CN220043236U - Multiphase cascade frequency converter - Google Patents
Multiphase cascade frequency converter Download PDFInfo
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- CN220043236U CN220043236U CN202320807603.7U CN202320807603U CN220043236U CN 220043236 U CN220043236 U CN 220043236U CN 202320807603 U CN202320807603 U CN 202320807603U CN 220043236 U CN220043236 U CN 220043236U
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- frequency converter
- direct current
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- multiphase
- cascaded
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- 239000003990 capacitor Substances 0.000 claims abstract description 25
- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical group O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 claims description 10
- 238000012423 maintenance Methods 0.000 abstract description 4
- 230000017525 heat dissipation Effects 0.000 abstract description 2
- 230000016507 interphase Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 229910009445 Y1-Ym Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 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
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Abstract
The utility model discloses a multiphase cascade frequency converter, which comprises a plurality of three-phase cascade frequency converters; each phase of the three-phase cascade frequency converter comprises k cascade power units, and each stage of the three-phase cascade frequency converter is provided with a positive common direct current bus, a negative common direct current bus, a bus capacitor and a brake unit; the positive common direct current bus is connected with positive direct current buses of three power units of each stage of the three-phase cascade frequency converter, and the negative common direct current bus is connected with negative direct current buses of three power units of each stage of the three-phase cascade frequency converter; the bus capacitor and the braking unit are arranged between the positive common direct current bus and the negative common direct current bus. The utility model not only can solve the problems of volume, heat dissipation and the like of the power unit of the high-power multiphase cascade frequency converter, but also can improve the inter-phase equalization problem of system operation; the difficulties of module assembly, maintenance and the like are reduced.
Description
Technical Field
The utility model relates to the technical field of frequency converters, in particular to a multiphase cascade frequency converter.
Background
The ultra-large instantaneous power multiphase motor driving frequency converter mostly adopts cascade topology, a plurality of power units PN are connected in series, direct current buses of the power units are independent, and high voltage output is easy to achieve. Each power cell is configured with a supercapacitor, a reactor, a DCDC unit, a bus capacitor, a brake unit, and an H-bridge unit. However, the existing power unit assembly process is complex, the power modules are large in size, each power module is required to be independently provided with a brake unit and a bus capacitor module, and the difficulty in assembly and maintenance of the subsequent modules is high.
Disclosure of Invention
The utility model aims to provide a multi-phase cascade frequency converter so as to solve the problem of high difficulty in module assembly and maintenance of a high-power multi-phase cascade frequency converter.
The utility model provides a multiphase cascade frequency converter, which comprises a plurality of three-phase cascade frequency converters;
each phase of the three-phase cascaded frequency converter comprises k cascaded power cells,
each stage of the three-phase cascade frequency converter is provided with a positive common direct current bus, a negative common direct current bus, a bus capacitor and a brake unit;
the positive common direct current bus is connected with positive direct current buses of three power units of each stage of the three-phase cascade frequency converter, and the negative common direct current bus is connected with negative direct current buses of three power units of each stage of the three-phase cascade frequency converter;
the bus capacitor and the braking unit are arranged between the positive common direct current bus and the negative common direct current bus.
According to the multiphase cascade frequency converter, three power units of each stage in the three-phase cascade frequency converter are designed by adopting a common direct current bus, and each common bus loop is provided with a braking unit, so that the energy consumption in the braking process and the discharging function of the super capacitor module are provided; the problems of volume, heat dissipation and the like of a high-power multiphase cascade frequency converter power unit can be solved, and the inter-phase equalization problem of system operation can be improved; the difficulties of module assembly, maintenance and the like are reduced.
Drawings
Fig. 1 is a schematic diagram of a multiphase cascaded frequency converter according to an embodiment of the present utility model;
fig. 2 is a schematic diagram of a power unit in a multiphase cascaded frequency converter according to an embodiment of the present utility model;
fig. 3 is a schematic diagram of a braking unit in the multiphase cascaded frequency converter according to the embodiment of the present utility model.
The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear and obvious, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The embodiment of the utility model provides a multiphase cascade frequency converter, which comprises a plurality of three-phase cascade frequency converters;
each phase of the three-phase cascaded frequency converter comprises k cascaded power cells,
each stage of the three-phase cascade frequency converter is provided with a positive common direct current bus, a negative common direct current bus, a bus capacitor and a brake unit;
the positive common direct current bus is connected with positive direct current buses of three power units of each stage of the three-phase cascade frequency converter, and the negative common direct current bus is connected with negative direct current buses of three power units of each stage of the three-phase cascade frequency converter;
the bus capacitor and the braking unit are arranged between the positive common direct current bus and the negative common direct current bus.
In an example, in the plurality of three-phase cascaded frequency converters, the number of cascades of at least two three-phase cascaded frequency converters is different.
In an example, after k power units are cascaded, one end forms a common connection point, and the other end forms a phase connection end.
In an example, further comprising a mesh side switch and a machine side switch;
the three-phase connection end of the three-phase cascade frequency converter is connected with a power grid through the grid side switch and is connected with a motor through the machine side switch; the mesh side switch and the machine side switch are configured to not conduct simultaneously.
For example: the multiphase cascaded frequency converter in fig. 1 comprises two three-phase cascaded frequency converters. One of the three-phase cascade frequency converters comprises n cascade power units (power units U1-Un, V1-Vn and W1-Wn in the figure); the three-phase cascade frequency converter is provided with n groups of public direct current buses (shown as BUS1-BUSn in the figure); each group of common direct current buses is provided with a braking unit (shown as a braking unit 1-a braking unit n in the figure) and a bus capacitor (shown as a bus capacitor 1-a bus capacitor n in the figure) to provide the functions of braking process energy consumption and super capacitor module discharging.
Similarly, another three-phase cascade inverter, each phase includes m cascaded power units (power units X1-Xm, Y1-Ym, Z1-Zm in the figure); the three-phase cascade frequency converter is provided with m groups of common direct current buses (shown as BUS1-BUSm in the figure); each group of common direct current buses is provided with a braking unit (shown as a braking unit 1-a braking unit m in the figure) and a bus capacitor (shown as a bus capacitor 1-a bus capacitor m in the figure) to provide the functions of braking process energy consumption and super capacitor module discharging.
The two three-phase cascade frequency converters are connected with a power grid through grid side circuit breakers QF1 and QF2 respectively, and are connected with a motor through machine side circuit breakers QF3 and QF 4. When the frequency converter is charged, the grid-side circuit breakers QF1 and QF2 are closed, and the machine-side circuit breakers QF3 and QF4 are opened; the circuit breakers QF3 and QF4 at the output time of the frequency converter are closed, and the circuit breakers QF1 and QF2 at the network side are opened.
As shown in fig. 2, in an example, the power unit in the multiphase cascaded frequency converter includes a super capacitor C1, an inductor, a DCDC unit, and an H-bridge unit connected in sequence;
the inductor comprises a first inductor L1 and a second inductor L2, the super capacitor C1 is connected with one output end o1 of the DCDC unit through the first inductor L1, the super capacitor C1 is connected with the other output end o2 of the DCDC unit through the second inductor L2, and the DCDC unit is connected with the H bridge unit through positive and negative direct current buses. The DCDC unit and the H bridge unit comprise 4 full-control power devices, namely full-control power devices S1-S4 and S5-S8. The two connection terminals P, N of the H-bridge units are used to cascade with adjacent H-bridge units (the connection terminal P forms a connection terminal if the H-bridge unit is the first power unit, and the connection terminal N forms a common connection point if the H-bridge unit is the last power unit)
As shown in fig. 3, in an example, a braking unit in a multiphase cascaded frequency converter comprises a braking resistor R1 and a controllable switch K1 connected in series.
The preferred embodiments of the present utility model have been described above with reference to the accompanying drawings, and thus do not limit the scope of the claims of the present utility model. Any modifications, equivalent substitutions and improvements made by those skilled in the art without departing from the scope and spirit of the present utility model shall fall within the scope of the appended claims.
Claims (7)
1. The multi-phase cascade frequency converter is characterized by comprising a plurality of three-phase cascade frequency converters;
each phase of the three-phase cascaded frequency converter comprises k cascaded power cells,
each stage of the three-phase cascade frequency converter is provided with a positive common direct current bus, a negative common direct current bus, a bus capacitor and a brake unit;
the positive common direct current bus is connected with positive direct current buses of three power units of each stage of the three-phase cascade frequency converter, and the negative common direct current bus is connected with negative direct current buses of three power units of each stage of the three-phase cascade frequency converter;
the bus capacitor and the braking unit are arranged between the positive common direct current bus and the negative common direct current bus.
2. The multiphase cascaded frequency converter of claim 1 wherein k of the power cells are cascaded with one end forming a common connection point and the other end forming a phase connection.
3. The multiphase cascaded frequency converter of claim 2, further comprising a grid side switch and a machine side switch;
the three-phase connection end of the three-phase cascade frequency converter is connected with a power grid through the grid side switch and is connected with a motor through the machine side switch; the mesh side switch and the machine side switch are configured to not conduct simultaneously.
4. The multiphase cascaded frequency converter of claim 1 wherein the power cell comprises a super capacitor, an inductor, a DCDC cell and an H-bridge cell connected in sequence;
the inductor comprises a first inductor and a second inductor, the super capacitor is connected with one output end of the DCDC unit through the first inductor, the super capacitor is connected with the other output end of the DCDC unit through the second inductor, and the DCDC unit is connected with the H bridge unit through positive and negative direct current buses.
5. The multiphase cascaded frequency converter of claim 4, wherein the DCDC unit and the H-bridge unit each comprise 4 fully controlled power devices.
6. The multiphase cascaded frequency converter of claim 1, wherein the braking unit comprises a braking resistor and a controllable switch connected in series.
7. The multiphase cascaded frequency converter of claim 1, wherein the number of cascades of at least two of the three-phase cascaded frequency converters is different among the plurality of three-phase cascaded frequency converters.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223613484 | 2022-12-30 | ||
| CN2022236134846 | 2022-12-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220043236U true CN220043236U (en) | 2023-11-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320807603.7U Active CN220043236U (en) | 2022-12-30 | 2023-04-09 | Multiphase cascade frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220043236U (en) |
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2023
- 2023-04-09 CN CN202320807603.7U patent/CN220043236U/en active Active
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