CN108539717B - A kind of hybrid high voltage DC breaker of low-loss forced commutation type and working method - Google Patents
A kind of hybrid high voltage DC breaker of low-loss forced commutation type and working method Download PDFInfo
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- CN108539717B CN108539717B CN201810243933.1A CN201810243933A CN108539717B CN 108539717 B CN108539717 B CN 108539717B CN 201810243933 A CN201810243933 A CN 201810243933A CN 108539717 B CN108539717 B CN 108539717B
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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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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Abstract
The invention discloses a kind of hybrid high voltage DC breaker of low-loss forced commutation type and working method, which includes specified through-flow branch, electric current transfer branch, capacitive buffer branch, energy absorption branch and end of incoming cables A1 and leading-out terminal A2；Specified through-flow branch routes two Fast mechanical switch compositions；Electric current shifts branch routing diode, full-control type high-power electric and electronic switch and current-limiting reactor and constitutes；Capacitive buffer branch routing capacitor is constituted；Energy absorption branch routes arrester and constitutes；Compared with previous hybrid high voltage DC breaker, the present invention have the characteristics that it is specified it is through-flow under the conditions of be lost it is small and at low cost.Fault current is cut-off when short trouble can occur for DC line, and reliable, effective method is provided.
Description
Technical field
The present invention relates to a kind of hybrid high voltage DC breaker of forced commutation type, especially a kind of specified through-flow branch without
The hybrid high voltage DC breaker of low-loss forced commutation type and working method of power electronic devices, belong to direct current transmission and distribution net
The dc circuit breaker technical field of network application.
Background technique
DC transmission system has transmission line capability big, and electricity transmission process loss is low, and the power quality of transmission is high and without idle
The advantages of compensation.Meanwhile the proposition of green energy resource concept, the electric energy that the renewable energy such as wind energy, solar energy generate are direct current,
If being incorporated into AC network need to convert by DC/AC, the loss of energy will cause again during this period.Based on this, in recent years directly
Stream transmission system has obtained more and more concerns.And for DC transmission system, electric current is without natural zero-crossing point, so exchange
Breaker in system can not directly be applied in direct current system.Currently, the main implementation method of dc circuit breaker has: benefit
" zero crossing ", which is generated, with self-oscillation or capacitor preliminary filling electrical method cuts off DC current, but the method turn off process delay length, shutdown
Electric current is limited；Hybrid high voltage DC breaker, at present can hanging net operation be forced commutation type, in its specified through-flow branch
In have power electronic devices, it is desirable to provide cooling system, not only on-state loss increase and also additional energy supplement need to be provided.Together
When, due to the limitation of power electronic devices through-current capability and voltage class, the electronic power switch branch of mixed DC breaker
Can be series-parallel using a large amount of power electronics, to keep system cost excessively high.So development cost and the low direct current of running wastage are disconnected
Road device becomes an urgent demand.
Summary of the invention
In order to reduce in the specified through-flow situation of hybrid dc circuit breaker the on-state loss of electronic power switch device and
Waste of energy caused by its cooling system reduces to electronic power switch in the resistance to pressure request of interrupting process, while reducing mixing
The cost of breaker, the purpose of the present invention is to provide a kind of hybrid high voltage DC breaker of low-loss forced commutation type and works
Make method.
To achieve the above objectives, the present invention adopts the following technical scheme:
A kind of hybrid high voltage DC breaker of low-loss forced commutation type, by loss-free specified through-flow branch, electric current
It shifts branch, capacitive buffer branch, energy absorption branch and end of incoming cables A1 and leading-out terminal A2 is constituted,
The specified through-flow branch routing first Fast mechanical switch S1 and the second Fast mechanical switch S2 is in series, the
One end of one Fast mechanical switch S1 is connected with end of incoming cables A1, and the other end is connected with the second Fast mechanical switch S2；Second
One end of Fast mechanical switch S2 is connected with leading-out terminal A2；Since mechanical switch conduction impedance is low, make the breaker in volume
It is small to determine conduction loss under working condition；
The electric current transfer branch routes first diode D1 and the second diode D2, the first full-control type high-power electric electricity
Sub switch S3 and the second full-control type high-power electric and electronic switch S4 and pre-charge capacitor C1 is formed；The first diode
D1 anode is connected with the first full-control type high-power electric and electronic switch S3 collector, first diode D1 cathode and the second full control
Type high-power electric and electronic switch S4 collector is connected；Second diode D2 anode and the first full-control type high-power electric and electronic
Switch S3 emitter is connected, and the second diode D2 cathode is connected with the second full-control type high-power electric and electronic switch S4 emitter
It connects, four are sequentially connected in series as primary Ioops；The pre-charge capacitor C1, anode are connected to first diode D1 cathode and
Between two full-control type high-power electric and electronic switch S4 collectors, cathode is connected to the second diode D2 anode and the first full control
Between type high-power electric and electronic switch S3 emitter；
The electric current shifts branch, first diode D1 anode and the first full-control type high-power electric and electronic switch S3
Connecting line and the second diode D2 cathode and the second full-control type high-power electric and electronic switch S4 emitter between collector
Between connecting line respectively with the connection in specified through-flow branch between the first Fast mechanical switch S1 and Fast mechanical switch S2
One end of line and current-limiting reactor L1 are connected, and wherein the other end of current-limiting reactor L1 is connected with leading-out terminal A2；
The capacitive buffer branch routing buffer condenser C2 is constituted, and the one end buffer condenser C2 is connected with end of incoming cables A1,
The other end shifts the connecting line between branch and current-limiting reactor L1 with electric current by third diode D3 and is connected；Wherein,
Three diode D3 anode taps are connected with buffer condenser C2, and third diode D3 cathode terminal and electric current shift branch and current-limiting reactor
Connecting line between device L1 is connected；Third diode D3 effect is to prevent pre-charge capacitor C1 reversed to buffer condenser C2
Charging；
The energy absorption branch routing arrester MOV composition, arrester MOV are parallel to the both ends buffer condenser C2, inhale
The overvoltage that the energy and limitation buffering capacitor C2 for receiving buffering capacitor C2 are born.
The first Fast mechanical switch S1 is vacuum circuit breaker, gas circuit breaker or disconnecting switch；Second Quick mechanical
Switch S2 is vacuum circuit breaker or gas circuit breaker etc..
The first full-control type high-power electric and electronic switch S3 and the second full-control type high-power electric and electronic switch S4 are
IEGT, IGCT or IGBT；When normal running conditions, full-control type high-power electric and electronic switch is in an off state.
The working method of the hybrid high voltage DC breaker of low-loss forced commutation type, in accidental conditions
Under, electric current flows through the first Fast mechanical switch S1 and the second Fast mechanical switch S2 branch, since mechanical switch On-resistance is small,
To the hybrid dc circuit breaker be lost under nominal operating conditions it is small；
When short trouble occurs for system, fault current is flowed into from end of incoming cables A1, at this time to the first Fast mechanical switch S1
Action command is issued with the second Fast mechanical switch S2, makes the touching of the first Fast mechanical switch S1 and the second Fast mechanical switch S2
Head separation, trigger current shifts the first full-control type high-power electric and electronic switch S3 and the second full-control type in branch at the same time
High-power electric and electronic switch S4 is turned it on, and pre-charge capacitor C1 passes through the second full-control type high-power electric and electronic respectively and opens
Close S4, current-limiting reactor L1, the second Fast mechanical switch S2 and the first full-control type high-power electric and electronic circuit switch S3 are the
Two Fast mechanical switch S2 provide reverse current, make the second Fast mechanical switch S2 under conditions of generating artificial zero crossing and by
It rapidly switches off；During this period due to branch and buffering capacitor where the first Fast mechanical switch S1 and the second Fast mechanical switch S2
Device C2 is in parallel, so that the second Fast mechanical switch S2 is acted under zero initial voltage conditions；
After the second Fast mechanical switch S2 is fully disconnected, electric current is transferred to electric current transfer branch completely, at this time electric current stream
Through the first Fast mechanical switch S1, the first full-control type high-power electric and electronic switch S3, pre-charge capacitor C1, the second full-control type
High-power electric and electronic switch S4 and current-limiting reactor L1 branch；
Then the first full-control type high-power electric and electronic switch S3 is disconnected within the same time and the second full-control type is high-power
Electronic power switch S4, makes fault current forced branch to capacitive buffer branch, and buffer condenser C2 is started to charge；Due to first
Full-control type high-power electric and electronic switch S3 and the second full-control type high-power electric and electronic switch S4 equivalent capacity are much larger than first
The equivalent capacity at the both ends Fast mechanical switch S1, so that voltage almost acts on the first two sides Fast mechanical switch S1, the
One Fast mechanical switch S1, the first full-control type high-power electric and electronic switch S3 and the second full-control type high-power electric and electronic switch
S4 three's series voltage is equal with buffer condenser C2 both end voltage, and buffer condenser C2 starting voltage is close to zero, therefore
In first full-control type high-power electric and electronic switch S3 and the second full-control type high-power electric and electronic switch S4 disconnection process, almost
No-voltage effect, can reduce switch resistance to pressure request to full-control type high-power electric and electronic in this way；
When buffer condenser C2 both end voltage reaches arrester MOV operation voltage, the conducting of energy absorption branch, failure electricity
Stream is progressively smaller until to be zero, and fault current is removed.
Compared with prior art, the present invention has the advantage that are as follows:
Small, the unregulated power electronic device in specified through-flow branch, so not needing cooling system is lost in specified through-flow situation
System.To reduce the on-state loss in circuit while also avoid unnecessary waste of energy.
With buffer condenser instead of previous a large amount of electronic power switch series arms, can be greatly lowered hybrid straight
Flow the cost of breaker.It can be reduced in interrupting process simultaneously and the pressure resistance of full-control type power electronic switch in electric current transfer branch is wanted
It asks.
After the second Fast mechanical switch S2 is turned off, electric current shifts branch by electric current and circulates, and is first turned off first at this time
Fast mechanical switch S1, then simultaneously turn off the first full-control type high-power electric and electronic switch S3 and the second full-control type high-power electric
Electronic switch S4 makes electric current be fully transferred to capacitive buffer branch.Due to the first full-control type high-power electric and electronic switch S3 with
The equivalent capacity of second full-control type high-power electric and electronic switch S4 is much larger than the equivalent electricity at the first both ends Fast mechanical switch S1
Hold, voltage is made almost to act on the first two sides Fast mechanical switch S1, the first Fast mechanical switch S1, the big function of the first full-control type entirely
Rate electronic power switch S3 and the second full-control type high-power electric and electronic switch S4 three series voltage and buffer condenser C2 two
Hold voltage equal, buffer condenser C2 starting voltage is close to zero, therefore in the first full-control type high-power electric and electronic switch S3
With the second full-control type high-power electric and electronic switch S4 in disconnection process, almost no-voltage is acted on, and can be reduced in this way to full control
Type high-power electric and electronic switchs resistance to pressure request.Concatenated electronic power switch previous using buffer condenser C2 substitution simultaneously
Branch can reduce hybrid circuit breaker overall cost.
Detailed description of the invention
Fig. 1 is a kind of hybrid high voltage DC breaker circuit diagram of low-loss forced commutation type of the present invention.
Specific embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
As shown in Figure 1, electric current flows through the first Fast mechanical switch S1 and the second Quick mechanical is opened under accidental conditions
Close S2 branch, since mechanical switch On-resistance is small, thus the hybrid dc circuit breaker be lost under nominal operating conditions it is small.
When short trouble occurs for system, fault current is flowed into from end of incoming cables A1, at this time to the first Fast mechanical switch S1
Action command is issued with the second Fast mechanical switch S2, makes the touching of the first Fast mechanical switch S1 and the second Fast mechanical switch S2
Head separation, trigger current shifts the first full-control type high-power electric and electronic switch S3 and the second full-control type in branch at the same time
High-power electric and electronic switch S4 is turned it on, and pre-charge capacitor C1 passes through the second full-control type high-power electric and electronic respectively and opens
Close S4, current-limiting reactor L1, the second Fast mechanical switch S2 and the first full-control type high-power electric and electronic circuit switch S3 are the
Two Fast mechanical switch S2 provide reverse current, make the second Fast mechanical switch S2 under conditions of generating artificial zero crossing and by
It rapidly switches off；During this period due to branch and buffering capacitor where the first Fast mechanical switch S1 and the second Fast mechanical switch S2
Device C2 is in parallel, so that the second Fast mechanical switch S2 is acted under zero initial voltage conditions.
After the second Fast mechanical switch S2 is fully disconnected, electric current is transferred to electric current transfer branch completely, at this time electric current stream
Through the first Fast mechanical switch S1, the first full-control type high-power electric and electronic switch S3, pre-charge capacitor C1, the second full-control type
High-power electric and electronic switch S4 and current-limiting reactor L1 branch.
Then the first full-control type high-power electric and electronic switch S3 is disconnected within the same time and the second full-control type is high-power
Electronic power switch S4, makes fault current forced branch to capacitive buffer branch, and buffer condenser C2 is started to charge；Due to first
Full-control type high-power electric and electronic switch S3 and the second full-control type high-power electric and electronic switch S4 equivalent capacity are much larger than first
The equivalent capacity at the both ends Fast mechanical switch S1, so that voltage almost acts on the first two sides Fast mechanical switch S1, the
One Fast mechanical switch S1, the first full-control type high-power electric and electronic switch S3 and the second full-control type high-power electric and electronic switch
S4 three's series voltage is equal with buffer condenser C2 both end voltage, and buffer condenser C2 starting voltage is close to zero, therefore
In first full-control type high-power electric and electronic switch S3 and the second full-control type high-power electric and electronic switch S4 disconnection process, almost
No-voltage effect, can reduce switch resistance to pressure request to full-control type high-power electric and electronic in this way.
When buffer condenser C2 both end voltage reaches arrester MOV operation voltage, the conducting of energy absorption branch, failure electricity
Stream is progressively smaller until to be zero, and fault current is removed.
Claims (4)
1. a kind of hybrid high voltage DC breaker of low-loss forced commutation type is turned by loss-free specified through-flow branch, electric current
Move branch, capacitive buffer branch, energy absorption branch and end of incoming cables (A1) and leading-out terminal (A2) composition, it is characterised in that:
The specified through-flow branch routing the first Fast mechanical switch (S1) and the second Fast mechanical switch (S2) are in series, the
One end of one Fast mechanical switch (S1) is connected with end of incoming cables (A1), one end of the other end and the second Fast mechanical switch (S2)
It is connected；The other end of second Fast mechanical switch (S2) is connected with leading-out terminal (A2)；Due to mechanical switch conduction impedance
It is low, keep breaker conduction loss in nominal operation small；
Electric current transfer branch routing first diode (D1) and the second diode (D2), the first full-control type high-power electric electricity
Sub switch (S3) and the second full-control type high-power electric and electronic switch (S4) and pre-charge capacitor (C1) form；Described first
Diode (D1) anode switchs (S3) collector with the first full-control type high-power electric and electronic and is connected, first diode (D1) yin
Pole switchs (S4) collector with the second full-control type high-power electric and electronic and is connected；Second diode (D2) anode and the first full control
Type high-power electric and electronic switch (S3) emitter is connected, the second diode (D2) cathode and the second full-control type high-power electric
Electronic switch (S4) emitter is connected, and four are sequentially connected in series as primary Ioops；The pre-charge capacitor (C1), anode is even
It is connected between first diode (D1) cathode and the second full-control type high-power electric and electronic switch (S4) collector, cathode connection
Between the second diode (D2) anode and the first full-control type high-power electric and electronic switch (S3) emitter；
The electric current shifts branch, first diode (D1) anode and the first full-control type high-power electric and electronic switch (S3)
Connecting line and the second diode (D2) cathode and the second full-control type high-power electric and electronic switch (S4) hair between collector
Connecting line between emitter-base bandgap grading respectively with the first Fast mechanical switch (S1) in specified through-flow branch and Fast mechanical switch (S2) it
Between connecting line and one end of current-limiting reactor (L1) be connected, the wherein other end of current-limiting reactor (L1) and leading-out terminal (A2)
It is connected；
Capacitive buffer branch routing buffer condenser (C2) is constituted, buffer condenser one end (C2) and end of incoming cables (A1) phase
Even, the other end shifts the connecting line between branch and current-limiting reactor (L1) with electric current by third diode (D3) and is connected；
Wherein, third diode (D3) anode tap is connected with buffer condenser (C2), and third diode (D3) cathode terminal and electric current shift
Connecting line between branch and current-limiting reactor (L1) is connected；(D3 effect is to prevent pre-charge capacitor to third diode
(C1) to buffer condenser (C2) reverse charging；
Energy absorption branch routing arrester (MOV) composition, arrester (MOV) are parallel to the both ends buffer condenser (C2),
When buffering capacitor (C2) both end voltage reaches arrester (MOV) operation voltage, arrester (MOV) movement absorbs buffering capacitor
(C2) overvoltage that energy and limitation buffering capacitor (C2) are born.
2. the hybrid high voltage DC breaker of low-loss forced commutation type according to claim 1, it is characterised in that: described
First Fast mechanical switch (S1) is vacuum circuit breaker, gas circuit breaker or disconnecting switch；Second Fast mechanical switch (S2) is
Vacuum circuit breaker or gas circuit breaker etc..
3. the hybrid high voltage DC breaker of low-loss forced commutation type according to claim 1, it is characterised in that: described
First full-control type high-power electric and electronic switchs (S3) and the second full-control type high-power electric and electronic switch (S4) is IEGT, IGCT
Or IGBT；When normal running conditions, full-control type high-power electric and electronic switch is in an off state.
4. the working method of the described in any item hybrid high voltage DC breakers of low-loss forced commutation type of claims 1 to 3,
It is characterized by:
Under accidental conditions, electric current flows through the first Fast mechanical switch (S1) and the second Fast mechanical switch (S2) branch,
Since mechanical switch On-resistance is small, thus the hybrid high voltage DC breaker be lost under nominal operating conditions it is small；
When short trouble occurs for system, fault current is flowed into from end of incoming cables (A1), at this time to the first Fast mechanical switch (S1)
Action command is issued with the second Fast mechanical switch (S2), makes the first Fast mechanical switch (S1) and the second Fast mechanical switch
(S2) contact separation, at the same time trigger current transfer branch in the first full-control type high-power electric and electronic switch (S3) and
Second full-control type high-power electric and electronic switch (S4) turns it on, and pre-charge capacitor (C1) is big by the second full-control type respectively
Power power electronic switch (S4), current-limiting reactor (L1), the second Fast mechanical switch (S2) and the high-power electricity of the first full-control type
The power electronic switch circuit (S3) is that the second Fast mechanical switch (S2) provides reverse current, and the second Fast mechanical switch (S2) is made to exist
It generates under conditions of artificial zero crossing and is rapidly turned off；During this period quickly due to the first Fast mechanical switch (S1) and second
Branch where mechanical switch (S2) is in parallel with buffer condenser (C2), so that the second Fast mechanical switch (S2) is in zero initial voltage
Under the conditions of act；
After the second Fast mechanical switch (S2) is fully disconnected, electric current is transferred to electric current transfer branch completely, and electric current flows through at this time
First Fast mechanical switch (S1), the first full-control type high-power electric and electronic switch (S3), pre-charge capacitor (C1), second are entirely
Control type high-power electric and electronic switchs (S4) and current-limiting reactor (L1) branch；
Then the first full-control type high-power electric and electronic switch (S3) and the high-power electricity of the second full-control type are disconnected within the same time
Power electronic switch (S4), makes fault current forced branch to capacitive buffer branch, and buffer condenser (C2) starts to charge；Due to
One full-control type high-power electric and electronic switchs (S3) and the second full-control type high-power electric and electronic switch (S4) equivalent capacity is long-range
Equivalent capacity in the both ends the first Fast mechanical switch (S1), so that voltage almost acts on the first Fast mechanical switch
(S1) two sides, the first Fast mechanical switch (S1), the first full-control type high-power electric and electronic switch (S3) and the second full-control type are big
Power power electronic switch (S4) three series voltage is equal with buffer condenser (C2) both end voltage, and buffer condenser (C2) rises
Beginning voltage is close to zero, therefore in the first full-control type high-power electric and electronic switch (S3) and the second full-control type high-power electric electricity
In sub switch (S4) disconnection process, almost no-voltage is acted on, and can reduce switch pressure resistance to full-control type high-power electric and electronic in this way
It is required that；
When buffer condenser (C2) both end voltage reaches arrester (MOV) operation voltage, the conducting of energy absorption branch, failure electricity
Stream is progressively smaller until to be zero, and fault current is removed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810243933.1A CN108539717B (en) | 2018-03-23 | 2018-03-23 | A kind of hybrid high voltage DC breaker of low-loss forced commutation type and working method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810243933.1A CN108539717B (en) | 2018-03-23 | 2018-03-23 | A kind of hybrid high voltage DC breaker of low-loss forced commutation type and working method |
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| CN108539717B true CN108539717B (en) | 2019-08-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110739167B (en) * | 2019-05-10 | 2023-03-10 | 许继集团有限公司 | Direct current switch equipment |
| CN116054105A (en) * | 2023-02-28 | 2023-05-02 | 南京南瑞继保电气有限公司 | Current switching device, control method thereof and direct-current power transmission and distribution system |
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| JP2002093294A (en) * | 2000-09-18 | 2002-03-29 | Toshiba Corp | Vacuum dc breaker |
| CN206332441U (en) * | 2016-11-17 | 2017-07-14 | 全球能源互联网研究院 | A kind of circuit for being used to remove ac and dc systemses fault current |
| CN107086541A (en) * | 2017-06-05 | 2017-08-22 | 国家电网公司 | The hybrid circuit breaker and its cutoff method of a kind of two-way disjunction |
| CN107171278A (en) * | 2017-05-24 | 2017-09-15 | 国家电网公司 | A kind of no-voltage dc circuit breaker and input method for dividing |
| CN107453335A (en) * | 2016-05-30 | 2017-12-08 | 全球能源互联网研究院 | A kind of dc circuit breaker and its control method |
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2018
- 2018-03-23 CN CN201810243933.1A patent/CN108539717B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002093294A (en) * | 2000-09-18 | 2002-03-29 | Toshiba Corp | Vacuum dc breaker |
| CN107453335A (en) * | 2016-05-30 | 2017-12-08 | 全球能源互联网研究院 | A kind of dc circuit breaker and its control method |
| CN206332441U (en) * | 2016-11-17 | 2017-07-14 | 全球能源互联网研究院 | A kind of circuit for being used to remove ac and dc systemses fault current |
| CN107171278A (en) * | 2017-05-24 | 2017-09-15 | 国家电网公司 | A kind of no-voltage dc circuit breaker and input method for dividing |
| CN107086541A (en) * | 2017-06-05 | 2017-08-22 | 国家电网公司 | The hybrid circuit breaker and its cutoff method of a kind of two-way disjunction |
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