CN203827191U - 3N+3 switch group MMC AC-AC converter - Google Patents
3N+3 switch group MMC AC-AC converter Download PDFInfo
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- CN203827191U CN203827191U CN201420144429.3U CN201420144429U CN203827191U CN 203827191 U CN203827191 U CN 203827191U CN 201420144429 U CN201420144429 U CN 201420144429U CN 203827191 U CN203827191 U CN 203827191U
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- brachium pontis
- switches set
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- cross streams
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Abstract
The utility model provides a 3N+3 switch group modular multilevel converter (MMC) AC-AC converter comprising N three-phase alternating-current input/output units, a first bridge arm, a second bridge arm, a third bridge arm and a capacitor. Each of the first bridge arm, the second bridge arm, and the third bridge arm are 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. Three terminals of each three-phase inductive load serve as three-phase alternating-current outputs. 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 three-phase alternating-current output is converted into the alternating-current input whose line voltage is at the 2n+1 level; after AC-AC conversion, the alternating-current output with the line voltage at the 2n+1 level is obtained and is used for power supplying of loads. 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. A voltage sharing problem of the switch tube can be solved. The provided converter can be applied to the high-voltage and high-power occasions.
Description
Technical field
The utility model relates to module combination multi-level converter (MMC) field, is specifically related to a kind of 3N+3 switches set MMC AC-AC converter.
Background technology
, under this trend, there is the direction of two kinds of improvement rectifiers: reduce passive device or improve rectifier topology structure to reduce active device as the new development that reduces active device direction at present power rectifier forward miniaturization, high reliability and low-loss future development.Three-phase 3N+3 switch AC-AC converter has reduced 3N-3 switch and corresponding drive circuit with respect to traditional 6N switch converters, in the application of considering cost and volume, occupies certain advantage.But 3N+3 switch AC-AC converter Mei road input and output are three level, input and output AC wave shape is poor.In addition, the half that the voltage stress that in 3N+3 switch, each switch bears is DC bus-bar voltage, and there is the voltage-sharing of 3N+3 switching tube, this has limited the application of three-phase 3N+3 switch AC-AC converter in high pressure and large-power occasions greatly.
In recent years, multilevel technology is constantly promoted, and successful Application is at the industrial circle such as 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 topology, except thering is 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.But, in the time of the three-phase AC line 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 3N+3 switches set MMC AC-AC converter.
The technical solution adopted in the utility model is: 3N+3 switches set MMC AC-AC converter comprises N three-phase alternating current I/O, the first brachium pontis, the second brachium pontis, the 3rd brachium pontis and the first electric capacity; Described three-phase alternating current I/O is three-phase alternating current input or three-phase alternating current output, and three-phase alternating current is output as three-phase 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, and described the 3rd 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, i switches set of the second brachium pontis is in series by n power switch unit, i switches set of the 3rd 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; Two inductance of the 3rd brachium pontis intercouple, and form a pair of coupling inductance.
In the time that k three-phase alternating current I/O is three-phase alternating current input, this three-phase alternating current input comprises u cross streams input power, v cross streams input power, w cross streams input power, u cross streams outputting inductance, v cross streams outputting inductance and w cross streams outputting inductance, one end of u cross streams input power and v cross streams input power, w cross streams input power connects, the other end of u cross streams input power is connected with one end of u cross streams outputting inductance, the other end of u cross streams input inductance is as the end of this three-phase alternating current input, the other end of v cross streams input power is connected with one end of v cross streams outputting inductance, the other end of v cross streams input inductance is as the end of this three-phase alternating current input, the other end of w cross streams input power is connected with one end of w cross streams outputting inductance, the other end of w cross streams input inductance is as the end of this three-phase alternating current input, wherein the value of k is 1~N, in the time that k three-phase alternating current I/O is three-phase inductive load, this three-phase inductive load comprises u phase resistance, v phase resistance, w phase resistance, u cross streams outputting inductance, v cross streams outputting inductance and w cross streams outputting inductance, one end of one end of u phase resistance and v phase resistance, one end of w phase resistance connects, the other end of u phase resistance is connected with one end of u cross streams outputting inductance, the other end of u cross streams outputting inductance is as the end of this three-phase inductive load, the other end of v phase resistance is connected with one end of v cross streams outputting inductance, the other end of v cross streams outputting inductance is as the end of this three-phase inductive load, the other end of w phase resistance is connected with one end of w cross streams outputting inductance, the other end of w cross streams outputting inductance is as the end of this three-phase inductive load.
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, the circuit structure of the 3rd brachium pontis and the first brachium pontis is in full accord; Three ends of k three-phase alternating current I/O are connected with the upper end of k+1 switches set of the upper end of k+1 switches set of the upper end of k+1 switches set of the first brachium pontis, the second brachium pontis, the 3rd brachium pontis respectively, and wherein the value of k is 1~N-1; Three ends of N three-phase alternating current I/O are connected with the lower end of N+1 switches set of the lower end of N+1 switches set of the first brachium pontis, the second brachium pontis, the lower end of N+1 switches set of the 3rd brachium pontis connects; The upper end of the upper end of the upper end of the 1st switches set of the first brachium pontis and the 1st switches set of the second brachium pontis, the 1st switches set of the 3rd brachium pontis, the positive pole of the first electric capacity are connected, the lower end of the lower end of the lower end of the negative pole of the first electric capacity and N+1 switches set of the first brachium pontis, N+1 switches set of the second brachium pontis, N+1 switches set of the 3rd brachium pontis, hold and be connected.
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 collector electrode of second switch pipe, the negative electrode of 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 second brachium pontis; The second output of j power switch unit of i switches set of the 3rd brachium pontis is connected with the first output of j+1 power switch unit of i switches set of the 3rd brachium pontis.
Adopt phase-shifting carrier wave PWM to control opening and turn-offing of each switching tube; J power switch unit of j power switch unit of j power switch unit of i switches set of the first brachium pontis, i switches set of the second brachium pontis and i switches set of the 3rd brachium pontis all adopts identical triangular wave as j carrier wave C
j, wherein the value of j is 1~n; N carrier wave 360 °/n of lagging phase angle successively; The end of the first brachium pontis of k three-phase alternating current I/O adopts k sinusoidal wave R of the first brachium pontis
sukk direct current biasing R superposes
dokobtain k modulating wave R of the first brachium pontis
suk+ R
dok, wherein the value of k is 1~N; The end of the second brachium pontis of k three-phase alternating current I/O adopts k sinusoidal wave R of the second brachium pontis
svkk direct current biasing R superposes
dokobtain k modulating wave R of the second brachium pontis
svk+ R
dok; The end of the 3rd brachium pontis of k three-phase alternating current I/O adopts k sinusoidal wave R of the 3rd brachium pontis
swkk direct current biasing R superposes
dokobtain k modulating wave R of the 3rd brachium pontis
swk+ R
dok; The k of a first brachium pontis sinusoidal wave R
suk, the second brachium pontis k sinusoidal wave R
svkk the sinusoidal wave R with the 3rd brachium pontis
swkphase place differs 120 ° successively.
K modulating wave R of the first brachium pontis
suk+ R
dokwith j carrier wave C
jby k comparator, as k modulating wave R of the first brachium pontis
suk+ R
dokbe greater than j carrier wave C
jtime, k comparator output high level, as k modulating wave R of the first brachium pontis
suk+ 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 the 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 the 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
svk+ R
dokwith j carrier wave C
jby N+k comparator, as k modulating wave R of the second brachium pontis
svk+ 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
svk+ 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 the 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 the 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; K modulating wave R of the 3rd brachium pontis
swk+ R
dokwith j carrier wave C
jby 2*N+k comparator, as k modulating wave R of the 3rd brachium pontis
swk+ R
dokbe greater than j carrier wave C
jtime, 2*N+k comparator output high level, as k modulating wave R of the 3rd brachium pontis
swk+ R
dokbe less than j carrier wave C
jtime, 2*N+k comparator output low level, wherein the value of k is 1~N; The output of 2*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 3rd brachium pontis; The output of 2*N+k-1 comparator is by 2*N+k-1 not gate, the output of 2*N+k-1 not gate and the output of 2*N+k comparator obtain the control level of the second switch pipe gate pole of j power switch unit of k switches set of the 3rd brachium pontis by 2* (N-1)+k-1 XOR gate, wherein the value of k is 2~N; The output of 3*N comparator obtains the control level of the second switch pipe gate pole of j power switch unit of N+1 switches set of the 3rd brachium pontis by 3*N not gate.
The mode of operation of 3N+3 switches set MMC AC-AC converter comprises same mode of operation and alien frequencies mode of operation frequently, and in frequency mode of operation, the frequency that the input of N road three-phase alternating current or three-phase alternating current are exported is identical, and amplitude is not identical; In alien frequencies mode of operation, frequency and the amplitude of the input of N road three-phase alternating current or three-phase alternating current output are all different.
Compared with prior art, the advantage the utlity model has is: every road exchanges input and is all converted to the interchange input that line voltage is 2n+1 level, being transformed into line voltage through AC-AC is that load supplying is exported in the interchange of 2n+1 level, the voltage stress that in power switch unit, each switching tube bears is only the 1/n of DC bus-bar voltage, can ensure 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 three-phase 3N+3 switch AC-AC converter, the N road three-phase alternating current input of 3N+3 switches set MMC AC-AC converter provided by the utility model or the line voltage of three-phase alternating current output are 2n+1 level, and the voltage stress bearing of each switching tube is only the 1/n of DC bus-bar voltage, well solved the voltage-sharing of switching tube, this will be very beneficial for the application of 3N+3 switches set MMC AC-AC converter in high pressure and large-power occasions.Compare with existing MMC converter, 3N+3 switches set MMC AC-AC converter provided by the utility model has the three-phase alternating current input of N road or three-phase alternating current output, can be directly used in N bar different frequency three-phase AC line be connected, greatly reduce engineering cost.
Brief description of the drawings
Fig. 1 is the circuit structure diagram of 3N+3 switches set MMC AC-AC converter of the present utility model;
Fig. 2 a, 2b are respectively the three-phase alternating current input of the 3N+3 switches set MMC AC-AC converter shown in Fig. 1 and the circuit structure diagram of three-phase inductive load;
Fig. 3 is the circuit structure diagram of the switch power unit of the 3N+3 switches set MMC AC-AC converter shown in Fig. 1;
Fig. 4 a, Fig. 4 b are two phase-shifting carrier wave PWM control structure figure of the 3N+3 switches set MMC AC-AC converter shown in Fig. 1;
Fig. 5 a, 5b are that twelvemo pass group MMC AC-AC converter works in respectively with the modulating wave under frequency mode of operation and alien frequencies mode of operation;
Fig. 6 a, 6b are that twelvemo pass is organized nine level MMC AC-AC converters and worked in the simulation waveform figure of mode of operation and alien frequencies mode of operation frequently.
Embodiment
For further setting forth content of the present utility model and feature, below in conjunction with accompanying drawing, embodiment of the present utility model is specifically described, but enforcement of the present utility model is not limited to this.
With reference to figure 1,3N+3 switches set MMC AC-AC converter of the present utility model, comprises N three-phase alternating current I/O, the first brachium pontis, the second brachium pontis, the 3rd brachium pontis and the first capacitor C
1; Described the first brachium pontis is by N+1 switches set (B
u1, B
u2..., B
u (N+1)) and 2 inductance (L
u1, L
u2) be in series, described the second brachium pontis is by N+1 switches set (B
v1, B
v2..., B
v (N+1)) and 2 inductance (L
v1, L
v2) be in series, described the 3rd brachium pontis is by N+1 switches set (B
w1, B
w2..., B
w (N+1)) and 2 inductance (L
w1, L
w2) be in series; I switches set B of the first brachium pontis
uiby n power switch unit (SM
bui1, SM
bui2..., SM
buin) be in series, i switches set B of the second brachium pontis
viby n power switch unit (SM
bvi1, SM
bvi2..., SM
bvin) be in series, i switches set B of the 3rd brachium pontis
wiby n power switch unit (SM
bwi1, SM
bwi2..., SM
bwin) be in series, wherein the value of i is 1~N+1; Three ends of each three-phase inductive load are exported as each three-phase alternating current; N>2, n is positive integer.
The 1st switches set B of the first brachium pontis
u1lower end p and the first brachium pontis in the first inductance L of 2 inductance
u1one end connect, the first inductance L of the first brachium pontis
u1the other end and the 2nd switches set B of the first brachium pontis
u2upper end o connect; I switches set B of the first brachium pontis
uilower end and i+1 switches set (B of the first brachium pontis
u (i+1)) upper end connect, wherein the value of i is 2~N-1; N switches set B of the first brachium pontis
uNlower end and the second inductance L of the first brachium pontis
u2one end connect, the second inductance L of the first brachium pontis
u2the other end and N+1 switches set B of the first brachium pontis
u (N+1)upper end connect; The circuit structure of the circuit structure of the second brachium pontis, the circuit structure of the 3rd brachium pontis and the first brachium pontis is in full accord; Three ends of k three-phase alternating current I/O respectively with k+1 switches set B of the first brachium pontis
u (k+1)upper end, k+1 switches set B of the second brachium pontis
v (k+1)upper end, k+1 switches set B of the 3rd brachium pontis
w (k+1)upper end connect, wherein the value of k is 1~N-1; Three ends of N three-phase alternating current I/O and N+1 switches set B of the first brachium pontis
u (N+1)lower end, N+1 switches set B of the second brachium pontis
v (N+1)lower end connect, N+1 switches set B of the 3rd brachium pontis
w (N+1)lower end connect; The 1st switches set B of the first brachium pontis
u1upper end and the 1st switches set B of the second brachium pontis
v1upper end, the 1st switches set B of the 3rd brachium pontis
w1upper end, the first capacitor C
1positive pole connect, the first capacitor C
1negative pole and N+1 switches set B of the first brachium pontis
u (N+1)lower end, N+1 switches set B of the second brachium pontis
v (N+1)lower end, N+1 switches set B of the 3rd brachium pontis
w (N+1)lower end, hold G connect.
In the time that k three-phase alternating current I/O is three-phase alternating current input, this three-phase alternating current input comprises u cross streams input power u
uk, v cross streams input power u
vk, w cross streams input power u
wk, u cross streams outputting inductance L
iuk, v cross streams outputting inductance L
ivkwith w cross streams outputting inductance L
iwk, u cross streams input power u
ukone end and v cross streams input power u
vk, w cross streams input power u
wkconnect u cross streams input power u
ukthe other end and u cross streams outputting inductance L
iukone end connect, u cross streams input inductance L
iukthe other end as the end a of this three-phase alternating current input
uk, v cross streams input power v
vkthe other end and v cross streams outputting inductance L
ivkone end connect, v cross streams input inductance L
ivkthe other end as the end a of this three-phase alternating current input
vk, w cross streams input power w
wkthe other end and w cross streams outputting inductance L
iwkone end connect, w cross streams input inductance L
iwkthe other end as the end a of this three-phase alternating current input
wk, as shown in Figure 2 a, wherein the value of k is 1~N; In the time that k three-phase alternating current I/O is three-phase inductive load, this three-phase inductive load comprises u phase resistance R
uk, v phase resistance R
vk, w phase resistance R
wk, u cross streams outputting inductance L
ouk, v cross streams outputting inductance L
ovkwith w cross streams outputting inductance L
owk, u phase resistance R
ukone end and v phase resistance R
vkone end, w phase resistance R
wkone end connect, u phase resistance R
ukthe other end and u cross streams outputting inductance L
oukone end connect, u cross streams outputting inductance L
oukthe other end as the end a of this three-phase inductive load
uk, v phase resistance R
vkthe other end and v cross streams outputting inductance L
ovkone end connect, v cross streams outputting inductance L
ovkthe other end as the end a of this three-phase inductive load
vk, w phase resistance R
wkthe other end and w cross streams outputting inductance L
owkone end connect, w cross streams outputting inductance L
owkthe other end as the end a of this three-phase inductive load
wk, as shown in Figure 2 b.
Fig. 3 illustrates the circuit structure diagram of the switch power unit of the 3N+3 switches set MMC AC-AC converter shown in Fig. 1.Power switch unit comprises the first switching tube S
1, second switch pipe S
2, the first diode D
1, the second diode D
2and capacitor C
sM.Wherein, 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, 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
uij power switch unit SM
buijthe second output and i switches set B of the first brachium pontis
uij+1 power switch unit SM
bui (j+1)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
vij power switch unit SM
bvijthe second output and i switches set B of the second brachium pontis
vij+1 power switch unit SM
bvi (j+1)first output connect; I switches set B of the 3rd brachium pontis
vij power switch unit SM
bvijthe second output and i switches set B of the 3rd brachium pontis
vij+1 power switch unit SM
bvi (j+1)first output connect.
Make the u phase voltage source of k three-phase alternating current input or three-phase alternating current output be
the v phase voltage source of the input of k three-phase alternating current or three-phase alternating current output is
the w phase voltage source of the input of k three-phase alternating current or three-phase alternating current output is
:
In formula, U
c1it is the first capacitor C
1voltage.
3N+3 switches set MMC AC-AC converter using phase-shifting carrier wave PWM shown in Fig. 1 controls, as shown in Fig. 4 a~Fig. 4 b.
Adopt phase-shifting carrier wave PWM to control each switches set B of the first brachium pontis
ui, the second brachium pontis each switches set B
vieach switches set B with the 3rd brachium pontis
withe opening and turn-offing of each switching tube, wherein i value is 1~N+1; I switches set B of the first brachium pontis
uij power switch unit SM
buij, the second brachium pontis i switches set B
vij power switch unit SM
bviji the switches set B with the 3rd brachium pontis
wij power switch unit SM
bwijall 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 three-phase alternating current I/O
ukadopt k sinusoidal wave R of the first brachium pontis
sukk direct current biasing R superposes
dokobtain k modulating wave R of the first brachium pontis
suk+ R
dok, wherein the value of k is 1~N; The end a of the second brachium pontis of k three-phase alternating current I/O
vkadopt k sinusoidal wave R of the second brachium pontis
svkk direct current biasing R superposes
dokobtain k modulating wave R of the second brachium pontis
svk+ R
dok; The end a of the 3rd brachium pontis of k three-phase alternating current I/O
wkadopt k sinusoidal wave R of the 3rd brachium pontis
swkk direct current biasing R superposes
dokobtain k modulating wave R of the 3rd brachium pontis
swk+ R
dok; The k of a first brachium pontis sinusoidal wave R
suk, the second brachium pontis k sinusoidal wave R
svkk the sinusoidal wave R with the 3rd brachium pontis
swkphase place differs 120 ° successively.
K modulating wave R of the first brachium pontis
suk+ R
dokwith j carrier wave C
jby k comparator, as k modulating wave R of the first brachium pontis
suk+ R
dokbe greater than j carrier wave C
jtime, k comparator output high level, as k modulating wave R of the first brachium pontis
suk+ 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
u1j power switch unit SM
bu1jsecond switch pipe S
2the control level S of gate pole
bu1j; 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
ukj power switch unit SM
bukjsecond switch pipe S
2the control level S of gate pole
bukj, 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
u (N+1)j power switch unit SM
bu (N+1) jsecond switch pipe S
2the control level S of gate pole
bu (N+1) j; K modulating wave R of the second brachium pontis
svk+ R
dokwith j carrier wave C
jby N+k comparator, as k modulating wave R of the second brachium pontis
svk+ 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
svk+ 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
v1j power switch unit SM
bv1jsecond switch pipe S
2the control level S of gate pole
bv1j; 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
vkj power switch unit SM
bvkjthe control level S of second switch pipe S2 gate pole
bvkj, 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
v (N+1)j power switch unit SM
bv (N+1) jsecond switch pipe S
2the control level S of gate pole
bv (N+1) j; K modulating wave R of the 3rd brachium pontis
swk+ R
dokwith j carrier wave C
jby 2*N+k comparator, as k modulating wave R of the 3rd brachium pontis
swk+ R
dokbe greater than j carrier wave C
jtime, 2*N+k comparator output high level, as k modulating wave R of the 3rd brachium pontis
swk+ R
dokbe less than j carrier wave C
jtime, 2*N+k comparator output low level, wherein the value of k is 1~N; The output of 2*N+1 comparator is as the 1st switches set B of the 3rd brachium pontis
w1j power switch unit SM
bw1jsecond switch pipe S
2the control level S of gate pole
bw1j; The output of 2*N+k-1 comparator is by 2*N+k-1 not gate, and the output of 2*N+k-1 not gate and the output of 2*N+k comparator obtain k switches set B of the 3rd brachium pontis by 2* (N-1)+k-1 XOR gate
wkj power switch unit SM
bwkjsecond switch pipe S
2the control level S of gate pole
bwkj, wherein the value of k is 2~N; The output of 3*N comparator obtains N+1 switches set B of the 3rd brachium pontis by 3*N not gate
w (N+1)j power switch unit SM
bw (N+1) jsecond switch pipe S
2the control level S of gate pole
bw (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 ensure 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
Wherein u
buibe the output voltage of i switches set of the first brachium pontis, u
bvibe the output voltage of i switches set of the second brachium pontis, u
bwibe the output voltage of i switches set of the 3rd brachium pontis, E is the second capacitor C in each power switch unit
sMon voltage, 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 ensure 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.
Taking twelvemo pass group MMC AC-AC converter (N=3) as example, comprise two three-phase alternating current inputs and a three-phase alternating current output, Fig. 5 a illustrates that it works in the 1st the modulating wave R with the first brachium pontis under frequency mode of operation
su1+ R
do1, the first brachium pontis the 2nd modulating wave R
su2+ R
do2, the first brachium pontis the 3rd modulating wave R
su3+ R
do3with j carrier wave C
jrelation.Can find out the 1st sinusoidal wave R of the first brachium pontis from Fig. 5 a
su1, the first brachium pontis the 2nd sinusoidal wave R
su2the 3rd the sinusoidal wave R with the first brachium pontis
su3frequency identical, amplitude is not identical.Fig. 5 b illustrates that it works in the 1st modulating wave R of the first brachium pontis under alien frequencies mode of operation
su1+ R
do1, the first brachium pontis the 2nd modulating wave R
su2+ R
do2, the first brachium pontis the 3rd modulating wave R
su3+ R
do3with j carrier wave C
jrelation.Can find out the 1st sinusoidal wave R of the first brachium pontis from Fig. 5 b
su1, the first brachium pontis the 2nd sinusoidal wave R
su2the 3rd the sinusoidal wave R with the first brachium pontis
su3frequency and amplitude all not identical.The 1st modulating wave R of the second brachium pontis
sv1+ R
do1, the second brachium pontis the 2nd modulating wave R
sv2+ R
do2, the second brachium pontis the 3rd modulating wave R
sv3+ R
do3with j carrier wave C
jrelation and the 1st modulating wave R of the first brachium pontis
su1+ R
do1, the first brachium pontis the 2nd modulating wave R
su2+ R
do2, the first brachium pontis the 3rd modulating wave R
su3+ R
do3with j carrier wave C
jrelation identical; The 1st modulating wave R of the 3rd brachium pontis
sw1+ R
do1, the 3rd brachium pontis the 2nd modulating wave R
sw2+ R
do2, the 3rd brachium pontis the 3rd modulating wave R
sw3+ R
do3with j carrier wave C
jrelation and the first brachium pontis the 1st modulating wave R
su1+ R
do1, the first brachium pontis the 2nd modulating wave R
su2+ R
do2, the first brachium pontis the 3rd modulating wave R
su3+ R
do3with j carrier wave C
jrelation identical.
Organize nine level MMC AC-AC converters (N=3, n=4) taking twelvemo pass as example, comprise two three-phase alternating current inputs and a three-phase alternating current output.Fig. 6 a is that it works in the simulation waveform figure with frequency mode of operation, is 3 phase voltage (u of the 1st three-phase alternating current input successively
su1, u
sv1, u
sw1), 3 line voltage (u after the 1st three-phase alternating current input conversion
suv1, u
svw1, u
swu1), 3 phase voltage (u of the 2nd three-phase alternating current input
su2, u
sv2, u
sw2), 3 line voltage (u after the 2nd three-phase alternating current input conversion
suv2, u
svw2, u
swu2), 3 line voltage (u of three-phase alternating current output
luv3, u
lvw3, u
lwu3), 3 line current (i of three-phase alternating current output
lu3, i
lv3, i
lw3), identical with the frequency of three-phase alternating current output from visible the 1st three-phase alternating current input of Fig. 6 a, the 2nd three-phase alternating current input, amplitude is not identical; Fig. 6 b is its simulation waveform figure that works in alien frequencies mode of operation, is 3 phase voltage (u of the 1st three-phase alternating current input successively
su1, u
sv1, u
sw1), 3 line voltage (u after the 1st three-phase alternating current input conversion
suv1, u
svw1, u
swu1), 3 phase voltage (u of the 2nd three-phase alternating current input
su2, u
sv2, u
sw2), 3 line voltage (u after the 2nd three-phase alternating current input conversion
suv2, u
svw2, u
swu2), 3 line voltage (u of three-phase alternating current output
luv3, u
lvw3, u
lwu3), 3 line current (i of three-phase alternating current output
lu3, i
lv3, i
lw3), input all not identical with frequency and the amplitude of three-phase alternating current output from visible the 1st the three-phase alternating current input of Fig. 6 a, the 2nd three-phase alternating current.
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)
1.3N+3 switches set MMC AC-AC converter, is characterized in that: comprise N three-phase alternating current I/O, the first brachium pontis, the second brachium pontis, the 3rd brachium pontis and the first electric capacity (
c 1); Described three-phase alternating current I/O is three-phase alternating current input or three-phase alternating current output, and three-phase alternating current is output as three-phase inductive load; Described the first brachium pontis is by N+1 switches set (B
u1, B
u2..., B
u (N+1)) and 2 inductance (
l u1
,
l u2
) be in series, described the second brachium pontis is by N+1 switches set (B
v1, B
v2..., B
v (N+1)) and 2 inductance (
l v1
,
l v2
) be in series, described the 3rd brachium pontis is by N+1 switches set (B
w1, B
w2..., B
w (N+1)) and 2 inductance (
l w1
,
l w2
) be in series; I switches set (B of the first brachium pontis
ui) by n power switch unit (SM
bui1, SM
bui2..., SM
buin) be in series, i switches set (B of the second brachium pontis
vi) by n power switch unit (SM
bvi1, SM
bvi2..., SM
bvin) be in series, i switches set (B of the 3rd brachium pontis
wi) by n power switch unit (SM
bwi1, SM
bwi2..., SM
bwin) be in series, wherein the value of i is 1 ~ N+1; N>2, n is positive integer.
2. 3N+3 switches set MMC AC-AC converter according to claim 1, is characterized in that: two inductance of the first brachium pontis (
l u1
,
l u2
) intercouple, form a pair of coupling inductance; Two inductance of the second brachium pontis (
l v1
,
l v2
) intercouple, form a pair of coupling inductance; Two inductance of the 3rd brachium pontis (
l w1
,
l w2
) intercouple, form a pair of coupling inductance.
3. 3N+3 switches set MMC AC-AC converter according to claim 1, is characterized in that: the 1st switches set (B of the first brachium pontis
u1) lower end (p) and the first brachium pontis in 2 inductance the first inductance (
l u1
) one end connect, the first inductance of the first brachium pontis (
l u1
) the other end and the 2nd switches set (B of the first brachium pontis
u2) upper end (o) connect; I switches set (B of the first brachium pontis
ui) lower end and i+1 switches set (B of the first brachium pontis
u (i+1)) upper end connect, wherein the value of i is 2 ~ N-1; N switches set (B of the first brachium pontis
uN) lower end and the second inductance of the first brachium pontis (
l u2 ) one end connect, the second inductance of the first brachium pontis (
l u2 ) the other end and N+1 switches set (B of the first brachium pontis
u (N+1)) upper end connect; The circuit structure of the circuit structure of the second brachium pontis, the circuit structure of the 3rd brachium pontis and the first brachium pontis is in full accord; Three ends of k three-phase alternating current I/O respectively with k+1 switches set (B of the first brachium pontis
u (k+1)) upper end, k+1 switches set (B of the second brachium pontis
v (k+1)) upper end, k+1 switches set (B of the 3rd brachium pontis
w (k+1)) upper end connect, wherein the value of k is 1 ~ N-1; Three ends of N three-phase alternating current I/O and N+1 switches set (B of the first brachium pontis
u (N+1)) lower end, N+1 switches set (B of the second brachium pontis
v (N+1)) lower end connect, N+1 switches set (B of the 3rd brachium pontis
w (N+1)) lower end connect; The 1st switches set (B of the first brachium pontis
u1) upper end and the 1st switches set (B of the second brachium pontis
v1) upper end, the 1st switches set (B of the 3rd brachium pontis
w1) upper end, the first electric capacity (
c 1) positive pole connect, the first electric capacity (
c 1) negative pole and N+1 switches set (B of the first brachium pontis
u (N+1)) lower end, N+1 switches set (B of the second brachium pontis
v (N+1)) lower end, N+1 switches set (B of the 3rd brachium pontis
w (N+1)) lower end, hold (
g) connect.
4. 3N+3 switches set MMC AC-AC converter according to claim 1, is characterized in that: when k three-phase alternating current I/O is three-phase alternating current when input, this three-phase alternating current input comprise u cross streams input power (
u uk ), v cross streams input power (
u vk ), w cross streams input power (
u wk ), u cross streams outputting inductance (
l iuk ), v cross streams outputting inductance (
l ivk ) and w cross streams outputting inductance (
l iwk ), u cross streams input power (
u uk ) one end and v cross streams input power (
u vk ), w cross streams input power (
u wk ) connect, u cross streams input power (
u uk ) the other end and u cross streams outputting inductance (
l iuk ) one end connect, u cross streams input inductance (
l iuk ) the other end as the end of this three-phase alternating current input (
a uk ), v cross streams input power (
v vk ) the other end and v cross streams outputting inductance (
l ivk ) one end connect, v cross streams input inductance (
l ivk ) the other end as the end of this three-phase alternating current input (
a vk ), w cross streams input power (
w wk ) the other end and w cross streams outputting inductance (
l iwk ) one end connect, w cross streams input inductance (
l iwk ) the other end as the end of this three-phase alternating current input (
a wk ), wherein the value of k is 1 ~ N; In the time that k three-phase alternating current I/O is three-phase inductive load, this three-phase inductive load comprise u phase resistance (
r uk ), v phase resistance (
r vk ), w phase resistance (
r wk ), u cross streams outputting inductance (
l ouk ), v cross streams outputting inductance (
l ovk ) and w cross streams outputting inductance (
l owk ), u phase resistance (
r uk ) one end and v phase resistance (
r vk ) one end, w phase resistance (
r wk ) one end connect, u phase resistance (
r uk ) the other end and u cross streams outputting inductance (
l ouk ) one end connect, u cross streams outputting inductance (
l ouk ) the other end as the end of this three-phase inductive load (
a uk ), v phase resistance (
r vk ) the other end and v cross streams outputting inductance (
l ovk ) one end connect, v cross streams outputting inductance (
l ovk ) the other end as the end of this three-phase inductive load (
a vk ), w phase resistance (
r wk ) the other end and w cross streams outputting inductance (
l owk ) one end connect, w cross streams outputting inductance (
l owk ) the other end as the end of this three-phase inductive load (
a wk ).
5. 3N+3 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. 3N+3 switches set MMC AC-AC converter according to claim 1, is characterized in that: i switches set (B of the first brachium pontis
ui) j power switch unit (SM
buij) the second output and i switches set (B of the first brachium pontis
ui) j+1 power switch unit (SM
bui (j+1)) 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
vi) j power switch unit (SM
bvij) the second output and i switches set (B of the second brachium pontis
vi) j+1 power switch unit (SM
bvi (j+1)) first output connect; I switches set (B of the 3rd brachium pontis
vi) j power switch unit (SM
bvij) the second output and i switches set (B of the 3rd brachium pontis
vi) j+1 power switch unit (SM
bvi (j+1)) first output connect.
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CN201420144429.3U CN203827191U (en) | 2014-03-27 | 2014-03-27 | 3N+3 switch group MMC AC-AC converter |
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Application Number | Priority Date | Filing Date | Title |
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CN201420144429.3U CN203827191U (en) | 2014-03-27 | 2014-03-27 | 3N+3 switch group MMC AC-AC converter |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104218819A (en) * | 2014-03-27 | 2014-12-17 | 华南理工大学 | 3N+3 switch set MMC AC-AC converter and control method thereof |
CN107612341A (en) * | 2017-09-21 | 2018-01-19 | 武汉大学 | Multiport based on 3N+3 switch cascades can present type high tension transformer and control method |
-
2014
- 2014-03-27 CN CN201420144429.3U patent/CN203827191U/en not_active Expired - Fee Related
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104218819A (en) * | 2014-03-27 | 2014-12-17 | 华南理工大学 | 3N+3 switch set MMC AC-AC converter and control method thereof |
CN104218819B (en) * | 2014-03-27 | 2018-09-14 | 华南理工大学 | 3N+3 switching groups MMC AC-AC converters and its control method |
CN107612341A (en) * | 2017-09-21 | 2018-01-19 | 武汉大学 | Multiport based on 3N+3 switch cascades can present type high tension transformer and control method |
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