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 PDFInfo
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- 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
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- 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
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- 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
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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
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.
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| 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 |
| CN109001592B (en) * | 2018-07-03 | 2021-10-15 | 中国大唐集团科学技术研究院有限公司西北分公司 | Transient-quantity-based single-phase earth fault line selection method for resonance grounding system |
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| 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 |
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| 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 |
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