CN103078538A - Combination clamping seven-level converter - Google Patents
Combination clamping seven-level converter Download PDFInfo
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- CN103078538A CN103078538A CN2013100086879A CN201310008687A CN103078538A CN 103078538 A CN103078538 A CN 103078538A CN 2013100086879 A CN2013100086879 A CN 2013100086879A CN 201310008687 A CN201310008687 A CN 201310008687A CN 103078538 A CN103078538 A CN 103078538A
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Abstract
The invention relates to a combination clamping seven-level converter, which is characterized by comprising a direct-current bus and three seven-level bridge arms, wherein the two ends of the direct-current bus are connected in parallel with the three seven-level bridge arms in sequence; each seven-level bridge arm is provided with an output end; and three-phase alternating-current voltage output is realized by using the three output ends of the three seven-level bridge arms. The combination clamping seven-level converter consists of the direct-current bus and the three seven-level bridge arms, the direct-current bus is formed by connecting three capacitors in series, each capacitor bears one third of a direct-current bus voltage, and each seven-level bridge arm consists of ten switching devices and four clamping capacitors. Different switching ways are used, so that seven-level output is realized, and voltage balance control over all capacitors can be realized. The combination clamping seven-level converter can be widely applied to power electronic multi-level converters.
Description
Technical field
The present invention relates to a kind of power electronics multi-level converter topological structure, particularly about a kind of combination clamping type seven level converters.
Background technology
The alternating current machine of high-voltage large-capacity is widely used in the various industrial circles.Adopt the high voltage converter of multilevel converter that high-voltage AC motor is carried out frequency control, not only can reach energy-conservation purpose, can also improve process conditions, improve production efficiency and product quality.At present, common many level of Clamp topology mainly contains two kinds on diode-clamped and capacitor-clamped type, but the output level number all is confined to below four level, all has shortcomings when exporting more high level, is difficult to use in practice.For example, seven level bridge arm structures (as shown in Figure 1) of diode-clamped, there is following shortcoming in it: 1, increasing along with the output level number, the number of clamping diode sharply increases, and each brachium pontis of seven level structures needs 30 diodes, and circuit structure is complicated, cost increases, and reliability is lower.2, bus capacitor voltages at different levels are difficult to balance, need extra hardware circuit.These drawbacks limit diode-clamped topology toward higher level number development.And seven level bridge arm structures (as shown in Figure 2) of capacitor-clamped type, also there is similar shortcoming in it: must use a large amount of clamping capacitances, and also must adopt a large amount of capacitances in series in order to bear high pressure, cause system's control complicated, cost increases, and reliability also reduces greatly.Therefore existing this two kind of seven level structure all is not suitable for promoting the use of industrial.
Summary of the invention
For the problems referred to above, the purpose of this invention is to provide and a kind ofly can greatly reduce clamping device and clamping capacitance quantity, and can realize combination clamping type seven level converters of seven level output.
For achieving the above object, the present invention takes following technical scheme: a kind of combination clamping type seven level converters, it is characterized in that: it comprises a dc bus and three seven level brachium pontis, the two ends of described dc bus described three the seven level brachium pontis that are connected in parallel successively, be provided with an output X5 ' and four input X1', X2', X3' and X4' on each described seven level brachium pontis, three output X5 ' output three-phase alternating voltages of described three seven level brachium pontis; Each described seven level brachium pontis includes two two level-cells and five level-cells, the input of two described two level-cells consists of four input X1', X2', X3' and X4' of whole described seven level brachium pontis, the output of two described two level-cells connects respectively the input of described five level-cells, and clamping capacitance Cs of series connection between two described two level-cells; Each described two level-cell by the switching device S1 of two complementations,
S1Series connection consists of, and the emitter of first described switching device S1 connects the switching device complementary with it
S1Collector electrode, switching device
S1Emitter be connected with another described two level-cells through described clamping capacitance Cs; The collector electrode of first described switching device S1, switching device
S1Emitter consist of first input terminal X1' and second input terminal X2'; Described five level-cells comprise six in twos complementary switching device S3,
S3, S4,
S4, S5 and
S5And three clamping capacitance C
F1, C
F2, C
F3One of them described two level-cell output connects the collector electrode of the 3rd described switching device S3, and the emitter of the 3rd described switching device S3 connects the collector electrode of the 5th described switching device S5 through the 4th described switching device S4; The output of another described two level-cells connects the switching device with the 3rd described switching device S3 complementation
S3Emitter, switching device
S3Collector electrode through with the switching device of the 4th described switching device S4 complementation
S4Connect the switching device with the 5th described switching device S5 complementation
S5Emitter; The 3rd described switching device S3 collector electrode with
S3First described clamping capacitance C in parallel between the emitter
F1, at common port and the switching device of the 3rd described switching device S3, the 4th described switching device S4
S3,
S4Common port between second described clamping capacitance C in parallel
F2, at common port and the switching device of the 4th described switching device S4, the 5th described switching device S5
S4,
S5Common port between the 3rd described clamping capacitance C in parallel
F3, emitter and the switching device of the 5th described switching device S5
S5Collector electrode connect after, draw lead-out terminal X5'.
Described dc bus comprises three identical series capacitance C
D1, C
D2And C
D3, each electric capacity bears 1/3 DC bus-bar voltage; In first described capacitor C
D1Positive ends draw first power terminal X1, in first described capacitor C
D1With second described capacitor C
D2Between draw second power terminal X2, second described capacitor C
D2With the 3rd described capacitor C
D3Between draw the 3rd power terminal X3, the 3rd described capacitor C
D3The negative polarity end draw the 4th power terminal X4; Described first power terminal X1 and the 4th power terminal X4, respectively with the upper/lower terminal of three described seven level brachium pontis first, the 4th input X1', X4' be in parallel; Be positioned at second power terminal X2 and the 3rd the power terminal X3 at described dc bus middle part, in parallel with second, the 3rd input X2', X3' of three described seven level brachium pontis respectively.
Described clamping capacitance C
sRemain 1/3 DC bus-bar voltage, clamping capacitance C
F1Remain 2/3 DC bus-bar voltage, clamping capacitance C
F2Remain 1/3 DC bus-bar voltage, clamping capacitance C
F3Remain 1/6 DC bus-bar voltage.
Ten switching devices in each described seven level brachium pontis adopt MOSFET, IGBT or IGCT.
The present invention is owing to taking above technical scheme, it has the following advantages: 1, the present invention is comprised of dc bus and three seven level brachium pontis owing to adopting, dc bus is formed by three capacitances in series, each electric capacity bears 1/3 DC bus-bar voltage, and each seven level brachium pontis is comprised of ten switching devices and four clamping capacitances, therefore, greatly reduced the quantity of switching device and clamping capacitance, simplified circuit structure, reliability is higher, has realized the output of seven level with less device.2, the present invention is because each seven level brachium pontis includes ten in twos switching device and four clamping capacitances of complementation, ten in twos complementary switching device can form multiple on-off mode, like this according to the difference of controlling target, the different on-off mode of capable of choosing multiple when exporting identical voltage.By using different on-off modes, just can realize the balance of voltage control of all electric capacity.The present invention can be widely used in the power electronics multi-level converter topological structure.
Description of drawings
Fig. 1 is diode-clamped seven level converter bridge arm structure figure in the prior art;
Fig. 2 is capacitor-clamped type seven level converter bridge arm structure figure in the prior art;
Fig. 3 is overall structure schematic diagram of the present invention;
Fig. 4 is DC bus structure schematic diagram of the present invention;
Fig. 5 is seven level bridge arm structure schematic diagrames of the present invention.
Embodiment
Below in conjunction with drawings and Examples the present invention is described in detail.
As shown in Figure 3, the present invention includes a dc bus 1 and three seven level brachium pontis 2, the two ends of dc bus 1 three the seven level brachium pontis 2 that are connected in parallel successively, be provided with an output X5 ' and four input X1', X2', X3' and X4' on each seven level brachium pontis 2, three output X5 ' of three seven level brachium pontis 2 realize three-phase alternating voltage output jointly.
As shown in Figure 4, dc bus 1 comprises three identical series capacitance C
D1, C
D2And C
D3, each electric capacity bears 1/3 DC bus-bar voltage.In first capacitor C
D1Positive ends draw first power terminal X1, in first capacitor C
D1With second capacitor C
D2Between draw second power terminal X2, second capacitor C
D2With the 3rd capacitor C
D3Between draw the 3rd power terminal X3, the 3rd capacitor C
D3The negative polarity end draw the 4th power terminal X4.Be positioned at first power terminal X1 and the 4th the power terminal X4 at dc bus 1 two ends, respectively with the upper/lower terminal of three seven level brachium pontis 2 first, the 4th input X1', X4' be in parallel; Be positioned at second power terminal X2 and the 3rd the power terminal X3 at dc bus 1 middle part, in parallel with second, the 3rd input X2', X3' of three seven level brachium pontis 2 respectively.
As shown in Figure 5, each seven level brachium pontis 2 includes two two level-cells 21 and five level-cells 22, the input of two two level-cells 21 consists of four input X1', X2', X3' and X4' of whole seven level brachium pontis 2, the output of two two level-cells 21 connects respectively the input of five level-cells 22, and clamping capacitance Cs of series connection between two two level-cells 21, clamping capacitance Cs is used for preventing the voltage jump between the input X2 ' and X3 ' under the current intelligence, guarantees that the potential difference between two two level-cells 21 is constant; The output of five level-cells 22 is the output X5 ' of whole seven level brachium pontis 2.
Each two level-cell 21 by the switching device S1 (S2) of two complementations,
S1(
S2) the series connection formation, the emitter connecting valve device of switching device S1
S1Collector electrode, switching device
S1Emitter be connected with another two level-cell 21 through clamping capacitance Cs.Wherein, the collector electrode of switching device S1, switching device
S1Emitter consist of first input terminal X1' and second input terminal X2'.Namely the collector electrode of switching device S1, S2 draw respectively first, the 3rd power terminal X1', X3', switching device
S1,
S2Emitter draw respectively second, four power terminal X2', X4'.Wherein, first, the 4th power terminal X1', X4' connect respectively dc bus 1 first, the 4th power terminal X1, X4; Second, the 3rd power terminal X2', X3' connect respectively second, the 3rd power terminal X2, X3 of dc bus 1.
Five level-cells 22 comprise six in twos complementary switching device S3,
S3, S4,
S4, S5 and
S5And three clamping capacitance C
F1, C
F2, C
F3The collector electrode of the output connecting valve device S3 of one of them two level-cell 21, the emitter of switching device S3 is through the collector electrode of switching device S4 connecting valve device S5; The output connecting valve device of another two level-cell 21
S3Emitter, switching device
S3Collector electrode through switching device
S4The connecting valve device
S5Emitter.Switching device S3 collector electrode with
S3First clamping capacitance C in parallel between the emitter
F1, at common port and the switching device of switching device S3, S4
S3,
S4Common port between second clamping capacitance C in parallel
F2, at common port and the switching device of switching device S4, S5
S4,
S5Common port between the 3rd clamping capacitance C in parallel
F3, the emitter of switching device S5 and switching device
S5Collector electrode connect after, draw lead-out terminal X5'.
In above-described embodiment, clamping capacitance C
sRemain 1/3 DC bus-bar voltage, clamping capacitance C
F1Remain 2/3 DC bus-bar voltage, clamping capacitance C
F2Remain 1/3 DC bus-bar voltage, clamping capacitance C
F3Remain 1/6 DC bus-bar voltage, switching device S1 and switching device
S1, switching device S2 and switching device
S2, switching device S3 and switching device
S3, switching device S4 and switching device
S4, switching device S5 and switching device
S5Complementary respectively, namely when wherein some switching devices were opened, corresponding complementary switch device turn-offed.
In the various embodiments described above, difference according to the DC bus-bar voltage grade, ten switching devices in each seven level brachium pontis 2 can be selected the corresponding power semiconductor switch of variety classes, such as adopting MOSFET (field-effect transistor), IGBT(igbt) or IGCT (integrated gate commutated thyristor) etc., also can adopt the serial or parallel connection of above-mentioned switching device to realize more high voltage and electric current.
In sum, the present invention in use, the total voltage of supposing dc bus 1 is 6E, then the capacitor C in the dc bus 1
D1, C
D2And C
D3Voltage be 2E, clamping capacitance C
sVoltage be 2E, clamping capacitance C
F1Voltage also be 4E, clamping capacitance C
F2Voltage be 2E, clamping capacitance C
F3Voltage be E.When requiring output voltage to be Vo=6E, only have a kind of on-off mode, namely open switching device S1, S2, S3, S4 and S5, the rest switch device turn-offs.
When requiring output voltage to be Vo=5E, have two kinds of on-off modes, the one, open switching device S1, S2, S3, S4 and
S5, the rest switch device turn-offs; The 2nd, open switching device S1, S2, S3,
S4And S5, the rest switch device turn-offs.
When requiring output voltage to be Vo=4E, have three kinds of on-off modes, the one, open switching device S1, S2, S3,
S4With
S5, the rest switch device turn-offs; The 2nd, open switching device S1, S2,
S3, S4 and S5, the rest switch device turn-offs; The 3rd, open switching device
S1,
S2, S3, S4 and S5, the rest switch device turn-offs.
When requiring output voltage to be Vo=3E, have four kinds of on-off modes, the one, open switching device S1, S2,
S3,
S4And S5, the rest switch device turn-offs; The 2nd, open switching device S1, S2,
S3, S4 and
S5, the rest switch device turn-offs; The 3rd, open switching device
S1,
S2, S3,
S4And S5, the rest switch device turn-offs; The 4th, open switching device
S1,
S2, S3, S4 and
S5, the rest switch device turn-offs.
When requiring output voltage to be Vo=2E, have three kinds of on-off modes, the one, open switching device S1, S2,
S3,
S4With
S5, the rest switch device turn-offs; The 2nd, open switching device
S1,
S2,
S3, S4 and S5, the rest switch device turn-offs; The 3rd, open switching device
S1,
S2, S3,
S4With
S5, the rest switch device turn-offs.
When requiring output voltage to be Vo=E, have two kinds of on-off modes, the one, open switching device
S1,
S2,
S3, S4 and
S5, the rest switch device turn-offs; The 2nd, open switching device
S1,
S2,
S3,
S4And S5, the rest switch device turn-offs.
When requiring output voltage to be Vo=0, only have a kind of on-off mode, namely open switching device
S1,
S2,
S3,
S4With
S5, the rest switch device turn-offs.
According to the difference of control target, can select different on-off modes when exporting identical voltage, can realize the balance of voltage control of each electric capacity with this.All on-off modes are with as shown in table 1 with the truth table of output voltage.
The on-off mode of table 1 combination clamping type seven level converters with the truth table of output voltage
| S1 | S2 | S3 | S4 | S5 | Vo |
| 0 | 0 | 0 | 0 | 0 | 0 |
| 0 | 0 | 0 | 0 | 1 | E |
| 0 | 0 | 0 | 1 | 0 | E |
| 0 | 0 | 0 | 1 | 1 | 2E |
| 0 | 0 | 1 | 0 | 0 | 2E |
| 1 | 1 | 0 | 0 | 0 | 2E |
| 0 | 0 | 1 | 0 | 1 | 3E |
| 0 | 0 | 1 | 1 | 0 | 3E |
| 1 | 1 | 0 | 0 | 1 | 3E |
| 1 | 1 | 0 | 1 | 0 | 3E |
| 0 | 0 | 1 | 1 | 1 | 4E |
| 1 | 1 | 0 | 1 | 1 | 4E |
| 1 | 1 | 1 | 0 | 0 | 4E |
| 1 | 1 | 1 | 0 | 1 | 5E |
| 1 | 1 | 1 | 1 | 0 | 5E |
| 1 | 1 | 1 | 1 | 1 | 6E |
The various embodiments described above only are used for explanation the present invention; the connection of each parts and structure all can change to some extent; on the basis of technical solution of the present invention; all improvement and equivalents of connection and the structure of individual component being carried out according to the principle of the invention all should not got rid of outside protection scope of the present invention.
Claims (5)
1. combination clamping type seven level converters, it is characterized in that: it comprises a dc bus and three seven level brachium pontis, the two ends of described dc bus described three the seven level brachium pontis that are connected in parallel successively, be provided with an output X5 ' and four input X1', X2', X3' and X4' on each described seven level brachium pontis, three output X5 ' output three-phase alternating voltages of described three seven level brachium pontis;
Each described seven level brachium pontis includes two two level-cells and five level-cells, the input of two described two level-cells consists of four input X1', X2', X3' and X4' of whole described seven level brachium pontis, the output of two described two level-cells connects respectively the input of described five level-cells, and clamping capacitance Cs of series connection between two described two level-cells;
Each described two level-cell by the switching device S1 of two complementations,
S1Series connection consists of, and the emitter of first described switching device S1 connects the switching device complementary with it
S1Collector electrode, switching device
S1Emitter be connected with another described two level-cells through described clamping capacitance Cs; The collector electrode of first described switching device S1, switching device
S1Emitter consist of first input terminal X1' and second input terminal X2';
Described five level-cells comprise six in twos complementary switching device S3,
S3, S4,
S4, S5 and
S5And three clamping capacitance C
F1, C
F2, C
F3One of them described two level-cell output connects the collector electrode of the 3rd described switching device S3, and the emitter of the 3rd described switching device S3 connects the collector electrode of the 5th described switching device S5 through the 4th described switching device S4; The output of another described two level-cells connects the switching device with the 3rd described switching device S3 complementation
S3Emitter, switching device
S3Collector electrode through with the switching device of the 4th described switching device S4 complementation
S4Connect the switching device with the 5th described switching device S5 complementation
S5Emitter; The 3rd described switching device S3 collector electrode with
S3First described clamping capacitance C in parallel between the emitter
F1, at common port and the switching device of the 3rd described switching device S3, the 4th described switching device S4
S3,
S4Common port between second described clamping capacitance C in parallel
F2, at common port and the switching device of the 4th described switching device S4, the 5th described switching device S5
S4,
S5Common port between the 3rd described clamping capacitance C in parallel
F3, emitter and the switching device of the 5th described switching device S5
S5Collector electrode connect after, draw lead-out terminal X5'.
2. a kind of combination clamping type seven level converters as claimed in claim 1, it is characterized in that: described dc bus comprises three identical series capacitance C
D1, C
D2And C
D3, each electric capacity bears 1/3 DC bus-bar voltage; In first described capacitor C
D1Positive ends draw first power terminal X1, in first described capacitor C
D1With second described capacitor C
D2Between draw second power terminal X2, second described capacitor C
D2With the 3rd described capacitor C
D3Between draw the 3rd power terminal X3, the 3rd described capacitor C
D3The negative polarity end draw the 4th power terminal X4; Described first power terminal X1 and the 4th power terminal X4, respectively with the upper/lower terminal of three described seven level brachium pontis first, the 4th input X1', X4' be in parallel; Be positioned at second power terminal X2 and the 3rd the power terminal X3 at described dc bus middle part, in parallel with second, the 3rd input X2', X3' of three described seven level brachium pontis respectively.
3. a kind of combination clamping type seven level converters as claimed in claim 1 is characterized in that: described clamping capacitance C
sRemain 1/3 DC bus-bar voltage, clamping capacitance C
F1Remain 2/3 DC bus-bar voltage, clamping capacitance C
F2Remain 1/3 DC bus-bar voltage, clamping capacitance C
F3Remain 1/6 DC bus-bar voltage.
4. a kind of combination clamping type seven level converters as claimed in claim 2 is characterized in that: described clamping capacitance C
sRemain 1/3 DC bus-bar voltage, clamping capacitance C
F1Remain 2/3 DC bus-bar voltage, clamping capacitance C
F2Remain 1/3 DC bus-bar voltage, clamping capacitance C
F3Remain 1/6 DC bus-bar voltage.
5. as claimed in claim 1 or 2 or 3 or 4 a kind of combination clamping type seven level converters, it is characterized in that: ten switching devices in each described seven level brachium pontis adopt MOSFET, IGBT or IGCT.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110601584A (en) * | 2019-08-23 | 2019-12-20 | 北方工业大学 | Three-phase seven-level bidirectional AC-DC converter |
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