CN206790085U - Short-circuit protection, earthing or grounding means, current conversion station and DC transmission system - Google Patents
Short-circuit protection, earthing or grounding means, current conversion station and DC transmission system Download PDFInfo
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- CN206790085U CN206790085U CN201720572893.6U CN201720572893U CN206790085U CN 206790085 U CN206790085 U CN 206790085U CN 201720572893 U CN201720572893 U CN 201720572893U CN 206790085 U CN206790085 U CN 206790085U
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 177
- 230000005540 biological transmission Effects 0.000 title claims abstract description 170
- 230000008878 coupling Effects 0.000 claims abstract description 11
- 238000010168 coupling process Methods 0.000 claims abstract description 11
- 238000005859 coupling reaction Methods 0.000 claims abstract description 11
- 230000007935 neutral effect Effects 0.000 claims description 32
- 230000006698 induction Effects 0.000 claims description 10
- 230000008859 change Effects 0.000 claims description 8
- 230000005404 monopole Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 15
- 230000005611 electricity Effects 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 3
- 230000003139 buffering effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
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- 238000002955 isolation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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- 239000007787 solid Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
Present disclose provides a kind of short-circuit protection (400), it is configured as coupling with DC transmission system, DC transmission system includes at least one current conversion station, and current conversion station is configured as performing the conversion between alternating electromotive force and direct current power.Short-circuit protection (400) includes：Main resistor unit (401), main resistor unit (401) include at least one resistor.Main resistor unit (401) can be coupling between the earthing pole of at least one current conversion station and the earth point of DC transmission system, to consume the fault current on the earthing pole that at least one current conversion station is appeared in the short trouble of DC transmission system.Additionally provide a kind of earthing or grounding means, current conversion station and DC transmission system with the short-circuit protection (400).The short-circuit protection (400) can be by the earth-fault current in the rapid decaying dc transmission system of simple structure without having a negative impact to electrical equipment in current conversion station.
Description
Technical field
Embodiment of the present disclosure is related to DC transmission system, especially HVDC transmission system (HVDC), and should
Short-circuit protection, earthing or grounding means and current conversion station in DC transmission system.
Background technology
HVDC (HVDC) technology of transmission of electricity is a kind of important and superior power transmission technology.HVDC (HVDC)
Alternating current from AC network is converted to direct current by technology of transmission of electricity by current conversion station, then passes through the direct current after conversion
DC transmission line carries out long-distance transmissions, and direct current is converted into alternating current for using by current conversion station again at by electricity.
Current conversion station includes converter (or being switching valve).(IGCT or transistor are (such as using semiconductor switch device for converter
Igbt, i.e. IGBT)) it is direct current by AC rectification with the combination of diode or by DC inverter is
Alternating current.
In HVDC transmission system, any position that may be in current conversion station or in DC transmission line occurs mutually to be grounded
Short trouble., it is necessary to as soon as possible disconnect AC circuit breaker with by current conversion station and alternating current after phase ground short circuit failure occurs
Net isolation, to protect current conversion station.However, in some cases, fault current caused by phase ground short circuit failure may contain phase
When big DC component, this can cause the relatively long delay before the fault current zero passage by AC circuit breaker, and
AC circuit breaker can not realize disconnection so as to can not outage electric current rapidly during the time delay.Such case is usually not
It is desired and delayed zero crossing can be referred to as.Delayed zero crossing is probably that AC circuit breaker disconnects difficult or even can not disconnected, and
The deterioration even failure of AC circuit breaker may be caused.
In HVDC transmission system, neutral pole generally is provided with the converter of current conversion station, neutral pole connection
To the earth.Fault current caused by phase ground short circuit failure can occur point with failure by the earth and the neutral pole of ground connection and be formed back
Road so that the electrical equipment that fault current will be all flowed through in the current conversion station that is connected with neutral pole.On the other hand, occur to reduce
The climbing speed of sizable fault current is generally provided with protecting electrical equipment in direct current pole or neutral pole during short trouble
The reactor of Large Copacity is with buffer failure electric current.And the big induction reactance of the reactor of Large Copacity also causes the decay of fault current to become
Very slow, this causes the electrical equipment that big fault current will flow through in the current conversion station that is connected with neutral pole for a relatively long period of time,
Diode (valve diode) especially in converter.This is so as to these electrical equipments (diode especially in converter)
The high request to surge current ability to bear is proposed, especially when dc circuit breaker can not disconnect fault current.At some
In the case of, it may be difficult to meet the high request to this surge current ability to bear of diode.
A kind of scheme is presently, there are, i.e., snubber resistor is installed in the converter in current conversion station.But this will change
The physical Design of converter unit, so as to result in the need for redesigning, test new converter unit and need to be existing
The converter unit that transmission system more renews.Moreover, installed inside converter unit snubber resistor be also possible to bring it is potential
Damage risk, that is, when consuming fault current, caused high temperature may burn out converter to snubber resistor in circuit.
Utility model content
The purpose of this utility model is to provide a series of schemes, at least partly to solve the above problems.
Each embodiment of the disclosure based on the further recognition that：When the generation phase ground short circuit in HVDC transmission system
During failure, due to generally having the earthing pole for being connected to the earth in HVDC transmission system, no matter the short trouble occurs
Still occur in the AC of HVDC transmission system on DC power transmission line, fault current caused by short circuit can all pass through
The earth returns to fault point at the earth point of HVDC transmission system via earthing pole, is consequently formed short circuit and closes back
Road, as illustrated by the arrows in fig. 1.That is, the earth point of HVDC transmission system is the only way which must be passed of fault current.
In view of recognizing above, the disclosure proposes for short-circuit protection to be arranged on the earth point position of DC transmission system,
So that short-circuit protection be located in the current path of fault current in order to by the resistor in short-circuit protection come fast
Fast wear-out failure electric current, at the same the short-circuit protection again not in the normal current path of DC transmission system, so as to avoid
Redesign and replacement to the related electric equipment in the normal current path of DC transmission system, and avoid due to short circuit
Protection device is in high temperature caused by wear-out failure electric current to the damage risk of the electrical equipment in normal current path.
According to embodiment of the present utility model, there is provided a kind of short-circuit protection, it is configured as and DC power transmission system
System coupling.The DC transmission system includes at least one current conversion station, the current conversion station be configured as performing alternating electromotive force with it is straight
Flow the conversion between electric power.The short-circuit protection includes：Main resistor unit, the main resistor unit include at least one
Individual resistor；Wherein described main resistor unit can be coupling at least one current conversion station earthing pole and the direct current it is defeated
Between the earth point of electric system, at least one change of current is appeared in the short trouble of the DC transmission system with consumption
The fault current on earthing pole stood.
According to embodiment of the present utility model, the current conversion station is bipolar current conversion station, and it includes positive pole, negative pole and coupling
To the positive pole and the neutral pole of negative pole, earthing pole of the neutral pole as the current conversion station.
According to embodiment of the present utility model, the current conversion station is monopole current conversion station, and it includes negative or positive electrode, and wraps
Include earthing pole.
According to embodiment of the present utility model, the short-circuit protection also includes breaker, the breaker and institute
State main resistor unit and be connected in the earthing pole of at least one current conversion station and the earth point of the DC transmission system in parallel
Between, and the signal receiving end of the breaker can couple with the short-circuit detecting device of the DC transmission system so that
The short circuit event being not received by the breaker in the instruction DC transmission system for coming from the short-circuit detecting device
The breaker is remained closed to bypass the main resistor unit in the case of the signal of barrier, and is received in the breaker
To described in the case of the signal for coming from the short trouble in the instruction DC transmission system of the short-circuit detecting device
Breaker disconnects.
According to embodiment of the present utility model, the short-circuit protection also includes reactor.The reactor and institute
State main resistor unit and be connected in series in the earthing pole of at least one current conversion station and the earth point of the DC transmission system
Between.
According to embodiment of the present utility model, the short-circuit protection also includes breaker and reactor.It is described disconnected
Road device and the main resistor unit are connected in parallel to form the first parallel circuit, and first parallel circuit further with institute
Reactor is stated to be connected in series between the earthing pole of at least one current conversion station and the earth point of the DC transmission system, and
And the signal receiving end of the breaker can couple with the short-circuit detecting device of the DC transmission system so that described disconnected
Road device is not received by the signal of the short trouble in the instruction DC transmission system for coming from the short-circuit detecting device
In the case of the breaker remain closed to bypass the main resistor unit, and receive and come from the breaker
The breaker breaks in the case of the signal of short trouble in the instruction DC transmission system of the short-circuit detecting device
Open.
According to embodiment of the present utility model, the short-circuit protection also includes booster resistor unit.It is described attached
Resistor unit is added to be connected in the both ends being connected in series of first parallel circuit and the reactor in parallel.
According to embodiment of the present utility model, the short-circuit protection also includes reactor.The reactor and institute
State main resistor unit and be connected in the earthing pole of at least one current conversion station and the earth point of the DC transmission system in parallel
Between.
According to embodiment of the present utility model, the short-circuit protection also includes breaker, the breaker and institute
Main resistor unit is stated to be connected in series and be connected in parallel with the reactor.The signal receiving end of the breaker can with it is described
The short-circuit detecting device coupling of DC transmission system so that be not received by the breaker and come from the short-circuit detecting dress
The breaker remains open in the case of the signal of short trouble in the instruction DC transmission system put, and in institute
State breaker and receive the signal for coming from the short trouble in the instruction DC transmission system of the short-circuit detecting device
In the case of the breaker closing flowed through with allowing to appear in the fault current on the earthing pole of at least one current conversion station
The main resistor unit.
According to embodiment of the present utility model, the main resistor unit has according at least one in the following institute really
Fixed total resistance value：The desired die-away time of fault current on the earthing pole of at least one current conversion station, and it is described straight
The size for the electric current that stream transmission system is transmitted.
According to embodiment of the present utility model, the main resistor unit has according at least one in the following institute really
Fixed total resistance value：The desired die-away time of fault current on the earthing pole of at least one current conversion station, the direct current
The size for the electric current that transmission system is transmitted, and the induction reactance value size of the reactor.
According to embodiment of the present utility model, the all-in resistance of the main resistor unit can be more than 5 ohm.
According to embodiment of the present utility model, have what is be connected in parallel with main resistor unit in short-circuit protection
In the case of reactor, the all-in resistance of the main resistor unit is higher than induction reactance value of the reactor in the case where flowing through 50Hz electric currents
30%.
According to embodiment of the present utility model, have in short-circuit protection and be connected in parallel with booster resistor unit
Reactor in the case of, the all-in resistance of the booster resistor unit is higher than sense of the reactor in the case where flowing through 50Hz electric currents
The 30% of anti-value.
According to embodiment of the present utility model, there is provided a kind of earthing or grounding means, it is included according to of the present utility model above-mentioned
The short-circuit protection of one of each embodiment.
According to embodiment of the present utility model, the earthing or grounding means also includes earthing pole and earth bus, the short circuit
Protection device is connected between the earthing pole of the earthing or grounding means and the earth bus, and the earth bus is connectable to directly
Flow the earthing pole of at least one current conversion station of transmission system, the current conversion station be configured as performing alternating electromotive force and direct current power it
Between conversion.
According to embodiment of the present utility model, a kind of current conversion station is also provided, is configured as being converted to alternating electromotive force directly
Direct current power is converted to alternating electromotive force and has earthing pole by stream electric power.The current conversion station is included according on of the present utility model
State the short-circuit protection of one of each embodiment.The short-circuit protection be connected to the earthing pole of the current conversion station with it is described
Between the earth point of DC transmission system.
According to embodiment of the present utility model, the current conversion station is bipolar current conversion station, and it includes positive pole, negative pole and coupling
To the positive pole and the neutral pole of negative pole, earthing pole of the neutral pole as the current conversion station.
According to embodiment of the present utility model, a kind of DC transmission system is also provided, including power transmission current conversion station and at least
One is configured as alternating electromotive force being converted to direct current power by electric current conversion station, the power transmission current conversion station, and described is changed by electricity
Stream station is configured as direct current power being converted to alternating electromotive force, it is characterised in that the DC transmission system also includes at least one
The individual short-circuit protection according to one of the respective embodiments described above of the present utility model.The short-circuit protection is connected to described
Between power transmission current conversion station and at least one earthing pole and the earth point of the DC transmission system in by electric current conversion station.
According to embodiment of the present utility model, a kind of DC transmission system is also provided, including power transmission current conversion station and at least
One is configured as alternating electromotive force being converted to direct current power by electric current conversion station, the power transmission current conversion station, and described is changed by electricity
Stream station is configured as direct current power being converted to alternating electromotive force, it is characterised in that the DC transmission system also includes at least one
The individual earthing or grounding means according to one of the respective embodiments described above of the present utility model.The earthing or grounding means is connected to the power transmission change of current
Stand between at least one earthing pole in by electric current conversion station and the earth point of the DC transmission system.
According to embodiment of the present utility model, the earthing pole of the power transmission current conversion station and each it is grounded by electric current conversion station
Pole connects each other by wire, and at least one earthing or grounding means is connected to the ground connection of the wire and the DC transmission system
Between point.
According to embodiment of the present utility model, the earthing pole of the power transmission current conversion station and each it is grounded by electric current conversion station
Pole connects a single earthing or grounding means respectively, each earthing or grounding means be connected to corresponding power transmission current conversion station or
Between by the earthing pole of electric current conversion station and the earth point of the DC transmission system.
Brief description of the drawings
The above and other purpose and characteristic of the disclosure combine will become more to the detailed description of appended accompanying drawing below
Substantially, wherein：
Fig. 1 is the schematic diagram of the DC transmission system of prior art；
Fig. 2 is provided with the signal of the DC transmission system of the short-circuit protection of one embodiment according to the disclosure
Figure；
Fig. 3 is the schematic diagram according to the short-circuit protection of another embodiment of the present disclosure；
Fig. 4 is the schematic diagram according to the short-circuit protection of another embodiment of the present disclosure；
Fig. 5 is the schematic diagram according to the short-circuit protection of another embodiment of the present disclosure；
Fig. 6 is the schematic diagram according to the short-circuit protection of another embodiment of the present disclosure；
Fig. 7 is the schematic diagram according to the short-circuit protection of another embodiment of the present disclosure；
Fig. 8 is the schematic diagram according to the short-circuit protection of another embodiment of the present disclosure；
Fig. 9 is provided with another DC transmission system of the short-circuit protection of one embodiment according to the disclosure
Schematic diagram；
Figure 10 is provided with another DC transmission system of the short-circuit protection of one embodiment according to the disclosure
Schematic diagram；And
Figure 11 is to show DC transmission system of the prior art and the direct current transportation according to embodiment of the present disclosure
The chart of the decay of fault current in the diode in system.
Make a general survey of the figures above, identical reference will be understood to refer to identical, similar or corresponding feature or
Function.
Embodiment
Reference will be made to embodiment of the disclosure now, one or more examples of embodiment are as shown by accompanying drawing.It is real
Apply example to be provided by the elaboration of the disclosure, and be not intended as the limitation to the disclosure.For example, as one embodiment
Feature shown or described by a part may be used to generate further embodiment in another embodiment.The disclosure
It is intended to include belonging to these and other modifications and variations of disclosure scope and spirit.
Fig. 2 is provided with the signal of the DC transmission system of the short-circuit protection of one embodiment according to the disclosure
Figure.The DC transmission system includes two current conversion stations 100,200, and wherein current conversion station 100 includes two turns as power transmission current conversion station
Parallel operation 101,101 ', for the alternating electromotive force from AC network to be converted into direct current power.In each converter 101,101 '
Including switching device, to realize AC rectification as direct current.Switching device in converter 101,101 ' can be ability
Known IGCT or transistor, conventional transistor are, for example, igbt in domain, i.e. IGBT.
Generally also include diode in transistor (such as IGBT) is used as the converter 101,101 ' of switching device,
The conversion between alternating current and direct current is realized with switching device configuration.Each converter 101,101 ' passes through converter power transformer
102nd, 102 ' pole of alternating electromotive force is connected to, and direct current is conveyed to DC power transmission line by respective output stage 105,105 '
One in electricity, wherein output stage 105,105 ' is positive pole, and another is negative pole.In output stage 105,105 ' and DC transmission line
Breaker 103,103 ' and reactor 104,104 ' are also normally provided between road.Reactor 104,104 ' appears in for buffering
The surge current rate of climb of electric current (reduce) on the output stage of converter and dc circuit breaker, to protect converter and straight
Flow breaker.The respective earthing pole of converter 101,101 ' connects to each other to form neutral pole 106 and for being grounded.Thus,
Power transmission current conversion station 100 in Fig. 2 is formed as the bipole arrangement with two output stages and a neutral pole.
Current conversion station 200 can have the construction similar with power transmission switching station as by electric current conversion station.By electric current conversion station 200
Including two converters (or being switching valve) 201,201 ', for the direct current power from DC power transmission line to be converted into friendship
Flow electric power.Converter 201,201 ' realizes the inversion from alternating current to direct current also by switching device.By electric current conversion station 200 with
Power transmission current conversion station 100 accordingly also has two input poles 205,205 ' and a neutral pole 206, so as to also form bipolar match somebody with somebody
Put.Two output stages 205,205 ' are connected respectively to DC power transmission line to receive direct current.One in output stage 205,205 '
Individual is positive pole, and another is negative pole.Neutral pole 206 is also used for being grounded.It can also be included converter power transformer by electric current conversion station 200
202nd, 202 ', the conventional electrical element such as breaker 203,203 ', reactor 204 and 204 '.
It should be appreciated that power transmission current conversion station 100 and the converter in by electric current conversion station 200 can be opened with various known and future
The device of hair and various circuit structures are realized, as long as the mutual conversion between alternating electromotive force and direct current power can be realized.Also
It should be appreciated that power transmission current conversion station 100 and be not limited to by electric current conversion station 200 above with respect to the construction described by Fig. 2, it can be with
Include other various possible electrical equipments respectively.For example, power transmission current conversion station 100 and by electric current conversion station 200 can also include connect
It is connected to the arrester of earthing pole.
In Fig. 2 embodiment, the neutral pole 106 of power transmission current conversion station 100 and the neutral pole 206 by electric current conversion station 200
Connected by wire 300.Wire 300 is connected to an earth point by short-circuit protection 400, so as to by power transmission current conversion station
100 neutral pole 106 and it is grounded by the neutral pole 206 of electric current conversion station 200, and then DC transmission system is grounded.
In Fig. 2 embodiment, short-circuit protection 400 includes main resistor unit 401.Main resistor unit 401
It can be formed by a single resistor, or be formed by the series connection and/or be connected in parallel of multiple resistors.Main resistor list
Member 401 is coupling between the wire 300 and the earth point of DC transmission system of the neutral pole of connection current conversion station.If direct current transportation
Occurs phase earth fault in system, caused fault current (especially DC component) will flow through short-circuit protection dress by earth point
Put the main resistor unit 401 in 400 so that the resistor in main resistor unit 401 largely generates heat and quickly consumes failure
Electric current.Due to the rapid decay of the DC component of fault current, the exchange in the breaker of the AC in DC transmission system
Electricity can rapidly reach zero passage, so as to realize that the breaker of AC rapidly disconnects, by AC network and direct current
Transmission system is isolated.Meanwhile the rapid decay of fault current can also make each electrical equipment (especially converter in current conversion station
Interior diode) time for being subjected to major break down electric current significantly shortens, high surge current is resistant to these electrical equipments so as to reduce
The requirement of ability.
From the fault current decay chart shown in Figure 11, there is provided the short-circuit protection according to the present embodiment
In 440 system, die-away time (in figure shown in dotted line) phase of the fault current in the diode for the converter for flowing through current conversion station
Than in the die-away time (figure for the corresponding failure electric current being not provided with the system of the short-circuit protection 440 of the present embodiment
In it is shown in solid) greatly shorten.
Moreover, in various embodiments, short-circuit protection 400 be located at the earth point of DC transmission system nearby without
It is in the converter being located in current conversion station.So, the increase of short-circuit protection 400 has converter without modifications or substitutions,
So as to implement this programme in a manner of simple, cost-effective.Moreover, short-circuit protection 400 is in wear-out failure electric current
Caused big calorimetric also will not bring adverse effect to electrical equipments such as converters.
The earth point that short-circuit protection 400 can be installed in DC transmission system by various appropriate forms is attached
Closely.For example, in one embodiment, short-circuit protection 400 can be connected to the connection change of current as a single module
Between the wire 300 and the earthing or grounding means of DC transmission system of the neutral pole stood, and it is grounded by earthing or grounding means.
Alternatively, short-circuit protection 400 can also be integrated in earthing or grounding means as a part for earthing or grounding means.Specifically
Ground, earthing or grounding means generally include earthing pole and earth bus.Short-circuit protection 400 can be connected to the earthing pole of earthing or grounding means
Between earth bus and as a part for earthing or grounding means.Thus, by the way that the earth bus of earthing or grounding means is connected into direct current
The earthing pole (such as by being connected to wire 300) of the current conversion station of transmission system, and the earthing pole of earthing or grounding means is grounded, it is also real
Connection of the short-circuit protection 400 between the earthing pole and earth point of current conversion station is showed.
And for example, in some embodiments, it is also possible to be changed using short-circuit protection 400 as power transmission current conversion station 100 or by electricity
Flow the part at station 200 and be connected to the earthing pole of current conversion station, as long as by short-circuit protection 400 away from the important electricity such as converter
Gas equipment is situated so as to its radiating.
In Fig. 2 embodiment, pass through wire 300 due to power transmission current conversion station 100 and by the neutral pole of electric current conversion station 200
It is connected.Thus, as long as power transmission current conversion station can be achieved in any position that a short-circuit protection 400 is connected to wire 300
100 and the ground connection by electric current conversion station 200.It is understood, however, that can also be in parallel by more than one short-circuit protection 400
Wire 300 is connected to, and this multiple short-circuit protection 400 is grounded respectively.
Fig. 3 is the schematic diagram according to the short-circuit protection of another embodiment of the present disclosure.In this embodiment, it is short-circuit
Protection device 400 has main resistor unit 401 and the breaker 402 in parallel with main resistor unit 401.Breaker 402
Signal receiving end couples with the short-circuit detecting device of DC transmission system.Fig. 3 short-circuit protection 400 can be with alternate figures 2
Short-circuit protection 400 and be connected between the earthing pole of current conversion station and the earth point of DC transmission system.In breaker 402
In the case of the signal for the short trouble being not received by the instruction DC transmission system for coming from short-circuit detecting device, open circuit
Device 402 is remained closed to bypass main resistor unit 401.
In such an arrangement, when no generation phase ground short circuit failure, almost without electricity in main resistor unit 401
Stream is flowed through, and power attenuation is caused in the normal work of DC transmission system so as to avoid main resistor unit 401.In open circuit
In the case that device 402 receives the signal for coming from the short trouble in the instruction DC transmission system of short-circuit detecting device, break
Road device 402 is controlled as disconnecting automatically.So, main resistor unit 401 can be accessed current conversion station rapidly after failure generation
Earthing pole and earth point between current path, so as to quickly consuming fault current.Due to break down electric current when positioned at connecing
Voltage on earth polar is generally very low, so breaker 402 is only needed for low-voltage circuit breaker, thus for breaker cost compared with
It is low.Moreover, short-circuit detecting device is usually the existing device in existing DC transmission system, or can be defeated by existing direct current
Various sensing device furthers in electric system are readily available.Therefore, the cost of the short-circuit protection 400 of the embodiment also compared with
It is low.
Fig. 4 is the schematic diagram according to the short-circuit protection of another embodiment of the present disclosure.In Fig. 4, short-circuit protection fills
Putting 400 has main resistor unit 401 and the reactor 403 connected with main resistor unit 401.Fig. 4 short-circuit protection
400 can be connected to the earthing pole of current conversion station and the earth point of DC transmission system with the short-circuit protection 400 in alternate figures 2
Between.Main resistor unit 401 accesses the electric current road between the earthing pole of current conversion station and the earth point of DC transmission system all the time
Quickly to consume fault current when breaking down electric current in footpath.Reactor 403 can then delay when short trouble occurs
Fault current reaches the time of peak-peak.Therefore, the combination of main resistor unit 401 and reactor 403 can provide more
Comprehensive short-circuit protection.
Fig. 5 is the schematic diagram according to the short-circuit protection of another embodiment of the present disclosure.In Figure 5, short-circuit protection fills
Putting 400 has main resistor unit 401 and the reactor 403 in parallel with main resistor unit 401.Fig. 5 short-circuit protection
400 can be connected to the earthing pole of current conversion station and the earth point of DC transmission system with the short-circuit protection 400 in alternate figures 2
Between.Main resistor unit 401 and reactor 403 in Fig. 5 also all access earthing pole and the direct current transportation in current conversion station all the time
In current path between the earth point of system, thus similarly more comprehensive short circuit can be also provided with the embodiment in Fig. 4
Protection.
Fig. 6 is the schematic diagram according to the short-circuit protection of another embodiment of the present disclosure.In figure 6, short-circuit protection fills
Putting 400 has main resistor unit 401, breaker 402 and reactor 403.Breaker 402 is in parallel with main resistor unit 401
Connection forms the first parallel circuit, and the first parallel circuit is further connected in series with reactor 403.The letter of breaker 402
Number receiving terminal couples with the short-circuit detecting device of DC transmission system.Fig. 6 short-circuit protection 400 can be with alternate figures 2
Short-circuit protection 400 and be connected between the earthing pole of current conversion station and the earth point of DC transmission system.
In this embodiment, it is not received by breaker 402 and comes from the instruction direct current transportation of short-circuit detecting device
In the case of the signal of short trouble in system, breaker 402 is remained closed to bypass main resistor unit 401.So, exist
In the case of phase ground short circuit failure does not occur, the electric current on earthing pole flows only through reactor 403, and main resistor unit
Almost no electric current flows through in 401.This effectively avoids main resistor unit 401 in the normal work of DC transmission system
Cause power attenuation.On the other hand, once breaker 402 receives the instruction DC transmission system for coming from short-circuit detecting device
In short trouble signal, breaker 402 is just controlled as disconnecting automatically, so as to rapidly access main resistor unit 401
Current path between the earthing pole and earth point of current conversion station, makes main resistor unit 401 quickly consume fault current.
Fig. 7 is the schematic diagram according to the short-circuit protection of another embodiment of the present disclosure.In the figure 7, short-circuit protection fills
Putting 400 also has main resistor unit 401, breaker 402 and a reactor 403, and the signal receiving end of breaker 402 also with
The short-circuit detecting device coupling of DC transmission system.It is but in the embodiment shown in figure, main different from Fig. 6 embodiment
Resistor unit 401 is connected in series with the breaker 402, and this is connected in series and then is connected in parallel with reactor 403.Fig. 7's
Short-circuit protection 400 can be connected to earthing pole and the direct current transportation of current conversion station with the short-circuit protection 400 in alternate figures 2
Between the earth point of system.
Other Fig. 7 is also differ in that relative to Fig. 6 embodiment, is not received by and is come from breaker 402
In the case of the signal of short trouble in the instruction DC transmission system of short-circuit detecting device, breaker 402 remains open
To bypass main resistor unit 401.In this way, in the state of no generation phase ground short circuit failure, main electricity can be avoided
Resistance device unit 401 causes power attenuation in the normal work of DC transmission system.On the other hand, received in breaker 402
In the case of the signal for coming from the short trouble in the instruction DC transmission system of short-circuit detecting device, breaker 402 is automatic
Closure, so that the current path for rapidly accessing main resistor unit 401 between the earthing pole of current conversion station and earth point is so that event
Barrier electric current flows through main resistor unit 401, main resistor unit 401 is quickly consumed fault current.Reactor 403 then connects all the time
Enter in the current path between the earthing pole and earth point of current conversion station, so as to delay fault current reach peak-peak when
Between.
Fig. 8 is the schematic diagram according to the short-circuit protection of another embodiment of the present disclosure.It can be seen that Fig. 8 implementation
Mode is that a booster resistor unit 404 has been further added by the basis of the structure of Fig. 6 short-circuit protection.Additional resistance
Device unit 404 is connected in the first parallel circuit (being formed by main resistor unit 401 is in parallel with breaker 402) and reactor in parallel
403 both ends being connected in series.Fig. 8 short-circuit protection 400 can be connected with the short-circuit protection 400 in alternate figures 2
Between the earthing pole of current conversion station and the earth point of DC transmission system.Booster resistor unit 404 also can by heat and
Decay current.The setting of booster resistor unit 404 makes it possible to more neatly adjust the decay event of short-circuit protection 400
The balance between power attenuation in the case of the speed and reduction normal current of barrier electric current.
In the short-circuit protection 400 of examples above embodiment, total resistance value of main resistor unit 401 is determined
Determine short-circuit protection 400 to consume or the speed of wear-out failure electric current.Therefore, the short-circuit protection of each embodiment of the above
Total resistance value of main resistor unit 401 in 400 can determine according at least one in the following：At least one change of current
The desired die-away time for the fault current on earthing pole stood, and (this determines the size of electric current transmitted of DC transmission system
The size of fault current that may occur is determined).In the short-circuit protection 400 with reactor 403, main resistor unit
401 total resistance value determines always according to the induction reactance value size of reactor 403, because the induction reactance value size of reactor 403
Influence flows through the size of the fault current of main resistor unit 401.In general, the all-in resistance of main resistor unit 401 is for example
5 ohm should be more than, in order to relative to shortening decay when being not provided with short-circuit protection 400 at double (or even decades of times)
Time needed for fault current.Have and main resistor unit 401 or booster resistor unit in short-circuit protection 400
In the case of 404 reactors 403 being connected in parallel, the all-in resistance of main resistor unit 401 or booster resistor unit 404 is favourable
Ground can be higher than the 30% of induction reactance value of the reactor 403 in the case where flowing through 50Hz electric currents.
Although figure 2 illustrates only include a power transmission current conversion station 100 and a direct current transportation by electric current conversion station 200
System (double ended system) it should be appreciated that this is merely exemplary and be not intended to limit the scope of the present disclosure.According to the disclosure
The short-circuit protection 400 of each embodiment can be used for including the more than one DC power transmission system by electric current conversion station 200
Unite (multi-terminal system).For example, have a power transmission current conversion station 100 and three direct currents by electric current conversion station 200 defeated shown in Fig. 9
It is each by electric current conversion station 200 and the earthing pole (neutral pole) 106,206 of power transmission current conversion station 100 in electric system (multi-terminal system)
Between can be by being linked together more with wire 300.In such a case, it is possible to only by one according to more than the disclosure each
The short-circuit protection 400 of embodiment or the earthing or grounding means including the short-circuit protection 400 are connected to any of wire 300
Between position and the earth point of DC transmission system.So, the earthing pole of each current conversion station is all connected to by wire 300
Short-circuit protection 400 simultaneously and then is connected to greatly, so as to be flowed through by a short-circuit protection 400 to decay
Fault current on the earthing pole of each current conversion station of the DC transmission system.
The short-circuit protection 400 with reactor 403 in each embodiment of the disclosure with multiple for changing
The DC transmission system (multi-terminal system) at stream station is particularly advantageous.Specifically, due to the short-circuit protection near earth point
Reactor 403 is provided in device 400, and the reactor 403 in the short-circuit protection 400 is connected to by wire 300
The earthing pole (neutral pole) of each current conversion station, therefore the reactor 403 in a short-circuit protection 400 just can be system
In the earthing pole of each current conversion station induction reactance is provided, surge current on the earthing pole of each current conversion station is appeared in buffering.This
Sample, without being that reactor is provided separately in the earthing pole of each current conversion station again.This, which is not only limited, reduces system cost, while also changes
The dynamic property of whole system has been apt to it, because the quantity of total reactor in system is reduced and short-circuit protection 400
In reactor 403 be not present in normal current path.
Although the earthing pole of each current conversion station in each embodiment described above in DC transmission system is by leading
Line 300 is grounded after interconnecting from an earth point, it is to be understood that, can not also be by directly in some other embodiments
The earthing pole of each current conversion station in stream transmission system is interconnected by wire 300, but by the earthing pole of each current conversion station
(neutral pole) is directly grounded respectively.In such a case, it is possible to the earthing pole (neutral pole) in each current conversion station connects with respective
One is connected between place respectively to protect according to the short-circuit protection 400 of more than disclosure each embodiment or with the short circuit
The earthing or grounding means of protection unit 400, to be respectively that each current conversion station provides short-circuit protection.
For example, in the both-end DC transmission system shown in Figure 10, the earthing pole (neutral pole) 106 of power transmission current conversion station 100
It is not connected with the earthing pole (neutral pole) 206 by electric current conversion station 200 by wire directly, but connecing in power transmission current conversion station 100
A short-circuit protection 400 is connected at earth polar 106 and the short-circuit protection 400 is grounded.Moreover, by electric current conversion station
A short-circuit protection 400 is connected at 200 earthing pole 206 and the short-circuit protection 400 is also grounded.So, when
When ground short circuit failure occurring at any current conversion station, caused fault current it is inevitable also by with the direct phase of corresponding current conversion station
Short-circuit protection 400 even and form loop, so as to being realized by the corresponding short-circuit protection 400 to fault current
Decay.
Although in the DC transmission system of each embodiment described above, each current conversion station is configured with just
The bipole arrangement of pole, two output stages of negative pole and an earthing pole (neutral pole), it is to be understood that, according to each reality of the disclosure
The short-circuit protection 400 for applying mode is also applied for the current conversion station of monopolar configuration (monopole current conversion station) and DC transmission system.
In monopolar configuration, each current conversion station only provides an output stage (as negative or positive electrode) and an earthing pole.In such case
Under, can according to the short-circuit protection 400 of each embodiment of the disclosure or the earthing or grounding means including the short-circuit protection 400
To be connected between the earthing pole of the monopolar configuration and the earth point of DC transmission system, and can equally realize above with respect to
The advantages of each embodiment described by bipole arrangement.
It should be noted that, providing for the above embodiments is used to describe principle of the present utility model, rather than limits it
Scope；And it should be appreciated that modification can be taken in the case where not departing from spirit and scope of the present utility model and is become
Change, to this skilled person will readily understand that.These modifications and variations are considered as in the utility model and appended power
Within the scope of profit requires.The scope of protection of the utility model is defined by the appended claims.In addition, in the claims
Any reference should not be construed as limitations on claims.The use of verb " comprising " and its variant is not precluded from
Element or step beyond existing described in claim.Indefinite article "a" or "an" before element or step does not exclude the presence of
Multiple such element or steps.
Claims (22)
1. a kind of short-circuit protection (400), is configured as coupling with DC transmission system, the DC transmission system is included extremely
A few current conversion station, the current conversion station are configured as performing the conversion between alternating electromotive force and direct current power, it is characterised in that institute
Stating short-circuit protection (400) includes：
Main resistor unit (401), the main resistor unit (401) include at least one resistor；
Wherein described main resistor unit (401) can be coupling at least one current conversion station earthing pole and the direct current it is defeated
Between the earth point of electric system, at least one change of current is appeared in the short trouble of the DC transmission system with consumption
The fault current on earthing pole stood.
2. short-circuit protection according to claim 1, it is characterised in that the current conversion station is bipolar current conversion station, and it is wrapped
Include positive pole, negative pole and the neutral pole for being coupled to the positive pole and negative pole, earthing pole of the neutral pole as the current conversion station.
3. short-circuit protection according to claim 1, it is characterised in that the current conversion station is monopole current conversion station, and it is wrapped
Negative or positive electrode is included, and including earthing pole.
4. short-circuit protection (400) according to claim 1, it is characterised in that the short-circuit protection (400) is also
Including breaker (402), the breaker (402) is connected in parallel at least one described with the main resistor unit (401)
Between the earth point of the earthing pole of current conversion station and the DC transmission system,
And the signal receiving end of the breaker (402) can couple with the short-circuit detecting device of the DC transmission system,
So that it is not received by the breaker (402) in the instruction DC transmission system for coming from the short-circuit detecting device
Short trouble signal in the case of the breaker (402) remain closed to bypass the main resistor unit (401), and
And receive the short circuit in coming from the instruction DC transmission system of the short-circuit detecting device in the breaker (402)
The breaker (402) disconnects in the case of the signal of failure.
5. short-circuit protection (400) according to claim 1, it is characterised in that the short-circuit protection (400) is also
Including reactor (403), the reactor (403) is connected in series at least one described with the main resistor unit (401)
Between the earth point of the earthing pole of current conversion station and the DC transmission system.
6. short-circuit protection (400) according to claim 1, it is characterised in that the short-circuit protection (400) is also
Including breaker (402) and reactor (403),
The breaker (402) and the main resistor unit (401) are connected in parallel to form the first parallel circuit, and described the
One parallel circuit be further connected in series in the reactor (403) earthing pole of at least one current conversion station with it is described straight
Between the earth point for flowing transmission system, and
The signal receiving end of the breaker (402) can couple with the short-circuit detecting device of the DC transmission system so that
It is not received by the breaker (402) short in the instruction DC transmission system for coming from the short-circuit detecting device
The breaker (402) is remained closed to bypass the main resistor unit (401) in the case of the signal of road failure, and
The breaker (402) receives the short trouble come from the instruction DC transmission system of the short-circuit detecting device
Signal in the case of the breaker (402) disconnect.
7. short-circuit protection (400) according to claim 6, it is characterised in that the short-circuit protection (400) is also
Including booster resistor unit (404), the booster resistor unit (404) is connected in first parallel circuit and institute in parallel
State the both ends being connected in series of reactor (403).
8. short-circuit protection (400) according to claim 1, it is characterised in that the short-circuit protection (400) is also
Including reactor (403), the reactor (403) is connected in parallel at least one described with the main resistor unit (401)
Between the earth point of the earthing pole of current conversion station and the DC transmission system.
9. short-circuit protection (400) according to claim 8, it is characterised in that the short-circuit protection (400) is also
Including breaker (402), the breaker (402) and the main resistor unit (401) be connected in series and with the reactor
(403) it is connected in parallel；
And the signal receiving end of the breaker (402) can couple with the short-circuit detecting device of the DC transmission system,
So that it is not received by the breaker (402) in the instruction DC transmission system for coming from the short-circuit detecting device
Short trouble signal in the case of the breaker (402) remain open, and the breaker (402) receive come
From the open circuit in the case of the signal for indicating the short trouble in the DC transmission system of the short-circuit detecting device
The fault current that device (402) is close to allow for appearing on the earthing pole of at least one current conversion station flows through the main resistor
Unit (401).
10. the short-circuit protection (400) according to any one of claim 1-4, it is characterised in that the main resistor
Unit (401) has the total resistance value according to determined by least one in the following：The earthing pole of at least one current conversion station
On fault current desired die-away time, and the size of electric current that the DC transmission system is transmitted.
11. the short-circuit protection (400) according to any one of claim 5-9, it is characterised in that the main resistor
Unit (401) has the total resistance value according to determined by least one in the following：The earthing pole of at least one current conversion station
On fault current desired die-away time, the size for the electric current that the DC transmission system is transmitted, and the reactor
(403) induction reactance value size.
12. the short-circuit protection (400) according to any one of claim 1-7, it is characterised in that the main resistor
The all-in resistance of unit (401) is more than 5 ohm.
13. the short-circuit protection (400) according to any one of claim 8-9, it is characterised in that the main resistor
The all-in resistance of unit (401) is higher than the 30% of induction reactance value of the reactor (403) in the case where flowing through 50Hz electric currents.
14. short-circuit protection (400) according to claim 7, it is characterised in that the booster resistor unit
(404) all-in resistance is higher than the 30% of induction reactance value of the reactor (403) in the case where flowing through 50Hz electric currents.
15. a kind of earthing or grounding means, it is characterised in that including the short-circuit protection dress according to any one of claim 1-14
Put (400).
16. earthing or grounding means according to claim 15, it is characterised in that the earthing or grounding means also includes earthing pole and ground connection
Bus, the short-circuit protection (400) is connected between the earthing pole of the earthing or grounding means and the earth bus, described to connect
Ground bus is connectable to the earthing pole of at least one current conversion station of DC transmission system, and the current conversion station is configured as performing friendship
Flow the conversion between electric power and direct current power.
17. a kind of current conversion station, it is configured as alternating electromotive force being converted to direct current power or direct current power is converted into alternating electromotive force
And there is earthing pole, it is characterised in that the current conversion station includes the short circuit guarantor according to any one of claim 1-14
Protection unit (400), the short-circuit protection (400) are connected to the earthing pole of the current conversion station and the DC transmission system
Between earth point.
18. current conversion station according to claim 17, it is characterised in that the current conversion station is bipolar current conversion station, and it is included just
Pole, negative pole and the neutral pole for being coupled to the positive pole and negative pole, earthing pole of the neutral pole as the current conversion station.
19. a kind of DC transmission system, including power transmission current conversion station (100) and at least one by electric current conversion station (200), the power transmission
Current conversion station (100) is configured as alternating electromotive force being converted to direct current power, and it is described by electric current conversion station (200) be configured as by
Direct current power is converted to alternating electromotive force, it is characterised in that the DC transmission system also includes at least one according to claim
Short-circuit protection (400) described in any one of 1-14, the short-circuit protection (400) are connected to the power transmission change of current
Stand (100) between at least one earthing pole in by electric current conversion station (200) and the earth point of the DC transmission system.
20. a kind of DC transmission system, including power transmission current conversion station (100) and at least one by electric current conversion station (200), the power transmission
Current conversion station (100) is configured as alternating electromotive force being converted to direct current power, and it is described by electric current conversion station (200) be configured as by
Direct current power is converted to alternating electromotive force, it is characterised in that the DC transmission system also includes at least one according to claim
Earthing or grounding means described in any one of 15-16, the earthing or grounding means are connected to the power transmission current conversion station (100) and by the electric changes of current
Stand between the earth point of at least one earthing pole and the DC transmission system in (200).
21. DC transmission system according to claim 20, it is characterised in that the ground connection of the power transmission current conversion station (100)
Pole (106) and each earthing pole (206) by electric current conversion station (200) connect each other by wire (300), at least one described to connect
Ground device is connected between the wire (300) and the earth point of the DC transmission system.
22. DC transmission system according to claim 20, it is characterised in that the ground connection of the power transmission current conversion station (100)
Pole (106) and each earthing pole (206) by electric current conversion station (200) connect a single earthing or grounding means respectively, each
The earthing or grounding means is connected to corresponding power transmission current conversion station (100) or the earthing pole (106,206) by electric current conversion station (200)
Between the earth point of the DC transmission system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720572893.6U CN206790085U (en) | 2017-05-22 | 2017-05-22 | Short-circuit protection, earthing or grounding means, current conversion station and DC transmission system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720572893.6U CN206790085U (en) | 2017-05-22 | 2017-05-22 | Short-circuit protection, earthing or grounding means, current conversion station and DC transmission system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019020195A1 (en) * | 2017-07-28 | 2019-01-31 | Siemens Aktiengesellschaft | Impedor for ac fault current handling in an hvdc transmission converter |
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2017
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019020195A1 (en) * | 2017-07-28 | 2019-01-31 | Siemens Aktiengesellschaft | Impedor for ac fault current handling in an hvdc transmission converter |
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