CN109782115A - A kind of method of discrimination of the full compensation of ground failure vanishes of controllable voltage source - Google Patents
A kind of method of discrimination of the full compensation of ground failure vanishes of controllable voltage source Download PDFInfo
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- CN109782115A CN109782115A CN201910246915.3A CN201910246915A CN109782115A CN 109782115 A CN109782115 A CN 109782115A CN 201910246915 A CN201910246915 A CN 201910246915A CN 109782115 A CN109782115 A CN 109782115A
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- 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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/30—Reactive power compensation
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Abstract
The embodiment of the present application discloses a kind of method of discrimination of full compensation of ground failure vanishes of controllable voltage source, and the application proposes that after system single-phase earthing, controllable voltage source is compensated entirely.Keep controllable voltage source output voltage amplitude constant, change controllable voltage source output voltage phase angle, if before and after controllable voltage source output voltage phase angle changes, the phase angle of all route zero-sequence currents changes with controllable voltage source output voltage phase angle, then ground fault disappears at this time, and controllable voltage source stops compensation output.The application method is simple, it is accurate to calculate, strong applicability, individually full collocation structure or the full collocation structure of controllable voltage source parallel connection arc suppression coil can use controllable voltage source, provide a kind of method of discrimination easy, that effectively the ground fault under the full compensating coefficient of controllable voltage source earth current disappears.
Description
Technical field
This application involves the full compensation technique fields of power grid single-phase-to-ground current more particularly to a kind of controllable voltage source to compensate entirely
The method of discrimination that ground fault disappears.
Background technique
In network system, especially in low and medium voltage distribution network system, singlephase earth fault accounts for the absolute majority of failure sum.
The neutral grounding mode of low and medium voltage distribution network mainly have isolated neutral mode, neutral by arc extinction coil grounding mode or
Neutral point is through low resistance earthing mode.Under isolated neutral mode, earth current is not compensated for and operates with failure,
In the presence of person electric shock risk.Under neutral by arc extinction coil grounding mode, arc suppression coil is grounded in single-phase earthing post-compensation holds stream,
Ground arc can be extinguished, system can operate with failure, but there are still certain ground connection residual flows for grounding point, and there are still person electric shock wind
Danger.Neutral point is through passing through the route zero-sequenceprotection tripping ground path of protective relaying device, power supply under low resistance earthing mode
Reliability cannot ensure.
It is asked so ground fault how quick and precisely to be differentiated whether to disappear as those skilled in the art are urgently to be resolved
Topic.
Summary of the invention
This application provides a kind of method of discrimination of the full compensation of ground failure vanishes of controllable voltage source, to solve the prior art
In the problem of whether ground fault disappears cannot be quick and precisely differentiated.
The application provides a kind of method of discrimination of full compensation of ground failure vanishes of controllable voltage source, which comprises
After system single-phase earthing, controllable voltage source exports offset voltage and carries out grounding current compensation；
It keeps controllable voltage source output voltage amplitude constant, changes controllable voltage source output voltage phase angle, obtain controllable
Voltage source output voltage phase angle knots modification；
Calculate each route zero-sequence current phase angle after controllable voltage source output voltage phase angle changes preceding and change
Variable quantity absolute value；
Calculate the variable quantity absolute value of controllable voltage source output voltage phase angle knots modification and each route
Absolute difference；
If the absolute difference of each route is less than or equal to absolute difference threshold value, it is determined that ground fault disappears
It loses.
Further, the change direction for changing the voltage phase angle of controllable voltage source output includes clockwise or counterclockwise.
Further, controllable voltage source output voltage phase angle knots modification is at 0.3 ° -0.5 °.
Further, 15%- of the absolute difference threshold value in controllable voltage source output voltage phase angle knots modification
20%.
As seen from the above embodiment, the differentiation side of the full compensation of ground failure vanishes of a kind of controllable voltage source provided by the present application
Method, the application propose that after system single-phase earthing, controllable voltage source is compensated entirely.Keep controllable voltage source output voltage amplitude
It is constant, change controllable voltage source output voltage phase angle, if owned before and after controllable voltage source output voltage phase angle changes
The phase angle of route zero-sequence current changes with controllable voltage source output voltage phase angle, then ground fault disappears at this time, controllably
Voltage source stops compensation output.The application method is simple, and it is accurate to calculate, strong applicability, the independent full collocation structure of controllable voltage source
Or the full collocation structure of controllable voltage source parallel connection arc suppression coil can use, provide it is a kind of it is easy, effectively in controllable voltage source
The method of discrimination that ground fault under the full compensating coefficient of earth current disappears.
Detailed description of the invention
In order to illustrate more clearly of the technical solution of the application, letter will be made to attached drawing needed in the embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without any creative labor,
It is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of flow chart of the method for discrimination of the full compensation of ground failure vanishes of controllable voltage source provided by the present application.
Specific embodiment
To keep the purposes, technical schemes and advantages of the application clearer, below in conjunction with the application specific embodiment and
Technical scheme is clearly and completely described in corresponding attached drawing.Obviously, described embodiment is only the application one
Section Example, instead of all the embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not doing
Every other embodiment obtained under the premise of creative work out, shall fall in the protection scope of this application.Below in conjunction with attached drawing,
The technical scheme provided by various embodiments of the present application will be described in detail.
The earth current of network system compensates entirely, by grounding point current compensation to minimum, can be in single-phase earthing
System can still operate with failure, and eliminate the personal Danger Electric shock risk of grounding point, be a kind of advanced grounding current compensation mode.
Earth current based on controllable voltage source compensates entirely, passes through controllable voltage source output phase, the adjustable compensation of amplitude
Voltage generates compensation electric current, is grounded electric current and compensates entirely.Controllable voltage source compensates entirely may separate compensation, it is also possible to disappear
Arc coil is used in parallel.After controllable voltage source progress earth current compensates entirely, no matter whether singlephase earth fault disappears, and system is each
Phase phase voltage, the amplitude of residual voltage, phase relation are identical as single phase metal grounding phenomenon, can not by system phase voltage,
Amplitude, the phase relation of residual voltage judge whether ground fault disappears.
A kind of method of discrimination of the full compensation of ground failure vanishes of controllable voltage source provided by the present application, connects in controllable voltage source
Malfunction can be fast and accurately judged under the various topological structures that earth-current compensates entirely, be that controllable voltage source earth current is complete
The realization of compensation provides a kind of ground fault disappearance method of discrimination quickly, effectively, easy.
Refering to fig. 1, the application provides a kind of method of discrimination of full compensation of ground failure vanishes of controllable voltage source, the method
Include:
Step S101, after system single-phase earthing, controllable voltage source exports offset voltage and carries out grounding current compensation；
Step S102, it keeps controllable voltage source output voltage amplitude constant, changes controllable voltage source output voltage phase angle,
Obtain controllable voltage source output voltage phase angle knots modification；
Step S103, each route zero-sequence current after controllable voltage source output voltage phase angle changes preceding and change is calculated
The variable quantity absolute value at phase angle；
Step S104, the variable quantity of controllable voltage source output voltage phase angle knots modification and each route is calculated
The absolute difference of absolute value；
If step S105, the absolute difference of each route is less than or equal to absolute difference threshold value, it is determined that
Ground fault disappears.
Further, the change direction for changing the voltage phase angle of controllable voltage source output includes clockwise or counterclockwise.
Further, controllable voltage source output voltage phase angle knots modification is at 0.3 ° -0.5 °.
Further, 15%- of the absolute difference threshold value in controllable voltage source output voltage phase angle knots modification
20%.
As seen from the above embodiment, the application method is simple, and it is accurate to calculate, and strong applicability, controllable voltage source is individually mended entirely
Compensation structure or the full collocation structure of controllable voltage source parallel connection arc suppression coil can use, provide it is a kind of it is easy, effectively controllable
The method of discrimination that ground fault under the full compensating coefficient of voltage source earth current disappears.
Those skilled in the art will readily occur to its of the application after considering specification and practicing application disclosed herein
Its embodiment.This application is intended to cover any variations, uses, or adaptations of the application, these modifications, purposes or
Person's adaptive change follows the general principle of the application and including the undocumented common knowledge in the art of the application
Or conventional techniques.The description and examples are only to be considered as illustrative, and the true scope and spirit of the application are by following
Claim is pointed out.
It should be understood that the application is not limited to the precise structure that has been described above and shown in the drawings, and
And various modifications and changes may be made without departing from the scope thereof.Scope of the present application is only limited by the accompanying claims.
Claims (4)
1. a kind of method of discrimination of the full compensation of ground failure vanishes of controllable voltage source, which comprises
After system single-phase earthing, controllable voltage source exports offset voltage and carries out grounding current compensation；
It keeps controllable voltage source output voltage amplitude constant, changes controllable voltage source output voltage phase angle, obtain controllable voltage
Source output voltage phase angle knots modification；
Calculate the variation at each route zero-sequence current phase angle before controllable voltage source output voltage phase angle changes and after changing
Measure absolute value；
Calculate the difference of the variable quantity absolute value of controllable voltage source output voltage phase angle knots modification and each route
Absolute value；
If the absolute difference of each route is less than or equal to absolute difference threshold value, it is determined that ground fault disappears.
2. a kind of method of discrimination of the full compensation of ground failure vanishes of controllable voltage source according to claim 1, feature exist
In the change direction for changing the voltage phase angle of controllable voltage source output includes clockwise or counterclockwise.
3. a kind of method of discrimination of the full compensation of ground failure vanishes of controllable voltage source according to claim 1, feature exist
In controllable voltage source output voltage phase angle knots modification is at 0.3 ° -0.5 °.
4. a kind of method of discrimination of the full compensation of ground failure vanishes of controllable voltage source according to claim 1, feature exist
In 15%-20% of the absolute difference threshold value in controllable voltage source output voltage phase angle knots modification.
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| US20170016947A1 (en) * | 2015-07-15 | 2017-01-19 | Vale S.A. | Apparatus and method for ground-fault circuit interrupter for use in ground-return circuit |
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