CN207896655U - A kind of voltage source converter protection circuit - Google Patents
A kind of voltage source converter protection circuit Download PDFInfo
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- CN207896655U CN207896655U CN201820299323.9U CN201820299323U CN207896655U CN 207896655 U CN207896655 U CN 207896655U CN 201820299323 U CN201820299323 U CN 201820299323U CN 207896655 U CN207896655 U CN 207896655U
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Abstract
The utility model 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 at least through a connecting valve between the anode and the anode of voltage-source type valve group of bypass thyristor controlled series compensation or between the cathode and the cathode of voltage-source type valve group of bypass thyristor controlled series compensation; voltage source converter can be protected; it prevents it from overvoltage, overcurrent occurs, and straight-flow system can be restarted after failure vanishes.
Description
Technical field
The utility model belongs to flexible DC power transmission, high-voltage dc transmission electrical domain, and in particular to a kind of voltage source converter
Protect circuit.
Background technology
Direct current transportation advantage based on voltage source converter is that controllability is high, can access passive system, does not need idle benefit
Repay device；Disadvantage is that transverter switching loss is big, when inverter side AC system or transverter break down, can be produced to transverter
Raw larger voltage and current impact, even transverter is damaged 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 suddenly be increased by perceiving DC voltage or DC current increase suddenly to inhibit
False voltage or electric current, but cannot in real time acquisition submodule voltage and current information, this is because rectification side obtain inversion
Side fault message communicates delay between there is station, and inverter side bridge arm current is not equal to DC current.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 uses transverter and mixing transverter concatenated based on voltage source converter based on line commutation,
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 even cannot be inverse to judge by detecting DC voltage
Become side voltage source converter and over-voltage fault occurs, can only rely on and be communicated between standing to obtain Inverter Station fault message, due to leading between station
There is delay in news, it is easy to lead to voltage source converter overvoltage and overcurrent.
Utility model content
The purpose of this utility model is to provide a kind of voltage source converter protection circuit, prevents voltage source converter from going out
Existing severe overvoltage or overcurrent, protect voltage-source type valve group reliability service.
In order to achieve the above objectives, the technical solution adopted in the utility model is：A kind of voltage source converter protection circuit,
For protecting voltage-source type valve group, bypass two elements of thyristor controlled series compensation and a connecting valve are included at least, connection type is
At voltage-source type valve group both ends, parallel connection bypasses thyristor controlled series compensation, bypasses the anode of the anode and voltage-source type valve group of thyristor controlled series compensation
Between or bypass thyristor controlled series compensation cathode and the cathode of voltage-source type valve group between be connected 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 at least through a connecting valve between the voltage source converter in an above-mentioned distant place and DC line.
Bypass thyristor controlled series compensation anode and the anode of voltage-source type valve group 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：It includes a bridge arm to bypass thyristor controlled series compensation only, 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 constitute dc circuit breaker or be direct current change-over switch,
Either isolation switch or be the only diode or thyristor of one-way conduction ability 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, or it is composed in series a direct current pole with current source type valve group.
The characteristics of the utility model：It proposes a kind of voltage source converter protection circuit, thyristor release is bypassed by input
DC energy, and current path is provided for other operation valve groups, prevent voltage source converter from overvoltage or overcurrent occur.
Description of the drawings
Fig. 1 is a kind of voltage source converter protection circuit structure of the utility model；
Fig. 2 is the flexible DC power transmission circuit structure that both ends are all based on voltage source converter；
Fig. 3 be sending end be based on line commutation transverter, receiving end be based on voltage source converter Hybrid HVDC electricity
Line structure；
It is based on the series connection of line commutation transverter, receiving end is changed based on line commutation transverter and voltage source that Fig. 4, which is sending end,
Flow the concatenated Hybrid HVDC circuit structure of device.
Specific implementation mode
The embodiments of the present invention are described by the following drawings, wherein identical component uses identical attached
Icon is remembered.Fig. 1 be the utility model proposes a kind of voltage source converter protect circuit, protection voltage-source type valve group 1 at least to wrap
3 two elements of thyristor controlled series compensation 2 and a connecting valve containing bypass, connection type are by the 1 both ends parallel connection of voltage-source type valve group
Logical thyristor controlled series compensation 2 bypasses between the anode X1 of thyristor controlled series compensation and the positive X3 of voltage-source type valve group or bypasses thyristor valve
It is connected at least through a connecting valve 3 between the cathode X2 and the cathode X4 of voltage-source type valve group of group.
Voltage-source type valve group 1 include at least a voltage source converter, or by anode and cathode common end pass through it is 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 positive X3 or between the cathode X2 and the cathode X4 of voltage-source type valve group of bypass thyristor controlled series compensation；It can
Selection of land, in bypass 2 both ends parallel connection direct change-over switch 5 of thyristor controlled series compensation.
Embodiment 1：
Fig. 2 shows the flexible DC power transmission embodiments that both ends are all based on voltage source converter.Rectification side voltage-source type
The alternating current of AC system 22 is converted to direct current by valve group 21, and inverter side voltage-source type valve group 1 is sent to by DC line 25,
Direct current is converted into alternating current and gives AC system 23.More preferably, voltage-source type valve group 1 is formed using half-bridge structure submodule
Modularization multi-level converter.
When the generation minor failure of AC system 23, when voltage-source type valve group 1 need not 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 that half-bridge structure is used for rectification side, detect
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 23, 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
It avoids inverter side voltage source converter from damaging, detects that catastrophe failure occurs for AC system or transverter voltage, electric current are super
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 access, rectification side adjust voltage and current, restart 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
26, close a switch 26 after current over-zero again.
Embodiment 2：
Fig. 3 shows that sending end be based on line commutation transverter, receiving end is that the mixed DC based on voltage source converter is defeated
Electric embodiment.The alternating current of AC system 32 is converted to direct current by rectification side current source type valve group 31, passes through DC line 35
It is sent to inverter side voltage-source type valve group 1, direct current, which is converted to alternating current, gives AC system 33.
When the generation minor failure of AC system 33, when voltage-source type valve group 1 need not exit, as single phase ac is grounded event
Hinder, the line commutation transverter in rectification side current source type valve group 31, after detecting overvoltage or overcurrent, adjusts 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 33, 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 36 on the major loop neutral conductor when zero, is closed again after current over-zero
Upper switch 36.
Embodiment 3：
Fig. 4 show sending end be based on line commutation transverter cascaded structure, receiving end be based on line commutation transverter and
The concatenated Hybrid HVDC embodiment of voltage source converter.Rectification side current source type valve group 41 and 47 is by the friendship of AC system 42
Galvanic electricity is converted to direct current, inverter side current source type valve group 48 and voltage-source type valve group 1 is sent to by DC line 45, by direct current
Electricity is converted to alternating current and gives AC system 43.The cathode of current source type valve group 48 is connected with the anode of voltage-source type valve group 1.
When the generation minor failure of AC system 43, when voltage-source type valve group 1 need not 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 48, 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.
It is self-healing if it is instantaneous energy when voltage-source type valve group 1 needs to exit when the generation catastrophe failure of AC system 43
Failure, if the power of three-phase alternating current instantaneous short-circuit failure, 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 it is more serious ground 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 is 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 46 on the major loop neutral conductor when zero, is closed out again after current over-zero
Close 46.
When voltage-source type valve group 1 occur catastrophe failure, when voltage-source type valve group 1 needs to exit, if it is instantaneously be unable to from
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 48 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 only to illustrate the technological thought of the utility model, and the protection model of the utility model cannot be limited with this
Enclose, it is every according to the utility model proposes technological thought, any change done on the basis of technical solution each falls within this reality
Within the scope of novel protected.
Claims (10)
1. a kind of voltage source converter protects circuit, it is characterised in that：The voltage source converter protection circuit is for protecting
Voltage-source type valve group, includes at least bypass two elements of thyristor controlled series compensation and a connecting valve, and connection type is in voltage source
The parallel connection of type valve group both ends bypasses 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 connected at least through a connecting valve between the cathode and the cathode of voltage-source type valve group of logical thyristor controlled series compensation.
2. a kind of voltage source converter as described in claim 1 protects circuit, it is characterised in that：The voltage-source type valve group
Including at least a voltage source converter, or pass through the positive voltage for being connected to a distant place by DC line with cathode common end
Source transverter.
3. a kind of voltage source converter as claimed in claim 2 protects circuit, it is characterised in that：The voltage source in the distant place
It is connected at least through a connecting valve between transverter and DC line.
4. a kind of voltage source converter as claimed in claim 2 protects circuit, 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 as described in claim 1 protects circuit, it is characterised in that：Bypass the sun of thyristor controlled series compensation
Increase between pole and the anode of voltage-source type valve group or between the cathode and the cathode of voltage-source type valve group of bypass thyristor controlled series compensation
Current-limiting reactor.
6. a kind of voltage source converter as described in claim 1 protects circuit, it is characterised in that：The bypass thyristor controlled series compensation
Only include a bridge arm, is made of multiple Thyristors in series, and include corresponding control protection electric circuit；Or the brilliant lock of the bypass
Pipe valve group is the bypass pair of line commutation transverter in parallel or the quick phase shift reality of line commutation transverter by the parallel connection
It is existing.
7. a kind of voltage source converter as claimed in claim 6 protects circuit, 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 as described in claim 1 protects circuit, 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 as described in claim 1 protects circuit, it is characterised in that：The connecting valve is electric power
Dc circuit breaker that electronic device is constituted 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 as described in claim 1 protects circuit, 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820299323.9U CN207896655U (en) | 2018-03-05 | 2018-03-05 | A kind of voltage source converter protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820299323.9U CN207896655U (en) | 2018-03-05 | 2018-03-05 | A kind of voltage source converter protection circuit |
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| CN207896655U true CN207896655U (en) | 2018-09-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108258657A (en) * | 2018-03-05 | 2018-07-06 | 南京南瑞继保电气有限公司 | A kind of voltage source converter protection circuit and guard method and device |
-
2018
- 2018-03-05 CN CN201820299323.9U patent/CN207896655U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108258657A (en) * | 2018-03-05 | 2018-07-06 | 南京南瑞继保电气有限公司 | A kind of voltage source converter protection circuit and guard method and device |
| CN108258657B (en) * | 2018-03-05 | 2023-06-27 | 南京南瑞继保电气有限公司 | Voltage source converter protection circuit, protection method and device |
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