CN106026007A - DC fault reclosing strategy for flexible DC power transmission system - Google Patents
DC fault reclosing strategy for flexible DC power transmission system Download PDFInfo
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- CN106026007A CN106026007A CN201610329988.5A CN201610329988A CN106026007A CN 106026007 A CN106026007 A CN 106026007A CN 201610329988 A CN201610329988 A CN 201610329988A CN 106026007 A CN106026007 A CN 106026007A
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- fault
- sbsm
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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
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- Direct Current Feeding And Distribution (AREA)
Abstract
The invention discloses a DC fault reclosing strategy for a flexible DC power transmission system, and the strategy comprises the steps: removing a DC fault current through locking a current converter, and completing the deionization; enabling all SBSMs to be put into a half-bridge-like locked mode; implementing an SBSM-MMC non-control rectifier bridge operation mode through employing the half-bridge-like locked mode of the SBSMs; judging that a fault disappears if a DC line does not have a current, entering a system restart operation mode, and restoring the normal operation under a restart control strategy; judging that the fault still exists if a current appears in the DC line again, judging that the fault is a permanent fault, and instantly locking the current converter. Compared with the prior art, the method can make the reclosing judgment through judging whether there is a current or not. When the fault is the permanent fault, the method can quickly lock the current converter again under the condition of a very small line current, effectively prevents the reclosing from causing the secondary overcurrent impact on a system, and is small in current damages.
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, and utilizes and strengthens from resistance type submodule (self-blocking
Sub-module, SBSM) formula MMC (SBSM-MMC) replaces traditional semibridge system MMC to be capable of fault
The quick removing of electric current.Additionally, overhead transmission line transient fault probability is relatively big, therefore need to design suitable fault reclosing
Strategy.After the current existing fault reclosing strategy system in a period of time goes free process, under zero energy pattern
Unlock current conversion station, by judging whether that can set up DC voltage realizes the interpretation to fault presence or absence, by judging energy
No DC voltage of setting up comes whether failure judgement yet suffers from.But, this method using Voltage Establishment whether as criterion,
If system can be produced due to the secondary discharge of electric capacity secondary when coinciding with permanent fault cross stream impact harm to being
System causes secondary to endanger.For this problem, it is necessary to be designed to effectively reduce secondary system and cross the reclosing of stream harm
Method.
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
Go out a kind of flexible direct current power transmission system DC Line Fault reclosing strategy, it is achieved that for SBSM-MMC type flexible direct current
Transmission system, have low current harm DC Line Fault reclosing method.
A kind of flexible direct current power transmission system DC Line Fault reclosing strategy the method for the present invention comprises the following steps:
Step 1, utilize SBSM inverter to remove direct fault current, and complete to dissociate；
Step 2, all SBSM inverters are put into SBSM class half-bridge non-blocking mode；
Step 3, SBSM class half-bridge non-blocking mode is utilized to realize the SBSM-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 SBSM inverter.
SBSM class half-bridge non-blocking mode in described step (2) includes two kinds of implementations: implementation one, accordingly
SBSM class half-bridge non-blocking mode one turn on IGBT T3, locking T1～T2, now fault current is through fly-wheel diode
D2 and IGBT T3 circulates；Implementation two, corresponding SBSM class half-bridge non-blocking mode two turns on IGBT T3,
Locking T1～T2, now fault current circulates through sustained diode 1 and IGBT T3.
The described DSM-MMC uncontrollable rectifier bridge method of operation includes two kinds of SBSM class half-bridge non-blocking mode realization sides respectively
The three-phase commutation bridge that formula 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 SBSM class half-bridge non-blocking mode circuit diagram, (a), implementation one；(b), implementation two；
Fig. 2 is SBSM-MMC uncontrollable rectifier method of operation schematic diagram, (a), based on class half-bridge non-blocking mode realize
The SBSM-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 SBSM-MMC uncontrollable rectifier method of operation two；
Fig. 3 is a kind of DC Line Fault reclosing method for SBSM-MMC type flexible direct current power transmission system of the present invention
Overall flow figure.
Detailed description of the invention
For two kinds of topological structure features of SBSM, present invention design proposes a kind of novel submodule respectively and runs mould
Formula and the corresponding inverter uncontrollable rectifier method of operation, and devise a kind of fault coincidence with low current harm accordingly
Lock strategy, particular content includes:
For SBSM topological structure feature, proposing corresponding novel submodule operational mode, the present invention is by this operational mode
It is referred to as class half-bridge non-blocking mode.As Fig. 1 (a) show class half-bridge non-blocking mode implementation one, turn on IGBT T3,
Locking T1～T2.Now fault current be only possible to through sustained diode 2 and IGBT T3 circulate, its physical characteristic with close
It is identical that half-bridge under lock status touches block, the most named class half-bridge non-blocking mode.As Fig. 1 (b) show class half-bridge
Non-blocking mode implementation two, turns on IGBT T3, locking T1～T2.Now fault current is only possible to through fly-wheel diode
D1 and IGBT T3 circulates, and it is identical that its physical characteristic also touches block with half-bridge under blocking.
Utilize two kinds of implementations of SBSM class half-bridge non-blocking mode, respective design as shown in Figure 2 two kinds
The SBSM-MMC uncontrollable rectifier method of operation.Under this method of operation, inverter is equivalent to a uncontrollable rectifier device.
As it is shown on figure 3, be the overall flow of a kind of flexible direct current power transmission system DC Line Fault reclosing strategy of the present invention,
Comprise the following steps:
Utilize SBSM-MMC to remove direct fault current, and experience a period of time until completing free process, step
1；All SBSM are put into class half-bridge non-blocking mode, step 2；Class half-bridge non-blocking mode realizes SBSM-MMC
The uncontrollable rectifier bridge method of operation, step 3；By judging that DC line occurs that electric current carrys out failure judgement and still deposits the most again
Or disappeared (i.e. 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, fault has disappeared, and enters system reboot and runs
Pattern, recovers properly functioning, step 5 under restarting control strategy；Otherwise, if electric current IdC ≠ 0, then show AC line
Road occurs that electric current, i.e. fault yet suffer from again, it is determined that for permanent fault, immediately locking inverter, step 6.
Claims (3)
1. a flexible direct current power transmission system DC Line Fault reclosing strategy, it is characterised in that the method includes following step
Rapid:
Step (1), utilize SBSM inverter to remove direct fault current, and complete to dissociate；
Step (2), all SBSM inverters are put into SBSM class half-bridge non-blocking mode；
Step (3), SBSM class half-bridge non-blocking mode is utilized to realize the SBSM-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 SBSM inverter immediately.
2. flexible direct current power transmission system DC Line Fault reclosing strategy as claimed in claim 1, it is characterised in that institute
State the SBSM class half-bridge non-blocking mode in step (2) and include two kinds of implementations: implementation one, corresponding SBSM
Class half-bridge non-blocking mode one turns on IGBT T3, locking T1～T2, and now fault current is through sustained diode 2 and IGBT
T3 circulates；Implementation two, corresponding SBSM class half-bridge non-blocking mode two turns on IGBT T3, locking T1～T2,
Now fault current circulates through sustained diode 1 and IGBT T3.
3. flexible direct current power transmission system DC Line Fault reclosing strategy as claimed in claim 1, it is characterised in that institute
State the SBSM-MMC uncontrollable rectifier bridge method of operation and include that two kinds of SBSM class half-bridge non-blocking mode implementations are constituted respectively
Three-phase commutation bridge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610329988.5A CN106026007A (en) | 2016-05-18 | 2016-05-18 | DC fault reclosing strategy for flexible DC power transmission system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610329988.5A CN106026007A (en) | 2016-05-18 | 2016-05-18 | DC fault reclosing strategy for flexible DC power transmission system |
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| CN106026007A true CN106026007A (en) | 2016-10-12 |
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| CN201610329988.5A Pending CN106026007A (en) | 2016-05-18 | 2016-05-18 | DC fault reclosing strategy for flexible DC power transmission system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108400575A (en) * | 2018-03-19 | 2018-08-14 | 西安交通大学 | The DC line fault guard method of characteristic signal is injected based on transverter |
| CN108551161A (en) * | 2018-03-20 | 2018-09-18 | 西安交通大学 | Utilize the transverter DC line fault guard method that actively injection and traveling wave couple |
| CN108988303A (en) * | 2018-07-19 | 2018-12-11 | 西安交通大学 | Utilize the adaptive reclosing method of MMC-HVDC DC line of breaker injected pulse signal |
| CN109462215A (en) * | 2018-10-25 | 2019-03-12 | 许继集团有限公司 | A kind of Polynuclear complex system dc line fault sweep-out method and device |
| CN109728594A (en) * | 2018-12-19 | 2019-05-07 | 华北电力大学 | A kind of DC Line Fault traversing control method of hybrid converter station |
| CN110470947A (en) * | 2019-08-15 | 2019-11-19 | 天津大学 | A kind of ground electrode circuit fault distance-finding method suitable for MMC direct current system |
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| WO2013174726A1 (en) * | 2012-05-24 | 2013-11-28 | Alstom Technology Ltd | Method of fault clearance |
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| WO2013174726A1 (en) * | 2012-05-24 | 2013-11-28 | Alstom Technology Ltd | Method of fault clearance |
| 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 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108400575A (en) * | 2018-03-19 | 2018-08-14 | 西安交通大学 | The DC line fault guard method of characteristic signal is injected based on transverter |
| CN108551161A (en) * | 2018-03-20 | 2018-09-18 | 西安交通大学 | Utilize the transverter DC line fault guard method that actively injection and traveling wave couple |
| CN108988303A (en) * | 2018-07-19 | 2018-12-11 | 西安交通大学 | Utilize the adaptive reclosing method of MMC-HVDC DC line of breaker injected pulse signal |
| CN109462215A (en) * | 2018-10-25 | 2019-03-12 | 许继集团有限公司 | A kind of Polynuclear complex system dc line fault sweep-out method and device |
| CN109728594A (en) * | 2018-12-19 | 2019-05-07 | 华北电力大学 | A kind of DC Line Fault traversing control method of hybrid converter station |
| CN110470947A (en) * | 2019-08-15 | 2019-11-19 | 天津大学 | A kind of ground electrode circuit fault distance-finding method suitable for MMC direct current system |
| CN110470947B (en) * | 2019-08-15 | 2021-08-31 | 天津大学 | Grounding electrode line fault distance measurement method suitable for MMC direct current system |
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