CN107064727A  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 PDFInfo
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 CN107064727A CN107064727A CN201610828508.XA CN201610828508A CN107064727A CN 107064727 A CN107064727 A CN 107064727A CN 201610828508 A CN201610828508 A CN 201610828508A CN 107064727 A CN107064727 A CN 107064727A
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 238000010187 selection method Methods 0.000 title claims abstract description 9
 238000004088 simulation Methods 0.000 claims abstract description 14
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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
Abstract
The present invention relates to a kind of distribution network fault line selection method 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 sets different circuits and separate earth fault in simulation model, obtains each circuit of power distribution network and corresponding transient zerosequence current and bus residual voltage signal are produced under earth fault.Choose each bar feeder line zerosequence current and residual voltage in 5ms after failure, ask for the transient state energy and circuit transient state energy average in the 5ms after a failure of each circuit, utilize transient state energy and transient state energy average construction route selection function, when the route selection functional value of certain circuit is more than transient state energy average, the circuit is nonfault line；When the route selection functional value of certain circuit is equal to transient state energy average, the circuit is faulty line.
Description
Technical field
The present invention relates to a kind of distribution network fault line selection method based on transient state energy difference, belong to electric power system fault route selection
Technical field.
Background technology
The quantity and scale of the circuit of power distribution network are all increasing, and this adds very big work to power distribution network operation maintenance
Measure.And earth fault is often to send out in power distribution network fault type intractable, when the distribution of neutral by arc extinction coil grounding
When singlephase earth fault occurs for net, symmetry is remained between the threephase line voltage of power network, because the compensation of arc suppression coil is made
With the fault current of generation is smaller, and according to Operation of Electric Systems code, system can continue to run with 1 with tape jam in this case
2h, it is not necessary to trip at once, keeps the power supply continuity to load.A large amount of use of the cable run in power distribution network causes at this stage
Power distribution network is when occurring singlephase earth fault, and the zero sequence capacitance current of generation is larger, it is to avoid power network operates with failure in longtime
Make failure propagation into or multipoint earthing short circuit at 2 points, damage equipment, endanger the safe and stable operation of system, promptly and accurately determine
Earth fault line, carries out troubleshooting and is particularly important.
The content of the invention
The technical problem to be solved in the present invention is to propose a kind of distribution network fault line selection method based on transient state energy difference, mesh
Be be directed to power distribution network in circuit occur singleline ground failure when can rapidly carry out selectline analysis；Reduce live operation maintenance
Personnel carry out the workload of accident analysis, and quick lock in fault coverage, route selection accuracy rate is higher, disclosure satisfy that power distribution network is steady safely
The need for fixed operation.
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 circuits and separate earth fault are set in simulation model, obtained
Each circuit of power distribution network produces corresponding transient zerosequence current and bus residual voltage signal under earth fault.Choose after failure
Each bar feeder line zerosequence current and residual voltage in 5ms, the transient state energy and circuit asked in the 5ms after a failure of each circuit are temporary
State average energy value, constructs route selection function, when the route selection functional value of certain circuit is more than using transient state energy and transient state energy average
During transient state energy average, the circuit is nonfault line；, should when the route selection functional value of certain circuit is equal to transient state energy average
Circuit is faulty line.
Concretely comprise the following steps：
(1) each circuit transient zero sequence current signal i is extracted_{0i}(t) with bus residual voltage signal u_{0}(t)：
1. distribution network electromagnetic transient simulation model is built according to the actual motion of transformer station in power distribution network；
2. different circuits and separate earth fault are set in electromagnetic transient simulation model, obtain each circuit of power distribution network in ground connection
Corresponding transient zero sequence current signal i is produced under failure_{0i}(t) with bus residual voltage signal u_{0}(t)；
(2) i is utilized_{0i}And u (t)_{0}(t) the zerosequence energy function W of circuit is defined_{i}(t) and try to achieve each circuit failure occur
Respective value in 5ms afterwards：
1. the zerosequence energy function W of circuit is defined_{i}(t)：
Wherein, W_{i}(t) it is the zerosequence energy function on ith line road after failure；u_{0}(t) it is bus residual voltage；i_{0i}(t) it is
The zerosequence current on ith line road；N is feedback number of lines；
2. the transient state energy W in 5ms after each feeder fault is asked for_{i}For：
3. the transient state energy average of each N bars circuit is asked for
(3) transient state energy W is utilized_{i}With transient state energy averageConstruct route selection function Ei_{fault}：
1. route selection function Ei is defined_{fault}：
2. route selection function Ei_{fault}Fault distinguishing：
WhenCircuit i is faulty line；
WhenCircuit i is nonfault line.
The beneficial effects of the invention are as follows：The purpose of the present invention is to realize the failure line selection of power distribution network, using in faultsignal
Transient state component realize route selection, do not influenceed by fault close angle, and can improve fault line detection nargin, while location design is simple,
The degree of accuracy is higher, and line selection algorithm is easily achieved.
Brief description of the drawings
Fig. 1 is present invention emulation distribution net work structure figure；
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, takes according to the actual motion of power distribution network
Distribution network simulation model is built, and different circuits and separate earth fault are set in simulation model, each circuit of power distribution network is obtained
Corresponding transient zero sequence current signal i is produced under earth fault_{0i}(t) with bus residual voltage signal u_{0}(t)；Choose failure
Zerosequence current i in 5ms afterwards_{0i}(t) with residual voltage u_{0}(t), then according to zerosequence energy function W_{i}(t) each circuit, is asked for
Transient state energy W in 5ms after a failure_{i}, then try to achieve circuit transient state energy averageUtilize transient state energy W_{i}It is equal with transient state energy
ValueConstruct route selection function Ei_{fault}, whenWhen, circuit i is nonfault line；WhenCircuit i is fault wire
Road.
Concretely comprise the following steps：
(1) each circuit transient zero sequence current signal i is extracted_{0i}(t) with bus residual voltage signal u_{0}(t)：
1. distribution network electromagnetic transient simulation model is built according to the actual motion of transformer station in power distribution network；
2. different circuits and separate earth fault are set in electromagnetic transient simulation model, obtain each circuit of power distribution network in ground connection
Corresponding transient zero sequence current signal i is produced under failure_{0i}(t) with bus residual voltage signal u_{0}(t)；
(2) i is utilized_{0i}And u (t)_{0}(t) the zerosequence energy function W of circuit is defined_{i}(t) and try to achieve each circuit failure occur
Respective value in 5ms afterwards：
1. the zerosequence energy function W of circuit is defined_{i}(t)：
Wherein, W_{i}(t) it is the zerosequence energy function on ith line road after failure；u_{0}(t) it is bus residual voltage；i_{0i}(t) it is
The zerosequence current on ith line road；N is feedback number of lines；
2. the transient state energy W in 5ms after each feeder fault is asked for_{i}For：
3. the transient state energy average of each N bars circuit is asked for
(3) transient state energy W is utilized_{i}With transient state energy averageConstruct route selection function Ei_{fault}：
1. route selection function Ei is defined_{fault}：
2. route selection function Ei_{fault}Fault distinguishing：
WhenCircuit i is faulty line；
WhenCircuit i is nonfault line.
Embodiment 2：The present embodiment other parts are same as Example 1, as shown in figure 1,110kV/35kV distribution network simulations
Model is as shown in figure 1, it has 6 feeder lines, and Zshaped transformer neutral point is grounded by arc suppression coil series resistance.Overhead feeder
L_{1}=18km, L_{3}=30km, L_{5}=15km, linecable mixing feeder line L_{4}=14km, its overhead feeder 12km, cable 2km, cable feedback
Line L_{2}=7km, L_{6}=9km.G in the power network is infinitely great power supply；T is main transformer, and noload voltage ratio is 110kV/35kV, joint group
Wei not Y_{N}/d11；T_{Z}It 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 circuits of overhead linecable hybrid line and cable run.Load selects firm power load model.Feeder line L_{1}Distance begins
5 km A phases are held to occur singlephase earth fault, the Ω of grounding resistance 10, fault angle is 30 °, and sample frequency is 10kHz.Power distribution network
After breaking down, zerosequence current data and residual voltage data are calculated in window when extracting each circuit 5ms after failure transient state energy,
Transient state energy average and route selection function E_{fault(i)}Value.Feeder line L1'sThat is feeder line L1 is faulty line, then route selection
As a result it is correct.
Above in association with accompanying drawing to the present invention embodiment be explained in detail, but the present invention be not limited to it is abovementioned
Embodiment, can also be before present inventive concept not be departed from the knowledge that those of ordinary skill in the art possess
Put that various changes can be made.
Claims (2)
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 circuits and separate earth fault are set in simulation model, each line of power distribution network is obtained
Road produces corresponding transient zerosequence current and bus residual voltage signal under earth fault.Choose each in 5ms after failure
Bar feeder line zerosequence current and residual voltage, the transient state energy and circuit transient state energy asked in the 5ms after a failure of each circuit are equal
Value, route selection function is constructed using transient state energy and transient state energy average, when the route selection functional value of certain circuit is more than transient state energy
During average, the circuit is nonfault line；When the route selection functional value of certain circuit is equal to transient state energy average, the circuit is event
Hinder circuit.
2. the distribution network fault line selection method according to claim 1 based on transient state energy difference, it is characterised in that specific step
Suddenly it is：
(1) each circuit transient zero sequence current signal i is extracted_{0i}(t) with bus residual voltage signal u_{0}(t)：
1. distribution network electromagnetic transient simulation model is built according to the actual motion of transformer station in power distribution network；
2. different circuits and separate earth fault are set in electromagnetic transient simulation model, obtain each circuit of power distribution network in earth fault
It is lower to produce corresponding transient zero sequence current signal i_{0i}(t) with bus residual voltage signal u_{0}(t)；
(2) i is utilized_{0i}And u (t)_{0}(t) the zerosequence energy function W of circuit is defined_{i}(t) and try to achieve each circuit failure generation after 5ms
Interior respective value：
1. the zerosequence energy function W of circuit is defined_{i}(t)：
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Wherein, W_{i}(t) it is the zerosequence energy function on ith line road after failure；u_{0}(t) it is bus residual voltage；i_{0i}(t) it is ith
The zerosequence current of circuit；N is feedback number of lines；
2. the transient state energy W in 5ms after each feeder fault is asked for_{i}For：
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(3) transient state energy W is utilized_{i}With transient state energy averageConstruct route selection function Ei_{fault}：
1. route selection function Ei is defined_{fault}：
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2. route selection function Ei_{fault}Fault distinguishing：
WhenCircuit i is faulty line；
WhenCircuit i is nonfault line.
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CN108254657A (en) *  20180328  20180706  山东大学  Power distribution network section with lowcurrent ground faults localization method based on Study of Transient Energy 
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RU2006112901A (en) *  20031022  20071127  Абб Оу (Fi)  METHOD AND DEVICE FOR DETERMINING AN UNEXPECTED EARTHING VIOLATION 
CN101188354A (en) *  20071130  20080528  昆明理工大学  Test simulation method for failure line selection of small current ground system 
CN101546906A (en) *  20090505  20090930  昆明理工大学  Method for fault line selection of electric distribution network by using S transformation energy relative entropy 
CN103941163A (en) *  20140512  20140723  福州大学  Resonant earthed system fault line selection method utilizing fuzzy Kmeans clustering 

2016
 20160918 CN CN201610828508.XA patent/CN107064727B/en active Active
Patent Citations (4)
Publication number  Priority date  Publication date  Assignee  Title 

RU2006112901A (en) *  20031022  20071127  Абб Оу (Fi)  METHOD AND DEVICE FOR DETERMINING AN UNEXPECTED EARTHING VIOLATION 
CN101188354A (en) *  20071130  20080528  昆明理工大学  Test simulation method for failure line selection of small current ground system 
CN101546906A (en) *  20090505  20090930  昆明理工大学  Method for fault line selection of electric distribution network by using S transformation energy relative entropy 
CN103941163A (en) *  20140512  20140723  福州大学  Resonant earthed system fault line selection method utilizing fuzzy Kmeans clustering 
Cited By (2)
Publication number  Priority date  Publication date  Assignee  Title 

CN108254657A (en) *  20180328  20180706  山东大学  Power distribution network section with lowcurrent ground faults localization method based on Study of Transient Energy 
CN108254657B (en) *  20180328  20191126  山东大学  Power distribution network section with lowcurrent ground faults localization method based on Study of Transient Energy 
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