CN219372306U - Five-phase four-level hybrid clamping converter - Google Patents
Five-phase four-level hybrid clamping converter Download PDFInfo
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- CN219372306U CN219372306U CN202320163946.4U CN202320163946U CN219372306U CN 219372306 U CN219372306 U CN 219372306U CN 202320163946 U CN202320163946 U CN 202320163946U CN 219372306 U CN219372306 U CN 219372306U
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Abstract
The utility model discloses a five-phase four-level hybrid clamping converter which comprises five single-phase four-level hybrid clamping converters connected in parallel, a first capacitor, a second capacitor and a third capacitor, wherein each single-phase four-level hybrid clamping converter comprises four power terminals and an output terminal, the first power terminal is connected with a first pole of the first capacitor, the second power terminal is connected with a second pole of the first capacitor and a first pole of the second capacitor, the third power terminal is connected with a second pole of the second capacitor and a first pole of the third capacitor, the fourth power terminal is connected with a second pole of the third capacitor, and the first, second and third capacitors are connected in series. The utility model can realize low-voltage high-power speed regulation by using low-power class devices. The torque ripple is optimized, and the motor operation efficiency is improved. Has stronger fault tolerance capability. The voltage level can be improved, the output current waveform is more similar to a sine wave, the harmonic content is less, and the output capacity is large. Built-in switch redundancy allows additional degrees of freedom to achieve capacitor voltage balancing and output current regulation.
Description
Technical Field
The utility model relates to a topological structure of a power electronic multi-level converter, in particular to a five-phase four-level hybrid clamping converter.
Background
Currently, common clamp multi-level topologies mainly include diode clamp, capacitor clamp, active neutral point clamp, and general clamp multi-level topologies. Among them, the diode clamping type structure is widely used in industry, such as a five-level bridge arm structure diode clamping type multi-level topology.
The defects of the existing clamping type multi-level topological market products are as follows:
1. the three-phase permanent magnet synchronous motor has few controllable dimensions, the controllable dimensions are equal to the number of phases of the motor, the control freedom degree is low, the torque pulsation is larger due to space harmonic magnetomotive force generated by fundamental wave current, and the control performance is limited. Meanwhile, in high-power application occasions, higher power supply voltage is required, devices with high power levels are required, and cost is increased.
2. The traditional two-level converter has the defects of less output voltage level number, larger switching loss and higher current harmonic wave, and is not beneficial to high-power motor driving.
3. In the multi-level converter, the conventional topologies are a neutral point clamped converter, a flying capacitor converter and a cascaded H-bridge converter, wherein the use of the neutral point clamped converter, the flying capacitor converter requires a large increase in the number of clamping diodes and clamping capacitors, and the use of the cascaded H-bridge converter requires a large number of isolated power supplies, which makes the multi-level converter complex.
Disclosure of Invention
The aim of the utility model is achieved by the following technical scheme.
The utility model provides a five-phase four-level hybrid clamping converter, which comprises five single-phase four-level hybrid clamping converters connected in parallel, a first capacitor, a second capacitor and a third capacitor, wherein,
each single-phase four-level hybrid clamp converter comprises four power terminals and an output terminal, wherein the first power terminal is connected with a first pole of a first capacitor, the second power terminal is connected with a second pole of the first capacitor and a first pole of a second capacitor, the third power terminal is connected with a second pole of the second capacitor and a first pole of a third capacitor, the fourth power terminal is connected with a second pole of the third capacitor, and the first capacitor, the second capacitor and the third capacitor are connected in series.
Further, the first power terminal is also connected with the positive electrode of the power supply.
Further, the fourth power terminal is also connected with a negative electrode of the power supply.
Further, the output terminal of each single-phase four-level hybrid clamping converter is connected with five phase ends of the five-phase permanent magnet synchronous motor in a one-to-one correspondence manner.
Further, each of the single-phase four-level hybrid clamp converters includes eight switching devices including a main switch S 1 ,S 3 ,S 4 ,Clamp switch->And S is 2 And a clamp capacitor.
Further, a switching device S 1 Emitter-connected switching device of (a)And at the collector of the switching device S 1 And a switching device->Between which the switching device S is connected 3 Collector of (a), switching device S 3 Emitter-connected switching device S 4 A collector electrode of (a); switching device S 2 Emitter-connected switching device->And at the collector of the switching device S 2 And a switching device->A switching device is connected between->Emitter of (2), switching device->Collector-connected switching device->An emitter of (a); in the switching device S 3 、S 4 Is a common terminal and switching device->The clamping capacitor C4 and the switching device S are connected in parallel between the common terminals of the two 4 Emitter and switching device->After the collector electrode of the capacitor is connected, an output terminal is led out.
Further, in the switching device S 1 、S 2 The collector of the first and third power terminals are led out respectively, and the switching deviceThe emitters of which are respectively led out of the second power terminal and the fourth power terminal.
Further, the switching device S 1 Andswitching device S 2 And->Switching device S 3 And->Switching device S 4 And->Respectively operate in a complementary manner.
Further, the switching device S 1 And S is 2 In-phase operation, the switching deviceAnd->And also operates in phase.
The utility model has the advantages that:
1. the five-phase permanent magnet synchronous motor increases the number of motor phases, reduces the requirement on the capacity of each phase of the inverter, and can realize low-voltage high-power speed regulation by using low-power class devices under high-power application occasions. The space harmonic magnetomotive force is a direct cause of torque pulsation, and as the number of phases increases, the frequency of the space harmonic magnetomotive force generated by the fundamental wave current of the multi-phase motor is increased, and the amplitude is reduced, so that the torque pulsation is optimized, and the running efficiency of the motor is also improved. The method has stronger fault tolerance and improves reliability. Due to the redundancy of the number of phases of the multiphase motor, when one or several phases of the multiphase motor or multiphase inverter fail, an appropriate control strategy can be employed such that the motor is run at reduced power in case of a phase failure without restarting or stopping. The control resources of the multiphase motor are more, and the control flexibility is higher.
2. A novel four-level hybrid clamp converter for medium voltage motor drive, which contains only eight switches, the nominal voltage across the upper and lower dc link capacitors is the same as the flying capacitor, so each switch is subjected to the same voltage stress. On the other hand, in order to increase the voltage level, an extra capacitor is inserted into the direct current link, each phase can output four voltage levels, and the four-level converter can improve the voltage level, so that the output current waveform is more similar to a sine wave, the harmonic content is less, and the output capacity is large.
3. The high voltage flying capacitor near the DC link is replaced by two clamping switches, thus reducing the size and weight. Built-in switch redundancy allows additional degrees of freedom to achieve capacitor voltage balancing and output current regulation.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
fig. 1 shows a schematic diagram of a five-phase four-level hybrid clamp converter in accordance with an embodiment of the present utility model.
Fig. 2 shows a schematic diagram of a single-phase four-level hybrid clamp converter in accordance with an embodiment of the present utility model.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
As shown in fig. 1, the five-phase four-level hybrid clamp converter according to the embodiment of the present utility model includes five single-phase four-level hybrid clamp converters connected in parallel, each of which includes four power terminals and one output terminal. In each single-phase four-level hybrid clamp converter, the first power terminal is connected with the first pole of the capacitor C1 and the positive pole of the power supply, the second power terminal is connected with the second pole of the capacitor C1 and the first pole of the capacitor C2, the third power terminal is connected with the second pole of the capacitor C2 and the first pole of the capacitor C3, the fourth power terminal is connected with the second pole of the capacitor C3 and the negative pole of the power supply, and the capacitors C1, C2 and C3 are connected in series. The output terminals of each single-phase four-level hybrid clamping converter are connected with five phase ends of the five-phase permanent magnet synchronous motor in a one-to-one correspondence manner. The detailed constituent structure of each single-phase four-level hybrid clamp converter is further detailed in fig. 2.
As shown in fig. 2, each single-phase four-level hybrid clamp converter includes eight switching devices, external switches S 1 ,S 3 ,S 4 ,Is a main switch->And S is 2 Is a clamp switch. And a clamp capacitor C4, switching device S 1 Emitter-connected switching device->And at the collector of the switching device S 1 And a switching device->Between which the switching device S is connected 3 Collector of (a), switching device S 3 Emitter-connected switching device S 4 A collector electrode of (a); switching device S 2 Emitter connection switch of (a)Device->And at the collector of the switching device S 2 And a switching device->A switching device is connected between->Emitter of (2), switching device->Collector-connected switching device->An emitter of (a); in the switching device S 3 、S 4 Is a common terminal and switching device->Clamping capacitor C4 and switching device S connected in parallel between the common terminals of (a) 4 Emitter and switching device->After the collector electrode of (a) is connected, an output terminal is led out to output current i a . In the switching device S 1 、S 2 The collector of which is led out of the first and the third power terminals respectively, the switching device +.>The emitters of which are respectively led out of the second power terminal and the fourth power terminal. The first power terminal and the second power terminal are respectively connected with the two poles of the capacitor C1, the third power terminal and the fourth power terminal are respectively connected with the two poles of the capacitor C3, the second power terminal and the third power terminal are also respectively connected with the two poles of the capacitor C2, and the capacitors C1, C2 and C3 are connected in series.
The working principle of the four-level hybrid clamping converter is as follows: in fig. 2, switch S 1 ,S 3 ,S 4 ,Is a main switch->And S is 2 Is a clamp switch. If the dc-link voltage is assumed to be constant and equal to 3E, where E is the voltage across flying capacitor C4, then the voltages across the three dc-link capacitors (C1, C2, and C3) are all E. In order to output four voltage levels, the following operating rules should be complied with:
1. switch S 1 Andswitch S 2 And->Switch S 3 And->Switch S 4 And->Should operate in a complementary manner, respectively.
2. Switch S 1 And S is 2 Should be operated in phase, and switchAnd->Should also operate in phase.
The negative DC link voltage point is used as reference voltage, and a phase output voltage U aN The relationship with the converter switch states is shown in table 1. In table 1, "1" indicates an on state of the power switch, and "0" indicates an off state.
TABLE 1
| S 1 | S 2 | S 3 | S 4 | U aN |
| 0 | 0 | 0 | 0 | 0 |
| 0 | 0 | 0 | 1 | U dc /3 |
| 0 | 0 | 1 | 0 | U dc /3 |
| 1 | 1 | 0 | 0 | U dc /3 |
| 0 | 0 | 1 | 1 | 2U dc /3 |
| 1 | 1 | 0 | 1 | 2U dc /3 |
| 1 | 1 | 1 | 0 | 2U dc /3 |
| 1 | 1 | 1 | 1 | U dc |
In the utility model, the five-phase permanent magnet synchronous motor increases the motor phase number, reduces the requirement on the capacity of each phase of the inverter, and can realize low-voltage high-power speed regulation by using a low-power class device under the high-power application occasion. The space harmonic magnetomotive force is a direct cause of torque pulsation, and as the number of phases increases, the frequency of the space harmonic magnetomotive force generated by the fundamental wave current of the multi-phase motor is increased, and the amplitude is reduced, so that the torque pulsation is optimized, and the running efficiency of the motor is also improved. The method has stronger fault tolerance and improves reliability. Due to the redundancy of the number of phases of the multiphase motor, when one or several phases of the multiphase motor or multiphase inverter fail, an appropriate control strategy can be employed such that the motor is run at reduced power in case of a phase failure without restarting or stopping. The control resources of the multiphase motor are more, and the control flexibility is higher.
In the utility model, the novel four-level hybrid clamping converter for medium voltage motor drive only comprises eight switches, and the nominal voltage of the two ends of the upper direct current link capacitor and the lower direct current link capacitor is the same as that of the flying capacitor, so that each switch bears the same voltage stress. On the other hand, in order to increase the voltage level, an extra capacitor is inserted into the direct current link, each phase can output four voltage levels, and the four-level converter can improve the voltage level, so that the output current waveform is more similar to a sine wave, the harmonic content is less, and the output capacity is large.
In the utility model, the high-voltage flying capacitor near the direct-current link is replaced by two clamping switches by modifying on the basis of the four-level flying capacitor topology, so that the size and the weight can be reduced. Built-in switch redundancy allows additional degrees of freedom to achieve capacitor voltage balancing and output current regulation.
The present utility model is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present utility model are intended to be included in the scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.
Claims (7)
1. A five-phase four-level hybrid clamp converter is characterized in that,
comprises five parallel single-phase four-level hybrid clamping converters, a first capacitor, a second capacitor and a third capacitor, wherein,
each single-phase four-level hybrid clamp converter comprises four power terminals and an output terminal, wherein the first power terminal is connected with a first pole of a first capacitor, the second power terminal is connected with a second pole of the first capacitor and a first pole of a second capacitor, the third power terminal is connected with a second pole of the second capacitor and a first pole of a third capacitor, the fourth power terminal is connected with a second pole of the third capacitor, and the first capacitor, the second capacitor and the third capacitor are connected in series.
2. A five-phase four-level hybrid clamp converter as defined in claim 1, wherein,
the first power terminal is also connected to the positive pole of the power supply.
3. A five-phase four-level hybrid clamp converter as defined in claim 1, wherein,
the fourth power terminal is also connected with the negative electrode of the power supply.
4. A five-phase four-level hybrid clamp converter as defined in claim 1, wherein,
the output terminals of each single-phase four-level hybrid clamping converter are connected with five phase ends of the five-phase permanent magnet synchronous motor in a one-to-one correspondence manner.
5. A five-phase four-level hybrid clamp converter as defined in claim 1, wherein,
each of the single-phase four-level hybrid clamp converters includes eight switching devices including a main switch S 1 ,S 3 ,S 4 ,Clamp switch->And S is 2 And a clamp capacitor.
6. A five-phase four-level hybrid clamp converter as defined in claim 5, wherein,
switching device S 1 Emitter-connected switching device of (a)And at the collector of the switching device S 1 And a switching device->Between which the switching device S is connected 3 Collector of (a), switching device S 3 Emitter-connected switching device S 4 A collector electrode of (a); switching device S 2 Emitter-connected switching device->And at the collector of the switching device S 2 And a switching device->A switching device is connected between->Emitter of (2), switching device->Collector-connected switching device->An emitter of (a); in the switching device S 3 、S 4 Is a common terminal and switching device->The clamping capacitor C4 and the switching device S are connected in parallel between the common terminals of the two 4 Emitter and switching device->After the collector electrode of the capacitor is connected, an output terminal is led out.
7. A five-phase four-level hybrid clamp converter as defined in claim 5 or 6, wherein,
in the switching device S 1 、S 2 The collector of the first and third power terminals are led out respectively, and the switching deviceThe emitters of which are respectively led out of the second power terminal and the fourth power terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202320163946.4U CN219372306U (en) | 2023-02-09 | 2023-02-09 | Five-phase four-level hybrid clamping converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320163946.4U CN219372306U (en) | 2023-02-09 | 2023-02-09 | Five-phase four-level hybrid clamping converter |
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| Publication Number | Publication Date |
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| CN219372306U true CN219372306U (en) | 2023-07-18 |
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| CN202320163946.4U Active CN219372306U (en) | 2023-02-09 | 2023-02-09 | Five-phase four-level hybrid clamping converter |
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- 2023-02-09 CN CN202320163946.4U patent/CN219372306U/en active Active
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