CN203104325U - High-frequency isolation type inverter for preventing three-phase load imbalance - Google Patents
High-frequency isolation type inverter for preventing three-phase load imbalance Download PDFInfo
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- CN203104325U CN203104325U CN 201320037582 CN201320037582U CN203104325U CN 203104325 U CN203104325 U CN 203104325U CN 201320037582 CN201320037582 CN 201320037582 CN 201320037582 U CN201320037582 U CN 201320037582U CN 203104325 U CN203104325 U CN 203104325U
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Abstract
The utility model specifically discloses a high-frequency isolation type inverter for preventing three-phase load imbalance. 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; inversion voltage is transformed through the high-frequency isolation transformer with double secondary side windings; two voltage output ends subjected to voltage transformation are respectively connected with an input end of the magnetic amplifier rectifying circuit; an 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 utility model 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 inversion system of high frequency chain structure.Converter using high frequency isolating transformer and inversion side realize power transfer, the power supply plan of biquadratic side rectifier series connection has simultaneously satisfied three-phase bridge type converter DC side high voltage requirements, each road rectification can both provide energy for its output capacitance, when yet the inverter threephase load is seriously uneven, neutral line current is bigger, to the power demand difference of two commutation systems of series connection, do not add high capacitance and can't guarantee the midpoint potential balance in the power frequency hemiwave time.
High frequency magnetic amplifying technique is more in stable switch power supply duplex output applications, and has characteristics such as low cost, high efficiency, high reliability.These characteristics also meet the requirement of photovoltaic generating system, therefore, the high frequency chain transformaiton device 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. possess the link of boosting, pursue the application of high efficient and reliable characteristics.
World energy sources is crisis day by day, the energy-saving and cost-reducing attention that more and more is subjected to countries in the world.Clean reproducible energy such as solar energy, wind energy utilizes scale increasing, and little electrical network and intelligent grid demand are also swift and violent unusually.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, need the power inverter of electrical isolation type usually.In actual three-phase electrical power system, the load three-phase is normally unbalanced.How to guarantee the voltage three-phase symmetrical balance under the asymmetric load situation, obtained common attention.Yet the three-phase bridge transformer configuration exists an intrinsic difficult problem: itself can't provide path for zero-sequence component owing to have only two degrees of freedom.Up to the present, Chinese scholars has proposed several different methods at the voltage three-phase equilibrium equilibrium problem under 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.
The utility model content
For solving the shortcoming that prior art exists, the utility model provides a kind of anti-threephase load unbalanced high-frequency isolation type inverter.
The technical solution adopted in the utility model 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 the voltage at two electric capacity two ends respectively, by delivering to high-frequency PWM inverter control system, rectification circuit and three-phase inversion control system behind the signal condition respectively.
Described alternating current filter is a 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 wherein the midpoint potential point that 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, constitutes a brachium pontis after two series connection, three brachium pontis parallel connections then, 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 that two have 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 a three phase full bridge formula inverter.
The beneficial effects of the utility model are:
The utility model cooperates the high-frequency isolation transformer of biquadratic side winding with three phase full bridge formula inverter circuit, can satisfy the demand of 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, though neutral line current can be bigger, the utility model can utilize the magnetic amplifying technique to regulate the output voltage of two-way series rectifier circuit automatically, 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 big, and is light, cost is low.The utility model 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 composite type three-phase bridge type converter, 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 division formula three-phase bridge type converter, need less capacitance, reduced system bulk and prolonged the life-span of system; Compare with the transformer of band mid-point tap, volume weight reduces greatly, is particularly suitable for ships, Aero-Space power-supply system.
This utility model 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/the separate double mode operation the unbalanced electric power system of threephase load field.
Description of drawings
Fig. 1 structure chart of the present utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is elaborated:
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 a three phase full bridge formula inverter.
Described rectification circuit is the rectification circuit based on the magnetic amplifying technique, it comprises that two have 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 a 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, constitutes a brachium pontis after two series connection, three brachium pontis parallel connections then, 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 two capacitor C 1 respectively, the voltage at capacitor C 2 two ends, by delivering to the high-frequency PWM inverter control system behind the signal condition respectively, 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 the 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 high-frequency isolation type 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 the voltage at two electric capacity two ends respectively, by delivering to the high-frequency PWM inverter control system behind the signal condition respectively, 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 high-frequency isolation type inverter of a kind of anti-threephase load as claimed in claim 1, it is characterized in that: described alternating current filter is a 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 wherein the midpoint potential point that two electric capacity is connected in N point and the DC filtering is connected.
4. the unbalanced high-frequency isolation type 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, constitute a brachium pontis after two series connection, three brachium pontis parallel connections then, the mid point of brachium pontis respectively with alternating current filter in one link to each other.
5. the unbalanced high-frequency isolation type 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 that two have 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320037582 CN203104325U (en) | 2013-01-23 | 2013-01-23 | High-frequency isolation type inverter for preventing three-phase load imbalance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320037582 CN203104325U (en) | 2013-01-23 | 2013-01-23 | High-frequency isolation type inverter for preventing three-phase load imbalance |
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| CN203104325U true CN203104325U (en) | 2013-07-31 |
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| CN 201320037582 Expired - Fee Related CN203104325U (en) | 2013-01-23 | 2013-01-23 | High-frequency isolation type inverter for preventing three-phase load imbalance |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103066877A (en) * | 2013-01-23 | 2013-04-24 | 山东大学 | High-frequency isolation type inverter for preventing three-phase load unbalance |
| CN104377977A (en) * | 2014-12-08 | 2015-02-25 | 国家电网公司 | Three-level converter and control method thereof |
-
2013
- 2013-01-23 CN CN 201320037582 patent/CN203104325U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103066877A (en) * | 2013-01-23 | 2013-04-24 | 山东大学 | High-frequency isolation type inverter for preventing three-phase load unbalance |
| CN103066877B (en) * | 2013-01-23 | 2016-01-13 | 山东大学 | The unbalanced high-frequency isolation type inverter of a kind of anti-threephase load |
| CN104377977A (en) * | 2014-12-08 | 2015-02-25 | 国家电网公司 | Three-level converter and control method thereof |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130731 Termination date: 20160123 |
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| EXPY | Termination of patent right or utility model |