CN108767820A - A kind of novel direction protection method suitable for multi-terminal direct current transmission system - Google Patents
A kind of novel direction protection method suitable for multi-terminal direct current transmission system Download PDFInfo
- Publication number
- CN108767820A CN108767820A CN201810590898.0A CN201810590898A CN108767820A CN 108767820 A CN108767820 A CN 108767820A CN 201810590898 A CN201810590898 A CN 201810590898A CN 108767820 A CN108767820 A CN 108767820A
- Authority
- CN
- China
- Prior art keywords
- protection
- fault
- backward
- wave
- direct current
- 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
- 230000005540 biological transmission Effects 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000009434 installation Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- 238000011217 control strategy Methods 0.000 abstract description 6
- 230000004044 response Effects 0.000 abstract description 5
- 230000035945 sensitivity Effects 0.000 abstract description 4
- 230000001681 protective effect Effects 0.000 description 5
- 238000005070 sampling Methods 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000033772 system development Effects 0.000 description 1
Classifications
-
- 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
- H02H7/265—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 making use of travelling wave theory
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
-
- 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
-
- 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
- H02H7/28—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 meshed systems
-
- 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
-
- 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]
Landscapes
- Engineering & Computer Science (AREA)
- Emergency Protection Circuit Devices (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Power Engineering (AREA)
Abstract
The invention discloses a kind of novel traveling wave direction protection methods suitable for multi-terminal direct current transmission system.Calculate the window t when fault direction judges0Backward-travelling wave at each sampled point j moment in~t, this route protection 1 and each 2~k of route protection of back side；Traversal obtains t respectively0Backward-travelling wave amplitude maximum in the~t periods at 1~k of protection, sampled point are denoted as j respectively1_max、j2_max、…、jk_max；The sum of the amplitude of the backward-travelling wave maximum amplitude and its latter two sampled point at 1~k of protection is calculated separately, fault direction COEFFICIENT K is calculated2~Kk；If K2~KkIt is all higher than zero, then is positive direction failure, otherwise, that is, is judged as negative direction line fault.Compared with prior art, novel traveling wave direction protection method proposed by the present invention needs not rely upon line boundary element；And compared with traveling wave direction criterion of the tradition based on forward and reverse traveling-wave ratio, this method is applied to that the influence of current conversion station control strategy nonlinear response can be avoided when DC transmission system, greatly improves the sensitivity and reliability of fault direction judgement.
Description
Technical field
The present invention relates to DC transmission system relay protection field, more particularly to a kind of novel traveling wave direction of DC line is protected
Maintaining method.
Background technology
DC line protection is one of the key technology of straight-flow system development, wherein quickly, reliable failure judgement direction be
DC line quickly protects essential key link.Direction criterion based on current change quantity by transition Resistance Influence compared with
It (may be judged by accident when through great transition Resistance Fault) greatly；Direction criterion based on current changing rate is then in long transmission line situation
Under due to being influenced positive negative variation occur by capacitance current, can not reliable failure judgement direction.
Currently, in multi-terminal direct current transmission system, when circuit both ends are there are when the boundary elements such as direct current reactor, side can rely on
Boundary's element carries out fault direction judgement to the fault signature difference that forward and reverse failure generates.Such as patent《A kind of multiterminal flexible direct current
Power network line direction pilot protection method》The judgement of fault direction is carried out based on reactor both sides transient voltage Amplitude Ration.However
Above-mentioned direction criterion installs direct current reactor dependent on every DC line both ends, equilateral without reactor for circuit both ends
The case where boundary's element, can not then use.In AC transmission system, traditional traveling wave direction based on forward and reverse traveling-wave ratio is not necessarily to side
Boundary's element.Such as document《The research of Ultra-high-speed Transient-based Directional Relay》It is proposed the AC transmission system based on forward and reverse traveling-wave ratio
Traveling wave direction criterion being capable of reliable failure judgement direction.However, it is because exchanging defeated that this method can be applicable in AC system
Electric system is a linear system, and the traveling wave of power supply generation can be directly ignored when failure sequence network is analyzed.In straight-flow system
In, current conversion station control strategy can generate failure strong control response after failure, generate can not reliable analysis calculate it is attached
Add traveling wave.I.e. straight-flow system is a nonlinearity system, the base proposed premised on linear system in AC transmission system
It will be difficult to reliably be applicable in the conventional direction criterion of forward and reverse traveling-wave ratio.
For this present situation, it is necessary to design a kind of suitable for multi-terminal direct current transmission system, fast and reliable direction guarantor
Maintaining method, to ensure the reliable judgement in DC line fault direction.
Invention content
For multi-terminal direct current transmission system, especially Multi-end flexible direct current transmission system, there are a plurality of outlets of DC bus
Situation, the present invention propose a kind of novel direction protection method suitable for multi-terminal direct current transmission system, it is proposed that independent of
Line boundary, not by current conversion station control strategy nonlinear response influenced based on each direct current outlet backward-travelling wave ratio of bus rod
Novel traveling wave direction criterion, greatly improve fault direction judgement sensitivity and reliability.
The present invention a kind of novel traveling wave direction protection method suitable for multi-terminal direct current transmission system, this method include with
Lower step：
Step 1, note protection Startup time are t0, calculate window when fault direction judges：Window is t when fault direction being taken to judge0~
T, wherein t=t0+min(2l1/v、2l2/ v ..., 2lk/v)-Δt；l1、l2、…、lkIndicate each direct current outlet of bus rod
Length, Δ t be time abundant value, v be the spread speed of traveling wave in the line；
After step 2, fault direction criterion start, t is acquired0In~t the periods, this route protection 1 is protected with each circuit of back side
Protect the positive DC voltage U at 2~kp1, Up2..., Upk, negative DC voltage Un1, Un2..., UnkWith positive DC electric current Ip1,
Ip2..., Ipk, negative DC electric current In1, In2..., Ink；Calculate the Aerial mode component U of voltage at 1~k of protection1, U2..., UkWith
The Aerial mode component I of electric current1, I2..., Ik, as shown in formula (1), formula (2)：
And calculate the fault component Δ U of above-mentioned voltage and current Aerial mode component1, Δ U2..., Δ UkWith Δ I1, Δ
I2..., Δ Ik,；Respectively as shown in formula (3), formula (4)：
Wherein, UdcTo protect the Aerial mode component of 1~k installation site DC voltages under system normal operation；
Wherein, Idc1、Idc2、…、IdckTo protect the line mould of the places 1~k circuit DC current under system normal operation
Component；
Step 3 calculates separately t0Each sampled point j moment in the~t periods, this route protection 1 and back side route protection 2~
Backward-travelling wave at k, following formula (5)：
Wherein, Zc1, Zc2..., ZckFor the line mould wave impedance of circuit where 1~k of protection；
Step 4, traversal obtains t respectively0Backward-travelling wave amplitude maximum in the~t periods at 1~k of protection, sampled point
It is denoted as j respectively1_max、j2_max、…、jk_max；It calculates separately the backward-travelling wave maximum amplitude at 1~k of protection and its latter two is adopted
The sum of amplitude of sampling point, as shown in formula (6)：
Step 5 calculates fault direction coefficient, following formula (7)：
If step 6, K2~KkIt is all higher than zero, then is positive direction failure, otherwise, that is, is judged as negative direction line fault；Tool
The following formula of body criterion (8)：
Compared with prior art, novel traveling wave direction protection method proposed by the present invention needs not rely upon line boundary member
Part；And compared with traveling wave direction criterion of the tradition based on forward and reverse traveling-wave ratio, this method is applied to energy when DC transmission system
The influence of current conversion station control strategy nonlinear response is enough avoided, sensitivity and reliability that fault direction judges are provided significantly.
Description of the drawings
Fig. 1 is three end DC transmission system schematic diagrames.
Fig. 2 is the transmission process of fault traveling wave when protecting positive direction failure.
Fig. 3 is the transmission process of fault traveling wave when protecting reverse direction failure；
Fig. 4 is a kind of novel traveling wave direction protection method overall flow figure suitable for multi-terminal direct current transmission system.
Specific implementation mode
Embodiments of the present invention are described in further detail below in conjunction with attached drawing.
For multi-terminal direct current transmission system, DC line is directly interconnected in DC fields through DC bus, and direct current reactor
Equal boundary elements may only be installed on current conversion station outlet so that the direction criterion based on boundary element can not be applicable in.And it exchanges defeated
In electric system based on the direction criterion of forward and reverse traveling-wave ratio in DC transmission system then due to by current conversion station control strategy shadow
The case where ringing and being likely to occur sensitivity, reliability reduction.For this purpose, the present invention, which proposes one kind, being suitable for multi-terminal HVDC transmission
The novel traveling wave direction protection method of system.
By taking three end DC transmission systems as shown in Figure 1 as an example, in figure：BUS is DC convergent current bus bar；M, N is respectively two
Direct current outlet Line1(length is set as l1)、Line2(length is set as l2) protective device in bus rod side；Protective device M
The DC voltage that place measures is UM, DC current IM；The DC voltage measured at protective device N is UN, DC current IN。
By taking protective device M as an example：
When positive failure occurs, the transmission process of fault traveling wave is as shown in Figure 2.By as shown in Figure 2, although confluence is female
The response of current conversion station control strategy will produce additional traveling wave at line, but what it mainly influenced is direct wave.And back side circuit
Protective device N is in fault initiating moment t0To t0+2l2The backward-travelling wave measured in/v the periods still meets uN=0, v are
The spread speed of traveling wave in the line.Therefore in t0To t0+2l2There are following relationship in the/v periods：
When back side line fault occurs, the transmission process of fault traveling wave is as shown in Figure 3.Similarly, in t0To t0+2l1/v
There are following relationship in period：
According to above-mentioned principle, and consider that engineering actually accordingly derives formula (9)~(10), proposed by the present invention one
Kind is as follows suitable for the novel traveling wave direction protection method of multi-terminal direct current transmission system：
Step 1, note protection Startup time are t0, calculate window when fault direction judges：Window is t when fault direction being taken to judge0~
T, wherein t=t0+min(2l1/v、2l2/ v ..., 2lk/v)-Δt；l1、l2、…、lkIndicate each direct current outlet of bus rod
Length, Δ t be time abundant value, v be the spread speed of traveling wave in the line；
After step 2, fault direction criterion start, t is acquired0In~t the periods, this route protection 1 is protected with each circuit of back side
Protect the positive DC voltage U at 2~kp1, Up2..., Upk, negative DC voltage Un1, Un2..., UnkWith positive DC electric current Ip1,
Ip2..., Ipk, negative DC electric current In1, In2..., Ink；Calculate the Aerial mode component U of voltage at 1~k of protection1, U2..., UkWith
The Aerial mode component I of electric current1, I2..., Ik, as shown in formula (1), formula (2)：
And calculate the fault component Δ U of above-mentioned voltage and current Aerial mode component1, Δ U2..., Δ UkWith Δ I1, Δ
I2..., Δ Ik,；Respectively as shown in formula (3), formula (4)：
Wherein, UdcTo protect the Aerial mode component of 1~k installation site DC voltages under system normal operation；
Wherein, Idc1、Idc2、…、IdckTo protect the line mould of the places 1~k circuit DC current under system normal operation
Component；
Step 3 calculates separately t0Each sampled point j moment in the~t periods, this route protection 1 and back side route protection 2~
Backward-travelling wave at k, following formula (5)：
Wherein, Zc1, Zc2..., ZckFor the line mould wave impedance of circuit where 1~k of protection；
Step 4, traversal obtains t respectively0Backward-travelling wave amplitude maximum in the~t periods at 1~k of protection, sampled point
It is denoted as j respectively1_max、j2_max、…、jk_max；It calculates separately the backward-travelling wave maximum amplitude at 1~k of protection and its latter two is adopted
The sum of amplitude of sampling point, as shown in formula (6)：
Step 5 calculates fault direction coefficient, following formula (7)：
If step 6, K2~KkIt is all higher than zero, then is positive direction failure, otherwise, that is, is judged as negative direction line fault；Tool
The following formula of body criterion (8)：
Claims (1)
1. a kind of novel traveling wave direction protection method suitable for multi-terminal direct current transmission system, which is characterized in that female based on confluence
Judgement of each direct current outlet backward-travelling wave of line than carrying out fault direction, this approach includes the following steps：
Step (1), note protection Startup time are t0, calculate window when fault direction judges：Window is t when fault direction being taken to judge0~t,
Wherein t=t0+min(2l1/v、2l2/ v ..., 2lk/v)-Δt；l1、l2、…、lkIndicate the length of each direct current outlet of bus rod
Degree, Δ t are time abundant value, and v is the spread speed of traveling wave in the line；
After step (2), fault direction criterion start, t is acquired0In~t the periods, each route protection of this route protection 1 and back side 2
Positive DC voltage U at~kp1, Up2..., Upk, negative DC voltage Un1, Un2..., UnkWith positive DC electric current Ip1,
Ip2..., Ipk, negative DC electric current In1, In2..., Ink；Calculate the Aerial mode component U of voltage at 1~k of protection1, U2..., UkAnd electricity
The Aerial mode component I of stream1, I2..., Ik, it is shown below：
And calculate the fault component Δ U of above-mentioned voltage and current Aerial mode component1, Δ U2..., Δ UkWith Δ I1, Δ I2..., Δ
Ik,；It is shown below：
Wherein, UdcTo protect the Aerial mode component of 1~k installation site DC voltages under system normal operation；Idc1、Idc2、…、
IdckTo protect the Aerial mode component of the places 1~k circuit DC current under system normal operation.
Step (3) calculates separately t0At each sampled point j moment in the~t periods, this route protection 1 and 2~k of back side route protection
Backward-travelling wave, be shown below：
Wherein, Zc1, Zc2..., ZckFor the line mould wave impedance of circuit where 1~k of protection；
Step (4), traversal obtains t respectively0Backward-travelling wave amplitude maximum in the~t periods at 1~k of protection, sampled point difference
It is denoted as j1_max、j2_max、…、jk_max；Calculate separately backward-travelling wave maximum amplitude at 1~k of protection and its latter two sampled point
The sum of amplitude is shown below：
Step (5) calculates fault direction coefficient, is shown below：
Step (6) if, K2~KkIt is all higher than zero, then is positive direction failure, otherwise, that is, is judged as negative direction line fault；Specifically sentence
According to such as following formula：
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810590898.0A CN108767820B (en) | 2018-06-09 | 2018-06-09 | Traveling wave direction protection method suitable for multi-terminal direct current transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810590898.0A CN108767820B (en) | 2018-06-09 | 2018-06-09 | Traveling wave direction protection method suitable for multi-terminal direct current transmission system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108767820A true CN108767820A (en) | 2018-11-06 |
| CN108767820B CN108767820B (en) | 2019-12-27 |
Family
ID=63999695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810590898.0A Expired - Fee Related CN108767820B (en) | 2018-06-09 | 2018-06-09 | Traveling wave direction protection method suitable for multi-terminal direct current transmission system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108767820B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110112717A (en) * | 2019-05-31 | 2019-08-09 | 天津大学 | A kind of half-wave power transmission line protection method based on wave property impedance |
| CN110794259A (en) * | 2019-10-31 | 2020-02-14 | 南方电网科学研究院有限责任公司 | Alternating current-direct current line-touching fault line selection method and device and computer readable storage medium |
| CN110907751A (en) * | 2019-11-28 | 2020-03-24 | 国网江苏省电力有限公司电力科学研究院 | Direct-current power distribution network fault line selection method, device and system based on directional traveling waves |
| CN111628485A (en) * | 2020-04-15 | 2020-09-04 | 南方电网科学研究院有限责任公司 | Line protection method and system for three-terminal direct-current power transmission system |
| CN113702757A (en) * | 2021-08-13 | 2021-11-26 | 天津大学 | Direct-current distribution network rapid direction protection method based on current/voltage high-frequency traveling wave ratio |
| CN115267419A (en) * | 2022-06-22 | 2022-11-01 | 天津大学 | Flexible direct current line direction longitudinal protection method independent of line parameters and boundary elements |
| CN115308638A (en) * | 2022-08-30 | 2022-11-08 | 天津大学 | Fault line identification method suitable for multi-terminal direct-current power transmission system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110227581A1 (en) * | 2004-07-15 | 2011-09-22 | Cooper Technologies Company | Traveling wave based relay protection |
| US20130015878A1 (en) * | 2011-06-20 | 2013-01-17 | Erlphase Power Technologies Limited | Power system fault zone detection |
| CN105510770A (en) * | 2015-12-04 | 2016-04-20 | 昆明理工大学 | Power transmission line one-terminal fault location method based on faulty traveling wave distribution characters along the line within two successive time windows |
| CN106058828A (en) * | 2016-07-18 | 2016-10-26 | 天津大学 | Multi-terminal flexible DC power grid line direction pilot protection method |
| CN106771868A (en) * | 2016-12-20 | 2017-05-31 | 北京交通大学 | A kind of flexible direct current distribution system fault locating method based on traveling wave |
| CN107179474A (en) * | 2017-05-12 | 2017-09-19 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of pair of bus rod multiterminal element circuit fault distance measurement |
-
2018
- 2018-06-09 CN CN201810590898.0A patent/CN108767820B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110227581A1 (en) * | 2004-07-15 | 2011-09-22 | Cooper Technologies Company | Traveling wave based relay protection |
| US20130015878A1 (en) * | 2011-06-20 | 2013-01-17 | Erlphase Power Technologies Limited | Power system fault zone detection |
| CN105510770A (en) * | 2015-12-04 | 2016-04-20 | 昆明理工大学 | Power transmission line one-terminal fault location method based on faulty traveling wave distribution characters along the line within two successive time windows |
| CN106058828A (en) * | 2016-07-18 | 2016-10-26 | 天津大学 | Multi-terminal flexible DC power grid line direction pilot protection method |
| CN106771868A (en) * | 2016-12-20 | 2017-05-31 | 北京交通大学 | A kind of flexible direct current distribution system fault locating method based on traveling wave |
| CN107179474A (en) * | 2017-05-12 | 2017-09-19 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of pair of bus rod multiterminal element circuit fault distance measurement |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110112717A (en) * | 2019-05-31 | 2019-08-09 | 天津大学 | A kind of half-wave power transmission line protection method based on wave property impedance |
| CN110112717B (en) * | 2019-05-31 | 2021-01-05 | 天津大学 | Half-wavelength power transmission line protection method based on wave characteristic impedance |
| CN110794259A (en) * | 2019-10-31 | 2020-02-14 | 南方电网科学研究院有限责任公司 | Alternating current-direct current line-touching fault line selection method and device and computer readable storage medium |
| CN110794259B (en) * | 2019-10-31 | 2021-11-19 | 南方电网科学研究院有限责任公司 | Alternating current-direct current line-touching fault line selection method and device and computer readable storage medium |
| CN110907751B (en) * | 2019-11-28 | 2022-10-18 | 国网江苏省电力有限公司电力科学研究院 | Direct-current power distribution network fault line selection method, device and system based on directional traveling waves |
| CN110907751A (en) * | 2019-11-28 | 2020-03-24 | 国网江苏省电力有限公司电力科学研究院 | Direct-current power distribution network fault line selection method, device and system based on directional traveling waves |
| CN111628485A (en) * | 2020-04-15 | 2020-09-04 | 南方电网科学研究院有限责任公司 | Line protection method and system for three-terminal direct-current power transmission system |
| CN111628485B (en) * | 2020-04-15 | 2022-04-12 | 南方电网科学研究院有限责任公司 | Line protection method and system for three-terminal direct-current power transmission system |
| CN113702757B (en) * | 2021-08-13 | 2022-05-17 | 天津大学 | Direct-current distribution network rapid direction protection method based on current/voltage high-frequency traveling wave ratio |
| CN113702757A (en) * | 2021-08-13 | 2021-11-26 | 天津大学 | Direct-current distribution network rapid direction protection method based on current/voltage high-frequency traveling wave ratio |
| CN115267419A (en) * | 2022-06-22 | 2022-11-01 | 天津大学 | Flexible direct current line direction longitudinal protection method independent of line parameters and boundary elements |
| CN115308638A (en) * | 2022-08-30 | 2022-11-08 | 天津大学 | Fault line identification method suitable for multi-terminal direct-current power transmission system |
| CN115308638B (en) * | 2022-08-30 | 2024-08-20 | 天津大学 | Fault line identification method suitable for multi-terminal direct current transmission system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108767820B (en) | 2019-12-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108767820A (en) | A kind of novel direction protection method suitable for multi-terminal direct current transmission system | |
| CN106058828B (en) | A kind of multiterminal flexible direct current power network line direction pilot protection method | |
| CN105866615B (en) | 10kV distribution line disconnection fault determination method based on three-phase voltage current | |
| CN105891680B (en) | 10kV distribution line multiphase disconnection fault determination method based on three-phase voltage current | |
| CN101813736B (en) | Distance protection measurement method for double circuit lines on same tower | |
| CN102820643A (en) | High voltage direct current power transmission line protection method based on voltage and current mutation direction | |
| CN107390046A (en) | A kind of high voltage direct current transmission line fault type judgement method | |
| CN102590654B (en) | Element and method for discriminating fault electrode of DC transmission line | |
| CN101593964B (en) | Method for longitudinal zero-sequence power direction protection of double circuit line on same pole | |
| CN107276047B (en) | A kind of method in quick discrimination line fault direction | |
| CN109901013B (en) | Method for judging fault direction of power distribution network by using polarity of current and voltage sudden change | |
| CN110542827B (en) | Method and system for judging fault direction of power distribution network containing inverter type power supply | |
| CN107681641A (en) | Multiterminal flexible direct current power network boundary protection method based on direct current reactor voltage | |
| CN101515715A (en) | WAN-based method for protecting feeder line containing distributed power | |
| CN106463950B (en) | DC grid guard method and its system | |
| CN109066610B (en) | Island power grid line fault positioning method | |
| CN109387732A (en) | A kind of adaptive in-situ protection method and system of small current grounding fault | |
| CN106207925A (en) | A kind of distribution network line ice melting system and de-icing method thereof | |
| CN109921391A (en) | A kind of starting method and system of the protection of direct current supply line based on jump-value of current | |
| CN109787196A (en) | Low-voltage direct distribution network protection control method and system | |
| CN104092200A (en) | Double-circuit-line non-same-name phase overline ground fault single-ended electrical quantity steady state protection method | |
| CN107276043A (en) | A kind of active distribution network protection scheme based on electric current positive-sequence component phase place change | |
| CN102904225B (en) | Pilot protection method for distribution network with distributed power supply | |
| CN101582581A (en) | Electricity leakage-prevention and overcurrent protection device | |
| CN104122489A (en) | Single-phase earth fault selection method of DC (Direct Current) transmission line |
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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191227 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |