CN110429572A - A kind of DC distribution net interpolar failure fast protection method - Google Patents
A kind of DC distribution net interpolar failure fast protection method Download PDFInfo
- Publication number
- CN110429572A CN110429572A CN201910769702.9A CN201910769702A CN110429572A CN 110429572 A CN110429572 A CN 110429572A CN 201910769702 A CN201910769702 A CN 201910769702A CN 110429572 A CN110429572 A CN 110429572A
- Authority
- CN
- China
- Prior art keywords
- inductance
- route
- protection
- boundary
- lmar
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000004224 protection Effects 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 33
- 230000001052 transient effect Effects 0.000 claims abstract description 12
- 230000001939 inductive effect Effects 0.000 claims abstract description 11
- 230000008569 process Effects 0.000 claims abstract description 9
- 238000009434 installation Methods 0.000 claims description 25
- 238000005259 measurement Methods 0.000 claims description 20
- 230000005611 electricity Effects 0.000 claims description 5
- 238000006467 substitution reaction Methods 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 2
- 238000004422 calculation algorithm Methods 0.000 abstract description 7
- 238000004364 calculation method Methods 0.000 abstract description 6
- 230000035945 sensitivity Effects 0.000 abstract description 3
- 238000004088 simulation Methods 0.000 description 5
- 239000000835 fiber Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000007257 malfunction Effects 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 101100499229 Mus musculus Dhrsx gene Proteins 0.000 description 1
- 244000131316 Panax pseudoginseng Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 240000005049 Prunus salicina Species 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 235000009018 li Nutrition 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/006—Calibration or setting of parameters
-
- 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
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention discloses a kind of DC distribution net interpolar failure fast protection method, using fault transient electrical quantity and route RL model, solves the inductance parameters of route, and judge faulty line according to the inductance parameters size；In order to further increase the sensitivity of this method, in every route head end series connection boundary small inductor, and the differential in route RL model is replaced using the inductive drop, the requirement for eliminating truncated error when replacing differential with difference, reducing calculation amount when calculating line inductance parameter while simplifying calculating process, reducing algorithm to sample rate.
Description
Technical field
The invention belongs to field of relay protection in power, are related to flexible direct current power distribution network interpolar fault protecting method.
Background technique
In recent years, the continuous improvement that power demands, power supply reliability, power quality etc. is required with user and
The extensive access of distributed generation resource, energy storage device, DC load, flexible direct current power distribution network is receive more and more attention and grinds
Study carefully, and becomes the important development direction of the following power distribution network.However, flexible direct current power distribution network has " low used compared with AC system
Property, Low ESR " characteristic, once interpolar failure occurs for DC line, the energy-storage travelling wave tube being distributed in DC distribution net is (mainly each
Capacity cell in a inverter) it can quickly release energy to fault point, cause fault current to reach tens of within several milliseconds
Even kilo-amperes up to a hundred, seriously threaten power electronic devices and the safe operation of other electrical equipments.Therefore it needs at several milliseconds
Within reliably complete fault detection and isolation, the quick-action of this centering straightening stream power distribution network relay protection proposes high want
It asks.
And traditional single-end electrical quantity protection (such as: current protection, distance protection) because can not effectively prevent it is adjacent under
This route protection malfunction caused by one route head end failure, the protection of quick-action section can not achieve complete fibre, therefore such is protected
It is difficult to press flexible direct current power distribution network to the high request of protection quick-action in adaptation.Wherein current protection principle is simple, but due to straight
DC line in stream power distribution network is mostly cable run, and line impedance is small, distance is shorter, line end failure and head end failure
Current difference is relatively little, is bound to cause its protection scope according to the setting principle for escaping line end short circuit current and reduces, from
And influence the sensitivity of the protection quick-action section.
(Sun Gang, Shi Bainian, Zhao Yuming, flexible direct current distribution network failure positioning and relaying configuration of the Japanese plum roc based on MMC
Research electric power system protection and control 2015,43 (22): 127-133) the DC distribution net current differential protection that has used at present
Scheme has good quick-action, its reliability will be by communication channel although can guarantee the selectivity of protection from principle
The influence of reliability and two side data synchronisms.
In existing subway, naval vessel direct-flow distribution system, current-rising-rate di/dt and current increment Δ I is generallyd use
The main protection as trailer system is protected, but using the protection of electrical quantity differential, definite value depends on simulation calculation, lacks pervasive
Property fixed value adjusting method, and be resistant to transition resistance ability it is limited.
(Xianyong Feng,Li Qi,Jiuping Pan.A Novel Fault Location Method and
Algorithm for DC Distribution Protection.IEEE Transactions on Industry
Applications, 2017,53 (3): 1834-1840) the DC distribution net event of the inductance parameters identification based on route RL model
Hinder localization method, route RL model is solved using Fault transient data and least square method solution, has obtained protection
To the line inductance of fault point, this method algorithm is relative complex for installation place, and replacing differential with difference, there is also certain truncation mistakes
Difference.
(distance measuring type that the such as Li Meng, Jia Ke, Bi Tianshu are suitable for DC distribution net protects electric power network technique, 2016,40 (3):
The differential in RL model 719-724) is replaced using the voltage drop of inverter exit current-limiting reactor, has obtained line inductance ginseng
Several numerical solution formula, although this method is simple, calculation amount is small, of less demanding to sample frequency, but still can not protection circuit it is complete
It is long, and it is only applicable to the case where inverter exit current-limiting reactor can be as local information, has some limitations.
Summary of the invention
The purpose of the present invention is to provide a kind of DC distribution net interpolar failure fast protection methods, to solve above-mentioned technology
Problem；Energy complete fibre of the present invention, calculation amount is small, be easily achieved, accuracy is high.
In order to achieve the above object, the present invention adopts the following technical scheme:
A kind of DC distribution net interpolar failure fast protection method, comprising the following steps:
Step 1 installs series connection boundary inductance additional in the positive and negative electrode route of DC distribution net protection installation place；
Utilize the voltage for the boundary inductance being installed on protection installation place positive and negative electrode route, substitution protection installation place to event
Differential term between barrier point in route RL model, obtains protection installation place bus voltage across poles udc, positive boundary inductive drop
uLmarp, cathode boundary inductive drop uLmarn, the positive electrode current i of routepAnd route cathodal current inBetween relational expression:
Wherein: uLmar=uLmarp-uLmarm；idc=ip-in；LmarFor the electricity for protecting installation place positive and negative anodes circuit boundary inductance
Inductance value；Lx、RxFor boundary inductance to the line inductance and resistance between fault point；RfFor fault resstance；
Step 2, the protection installation place bus voltage across poles using any two neighbouring sample point in fault transient process
Sampled value udc(k) and udc(k+1), anode boundary inductive drop sampled value uLmarp(k) and uLmarp(k+1), cathode boundary inductance electricity
Press sampled value uLmarn(k) and uLmarn(k+1), route anode current sampling data ip(k) and ip(k+1) and route cathodal current is adopted
Sample value in(k) and in(k+1), u is acquiredLmar(k)=uLmarp(k)-uLmarm(k)、uLmar(k+1)=uLmarp(k+1)-uLmarn(k+
1), idc(k)=ip(k)-in(k)、idc(k+1)=ip(k+1)-in(k+1), and by being f by frequencywLow-pass filtering pair
udc(k)、uLmar(k)、idc(k) and udc(k+1)、uLmar(k+1)、idc(k+1) it is filtered, obtains u "Lmar(k)、u”Lmar
(k)、i”dc(k) and u "Lmar(k+1)、u”Lmar(k+1)、i”dc(k+1), and acquire boundary inductance to fault point line inductance Lx
(k):
Step 3, using the sampled data in fault transient process, calculate a boundary inductance to fault point line inductance
Sequence [Lx(k)], element Lx(k) gained boundary inductance is calculated to the line for protecting installation place for the adjacent sampled point of any two
Then road inductance seeks the average value of all elements in the line inductanceAnd it utilizesConstitute Protection criteria:
Wherein: N is line inductance sequence [L of the boundary inductance to fault pointx(k)] number of element in；LsetFor adjusting
Value；KrelFor safety factor；
Further, LsetNumerical value according to when escaping adjacent next route head end failure this route protection measurement electricity
Sense is to be adjusted, i.e. the setting valve L of this route protectionset=Krel(L+Lmar.next), L is the inductance of this route,
Lmar.nextFor boundary inductance added by next route protection installation place, work as satisfactionWhen protection act.
Further,Lmar2For the boundary inductance of adjacent next route head end.
Compared with the existing technology, the invention has the following advantages: the present invention utilizes fault transient electrical quantity and line
Road RL model solves the inductance parameters of route, and judges faulty line according to the inductance parameters size；In order to further increase this
The sensitivity of method in every small boundary inductance of route head end series connection, and is replaced in route RL model using the inductive drop
Differential eliminates truncated error when replacing differential with difference, reduces calculation amount while the letter when calculating line inductance parameter
The requirement changed calculating process, reduced algorithm to sample rate.
Detailed description of the invention
Fig. 1 is the radial DC distribution net schematic diagram of single-side power；
Fig. 2 is the R-L equivalent circuit diagram of faulty line；
Fig. 3 is DC distribution net electrical-magnetic model；
Fig. 4 is that DC distribution net interpolar failure quickly protects flow chart；
The action situation and measurement of 5 (protections of route L5) are protected when Fig. 5 is the different location route L5 metallicity failure
The relative error of inductance；Wherein Fig. 5 (a) is the average value for measuring inductance；Fig. 5 (b) is the calculating error for measuring inductance；
The action situation and measurement of 5 (protections of route L5) are protected when Fig. 6 is the different location route L6 metallicity failure
The relative error of inductance；Wherein Fig. 6 (a) is the average value for measuring inductance；Fig. 6 (b) is the calculating error for measuring inductance.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings:
In order to illustrate the method for the invention, the radial multistage confession of one shown in FIG. 1 typical single-side power is given
The flexible direct current distribution network line chart of electricity.In order to realize that the single-end electrical quantity complete fibre based on inductance parameters identification is protected
Shield, the inductance (L an of fractional value has been accessed in the protection installation place of every DC linemar) it is used as boundary element (as shown in figure 1
Shown in route L1, route L2 and route L3), which cannot influence system normal operation, while can effectively distinguish again
The failure of this line end and next route head end.
Interpolar failure occurs for the route L1 in the network shown in Fig. 1, and the equivalent circuit of route L1 is as shown in Figure 2, in which: udc
To protect installation place route head end voltage across poles；ip、inRespectively route positive and negative electrode electric current；uLmarp、uLmarnIt is positive and negative for route
Voltage drop on the inductance of pole boundary, the numerical value can be obtained by adding voltage transformer；LxAnd RxFor boundary inductance to fault point
Line resistance and inductance, RfFor fault resstance.
Circuit can obtain according to Fig.2:
And in formula (1):
Have:
LmarFor the inductance value for protecting installation place positive and negative anodes circuit boundary inductance；During parameter identification, use
Difference replaces substitution error caused by differential, with the u in formula (3)Lmarp/LmarAnd uLmarn/LmarInstead of the di in formula (1)p/dt
And din/ dt simultaneously merges similar terms and can obtain:
Utilize the protection installation place bus voltage across poles sampled value of any two neighbouring sample point in fault transient process
udc(k) and udc(k+1), anode boundary inductive drop sampled value uLmarp(k) and uLmarp(k+1), cathode boundary inductive drop samples
Value uLmarn(k) and uLmarn(k+1), route anode current sampling data ip(k) and ip(k+1) and route cathodal current sampled value in
(k) and in(k+1), following equation group can be acquired:
Wherein: idc(k+1)=ip(k+1)-in(k+1), idc(k)=ip(k)-in(k), uLmar(k+1)=uLmarp(k+1)-
uLmarn(k+1), uLmar(k)=uLmarp(k)-uLmarn(k)。
Designing a cutoff frequency is fwLow-pass filter, to idc(k+1)、idc(k)、uLmar(k+1)、uLmar(k)、udc
(k+1)、udc(k) it is filtered to obtain i "dc(k+1)、i”dc(k)、u”Lmar(k+1)、u”Lmar(k)、u”dc(k+1)、u”dc(k),
And be updated to formula (5) and it is solved can the L as shown in formula (6)xAnd RxNumerical solution.Low pass filtered is designed herein
The reason of wave device, is: between route realistic model and RL model there are errors, in order to guarantee arithmetic accuracy, the low-pass filter
Cutoff frequency fwIt should be chosen according to the applicable band of route RL model.(Suo Nanjiale, Wang Xiangbing, Meng Xiang wait base
Quick Directional Element XI AN JIAOTONG UNIVERSITY Subject Index, 2006,40 (6): 689-693 are identified in the parameter of RL model) analyze route
Applicable band of the RL model relative to route realistic model is less than length the route of 100km, the applicable frequency of route RL model
Band is 0-600Hz.For DC distribution net, line length is respectively less than 100km, therefore the cutoff frequency of the filter is answered
Lower than 600Hz, the present invention is using fw=300Hz.
Using the sampled data in fault transient process, and convolution (6) can be in the hope of a measurement inductance sequence [Lx
(k)] L, is then consideredx(k) there is calculating fluctuation, therefore the present invention uses the average value of the calculating inductanceSentence to constitute protection
According to shown in specific criterion such as formula (7), in which: LsetFor protection seting value.
In order to guarantee the selectivity of the mentioned guard method of the present invention, LsetAccording to escaping adjacent next route head end failure
When this route protection measurement inductance adjusted, then the adjusting electric induction of this route meets (with route L1 shown in FIG. 1
For):
Lset1=Krel(LL1+Lmar2) (8)
In formula (8): LL1For the inductance of the whole route of L1；Lmar2For the boundary inductance of adjacent next route head end；KrelFor
Safety factor, since protection is deficient amount protection in text, therefore 0 < Krel< 1, specific value is considered as transformer error, parameter is surveyed
Measure error, protective device error condition.
Simultaneously in order to guarantee this line end failure when protection not tripping and boundary inductance validity, protection it is whole
Definite value should also meet:
Lset1>L1 (9)
Joint type (8) and formula (9), under the value of boundary resistance added by the adjacent next route protection installation place that can be asked
Limit:
It should be noted that the boundary inductance L of protection installation placemarIt should should be taken slightly in the case where not influencing the normal situation of system
Greatly a bit.Such as in embodiment, work as KrelTake 0.9, LL1When for 2.8mH, L can be calculated according to formula (10)mar2It should be greater than
0.311, according to the L in mentioned above principle embodimentmar2Value is 1mH.
It is visible by above-mentioned analysis: to replace the differential in formula (1) using the voltage on the inductance of boundary, not only eliminate difference
Instead of the substitution error of differential, while matrix operation when solving line parameter circuit value using least square method is avoided, calculation amount is small,
Process is simple, is identified using Temporal Data to failure, can quickly cut off failure in several milliseconds.
Fig. 4 is the specific implementation flow of protection philosophy of the present invention.
Embodiment
DC distribution net electrical-magnetic model shown in FIG. 1 is built in PSCAD/EMTP, electrical-magnetic model is such as
Shown in Fig. 3.In the model, the every phase upper and lower bridge arm of MMC by 10 half-bridge submodules (Half Bridge Sub-Module,
HBSM it) is connected in series, modulation system is that nearest level approaches modulation (Nearest Level Modulation, NLM), is controlled
Mode is to determine DC voltage and determine Reactive Power Control；Circuit model is connected in series by multiple π models, wherein every 500m is equivalent to
One π model；Since load and its adapter are unrelated with 0 mould fault network of DC distribution net, therefore it is equivalent to a permanent resistance
Model；Other parameters are then shown in Table 1.
1 simulation model relevant parameter of table
The sample rate of the model is 20kHz, and every two sampled point just can calculate a measurement inductance Lx.In view of measurement
Inductance calculates fluctuation, is solved in the embodiment of the present invention using data within 0.002s after fault moment and measures inductance, and utilizes institute
It seeks the average value of inductance and calculates fluctuation as Protection criteria.If meter and measurement delay are (when its current-rising-rate is in 100A/ μ s
Within when, the time of measuring of Hall sensor is no more than 3 μ s), algorithm delay (is no more than using algorithm delay when high speed processor
Number μ s) and dc circuit breaker actuation time (0.1ms or so).It can be seen that protection philosophy of the present invention can 5ms with
Interior quick acting can satisfy DC distribution net to the high request of protection speed.
In order to verify the accuracy and correctness of protection philosophy of the present invention, the emulation in the embodiment of the present invention is utilized
Model and its emulation data verify it.
In embodiment, the interpolar event of route L5 and route L6 under different location, different faults resistance is simulated first
Barrier, and the average measurement impedance using fault simulation data to L5 protection installation placeCalculating fluctuation σ 5, (specific calculate sees formula
(11)) and calculate relative error α calculated, by verify protection philosophy of the present invention under the conditions of different faults in terms of
Accuracy is calculated, specific calculated result is as shown in table 2.
L5 protects installation place under the conditions of 2 different faults of tableσ 5 and α
Shown in table 2 the result shows that:
(1) for this method at metallicity failure (Rf=0 Ω), the calculating fluctuation of average measurement inductance and relative error are very
It is small；With the increase of fault resstance, average measurement inductance constantly reduces, and calculates fluctuation and calculate error and increase.
(2) when fault point distance protection installation place is closer, average measurement inductance calculates fluctuation and calculates error by failure
The influence of resistance is bigger, when especially this section of route head end is through fault resstance failure, this section of route protection and upper level route
Average measurement inductance significantly reduces, and will go out when the average measurement inductance value of upper level route protection meets Protection criteria
Existing steady-state phenomenon.
And there is the reason of above-mentioned phenomenon and be: with the increase of fault resstance, the error of the built mathematical modulo of the present invention and
And it increases with it, therefore biggish deviation also occurs in the numerical value for thus calculating resulting measurement inductance.
But since protection philosophy of the present invention is based on transient state electric quantity information, actuation time is fast, and for interpolar
For the fault resstance of failure, the fault resstance at failure initial stage is mainly arc resistance, and numerical value is smaller (close to zero), therefore
As long as the interpolar failure based on fault transient electrical quantity, which is quickly protected, can guarantee that high accuracy can expire when fault resstance is smaller
Foot requires, and from simulation result: protection philosophy of the present invention guarantees very high precision when fault resstance is close to 0
(calculate error and be less than < 10%).
In these cases, the present embodiment carries out the metallicity interpolar failure under route L5, L6 different faults position
Emulation is calculated using measurement inductance of the emulation data to 5 (protections of route L5) of protection, and makes itself and setting valve (its number
Value is as shown in table 3) it is compared, to verify protection philosophy of the present invention whether being capable of action message, i.e. this line-internal
Not malfunction when failure, specific simulation result are as shown in Figure 5 and Figure 6 other than not tripping, this route when failure.It is protected in the present embodiment
The each setting valve value for protecting criterion is as shown in table 3.
The protection definite value table of L5 under the conditions of 3 different faults of table
| Lmar5 | 1mH | Lset5 | 3.42mH |
| Lmar5 | 1mH | σset | 10% |
| Krel | 0.85 | - | - |
The waveform shown in Fig. 5 and Fig. 6:
(1) guard method of the present invention protects the measurement of 5 (protections of route L5) in route L5 any point failure
Inductance average value, which is respectively less than, adjusts inductance, can accomplish complete fibre；And any point failure on next route L6, protect 5
Measurement inductance average value is all larger than adjusting inductance, therefore not malfunction when external area error.
(2) route L5 and when next stage circuit L6 different location failure, is not considering failure using fault transient electrical quantity
In the case where resistance, the calculating error of measurement inductance ensure that the correctness of algorithm within the scope of ± 5% at protection 5.
Claims (3)
1. a kind of DC distribution net interpolar failure fast protection method, which comprises the following steps:
Step 1 installs series connection boundary inductance additional in the positive and negative electrode route of DC distribution net protection installation place；
Using be installed at protection installation place positive and negative electrode route coboundary inductance voltage, substitution protection installation place to fault point it
Between differential term in route RL model, obtain protection installation place bus voltage across poles udc, anode boundary inductive drop uLmarp, it is negative
Pole boundary inductive drop uLmarn, the positive electrode current i of routepAnd route cathodal current inBetween relational expression:
Wherein: uLmar=uLmarp-uLmarm；idc=ip-in；LmarFor the inductance value for protecting installation place positive and negative anodes circuit boundary inductance；
Lx、RxFor boundary inductance to the line inductance and resistance between fault point；RfFor fault resstance；
Step 2 is sampled using the protection installation place bus voltage across poles of any two neighbouring sample point in fault transient process
Value udc(k) and udc(k+1), anode boundary inductive drop sampled value uLmarp(k) and uLmarp(k+1), cathode boundary inductive drop is adopted
Sample value uLmarn(k) and uLmarn(k+1), route anode current sampling data ip(k) and ip(k+1) and route cathodal current sampled value
in(k) and in(k+1), u is acquiredLmar(k)=uLmarp(k)-uLmarm(k)、uLmar(k+1)=uLmarp(k+1)-uLmarn(k+1), idc
(k)=ip(k)-in(k)、idc(k+1)=ip(k+1)-in(k+1), and by being f by frequencywLow-pass filtering to udc(k)、
uLmar(k)、idc(k) and udc(k+1)、uLmar(k+1)、idc(k+1) it is filtered, obtains u "Lmar(k)、u”Lmar(k)、i”dc
(k) and u "Lmar(k+1)、u”Lmar(k+1)、i”dc(k+1), and acquire boundary inductance to fault point line inductance Lx(k):
Step 3, using the sampled data in fault transient process, calculate a boundary inductance to fault point line inductance sequence
[Lx(k)], element Lx(k) gained boundary inductance is calculated to the line electricity for protecting installation place for the adjacent sampled point of any two
Sense, then seeks the average value of all elements in the line inductanceAnd it utilizesConstitute Protection criteria:
Wherein: N is line inductance sequence [L of the boundary inductance to fault pointx(k)] number of element in；LsetFor setting valve；Krel
For safety factor.
2. a kind of DC distribution net interpolar failure fast protection method according to claim 1, which is characterized in that Lset's
Numerical value is adjusted according to the measurement inductance of this route protection when escaping adjacent next route head end failure, i.e. this route
The setting valve L of protectionset=Krel(L+Lmar.next), L is the inductance of this route, Lmar.nextIt is installed for next route protection
The boundary inductance that place adds, works as satisfactionWhen protection act.
3. a kind of DC distribution net interpolar failure fast protection method according to claim 2, which is characterized in thatLmar2For the boundary inductance of adjacent next route head end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910769702.9A CN110429572B (en) | 2019-08-20 | 2019-08-20 | Rapid protection method for interelectrode fault of direct-current power distribution network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910769702.9A CN110429572B (en) | 2019-08-20 | 2019-08-20 | Rapid protection method for interelectrode fault of direct-current power distribution network |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110429572A true CN110429572A (en) | 2019-11-08 |
| CN110429572B CN110429572B (en) | 2021-03-16 |
Family
ID=68417130
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910769702.9A Active CN110429572B (en) | 2019-08-20 | 2019-08-20 | Rapid protection method for interelectrode fault of direct-current power distribution network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110429572B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6392422B1 (en) * | 1997-06-17 | 2002-05-21 | Dip.-Ing. Walther Bender Gmbh & Co. Kg | Monitoring insulation and fault current in an A/C current network to provide load shutoff whenever differential current exceeds a certain response value |
| CN107681641A (en) * | 2017-08-01 | 2018-02-09 | 华北电力大学 | Multiterminal flexible direct current power network boundary protection method based on direct current reactor voltage |
| CN108469576A (en) * | 2018-04-20 | 2018-08-31 | 中国科学院电工研究所 | A kind of multiterminal alternating current-direct current mixing power distribution network DC Line Fault detection method |
| CN109188188A (en) * | 2018-07-10 | 2019-01-11 | 国网浙江省电力有限公司杭州供电公司 | The single-ended method of discrimination of Multi-end flexible direct current transmission line fault based on voltage monitoring |
| CN109839570A (en) * | 2019-03-07 | 2019-06-04 | 中国电力科学研究院有限公司 | A kind of multiterminal alternating current-direct current mixing power distribution network direct current high resistive fault detection method and device |
-
2019
- 2019-08-20 CN CN201910769702.9A patent/CN110429572B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6392422B1 (en) * | 1997-06-17 | 2002-05-21 | Dip.-Ing. Walther Bender Gmbh & Co. Kg | Monitoring insulation and fault current in an A/C current network to provide load shutoff whenever differential current exceeds a certain response value |
| CN107681641A (en) * | 2017-08-01 | 2018-02-09 | 华北电力大学 | Multiterminal flexible direct current power network boundary protection method based on direct current reactor voltage |
| CN108469576A (en) * | 2018-04-20 | 2018-08-31 | 中国科学院电工研究所 | A kind of multiterminal alternating current-direct current mixing power distribution network DC Line Fault detection method |
| CN109188188A (en) * | 2018-07-10 | 2019-01-11 | 国网浙江省电力有限公司杭州供电公司 | The single-ended method of discrimination of Multi-end flexible direct current transmission line fault based on voltage monitoring |
| CN109839570A (en) * | 2019-03-07 | 2019-06-04 | 中国电力科学研究院有限公司 | A kind of multiterminal alternating current-direct current mixing power distribution network direct current high resistive fault detection method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110429572B (en) | 2021-03-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3605773B1 (en) | Safe operation method for voltage reduction and arc suppression of ground fault phase of non-effective grounding system | |
| CN106680670B (en) | A kind of flexible direct current power distribution network monopolar grounding fault recognition methods and device | |
| Liao et al. | Online optimal transmission line parameter estimation for relaying applications | |
| Zhang et al. | Non-unit traveling wave protection of HVDC grids using Levenberg–Marquart optimal approximation | |
| Jia et al. | Distance protection scheme for DC distribution systems based on the high-frequency characteristics of faults | |
| CN102361321B (en) | 110/220 kV transformers' neutral point grounding via small reactance | |
| CN103728532A (en) | Power distribution network single-phase grounding fault judging and locating method | |
| CN107394807A (en) | A kind of multi-infeed HVDC commutation failure fast evaluation method | |
| CN104377667B (en) | High-voltage direct-current line pilot protection method based on boundary energy | |
| Ha et al. | Novel scheme of travelling wave based differential protection for bipolar HVDC transmission lines | |
| CN105842583A (en) | Distribution network single-phase grounding section positioning method based on fault phase voltage and current abrupt change | |
| CN101915888B (en) | Extensible fusion identification method for lightening interference of +/-800kV direct current transmission line | |
| CN103293446A (en) | Small-current grounding fault line selection method based on arc suppression coil | |
| CN111781461B (en) | Ground fault line selection and section determination method for small-current grounding power system | |
| CN107085182B (en) | A kind of high-voltage circuitbreaker resistance to shorting current capacity check method | |
| CN105552861A (en) | Adaptive current protection algorithm | |
| CN106385012B (en) | Feeder line zero-sequence protection method and device | |
| CN107508265B (en) | Small resistance grounding system high resistance earthing protecting method and system | |
| Gajare et al. | Synchrophasor-based intelligent autoreclosing scheme for series compensated transmission lines | |
| CN102818973A (en) | Phase sequence voltage amplitude comparison-based failure phase selection method and device | |
| Abasi et al. | Fault classification and fault area detection in GUPFC-compensated double-circuit transmission lines based on the analysis of active and reactive powers measured by PMUs | |
| CN110824294A (en) | Flexible direct-current power distribution network bipolar short-circuit fault section identification and distance measurement method | |
| CN107516878B (en) | Intermittent high resistance earthing protecting method and system | |
| CN109327007B (en) | Same-tower multi-circuit zero-sequence compensation coefficient setting device and method based on station domain information | |
| CN104052033B (en) | A kind of guard method based on zero-sequence current correlation coefficient identification fault branch |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20240515 Address after: No. 669, Aerospace Middle Road, National Civil Aerospace Industry Base, Xi'an City, Shaanxi Province 710199 Patentee after: Electric Power Research Institute of State Grid Shaanxi Electric Power Co.,Ltd. Country or region after: China Patentee after: XI'AN JIAOTONG University Patentee after: STATE GRID CORPORATION OF CHINA Address before: No.669, Hangtian Middle Road, Chang'an District, Xi'an City, Shaanxi Province Patentee before: STATE GRID SHAANXI ELECTRIC POWER Research Institute Country or region before: China Patentee before: XI'AN JIAOTONG University Patentee before: STATE GRID CORPORATION OF CHINA |