CN107658860A - Distribution network system failure restraint method and device, computer-readable storage medium and equipment - Google Patents
Distribution network system failure restraint method and device, computer-readable storage medium and equipment Download PDFInfo
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- CN107658860A CN107658860A CN201710779956.XA CN201710779956A CN107658860A CN 107658860 A CN107658860 A CN 107658860A CN 201710779956 A CN201710779956 A CN 201710779956A CN 107658860 A CN107658860 A CN 107658860A
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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 present invention relates to a kind of distribution network system failure restraint method and device, computer-readable storage medium and equipment, according to signal generator when it is zero that the voltage of first coil is with the phase difference between electric current it is corresponding caused by the frequency of current signal and the initial inductance of arc suppression coil, obtain total ground capacitance, then the failure of system is detected according to residual voltage, accurately the singlephase earth fault of system can be detected, when detecting singlephase earth fault, first arc suppression coil target inductance value is obtained according to total ground capacitance and the rated frequency of main AC network, the angle of flow of controllable silicon is adjusted to the first object angle of flow.In this way, singlephase earth fault can be detected accurately, after the angle of flow adjustment of controllable silicon, the electric current for flowing through second siding ring changes therewith, and then the electric current of first siding ring changes therewith, changes the voltage of direct-to-ground capacitance, realizes that fault overvoltage suppresses, it is ensured that system safety.
Description
Technical field
The present invention relates to field of power system control, more particularly to a kind of distribution network system failure restraint method and device,
Computer-readable storage medium and equipment.
Background technology
With a large amount of uses of cable in the continuous increase and distribution of net capacity, power system capacitance current drastically increases
Add, the generation of singlephase earth fault can have a strong impact on distribution network system stable operation, and excessively electric during generation singlephase earth fault
Pressure often makes fault spread, substantially reduces Operation of Electric Systems reliability and security, electric power netting safe running is constituted a latent danger.
In urban power distribution network, earthing mode of the distribution network system generally use neutral point through arc suppression coil, at present, in order to
The security of power system is improved, suppresses the overvoltage of singlephase earth fault using some fault treating apparatus so as to realizing failure
Suppress, however, can not accurately judge singlephase earth fault, cause system can not timely and accurately suppress failure, failure restraint effect
Fruit is poor, can not ensure the safety of distribution network system, causes distribution network system security relatively low.
The content of the invention
Based on this, it is necessary to for the unsafe problem of distribution network system, there is provided a kind of distribution network system failure restraint side
Method and device, computer-readable storage medium and equipment.
A kind of distribution network system failure restraint method, the distribution network system include main transformer, bus, grounding transformer
And arc suppression coil, the arc suppression coil include first siding ring and second siding ring corresponding with the first siding ring,
The second siding ring includes first coil and the second coil；The main transformer is connected to main AC network and the bus
Between, the bus is connected with the side of the grounding transformer, and the opposite side of the grounding transformer passes through the arc blowout wire
The first siding ring ground connection of circle, the first coil are connected with signal generator, and second coil and controllable silicon in serial connection are described
Bus is also connected with load respectively by each feeder line, and each feeder line is grounded by corresponding direct-to-ground capacitance respectively；
The distribution network system failure restraint method comprises the following steps：
Electric signal corresponding to the distribution network system is obtained, wherein, electric signal includes residual voltage and described two
The voltage and current of the first coil of secondary lateral coil；
The phase difference obtained between the voltage and the electric current of the first coil signal generation when being zero
The frequency of current signal caused by device is corresponding；
According to the frequency of the current signal and the initial inductance of the arc suppression coil, the total right of each feeder line is obtained
Ground electric capacity；
When singlephase earth fault occurs according to the zero sequence voltage detection to the distribution network system, according to it is described it is total over the ground
The rated frequency of electric capacity and the main AC network obtains the second arc suppression coil target inductance value；
The second target angle of flow corresponding with the second arc suppression coil target inductance value is obtained, adjusts the controllable silicon
The angle of flow is to the second target angle of flow.
A kind of distribution network system failure restraint device is also provided, the distribution network system includes main transformer, bus, ground connection
Transformer and arc suppression coil, the arc suppression coil include first siding ring and secondary side corresponding with the first siding ring
Coil, the second siding ring include first coil and the second coil；The main transformer is connected to main AC network and institute
Between stating bus, the bus is connected with the side of the grounding transformer, and the opposite side of the grounding transformer passes through described
The first siding ring ground connection of arc suppression coil, the first coil are connected with signal generator, second coil and controllable silicon string
Connection, the bus are also connected with load respectively by each feeder line, and each feeder line is grounded by corresponding direct-to-ground capacitance respectively；
The distribution network system failure restraint device includes：
Electric signal acquisition module, for obtaining electric signal corresponding to the distribution network system, wherein, electric signal bag
Include the voltage and current of the first coil of residual voltage and the second siding ring；
Frequency acquisition module, it is for obtaining the phase difference between the voltage and the electric current of the first coil
The frequency of current signal caused by signal generator correspondence when zero；
Total ground capacitance acquisition module, for the frequency according to the current signal and the initial electricity of the arc suppression coil
Sense, obtain the total ground capacitance of each feeder line；
Second inductance acquisition module, for according to zero sequence voltage detection to distribution network system occur singlephase earth fault when,
Second arc suppression coil target inductance value is obtained according to total ground capacitance and the rated frequency of main AC network；
Second adjustment module, for obtaining the second target angle of flow corresponding with the second arc suppression coil target inductance value, adjust
The angle of flow of controllable silicon is saved to the second target angle of flow.
A kind of computer-readable storage medium is also provided, is stored thereon with computer program, the computer program is held by processor
The step of above method is realized during row.
A kind of computer equipment is also provided, including memory, processor and is stored on the memory and can be in institute
The computer program run on processor is stated, realizes above-mentioned method described in the computing device during computer program.
Above-mentioned distribution network system failure restraint method and device, first according to signal generator first coil voltage with
The frequency of current signal and the initial inductance of arc suppression coil caused by being corresponded to when phase difference between electric current is zero, obtain each feedback
The total ground capacitance of line, then the failure of system is detected according to residual voltage, can be accurately to the single-phase of distribution network system
Earth fault is detected, when detecting generation singlephase earth fault, according to total ground capacitance and the volume of main AC network
Determine frequency acquisition the first arc suppression coil target inductance value, and obtain first object corresponding with the first arc suppression coil target inductance value
The angle of flow, the angle of flow of controllable silicon is adjusted to the first object angle of flow, realizes the adjustment of the angle of flow of controllable silicon.In this way, can be accurate
Really detection singlephase earth fault, after accurately singlephase earth fault is detected, thyristor operating angle can be adjusted in time, led
After current flow angle adjustment, the electric current for flowing through second siding ring changes therewith, and then the electric current of first siding ring changes therewith, changes feeder line
Direct-to-ground capacitance voltage, realize the suppression of singlephase earth fault overvoltage, eliminate singlephase earth fault, it is ensured that system safety.
Brief description of the drawings
Fig. 1 is the structural representation of the distribution network system of an embodiment；
Fig. 2 be an embodiment distribution network system in arc suppression coil structural representation；
Fig. 3 be an embodiment distribution network system in arc suppression coil structural representation；
Fig. 4 is the flow chart of the distribution network system failure restraint method of an embodiment；
Fig. 5 is the flow chart of the distribution network system failure restraint method of another embodiment；
Fig. 6 be another embodiment distribution network system failure restraint method according to three-phase voltage obtain voltage characteristic parameter
The sub-process figure of the mode of the value of vector；
Fig. 7 is the module diagram of the distribution network system failure restraint device of an embodiment；
Fig. 8 is the module diagram of the distribution network system failure restraint device of another embodiment；
Fig. 9 illustrates for the submodule of vector value acquisition module in the distribution network system failure restraint device of another embodiment
Figure.
Embodiment
As shown in Figure 1, Figure 2 and shown in Fig. 3, there is provided a kind of distribution network system (i.e. arc suppression coil of power distribution network earthed system), bag
Main transformer, bus, grounding transformer and arc suppression coil are included, arc suppression coil includes first siding ring and and first siding ring
Corresponding second siding ring, second siding ring include first coil and the second coil；Main transformer is connected to main AC network
(being used to provide alternating current), the side connection of bus and grounding transformer, the opposite side of grounding transformer passed through between bus
The first siding ring ground connection of arc suppression coil, first coil are connected with signal generator, and the second coil and controllable silicon in serial connection, bus is also
Connected respectively with load by each feeder line, each feeder line is grounded by corresponding direct-to-ground capacitance respectively., can in any one example
Control silicon is bidirectional thyristor, and signal generator is frequency variation signal generator, and caused current signal is frequency conversion current signal.
As shown in Figure 4, there is provided a kind of above-mentioned distribution network system failure restraint method of embodiment, including step S410-
S450：
S410：Obtain electric signal corresponding to distribution network system.
Wherein, electric signal includes the voltage u12 and electric current i12 of the first coil of residual voltage and second siding ring.
The first siding ring connection grounding transformer of arc suppression coil, first coil and the signal generator string of secondary test coil
Connection, signal generator are used to produce current signal, a voltage can be produced at the both ends of first coil, cocurrent overcurrent can be right
The voltage u12 and electric current i12 of first coil are acquired, and are prepared for subsequent step.
S420：Obtain signal generator when phase difference between the voltage and electric current of first coil is zero it is corresponding caused by
The frequency of current signal.
Bus includes three-phase bus, i.e. A phases bus, B phases bus and C phase buses, each bus respectively corresponding to feeder line with
Load connection, the intersection point of above-mentioned three-phase bus is neutral point, specifically, the side connection of neutral point and grounding transformer, ground connection
The other end of transformer is by grounding through arc, so as to which neutral point passes through grounding transformer and grounding through arc.With
Network system normal operation, when not breaking down, the voltage of neutral point is zero, the primary side no current of arc suppression coil, secondary side
First coil series signals generator in coil, signal generator can produce current signal, in the First Line of second siding ring
Voltage, cocurrent overcurrent are produced in circle, the electric current of first siding ring sensing second siding ring can produce an induced-current, extinguishing arc
The first siding ring of coil forms loop by corresponding with the feeder line direct-to-ground capacitance of bus, by monitor first coil voltage and
The phase difference of electric current, when arc suppression coil and direct-to-ground capacitance generation parallel resonance, the phase difference of the voltage and current of first coil
It is zero, i.e., when two potential differences of the voltage and current of first coil are zero, with direct-to-ground capacitance parallel resonance occurs for arc suppression coil, obtains
Take the frequency of current signal caused by now signal generator can be as a follow-up ginseng for obtaining direct-to-ground capacitance corresponding to feeder line
Number.
S430：According to the frequency of current signal and the initial inductance of arc suppression coil, the total ground capacitance of each feeder line is obtained.
When two potential differences of the voltage and current of first coil are zero, the frequency of current signal corresponding to signal generator is obtained
Rate, and according to the initial inductance of now arc suppression coil and the total ground capacitance of each feeder line of the frequency acquisition of current signal.Can be with
Understand, the corresponding direct-to-ground capacitance of each feeder line, total ground capacitance is the summation of direct-to-ground capacitance corresponding to each feeder line difference.Exist
Get the frequency that phase difference of the signal generator between the voltage and electric current of first coil is current signal caused by zero
Afterwards, the total ground capacitance of each feeder line according to the frequency of current signal and the initial inductance of arc suppression coil, can be obtained, for follow-up step
Suddenly prepare.It is appreciated that specifically, it can lead to, it is necessary to obtain the initial inductance of arc suppression coil before total ground capacitance is obtained
The common method for crossing measurement inductance measures to the initial inductance of arc suppression coil, so as to the subsequently calculating to total ground capacitance.
S440：According to zero sequence voltage detection to distribution network system occur singlephase earth fault when, according to total ground capacitance with
And the rated frequency of main AC network obtains the first arc suppression coil target inductance value.
When singlephase earth fault occurs, exception can occur for the electric current of the direct-to-ground capacitance of each feeder line, i.e., each feeder line is over the ground
The voltage of electric capacity occurs abnormal, and because first siding ring is connected by grounding transformer bus, bus is connected with feeder line again, so that
Electric current by adjusting a lateral coil can realize the adjustment of the electric current for the direct-to-ground capacitance for flowing through feeder line, realize the voltage of direct-to-ground capacitance
Adjustment, i.e., by adjusting the size of current of primary side, to eliminate singlephase earth fault.In the present embodiment, adjustment two is passed through
The electric current of secondary lateral coil, the electric current of first siding ring is can adjust, and the adjustment of the electric current of second siding ring can be controllable by changing
The angle of flow of silicon realizes, so as to realize the electric current of second siding ring by adjusting the angle of flow when singlephase earth fault occurs
Adjustment, and then the electric current of first siding ring is adjusted, the adjustment for the size of current for flowing through feeder line is realized, and then adjust single-phase earthing event
The voltage of feeder line during barrier.Specifically, whether singlephase earth fault is occurred by zero sequence voltage detection distribution network system, detects and match somebody with somebody
When singlephase earth fault occurs for network system, the first extinguishing arc is obtained according to total ground capacitance and the rated frequency of main AC network
Coil target inductance value, prepared to obtain the first object angle of flow.
S450：The first object angle of flow corresponding with the first arc suppression coil target inductance value is obtained, adjusts leading for controllable silicon
Current flow angle is to the first object angle of flow.
Because the second coil of second siding ring is in series with controllable silicon, by adjusting the angle of flow of controllable silicon, two are can adjust
The size of current of secondary lateral coil, so as to realize the adjustment to the size of current of first siding ring, and then adjust pair for flowing through feeder line
The size of current of ground electric capacity, eliminate singlephase earth fault.In the present embodiment, after obtaining the first arc suppression coil target inductance value,
The first object angle of flow corresponding with the first arc suppression coil target inductance value can be obtained, that is, when knowing generation singlephase earth fault
The angle of flow after silicon controlled rectifier regulation, adjust the angle of flow of controllable silicon to and the target angle of flow, realize the tune of thyristor operating angle
Whole, after angle of flow adjustment, the electric current for flowing through second siding ring changes therewith, and then the electric current of first siding ring changes therewith, such as
This, realizes the electric current adjustment to first siding ring, suppresses singlephase earth fault.
Above-mentioned distribution network system failure restraint method, first according to signal generator first coil voltage and electric current it
Between phase difference it is corresponding when being zero caused by the frequency of current signal and the initial inductance of arc suppression coil, obtain the total of each feeder line
Direct-to-ground capacitance, then the failure of system is detected according to residual voltage, can be accurately former to the single-phase earthing of distribution network system
Barrier is detected, when detecting generation singlephase earth fault, according to total ground capacitance and the rated frequency of main AC network
The first arc suppression coil target inductance value is obtained, and obtains first object conducting corresponding with the first arc suppression coil target inductance value
Angle, the angle of flow of controllable silicon is adjusted to the first object angle of flow, realizes the adjustment of the angle of flow of controllable silicon.In this way, can accurately it examine
Singlephase earth fault is surveyed, after accurately singlephase earth fault is detected, thyristor operating angle can be adjusted in time, the angle of flow
After adjustment, the electric current for flowing through second siding ring changes therewith, and then the electric current of first siding ring changes therewith, changes pair of feeder line
The voltage of ground electric capacity, the suppression of singlephase earth fault overvoltage is realized, eliminate singlephase earth fault, it is ensured that system safety.
Further, the formula for obtaining the total ground capacitance of each feeder line is：
Wherein, CΣFor total ground capacitance, fmFor the frequency of current signal caused by signal generator correspondence, L is initial electricity
Sense.Due to the summation that total ground capacitance is direct-to-ground capacitance corresponding to each feeder line difference, so as to the formula of above-mentioned acquisition direct-to-ground capacitance
It is represented by：CiFor i-th feeder line, (direct-to-ground capacitance is (it is appreciated that i i.e. corresponding to feeder line i)
For the numbering of feeder line), such as C1For direct-to-ground capacitance corresponding to the 1st article of feeder line (i.e. feeder line 1), n is the bar number of feeder line, for more than zero
Positive integer.
Further, according to total ground capacitance CΣAnd the rated frequency f of main AC network0Obtain the first arc suppression coil mesh
Mark inductance value L1Formula be：
In addition, each feeder line of above-mentioned distribution network system is grounded by corresponding resistance to earth respectively, arc light occurs for system
Voltage suppression can be preferably carried out during earth fault.
In one of the embodiments, the second siding ring of above-mentioned distribution network system also includes tertiary coil, tertiary coil
Series filtering circuit, wherein, filter circuit includes the first inductance l1, the second inductance l2, the first electric capacity c11 and the second electric capacity
C12, one end of tertiary coil are connected with the first inductance l1 one end and the second inductance l2 one end respectively, the first inductance l1's
The other end is connected with the first electric capacity c11 one end, and the second inductance l2 other end is connected with the second electric capacity c12 one end, and the 3rd
The other end of coil is connected with the first electric capacity c11 other end and the second electric capacity c12 other end respectively.Pass through filter circuit
Filtering can be realized to the electric current of secondary side, to eliminate the noise of the electric current of secondary side, improve the accuracy of the electric current of secondary side.
In one of the embodiments, above-mentioned electric signal also includes neutral point displacement voltage.Above-mentioned each feeder line of acquisition
After total ground capacitance, in addition to step：According to the specified frequency of total ground capacitance, neutral point movement voltage and main AC network
Rate obtains the total capacitance electric current (capacitance current sum corresponding to each direct-to-ground capacitance difference) of each direct-to-ground capacitance.
In three-phase four-line system, the vector sum of three-phase current is equal to zero, if accessing an electricity in three-phase and four-line
Current transformer carries out current detecting, and at this moment induced-current is zero.That is distribution network system is in normal operation, and the three of three-phase alternating current
The vector sum of phase voltage is equal to zero, and three-phase alternating current electric equilibrium, the displacement voltage of the neutral point of three-phase alternating current is zero, and event is occurring
During barrier, three-phase alternating current disequilibrium, displacement voltage can be produced in neutral point.Broken down for example, working as distribution network system in Fig. 1
When, such as singlephase earth fault, at this moment through current transformer three-phase current phasor and zero may not be waited, such Current Mutual Inductance
Just there is an induced-current in device secondary coil, the current transformer connect here is referred to as zero sequence current mutual inductor, three-phase current
Phasor and not equal to zero, caused electric current is zero-sequence current, now, corresponding to produce residual voltage.
After the total ground capacitance of each feeder line is obtained, voltage and main friendship can be moved according to total ground capacitance, neutral point
The rated frequency for flowing power network obtains total capacitance electric current, in this way, would know that the capacitance current sum for flowing through each direct-to-ground capacitance, is easy to
Solve the capacitance current situation of direct-to-ground capacitance.
Specifically, the formula of acquisition total capacitance electric current is：
Wherein,For total capacitance electric current,Voltage, f are moved for neutral point0For the rated frequency of main AC network.Due to
Total capacitance electric current is the summation of the capacitance current of direct-to-ground capacitance corresponding to each feeder line difference, so as to above-mentioned acquisition total capacitance electric current
Formula can be expressed as：ICiFor the electric capacity electricity of direct-to-ground capacitance corresponding to i-th feeder line
Stream, for example, IC1For the capacitance current of the 1st article of direct-to-ground capacitance corresponding to feeder line, i.e., capacitance current corresponding to the 1st direct-to-ground capacitance.
In one of the embodiments, electric signal also includes three-phase voltage.
In power distribution network, can transmit three-phase alternating current (for example, three-phase four-wire system, wherein, three-phase is A phases, B phases and C phases,
Wherein, single line is the 4th line, i.e. zero line in three-phase and four-line in addition, is drawn from the neutral point of three-phase electricity), it is intersecting for three
Stream electricity, including three-phase voltage and three-phase current etc., wherein, three-phase voltage includes A phase voltages, B phase voltages and C phase voltages, and three
Phase current includes A phase currents, B phase currents and C phase currents.
Referring to Fig. 5, in the present embodiment, according to zero sequence voltage detection to distribution network system occur singlephase earth fault it
Afterwards, in addition to step：
S460：The value of voltage characteristic parameter vector is obtained according to three-phase voltage.
Singlephase earth fault includes metallic ground failure and lonely light earth fault, and fault type is determined to be further accurate,
Raising system safety, after singlephase earth fault occurs according to zero sequence voltage detection to distribution network system, also needs determination system to be
It is no to happens is that arc grounding failure.Because different voltages take on a different character, for example, between the different voltage of electric voltage frequency
Frequecy characteristic is different, amplitude Characteristics difference etc. between the different voltage of voltage magnitude, according to the three-phase voltage of acquisition, can obtain pair
The value for the voltage characteristic parameter vector answered, subsequently to further determine whether that the lonely light earth fault in singlephase earth fault occurs
Prepare.Voltage characteristic parameter vector is made up of each voltage characteristic parameter, and voltage characteristic parameter can be preset, i.e., set in advance
Surely desired voltage characteristic parameter, it can subsequently be obtained according to three-phase voltage and preset what desired voltage characteristic parameter formed
The value of voltage characteristic parameter vector.
S470：Detected according to preset standard value corresponding to the value of voltage characteristic parameter vector and voltage characteristic parameter vector
When lonely light earth fault occurs to distribution network system, second is obtained according to total ground capacitance and the rated frequency of main AC network
Arc suppression coil target inductance value.
Arc grounding is that certain phase voltage of system passes through arc light and big ground short circuit, and arc grounding failure Producing reason is very
More, total situation is all to work as metal or other conductors close to high-voltage line, and distance reaches arcing distance, then produces electric arc and puts
Electricity, arc grounding is just produced when being unable to automatic distinguishing apart from sufficiently small, electric arc.Generally cause arc grounding over-voltage event
Barrier, when a certain phase in three-phase suddenly because of arc grounding and current potential is zero, then the voltage-to-ground of remaining two-phase is just by line voltage liter
Height arrives phase voltage, produces overvoltage, influences the security of system, and in order to ensure system safety, detection arc grounding failure is that have
It is necessary.
It is previously stored with preset standard value corresponding to above-mentioned voltage characteristic parameter vector, the preset standard value can be previously according to
Lonely light grounding surge during the lonely light earth fault of collection obtains, and represents to occur orphan's light grounding surge during lonely light earth fault
Voltage characteristic parameter vector value, the feature of orphan's light grounding surge when can accurately reflect arc grounding fault ground, then
Distribution can accurately be detected according to preset standard value corresponding to the value of voltage characteristic parameter vector and voltage characteristic parameter vector
Whether net system occurs lonely light earth fault.
Between value preset standard value corresponding with voltage characteristic parameter vector by detecting voltage characteristic parameter vector
Whether relation, detectable distribution network system occur lonely light earth fault, are detecting that distribution network system has occurred and that lonely light ground connection
During failure, it may occur that arc grounding over-voltage, i.e., the direct-to-ground capacitance of each feeder line has larger voltage, because first siding ring passes through
Grounding transformer bus is connected, and bus is connected with feeder line again, so as to flow through feeder line by adjusting the electric current of a lateral coil and can realize
Direct-to-ground capacitance electric current adjustment, realize the adjustment of the voltage of direct-to-ground capacitance, i.e., by adjusting the size of current of primary side, with
Suppress overvoltage, eliminate failure.In the present embodiment, by adjusting the electric current of second siding ring, so as to adjustable primary side line
The electric current of circle, and the adjustment of the electric current of second siding ring can be realized by changing the angle of flow of controllable silicon.In the present embodiment, root
The second arc suppression coil target inductance value is obtained according to total ground capacitance and the rated frequency of main AC network, is turned on for follow-up adjustment
Prepare at angle.
S480：The second target angle of flow corresponding with the second arc suppression coil target inductance value is obtained, adjusts leading for controllable silicon
Current flow angle is to the second target angle of flow.
Because the second coil of second siding ring is in series with controllable silicon, by adjusting the angle of flow of controllable silicon, two are can adjust
The size of current of secondary lateral coil, so as to realize the adjustment to the size of current of first siding ring, and then adjust pair for flowing through feeder line
The size of current of ground electric capacity, the suppression of the voltage of direct-to-ground capacitance over the ground is realized, eliminate arc grounding failure.In the present embodiment,
After second arc suppression coil target inductance value is known, the second target conducting corresponding with the second arc suppression coil target inductance value can be obtained
Angle, that is, know the angle of flow after silicon controlled rectifier regulation, adjust the angle of flow of controllable silicon to the second target angle of flow, realize that controllable silicon is led
The adjustment of current flow angle, after angle of flow adjustment, the electric current for flowing through second siding ring changes therewith, and then the electric current of first siding ring is therewith
Change, in this way, realizing the suppression to the voltage of direct-to-ground capacitance, that is, reduce the voltage of direct-to-ground capacitance, realize to distribution network system
Extinguishing arc acts on.
In this way, after singlephase earth fault is detected, it can accurately detect whether that arc grounding failure occurs, accurately detect
To after arc grounding failure, thyristor operating angle can be adjusted in time, after angle of flow adjustment, flow through the electricity of second siding ring
Stream changes therewith, and then the electric current of first siding ring changes therewith, changes the voltage of the direct-to-ground capacitance of feeder line, realizes arc grounding
The suppression of fault overvoltage, that is, realize the extinguishing arc effect to distribution network system, it is ensured that system safety.
Specifically, when singlephase earth fault occurs according to zero sequence voltage detection to distribution network system, according to total ground capacitance
And the rated frequency of main AC network obtains the second arc suppression coil target inductance value；Obtain and the second arc suppression coil target inductance
The second target angle of flow corresponding to value, after the angle of flow to the second target angle of flow for adjusting controllable silicon, perform above-mentioned according to three
Phase voltage obtains the step of value of voltage characteristic parameter vector.In this way, timely and effectively first the angle of flow of controllable silicon can be adjusted
To the first object angle of flow, to suppress the overvoltage of singlephase earth fault, then it is further carried out judging whether occurring single-phase
The arc grounding failure of earth fault, if so, in order to further ensure that system safety, by the angle of flow of controllable silicon to the second target
The angle of flow.
Further, according to total ground capacitance CΣAnd the rated frequency f of main AC network0Obtain the second arc suppression coil mesh
Mark inductance value L2Formula be：
In one of the embodiments, above-mentioned distribution network system failure restraint method, according to zero sequence voltage detection to distribution
When singlephase earth fault occurs for net system, in addition to step：Each feedback after acquisition generation singlephase earth fault in preset time period
Zero-sequence current corresponding to line difference；According to zero-sequence current corresponding to each feeder line difference, obtain and preset spy corresponding to each feeder line difference
Levy the value of parameter；The value of characteristic parameter is preset according to corresponding to each feeder line difference, fault detect is carried out to each feeder line, determines failure
Circuit.
When singlephase earth fault occurs for feeder line, need to confirm the circuit of single-phase fault occurs, in the present embodiment, by right
The analysis of the situation of zero-sequence current, obtains each feedback corresponding to each feeder line difference after generation singlephase earth fault in preset time period
The value of characteristic parameter is preset corresponding to line difference, further according to the value that characteristic parameter is preset corresponding to each feeder line difference, to each feeder line
Fault detect is carried out, to determine that the faulty line of singlephase earth fault occurs.It is easy to follow-up maintenance personnel to position fault wire rapidly
Road is repaired, and quickly discharges failure, improves system safety.
Further, during above-mentioned determination faulty line, the value that characteristic parameter is preset corresponding to each feeder line difference is obtained
Formula be：
Wherein, AiTo preset the value of characteristic parameter corresponding to i-th feeder line, P is sampling number, and I is zero-sequence current, IijFor
Zero-sequence current during the jth time sampling of i-th feeder line.The above-mentioned value that characteristic parameter is preset according to corresponding to each feeder line difference is right
Each feeder line carries out fault detect, the step of determining faulty line be specially to each feeder line respectively corresponding to preset the value of characteristic parameter
Compared with zero, when the value that characteristic parameter is preset corresponding to feeder line is more than zero, it is faulty line to determine feeder line, will be preset
Feeder line of the value of characteristic parameter more than zero is defined as faulty line.
In one of the embodiments, after determining faulty line, in addition to：
Protective relaying device action is controlled, disconnects faulty line Up Highway UHW and the connection of load.
When singlephase earth fault occurs for feeder line, exception may occur for its corresponding voltage and current, influence whole system
Safe operation, in order to avoid the potential safety hazard that singlephase earth fault is brought, it is determined that after faulty line, control relay protection dress
Action is put, disconnects faulty line Up Highway UHW and the connection of load.
In one of the embodiments, the mode bag of singlephase earth fault occurs according to zero sequence voltage detection distribution network system
Include：Obtain voltage effective value corresponding to residual voltage；When the absolute value of residual voltage is more than the first default residual voltage threshold value
Continuous time be more than the first preset time threshold and voltage effective value be less than or equal to the first default residual voltage threshold value divided by
Value when, determine distribution network system occur singlephase earth fault.
In Alternating Current Power Supply, the voltage for flowing through system is alternating current, wherein, residual voltage is alternating current, in the present embodiment
In, in order to which whether accurate detecting system occurs singlephase earth fault, on the basis of residual voltage, obtaining its corresponding voltage has
Valid value, absolute value and the voltage effective value of residual voltage are analyzed to judge whether that singlephase earth fault occurs, works as residual voltage
Absolute value be more than continuous time of the first default residual voltage threshold value and be more than the first preset time threshold and voltage effective value is small
In or equal to the first default residual voltage threshold value divided byValue when, determine distribution network system occur singlephase earth fault, pass through
Failure determination mode in the present embodiment, effectively and accurately detecting system whether singlephase earth fault can occur.
Specifically, residual voltage u is monitored in real time0, work as satisfaction | u0| ＞ uthWhen (uthFor the first default residual voltage threshold value),
Start timer A, start recording residual voltage u0Absolute value be more than the first default residual voltage threshold value uthContinuous time ta,
In recording process if | u0|≤uth, then taZero.In addition, the voltage effective value U of residual voltage is calculated in real timerms, it calculates public
Formula isWherein, N is uniform sampling points, u in each predetermined period0.kRepresent the zero of k-th of sampled point
The sampled value of sequence voltage.In a specific example, the first preset time threshold can be 5 seconds, work as taDuring ＞ 5ms, andWhen, judge singlephase earth fault occurs.Singlephase earth fault can be realized within 10ms through the above way
Detection.
Referring to Fig. 6, in one of the embodiments, the side of the value of voltage characteristic parameter vector is obtained according to three-phase voltage
Formula includes：
S461：S-transformation is carried out to the A phase voltages in three-phase voltage, obtains S complex matrixs；
Wherein, the row of S complex matrixs corresponding time, the row corresponding voltage frequency of S complex matrixs；
S462：To each element modulus in S complex matrixs, S modular matrixs are obtained；
The row corresponding time of S modular matrixs, the corresponding amplitude of row corresponding voltage frequency of S modular matrixs；
S463：Obtain amplitude standard deviation corresponding to each row difference in S modular matrixs, and the amplitude mark according to corresponding to each row difference
It is accurate poor, obtain standard deviation curve；
S464：Standard deviation the curve points of maximum, maximum and average in predetermined period are obtained, is obtained by very big
The value of voltage characteristic parameter vector corresponding to the A phase voltages that points, maximum and the average of value are formed.
Specifically, the amplitude of the voltage of row reflection at a time in S modular matrixs changes with the change of frequency, S moulds
The amplitude that row in matrix are reflected in the voltage at certain frequency changes with the change of time.To S modular matrixs often go in each member
Element carries out the calculating of amplitude standard deviation, often the corresponding amplitude standard deviation of row, quantity and the S moulds of the amplitude standard deviation finally obtained
The quantity of the row of matrix is identical, then obtains standard deviation curve according to each amplitude standard deviation.Specifically, fitting function pair can be passed through
Each amplitude standard deviation, which is fitted, can obtain standard deviation curve.It is follow-up to carry out voltage characteristic parameter vector for standard deviation curve
The acquisition of value, that is, standard deviation the curve points of maximum, maximum and average in predetermined period are obtained, is obtained by maximum
Points, the value of voltage characteristic parameter vector corresponding to the A phase voltages that form of maximum and average, and above-mentioned voltage characteristic ginseng
Number includes above-mentioned standard difference the curve points of maximum, maximum and average in predetermined period.
In one of the embodiments, according to corresponding to the value of voltage characteristic parameter vector and voltage characteristic parameter vector
The mode that lonely light earth fault occurs for preset standard value detection distribution network system includes：Obtain voltage characteristic corresponding to A phase voltages
Euclidean distance between the value of parameter vector preset standard value corresponding with voltage characteristic parameter vector；Euclid away from
During from more than preset matching threshold value, determine that lonely light earth fault occurs for distribution network system.
As above, orphan's light is grounded when the preset standard value of voltage characteristic parameter vector can accurately reflect arc grounding fault ground
The feature of overvoltage, in this way, passing through the preset standard corresponding with voltage characteristic parameter vector of the value to voltage characteristic parameter vector
Value is matched, to detect whether distribution network system occurs lonely light earth fault, specifically, by calculating corresponding to A phase voltages
Euclidean distance between the value of voltage characteristic parameter vector preset standard value corresponding with voltage characteristic parameter vector, in Europe
In several distance when being more than preset matching threshold value, determine the lonely light earth fault of distribution network system generation.
Further, the formula of above-mentioned Euclidean distance acquisition is：
Wherein, E is Euclidean distance, and q represents voltage characteristic parameter numbering, mqFor q in voltage characteristic parameter vector
The value of individual voltage characteristic parameter, nqFor q-th of voltage characteristic parameter preset standard value in voltage characteristic parameter vector.As E ＞ ε
When, ε is preset matching threshold value, determines that arc grounding failure occurs for distribution network system.
In one of the embodiments, above-mentioned distribution network system failure restraint method, in addition to step：
When according to zero sequence voltage detection to distribution network system arc grounding failure vanishes, adjust the angle of flow of controllable silicon to
Initial turn-on angle.
Suppress the process of failure by above-mentioned extinguishing arc, it is excessively electric when can effectively suppress the arc grounding failure of distribution network system
Pressure, reduce overvoltage, reach extinguishing arc purpose.So as to disappeared according to zero sequence voltage detection to distribution network system arc grounding failure
During mistake, extinguishing arc success is represented, distribution network system arc grounding failure excluded, now, can be by adjusting the angle of flow of controllable silicon
To initial turn-on angle, wherein, initial turn-on angle is corresponding with initial arc suppression coil target inductance value, initial arc suppression coil target inductance
Value determines according to total ground capacitance and rated frequency.
Further, initial arc suppression coil target inductance value L is determined according to total ground capacitance and rated frequency3Formula
For：
In one of the embodiments, according to the mode bag of zero sequence voltage detection distribution network system arc grounding failure vanishes
Include：
The continuous time for being less than the second default residual voltage threshold value when the absolute value of residual voltage is more than the second preset time
During threshold value, distribution network system arc grounding failure vanishes are determined.
In order to which whether accurate detecting system arc grounding failure has eliminated, in the present embodiment, by analysis to zero sequence electricity
The absolute value of pressure is to detect whether arc grounding failure disappears, and specifically, is less than second by the absolute value for analyzing residual voltage
The continuous time of default residual voltage threshold value, if it is more than the second preset time threshold, determine distribution network system arc grounding
Failure vanishes.
Specifically, residual voltage u is monitored in real time0, when meeting u0| ＜ utlWhen (utlFor the second default residual voltage threshold value),
Start timer B, start recording residual voltage u0Absolute value be less than the second default residual voltage threshold value utlContinuous time tb,
In recording process if | u0| ＞ utl, then tbZero.In one specific example, the second preset time threshold can be 40 milliseconds,
Work as tbDuring >=40ms, determine that arc grounding failure vanishes, and arc grounding over-voltage have disappeared.
In one of the embodiments, after the total ground capacitance for obtaining each feeder line, in addition to：Show total ground capacitance.
In one of the embodiments, after determining faulty line, in addition to：Show faulty line.Specifically, fault wire
Number information corresponding to Lu Youqi, faulty line is determined, that is, the number information of faulty line is determined, show the volume of faulty line
Number information, so that attendant checks that failure occurs in which circuit.
In one of the embodiments, adjust the angle of flow of controllable silicon also includes step afterwards to the first object angle of flow：
Overvoltage suppressing level is determined, shows voltage suppression level.
In one of the embodiments, in addition to step：Count feeder line ground connection quantity, display ground connection quantity.It is grounded quantity
The quantity of data and single-phase earthing including arc grounding.
In addition, in above-mentioned distribution network system failure restraint method, common parameter setting, initial parameter, operation ginseng can be carried out
The function such as number, angle reactance setting and route selection parameter setting, while also derived record file and sectional drawing function can be realized.
Above-mentioned distribution network system failure restraint method is illustrated with a specific embodiment below.
As shown in figure 1, the bar number of feeder line has n bars (n selections are 5 in the present embodiment), i.e. feeder line in above-mentioned distribution network system
Including the 1st article of feeder line (i.e. feeder line 1), the 2nd article of feeder line (i.e. feeder line 2) ..., nth bar feeder line (i.e. feeder line n), above-mentioned power distribution network
The quantity of the resistance to earth of system is n, i.e., resistance to earth include the 1st resistance to earth R1, the 2nd resistance to earth R2 ..., n-th pair
Ground resistance Rn, direct-to-ground capacitance include the 1st direct-to-ground capacitance C1(direct-to-ground capacitance corresponding with the 1st article of feeder line), the 2nd direct-to-ground capacitance C2(with
2nd article of direct-to-ground capacitance corresponding to feeder line) ..., the n-th direct-to-ground capacitance Cn(direct-to-ground capacitance corresponding with nth bar feeder line), the 1st article
Feeder line passes through the 1st direct-to-ground capacitance C respectively1And the 1st resistance to earth R1 ground connection, the 2nd article of feeder line pass through the 2nd direct-to-ground capacitance C respectively2
And the 2nd resistance to earth R2 ground connection, nth bar feeder line passes through the n-th direct-to-ground capacitance C respectivelynAnd n-th resistance to earth Rn ground connection.
Wherein, the voltage of system is 110kV (i.e. main AC network provides 110KV voltage), capacity 500MVA, main transformer
Depressor capacity is 40MVA, nominal transformation ratio 10/10.5kV, short-circuit voltage 10.5%, and grounding transformer rated capacity is
The grounding transformer of 0.4MVA, rated voltage 10.5kV, 10kV bus bar side connection, for connecting a side line of arc suppression coil
One end of circle, other end ground connection, the capacitance current of direct-to-ground capacitance corresponding to the difference of 5 outlets (feeder line) of 10Kv bus bar sides
Summation is about 60A, and the load of institute's band of each feed line is from zero load to 8MVA, and arc suppression coil rated capacity is 0.5MVA, volume
It is 10kV to determine voltage class, and control mode is phase control type.During the optional position of failure point of each feed line is included as shown in Figure 1
Point f1 and end f2.
(1) measurement of the summation of direct-to-ground capacitance：When system is in normal operating condition, feeder line bar is accessed by adjusting
Number, changes the size of the summation of direct-to-ground capacitance, carries out the test of multiple total ground capacitance, as a result as shown in table 1.
Table 1
| Feeder line is numbered | Capacitance current actual value/A | Capacitance current measurement value/A | Error/% |
| 1~5 | 60.23 | 59.91 | 0.53 |
| 1~4 | 49.71 | 49.38 | 0.67 |
| 2~5 | 47.39 | 47.07 | 0.69 |
| 1,3~5 | 48.76 | 48.39 | 0.76 |
In table 1, capacitance current actual value is the electricity of direct-to-ground capacitance corresponding to each feeder line difference corresponding to feeder line numbering in table 1
The actual summation of capacitance current, capacitance current measurement value are direct-to-ground capacitance corresponding to each feeder line difference corresponding to feeder line numbering in table 1
Summation.As seen from the results in Table 1, the technical scheme of the present embodiment can realize accurate measurement to the total ground capacitance of system, and it is maximum
Error is about 1%.
(2) Overvoltage suppressing (i.e. arc grounding failure restraint)：Set distribution network system respectively 0.01S, 0.07S,
Intermittent grounding fault occurs for 0.195S, 0.135S, 0.376S and 0.469s, changes position of failure point, observes three at bus
Phase voltage, the overvoltage contrasted after arcing transient overvoltage (i.e. busbar grounding overvoltage) first and follow-up repeatedly arcing are maximum
Amplitude, as a result as shown in table 2.
Table 2
As seen from the results in Table 2, the technical scheme of the present embodiment can effectively suppress the follow-up arcing in intermittent grounding fault
Overvoltage level, cause so as to be not above arcing ground first in the arc overvoltage level of intermittent grounding fault overall process
Transient overvoltage it is horizontal.
(3) failure line selection (determining faulty line).2 feeder lines in distribution network system are set to occur to be grounded with phase simultaneously
Failure, changes position of failure point and fault type, failure line selection result are as shown in table 3.
Table 3
| Faulty line is numbered | Position of failure point | Fault type | Route selection result |
| 1 | Midpoint | Intermittent defect | 1 |
| 2 | End | Intermittent defect | 2 |
| 3,4 | Midpoint, end | Intermittent defect | 3,4 |
| 4,5 | Midpoint, end | Intermittent defect | 4,5 |
| 1 | Midpoint | Metallicity failure | 1 |
| 2 | End | Metallicity failure | 2 |
From the result of table 3, when more feeder lines occur for system occur that single-phase earthing occurs with phase earth fault and unit feeder
During failure, either metallicity failure or intermittent defect can realize exact failure route selection.
In a word, the technical scheme of the present embodiment determines the angle of flow size of required adjustment by arc suppression coil inductance, so as to
The angle of flow of controllable silicon is adjusted, realizes the tracking and compensation to the electric current of direct-to-ground capacitance, suppresses overvoltage.Arc suppression coil electricity is set
Sense, the accurate measurement of total ground capacitance need to be depended on.When arc grounding failure or singlephase earth fault occurs, by setting difference
Target arc suppression coil inductance value, determine the different angles of flow, adjustment controllable silicon realizes failure restraint to the different angles of flow.
In addition, after sending singlephase earth fault, faulty line is determined, to cut off faulty line, control protective relaying device action, cut-out
Bus and load and be connected, realize Fault Isolation, it is safe to improve system.
Referring to Fig. 7, a kind of distribution network system failure restraint device of embodiment is also provided, including：Electric signal obtains
Module 710, frequency acquisition module 720, total ground capacitance acquisition module 730, the first inductance acquisition module 740 and the first regulation
Module 750.
Wherein, distribution network system includes main transformer, bus, grounding transformer and arc suppression coil, and arc suppression coil includes
First siding ring and second siding ring corresponding with first siding ring, second siding ring include first coil and the second line
Circle；Main transformer is connected between main AC network and bus, the side connection of bus and grounding transformer, grounding transformer
Opposite side is grounded by the first siding ring of arc suppression coil, and first coil is connected with signal generator, the second coil and controllable silicon
Series connection, bus are also connected with load respectively by each feeder line, and each feeder line is grounded by corresponding direct-to-ground capacitance respectively.
Electric signal acquisition module 710, for obtaining electric signal corresponding to distribution network system, wherein, electric signal bag
Include the voltage and current of the first coil of residual voltage and second siding ring；
Frequency acquisition module 720, for obtaining signal when the phase difference between the voltage and electric current of first coil is zero
The frequency of current signal caused by generator is corresponding；
Total ground capacitance acquisition module 730, for the frequency and the initial inductance of arc suppression coil according to current signal, obtain
Take the total ground capacitance of each feeder line；
First inductance acquisition module 740, for singlephase earth fault to occur according to zero sequence voltage detection to distribution network system
When, the first arc suppression coil target inductance value is obtained according to total ground capacitance and the rated frequency of main AC network；
First adjustment module 750, for obtaining the first object angle of flow corresponding with the first arc suppression coil target inductance value,
The angle of flow of controllable silicon is adjusted to the first object angle of flow.
Above-mentioned distribution network system failure restraint device, first according to signal generator first coil voltage and electric current it
Between phase difference it is corresponding when being zero caused by the frequency of current signal and the initial inductance of arc suppression coil, obtain the total of each feeder line
Direct-to-ground capacitance, then the failure of system is detected according to residual voltage, can be accurately former to the single-phase earthing of distribution network system
Barrier is detected, when detecting generation singlephase earth fault, according to total ground capacitance and the rated frequency of main AC network
The first arc suppression coil target inductance value is obtained, and obtains first object conducting corresponding with the first arc suppression coil target inductance value
Angle, the angle of flow of controllable silicon is adjusted to the first object angle of flow, realizes the adjustment of the angle of flow of controllable silicon.In this way, can accurately it examine
Singlephase earth fault is surveyed, after accurately singlephase earth fault is detected, thyristor operating angle can be adjusted in time, the angle of flow
After adjustment, the electric current for flowing through second siding ring changes therewith, and then the electric current of first siding ring changes therewith, changes pair of feeder line
The voltage of ground electric capacity, the suppression of singlephase earth fault overvoltage is realized, eliminate singlephase earth fault, it is ensured that system safety.
In one of the embodiments, above-mentioned electric signal also includes three-phase voltage.
Referring to Fig. 8, in the present embodiment, above-mentioned distribution network system failure restraint device also includes：
Vector value acquisition module 760, in the first inductance acquisition module 740 according to zero sequence voltage detection to power distribution network system
After singlephase earth fault occurs for system, the value of voltage characteristic parameter vector is obtained according to three-phase voltage；
Second inductance acquisition module 770, for the value according to voltage characteristic parameter vector and voltage characteristic parameter vector
When corresponding preset standard value detects that lonely light earth fault occurs for distribution network system, according to total ground capacitance and main alternating current
The rated frequency of net obtains the second arc suppression coil target inductance value；
Second adjustment module 780, for obtaining the second target angle of flow corresponding with the second arc suppression coil target inductance value,
The angle of flow of controllable silicon is adjusted to the second target angle of flow.
In one of the embodiments, above-mentioned distribution network system failure restraint device, in addition to：Zero-sequence current obtains mould
Block, default characteristic ginseng value acquisition module and faulty line determining module.
Zero-sequence current acquisition module, for according to zero sequence voltage detection to distribution network system occur singlephase earth fault when,
Zero-sequence current corresponding to each feeder line difference after acquisition generation singlephase earth fault in preset time period；
Default characteristic ginseng value acquisition module, for the zero-sequence current according to corresponding to each feeder line difference, obtain each feeder line point
The value of not corresponding default characteristic parameter；
Faulty line determining module, for presetting the value of characteristic parameter according to corresponding to each feeder line difference, each feeder line is entered
Row fault detect, determines faulty line.
In one of the embodiments, above-mentioned distribution network system failure restraint device, in addition to：
Control module, for controlling protective relaying device to act, disconnect faulty line Up Highway UHW and the connection of load.
In one of the embodiments, zero-sequence current acquisition module includes：
Virtual value acquisition module, for obtaining voltage effective value corresponding to residual voltage；
Singlephase earth fault determining module, for being more than the first default residual voltage threshold value when the absolute value of residual voltage
Continuous time be more than the first preset time threshold and voltage effective value be less than or equal to the first default residual voltage threshold value divided by
Value when, determine distribution network system occur singlephase earth fault.
Referring to Fig. 9, in one of the embodiments, above-mentioned vector value acquisition module 760 includes：
Conversion module 761, for carrying out S-transformation to the A phase voltages in three-phase voltage, S complex matrixs are obtained, wherein, S is multiple
The row corresponding time of matrix number, the row corresponding voltage frequency of S complex matrixs；
Modulo block 762, for each element modulus in S complex matrixs, obtaining S modular matrixs, the rows of S modular matrixs to it is corresponding when
Between, the corresponding amplitude of row corresponding voltage frequency of S modular matrixs；
Standard deviation curve acquisition module 763, for obtaining amplitude standard deviation corresponding to each row difference in S modular matrixs, and root
According to amplitude standard deviation corresponding to each row difference, standard deviation curve is obtained；
Voltage characteristic acquisition module 764, for obtaining standard deviation the curve points of maximum, maximum in predetermined period
And average, obtain voltage characteristic parameter vector corresponding to the A phase voltages being made up of the points, maximum and average of maximum
Value.
In one of the embodiments, the first inductance acquisition module includes：
Apart from acquisition module, for obtaining the value of voltage characteristic parameter vector corresponding to A phase voltages and voltage characteristic parameter
Euclidean distance between preset standard value corresponding to vector；
Lonely light earth fault determining module, for when Euclidean distance is more than preset matching threshold value, determining power distribution network
Lonely light earth fault occurs for system.
In one of the embodiments, above-mentioned distribution network system failure restraint device, in addition to：
3rd adjustment module, for when according to zero sequence voltage detection to distribution network system arc grounding failure vanishes, adjusting
The angle of flow of controllable silicon is saved to initial turn-on angle, initial turn-on angle is corresponding with initial arc suppression coil target inductance value, initial extinguishing arc
Coil target inductance value determines according to total ground capacitance and rated frequency.
In one of the embodiments, the 3rd adjustment module, it is additionally operable to preset when the absolute value of residual voltage is less than second
When the continuous time of residual voltage threshold value is more than the second preset time threshold, distribution network system arc grounding failure vanishes are determined.
In one of the embodiments, above-mentioned distribution network system failure restraint device, in addition to：Human-computer interaction module, use
In display total ground capacitance.
In one of the embodiments, above-mentioned human-computer interaction module, it is additionally operable to show faulty line.Specifically, fault wire
Number information corresponding to Lu Youqi, faulty line is determined, that is, the number information of faulty line is determined, show the volume of faulty line
Number information, so that attendant checks that failure occurs in which circuit.
In one of the embodiments, above-mentioned distribution network system failure restraint device, in addition to：Suppression level determines mould
Block, for determining Overvoltage suppressing level.
In the present embodiment, above-mentioned human-computer interaction module, it is additionally operable to show voltage suppression level.
In one of the embodiments, above-mentioned distribution network system failure restraint device, in addition to：Statistical module, for uniting
Count feeder line ground connection quantity.
In the present embodiment, above-mentioned human-computer interaction module, it is additionally operable to display ground connection quantity.Ground connection quantity includes arc grounding
Data and single-phase earthing quantity.
In addition, common parameter can be carried out by the human-computer interaction module in above-mentioned distribution network system failure restraint device
The functions such as setting, initial parameter, operational factor, angle reactance setting and route selection parameter setting, while can also derived record text
Part and realize sectional drawing function.
A kind of computer-readable storage medium is also provided in one embodiment of the invention, is stored thereon with computer program, the meter
The step of calculation machine program realizes above-mentioned distribution network system failure restraint method when being executed by processor.
A kind of computer equipment is also provided in one embodiment of the invention, including memory, processor and is stored in
Above-mentioned distribution network system is realized on reservoir and the computer program that can run on a processor, during computing device computer program
Failure restraint method.
Technical characteristic point in above-mentioned distribution network system failure restraint device, computer-readable storage medium and computer equipment
It is corresponding not with the technical characteristic in above-mentioned distribution network system failure restraint method, will not be repeated here.
Each technical characteristic of above example can be combined arbitrarily, to make description succinct, not to above-described embodiment
In each technical characteristic it is all possible combination be all described, as long as however, lance is not present in the combination of these technical characteristics
Shield, all it is considered to be the scope of this specification record.
Above example only expresses the several embodiments of the present invention, and its description is more specific and detailed, but can not
Therefore it is interpreted as the limitation to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art,
Without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection model of the present invention
Enclose.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (14)
- A kind of 1. distribution network system failure restraint method, it is characterised in that the distribution network system include main transformer, bus, Grounding transformer and arc suppression coil, the arc suppression coil include first siding ring and corresponding with the first siding ring two Secondary lateral coil, the second siding ring include first coil and the second coil；The main transformer is connected to main AC network Between the bus, the bus is connected with the side of the grounding transformer, and the opposite side of the grounding transformer passes through The first siding ring ground connection of the arc suppression coil, the first coil connects with signal generator, second coil with it is controllable Silicon is connected, and the bus is also connected with load respectively by each feeder line, and each feeder line is connect by corresponding direct-to-ground capacitance respectively Ground；The distribution network system failure restraint method comprises the following steps：Electric signal corresponding to the distribution network system is obtained, wherein, electric signal includes residual voltage and the secondary side The voltage and current of the first coil of coil；The signal generator pair when the phase difference obtained between the voltage and the electric current of the first coil is zero The frequency of current signal caused by answering；According to the frequency of the current signal and the initial inductance of the arc suppression coil, the total electric over the ground of each feeder line is obtained Hold；When singlephase earth fault occurs according to the zero sequence voltage detection to the distribution network system, according to the total ground capacitance And the rated frequency of the main AC network obtains the first arc suppression coil target inductance value；The first object angle of flow corresponding with the first arc suppression coil target inductance value is obtained, adjusts the conducting of the controllable silicon Angle is to the first object angle of flow.
- 2. distribution network system failure restraint method according to claim 1, it is characterised in that the electric signal also includes Three-phase voltage；After singlephase earth fault occurs according to the zero sequence voltage detection to the distribution network system, in addition to step：The value of voltage characteristic parameter vector is obtained according to the three-phase voltage；Detected according to preset standard value corresponding to the value of the voltage characteristic parameter vector and the voltage characteristic parameter vector When lonely light earth fault occurs to the distribution network system, according to the specified of the total ground capacitance and the main AC network Frequency acquisition the second arc suppression coil target inductance value；The second target angle of flow corresponding with the second arc suppression coil target inductance value is obtained, adjusts the conducting of the controllable silicon Angle is to the second target angle of flow.
- 3. distribution network system failure restraint method according to claim 1, it is characterised in that also including step：When singlephase earth fault occurs according to the zero sequence voltage detection to the distribution network system, obtain and single-phase earthing event occurs Zero-sequence current corresponding to each feeder line difference after barrier in preset time period；According to the zero-sequence current corresponding to each feeder line difference, obtain and preset characteristic parameter corresponding to each feeder line difference Value；The value of characteristic parameter is preset according to corresponding to each feeder line difference, fault detect is carried out to each feeder line, it is determined that therefore Hinder circuit.
- 4. distribution network system failure restraint method according to claim 3, it is characterised in that it is described determination faulty line it Afterwards, in addition to：Protective relaying device action is controlled, disconnects the bus and the connection of the load on the faulty line.
- 5. distribution network system failure restraint method according to claim 1, it is characterised in that examined according to the residual voltage Surveying the mode of the distribution network system generation singlephase earth fault includes：Obtain voltage effective value corresponding to the residual voltage；The continuous time for being more than the first default residual voltage threshold value when the absolute value of the residual voltage is more than the first preset time Threshold value and the voltage effective value be less than or equal to the described first default residual voltage threshold value divided byValue when, it is determined that described Singlephase earth fault occurs for distribution network system.
- 6. distribution network system failure restraint method according to claim 2, it is characterised in that described according to the three-phase electricity The mode that pressure obtains the value of voltage characteristic parameter vector includes：S-transformation is carried out to the A phase voltages in the three-phase voltage, obtains S complex matrixs, wherein, the row pair of the S complex matrixs Between seasonable, the row corresponding voltage frequency of the S complex matrixs；To each element modulus in the S complex matrixs, S modular matrixs, the row corresponding time of the S modular matrixs, the S moulds square are obtained The corresponding amplitude of row corresponding voltage frequency of battle array；Obtain amplitude standard deviation corresponding to each row difference in the S modular matrixs, and the amplitude mark according to corresponding to each row difference It is accurate poor, obtain standard deviation curve；The standard deviation curve points of maximum, maximum and average in predetermined period are obtained, is obtained by described very big The voltage characteristic parameter vector corresponding to the A phase voltages that the counting of value, the maximum and the average are formed Value.
- 7. distribution network system failure restraint method according to claim 6, it is characterised in that joined according to the voltage characteristic Preset standard value corresponding to the value of number vector and the voltage characteristic parameter vector detects the distribution network system and lonely light occurs The mode of earth fault includes：It is corresponding with the voltage characteristic parameter vector to obtain the value of the voltage characteristic parameter vector corresponding to the A phase voltages Euclidean distance between preset standard value；When the Euclidean distance is more than preset matching threshold value, determine that lonely light earth fault occurs for the distribution network system.
- 8. distribution network system failure restraint method according to claim 1, it is characterised in that also including step：When according to the zero sequence voltage detection to the distribution network system arc grounding failure vanishes, the controllable silicon is adjusted The angle of flow is to initial turn-on angle, and the initial turn-on angle is corresponding with initial arc suppression coil target inductance value, the initial arc blowout wire Target inductance value is enclosed to be determined according to the total ground capacitance and the rated frequency.
- A kind of 9. distribution network system failure restraint device, it is characterised in that the distribution network system include main transformer, bus, Grounding transformer and arc suppression coil, the arc suppression coil include first siding ring and corresponding with the first siding ring two Secondary lateral coil, the second siding ring include first coil and the second coil；The main transformer is connected to main AC network Between the bus, the bus is connected with the side of the grounding transformer, and the opposite side of the grounding transformer passes through The first siding ring ground connection of the arc suppression coil, the first coil connects with signal generator, second coil with it is controllable Silicon is connected, and the bus is also connected with load respectively by each feeder line, and each feeder line is connect by corresponding direct-to-ground capacitance respectively Ground；The distribution network system failure restraint device includes：Electric signal acquisition module, for obtaining electric signal corresponding to the distribution network system, wherein, electric signal includes zero The voltage and current of the first coil of sequence voltage and the second siding ring；When frequency acquisition module for obtaining phase difference between the voltage and the electric current of the first coil is zero The frequency of current signal caused by the signal generator is corresponding；Total ground capacitance acquisition module, for the frequency according to the current signal and the initial inductance of the arc suppression coil, Obtain the total ground capacitance of each feeder line；First inductance acquisition module, for according to zero sequence voltage detection to distribution network system occur singlephase earth fault when, according to Total ground capacitance and the rated frequency of main AC network obtain the first arc suppression coil target inductance value；First adjustment module, for obtaining the first object angle of flow corresponding with the first arc suppression coil target inductance value, regulation can The angle of flow of silicon is controlled to the first object angle of flow.
- 10. distribution network system failure restraint device according to claim 9, it is characterised in that the electric signal is also wrapped Include three-phase voltage；The distribution network system failure restraint device also includes：Vector value acquisition module, for according to the zero sequence voltage detection to the distribution network system occur singlephase earth fault it Afterwards, the value of voltage characteristic parameter vector is obtained according to the three-phase voltage；Second inductance acquisition module, for the value according to the voltage characteristic parameter vector and the voltage characteristic parameter vector When corresponding preset standard value detects that lonely light earth fault occurs for the distribution network system, according to the total ground capacitance and The rated frequency of the main AC network obtains the second arc suppression coil target inductance value；Second adjustment module, for obtaining the second target angle of flow corresponding with the second arc suppression coil target inductance value, adjust The angle of flow of the controllable silicon is saved to the second target angle of flow.
- 11. distribution network system failure restraint device according to claim 9, it is characterised in that the distribution network system event Hinder restraining device, in addition to：Zero-sequence current acquisition module, for according to zero sequence voltage detection to distribution network system occur singlephase earth fault when, obtain Zero-sequence current corresponding to each feeder line difference after generation singlephase earth fault in preset time period；Default characteristic ginseng value acquisition module, for the zero-sequence current according to corresponding to each feeder line difference, it is right respectively to obtain each feeder line The value for the default characteristic parameter answered；Faulty line determining module, for presetting the value of characteristic parameter according to corresponding to each feeder line difference, event is carried out to each feeder line Barrier detection, determines faulty line.
- 12. distribution network system failure restraint device according to claim 11, it is characterised in that the distribution network system event Barrier restraining device also includes：Control module, for controlling protective relaying device to act, disconnect the bus and the load on the faulty line Connection.
- 13. a kind of computer-readable storage medium, is stored thereon with computer program, it is characterised in that the computer program is processed The step of device realizes any one methods described in the claims 1-8 when performing.
- 14. a kind of computer equipment, including memory, processor and it is stored on the memory and can be in the processor The computer program of upper operation, it is characterised in that realize such as claim 1-8 described in the computing device during computer program Method described in middle any one.
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| CN116054186B (en) * | 2023-03-31 | 2023-05-30 | 湖南大学 | Hybrid multifunctional grid-connected converter system under complex scene and control method |
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