CN103269178A - Single-stage type isolated type three-phase two-way AC/DC converter and control method thereof - Google Patents
Single-stage type isolated type three-phase two-way AC/DC converter and control method thereof Download PDFInfo
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Abstract
The invention discloses a single-stage type isolated type three-phase two-way AC/DC converter and a control method of the single-stage type isolated type three-phase two-way AC/DC converter. Midpoints of three bridge arms of a three-phase bridge arm in the converter are respectively connected with alternating side inductors and two-way switches. The other ends of the three two-way switches are all connected with a dotted terminal of a primary winding of an isolation transformer, a half-bridge bridge arm is connected with the three-phase bridge arm in parallel, the midpoint of the half-bridge bridge arm is connected with a synonym terminal of the primary winding of the isolation transformer, a sub winding of the isolation transformer is connected with two midpoints of a rectifier or inverter bridge arm, and the rectifier or inverter bridge arm is connected with a direct current side filtering capacitor in parallel. An SVPWM method is used for controlling the converter, and time of primary side current in the isolation transformer in each switching period is equal to the sum of times of positive current and negative current. Buck-boost output can be achieved only by adopting a single stage type structure, and meanwhile high-frequency electric isolation between input and output is achieved, and the single-stage type isolated type three-phase two-way AC/DC converter has the functions of grid-side current being sine waves, grid-side power factor control, two-way efficient transmission of electric energy, rapid dynamic response and buck-boost output.
Description
Technical field
The present invention relates to the AC/DC converter, relate in particular to the two-way AC/DC converter of a kind of single stage type isolated form three-phase and control method thereof.
Background technology
Distributed power generation can provide the unrivaled reliability of conventional electric power system and economy, and its characteristic flexible, that disperse can make it standby each other with big electrical network, and power supply reliability is improved.But, distributed power source unit cost of access height, control difficulty.In order to reduce distributed power source to the impact of electrical network, when electric power system was broken down, distributed power source must be at once out of service, and this has limited giving full play to of distributed power source greatly, has also limited the utilization to new forms of energy indirectly.In order to overcome the above problems, the microgrid technology is arisen at the historic moment, and it has coordinated the contradiction between distributed power generation and the big electrical network, makes new and renewable sources of energy enter the New Times that scale is used.Microgrid and big electrical network be standby, cooperation each other, is conducive to the development and use of new forms of energy, alleviates the power supply pressure of peak of power consumption period, has improved power supply reliability and economy, is the main direction of Future New Energy Source utilization development.
The microgrid system configuration of research mainly contains and exchanges microgrid, direct current microgrid and alternating current-direct current mixing microgrid both at home and abroad at present.In exchanging microgrid, need a two-way AC/DC converter between ac bus and the storage battery, help storage battery to realize the effect of peak load shifting; In the direct current microgrid, two-way AC/DC converter is realized the mutual transmission of energy between electrical network and the dc bus as the electrical network interface converter; In alternating current-direct current mixing microgrid, two-way AC/DC converter is the pivotal player of bearing the system capacity management function, is that interchange microgrid and direct current microgrid carry out unique passage that energy transmits.In large-power occasions, consider to adopt the two-way AC/DC converter of three-phase usually, it is the key transformation device that guarantees the normal operation of microgrid.
The two-way AC/DC converter of three-phase adopts the Three-phase PWM Voltage Rectifier topology usually.Adopt the DC side of the two-way AC/DC converter of three-phase of Three-phase PWM Voltage Rectifier topology to be the characteristic of boosting, three-phase 380V alternating voltage direct voltage after its conversion reaches 600～800V usually, need after the back level adds the DC/DC converter to carry out step-down, just can receive on the 380V dc bus, make the two-way AC/DC converter of this three-phase need two-layer configuration, simultaneously can not realize electrical isolation because of it, need to use Industrial Frequency Transformer, cause it to have the shortcoming that volume weight is big, cost is high.
Summary of the invention
The purpose of this invention is to provide the two-way AC/DC converter of a kind of single stage type isolated form three-phase and control method thereof, solving the two-way AC/DC converter of three-phase in the prior art is the problem that 380V direct voltage or 380V dc voltage conversion must adopt two-layer configuration when being three-phase 380V alternating voltage with three-phase 380V AC voltage conversion, realizes electrical isolation simultaneously.
The technical scheme that the present invention takes for achieving the above object is: the two-way AC/DC converter of a kind of single stage type isolated form three-phase, comprise that three exchange the side inductance, the three-phase brachium pontis, three bidirectional switchs, the half-bridge brachium pontis, isolating transformer, rectification/inverter bridge leg and DC side filter capacitor, three brachium pontis mid points of three-phase brachium pontis exchange the side inductance respectively and link to each other with a bidirectional switch with one, the other end of three bidirectional switchs all links to each other with the former limit of isolating transformer winding end of the same name, the half-bridge brachium pontis is in parallel with the three-phase brachium pontis, the brachium pontis mid point of half-bridge brachium pontis links to each other with the former limit of isolating transformer winding different name end, isolating transformer secondary winding links to each other with two mid points of rectification/inverter bridge leg, and rectification/inverter bridge leg is in parallel with the DC side filter capacitor.
Described three-phase brachium pontis is made up of six switching tubes, the emitter of first switching tube links to each other as a brachium pontis with the collector electrode of second switch pipe, the emitter of the 3rd switching tube links to each other as a brachium pontis with the collector electrode of the 4th switching tube, the emitter of the 5th switching tube links to each other as a brachium pontis with the collector electrode of the 6th switching tube, the collector electrode of first switching tube, the 3rd switching tube, the 5th switching tube links to each other, and the emitter of second switch pipe, the 4th switching tube, the 6th switching tube links to each other.
Described three bidirectional switchs are made up of six switching tubes, the emitter of the emitter of the 7th switching tube and the 8th switching tube is connected to form a bidirectional switch, the emitter of the emitter of the 9th switching tube and the tenth switching tube is connected to form a bidirectional switch, and the emitter that the emitter of the 11 switching tube and twelvemo are closed pipe is connected to form a bidirectional switch.
Described half-bridge brachium pontis is made up of two switching tubes, and the emitter of the 13 switching tube links to each other with the collector electrode of the 14 switching tube.
Described rectification/inverter bridge leg is made up of four switching tubes, the emitter of the 15 switching tube links to each other as a brachium pontis with the collector electrode that sixteenmo closes pipe, the emitter of the 17 switching tube links to each other as a brachium pontis with the collector electrode that eighteenmo closes pipe, the collector electrode of the 15 switching tube, the 17 switching tube links to each other, and the emitter that sixteenmo closes pipe, eighteenmo pass pipe links to each other.
Described switching tube composes in parallel by a single-way switch pipe and a diode, and the emitter of single-way switch pipe links to each other with the anode of diode when in parallel, and the collector electrode of single-way switch pipe links to each other with the negative electrode of diode.
Described diode can be the anti-and diode of IGBT, also can be the parasitic diode of MOSFET.
Isolating transformer in the two-way AC/DC converter of single stage type isolated form three-phase of the present invention has buck and electrical isolation dual-use function, and rectification/inverter bridge leg has rectification function under the rectification pattern, have invert function under inverter mode.When the two-way AC/DC converter of single stage type isolated form three-phase works in the rectification pattern, the three-phase 380V alternating voltage of input is transformed to single phase alternating current (A.C.) voltage by three-phase brachium pontis, half-bridge brachium pontis and bidirectional switch, is the 380V direct voltage by the step-down of isolating transformer, the rectifying conversion of rectification/inverter bridge leg then; When the two-way AC/DC converter of single stage type isolated form three-phase works in inverter mode, the 380V direct voltage of input is single phase alternating current (A.C.) voltage by the inversion of rectification/inverter bridge leg, the boosting inverter of isolating transformer, is transformed to three-phase 380V alternating voltage by three-phase brachium pontis, half-bridge brachium pontis and bidirectional switch again.To the invention solves the two-way AC/DC converter of three-phase in the prior art be the problem that 380V direct voltage or 380V dc voltage conversion must adopt two-layer configuration when being three-phase 380V alternating voltage with three-phase 380V AC voltage conversion, the high frequency electrical isolation between having realized input simultaneously and having exported.In addition, the present invention also have current on line side for sine wave, net side power factor controlling, the two-way high efficiency of transmission of electric energy, dynamic response soon and function such as buck output.
Description of drawings
Fig. 1 is the two-way AC/DC converter circuit of single stage type isolated form three-phase of the present invention structural representation.
Fig. 2 is the two-way AC/DC converter of single stage type isolated form three-phase of the present invention SVPWM control block diagram.
Fig. 3 is single stage type isolated form three-phase two-way AC/DC converter fundamental voltage space vector of the present invention and sector division figure.
Fig. 4 is the two-way AC/DC converter of single stage type isolated form three-phase of the present invention sector 1 voltage vector-diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is the circuit basic structure schematic diagram of the two-way AC/DC converter of single stage type isolated form three-phase, is made up of three interchange side inductance 1, three-phase brachium pontis 2, three bidirectional switchs 3, half-bridge brachium pontis 4, isolating transformer 5, rectification/inverter bridge leg 6 and DC side filter capacitors 7.Among Fig. 1
Q A1 ,
Q A4 ,
Q B1 ,
Q B4 ,
Q C1 ,
Q C4 ,
Q A2 ,
Q A3 ,
Q B2 ,
Q B3 ,
Q C2 ,
Q C3 ,
Q P1 ,
Q P2 ,
Q S1 ,
Q S2 ,
Q S3 ,
Q S4 Be switching tube,
Q A1 By a single-way switch pipe and diode
D A1 Be formed in parallel,
Q A4 By a single-way switch pipe and diode
D A4 Be formed in parallel,
Q B1 By a single-way switch pipe and diode
D B1 Be formed in parallel,
Q B4 By a single-way switch pipe and diode
D B4 Be formed in parallel,
Q C1 By a single-way switch pipe and diode
D C1 Be formed in parallel,
Q C4 By a single-way switch pipe and diode
D C4 Be formed in parallel,
Q A2 By a single-way switch pipe and diode
D A2 Be formed in parallel,
Q A3 By a single-way switch pipe and diode
D A3 Be formed in parallel,
Q B2 By a single-way switch pipe and diode
D B2 Be formed in parallel,
Q B3 By a single-way switch pipe and diode
D B3 Be formed in parallel,
Q C2 By a single-way switch pipe and diode
D C2 Be formed in parallel,
Q C3 By a single-way switch pipe and diode
D C3 Be formed in parallel,
Q P1 By a single-way switch pipe and diode
D P1 Be formed in parallel,
Q P2 By a single-way switch pipe and diode
D P2 Be formed in parallel,
Q S1 By a single-way switch pipe and diode
D S1 Be formed in parallel,
Q S2 By a single-way switch pipe and diode
D S2 Be formed in parallel,
Q S3 By a single-way switch pipe and diode
D S3 Be formed in parallel,
Q S4 By a single-way switch pipe and diode
D S4 Be formed in parallel, the emitter of single-way switch pipe links to each other with the anode of diode when in parallel, and collector electrode links to each other with the negative electrode of diode.
D A1 ,
D A4 ,
D B1 ,
D B4 ,
D C1 ,
D C4 ,
D A2 ,
D A3 ,
D B2 ,
D B3 ,
D C2 ,
D C3 ,
D P1 ,
D P2 ,
D S1 ,
D S2 ,
D S3 ,
D S4 Can be the anti-and diode of IGBT, also can be the parasitic diode of MOSFET.When switching frequency is low, adopt common rectifier diode; When switching frequency is higher, adopt fast recovery diode or Schottky diode.
Consisting of of three-phase brachium pontis 2: first switching tube
Q A1 With the second switch pipe
Q A4 Series connection is as a brachium pontis, the 3rd switching tube
Q B1 With the 4th switching tube
Q B4 Series connection is as a brachium pontis, the 5th switching tube
Q C1 With the 6th switching tube
Q C4 Series connection is as a brachium pontis; First switching tube during series connection
Q A1 Emitter and second switch pipe
Q A4 Collector electrode link to each other the 3rd switching tube
Q B1 Emitter and the 4th switching tube
Q B4 Collector electrode link to each other the 5th switching tube
Q C1 Emitter and the 6th switching tube
Q C4 Collector electrode link to each other; Again three brachium pontis are composed in parallel three-phase brachium pontis 2, first switching tube when in parallel
Q A1 , the 3rd switching tube
Q B1 , the 5th switching tube
Q C1 Collector electrode link to each other the second switch pipe
Q A4 , the 4th switching tube
Q B4 , the 6th switching tube
Q C4 Emitter link to each other.
Three bidirectional switchs 3 are respectively by the 7th switching tube
Q A2 With the 8th switching tube
Q A3 Series connection, the 9th switching tube
Q B2 With the tenth switching tube
Q B3 Series connection, the 11 switching tube
Q C2 Close pipe with twelvemo
Q C3 Be in series, the emitter of two switching tubes links to each other during series connection.
Half-bridge brachium pontis 4 is by the 13 switching tube
Q P1 With the 14 switching tube
Q P2 Be in series the 13 switching tube during series connection
Q P1 Emitter and the 14 switching tube
Q P2 Collector electrode link to each other.
Consisting of of rectification/inverter bridge leg 6: the 15 switching tube
Q S1 Close pipe with sixteenmo
Q S2 Series connection is as a brachium pontis, the 17 switching tube
Q S3 Close pipe with eighteenmo
Q S4 Series connection is as a brachium pontis; The 15 switching tube during series connection
Q S1 Emitter and sixteenmo close pipe
Q S2 Collector electrode link to each other the 17 switching tube
Q S3 Emitter and eighteenmo close pipe
Q S4 Collector electrode link to each other; Again two brachium pontis are composed in parallel rectification/inverter bridge leg 6, the 15 switching tube when in parallel
Q S1 , the 17 switching tube
Q S3 Collector electrode link to each other, sixteenmo closes pipe
Q S2 , eighteenmo closes pipe
Q S4 Emitter link to each other.
Exchange the side inductance with three
L a ,
L b ,
L c An end connect three-phase alternating-current supply when parallel network reverse (during rectification or) or threephase load when inversion (independent) respectively, the other end connects first switching tube respectively
Q A1 With the second switch pipe
Q A4 Series connection point, the 3rd switching tube
Q B1 With the 4th switching tube
Q B4 Series connection point, the 5th switching tube
Q C1 With the 6th switching tube
Q C4 Series connection point.Three-phase brachium pontis 2 is in parallel with half-bridge brachium pontis 4, first switching tube when in parallel
Q A1 Collector electrode and the 13 switching tube
Q P1 Collector electrode link to each other the second switch pipe
Q A4 Emitter and the 14 switching tube
Q P2 Emitter link to each other.With the 7th switching tube
Q A2 Collector electrode be connected on first switching tube
Q A1 With the second switch pipe
Q A4 Series connection point, with the 9th switching tube
Q B2 Collector electrode be connected on the 3rd switching tube
Q B1 With the 4th switching tube
Q B4 Series connection point, with the 11 switching tube
Q C2 Collector electrode be connected on the 5th switching tube
Q C1 With the 6th switching tube
Q C4 Series connection point; With the 8th switching tube
Q A3 Collector electrode, the tenth switching tube
Q B3 Collector electrode, twelvemo close pipe
Q C3 Collector electrode all be connected on isolating transformer 5 former limit windings end of the same name, isolating transformer 5 former limit winding different names terminate at the 13 switching tube
Q P1 With the 14 switching tube
Q P2 Series connection point.Isolating transformer 5 secondary windings termination the 15 switching tube of the same name
Q S1 Close pipe with sixteenmo
Q S2 Series connection point, secondary winding different name termination the 17 switching tube
Q S3 Close pipe with eighteenmo
Q S4 Series connection point.The DC side filter capacitor
C o In parallel with rectification/inverter bridge leg 6.The DC side filter capacitor
C o Can connect load (during rectification) and also can connect direct voltage source (during inversion).
Be example with the two-way AC/DC converter of single stage type isolated form three-phase among Fig. 1 below, narrate the concrete operation principle of the two-way AC/DC converter of single stage type isolated form three-phase in conjunction with Fig. 2-4 respectively.
Before analyzing, make the following assumptions: 1) all switching tubes and diode are desirable device; 2) all inductance, electric capacity and transformer are ideal element; 3) the DC side filter capacitor is enough big, can be similar to think a voltage source
V Dc ,
V Dc Be dc voltage.
During rectification, it is input side that converter exchanges side, connects the three-phase alternating current potential source, and DC side is outlet side, connects load.During inversion, the converter DC side is input side, connects direct voltage source, and the interchange side is outlet side, connects load or three-phase alternating current potential source.As shown in Figure 2, adopt dicyclo control strategy and the SVPWM modulator approach of outer voltage, current inner loop that converter is controlled.The effect of outer voltage is keep DC bus-bar voltage constant, and voltage regulator is output as the given signal of electric current.The effect of current inner loop be make the actual input current of converter can the floating voltage outer shroud electric current of output given, realize the control of unity power factor.In the specific implementation, owing to there is coupling under the three phase static coordinate system between the voltage and current, control is complicated, can adopt the feedforward decoupling control method based on the two-phase rotating coordinate system, to the electric current direct axis component under the two-phase rotating coordinate system
i d And quadrature axis component
i q Control respectively, namely active power and the reactive power of converter are carried out independent control, can simplify the design of control loop parameter.Above-mentioned control method has been widely used in present Three-Phase PWM Rectifier, the three-phase bridge type converter.But, owing to introduced high frequency transformer in the converter of the present invention, need to consider transformer magnetic reset problem, the specific implementation process of SVPWM modulation technique before also is not suitable for converter of the present invention, need make improvements, to guarantee that converter can normally move.
Fig. 3 is single stage type isolated form three-phase two-way AC/DC converter fundamental voltage space vector and sector division figure.Being divided into according to phase current direction and 6 non-zero basic voltage vectors is 12 sectors.Fig. 4 is the two-way AC/DC converter of single stage type isolated form three-phase sector 1 voltage vector-diagram.Below in conjunction with table 1 and Fig. 4 with sector 1 be example when the two-way AC/DC converter of single stage type isolated form three-phase is worked in the rectification pattern SVPWM modulator approach of (phase current and phase voltage same-phase) be specifically addressed:
Adopt
The formal definition on off state, wherein a, b, c represent the on off state of three bidirectional switchs of corresponding A, B, C three-phase respectively, d, e represent the on off state of two switching tubes of half-bridge brachium pontis 4.F represents the direction (direction of arrow is with reference to positive direction among Fig. 1) of transformer primary current.The corresponding space vector of each on off state.
The theoretical foundation of SVPWM is the mean value principle of equal effects, namely in a switch periods by basic voltage vectors is made up, its mean value is equated with given voltage vector.When voltage vector is positioned at sector 1, select adjacent reference voltage vector
,
And zero vector
Synthetic needed voltage vector.Therefore the expression formula of voltage vector is:
Wherein
Thus,
,
,
,
Can calculate and get, can obtain the switching tube drive waveforms of synthetic needed voltage vector in this sector again according to the conduction device of on off state correspondence in the table 1 and on off state transfer sequence.The voltage vector synthetic method of other 11 sectors can be by that analogy.
When the two-way AC/DC converter of single stage type isolated form three-phase works in the rectification pattern, first switching tube
Q A1 , the second switch pipe
Q A4 , the 3rd switching tube
Q B1 , the 4th switching tube
Q B4 , the 5th switching tube
Q C1 , the 6th switching tube
Q C4 , the 15 switching tube
Q S1 , sixteenmo closes pipe
Q S2 , the 17 switching tube
Q S3 , eighteenmo closes pipe
Q S4 Conduction device be anti-and diode, need not drive.
When the two-way AC/DC converter of single stage type isolated form three-phase works in inverter mode, phase current and phase voltage antiphase; Compare with the rectification pattern, variation has taken place, the 13 switching tube in corresponding conduction device
Q P1 , the 14 switching tube
Q P2 Conduction device be anti-and diode, need not drive; Each switching tube drive waveforms of converter SVPWM module output under two kinds of patterns will change, but the composition principle of above-mentioned voltage vector still is suitable for.In addition, in order to realize the seamless switching between rectification and the inverter mode, can adopt the dc voltage partitioned method, judge the mode of operation of converter with different dc voltage values.
The concrete application approach of the present invention is a lot, and the above only is preferred implementation of the present invention, should be understood that; for those skilled in the art; under the prerequisite that does not break away from the principle of the invention, can also make some improvement, these improvement also should be considered as protection scope of the present invention.
Table 1 sector 1 SVPWM operation principle
Claims (8)
1. two-way AC/DC converter of single stage type isolated form three-phase, it is characterized in that: comprise that three exchange side inductance (1), three-phase brachium pontis (2), three bidirectional switchs (3), half-bridge brachium pontis (4), isolating transformer (5), rectification/inverter bridge leg (6) and DC side filter capacitor (7), three brachium pontis mid points of three-phase brachium pontis (2) exchange side inductance (1) respectively and link to each other with a bidirectional switch (3) with one, the other end of three bidirectional switchs (3) all links to each other with isolating transformer (5) former limit winding end of the same name, half-bridge brachium pontis (4) is in parallel with three-phase brachium pontis (2), the brachium pontis mid point of half-bridge brachium pontis (4) links to each other with the former limit of isolating transformer (5) winding different name end, isolating transformer (5) secondary winding links to each other with two mid points of rectification/inverter bridge leg (6), and rectification/inverter bridge leg (6) is in parallel with DC side filter capacitor (7).
2. according to the two-way AC/DC converter of the described single stage type isolated form of claim 1 three-phase, it is characterized in that: described three-phase brachium pontis (2) is made up of six switching tubes, first switching tube
Q A1 Emitter and second switch pipe
Q A4 Collector electrode link to each other as a brachium pontis, the 3rd switching tube
Q B1 Emitter and the 4th switching tube
Q B4 Collector electrode link to each other as a brachium pontis, the 5th switching tube
Q C1 Emitter and the 6th switching tube
Q C4 Collector electrode link to each other as a brachium pontis, first switching tube
Q A1 , the 3rd switching tube
Q B1 , the 5th switching tube
Q C1 Collector electrode link to each other the second switch pipe
Q A4 , the 4th switching tube
Q B4 , the 6th switching tube
Q C4 Emitter link to each other.
3. according to the two-way AC/DC converter of the described single stage type isolated form of claim 1 three-phase, it is characterized in that: described three bidirectional switchs (3) are made up of six switching tubes, the 7th switching tube
Q A2 Emitter and the 8th switching tube
Q A3 Emitter be connected to form a bidirectional switch, the 9th switching tube
Q B2 Emitter and the tenth switching tube
Q B3 Emitter be connected to form a bidirectional switch, the 11 switching tube
Q C2 Emitter and twelvemo close pipe
Q C3 Emitter be connected to form a bidirectional switch.
4. according to the two-way AC/DC converter of the described single stage type isolated form of claim 1 three-phase, it is characterized in that: described half-bridge brachium pontis (4) is formed the 13 switching tube by two switching tubes
Q P1 Emitter and the 14 switching tube
Q P2 Collector electrode link to each other.
5. according to the two-way AC/DC converter of the described single stage type isolated form of claim 1 three-phase, it is characterized in that: described rectification/inverter bridge leg (6) is formed the 15 switching tube by four switching tubes
Q S1 Emitter and sixteenmo close pipe
Q S2 Collector electrode link to each other as a brachium pontis, the 17 switching tube
Q S3 Emitter and eighteenmo close pipe
Q S4 Collector electrode link to each other as a brachium pontis, the 15 switching tube
Q S1 , the 17 switching tube
Q S3 Collector electrode link to each other, sixteenmo closes pipe
Q S2 , eighteenmo closes pipe
Q S4 Emitter link to each other.
6. according to any two-way AC/DC converter of described single stage type isolated form three-phase of claim 2 to 5, it is characterized in that: described switching tube composes in parallel by a single-way switch pipe and a diode, the emitter of single-way switch pipe links to each other with the anode of diode when in parallel, and the collector electrode of single-way switch pipe links to each other with the negative electrode of diode.
7. according to the two-way AC/DC converter of the described single stage type isolated form of claim 6 three-phase, it is characterized in that: described diode is the parasitic diode of anti-and diode or the MOSFET of IGBT.
8. the SVPWM control method of the two-way AC/DC converter of the described single stage type isolated form of claim 1 three-phase is characterized in that: adopt
The formal definition on off state, a wherein, b, c represents corresponding A respectively, B, the on off state of three bidirectional switchs (3) of C three-phase, d, e represents the on off state of two switching tubes in the half-bridge brachium pontis (4), f represents isolating transformer (5) limit, Central Plains sense of current, every group of corresponding fundamental space vector of on off state, according to phase current direction and 6 non-zero basic voltage vectors a power frequency period being divided into 12 sectors, to carry out vector synthetic, when synthetic in each switch periods in the isolating transformer (5) primary current be that positive current equated with the time of negative current, with the magnetic reset of assurance transformer.
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| CN109039115A (en) * | 2018-08-07 | 2018-12-18 | 北京航空航天大学 | A kind of isolated converter of high-frequency AC and its uniform spaces Vector Modulation strategy |
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| CN105305855B (en) * | 2015-11-05 | 2018-10-12 | 南京航空航天大学 | Three-phase isolation type bidirectional AC-DC converter and its control method |
| CN106549597A (en) * | 2016-10-21 | 2017-03-29 | 南京航空航天大学 | A kind of two-way AC DC changers based on active-clamp magnetic reset |
| CN106712548A (en) * | 2017-02-28 | 2017-05-24 | 华南理工大学 | Three-phase single-stage buck-boost rectifier converter |
| CN106712548B (en) * | 2017-02-28 | 2020-11-24 | 华南理工大学 | Three-phase single-stage buck-boost rectifying converter |
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| CN109039115A (en) * | 2018-08-07 | 2018-12-18 | 北京航空航天大学 | A kind of isolated converter of high-frequency AC and its uniform spaces Vector Modulation strategy |
| CN108923671B (en) * | 2018-08-07 | 2020-07-03 | 中国航空工业集团公司雷华电子技术研究所 | Control method of three-phase isolation buck PFC rectifier |
| CN109039115B (en) * | 2018-08-07 | 2024-01-05 | 北京航空航天大学 | High-frequency AC isolated converter and unified space vector modulation strategy thereof |
| CN109104108A (en) * | 2018-09-19 | 2018-12-28 | 南京航空航天大学 | A kind of Sofe Switch type single stage type high-frequency isolation rectifier with active-clamp |
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