CN201417951Y - Tunable filter - Google Patents
Tunable filter Download PDFInfo
- Publication number
- CN201417951Y CN201417951Y CN2009203034517U CN200920303451U CN201417951Y CN 201417951 Y CN201417951 Y CN 201417951Y CN 2009203034517 U CN2009203034517 U CN 2009203034517U CN 200920303451 U CN200920303451 U CN 200920303451U CN 201417951 Y CN201417951 Y CN 201417951Y
- Authority
- CN
- China
- Prior art keywords
- reactor
- voltage
- harmonic
- capacitor
- tuning
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
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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
-
- 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 tunable filter comprises at least one group of turning circuits. Each turning circuit comprises a capacitor and a reactor. In each group of turning circuits, the resonance frequency of the capacitorand the reactor is smaller than the resonance frequency of the n-th harmonic wave of the system. According to the utility model, the reactor and the capacitor are matched correctly for preventing theserious result caused by insufficient voltage resistance of the capacitor and insufficient current resistance of the reactor. The tunable filter has the advantages of excellent capacitance inductancematching characteristic, excellent voltage resistance characteristic of the capacitor and excellent current resistance of the reactor, and simultaneously satisfies the requirement of the electric system to the harmonic wave and the reactive power. The electric network pollution is effectively purified and simultaneously the power supply quality is increased.
Description
Technical field
The utility model relates to a kind of tuned filter.
Background technology
Along with the high speed development of industrialization and IT application process and the extensive use of power electronic technology, harmonic wave and inhibition thereof more and more receive publicity.In a large amount of power electronic equipments, thyristor (SCR), power field effect pipe (VMOSFET), igbt large power semiconductor devices such as (IGBT) have been adopted, make power electronic equipment realize high frequencyization and miniaturization, electric property improves greatly, but the thing followed is to have produced harmonic wave, and electrical network is caused serious pollution.Power electronic equipment has become the topmost harmonic source of electrical network.Particularly controlled rectifier and half controlled rectifier owing to be used to the conversion of AC energy to direct current energy in most power electronic equipments, so reduce rectifier and electromagnetic component thereof to the harmonic pollution of electrical network, have become very thorny research and development problem.
The harm that harmonic wave caused can reduce the following aspects particularly:
1, harmonic wave is to the pollution of electrical network
The desirable voltage that electrical network provided should be single fixing, the voltage magnitude of frequency in allowed limits.Harmonic wave worsens grid supply quality to the pollution of electrical network waveform, the power consumption equipment on the same electrical network is had a strong impact on, even jeopardize the normal operation of power consumption equipment.Harmonic wave is a considerable aspect in the harmonic wave harm to the pollution of electrical network.
2, harmonic wave causes various power electronic equipments and breaks down
(1) harmonic wave makes the element in the system produce additional harmonic loss, except that the efficient that reduces generating, power transmission and distribution and other power consumption equipments, in the circuit of three-phase four-wire system, because a large amount of Zero-pharse harmonic electric current, particularly 3 subharmonic currents flow through center line, can cause that center line is overheated, the danger of initiation fire is arranged.In addition, the increase of unusual, excessive current in middle wire can cause the center line of electrical network that the voltage of ground wire is uprushed, and will jeopardize the safety of data handling system;
(2) harmonic wave is for electric rotating machine, also can produce mechanical oscillation, noise and harmonic wave overvoltage except increasing loss and causing the heating, and this life-span to motor causes and seriously influences;
(3) harmonic current inflow transformer can increase the copper loss and the iron loss of transformer, causes the transformer heating.Harmonic wave also can make noise of transformer increase;
(4) the harmonic current power cable of flowing through, it is overheated to make cable take place, and long-term overheated operation will cause the ageing of insulation of cable, even produce electric leakage and short circuit phenomenon.
3, harmonic wave causes resonance
For compensating power and filtering harmonic wave, usually need shunt capacitor, the filter that capacitor and inductor are formed perhaps is set.Because harmonic frequency is higher than work frequency, the induction reactance that can make system increases and capacitive reactance reduces, and might produce LC resonance.Resonance has amplified harmonic current, and capacitor or inductor are burnt.Statistics from Japan shows, because harmonic wave causes that resonance causes in the electric equipment of damage, what capacitor damaged accounts for 40%, and what inductor damaged accounts for 30%.
4, harmonic wave causes the relay misoperation work and influences power measurement
(1) harmonic wave in the electric power system will make some relay and earth leakage circuit-breaker produce misoperation;
(2) harmonic wave brings direct influence to the measurement result of measuring instruments such as voltmeter, ammeter and wattmeter, and the error in dipping of particularly relevant with charge measuring instrument and people's lives and industrial production have substantial connection.
5, harmonic wave is to the harm of information technoloy equipment
In computer room, use rectifying and wave-filtering type nonlinear loads such as PC, server, switch in a large number, they inject zero-sequence current to electrical network, and electrical network is polluted.Conversely, the low power factor of electrical network can influence the normal operation of information technoloy equipment.
6, Harmonic Interference communication system
The electric power system through-put power can reach the MW level, and communication system power is little of the mW level, and both so big power is differential, causes uneven audio frequency harmonic component less relatively in the electric power system, in case be coupled on the communication line, may in communication system, produce very big noise.If in same electrical network, there are a plurality of neutral earthings, when bigger Zero-pharse harmonic electric current flows through, can the serious communication system of disturbing in the same electrical network.Noise will reduce the definition of conversation, even cause dropout.Statistics shows, when the harmonic component more than 25 times reaches certain amplitude, will produce communication system and disturb, particularly with the electric power system coupling closely with to the communication system of Harmonic Interference sensitivity, under the interference of harmonic wave, the work that very easily produces is not normal.
In order to guarantee that electrical network is not subjected to or is subjected to less the pollution of harmonic wave, so that provide high-quality electric energy to the electric equipment of getting involved in the electrical network, numerous and confused formulation standard is limited in the harmonic current of electrical network and harmonic voltage in the scope of permission both at home and abroad.For administering the harmonic pollution of power electronic equipment to electrical network, except that research and development net side high-power factory rectifier, utilize filter to absorb the harmonic wave that send in the filtering source, also be a kind of effective technical way that suppresses harmonic wave.
Summary of the invention
Problems such as tuned filter condenser reactance device coupling is incorrect in order to solve in the prior art for the utility model, the withstand voltage deficiency of capacitor and the anti-stream of reactor are not enough, and provide a kind of and have good capacitor, reactor matching properties, capacitor is withstand voltage and the tuned filter of the anti-properties of flow of reactor.
For achieving the above object, the technical scheme that the utility model adopted is:
A kind of tuned filter, comprise at least one group of tuning circuit, tuning circuit comprises capacitor, the reactor that is connected with described capacitor electrode, in every group of tuning circuit, the resonance frequency of capacitor and reactor is less than the nth harmonic resonance frequency of system, the absorption portion harmonic wave.Generally speaking, single tuned filter is used for certain odd harmonic of filtering, as wants the several odd harmonics of filtering, then will be accordingly with several single tuned filter parallel connections.Here, the resonance frequency of avoiding capacitor and reactor is greater than the nth harmonic resonance frequency, mainly be based on following consideration: because resonance frequency is high more, components and parts will strengthen the requirement of matching precision thereupon, requirement to technology also improves thereupon, thereby, for avoiding the nth harmonic resonant frequency point, with the identical resonance phenomena that produces with the nth harmonic resonance frequency of resonance frequency that prevents to cause owing to fabrication error capacitor and reactor, the resonance frequency that can only select capacitor and reactor is less than the nth harmonic resonance frequency.
As preferably, in the described tuning circuit of tuning triple-frequency harmonics, the reactance of reactor is 14.8% of a condenser reactance.In the tuning circuit of tuning quintuple harmonics, the reactance of reactor is 6% of a condenser reactance.According to the GB regulation, the fundamental frequency of system for distribution network of power is 50Hz, and third harmonic frequencies is 150Hz, and the quintuple harmonics frequency is 250Hz.According to formula
Calculate, in the tuning circuit of triple-frequency harmonics, as the reactance value X of reactor
L=14.8%X
CThe time, f
0=130Hz is 150Hz less than third harmonic frequencies; In the tuning circuit of quintuple harmonics, as the reactance value X of reactor
L=6%X
CThe time, f
0=204Hz is 150Hz less than third harmonic frequencies.
Capacitor and reactor are connected in series.
Electric capacity withstand voltage greater than system voltage V
S, the voltage rise V that produces of described reactor (2)
LAnd harmonic voltage V
HThree's sum.When calculable capacitor is withstand voltage, need taking into account system voltage V
S, the voltage rise V that produces of institute string reactor
LAnd harmonic voltage V
HIf capacitor is withstand voltage not to reach requirement, under the extended overvoltage situation, can decay by speed-up condenser, cause reactive power compensation not meet the requirement of power supply administration.
As preferably, in the tuning circuit of tuning triple-frequency harmonics, the voltage rise V that reactor produces
LBe system voltage V
S14.8%.Tuning quintuple harmonics tuning circuit in, the voltage rise V that reactor produces
LBe system voltage V
S6%.Since the reactor that in tuning three times, the tuning circuit of quintuple harmonics, is connected in series respectively the reactance of power taking container 14.8% and 6%, then when considering that capacitor is withstand voltage, should count the voltage rise of corresponding reactor 14.8% and 6% respectively.
As preferably, harmonic voltage V
HBe system voltage V
S10.5%.This setting is to draw according to the regulation to harmonic voltage in the GB.
As preferably, in the tuning circuit of tuning triple-frequency harmonics, harmonic voltage V
HBe system voltage V
S0.3%; In the tuning circuit of tuning five times and the seventh harmonic, as system voltage V
SWhen being lower than 1000V, harmonic voltage V
HBe system voltage V
S5%, as system voltage V
SWhen being higher than 1000V, harmonic voltage V
HBe system voltage V
S3%.This setting is to draw according to the relevant regulations to harmonic voltage among the IEEE519.
As preferably, in the tuning circuit of tuning nth harmonic, the anti-stream of reactor is the withstand voltage V of the capacitor that is electrically connected with reactor
nImpedance Z with tuning circuit
nThe merchant of the two.When not having harmonic wave in the system for distribution network of power, I
1=V
S/ Z
1, V wherein
SSystem voltage; When having triple-frequency harmonics, I
3=V
3/ Z
3, the rest may be inferred for the situation of five times and the seventh harmonic.
Because the employing of technique scheme the utlity model has following advantage:
The coupling that the utility model is correct reactor and capacitor, avoided owing to withstand voltage deficiency of capacitor and the not enough serious consequence that causes of the anti-stream of reactor, it is a kind of tuned filter with good capacitor and inductor matching properties, capacitor voltage endurance and the anti-properties of flow of reactor, both can compensation harmonic, again can compensating power, concrete, when there was harmonic wave in electrical network, the tuned filter that is composed in series by capacitor and reactor provided reactive power and can not amplify harmonic wave for electric power system under fundamental frequency; When harmonic source equipment produced harmonic wave, the LC tuned filter that is composed in series by capacitor and reactor formed low-impedance path to harmonic wave, to absorb harmonic wave, had satisfied the requirement of electric power system to harmonic wave and reactive power simultaneously.Effectively purify electric network pollution, also improved power supply quality simultaneously.
Description of drawings
Accompanying drawing 1 is the circuit diagram of one group of tuning circuit of the utility model.
Embodiment
Below by embodiment, the technical solution of the utility model is further described in detail.
Embodiment 1
A kind of tuned filter comprises at least one group of tuning circuit, and tuning circuit comprises capacitor, the reactor that is connected with capacitor electrode, and in every group of tuning circuit, the resonance frequency of capacitor and reactor is less than the 3rd subharmonic resonance frequency of system.Capacitor and reactor are connected in series.Electric capacity withstand voltage greater than system voltage V
S, the voltage rise V that produces of reactor
LAnd harmonic voltage V
HThree's sum.
In the tuning circuit of tuning triple-frequency harmonics, the reactance of reactor is 14.8% of a condenser reactance.Accordingly, the voltage rise V of reactor generation
LBe system voltage V
S14.8%.Harmonic voltage V
HBe system voltage V
S10.5%.The anti-stream of reactor is the withstand voltage V of the capacitor that is electrically connected with reactor
3Impedance Z with tuning circuit
3The merchant of the two.
Embodiment 2
A kind of tuned filter comprises at least one group of tuning circuit, and tuning circuit comprises capacitor, the reactor that is connected with capacitor electrode, and in every group of tuning circuit, the resonance frequency of capacitor and reactor is less than the 5th harmonic resonance frequency of system.Capacitor and reactor are connected in series.Electric capacity withstand voltage greater than system voltage V
S, the voltage rise V that produces of reactor
LAnd harmonic voltage V
HThree's sum.
In the tuning circuit of tuning quintuple harmonics, the reactance of reactor is 6% of a condenser reactance.Accordingly, the voltage rise V of reactor generation
LBe system voltage V
S6%.Harmonic voltage V
HBe system voltage V
S10.5%.The anti-stream of reactor is the withstand voltage V of the capacitor that is electrically connected with reactor
5Impedance Z with tuning circuit
5The merchant of the two.
Embodiment 3
In the tuning circuit of tuning triple-frequency harmonics, harmonic voltage V
HBe system voltage V
S0.3%.
In the tuning circuit of tuning five times and the seventh harmonic, as system voltage V
SWhen being lower than 1000V, harmonic voltage V
HBe system voltage V
S5%, as system voltage V
SWhen being higher than 1000V, harmonic voltage V
HBe system voltage V
S3%
Claims (10)
1. tuned filter, it is characterized in that: it comprises at least one group of tuning circuit, described tuning circuit comprises capacitor, the reactor that is connected with described capacitor electrode, in every group of described tuning circuit, the resonance frequency of described capacitor and reactor is less than the nth harmonic resonance frequency of system.
2. tuned filter according to claim 1 is characterized in that: in the described tuning circuit of tuning triple-frequency harmonics, the reactance of described reactor is 14.8% of a described condenser reactance.
3. tuned filter according to claim 1 is characterized in that: in the described tuning circuit of tuning quintuple harmonics, the reactance of described reactor is 6% of a described condenser reactance.
4. tuned filter according to claim 1 is characterized in that: described capacitor and described reactor are connected in series.
5. tuned filter according to claim 4 is characterized in that: withstand voltage the voltage rise VL and the harmonic voltage VH three sum greater than system voltage VS, the generation of described reactor of described electric capacity.
6. tuned filter according to claim 5 is characterized in that: in the described tuning circuit of tuning triple-frequency harmonics, the voltage rise VL that described reactor produces is 14.8% of described system voltage VS.
7. tuned filter according to claim 5 is characterized in that: in the described tuning circuit of tuning quintuple harmonics, the voltage rise VL that described reactor produces is 6% of described system voltage VS.
8. tuned filter according to claim 5 is characterized in that: described harmonic voltage VH is 10.5% of described system voltage VS.
9. tuned filter according to claim 5 is characterized in that: in the described tuning circuit of tuning triple-frequency harmonics, harmonic voltage VH is 0.3% of system voltage VS; In the described tuning circuit of tuning five times and the seventh harmonic, when system voltage VS was lower than 1000V, harmonic voltage VH was 5% of system voltage VS, and when system voltage VS was higher than 1000V, harmonic voltage VH was 3% of system voltage VS.
10. tuned filter according to claim 1, it is characterized in that: in the described tuning circuit of tuning nth harmonic, the anti-stream of described reactor is the two the merchant of impedance Z n of the withstand voltage Vn of the capacitor that is electrically connected with described reactor and described tuning circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203034517U CN201417951Y (en) | 2009-05-22 | 2009-05-22 | Tunable filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203034517U CN201417951Y (en) | 2009-05-22 | 2009-05-22 | Tunable filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201417951Y true CN201417951Y (en) | 2010-03-03 |
Family
ID=41794380
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009203034517U Expired - Fee Related CN201417951Y (en) | 2009-05-22 | 2009-05-22 | Tunable filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201417951Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103401244A (en) * | 2013-08-14 | 2013-11-20 | 北京盈频数码科技有限责任公司 | Harmonic suppression circuit for electromagnetic compatibility laboratory and compensation method thereof |
| CN104322153A (en) * | 2012-06-18 | 2015-01-28 | 株式会社京三制作所 | High-frequency power supply device and ignition voltage selection method |
| CN108336736A (en) * | 2018-02-23 | 2018-07-27 | 上海圣缑电磁设备有限公司 | Resonant mode electrical passive filter and its adjusting method |
-
2009
- 2009-05-22 CN CN2009203034517U patent/CN201417951Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104322153A (en) * | 2012-06-18 | 2015-01-28 | 株式会社京三制作所 | High-frequency power supply device and ignition voltage selection method |
| EP2833702A4 (en) * | 2012-06-18 | 2015-08-05 | Kyosan Electric Mfg | High-frequency power supply device and ignition voltage selection method |
| CN103401244A (en) * | 2013-08-14 | 2013-11-20 | 北京盈频数码科技有限责任公司 | Harmonic suppression circuit for electromagnetic compatibility laboratory and compensation method thereof |
| CN103401244B (en) * | 2013-08-14 | 2015-04-01 | 潘奇 | Harmonic suppression circuit for electromagnetic compatibility laboratory and compensation method thereof |
| CN108336736A (en) * | 2018-02-23 | 2018-07-27 | 上海圣缑电磁设备有限公司 | Resonant mode electrical passive filter and its adjusting method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100303 Termination date: 20120522 |