CN102185320B - Active power filter based on boost direct current-direct current (DC-DC) conversion circuit - Google Patents
Active power filter based on boost direct current-direct current (DC-DC) conversion circuit Download PDFInfo
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- CN102185320B CN102185320B CN2011101337714A CN201110133771A CN102185320B CN 102185320 B CN102185320 B CN 102185320B CN 2011101337714 A CN2011101337714 A CN 2011101337714A CN 201110133771 A CN201110133771 A CN 201110133771A CN 102185320 B CN102185320 B CN 102185320B
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 15
- 239000003990 capacitor Substances 0.000 claims abstract description 20
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- 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
- Y02E40/20—Active power filtering [APF]
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Abstract
The invention discloses an active power filter based on a boost direct current-direct current (DC-DC) conversion circuit. The active power filter comprises an A-phase compensation circuit, a B-phase compensation circuit and a C-phase compensation circuit, wherein the A-phase, B-phase and C-phase compensation circuits are connected in a Y shape. The filter uses a direct DC-DC conversion mode and can compensate for the reactive current and harmonic current of a grid by implementing a pulse width modulation on an alternative current switch and injecting even modulation harmonics to duty ratio. The phase compensation circuits of the invention are combined and sealed by using an alternative current load capacitor, a filter inductance connected grid and a power switch tube with an anti-parallel diode and without a large-capacity energy storage device, so that the volume of the device is greatly reduced; the structure is simpler and more compact; the grid side current ripple is small; the parasitic parameter is small; and the maintaining and use cost of the device is greatly reduced; and considerable economic benefit is created.
Description
Technical field
The invention belongs to the technical field of filtering of electric power system, be specifically related to a kind of Active Power Filter-APF based on the direct ac-ac conversion circuit of booster type.
Background technology
The quality of power supply is an important indicator in the electric power system, and the content of harmonic wave then is a key factor that affects the quality of power supply.Along with the development of modern industrial technology, the nonlinear load in the electric power system rolls up, such as rectification load, illumination, arc furnace etc.In recent years a large amount of uses of power electronic equipment, so that the harmonic content in the electrical network increases considerably, the quality of power supply further descends.Harmfulness Caused by Harmonics in the electrical network is very big, and it is so that the residing ecological deterioration of power consumption equipment, and to around communication system and the equipment beyond the utility network bring harm, the various faults and the accident that are caused by harmonic wave also happen occasionally.Active Power Filter-APF produces under this background, and parallel connection type active electric filter is mainly used in harmonic current and the reactive power in the compensation network, and is final so that current power factor height and harmonic content in the electrical network are low.As seen, Active Power Filter-APF plays an important role in now electric power system.
Conventional Active Power Filter-APF adopts inverter structure, a large amount of electrolytic capacitors need to be installed as energy-storage travelling wave tube in its DC side.And the volume of electrolytic capacitor is large, the life-span short, generally the useful life of electrolytic capacitor was less than 1 year, therefore traditional Active Power Filter-APF need to regularly replace electrolytic capacitor, this is so that the maintenance of traditional Active Power Filter-APF, use cost are too high, most enterprises is difficult to accept, to such an extent as to traditional Active Power Filter-APF is difficult to popularization and application.
In view of the deficiency of traditional Active Power Filter-APF, do not need the Active filter of energy-storage travelling wave tube to be suggested, main implementation comprises matrix converter and direct ac-to-ac converter two classes.Yet the quantity of the bidirectional switch pipe that matrix converter needs is more, and control is complicated, so the reliability of converter itself is not high.And the direct ac-to-ac converter of voltage-dropping type (Buck-type) is because its current on line side is interrupted, and harmonic content is larger, optimum structure that neither Active Power Filter-APF.
Summary of the invention
The invention provides a kind of Active Power Filter-APF based on the direct ac-ac conversion circuit of booster type, solved the existing above-mentioned technological deficiency of prior art Active Power Filter-APF, need not jumbo energy storage device, translation circuit is simple in structure, and the current on line side ripple is little.
A kind of Active Power Filter-APF based on the direct ac-ac conversion circuit of booster type comprises that three groups are the phase compensating circuit that three-phase Y type connects.
Described phase compensating circuit comprises an inductance, an AC load electric capacity and four anti-also power switch pipes of diode of band; Wherein, the electrical network bus that one end of inductance is corresponding with described phase compensating circuit links to each other, the another end of inductance links to each other with the anti-also emitter of the power switch pipe of diode of the four-tape with the collector electrode of the anti-also power switch pipe of diode of the first band, the emitter and second of the anti-also power switch pipe of diode of the first band is with the emitter of the power switch pipe of anti-and diode to link to each other, the collector electrode and the 3rd of the anti-also power switch pipe of diode of the second band is with the emitter of the power switch pipe of anti-and diode to link to each other and is consisted of the neutral point of described phase compensating circuit, the anti-also collector electrode of the power switch pipe of diode of the 3rd band links to each other with an end of AC load electric capacity, the another end of AC load electric capacity links to each other with the anti-also collector electrode of the power switch pipe of diode of the four-tape, and the anti-also base stage of the power switch pipe of diode of all bands all receives the driving signal that external equipment provides.
The base stage of the power switch pipe of the anti-and diode of described the first band and the driving signal that the second band is anti-and the base stage of the power switch pipe of diode receives is anti-with described the 3rd band and the base stage of the power switch pipe of diode and the driving signal phase complementation that the four-tape is anti-and the base stage of the power switch pipe of diode receives.
In the preferred technical scheme, described the first band anti-and the power switch pipe of diode and the power switch pipe switching tube module that becomes the semibridge system encapsulation capable of being combined of the anti-also diode of the four-tape, described the second band power switch pipe and the 3rd anti-and diode is with the power switch pipe switching tube module that becomes the semibridge system encapsulation capable of being combined of anti-and diode, and integrated level is high, little, the compact conformation of parasitic parameter.
In the preferred technical scheme, described band power switch pipe anti-and diode is IGBT (insulated gate bipolar transistor).
In the preferred technical scheme, described AC load electric capacity is thin-film capacitor, and volume is little, cost is low, long service life, maintenance cost are low.
Active Power Filter-APF of the present invention, three groups of phase compensating circuit working methods are symmetrical, take arbitrary mutually as example, when the first alternating-current switch that power switch pipe and the second band power switch pipe anti-and diode of and diode anti-by the first band forms open/when turn-offing, the then power switch pipe of and diode anti-by the 3rd band and the second alternating-current switch shutoff that four-tape power switch pipe anti-and diode forms/open-minded; The drive control signal of the first alternating-current switch and the second alternating-current switch adopts pulse width modulation, when in its duty ratio, injecting even modulation harmonic wave, then can obtain corresponding odd harmonic reactive voltage on the AC load electric capacity, thereby produce a certain amount of odd harmonic electric current and reactive current, through behind the inductor filter, inject electrical network; The offset current that injects electrical network is with the harmonic current of load and reactive current amplitude equates and single spin-echo, thereby cancels out each other, finally so that power network current does not contain harmonic current and reactive current, and with the grid voltage waveform same-phase.
Useful technique effect of the present invention is:
(1) the present invention adopts direct ac-ac conversion mode, does not need the dc bus in the traditional electrical die mould inverter technology scheme, does not need jumbo electrochemical capacitor as energy-storage travelling wave tube, thereby so that the volume of device reduces greatly, structure is compacter.
(2) the present invention is by producing harmonic current and the reactive current that odd harmonic electric current and reactive current are come compensating load with a less AC load electric capacity, this AC load electric capacity can use thin-film capacitor to realize, its life-span is longer than electrochemical capacitor, without frequent, thereby so that the maintenance cost of device reduces greatly, reduce user's use cost, have obvious economic benefit.
(3) after the evolution of the present invention by power switch pipe, the combination, can use the module of common semibridge system encapsulation to realize the two-way exchange switch, this is so that the realization of device is easier, and parasitic parameter is little, and is conducive to large-scale production.
(4) the present invention is by adopting filter inductance to be incorporated into the power networks, and for voltage-dropping type ac-ac conversion circuit, grid-connected current is continuous and switching harmonics is little, does not need extra filter circuit, thereby the structure of device is simpler.
Description of drawings
Fig. 1 is the electrical block diagram of Active Power Filter-APF of the present invention.
Fig. 2 is that Active Power Filter-APF of the present invention is applied to the topology example figure in the electric power system.
Fig. 3 is that Active Power Filter-APF of the present invention carries out the current-voltage waveform schematic diagram on the A phase bus of harmonics and reactive compensation to electrical network.
Embodiment
In order more specifically to describe the present invention, below in conjunction with the drawings and the specific embodiments technical scheme of the present invention and relative theory thereof are elaborated.
As shown in Figure 1, a kind of Active Power Filter-APF based on the direct ac-ac conversion circuit of booster type comprises being mutually compensating circuit of A phase compensating circuit, B phase compensating circuit and C that three-phase Y type connects.
A phase compensating circuit comprises mutually IGBT of an A phase inductance, A phase thin-film capacitor and four A; Wherein, A phase inductance L
aAn end link to each other A phase inductance L with electrical network A phase bus
aAnother end and an A phase IGBTQ
A1Collector electrode and the 4th A IGBTQ mutually
A4Emitter link to each other an A phase IGBTQ
A1Emitter and the 2nd A phase IGBTQ
A2Emitter link to each other the 2nd A phase IGBTQ
A2Collector electrode and the 3rd A phase IGBTQ
A3Emitter link to each other and consist of the neutral point of A phase compensating circuit, the 3rd A phase IGBTQ
A3Collector electrode and A phase thin-film capacitor C
aAn end link to each other A phase thin-film capacitor C
aAnother end and the 4th A phase IGBTQ
A4Collector electrode link to each other, the base stage of all A phase IGBT all receives the driving signal that external equipment provides, wherein an A phase IGBTQ
A1Base stage and the 2nd A IGBTQ mutually
A2Base stage the driving signal and the 3rd A phase IGBTQ that receive
A3Base stage and the 4th A IGBTQ mutually
A4The driving signal phase that receives of base stage complementary.
B phase compensating circuit comprises mutually IGBT of a B phase inductance, B phase thin-film capacitor and four B; Wherein, B phase inductance L
bAn end link to each other B phase inductance L with electrical network B phase bus
bAnother end and a B phase IGBTQ
B1Collector electrode and the 4th B IGBTQ mutually
B4Emitter link to each other a B phase IGBTQ
B1Emitter and the 2nd B phase IGBTQ
B2Emitter link to each other the 2nd B phase IGBTQ
B2Collector electrode and the 3rd B phase IGBTQ
B3Emitter link to each other and consist of the neutral point of B phase compensating circuit, the 3rd B phase IGBTQ
B3Collector electrode and B phase thin-film capacitor C
bAn end link to each other B phase thin-film capacitor C
bAnother end and the 4th B phase IGBTQ
B4Collector electrode link to each other, the base stage of all B phase IGBT all receives the driving signal that external equipment provides, wherein a B phase IGBTQ
B1Base stage and the 2nd B IGBTQ mutually
B2Base stage the driving signal and the 3rd B phase IGBTQ that receive
B3Base stage and the 4th B IGBTQ mutually
B4The driving signal phase that receives of base stage complementary.
C phase compensating circuit comprises mutually IGBT of a C phase inductance, C phase thin-film capacitor and four C; Wherein, C phase inductance L
cAn end link to each other C phase inductance L with electrical network C phase bus
cAnother end and a C phase IGBTQ
C1Collector electrode and the 4th C IGBTQ mutually
C4Emitter link to each other a C phase IGBTQ
C1Emitter and the 2nd C phase IGBTQ
C2Emitter link to each other the 2nd C phase IGBTQ
C2Collector electrode and the 3rd C phase IGBTQ
C3Emitter link to each other and consist of the neutral point of C phase compensating circuit, the 3rd C phase IGBTQ
C3Collector electrode and C phase thin-film capacitor C
cAn end link to each other C phase thin-film capacitor C
cAnother end and the 4th C phase IGBTQ
C4Collector electrode link to each other, the base stage of all C phase IGBT all receives the driving signal that external equipment provides, wherein a C phase IGBTQ
C1Base stage and the 2nd C IGBTQ mutually
C2Base stage the driving signal and the 3rd C phase IGBTQ that receive
C3Base stage and the 4th C IGBTQ mutually
C4The driving signal phase that receives of base stage complementary.
The neutral point of all phase compensating circuits links to each other, and consists of the three-phase y-type structure.
IGBT in arbitrary phase compensating circuit and the 4th IGBT switching tube module that becomes the semibridge system encapsulation capable of being combined, the 2nd IGBT and the 3rd IGBT switching tube module that becomes the semibridge system encapsulation capable of being combined.
As shown in Figure 2, there are a large amount of reactive load 3 and nonlinear load 2 in the electrical network, such as motor, lighting circuit, rectification load etc., these load meetings are injected a large amount of reactive current and harmonic current to electrical network, so that the current power factor of electrical network is low and percent harmonic distortion is high.Cross low power factor so that grid power transmission circuit utilance is not high, and line loss increases; And too high percent harmonic distortion can make the element in the utility network produce additional harmonic loss, also can affect simultaneously the normal operation of miscellaneous equipment on the electrical network, and is more serious even can cause particular resonance in the utility network, the normal operation of serious harm electrical network.Therefore country has formulated power factor and total harmonic distortion amount of relevant criteria limit electrical network user load electric current, when the user load electric current does not meet the demands, needs the relevant idle and harmonic compensation device of installing.The Active Power Filter-APF 1 of present embodiment then can compensate reactive current and the harmonic current in the user load circuit, and final so that power network current meets the demands.
The typical waveform of A phase was followed successively by grid voltage waveform, power network current waveform, load current waveform, offset current waveform from top to bottom when waveform shown in Figure 3 was Active Power Filter-APF 1 work among Fig. 2.Can see that grid voltage waveform is smooth sine wave; And because the existence of idle and nonlinear load, the load current waveform power factor is low, and comprises abundant current harmonics.
Offset current is then produced by the Active Power Filter-APF 1 of present embodiment, and in electric power system shown in Figure 2,1, three group of phase compensating circuit of Active Power Filter-APF working method of present embodiment is symmetrical, take A mutually as example, when by an A phase IGBTQ
A1With the 2nd A IGBTQ mutually
A2The first alternating-current switch that forms opens/when turn-offing, then by the 3rd A phase IGBTQ
A3With the 4th A IGBTQ mutually
A4The the second alternating-current switch shutoff that forms/open-minded; The drive control signal of the first alternating-current switch and the second alternating-current switch adopts pulse width modulation, when inject even modulation harmonic wave, then A phase thin-film capacitor C in its duty ratio
aUpper meeting obtains corresponding A phase odd harmonic reactive voltage V
CaThereby, produce a certain amount of A phase odd harmonic electric current and reactive current i
Ca, through A phase inductance L
aAfter the filtering, inject electrical network; Inject the A phase offset current i of electrical network
CmpaWith the harmonic current of load and reactive current amplitude equates and single spin-echo, thereby cancel out each other, final so that A phase power network current i
SaDo not contain harmonic current and reactive current, and with A phase line voltage V
SaThe waveform same-phase, namely power factor is 1, meets the demands, as shown in Figure 3.
Claims (5)
1. Active Power Filter-APF based on the direct ac-ac conversion circuit of booster type is characterized in that: comprise three groups of phase compensating circuits, three groups of phase compensating circuits are three-phase Y type and connect;
Described phase compensating circuit comprises an inductance, an AC load electric capacity and four anti-also power switch pipes of diode of band; Wherein, the electrical network bus that one end of inductance is corresponding with described phase compensating circuit links to each other, the another end of inductance links to each other with the anti-also emitter of the power switch pipe of diode of the four-tape with the collector electrode of the anti-also power switch pipe of diode of the first band, the emitter and second of the anti-also power switch pipe of diode of the first band is with the emitter of the power switch pipe of anti-and diode to link to each other, the collector electrode and the 3rd of the anti-also power switch pipe of diode of the second band is with the emitter of the power switch pipe of anti-and diode to link to each other and is consisted of the neutral point of described phase compensating circuit, the anti-also collector electrode of the power switch pipe of diode of the 3rd band links to each other with an end of AC load electric capacity, the another end of AC load electric capacity links to each other with the anti-also collector electrode of the power switch pipe of diode of the four-tape, and the anti-also base stage of the power switch pipe of diode of all bands all receives the driving signal that external equipment provides.
2. the Active Power Filter-APF based on the direct ac-ac conversion circuit of booster type according to claim 1 is characterized in that: the base stage of the power switch pipe of the anti-and diode of described the first band and the driving signal that the second band is anti-and the base stage of the power switch pipe of diode receives is anti-with described the 3rd band and the base stage of the power switch pipe of diode and the driving signal phase complementation that the four-tape is anti-and the base stage of the power switch pipe of diode receives.
3. the Active Power Filter-APF based on the direct ac-ac conversion circuit of booster type according to claim 1, it is characterized in that: described the first band anti-and the power switch pipe of diode and the switching tube module that four-tape power switch pipe anti-and diode is combined into the semibridge system encapsulation, described the second band anti-and the power switch pipe of diode and the switching tube module that the 3rd band power switch pipe anti-and diode is combined into the semibridge system encapsulation.
4. the Active Power Filter-APF based on the direct ac-ac conversion circuit of booster type according to claim 1 is characterized in that: described band power switch pipe anti-and diode is IGBT.
5. the Active Power Filter-APF based on the direct ac-ac conversion circuit of booster type according to claim 1, it is characterized in that: described AC load electric capacity is thin-film capacitor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101337714A CN102185320B (en) | 2011-05-23 | 2011-05-23 | Active power filter based on boost direct current-direct current (DC-DC) conversion circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101337714A CN102185320B (en) | 2011-05-23 | 2011-05-23 | Active power filter based on boost direct current-direct current (DC-DC) conversion circuit |
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| CN102185320A CN102185320A (en) | 2011-09-14 |
| CN102185320B true CN102185320B (en) | 2013-03-13 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102624014A (en) * | 2012-03-30 | 2012-08-01 | 胡继炜 | System and method for balancing and controlling active power load |
| CN104993679A (en) * | 2015-08-03 | 2015-10-21 | 江苏省电力公司扬州供电公司 | Active filter based on three-level direct AC-AC converter |
| CN105826923B (en) * | 2016-04-22 | 2018-06-22 | 九阳股份有限公司 | A kind of control method for inhibiting silicon-controlled voltage regulation circuit harmonizing wave electric current |
| CN108054762B (en) * | 2017-12-27 | 2021-02-12 | 南京理工大学 | Single-phase reactive compensator based on buck-boost type alternating current chopper |
| CN112290567B (en) * | 2020-12-23 | 2021-03-23 | 西南交通大学 | Three-phase power quality compensation device and method based on half-bridge converter |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101521465A (en) * | 2009-03-26 | 2009-09-02 | 上海大学 | Direct AC-AC power electronic power converter and control method thereof |
| CN101938127A (en) * | 2010-08-17 | 2011-01-05 | 南京航空航天大学 | Single-phase and three-phase dual buck full-bridge parallel active power filter |
| CN201717789U (en) * | 2010-07-09 | 2011-01-19 | 南京工业大学 | Series type electric energy quality compensator based on AC/AC chopper |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101521465A (en) * | 2009-03-26 | 2009-09-02 | 上海大学 | Direct AC-AC power electronic power converter and control method thereof |
| CN201717789U (en) * | 2010-07-09 | 2011-01-19 | 南京工业大学 | Series type electric energy quality compensator based on AC/AC chopper |
| CN101938127A (en) * | 2010-08-17 | 2011-01-05 | 南京航空航天大学 | Single-phase and three-phase dual buck full-bridge parallel active power filter |
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