CN109782117A - A kind of ground fault disappearance method of discrimination based on controllable voltage source range-adjusting - Google Patents
A kind of ground fault disappearance method of discrimination based on controllable voltage source range-adjusting Download PDFInfo
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- CN109782117A CN109782117A CN201910254883.1A CN201910254883A CN109782117A CN 109782117 A CN109782117 A CN 109782117A CN 201910254883 A CN201910254883 A CN 201910254883A CN 109782117 A CN109782117 A CN 109782117A
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Abstract
The application discloses a kind of ground fault disappearance method of discrimination based on controllable voltage source range-adjusting, comprising: after single-phase earthing, controllable voltage source exports offset voltage and carries out grounding current compensation；It keeps controllable voltage source output voltage phase angle constant, changes the controllable voltage source output voltage amplitude；According to the front and back controllable voltage source output voltage amplitude is changed, the absolute value of each route zero-sequence current phase angle variations amount is calculated；Judge whether ground fault disappears according to the absolute value of the route zero-sequence current phase angle variations amount.The application can fast and accurately judge malfunction under the various topological structures that controllable voltage source earth current compensates entirely, a kind of ground fault disappearance method of discrimination quickly, effectively, easy is provided for the realization that controllable voltage source earth current compensates entirely, it is simple with implementation method, it is accurate to calculate, strong applicability, controllable voltage source the advantages that individually full collocation structure or the full collocation structure of controllable voltage source parallel connection arc suppression coil can use.
Description
Technical field
This application involves the full compensation technique fields of power grid single-phase-to-ground current, in particular to a kind of to be based on controllable voltage source width
It is worth the ground fault disappearance method of discrimination of adjustment.
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.The earth current of network system compensates entirely, can be in single-phase earthing, by grounding point current compensation to pole
Small value, 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 side
Formula.
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.
Summary of the invention
The application's is designed to provide a kind of ground fault disappearance method of discrimination based on controllable voltage source range-adjusting,
To solve the problems, such as not judging whether ground fault disappears by system phase voltage, the amplitude of residual voltage, phase relation.
According to an embodiment of the present application, a kind of ground fault disappearance differentiation based on controllable voltage source range-adjusting is provided
Method, comprising:
After single-phase earthing, controllable voltage source exports offset voltage and carries out grounding current compensation；
It keeps controllable voltage source output voltage phase angle constant, changes the controllable voltage source output voltage amplitude；
According to the front and back controllable voltage source output voltage amplitude is changed, each route zero-sequence current phase angle variations amount is calculated
Absolute value；
Judge whether ground fault disappears according to the absolute value of the route zero-sequence current phase angle variations amount.
Further, the absolute value according to route zero-sequence current phase angle variations amount judges whether ground fault disappears
The step of, comprising:
If the absolute value of all route zero-sequence current phase angle variations amounts changes less than or equal to preset phase angle
Amount, ground fault disappear；
If the absolute value of at least one route zero-sequence current phase angle variations amount changes greater than preset phase angle
Amount, ground fault do not disappear.
Further, the controllable voltage source output voltage amplitude is 0.1kV-0.2kV.
Further, preset phase angle variable quantity is 0.15 ° -0.2 °.
From the above technical scheme, the embodiment of the present application provides a kind of ground connection based on controllable voltage source range-adjusting
Failure vanishes method of discrimination, comprising: after single-phase earthing, controllable voltage source exports offset voltage and carries out grounding current compensation；It keeps
Controllable voltage source output voltage phase angle is constant, changes the controllable voltage source output voltage amplitude；Before and after changing
The controllable voltage source output voltage amplitude calculates the absolute value of each route zero-sequence current phase angle variations amount；According to the line
The absolute value of road zero-sequence current phase angle variations amount judges whether ground fault disappears.The application is in controllable voltage source earth current
Malfunction can be fast and accurately judged under the various topological structures compensated entirely, compensated entirely for controllable voltage source earth current
It realizes and a kind of ground fault disappearance method of discrimination quickly, effectively, easy is provided, have implementation method simple, it is accurate to calculate, and fits
It is strong with property, controllable voltage source individually full collocation structure or the full collocation structure of controllable voltage source parallel connection arc suppression coil can use etc. it is excellent
Point.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the application
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is that a kind of ground fault disappearance differentiation based on controllable voltage source range-adjusting is shown according to the embodiment of the present application
The flow chart of method；
Fig. 2 is that show that a kind of controllable voltage source is implemented separately that earth current compensates entirely according to the embodiment of the present application electrical returns
The circuit diagram on road；
Fig. 3 is to show a kind of controllable voltage source parallel connection arc suppression coil according to the embodiment of the present application and be grounded electric current to compensate entirely
Electric loop circuit diagram.
Specific embodiment
Refering to fig. 1, embodiments herein provides a kind of ground fault disappearance based on controllable voltage source range-adjusting
Method of discrimination, comprising:
Step S1, after single-phase earthing, controllable voltage source exports offset voltage and carries out grounding current compensation；
Step S2, it keeps controllable voltage source output voltage phase angle constant, changes the controllable voltage source output electricity
Pressure amplitude value；
Step S3, according to the front and back controllable voltage source output voltage amplitude is changed, each route zero-sequence current phase is calculated
The absolute value of angle variable quantity；
Step S4, judge whether ground fault disappears according to the absolute value of the route zero-sequence current phase angle variations amount.
Refering to Fig. 2 and Fig. 3, Fig. 2 and Fig. 3 are that two kinds of controllable voltage source earth currents compensate circuit entirely, and the application is to two kinds
Fundamental circuit can be effectively applicable in, and compensate circuit entirely if any other similar controllable voltage source earth currents, can also apply this Shen
The method that please be provided carries out the disappearance of controllable voltage source ground fault and differentiates.
From the above technical scheme, the embodiment of the present application provides a kind of ground connection based on controllable voltage source range-adjusting
Failure vanishes method of discrimination, comprising: after single-phase earthing, controllable voltage source exports offset voltage and carries out grounding current compensation；It keeps
Controllable voltage source output voltage phase angle is constant, changes the controllable voltage source output voltage amplitude；Before and after changing
The controllable voltage source output voltage amplitude calculates the absolute value of each route zero-sequence current phase angle variations amount；According to the line
The absolute value of road zero-sequence current phase angle variations amount judges whether ground fault disappears.The application is in controllable voltage source earth current
Malfunction can be fast and accurately judged under the various topological structures compensated entirely, compensated entirely for controllable voltage source earth current
It realizes and a kind of ground fault disappearance method of discrimination quickly, effectively, easy is provided, have implementation method simple, it is accurate to calculate, and fits
It is strong with property, controllable voltage source individually full collocation structure or the full collocation structure of controllable voltage source parallel connection arc suppression coil can use etc. it is excellent
Point.
Further, the absolute value according to route zero-sequence current phase angle variations amount judges whether ground fault disappears
The step of, comprising:
If the absolute value of all route zero-sequence current phase angle variations amounts changes less than or equal to preset phase angle
Amount, ground fault disappear；
If the absolute value of at least one route zero-sequence current phase angle variations amount changes greater than preset phase angle
Amount, ground fault do not disappear.
Further, the controllable voltage source output voltage amplitude is 0.1kV-0.2kV.
Further, preset phase angle variable quantity is 0.15 ° -0.2 °.
From the above technical scheme, the embodiment of the present application provides a kind of ground connection based on controllable voltage source range-adjusting
Failure vanishes method of discrimination, including after single-phase earthing, controllable voltage source exports offset voltage and carries out grounding current compensation；Keep institute
It is constant to state controllable voltage source output voltage phase angle, changes the controllable voltage source output voltage amplitude；According to institute before and after changing
Controllable voltage source output voltage amplitude is stated, the absolute value of each route zero-sequence current phase angle variations amount is calculated；According to the route
The absolute value of zero-sequence current phase angle variations amount judges whether ground fault disappears.The application is complete in controllable voltage source earth current
Malfunction can be fast and accurately judged under the various topological structures of compensation, the reality compensated entirely for controllable voltage source earth current
A kind of ground fault disappearance method of discrimination quickly, effectively, easy is now provided, has implementation method simple, it is accurate to calculate, and is applicable in
Property is strong, controllable voltage source individually full collocation structure or the full collocation structure of controllable voltage source parallel connection arc suppression coil can use etc. it is excellent
Point.
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 ground fault disappearance method of discrimination based on controllable voltage source range-adjusting characterized by comprising
After single-phase earthing, controllable voltage source exports offset voltage and carries out grounding current compensation；
It keeps controllable voltage source output voltage phase angle constant, changes the controllable voltage source output voltage amplitude；
According to the front and back controllable voltage source output voltage amplitude is changed, the exhausted of each route zero-sequence current phase angle variations amount is calculated
To value；
Judge whether ground fault disappears according to the absolute value of the route zero-sequence current phase angle variations amount.
2. the method according to claim 1, wherein described according to the exhausted of route zero-sequence current phase angle variations amount
The step of whether ground fault disappears is judged to value, comprising:
If the absolute value of all route zero-sequence current phase angle variations amounts is less than or equal to preset phase angle variable quantity, connect
Earth fault disappears；
If the absolute value of at least one route zero-sequence current phase angle variations amount is greater than preset phase angle variable quantity, connect
Earth fault does not disappear.
3. the method according to claim 1, wherein the controllable voltage source output voltage amplitude is 0.1kV-
0.2kV。
4. the method according to claim 1, wherein preset phase angle variable quantity is 0.15 ° -0.2 °.
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