CN104617800A - Improved redundancy type MMC current converter structure having direct-current fault current-limiting capacity - Google Patents
Improved redundancy type MMC current converter structure having direct-current fault current-limiting capacity Download PDFInfo
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- CN104617800A CN104617800A CN201510050591.8A CN201510050591A CN104617800A CN 104617800 A CN104617800 A CN 104617800A CN 201510050591 A CN201510050591 A CN 201510050591A CN 104617800 A CN104617800 A CN 104617800A
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- Prior art keywords
- current
- parallel
- direct
- igbt transistor
- limiting
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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
- H02M7/42—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
- H02M7/49—Combination of the output voltage waveforms of a plurality of converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses an improved redundancy type MMC current converter structure having direct-current fault current-limiting capacity. A redundancy type current limiting module structure is arranged on each bridge arm of an MMC current converter and is formed by connecting anti-parallel structures of two groups of IGBI transistors and fly-wheel diodes in parallel and then connecting the structures with a current-limiting resistor Rlimiter in parallel. Only one IGBI transistor T1 in the current limiting module is used, and the other IGBI transistor T2 is standby under normal circumstances. Compared with the prior art, the improved redundancy type MMC current converter structure having direct-current fault current-limiting capacity aims at a direct-current fault isolation method provided by a related patient, and redundancy type improvement is conducted on the current limiting module structure so as to improve operating reliability of the improved MMC current converter.
Description
Technical field
The present invention relates to protecting electrical power system control field, particularly relate to a kind of DC Line Fault shielding system of the direct current system based on MMC converter.
Background technology
DC Line Fault isolation is the key technology of flexible direct current system development.During flexible direct current system generation DC Line Fault, fault current will be climbed to very large flow horizontal excessively.In order to ensure the safe and reliable operation of direct current system, require quick isolated fault circuit in several milliseconds of fault generation.At present, the partition method for direct current system DC Line Fault mainly contains three kinds: realize the isolation to DC Line Fault circuit by tripping AC circuit breaker during (1) DC Line Fault.The method is simple, convenient, but but there is operate time slow, power failure area causes greatly the shortcomings such as whole direct current system power supply reliability reduction.(2) converter is utilized to realize fault clearance.There is the shortcomings such as cost of investment is large, added power dissipation increase in this method.(3) utilize DC circuit breaker directly to excise faulty line, but at present can the high-capacity direct current Circuit breaker technology of quick acting (being generally several millisecond) still immature.In sum, simple and reliable DC Line Fault partition method is also lacked at present.
Patents 201410848005.X, " there is MMC converter modified node method and the partition method of DC Line Fault current limiting capacity ", propose and a kind of there is the MMC converter modified node method of DC Line Fault current limiting capacity and relevant partition method, the method is by effectively limiting direct current system fault current of AC, DC side and inverter inside when DC Line Fault, greatly reduce the harm of DC Line Fault to system, thus reduce the requirement to DC circuit breaker operate time and excision capacity.But but there is following shortcoming in this method: once power electronic device in current limliting module due to failure and other reasons out of service, whole MMC converter all will quit work, very disadvantageous during this reliability service for direct current system.
Summary of the invention
In order to overcome that above-mentioned prior art exists due to power electronic device in current limliting module out of service and cause the problem that whole converter is stopped transport, the present invention has the redundancy-type MMC converter modified node method of DC Line Fault current limiting capacity, devises a kind of parallel current limliting module modified node method with redundancy properties.
The present invention proposes a kind of redundancy-type MMC converter modified node method with DC Line Fault current limiting capacity, comprise the MMC converter be made up of multiple submodule, described submodule comprises igbt transistor T
1, T
2, sustained diode
1, D
2with DC capacitor C, connected mode is: one group of antiparallel igbt transistor T
1and sustained diode
1, organize antiparallel igbt transistor T with another
2and sustained diode
2form series connection; This cascaded structure forms in parallel with DC capacitor C again; Redundance type current limliting modular structure is set in each brachium pontis of described MMC converter, described redundance type current limliting module by parallel by the inverse parallel structure of two groups of igbt transistors and fly-wheel diode, and then with current-limiting resistance R
limiterformation in parallel; Under normal circumstances, only drop into an igbt transistor in current limliting module, another is igbt transistor for subsequent use.
Compared with prior art, the present invention is directed to the DC Line Fault partition method that Patents proposes, by carrying out redundance type improvement to current limliting modular structure, to improve the operational reliability improving rear MMC converter.
Accompanying drawing explanation
Fig. 1 is the MMC type converter modified node method schematic diagram of Patents 201410848005.X;
Fig. 2 is the current flow paths schematic diagram of Patents 201410848005.XMMC type converter modified node method;
Fig. 3 is the modified node method of the redundancy-type current limliting module that the present invention proposes.
Embodiment
Below in conjunction with the drawings and the specific embodiments, be described in further detail technical scheme of the present invention.
At Patents 201410848005.X, recite in " there is MMC converter modified node method and the partition method of DC Line Fault current limiting capacity ": by the gate-controlled switch T in cut-off current-limiting module during DC Line Fault, drop into current-limiting resistance R
limter, to realize the comprehensive current limliting to system AC, DC side and inverter inside.Thus the operate time of reducing DC circuit breaker and excision capacity requirement.This patent describe a kind of MMC converter modified node method with DC Line Fault current limiting capacity, comprise multiple MMC converter be made up of submodule, described submodule comprises igbt transistor T
1, T
2and sustained diode
1, D
2, DC capacitor C, connected mode is: the igbt transistor T of one group of parallel connection
1and sustained diode
1, organize igbt transistor T in parallel with another
2and sustained diode
2form series connection; This cascaded structure forms in parallel with DC capacitor C again; This system arranges current limliting module in each brachium pontis of MMC converter, and described current limliting module comprises igbt transistor T and sustained diode, current-limiting resistance R
limiter, connected mode is: the inverse parallel block coupled in series access converter bridge arm that igbt transistor T and sustained diode are formed, and the gate-controlled switch that closure and MMC have submodule inside is contrary with diode inverse parallel module direction; Again with current-limiting resistance R
limiterin parallel;
Described current limliting module has normal operating condition and failure current limit state two kinds of operating states;
Wherein, when direct current system is normally run, the igbt transistor T of the current limliting module in each brachium pontis is in conducting state always; Now the circulation path of bridge arm current in current limliting module is: the igbt transistor T in current limliting module or sustained diode, specifically depending on bridge arm current direction; Current-limiting resistance is in the state of being bypassed always.This state is called the normal operating condition of current limliting module.
After DC system fault occurs, turn off igbt transistor T according to the actuating signal that direct current protecting sends; Now fault current can only flow through current-limiting resistance in current limliting module, and namely current-limiting resistance is put in fault loop.This state is called the failure current limit state of current limliting module.
But the current electrons device of this current limliting module in failure current limit time limit flow module may the breakdown damage because of the excessive drop on current-limiting resistance.
Therefore, the present invention's design proposes a kind of modified node method of current limliting module, and to improve the operational reliability improving rear MMC converter, concrete scheme is as follows:
Adopt the parallel redundancy formula current limliting modular structure shown in Fig. 3, redundance type current limliting modular structure by the inverse parallel structure of two groups of igbt transistors and fly-wheel diode in parallel and then with line resistance R
limiterformation in parallel.。
Under normal circumstances, an igbt transistor T in current limliting module is only dropped into
1, once the igbt transistor T under being in the state of putting into operation
1out of service due to reasons such as faults itselfs, drop into igbt transistor T for subsequent use immediately
2.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from this patent principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (1)
1. have a redundancy-type MMC converter modified node method for DC Line Fault current limiting capacity, comprise the MMC converter be made up of multiple submodule, described submodule comprises igbt transistor T
1, T
2, sustained diode
1, D
2with DC capacitor C, connected mode is: one group of antiparallel igbt transistor T
1and sustained diode
1, organize antiparallel igbt transistor T with another
2and sustained diode
2form series connection; This cascaded structure forms in parallel with DC capacitor C again; It is characterized in that, arrange redundance type current limliting modular structure in each brachium pontis of described MMC converter, described redundance type current limliting modular structure is in parallel by the inverse parallel structure of two groups of igbt transistors and fly-wheel diode, and then with current-limiting resistance R
limiterformation in parallel; Under normal circumstances, only drop into an igbt transistor in current limliting module, another is igbt transistor for subsequent use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510050591.8A CN104617800A (en) | 2015-01-30 | 2015-01-30 | Improved redundancy type MMC current converter structure having direct-current fault current-limiting capacity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510050591.8A CN104617800A (en) | 2015-01-30 | 2015-01-30 | Improved redundancy type MMC current converter structure having direct-current fault current-limiting capacity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104617800A true CN104617800A (en) | 2015-05-13 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510050591.8A Pending CN104617800A (en) | 2015-01-30 | 2015-01-30 | Improved redundancy type MMC current converter structure having direct-current fault current-limiting capacity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104617800A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104953571A (en) * | 2015-07-03 | 2015-09-30 | 天津大学 | Improved MMC (modular multi-level converter) structure with direct current fault clearing capacity |
| CN111313407A (en) * | 2020-03-03 | 2020-06-19 | 华北电力大学 | UPFC fault transition device and method based on additional damping resistor |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5999388A (en) * | 1997-03-24 | 1999-12-07 | Asea Brown Boveri Ab | Method and apparatus for limiting current in a direct voltage network of a power transmission system |
| CN201063549Y (en) * | 2007-04-25 | 2008-05-21 | 三垦力达电气(江阴)有限公司 | DC power supply redundant apparatus of high voltage frequency converter |
| CN102931863A (en) * | 2012-11-12 | 2013-02-13 | 华北电力大学 | Method for setting up modularized multi-level converter composite structure model |
| CN103199725A (en) * | 2013-04-27 | 2013-07-10 | 东南大学 | MMC (modular multilevel converter) circular current restrain strategy based on parallel resonance |
| CN203859676U (en) * | 2014-05-29 | 2014-10-01 | 国家电网公司 | Power unit module of power electronic converter |
-
2015
- 2015-01-30 CN CN201510050591.8A patent/CN104617800A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5999388A (en) * | 1997-03-24 | 1999-12-07 | Asea Brown Boveri Ab | Method and apparatus for limiting current in a direct voltage network of a power transmission system |
| CN201063549Y (en) * | 2007-04-25 | 2008-05-21 | 三垦力达电气(江阴)有限公司 | DC power supply redundant apparatus of high voltage frequency converter |
| CN102931863A (en) * | 2012-11-12 | 2013-02-13 | 华北电力大学 | Method for setting up modularized multi-level converter composite structure model |
| CN103199725A (en) * | 2013-04-27 | 2013-07-10 | 东南大学 | MMC (modular multilevel converter) circular current restrain strategy based on parallel resonance |
| CN203859676U (en) * | 2014-05-29 | 2014-10-01 | 国家电网公司 | Power unit module of power electronic converter |
Non-Patent Citations (1)
| Title |
|---|
| 胡竞竞 等: "直流配电系统保护技术研究综述", 《电网技术》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104953571A (en) * | 2015-07-03 | 2015-09-30 | 天津大学 | Improved MMC (modular multi-level converter) structure with direct current fault clearing capacity |
| CN104953571B (en) * | 2015-07-03 | 2018-03-02 | 天津大学 | A kind of modularization multi-level converter improved structure with DC Line Fault Scavenging activity |
| CN111313407A (en) * | 2020-03-03 | 2020-06-19 | 华北电力大学 | UPFC fault transition device and method based on additional damping resistor |
| CN111313407B (en) * | 2020-03-03 | 2021-09-10 | 华北电力大学 | UPFC fault transition device and method based on additional damping resistor |
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