CN106356833A - Power distribution network-based control method for grounding failure suppression device - Google Patents
Power distribution network-based control method for grounding failure suppression device Download PDFInfo
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- CN106356833A CN106356833A CN201610892637.5A CN201610892637A CN106356833A CN 106356833 A CN106356833 A CN 106356833A CN 201610892637 A CN201610892637 A CN 201610892637A CN 106356833 A CN106356833 A CN 106356833A
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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
Abstract
The embodiment of the disclosure discloses a power distribution network-based control method for a grounding failure suppression device. The method is used for acquiring an optimal injection current parameter and injecting corresponding injection current into a neutral point of a power distribution network to suppress single-phase grounding failure voltage and failure current. The method of the embodiment of the invention comprises the following steps: determining a phase reference value and an amplitude reference value of corresponding injection current when measured failure phase voltage is minimum, and then injecting the corresponding injection current according to the phase reference value and the amplitude reference value. According to the method, a control process is simplified, and complex detection of multiple parameters is eliminated; the reference values of the injection current are acquired, thereby controlling injection of the corresponding current to realize rapid arc extinction of a grounding failure of the power distribution network.
Description
Technical field
The present invention relates to one-phase earthing failure in electric distribution network extinguishing arc field, more particularly, to a kind of earth fault based on power distribution network
The control method of restraining device.
Background technology
Power distribution network the electricity consumption matter of users as the terminal part of power system, its safe and stable operation direct relation
Amount.But the running environment of power distribution network is complicated and changeable, it is susceptible to all kinds of random faults, wherein singlephase earth fault is in power distribution network
The fault making a very bad impression and occurring most frequently.It is suppression fault current at present, prevent the generation of ground arc, China's power distribution network is more
Ground selects neutral by arc extinction coil grounding mode.
Distribution network failure extinguishing arc typically has neutral by arc extinction coil grounding mode, voltage extinguishing arc method and injection current at present
The methods such as method.Wherein injection current method is a kind of new one-phase earthing failure in electric distribution network suppressing method, and device is connected to distribution
Between net neutral point and the earth, when there is singlephase earth fault, injecting the electric current of an amplitude and specific and phase place to power distribution network, making
With the residual voltage of active approach regulating system, by suppressing fault phase-to-ground voltage to zero, reach suppression singlephase earth fault
Electric current, realize fault extinguishing arc and the purpose of distribution protection.The method can occur moment, failure judgement phase in fault.By inspection
It is measured the parameter over the ground of electrical network thus calculating injection current reference value, by controlling power electric component in flexible ground device
Switch on-off to control its output current, and inject power distribution network and carry out failure restraint.
But this injection current method requires high to the control performance of device, need real-time accurate adjustment injection current
Phase and amplitude.And due to injection current reference value, parameter is related over the ground to power distribution network, not only sufficiently complex, and is difficult to obtain
Take, therefore the control for injection current at present, industry does not also have highly effective method.Therefore how to control injection current,
The rapid arc extinction realizing distribution net work earthing fault is people in the art's technical issues that need to address.
Content of the invention
Embodiments provide a kind of control method of the earth fault restraining device based on power distribution network, simplify control
Process, obtains injection current reference value, by injecting suitable electric current to power network neutral point, controls the zero sequence electricity of distribution system
Pressure and single-phase earth fault current, realize the rapid arc extinction of distribution net work earthing fault.
Embodiments provide a kind of control method of the earth fault restraining device based on power distribution network, comprising:
The reference phase of corresponding injection current and amplitude reference value when determining that the faulted phase voltage of measurement is minimum；
Described injection current is injected according to described reference phase and described amplitude reference value.
Preferably,
The reference phase of corresponding injection current and amplitude reference value when determining that the fault phase-to-ground voltage of measurement is minimum
Specifically include:
Change described injection current phase place, search corresponding described injection current phase place when making faulted phase voltage minimum, fixed
Justice is described reference phase；
Change described injection current amplitude, search corresponding described injection current amplitude when making faulted phase voltage minimum, fixed
Justice is described amplitude reference value.
Further,
Change described injection current phase place, search corresponding described injection current phase place when making faulted phase voltage minimum, fixed
Justice also includes for described reference phase:
Set the first injection current amplitude initial value as power distribution network normally run when capacitive earth current amplitude and set the
One injection current phase place initial value is 90 degree of delayed faulted phase voltage phase place；
Adjust described injection current phase place, relatively the size of described faulted phase voltage, search faulted phase voltage minimum when pair
The described injection current phase place answered, is defined as described reference phase.
Further,
Change described injection current amplitude, search corresponding described injection current amplitude when making faulted phase voltage minimum, fixed
Justice also includes for described amplitude reference value:
Set the second injection current amplitude initial value as described power distribution network normally run when capacitive earth current amplitude and set
Fixed second injection current phase place initial value is described reference phase；
Adjust described injection current amplitude, relatively the size of described faulted phase voltage, search faulted phase voltage minimum when pair
The described injection current amplitude answered, is defined as described amplitude reference value.
Preferably,
Before the reference phase of corresponding injection current and amplitude reference value when determining that the faulted phase voltage of measurement is minimum
Also include:
Measurement power distribution network residual voltage virtual value, if described power distribution network residual voltage virtual value is more than 15% specified phase voltage
When, judge that described power distribution network breaks down；
Relatively each phase-to-ground voltage size, judges that in described each phase-to-ground voltage, voltage low phase is described fault phase.
Embodiments provide a kind of control device of the earth fault restraining device based on power distribution network, comprising:
Computing module, the reference phase of corresponding injection current and width when the faulted phase voltage for determining measurement is minimum
Value reference value；
Injection module, for injecting described injection current according to described reference phase and described amplitude reference value.
Preferably,
Described computing module includes:
Phase calculation submodule, for changing described injection current phase place, searches and makes faulted phase voltage corresponding when minimum
Described injection current phase place, is defined as described reference phase；
Amplitude calculating sub module, for changing described injection current amplitude, searches and makes faulted phase voltage corresponding when minimum
Described injection current amplitude, is defined as described amplitude reference value.
Preferably,
Described control device also includes:
Judge module, for measuring power distribution network residual voltage virtual value, if described power distribution network residual voltage virtual value exceedes
During 15% specified phase voltage, judge that described power distribution network breaks down；
Comparison module, for relatively each phase-to-ground voltage size, judges voltage low phase for described fault phase.
Preferably,
Described phase calculation submodule specifically includes:
First setup unit, for set the first injection current amplitude initial value as power distribution network normally run when direct-to-ground capacitance
Current amplitude and set the first injection current phase place initial value as 90 degree of delayed faulted phase voltage phase place；
First arithmetic element, for adjusting described first injection current phase place, the relatively size of described faulted phase voltage, looks into
Corresponding described first injection current phase place when looking for faulted phase voltage minimum, is defined as described reference phase.
Preferably,
Described amplitude calculating sub module specifically includes:
Second setup unit, for set the second injection current amplitude initial value as described power distribution network normally run when over the ground
Capacitance current amplitude and set the second injection current phase place initial value as described reference phase；
Second arithmetic element, for adjusting described second injection current amplitude, the relatively size of described faulted phase voltage, looks into
Corresponding described second injection current amplitude when looking for faulted phase voltage minimum, is defined as described amplitude reference value.
As can be seen from the above technical solutions, the embodiment of the present invention has the advantage that
The embodiment of the present invention simplifies control process, employs simple and practicability and effectiveness method and obtains injection current ginseng
Examine value, corresponding injection current injected according to the injection current reference phase calculating acquisition and injection current amplitude reference value,
Thus controlling the residual voltage of distribution system, realize the rapid arc extinction of distribution net work earthing fault.Additionally, the embodiment of the present invention need not
Arc suppression coil is frequently transferred the files, it is to avoid the generation of resonance overvoltage, low cost, fast response time, device is passed through with power distribution network
Injection transformer is isolated, and will not bring any impact to system.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, also may be used
So that other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is a kind of showing of the control method of earth fault restraining device based on power distribution network provided in an embodiment of the present invention
It is intended to；
Fig. 2 is the control method of another kind of earth fault restraining device based on power distribution network provided in an embodiment of the present invention
Schematic diagram；
Fig. 3 is to join in a kind of control method based on the earth fault restraining device of power distribution network provided in an embodiment of the present invention
The schematic diagram of electric network single-phase earth fault arc extinction compensation；
Fig. 4 is in another kind of control method based on the earth fault restraining device of power distribution network provided in an embodiment of the present invention
Injection current and the phasor schematic diagram of each phase voltage of power distribution network；
Fig. 5 is the control method of another kind of earth fault restraining device based on power distribution network provided in an embodiment of the present invention
Schematic diagram；
Fig. 6 is a kind of showing of the control device of earth fault restraining device based on power distribution network provided in an embodiment of the present invention
It is intended to；
Fig. 7 is that a kind of control device of earth fault restraining device based on power distribution network provided in an embodiment of the present invention is fallen into a trap
Calculate the schematic diagram of modular constituent；
Fig. 8 is phase in a kind of control device based on the earth fault restraining device of power distribution network provided in an embodiment of the present invention
The schematic diagram of composition and the internal composition of amplitude calculating sub module inside the calculating sub module of position；
Fig. 9 is a kind of control method application of earth fault restraining device based on power distribution network provided in an embodiment of the present invention
The schematic diagram of fault phase-to-ground voltage waveform afterwards.
Wherein, reference is as described below:
501. judge module；502. comparison module；503. computing module；5031. phase calculation submodule；5032. amplitude
Calculating sub module；50311. the first setup unit；50312. the first arithmetic element；50321. the second setup unit；50322. the
Two arithmetic elements；504. injection module.
Specific embodiment
Embodiments provide a kind of control method of the earth fault restraining device based on power distribution network, be used for obtaining
Optimum injection current, and inject power network neutral point, realize the suppression to singlephase earth fault voltage and fault current.
For enabling the goal of the invention of the present invention, feature, advantage more obvious and understandable, below in conjunction with the present invention
Accompanying drawing in embodiment, is clearly and completely described it is clear that disclosed below to the technical scheme in the embodiment of the present invention
Embodiment be only a part of embodiment of the present invention, and not all embodiment.Based on the embodiment in the present invention, this area
All other embodiment that those of ordinary skill is obtained under the premise of not making creative work, broadly falls into present invention protection
Scope.
Embodiments provide a kind of control method of the earth fault restraining device based on power distribution network, as Fig. 1 institute
Show, comprising:
The reference phase of corresponding injection current and amplitude reference value when the 101, determining that the faulted phase voltage of measurement is minimum；
102nd, corresponding injection current is injected according to reference phase and amplitude reference value.
When wherein step 101 determines that the fault phase-to-ground voltage of measurement is minimum the reference phase of corresponding injection current and
Amplitude reference value specifically includes:
1011st, change injection current phase place, search corresponding injection current phase place when making faulted phase voltage minimum, be defined as
Reference phase；
It should be noted that step 1011 is specially fixed amplitude initial value, injection current phase is adjusted for phase step with △ θ
Position value, compares the size of fault phase-to-ground voltage, corresponding injection current phase place when searching faulted phase voltage minimum, is defined as
Optimum injection current phase place, i.e. reference phase.
1012nd, change injection current amplitude, search corresponding injection current amplitude when making faulted phase voltage minimum, be defined as
Amplitude reference value；
It should be noted that it is above-mentioned optimum injection current phase place that step 1012 is specially stationary phase initial value, with △ θ
Adjust injection current amplitude value for amplitude step-length, compare the size of fault phase-to-ground voltage, when searching faulted phase voltage minimum
Corresponding injection current amplitude, is defined as optimum injection current amplitude, i.e. reference phase.
The execution sequence of step 1011 and step 1012 can exchange, and the embodiment after exchange is essentially identical, not
Substantial impact can be caused, here is omitted.
It should be noted that step 102 is specially being noted to power network neutral point according to reference phase and amplitude reference value
Entering corresponding injection current, thus suppressing residual voltage and zero-sequence current, realizing fault extinguishing arc.
Above-mentioned is that each step to the embodiment of the present invention is described in detail, below will be to step 1011 and step
1012 are described in detail, and refer to Fig. 2, another kind of earth fault suppression based on power distribution network provided in an embodiment of the present invention
The control method of device includes:
Step 1011 changes injection current phase place, searches corresponding injection current phase place when making faulted phase voltage minimum, fixed
Justice also includes for reference phase:
2011st, the first injection current amplitude initial value and the first injection current phase place initial value are set；
Capacitive earth current amplitude when first injection current amplitude initial value normally runs for power distribution network；
First injection current phase place initial value is 90 degree of delayed faulted phase voltage phase place；
2012nd, adjust injection current phase place, compare the size of faulted phase voltage, search corresponding during faulted phase voltage minimum
Injection current phase place, is defined as reference phase.
Additionally,
Step 1012 changes injection current amplitude, searches corresponding injection current amplitude when making faulted phase voltage minimum, fixed
Justice also includes for amplitude reference value:
2021st, the second injection current amplitude initial value and the second injection current phase place initial value are set；
Capacitive earth current amplitude when second injection current amplitude initial value normally runs for power distribution network；
Second injection current phase place initial value is reference phase；
2022nd, adjust injection current amplitude, compare the size of faulted phase voltage, search corresponding during faulted phase voltage minimum
Injection current amplitude, is defined as amplitude reference value.
Fig. 3 be using flexible ground device one-phase earthing failure in electric distribution network suppress schematic diagram, flexible ground device with disappear
Arc coil is in parallel, using current control scheme, using pwm active inversion technology, the amplitude of its output current and phase place is controlled
System, its output current is ii.ea、eb、ecRepresent the three phase mains of power distribution network, r0、c0It is respectively each relatively bleeder resistance and electricity
Hold, unFor neutral point voltage；Assume that singlephase earth fault occurs in c phase, fault phase-to-ground voltage (fault piezoelectric voltage) is uc, connect
Ground resistance is rf.
Each relatively admittance is expressed asAnd centering point range writes node current equation and has:
Because three phase mains is symmetric power, therefore ea+eb+ec=0, and un=uc-ec, therefore formula (1) is represented by:
If passing through active inversion device injection current
Then fault phase-to-ground voltage ucClamped down on to zero, fault current is also suppressed, destroyed the condition of arc burning, from
And have effectively achieved fault extinguishing arc.
WillSubstitution formula (3), this formula is represented by:
R in formula0、c0Represent each relatively bleeder resistance and electric capacity respectively, and bleeder resistance admittance is with respect to leakage capacitance electricity
Receive very little, therefore, if only considering leakage capacitance over the ground, 90 degree of injection current delayed phase faulted phase voltage phase place, and inject electricity
Stream amplitude is equal with capacitive earth current amplitude；If considering the impact that bleeder resistance brings, it is actually implanted into current phase event in advance
Barrier phase voltage phase place should be slightly bigger than 90 degree, and amplitude is then slightly larger than actual capacitive earth current amplitude.
Therefore, take injection current phase place initial value θ090 degree of delayed faulted phase voltage phase place, takes injection current amplitude initial value ii0
=ic.
For simplify control process as far as possible, shorten control time, ensure control accuracy, needing to injection current amplitude and phase
The modification scope of position and concrete regulation and control method are further analyzed.
Fig. 4 show the phasor diagram of injection current and each phase voltage of power distribution network, in figure icRepresent capacitive earth current, irTable
Show bleeder resistance electric current over the ground.Due to not only existing leakage capacitance over the ground between circuit and the earth, also exist and reveal electricity over the ground
Resistance, the presence understanding bleeder resistance in conjunction with Fig. 4 and formula (4) can bring certain impact to injection current amplitude and phase place.One
As for, in the power distribution network of 10～35kv grade, bleeder resistance electric current be capacitive earth current 2%～5%, terrible weather bar
Can increase when part or insulation ag(e)ing, but typically not over the 10% of capacitance current.
If maximum capacitor electric current is less than or equal to 150a in general power distribution network (electric pressure 35kv and following), according to Fig. 2, this
When injection current amplitude should be less than being equal toThe phase place of delayed faulted phase voltage should be less than being equal toWithin therefore the modification scope of injection current amplitude being limited to 1a, the regulation and control model of phase place
Enclose within being limited to 6 °.Meanwhile, in order to ensure the accuracy and speed regulating and controlling, the tune of injection current phase place and amplitude can suitably be chosen
Synchronizing long △ θ and △ ii.
Therefore, the step 1011 in the specific embodiments of the control method of the earth fault restraining device based on power distribution network
Can specifically be expressed as:
Choose the initial value θ of injection current phase place0For 90 degree of delayed faulted phase voltage, the initial value i of amplitudei0Equal to capacitance current
ic, adjusting step with △ θ as phase place, comparing injection current phase place value is θx=θ0+x·δθ(θx-θ06 ° of ＜) when fault phase
The size of voltage-to-ground is so that the minimum phase place of this voltage is optimum angle θm, that is, reference phase θm.
Step 1012 in the specific embodiments of the control method of the earth fault restraining device based on power distribution network is permissible
Specifically it is expressed as:
Stationary phase is θm, with △ iiFor the adjusting step of amplitude, comparing injection current amplitude value is iiy=ii0+y·
δii(iiy-ii0＜ 1a) when fault phase-to-ground voltage size so that the minimum amplitude of this voltage is optimum amplitude iin.,
It is exactly amplitude reference value iin.
Above-mentioned is the step 1011 to the embodiment of the present invention and step 1012 is described in detail, and fault will be sentenced below
Disconnected and process control is described in detail, and refers to Fig. 5, another kind of ground connection based on power distribution network provided in an embodiment of the present invention
The control method of failure restraint device includes:
401st, measure power distribution network residual voltage virtual value, if power distribution network residual voltage virtual value is more than 15% specified phase voltage
When, judge that power distribution network breaks down；
402nd, compare each phase-to-ground voltage size, judge that in each phase-to-ground voltage, voltage low phase is fault phase；
The reference phase of corresponding injection current and amplitude reference value when the 403, determining that the faulted phase voltage of measurement is minimum；
404th, corresponding injection current is injected to power network neutral point according to reference phase and amplitude reference value.
Above-mentioned is the breakdown judge to the embodiment of the present invention and process control is described in detail, and enforcement will be somebody's turn to do below
The device of method is described in detail, and refers to Fig. 6, Fig. 7 and Fig. 8, and one kind provided in an embodiment of the present invention is based on power distribution network
Earth fault restraining device control device, comprising:
Judge module 501, for measuring power distribution network residual voltage virtual value, if power distribution network residual voltage virtual value exceedes
During 15% specified phase voltage, judge that power distribution network breaks down；
Comparison module 502, for relatively each phase-to-ground voltage size, judges voltage low phase for fault phase.
Computing module 503, the reference phase of corresponding injection current when the faulted phase voltage for determining measurement is minimum
With amplitude reference value；
Injection module 504, for injecting injection current according to reference phase and amplitude reference value.
Computing module 503 includes:
Phase calculation submodule 5031, for changing injection current phase place, searches and makes faulted phase voltage corresponding when minimum
Injection current phase place, is defined as reference phase；
Amplitude calculating sub module 5032, for changing injection current amplitude, searches and makes faulted phase voltage corresponding when minimum
Injection current amplitude, is defined as amplitude reference value.
Phase calculation submodule 5031 specifically includes:
First setup unit 50311, for set the first injection current amplitude initial value as power distribution network normally run when right
Ground capacitance current amplitude and set the first injection current phase place initial value as 90 degree of delayed faulted phase voltage phase place；
First arithmetic element 50312, for adjusting the first injection current phase place, compares the size of faulted phase voltage, searches
Corresponding first injection current phase place when faulted phase voltage is minimum, is defined as reference phase.
Amplitude calculating sub module 5032 specifically includes:
Second setup unit 50321, for set the second injection current amplitude initial value as power distribution network normally run when right
Ground capacitance current amplitude and set the second injection current phase place initial value as reference phase；
Second arithmetic element 50322, for adjusting the second injection current amplitude, compares the size of faulted phase voltage, searches
Corresponding second injection current amplitude when faulted phase voltage is minimum, is defined as amplitude reference value.
Refer to Fig. 6, judge module 501, comparison module 502, computing module 503, injection module 504 are sequentially connected；
Refer to Fig. 7, computing module 503 comprises phase calculation submodule 5031 and amplitude calculating sub module 5032, and this two
Individual submodule interconnects；
Refer to Fig. 8, the first setup unit 50311 within phase calculation submodule 5031 and the first arithmetic element
50312 connections；The second setup unit 50321 within amplitude calculating sub module 5032 and the second arithmetic element 50322 connect.
Fig. 9 show false voltage waveform under optimum injection current it can be seen that under this fault condition, in 0.1s
Carve injection optimal current, fault point voltage is suppressed to zero from 6425.3v, achieves list using flexible ground device from source
The active extinguishing arc of phase earth fault.
Those skilled in the art can be understood that, for convenience and simplicity of description, the system of foregoing description,
Device and the specific work process of unit, may be referred to the corresponding process in preceding method embodiment, will not be described here.
It should be understood that disclosed system in several embodiments provided herein, apparatus and method are permissible
Realize by another way.For example, device embodiment described above is only schematically, for example, described unit
Divide, only a kind of division of logic function, actual can have other dividing mode when realizing, for example multiple units or assembly
Can in conjunction with or be desirably integrated into another system, or some features can be ignored, or does not execute.Another, shown or
The coupling each other discussing or direct-coupling or communication connection can be by some interfaces, the indirect coupling of device or unit
Close or communicate to connect, can be electrical, mechanical or other forms.
The described unit illustrating as separating component can be or may not be physically separate, show as unit
The part showing can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple
On NE.The mesh to realize this embodiment scheme for some or all of unit therein can be selected according to the actual needs
's.
In addition, can be integrated in a processing unit in each functional unit in each embodiment of the present invention it is also possible to
It is that unit is individually physically present it is also possible to two or more units are integrated in a unit.Above-mentioned integrated list
Unit both can be to be realized in the form of hardware, it would however also be possible to employ the form of SFU software functional unit is realized.
If described integrated unit is realized and as independent production marketing or use using in the form of SFU software functional unit
When, can be stored in a computer read/write memory medium.Based on such understanding, technical scheme is substantially
The part in other words prior art being contributed or all or part of this technical scheme can be in the form of software products
Embody, this computer software product is stored in a storage medium, including some instructions with so that a computer
Equipment (can be personal computer, server, or network equipment etc.) executes the complete of each embodiment methods described of the present invention
Portion or part steps.And aforesaid storage medium includes: u disk, portable hard drive, read only memory (rom, read-only
Memory), random access memory (ram, random access memory), magnetic disc or CD etc. are various can store journey
The medium of sequence code.
The above, above example only in order to technical scheme to be described, is not intended to limit；Although with reference to front
State embodiment the present invention has been described in detail, it will be understood by those within the art that: it still can be to front
State the technical scheme described in each embodiment to modify, or equivalent is carried out to wherein some technical characteristics；And these
Modification or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a kind of control method of the earth fault restraining device based on power distribution network is it is characterised in that include:
The reference phase of corresponding injection current and amplitude reference value when determining that the faulted phase voltage of measurement is minimum；
Described injection current is injected according to described reference phase and described amplitude reference value.
2. control method according to claim 1 is it is characterised in that when determining that the fault phase-to-ground voltage of measurement is minimum pair
The reference phase of the injection current answered and amplitude reference value specifically include:
Change described injection current phase place, search corresponding described injection current phase place when making faulted phase voltage minimum, be defined as
Described reference phase；
Change described injection current amplitude, search corresponding described injection current amplitude when making faulted phase voltage minimum, be defined as
Described amplitude reference value.
3. it is characterised in that changing described injection current phase place, search makes fault to control method according to claim 2
Corresponding described injection current phase place when phase voltage is minimum, is defined as described reference phase and specifically includes:
Set the first injection current amplitude initial value as power distribution network normally run when capacitive earth current amplitude and set the first note
Entering current phase initial value is 90 degree of delayed faulted phase voltage phase place；
Adjust described first injection current phase place, relatively the size of described faulted phase voltage, search faulted phase voltage minimum when pair
The described first injection current phase place answered, is defined as described reference phase.
4. it is characterised in that changing described injection current amplitude, search makes fault to control method according to claim 2
Corresponding described injection current amplitude when phase voltage is minimum, is defined as described amplitude reference value and specifically includes:
Set the second injection current amplitude initial value as described power distribution network normally run when capacitive earth current amplitude and set the
Two injection current phase place initial values are described reference phase；
Adjust described second injection current amplitude, relatively the size of described faulted phase voltage, search faulted phase voltage minimum when pair
The described second injection current amplitude answered, is defined as described amplitude reference value.
5. control method according to claim 1 is it is characterised in that determine that the faulted phase voltage of measurement is corresponding when minimum
Also include before the reference phase of injection current and amplitude reference value:
Measurement power distribution network residual voltage virtual value, if described power distribution network residual voltage virtual value is more than 15% specified phase voltage,
Judge that described power distribution network breaks down；
Relatively each phase-to-ground voltage size, judges that in described each phase-to-ground voltage, voltage low phase is described fault phase.
6. a kind of control device of the earth fault restraining device based on power distribution network is it is characterised in that include:
Computing module, the reference phase of corresponding injection current and amplitude ginseng when the faulted phase voltage for determining measurement is minimum
Examine value；
Injection module, for injecting described injection current according to described reference phase and described amplitude reference value.
7. control device according to claim 6 is it is characterised in that described computing module includes:
Phase calculation submodule, for changing described injection current phase place, searches and makes faulted phase voltage corresponding described when minimum
Injection current phase place, is defined as described reference phase；
Amplitude calculating sub module, for changing described injection current amplitude, searches and makes faulted phase voltage corresponding described when minimum
Injection current amplitude, is defined as described amplitude reference value.
8. control device according to claim 6 is it is characterised in that described control device also includes:
Judge module, for measuring power distribution network residual voltage virtual value, if described power distribution network residual voltage virtual value is more than 15%
During specified phase voltage, judge that described power distribution network breaks down；
Comparison module, for relatively each phase-to-ground voltage size, judges voltage low phase for described fault phase.
9. control device according to claim 7 is it is characterised in that described phase calculation submodule specifically includes:
First setup unit, for set the first injection current amplitude initial value as power distribution network normally run when capacitive earth current
Amplitude and set the first injection current phase place initial value as 90 degree of delayed faulted phase voltage phase place；
First arithmetic element, for adjusting described first injection current phase place, the relatively size of described faulted phase voltage, searches event
Corresponding described first injection current phase place when barrier phase voltage is minimum, is defined as described reference phase.
10. control device according to claim 7 is it is characterised in that described amplitude calculating sub module specifically includes:
Second setup unit, for set the second injection current amplitude initial value as described power distribution network normally run when direct-to-ground capacitance
Current amplitude and set the second injection current phase place initial value as described reference phase；
Second arithmetic element, for adjusting described second injection current amplitude, the relatively size of described faulted phase voltage, searches event
Corresponding described second injection current amplitude when barrier phase voltage is minimum, is defined as described amplitude reference value.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109921402A (en) * | 2019-03-29 | 2019-06-21 | 云南电网有限责任公司电力科学研究院 | A kind of controllable voltage source based on failure phase phase voltage compensates tracking compensation technique entirely |
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| CN109921402A (en) * | 2019-03-29 | 2019-06-21 | 云南电网有限责任公司电力科学研究院 | A kind of controllable voltage source based on failure phase phase voltage compensates tracking compensation technique entirely |
| CN109921403A (en) * | 2019-04-02 | 2019-06-21 | 云南电网有限责任公司电力科学研究院 | A kind of full compensation method of controllable current source ground fault of no inductance compensation |
| CN109980624A (en) * | 2019-04-02 | 2019-07-05 | 云南电网有限责任公司电力科学研究院 | A kind of full compensation implementation method of controllable current source cooperation preset arc suppression coil |
| CN109921403B (en) * | 2019-04-02 | 2020-11-10 | 云南电网有限责任公司电力科学研究院 | Controllable current source earth fault full compensation method without inductance compensation |
| CN109980624B (en) * | 2019-04-02 | 2020-11-17 | 云南电网有限责任公司电力科学研究院 | Full compensation implementation method for matching controllable current source with pre-adjusted arc suppression coil |
| CN110492485A (en) * | 2019-09-18 | 2019-11-22 | 国网湖南省电力有限公司 | Filter resistor branch protection method, system and medium for double tunning alternating current filter |
| CN111276958A (en) * | 2020-01-22 | 2020-06-12 | 福州大学 | Phase-locked loop-based power distribution network single-phase earth fault arc extinction method |
| CN112865059A (en) * | 2020-12-30 | 2021-05-28 | 上海宏力达信息技术股份有限公司 | Method and system suitable for chain type flexible arc extinction measurement control |
| CN112865059B (en) * | 2020-12-30 | 2023-03-14 | 上海宏力达信息技术股份有限公司 | Method and system suitable for chain type flexible arc extinction measurement control |
| CN114285009A (en) * | 2021-12-14 | 2022-04-05 | 国网江苏省电力有限公司常州供电分公司 | Active voltage arc extinction method based on neutral point injection current |
| CN114285009B (en) * | 2021-12-14 | 2023-11-24 | 国网江苏省电力有限公司常州供电分公司 | Active voltage arc extinction method based on neutral point injection current |
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