CN100555794C - Hybrid power filter - Google Patents
Hybrid power filter Download PDFInfo
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- CN100555794C CN100555794C CNB2007100523860A CN200710052386A CN100555794C CN 100555794 C CN100555794 C CN 100555794C CN B2007100523860 A CNB2007100523860 A CN B2007100523860A CN 200710052386 A CN200710052386 A CN 200710052386A CN 100555794 C CN100555794 C CN 100555794C
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- Prior art keywords
- current transformer
- harmonic
- filter
- series
- capacitor
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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
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Abstract
Hybrid power filter, belong to the power grid control equipment in the electrotechnics, be particularly related to the high-voltage power filter, overcome the prior art shortcoming, solve current transformer, inductance coil, capacitor over the ground or the insulation difficult point problem of the high pressure of alternate (as three-phase system) and ultra high voltage, to satisfy the requirement under high pressure and the ultra high voltage operating mode.The present invention includes current transformer formula series filter, current transformer formula series filter is made of zero magnetic flux current transformer, first-harmonic inductance coil and first-harmonic capacitor, zero windings in series of magnetic flux current transformer is in the electrical network bus, and secondary winding and first-harmonic inductance coil, first-harmonic capacitor constitute the fundamental series resonance loop jointly; Described zero magnetic flux current transformer, first-harmonic inductance coil and first-harmonic capacitor all place in the equipotential storehouse, and the equipotential storehouse is supported on the ground by porcelain insulator.Manufacturing process of the present invention is simple, cost is low, volume and weight are little, has solved the problem of described device high pressure and ultra high voltage insulation difficult point, the using value height.
Description
Technical field
The invention belongs to the power grid control equipment in the electrotechnics, particularly high-voltage power filter is used to suppress the harmonic current and the voltage of high and low pressure system.
Background technology
The Chinese invention patent application " harmonic suppression apparatus " of application number 02139029.0, be secondary base wave winding, inductance coil and capacitor by current transformer, composition is to the series resonant tank of first-harmonic, realize that current transformer once and the first-harmonic ampere-turn equilibrium between the secondary, make current transformer present Low ESR to a fundamental current, harmonic current is presented high impedance, allow fundamental current pass through smoothly, suppress the major part of harmonic current effectively.To the remainder of first harmonic electric current, adopt to be provided with and detect iron core, detect winding, computing amplification and active power filtering that driver, humorous wave winding constituted, the residue harmonic current is further offset.There is following shortcoming in this device: (1) is because winding of this current transformer and electrical network bus have getting in touch of electricity, when electrical network is in high voltage even ultra high voltage operating mode, between winding of current transformer and iron core and the secondary winding, satisfy the electric insulation requirement of high pressure even ultra high voltage, this makes current transformer manufacturing process complexity, cost height, volume and weight big, and application is restricted.When (2) electrical network is in the operating mode of low-voltage, big electric current, since once with secondary winding fundamental current ampere-turn equilibrium, the proportional increase of secondary current and primary current, and the power of inductance coil, capacitor is very big, its price is very high, volume and weight is also very big, uses also to be restricted.(3) adopt the active power filtering method that detects iron core, detection winding, computing amplification and driver, humorous wave winding formation that is provided with, the residue harmonic current is further offset, because residue harmonic current proportion is little, and the active power filtering method that detects iron core, detection winding, computing amplification and driver, humorous wave winding formation is set, its complexity and cost are all very high, reliability reduces, input-output ratio is uneconomical.
Summary of the invention
The present invention proposes a kind of hybrid power filter, overcome the prior art shortcoming, solve current transformer, inductance coil, capacitor over the ground or the insulation difficult point problem of the high pressure of alternate (as three-phase system) and ultra high voltage, to satisfy the requirement under high pressure and the ultra high voltage operating mode.
A kind of hybrid power filter of the present invention, comprise current transformer formula series filter, current transformer formula series filter is made of zero magnetic flux current transformer, first-harmonic inductance coil and first-harmonic capacitor, zero windings in series of magnetic flux current transformer is in the electrical network bus, and secondary winding and first-harmonic inductance coil, first-harmonic capacitor constitute the fundamental series resonance loop jointly; It is characterized in that:
Described zero magnetic flux current transformer, first-harmonic inductance coil and first-harmonic capacitor all place in the equipotential storehouse, and the equipotential storehouse is supported on the ground by porcelain insulator;
It also has LC passive filter in parallel, and during use, described current transformer formula series filter is arranged at the high-pressure side of transformer, and LC passive filter in parallel is arranged at the low-pressure side of transformer; Described LC passive filter in parallel is composed in parallel by K bar LC series resonance branch road, the tuning coil coil in every LC series resonance branch road and the corresponding different odd harmonics of reactance value of tuning capacitor, and K is 1～7.
Characteristics of the present invention are: the device that (1) constitutes current transformer formula series filter all places in the equipotential storehouse, and the equipotential storehouse is supported on the ground by porcelain insulator, solves the insulation on above-mentioned all devices and ground.These devices itself do not need high pressure and ultra high voltage insulating requirements over the ground, make that the current transformer manufacturing process is simple, cost is low, volume and weight is little, solved the problem of described device high pressure and ultra high voltage insulation difficult point, the using value height.(2) current transformer formula series filter, equipotential storehouse, porcelain insulator are arranged at the high-pressure side of transformer, because high side voltage height, electric current are little, the problem that voltage is high adopts equipotential storehouse, the ingenious solution of porcelain insulator; The little current transformer just of electric current formula series filter is desirable, makes zero magnetic flux current transformer, first-harmonic inductance coil, first-harmonic capacitor power little, and volume and weight reduces.(3) LC passive filter in parallel is arranged at the low-pressure side of transformer, because low-pressure side voltage is low, electric current is big, voltage is low highly beneficial to LC passive filter in parallel, can reduce the voltage and the power requirement of tuning coil coil, tuning capacitor; Electric current is meant that greatly the fundamental current of step down side is big, is not meant that LC each tuning branch current of passive filter in parallel is necessarily big, does not directly relate to the electric current and the power of tuning coil coil, tuning capacitor.
Description of drawings
Fig. 1 is the circuit diagram of one embodiment of the invention;
Fig. 2 is the circuit diagram of second embodiment of the invention.
Embodiment
Now the present invention is further described in conjunction with the accompanying drawings.
Fig. 1 is embodiments of the invention 1 schematic diagrames.Zero magnetic flux current transformer T
1A winding W
1Coupled in series is on electrical network bus 1, and electrical network bus 1 joins a winding W with electrical network 2
1The other end links to each other with transformer T high-pressure side coil one end 3.Current transformer T
1Secondary winding W
2With first-harmonic inductance coil L
1, first-harmonic capacitor C
1Coupled in series constitutes the fundamental series resonance loop, and its resonance frequency is a fundamental frequency, nonlinear load 4 and zero magnetic flux current transformer T
1A winding W
1Be in series.This moment secondary winding W
2The first-harmonic load impedance levels off to zero, ω L
1=1/ (ω C
1), be equivalent to short circuit.Because current transformer T
1Secondary fundamental magnetic potential and a fundamental magnetic potential balance each other, i.e. W
2I
2=W
1I
1f, realize zero magnetic flux current transformer T
1To a fundamental current I
1fPresent Low ESR, to harmonic current I
1hPresent high impedance, allow fundamental current pass through smoothly, effectively the elimination harmonic current.
Constitute the zero magnetic flux current transformer T of current transformer formula series filter CF
1, first-harmonic inductance coil L
1, first-harmonic capacitor C
1, all placing in the M of equipotential storehouse, equipotential storehouse M supports on the ground by porcelain insulator Z, solves the insulation on described device and ground.Equipotential storehouse M is made by metallic conductor or insulating material; Porcelain insulator Z is withstand voltage over the ground, bear the weight requirement, should meet line voltage grade and the requirement of filter total weight that series filter inserts.Described device itself does not need high pressure and ultra high voltage insulating requirements over the ground, has solved described device high pressure and ultra high voltage insulation difficult point problem thus, makes that the current transformer manufacturing process is simple, cost is low, volume and weight is little, using value is high.
Fig. 2 is embodiments of the invention 2 schematic diagrames.Be with the difference of embodiment 1: nonlinear load 4 not coupled in series at zero magnetic flux current transformer T
1A winding W
1On.Current transformer formula series filter CF, equipotential storehouse M, porcelain insulator Z are arranged at the high-pressure side H of transformer T, because high side voltage height, electric current are little, the problem that voltage is high adopts equipotential storehouse, the ingenious solution of porcelain insulator; The little current transformer just of electric current formula series filter is desirable, feasible zero magnetic flux current transformer, first-harmonic inductance coil, little, the volume and weight reduction of first-harmonic capacitor power.
In the present embodiment, LC passive filter PF in parallel is by two tuning branch road L of characteristic harmonics
nC
n, L
mC
mForm, their parallel connections are to the points of common connection 5 of transformer T low-voltage side coil one end and nonlinear load 4.The tuning branch road L of characteristic harmonics
nC
n, L
mC
mAll satisfy n time and m characteristic harmonics series resonance condition, i.e. ω
nL
n=1/ (ω
nC
n) and ω
mL
m=1/ (ω
mC
m), make n time and the impedance of m subharmonic level off to zero respectively, allow n time and the m subharmonic current passes through smoothly, reach the harmonic current I of elimination nonlinear load 4 generations
2hFlow to the purpose of transformer T.In the present embodiment, n=5, m=7.
Claims (1)
1. hybrid power filter, comprise current transformer formula series filter, current transformer formula series filter is made of zero magnetic flux current transformer, first-harmonic inductance coil and first-harmonic capacitor, zero windings in series of magnetic flux current transformer is in the electrical network bus, and secondary winding and first-harmonic inductance coil, first-harmonic capacitor constitute the fundamental series resonance loop jointly; It is characterized in that:
Described zero magnetic flux current transformer, first-harmonic inductance coil and first-harmonic capacitor all place in the equipotential storehouse, and the equipotential storehouse is supported on the ground by porcelain insulator;
It also has LC passive filter in parallel, and during use, described current transformer formula series filter is arranged at the high-pressure side of transformer, and LC passive filter in parallel is arranged at the low-pressure side of transformer; Described LC passive filter in parallel is composed in parallel by K bar LC series resonance branch road, the tuning coil coil in every LC series resonance branch road and the corresponding different odd harmonics of reactance value of tuning capacitor, and K is 1～7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100523860A CN100555794C (en) | 2007-06-06 | 2007-06-06 | Hybrid power filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100523860A CN100555794C (en) | 2007-06-06 | 2007-06-06 | Hybrid power filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101060249A CN101060249A (en) | 2007-10-24 |
| CN100555794C true CN100555794C (en) | 2009-10-28 |
Family
ID=38866194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100523860A Expired - Fee Related CN100555794C (en) | 2007-06-06 | 2007-06-06 | Hybrid power filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100555794C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102637513B (en) * | 2012-05-07 | 2015-05-13 | 上海电机学院 | Transformer capable of improving output waveforms and output waveform improving method of transformer |
| CN111426876A (en) * | 2020-03-31 | 2020-07-17 | 深圳供电局有限公司 | Harmonic monitoring device and harmonic monitoring system based on intelligent switch |
-
2007
- 2007-06-06 CN CNB2007100523860A patent/CN100555794C/en not_active Expired - Fee Related
Non-Patent Citations (2)
| Title |
|---|
| 基板磁势自平衡谐波抵消式串联有源滤波器. 杨华云，任士焱，王晓蔚，钟丹.电工技术学报，第20卷第5期. 2005 |
| 基板磁势自平衡谐波抵消式串联有源滤波器. 杨华云，任士焱，王晓蔚，钟丹.电工技术学报，第20卷第5期. 2005 * |
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| Publication number | Publication date |
|---|---|
| CN101060249A (en) | 2007-10-24 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| 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: 20091028 Termination date: 20110606 |