CN104617783A - Improved structure of MMC (Modular Multilevel Converter) current converter with direct-current fault current-limiting capacity and isolating method - Google Patents
Improved structure of MMC (Modular Multilevel Converter) current converter with direct-current fault current-limiting capacity and isolating method Download PDFInfo
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- CN104617783A CN104617783A CN201410848005.XA CN201410848005A CN104617783A CN 104617783 A CN104617783 A CN 104617783A CN 201410848005 A CN201410848005 A CN 201410848005A CN 104617783 A CN104617783 A CN 104617783A
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- 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
- H02H7/125—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 rectifiers
- H02H7/1255—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 rectifiers responsive to internal faults, e.g. by monitoring ripple in output voltage
-
- 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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
Abstract
The invention discloses an improved structure of an MMC (Modular Multilevel Converter) current converter with a direct-current fault current-limiting capacity and an isolating method; the isolating method comprises the steps: setting a current-limiting module in each bridge arm of the MMC current converter; judging whether the direct-current protection sends an actuating signal; if so, judging the fault occurrence of the present direct-current system and turning off a controlled switch T; putting a current-limiting resistor R limiter into a fault loop; triggering a direct-current circuit breaker to trip; if not, enabling the direct-current system to work normally and enabling the controlled switch T of the current-limiting module in each bridge arm to be always conducted. Compared with the prior art, the invention provides an effective, practical, simple and reliable isolating method for the fault of the DC system; and the requirements on the actuating speed and the cutting capacity of the direct-current circuit breaker are reduced by means of rapid and comprehensive fault current-limiting.
Description
Technical field
The present invention relates to protecting electrical power system control field, particularly relate to a kind of DC Line Fault partition method 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 is climbed to very large flow horizontal excessively, will have a strong impact on the safe and reliable operation that whole direct current system comprises AC, DC side and converter.In order to ensure the safe and reliable operation of direct current system, requiring quick isolated fault DC line in several milliseconds of fault generation, certain failure separation method namely must be taked to isolate DC Line Fault circuit.
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.
Because fault current during DC system fault is without natural zero-crossing point, therefore DC circuit breaker is difficult to blow-out and successfully excises fault, and current jumbo DC circuit breaker is really generalized to practical engineering application and also there is certain difficulty.For this present situation, be necessary design a kind of effectively, practical and simple and reliable DC Line Fault shielding system and method, guarantee that DC circuit breaker can effectively trip and isolated fault.
Summary of the invention
For the problem that DC Line Fault isolation difficulty in current flexible direct current system is large, the present invention proposes a kind of MMC converter modified node method and partition method based on having DC Line Fault current limiting capacity.
The present invention proposes a kind of have DC Line Fault current limiting capacity based on MMC converter modified node method, 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; It is characterized in that, this system arranges current limliting module in each brachium pontis of MMC converter, and described current limliting module comprises gate-controlled switch T and sustained diode, current-limiting resistance R
limiter, connected mode is: the inverse parallel block coupled in series access converter bridge arm that gate-controlled switch 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 gate-controlled switch 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 gate-controlled switch 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;
After DC system fault occurs, according to the actuating signal shutdown switch T 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.
The invention allows for a kind of DC Line Fault partition method with the MMC converter modified node method of DC Line Fault current limiting capacity, the method comprises the following steps:
Step 1, judge whether direct current protecting sends actuating signal;
Step 2, if then current DC system fault occurs, turns off gate-controlled switch T and turns off; Current-limiting resistance R
limiterdrop into fault loop;
Step 3, the tripping operation of triggering DC circuit breaker;
Step 4, if not, then current direct current system is in normal operation, and the gate-controlled switch T of the current limliting module in each brachium pontis is in conducting state always.
Compared with prior art, the present invention, by improving the structure of MMC converter, realizes failure current limit fast after DC Line Fault occurs, and finally utilizes DC circuit breaker to excise faulty line.This method greatly reduces the responsiveness of DC circuit breaker and excision capacity requirement.And have the advantages that cost is low, added power dissipation is little.
Accompanying drawing explanation
Fig. 1 is that MMC type converter structure improves schematic diagram.
Fig. 2 is DC Line Fault partition method flow chart.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail, but practical range of the present invention is not limited thereto.
The DC Line Fault partition method of the direct current system based on modularization multi-level converter of the present invention, particular content comprises:
Certain improvement is carried out to the structure of MMC type converter, namely in each brachium pontis of MMC converter, increases current limliting module, as shown in Fig. 1 (a).Current limliting module adopts gate-controlled switch T and current-limiting resistance R
limitermode in parallel.In Fig. 1 (a): T
1, T
2and D
1, D
2be respectively igbt transistor and the fly-wheel diode of a sub-inside modules in MMC; C is the DC capacitor in submodule; T and D then represents igbt transistor in current limliting module and fly-wheel diode respectively, R
limiterfor current-limiting resistance.
When direct current system is normally run, in each brachium pontis, the gate-controlled switch T of current limliting module is in conducting state always.Now, the circulation path of bridge arm current as shown in Fig. 1 (b), i.e. current-limiting resistance R
limiterbe in the state of being bypassed always, extra power loss can not be produced to normal operation of system.
After DC Line Fault occurs, turn off gate-controlled switch T according to the actuating signal that direct current protecting sends.Current-limiting resistance R
limiterdrop into fault loop, now the circulation path of fault current is as shown in Fig. 1 (b).Fault current declines greatly by because of the input of current-limiting resistance.Then DC circuit breaker is utilized to excise faulty line.When this failure separation method makes DC Line Fault, the overcurrent impact of AC, converter and DC side is limited to allowed band.Greatly reduce the requirement to DC circuit breaker responsiveness and excision capacity, make DC circuit breaker can be utilized during DC Line Fault to excise safely and reliably and isolated fault.
Said method specific implementation flow chart as shown in Figure 2.
Claims (2)
1. have a MMC converter modified node method for 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; It is characterized in that, this system arranges current limliting module in each brachium pontis of MMC converter, and described current limliting module comprises gate-controlled switch T and sustained diode, current-limiting resistance R
limiter, connected mode is: the inverse parallel block coupled in series access converter bridge arm that gate-controlled switch 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 gate-controlled switch 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 gate-controlled switch 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;
After DC system fault occurs, turn off gate-controlled switch 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.
2., based on a DC Line Fault partition method with the MMC converter modified node method of DC Line Fault current limiting capacity according to claim 1, it is characterized in that, the method comprises the following steps:
Step (1), judge whether direct current protecting sends actuating signal;
Step (2) is if then current DC system fault occurs, the gate-controlled switch T in cut-off current-limiting module;
Current-limiting resistance R
limiterdrop into fault loop;
Step (3), the tripping operation of triggering DC circuit breaker;
Step (4), if not, then direct current system is normally run, and the gate-controlled switch T of the current limliting module in each brachium pontis is in conducting state always.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410848005.XA CN104617783A (en) | 2014-12-29 | 2014-12-29 | Improved structure of MMC (Modular Multilevel Converter) current converter with direct-current fault current-limiting capacity and isolating method |
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| CN201410848005.XA CN104617783A (en) | 2014-12-29 | 2014-12-29 | Improved structure of MMC (Modular Multilevel Converter) current converter with direct-current fault current-limiting capacity and isolating method |
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Cited By (10)
| 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 |
| CN105449704A (en) * | 2015-12-10 | 2016-03-30 | 特变电工新疆新能源股份有限公司 | Flexible direct-current power transmission system and direct-current fault processing method thereof |
| CN105490258A (en) * | 2015-12-21 | 2016-04-13 | 国网湖北省电力公司 | DC fault judgment method for flexible multi-terminal DC transmission system and control method |
| CN105914701A (en) * | 2016-05-18 | 2016-08-31 | 天津大学 | SDSM-MMC type flexible DC system DC fault reclosing method with low-current characteristic |
| CN106329899A (en) * | 2015-07-01 | 2017-01-11 | 南京南瑞继保电气有限公司 | Fault current suppression damper topology circuit, control method thereof and current converter |
| CN106532757A (en) * | 2016-11-17 | 2017-03-22 | 南方电网科学研究院有限责任公司 | Bipolar flexible direct current transmission system, converter station thereof and control method of converter station |
| CN108631633A (en) * | 2018-05-30 | 2018-10-09 | 上海海事大学 | A kind of mixing capacitance voltage type Shuangzi block coupled in series topological structure based on MMC |
| CN108964493A (en) * | 2018-08-20 | 2018-12-07 | 华北电力大学（保定） | A kind of MMC topological structure having 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 |
| CN113783448A (en) * | 2021-08-30 | 2021-12-10 | 广州智光电气技术有限公司 | Improved topological structure of modular multilevel converter MMC and converter station |
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| CN104037733A (en) * | 2014-06-03 | 2014-09-10 | 中国科学院电工研究所 | Direct current fault isolation type flexible direct current transmission converter station subelement topology |
| CN104184135A (en) * | 2014-08-29 | 2014-12-03 | 华北电力大学 | HVDC DC limiter topology |
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| 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 |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106329899A (en) * | 2015-07-01 | 2017-01-11 | 南京南瑞继保电气有限公司 | Fault current suppression damper topology circuit, control method thereof and current converter |
| CN106329899B (en) * | 2015-07-01 | 2018-10-16 | 南京南瑞继保电气有限公司 | Fault current inhibits damper topological circuit and its control method and transverter |
| 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 |
| CN105449704B (en) * | 2015-12-10 | 2018-11-02 | 特变电工新疆新能源股份有限公司 | Flexible direct-current power transmission system and direct-current fault processing method thereof |
| CN105449704A (en) * | 2015-12-10 | 2016-03-30 | 特变电工新疆新能源股份有限公司 | Flexible direct-current power transmission system and direct-current fault processing method thereof |
| CN105490258A (en) * | 2015-12-21 | 2016-04-13 | 国网湖北省电力公司 | DC fault judgment method for flexible multi-terminal DC transmission system and control method |
| CN105490258B (en) * | 2015-12-21 | 2018-12-28 | 国网湖北省电力公司 | The DC Line Fault judgment method and control method of Multi-end flexible direct current transmission system |
| CN105914701A (en) * | 2016-05-18 | 2016-08-31 | 天津大学 | SDSM-MMC type flexible DC system DC fault reclosing method with low-current characteristic |
| CN106532757A (en) * | 2016-11-17 | 2017-03-22 | 南方电网科学研究院有限责任公司 | Bipolar flexible direct current transmission system, converter station thereof and control method of converter station |
| CN108631633A (en) * | 2018-05-30 | 2018-10-09 | 上海海事大学 | A kind of mixing capacitance voltage type Shuangzi block coupled in series topological structure based on MMC |
| CN108964493A (en) * | 2018-08-20 | 2018-12-07 | 华北电力大学（保定） | A kind of MMC topological structure having 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 |
| CN113783448A (en) * | 2021-08-30 | 2021-12-10 | 广州智光电气技术有限公司 | Improved topological structure of modular multilevel converter MMC and converter station |
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