CN107732878A - The direct current network harmonious protection method and apparatus of the current limiter containing resistive superconducting - Google Patents

The direct current network harmonious protection method and apparatus of the current limiter containing resistive superconducting Download PDF

Info

Publication number
CN107732878A
CN107732878A CN201710717286.9A CN201710717286A CN107732878A CN 107732878 A CN107732878 A CN 107732878A CN 201710717286 A CN201710717286 A CN 201710717286A CN 107732878 A CN107732878 A CN 107732878A
Authority
CN
China
Prior art keywords
current
fault
current limiter
resistive superconducting
containing resistive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201710717286.9A
Other languages
Chinese (zh)
Other versions
CN107732878B (en
Inventor
赵成勇
孔明
吴亚楠
许建中
谢素娟
赵坚鹏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Corp of China SGCC
North China Electric Power University
Global Energy Interconnection Research Institute
State Grid Hubei Electric Power Co Ltd
Original Assignee
State Grid Corp of China SGCC
North China Electric Power University
Global Energy Interconnection Research Institute
State Grid Hubei Electric Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by State Grid Corp of China SGCC, North China Electric Power University, Global Energy Interconnection Research Institute, State Grid Hubei Electric Power Co Ltd filed Critical State Grid Corp of China SGCC
Priority to CN201710717286.9A priority Critical patent/CN107732878B/en
Publication of CN107732878A publication Critical patent/CN107732878A/en
Application granted granted Critical
Publication of CN107732878B publication Critical patent/CN107732878B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors

Abstract

The invention discloses a kind of direct current network harmonious protection method and apparatus of current limiter containing resistive superconducting, the current limiter containing resistive superconducting puts into fault discharge loop when direct current network breaks down, and wherein method includes：The first impedance ranges of the current limiter containing resistive superconducting according to obtaining the condition that the fault discharge loop reaches overdamping state；The second impedance ranges of the current limiter containing resistive superconducting according to obtaining the condition that the fault current in the fault discharge loop starts to decay；The 3rd impedance ranges of the current limiter containing resistive superconducting according to obtaining the actuation time of main circuit breaker in dc circuit breaker；The impedance value of the current limiter containing resistive superconducting according to obtaining first impedance ranges, second impedance ranges and the 3rd impedance ranges.Choosing superconductive current limiter impedance value by this method can make fault current be effectively suppressed, while ensure dc circuit breaker reliable turn-off fault current, reduce the voltage x current stress of switching device.

Description

The direct current network harmonious protection method and apparatus of the current limiter containing resistive superconducting
Technical field
The present invention relates to technical field of direct current power transmission, and in particular to a kind of direct current of current limiter containing resistive superconducting Net harmonious protection method and apparatus.
Background technology
Flexible direct current based on modularization multi-level converter (Modular Multilevel Converter, MMC) is defeated Electricity, have the advantages that high modularization, active reactive flexibly control, can powered to passive load, be widely used in wind power plant simultaneously Net, isolated island and the power supply of light current net and the field such as urban electricity supply.Meanwhile direct current network is " low resistance " system, failure is electric Stream development is fast, fault incidence is wide.Direct current network solves the problems, such as that the main stream approach of DC line fault is in AC line at present Road both sides installation high voltage DC breaker (DC circuit breaker, DCCB).Pass through rational fault detect and route selection machine System, the dc circuit breaker can of tripping faulty line both sides quickly remove faulty line.In this course, circuit is perfected And whole current conversion stations remain on, there is no significant impact to AC system.Therefore, it is expected to high voltage DC breaker will Played an increasingly important role in following direct current network.
But under current technology background, if using the bipolar short trouble in high voltage DC breaker isolated DC side, it is necessary to Increase the reactance value of smoothing reactor to limit the climbing speed of direct fault current, be the mechanical switch in dc circuit breaker Drop-out current provides necessary time, while needs dc circuit breaker in time internal cutting off direct fault current as short as possible, Therefore between intrinsic break time and disengagement failure size of current there is contradiction in high voltage DC breaker.
Due to its excellent performance (impedance value is not presented, in age at failure in resistive superconducting current limiter under normal operation Between resistance quickly change, resistance is presented rapidly) gradually cause the attention of domestic and international experts and scholars.But at present about direct current The harmonious protection fitting method of resistive superconducting current limiter and other key equipments lacks foundation in power network.
The content of the invention
In view of this, according in a first aspect, the embodiments of the invention provide a kind of direct current of current limiter containing resistive superconducting Electric network coordination guard method, current limiter containing resistive superconducting put into fault discharge loop, the party when direct current network breaks down Method includes：The condition for reaching overdamping state according to fault discharge loop obtains the first impedance of the current limiter containing resistive superconducting Scope；The condition for starting decay according to the fault current in fault discharge loop obtains the second resistance of the current limiter containing resistive superconducting Anti- scope；3rd impedance model of the current limiter containing resistive superconducting is obtained according to the actuation time of main circuit breaker in dc circuit breaker Enclose；The impedance of the current limiter containing resistive superconducting is obtained according to the first impedance ranges, the second impedance ranges and the 3rd impedance ranges Value.
Alternatively, the condition that fault discharge loop reaches overdamping state is： [(2RSFCL+Rs)Cs]2-4[(Ls+2Ldc) Cs] ＞ 0, wherein, RSFCLThe resistance presented for current limiter containing resistive superconducting, RsFor current conversion station inside equivalent resistance, CsFor Equivalent capacitance value inside current conversion station, LsFor current conversion station inside equivalent reactance value, LdcFor the flat ripple reactance value of DC line.
Alternatively, the of superconductive current limiter is obtained in the condition for starting decay according to the fault current in fault discharge loop Before two impedance ranges, in addition to：Obtain the electrical energy parameter in fault discharge loop；Fault current is calculated according to electrical energy parameter Rate of change；When the rate of change of fault current is less than zero, confirm that fault current starts to decay.
Alternatively, the 3rd impedance ranges of the current limiter containing resistive superconducting are obtained according to the shut-off moment of dc circuit breaker, Including：Calculate the Fisrt fault current value during action of main circuit breaker in dc circuit breaker；Fisrt fault current value is calculated to be less than The 3rd impedance ranges during pre-set current value.
According to second aspect, the embodiments of the invention provide a kind of coordination of the direct current network of current limiter containing resistive superconducting Protection device, current limiter containing resistive superconducting put into fault discharge loop when direct current network breaks down, including：First resistance Anti- scope confirmation unit, the condition for reaching overdamping state according to fault discharge loop obtain current limliting containing resistive superconducting First impedance ranges of device；Second impedance ranges confirmation unit, for starting to decay according to the fault current in fault discharge loop Condition obtain the second impedance ranges of the current limiter containing resistive superconducting；3rd impedance ranges confirmation unit, for according to direct current The actuation time of main circuit breaker obtains the 3rd impedance ranges of the current limiter containing resistive superconducting in breaker；First impedance confirms Unit, for obtaining the current limiter containing resistive superconducting according to the first impedance ranges, the second impedance ranges and the 3rd impedance ranges Impedance value.
Alternatively, the condition that fault discharge loop reaches overdamping state is： [(2RSFCL+Rs)Cs]2-4[(Ls+2Ldc) Cs] ＞ 0, wherein, RSFCLThe resistance presented for current limiter containing resistive superconducting, RsFor current conversion station inside equivalent resistance, CsFor Equivalent capacitance value inside current conversion station, LsFor current conversion station inside equivalent reactance value, LdcFor the flat ripple reactance value of DC line.
Alternatively, the direct current network harmonious protection device of resistive superconducting current limiter also includes：Acquiring unit, for obtaining Take the electrical energy parameter in fault discharge loop；First computing unit, for calculating the rate of change of fault current according to electrical energy parameter； Confirmation unit, for when the rate of change of fault current is less than zero, confirming that fault current starts to decay.
Alternatively, the 3rd impedance ranges confirmation unit includes：First computation subunit, for calculating in dc circuit breaker Fisrt fault current value during the action of main circuit breaker；Second computation subunit, it is less than in advance for calculating Fisrt fault current value If the 3rd impedance ranges during current value.
According to the third aspect, the embodiments of the invention provide a kind of non-transient computer readable storage medium storing program for executing, non-transient meter Calculation machine readable storage medium storing program for executing stores computer instruction, and computer instruction is used to make computer perform as above-mentioned first aspect is any The direct current network harmonious protection method of the current limiter containing resistive superconducting of one description.
According to fourth aspect, the embodiments of the invention provide a kind of terminal, including：At least one processor；And with extremely The memory of few processor communication connection；Wherein, memory storage, which has, to be instructed by the instruction of a computing device By at least one computing device, so that at least one computing device contains electricity as described in above-mentioned first aspect any one The direct current network harmonious protection method of resistance type superconductive current limiter.
The embodiments of the invention provide the direct current network harmonious protection method and dress of a kind of current limiter containing resistive superconducting Put, superconductive current limiter impedance value is chosen using this method, after bipolar short trouble occurs for the DC side of direct current network, failure Quickly increase causes superconductive current limiter that resistance is presented to electric current, now because fault discharge loop meets the first two condition, failure electricity Stream will decay.In the main circuit breaker action of dc circuit breaker, due to meeting the 3rd condition, dc circuit breaker can be protected Demonstrate,prove the reliable turn-off of fault current.Choosing superconductive current limiter impedance value by this method can be such that fault current is effectively pressed down System, while ensure dc circuit breaker reliable turn-off fault current, reduce the voltage x current stress of switching device.
Brief description of the drawings
, below will be to tool in order to illustrate more clearly of the specific embodiment of the invention or technical scheme of the prior art The required accompanying drawing used is briefly described in body embodiment or description of the prior art, it should be apparent that, in describing below Accompanying drawing be some embodiments of the present invention, for those of ordinary skill in the art, do not paying creative work Under the premise of, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 shows that discharge loop during the bipolar short trouble of the DC line of the embodiment of the present invention is converted into MMC values and put Electric circuit diagram；；
Fig. 2 shows the direct current network harmonious protection method flow of the current limiter containing resistive superconducting of the embodiment of the present invention Schematic diagram；
Fig. 3 shows the direct current network harmonious protection schematic device of current limiter containing resistive superconducting of the embodiment of the present invention；
Fig. 4 shows the terminal schematic diagram of the embodiment of the present invention.
Embodiment
Technical scheme is clearly and completely described below in conjunction with accompanying drawing, it is clear that described reality It is part of the embodiment of the present invention to apply example, rather than whole embodiments.It is common based on the embodiment in the present invention, this area The every other embodiment that technical staff is obtained under the premise of creative work is not made, belong to what the present invention protected Scope.
In the description of the invention, it is necessary to illustrate, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or integratedly be connected Connect；Can be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected by intermediary, The connection of two element internals is can also be, can be wireless connection or wired connection.For the common of this area For technical staff, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
The embodiments of the invention provide a kind of direct current network harmonious protection method of current limiter containing resistive superconducting, containing electricity Resistance type superconductive current limiter puts into fault discharge loop when direct current network breaks down, and Fig. 1 shows the bipolar short circuit of DC line Discharge loop during failure is converted into modularization multi-level converter (Modular Multilevel Converter, MMC) etc. It is worth discharge circuit schematic diagram, wherein, Larm, RarmFor MMC bridge arms inductance and resistance, UdcFor DC voltage；Cs、Ls、RsFor transverter Equivalent electric capacity, inductance and resistance；RSFCLFor the resistance of superconductive current limiter；LdcFor the flat ripple reactance on DC line, SM1, SM2 ... SMn are MMC submodule, as shown in Fig. 2 this method can include：
S11. the condition for reaching overdamping state according to fault discharge loop obtains first of the current limiter containing resistive superconducting Impedance ranges.In the particular embodiment, t=t1When failure occur, the R of current limiter containing resistive superconducting nowSFCLResistance is very It is small, it is approximately 0.T=t2When, RSFCLQuick increase, then now kirchhoff (KVL) equation of discharge loop is：
In the present embodiment, the condition that fault discharge loop reaches overdamping state is： [(2RSFCL+Rs)Cs]2-4[(Ls+ 2Ldc)Cs] ＞ 0,
Wherein, RSFCLThe resistance presented for current limiter containing resistive superconducting, RsFor current conversion station inside equivalent resistance, CsFor Equivalent capacitance value inside current conversion station, LsFor current conversion station inside equivalent reactance value, LdcFor the flat ripple reactance value of DC line.In event During barrier, RsFor current conversion station inside equivalent resistance, CsFor current conversion station inside equivalent capacitance value, LsFor current conversion station inside equivalent electric Anti- value can be：
Wherein, CSMFor submodule capacitance, N is the submodule number of each bridge arms of MMC, LarmFor bridge arm reactance, RarmFor Arm resistance.
The expression formula for the condition that overdamping state can be reached according to fault discharge loop in the present embodiment is calculated First impedance ranges of the current limiter containing resistive superconducting, that is, meet that the impedance ranges can make fault discharge loop that resistance be presented Buddhist nun's state.
S12. the condition for starting decay according to the fault current in fault discharge loop obtains the current limiter containing resistive superconducting Second impedance ranges.In the particular embodiment, the electrical energy parameter in fault discharge loop can be obtained, alleged electrical energy parameter can With electric current and voltage including fault discharge loop, according to the rate of change of electrical energy parameter calculating fault current, when fault current When rate of change is less than zero, confirm that fault current starts to decay.In the present embodiment, the electric current U in fault discharge loopdcAnd voltage ifFor：
Wherein, t2Moment starts current limiter containing resistive superconducting and impedance is presented.
Wherein,
R in the present embodiment1And r2For two characteristic roots of KVL equations, in the present embodiment, r1And r2Expression formula be：
After the expression formula of fault current is obtained, to fault current expression formula derivation, the change of fault current can be obtained Rate, the rate of change of fault current are shown below：
Work as t=t2When, the rate of change of its fault current is
To make fault current in t2Start to decay after moment, understand that failure is put according to the rate of change expression formula of fault current The fault current of electrical circuit start decay condition be：
U0-(2RSFCL+Rs)I0＜ 0
In the present embodiment, the expression formula of the condition of decay can be started according to the fault current in fault discharge loop, can So that the second impedance ranges of the current limiter containing resistive superconducting are calculated.In the present embodiment, the change of fault current will be presented For an exponential decaying course.Direct fault current ifIt is t at the time of maximum2Moment.
S13. the 3rd resistance of the current limiter containing resistive superconducting is obtained according to the actuation time of main circuit breaker in dc circuit breaker Anti- scope.In the particular embodiment, main circuit breaker valve section is turned off in dc circuit breaker, and direct fault current will be gradually reduced It is zero.To ensure that the electric current flowed through when dc circuit breaker turns off does not burn dc circuit breaker, in the present embodiment, make direct current The electric current during shut-off of breaker is less than the maximum turn off current of dc circuit breaker, and the shut-off moment of dc circuit breaker is t= t3, then the fault current during shut-off of dc circuit breaker be：
The fault current during shut-off of dc circuit breaker should meet following condition：
if(t3) ＜ Ipeak
Wherein,：IpeakFor dc circuit breaker maximum drop-out current.
S14. current limliting containing resistive superconducting is obtained according to the first impedance ranges, the second impedance ranges and the 3rd impedance ranges The impedance value of device.
Superconductive current limiter impedance value is chosen using this method, after bipolar short trouble occurs for the DC side of direct current network, Quickly increase causes superconductive current limiter that resistance is presented to fault current, now because fault discharge loop meets the first two condition, therefore Barrier electric current will decay.In the main circuit breaker action of dc circuit breaker, due to meeting the 3rd condition, dc circuit breaker can To ensure the reliable turn-off of fault current.Fault current can be had by choosing superconductive current limiter impedance value by this method Effect suppresses, while ensures dc circuit breaker reliable turn-off fault current, reduces the voltage x current stress of switching device.
The embodiment of the present invention additionally provides a kind of direct current network harmonious protection device of current limiter containing resistive superconducting, contains Resistive superconducting current limiter puts into fault discharge loop when direct current network breaks down, as shown in figure 3, the device includes：
First impedance ranges confirmation unit 10, the condition for reaching overdamping state according to fault discharge loop obtain First impedance ranges of the current limiter containing resistive superconducting；Second impedance ranges confirmation unit 20, for according to fault discharge loop Fault current start decay condition obtain the second impedance ranges of the current limiter containing resistive superconducting；3rd impedance ranges are true Unit 30 is recognized, for obtaining the 3rd of the current limiter containing resistive superconducting according to the actuation time of main circuit breaker in dc circuit breaker Impedance ranges；First impedance confirmation unit 40, for according to the first impedance ranges, the second impedance ranges and the 3rd impedance ranges Obtain the impedance value of the current limiter containing resistive superconducting.
In an alternate embodiment of the invention, the condition that fault discharge loop reaches overdamping state is： [(2RSFCL+Rs)Cs]2-4 [(Ls+2Ldc)Cs] ＞ 0, wherein, RSFCLThe resistance presented for current limiter containing resistive superconducting, RsFor current conversion station inside equivalent electric Resistance, CsFor current conversion station inside equivalent capacitance value, LsFor current conversion station inside equivalent reactance value, LdcFor the flat ripple electricity of DC line Anti- value.
In an alternate embodiment of the invention, the direct current network harmonious protection device of resistive superconducting current limiter also includes：Obtain single Member, for obtaining the electrical energy parameter in fault discharge loop；First computing unit, for calculating fault current according to electrical energy parameter Rate of change；Confirmation unit, for when the rate of change of fault current is less than zero, confirming that fault current starts to decay.
In an alternate embodiment of the invention, the 3rd impedance ranges confirmation unit includes：First computation subunit is straight for calculating Flow the Fisrt fault current value during action of main circuit breaker in breaker；Second computation subunit, for calculating Fisrt fault electricity Flow valuve is less than the 3rd impedance ranges during pre-set current value.
The embodiment of the present invention additionally provides a kind of non-transitory computer-readable medium, non-transient computer readable storage medium Matter stores computer instruction, and computer instruction is used to make computer perform as any one description contains resistance in above-mentioned embodiment The direct current network harmonious protection method of type superconductive current limiter.Wherein, storage medium can be magnetic disc, CD, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), flash memory (Flash Memory), hard disk (Hard Disk Drive, abbreviation：HDD) or solid state hard disc (Solid-State Drive, SSD) etc.；Storage medium can also include the combination of the memory of mentioned kind.
The embodiments of the invention provide a kind of terminal, as shown in figure 4, the terminal include one or more processors 51 with And memory 52, in Fig. 4 by taking a processor 53 as an example.
User terminal can also include：Input unit 53 and output device 54.
Processor 51, memory 52, input unit 53 and output device 54 can be connected by bus or other modes Connect, in Fig. 4 exemplified by being connected by bus.
Processor 51 can be central processing unit (Central Processing Unit, CPU).Processor 51 can be with For other general processors, digital signal processor (Digital Signal Processor, DSP), application specific integrated circuit (Application Specific Integrated Circuit, ASIC), field programmable gate array (Field- Programmable Gate Array, FPGA) either other PLDs, discrete gate or transistor logic device The chips such as part, discrete hardware components, or the combination of above-mentioned all kinds of chips.General processor can be microprocessor or should Processor can also be any conventional processor etc..
Memory 52 is used as a kind of non-transient computer readable storage medium storing program for executing, available for storing non-transient software program, non- Transient computer executable program and module, program refers to as corresponding to the connection method of Bluetooth device in the embodiment of the present application Order/module.Processor 51 is stored in non-transient software program, instruction and module in memory 52 by operation, so as to hold The various function application of row server and data processing, that is, realize above method embodiment current limiter containing resistive superconducting Direct current network harmonious protection method.
Memory 52 can include storing program area and storage data field, wherein, storing program area can store operation system Application program required for system, at least one function；Storage data field can be stored according to the processing units of user terminal operations Use created data etc..In addition, memory 52 can include high-speed random access memory, can also include non-transient Memory, for example, at least a disk memory, flush memory device or other non-transient solid-state memories.In some implementations In example, memory 52 is optional including relative to the remotely located memory of processor 51.The example of above-mentioned network is included but not It is limited to internet, intranet, LAN, mobile radio communication and combinations thereof.
Input unit 53 can receive the numeral or character information of input, and produce and the processing unit of user terminal The key signals input that user is set and function control is relevant.Output device 54 may include the display devices such as display screen.
One or more module is stored in memory 52, when being performed by one or more processor 51, is performed Method as shown in Fig. 1 or 3.
It is to lead to it will be understood by those skilled in the art that realizing all or part of flow in above-described embodiment method Computer program is crossed to instruct the hardware of correlation to complete, program can be stored in a computer read/write memory medium, should Program is upon execution, it may include such as the flow of the embodiment of above-mentioned each method.Wherein, storage medium can be magnetic disc, CD, Read-only memory (ROM) or random access memory (RAM) etc.
Although being described in conjunction with the accompanying embodiments of the present invention, those skilled in the art can not depart from this Various modification can be adapted in the case of the spirit and scope of invention and modification, and such modifications and variations are each fallen within by appended right It is required that within limited range.

Claims (10)

1. a kind of direct current network harmonious protection method of current limiter containing resistive superconducting, the current limiter containing resistive superconducting is straight Fault discharge loop is put into when flowing grid collapses, it is characterised in that including：
First of the current limiter containing resistive superconducting according to obtaining the condition that the fault discharge loop reaches overdamping state Impedance ranges；
The current limiter containing resistive superconducting according to obtaining the condition that the fault current in the fault discharge loop starts to decay Second impedance ranges；
The 3rd impedance model of the current limiter containing resistive superconducting according to obtaining the actuation time of main circuit breaker in dc circuit breaker Enclose；
Limited according to obtaining first impedance ranges, second impedance ranges and the 3rd impedance ranges containing resistive superconducting Flow the impedance value of device.
2. the direct current network harmonious protection method of the current limiter containing resistive superconducting as claimed in claim 1, it is characterised in that institute State fault discharge loop and reach the condition of overdamping state and be：
[(2RSFCL+Rs)Cs]2-4[(Ls+2Ldc)Cs] ＞ 0,
Wherein, RSFCLThe resistance presented for the current limiter containing resistive superconducting, RsFor current conversion station inside equivalent resistance, CsFor Equivalent capacitance value inside current conversion station, LsFor current conversion station inside equivalent reactance value, LdcFor the flat ripple reactance value of DC line.
3. the direct current network harmonious protection method of the current limiter containing resistive superconducting as claimed in claim 1, it is characterised in that The condition for starting decay according to the fault current in the fault discharge loop obtains the second impedance ranges of the superconductive current limiter Before, in addition to：
Obtain the electrical energy parameter in fault discharge loop；
The rate of change of the fault current is calculated according to the electrical energy parameter；
When the rate of change of the fault current is less than zero, confirm that the fault current starts to decay.
4. the direct current network harmonious protection method of the current limiter containing resistive superconducting as described in claim 1-3 any one, its Be characterised by, the shut-off moment according to dc circuit breaker obtain described in the current limiter containing resistive superconducting the 3rd impedance model Enclose, including：
Calculate the fault curre during action of main circuit breaker in dc circuit breaker；
Calculate the 3rd impedance ranges when Fisrt fault current value is less than pre-set current value.
5. a kind of direct current network harmonious protection device of current limiter containing resistive superconducting, the current limiter containing resistive superconducting is straight Fault discharge loop is put into when flowing grid collapses, it is characterised in that including：
First impedance ranges confirmation unit, described in the condition for reaching overdamping state according to the fault discharge loop obtains First impedance ranges of the current limiter containing resistive superconducting；
Second impedance ranges confirmation unit, the condition for starting decay according to the fault current in the fault discharge loop obtain Second impedance ranges of the current limiter containing resistive superconducting；
3rd impedance ranges confirmation unit, for containing resistance described in being obtained according to the actuation time of main circuit breaker in dc circuit breaker 3rd impedance ranges of type superconductive current limiter；
First impedance confirmation unit, for according to first impedance ranges, second impedance ranges and the 3rd impedance ranges Obtain the impedance value of the current limiter containing resistive superconducting.
6. the direct current network harmonious protection device of the current limiter containing resistive superconducting as claimed in claim 5, it is characterised in that institute State fault discharge loop and reach the condition of overdamping state and be：
[(2RSFCL+Rs)Cs]2-4[(Ls+2Ldc)Cs] ＞ 0,
Wherein, RSFCLThe resistance presented for the current limiter containing resistive superconducting, RsFor current conversion station inside equivalent resistance, CsFor Equivalent capacitance value inside current conversion station, LsFor current conversion station inside equivalent reactance value, LdcFor the flat ripple reactance value of DC line.
7. the direct current network harmonious protection device of the current limiter containing resistive superconducting as claimed in claim 5, it is characterised in that also Including：
Acquiring unit, for obtaining the electrical energy parameter in fault discharge loop；
First computing unit, for calculating the rate of change of the fault current according to the electrical energy parameter；
Confirmation unit, for when the rate of change of the fault current is less than zero, confirming that the fault current starts to decay.
8. the direct current network harmonious protection device of the current limiter containing resistive superconducting as described in claim 5-7 any one, its It is characterised by, the 3rd impedance ranges confirmation unit includes：
First computation subunit, Fisrt fault current value during for calculating the action of main circuit breaker in dc circuit breaker；
Second computation subunit, for calculating the 3rd impedance ranges when fault curre is less than pre-set current value.
A kind of 9. non-transient computer readable storage medium storing program for executing, it is characterised in that
The non-transient computer readable storage medium storing program for executing stores computer instruction, and the computer instruction is used to make the computer Perform the direct current network harmonious protection method of the current limiter containing resistive superconducting as described in claim 1-4 any one.
A kind of 10. terminal, it is characterised in that including：At least one processor；And be connected with least one processor communication Memory；Wherein, memory storage, which has, to be instructed by the instruction of a computing device by least one computing device, with Assist the direct current network of containing resistive superconducting current limiter of at least one computing device as described in claim 1-4 any one Adjust guard method.
CN201710717286.9A 2017-08-21 2017-08-21 The DC grid harmonious protection method and apparatus of the current limiter containing resistive superconducting Active CN107732878B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710717286.9A CN107732878B (en) 2017-08-21 2017-08-21 The DC grid harmonious protection method and apparatus of the current limiter containing resistive superconducting

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710717286.9A CN107732878B (en) 2017-08-21 2017-08-21 The DC grid harmonious protection method and apparatus of the current limiter containing resistive superconducting

Publications (2)

Publication Number Publication Date
CN107732878A true CN107732878A (en) 2018-02-23
CN107732878B CN107732878B (en) 2019-03-08

Family

ID=61205237

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710717286.9A Active CN107732878B (en) 2017-08-21 2017-08-21 The DC grid harmonious protection method and apparatus of the current limiter containing resistive superconducting

Country Status (1)

Country Link
CN (1) CN107732878B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108829989A (en) * 2018-06-22 2018-11-16 国网江苏电力设计咨询有限公司 Flexible direct current system direct current side major loop parameter design method containing superconducting direct current limiter
CN110098634A (en) * 2019-02-25 2019-08-06 上海电机学院 A kind of wind-electricity integration system with superconductive current limiter
CN110829396A (en) * 2019-11-18 2020-02-21 武汉大学 Hybrid direct-current transmission fault processing system and method based on current limiter and circuit breaker
CN113036724A (en) * 2021-02-08 2021-06-25 东南大学 Flexible direct-current short-circuit fault protection method based on thyristor chain and superconducting current limiter

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1695099A (en) * 2002-09-19 2005-11-09 国际整流器公司 Adaptive CFL control circuit
CN100452606C (en) * 2003-09-30 2009-01-14 Lg产电株式会社 Resistive superconducting fault current limiter
CN101794989A (en) * 2010-03-10 2010-08-04 中国科学院电工研究所 Current-limiting and controlling method of active damping of current-limiting and tank circuit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1695099A (en) * 2002-09-19 2005-11-09 国际整流器公司 Adaptive CFL control circuit
CN100452606C (en) * 2003-09-30 2009-01-14 Lg产电株式会社 Resistive superconducting fault current limiter
CN101794989A (en) * 2010-03-10 2010-08-04 中国科学院电工研究所 Current-limiting and controlling method of active damping of current-limiting and tank circuit

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108829989A (en) * 2018-06-22 2018-11-16 国网江苏电力设计咨询有限公司 Flexible direct current system direct current side major loop parameter design method containing superconducting direct current limiter
CN108829989B (en) * 2018-06-22 2022-04-01 国网江苏电力设计咨询有限公司 Method for designing parameters of main loop on direct current side of flexible direct current system containing superconducting direct current limiter
CN110098634A (en) * 2019-02-25 2019-08-06 上海电机学院 A kind of wind-electricity integration system with superconductive current limiter
CN110829396A (en) * 2019-11-18 2020-02-21 武汉大学 Hybrid direct-current transmission fault processing system and method based on current limiter and circuit breaker
CN113036724A (en) * 2021-02-08 2021-06-25 东南大学 Flexible direct-current short-circuit fault protection method based on thyristor chain and superconducting current limiter
CN113036724B (en) * 2021-02-08 2022-07-05 东南大学 Flexible direct-current short-circuit fault protection method based on thyristor chain and superconducting current limiter

Also Published As

Publication number Publication date
CN107732878B (en) 2019-03-08

Similar Documents

Publication Publication Date Title
CN107732878A (en) The direct current network harmonious protection method and apparatus of the current limiter containing resistive superconducting
Heidary et al. A DC-reactor-based solid-state fault current limiter for HVdc applications
Wang et al. A feasible coordination protection strategy for MMC-MTDC systems under DC faults
EP3672008B1 (en) Series compensator, and control method
EP3490091A1 (en) Novel combined dc circuit breaker and application method therefor
JP5622978B1 (en) DC power transmission system protection system, AC / DC converter, and DC power transmission system disconnection method
He et al. Analysis of the fault current limiting requirement and design of the bridge‐type FCL in the multi‐terminal DC grid
Wang et al. Generalised protection strategy for HB‐MMC‐MTDC systems with RL‐FCL under DC faults
CN206422685U (en) A kind of soft starting circuit for suppressing surge current
WO2015081615A1 (en) Direct-current circuit breaker
CN104953571A (en) Improved MMC (modular multi-level converter) structure with direct current fault clearing capacity
CN110350496A (en) A kind of multiterminal flexible direct current electric network fault current-limiting method and device
Xue et al. A modular hybrid DC circuit breaker with fault current self-adaptive control and protection coordination
CN103986122A (en) Modularized current-limiting circuit breaker power module with additional diodes
CN101944721A (en) Valve fault detection treatment method of high-voltage direct-current transmission system
Hagh et al. Application of non-superconducting fault current limiter to improve transient stability
CN112415426B (en) Single-phase earth fault detection method, system, terminal and readable storage medium of small-resistance earth system
CN203632229U (en) Short-circuit fault current limiter
CN107846004A (en) Inrush current and transformer excitation flow synthesis suppressing method and realization device
CN202111614U (en) Trigger circuit used for thyristor and fast bypass apparatus
Etxegarai et al. Performance of a superconducting breaker for the protection of HVDC grids
CN108683158A (en) A kind of dc circuit breaker
Yi et al. An investigation of snubber and protection circuits connections for power-electronic switch in hybrid DC circuit breaker
Yu et al. A novel current-limiting hybrid DC breaker based on thyristors
CN206962436U (en) Protection circuit, equipment and communication system

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
CB02 Change of applicant information

Address after: 102209 18 Riverside Avenue, Changping District science and Technology City, Beijing

Applicant after: Global energy Internet Institute, Inc.

Applicant after: State Grid Corporation of China

Applicant after: STATE GRID HUBEI ELECTRIC POWER COMPANY

Applicant after: North China Electric Power University

Address before: 102209 18 Riverside Avenue, Changping District science and Technology City, Beijing

Applicant before: Global energy Internet Institute, Inc.

Applicant before: State Grid Corporation of China

Applicant before: STATE GRID HUBEI ELECTRIC POWER COMPANY

Applicant before: North China Electric Power University

CB02 Change of applicant information
GR01 Patent grant
GR01 Patent grant