CN110460072A - Consider the real-time Management strategy of low-voltage platform area three-phase imbalance problem of phase index - Google Patents
Consider the real-time Management strategy of low-voltage platform area three-phase imbalance problem of phase index Download PDFInfo
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- CN110460072A CN110460072A CN201910775877.0A CN201910775877A CN110460072A CN 110460072 A CN110460072 A CN 110460072A CN 201910775877 A CN201910775877 A CN 201910775877A CN 110460072 A CN110460072 A CN 110460072A
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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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The invention discloses a kind of real-time Management strategies of low-voltage platform area three-phase imbalance problem for considering phase index: in low-voltage platform area, using 3~5 family low-voltage customers as 1 load branch circuit of the on-line automatic commutation device of low-voltage load, the load branch circuit for installing automatic phase-change switch is 10~20, every load branch circuit one automatic phase-change switch of series connection；The objective function of optimal commutation strategy is set；The current information of each branch is collected by current sensor；A certain period of time is set and executes commutation operation, or i.e. progress commutation when comprehensive tri-phase unbalance factor crosses certain limit；When commutation, objective function is solved using genetic algorithm, obtains the corresponding commutation operation of optimal solution；In order to adapt to multiobjective optimization commutation, using vector basis because of coding strategy.Present invention can apply to the real-time improvement that coal changes low pressure resident three-phase imbalance problem under electric background.
Description
Technical field
The present invention relates to power quality fields, and more specifically, it relates to a kind of low-voltage platform areas three for considering phase index
The real-time Management strategy of phase imbalance problem.
Background technique
Three-phase imbalance refers to that three-phase current in the power system or voltage magnitude or phase are inconsistent, and inconsistent degree
The case where more than prescribed limit.As coal changes the continuous propulsion of electrical engineering, using air source heat pump as a large amount of high-power lists of representative
Phase electric heating load enters domestic consumer, causes the distribution of three-phase load in three phase and four wire circuit system uneven, makes distribution
The transformer moment is in threephase load off-center operation state.Three-phase imbalance problem will increase the electric energy damage of distribution transformer
Consumption increases the electric energy loss in transmission line, influences the use quality of electrical equipment, reduce motor efficiency.
The control algolithm for carrying out three-phase imbalance improvement using compensation device is complex, and equipment investment is higher.It uses
Automatic phase-change switch device can at lower cost administer low-voltage platform area three-phase imbalance problem in real time.And installation is certainly
Dynamic commutation device solve the problems, such as city net, effect is obvious in rural power grids three-phase imbalance.Previous research is also to automatic phase-change switch
Controlling terminal analyzed, propose uneven using the method for solving and power distribution station three-phase load of gene genetic optimization algorithm
The real-time online that weighs administers control strategy.But objective function is not clear enough, and does not consider the phase index of three-phase current.
When only considering three-phase current amplitude index, the calculating of three-phase current unbalance degree has the following two kinds.
The phase index that two kinds of calculation methods have ignored three-phase current influences three-phase imbalance problem bring, is one
The evaluation method of kind tri-phase unbalance factor, can be used to estimate three-phase current unbalance degree in the underdeveloped area of measurement system.And
When calculating three-phase imbalance problem by the method, if each phase current phase of two groups of three-phase currents of same amplitude is different,
It is influenced caused by power grid also different.Therefore, the tri-phase unbalance factor only determined by three-phase current amplitude index is not accurate enough.
With the continuous popularization and application of power electronic technique, intelligent power grid technology, measurement system is gradually flourishing, can more accurately calculate
Tri-phase unbalance factor.By symmetrical component method it is found that any one group of asymmetry phasor A, B, C can be decomposed into different three of phase sequence
Group phasor, phase change of variable are as follows:
Wherein,Respectively positive sequence, negative phase-sequence, the zero-sequence component of electric current, α=ej2pi/3.Negative phase-sequence and zero sequence are uneven
Weighing apparatus can affect to power grid and equipment.Negative-sequence current can mainly cause the additional fever and vibration of rotating electric machine,
Make the reduction of its efficiency, insulation ag(e)ing process is accelerated；Zero-sequence current can make neutral point be subjected to displacement, and three-phase voltage asymmetry occur
Power quality problem, influence the use quality of electrical equipment, increase the electric energy loss in transformer and transmission line.Work as three-phase
When known to the amplitude and phase of electric current, three-phase current unbalance degree can be calculated by formula (4) (5).
Wherein ε1For negative phase-sequence current unbalance factor, ε0For zero-sequence current degree of unbalancedness.
Summary of the invention
Purpose of the invention is to overcome the shortcomings in the prior art, proposes a kind of low-voltage platform area for considering phase index
The real-time Management strategy of three-phase imbalance problem fills the on-line automatic commutation of partial branch installation low-voltage load in low-voltage platform area
It sets, by certain branch commutations of heavily loaded phase to other phases, mitigates three-phase imbalance problem.Three-phase current is considered in objective function
Phase index, so that operation is more accurate rationally.
The purpose of the present invention is what is be achieved through the following technical solutions.
The real-time Management strategy of low-voltage platform area three-phase imbalance problem of present invention consideration phase index, comprising the following steps:
Step 1: in low-voltage platform area, using 3~5 family low-voltage customers as 1 of the on-line automatic commutation device of low-voltage load
Load branch circuit, the load branch circuit for installing automatic phase-change switch is 10~20, and every load branch circuit one automatic commutation of series connection is opened
It closes；
If being configured with the automatic phase-change switch of n platform altogether, the branch current for flowing through i-th automatic phase-change switch isIts phase is the phase when branch voltage crosses at 0；Each load branch circuit electric current of line end forms one
Current vector:
The switching situation of automatic phase-change switch is corresponding with 3 binary codings or three dimensional vectors；Automatic phase-change switch
Phase sequence state column vector kiAre as follows:
Phase sequence state matrix K before and after commutation0, K is respectively as follows:
K=[k1,k2,k3...,kn]
Then ignore voltage-phase offset, is reference with A phase voltage phase, flows through line end A, B, C three-phase before and after commutation
Electric current are as follows:
Step 2: the objective function of optimal commutation strategy is arranged, 2 kinds are shared, selects one of use；
(a) platform area three-phase current unbalance degree is minimum
If A, B, C phase total current that low-voltage platform area does not install three-phase imbalance device route are respectively Electricity
Positive and negative, the zero-sequence component of stream are as follows:
Define comprehensive tri-phase unbalance factor:
Wherein, λ1、λ2Concrete condition according to rack is chosen, λ1、λ2Take 1；Then:
That is objective function；
(b) comprehensively consider the automatic phase-change switch adjustment number and comprehensive three-phase in the on-line automatic commutation device of low-voltage load
Current unbalance factor
The action frequency that m is automatic phase-change switch is defined, comprehensive tri-phase unbalance factor and master switch number are assigned certain
Weight, objective function are as follows:
Wherein, λ3、λ4For comprehensive tri-phase unbalance factor and the corresponding weight of total commutation number；
Step 3: collecting the current information of each branch by current sensor；
Step 4: setting a certain period of time executes commutation operation, or comprehensive tri-phase unbalance factor crosses a fixed limit
Commutation is carried out when spending；When commutation, objective function is solved using genetic algorithm, obtains the corresponding commutation operation of optimal solution
(K matrix)；In order to adapt to multiobjective optimization commutation, using vector basis because of coding strategy；
(a) vector basis is because of coding strategy
In column vector k, automatic phase-change switch is closed into which phase in A, B, C three-phase, this mutually just marks 1, remaining phase
Mark 0；It is to switch phase sequence state matrix K that all automatic phase-change switch switching states, which combine corresponding chromosome,；
(b) genetic algorithm
1. crossover operator
Using parents' Shuangzi single point crossing, 1 breakpoint is randomly choosed on chromosome, right section of breakpoint is intercoursed,
To form 2 new offsprings；
2. mutation operator
Each gene can be in [1 0 0]T、[0 1 0]T、[0 0 1]TIt makes a variation between this 3 gene vectors；Installation is automatic
The load branch circuit of phase-change switch is 10, and general aberration rate value is 0.001~0.1.
Compared with prior art, the beneficial effects brought by the technical solution of the present invention are as follows:
Using automatic phase-change switch device, low-voltage platform area three-phase imbalance problem can be carried out at lower cost real-time
It administers.Consider the phase factor of three-phase current, propose the synthesis tri-phase unbalance factor index for considering negative-sequence current and zero-sequence current,
It establishes to integrate minimum tri-phase unbalance factor and consideration synthesis tri-phase unbalance factor and commutation number as the two of objective function
Kind mathematical model, the first objective function can utmostly administer platform area three-phase imbalance problem, and second of objective function is being controlled
Higher economy can be realized while managing three-phase imbalance problem.
Detailed description of the invention
Fig. 1 is the on-line automatic commutation circuit schematic diagram of low-voltage load；
Fig. 2 is that certain coal changes electric rural power distribution platform area line end current diagram.
Specific embodiment
The invention will be further described with reference to the accompanying drawing.
The real-time Management strategy of low-voltage platform area three-phase imbalance problem of present invention consideration phase index, comprising the following steps:
Step 1: power distribution station low-voltage customer scale is generally 200 families or so in low-voltage platform area.With 3~5 family low pressure
1 load branch circuit of the user as the on-line automatic commutation device of low-voltage load, the on-line automatic commutation device low pressure of low-voltage load are used
The coverage rate at family is 30%.The load branch circuit for installing automatic phase-change switch is about 10~20, and every load branch circuit is connected one
Automatic phase-change switch.Low-voltage platform area circuit is as shown in Figure 1.
Automatic phase-change switch can switch load after the instruction for being connected to control system sending between ABC phase.If matching altogether
It is equipped with the automatic phase-change switch of n platform, the branch current for flowing through i-th automatic phase-change switch isIts phase is should
Branch voltage crosses phase at 0.Each load branch circuit electric current of line end can form a current vector:
The switching situation of automatic phase-change switch is corresponding with 3 binary codings or three dimensional vectors.Automatic phase-change switch
Phase sequence state column vector kiAre as follows:
Phase sequence state matrix K before and after commutation0, K is respectively as follows:
K=[k1,k2,k3...,kn] (9)
Then ignore voltage-phase offset, is reference with A phase voltage phase, flows through line end A, B, C three-phase before and after commutation
Electric current are as follows:
Step 2: the objective function of optimal commutation strategy is arranged, 2 kinds are shared, one of use may be selected
(a) platform area three-phase current unbalance degree is minimum
If A, B, C phase total current that low-voltage platform area does not install three-phase imbalance device route are respectively Electricity
Positive and negative, the zero-sequence component of stream are as follows:
(4) ε in (5)1And ε0It can reflect three-phase current unbalance problem from negative-sequence current and zero-sequence current respectively.
But it is comprehensive to be applied alone (4) or (5) to carry out characterization shortage to three-phase current unbalance degree.To consider that negative phase-sequence and zero-sequence current are asked comprehensively
Topic defines comprehensive tri-phase unbalance factor:
Wherein, λ1、λ2It can be chosen according to the concrete condition of rack.As on the neutral conductor impedance it is bigger than normal if zero-sequence current pair
Voltage unbalance is affected, λ2Value bigger than normal may be selected.λ herein1、λ2Take 1.Then formula (13) may be expressed as:
That is objective function.
(b) comprehensively consider the automatic phase-change switch adjustment number and comprehensive three-phase in the on-line automatic commutation device of low-voltage load
Current unbalance factor
The action frequency that m is automatic phase-change switch is defined, comprehensive tri-phase unbalance factor and master switch number are assigned certain
Weight, objective function are as follows:
Wherein, λ3、λ4For comprehensive tri-phase unbalance factor and the corresponding weight of total commutation number.
Step 3: collecting the current information of each branch by current sensor.
Step 4: setting a certain period of time executes commutation operation, or comprehensive tri-phase unbalance factor crosses a fixed limit
Commutation is carried out when spending；When commutation, objective function is solved using genetic algorithm, obtains the corresponding commutation operation of optimal solution
(K matrix)；In order to adapt to multiobjective optimization commutation, using vector basis because of coding strategy.
(a) vector basis is because of coding strategy
In column vector k, automatic phase-change switch is closed into which phase in A, B, C three-phase, this mutually just marks 1, remaining phase
Mark 0；It is to switch phase sequence state matrix K that all automatic phase-change switch switching states, which combine corresponding chromosome,.
(b) genetic algorithm
1. crossover operator
Using parents' Shuangzi single point crossing, 1 breakpoint is randomly choosed on chromosome, right section of breakpoint is intercoursed,
To form 2 new offsprings.
2. mutation operator
Each gene can be in [1 0 0]T、[0 1 0]T、[0 0 1]TIt makes a variation between this 3 gene vectors.Installation is automatic
The load branch circuit of phase-change switch is about more than 10 items, and general aberration rate value is 0.001~0.1.
Embodiment:
It is as shown in Figure 2 that certain moment coal changes electric rural power distribution platform area line end electric current.12 single-phase branch of line end
Road is mounted with automatic phase-change switch.
A, B, C phase do not install three-phase imbalance device circuit total current be (300-j160) A, (220-j180) A,
(330-j140) A, current phase are the phase when branch voltage crosses at 0, then are reference with A phase voltage phase, A, B, C phase are not
The total current of the route of three-phase imbalance device is installed are as follows:
Line end branch current vector are as follows:
Before commutation, the following institute of the corresponding switch state matrix of each load branch circuit of the on-line automatic commutation device of low-voltage load
Show:
According to the load branch circuit number of the on-line automatic commutation device of low-voltage load, the number of iterations of genetic algorithm is set as 100 times,
Population number is 100, aberration rate 0.01.It is computed, before automatic commutation device movement, current three-phase degree of unbalancedness is 20.18%.
(a) objective function is that platform area three-phase current unbalance degree is minimum.
After commutation, low-voltage platform area tri-phase unbalance factor is reduced to 6.29%.Switch state matrix after corresponding commutation are as follows:
As it can be seen that this strategy has clear improvement for low-voltage platform area three-phase imbalance problem.
(b) comprehensively consider the on-line automatic commutation device switch adjustment number of low-voltage load and comprehensive three-phase current unbalance degree
Enable λ3=1, λ4=1%, then objective function f=ε1+0.01ε2, obtaining objective function after being solved with genetic algorithm is
0.1265, synthesis tri-phase unbalance factor at this time is 10.65%, and regulation effect is still obvious.Switch shape after corresponding commutation
State matrix are as follows:
Full court area phase-change switch executes 2 commutations operation altogether.Compared with the control result of objective function 1, this strategy execution
Total commutation number is reduced afterwards, and it is unobvious to integrate tri-phase unbalance factor increase.Comprehensively consider three-phase current unbalance and total
Number is adjusted, it can be achieved that higher economy.
Although above in conjunction with attached drawing, invention has been described, the invention is not limited to above-mentioned, of the invention
Under enlightenment, many forms can be also made, all of these belong to the protection of the present invention.
Claims (1)
1. it is a kind of consider phase index the real-time Management strategy of low-voltage platform area three-phase imbalance problem, which is characterized in that including with
Lower step:
Step 1: in low-voltage platform area, using 3~5 family low-voltage customers as 1 load of the on-line automatic commutation device of low-voltage load
Branch, the load branch circuit for installing automatic phase-change switch is 10~20, every load branch circuit one automatic phase-change switch of series connection；
If being configured with the automatic phase-change switch of n platform altogether, the branch current for flowing through i-th automatic phase-change switch is
Its phase is the phase when branch voltage crosses at 0；Each load branch circuit electric current of line end forms a current vector:
The switching situation of automatic phase-change switch is corresponding with 3 binary codings or three dimensional vectors；Automatic phase-change switch phase sequence
State column vector kiAre as follows:
Phase sequence state matrix K before and after commutation0, K is respectively as follows:
K=[k1,k2,k3...,kn]
Then ignore voltage-phase offset, is reference with A phase voltage phase, the electricity of line end A, B, C three-phase is flowed through before and after commutation
Stream are as follows:
Step 2: the objective function of optimal commutation strategy is arranged, 2 kinds are shared, selects one of use；
(a) platform area three-phase current unbalance degree is minimum
If A, B, C phase total current that low-voltage platform area does not install three-phase imbalance device route are respectively Electric current
Positive and negative, zero-sequence component are as follows:
Define comprehensive tri-phase unbalance factor:
Wherein, λ1、λ2Concrete condition according to rack is chosen, λ1、λ2Take 1；Then:
That is objective function；
(b) comprehensively consider the automatic phase-change switch adjustment number and comprehensive three-phase current in the on-line automatic commutation device of low-voltage load
Degree of unbalancedness
The action frequency that m is automatic phase-change switch is defined, assigns certain weight to comprehensive tri-phase unbalance factor and master switch number,
Objective function are as follows:
Wherein, λ3、λ4For comprehensive tri-phase unbalance factor and the corresponding weight of total commutation number；
Step 3: collecting the current information of each branch by current sensor；
Step 4: setting a certain period of time executes commutation operation, or when comprehensive tri-phase unbalance factor crosses certain limit
Carry out commutation；When commutation, objective function is solved using genetic algorithm, obtains corresponding commutation operation (the K square of optimal solution
Battle array)；In order to adapt to multiobjective optimization commutation, using vector basis because of coding strategy；
(a) vector basis is because of coding strategy
In column vector k, automatic phase-change switch is closed into which phase in A, B, C three-phase, this mutually just marks 1, remaining mutually marks 0；
It is to switch phase sequence state matrix K that all automatic phase-change switch switching states, which combine corresponding chromosome,；
(b) genetic algorithm
1. crossover operator
Using parents' Shuangzi single point crossing, 1 breakpoint is randomly choosed on chromosome, right section of breakpoint is intercoursed, thus
Form 2 new offsprings；
2. mutation operator
Each gene can be in [1 0 0]T、[0 1 0]T、[0 0 1]TIt makes a variation between this 3 gene vectors；Automatic commutation is installed
The load branch circuit of switch is 10, and general aberration rate value is 0.001~0.1.
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| CN111478345A (en) * | 2020-04-13 | 2020-07-31 | 山东建筑大学 | Intelligent phase change switch configuration method and system for low-voltage power distribution system |
| CN112510726A (en) * | 2020-11-18 | 2021-03-16 | 国网河北省电力有限公司 | Three-phase load unbalance management method for distribution transformer |
| CN112701700A (en) * | 2020-12-24 | 2021-04-23 | 广东电网有限责任公司计量中心 | Multi-objective optimization-based three-phase imbalance management method and system for transformer area |
| CN113206507A (en) * | 2021-05-13 | 2021-08-03 | 乐清工程师创新服务中心 | Three-phase load unbalance edge side treatment method and system |
| CN114977224A (en) * | 2022-05-06 | 2022-08-30 | 三峡大学 | Three-phase unbalance time-sharing treatment method considering distributed power supply access residential area |
| CN115378001A (en) * | 2022-10-25 | 2022-11-22 | 南昌科晨电力试验研究有限公司 | Low-voltage distribution network artificial phase modulation method and system based on load periodicity |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111478345A (en) * | 2020-04-13 | 2020-07-31 | 山东建筑大学 | Intelligent phase change switch configuration method and system for low-voltage power distribution system |
| CN112510726A (en) * | 2020-11-18 | 2021-03-16 | 国网河北省电力有限公司 | Three-phase load unbalance management method for distribution transformer |
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| CN113206507B (en) * | 2021-05-13 | 2022-05-27 | 乐清长三角电气工程师创新中心 | Three-phase load unbalance edge side treatment method and system |
| CN114977224A (en) * | 2022-05-06 | 2022-08-30 | 三峡大学 | Three-phase unbalance time-sharing treatment method considering distributed power supply access residential area |
| CN114977224B (en) * | 2022-05-06 | 2024-04-19 | 三峡大学 | Three-phase imbalance time-period treatment method considering distributed power supply access residential area |
| CN115378001A (en) * | 2022-10-25 | 2022-11-22 | 南昌科晨电力试验研究有限公司 | Low-voltage distribution network artificial phase modulation method and system based on load periodicity |
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Application publication date: 20191115 |