CN109188188A - The single-ended method of discrimination of Multi-end flexible direct current transmission line fault based on voltage monitoring - Google Patents
The single-ended method of discrimination of Multi-end flexible direct current transmission line fault based on voltage monitoring Download PDFInfo
- Publication number
- CN109188188A CN109188188A CN201810748829.8A CN201810748829A CN109188188A CN 109188188 A CN109188188 A CN 109188188A CN 201810748829 A CN201810748829 A CN 201810748829A CN 109188188 A CN109188188 A CN 109188188A
- Authority
- CN
- China
- Prior art keywords
- voltage
- boundary
- measurement point
- transient state
- ratio
- 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.)
- Pending
Links
Classifications
-
- 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
-
- 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
- G01R31/088—Aspects of digital computing
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Locating Faults (AREA)
Abstract
The present invention relates to field of power system more particularly to a kind of single-ended method of discrimination of Multi-end flexible direct current transmission line fault based on voltage monitoring, comprising: the voltage of the voltage of acquisition boundary inductor wire trackside measurement point and boundary inductor commutation station side measurement point in real time；Obtain the transient state band component of the voltage of boundary inductor wire trackside measurement point and boundary inductor commutation station side measurement point respectively by bandpass filter；Calculate the ratio of the transient state band component of the transient state band component of the voltage of boundary inductor wire trackside measurement point and the voltage of boundary inductor commutation station side measurement point；If the ratio is greater than threshold value, the DC line where being determined as the boundary inductance breaks down；If the ratio is less than threshold value, the non-dc line failure being determined as where the boundary inductance.By using the present invention: realizing accurate, the reliable differentiation of multiterminal flexible direct current line fault position, and there is stronger anti-transition resistance ability and anti-interference ability.
Description
Technical field
The present invention relates to field of power system more particularly to a kind of Multi-end flexible direct current transmission routes based on voltage monitoring
The single-ended method of discrimination of failure.
Background technique
Flexible HVDC transmission system has the characteristics that separately adjustable active and reactive power, can power to passive network,
Compared with conventional high-tension DC transmission system, Multi-end flexible direct current transmission system has apparent advantage.However due to flexible straight
The architectural characteristic of transmission system is flowed, flexible DC transmission line fault electric current is big, and fault progression is rapid, and DC voltage falls
Fastly, being easy to, which causes whole system to lose, stablizes and stops transport.Therefore, fast and reliable ground Judging fault route, and promptly isolate event
Barrier is the critical issue that Multi-end flexible direct current transmission system development and construction face.
Fault distinguishing method used in direct current transmission line fault is detected in flexible direct current engineering at present and protection is main
The arrangements of conventional high-tension direct current system are used for reference, i.e., using traveling-wave protection and differential under-voltage protection as flexible DC transmission line
The main protection on road, it is such mainly to carry out therefore differentiate by the single-ended traveling wave monitored, but there are anti-transition resistance scarce capacities
The problem of.In addition, also configuring according to the fault distinguishing scheme of current differential and according to DC overvoltage protection and DC voltage
Unbalanced fault distinguishing scheme.DC line dual ended data, fault distinguishing are needed using the fault distinguishing scheme of current differential
Speed is unable to satisfy the requirement that flexible HVDC transmission system quickly isolates failure.Simultaneously as flexible direct current side is special in Low ESR
Sign is not high to faulty line selectivity according to DC overvoltage protection and the unbalanced fault distinguishing scheme of DC voltage.
After searching and discovering the prior art, Chinese patent literature CN106253240A discloses (bulletin) day
2016.12.21, a kind of multiterminal flexible direct current network system Non-unit protection method based on borderline properties, this method benefit are disclosed
With the voltage difference Judging fault direction on DC line boundary, electric current high-frequency energy Judging fault position is utilized.But due to using electricity
Flow high-frequency energy Judging fault, this method is influenced vulnerable to transition resistance, while being calculated using voltage and current amount, operation compared with
For complexity.In addition, also found that China document patent CN107681641A discloses (bulletin) day 2018.02.09 through retrieval, disclose
A kind of multiterminal flexible direct current power grid boundary protection method based on direct current reactor voltage, this method rely on direct current reactor both ends
Voltage change feature decision DC line fault, since multiterminal flexible direct current system is chiefly used in new-energy grid-connected field, direct current
When line power fluctuation is larger, the accuracy of this method Judging fault will be affected.
Summary of the invention
To solve the above problems, the present invention proposes a kind of Multi-end flexible direct current transmission line fault list based on voltage monitoring
Method of discrimination is held, by calculating the frequency band transient voltage at DC line boundary inductance both ends than sentencing for failure position can be realized
Not.
The single-ended method of discrimination of Multi-end flexible direct current transmission line fault based on voltage monitoring, comprising the following steps: with straight
The divider for flowing the boundary inductance two sides of transmission line of electricity unilateral side is measurement point, acquires the electricity of boundary inductor wire trackside measurement point in real time
The voltage of pressure and boundary inductor commutation station side measurement point；Obtained respectively by bandpass filter boundary inductor wire trackside measurement point and
The transient state band component of the voltage of boundary inductor commutation station side measurement point；Calculate the temporary of the voltage of boundary inductor wire trackside measurement point
The ratio of the transient state band component of state band component and the voltage of boundary inductor commutation station side measurement point；If the ratio is greater than threshold
Value, the then DC line where being determined as the boundary inductance break down；If the ratio is less than threshold value, it is determined as the boundary
Non-dc line failure where inductance.
Preferably, the transient state band component and boundary inductor commutation of the voltage for calculating boundary inductor wire trackside measurement point
The ratio of the transient state band component of the voltage for side measurement point of standing are as follows:
Wherein, KmnkIndicate transient voltage ratio, VTLmnkIt (i) is by the voltage V of boundary inductor wire trackside measurement pointLmnkIn mention
The transient state frequency band voltage taken, VTCmnkIt (i) is by the voltage V of boundary inductor commutation station side measurement pointCmnkThe transient state frequency band electricity of middle extraction
Pressure；NwCalculate the number of transient state frequency band voltage in time window, Nw=Fs*Tw；FsFor sample frequency, TwTo calculate time window.
Preferably, the voltage of boundary inductor wire trackside measurement point is temporary when the threshold value is less than generation DC line fault
The minimum value of the ratio of the transient state band component of state band component and the voltage of boundary inductor commutation station side measurement point, and it is greater than hair
The transient state band component of the voltage of boundary inductor wire trackside measurement point and boundary inductor commutation station side when raw non-dc line fault
The maximum value of the ratio of the transient state band component of the voltage of measurement point.
By using the present invention, following effect may be implemented:
1. realizing accurate, the reliable differentiation of multiterminal flexible direct current line fault position, and there is stronger anti-transition resistance
Ability and anti-interference ability；
2. due to DC line boundary inductance to fault transient amount component have good retardation so that this route with
Independent characteristic is presented in adjacent lines on transient state magnitude relation, therefore the setting of threshold value is hardly by the shadow of system topology
It rings.
Detailed description of the invention
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is the flow diagram of the embodiment of the present invention；
Fig. 2 is the circuit connection diagram of flexible HVDC transmission system in the embodiment of the present invention；
Fig. 3 is that transient voltage ratio K when metallicity failure occurs for different location in the embodiment of the present invention54PAnalogous diagram；
Fig. 4 is that transient voltage ratio when transition resistance ground fault occurs for DC line Cable 45 in the embodiment of the present invention
K54PAnalogous diagram；
Fig. 5 is each converter station power swing analogous diagram in the embodiment of the present invention；
Fig. 6 is the analogous diagram of 13 both ends transient voltage ratio of DC line Cable in the embodiment of the present invention under power swing.
Specific embodiment
Below in conjunction with attached drawing, technical scheme of the present invention will be further described, but the present invention is not limited to these realities
Apply example.
The basic idea of the invention is that the inductance of flexible direct current route and DC side parallel capacitor constitute the side of DC line
High impedance characteristic is presented to the transient state band component of voltage in boundary；Due to the low harmony wave source characteristic of inverter, boundary inductance is changed
The transient voltage for flowing device side has certain low amplitude value.Therefore, when DC line fault occurs, the transient state band component of voltage
It is very big with the ratio of the transient state band component of the voltage of boundary inductor commutation station side divider, and the feelings of significantly greater than external area error
Shape uses differentiation of the single-ended transient voltage than achieving that DC line fault position.
In conjunction with attached drawing 1, a kind of Multi-end flexible direct current transmission line fault list based on voltage monitoring is present embodiments provided
Hold method of discrimination, comprising the following steps:
Step 1 acquires boundary using the divider of the boundary inductance two sides of DC power transmission line unilateral side as measurement point in real time
The voltage of inductor wire trackside measurement point and the voltage of boundary inductor commutation station side measurement point；
Step 2, boundary inductor wire trackside measurement point is obtained by bandpass filter respectively and boundary inductor commutation station side is surveyed
Measure the transient state band component of the voltage of point；
Step 3 calculates transient state band component and the boundary inductor commutation station side of the voltage of boundary inductor wire trackside measurement point
The ratio of the transient state band component of the voltage of measurement point；
Step 4, if the ratio is greater than threshold value, the DC line where being determined as the boundary inductance breaks down；If
The ratio is less than threshold value, then the non-dc line failure being determined as where the boundary inductance.
Wherein, the voltage of boundary inductor wire trackside measurement point refers to: the monitoring of DC line boundary inductor wire trackside divider
The full range of acquisition is with voltage to use VLmnkIt indicates, subscript m, n indicates DC line terminal number, and k=P, N respectively indicate AC line
Road positive and negative electrode.
Wherein, the voltage of boundary inductor commutation station side measurement point refers to: DC line boundary inductor wire trackside divider prison
The full range that survey obtains is with voltage to use VCmnkIt indicates.
Wherein, the transient state band component of voltage refers to: point of voltage in the high-frequency range obtained by bandpass filter
Amount, frequency range are determined by line boundary inductance and DC bus capacitor.
Wherein, transient voltage ratio refers to: the transient state band component of the voltage of boundary inductor wire trackside measurement point and boundary electricity
Feel the ratio between the transient state band component of voltage of converter station side measurement point, it may be assumed that
Wherein, KmnkIndicate transient voltage ratio, VTLmnkIt (i) is by the voltage V of boundary inductor wire trackside measurement pointLmnkIn mention
The transient state frequency band voltage taken, VTCmnkIt (i) is by the voltage V of boundary inductor commutation station side measurement pointCmnkThe transient state frequency band electricity of middle extraction
Pressure；NwCalculate the number of transient state frequency band voltage in time window, Nw=Fs*Tw；FsFor sample frequency, TwTo calculate time window.
When DC line fault, the transient state band component for the voltage that DC line fault generates is not by the barrier on boundary
Effect directly reaches at divider, therefore the transient state frequency band voltage V of boundary inductor wire trackside measurement pointTLmnkIt is larger.Non-straight streamline
Road failure includes positive external area error and reverse fault.When positive external area error, the transient state band component of voltage passes through route pair
The boundary inductance and shunt capacitance at end reach at divider, and extremely low impedance operator is presented to transient state band component for shunt capacitance,
And higher impedance characteristic, therefore, boundary inductor wire trackside measurement point is presented to the transient state band component of voltage in boundary inductance
Transient state frequency band voltage VTLmnkBoundary inductor wire trackside measurement point transient state frequency band voltage V when by than DC line faultTLmnkWidth
It is worth much smaller.It means that transient voltage ratio K when positive external area errormnkIt is temporary when by less than forward dc line fault
State voltage ratio, but due to being all positive failure, transient state band component has the inductive circuit effluent on boundary to reach again through boundary inductance
Boundary inductor commutation station side, therefore the transient state frequency band voltage V of boundary inductor wire trackside measurement pointTLmnkIt will be greater than boundary inductor commutation
Stand side measurement point transient state frequency band voltage VTCmnk, thus the transient voltage ratio K being calculatedmnkIt will be greater than 1.When reverse fault, transient state
The direction of band component flows to DC line, i.e. the transient state frequency band voltage V of boundary inductor commutation station side by DC busTCmnkIt will be high
In the transient state frequency band voltage V of boundary inductor wire tracksideTLmnk.Therefore, when reverse fault, transient voltage ratio will be less than 1.To sum up may be used
: if transient voltage ratio is greater than DC line fault threshold value, event occurs for the DC line where being determined as the boundary inductance
Barrier；If the ratio is less than non-dc line fault threshold value, event occurs for the non-straight Flow Line where being determined as the boundary inductance
Barrier.Wherein, the setting of threshold value needs to consider the minimum value and non-dc line fault of transient voltage ratio when DC line fault
When transient voltage ratio maximum value, that is, be less than DC line fault when transient voltage ratio minimum value, and be greater than non-straight Flow Line
When failure when non-dc line fault transient voltage ratio maximum value.
Since DC line boundary inductance has good retardation to fault transient amount component, so that this route and phase
Independent characteristic is presented in adjacent line road on transient state magnitude relation, therefore the setting of threshold value is hardly by the shadow of system topology
It rings, facilitates adjusting.
It is illustrated in figure 2 the circuit connection diagram of flexible HVDC transmission system.In Fig. 2, DC side voltage rating be ±
160kV, VSC1 ..., VSC5 respectively indicate five flexible direct current converter stations, and VSC1, VSC2 are separately connected wind power plant 1, wind power plant 2
Output end, VSC3, VSC4, VSC5 are separately connected the output end of AC network 3, AC network 4, AC network 5.Cable
13, Cable 24, Cable 45 indicates that direct current cables, Line 34 indicate direct current overhead transmission line；VL13、VL31、VL34、VL43、VL24、
VL42、VL45、VL54Respectively indicate the voltage of boundary inductor wire trackside divider monitoring, VC13、VC31、VC34、VC43、VC24、VC42、
VC45、VC54Respectively indicate the voltage of boundary inductor commutation device side divider monitoring；Dotted box portion be AC network 4, VSC4 with
And the enlarged drawing of Cable 45.Wherein: 13 24 rated current 0.45kA, Line 34 of rated current 0.6kA, Cable of Cable
45 rated current of rated current 0.25kA, Cable, 13 24 length 70km of length 100km, Cable of 0.35kA, Cable,
34 45 length 100km of length 200km, Cable of Line.A, B, C, D, E, F G H respectively indicate position of failure point, A, B
In on DC line, C, G, H are located at alternating current net side, and D, E, F are located inside converter station.In addition to failure at A, B, remaining failure is equal
Belong to non-dc line fault.Fault distinguishing method provided by the invention can accurately differentiate DC line fault position zone, i.e.,
Differentiate part of path locating for failure at A, B, and distinguish over C, D, E, failure at F G H, while judging its fault direction.
In the present embodiment, simulating, verifying is carried out to the method for the invention based on system shown in Figure 2, concrete outcome is as schemed
3, shown in Fig. 4, Fig. 5, Fig. 6.Fig. 3 indicates transient voltage ratio K when metallicity failure occurs for different location54PAnalogous diagram, abscissa
Indicate the distance of fault distance converter station VSC5, ordinate indicates transient voltage ratio K54P；Fig. 4 indicates DC line Cable 45
Transient voltage ratio K when transition resistance ground fault occurs54PAnalogous diagram, abscissa indicate fault distance converter station VSC5 away from
From ordinate indicates the transient voltage ratio K of different DC line ground resistances54P；Fig. 5 indicates that each converter station power swing is imitative
True figure, P1-P5 respectively indicate the active power of converter station VSC1-VSC5；Fig. 6 indicates the transient voltage calculated under power swing
The analogous diagram of ratio.
Fig. 3 shows transient voltage ratio K when DC line fault54PThe significantly greater than numerical value of non-dc line fault, should
Method can reliably distinguish 45 failure of DC line Cable.Fig. 4 shows even if when DC line ground resistance is up to 300
This feature is still met when Ω, which has stronger anti-transition resistance ability.Although Fig. 5, Fig. 6 show
The active power fluctuation of DC line Cable 13 is obvious, but the transient voltage that the both ends of DC line Cable 13 calculate is than bright
It is aobvious to be in smaller value, it is determined as non-straight Flow Line Cable13 failure.
Those skilled in the art can make various modifications to described specific embodiment
Or supplement or be substituted in a similar manner, however, it does not deviate from the spirit of the invention or surmounts the appended claims determines
The range of justice.
Claims (3)
1. the single-ended method of discrimination of Multi-end flexible direct current transmission line fault based on voltage monitoring, which is characterized in that including following
Step:
Using the divider of the boundary inductance two sides of DC power transmission line unilateral side as measurement point, boundary inductor wire trackside is acquired in real time and is surveyed
Measure the voltage of point and the voltage of boundary inductor commutation station side measurement point；
Obtain the voltage of boundary inductor wire trackside measurement point and boundary inductor commutation station side measurement point respectively by bandpass filter
Transient state band component；
Calculate the transient state band component of the voltage of boundary inductor wire trackside measurement point and the electricity of boundary inductor commutation station side measurement point
The ratio of the transient state band component of pressure；
If the ratio is greater than threshold value, the DC line where being determined as the boundary inductance breaks down；If the ratio is less than
Threshold value, then the non-dc line failure being determined as where the boundary inductance.
2. the Multi-end flexible direct current transmission line fault single-ended method of discrimination according to claim 1 based on voltage monitoring,
It is characterized in that, transient state band component and the boundary inductor commutation station side of the voltage for calculating boundary inductor wire trackside measurement point
The ratio of the transient state band component of the voltage of measurement point are as follows:
Wherein, KmnkIndicate transient voltage ratio, VTLmnkIt (i) is by the voltage V of boundary inductor wire trackside measurement pointLmnkMiddle extraction
Transient state frequency band voltage, VTCmnkIt (i) is by the voltage V of boundary inductor commutation station side measurement pointCmnkThe transient state frequency band voltage of middle extraction；Nw
Calculate the number of transient state frequency band voltage in time window, Nw=Fs*Tw；FsFor sample frequency, TwTo calculate time window.
3. the Multi-end flexible direct current transmission line fault single-ended method of discrimination according to claim 1 based on voltage monitoring,
It is characterized in that, the threshold value is less than the transient state frequency of the voltage of boundary inductor wire trackside measurement point when DC line fault occurs
Minimum value with component Yu the ratio of the transient state band component of the voltage of boundary inductor commutation station side measurement point, and it is non-to be greater than generation
The transient state band component of the voltage of boundary inductor wire trackside measurement point and boundary inductor commutation station side measure when DC line fault
The maximum value of the ratio of the transient state band component of the voltage of point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810748829.8A CN109188188A (en) | 2018-07-10 | 2018-07-10 | The single-ended method of discrimination of Multi-end flexible direct current transmission line fault based on voltage monitoring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810748829.8A CN109188188A (en) | 2018-07-10 | 2018-07-10 | The single-ended method of discrimination of Multi-end flexible direct current transmission line fault based on voltage monitoring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109188188A true CN109188188A (en) | 2019-01-11 |
Family
ID=64936340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810748829.8A Pending CN109188188A (en) | 2018-07-10 | 2018-07-10 | The single-ended method of discrimination of Multi-end flexible direct current transmission line fault based on voltage monitoring |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109188188A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110429572A (en) * | 2019-08-20 | 2019-11-08 | 国网陕西省电力公司电力科学研究院 | A kind of DC distribution net interpolar failure fast protection method |
| CN111313386A (en) * | 2020-03-26 | 2020-06-19 | 华南理工大学 | Multi-terminal hybrid high-voltage direct-current line transient protection method and system |
| CN113595040A (en) * | 2021-07-06 | 2021-11-02 | 天津大学 | Annular direct-current micro-grid single-ended current type distance measurement method based on control and protection cooperation |
| CN114062838A (en) * | 2021-10-29 | 2022-02-18 | 深圳供电局有限公司 | Direct-current wiring fault positioning method and device and medium-voltage direct-current power distribution equipment |
| CN114154293A (en) * | 2021-10-20 | 2022-03-08 | 广东电网有限责任公司阳江供电局 | Direct-drive wind power plant equivalent modeling method and device based on real-time data |
| CN116699317A (en) * | 2023-07-11 | 2023-09-05 | 西南交通大学 | Interelectrode short-circuit fault positioning method for multi-terminal annular flexible direct-current power distribution network |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101777759A (en) * | 2010-03-23 | 2010-07-14 | 西安交通大学 | Complete set of protection devices for ultrahigh-speed DC line on basis of single-ended transient signals and protection method thereof |
| CN102005739A (en) * | 2010-08-27 | 2011-04-06 | 昆明理工大学 | Method for identifying extra-high voltage direct current transmission line area inside and outside fault wavelet energy |
| CN102654552A (en) * | 2012-04-16 | 2012-09-05 | 昆明理工大学 | Method for protecting transient voltages at two terminals of super-high voltage direct current transmission line |
| CN103777114A (en) * | 2014-01-26 | 2014-05-07 | 浙江大学 | Method for recognizing single-phase permanent fault of single-ended electric transmission line with paralleling reactor |
-
2018
- 2018-07-10 CN CN201810748829.8A patent/CN109188188A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101777759A (en) * | 2010-03-23 | 2010-07-14 | 西安交通大学 | Complete set of protection devices for ultrahigh-speed DC line on basis of single-ended transient signals and protection method thereof |
| CN102005739A (en) * | 2010-08-27 | 2011-04-06 | 昆明理工大学 | Method for identifying extra-high voltage direct current transmission line area inside and outside fault wavelet energy |
| CN102654552A (en) * | 2012-04-16 | 2012-09-05 | 昆明理工大学 | Method for protecting transient voltages at two terminals of super-high voltage direct current transmission line |
| CN103777114A (en) * | 2014-01-26 | 2014-05-07 | 浙江大学 | Method for recognizing single-phase permanent fault of single-ended electric transmission line with paralleling reactor |
Non-Patent Citations (1)
| Title |
|---|
| JIAN LIU ET AL.: "Transient-Voltage-Based Protection Scheme for DC Line Faults in the Multiterminal VSC-HVDC System", 《IEEE TRANSAC TIONS ON POWER DELIVERY》 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110429572A (en) * | 2019-08-20 | 2019-11-08 | 国网陕西省电力公司电力科学研究院 | A kind of DC distribution net interpolar failure fast protection method |
| CN110429572B (en) * | 2019-08-20 | 2021-03-16 | 国网陕西省电力公司电力科学研究院 | Rapid protection method for interelectrode fault of direct-current power distribution network |
| CN111313386A (en) * | 2020-03-26 | 2020-06-19 | 华南理工大学 | Multi-terminal hybrid high-voltage direct-current line transient protection method and system |
| CN111313386B (en) * | 2020-03-26 | 2021-01-19 | 华南理工大学 | Multi-terminal hybrid high-voltage direct-current line transient protection method and system |
| CN113595040A (en) * | 2021-07-06 | 2021-11-02 | 天津大学 | Annular direct-current micro-grid single-ended current type distance measurement method based on control and protection cooperation |
| CN114154293A (en) * | 2021-10-20 | 2022-03-08 | 广东电网有限责任公司阳江供电局 | Direct-drive wind power plant equivalent modeling method and device based on real-time data |
| CN114062838A (en) * | 2021-10-29 | 2022-02-18 | 深圳供电局有限公司 | Direct-current wiring fault positioning method and device and medium-voltage direct-current power distribution equipment |
| CN116699317A (en) * | 2023-07-11 | 2023-09-05 | 西南交通大学 | Interelectrode short-circuit fault positioning method for multi-terminal annular flexible direct-current power distribution network |
| CN116699317B (en) * | 2023-07-11 | 2024-02-20 | 西南交通大学 | Interelectrode short-circuit fault positioning method for multi-terminal annular flexible direct-current power distribution network |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109188188A (en) | The single-ended method of discrimination of Multi-end flexible direct current transmission line fault based on voltage monitoring | |
| CN107979075B (en) | A kind of multiterminal flexible direct current power grid DC line Non-unit protection method | |
| CN105098738B (en) | A kind of HVDC transmission line longitudinal protection method based on S-transformation | |
| CN109888744B (en) | Protection method for high-voltage direct-current transmission line | |
| CN105891676B (en) | The flexible high pressure DC line protection method of current dependence | |
| CN109217267B (en) | Multiterminal flexible direct current power grid longitudinal protection method and system based on current-limiting inductance polarity of voltage | |
| Gao et al. | A novel whole-line quick-action protection principle for HVDC transmission lines using one-end voltage | |
| CN108599114B (en) | A kind of high voltage ac/dc combined hybrid system alternating current circuit transient state direction protection method | |
| CN109274079B (en) | Single-end protection method for annular flexible direct-current power grid line | |
| CN106154116A (en) | A kind of distribution net work earthing fault localization method | |
| WO2014121438A1 (en) | Method and apparatus for current differential protection for uhvdc transmission line | |
| CN109061397B (en) | Line fault area identification method | |
| CN106463950B (en) | DC grid guard method and its system | |
| CN111711175A (en) | Flexible direct-current distribution line protection method based on transient current waveform similarity recognition | |
| Chu et al. | Analytical method of fault characteristic and non-unit protection for HVDC transmission lines | |
| CN109066614A (en) | A kind of half-wave power transmission line protection method based on transient state energy | |
| CN110907753B (en) | HHT energy entropy based MMC-HVDC system single-ended fault identification method | |
| CN105652156A (en) | Ultra-high voltage alternating current transmission circuit single-phase grounding voltage phase sudden change distance measurement method | |
| CN103592569B (en) | A kind of extra-high-voltage direct-current transmission line fault location based on high frequency content attenuation characteristic | |
| CN111398851A (en) | MMC-HVDC direct current transmission line fault detection method | |
| CN110244181A (en) | Marine wind electric field collection electric line sea cable electric fault localization method and its device | |
| CN113300343A (en) | Flexible direct current power grid fault line identification method based on cosine similarity | |
| CN108599116B (en) | Direct-current line protection method suitable for alternating-current and direct-current hybrid power distribution network | |
| CN108808634A (en) | HVDC transmission line longitudinal protection method based on smoothing reactor voltage | |
| CN115425623A (en) | Transient current ratio-based multi-terminal flexible direct-current transmission line pilot protection method |
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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190111 |
|
| RJ01 | Rejection of invention patent application after publication |