CN111355394A - Series hybrid MMC topological structure suitable for flexible direct current transmission - Google Patents
Series hybrid MMC topological structure suitable for flexible direct current transmission Download PDFInfo
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- CN111355394A CN111355394A CN201911239471.7A CN201911239471A CN111355394A CN 111355394 A CN111355394 A CN 111355394A CN 201911239471 A CN201911239471 A CN 201911239471A CN 111355394 A CN111355394 A CN 111355394A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
- H02M7/53875—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with analogue control of three-phase output
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
A series hybrid MMC topological structure suitable for flexible direct current transmission is divided into three phases, each phase only comprises one bridge arm, an upper bridge arm and a lower bridge arm are not distinguished, no current-suppressing inductor is needed in the bridge arms, each bridge arm is connected with a reversing circuit in series to form one phase, the three phases are connected in series, each phase is connected with one group of voltage-stabilizing capacitor group in parallel to distinguish the three phases, and each phase generates multi-level voltage. According to the invention, only one bridge arm is needed for each phase, so that the structural complexity is reduced and the number of switching tubes is reduced; the current-suppressing inductor is omitted from the bridge arm, so that the utilization rate of the direct-current side voltage is improved; three phases are connected in series, so that the size and the structural complexity of the system are reduced, and the manufacturing and operating costs are reduced; the characteristic of multi-level output voltage is reserved; when the half-bridge sub-modules adopt a full-bridge structure, the problem of direct-current fault ride-through can be solved.
Description
Technical Field
The invention relates to the technical field of flexible direct current power transmission, in particular to a series hybrid MMC topological structure suitable for flexible direct current power transmission.
Background
In the high-power field, the rapid development of power semiconductor devices, the rapid development of novel flexible high-voltage direct-current transmission and flexible alternating-current transmission technologies, and the high-voltage high-power electronic converter is used as an important device in the existing power system.
The modular multilevel conversion technology is an effective way for realizing high-performance high-power electric energy conversion, and various problems existing in the practical application of direct series and parallel connection technologies of power electronic power devices and the power electronic converter multiplexing technology are avoided.
In recent years, the national development and the electricity consumption demand of the living standard of people are continuously increased, and the requirements on energy conservation and environmental protection of an electric energy change system are increasingly raised in policy, so that the research on a modular multilevel conversion technology and the design and control of a medium-high voltage high-power electric energy conversion device are of great significance.
Each phase of the existing MMC topological structure is generally composed of 2N half-bridge submodules, each phase is divided into an upper bridge arm and a lower bridge arm, and a current-suppressing inductor is required to be connected in series in each bridge arm. When the MMC works normally, the upper bridge arm and the lower bridge arm are required to coordinate the number of the half-bridge submodules, and the switching condition of the half-bridge submodules is changed to realize multi-level output.
The prior topological structure has the following technical problems: the upper and lower bridge arms of each phase need to be distinguished, and need to run in coordination, so that the structure is complex and the number of switching tubes is increased; a current-suppressing inductor is connected in series in each bridge arm, so that the utilization rate of the voltage at the direct current side is reduced; three-phase circuits are connected in parallel, the size is large, the structure is complex, and the equipment manufacturing and operating cost is increased.
Disclosure of Invention
The invention aims to provide a series hybrid MMC topological structure suitable for flexible direct current power transmission, which can effectively improve the voltage utilization rate of a direct current side, reduce the number of switching tubes, reduce the volume and reduce the manufacturing and operating cost of equipment.
A series hybrid MMC topological structure suitable for flexible direct current transmission comprises three phases, wherein each phase consists of a series connection reversing circuit and a bridge arm, and the three phases are connected in series; each phase is connected with a group of voltage stabilizing capacitor groups in parallel;
each bridge arm comprises N half-bridge sub-modules which are connected in series;
the reversing circuit is formed by connecting four groups of switching tubes S1, S2, S3 and S4 in an H-bridge mode, wherein the upper end of the switching tube S1 is connected with the lower end of the last half-bridge submodule in a bridge arm, and the lower end of the switching tube S2 is connected with the upper end of the first half-bridge submodule in the next phase to form a phase-phase series connection mode;
and the anode of the first capacitor of the voltage-stabilizing capacitor bank of the first phase in the three phases is connected with the anode of the direct-current bus, and the cathode of the last capacitor of the voltage-stabilizing capacitor bank of the third phase is connected with the cathode of the direct-current bus.
Further, the connection point of the switch tube S1 and the switch tube S2 serves as one output end of the phase, and the connection point of the switch tube S3 and the switch tube S4 serves as the other output end of the phase.
Further, the voltage stabilizing capacitor banks of each phase are formed by selecting different numbers according to the specification of the capacitors used.
Furthermore, the anode of the first capacitor in the voltage-stabilizing capacitor bank of each phase is connected with the upper end of the first half-bridge submodule in the phase bridge arm, and the cathode of the last capacitor is connected with the lower end of the switch tube S2 in the phase commutation circuit, so that a parallel structure of the voltage-stabilizing capacitor bank and the phase is formed.
Compared with the prior art, the invention has the beneficial effects that: in the invention, each phase only adopts one bridge arm, thereby reducing the structural complexity of the system and greatly reducing the number of switching tubes; the current-suppressing inductor is removed from each phase, so that the utilization rate of the voltage at the direct current side is improved; three phases are connected in series, so that the size and the structural complexity of the system are reduced, and the manufacturing and running cost of equipment is reduced; output multi-level is preserved; when the half-bridge sub-module is adopted, the problem of direct current fault ride-through can be solved.
Drawings
Fig. 1 is a schematic structural diagram of a serial hybrid MMC topology according to an embodiment of the present invention.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the drawings in the specification.
A series hybrid MMC topological structure suitable for flexible direct current transmission comprises three phases, wherein each phase consists of a series connection reversing circuit and a bridge arm, and the three phases are connected in series; each phase is connected with a group of voltage stabilizing capacitor groups in parallel.
Each bridge arm comprises N half-bridge submodules connected in series. The commutation circuit is formed by connecting four groups of switching tubes S1, S2, S3 and S4 in an H-bridge mode, wherein the upper end of the switching tube S1 is connected with the lower end of the last half-bridge submodule in a bridge arm, and the lower end of the switching tube S2 is connected with the upper end of the first half-bridge submodule in the next phase to form a phase-phase series connection mode. The junction of the switch tube S1 and the switch tube S2 serves as one output terminal of the phase, and the junction of the switch tube S3 and the switch tube S4 serves as the other output terminal of the phase.
The voltage-stabilizing capacitor groups of each phase are formed by selecting different numbers according to the specification of the used capacitors.
The positive electrode of the first capacitor in the voltage-stabilizing capacitor bank of each phase is connected with the upper end of the first half-bridge submodule in the phase bridge arm, and the negative electrode of the last capacitor is connected with the lower end of the switching tube S2 in the phase commutation circuit, so that a parallel connection structure of the voltage-stabilizing capacitor bank and the phase is formed.
The positive pole of the first capacitor of the voltage-stabilizing capacitor bank of the first phase in the three phases is connected with the positive pole of the direct-current bus, and the negative pole of the last capacitor of the voltage-stabilizing capacitor bank of the third phase is connected with the negative pole of the direct-current bus.
The above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiment, but equivalent modifications or changes made by those skilled in the art according to the present disclosure should be included in the scope of the present invention as set forth in the appended claims.
Claims (4)
1. The utility model provides a series connection mixed type MMC topological structure suitable for flexible direct current transmission which characterized in that:
the topological structure comprises three phases, each phase consists of a reversing circuit and a bridge arm which are connected in series, and the three phases are connected in series; each phase is connected with a group of voltage stabilizing capacitor groups in parallel;
each bridge arm comprises N half-bridge sub-modules which are connected in series;
the reversing circuit is formed by connecting four groups of switching tubes S1, S2, S3 and S4 in an H-bridge mode, wherein the upper end of the switching tube S1 is connected with the lower end of the last half-bridge submodule in a bridge arm, and the lower end of the switching tube S2 is connected with the upper end of the first half-bridge submodule in the next phase to form a phase-phase series connection mode;
and the anode of the first capacitor of the voltage-stabilizing capacitor bank of the first phase in the three phases is connected with the anode of the direct-current bus, and the cathode of the last capacitor of the voltage-stabilizing capacitor bank of the third phase is connected with the cathode of the direct-current bus.
2. The MMC topology of claim 1, wherein: the junction of the switch tube S1 and the switch tube S2 serves as one output terminal of the phase, and the junction of the switch tube S3 and the switch tube S4 serves as the other output terminal of the phase.
3. The MMC topology of claim 1, wherein: the voltage-stabilizing capacitor groups of each phase are formed by selecting different numbers according to the specification of the used capacitors.
4. The MMC topology of claim 1, wherein: the positive electrode of the first capacitor in the voltage-stabilizing capacitor bank of each phase is connected with the upper end of the first half-bridge submodule in the phase bridge arm, and the negative electrode of the last capacitor is connected with the lower end of the switching tube S2 in the phase commutation circuit, so that a parallel connection structure of the voltage-stabilizing capacitor bank and the phase is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911239471.7A CN111355394A (en) | 2019-12-06 | 2019-12-06 | Series hybrid MMC topological structure suitable for flexible direct current transmission |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911239471.7A CN111355394A (en) | 2019-12-06 | 2019-12-06 | Series hybrid MMC topological structure suitable for flexible direct current transmission |
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| CN111355394A true CN111355394A (en) | 2020-06-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113872459A (en) * | 2021-09-22 | 2021-12-31 | 国网江苏省电力有限公司扬州供电分公司 | Serial MMC topological structure and control method |
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|---|---|---|---|---|
| CN102088252A (en) * | 2011-02-21 | 2011-06-08 | 浙江大学 | Inverter without transformer realized by switched capacitor and applications of inverter |
| CN102522913A (en) * | 2011-12-04 | 2012-06-27 | 中国科学院电工研究所 | Hybrid multi-level current transformation topology based on H full-bridge subunit and control method of hybrid multi-level current transformation topology |
| CN105164907A (en) * | 2013-08-29 | 2015-12-16 | 韩国电力公社 | High-voltage direct current converter |
| CN105720844A (en) * | 2016-04-22 | 2016-06-29 | 西安交通大学 | Novel three-phase serial modular multilevel converter HVDC converter |
| WO2016146171A1 (en) * | 2015-03-17 | 2016-09-22 | Siemens Aktiengesellschaft | Highly efficient power converter with single-phase systems |
| CN110100383A (en) * | 2016-12-21 | 2019-08-06 | Abb瑞士股份有限公司 | With the voltage source converter for improving operation |
-
2019
- 2019-12-06 CN CN201911239471.7A patent/CN111355394A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102088252A (en) * | 2011-02-21 | 2011-06-08 | 浙江大学 | Inverter without transformer realized by switched capacitor and applications of inverter |
| CN102522913A (en) * | 2011-12-04 | 2012-06-27 | 中国科学院电工研究所 | Hybrid multi-level current transformation topology based on H full-bridge subunit and control method of hybrid multi-level current transformation topology |
| CN105164907A (en) * | 2013-08-29 | 2015-12-16 | 韩国电力公社 | High-voltage direct current converter |
| WO2016146171A1 (en) * | 2015-03-17 | 2016-09-22 | Siemens Aktiengesellschaft | Highly efficient power converter with single-phase systems |
| CN105720844A (en) * | 2016-04-22 | 2016-06-29 | 西安交通大学 | Novel three-phase serial modular multilevel converter HVDC converter |
| CN110100383A (en) * | 2016-12-21 | 2019-08-06 | Abb瑞士股份有限公司 | With the voltage source converter for improving operation |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113872459A (en) * | 2021-09-22 | 2021-12-31 | 国网江苏省电力有限公司扬州供电分公司 | Serial MMC topological structure and control method |
| CN113872459B (en) * | 2021-09-22 | 2022-12-02 | 国网江苏省电力有限公司扬州供电分公司 | Control method of serial MMC topological structure |
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Application publication date: 20200630 |