CN100352124C - Method for controlling, restraining and eliminating voltage network harmonic of transformer magnetic circuit - Google Patents
Method for controlling, restraining and eliminating voltage network harmonic of transformer magnetic circuit Download PDFInfo
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- CN100352124C CN100352124C CNB2005100402903A CN200510040290A CN100352124C CN 100352124 C CN100352124 C CN 100352124C CN B2005100402903 A CNB2005100402903 A CN B2005100402903A CN 200510040290 A CN200510040290 A CN 200510040290A CN 100352124 C CN100352124 C CN 100352124C
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- transformer
- harmonic
- harmonic wave
- control winding
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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
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The present invention provides a method for controlling, restraining and eliminating electric network harmonics of transformers, which belongs to the fields of electric power system harmonic treatment and electric power electronic technology. The method is formed in the way that a harmonic control winding is added on the basis of an original primary and an auxiliary side windings of the transformer, the load side of the transformer, namely, a line of a harmonic generating side, is connected in series with a current detector, the back of the current detector is connected with a harmonic separator, the output end of the harmonic separator is connected to both ends of each control winding of the transformer, a magnetic linkage generated by the control windings and a harmonic magnetic linkage generated at the load side of the transformer are counteracted because the magnetic linkages are the same in size and are opposite in direction so as to restrain and eliminate the harmonics by changing the connecting type of the control windings and designing the shunting coefficients of the current design current and the number of turns of the control windings. The method eliminate specific subharmonics or the harmonics in a certain frequency band range, and has characteristics of good tracking performance of load harmonics, simple device, less investment and good economical efficiency.
Description
Technical field
The invention belongs to Harmonious Waves in Power Systems and administer and electric and electronic technical field, be specifically related to the method that a kind of transformer magnetic circuit control suppresses and eliminate mains by harmonics.
Background technology
Along with a large amount of uses of modern power electronic device, the harmonic wave that power electronic equipment produces descends grid supply quality, forms the harmonic wave public hazards, and eliminating or suppressing harmonic wave is the important topic that improves power supply quality.At present domestic and international harmonic carcellation except that the harmonic wave that reduces power electronic equipment takes place, mainly uses the method for filtering, i.e. passive the and active filter of serial or parallel connection on the electrical network networking.The method of these harmonic carcellations is actually by changing circuit structure, and the passage that forms harmonic wave is shunted or suppressed harmonic current.This measure of taking on circuit structure concerning passive filter, can only be eliminated limited specific subharmonic; Concerning active filter, though can eliminate each harmonic in theory, but because active filter generally also is a power electronic equipment, itself also produces a certain amount of harmonic wave, when eliminating mains by harmonics, also can bring new harmonic problem, especially for uncertain harmonic wave, the difficulty of eliminating is very big, owing to the complexity of active power filtering technology, has also increased the difficulty of its promotion and application.At the deficiency that on the electrical network networking, connects passive and active filter harmonic carcellation method at present, the invention provides the method that a kind of transformer magnetic circuit control suppresses and eliminate mains by harmonics, on transformer, increase harmonic wave control winding, control by transformer magnetic circuit and suppress and harmonic carcellation.
Summary of the invention
Transformer is the important and essential equipment of electric power system, and it is connecting network system and custom system, and electric energy is carried by transformer, and has experienced the transfer process of electricity-magnetic-electricity in transformer.First-harmonic and harmonic current that the user load side produces, in transformer, all can produce corresponding first-harmonic and harmonic wave magnetic linkage component, the magnetic linkage that phase place is opposite if in transformer magnetic circuit, import identical with original magnetic linkage harmonic component size, then the result of two kinds of magnetic linkages stack is that to make the harmonic component in the transformer magnetic circuit be zero, therefore can the induced harmonics electric current on the former limit of transformer, realized the purpose of harmonic carcellation.It more than is basic principle of the present invention.
Method provided by the present invention is as follows: for single-phase transformer, see accompanying drawing 1, on original winding basis of transformer, increase harmonic wave control winding 4, it in the load-side of transformer series current detector 6 on the circuit of harmonic wave generation side, electric current detector 6 backs connect harmonic wave separation device 5, and the output of harmonic wave separation device 5 is received the two ends of transformer harmonic wave control winding 4.The load current that contains harmonic wave in the load-side of transformer by electric current detector 6 splitter sections, the electric current of shunting detects through harmonic wave separation device 5 wherein needs the harmonic component eliminated, the harmonic component that detects is inserted the harmonic wave control winding 4 of transformer, and by changing the connected mode (just connecing and reversal connection) of control winding, and the number of turn of the diverting coefficient of design current detector and harmonic wave control winding, the magnetic linkage that harmonic wave control winding is produced is opposite with the load harmonic wave magnetic linkage size equidirectional that transformer secondary winding produces, harmonic wave magnetic linkage summation is zero in the transformer magnetic circuit like this, thereby can in the inner magnetic circuit of transformer, suppress and harmonic carcellation, and in the electric current on the former limit of transformer, only can induce and the corresponding fundamental current of the fundametal compoment of load current (50HZ), eliminate of the influence of load harmonic wave thereby reach to electrical network.
To three-phase transformer, see accompanying drawing 2, need three harmonic wave control windings, one of every phase; The harmonious wave separator of electric current detector (6) (5) also needs every phase one cover, connects identical with single-phase transformer.
Electric current detector 6 harmonious wave separators 5 have two kinds of designs among the present invention:
1, electric current detector 6 makes Current Transformer, and harmonic wave separation device 5 adopts the Passive LC filter.Can eliminate the harmonic wave of specific subharmonic and certain bandwidth by the selection of LC parameter.
2, harmonic wave separation device 5 adopts active filter, and electric current detector 6 just detects the harmonic signal of transformer load electric current.Amplify by the active filter modulation, control imports the size and the harmonic components of the harmonic current of control winding 4.Design 2 imports the variation that the harmonic current of controlling winding can be followed the load harmonic wave well, obtains better harmonic suppression effect.
Characteristics of the present invention are: 1, in that to suppress on the principle of harmonic wave the method that connects filter (passive filtering or active power filtering) on the line with existing different, be to suppress and eliminate mains by harmonics by transformer magnetic circuit being applied control.2, because general mains by harmonics only accounts for about 5% of total current, the capacity of the harmonic wave inhibition circuit that therefore increases is less, and the control winding that increases on the transformer can not influence original operation of transformer yet.3, device is simple, small investment, good economy performance.4, by changing the parameter and the design of filter, can eliminate the harmonic wave in specific subharmonic or the certain frequency band range targetedly, can also increase the control winding that suppresses harmonic wave in case of necessity, obtain better harmonic suppression effect.5, the tracking performance to the load harmonic wave is good, and behind selected diverting coefficient and harmonic wave control umber of turn, the control winding current is followed the variation of load harmonic wave automatically and changed.
Description of drawings
Fig. 1: the electrical schematic diagram of this method
Fig. 2: the three-phase transformer structure chart of band harmonic wave control winding
Among Fig. 1: the 1-transformer; The former limit of 2-transformer winding; 3-transformer secondary winding; The harmonic wave control winding that 4-increases; 5-harmonic wave separation device; 6-electric current detector; 7-transformer first-harmonic magnetic linkage; The harmonic wave magnetic linkage that the 8-load produces; The harmonic wave magnetic linkage that 9-harmonic wave control winding produces
Among Fig. 2: u
A, u
B, u
CBe respectively three phase windings on the former limit of transformer, u
a, u
b, u
c, be respectively three phase windings of transformer secondary, u
Ka, u
Kb, u
KcBe respectively the three phase harmonic control winding of transformer.
Embodiment
The transformer load electric current has comprised first-harmonic (50HZ) and two kinds of components of harmonic wave, and two kinds of components of load current produce fundamental magnetic potential F during by transformer secondary winding respectively
1With harmonic magnetic potential F
2, the fundamental magnetic potential of load and harmonic magnetic potential produce first-harmonic magnetic linkage 7 and harmonic wave magnetic linkage 8 respectively in the magnetic circuit of transformer.Load-side at transformer is passed through electric current detector 6, and splitter section contains the load current i of harmonic wave
3=k
1i
2(in the formula: i
2-transformer load side electric current, i
3-electric current detector detects electric current, k
1-diverting coefficient).The current i of shunting
3Detecting through harmonic wave separation device 5 wherein needs the harmonic component i that eliminates
4With the harmonic component current i that detects
4Insert the harmonic wave control winding 4 of transformer, produce relevant subharmonic magnetic potential F
3=W i
4(in the formula: F
3-control winding harmonic magnetic potential, W-controls umber of turn), by the joint of change control winding, and regulate diverting coefficient k
1With control umber of turn W, make harmonic wave control winding produce relevant subharmonic magnetic potential F
3Harmonic magnetic potential F with the transformer load generation
2Equal and opposite in direction and direction is opposite, thus reach by F
3The harmonic wave magnetic linkage (9) and the F that produce
2The purpose that the harmonic wave magnetic linkage (8) that produces is cancelled out each other.Owing in transformer magnetic circuit, eliminated the magnetic potential and the magnetic linkage of harmonic wave, therefore in the winding of the former limit of transformer, can not respond to the generation harmonic current again, the harmonic wave that is produced by load can not exerted an influence to the former limit of transformer electrical network, reach the purpose of administering mains by harmonics, other user can not contained the cleaning electric energy of harmonic wave on the electrical network.
Claims (3)
1, transformer magnetic circuit control suppresses and eliminates the method for mains by harmonics, it is characterized in that: on the basis of the original former secondary winding of transformer, increase harmonic wave control winding (4), it in the load-side of transformer series current detector (6) on the circuit of harmonic wave generation side, electric current detector (6) back connects harmonic wave separation device (5), the output of harmonic wave separation device (5) is received the two ends of transformer control winding (4), the load current that contains harmonic wave in the load-side of transformer by electric current detector (6) splitter section, the electric current of shunting detects through harmonic wave separation device (5) wherein needs the harmonic component eliminated, the harmonic component that detects is inserted the harmonic wave control winding (4) of transformer, and by changing the connected mode of control winding, and the number of turn of the diverting coefficient of design current detector and control winding, the magnetic linkage that the control winding is produced is offset mutually on the contrary with the harmonic wave magnetic linkage size equidirectional that the transformer load side produces, thereby can suppress and harmonic carcellation in the inner magnetic circuit of transformer.
2, method according to claim 1 is characterized in that electric current detector (6) wherein adopts current transformer, and harmonic wave separation device (5) adopts the Passive LC filter.
3, method according to claim 1 is characterized in that harmonic wave separation device (5) wherein adopts active filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100402903A CN100352124C (en) | 2005-05-30 | 2005-05-30 | Method for controlling, restraining and eliminating voltage network harmonic of transformer magnetic circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100402903A CN100352124C (en) | 2005-05-30 | 2005-05-30 | Method for controlling, restraining and eliminating voltage network harmonic of transformer magnetic circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1722564A CN1722564A (en) | 2006-01-18 |
| CN100352124C true CN100352124C (en) | 2007-11-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100402903A Expired - Fee Related CN100352124C (en) | 2005-05-30 | 2005-05-30 | Method for controlling, restraining and eliminating voltage network harmonic of transformer magnetic circuit |
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| CN (1) | CN100352124C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101806851B (en) * | 2010-03-04 | 2013-04-10 | 重庆市电力公司电力科学研究院 | Electromagnetic type voltage transformer induced over voltage withstand test system and method |
| CN105790596B (en) * | 2016-02-29 | 2018-01-05 | 珠海格力电器股份有限公司 | The control method of frequency conversion equipment and frequency conversion equipment |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11215704A (en) * | 1998-01-20 | 1999-08-06 | Victor Co Of Japan Ltd | Power circuit and transformer |
| CN1095233C (en) * | 1999-12-04 | 2002-11-27 | 华中理工大学 | Serial active filter method and system based on fundamental flux compensation |
| CN2569414Y (en) * | 2002-08-26 | 2003-08-27 | 湖北追日电气设备有限公司 | Harmonic wave comprehensive suppressor |
| WO2004013951A2 (en) * | 2002-08-05 | 2004-02-12 | Engineering Matters, Inc. | Self-powered direct current mitigation circuit for transformers |
| CN2658999Y (en) * | 2003-11-21 | 2004-11-24 | 华南理工大学 | Power transformer capable of filtering |
| CN1553553A (en) * | 2003-12-19 | 2004-12-08 | 刘福生 | Rectification transformers with self coupling compensation and resournace shield |
| CN2686059Y (en) * | 2003-08-09 | 2005-03-16 | 特变电工衡阳变压器有限公司 | Transformer using iron core magnetic flux to suppress harmonic wave |
| CN1601844A (en) * | 2004-09-30 | 2005-03-30 | 清华大学 | power transformer having harmonic suppression function and based on harmonic paraphase principle |
-
2005
- 2005-05-30 CN CNB2005100402903A patent/CN100352124C/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11215704A (en) * | 1998-01-20 | 1999-08-06 | Victor Co Of Japan Ltd | Power circuit and transformer |
| CN1095233C (en) * | 1999-12-04 | 2002-11-27 | 华中理工大学 | Serial active filter method and system based on fundamental flux compensation |
| WO2004013951A2 (en) * | 2002-08-05 | 2004-02-12 | Engineering Matters, Inc. | Self-powered direct current mitigation circuit for transformers |
| CN2569414Y (en) * | 2002-08-26 | 2003-08-27 | 湖北追日电气设备有限公司 | Harmonic wave comprehensive suppressor |
| CN2686059Y (en) * | 2003-08-09 | 2005-03-16 | 特变电工衡阳变压器有限公司 | Transformer using iron core magnetic flux to suppress harmonic wave |
| CN2658999Y (en) * | 2003-11-21 | 2004-11-24 | 华南理工大学 | Power transformer capable of filtering |
| CN1553553A (en) * | 2003-12-19 | 2004-12-08 | 刘福生 | Rectification transformers with self coupling compensation and resournace shield |
| CN1601844A (en) * | 2004-09-30 | 2005-03-30 | 清华大学 | power transformer having harmonic suppression function and based on harmonic paraphase principle |
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|---|---|
| CN1722564A (en) | 2006-01-18 |
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