CN109066600B - A kind of current limliting capacitance-resistance branch, resistance-capacitance type dc circuit breaker and parameter selection method - Google Patents
A kind of current limliting capacitance-resistance branch, resistance-capacitance type dc circuit breaker and parameter selection method Download PDFInfo
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- CN109066600B CN109066600B CN201810867113.XA CN201810867113A CN109066600B CN 109066600 B CN109066600 B CN 109066600B CN 201810867113 A CN201810867113 A CN 201810867113A CN 109066600 B CN109066600 B CN 109066600B
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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
- H02H7/10—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 for converters; for rectifiers
- H02H7/12—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 for converters; for rectifiers for static converters or rectifiers
- H02H7/125—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 for converters; for rectifiers for static converters or rectifiers for rectifiers
-
- 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
- H02H7/10—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 for converters; for rectifiers
- H02H7/12—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 for converters; for rectifiers for static converters or rectifiers
- H02H7/122—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 for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- Power Engineering (AREA)
- Inverter Devices (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of current limliting capacitance-resistance branch, resistance-capacitance type dc circuit breaker and parameter selection methods suitable for flexible HVDC transmission system.The current limliting capacitance-resistance branch, contains the first sub-circuit and the second sub-circuit；On the basis of current limliting capacitance-resistance branch, current-carrying disjunction branch is increased, the resistance-capacitance type dc circuit breaker proposed by the present invention of composition, meanwhile, for current limliting capacitance-resistance branch, each component of current-carrying disjunction branch, propose the configuration method of parameter.Through the invention, direct current overcurrent, stable DC voltage can be inhibited after DC line fault, connecting-disconnecting function is strong, improves ac and dc systems stability and reliability.
Description
Technical field
The present invention relates to high-voltage dc transmission electrical domain more particularly to a kind of current limliting capacitance-resistance branches, resistance-capacitance type dc circuit breaker
And parameter selection method.
Background technique
Flexible HVDC transmission system (voltage source converter based based on voltage source converter
High voltage direct current, VSC-HVDC) there is significant advantage on solving the problems, such as new energy consumption.But by
Overcurrent, the overvoltage capabilities of power electronic equipment are weaker in soft lineal system, and the low impedance characteristic of DC side makes short-circuit current
Climbing is larger, therefore soft lineal system is higher than AC system to the quick-action of protection and selectivity requirement, needs at several milliseconds
The entire exercises such as interior completion cutting and removing fault current, to prevent failure from damaging to direct current system and converter station.
There are mainly three types of the error protection modes of soft lineal system: using the Fault Isolation mode of AC circuit breaker；Utilize tool
The inverter topology of standby DC Line Fault ride-through capability or the Fault Isolation mode of control technology；Event based on high voltage DC breaker
Hinder isolation method.It is wherein long using the Fault Isolation time of AC circuit breaker, it is unable to satisfy soft straight system protection quick-action requirement.
And in view of existing flexible DC transmission engineering mostly uses the modular multilevel without DC Line Fault self-cleaning ability
(modular multilevel converter, MMC) structure, and can be made using inverter topology progress Fault Isolation is improved
At system shutdown, it is larger etc. to restart difficulty, the failure protection scheme based on dc circuit breaker be undoubtedly most potential direct current therefore
Hinder isolation scheme.Wherein hybrid high voltage DC breaker has the advantages that on-state loss is small, and switch off time is short, becomes direct current
The emphasis of net Preservation tactics research.
For not having the half-bridge MMC inverter of DC Line Fault self-cleaning ability, converter blocking can not block exchange system
System energy regenerative, and converter blocking can cause to impact to ac and dc systems, therefore break when DC line configures hybrid high voltage direct current
After the device of road, dc circuit breaker carries out that converter blocking should be avoided as far as possible during Fault Isolation.But since hybrid high voltage direct current is disconnected
The switch off time of road device is about 3ms, and fault current can continue the rise time during its separating brake, if inverter is in normal release
State, it is likely that bridge arm overcurrent can be caused to trigger converter unit protection, thus must passively adjust converter unit protection parameter or bridge arm
Reactance value just can guarantee that inverter is not latched.
On the other hand, when direct current system transmission line of electricity is overhead line situation, transient fault reaches in DC line fault
90% or more, it is considered as dc circuit breaker reclosing operation.To guarantee that it is free with extensive that the DC line after failure removal is sufficiently gone
Multiple insulation performance, reclosing delay of the breaker for the first time after separating brake should be greater than 100ms.During this period, inverter persistently unlocks meeting
It causes submodule capacitor persistently to charge and increase DC bus-bar voltage constantly, threatens system insulation.If locking is changed during this period
Stream device changes its control mode, it is made to maintain direct current system voltage stabilization, then AC system can be made to be affected again.
Furthermore it is noted that hybrid dc circuit breaker should be configured at every time to quickly isolate DC line fault
DC line both ends.For having the DC grid of a plurality of DC line, the configuration quantity of hybrid dc circuit breaker will very
It is huge.In view of the great number manufacturing expense of hybrid dc circuit breaker, this greatly reduces the economy of protection scheme.
To sum up, the DC line fault isolation scheme based on hybrid dc circuit breaker also needs to advanced optimize open circuit
The structure of device.For the problem that the parameter configuration of breaker, and it is worth research and explores.
To solve the above-mentioned problems, the present invention proposes a kind of current limliting capacitance-resistance branch, resistance-capacitance type dc circuit breaker and parameter choosing
Selection method.
Summary of the invention
To solve the above-mentioned problems, by the improvement to hybrid dc circuit breaker and its Preservation tactics, the present invention is proposed
A kind of current limliting capacitance-resistance branch, resistance-capacitance type dc circuit breaker (resistor and having electric current inhibition and voltage stabilization ability
Capacitor based DC circuit breaker, RC-DCCB) and parameter selection method.
Specifically disclosed are:
A kind of current limliting capacitance-resistance branch, the current limliting capacitance-resistance branch includes first input end and the second input terminal, defeated first
Enter and be in series with the first sub-circuit and the second sub-circuit between end and the second input terminal, the first sub-circuit includes first be serially connected
Resistance and first switch；Second sub-circuit includes the second switch being serially connected and 3rd resistor, in second switch and third electricity
The both ends of resistance are parallel with capacitor, are also parallel with second resistance.
As preferred embodiment of the invention, the first switch and the second switch is full control switch, and full control switch is by one
Or multiple IGBT are in series.
As preferred embodiment of the invention, lightning arrester connected in parallel is distinguished at the first switch and the second switch both ends.
At the same time, the invention further relates to a kind of resistance-capacitance type dc circuit breaker, the resistance-capacitance type DC circuit device packets
Containing first input end, the second input, output end；Current-carrying disjunction branch is connected between first input end and output end, it is described
Current-carrying disjunction branch is configured for realizing the isolation of fault point and faulty line；Connect between first input end and the second input terminal
It is connected to current limliting capacitance-resistance branch, the current limliting capacitance-resistance branch is configured for inhibiting direct fault current peak value, avoids inverter mistake
Stream locking.
As preferred embodiment of the invention, which is characterized in that the current limliting capacitance-resistance branch is foregoing current limliting capacitance-resistance
Branch.
As preferred embodiment of the invention, the current-carrying disjunction branch includes the current-carrying transfer switch that is serially connected and ultrafast
Speed switch.
As preferred embodiment of the invention, the current-carrying transfer switch is connected in series by one or more IGBT.
For the parameter selection method of current limliting capacitance-resistance branch above-mentioned, IGBT number needed for first switch are as follows:
Wherein, the master of first switch breaks current capacity as Im_T1, it is U that the both ends T1 maximum voltage value, which is voltage rating,dcN, single
A IGBT bearing capacity is UIGBT, through-current capability IIGBT；K be limited flow resistance hold branch direction coefficient；
IGBT number needed for second switch is maximum are as follows:
Idc_EAnd Udc_EFor the final stationary value of DC current and busbar voltage of design；The disconnected current capacity of the master of second switch
For Im_T2；
Wherein, the resistance value of first resistor are as follows:
Wherein, ULCS_E0For overvoltage initial value, Idc1For the DC current values for terminating moment to the first switch change of current,
The resistance value of second resistance are as follows:
The resistance value of 3rd resistor:
The resistance value of capacitor C are as follows:
Wherein, N is that number, C is connected in the equivalent discharge loop Neutron module of inverter0For the electricity in converter bridge arm submodule
The sum of hold, submodule is concatenated submodule on each bridge arm of inverter, each submodule both ends submodule capacitor in parallel.
For the parameter selection method for the resistance-capacitance type dc circuit breaker stated,
Wherein, Im_LCSFor the breaking current ability of current-carrying transfer switch, ULCS_EThe maximum electricity born for current-carrying transfer switch
Pressure；Single IGBT bearing capacity is UIGBT, through-current capability IIGBT；K ' is the direction coefficient that current-carrying is segmented branch；
The parameter of current limliting capacitance-resistance branch is selected according to foregoing parameter selection method.
The beneficial effects of the present invention are: the present invention proposes a kind of new high-voltage direct-current breaker topology, i.e. resistance-capacitance type hinders
Holding branch, resistance-capacitance type direct-current breaker topology, current limliting capacitance-resistance branch routing capacitance, resistance etc. are constituted and are parallel on DC bus,
Branch is blocked by control current limliting, makes charging to capacitor C for direct fault current, can greatly inhibit direct fault current peak
Value avoids inverter overcurrent from being latched；Pass through resistance R1、R2Consume inverter output energy, can with stable DC busbar voltage,
Be conducive to the stabilization of ac and dc systems.Since inverter is not required to locking during Fault Isolation and ac and dc systems are able to maintain stabilization,
Therefore it is more advantageous to the fast quick-recovery of circuit re-switching and power transmission, improves the stability and reliability of ac and dc systems.
Detailed description of the invention
Fig. 1 is the circuit diagram of current limliting capacitance-resistance branch；
Fig. 2 is the circuit diagram of resistance-capacitance type dc circuit breaker；
Curent change process when Fig. 3 is the conducting of current limliting capacitance-resistance branch；
Three equivalent discharge loop of converter valve when Fig. 4 is the conducting of current limliting capacitance-resistance branch；
Three equivalent discharge loop of the domain s converter valve when Fig. 5 is the conducting of current limliting capacitance-resistance branch；
Fig. 6 is the equivalent discharge loop of capacitor C after current limliting capacitance-resistance branch disconnects；
Fig. 7 is a both ends MMC symmetrical monopolar test system model figure；
Stabilization process figure of the resistance-capacitance type dc circuit breaker to DC current and voltage when Fig. 8 is consideration single lock.
Specific embodiment
For a clearer understanding of the technical characteristics, objects and effects of the present invention, this hair of Detailed description of the invention is now compareed
Bright specific embodiment.
The present invention proposes a kind of current limliting capacitance-resistance branch, resistance-capacitance type direct current interruption for having electric current inhibition and voltage stabilization ability
Device (resistor and capacitor based DC circuit breaker, RC-DCCB) and parameter selection method.
A kind of current limliting capacitance-resistance branch as shown in Figure 1, the current limliting capacitance-resistance branch include first input end and the second input
End, is in series with the first sub-circuit and the second sub-circuit between first input end and the second input terminal, and the first sub-circuit includes phase
Mutual concatenated first resistor R1 and first switch T1；Second sub-circuit includes the second switch T2 being serially connected and 3rd resistor
R3 is parallel with capacitor C at the both ends of second switch T2 and 3rd resistor R3, is also parallel with second resistance R2R2.
As preferred embodiment of the invention, the first switch T1 and second switch T2 are full control switch, full control switch by
One or more IGBT are in series.
As preferred embodiment of the invention, lightning arrester connected in parallel is distinguished in the first switch T1 and the both ends second switch T2.
At the same time, as shown in Fig. 2, the invention further relates to a kind of resistance-capacitance type dc circuit breaker, the resistance-capacitance type is straight
Current circuit device includes first input end, the second input, output end；Current-carrying disjunction is connected between first input end and output end
Branch, the current-carrying disjunction branch are configured for realizing the isolation of fault point and faulty line；First input end and second defeated
Enter and connect current limiting capacitance-resistance branch between end, the current limliting capacitance-resistance branch is configured for inhibiting direct fault current peak value, keeps away
Exempt from the locking of inverter overcurrent.
As preferred embodiment of the invention, which is characterized in that the current limliting capacitance-resistance branch is foregoing current limliting capacitance-resistance
Branch.
As preferred embodiment of the invention, the current-carrying disjunction branch include the current-carrying transfer switch LCS that is serially connected and
Ultra fast breaker.
As preferred embodiment of the invention, the current-carrying transfer switch LCS is connected in series by one or more IGBT.
The current-carrying disjunction branch of the resistance-capacitance type dc circuit breaker is configured at DC line both ends, is the through-flow branch of stable state,
Has two-way connecting-disconnecting function；Current limliting capacitance-resistance branch one end connects direct current pole bus B1, other end B2Tie point then with DC converter
Valve topology and valve top-cross stream earthing mode are related.For true bipolar DC system, the two poles of the earth can independent operating, therefore B2Connect earthing pole
Neutral bus.The two-wire line in converter station exit respectively configures a dc circuit breaker, and DC Line Fault can trigger the disconnected of failure pole
The movement of road device.For pseudo- bipolar DC system (symmetrical monopolar system), B2Tie point there are two types of situation:
(1) Converter Station Valve side AC earth: under this kind of situation, fault point and AC earth point will form event after monopole failure
Hinder current path, therefore as very bipolar situation, the two poles of the earth respectively configure a breaker, and capacitance-resistance grounding.
(2) Converter Station Valve top-cross stream is earth-free: under this kind of situation, because monopole failure can not form current path,
Monopole failure does not have fault current, and direct current system zero-potential point can only deviated, and normal pole tension increases, and direct current system can be kept
Short-time duty.Only direct current system will appear short circuit current, therefore B after bipolar failure at this time2Another pole DC bus should be connected, is hindered
Hold branch circuit parallel connection between the two poles of the earth, breaker is only in response to bipolar failure.And the through-flow branch of stable state is configured in a pole or the two poles of the earth, surely
The component parameters of state is through-flow branch are accordingly different.
For the parameter selection method of current limliting capacitance-resistance branch above-mentioned, IGBT number needed for first switch T1 are as follows:
Wherein, the master of first switch T1 breaks current capacity as Im_T1, it is U that the both ends T1 maximum voltage value, which is voltage rating,dcN,
Single IGBT bearing capacity is UIGBT, through-current capability IIGBT；K be limited flow resistance hold branch direction coefficient；
IGBT number needed for second switch T2 is maximum are as follows:
Idc_EAnd Udc_EFor the final stationary value of DC current and busbar voltage of design；The main power-off stream energy of second switch T2
Power is Im_T2；
Wherein, the resistance value of first resistor R1 are as follows:
Wherein, ULCS_E0For overvoltage initial value, Idc1For the DC current values for terminating moment to the first switch T1 change of current,
The resistance value of second resistance R1 are as follows:
The resistance value of 3rd resistor R3:
The resistance value of capacitor C are as follows:
Wherein, N is that number, C is connected in the equivalent discharge loop Neutron module of inverter0For the electricity in converter bridge arm submodule
The sum of hold, submodule is concatenated submodule on each bridge arm of inverter, each submodule both ends submodule capacitor in parallel.
For the parameter selection method for the resistance-capacitance type dc circuit breaker stated,
Wherein, Im_LCSFor the breaking current ability of current-carrying transfer switch LCS, ULCS_EIt is born for current-carrying transfer switch LCS
Maximum voltage；Single IGBT bearing capacity is UIGBT, through-current capability IIGBT；K ' is the direction coefficient that current-carrying is segmented branch；
The parameter of current limliting capacitance-resistance branch is selected according to foregoing parameter selection method.
The workflow of current limliting capacitance-resistance branch of the present invention are as follows:
When circuit malfunctions, the major function of electric current transfer switch LCS is to be transferred to the electric current for injecting fault point
Current limliting capacitance-resistance branch.Supper-fast mechanical switch UFDUFD has zero current quick-speed turning on-off ability, realizes the isolation of fault point.
Current limliting capacitance-resistance branch is the core of resistance-capacitance type dc circuit breaker.Main switch T1Control current limliting capacitance-resistance branch is opened
It is disconnected.Switch T2Capacitor C electric discharge is controlled, with switch T1Interlocking action, folding condition are opposite.Capacitor C, resistance R1, resistance R2It constitutes
Capacitance-resistance structure, rise limitation current peak, maintain DC voltage, electric current effect.Resistance R3For discharge loop resistance, electricity is influenced
Hold the discharge time constant of C.
First stage after failure disconnects moment t for LCS2To Reclosing Instant t6, stage T1Conducting, T2It disconnects, current limliting
Capacitance-resistance branch is constantly in investment state, resistance R1、R2On flow through transfer current, capacitor C both end voltage constantly increases, electric current
Change procedure is as shown in Figure 3.
Initial time: as shown in Fig. 3 (a), capacitor C both end voltage is zero before being shifted due to electric current, transfer moment electricity
Hinder R2It is short-circuited, electric current first flows through resistance R1And capacitor C, d-c bus voltage value is mainly by resistance R1The pressure drop at both ends provides.
By adjusting resistance R1The DC bus-bar voltage of adjustable whole capacitance-resistance branch conducting moment restores initial value ULCS_E0；
The capacitor charging stage: as shown in Fig. 3 (b), after electric current shifts completely, capacitance voltage is gradually risen, resistance R2Above go out
Existing electric current is simultaneously gradually increased.
Stabilization sub stage: as shown in Fig. 3 (c), if switch T1Constant conduction, then the charging current of capacitor C can be decreased to zero,
Both end voltage is stablized, and R is flowed through1、R2Electric current it is also stable therewith, DC bus-bar voltage remains unchanged.By selecting R1, R2's
Value can make stable state time limit flow resistance hold branch both end voltage Udc_E, resistance R1On electric current be DC rated current Idc_E。
In the above-mentioned first stage, with the bipolar failure of symmetrical monopolar situation (the monopole failure of bipolar DC system situation is similar)
For, three equivalent discharge loop of converter valve is as shown in Figure 4.Wherein C1Represent equivalent capacity；L1Represent equivalent inductance；RdIt represents
Loop resistance, including ground connection electrode resistance etc..Assuming that in t2Moment, equivalent capacity C1Voltage is Ud1, DC current Id1, capacitor C
Both end voltage is 0, then the corresponding domain s equivalent circuit is as shown in Figure 5.Therefore the steady state voltage u of capacitor CC_maxAnd flow through resistance R1
And R2Electric current be
uC_max=Udc_E-Idc_E·R1
Wherein
The electric current i under time domain can be obtained by pull-type inverse transformationR1And iR2。
Second stage, from UFD closing moment t6Moment t is disconnected to current limliting capacitance-resistance branch9: the capacitance-resistance branch current in the stage
It is related with fault type to measure situation.For transient fault, after UFD closes a floodgate, since busbar voltage is rated value, capacitance-resistance branch electricity
Stream keeps rated current to be basically unchanged, and DC line electric current slowly rises.
For permanent fault, after being closed a floodgate due to UFD, submodule capacitor forms discharge path, direct current to fault point again
Line current rises rapidly.Since busbar voltage is greatly reduced, capacitance-resistance branch voltage difference of the two ends substantially reduces, capacitance-resistance branch current
It is forced to be reduced rapidly to zero.But due to the presence of capacitor C, resistance R2Both end voltage can not be mutated, in t6To t7Very short time
It is interior, R2Both end voltage is basically unchanged, and electric current is maintained steady-state current I thereondc_E.Hereafter in t7When moment to capacitance-resistance branch disconnects
Carve t9Between, capacitance-resistance branch road again flows through electric current, and current loop is consistent with Fig. 4.
Phase III, t after being disconnected for capacitance-resistance branch9(current limliting capacitance-resistance branch in other words at the time of moment completes to discharge to capacitor C
At the time of road reverts to original state, this sentences infinite moment of time " ∞ " expression).In this stage, arrester and R1It is upper too small
Width residual current, capacitor C is to resistance R2And R3Electric discharge, as shown in fig. 6, resistance R2And R3On the discharge current that flows through be
Invention is applied to both ends MMC symmetrical monopolar test macro, illustrates specific embodiments of the present invention.One build in
Both ends MMC symmetrical monopolar test macro in PSCAD/EMTDC is as shown in fig. 7, configure resistance-capacitance type direct current of the invention in system
Breaker (RC-DCCB).Through clamped resistance eutral grounding, valve top-cross stream is earth-free for the system dc side, therefore current limliting capacitance-resistance branch is simultaneously
It is associated between the two poles of the earth.The system nominal power 150MW, voltage rating ± 150kV, wherein MMC1 is rectifier, using surely active
Control, MMC2 is inverter, using constant DC voltage control.The specific part parameter such as following table of inverter member.
In the embodiment, U is takenLCS_E0And Udc_EFor 150kV, Idc_EFor 0.5kA.Failure generation terminates to need 1ms to the change of current, should
The fault current climbing about 2.5kA/ms for using mini system is tested, then Id1About 3kA.The selection of resistance-capacitance type dc circuit breaker component parameters
Are as follows:
Branch current when resistance-capacitance type dc circuit breaker single separating brake is as shown in Figure 8.After failure when the rising of DC current
Between can maintain in 1.5ms, wherein only about 1ms, line current peak value are limited to about 3kA to fault current fast rise time, only
6p.u.Since current peak is smaller, line current can quickly be reduced to zero in 5ms.Fig. 8 illustrates that resistance-capacitance type dc circuit breaker has
Stronger fault current rejection ability.
It should be noted that for simple description, therefore, it is stated as a systems for each embodiment of the method above-mentioned
The combination of actions of column, but those skilled in the art should understand that, the application is not limited by the described action sequence, because
For according to the application, certain some step be can be performed in other orders or simultaneously.Secondly, those skilled in the art also should
Know, the embodiments described in the specification are all preferred embodiments, related movement and unit not necessarily this Shen
It please be necessary.
In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, is not described in some embodiment
Part, reference can be made to the related descriptions of other embodiments.
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 program can be stored in computer-readable storage medium
In, the program is when being executed, it may include such as the process of the embodiment of above-mentioned each method.Wherein, the storage medium can be magnetic
Dish, CD, ROM, RAM etc..
The above disclosure is only the preferred embodiments of the present invention, cannot limit the right model of the present invention with this certainly
It encloses, therefore equivalent changes made in accordance with the claims of the present invention, is still within the scope of the present invention.
Claims (7)
1. a kind of current limliting capacitance-resistance branch, which is characterized in that the current limliting capacitance-resistance branch includes first input end and the second input terminal,
The first sub-circuit and the second sub-circuit are in series between first input end and the second input terminal, the first sub-circuit includes mutually to go here and there
The first resistor and first switch of connection；Second sub-circuit includes the second switch being serially connected and 3rd resistor, in second switch
With the both ends of 3rd resistor, it is parallel with capacitor, is also parallel with second resistance；
IGBT number needed for first switch are as follows:
Wherein, the master of first switch breaks current capacity as Im_T1, first switch maximum voltage value is that voltage rating is UdcN, individually
IGBT bearing capacity is UIGBT, through-current capability IIGBT；K be limited flow resistance hold branch direction coefficient；
IGBT number needed for second switch is maximum are as follows:
Idc_EAnd Udc_EFor the final stationary value of DC current and busbar voltage of design；The master of the second switch current capacity that breaks is
Im_T2；
Wherein, the resistance value of first resistor are as follows:
Wherein, ULCS_E0For overvoltage initial value, Idc1For the DC current values for terminating moment to the first switch change of current,
The resistance value of second resistance are as follows:
The resistance value of 3rd resistor:
The resistance value of capacitor C are as follows:
Wherein, N is that number, C is connected in the equivalent discharge loop Neutron module of inverter0For the capacitor in converter bridge arm submodule it
With submodule is concatenated submodule on each bridge arm of inverter, each submodule both ends submodule capacitor in parallel.
2. a kind of current limliting capacitance-resistance branch as described in claim 1, in parallel respectively at the first switch and the second switch both ends
Arrester.
3. a kind of resistance-capacitance type dc circuit breaker using current limliting capacitance-resistance branch described in one of claim 1-2, which is characterized in that
The resistance-capacitance type dc circuit breaker includes first input end, the second input, output end；Connect between first input end and output end
It is connected to current-carrying disjunction branch, the current-carrying disjunction branch is configured for realizing the isolation of fault point and faulty line；First is defeated
Enter and be connected with the current limliting capacitance-resistance branch between end and the second input terminal, the current limliting capacitance-resistance branch is configured for inhibiting direct current
Fault current peak value, avoids inverter overcurrent from being latched, and stable DC busbar voltage is conducive to the stabilization of ac and dc systems.
4. a kind of resistance-capacitance type dc circuit breaker as claimed in claim 3, which is characterized in that the current-carrying disjunction branch includes phase
Mutual concatenated current-carrying transfer switch and ultra fast breaker.
5. a kind of resistance-capacitance type dc circuit breaker as claimed in claim 4, which is characterized in that the current-carrying transfer switch is by one
A or multiple IGBT are formed in series and parallel.
6. a kind of parameter selection method of the current limliting capacitance-resistance branch as described in one of claim 1-2, which is characterized in that
IGBT number needed for first switch are as follows:
Wherein, the master of first switch breaks current capacity as Im_T1, first switch maximum voltage value is that voltage rating is UdcN, individually
IGBT bearing capacity is UIGBT, through-current capability IIGBT；K be limited flow resistance hold branch direction coefficient；
IGBT number needed for second switch is maximum are as follows:
Idc_EAnd Udc_EFor the final stationary value of DC current and busbar voltage of design；The master of the second switch current capacity that breaks is
Im_T2；
Wherein, the resistance value of first resistor are as follows:
Wherein, ULCS_E0For overvoltage initial value, Idc1For the DC current values for terminating moment to the first switch change of current,
The resistance value of second resistance are as follows:
The resistance value of 3rd resistor:
The resistance value of capacitor C are as follows:
Wherein, N is that number, C is connected in the equivalent discharge loop Neutron module of inverter0For the capacitor in converter bridge arm submodule it
With submodule is concatenated submodule on each bridge arm of inverter, each submodule both ends submodule capacitor in parallel.
7. a kind of parameter selection method of the resistance-capacitance type dc circuit breaker as described in one of claim 3-5, which is characterized in that
Wherein, Im_LCSFor the breaking current ability of current-carrying transfer switch, ULCS_EThe maximum voltage born for current-carrying transfer switch；It is single
A IGBT bearing capacity is UIGBT, through-current capability IIGBT；K ' is the direction coefficient that current-carrying is segmented branch；
Parameter selection method is selected the parameter of current limliting capacitance-resistance branch according to claim 6.
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