CN109149974A - The MMC half-bridge submodule of defencive function after a kind of tube short circuit with upper switch - Google Patents
The MMC half-bridge submodule of defencive function after a kind of tube short circuit with upper switch Download PDFInfo
- Publication number
- CN109149974A CN109149974A CN201710452745.5A CN201710452745A CN109149974A CN 109149974 A CN109149974 A CN 109149974A CN 201710452745 A CN201710452745 A CN 201710452745A CN 109149974 A CN109149974 A CN 109149974A
- Authority
- CN
- China
- Prior art keywords
- upper switch
- short circuit
- submodule
- switch
- defencive function
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Direct Current Feeding And Distribution (AREA)
- Protection Of Static Devices (AREA)
Abstract
The present invention relates to high-voltage dc transmission electrical domains; provide a kind of MMC half-bridge submodule of defencive function after the tube short circuit with upper switch; by the way that a switching device is added in the submodule that is bypassed after submodule upper switch tube short circuit; it solves the problems, such as to realize the self-protection function of submodule since the capacitor Short-Circuit High Current to be formed of discharging damages this to component in submodule after submodule is bypassed.
Description
Technical field
The present invention relates to high-voltage dc transmission electrical domains, and in particular to defencive function after a kind of tube short circuit with upper switch
MMC half-bridge submodule.
Background technique
In MMC flexible direct-current power transmission engineering operational process, each bridge arm of MMC flexible direct-current current transmission valve is usually by several
Hundred MMC flexible direct-current transmission of electricity submodule concatenations as shown in Figure 1 are constituted, and wherein OUT1, OUT2 are the output ends of MMC submodule
Mouthful, for connecting with adjacent MMC submodule, T1 is upper switch pipe, and T2 is lower switch pipe, and K1 is by-pass switch, and C1 is direct current
Support Capacitor.
When breaking down in MMC submodule, closure by-pass switch K1 is to bypass MMC submodule.When being lower switch pipe
When T2 short circuit, C1, T1, K1 (T2) will form short circuit dischange circuit, can be by controlling T1 at this time since T1 is still controllable
Discharge loop is disconnected, destruction of the C1 electric discharge to element in discharge loop is avoided.When upper switch pipe T1 short circuit, it is closed by-pass switch
K1 cuts off rapidly short-circuit submodule, and system is made to maintain operation, but due to straight in short-circuit submodule after by-pass switch K1 closure
Support Capacitor electric discharge is flowed, short circuit current can be generated in the discharge loop that K1, T1 and C1 are formed, short circuit current reaches hundreds of kilo-amperes,
So big electric current will cause connection busbar, K1 internal element, DC support capacitor internal element etc. badly damaged, and consequence is not
It may imagine.
Summary of the invention
The present invention provides a kind of MMC half-bridge submodule of defencive function after tube short circuit with upper switch, to solve by
Discharge loop generation short circuit is formed greatly since DC support capacitor discharges in submodule after MMC submodule upper switch tube short circuit
Electric current damages this problem to component in submodule.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: one kind is protected after having upper switch tube short circuit
The MMC half-bridge submodule of function, including upper switch pipe, lower switch pipe, the by-pass switch in parallel with lower switch pipe and upper switch pipe
The DC support capacitor of concatenation is put in the upper switch tube short circuit of the upper switch pipe, DC support capacitor and by-pass switch composition
The switching device be connected when being serially connected with one in electrical circuit for disconnecting, operating normally in upper switch tube short circuit.
Further, the switching device is serially connected in the route 1 of connection upper switch pipe and DC support capacitor.
Further, the switching device is serially connected in the route 2 of connection lower switch pipe and DC support capacitor.
Further, the switching device is serially connected in the route 3 of connection by-pass switch and lower switch pipe.
Further, the switching device is serially connected in the route 4 of connection by-pass switch and lower switch pipe.
Further, the switching device is IGBT.
The beneficial effects of the invention are as follows after MMC submodule upper switch tube short circuit, can be cut by increased switching device
Since DC support capacitor discharges the Short-Circuit High Current to be formed in the disconnected submodule bypassed, so that component be protected not to be short-circuited
High current damage, while system normal operation is not influenced, with safe and reliable, control is simple and will not cause to other submodules
The characteristics of influence.
Detailed description of the invention
Fig. 1 is MMC half-bridge submodule schematic diagram；
Fig. 2 is the circuit diagram of embodiment 1；
Fig. 3 is the circuit diagram of embodiment 2；
Fig. 4 is the circuit diagram of embodiment 3；
Fig. 5 is the circuit diagram of embodiment 4.
Specific embodiment
The present invention will be further described in detail with reference to the accompanying drawing.
Embodiment 1
As shown in Fig. 2, after a kind of tube short circuit with upper switch defencive function MMC half-bridge submodule, including DC support
Capacitor C1, upper switch pipe T1, lower switch pipe T2, the switch transistor T 3 for the protection of upper switch tube short circuit, bypass thyristor Th1, height
Fast by-pass switch K1, equalizing resistance R1, wherein T1 and T2 is IGBT, and T3 is also IGBT.
System normally upper electricity operation when, when half-bridge submodule is positive (on the just lower negative) charging of C1, switch transistor T 3 it is anti-
Parallel diode conducting does not influence half-bridge circuit normal operation；When half-bridge submodule is C1 reversely (under above bearing just) charging, open
Pipe T3 conducting is closed, half-bridge circuit normal operation is nor affected on.
If short circuit occurs for upper switch pipe T1 in a certain moment submodule, controller, which detects short circuit and sends K1 closure, to be referred to
It enables.After K1 closure, submodule is bypassed, but since C1 is by the electric discharge of the circuit T3, T1 and K1, C1, T3, T1 and K1 form one
Upper switch tube short circuit discharge loop generates Short-Circuit High Current in circuit, damages to device in circuit.Therefore, it is connect by T3
It is instructed and is turned off by controller, Short-Circuit High Current is cut off, thus the device in protective loop.Submodule is bypassed after K1 closure, no
Influence system operates normally.
Switch transistor T 3 uses IGBT in the present embodiment, as other embodiments, can also use other full-controlled devices,
Such as IGCT etc..
Embodiment 2
As shown in figure 3, the difference of embodiment 2 and embodiment 1 is only that the position of switch transistor T 3, in Fig. 2 at switch transistor T 3
In the connection line 1 of DC support capacitor C1 and upper switch pipe T1；In Fig. 3, switch transistor T 3 be in DC support capacitor C1 with
In the connection line 2 of lower switch pipe T2.Switch transistor T 3 still is able in the submodule that cutting bypasses due to direct current in the present embodiment
Support Capacitor discharges the Short-Circuit High Current to be formed, to protect component in discharge loop not to be short-circuited high current damage, simultaneously
System normal operation is not influenced.
Embodiment 3
As shown in figure 4, the difference of embodiment 3 and embodiment 1 is only that the position of switch transistor T 3, in Fig. 2 at switch transistor T 3
In the connection line 1 of DC support capacitor C1 and upper switch pipe T1；In Fig. 4, switch transistor T 3 is in by-pass switch K1 and opens under
It closes in the connection line 3 between pipe T2 collector.In the present embodiment switch transistor T 3 still be able in the submodule that bypasses of cutting by
It discharges the Short-Circuit High Current to be formed in DC support capacitor, so that component in discharge loop be protected not to be short-circuited high current damage
It is bad, while system normal operation is not influenced.
Embodiment 4
As shown in figure 5, the difference of embodiment 4 and embodiment 1 is only that the position of switch transistor T 3, in Fig. 2 at switch transistor T 3
In the connection line 1 of DC support capacitor C1 and upper switch pipe T1；In Fig. 5, switch transistor T 3 is in by-pass switch K1 and opens under
In the connection line 4 for closing pipe T2 emitter.Switch transistor T 3 still is able in the submodule that cutting bypasses due to straight in the present embodiment
Stream Support Capacitor discharges the Short-Circuit High Current to be formed, to protect component in discharge loop not to be short-circuited high current damage, together
When do not influence system normal operation.
Specific embodiment of the present invention is presented above, but the present invention is not limited to described embodiment.
Under the thinking that the present invention provides, to the skill in above-described embodiment by the way of being readily apparent that those skilled in the art
Art means are converted, are replaced, are modified, and play the role of with the present invention in relevant art means it is essentially identical, realize
Goal of the invention it is also essentially identical, the technical solution formed in this way is to be finely adjusted to be formed to above-described embodiment, this technology
Scheme is still fallen in protection scope of the present invention.
Claims (6)
1. the MMC half-bridge submodule of defencive function after a kind of tube short circuit with upper switch, including upper switch pipe, lower switch pipe, with
The by-pass switch of lower switch pipe parallel connection, the DC support capacitor concatenated with upper switch pipe, it is characterised in that: in the upper switch
One is serially connected in the upper switch tube short circuit discharge loop of pipe, DC support capacitor and by-pass switch composition in upper switch pipe
The switching device be connected when disconnecting, operating normally when short-circuit.
2. according to claim 1 after a kind of tube short circuit with upper switch defencive function MMC half-bridge submodule, feature exists
In: the switching device is serially connected in the route (1) of connection upper switch pipe and DC support capacitor.
3. according to claim 1 after a kind of tube short circuit with upper switch defencive function MMC half-bridge submodule, feature exists
In: the switching device is serially connected in the route (2) of connection lower switch pipe and DC support capacitor.
4. according to claim 1 after a kind of tube short circuit with upper switch defencive function MMC half-bridge submodule, feature exists
In: the switching device is serially connected in the route (3) of connection by-pass switch and lower switch pipe.
5. according to claim 1 after a kind of tube short circuit with upper switch defencive function MMC half-bridge submodule, feature exists
In: the switching device is serially connected in the route (4) of connection by-pass switch and lower switch pipe.
6. according to claim 1 to the MMC half-bridge submodule of defencive function after a kind of any one of 5 tube short circuits with upper switch
Block, it is characterised in that: the switching device is 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 true CN109149974A (en) | 2019-01-04 |
| CN109149974B CN109149974B (en) | 2021-02-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| 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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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102170110A (en) * | 2011-03-16 | 2011-08-31 | 中国电力科学研究院 | Method for protecting modularized multi-level transverter valve |
| CN104052026A (en) * | 2014-05-29 | 2014-09-17 | 华中科技大学 | Submodule topology for modular multi-level transverter and application of modular multi-level transverter |
| 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 |
-
2017
- 2017-06-15 CN CN201710452745.5A patent/CN109149974B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102170110A (en) * | 2011-03-16 | 2011-08-31 | 中国电力科学研究院 | Method for protecting modularized multi-level transverter valve |
| CN104052026A (en) * | 2014-05-29 | 2014-09-17 | 华中科技大学 | Submodule topology for modular multi-level transverter and application of modular multi-level transverter |
| 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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| Publication number | Publication date |
|---|---|
| CN109149974B (en) | 2021-02-05 |
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