CN202026091U - Nonresonant zero-sequence filtering device based on magnetic flux compensation - Google Patents
Nonresonant zero-sequence filtering device based on magnetic flux compensation Download PDFInfo
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- CN202026091U CN202026091U CN2010206443941U CN201020644394U CN202026091U CN 202026091 U CN202026091 U CN 202026091U CN 2010206443941 U CN2010206443941 U CN 2010206443941U CN 201020644394 U CN201020644394 U CN 201020644394U CN 202026091 U CN202026091 U CN 202026091U
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- 238000001914 filtration Methods 0.000 title claims abstract description 34
- 230000004907 flux Effects 0.000 title claims abstract description 16
- 238000004804 winding Methods 0.000 claims abstract description 38
- 230000000694 effects Effects 0.000 description 5
- 230000010363 phase shift Effects 0.000 description 5
- 238000000819 phase cycle Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
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- 238000003199 nucleic acid amplification method Methods 0.000 description 2
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The utility model provides a nonresonant zero-sequence filtering device based on magnetic flux compensation. The nonresonant zero-sequence filtering device comprising a zig-zag wiring zero-sequence current filtering module (1) and a zero-sequence current limit module (2), wherein the zig-zag wiring zero-sequence current filtering module (1) is provided with three core columns, each core column is provided with an upper winding and a lower winding with a same turn number and a same winding direction, a lower end wire of the upper winding of an a phase core column is connected with a lower end wire of the lower winding of a b phase core column, a lower end wire of the upper winding of the b phase core column is connected with a lower end wire of the lower winding of a c phase core column, a lower end wire of the upper winding of the c phase core column is connected with a lower end wire of the lower winding of the a phase core column, upper end wires of the upper windings of the three core columns are respectively connected in parallel with an a phase, a b phase and a c phase of a three-phase alternating current finally, and the upper end wires of the lower windings of the three core columns are connected with a system midline N after being connected together; and the zero-sequence current limit module (2) is formed by three windings which are wound on a same core column in the same direction.
Description
Technical field
The utility model belongs to quality of power supply adjustment technology field, and a kind of disresonance Zero-pharse harmonic device based on flux compensation particularly is provided.
Background technology
Those skilled in the art is fully aware of, and in low-voltage distribution system, the three-phase four-wire power supply mode is topmost supply power mode, is used widely in industry spot and civil buildings.Along with the modernization in city, a large amount of large-scale commercial building and office building have appearred, in these buildings, exist household electrical appliance, mains lighting supply and uninterrupted power supplys etc. such as a large amount of personal computer business automation equipments, convertible frequency air-conditioner.These equipment all can produce a large amount of Zero-pharse harmonic electric currents in electrical network, even their separate unit power is less, but huge because of its sum, the harmonic pollution that is brought is extremely serious.Zero-pharse harmonic electric current (mainly being 3 subharmonic currents) mutual superposition on center line makes that the harmonic wave situation in the current in middle wire is serious unusually.The design load that the center line harmonic current makes current in middle wire substantially exceed it on the one hand causes the center line fault; Make that on the other hand common transformer is overheated, accelerate ageing of insulation, potential faults is increased greatly.Also can cause the center line potential to ground to raise simultaneously, can cause the neutral line to blow when serious, cause that three-phase voltage is seriously asymmetric, may cause the large tracts of land power consumption equipment to be damaged.Make the element in the utility network produce supplementary load loss in addition, reduced the efficiency of power-driven equipment, 3 a large amount of subharmonic can cause the long-term overheated even breaking out of fire of circuit when flowing through the neutral line.
For the Zero-pharse harmonic electric current in the inhibition system, the passive and active filtering mode of main at present employing:
Because passive filter has small investment, efficient height, advantage such as simple in structure, reliable and easy to maintenance, so passive filter is the main means of the inhibition harmonic wave that extensively adopts at present.But because passive filter is by providing a low impedance path in parallel to play filter action for harmonic wave in system, its filtering characteristic is that the impedance ratio by system and filter is determined, therefore have following shortcoming: 1) harmonic characterisitic is subjected to influence on system parameters big; 2) can only eliminate specific several subharmonic, and may produce amplification some subharmonic; 3) filtering requirements, reactive power compensation and pressure regulation require to be difficult to coordinate; When 4) harmonic current increases, cause the filter overload easily; 5) capacitor parameters changes easily along with medium is aging, the off resonance phenomenon occurs, and filter effect is greatly descended; 6) effective high material consumption, volume is bigger.
Worth emphasis is pointed out that, the effective each harmonic of the non-zero sequence of filtering of passive filter in actual applications, but desirable not to the utmost for the filtration result of Zero-pharse harmonic.Particularly,, be difficult to reach the design application requirements because harmonic number is very near from power frequency, thereby suppresses weak effect to system and 3 maximum subharmonic of equipment harm.
Because the above-mentioned shortcoming of passive filter, along with the continuous development of power electronic technology, the research of active filter is used and is subjected to people's attention.Although but the huge technical advantage that APF has passive filter not possess, it is also unrealistic to replace passive filter at present.Mainly be that problems such as reliability have limited it and applied owing to the APF cost.
And utilize star triangularity depressor that zero-sequence current is formed internal loop, make the method that zero-sequence current does not embody at primary side, because all load capacities are provided by transformer, effective material consumption height, volume is bigger, can only be applicable to specified conditions, is not the filtering mode of universal significance.
Summary of the invention
The purpose of this utility model is to provide a row's resonance zero sequence filtering device based on flux compensation, can realize low impedance path, the Zero-pharse harmonic electric current is flowed between filter and load, rather than flow back to system through center line.It has better combination property based on the disresonance zero sequence filter of tortuous phase shift, no electric capacity topology.
What the utility model proposes is made up of two parts, is respectively tortuous phase shift zero-sequence current filtering module and zero-sequence current limiting module.Described tortuous phase shift zero-sequence current filtering module is three stem stems, two identical windings of the number of turn on each stem stem, connected mode is that end line is continuous in the last end line of the following winding of another one stem stem on the top winding of first stem stem, other stem stems are tortuous successively to link to each other, at last the lower end outlet of three windings in three stem stem tops is connected in parallel on A respectively, B on the C three-phase electricity, links to each other the lower end outlet of three the stem stem lower end windings back that links to each other with the system center line; Because its six umber of turns equate, after the tortuous oppositely connection, the zero sequence magnetic flux is cancelled out each other, and the positive sequence magnetic flux can not be cancelled out each other, thereby only to zero-sequence current performance Low ESR, when it is connected in parallel in the system just for Zero-pharse harmonic provides low impedance path, thereby make the Zero-pharse harmonic electric current mobile between this module and load, and do not flow into system, realized the zero sequence filtering effect more satisfactoryly.The zero-sequence current limiting module is made of three windings that are wrapped in side by side on the same stem stem, the positive sequences that produce of its three windings like this, and the negative phase-sequence magnetic flux is cancelled out each other, the zero sequence magnetic flux is strengthened mutually, so zero-sequence current is shown high impedance, and to positive sequence, negative phase-sequence shows Low ESR.In system it is installed in series at the module front end like this, the zero-sequence current because of the asymmetric generation of power supply greatly is limited to minimum numerical value because of the loop zero sequence impedance like this; Protected zero-sequence current filtering module, unlikely its overcurrent, the zero-sequence current limiting module does not have influence substantially to system's positive sequence, negative sequence component simultaneously.
The utility model proposes based on flux compensation, non-resonant zero sequence filtering device, outside having kept passive filter small investment, efficient height, advantage such as simple in structure, reliable and easy to maintenance, its many shortcomings have also been overcome, be not subjected to electrical network parameter to influence, other harmonic waves are not produced amplification, do not have the off resonance problem as filtering characteristic, unbalance voltage is had damping action etc.; Compare with active filter, with low cost, reliable operation, overload capacity are strong.Simultaneously, can realize the low impedance path of fundamental wave zero sequence, the serious imbalance that single-phase load is caused has tangible load balance effect.Therefore, the zero sequence filtering device that the utility model proposes demonstrates significant technological merit, has huge using value and market prospects in low-voltage network.
Description of drawings
The equivalent circuit theory structure chart of accompanying drawing 1 the utility model connecting system;
Accompanying drawing 2 tortuous phase shift zero-sequence current filtering modular structure schematic diagrames of the present utility model;
Accompanying drawing 3 the utility model zero-sequence current limiting module structural representations.
Among the figure, electric current filtering module-1, zero-sequence current limiting module-2.
Embodiment
The equivalent circuit structure schematic diagram of the non-resonant zero sequence filtering device of the zigzag connection that the utility model proposes is made up of two parts as shown in Figure 1, is respectively tortuous phase shift zero-sequence current filtering module 1 and zero-sequence current limiting module 2.In Fig. 2, zigzag connection zero-sequence current filtering module is three stem stems, two identical windings of the number of turn on each stem stem, connected mode is that end line is continuous in the last end line of the following winding of another one stem stem on the top winding of first stem stem, other stem stems are tortuous successively to link to each other, and at last the lower end outlet of three windings in three stem stem tops is connected in parallel on A, B respectively, on the C three-phase electricity, the lower end outlet of three the stem stem lower end windings back that links to each other is linked to each other with the system center line; Because its six umber of turns equate, after the tortuous oppositely connection, the zero sequence magnetic flux is cancelled out each other, and the positive sequence magnetic flux can not be cancelled out each other, thereby only to zero-sequence current performance Low ESR, when it is connected in parallel in the system just for Zero-pharse harmonic provides low impedance path, thereby make the Zero-pharse harmonic electric current mobile between this module and load, and not flowing into system, perfection has realized the zero sequence filtering effect.Zero-sequence current limiting module such as accompanying drawing 3 are made of three windings that are wrapped in side by side on the same stem stem, like this its three positive sequences that winding produces, the negative phase-sequence magnetic flux is cancelled out each other, and the zero sequence magnetic flux is strengthened mutually, so zero-sequence current is shown high impedance, and to positive sequence, negative phase-sequence shows Low ESR.In system it is installed in series at zero-sequence current filtering module 1 front end like this, the zero-sequence current because of the asymmetric generation of power supply greatly is limited to minimum numerical value because of the loop zero sequence impedance like this; Protected zero-sequence current filtering module 1, unlikely its overcurrent, the zero-sequence current limiting module does not have influence substantially to system's positive sequence, negative sequence component simultaneously.
Claims (2)
1. based on the disresonance zero sequence filtering device of flux compensation, form by zigzag connection zero-sequence current filtering module (1) and zero-sequence current limiting module (2), it is characterized in that: zigzag connection zero-sequence current filtering module (1) is provided with three stem stems, two windings are up and down arranged on each stem stem, and the number of turn is identical, around to identical, a be mutually winding on the stem stem following end line and b mutually under the stem stem the following end line of winding link to each other, on the b phase stem stem the following end line of winding and c mutually under the stem stem the following end line of winding link to each other, on the c phase stem stem the following end line of winding and a mutually under the stem stem the following end line of winding link to each other, at last the last end line of winding on three stem stems is connected in parallel on a of three-phase alternating current respectively, b, on the c three-phase, the continuous back of the last end line of winding under three stem stems is linked to each other with the center line N of system, and zero-sequence current limiting module (2) is made of three windings that are wrapped in the same way on the same stem stem.
2. the described disresonance zero sequence filtering device of claim 1 based on flux compensation, it is characterized in that: six windings on (1) three stem stem of described zigzag connection zero-sequence current filtering module have the identical number of turn, when it is connected in parallel in the system, provide low impedance path by the reverse ways of connecting of complications for the Zero-pharse harmonic electric current, module (2) by three phase windings in the same way and around, it is connected in the three-phase system, and is installed on zigzag connection zero-sequence current filtering module (1) front end.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206443941U CN202026091U (en) | 2010-12-02 | 2010-12-02 | Nonresonant zero-sequence filtering device based on magnetic flux compensation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010206443941U CN202026091U (en) | 2010-12-02 | 2010-12-02 | Nonresonant zero-sequence filtering device based on magnetic flux compensation |
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| CN202026091U true CN202026091U (en) | 2011-11-02 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI511404B (en) * | 2014-05-16 | 2015-12-01 | Nat Univ Tsing Hua | Apparatus of Low Voltage Ride-Through with Flux Chain Compensation and Current Peak Management |
| CN105515026A (en) * | 2016-01-07 | 2016-04-20 | 山东邦世电气有限公司 | Hybrid electric balancer based on combination of passive zero sequence filtering technology and active filtering technology |
| CN106505573A (en) * | 2016-11-30 | 2017-03-15 | 广东电网有限责任公司茂名供电局 | Flux compensation type power distribution network neutral conductor Zero-pharse harmonic restraining device |
-
2010
- 2010-12-02 CN CN2010206443941U patent/CN202026091U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI511404B (en) * | 2014-05-16 | 2015-12-01 | Nat Univ Tsing Hua | Apparatus of Low Voltage Ride-Through with Flux Chain Compensation and Current Peak Management |
| CN105515026A (en) * | 2016-01-07 | 2016-04-20 | 山东邦世电气有限公司 | Hybrid electric balancer based on combination of passive zero sequence filtering technology and active filtering technology |
| CN106505573A (en) * | 2016-11-30 | 2017-03-15 | 广东电网有限责任公司茂名供电局 | Flux compensation type power distribution network neutral conductor Zero-pharse harmonic restraining device |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 650011 No. 63 East extension Road, Yunnan, Kunming Co-patentee after: WUHAN SHUIYUAN ELECTRICAL Co.,Ltd. Patentee after: Yunnan Power Grid Corporation Address before: 650011 No. 39 East extension Road, Yunnan, Kunming Co-patentee before: WUHAN SHUIYUAN ELECTRICAL Co.,Ltd. Patentee before: KUNMING POWER SUPPLY BUREAU, YUNNAN POWER GRID Corp. |
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| CP03 | Change of name, title or address | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20191009 Address after: 650011 No. 63 East extension Road, Yunnan, Kunming Patentee after: Yunnan Power Grid Corporation Address before: 650011 No. 63 East extension Road, Yunnan, Kunming Co-patentee before: WUHAN SHUIYUAN ELECTRICAL Co.,Ltd. Patentee before: Yunnan Power Grid Corporation |
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| TR01 | Transfer of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20111102 |
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| CX01 | Expiry of patent term |