CN110470952A - The fault detection method of DC distribution net - Google Patents
The fault detection method of DC distribution net Download PDFInfo
- Publication number
- CN110470952A CN110470952A CN201910762603.8A CN201910762603A CN110470952A CN 110470952 A CN110470952 A CN 110470952A CN 201910762603 A CN201910762603 A CN 201910762603A CN 110470952 A CN110470952 A CN 110470952A
- Authority
- CN
- China
- Prior art keywords
- mould
- mode voltage
- point
- voltage
- sampled point
- 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
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
-
- 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
-
- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Locating Faults (AREA)
Abstract
The invention discloses a kind of fault detection methods of DC distribution net, method is the following steps are included: the anode of the rectification side M and inverter side N of acquisition DC distribution net and the voltage and current of cathode, mode voltage and mould electric current are sought based on the voltage and current, the derivative of mode voltage is sought based on the mode voltage, the mould equivalent capacitance value of derivative identification two sides based on the mode voltage, determine sampled point when capacitor starts to stablize, first point that the mould identification capacitance for taking continuous multiple spot to calculate meets stable region is that capacitor starts stable sampled point, determine two sides traveling wave arrival time, wherein, m-th of the side M sampled point is that capacitor starts stable point, at the time of correspondence at the time of then the side M wavefront reaches for m sampled point, n-th of the side N sampled point is that capacitor starts stable point, it is sampled at the time of the side N wavefront reaches for n At the time of point is corresponding, it is based on the two sides traveling wave arrival time positioning failure distance.
Description
Technical field
The invention belongs to DC distribution network technology field, especially a kind of fault detection method of DC distribution net.
Background technique
Electric power system power source and load are changing, with the raising of new energy permeability, power electronic technique
The rapid growth of development and DC load, so that the power grid of joining power and load develops towards direct current direction.It is flexible
Direct current transmission and distribution technology turns off switch element and modulation technique based on novel, can be to active and idle decoupling control, tool
Have without reactive compensation, do not have commutation failure problem, harmonics level it is low, can for passive system power supply, be suitable for realizing it is asynchronous
Many advantages, such as net and composition multi-terminal direct current transmission system, while also power supply, island power supply, the friendship in new-energy grid-connected, city
There is very high application prospect in the fields such as direct current mixing transmission of electricity.It is supplied in view of concentrating access on a large scale in generation of electricity by new energy, reducing
Electric corridor reduces transmission losses, improves the outstanding advantage that power supply quality and power supply reliability etc. have, flexible direct current power grid
It is considered as the great revolutionary technology of power system development.
VSC distribution system-flexible direct current the power distribution network for being applied to mesolow voltage class is become and studies new hot spot, China
Flexible direct current distribution electricity demonstration project has had been established in Shenzhen area, but relay protection and event for flexible direct current power distribution network
Barrier positioning is abundant not enough.
Disclosed above- mentioned information are used only for enhancing the understanding to background of the present invention in the background section, it is thus possible to
Information comprising not constituting the prior art known to a person of ordinary skill in the art in home.
Summary of the invention
Aiming at the problems existing in the prior art, the present invention proposes a kind of fault detection method of DC distribution net, logical
It crosses on the basis of zero mould equivalent network of analysis flexible direct current power distribution network, using Bei Ruilong circuit model, proposes DC distribution net
The detection of traveling wave both-end positioning failure, this method can effectively improve the accuracy of wavefront, do not influenced by transition resistance,
To improve the precision of fault localization.
The purpose of the present invention is being achieved by the following technical programs, a kind of fault detection method packet of DC distribution net
Include following steps:
In first step, the anode of the rectification side M and inverter side N of DC distribution net and the voltage and current of cathode are acquired,
Mode voltage and mould electric current are sought based on the voltage and current, wherein
sp、snRespectively indicate the voltage or current of anode and cathode, s1With
s0Respectively indicate 1 mould and 0 mode voltage or electric current；
In second step, the derivative of mode voltage is sought based on the mode voltage, wherein
Wherein, u0It is zero mode voltage, Δ t is sampling step
Long, t is time, t=tsT is sought in expressionsThe zero mode voltage derivative at moment；
In third step, the mould equivalent capacitance value of the derivative identification two sides based on the mode voltage, wherein
C is the mould equivalent capacitance value of identification, i0It is zero mould electric current；
In four steps, sampled point when capacitor starts to stablize is determined, the mould identification capacitance for taking continuous multiple spot to calculate is full
First point of sufficient stable region is that capacitor starts stable sampled point, wherein
I is sampling number, Δ C0For mould capacitance error；
In 5th step, two sides traveling wave arrival time is determined, wherein m-th of the side M sampled point starts stable for capacitor
Point, then t at the time of correspondence at the time of the side M wavefront reaches for m sampled pointM, n-th of the side N sampled point is that capacitor starts to stablize
Point, the side N wavefront reach at the time of for n sampled point correspond at the time of tN；
In 6th step, it is based on the two sides traveling wave arrival time positioning failure distance, wherein xM=[L-v0(tN-
tM)]/2, xMFor fault point to the distance of the side M, v0For the wave velocity of mode voltage and electric current, L is line length.
In the method, in first step, DC distribution net is flexible direct current power distribution network, and rectification side and inverter side are simultaneously
Join capacitor.
In the method, in third step, the mould equivalent capacitance value of the two sides is equal to the value of the shunt capacitance.
In the method, it is based on the auspicious zero mould equivalent network of carina road model modeling flexible direct current power distribution network of shellfish, is acquired soft
Property zero mould equivalent network of DC distribution net rectification side M and inverter side N anode and cathode voltage and current.
In the method, in four steps, the moulds identification capacitances of continuous 3 points of calculating is taken to meet the of stable region
One point is that capacitor starts stable sampled point.
In the method, in four steps, mould capacitance error Δ C0It is the 20% of mould equivalent capacitance value C.
In the method, in second step, mode voltage is sought by using three point value differential based on the mode voltage
Derivative.
Compared to the prior art, the invention has the following advantages that
This invention simplifies detection of complex, significantly improve precision, when monopolar grounding fault occurs for different location, this
The both-end positioning failure relative error of the mold component of the traveling wave voltage of invention and travelling wave current identification equivalent capacity less than 0.9%,
Have the advantages that be obviously improved detection accuracy not by transition Resistance Influence.
Detailed description of the invention
By reading the detailed description in hereafter preferred embodiment, various other advantages and benefits of the present invention
It will become apparent to those of ordinary skill in the art.Figure of description only for the purpose of illustrating preferred embodiments,
And it is not to be construed as limiting the invention.It should be evident that drawings discussed below is only some embodiments of the present invention,
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings
Other attached drawings.And throughout the drawings, identical component is presented with like reference characters.
In the accompanying drawings:
Fig. 1 is the step schematic diagram of the fault detection method of DC distribution net according to an embodiment of the invention；
Fig. 2 is the both-end flexible direct current system of the fault detection method of DC distribution net according to an embodiment of the invention
Schematic diagram；
Fig. 3 is showing for zero mould equivalent network of the fault detection method of DC distribution net according to an embodiment of the invention
It is intended to；
Fig. 4 (a), Fig. 4 (b) are the fault detection methods of DC distribution net according to an embodiment of the invention away from the side M
Zero mode voltage of cathode metal ground fault and the schematic diagram of zero mould current waveform occur at 20km；
Fig. 5 (a), Fig. 5 (b) are the fault detection methods of DC distribution net according to an embodiment of the invention away from the side M
The schematic diagram of the zero mould identification capacitor waveform of cathode metal ground fault occurs at 20km.
Below in conjunction with drawings and examples, the present invention will be further explained.
Specific embodiment
The specific embodiment that the present invention will be described in more detail below with reference to accompanying drawings.Although being shown in attached drawing of the invention
Specific embodiment, it being understood, however, that may be realized in various forms the present invention without that should be limited by embodiments set forth here
System.It is to be able to thoroughly understand the present invention on the contrary, providing these embodiments, and can be complete by the scope of the present invention
Be communicated to those skilled in the art.
It should be noted that having used some vocabulary in the specification and claims to censure specific components.Ability
Field technique personnel it would be appreciated that, technical staff may call the same component with different nouns.This specification and right
It is required that not in such a way that the difference of noun is as component is distinguished, but with the difference of component functionally as differentiation
Criterion."comprising" or " comprising " as mentioned throughout the specification and claims are an open language, therefore should be solved
It is interpreted into " including but not limited to ".Specification subsequent descriptions are to implement better embodiment of the invention, so the description be with
For the purpose of the rule of specification, the range that is not intended to limit the invention.Protection scope of the present invention is when the appended right of view
It is required that subject to institute's defender.
In order to facilitate understanding of embodiments of the present invention, further by taking specific embodiment as an example below in conjunction with attached drawing to be solved
Explanation is released, and each attached drawing does not constitute the restriction to the embodiment of the present invention.
In order to better understand, Fig. 1 is the step schematic diagram of method according to an embodiment of the invention, as shown in Figure 1,
The fault detection method of DC distribution net the following steps are included:
In first step S1, the anode of the rectification side M and inverter side N of DC distribution net and the voltage and electricity of cathode are acquired
Stream, seeks mode voltage and mould electric current based on the voltage and current, wherein
sp、snRespectively indicate the voltage or current of anode and cathode, s1And s0
Respectively indicate 1 mould and 0 mode voltage or electric current；
In second step S2, the derivative of mode voltage is sought based on the mode voltage, wherein
Wherein, u0It is zero mode voltage, Δ t is sampling step length, and t is
Time, t=tsT is sought in expressionsThe zero mode voltage derivative at moment；
In third step S3, the mould equivalent capacitance value of the derivative identification two sides based on the mode voltage, whereinC is the mould equivalent capacitance value of identification, i0It is zero mould electric current；
In four steps S4, sampled point when capacitor starts to stablize is determined, the mould identification capacitance for taking continuous multiple spot to calculate
First point for meeting stable region is that capacitor starts stable sampled point, wherein
C is the mould equivalent capacitance value of identification, and i is sampling number, Δ C0For mould capacitance error；
In 5th step S5, two sides traveling wave arrival time is determined, wherein m-th of the side M sampled point starts stable for capacitor
Point, then t at the time of correspondence at the time of the side M wavefront reaches for m sampled pointM, n-th of the side N sampled point is that capacitor starts to stablize
Point, the side N wavefront reach at the time of for n sampled point correspond at the time of tN；
In 6th step S6, it is based on the two sides traveling wave arrival time positioning failure distance, wherein xM=[L-v0(tN-
tM)]/2, xMFor fault point to the distance of the side M, v0For the wave velocity of mode voltage and electric current, L is line length.
It is simple in order to analyze for a further understanding of the present invention, it is simple in order to analyze, with both-end flexible direct current system point
Analysis, it is specific as shown in Figure 2.For flexible direct current system, two sides are parallel with capacitor, and lay wire network is as shown in figure 3, specific mark
Show by taking zero lay wire network as an example, in figure, uM0, iM0And uN0, iN0Respectively zero mode voltage and electric current of rectification side and inverter side；CMWith
CNThe respectively shunt capacitance of two sides.Fault point UfFor zero equivalent mode voltage source.Route is equivalent using π model, CLIt is equivalent
Direct-to-ground capacitance, RM、LMAnd RN、LNThe respectively equivalent resistance of fault point two sides route and reactance.
In lay wire network shown in Fig. 3, for the capacitor of two sides, by voltage, the available following relationship of current relationship
Formula:
I.e. in generating region when monopolar grounding fault, both ends can accurately be calculated by the mode voltage and mould electric current at route both ends
Bulky capacitor in parallel capacitance.
After monopolar grounding fault occurs, traveling wave is propagated from fault point to route both ends.Before traveling wave reaches route both ends,
The mould current value and mode voltage value at route both ends are zero, and lay wire network shown in Fig. 3 is not present.Only when traveling wave reaches route two
When end, lay wire network just exists, and is equal to parallel capacitance of value by the capacitance that formula (1) calculates.So monopolar grounding fault is sent out in area
After life, due to the delay that traveling wave is propagated, identification capacitance can be mutated by certain delay to parallel capacitance of value.It therefore, can be with
The identification that wavefront arrival time is carried out according to the mutation moment of identification capacitance, at the time of recognizing the arrival of two sides wave head
After can calculate fault distance.For ground fault bipolar in area, lay wire network is identical as monopolar grounding fault, therefore
Wave head identification can also be carried out using this method.
Using capacitor identify improve DC distribution net Travelling Wave Fault Location precision method the specific implementation steps are as follows:
Step 1, acquires the voltage and current of two sides anode and cathode, and seeks mode voltage and mould electric current according to formula 2.
Wherein sp、snRespectively indicate the voltage or current of anode and cathode, s1And s0Respectively indicate 1 mould and 0 mode voltage or
Person's electric current.
Step 2: the derivative of mode voltage is sought by using three point value differential formulas 3；
Step 3: two side form equivalent capacitance values are identified by formula 1.
Step 4: determine that capacitor starts stable sampled point.Specific method is the bulky capacitor for assuming the parallel connection of VSC system both ends
Capacitance it is identical, be C0.To guarantee reliability, the mould identification capacitance of continuous 3 points of calculating is taken to meet the first of stable region
A point is that capacitor starts stable sampled point, specific as shown in Equation 4.
Wherein, C is the mould capacitor of identification, and i is sampling number, Δ C0For mould capacitance error, 20% equivalent electricity can be taken as
Hold C0。
Step 5 determines traveling wave arrival time.For two sides, capacitor start stable point be exactly wavefront reach when
It carves, it is assumed that m-th of the side M sampled point is that capacitor starts stable point, and n-th of the side N sampled point is that capacitor starts stable point, then M
At the time of correspondence at the time of side wavefront reaches for m sampled point, it is set as tM, it is n sampled point at the time of the side N wavefront reaches
At the time of corresponding, it is set as tN。
Step 6 calculates fault distance by formula 5 after identification obtains out two sides traveling wave arrival time.
xM=[L-v0(tN-tM)]/2 5
Wherein v0For the wave velocity of mode voltage and electric current, L is line length, xMFor fault point to the distance at the end M.
For a further understanding of technical effect of the invention, simulating, verifying is carried out, simulation model shown in Fig. 3 is based on, gives
Have away from the 20km of the end M when failure zero mode voltage of the side M and zero mould current waveform and the equivalent capacitance value identified, such as Fig. 4
(a), Fig. 4 (b) and Fig. 5 (a), Fig. 5 (b) are shown.
Change different fault distance and transition resistance, simulation result is as shown in table 1.
Distance measurement result in the case of 1 different faults distance of table and transition resistance
Data in analytical table 1 utilize traveling wave voltage and row it is found that when monopolar grounding fault occurs for different location in area
The both-end localization method relative error of the mold component identification equivalent capacity of wave electric current has less than 0.9% not by transition resistance shadow
Loud advantage.
In the preferred embodiment of the method, in first step S1, DC distribution net is flexible direct current power distribution network,
Rectification side and inverter side shunt capacitance.
In the preferred embodiment of the method, in third step S3, the mould equivalent capacitance value of the two sides is equal to institute
State the value of shunt capacitance.
In the preferred embodiment of the method, based on auspicious zero mould of carina road model modeling flexible direct current power distribution network of shellfish etc.
Network is imitated, the anode of the rectification side M and inverter side N of zero mould equivalent network of flexible direct current power distribution network and the voltage and electricity of cathode are acquired
Stream.
In the preferred embodiment of the method, in four steps S4, the mould identification capacitance of continuous 3 points of calculating is taken
First point for meeting stable region is that capacitor starts stable sampled point.
In the preferred embodiment of the method, in four steps S4, mould capacitance error Δ C0For mould equivalent capacitance value C
20%.
In the preferred embodiment of the method, in second step S2, based on the mode voltage by using three points
Value differential seeks the derivative of mode voltage.
The method that the present invention improves DC distribution net Travelling Wave Fault Location precision using capacitor identification is flexible straight by analysis
On the basis of flowing zero mould equivalent network of power distribution network, Bei Ruilong circuit model, the traveling wave both-end detection and localization of DC distribution net are utilized
Method can effectively improve the accuracy of wavefront, not influenced by transition resistance, to improve the precision of fault localization.
Although embodiment of the present invention is described in conjunction with attached drawing above, the invention is not limited to above-mentioned
Specific embodiments and applications field, above-mentioned specific embodiment are only schematical, directiveness, rather than restricted
's.Those skilled in the art are under the enlightenment of this specification and in the range for not departing from the claims in the present invention and being protected
In the case where, a variety of forms can also be made, these belong to the column of protection of the invention.
Claims (7)
1. a kind of fault detection method of DC distribution net, the described method comprises the following steps:
In first step (S1), the anode of the rectification side M and inverter side N of DC distribution net and the voltage and current of cathode are acquired,
Mode voltage and mould electric current are sought based on the voltage and current, wherein
Sp、SnRespectively indicate the voltage or current of anode and cathode, S1And S0Table respectively
Show 1 mould and zero mode voltage or electric current；
In second step (S2), the derivative of zero mode voltage is sought based on the mode voltage, wherein
Wherein, u0It is zero mode voltage, Δ t is sampling step length,
T is time, t=tsT is sought in expressionsThe zero mode voltage derivative at moment；
In third step (S3), the mould equivalent capacitance value C of the derivative identification two sides based on the mode voltage, whereinC is the mould equivalent capacitance value of identification, i0It is zero mould electric current；
In four steps (S4), sampled point when capacitor starts to stablize is determined, the mould identification capacitance for taking continuous multiple spot to calculate is full
First point of sufficient stable region is that capacitor starts stable sampled point, wherein
C is the mould equivalent capacitance value of identification, and i is sampling number, Δ C0For mould capacitance error；
In 5th step (S5), two sides traveling wave arrival time is determined, wherein m-th of the side M sampled point starts stable for capacitor
Point, then t at the time of correspondence at the time of the side M wavefront reaches for m sampled pointM, n-th of the side N sampled point is that capacitor starts to stablize
Point, the side N wavefront reach at the time of for n sampled point correspond at the time of tN；
In 6th step (S6), it is based on the two sides traveling wave arrival time positioning failure distance, wherein xM=[L-v0(tN-tM)]/
2, xMFor fault point to the distance of the side M, v0For the wave velocity of mode voltage and electric current, L is line length.
2. according to the method described in claim 1, wherein, it is preferred that in first step (S1), DC distribution net is flexible direct current
Power distribution network, rectification side and inverter side shunt capacitance.
3. according to the method described in claim 2, wherein, in third step (S3), the mould equivalent capacitance value of the two sides is equal to
The value of the shunt capacitance.
4. according to the method described in claim 2, wherein, being based on auspicious zero mould of carina road model modeling flexible direct current power distribution network of shellfish etc.
Network is imitated, the anode of the rectification side M and inverter side N of zero mould equivalent network of flexible direct current power distribution network and the voltage and electricity of cathode are acquired
Stream.
5. according to the method described in claim 1, wherein, in four steps (S4), taking the mould identification capacitor of continuous 3 points of calculating
First point that value meets stable region is that capacitor starts stable sampled point.
6. according to the method described in claim 1, wherein, in four steps (S4), mould capacitance error Δ C0For mould equivalent capacitance value
The 20% of C.
7. according to the method described in claim 2, wherein, in second step (S2), being based on the mode voltage by using 3 points
Numerical differentiation seeks the derivative of mode voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910762603.8A CN110470952A (en) | 2019-08-19 | 2019-08-19 | The fault detection method of DC distribution net |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910762603.8A CN110470952A (en) | 2019-08-19 | 2019-08-19 | The fault detection method of DC distribution net |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110470952A true CN110470952A (en) | 2019-11-19 |
Family
ID=68511008
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910762603.8A Pending CN110470952A (en) | 2019-08-19 | 2019-08-19 | The fault detection method of DC distribution net |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110470952A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113219237A (en) * | 2021-03-19 | 2021-08-06 | 云南电网有限责任公司昆明供电局 | Power distribution network ground fault time calibration method based on zero-mode voltage gradient value |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020047754A1 (en) * | 2000-09-07 | 2002-04-25 | Song Jong In | Traveling-wave amplifier having a II -type output transmission line structure |
| EP1508831A1 (en) * | 2003-08-18 | 2005-02-23 | Agilent Technologies Inc | Travelling-wave electroabsorption modulator with integral impedance matching network |
| CN103278747A (en) * | 2013-06-03 | 2013-09-04 | 东南大学 | High-tension transmission line single-ended traveling wave fault distance detection method combined with time-frequency characteristics |
| CN108199356A (en) * | 2017-12-29 | 2018-06-22 | 西安交通大学 | DC power transmission line ultra- high speed protection method based on wavefront information |
-
2019
- 2019-08-19 CN CN201910762603.8A patent/CN110470952A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020047754A1 (en) * | 2000-09-07 | 2002-04-25 | Song Jong In | Traveling-wave amplifier having a II -type output transmission line structure |
| EP1508831A1 (en) * | 2003-08-18 | 2005-02-23 | Agilent Technologies Inc | Travelling-wave electroabsorption modulator with integral impedance matching network |
| CN103278747A (en) * | 2013-06-03 | 2013-09-04 | 东南大学 | High-tension transmission line single-ended traveling wave fault distance detection method combined with time-frequency characteristics |
| CN108199356A (en) * | 2017-12-29 | 2018-06-22 | 西安交通大学 | DC power transmission line ultra- high speed protection method based on wavefront information |
Non-Patent Citations (3)
| Title |
|---|
| 宋国兵: "基于参数识别原理的VSC-HVDC输电线路单端故障定位", 《电网技术》 * |
| 徐海洋: "行波波头的参数识别方法在高压直流输电***中的应用", 《西安交通大学学报》 * |
| 王超: "输电线路行波测距技术的应用", 《云南电力技术》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113219237A (en) * | 2021-03-19 | 2021-08-06 | 云南电网有限责任公司昆明供电局 | Power distribution network ground fault time calibration method based on zero-mode voltage gradient value |
| CN113219237B (en) * | 2021-03-19 | 2024-01-05 | 云南电网有限责任公司昆明供电局 | Power distribution network ground fault moment calibration method based on zero-mode voltage gradient value |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106443340B (en) | A kind of parallel lines on same tower double back direct current transmission line double-end traveling wave fault positioning method | |
| WO2021043317A1 (en) | Transformer area identification method and method for constructing transformer area line topography | |
| CN105449676B (en) | Power distribution network Area Node network generation method and system | |
| CN103809082B (en) | A kind of distance-finding method of the one-phase earthing failure in electric distribution network based on the sudden change of line line ripple | |
| CN108173263A (en) | A kind of power distribution network topology error identification algorithm based on AMI measurement informations | |
| CN104393590B (en) | Electrical network Transient Instability pattern INTELLIGENT IDENTIFICATION method | |
| CN103714490B (en) | Large power grid on-line data multi-thread rapid-integration method | |
| CN105842580A (en) | Voltage sag source accurate location optimization method applicable to intelligent distribution network | |
| CN103267926A (en) | Data-gram (DG)-containing power distribution network fault distance measurement for fault feature matching based on differential evolution algorithm | |
| CN104537580A (en) | Method for constructing power distribution network frame based on K-means cluster | |
| CN104345249A (en) | Mixed modulus time domain fault positioning method for identical-tower double-loop direct current line | |
| CN107104421A (en) | A kind of voltage longitudinal protection method of distribution network comprising inverse distributed power | |
| CN106684863B (en) | A kind of discrimination method of power distribution network bus admittance matrix | |
| CN109444665A (en) | The unrelated Fault Locating Method of power distribution network multiple-limb overhead transmission line parameter and system | |
| CN105762777A (en) | Pilot protection method containing multi-T-connection inverter interfaced distributed generation power distribution network | |
| CN113659547A (en) | Power distribution network differential protection data synchronization method and system based on effective zero crossing point | |
| CN111541246A (en) | All-pure embedded calculation method for alternating current and direct current power flow of electric power system | |
| CN105929305B (en) | The non-whole mixed pressure double line down section identification of one kind and precision ranging method | |
| CN109217307A (en) | A kind of analysis method of Rural Power Distribution Network to " coal changes electricity " maximum receiving ability | |
| CN105162119B (en) | A kind of local correction tidal current computing method suitable for large-scale distribution network | |
| CN110470952A (en) | The fault detection method of DC distribution net | |
| CN109241678A (en) | The more topological Universal Simulation Models of modularization multi-level converter | |
| CN105891672A (en) | UPFC-contained line single-end traveling wave distance measurement method based on fault traveling wave line distribution characteristics | |
| CN105842582B (en) | Flexible direct current circuit fault distance measurement based on EMTR | |
| CN109342885B (en) | Method and system for positioning line fault of direct-current power distribution network |
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: 20191119 |
|
| RJ01 | Rejection of invention patent application after publication |