CN105932679A - Single-phase grid-connected inverter system based on double harmonic filter - Google Patents
Single-phase grid-connected inverter system based on double harmonic filter Download PDFInfo
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- CN105932679A CN105932679A CN201610416948.4A CN201610416948A CN105932679A CN 105932679 A CN105932679 A CN 105932679A CN 201610416948 A CN201610416948 A CN 201610416948A CN 105932679 A CN105932679 A CN 105932679A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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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- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a single-phase grid-connected inverter system based on a double harmonic filter. The single-phase grid-connected inverter system solves the problems that the active loss is great and the promotion of high-frequency harmonic filter effect is not obvious existing in an existing grid-connected inverter filter system. The single-phase grid-connected inverter system comprises a direct-current power supply (1), a single-phase inverter (2), a double harmonic filter (4) and a single-phase alternating-current power grid (3), wherein the output end of the direct-current power supply (1) is connected with the input end of the single-phase inverter (2); the output end of the single-phase inverter (2) is connected with the single-phase alternating-current power grid (3) through the double harmonic filter (4); an inverter side inductor (Li) of the single-phase double harmonic filter (4) is connected with the output end of the single-phase inverter (2); a grid side inductor (Lg) of the single-phase double harmonic filter (4) is connected with the single-phase alternating-current power grid (3); and a first resonance circuit and a second resonance circuit are connected between the connection point of the inverter side inductor (Li) of the single-phase double harmonic filter (4) and the grid side inductor (Lg) of the single-phase double harmonic filter (4) and the ground in parallel. The harmonic pollution to the power grid when a distributed power supply is connected into the power grid is effectively reduced.
Description
Technical field
The present invention relates to a kind of grid-connected inverting system of use when a kind of solar electrical energy generation carries out grid-connected with existing AC network, can effectively filter the grid-connected inverting system of HF switch harmonic wave produced by single-phase grid-connected inverter particularly to a kind of.
Background technology
When carrying out grid-connected by distributed DC power with existing electrical network, single-phase grid-connected inverter is the primary interface being connected with electrical network as distributed power source, for indispensable parts.DC inverter is become single-phase alternating current by pulsewidth modulation by single-phase grid-connected inverter.Single-phase grid-connected inverter, in completing pulse-width modulation process, can be inevitably generated the HF switch harmonic wave of different frequency, and this part HF switch harmonic wave can enter into existing electrical network along with grid-connected, electrical network is produced serious high-frequency harmonic and pollutes.High-frequency harmonic can cause electric rotating machine and transformator overheated, makes power capacitor bank work abnormal, even causes thermal breakdown to damage, therefore, it is necessary to take effective measures the higher hamonic wave eliminating in electrical network.In order to solve high-frequency harmonic pollution problem, be usually between single-phase inverter and electrical network increase output filter high-frequency harmonic is filtered process, frequently with output filter beLCLWave filter.But harmonic voltage produced by the modulation waveform of single-phase grid-connected inverter is concentrated mainly on the switching frequency of single-phase grid-connected inverterf k Near, and two times of switching frequencies 2f k Near,LCLWave filter is to switching frequencyf k Near and two times of switching frequencies 2f k The damping capacity of neighbouring voltage harmonic is very limited.In order to overcome this shortcoming, someone have employed double resonance wave filter, with in parallel twoRLCSeries resonance branch subsitutionLCLCapacitive branch in wave filter.Damping resistance is added in this capacitive branchRIt is to suppress based on to the resonance spikes of double resonance wave filter, but brings defect that whole inversion system active loss increases and to switching frequencyf k Near, and two times of switching frequencies 2f k The problem that the filter effect of neighbouring harmonic wave promotes suppression., additionally, net side inductance and inverter side inductance and capacitiveLCResonant branch produces series resonance and the resonance spikes of double resonance wave filter can be caused to produce.Generally should in designRLCDuring series resonance branch road, one of them branch roadLCParameter is typically according to filtering what the harmonic wave near switching frequency designed, another branch roadLCParameter designs according to filtering harmonic wave near two times of switching frequencies, owing to not considering the capacitance ratio of two parallel branches in traditional design scheme, there is the uncertain defect in resonance spikes position of double resonance wave filter, within causing resonance spikes to appear in the control bandwidth of double resonance wave filter inversion system, not only easily amplify grid-connected high-frequency harmonic electric current, also result in control system unstable.
Summary of the invention
The invention provides a kind of single-phase grid-connected inversion system based on double resonance wave filter, the active loss solving the existence of existing parallel network reverse filtering system greatly and promotes unconspicuous technical problem to high-frequency harmonic filter effect.
The present invention is to solve above technical problem by the following technical programs:
nullA kind of single-phase grid-connected inversion system based on double resonance wave filter，Including DC source、Single-phase inverter、Single-phase double resonance wave filter 4 and single phase ac electrical network，The outfan of DC source is parallel with electric capacity of voltage regulation,The outfan of DC source links together with the input of single-phase inverter，The outfan of single-phase inverter is linked together with single phase ac electrical network by double resonance wave filter，The inverter side inducer of single-phase double resonance wave filter 4 links together with the outfan of single-phase inverter，The net side inducer of single-phase double resonance wave filter 4 links together with single phase ac electrical network，It is parallel with the first resonant branch being composed in series by switching frequency filter capacitor and switching frequency filter inductor and the second resonant branch being composed in series by two times of switching frequency filter capacitors and two times of switching frequency filter inductors between the inverter side inducer and net side inducer junction point and ground of single-phase double resonance wave filter.
The ratio of the capacitor's capacity of the switching frequency filter capacitor of single-phase double resonance wave filter and the capacitor's capacity of two times of switching frequency filter capacitors is 1:10 to 1:20；
The optimum ratio of the capacitor's capacity of the switching frequency filter capacitor of single-phase double resonance wave filter and the capacitor's capacity of two times of switching frequency filter capacitors is 1:12.
The present invention has been greatly reinforced the HF switch filter effect of double resonance wave filter, and reduces the active loss of single-phase grid-connected inversion system, effectively reduces the harmonic pollution to electrical network when distributed power source is connected to the grid.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of the present invention；
Fig. 2 is the filtering output current wave figure of the present invention.
Detailed description of the invention
The present invention is described in detail below in conjunction with the accompanying drawings:
A kind of single-phase grid-connected inversion system based on double resonance wave filter, including DC source 1, single-phase inverter 2, single-phase double resonance wave filter 4 and AC network 3, is parallel with electric capacity of voltage regulation on the outfan of DC source 1C dc, the outfan of DC source 1 links together with the input of single-phase inverter 2, and the outfan of single-phase inverter 2 is linked together with single phase ac electrical network 3 by single-phase double resonance wave filter 4, the inverter side inducer of single-phase double resonance wave filter 4L iLink together with the outfan of single-phase inverter 2, the net side inducer of single-phase double resonance wave filter 4L gLink together with AC network 3, at the inverter side inducer of single-phase double resonance wave filter 4L iWith net side inducerL gThe first resonant branch being composed in series by switching frequency filter capacitor C1 and the second resonant branch being composed in series by two times of switching frequency filter capacitor C2 and two times of switching frequency filter inductor L2 it is parallel with switching frequency filter inductor L1 between junction point and ground.The present invention is by prior artRLCDamping resistance in series resonance branch roadRRemove, can fully filter switching frequencyf k Near and two times of switching frequencies 2f k Neighbouring voltage harmonic, is greatly enhanced the High frequency filter effect of wave filter, also can reduce the active loss of single-phase grid-connected inversion system, improve the efficiency of single-phase grid-connected inversion system.
The ratio of the capacitor's capacity of the switching frequency filter capacitor C1 of single-phase double resonance wave filter 4 and the capacitor's capacity of two times of switching frequency filter capacitor C2 is 1:10 to 1:20；The ratio of the capacitor's capacity of switching frequency filter capacitor C1 and the capacitor's capacity of two times of switching frequency filter capacitor C2 is that resonant frequency during 1:10 is generally when its ratio is 2 times during 1:1.The resonance spikes frequency of double resonance wave filter can be greatly improved, beyond the control bandwidth of normal controller so that resonance spikes will not produce impact for control system.
The ratio of the capacitor's capacity of the switching frequency filter capacitor C1 of single-phase double resonance wave filter 4 and the capacitor's capacity of two times of switching frequency filter capacitor C2 is 1:12；The resonance spikes control bandwidth beyond normal controller of double resonance wave filter can either be ensured, can guarantee that again the High frequency filter effect of double resonance wave filter.
Claims (3)
1. a single-phase grid-connected inversion system based on double resonance wave filter, including DC source (1), single-phase inverter (2), single-phase double resonance wave filter (4) and single phase ac electrical network (3), the outfan of DC source (1) is parallel with electric capacity of voltage regulation (C dc),
The outfan of DC source (1) links together with the input of single-phase inverter (2), the outfan of single-phase inverter (2) is linked together with single phase ac electrical network (3) by double resonance wave filter (4), it is characterized in that, the inverter side inducer of single-phase double resonance wave filter (4) (L i) link together with the outfan of single-phase inverter (2), the net side inducer of single-phase double resonance wave filter (4) (L g) link together with single phase ac electrical network (3), single-phase double resonance wave filter (4) inverter side inducer (L i) and net side inducer (L g) it is parallel with the first resonant branch being composed in series by switching frequency filter capacitor (C1) and switching frequency filter inductor (L1) and the second resonant branch being composed in series by two times of switching frequency filter capacitors (C2) and two times of switching frequency filter inductors (L2) between junction point and ground.
A kind of single-phase grid-connected inversion system based on double resonance wave filter the most according to claim 1, it is characterized in that, the ratio of the capacitor's capacity of the switching frequency filter capacitor (C1) of single-phase double resonance wave filter (4) and the capacitor's capacity of two times of switching frequency filter capacitors (C2) is 1:10-1:20.
A kind of single-phase grid-connected inversion system based on double resonance wave filter the most according to claim 2, it is characterized in that, the ratio of the capacitor's capacity of the switching frequency filter capacitor (C1) of single-phase double resonance wave filter (4) and the capacitor's capacity of two times of switching frequency filter capacitors (C2) is 1:12.
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| CN201610416948.4A CN105932679B (en) | 2016-06-12 | 2016-06-12 | Single-phase grid-connected inversion system based on double resonance wave filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107919682A (en) * | 2017-11-27 | 2018-04-17 | 天津大学 | A kind of control method suitable for three-phase double resonance wave filter grid-connected inverting system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201328180A (en) * | 2011-12-13 | 2013-07-01 | Thomson Licensing | Active filter with dual response |
| CN103414327A (en) * | 2013-08-14 | 2013-11-27 | 合肥工业大学 | Inverter output filter with a set of series resonance subcircuits |
| CN105226923A (en) * | 2015-09-07 | 2016-01-06 | 北京英博电气股份有限公司 | A kind of high frequency filter being applied to combining inverter |
| CN205863918U (en) * | 2016-06-12 | 2017-01-04 | 中国能源建设集团山西省电力勘测设计院有限公司 | Single-phase grid-connected inversion system based on double resonance wave filter |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201328180A (en) * | 2011-12-13 | 2013-07-01 | Thomson Licensing | Active filter with dual response |
| CN103414327A (en) * | 2013-08-14 | 2013-11-27 | 合肥工业大学 | Inverter output filter with a set of series resonance subcircuits |
| CN105226923A (en) * | 2015-09-07 | 2016-01-06 | 北京英博电气股份有限公司 | A kind of high frequency filter being applied to combining inverter |
| CN205863918U (en) * | 2016-06-12 | 2017-01-04 | 中国能源建设集团山西省电力勘测设计院有限公司 | Single-phase grid-connected inversion system based on double resonance wave filter |
Non-Patent Citations (1)
| Title |
|---|
| 张兴 李飞 王宝基 李浩源: "一种并网逆变器中LCL滤波器改进拓扑的对比研究", 《电源学报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107919682A (en) * | 2017-11-27 | 2018-04-17 | 天津大学 | A kind of control method suitable for three-phase double resonance wave filter grid-connected inverting system |
| CN107919682B (en) * | 2017-11-27 | 2021-01-26 | 天津大学 | Control method suitable for three-phase double-resonant-filter grid-connected inverter system |
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| CN105932679B (en) | 2018-04-20 |
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