CN106602531A - Bridge arm bypass protection circuit of modularization multi-level converter aiming at direct current short circuit fault - Google Patents
Bridge arm bypass protection circuit of modularization multi-level converter aiming at direct current short circuit fault Download PDFInfo
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- CN106602531A CN106602531A CN201610909236.6A CN201610909236A CN106602531A CN 106602531 A CN106602531 A CN 106602531A CN 201610909236 A CN201610909236 A CN 201610909236A CN 106602531 A CN106602531 A CN 106602531A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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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
- H02H7/122—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 for inverters, i.e. dc/ac converters
-
- 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
- H02H7/125—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 for rectifiers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a bridge arm bypass protection circuit of a modularization multi-level converter aiming at a direct current short circuit fault, and belongs to a converter fault protection device range. The protection circuit is realized by arranging a bridge arm bypass, which is formed by serially connecting a bypass thyristor and a bypass resistor together, between the upper bridge arm and the lower bridge arm of every phase of the modularization multi-level converter. During common function, the bypass thyristor is in an off state, and the bridge arm bypass does not work. After the fault occurs, a sub-module IGBT is locked, and at the same time, the bypass thyristor is conducted, and because of the shunting function of the bridge arm bypass, fault current flowing through sub-module devices is reduced, and attenuation of direct current side current is also accelerated after trip-out of an alternating circuit breaker, and therefore fault recovery time is reduced, and a good fault protection function is provided for the devices and the alternating current system. For a system adopting the direct current circuit breaker, the protection circuit is used to reduce the fault current of the direct current side, and therefore a requirement on the switching-on/off of the current of the direct current circuit breaker is reduced, and economic performance and reliability are improved.
Description
Technical field
The invention belongs to the protection device scope of inverter short trouble, more particularly to a kind of modularization multi-level converter
Bridge arm bypass protection circuit to direct-current short circuit failure.It is double suitable for the flexible high pressure DC transmission system DC of pseudo- dipolar configuration
The situation of pole short trouble, and the flexible high pressure DC transmission system DC monopolar grounding fault or bipolar short of true dipolar configuration
The situation of road failure.
Background technology
At present, modularization multi-level converter typically adopts semi-bridge type submodule, during system generation direct-current short circuit failure
Protected mode is typically first locking submodule IGBT, recycles AC circuit breaker to be tripped.Under this protected mode, to
The fault current of submodule device is flow through in restriction, and unique method is increase bridge arm inductance, although but the value of increase inductance can
To reduce fault current, but while and extend the time of DC side current attenuation after AC circuit breaker tripping operation, this can not only increase
Plus the time needed for fault recovery, it is also possible to the stability of AC system is produced serious influence.
The content of the invention
It is an object of the invention to provide a kind of bridge arm bypass protection of modularization multi-level converter to direct-current short circuit failure
Circuit, including the situation of the bipolar short trouble of flexible high pressure DC transmission system DC suitable for pseudo- dipolar configuration, Yi Jizhen
The situation of the flexible high pressure DC transmission system DC monopolar grounding fault or bipolar short trouble of dipolar configuration；Its feature exists
In, the bridge arm bypass protection circuit be by two bridge arm inductance two ends of the facies unit in modularization multi-level converter simultaneously
One bridge arm bypass of connection is realized；That is one end of bridge arm bypass is connected with the upper end of upper bridge arm inductance, and the other end and lower bridge arm are electric
The lower end of sense is connected, and makes bridge arm bypass form parallel relationship with upper and lower bridge arm inductance.Wherein, the phase of modularization multi-level converter
Unit by constituting bridge arm after multiple submodule series connection, respectively connect again by upper and lower bridge arm；Bridge arm bypass by
It is in series with a bypass resistance again after two bypass IGCT reverse parallel connections.Two bypass IGCT reverse parallel connections are to consider
There are two kinds of mode of operations of rectification and inversion to inverter and arrange, to ensure that the electric current in bridge arm bypass can two-way circulate.
Under inverter normal operating condition, bypass IGCT is off state, and bridge arm bypass does not work, inverter
Run in a conventional manner.After inverter occurs direct-current short circuit failure, while locking submodule IGBT bypass bridge arm
In bypass turn on thyristors, i.e. conducting direction that IGCT consistent with the sense of current of inductive discharge it is open-minded, separately
One still in off state.As the sense of current of inductive discharge depends on the mode of operation of inverter, therefore two bypasses are brilliant
The state of cut-offfing of brake tube also depends on the mode of operation of inverter：Rectification mode or inverter mode.Now, bridge arm inductance not only leads to
Cross submodule diode and the electric discharge of dc-side short-circuit point, additionally it is possible to which the bypass IGCT and bypass resistance in being bypassed by bridge arm is put
Electricity.Therefore by the value of selection bypass resistance, inductive current can be made most of and is flow through from bridge arm bypass, be substantially reduced and flow through
The fault current of submodule and DC side, so as to antithetical phrase module device plays error protection effect.
System is cut off according to AC circuit breaker, the fault current of AC feed-in after tripping operation, and bridge arm inductance continues logical
Cross above-mentioned two paths electric discharge；The shunting action of bridge arm bypass accelerates the decay of DC side fault current, so as to shorten event
Hinder recovery time, reduce the adverse effect that failure is caused to AC system stability.Deng the arc extinction and surrounding of trouble point
After the insulation recovery of medium, AC circuit breaker is closed a floodgate again.If reclosing success, submodule IGBT is unlocked, system just may be used
Recover normal to run；If unsuccessful reclosing, secondary trip is carried out.Due to the presence of bypass resistance, the electric current in bridge arm bypass
Also gradually decay, when current attenuation to bypass IGCT maintenance electric current below when, bypass IGCT just voluntarily have turned off.
According to dc circuit breaker, after tripping operation, the fault current of DC side is to sever immediately upon impact by the firing pin system, enters after a period of time again
Row reclosing operation.In this case the dump energy of bridge arm inductance is all discharged by bridge arm bypass, with bypass
The decay of electric current, bypass IGCT voluntarily can be turned off.As bridge arm bypass serves shunting action after failure, reduce and flow through directly
The fault current of stream side, so reducing the short circuit current for needing dc circuit breaker to cut-off, alleviates the burden of dc circuit breaker.
Beneficial effects of the present invention：In normal operation, bypass IGCT is off state, and bridge arm bypass is not acted as
With will not have any impact to the AC of modularization multi-level converter or DC side.After breaking down, can not only
The fault current of submodule device is flow through in reduction, moreover it is possible to accelerate the decay of DC side electric current after AC circuit breaker tripping operation, so as to contract
Short failure recovery time, plays good error protection effect to device and AC system.For using dc circuit breaker being
System, protection circuit can reduce the fault current of DC side, contribute to mitigating the burden of dc circuit breaker, reduce to direct current interruption
The requirement of the specified drop-out current of device.The bypass IGCT good economy performance that the present invention is adopted, through-current capability are strong, and with by-pass current
Decay can voluntarily turn off, it is to avoid complicated shut-off operation.
Description of the drawings：
Fig. 1 is applicable fault type schematic diagram, a) is wherein pseudo- bipolar DC system DC bipolar short trouble schematic diagram, b)
It is true bipolar DC system direct current monopolar grounding fault and bipolar short trouble schematic diagram；
Fig. 2 is the modular multilevel converter structure schematic diagram with bridge arm bypass protection circuit；
Fig. 3 is single-phase bridge arm inductive discharge path schematic diagram；
Fig. 4 is bridge arm bypass IGCT parallel-connection structure schematic diagram；
Fig. 5 is bridge arm bypass Thyristors in series structural representation.
The part that label is represented in figure is followed successively by：1. submodule, 2. by the single-phase bridge arm that multiple submodule is in series, 3.
Bridge arm inductance, 4. bridge arm bypass, 4-1. bypass IGCTs, 4-2. bypass IGCTs, 4-3. bypass resistances, 5. AC circuit breaker,
6. DC side circuit, 7. short circuiting transfer resistance.
Specific embodiment
The present invention provides a kind of bridge arm bypass protection circuit of modularization multi-level converter to direct-current short circuit failure, this
The situation of the bright bipolar short trouble of flexible high pressure DC transmission system DC suitable for pseudo- dipolar configuration, and true dipolar configuration
Flexible high pressure DC transmission system DC monopolar grounding fault or bipolar short trouble situation, below in conjunction with the accompanying drawings to this
It is bright to be further described.
As shown in Figure 1, it is adaptable to a) pseudo- bipolar DC system DC bipolar short trouble schematic diagram, b) true bipolar DC system direct current list
Pole ground fault and bipolar short trouble schematic diagram；As a example by using AC circuit breaker suitable for pseudo- dipolar configuration system, tool
Body structure is as shown in Fig. 2 the inverter in figure constitutes bridge arm 2,2 each series connection of upper and lower bridge arm one after being connected by multiple submodule 1
The facies unit of modularization multi-level converter is constituted after bridge arm inductance 3；Bridge arm bypass 4 bypasses IGCT by 4-1 and 4-2 bypasses are brilliant
In series with bypass resistance 4-3 again after brake tube reverse parallel connection, one end of bridge arm bypass 4 is connected with the upper end of upper bridge arm inductance 3,
The other end is connected with the lower end of lower bridge arm inductance 3, makes bridge arm bypass 4 form parallel relationship with upper and lower bridge arm inductance 3.System is normal
During operation, 4-1 bypass IGCTs and 4-2 bypass IGCTs are in off state.When DC side circuit 6 occurs bipolar short circuit event
After barrier, the IGBT inside locking submodule 1 immediately, while making a bypass turn on thyristors in bridge arm bypass 4：With inverter
As a example by being operated in rectification mode, triggering bypass IGCT 4-1；If inverter is operated in inverter mode, triggering bypass IGCT
Only one of which conducting in the bypass IGCT of 4-2, i.e., two, another is still in off state.Now, bridge arm inductance 3 is according to Fig. 3
Shown discharge path is discharged, and in figure 3, inductive current is on the one hand by the diode and direct current in upper and lower bridge arm 2
The short circuiting transfer resistance 7 of side forms loop, on the other hand forms loop by bypassing IGCT 4-1 and bypass resistance 4-3.Pass through
The value of bypass resistance 4-3 is selected, and inductive current can be made most of and flow through from bridge arm bypass 4, bridge arm 2 be flow through so as to reduce
Fault current, it is to avoid device is damaged by overcurrent.
After AC circuit breaker 5 trips, bridge arm inductance 3 continues through the two paths electric discharge shown in Fig. 3, bridge arm bypass 4
Shunting action accelerates the decay of the fault current for flowing through short circuiting transfer resistance 7, so as to shorten failure recovery time, accelerates
The recovery process of system.Due to the presence of bypass resistance 4-3, the electric current in bypass is also gradually decayed, by current attenuation to 4-1
When below the maintenance electric current of road IGCT, 4-1 bypass IGCTs just voluntarily have turned off.
The process of whole fault clearance is divided into following step：
1. direct-current short circuit failure there is under system normal operating condition；
2. locking submodule IGBT after failure is detected, and triggers bypass IGCT 4-1 (or 4-2)；
3. AC circuit breaker 5 trips；
4. DC side electric current is gradually decayed, 5 reclosing of AC circuit breaker after a period of time；
5. while step 4, the electric current in bridge arm bypass 4 is gradually decayed, and after decaying to certain value, 4-1 (or 4-2) is other
Road IGCT is voluntarily turned off；
6. submodule IGBT, system restarting are unlocked after reclosing success；If unsuccessful reclosing, secondary jump is carried out
Lock.
System only need to be changed to direct current the AC circuit breaker in above-mentioned 3rd and the 4th step and break according to dc circuit breaker
Road device, but have some differences to be：After the tripping operation of step 3 dc circuit breaker, in step 4, DC side fault current is immediately
It is cut off, now the dump energy of bridge arm inductance is all discharged by bridge arm bypass.
In the setting that 4-1 bypasses IGCT and 4-2 bypass IGCTs, overcurrent is born in order to avoid bypassing IGCT,
Can realize shunting (as shown in Figure 4) using multiple IGCTs structure in parallel.Bridge is connected in parallel in order to avoid bypassing IGCT
Arm inductance both sides and bear overvoltage, the structure of multiple Thyristors in series can be adopted realizing partial pressure (as shown in Figure 5).Work as handle
Multiple IGCTs in parallel or series when, the consistent IGCT of performance should be chosen as far as possible, to ensure electric current that each IGCT is got
Or voltage is impartial, and can simultaneously turn on or turn off.
In the selection of bypass resistance 4-3, from from the perspective of protection submodule device, the value of bypass resistance is less, stream
The fault current for crossing bridge arm bypass 4 is bigger, and the fault current for flowing through bridge arm 2 is less, is more conducive to the protection of device.But,
The value of bypass resistance is too small, and the current attenuation during bridge arm can be caused to bypass is excessively slow, and 4-1 (or 4-2) bypass IGCTs can bear
Prolonged overcurrent, it is possible to burn out because overheated.So, the factor that should consider these two aspects is electric to choose bypass
Resistance.The current value of bridge arm by-pass shunt is proportional to the ratio of short circuiting transfer resistance and bypass resistance, it is considered to most tight in Practical Project
The situation of weight, i.e. failure occur in inverter direct current exit, and now the value minimum of short circuiting transfer resistance is (typically in a little Europe of zero point
Between nurse to several ohm), then the higher limit of bypass resistance can be determined by the value of minimum short circuiting transfer resistance.On the other hand, bridge
In arm bypass, the time constant of current attenuation depends on the ratio of bridge arm inductance and bypass resistance, and the value of bridge arm inductance is different, electricity
The time constant of stream decay is also different, so the lower limit of bypass resistance needs to be engaged with the value of converter bridge arm inductance.
Additionally, it is similar with the setting of bypass IGCT, to avoid bypass resistance from bearing overcurrent or overvoltage, it would however also be possible to employ will be multiple
Resistor coupled in parallel or the structure of series connection.
Claims (8)
1. bridge arm bypass protection circuit of the modularization multi-level converter to direct-current short circuit failure, including suitable for pseudo- dipolar configuration
The bipolar short trouble of flexible high pressure DC transmission system DC and true dipolar configuration flexible high pressure DC transmission system it is straight
The situation of stream monopolar grounding fault or bipolar short trouble；It is characterized in that：Described bridge arm bypass protection circuit be by
What one bridge arm bypass (4) of two ends parallel connection of two bridge arm inductance (3) of the facies unit of modularization multi-level converter was realized, i.e.,
One end of bridge arm bypass (4) is connected with the upper end of upper bridge arm inductance (3), and the other end is connected with the lower end of lower bridge arm inductance (3), is made
Bridge arm bypasses (4) and forms parallel relationship with upper and lower bridge arm inductance (3)；Wherein, the facies unit of modularization multi-level converter is by more
Bridge arm (2) is constituted after individual submodule (1) series connection, respectively one bridge arm inductance (3) of series connection is constituted upper and lower bridge arm afterwards again；Bridge arm is bypassed
(4) it is in series with bypass resistance (4-3) again after bypassing IGCT and 4-2 bypass IGCT reverse parallel connections by 4-1；It is described two
Bypass IGCT reverse parallel connection allows for inverter to be had two kinds of mode of operations of rectification and inversion and arranges, to ensure by bridge arm
Electric current in road can two-way circulate.
2. bridge arm bypass protection circuit of the modularization multi-level converter to direct-current short circuit failure according to claim 1, its
It is characterised by：The bypass IGCT is off state under inverter normal operating condition, and bridge arm bypass does not work, changes
Stream device is run in a conventional manner.
3. modularization multi-level converter tackles the bridge arm bypass protection circuit of direct-current short circuit failure according to claim 1,
It is characterized in that：After the modularization multi-level converter occurs direct-current short circuit failure, make while locking submodule IGBT
A bypass turn on thyristors in bridge arm bypass, bridge arm inductance can be carried out by bridge arm bypass and two paths of direct current side loop
Electric discharge；Now, only conducting direction that IGCT consistent with the sense of current of inductive discharge is open-minded, the brilliant lock of another bypass
Pipe is still in off state.
4. bridge arm bypass protection circuit of the modularization multi-level converter to direct-current short circuit failure according to claim 3, its
It is characterised by：It is rectification mode or inversion mould that the sense of current of the bridge arm inductive discharge depends on the mode of operation of inverter
Formula, therefore the state of cut-offfing of two bypass IGCTs also depends on the mode of operation of inverter；Bridge arm inductance not only passes through submodule
Diode and the electric discharge of dc-side short-circuit point, additionally it is possible to the bypass IGCT and bypass resistance electric discharge in being bypassed by bridge arm；Therefore
By the value for selecting bypass resistance, inductive current can be made most of and flow through from bridge arm bypass, be substantially reduced and flow through bridge arm submodule
The fault current of block, so as to antithetical phrase module device plays error protection effect.
5. bridge arm bypass protection circuit of the modularization multi-level converter to direct-current short circuit failure according to claim 3, its
It is characterised by：Flexible direct current power transmission system is cut off according to AC circuit breaker, the fault current of AC feed-in after tripping operation, bridge
Arm inductance continues through bridge arm bypass and two paths of direct current side loop discharge；The shunting action of bridge arm bypass accelerates DC side
The decay of fault current, so as to shorten failure recovery time, reduces the unfavorable shadow that failure is caused to AC system stability
Ring；After insulation recovery Deng the arc extinction and surrounding medium of trouble point, AC circuit breaker is closed a floodgate again；If closing a floodgate into again
Work(, then unlock IGBT, and system just can recover normal operation；If closing a floodgate again failure, secondary trip is carried out；Due to bypass resistance
Presence, bridge arm bypass in electric current also gradually decay, when current attenuation to bypass IGCT maintenance electric current below when, bypass
IGCT is just voluntarily turned off.
6. bridge arm bypass protection circuit of the modularization multi-level converter to direct-current short circuit failure according to claim 3, its
It is characterised by：According to dc circuit breaker, after tripping operation, the fault current of DC side is to sever immediately upon impact by the firing pin flexible direct current power transmission system, and one
Reclosing operation is carried out again after the section time；In this case the dump energy of bridge arm inductance is all released by bridge arm bypass
Put, with the decay of by-pass current, bypassing IGCT voluntarily can turn off；As after failure, shunting action is played in bridge arm bypass, subtract
The little fault current for flowing through DC side, so reducing the short circuit current for needing dc circuit breaker to cut-off, alleviates direct current and breaks
The burden of road device.
7. bridge arm bypass protection circuit of the modularization multi-level converter to direct-current short circuit failure according to claim 1, its
It is characterised by：Described two bypass IGCT reverse parallel connections, when avoiding bypass IGCT from bearing overcurrent, each using multiple
After IGCT first parallel connection again reverse parallel connection realizing shunting；It is connected in parallel on bridge arm inductance both sides and bore when avoids bypassing IGCT
During voltage, after each first being connected using multiple IGCTs again reverse parallel connection realizing partial pressure.
8. bridge arm bypass protection circuit of the modularization multi-level converter to direct-current short circuit failure according to claim 1, its
It is characterised by：Bypass Thyristors in series after the bypass resistance and reverse parallel connection, when avoiding bypass resistance from bearing overcurrent,
Shunting is realized using multiple resistor coupled in parallel；When avoiding bypass resistance from bearing overvoltage, realized using multiple resistant series
Partial pressure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610909236.6A CN106602531B (en) | 2016-10-18 | 2016-10-18 | Bridge arm bypass protection circuit of the modularization multi-level converter to direct-current short circuit failure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610909236.6A CN106602531B (en) | 2016-10-18 | 2016-10-18 | Bridge arm bypass protection circuit of the modularization multi-level converter to direct-current short circuit failure |
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| CN106602531A true CN106602531A (en) | 2017-04-26 |
| CN106602531B CN106602531B (en) | 2019-04-02 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107706894A (en) * | 2017-11-15 | 2018-02-16 | 国家电网公司 | A kind of monopole fault isolation system of true bipolar flexible DC transmission engineering |
| CN107968413A (en) * | 2017-11-06 | 2018-04-27 | 东南大学 | A kind of THE UPFC structure for possessing failure current limit ability |
| CN109327021A (en) * | 2018-11-28 | 2019-02-12 | 天津大学 | Economical fault current limiter and control strategy suitable for multiterminal flexible direct current power grid |
| CN109617439A (en) * | 2018-12-28 | 2019-04-12 | 东南大学 | A kind of MMC topology with direct-current short circuit fault current blocking ability |
| CN109861567A (en) * | 2018-12-20 | 2019-06-07 | 华中科技大学 | A kind of modularization multi-level converter and dc circuit breaker control method for coordinating |
| CN110611421A (en) * | 2019-09-16 | 2019-12-24 | 山东泰开高压开关有限公司 | Modular multilevel converter bypass mechanism and working method |
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| CN111030493A (en) * | 2019-12-31 | 2020-04-17 | 中国南方电网有限责任公司超高压输电公司 | Submodule of modular multilevel converter and protection circuit thereof |
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| CN107968413A (en) * | 2017-11-06 | 2018-04-27 | 东南大学 | A kind of THE UPFC structure for possessing failure current limit ability |
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