阅读说明：本技术 一种级联的高压变频器 (Cascaded high-voltage frequency converter ) 是由 仲华 于 2019-11-07 设计创作，主要内容包括：本发明涉及变频器技术领域,尤其涉及一种级联的高压变频器,包括变压器、连接结构、控制组件以及功率模块,其中,功率模块包括：一第一相输出单元,包括至少两个第一功率子单元,分布于功率模块的第一层和第二层；一第二相输出单元,包括至少两个第二功率子单元,分布于功率模块的第二层和第三层；一第三相输出单元,包括至少两个第三功率子单元,分布于功率模块的第三层和第四层；每一相输出单元中的连接至负载的功率子单元位于同一侧端。本发明的技术方案的有益效果在于：便于功率模块中各个功率子单元之间连接,保证高压变频器的输出端方便地与负载连接,使其内部布线方便,且满足不同用户的个性化需求,从而提升用户的使用满意度。(The invention relates to the technical field of frequency converters, in particular to a cascaded high-voltage frequency converter, which comprises a transformer, a connection structure, a control assembly and a power module, wherein the power module comprises: the first phase output unit comprises at least two first power subunits which are distributed on a first layer and a second layer of the power module; the second phase output unit comprises at least two second power subunits which are distributed on a second layer and a third layer of the power module; the third phase output unit comprises at least two third power subunits which are distributed on a third layer and a fourth layer of the power module; the power sub-units connected to the load in each phase output unit are located at the same side end. The technical scheme of the invention has the beneficial effects that: the power modules are connected with each other conveniently, the output end of the high-voltage frequency converter is connected with the load conveniently, the internal wiring of the high-voltage frequency converter is convenient, the individual requirements of different users are met, and therefore the using satisfaction of the users is improved.)

1. The utility model provides a cascaded high-voltage inverter, includes a transformer, install in the rear end of high-voltage inverter, one install in the connection structure of transformer first side, install in the control assembly of connection structure first side and install in the power module of transformer second side for export a working voltage, its characterized in that, power module includes:

the first phase output unit comprises at least two first power subunits which are distributed on a first layer and a second layer of the power module;

the second phase output unit comprises at least two second power subunits which are distributed on a second layer and a third layer of the power module;

the third phase output unit comprises at least two third power subunits which are distributed on a third layer and a fourth layer of the power module;

the first phase output unit is connected to the first power subunit of a load, and the second phase output unit and the third phase output unit are connected to the second power subunit of the load and are located at the same side end.

2. The cascaded high-voltage frequency converter as claimed in claim 1, wherein the first phase output unit, the second phase output unit and the third phase output unit are arranged in the power module in any transformation manner.

3. The cascaded high-voltage inverter of claim 1, wherein the first phase output unit comprises eight stages of the first power sub-units, and a first stage of the first power sub-units to a sixth stage of the first power sub-units are arranged in the first layer in a serial order, and a seventh stage of the first power sub-units to an eighth stage of the first power sub-units are arranged in the second layer in a serial order;

the second phase output unit comprises eight stages of the second power subunits, the second power subunits of the first stage to the fourth stage are arranged on the second layer in series sequence, and the second power subunits of the fifth stage to the eighth stage are arranged on the third layer in series sequence;

the third phase output unit comprises eight stages of the third power sub-unit, the third power sub-unit to the sixth stage of the first stage are arranged on the fourth layer in series sequence, and the third power sub-unit to the eighth stage of the seventh stage are arranged on the third layer in series sequence.

4. The cascaded high-voltage inverter of claim 3, wherein the first power sub-unit of the first stage of the first phase output unit, the second power sub-unit of the first stage of the second phase output unit, and the third power sub-unit of the first stage of the third phase output unit are disposed at a same side end.

5. A cascaded high-voltage inverter as claimed in claim 3, wherein the first power sub-unit of the sixth stage of the first phase output unit is vertically aligned with the first power sub-unit of the eighth stage of the first phase output unit, the second power sub-unit of the fourth stage of the second phase output unit is vertically aligned with the second power sub-unit of the eighth stage of the second phase output unit, and the third power sub-unit of the sixth stage of the third phase output unit is vertically aligned with the third power sub-unit of the eighth stage of the third phase output unit.

6. The cascaded high-voltage inverter of claim 1, wherein the first phase output unit comprises eight stages of the first power sub-units, and a first stage of the first power sub-units to a sixth stage of the first power sub-units are arranged in the first layer in a serial order, and a seventh stage of the first power sub-units to an eighth stage of the first power sub-units are arranged in the second layer in a serial reverse order;

the second phase output unit comprises eight stages of the second power subunits, the second power subunits of the first stage to the fourth stage are arranged on the second layer in series sequence, and the second power subunits of the fifth stage to the eighth stage are arranged on the third layer in reverse series sequence;

the third phase output unit comprises eight stages of the third power sub-unit, the third power sub-unit to the sixth stage of the first stage are arranged on the fourth layer according to the series sequence, and the third power sub-unit to the eighth stage of the seventh stage are arranged on the third layer according to the series reverse sequence.

7. The cascaded high-voltage inverter of claim 6, wherein the first power sub-unit of the sixth stage of the first phase output unit is vertically aligned with the first power sub-unit of the seventh stage of the first phase output unit, the second power sub-unit of the fourth stage of the second phase output unit is vertically aligned with the second power sub-unit of the fifth stage of the second phase output unit, and the third power sub-unit of the sixth stage of the third phase output unit is vertically aligned with the third power sub-unit of the seventh stage of the third phase output unit.

8. The cascaded high-voltage frequency converter according to claim 1, wherein the first phase output unit comprises eight stages of the first power sub-units, and a third stage of the first power sub-units to an eighth stage of the first power sub-units are arranged in a series reverse order in the first layer, and a first stage of the first power sub-units to a second stage of the first power sub-units are arranged in a series order in the second layer;

the second phase output unit comprises eight stages of the second power subunits, the second power subunits of the first stage to the fourth stage are arranged on the second layer in a series reverse order, and the second power subunits of the fifth stage to the eighth stage are arranged on the third layer in a series reverse order;

the third phase output unit comprises eight stages of the third power sub-unit, the third stage of the third power sub-unit to the eighth stage of the third power sub-unit are arranged on the fourth layer in a series reverse order, and the first stage of the third power sub-unit to the second stage of the third power sub-unit are arranged on the third layer in a series order.

9. The cascaded high-voltage inverter of claim 8, wherein the first power sub-unit of the eighth stage of the first phase output unit, the second power sub-unit of the eighth stage of the second phase output unit, and the third power sub-unit of the eighth stage of the third phase output unit are disposed at a same side end.

10. The cascaded high-voltage inverter of claim 1, further comprising at least one fan, wherein the fan is disposed at an upper end of the power module and/or an upper end of the control module and/or an upper end of the transformer and/or an upper end of the connection structure, and is configured to dissipate heat of the power module, the control module, the transformer and the connection structure.

Technical Field

The invention relates to the technical field of frequency converters, in particular to a cascaded high-voltage frequency converter.

Background

The high-voltage frequency converter is an electric energy control device which converts a power frequency power supply into another frequency by utilizing the on-off action of a power semiconductor device. With the rapid development of power electronic technology, high-voltage frequency converters are widely applied in the fields of power, metallurgy, petroleum, chemical industry and the like, and in the prior art, 2-level current source type high-voltage frequency converters, 3-level voltage source type frequency converters and power unit cascade multilevel high-voltage frequency converters are mainly used. The high-voltage frequency converter mainly comprises a transformer part and a power unit part, wherein the high-voltage frequency converter is formed by cascading power units with different quantities according to different grades of output voltage, the higher the output voltage is, the more the quantity of the power units is, and the volume of the high-voltage frequency converter is increased along with the increase of the quantity of the power units.

The high-voltage variable-frequency speed regulation device formed by the power unit cascade technology has the advantages of small harmonic wave, unit interchangeability, batch production, convenience in maintenance and the like, is accepted by the market, and has a good development prospect. At present, a 2-level H-bridge power unit cascade mode is generally adopted in a unit cascade high-voltage variable-frequency speed regulation device which is widely used, and the 2-level H-bridge power unit cascade high-voltage variable-frequency speed regulation device generally has more power units. As is well known, the reliability of the variable frequency speed control device is greatly reduced as the number of power units increases, and the volume of the variable frequency speed control device is larger due to more power units. Therefore, the above problems are difficult problems to be solved by those skilled in the art.

Disclosure of Invention

In view of the above problems in the prior art, a cascaded high-voltage inverter is provided. The specific technical scheme is as follows:

the invention provides a cascaded high-voltage frequency converter, which comprises a transformer, a connecting structure, a control assembly and a power module, wherein the transformer is arranged at the rear end of the high-voltage frequency converter, the connecting structure is arranged at the first side of the transformer, the control assembly is arranged at the first side of the connecting structure, the power module is arranged at the second side of the transformer and is used for outputting a working voltage, and the power module comprises:

the first phase output unit comprises at least two first power subunits which are distributed on a first layer and a second layer of the power module;

the second phase output unit comprises at least two second power subunits which are distributed on a second layer and a third layer of the power module;

the third phase output unit comprises at least two third power subunits which are distributed on a third layer and a fourth layer of the power module;

the first phase output unit is connected to the first power subunit of a load, and the second phase output unit and the third phase output unit are connected to the second power subunit of the load and are located at the same side end.

Preferably, the first phase output unit, the second phase output unit, and the third phase output unit may be arranged in the power module in an arbitrary manner.

Preferably, the first phase output unit includes eight stages of the first power sub-units, and first to sixth stages of the first power sub-units are arranged in the first layer in series order, and seventh to eighth stages of the first power sub-units are arranged in the second layer in series order;

the second phase output unit comprises eight stages of the second power subunits, the second power subunits of the first stage to the fourth stage are arranged on the second layer in series sequence, and the second power subunits of the fifth stage to the eighth stage are arranged on the third layer in series sequence;

the third phase output unit comprises eight stages of the third power sub-unit, the third power sub-unit to the sixth stage of the first stage are arranged on the fourth layer in series sequence, and the third power sub-unit to the eighth stage of the seventh stage are arranged on the third layer in series sequence.

Preferably, the first power subunit of the first stage of the first phase output unit, the second power subunit of the first stage of the second phase output unit, and the third power subunit of the first stage of the third phase output unit are arranged at the same side end.

Preferably, the first power subunit of the sixth stage of the first phase output unit is vertically aligned with the first power subunit of the eighth stage of the first phase output unit, the second power subunit of the fourth stage of the second phase output unit is vertically aligned with the second power subunit of the eighth stage of the second phase output unit, and the third power subunit of the sixth stage of the third phase output unit is vertically aligned with the third power subunit of the eighth stage of the third phase output unit.

Preferably, the first phase output unit includes eight stages of the first power sub-units, and the first power sub-units of the first stage to the sixth stage are arranged in the first layer in series order, and the first power sub-units of the seventh stage to the eighth stage are arranged in the second layer in series reverse order;

the second phase output unit comprises eight stages of the second power subunits, the second power subunits of the first stage to the fourth stage are arranged on the second layer in series sequence, and the second power subunits of the fifth stage to the eighth stage are arranged on the third layer in reverse series sequence;

the third phase output unit comprises eight stages of the third power sub-unit, the third power sub-unit to the sixth stage of the first stage are arranged on the fourth layer according to the series sequence, and the third power sub-unit to the eighth stage of the seventh stage are arranged on the third layer according to the series reverse sequence.

Preferably, the first power subunit of the sixth stage of the first phase output unit is vertically aligned with the first power subunit of the seventh stage of the first phase output unit, the second power subunit of the fourth stage of the second phase output unit is vertically aligned with the second power subunit of the fifth stage of the second phase output unit, and the third power subunit of the sixth stage of the third phase output unit is vertically aligned with the third power subunit of the seventh stage of the third phase output unit.

Preferably, the first phase output unit comprises eight stages of the first power sub-units, and the first power sub-units of the third stage to the eighth stage are arranged in the first layer in a series reverse order, and the first power sub-units of the first stage to the second stage are arranged in the second layer in a series order;

the second phase output unit comprises eight stages of the second power subunits, the second power subunits of the first stage to the fourth stage are arranged on the second layer in a series reverse order, and the second power subunits of the fifth stage to the eighth stage are arranged on the third layer in a series reverse order;

the third phase output unit comprises eight stages of the third power sub-unit, the third stage of the third power sub-unit to the eighth stage of the third power sub-unit are arranged on the fourth layer in a series reverse order, and the first stage of the third power sub-unit to the second stage of the third power sub-unit are arranged on the third layer in a series order.

Preferably, the first power sub-unit of the eighth stage of the first phase output unit, the second power sub-unit of the eighth stage of the second phase output unit, and the third power sub-unit of the eighth stage of the third phase output unit are arranged at the same side end.

Preferably, the power module further comprises at least one fan, and the fan is arranged at the upper end of the power module and/or the upper end of the control assembly and/or the upper end of the transformer and/or the upper end of the connecting structure and is used for dissipating heat of the power module, the control assembly, the transformer and the connecting structure.

The technical scheme of the invention has the beneficial effects that: the utility model provides a cascaded high-voltage inverter, be convenient for connect between a plurality of first power subelements among the power module, a plurality of second power subelements and a plurality of third power subelements, the output of having guaranteed high-voltage inverter can conveniently be connected with the load, it is more convenient to make its inside wiring, be applicable to different users ' demand, the suitability of this high-voltage inverter has been promoted, and satisfy different users ' individualized demand, thereby can promote user's use satisfaction.

Drawings

Embodiments of the present invention will now be described more fully hereinafter with reference to the accompanying drawings. The drawings are, however, to be regarded as illustrative and explanatory only and are not restrictive of the scope of the invention.

Fig. 1 is a top view of a high voltage inverter according to an embodiment of the present invention;

fig. 2 is a front view of a high voltage inverter according to an embodiment of the present invention;

FIG. 3 is a front view of a power module of an embodiment of the present invention;

FIG. 4 is a front view of a second power module of an embodiment of the present invention;

FIG. 5 is a front view of a third power module of an embodiment of the present invention;

fig. 6 is a front view of another high-voltage inverter according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.

The invention provides a cascaded high-voltage frequency converter, which comprises a transformer 1, a connecting structure 2 arranged at the first side of the transformer 1, a control component 3 arranged at the first side of the connecting structure 2 and a power module 4 arranged at the second side of the transformer 1, wherein the power module 4 is used for outputting a working voltage and comprises:

a first phase output unit 40, wherein the first phase output unit 40 includes at least two first power sub-units 400 distributed on the first layer and the second layer of the power module 4;

a second phase output unit 41, where the second phase output unit 41 includes at least two second power sub-units 410 distributed on the second layer and the third layer of the power module 4;

a third phase output unit 42, where the third phase output unit 42 includes at least two third power sub-units 420 distributed on the third layer and the fourth layer of the power module 4;

the first phase output unit 40 is connected to the first power subunit 400 of a load (not shown), and the second phase output unit 41 is connected to the second power subunit 410 of the load (not shown), and the third phase output unit 42 is connected to the third power subunit 420 of the load (not shown) at the same side.

Through the high-voltage frequency converter provided by the above, as shown in fig. 1 and 2, the high-voltage frequency converter comprises a transformer 1, a connection structure 2, a control assembly 3 and a power module 4, wherein the power module 4 is divided into an upper layer and a lower layer which are arranged, and comprises a first phase output unit 40, a second phase output unit 41 and a third phase output unit 42, the first phase output unit 40 corresponds to at least two first power sub-units 400 which are connected in series, the second phase output unit 41 corresponds to at least two second power sub-units 410 which are connected in series, and the third phase output unit 42 corresponds to at least two third power sub-units 420 which are connected in series, so that the connection between each two power sub-units is more convenient.

Further, the first power sub-units 400 are sequentially distributed on the first layer and the second layer of the power module 4, the second power sub-units 410 are sequentially distributed on the second layer and the third layer of the power module 4, and the third power sub-units 420 are sequentially distributed on the third layer and the fourth layer of the power module 4, so that the power sub-units connected with the neutral point in the first phase output unit 40, the second phase output unit 41, and the third phase output unit 42 are aligned up and down, so as to facilitate connection of the neutral point, and the power sub-units connected to the load (not shown in the figure) in each phase output unit are located at the same side end, so as to facilitate connection of the load (not shown in the figure), and make internal wiring thereof more convenient.

In a preferred embodiment, the first phase output unit 40, the second phase output unit 41 and the third phase output unit 42 may be arranged in the power module 4 in any manner.

Specifically, as shown in the following table 1, the first phase output unit 40, the second phase output unit 41, and the third phase output unit 42 may be respectively transformed in any form and arranged in the power module 4, that is, the first phase output unit 40 is a phase, the second phase output unit 41 is a phase B, and the third phase output unit 42 is a phase C; the first phase output unit 40 is a phase a, the second phase output unit 41 is a phase C, and the third phase output unit 42 is a phase B; the first phase output unit 40 is a phase B, the second phase output unit 41 is a phase a, and the third phase output unit 42 is a phase C; the first phase output unit 40 is a phase B, the second phase output unit 41 is a phase C, and the third phase output unit 42 is a phase a; the first phase output unit 40 is a phase C, the second phase output unit 41 is a phase a, and the third phase output unit 42 is a phase B; the first phase output unit 40 is a C-phase, the second phase output unit 41 is a B-phase, and the third phase output unit 42 is an a-phase.

TABLE 1

In this embodiment, the first phase output unit 40, the second phase output unit 41, and the third phase output unit 42 may be arbitrarily changed according to the corresponding relationship between the requirement in the actual service implementation process and the a phase, the B phase, and the C phase, and only the three phase output units are required to be respectively corresponding to the a phase, the B phase, and the C phase, so as to be applicable to the requirements of different users, and improve the applicability of the high voltage inverter in this embodiment.

In a preferred embodiment, the first phase output unit 40 includes eight stages of the first power sub-unit 400, and the first to sixth stages of the first power sub-units 400 to 400 are arranged in the first layer in series order, and the seventh to eighth stages of the first power sub-units 400 to 400 are arranged in the second layer in series order;

the second phase output unit 41 includes eight stages of second power subunits 410, and the first stage second power subunit 410 to the fourth stage second power subunit 410 are arranged in the second layer in series order, and the fifth stage second power subunit 410 to the eighth stage second power subunit 410 are arranged in the third layer in series order;

the third phase output unit 42 includes eight stages of third power sub-units 420, and the first-stage third power sub-units 420 to the sixth-stage third power sub-units 420 are arranged in the fourth layer in series order, and the seventh-stage third power sub-units 420 to the eighth-stage third power sub-units 420 are arranged in the third layer in series order.

The first-stage first power sub-unit 400 of the first phase output unit 40, the first-stage second power sub-unit 410 of the second phase output unit 41, and the first-stage third power sub-unit 420 of the third phase output unit 42 are arranged at the same side end.

The sixth stage first power sub-unit 400 of the first phase output unit 40 is vertically aligned with the eighth stage first power sub-unit 400 of the first phase output unit, the fourth stage second power sub-unit 410 of the second phase output unit 41 is vertically aligned with the eighth stage second power sub-unit 410 of the second phase output unit 41, and the sixth stage third power sub-unit 420 of the third phase output unit 42 is vertically aligned with the eighth stage third power sub-unit 420 of the third phase output unit 42.

Specifically, as shown in fig. 3, in the present embodiment, the first phase output unit 40 is an a phase, the second output unit 41 is a B phase, and the third output unit 42 is a C phase, wherein the first phase output unit 40 includes eight stages of first power sub-units 400, and the first stage first power sub-units 400 to the sixth stage first power sub-units 400 are arranged in the first layer in series order, and the seventh stage first power sub-units 400 to the eighth stage first power sub-units 400 are arranged in the second layer in series order, that is, the a1 to a6 are arranged in the first layer in series order, and the a7 to A8 are arranged in the second layer in series order; the second phase output unit 41 includes eight stages of second power sub-units 410, and the first-stage second power sub-units 410 to the fourth-stage second power sub-units 410 are arranged in the second layer in series order, the fifth-stage second power sub-units 410 to the eighth-stage second power sub-units 410 are arranged in the third layer in series order, that is, B1 to B4 are arranged in the second layer in series order, and B5 to B8 are arranged in the third layer in series order; the third phase output unit 42 includes eight stages of third power sub-units 420, and the first to sixth stages of third power sub-units 420 to 420 are arranged in series in the fourth layer, and the seventh to eighth stages of third power sub-units 420 to 420 are arranged in series in the third layer, i.e., C1 to C6 are arranged in series in the fourth layer, and C7 to C8 are arranged in series in the third layer, and the first phase output unit 40, the second phase output unit 41, and the third phase output unit 42 are respectively arranged in series not more than 1-4 layers of the power module 4, so as to ensure that the connection among the respective first power sub-units 400 corresponding to the first phase output unit 40, among the respective second power sub-units 410 corresponding to the second phase output unit 41, and among the respective third power sub-units corresponding to the third phase output unit 42 can be facilitated, and the connection sequence of the power subunits in each phase of output unit is unified, so that the occurrence probability of connection error events of the power subunits can be reduced, and the high-voltage frequency converter can be maintained more conveniently.

Further, the first-stage first power subunit 400 of the first phase output unit 40, the first-stage second power subunit 410 of the second phase output unit 41 and the first-stage third power subunit 420 of the third phase output unit 42 are arranged at the same side end, gaps are reserved among all the power subunits, and the first power subunit a1, the second power subunit B1 and the third power subunit C1 corresponding to a neutral point are arranged at the same side, so that connection of the intermediate point is more convenient.

In this embodiment, the first power subunit A8 phase, the second power subunit B8 phase and the third power subunit C8 phase are all disposed at the rightmost side of each phase of output unit, so that the output terminal of the high-voltage inverter can be conveniently connected to an external load (not shown in the figure).

Further, the sixth stage first power subunit 400 of the first phase output unit 40 is aligned with the eighth stage first power subunit 400 of the first phase output unit up and down, the fourth stage second power subunit 410 of the second phase output unit 41 is aligned with the eighth stage second power subunit 410 of the second phase output unit 41 up and down, and the sixth stage third power subunit 420 of the third phase output unit 42 is aligned with the eighth stage third power subunit 420 of the third phase output unit 42 up and down.

In a preferred embodiment, the first phase output unit 40 includes eight stages of the first power sub-unit 400, and the first to sixth stages of the first power sub-units 400 to 400 are arranged in the first layer in a serial order, and the seventh to eighth stages of the first power sub-units 400 to 400 are arranged in the second layer in a reverse serial order;

the second phase output unit 41 includes eight stages of second power subunits 410, and the first stage second power subunits 410 to the fourth stage second power subunits 410 are arranged in the second layer in series order, and the fifth stage second power subunits 410 to the eighth stage second power subunits 410 are arranged in the third layer in reverse order;

the third phase output unit 42 includes eight stages of third power sub-units 420, and the first-stage third power sub-units 420 to the sixth-stage third power sub-units 420 are arranged in the fourth layer in series order, and the seventh-stage third power sub-units 420 to the eighth-stage third power sub-units 420 are arranged in the third layer in reverse order of series.

The sixth-stage first power subunit 400 of the first phase output unit 40 is vertically aligned with the seventh-stage first power subunit 400 of the first phase output unit 40, the fourth-stage second power subunit 410 of the second phase output unit 41 is vertically aligned with the fifth-stage second power subunit 410 of the second phase output unit 41, and the sixth-stage third power subunit 420 of the third phase output unit 42 is vertically aligned with the seventh-stage third power subunit 420 of the third phase output unit.

Specifically, as shown in fig. 4, the first phase output unit 40 includes eight stages of first power sub-units 400, and the first to sixth stages of first power sub-units 400 to 400 are arranged in the first layer in series order, the seventh to eighth stages of first power sub-units 400 to 400 are arranged in the second layer in reverse order, that is, a1 to a6 are arranged in the first layer in series order, and a7 to A8 are arranged in the second layer in reverse order; the second phase output unit 41 comprises eight stages of second power subunits 410, and the first-stage second power subunits 410 to the fourth-stage second power subunits 410 are arranged at the second layer in series order, the fifth-stage second power subunits 410 to the eighth-stage second power subunits 410 are arranged at the third layer in series reverse order, i.e. B1 to B4 are arranged at the second layer in series order, and B5 to B8 are arranged at the third layer in series reverse order; the third phase output unit 42 includes eight stages of third power sub-units 420, and the first-stage third power sub-units 420 to the sixth-stage third power sub-units 420 are arranged in the fourth layer in series order, the seventh-stage third power sub-units 420 to the eighth-stage third power sub-units 420 are arranged in the third layer in reverse order of series, i.e., C1 through C6 are arranged in series order at the fourth level, C7 through C8 are arranged in series order at the third level, so as to ensure that the connection among the first power sub-units 400 corresponding to the first phase output unit 40, the second power sub-units 410 corresponding to the second phase output unit 41 and the third power sub-units corresponding to the third phase output unit 42 can be facilitated, and the connection sequence of the power subunits in each phase of output unit is unified, so that the occurrence probability of connection error events of the power subunits can be reduced, and the high-voltage frequency converter can be maintained more conveniently.

Further, the phase of the first power subunit a1 corresponding to the first phase output unit 40 and the phase of the second power subunit B1 corresponding to the second phase output unit 41 and the phase of the third power subunit C1 corresponding to the third phase output unit 42 are at the same side end, and gaps are formed between all the power subunits, so that the connection of the intermediate points is more convenient.

Further, the sixth stage first power subunit 400 of the first phase output unit 40 is aligned up and down with the seventh stage first power subunit 400 of the first phase output unit 40, the fourth stage second power subunit 410 of the second phase output unit 41 is aligned up and down with the fifth stage second power subunit 410 of the second phase output unit 41, the sixth stage third power subunit 420 of the third phase output unit 42 is aligned up and down with the seventh stage third power subunit 420 of the third phase output unit, so that only a short wire is required to achieve the connection of the first power subunit a6 phase and the first power subunit a7 phase, the connection of the second power subunit B4 phase and the second power subunit B5 phase, and the connection of the third power subunit C6 phase and the third power subunit C7 phase.

In a preferred embodiment, the first phase output unit 40 includes eight stages of the first power sub-units 400, and the third to eighth stages of the first power sub-units 400 to 400 are arranged in the first layer in reverse order of series, and the first stage of the first power sub-units 400 to the second stage of the first power sub-units 400 are arranged in the second layer in series;

the second phase output unit 41 comprises eight stages of second power subunits 410, the first stage second power subunits 410 to the fourth stage second power subunits 410 are arranged on the second layer in a series reverse order, and the fifth stage second power subunits 410 to the eighth stage second power subunits 410 are arranged on the third layer in a series reverse order;

the third phase output unit 42 includes eight stages of third power sub-units 420, and the third stage third power sub-units 420 to the eighth stage third power sub-units 420 are arranged in the fourth layer in reverse order of series, and the first stage third power sub-units 420 to the second stage third power sub-units 420 are arranged in the third layer in series.

The eighth-stage first power sub-unit 400 of the first phase output unit 40, the eighth-stage second power sub-unit 410 of the second phase output unit 41, and the eighth-stage third power sub-unit 420 of the third phase output unit 42 are arranged at the same side end.

Specifically, as shown in fig. 5, the third-stage first power sub-unit 400 to the eighth-stage first power sub-unit 400 are arranged in the first layer in reverse order of series, the first-stage first power sub-unit 400 to the second-stage first power sub-unit 400 are arranged in the second layer in series, that is, A3 to A8 are arranged in the first layer in reverse order of series, and a1 to a2 are arranged in the second layer in series; the first-stage second power subunit 410 to the fourth-stage second power subunit 410 are arranged on the second layer in the reverse order of series, the fifth-stage second power subunit 410 to the eighth-stage second power subunit 410 are arranged on the third layer in the reverse order of series, namely, the B1 to B4 are arranged on the second layer in the reverse order of series, and the B5 to B8 are arranged on the third layer in the reverse order of series; the third-stage third power subunit 420 to the eighth-stage third power subunit 420 are arranged in the fourth layer in a reverse serial order, the first-stage third power subunit 420 to the second-stage third power subunit 420 are arranged in the third layer in a serial order, that is, the C3 to C8 phases are arranged in the fourth layer in a reverse serial order, and the C1 to C2 phases are arranged in the third layer in a serial order, so as to ensure that the connections between the first power subunits 400 corresponding to the first-phase output unit 40, the second power subunits 410 corresponding to the second-phase output unit 41, and the third power subunits corresponding to the third-phase output unit 42 can be conveniently connected, and the connection order of the power subunits in each-phase output unit can reduce the occurrence probability of the power subunit connection error event, and can more conveniently maintain the high-voltage frequency converter.

Further, the eighth stage first power sub-unit 400 of the first phase output unit 40, the eighth stage second power sub-unit 410 of the second phase output unit 41 and the eighth stage third power sub-unit 420 of the third phase output unit 42 are arranged at the same side end, and all the power sub-units have a gap therebetween, so that the connection of the middle point is more convenient and the connection to an external load (not shown) is facilitated.

Further, in the present embodiment, the first power subunit 400(A3 phase) and the first power subunit 400(a2 phase) corresponding to the first phase output unit 40 are arranged in the same position, and the third power subunit 420(C3 phase) and the third power subunit 420(C2 phase) corresponding to the third phase output unit 42 are arranged in the same position, so as to reduce the length of the connecting wires, while the concentrated arrangement of the first power subunit 400(a1 phase), the second power subunit 410(B1 phase) and the third power subunit 420(C1 phase) corresponding to the neutral point is more favorable for connection using shorter wires.

It should be noted that, in fig. 2-5, the connection line between each phase of power sub-units represents a cable or a conductor row path connected between the power sub-units, and in addition, the above-mentioned embodiments provided by the present invention may not be all the layout manners of the power module 4, for example, in other layout manners, the second power sub-units 410(B1 phase to B4 phase) corresponding to the second phase output unit 41 may be arranged in the third layer in the serial order, the second power units 410(B5 phase to B8 phase) corresponding to the second phase output unit may be arranged in the second layer in the serial order, or the first power sub-units 400(A3 phase to A8 phase) corresponding to the first phase output unit 40 may be arranged in the first layer in the serial order, and the first phase output units 400(a1 phase to a2 phase) may be arranged in the second layer in the serial order, of course, other layout manners, are not described in detail herein.

In a preferred embodiment, the power module further comprises at least one fan 5, and the fan 5 is disposed at an upper end of the power module 4 and/or an upper end of the control component 3 and/or an upper end of the transformer 1 and/or an upper end of the connection structure 2, and is configured to dissipate heat of the power module, the control component, the transformer and the connection structure.

In particular, as shown in fig. 6, the fan 5 may be placed above each power subunit, or above the transformer 1 on the rear side of the frequency converter and/or above the connection structure 2 and/or above the control assembly 3.

The fan 5 in this embodiment is used to dissipate heat of the transformer 1, each power subunit, the control assembly 3, and the connection structure 2 on the rear side of the frequency converter.

It should be noted that the high-voltage inverter of the present invention includes a cabinet (not shown in the figure), a layered partition (not shown in the figure) is disposed inside the cabinet, and the transformer 1, each power subunit, the control component 3, the connection structure 2, and each fan 5 on the rear side of the inverter are all mounted on the cabinet (not shown in the figure) of the high-voltage inverter.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.