CN109149974B - MMC half-bridge submodule with upper switching tube short-circuit protection function - Google Patents
MMC half-bridge submodule with upper switching tube short-circuit protection function Download PDFInfo
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- CN109149974B CN109149974B CN201710452745.5A CN201710452745A CN109149974B CN 109149974 B CN109149974 B CN 109149974B CN 201710452745 A CN201710452745 A CN 201710452745A CN 109149974 B CN109149974 B CN 109149974B
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- switch tube
- bridge submodule
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- 239000003990 capacitor Substances 0.000 claims description 18
- 230000005540 biological transmission Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000007599 discharging Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 1
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Classifications
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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
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc 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
- H02M7/217—Conversion of ac power input into dc 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
- H02M7/219—Conversion of ac power input into dc 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 in a bridge configuration
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/322—Means for rapidly discharging a capacitor of the converter for protecting electrical components or for preventing electrical shock
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Direct Current Feeding And Distribution (AREA)
- Protection Of Static Devices (AREA)
Abstract
The invention relates to the field of high-voltage direct-current transmission, and provides an MMC half-bridge submodule with an upper switching tube short-circuit protection function.
Description
Technical Field
The invention relates to the field of high-voltage direct-current power transmission, in particular to an MMC half-bridge submodule with an upper switching tube short-circuit protection function.
Background
In the operation process of the MMC flexible direct-current transmission engineering, each bridge arm of the MMC flexible direct-current transmission converter valve is generally formed by serially connecting hundreds of MMC flexible direct-current transmission sub-modules as shown in fig. 1, wherein OUT1 and OUT2 are output ports of the MMC sub-modules and are used for being serially connected with adjacent MMC sub-modules, T1 is an upper switch tube, T2 is a lower switch tube, K1 is a bypass switch, and C1 is a direct-current support capacitor.
In the event of a fault in the MMC sub-module, the bypass switch K1 is closed, thereby bypassing the MMC sub-module. When the lower switch tube T2 is short-circuited, the C1, the T1 and the K1(T2) form a short-circuit discharge loop, and at the moment, the T1 is still controllable, so that the discharge loop can be disconnected by controlling the T1, and the damage of the discharge of the C1 to elements in the discharge loop can be avoided. When the upper switch tube T1 is in short circuit, the short-circuit sub-module is cut off rapidly by closing the bypass switch K1, so that the system is kept running, but after the bypass switch K1 is closed, the short-circuit sub-module discharges due to the direct-current supporting capacitor, short-circuit current can be generated in a discharging loop formed by the K1, the T1 and the C1, the short-circuit current reaches hundreds of kiloamperes, and the large current can seriously damage a connecting bus bar, internal elements of the K1, internal elements of the direct-current supporting capacitor and the like, and the consequence is unreasonable.
Disclosure of Invention
The invention provides an MMC half-bridge submodule with an upper switching tube short-circuit protection function, which is used for solving the problem that a discharge loop is formed in the submodule due to the discharge of a direct-current support capacitor after a switching tube on the MMC submodule is short-circuited to generate short-circuit heavy current to damage components in the submodule.
In order to solve the technical problems, the invention adopts the technical scheme that: the utility model provides a MMC half-bridge submodule piece with protect function behind last switch tube short circuit, includes switch tube, lower switch tube, with the parallelly connected bypass switch of lower switch tube, with the direct current support capacitance that last switch tube concatenated it is used for breaking off when last switch tube short circuit, the switching element that switches on when normal operating to concatenate to go up switch tube, direct current support capacitance and bypass switch and constitute in the short circuit discharge circuit of last switch tube.
Further, the switching device is connected in series in a line 1 connecting the switching tube and the dc support capacitor.
Further, the switching device is connected in series in a line 2 connecting the lower switching tube and the direct current support capacitor.
Further, the switching device is connected in series in a line 3 connecting the bypass switch and the lower switching tube.
Further, the switching device is connected in series in a line 4 connecting the bypass switch and the lower switching tube.
Further, the switching device is an IGBT.
The invention has the advantages that after the switching tube on the MMC submodule is short-circuited, the short-circuit heavy current formed by discharging of the direct-current support capacitor in the bypassed submodule can be cut off by the added switching device, so that the components are protected from being damaged by the short-circuit heavy current, the normal operation of a system is not influenced, and the invention has the characteristics of safety, reliability, simple control and no influence on other submodules.
Drawings
FIG. 1 is a schematic diagram of an MMC half-bridge sub-module;
FIG. 2 is a schematic circuit diagram of embodiment 1;
FIG. 3 is a schematic circuit diagram of embodiment 2;
FIG. 4 is a schematic circuit diagram of embodiment 3;
fig. 5 is a schematic circuit diagram of embodiment 4.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1
As shown in fig. 2, an MMC half-bridge submodule with an upper switching tube short-circuit protection function includes a dc support capacitor C1, an upper switching tube T1, a lower switching tube T2, a switching tube T3 for upper switching tube short-circuit protection, a bypass thyristor Th1, a high-speed bypass switch K1, and a voltage-sharing resistor R1, where T1 and T2 are IGBTs, and T3 is also an IGBT.
When the system is normally powered on and operated, when the half-bridge submodule charges the C1 in the positive direction (up positive and down negative), the anti-parallel diode of the switch tube T3 is conducted, and the normal operation of a half-bridge circuit is not influenced; when the half-bridge submodule charges the C1 reversely (up, down, up and positive), the switching tube T3 is conducted, and the normal operation of the half-bridge circuit is not influenced.
If the upper switch tube T1 in the submodule is short-circuited at a certain time, the controller detects the short circuit and sends a K1 closing instruction. After K1 is closed, the sub-module is bypassed, but since C1 discharges through T3, T1 and K1 loops, C1, T3, T1 and K1 form an upper switching tube short circuit discharge loop, and a short-circuit large current is generated in the loop, so that damage is caused to devices in the loop. Therefore, the T3 is used for receiving the command of the controller to turn off, cutting off the short-circuit large current, and protecting the devices in the loop. After K1 is closed, the sub-module is bypassed, and the normal operation of the system is not influenced.
In this embodiment, the switching tube T3 is an IGBT, and as another embodiment, another fully controlled device, such as an IGCT, may be used.
Example 2
As shown in fig. 3, the embodiment 2 differs from the embodiment 1 only in the position of the switch tube T3, the switch tube T3 in fig. 2 is in the connection line 1 between the dc support capacitor C1 and the upper switch tube T1; in fig. 3, the switch T3 is in the connection 2 between the dc support capacitor C1 and the lower switch T2. In this embodiment, the switch tube T3 can still cut off the short-circuit large current formed by the discharge of the dc support capacitor in the bypassed sub-module, thereby protecting the components in the discharge loop from being damaged by the short-circuit large current and not affecting the normal operation of the system.
Example 3
As shown in fig. 4, the embodiment 3 differs from the embodiment 1 only in the position of the switch tube T3, the switch tube T3 in fig. 2 is in the connection line 1 between the dc support capacitor C1 and the upper switch tube T1; in fig. 4, the switching tube T3 is in the connection line 3 between the bypass switch K1 and the collector of the lower switching tube T2. In this embodiment, the switch tube T3 can still cut off the short-circuit large current formed by the discharge of the dc support capacitor in the bypassed sub-module, thereby protecting the components in the discharge loop from being damaged by the short-circuit large current and not affecting the normal operation of the system.
Example 4
As shown in fig. 5, the embodiment 4 only differs from the embodiment 1 in the position of the switch tube T3, the switch tube T3 in fig. 2 is in the connection line 1 between the dc support capacitor C1 and the upper switch tube T1; in fig. 5, the switching tube T3 is located in the connection line 4 between the bypass switch K1 and the emitter of the lower switching tube T2. In this embodiment, the switch tube T3 can still cut off the short-circuit large current formed by the discharge of the dc support capacitor in the bypassed sub-module, thereby protecting the components in the discharge loop from being damaged by the short-circuit large current and not affecting the normal operation of the system.
The present invention has been described in relation to particular embodiments thereof, but the invention is not limited to the described embodiments. In the thought given by the present invention, the technical means in the above embodiments are changed, replaced, modified in a manner that is easily imaginable to those skilled in the art, and the functions are basically the same as the corresponding technical means in the present invention, and the purpose of the invention is basically the same, so that the technical scheme formed by fine tuning the above embodiments still falls into the protection scope of the present invention.
Claims (6)
1. The utility model provides a MMC half-bridge submodule piece with protect function behind last switch tube short circuit, includes switch tube, lower switch tube, with the parallelly connected bypass switch of lower switch tube, with the direct current support capacitance that last switch tube concatenated, its characterized in that: and a switching device which is used for being disconnected when the upper switching tube is in short circuit and being conducted when the upper switching tube is in normal operation is connected in series in an upper switching tube short circuit discharge loop consisting of the upper switching tube, the direct current support capacitor and the bypass switch.
2. The MMC half-bridge submodule with a protection function after an upper switch tube is short-circuited according to claim 1, wherein: the switching device is connected in series in a circuit 1 connecting the switching tube and the direct current support capacitor.
3. The MMC half-bridge submodule with a protection function after an upper switch tube is short-circuited according to claim 1, wherein: the switching device is connected in series in a circuit 2 connecting the lower switching tube and the direct current support capacitor.
4. The MMC half-bridge submodule with a protection function after an upper switch tube is short-circuited according to claim 1, wherein: the switching device is connected in series in a line 3 connecting the bypass switch and the collector of the lower switching tube.
5. The MMC half-bridge submodule with a protection function after an upper switch tube is short-circuited according to claim 1, wherein: the switching device is connected in series in a line 4 connecting the bypass switch and the emitter of the lower switching tube.
6. The MMC half-bridge submodule with a protection function after an upper switch tube is short-circuited according to any one of claims 1 to 5, wherein: the switching device is an IGBT.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710452745.5A CN109149974B (en) | 2017-06-15 | 2017-06-15 | MMC half-bridge submodule with upper switching tube short-circuit protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710452745.5A CN109149974B (en) | 2017-06-15 | 2017-06-15 | MMC half-bridge submodule with upper switching tube short-circuit protection function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109149974A CN109149974A (en) | 2019-01-04 |
| CN109149974B true CN109149974B (en) | 2021-02-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710452745.5A Active CN109149974B (en) | 2017-06-15 | 2017-06-15 | MMC half-bridge submodule with upper switching tube short-circuit protection function |
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Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102170110B (en) * | 2011-03-16 | 2014-01-29 | 中国电力科学研究院 | Method for protecting modularized multi-level transverter valve |
| CN104052026B (en) * | 2014-05-29 | 2016-05-25 | 华中科技大学 | For submodule topology and the application thereof of modularization multi-level converter |
| CN203911780U (en) * | 2014-06-20 | 2014-10-29 | 中国西电电气股份有限公司 | Modularized multi-level current converter power module with rapid-plugging electric connection component |
| GB2542789A (en) * | 2015-09-29 | 2017-04-05 | Alstom Technology Ltd | Fault protection for voltage source converters |
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- 2017-06-15 CN CN201710452745.5A patent/CN109149974B/en active Active
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| Publication number | Publication date |
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| CN109149974A (en) | 2019-01-04 |
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