CN202373974U - Harmonic processing device of low-voltage power grid - Google Patents
Harmonic processing device of low-voltage power grid Download PDFInfo
- Publication number
- CN202373974U CN202373974U CN2011204951135U CN201120495113U CN202373974U CN 202373974 U CN202373974 U CN 202373974U CN 2011204951135 U CN2011204951135 U CN 2011204951135U CN 201120495113 U CN201120495113 U CN 201120495113U CN 202373974 U CN202373974 U CN 202373974U
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- Prior art keywords
- harmonic
- switch
- compensation
- contactless electronic
- electronic beam
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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
- Y02E40/30—Reactive power compensation
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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
A harmonic processing device of low-voltage power grid belongs to the electric system equipment. The device comprises a total inlet wire switch, a branch switch, a fusing protector, a thyristor contactless electronic switch, a harmonic suppressor, a compensating capacitor, a harmonic resistance reactive compensation controller, a current transformer, a trigger board of the thyristor contactless electronic switch, a power factor meter and a manual trigger switch which are connected with bus. According to the harmonic processing device of low-voltage power grid, not only the harmonic resistance reactive compensation controller has high detection accuracy and stable output, but also problems of harmonic interference and reactive compensation occurring in the power grid are effectively solved. As a manual compensation control device is adopted simultaneously during the automatic harmonic resistance reactive compensation control, the manual compensation control device can be started when something is wrong with the automatic harmonic resistance reactive compensation controller, and management of electric field harmonics is not suspended; further, the harmonic processing device has the advantages of being fast in switching speed, high in compensation efficiency, long in service life and the like, and has good popularization and use value.
Description
Technical field
The utility model relates to a kind of power system device, especially a kind of harmonic treating apparatus of low voltage electric network.
Background technology
Along with expanding economy, the raising of people's living standard, a large amount of new and high technologies continue to bring out and are applied to rapidly in the middle of our life.In various new and high technologies; The application of electronic circuit and power electronic technology is particularly evident; They are used very extensively in fields such as family, industry, commerce, traffic, finance, telecommunication telecommunications, medical treatment, the intelligent office of government and national defence; And worth people's thinking is that when these new and high technologies offered convenience to people, negative effect also became increasingly conspicuous.
Current; Electronic technology just towards high frequency, at a high speed, high sensitivity, high reliability, multi-functional, miniaturization development; The probability that so just makes modern electronic equipment produce and accept electromagnetic interference increases greatly; On the other hand, the power capacity of power electronic equipment self and power density also constantly increase, and the pollution that causes electrical network and electromagnetic environment on every side thereof to suffer is serious day by day; Wherein, Harmonic Interference become many electronic equipments and system can be in one of major obstacle of site of deployment normal reliable operation.Such as; The extensive use of high-power silicon controlled rectifier; A large amount of nonlinear-loads increase; The particularly progress of electronic technology, power-saving technology and control technology has been used various rectifying installations, alternating current-direct current converter and electronic voltage adjustment equipment in a large number in departments such as chemical industry, metallurgy, iron and steel, intelligent three A systems (equipment automatization system, the office automation system, communication automated system), colliery and traffic, and electric smelting equipment, electrochemical apparatus, mine hoisting equipment, openwork equipment, electrical equipment locomotive etc. grow with each passing day; In addition, miscellaneous ligthing paraphernalia, recreational facilities and household electrical appliance etc. are also popularized and are used.More than all factors, make the electric power system waveform seriously distort.Therefore, Harmonic Interference has become modern electric engineering design and researcher's necessary problem of considering in design process.
In low voltage electric network, existing harmonic wave control equipment generally can be administered the Harmonic Interference problem that occurs in the electric power system; But generally; Equipment on the market often exists that data acquisition is untimely, inaccurate, problem such as compensation hysteresis etc., thereby makes harmonic wave control untimely not in place, further causes equipment to be in overload operation for a long time or is in the middle of the serious electromagnetic pollution; Reduce service life of equipment, caused loss for enterprise or family.Even more serious is, if administer untimelyly, also resonance phenomena can occur in the electrical network, can cause the partial electric grid paralysis.
The utility model content
To above-mentioned deficiency of the prior art, the utility model provides a kind of harmonic treating apparatus of low voltage electric network, this device can effectively solve occur in the electrical network Harmonic Interference and reactive power compensation problem.
The utility model solves the technical scheme that its technical problem adopted: a kind of harmonic treating apparatus of low voltage electric network; It is characterized in that; The trigger board that comprises the total input-wire switch, branch switch, fuse protection device, thyristor contactless electronic beam switch, harmonic shutter, compensation condenser, anti-harmonic reactive-load compensation controller, current transformer and the thyristor contactless electronic beam switch that are connected with bus; Said each branch switch is connected with the total input-wire switch respectively; Said harmonic shutter two ends are connected with compensation condenser with the thyristor contactless electronic beam switch respectively, also are connected with the fuse protection device between said thyristor contactless electronic beam switch and the branch switch; The voltage signal of said anti-harmonic reactive-load compensation controller draws from bus; Current signal draws from being arranged on the current transformer in the bus circuit; Export 8-16 loop; Output loop is connected with the trigger board of thyristor contactless electronic beam switch, in order to the switching of control compensation capacitor, electrical network is carried out anti-harmonic wave dynamic passive compensation.
Further, also comprise power factor meter and manual trigger switch, said power factor meter is connected in the bus bar circuit, and said manual trigger switch is connected with the trigger board of thyristor contactless electronic beam switch.
The beneficial effect of the utility model: the not only anti-harmonic reactive-load compensation controller of the utility model accuracy of detection is high, output is stable, and efficiently solve occur in the electrical network Harmonic Interference and reactive power compensation problem.The utility model can be launched the manual compensation control device owing in automatic anti-harmonic reactive-load compensation control, also taked the manual compensation control device when automatic compensation controller goes wrong, do not interrupt the improvement to the electric field harmonic wave; Also have characteristics such as switching speed is fast, compensation efficient height, long service life, have the excellent popularization value.This device can satisfy the power network harmonic wave management needs of present stage fully, reduces electrical network waveform abnormal rate greatly, realizes the energy-conservation 10-30% of electrical network.
Description of drawings
Fig. 1 is the electrical schematic diagram of the utility model;
Wherein, 1 total input-wire switch, 2 branch switchs, 3 fuse protection devices, 4 thyristor contactless electronic beam switch, 5 harmonic shutters, 6 compensation condensers, 7 anti-harmonic reactive-load compensation controllers, 8 current transformers, the trigger board of 9 thyristor contactless electronic beam switch, 10 power factor meters, 11 manual trigger switch.
Embodiment
As shown in Figure 1; The harmonic treating apparatus of this kind low voltage electric network; The trigger board 9, power factor meter 10 and the manual trigger switch 11 that comprise the total input-wire switch 1 that is connected with bus, branch switch 2, fuse protection device 3, thyristor contactless electronic beam switch 4, harmonic shutter 5, compensation condenser 6, anti-harmonic reactive-load compensation controller 7, current transformer 8, thyristor contactless electronic beam switch; Said each branch switch 2 is connected with total input-wire switch 1 respectively; Said harmonic shutter 5 two ends are connected with compensation condenser 6 with thyristor contactless electronic beam switch 4 respectively, also are connected with fuse protection device 3 between said thyristor contactless electronic beam switch 4 and the branch switch 2; The voltage signal of said anti-harmonic reactive-load compensation controller 7 draws from bus; Current signal draws from being arranged on the current transformer 8 in the bus circuit; Export 8-16 loop; Output loop is connected with the trigger board 9 of thyristor contactless electronic beam switch, in order to the switching of control compensation capacitor 6, electrical network is carried out anti-harmonic wave dynamic passive compensation.Said power factor meter 10 is connected in the bus bar circuit; Said manual trigger switch 11 is connected with the trigger board 9 of thyristor contactless electronic beam switch; The trigger board 9 of said power factor meter 10 and thyristor contactless electronic beam switch is formed the manual compensation control device; When autocompensation installation breaks down, can adopt manual operation that certain loop is compensated.
The know-why that the utility model is taked:
One, this device is realized the technical basis of harmonic wave control:
If R is a line resistance, Δ P1 is former line loss, and Δ P2 is the line loss after power factor improves, and then line loss reduces
ΔP＝ΔP1-ΔP2＝3R(I12-I22)(1)
The percentage that reduces than original loss does
(ΔP/ΔP1)×100％＝1-(I2/I1)·100％(2)
In the formula, I1=P/ (3U1cos ∮ 1), after I2=P/ (the 3U2cos ∮ 2) compensation, because power factor improves, U2＞U1 is easy analysis, can think U2 ≈ U1, then
θ＝[1-(cos∮1/cos∮2)]·100％(3)
When power factor when 0.8 is increased to 0.9, calculate through following formula, can try to achieve active loss and reduce about 21%.
Under the constant situation of transmission power P=3UIcos ∮, cos ∮ improves, and I is relatively low, establish I2 for compensation before the electric current of transformer, I2 is the electric current of compensation back transformer, copper loss is respectively Δ P1, Δ P2; Square being directly proportional of copper loss and electric current, promptly
ΔP1/ΔP2＝I22/I12
Because P1=P2, when thinking U2 ≈ U1, promptly I2/I1=cos ∮ 1/cos ∮ 2
Can know that power factor was increased to from 0.8 at 0.9 o'clock, copper loss is equivalent to original 80%.
Two, the inhibition of harmonic wave:
The pulse number of three bridge circuits is brought up to 12 from 6, can eliminate 5 times, 7 subharmonic.Many harmonic sources knot is connected to same section bus, utilizes the mutual compensating action of harmonic wave also can reduce the harmonic content of electrical network.
When harmonic content exceeds that rules allow or electrical network when in the harmonic wave scope, resonance being arranged, dull thin filter is set usually absorbs characteristic harmonics.For the harmonic wave more than 13 times, a high pass filter can be set.Filter circuit also can absorb the original harmonic wave of electrical network possibly cause overload; Generally can be through adjustment off resonance rate; Reduce quality factor or avoid overload through additional electronics; Capacitor can form harmonic wave through series reactor and block the loop, and to prevent the overload of capacitor harmonic wave, general series resonance frequency is below 250HZ.
Three, the compensation of harmonic wave
Electrical network has resonance under 5 subfrequencies, and parallel impedance XP raises greatly, and 5 subharmonic currents that sent by harmonic source produce very high harmonic voltage after flowing into resonant tank.Harmonic voltage is superimposed upon on the fundamental voltage.Cause voltage waveform that deformity takes place, the balanced balanced current that between electrical network and capacitor, flows can reach the several times that harmonic source sends electric current.Be that harmonic wave amplifies, this moment, transformer and capacitor bore the load greater than normal condition.Particularly capacitor long-time running overload state is quickened ageing of insulation, even breakdown and explosion.Can precompute parallel resonance frequency according to electric network impedance and condenser impedance, the configuration of adjustment condenser capacity makes parallelly connected harmonic frequency and characteristic harmonics frequency keep certain distance, avoids harmonic wave to amplify.But actual electric network impedance is not a constant, but is among the continuous variation, is difficult to avoid fully resonance.In the time need compensating, must parallel resonant point be moved on to safe position, and facts have proved that method is exactly a series reactor in capacitor loops the most reliably the electrical network that harmonic source equipment is arranged.Two principle a of filter circuit: be mainly used in the absorption harmonic wave, reduce the line voltage deformity, fundamental wave reactive power power occupies backseat b: improve power factor of electric network, absorb harmonic wave simultaneously, condenser capacity is by the requirement configuration of reactive power.
This device compensation effect is obvious, and controller adopts open loop control, according to the size of the idle component in the system power, but the compensation one-time-reach-place; Switching speed is fast, dynamic response time≤20ms, and this device capacitor group drops into once more and can in a cycle, accomplish after withdrawing from.
Claims (2)
1. the harmonic treating apparatus of a low voltage electric network; It is characterized in that; The trigger board that comprises the total input-wire switch, branch switch, fuse protection device, thyristor contactless electronic beam switch, harmonic shutter, compensation condenser, anti-harmonic reactive-load compensation controller, current transformer and the thyristor contactless electronic beam switch that are connected with bus; Said each branch switch is connected with the total input-wire switch respectively; Said harmonic shutter two ends are connected with compensation condenser with the thyristor contactless electronic beam switch respectively, also are connected with the fuse protection device between said thyristor contactless electronic beam switch and the branch switch; The voltage signal of said anti-harmonic reactive-load compensation controller draws from bus; Current signal draws from being arranged on the current transformer in the bus circuit; Export 8-16 loop; Output loop is connected with the trigger board of thyristor contactless electronic beam switch, in order to the switching of control compensation capacitor, electrical network is carried out anti-harmonic wave dynamic passive compensation.
2. the harmonic treating apparatus of a kind of low voltage electric network according to claim 1; It is characterized in that; Also comprise power factor meter and manual trigger switch, said power factor meter is connected in the bus bar circuit, and said manual trigger switch is connected with the trigger board of thyristor contactless electronic beam switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204951135U CN202373974U (en) | 2011-12-02 | 2011-12-02 | Harmonic processing device of low-voltage power grid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204951135U CN202373974U (en) | 2011-12-02 | 2011-12-02 | Harmonic processing device of low-voltage power grid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202373974U true CN202373974U (en) | 2012-08-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204951135U Expired - Lifetime CN202373974U (en) | 2011-12-02 | 2011-12-02 | Harmonic processing device of low-voltage power grid |
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| Country | Link |
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| CN (1) | CN202373974U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103840466A (en) * | 2014-03-31 | 2014-06-04 | 成都振中电气有限公司 | Tuning type reactive power compensation electrical cabinet |
| WO2014161459A1 (en) * | 2013-03-30 | 2014-10-09 | Neal George Stewart | Algorithm for passive power factor compensation method with differential capacitor change and reduced line transient noise |
| CN110971013A (en) * | 2019-12-11 | 2020-04-07 | 中国电力科学研究院有限公司 | Method and system for determining detuning parameters of wireless energy transmission converter |
-
2011
- 2011-12-02 CN CN2011204951135U patent/CN202373974U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014161459A1 (en) * | 2013-03-30 | 2014-10-09 | Neal George Stewart | Algorithm for passive power factor compensation method with differential capacitor change and reduced line transient noise |
| CN103840466A (en) * | 2014-03-31 | 2014-06-04 | 成都振中电气有限公司 | Tuning type reactive power compensation electrical cabinet |
| CN110971013A (en) * | 2019-12-11 | 2020-04-07 | 中国电力科学研究院有限公司 | Method and system for determining detuning parameters of wireless energy transmission converter |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120808 |
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| CX01 | Expiry of patent term |