CN109742739A - A kind of novel multiport current-limiting type dc circuit breaker and its control method - Google Patents
A kind of novel multiport current-limiting type dc circuit breaker and its control method Download PDFInfo
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Abstract
The present invention provides a kind of novel multiport current-limiting type dc circuit breaker (multi-port current limiting circuit breaker, Mp-CLCB) topology and its control method, topological structure are made of through-flow branch, current limliting branch, capacitor precharge branch, main circuit breaker and energy transfer branch.A plurality of DC line is protected using single main circuit breaker; the thyristor for using through-current capability big is as the control unit between main circuit breaker and DC line; it is current limliting branch capacitor charging that capacitor precharge branch, which makes full use of direct current system, and energy transfer branch is for shielding current-limiting reactor.The present invention provides the control method of multiport dc circuit breaker, be divided into the route where multiport dc circuit breaker operate normally, detect carry out open circuit after a route DC Line Fault, faulty line electric current carries out three kinds of situations of energy consumption and realizes novel multiport current-limiting type dc circuit breaker to control after falling to zero.
Description
Technical field
The present invention relates to power electronics fields, and in particular to a kind of novel multiport current-limiting type dc circuit breaker and control
Method processed.
Background technique
The DC grid technology of high-voltage large-capacity is the important ring of following building smart grid and global energy internet
Section.Flexible DC transmission technology based on modularization multi-level converter (modular multilevel converter, MMC)
Convenient for constructing DC grid, thus become a new expectation of power industry circle.Zhangbei County's DC grid that China will be built up
It is that first DC grid engineering is real in the world using half-bridge submodule (half bridge sub module) plus overhead line scheme
It tramples.There is apparent Technological Economy sexual clorminance using overhead line, but following problem is exactly that DC side probability of malfunction is high,
Do not have the characteristics of DC side fault clearance ability in conjunction with half-bridge submodule, needs using dc circuit breaker disengagement failure electric current.
With the raising of DC grid capacity, fault current can reach the resistant to flow limit of power electronic devices in a shorter time, this requirement
Failure is cut off within the faster time, high challenge is brought to fault detection speed and dc circuit breaker rupturing capacity.
As DC grid endpoint increases, become the mainstream scheme of DC grid protection using DCCB excision failure.Due to
DC Line Fault transient process is quickly grown, and is easy to produce overcurrent, and DCCB needs higher rated current and faster disjunction speed
Degree.Solid circuit breaker (solid state circuit breaker, SSCB) cut-off velocity is fast, but logical when power grid normal operation
State loss be up to lost with voltage class inverter 30%, mechanical breaker (mechanical circuit breaker,
MCB) on-state loss is very low, but the disengagement failure time is longer.Hybrid circuit breaker (hybrid circuit breaker, HCB)
The advantages of combining SSCB and MCB.
But HCB uses a large amount of power electronic devices, to reduce cost, the DCCB quilt of the main breaking branch of a plurality of line sharing
It proposes, cost can be greatly reduced on the basis of reaching identical breaking capability.Existing literature proposes a kind of multi-line direct current interruption
Device takes full advantage of hybrid circuit breaker structure, reduces power electronic devices input quantity.But the fault current before open circuit
Faulty line lower bridge arm is flowed through, lower bridge arm LCS bears the maximum current after failure occurs, and generates overcurrent to power electronic devices
Impact.
Summary of the invention
In order to overcome, the above-mentioned energy consumption of arrester in the prior art demand is big and breaker manufacturing cost is high and equipment volume
Big problem, the present invention provide a kind of novel multiport current-limiting type dc circuit breaker and its control method, novel multiport current limliting
Formula dc circuit breaker includes through-flow branch, current limliting branch, capacitor precharge branch, main circuit breaker and energy transfer branch.It is through-flow
Branch for realizing the conducting of DC line steady-state current when DC line operates normally, and is detecting DC line hair
Fault current is transferred to main circuit breaker branch after raw failure；Main circuit breaker, for carrying the failure electricity of through-flow branch transfer
Stream, and cut off fault current by arrester；Current limliting branch, for inhibiting the rising of fault current in failure early period of origination；
Capacitor precharge branch is current limliting branch capacitor charging for utilizing direct current system power supply under normal operating conditions；Energy turns
Branch is moved, for shielding direct current reactance energy, auxiliary arrester realizes the rapid decay of fault current.It is disconnected to be divided into multiport direct current
Route where the device of road operates normally, detect a route DC Line Fault after carry out open circuit, faulty line electric current falls to zero
After carry out three kinds of situations of energy consumption and realize novel multiport current-limiting type dc circuit breaker to control, novel multiport current-limiting type direct current is disconnected
Road device uses half control type device, and logic is simple, and economy is high, and control ability is strong.
In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical scheme that:
On the one hand, the present invention provides a kind of novel multiport current-limiting type dc circuit breaker, comprising:
Through-flow branch for realizing the conducting of DC line steady-state current when DC line operates normally, and is detecting
Fault current is transferred to main circuit breaker branch after the failure occurred to DC line；
Main circuit breaker for carrying the fault current of through-flow branch transfer, and is cut off fault current by arrester；
Current limliting branch, for inhibiting the rising of fault current in failure early period of origination；
Capacitor precharge branch, for being filled under normal operating conditions using direct current system power supply for current limliting branch capacitor
Electricity；
Energy transfer branch, for shielding direct current reactance energy, auxiliary arrester realizes the rapid decay of fault current.
Pass through supper-fast mechanical switch UFD between the through-flow branch and other branches and connects with supper-fast mechanical switch
Thyristor be connected；
The current limliting branch includes thyristor controlled series compensation Ta, thyristor controlled series compensation Tb、Tg1With recharged capacitance C1Series arm,
Thyristor controlled series compensation TcWith current-limiting inductance LFCLSeries arm；
The thyristor controlled series compensation TaFor shifting fault current rapidly, guarantee that UFD is reliably opened under zero current；
The thyristor controlled series compensation Tb、Tg1With recharged capacitance C1Series arm, on the one hand guarantee TaReliable turn-off, it is another
The reverse charging of aspect capacitor can store portion of energy and fault current is inhibited to rise；
The thyristor controlled series compensation TcWith current-limiting inductance LFCLSeries arm, for sealing in current-limiting inductance in fault loop
To inhibit fault current to rise；
The recharged capacitance is by resistance Rg, capacitor CgWith thyristor TgIt is composed in series；
The energy transfer branch includes thyristor Ta, recharged capacitance C and energy consumption resistor R；
The thyristor Ta, for direct current reactance to be bypassed；
The recharged capacitance C discharge process is thyristor TaThe back-pressure of reliable turn-off is provided, reverse charging process is quick
Absorb direct current reactance energy；
The energy consumption resistor R utilizes thyristor and commutation capacitor cooperation investment energy-absorbing capacitor and energy consumption resistor, steady-state loss
It is low, arrester energy consumption demand is effectively reduced.
On the other hand, the DC line where novel multiport current-limiting type dc circuit breaker is operated normally or is detected novel
Before the failure that DC line where multiport current-limiting type dc circuit breaker occurs, the present invention provides a kind of novel multiports to limit
The control method of streaming dc circuit breaker, comprising:
All IGBT conducting in through-flow branch, steady-state current or fault current flow through through-flow branch；
Capacitor precharge branch thyristor TgWith current limliting branch Tg1Conducting, DC grid give capacitor preliminary filling through bridge arm diode
Electricity.
In another aspect, after the failure that the DC line where detecting novel multiport current-limiting type dc circuit breaker occurs,
The present invention also provides the control methods of another novel multiport current-limiting type dc circuit breaker, comprising:
Protective device issues instruction, and bridge arm thyristor is connected in all IGBT shutdown of through-flow branch where faulty line
T1', main circuit breaker IGBT and current limliting branch thyristor Ta, the LCS module of the through-flow branch of faulty line is turned off, and give fault wire
The through-flow branch and non-fault line bridge arm UFD on road issue separating brake instruction；
Supper-fast mechanical switch completes disjunction, gives TbAnd TcContinuity signal, TbIt is connected immediately due to bearing positive pressure, TaStart
Bear back-pressure, capacitor C1Start to discharge.TaIt can be complete switched off after bearing a period of time back-pressure；
Capacitance voltage uC=0, subsequent C1Reverse charging, then TcIt is connected because bearing positive pressure.Work as C1Both end voltage is higher than system
When voltage, C1Middle electric current starts to reduce.t4Moment capacitance current is reduced to zero, current-limiting inductance LFCLIt is put into fault loop completely；
It is first turned off main circuit breaker IGBT, and conducts energy shifts branch T1、Td, reactance is quickly bypassed, lightning arrestor movement,
Fault current is gradually reduced to 0.
In another aspect, the present invention is also after a faulty line electric current included by multiport dc circuit breaker falls to zero
The control method of another novel multiport current-limiting type dc circuit breaker is provided, comprising:
Arrester all absorbs dump energy, and line current falls to 0, and T is connectedb, capacitor C starts to discharge, TaIt bears anti-
Pressure, is turned off after a period of time.
TaShutdown, direct current reactance and R, C constitute circuit, to capacitor charging, and through conductive discharge.Since Absorption Capacitance is deposited
In energy fast transfer.
Electric current in direct current reactance falls to 0, thyristor T1And T1' shutdown, direct current reactance energy all dissipates, hereafter, electric
Appearance consumes energy through conductive discharge.By UFDi' (i=2,3 ..., n) combined floodgate.
Compared with the immediate prior art, technical solution provided by the invention is had the advantages that
Novel multiport current-limiting type dc circuit breaker provided by the invention and its control method, novel multiport current-limiting type are straight
Flowing breaker includes through-flow branch, current limliting branch, capacitor precharge branch, main circuit breaker and energy transfer branch.Through-flow branch,
For realizing the conducting of DC line steady-state current when DC line operates normally, and in the event for detecting that DC line occurs
Fault current is transferred to main circuit breaker branch after barrier；Main circuit breaker for carrying the fault current of through-flow branch transfer, and leads to
Arrester is crossed to cut off fault current；Current limliting branch, for inhibiting the rising of fault current in failure early period of origination；Capacitor preliminary filling
Electric branch is current limliting branch capacitor charging for utilizing direct current system power supply under normal operating conditions；Energy transfer branch is used
In shielding direct current reactance energy, auxiliary arrester realizes the rapid decay of fault current.
The control method of novel multiport current-limiting type dc circuit breaker provided by the invention is divided into multiport dc circuit breaker
The route at place operates normally, detect a route DC Line Fault after carry out that open circuit, that faulty line electric current falls to zero is laggard
Row three kinds of situations of energy consumption, which realize novel multiport current-limiting type dc circuit breaker, to be controlled, novel multiport current-limiting type dc circuit breaker
Using half control type device, logic is simple, and economy is high, and control ability is strong；
In of the invention through-flow branch play conducting direct current route steady-state current, reduce DC line loss and save at
This effect, current limliting branch play the role of that fault current is inhibited to rise, and energy transfer branch plays bypass direct current reactance, reduce
The effect of arrester energy consumption demand；
Technical solution provided by the invention takes full advantage of main circuit breaker, can protect a plurality of straight at same DC bus
Flow Line has saved breaker cost of investment；
Technical solution provided by the invention is normally transported in the DC line where novel multiport current-limiting type dc circuit breaker
Before the failure that DC line where going or detecting novel multiport current-limiting type dc circuit breaker occurs, electric current flows through through-flow branch
Road, through-flow branch have a lesser loss resistance, better economy when stable state；
Technical solution provided by the invention seals in current-limiting reactor during fault current rises, and reduces the upper of fault current
The rate of liter, and reduce the rupturing capacity of breaker；
Technical solution provided by the invention makes full use of energy transfer branch when fault current flows through arrester, will be straight
The anti-energy barrier of galvanic electricity reduces the energy consumption demand of arrester；
Technical solution provided by the invention effectively save can be invested using the half control type device of low cost.
Detailed description of the invention
Fig. 1 is novel multiport current-limiting type dc circuit breaker structure chart in the embodiment of the present invention 1；
Fig. 2 is that the electric current that route operates normally in the embodiment of the present invention 2 flows through path schematic diagram；
Fig. 3 is that DC line fault electric current flows through path schematic diagram before detecting failure in the embodiment of the present invention 3；
Fig. 4 is the circulation path signal of DC line fault electric current in S101 after detecting failure in the embodiment of the present invention 4
Figure.
Fig. 5 is the circulation path signal of DC line fault electric current in S102 after detecting failure in the embodiment of the present invention 4
Figure.
Fig. 6 is the circulation path signal of DC line fault electric current in S103 after detecting failure in the embodiment of the present invention 4
Figure.
Fig. 7 is the circulation path signal of DC line fault electric current in S104 after detecting failure in the embodiment of the present invention 4
Figure.
Fig. 8 is the circulation path signal of DC line fault electric current in S105 after detecting failure in the embodiment of the present invention 4
Figure.
Fig. 9 is the circulation path signal of DC line fault electric current in S201 after detecting failure in the embodiment of the present invention 5
Figure.
Figure 10 is the circulation path signal of DC line fault electric current in S202 after detecting failure in the embodiment of the present invention 5
Figure.
Figure 11 is the circulation path signal of DC line fault electric current in S203 after detecting failure in the embodiment of the present invention 5
Figure.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
Embodiment 1
The embodiment of the present invention 1 provides a kind of novel multiport current-limiting type dc circuit breaker, specifically includes through-flow branch, current limliting
Branch, capacitor precharge branch, main circuit breaker and energy transfer branch, the function of each branch are as follows:
Through-flow branch therein, for realizing the conducting of DC line steady-state current when DC line operates normally, and
Fault current is transferred to main circuit breaker branch after detecting the failure that DC line occurs；
Main circuit breaker therein for carrying the fault current of through-flow branch transfer, and passes through arrester for fault current
Cutting；
Current limliting branch therein, for inhibiting the rising of fault current in failure early period of origination；
Capacitor precharge branch therein, for electric for current limliting branch using direct current system power supply under normal operating conditions
Capacity charge；
Energy transfer branch therein, for shielding direct current reactance energy, auxiliary arrester realizes the quick of fault current
Decaying.
The novel multiport current-limiting type dc circuit breaker structural schematic diagram that the embodiment of the present invention 1 provides is as shown in Figure 1.
Pass through supper-fast mechanical switch UFD between above-mentioned through-flow branch and other branches and connects with supper-fast mechanical switch
Thyristor be connected；
Above-mentioned current limliting branch includes thyristor controlled series compensation Ta, thyristor controlled series compensation Tb、Tg1With recharged capacitance C1Series arm,
Thyristor controlled series compensation TcWith current-limiting inductance LFCLSeries arm；
Above-mentioned thyristor controlled series compensation TaFor shifting fault current rapidly, guarantee that UFD is reliably opened under zero current；
Above-mentioned thyristor controlled series compensation Tb、Tg1With recharged capacitance C1Series arm, on the one hand guarantee TaReliable turn-off, it is another
The reverse charging of aspect capacitor can store portion of energy and fault current is inhibited to rise；
Above-mentioned thyristor controlled series compensation TcWith current-limiting inductance LFCLSeries arm, for sealing in current-limiting inductance in fault loop
To inhibit fault current to rise；
Above-mentioned recharged capacitance is by resistance Rg, capacitor CgWith thyristor TgIt is composed in series；
Above-mentioned energy transfer branch includes thyristor Ta, recharged capacitance C and energy consumption resistor R；
Above-mentioned thyristor Ta, for direct current reactance to be bypassed；
Above-mentioned recharged capacitance C discharge process is thyristor TaThe back-pressure of reliable turn-off is provided, reverse charging process is quick
Absorb direct current reactance energy；
Above-mentioned energy consumption resistor R utilizes thyristor and commutation capacitor cooperation investment energy-absorbing capacitor and energy consumption resistor, steady-state loss
It is low, arrester energy consumption demand is effectively reduced.
Embodiment 2
The embodiment of the present invention 2 provides a kind of control method of novel multiport current-limiting type dc circuit breaker, detailed process
It is as follows:
Under DC line normal operation where novel multiport current-limiting type dc circuit breaker, electric current is shifted in branch
Thyristor is turned off, and current limliting branch is out of service, the IGBT in through-flow branch1And IGBT2Conducting, steady-state current flow through through-flow branch
Road, when DC line operates normally steady-state current to flow through path schematic diagram as shown in Figure 2.
Embodiment 3
The control method for the novel multiport current-limiting type dc circuit breaker that the embodiment of the present invention 3 provides, detailed process is as follows:
Before the failure that DC line where detecting novel multiport current-limiting type dc circuit breaker occurs, in through-flow branch
IGBT1And IGBT2Conducting, fault current flows through through-flow branch, and detect DC line fault electric current before failure flows through path
Schematic diagram is as shown in Figure 3.
Embodiment 4
The control method for the novel multiport current-limiting type dc circuit breaker that the embodiment of the present invention 4 provides, suitable for detecting
After the failure that DC line where novel multiport current-limiting type dc circuit breaker occurs, detailed process is as follows:
S101: protective device issues instruction, and bridge arm crystalline substance lock is connected in all IGBT shutdown of through-flow branch where faulty line
Pipe T1', main circuit breaker IGBT and current limliting branch thyristor Ta, the LCS module of the through-flow branch of faulty line is turned off, and give failure
Route is through-flow, and branch UFD and non-fault line bridge arm UFD ' issues separating brake instruction, circulation path schematic diagram such as Fig. 4 of fault current
It is shown；
S102:UFD1 completes disjunction, gives TbAnd TcContinuity signal, TbIt is connected immediately due to bearing positive pressure, TaStart to bear anti-
Pressure, capacitor C1Start to discharge, TaIt can be complete switched off after bearing a period of time back-pressure, circulation path schematic diagram such as Fig. 5 of fault current
It is shown；
S103: capacitance voltage uC=0, subsequent C1Reverse charging, then TcIt is connected because bearing positive pressure.Work as C1Both end voltage is high
When system voltage, C1Middle electric current starts to reduce.
S104: capacitance current is reduced to zero, current-limiting inductance LFCLIt is put into fault loop completely, the logical circulation road of fault current
Diameter schematic diagram is as shown in Figure 6；
S105: shutdown main circuit breaker IGBT, and conducts energy shifts branch T1、Td, reactance is quickly bypassed, arrester is dynamic
Make, fault current is gradually reduced to 0, and the circulation path schematic diagram of fault current is as shown in Figure 7；
Embodiment 5
The control method for the novel multiport current-limiting type dc circuit breaker that the embodiment of the present invention 5 provides is suitable for multiport
After a faulty line electric current included by dc circuit breaker falls to zero, detailed process is as follows:
S201: arrester all absorbs dump energy, and line current falls to 0, and T is connectedb, capacitor C starts to discharge, Ta
Back-pressure is born, is turned off after a period of time.
S202:TaShutdown, direct current reactance and R, C constitute circuit, to capacitor charging, and through conductive discharge.Due to absorbing electricity
It stores, energy fast transfer.
S203: the electric current in direct current reactance falls to 0, thyristor T1And T1' shutdown, all dissipation of direct current reactance energy, this
Afterwards, capacitor consumes energy through conductive discharge.By UFDi' (i=2,3 ..., n) combined floodgate.
For convenience of description, each section of apparatus described above is divided into various modules with function or unit describes respectively.
Certainly, each module or the function of unit can be realized in same or multiple softwares or hardware when implementing the application.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, institute
The those of ordinary skill in category field can still modify to a specific embodiment of the invention referring to above-described embodiment or
Equivalent replacement, these are applying for this pending hair without departing from any modification of spirit and scope of the invention or equivalent replacement
Within bright claims.
Claims (8)
1. a kind of novel multiport current-limiting type dc circuit breaker characterized by comprising
Through-flow branch, for realizing the conducting of DC line steady-state current when DC line operates normally, and it is straight detecting
Fault current is transferred to main circuit breaker branch after the failure that Flow Line occurs；
Main circuit breaker for carrying the fault current of through-flow branch transfer, and is cut off fault current by arrester；
Current limliting branch, for inhibiting the rising of fault current in failure early period of origination；
Capacitor precharge branch is current limliting branch capacitor charging for utilizing direct current system power supply under normal operating conditions；
Energy transfer branch, for shielding direct current reactance energy, auxiliary arrester realizes the rapid decay of fault current.
2. novel multiport current-limiting type dc circuit breaker according to claim 1, which is characterized in that the through-flow branch and
It is connected between other branches by supper-fast mechanical switch UFD and with the concatenated thyristor of supper-fast mechanical switch.
3. novel multiport current-limiting type dc circuit breaker according to claim 1, which is characterized in that the current limliting branch packet
Include thyristor controlled series compensation Ta, thyristor controlled series compensation Tb、Tg1With recharged capacitance C1Series arm, thyristor controlled series compensation TcAnd current-limiting inductance
LFCLSeries arm；
The thyristor controlled series compensation TaFor shifting fault current rapidly, guarantee that UFD is reliably opened under zero current；
The thyristor controlled series compensation Tb、Tg1With recharged capacitance C1Series arm, on the one hand guarantee TaReliable turn-off, on the other hand
The reverse charging of capacitor can store portion of energy and fault current is inhibited to rise；
The thyristor controlled series compensation TcWith current-limiting inductance LFCLSeries arm, for current-limiting inductance being sealed in fault loop to inhibit
Fault current rises.
4. novel multiport current-limiting type dc circuit breaker according to claim 1, which is characterized in that the recharged capacitance
By resistance Rg, capacitor CgWith thyristor TgIt is composed in series.
5. novel multiport current-limiting type dc circuit breaker according to claim 1, which is characterized in that the energy transfer branch
Road includes thyristor Ta, recharged capacitance C and energy consumption resistor R；
The thyristor TaFor direct current reactance to be bypassed；
The recharged capacitance C discharge process is thyristor TaThe back-pressure of reliable turn-off is provided, reverse charging process quickly absorbs directly
The anti-energy of galvanic electricity；
The energy consumption resistor R, using thyristor and commutation capacitor cooperation investment energy-absorbing capacitor and energy consumption resistor, steady-state loss is low,
Arrester energy consumption demand is effectively reduced.
6. a kind of control method of novel multiport current-limiting type dc circuit breaker a method as claimed in any one of claims 1 to 5, feature
It is, normal operation included by novel multiport current-limiting type dc circuit breaker or before detecting a DC line fault, institute
The method of stating includes:
All IGBT conducting in through-flow branch, steady-state current or fault current flow through through-flow branch.
Capacitor precharge branch thyristor TgWith current limliting branch Tg1Conducting, DC grid are pre-charged through bridge arm diode to capacitor.
7. a kind of control method of novel multiport current-limiting type dc circuit breaker a method as claimed in any one of claims 1 to 5, feature
It is, after the failure that the DC line 1 where detecting novel multiport current-limiting type dc circuit breaker occurs, the method packet
It includes:
Protective device issues instruction, and bridge arm thyristor T is connected in all IGBT shutdown of through-flow branch where faulty line1', it is main disconnected
Road device IGBT and current limliting branch thyristor Ta, the LCS module of the through-flow branch of faulty line is turned off, and to the through-flow of faulty line
Branch and non-fault line bridge arm UFD issue separating brake instruction；
Supper-fast mechanical switch completes disjunction, gives TbAnd TcContinuity signal, TbIt is connected immediately due to bearing positive pressure, TaStart to bear anti-
Pressure, capacitor C1Start to discharge.TaIt can be complete switched off after bearing a period of time back-pressure.
Capacitance voltage uC=0, subsequent C1Reverse charging, then TcIt is connected because bearing positive pressure.Work as C1Both end voltage is higher than system voltage
When, C1Middle electric current starts to reduce.t4Moment capacitance current is reduced to zero, current-limiting inductance LFCLIt is put into fault loop completely.
It is first turned off main circuit breaker IGBT ', and conducts energy shifts branch T1、Td, reactance is quickly bypassed, lightning arrestor movement, failure
Electric current is gradually reduced to 0.
8. a kind of control method of the novel multiport current-limiting type dc circuit breaker as described in claim 1-4 is any, feature
It is, after a faulty line electric current included by multiport dc circuit breaker falls to zero, which comprises
Arrester all absorbs dump energy, and line current falls to 0, and T is connectedb, capacitor C starts to discharge, TaBack-pressure is born,
It is turned off after a period of time.
TaShutdown, direct current reactance and R, C constitute circuit, to capacitor charging, and through conductive discharge.Since Absorption Capacitance exists, energy
Fast transfer.
Electric current in direct current reactance falls to 0, thyristor T1And T1' shutdown, all dissipation of direct current reactance energy, hereafter, capacitor warp
Conductive discharge energy consumption.By UFDi' (i=2,3 ..., n) combined floodgate.
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| CN110994568A (en) * | 2019-12-11 | 2020-04-10 | 华北电力大学 | Multi-port current-limiting circuit breaker applicable to direct-current power grid |
| CN111244917A (en) * | 2020-03-20 | 2020-06-05 | 中国科学院电工研究所 | Multi-port direct current circuit breaker and control method |
| CN111371100A (en) * | 2020-03-16 | 2020-07-03 | 华北电力大学 | Composite direct current power flow controller with fault current limiting and circuit breaking functions |
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| CN112909899A (en) * | 2021-01-19 | 2021-06-04 | 山东大学 | Multi-port hybrid direct-current circuit breaker with self-adaptive reclosing function and control method |
| CN112909899B (en) * | 2021-01-19 | 2022-04-15 | 山东大学 | Multi-port hybrid direct-current circuit breaker with self-adaptive reclosing function and control method |
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| WO2022183696A1 (en) * | 2021-03-05 | 2022-09-09 | 全球能源互联网研究院有限公司 | Multifunctional multi-port hybrid direct-current circuit breaker and control method |
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| CN114172135B (en) * | 2021-12-15 | 2023-10-27 | 天津大学 | Double-main-break type multi-port hybrid direct current breaker applicable to multi-port direct current power grid |
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