CN107064727B - A kind of distribution network fault line selection method based on transient state energy difference - Google Patents

A kind of distribution network fault line selection method based on transient state energy difference Download PDF

Info

Publication number
CN107064727B
CN107064727B CN201610828508.XA CN201610828508A CN107064727B CN 107064727 B CN107064727 B CN 107064727B CN 201610828508 A CN201610828508 A CN 201610828508A CN 107064727 B CN107064727 B CN 107064727B
Authority
CN
China
Prior art keywords
route
transient state
state energy
fault
distribution network
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.)
Active
Application number
CN201610828508.XA
Other languages
Chinese (zh)
Other versions
CN107064727A (en
Inventor
束洪春
王书领
曹璞璘
沐润志
陈诺
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kunming University of Science and Technology
Original Assignee
Kunming University of Science and Technology
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kunming University of Science and Technology filed Critical Kunming University of Science and Technology
Priority to CN201610828508.XA priority Critical patent/CN107064727B/en
Publication of CN107064727A publication Critical patent/CN107064727A/en
Application granted granted Critical
Publication of CN107064727B publication Critical patent/CN107064727B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08Locating faults in cables, transmission lines, or networks
    • G01R31/081Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/086Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08Locating faults in cables, transmission lines, or networks
    • G01R31/088Aspects of digital computing

Abstract

The present invention relates to a kind of distribution network fault line selection methods based on transient state energy difference, belong to electric power system fault route selection technical field.The present invention builds distribution network simulation model according to the actual motion of power distribution network, and different routes and separate ground fault are arranged in simulation model, obtains each route of power distribution network and generates corresponding transient zero-sequence current and bus residual voltage signal under ground fault.Each feeder line zero-sequence current and residual voltage after selection failure in 5ms, seek the transient state energy and route transient state energy mean value in the 5ms after a failure of each route, route selection function is constructed using transient state energy and transient state energy mean value, when the route selection functional value of certain route is greater than transient state energy mean value, which is non-fault line;When the route selection functional value of certain route is equal to transient state energy mean value, which is faulty line.

Description

A kind of distribution network fault line selection method based on transient state energy difference
Technical field
The present invention relates to a kind of distribution network fault line selection methods based on transient state energy difference, belong to electric power system fault route selection Technical field.
Background technique
For the quantity and scale of the route of power distribution network all increasing, this increases very big work to power distribution network operation and maintenance It measures.And ground fault is often to send out fault type intractable in power distribution network, when the distribution of neutral by arc extinction coil grounding When singlephase earth fault occurs for net, symmetry is remained between the three-phase line voltage of power grid, since the compensation of arc suppression coil is made With the fault current of generation is smaller, and according to Operation of Electric Systems regulation, system can continue to run 1- with tape jam in this case 2h, it is not necessary to trip at once, keep the power supply continuity to load.A large amount of uses of the cable run in power distribution network at this stage cause For power distribution network when singlephase earth fault occurs, the zero sequence capacitance current of generation is larger, and power grid is avoided to operate with failure for a long time Make failure propagation at two o'clock or multipoint earthing short circuit, damages equipment, endanger the safe and stable operation of system, promptly and accurately determine Earth fault line, carrying out troubleshooting is particularly important.
Summary of the invention
The technical problem to be solved by the present invention is to propose a kind of distribution network fault line selection method based on transient state energy difference, mesh Be that can rapidly carry out select-line analysis when single-line ground failure occurs for route in power distribution network;Reduce live operation and maintenance Personnel carry out the workload of accident analysis, and quick lock in fault coverage, route selection accuracy rate is higher, and it is steady safely to can satisfy power distribution network Surely the needs run.
The technical scheme is that a kind of distribution network fault line selection method based on transient state energy difference, according to power distribution network Actual motion build distribution network simulation model, and different routes and separate ground fault are set in simulation model, are obtained Each route of power distribution network generates corresponding transient zero-sequence current and bus residual voltage signal under ground fault.After choosing failure Each feeder line zero-sequence current and residual voltage in 5ms, seek transient state energy in the 5ms after a failure of each route and route is temporary State average energy value constructs route selection function using transient state energy and transient state energy mean value, when the route selection functional value of certain route is greater than When transient state energy mean value, which is non-fault line;It, should when the route selection functional value of certain route is equal to transient state energy mean value Route is faulty line.
Specific steps are as follows:
(1) each route transient zero sequence current signal i is extracted0i(t) and bus residual voltage signal u0(t):
1. building distribution network electromagnetic transient simulation model according to the actual motion of substation in power distribution network;
2. different routes and separate ground fault are arranged in electromagnetic transient simulation model, obtain each route of power distribution network and be grounded Corresponding transient zero sequence current signal i is generated under failure0i(t) and bus residual voltage signal u0(t);
(2) i is utilized0i(t) and u0(t) the zero-sequence energy function W of route is definedi(t) and each route is acquired in failure generation Respective value in 5ms afterwards:
1. defining the zero-sequence energy function W of routei(t):
Wherein, WiIt (t) is the zero-sequence energy function on i-th line road after failure;u0It (t) is bus residual voltage;i0i(t) it is The zero-sequence current on i-th line road;N is feedback number of lines;
2. seeking the transient state energy W after each feeder fault in 5msiAre as follows:
3. seeking the transient state energy mean value of each N route
(3) transient state energy W is utilizediWith transient state energy mean valueConstruct route selection function Eifault:
1. defining route selection function Eifault:
2. route selection function EifaultFault distinguishing:
WhenRoute i is faulty line;
WhenRoute i is non-fault line.
The beneficial effects of the present invention are: the purpose of the present invention is realizing the failure line selection of power distribution network, using in fault-signal Transient state component realize route selection, do not influenced by fault close angle, and fault line detection nargin can be improved, while location design is simple, Accuracy is higher, and line selection algorithm is easily achieved.
Detailed description of the invention
Fig. 1 is present invention emulation distribution net work structure figure;
Specific embodiment
With reference to the accompanying drawings and detailed description, the invention will be further described.
Embodiment 1: a kind of distribution network fault line selection method based on transient state energy difference is taken according to the actual motion of power distribution network Distribution network simulation model is built, and different routes and separate ground fault are set in simulation model, obtains each route of power distribution network Corresponding transient zero sequence current signal i is generated under ground fault0i(t) and bus residual voltage signal u0(t);Choose failure Zero-sequence current i in 5ms afterwards0i(t) and residual voltage u0(t), then according to zero-sequence energy function Wi(t), each route is sought Transient state energy W in 5ms after a failurei, then route transient state energy mean value W is acquired, utilize transient state energy WiWith transient state energy mean value W constructs route selection function Eifault, whenWhen, route i is non-fault line;WhenRoute i is faulty line.
Specific steps are as follows:
(1) each route transient zero sequence current signal i is extracted0i(t) and bus residual voltage signal u0(t):
1. building distribution network electromagnetic transient simulation model according to the actual motion of substation in power distribution network;
2. different routes and separate ground fault are arranged in electromagnetic transient simulation model, obtain each route of power distribution network and be grounded Corresponding transient zero sequence current signal i is generated under failure0i(t) and bus residual voltage signal u0(t);
(2) i is utilized0i(t) and u0(t) the zero-sequence energy function W of route is definedi(t) and each route is acquired in failure generation Respective value in 5ms afterwards:
1. defining the zero-sequence energy function W of routei(t):
Wherein, WiIt (t) is the zero-sequence energy function on i-th line road after failure;u0It (t) is bus residual voltage;i0i(t) it is The zero-sequence current on i-th line road;N is feedback number of lines;
2. seeking the transient state energy W after each feeder fault in 5msiAre as follows:
3. seeking the transient state energy mean value of each N route
(3) transient state energy W is utilizediWith transient state energy mean valueConstruct route selection function Eifault:
1. defining route selection function Eifault:
2. route selection function EifaultFault distinguishing:
WhenRoute i is faulty line;
WhenRoute i is non-fault line.
Embodiment 2: the present embodiment other parts are same as Example 1, as shown in Figure 1,110kV/35kV distribution network simulation As shown in Figure 1, it has 6 feeder lines, Z-shaped transformer neutral point is grounded model by arc suppression coil series resistance.Overhead feeder L1=18km, L3=30km, L5=15km, line-cable mixing feeder line L4=14km, overhead feeder 12km, cable 2km, cable feedback Line L2=7km, L6=9km.G in the power grid is infinitely great power supply;T is main transformer, no-load voltage ratio 110kV/35kV, joint group It Wei not YN/d11;TZIt is zigzag transformer;L is arc suppression coil;R is the damping resistance of arc suppression coil.Feeder line using overhead transmission line, Three kinds of routes of overhead line-cable hybrid line and cable run.Load selects firm power load model.Feeder line L1Distance begins Hold A phase at 5 kilometers that singlephase earth fault, 10 Ω of ground resistance occurs, fault angle is 30 °, sample frequency 10kHz.Power distribution network After breaking down, zero-sequence current data and residual voltage data calculate in window when extracting each route 5ms after failure transient state energy, Transient state energy mean value and route selection function Efault(i)Value.Feeder line L1'sThat is feeder line L1 is faulty line, then route selection As a result correct.
In conjunction with attached drawing, the embodiment of the present invention is explained in detail above, but the present invention is not limited to above-mentioned Embodiment within the knowledge of a person skilled in the art can also be before not departing from present inventive concept Put that various changes can be made.

Claims (1)

1. a kind of distribution network fault line selection method based on transient state energy difference, it is characterised in that: according to the actual motion of power distribution network Distribution network simulation model is built, and different routes and separate ground fault are set in simulation model, obtains each line of power distribution network Road generates corresponding transient zero-sequence current and bus residual voltage signal under ground fault, each in 5ms after selection failure Feeder line zero-sequence current and residual voltage, seek transient state energy in the 5ms after a failure of each route and route transient state energy is equal Value constructs route selection function using transient state energy and transient state energy mean value, when the route selection functional value of certain route is greater than transient state energy When mean value, which is non-fault line;When the route selection functional value of certain route is equal to transient state energy mean value, which is event Hinder route;
Specific steps are as follows:
(1) each route transient zero sequence current signal i is extracted0i(t) and bus residual voltage signal u0(t):
1. building distribution network electromagnetic transient simulation model according to the actual motion of substation in power distribution network;
2. different routes and separate ground fault are arranged in electromagnetic transient simulation model, each route of power distribution network is obtained in ground fault It is lower to generate corresponding transient zero sequence current signal i0i(t) and bus residual voltage signal u0(t);
(2) i is utilized0i(t) and u0(t) the zero-sequence energy function W of route is definedi(t) and each route 5ms after the failure occurred is acquired Interior respective value:
1. defining the zero-sequence energy function W of routei(t):
Wherein, WiIt (t) is the zero-sequence energy function on i-th line road after failure;u0It (t) is bus residual voltage;i0iIt (t) is i-th The zero-sequence current of route;N is feedback number of lines;
2. seeking the transient state energy W after each feeder fault in 5msiAre as follows:
3. seeking the transient state energy mean value of each N route
(3) transient state energy W is utilizediWith transient state energy mean valueConstruct route selection function Eifault:
1. defining route selection function Eifault:
2. route selection function EifaultFault distinguishing:
WhenRoute i is faulty line;
WhenRoute i is non-fault line.
CN201610828508.XA 2016-09-18 2016-09-18 A kind of distribution network fault line selection method based on transient state energy difference Active CN107064727B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610828508.XA CN107064727B (en) 2016-09-18 2016-09-18 A kind of distribution network fault line selection method based on transient state energy difference

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610828508.XA CN107064727B (en) 2016-09-18 2016-09-18 A kind of distribution network fault line selection method based on transient state energy difference

Publications (2)

Publication Number Publication Date
CN107064727A CN107064727A (en) 2017-08-18
CN107064727B true CN107064727B (en) 2019-04-12

Family

ID=59616750

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201610828508.XA Active CN107064727B (en) 2016-09-18 2016-09-18 A kind of distribution network fault line selection method based on transient state energy difference

Country Status (1)

Country Link
CN (1) CN107064727B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108254657B (en) * 2018-03-28 2019-11-26 山东大学 Power distribution network section with low-current ground faults localization method based on Study of Transient Energy
CN109001592A (en) * 2018-07-03 2018-12-14 中国大唐集团科学技术研究院有限公司西北分公司 A kind of resonant earthed system fault line selection method for single-phase-to-ground fault based on transient

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2006112901A (en) * 2003-10-22 2007-11-27 Абб Оу (Fi) METHOD AND DEVICE FOR DETERMINING AN UNEXPECTED EARTHING VIOLATION
CN101188354A (en) * 2007-11-30 2008-05-28 昆明理工大学 Test simulation method for failure line selection of small current ground system
CN101546906A (en) * 2009-05-05 2009-09-30 昆明理工大学 Method for fault line selection of electric distribution network by using S transformation energy relative entropy
CN103941163A (en) * 2014-05-12 2014-07-23 福州大学 Resonant earthed system fault line selection method utilizing fuzzy K-means clustering

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2006112901A (en) * 2003-10-22 2007-11-27 Абб Оу (Fi) METHOD AND DEVICE FOR DETERMINING AN UNEXPECTED EARTHING VIOLATION
CN101188354A (en) * 2007-11-30 2008-05-28 昆明理工大学 Test simulation method for failure line selection of small current ground system
CN101546906A (en) * 2009-05-05 2009-09-30 昆明理工大学 Method for fault line selection of electric distribution network by using S transformation energy relative entropy
CN103941163A (en) * 2014-05-12 2014-07-23 福州大学 Resonant earthed system fault line selection method utilizing fuzzy K-means clustering

Also Published As

Publication number Publication date
CN107064727A (en) 2017-08-18

Similar Documents

Publication Publication Date Title
Zamani et al. A communication-assisted protection strategy for inverter-based medium-voltage microgrids
Dewadasa et al. Protection of microgrids using differential relays
CN101304170B (en) System debug method for high voltage direct current transmission project
CN102200563A (en) Line single-phase earth fault single-terminal location method based on positioning function amplitude characteristics
CN101334438B (en) Test method for eliminating effluence of DC engineering grounding electrode electric current on alternating-current system
CN102073795B (en) 110kV cable hybrid line switching overvoltage level prediction method
CN104375056B (en) Substation cable outgoing line fault monitoring method based on voltage and current initial row waves
CN105024364A (en) Analysis method for influence on distance protection caused by access of large-scale wind power equipment to AC/DC hybrid system
Petit et al. Directional relays without voltage sensors for distribution networks with distributed generation: Use of symmetrical components
CN107064727B (en) A kind of distribution network fault line selection method based on transient state energy difference
CN109001592A (en) A kind of resonant earthed system fault line selection method for single-phase-to-ground fault based on transient
CN103969548A (en) Grounding line selecting and ground fault section positioning method for arc suppression coil
CN103474974A (en) Distribution network single-phase ground protection method based on zero-sequence current sudden change straight line fitting direction
Tavares et al. Proposition of a half-wave length energization case test
CN106443334B (en) A kind of distribution network fault line selection method based on zero-sequence current difference Polarity comparision
Codino et al. Detection of cross-country faults in medium voltage distribution ring lines
Vasquez-Arnez et al. Tap-off power from a transmission line shield wires to feed small loads
Wang et al. Adaptive single-phase/three-phase reclosing scheme for transmission lines in passive network supplied by MMC-HVDC
CN107968387B (en) Means of relay controlling based on impedance plane analysis positive sequence polarization voltage
Shilong et al. Fault line selection of single phase grounding fault in small-current ground system based on reactive current
CN205246808U (en) Power cable fault line selection device
CN106300286B (en) A kind of synchronizing calculation method of power transmission line zero-sequence overcurrent protection starting element definite value
Si et al. The study on protection scheme for distribution system in presence of distributed generation
Yang et al. Optimal protection coordination for microgrid under different operating modes
ÇAKIL et al. Modeling of power network system of the high voltage substation: A simulation study

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant