CN209526664U - The submodule unit and modularization multi-level converter of modularization multi-level converter - Google Patents
The submodule unit and modularization multi-level converter of modularization multi-level converter Download PDFInfo
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- CN209526664U CN209526664U CN201821621457.4U CN201821621457U CN209526664U CN 209526664 U CN209526664 U CN 209526664U CN 201821621457 U CN201821621457 U CN 201821621457U CN 209526664 U CN209526664 U CN 209526664U
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Abstract
The utility model embodiment discloses the submodule unit and and modularization multi-level converter of modularization multi-level converter.Include: one or more of first submodule, there is the first output voltage；One or more of second submodule has the second output voltage；Wherein first submodule is connected with the second submodule, and the second submodule and the first submodule circuit topological structure having the same, second output voltage is N times of first output voltage, and wherein N is the positive integer for being at least 2.Modularization multi-level converter output voltage is more flexible, and can reduce the quantity of submodule.
Description
Technical field
This application involves the fields modularization multi-level converter (Modular Multilevel Converter, MMC), especially
Its submodule unit for being related to MMC and MMC.
Background technique
MMC is a kind of novel voltage conversion circuit, it by by multiple submodule (submodule) cascade mode,
It can be superimposed the very high voltage of output, and also have the characteristics that output harmonic wave is few, the degree of modularity is high, thus in electric system
In be with a wide range of applications.
Common submodule topology includes semi-bridge type submodule, bridge-type submodule and double Clamp submodules at present, etc.
Deng.
In the prior art, all submodules of MMC all have an identical and lower output voltage.
However, all the identical output voltage configuration for leading to MMC is not flexible for submodule output voltage.Moreover, submodule
Compared with the submodule quantity that low output voltage will increase identical DC link voltage, the quantity of the submodule in MMC is caused to increase.
Utility model content
In view of this, the main purpose of the utility model embodiment is to provide the submodule unit of MMC and MMC.
The technical solution of the utility model embodiment is achieved in that
The submodule unit of MMC, comprising:
One or more of first submodule has the first output voltage；
One or more of second submodule has the second output voltage；
Wherein first submodule is connected with the second submodule, the second submodule and first submodule
Circuit topological structure having the same, second output voltage are N times of first output voltage, and wherein N is to be at least 2
Positive integer.
As it can be seen that the submodule unit of the utility model includes the submodule there are two types of different output voltages.Compared to more existing
The output voltage of technology, submodule unit is more flexible.Moreover, the second output voltage is N times of the first output voltage, therefore
It is expected that when MMC output phase is with voltage, the quantity of submodule is can be significantly reduced in the utility model prior art that compares.
In one embodiment, further includes:
One or more of third submodule, with third output voltage；
Wherein the third submodule is connected with first submodule and the second submodule, the third submodule
With the first submodule circuit topological structure having the same, the third output voltage is the M of first output voltage
Times, wherein M is to be at least 2 positive integer, and M is not equal to N.
As it can be seen that the submodule of the submodule unit of the utility model different output voltages comprising there are three types of, therefore submodule
The output voltage of unit is more flexible.Moreover, when desired MMC output phase is with voltage, the utility model compares the prior art
The quantity of submodule can be significantly reduced.
In one embodiment, further includes:
One or more of 4th submodule has the 4th output voltage；
Wherein the 4th submodule and first submodule, the second submodule and the third submodule string
Connection, the 4th submodule and the first submodule circuit topological structure having the same, the 4th output voltage is institute
K times for stating the first output voltage, wherein K is the positive integer for being at least 2, and K is not equal to M, and K is not equal to N.
As it can be seen that the submodule of the submodule unit of the utility model different output voltages comprising there are four types of, therefore submodule
The output voltage of unit is more flexible.Moreover, when desired MMC output phase is with voltage, the utility model compares the prior art
The quantity of submodule can be significantly reduced.
In one embodiment, first submodule, the second submodule, the third submodule and described
The series connection of four submodule piecemeals or interleaved series.
Therefore, the submodule of the utility model has a variety of series systems.
In one embodiment, the circuit topological structure is semi-bridge type submodular circuits topological structure or bridge-type
Modular circuit topological structure.
MMC, comprising:
The submodule unit of one or more MMC according to any of the above item.
Therefore, the utility model also achieves a kind of MMC based on submodule unit.The output voltage of MMC is more flexible,
The quantity of submodule can also be significantly reduced.
Modularization multi-level converter, comprising:
A circuitry phase, connect with DC power supply；
B circuitry phase is connect with the DC power supply；
C circuitry phase is connect with the DC power supply；
Wherein the A circuitry phase, the B circuitry phase and the C circuitry phase the first circuit topological structure having the same；
First circuit topological structure includes: the first half-bridge circuit；Second half-bridge circuit；Current sharing inductor is connected on institute
It states between the first half-bridge circuit and second half-bridge circuit；Wherein first half-bridge circuit and second half-bridge circuit have
There is identical second circuit topological structure；
The second circuit topological structure includes: one or more of first submodule, has the first output voltage；One or
Multiple second submodules has the second output voltage；Wherein first submodule is connected with the second submodule, institute
Second submodule and first submodule tertiary circuit topological structure having the same are stated, second output voltage is described
N times of first output voltage, wherein N is the positive integer for being at least 2.
Therefore, the utility model also achieves a kind of comprising there are many MMC of the submodule of different output voltages.MMC's
Output voltage is more flexible, can also significantly reduce the quantity of submodule.
In one embodiment, the tertiary circuit topological structure is semi-bridge type submodular circuits topological structure or full-bridge
Type submodular circuits topological structure.
In one embodiment, the N is 2 or 3 or 4.
In one embodiment, the N is 2, and first output voltage is six points of the voltage of the DC power supply
One of.
Therefore, the utility model also achieves seven level MMC of one kind.
Detailed description of the invention
Fig. 1 is the first demonstrative structure figure according to the submodule unit of the MMC of the utility model embodiment.
Fig. 2 is the second demonstrative structure figure according to the submodule unit of the MMC of the utility model embodiment.
Fig. 3 is the third demonstrative structure figure according to the submodule unit of the MMC of the utility model embodiment.
Fig. 4 is according to the concatenated exemplary signal of the utility model embodiment submodule piecemeal in submodule unit
Figure.
Fig. 5 is the exemplary schematic representation according to the utility model embodiment interleaved series in submodule unit.
Fig. 6 is the structure chart of the MMC according to the utility model embodiment comprising submodule unit.
Fig. 7 is the demonstrative structure figure according to seven level MMC of the utility model embodiment.
Wherein, appended drawing reference is as follows:
| Label | Meaning |
| 10 | Submodule unit |
| 11 | First submodule |
| 12 | Second submodule |
| 13 | Third submodule |
| 14 | 4th submodule |
| 20 | MMC |
| 21 | Output voltage is the submodule of 1/6Udc |
| 22 | Output voltage is the submodule of 1/3Udc |
| 31 | A circuitry phase |
| 32 | B circuitry phase |
| 33 | C circuitry phase |
| 311 | First half-bridge circuit |
| 312 | Second half-bridge circuit |
| 313,314 | Current sharing inductor |
Specific embodiment
In order to which the technical solution of the utility model and advantage is more clearly understood, below in conjunction with drawings and the embodiments,
The present invention will be further described in detail.It should be appreciated that the specific embodiments described herein are only used to illustrate
Property illustrate the utility model, be not used to limit the protection scope of the utility model.
It is succinct and intuitive in order to what is described, hereafter by describing several representative embodiments come to the utility model
Scheme be illustrated.A large amount of details is only used for helping to understand the embodiment of the utility model in embodiment.However, it will be apparent that
The technical solution of the utility model can be not limited to these details when realizing.It is practical new in order to avoid unnecessarily having obscured this
The scheme of type, some embodiments are not described meticulously, but only give frame.Hereinafter, " comprising " refers to " packet
Include but be not limited to ", " according to ... " refer to " according at least to ..., but be not limited to according only to ... ".Since the language of Chinese is practised
It is used, when being hereinafter not specifically stated the quantity of an ingredient, it is meant that the ingredient is either one or more, or can
It is interpreted as at least one.
Applicant considers that the submodule of MMC in the prior art has the defect of identical output voltage values, proposes a kind of collection
At the submodule unit for the submodule for having different output voltages.The submodule unit flexible arrangement of the utility model can be arrived
In MMC, to constitute the MMC with different output voltages.
Fig. 1 is the first demonstrative structure figure according to the submodule unit of the MMC of the utility model embodiment.
As shown in Figure 1, submodule unit 10 includes:
First submodule 11 has the first output voltage；
Second submodule 12 has the second output voltage；
Wherein the first submodule 11 is connected with second submodule 12, and second submodule 12 has identical with the first submodule 11
Circuit topological structure, the second output voltage is N times of the first output voltage, wherein N be at least 2 positive integer.
For example, the circuit topological structure of second submodule 12 and the first submodule 11 is semi-bridge type submodular circuits topology knot
Structure or bridge-type submodular circuits topological structure, etc..
Wherein, the number of the first submodule 11 in submodule unit 10 can be one or more, in submodule unit 10
The number of second submodule 12 can be one or more.Moreover, the first submodule 11 and second submodule 12 are based on submodule
Type, piecemeal series connection or interleaved series in submodule unit 10.
Therefore, the submodule unit 10 in Fig. 1 includes the submodule there are two types of different output voltages.Compared to more existing skill
The output voltage of art, the submodule unit 10 in Fig. 1 is more flexible.Moreover, because the second output voltage of second submodule 12
It is N times of the first output voltage of the first submodule 11, therefore when desired MMC output phase is with voltage, the son being integrated in Fig. 1
The quantity of submodule can be significantly reduced in the MMC of modular unit 10, the prior art that compares.
Fig. 2 is the second demonstrative structure figure according to the submodule unit of the MMC of the utility model embodiment.
As shown in Fig. 2, submodule unit 10 includes:
First submodule 11 has the first output voltage；
Second submodule 12 has the second output voltage；
Third submodule 13, with third output voltage；
Wherein the first submodule 11 is connected with second submodule 12, and second submodule 12 has identical with the first submodule 11
Circuit topological structure, the second output voltage is N times of the first output voltage, wherein N be at least 2 positive integer；Third
Module 13 is connected with the first submodule 11 and second submodule 12, third submodule 13 and the electricity having the same of the first submodule 11
Road topological structure, third output voltage are M times of the first output voltage, and wherein M is to be at least 2 positive integer, and M is not equal to N.
For example, the circuit topological structure of the first submodule 11, second submodule 12 and third submodule 13 is semi-bridge type
Modular circuit topological structure or bridge-type submodular circuits topological structure, etc..
Wherein, the number of the first submodule 11 in the submodule unit 10 in Fig. 2 can be one or more, in Fig. 2
The number of second submodule 12 in submodule unit 10 can be one or more, the third in submodule unit 10 in Fig. 2
The number of submodule 13 can be one or more.
Moreover, the first submodule 11, second submodule 12 and third submodule 13 are based on sub-module types, in submodule list
Piecemeal series connection or interleaved series in member 10.
Therefore, the submodule unit 10 in Fig. 2 includes the submodule there are three types of different output voltages.Compared to more existing skill
The output voltage of art, the submodule unit 10 in Fig. 2 is more flexible.Moreover, because the second output voltage of second submodule 12
It is N times of the first output voltage of the first submodule 11, the third output voltage of third submodule 13 is the M of the first output voltage
Times, therefore when desired MMC output phase is with voltage, it is integrated with the MMC of the submodule unit 10 in Fig. 2, compare the prior art
The quantity of submodule can be significantly reduced.
Fig. 3 is the third demonstrative structure figure according to the submodule unit of the MMC of the utility model embodiment.
As shown in figure 3, submodule unit 10 includes:
First submodule 11 has the first output voltage；
Second submodule 12 has the second output voltage；
Third submodule 13, with third output voltage；
4th submodule 14 has the 4th output voltage；
Wherein the first submodule 11 is connected with second submodule 12, and second submodule 12 has identical with the first submodule 11
Circuit topological structure, the second output voltage is N times of the first output voltage, wherein N be at least 2 positive integer；Third
Module 13 is connected with the first submodule 11 and second submodule 12, third submodule 13 and the electricity having the same of the first submodule 11
Road topological structure, third output voltage are M times of the first output voltage, and wherein M is to be at least 2 positive integer, and M is not equal to N；
4th submodule 14 is connected with the first submodule 11, second submodule 12 and third submodule 13, the 4th submodule 14 and first
The circuit topological structure having the same of submodule 11, the 4th output voltage are K times of the first output voltage, and wherein K is to be at least 2
Positive integer, K be not equal to M, and K be not equal to N.
For example, the first submodule 11, second submodule 12, third submodule 13 and the 4th submodule 14 circuit topology knot
Structure is semi-bridge type submodular circuits topological structure or bridge-type submodular circuits topological structure, etc..
Wherein, the number of the first submodule 11 in the submodule unit 10 in Fig. 3 can be one or more, in Fig. 3
In submodule unit 10 number of second submodule 12 can be one or more, third submodule in the submodule unit 10 in Fig. 3
The number of block 13 can be one or more, the number of the 4th submodule 14 in submodule unit 10 in Fig. 3 can for one or
It is multiple.
Based on sub-module types, the first submodule 11, second submodule 12, third submodule 13 and the 4th submodule 14 can
With piecemeal series connection or interleaved series.
Therefore, the submodule unit 10 in Fig. 3 includes the submodule there are three types of different output voltages.Compared to more existing skill
The output voltage of art, the submodule unit 10 in Fig. 3 is more flexible.Moreover, because the second output voltage of second submodule 12
It is N times of the first output voltage of the first submodule 11, the third output voltage of third submodule 13 is the M of the first output voltage
Times, the 4th output voltage of the 4th submodule 14 is K times of the first output voltage, therefore when desired MMC output phase is with voltage,
It is integrated with the MMC of the submodule unit 10 in Fig. 3, the quantity of submodule can be significantly reduced in the prior art that compares.
In Fig. 1-Fig. 3, the submodule comprising 2 kinds, the 3 kinds and 4 kinds submodules with different output voltages is respectively illustrated
Module unit.It will be appreciated by those of skill in the art that can also be comprising more in the submodule unit of the utility model embodiment
A variety of submodules with different output voltages, the utility model embodiment is to this and is not limited.
In Fig. 1-Fig. 3, a variety of submodules with different output voltages are connected in submodule unit.
Fig. 4 is according to the concatenated exemplary signal of the utility model embodiment submodule piecemeal in submodule unit
Figure.
As shown in figure 4, in submodule unit 10 include two the first submodules 11 and two second submodules 12, wherein this
Two the first submodules 11 are adjacently positioned and connect, the two second submodules 12 are adjacently positioned and connect.That is, tool
There are two the first submodules 11 of identical sub-module types to be serially connected for a piecemeal, two with identical sub-module types
Second submodule 12 is serially connected as another piecemeal, is then serially connected again between the two piecemeals.
Fig. 5 is that the exemplary of interleaved series is illustrated in submodule unit according to the utility model embodiment submodule
Figure.
As shown in figure 5, including two the first submodules 11 and two second submodules 12 in submodule unit 10, wherein the
One submodule 11 and 12 interleaved series of second submodule.That is, first the first submodule 11 and first the second submodule
Block 12 is connected, and first second submodule 12 connect with second the first submodule 11, and second the first submodule 11 is again with the
Two second submodules 12 are connected.
The above demonstration describes exemplary series system of the submodule in submodule unit, and those skilled in the art can
, it is realized that the numerous embodiments such as random series connection, unequal interval series connection can also be used, the utility model embodiment is to this
And it is not limited.
Based on the submodule unit of the utility model embodiment, it can easily be combined into MMC.
Fig. 6 is the structure chart of the MMC according to the utility model embodiment comprising submodule unit.
As shown in fig. 6, MMC20 includes:
A circuitry phase 31 is connect with DC power supply Udc；
B circuitry phase 32 is connect with DC power supply Udc；
C circuitry phase 33 is connect with DC power supply Udc；
Wherein A circuitry phase 31, B circuitry phase 32 and first circuit topological structure having the same of C circuitry phase 33；First circuit
Topological structure includes: the first half-bridge circuit 311；Second half-bridge circuit 312；Two current sharing inductors 313,314 are connected on the first half
Between bridge circuit 311 and the second half-bridge circuit 312；Wherein the first half-bridge circuit 311 and the second half-bridge circuit 312 are having the same
Second circuit topological structure；Second circuit topological structure includes multiple submodule units 10 as described above.
In Fig. 6, increase the number of submodule unit 10 with can be convenient to promote the output voltage of MMC20, it can also be with
Reduce the number of submodule unit 10 easily to reduce the output voltage of MMC20.Moreover, by adjusting in submodule unit 10
Submodule number or submodule output voltage, the output voltage of MMC20 can also be adjusted flexibly.
Below by taking seven level MMC as an example, the specific implementation of the utility model is described.
Fig. 7 is the demonstrative structure figure according to seven level MMC of the utility model embodiment.
As shown in fig. 7, MMC20 includes:
A circuitry phase 31 is connect with DC power supply Udc；
B circuitry phase 32 is connect with DC power supply Udc；
C circuitry phase 33 is connect with DC power supply Udc；
Wherein A circuitry phase 31, B circuitry phase 32 and first circuit topological structure having the same of C circuitry phase 33；First circuit
Topological structure includes: the first half-bridge circuit 311；Second half-bridge circuit 312；Two current sharing inductors 313,314 are connected on the first half
Between bridge circuit 311 and the second half-bridge circuit 312；Wherein the first half-bridge circuit 311 and the second half-bridge circuit 312 are having the same
Second circuit topological structure；Second circuit topological structure includes: two the first submodules 11, is respectively provided with the first output electricity
Pressure；Two second submodules 12, are respectively provided with the second output voltage；The first submodule of two of them 11 and two second submodules
The series connection of 12 piecemeals, second submodule 12 and the tertiary circuit topological structure having the same of the first submodule 11, the second output voltage
It is 2 times of the first output voltage, the first output voltage is 1/6*Udc, and the output voltage of second submodule 12 is 1/3*Udc.
Table 1 is output voltage (Ua) and the corresponding table of submodule bulk state each in A circuitry phase of A circuitry phase.
Table 1
It is illustrated by taking voltage level 1 as an example.At this point, four submodules on the first half-bridge circuit 311 of A circuitry phase
The state of (i.e. two the first submodules 11 and two second submodules 12) is all 1, i.e. two the first submodules 11 and two
Two submodules 12 are involved in voltage output.A phase output voltage Ua is-Udc/2.
It is illustrated by taking voltage level 2 as an example.At this point, first submodule shape on the first half-bridge circuit 311 of A circuitry phase
State is 0 (being not involved in voltage output), and other three sub- module status on the first half-bridge circuit 311 of A circuitry phase (are joined for 1
With voltage output).That is, first submodule 11 and two second submodules 12 participate in voltage output.A phase output voltage Ua
For-Udc/3.
Exemplary illustrated to the utility model progress above using seven level MMC as example, those skilled in the art can anticipate
Know, the utility model can also be applied to the MMC of other level, the utility model embodiment is to this and is not limited.
The above, the only better embodiment of the utility model, are not intended to limit the guarantor of the utility model
Protect range.Within the spirit and principle of the utility model, any modification, equivalent replacement, improvement and so on should all include
It is within the protection scope of the utility model.
Claims (10)
1. the submodule unit of modularization multi-level converter characterized by comprising
One or more of first submodule has the first output voltage；
One or more of second submodule has the second output voltage；
Wherein first submodule is connected with the second submodule, and the second submodule has with first submodule
Identical circuit topological structure, second output voltage are N times of first output voltage, and wherein N is to be at least 2 just
Integer.
2. the submodule unit of modularization multi-level converter according to claim 1, which is characterized in that further include:
One or more of third submodule, with third output voltage；
Wherein the third submodule is connected with first submodule and the second submodule, the third submodule and institute
The first submodule circuit topological structure having the same is stated, the third output voltage is M times of first output voltage,
Middle M is to be at least 2 positive integer, and M is not equal to N.
3. the submodule unit of modularization multi-level converter according to claim 2, which is characterized in that further include:
One or more of 4th submodule has the 4th output voltage；
Wherein the 4th submodule is connected with first submodule, the second submodule and the third submodule, institute
The 4th submodule and the first submodule circuit topological structure having the same are stated, the 4th output voltage is described first
K times of output voltage, wherein K is the positive integer for being at least 2, and K is not equal to M, and K is not equal to N.
4. the submodule unit of modularization multi-level converter according to claim 3, which is characterized in that
First submodule, the second submodule, the third submodule and the 4th submodule piecemeal series connection are handed over
Mistake series connection.
5. the submodule unit of modularization multi-level converter described in any one of -4 according to claim 1, which is characterized in that
The circuit topological structure is semi-bridge type submodular circuits topological structure or bridge-type submodular circuits topological structure.
6. modularization multi-level converter characterized by comprising
The submodule unit of one or more modularization multi-level converters described in any one of -4 according to claim 1.
7. modularization multi-level converter characterized by comprising
A circuitry phase, connect with DC power supply；
B circuitry phase is connect with the DC power supply；
C circuitry phase is connect with the DC power supply；
Wherein the A circuitry phase, the B circuitry phase and the C circuitry phase the first circuit topological structure having the same；
First circuit topological structure includes: the first half-bridge circuit；Second half-bridge circuit；Current sharing inductor is connected on described
Between one half-bridge circuit and second half-bridge circuit；Wherein first half-bridge circuit has phase with second half-bridge circuit
Same second circuit topological structure；
The second circuit topological structure includes: one or more of first submodule, has the first output voltage；One or more
Second submodule, have the second output voltage；Wherein first submodule is connected with the second submodule, and described
The tertiary circuit topological structure having the same of first submodule described in two submodules, second output voltage are described first defeated
N times of voltage out, wherein N is the positive integer for being at least 2.
8. modularization multi-level converter according to claim 7, which is characterized in that the tertiary circuit topological structure is
Semi-bridge type submodular circuits topological structure or bridge-type submodular circuits topological structure.
9. modularization multi-level converter according to claim 7, which is characterized in that the N is 2 or 3 or 4.
10. modularization multi-level converter according to claim 7, which is characterized in that the N is 2, first output
Voltage is 1/6th of the voltage of the DC power supply.
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