CN104426403A - Module unit suitable for high-capacity modularized multi-level voltage source converter - Google Patents
Module unit suitable for high-capacity modularized multi-level voltage source converter Download PDFInfo
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- CN104426403A CN104426403A CN201310407877.8A CN201310407877A CN104426403A CN 104426403 A CN104426403 A CN 104426403A CN 201310407877 A CN201310407877 A CN 201310407877A CN 104426403 A CN104426403 A CN 104426403A
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- power semiconductor
- semiconductor switch
- modular unit
- radiator
- voltage source
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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
- H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
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- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a module unit suitable for a high-capacity modularized multi-level voltage source converter. The module unit comprises a separated conversion unit and a fixed direct-current energy storage unit which are mutually connected, as well as a bottom plate and a clapboard, wherein the clapboard is movably installed on the bottom plate and capable of doing a reciprocating motion on the bottom plate; the separated conversion unit is installed on the clapboard, and the fixed direct-current energy storage unit is installed on the bottom plate. The structure is capable of solving the problems of device constraint and inconvenient maintenance of transmission power in the present flexible electricity transmission; the voltage source converter based on the module unit is capable of increasing the electricity transmission power; the equipment efficiency is high, the fault protection reliability is high, and the equipment maintainability is good.
Description
Technical field
The invention belongs to flexible direct-current transmission field, particularly a kind of converter valve modular unit being applicable to high-capacity module multi-level voltage source current converter.
Background technology
The core of flexible direct current power transmission system is the voltage source converter based on full control device.Multilevel converter is the preferred version realizing high-voltage large-capacity voltage source converter.Relative to two level converters, multilevel converter can use low-voltage device to realize voltage levels and export, and does not need the direct series connection of switching device.In recent years, the appearance of modularization multi-level converter (Modular Multilevel Converter, MMC) made multilevel converter have also been obtained successful application in flexible direct-current transmission field.
The converter valve of modularization multi-level converter adopts modularized design, in series by several structures identical elementary cell submodule, each submodule is called converter valve modular unit, by the sub-series number of modules in increase converter valve and levels of current, the lifting of converter valve voltage and power grade can be realized.But the development due to full-control type turn-off device is subject to the limitation of semiconductor technology evolves, its through-current capability does not catch up with the development level of Large Copacity converter valve, so the through-put power of converter valve is subject to certain limitation.
Modularization multi-level converter utilizes the cascade of modular unit to solve the direct tandeming problems of full control device, but each module all needs jumbo DC support electric capacity to carry out burning voltage, along with the continuous lifting of converter power grade, the factor such as volume, weight of DC support electric capacity by becoming, safeguard, the bottleneck of maintenance by converter valve.
Summary of the invention
Object of the present invention; be to provide a kind of modular unit being applicable to high-capacity module multi-level voltage source current converter; it can solve the problem that through-put power in current flexible transmission is subject to device restriction and safeguards inconvenience; voltage source converter based on this kind of modular unit can improve transmitted power; device efficiency is high; error protection reliability is high, and equipment maintainability is good.
In order to reach above-mentioned purpose, solution of the present invention is:
Be applicable to a modular unit for high-capacity module multi-level voltage source current converter, comprise interconnective separate type current transforming unit and fixed DC energy-storage units; Also comprise base plate and dividing plate, described dividing plate activity is installed on base plate, and can move back and forth on base plate; Described separate type current transforming unit is arranged on dividing plate, and fixed DC energy-storage units is arranged on base plate.
Above-mentioned fixed DC energy-storage units comprises a DC energy storage electric capacity or at least 2 DC energy storage electric capacity parallel with one another, described modular unit also comprises the first stack bus bar, all DC energy storage electric capacity carries out parallel connection by the first stack bus bar, and described first stack bus bar is fixed on base plate by framework.
Above-mentioned separate type current transforming unit comprises by-pass switch, 4 power semiconductor switches and linear quadratic control protected location, the emitter of the first power semiconductor switch connects the collector electrode of the second power semiconductor switch, the emitter of the 3rd power semiconductor switch connects the collector electrode of the 4th power semiconductor switch, and first, the collector electrode of three power semiconductor switches connects, second, the emitter of four power semiconductor switches connects, one end of described by-pass switch connects second, the collector electrode of four power semiconductor switches, the other end connects second, the emitter of four power semiconductor switches, the equal connecting secondary control and protection unit of control end of described by-pass switch and 4 power semiconductor switches,
Described modular unit also comprises power semiconductor switch radiator and the second stack bus bar, described power semiconductor switch radiator is arranged on the position near fixed DC energy-storage units on dividing plate, described power semiconductor switch is installed on power semiconductor switch radiator, and the second stack bus bar covers on power semiconductor switch; Described linear quadratic control protected location is located at the downside of power semiconductor switch radiator, and the outside of power semiconductor switch radiator is located at by by-pass switch.
Above-mentioned modular unit also comprises at least one water pipe, and one end of described water pipe connects power semiconductor switch radiator, and the other end connects water source.
Above-mentioned separate type current transforming unit also comprises 4 power semiconductor switch fly-wheel diodes and 1 power diode, described 4 power semiconductor switch fly-wheel diodes respectively with 4 corresponding reverse parallel connections of power semiconductor switch, and power diode and the second power semiconductor switch reverse parallel connection;
Described modular unit also comprises power diode radiator, and the upside of described by-pass switch is all located at by described power diode and power diode radiator.
Above-mentioned modular unit also comprises at least one water pipe, and one end of described water pipe connects power diode radiator, and the other end connects water source.
After adopting such scheme, fixed DC energy-storage units and separate type current transforming unit combine by the present invention, form the minimum module unit of composition voltage source converter complete function, by the orderly cascade of this modular unit, form the voltage source converter being applicable to different voltage, different capacity, there is following beneficial effect:
(1) separate type current transforming unit is a relatively independent entirety, and being fixed on dividing plate and can moving around on base plate, electrical connection is designed to detachable, realizes on-the-spot dismounting flexibly;
(2) all full control switching devices are placed in closed space, do not have the risk that parts splash during component failure;
(3) utilize the overcurrent protection of power diode formation to the power semiconductor switch fly-wheel diode in parallel with it, improve protection reliability, improve the efficiency of converter simultaneously;
(4) control and protection unit described in comprises full control switching device drive plate, subelement control board and power supply, and all electronic circuits are positioned at the closed area at full control switching device and the full control switching device fin back side, ensure electric relative independentability.
Accompanying drawing explanation
Fig. 1 is front view of the present invention;
Fig. 2 is vertical view of the present invention;
Fig. 3 is electrical schematic diagram of the present invention.
Embodiment
Below with reference to accompanying drawing, technical scheme of the present invention is described in detail.
The invention provides a kind of modular unit being applicable to high-capacity module multi-level voltage source current converter, comprise fixed DC energy-storage units 3 and separate type current transforming unit 6, first coordinate shown in Fig. 3, separate type current transforming unit 6 comprises by-pass switch K1,4 power semiconductor switch T1, T2, T3, T4,4 power semiconductor switch sustained diode 1, D2, D3, D4, all presses discharge resistance R1 and linear quadratic control protected location KZ1, and fixed DC energy-storage units 3 comprises a DC energy storage electric capacity or at least 2 DC energy storage electric capacity C1-Cn(n >=2); Wherein, T1 and D1 reverse parallel connection, T2 and D2 reverse parallel connection, and the emitter of T1 connects the collector electrode of T2, T3 and D3 reverse parallel connection, T4 and D4 reverse parallel connection, and the emitter of T3 connects the collector electrode of T4, and the collector electrode of T1 is connected with the collector electrode of T3, and the emitter of T2 and T4 connects; K1 can adopt mechanical freeze mode switch, and its one end connects the collector electrode of T2 and T4 respectively, and the other end connects the emitter of T2 and T4 respectively; One end of R1 connects the collector electrode of T1 and T3 respectively, and the other end connects the emitter of T2 and T4 respectively; The control end equal connecting secondary control and protection unit KZ1 of a described by-pass switch K1 and 4 power semiconductor switch T1-T4, is controlled conducting or the off state of each device by KZ1; Described fixed DC energy-storage units 3 is connected in parallel on described two ends of all pressing discharge resistance R1.Aforementioned is the common syndeton of existing modular unit, does not repeat them here.
Improvement of the present invention is: also comprise base plate 1, dividing plate 2, first stack bus bar 4 and the second stack bus bar 5, introduce respectively below.
As shown in Figure 1, dividing plate 2 is installed on base plate 1, and can move back and forth on base plate 1, realizes on-the-spot dismounting flexibly; Described fixed DC energy-storage units 3 is arranged on base plate 1, and separate type current transforming unit 6 is arranged on dividing plate 2, and can move around on base plate 1 with dividing plate 2; Described separate type current transforming unit 6 and fixed DC energy-storage units 3 adopt detachable to be electrically connected, and be separated by fixed DC energy-storage units 3 huge to itself and weight, facilitate maintenance and the replacing of modular unit when conveniently safeguarding at the scene.
All DC energy storage electric capacity in fixed DC energy-storage units 3 all realize parallel connection by the first stack bus bar 4, are then fixed on base plate 1 by framework by this first stack bus bar 4.
Separate type current transforming unit 6 comprises the T1-T4 in power semiconductor switch 13(and Fig. 3), K1 in power semiconductor switch radiator 10, by-pass switch 7(and Fig. 3), KZ1 in linear quadratic control protected location 14(and Fig. 3), all press discharge resistance and power semiconductor switch fly-wheel diode; separate type current transforming unit 6 is connected with fixed DC energy-storage units 3 by the second stack bus bar 5, can carry out separation upkeep operation easily at the scene.
In the present embodiment; described separate type current transforming unit 6 also comprises 12 in power diode D5(and Fig. 2) and power diode radiator 11; as shown in Figure 3; D5 and D2, D4 are in parallel in the same way, thus realize the overcurrent protection to D2, D4, improve protection reliability; simultaneously; performance due to power diode D5 is better than power semiconductor switch fly-wheel diode, so the loss of modular unit is less, the efficiency of whole converter is improved.
Coordinate shown in Fig. 2, described power semiconductor switch radiator 10 is arranged on dividing plate 2, and arrange near fixed DC energy-storage units 3, described power semiconductor switch 13 is installed on power semiconductor switch radiator 10, and be in the space of a relative closure, do not have the risk that parts splash during component failure; Second stack bus bar 5 covers on power semiconductor switch 13; Described power semiconductor switch radiator 10 can arrange one or more, with the demand of satisfied heat radiation.
Described linear quadratic control protected location 14 is located at the downside of power semiconductor switch radiator 10; and the outside of power semiconductor switch radiator 10 is located at by by-pass switch 7, the upside of this by-pass switch 7 is all located at by power diode 12 and power diode radiator 11.
Water pipe 9 is also provided with in the present embodiment, coordinate shown in Fig. 1, power semiconductor switch 13 and power diode 12 all adopt water cooling method, the connected mode of water route in modular unit can be that connect also can be in parallel, depend on the coupling of heat radiation power, power semiconductor switch radiator 10 and power diode radiator 11 realize the connection with external water source by water pipe 9.
Linear quadratic control protected location 14 comprises driver element, master control borad and DC power supply, and electronic circuit is positioned at closed cavity, significantly reduces the interference of external electromagnetic environment to secondary board.
In sum, a kind of modular unit being applicable to high-capacity module multi-level voltage source current converter of the present invention, is designed to a relatively independent entirety by separate type current transforming unit, electrical connection is designed to detachable; Fixed DC energy-storage units and separate type current transforming unit all with base plate 1 for supporting, can carry out installing, changing operation together, the problem that through-put power in current flexible transmission is subject to device restriction and safeguards inconvenience can be solved.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this.Person of an ordinary skill in the technical field is to be understood that: modify to the specific embodiment of the present invention or equivalent to replace, and do not depart from technological thought that the present invention proposes and scope any amendment or equivalent replace all should be encompassed in the claims in the present invention scope in the middle of.
Claims (6)
1. be applicable to a modular unit for high-capacity module multi-level voltage source current converter, comprise interconnective separate type current transforming unit and fixed DC energy-storage units; It is characterized in that: also comprise base plate and dividing plate, described dividing plate activity is installed on base plate, and can move back and forth on base plate; Described separate type current transforming unit is arranged on dividing plate, and fixed DC energy-storage units is arranged on base plate.
2. a kind of modular unit being applicable to high-capacity module multi-level voltage source current converter as claimed in claim 1, it is characterized in that: described fixed DC energy-storage units comprises a DC energy storage electric capacity or at least 2 DC energy storage electric capacity parallel with one another, described modular unit also comprises the first stack bus bar, all DC energy storage electric capacity carries out parallel connection by the first stack bus bar, and described first stack bus bar is fixed on base plate by framework.
3. a kind of modular unit being applicable to high-capacity module multi-level voltage source current converter as claimed in claim 1 or 2, it is characterized in that: described separate type current transforming unit comprises by-pass switch, 4 power semiconductor switches and linear quadratic control protected location, the emitter of the first power semiconductor switch connects the collector electrode of the second power semiconductor switch, the emitter of the 3rd power semiconductor switch connects the collector electrode of the 4th power semiconductor switch, and first, the collector electrode of three power semiconductor switches connects, second, the emitter of four power semiconductor switches connects, one end of described by-pass switch connects second, the collector electrode of four power semiconductor switches, the other end connects second, the emitter of four power semiconductor switches, the equal connecting secondary control and protection unit of control end of described by-pass switch and 4 power semiconductor switches,
Described modular unit also comprises power semiconductor switch radiator and the second stack bus bar, described power semiconductor switch radiator is arranged on the position near fixed DC energy-storage units on dividing plate, described power semiconductor switch is installed on power semiconductor switch radiator, and the second stack bus bar covers on power semiconductor switch; Described linear quadratic control protected location is located at the downside of power semiconductor switch radiator, and the outside of power semiconductor switch radiator is located at by by-pass switch.
4. a kind of modular unit being applicable to high-capacity module multi-level voltage source current converter as claimed in claim 3, it is characterized in that: described modular unit also comprises at least one water pipe, one end of described water pipe connects power semiconductor switch radiator, and the other end connects water source.
5. a kind of modular unit being applicable to high-capacity module multi-level voltage source current converter as claimed in claim 3, it is characterized in that: described separate type current transforming unit also comprises 4 power semiconductor switch fly-wheel diodes and 1 power diode, described 4 power semiconductor switch fly-wheel diodes respectively with 4 corresponding reverse parallel connections of power semiconductor switch, and power diode and the second power semiconductor switch reverse parallel connection;
Described modular unit also comprises power diode radiator, and the upside of described by-pass switch is all located at by described power diode and power diode radiator.
6. a kind of modular unit being applicable to high-capacity module multi-level voltage source current converter as claimed in claim 5, it is characterized in that: described modular unit also comprises at least one water pipe, one end of described water pipe connects power diode radiator, and the other end connects water source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310407877.8A CN104426403B (en) | 2013-09-09 | 2013-09-09 | Module unit suitable for high-capacity modularized multi-level voltage source converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310407877.8A CN104426403B (en) | 2013-09-09 | 2013-09-09 | Module unit suitable for high-capacity modularized multi-level voltage source converter |
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| CN104426403A true CN104426403A (en) | 2015-03-18 |
| CN104426403B CN104426403B (en) | 2017-05-17 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105553243A (en) * | 2015-12-22 | 2016-05-04 | 李灵超 | Symmetric capacitor plate and three-phase frequency converter |
| CN106230274A (en) * | 2016-08-30 | 2016-12-14 | 常州博瑞电力自动化设备有限公司 | A kind of detachable power model |
| CN106787817A (en) * | 2016-11-08 | 2017-05-31 | 中车株洲电力机车研究所有限公司 | The submodule and modularization multi-level converter of modularization multi-level converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105553243A (en) * | 2015-12-22 | 2016-05-04 | 李灵超 | Symmetric capacitor plate and three-phase frequency converter |
| CN106230274A (en) * | 2016-08-30 | 2016-12-14 | 常州博瑞电力自动化设备有限公司 | A kind of detachable power model |
| CN106787817A (en) * | 2016-11-08 | 2017-05-31 | 中车株洲电力机车研究所有限公司 | The submodule and modularization multi-level converter of modularization multi-level converter |
| CN106787817B (en) * | 2016-11-08 | 2019-02-22 | 中车株洲电力机车研究所有限公司 | The submodule and modularization multi-level converter of modularization multi-level converter |
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| Publication number | Publication date |
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| CN104426403B (en) | 2017-05-17 |
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