CN108594067A - A kind of Multi-port direct-current distribution network line short fault distance measuring method - Google Patents
A kind of Multi-port direct-current distribution network line short fault distance measuring method Download PDFInfo
- Publication number
- CN108594067A CN108594067A CN201810282955.9A CN201810282955A CN108594067A CN 108594067 A CN108594067 A CN 108594067A CN 201810282955 A CN201810282955 A CN 201810282955A CN 108594067 A CN108594067 A CN 108594067A
- Authority
- CN
- China
- Prior art keywords
- fault
- circuit
- capacitance
- line
- auxiliary circuit
- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
-
- 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)
- Locating Faults (AREA)
Abstract
The invention discloses a kind of Multi-port direct-current distribution network line short fault distance measuring methods.Purpose is to solve the problems, such as multiple terminals mixed type DC distribution cable road fault localization.The present invention is provided with a fault localization auxiliary circuit on every section DC line of Multi-port direct-current distribution network, is made of capacitance, inductance, diode and switch；When monopole or bipolar short trouble occur for Multi-port direct-current distribution network circuit, after dc circuit breaker action, fault localization auxiliary circuit in line fault segment puts into operation, by the instantaneous voltage and current value that sample capacitance and inductance in auxiliary circuit simultaneously, the distance between auxiliary circuit and fault point are calculated, to quick fault point.The advantages that present invention has principle simple, and sample frequency is relatively low, and range accuracy is high.
Description
Technical field
The present invention relates to a kind of Multi-port direct-current distribution network line short fault distance measuring methods, belong to power distribution network relay protection event
Hinder ranging technology field.
Technical background
DC distribution network technology is currently the hot spot of electric system industry research, with the development of power electronic technique, electricity
Source converter (voltage sourced converters, VSC) and Modular multilevel converter (modular
Multilevel converter, MMC) it is rapidly developed.Various forms of converters access DC distribution nets structure together
At the DC distribution net of multiple terminals mixed type, compared with AC distribution net, it has the advantages that many protrusions；And it is also solution
The certainly effective way of current power load rapid growth.However, when short trouble occurs for DC line, various forms of transformation
The fault characteristic of device performance is different, therefore certain difficulty is caused to line fault ranging.
Currently, it is more for the research of high pressure long range direct current transmission line fault ranging both at home and abroad, and to circuit distance
Shorter DC distribution net Research on fault locating is less.Fault distance-finding method is broadly divided into transient method, traveling wave method and injection method.Temporarily
State method was discharged using the VSC of output end parallel connection bulky capacitor as research object using double-end converter bus capacitor when line fault
Voltage and current information in journey establishes Fault Location Algorithm, and this method needs GPS to carry out data synchronization；Traveling wave method is existed using traveling wave
The reflection characteristic of the discontinuous node of wave impedance calculates fault distance, and this method principle is simpler, is commonly used to long distance powedr transmission
Line fault ranging, when being applied on short-range circuit, error is larger and very high to hardware requirement.Injection method is in failure
Certain specific distance measuring signal is injected on circuit and carries out localization of fault, and range accuracy is higher, but operates more complex.No matter which kind of
Fault distance-finding method, it is all not mature enough at present, all need deeper into research.
When short trouble occurs for Multi-port direct-current distribution network, from economy and the angle of power system security,
Fault distance and fast quick-recovery faulty line must be determined in time.Therefore, Multi-port direct-current distribution network line fault ranging is studied
Technology has a very important significance.
Invention content
The present invention is provided with fault localization using Multi-port direct-current distribution network as research object on every section of DC line
Auxiliary circuit, including capacitance, inductance, diode and switch；Wherein, the anode of the anode of diode and DC line connects, and two
The cathode of pole pipe is connect with the first end of capacitance and inductance, and the second end of inductance and the input terminal of first switch connect, and first opens
Two output ends closed are connected respectively to the positive and negative electrode of DC line, the second end ground connection of capacitance, and with the input of second switch
End connection, the output end of second switch and the cathode of DC line connect；When short trouble occurs for Multi-port direct-current distribution network circuit
When, after dc circuit breaker action, the auxiliary circuit of line fault segment is put into operation, the distance of fault point is measured.
The present invention is to solve the problems, such as that the technical solution that Multi-port direct-current distribution network fault localization is taken is as follows：
In each segment of DC line be provided with a fault localization auxiliary circuit, including a capacitance, one
Inductance, a diode and two switches.When Multi-port direct-current distribution network works normally, the voltage on DC line is to auxiliary electricity
Road capacitor charging, and when short trouble occurs in it, auxiliary circuit capacitance provides voltage for line fault ranging.
When monopole ground short circuit failure occurs for a certain section of Multi-port direct-current distribution network circuit, in the fault section section,
Auxiliary circuit is connected by switching with the faulty line of monopole ground short circuit, forms discharge loop, while sampling in auxiliary circuit
The instantaneous voltage and electric current of capacitance and inductance calculate fault distance x according to formula (1)：
Wherein, x is the distance of line fault point junior range circuit, uc、uLWith i be respectively capacitance voltage in auxiliary circuit,
The instantaneous value of inductive drop and discharge current, imax1For the peak point current occurred in auxiliary circuit capacitance discharge process, ucm1For
imax1Go out the capacitance voltage of the auxiliary circuit of current moment, LsTo assist circuit inductance values, l0For DC line unit km length electricity
Inductance value.Formula (1) is derived by by formula (2) to formula (4)：
When bipolar short trouble occurs for a certain section of Multi-port direct-current distribution network circuit, in the fault section, auxiliary electricity
Road is devoted oneself to work by switch, and forms discharge loop with bipolar short circuit line, while sampling capacitance and inductance in auxiliary circuit
Instantaneous voltage and electric current, fault distance x is calculated according to formula (5)：
Wherein, x is the distance of line fault point junior range circuit, uc、uLWith i be respectively capacitance voltage in auxiliary circuit,
The instantaneous value of inductive drop and discharge current, imax2For the peak point current occurred in auxiliary circuit capacitance discharge process, ucm2For
imax2Go out the capacitance voltage of the auxiliary circuit of current moment, LsTo assist circuit inductance values, l0For DC line unit km length electricity
Inductance value.Formula (5) is derived by by formula (6) to formula (8)：
The beneficial effects of the present invention are：The auxiliary circuit of the present invention is installed on one end of track section, utilizes auxiliary electricity
The instantaneous voltage of capacitance and inductance, electric current carry out fault localization in road, do not need the measurement data of the other end, it is same not need clock
Device is walked, range unit cost can be reduced；Compared with common DC line fault distance measuring method, the present invention claims sampling frequency
Rate is relatively low, it is easy to accomplish；In addition, the distance measurement result of the present invention is not influenced by the initial voltage of capacitance, repeats and measure, ranging essence
Degree is high.
Description of the drawings
Attached drawing 1 is Multi-port direct-current distribution network structure chart.
Attached drawing 2 is fault localization auxiliary circuit schematic diagram.
Attached drawing 3 is Multi-port direct-current distribution network line monopole ground short circuit fault equivalence circuit diagram.
Attached drawing 4 is the bipolar short trouble equivalent circuit diagram of Multi-port direct-current distribution network circuit.
Attached drawing 5 is Multi-port direct-current distribution network line fault ranging flow chart.
Specific implementation mode
Specific embodiments of the present invention are illustrated below in conjunction with the accompanying drawings：
As shown in Fig. 1, containing multiple converters such as MMC, VSC, commutator transformers in Multi-port direct-current distribution network, in order to protect
Card Multi-port direct-current distribution network is safely and reliably run, and dc circuit breaker is configured in each railroad section Duan Jun.Using the present invention
It needs to be determined that line fault segment and fault type before method, then in given line fault segment, according to therefore
Hinder the access way of Type Control auxiliary circuit, and corresponding ranging formula is selected to carry out fault localization.
As shown in Fig. 2, the auxiliary circuit of fault localization is opened by a capacitance, an inductance, a diode and two
Close composition.When Multi-port direct-current distribution network circuit does not break down, the rated direct voltage on DC line passes through diode
D1It charges to capacitance C, until capacitance C voltage is just ended equal to cathode voltage, the effect of capacitance C is provided for fault localization
One initial voltage；When short trouble occurs for Multi-port direct-current distribution network circuit, current differential protection makes the straight of fault section section
Stream breaker quick acting selectively controls switch S according to short trouble type and closes then in corresponding fault section
It closes the ends a or the ends b carries out fault location, concrete operations are：1. when bipolar short trouble, being closed the ends S to a, while S ' is closed；②
When plus earth short trouble, the ends S to a are closed, while S ' is disconnected；3. when cathode ground short circuit failure, being closed the ends S to b, simultaneously
S ' is disconnected.
Multi-port direct-current distribution network simulation model is built in PSCAD/EMTC, runs the model, samples capacitance in auxiliary circuit
With the instantaneous value of the voltage and current of inductance, simulation parameter is arranged as follows：
DC line parameter r0=14.64m Ω/km, l0=0.5891mH/km；
Auxiliary circuit inductance value Ls=20mH；
Auxiliary circuit capacitance C=1000uF；
Line length is L=3km；
Emulation sample frequency is set as 20kHz.
When bipolar short trouble occurs for Multi-port direct-current distribution network, it is assumed that monopole occurs for Multi-port direct-current distribution network anode circuit
Ground short circuit failure, line differential protection will make the fast quick-action of dc circuit breaker that Multi-port direct-current distribution network respective bins section configures
Make, voltage and current is reduced to zero on DC line.So when auxiliary circuit is devoted oneself to work, Multi-port direct-current distribution network line monopole
Ground short circuit fault equivalence circuit is as shown in Fig. 3.
The discharge process of 3 equivalent circuit of attached drawing is the response of second-order circuit zero input state.U in figurecFor auxiliary circuit electricity
The instantaneous voltage of electric process is received, i is transient current, LsIt is auxiliary circuit switch to assist circuit inductance values, S, x is circuit event
Hinder point to auxiliary circuit distance, r0And l0Respectively DC line unit km length resistance and inductance, RfFor transition resistance.
3 equivalent circuit with reference to the accompanying drawings, the discharge process that auxiliary circuit capacitance can be listed by KVL are：
Second-Order RLC Filter Circuit circuit dynamic discharge process is always there are one peak point current, and inductive drop this moment is zero, therefore can be with
The equivalent resistance R that rlc circuit is found out according to this characteristic, as shown in formula (2)：
Wherein, imax1For peak point current in auxiliary circuit capacitance discharge process, ucm1For with imax1The auxiliary electricity at corresponding moment
Road capacitance voltage.
Due to ucThe capacitance current slope at corresponding moment is more hard to find to be taken, therefore utilizes the voltage u of auxiliary circuit inductanceL
And its inductance value LsRatio be worth to, as shown in formula (3)：
Simultaneous equations (1)~(3) can find out fault distance x, as shown in formula (4)：
Assuming that failure is happened at section III sections, fault distance 1.2km, then the u measured in experimentcm1、imax1、uc、uL
It is respectively with i：ucm1=99.4973V；imax1=19.8299A；uc=99.7871V；uL=2.6732V；I=19.3359A.
By above-mentioned experimental data, the fault distance obtained according to formula (4) is：
When bipolar short trouble occurs for Multi-port direct-current distribution network, the bipolar short trouble of Multi-port direct-current distribution network circuit at this time
Equivalent circuit is as shown in Fig. 4；The meaning of each variable is identical as attached drawing 3 in attached drawing 4.
4 equivalent circuit with reference to the accompanying drawings, the discharge process that auxiliary circuit capacitance can be listed by KVL are：
Similarly, can find out fault distance x is：
Wherein, imax2For peak point current in auxiliary circuit capacitance discharge process, ucm2For with imax2Corresponding moment auxiliary circuit
Capacitance voltage.
Also assume that failure is happened at section III sections, fault distance 1.2km, then the u measured in experimentcm2、imax2、
uc、uLIt is respectively with i：ucm2=99.4857V；imax2=19.7585A；uc=99.7823V；uL=2.6139V；I=
19.2614A。
By above-mentioned experimental data, the fault distance obtained according to formula (6) is：
Failure definition range error be ε=100% × | actual value-measured value |/L, then monopole ground short circuit failure with
The error of bipolar short trouble is respectively：ε1=0.34% ε2=0.24%.
There are three types of types, respectively plus earth short trouble, cathode ground connection for Multi-port direct-current distribution network line short fault
Short trouble and bipolar short trouble, combination failure type of the present invention give the survey of Multi-port direct-current distribution network line short fault
Away from flow chart, as shown in Fig. 5.
Table 1~2 be set forth Multi-port direct-current distribution network circuit occur monopole, bipolar failure distance measurement result.
The above is the preferred embodiment of the present invention, it is noted that without departing from the principles of the present invention,
The present invention can also be made several improvements, simplified and retouched, these also should be regarded as protection scope of the present invention.
1 monopole ground short circuit fault localization result of table
2 bipolar short trouble distance measurement result of table
Claims (4)
1. a kind of Multi-port direct-current distribution network line short fault distance measuring method, which is characterized in that the method is every in DC line
One end of one segment is provided with a fault localization auxiliary circuit, including a capacitance, an inductance, a diode and two
A switch；Wherein, the anode of the anode of diode and DC line connects, the first end of the cathode and capacitance and inductance of diode
Connection, the second end of inductance and the input terminal of first switch connect, and two output ends of first switch are connected respectively to AC line
The positive and negative electrode on road, the second end ground connection of capacitance, and connect with the input terminal of second switch, the output end and direct current of second switch
The cathode of circuit connects；When Multi-port direct-current distribution network normal operation, charged by diode pair capacitance on DC line；
When short trouble occurs, after dc circuit breaker action, the auxiliary circuit in line fault segment is put into, according to given
Fault localization step carry out fault localization.
2. a kind of Multi-port direct-current distribution network line short fault distance measuring method as described in claim 1, which is characterized in that work as hair
When raw monopole ground short circuit failure, given fault localization step refers to, in fault section section, auxiliary circuit is opened by first
Close and connected with the faulty line of monopole ground short circuit, form discharge loop, sampled in discharge process auxiliary circuit capacitance and
The instantaneous value of the voltage and current of inductance calculates fault distance x according to formula (1)：
Wherein, x is the distance of line fault point junior range circuit, uc、uLIt is respectively capacitance voltage in auxiliary circuit, inductance with i
The instantaneous value of voltage and discharge current, imax1For the peak point current occurred in auxiliary circuit capacitance discharge process, ucm1For imax1Go out
The capacitance voltage of the auxiliary circuit of current moment, LsTo assist circuit inductance values, l0For DC line unit km length inductance value.
3. a kind of Multi-port direct-current distribution network line short fault distance measuring method as described in claim 1, which is characterized in that work as hair
When raw bipolar short trouble, given fault localization step refers to, in fault section, auxiliary circuit is opened by first and second
It closes and is connected with bipolar short trouble circuit, form discharge loop, the capacitance and inductance of auxiliary circuit are sampled in discharge process
The instantaneous value of voltage and current calculates fault distance x according to formula (2)：
Wherein, x is the distance of line fault point junior range circuit, uc、uLIt is respectively capacitance voltage in auxiliary circuit, inductance with i
The instantaneous value of voltage and discharge current, imax2For the peak point current occurred in auxiliary circuit capacitance discharge process, ucm2For imax2Go out
The capacitance voltage of the auxiliary circuit of current moment, LsTo assist circuit inductance values, l0For DC line unit km length inductance value.
4. a kind of Multi-port direct-current distribution network line short fault distance measuring method as described in claim 2 and 3, which is characterized in that
Sample capacitance voltage u in auxiliary circuitc, inductive drop uLIt is set as 20kHz with the sample frequency of discharge current i.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810282955.9A CN108594067A (en) | 2018-04-02 | 2018-04-02 | A kind of Multi-port direct-current distribution network line short fault distance measuring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810282955.9A CN108594067A (en) | 2018-04-02 | 2018-04-02 | A kind of Multi-port direct-current distribution network line short fault distance measuring method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108594067A true CN108594067A (en) | 2018-09-28 |
Family
ID=63624118
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810282955.9A Pending CN108594067A (en) | 2018-04-02 | 2018-04-02 | A kind of Multi-port direct-current distribution network line short fault distance measuring method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108594067A (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109444669A (en) * | 2018-12-20 | 2019-03-08 | 上海交通大学 | For carrying out the method and device of fault localization to direct current distribution route |
| CN109657720A (en) * | 2018-12-20 | 2019-04-19 | 浙江大学 | A kind of inline diagnosis method of power transformer shorted-turn fault |
| CN110045234A (en) * | 2019-05-22 | 2019-07-23 | 广东工业大学 | A kind of DC distribution net line short fault localization auxiliary device |
| CN110161369A (en) * | 2019-04-11 | 2019-08-23 | 华北电力大学 | A kind of bipolar short trouble localization method of DC grid based on overhead transmission line RL model |
| CN110470947A (en) * | 2019-08-15 | 2019-11-19 | 天津大学 | A kind of ground electrode circuit fault distance-finding method suitable for MMC direct current system |
| CN110542834A (en) * | 2019-09-30 | 2019-12-06 | 国家电网有限公司 | direct-current power distribution network double-end ranging fault positioning method based on improved injection method |
| CN110824294A (en) * | 2019-10-18 | 2020-02-21 | 济南大学 | Flexible direct-current power distribution network bipolar short-circuit fault section identification and distance measurement method |
| CN110850230A (en) * | 2019-11-07 | 2020-02-28 | 天津大学 | Method for extracting interpolar short circuit fault characteristic quantity of direct current distribution network based on multi-wavelet theory |
| CN112051484A (en) * | 2020-09-02 | 2020-12-08 | 天津大学 | Low-voltage direct-current system single-end fault location method based on voltage balancer |
| CN113625111A (en) * | 2021-08-10 | 2021-11-09 | 山东科技大学 | Power distribution network fault location system and method based on additional power supply |
| TWI749941B (en) * | 2020-12-08 | 2021-12-11 | 興城科技股份有限公司 | Detecting device for abnormal coupled capacitance and detecting method thereof |
| CN114384376A (en) * | 2022-03-23 | 2022-04-22 | 浙江浙能能源服务有限公司 | Fault classification positioning method for direct-current power distribution network |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5566768A (en) * | 1978-11-13 | 1980-05-20 | Tokyo Electric Power Co Inc:The | Failure point determination system for transmission line failure point detection and transmission line protection |
| CN102081132A (en) * | 2010-12-04 | 2011-06-01 | 西南交通大学 | Two-end distance measuring method of transmission line fault under dynamic condition |
| CN102445634A (en) * | 2010-10-08 | 2012-05-09 | 黄洪全 | Power transmission line fault detection device |
| CN103245880A (en) * | 2013-04-19 | 2013-08-14 | 国家电网公司 | Small current grounding fault location method utilizing circuit equivalent parameter identification principle |
| US9009017B2 (en) * | 2009-10-30 | 2015-04-14 | Telefonaktiebolaget Lm Ericsson (Publ) | Arrangement and method relating to analysis of transmission lines |
| CN107064734A (en) * | 2017-03-17 | 2017-08-18 | 北京交通大学 | A kind of flexible direct current Fault Location for Distribution Network method of utilization fault transient process |
| CN107589344A (en) * | 2017-09-15 | 2018-01-16 | 广西电网有限责任公司电力科学研究院 | A kind of low-voltage power line Fault Locating Method based on probe current frequency analysis |
-
2018
- 2018-04-02 CN CN201810282955.9A patent/CN108594067A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5566768A (en) * | 1978-11-13 | 1980-05-20 | Tokyo Electric Power Co Inc:The | Failure point determination system for transmission line failure point detection and transmission line protection |
| US9009017B2 (en) * | 2009-10-30 | 2015-04-14 | Telefonaktiebolaget Lm Ericsson (Publ) | Arrangement and method relating to analysis of transmission lines |
| CN102445634A (en) * | 2010-10-08 | 2012-05-09 | 黄洪全 | Power transmission line fault detection device |
| CN102081132A (en) * | 2010-12-04 | 2011-06-01 | 西南交通大学 | Two-end distance measuring method of transmission line fault under dynamic condition |
| CN103245880A (en) * | 2013-04-19 | 2013-08-14 | 国家电网公司 | Small current grounding fault location method utilizing circuit equivalent parameter identification principle |
| CN107064734A (en) * | 2017-03-17 | 2017-08-18 | 北京交通大学 | A kind of flexible direct current Fault Location for Distribution Network method of utilization fault transient process |
| CN107589344A (en) * | 2017-09-15 | 2018-01-16 | 广西电网有限责任公司电力科学研究院 | A kind of low-voltage power line Fault Locating Method based on probe current frequency analysis |
Non-Patent Citations (1)
| Title |
|---|
| 张明: "多端柔性直流电网的故障定位方法", 《电力建设》 * |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109444669A (en) * | 2018-12-20 | 2019-03-08 | 上海交通大学 | For carrying out the method and device of fault localization to direct current distribution route |
| CN109657720A (en) * | 2018-12-20 | 2019-04-19 | 浙江大学 | A kind of inline diagnosis method of power transformer shorted-turn fault |
| CN110161369A (en) * | 2019-04-11 | 2019-08-23 | 华北电力大学 | A kind of bipolar short trouble localization method of DC grid based on overhead transmission line RL model |
| CN110045234A (en) * | 2019-05-22 | 2019-07-23 | 广东工业大学 | A kind of DC distribution net line short fault localization auxiliary device |
| CN110470947B (en) * | 2019-08-15 | 2021-08-31 | 天津大学 | Grounding electrode line fault distance measurement method suitable for MMC direct current system |
| CN110470947A (en) * | 2019-08-15 | 2019-11-19 | 天津大学 | A kind of ground electrode circuit fault distance-finding method suitable for MMC direct current system |
| CN110542834A (en) * | 2019-09-30 | 2019-12-06 | 国家电网有限公司 | direct-current power distribution network double-end ranging fault positioning method based on improved injection method |
| CN110824294A (en) * | 2019-10-18 | 2020-02-21 | 济南大学 | Flexible direct-current power distribution network bipolar short-circuit fault section identification and distance measurement method |
| CN110850230A (en) * | 2019-11-07 | 2020-02-28 | 天津大学 | Method for extracting interpolar short circuit fault characteristic quantity of direct current distribution network based on multi-wavelet theory |
| CN112051484A (en) * | 2020-09-02 | 2020-12-08 | 天津大学 | Low-voltage direct-current system single-end fault location method based on voltage balancer |
| TWI749941B (en) * | 2020-12-08 | 2021-12-11 | 興城科技股份有限公司 | Detecting device for abnormal coupled capacitance and detecting method thereof |
| CN113625111A (en) * | 2021-08-10 | 2021-11-09 | 山东科技大学 | Power distribution network fault location system and method based on additional power supply |
| CN113625111B (en) * | 2021-08-10 | 2024-05-28 | 山东科技大学 | Distribution network fault location system and method based on additional power supply |
| CN114384376A (en) * | 2022-03-23 | 2022-04-22 | 浙江浙能能源服务有限公司 | Fault classification positioning method for direct-current power distribution network |
| CN114384376B (en) * | 2022-03-23 | 2022-06-24 | 浙江浙能能源服务有限公司 | Fault classification positioning method for direct-current power distribution network |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108594067A (en) | A kind of Multi-port direct-current distribution network line short fault distance measuring method | |
| CN103018627B (en) | Adaptive fault type fault line detection method for non-effectively earthed system | |
| CN108594071B (en) | Single-phase earth fault detection method for neutral point small-resistance earth distribution network | |
| CN101546906B (en) | Method for fault line selection of electric distribution network by using S transformation energy relative entropy | |
| CN102126438B (en) | Electric split-phase non-interruption flexible connection-compensation device and method for traction electric network | |
| CN103245879B (en) | Based on the low current grounding localization method in transient reactive power direction | |
| CN103245880B (en) | Utilize the low current grounding localization method of line equivalent parameter recognition principle | |
| CN108254657A (en) | Power distribution network section with low-current ground faults localization method based on Study of Transient Energy | |
| CN107147095B (en) | A kind of device for inhibiting direct current and spuious harmonic current to enter transformer neutral point | |
| CN108599114B (en) | A kind of high voltage ac/dc combined hybrid system alternating current circuit transient state direction protection method | |
| CN103792465A (en) | Power distribution network one-phase grounding fault location method based on zero sequence voltage | |
| CN103364692B (en) | A kind of power distribution network single-phase grounded malfunction in grounded system selection method | |
| Akke et al. | Some improvements in the three-phase differential equation algorithm for fast transmission line protection | |
| CN110703045A (en) | RL model algorithm-based direct-current power distribution network fault location method | |
| CN105262069A (en) | High-voltage DC line pilot protection method based on fault DC component | |
| CN105606955B (en) | A kind of faulty line method of discrimination based on numerical differentiation and empirical mode decomposition | |
| Zheng et al. | A distance protection scheme for HVDC transmission lines based on the Steady-state parameter model | |
| CN110736900A (en) | distribution line single-phase earth fault line selection method based on directional traveling waves | |
| CN110456218A (en) | Fast failure selection method based on power frequency increment coefficient before and after medium resistance switching | |
| CN113300343A (en) | Flexible direct current power grid fault line identification method based on cosine similarity | |
| CN207408480U (en) | A kind of direct-current charging post detecting system | |
| CN114814463A (en) | Single-ended direct current distribution line single-pole ground fault location method | |
| CN113589106B (en) | Single-phase earth fault line discrimination method for neutral point non-effective earthing medium-voltage micro-grid | |
| Ke et al. | Protection schemes and settings of DC distribution systems | |
| Sun et al. | A novel method for pilot protection based on current fault component |
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 | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180928 |
|
| WD01 | Invention patent application deemed withdrawn after publication |