CN103066877A - High-frequency isolation type inverter for preventing three-phase load unbalance - Google Patents
High-frequency isolation type inverter for preventing three-phase load unbalance Download PDFInfo
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- CN103066877A CN103066877A CN2013100261774A CN201310026177A CN103066877A CN 103066877 A CN103066877 A CN 103066877A CN 2013100261774 A CN2013100261774 A CN 2013100261774A CN 201310026177 A CN201310026177 A CN 201310026177A CN 103066877 A CN103066877 A CN 103066877A
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Abstract
The invention discloses a high-frequency isolation type inverter for preventing three-phase load unbalance. The high-frequency isolation type inverter comprises a direct current input circuit, a high-frequency inverter, a high-frequency isolation transformer with double secondary side windings, a magnetic amplifier rectifying circuit, a direct current filter, a three-phase bridge type inverter and an alternating current filter, wherein the direct current input circuit is connected with the high-frequency inverter; the inversion voltage is transformed through the high-frequency isolation transformer with double secondary side windings; the two voltage output ends subjected to voltage transformation are respectively connected with the input end of the magnetic amplifier rectifying circuit; the output end of each magnetic amplifier rectifying circuit is connected with the direct current filter; the direct current filter is connected with the three-phase bridge type inverter; the three-phase bridge type inverter is connected with the alternating current filter; capacitors of two direct current filters are connected with each other; and the joint of the two capacitors is connected with a point N of the alternating current filter.
Description
Technical field
The present invention relates to the unbalanced high-frequency isolation type inverter of a kind of anti-threephase load.
Background technology
The DC-DC converter is widely used in as main devices having realized maximal power tracing and boosting inverter in the photovoltaic inverting system of High Frequency Link structure.Converter using high frequency isolating transformer and inversion side realize Energy Transfer, the power supply plan of simultaneously biquadratic side rectifier series connection has satisfied three-phase bridge type converter DC side high voltage requirements, each road rectification can both provide energy for its output capacitance, yet during the serious imbalance of inverter threephase load, neutral line current is larger, power demand to two commutation systems of series connection in the power frequency hemiwave time is different, does not add high capacitance and can't guarantee the midpoint potential balance.
High frequency magnetic amplifying technique is more in stable switch power supply duplex output applications, and has the characteristics such as low cost, high efficiency, high reliability.These characteristics also meet the requirement of photovoltaic generating system, therefore, the High Frequency Link converter of this application magnetic amplifying technique is specially adapted to generation of electricity by new energy, electric power storage energy-accumulating power station, and super capacitor system and electric automobile etc. possesses the link of boosting, pursues the application of high efficient and reliable characteristics.
World energy sources is crisis increasingly, the energy-saving and cost-reducing attention that more and more is subject to countries in the world.The clean reproducible energy such as solar energy, wind energy utilizes scale increasing, and little electrical network and intelligent grid demand are also unusually swift and violent.For satisfy the little electrical network of new forms of energy can be incorporated into the power networks and two kinds of occasions of isolated island under safe operation, usually need the power inverter of electric isolation type.In actual three-phase electrical power system, the load three-phase is normally unbalanced.How to guarantee the voltage three-phase symmetrical balance in the asymmetric load situation, obtained general concern.Yet the three-phase bridge inverter structure exists an intrinsic difficult problem: itself can't provide path for zero-sequence component owing to only having two degrees of freedom.Up to the present, Chinese scholars has proposed several different methods for the voltage three-phase equilibrium equilibrium problem in the unbalanced load situation: split capacitor method, band mid-point tap Industrial Frequency Transformer method, single-phase inverter combined method, three-phase four-leg inverter.
Summary of the invention
The shortcoming that exists for solving prior art the invention provides the unbalanced high-frequency isolation type inverter of a kind of anti-threephase load.
The technical solution used in the present invention is as follows:
The unbalanced novel inverter of a kind of anti-threephase load comprises high-frequency isolation transformer, rectification circuit, DC filter, three-phase bridge type converter and the alternating current filter of direct-flow input circuit, high-frequency inverter, biquadratic side winding.Described direct-flow input circuit links to each other with high-frequency inverter, inverter voltage is by the high-frequency isolation transformer transformation of biquadratic side winding, two voltage output ends after the transformation link to each other with the input of rectification circuit respectively, the output of each rectification circuit links to each other with DC filter, described DC filter links to each other with three-phase bridge type converter, described three-phase bridge type converter links to each other with alternating current filter, the electric capacity of described two DC filter links to each other, and the midpoint potential point of two electric capacity links to each other with the electric capacity output of alternating current filter.
Described three-phase bridge type converter is controlled by the three-phase inversion control system, described high-frequency inverter is controlled by the high-frequency PWM inverter control system, two electric capacity of described DC filter detect with capacitance voltage and link to each other with signal conditioning circuit, described capacitance voltage detection and signal conditioning circuit detect respectively the voltage at two electric capacity two ends, by delivering to respectively high-frequency PWM inverter control system, rectification circuit and three-phase inversion control system behind the signal condition.
Described alternating current filter is three-phase alternating current LCL filter, its input links to each other with the three-phase bridge type converter output, output terminals A, B, C, N and three phase network or three-phase alternating current load are joined, and the midpoint potential point that wherein two electric capacity is connected in N point and the DC filtering is connected.
Described three-phase bridge type converter comprises 6 device for power switching, consists of a brachium pontis after two series connection, then three brachium pontis parallel connections, the mid point of brachium pontis respectively with alternating current filter in one link to each other.
Described rectification circuit is the rectification circuit based on the magnetic amplifying technique, it comprises two with non-linear saturable reactor, and described rectification circuit importation links to each other with the secondary winding output of the high-frequency isolation transformer of biquadratic side winding, and its output links to each other with DC filter.
Three-phase bridge type converter is the Three-phase full-bridge inverter.
The invention has the beneficial effects as follows:
The present invention cooperates the high-frequency isolation transformer of biquadratic side winding with the Three-phase full-bridge inverter circuit, can satisfy the demand of the isolated grid-connected generating of photovoltaic and independently-powered two aspects of three-phase and four-line.Especially when the serious imbalance of threephase load, although neutral line current can be larger, the present invention can utilize the magnetic amplifying technique automatically to regulate the output voltage of two-way series rectifier circuit, and is stable with the current potential that guarantees dc filter capacitor mid point O.Thereby guarantee output three-phase voltage symmetrical balance.
Novel inverter adopts the high-frequency isolation transformer of biquadratic side winding to compare with power frequency isolating transformer scheme, and power density is large, and is light, cost is low.The present invention utilizes magnetic amplifying technique stable DC filter capacitor midpoint potential in addition, and the midpoint potential point of two electric capacity linked to each other with the zero line N of three-phase and four-line, this scheme is compared with the Combined three phase bridge-type inverter, and used high-power switch device lacks half, so cost is lower.It is compared with the three-phase four-arm topological structure and saves 2 powerful switching devices, has reduced cost; Compare with electric capacity Split type three-phase bridge type converter, need less capacitance, reduced system bulk and prolonged system lifetim; Compare with the transformer with mid-point tap, volume weight reduces greatly, is particularly suitable for ships, Aero-Space power-supply system.
This invention is specially adapted to the little electrical network of new forms of energy, electric power storage energy-accumulating power station, electric automobile, novel ships system etc. needs electrical isolation, is incorporated into the power networks/independent dual mode operated the unbalanced electric power system of threephase load field.
Description of drawings
Fig. 1 structure chart of the present invention.
Embodiment
The present invention is described in detail below in conjunction with accompanying drawing:
As shown in Figure 1, the unbalanced high-frequency isolation type inverter of a kind of anti-threephase load, comprise direct-flow input circuit, high-frequency inverter, the high-frequency isolation transformer of biquadratic side winding, rectification circuit, DC filter, three-phase bridge type converter and alternating current filter, described direct-flow input circuit links to each other with high-frequency inverter, inverter voltage is by the high-frequency isolation transformer transformation of biquadratic side winding, two voltage output ends after the transformation link to each other with the input of rectification circuit respectively, the output of each rectification circuit links to each other with DC filter, described DC filter links to each other with three-phase bridge type converter, described three-phase bridge type converter links to each other with alternating current filter, the electric capacity of described two DC filter links to each other, and the midpoint potential point of two electric capacity links to each other with the electric capacity output of alternating current filter.
High-frequency inverter comprises full-bridge, half-bridge, positive activation type or inverse-excitation type inverter circuit.Three-phase bridge type converter is the Three-phase full-bridge inverter.
Described rectification circuit is the rectification circuit based on the magnetic amplifying technique, it comprises two with non-linear saturable reactor, and described rectification circuit importation links to each other with the secondary winding output of the high-frequency isolation transformer of biquadratic side winding, and its output links to each other with DC filter.
Described DC filter has two, it is direct current LC filter, comprise inductance L 1, capacitor C 1 and inductance L 2, capacitor C 2, wherein capacitor C 1 is designated as the O point with the point of contact of capacitor C 2, and described three-phase bridge type converter comprises 6 device for power switching, consists of a brachium pontis after two series connection, then three brachium pontis parallel connections, the mid point of brachium pontis is respectively Va, Vb, Vc.Described alternating current filter is made of 6 reactors and 3 polarity free capacitors, and its input links to each other with three-phase bridge type converter output, and output terminals A, B, C, N and three phase network or three-phase alternating current load are joined, and wherein the N point is connected with DC filtering mid point O.
Three-phase bridge type converter is controlled by the three-phase inversion control system, described high-frequency inverter is controlled by the high-frequency PWM inverter control system, the capacitor C 1 of DC filter, capacitor C 2 detects with capacitance voltage respectively and links to each other with signal conditioning circuit, capacitance voltage detects and signal conditioning circuit detects respectively two capacitor C 1, the voltage at capacitor C 2 two ends, by delivering to respectively the high-frequency PWM inverter control system behind the signal condition, rectification circuit and three-phase inversion control system, rectification circuit is regulated the midpoint potential of DC filter capacitor C 1 and capacitor C 2 according to the voltage signal that receives, the high-frequency PWM inverter control system is according to the voltage control high-frequency inverter that receives, and the three-phase inversion control system is according to voltage and the DC filter output terminals A of voltage detecting and signal conditioning circuit output, B, the ac output voltage e of C
ABC, ac output current i
ABC, the work of control three-phase bridge type converter power switch pipe, thereby output three-phase alternating current.
Claims (5)
1. unbalanced high-frequency isolation type inverter of anti-threephase load, comprise direct-flow input circuit, high-frequency inverter, the high-frequency isolation transformer of biquadratic side winding, rectification circuit, DC filter, three-phase bridge type converter and alternating current filter, described direct-flow input circuit links to each other with high-frequency inverter, inverter voltage is by the high-frequency isolation transformer transformation of biquadratic side winding, two voltage output ends after the transformation link to each other with the input of rectification circuit respectively, the output of each rectification circuit links to each other with DC filter, described DC filter links to each other with three-phase bridge type converter, described three-phase bridge type converter links to each other with alternating current filter, it is characterized in that: the electric capacity of described two DC filter links to each other, and the midpoint potential point of two electric capacity links to each other with the electric capacity output of alternating current filter.
2. the unbalanced novel high-frequency inverter of a kind of anti-threephase load as claimed in claim 1, it is characterized in that: described three-phase bridge type converter is controlled by the three-phase inversion control system, described high-frequency inverter is controlled by the high-frequency PWM inverter control system, two electric capacity of described DC filter detect with capacitance voltage and link to each other with signal conditioning circuit, described capacitance voltage detection and signal conditioning circuit detect respectively the voltage at two electric capacity two ends, by delivering to respectively the high-frequency PWM inverter control system behind the signal condition, rectification circuit and three-phase inversion control system, rectification circuit is regulated the midpoint potential of two electric capacity of DC filter according to the voltage signal that receives, the high-frequency PWM inverter control system is according to the voltage control high-frequency inverter that receives, the three-phase inversion control system is according to voltage detecting and the voltage of signal conditioning circuit output and the ac output voltage of DC filter output, ac output current, the work of control three-phase bridge type converter power switch pipe, thereby output three-phase alternating current.
3. the unbalanced novel high-frequency inverter of a kind of anti-threephase load as claimed in claim 1, it is characterized in that: described alternating current filter is three-phase alternating current LCL filter, its input links to each other with the three-phase bridge type converter output, output terminals A, B, C, N and three phase network or three-phase alternating current load are joined, and the midpoint potential point that wherein two electric capacity is connected in N point and the DC filtering is connected.
4. the unbalanced novel high-frequency inverter of a kind of anti-threephase load as claimed in claim 1, it is characterized in that: described three-phase bridge type converter comprises 6 device for power switching, consist of a brachium pontis after two series connection, then three brachium pontis parallel connections, the mid point of brachium pontis respectively with alternating current filter in one link to each other.
5. the unbalanced novel high-frequency inverter of a kind of anti-threephase load as claimed in claim 1, it is characterized in that: described rectification circuit is the rectification circuit based on the magnetic amplifying technique, it comprises two with non-linear saturable reactor, and described rectification circuit importation links to each other with the secondary winding output of the high-frequency isolation transformer of biquadratic side winding, and its output links to each other with DC filter.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103715717A (en) * | 2013-12-31 | 2014-04-09 | 华北电力大学（保定） | Method for controlling three-phase photovoltaic grid-connected inverter when power grid voltage is unbalanced |
| CN104539173A (en) * | 2015-01-23 | 2015-04-22 | 深圳市禾望电气股份有限公司 | Transformer circuit |
| CN105981277A (en) * | 2014-02-19 | 2016-09-28 | 三菱电机株式会社 | Dc power supply device, electric motor drive device equipped with said dc power supply device, and refrigerating cycle device equipped with said electric motor drive device |
| CN107332250A (en) * | 2017-08-29 | 2017-11-07 | 杭州电子科技大学 | A kind of multi-mode voltage based on three-phase inverter temporarily rises temporarily drop power supply |
| CN107592689A (en) * | 2016-07-06 | 2018-01-16 | 中国海洋石油总公司 | A kind of intelligent heating dual frequency power supplies heater |
| CN108732441A (en) * | 2018-05-07 | 2018-11-02 | 天津瑞能电气有限公司 | A kind of aging testing system based on current transformer product |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103715717A (en) * | 2013-12-31 | 2014-04-09 | 华北电力大学（保定） | Method for controlling three-phase photovoltaic grid-connected inverter when power grid voltage is unbalanced |
| CN103715717B (en) * | 2013-12-31 | 2015-12-30 | 华北电力大学（保定） | The control method of three-phase photovoltaic grid-connected inverting device when unbalanced source voltage |
| CN105981277A (en) * | 2014-02-19 | 2016-09-28 | 三菱电机株式会社 | Dc power supply device, electric motor drive device equipped with said dc power supply device, and refrigerating cycle device equipped with said electric motor drive device |
| US9929636B2 (en) | 2014-02-19 | 2018-03-27 | Mitsubishi Electric Corporation | DC power-supply device, motor drive device including the same, and refrigeration-cycle application device including the motor drive device |
| CN105981277B (en) * | 2014-02-19 | 2019-04-23 | 三菱电机株式会社 | Continuous-current plant, motor drive and refrigeration cycle application apparatus |
| CN104539173A (en) * | 2015-01-23 | 2015-04-22 | 深圳市禾望电气股份有限公司 | Transformer circuit |
| CN107592689A (en) * | 2016-07-06 | 2018-01-16 | 中国海洋石油总公司 | A kind of intelligent heating dual frequency power supplies heater |
| CN107332250A (en) * | 2017-08-29 | 2017-11-07 | 杭州电子科技大学 | A kind of multi-mode voltage based on three-phase inverter temporarily rises temporarily drop power supply |
| CN107332250B (en) * | 2017-08-29 | 2024-02-02 | 杭州电子科技大学 | Multi-mode voltage sag power supply based on three-phase inverter |
| CN108732441A (en) * | 2018-05-07 | 2018-11-02 | 天津瑞能电气有限公司 | A kind of aging testing system based on current transformer product |
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Application publication date: 20130424 Assignee: AOTAI ELECTRIC Co.,Ltd. Assignor: SHANDONG University Contract record no.: X2021980009598 Denomination of invention: A high frequency isolated inverter against three-phase load imbalance Granted publication date: 20160113 License type: Exclusive License Record date: 20210922 |
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