CN105932679B - Single-phase grid-connected inversion system based on double resonance wave filter - Google Patents
Single-phase grid-connected inversion system based on double resonance wave filter Download PDFInfo
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- CN105932679B CN105932679B CN201610416948.4A CN201610416948A CN105932679B CN 105932679 B CN105932679 B CN 105932679B CN 201610416948 A CN201610416948 A CN 201610416948A CN 105932679 B CN105932679 B CN 105932679B
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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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- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a kind of single-phase grid-connected inversion system based on double resonance wave filter, solves the problems, such as that active loss existing for existing parallel network reverse filtering system is big and high-frequency harmonic filter effect is lifted unconspicuous.Including DC power supply（1）Output terminal and single-phase inverter（2）Input terminal connection, single-phase inverter（2）Output terminal pass through double resonance wave filter（4）With single phase ac power grid（3）Connection, single-phase double resonance wave filter（4）Inverter side inductor（L i）With single-phase inverter（2）Output terminal connection, single-phase double resonance wave filter（4）Net side inductor（L g）With single phase ac power grid（3）Connection, in single-phase double resonance wave filter（4）Inverter side inductor（L i）With net side inductor（L g）The first resonant branch and the second resonant branch are parallel between tie point and ground.Effectively reduce when distributed generation resource is connected to the grid to the harmonic pollution of power grid.
Description
Technical field
A kind of grid-connected inverting used when carrying out grid-connected the present invention relates to a kind of solar power generation and existing AC network
System, more particularly to a kind of grid-connected inverting system that can effectively filter HF switch harmonic wave caused by single-phase grid-connected inverter.
Background technology
When distributed DC power and existing power grid are carried out grid-connected, single-phase grid-connected inverter is as distributed generation resource
The primary interface being connected with power grid, is indispensable component.Single-phase grid-connected inverter is by pulsewidth modulation that direct current is inverse
Become single-phase alternating current.Single-phase grid-connected inverter can be inevitably generated different frequency in pulse-width modulation process is completed
HF switch harmonic wave, this part HF switch harmonic wave can enter existing power grid with grid-connected, and serious height is produced to power grid
Frequency harmonic pollution.High-frequency harmonic can cause electric rotating machine and transformer to overheat, and make the work of power capacitor group abnormal, or even make
Damaged into thermal breakdown, therefore, it is necessary to take effective measures to eliminate the higher hamonic wave in power grid.In order to solve high-frequency harmonic dirt
Dye problem, increase output filter is filtered processing, Chang Cai to high-frequency harmonic usually between single-phase inverter and power grid
Output filter isLCLWave filter.But since harmonic voltage is main caused by the modulation waveform of single-phase grid-connected inverter
Concentrate 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 switch frequency
Ratef k Neighbouring and two times of switching frequencies 2f k The damping capacity of neighbouring voltage harmonic is very limited.In order to overcome this shortcoming, have
People employs double resonance wave filter, with parallel twoRLCSeries resonance branch subsitutionLCLCapacitive branch in wave filter.
Damping resistance is added in the capacitive branchRIt is to be suppressed based on the resonance spikes to double resonance wave filter, but brings whole
Inversion system active loss increase the defects of and to switching frequencyf k Near, and two times of switching frequencies 2f k The filtering of neighbouring harmonic wave
The problem of effect promoting suppresses., in addition, net side inductance and inverter side inductance and capacitiveLCResonant branch produces series resonance meeting
The resonance spikes of double resonance wave filter are caused to produce.Usually should in designRLCDuring series resonance branch, one of branchLC
Parameter is typically to be designed according to the harmonic wave near switching frequency is filtered out, another branchLCParameter is that basis filters out two times
Switching frequency nearby come what is designed, due to the capacitance ratio without considering two parallel branches in traditional design scheme, deposit by harmonic wave
In the uncertain defect in resonance spikes position of double resonance wave filter, resonance spikes are caused to appear in double resonance wave filter inversion
Within the control bandwidth of system, not only easily amplify grid-connected high-frequency harmonic electric current, it is unstable to also result in control system.
The content of the invention
The present invention provides a kind of single-phase grid-connected inversion system based on double resonance wave filter, solves existing grid-connected inverse
Become active loss existing for filtering system and lift unconspicuous technical problem greatly and to high-frequency harmonic filter effect.
The present invention is to solve above technical problem by the following technical programs：
A kind of single-phase grid-connected inversion system based on double resonance wave filter, including it is DC power supply, single-phase inverter, single-phase double
Resonance filter 4 and single phase ac power grid, are parallel with electric capacity of voltage regulation, the output of DC power supply on the output terminal of DC power supply
The input terminal with single-phase inverter is held to link together, the output terminal of single-phase inverter passes through double resonance wave filter and single phase ac
Power grid links together, and the inverter side inductor of single-phase double resonance wave filter 4 and the output terminal of single-phase inverter are connected to one
Rise, net side inductor and the single phase ac power grid of single-phase double resonance wave filter 4 link together, in single-phase double resonance wave filter
It is parallel between inverter side inductor and net side inductor tie point and ground by switching frequency filter condenser and switching frequency
The first resonant branch and filtered by two times of switching frequency filter condensers and two times of switching frequencies that filter inductor is composed in series
The second resonant branch that inductor is composed in series.
The capacitor's capacity of the switching frequency filter condenser of single-phase double resonance wave filter and two times of switching frequency filter capacitors
The ratio of the capacitor's capacity of device is 1:10 to 1:20；
The capacitor's capacity of the switching frequency filter condenser of single-phase double resonance wave filter and two times of switching frequency filter capacitors
The optimum ratio of the capacitor's capacity of device is 1:12.
The present invention has greatly reinforced the HF switch filter effect of double resonance wave filter, and reduces single-phase grid-connected contravariant system
The active loss of system, effectively reduces when distributed generation resource is connected to the grid to the harmonic pollution of power grid.
Brief description of the drawings
Fig. 1 is the electrical block diagram of the present invention；
Fig. 2 is the filtering output current wave figure of the present invention.
Embodiment
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 it is DC power supply 1, single-phase inverter 2, single-phase
Double resonance wave filter 4 and AC network 3, electric capacity of voltage regulation is parallel with the output terminal of DC power supply 1C dc, DC power supply 1 it is defeated
Outlet and the input terminal of single-phase inverter 2 link together, and the output terminal of single-phase inverter 2 passes through single-phase double resonance wave filter 4
Link together with single phase ac power grid 3, the inverter side inductor of single-phase double resonance wave filter 4L iWith single-phase inverter 2
Output terminal links together, the net side inductor of single-phase double resonance wave filter 4L gLink together with AC network 3, single-phase
The inverter side inductor of double resonance wave filter 4L iWith net side inductorL gIt is parallel between tie point and ground and is filtered by switching frequency
The first resonant branch that ripple capacitor C1 and switching frequency filter inductor L1 are composed in series and by two times of switching frequency filtered electricals
The second resonant branch that container C2 and two times of switching frequency filter inductor L2 are composed in series.The present invention is by the prior artRLC
Damping resistance in series resonance branchRRemove, can fully filter out switching frequencyf k Neighbouring and two times of switching frequencies 2f k Near
Voltage harmonic, greatly enhance the High frequency filter effect of wave filter, can also reduce the active loss of single-phase grid-connected inversion system, carry
The efficiency of high single-phase grid-connected inversion system.
The capacitor's capacity and two times of switching frequency filtered electricals of the switching frequency filter condenser C1 of single-phase double resonance wave filter 4
The ratio of the capacitor's capacity of container C2 is 1:10 to 1:20；The capacitor's capacity of switching frequency filter condenser C1 and two times of switch frequencies
The ratio of the capacitor's capacity of rate filter condenser C2 is 1:Resonant frequency when 10 is generally when its ratio is 1:2 times when 1.Energy
It is enough to greatly improve the resonance spikes frequency of double resonance wave filter, beyond the control bandwidth of normal controller so that resonance spikes
It will not be had an impact for control system.
The capacitor's capacity and two times of switching frequency filtered electricals of the switching frequency filter condenser C1 of single-phase double resonance wave filter 4
The ratio of the capacitor's capacity of container C2 is 1:12；The resonance spikes of double resonance wave filter can either be ensured beyond normal controller
Control bandwidth, and can guarantee that the High frequency filter effect of double resonance wave filter.
Claims (2)
1. a kind of single-phase grid-connected inversion system based on double resonance wave filter, including DC power supply（1）, single-phase inverter（2）, it is single
Phase double resonance wave filter（4）With single phase ac power grid（3）, in DC power supply（1）Output terminal on be parallel with electric capacity of voltage regulation（Cdc）,
DC power supply（1）Output terminal and single-phase inverter（2）Input terminal link together, single-phase inverter（2）Output terminal lead to
Cross double resonance wave filter（4）With single phase ac power grid（3）Link together, it is characterised in that single-phase double resonance wave filter（4）'s
Inverter side inductor（Li）With single-phase inverter（2）Output terminal link together, single-phase double resonance wave filter（4）Net side
Inductor（Lg）With single phase ac power grid（3）Link together, in single-phase double resonance wave filter（4）Inverter side inductor
（Li）With net side inductor（Lg）It is parallel between tie point and ground by switching frequency filter condenser（C1）Filtered with switching frequency
Inductor（L1）The first resonant branch for being composed in series and by two times of switching frequency filter condensers（C2）With two times of switching frequencies
Filter inductor（L2）The second resonant branch being composed in series；Single-phase double resonance wave filter（4）Switching frequency filter condenser
（C1）Capacitor's capacity and two times of switching frequency filter condensers（C2）Capacitor's capacity ratio be 1:10-1:20.
2. a kind of single-phase grid-connected inversion system based on double resonance wave filter according to claim 1, it is characterised in that single
Phase double resonance wave filter（4）Switching frequency filter condenser（C1）Capacitor's capacity and two times of switching frequency filter condensers
（C2）Capacitor's capacity ratio be 1:12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| Application Number | Priority Date | Filing Date | Title |
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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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| Publication Number | Publication Date |
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| CN105932679A CN105932679A (en) | 2016-09-07 |
| CN105932679B true CN105932679B (en) | 2018-04-20 |
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| 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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| EP2792072A1 (en) * | 2011-12-13 | 2014-10-22 | 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 |
| CN105226923B (en) * | 2015-09-07 | 2018-05-08 | 北京英博电气股份有限公司 | A kind of high frequency filter applied to gird-connected 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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