CN109802368A - A kind of full compensation circuit of controllable voltage source ground fault and method with inductance compensation - Google Patents
A kind of full compensation circuit of controllable voltage source ground fault and method with inductance compensation Download PDFInfo
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- CN109802368A CN109802368A CN201910049945.5A CN201910049945A CN109802368A CN 109802368 A CN109802368 A CN 109802368A CN 201910049945 A CN201910049945 A CN 201910049945A CN 109802368 A CN109802368 A CN 109802368A
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Abstract
This application provides a kind of full compensation circuit of controllable voltage source ground fault and method with inductance compensation, electric current is grounded based on controllable voltage 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 voltage source provides principle calculation method and control method, the full compensation system of controllable voltage 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 voltage source ground fault with inductance compensation to mend entirely
Repay circuit and 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 circuit of controllable voltage source ground fault and method with inductance compensation, to solve
The research that earth current compensates entirely is based on accessing current source realization in neutral point more, and loop structure and method are complicated, it is difficult to real
The problem of border is applied.
In a first aspect, this application provides a kind of full compensation circuit of the ground fault with inductance compensation, including A phase phase power supply
Ua, B phase phase power supply Ub, C phase phase power supply Uc, switch QF and controllable voltage source U0, A phase phase power supply Ua, B phase phase power supply Ub and
C phase phase power supply Uc is positive sequence distribution；
The A phase phase power supply Ua and corresponding three relatively distribution capacity and bleeder resistance Zc connections form A phase phase power supply
Branch；The B phase phase power supply Ub and corresponding three relatively distribution capacity and bleeder resistance Zc connections form B phase phase power supply branch
Road；The C phase phase power supply Uc and corresponding three relatively distribution capacity and bleeder resistance Zc connections form C phase phase power branch；
The corresponding three relatively earths on distribution capacity and bleeder resistance Zc in the phase power branch for singlephase earth fault occur
Transition resistance Zd；
The A phase phase power branch, B phase phase power branch, C phase phase power branch and compensation inductance ZLIt is connected in parallel, and A
The junction of phase phase power supply Ua, B phase phase power supply Ub, C phase phase power supply Uc forms neutral point N, corresponding three relatively distribution capacity
The junction ground connection connected with bleeder resistance Zc；The neutral point N and the switch QF, controllable voltage source U0 and controllable voltage source
The corresponding internal resistance Z0 concatenation of U0, and the corresponding internal resistance Z0 ground connection of the controllable voltage source U0.
Second aspect, this application provides a kind of full compensation methodes of the ground fault with inductance compensation, applied to above-mentioned
The full compensation circuit of ground fault with inductance compensation, which comprises
When singlephase earth fault occurs in distribution system, inductance Z is compensatedLIt compensates partial earthing electric current and determines and occur
The single phase poaer supply of singlephase earth fault
Utilize the corresponding internal resistance Z0 of controllable voltage source U0 in the full compensation circuit of the ground fault with inductance compensation, failure phase
Corresponding three relatively distribution capacity and bleeder resistance Zc, the phase voltage of failure phase and compensation inductance ZL, according to preset formula,
The output voltage of controllable voltage source U0 is calculated；
Control switch QF closure, until single-phase earthing process terminates.
From the above technical scheme, this application provides a kind of, and the controllable voltage source ground fault with inductance compensation is mended entirely
Circuit and method are repaid, electric current is grounded based on controllable voltage source and is compensated entirely, has system structure simple, control is easy, and is stablized
Property it is strong, for realize the full compensating project application of earth-fault current based on controllable voltage source provide principle calculation method and control
Method processed can develop the full compensation system of controllable voltage source or device 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 a kind of circuit of an embodiment of the full compensation circuit of the ground fault with inductance compensation provided by the present application
Figure；
Fig. 2 is a kind of flow chart of the full compensation method of the ground fault with inductance compensation provided by the present application.
Specific embodiment
In a first aspect, this application provides a kind of full compensation circuit of the ground fault with inductance compensation, including A phase phase power supply
Ua, B phase phase power supply Ub, C phase phase power supply Uc, switch QF and controllable voltage source U0, A phase phase power supply Ua, B phase phase power supply Ub and
C phase phase power supply Uc is positive sequence distribution；
The A phase phase power supply Ua and corresponding three relatively distribution capacity and bleeder resistance Zc connections form A phase phase power supply
Branch；The B phase phase power supply Ub and corresponding three relatively distribution capacity and bleeder resistance Zc connections form B phase phase power supply branch
Road；The C phase phase power supply Uc and corresponding three relatively distribution capacity and bleeder resistance Zc connections form C phase phase power branch；
The corresponding three relatively earths on distribution capacity and bleeder resistance Zc in the phase power branch for singlephase earth fault occur
Transition resistance Zd；Singlephase earth fault occurs for A phase as shown in figure 1, then the corresponding three relatively distribution capacity in A phase power branch
With earth transition resistance Zd on bleeder resistance Zc.
The A phase phase power branch, B phase phase power branch, C phase phase power branch and compensation inductance ZL are connected in parallel, and A
The junction of phase phase power supply Ua, B phase phase power supply Ub, C phase phase power supply Uc forms neutral point N, corresponding three relatively distribution capacity
The junction ground connection connected with bleeder resistance Zc；The neutral point N and the switch QF, controllable voltage source U0 and controllable voltage source
The corresponding internal resistance Z0 concatenation of U0, and the corresponding internal resistance Z0 ground connection of the controllable voltage source U0.
Second aspect, referring to fig. 2, this application provides a kind of full compensation method of the ground fault with inductance compensation, applications
In the above-mentioned full compensation circuit of the ground fault with inductance compensation, which comprises
Step 21: when singlephase earth fault occurs in distribution system, compensating inductance ZLCompensate partial earthing electric current simultaneously
Determine the single phase poaer supply 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 corresponding mutually determining by minimum bus voltage value in three phase transmission line
For failure phase, and determine failure phase Ua, Ub or the voltage of Uc.If the bus voltage value of A phase power transmission line is 15Kv, B phase power transmission line
Bus voltage value be 20Kv, the bus voltage value of C phase power transmission line is 22Kv, then it is A phase that singlephase earth fault, which occurs,.
Step 22: utilizing the corresponding internal resistance of controllable voltage source U0 in the full compensation circuit of the ground fault with inductance compensation
Z0, failure corresponding three relatively distribution capacity and bleeder resistance Zc, the phase voltage of failure phase and compensation inductance ZL, according to pre-
If formula, the output voltage of controllable voltage source U0 is calculated.
Specifically, preset formula is
Wherein, Z0 is controllable voltage source internal resistance；Zc is the corresponding three-phase of failure
Distribution capacity and bleeder resistance over the ground,For failure phase phase voltage, Uk is the output voltage of controllable voltage source U0, ZLFor compensation electricity
Sense.
Step 23: control switch QF closure, until single-phase earthing process terminates.
From the above technical scheme, this application provides a kind of, and the controllable voltage source ground fault with inductance compensation is mended entirely
Circuit and method are repaid, electric current is grounded based on controllable voltage source and is compensated entirely, has system structure simple, control is easy, and is stablized
Property it is strong, for realize the full compensating project application of earth-fault current based on controllable voltage source provide principle calculation method and control
Method processed can develop the full compensation system of controllable voltage source or device on the basis of the present invention.
Claims (4)
1. a kind of full compensation circuit of the ground fault with inductance compensation, which is characterized in that including A phase phase power supply Ua, B phase phase power supply
Ub, C phase phase power supply Uc, switch QF and controllable voltage source U0, A phase phase power supply Ua, B phase phase power supply Ub and C phase phase power supply Uc
For positive sequence distribution；
The A phase phase power supply Ua and corresponding three relatively distribution capacity and bleeder resistance Zc connections form A phase phase power supply branch
Road；The B phase phase power supply Ub and corresponding three relatively distribution capacity and bleeder resistance Zc connections form B phase phase power branch；
The C phase phase power supply Uc and corresponding three relatively distribution capacity and bleeder resistance Zc connections form C phase phase power branch；?
There are in the phase power branch of singlephase earth fault corresponding three relatively earth mistakes on distribution capacity and bleeder resistance Zc
Cross resistance Zd；
The A phase phase power branch, B phase phase power branch, C phase phase power branch and compensation inductance ZLIt is connected in parallel, and A phase phase
The junction of power supply Ua, B phase phase power supply Ub, C phase phase power supply Uc forms neutral point N, and corresponding three relatively distribution capacity and let out
The junction of ohmic leakage Zc connection is grounded；The neutral point N and the switch QF, controllable voltage source U0 and U0 pairs of controllable voltage source
The internal resistance Z0 concatenation answered, and the corresponding internal resistance Z0 ground connection of the controllable voltage source U0.
2. a kind of full compensation method of the ground fault with inductance compensation, applied to connecing with inductance compensation described in claim 1
The full compensation circuit of earth fault, which is characterized in that the described method includes:
When singlephase earth fault occurs in distribution system, inductance Z is compensatedLIt compensates partial earthing electric current and determines that generation is single-phase
The single phase poaer supply of ground fault
It is corresponding using the corresponding internal resistance Z0 of controllable voltage source U0 in the full compensation circuit of the ground fault with inductance compensation, failure
Three relatively distribution capacity and bleeder resistance Zc, the phase voltage of failure phase and compensation inductance ZL, according to preset formula, calculate
Obtain the output voltage of controllable voltage source U0；
Control switch QF closure, until single-phase earthing process terminates.
3. the method as described in claim 1, which is characterized in that the preset formula is
Wherein, Z0 is controllable voltage source internal resistance；Zc is that failure corresponding three is relatively divided
Cloth capacitor and bleeder resistance,For failure phase phase voltage, Uk is the output voltage of controllable voltage source U0, ZLTo compensate inductance.
4. method according to claim 2, which is characterized in that the determining single phase poaer supply that singlephase earth fault occursPacket
It 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
Small bus voltage value is corresponding to be mutually determined as failure phase, and determines failure phase Ua, Ub or the voltage of Uc.
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| CN201910049945.5A CN109802368B (en) | 2019-01-18 | 2019-01-18 | Controllable voltage source ground fault full-compensation circuit with inductance compensation and method |
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| CN201910049945.5A CN109802368B (en) | 2019-01-18 | 2019-01-18 | Controllable voltage source ground fault full-compensation circuit with inductance compensation and method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108448562A (en) * | 2018-05-25 | 2018-08-24 | 云南电网有限责任公司电力科学研究院 | A kind of full compensation method of electric current based on singlephase earth fault and system |
| CN109061372A (en) * | 2018-09-26 | 2018-12-21 | 云南电网有限责任公司电力科学研究院 | A kind of controllable voltage source output voltage calculation method that ground fault compensates entirely |
| CN109167345A (en) * | 2018-09-26 | 2019-01-08 | 云南电网有限责任公司电力科学研究院 | A kind of ground fault arc-suppressing method and device based on controllable voltage source |
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- 2019-01-18 CN CN201910049945.5A patent/CN109802368B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108448562A (en) * | 2018-05-25 | 2018-08-24 | 云南电网有限责任公司电力科学研究院 | A kind of full compensation method of electric current based on singlephase earth fault and system |
| CN109061372A (en) * | 2018-09-26 | 2018-12-21 | 云南电网有限责任公司电力科学研究院 | A kind of controllable voltage source output voltage calculation method that ground fault compensates entirely |
| CN109167345A (en) * | 2018-09-26 | 2019-01-08 | 云南电网有限责任公司电力科学研究院 | A kind of ground fault arc-suppressing method and device based on controllable voltage source |
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