CN203827193U - 2N+2 switch group MMC AC-AC converter - Google Patents

2N+2 switch group MMC AC-AC converter Download PDF

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Publication number
CN203827193U
CN203827193U CN201420143757.1U CN201420143757U CN203827193U CN 203827193 U CN203827193 U CN 203827193U CN 201420143757 U CN201420143757 U CN 201420143757U CN 203827193 U CN203827193 U CN 203827193U
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brachium pontis
switches set
inductance
input
output
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张波
付坚
丘东元
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South China University of Technology SCUT
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South China University of Technology SCUT
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Abstract

The utility model provides a 2N+2 switch group modular multilevel converter (MMC) AC-AC converter comprising N input/output units, a first bridge arm, a second bridge arm and a capacitor. The input of each input/output unit is the alternating-current one; and the load of each input/output unit is the inductive load. Each of the first bridge arm and the second bridge arm is formed by series connection of N+1 switch groups and two inductors; and each switch group is formed by series connection of n power switch units. The sum of the number of the alternating-current inputs and the loads is N; the two ends of each load server as outputs; and the N is larger than 2 and n is a positive integer. According to the scheme, the converter employs the carrier phase-shifting PWM controlling mode. Each input alternating-current power supply is converted into alternating-current input with the 2n+1 level; after AC-AC conversion, the alternating-current input with the 2n+1 level is obtained and is provided for the inductive loads for power supplying. Moreover, the voltage stress that each switching tube bears in the MMC power switch unit is one one-nth of the direct-current power voltage. The provided converter can be applied to high-voltage and high-power occasions.

Description

2N+2 switches set MMC AC-AC converter
Technical field
The utility model relates to module combination multi-level converter (MMC) field, is specifically related to a kind of 2N+2 switches set MMC AC-AC converter.
Background technology
, there is the direction of two kinds of improvement converters at present power inverter forward miniaturization, high reliability and low-loss future development: reduce passive device or improve converter topology structure and using and reduce active device as the new development that reduces active device direction under this trend.Single-phase 2N+2 switch AC-AC converter has reduced 2N-2 switch and corresponding drive circuit with respect to traditional 4N switch AC-AC converter, in the application of considering cost and volume, occupies certain advantage.Yet single-phase the inputing or outputing in N road of 2N+2 switch AC-AC converter is three level, input and output AC wave shape is poor.In addition, half that the voltage stress that in 2N+2 switch, each switch bears is DC bus-bar voltage, and there is the voltage-sharing of 2N+2 switching tube, this has limited single-phase 2N+2 switch AC-AC converter greatly in the application of high pressure and large-power occasions.
In recent years, multilevel technology is constantly promoted, and successful Application is at industrial circles such as high voltage direct current transmission, Electric Drive, active power filtering, static synchroballistic, common voltage-type multi-level converter topology is broadly divided into case bit-type and the large class of unit cascaded type two at present.Module combination multi-level converter (Modular Multilevel Converter, MMC) as a kind of novel many level topologys, except having advantages of traditional multi-level converter, module combination multi-level converter adopts Modular Structure Design, is convenient to System Expansion and redundancy of effort; Have unbalanced operation ability, fault traversing and recovery capability, system reliability is high; Owing to having common DC bus, module combination multi-level converter is particularly useful for HVDC (High Voltage Direct Current) transmission system application.Yet, when the alternating current circuit of N bar different frequency connected, needing 2N MMC converter, this has increased engineering cost greatly.
Utility model content
The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, proposes a kind of 2N+2 switches set MMC AC-AC converter.
The technical solution adopted in the utility model is: 2N+2 switches set MMC AC-AC converter comprises N I/O, the first brachium pontis, the second brachium pontis and the first electric capacity; Described I/O is for inputing or outputing, and input is to exchange input, and output is inductive load; Described the first brachium pontis is in series by N+1 switches set and 2 inductance, and described the second brachium pontis is in series by N+1 switches set and 2 inductance; I switches set of the first brachium pontis is in series by n power switch unit, and i switches set of the second brachium pontis is in series by n power switch unit, and wherein the value of i is 1～N+1; N>2, n is positive integer.
Two inductance of the first brachium pontis intercouple, and form a pair of coupling inductance; Two inductance of the second brachium pontis intercouple, and form a pair of coupling inductance.
In described 2N+2 switches set MMC AC-AC converter, the lower end of the 1st switches set of the first brachium pontis is connected with one end of the first inductance of 2 inductance in the first brachium pontis, and the other end of the first inductance of the first brachium pontis is connected with the upper end of the 2nd switches set of the first brachium pontis; The lower end of i switches set of the first brachium pontis is connected with the upper end of i+1 switches set of the first brachium pontis, and wherein the value of i is 2～N-1; The lower end of N switches set of the first brachium pontis is connected with one end of the second inductance of the first brachium pontis, and the other end of the second inductance of the first brachium pontis is connected with the upper end of N+1 switches set of the first brachium pontis; The circuit structure of the circuit structure of the second brachium pontis and the first brachium pontis is in full accord; The two ends of k I/O respectively with the upper end of k+1 switches set of the first brachium pontis, the upper end of k+1 switches set of the second brachium pontis is connected, wherein the value of k is 1～N-1; The two ends of N I/O are connected with the lower end of N switches set of the first brachium pontis, the lower end of N switches set of the second brachium pontis respectively; The upper end of the 1st switches set of the first brachium pontis is connected with the upper end of the 1st switches set of the second brachium pontis, the positive pole of the first electric capacity, the negative pole of the first electric capacity with the lower end of N switches set of the first brachium pontis, the lower end of N switches set of the second brachium pontis, hold and be connected.
When k I/O inputted for exchanging, this interchange input consists of alternating current input power supplying and input inductance, one end of alternating current input power supplying is connected with one end of input inductance, the other end of alternating current input power supplying exchanges one end of input as this, the other end that the other end of input inductance exchanges input as this, wherein the value of k is 1～N; When k I/O is inductive load, this inductive load consists of output resistance and outputting inductance, one end of output resistance is connected with one end of outputting inductance, and the other end of output resistance is as one end of this inductive load, and the other end of outputting inductance is as the other end of this inductive load.
Power switch unit comprises the first switching tube, second switch pipe, the first diode, the second diode and the second electric capacity.Wherein, the positive pole of the second electric capacity is connected with the collector electrode of the first switching tube, the negative electrode of the first diode, the emitter of the first switching tube is connected with the anode of the first diode, the negative electrode of the collector electrode of second switch pipe, the second diode, and the emitter of second switch pipe is connected with the anode of the second diode, the negative pole of the second electric capacity; The collector electrode of second switch pipe is as the first output, and the emitter of second switch pipe is as the second output.
The second output of j power switch unit of i switches set of the first brachium pontis is connected with the first output of j+1 power switch unit of i switches set of the first brachium pontis, and wherein j value is 1～n-1, and i value is 1～N+1; The second output of j power switch unit of i switches set of the second brachium pontis is connected with the first output of j+1 power switch unit of i switches set of the first brachium pontis.
Adopt phase-shifting carrier wave PWM to control the opening and turn-offing of each switching tube of each switches set of the first brachium pontis and each switches set of the second brachium pontis; J power switch unit of j power switch unit of i switches set of the first brachium pontis and i switches set of the second brachium pontis all adopts identical triangular wave as j carrier wave C j, wherein the value of j is 1～n; N carrier wave be 360 °/n of lagging phase angle successively; The end of the first brachium pontis of k I/O adopts k sinusoidal wave R of the first brachium pontis sakk direct current biasing R superposes dokobtain k modulating wave R of the first brachium pontis sak+ R dok, wherein the value of k is 1～N; The end of the second brachium pontis of k I/O adopts k sinusoidal wave R of the second brachium pontis sbkk direct current biasing R superposes dokobtain k modulating wave R of the second brachium pontis sbk+ R dok; The k of a first brachium pontis sinusoidal wave R sakk the sinusoidal wave R with the second brachium pontis sbk180 ° of phase phasic differences.
K modulating wave R of the first brachium pontis sak+ R dokwith j carrier wave C jby k comparator, as k modulating wave R of the first brachium pontis sak+ R dokbe greater than j carrier wave C jtime, k comparator output high level, as k modulating wave R of the first brachium pontis sak+ R dokbe less than j carrier wave C jtime, k comparator output low level, wherein the value of k is 1～N; The output of the 1st comparator is as the control level of the second switch pipe gate pole of j power switch unit of the 1st switches set of the first brachium pontis; The output of k-1 comparator is by k-1 not gate, the output of k-1 not gate and the output of k comparator obtain the control level of second switch pipe gate pole of j power switch unit of k switches set of the first brachium pontis by k-1 XOR gate, wherein the value of k is 2～N; The output of N comparator obtains the control level of second switch pipe gate pole of j power switch unit of N+1 switches set of the first brachium pontis by N not gate; K modulating wave R of the second brachium pontis sbk+ R dokwith j carrier wave C jby N+k comparator, as k modulating wave R of the second brachium pontis sbk+ R dokbe greater than j carrier wave C jtime, N+k comparator output high level, as k modulating wave R of the second brachium pontis sbk+ R dokbe less than j carrier wave C jtime, N+k comparator output low level, wherein the value of k is 1～N; The output of N+1 comparator is as the control level of the second switch pipe gate pole of j power switch unit of the 1st switches set of the second brachium pontis; The output of N+k-1 comparator is by N+k-1 not gate, the output of N+k-1 not gate and the output of N+k comparator obtain the control level of second switch pipe gate pole of j power switch unit of k switches set of the second brachium pontis by N-1+k-1 XOR gate, wherein the value of k is 2～N; The output of 2*N comparator obtains the control level of second switch pipe gate pole of j power switch unit of N+1 switches set of the second brachium pontis by 2*N not gate.Second switch pipe (S in each power switch unit of each switches set 2) obtain the first switching tube (S in this power switch unit after the control level of gate pole is anti-phase 1) control level of gate pole.
The mode of operation of described 2N+2 switches set MMC AC-AC converter comprises with frequently mode of operation and alien frequencies mode of operation, and with in mode of operation frequently, the frequency that N interchange inputs or outputs is identical, and amplitude is not identical; In alien frequencies mode of operation, N to exchange frequency and the amplitude input or output all different.
Compared with prior art, the advantage the utlity model has is: each input ac power is transformed into the interchange input of 2n+1 level, the interchange that is transformed into 2n+1 level through AC-AC inputs to inductive load power supply, the voltage stress that in power switch unit, each switching tube bears is only the 1/n of DC bus-bar voltage, can guarantee that the voltage that in the converter course of work, all switching tubes bear equates, has well solved the voltage-sharing of switching tube simultaneously.Compare with existing single-phase 2N+2 switch converters, the N road of 2N+2 switches set MMC AC-AC converter provided by the utility model exchanges input and is output as N road 2n+1 level, and the quality of input and output AC current waveform is greatly improved.In addition, the voltage stress bearing of each switching tube is only the 1/n of DC bus-bar voltage, and control method provided by the utility model equates the voltage that in the converter course of work, all switching tubes bear, well solved the voltage-sharing of switching tube, this will be very beneficial for the application of 2N+2 switches set MMC AC-AC converter in high pressure and large-power occasions.Compare with existing MMC converter, 2N+2 switches set MMC AC-AC converter provided by the utility model has N road and exchanges and to input or output, and can be directly used in being connected of alternating current circuit of N bar different frequency, greatly reduces engineering cost.
Accompanying drawing explanation
Fig. 1 is the circuit structure diagram of 2N+2 switches set MMC AC-AC converter of the present utility model;
Fig. 2 a, 2b are respectively the interchange output of the 2N+2 switches set MMC AC-AC converter shown in Fig. 1 and the circuit structure diagram of inductive load;
Fig. 3 is the circuit structure diagram of the power switch unit of the 2N+2 switches set MMC AC-AC converter shown in Fig. 1;
Fig. 4 a, 4b are that eight switches set MMC AC-AC converters work in respectively with the modulating wave under frequency mode of operation and alien frequencies mode of operation;
Fig. 5 a, 5b are that eight switches set nine level MMC AC-AC converters work in the simulation waveform figure with frequency mode of operation and alien frequencies mode of operation.
Embodiment
For further setting forth content of the present utility model and feature, below in conjunction with accompanying drawing, specific embodiments of the present utility model is specifically described, but enforcement of the present utility model is not limited to this.
With reference to figure 1,2N+2 switches set MMC AC-AC converter of the present utility model, comprises N I/O, the first brachium pontis, the second brachium pontis and the first capacitor C 1; The input of each I/O is all to exchange input, and the output of each I/O is all inductive loads; Described the first brachium pontis is by N+1 switches set (B 01, B 02..., B 0 (N+1)) and 2 inductance (L 01, L 02) be in series, described the second brachium pontis is by N+1 switches set (B 11, B 12..., B 1 (N+1)) and 2 inductance (L 11, L 12) be in series; I switches set B of the first brachium pontis 0iby n power switch unit (SM b0i1, SM b0i2..., SM b0in) be in series, i switches set B of the second brachium pontis 1iby n power switch unit (SM b1i1, SM b1i2..., SM b1in) be in series, wherein the value of i is 1～N+1; N>2, n is positive integer.
The 1st switches set B of the first brachium pontis 01lower end p and the first brachium pontis in the first inductance L of 2 inductance 01one end connect, the first inductance L of the first brachium pontis 01the other end and the 2nd switches set B of the first brachium pontis 02upper end o connect; I switches set B of the first brachium pontis 0ilower end and i+1 switches set B of the first brachium pontis 0 (i+1)upper end connect, wherein the value of i is 2～N-1; N switches set B of the first brachium pontis 0Nlower end and the second inductance L of the first brachium pontis 02one end connect, the second inductance L of the first brachium pontis 02the other end and N+1 switches set B of the first brachium pontis 0 (N+1)upper end connect; The circuit structure of the circuit structure of the second brachium pontis and the first brachium pontis is in full accord; The two ends of k I/O respectively with k+1 switches set B of the first brachium pontis 0 (k+1)upper end, k+1 switches set B of the second brachium pontis 1 (k+1)upper end connect, wherein the value of k is 1～N-1; The two ends of N I/O respectively with N switches set B of the first brachium pontis 0Nlower end, N switches set B of the second brachium pontis 1Nlower end connect; The 1st switches set B of the first brachium pontis 01upper end and the 1st switches set B of the second brachium pontis 11upper end, the first capacitor C 1positive pole connect, the first capacitor C 1negative pole and N switches set B of the first brachium pontis 0Nlower end, N switches set B of the second brachium pontis 1Nlower end, hold G to connect.
When k I/O inputted for exchanging, this exchanges input by alternating current input power supplying u skwith input inductance L skform alternating current input power supplying u skone end with input inductance L skone end connect, alternating current input power supplying u skthe other end as the one end that exchanges input, input inductance L skthe other end as the other end that exchanges input, as shown in Figure 2 a, wherein the value of k is 1～N; When k I/O is inductive load, this inductive load is by output resistance R lkwith outputting inductance L lkform output resistance R lkone end and outputting inductance L lkone end connect, output resistance R lkthe other end as one end of inductive load, outputting inductance L lkthe other end as the other end of inductive load, as shown in Figure 2 b.
Fig. 3 illustrates the circuit structure diagram of the power switch unit of the 2N+2 switches set MMC AC-AC converter shown in Fig. 1, and power switch unit comprises the first switching tube S 1, second switch pipe S 2, the first diode D 1, the second diode D 2with the second capacitor C sM.Wherein, the second capacitor C sMpositive pole and the first switching tube S 1collector electrode, the first diode D 1negative electrode connect, the first switching tube S 1emitter and the first diode D 1anode, second switch pipe S 2collector electrode, the second diode D 2negative electrode connect, second switch pipe S 2emitter and the second diode D 2anode, the second capacitor C sMnegative pole connect; Second switch pipe S 2collector electrode as the first output, second switch pipe S 2emitter as the second output.
As shown in Figure 1, i switches set B of the first brachium pontis 0ij power switch unit SM b0ijthe second output and i switches set B of the first brachium pontis 0ij+1 power switch unit SM b0i (j+1)the first output connect, wherein j value is 1～n-1, i value is 1～N+1; I switches set B of the second brachium pontis 1ij power switch unit SM b1ijthe second output and i switches set B of the first brachium pontis 1ij+1 power switch unit SM b1i (j+1)the first output connect.
Make k road exchange inputing or outputing into :
In formula, U c1it is the first capacitor C 1voltage.
Adopt phase-shifting carrier wave PWM to control each switches set B of the first brachium pontis 0ieach switches set B with the second brachium pontis 1ithe opening and turn-offing of each switching tube, wherein i value is 1～N+1; I switches set B of the first brachium pontis 0ij power switch unit SM b0iji the switches set B with the second brachium pontis 1ij power switch unit SM b1ijall adopt identical triangular wave as j carrier wave C j, wherein the value of j is 1～n; N carrier wave (C 1, C 2..., C n) 360 °/n of lagging phase angle successively; The end a of the first brachium pontis of k I/O kadopt k sinusoidal wave R of the first brachium pontis sakk direct current biasing R superposes dokobtain k modulating wave R of the first brachium pontis sak+ R dok, wherein the value of k is 1～N; The end b of the second brachium pontis of k I/O kadopt k sinusoidal wave R of the second brachium pontis sbkk direct current biasing R superposes dokobtain k modulating wave R of the second brachium pontis sbk+ R dok; The k of a first brachium pontis sinusoidal wave R sakk the sinusoidal wave R with the second brachium pontis sbk180 ° of phase phasic differences.
K modulating wave R of the first brachium pontis sak+ R dokwith j carrier wave C jby k comparator, as k modulating wave R of the first brachium pontis sak+ R dokbe greater than j carrier wave C jtime, k comparator output high level, as k modulating wave R of the first brachium pontis sak+ R dokbe less than j carrier wave C jtime, k comparator output low level, wherein the value of k is 1～N; The output of the 1st comparator is as the 1st switches set B of the first brachium pontis 01j power switch unit SM b01jsecond switch pipe S 2the control level S of gate pole b01j; The output of k-1 comparator is by k-1 not gate, and the output of k-1 not gate and the output of k comparator obtain k switches set B of the first brachium pontis by k-1 XOR gate 0kj power switch unit SM b0kjsecond switch pipe S 2the control level S of gate pole b0kj, wherein the value of k is 2～N; The output of N comparator obtains N+1 switches set B of the first brachium pontis by N not gate 0 (N+1)j power switch unit SM b0 (N+1) jsecond switch pipe S 2the control level S of gate pole b0 (N+1) j; K modulating wave R of the second brachium pontis sbk+ R dokwith j carrier wave C jby N+k comparator, as k modulating wave R of the second brachium pontis sbk+ R dokbe greater than j carrier wave C jtime, N+k comparator output high level, as k modulating wave R of the second brachium pontis sbk+ R dokbe less than j carrier wave C jtime, N+k comparator output low level, wherein the value of k is 1～N; The output of N+1 comparator is as the 1st switches set B of the second brachium pontis 11j power switch unit SM b11jsecond switch pipe S 2the control level S of gate pole b11j; The output of N+k-1 comparator is by N+k-1 not gate, and the output of N+k-1 not gate and the output of N+k comparator obtain k switches set B of the second brachium pontis by N-1+k-1 XOR gate 1kj power switch unit SM b1kjsecond switch pipe (S 2) the control level S of gate pole b1kj, wherein the value of k is 2～N; The output of 2*N comparator obtains N+1 switches set B of the second brachium pontis by 2*N not gate 1 (N+1)j power switch unit SM b1 (N+1) jsecond switch pipe S 2the control level S of gate pole b1 (N+1) j.Second switch pipe (S in each power switch unit of each switches set 2) obtain the first switching tube (S in this power switch unit after the control level of gate pole is anti-phase 1) control level of gate pole.
Each brachium pontis that described control method can guarantee described converter each time be carved with the output voltage u of n power switch unit sM=E, the output voltage u of N*n power switch unit sM=0, meet with u wherein b0ibe the output voltage of i switches set of the first brachium pontis, u b1ibe the output voltage of i switches set of the second brachium pontis, E is second capacitor C of each power switch unit of each switches set of the first brachium pontis and the second brachium pontis sMvoltage, and have E=U c1/ n, the voltage stress that in power switch unit, each switching tube bears is only the 1/n of DC bus-bar voltage, can guarantee that the voltage that in the converter course of work, all switching tubes bear equates, has well solved the voltage-sharing of switching tube simultaneously.
The eight switches set MMC AC-AC converters (N=3) of take are example, comprise that 2 exchange input and 1 inductive load.Fig. 4 a illustrates it and works in the 1st the modulating wave R with the first brachium pontis under frequency mode of operation sa1+ R do1, the first brachium pontis the 2nd modulating wave R sa2+ R do2, the first brachium pontis the 3rd modulating wave R sa3+ R do3with j carrier wave C jrelation.From Fig. 5 a, can find out the 1st sinusoidal wave R of the first brachium pontis sa1, the first brachium pontis the 2nd sinusoidal wave R sa2the 3rd the sinusoidal wave R with the first brachium pontis sa3frequency identical, amplitude is not identical.Fig. 4 b illustrates its 1st modulating wave R that works in the first brachium pontis under alien frequencies mode of operation sa1+ R do1, the first brachium pontis the 2nd modulating wave R sa2+ R do2, the first brachium pontis the 3rd modulating wave R sa3+ R do3with j carrier wave C jrelation.From Fig. 4 b, can find out the 1st sinusoidal wave R of the first brachium pontis sa1, the first brachium pontis the 2nd sinusoidal wave R sa2the 3rd the sinusoidal wave R with the first brachium pontis sa3frequency and amplitude all not identical.The 1st modulating wave R of the second brachium pontis sb1+ R do1, the second brachium pontis the 2nd modulating wave R sb2+ R do2, the second brachium pontis the 3rd modulating wave R sb3+ R do3with j carrier wave C jrelation and the first brachium pontis the 1st modulating wave R sa1+ R do1, the first brachium pontis the 2nd modulating wave R sa2+ R do2, the first brachium pontis the 3rd modulating wave R sa3+ R do3with j carrier wave C jrelation identical.
The eight switches set nine level MMC AC-AC converters (N=3, n=4) of take are example, comprise that 2 exchange input and 1 inductive load.Fig. 5 a, for it works in the simulation waveform figure with frequency mode of operation, is the 1st alternating current input power supplying u successively s1, the many level input us of the 1st alternating current input power supplying after changing sS1, the 2nd alternating current input power supplying u s2, the many level input us of the 2nd alternating current input power supplying after changing sS2, ac output voltage u l3, ac output current i l3, from visible the 1st the alternating current input power supplying u of Fig. 5 a s1, the 2nd alternating current input power supplying u s2export u with exchanging s3frequency identical, amplitude is not identical; Fig. 5 b is its simulation waveform figure that works in alien frequencies mode of operation, is the 1st alternating current input power supplying u successively s1, the many level input us of the 1st alternating current input power supplying after changing sS1, the 2nd alternating current input power supplying u s2, the many level input us of the 2nd alternating current input power supplying after changing sS2, ac output voltage u l3, ac output current i l3, from visible the 1st the alternating current input power supplying u of Fig. 5 b s1, the 2nd alternating current input power supplying u s2export u with exchanging s3frequency and amplitude all not identical.
Above-described embodiment is preferably execution mode of the utility model; but execution mode of the present utility model is not limited by the examples; other any do not deviate from change, the modification done under Spirit Essence of the present utility model and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection range of the present utility model.

Claims (6)

1.2N+2 switches set MMC AC-AC converter, is characterized in that: comprise N I/O, the first brachium pontis, the second brachium pontis and the first electric capacity ( c 1); Described I/O is for inputing or outputing, and input is to exchange input, and output is inductive load; Described the first brachium pontis is by N+1 switches set (B 01, B 02..., B 0 (N+1)) and 2 inductance ( l 01, l 02) be in series, described the second brachium pontis is by N+1 switches set (B 11, B 12..., B 1 (N+1)) and 2 inductance ( l 11, l 12) be in series; I switches set (B of the first brachium pontis 0i) by n power switch unit (SM b0i1, SM b0i2..., SM b0in) be in series, i switches set (B of the second brachium pontis 1i) by n power switch unit (SM b1i1, SM b1i2..., SM b1in) be in series, wherein the value of i is 1 ~ N+1; N>2, n is positive integer.
2. 2N+2 switches set MMC AC-AC converter according to claim 1, is characterized in that: two inductance of the first brachium pontis ( l 01, l 02) intercouple, form a pair of coupling inductance; Two inductance of the second brachium pontis ( l 11, l 12) intercouple, form a pair of coupling inductance.
3. 2N+2 switches set MMC AC-AC converter according to claim 1, is characterized in that: the 1st switches set (B of the first brachium pontis 01) lower end (p) and the first brachium pontis in 2 inductance the first inductance ( l 01) one end connect, the first inductance of the first brachium pontis ( l 01) the other end and the 2nd switches set (B of the first brachium pontis 02) upper end (o) connect; I switches set (B of the first brachium pontis 0i) lower end and i+1 switches set (B of the first brachium pontis 0 (i+1)) upper end connect, wherein the value of i is 2 ~ N-1; N switches set (B of the first brachium pontis 0N) lower end and the second inductance of the first brachium pontis ( l 02) one end connect, the second inductance of the first brachium pontis ( l 02) the other end and N+1 switches set (B of the first brachium pontis 0 (N+1)) upper end connect; The circuit structure of the circuit structure of the second brachium pontis and the first brachium pontis is in full accord; The two ends of k I/O respectively with k+1 switches set (B of the first brachium pontis 0 (k+1)) upper end, k+1 switches set (B of the second brachium pontis 1 (k+1)) upper end connect, wherein the value of k is 1 ~ N-1; The two ends of N I/O respectively with N switches set (B of the first brachium pontis 0N) lower end, N switches set (B of the second brachium pontis 1N) lower end connect; The 1st switches set (B of the first brachium pontis 01) upper end and the 1st switches set (B of the second brachium pontis 11) upper end, the first electric capacity ( c 1) positive pole connect, the first electric capacity ( c 1) negative pole and N switches set (B of the first brachium pontis 0N) lower end, N switches set (B of the second brachium pontis 1N) lower end, hold ( g) connect.
4. 2N+2 switches set MMC AC-AC converter according to claim 1, it is characterized in that: when k I/O inputted for exchanging, this interchange input consists of alternating current input power supplying and input inductance, one end of alternating current input power supplying is connected with one end of input inductance, the other end of alternating current input power supplying exchanges one end of input as this, the other end that the other end of input inductance exchanges input as this, wherein the value of k is 1 ~ N; When k I/O is inductive load, this inductive load consists of output resistance and outputting inductance, one end of output resistance is connected with one end of outputting inductance, and the other end of output resistance is as one end of this inductive load, and the other end of outputting inductance is as the other end of this inductive load.
5. 2N+2 switches set MMC AC-AC converter according to claim 1, is characterized in that: power switch unit comprise the first switching tube ( s 1), second switch pipe ( s 2), the first diode ( d 1), the second diode ( d 2) and the second electric capacity ( c sM ), wherein, the second electric capacity ( c sM ) positive pole and the first switching tube ( s 1) collector electrode, the first diode ( d 1) negative electrode connect, the first switching tube ( s 1) emitter and the first diode ( d 1) anode, second switch pipe ( s 2) collector electrode, the second diode ( d 2) negative electrode connect, second switch pipe ( s 2) emitter and the second diode ( d 2) anode, the second electric capacity ( c sM ) negative pole connect; Second switch pipe ( s 2) collector electrode as the first output, second switch pipe ( s 2) emitter as the second output.
6. 2N+2 switches set MMC AC-AC converter according to claim 1, is characterized in that: i switches set (B of the first brachium pontis 0i) j power switch unit (SM b0ij) the second output and i switches set (B of the first brachium pontis 0i) j+1 power switch unit (SM b0i (j+1)) the first output connect, wherein j value is 1 ~ n-1, i value is 1 ~ N+1; I switches set (B of the second brachium pontis 1i) j power switch unit (SM b1ij) the second output and i switches set (B of the first brachium pontis 1i) j+1 power switch unit (SM b1i (j+1)) the first output connect.
CN201420143757.1U 2014-03-27 2014-03-27 2N+2 switch group MMC AC-AC converter Expired - Fee Related CN203827193U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104201906A (en) * 2014-03-27 2014-12-10 华南理工大学 2N+2 switch group MMC (Modular Multilevel Converter) AC-AC (Alternating Current-Alternating Current) converter and control method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104201906A (en) * 2014-03-27 2014-12-10 华南理工大学 2N+2 switch group MMC (Modular Multilevel Converter) AC-AC (Alternating Current-Alternating Current) converter and control method thereof
CN104201906B (en) * 2014-03-27 2017-10-20 华南理工大学 2N+2 switches set MMC AC AC converters and its control method

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