CN109713654A - The positioning and guard method of distributed flexible ground fault based on controllable voltage source - Google Patents
The positioning and guard method of distributed flexible ground fault based on controllable voltage source Download PDFInfo
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Abstract
The embodiment of the present application provides the positioning and guard method of a kind of distributed flexible ground fault based on controllable voltage source, which comprises judges whether current system occurs singlephase earth fault；If it is, the rule for being zero according to the earth current for obtaining fault point, determines the output voltage and output electric current of controllable voltage source compensation device；After the predesigned compensation time, whether detection singlephase earth fault is eliminated；If it is not, then that improves the controllable voltage source compensation device outputs current to default output current value；Under the default output current value, the zero-sequence current of current line front end and the zero-sequence current of the current line rear end are obtained；If the difference of the zero-sequence current of the current line front end and the zero-sequence current of the current line rear end is greater than predetermined current difference, the breaker of the current line is disconnected.
Description
Technical field
This application involves the positioning of power distribution network single-phase earthing and protection field more particularly to a kind of points based on controllable voltage source
The positioning and guard method of cloth flexible ground failure.
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 and
Neutral Point Through Low Resistance mode.Under isolated neutral mode, earth current is not compensated for and operates with failure, and deposits
In 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, energy
Enough extinguish ground arc, 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；Under Neutral Point Through Low Resistance mode, by the route zero-sequenceprotection tripping ground path of protective relaying device, power supply can
It cannot be ensured by property, and under Neutral Point Through Low Resistance mode, when high resistance ground occurs, since fault current is compared with metallicity
Ground connection greatly reduces, and is not enough to start route zero-sequenceprotection, often failure is caused further to develop, and can bring to network system
Bigger harm.
Summary of the invention
The positioning and guard method for the distributed flexible ground fault based on controllable voltage source that this application provides a kind of, energy
Enough accurate judgement abort situation, and guarantee line security.
The application first aspect provides positioning and the guarantor of a kind of distributed flexible ground fault based on controllable voltage source
Maintaining method, which comprises
Judge whether current system occurs singlephase earth fault；
If it is, the rule for being zero according to the earth current for obtaining fault point, determines controllable voltage source compensation device
Output voltage and output electric current；
After the predesigned compensation time, whether detection singlephase earth fault is eliminated；
If it is not, then that improves the controllable voltage source compensation device outputs current to default output current value；
Under the default output current value, obtain current line front end zero-sequence current and the current line rear end
Zero-sequence current；
If the zero-sequence current of the current line front end and the difference of the zero-sequence current of the current line rear end are greater than
Predetermined current difference then disconnects the breaker of the current line.
Optionally, the default output current value is four times of the output electric current of the controllable voltage source compensation device.
Optionally, the predetermined current difference is two times of the output electric current of the controllable voltage source compensation device.
Optionally, the predesigned compensation time is 1s-3s.
The application second aspect provides positioning and the guarantor of a kind of distributed flexible ground fault based on controllable voltage source
Protection unit, described device include:
Judging unit, for judging whether current system occurs singlephase earth fault；
Determination unit, for if it is, the rule for being zero according to the earth current for obtaining fault point, determines controllable voltage
The output voltage and output electric current of source compensation device；
Detection unit, for after the predesigned compensation time, whether detection singlephase earth fault to be eliminated；
Unit is improved, for if it is not, then that improves the controllable voltage source compensation device outputs current to default output
Current value；
Acquiring unit obtains the zero-sequence current of current line front end and described under the default output current value
The zero-sequence current of current line rear end；
Control unit, if for the zero-sequence current of the current line front end and the zero sequence electricity of the current line rear end
The difference of stream is greater than predetermined current difference, then disconnects the breaker of the current line.
Optionally, the default output current value is four times of the output electric current of the controllable voltage source compensation device.
Optionally, the predetermined current difference is two times of the output electric current of the controllable voltage source compensation device.
Optionally, the predesigned compensation time is 1s-3s., existing to solve the problems, such as.
By the above technology it is found that this application provides a kind of distributed flexible ground fault based on controllable voltage source is determined
Position and guard method, which comprises judge whether current system occurs singlephase earth fault；If it is, according to acquisition
The rule that the earth current of fault point is zero determines the output voltage and output electric current of controllable voltage source compensation device；Default
After compensating the time, whether detection singlephase earth fault is eliminated；If it is not, then improving the controllable voltage source compensation device
Output current to default output current value；Under the default output current value, obtain current line front end zero-sequence current and
The zero-sequence current of the current line rear end；If the zero-sequence current of the current line front end and the current line rear end
The difference of zero-sequence current is greater than predetermined current difference, then disconnects the breaker of the current line.Positioning provided herein
And in guard method, controllable voltage source is connected between system neutral and ground, when single-phase earthing occurs for system, according to reality
It needs controllable voltage source to carry out earth current to ground fault to compensate entirely, if inscribed in the controllable voltage source full compensation regulation time
Earth fault is not eliminated, then by adjusting output electric current, calculates the zero-sequence current difference of route front and back end, and then accurate judgement failure
Position, and start line protective devices tripping ground path.
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 be a kind of distributed flexible ground fault based on controllable voltage source provided by the embodiments of the present application positioning and
The flow chart of guard method；
Fig. 2 is a kind of electric loop of the flexible ground control method based on controllable voltage source provided by the embodiments of the present application
Schematic diagram；
Fig. 3 be a kind of distributed flexible ground fault based on controllable voltage source provided by the embodiments of the present application positioning and
The structural schematic diagram of protective device.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Whole description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 1, being a kind of distributed flexible ground fault based on controllable voltage source provided by the embodiments of the present application
Positioning and guard method flow chart.
The embodiment of the present application provides the positioning and protection of a kind of distributed flexible ground fault based on controllable voltage source
Method, which comprises
Step 101 judges whether current system occurs singlephase earth fault；
Step 102, if it is, according to obtain fault point earth current be zero rule, determine controllable voltage source mend
Repay the output voltage and output electric current of device；
Step 103, after the predesigned compensation time, detection singlephase earth fault whether be eliminated；
Step 104, if it is not, then that improves the controllable voltage source compensation device outputs current to default output electric current
Value；
Step 105, under the default output current value, obtain the zero-sequence current of current line front end and described work as front
The zero-sequence current of road rear end；
If the zero-sequence current of step 106, the zero-sequence current of the current line front end and the current line rear end
Difference is greater than predetermined current difference, then disconnects the breaker of the current line.
In positioning and guard method provided herein, controllable voltage source is connected between system neutral and ground, when
When single-phase earthing occurs for system, controllable voltage source compensates ground fault progress earth current entirely according to actual needs, if
Ground fault is not eliminated in the controllable voltage source full compensation regulation time, then by adjusting output electric current, calculates route front and back end
Zero-sequence current difference, and then accurate judgement abort situation, and start line protective devices tripping ground path.
Referring to Fig. 2, being a kind of flexible ground control method based on controllable voltage source provided by the embodiments of the present application
Electric loop schematic diagram.
By illustrating it is found that by taking single-phase earthing occurs for A phase as an example: when there is singlephase earth fault in system, controllable voltage source
Compensation device output voltage U0x, export electric current I0x, so that controllable voltage source compensation device output electric current and generation single-phase earthing event
The difference DELTA I=I of the zero-sequence current of barrier system0-I0x≈ 0 is grounded the full compensating operation of failure.
Wherein, Δ I represents the difference of the zero-sequence current of controllable voltage source compensation device output electric current and ground fault system；
I0Represent the zero-sequence current of system single-phase earth fault；I0xRepresent the output electric current of controllable voltage source compensation device.
When system is after realizing the complete compensated predesigned compensation time, if controllable voltage source compensation device detects ground connection
Failure vanishes, then the device carries out shutdown operation；If device detects that ground fault still remains, controllable voltage source holding can
The output voltage phase invariant of voltage source compensation device is controlled, output voltage amplitude is reduced, until controllable voltage source output electric current reaches
To default output current value.
The zero-sequence current for the route front and back end that intelligent control unit detects can lead to difference because of the influence of ground fault
It is different.It is divided between the intelligent control unit near route rear and front end and mutually communicates, judge the zero-sequence current difference of front and back end
It whether is more than predetermined current difference.For example, the difference of zero-sequence current detected by intelligent control unit 1 and intelligent control unit 2
Value is more than predetermined current difference, then intelligent control unit 1 controls breaker S1 movement, so that ground fault and isolation of system, and
Since the zero-sequence current difference between intelligent control unit 2 and intelligent control unit 3 is less than 2I0x, then without movement.
Further, the default output current value is four times of the output electric current of the controllable voltage source compensation device.
Further, the predetermined current difference is two times of the output electric current of the controllable voltage source compensation device.
Further, the predesigned compensation time is 1s-3s.
Referring to Fig. 3, being a kind of distributed flexible ground fault based on controllable voltage source provided by the embodiments of the present application
Positioning and protective device structural schematic diagram.
The positioning and protective device for the distributed flexible ground fault based on controllable voltage source that this application provides a kind of, institute
Stating device includes:
Judging unit 1, for judging whether current system occurs singlephase earth fault；
Determination unit 2, for if it is, the rule for being zero according to the earth current for obtaining fault point, determines controllable electric
The output voltage and output electric current of potential source compensation device；
Detection unit 3, for after the predesigned compensation time, whether detection singlephase earth fault to be eliminated；
Unit 4 is improved, for if it is not, then that improves the controllable voltage source compensation device outputs current to default output
Current value；
Acquiring unit 5 obtains the zero-sequence current of current line front end and described under the default output current value
The zero-sequence current of current line rear end；
Control unit 6, if for the zero-sequence current of the current line front end and the zero sequence of the current line rear end
The difference of electric current is greater than predetermined current difference, then disconnects the breaker of the current line.
Further, the default output current value is four times of the output electric current of the controllable voltage source compensation device.
Further, the predetermined current difference is two times of the output electric current of the controllable voltage source compensation device.
Further, the predesigned compensation time is 1s-3s.
From the above technical scheme, the embodiment of the present application provides a kind of distributed flexible based on controllable voltage source and connects
The positioning and guard method of earth fault, which comprises judge whether current system occurs singlephase earth fault；If so,
The rule for being then zero according to the earth current for obtaining fault point determines the output voltage and output electricity of controllable voltage source compensation device
Stream；After the predesigned compensation time, whether detection singlephase earth fault is eliminated；If it is not, then improving the controllable voltage source
Compensation device outputs current to default output current value；Under the default output current value, current line front end is obtained
The zero-sequence current of zero-sequence current and the current line rear end；If the zero-sequence current of the current line front end and described current
The difference of the zero-sequence current of back end of line is greater than predetermined current difference, then disconnects the breaker of the current line.The application institute
In the positioning and guard method of offer, controllable voltage source is connected between system neutral and ground, when single-phase earthing occurs for system
When, controllable voltage source compensates ground fault progress earth current entirely according to actual needs, if compensated entirely in controllable voltage source
Ground fault is not eliminated in stipulated time, then by adjusting output electric current, calculates the zero-sequence current difference of route front and back end, in turn
Accurate judgement abort situation, and start line protective devices tripping ground path.
It is worth noting that, in the specific implementation, the present invention also provides a kind of computer storage mediums, wherein the computer
Storage medium can be stored with program, which may include the service providing method or use of user identity provided by the invention when executing
Step some or all of in each embodiment of family register method.The storage medium can be magnetic disk, CD, read-only storage note
Recall body (English: read-only memory, abbreviation: ROM) or random access memory (English: random access
Memory, referred to as: RAM) etc..
It is required that those skilled in the art can be understood that the technology in the embodiment of the present invention can add by software
The mode of general hardware platform realize.Based on this understanding, the technical solution in the embodiment of the present invention substantially or
Say that the part that contributes to existing technology can be embodied in the form of software products, which can deposit
Storage is in storage medium, such as ROM/RAM, magnetic disk, CD, including some instructions are used so that computer equipment (can be with
It is personal computer, server or the network equipment etc.) execute certain part institutes of each embodiment of the present invention or embodiment
The method stated.
Those skilled in the art after considering the specification and implementing the invention disclosed here, will readily occur to of the invention its
Its embodiment.This application is intended to cover any variations, uses, or adaptations of the invention, these modifications, purposes or
Person's adaptive change follows general principle of the invention and including the undocumented common knowledge in the art of the present invention
Or conventional techniques.The description and examples are only to be considered as illustrative, and true scope and spirit of the invention 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 (8)
1. a kind of positioning and guard method of the distributed flexible ground fault based on controllable voltage source, which is characterized in that described
Method includes:
Judge whether current system occurs singlephase earth fault；
If it is, the rule for being zero according to the earth current for obtaining fault point, determines the output of controllable voltage source compensation device
Voltage and output electric current；
After the predesigned compensation time, whether detection singlephase earth fault is eliminated；
If it is not, then that improves the controllable voltage source compensation device outputs current to default output current value；
Under the default output current value, the zero-sequence current of current line front end and the zero sequence of the current line rear end are obtained
Electric current；
If the difference of the zero-sequence current of the current line front end and the zero-sequence current of the current line rear end is greater than default
Current differential then disconnects the breaker of the current line.
2. the method according to claim 1, wherein the default output current value is controllable voltage source benefit
Four times for repaying the output electric current of device.
3. the method according to claim 1, wherein the predetermined current difference is controllable voltage source compensation
Two times of the output electric current of device.
4. the method according to claim 1, wherein the predesigned compensation time is 1s-3s.
5. a kind of positioning and protective device of the distributed flexible ground fault based on controllable voltage source, which is characterized in that described
Device includes:
Judging unit, for judging whether current system occurs singlephase earth fault；
Determination unit, for if it is, the rule for being zero according to the earth current for obtaining fault point, determines that controllable voltage source is mended
Repay the output voltage and output electric current of device；
Detection unit, for after the predesigned compensation time, whether detection singlephase earth fault to be eliminated；
Unit is improved, for if it is not, then improving outputing current to for the controllable voltage source compensation device presets output electric current
Value；
Acquiring unit obtains the zero-sequence current of current line front end and described current under the default output current value
The zero-sequence current of back end of line；
Control unit, if the zero-sequence current of the zero-sequence current and current line rear end for the current line front end
Difference is greater than predetermined current difference, then disconnects the breaker of the current line.
6. device according to claim 5, which is characterized in that the default output current value is controllable voltage source benefit
Four times for repaying the output electric current of device.
7. device according to claim 5, which is characterized in that the predetermined current difference is controllable voltage source compensation
Two times of the output electric current of device.
8. device according to claim 5, which is characterized in that the predesigned compensation time is 1s-3s.
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Cited By (1)
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| WO2023216501A1 (en) * | 2022-05-07 | 2023-11-16 | 云南电网有限责任公司电力科学研究院 | Line protection method for flexible grounding system of power distribution network, and related device |
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