CN105811381B - A kind of direct current current-limiting circuit breaker - Google Patents
A kind of direct current current-limiting circuit breaker Download PDFInfo
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- CN105811381B CN105811381B CN201610152868.2A CN201610152868A CN105811381B CN 105811381 B CN105811381 B CN 105811381B CN 201610152868 A CN201610152868 A CN 201610152868A CN 105811381 B CN105811381 B CN 105811381B
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- 239000003990 capacitor Substances 0.000 claims abstract description 37
- 230000010355 oscillation Effects 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims description 11
- 230000005611 electricity Effects 0.000 claims description 10
- 230000001052 transient effect Effects 0.000 claims description 6
- 230000001939 inductive effect Effects 0.000 claims description 3
- 230000003534 oscillatory effect Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
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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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- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
A kind of direct current current-limiting circuit breaker, including current limiter (23), mechanical chopper (24), transverter (21), line short impedance (22), load (28) and A cross streams power supply (25), B cross streams power supply (26) and C cross streams power supply (27).Described line short impedance (22), current limiter (23), mechanical chopper (24) and load (28) is sequentially connected in series.Discharged by the cooperation of current limiter and capacitor, in the case of without additional oscillation circuit and energy-absorbing loop, realize that fast-speed direct current fault current of the mechanical chopper under direct current operating mode disconnects.
Description
Technical field
The present invention relates to a kind of direct current current-limiting circuit breaker, the HVDC limit of more particularly to a kind of flexible direct current power transmission system
Flow breaker.
Background technology
With the exploitation and application of the new energy such as wind-powered electricity generation, solar energy, the multiterminal flexible direct current based on voltage source converter
Technology of transmission of electricity (MTDC), more and more important position is occupied in direct current transportation field.The new energy such as wind energy, solar power generation access
The biggest obstacle of power network is that it is intermittent and uncertain, and Technology of HVDC based Voltage Source Converter can efficiently control electric energy, isolation
The diffusion of electric network fault, and can also according to power network demand, it is quick, flexibly, adjustably send or absorb part energy, from
And optimize trend distribution, enhancing grid stability, the intellectuality for lifting power network and the controllability of power network.
Once short trouble occurs on MTDC DC side circuit, the electric capacity equivalent to Converter DC-side directly discharges,
Its short circuit current can be in several milliseconds to peaking, and maximum typically has several kilo-amperes to tens kilo-amperes.Larger current-rising-rate
The problems such as heat concentration, arc spark, electromagnetic stress will be brought, meanwhile, because transverter typically uses IGBT or IGCT, its is anti-
Parallel diode can form uncontrollable rectifier bridge, so control transverter can not disengagement failure electric current, short circuit current or even meeting merely
Damage current conversion station.Direct-current short circuit electric current does not have zero crossing, and its peak value and climbing speed will be significantly larger than AC network, because
This, disconnects to direct-current short circuit failure and proposes higher requirement.
Cut-offfing for fault current is also restricted by the technology development such as dc circuit breaker.Document " send out by dc circuit breaker technology
Exhibition summary " (south electric network technology, 02 phase in 2015) is realized to mechanical chopper increase antiresonant circuit and energy-absorbing branch road, real
Existing direct current cut-offs.But exist cut-off with the quenching time it is longer the problem of.If using the side being pre-charged to antiresonant circuit
Formula improves the arc extinguishing speed of breaker, not only realizes that difficulty is big, and cut-off speed and be also difficult to meet the needs of direct current network.
Institute of State Grid Intelligent Electric Grids show that high voltage DC breaker needs disjunction by taking the simulation result of the end DC network of Zhoushan five as an example
15KA electric current (flexible DC power transmission net novel high-pressure dc circuit breaker design, Automation of Electric Systems, 2013,37
(15):95-102.), ABB is in the 320KV/2KA completed in 2012 mixed type high voltage DC breaker (The Hybrid
HVDC Breaker An innovation breakthrough enabling reliable HVDC grids.ABB Grid
Systems, Technical Paper Nov ' 2012), can disjunction 9KA fault current, but do not put into business because cost is too high
With, and increase Breaking capacity and can only rely on the connection in series-parallel of more IGBT units, this can increase considerably breaker cost, reduce
Reliability.In a word, short-circuit current, which cut-offs problem, turns into a bottleneck of flexible DC power transmission net development.
The content of the invention
In order to overcome the shortcomings of prior art, the present invention proposes that a kind of direct current current-limiting for flexible direct current power transmission system breaks
Road device, it is simple in construction, cost is low, can effectively limit direct current network fault current.
The technical solution adopted by the present invention is：
The present invention is the direct current current-limiting circuit breaker for flexible direct current power transmission system.The direct current current-limiting circuit breaker includes current limliting
Device, mechanical chopper, transverter, line short impedance, load, A cross streams power supply, B cross streams power supply and C cross streams power supplys.
Described line short impedance, current limiter, mechanical chopper and load is sequentially connected in series, and is connected to the first of transverter
Between output end and the second output end.One end of one end of A cross streams power supplys, one end of B cross streams power supplys and C cross streams power supplys
Parallel connection, the other end of A cross streams power supplys and the first input end of transverter, B cross streams power supplys the other end and with transverter
Second input is connected, and the other end of C cross streams power supplys is connected with the 3rd input of transverter.
Described transverter is opened by the first IGBT switching tubes, the 2nd IGBT switching tubes, the 3rd IGBT switching tubes, the 4th IGBT
Guan Guan, the 5th IGBT switching tubes, the 6th IGBT switching tubes and capacitor bank into.First IGBT switching tubes and the 2nd IGBT switching tubes
Series connection, the 3rd IGBT switching tubes and the series connection of the 4th IGBT switching tubes, the 5th IGBT switching tubes and the series connection of the 6th IGBT switching tubes, three
Individual series arm composes in parallel transverter with capacitor.Wherein, one end of the first IGBT switching tubes and the 2nd IGBT switching tubes
One end is connected with the 3rd input；One end of 3rd IGBT switching tubes and one end of the 4th IGBT switching tubes and the second input phase
Even；One end of 5th IGBT switching tubes and one end of the 6th IGBT switching tubes are connected with first input end；First IGBT switching tubes
The other end, the other end of the 3rd IGBT switching tubes and the other end of the 5th IGBT switching tubes be connected with the first output end；Second
The other end and the second output end of the other end of IGBT switching tubes, the other end of the 4th IGBT switching tubes and the 6th IGBT switching tubes
It is connected；Capacitor is connected between the first output end and the second output end.
Described line short impedance is made up of short-circuit resistance and short circuited inductance, short-circuit resistance and short circuited inductance series connection, even
It is connected between the first tie point and the second tie point.
Described current limiter is inductive type current limiter, or resistance-type current restrictor, or hybrid circuit current limiter.Its equivalent electric
Current-limiting resistance and current-limiting inductance composition, current-limiting resistance and current-limiting inductance series connection are route, is connected to the second tie point and the 3rd connection
Between point.Wherein, in Power System Steady-state, current-limiting resistance is approximately zero resistance, and power network is not had an impact.
During Power System Steady-state, mechanical chopper is in closure state, the first IGBT switching tubes, the 2nd IGBT switches of transverter
Pipe, the 3rd IGBT switching tubes, the 4th IGBT switching tubes, the 5th IGBT switching tubes and the 6th IGBT switching tubes are controlled and be on
State, it is pre-charged to capacitor.DC current is turned on by line short impedance, current limiter, mechanical chopper and load.Limit
Stream device is in zero resistance state, and circuit is not had an impact.
When short trouble occurs for power network, power network current increases rapidly, when the electric current for detecting power network line short-circuit impedance surpasses
When crossing threshold value, the first IGBT switching tubes, the 2nd IGBT switching tubes, the 3rd IGBT switching tubes, the 4th IGBT switching tubes, the 5th IGBT
Switching tube, the 6th IGBT switching tubes and mechanical chopper controlled shutdown.Before mechanical chopper is fully disconnected, by capacitor,
Short-circuit resistance, short circuited inductance, current-limiting resistance and current-limiting inductance are by mechanical chopper composition oscillation circuit, to capacitor discharge.
When oscillatory process is underdamped oscillation, during oscillating current zero passage, that is, meets the cut-offfing condition of mechanical chopper and complete failure
Electric current cut-offs.Discharged by the cooperation of current limiter and capacitor, in the case of without additional oscillation circuit and energy-absorbing loop,
Fast-speed direct current fault current of the mechanical chopper under direct current operating mode is realized to disconnect.
Direct current current-limiting circuit breaker Parameters design of the present invention is as follows：
Capacitor discharge procedural representation is：
For underdamped oscillation, the condition of satisfaction：
Discharge process is in underdamped oscillation process, can be obtained by formula (1)：
In formula,
In formula, ω0For the first resonance angular frequency, ω1For the second angular frequency, β1For starting phase angle；δ1It is normal for the intrinsic time
Number；
According to underdamped oscillation feature, in tm1=β1/ω1When, DC line electric current reaches maximum：
In formula, Ipm1For DC line current maxima；tm1For the maximum current moment；
According to underdamped oscillation feature, in tm2=π/ω1When, DC line electric current is zero, for by mechanical chopper
Disconnection creates condition.In the case of without additional oscillation circuit and energy-absorbing loop, mechanical chopper is realized in direct current work
Quick disconnection under condition.That is current over-zero moment tm2It is expressed as：
Wherein：tm2For the current over-zero moment, C is the electric capacity of capacitor, and L is the inductance of short circuited inductance, and R is short-circuit resistance electricity
Resistance, LfFor current-limiting inductance inductance, RfFor current-limiting resistance resistance, U0For the pre-charge voltage of capacitor, udcFor the transient state electricity of capacitor
Pressure, I0For the steady state run current of short circuited inductance；I is the transient voltage of short circuited inductance.
Discharged by the cooperation of current limiter and capacitor, it is real in the case of without additional oscillation circuit and energy-absorbing loop
Show fast-speed direct current fault current of the mechanical chopper under direct current operating mode to disconnect.
Main advantages of the present invention：
1. the present invention is engaged by direct current limiter with mechanical chopper, realize to the straight of flexible direct current power transmission system
Flow the effective limitation and disconnection of side short-circuit current；
2. the present invention forms resonance by the capacitor of current limiter and transverter, and resonance is realized under underdamping state
DC side fault current quick zero passage, so as to disconnect fault current by mechanical chopper；
3. the direct current that the present invention is engaged by direct current limiter with mechanical chopper cut-offs technology, reduce mechanical open circuit
The shunt-resonant circuit of device and energy-absorbing circuit, reduce breaker cost, improve the connecting-disconnecting function of breaker.
Brief description of the drawings
Fig. 1 is the schematic diagram of the specific embodiment of the invention 1；
Fig. 2 is the equivalent circuit schematic of the specific embodiment of the invention 1；
Fig. 3 is the oscillating current voltage waveform of the specific embodiment of the invention 1.
Embodiment
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings：
The specific embodiment 1 that Fig. 1 show the present invention is the direct current current-limiting circuit breaker for flexible direct current power transmission system.Should
Direct current current-limiting circuit breaker intersects including current limiter 23, mechanical chopper 24, transverter 21, line short impedance 22, load 28, A
Flow power supply 25, B cross streams power supply 26 and C cross streams power supply 27.
Described line short impedance 22, current limiter 23, mechanical chopper 24 and load 28 is sequentially connected in series, and is connected to the change of current
Between the first output end 4 and the second output end 8 of device 21.A cross streams power supply 25, B cross streams power supply 26 and C cross streams power supply 27
One end it is in parallel, the other end of A cross streams power supply 25, B cross streams power supply 26 and C cross streams power supply 27 respectively with transverter 21
First input end 1, the second input 2 are connected with the 3rd input 3, form direct current current-limiting circuit breaker.
Fig. 2 show the equivalent circuit schematic of the specific embodiment of the invention 1.
Described transverter 21 is by the first IGBT switching tubes 31, the 2nd IGBT switching tubes 32, the 3rd IGBT switching tubes 33,
Four IGBT switching tubes 34, the 5th IGBT switching tubes 35, the 6th IGBT switching tubes 36 and capacitor 37 form.First IGBT switching tubes
31 and the 2nd IGBT switching tubes 32 connect, the 3rd IGBT switching tubes 33 and the 4th IGBT switching tubes 34 are connected, the 5th IGBT switches
The IGBT switching tubes 36 of pipe 35 and the 6th are connected, and three series arms compose in parallel transverter 21 with capacitor 37.Wherein, first
One end of IGBT switching tubes 31 and one end of the 2nd IGBT switching tubes 32 are connected with the 3rd input 3；3rd IGBT switching tubes 33
One end and one end 34 of the 4th IGBT switching tubes be connected with the second input 2；One end and the 6th of 5th IGBT switching tubes 35
One end of IGBT switching tubes 36 is connected with first input end 1；The other end, the 3rd IGBT switching tubes 33 of first IGBT switching tubes 31
The other end and the other ends of the 5th IGBT switching tubes 35 be connected with the first output end 4；The other end of 2nd IGBT switching tubes 32,
The other end of 4th IGBT switching tubes 34 and the other end of the 6th IGBT switching tubes 36 are connected with the second output end 8；Capacitor 37
It is connected between the first output end 4 and the second output end 8.
Described line short impedance 22 is made up of short-circuit resistance 41 and short circuited inductance 42, short-circuit resistance 41 and short circuited inductance
42 series connection, are connected between the first tie point 4 and the second tie point 5.
Described current limiter 23 is inductive type current limiter, or resistance-type current restrictor, or hybrid circuit current limiter.Its is equivalent
Circuit is made up of current-limiting resistance 51 and current-limiting inductance 52, and current-limiting resistance 51 and current-limiting inductance 52 are connected, and is connected to the second tie point 5
And the 3rd between tie point 6.Wherein, in Power System Steady-state, current-limiting resistance 51 is approximately zero resistance, and power network is not had an impact.
During Power System Steady-state, mechanical chopper 24 is in closure state, the first IGBT switching tubes 31, second of transverter 21
IGBT switching tubes 32, the 3rd IGBT switching tubes 33, the 4th IGBT switching tubes 34, the 5th IGBT switching tubes 35 and the 6th IGBT switches
Pipe 36 is controlled and in the conduction state, is pre-charged to capacitor 37.DC current by line short impedance 22, current limiter 23,
Mechanical chopper 24 turns on loading 28.Current limiter 23 is in zero resistance state, and circuit is not had an impact.
When short trouble occurs for power network, power network current increases rapidly, when the electric current for detecting power network line short-circuit impedance 22
During more than threshold value, the first IGBT switching tubes 31, the 2nd IGBT switching tubes 32, the 3rd IGBT switching tubes 33, the 4th IGBT switching tubes
34th, the 5th IGBT switching tubes 35, the 6th IGBT switching tubes 36 and the controlled shutdown of mechanical chopper 24.It is complete in mechanical chopper 24
Before disconnection, by capacitor 37, short-circuit resistance 41, short circuited inductance 42, current-limiting resistance 51 and current-limiting inductance 52 by machinery open circuit
Device 24 and form oscillation circuit, capacitor 37 is discharged.When oscillatory process is underdamped oscillation, during oscillating current zero passage, i.e.,
Meet mechanical chopper 24 cut-offs condition, completes cut-offfing for fault current.Discharged by the cooperation of current limiter and capacitor,
In the case of without additional oscillation circuit and energy-absorbing loop, fast-speed direct current failure of the mechanical chopper under direct current operating mode is realized
Electric current disconnects.
Described direct current current-limiting circuit breaker Parameters design is as follows：
The discharge process of capacitor 37 is expressed as：
For underdamped oscillation, the condition of satisfaction：
Discharge process is in underdamped oscillation process, can be obtained by formula (1)：
In formula,
In formula, ω0For the first resonance angular frequency, ω1For the second angular frequency, β1For starting phase angle, δ1It is normal for the intrinsic time
Number；
According to underdamped oscillation feature, in tm1=β1/ω1When, DC line electric current reaches maximum：
In formula, Ipm1For DC line current maxima, tm1For the maximum current moment；
According to underdamped oscillation feature, in tm2=π/ω1When, DC line electric current is zero, to pass through mechanical chopper 24
Disconnection create condition.In the case of without additional oscillation circuit and energy-absorbing loop, mechanical chopper is realized in direct current
Quick disconnection under operating mode.That is current over-zero moment tm2It is expressed as：
Wherein：tm2For the current over-zero moment, C is the electric capacity of capacitor 37, and L is the inductance of short circuited inductance 42, and R is short circuit electricity
Hinder 41 resistance, LfFor the inductance of current-limiting inductance 52, RfFor the resistance of current-limiting resistance 51, U0For the pre-charge voltage of capacitor 37, udcFor electricity
The transient voltage of container 37, I0For the steady state run current of short circuited inductance 42；I is the transient voltage of short circuited inductance 42.
Discharged by the cooperation of current limiter and capacitor, it is real in the case of without additional oscillation circuit and energy-absorbing loop
Show fast-speed direct current fault current of the mechanical chopper under direct current operating mode to disconnect.
Fig. 3 show oscillating current voltage waveform.Current be DC line short circuit current, Voltage of Cap
For condenser voltage, Voltage of FCL are current limiter voltage.In flexible direct current power transmission system, DC voltage ± 200kV,
DC rated current 2kA, electric capacity 1.6mF, short circuited inductance and resistance are 0.01 Ω and 0.1mH, the Ω of current-limiting resistance 4, current-limiting reactor
Under 26mH, fault current is restricted to 51kA, limitation rate 75.9%, time current crosses zero 25ms by 212kA.Also, according to
The fault characteristic and impedance conditions of flexible direct current power transmission system, the parameter of current limiter and breaker is further adjusted, can be reached
More preferable current limitation effect.
Claims (3)
1. a kind of direct current current-limiting circuit breaker, it is characterized in that：Described direct current current-limiting circuit breaker includes current limiter (23), machinery open circuit
Device (24), transverter (21), line short impedance (22), load (28) and A cross streams power supply (25), B cross streams power supply (26)
With C cross streams power supply (27)；Line short impedance (22), current limiter (23), mechanical chopper (24) and load (28) are gone here and there successively
Connection, is connected between the output end (4) of transverter (21) first and the second output end (8)；A cross streams power supply (25), B cross streams electricity
Source (26) and one end of C cross streams power supply (27) are in parallel, A cross streams power supply (25), B cross streams power supply (26) and C cross streams electricity
The other end in source (27) first input end (1) with transverter (21), the second input (2) and the 3rd input (3) phase respectively
Even, direct current current-limiting circuit breaker is formed；
Described transverter (21) is by the first IGBT switching tubes (31), the 2nd IGBT switching tubes (32), the 3rd IGBT switching tubes
(33), the 4th IGBT switching tubes (34), the 5th IGBT switching tubes (35), the 6th IGBT switching tubes (36) and capacitor (37) group
Into；First IGBT switching tubes (31) and the 2nd IGBT switching tubes (32) series connection, the 3rd IGBT switching tubes (33) and the 4th IGBT are opened
Close pipe (34) series connection, the 5th IGBT switching tubes (35) and the series connection of the 6th IGBT switching tubes (36), three series arms and capacitor
(37) transverter (21) is composed in parallel；Wherein, one end of the first IGBT switching tubes (31) and the 2nd IGBT switching tubes (32) one end
It is connected with the 3rd input (3)；One end of 3rd IGBT switching tubes (33) and one end and second of the 4th IGBT switching tubes (34)
Input (2) is connected；One end of 5th IGBT switching tubes (35) and one end and the first input end of the 6th IGBT switching tubes (36)
(1) it is connected；The other end, the other end and the 5th IGBT switching tubes of the 3rd IGBT switching tubes (33) of first IGBT switching tubes (31)
(35) the other end is connected with the first output end (4)；The other end, the 4th IGBT switching tubes (34) of 2nd IGBT switching tubes (32)
The other end and the other ends of the 6th IGBT switching tubes (36) be connected with the second output end (8)；Capacitor (37) is connected to first
Between output end (4) and the second output end (8)；
Described line short impedance (22) is made up of short-circuit resistance (41) and short circuited inductance (42), short-circuit resistance (41) and short circuit
Inductance (42) is connected, and is connected between the first tie point (4) and the second tie point (5)；
The Parameters design of described direct current current-limiting circuit breaker is as follows；
Capacitor (37) discharge process is expressed as：
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<mi>f</mi>
</msub>
</mrow>
<mrow>
<mn>2</mn>
<mrow>
<mo>(</mo>
<mi>L</mi>
<mo>+</mo>
<msub>
<mi>L</mi>
<mi>f</mi>
</msub>
<mo>)</mo>
</mrow>
</mrow>
</mfrac>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
</mrow>
</msqrt>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<msub>
<mi>&delta;</mi>
<mn>1</mn>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<mi>R</mi>
<mo>+</mo>
<msub>
<mi>R</mi>
<mi>f</mi>
</msub>
</mrow>
<mrow>
<mn>2</mn>
<mrow>
<mo>(</mo>
<mi>L</mi>
<mo>+</mo>
<msub>
<mi>L</mi>
<mi>f</mi>
</msub>
<mo>)</mo>
</mrow>
</mrow>
</mfrac>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<msub>
<mi>&omega;</mi>
<mn>0</mn>
</msub>
<mo>=</mo>
<msqrt>
<mrow>
<msup>
<msub>
<mi>&delta;</mi>
<mn>1</mn>
</msub>
<mn>2</mn>
</msup>
<mo>+</mo>
<msup>
<msub>
<mi>&omega;</mi>
<mn>1</mn>
</msub>
<mn>2</mn>
</msup>
</mrow>
</msqrt>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<msub>
<mi>&beta;</mi>
<mn>1</mn>
</msub>
<mo>=</mo>
<msub>
<mi>arctan&omega;</mi>
<mn>1</mn>
</msub>
<mo>/</mo>
<msub>
<mi>&delta;</mi>
<mn>1</mn>
</msub>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>4</mn>
<mo>)</mo>
</mrow>
</mrow>
In formula, ω0For the first resonance angular frequency, ω1For the second angular frequency, β1For starting phase angle, δ1For intrinsic time constant；
According to underdamped oscillation feature, in tm1=β1/ω1When, DC line electric current Ipm1Reach maximum：
<mrow>
<msub>
<mi>I</mi>
<mrow>
<mi>p</mi>
<mi>m</mi>
<mn>1</mn>
</mrow>
</msub>
<mo>=</mo>
<mfrac>
<msub>
<mi>U</mi>
<mn>0</mn>
</msub>
<mrow>
<msub>
<mi>&omega;</mi>
<mn>1</mn>
</msub>
<mrow>
<mo>(</mo>
<mi>L</mi>
<mo>+</mo>
<msub>
<mi>L</mi>
<mi>f</mi>
</msub>
<mo>)</mo>
</mrow>
</mrow>
</mfrac>
<msup>
<mi>e</mi>
<mrow>
<mo>-</mo>
<msub>
<mi>&delta;</mi>
<mn>1</mn>
</msub>
<msub>
<mi>t</mi>
<mrow>
<mi>m</mi>
<mn>1</mn>
</mrow>
</msub>
</mrow>
</msup>
<msub>
<mi>sin&beta;</mi>
<mn>1</mn>
</msub>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>5</mn>
<mo>)</mo>
</mrow>
</mrow>
In formula, Ipm1For DC line current maxima；tm1For the maximum current moment；
According to underdamped oscillation feature, in tm2=π/ω1When, DC line electric current is zero, for by mechanical chopper (24)
Disconnection creates condition；In the case of without additional oscillation circuit and energy-absorbing loop, mechanical chopper is realized in direct current work
Quick disconnection under condition；That is current over-zero moment tm2It is expressed as：
<mrow>
<msub>
<mi>t</mi>
<mrow>
<mi>m</mi>
<mn>2</mn>
</mrow>
</msub>
<mo>=</mo>
<mi>&pi;</mi>
<mo>/</mo>
<msqrt>
<mrow>
<mfrac>
<mn>1</mn>
<mrow>
<mo>(</mo>
<mi>L</mi>
<mo>+</mo>
<msub>
<mi>L</mi>
<mi>f</mi>
</msub>
<mo>)</mo>
<mi>C</mi>
</mrow>
</mfrac>
<mo>-</mo>
<msup>
<mrow>
<mo>(</mo>
<mfrac>
<mrow>
<mi>R</mi>
<mo>+</mo>
<msub>
<mi>R</mi>
<mi>f</mi>
</msub>
</mrow>
<mrow>
<mn>2</mn>
<mrow>
<mo>(</mo>
<mi>L</mi>
<mo>+</mo>
<msub>
<mi>L</mi>
<mi>f</mi>
</msub>
<mo>)</mo>
</mrow>
</mrow>
</mfrac>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
</mrow>
</msqrt>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>6</mn>
<mo>)</mo>
</mrow>
</mrow>
Wherein：tm2For the current over-zero moment, C is the electric capacity of capacitor (37), and L is the inductance of short circuited inductance (42), and R is short circuit electricity
Hinder (41) resistance, LfFor current-limiting inductance (52) inductance, RfFor current-limiting resistance (51) resistance, U0For the precharge electricity of capacitor (37)
Pressure, udcFor the transient voltage of capacitor (37), I0For the steady state run current of short circuited inductance (42)；I is short circuited inductance (42)
Transient voltage；
Discharged by the cooperation of current limiter and capacitor, in the case of without additional oscillation circuit and energy-absorbing loop, realize machine
Fast-speed direct current fault current of the tool breaker under direct current operating mode disconnects.
2. according to the direct current current-limiting circuit breaker described in claim 1, it is characterised in that：Described current limiter (23) is inductive type limit
Flow device, or resistance-type current restrictor, or hybrid circuit current limiter；Its equivalent circuit is by current-limiting resistance (51) and current-limiting inductance (52)
Composition, current-limiting resistance (51) and current-limiting inductance (52) series connection, are connected between the second tie point (5) and the 3rd tie point (6).
3. according to the direct current current-limiting circuit breaker described in claim 1, it is characterised in that：During Power System Steady-state, mechanical chopper (24)
In closure state, the first IGBT switching tubes (31), the 2nd IGBT switching tubes (32), the 3rd IGBT switching tubes of transverter (21)
(33), the 4th IGBT switching tubes (34), the 5th IGBT switching tubes (35) and the 6th IGBT switching tubes (36) are controlled and be on
State, it is pre-charged to capacitor (37)；DC current passes through line short impedance (22), current limiter (23), mechanical chopper
(24) and (28) is loaded and are turned on；Current limiter (23) is in zero resistance state, and circuit is not had an impact；
When short trouble occurs for power network, power network current increases rapidly, when the electric current for detecting power network line short-circuit impedance (22) surpasses
When crossing threshold value, the first IGBT switching tubes (31), the 2nd IGBT switching tubes (32), the 3rd IGBT switching tubes (33), the 4th IGBT are opened
Close pipe (34), the 5th IGBT switching tubes (35), the 6th IGBT switching tubes (36) and mechanical chopper (24) controlled shutdown；In machinery
Before breaker (24) disconnects, by capacitor (37), short-circuit resistance (41), short circuited inductance (42), current-limiting resistance (51) and current limliting
Inductance (52) discharges capacitor (37) by mechanical chopper (24) composition oscillation circuit；When oscillatory process is shaken for underdamping
When swinging, during oscillating current zero passage, that is, meet cut-offfing condition and completing cut-offfing for fault current for mechanical chopper (24)；Pass through limit
The cooperation for flowing device and capacitor is discharged, and in the case of without additional oscillation circuit and energy-absorbing loop, realizes that mechanical chopper exists
Fast-speed direct current fault current under direct current operating mode disconnects.
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| CN109921396B (en) * | 2019-04-23 | 2021-03-30 | 国网江苏省电力有限公司 | Protection device and protection method for direct-current power distribution network |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103296636A (en) * | 2013-05-24 | 2013-09-11 | 西安交通大学 | High-voltage direct-current gas breaker based on self-excited oscillation circuit |
| CN103632895A (en) * | 2013-12-04 | 2014-03-12 | 中国科学院电工研究所 | Direct-current circuit breaker |
| KR20150046529A (en) * | 2013-10-22 | 2015-04-30 | 명지대학교 산학협력단 | New circuit configuration of high-voltage hybrid dc circuit breaker |
| CN104620345A (en) * | 2012-08-27 | 2015-05-13 | Abb技术有限公司 | Apparatus arranged to break an electrical current |
| WO2015121983A1 (en) * | 2014-02-14 | 2015-08-20 | 三菱電機株式会社 | Protection system for dc power transmission system, ac/dc converter, and dc power transmission system breaking method |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104620345A (en) * | 2012-08-27 | 2015-05-13 | Abb技术有限公司 | Apparatus arranged to break an electrical current |
| CN103296636A (en) * | 2013-05-24 | 2013-09-11 | 西安交通大学 | High-voltage direct-current gas breaker based on self-excited oscillation circuit |
| KR20150046529A (en) * | 2013-10-22 | 2015-04-30 | 명지대학교 산학협력단 | New circuit configuration of high-voltage hybrid dc circuit breaker |
| CN103632895A (en) * | 2013-12-04 | 2014-03-12 | 中国科学院电工研究所 | Direct-current circuit breaker |
| WO2015121983A1 (en) * | 2014-02-14 | 2015-08-20 | 三菱電機株式会社 | Protection system for dc power transmission system, ac/dc converter, and dc power transmission system breaking method |
Non-Patent Citations (1)
| Title |
|---|
| 多端柔性直流电网故障隔离技术研究;李斌等;《中国电机工程学报》;20160105;第26卷(第1期);第87-93页 * |
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