CN108808634A - HVDC transmission line longitudinal protection method based on smoothing reactor voltage - Google Patents
HVDC transmission line longitudinal protection method based on smoothing reactor voltage Download PDFInfo
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- CN108808634A CN108808634A CN201810316509.5A CN201810316509A CN108808634A CN 108808634 A CN108808634 A CN 108808634A CN 201810316509 A CN201810316509 A CN 201810316509A CN 108808634 A CN108808634 A CN 108808634A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- Inverter Devices (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The present invention relates to a kind of HVDC transmission line longitudinal protection methods based on smoothing reactor voltage; the differentiation of the main mutation direction realization area internal and external fault using HVDC transmission line rectification side smoothing reactor voltage and inverter side smoothing reactor voltage, its step are as follows：By voltage collecting device collect DC line rectification side, inverter side smoothing reactor both ends voltage.Rectification side, inverter side smoothing reactor voltage u are judged respectivelyM、uNMutation direction pM、pN.Utilize the mutation direction p of smoothing reactor voltageM、pNIt realizes the identification of area's internal and external fault, and failure is carried out to troubles inside the sample space and selects pole.
Description
Technical field
The present invention relates to electric system ultra-high/extra-high voltage direct current transportation relay protection fields, more particularly to one kind being based on flat wave
The HVDC transmission line longitudinal protection method of reactor voltage characteristic.
Background technology
As high voltage direct current (high voltage direct current, HVDC) transmission of electricity is in long distance powedr transmission, asynchronous
The application of Power System Interconnection etc. increases, and protection of direct current supply line is increasingly aobvious to ensureing the safety and reliability of electric system
It must be even more important.HVDC transmission line often passes through complicated landform, runs under extreme climatic environment, and failure occurs general
Rate is higher, seriously threatens the safe and reliable operation of DC transmission system.Therefore, HVDC transmission line protection is existing for ensureing
It is most important for the reliability and safety of transmission system.
Currently, HVDC transmission line is mostly using traveling-wave protection and differential under-voltage protection as main protection, current differential is protected
Shield is used as back-up protection.But there are sensitive when sample frequency height, high transition Resistance Fault for traveling-wave protection and differential under-voltage protection
The problems such as property is low.Back-up protection of the current differential protection as detection high resistive fault, to hide the influence of capacitance current, action is prolonged
When up to more than hundreds of milliseconds.It will lead to the pole if converter valve valve unit protection is acted prior to current differential protection in this delay stage
It stops transport.Therefore, current differential protection can not play the role of back-up protection sometimes, and occur the above situation in Practical Project.
For current DC line protection there are the problem of, research that numerous scholars protect HVDC transmission line
Based on main protection.《Fault analysis and traveling-wave protection scheme for bipolar
HVDC lines》New high speed traveling-wave protection is proposed, but is easily disturbed and high resistant influence.《Utilize filter branches electric current
HVDC transmission line complete fibre is protected》By judge under special frequency band single-ended current amplitude whether be more than setting threshold come
Differentiate the inside and outside event in area, but when the far-end fault of longer lines, the sensitivity of protection may cannot be satisfied requirement.《High-voltage dc transmission
Electric line current differential protection new principle》Differential protecting method is proposed based on Bei Ruilong distributed parameter models, but needs both ends
Data stringent synchronization.《A transient protection scheme for HVDC transmission line》With
《Novel pilot protection principle for high-voltage direct current
transmission lines based on fault component current characteristics》Basis respectively
Rectification side, inverter side both ends transient state energy, fault current difference when area's internal and external fault, it is proposed that new pilot protection scheme, energy
It enough realizes the accurate differentiation of area's internal and external fault, but two end datas is needed to synchronize, and sensitivity and reliable when high transition Resistance Fault
Property it is insufficient.Therefore, to ensure reliability and the safety of DC power transmission line, new HVDC transmission line protection side is studied
Method has a very important significance.
Invention content
In view of the above-mentioned problems, the present invention proposes that a kind of HVDC transmission line based on smoothing reactor voltage characteristic is vertical
UNPROFOR maintaining method.This method is based on smoothing reactor voltage transient feature when DC transmission system area internal and external fault, constructs high pressure
It is straight not only to overcome conventional high-tension to identify DC power transmission line area internal and external fault for DC power transmission line pilot protection new criterion
The deficiency of transmission line of electricity main protection is flowed, and does not need the synchronization of two end datas, sample frequency is relatively low, and operation is simple, it is easy to accomplish.
Technical scheme is as follows：
A kind of HVDC transmission line longitudinal protection method based on smoothing reactor voltage mainly utilizes high voltage direct current
The mutation direction realization area internal and external fault of transmission line of electricity rectification side smoothing reactor voltage and inverter side smoothing reactor voltage
Differentiate, its step are as follows：
(1) by voltage collecting device collect DC line rectification side, inverter side smoothing reactor both ends voltage,
And calculate positive circuit rectification side smoothing reactor voltage uMp, anode circuit rectification side smoothing reactor voltage uMn, positive circuit
Inverter side smoothing reactor voltage uNp, anode circuit inverter side smoothing reactor voltage uNnWith rectification side smoothing reactor voltage
uM, inverter side smoothing reactor voltage uN。
(2) rectification side, inverter side smoothing reactor voltage u are judged respectivelyM、uNMutation direction pM、pN。
(3) the mutation direction p of smoothing reactor voltage is utilizedM、pNRealize area's internal and external fault identification, and to troubles inside the sample space into
Row failure selects pole, method as follows：If the mutation direction of rectification side and inverter side smoothing reactor voltage is positive direction, i.e. pM=
1 and pN=1, then failure is DC line troubles inside the sample space；If the mutation direction of rectification side smoothing reactor voltage is negative direction, and
The mutation direction of inverter side smoothing reactor voltage is positive direction, i.e. pM=-1 and pN=1, judgement failure is event outside rectification lateral areas
Barrier；If the mutation direction of rectification side smoothing reactor voltage is positive direction, and the mutation direction of inverter side smoothing reactor voltage
For negative direction, i.e. pM=1 and pN=-1, judgement failure is inverter side external area error.
In step (2), judgement rectification side, inverter side smoothing reactor voltage mutation direction pM、pN, as follows using formula
In formula, pi=1 indicates that the mutation direction of the sides i smoothing reactor voltage is positive direction, pi=-1 indicates the flat wave electricity in the sides i
The mutation direction of reactor voltage is negative direction；I takes M, N, indicates rectification side, inverter side respectively；NTFor adopting in the long 5ms of data window
Number of samples；K is integer, takes 1,2,3 ... ..., NT；uM(k) it is rectification side smoothing reactor voltage uMTime-domain sampling value, uN(k)
For inverter side smoothing reactor voltage uNTime-domain sampling value； usetFor setting valve, consider that direct current transducer measurement error is chosen
0.02UN, UNFor straight-flow system rated voltage.
In step (1), for positive transmission line of electricity, rectification side smoothing reactor voltage positive direction is to be directed toward just from converting plant
Polar curve road, inverter side smoothing reactor voltage positive direction are to be directed toward positive circuit from Inverter Station；For cathode transmission line of electricity, rectification
Side smoothing reactor voltage positive direction is to be directed toward converting plant from anode circuit, and inverter side smoothing reactor voltage positive direction is from negative
It is directed toward Inverter Station in polar curve road.
Rectification side smoothing reactor voltage uMFor positive circuit rectification side smoothing reactor voltage uMpWith anode circuit rectification
Side smoothing reactor voltage uMnThe sum of；Inverter side smoothing reactor voltage uNFor positive circuit inverter side smoothing reactor voltage
uNpWith anode circuit inverter side smoothing reactor voltage uNnThe sum of.
The present invention is for defect existing for conventional high-tension protection of direct current supply line, it is proposed that one kind being based on smoothing reactor
The HVDC transmission line longitudinal protection method of voltage characteristic.It has the following advantages compared with prior art：
(1) this method realizes the differentiation of area's internal and external fault using the mutation direction character of smoothing reactor voltage, does not need
Two end datas synchronize.
(2) the mutation direction difference of smoothing reactor voltage when the present invention is based on DC transmission system area internal and external fault,
HVDC transmission line longitudinal protection method is proposed, protection is theoretical perfect, selective good.
(3) compared with the conventional method, the method for the present invention is not influenced by circuit distributed constant, and resistance to high resistant.
(4) fault identification is carried out using the mutation direction of smoothing reactor voltage, due to believing using smoothing reactor voltage
Number, it is low to the sample frequency requirement of protective device, therefore the method for the present invention is with low to hardware requirement, it is easy to accomplish the characteristics of.
Description of the drawings
Fig. 1 bipolar HVDC system schematic diagrames.
Fig. 2 HVDC transmission system equivalent circuits.
System failure adjunct circuit when Fig. 3 troubles inside the sample spaces.
System failure adjunct circuit when Fig. 4 external area errors.
Figure label explanation：
F in Fig. 13、f4Monopole, bipolar failure respectively in DC power transmission line area；f1And f2、f5And f6Respectively rectification
Side, inverter side external area error；uMp、uMnAnd uNp、uNnIt is anode, the ends anode circuit M and N-terminal shunt reactor voltage respectively；For
Positive circuit, up1And up2、 u p3And up4Respectively rectification side, inverter side smoothing reactor both sides measurement point voltage；For negative
Pole, un1And un2、un3And un4Respectively rectification side, inverter side smoothing reactor both sides measurement point voltage.
(a) figure is HVDC transmission system anode equivalent circuit in Fig. 2；(b) figure is HVDC transmission system cathode
Equivalent circuit；uR、uIIt is the Equivalent DC voltage source of rectification side, inverter side transverter and AC system respectively；uMp、uMnAnd uNp、
uNnIt is anode, the ends anode circuit M and N-terminal shunt reactor voltage respectively；LM、LNBe respectively rectification side, inverter side transverter and
The equiva lent impedance of AC system；LsrIt is smoothing reactor inductance；R1And R2、L1And L2, C be respectively DC line equal set in
Parameter resistance, inductance, capacitance.
The system failure adds equivalent circuit when (a) figure is interpolar failure in Fig. 3；(b) system failure when figure is positive electrode fault
Additional equivalent circuit；ΔiM、ΔiNIt is rectification side, inverter side smoothing reactor transient current Sudden Changing Rate respectively；ufIt is folded for fault point
The voltage source added；RfFor fault point transition resistance.
The system failure adds equivalent circuit when (a) figure is rectification side external area error in Fig. 4；(b) figure is event outside inversion lateral areas
The system failure adds equivalent circuit when barrier；iCIt is DC power transmission line equivalent capacity discharge current.
Specific implementation mode
The present invention is described in detail with reference to the accompanying drawings and examples.
A kind of HVDC transmission line longitudinal protection method based on smoothing reactor voltage characteristic mainly utilizes high pressure
The inside and outside event in the mutation direction realization area of DC power transmission line rectification side smoothing reactor voltage and inverter side smoothing reactor voltage
The differentiation of barrier, is as follows：
(1) as shown in Figure 1, being the HVDC transmission system schematic diagram of the present embodiment concrete application.Pass through voltage acquisition
Device collect DC line rectification side, inverter side smoothing reactor both ends voltage, and through data processing equipment calculate just
Polar curve road rectification side smoothing reactor voltage uMp, anode circuit rectification side smoothing reactor voltage uMn, positive circuit inverter side it is flat
Wave reactor voltage uNp, anode circuit inverter side smoothing reactor voltage uNnWith rectification side smoothing reactor voltage uM, inverter side
Smoothing reactor voltage uN。
(2) rectification side, inverter side smoothing reactor voltage u are judged respectivelyM、uNMutation direction pM、pN。
(3) the mutation direction p of smoothing reactor voltage is utilizedM、pNRealize area's internal and external fault identification, and to troubles inside the sample space into
Row failure selects pole.
In step (1), for positive transmission line of electricity, rectification side smoothing reactor voltage positive direction is to be directed toward just from converting plant
Polar curve road, inverter side smoothing reactor voltage positive direction are to be directed toward positive circuit from Inverter Station；For cathode transmission line of electricity, rectification
Side smoothing reactor voltage positive direction is to be directed toward converting plant from anode circuit, and inverter side smoothing reactor voltage positive direction is from negative
It is directed toward Inverter Station in polar curve road.
In step (1), rectification side smoothing reactor voltage uMFor positive circuit rectification side smoothing reactor voltage uMpWith it is negative
Polar curve road rectification side smoothing reactor voltage uMnThe sum of；Inverter side smoothing reactor voltage uNFor the flat wave electricity of positive circuit inverter side
Reactor voltage uNpWith anode circuit inverter side smoothing reactor voltage uNnThe sum of.
In step (2), judgement rectification side, inverter side smoothing reactor voltage mutation direction pM、pN, as follows using formula
In formula, pi=1 indicates that the mutation direction of the sides i smoothing reactor voltage is positive direction, pi=-1 indicates the flat wave electricity in the sides i
The mutation direction of reactor voltage is negative direction；I takes M, N, indicates rectification side, inverter side respectively；NTFor adopting in the long 5ms of data window
Number of samples；K is integer, takes 1,2,3 ... ..., NT；uM(k) it is rectification side smoothing reactor voltage uMTime-domain sampling value, uN(k) it is
Inverter side smoothing reactor voltage uNTime-domain sampling value； usetFor setting valve, consider that direct current transducer measurement error is chosen
0.02UN, UNFor straight-flow system rated voltage.
In step (3), if the mutation direction of rectification side and inverter side smoothing reactor voltage is positive direction, i.e. pM=1
And pN=1, then failure is DC line troubles inside the sample space；If the mutation direction of rectification side smoothing reactor voltage is negative direction, and
The mutation direction of inverter side smoothing reactor voltage is positive direction, i.e. pM=-1 and pN=1, judgement failure is event outside rectification lateral areas
Barrier；If the mutation direction of rectification side smoothing reactor voltage is positive direction, and the mutation direction of inverter side smoothing reactor voltage
For negative direction, i.e. pM=1 and pN=-1, judgement failure is inverter side external area error.
In step (3), the mutation direction p based on smoothing reactor voltageM、pNRealize that the identification of area's internal and external fault, principle are：
HVDC transmission system equivalent circuit, as shown in Figure 2.In area when interpolar failure, HVDC transmission system
Failure adds equivalent circuit, as shown in Figure 3.
By Fig. 3, can be obtained according to Kirchhoff's second law (KVL)
When interpolar failure occurs for HVDC transmission system, smoothing reactor transient current Sudden Changing Rate Δ iMWith Δ iNRapidly
Increase, abbreviation formula (1) can obtain
Therefore, positive, anode circuit rectification side and inverter side smoothing reactor transient state mutation voltage Δ uMp、ΔuMnWith
ΔuNp、ΔuNn
By formula (3) it is found that in area when interpolar failure, smoothing reactor transient state mutation on anode and negative DC transmission line of electricity
Voltage Δ uMp、ΔuNpWith Δ uMp、ΔuNpAll it is forward mutation assay.
In area when monopole (anode) earth fault, it is as shown in Figure 4 that failure adds equivalent circuit.
Failure adds equivalent circuit according to Fig.4, can similarly obtain
Therefore, the mutation voltage Δ u of rectification side and inverter side smoothing reactorMp、ΔuNp
According to formula (3) and (5) it is found that when troubles inside the sample space occurs, faulty line inverter side, rectification side smoothing reactor
Mutation voltage is all forward mutation assay.
When rectification side, Inverter Station external area error, failure is added equivalent respectively as shown in Fig. 4 (a), Fig. 4 (b).Outside for area
Failure, smoothing reactor transient current Sudden Changing Rate Δ iM、ΔiNWith capacitance current iCThere are following relationships
By formula (6) it is found that DC power transmission line equivalent capacity discharge current iCTransient current Sudden Changing Rate Δ i will not be changedM、
ΔiNMutation direction.
It can be obtained according to Kirchhoff's second law (KVL) by Fig. 5
During fault transient, rectification side smoothing reactor transient current reduces, Δ iMMutation direction is negative sense；Inverter side
Smoothing reactor transient current increases, Δ iNIt is forward direction to be mutated direction.Therefore, when rectification side external area error, rectification side and inversion
The mutation voltage Δ u of side smoothing reactorMp、ΔuNp
It can similarly obtain, when inverter side external area error, the mutation voltage Δ u of rectification side and inverter side smoothing reactorMp、Δ
uNp
ΔuMp> 0and Δs uNp< 0 (9)
According to formula (6), formula (8) and formula (9) it is found that for external area error, rectification side, inverter side smoothing reactor voltage
Mutation direction is not influenced by DC power transmission line capacitance current；When rectification side external area error occurs, the flat wave reactance of rectification side
The mutation voltage of device is mutated for negative sense, and the mutation voltage of inverter side smoothing reactor is forward mutation assay；When outside generation inversion lateral areas
When failure, the mutation voltage of rectification side smoothing reactor is forward mutation assay, and the mutation voltage of inverter side smoothing reactor is negative sense
Mutation.
Therefore, for HVDC transmission line troubles inside the sample space, either (anode is negative for interpolar failure failure or monopole
Pole) earth fault, rectification side and inverter side smoothing reactor transient voltage are forward mutation assay；For external area error, failure side
Smoothing reactor transient voltage is mutated for negative sense, and non-faulting side smoothing reactor transient voltage is forward mutation assay.Thus can basis
Rectification side and inverter side smoothing reactor transient voltage are dashed forward nyctitropic difference construction high-voltage dc transmission electric wire when area's internal and external fault
Road pilot protection criterion.
Due to rectification side, to this side, smoothing reactor voltage jump direction is identified respectively first for inverter side protection, so
Fault type is determined according to smoothing reactor voltage jump direction afterwards.Therefore, guard method of the present invention does not need two end datas
It is synchronous, and data transmission channel is protected only to need to transmit smoothing reactor voltage jump direction determining result.
± 800kV Burner zone super high voltage direct current electricity transmission systems are built using PSCAD/EMTDC softwares in the present embodiment, are such as schemed
Shown in 1.DC power transmission line overall length is 1 907km, using frequency dependent model；Sample frequency is 10kHz.
1) troubles inside the sample space
Influence for validation fault distance, transition resistance etc. to protection scheme, simulation result are as shown in table 1.It can by table 1
Know, it is positive direction that rectification side and inverter side smoothing reactor voltage, which increase and is mutated direction, after failure, and protection is determined as in area
Failure, protection are not influenced with high sensitivity, reliability by fault distance；When high transition resistance, protection can realize failure
Type accurately identifies.
The troubles inside the sample space simulation result of 1 different faults distance of table
2) external area error
Further to verify the applicability and reliability of protection, the external area error simulation result such as table 2 of different faults type
It is shown.As shown in Table 2, for various types of external area errors, guard method of the present invention still has higher reliability.
Simulation result when 2 different type external area error of table
3) influence of sample frequency
Circuit end fault f under different sample frequencys3With f outside area5The results are shown in Table 3 for fault simulation.As shown in Table 3, when
When sample frequency reduces, flat wave device voltage value can slightly become smaller, but simulation result shows that protection can accurately judge failure classes
Type.Therefore, the requirement of guard method of the present invention can be met not less than the sample frequency of 2000Hz.
Simulation result when 3 difference sample frequency of table
Although above-mentioned be in conjunction with specific embodiments described the specific implementation mode of the present invention, not to this hair
The limitation of bright protection domain, those skilled in the art should understand that, based on the technical solutions of the present invention, this field skill
Art personnel need not make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (5)
1. a kind of HVDC transmission line longitudinal protection method based on smoothing reactor voltage mainly utilizes high-voltage dc transmission
The mutation direction realization area internal and external fault of electric line rectification side smoothing reactor voltage and inverter side smoothing reactor voltage is sentenced
Not, its step are as follows：
(1) by voltage collecting device collect DC line rectification side, inverter side smoothing reactor both ends voltage, and count
Calculate positive circuit rectification side smoothing reactor voltage uMp, anode circuit rectification side smoothing reactor voltage uMn, positive circuit inversion
Side smoothing reactor voltage uNp, anode circuit inverter side smoothing reactor voltage uNnWith rectification side smoothing reactor voltage uM, it is inverse
Become side smoothing reactor voltage uN；
(2) rectification side, inverter side smoothing reactor voltage u are judged respectivelyM、uNMutation direction pM、pN；
(3) the mutation direction p of smoothing reactor voltage is utilizedM、pNIt realizes the identification of area's internal and external fault, and event is carried out to troubles inside the sample space
Barrier selects pole, method as follows：If the mutation direction of rectification side and inverter side smoothing reactor voltage is positive direction, i.e. pM=1 and pN
=1, then failure is DC line troubles inside the sample space；If the mutation direction of rectification side smoothing reactor voltage is negative direction, and inversion
The mutation direction of side smoothing reactor voltage is positive direction, i.e. pM=-1 and pN=1, judgement failure is rectification side external area error；If
The mutation direction of rectification side smoothing reactor voltage is positive direction, and the mutation direction of inverter side smoothing reactor voltage is losing side
To i.e. pM=1 and pN=-1, judgement failure is inverter side external area error.
2. longitudinal protection method according to claim 1, which is characterized in that in step (2), judgement rectification side, inverter side
The mutation direction p of smoothing reactor voltageM、pN, as follows using formula
In formula, pi=1 indicates that the mutation direction of the sides i smoothing reactor voltage is positive direction, pi=-1 indicates the sides i smoothing reactor
The mutation direction of voltage is negative direction；I takes M, N, indicates rectification side, inverter side respectively；NTFor the sampled point in the long 5ms of data window
Number；K is integer, takes 1,2,3 ... ..., NT；uM(k) it is rectification side smoothing reactor voltage uMTime-domain sampling value, uN(k) it is inversion
Side smoothing reactor voltage uNTime-domain sampling value；usetFor setting valve, UNFor straight-flow system rated voltage.
3. longitudinal protection method according to claim 1, which is characterized in that in step (2), consider that direct current transducer measures
Error chooses usetFor 0.02UN。
4. longitudinal protection method according to claim 1, which is characterized in that in step (1), for positive transmission line of electricity,
Rectification side smoothing reactor voltage positive direction is to be directed toward positive circuit from converting plant, and inverter side smoothing reactor voltage positive direction is
It is directed toward positive circuit from Inverter Station；For cathode transmission line of electricity, rectification side smoothing reactor voltage positive direction is from anode circuit
It is directed toward converting plant, inverter side smoothing reactor voltage positive direction is to be directed toward Inverter Station from anode circuit.
5. in step (1), rectification side smoothing reactor voltage uMFor positive circuit rectification side smoothing reactor voltage uMpAnd cathode
Line commutation side smoothing reactor voltage uMnThe sum of；Inverter side smoothing reactor voltage uNFor the flat wave reactance of positive circuit inverter side
Device voltage uNpWith anode circuit inverter side smoothing reactor voltage uNnThe sum of.
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Cited By (3)
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| CN111030062A (en) * | 2019-12-06 | 2020-04-17 | 中国电力科学研究院有限公司 | High-voltage direct-current transmission line protection method and device for distinguishing internal and external faults of smoothing reactor |
| CN113589101A (en) * | 2021-07-30 | 2021-11-02 | 华北水利水电大学 | Fault location method and system suitable for direct-current power transmission system |
| CN114243657A (en) * | 2021-12-16 | 2022-03-25 | 上海海事大学 | Rapid protection method for single end quantity of direct current transmission line |
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