CN104578066B - Automatic low-voltage power distribution network reconstruction operation method based on bisection difference value grouping search method - Google Patents
Automatic low-voltage power distribution network reconstruction operation method based on bisection difference value grouping search method Download PDFInfo
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Abstract
The invention relates to an automatic low-voltage power distribution network reconstruction operation method based on a bisection difference value grouping search method. The automatic low-voltage power distribution network reconstruction operation method includes (1), judging whether loads of two inlet wires are equal or not, and if not, redistributing the loads; the step (1) specifically includes 1), performing bisection method search to acquire a load or a combination of multiple loads to form a switching load, and 2), switching the selected switching load to enable the same to be connected to another inlet wire, and completing load redistribution. The automatic low-voltage power distribution network reconstruction operation method has the advantages that line losses caused by nonuniformity in distributed loads of double power sources are reduced, existing electric power computer networks are utilized effectively, load distribution is analyzed accurately, rapidly, comprehensively in real-time, online automatic reconstruction of a low-voltage power distribution network is realized, quality of electric energy is improved greatly, economic operation of the power distribution network is promoted greatly through operation mode optimization, and both economic benefit and social benefit are huge.
Description
Technical field
The invention belongs to power system automation technology field, specifically discloses a kind of based on the low of equation of the equinoxes value comparison method
The method that press-fitting electrical network reconstructs operation automatically.
Background technology
Line loss refers to that electric energy is transferred to during power consumer from power plant, transmission of electricity, power transformation, distribution and sale etc. each
Produced electric energy loss and loss in the middle of link.Line loss in electrical network accounts for a suitable part for gross generation, so reducing
Line loss has important practical significance.Load balancing can reduce theory wire loss, and low-voltage network, will under conditions of multichannel inlet wire
Load is connected to different inlet wires, and load is adjusted, and the size of two inlet wire institute on-loads is adjusted, to reach two lines road
Institute's on-load is tried one's best balanced.
Distribution network automated is the external effective supplementary means for improving power distribution network safety in operation, but for low-voltage distribution
Net, domestic automation equipment application and imperfection is general, the automation equipment, automatic load for low-voltage network load adjustment
It is balanced that operation reserve is reconstructed simultaneously seldom with the low-voltage network for reducing line loss automatically.Therefore, by automation equipment and using conjunction
Suitable load balancing strategy, the reality need to reducing line loss has suitable Practical significance.
The content of the invention
It is an object of the invention to provide it is a kind of can automatically implement low-voltage network load balancing, to reduce line loss
Method.
To reach above-mentioned purpose, the technical solution used in the present invention is：
A kind of low-voltage network based on equation of the equinoxes to packet search method reconstructs operation method automatically, is applied to have double electricity
Source inlet wire and every inlet wire connects in the low-voltage network of several loads, described method includes：
(1) bearing power sum P that two inlet wires are connected is calculated respectivelyA=∑ Ai、PB=∑ Bj, wherein, AiFor one
The power of the load that inlet wire is connected, i=1,2 ..., n, BjThe power of the load connected by another inlet wire, j=1,
2 ..., m, and the load that every inlet wire is connected is according to power two sequences of ascending order arrangement form：SA：PA1,
PA2..., PAnAnd SB：PB1, PB2..., PBm；
(2) bearing power sum P of two inlet wires is calculatedA、PBDifference halfJudge Δ P≤min
{min(Ai),min(Bj) or Δ P≤ε whether set up, wherein, ε be minimum operation load value, if then load balancing, if otherwise
Carry out load to redistribute；
1. bearing power sum P for selecting two inlet wires to be connectedA、PBIn higher value corresponding to inlet wire connected
The power sequence of load is used as switching object sequence Sobj, in switching object sequence SobjIn carry out dichotomizing search, obtain power
The combination of one load or multiple loads of most proximity Δ P forms switchable load；
2. selected switchable load is switched over so as to be connected to another inlet wire, complete load and redistribute.
Step 1. in, if Δ P be less than or equal to described switching object sequence SobjIn minimum of a value, then with described throwing
Cut object sequence SobjIn minimum of a value corresponding to load as switchable load；If Δ P is more than described switching object sequence
SobjIn minimum of a value, then obtain sequence S：
Wherein, Pc+1It is more than or equal to Δ P and closest to the load value of Δ P, PcIt is less than Δ P and closest to the negative of Δ P
Charge values；
Select Pc+1And PcIn closest to Δ P load be to be switched load PIt is undetermined, the load in sequence S is combined,
Judge the load sum of each combination compared with PIt is undeterminedWhether closer to Δ P, if so, then using the combination as to be switched load PIt is undetermined。
Sequence S is averagely divided into m groups, per group is Si, it is S per the element in groupI, 1, SI, 2..., SI, k-1, SI, k, wherein k
It is and the S per the load number in groupI, 1＜ SI, 2＜ ... ＜ SI, k-1＜ SI, k, the load number for including is allowed in setting combination
Count, searches for element and constitutes combination, wherein 1≤d≤count in the d packet in m component groups.
Setting in combination allows the maximum of load number count for including as 4, until count by count=1
=4, judge the load sum for combining compared with P respectivelyIt is undeterminedWhether closer to Δ P.
Exclusion is not required to after the packet for considering search for element composition combination in the packet not excluded again.
If search obtains multiple combinations can become switchable load, the minimum combination of load number is selected as switching
Load.
Because above-mentioned technical proposal is used, the present invention has compared with prior art following advantages：The method of the present invention drops
It is low to effectively utilize existing power system calculation machine network because dual power supply distributes the load line loss that inequality is caused, realize accurately, it is fast
The fast, distribution of analysis load in real time comprehensively, realizes that online low-voltage network is reconstructed automatically, substantially improves the quality of power supply, runs
The optimization of mode is greatly facilitated the economical operation of power distribution network, and either economic benefit or social benefit are all very huge.
Description of the drawings
Accompanying drawing 1 is the structure chart of power distribution network.
Specific embodiment
Below in conjunction with the accompanying drawings the invention will be further described for shown embodiment.
Embodiment one：Power distribution network as shown in Figure 1 includes 1# inlet wires and 2# inlet wires amount to two inlet wires, forms dual power supply
Inlet wire, it passes through intelligence and turns to connect several loads for switching device, and each load can be connected on two inlet wires.Its
In, the connection for being just used for control load and inlet wire for switching device can be turned so as to different inlet wires can be connected to according to required.
Intelligence turns possess communication module, load measurement module, on off state control module for switching device, by information on load and can bear
The status information of the connected switch of lotus uploads to main website side, and main website sends distribution, the instruction of switching load turns to supply switching to intelligence
Device, Jing after intelligently turning to carry out signal transacting for switching device, performs switching instruction.Intelligence turn can be realized short for switching device
Temporary loop-net operation, when switchable load is needed, if load is currently powered by first inlet wire, first enters the load and Article 2
The switch of line closes, and realization is powered by two inlet wires to it, subsequently disconnects the switch of load and first inlet wire, realizes load
The non-transfer that has a power failure.
Said system reconstructs operation method, the method automatically in order to realize load balancing using following low-voltage network
Realized based on equation of the equinoxes value packet search method.Method is specific as follows：
Step 1：Bearing power sum P that two inlet wires are connected is calculated respectivelyA=∑ Ai、PB=∑ Bj, wherein, AiFor one
The power of the load that bar inlet wire is connected, i=1,2 ..., n, BjThe power of the load connected by another inlet wire, j=1,
2 ..., m, and the load that every inlet wire is connected is according to power two sequences of ascending order arrangement form：SA：PA1,
PA2..., PAnAnd SB：PB1, PB2..., PBm。
Step 2：Calculate bearing power sum P of two inlet wiresA、PBDifference halfThen judge
ΔP≤min{min(Ai),min(Bj) or Δ P≤ε whether set up, wherein, ε be minimum operation load value.If then load is equal
Weighing apparatus, without the need for carrying out redistributing for load；If otherwise carrying out load to redistribute, that is, the load for finding optimum is needed to be adjusted
It is whole, i.e., a part of load is shifted from the heavier inlet wire of on-load and is transferred on the less inlet wire of on-load so that both institute's bands
Load try one's best equilibrium.
The process that load is redistributed is as follows：
1. bearing power sum P for selecting two inlet wires to be connectedA、PBIn higher value (for example, PA) corresponding to enter
The power sequence of the load that line is connected is used as switching object sequence Sobj, in switching object sequence SobjIn carry out dichotomy and search
Rope, the combination for obtaining a load or multiple loads of power most proximity Δ P forms switchable load.
Here several situations, Yi Zhongshi are included：Δ P is less than or equal to switching object sequence SobjIn minimum of a value, it is another kind of
It is that Δ P is more than switching object sequence SobjIn minimum of a value.In the first scenario, Δ P is less than or equal to switching object sequence
SobjIn minimum of a value, then with switching object sequence SobjIn minimum of a value corresponding to load as switchable load.At second
In the case of, Δ P is more than switching object sequence SobjIn minimum of a value, then obtain sequence S：
Wherein, Pc+1It is more than or equal to Δ P and closest to the load value of Δ P, PcIt is less than Δ P and closest to the negative of Δ P
Charge values.
P is selected firstc+1And PcIn closest to Δ P load be to be switched load PIt is undetermined, group is carried out to the load in sequence S
Close, then travel through switching object sequence SobjIn the load combination to be formed, judge the load sum of each combination compared with PIt is undetermined
Whether closer to Δ P, if so, then using the combination as to be switched load PIt is undetermined。
Specifically can be achieved in that：Sequence S is averagely divided into m groups, m depends on the circumstances according to Δ P, per group is Si, often
Element in group is SI, 1, SI, 2..., SI, k-1, SI, k, wherein k is per the load number in group, usual k >=6, and SI, 1＜ SI, 2
＜ ... ＜ SI, k-1＜ SI, k, four Smaller load values S before middle storage are met per groupi,1、Si,2、Si,3、Si,4, four big load values afterwards
Si,k-3、Si,k-2、Si,k-1、Si,kTo array T, if load number is less than 8 in each packet, can store front 2 Smaller loads, latter 2
Or front 3 Smaller loads or rear 3 big loads.Load number count for including is allowed in setting combination, it is assumed that bag is allowed in combination
The maximum of load number count for containing is 4, you can the number of load can be included with the combination for considering as 1 or 2 or 3 or
4.Element is searched in d (1≤d≤count) individual packet in m component groups and constitutes combination, until count by count=1
=4, judge the load sum for combining compared with P respectivelyIt is undeterminedWhether closer to Δ P.During judgement, the combination sum of count load is obtained
Psum,countIf, | Psum,count- Δ P | ＜ | PIt is undetermined- Δ P |, will | Psum,count- Δ P | and combined information is stored in PtemlistIn, change
The value of count, repeat the above steps, until count=4, in PtemlistIn owned | Psum,count- Δ P | ＜ | PIt is undetermined-ΔP
| combination.If PtemlistIn have value, then travel through | Psum,count- Δ P | value, select minimum | Psum,count- Δ P | value is corresponding
Load is combined as switchable load, if existing, multigroup combination is identical with Δ P degrees of closeness, i.e. search obtains multiple combinations and can
Become switchable load, then select combination in load number it is few, i.e., switching manipulation least number of times as switchable load, if combination in
Load number is also identical, then can randomly choose one group of load and combine as switchable load；If PtemlistFor sky, then PIt is undeterminedFor switching
Load.The value of switchable load is added into less sequence (such as S of total load valueB) in after, then judge whether two inlet wires balance.
In search combination, can first exclude and be not required to after the packet of consideration search for element composition in the packet not excluded again
Combination.Criterion is：If big value max sum, the minimum between k packet group in the total load value of various count load combinations most
Value min sum, meets max sum ＜ PnOr min sum ＞ Pn+1, then be not required to will this d packet carry out between group load combination and search
Rope：
During d=1, to the packet S for needing to judgei, max sum are SiIn after the big load of count load value sum, min
Sum is SiIn front count Smaller load load value sum；
During d=2, to the packet S for needing to judgei、Sj(i ＜ j), max sum are SjIn after the big load of count-1 and Si
The summation of middle peak load, min sum are SjMiddle minimum load and SiIn front count-1 Smaller loads summation；
During d=3, to the packet S for needing to judgei、Sj、Sk(i ＜ j ＜ k), if count=3, min be sum=Si,1+Sj,1+
Sk,1, max sum=Si,k+Sj,k+Sk,k；If count=4, min be sum=Si,1+Sj,1+Sk,1+Sk,2, max sum=Si,k+
Si,k-1+Sj,k+Sk,k；
K=d, count=4, to the packet S for needing to judgei、Sj、Sk、Sl(i ＜ j ＜ k ＜ l), max sum=Si,k+Sj,k
+Sk,k+Sl,k, min sum=Si,1+Sj,1+Sk,1+Sl,1；
2. turn in order to switch over selected switchable load for switching device by intelligence so as to be connected to another
Bar inlet wire, completes load and redistributes.
Above-described embodiment technology design only to illustrate the invention and feature, its object is to allow person skilled in the art
Scholar will appreciate that present disclosure and implement according to this, can not be limited the scope of the invention with this.It is all according to the present invention
Equivalence changes or modification that Spirit Essence is made, all should be included within the scope of the present invention.
Claims (6)
1. a kind of low-voltage network based on equation of the equinoxes value packet search method reconstructs operation method automatically, is applied to dual power supply
Inlet wire and every inlet wire connects in the low-voltage network of several loads, it is characterised in that：Described method includes：
(1) bearing power sum P that two inlet wires are connected is calculated respectivelyA=∑ Ai、PB=∑ Bj, wherein, AiFor an inlet wire
The power of the load for being connected, i=1,2 ..., n, BjThe power of the load connected by another inlet wire, j=1,2 ..., m,
And the load for being connected every inlet wire is according to power two sequences of ascending order arrangement form：SA：PA1, PA2..., PAn
And SB：PB1, PB2..., PBm；
(2) bearing power sum P of two inlet wires is calculatedA、PBDifference halfJudge Δ P≤min { min
(Ai),min(Bj) or Δ P≤ε whether set up, wherein, ε be minimum operation load value, if then load balancing, if otherwise carrying out
Load is redistributed；
1. bearing power sum P for selecting two inlet wires to be connectedA、PBIn higher value corresponding to the load that connected of inlet wire
Power sequence as switching object sequence Sobj, in switching object sequence SobjIn carry out dichotomizing search, obtain power and most connect
The combination of one load or multiple loads of nearly Δ P forms switchable load；
2. selected switchable load is switched over so as to be connected to another inlet wire, complete load and redistribute.
2. the low-voltage network based on equation of the equinoxes value packet search method according to claim 1 reconstructs operation method automatically,
It is characterized in that：Step 1. in, if Δ P be less than or equal to described switching object sequence SobjIn minimum of a value, then with described
Switching object sequence SobjIn minimum of a value corresponding to load as switchable load；If Δ P is more than described switching object sequence
SobjIn minimum of a value, then obtain sequence S：
Wherein, Pc+1It is more than or equal to Δ P and closest to the load value of Δ P, PcIt is less than Δ P and closest to the load value of Δ P；
Select Pc+1And PcIn closest to Δ P load be to be switched load PIt is undetermined, the load in sequence S is combined, judge each
The load sum of combination is compared with PIt is undeterminedWhether closer to Δ P, if so, then using the combination as to be switched load PIt is undetermined。
3. the low-voltage network based on equation of the equinoxes value packet search method according to claim 2 reconstructs operation method automatically,
It is characterized in that：Sequence S is averagely divided into m groups, per group is Si, it is S per the element in groupI, 1, SI, 2..., SI, k-1, SI, k, its
Middle k is and the S per the load number in groupI, 1＜ SI, 2＜ ... ＜ SI, k-1＜ SI, k, the load number for including is allowed in setting combination
Count, searches for element and constitutes combination, wherein 1≤d≤count in the d packet in m component groups.
4. the low-voltage network based on equation of the equinoxes value packet search method according to claim 3 reconstructs operation method automatically,
It is characterized in that：Set combination in allow the maximum of load number count for including as 4, by count=1 up to
Count=4, judges respectively the load sum for combining compared with PIt is undeterminedWhether closer to Δ P.
5. the low-voltage network based on equation of the equinoxes value packet search method according to claim 3 reconstructs operation method automatically,
It is characterized in that：Exclusion is not required to after the packet for considering search for element composition combination in the packet not excluded again.
6. the low-voltage network based on equation of the equinoxes value packet search method according to claim 1 reconstructs operation method automatically,
It is characterized in that：If search obtains multiple combinations can become switchable load, the combination conduct for selecting load number minimum
Switchable load.
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| CN110347204B (en) * | 2019-07-17 | 2020-06-26 | 石家庄通合电子科技股份有限公司 | Contactor control algorithm for power distribution of annular bus |
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| JP5311894B2 (en) * | 2008-06-24 | 2013-10-09 | 中国電力株式会社 | Voltage management method for distribution system, tap selection method for transformer |
| WO2010103348A1 (en) * | 2009-03-09 | 2010-09-16 | Abb Technology Ltd | System and method for real-time feeder reconfiguration for load balancing in distribution system automation |
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