CN110261723A - A kind of small current earthing wire-selecting method based on the coefficient of variation and Higher Order Cumulants - Google Patents
A kind of small current earthing wire-selecting method based on the coefficient of variation and Higher Order Cumulants Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The present invention provides a kind of small current earthing wire-selecting method based on the coefficient of variation and Higher Order Cumulants, including when singlephase earth fault occurs for small current neutral grounding system, the transient zero-sequence current signal in the fault moment previous period Yu the latter period is recorded, the pure fault component signal of transient zero-sequence current is obtained；The solution that the pure fault component signal of the transient zero-sequence current of every route is carried out to the coefficient of variation, judges whether the polarity of every route is identical, if polarity is identical, is judged as bus-bar fault；If polarity is uniquely different, it is judged as line fault, and the unique different route of corresponding polarity is faulty line undetermined；Transient zero-sequence current signal after obtaining failure carries out variation mode decomposition to the transient zero-sequence current signal of every route, obtains IMF component；The higher order cumulants magnitude of every route IMF component is obtained, the corresponding maximum route of higher order cumulants magnitude judges the route for faulty line for faulty line undetermined if dual faulty line route selection result undetermined is identical.Detection accuracy of the present invention is high, applied widely, practical, is widely used in electric system.
Description
Technical field
The invention belongs to electric power system power distribution automatic technology and Electrical Safety fields, are related to a kind of power network neutral point warp
Selection method when singlephase earth fault occurs for arc suppression coil earthing system, and in particular to one kind is tired based on the coefficient of variation and high-order
The earthing wire-selecting method of accumulated amount.
Background technique
China's 6~66kV power supply system generallys use neutral non-effective grounding mode, including isolated neutral system,
Neutral by arc extinction coil grounding system and Neutral Grounding through Resistance in Electrical system, referred to as small current neutral grounding system, advantage exist
Small in earth current, system can continue to 1~2h of running, and power supply feasibility is high, but when generation permanent earth fault, in order to
It prevents from leading to failure propagation because of the raising of non-faulting phase voltage, insulation damages, it is necessary to rapidly and accurately select faulty line and give
With excision.
Small current neutral grounding system, especially neutral by arc extinction coil grounding system failure signal are small, are not easy to distinguish, to after
Electric protection and failure line selection bring very big difficulty.Low-current line selection method is broadly divided into two classes at present, is based on steady-state signal
Analysis and transient signal analysis；Since the steady-state component of fault current is smaller, lead to many earthing wire-selectings based on steady-state analysis
Device is ineffective, and main transient signal feature extracting method has: transient energy method, S-transformation, Pu Luoni (Prony) algorithm,
Relevant function method, WAVELET PACKET DECOMPOSITION, empirical mode decomposition, set mode decomposition, variation mode decomposition, Hilbert-Huang transform
Deng.
Summary of the invention
The present invention is a kind of small current earthing wire-selecting method based on the coefficient of variation and Higher Order Cumulants, its purpose is that distribution
Net system with non effectively earth ed neutral provides that a kind of accuracy is high, small current earthing wire-selecting method reliable for operation, especially exists
When judging bus-bar fault, method is easy, accurate.
In order to achieve the above object, technical solution proposed by the present invention is that one kind is connect based on the coefficient of variation with Higher Order Cumulants
Ground selection method, includes the following steps:
Step 1, when small current neutral grounding system occur singlephase earth fault when, by the feeder means on every route, obtain
Take the transient zero-sequence current of singlephase earth fault previous cycle and failure latter period；
Step 2 obtains the pure fault component signal of every route transient zero-sequence current；The coefficient of variation is carried out to this signal to ask
Solution judge whether the polarity of every route is identical according to the positive and negative of every route coefficient of variation, if polarity is identical, is judged as mother
Line failure；If polarity is uniquely different, it is judged as line fault, and the unique different route of corresponding polarity is faulty line undetermined,
And execute step 3；
Step 3, the transient zero-sequence current signal for obtaining every route after failure；Three layers of variation mould are carried out to the signal first
State is decomposed, and the IMF component of every route is obtained；
Step 4, the IMF component that every route is obtained according to step 3 carry out Higher Order Cumulants solution to IMF component, obtain
The higher order cumulants magnitude of every route, the corresponding maximum route of higher order cumulants magnitude are faulty line undetermined；
Step 5, using IMF component high order cumulants magnitude in the transient zero-sequence current coefficient of variation in step 2 and step 4, into
Row double characteristic failure line selection, if the route selection result of any double characteristic is identical, as faulty line.
In conclusion a whole feeder line is a branched line in small current neutral grounding system, filled on every branched line
If detection device or feed line automatization terminal, a kind of low current based on the coefficient of variation and Higher Order Cumulants of the present invention is connect
In ground selection method, when singlephase earth fault occurs for a feeder line, according to each detection device or the note of feed line automatization terminal
Record obtains the pure fault component signal of transient zero-sequence current；The pure fault component signal of the transient zero-sequence current of every route is become
The solution of different coefficient judges whether the polarity of every route is identical, if polarity is identical, is judged as bus-bar fault；If polarity is unique
Difference is judged as line fault, and the unique different route of corresponding polarity is faulty line undetermined；Every route after acquisition failure
Transient zero-sequence current signal, variation mode decomposition is carried out to the transient zero-sequence current signal of every route, obtains IMF component；
The higher order cumulants magnitude of every route IMF component is obtained, the corresponding maximum route of higher order cumulants magnitude is faulty line undetermined, if
Dual faulty line route selection result undetermined is identical, judges the route for faulty line.
Detailed description of the invention
Fig. 1 is a kind of totality of the small current earthing wire-selecting method based on the coefficient of variation and Higher Order Cumulants of the present invention
Flow diagram.
Fig. 2 is the idiographic flow schematic diagram of step 2 of the present invention.
Fig. 3 is the idiographic flow schematic diagram of step 3 of the present invention.
Fig. 4 is the idiographic flow schematic diagram of step 4 of the present invention.
Fig. 5 is the transmission of electricity model schematic of small current neutral grounding system overhead transmission line described in the embodiment of the present invention.
Fig. 6 is each route IMF1-1 component described in the embodiment of the present invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, the present invention is made into one below in conjunction with attached drawing
Step ground detailed description.
Fig. 1 is a kind of totality of the small current earthing wire-selecting method based on the coefficient of variation and Higher Order Cumulants of the present invention
Flow diagram.As shown, a kind of small current earthing wire-selecting side based on the coefficient of variation and Higher Order Cumulants of the present invention
Method includes the following steps:
Step 1, when small current neutral grounding system occur singlephase earth fault when, by the feeder means on every route, obtain
Take the transient zero-sequence current of singlephase earth fault previous cycle and failure latter period；
Step 2 obtains the pure fault component signal of every route transient zero-sequence current；The coefficient of variation is carried out to this signal to ask
Solution judge whether the polarity of every route is identical according to the positive and negative of every route coefficient of variation, if polarity is identical, is judged as mother
Line failure；If polarity is uniquely different, it is judged as line fault, and the unique different route of corresponding polarity is faulty line undetermined,
And execute step 3；
Step 3, the transient zero-sequence current signal for obtaining every route after failure；Three layers of variation mould are carried out to the signal first
State is decomposed, and the IMF component of every route is obtained；
Step 4, the IMF component that every route is obtained according to step 3 carry out Higher Order Cumulants solution to IMF component, obtain
The higher order cumulants magnitude of every route, the corresponding maximum route of higher order cumulants magnitude are faulty line undetermined；
Step 5, using IMF component high order cumulants magnitude in the transient zero-sequence current coefficient of variation in step 2 and step 4, into
Row double characteristic failure line selection, if the route selection result of any double characteristic is identical, as faulty line.
Fig. 2 is the idiographic flow schematic diagram of step 2 of the present invention.As shown, step 2 of the present invention specifically includes
Following steps:
Step 2.1, the transient zero-sequence current in the failure that will acquire latter period subtract the transient state zero of failure previous cycle
Sequence electric current obtains the pure fault component of transient zero-sequence current of every route；
The standard deviation and average value of the pure fault component of step 2.2, the transient zero-sequence current for seeking every route, every route
Standard deviation and average value ratio be every route the coefficient of variation；
Step 2.3, more every route coefficient of variation it is positive and negative, if the coefficient of variation of every route is positive and negative identical, as
The polarity of every route is identical, is judged as bus-bar fault, if polarity is uniquely different, for line fault, and corresponding polarity is unique
Different routes is faulty line undetermined.
In the method for the present invention, if the polarity of only one route and All other routes difference, which is faulty line, is
It further determines that faulty line, executes subsequent step.
Fig. 3 is the idiographic flow schematic diagram of step 3 of the present invention.As shown, step 3 of the present invention specifically includes
Following steps:
Step 3.1, the transient zero-sequence current signal for obtaining every route after failure carry out 2 layers of decomposition to this signal, obtain
IMF1 and IMF2；
Step 3.2 carries out 2 layers of variation mode decomposition to the IMF1 component that every route has been got again, obtains IMF1-
1 and IMF1-2；
In the method for the present invention, the decaying dc point reliably extracted in each route transient zero-sequence current is decomposed by two steps
Amount and industrial frequency AC component.
Fig. 4 is the idiographic flow schematic diagram of step 3 of the present invention.As shown, step 4 of the present invention specifically includes
Following steps:
Step 4.1 after carrying out 3 layers of variation mode decomposition to the transient zero-sequence current signal of every route after failure, obtains
Moment generating fuction φ (ω) can be obtained according to the component x of every route in IMF1-1 component x；
Step 4.2, φ (ω) are equal to the k rank square of x in the k order derivative of origin, by the conversion of k rank square and k rank cumulant
The Third-order cumulants of every route can be obtained in relationship；
Step 4.3 seeks absolute value to the Third-order cumulants of every route；
In the method for the present invention, Higher Order Cumulants can detecte the nonlinear characteristic of each line signal, if there is decaying in route
DC component, then Higher Order Cumulants can be accurately judged to the characteristic of each route, accurately reliably judge faulty line, when failure is closed
When lock angle is 90 °, decaying dc amount is approximately 0, and Higher Order Cumulants can equally be accurately judged to faulty line.
The present invention compared with prior art, has the advantage that
1) present invention uses the coefficient of variation, judges the polarity of the transient zero-sequence current by complete cycle subtractive method, can be effective
Judge bus whether failure, provide necessary condition for the judgement of line fault, and the judgement of bus and faulty line not by
The influence of transition resistance and switching angle.
2) present invention extracts the attenuating dc component and industrial frequency AC component of each route using variation mode decomposition, and leads to
Higher Order Cumulants are crossed to differentiate the fault signature of each route, this method being capable of reliable and effective judgement line fault.
3) present invention uses twin failure route selection judgment basis, avoids single route selection according to the drawback for mistake occur, energy
Effectively and rapidly judge faulty line.
Embodiment
Fig. 5 is the small current neutral grounding system transmission of electricity model described in the embodiment of the present invention by grounding through arc, every route
Installation detecting device.
In the present embodiment, the positive order parameter of overhead transmission line are as follows: R1=0.170 Ω/km, L1=1.20mH/km, C1=
9.697nF/km, Zero sequence parameter are as follows: R0=0.230 Ω/km, L0=5.480mH/km, C0=6nF/km；Three-phase voltage source
220KV；Transformer voltage ratio is 220/35, and connection type is Δ/Y；Arc suppression coil is set as overcompensation 8%, arc suppression coil resistance
About the 10% of induction reactance, 1 bringing onto load of route are 2MVA, and 3 bringing onto loads of route are 5MVA.
In the present invention, in the simulation model that foundation Fig. 5 is established, the sample frequency of sampling apparatus is 1M Ω, and route 1 exists
Singlephase earth fault occurs when 0.02S.Fault close angle is 90 °, and transition resistance is 100 Ω, to every route transient state after failure
Zero sequence current signal carries out three layers of variation mode decomposition, and obtained IMF1-1 is as shown in Figure 6.
When the method finds out 0 °, 60 °, 90 ° according to the present invention, different transition resistance RfWhen, the higher order cumulants of each route
Magnitude and the coefficient of variation, as shown in table 1,2,3,4,5,6,7.
Each route coefficient of variation when 10 ° of different transition resistances of table
Each route higher order cumulants magnitude when 20 ° of different transition resistances of table
Each route coefficient of variation when 3 60 ° of different transition resistances of table
Each route high order cumulants magnitude when 4 60 ° of different transition resistances of table
Each route coefficient of variation when 5 90 ° of different transition resistances of table
Each route higher order cumulants magnitude when 6 90 ° of different transition resistances of table
Each route coefficient of variation when 7 bus-bar fault of table
It can be seen that from Tables 1 and 2, the polarity of route 1 is different from All other routes, and the higher order cumulants magnitude of route 1 is maximum,
Therefore it can determine that route 1 is faulty line；It can be seen that from table 3 and table 4, the polarity of route 3 is different from All other routes, and route 3
Higher order cumulants magnitude is maximum, therefore can determine that route 3 is faulty line；It can be seen that from table 5 and table 6, the polarity of route 1 and other lines
Road is different, and the higher order cumulants magnitude of route 1 is obviously maximum, therefore can determine that route 1 is faulty line；Bus as can be seen from Table 7
When failure, each line polarity is identical, meets of the present invention；In turn, of the present invention a kind of tired based on the coefficient of variation and high-order
The small current earthing wire-selecting method of accumulated amount can accurately determine faulty line.
In conclusion the above is merely preferred embodiments of the present invention, being not intended to limit protection model of the invention
It encloses.All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in the present invention
Protection scope within.
Claims (3)
1. a kind of small current earthing wire-selecting method based on the coefficient of variation and Higher Order Cumulants, it is characterised in that, it is described single-phase to connect
Earth fault selection method includes the following steps:
Step 1, when singlephase earth fault occurs for small current neutral grounding system, pass through the feeder means on every route, obtain single
The transient zero-sequence current of phase ground fault previous cycle and failure latter period；
Step 2 obtains the pure fault component signal of every route transient zero-sequence current；The solution of the coefficient of variation is carried out to this signal,
According to the positive and negative of every route coefficient of variation, judge whether the polarity of every route identical, if polarity is identical, be judged as bus therefore
Barrier；If polarity is uniquely different, it is judged as line fault, and the unique different route of corresponding polarity is faulty line undetermined, and is held
Row step 3；
Step 3, the transient zero-sequence current signal for obtaining every route after failure；Three layers of variation mode point are carried out to the signal first
Solution, obtains the IMF component of every route；
Step 4, the IMF component that every route is obtained according to step 3 carry out Higher Order Cumulants solution to IMF component, obtain every
The higher order cumulants magnitude of route, the corresponding maximum route of higher order cumulants magnitude are faulty line undetermined；
Step 5 utilizes IMF component high order cumulants magnitude in the transient zero-sequence current coefficient of variation in step 2 and step 4, progress pair
Weight characteristic fault route selection, if the route selection result of any double characteristic is identical, as faulty line.
2. a kind of small current earthing wire-selecting method based on the coefficient of variation and Higher Order Cumulants according to claim, special
Sign is that the step 2 further includes following steps:
Step 2.1, the transient zero-sequence current in the failure that will acquire latter period subtract the transient zero-sequence electricity of failure previous cycle
Stream, obtains the pure fault component of transient zero-sequence current of every route；
The standard deviation and average value of the pure fault component of step 2.2, the transient zero-sequence current for seeking every route, the mark of every route
The ratio of quasi- difference and average value is the coefficient of variation of every route；
Step 2.3, more every route coefficient of variation it is positive and negative, if the coefficient of variation of every route is positive and negative identical, as every
The polarity of route is identical, is judged as bus-bar fault, if polarity is uniquely different, for line fault, and corresponding polarity is uniquely different
Route be faulty line undetermined.
3. a kind of small current earthing wire-selecting method based on the coefficient of variation and Higher Order Cumulants according to claim, special
Sign is that the step 4 further includes following steps:
Step 4.1 after carrying out 3 layers of variation mode decomposition to every route transient zero-sequence current signal of failure, obtains IMF1-1 points
X is measured, Moment generating fuction can be obtained according to the component x of every route；
Step 4.2, Moment generating fuction utilize the conversion of k rank square and k rank cumulant in the k rank square of the k order derivative x such as just of origin
The Third-order cumulants of every route can be obtained in relationship；
Step 4.3 seeks absolute value to the Third-order cumulants of every route.
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| CN114034987A (en) * | 2021-11-23 | 2022-02-11 | 东莞电力设计院有限公司 | Single-phase earth fault detection method based on zero-sequence component volatility |
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