CN105914701A - SDSM-MMC type flexible DC system DC fault reclosing method with low-current characteristic - Google Patents
SDSM-MMC type flexible DC system DC fault reclosing method with low-current characteristic Download PDFInfo
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- CN105914701A CN105914701A CN201610330625.3A CN201610330625A CN105914701A CN 105914701 A CN105914701 A CN 105914701A CN 201610330625 A CN201610330625 A CN 201610330625A CN 105914701 A CN105914701 A CN 105914701A
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- sdsm
- fault
- current
- bridge
- mmc
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
-
- 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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Abstract
The invention discloses an SDSM-MMC type flexible DC system DC fault reclosing method with low-current characteristics. The SDSM-MMC type flexible DC system DC fault reclosing method comprises the steps of: removing a DC fault current by locking a current converter, and completing de-ionization; then putting all SDSM submodules into a quasi-half-bridge locking mode; utilizing the SDSM quasi-half-bridge locking mode to implement an operating method of an SDSM-MMC uncontrolled rectifier bridge; indicating that a fault still exists if current occurs in a DC circuit again, judging the fault to be a permanent fault, and locking the current converter immediately. Compared with the prior art, the SDSM-MMC type flexible DC system DC fault reclosing method can realize the reclosing judgment just by judging whether the current exists or not, if the current converter is reclosed at the permanent fault, the current converter can be relocked quickly under the condition of very small circuit current, the secondary overcurrent impact of reclosing on the system is effectively avoided, and the SDSM-MMC type flexible DC system DC fault reclosing method has a positive effect of low current hazards.
Description
Technical field
The present invention relates to protecting electrical power system control field, particularly relate to a kind of flexible direct current power transmission system DC Line Fault weight
Closing switch method.
Background technology
The flexible DC power transmission utilizing overhead transmission line to transmit electricity is one of efficient implementation of following high-capacity direct current transmission of electricity.Frame
In the case of empty multi-line power transmission, DC Line Fault rate is greatly improved, utilization series connection Shuangzi module (series double sub-module,
SDSM) formula MMC (SDSM-MMC) replaces traditional semibridge system MMC to be capable of the most clear of fault current
Remove.Additionally, overhead transmission line transient fault probability is relatively big, therefore need to design suitable fault reclosing strategy.Existing
Reclosing strategy is mainly after system in a period of time goes free process, unlocks current conversion station under zero energy pattern, logical
Cross and judge whether that can set up DC voltage realizes the interpretation to fault presence or absence.But, this method is with Voltage Establishment
Whether as criterion, if the permanent fault of coinciding with, quick owing to electric capacity discharges can cross stream, cause secondary to endanger system
Evil.For this problem, it is necessary to be designed to effectively reduce secondary system and cross the reclosing method of stream harm.
Summary of the invention
Electric current secondary can be caused to cross the problem of stream harm for current flexible direct current system fault reclosing strategy, the present invention carries
It has a kind of SDSM-MMC type flexible direct current system direct current fault reclosing method of low current characteristic, it is achieved that for
SDSM-MMC type flexible direct current power transmission system, have low current harm fault reclosing method.
The SDSM-MMC type flexible direct current system direct current fault reclosing method of a kind of low current characteristic of the present invention, should
Method comprises the following steps:
Step 1, utilize SDSM inverter to remove direct fault current, and complete to dissociate；
Step 2, all SDSM inverters are put into SDSM class half-bridge non-blocking mode；
Step 3, SDSM class half-bridge non-blocking mode is utilized to realize the SDSM-MMC uncontrollable rectifier bridge method of operation；
Step 4, judge that DC line occurs that electric current carrys out failure judgement and yet suffers from or disappeared the most again；
If electric current no longer occurs in step 5 DC line, then show that fault has disappeared, then enter system reboot and run
Pattern, recovers properly functioning under restarting control strategy；
If step 6 DC line occurs electric current again, then show that fault yet suffers from, it is determined that for permanent fault, stand
I.e. locking full-bridge submodule inverter.
SDSM class half-bridge non-blocking mode in described step (2) includes two kinds of implementations: implementation one, accordingly
Class half-bridge non-blocking mode one turn on IGBT T5, T1～T4 keep blocking, now fault current is through fly-wheel diode
D2, D4 and IGBT T5 circulates；Implementation two, corresponding SDSM class half-bridge non-blocking mode two turns on IGBT T1
And T3, T2, T4 and T5 keep blocking, and now fault current is through sustained diode 6, IGBT T1 and T3
Circulation.
The described SDSM-MMC uncontrollable rectifier bridge method of operation includes that two kinds of SDSM class half-bridge non-blocking mode realize respectively
The three-phase commutation bridge that mode is constituted.
Directly unlock with tradition inverter based on compared with Voltage Establishment whether reclosing strategy, the present invention is coinciding with forever
Electric capacity electric discharge is avoided for a long time during property fault, and owing to electric current presence or absence only need to be judged, therefore can be at the least circuit
Under current conditions, quick locking inverter the most again, is not result in that the secondary of system crosses stream, effectively prevent reclosing to system
The secondary caused crosses stream impact.
Accompanying drawing explanation
Fig. 1 is SDSM class half-bridge non-blocking mode circuit diagram, (a), implementation one；(b), implementation two；
Fig. 2 is SDSM-MMC uncontrollable rectifier method of operation schematic diagram, (a), based on class half-bridge non-blocking mode realize
The SDSM-MMC uncontrollable rectifier method of operation one that mode one is constituted；(b), based on class half-bridge non-blocking mode realization side
Formula two constitutes the SDSM-MMC uncontrollable rectifier method of operation two；
Fig. 3 is a kind of DC Line Fault reclosing method for SDSM-MMC type flexible direct current power transmission system of the present invention
Overall flow figure.
Detailed description of the invention
For SDSM topological structure feature, present invention design propose respectively a kind of novel submodule operational mode with
And the corresponding inverter uncontrollable rectifier method of operation, and devise a kind of fault reclosing plan with low current harm accordingly
Slightly, particular content includes:
For SDSM topological structure feature, proposing corresponding novel submodule operational mode, the present invention is by this operation mould
Formula is referred to as class half-bridge non-blocking mode.As Fig. 1 (a) show class half-bridge non-blocking mode implementation one, conducting Fig. 1 (a)
In IGBT T5, T1～T4 keep blocking, now fault current is only possible to through sustained diode 2, D4 and IGBT
T5 circulates, and it is identical that its physical characteristic touches block with half-bridge under blocking, the most named class half-bridge non-blocking mode；
As Fig. 1 (b) show class half-bridge non-blocking mode implementation two, IGBT T1 and T3, T2 in conducting Fig. 1 (b),
T4 and T5 keeps blocking, and now fault current is only possible to through sustained diode 6, IGBT T1 and T3 circulation,
It is identical that physical characteristic also touches block with half-bridge under blocking.
According to SDSM two kinds of implementations of class half-bridge non-blocking mode, respective design as shown in Figure 2 two kinds
The SDSM-MMC uncontrollable rectifier method of operation.Under this operational mode, inverter is equivalent to a uncontrollable rectifier bridge.
As it is shown on figure 3, a kind of direct current event for SDSM-MMC type flexible direct current power transmission system proposed for the present invention
The overall flow of barrier reclosing method, comprises the following steps:
Utilize SDSM-MMC to remove direct fault current, and complete free process, step 1；By all SDSM
Put into class half-bridge non-blocking mode, step 2；Class half-bridge non-blocking mode realizes SDSM-MMC uncontrollable rectifier bridge operation side
Formula, step 3；By judging that DC line occurs that electric current carrys out failure judgement and yet suffers from or disappeared (i.e. the most again
In the case of not considering measurement error, it is judged that the electric current I of DC linedcWhether equal to 0), step 4；If electric current Idc=0,
Show that electric current no longer occurs in DC line, then fault has disappeared, and enters system reboot operational mode, is restarting control plan
Slightly lower recovery is properly functioning, step 5；Otherwise, if electric current IdC ≠ 0, then show that DC line occurs electric current again, then
Fault yet suffers from, it is determined that for permanent fault, immediately locking inverter, step 6.
Claims (3)
1. a SDSM-MMC type flexible direct current system direct current fault reclosing method for low current characteristic, its feature
Being, the method comprises the following steps:
Step (1), utilize SDSM inverter to remove direct fault current, and complete to dissociate；
Step (2), all SDSM inverters are put into SDSM class half-bridge non-blocking mode；
Step (3), SDSM class half-bridge non-blocking mode is utilized to realize the SDSM-MMC uncontrollable rectifier bridge method of operation；
Step (4), judge that DC line occurs that electric current carrys out failure judgement and yet suffers from or disappeared the most again；
Step (5) if electric current no longer occurs in DC line, then shows that fault has disappeared, then enter system reboot
Operational mode, recovers properly functioning under restarting control strategy；
Step (6) if DC line occurs electric current again, then shows that fault yet suffers from, it is determined that for permanent fault,
Locking full-bridge submodule inverter immediately.
2. the SDSM-MMC type flexible direct current system direct current fault of low current characteristic as claimed in claim 1 overlaps
Lock method, it is characterised in that the SDSM class half-bridge non-blocking mode in described step (2) includes two kinds of implementations:
Implementation one, corresponding class half-bridge non-blocking mode one turns on IGBT T5, T1～T4 and keeps blocking, now fault
Electric current is through sustained diode 2, D4 and IGBT T5 circulation；Implementation two, corresponding SDSM class half-bridge locking
Pattern two turns on IGBT T1 and T3, and T2, T4 and T5 keep blocking, and now fault current is through fly-wheel diode
D6, IGBT T1 and T3 circulates.
3. the SDSM-MMC type flexible direct current system direct current fault of low current characteristic as claimed in claim 1 overlaps
Lock method, it is characterised in that the described SDSM-MMC uncontrollable rectifier bridge method of operation includes two kinds of SDSM classes respectively
The three-phase commutation bridge that half-bridge non-blocking mode implementation is constituted.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610330625.3A CN105914701A (en) | 2016-05-18 | 2016-05-18 | SDSM-MMC type flexible DC system DC fault reclosing method with low-current characteristic |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610330625.3A CN105914701A (en) | 2016-05-18 | 2016-05-18 | SDSM-MMC type flexible DC system DC fault reclosing method with low-current characteristic |
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| CN201610330625.3A Pending CN105914701A (en) | 2016-05-18 | 2016-05-18 | SDSM-MMC type flexible DC system DC fault reclosing method with low-current characteristic |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111817269A (en) * | 2020-06-17 | 2020-10-23 | 清华大学 | Fault processing method and device and power grid commutation high-voltage direct-current transmission system |
| CN111817267A (en) * | 2020-06-17 | 2020-10-23 | 清华大学 | Fault processing method and device and flexible direct current transmission system |
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| CN104638615A (en) * | 2015-02-16 | 2015-05-20 | 天津大学 | Modular multilevel converter with direct-current fault isolation function and submodule thereof |
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2016
- 2016-05-18 CN CN201610330625.3A patent/CN105914701A/en active Pending
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| CN102570423A (en) * | 2012-01-19 | 2012-07-11 | 天津大学 | Crossover line permanent fault recognizing method for double circuit lines on same tower |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111817269A (en) * | 2020-06-17 | 2020-10-23 | 清华大学 | Fault processing method and device and power grid commutation high-voltage direct-current transmission system |
| CN111817267A (en) * | 2020-06-17 | 2020-10-23 | 清华大学 | Fault processing method and device and flexible direct current transmission system |
| CN111817269B (en) * | 2020-06-17 | 2022-04-05 | 清华大学 | Fault processing method and device and power grid commutation high-voltage direct-current transmission system |
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Application publication date: 20160831 |