipulation number of times are all
Equally, then the scheme selecting loss minimization is optimal case, carries out the failure recovery operation of power distribution network according to optimal case.
With reference to following examples, step (3) is described in detail.
Example 1:
A () bus 5 breaks down, switch s4 and s7 opens fault section isolation.According to the result of Fault Isolation, draw
Distribution network failure region is [5], non-faulting dead electricity region [9], remaining is normal power supply region, and calculates non-faulting dead electricity area
Dead electricity total amount be i=78a.
(b) find out all interconnection switches being connected with non-faulting dead electricity region be s8, and calculate normal power supply region with
The spare capacity of all interconnection switches that non-faulting dead electricity area is connected is is8=169a；
C interconnection switch that () spare capacity is more than the dead electricity total amount in non-faulting dead electricity area is s8；Interconnection switch s8 is closed
To turn band non-faulting dead electricity region and to carry out Load flow calculation, then the program is feasible program not to have out-of-limit equipment；
D () feasible program only has closure interconnection switch s8, so the program is optimal case；
Example 2:
A () bus 1 breaks down, switch s1 opens isolated fault region, according to the result of Fault Isolation, draws power distribution network
Fault zone is [1], non-faulting dead electricity region [2347], remaining is normal power supply region, and calculates non-faulting dead electricity area
Dead electricity total amount is i=178a.
B () finds out all interconnection switches being connected with non-faulting dead electricity region is s3, s6, and calculates normal power supply region
The spare capacity of all interconnection switches being connected with non-faulting dead electricity area is simultaneously arranged as i from big to smalls6=158a、is3=69a；
C () does not have the dead electricity total amount that the spare capacity of interconnection switch is more than non-faulting dead electricity area then to go to step (d)；
(d) find out all spare capacity sums be more than non-faulting dead electricity area dead electricity total amount interconnection switch to for
[s3s6]；Then interconnection switch s3, s6 are closed, block switch s2 opens and carries out Load flow calculation, does not have the out-of-limit equipment then party
Case is feasible program；Interconnection switch s3, s6 are closed, block switch s5 opens and carry out Load flow calculation, interconnection switch s3 occurs
Electric current is out-of-limit, then give up the program；
E () feasible program only has interconnection switch s3, s6 to close, block switch s2 opens, so the program is optimal case；
Finally it should be noted that: only illustrate that technical scheme is not intended to limit with reference to above-described embodiment.Institute
The technical staff in genus field is to be understood that: those skilled in the art the specific embodiment of the present invention can be modified or
Person's equivalent, but these modifications or change are all being applied among pending claims.
Claims (2)
1. a kind of distribution network failure restoration methods based on ultra-short term it is characterised in that, methods described includes as follows
Step:
(1) to power distribution network, all load buses carry out ultra-short term；
(2) the calculated load data base in prediction period is built according to predicted load: according to the super short period load of each node
Predict the outcome, the maximum that each node load is predicted the outcome, as the calculated load value of this node, constructs calculated load
Data base；
(3) fault recovery flow process is executed according to calculated load data base, draw fault recovery switching manipulation result, carry out fault extensive
Multiple operation:
A (), according to the result of Fault Isolation, draws power distribution network normal power supply region, fault zone and non-faulting dead electricity region, and
Calculate the dead electricity total amount in non-faulting dead electricity area；
B () finds out all interconnection switches being connected with non-faulting dead electricity region, and calculate normal power supply region and non-faulting mistake
The spare capacity of all interconnection switches that electric area is connected, and carry out descending arrangement by the size of spare capacity；
C () finds out the interconnection switch that all spare capacities are more than the dead electricity total amount in non-faulting dead electricity area, if not having interconnection switch
The dead electricity total amount that spare capacity is more than non-faulting dead electricity area then goes to step (d)；If having, interconnection switch individually is closed successively
Turning band non-faulting dead electricity region carry out Load flow calculation, checking whether to occur voltage or the out-of-limit electrical equipment of electric current, if not having
There is the switching manipulation result that interconnection switch is then individually closed by out-of-limit equipment successively feasible, if out-of-limit equipment occurs, will get in touch with
The switching manipulation result that switch individually closes successively is infeasible, goes to step (d)；
D () finds out the interconnection switch pair that all spare capacity sums are more than the dead electricity total amount in non-faulting dead electricity area, if not existing standby
The interconnection switch of dead electricity total amount being more than non-faulting dead electricity area with capacity sum is to then going to step (e)；If exist spare capacity it
With the interconnection switch pair of the dead electricity total amount more than non-faulting dead electricity area, then respectively by interconnection switch to closure, simultaneously by this two
Block switch on interconnection switch path is individually opened and is carried out Load flow calculation, checks whether to occur that voltage or electric current are got over
Limit electrical equipment, if there is no out-of-limit electrical equipment, by interconnection switch to closure switching manipulation result be feasible program；
If out-of-limit equipment occurs, go to step (e)；
E () cutting load, any two interconnection switch is closed, respectively by the block switch on this two interconnection switch paths simultaneously
Individually open and find out the out-of-limit interconnection switch of capacity, this interconnection switch is carried out breadth traversal for starting point to block switch and searches
Rope draws breadth traversal search sequence, the order from back to front of block switch in the sequence is opened successively and carries out cutting load,
Until interconnection switch no longer capacity is out-of-limit, then carry out the electrical equipment that Load flow calculation checks whether to occur voltage out-of-limit, if depositing
Then open in the electrical equipment of voltage out-of-limit and open to first segmentation that interconnection switch direction searches from out-of-limit electrical equipment
Close, until after there is no the electrical equipment of voltage out-of-limit, using fault recovery switching manipulation result as feasible program；
F () selects optimum fault recovery switching manipulation result, select in above-mentioned each feasible fault recovery switching manipulation result
The minimum fault recovery switching manipulation result of dead electricity load is optimal case；If dead electricity load is the same, selecting switch operation time
The little fault recovery switching manipulation result of number is optimal case；If dead electricity load is all the same with switching manipulation number of times, select net
Damaging minimum fault recovery switching manipulation result is optimal case, carries out the failure recovery operation of power distribution network according to optimal case.
2. the distribution network failure restoration methods based on ultra-short term as claimed in claim 1, is characterized in that, described step
Suddenly in (1), ultra-short term is carried out to all load buses of power distribution network, described ultra-short term refers to prediction not
Carry out the load of 5-120 minute, prediction period is chosen according to the time grid-connected to after fix a breakdown from field failure zone isolation, obtains
Load prediction curve in prediction period.
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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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| 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 |
| 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 |
| 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 |
| CN106356847B (en) * | 2016-10-18 | 2019-03-19 | 国网江苏省电力公司电力科学研究院 | It is a kind of based on multifactor distribution network failure restoration methods |
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| 基于模糊识别和负荷特性的电力负荷超短期预测方法研究;张怡;《中国优秀硕士学位论文全文数据库工程科技Ⅱ辑》;20111215;全文 * |
| 电力系统超短期负荷预测技术的应用与发展;张怡等;《浙江电力》;20100228;第5-8、29页 * |
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