CN108258657A - A kind of voltage source converter protection circuit and guard method and device - Google Patents
A kind of voltage source converter protection circuit and guard method and device Download PDFInfo
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- CN108258657A CN108258657A CN201810178402.9A CN201810178402A CN108258657A CN 108258657 A CN108258657 A CN 108258657A CN 201810178402 A CN201810178402 A CN 201810178402A CN 108258657 A CN108258657 A CN 108258657A
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- voltage
- valve group
- type valve
- source type
- series compensation
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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
- H02H7/1203—Circuits independent of the type of conversion
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- Protection Of Static Devices (AREA)
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Abstract
The present invention discloses a kind of voltage source converter protection circuit; at voltage-source type valve group both ends, parallel connection bypasses thyristor controlled series compensation; it is connected between the bypass anode of thyristor controlled series compensation and the anode of voltage-source type valve group or between the bypass cathode of thyristor controlled series compensation and the cathode of voltage-source type valve group at least through a connecting valve; voltage source converter can be protected; it prevents it from overvoltage, overcurrent occurs, and straight-flow system can be restarted after failure vanishes.Invention additionally discloses a kind of voltage source converter guard method and devices; when system jam leads to voltage-source type valve group voltage or controller; input bypass thyristor controlled series compensation; disconnect the connecting valve between bypass thyristor controlled series compensation and voltage-source type valve group; and fault message is transmitted to converting plant; converting plant reduces DC voltage; DC current is reduced to zero; bypass the shutdown of thyristor controlled series compensation current over-zero; close the connecting valve between bypass thyristor controlled series compensation and voltage-source type valve group, the access of voltage-source type valve group.
Description
Technical field
The invention belongs to flexible DC power transmission, high-voltage dc transmission electrical domains, and in particular to a kind of voltage source converter protection
Circuit and guard method and device.
Background technology
Direct current transportation advantage based on voltage source converter is high for controllability, can access passive system, does not need to idle benefit
Repay device；Shortcoming is big for transverter switching loss, and when inverter side AC system or transverter break down, transverter can be produced
Raw larger voltage and current impact, even damages transverter when serious.
When inverter side uses the modularization multi-level converter of half-bridge structure, when inverter side AC system breaks down,
Inverter side and rectification side DC voltage can be all lifted, and rectification side prevents inverter side transverter over-pressed by being latched transverter rapidly
And overcurrent.It is inverse when inverter side AC system breaks down when inverter side uses the modularization multi-level converter of full bridge structure
Becoming side and rectification side DC voltage can all be lifted, and rectification side prevents the overvoltage of inverter side transverter and overcurrent by reducing voltage.
Although under certain fault conditions, rectification side can be inhibited by perceiving DC voltage raising suddenly or DC current increase suddenly
False voltage or electric current, but cannot acquisition submodule in real time voltage and current information, this is because rectification side obtains inversion
Side fault message communicates delay, and inverter side bridge arm current is not equal to DC current between there is station.Therefore, rapid tune is only relied on
It is difficult to meet all fault conditions to transverter voltage or current requirements to save rectification side.
When inverter side is using the transverter based on line commutation and the mixing transverter based on voltage source converter series connection,
When inverter side AC system breaks down, commutation failure can occur for the transverter based on line commutation, and both end voltage is fallen to
Zero, compared to above-mentioned inverter side only with voltage source converter, rectification side cannot even be judged inverse by detecting DC voltage
Become side voltage source converter and over-voltage fault occurs, can only rely on and communicate to obtain Inverter Station fault message between standing, due to leading between station
There is delay in news, it is easy to lead to voltage source converter overvoltage and overcurrent.
Invention content
The purpose of the present invention is to provide a kind of voltage source converter protection circuit, prevents voltage source converter from occurring tight
Weight overvoltage or overcurrent, protect voltage-source type valve group reliability service；A kind of voltage source converter guard method and device are provided simultaneously,
For this voltage source converter to be controlled to protect circuit.
In order to achieve the above objectives, the technical solution adopted by the present invention is：A kind of voltage source converter protects circuit, is used for
Voltage-source type valve group is protected, including at least bypass two elements of thyristor controlled series compensation and a connecting valve, connection mode is in electricity
Potential source type valve group both ends parallel connection bypass thyristor controlled series compensation, bypasses between the anode of thyristor controlled series compensation and the anode of voltage-source type valve group
Or it is connected between the bypass cathode of thyristor controlled series compensation and the cathode of voltage-source type valve group at least through a connecting valve.
In said program：Voltage-source type valve group includes at least a voltage source converter or public by anode and cathode
End is connected to the voltage source converter in a distant place by DC line altogether.
It is connected between the voltage source converter in an above-mentioned distant place and DC line at least through a connecting valve.
Bypass thyristor controlled series compensation anode and voltage-source type valve group anode between or bypass thyristor controlled series compensation cathode with
Increase current-limiting reactor between the cathode of voltage-source type valve group.
Above-mentioned voltage-source type valve group is following any one or more：The more level of two level converters, diode-clamped change
Flow device, modularization multi-level converter MMC, mixed multi-level transverter HMC, two level cascade current converter CSL or stack
Two level converter CTL are made of the full-control type power semiconductor that can be turned off.
The above-mentioned full-control type power semiconductor turned off is following any one or more：Insulated gate bipolar transistor
IGBT, integrated gate commutated thyristor IGCT, turn-off thyristor GTO, Power MOSFET Power MOSFET, electron injection
Enhance gate transistor IEGT, door pole stream-exchanging thyristor GCT or SiC reinforcement type junction field effect transistor SiC-JFET.
In said program：Thyristor controlled series compensation is bypassed only comprising a bridge arm, is made of multiple Thyristors in series, and include phase
The Drive Protecting Circuit answered；Or the bypass thyristor controlled series compensation is the bypass pair of line commutation transverter in parallel or passes through institute
The quick phase shift of line commutation transverter in parallel is stated to realize；Optionally, the beginning or end series connection after multiple Thyristors in series
Direct current change-over switch or isolation switch；Optionally, bypass thyristor controlled series compensation both ends parallel connection bypass cock, bypass cock be with
Under it is any：Direct current change-over switch, isolation switch or direct current change-over switch and isolation switch.Above-mentioned line commutation transverter is six
Pulsation bridge circuit or 12 pulsation bridge circuits, are made of the half control type power semiconductor that can not be turned off, general using not
The thyristor that can be turned off.The above-mentioned quick phase shift of line commutation transverter is the triggering by quickly adjusting line commutation transverter
Angle reduces the voltage of line commutation transverter or increases the electric current of line commutation transverter.
In said program：Connecting valve be power electronic devices form dc circuit breaker or be direct current change-over switch,
Either isolation switch or be the only diode of one-way conduction ability or thyristor or be above-mentioned arbitrary combination.
Above-mentioned voltage-source type valve group is individually composed a direct current pole or is composed in series one with other voltage-source type valve groups
Direct current pole is composed in series a direct current pole with current source type valve group.
The present invention also provides a kind of voltage source converter guard method, for controlling above-mentioned voltage source converter protection electricity
Road, it is characterised in that：When voltage-source type valve group detects that failure needs to exit, it is brilliant to disconnect bypass for input bypass thyristor controlled series compensation
Connecting valve between brake tube valve group and voltage-source type valve group only has the voltage-source type valve group to run this pole, Huo Zhesuo
State voltage-source type valve group also with this extremely his valve group series operation when occur instantaneously can self-healing failure, control bypass thyristor
Valve group electric current is turned off to zero, after failure vanishes, closes the connecting valve between bypass thyristor controlled series compensation and voltage-source type valve group, voltage
Source type valve group access, coordinates control by rectification side and inverter side, restarts DC transmission system；For the voltage-source type valve group
Also with this extremely his valve terminal series operation when occur instantaneously cannot self-healing failure, by bypassing thyristor controlled series compensation or side
The bypass cock of logical thyristor controlled series compensation both ends parallel connection provides current path, is latched the voltage-source type valve group or DC power transmission system
System.
In said program：Voltage-source type valve group detects that failure includes control system failure, valve area failure, main transformer area
Failure and fault in ac transmission system, the needs exit DC voltage, DC current, the bridge arm electricity by detecting voltage-source type valve group
Stream is more than threshold value；Or pass through detection sub-module voltage or controller；Or by detecting alternating voltage, alternating current
Indirect predictions or auxiliary judgment；Or occur by the appearance of voltage-source type valve group stoppage in transit signal, protection signal, block signal
Occur, run signal disappears to judge；Or occur judging by main transformer protection action signal.
Above-mentioned control bypasses thyristor controlled series compensation electric current to zero shutdown, is to bypass thyristor controlled series compensation electric current by this stand control to arrive
Zero or by fault message be transmitted to station, to station owner lead control bypass thyristor controlled series compensation electric current to zero or two stations coordinate control
System bypasses thyristor controlled series compensation electric current to zero；The control bypass thyristor controlled series compensation electric current to zero method is in bypass thyristor valve
Group applies zero-pressure or back-pressure or disconnects the direct current change-over switch in DC transmission system current loop to realize.
The above-mentioned instantaneous self-healing failure of energy refers to what is voluntarily removed or removed by Control protection system in a short time
Failure, after fault clearance, DC transmission system can be continued to run with according to the former method of operation；It is above-mentioned instantaneously cannot it is self-healing therefore
Barrier refers to need the long period that could voluntarily remove or remove by Control protection system or needs stop transport and overhaul and could remove
Failure, in a short time DC transmission system need to change the former method of operation and can just continue to run with.
The present invention also provides a kind of voltage source converter protective device, for controlling above-mentioned voltage source converter protection electricity
Road, which is characterized in that described device includes detection unit, protection location and control unit, wherein：
Detection unit detects the DC voltage, DC current, bridge arm current of voltage-source type valve group, voltage, the electricity of submodule
Stream, alternating voltage, the alternating current of incoming transport system, voltage-source type valve group stoppage in transit signal, protection signal, locking letter
Number, run signal, main transformer protection action signal；The appearance of voltage-source type valve group failure is judged whether there is, there is then trigger protection
Unit；
Protection location judges that voltage-source type valve group failure occurs, and input bypass thyristor controlled series compensation disconnects bypass thyristor valve
Connecting valve between group and voltage-source type valve group, and trigger control unit；
Control unit, for only have the voltage-source type valve group to run or the voltage-source type valve group also with other valves
Generation instantaneous energy self-healing failure during group series operation, control bypass thyristor controlled series compensation electric current is turned off to zero, after failure vanishes,
The connecting valve between bypass thyristor controlled series compensation and voltage-source type valve group is closed, DC power transmission system is restarted in the access of voltage-source type valve group
System；For the voltage-source type valve group also with occur during other valve terminal series operations instantaneously cannot self-healing failure, it is other
Logical thyristor controlled series compensation or the bypass cock offer current path for bypassing thyristor controlled series compensation both ends parallel connection, ensure that other valve groups are normally transported
Row.
In said program：The voltage source converter protects circuit, for protecting voltage-source type valve group, including at least bypass
Two elements of thyristor controlled series compensation and a connecting valve, connection mode are to bypass thyristor valve in the parallel connection of voltage-source type valve group both ends
Group bypasses between the anode of thyristor controlled series compensation and the anode of voltage-source type valve group or bypasses the cathode and voltage source of thyristor controlled series compensation
It is connected between the cathode of type valve group at least through a connecting valve.
In said program：Protection location control bypass thyristor controlled series compensation electric current is to dominate control by our station to zero shutdown
Bypass thyristor controlled series compensation electric current is transmitted to zero or by fault message to station, and control bypass thyristor controlled series compensation electricity is led to station owner
Flow to zero；The control bypass thyristor controlled series compensation electric current to zero method is to apply zero-pressure or back-pressure in bypass thyristor controlled series compensation,
Or the direct current change-over switch in DC transmission system current loop is disconnected to realize.
In said program：It is to be started against on the circuit structure before failure directly that control unit, which restarts DC transmission system,
Flow power.
In said program：Voltage-source type valve group is individually composed a direct current pole or connects with other voltage-source type valve groups
One direct current pole of composition is composed in series a pole with current source type valve group.Voltage-source type valve group and current source type valve group string
One pole of connection composition, there are two types of be connected in series with topological structure：(1) cathode of current source type valve group and the anode of voltage-source type valve group
It is connected；Or the anode of (2) current source type valve group is connected with the cathode of voltage-source type valve group.Current source type valve group includes at least one
A line commutation transverter, the line commutation transverter is six pulsation bridge circuits or 12 pulsation bridge circuits, by not
The thyristor groups that can be turned off into.
The beneficial effects of the invention are as follows：It proposes a kind of voltage source converter protection circuit and guard method and device, passes through
Input bypass thyristor release DC energy, and current path is provided for other operation valve groups, prevent voltage source converter from occurring
Overvoltage or overcurrent, and straight-flow system can be restarted after failure vanishes.
Description of the drawings
Fig. 1 is a kind of voltage source converter protection circuit structure of the present invention；
Fig. 2 is a kind of voltage source converter guard method of the present invention；
Fig. 3 is a kind of voltage source converter protective device of the present invention；
Fig. 4 is the flexible DC power transmission circuit structure that both ends are all based on voltage source converter；
Fig. 5 be sending end be based on line commutation transverter, receiving end be based on voltage source converter Hybrid HVDC electricity
Line structure；
Fig. 6 be sending end be based on the series connection of line commutation transverter, receiving end changed based on line commutation transverter and voltage source
Flow the Hybrid HVDC circuit structure of device series connection.
Specific embodiment
The embodiment of the present invention is described by the following drawings, wherein, identical component uses identical attached drawing mark
Note.Fig. 1 protects circuit for a kind of voltage source converter proposed by the present invention, and protection voltage-source type valve group 1 is brilliant including at least bypass
3 two elements of brake tube valve group 2 and a connecting valve, connection mode are to bypass thyristor in the 1 both ends parallel connection of voltage-source type valve group
Valve group 2 bypasses between the anode X1 of thyristor controlled series compensation and the anode X3 of voltage-source type valve group or bypasses the cathode of thyristor controlled series compensation
It is connected between X2 and the cathode X4 of voltage-source type valve group at least through a connecting valve 3.
Voltage-source type valve group 1 includes at least a voltage source converter or is passed through by anode and cathode common end straight
Flow Line is connected to the voltage source converter in a distant place；Optionally, the anode X1 of bypass thyristor controlled series compensation 2 and voltage-source type valve group
Increase current-limiting reactor 4 between anode X3 or between the cathode X2 of bypass thyristor controlled series compensation and the cathode X4 of voltage-source type valve group；It can
Selection of land, in bypass 2 both ends parallel connection direct change-over switch 5 of thyristor controlled series compensation.
Fig. 2 is a kind of voltage source converter guard method proposed by the present invention, and the voltage source converter protection of control figure 1 is electric
Road when voltage-source type valve group 1 detects that failure needs the valve group to exit, sends out input bypass thyristor controlled series compensation 2, disconnects the brilliant lock of bypass
Connecting valve 3 between pipe valve group 2 and voltage-source type valve group 1, for only having the voltage-source type valve group 1 to run or described
Voltage-source type valve group 1 is also with occurring the instantaneously self-healing failure of energy, control bypass thyristor controlled series compensation 2 during other valve group series operations
Electric current is turned off to zero, after failure vanishes, closes the connecting valve 3 between bypass thyristor controlled series compensation 2 and voltage-source type valve group 1, voltage
Source type valve group 1 accesses；For the voltage-source type valve group 1 also with occur during other valve terminal series operations instantaneously cannot be from extensive
Multiple failure provides current path by bypassing thyristor controlled series compensation 2 or bypassing the bypass cock 5 of thyristor controlled series compensation 2 both ends parallel connection.
Fig. 3 is a kind of voltage source converter protective device proposed by the present invention, and the voltage source converter protection of control figure 1 is electric
Road, including：
Detection unit 31, the DC voltage of detection voltage-source type valve group 1, DC current, bridge arm current, the electricity of submodule
Pressure, electric current, alternating voltage, the alternating current of incoming transport system, voltage-source type valve group stoppage in transit signal, close at protection signal
Lock signal, run signal, main transformer protection action signal；The appearance of 1 failure of voltage-source type valve group is judged whether there is, has, triggers
Protection location 32；
Protection location 32 judges that 1 failure of voltage-source type valve group occurs, and input bypass thyristor controlled series compensation 2 disconnects the brilliant lock of bypass
Connecting valve 3 between pipe valve group 2 and voltage-source type valve group 1, and trigger control unit 33；
Control unit 33, for only have voltage-source type valve group 1 to run or voltage-source type valve group 1 also with other valve group strings
Instantaneously the self-healing failure of energy, control bypass 2 electric current of thyristor controlled series compensation and are turned off to zero for generation during through transport row, after failure vanishes, close
The connecting valve 3 between thyristor controlled series compensation 2 and voltage-source type valve group 1 is bypassed, voltage-source type valve group 1 accesses, and restarts direct current transportation
System；For voltage-source type valve group 1 also with during other valve terminal series operations occur instantaneously cannot self-healing failure, bypass
Thyristor controlled series compensation 2 or the offer current path of bypass cock 5 for bypassing thyristor controlled series compensation 2 both ends parallel connection, ensure that other valve groups are normal
Operation.
Embodiment 1：
Fig. 4 shows that both ends are all based on the flexible DC power transmission embodiment of voltage source converter.Rectification side voltage-source type
The alternating current of AC system 42 is converted to direct current by valve group 41, and inverter side voltage-source type valve group 1 is sent to by DC line 45,
Direct current is converted into alternating current and gives AC system 43.More preferably, voltage-source type valve group 1 is using half-bridge structure submodule composition
Modularization multi-level converter.
When the generation minor failure of AC system 43, when voltage-source type valve group 1 does not need to exit, as single phase ac is grounded event
Barrier uses rectification side the modular multi-electrical-level voltage source current converter of half-bridge structure, after detecting overvoltage or overcurrent, closes rapidly
Lock transverter；The modular multi-electrical-level voltage source current converter and dc circuit breaker of half-bridge structure are used for rectification side, is detected
After overvoltage or overcurrent, dc circuit breaker is disconnected rapidly；Rectification side is changed using the modular multilevel voltage source of full bridge structure
Device is flowed, after detecting overvoltage or overcurrent, voltage is adjusted rapidly, reduces power.Above-mentioned three kinds of schemes are all the controls by rectification side
Ability processed can eliminate overvoltage or overcurrent.
When catastrophe failure occurs for AC system 43, when voltage-source type valve group 1 needs to exit, such as three-phase alternating current short trouble,
The power of inverter side voltage source converter cannot normally be sent out, if rectification side has little time to adjust, rectification side voltage source converter
Continue to charge to inverter side voltage source converter, inverter side voltage source converter can be caused severe overvoltage, over-current phenomenon avoidance occur.For
Inverter side voltage source converter is avoided to damage, detects that catastrophe failure occurs for AC system or transverter voltage, electric current surpass
Threshold value is crossed, input bypass thyristor controlled series compensation 2 disconnects the connecting valve 3 between bypass thyristor controlled series compensation 2 and voltage-source type valve group 1,
Control bypass 2 electric current of thyristor controlled series compensation is to zero shutdown, after failure vanishes, close bypass thyristor controlled series compensation 2 and voltage-source type valve group 1 it
Between connecting valve 3, voltage-source type valve group 1 accesses, and rectification side adjusts voltage and current, restarts straight-flow system.In order to ensure side
Logical 2 fast and reliable shutdown of thyristor controlled series compensation can also disconnect the switch on the major loop neutral conductor or 1 when smaller in DC current
46, close a switch 46 after current over-zero again.
Embodiment 2：
It based on line commutation transverter, receiving end is that the mixed DC based on voltage source converter is defeated that Fig. 5, which shows that sending end is,
Electric embodiment.The alternating current of AC system 52 is converted to direct current by rectification side current source type valve group 51, passes through DC line 55
Inverter side voltage-source type valve group 1 is sent to, direct current is converted to alternating current gives AC system 53.
When the generation minor failure of AC system 53, when voltage-source type valve group 1 does not need to exit, as single phase ac is grounded event
Hinder, the line commutation transverter in rectification side current source type valve group 51, after detecting overvoltage or overcurrent, adjust Trigger Angle and inhibit straight
Galvanic electricity stream increases, and overvoltage or overcurrent can be eliminated by the control ability of rectification side.
When catastrophe failure occurs for AC system 53, when voltage-source type valve group 1 needs to exit, such as three-phase alternating current short trouble,
The power of inverter side voltage source converter cannot normally be sent out, whole since rectification side line commutation transverter adjusting angle is slower
Stream side line commutation transverter continues to charge to inverter side voltage source converter, inverter side voltage source converter can be caused to occur tight
Weight overvoltage, over-current phenomenon avoidance.In order to avoid inverter side voltage source converter damage, detect AC system occur catastrophe failure or
Transverter voltage, controller, input bypass thyristor controlled series compensation 2, disconnect bypass thyristor controlled series compensation 2 and voltage-source type valve group
Connecting valve 3 between 1, control bypass 2 electric current of thyristor controlled series compensation is turned off to zero, after failure vanishes, closes bypass thyristor controlled series compensation 2
Connecting valve 3 between voltage-source type valve group 1, voltage-source type valve group 1 access.In order to ensure to bypass thyristor controlled series compensation 2 quickly
Reliable turn-off, can also be smaller in DC current or disconnects switch 56 on the major loop neutral conductor when zero, is closed again after current over-zero
Upper switch 56.
Embodiment 3：
Fig. 6 show sending end be based on line commutation transverter cascaded structure, receiving end be based on line commutation transverter and
The Hybrid HVDC embodiment of voltage source converter series connection.Rectification side current source type valve group 61 and 67 is by the friendship of AC system 62
Galvanic electricity is converted to direct current, inverter side current source type valve group 68 and voltage-source type valve group 1 is sent to by DC line 65, by direct current
Electricity is converted to alternating current and gives AC system 63.The cathode of current source type valve group 68 is connected with the anode of voltage-source type valve group 1.
When the generation minor failure of AC system 63, when voltage-source type valve group 1 does not need to exit, as single phase ac is grounded event
Hinder, commutation failure occurs for the line commutation transverter in inverter side current source type valve group 68, and voltage source converter realizes that failure is worn
More, it after rectification side line commutation transverter receives the fault message that inverter side is sent, adjusts Trigger Angle and DC current is inhibited to increase
Add, overvoltage or overcurrent can be eliminated by the control ability of rectification side.
When the generation catastrophe failure of AC system 63, when voltage-source type valve group 1 needs to exit, if instantaneously can be self-healing
Failure, such as three-phase alternating current instantaneous short-circuit failure, the power of inverter side voltage source converter instantaneously cannot normally be sent out, due to rectification
Side line commutation transverter adjusting angle is slower, and inverter side line commutation transverter voltage falls to zero, rectification side current source type
Transverter only to inverter side voltage source converter charge, can cause inverter side voltage source converter occur more seriously overvoltage,
Over-current phenomenon avoidance；In order to avoid inverter side voltage source converter damages, detect that AC system occurs catastrophe failure and causes transverter
Voltage, controller, input bypass thyristor controlled series compensation 2, disconnect between bypass thyristor controlled series compensation 2 and voltage-source type valve group 1
Connecting valve 3, control bypass 2 electric current of thyristor controlled series compensation to zero shutdown after failure vanishes, closes bypass thyristor controlled series compensation 2 and electricity
Connecting valve 3 between potential source type valve group 1, voltage-source type valve group 1 access；In order to ensure that bypass thyristor controlled series compensation 2 is fast and reliable
Shutdown, can also be smaller in DC current or disconnects switch 66 on the major loop neutral conductor when zero, is closed out again after current over-zero
Close 66.
When the generation catastrophe failure of voltage-source type valve group 1, when voltage-source type valve group 1 needs to exit, if instantaneously cannot be certainly
The failure of recovery, such as transverter faults itself, voltage source converter needs exit, and input bypass thyristor controlled series compensation 2 disconnects bypass
Connecting valve 3 between thyristor controlled series compensation 2 and voltage-source type valve group 1, in order to ensure that current source type valve group 68 continues to run with, bypass
Thyristor controlled series compensation 2, which continues to flow through electric current or closes bypass cock 5, provides current path.
Above example is merely illustrative of the invention's technical idea, 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 solution each falls within the scope of the present invention
Within.
Claims (15)
1. a kind of voltage source converter protects circuit, it is characterised in that：The voltage source converter protection circuit is used to protect
Voltage-source type valve group, including at least bypass two elements of thyristor controlled series compensation and a connecting valve, connection mode is in voltage source
Type valve group both ends parallel connection bypass thyristor controlled series compensation, bypasses between the anode of thyristor controlled series compensation and the anode of voltage-source type valve group or other
It is logical to be connected between the cathode of thyristor controlled series compensation and the cathode of voltage-source type valve group at least through a connecting valve.
2. a kind of voltage source converter protection circuit as described in claim 1, it is characterised in that：The voltage-source type valve group
The voltage in a distant place is connected to by DC line including at least a voltage source converter or by anode and cathode common end
Source transverter.
3. a kind of voltage source converter protection circuit as claimed in claim 2, it is characterised in that：The voltage source in the distant place
It is connected between transverter and DC line at least through a connecting valve.
4. a kind of voltage source converter protection circuit as claimed in claim 2, it is characterised in that：The voltage source converter is
It is any one or more below：Two level converters, diode-clamped multilevel converter, modularization multi-level converter MMC,
Mixed multi-level transverter HMC, two level cascade current converter CSL or two level converter CTL of stack, by what can be turned off
Full-control type power semiconductor forms.
5. a kind of voltage source converter protection circuit as described in claim 1, it is characterised in that：Bypass the sun of thyristor controlled series compensation
Increase between the anode of pole and voltage-source type valve group or between the cathode of bypass thyristor controlled series compensation and the cathode of voltage-source type valve group
Current-limiting reactor.
6. a kind of voltage source converter protection circuit as described in claim 1, it is characterised in that：The bypass thyristor controlled series compensation
Only comprising a bridge arm, it is made of multiple Thyristors in series, and include corresponding control protection electric circuit；Or the brilliant lock of bypass
Pipe valve group is the bypass pair of line commutation transverter in parallel or the quick phase shift reality of line commutation transverter for passing through the parallel connection
It is existing.
7. a kind of voltage source converter protection circuit as claimed in claim 6, it is characterised in that：After multiple Thyristors in series
Beginning or end series direct current change-over switch or isolation switch.
8. a kind of voltage source converter protection circuit as described in claim 1, it is characterised in that：In bypass thyristor controlled series compensation two
End bypass cock in parallel, the bypass cock are following any：Direct current change-over switch, isolation switch or direct current change-over switch and
Isolation switch.
9. a kind of voltage source converter protection circuit as described in claim 1, it is characterised in that：The connecting valve is electric power
Dc circuit breaker that electronic device is formed or it is direct current change-over switch or is isolation switch or is only one-way conduction
The diode or thyristor of ability or be above-mentioned arbitrary combination.
10. a kind of voltage source converter protection circuit as described in claim 1, it is characterised in that：The voltage-source type valve group
Be individually composed a direct current pole be either composed in series with other voltage-source type valve groups a direct current pole or with current source type valve
Group is composed in series a direct current pole.
11. a kind of voltage source converter suitable for claims 1 to 10 any one of them voltage source converter protection circuit
Guard method, it is characterised in that：When voltage-source type valve group detects that failure needs to exit, input bypass thyristor controlled series compensation disconnects
The connecting valve between thyristor controlled series compensation and voltage-source type valve group is bypassed, only has the voltage-source type valve group to run this pole,
Or the voltage-source type valve group also with this extremely his valve group series operation when occur instantaneously can self-healing failure, control bypass
Thyristor controlled series compensation electric current is turned off to zero, and after failure vanishes, the connection closed between bypass thyristor controlled series compensation and voltage-source type valve group is opened
It closes, the access of voltage-source type valve group coordinates control by rectification side and inverter side, restarts DC transmission system；For the voltage
Source type valve group also with this extremely his valve terminal series operation when occur instantaneously cannot self-healing failure, by bypassing thyristor
Valve group or the bypass cock offer current path for bypassing thyristor controlled series compensation both ends parallel connection, are latched the voltage-source type valve group or direct current
Transmission system.
12. a kind of voltage source converter guard method as claimed in claim 11, it is characterised in that：The voltage-source type valve group
Detect that failure includes control system failure, valve area failure, main transformer area failure and fault in ac transmission system；The needs exit
Specific judgment mode be：It is more than threshold value by the DC voltage, DC current or bridge arm current that detect voltage-source type valve group；Or
Person passes through detection sub-module voltage or controller；Or by detecting alternating voltage or alternating current indirect predictions or auxiliary
Help judgement；Or by the way that the appearance of voltage-source type valve group stoppage in transit signal, protection signal occur, block signal occurs or operation is believed
It number disappears and to judge；Or occur judging by main transformer protection action signal.
13. a kind of voltage source converter guard method as claimed in claim 11, it is characterised in that：The brilliant lock of control bypass
Pipe valve group electric current is to dominate that bypass thyristor controlled series compensation electric current is controlled to pass to zero or by fault message by our station to zero shutdown
It is sent to station, control bypass thyristor controlled series compensation electric current is led to station owner and coordinates control bypass thyristor controlled series compensation electricity to zero or two stations
Flow to zero；The control bypass thyristor controlled series compensation electric current to zero method is to apply zero-pressure or back-pressure in bypass thyristor controlled series compensation,
Or the direct current change-over switch in DC transmission system current loop is disconnected to realize.
14. a kind of voltage source converter guard method as claimed in claim 11, it is characterised in that：The instantaneous energy self- recoverage
Failure refer to the failure voluntarily removed or removed by Control protection system in a short time, after fault clearance, direct current transportation
System can be continued to run with according to the former method of operation；It is described instantaneously cannot self-healing failure refer to need the long period could from
Row is removed or is removed by Control protection system or need the failure that maintenance could remove of stopping transport, and direct current is defeated in a short time
Electric system needs the former method of operation of change that can just continue to run with.
15. a kind of voltage source converter suitable for claims 1 to 10 any one of them voltage source converter protection circuit
Protective device, which is characterized in that described device includes detection unit, protection location and control unit, wherein：
Detection unit, the DC voltage of detection voltage-source type valve group, DC current, bridge arm current, voltage, the electric current of submodule,
Alternating voltage, the alternating current of incoming transport system, voltage-source type valve group stoppage in transit signal, protection signal, block signal, fortune
Row signal, main transformer protection action signal；The appearance of voltage-source type valve group failure is judged whether there is, there is then trigger protection unit；
Protection location, when judging that voltage-source type valve group failure occurs, input bypass thyristor controlled series compensation disconnects bypass thyristor valve
Connecting valve between group and voltage-source type valve group, and trigger control unit；
Control unit, for only have the voltage-source type valve group to run or the voltage-source type valve group also with other valve group strings
Instantaneously the self-healing failure of energy, control bypass thyristor controlled series compensation electric current and are turned off to zero for generation during through transport row, after failure vanishes, close side
Logical connecting valve between thyristor controlled series compensation and voltage-source type valve group, voltage-source type valve group access, restarts DC transmission system；It is right
When the voltage-source type valve group is also with other valve terminal series operations occur instantaneously cannot self-healing failure, pass through bypass
Thyristor controlled series compensation or the bypass cock offer current path for bypassing thyristor controlled series compensation both ends parallel connection, ensure that other valve groups are normally transported
Row.
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| CN109742783B (en) * | 2018-11-14 | 2022-07-22 | 南京南瑞继保电气有限公司 | Method and device for online quitting voltage source type current converter of hybrid direct-current transmission system |
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| CN113067467B (en) * | 2021-04-09 | 2022-07-01 | 湖南科瑞变流电气股份有限公司 | Control method and device of rectification system and related components |
| CN117039820A (en) * | 2023-09-07 | 2023-11-10 | 国网经济技术研究院有限公司 | Surplus power overvoltage suppression method and system for high-capacity flexible direct current converter valve |
| CN117039820B (en) * | 2023-09-07 | 2024-03-19 | 国网经济技术研究院有限公司 | Surplus power overvoltage suppression method and system for high-capacity flexible direct current converter valve |
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