CN116131642B - Three-phase five-level rectifier - Google Patents
Three-phase five-level rectifier Download PDFInfo
- Publication number
- CN116131642B CN116131642B CN202310420014.8A CN202310420014A CN116131642B CN 116131642 B CN116131642 B CN 116131642B CN 202310420014 A CN202310420014 A CN 202310420014A CN 116131642 B CN116131642 B CN 116131642B
- Authority
- CN
- China
- Prior art keywords
- diode
- bridge arm
- phase bridge
- phase
- switching
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000003990 capacitor Substances 0.000 claims description 48
- 230000002457 bidirectional effect Effects 0.000 claims description 25
- 239000000725 suspension Substances 0.000 claims description 24
- 239000013598 vector Substances 0.000 description 25
- 238000000034 method Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 10
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
Abstract
The invention provides a three-phase five-level rectifier, and relates to the field of electronic power. Compared with the traditional three-phase five-level diode clamping type rectifier, the three-phase five-level rectifier shares the three-phase common circuit module, so that under the condition of guaranteeing the quality of an output waveform, active switching devices and diodes are saved, and the cost is obviously reduced.
Description
Technical Field
The invention relates to the technical field of electronic power, in particular to a three-phase five-level rectifier.
Background
Along with the rapid development of the technology of rapidly charging a power battery of a large-sized electric automobile and the technology of driving an electric car by using super-capacitor energy storage, the demand for a high-power rectifier with the rated power of 350kW and above is gradually increasing. Compared with a two-level rectifier, the multi-level rectifier has a plurality of advantages, and is not only suitable for various medium-voltage and high-voltage occasions, but also suitable for various high-power application fields.
The existing three-phase multi-level rectifier topology is formed by combining three single-phase multi-level rectifiers, and the number of power devices in the three-phase rectifier topology is three times that of the single-phase rectifiers. For example, a three-phase five-level diode-clamped rectifier topology consisting of three single-phase diode-clamped five-level rectifiers includes 18 switching devices and 24 diodes; the three-phase five-level flying capacitor type rectifier topology formed by three single-phase flying capacitor type five-level rectifier topologies comprises 18 switching devices, 6 diodes and 6 suspension capacitors; the three-phase five-level hybrid five-level rectifier topology consisting of three single-phase hybrid five-level rectifier topologies comprises 18 switching devices, 6 diodes and 3 floating capacitors.
As can be seen from the above description, the existing three-phase multi-level rectifier has a large number of active devices and high cost.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the invention provides a three-phase five-level rectifier, which solves the technical problem that the active devices in the existing three-phase multi-level rectifier are more in use.
(II) technical scheme
In order to achieve the above purpose, the invention is realized by the following technical scheme:
the invention provides a three-phase five-level rectifier, wherein the input side is connected with a three-phase alternating current input power supply, and the three-phase five-level rectifier comprises a first input filter inductor, a second input filter inductor, a third input filter inductor, an A-phase bridge arm, a B-phase bridge arm, a C-phase bridge arm, a three-phase public circuit module and a direct current output module; wherein,,
the three-phase common circuit module includes: the first switching tube, the second switching tube, the third switching tube, the fourth switching tube, the seventh diode, the eighth diode, the ninth diode, the twelfth diode, the first suspension capacitor and the second suspension capacitor; the first switching tube is connected in series to the fourth switching tube in turn, the first end of the first switching tube is connected with the positive pole of the eighth diode, the negative pole of the eighth diode is connected with the positive pole of the seventh diode, the negative pole of the seventh diode is connected with the positive pole of the direct current output module, the second end of the fourth switching tube is connected with the negative pole of the ninth diode, the positive pole of the ninth diode is connected with the negative pole of the twelfth diode, and the positive pole of the twelfth diode is connected with the negative pole of the direct current output module; the junction of the second switching tube and the third switching tube is connected with a voltage middle position point of the direct current output module; the first end of the first suspension capacitor is connected to the connection part of the seventh diode and the eighth diode, the second end of the first suspension capacitor is connected to the connection part of the first switching tube and the second switching tube, the first end of the second suspension capacitor is connected to the connection part of the third switching tube and the fourth switching tube, and the second end of the second suspension capacitor is connected to the connection part of the ninth diode and the twelfth diode;
the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm respectively comprise four connecting ends, wherein,
the first end of the A-phase bridge arm is an alternating current input end, the first end is connected with a three-phase alternating current input power supply through a first input filter inductor,
the first end of the B-phase bridge arm is an alternating current input end, the first end is connected with a three-phase alternating current input power supply through a second input filter inductor,
the first end of the C-phase bridge arm is an alternating current input end, the first end is connected with a three-phase alternating current input power supply through a third input filter inductor,
the second ends of the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm are connected to the connection part of the eighth diode and the first switching tube;
third ends of the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm are all connected to the connection part of the second switching tube and the third switching tube;
fourth ends of the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm are connected to the connection part of the fourth switching tube and the ninth diode;
the three-phase public circuit module, the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm are connected with a plurality of control ends, the alternating current input end of each phase bridge arm is disconnected or connected with the second end, the third end and the fourth end of each phase bridge arm under the control of the control signals connected with the control ends, and each phase bridge arm can respectively output V when being combined with the three-phase public circuit module dc /2，V dc /4，0，-V dc /4 and-V dc Five levels of/2, V dc Representing a dc voltage.
Preferably, in the phase a bridge arm, the first end is conducted unidirectionally to the second end, the fourth end is conducted unidirectionally to the first end, and the first end a and the third end I 3A The first two-way controllable switch circuit unit is connected with the second two-way controllable switch circuit unit, and the first two-way controllable switch circuit unit is controlled to control current to flow from the first end to the third end, or current to flow from the third end to the first end, or the first end and the third end are disconnected;
in the B-phase bridge arm, one-way conduction is realized from the first end to the second end, one-way conduction is realized from the fourth end to the first end, and the first end B and the third end I 3B The first and second controllable switch circuit units are connected through the second controllable switch circuit unit, and current is controlled to flow from the first end to the third end or flow from the third end to the first end or be disconnected between the first end and the third end through controlling the second controllable switch circuit unit;
in the C-phase bridge arm, one-way conduction is realized from the first end to the second end, one-way conduction is realized from the fourth end to the first end, and the first end C and the second endThree-terminal I 3C Is connected through a third bidirectional controllable switch circuit unit, and controls current to flow from the first end to the third end or current to flow from the third end to the first end or is disconnected between the first end and the third end by controlling the third bidirectional controllable switch circuit unit. Preferably, a diode is respectively connected between the first end and the second end of the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm, the anode of the diode is connected with the first end, and the cathode of the diode is connected with the second end;
and the first ends and the fourth ends of the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm are respectively connected with a diode, the negative electrodes of the diodes are connected with the first ends, and the positive electrodes of the diodes are connected with the fourth ends.
Preferably, the first bidirectional controllable switch circuit unit includes:
the two switching tubes are connected in such a way that the emitters of the two switching tubes are connected, and the collectors of the two switching tubes are respectively a first end and a third end of an A-phase bridge arm;
or alternatively, the first and second heat exchangers may be,
the two switching tubes are connected in a manner that the collectors of the two switching tubes are connected, and the emitters of the two switching tubes are respectively a first end and a third end of an A-phase bridge arm;
or alternatively, the first and second heat exchangers may be,
the switching tube and the four diodes are connected in such a way that the collector electrode of the switching tube is connected with the cathodes of the first diode and the third diode, the emitter electrode of the switching tube is connected with the anodes of the second diode and the fourth diode, the anode of the first diode is connected with the cathode of the second diode, the anode of the third diode is connected with the cathode of the fourth diode, the connection part of the first diode and the second diode is a first end of an A-phase bridge arm, and the connection part of the third diode and the fourth diode is a third end of the A-phase bridge arm;
or alternatively, the first and second heat exchangers may be,
the connection mode of the two switching tubes and the two diodes is that the collectors of the two switching tubes are respectively connected with the cathode of one diode, the emitters of the two switching tubes are respectively connected with the anode of the diode, and the connection positions of the emitters of the two switching tubes and the anodes of the two diodes are respectively the first end and the third end of the A-phase bridge arm.
Preferably, the second bidirectional controllable switch circuit unit includes:
the connection mode of the two switching tubes is that the emitters of the two switching tubes are connected, and the collectors of the two switching tubes are respectively a first end and a third end of a B-phase bridge arm;
or alternatively, the first and second heat exchangers may be,
the two switching tubes are connected in a manner that the collectors of the two switching tubes are connected, and the emitters of the two switching tubes are respectively a first end and a third end of a B-phase bridge arm;
or alternatively, the first and second heat exchangers may be,
the switching tube and the four diodes are connected in such a way that the collector electrode of the switching tube is connected with the cathodes of the first diode and the third diode, the emitter electrode of the switching tube is connected with the anodes of the second diode and the fourth diode, the anode of the first diode is connected with the cathode of the second diode, the anode of the third diode is connected with the cathode of the fourth diode, the connection part of the first diode and the second diode is a first end of a B-phase bridge arm, and the connection part of the third diode and the fourth diode is a third end of the B-phase bridge arm;
or alternatively, the first and second heat exchangers may be,
the connection mode of the two switching tubes and the two diodes is that the collectors of the two switching tubes are respectively connected with the cathode of one diode, the emitters of the two switching tubes are respectively connected with the anode of the diode, and the connection positions of the emitters of the two switching tubes and the anodes of the two diodes are respectively a first end and a third end of a B-phase bridge arm.
Preferably, the third bidirectional controllable switch circuit unit includes:
the connection mode of the two switching tubes is that the emitters of the two switching tubes are connected, and the collectors of the two switching tubes are respectively a first end and a third end of a C-phase bridge arm;
or alternatively, the first and second heat exchangers may be,
the connection mode of the two switching tubes is that the collectors of the two switching tubes are connected, and the emitters of the two switching tubes are respectively a first end and a third end of a C-phase bridge arm;
or alternatively, the first and second heat exchangers may be,
the switching tube and the four diodes are connected in such a way that the collector electrode of the switching tube is connected with the cathodes of the first diode and the third diode, the emitter electrode of the switching tube is connected with the anodes of the second diode and the fourth diode, the anode of the first diode is connected with the cathode of the second diode, the anode of the third diode is connected with the cathode of the fourth diode, the connection part of the first diode and the second diode is a first end of a C-phase bridge arm, and the connection part of the third diode and the fourth diode is a third end of the C-phase bridge arm;
or alternatively, the first and second heat exchangers may be,
the connection mode of the two switching tubes and the two diodes is that the collectors of the two switching tubes are respectively connected with the cathode of one diode, the emitters of the two switching tubes are respectively connected with the anode of the diode, and the connection positions of the emitters of the two switching tubes and the anodes of the two diodes are respectively a first end and a third end of a C-phase bridge arm.
Preferably, the first bidirectional controllable switch circuit unit, the second bidirectional controllable switch circuit unit and the third bidirectional controllable switch circuit unit adopt the same circuit.
Preferably, the first bidirectional controllable switch circuit unit, the second bidirectional controllable switch circuit unit and the third bidirectional controllable switch circuit unit adopt different circuits.
Preferably, the direct current output module comprises a first direct current voltage division capacitor, a second direct current voltage division capacitor and a load resistor;
the first end of the first direct current voltage dividing capacitor is connected with the positive electrode of the direct current output module;
the second end of the first direct current voltage-dividing capacitor is connected with the first end of the second direct current voltage-dividing capacitor, and the connection part is a voltage middle position of the direct current output module;
the second end of the second direct current voltage division capacitor is connected with the negative electrode of the direct current output module;
and two ends of the load resistor are respectively connected with the positive pole and the negative pole of the direct current output module.
(III) beneficial effects
The invention provides a three-phase five-level rectifier. Compared with the prior art, the method has the following beneficial effects:
compared with the traditional three-phase five-level diode clamping type rectifier, the three-phase five-level rectifier provided by the invention shares the three-phase common circuit module, so that the active switching devices and diodes are saved under the condition of ensuring the quality of output waveforms, and the cost is obviously reduced.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a conventional Vienna five-level rectifier;
FIG. 2 is a schematic diagram of a conventional diode clamped five-level rectifier;
FIG. 3 is a schematic diagram of a flying capacitor type five-level rectifier;
FIG. 4 is a schematic diagram of a conventional hybrid five-level rectifier;
FIG. 5 is a schematic diagram of a three-phase five-level rectifier according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a three-phase five-level rectifier according to another embodiment of the present invention;
fig. 7 to 9 are three forms of bidirectional controllable switching circuit units.
FIGS. 10-12 are circuit diagrams of three different forms of three-phase five-level rectifiers;
fig. 13 is a space vector diagram of the three-phase five-level rectifier shown in fig. 10.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
For convenience of description, the switching IGBT is used as a controllable (on and off) switching transistor in the embodiment of the present invention, but the switching transistor in the present invention is not limited to the IGBT. An IGBT will be described as an example. The first end of the IGBT refers to a collector, the second end refers to an emitter, and the control end refers to a grid. The control end of each switching tube in the embodiment of the invention applies a driving control signal. For brevity, the description is omitted. The power switch tube in the embodiment of the invention can also be realized by adopting other controllable switch tube devices besides IGBT, such as MOSFET. Meanwhile, in the embodiment of the invention, in order to ensure the normal operation of each switching device, a freewheeling diode needs to be connected in parallel to each switching device, the parallel connection direction of the freewheeling diode is related to the type of the switching device, and a technician can set according to the type of the switching device without limitation. If not illustrated, the switching device comprises by default a freewheeling diode, as will be pointed out in the present embodiment. In the embodiment of the invention, the output end of the three-phase five-level rectifier is connected in parallel with a load resistor.
According to the three-phase five-level rectifier, the technical problem that the use amount of active devices in the existing three-phase multi-level rectifier is large is solved, the active devices are saved, and the device cost is reduced.
The technical scheme in the embodiment of the application aims to solve the technical problems, and the overall thought is as follows:
multilevel rectifiers represent a potential in the field of new energy. 1) Higher voltages and power levels may be provided; 2) The harmonic performance of the converter can be further improved, and the power factor is improved; 3) Various losses of the power device in the topology can be reduced, and switching frequency and voltage stress of the device are reduced; 4) The current in the system is reduced by lifting the voltage in the system on the premise of ensuring the unchanged power, so that the problems of high current, high loss, difficult power distribution, high device voltage stress and the like in the design of a high-power charger are solved, and the multi-level rectifier is widely focused by people. An increasing number of multi-level rectifiers are used in medium, high voltage or high power applications, for example in megawatt level high power ac drives, using a scheme of multi-level rectifiers in series with multi-level rectifiers; multilevel rectifiers of more than three stages are also favored in electric aircraft applications.
Fig. 1 to 4 show four conventional five-level rectifier structures. Fig. 1 is a vienna type multi-level rectifier, fig. 2 is a diode clamped multi-level rectifier, fig. 3 is a flying capacitor type multi-level rectifier, and fig. 4 is a hybrid multi-level rectifier.
The traditional three-phase multi-level rectifier topology is formed by combining three single-phase multi-level rectifiers, and the number of power devices in the three-phase rectifier topology is three times that of the single-phase rectifiers. For example, a three-phase five-level diode-clamped rectifier topology consisting of three single-phase diode-clamped five-level rectifiers includes 18 switching devices and 24 diodes; the three-phase five-level flying capacitor type rectifier topology formed by three single-phase flying capacitor type five-level rectifier topologies comprises 18 switching devices, 6 diodes and 6 suspension capacitors; the three-phase five-level hybrid five-level rectifier topology formed by three single-phase hybrid five-level rectifier topologies comprises 18 switching devices, 6 diodes and 3 suspension capacitors; the overall cost of the device is relatively high. In high-voltage high-power occasions, the cost of an active device is higher than the total cost of the device, and the disadvantage is more remarkable. Secondly, the self-balancing control of the bus voltage division capacitor and the suspension capacitor cannot be realized by the partial topology, and in practical application, an additional balancing circuit is needed, so that the device cost is obviously increased, and the power density is reduced.
In order to solve the problems, compared with the traditional three-phase five-level diode clamping type rectifier, the three-phase five-level rectifier provided by the embodiment of the invention has the advantages that 8 active switching devices and 14 diodes are saved under the condition that the quality of an output waveform is ensured, and meanwhile, the rectifier does not need an additional capacitance balancing circuit, so that the device cost is effectively reduced.
In order to better understand the above technical solutions, the following detailed description will refer to the accompanying drawings and specific embodiments.
As shown in fig. 5, the three-phase five-level rectifier in the embodiment of the invention includes a three-phase ac input power supply, a first input filter inductor, a second input filter inductor, a third input filter inductor, an a-phase bridge arm, a B-phase bridge arm, a C-phase bridge arm, a three-phase common circuit module and a dc output module connected at an input side; wherein,,
the three-phase common circuit module includes: first switching tube S 1 Second switch tube S 2 Third switch tube S 3 Fourth switching tube S 4 And a seventh diodeD 7 Eighth diodeD 8 Ninth diodeD 9 Twelfth pole tubeD 10 A first suspension capacitor C 3 And a second suspension capacitor C 4 The method comprises the steps of carrying out a first treatment on the surface of the First switching tube S 1 To fourth switch S 4 The tubes being connected in series in turn, a first switching tube S 1 Is connected with an eighth diodeD 8 An eighth diodeD 8 Is connected with a seventh diodeD 7 Anode of (C) seventh diodeD 7 The negative pole of the fourth switching tube S is connected with the positive pole of the direct current output module 4 A second terminal connected to the ninth diodeD 9 A cathode, a ninth diodeD 9 Connection of the positive electrode twelfth electrode tube S 12 A twelfth electrode tube S 12 The positive electrode of the direct current output module is connected with the negative electrode of the direct current output module; second switching tube S 2 And a third switching tube S 3 A junction of the voltage intermediate point O of the direct current output module is connected; the first suspension capacitor C 3 Is connected to the seventh diodeD 7 And an eighth diodeD 8 The first suspension capacitor C 3 Is connected to the first switch tube S 1 And a second switching tube S 2 The second suspension capacitor C 4 Is connected to the third switching tube S 3 And a fourth switching tube S 4 The second suspension capacitor C 4 Is connected to the ninth diode D 9 And a twelfth polar tube D 10 Is connected with the connecting part of the connecting part;
the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm respectively comprise four connecting ends, wherein,
the first end of the A-phase bridge arm is an alternating current input end, the first end is connected with a three-phase alternating current input power supply through a first input filter inductor,
the first end of the B-phase bridge arm is an alternating current input end, the first end is connected with a three-phase alternating current input power supply through a second input filter inductor,
the first end of the C-phase bridge arm is an alternating current input end, the first end is connected with a three-phase alternating current input power supply through a third input filter inductor,
the second ends of the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm are connected to the connection part of the eighth diode and the first switching tube;
third ends of the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm are all connected to the connection part of the second switching tube and the third switching tube;
fourth ends of the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm are connected to the connection part of the fourth switching tube and the ninth diode;
the three-phase public circuit module, the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm are connected with a plurality of control ends, and the three-phase public circuit module, the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm are suitable for being disconnected or connected with the second end, the third end and the fourth end of each phase bridge arm under the control of control signals accessed by the control ends, and each phase bridge arm can respectively output five levels of Vdc/2, vdc/4,0, -Vdc/4 and-Vdc/2 by combining the three-phase public circuit module.
As shown in fig. 6, a diode is connected between the first end and the second end of the A, B, C three-phase bridge arm, where the anode of the diode is connected to the first end and the cathode of the diode is connected to the second end, i.e. at A, B, C, the three-phase bridge arms are all turned on unidirectionally from the first end to the second end. A. A diode is connected between the first end and the fourth end of the B, C three-phase bridge arm, wherein the cathode of the diode is connected with the first end, and the anode of the diode is connected with the fourth end, namely, at A, B, C three-phase bridge arm, the four-phase bridge arm is in unidirectional conduction from the fourth end to the first end. It should be noted that, in the implementation process, a unidirectional conductive circuit with other connection modes may be used.
In the A-phase bridge arm, a first diode D 1 Is connected with the first end A, the first diode D 1 Is connected to the eighth diode D 8 The joint of the first switch tube and the first switch tube; second diode D 2 A cathode of the second diode D is connected with the first terminal A 2 Is connected to the ninth diode D 9 And a fourth switching tube S 4 Is connected with the connecting part of the connecting part.
In the B-phase bridge arm, a third diode D 3 A third diode D connected to the positive electrode of the first terminal B 3 Is connected to the eighth diode D 8 The joint of the first switch tube and the first switch tube; fourth diode D 4 A cathode of the fourth diode D is connected with the first terminal B 4 Is connected to the ninth diode D 9 And a fourth switching tube S 4 Is connected with the connecting part of the connecting part.
In the C-phase bridge arm, a fifth diode D 5 A fifth diode D connected to the positive electrode of the first terminal C 5 Is connected to the eighth diode D 8 The joint of the first switch tube and the first switch tube; sixth diode D 6 A cathode of the first diode D is connected with the first terminal C 6 Is connected to the ninth diode D 9 And a fourth switching tube S 4 Is connected with the connecting part of the connecting part.
As can be seen from the above description, the second ends of the A, B, C three-phase bridge arms are all connected at the same position, and I is used 2ABC A representation; A. third ends of B, C three-phase bridge arms are all connected at the same position, I is used 3ABC A representation; A. the fourth ends of B, C three-phase bridge arms are all connected at the same position, I is used 4ABC A representation; the first ends are denoted by ABC, respectively.
As shown in fig. 7 to 9, the first bidirectional controllable switch circuit unit, the second bidirectional controllable switch circuit unit, and the third bidirectional controllable switch circuit unit each include three bidirectional controllable switch circuit units.
Wherein:
the first bidirectional controllable switching circuit unit comprises two switching tubes, the connection mode of the two switching tubes is that the emitting electrodes of the two switching tubes are connected, the collecting electrodes of the two switching tubes are respectively a first end and a third end of a A, B, C three-phase bridge arm (in the specific implementation process, the connection mode of the two switching tubes can also comprise that the collecting electrodes of the two switching tubes are connected, and the emitting electrodes of the two switching tubes are respectively a first end and a third end of a A, B, C three-phase bridge arm).
The second bidirectional controllable switching circuit unit comprises a switching tube and four diodes, wherein the connection mode is that the collector electrode of the switching tube is connected with the cathodes of the first diode and the third diode, the emitter electrode of the switching tube is connected with the anodes of the second diode and the fourth diode, the anode of the first diode is connected with the cathode of the second diode, the anode of the third diode is connected with the cathode of the fourth diode, the connection position of the first diode and the second diode is a first end of a A, B, C three-phase bridge arm, and the connection position of the third diode and the fourth diode is a third end of a A, B, C three-phase bridge arm.
The third bidirectional controllable switch circuit unit comprises two switch tubes and two diodes, wherein the connection mode is that the collectors of the two switch tubes are respectively connected with the cathode of one diode, the emitters of the two switch tubes are respectively connected with the anode of the diode, and the connection positions of the emitters of the two switch tubes and the anode of the two diodes are respectively a first end and a third end of a A, B, C three-phase bridge arm.
It should be noted that in the implementation process, the first, second and third bidirectional controllable switch circuit units may be the same type of bidirectional controllable switch circuit unit, or may be different types of bidirectional controllable switch circuit units. Specific circuit diagrams of the bidirectional controllable switch circuit units adopting the same type are shown in fig. 10 to 12.
As shown in fig. 10, the three-phase five-level rectifier consists of 2 direct current voltage-dividing capacitorsC 1 AndC 2 2 suspension capacitorsC 3 AndC 4 10 active power switching devicesS 1 ~S 10 And 10 diodesD 1 ~D 10 The composition is formed.RIs a direct current load, P, O, N respectively represent the positive pole, the middle point and the negative pole of direct current voltage,e a ，e b ，e c representing a three-phase ac input power source,Lfor input filter inductance, the DC voltage is expressed asV dc Capacitance, capacitanceC 1 AndC 2 is all of the voltage ofV dc 2, capacitanceC 3 AndC 4 is all of the voltage ofV dc /4，i a 、i b 、i c Three phases of input currents are respectively used.
S 1 、S 2 、S 3 、S 4 Is a three-phase common switch which is provided with a plurality of switches,D 1 、D 2 、S 5 、S 6 the bridge arm of the phase A is formed,D 3 、D 4 、S 7 、S 8 the bridge arm of the B phase is formed,D 5 、D 6 、S 9 、S 10 and C-phase bridge arms are formed. Three-phase input current using midpoint O of DC bus as reference pointi a 、i b 、i c ) With the inflow bridge arm positive, each phase of bridge arm combined with the three-phase common circuit module can respectively output five levelsV dc /2，V dc /4，0，-V dc 4 and-V dc /2。
As shown in fig. 13, the three-phase five-level rectifier has 73 operation modes (vectors) in total. In the modal analysis, five levels are used for the convenience of expressionV dc /2，V dc /4，0，-V dc 4 and-V dc And/2 is denoted by 4,3,2,1,0, respectively. The distribution of all vectors on a plane is shown in fig. 13. All vectors can be divided into five classes according to the difference in vector magnitudes. The 1 vector magnitude at the center is 0, which is called zero vector; a total of 12 vectors are distributed on the first hexagon, which can be divided into 6 groups,each group contains 2 redundant vectors and their vector length isV dc 6; a total of 24 vectors are distributed on the second hexagon, wherein the length of 18 vectors is as followsV dc 3, each group comprising 3 redundant vectors, 6 vectors having a length of
V dc 6, there are only 1 vector per group; a total of 24 vectors are distributed on the third hexagon, wherein 12 vectors have the length ofV dc 2, each group comprising 2 redundant vectors, 12 vectors having a length of +.>
V dc 6; 12 vectors are distributed on the outermost layer hexagon, wherein 6 vectors have a length of 2V dc 3, the other 6 vectors have a length +.>
V dc /3。
In the space vector diagram, the influence of the redundant vector on the voltages of the suspension capacitor and the bus capacitor is opposite, and the capacitor can be balanced by using the redundant vector. Therefore, the rectifier does not need an extra capacitance balancing circuit, and the cost is saved.
In summary, compared with the prior art, the method has the following beneficial effects:
1. compared with the traditional three-phase five-level diode clamping type rectifier, the three-phase five-level rectifier provided by the embodiment of the invention shares the three-phase common circuit module, so that the active switching devices and diodes are saved under the condition of ensuring the quality of output waveforms, and the cost is obviously reduced.
2. The three-phase five-level rectifier provided by the embodiment of the invention does not need an additional capacitance balancing circuit, so that the cost is saved.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the 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 scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. The three-phase five-level rectifier is characterized by comprising a first input filter inductor, a second input filter inductor, a third input filter inductor, an A-phase bridge arm, a B-phase bridge arm, a C-phase bridge arm, a three-phase public circuit module and a direct current output module; wherein,,
the three-phase common circuit module includes: the first switching tube, the second switching tube, the third switching tube, the fourth switching tube, the seventh diode, the eighth diode, the ninth diode, the twelfth diode, the first suspension capacitor and the second suspension capacitor; the first switching tube is connected in series to the fourth switching tube in turn, the first end of the first switching tube is connected with the positive pole of the eighth diode, the negative pole of the eighth diode is connected with the positive pole of the seventh diode, the negative pole of the seventh diode is connected with the positive pole of the direct current output module, the second end of the fourth switching tube is connected with the negative pole of the ninth diode, the positive pole of the ninth diode is connected with the negative pole of the twelfth diode, and the positive pole of the twelfth diode is connected with the negative pole of the direct current output module; the junction of the second switching tube and the third switching tube is connected with a voltage middle position point of the direct current output module; the first end of the first suspension capacitor is connected to the connection part of the seventh diode and the eighth diode, the second end of the first suspension capacitor is connected to the connection part of the first switching tube and the second switching tube, the first end of the second suspension capacitor is connected to the connection part of the third switching tube and the fourth switching tube, and the second end of the second suspension capacitor is connected to the connection part of the ninth diode and the twelfth diode;
the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm respectively comprise four connecting ends, wherein,
the first end of the A-phase bridge arm is an alternating current input end, the first end is connected with a three-phase alternating current input power supply through a first input filter inductor, in the A-phase bridge arm, the first end is conducted unidirectionally to the second end, the fourth end is conducted unidirectionally to the first end, and the first end A and the third end I are connected unidirectionally 3A The first two-way controllable switch circuit unit is connected with the second two-way controllable switch circuit unit, and the first two-way controllable switch circuit unit is controlled to control current to flow from the first end to the third end, or current to flow from the third end to the first end, or the first end and the third end are disconnected;
the first end of the B-phase bridge arm is an alternating current input end, the first end is connected with a three-phase alternating current input power supply through a second input filter inductor, in the B-phase bridge arm, the first end is conducted unidirectionally to the second end, the fourth end is conducted unidirectionally to the first end, and the first end B and the third end I are connected unidirectionally 3B The first and second controllable switch circuit units are connected through the second controllable switch circuit unit, and current is controlled to flow from the first end to the third end or flow from the third end to the first end or be disconnected between the first end and the third end through controlling the second controllable switch circuit unit;
the first end of the C-phase bridge arm is an alternating current input end, the first end is connected with a three-phase alternating current input power supply through a third input filter inductor, in the C-phase bridge arm, the first end is conducted unidirectionally to the second end, the fourth end is conducted unidirectionally to the first end, and the first end C and the third end I are conducted unidirectionally 3C Is connected with the first two-way controllable switch circuit unit by controlling the first two-way controllable switch circuit unitA tri-bidirectional controllable switching circuit unit controlling current to flow from the first terminal to the third terminal, or current to flow from the third terminal to the first terminal, or disconnection between the first terminal and the third terminal;
the second ends of the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm are connected to the connection part of the eighth diode and the first switching tube;
third ends of the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm are all connected to the connection part of the second switching tube and the third switching tube;
fourth ends of the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm are connected to the connection part of the fourth switching tube and the ninth diode;
the three-phase public circuit module, the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm are connected with a plurality of control ends, the alternating current input end of each phase bridge arm is disconnected or connected with the second end, the third end and the fourth end of each phase bridge arm under the control of the control signals connected with the control ends, and each phase bridge arm can respectively output V when being combined with the three-phase public circuit module dc /2，V dc /4，0，-V dc /4 and-V dc Five levels of/2, V dc Representing a dc voltage.
2. The three-phase five-level rectifier of claim 1, wherein a diode is respectively connected between the first end and the second end of the a-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm, the anode of the diode is connected with the first end, and the cathode of the diode is connected with the second end;
and the first ends and the fourth ends of the A-phase bridge arm, the B-phase bridge arm and the C-phase bridge arm are respectively connected with a diode, the negative electrodes of the diodes are connected with the first ends, and the positive electrodes of the diodes are connected with the fourth ends.
3. A three-phase five-level rectifier according to claim 2, wherein said first bi-directional controllable switching circuit unit comprises:
the two switching tubes are connected in such a way that the emitters of the two switching tubes are connected, and the collectors of the two switching tubes are respectively a first end and a third end of an A-phase bridge arm;
or alternatively, the first and second heat exchangers may be,
the two switching tubes are connected in a manner that the collectors of the two switching tubes are connected, and the emitters of the two switching tubes are respectively a first end and a third end of an A-phase bridge arm;
or alternatively, the first and second heat exchangers may be,
the switching tube and the four diodes are connected in such a way that the collector electrode of the switching tube is connected with the cathodes of the first diode and the third diode, the emitter electrode of the switching tube is connected with the anodes of the second diode and the fourth diode, the anode of the first diode is connected with the cathode of the second diode, the anode of the third diode is connected with the cathode of the fourth diode, the connection part of the first diode and the second diode is a first end of an A-phase bridge arm, and the connection part of the third diode and the fourth diode is a third end of the A-phase bridge arm;
or alternatively, the first and second heat exchangers may be,
the connection mode of the two switching tubes and the two diodes is that the collectors of the two switching tubes are respectively connected with the cathode of one diode, the emitters of the two switching tubes are respectively connected with the anode of the diode, and the connection positions of the emitters of the two switching tubes and the anode of the two diodes are respectively the first end and the third end of an A-phase bridge arm;
wherein, each switch tube is connected with a freewheel diode in parallel.
4. A three-phase five-level rectifier according to claim 2, wherein said second bi-directional controllable switching circuit unit comprises:
the connection mode of the two switching tubes is that the emitters of the two switching tubes are connected, and the collectors of the two switching tubes are respectively a first end and a third end of a B-phase bridge arm;
or alternatively, the first and second heat exchangers may be,
the two switching tubes are connected in a manner that the collectors of the two switching tubes are connected, and the emitters of the two switching tubes are respectively a first end and a third end of a B-phase bridge arm;
or alternatively, the first and second heat exchangers may be,
the switching tube and the four diodes are connected in such a way that the collector electrode of the switching tube is connected with the cathodes of the first diode and the third diode, the emitter electrode of the switching tube is connected with the anodes of the second diode and the fourth diode, the anode of the first diode is connected with the cathode of the second diode, the anode of the third diode is connected with the cathode of the fourth diode, the connection part of the first diode and the second diode is a first end of a B-phase bridge arm, and the connection part of the third diode and the fourth diode is a third end of the B-phase bridge arm;
or alternatively, the first and second heat exchangers may be,
the connection mode of the two switching tubes and the two diodes is that the collectors of the two switching tubes are respectively connected with the cathode of one diode, the emitters of the two switching tubes are respectively connected with the anode of the diode, and the connection positions of the emitters of the two switching tubes and the anode of the two diodes are respectively a first end and a third end of a B-phase bridge arm;
wherein, each switch tube is connected with a freewheel diode in parallel.
5. A three-phase five-level rectifier according to claim 2, wherein said third bi-directional controllable switching circuit unit comprises:
the connection mode of the two switching tubes is that the emitters of the two switching tubes are connected, and the collectors of the two switching tubes are respectively a first end and a third end of a C-phase bridge arm;
or alternatively, the first and second heat exchangers may be,
the connection mode of the two switching tubes is that the collectors of the two switching tubes are connected, and the emitters of the two switching tubes are respectively a first end and a third end of a C-phase bridge arm;
or alternatively, the first and second heat exchangers may be,
the switching tube and the four diodes are connected in such a way that the collector electrode of the switching tube is connected with the cathodes of the first diode and the third diode, the emitter electrode of the switching tube is connected with the anodes of the second diode and the fourth diode, the anode of the first diode is connected with the cathode of the second diode, the anode of the third diode is connected with the cathode of the fourth diode, the connection part of the first diode and the second diode is a first end of a C-phase bridge arm, and the connection part of the third diode and the fourth diode is a third end of the C-phase bridge arm;
or alternatively, the first and second heat exchangers may be,
the connection mode of the two switching tubes and the two diodes is that the collectors of the two switching tubes are respectively connected with the cathode of one diode, the emitters of the two switching tubes are respectively connected with the anode of the diode, and the connection positions of the emitters of the two switching tubes and the anodes of the two diodes are respectively a first end and a third end of a C-phase bridge arm;
wherein, each switch tube is connected with a freewheel diode in parallel.
6. A three-phase five-level rectifier according to claim 2, wherein the first, second and third bidirectional controllable switching circuit units use the same circuit.
7. A three-phase five-level rectifier according to claim 2, wherein the first, second and third bidirectional controllable switching circuit units are different circuits.
8. The three-phase five-level rectifier according to any one of claims 1 to 7, wherein the dc output module includes a first dc voltage dividing capacitor, a second dc voltage dividing capacitor, and a load resistor;
the first end of the first direct current voltage dividing capacitor is connected with the positive electrode of the direct current output module;
the second end of the first direct current voltage-dividing capacitor is connected with the first end of the second direct current voltage-dividing capacitor, and the connection part is a voltage middle position of the direct current output module;
the second end of the second direct current voltage division capacitor is connected with the negative electrode of the direct current output module;
and two ends of the load resistor are respectively connected with the positive pole and the negative pole of the direct current output module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310420014.8A CN116131642B (en) | 2023-04-19 | 2023-04-19 | Three-phase five-level rectifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310420014.8A CN116131642B (en) | 2023-04-19 | 2023-04-19 | Three-phase five-level rectifier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116131642A CN116131642A (en) | 2023-05-16 |
| CN116131642B true CN116131642B (en) | 2023-06-30 |
Family
ID=86304900
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310420014.8A Active CN116131642B (en) | 2023-04-19 | 2023-04-19 | Three-phase five-level rectifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116131642B (en) |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103036461B (en) * | 2011-09-29 | 2016-03-30 | 台达电子企业管理（上海）有限公司 | Three phase rectifier module, its system be suitable for and harmonic suppressing method |
| CN106100405A (en) * | 2016-06-30 | 2016-11-09 | 华东交通大学 | A kind of level quinque switch H bridge multi-electrical level inverter |
| CN108282103A (en) * | 2018-02-11 | 2018-07-13 | 许继电气股份有限公司 | A kind of five-electrical level inverter |
| 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 |
| CN109842307B (en) * | 2019-02-21 | 2021-03-23 | 三峡大学 | Direct power boundary control method based on three-phase three-opening two-level rectifier |
| CN110855163A (en) * | 2019-11-19 | 2020-02-28 | 南京航空航天大学 | Single-stage isolated three-phase rectifier and control method thereof |
| CN111130364A (en) * | 2019-12-31 | 2020-05-08 | 北京交通大学 | Three-phase rectifier |
| CN112865587B (en) * | 2021-01-28 | 2022-05-06 | 三峡大学 | Single-phase three-level rectifier of double-barrelled T type bridge |
| CN114285301B (en) * | 2021-08-11 | 2023-07-28 | 湖南大学 | Five-level rectifying circuit |
| CN115940601A (en) * | 2023-01-18 | 2023-04-07 | 华中科技大学 | Hybrid rectifier and control method |
-
2023
- 2023-04-19 CN CN202310420014.8A patent/CN116131642B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN116131642A (en) | 2023-05-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109194170A (en) | A kind of seven electrical level inverters using switched-capacitor circuit | |
| CN110247568B (en) | Three-phase diode clamping type three-level double-output inverter topological structure | |
| CN104617803A (en) | Multi-level converter submodule as well as inverter circuit and MMC topology both manufactured from such submodule | |
| WO2022188255A1 (en) | Topology structure for series-connected mmc converters with small number of modules | |
| CN106100405A (en) | A kind of level quinque switch H bridge multi-electrical level inverter | |
| CN108471250B (en) | Five-level topological structure for power conversion system | |
| CN108173442A (en) | Isolated form Modular multilevel converter based on High Frequency Link technology | |
| CN106169885A (en) | A kind of tandem type six switchs multi-electrical level inverter | |
| CN117458904A (en) | Hybrid inverter of heterogeneous power device and space vector modulation method thereof | |
| CN102420538B (en) | Diode clamping seven-level DC-AC (direct current and alternate current) transformation circuit | |
| CN102437761B (en) | Single-phase full bridge three-level inverter and three-phase three-level inverter | |
| CN116131642B (en) | Three-phase five-level rectifier | |
| CN114257107B (en) | NPC type three-level inverter circuit | |
| CN112701905B (en) | Single-phase three-level power factor correction circuit based on pseudo totem-pole structure | |
| CN111900886B (en) | Flexible direct current transmission converter | |
| CN208723806U (en) | A kind of cascade multilevel inverter | |
| CN116155124B (en) | Three-phase five-level inverter | |
| CN102427307B (en) | Three-phase four-wire three-level inverter | |
| CN110311583A (en) | A kind of four level circuit topological structures for power conversion system | |
| CN110661433A (en) | Power electronic transformer | |
| CN116345929A (en) | Low-cost three-phase five-level rectifier | |
| CN113395003B (en) | Multi-level active neutral point clamped inverter series IGBT voltage-sharing circuit | |
| CN113206601B (en) | Direct current charger based on single-phase II type three-level pseudo totem pole | |
| CN215072188U (en) | SiC/Si mixed three-phase three-level ANPC inverter topological structure | |
| CN118041104B (en) | High-voltage seven-level energy storage conversion device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |