CN107516876A - A kind of direct current interruption device applied to flexible DC power transmission - Google Patents
A kind of direct current interruption device applied to flexible DC power transmission Download PDFInfo
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- CN107516876A CN107516876A CN201710665510.4A CN201710665510A CN107516876A CN 107516876 A CN107516876 A CN 107516876A CN 201710665510 A CN201710665510 A CN 201710665510A CN 107516876 A CN107516876 A CN 107516876A
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- inductance
- distribution net
- electric capacity
- power switch
- direct current
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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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- 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
- H02H7/261—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 involving signal transmission between at least two stations
- H02H7/262—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 involving signal transmission between at least two stations involving transmissions of switching or blocking orders
Abstract
The present embodiments relate to power electronics and power transmission technology field, discloses a kind of direct current interruption device applied to flexible DC power transmission.The direct current interruption device for being applied to flexible DC power transmission includes：Power switch, control unit and disjunction auxiliary unit；The first end of power switch is used for the input side for connecting DC distribution net, the second end connection disjunction auxiliary unit of power switch, the output end of the control terminal connection control unit of power switch；Disjunction auxiliary unit is additionally operable to connect the input negative terminal of DC distribution net, output plus terminal and output negative terminal, and for producing current zero-crossing point in DC distribution net outlet side rear end short trouble so that control unit rupturing duty switchs；Control unit is used for the rupturing duty when detecting DC distribution net rear end failure and switched.Embodiment of the present invention actively creates current zero-crossing point when can be broken down in DC distribution net rear end, so as to directly be cut off when detecting failure, and then can improve breaking speed.
Description
Technical field
It is more particularly to a kind of to be applied to flexible direct current the present embodiments relate to power electronics and power transmission technology field
The direct current interruption device of transmission of electricity.
Background technology
In recent years, HVDC Transmission Technology has obtained swift and violent development.It is based particularly on modularization multi-level converter
The HVDC Transmission Technology of (Modular Multilevel Converter, MMC), it has reactive power, active power independent
Controllable, without filter and reactive power compensator, polarity of voltage the advantages that not changing, obtained extensive pass when trend inverts
Note and application.Wherein, D.C. high voltage transmission (High-Voltage Direct Current, HVDC), be mainly used in it is high-power,
Long distance powedr transmission；Mesolow HVDC Transmission Technology (Middle-Voltage Direct Current, MVDC and Low-
Voltage Direct Current, LVDC) then paid close attention in direct-current grid, ship power distribution net etc..
Dc circuit breaker is one of nucleus equipment for building direct current transportation network.Be different from ac transmission, direct current transportation by
In no current zero-crossing point, and line impedance is lower, and compared with AC circuit breaker, dc circuit breaker is in terms of arc extinguishing ability, control
All there is higher design difficulty in terms of protection speed.
Existing dc circuit breaker can be divided into following three kinds by type, be " mechanical disconnected based on ordinary tap respectively
Road device ", " solid circuit breaker " based on pure power electronic devices and " hybrid circuit breaker " based on the two combination.Wherein, machine
Tool formula breaker is limited by service life, breaking speed, and performance is minimum, and use occasion is minimum.Solid circuit breaker is with mixing
The difference of formula breaker is：Solid circuit breaker creates current zero-crossing point by power electronic devices, and is opened by power electronics
Device breaking current is closed, shortcoming is that switching device has on-state loss, it is difficult to for D.C. high voltage transmission.And hybrid circuit breaker
It is then to create current zero-crossing point, and cooperative mechanical formula switch breaking current, or mechanical breaking current by power electronic devices
When first do not consider current over-zero, then fast arc extinction is carried out to mechanical switch by power electronic devices circuit.
The workflow of above-mentioned Traditional DC breaker can be divided into two kinds, one is：A. failure is detected, B. creates electricity
Flow through zero point, C. disjunction transmission lines of electricity.The first workflow is commonly available to solid state, hybrid circuit breaker；The second is：A.
Failure is detected, disjunction transmission line of electricity, C. arc extinguishings, second of workflow are commonly available to mechanical, hybrid disconnected B. by force
Road device.
Analyzed from breaking speed, the first disjunction mode breaker needs 2 steps of order execution (to detect before disjunction
To failure and create current zero-crossing point), and second of disjunction mode breaker only needs 1 step of execution (to examine before disjunction
Measure failure).But due to the second class breaker includes mechanical structure, break may be slower than the first disjunction mode on the contrary
In solid state breaker.
Inventor has found that at least there are the following problems in the prior art：Wherein, one of prior art discloses a kind of resonance
The solid-state direct-current breaker of type, the major loop break-make of 1 thyristor switch control circuit, subsidiary loop then contain 2
Inductance, 1 electric capacity, 4 IGCTs and 1 diode.After detecting a failure, the control to IGCT in subsidiary loop is passed through
System, LC resonance is produced, manufacture main circuit current zero crossing.The shortcomings that this kind of scheme is to produce current zero-crossing point by controlling
The hardware configuration that speed is slow and control unit grades is complicated.The two of prior art disclose a kind of mixed type dc circuit breaker structure.
Major loop uses circuit of mechanical switch control break-make, and auxiliary extinction of arc loop then contains 2 road Absorption Capacitance series switching devices, profit
Reach the purpose of arc extinguishing with capacitive absorption surge current.Electric current is not zero when the shortcomings that this kind of scheme is disjunction, at mechanical switch
Electric arc is produced, easy to aging, maintenance cost is high, and has very high requirement for high speed machine switch.Three disclosures of prior art
A kind of all solid state dc circuit breaker of DC distribution net, it is all solid state formula breaker, without mechanical devices, shortcoming is breaker
Operating current is needed by 4 electronic power switch devices during normal work, and on-state voltage drop is big, has certain want for radiating
Ask.The four of prior art disclose a kind of solid-state direct-current breaker and its control method based on SiC MOSFET, it makes use of
Third generation semi-conducting material sic filed effect pipe, and make use of capacitive coupling to drive metal-oxide-semiconductor, metal-oxide-semiconductor is no longer needed
Want traditional RCD buffer circuits to realize to press.The shortcomings that this kind of scheme is equally that component is excessive, causes reliability decrease.
The content of the invention
The purpose of embodiment of the present invention is to provide a kind of direct current interruption device applied to flexible DC power transmission, and it can
Actively to create current zero-crossing point when DC distribution net outlet side rear end is broken down, so as to straight when detecting failure
Cut-out is connect, and then breaking speed can be improved.
In order to solve the above technical problems, embodiments of the present invention provide a kind of direct current applied to flexible DC power transmission
Tripper, including：Power switch, control unit and disjunction auxiliary unit；The first end of the power switch is used to connect
The input side of the DC distribution net, the second end of the power switch connect the disjunction auxiliary unit, the power switch
Control terminal connection described control unit output end；The disjunction auxiliary unit is additionally operable to connect the defeated of the DC distribution net
Enter negative terminal, output plus terminal and output negative terminal, and for producing electric current mistake during terminal shortcircuit after the DC distribution net outlet side
Zero point cuts off the power switch so as to described control unit；Described control unit is used to detect that the DC distribution net is defeated
The power switch is cut off when going out side rear end short trouble.
Embodiment of the present invention is connected on the defeated of DC distribution net in terms of existing technologies, by the first end of power switch
Enter side, by disjunction auxiliary unit be connected to the second end of power switch and the input negative terminal of DC distribution net, output plus terminal with
And output negative terminal, and current zero-crossing point is produced in DC distribution net rear end failure using disjunction auxiliary unit, so that control
Unit processed direct rupturing duty switch when detecting DC distribution net rear end failure.Therefore, present embodiment passes through in direct current
Current zero-crossing point is actively created during the failure of power distribution network rear end so as to realize quick disjunction, so as to improve breaking speed, enters one
Step improves the security of DC distribution net.
In addition, the disjunction auxiliary unit includes：The deformation topological structure of Z source networks and Z source networks.
In addition, the disjunction auxiliary unit includes：First electric capacity, the second electric capacity, the first inductance and the second inductance；It is described
Second end of power switch connects the first end of first inductance and first electric capacity respectively, and the of first electric capacity
Two ends are used for the output negative terminal for connecting the DC distribution net, and the second end of first inductance is used to connect the DC distribution
The output plus terminal of net, the first end of first electric capacity are also connected with the first end of first inductance, and the of first inductance
Two ends are also connected with the first end of second electric capacity；The first end of second electric capacity is additionally operable to connect the DC distribution net
Output plus terminal, the first end of second inductance are used for the output negative terminal for connecting the DC distribution net, second inductance
First end connects the second end of first electric capacity；Second end of second electric capacity is used to connect the defeated of the DC distribution net
Enter negative terminal, the second end of second electric capacity connects the second end of second inductance, and the second end of second inductance is also used
In the input negative terminal for connecting the DC distribution net.So that whole direct current interruption device can utilize the seldom electronics of number
Device realizes faster breaking speed, and can improve the reliability of direct current interruption device.
In addition, the distressed structure of the Z source networks includes：Embedded Z source networks, Z source networks in parallel and T source networks.
In addition, the Z source networks also include：First energy absorption branch road and the second energy absorption branch road；Described first
Energy absorption branch circuit parallel connection is in first inductance；The second energy absorption branch circuit parallel connection is in second inductance.Pass through energy
Amount, which absorbs branch road, can absorb the energy stored in direct current interruption device after the failure of DC distribution net rear end, be easy to dc circuit breaker
Fast quick-recovery uses.
In addition, the first energy absorption branch road includes：First resistor and the first diode；The of the first resistor
One end connects the first end of first inductance, and the second end of the first resistor connects the first end of first diode,
Second end of first diode connects the second end of first inductance.So as to be realized by simple circuit structure
The absorption of energy.
In addition, the second energy absorption branch road includes：Second resistance and the second diode；The of the second resistance
One one end connects the first end of second inductance, and the second end of the second resistance connects the first of second diode
End, the second end of second diode connect the second end of second inductance.
In addition, first electric capacity is identical with second electric capacity；First inductance is identical with second inductance.From
And disjunction auxiliary unit design difficulty can be reduced.
In addition, the power switch includes full-control type power switch, half control type power switch.
In addition, the full-control type power switch and half control type power switch include：Controllable silicon, insulated gate bipolar crystal
One of pipe, integrated gate commutated thyristor, gated thyristor.
Brief description of the drawings
One or more embodiments are illustrative by the picture in corresponding accompanying drawing, these exemplary theorys
The bright restriction not formed to embodiment, the element for having same reference numbers label in accompanying drawing are expressed as similar element, removed
Non- have a special statement, and composition does not limit the figure in accompanying drawing.
Fig. 1 is the structured flowchart according to first embodiment of the invention direct current interruption device；
Fig. 2 is the structural representation according to first embodiment of the invention direct current interruption device；
Fig. 3 a are the work shapes according to direct current interruption device during first embodiment of the invention DC distribution net normal work
State schematic diagram；
Fig. 3 b are the work according to first embodiment of the invention DC distribution network short circuit fault moment direct current interruption device
View；
Fig. 3 c are direct current interruptions when detecting DC distribution net outlet side rear end failure according to first embodiment of the invention
The working state schematic representation of device；
Fig. 3 d are the working state schematic representations according to DC circuit device after first embodiment of the invention disjunction.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with accompanying drawing to the present invention
Each embodiment be explained in detail.However, it will be understood by those skilled in the art that in each embodiment party of the present invention
In formula, in order that reader more fully understands the application and proposes many ins and outs.But even if without these ins and outs
With many variations based on following embodiment and modification, the application technical scheme claimed can also be realized.
The first embodiment of the present invention is related to a kind of direct current interruption device applied to flexible DC power transmission, and it can also be answered
For other kinds of DC distribution net, the type for the DC distribution net that present embodiment is applied for direct current interruption device is not
Make concrete restriction.The direct current interruption device applied to flexible DC power transmission of present embodiment may be mounted at DC distribution net
Various power input end mouth positions.For example, an office, the power input end mouth in a market etc., if intra-office
Generation short circuit, then direct current interruption device can automatically cut off the power supply of whole office.Present embodiment is for applied to flexibility
The installation site of the direct current interruption device of direct current transportation is not specifically limited.
As shown in figure 1, the direct current interruption device applied to flexible DC power transmission of present embodiment includes：Power switch 1,
Control unit 2 and disjunction auxiliary unit 3.The input side that the first end of power switch 1 is used to connect DC distribution net is (such as straight
Flow the input positive terminal or input negative terminal of power distribution network), the second end connection disjunction auxiliary unit 3 of power switch 1, power switch 1
Control terminal connection control unit 2 output end.Disjunction auxiliary unit 3 is additionally operable to connect the input negative terminal, defeated of DC distribution net
Go out anode and output negative terminal, and for producing current zero-crossing point during terminal shortcircuit after DC distribution net outlet side to control list
First rupturing duty switch, control unit 2 are used for the rupturing duty when detecting DC distribution net outlet side rear end short trouble and opened
Close 1.Present embodiment, the first end of power switch is connected on the input side of DC distribution net, disjunction auxiliary unit is connected to
Second end of the power switch and input negative terminal of DC distribution net, output plus terminal and output negative terminal, and aided in using disjunction
Unit produces current zero-crossing point in DC distribution net outlet side rear end failure, so that control unit is detecting that direct current matches somebody with somebody
Direct rupturing duty switch during power network outlet side rear end failure.Therefore, present embodiment passes through after DC distribution net outlet side
Current zero-crossing point is actively created so as to realize quick disjunction when holding failure, so as to improve breaking speed, is further improved straight
Flow the security of power distribution network.Details is realized to the direct current interruption device applied to flexible DC power transmission of present embodiment below
It is specifically described, herein below only realizes details for convenience of what understanding provided, not implements the necessary of this programme.
As shown in Fig. 2 it is applied to a kind of topological structure of the direct current interruption device of flexible DC power transmission for present embodiment
Schematic diagram.The direct current interruption device applied to flexible DC power transmission of present embodiment includes：Power switch 1, control unit 2 with
And disjunction auxiliary unit 3.Wherein, disjunction auxiliary unit 3 is Z source network structures.Z source networks include：First electric capacity C1, the second electricity
Hold C2, the first inductance L1, the second inductance L2, the first energy absorption branch road and the second energy absorption branch road.The of power switch 1
One end is used for the input side (i.e. the input positive terminal or input negative terminal of DC distribution net) for connecting DC distribution net.Present embodiment
In, the first end of power switch 1 exemplified by connecting the input positive terminal of DC distribution net to illustrate.Second end of power switch 1
The first inductance L1 and the first electric capacity C1 first end are connected respectively, and the first electric capacity C1 the second end is used to connect DC distribution net
Output negative terminal, the first inductance L1 the second end is used for the output plus terminal for connecting DC distribution net, the first electric capacity C1 first end
The first inductance L1 first end is also connected with, the first inductance L1 the second end is also connected with the second electric capacity C2 first end, the second electric capacity
C2 first end is additionally operable to connect the output plus terminal of DC distribution net, and the second inductance L2 first end is used to connect DC distribution net
Output negative terminal, the second inductance L2 first end is also connected with the first electric capacity C1 the second end, and the second electric capacity C2 the second end is used for
The input negative terminal of DC distribution net is connected, the second electric capacity C2 the second end is also connected with the second inductance L2 the second end, the second inductance
L2 the second end is additionally operable to connect the input negative terminal of DC distribution net.
Wherein, the first energy absorption branch circuit parallel connection is in the first inductance L1, and the second energy absorption branch circuit parallel connection is in the second inductance
L2.Specifically, the first energy absorption branch road includes：First resistor R1 and the first diode D1.First resistor R1 first end
The first inductance L1 first end is connected, first resistor R1 the second end connects the first diode D1 first end (present embodiment
In be the first diode negative pole), the first diode D1 the second end (being the positive pole of the first diode in present embodiment) even
Connect the first inductance L1 the second end.Second energy absorption branch road includes：Second resistance R2 and the second diode D2.Second resistance
R2 first one end connects the second inductance L2 first end, and second resistance R2 the second end connects the second diode D2 first end
(being the negative pole of the second diode in present embodiment), the second diode D2 the second end (is the two or two pole in present embodiment
The positive pole of pipe) connection the second inductance L2 the second end.The direct current interruption device of present embodiment passes through after power switch shut-off
The mode of resistant series backward dioded consumes the dump energy in circuit.
In some instances, the first end of power switch can also connect the input negative terminal of DC distribution net.Wherein, when
When control unit detects that short trouble occurs in DC distribution net input side rear end, the direct rupturing duty of meeting is switched to disconnect direct current
Power distribution network, therefore, power switch connect the input positive terminal or input negative terminal of DC distribution net, can play phase same-action.This
Art personnel can determine its connected mode with disjunction auxiliary unit according to the characteristic of power switch, no longer detailed herein
State.
It should be noted that in present embodiment, the first electric capacity is identical with the second electric capacity, the first inductance and the second inductance phase
Together, first resistor is identical with second resistance, and the first diode is identical with the second diode, so that the knot of direct current interruption device
Structure is more simple, reduces design difficulty.Whether present embodiment is identical not for foregoing electric capacity, resistance, inductance and diode
Do concrete restriction.
It is noted that in present embodiment, power switch can use full-control type power switch or half control type work(
Rate switchs.Wherein, full-control type power switch and half control type power switch can include：Controllable silicon (Silicon
Controlled Rectifier, SCR), insulated gate bipolar transistor (Insulated Gate Bipolar
Transistor, IGBT), integrated gate commutated thyristor (Intergrated Gate Commutated Thyristors,
IGCT), one of gated thyristor (GateTurn-OffThyristor, GTO).Present embodiment for power switch not
Make concrete restriction.
The course of work of the direct current interruption device of present embodiment is described as follows below：
The direct current interruption device of present embodiment is accessed into flexible DC power transmission net first, and (or other kinds of direct current is matched somebody with somebody
Power network).Wherein, the attachment structure of direct current interruption device and DC distribution net is as shown in Figure 2.The rheometer that power switch is flowed through
Make input current Iin, input terminal voltage is denoted as Vin, and output end voltage is denoted as Vout.
As shown in Figure 3 a, when DC distribution net normal work, power switch 1 is conducting state, and now electric current is from direct current
Source anode (i.e. DC distribution net input positive terminal+) starts, and through power switch 1, through the first inductance L1, through transmission line of electricity and loads,
Through the second inductance L2, DC source negative terminal (i.e. DC distribution net input negative terminal -) is returned to.Wherein, the first inductance L1 and the second inductance
Pressure drop on L2 is zero, and the first electric capacity C1 and the second electric capacity C2 terminal voltage are equal to DC source voltage, pass through the first electric capacity C1
Electric current with the second electric capacity C2 is zero, passes through first resistor R1, second resistance R2, the first diode D1 and the second diode D2
Electric current be also zero.It is seen that in DC distribution net normal work, the power part of the direct current interruption device of present embodiment
Point (power section includes：Power switch 1, the first electric capacity C1, the second electric capacity C2, the first inductance L1, the second inductance L2, the first electricity
Hinder R1, second resistance R2, the first diode D1 and the second diode D2) in, on-state power consumption be present in only one power switch 1,
Therefore, the on-state power consumption of the direct current interruption device of present embodiment is extremely low.
As shown in Figure 3 b, when DC distribution net outlet side rear end short trouble moment, the voltage at the end of power switch 1 second are
First electric capacity C1 and the second electric capacity C2 voltage sums, the Vin equal to 2 times, higher than the terminal voltage of power switch 1 first.Due to power
Switch 1 can not reverse-conducting, so now Iin is zero.A period of time after the short trouble of DC distribution net outlet side rear end
Interior, the first electric capacity C1 and the second electric capacity C2 discharge, and the first inductance L1 and the second inductance L2 charge.First electric capacity C1 and the second electric capacity
The C2 velocity of discharge and the first electric capacity C1, the second electric capacity C2 electric capacity value and the first inductance L1, the second inductance L2 inductance
Value is relevant.Assuming that the first electric capacity C1 is identical with the second electric capacity C2 capacitance, due to the first electric capacity C1's and the second electric capacity C2
Voltage is identical, when the first electric capacity C1, the second electric capacity C2 tension discharge to half Vin when, power switch 1 is again by forward direction
Conducting.First electric capacity C1, the second electric capacity C2 voltage discharge time are denoted as into T, and (wherein, T is the first electric capacity C1, the second electric capacity
The time that C2 terminates since electric discharge to electric discharge, voltage when the first electric capacity C1, the second electric capacity C2 electric discharge start are equal to Vin, put
Voltage at the end of electricity is equal to half Vin).Therefore, can be by the way that the capacitance of the first electric capacity, the second electric capacity be calculated
And first inductance and the second inductance inductance value so that discharge time T meets：Control unit can be complete in T time
Into the fault detect of DC distribution net, and switch-off power switchs when Iin is equal to zero.It is seen that present embodiment is by dividing
When disconnected auxiliary unit short trouble occurs in DC distribution net outlet side rear end, actively, rapidly it can be created for power switch
Current zero-crossing point (i.e. so that the electric current in power switch is substantially zeroed), so as to provide condition for switch-off power switch.
In present embodiment, after detection mode well known to those skilled in the art can be used to DC distribution net outlet side
The failure at end is detected, and here is omitted, and present embodiment is not specifically limited to this.
Such as Fig. 3 c, when control unit 2 detects that DC distribution net outlet side rear end is broken down, power switch 1 is sent out
Go out control signal (cut-off signals).Because the direct current interruption device of present embodiment can be short in DC distribution net outlet side rear end
Lu Shi, realize that input side electric current is reduced rapidly to zero, therefore can be that control unit switch-off power switch creates precondition, because
This, control unit is in terminal shortcircuit after detecting DC distribution net outlet side, you can is quickly detected the input of direct current interruption device
Side electric current (i.e. Iin) is reduced to zero, and control unit is in terminal shortcircuit after detecting DC distribution net outlet side and input side
Electric current can immediately turn off power switch when being zero.
As shown in Figure 3 d, after power switch 1 turns off, the first electric capacity C1 and the electricity of the first inductance L1, the second electric capacity C2 and second
Feel L2 and LC series connection concussions, final first inductance L1, the second inductance L2, the first electric capacity C1 and second are occurred by failure generating loop
The energy stored in electric capacity C2 is all consumed by first resistor R1 and second resistance R2.So that direct current interruption device can
To resume work again.For Fig. 3 a into 3d, solid black lines indicate electric current, and dotted line represents no electric current.
Present embodiment compared with prior art, current over-zero is created after first detecting failure for conventional solid-state formula breaker
The shortcomings that break of the point again present in disjunction pattern is long, by the way that the power switch of direct current interruption device is connected on into DC distribution
The input side of net, and actively create current over-zero when DC distribution net outlet side rear end is broken down using disjunction auxiliary unit
Point, so that control unit directly carries out disjunction when detecting dc circuit breaker failure.Therefore, present embodiment is detecting
To disjunction can be carried out during failure at once, the creation process of current zero-crossing point is eliminated, so as to greatly accelerate point of breaker
Disconnected speed, be advantageous to further improve the security of DC distribution net.The solid-state open circuit for the new construction that present embodiment is proposed
Device, relative to mechanical breaker and hybrid circuit breaker, due to no mechanical structure, so electric current is zero during shut-off, will not
Produce electric arc, thus without arc extinguishing, non-aging, service life is longer and avoids maintenance, while cost is lower.In addition, by
It is seldom in the device count of present embodiment, so security reliability can also be improved.Also, present embodiment occurs in failure
When, DC source is provided by the electric capacity in disjunction auxiliary unit and inductance, both controlled equivalent to off-state, fault current completely
The size of fault current, and protective effect is served to dc source.
Second embodiment of the present invention is related to a kind of direct current interruption device.Second embodiment is big with first embodiment
Cause identical, be in place of the main distinction：In second embodiment of the invention, other realization sides of disjunction auxiliary unit are defined
Case, enrich embodiment of the present invention.
Specifically, the disjunction auxiliary unit of the direct current interruption device of present embodiment is topological using the deformation of Z source networks
Structure.For example, those skilled in the art can design for example embedded Z sources net on the basis of aforementioned embodiments
The deformation topological structure of the Z source networks of network, Z source networks in parallel and T source networks etc., change of the present embodiment for Z source networks
Shape topological structure repeats no more.
It is noted that each module involved in present embodiment is logic module, and in actual applications, one
Individual logic unit can be a part for a physical location or a physical location, can also be with multiple physics lists
The combination of member is realized.In addition, in order to protrude the innovative part of the present invention, will not be with solving institute of the present invention in present embodiment
The unit that the technical problem relation of proposition is less close introduces, but this is not intended that in present embodiment and other lists are not present
Member.
It will be understood by those skilled in the art that the respective embodiments described above are to realize the specific embodiment of the present invention,
And in actual applications, can to it, various changes can be made in the form and details, without departing from the spirit and scope of the present invention.
Claims (10)
- A kind of 1. direct current interruption device applied to flexible DC power transmission, it is characterised in that including：Power switch, control unit And disjunction auxiliary unit；The first end of the power switch is used for the input side for connecting the DC distribution net, and the second end of the power switch connects Connect the disjunction auxiliary unit, the output end of the control terminal connection described control unit of the power switch；The disjunction auxiliary unit is additionally operable to connect the input negative terminal of the DC distribution net, output plus terminal and output negative terminal, And for current zero-crossing point to be produced during terminal shortcircuit after the DC distribution net outlet side so as to described in described control unit cut-out Power switch；Described control unit is opened for cutting off the power when detecting the DC distribution net outlet side rear end short trouble Close.
- 2. the direct current interruption device according to claim 1 applied to flexible DC power transmission, it is characterised in that the disjunction Auxiliary unit includes：The deformation topological structure of Z source networks and Z source networks.
- 3. the direct current interruption device according to claim 2 applied to flexible DC power transmission, it is characterised in that the Z sources Network includes：First electric capacity, the second electric capacity, the first inductance and the second inductance；Second end of the power switch connects the first end of first inductance and first electric capacity respectively, and described first Second end of electric capacity is used for the output negative terminal for connecting the DC distribution net, and the second end of first inductance is described for connecting The output plus terminal of DC distribution net, the first end of first electric capacity are also connected with the first end of first inductance, and described first Second end of inductance is also connected with the first end of second electric capacity；The first end of second electric capacity is additionally operable to connect the output plus terminal of the DC distribution net, and the first of second inductance The output negative terminal for connecting the DC distribution net is held, the first end of second inductance is also connected with the second of the first electric capacity End；Second end of second electric capacity is used for the input negative terminal for connecting the DC distribution net, the second end of second electric capacity The second end of the second inductance is also connected with, the input that the second end of second inductance is additionally operable to connect the DC distribution net is born End.
- 4. the direct current interruption device according to claim 2 applied to flexible DC power transmission, it is characterised in that the Z sources The distressed structure of network includes：Embedded Z source networks, Z source networks in parallel and T source networks.
- 5. the direct current interruption device according to claim 3 applied to flexible DC power transmission, it is characterised in that the Z sources Network also includes：First energy absorption branch road and the second energy absorption branch road；The first energy absorption branch circuit parallel connection is in first inductance；The second energy absorption branch circuit parallel connection is in second inductance.
- 6. the direct current interruption device according to claim 5 applied to flexible DC power transmission, it is characterised in that described first Energy absorption branch road includes：First resistor and the first diode；The first end of the first resistor connects the first end of first inductance, described in the second end connection of the first resistor The first end of first diode, the second end of first diode connect the second end of first inductance.
- 7. the direct current interruption device according to claim 5 applied to flexible DC power transmission, it is characterised in that described second Energy absorption branch road includes：Second resistance and the second diode；The first end of the second resistance connects the first end of second inductance, described in the second end connection of the second resistance The first end of second diode, the second end of second diode connect the second end of second inductance.
- 8. the direct current interruption device according to claim 3 applied to flexible DC power transmission, it is characterised in that described first Electric capacity is identical with second electric capacity；First inductance is identical with second inductance.
- 9. the direct current interruption device according to claim 1 applied to flexible DC power transmission, it is characterised in that the power Switch includes full-control type power switch, half control type power switch.
- 10. the direct current interruption device according to claim 9 applied to flexible DC power transmission, it is characterised in that described complete Control type power switch and half control type power switch include：Controllable silicon, insulated gate bipolar transistor, integrated gate commutated brilliant lock One of pipe, gated thyristor.
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| CN201710665510.4A CN107516876A (en) | 2017-08-07 | 2017-08-07 | A kind of direct current interruption device applied to flexible DC power transmission |
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| CN201710665510.4A CN107516876A (en) | 2017-08-07 | 2017-08-07 | A kind of direct current interruption device applied to flexible DC power transmission |
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| CN110350496A (en) * | 2019-07-12 | 2019-10-18 | 山东大学 | A kind of multiterminal flexible direct current electric network fault current-limiting method and device |
| CN110672972A (en) * | 2019-09-09 | 2020-01-10 | 华北电力大学 | Fault positioning and isolating method for flexible direct current distribution network |
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Application publication date: 20171226 |