CN109921403A - A kind of full compensation method of controllable current source ground fault of no inductance compensation - Google Patents
A kind of full compensation method of controllable current source ground fault of no inductance compensation Download PDFInfo
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- CN109921403A CN109921403A CN201910259671.2A CN201910259671A CN109921403A CN 109921403 A CN109921403 A CN 109921403A CN 201910259671 A CN201910259671 A CN 201910259671A CN 109921403 A CN109921403 A CN 109921403A
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Abstract
This application provides a kind of full compensation method of controllable current source ground fault of no inductance compensation, this method includes the three-phase voltage and corresponding single-phase distribution impedance over the ground obtained under distribution network system operates normally；Judge whether distribution network system occurs singlephase earth fault, if singlephase earth fault occurs for distribution network system, it is determined that the Earth Phase of singlephase earth fault occurs；Compensation electric current is calculated according to preset formula according to the phase voltage of corresponding single-phase corresponding distribution impedance and Earth Phase under distribution network system normal operation is grounded；Control controllable current source is exported according to compensation electric current, until single-phase earthing process terminates.Electric current is grounded based on controllable current source to compensate entirely, it is simple with system structure, control is easy, stability is strong, to realize that the full compensating project application of earth-fault current based on controllable current source provides principle calculation method and control method, the full compensation system of controllable current source or device can be developed on the basis of the present invention.
Description
Technical field
This application involves field of power systems more particularly to a kind of controllable current source ground fault of no inductance compensation to mend entirely
Compensation method.
Background technique
China's low and medium voltage distribution network generallys use small current neutral grounding mode, including isolated neutral mode or neutral point warp
Grounding through arc mode.Isolated neutral run when, ground arc can not self-extinguish, personnel safety and operational safety without
Method guarantee.Under neutral by arc extinction coil grounding mode, ground arc is since the reactive current of arc suppression coil compensation acts on, part
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 includes certain overfill
Induced current and watt current are repaid, there are still personnel's electric shock risks.By the full compensation to earth current, it can reach and extinguish electric arc completely
Purpose, therefore zero current compensation method is a kind of reliable safe singlephase earth fault governing measure.Currently, earth current
The research compensated entirely is based on accessing current source realization in neutral point more, and loop structure and method are complicated, it is difficult to practical application.
Summary of the invention
This application provides a kind of full compensation methodes of controllable current source ground fault of no inductance compensation, to solve ground connection electricity
It flows the research compensated entirely to be based on accessing current source realization in neutral point, loop structure and method are complicated, it is difficult to practical application more
The problem of.
This application provides a kind of full compensation method of controllable current source ground fault of no inductance compensation, the method packets
It includes:
Obtain the three-phase voltage and corresponding single-phase distribution impedance over the ground under distribution network system operates normally；
Judge whether the distribution network system occurs singlephase earth fault, if single-phase earthing occurs for the distribution network system
Failure, it is determined that the Earth Phase of singlephase earth fault occurs；
It is normally transported according to the corresponding single-phase corresponding distribution impedance of the ground connection and the Earth Phase in distribution network system
Compensation electric current is calculated according to preset formula in phase voltage under row；
Control controllable current source is exported according to compensation electric current, until single-phase earthing process terminates.
From the above technical scheme, this application provides a kind of controllable current source ground faults of no inductance compensation to mend entirely
Compensation method is grounded electric current based on controllable current source and compensates entirely, has system structure simple, and control is easy, and stability is strong, is
Realize that the full compensating project application of earth-fault current based on controllable current source provides principle calculation method and control method,
The full compensation system of controllable current source or device can be developed on the basis of the present invention.
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 circuit diagram for the full compensation circuit of controllable current source ground fault without inductance compensation that the present invention applies；
Fig. 2 is a kind of process of the full compensation method of controllable current source ground fault of no inductance compensation provided by the present application
Figure.
Specific embodiment
The present processes can be used in circuit shown in FIG. 1, wherein the circuit includes A phase phase power supply Ua, B Xiang Xiang electricity
Source Ub, C phase phase power supply Uc, switch K and controllable voltage source U0, A phase phase power supply Ua, B phase phase power supply Ub and C phase phase power supply Uc are positive
Sequence distribution.
A phase phase power supply Ua and corresponding single-phase distribution impedance Z over the groundCConnection forms A phase phase power branch；B phase phase power supply
Ub and corresponding single-phase distribution impedance Z over the groundCConnection forms B phase phase power branch；C phase phase power supply Uc with it is corresponding single-phase right
Ground distribution impedance ZCConnection forms C phase phase power branch；It is corresponding single-phase in the phase power branch for singlephase earth fault occur
Distribution impedance Z over the groundCUpper earth transition resistance Zd.
A phase phase power branch, B phase phase power branch and C phase phase power branch are connected in parallel, and A phase phase power supply Ua, B phase
The junction of phase power supply Ub, C phase phase power supply Uc forms neutral point N, corresponding single-phase distribution impedance Z over the groundCThe junction of connection
Ground connection；Neutral point N is grounded after concatenating with controllable current source Ik.
Referring to fig. 2, described this application provides a kind of full compensation method of controllable current source ground fault of no inductance compensation
Method includes:
Step 21: obtaining the three-phase voltage and corresponding single-phase distribution impedance over the ground under distribution network system operates normally；
Step 22: judging whether the distribution network system occurs singlephase earth fault, if the distribution network system occurs
Singlephase earth fault thens follow the steps 23.
Step 23: determining the Earth Phase that singlephase earth fault occurs.
Specifically, the corresponding residual voltage value of three-phase phase power supply and bus voltage value are obtained；If the three-phase phase power supply
Corresponding residual voltage value is in the range of preset voltage value, then by the lag of phase where highest phase voltage value in three phase transmission line
Mutually it is determined as Earth Phase.
Step 24: according to the corresponding single-phase corresponding distribution impedance of the ground connection and the Earth Phase in power distribution network system
Compensation electric current is calculated according to preset formula in phase voltage under system operates normally.The reference direction for compensating electric current is from ground
It is directed toward distribution system system neutral direction.
The preset formula is
Wherein, IkTo compensate electric current, ZCTo be grounded corresponding single-phase distribution impedance,It is Earth Phase in distribution network system
Phase voltage under operating normally.
Step 25: control controllable current source is exported according to compensation electric current, until single-phase earthing process terminates.
From the above technical scheme, this application provides a kind of controllable current source ground faults of no inductance compensation to mend entirely
Compensation method is grounded electric current based on controllable current source and compensates entirely, has system structure simple, and control is easy, and stability is strong, is
Realize that the full compensating project application of earth-fault current based on controllable current source provides principle calculation method and control method,
The full compensation system of controllable current source or device can be developed on the basis of the present invention.
Claims (4)
1. a kind of full compensation method of controllable current source ground fault of no inductance compensation, which is characterized in that the described method includes:
Obtain the three-phase voltage and corresponding single-phase distribution impedance over the ground under distribution network system operates normally；
Judge whether the distribution network system occurs singlephase earth fault, if single-phase earthing event occurs for the distribution network system
Barrier, it is determined that the Earth Phase of singlephase earth fault occurs；
According to the corresponding single-phase corresponding distribution impedance of the ground connection and the Earth Phase under distribution network system normal operation
Phase voltage compensation electric current is calculated according to preset formula；
Control controllable current source is exported according to compensation electric current, until single-phase earthing process terminates.
2. the method as described in claim 1, which is characterized in that the preset formula is
Wherein, IkTo compensate electric current, ZCTo be grounded corresponding single-phase distribution impedance,It is normal in distribution network system for Earth Phase
Phase voltage under operation.
3. method according to claim 1 or 2, which is characterized in that the reference direction of the compensation electric current is to match from ground direction
Electric system system neutral direction.
4. the method as described in claim 1, which is characterized in that the determining Earth Phase that singlephase earth fault occurs includes,
Obtain the corresponding residual voltage value of three-phase phase power supply and bus voltage value；
If the corresponding residual voltage value of the three-phase phase power supply in the range of preset voltage value, by three phase transmission line most
The lag of phase is mutually determined as Earth Phase where high phase voltage value.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910259671.2A CN109921403B (en) | 2019-04-02 | 2019-04-02 | Controllable current source earth fault full compensation method without inductance compensation |
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| CN201910259671.2A CN109921403B (en) | 2019-04-02 | 2019-04-02 | Controllable current source earth fault full compensation method without inductance compensation |
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