CN203722498U - Double-output single-phase three-switch-group MMC rectifier - Google Patents
Double-output single-phase three-switch-group MMC rectifier Download PDFInfo
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- CN203722498U CN203722498U CN201420056551.5U CN201420056551U CN203722498U CN 203722498 U CN203722498 U CN 203722498U CN 201420056551 U CN201420056551 U CN 201420056551U CN 203722498 U CN203722498 U CN 203722498U
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Abstract
The utility model provides a double-output single-phase three-switch-group MMC rectifier. The rectifier comprises a first alternating current input power supply, a second alternating current input power supply, a first inductor, a second inductor, a switch bridge arm, a first capacitor, a second capacitor, a third capacitor and a rectification load, the switch bridge arm is formed by the serial connection of an upper switch group, a middle switch group, a lower switch group, a third inductor and a fourth inductor, the upper switch group is formed by serial connection of N power switch units, the middle switch group is formed serial connection of N power switch units, and the lower switch group is formed by serial connection of N power switch units. According to the rectifier, the carrier wave phase-shifting PWM is employed to control the rectifier, the two alternating current input power supplies are changed to two channels of the alternating current input with N+1 level, the alternating current is rectified and superposed and then supplies power for the load, the voltage stress born by each switch tube of an MMC power switch unit is merely 1/N of the voltage of a direct current power supply, the problem of voltage equalization of the switch tubes is solved, and the rectifier is applicable to occasions of input of two single-phase alternating current power supplies, high voltage and high power.
Description
Technical field
The utility model relates to module combination multi-level converter (MMC) field, is specifically related to the single-phase three switches set MMC rectifiers of a kind of dual input.
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.Single-phase three switching rectifiers have reduced a switch and corresponding drive circuit with respect to four traditional switching rectifiers, in the application of considering cost and volume, occupy certain advantage.In addition, the half that the voltage stress that in three switches, each switch bears is DC bus-bar voltage, and the voltage-sharing of three switching tubes of existence, this has limited the application of single-phase three switching rectifiers 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 rectifier 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 having advantages of traditional multi-level rectifier, module combination multi-level rectifier 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 rectifier is particularly useful for HVDC (High Voltage Direct Current) transmission system application.But, in the time of the alternating current circuit of two different frequencies connected, needing 2 MMC rectifiers, 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 the single-phase three switches set MMC rectifiers of a kind of dual input.
The technical solution adopted in the utility model is as follows.
The single-phase three switches set MMC rectifiers of dual input comprise the first alternating current input power supplying, the second alternating current input power supplying, the first inductance, the second inductance, switch brachium pontis, the first electric capacity, the second electric capacity, the 3rd electric capacity and rectification load; Described switch brachium pontis is in series by upper switches set, middle switches set, lower switches set, the 3rd inductance and the 4th inductance; Upper switches set is in series by N power switch unit, and middle switches set is in series by N power switch unit, and lower switches set is in series by N power switch unit; The two ends of the first alternating current input power supplying are inputted as the first via, and the two ends of the second alternating current input power supplying are inputted as the second tunnel.Adopt phase-shifting carrier wave PWM to control the opening and turn-offing of switching tube of upper switches set, middle switches set and lower switches set in described rectifier, N is positive integer.
In the single-phase three switches set MMC rectifiers of above-mentioned dual input, described the 3rd inductance and the 4th inductance are substituted by coupling inductance.
In the single-phase three switches set MMC rectifiers of above-mentioned dual input, in the single-phase three switches set MMC rectifiers of described dual input, the lower end of upper switches set is connected with one end of the 3rd inductance, the 3rd other end of inductance and the upper end of middle switches set are connected, the lower end of middle switches set is connected with one end of the 4th inductance, and the other end of the 4th inductance is connected with the upper end of lower switches set; The negative pole of the first electric capacity is connected with the positive pole of the second electric capacity, and the negative pole of the second electric capacity is connected with the positive pole of the 3rd electric capacity; One end of the first alternating current input power supplying is connected with the upper end of middle switches set, the other end of the first alternating current input power supplying is connected with one end of the first inductance, the other end of the first inductance is connected with the positive pole of the second electric capacity, one end of the second alternating current input power supplying is connected with the lower end of middle switches set, the other end of the second alternating current input power supplying is connected with one end of the second inductance, and the negative pole of the other end second electric capacity of the second inductance connects; The upper end of upper switches set is connected with the positive pole of the first electric capacity, one end of rectification load, the lower end of the other end of rectification load and lower switches set, the negative pole of the 3rd electric capacity, hold and be connected.
In the single-phase three switches set MMC rectifiers of above-mentioned dual input, power switch unit comprises the first switching tube, second switch pipe, the first diode, the second diode and electric capacity.Wherein, the positive pole of 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 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.
In the single-phase three switches set MMC rectifiers of above-mentioned dual input, the second output of j power switch unit of upper switches set is connected with the first output of j+1 power switch unit, and wherein j value is 1～N-1; The second output of j power switch unit of middle switches set is connected with the first output of j+1 power switch unit; The second output of j power switch unit of lower switches set is connected with the first output of j+1 power switch unit.
In the control method of the single-phase three switches set MMC rectifiers of above-mentioned dual input, in employing phase-shifting carrier wave PWM control, the switching tube of switches set, middle switches set and lower switches set opening and turn-offing; J power switch unit of upper switches set and j power switch unit of lower switches set adopt identical triangular wave as j carrier wave C
j, wherein j value is 1～N; N carrier wave 360 °/N of lagging phase angle successively; First via input adopts primary sinusoid R
athe direct current biasing that stack value is 1/3 is as the first modulating wave R
athe+1/3, second tunnel input adopts the second sinusoidal wave R
bthe direct current biasing that stack value is-1/3 is as the second modulating wave R
b-1/3.
In above-mentioned control method, the first modulating wave R
a+ 1/3 and j carrier wave C
jobtain the control level of the second switch pipe gate pole of j power switch unit of upper switches set by the first comparator, as the first modulating wave R
a+ 1/3 is greater than j carrier wave C
jtime, the first comparator output high level, as the first modulating wave R
a+ 1/3 is less than j carrier wave C
jtime, the first comparator output low level, wherein the value of j is 1～N; The second modulating wave R
b-1/3 and j carrier wave C
jobtain the control level of the second switch pipe gate pole of j power switch unit of lower switches set by the second comparator, as the second modulating wave R
b-1/3 is less than j carrier wave C
jtime, the second comparator output high level, as the second modulating wave R
b-1/3 is greater than j carrier wave C
jtime, the second comparator output low level; The control level of the control level of second switch pipe gate pole of j power switch unit of upper switches set and the second switch pipe gate pole of j power switch unit of lower switches set obtains the control level of second switch pipe gate pole in j power switch unit of middle switches set by XOR gate; In each power switch unit of each switches set, the control level of second switch pipe gate pole obtains the control level of the first switching tube gate pole of this power switch unit after anti-phase.
The mode of operation of the single-phase three switches set MMC rectifiers of dual input comprises same mode of operation and alien frequencies mode of operation frequently, and in frequency mode of operation, the frequency that first via input is inputted with the second tunnel is identical, and amplitude is not identical; In alien frequencies mode of operation, frequency and the amplitude of first via input and the input of the second tunnel are all not identical.
Compared with prior art, the advantage the utlity model has is: have two-way and exchange input, 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 rectifier course of work, all switching tubes bear equates, has well solved the voltage-sharing of switching tube simultaneously.In addition, arbitrary road input of rectifier of the present utility model is broken down does not all affect the normal work of another road input and rectifier, and fault redundance is high.Compare with existing single-phase three switching rectifiers, 2 alternating current input power supplyings of the single-phase three switches set MMC rectifiers of dual input provided by the utility model are transformed into the interchange input of 2 road N+1 level, powering load after rectification stack.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 rectifier course of work, all switching tubes bear, well solved the voltage-sharing of switching tube, this will be very beneficial for the application of the single-phase three switches set MMC rectifiers of dual input in high pressure and large-power occasions.Compare with existing MMC rectifier, the single-phase three switches set MMC rectifiers of dual input provided by the utility model have two-way exchange input, can be directly used in two different frequencies alternating current circuit be connected, greatly reduce engineering cost.
Brief description of the drawings
Fig. 1 is the circuit structure diagram of the single-phase three switches set MMC rectifiers of dual input of the present utility model;
Fig. 2 is the circuit structure diagram of the power switch unit of the single-phase three switches set MMC rectifiers of dual input of the present utility model
Fig. 3 is the structure chart of the phase-shifting carrier wave PWM control method of the single-phase three switches set MMC rectifiers of the dual input shown in Fig. 1;
Fig. 4 a, 4b are that the single-phase three switches set MMC rectifiers of the dual input shown in Fig. 1 work in respectively with frequency mode of operation and the modulating wave of alien frequencies mode of operation and the relation of carrier wave;
Fig. 5 a, 5b are that the lose-lose single-phase five level three switches set MMC rectifiers of coming in and going out work in respectively with 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, 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, the single-phase three switches set MMC rectifiers of dual input of the present utility model, comprise the first alternating current input power supplying u
a, the second alternating current input power supplying u
b, the first inductance L
a, the second inductance L
b, switch brachium pontis, the first capacitor C
1, the second capacitor C
2, the 3rd capacitor C
3with rectification load R; Described switch brachium pontis is by upper switches set H, middle switches set M, lower switches set L, the 3rd inductance L
hwith the 4th inductance L
lbe in series; Upper switches set H is by N power switch unit (SM
h1, SM
h2..., SM
hN) be in series, middle switches set M is by N power switch unit (SM
m1, SM
m2..., SM
mN) be in series, lower switches set L is by N power switch unit (SM
l1, SM
l2..., SM
lN) be in series; The first alternating current input power supplying u
atwo ends input as the first via, the second alternating current input power supplying u
btwo ends input as the second tunnel.
The lower end p of upper switches set H and the 3rd inductance L
hone end connect, the 3rd inductance L
hthe other end be connected with the upper end o of middle switches set M, the lower end of middle switches set M and the 4th inductance L
lone end connect, the 4th inductance L
lthe other end be connected with the upper end of lower switches set L; The first capacitor C
1negative pole and the second capacitor C
2positive pole connect, the second capacitor C
2negative pole and the 3rd capacitor C
3positive pole connect; The first alternating current input power supplying u
aone end be connected with the upper end of middle switches set M, the first alternating current input power supplying u
athe other end and the first inductance L
aone end connect, the first inductance L
athe other end and the second capacitor C
2positive pole connect, the second alternating current input power supplying u
bone end be connected with the lower end of middle switches set M, the second alternating current input power supplying u
bthe other end and the second inductance L
bone end connect, the second inductance L
bthe other end the second capacitor C
2negative pole connect; The upper end of upper switches set H and the first capacitor C
1one end of positive pole, rectification load R connect, the lower end of the other end of rectification load R and lower switches set L, the 3rd capacitor C
3negative pole, hold n connect.
Fig. 2 illustrates the circuit structure diagram of the power switch unit of the single-phase three switches set MMC rectifiers of the dual input 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, j the power switch unit SM of upper switches set H
hjthe second output and j+1 power switch unit SM
h (j+1)first output connect, wherein j value is 1～N-1; J the power switch unit SM of middle switches set M
mjthe second output and j+1 power switch unit SM
m (j+1)first output connect; J the power switch unit SM of lower switches set L
ljthe second output and j+1 power switch unit SM
l (j+1)first output connect.
Make first via input voltage be
the second road input voltage is
:
In formula, U
ofor output voltage.
The single-phase three switches set MMC rectifiers of dual input shown in Fig. 1 adopt phase-shifting carrier wave PWM to control, j power switch unit (SM of upper switches set (H)
hj) and j power switch unit (SM of lower switches set (L)
lj) adopt identical triangular wave as j carrier wave C
j, wherein j value is 1～N; N carrier wave (C
1, C
2..., C
n) 360 °/N of lagging phase angle successively; First via input adopts primary sinusoid R
athe direct current biasing that stack value is 1/3 is as the first modulating wave R
athe+1/3, second tunnel input adopts the second sinusoidal wave R
bthe direct current biasing that stack value is-1/3 is as the second modulating wave R
b-1/3.
As shown in Figure 3, the first modulating wave R
a+ 1/3 and j carrier wave C
jobtain j the power switch unit SM of upper switches set H by the first comparator
hjsecond switch pipe S
2the control level S of gate pole
hj, as the first modulating wave R
a+ 1/3 is greater than j carrier wave C
jtime, the first comparator A
1output high level, as the first modulating wave R
a+ 1/3 is less than j carrier wave C
jtime, the first comparator output low level, wherein the value of j is 1～N; The second modulating wave R
b-1/3 and j carrier wave C
jby the second comparator A
2obtain j the power switch unit SM of lower switches set L
ljsecond switch pipe S
2the control level S of gate pole
lj, as the second modulating wave R
b-1/3 is less than j carrier wave C
jtime, the second comparator output high level, as the second modulating wave R
b-1/3 is greater than j carrier wave C
jtime, the second comparator output low level; J the power switch unit SM of upper switches set H
hjsecond switch pipe S
2the control level S of gate pole
hjj the power switch unit SM with lower switches set L
ljsecond switch pipe S
2the control level S of gate pole
ljobtain j the power switch unit SM of middle switches set M by XOR gate
mjmiddle second switch pipe S
2the control level S of gate pole
mj; Second switch pipe S in each power switch unit of each switches set
2after the control level of gate pole is anti-phase, obtain the first switching tube S of this power switch unit
1the control level of gate pole.
Described control method can ensure described rectifier each time be carved with the output voltage U of N power switch unit
sM=E, the output voltage U of 2N power switch unit
sM=0, meet u
h+ u
m+ u
l=U
o, wherein E is capacitor C in each power switch unit
sMon voltage, and have E=U
o/ 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 rectifier course of work, all switching tubes bear equates, has well solved the voltage-sharing of switching tube simultaneously.
Fig. 4 a illustrates that the single-phase three switches set MMC rectifiers of the dual input shown in Fig. 1 work in the first modulating wave R under frequency mode of operation
a+ 1/3, the second modulating wave R
b-1/3 and j carrier wave C
jrelation.Can find out from Fig. 4 a, first via input is identical with the electric voltage frequency of the second tunnel input, and the voltage magnitude maximum of first via input and the input of the second tunnel is 2/3.Fig. 4 b illustrates that the single-phase three switches set MMC rectifiers of the dual input shown in Fig. 1 work in the first modulating wave R under alien frequencies mode of operation
a+ 1/3, the second modulating wave R
b-1/3 and j carrier wave C
jrelation.Can find out from Fig. 4 b, the electric voltage frequency of first via input and the input of the second tunnel is not identical, and the voltage magnitude of first via input and the input of the second tunnel is 1/3 to the maximum.
Fig. 5 a is that the single-phase three switches set five level MMC rectifiers (being N=4) of dual input work in the simulation waveform figure with frequency mode of operation, is the voltage u of the first alternating current input power supplying successively
a, input voltage u after the first alternating current input power supplying conversion
aa, the second alternating current input power supplying voltage u
b, input voltage u after the second alternating current input power supplying conversion
bband output voltage U
o, from the voltage u of visible the first alternating current input power supplying of Fig. 5 a
avoltage u with the second alternating current input power supplying
bfrequency identical, the voltage u of the first alternating current input power supplying
avoltage u with the second alternating current input power supplying
bcurrent amplitude not identical; Fig. 5 b is the simulation waveform figure that the single-phase three switches set five level MMC rectifiers of dual input work in alien frequencies pattern, is the voltage u of the first alternating current input power supplying successively
a, input voltage u after the first alternating current input power supplying conversion
aa, the second alternating current input power supplying voltage u
b, input voltage u after the second alternating current input power supplying conversion
bband output voltage U
o, from the voltage u of visible the first alternating current source of Fig. 5 b
avoltage u with the second alternating current source
bfrequency 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 (5)
1. the single-phase three switches set MMC rectifiers of dual input, is characterized in that: comprise the first alternating current input power supplying (
u a ), the second alternating current input power supplying (
u b ), the first inductance (
l a ), the second inductance (
l b ), switch brachium pontis, the first electric capacity (
c 1 ), the second electric capacity (
c 2 ), the 3rd electric capacity (
c 3 ) and rectification load (
r); Described switch brachium pontis by upper switches set (H), the 3rd inductance (
l h ), middle switches set (M), the 4th inductance (
l l ) and lower switches set (L) be in series; Upper switches set (H) is by N power switch unit (SM
h1, SM
h2..., SM
hN) be in series, middle switches set (M) is by N power switch unit (SM
m1, SM
m2..., SM
mN) be in series, lower switches set (L) is by N power switch unit (SM
l1, SM
l2..., SM
lN) be in series; The first alternating current input power supplying (
u a ) two ends input as the first via, the second alternating current input power supplying (
u b ) two ends input as the second tunnel; N is positive integer.
2. the single-phase three switches set MMC rectifiers of dual input according to claim 1, is characterized in that: the 3rd inductance (
l h ) and the 4th inductance (
l l ) by coupling inductance (
l h : L l ) substitute.
3. the single-phase three switches set MMC rectifiers of dual input according to claim 1, is characterized in that: the lower end of upper switches set (H) and the 3rd inductance (
l h ) one end connect, the 3rd inductance (
l h ) the other end be connected with the upper end of middle switches set (M), the lower end of middle switches set (M) and the 4th inductance (
l l ) one end connect, the 4th inductance (
l l ) the other end be connected with the upper end of lower switches set (L); The first electric capacity (
c 1 ) negative pole and the second electric capacity (
c 2 ) positive pole connect, the second electric capacity (
c 2 ) negative pole and the 3rd electric capacity (
c 3 ) positive pole connect; The first alternating current input power supplying (
u a ) one end be connected with the upper end of middle switches set (M), the first alternating current input power supplying (
u a ) the other end and the first inductance (
l a ) one end connect, the first inductance (
l a ) the other end and the second electric capacity (
c 2 ) positive pole connect, the second alternating current input power supplying (
u b ) one end be connected with the lower end of middle switches set (M), the second alternating current input power supplying (
u b ) the other end and the second inductance (
l b ) one end connect, the second inductance (
l b ) the other end the second electric capacity (
c 2 ) negative pole connect; The upper end of upper switches set (H) and the first electric capacity (
c 1 ) positive pole, rectification load (
r) one end connect, rectification load (
r) the other end and the lower end of lower switches set (L), the 3rd electric capacity (
c 3 ) negative pole, hold (
n) connect.
4. the single-phase three switches set MMC rectifiers of dual input 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 electric capacity (
c sM ); Wherein, 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, 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.
5. the single-phase three switches set MMC rectifiers of dual input according to claim 1, is characterized in that: j power switch unit (SM of upper switches set (H)
hj) the second output and j+1 power switch unit (SM
h (j+1)) first output connect, wherein j value is 1 ~ N-1; J power switch unit (SM of middle switches set (M)
mj) the second output and j+1 power switch unit (SM
m (j+1)) first output connect; J power switch unit (SM of lower switches set (L)
lj) the second output and j+1 power switch unit (SM
l (j+1)) first output connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420056551.5U CN203722498U (en) | 2014-01-28 | 2014-01-28 | Double-output single-phase three-switch-group MMC rectifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420056551.5U CN203722498U (en) | 2014-01-28 | 2014-01-28 | Double-output single-phase three-switch-group MMC rectifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203722498U true CN203722498U (en) | 2014-07-16 |
Family
ID=51161621
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420056551.5U Expired - Fee Related CN203722498U (en) | 2014-01-28 | 2014-01-28 | Double-output single-phase three-switch-group MMC rectifier |
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| Country | Link |
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| CN (1) | CN203722498U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103986353A (en) * | 2014-01-28 | 2014-08-13 | 华南理工大学 | Double-input single-phase three-switch group MMC rectifier and control method thereof |
-
2014
- 2014-01-28 CN CN201420056551.5U patent/CN203722498U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103986353A (en) * | 2014-01-28 | 2014-08-13 | 华南理工大学 | Double-input single-phase three-switch group MMC rectifier and control method thereof |
| CN103986353B (en) * | 2014-01-28 | 2016-10-05 | 华南理工大学 | The single-phase three switches set MMC rectifier of dual input and control method thereof |
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