CN104659797A - Intelligent power load three-phase unbalance handling method at distribution network low voltage side - Google Patents

Intelligent power load three-phase unbalance handling method at distribution network low voltage side Download PDF

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CN104659797A
CN104659797A CN201510069424.8A CN201510069424A CN104659797A CN 104659797 A CN104659797 A CN 104659797A CN 201510069424 A CN201510069424 A CN 201510069424A CN 104659797 A CN104659797 A CN 104659797A
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load
phase
commutation
pressure side
unbalance
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CN104659797B (en
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卢松
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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
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)

Abstract

The invention discloses an intelligent power load three-phase unbalance handling method at a distribution network low voltage side. The method includes a system which consists of type B commutation terminals capable of self-balancing at apartments, a host and type A commutation terminals. The system achieves the purpose that the degree of unbalancedness of the three-phase load at the distribution network low voltage side reaches a minimum value at any moment through switching the user actual usage load to a phase with relatively light load; the system not only can autonomously solve the overall three-phase balance problem at a distribution transformer side, but also can solve the local three-phase balance problem at apartments.

Description

A kind of method that distribution low-pressure side intelligent electric power load three-phase imbalance is administered
Technical field
The present invention relates to a kind of method that distribution low-pressure side intelligent electric power load three-phase imbalance is administered, especially urban distribution network low-pressure side electric load three-phase imbalance is administered.The product be made into by this method belongs to energy-conservation, the safety product of electric and electronic technical field.
Background technology
In electric power system, the consumption of electric energy mainly relies on distribution to realize, and especially relies on distribution low-pressure side to realize.In China, low voltage electric load, typically refer to alternating current 220V/380V system with load.Alternating current 220V/380V system is made up of three-phase and four-line usually, i.e. A phase, B phase, C phase, N phase (zero line), and the load of its tape splicing almost includes all kinds of modern household electrical appliances and factory's electricity consumption, agricultural irrigation.
Obviously, the load of distribution low-pressure side tape splicing may comprise single-phase load and three-phase load.For three phase electric machine load, when normally running, three-phase is in poised state.Concerning residential electricity consumption, its load is nearly all single-phase.Because resident load is normally drawn from step down side with cable.When installer installs, be difficult to know and enter the separate of resident, more do not know character and the size of which family's load.In other words, although be the size knowing all domestic consumer's loads, but due to the seasonality of electricity consumption, period and diversity factor, be bound to cause the size of three-phase load unpredictable, be also namely very easy to cause three-phase load unbalance.Fact proved, local at some, unbalance factor is a little up to more than 80%, and can say that low-voltage power system three-phase load absolute equilibrium is perfect condition, imbalance is normality.
Three-phase load unbalance, the first harm brought to electric power system is that line loss increases, square being directly proportional of the numerical value that line loss increases and electric current.
Suppose that the three-phase load resistance of certain distribution transforming is equal and equal R, in poised state, the line loss Δ P=I of this distribution transforming 2r, and Δ P a=Δ P b=Δ P c.Three-phase total line loss ∑ Δ P=3I 2r.
When system is in non-equilibrium state, suppose that A phase load is zero, and B, C two-phase on average shares the electric current of A phase, then line loss Δ P a=0, Δ P b=(1.5I) 2r=2.25I 2r, Δ P c=(1.5I) 2r=2.25I 2r, ∑ Δ P=4.5I 2r, line loss recruitment is: 4.5I 2r-3I 2r=1.5I 2r, also namely line loss adds 50%.Be not difficult to calculate, if three-phase institute on-load is by a phase tape splicing, ∑ Δ P=(31) now 2r=9I 2r.Line loss recruitment is: 9I 2r-3I 2r=6I 2r, 3 times when line loss is poised state, also namely line loss adds 200%.
In fact, the phenomenon that the circuit that we see usually is burned with anger, major part is that this circuit overload causes.For electric power system, add breakdown repair number of times, add O&M cost, reduce power supply reliability.
Three-phase load unbalance, the second largest harm brought to electric power system is that transformer produces additional iron losses.Network distribution transformer many employings three-iron core column structure of Y/Yo wiring, when generation three-phase load unbalance or when there is earth fault, its primary side non-zero-sequence current exists, secondary side has zero-sequence current to exist, therefore the zero-sequence current of secondary side is exciting current completely, but the zero sequence fluxes produced can not close in iron core, need be closed by oil tank wall, thus heating produces iron loss in the annexes such as iron case.
Three-phase load unbalance, the third-largest harm brought to electric power system produces additional copper loss.
Three-phase load unbalance, the fourth-largest harm brought to electric power system produces variation, can cause producing imbalance of three-phase voltage, affect the service capacity even motor damage of threephase motor time serious.
Current, electric power system is in order to solve three-phase imbalance problem, and conventional way is that Load adjustment is removed at residential electricity consumption scene of sending someone.But regrettably, three-phase load unbalance is a kind of dynamic process, and it can change at any time, and the way by artificial Load adjustment can only solve temporary transient problem, and must not solve root problem.Take a lot of work, time-consuming, produce little effect.
The present invention is absorbed in a kind of method that distribution low-pressure side electric load three-phase imbalance is administered, and especially urban distribution network low-pressure side electric load three-phase imbalance is administered, and concrete governing system is separately shown in utility model patent.
Summary of the invention
In the residential quarter in city, the network topological diagram of distribution low-pressure side is shown in accompanying drawing 1.
Net low-pressure side load produces unbalanced first approach:
The place having three-phase and four-line to lead to unit building is also the imbalance at unit building place.Suppose that A, B, C number of users that three-phase is with is the same, and electric power is identical, if three-phase electricity consumption, at this moment Ia=Ib=Ic simultaneously, its degree of unbalance Iun=[(Imax-Imin)/Imax] × 100%=0, this is optimal situation;
But reality is, each user can not simultaneously electricity consumption and power is equal, at this moment will inevitably dynamically occur Ia ≠ Ib ≠ Ic, and its degree of unbalance can by formula Iun=[(Imax-Imin)/Imax] × 100% to obtain.As can be seen from formula, when Imax and Imin difference more hour, degree of unbalance Iun is less.
In order to make degree of unbalance reach minimum at any time, should according to current three-phase load situation, the electricity consumption adjusting this cell mesh user is at any time separate.
System topological figure of the present invention is shown in Figure of description.
A type commutation terminal (12) described in native system is a kind of device only with N number of interchangeable phase load having short distance wireless data communication.
Type B commutation terminal (6) described in native system is a kind of not only with N number of interchangeable phase load but also the device with M firm demand.
In the present system, according to the size of distribution transforming (1) capacity, some Type B commutation terminals (6) are installed.Type B commutation terminal (6) can the user (7) of commutation with partial fixing electricity consumption user (8) and part.During normal operation, Type B commutation terminal (6) is by detecting the size of current transformer (5) three-phase current, and record the separate of Imax (maximum current) and Imin (minimum current) place, simultaneously by formula Iun=[(Imax-Imin)/Imax] × 100% calculate current degree of unbalance.Namely when Iun is greater than certain set point, when also degree of unbalance exceedes setting, immediately respectively can the size of commutation user (7) load by detecting that current transformer (6) detects, and record is deposited.
Suppose this TV station Type B commutation terminal (6) with N number of can commutation user (7), and detect current have F can commutation user (7) Imax place mutually on run (F≤N), at this moment program cycle performs Iunx=[(Imax-IMx) (Imin+IMx)/(Imax-IMx)] × 100%, F Iun value can be calculated, can find out simultaneously produce Iun minimum value can commutation user (7), also be namely aware of and currently commutation user (7) should can be switched to going up mutually of Imin which ran in Imax phase, this Type B commutation terminal carries out this operation immediately, make current degree of unbalance Imin minimum.
After degree of unbalance Iun exceedes setting, several situation may be had to occur.
Although 1 have found the separate of Imax place, do not have 1 can commutation user (7) Imax occur mutually on run, now do not carry out commutation operation;
Although 2 have found the separate of Imax place, but only have 1 can commutation user (7) run mutually at this, and the load switching ability that this customer charge can be born beyond phase-change switch (steady state run current of load phase-change switch is normally greater than load switching electric current), now do not carry out commutation operation;
3, after carrying out commutation operation, new Iun ' >=Iun, does not now carry out commutation operation.
Unit building place generation three-phase load unbalance problem can be solved according to the Type B load commutation terminal that above-mentioned principle is formed, namely can at any time the degree of unbalance that this place occurs be accomplished minimum.
Net low-pressure side load produces unbalanced second approach:
In the distribution in city, although the ammeter of most of user is all install concentratedly at unit building, the performance of a lot of power consumption equipment is also had not concentrate.As: the junior unit building, communal facility, the corridor road lamp that are less than 4 families, road lighting etc.Their wiring is random often, and this brings imbalance also to undoubtedly the operation of distribution transforming (1).
For this situation, administering method of the present invention is: install (3) 1, main frame in systems in which, and several A type loads commutation terminal (12).
Described terminal (12) is for gathering this end loads size and uploading to main frame (3), perform the device of main frame (3) transmitting order to lower levels.
Described main frame (3), for each phase total load of real time monitoring distribution transforming (1), Real-time Collection A type commutation terminal (12) power consumption information, how decision-making redistributes load if going out, make load unbalanced degree remain at device in acceptability limit.
System Working Principle is as follows:
On main frame, the size of this distribution transforming of Real-time Collection (1) each phase current (total current), voltage, by formula:
Δ S=Ia × Ua+Ib × Ub+Ic × Uc, calculates the total capacity of current use.In formula, Ia, Ib, Ic are the total current that distribution transforming (1) exports, and Ua, Ub, Uc are the terminal voltage that distribution transforming (1) exports.
As Δ S < S 0during × K, (S 0for the capacity of transformer, K is coefficient.Current this value of Δ S is without national regulations, allow various places according to the actual conditions scene setting of oneself, the span of K is 0-1), then do not consider to calculate degree of unbalance, reason is that current use capacity is little, be not enough to produce the safe and stable operation of distribution transforming (1) threaten, and total line loss is little.
As Δ S>=S 0during × K, then press formula Iun=[(Imax-Imin)/Imax] × 100% calculating degree of unbalance.
In formula, Imax is the maximum current in three-phase current, and Imin is the minimum current in three-phase current), Iun is the current unbalance factor calculated in real time.
When Iun>=K1 (current degree of unbalance limits without GB, and allow various places according to the actual conditions scene setting of oneself, the span of K1 is 0-1), and Δ S>=S 0during × K, namely think that system is in non-equilibrium state, should load adjustment be carried out.Now, main frame (3) sends the short-distance wireless communication (9) of data acquisition command to each A type commutation terminal (12) by short-distance wireless (2), gather the current load data of each A type commutation terminal (12) one by one and store, until complete for the data acquisition of all for native system A type commutations terminal (12).
Current A type commutation number of terminals (12) number run in Imax phase added up by main frame (3), and by formula Iunx=[(Imax-IMx)-(Imin+IMx)/(Imax-IMx)] × 100% calculate M (M≤N) Iun, and then minimum Iun can be found out, main frame (3) sends the order of " please be switched to Imin phase " immediately to A type commutation terminal (12) producing minimum Iun.
The same, after degree of unbalance Iun exceedes setting and current use capacity is greater than certain setting, several situation may be had to occur.
Although 4 have found the separate of Imax place, do not have 1 A type commutation terminal (12) Imax occur mutually on run, now do not carry out commutation operation;
Although 5 have found the separate of Imax place, but only have 1 A type commutation terminal (12) to run mutually at this, and the load switching ability that this customer charge can be born beyond phase-change switch (steady state run current of load phase-change switch is normally greater than load switching electric current), now do not carry out commutation operation;
6, after carrying out commutation operation, new Iun ' >=Iun, does not now carry out commutation operation
7, the load unbalanced governing system of distribution low-pressure side intelligent three-phase of the present invention, the Type B commutation terminal being included in unit building place energy self-balancing and the system be made up of main frame and A type commutation terminal.Native system is by switching user's actual load to lighter the going up mutually of load, realizing the object that distribution low-pressure side three-phase load unbalance degree reaches minimum value at any time.Independently can solve the overall three-phase equilibrium problem of station power distribution transformer terminal, unit building local three-phase equilibrium problem can be solved again simultaneously.

Claims (5)

1. the method that distribution low-pressure side intelligent electric power load three-phase imbalance is administered, is characterized in that, described system is made up of a main frame and some A type load commutation terminals being arranged on distribution low-pressure side and some Type B load commutation terminals.
2. the method for a kind of distribution low-pressure side intelligent electric power load three-phase imbalance improvement according to claim 1, it is characterized in that, the load variations of described several unit buildings of system energy real-time tracking and distribution transforming, real-time intelligent independently judges, at any time the sub-load of heavy load phase is switched to going up mutually of light load, makes current unbalance factor remain at minimum state.
3. the method for a kind of distribution low-pressure side intelligent electric power load three-phase imbalance improvement according to claim 1, it is characterized in that, described system have employed formula Iun=[(Imax-Imin)/Imax] × 100% to follow the tracks of the degree of unbalance of computing system, and once-through operation just can make current degree of unbalance reach minimum.
4. the method for a kind of distribution low-pressure side intelligent electric power load three-phase imbalance improvement according to claim 1, is characterized in that, have employed short distance wireless data mechanics of communication to gather the data of each terminal, without operating cost, good and cheap.
5. the method for a kind of distribution low-pressure side intelligent electric power load three-phase imbalance improvement according to claim 1, it is characterized in that, both Type B commutation terminal can have been adopted separately to carry out the load in balancing unit building, main frame can be adopted separately again to add A type commutation terminal to balance the load of distribution transforming system or both are used in combination.
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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105117986A (en) * 2015-09-25 2015-12-02 国网湖北节能服务有限公司 Low voltage network line loss calculating method considering the imbalance degree
CN105515025A (en) * 2015-12-23 2016-04-20 国网甘肃省电力公司金昌供电公司 Three-phase unbalance optimization method for low-voltage power distribution network
CN105552939A (en) * 2016-03-07 2016-05-04 山东电工电气集团新能科技有限公司 Three-phase unbalance governance system and method
CN105591396A (en) * 2016-02-29 2016-05-18 国家电网公司 Low-voltage distribution line distribution transformer three-phase unbalance protection method and device
CN105633985A (en) * 2015-12-25 2016-06-01 国家电网公司 Intelligent balance adjusting method for three-phase load unbalance
CN105870945A (en) * 2016-05-30 2016-08-17 广西星宇智能电气有限公司 Three-phase current imbalance automatic regulation algorithm for low-voltage power distribution network
CN106130045A (en) * 2016-08-24 2016-11-16 国网天津宝坻供电有限公司 A kind of method of regulating platform district three-phase load unbalance
CN106816883A (en) * 2017-03-06 2017-06-09 天津平高智能电气有限公司 Three-phase imbalance regulating system parallel connection input coefficient, control method and device
CN106849137A (en) * 2017-04-07 2017-06-13 武汉大学 A kind of three-phase imbalance adjusting method for reducing via net loss
CN106887856A (en) * 2017-03-06 2017-06-23 天津平高智能电气有限公司 Three-phase imbalance adjustment control method, device and three-phase imbalance regulating system
CN107591813A (en) * 2017-08-08 2018-01-16 陈鸽 A kind of power termination access distribution network method and load-balancing method
CN108649592A (en) * 2018-06-07 2018-10-12 安徽南瑞中天电力电子有限公司 A kind of multi-functional automatic commutation system of mid ＆ low-voltage line and its phase change method
CN112865144A (en) * 2021-04-09 2021-05-28 广东电网有限责任公司广州供电局 Three-phase load unbalance adjusting method and device and distribution transformer side monitoring equipment
CN113452043A (en) * 2021-08-30 2021-09-28 广东电网有限责任公司湛江供电局 Method, device, equipment and medium for governing three-phase unbalance of transformer area

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CN103337867A (en) * 2013-06-28 2013-10-02 国家电网公司 Low voltage load online phase modulation device and phase modulation method thereof
CN103545826A (en) * 2012-07-09 2014-01-29 江西龙跃电子科技有限公司 Intelligent low-voltage power load distribution system and method

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CN102751733A (en) * 2012-06-26 2012-10-24 中国电力科学研究院 On-line three-phase load unbalance processing method suitable for low-voltage distribution network
CN103545826A (en) * 2012-07-09 2014-01-29 江西龙跃电子科技有限公司 Intelligent low-voltage power load distribution system and method
CN103337867A (en) * 2013-06-28 2013-10-02 国家电网公司 Low voltage load online phase modulation device and phase modulation method thereof

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105117986A (en) * 2015-09-25 2015-12-02 国网湖北节能服务有限公司 Low voltage network line loss calculating method considering the imbalance degree
CN105515025A (en) * 2015-12-23 2016-04-20 国网甘肃省电力公司金昌供电公司 Three-phase unbalance optimization method for low-voltage power distribution network
CN105515025B (en) * 2015-12-23 2018-10-16 国网甘肃省电力公司金昌供电公司 A kind of three-phase imbalance optimization method of low-voltage network
CN105633985B (en) * 2015-12-25 2018-05-22 国家电网公司 Three-phase load unbalance intelligent balance adjusting method
CN105633985A (en) * 2015-12-25 2016-06-01 国家电网公司 Intelligent balance adjusting method for three-phase load unbalance
CN105591396A (en) * 2016-02-29 2016-05-18 国家电网公司 Low-voltage distribution line distribution transformer three-phase unbalance protection method and device
CN105591396B (en) * 2016-02-29 2018-06-26 国家电网公司 The three-phase imbalance guard method of the distribution transformer of low-voltage distributing line and device
CN105552939A (en) * 2016-03-07 2016-05-04 山东电工电气集团新能科技有限公司 Three-phase unbalance governance system and method
CN105870945A (en) * 2016-05-30 2016-08-17 广西星宇智能电气有限公司 Three-phase current imbalance automatic regulation algorithm for low-voltage power distribution network
CN105870945B (en) * 2016-05-30 2018-08-24 广西星宇智能电气有限公司 A kind of three-phase current unbalance for low-voltage network automatically adjusts algorithm
CN106130045A (en) * 2016-08-24 2016-11-16 国网天津宝坻供电有限公司 A kind of method of regulating platform district three-phase load unbalance
CN106887856B (en) * 2017-03-06 2020-06-09 天津平高智能电气有限公司 Three-phase unbalance adjustment control method and device and three-phase unbalance adjustment system
CN106887856A (en) * 2017-03-06 2017-06-23 天津平高智能电气有限公司 Three-phase imbalance adjustment control method, device and three-phase imbalance regulating system
CN106816883A (en) * 2017-03-06 2017-06-09 天津平高智能电气有限公司 Three-phase imbalance regulating system parallel connection input coefficient, control method and device
CN106849137A (en) * 2017-04-07 2017-06-13 武汉大学 A kind of three-phase imbalance adjusting method for reducing via net loss
CN107591813B (en) * 2017-08-08 2021-09-24 广西电网有限责任公司 Power load access power distribution network method and load balancing method
CN107591813A (en) * 2017-08-08 2018-01-16 陈鸽 A kind of power termination access distribution network method and load-balancing method
CN111276985A (en) * 2018-06-07 2020-06-12 安徽南瑞中天电力电子有限公司 Multifunctional automatic phase changing system and method for medium and low voltage line
CN111130130A (en) * 2018-06-07 2020-05-08 安徽南瑞中天电力电子有限公司 Multifunctional automatic phase changing system and method for medium and low voltage line
CN111130129A (en) * 2018-06-07 2020-05-08 安徽南瑞中天电力电子有限公司 Multifunctional automatic phase-changing system for medium and low voltage line
CN111130130B (en) * 2018-06-07 2021-02-12 安徽南瑞中天电力电子有限公司 Multifunctional automatic phase changing system and method for medium and low voltage line
CN111130129B (en) * 2018-06-07 2021-03-02 安徽南瑞中天电力电子有限公司 Multifunctional automatic phase-changing system for medium and low voltage line
CN111276985B (en) * 2018-06-07 2021-05-14 安徽南瑞中天电力电子有限公司 Multifunctional automatic phase changing system and method for medium and low voltage line
CN108649592A (en) * 2018-06-07 2018-10-12 安徽南瑞中天电力电子有限公司 A kind of multi-functional automatic commutation system of mid ＆ low-voltage line and its phase change method
CN112865144A (en) * 2021-04-09 2021-05-28 广东电网有限责任公司广州供电局 Three-phase load unbalance adjusting method and device and distribution transformer side monitoring equipment
CN113452043A (en) * 2021-08-30 2021-09-28 广东电网有限责任公司湛江供电局 Method, device, equipment and medium for governing three-phase unbalance of transformer area
CN113452043B (en) * 2021-08-30 2022-01-11 广东电网有限责任公司湛江供电局 Method, device, equipment and medium for governing three-phase unbalance of transformer area

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