CN104242720A - Modular multilevel converter (MMC) of alternating current side cascading H-bridge - Google Patents
Modular multilevel converter (MMC) of alternating current side cascading H-bridge Download PDFInfo
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- CN104242720A CN104242720A CN201410460522.XA CN201410460522A CN104242720A CN 104242720 A CN104242720 A CN 104242720A CN 201410460522 A CN201410460522 A CN 201410460522A CN 104242720 A CN104242720 A CN 104242720A
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- switching tube
- brachium pontis
- electric capacity
- bridge submodule
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Abstract
The invention provides a modular multilevel converter (MMC) of an alternating current side cascading H-bridge. Each phase of circuit is composed of an upper bridge arm, a lower bridge arm, an alternating current side bridge arm, a first capacitor and a second capacitor, wherein the circuit structures of the upper bridge arm and the lower bridge arm are identical, the upper bridge arm and the lower bridge arm are respectively formed by connecting N half-bridge submodules and one inducer in series, and the alternating current side bridge arm is composed of M full-bridge submodules. The MMC can operate at an STATCOM state and has the capacity of automatically clearing direct current side short-circuit faults. Compared with an existing MMC only composed of half-bridge submodules, the MMC of the alternating current side cascading H-bridge saves a large number of switching tubes and lowers cost.
Description
Technical field
The present invention relates to composite module multi-level converter field, be specifically related to the mixing module multi-level converter of AC cascaded H-bridges.
Background technology
Along with the development of high voltage direct current transmission, multi-level converter obtains huge development.Wherein, block combiner multi-level converter (Modular Multilevel Converter, MMC) as a kind of novel many level topologys, except having the advantage of traditional multi-level converter, block combiner 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, block combiner multi-level converter is particularly useful for HVDC (High Voltage Direct Current) transmission system application.
At present, MMC submodule mainly contains half-bridge submodule and full-bridge submodule two kinds.The MMC structure be made up of half-bridge submodule is simple, but does not have dc-side short-circuit fault self-cleaning ability; The MMC be made up of full-bridge submodule has dc-side short-circuit fault self-cleaning ability, but needs double device, and cost is very high.
Summary of the invention
The object of the invention is to overcome above-mentioned the deficiencies in the prior art, propose the mixing module multi-level converter of AC cascaded H-bridges.
Object of the present invention is achieved through the following technical solutions:
The mixing module combination multi-level converter of AC cascaded H-bridges, its every circuitry phase is made up of upper brachium pontis, lower brachium pontis, AC brachium pontis, the first electric capacity and the second electric capacity; The circuit structure of described upper brachium pontis and lower brachium pontis is completely the same.The positive pole of the first electric capacity is connected with one end of upper brachium pontis, and the other end of upper brachium pontis is connected with one end of lower brachium pontis, one end of AC brachium pontis, and the other end of lower brachium pontis is connected with the negative pole of the second electric capacity, the positive pole of the second electric capacity and the negative pole of the first electric capacity, be connected; The positive pole of the first electric capacity is connected with the positive pole of DC transmission system DC side, and the negative pole of the second electric capacity is connected with the negative pole of DC transmission system DC side, and the other end of AC brachium pontis is connected with DC transmission system AC.
Further optimal enforcement, described upper brachium pontis is made up of N number of half-bridge submodule and inductance; N number of half-bridge submodule is connected successively, and form half-bridge submodule string, one end of half-bridge submodule string is connected with one end of inductance, and the other end of half-bridge submodule string is as one end of upper brachium pontis, and the other end of inductance is as the other end of upper brachium pontis.Described AC brachium pontis is connected successively by M full-bridge submodule, forms full-bridge submodule string, the two ends conduct of full-bridge submodule string.The two ends of AC brachium pontis.
Further optimal enforcement, half-bridge submodule is made up of the first switching tube, second switch pipe and the 3rd electric capacity; The collector electrode of the first switching tube is connected with the positive pole of the 3rd electric capacity, and the negative pole of the 3rd electric capacity is connected with the emitter of second switch pipe, and the emitter of the first switching tube is connected with the collector electrode of second switch pipe; The collector electrode of second switch pipe, emitter are as the two ends of half-bridge submodule.Full-bridge submodule is made up of the 3rd switching tube, the 4th switching tube, the 5th switching tube, the 6th switching tube and the 4th electric capacity; The collector electrode of the 3rd switching tube is connected with the collector electrode of the positive pole of the 4th electric capacity, the 4th switching tube, the emitter of the 3rd switching tube is connected with the collector electrode of the 5th switching tube, the emitter of the 4th switching tube is connected with the collector electrode of the 6th switching tube, and the emitter of the 5th switching tube is connected with the emitter of the negative pole of the 4th electric capacity, the 6th switching tube; The collector electrode of the 5th switching tube, the collector electrode of the 6th switching tube are as the two ends of full-bridge submodule.
Compared with prior art, the advantage that the present invention has is: have dc-side short-circuit fault self-cleaning ability, can run on static reactive (Static Synchronous Compensator, STATCOM) state.Compared with the existing MMC be only made up of half-bridge submodule, the present invention has dc-side short-circuit fault self-cleaning ability; Compared with the existing MMC be only made up of full-bridge submodule, the present invention uses switching tube number to greatly reduce, and reduces cost.
Accompanying drawing explanation
Fig. 1 is the circuit structure diagram of the mixing module combination multi-level converter of AC cascaded H-bridges of the present invention;
Fig. 2 is the circuit structure diagram of the half-bridge submodule of the mixing module combination multi-level converter of the AC cascaded H-bridges shown in Fig. 1;
Fig. 3 is the circuit structure diagram of the full-bridge submodule of the mixing module combination multi-level converter of the AC cascaded H-bridges shown in Fig. 1;
Fig. 4 is the modulation waveform figure of the mixing module combination multi-level converter of the AC cascaded H-bridges shown in Fig. 1;
Fig. 5 be the three-phase mixing module combination multi-level converter DC side of AC cascaded H-bridges be short-circuited fault time equivalent electric circuit;
Fig. 6 is the equivalent electric circuit that the three-phase mixing module of AC cascaded H-bridges combines that multi-level converter works in STATCOM state.
Embodiment
For setting forth content of the present invention and feature further, below in conjunction with accompanying drawing, specific embodiment of the invention scheme is specifically described, but enforcement of the present invention is not limited thereto.If there is the not special process described in detail below, be all that those skilled in the art can refer to existing techniques in realizing.
With reference to figure 1, every circuitry phase of the mixing module combination multi-level converter of AC cascaded H-bridges of the present invention is by upper brachium pontis 11, lower brachium pontis 12, AC brachium pontis 13, first electric capacity
c 1with the second electric capacity
c 2composition; The circuit structure of described upper brachium pontis 11 and lower brachium pontis 12 is completely the same.Wherein, the first electric capacity
c 1positive pole be connected with one end of upper brachium pontis 11, the other end of upper brachium pontis 11 and one end of lower brachium pontis 12, one end of AC brachium pontis 13
bconnect, the other end of lower brachium pontis 12 and the second electric capacity
c 2negative pole connect, the second electric capacity
c 2positive pole and the first electric capacity
c 1negative pole,
nconnect; First electric capacity
c 1positive pole be connected with the positive pole 15 of DC transmission system DC side, the second electric capacity
c 2negative pole be connected with the negative pole 16 of DC transmission system DC side, the other end of AC brachium pontis 13
abe connected with DC transmission system AC 14.
Described upper brachium pontis 11 is by N number of half-bridge submodule HSM
1, HSM
2..., HSM
nand inductance
lform; N number of half-bridge submodule HSM
1, HSM
2..., HSM
nconnect successively, form half-bridge submodule string, one end of half-bridge submodule string and inductance
lone end connect, the other end of half-bridge submodule string as one end of upper brachium pontis 11, inductance
lthe other end as the other end of upper brachium pontis 11.Described AC brachium pontis 13 is by M full-bridge submodule FSM
1, FSM
2..., FSM
mconnect successively, form full-bridge submodule string, the two ends of full-bridge submodule string are as the two ends of AC brachium pontis 13.
Described half-bridge submodule as shown in Figure 2, by the first switching tube
t 1, second switch pipe
t 2with the 3rd electric capacity
c 3form; First switching tube
t 1collector electrode and the 3rd electric capacity
c 3positive pole connect, the 3rd electric capacity
c 3negative pole and second switch pipe
t 2emitter connect, the first switching tube
t 1emitter and second switch pipe
t 2collector electrode connect; Second switch pipe
t 2collector electrode, emitter is as the two ends of half-bridge submodule; Described switching tube is IGBT.
Described full-bridge submodule as shown in Figure 3, by the 3rd switching tube
t 3, the 4th switching tube
t 4, the 5th switching tube
t 5, the 6th switching tube
t 6with the 4th electric capacity
c 4form; 3rd switching tube
t 3collector electrode and the 4th electric capacity
c 4positive pole, the 4th switching tube
t 4collector electrode connect, the 3rd switching tube
t 3emitter and the 5th switching tube
t 5collector electrode connect, the 4th switching tube
t 4emitter and the 6th switching tube
t 6collector electrode connect, the 5th switching tube
t 5emitter and the 4th electric capacity
c 4negative pole, the 6th switching tube
t 6emitter connect; 5th switching tube
t 5collector electrode, the 6th switching tube
t 6collector electrode as the two ends of full-bridge submodule.
The mixing module of AC cascaded H-bridges of the present invention combines the modulation waveform figure of multi-level converter as shown in Figure 4, single-phase output voltage
u an for sinusoidal waveform,
bpoint voltage
u bn for approaching sinusoidal wave staircase waveform, the output voltage of AC brachium pontis 13
u ab for single-phase output voltage
u an deduct
bpoint voltage
u bn .
With the three-phase of AC cascaded H-bridges (
u, v, w) mixing module combination multi-level converter be example, when DC side is short-circuited fault, namely all switching tubes of locking control all switching tubes when converter DC side is short-circuited fault and all turn off, its equivalent circuit diagram as shown in Figure 5, run the three-phase uncontrollable rectifier device being equivalent to DC side parallel electric capacity, short circuit current can be made to reduce rapidly, thus self-cleaning dc-side short-circuit fault.
With the three-phase of AC cascaded H-bridges (
u, v, w) mixing module combination multi-level converter is example, the first switching tube of each half-bridge submodule in brachium pontis 11 in control
t 1turn off, second switch pipe
t 2open-minded, all switching tubes of brachium pontis 12 under locking, its equivalent circuit diagram as shown in Figure 6, one end of the AC brachium pontis 13 of every phase
bbe connected to a bit, namely run on STATCOM state.
Above-described embodiment is the present invention's preferably execution mode; but embodiments of the present invention are not limited by the examples; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (6)
1. the mixing module combination multi-level converter of AC cascaded H-bridges, is characterized in that: every circuitry phase of converter comprise brachium pontis (11), lower brachium pontis (12), AC brachium pontis (13), the first electric capacity (
c 1) and the second electric capacity (
c 2); The circuit structure of described upper brachium pontis (11) and lower brachium pontis (12) is completely the same.
2. the mixing module combination multi-level converter of AC cascaded H-bridges according to claim 1, is characterized in that: the first electric capacity (
c 1) positive pole be connected with one end of upper brachium pontis (11), one end of the other end of upper brachium pontis (11) and one end of lower brachium pontis (12), AC brachium pontis (13) (
b) connect, the other end of lower brachium pontis (12) 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, (
n) connect; First electric capacity (
c 1) positive pole be connected with the positive pole (15) of DC transmission system DC side, the second electric capacity (
c 2) negative pole be connected with the negative pole (16) of DC transmission system DC side, the other end of AC brachium pontis (13) (
a) be connected with DC transmission system AC (14).
3. the mixing module combination multi-level converter of AC cascaded H-bridges according to claim 1, is characterized in that: described upper brachium pontis (11) is by N number of half-bridge submodule (HSM
1, HSM
2..., HSM
n) and inductance (
l) form; N number of half-bridge submodule (HSM
1, HSM
2..., HSM
n) connect successively, form half-bridge submodule string, one end of half-bridge submodule string and inductance (
l) one end connect, the other end of half-bridge submodule string as one end of upper brachium pontis (11), inductance (
l) the other end as the other end of upper brachium pontis (11).
4. the mixing module combination multi-level converter of AC cascaded H-bridges according to claim 1, is characterized in that: described AC brachium pontis (13) is by M full-bridge submodule (FSM
1, FSM
2..., FSM
m) connect successively, form full-bridge submodule string, the two ends of full-bridge submodule string are as the two ends of AC brachium pontis (13).
5. AC cascaded H-bridges according to claim 3 mixing module combination multi-level converter, it is characterized in that: described half-bridge submodule by the first switching tube (
t 1), second switch pipe (
t 2) and the 3rd electric capacity (
c 3) form; First switching tube (
t 1) collector electrode and the 3rd electric capacity (
c 3) positive pole connect, the 3rd electric capacity (
c 3) negative pole and second switch pipe (
t 2) emitter connect, the first switching tube (
t 1) emitter and second switch pipe (
t 2) collector electrode connect; Second switch pipe (
t 2) collector electrode, emitter is as the two ends of half-bridge submodule; Described switching tube is IGBT.
6. AC cascaded H-bridges according to claim 4 mixing module combination multi-level converter, it is characterized in that: described full-bridge submodule by the 3rd switching tube (
t 3), the 4th switching tube (
t 4), the 5th switching tube (
t 5), the 6th switching tube (
t 6) and the 4th electric capacity (
c 4) form; 3rd switching tube (
t 3) collector electrode and the 4th electric capacity (
c 4) positive pole, the 4th switching tube (
t 4) collector electrode connect, the 3rd switching tube (
t 3) emitter and the 5th switching tube (
t 5) collector electrode connect, the 4th switching tube (
t 4) emitter and the 6th switching tube (
t 6) collector electrode connect, the 5th switching tube (
t 5) emitter and the 4th electric capacity (
c 4) negative pole, the 6th switching tube (
t 6) emitter connect; 5th switching tube (
t 5) collector electrode, the 6th switching tube (
t 6) collector electrode as the two ends of full-bridge submodule.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410460522.XA CN104242720A (en) | 2014-09-11 | 2014-09-11 | Modular multilevel converter (MMC) of alternating current side cascading H-bridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410460522.XA CN104242720A (en) | 2014-09-11 | 2014-09-11 | Modular multilevel converter (MMC) of alternating current side cascading H-bridge |
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| Publication Number | Publication Date |
|---|---|
| CN104242720A true CN104242720A (en) | 2014-12-24 |
Family
ID=52230240
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105186911A (en) * | 2015-09-22 | 2015-12-23 | 华南理工大学 | DC side cascaded H-bridge hybrid module combined multilevel converter |
| CN105406743A (en) * | 2015-09-22 | 2016-03-16 | 华南理工大学 | Hybrid modular multi-level converter with asymmetric bridge arms |
| CN105656299A (en) * | 2015-01-30 | 2016-06-08 | 华北电力大学 | Starting strategy suitable for full-bridge modular multilevel converter |
| CN109167364A (en) * | 2018-11-09 | 2019-01-08 | 浙江大学 | The three port flexibility multimode switching devices based on bridge arm multiplexing and Mixed cascading |
| CN109302058A (en) * | 2018-10-11 | 2019-02-01 | 昆明理工大学 | A kind of direct current-direct current Modular multilevel converter and its control method with the output of three level of class |
| US10218285B2 (en) | 2015-10-19 | 2019-02-26 | Siemens Aktiengesellschaft | Medium voltage hybrid multilevel converter and method for controlling a medium voltage hybrid multilevel converter |
| CN110311381A (en) * | 2019-07-03 | 2019-10-08 | 国网江苏省电力有限公司电力科学研究院 | A kind of alternating current-direct current mixing grid power electronic transformer passing through DC Line Fault |
| CN111682576A (en) * | 2020-06-22 | 2020-09-18 | 哈尔滨工业大学(深圳)(哈尔滨工业大学深圳科技创新研究院) | Three-phase series CA-MMC (CA-Modular multilevel converter) with direct-current fault ride-through capability in flexible direct-current power transmission system and system |
| CN111864785A (en) * | 2020-08-14 | 2020-10-30 | 华中科技大学 | Alternating current-direct current fault-resistant alternating current side cascade type hybrid MMC topology and control method thereof |
| CN115987125A (en) * | 2023-03-21 | 2023-04-18 | 湖南大学 | Mixed MMC with doubled level number and modulation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111682576A (en) * | 2020-06-22 | 2020-09-18 | 哈尔滨工业大学(深圳)(哈尔滨工业大学深圳科技创新研究院) | Three-phase series CA-MMC (CA-Modular multilevel converter) with direct-current fault ride-through capability in flexible direct-current power transmission system and system |
| CN111864785A (en) * | 2020-08-14 | 2020-10-30 | 华中科技大学 | Alternating current-direct current fault-resistant alternating current side cascade type hybrid MMC topology and control method thereof |
| CN115987125A (en) * | 2023-03-21 | 2023-04-18 | 湖南大学 | Mixed MMC with doubled level number and modulation method thereof |
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Application publication date: 20141224 |