CN104659749B - Over-current protection method - Google Patents
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- CN104659749B CN104659749B CN201510089088.3A CN201510089088A CN104659749B CN 104659749 B CN104659749 B CN 104659749B CN 201510089088 A CN201510089088 A CN 201510089088A CN 104659749 B CN104659749 B CN 104659749B
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Abstract
The present invention relates to flexible direct current multilevel converter bridge arm over-current protection method, valve bridge arm over current fault relaying configuration method is detected including valve base electronic device, and defencive function implementation method during valve base electronic device detection over current fault, bridge arm over-current detection is configured in upper strata Protection control system and bottom valve base electronic device simultaneously, and coordinate in sequential and definite value, by this method flexible direct current power transmission system can be realized when there is bridge arm excessively stream, reducing fault current in the case of system uninterrupted operation influences, realize bridge arm connecting line and ac bus occurs being grounded or overcurrent protection during phase-to phase fault to valve, operating process is simple and reliable, it is easily achieved.
Description
Technical field
The invention belongs to direct current transportation field, more particularly to a kind of flexible direct current multilevel converter over-current protection method,
Valve control electronic installation, control protective unit and detecting system.
Background technology
Flexible DC power transmission uses voltage source converter, can with it is separately adjustable it is active with idle transmission, improve and exchange system
The ability to transmit electricity of system, is readily configured multi-terminal direct current transmission system, electricity generation grid-connecting, isolated island urban electricity supply in regenerative resource and
The application fields such as AC system interconnection, have obvious competitiveness.
Flexible DC power transmission controls protection equipment and valve control electronic equipment, is that multilevel converter is controlled and protected
The equipment of shield, the purpose of control are to meet the service requirement of flexible direct current transmission converter station, and these requirements are included to conveying direct current
The regulation of watt level, the voltage and reactive power being connected to multilevel converter at power network are adjusted, and in station
Switch tool carry out order operation.
Flexible direct current ac bus or valve area failure, it causes failure bridge arm current and bridge arm current rate of change to compare
Greatly, bridge arm submodule unit overcurrent damage may be caused, it is necessary to valve control electronic equipment detection bridge arm current protected, passing
The measure commonly used in system HVDC protection exactly issues Permanent lockout by PC control protection and trip signal disconnects and changed
Stream device connects with AC system, reaches protection converter valve purpose.But this mode cannot distinguish between ac bus or valve area
Transient fault and permanent fault, once there is the transient fault in valve area, although protecting converter valve in this way, together
When Permanent lockout cause flexible direct current power transmission system to stop transport.The method having in addition is switched to forever by detecting the secondary excessively stream of bridge arm
Closedown mode is protected, but this mode is not avoided that bridge arm instantaneous overcurrent causes system shutdown equally, still further aspect, such as
Between each bridge arm valve control electronic equipment of fruit without communication, it is necessary to six bridge arm lockings for a period of time, this mode can not be realized.
A kind of common phenomenon is exactly that instantaneous short-circuit failure or exchange occur for bridge arm in more level flexible direct current power transmission systems
The excessively stream that transient fault causes bridge arm occurs for bus bar side, due to the uncertainty of excessively stream duration, so this instantaneous overcurrent
Flexible direct current power transmission system operation is maintained after failure can not be removed with secondary over-current detection locking or constant time lag mode.
The content of the invention
The purpose of the present invention, it is to provide a kind of over-current protection method of flexible direct current multilevel converter, valve control electronics
Device, control protective unit and detecting system.The technology protects system configuration using valve control electronic equipment and PC control
Bridge arm overcurrent protection cooperates in definite value and sequential, when ac bus or bridge arm occur for voltage-source type multilevel converter
During failure simultaneously again, there is provided protection ensures flexible direct current system continuous service target.
In order to reach above-mentioned purpose, solution of the invention is：A kind of flexible direct current multilevel converter overcurrent protection
Method, it is characterised in that per bridge arm valve control electronic equipment and PC control protection system detects bridge arm current simultaneously, and
Bridge arm overcurrent protection is all configured, both bridge arm overcurrent protections cooperate in definite value and sequential：Protected based on host computer protection
Shield, valve control electronic equipment are back-up protection, and back-up protection sets definite value higher than main protection；
Valve control electronic equipment runs in N number of cycle and all detects excessively stream with regard to temporary latch pulse, at the same on send temporary latch
Signal is to host computer；
It is as follows that host computer handles the block signal step：(a1) whether upper computer detection receives the upload of valve control electronic equipment
Temporary latch signal, confiscate just persistently hair unlocking command give valve control electronic equipment, valve control electronic equipment receives unlocking command just
Send submodule trigger pulse；As long as PC control protection system receives sent on any one valve control electronic equipment interim and closed
Lock signal, step (a2) is put into, otherwise repeat step (a1)；
(a2) after host computer delay a period of time T1, if temporary latch blackout returns to step (a1), if still
With the presence of temporary latch signal, the host computer lasting T2 times send block signal to all bridge arms, and any one valve control electronics is set
The standby block signal for receiving host computer transmission is with regard to locking pulse, into step (a3)；
(a3) host computer sends unlocking signal, returns to step (a1).
In such scheme, the N numerical value span 0~1000.
In such scheme, the back-up protection sets definite value higher than main protection, in particular to valve control electronic equipment bridge arm mistake
The rated current of stream definite value span 1.5~3.0, the rated current of host computer bridge arm excessively stream definite value span 1.0~2.0, two
Person detects the delay span 0ms-2000ms of excessively stream.
In such scheme, in the step (a2), T1 spans 0ms~100ms, T2 span 0ms~
1000ms。
In such scheme, in the step (a2), T1 delay times are host computer cycle of operation integral multiples.
In such scheme, signal is transmitted by optical-fibre channel between PC control protection system and valve control electronic equipment.
In such scheme, two-way independent detection bridge arm Over Current Protection System, i.e. redundancy are set in the valve control electronic equipment
A/B systems, wherein：The provisional blocking function of A systems and B system is run simultaneously, phase between provisional blocking order A/B systems
Mutually verification；Any system blocking order is effectively locking, while sets two-way to detect bridge arm current path in every set system,
Detect the bridge arm current numerical value that bridge arm current measurement apparatus is sent in valve control electronic equipment simultaneously by two paths, and mutually
Detection excessively stream result is exchanged, the locking if detection excessively stream result is consistent, inconsistent then not locking.
It is individual in the redundancy A/B systems to have independent detection bridge arm overcurrent protection logic all the way in such scheme, respectively two
Cover and performed in independent high speed processor, performing step is：
(b1) two-way high speed processor samples bridge arm current according to the respective cycle of operation in valve control electronic equipment, if appointing
What detects bridge arm excessively stream all the way, into step (b2), otherwise repeat step (b1)；
(b2) testing result is sent to an other path processor, each path processor compares testing result and received in addition
The bridge arm over-current detection result that one path processor is sent, if testing result is inconsistent, the inconsistent alarm signal of detection is sent, should
Host computer is sent in alarm signal, returns to step (b1), if testing result is consistent, into step (b3)；
(b3) retriggered pulse after the valve control electronic equipment temporary latch pulse for a period of time, locking pulse moment will face
When block signal on send host computer Control protection system, return to step (b1).
In above step, any moment receives the block signal of host computer transmission, valve control electronic equipment closed venation immediately
Punching, stop over-current detection, after host computer sends unlocking signal, return step (b1).
In such scheme, valve control electronic equipment temporary latch burst length described in step (b3) is 0~20 valve control electricity
The sub- equipment cycle of operation.
The present invention also provides a kind of valve control electronic installation for detecting flexible direct current converter bridge arm excessively stream, it is characterised in that：
Detection bridge arm overcurrent protection logic is set in a device, performed respectively in two independent high speed processors of device, is performed
Step is：
(b1) two-way high speed processor samples bridge arm current according to the respective cycle of operation in valve control electronic equipment, if appointing
What detects bridge arm excessively stream all the way, into step (b2), otherwise repeat step (b1)；
(b2) testing result is sent to an other path processor, each path processor compares testing result and received in addition
The bridge arm over-current detection result that one path processor is sent, if testing result is inconsistent, the inconsistent alarm signal of detection is sent, should
Host computer is sent in alarm signal, returns to step (b1), if testing result is consistent, into step (b3)；
(b3) retriggered pulse after the valve control electronic installation temporary latch pulse for a period of time, locking pulse moment will face
When block signal on send host computer Control protection system, return to step (b1).
In such scheme, valve control electronic equipment temporary latch burst length described in step (b3) is 0~20 valve control electricity
The sub- equipment cycle of operation.
The present invention also provides a kind of PC control protection device for detecting flexible direct current converter bridge arm excessively stream, its feature
It is：Set in a device and detect bridge arm overcurrent protection logic, the logic is as follows：
(a1) whether upper computer detection receives the temporary latch signal of valve control electronic equipment upload, confiscates just lasting hair and solves
Valve control electronic equipment is given in lock order, and valve control electronic equipment receives unlocking command and is issued by submodule trigger pulse；PC control
As long as protection system receives the temporary latch signal sent on any one valve control electronic equipment, step (a2) is put into, is otherwise weighed
Multiple step (a1)；
(a2) after host computer delay a period of time T1, if temporary latch blackout returns to step (a1), if still
With the presence of temporary latch signal, the host computer lasting T2 times send block signal to all bridge arms, and any one valve control electronics is set
The standby block signal for receiving host computer transmission is with regard to locking pulse, into step (a3)；
(a3) host computer sends unlocking signal, returns to step (a1).
T1 span 0ms~100ms, it is host computer cycle of operation integer in the step (a2) in such scheme
Times, T2 spans 0ms~1000ms.
The present invention also provides a kind of bridge arm over-current detection system being made up of PC control protection with valve control electronics, and it is special
Sign is, all configures bridge arm overcurrent protection logic, and both bridge arm overcurrent protections cooperate in definite value and sequential：Host computer
It is back-up protection to protect as main protection, valve control electronic equipment, and back-up protection sets definite value higher than main protection；
Such scheme, the back-up protection sets definite value higher than main protection, in particular to valve control electronic equipment bridge arm excessively stream
The rated current of definite value span 1.5~3.0, the rated current of host computer bridge arm excessively stream definite value span 1.0~2.0, both
Detect the delay span 0ms-2000ms of excessively stream.
After such scheme, beneficial effects of the present invention are：
(1) the more level converter valve bridge arm overcurrent protection processing methods of flexible direct current power transmission system provided by the invention, utilize
Bridge arm current spike when the protection of valve control electronic equipment temporary latch eliminates failure, is protected using valve control electronic equipment and PC control
Different bridge arm overcurrent protection definite values and delay are set in shield, are reached protection converter valve while are maintained straight-flow system to run purpose；
(2) by sending temporary latch signal on upper computer detection valve control electronic equipment, the locking simultaneously of all bridge arms is realized, no
Need mutually to communicate between multiple valve control electronic equipments.
Brief description of the drawings
Fig. 1 is upper computer control system in the present invention, valve control electronic equipment, measuring system and multilevel converter bridge arm light
Fine attachment structure schematic diagram；
Fig. 2 is that measuring system is connected embodiment schematic diagram with valve control electronic equipment in the present invention；
Fig. 3 is that the connection embodiment of valve control electronic equipment and more level flexible direct current bridge arm comprising modules in the present invention is illustrated
Figure；
Fig. 4 is more level flexible direct current bridge arm single module schematic diagrames in the present invention；
Fig. 5 is host computer operational flow diagram in a kind of flexible direct current multilevel converter over-current protection method of the present invention；
Fig. 6 is valve control electronic equipment operational process in a kind of flexible direct current multilevel converter over-current protection method of the present invention
Figure.
Embodiment
A kind of flexible direct current multilevel converter over-current protection method, this method are applied in the PC control shown in Fig. 1
In protection system 100 and valve control electronic equipment 201-206, wherein shown in Fig. 1 AC system 800 by transformer 700 and
Service entrance switch 600 is connected to the bridge of converter valve 300, valve control electronic equipment 201-206 and the configuration of the Control protection system of host computer 100
Arm overcurrent protection fitting method in definite value and sequential is as follows：
The protection of host computer 100 is main protection, and valve control electronic equipment 201-206 is back-up protection, and back-up protection sets definite value
It is higher than main protection, but action delay is relatively short, and valve control electronic equipment detection bridge arm 301-306 excessively stream action consequences are to close temporarily
Unlocked again after lock pulse, host computer bridge arm overcurrent protection the result of the action is locking converter valve 300 and tripping connection exchange immediately
Service entrance switch 600.
It should be noted that temporary latch pulse refers to locking pulse in short-term, only performed in valve control electronic equipment, it is short
When locking pulse time range be 0~10s.
The rated current of valve control electronic equipment 201-206 detection bridge arm 301-306 excessively stream definite values span 1.5~3.0, on
The rated current of position machine bridge arm excessively stream definite value span 1.0~2.0, both detect overcurrent delay span 0ms-2000ms.
All detect excessively stream with regard to temporary latch pulse in valve control electronic equipment 201-206 runs N number of cycle, at the same on give
For temporary latch signal to host computer, it is as follows that host computer 100 handles the block signal step：
(a1) host computer 100 detects whether to receive the temporary latch signal of valve control electronic equipment 201-206 uploads, confiscates
Just persistently hair unlocking command gives valve control electronic equipment 201-206, bridge arm valve control electronic equipment 201-206 to receive unlocking command just
Send the trigger pulse of submodule 3011.As long as host computer 100 receives the temporary latch letter sent on any one valve control electronic equipment
Number, step (a2) is put into, otherwise repeat step (a1)；
(a2) host computer 100 was delayed after a period of time, and be delayed span 0ms~100ms, if temporary latch signal disappears
Mistake returns to step (a1), if still sending six bridge arm 301-306 block signal with the presence of temporary latch signal, host computer
For a period of time, value this period 0ms~1000ms, any one valve control electronic equipment receive the block signal of host computer transmission
With regard to locking pulse, into step (a3)；
(a3) host computer 100 sends unlocking signal, returns to step (a1).
PC control protection system 100 receives any one valve control electronic equipment 201- in step (a2) described above
After the temporary latch signal sent on 206, delay a period of time, whether detection signal was also present again, and the delay time is host computer
Cycle of operation integral multiple, the time that excessively stream multiple is born according to bridge arm 301-306 are configured.Above processing step flow chart is shown in
Shown in Fig. 5.
Above-described a kind of flexible direct current multilevel converter over-current protection method, in valve control electronic equipment 201-206
Middle setting two-way independent detection bridge arm overcurrent protection logic, the logic performs in two sets of independent high speed processors respectively, high
Fast processor samples bridge arm current according to the respective cycle of operation, compares the instantaneous numerical value of the sampling and setting excessively stream definite value, if through
Cross certain time-delay and still detect that the instantaneous numerical value of sampling is more than setting excessively stream definite value, processor judges this road and bridge arm excessively stream, should
Method comprises the following steps：
(b1) two-way high speed processor samples bridge arm 301- according to the respective cycle of operation in valve control electronic equipment 201-206
306 electric currents, bridge arm excessively stream is detected all the way if any, into step (b2), otherwise repeat step (b1)；
(b2) testing result is sent to an other path processor, each path processor compares testing result and received in addition
The bridge arm over-current detection result that one path processor is sent, if testing result is inconsistent, the inconsistent alarm signal of detection is sent, should
Host computer 100 is sent in alarm signal, returns to step (b1), if testing result is consistent, into step (b3)；
(b3) retriggered pulse after the valve control electronic equipment 201-206 temporary latches pulse for a period of time, locking pulse
Moment will send host computer 100 on temporary latch signal, return to step (b1).
In above step, any moment receives the block signal of host computer transmission, valve control electronic equipment closed venation immediately
Punching, stop over-current detection, after host computer sends unlocking signal, return step b1.
The 201-206 temporary latch burst lengths of valve control electronic equipment described in above step (b3) are 0~20 operation week
Phase.Above processing step flow chart is as shown in Figure 6.
This method is set in flexible direct current power transmission system converter valve control electronic equipment 201-206 and PC control protection
Implement simultaneously in standby 100, the valve control electronic equipment 201-206 and six bridge arm 301-306 control unit of submodule 3011 passes through
Optical fiber 311-316 connections (Fig. 3), each bridge arm 301-306 are connected by multiple submodule 3011, and each submodule 3011 has
Corresponding submodule block control unit (Fig. 4).
Bridge arm overcurrent protection strategy configuration mode in valve control electronic equipment 201-206 redundancy A/B systems is：A systems and
The provisional blocking function of B system is run simultaneously, is mutually verified between provisional blocking order A/B systems；Any system locking
Instruction effectively i.e. locking, while set two-way to detect bridge arm current path in every set system, in valve control electronic equipment 201-206
In by two paths detect the bridge arm current numerical value that bridge arm current measurement apparatus 400,401 sends simultaneously, and be exchanged with each other
Excessively stream result is detected, the locking if detection excessively stream result is consistent, inconsistent then not locking.
In flexible direct current power transmission system converter valve overcurrent protection collocation method, valve control electronic equipment 201-206 two-way inspection
It is to receive two sets of measuring systems 400,401 respectively by single optical-fibre channel 110,111 to transmit bridge arm to survey bridge arm current path
Current sampling signal, (Fig. 2), this two sets of measuring systems are completely independent from measurement links to sampling processing link.
In flexible direct current power transmission system converter valve overcurrent protection collocation method, PC control protection system 100 passes through light
Fine passage 311 receives every deck valve control electronic equipment 201-206 overcurrent protection temporary latch signal, has been handled by relay protective scheme
The synchronous locking or open-minded of paired all bridge arm valve control electronic equipment 201-206 pulses, avoids asynchronous locking, avoids difference
Block signal is exchanged each other between valve control electronic equipment 201-206.
A kind of flexible direct current multilevel converter over-current protection method provided by the present invention, is faced using valve control electronic equipment
When latch-up protection eliminate failure when bridge arm current spike, utilize valve control electronic equipment and PC control protection in different bridge arm mistakes
Stream protection definite value and delay are set, and are reached protection converter valve while are maintained straight-flow system to run purpose.
Present invention additionally comprises a kind of valve control electronic installation for detecting flexible direct current converter bridge arm excessively stream, it is characterised in that：
Detection bridge arm overcurrent protection logic is set in a device, performed respectively in two independent high speed processors of device, is performed
Step is：
(b1) two-way high speed processor samples bridge arm current according to the respective cycle of operation in valve control electronic equipment, if appointing
What detects bridge arm excessively stream all the way, into step (b2), otherwise repeat step (b1)；
(b2) testing result is sent to an other path processor, each path processor compares testing result and received in addition
The bridge arm over-current detection result that one path processor is sent, if testing result is inconsistent, the inconsistent alarm signal of detection is sent, should
Host computer is sent in alarm signal, returns to step (b1), if testing result is consistent, into step (b3)；
(b3) retriggered pulse after the valve control electronic installation temporary latch pulse for a period of time, locking pulse moment will face
When block signal on send host computer Control protection system, return to step (b1).
A kind of valve control electronic installation for detecting flexible direct current converter bridge arm excessively stream as described above, it is characterised in that step
Suddenly the temporary latch burst length of valve control electronic equipment described in (b3) is 0~20 valve control electronic equipment cycle of operation.
Present invention additionally comprises a kind of PC control protection device for detecting flexible direct current converter bridge arm excessively stream, its feature
It is：Set in a device and detect bridge arm overcurrent protection logic, the logic is as follows：
(a1) whether upper computer detection receives the temporary latch signal of valve control electronic equipment upload, confiscates just lasting hair and solves
Valve control electronic equipment is given in lock order, and valve control electronic equipment receives unlocking command and is issued by submodule trigger pulse；PC control
As long as protection system receives the temporary latch signal sent on any one valve control electronic equipment, step (a2) is put into, is otherwise weighed
Multiple step (a1)；
(a2) after host computer delay a period of time T1, if temporary latch blackout returns to step (a1), if still
With the presence of temporary latch signal, the host computer lasting T2 times send block signal to all bridge arms, and any one valve control electronics is set
The standby block signal for receiving host computer transmission is with regard to locking pulse, into step (a3)；
(a3) host computer sends unlocking signal, returns to step (a1).
A kind of PC control protection device for detecting flexible direct current converter bridge arm excessively stream as described above, its feature exist
In in the step (a2), T1 span 0ms~100ms are host computer cycle of operation integral multiples, T2 spans 0ms
~1000ms.
Present invention additionally comprises a kind of bridge arm over-current detection system being made up of PC control protection with valve control electronics, it is special
Sign is, all configures bridge arm overcurrent protection logic, and both bridge arm overcurrent protections cooperate in definite value and sequential：Host computer
It is back-up protection to protect as main protection, valve control electronic equipment, and back-up protection sets definite value higher than main protection；
The bridge arm over-current detection system that above-described PC control protection is formed with valve control electronics, it is characterised in that
The back-up protection sets definite value higher than main protection, in particular to valve control electronic equipment bridge arm excessively stream definite value span 1.5~
3.0 rated current, the rated current of host computer bridge arm excessively stream definite value span 1.0~2.0, both detect the delay value of excessively stream
Scope 0ms-2000ms.
The technological thought of above example only to illustrate the invention, it is impossible to protection scope of the present invention is limited with this, it is every
According to technological thought proposed by the present invention, any change done on the basis of technical scheme, the scope of the present invention is each fallen within
Within.
Claims (9)
- A kind of 1. flexible direct current multilevel converter over-current protection method, it is characterised in that per bridge arm valve control electronic equipment and on Position machine Control protection system detects bridge arm current simultaneously, and all configures bridge arm overcurrent protection, and both bridge arm overcurrent protections exist Cooperated in definite value and sequential：Host computer protection is main protection, and valve control electronic equipment is back-up protection, and back-up protection sets fixed Value is higher than main protection；Valve control electronic equipment runs in N number of cycle and all detects excessively stream with regard to temporary latch pulse, at the same on send temporary latch signal To host computer；It is as follows that host computer handles the block signal step：(a1) whether upper computer detection receives the interim of valve control electronic equipment upload Block signal, confiscate just persistently hair unlocking command give valve control electronic equipment, valve control electronic equipment receives unlocking command and is issued by Submodule trigger pulse；As long as PC control protection system receives the temporary latch letter sent on any one valve control electronic equipment Number, step (a2) is put into, otherwise repeat step (a1)；(a2) after host computer delay a period of time T1, if temporary latch blackout returns to step (a1), face if still had When block signal exist, host computer continue the T2 times to all bridge arms send block signal, any one valve control electronic equipment receive The block signal sent to host computer is with regard to locking pulse, into step (a3)；(a3) host computer sends unlocking signal, returns to step (a1).
- A kind of 2. flexible direct current multilevel converter over-current protection method as claimed in claim 1, it is characterised in that the N Numerical value span 0~1000.
- 3. a kind of flexible direct current multilevel converter over-current protection method as claimed in claim 1, it is characterised in that after described Standby protection setting definite value is higher than main protection, in particular to valve control electronic equipment bridge arm excessively stream definite value span 1.5~3.0 is specified Electric current, the rated current of host computer bridge arm excessively stream definite value span 1.0~2.0, both detect the delay span of excessively stream 0ms-2000ms。
- A kind of 4. flexible direct current multilevel converter over-current protection method as claimed in claim 1, it is characterised in that the step Suddenly in (a2), T1 spans 0ms~100ms, T2 span 0ms~1000ms.
- A kind of 5. flexible direct current multilevel converter over-current protection method as claimed in claim 1, it is characterised in that the step Suddenly in (a2), T1 delay times are host computer cycle of operation integral multiples.
- A kind of 6. flexible direct current multilevel converter over-current protection method as claimed in claim 1, it is characterised in that host computer Signal is transmitted by optical-fibre channel between Control protection system and valve control electronic equipment.
- A kind of 7. flexible direct current multilevel converter over-current protection method as claimed in claim 1, it is characterised in that the valve Control and two-way independent detection bridge arm Over Current Protection System, i.e. redundancy A/B systems are set in electronic equipment, wherein：A systems and B system Provisional blocking function run simultaneously, mutually verified between provisional blocking order A/B systems；Any system blocking order has Effect is locking, while sets two-way to detect bridge arm current path in every set system, is led in valve control electronic equipment by two-way Road detects the bridge arm current numerical value that bridge arm current measurement apparatus is sent simultaneously, and is exchanged with each other detection excessively stream result, if inspection Survey the consistent then locking of excessively stream result, inconsistent then not locking.
- 8. a kind of flexible direct current multilevel converter over-current protection method as claimed in claim 7, it is characterised in that described superfluous Respectively there is independent detection bridge arm overcurrent protection logic all the way in remaining A/B systems, performed respectively in two sets of independent high speed processors, Performing step is：(b1) two-way high speed processor samples bridge arm current according to the respective cycle of operation in valve control electronic equipment, if any one Road detects bridge arm excessively stream, into step (b2), otherwise repeat step (b1)；(b2) testing result is sent to an other path processor, each path processor compare testing result and receive in addition all the way The bridge arm over-current detection result that processor is sent, if testing result is inconsistent, send the inconsistent alarm signal of detection, the alarm Host computer is sent on signal, returns to step (b1), if testing result is consistent, into step (b3)；(b3) retriggered pulse after the valve control electronic equipment temporary latch pulse for a period of time, locking pulse moment will close temporarily Host computer Control protection system is sent on lock signal, returns to step (b1).In above step, any moment receives the block signal of host computer transmission, the locking pulse immediately of valve control electronic equipment, stops Only over-current detection, after host computer sends unlocking signal, return step (b1).
- A kind of 9. flexible direct current multilevel converter over-current protection method as claimed in claim 8, it is characterised in that step (b3) the electronic equipment temporary latch burst length of valve control described in is 0~20 valve control electronic equipment cycle of operation.
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| US20220352810A1 (en) * | 2020-03-26 | 2022-11-03 | Hyosung Heavy Industries Corporation | Control device and control method for modular multilevel converter |
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| CN105186460B (en) * | 2015-10-08 | 2017-10-13 | 南京南瑞继保电气有限公司 | Suitable for the excessively stream quick lock guard method of modular multilevel converter valve |
| CN106505512B (en) * | 2016-12-07 | 2019-01-08 | 北京四方继保自动化股份有限公司 | Number is unlocked after soft straight control system temporary blocking again to overflow trip method |
| CN109560532A (en) * | 2017-09-27 | 2019-04-02 | 南京南瑞继保电气有限公司 | A kind of flexible direct current multilevel converter bridge arm over-current protection method |
| CN111276942B (en) * | 2020-03-26 | 2022-05-10 | 特变电工西安柔性输配电有限公司 | Bridge arm current stress reduction method for offshore wind power flexible direct-transmission system |
| CN111697542B (en) * | 2020-05-14 | 2022-09-16 | 南方电网科学研究院有限责任公司 | Control system and method for synchronous temporary locking of flexible direct-current valve group |
| CN112165242B (en) * | 2020-09-24 | 2021-07-23 | 国网冀北电力有限公司检修分公司 | Control protection system of high-voltage flexible converter valve and protection method and device thereof |
| WO2024087165A1 (en) * | 2022-10-28 | 2024-05-02 | 宁德时代未来能源(上海)研究院有限公司 | Overcurrent detection apparatus, protection apparatus, and anomaly early warning method |
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| 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 |
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| CN105680421A (en) * | 2014-11-17 | 2016-06-15 | 南京南瑞继保电气有限公司 | Protection method for modular multilevel converter |
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| US7321500B2 (en) * | 2005-04-29 | 2008-01-22 | Abb Technology Ltd. | Electric power converter |
| WO2014111595A1 (en) * | 2013-01-21 | 2014-07-24 | Abb Technology Ltd | A multilevel converter with hybrid full-bridge cells |
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| 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 |
| CN103997024A (en) * | 2014-06-06 | 2014-08-20 | 西安石油大学 | Face protection method and system through higher-lower stage blocking |
| CN105680421A (en) * | 2014-11-17 | 2016-06-15 | 南京南瑞继保电气有限公司 | Protection method for modular multilevel converter |
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| US20220352810A1 (en) * | 2020-03-26 | 2022-11-03 | Hyosung Heavy Industries Corporation | Control device and control method for modular multilevel converter |
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