CN103269178B - 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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- CN103269178B CN103269178B CN201310162162.0A CN201310162162A CN103269178B CN 103269178 B CN103269178 B CN 103269178B CN 201310162162 A CN201310162162 A CN 201310162162A CN 103269178 B CN103269178 B CN 103269178B
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000004804 winding Methods 0.000 claims abstract description 21
- 239000003990 capacitor Substances 0.000 claims abstract description 9
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- 239000013598 vector Substances 0.000 claims description 18
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- 230000003071 parasitic effect Effects 0.000 claims description 3
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- 238000002955 isolation Methods 0.000 abstract description 9
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- 238000005192 partition Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
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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 AC/DC converter, particularly relate 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 feature that is flexible, dispersion can make itself and bulk power grid for subsequent use each other, and power supply reliability is improved.But distributed power source unit cost of access is high, control difficulty.In order to reduce the impact of distributed power source to electrical network, when electric power system is broken down, distributed power source must be at once out of service, which greatly limits giving full play to of distributed power source, also indirectly limit the utilization to new forms of energy.In order to overcome the above problems, microgrid arises at the historic moment, and it has coordinated the contradiction between distributed power generation and bulk power grid, makes new and renewable sources of energy enter the New Times of scale application.Microgrid and bulk power grid be for subsequent use, cooperation each other, is conducive to the exploitation of new forms of energy, alleviates the power supply pressure of peak of power consumption period, improves power supply reliability and economy, is the Main way that Future New Energy Source utilizes development.
The micro-grid system structure of research both at home and abroad mainly contains and exchanges microgrid, direct-current micro-grid and alternating current-direct current mixing microgrid at present.In interchange microgrid, between ac bus and storage battery, need a two-way AC/DC converter, help storage battery to realize the effect of peak load shifting; In direct-current micro-grid, two-way AC/DC converter, as grid interface converter, realizes the mutual transmission of energy between electrical network and DC bus; In alternating current-direct current mixing microgrid, two-way AC/DC converter is the pivotal player bearing system capacity management function, is unique passage that interchange microgrid and direct-current micro-grid carry out energy transferring.In large-power occasions, usually consider to adopt the two-way AC/DC converter of three-phase, it is the key transformation device ensureing that microgrid normally runs.
The two-way AC/DC converter of three-phase adopts 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 in boosting characteristic, three-phase 380V alternating voltage direct voltage after its conversion reaches 600 ~ 800V usually, need to add after DC/DC converter carries out step-down in rear class just can receive on 380V DC bus, the two-way AC/DC converter of this three-phase is made to need two-layer configuration, electrical isolation can not be realized because of it simultaneously, need to use Industrial Frequency Transformer, cause it to have volume weight is large, cost is high shortcoming.
Summary of the invention
The object 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, solve the two-way AC/DC converter of three-phase in prior art and three-phase 380V alternating voltage is transformed to the problem that must adopt two-layer configuration when 380V direct voltage or 380V DC voltage conversion are three-phase 380V alternating voltage, realize electrical isolation simultaneously.
The technical scheme that the present invention is taked for achieving the above object is: the two-way AC/DC converter of a kind of single stage type isolated form three-phase, comprise three Inductors, three-phase brachium pontis, three bidirectional switchs, 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 are connected with one end of three Inductors respectively, three brachium pontis mid points of three-phase brachium pontis are also connected with one end of three bidirectional switchs respectively, the other end of three Inductors respectively with being often connected of three-phase alternating current, the other end all former with the isolating transformer limit Motor Winding Same Name of Ends of three bidirectional switchs is connected, half-bridge brachium pontis is in parallel with three-phase brachium pontis, the brachium pontis mid point of half-bridge brachium pontis is connected with isolating transformer former limit winding different name end, rectification/inverter bridge leg comprises two brachium pontis, isolating transformer vice-side winding Same Name of Ends is connected with one of them brachium pontis mid point of rectification/inverter bridge leg, isolating transformer vice-side winding different name end is connected with another brachium pontis mid point of rectification/inverter bridge leg, rectification/inverter bridge leg is in parallel with DC side filter capacitor.
Described three-phase brachium pontis is made up of six switching tubes, the emitter of the first switching tube is connected with the collector electrode of second switch pipe as a brachium pontis, the emitter of the 3rd switching tube is connected as a brachium pontis with the collector electrode of the 4th switching tube, the emitter of the 5th switching tube is connected as a brachium pontis with the collector electrode of the 6th switching tube, the collector electrode of the first switching tube, the 3rd switching tube, the 5th switching tube is connected, and the emitter of second switch pipe, the 4th switching tube, the 6th switching tube is connected.
Described three bidirectional switchs are made up of six switching tubes, the emitter of the 7th switching tube and the emitter of the 8th switching tube are connected to form a bidirectional switch, the emitter of the 9th switching tube and the emitter of the tenth switching tube are connected to form a bidirectional switch, and the emitter that the emitter of the 11 switching tube and twelvemo close pipe is connected to form a bidirectional switch; The brachium pontis mid point that the collector electrode of the 7th switching tube is connected with one end of Inductor, the collector electrode of the 7th switching tube is also in series with the first switching tube in three-phase brachium pontis and second switch pipe is connected; The brachium pontis mid point that the collector electrode of the 9th switching tube is connected with one end of Inductor, the collector electrode of the 9th switching tube is also in series with the 4th switching tube with the 3rd switching tube in three-phase brachium pontis is connected; The brachium pontis mid point that the collector electrode of the 11 switching tube is connected with one end of Inductor, the collector electrode of the 11 switching tube is also in series with the 6th switching tube with the 5th switching tube in three-phase brachium pontis is connected; The collector electrode that the collector electrode of the 8th switching tube, the collector electrode of the tenth switching tube, twelvemo close pipe is connected, and is connected with the Same Name of Ends of isolating transformer former limit winding.
Described half-bridge brachium pontis is made up of two switching tubes, and the emitter of the 13 switching tube is connected with the collector electrode of the 14 switching tube; The collector electrode of the 13 switching tube is connected with the collector electrode of the first switching tube, the 3rd switching tube, the 5th switching tube, and the emitter of the 14 switching tube is connected with the emitter of second switch pipe, the 4th switching tube, the 6th switching tube.
Described rectification/inverter bridge leg is made up of four switching tubes, the collector electrode that emitter and the sixteenmo of the 15 switching tube close pipe is connected as a brachium pontis, the collector electrode that emitter and the eighteenmo of the 17 switching tube close pipe is connected as a brachium pontis, the collector electrode of the 15 switching tube, the 17 switching tube is connected, and the emitter that sixteenmo closes pipe, eighteenmo closes pipe is connected.
Described switching tube is by a single-way switch pipe and a diodes in parallel composition, and time in parallel, the emitter of single-way switch pipe is connected with the anode of diode, and the collector electrode of single-way switch pipe is connected with the negative electrode of diode.
Described diode can be the anti-of IGBT and diode, 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 rectification mode, under inverter mode, have invert function.When the two-way AC/DC converter of single stage type isolated form three-phase works in rectification mode, the three-phase 380V alternating voltage of input is transformed to single-phase AC voltage by three-phase brachium pontis, half-bridge brachium pontis and bidirectional switch, is then 380V direct voltage by the step-down of isolating transformer, the rectifying conversion of rectification/inverter bridge leg; 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 AC voltage by the inversion of rectification/inverter bridge leg, the boosting inverter of isolating transformer, then is transformed to three-phase 380V alternating voltage by three-phase brachium pontis, half-bridge brachium pontis and bidirectional switch.The invention solves the two-way AC/DC converter of three-phase in prior art and three-phase 380V alternating voltage is transformed to the problem that must adopt two-layer configuration when 380V direct voltage or 380V DC voltage conversion are three-phase 380V alternating voltage, achieve the high frequency electrical isolation between constrained input simultaneously.In addition, the present invention also have that current on line side is sinusoidal wave, net side power factor controlling, the function such as the fast and buck output of the transmission of electric energy bidirectional high-efficiency, dynamic response.
Accompanying drawing explanation
Fig. 1 is single stage type isolated form three-phase of the present invention two-way AC/DC converter circuit structural representation.
Fig. 2 is single stage type isolated form three-phase of the present invention two-way AC/DC converter SVPWM control block diagram.
Fig. 3 is single stage type isolated form three-phase of the present invention two-way AC/DC converter fundamental voltage space vector and se ctor partition figure.
Fig. 4 is single stage type isolated form three-phase of the present invention two-way AC/DC converter 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 Inductors 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.Q in Fig. 1
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
s4for switching tube, Q
a1by a single-way switch pipe and diode D
a1be formed in parallel, Q
a4by a single-way switch pipe and diode D
a4be formed in parallel, Q
b1by a single-way switch pipe and diode D
b1be formed in parallel, Q
b4by a single-way switch pipe and diode D
b4be formed in parallel, Q
c1by a single-way switch pipe and diode D
c1be formed in parallel, Q
c4by a single-way switch pipe and diode D
c4be formed in parallel, Q
a2by a single-way switch pipe and diode D
a2be formed in parallel, Q
a3by a single-way switch pipe and diode D
a3be formed in parallel, Q
b2by a single-way switch pipe and diode D
b2be formed in parallel, Q
b3by a single-way switch pipe and diode D
b3be formed in parallel, Q
c2by a single-way switch pipe and diode D
c2be formed in parallel, Q
c3by a single-way switch pipe and diode D
c3be formed in parallel, Q
p1by a single-way switch pipe and diode D
p1be formed in parallel, Q
p2by a single-way switch pipe and diode D
p2be formed in parallel, Q
s1by a single-way switch pipe and diode D
s1be formed in parallel, Q
s2by a single-way switch pipe and diode D
s2be formed in parallel, Q
s3by a single-way switch pipe and diode D
s3be formed in parallel, Q
s4by a single-way switch pipe and diode D
s4be formed in parallel, time in parallel, the emitter of single-way switch pipe is connected with the anode of diode, and collector electrode is connected 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
s4can be the anti-of IGBT and diode, also can be the parasitic diode of MOSFET.When switching frequency is lower, adopt common rectifier diode; When switching frequency is higher, adopt fast recovery diode or Schottky diode.
Consisting of of three-phase brachium pontis 2: the first switching tube Q
a1with second switch pipe Q
a4connect as a brachium pontis, the 3rd switching tube Q
b1with the 4th switching tube Q
b4connect as a brachium pontis, the 5th switching tube Q
c1with the 6th switching tube Q
c4series connection is as a brachium pontis; First switching tube Q during series connection
a1emitter and second switch pipe Q
a4collector electrode be connected, the 3rd switching tube Q
b1emitter and the 4th switching tube Q
b4collector electrode be connected, the 5th switching tube Q
c1emitter and the 6th switching tube Q
c4collector electrode be connected; Again three brachium pontis are composed in parallel three-phase brachium pontis 2, the first switching tube Q time in parallel
a1, the 3rd switching tube Q
b1, the 5th switching tube Q
c1collector electrode be connected, second switch pipe Q
a4, the 4th switching tube Q
b4, the 6th switching tube Q
c4emitter be connected.
Three bidirectional switchs 3 are respectively by the 7th switching tube Q
a2with the 8th switching tube Q
a3series connection, the 9th switching tube Q
b2with the tenth switching tube Q
b3series connection, the 11 switching tube Q
c2pipe Q is closed with twelvemo
c3be in series, during series connection, the emitter of two switching tubes is connected.
Half-bridge brachium pontis 4 is by the 13 switching tube Q
p1with the 14 switching tube Q
p2be in series, the 13 switching tube Q during series connection
p1emitter and the 14 switching tube Q
p2collector electrode be connected.
Consisting of of rectification/inverter bridge leg 6: the 15 switching tube Q
s1pipe Q is closed with sixteenmo
s2connect as a brachium pontis, the 17 switching tube Q
s3pipe Q is closed with eighteenmo
s4series connection is as a brachium pontis; 15 switching tube Q during series connection
s1emitter and sixteenmo close pipe Q
s2collector electrode be connected, the 17 switching tube Q
s3emitter and eighteenmo close pipe Q
s4collector electrode be connected; Again two brachium pontis are composed in parallel rectification/inverter bridge leg 6, the 15 switching tube Q time in parallel
s1, the 17 switching tube Q
s3collector electrode be connected, sixteenmo closes pipe Q
s2, eighteenmo closes pipe Q
s4emitter be connected.
By three Inductor L
a, L
b, L
cone end connect three-phase alternating-current supply when parallel network reverse (during rectification or) or threephase load (during independent inversion) respectively, the other end meets the first switching tube Q respectively
a1with second switch pipe Q
a4series connection point, the 3rd switching tube Q
b1with the 4th switching tube Q
b4series connection point, the 5th switching tube Q
c1with the 6th switching tube Q
c4series connection point.Three-phase brachium pontis 2 is in parallel with half-bridge brachium pontis 4, the first switching tube Q time in parallel
a1collector electrode and the 13 switching tube Q
p1collector electrode be connected, second switch pipe Q
a4emitter and the 14 switching tube Q
p2emitter be connected.By the 7th switching tube Q
a2collector electrode be connected on the first switching tube Q
a1with second switch pipe Q
a4series connection point, by the 9th switching tube Q
b2collector electrode be connected on the 3rd switching tube Q
b1with the 4th switching tube Q
b4series connection point, by the 11 switching tube Q
c2collector electrode be connected on the 5th switching tube Q
c1with the 6th switching tube Q
c4series connection point; By the 8th switching tube Q
a3collector electrode, the tenth switching tube Q
b3collector electrode, twelvemo close pipe Q
c3collector electrode be all connected on isolating transformer 5 former limit Motor Winding Same Name of Ends, isolating transformer 5 former limit winding different name terminates at the 13 switching tube Q
p1with the 14 switching tube Q
p2series connection point.Isolating transformer 5 vice-side winding termination the 15 of the same name switching tube Q
s1pipe Q is closed with sixteenmo
s2series connection point, vice-side winding different name termination the 17 switching tube Q
s3pipe Q is closed with eighteenmo
s4series connection point.DC side filter capacitor C
oin parallel with rectification/inverter bridge leg 6.DC side filter capacitor C
oload (during rectification) can be connect and also can connect direct voltage source (during inversion).
Below for the two-way AC/DC converter of single stage type isolated form three-phase in Fig. 1, composition graphs 2-4 describes the specific works principle of the two-way AC/DC converter of single stage type isolated form three-phase respectively.
Before analysis, make the following assumptions: 1) all switching tubes and diode are ideal component; 2) all inductance, electric capacity and transformer are ideal element; 3) DC side filter capacitor is enough large, can be similar to and think a voltage source V
dc, V
dcfor DC voltage.
During rectification, converter AC is input side, connects three-phase alternating current potential source, and DC side is outlet side, connects load.During inversion, converter DC side is input side, connects direct voltage source, and AC is outlet side, connects load or three-phase alternating current potential source.As shown in Figure 2, the Double-loop Control Strategy of outer voltage, current inner loop and SVPWM method is adopted to control converter.The effect of outer voltage is the constant of maintenance DC bus-bar voltage, and the output of voltage regulator is the Setting signal of electric current.The effect of current inner loop is the given value of current that the actual input current floating voltage outer shroud of converter is exported, and realizes the control of unity power factor.In specific implementation, owing to there is coupling between voltage and current under three-phase static coordinate system, control complicated, the feed forward decoupling control method based on two-phase rotating coordinate system can be adopted, to the electric current direct axis component i under two-phase rotating coordinate system
dwith quadrature axis component i
qcontrol respectively, namely independent control is carried out to the active power of converter and reactive power, the design of control loop parameter can be simplified.Above-mentioned control method has been widely used in current Three-Phase PWM Rectifier, three-phase bridge type converter.But, owing to introducing high frequency transformer in converter of the present invention, need to consider transformer magnetic reset problem, the specific implementation process of SVPWM modulation technique before is not also suitable for converter of the present invention, needs make improvements, to ensure that converter can normally run.
Fig. 3 is single stage type isolated form three-phase two-way AC/DC converter fundamental voltage space vector and se ctor partition figure.12 sectors are divided into according to phase current direction and 6 non-zero basic voltage vectors.Fig. 4 is single stage type isolated form three-phase two-way AC/DC converter sector 1 voltage vector-diagram.When working in rectification mode for sector 1 to the two-way AC/DC converter of single stage type isolated form three-phase below in conjunction with table 1 and Fig. 4, the SVPWM method of (phase current and phase voltage same-phase) is specifically addressed:
Adopt
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, and d, e represent the on off state of two switching tubes of half-bridge brachium pontis 4.F represents the direction (in Fig. 1, the direction of arrow is reference positive direction) of primary side current of transformer.The corresponding space vector of each on off state.
The theoretical foundation of SVPWM is the mean value principle of equal effects, namely passes through to be combined basic voltage vectors in a switch periods, makes its mean value equal with given voltage vector.When voltage vector is positioned at sector 1, select adjacent reference voltage vector
and zero vector
voltage vector required for synthesis.Therefore the expression formula of voltage vector is:
Wherein
t
1+t
2+t
3+t
4＝T
s
T
1, t
2+ t
3determined by the angle of voltage vector, obtain by calculating.Because transformer secondary can think voltage source, the direction therefore flowing through transformer current determines the voltage direction at transformer two ends.In order to ensure the magnetic reset of transformer, just must ensure primary side current of transformer be positive time with for the negative time equal, namely
t
1+t
2＝t
3
Thus, t
1, t
2, t
3, t
4can calculate and obtain, then the switching tube drive waveforms of synthesizing required voltage vector in this sector can be obtained according to conduction device corresponding to table 1 breaker in middle state 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 rectification mode, the first switching tube Q
a1, 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
s4conduction 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; Compared with rectification mode, corresponding conduction device there occurs change, the 13 switching tube Q
p1, the 14 switching tube Q
p2conduction device be anti-and diode, need not drive; Converter each switching tube drive waveforms that SVPWM module exports in both modes will change, but the composition principle of above-mentioned voltage vector is still suitable for.In addition, in order to realize the seamless switching between rectification and inverter mode, the method for DC voltage subregion can be adopted, judging the mode of operation of converter with different DC voltage values.
Embody rule approach of the present invention is a lot, and the above is only the preferred embodiment of the present invention, should be understood that; for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvement, these improvement also should be considered as protection scope of the present invention.
Table 1 sector 1SVPWM operation principle
Claims (8)
1. the two-way AC/DC converter of single stage type isolated form three-phase, it is characterized in that: comprise three Inductors (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) are connected with one end of three Inductors (1) respectively, three brachium pontis mid points of three-phase brachium pontis (2) are also connected with one end of three bidirectional switchs (3) respectively, the other end of three Inductors (1) respectively with being often connected of three-phase alternating current, the other end of three bidirectional switchs (3) is all connected with isolating transformer (5) former limit Motor Winding Same Name of Ends, 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) is connected with isolating transformer (5) former limit winding different name end, rectification/inverter bridge leg (6) comprises two brachium pontis, isolating transformer (5) vice-side winding Same Name of Ends is connected with one of them brachium pontis mid point of rectification/inverter bridge leg, isolating transformer (5) vice-side winding different name end is connected with another brachium pontis mid point of rectification/inverter bridge leg, rectification/inverter bridge leg (6) is in parallel with DC side filter capacitor (7).
2. the two-way AC/DC converter of single stage type isolated form three-phase according to claim 1, is characterized in that: described three-phase brachium pontis (2) is made up of six switching tubes, the first switching tube Q
a1emitter and second switch pipe Q
a4collector electrode be connected as a brachium pontis, the 3rd switching tube Q
b1emitter and the 4th switching tube Q
b4collector electrode be connected as a brachium pontis, the 5th switching tube Q
c1emitter and the 6th switching tube Q
c4collector electrode be connected as a brachium pontis, the first switching tube Q
a1, the 3rd switching tube Q
b1, the 5th switching tube Q
c1collector electrode be connected, second switch pipe Q
a4, the 4th switching tube Q
b4, the 6th switching tube Q
c4emitter be connected.
3. the two-way AC/DC converter of single stage type isolated form three-phase according to claim 1, is characterized in that: described three bidirectional switchs (3) are made up of six switching tubes, the 7th switching tube Q
a2emitter and the 8th switching tube Q
a3emitter be connected to form a bidirectional switch, the 9th switching tube Q
b2emitter and the tenth switching tube Q
b3emitter be connected to form a bidirectional switch, the 11 switching tube Q
c2emitter and twelvemo close pipe Q
c3emitter be connected to form a bidirectional switch; 7th switching tube Q
a2collector electrode and Inductor L
aone end be connected, the 7th switching tube Q
a2collector electrode also with the first switching tube Q in three-phase brachium pontis (2)
a1with second switch pipe Q
a4brachium pontis mid point in series is connected; 9th switching tube Q
b2collector electrode and Inductor L
bone end be connected, the 9th switching tube Q
b2collector electrode also with the 3rd switching tube Q in three-phase brachium pontis
b1with the 4th switching tube Q
b4brachium pontis mid point in series is connected; 11 switching tube Q
c2collector electrode and Inductor L
cone end be connected, the 11 switching tube Q
c2collector electrode also with the 5th switching tube Q in three-phase brachium pontis
c1with the 6th switching tube Q
c4brachium pontis mid point in series is connected; 8th switching tube Q
a3collector electrode, the tenth switching tube Q
b3collector electrode, twelvemo close pipe Q
c3collector electrode be connected, and to be connected with the Same Name of Ends of isolating transformer (5) former limit winding.
4. the two-way AC/DC converter of single stage type isolated form three-phase according to claim 1, is characterized in that: described half-bridge brachium pontis (4) is made up of two switching tubes, the 13 switching tube Q
p1emitter and the 14 switching tube Q
p2collector electrode be connected; 13 switching tube Q
p1collector electrode and the first switching tube Q
a1, the 3rd switching tube Q
b1, the 5th switching tube Q
c1collector electrode be connected, the 14 switching tube Q
p2emitter and second switch pipe Q
a4, the 4th switching tube Q
b4, the 6th switching tube Q
c4emitter be connected.
5. the two-way AC/DC converter of single stage type isolated form three-phase according to claim 1, is characterized in that: described rectification/inverter bridge leg (6) is made up of four switching tubes, the 15 switching tube Q
s1emitter and sixteenmo close pipe Q
s2collector electrode be connected as a brachium pontis, the 17 switching tube Q
s3emitter and eighteenmo close pipe Q
s4collector electrode be connected as a brachium pontis, the 15 switching tube Q
s1, the 17 switching tube Q
s3collector electrode be connected, sixteenmo closes pipe Q
s2, eighteenmo closes pipe Q
s4emitter be connected.
6. the two-way AC/DC converter of single stage type isolated form three-phase according to claim 2 to 5 any one, it is characterized in that: described switching tube is by a single-way switch pipe and a diodes in parallel composition, time in parallel, the emitter of single-way switch pipe is connected with the anode of diode, and the collector electrode of single-way switch pipe is connected with the negative electrode of diode.
7. the two-way AC/DC converter of single stage type isolated form three-phase according to claim 6, is characterized in that: described diode is the parasitic diode of the anti-of IGBT diode or MOSFET.
8. a SVPWM control method for the two-way AC/DC converter of single stage type isolated form three-phase described in claim 1, is characterized in that: adopt
formal definition on off state, wherein a, b, c represent the on off state of three bidirectional switchs (3) of corresponding A, B, C three-phase respectively, as the 7th switching tube Q
a2with the 8th switching tube Q
a3during the bidirectional switch conducting formed, the value of a is 1, as the 7th switching tube Q
a2with the 8th switching tube Q
a3when the bidirectional switch formed turns off, the value of a is 0, as the 9th switching tube Q
b2with the tenth switching tube Q
b3during the bidirectional switch conducting formed, the value of b is 1, as the 9th switching tube Q
b2with the tenth switching tube Q
b3when the bidirectional switch formed turns off, the value of b is 0, as the 11 switching tube Q
c2pipe Q is closed with twelvemo
c3during the bidirectional switch conducting formed, the value of c is 1, as the 11 switching tube Q
c2pipe Q is closed with twelvemo
c3when the bidirectional switch formed turns off, the value of c is 0, d, e represent two switching tube Q in half-bridge brachium pontis (4)
p1, Q
p2on off state, work as Q
p1during conducting, the value of d is 1, to Q
p1during shutoff, the value of d is 0, work as Q
p2during conducting, the value of e is 1, to Q
p2during shutoff, the value of e is 0, f represents isolating transformer (5) limit, Central Plains sense of current, when primary current flows into isolating transformer (5) former limit Motor Winding Same Name of Ends, when flowing to different name end from former limit Motor Winding Same Name of Ends, represent electric current positive direction, f represents with "+", when primary current flows into isolating transformer (5) former limit winding different name end, when flowing to Same Name of Ends from former limit winding different name end, represent electric current negative direction, f represents with "-", often organize the corresponding fundamental space vector of on off state, 12 sectors are divided into carry out Vector modulation a power frequency period according to phase current direction and 6 non-zero basic voltage vectors, during synthesis, in each switch periods, in isolating transformer (5), primary current is that positive current is equal with the time of negative current, to ensure the magnetic reset of transformer.
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| CN109104108B (en) * | 2018-09-19 | 2024-06-28 | 南京航空航天大学 | Soft switch type single-stage high-frequency isolation rectifier with active clamp |
| CN109245592A (en) * | 2018-10-15 | 2019-01-18 | 深圳市安和威电力科技股份有限公司 | A kind of bi-directional power conversion AC-DC system and control method based on IGBT |
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