CN113328620B - Three-phase harmonic current injection type voltage-raising and voltage-dropping converter - Google Patents

Three-phase harmonic current injection type voltage-raising and voltage-dropping converter Download PDF

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Publication number
CN113328620B
CN113328620B CN202110655276.3A CN202110655276A CN113328620B CN 113328620 B CN113328620 B CN 113328620B CN 202110655276 A CN202110655276 A CN 202110655276A CN 113328620 B CN113328620 B CN 113328620B
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diode
phase
switch
power supply
voltage
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CN113328620A (en
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阚志忠
潘毅
王晓寰
牛栩卿
林恒伟
张纯江
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Yanshan University
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Yanshan University
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/005—Conversion of dc power input into dc power output using Cuk converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)

Abstract

The invention provides a three-phase harmonic current injection type voltage-raising and voltage-reducing converter which comprises an alternating current power supply module, a three-phase input inductor and a three-phase rectification circuit, wherein the alternating current power supply module comprises a first alternating current power supply Ua and a second alternating current power supply U b And a third AC power supply U c (ii) a The three-phase input inductor comprises a first filter inductor L f,a A second filter inductor L f,b And a third filter inductor L f,c (ii) a The three-phase rectification circuit comprises a first diode D 11 A second diode D 21 A third diode D 31 A fourth diode D 12 A fifth diode D 22 A sixth diode D 32 The seventh diode D b1 An eighth diode D b2 Harmonic current injection circuit and seventh switching tube S w1 The eighth switching tube S w2 A first energy storage capacitor C 1 A second energy storage capacitor C 2 A first inductor L D1 A second inductor L D2 A first capacitor C o And a load R. The invention is a single-stage non-isolated circuit structure, only two power switch tubes are in a high-frequency modulation state, only part of active power needs to be processed, and the loss caused by high switching frequency is favorably reduced.

Description

Three-phase harmonic current injection type voltage-raising and voltage-dropping converter
Technical Field
The invention relates to a three-phase power factor correction technology, in particular to a three-phase harmonic current injection type voltage-scalable voltage-drop converter.
Background
Modern science and technology develops rapidly, social productivity is greatly improved, energy consumption is fast, resources are exhausted due to over exploitation of fossil energy, environmental pollution is serious, and sustainable development of human beings is threatened. Green, clean and renewable alternative energy is used, the energy structure is optimized, and the excessive dependence on fossil energy is favorably reduced. The electric energy conversion is realized by a power converter, and power electronic equipment is a main harmonic source, so that the most effective method is to adopt a Power Factor Correction (PFC) technology for solving harmonic pollution and improving the performance of the converter.
The method mainly comprises three types, namely Buck, Boost and Buck-Boost, according to the analysis of the relation between input and output voltages of the converter. The output of the step-down converter can only be lower than the power supply voltage, and certain inherent dead zone exists in the input current, so that the power factor of the input end is reduced, and the harmonic distortion is serious. The boost converter generates an excessively high output voltage when the input voltage is high, which is not favorable for the design of the post-stage circuit and the selection of the device. The electric automobile is one of the most popular new energy industries in recent years, the voltage platform range of the mainstream pure electric passenger automobile in the domestic market is 275-550V, and the voltage platform range of the commercial automobile is 450-820V. The Buck-Boost PFC converter has the advantages that the output voltage can be adjusted, the use is flexible, the Buck-Boost PFC converter is very suitable for an electric vehicle charging platform, the voltage reduction or voltage boosting function can be executed by utilizing the unique topological structure, and the requirement of wide-range output voltage is met.
Disclosure of Invention
In order to solve the above-mentioned deficiencies of the prior art, the present invention provides a three-phase step-up/step-down AC/DC converter, which adopts a single-stage topology structure formed by combining a diode rectifier bridge and a post-stage step-up/step-down module, and utilizes a bidirectional switch to feed back harmonic current to an AC side, thereby reducing current distortion and simultaneously realizing power factor correction and output step-up/step-down.
In order to achieve the purpose, the invention adopts the following technical scheme:
in particular, the invention provides a three-phase harmonic current injection type voltage-scalable converter, which comprises an alternating current power supply module, a three-phase input inductor and a three-phase rectification circuit,
the alternating current power supply module comprises a first alternating current power supply Ua and a second alternating current power supply U b And a third AC power supply U c (ii) a The three-phase input inductor comprisesFirst filter inductor L f,a A second filter inductor L f,b And a third filter inductor L f,c (ii) a The three-phase rectification circuit comprises a first diode D 11 A second diode D 21 A third diode D 31 A fourth diode D 12 A fifth diode D 22 A sixth diode D 32 The seventh diode D b1 An eighth diode D b2 Harmonic current injection circuit and seventh switching tube S w1 The eighth switching tube S w2 A first energy storage capacitor C 1 A second energy storage capacitor C 2 A first inductor L D1 A second inductor L D2 A first capacitor C o And a load R;
the second AC power supply U b Is connected with the negative pole of the first alternating current power supply Ua; the third AC power supply U c And the negative electrode of the second alternating current power supply U b The negative electrodes are connected; the first filter inductor L f,a Is connected with the positive pole of the first alternating current power supply Ua; second filter inductor L f,b First terminal of and the second alternating current power supply U b The positive electrodes of the two electrodes are connected; the third filter inductor L f,c First terminal of and the third AC power supply U c The positive electrodes of the two electrodes are connected; the first diode D 11 Anode, fourth diode D 12 Negative pole and first filter inductance L f,a Is connected to a common point a; the second diode D 12 Anode, fifth diode D 22 Negative pole and second filter inductance L f,b Is connected to a common point b; the third diode D 13 Anode and sixth diode D 23 Negative pole and third filter inductance L f,c Is connected to a common point c; first diode D 11 A second diode D 21 A third diode D 31 And a seventh switching tube S w1 Collector electrode and first energy storage capacitor C 1 Is connected to a fourth diode D 12 A fifth diode D 22 A sixth diode D 32 Negative pole of (2) and eighth switching tube S w2 And a second energy storage capacitor C 2 Are connected with each other; the first end of the harmonic current injection circuit is respectively connected with a common point a, a common point b and a common point c, and a seventh switch tube S w1 Emitter electrode of, eighth switching tube S w2 Collector electrode of, and seventh diode D b1 Negative electrode of (1), eighth diode D b2 The anode of the harmonic current injection circuit and the second end of the harmonic current injection circuit are connected with an injection point y; seventh diode D b1 Positive electrode of (1), first inductance L D1 First terminal and first energy storage capacitor C 1 Is connected to the second terminal of the eighth diode D b2 Negative pole of (1), second inductance L D2 First terminal and second energy storage capacitor C 2 Are connected with each other; first inductance L D1 Second terminal, first capacitor C o And the upper end of the load R, a second inductance L D2 Second terminal, first capacitor C o Is connected with the lower end of the load R;
the harmonic current injection circuit comprises a first bidirectional switch S T1 A second bidirectional switch S T2 And a third bidirectional switch S T3 ，
The first bidirectional switch S T1 Is connected to the common point a; second bidirectional switch S T2 Is connected to the common point b; third bidirectional switch S T3 Is connected to a common point c, said first bidirectional switch S T1 A second bidirectional switch S T2 A third two-way switch S T3 Are connected to the injection point y.
Preferably, the first bidirectional switch S T1 A second bidirectional switch S T2 And a third bidirectional switch S T3 The power MOSFET is formed by connecting two power MOSFET tubes or two IGBT tubes in series in a reverse direction.
Preferably, the first bidirectional switch comprises a first switch tube S 1 And a second switching tube S 2 The first switch tube S 1 The collector of the first filter inductor is connected with the second end terminal of the first filter inductor; the second switch tube S 2 And the first switch tube S 1 Are connected.
Preferably, the second bidirectional switch comprises a third switching tubeS 3 And a fourth switching tube S 4 The third switch tube S 3 The collector of the second filter inductor is connected with the second end of the second filter inductor; the fourth switch tube S 4 And the third switch tube S 3 Are connected.
Preferably, the third bidirectional switch comprises a fifth switch tube S 5 And a sixth switching tube S 6 Collector S of the fifth switch tube 5 The right end of the third filter inductor is connected with the right end of the third filter inductor; sixth switching tube S 6 And the fifth switch tube S 5 Are connected.
Preferably, the collector of the second switching tube, the collector of the fourth switching tube and the collector of the sixth switching tube are connected to the injection point y.
Preferably, the power cycle is equally divided into twelve intervals according to the instantaneous value of the three-phase input voltage at any moment; at any moment, for the upper half bridge of the three-phase power frequency rectifier bridge, the corresponding diode is conducted when the instantaneous value of the voltage is maximum, for the lower half bridge of the rectifier bridge, the corresponding diode is conducted when the instantaneous value of the voltage is minimum, and the high-frequency switch tube S is used for switching on the diodes w1 And S w2 The output current of the control rectifier bridge tracks the phase of the input voltage, the harmonic current is fed back to the power supply with the minimum absolute value of the current voltage through the bidirectional switching tube, the dead zone of the input current is compensated, and when the two-phase current is controlled to track the phase voltage of the three-phase symmetrical input, the residual phase current can automatically track the phase voltage.
Preferably, the converter comprises four operation modes in one interval, wherein the operation mode 1 is a switch S w1 On, switch S w2 Turn-off, current flows from phase a to phase b and phase C, and capacitor C 2 Charging is carried out, and a capacitor C 1 Transmitting energy into a direct current bus capacitor;
the operating mode 2 being a switch S w2 On, switch S w1 Off, capacitance C 1 Charging is carried out, and a capacitor C 2 Transmitting energy into a direct current bus capacitor;
working mode 3 is switch S w1 And S w2 Are simultaneously conducted and poweredFeeling L f,a ,L f,b ,L f,c Storage energy, capacitor C 1 And C 2 Simultaneously discharging to the load;
the operating mode 4 being a switch S w1 And S w2 Turn off at the same time, capacitor C 1 And C 2 Charging is carried out, and an inductor L D1 ,L D2 The energy stored in (b) will be transferred to the dc bus.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention relates to a circuit topology with wide output voltage range, which adopts a three-phase uncontrolled rectifier bridge combined with a rear-stage Cuk module to realize the adjustment of the output voltage through the charging and discharging of an energy storage capacitor.
(2) Compared with the traditional three-phase uncontrolled rectifier bridge, the three-phase uncontrolled rectifier bridge has the advantages that the harmonic current feedback circuit is introduced, the current dead zone of the non-conducting phase can be compensated, and the power factor of the input end is improved.
(3) The invention adopts a single-stage non-isolated circuit structure, has small volume and light weight, only two power switch tubes are in a high-frequency modulation state, only partial active power needs to be processed, and the loss caused by high switching frequency is favorably reduced.
Drawings
FIG. 1 is a circuit topology of the present invention;
FIG. 2 is a schematic diagram of the structure of the input phase voltage and its 12 partitions;
FIG. 3 is a schematic diagram of the present invention in operating mode 1 at interval 3;
FIG. 4 is a schematic diagram of the operating mode 2 of the present invention in interval 3;
FIG. 5 is a schematic diagram of the operating mode 3 of the present invention in interval 3;
FIG. 6 is a schematic diagram of the operation mode 4 of the present invention in interval 3;
FIG. 7 is a diagram of voltage logic control signals;
FIG. 8 is a schematic diagram of voltage logic control signals for the high frequency switch;
FIG. 9 is a schematic diagram of voltage logic control signals for the bi-directional switch;
fig. 10 is a diagram illustrating the relationship between the switching control and the input current.
Detailed Description
Exemplary embodiments, features and aspects of the present invention will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
As shown in fig. 1, the present invention provides a three-phase harmonic current injection type scalable voltage-drop converter, which includes an ac power module, a three-phase input inductor, a three-phase rectification circuit, and a harmonic current injection circuit.
The AC power supply module comprises a first AC power supply Ua and a second AC power supply U b And a third AC power supply U c (ii) a The three-phase input inductor comprises a first filter inductor L f,a A second filter inductor L f,b And a third filter inductor L f,c (ii) a The three-phase rectification circuit comprises a first diode D 11 A second diode D 21 A third diode D 31 A fourth diode D 12 A fifth diode D 22 A sixth diode D 32 A seventh diode D b1 An eighth diode D b2 Harmonic current injection circuit and seventh switching tube S w1 The eighth switching tube S w2 A first energy storage capacitor C 1 A second energy storage capacitor C 2 A first inductor L D1 A second inductor L D2 A first capacitor C o And a load R.
Second AC power supply U b The negative electrode of the first alternating current power supply is connected with the negative electrode of the first alternating current power supply; third AC power supply U c The negative electrode of the first alternating current power supply is connected with the negative electrode of the second alternating current power supply; first filter inductor L f,a The left end of the first power supply is connected with the anode of the first alternating current power supply; second filter inductor L f,b The left end of the second power supply is connected with the anode of a second alternating current power supply; third filter inductor L f,c The left end of the third switch is connected with the anode of a third alternating current power supply.
The three-phase rectification circuit comprises a first diode D 11 A second diode D 21 A third diode D 31 A fourth diode D 12 A fifth diode D 22 A sixth diode D 32 The seventh diode D b1 An eighth diode D b2 Harmonic current injection circuit, seventh switching tube S w1 The eighth switching tube S w2 A first energy storage capacitor C 1 A second energy storage capacitor C 2 First inductance L D1 A second inductor L D2 First capacitor C o And a load R; first diode D 11 Anode, fourth diode D 12 The negative electrode and the right end of the first filter inductor are connected with a common point a; second diode D 12 Anode, fifth diode D 22 The negative electrode and the right end of the second filter inductor are connected with a common point b; third diode D 13 Anode and sixth diode D 23 The negative electrode and the right end of the third filter inductor are connected with a common point c; first diode D 11 A second diode D 21 A third diode D 31 Negative pole of (2) and seventh switching tube S w1 Collector electrode and first energy storage capacitor C 1 Is connected to the left end of a fourth diode D 12 A fifth diode D 22 A sixth diode D 32 Negative pole of (2) and eighth switching tube S w2 And a second energy storage capacitor C 2 The left ends of the two are connected; one end of the harmonic current injection circuit is connected with the common points a, b and c, and a seventh switching tube S w1 Emitter electrode of, eighth switching tube S w2 Collector electrode of, and seventh diode D b1 Negative electrode of (1), eighth diode D b2 The other end of the harmonic current injection circuit is connected with a common point y; the harmonic current injection circuit comprises a first bidirectional switch S T1 The left end of the first bidirectional switch is connected with a common point a; second bidirectional switch S T2 The left end of the second bidirectional switch is connected with a common point b; third bidirectional switch S T3 The left end of the third bidirectional switch is connected with the common point c, and the first bidirectional switch S T1 The second two-way openingOff S T2 A third two-way switch S T3 Is connected to the injection point y; wherein the first bidirectional switch comprises a first switch tube S 1 The collector of the first switch tube is connected with the right end of the first filter inductor; a second switch tube S 2 The emitting electrode of the second switching tube is connected with the emitting electrode of the first switching tube; the second bidirectional switch comprises a third switch tube S 3 The collector of the third switching tube is connected with the right end of the second filter inductor; fourth switch tube S 4 The emitting electrode of the fourth switching tube is connected with the emitting electrode of the third switching tube; the third bidirectional switch comprises a fifth switch tube S 5 The collector of the fifth switching tube is connected with the right side of the third filter inductor; sixth switching tube S 6 The emitter of the sixth switching tube is connected with the emitter of the fifth switching tube, and the collector of the second switching tube, the collector of the fourth switching tube and the collector of the sixth switching tube are connected to the injection point y; seventh diode D b1 Positive electrode of (1), first inductance L D1 Left end and first energy storage capacitor C 1 Is connected to the right end of the eighth diode D b2 Negative pole of (1), second inductance L D2 Left end and second energy storage capacitor C 2 Are connected with each other; first inductance L D1 Right end of (1), first capacitor C o And the upper end of the load R, a second inductance L D2 Right end of (1), first capacitor C o And the lower end of the load R.
Fig. 2 shows the input phase voltages and their 12 divisions.
Working mode 1 As shown in FIG. 3, it is a switch S w1 On, switch S w2 Turning off, the current flows from phase a to phase b and phase C, and the capacitor C 2 Charging is carried out, and a capacitor C 1 And transmitting the energy into the direct current bus capacitor.
Mode of operation 2 switch S, as shown in FIG. 4 w2 On, switch S w1 Off, capacitance C 1 Charging is carried out, and a capacitor C 2 And transmitting the energy into the direct current bus capacitor.
Mode of operation 3 switch S, as shown in FIG. 5 w1 And S w2 Are simultaneously conducted, and the inductance L f,a ,L f,b ,L f,c Storage energy, capacitor C 1 And C 2 While discharging to the load.
Mode 4 of operation As shown in FIG. 6, switch S w1 And S w2 Turn off at the same time, capacitor C 1 And C 2 Charging is carried out, and an inductor L D1 ,L D2 The energy stored in (b) will be transferred to the dc bus.
Fig. 7 shows a voltage logic control signal, fig. 8 shows a voltage logic control signal of a high frequency switch, fig. 9 shows a voltage logic control signal of a bidirectional switch, and fig. 10 shows a relationship between a switch control and an input current.
Finally, it should be noted that: the above-mentioned embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (6)

1. The utility model provides a three-phase harmonic current injection type can rise voltage drop converter which characterized in that: which comprises an alternating current power supply module, a three-phase input inductor and a three-phase rectifying circuit,
the alternating current power supply module comprises a first alternating current power supply U a A second AC power supply U b And a third AC power supply U c (ii) a The three-phase input inductor comprises a first filter inductor L f,a A second filter inductor L f,b And a third filter inductor L f,c (ii) a The three-phase rectification circuit comprises a first diode D 11 A second diode D 21 A third diode D 31 A fourth diode D 12 A fifth diode D 22 A sixth diode D 32 The seventh diode D b1 An eighth diode D b2 Harmonic current injection circuit and seventh switching tube S w1 The eighth switching tube S w2 A first energy storage capacitor C 1 The first stepTwo energy storage capacitors C 2 A first inductor L D1 A second inductor L D2 A first capacitor C o And a load R;
the second AC power supply U b And the negative electrode of the first alternating current power supply U a The negative electrodes are connected; the third AC power supply U c And the negative electrode of the second alternating current power supply U b The negative electrodes are connected; the first filter inductor L f,a And the first end of the first AC power supply U a The positive electrodes of the two electrodes are connected; second filter inductor L f,b First terminal of and the second AC power supply U b The positive electrodes of the two electrodes are connected; the third filter inductor L f,c First terminal of and the third alternating current power supply U c The positive electrodes of the two electrodes are connected; the first diode D 11 Anode, fourth diode D 12 Negative pole and first filter inductance L f,a Is connected to a common point a; the second diode D 21 Anode, fifth diode D 22 Negative pole and second filter inductance L f,b Is connected to a common point b; the third diode D 31 Anode and sixth diode D 32 Negative electrode and third filter inductor L f,c Is connected to a common point c; first diode D 11 A second diode D 21 A third diode D 31 Negative pole of (2) and seventh switching tube S w1 Collector electrode and first energy storage capacitor C 1 Is connected to a fourth diode D 12 A fifth diode D 22 A sixth diode D 32 Positive electrode of (2) and eighth switching tube S w2 And a second energy storage capacitor C 2 Are connected with each other; the first end of the harmonic current injection circuit is respectively connected with a common point a, a common point b and a common point c, and a seventh switch tube S w1 Emitter electrode of, eighth switching tube S w2 Collector electrode of, and seventh diode D b1 Negative electrode of (1), eighth diode D b2 The anode of the harmonic current injection circuit and the second end of the harmonic current injection circuit are connected with an injection point y; seventh diode D b1 Positive electrode of (1), first inductance L D1 First terminal and first energy storage capacitor C 1 Is connected to the second terminal of the eighth diode D b2 Negative pole of (1), second inductance L D2 First terminal and second energy storage capacitor C 2 Are connected with each other; first inductance L D1 Second terminal, first capacitor C o And the upper end of the load R, a second inductance L D2 Second terminal, first capacitor C o Is connected with the lower end of the load R;
the harmonic current injection circuit comprises a first bidirectional switch S T1 A second bidirectional switch S T2 And a third bidirectional switch S T3 ；
The first bidirectional switch S T1 Is connected to the common point a; second bidirectional switch S T2 Is connected to the common point b; third bidirectional switch S T3 Is connected to a common point c, said first bidirectional switch S T1 A second bidirectional switch S T2 A third two-way switch S T3 The second ends of the first and second connecting rods are connected to an injection point y;
dividing the power supply period into twelve intervals according to the magnitude of the instantaneous value of the three-phase input voltage at any moment; at any time, for the upper half bridge of the three-phase rectification circuit, the diode corresponding to the time of the maximum voltage instantaneous value is conducted, and for the lower half bridge of the three-phase rectification circuit, the diode corresponding to the time of the minimum voltage instantaneous value is conducted, and the high-frequency switch tube S is used for switching on w1 And S w2 The three-phase rectifying circuit is controlled to output current to track the phase of input voltage, harmonic current is fed back to a power supply with the minimum absolute value of the current voltage through the bidirectional switching tube, an input current dead zone is compensated, and when two-phase current is controlled to track the phase voltage of the three-phase symmetrical input, the remaining phase current can realize automatic tracking of the phase voltage;
the converter comprises four working modes in one interval, wherein the working mode 1 is a switch S w1 On, switch S w2 Turn-off, current flows from phase a to phase b and phase C, and capacitor C 2 Charging is carried out, and a capacitor C 1 Transmitting energy into a direct current bus capacitor;
the operating mode 2 being a switch S w2 On, switch S w1 Off, capacitance C 1 Charging is carried out, and a capacitor C 2 Transferring energy to direct currentA bus capacitor;
working mode 3 is switch S w1 And S w2 Are simultaneously conducted, and the inductance L f,a ,L f,b ,L f,c Storage energy, capacitor C 1 And C 2 Simultaneously discharging to the load;
the operating mode 4 being a switch S w1 And S w2 Turn off at the same time, capacitor C 1 And C 2 Charging is carried out, and an inductor L D1 ,L D2 The energy stored in (b) will be transferred to the dc bus.
2. The three-phase harmonic current injection scalable voltage-drop converter of claim 1, wherein: the first bidirectional switch S T1 A second bidirectional switch S T2 And a third bidirectional switch S T3 The power MOSFET is formed by connecting two power MOSFET tubes or two IGBT tubes in series in a reverse direction.
3. The three-phase harmonic current injection scalable voltage-drop converter of claim 2, wherein: the first bidirectional switch comprises a first switch tube S 1 And a second switching tube S 2 The first switch tube S 1 The collector of the first filter inductor is connected with the second end of the first filter inductor; the second switch tube S 2 And the first switch tube S 1 Are connected.
4. The three-phase harmonic current injection scalable voltage-drop converter of claim 3, wherein: the second bidirectional switch comprises a third switch tube S 3 And a fourth switching tube S 4 The third switch tube S 3 The collector of the second filter inductor is connected with the second end of the second filter inductor; the fourth switch tube S 4 And the third switch tube S 3 Are connected.
5. The three-phase harmonic current injection scalable voltage-drop converter of claim 4, wherein: the third bidirectional switch comprises a fifth switch tube S 5 And a sixth switching tube S 6 Collector S of the fifth switch tube 5 The second end of the third filter inductor is connected with the second end of the third filter inductor; sixth switching tube S 6 And the fifth switch tube S 5 Are connected.
6. The three-phase harmonic current injection scalable voltage-drop converter of claim 5, wherein: and the collector electrode of the second switching tube, the collector electrode of the fourth switching tube and the collector electrode of the sixth switching tube are connected to the injection point y.
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