CN103746380A - Passive power filter - Google Patents
Passive power filter Download PDFInfo
- Publication number
- CN103746380A CN103746380A CN201310739450.8A CN201310739450A CN103746380A CN 103746380 A CN103746380 A CN 103746380A CN 201310739450 A CN201310739450 A CN 201310739450A CN 103746380 A CN103746380 A CN 103746380A
- Authority
- CN
- China
- Prior art keywords
- reactor
- capacitor
- series
- harmonic
- power filter
- 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.)
- Pending
Links
Images
Classifications
-
- 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
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The present invention discloses a passive power filter, including a reactor L1 and a capacitor C1 which are sequentially connected in series, the coupling end of the reactor L1 connected not in series is connected with an electric system, and the coupling end of the capacitor C1 connected not in series is connected with a load or a microgrid. The fundamental series resonant of the reactor L1 and the capacitor C1 to the electric system is OmegaL1=1/(OmegaC1). Both of the reactor L1 and the capacitor C1 constitute the passive power filter of theLC series resonance, the passive power filter is connected in series among the electric system (including a ship, an aerospace system and an electric system of high and low frequency) and a harmonic load, the electric system and the microgrid (or the distributed power), the circuit to the fundamental wave presenting negligible impedance and to the harmonic wave presents a higher impedance to isolate the harmonic wave. The present invention is applied in a high and low voltage single-phase system, a three-phase system, a three-phase and four-wire system or a multiphase system, also can be used in the electric system with the fundamental frequency as a power frequency, an intermediate frequency and a high frequency.
Description
Technical field
The invention belongs to electric filtering technical field, be 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, PESC 99.30th 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.
Summary of the invention
For above defect or the Improvement requirement of prior art, the object of this invention is to provide a kind of structure very simply and first-harmonic has not been had to influential passive power filter substantially, solved the very little technical problem of system harmonic impedance.
The invention provides a kind of passive power filter, comprise 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.
The invention provides a kind of passive power filter, comprise 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 present invention adopts a 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.
Accompanying drawing explanation
Fig. 1 is that the passive power filter that the embodiment of the present invention provides is applied in the structural representation between electric power system and load;
Fig. 2 is that the passive power filter that the embodiment of the present invention 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 system after the passive power filter that provides of the embodiment of the present invention is provided;
Fig. 5 increases system voltage Vsys and the capacitor voltage at both ends Vcapacitor waveform (0.01s/div, 200V/div) after passive power filter of adding that the embodiment of the present invention provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.In addition,, in each execution mode of described the present invention, involved technical characterictic just can combine mutually as long as do not form each other conflict.
The embodiment of the present invention 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 embodiment of the present invention provides as shown in Figure 1, for convenience of explanation, only shows the part relevant to the embodiment of the present invention, and details are as follows:
In embodiments of the present invention, 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 present invention has 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, played 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, by rational input and this passive power filter 2 of excision order, can play the starting current of restriction load 3.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 embodiment of the present invention 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 embodiment of the present invention 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 present invention 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 embodiments of the present invention, 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, when 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. during 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.In order to carry out reactive power compensation, in grid side or harmonic load side, can also increase capacitor or conventional LC passive power filter.
As optimization of the present invention, above-mentioned common reactor can adopt adjustable reactor; While changing with convenient system parameters, carry out automatic tuning.
The passive power filter providing for the further description embodiment of the present invention, below in conjunction with accompanying drawing and instantiation, the present invention is further illustrated.
Shown in Fig. 1, Fig. 2, the present invention 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
1formed 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 present invention 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 that the present invention 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
1formed 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 invention; not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
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 |
|---|---|---|---|
| CN201310739450.8A CN103746380A (en) | 2013-12-27 | 2013-12-27 | Passive power filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310739450.8A CN103746380A (en) | 2013-12-27 | 2013-12-27 | Passive power filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103746380A true CN103746380A (en) | 2014-04-23 |
Family
ID=50503384
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310739450.8A Pending CN103746380A (en) | 2013-12-27 | 2013-12-27 | Passive power filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103746380A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111022276A (en) * | 2019-12-27 | 2020-04-17 | 哈尔滨工业大学 | Hall effect thruster low-frequency oscillation suppression outer loop |
| CN111509720A (en) * | 2020-05-15 | 2020-08-07 | 广东电网有限责任公司清远供电局 | Hybrid passive power filter and three-phase power system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2580654Y (en) * | 2002-09-24 | 2003-10-15 | 杭州华烨电气有限公司 | Passive single-phase filter circuit |
| US20050057949A1 (en) * | 2003-09-17 | 2005-03-17 | Kim Chan Ki | 12th active filter capable of concurrently removing 11th and 13th harmonics |
| CN101237150A (en) * | 2008-02-29 | 2008-08-06 | 中山大学 | Integrated device of efficient light voltage parallel network and mixed active power filter |
| CN203660534U (en) * | 2013-12-27 | 2014-06-18 | 华中科技大学 | Passive power filter |
-
2013
- 2013-12-27 CN CN201310739450.8A patent/CN103746380A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2580654Y (en) * | 2002-09-24 | 2003-10-15 | 杭州华烨电气有限公司 | Passive single-phase filter circuit |
| US20050057949A1 (en) * | 2003-09-17 | 2005-03-17 | Kim Chan Ki | 12th active filter capable of concurrently removing 11th and 13th harmonics |
| CN101237150A (en) * | 2008-02-29 | 2008-08-06 | 中山大学 | Integrated device of efficient light voltage parallel network and mixed active power filter |
| CN203660534U (en) * | 2013-12-27 | 2014-06-18 | 华中科技大学 | Passive power filter |
Non-Patent Citations (1)
| Title |
|---|
| 贾煜等: "串联谐振注入式有源电力滤波器及其工程应用研究", 《电力电子》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111022276A (en) * | 2019-12-27 | 2020-04-17 | 哈尔滨工业大学 | Hall effect thruster low-frequency oscillation suppression outer loop |
| CN111022276B (en) * | 2019-12-27 | 2021-03-12 | 哈尔滨工业大学 | Hall effect thruster low-frequency oscillation suppression outer loop |
| CN111509720A (en) * | 2020-05-15 | 2020-08-07 | 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 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10135329B2 (en) | Virtual impedance comprehensive control method for inductive power filtering system | |
| US9281738B2 (en) | Power conversion apparatus with low common mode noise and application systems thereof | |
| US20150009727A1 (en) | Power converter with low common mode noise | |
| CN103746381A (en) | Hybrid passive power filter | |
| CN104638891B (en) | A kind of common-mode voltage suppression system for photovoltaic combining inverter | |
| CN102055348A (en) | Voltage reducing power electronic transformer for distribution network | |
| CN102386760A (en) | Frequency converter multistage EMI (electromagnetic interference) filter circuit | |
| CN108847775A (en) | Novel electric power electric transformer topological structure | |
| CN104466969B (en) | A kind of LCL type wave filter based on three-winding transformer | |
| CN104811022A (en) | Auxiliary converter and vehicle | |
| CN108183616A (en) | A kind of low stress high frequency DC/DC power inverters based on transformer leakage inductance | |
| CN102169749A (en) | Low-zero-sequence-resistance slow-harmonic energy-saving transformer | |
| CN203660534U (en) | Passive power filter | |
| CN103746380A (en) | Passive power filter | |
| CN105958809A (en) | Filter with coupled inductor and parameter determining method of filter | |
| CN204190628U (en) | A kind of variable-frequency resonance power source being applied to alternating-current voltage resistance test device | |
| CN103856176B (en) | Adopt the LCL filter of coupling inductance | |
| CN102820129A (en) | Filtering type power transformer integrated system and implementation method thereof | |
| CN103337946B (en) | A kind of MW class also/from net converter composite filter | |
| CN203660535U (en) | Hybrid passive power filter | |
| CN104953591A (en) | LLCL type filter based on three-winding transformer | |
| CN111585442A (en) | Multiphase parallel resonant converter capable of automatically equalizing current | |
| US11901733B2 (en) | Hybrid passive power filter and three-phase power system | |
| CN205901578U (en) | Wave filter with coupling inductance | |
| CN210327036U (en) | Alternating current-direct current power supply system with power supply end capable of being grounded |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140423 |