CN203660535U - Hybrid passive power filter - Google Patents
Hybrid passive power filter Download PDFInfo
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- CN203660535U CN203660535U CN201320877445.9U CN201320877445U CN203660535U CN 203660535 U CN203660535 U CN 203660535U CN 201320877445 U CN201320877445 U CN 201320877445U CN 203660535 U CN203660535 U CN 203660535U
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- passive electric
- reactor
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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
The utility model discloses a hybrid passive power filter. The hybrid passive power filter includes a series-connection passive power filtering unit which is connected in series between a power system and a load or a microgrid, and a parallel-connection passive power filtering unit which is connected in parallel with the load or the microgrid; the series-connection passive power filtering unit is used for allowing fundamental waves to pass through and isolating harmonic waves; the parallel-connection passive power filtering unit is used for filtering the harmonic waves and performing passive power compensation on the fundamental waves; the series-connection passive power filtering unit includes a first reactor and a first capacitor which are in series connection; the parallel-connection passive power filtering unit includes a second reactor and a second capacitor which are connected in parallel; the first reactor and the first capacitor are design to be in series resonance for the fundamental waves; the second reactor and the second capacitor are design to be in series resonance for lowest harmonic waves (or background harmonic waves); the parallel-connection passive power filtering unit is in extremely low impedance for the lowest harmonic waves and is in lower impedance for other harmonic waves; and therefore, a pathway is provided for the harmonic waves, and the harmonic waves can be filtered.
Description
Technical field
The utility model belongs to electric filtering technical field, more specifically, relates to a kind of hybrid passive electric-power filter.
Background technology
Technics of Power Electronic Conversion device is topmost harmonic source in current electric power system, is subject to the impact of harmonic source and system impedance, and the bus of harmonic source parallel connection and more will contain certain background harmonics on the bus of voltage levels.The inverter that new forms of energy access electrical network adopts also can produce background harmonics, and the harmonic wave permeability of traditional electrical network and distributed power source and micro-grid system is more and more higher.Installing electric-power filter additional is one of effective ways that solve Harmonious Waves in Power Systems, and electric-power filter is generally divided into passive power filter and Active Power Filter-APF.Passive power filter is divided into again traditional passive power filter in parallel and series connection passive power filter.Traditional passive power filter refers in particular to by the appropriately combined filter forming of power capacitor, reactor and resistor, is a kind of passive power filter in parallel, and its typical representative is exactly single tuning LC filter.This tradition passive power filter in parallel is to use at present the most extensive and ripe harmonic wave to suppress means.It is the series connection passive power filter that adopts LC parallel resonance that series connection passive power filter is studied more in the world, the series connection passive power filter of this employing LC parallel resonance is the dual mode of traditional passive power filter in parallel, so in order to isolate harmonic wave multiple passive power filters based on LC parallel resonance of will connecting, systematic comparison complexity.
Passive power filter in parallel and series connection passive power filter can be combined to formation connection in series-parallel hybrid passive electric-power filter in practice.The utility model relevant to connection in series-parallel hybrid passive electric-power filter mainly contains two classes: (1) " harmonic suppression apparatus (Granted publication number is CN1167177C) " and " hybrid power filter (Granted publication number is CN100555794C) ", these two kinds of harmonic suppression apparatus are to grow up on the basis of the method and system of the serial active filter based on fundamental flux compensation " (utility model application number: 99120103.5) ", form so-called " zero magnetic flux current transformer " so wherein must comprise a transformer.(2) " a kind of series-parallel isolation passive power filter (Granted publication number is CN100541967C) ", in these application documents, passive power filter part the second capacitor in parallel and the second reactor are to first-harmonic resonance, the second capacitor and the second reactor almost bear whole fundamental voltages, so the capacity relative of reactor and power capacitor is larger.Because whole passive power filter in parallel has two resonance points, add that reactor is not ideal inductance (can contain certain resistance components) simultaneously, tuning more difficult.
Utility model content
For above defect or the Improvement requirement of prior art, the purpose of this utility model is to provide a kind of hybrid passive electric-power filter simple in structure, solves thus the very little and too many technical problem of passive power filter branch road of filter system harmonic impedance.
The utility model provides a kind of hybrid passive electric-power filter, comprises the passive electric filtering unit of connecting being connected between electric power system and load or microgrid, and the in parallel passive electric filtering unit in parallel with described load or microgrid; Described series connection passive electric filtering unit is used for making first-harmonic to pass through and harmonic wave is isolated; Described passive electric filtering in parallel unit is for filtering harmonic wave and first-harmonic is carried out to reactive power compensation.
The utility model provides a kind of hybrid passive electric-power filter, comprises the passive electric filtering unit of connecting being connected between electric power system and load or microgrid, and the in parallel passive electric filtering unit in parallel with described electric power system; Described series connection passive electric filtering unit is used for making first-harmonic to pass through and harmonic wave is isolated; Described passive electric filtering in parallel unit is for filtering harmonic wave and first-harmonic is carried out to reactive power compensation.
Wherein, described hybrid passive electric-power filter also comprises transformer T, and the high-pressure side of described transformer T is connected with described series connection passive electric filtering unit, and the low-pressure side of described transformer T is connected with described passive electric filtering in parallel unit.
Wherein, described series connection passive electric filtering unit comprises the first reactor L being connected in series successively
1with the first capacitor C
1, described the first reactor L
1non-be connected in series end be connected with described electric power system, described the first capacitor C
1non-be connected in series end be connected with described load or microgrid.
Wherein, described series connection passive electric filtering unit comprises the first capacitor C being connected in series successively
1with the first reactor L
1, described the first capacitor C
1non-be connected in series end be connected with described electric power system, described the first reactor L
1non-be connected in series end be connected with described load or microgrid.
Wherein, the inductance value L of described the first reactor
1capacitance C with described the first capacitor
1meet relational expression ω L
1=1/ (ω C
1), ω is the angular frequency of electric power system first-harmonic.
Wherein, described passive electric filtering in parallel unit comprises the second reactor L being connected in series successively
2with the second capacitor C
2, described the second reactor L
2the non-end that is connected in series be connected to the link of described series connection passive electric filtering unit and described load or microgrid; Described the second capacitor C
2non-be connected in series end ground connection.
Wherein, described passive electric filtering in parallel unit comprises the second capacitor C being connected in series successively
2with the second reactor L
2, described the second capacitor C
2the non-end that is connected in series be connected to the link of described series connection passive electric filtering unit and described load or microgrid; Described the second reactor L
2non-be connected in series end ground connection.
Wherein, the inductance value L of described the second reactor
2capacitance C with described the second capacitor
2meet relational expression n ω L
2=1/ (n ω C
2), the harmonic number that n is minimum subharmonic, ω is the angular frequency of electric power system first-harmonic.
In the utility model, series connection part improves system harmonic impedance, and part in parallel presents Low ESR to minimum subharmonic, and other subharmonic are also presented compared with Low ESR, has simplified the design of passive power filter in parallel.
Brief description of the drawings
Fig. 1 is the structural representation of connection in series-parallel hybrid passive electric-power filter;
Fig. 2 is that second of connection in series-parallel hybrid passive electric-power filter is implemented structural representation;
Fig. 3 be connection in series-parallel hybrid passive electric-power filter be applied to distributed power generation or micro-grid system time structural representation.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.In addition,, in each execution mode of described the utility model, involved technical characterictic just can combine mutually as long as do not form each other conflict.
The utility model embodiment combines the series connection passive power filter based on LC series resonance and traditional passive power filter in parallel, draw another kind of connection in series-parallel hybrid passive electric-power filter, its basic circuit is as Fig. 1, comprise the passive electric filtering unit 3 of connecting being connected between electric power system 1 and load or microgrid 2, and the in parallel passive electric filtering unit 4 in parallel with described load or microgrid 2; Series connection passive electric filtering unit 3 is for passing through first-harmonic and harmonic wave being isolated; Passive electric filtering in parallel unit 4 carries out reactive power compensation for filtering harmonic wave and to first-harmonic.
In the utility model embodiment, series connection passive electric filtering unit 3 is connected in the middle of electric power system 1 (comprising the electric power system of naval vessel, aerospace system and low-and high-frequency) and harmonic load 2, electric power system 1 and microgrid 2 (or distributed power source), first-harmonic is presented utmost point Low ESR, harmonic wave is presented to higher resistance, make first-harmonic substantially not affect smoothly and to pass through, harmonic wave is played (comprising diversity of settings harmonic wave) to the effect of isolation.The minimum subharmonic series resonance of passive electric filtering in parallel unit 4 to wanted filtering, minimum subharmonic is presented to utmost point Low ESR, other subharmonic are compared with Low ESR, the harmonic wave that load is produced almost all flows into this parallel connection passive electric filtering unit 4, realize the filtering to harmonic wave, can also carry out reactive power compensation to first-harmonic simultaneously.
Wherein, series connection passive electric filtering unit 3 comprises the first reactor L being connected in series successively
1with the first capacitor C
1, the first reactor L
1non-be connected in series end be connected with electric power system 1, the first capacitor C
1the non-end that is connected in series be connected with load or microgrid 2.Passive electric filtering in parallel unit 4 comprises the second reactor L being connected in series successively
2with the second capacitor C
2, the second reactor L
2the non-link that is connected in series end and is connected to series connection passive electric filtering unit 3 and load or microgrid 2; The second capacitor C
2non-be connected in series end ground connection.
In the utility model embodiment, the first reactor L
1with the first capacitor C
1coupled in series, the first reactor L
1with the first capacitor C
1be designed to fundamental series resonance ω L
1=1/ (ω C
1), wherein L
1be the first reactor L
1inductance value, C
1be the first capacitor C
1capacitance; The first capacitor C
1with the first reactor L
1be cascaded and formed series connection passive electric filtering unit 3, this series connection passive electric filtering unit 3 is connected in the middle of electric power system 1 and harmonic load 2, electric power system 1 and microgrid 2 (or distributed power source), plays isolation harmonic wave (comprising diversity of settings harmonic wave).The second reactor L
2with the second capacitor C
2coupled in series, the second reactor L
2with the second capacitor C
2be designed to the minimum subharmonic series resonance that harmonic source is produced, n ω L
2=1/ (n ω C
2) (in formula, the harmonic number that n is minimum subharmonic, ω is the angular frequency of electric power system first-harmonic, L
2be the second reactor L
2inductance value, C
2be the second capacitor C
2capacitance).The second reactor L
2with the second capacitor C
2after being cascaded, be parallel in system, formed passive electric filtering in parallel unit 4.
In the utility model embodiment, the first reactor L
1with the first capacitor C
1for fundamental series resonance, the first reactor L
1with the first capacitor C
1be cascaded and formed series connection passive electric filtering unit 3.The second reactor L
2with the second capacitor C
2be designed to the minimum subharmonic series resonance that harmonic source is produced, the second reactor L
2with the second capacitor C
2after being cascaded, be parallel in system, formed passive electric filtering in parallel unit 4.The series connection passive electric filtering unit 3 of this connection in series-parallel hybrid passive electric-power filter does not comprise so-called " zero magnetic flux current transformer " or other transformers, and its passive power filter in parallel adopts traditional single tuning passive power filter in parallel.
Series connection passive electric filtering of the present utility model unit 3 presents utmost point Low ESR, harmonic wave is presented to higher resistance first-harmonic.Passive electric filtering in parallel unit 4 is utmost point Low ESR, other harmonic waves is presented compared with Low ESR the minimum subharmonic of wanted filtering, for harmonic wave provides path, has realized the filtering to harmonic wave.Passive electric filtering in parallel unit 4 can adopt star connection and delta connection.
The utility model can be applied in high-low pressure single phase system, three-phase system, three-phase four-wire system or polyphase system, can be also power frequency for fundamental frequency, the electric power system of intermediate frequency and high frequency.
The utility model can adopt execution mode as shown in Figure 2 to connect, and is about to series connection passive electric filtering unit 3 and is connected on the high-pressure side of transformer T, and passive electric filtering in parallel unit 4 is connected on to the low-pressure side of transformer T.In order to adapt to the background harmonics in traditional electrical network, distributed power generation combining inverter, micro-grid system, can adopt execution mode as shown in Figure 3 to connect, from harmonic source sidesway to electric power system side, realize the inhibition of the background harmonics to electric power system (comprising microgrid and distributed power generation etc.) by passive electric filtering in parallel unit 4.
For system stability, series connection passive electric filtering unit 3 and passive electric filtering in parallel unit 4 can take off humorous design, allow reactor value little by little larger a little than resonance value; Because when reactor value is slightly larger than resonance value, this passive power filter 2 is also emotional resistance to first-harmonic, is conducive to system stability.The independent use of series reactor in system can also be played the effect of current limliting, i.e. when system starting, by capacitor short-circuit, complete when starting, then capacitor is dropped into.In addition, capacitor also will increase the GPF (General Protection False elements such as discharge coil.Can also increase capacitor or other LC passive power filter in order to carry out reactive power compensation in grid side or harmonic load side.
As optimization of the present utility model, above-mentioned common reactor all can adopt adjustable reactor, carries out automatic tuning with convenient system parameters while changing.
The utility model difference maximum with prior art (a kind of series-parallel isolation passive power filter) is passive power filter part in parallel, the utility model passive part in parallel is except having the filter function of a kind of series-parallel isolation passive power filter (Granted publication number is CN100541967C), can also carry out reactive power compensation to first-harmonic according to actual needs, structure is simpler simultaneously, tuning convenience, reduced by a reactor, and the possibility of system or harmonic load generation resonance is less.
For the hybrid passive electric-power filter that further description the utility model embodiment provides, below in conjunction with accompanying drawing and example, the utility model is further described.
Shown in Fig. 1, the utility model is by the first reactor L
1, the second reactor L
2, the first capacitor C
1with the second capacitor C
2form.The first reactor L
1with the first capacitor C
1coupled in series, the first reactor L
1with the first capacitor C
1be designed to fundamental series resonance ω L
1=1/ (ω C
1).The first capacitor C
1with the first reactor L
1be cascaded and formed series connection passive electric filtering unit 3.This series connection passive electric filtering unit 3 is connected on electric power system 1 and harmonic load 2 (or microgrid, or distributed power source) in the middle of, first-harmonic is presented utmost point Low ESR, harmonic wave is presented to higher resistance, play isolation harmonic wave (comprising diversity of settings harmonic wave).The second reactor L
2with the second capacitor C
2coupled in series, the second reactor L
2with the second capacitor C
2be designed to the minimum subharmonic series resonance that harmonic source is produced, n ω L
2=1/ (n ω C
2) (in formula, the harmonic number that n is minimum subharmonic).The second reactor L
2with the second capacitor C
2after being cascaded, be parallel in system, formed passive electric filtering in parallel unit 4.Passive electric filtering in parallel unit 4 is utmost point Low ESR, other harmonic waves is presented compared with Low ESR minimum subharmonic, for harmonic wave provides path, has realized the filtering to harmonic wave, can also carry out reactive power compensation to first-harmonic simultaneously.
The utility model can adopt execution mode as shown in Figure 2 to connect, and is about to series connection passive electric filtering unit 3 and is connected on the high-pressure side of transformer T, and passive electric filtering in parallel unit 4 is connected on to the low-pressure side of transformer T.In order to adapt to the background harmonics in traditional electrical network, distributed power generation combining inverter, micro-grid system, can adopt execution mode as shown in Figure 3 to connect, from harmonic source sidesway to electric power system side, realize the inhibition of the background harmonics to electric power system (comprising microgrid and distributed power generation etc.) by passive electric filtering in parallel unit 4.Passive electric filtering in parallel unit 4 can adopt star connection and delta connection.
For system stability, series connection passive electric filtering unit 3 and passive electric filtering in parallel unit 4 can take off humorous design, allow reactor value little by little larger a little than resonance value.The independent use of series reactor in system can also be played the effect of current limliting, i.e. when system starting, by capacitor short-circuit, complete when starting, then capacitor is dropped into.In addition, power capacitor also will increase the GPF (General Protection False elements such as discharge coil.Can also increase capacitor or other LC passive power filter in order to carry out reactive power compensation in grid side or harmonic load side.
The utility model can be applied in high-low pressure single phase system, three-phase system, three-phase four-wire system or polyphase system.Also can be power frequency for fundamental frequency, the electric power system of intermediate frequency and high frequency.
In the utility model embodiment, the first reactor L in series connection passive electric filtering unit 3
1with the first capacitor C
1can transposition, the second reactor L in passive electric filtering in parallel unit 4
2with the second capacitor C
2also can transposition.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any amendments of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (9)
1. a hybrid passive electric-power filter, it is characterized in that, comprise the passive electric filtering unit (3) of connecting being connected between electric power system (1) and load or microgrid (2), and the in parallel passive electric filtering unit (4) in parallel with described load or microgrid (2);
Described series connection passive electric filtering unit (3) is for passing through first-harmonic and harmonic wave being isolated;
Described passive electric filtering in parallel unit (4) carries out reactive power compensation for filtering harmonic wave and to first-harmonic.
2. a hybrid passive electric-power filter, it is characterized in that, comprise the passive electric filtering unit (3) of connecting being connected between electric power system (1) and load or microgrid (2), and the in parallel passive electric filtering unit (4) in parallel with described electric power system (1);
Described series connection passive electric filtering unit (3) is for passing through first-harmonic and harmonic wave being isolated;
Described passive electric filtering in parallel unit (4) carries out reactive power compensation for filtering harmonic wave and to first-harmonic.
3. hybrid passive electric-power filter as claimed in claim 1 or 2, it is characterized in that, described hybrid passive electric-power filter also comprises transformer T, the high-pressure side of described transformer T is connected with described series connection passive electric filtering unit (3), and the low-pressure side of described transformer T is connected with described passive electric filtering in parallel unit (4).
4. hybrid passive electric-power filter as claimed in claim 3, is characterized in that, described series connection passive electric filtering unit (3) comprises the first reactor L being connected in series successively
1with the first capacitor C
1, described the first reactor L
1non-be connected in series end be connected with described electric power system (1), described the first capacitor C
1non-be connected in series end be connected with described load or microgrid (2).
5. hybrid passive electric-power filter as claimed in claim 3, is characterized in that, described series connection passive electric filtering unit (3) comprises the first capacitor C being connected in series successively
1with the first reactor L
1, described the first capacitor C
1non-be connected in series end be connected with described electric power system (1), described the first reactor L
1non-be connected in series end be connected with described load or microgrid (2).
6. hybrid passive electric-power filter as claimed in claim 4, is characterized in that, the inductance value L of described the first reactor
1capacitance C with described the first capacitor
1meet relational expression ω L
1=1/ (ω C
1), ω is the angular frequency of electric power system first-harmonic.
7. hybrid passive electric-power filter as claimed in claim 3, is characterized in that, described passive electric filtering in parallel unit (4) comprises the second reactor L being connected in series successively
2with the second capacitor C
2, described the second reactor L
2the non-link that is connected in series end and is connected to described series connection passive electric filtering unit (3) and described load or microgrid (2); Described the second capacitor C
2non-be connected in series end ground connection.
8. hybrid passive electric-power filter as claimed in claim 3, is characterized in that, described passive electric filtering in parallel unit (4) comprises the second capacitor C being connected in series successively
2with the second reactor L
2, described the second capacitor C
2the non-link that is connected in series end and is connected to described series connection passive electric filtering unit (3) and described load or microgrid (2); Described the second reactor L
2non-be connected in series end ground connection.
9. hybrid passive electric-power filter as claimed in claim 7, is characterized in that, the inductance value L of described the second reactor
2capacitance C with described the second capacitor
2meet relational expression n ω L
2=1/ (n ω C
2), the harmonic number that n is minimum subharmonic, ω is the angular frequency of electric power system first-harmonic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320877445.9U CN203660535U (en) | 2013-12-27 | 2013-12-27 | Hybrid passive power filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320877445.9U CN203660535U (en) | 2013-12-27 | 2013-12-27 | Hybrid passive power filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203660535U true CN203660535U (en) | 2014-06-18 |
Family
ID=50926889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320877445.9U Expired - Fee Related CN203660535U (en) | 2013-12-27 | 2013-12-27 | Hybrid passive power filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203660535U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103746381A (en) * | 2013-12-27 | 2014-04-23 | 华中科技大学 | Hybrid passive power filter |
| WO2021227269A1 (en) * | 2020-05-15 | 2021-11-18 | 广东电网有限责任公司清远供电局 | Hybrid passive power filter and three-phase power system |
-
2013
- 2013-12-27 CN CN201320877445.9U patent/CN203660535U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103746381A (en) * | 2013-12-27 | 2014-04-23 | 华中科技大学 | Hybrid passive power filter |
| WO2021227269A1 (en) * | 2020-05-15 | 2021-11-18 | 广东电网有限责任公司清远供电局 | Hybrid passive power filter and three-phase power system |
| US11901733B2 (en) | 2020-05-15 | 2024-02-13 | Qingyuan Power Supply Bureau Of Guangdong Power Grid Corporation | Hybrid passive power filter and three-phase power system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140618 Termination date: 20141227 |
|
| EXPY | Termination of patent right or utility model |