CN109541382A - Single-phase earth fault current flexible control method and device based on controllable voltage source - Google Patents
Single-phase earth fault current flexible control method and device based on controllable voltage source Download PDFInfo
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/28—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for meshed systems
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Abstract
This application provides a kind of single-phase earth fault current flexible control method and device based on controllable voltage source, wherein the described method includes: judging whether current system occurs singlephase earth fault；If it is, determining single-phase distribution impedance over the ground, the neutral point voltage of the current system and the output electric current of controllable voltage source of the current system；According to the single-phase distribution impedance over the ground, the neutral point voltage of the current system and the output electric current of the controllable voltage source of the current system, the current in the fault point of the current system is calculated；According to the current in the fault point, the output voltage of the controllable voltage source of the current system is adjusted, the output voltage includes: amplitude and phase.Control method implementation method provided by the present application is simple, can flexible control earth-fault current, it is smaller to the percussion of system, by method provided herein, be capable of the processing mode of flexible configuration system single-phase earth fault.
Description
Technical field
This application involves power network neutral point grounding technology fields more particularly to a kind of single-phase based on controllable voltage source to connect
Earth fault electric current flexible control method and device.
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.
For singlephase earth fault is isolated, distribution system amplifies earth fault electric current frequently with Neutral Point Through Low Resistance mode, into
And pass through line protective devices, tripping ground path.But under Neutral Point Through Low Resistance mode, fault current reaches hundreds of peaces
Training, it is larger to the impact of system；And when high resistance ground occurs, since fault current is greatly reduced compared with metallic earthing, no
It is sufficiently great to initiate route zero-sequenceprotection, often failure is caused further to develop, bigger harm is brought to network system.
Summary of the invention
This application provides a kind of single-phase earth fault current flexible control method and device based on controllable voltage source, with
By adjusting the output voltage of controllable voltage source, it is grounded the flexible control of fault current, to realize flexile list
Phase ground fault processing mode.
The application first aspect provides a kind of single-phase earth fault current flexible control method based on controllable voltage source,
The described method includes:
Judge whether current system occurs singlephase earth fault；
If it is, determining the neutral point voltage of the single-phase distribution impedance over the ground of the current system, the current system
With the output electric current of controllable voltage source；
According to the single-phase distribution impedance over the ground of the current system, the neutral point voltage of the current system and described controllable
The output electric current of voltage source, calculates the current in the fault point of the current system；
According to the current in the fault point, the output voltage of the controllable voltage source of the current system, the output electricity are adjusted
Pressure includes: amplitude and phase.
Optionally, the current in the fault point of current system is calculated according to the following formula,
Wherein, IgRepresenting fault point electric current,The output electric current of controllable voltage source is represented,It represents in current system
Property point voltage, ZdRepresent the single-phase distribution impedance over the ground of current system.
Optionally, the amplitude of the output voltage of the controllable voltage source is in 0-UPBetween, wherein UPSystem is represented not occur
Phase voltage when singlephase earth fault.
Optionally, the phase angle of the output voltage of the controllable voltage source is in ∠ UP+120°-∠UP+ 240 °, wherein ∠ UPGeneration
The phase angle of phase voltage when singlephase earth fault does not occur for table system.
Optionally, the method also includes:
According to the following formula, the full offset voltage amplitude U of the controllable voltage source is calculatedcomAnd voltage phase angle
Wherein, Z0Represent the internal impedance of controllable voltage source, ZdThe single-phase distribution impedance over the ground of current system is represented,It represents
The phase voltage of Earth Phase when singlephase earth fault does not occur for system；
When calculating the current system generation singlephase earth fault according to the following formula, the output voltage of the controllable voltage source,
Wherein,Represent the output voltage of controllable voltage source.
The application second aspect provides a kind of single-phase earth fault current flexible control device based on controllable voltage source,
Described device includes:
Judging unit, for judging whether current system occurs singlephase earth fault；
Determination unit, for if it is, determining single-phase distribution impedance over the ground, the current system of the current system
Neutral point voltage and controllable voltage source output electric current；
First computing unit, for according in the single-phase distribution impedance over the ground of the current system, the current system
The output electric current of property point voltage and the controllable voltage source, calculates the current in the fault point of the current system；
Unit is adjusted, for adjusting the output electricity of the controllable voltage source of the current system according to the current in the fault point
Pressure, the output voltage includes: amplitude and phase.
Optionally, the current in the fault point of current system is calculated according to the following formula,
Wherein, IgRepresenting fault point electric current,The output electric current of controllable voltage source is represented,It represents in current system
Property point voltage, ZdRepresent the single-phase distribution impedance over the ground of current system.
Optionally, the amplitude of the output voltage of the controllable voltage source is in 0-UPBetween, wherein UPSystem is represented not occur
Phase voltage when singlephase earth fault.
Optionally, the phase angle of the output voltage of the controllable voltage source is in ∠ UP+120°-∠UP+ 240 °, wherein ∠ UPGeneration
The phase angle of phase voltage when singlephase earth fault does not occur for table system.
Optionally, described device further include:
Second computing unit, for according to the following formula, calculating the full offset voltage amplitude U of the controllable voltage sourcecomAnd voltage
Phase angle
Wherein, Z0Represent the internal impedance of controllable voltage source, ZdThe single-phase distribution impedance over the ground of current system is represented,It represents
The phase voltage of Earth Phase when singlephase earth fault does not occur for system；
Third computing unit, it is described controllable when singlephase earth fault occurs for calculating the current system according to the following formula
The output voltage of voltage source,
Wherein,Represent the output voltage of controllable voltage source.
By the above technology it is found that this application provides a kind of single-phase earth fault current flexibility control based on controllable voltage source
Method and device processed, wherein the described method includes: judging whether current system occurs singlephase earth fault；If it is, determining
The output electricity of the single-phase distribution impedance over the ground of the current system, the neutral point voltage of the current system and controllable voltage source
Stream；According to the single-phase distribution impedance over the ground of the current system, the neutral point voltage and the controllable voltage of the current system
The output electric current in source, calculates the current in the fault point of the current system；According to the current in the fault point, the current system is adjusted
Controllable voltage source output voltage, the output voltage includes: amplitude and phase.Control method embodiment party provided by the present application
Method is simple, can flexible control earth-fault current, it is smaller to the percussion of system, by method provided herein,
It is capable of the processing mode of flexible configuration system single-phase earth fault.
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 single-phase earth fault current flexible control side based on controllable voltage source provided by the embodiments of the present application
The flow chart of method；
Fig. 2 is a kind of simplified control circuit schematic diagram provided by the embodiments of the present application；
Fig. 3 is a kind of single-phase earth fault current flexible control dress based on controllable voltage source provided by the embodiments of the present application
The structural schematic diagram set；
Fig. 4 is a kind of structural schematic diagram of output voltage for calculating controllable voltage source provided by the embodiments of the present application.
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, soft for a kind of single-phase earth fault current based on controllable voltage source provided by the embodiments of the present application
The flow chart of property control method.
The embodiment of the present application provides a kind of single-phase earth fault current flexible control method based on controllable voltage source, institute
It states
Method includes:
Step 101 judges whether current system occurs singlephase earth fault；
Step 102, if it is, determining the single-phase distribution impedance over the ground of the current system, in the current system
The output electric current of property point voltage and controllable voltage source；
Step 103, according to the single-phase distribution impedance over the ground of the current system, the neutral point voltage of the current system and
The output electric current of the controllable voltage source, calculates the current in the fault point of the current system；
Step 104, according to the current in the fault point, adjust the output voltage of the controllable voltage source of the current system, institute
Stating output voltage includes: amplitude and phase.
It is a kind of simplified control circuit schematic diagram provided by the embodiments of the present application incorporated by reference to Fig. 2.
As seen from the figure, current system shares n route, wherein the single-phase distribution impedance over the ground of system is Z1、Z2、...Zn,
ZfImpedance ground when singlephase earth fault occurs for certain route A phase, N point is system neutral, and voltage is denoted as thereonU0For
Controllable voltage source, Z0For controllable voltage source internal resistance, Ua、Ub、UcFor three-phase voltage source.
According to formula (1), the neutral point voltage of current system can be obtained,
According to formula (2), the single-phase distribution impedance over the ground of current system is calculated,
Zd=Z1//Z2//...//Zn (2)
According to formula (3), calculating three-phase current is respectively,
Ia=(UN+Ua)/Zd+(UN+Ua)/Zf
Ib=(UN+Ub)/Zd (3)
Ic=(UN+Uc)/Zd
According to formula (4), the current in the fault point of current system is calculated,
Ig=(UN+Ua)/Zf (4)
According to formula (5), the output electric current of the controllable voltage source of current system is calculated,
Ios=Ia+Ib+Ic=3UN/Zd+Ig (5)
It can be obtained by above formula, the formula for calculating the current in the fault point of current system is formula (6),
Wherein, IgRepresenting fault point electric current,The output electric current of controllable voltage source is represented,It represents in current system
Property point voltage, ZdRepresent the single-phase distribution impedance over the ground of current system.
From the above technical scheme, the single-phase earth fault current provided by the embodiments of the present application based on controllable voltage source
Flexible control method, it is smaller to the percussion of system, by method provided herein, can flexible configuration system it is single-phase
The processing mode of ground fault.
Further, the amplitude of the output voltage of the controllable voltage source is in 0-UPBetween, wherein UPSystem is represented not send out
Phase voltage when raw singlephase earth fault.
Further, the phase angle of the output voltage of the controllable voltage source is in ∠ UP+120°-∠UP+ 240 °, wherein ∠ UP
Represent the phase angle that phase voltage when singlephase earth fault does not occur for system.
Further, the method also includes:
According to the following formula, the full offset voltage amplitude U of the controllable voltage source is calculatedcomAnd voltage phase angle
Wherein, Z0Represent the internal impedance of controllable voltage source, ZdThe single-phase distribution impedance over the ground of current system is represented,It represents
The phase voltage of Earth Phase when singlephase earth fault does not occur for system；
When calculating the current system generation singlephase earth fault according to the following formula, the output voltage of the controllable voltage source,
Wherein,Represent the output voltage of controllable voltage source.
Wherein, the phase that Earth Phase when singlephase earth fault does not occur is keptIt is constant, reduce controllable voltage source output
The amplitude of voltage, then controllable voltage source output voltage at this time is denoted asThenWherein, U 'com
< Ucom。
Referring to Fig. 3, soft for a kind of single-phase earth fault current based on controllable voltage source provided by the embodiments of the present application
The structural schematic diagram of property control device.
The embodiment of the present application provides a kind of single-phase earth fault current flexible control device based on controllable voltage source, institute
Stating device includes:
Judging unit 1, for judging whether current system occurs singlephase earth fault；
Determination unit 2, for if it is, determining the single-phase distribution impedance over the ground of the current system, the current system
The neutral point voltage of system and the output electric current of controllable voltage source；
First computing unit 3, for according in the single-phase distribution impedance over the ground of the current system, the current system
The output electric current of property point voltage and the controllable voltage source, calculates the current in the fault point of the current system；
Unit 4 is adjusted, for adjusting the output electricity of the controllable voltage source of the current system according to the current in the fault point
Pressure, the output voltage includes: amplitude and phase.
Optionally, the current in the fault point of current system is calculated according to the following formula,
Wherein, IgRepresenting fault point electric current,The output electric current of controllable voltage source is represented,It represents in current system
Property point voltage, ZdRepresent the single-phase distribution impedance over the ground of current system.
Optionally, the amplitude of the output voltage of the controllable voltage source is in 0-UPBetween, wherein UPSystem is represented not occur
Phase voltage when singlephase earth fault.
Optionally, the phase angle of the output voltage of the controllable voltage source is in ∠ UP+120°-∠UP+ 240 °, wherein ∠ UPGeneration
The phase angle of phase voltage when singlephase earth fault does not occur for table system.
Referring to Fig. 4, for a kind of structural representation for the output voltage for calculating controllable voltage source provided by the embodiments of the present application
Figure.
Described device further include:
Second computing unit 5, for according to the following formula, calculating the full offset voltage amplitude U of the controllable voltage sourcecomAnd electricity
Press phase angle
Wherein, Z0Represent the internal impedance of controllable voltage source, ZdThe single-phase distribution impedance over the ground of current system is represented,It represents
The phase voltage of Earth Phase when singlephase earth fault does not occur for system；
Third computing unit 6, it is described controllable when singlephase earth fault occurs for calculating the current system according to the following formula
The output voltage of voltage source,
Wherein,Represent the output voltage of controllable voltage source.
By the above technology it is found that this application provides a kind of single-phase earth fault current flexibility control based on controllable voltage source
Method and device processed, wherein the described method includes: judging whether current system occurs singlephase earth fault；If it is, determining
The output electricity of the single-phase distribution impedance over the ground of the current system, the neutral point voltage of the current system and controllable voltage source
Stream；According to the single-phase distribution impedance over the ground of the current system, the neutral point voltage and the controllable voltage of the current system
The output electric current in source, calculates the current in the fault point of the current system；According to the current in the fault point, the current system is adjusted
Controllable voltage source output voltage, the output voltage includes: amplitude and phase.Control method embodiment party provided by the present application
Method is simple, can flexible control earth-fault current, it is smaller to the percussion of system, by method provided herein,
It is capable of the processing mode of flexible configuration system single-phase earth fault.
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 (10)
1. a kind of single-phase earth fault current flexible control method based on controllable voltage source, which is characterized in that the method packet
It includes:
Judge whether current system occurs singlephase earth fault；
If it is, determine the single-phase distribution impedance over the ground of the current system, the current system neutral point voltage and can
Control the output electric current of voltage source；
According to the single-phase distribution impedance over the ground of the current system, the neutral point voltage and the controllable voltage of the current system
The output electric current in source, calculates the current in the fault point of the current system；
According to the current in the fault point, the output voltage of the controllable voltage source of the current system, the output voltage packet are adjusted
It includes: amplitude and phase.
2. the method according to claim 1, wherein according to the following formula calculate current system current in the fault point,
Wherein, IgRepresenting fault point electric current,The output electric current of controllable voltage source is represented,Represent the neutral point electricity of current system
Pressure, ZdRepresent the single-phase distribution impedance over the ground of current system.
3. the method according to claim 1, wherein the amplitude of the output voltage of the controllable voltage source is in 0-UP
Between, wherein UPRepresent phase voltage when singlephase earth fault does not occur for system.
4. the method according to claim 1, wherein the phase angle of the output voltage of the controllable voltage source is in ∠ UP+
120°-∠UP+ 240 °, wherein ∠ UPRepresent the phase angle that phase voltage when singlephase earth fault does not occur for system.
5. the method according to claim 1, wherein the method also includes:
According to the following formula, the full offset voltage amplitude U of the controllable voltage source is calculatedcomAnd voltage phase angle
Wherein, Z0Represent the internal impedance of controllable voltage source, ZdThe single-phase distribution impedance over the ground of current system is represented,Represent system
The phase voltage of Earth Phase when singlephase earth fault does not occur；
When calculating the current system generation singlephase earth fault according to the following formula, the output voltage of the controllable voltage source,
Wherein,Represent the output voltage of controllable voltage source.
6. a kind of single-phase earth fault current flexible control device based on controllable voltage source, which is characterized in that described device packet
It includes:
Judging unit, for judging whether current system occurs singlephase earth fault；
Determination unit, for if it is, determining the single-phase distribution impedance over the ground of the current system, in the current system
The output electric current of property point voltage and controllable voltage source；
First computing unit, for the neutral point according to the single-phase distribution impedance over the ground of the current system, the current system
The output electric current of voltage and the controllable voltage source, calculates the current in the fault point of the current system；
Unit is adjusted, for adjusting the output voltage of the controllable voltage source of the current system, institute according to the current in the fault point
Stating output voltage includes: amplitude and phase.
7. device according to claim 5, which is characterized in that the current in the fault point of current system is calculated according to the following formula,
Wherein, IgRepresenting fault point electric current,The output electric current of controllable voltage source is represented,Represent the neutral point electricity of current system
Pressure, ZdRepresent the single-phase distribution impedance over the ground of current system.
8. device according to claim 5, which is characterized in that the amplitude of the output voltage of the controllable voltage source is in 0-UP
Between, wherein UPRepresent phase voltage when singlephase earth fault does not occur for system.
9. device according to claim 5, which is characterized in that the phase angle of the output voltage of the controllable voltage source is in ∠ UP+
120°-∠UP+ 240 °, wherein ∠ UPRepresent the phase angle that phase voltage when singlephase earth fault does not occur for system.
10. device according to claim 5, which is characterized in that described device further include:
Second computing unit, for according to the following formula, calculating the full offset voltage amplitude U of the controllable voltage sourcecomAnd voltage phase angle
Wherein, Z0Represent the internal impedance of controllable voltage source, ZdThe single-phase distribution impedance over the ground of current system is represented,Represent system
The phase voltage of Earth Phase when singlephase earth fault does not occur；
Third computing unit, when singlephase earth fault occurs for calculating the current system according to the following formula, the controllable voltage
The output voltage in source,
Wherein,Represent the output voltage of controllable voltage source.
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| CN112701658A (en) * | 2020-12-28 | 2021-04-23 | 东南大学 | Composite grounding device based on active inversion voltage regulation and small resistor |
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Application publication date: 20190329 Assignee: Hebei Xuhui Electric Co.,Ltd. Assignor: ELECTRIC POWER RESEARCH INSTITUTE, YUNNAN POWER GRID Co.,Ltd. Contract record no.: X2023980053584 Denomination of invention: Flexible control method and device for single-phase grounding fault current based on controllable voltage source Granted publication date: 20200630 License type: Common License Record date: 20231221 Application publication date: 20190329 Assignee: Changsha Jingke Electric Technology Co.,Ltd. Assignor: ELECTRIC POWER RESEARCH INSTITUTE, YUNNAN POWER GRID Co.,Ltd. Contract record no.: X2023980053583 Denomination of invention: Flexible control method and device for single-phase grounding fault current based on controllable voltage source Granted publication date: 20200630 License type: Common License Record date: 20231221 |
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