CN109980624A - A kind of full compensation implementation method of controllable current source cooperation preset arc suppression coil - Google Patents
A kind of full compensation implementation method of controllable current source cooperation preset arc suppression coil Download PDFInfo
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- CN109980624A CN109980624A CN201910259756.0A CN201910259756A CN109980624A CN 109980624 A CN109980624 A CN 109980624A CN 201910259756 A CN201910259756 A CN 201910259756A CN 109980624 A CN109980624 A CN 109980624A
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- current source
- electric current
- arc suppression
- suppression coil
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
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Abstract
The embodiment of the present application discloses a kind of full compensation implementation method of controllable current source cooperation preset arc suppression coil, when system operates normally, detection system line voltage；Controllable current source output the first detection electric current, detects the first neutral point voltage and the first arc suppression coil electric current；Controllable current source output the second detection electric current, detects the second neutral point voltage and the second arc suppression coil electric current；The electric current that should be exported when earth current is fully compensated in controllable current source when single-phase earthing occurs for computing system different phases；Judge whether system occurs single-phase earthing；In case of single-phase earthing, Earth Phase is determined；Controllable current source exports the corresponding controllable current source of the ground connection and the electric current that should be exported when earth current is fully compensated.For the embodiment of the present application under the method for operation basis for not changing former arc suppression coil, damping resistance, accurate calculate needed for controllable current source compensates entirely exports electric current, ensure that system operational safety.
Description
Technical field
This application involves the full compensation technique field of network system single-phase earthing more particularly to a kind of cooperation of controllable current source are pre-
The full compensation implementation method of mode arc suppression coil.
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.
When system capacitive current is more than certain numerical value, ground arc when singlephase earth fault occurs is unable to self-extinguish, generates arc light
Overvoltage and other secondary harms.Low and medium voltage distribution network generallys use small current neutral grounding mode, including isolated neutral mode
Or neutral by arc extinction coil grounding mode.Isolated neutral run when, ground arc can not self-extinguish, personnel safety and
Operational safety can not ensure.Under neutral by arc extinction coil grounding mode, idle electricity of the ground arc due to arc suppression coil compensation
Stream effect, partially can self-extinguish, but arc suppression coil is only capable of compensating reactive power electric current, and there are still ground connection residual flows after compensation.Residual flow packet
Containing certain overcompensation induced current and watt current, there are still personnel's electric shock and lead to the risks such as fire.By to earth current
Full compensation can achieve the purpose that extinguish electric arc completely and prevent Danger Electric shock risk, therefore zero current compensation method is a kind of reliable
The singlephase earth fault governing measure of safety.When the capacitance current of system is larger, single be fully compensated with controllable current source is grounded
Electric current, power supply capacity are larger, it is difficult to realize.To solve this problem, it arc suppression coil can be compensated entirely with controllable current source
Improve economy.But the damping resistance of preset arc suppression coil can exit under ground state, and different system modes is presented, makes
The compensation electric current for obtaining controllable current source is difficult to calculate.In engineer application, to avoid this problem, the resistance of arc suppression coil can be generally removed
Buffer resistance, but will cause that system unbalance voltage is excessively high, and there are biggish operation risks.
So how accurately to determine the compensation electric current of controllable current source, and operation risk is not will cause as this field
Technical staff's urgent problem to be solved.
Summary of the invention
This application provides a kind of full compensation implementation methods of controllable current source cooperation preset arc suppression coil, existing to solve
There is the compensation electric current that controllable current source cannot be accurately determined in technology, and, it cannot be guaranteed that the problem of operational safety.
The application provides a kind of full compensation implementation method of controllable current source cooperation preset arc suppression coil, the method packet
It includes:
When system operates normally, detection system line voltage；
Controllable current source output the first detection electric current, detects the first neutral point voltage and the first arc suppression coil electric current；
Controllable current source output the second detection electric current, detects the second neutral point voltage and the second arc suppression coil electric current；
Controllable current source stops the first detection electric current of output and the second detection electric current, the distribution resistance of computing system line-to-ground
It is anti-；
Utilize system line distribution impedance over the ground, computing system unbalance voltage；
Using the system line, single-phase connect mutually occurs for distribution impedance and system unbalance voltage, computing system difference over the ground
The electric current that should be exported when earth current is fully compensated in controllable current source when ground；
Judge whether system occurs single-phase earthing；
In case of single-phase earthing, Earth Phase is determined；
Controllable current source exports the corresponding controllable current source of the ground connection and the electricity that should be exported when earth current is fully compensated
Stream.
Further, following formula computing system line-to-ground distribution impedance is utilized:
Wherein: ZcFor system distribution impedance over the ground；
IL1For the first arc suppression coil electric current；
IL2For the second arc suppression coil electric current；
I01For controllable current source output the first detection electric current；
I02For controllable current source output the second detection electric current；
R is the concatenated damping resistance of arc suppression coil；
ZLFor arc suppression coil impedance.
Further, following formula computing system unbalance voltage is utilized:
E0=111(R+ZL+Zc)I01(R+ZL)
Wherein: E0For system unbalance voltage；
IL1For the first arc suppression coil electric current；
I01For controllable current source output the first detection electric current；
R is the concatenated damping resistance of arc suppression coil；
ZLFor arc suppression coil impedance；
ZCFor system distribution impedance over the ground.
Further, controllable current source full remuneration connects when single-phase earthing mutually occurs using following formula computing system is different
The electric current that should be exported when earth-current:
Wherein: I0The compensation that earth current should export is fully compensated for ground connection controllable current source is fully compensated when single-phase earthing
Electric current；
K=0+j √ 1/3, k are constant；
UXIt is the line voltage between the two-phase except Earth Phase for system line voltage；
E0For system unbalance voltage；
ZLFor arc suppression coil impedance；
ZCFor system distribution impedance over the ground.
Further, the arc suppression coil respectively controllable current source output first detection electric current and second detection electric current when
Impedance it is identical.
Further, when single-phase earthing occurs for system, damping resistance is by whole short circuits.
Further, first neutral point voltage and the second neutral point voltage are no more than nominal voltage of a system
15%.
Further, the arc suppression coil detects electric current in the first detection electric current of controllable current source output and second respectively
Frequency is identical as system line electric voltage frequency.
Further, arc suppression coil is respectively in the first detection electric current of controllable current source output and the second detection electric current 0.1
Between~1A.
Further, arc suppression coil is respectively in the phase of the first detection electric current of controllable current source output and the second detection electric current
For arbitrary phase.
A kind of full compensation implementation method of controllable current source cooperation preset arc suppression coil provided by the present application, the method
It include: the detection system line voltage when system operates normally；Controllable current source output the first detection electric current, detection first are neutral
Point voltage and the first arc suppression coil electric current；Controllable current source output the second detection electric current, detects the second neutral point voltage and second
Arc suppression coil electric current；Computing system line-to-ground distribution impedance；Using system line distribution impedance over the ground, computing system is not
Balanced voltage；Using the system line, distribution impedance and system unbalance voltage, computing system difference mutually occur single-phase over the ground
The electric current that should be exported when earth current is fully compensated in controllable current source when ground connection.Judge whether system occurs single-phase earthing；If
Single-phase earthing occurs, determines Earth Phase；Ground connection is fully compensated in the corresponding controllable current source of the controllable current source output ground connection
The electric current that should be exported when electric current.The embodiment of the present application is quasi- under the method for operation basis for not changing former arc suppression coil, damping resistance
It really calculates needed for controllable current source compensates entirely and exports electric current, ensure that system operational safety.
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 the full compensation realization side that a kind of controllable current source provided by the embodiments of the present application cooperates preset arc suppression coil
The flow chart of method；
Fig. 2 is application scenarios schematic diagram provided by the embodiments of the present application.
It illustrates:
Wherein 1- controllable current source, 2- voltage sensor, 3- current sensor, 4- computing unit, 5- arc suppression coil, 6- resistance
Buffer resistance, 7- grounding transformer, 8- system distribution capacity over the ground.
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.
Fig. 2 is the application scenario diagram of the embodiment of the present application, and the structure in Fig. 2 includes: controllable current source 1, voltage sensor
2, current sensor 3, computing unit 4, arc suppression coil 5, damping resistance 6, grounding transformer 7 and system distribution capacity 8 over the ground.
As shown in Figure 1, a kind of full compensation implementation method of controllable current source cooperation preset arc suppression coil, the method packet
It includes:
Step S101, when system operates normally, detection system line voltage；
Step S102, the first detection of controllable current source output electric current, detects the first neutral point voltage and the first arc suppression coil
Electric current；
Step S103, the second detection of controllable current source output electric current, detects the second neutral point voltage and the second arc suppression coil
Electric current；
Specifically, the second neutral point voltage and the second arc suppression coil electric current be first detection electric current output after, and
Detect neutral point voltage under the first detection function of current, after arc suppression coil electric current, controllable current output the second detection electricity
It is measured when stream.
Step S104, controllable current source stops the first detection electric current of output and the second detection electric current, computing system route pair
Ground distribution impedance；
Step S105, system line distribution impedance over the ground, computing system unbalance voltage are utilized；
Step S106, the system line distribution impedance and system unbalance voltage over the ground, computing system difference phase are utilized
The electric current that should be exported when earth current is fully compensated in controllable current source when single-phase earthing occurs；
Step S107, judge whether system occurs single-phase earthing；
Step S108, in case of single-phase earthing, Earth Phase is determined；
Step S109, it is answered when earth current is fully compensated in the corresponding controllable current source of the controllable current source output ground connection
The electric current of output.
Further, following formula computing system line-to-ground distribution impedance is utilized:
Wherein: ZcFor system distribution impedance over the ground；
IL1For the first arc suppression coil electric current；
IL2For the second arc suppression coil electric current；
I01For controllable current source output the first detection electric current；
I02For controllable current source output the second detection electric current；
R is the concatenated damping resistance of arc suppression coil；
ZLFor arc suppression coil impedance.
Further, following formula computing system unbalance voltage is utilized:
Ea=IL1(R+ZL+Zc)I01(R+ZL)
Wherein: E0For system unbalance voltage；
IL1For the first arc suppression coil electric current；
I01For controllable current source output the first detection electric current；
R is the concatenated damping resistance of arc suppression coil；
ZLFor arc suppression coil impedance；
ZCFor system distribution impedance over the ground.
Further, controllable current source full remuneration connects when single-phase earthing mutually occurs using following formula computing system is different
The electric current that should be exported when earth-current:
Wherein: I0The compensation that earth current should export is fully compensated for ground connection controllable current source is fully compensated when single-phase earthing
Electric current；
K=0+j √ 1/3, k are constant；
UXIt is the line voltage between the two-phase except Earth Phase for system line voltage；
E0For system unbalance voltage；
ZLFor arc suppression coil impedance；
ZCFor system distribution impedance over the ground.
Further, the arc suppression coil respectively controllable current source output first detection electric current and second detection electric current when
Impedance it is identical.
Further, when single-phase earthing occurs for system, damping resistance is by whole short circuits.
Further, first neutral point voltage and the second neutral point voltage are no more than nominal voltage of a system
15%.
Further, the arc suppression coil detects electric current in the first detection electric current of controllable current source output and second respectively
Frequency is identical as system line electric voltage frequency.
Further, arc suppression coil is respectively in the first detection electric current of controllable current source output and the second detection electric current 0.1
Between~1A.
Further, arc suppression coil is respectively in the phase of the first detection electric current of controllable current source output and the second detection electric current
For arbitrary phase.
As seen from the above embodiment, the application proposes that a kind of full compensation of controllable current source cooperation preset arc suppression coil is real
Existing method, under the method for operation basis for not changing former arc suppression coil, damping resistance, the accurate controllable current source that calculates compensates institute entirely
Electric current need to be exported, provides basic calculation for the full compensating project application of earth-fault current of controllable current source.
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 (10)
1. a kind of full compensation implementation method of controllable current source cooperation preset arc suppression coil, which is characterized in that the method packet
It includes:
When system operates normally, detection system line voltage；
Controllable current source output the first detection electric current, detects the first neutral point voltage and the first arc suppression coil electric current；
Controllable current source output the second detection electric current, detects the second neutral point voltage and the second arc suppression coil electric current；
Controllable current source stops the first detection electric current of output and the second detection electric current, computing system line-to-ground distribution impedance；
Utilize system line distribution impedance over the ground, computing system unbalance voltage；
Using the system line distribution impedance and system unbalance voltage over the ground, computing system is different when single-phase earthing mutually occurs
The electric current that should be exported when earth current is fully compensated in controllable current source；
Judge whether system occurs single-phase earthing；
In case of single-phase earthing, Earth Phase is determined；
Controllable current source exports the corresponding controllable current source of the ground connection and the electric current that should be exported when earth current is fully compensated.
2. a kind of full compensation implementation method of controllable current source cooperation preset arc suppression coil according to claim 1,
It is characterized in that, utilizes following formula computing system line-to-ground distribution impedance:
Wherein: ZcFor system distribution impedance over the ground；
IL1For the first arc suppression coil electric current；
IL2For the second arc suppression coil electric current；
I01For controllable current source output the first detection electric current；
I02For controllable current source output the second detection electric current；
R is the concatenated damping resistance of arc suppression coil；
ZLFor arc suppression coil impedance.
3. a kind of full compensation implementation method of controllable current source cooperation preset arc suppression coil according to claim 1,
It is characterized in that, utilizes following formula computing system unbalance voltage:
E0=IL1(R+ZL+ZC)-I01(R+ZL)
Wherein: E0For system unbalance voltage；
IL1For the first arc suppression coil electric current；
I01For controllable current source output the first detection electric current；
R is the concatenated damping resistance of arc suppression coil；
ZLFor arc suppression coil impedance；
ZCFor system distribution impedance over the ground.
4. a kind of full compensation implementation method of controllable current source cooperation preset arc suppression coil according to claim 1,
It is characterized in that, when earth current is fully compensated in controllable current source when single-phase earthing mutually occurs using following formula computing system is different
The electric current that should be exported:
Wherein: I0The compensation electric current that earth current should export is fully compensated for ground connection controllable current source is fully compensated when single-phase earthing；
K=0+j √ 1/3, k are constant；
UXIt is the line voltage between the two-phase except Earth Phase for system line voltage；
E0For system unbalance voltage；
ZLFor arc suppression coil impedance；
ZCFor system distribution impedance over the ground.
5. a kind of full compensation implementation method of controllable current source cooperation preset arc suppression coil according to claim 1,
Be characterized in that, the arc suppression coil respectively controllable current source output first detection electric current and second detection electric current when impedance phase
Together.
6. a kind of full compensation implementation method of controllable current source cooperation preset arc suppression coil according to claim 1,
It is characterized in that, when single-phase earthing occurs for system, damping resistance is by whole short circuits.
7. a kind of full compensation implementation method of controllable current source cooperation preset arc suppression coil according to claim 1,
It is characterized in that, first neutral point voltage and the second neutral point voltage are no more than the 15% of nominal voltage of a system.
8. a kind of full compensation implementation method of controllable current source cooperation preset arc suppression coil according to claim 1,
Be characterized in that, the arc suppression coil respectively controllable current source output first detection electric current and second detection electric current frequency be
Line voltage frequency of uniting is identical.
9. a kind of full compensation implementation method of controllable current source cooperation preset arc suppression coil according to claim 1,
It is characterized in that, arc suppression coil is respectively in the first detection electric current of controllable current source output and the second detection electric current between 0.1~1A.
10. a kind of full compensation implementation method of controllable current source cooperation preset arc suppression coil according to claim 1,
It is characterized in that, arc suppression coil is respectively any phase in the phase of the first detection electric current of controllable current source output and the second detection electric current
Position.
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