CN107732878B - The DC grid harmonious protection method and apparatus of the current limiter containing resistive superconducting - Google Patents
The DC grid harmonious protection method and apparatus of the current limiter containing resistive superconducting Download PDFInfo
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- CN107732878B CN107732878B CN201710717286.9A CN201710717286A CN107732878B CN 107732878 B CN107732878 B CN 107732878B CN 201710717286 A CN201710717286 A CN 201710717286A CN 107732878 B CN107732878 B CN 107732878B
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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- 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 DC grid harmonious protection method and apparatus of current limiter containing resistive superconducting; the current limiter containing resistive superconducting puts into fault discharge circuit when DC grid breaks down, and wherein method includes: to obtain the first impedance ranges of the current limiter containing resistive superconducting according to the condition that the fault discharge circuit reaches overdamping state；The second impedance ranges of the current limiter containing resistive superconducting are obtained according to the condition that the fault current in the fault discharge circuit starts decaying；The third impedance ranges of the current limiter containing resistive superconducting are obtained according to the actuation time of main circuit breaker in dc circuit breaker；The impedance value of the current limiter containing resistive superconducting is obtained according to first impedance ranges, second impedance ranges and third impedance ranges.Choosing superconductive current limiter impedance value by this method can make fault current be effectively suppressed, while guarantee dc circuit breaker reliable turn-off fault current, reduce the voltage and current stress of switching device.
Description
Technical field
The present invention relates to technical field of direct current power transmission, and in particular to a kind of DC grid of current limiter containing resistive superconducting
Harmonious protection method and apparatus.
Background technique
Flexible direct current based on modularization multi-level converter (Modular Multilevel Converter, MMC) is defeated
Electricity has many advantages, such as that high modularization, active reactive flexibly control, can power to passive load, is widely used in wind power plant simultaneously
Net, isolated island and the fields such as weak grid power supply and urban electricity supply.Meanwhile DC grid is " low resistance " system, failure electricity
Stream development is fast, fault incidence is wide.DC grid solves the problems, such as that the main stream approach of DC line fault is in AC line at present
High voltage DC breaker (DC circuit breaker, DCCB) is installed road two sides.Pass through reasonable fault detection and route selection machine
System, the dc circuit breaker of tripping faulty line two sides can quickly remove faulty line.In this course, sound circuit with
And whole converter stations remain operational, and do not have significant impact to AC system.Therefore, it is expected to high voltage DC breaker will be not
Come in DC grid to play an increasingly important role.
But under current technology background, if being needed using the bipolar short trouble in high voltage DC breaker isolated DC side
Increase the reactance value of smoothing reactor to limit the climbing speed of direct fault current, is opened for the mechanical switch in dc circuit breaker
Power-off stream provides the necessary time, while dc circuit breaker being needed to cut off direct fault current in the shortest possible time, because
There are contradictions between intrinsic break time and disengagement failure size of current for this 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 value quickly change, resistance value is presented rapidly) gradually cause the attention of domestic and international experts and scholars.But at present in relation to direct current
The harmonious protection fitting method of resistive superconducting current limiter and other key equipments lacks foundation in net.
Summary of the invention
In view of this, according in a first aspect, the embodiment of the invention provides a kind of direct currents of current limiter containing resistive superconducting
Electric network coordination guard method, current limiter containing resistive superconducting put into fault discharge circuit, the party when DC grid breaks down
Method includes: to obtain the first impedance model of the current limiter containing resistive superconducting according to the condition that fault discharge circuit reaches overdamping state
It encloses；The second impedance model of the current limiter containing resistive superconducting is obtained according to the condition that the fault current in fault discharge circuit starts decaying
It encloses；The third impedance ranges of the current limiter containing resistive superconducting are obtained according to the actuation time of main circuit breaker in dc circuit breaker；Root
The impedance value of the current limiter containing resistive superconducting is obtained according to the first impedance ranges, the second impedance ranges and third impedance ranges.
Optionally, fault discharge circuit reaches the condition of overdamping state are as follows: [(2RSFCL+Rs)Cs]2-4[(Ls+2Ldc)Cs]
> 0, wherein RSFCLFor the resistance value that current limiter containing resistive superconducting is presented, RsFor converter station inside equivalent resistance, CsFor the change of current
Equivalent capacitance value inside standing, LsFor converter station inside equivalent reactance value, LdcFor the flat wave reactance value of DC line.
Optionally, the second of superconductive current limiter is obtained in the condition for starting decaying according to the fault current in fault discharge circuit
Before impedance ranges, further includes: obtain the electrical energy parameter in fault discharge circuit；The variation of fault current is calculated according to electrical energy parameter
Rate；When the change rate of fault current is less than zero, confirmation fault current starts to decay.
Optionally, the third impedance ranges of the current limiter containing resistive superconducting are obtained according to the shutdown moment of dc circuit breaker,
It include: action failure current value when calculating the movement of main circuit breaker in dc circuit breaker；Calculating action fault curre is less than
Third impedance ranges when pre-set current value.
According to second aspect, coordinate to protect the embodiment of the invention provides a kind of DC grid of current limiter containing resistive superconducting
Protection unit, current limiter containing resistive superconducting put into fault discharge circuit when DC grid breaks down, comprising: the first impedance model
Confirmation unit is enclosed, the condition for reaching overdamping state according to fault discharge circuit obtains of the current limiter containing resistive superconducting
One impedance ranges；Second impedance ranges confirmation unit, for starting the condition of decaying according to the fault current in fault discharge circuit
Obtain the second impedance ranges of the current limiter containing resistive superconducting；Third impedance ranges confirmation unit, for according to dc circuit breaker
The actuation time of middle main circuit breaker obtains the third impedance ranges of the current limiter containing resistive superconducting；First impedance confirmation unit is used
In obtaining the impedance value of the current limiter containing resistive superconducting according to the first impedance ranges, the second impedance ranges and third impedance ranges.
Optionally, fault discharge circuit reaches the condition of overdamping state are as follows: [(2RSFCL+Rs)Cs]2-4[(Ls+2Ldc)Cs]
> 0, wherein RSFCLFor the resistance value that current limiter containing resistive superconducting is presented, RsFor converter station inside equivalent resistance, CsFor the change of current
Equivalent capacitance value inside standing, LsFor converter station inside equivalent reactance value, LdcFor the flat wave reactance value of DC line.
Optionally, the DC grid harmonious protection device of resistive superconducting current limiter further include: acquiring unit, for obtaining
The electrical energy parameter in fault discharge circuit；First computing unit, for calculating the change rate of fault current according to electrical energy parameter；Confirmation
Unit, for when the change rate of fault current is less than zero, confirmation fault current to start to decay.
Optionally, third impedance ranges confirmation unit includes: the first computation subunit, main in dc circuit breaker for calculating
Action failure current value when the movement of breaker；Second computation subunit is less than default for calculating action fault curre
Third impedance ranges when current value.
According to the third aspect, the embodiment of the invention provides a kind of non-transient computer readable storage medium, non-transient meter
Calculation machine readable storage medium storing program for executing stores computer instruction, and computer instruction is for executing computer as above-mentioned first aspect is any one
The DC grid harmonious protection method of the current limiter containing resistive superconducting of item description.
According to fourth aspect, coordinate to protect the embodiment of the invention provides a kind of DC grid of current limiter containing resistive superconducting
Protect terminal, comprising: at least one processor；And the memory being connect at least one processor communication；Wherein, memory is deposited
The instruction that can be executed by a processor is contained, instruction is executed by least one processor, so that at least one processor executes
The DC grid harmonious protection method of the current limiter containing resistive superconducting as described in above-mentioned first aspect any one.
The embodiment of the invention provides a kind of DC grid harmonious protection method and apparatus of current limiter containing resistive superconducting,
Superconductive current limiter impedance value is chosen using this method, after bipolar short trouble occurs for the DC side of DC grid, fault current
Quickly increase so that resistance value is presented in superconductive current limiter, at this time since fault discharge circuit meets the first two condition, fault current will
It can decay.In the main circuit breaker movement of dc circuit breaker, due to meeting third condition, dc circuit breaker can guarantee failure
The reliable turn-off of electric current.Choosing superconductive current limiter impedance value by this method can make fault current be effectively suppressed, simultaneously
Guarantee dc circuit breaker reliable turn-off fault current, reduces the voltage and current stress of switching device.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Discharge loop when Fig. 1 shows the DC line bipolar short trouble of the embodiment of the present invention is converted into MMC value and puts
Electric circuit diagram；；
Fig. 2 shows the DC grid harmonious protection method flows of the current limiter containing resistive superconducting of the embodiment of the present invention to show
It is intended to；
Fig. 3 shows the DC grid harmonious protection schematic device of current limiter containing resistive superconducting of the embodiment of the present invention；
Fig. 4 shows the DC grid harmonious protection terminal signal of the current limiter containing resistive superconducting of the embodiment of the present invention
Figure.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also indirectly connected through an intermediary, it can be with
It is the connection inside two elements, can be wireless connection, be also possible to wired connection.For those of ordinary skill in the art
For, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
The embodiment of the invention provides a kind of DC grid harmonious protection methods of current limiter containing resistive superconducting, contain resistance
Type superconductive current limiter puts into fault discharge circuit when DC grid breaks down, and Fig. 1 shows the bipolar short circuit event of DC line
Discharge loop when barrier is converted into modularization multi-level converter (Modular Multilevel Converter, MMC) equivalence
Discharge circuit schematic diagram, wherein Larm, RarmFor MMC bridge arm inductance and resistance, UdcFor DC voltage；Cs、Ls、RsFor inverter etc.
The capacitor of effect, inductance and resistance；RSFCLFor the resistance of superconductive current limiter；LdcFor the flat wave reactance on DC line, SM1,
SM2 ... SMn is the submodule of MMC, as shown in Fig. 2, this method may include:
S11. first of the current limiter containing resistive superconducting is obtained according to the condition that fault discharge circuit reaches overdamping state
Impedance ranges.In the particular embodiment, t=t1When failure occur, the R of current limiter containing resistive superconducting at this timeSFCLResistance value is very
It is small, it is approximately 0.T=t2When, RSFCLQuickly increase, then kirchhoff (KVL) equation of discharge loop at this time are as follows:
In the present embodiment, fault discharge circuit reaches the condition of overdamping state are as follows: [(2RSFCL+Rs)Cs]2-4[(Ls+
2Ldc)Cs] > 0,
Wherein, RSFCLFor the resistance value that current limiter containing resistive superconducting is presented, RsFor converter station inside equivalent resistance, CsFor
Equivalent capacitance value inside converter station, LsFor converter station inside equivalent reactance value, LdcFor the flat wave reactance value of DC line.In failure
Period, RsFor converter station inside equivalent resistance, CsFor converter station inside equivalent capacitance value, LsFor converter station inside equivalent reactance
Value can be with are as follows:
Wherein, CSMFor submodule capacitance, N is the submodule number of each bridge arm 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 circuit in the present embodiment is calculated
First impedance ranges of the current limiter containing resistive superconducting, that is, meeting the impedance ranges can make fault discharge circuit that overdamp be presented
State.
S12. the current limiter containing resistive superconducting is obtained according to the condition that the fault current in fault discharge circuit starts decaying
Second impedance ranges.In the particular embodiment, the electrical energy parameter in available fault discharge circuit, alleged electrical energy parameter can be with
Electric current and voltage including fault discharge circuit calculate the change rate of fault current according to electrical energy parameter, when the change of fault current
When rate is less than zero, confirmation fault current starts to decay.In the present embodiment, the electric current U in fault discharge circuitdcWith voltage if
Are as follows:
Wherein, t2Moment starts current limiter containing resistive superconducting and impedance is presented.
Wherein,
R in the present embodiment1And r2For two characteristic roots of KVL equation, in the present embodiment, r1And r2Expression formula are as follows:
After obtaining the expression formula of fault current, to fault current expression formula derivation, the variation of available fault current
The change rate of rate, fault current is shown below:
Work as t=t2When, the change rate of fault current is
To make fault current in t2Start to decay after moment, according to the change rate expression formula fault discharge of fault current
The fault current in circuit starts the condition of decaying are as follows:
U0-(2RSFCL+Rs)I0< 0
In the present embodiment, the expression formula that can start the condition of decaying according to the fault current in fault discharge circuit, can
The second impedance ranges of the current limiter containing resistive superconducting are calculated.In the present embodiment, the variation of fault current will be presented
For an exponential decaying course.Direct fault current ifIt is t at the time of maximum2Moment.
S13. it is hindered according to the third that the actuation time of main circuit breaker in dc circuit breaker obtains the current limiter containing resistive superconducting
Anti- range.In the particular embodiment, main circuit breaker valve section turns off in dc circuit breaker, and direct fault current will be gradually decreased as
Zero.To guarantee 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 interruption
The electric current when shutdown of device is less than the maximum turn off current of dc circuit breaker, and the shutdown moment of dc circuit breaker is t=t3, then directly
Flow the fault current when shutdown of breaker are as follows:
The fault current when shutdown of dc circuit breaker should meet following condition:
if(t3) < Ipeak
Wherein: IpeakFor dc circuit breaker maximum drop-out current.
S14. current limiter containing resistive superconducting is obtained according to the first impedance ranges, the second impedance ranges and third impedance ranges
Impedance value.
Superconductive current limiter impedance value is chosen using this method, after bipolar short trouble occurs for the DC side of DC grid,
Fault current quickly increase so that superconductive current limiter present resistance value, at this time since fault discharge circuit meets the first two condition, therefore
Barrier electric current will decay.In the main circuit breaker movement of dc circuit breaker, due to meeting third condition, dc circuit breaker can be with
Guarantee 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 guaranteeing dc circuit breaker reliable turn-off fault current, reduce the voltage and current stress of switching device.
The embodiment of the invention also provides a kind of DC grid harmonious protection devices of current limiter containing resistive superconducting, containing electricity
Resistance type superconductive current limiter puts into fault discharge circuit when DC grid 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 circuit are contained
First impedance ranges of resistive superconducting current limiter；Second impedance ranges confirmation unit 20, for according to fault discharge circuit
The condition that fault current starts decaying obtains the second impedance ranges of the current limiter containing resistive superconducting；Third impedance ranges confirmation form
Member 30, for obtaining the third impedance model of the current limiter containing resistive superconducting according to the actuation time of main circuit breaker in dc circuit breaker
It encloses；First impedance confirmation unit 40, for being obtained according to the first impedance ranges, the second impedance ranges and third impedance ranges containing electricity
The impedance value of resistance type superconductive current limiter.
In an alternate embodiment of the invention, fault discharge circuit reaches the condition of overdamping state are as follows: [(2RSFCL+Rs)Cs]2-4
[(Ls+2Ldc)Cs] > 0, wherein RSFCLFor the resistance value that current limiter containing resistive superconducting is presented, RsFor converter station inside equivalent resistance
Value, CsFor converter station inside equivalent capacitance value, LsFor converter station inside equivalent reactance value, LdcFor the flat wave reactance of DC line
Value.
In an alternate embodiment of the invention, the DC grid harmonious protection device of resistive superconducting current limiter further include: obtain single
Member, for obtaining the electrical energy parameter in fault discharge circuit；First computing unit, for calculating fault current according to electrical energy parameter
Change rate；Confirmation unit, for when the change rate of fault current is less than zero, confirmation fault current to start to decay.
In an alternate embodiment of the invention, third impedance ranges confirmation unit includes: the first computation subunit, for calculating direct current
Action failure current value in breaker when the movement of main circuit breaker；Second computation subunit is used for calculating action fault current
Value is less than third impedance ranges when pre-set current value.
The embodiment of the invention also provides a kind of non-transitory computer-readable medium, non-transient computer readable storage mediums
Computer instruction is stored, computer instruction is for executing computer as the description of any one of above-described embodiment is super containing resistor-type
Lead the DC grid harmonious protection method of current limiter.Wherein, storage medium can be magnetic disk, 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 disk (Solid-State Drive,
SSD) etc.；Storage medium can also include the combination of the memory of mentioned kind.
The embodiment of the invention provides a kind of DC grid harmonious protection terminal of current limiter containing resistive superconducting, such as Fig. 4
Shown, which includes one or more processors 51 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,
In Fig. 4 for 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), specific integrated circuit
(Application Specific Integrated Circuit, ASIC), field programmable gate array (Field-
Programmable Gate Array, FPGA) either other programmable logic device, discrete gate or transistor logic,
The combination of the chips such as discrete hardware components or above-mentioned all kinds of chips.General processor can be microprocessor or the processing
Device is also possible to any conventional processor etc..
Memory 52 is used as a kind of non-transient computer readable storage medium, can be used for storing non-transient software program, non-
Transient computer executable program and module, as the corresponding program of connection method of Bluetooth device in the embodiment of the present application refers to
Order/module.Non-transient software program, instruction and the module that processor 51 is stored in memory 52 by operation, to hold
The various function application and data processing of row server, i.e., realization above method embodiment current limiter containing resistive superconducting is straight
Galvanic electricity net harmonious protection method.
Memory 52 may include storing program area and storage data area, wherein storing program area can storage program area,
Application program required at least one function；Storage data area can store the use of the processing unit according to user terminal operations
The data etc. created.In addition, memory 52 may include high-speed random access memory, it can also include non-transient storage
Device, for example, at least a disk memory, flush memory device or other non-transient solid-state memories.In some embodiments,
Optional memory 52 includes the memory remotely located relative to processor 51.The example of above-mentioned network includes but is not limited to interconnect
Net, intranet, local area network, mobile radio communication and combinations thereof.
Input unit 53 can receive the number or character information of input, and generate the use with the processing unit of user terminal
Family setting and the related key signals input of function control.Output device 54 may include that display screen etc. shows equipment.
One or more module is stored in memory 52, when being executed by one or more processor 51, is executed
The method as shown in Fig. 1 or 3.
It is that can lead to it will be understood by those skilled in the art that realizing all or part of the process in above-described embodiment method
Computer program is crossed to instruct relevant hardware and complete, program can be stored in a computer-readable storage medium, the journey
Sequence is when being executed, it may include such as the process of the embodiment of above-mentioned each method.Wherein, storage medium can be magnetic disk, CD, read-only
Storage memory (ROM) or random access memory (RAM) etc.
Although the embodiments of the invention are described in conjunction with the attached drawings, but those skilled in the art can not depart from this hair
Various modifications and variations can be made in the case where bright spirit and scope, and such modifications and variations are each fallen within by appended claims
Within limited range.
Claims (10)
1. a kind of DC grid harmonious protection method of current limiter containing resistive superconducting, the current limiter containing resistive superconducting is straight
Fault discharge circuit is put into when flowing grid collapses characterized by comprising
The first of the current limiter containing resistive superconducting is obtained according to the condition that the fault discharge circuit reaches overdamping state
Impedance ranges；
The current limiter containing resistive superconducting is obtained according to the condition that the fault current in the fault discharge circuit starts decaying
Second impedance ranges；
The third impedance model of the current limiter containing resistive superconducting is obtained according to the actuation time of main circuit breaker in dc circuit breaker
It encloses；
It is obtained according to first impedance ranges, second impedance ranges and third impedance ranges described containing resistive superconducting limit
Flow the impedance value of device.
2. the DC grid harmonious protection method of the current limiter containing resistive superconducting as described in claim 1, which is characterized in that institute
State the condition that fault discharge circuit reaches overdamping state are as follows:
[(2RSFCL+Rs)Cs]2-4[(Ls+2Ldc)Cs] > 0,
Wherein, RSFCLFor the resistance value that the current limiter containing resistive superconducting is presented, RsFor converter station inside equivalent resistance, CsFor
Equivalent capacitance value inside converter station, LsFor converter station inside equivalent reactance value, LdcFor the flat wave reactance value of DC line.
3. the DC grid harmonious protection method of the current limiter containing resistive superconducting as described in claim 1, which is characterized in that
The second impedance ranges of the superconductive current limiter are obtained according to the condition that the fault current in the fault discharge circuit starts decaying
Before, further includes:
Obtain the electrical energy parameter in fault discharge circuit；
The change rate of the fault current is calculated according to the electrical energy parameter；
When the change rate of the fault current is less than zero, confirm that the fault current starts to decay.
4. the DC grid harmonious protection method of the current limiter as claimed in any one of claims 1-3 containing resistive superconducting,
It is characterized in that, the shutdown moment according to dc circuit breaker obtains the third impedance model of the current limiter containing resistive superconducting
It encloses, comprising:
Calculate the action failure current value when movement of main circuit breaker in dc circuit breaker；
Calculate the third impedance ranges of the action failure current value less than pre-set current value when.
5. a kind of DC grid harmonious protection device of current limiter containing resistive superconducting, the current limiter containing resistive superconducting is straight
Fault discharge circuit is put into when flowing grid collapses characterized by comprising
First impedance ranges confirmation unit, the condition for reaching overdamping state according to the fault discharge circuit obtain described
First impedance ranges of the current limiter containing resistive superconducting；
Second impedance ranges confirmation unit, the condition for starting decaying according to the fault current in the fault discharge circuit obtain
Second impedance ranges of the current limiter containing resistive superconducting；
Third impedance ranges confirmation unit, it is described containing resistance for being obtained according to the actuation time of main circuit breaker in dc circuit breaker
The third impedance ranges of type superconductive current limiter；
First impedance confirmation unit, for according to first impedance ranges, second impedance ranges and third impedance ranges
Obtain the impedance value of the current limiter containing resistive superconducting.
6. the DC grid harmonious protection device of the current limiter containing resistive superconducting as claimed in claim 5, which is characterized in that institute
State the condition that fault discharge circuit reaches overdamping state are as follows:
[(2RSFCL+Rs)Cs]2-4[(Ls+2Ldc)Cs] > 0,
Wherein, RSFCLFor the resistance value that the current limiter containing resistive superconducting is presented, RsFor converter station inside equivalent resistance, CsFor
Equivalent capacitance value inside converter station, LsFor converter station inside equivalent reactance value, LdcFor the flat wave reactance value of DC line.
7. the DC grid harmonious protection device of the current limiter containing resistive superconducting as claimed in claim 5, which is characterized in that also
Include:
Acquiring unit, for obtaining the electrical energy parameter in fault discharge circuit；
First computing unit, for calculating the change rate of the fault current according to the electrical energy parameter；
Confirmation unit, for confirming that the fault current starts to decay when the change rate of the fault current is less than zero.
8. the DC grid harmonious protection device of the current limiter containing resistive superconducting as described in claim 5-7 any one,
It is characterized in that, third impedance ranges confirmation unit includes:
First computation subunit, for calculating the action failure current value when movement of main circuit breaker in dc circuit breaker；
Second computation subunit, for calculating the third impedance model of the action failure current value less than pre-set current value when
It encloses.
9. a kind of non-transient computer readable storage medium, which is characterized in that
The non-transient computer readable storage medium stores computer instruction, and the computer instruction is for making the computer
Execute the DC grid harmonious protection method of the current limiter containing resistive superconducting as described in claim 1-4 any one.
10. a kind of DC grid harmonious protection terminal of current limiter containing resistive superconducting characterized by comprising at least one
Processor；And the memory being connect at least one processor communication；Wherein, memory, which is stored with, to be held by a processor
Capable instruction, instruction are executed by least one processor, so that at least one processor executes such as claim 1-4 any one
The DC grid harmonious protection method of the current limiter containing resistive superconducting.
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| Application Number | Priority Date | Filing Date | Title |
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| 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 |
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| 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 |
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| CN107732878B true CN107732878B (en) | 2019-03-08 |
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| 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 |
| CN110829396B (en) * | 2019-11-18 | 2022-04-15 | 武汉大学 | Hybrid direct-current transmission fault processing system and method based on current limiter and circuit breaker |
| 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 |
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| 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 |
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| 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 |
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