CN103078541B - The Five-level voltage source inverter simplified - Google Patents
The Five-level voltage source inverter simplified Download PDFInfo
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- CN103078541B CN103078541B CN201310017414.0A CN201310017414A CN103078541B CN 103078541 B CN103078541 B CN 103078541B CN 201310017414 A CN201310017414 A CN 201310017414A CN 103078541 B CN103078541 B CN 103078541B
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Abstract
The Five-level voltage source inverter simplified, relates to a kind of Five-level voltage source inverter, belongs to converters field.The invention solves the problem that existing Five-level voltage source inverter topological structure is complicated, use number of devices is many.In parallel with two outputs of DC power supply after four capacitances in series of the Five-level voltage source inverter simplified, the first input end of five level buck circuit is connected with the positive pole of DC power supply, second input of five level buck circuit is connected with the link of electric capacity C2 with electric capacity C1, 3rd input of five level buck circuit is connected with the link of electric capacity C3 with electric capacity C2, the four-input terminal of five level buck circuit is connected with the link of electric capacity C4 with electric capacity C3, 5th input of five level buck circuit is connected with the negative pole of DC power supply, two outputs of five level buck circuit are connected with two inputs of two level voltage source inverter circuits respectively.The present invention is applicable to mesohigh, powerful application scenario.
Description
Technical field
The present invention relates to a kind of Five-level voltage source inverter, belong to converters field.
Background technology
Multi-level converter has that device voltage stress is low, output waveform total harmonic distortion factor (totalharmonicdistortion, THD) low, system electromagnetic interference (electromagneticinterference, the advantage such as EMI) little, loss is little, generated electricity by way of merging two or more grid systems, new forms of energy, fuel cell, speed regualtion of AC motor field very big concern.Multi-level converter is divided into diode clamp type, striding capacitance type and cascade connection type 3 kinds of fundamental types.Along with level number increases, clamper number of packages needed for it becomes 2 times of even quadratic relationship growths, and except increasing system cost and controlling except complexity, a large amount of devices means that the possibility broken down increases.And in order to obtain the output of more high level, people need more complicated topological structure usually, this shortcoming limits the application of multilevel converter.
Summary of the invention
The invention solves the problem that existing Five-level voltage source inverter topological structure is complicated, use number of devices is many, propose the Five-level voltage source inverter of simplification.
The present invention is made up of DC power supply, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, five level buck circuit and two level voltage source inverter circuits,
Electric capacity C1, electric capacity C2, electric capacity C3 and electric capacity C4 is in parallel with two outputs of DC power supply after connecting, described electric capacity C1, electric capacity C2, electric capacity C3 is identical with the capacitance of electric capacity C4, the first input end of five level buck circuit is connected with the positive pole of DC power supply, second input of five level buck circuit is connected with the link of electric capacity C2 with electric capacity C1, 3rd input of five level buck circuit is connected with the link of electric capacity C3 with electric capacity C2, the four-input terminal of five level buck circuit is connected with the link of electric capacity C4 with electric capacity C3, 5th input of five level buck circuit is connected with the negative pole of DC power supply, first output of five level buck circuit is connected with the first input end of two level voltage source inverter circuits, second output of five level buck circuit is connected with the second input of two level voltage source inverter circuits,
Described five level buck circuit (2) are by nine IGBT switch (S
b1, S
b2,s
b3,s
b4,s
b5,s
b6,s
b7,s
b8and S
b9) composition, an IGBT switch (S
b1) collector electrode as the first input end (P) of five level buck circuit (2), an IGBT switch (S
b1) emitter and the 2nd IGBT switch (S
b2) collector electrode be connected after as the first output of five level buck circuit (2), the 2nd IGBT switch (S
b2) emitter simultaneously with the 3rd IGBT switch (S
b3) emitter and the 4th IGBT switch (S
b4) collector electrode be connected, described 3rd IGBT switch (S
b3) collector electrode as the second input of five level buck circuit (2), the 4th IGBT switch (S
b4) emitter simultaneously with the 5th IGBT switch (S
b5) collector electrode and the 6th IGBT switch (S
b6) collector electrode be connected, described 5th IGBT switch (S
b5) emitter as the 3rd input of five level buck circuit (2), the 6th IGBT switch (S
b6) emitter simultaneously with the 7th IGBT switch (S
b7) collector electrode and the 8th IGBT switch (S
b8) collector electrode be connected, described 7th IGBT switch (S
b7) emitter as the four-input terminal of five level buck circuit (2), the 8th IGBT switch (S
b8) emitter terminal and the 9th IGBT switch (S
b9) collector terminal be connected after as the second output of five level buck circuit (2), the 9th IGBT switch (S
b9) emitter terminal as the 5th input (N) of five level buck circuit (2).
Its complex structure of existing five-electrical level inverter, each phase exports brachium pontis all needs 8 IGBT switches and 6 clamp diodes; And novel topological structure of the present invention is after embedding depression of order circuit, every phase brachium pontis only need two IGBT switches and without any need for clamper diode, enormously simplify the topological structure of inverter.This invention simplifies the topological structure of five level, reduce the quantity of device, and achieve the output of more high level, make multilevel converter obtain better, widely applying.
Accompanying drawing explanation
Fig. 1 is the topological structure schematic diagram of the Five-level voltage source inverter simplified.
Embodiment
Embodiment one: present embodiment is described see Fig. 1, the Five-level voltage source inverter of the simplification described in present embodiment, it is made up of DC power supply 1, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, five level buck circuit 2 and two level voltage source inverter circuits 3
In parallel with two outputs of DC power supply 1 after electric capacity C1, electric capacity C2, electric capacity C3 and electric capacity C4 series connection, described electric capacity C1, electric capacity C2, electric capacity C3 are identical with the capacitance of electric capacity C4, the first input end P of five level buck circuit 2 is connected with the positive pole of DC power supply 1, the second input of five level buck circuit 2 and the link O of electric capacity C1 and electric capacity C2
1be connected, the 3rd input of five level buck circuit 2 and the link O of electric capacity C2 and electric capacity C3
2be connected, the four-input terminal of five level buck circuit 2 and the link O of electric capacity C3 and electric capacity C4
3be connected, 5th input N of five level buck circuit 2 is connected with the negative pole of DC power supply 1, first output of five level buck circuit 2 is connected with the first input end P' of two level voltage source inverter circuits 3, and the second output of five level buck circuit 2 is connected with the second input N' of two level voltage source inverter circuits 3.
Embodiment two: the difference of the Five-level voltage source inverter of present embodiment and the simplification described in embodiment one is, described five level buck circuit 2 are by nine IGBT switch S
b1, S
b2, S
b3, S
b4, S
b5, S
b6, S
b7, S
b8and S
b9composition, a described IGBT switch S
b1collector electrode as the first input end P of five level buck circuit 2, an IGBT switch S
b1emitter and the 2nd IGBT switch S
b2collector electrode be connected after as the first output of five level buck circuit 2, the 2nd IGBT switch S
b2emitter simultaneously with the 3rd IGBT switch S
b3emitter and the 4th IGBT switch S
b4collector electrode be connected, described 3rd IGBT switch S
b3collector electrode as the second input of five level buck circuit 2, the 4th IGBT switch S
b4emitter simultaneously with the 5th IGBT switch S
b5collector electrode and the 6th IGBT switch S
b6collector electrode be connected, described 5th IGBT switch S
b5emitter as the 3rd input of five level buck circuit 2, the 6th IGBT switch S
b6emitter simultaneously with the 7th IGBT switch S
b7collector electrode and the 8th IGBT switch S
b8collector electrode be connected, described 7th IGBT switch S
b7emitter as the four-input terminal of five level buck circuit 2, the 8th IGBT switch S
b8emitter terminal and the 9th IGBT switch S
b9collector terminal be connected after as the second output of five level buck circuit 2, the 9th IGBT switch S
b9emitter terminal as the 5th input N of five level buck circuit 2.
Embodiment three: the difference of the Five-level voltage source inverter of present embodiment and the simplification described in embodiment two is, two level V that the state of nine IGBT switches of described five level buck circuit 2 and two outputs of described five level buck circuit 2 export
p'and V
n'between relation as shown in Table 1:
Table one
V in table
dCrepresent the voltage magnitude at electric capacity C1 two ends.
Be similar to traditional three level neutral-point-clamped voltage source inverter, this inverter is powered by electric capacity C1, C2, C3, C4 of 4 series connection, and they are charged and have identical voltage magnitude V
dC.DC side mid point, the end points O namely between electric capacity C2 and electric capacity C3
2as direct voltage source 4V
dCneutral point.If this DC side mid point O
2voltage magnitude as a reference, obviously can obtain 5 output level: 2V
dC(V
pO2), V
dC(V
pO1), 0 ,-V
dC(V
nO1) ,-2V
dC(V
nO2).In order to prevent dc-side short-circuit, the combination of on off state receives certain restriction.See the switch combination in present embodiment shown in table 1, at any time, five level buck levels can provide two power supply electrical levels to inverter two ends.
Embodiment four: the difference of the Five-level voltage source inverter of present embodiment and the simplification described in embodiment one is, described two level voltage source inverter circuits 3 are three-phase inversion bridge circuit.
Three switching tube S of the upper brachium pontis of described three phase inverter bridge
ap, S
bp, S
cpcollector electrode be connected together, form the first input end P' of two level voltage source inverter circuits 3, three switching tube S of the lower brachium pontis of three phase inverter bridge
an, S
bn, S
cnemitter be connected together, form the second input N' of two level voltage source inverter circuits 3,
First output of described five level buck circuit 2 is connected with the first input end P' of two level voltage source inverter circuits 3, second output of five level buck circuit 2 is connected with the second input N' of two level voltage source inverter circuits 3, the output of two level voltage source inverter circuits 3 exports three-phase inversion signal, and threephase load adopts Y-connection mode to be connected with the output of two level voltage source inverter circuits 3.
Embodiment five: the difference of the Five-level voltage source inverter of present embodiment and the simplification described in embodiment four is, two switching tube S up and down of each phase brachium pontis in three brachium pontis of described two level voltage source inverter circuits 3
xpand S
xnstate, the state of nine IGBT switches of five level buck circuit and described two level voltage source inverter circuit 3 output end voltage V
xobetween relation as shown in Table 2,
Table two
| S B1 | S B2 | S B3 | S B4 | S B5 | S B6 | S B7 | S B8 | S B9 | S xp | S xn | Output end voltage V xo |
| 1 | 0 | 1 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 2V DC |
| 1 | 0 | 1 | 1 | 0 | 1 | 0 | 1 | 0 | 0 | 1 | V DC |
| 1 | 0 | 0 | 0 | 1 | 1 | 0 | 1 | 0 | 1 | 0 | 2V DC |
| 1 | 0 | 0 | 0 | 1 | 1 | 0 | 1 | 0 | 0 | 1 | 0 |
| 1 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 1 | 0 | 2V DC |
| 1 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 1 | -V DC |
| 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 2V DC |
| 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | -2V DC |
| 0 | 1 | 0 | 1 | 1 | 1 | 0 | 1 | 0 | 1 | 0 | 0 |
| 0 | 1 | 0 | 1 | 1 | 1 | 0 | 1 | 0 | 0 | 1 | 0 |
| 0 | 1 | 0 | 1 | 0 | 1 | 1 | 0 | 1 | 1 | 0 | V DC |
| 0 | 1 | 0 | 1 | 0 | 1 | 1 | 0 | 1 | 0 | 1 | -2V DC |
| 0 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 1 | 1 | 0 | 0 |
| 0 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 1 | 0 | 1 | -2V DC |
| 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | -V DC |
| 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | -2V DC |
In table, S
xprepresent the switching tube of upside in x phase brachium pontis, S
xnrepresent the switching tube of downside in x phase brachium pontis, wherein x ∈ { a, b, c}; V
dCrepresent the voltage magnitude at electric capacity C1 two ends.
The state of upper and lower two switching tubes of each phase brachium pontis of two level voltage source inverter circuits in present embodiment is different, and as shown in table 2, each output end voltage in novel multi-level converter topology structure has voltage level possible in 5: 2V
dC, V
dC, 0 ,-V
dC,-2V
dC.These level prove, compared with traditional three level neutral-point-clamped voltage source inverter, this topological structure has the ability of the higher output level of generation.
Claims (4)
1. the Five-level voltage source inverter simplified, it is made up of DC power supply (1), electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, five level buck circuit (2) and two level voltage source inverter circuits (3),
In parallel with two outputs of DC power supply (1) after electric capacity C1, electric capacity C2, electric capacity C3 and electric capacity C4 series connection, described electric capacity C1, electric capacity C2, electric capacity C3 are identical with the capacitance of electric capacity C4, the first input end (P) of five level buck circuit (2) is connected with the positive pole of DC power supply (1), the second input of five level buck circuit (2) and the link (O of electric capacity C1 and electric capacity C2
1) be connected, the 3rd input of five level buck circuit (2) and the link (O of electric capacity C2 and electric capacity C3
2) be connected, the four-input terminal of five level buck circuit (2) and the link (O of electric capacity C3 and electric capacity C4
3) be connected, 5th input (N) of five level buck circuit (2) is connected with the negative pole of DC power supply (1), first output of five level buck circuit (2) is connected with the first input end (P ') of two level voltage source inverter circuits (3), and the second output of five level buck circuit (2) is connected with second input (N ') of two level voltage source inverter circuits (3);
It is characterized in that, described five level buck circuit (2) are by nine IGBT switch (S
b1, S
b2, S
b3, S
b4, S
b5, S
b6, S
b7, S
b8and S
b9) composition, an IGBT switch (S
b1) collector electrode as the first input end (P) of five level buck circuit (2), an IGBT switch (S
b1) emitter and the 2nd IGBT switch (S
b2) collector electrode be connected after as the first output of five level buck circuit (2), the 2nd IGBT switch (S
b2) emitter simultaneously with the 3rd IGBT switch (S
b3) emitter and the 4th IGBT switch (S
b4) collector electrode be connected, described 3rd IGBT switch (S
b3) collector electrode as the second input of five level buck circuit (2), the 4th IGBT switch (S
b4) emitter simultaneously with the 5th IGBT switch (S
b5) collector electrode and the 6th IGBT switch (S
b6) collector electrode be connected, described 5th IGBT switch (S
b5) emitter as the 3rd input of five level buck circuit (2), the 6th IGBT switch (S
b6) emitter simultaneously with the 7th IGBT switch (S
b7) collector electrode and the 8th IGBT switch (S
b8) collector electrode be connected, described 7th IGBT switch (S
b7) emitter as the four-input terminal of five level buck circuit (2), the 8th IGBT switch (S
b8) emitter terminal and the 9th IGBT switch (S
b9) collector terminal be connected after as the second output of five level buck circuit (2), the 9th IGBT switch (S
b9) emitter terminal as the 5th input (N) of five level buck circuit (2).
2. the Five-level voltage source inverter of simplification according to claim 1, it is characterized in that, two level V that the state of nine IGBT switches of described five level buck circuit (2) and two outputs of described five level buck circuit (2) export
p 'and V
n 'between relation as shown in Table 1:
Table one
V in table
dCrepresent the voltage magnitude at electric capacity C1 two ends.
3. the Five-level voltage source inverter of simplification according to claim 1, is characterized in that, described two level voltage source inverter circuits (3) are three-phase inversion bridge circuit.
4. the Five-level voltage source inverter of simplification according to claim 3, is characterized in that, two switching tube (S up and down of each phase brachium pontis in three brachium pontis of described two level voltage source inverter circuits (3)
xpand S
xn) state, the state of nine IGBT switches of five level buck circuit and described two level voltage source inverter circuit (3) output end voltage V
xobetween relation as shown in Table 2,
Table two
In table, S
xprepresent the switching tube of upside in x phase brachium pontis, S
xnrepresent the switching tube of downside in x phase brachium pontis, wherein x ∈ { a, b, c}; V
dCrepresent the voltage magnitude at electric capacity C1 two ends.
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| CN105048841A (en) * | 2015-07-13 | 2015-11-11 | 中国电子科技集团公司第十研究所 | Three-phase multi-level inverter |
| CN106208894B (en) * | 2016-08-24 | 2019-01-04 | 清华大学 | A kind of polyphase machine drive system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201008128Y (en) * | 2005-08-29 | 2008-01-16 | 诸江 | Multi-level stack type inverter |
| CN101667790A (en) * | 2009-09-25 | 2010-03-10 | 浙江工贸职业技术学院 | High power DA conversion circuit |
| CN102763316A (en) * | 2010-02-15 | 2012-10-31 | 西门子公司 | Single phase multilevel inverter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2012253862A (en) * | 2011-06-01 | 2012-12-20 | Hitachi Ltd | Power storage system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201008128Y (en) * | 2005-08-29 | 2008-01-16 | 诸江 | Multi-level stack type inverter |
| CN101667790A (en) * | 2009-09-25 | 2010-03-10 | 浙江工贸职业技术学院 | High power DA conversion circuit |
| CN102763316A (en) * | 2010-02-15 | 2012-10-31 | 西门子公司 | Single phase multilevel inverter |
Non-Patent Citations (1)
| Title |
|---|
| Simple Structure and Control Method for a Neutral-Point-Clamped PWM Inverter;Roberto Rojas et al;《Conference Record of the Power Conversion Conference, 1993. Yokohama 1993.》;19930421;第26-31页 * |
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