CN103762879A - Dual-output single-phase three-switch-group MMC inverter without direct current bias and control method thereof - Google Patents
Dual-output single-phase three-switch-group MMC inverter without direct current bias and control method thereof Download PDFInfo
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Abstract
The invention provides a dual-output single-phase three-switch-group MMC inverter without direct current bias and a control method of the inverter. The inverter comprises a direct current power supply, a first capacitor, a second capacitor, a third capacitor, a switch bridge arm, a first load and a second load. The switch bridge arm is formed by connecting an upper switch group, a middle switch group, a lower switch group and a coupled inductor in series. The upper switch group, the middle switch group and the lower switch group are respectively formed by connecting N power switch units in series. One end of the first load is connected to the middle point of the first capacitor and the middle point of the second capacitor, and the other end of the first load is connected to the upper end of the middle switch group. One end of the second load is connected to the middle point of the second capacitor and the middle point of the third capacitor, and the other end of the second load is connected to the lower end of the middle switch group. Carrier phase shifting PWM control is adopted for the inverter, two paths of N+1 level alternating voltages without direct current bias can be output, and the inverter is suitable for high-pressure, high-power and dual-load occasions. The coupled inductor in the inverter can be replaced by two independent inductors.
Description
Technical field
The present invention relates to module and combine many level (MMC) converter field, be specifically related to single-phase three switches set MMC inverter and the control methods thereof of a kind of dual output without direct current biasing.
Background technology
, under this trend, there is the direction of two kinds of improvement converters: reduce passive device or improve converter topology structure to reduce active device as the new development that reduces active device direction at present power inverter forward miniaturization, high reliability and low-loss future development.Single-phase three switch converters have reduced a switch and corresponding drive circuit with respect to four traditional switch converters, in the application of considering cost and volume, occupy certain advantage.But the single-phase output of two-way of three switch converters is two level, output AC waveform is poor.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 switch converters 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 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.But, when the alternating current circuit of two different frequencies connected, needing 2 MMC converters, this has increased engineering cost greatly.
Summary of the invention
The object of the invention is to overcome above-mentioned the deficiencies in the prior art, propose single-phase three switches set MMC inverter and the control methods thereof of a kind of dual output without direct current biasing.
The technical solution used in the present invention is as follows.
The single-phase three switches set MMC inverters of dual output without direct current biasing comprise DC power supply, the first electric capacity, the second electric capacity, the 3rd electric capacity, switch brachium pontis, the first load and the second load; Described switch brachium pontis is by upper switches set, middle switches set, lower switches set and coupling inductance series connection; Upper switches set is in series into 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; One end of the first load is received the mid point of the first electric capacity, the second electric capacity, and the other end of the first load is received the upper end of middle switches set; One end of the second load is received the mid point of the second electric capacity, the 3rd electric capacity, and the other end of the second load is received the lower end of middle switches set; Export as the first via at the two ends of the first load, and export as the second tunnel at the two ends of the second load; The voltage of the first electric capacity, the second electric capacity and the 3rd electric capacity is U
dc/ 3.The former secondary of coupling inductance is substituted by the first inductance and two separate inductors of the second inductance.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 converter.
In the single-phase three switches set MMC inverters of the above-mentioned dual output without direct current biasing, in the single-phase three switches set MMC inverters of the described dual output without direct current biasing, the positive pole of the positive pole of DC power supply and the first electric capacity, the upper end of upper switches set connects, the lower end of upper switches set is connected with the Same Name of Ends on the former limit of coupling inductance, the non-same polarity on the former limit of coupling inductance is connected with the upper end of middle switches set, the lower end of middle switches set is connected with the Same Name of Ends of coupling inductance secondary, the non-same polarity of coupling inductance secondary is connected with the upper end of lower switches set, the negative pole of the lower end of lower switches set and the 3rd electric capacity, the negative pole of DC power supply, ground end connects, the positive pole of the 3rd electric capacity is connected with the negative pole of the second electric capacity, the positive pole of the second electric capacity is connected with the negative pole of the first electric capacity, one end of the first load is connected with the upper end of middle switches set, and the other end of the first load is connected with the positive pole of the second electric capacity, and one end of the second load is connected with the lower end of middle switches set, and the other end of b road load is connected with the negative pole of the second electric capacity.
In the single-phase three switches set MMC inverters of the above-mentioned dual output without direct current biasing, power switch unit is by 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 inverters of the above-mentioned dual output without direct current biasing, the second output of i power switch unit of upper switches set is connected with the first output of i+1 power switch unit, and wherein i value is 1～N-1; The second output of i power switch unit of middle switches set is connected with the first output of i+1 power switch unit; The second output of i power switch unit of lower switches set is connected with the first output of i+1 power switch unit.
In the control method of the single-phase three switches set MMC inverters of the above-mentioned dual output without direct current biasing, 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; I power switch unit of upper switches set and i power switch unit of lower switches set adopt identical triangular wave as i carrier wave C
i, wherein i value is 1～N; N carrier wave 360 °/N of lagging phase angle successively; The direct current biasing that first via output employing sine-wave superimposed value is 1/3 is as the first modulating wave R
athe direct current biasing that the+1/3, second tunnel output employing sine-wave superimposed 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 i carrier wave C
iby the first comparator, obtain the control level of the second switch pipe gate pole of i power switch unit of upper switches set, as the first modulating wave R
a+ 1/3 is greater than i carrier wave C
itime, the first comparator output high level, as the first modulating wave R
a+ 1/3 is less than i carrier wave C
itime, the first comparator output low level, wherein the value of i is 1～N; The second modulating wave R
b-1/3 and i carrier wave C
iby the second comparator, obtain the control level of the second switch pipe gate pole of i power switch unit of lower switches set, as the second modulating wave modulating wave R
b-1/3 is less than i carrier wave C
itime, the second comparator output high level, as the second modulating wave modulating wave R
b-1/3 is greater than i carrier wave C
itime, the second comparator output low level; The control level of the control level of second switch pipe gate pole of i power switch unit of upper switches set and the second switch pipe gate pole of i power switch unit of lower switches set obtains the control level of second switch pipe gate pole in i 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.
Without the mode of operation of the single-phase three switches set MMC inverters of dual output of direct current biasing, comprise that in CF pattern, the frequency that first via output is exported with the second tunnel is identical with mode of operation (CF pattern) and alien frequencies mode of operation (DF pattern) frequently, amplitude is not identical; In DF pattern, frequency and the amplitude of first via output and the output of the second tunnel are all not identical.
Compared with prior art, the advantage that the present invention has is: have two-way N+1 level and exchange output, output current wave is of high quality, 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 three switch converters, the two-way output of the single-phase three switches set MMC inverters of the dual output without direct current biasing provided by the present invention is N+1 level and exchanges output, and the quality of output AC 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 present invention 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 in high pressure and large-power occasions without the single-phase three switches set MMC inverters of dual output of direct current biasing.Compare with existing MMC converter, the single-phase three switches set MMC inverters of the dual output without direct current biasing provided by the present invention have two-way exchange output, can be directly used in two different frequencies alternating current circuit be connected, greatly reduce engineering cost.
Accompanying drawing explanation
Fig. 1 is the circuit structure diagram of the single-phase three switches set MMC inverters of the dual output without direct current biasing of the present invention;
Fig. 2 is the circuit structure diagram of the power switch unit of the single-phase three switches set MMC inverters of the dual output without direct current biasing of the present invention;
Fig. 3 is the structure chart of the phase-shifting carrier wave PWM control method of the single-phase three switches set MMC inverters of the dual output without direct current biasing shown in Fig. 1;
Fig. 4 a, 4b are that the single-phase three switches set MMC inverters of the dual output without direct current biasing shown in Fig. 1 work in respectively CF pattern and the modulating wave of DF pattern and the relation of carrier wave;
Fig. 5 a, 5b are the simulation waveform figure that works in respectively CF pattern and DF pattern without the single-phase five level three switches set MMC inverters of dual output of direct current biasing.
Embodiment
For further setting forth content of the present invention and feature, below in conjunction with accompanying drawing, specific embodiment of the invention is described, but enforcement of the present invention is not limited to this.
With reference to figure 1, the single-phase three switches set MMC inverters of the dual output without direct current biasing of the present invention, comprise DC power supply U
dc, the first capacitor C
1, the second capacitor C
2, the 3rd capacitor C
3, switch brachium pontis, the first load and the second load; Described switch brachium pontis is by upper switches set H, middle switches set M, lower switches set L and coupling inductance (L
h: L
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; One end of the first load is received the first capacitor C
1, the second capacitor C
2mid point, the other end of the first load is received the upper end o of middle switches set M; One end of the second load is received the second capacitor C
2, the 3rd capacitor C
3mid point, the other end of the second load is received the lower end p of middle switches set M; Export as the first via at the two ends of the first load, and export as the second tunnel at the two ends of the second load; The first capacitor C
1, the second capacitor C
2with the 3rd capacitor C
3voltage be U
dc/ 3.Wherein, DC power supply U
dcpositive pole and the first capacitor C
1the upper end o of positive pole, upper switches set H connect, the lower end p of upper switches set H and coupling inductance (L
h: L
l) former limit L
hsame Name of Ends w connect, coupling inductance (L
h: L
l) former limit L
hnon-same polarity a be connected with the upper end o of middle switches set M, the lower end p of middle switches set M and coupling inductance (L
h: L
l) secondary L
lsame Name of Ends b connect, coupling inductance (L
h: L
l) secondary L
lnon-same polarity z be connected with the upper end o of lower switches set L, the lower end p of lower switches set L and the 3rd capacitor C
3negative pole, DC power supply U
dcnegative pole, hold n connect, the 3rd capacitor C
3positive pole and the second capacitor C
2negative pole connect, the second capacitor C
2positive pole and the first capacitor C
1negative pole connect; One end of the first load is connected with the upper end o of middle switches set M, the other end of the first load and the second capacitor C
2positive pole connect, one end of the second load is connected with the lower end p of middle switches set M, the other end of b road load and the second capacitor C
2negative pole connect.
Fig. 2 illustrates the circuit structure diagram of the power switch unit of the single-phase three switches set MMC inverters of the dual output without direct current biasing shown in Fig. 1.Power switch unit is by 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 the power switch unit SM of upper switches set H
hithe second output and i+1 power switch unit SM
h (i+1)first output connect, wherein i value is 1～N-1; I the power switch unit SM of middle switches set M
mithe second output and i+1 power switch unit SM
m (i+1)first output connect; I the power switch unit SM of lower switches set L
lithe second output and i+1 power switch unit SM
l (i+1)first output connect.
As shown in Figure 1, the both end voltage of the first load and the second load is respectively:
In formula, u
hfor the output voltage of upper switches set (H), u
mfor the output voltage of upper switches set (M), u
lfor the output voltage of lower switches set (L).
Again:
Known according to formula (6), the direct current biasing that first via output employing sine-wave superimposed value is 1/3 is as the first modulating wave R
athe direct current biasing that the+1/3, second tunnel output employing sine-wave superimposed value is 1/3 is as the second modulating wave R
b-1/3.
The single-phase three switches set MMC inverters of the dual output without direct current biasing shown in Fig. 1 adopt phase-shifting carrier wave PWM to control, as shown in Figure 3.The first modulating wave R
a+ 1/3 and i carrier wave C
iby the first comparator, obtain i the power switch unit SM of upper switches set H
hjsecond switch pipe S
2the control level S of gate pole
hi, as the first modulating wave R
a+ 1/3 is greater than i carrier wave C
itime, the first comparator output high level, as the first modulating wave R
a+ 1/3 is less than i carrier wave C
itime, the first comparator output low level, wherein the value of i is 1～N; The second modulating wave R
b-1/3 and i carrier wave C
iby the second comparator, obtain i the power switch unit SM of lower switches set L
lisecond switch pipe S
2the control level S of gate pole
li, as the second modulating wave modulating wave R
b-1/3 is less than i carrier wave C
itime, the second comparator output high level, as the second modulating wave modulating wave R
b-1/3 is greater than i carrier wave C
itime, the second comparator output low level; I the power switch unit SM of upper switches set H
hjsecond switch pipe S
2the control level S of gate pole
hii the power switch unit SM with lower switches set L
lisecond switch pipe S
2the control level S of gate pole
liby XOR gate, obtain i the power switch unit SM of middle switches set M
mimiddle second switch pipe S
2the control level S of gate pole
mi; 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 guarantee described converter each time be carved with the output voltage U of N power switch unit
sM=E, the output voltage U of 2N the true unit of power
sM=0, meet U
h+ U
m+ U
l=U
dc, wherein E is electric capacity (C in each power switch unit
sM) on voltage, and have E=U
dc/ N.
Fig. 4 a illustrates that the single-phase three switches set MMC inverters of the dual output without direct current biasing shown in Fig. 1 work in the first modulating wave R under CF pattern
a+ 1/3, the second modulating wave R
b-1/3 and i carrier wave C
irelation.From Fig. 4 a, can find out, first via output is identical with the electric voltage frequency of the second tunnel output, and the voltage magnitude maximum of first via output and the output of the second tunnel is 2/3.Fig. 4 b illustrates that the single-phase three switches set MMC inverters of the dual output without direct current biasing shown in Fig. 1 work in the first modulating wave R under DF pattern
a+ 1/3, the second modulating wave R
b-1/3 and i carrier wave C
irelation.From Fig. 4 b, can find out, the electric voltage frequency of first via output and the output of the second tunnel is not identical, and the voltage magnitude of first via output and the output of the second tunnel is 1/3 to the maximum.
Fig. 5 a is the simulation waveform figure that the single-phase five level three switches set MMC inverters of dual output work in CF pattern, the voltage of the first load, voltage, the electric current of the first load and the electric current of the second load of the second load from top to bottom successively, identical with the power frequency of the second load from visible the first load of Fig. 5 a, the current amplitude of the first load and the second load is not identical; Fig. 5 b is the simulation waveform figure that the single-phase five level three switches set MMC inverters of dual output work in DF pattern, be successively from top to bottom the voltage of the first load, voltage, the electric current of the first load and the electric current of the second load of the second load, all not identical from power frequency and the amplitude of visible the first load of Fig. 5 b and the second load.
Above-described embodiment is preferably execution mode of the present invention; but embodiments of the present invention are not limited by the examples; other any do not deviate from change, the modification done under Spirit Essence of the present invention and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection scope of the present invention.
Claims (8)
1. without the single-phase three switches set MMC inverters of dual output of direct current biasing, it is characterized in that: comprise DC power supply (U
dc), the first electric capacity (C
1), the second electric capacity (C
2), the 3rd electric capacity (C
3), switch brachium pontis, the first load and the second load; Described switch brachium pontis is by upper switches set (H), middle switches set (M), lower switches set (L) and coupling inductance (L
h: L
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; One end of the first load is received the first electric capacity (C
1), the second electric capacity (C
2) mid point, the other end of the first load is received the upper end (o) of middle switches set (M); One end of the second load is received the second electric capacity (C
2), the 3rd electric capacity (C
3) mid point, the other end of the second load is received the lower end (p) of middle switches set (M); Export as the first via at the two ends of the first load, and export as the second tunnel at the two ends of the second load; The first electric capacity (C
1), the second electric capacity (C
2) and the 3rd electric capacity (C
3) voltage be U
dc/ 3.
2. the single-phase three switches set MMC inverters of the dual output without direct current biasing according to claim 1, is characterized in that: coupling inductance (L
h: L
l) former limit and secondary by the first inductance (L
h) and the second inductance (L
l) two separate inductors substitute.
3. the single-phase three switches set MMC inverters of the dual output without direct current biasing according to claim 1, is characterized in that: DC power supply (U
dc) positive pole and the first electric capacity (C
1) the upper end of positive pole, upper switches set (H) connect, the lower end of upper switches set (H) and coupling inductance (L
h: L
l) former limit (L
h) Same Name of Ends (w) connect, coupling inductance (L
h: L
l) former limit (L
h) non-same polarity (a) be connected with the upper end of middle switches set (M), the lower end of middle switches set (M) and coupling inductance (L
h: L
l) secondary (L
l) Same Name of Ends (b) connect, coupling inductance (L
h: L
l) secondary (L
l) non-same polarity (z) be connected with the upper end of lower switches set (L), the lower end of lower switches set (L) and the 3rd electric capacity (C
3) negative pole, DC power supply (U
dc) negative pole, hold (n) connect, the 3rd electric capacity (C
3) positive pole and the second electric capacity (C
2) negative pole connect, the second electric capacity (C
2) positive pole and the first electric capacity (C
1) negative pole connect; One end of the first load is connected with the upper end of middle switches set (M), the other end of the first load and the second electric capacity (C
2) positive pole connect, one end of the second load is connected with the lower end of middle switches set (M), the other end of b road load and the second electric capacity (C
2) negative pole connect.
4. the single-phase three switches set MMC inverters of the dual output without direct current biasing according to claim 1, is characterized in that: power switch unit is by 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 inverters of the dual output without direct current biasing according to claim 1, is characterized in that: i power switch unit (SM of upper switches set (H)
hi) the second output and i+1 power switch unit (SM
h (i+1)) first output connect, wherein i value is 1 ~ N-1; I power switch unit (SM of middle switches set (M)
mi) the second output and i+1 power switch unit (SM
m (i+1)) first output connect; I power switch unit (SM of lower switches set (L)
li) the second output and i+1 power switch unit (SM
l (i+1)) first output connect.
6. the single-phase three switches set MMC inverters of the dual output without direct current biasing according to claim 1, it is characterized in that: mode of operation comprises with frequency mode of operation and alien frequencies mode of operation, in frequency mode of operation, first via output is identical with the frequency of the second tunnel output, and amplitude is not identical; In alien frequencies mode of operation, frequency and the amplitude of first via output and the output of the second tunnel are all not identical.
7. for the control method of the single-phase three switches set MMC inverters of the dual output without direct current biasing claimed in claim 1, it is characterized in that: in employing phase-shifting carrier wave PWM control, the switching tube of switches set (H), middle switches set (M) and lower switches set (L) opening and turn-offing; I power switch unit (SM of upper switches set (H)
hi) and i power switch unit (SM of lower switches set (L)
li) adopt identical triangular wave as i carrier wave C
i, wherein i value is 1 ~ N; N carrier wave (C
1, C
2..., C
n) 360 °/N of lagging phase angle successively; The direct current biasing that first via output employing sine-wave superimposed value is 1/3 is as the first modulating wave R
athe direct current biasing that the+1/3, second tunnel output employing sine-wave superimposed value is 1/3 is as the second modulating wave R
b-1/3.
8. control method according to claim 6, is characterized in that: the first modulating wave R
a+ 1/3 and i carrier wave C
iby the first comparator, obtain i power switch unit (SM of upper switches set (H)
hj) second switch pipe (S
2) control level (S of gate pole
hi), as the first modulating wave R
a+ 1/3 is greater than i carrier wave C
itime, the first comparator output high level, as the first modulating wave R
a+ 1/3 is less than i carrier wave C
itime, the first comparator output low level, wherein the value of i is 1 ~ N; The second modulating wave R
b-1/3 and i carrier wave C
iby the second comparator, obtain i power switch unit (SM of lower switches set (L)
li) second switch pipe (S
2) control level (S of gate pole
li), as the second modulating wave modulating wave R
b-1/3 is less than i carrier wave C
itime, the second comparator output high level, as the second modulating wave modulating wave R
b-1/3 is greater than i carrier wave C
itime, the second comparator output low level; I power switch unit (SM of upper switches set (H)
hj) second switch pipe (S
2) control level (S of gate pole
hi) and i power switch unit (SM of lower switches set (L)
li) second switch pipe (S
2) control level (S of gate pole
li) by XOR gate, obtain i power switch unit (SM of middle switches set (M)
mi) middle second switch pipe (S
2) control level (S of gate pole
mi); Second switch pipe (S in each power switch unit of each switches set
2) obtain the first switching tube (S of this power switch unit after the control level of gate pole is anti-phase
1) control level of gate pole.
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| CN201410042990.5A CN103762879B (en) | 2014-01-28 | 2014-01-28 | Single-phase three switches set MMC inverter and the control methods thereof of dual output without direct current biasing |
| PCT/CN2014/075997 WO2015113328A1 (en) | 2014-01-28 | 2014-04-22 | Multi-terminal high-voltage modular multilevel converter |
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| CN201410042990.5A CN103762879B (en) | 2014-01-28 | 2014-01-28 | Single-phase three switches set MMC inverter and the control methods thereof of dual output without direct current biasing |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106208774A (en) * | 2016-09-13 | 2016-12-07 | 佛山科学技术学院 | A kind of single-phase five-level converter of dual output |
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| CN107104600A (en) * | 2016-02-23 | 2017-08-29 | 西门子公司 | Modular multilevel converter and electric power electric transformer |
| CN107104600B (en) * | 2016-02-23 | 2019-09-17 | 西门子公司 | Modular multilevel converter and electric power electric transformer |
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| CN110521105A (en) * | 2017-04-05 | 2019-11-29 | Abb瑞士股份有限公司 | DC migration in modular multilevel converter |
| CN110521105B (en) * | 2017-04-05 | 2021-07-16 | Abb电网瑞士股份公司 | Modular multilevel converter and DC offset compensation method thereof |
| CN108631633A (en) * | 2018-05-30 | 2018-10-09 | 上海海事大学 | A kind of mixing capacitance voltage type Shuangzi block coupled in series topological structure based on MMC |
| CN108631633B (en) * | 2018-05-30 | 2020-08-25 | 上海海事大学 | MMC-based hybrid capacitor voltage type dual-sub-module series connection topological structure |
| CN110677068A (en) * | 2019-10-23 | 2020-01-10 | 西安交通大学 | High-voltage high-frequency waveform generator |
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