CN203660534U - Passive power filter - Google Patents
Passive power filter Download PDFInfo
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- CN203660534U CN203660534U CN201320877300.9U CN201320877300U CN203660534U CN 203660534 U CN203660534 U CN 203660534U CN 201320877300 U CN201320877300 U CN 201320877300U CN 203660534 U CN203660534 U CN 203660534U
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- reactor
- capacitor
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- harmonic
- power filter
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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 passive power filter. The passive power filter includes a reactor L1 and a capacitor C1 which are connected in series; a non-series-connection end of the reactor L1 is used for connecting a power system; a non-series-connection end of the capacitor C1 is used for connecting a load or a micro grid; the reactor L1 and the capacitor C1 are in series resonance for fundamental waves of a power supply system, namely, Omega L1=1/(Omega C1); the reactor L1 and the capacitor C1 jointly form an LC series resonant passive power filter; the passive power filter is connected in series between the power system and a harmonic wave load as well as between the power system and the micro grid or a distributed power source, wherein the power system includes a ship and aerospace system and a high and low frequency power supply system, such that, a circuit which presents extremely low impedance for the fundamental waves and presents high impedance for the harmonic waves can be formed, and therefore, an harmonic wave isolation effect can be realized. The passive power filter of the utility model can be applied to a high and low-voltage single-phase system, a three-phase system, and a three-phase four-wire or poly-phase system, and can be also used for a power supply system of which the fundamental wave frequency is power frequency, intermediate frequency and high frequency.
Description
Technical field
The utility model belongs to electric filtering technical field, is specifically related to a kind of LC series connection passive power filter of independent use.
Background technology
Technics of Power Electronic Conversion device is topmost harmonic source in current electric power system, and power electronics rahmonic source is divided into voltage-type harmonic source and current mode harmonic source according to its characteristic.The rectifying device that the large smoothing reactor of connecting after rectifier bridge carrys out filtering is generally taken as current mode harmonic source.After rectifier bridge, the rectifying device of a large filtering capacitor in parallel is generally taken as voltage-type harmonic source.In practical matter, the characteristic of harmonic source may be between voltage-type harmonic source and current mode harmonic source, as the rectifying device of a large filtering capacitor in parallel or the system that load itself comprises multiple harmonic source again after the inductance of first connecting after rectifier bridge, such harmonic source can be defined as mixed harmonic source.
Be subject to the impact of harmonic source and system impedance, and the bus of harmonic source parallel connection and more may 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, representational paper is: F.Z.Peng, Gui-Jia Su, G Farquharson.A series LC filter for harmonic compensation of AC drives, PESC99.30th Annual IEEE Power Electronics Specialists Conference, vol.1, pp.213-218,1999.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.
Utility model content
For above defect or the Improvement requirement of prior art, the purpose of this utility model has been to provide a kind of structure very simply and first-harmonic has not been had to influential passive power filter substantially, has solved the very little technical problem of system harmonic impedance.
The utility model provides a kind of passive power filter, comprises the reactor L being connected in series successively
1with capacitor C
1, described reactor L
1non-be connected in series end for being connected with electric power system, described capacitor C
1non-be connected in series end for being connected with load or microgrid; Described passive power filter is for the fundamental series resonance to electric power system, the inductance value L of described reactor
1capacitance C with capacitor
1meet relational expression ω L1=1/ (ω C
1); ω is the angular frequency of electric power system first-harmonic.
The utility model provides a kind of passive power filter, comprises the reactor L being connected in series successively
1with capacitor C
1, described reactor L
1non-be connected in series end for being connected with load or microgrid, described capacitor C
1non-be connected in series end for being connected with electric power system; Described passive power filter is for the fundamental series resonance to electric power system, the inductance value L of described reactor
1capacitance C with capacitor
1meet relational expression ω L
1=1/ (ω C
1); ω is the angular frequency of electric power system first-harmonic.
Wherein, described reactor L
1for the adjustable Regulatable reactor L of inductance value
1.
The utility model adopts structure very simple passive power filter to solve problem that system harmonic impedance is very little, harmonic wave is rendered as to induction reactance can not cause resonance, and circuit parameter is few, so be easy to by reasonably avoiding possible resonance point.
Brief description of the drawings
Fig. 1 is that the passive power filter that the utility model embodiment provides is applied in the structural representation between electric power system and load;
Fig. 2 is that the passive power filter that the utility model embodiment provides is applied in the structural representation between electric power system and microgrid;
Fig. 3 is the existing phase current waveform (0.01s/div, 500A/div) of system while not adding any filter;
Fig. 4 is the phase current waveform (0.01s/div, 200A/div) that increases system after the passive power filter that the utility model embodiment provides;
Fig. 5 is system voltage Vsys and the capacitor voltage at both ends Vcapacitor waveform (0.01s/div, 200V/div) after passive power filter of adding that increases that the utility model embodiment provides.
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 one of series connection in the middle of electric power system (comprising the electric power system of naval vessel, aerospace system and low-and high-frequency) and harmonic load or electric power system and microgrid (or distributed power source) presents utmost point Low ESR, harmonic wave is presented to the circuit of higher resistance first-harmonic, make first-harmonic substantially not affect smoothly and to pass through, harmonic wave is played to the effect of isolation.
The structure of the passive power filter that the utility model embodiment provides as shown in Figure 1, for convenience of explanation, only shows the part relevant to the utility model embodiment, and details are as follows:
In the utility model embodiment, system is to first-harmonic resonance, i.e. ω L
1=1/ (ω C
1), ω is the angular frequency of electric power system first-harmonic; At this moment the first-harmonic equiva lent impedance Z of passive power filter 2
(1)be zero, and passive power filter 2 is Z to the impedance of nth harmonic
(n)=jn ω L
1+ 1/ (jn ω C
1)=j ω L
1(n
2-1)/n ≈ jn ω L
1, harmonic wave is presented to higher induction reactance, be conducive to system stability.In conventional design, series capacitor is more prudent in the line, because so easy initiation resonance.The passive power filter in parallel of in fact current the most widely used routine (general many group single tuning branch roads and the one group of high-pass filtering branch road of adopting) is also easy to cause resonance, so will carry out appropriate design and resonance phenomena is avoided in optimization.The utility model has been broken through conventional design, is not the power capacitor of only connecting separately, but by a power capacitor C
1with a reactor L
1series connection, power capacitor C
1with reactor L
1to first-harmonic resonance (also can carry out off-tune design), so just first-harmonic is not affected substantially, harmonic wave is presented to higher emotional resistance, play the effect of harmonic wave isolation.This passive power filter 2 presents higher emotional resistance to harmonic wave, add system parameters less, be very beneficial for system, avoid possible resonance point, can play the starting current of restriction load 3 by rational input and this passive power filter 2 of excision order.Capacitor first-harmonic capacity and reactor first-harmonic capacity are larger, and harmonic wave isolation effect is better, but capacity can not be too large, are generally less than 10 times of power system capacity.
The passive power filter that the utility model embodiment provides is a kind of passive power filter based on LC series resonance of independent use, wherein reactor L
1with capacitor C
1for fundamental series resonance, reactor L
1with capacitor C
1be connected between electrical network and harmonic source, play isolation harmonic wave.This series connection passive power filter does not comprise so-called " zero magnetic flux current transformer " and any passive power filter in parallel.This filter is applicable to the filtering of voltage-type harmonic source very much, also can be for the filtering of mixed harmonic source and current mode harmonic source.
The utility model embodiment does not comprise so-called " zero magnetic flux current transformer " and any passive power filter in parallel.This filter presents utmost point Low ESR, harmonic wave is presented to higher resistance first-harmonic.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, capacitor first-harmonic capacity and reactor first-harmonic capacity are larger, harmonic wave isolation effect is better, as in a typical three-phase voltage type harmonic source system, in the time that system power is 273A, while not adding any filter, the phase current waveform of system is (THD is 100.9%) as shown in Figure 3, when adding passive power filter 2 (reactor L
1with capacitor C
1be respectively 3mH and 3380uF), the current waveform of system is (THD is 4.45%) as shown in Figure 4, capacitor C
1the voltage Vsys amplitude of the voltage Vcapacitor at two ends and system approaches and equates, the voltage at system voltage and capacitor two ends as shown in Figure 5.When the inductance value of reactor increases, its Equivalent Harmonic impedance increases, and filter effect also can be better, and still the at this moment also corresponding increase of capacity of reactor and capacitor, can increase cost.Except first-harmonic capacity, harmonic voltage drops on reactor substantially, so can suitably increase the capacity of reactor under the condition of inductance value that does not change reactor, the capacity of increase depends on harmonic content in system.
For system stability, LC series resonance can take off humorous processing, allows 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 conventional 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 can adopt adjustable reactor; While changing with convenient system parameters, carry out automatic tuning.
For the passive power filter that further description the utility model embodiment provides, below in conjunction with accompanying drawing and instantiation, the utility model is further described.
Shown in Fig. 1, Fig. 2, the utility model is by a reactor L
1with a capacitor C
1form reactor L
1with capacitor C
1coupled in series, reactor L
1with capacitor C
1for the fundamental series resonance of electric power system, i.e. ω L
1=1/ (ω C
1).Reactor L
1with capacitor C
1form together the passive power filter of LC series resonance, this passive power filter 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 3, electric power system 1 and microgrid 4 (or distributed power source), plays isolation harmonic wave.Wherein microgrid 4 is concepts for relatively traditional large electrical network, means that multiple distributed power sources and related load thereof are according to the network of certain topological structure composition, and is associated to conventional electrical network by static switch.
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.
The passive power filter based on LC series resonance of the independent use the utility model proposes comprises a reactor L
1with a capacitor C
1, reactor L
1with capacitor C
1coupled in series, reactor L
1with capacitor C
1for the fundamental series resonance of electric power system, i.e. ω L
1=1/ (ω C
1).Reactor L
1with capacitor C
1form together the passive power filter of LC series resonance, this passive power filter 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 4 (or distributed power source), plays isolation harmonic wave.
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 (3)
1. a passive power filter, is characterized in that, comprises the reactor L being connected in series successively
1with capacitor C
1, described reactor L
1non-be connected in series end for being connected with electric power system, described capacitor C
1non-be connected in series end for being connected with load or microgrid;
Described passive power filter is for the fundamental series resonance to electric power system, the inductance value L of described reactor
1capacitance C with capacitor
1meet relational expression ω L
1=1/ (ω C
1); ω is the angular frequency of electric power system first-harmonic.
2. a passive power filter, is characterized in that, comprises the reactor L being connected in series successively
1with capacitor C
1, described reactor L
1non-be connected in series end for being connected with load or microgrid, described capacitor C
1non-be connected in series end for being connected with electric power system;
Described passive power filter is for the fundamental series resonance to electric power system, the inductance value L of described reactor
1capacitance C with capacitor
1meet relational expression ω L
1=1/ (ω C
1); ω is the angular frequency of electric power system first-harmonic.
3. passive power filter as claimed in claim 1 or 2, is characterized in that, described reactor L
1for the adjustable Regulatable reactor L of inductance value
1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320877300.9U CN203660534U (en) | 2013-12-27 | 2013-12-27 | Passive power filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320877300.9U CN203660534U (en) | 2013-12-27 | 2013-12-27 | Passive power filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203660534U true CN203660534U (en) | 2014-06-18 |
Family
ID=50926888
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320877300.9U Expired - Fee Related CN203660534U (en) | 2013-12-27 | 2013-12-27 | Passive power filter |
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|---|---|
| CN (1) | CN203660534U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103746380A (en) * | 2013-12-27 | 2014-04-23 | 华中科技大学 | Passive power filter |
| CN105896540A (en) * | 2016-04-13 | 2016-08-24 | 苏州立旭智能电气有限公司 | Voltage-dividing type harmonic suppression device |
-
2013
- 2013-12-27 CN CN201320877300.9U patent/CN203660534U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103746380A (en) * | 2013-12-27 | 2014-04-23 | 华中科技大学 | Passive power filter |
| CN105896540A (en) * | 2016-04-13 | 2016-08-24 | 苏州立旭智能电气有限公司 | Voltage-dividing type harmonic suppression device |
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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 |