CN109617033A - Distribution system current-limiting method and device - Google Patents
Distribution system current-limiting method and device Download PDFInfo
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- CN109617033A CN109617033A CN201910015881.7A CN201910015881A CN109617033A CN 109617033 A CN109617033 A CN 109617033A CN 201910015881 A CN201910015881 A CN 201910015881A CN 109617033 A CN109617033 A CN 109617033A
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- intereelectrode short
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
Abstract
This application involves a kind of distribution system current-limiting method and devices；Wherein, distribution system current-limiting method is comprising steps of carry out failure multidomain treat-ment, the intereelectrode short-circuit failure for obtaining each system partitioning, and being analyzed to identify in each system partitioning to multiterminal flexible direct current distribution system；The corresponding breaker of each intereelectrode short-circuit failure is obtained respectively, and obtains the time to peak of the peak point current and peak point current that flow through each breaker；According to each peak point current and each time to peak, the sequence of current limliting grade of difficulty is carried out to each intereelectrode short-circuit failure respectively, obtains the highest intereelectrode short-circuit failure of current limliting grade of difficulty and the secondary high intereelectrode short-circuit failure of current limliting grade of difficulty；Discharge loop under above-mentioned fault condition respectively is gone using multiterminal flexible direct current distribution system electromagnetic transient simulation model, obtains the current-limiting apparatus parameter value of each discharge loop outlet in multiterminal flexible direct current distribution system.The application goes to confirm current-limiting apparatus parameter value from entire distribution system angle, improves troubleshooting efficiency.
Description
Technical field
This application relates to power distribution systems accident analysis field, more particularly to a kind of distribution system current-limiting method and device.
Background technique
With the development of power distribution system technology, multiterminal flexible direct current distribution system is because of its low cost, method of operation multiplicity
Reason is increasingly becoming the trend of the following DC grid development.But the diversification of accompanied topology structure and the method for operation, multiterminal
The fault clearance problem of flexible direct current distribution system also becomes more complicated.
Fault clearance measure relatively conventional at present has the following two kinds: using current-limiting reactor cooperation dc circuit breaker, adopting
Cooperate dc circuit breaker with superconductive current limiter.During realization, inventor has found that at least there are the following problems in traditional technology:
It is concentrated mainly on the internal structure of current limliting module for the research of current limliting parameter, inner parameter is carried out for a certain failure true
It is fixed, easily lead to troubleshooting low efficiency.
Summary of the invention
Based on this, it is necessary in view of the above technical problems, provide a kind of distribution that can be improved fault treatment effeciency
System current-limiting method and device.
To achieve the goals above, the embodiment of the invention provides a kind of distribution system current-limiting methods, this method comprises:
Each intereelectrode short-circuit failure in multiterminal flexible direct current distribution system is obtained respectively, and obtains the peak value electricity of each discharge loop
The time to peak of stream and peak point current；Discharge loop is the circuit to the short dot electric discharge in intereelectrode short-circuit failure；
According to each peak point current and each time to peak, the sequence of current limliting grade of difficulty is carried out to each intereelectrode short-circuit failure respectively,
Obtain the highest intereelectrode short-circuit failure of current limliting grade of difficulty and the secondary high intereelectrode short-circuit failure of current limliting grade of difficulty；
Using electromagnetic transient simulation model, to the highest intereelectrode short-circuit failure of current limliting grade of difficulty, current limliting grade of difficulty
High intereelectrode short-circuit failure is emulated, and the current-limiting apparatus ginseng of each discharge loop outlet in multiterminal flexible direct current distribution system is obtained
Numerical value.
The step of obtaining each intereelectrode short-circuit failure in multiterminal flexible direct current distribution system respectively in one of the embodiments,
Before, it further comprises the steps of:
It is soft to multiterminal according to the configuration of the dc circuit breaker of multiterminal flexible direct current distribution system, Preservation tactics and key position
Property direct-flow distribution system carry out failure subregion, obtain each system partitioning, and the intereelectrode short-circuit that is analyzed to identify in each system partitioning therefore
Barrier；
Obtain each discharge loop peak point current and peak point current time to peak the step of, comprising:
Equivalent process is carried out to discharge loop, obtains equivalent circuit；And equivalent circuit is handled, obtain peak point current and peak
It is worth the time.
Discharge loop includes converter station discharge loop and commutator transformer discharge loop in one of the embodiments,；
The step of handling equivalent circuit, obtaining peak point current and time to peak, comprising:
Equivalent process is carried out to converter station discharge loop and commutator transformer discharge loop respectively, obtains that converter station is equivalent to be put
Electrical circuit and the equivalent discharge loop of commutator transformer；
Using the equivalent discharge loop of second-order circuit primary condition processing converter station, the equivalent discharge loop of commutator transformer, divide
The electric current of converter station discharge loop, the electric current of direct current transformer discharge loop are not obtained；
The electric current of electric current, direct current transformer discharge loop based on converter station discharge loop, obtains converter station discharge loop
Current curve diagram, direct current transformer discharge loop current curve diagram；
According to the current curve diagram of converter station discharge loop, Peak current, the time to peak of converter station discharge loop are obtained；
According to the current curve diagram of direct current transformer discharge loop, Peak current, the time to peak of direct current transformer discharge loop are obtained.
In a specific embodiment, become using the equivalent discharge loop of second-order circuit primary condition processing converter station, direct current
The equivalent discharge loop of depressor, the step of respectively obtaining the electric current of the electric current of converter station discharge loop, direct current transformer discharge loop
In, it is based on following formula, obtains the peak point current of converter station discharge loop:
Wherein, I1 is the electric current of converter station discharge loop；ω is the oscillation angular frequency of the equivalent discharge loop of converter station；δ is
The time constant of the equivalent discharge loop of converter station；Udc is direct current voltage across poles；I0 is DC bus current；L is that converter station is equivalent
The equivalent inductance of discharge loop；ω 0 is the resonance angular frequency of the equivalent discharge loop of converter station.
In a specific embodiment, become using the equivalent discharge loop of second-order circuit primary condition processing converter station, direct current
The equivalent discharge loop of depressor, the step of respectively obtaining the electric current of the electric current of converter station discharge loop, direct current transformer discharge loop
In, it is based on following formula, obtains the peak point current of direct current transformer discharge loop:
Wherein, I2For the electric current of converter station discharge loop；ω1For the oscillation angular frequency of the equivalent discharge loop of direct current transformer；
δ1For the time constant of the equivalent discharge loop of direct current transformer；UdcFor direct current voltage across poles；I0For DC bus current；L1It is straight
The equivalent inductance of the equivalent discharge loop of galvanic electricity depressor；ω2For the resonance angular frequency of the equivalent discharge loop of direct current transformer.
In one of the embodiments, according to each peak point current and each time to peak, respectively to each intereelectrode short-circuit failure into
The sequence of row current limliting grade of difficulty obtains the highest intereelectrode short-circuit failure of current limliting grade of difficulty and the secondary high interpolar of current limliting grade of difficulty
The step of short trouble, comprising:
By the drop-out current value of breaker, does and subtract with the maximum current value of the discharge loop in the switch off time of breaker
Method obtains difference；Breaker is nearest apart from intereelectrode short-circuit failure and makes intereelectrode short-circuit failure and multiterminal flexible direct current power distribution system
The breaker of system isolation；Wherein, if time to peak is less than or equal to switch off time, maximum current value is the value of peak point current；If
Time to peak is greater than switch off time, and maximum current value is the current value to discharge loop at the end of switch off time；
According to the size order of each difference, the current limliting grade of difficulty sequence of each intereelectrode short-circuit failure is obtained.
Current-limiting apparatus parameter value includes current-limiting reactor value in one of the embodiments,；
Using electromagnetic transient simulation model, to the highest intereelectrode short-circuit failure of current limliting grade of difficulty, current limliting grade of difficulty
The step of high intereelectrode short-circuit failure is emulated, comprising:
Establish electromagnetic transient simulation model；
Based on electromagnetic transient simulation model, the corresponding electric discharge of the highest intereelectrode short-circuit failure of current limliting grade of difficulty is gradually improved
Current-limiting reactor value at circuit outlet, until the maximum current value of each discharge loop is respectively less than the first current limliting standard current value；
Based on electromagnetic transient simulation model, the high corresponding electric discharge of intereelectrode short-circuit failure of current limliting grade of difficulty time is gradually improved
Current-limiting reactor value at circuit outlet, until the maximum current value of each discharge loop is respectively less than the second current limliting standard current value.
The first current limliting standard current value is that drop-out current value and current limliting grade of difficulty are highest in one of the embodiments,
The quotient of the number of the corresponding discharge loop of intereelectrode short-circuit failure；
Second current limliting standard current value is that drop-out current value is corresponding with the high intereelectrode short-circuit failure of current limliting grade of difficulty time
The quotient of the number of discharge loop.
Electromagnetic transient simulation model is being used in one of the embodiments, it is short to the highest interpolar of current limliting grade of difficulty
Road failure, the high intereelectrode short-circuit failure of current limliting grade of difficulty time are emulated, and the current-limiting apparatus parameter of discharge loop outlet is obtained
After the step of value, further includes:
Using current-limiting apparatus parameter value, verified in the intereelectrode short-circuit failure of remaining current limliting grade of difficulty；Residue limit
The intereelectrode short-circuit failure for flowing grade of difficulty is to remove the highest intereelectrode short-circuit of current limliting grade of difficulty in multiterminal flexible direct current distribution system
Intereelectrode short-circuit failure other than the high intereelectrode short-circuit failure of failure, current limliting grade of difficulty time；
It is short to the interpolar of remaining current limliting grade of difficulty using electromagnetic transient simulation model when the result of verification is failure
Road failure is emulated.
The embodiment of the invention also provides a kind of distribution system current-limiting apparatus, comprising:
Data acquisition module for obtaining each intereelectrode short-circuit failure in multiterminal flexible direct current distribution system respectively, and obtains
The peak point current of each discharge loop and the time to peak of peak point current；Discharge loop is to the short circuit in intereelectrode short-circuit failure
The circuit of point electric discharge；
Sorting module, for carrying out current limliting to each intereelectrode short-circuit failure respectively according to each peak point current and each time to peak
Grade of difficulty sequence obtains the highest intereelectrode short-circuit failure of current limliting grade of difficulty and the secondary high intereelectrode short-circuit event of current limliting grade of difficulty
Barrier；
Emulation module, for using electromagnetic transient simulation model, to the highest intereelectrode short-circuit failure of current limliting grade of difficulty, limit
The high intereelectrode short-circuit failure of stream grade of difficulty time is emulated, and each discharge loop outlet in multiterminal flexible direct current distribution system is obtained
Current-limiting apparatus parameter value.
A technical solution in above-mentioned technical proposal is had the following advantages and beneficial effects:
Distribution system current-limiting method provided by the present application carries out subregion to distribution system, and confirms in each system partitioning
The corresponding short dot of intereelectrode short-circuit failure；When being occurred according to failure to the peak point current and peak value of the circuit of short dot electric discharge
Between, confirm the current limliting grade of difficulty of each intereelectrode short-circuit failure；It is short to the highest interpolar of current limliting grade of difficulty using the method for emulation
Road failure, the high intereelectrode short-circuit failure of current limliting grade of difficulty time are emulated, and obtain respectively putting in multiterminal flexible direct current distribution system
The current-limiting apparatus parameter value of electrical circuit outlet.The application goes to carry out current-limiting apparatus parameter value true from entire distribution system angle
Recognize, improves troubleshooting efficiency.
Detailed description of the invention
By reading a detailed description of non-restrictive embodiments in the light of the attached drawings below, the application's is other
Feature, objects and advantages will become more apparent upon:
Fig. 1 is the first schematic flow schematic diagram of distribution system current-limiting method in one embodiment；
Fig. 2 is the second schematic flow schematic diagram of distribution system current-limiting method in one embodiment；
Fig. 3 is the third schematic flow schematic diagram of distribution system current-limiting method in one embodiment；
Fig. 4 is the schematic block diagram of distribution system current-limiting apparatus in one embodiment；
Fig. 5 is distribution system failure subregion schematic diagram in a specific embodiment；
Fig. 6 is the fault equivalence circuit diagram in a specific embodiment under distribution system short trouble；
Fig. 7 is distribution system inverter discharge loop equivalent circuit schematic diagram in a specific embodiment；
Fig. 8 is distribution system commutator transformer discharge loop equivalent circuit schematic diagram in a specific embodiment；
Fig. 9 is the internal structure chart of computer equipment in one embodiment.
Specific embodiment
It is with reference to the accompanying drawings and embodiments, right in order to which the objects, technical solutions and advantages of the application are more clearly understood
The application is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain the application, not
For limiting the application.
In one embodiment, as shown in Figure 1, providing a kind of distribution system current-limiting method, comprising the following steps:
Step S110 obtains each intereelectrode short-circuit failure in multiterminal flexible direct current distribution system respectively, and obtains each discharge back
The peak point current on road and the time to peak of peak point current；Discharge loop is to the short dot electric discharge in intereelectrode short-circuit failure
Circuit.
Specifically, accident analysis is carried out to multiterminal flexible direct current distribution system, obtained in multiterminal flexible direct current distribution system
Intereelectrode short-circuit failure.According to intereelectrode short-circuit failure, the corresponding short dot of intereelectrode short-circuit failure is obtained, so that confirmation is to short dot
The discharge loop of electric discharge.Discharge loop is handled, obtain discharge loop peak point current and peak point current peak value when
Between.
Step S120 carries out current limliting difficulty to each intereelectrode short-circuit failure respectively according to each peak point current and each time to peak
Grade sequence obtains the highest intereelectrode short-circuit failure of current limliting grade of difficulty and the secondary high intereelectrode short-circuit failure of current limliting grade of difficulty.
Wherein, the current limliting grade of difficulty in step S120 is by breaker switch off time, the maximum electricity of discharge loop
The difference of stream and current limiting of breaker standard value embodies.
Specifically, according to obtained each peak point current and each time to peak, it is difficult current limliting can be carried out to intereelectrode short-circuit failure
The classification of degree.Current limliting grade of difficulty is ranked up, the highest intereelectrode short-circuit failure of current limliting grade of difficulty and current limliting difficulty are obtained
Etc. the high intereelectrode short-circuit failure of levels.
Step S130, it is difficult to the highest intereelectrode short-circuit failure of current limliting grade of difficulty, current limliting using electromagnetic transient simulation model
The high intereelectrode short-circuit failures of levels such as degree are emulated, and the limit of each discharge loop outlet in multiterminal flexible direct current distribution system is obtained
Flow device parameter value.
Wherein, the electromagnetic transient simulation model in step S130 can carry out structure by simulation softwares such as PSCAD/EMTDC
It builds.Current-limiting apparatus parameter is that can limit any device parameter of electric current, including current-limiting reactor, current-limiting resistance.
Using the electromagnetic transient simulation model having had been built up, respectively to the event of current limliting grade of difficulty highest intereelectrode short-circuit
Barrier, the high intereelectrode short-circuit failure of current limliting grade of difficulty time are emulated, and obtain respectively discharging back in multiterminal flexible direct current distribution system
The current-limiting apparatus parameter value of way outlet.
Above-mentioned distribution system current-limiting method carries out subregion to distribution system, and confirms intereelectrode short-circuit in each system partitioning
The corresponding short dot of failure；To the peak point current and time to peak of the circuit of short dot electric discharge when being occurred according to failure, confirmation is each
The current limliting grade of difficulty of intereelectrode short-circuit failure；Using the method for emulation, to the highest intereelectrode short-circuit failure of current limliting grade of difficulty, limit
The high intereelectrode short-circuit failure of stream grade of difficulty time is emulated, and each discharge loop outlet in multiterminal flexible direct current distribution system is obtained
Current-limiting apparatus parameter value.This method is gone to confirm current-limiting apparatus parameter value, be improved former from entire distribution system angle
Hinder treatment effeciency.
In one embodiment, as shown in Fig. 2, providing a kind of distribution system current-limiting method, comprising the following steps:
Step S210 obtains each intereelectrode short-circuit failure in multiterminal flexible direct current distribution system respectively, and obtains each discharge back
The peak point current on road and the time to peak of peak point current；Discharge loop is to the short dot electric discharge in intereelectrode short-circuit failure
Circuit.
Step S220 carries out current limliting difficulty to each intereelectrode short-circuit failure respectively according to each peak point current and each time to peak
Grade sequence obtains the highest intereelectrode short-circuit failure of current limliting grade of difficulty and the secondary high intereelectrode short-circuit failure of current limliting grade of difficulty.
Step S230, it is difficult to the highest intereelectrode short-circuit failure of current limliting grade of difficulty, current limliting using electromagnetic transient simulation model
The high intereelectrode short-circuit failures of levels such as degree are emulated, and the limit of each discharge loop outlet in multiterminal flexible direct current distribution system is obtained
Flow device parameter value.
Wherein, before the step of obtaining each intereelectrode short-circuit failure in multiterminal flexible direct current distribution system respectively, further includes:
Step S200, according to the configuration of the dc circuit breaker of multiterminal flexible direct current distribution system, Preservation tactics and key position,
Failure subregion, the pole for obtaining each system partitioning, and being analyzed to identify in each system partitioning are carried out to multiterminal flexible direct current distribution system
Between short trouble；
Specifically, Preservation tactics refer mainly to the locking of inverter and the movement of dc circuit breaker.After failure occurs, it is first
The converter blocking in guilty culprit region, followed by the movement of dc circuit breaker.
Distribution system is a complication system, it has multi-voltage grade, more device types and multi-load unit.Based on more
Dc circuit breaker configuration, Preservation tactics and the key position for holding flexible direct current distribution system, to multiterminal flexible direct current distribution system
Carry out failure subregion, the intereelectrode short-circuit failure for obtaining each system partitioning, and being analyzed to identify in each system partitioning.
Further, obtain each discharge loop peak point current and peak point current time to peak the step of, can wrap
It includes:
Equivalent process is carried out to discharge loop, obtains equivalent circuit；And equivalent circuit is handled, obtain peak point current and peak
It is worth the time.
Specifically, the method for obtaining the peak point current an of discharge loop and the time to peak of peak point current includes:
Equivalent transformation is done to discharge loop, obtains equivalent circuit, obtains peak point current and time to peak from the angle of equivalent circuit.It adopts
Meter can be facilitated from the theoretical peak point current for obtaining discharge loop and the time to peak of peak point current with the scheme of the application
It calculates machine equipment and carries out operation.In a specific example, discharge loop includes converter station discharge loop and commutator transformer electric discharge
Circuit.
Further, the step of handling equivalent circuit in the application, obtaining peak point current and time to peak, can wrap
It includes:
Equivalent process is carried out to converter station discharge loop and commutator transformer discharge loop respectively, obtains that converter station is equivalent to be put
Electrical circuit and the equivalent discharge loop of commutator transformer.
Specifically, carry out equivalent transformation to converter station discharge loop and commutator transformer discharge loop respectively, with one compared with
For simple circuitry instead primary circuit, the equivalent discharge loop of converter station and the equivalent discharge loop of commutator transformer are obtained.
Using the equivalent discharge loop of second-order circuit primary condition processing converter station, the equivalent discharge loop of commutator transformer, divide
The electric current of converter station discharge loop, the electric current of direct current transformer discharge loop are not obtained.
Specifically, the equivalent discharge loop of converter station and the equivalent discharge loop of commutator transformer are second order discharge circuit, according to
Second-order circuit primary condition, the electricity of the equivalent discharge loop of electric current, commutator transformer of the available equivalent discharge loop of converter station
Stream.
The electric current of electric current, direct current transformer discharge loop based on converter station discharge loop, obtains converter station discharge loop
Current curve diagram, direct current transformer discharge loop current curve diagram.
Specifically, according to the available change of current of electric current of the electric current of converter station discharge loop, direct current transformer discharge loop
It stands the current curve diagram of discharge loop, the current curve diagram of direct current transformer discharge loop.
According to the current curve diagram of converter station discharge loop, Peak current, the time to peak of converter station discharge loop are obtained；
According to the current curve diagram of direct current transformer discharge loop, Peak current, the time to peak of direct current transformer discharge loop are obtained.
Specifically, obtaining the Peak current of discharge loop, the method for time to peak may include: to read in current curve diagram
Out, it is derived from formula.In a specific example, the peak of discharge loop can be obtained by the way of current curve diagram
It is worth circuit, time to peak.In the current curve diagram of converter station discharge loop, the peak of converter station discharge loop can be directly read
It is worth circuit, time to peak；In the current curve diagram of direct current transformer discharge loop, converter station discharge loop can be directly read
Peak current, time to peak.
It should be noted that using the equivalent discharge loop of second-order circuit primary condition processing converter station, commutator transformer etc.
In the step of imitating discharge loop, respectively obtaining the electric current of the electric current of converter station discharge loop, direct current transformer discharge loop, it is based on
Following formula obtains the peak point current of converter station discharge loop:
Wherein, I1For the electric current of converter station discharge loop；ω is the oscillation angular frequency of the equivalent discharge loop of converter station；δ is
The time constant of the equivalent discharge loop of converter station；UdcFor direct current voltage across poles；I0For DC bus current；L is that converter station is equivalent
The equivalent inductance of discharge loop；ω0For the resonance angular frequency of the equivalent discharge loop of converter station.
Based on following formula, the peak point current of direct current transformer discharge loop is obtained:
Wherein, I2For the electric current of converter station discharge loop；ω1For the oscillation angular frequency of the equivalent discharge loop of direct current transformer；
δ1For the time constant of the equivalent discharge loop of direct current transformer；UdcFor direct current voltage across poles；I0For DC bus current；L1It is straight
The equivalent inductance of the equivalent discharge loop of galvanic electricity depressor；ω2For the resonance angular frequency of the equivalent discharge loop of direct current transformer.
In a specific embodiment, according to each peak point current and each time to peak, respectively to each intereelectrode short-circuit failure
The sequence of current limliting grade of difficulty is carried out, the highest intereelectrode short-circuit failure of current limliting grade of difficulty and the secondary high pole of current limliting grade of difficulty are obtained
Between short trouble the step of, may include:
By the drop-out current value of breaker, does and subtract with the maximum current value of the discharge loop in the switch off time of breaker
Method obtains difference；Breaker is nearest apart from intereelectrode short-circuit failure and makes intereelectrode short-circuit failure and multiterminal flexible direct current power distribution system
The breaker of system isolation；Wherein, if time to peak is less than or equal to switch off time, maximum current value is the value of peak point current；If
Time to peak is greater than switch off time, and maximum current value is the current value to discharge loop at the end of switch off time.
Specifically, intereelectrode short-circuit failure can be obtained in multiterminal flexible direct current distribution system according to system protection strategy
Corresponding breaker.System protection strategy regulation, corresponding breaker be apart from intereelectrode short-circuit failure recently, can failure from
The breaker that multiterminal flexible direct current distribution system isolates.
When the time to peak of discharge loop is less than or equal to the switch off time of breaker, discharge loop is opened short in breaker
Maximum current value in time is the current peak of the discharge loop.When the time to peak of discharge loop is greater than cut-offfing for breaker
Time, maximum current value of the discharge loop in breaker opens the short time are current value at the end of switch off time.It will be breaking
Maximum current value of the drop-out current value and discharge loop of device in switch off time does subtraction, obtains difference.
According to the size order of each difference, the current limliting grade of difficulty sequence of each intereelectrode short-circuit failure is obtained.
Specifically, obtained difference is ranked up.In a specific example, it is ranked up using size order, it is poor
The size of value corresponds to the height of the current limliting grade of difficulty of intereelectrode short-circuit failure, and difference is bigger, and the current limliting of intereelectrode short-circuit failure is difficult
Spend the higher of grade.
Further, difficult to the highest intereelectrode short-circuit failure of current limliting grade of difficulty, current limliting using electromagnetic transient simulation model
The step of high intereelectrode short-circuit failures of levels such as degree are emulated, comprising:
Establish electromagnetic transient simulation model.
Specifically, electromagnetic transient simulation model can be constructed by simulation software, including PSCAD, EMTDC.It is specific at one
In example, electromagnetic transient simulation model is established using PSCAD software.
Based on electromagnetic transient simulation model, the corresponding electric discharge of the highest intereelectrode short-circuit failure of current limliting grade of difficulty is gradually improved
Current-limiting reactor value at circuit outlet, until the maximum current value of each discharge loop is respectively less than the first current limliting standard current value.
Specifically, current limliting parameter value may include current-limiting reactor value.It is highest to current limliting grade of difficulty in simulation model
Intereelectrode short-circuit failure is emulated, and gradually improves the current-limiting reactor value in the corresponding discharge loop exit of intereelectrode short-circuit failure,
Until the maximum current value of each discharge loop is all less than the first current limliting standard current value.
Based on electromagnetic transient simulation model, the high corresponding electric discharge of intereelectrode short-circuit failure of current limliting grade of difficulty time is gradually improved
Current-limiting reactor value at circuit outlet, until the maximum current value of each discharge loop is respectively less than the second current limliting standard current value.
Specifically, being emulated to the high intereelectrode short-circuit failure of current limliting grade of difficulty time, and gradually mention in simulation model
The current-limiting reactor value in the corresponding discharge loop exit of high intereelectrode short-circuit failure, until the maximum current value of each discharge loop is whole
Less than the second current limliting standard current value.
It should be noted that the first current limliting standard current value is that drop-out current value and the highest interpolar of current limliting grade of difficulty are short
The quotient of the number of the corresponding discharge loop of road failure；
Second current limliting standard current value is that drop-out current value is corresponding with the high intereelectrode short-circuit failure of current limliting grade of difficulty time
The quotient of the number of discharge loop.
Specifically, current limliting standard current value is breaker drop-out current value discharge loop corresponding with intereelectrode short-circuit failure
The quotient of number.First current limliting standard current value is that drop-out current value is corresponding with the highest intereelectrode short-circuit failure of current limliting grade of difficulty
The quotient of the number of discharge loop；Second current limliting standard current value is drop-out current value and the secondary high intereelectrode short-circuit of current limliting grade of difficulty
The quotient of the number of the corresponding discharge loop of failure.
In above-mentioned distribution system current-limiting method, according to the configuration of the dc circuit breaker of multiterminal flexible direct current distribution system, protect
Shield strategy and key position carry out failure subregion to multiterminal flexible direct current distribution system, and are analyzed to identify in each system partitioning
Intereelectrode short-circuit failure, the intereelectrode short-circuit failure capableing of in the confirmation system partitioning of architecture.It is obtained by the way of equivalent process
The electric current of converter station discharge loop, the electric current of direct current transformer discharge loop are obtained, required data can be theoretically obtained, side
Just computer equipment carries out operation.The Peak current and peak of converter station discharge loop are respectively obtained by the way of current curve diagram
It is worth the Peak current and time to peak of time, direct current transformer discharge loop, operation simplerization of data can be made.
In one embodiment, as shown in figure 3, providing a kind of distribution system current-limiting method, comprising the following steps:
Step S310 obtains each intereelectrode short-circuit failure in multiterminal flexible direct current distribution system respectively, and obtains each discharge back
The peak point current on road and the time to peak of peak point current；Discharge loop is to the short dot electric discharge in intereelectrode short-circuit failure
Circuit.
Step S320 carries out current limliting difficulty to each intereelectrode short-circuit failure respectively according to each peak point current and each time to peak
Grade sequence obtains the highest intereelectrode short-circuit failure of current limliting grade of difficulty and the secondary high intereelectrode short-circuit failure of current limliting grade of difficulty.
Step S330, it is difficult to the highest intereelectrode short-circuit failure of current limliting grade of difficulty, current limliting using electromagnetic transient simulation model
The high intereelectrode short-circuit failures of levels such as degree are emulated, and the limit of each discharge loop outlet in multiterminal flexible direct current distribution system is obtained
Flow device parameter value.
Wherein, electromagnetic transient simulation model is being used, to the highest intereelectrode short-circuit failure of current limliting grade of difficulty, current limliting difficulty
Etc. the high intereelectrode short-circuit failure of levels emulated, obtain discharge loop outlet current-limiting apparatus parameter value the step of after, also
Include:
Step S340 carries out school in the intereelectrode short-circuit failure of remaining current limliting grade of difficulty using current-limiting apparatus parameter value
It tests；The intereelectrode short-circuit failure of remaining current limliting grade of difficulty is to remove current limliting grade of difficulty highest in multiterminal flexible direct current distribution system
Intereelectrode short-circuit failure, the intereelectrode short-circuit failure other than the high intereelectrode short-circuit failure of current limliting grade of difficulty time.
Specifically, after the current-limiting apparatus parameter value for obtaining discharge loop outlet, it is also necessary to current-limiting apparatus parameter value
It is verified.In a specific example, the intereelectrode short-circuit of simulation residual current limliting grade of difficulty in electromagnetic transient simulation model
Failure verifies whether maximum current value of each discharge loop in switch off time is less than limit using obtained current-limiting apparatus parameter
Flow standard value.The intereelectrode short-circuit failure of remaining current limliting grade of difficulty is in multiterminal flexible direct current distribution system, except current limliting difficulty etc.
Intereelectrode short-circuit failure other than the high intereelectrode short-circuit failure of the highest intereelectrode short-circuit failure of grade, current limliting grade of difficulty time.
When the result of verification is failure, using electromagnetic transient simulation model, to the interpolar of the residue current limliting grade of difficulty
Short trouble is emulated.
Specifically, repeating step S330 in the case where verifying failure, the intereelectrode short-circuit failure of verification failure is imitated
Very, corresponding discharge loop outlet current limliting parameter value is improved until the maximum current value of each discharge loop is all less than current limliting standard
Current value.
Above-mentioned distribution system current-limiting method obtains the corresponding breaker of intereelectrode short-circuit failure according to system protection strategy, and
According to the quantity of the drop-out current of breaker and the corresponding discharge loop of failure, current limliting standard current value is proposed.Pass through current limliting
The comparison of the maximum current value of standard value and each discharge loop in breaker switch off time, by the current limliting of each intereelectrode short-circuit failure
Grade of difficulty theoretical can be decided.The current-limiting apparatus parameter value of discharge loop outlet is obtained using magnetic Transient simulation model
Later, obtained current-limiting apparatus parameter value is verified in the intereelectrode short-circuit failure of remaining current limliting grade of difficulty, is further mentioned
The high reliability of current-limiting apparatus parameter value.
In one embodiment, as shown in figure 4, providing a kind of distribution system current-limiting apparatus, comprising:
Data acquisition module 410 for obtaining each intereelectrode short-circuit failure in multiterminal flexible direct current distribution system respectively, and obtains
Take the peak point current of each discharge loop and the time to peak of peak point current；Discharge loop is to short in intereelectrode short-circuit failure
The circuit of waypoint electric discharge.
Sorting module 420, for being limited each intereelectrode short-circuit failure respectively according to each peak point current and each time to peak
Grade of difficulty sequence is flowed, the highest intereelectrode short-circuit failure of current limliting grade of difficulty and the secondary high intereelectrode short-circuit of current limliting grade of difficulty are obtained
Failure.
Emulation module 430, for using electromagnetic transient simulation model, to the event of current limliting grade of difficulty highest intereelectrode short-circuit
Barrier, the high intereelectrode short-circuit failure of current limliting grade of difficulty time are emulated, and obtain respectively discharging back in multiterminal flexible direct current distribution system
The current-limiting apparatus parameter value of way outlet.
In a specific embodiment, distribution system current-limiting apparatus further includes failure analysis module, for soft according to multiterminal
Property the dc circuit breaker configuration of direct-flow distribution system, Preservation tactics and key position, multiterminal flexible direct current distribution system is carried out
Failure subregion obtains each system partitioning, and the intereelectrode short-circuit failure being analyzed to identify in each system partitioning.
In a specific example, data acquisition module is also used to, and is carried out equivalent process to discharge loop, is obtained equivalent electricity
Road；And equivalent circuit is handled, obtain peak point current and time to peak.Discharge loop includes that converter station discharge loop and direct current become
Depressor discharge loop.
Specifically, data acquisition module is also used to:
Equivalent process is carried out to converter station discharge loop and commutator transformer discharge loop respectively, obtains that converter station is equivalent to be put
Electrical circuit and the equivalent discharge loop of commutator transformer；
Using the equivalent discharge loop of second-order circuit primary condition processing converter station, the equivalent discharge loop of commutator transformer, divide
The electric current of converter station discharge loop, the electric current of direct current transformer discharge loop are not obtained；
The electric current of electric current, direct current transformer discharge loop based on converter station discharge loop, obtains converter station discharge loop
Current curve diagram, direct current transformer discharge loop current curve diagram；
According to the current curve diagram of converter station discharge loop, Peak current, the time to peak of converter station discharge loop are obtained；
According to the current curve diagram of direct current transformer discharge loop, Peak current, the time to peak of direct current transformer discharge loop are obtained.
In a specific embodiment, sorting module is also used to:
By the drop-out current value of breaker, does and subtract with the maximum current value of the discharge loop in the switch off time of breaker
Method obtains difference；Breaker is nearest apart from intereelectrode short-circuit failure and makes intereelectrode short-circuit failure and multiterminal flexible direct current power distribution system
The breaker of system isolation；Wherein, if time to peak is less than or equal to switch off time, maximum current value is the value of peak point current；If
Time to peak is greater than switch off time, and maximum current value is the current value to discharge loop at the end of switch off time；
According to the size order of each difference, the current limliting grade of difficulty sequence of each intereelectrode short-circuit failure is obtained.
In a specific embodiment, emulation module is also used to:
Establish electromagnetic transient simulation model；
Based on electromagnetic transient simulation model, the corresponding electric discharge of the highest intereelectrode short-circuit failure of current limliting grade of difficulty is gradually improved
Current-limiting reactor value at circuit outlet, until the maximum current value of each discharge loop is respectively less than the first current limliting standard current value；
Based on electromagnetic transient simulation model, the high corresponding electric discharge of intereelectrode short-circuit failure of current limliting grade of difficulty time is gradually improved
Current-limiting reactor value at circuit outlet, until the maximum current value of each discharge loop is respectively less than the second current limliting standard current value.
Wherein, emulation module is also used to calculate current limliting standard current value.Current limliting standard current value is drop-out current value and pole
Between the corresponding discharge loop of short trouble number quotient.
Wherein, further include correction verification module, in the intereelectrode short-circuit failure of remaining current limliting grade of difficulty, to current-limiting apparatus
Parameter value is verified；The intereelectrode short-circuit failure of remaining current limliting grade of difficulty is to remove current limliting in multiterminal flexible direct current distribution system
Intereelectrode short-circuit failure other than the high intereelectrode short-circuit failure of the highest intereelectrode short-circuit failure of grade of difficulty, current limliting grade of difficulty time；
It is short to the interpolar of remaining current limliting grade of difficulty using electromagnetic transient simulation model when the result of verification is failure
Road failure is emulated.
The specific restriction of current-limiting apparatus about distribution system may refer to above for distribution system current-limiting method
It limits, details are not described herein.Modules in the current-limiting apparatus of above-mentioned distribution system can be fully or partially through software, hardware
And combinations thereof realize.Above-mentioned each module can be embedded in the form of hardware or independently of in the processor in computer equipment,
It can be stored in a software form in the memory in computer equipment, execute the above modules pair in order to which processor calls
The operation answered.
In order to further illustrate application scheme, the various embodiments described above are said below with reference to a specific example
It is bright.
The three end flexible direct current distribution systems that the application uses, design parameter are as shown in table 1.
1 flexible direct current distribution system converter station parameter of table
According to the configuration of multiterminal flexible direct current distribution system dc circuit breaker, Preservation tactics and key position, to multiterminal flexibility
Direct-flow distribution system carries out failure subregion, analyzes the typical intereelectrode short-circuit failure that may occur in each region, summarizes each pole
Between the corresponding movement dc circuit breaker of short trouble.
Fig. 5 is distribution system failure subregion schematic diagram, as shown in figure 5, intereelectrode short-circuit failure is by system protection in each region
Strategy is it is found that acting dc circuit breaker for isolated fault, under F1, F2 failure is DCB1；Direct current interruption is acted under F3, F4 failure
Device is DCB3；It is DCB2, DCB4 and DCB5 that dc circuit breaker is acted under F5, F7 failure；Dc circuit breaker is acted under F6 failure is
DCB5；It is DCB4 that dc circuit breaker is acted under F8 failure.
Typical intereelectrode short-circuit failure F2 is chosen, analysis fault equivalence circuit is as shown in Figure 6, it is known that intereelectrode short-circuit failure occurs
Afterwards, 2 submodule capacitor of converter station, 3 submodule capacitor of converter station and commutator transformer high-pressure side electric capacity of voltage regulation are put to short dot
Electricity.
Each converter station and commutator transformer are considered as independent loop to short dot discharge loop, which can wait
Effect is second order discharge circuit.Inverter discharge loop is as shown in Figure 7, it is known that bridge arm inductance L0, submodule capacitance C0, then failure
Circuit equivalent inductance L is 2/3L0With line equivalent inductance LXThe sum of, equivalent capacity C isEquivalent resistance R is power electronics device
Part on-state and switching loss substitutional resistance Rf, shorted contacts resistance Rs, dc circuit breaker conducting resistance RdAnd DC line is equivalent
Resistance RXThe sum of.Commutator transformer discharge loop is as shown in figure 8, equivalent capacity C2For commutator transformer high-pressure side electric capacity of voltage regulation, etc.
Imitate resistance L1For stray inductance, equivalent resistance R1For shorted contacts resistance Rs, direct current cables line equivalent resistance RL, direct current interruption
Device conducting resistance RdThe sum of.Discharge loop electric current calculation formula can be obtained by second-order circuit primary condition:
It should be noted that the electricity of the current formula of converter station discharge loop hereinbefore, direct current transformer discharge loop
Formula and this formula not contradiction are flowed, is meant that being consistent for adaptability in formula expressed by letter.In this formula
In, ω is the oscillation angular frequency of discharge loop；δ is the time constant of discharge loop, UdcFor direct current voltage across poles, I0For direct current mother
Line current, L are the equivalent inductance of discharge loop, ω0For the resonance angular frequency of discharge loop, β is the first phase of triangulate decomposition method.
Known to:
Wherein, Udc=20kV, I0=1.0kA.
I as available from the above equation2Current peak is 8.58kA, time to peak 3.4ms；I3Current peak is 7.81kA, when peak value
Between be 3.4ms；I4Current peak is 58.76kA, time to peak 4.7ms.
According to the discharge current number for flowing through dc circuit breaker under the connecting-disconnecting function of dc circuit breaker and the failure, to each
Discharge loop proposes current limliting requirement, and analyzes its current limliting difficulty:
The dc circuit breaker that known this system uses can cut-off the short circuit current within 10kA, the failure feelings in 3ms
Under condition, discharge current superposition of the dc circuit breaker fault current from three discharge loops, it is therefore assumed that each discharge loop is electric
Stream peak value all should be less than 3.33kA, and current limliting difficulty is connected to the fault-signal that protection issues in dc circuit breaker by each discharge loop
And the current peak in the 3ms after acting and the difference between current limliting standard embody.
In this system, it is known that protection identification failure simultaneously issues the time that signal needs 2ms, and therefore, current limliting scheme should meet
It flows through and is respectively less than its maximum drop-out current in the 5ms of the electric current of dc circuit breaker after the failure occurred.I.e. under F2 failure, current limliting
Reactance should ensure that the current peak of each discharge loop in failure generation 5ms should be less than 3.33kA.
Similarly determine the peak point current and time to peak of each discharge current of other typical intereelectrode short-circuit failures.
The current limliting difficulty of dc circuit breaker fault current under all kinds of typical faults and each discharge loop is compared and analyzed,
The maximum F3 failure of current limliting difficulty is chosen first comes simulation calculation converter station 1 and the outlet of converter station 2 and commutator transformer high pressure
The current-limiting reactor parameter of side outlet；The current-limiting reactor that the F2 failure taken second place again by current limliting difficulty exports come simulation calculation converter station 3
Device value, finally can checking current-limiting reactor parameter by remaining a few class failure meet the requirements.
Multiterminal flexible direct current distribution system electromagnetic transient simulation model is established in PSCAD, is filled according to the current limliting that S7 is proposed
Set parameter-calculation sequence, simulation calculation and the current-limiting apparatus parameter for determining each position of system.
I.e. first under F3 failure, while emulating determining converter station 1, converter station 2 and commutator transformer high pressure side outlet
Current-limiting reactor parameter gradually improves current-limiting reactor value, until can be by the loop fault current limit in 3.33kA or less
?.For simulation process by taking converter station 1 as an example, the simulation calculation process for exporting current-limiting reactor is as shown in table 2.
2 converter station 1 of table exports current-limiting reactor configuration and its discharge current I1
Similarly, the current limliting parameter value of other system partitioning outlets is obtained.Obtain the current limliting scheme that simulation result determines are as follows: change
1 outlet of stream station installs every pole 13mH current-limiting reactor additional, the outlet of converter station 2 installs every pole 13mH current-limiting reactor additional, and the outlet of converter station 3 installs additional
Every pole 9mH reactance, commutator transformer high pressure side outlet install every pole 15mH current-limiting reactor additional.
In addition, the technical solution of the application can also acquire the current value for flowing through DCB1, the electric current I of DCB1 is flowed throughDCB1For
2 submodule capacitance discharge current I of converter station2, 3 submodule capacitance discharge current I of converter station3And commutator transformer high-pressure side is steady
Voltage capacitance discharge current I4Superposition, ignore influencing each other for each capacitor, obtained independent loop electric current be overlapped mutually, is obtained
The fault current I of dc circuit breaker DCB1 is flowed through under the short trouble to Multi-port direct-current distribution systemDCB1Peak value is 73.85,
Time to peak is 4.4ms.It, can be with assistant analysis intereelectrode short-circuit failure according to the fault curre for flowing through dc circuit breaker DCB1
Current limliting difficulty.
In one embodiment, a kind of computer equipment is provided, which can be terminal, internal structure
Figure can be as shown in Figure 9.The computer equipment includes processor, the memory, network interface, display connected by system bus
Screen and input unit.Wherein, the processor of the computer equipment is for providing calculating and control ability.The computer equipment is deposited
Reservoir includes non-volatile memory medium, built-in storage.The non-volatile memory medium is stored with operating system and computer journey
Sequence.The built-in storage provides environment for the operation of operating system and computer program in non-volatile memory medium.The calculating
The network interface of machine equipment is used to communicate with external terminal by network connection.When the computer program is executed by processor with
Realize a kind of distribution system current-limiting method.The display screen of the computer equipment can be liquid crystal display or electric ink is shown
Screen, the input unit of the computer equipment can be the touch layer covered on display screen, be also possible on computer equipment shell
Key, trace ball or the Trackpad of setting can also be external keyboard, Trackpad or mouse etc..
It will be understood by those skilled in the art that structure shown in Fig. 9, only part relevant to application scheme is tied
The block diagram of structure does not constitute the restriction for the computer equipment being applied thereon to application scheme, specific computer equipment
It may include perhaps combining certain components or with different component layouts than more or fewer components as shown in the figure.
In one embodiment, a kind of computer equipment, including memory and processor are provided,
Computer program is stored in memory, which performs the steps of when executing computer program
Each intereelectrode short-circuit failure in multiterminal flexible direct current distribution system is obtained respectively, and obtains the peak value electricity of each discharge loop
The time to peak of stream and peak point current；Discharge loop is the circuit to the short dot electric discharge in intereelectrode short-circuit failure；
According to each peak point current and each time to peak, the sequence of current limliting grade of difficulty is carried out to each intereelectrode short-circuit failure respectively,
Obtain the highest intereelectrode short-circuit failure of current limliting grade of difficulty and the secondary high intereelectrode short-circuit failure of current limliting grade of difficulty；
Using electromagnetic transient simulation model, to the highest intereelectrode short-circuit failure of current limliting grade of difficulty, current limliting grade of difficulty
High intereelectrode short-circuit failure is emulated, and the current-limiting apparatus ginseng of each discharge loop outlet in multiterminal flexible direct current distribution system is obtained
Numerical value.
Those of ordinary skill in the art will appreciate that realizing all or part of the process in above-described embodiment method, being can be with
Relevant hardware is instructed to complete by computer program, the computer program can be stored in a non-volatile computer
In read/write memory medium, the computer program is when being executed, it may include such as the process of the embodiment of above-mentioned each method.Wherein,
To any reference of memory, storage, database or other media used in each embodiment provided herein,
Including non-volatile and/or volatile memory.Nonvolatile memory may include read-only memory (ROM), programming ROM
(PROM), electrically programmable ROM (EPROM), electrically erasable ROM (EEPROM) or flash memory.Volatile memory may include
Random access memory (RAM) or external cache.By way of illustration and not limitation, RAM is available in many forms,
Such as static state RAM (SRAM), dynamic ram (DRAM), synchronous dram (SDRAM), double data rate sdram (DDRSDRAM), enhancing
Type SDRAM (ESDRAM), synchronization link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM
(RDRAM), direct memory bus dynamic ram (DRDRAM) and memory bus dynamic ram (RDRAM) etc..
Each technical characteristic of above embodiments can be combined arbitrarily, for simplicity of description, not to above-described embodiment
In each technical characteristic it is all possible combination be all described, as long as however, the combination of these technical characteristics be not present lance
Shield all should be considered as described in this specification.
Above embodiments only express the several embodiments of the application, and the description thereof is more specific and detailed, but can not
Therefore it is construed as limiting the scope of the patent.It should be pointed out that for those of ordinary skill in the art,
Under the premise of not departing from the application design, various modifications and improvements can be made, these belong to the protection scope of the application.
Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of distribution system current-limiting method, which comprises the following steps:
Respectively obtain multiterminal flexible direct current distribution system in each intereelectrode short-circuit failure, and obtain each discharge loop peak point current,
And the time to peak of the peak point current；The discharge loop is returning to the short dot electric discharge in the intereelectrode short-circuit failure
Road；
According to each peak point current and each time to peak, current limliting difficulty etc. is carried out to each intereelectrode short-circuit failure respectively
Grade sequence obtains the highest intereelectrode short-circuit failure of current limliting grade of difficulty and the secondary high intereelectrode short-circuit failure of current limliting grade of difficulty；
Using electromagnetic transient simulation model, to the highest intereelectrode short-circuit failure of the current limliting grade of difficulty, described current limliting difficulty etc.
The high intereelectrode short-circuit failure of level is emulated, and the limit of each discharge loop outlet in the multiterminal flexible direct current distribution system is obtained
Flow device parameter value.
2. distribution system current-limiting method according to claim 1, which is characterized in that obtain multiterminal flexible direct current distribution respectively
In system the step of each intereelectrode short-circuit failure before, further comprise the steps of:
According to the configuration of the dc circuit breaker of the multiterminal flexible direct current distribution system, Preservation tactics and key position, to described more
Flexible direct current distribution system is held to carry out failure subregion, the institute for obtaining each system partitioning, and being analyzed to identify in each system partitioning
State intereelectrode short-circuit failure；
Obtain each discharge loop peak point current and the peak point current time to peak the step of, comprising:
Equivalent process is carried out to the discharge loop, obtains equivalent circuit；And the equivalent circuit is handled, obtain the peak value electricity
Stream and the time to peak.
3. distribution system current-limiting method according to claim 2, which is characterized in that the discharge loop includes that converter station is put
Electrical circuit and commutator transformer discharge loop；
The step of handling the equivalent circuit, obtaining the peak point current and the time to peak, comprising:
Equivalent process is carried out to the converter station discharge loop and the commutator transformer discharge loop respectively, obtains converter station etc.
Imitate discharge loop and the equivalent discharge loop of commutator transformer；
Handle that the equivalent discharge loop of the converter station, the commutator transformer is equivalent discharges back using second-order circuit primary condition
Road respectively obtains the electric current of the converter station discharge loop, the electric current of the direct current transformer discharge loop；
The electric current of electric current, the direct current transformer discharge loop based on the converter station discharge loop, obtains the converter station
The current curve diagram of the current curve diagram of discharge loop, the direct current transformer discharge loop；
According to the current curve diagram of the converter station discharge loop, Peak current, the peak value of the converter station discharge loop are obtained
Time；According to the current curve diagram of the direct current transformer discharge loop, the peak value of the direct current transformer discharge loop is obtained
Circuit, time to peak.
4. distribution system current-limiting method according to claim 3, which is characterized in that handled using second-order circuit primary condition
The equivalent discharge loop of the converter station, the equivalent discharge loop of the commutator transformer, respectively obtain the converter station discharge loop
Electric current, the direct current transformer discharge loop electric current the step of in, be based on following formula, obtain the converter station and discharge back
The peak point current on road:
Wherein, I1For the electric current of the converter station discharge loop；ω is the oscillation angular frequency of the equivalent discharge loop of the converter station；δ
For the time constant of the equivalent discharge loop of the converter station；UdcFor direct current voltage across poles；I0For DC bus current；L is described
The equivalent inductance of the equivalent discharge loop of converter station；ω0For the resonance angular frequency of the equivalent discharge loop of the converter station.
5. distribution system current-limiting method according to claim 3, which is characterized in that handled using second-order circuit primary condition
The equivalent discharge loop of the converter station, the equivalent discharge loop of the commutator transformer, respectively obtain the converter station discharge loop
Electric current, the direct current transformer discharge loop electric current the step of in, be based on following formula, obtain the direct current transformer and put
The peak point current of electrical circuit:
Wherein, I2For the electric current of the converter station discharge loop；ω1For the hunting angle of the equivalent discharge loop of the direct current transformer
Frequency；δ1For the time constant of the equivalent discharge loop of the direct current transformer；UdcFor direct current voltage across poles；I0For DC bus electricity
Stream；L1For the equivalent inductance of the equivalent discharge loop of the direct current transformer；ω2For the equivalent discharge loop of the direct current transformer
Resonance angular frequency.
6. distribution system current-limiting method according to claim 1, which is characterized in that according to each peak point current and each institute
Time to peak is stated, the sequence of current limliting grade of difficulty is carried out to each intereelectrode short-circuit failure respectively, obtains current limliting grade of difficulty highest
Intereelectrode short-circuit failure and current limliting grade of difficulty time high intereelectrode short-circuit failure the step of, comprising:
By the drop-out current value of breaker, the maximum current value with the discharge loop in the switch off time of the breaker
Subtraction is done, difference is obtained；The breaker for apart from the intereelectrode short-circuit failure recently and make the intereelectrode short-circuit failure and institute
State the breaker of multiterminal flexible direct current distribution system isolation；Wherein, if the time to peak is less than or equal to the switch off time,
The maximum current value is the value of the peak point current；If the time to peak is greater than the switch off time, the maximum current
Value is the current value to the discharge loop at the end of switch off time；
According to the size order of each difference, the current limliting grade of difficulty sequence of each intereelectrode short-circuit failure is obtained.
7. distribution system current-limiting method according to claim 6, which is characterized in that the current-limiting apparatus parameter value includes limit
Flow reactance value；
Using electromagnetic transient simulation model, to the highest intereelectrode short-circuit failure of the current limliting grade of difficulty, described current limliting difficulty etc.
The step of high intereelectrode short-circuit failure of level is emulated, comprising:
Establish the electromagnetic transient simulation model；
Based on the electromagnetic transient simulation model, it is corresponding gradually to improve the highest intereelectrode short-circuit failure of the current limliting grade of difficulty
The current-limiting reactor value in discharge loop exit, until the maximum current value of each discharge loop is respectively less than the first current limliting standard electric
Flow valuve；
Based on the electromagnetic transient simulation model, it is corresponding gradually to improve the high intereelectrode short-circuit failure of the current limliting grade of difficulty time
The current-limiting reactor value in discharge loop exit, until the maximum current value of each discharge loop is respectively less than the second current limliting standard electric
Flow valuve.
8. distribution system current-limiting method according to claim 7, which is characterized in that
The first current limliting standard current value is the drop-out current value and the highest intereelectrode short-circuit event of the current limliting grade of difficulty
Hinder the quotient of the number of corresponding discharge loop；
The second current limliting standard current value is the drop-out current value, the intereelectrode short-circuit event high with the current limliting grade of difficulty time
Hinder the quotient of the number of corresponding discharge loop.
9. distribution system current-limiting method according to claim 1, which is characterized in that electromagnetic transient simulation model is being used,
The highest intereelectrode short-circuit failure of the current limliting grade of difficulty, the high intereelectrode short-circuit failure of the current limliting grade of difficulty time are imitated
Very, it after the step of obtaining the current-limiting apparatus parameter value of the discharge loop outlet, further comprises the steps of:
Using the current-limiting apparatus parameter value, verified in the intereelectrode short-circuit failure of remaining current limliting grade of difficulty；It is described surplus
The intereelectrode short-circuit failure of remaining current limliting grade of difficulty is in the multiterminal flexible direct current distribution system, most except the current limliting grade of difficulty
Intereelectrode short-circuit failure other than time high intereelectrode short-circuit failure of high intereelectrode short-circuit failure, the current limliting grade of difficulty；
When the result of the verification is failure, using the electromagnetic transient simulation model, to the remaining current limliting grade of difficulty
Intereelectrode short-circuit failure emulated.
10. a kind of distribution system current-limiting apparatus characterized by comprising
Data acquisition module for obtaining each intereelectrode short-circuit failure in multiterminal flexible direct current distribution system respectively, and is obtained and is respectively put
The time to peak of the peak point current of electrical circuit and the peak point current；The discharge loop is to the intereelectrode short-circuit failure
In short dot electric discharge circuit；
Sorting module is used for according to each peak point current and each time to peak, respectively to each intereelectrode short-circuit failure
The sequence of current limliting grade of difficulty is carried out, the highest intereelectrode short-circuit failure of current limliting grade of difficulty and the secondary high pole of current limliting grade of difficulty are obtained
Between short trouble；
Emulation module, for using electromagnetic transient simulation model, to the highest intereelectrode short-circuit failure of the current limliting grade of difficulty, institute
It states the high intereelectrode short-circuit failure of current limliting grade of difficulty time to be emulated, obtains respectively discharging in the multiterminal flexible direct current distribution system
The current-limiting apparatus parameter value of circuit outlet.
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| CN112421591A (en) * | 2020-09-29 | 2021-02-26 | 国网福建省电力有限公司电力科学研究院 | Low-voltage current-limiting fixed value adjusting method for restraining flexible direct current near-zone three-phase short-circuit current |
| CN112421591B (en) * | 2020-09-29 | 2024-01-30 | 国网福建省电力有限公司电力科学研究院 | Low-voltage current-limiting fixed value adjusting method for inhibiting flexible direct-current near-zone three-phase short-circuit current |
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