CN105977947B - A kind of active arc-extinction device of power distribution network - Google Patents
A kind of active arc-extinction device of power distribution network Download PDFInfo
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- CN105977947B CN105977947B CN201510885088.4A CN201510885088A CN105977947B CN 105977947 B CN105977947 B CN 105977947B CN 201510885088 A CN201510885088 A CN 201510885088A CN 105977947 B CN105977947 B CN 105977947B
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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 invention discloses a kind of active arc-extinction device of power distribution network and its current control method, which achievees the purpose that earth fault extinguishing arc by injecting power current to power network neutral point.The amplitude and phase of Injection Current are obtained by injecting specific electric current to neutral point twice, and in conjunction with corresponding computational methods.Injection Current controller is made of ratio resonant controller, Injection Current deviation signal is obtained into modulated signal by ratio resonant controller, it drives inverter switching device pipe to generate inverter current after carried-based PWM again, is exported to power network neutral point after filtered circuit.Device fast response time, high sensitivity, the low cost, may be implemented that transient earthing failure is quick, reliable arc extinguishing.
Description
Technical field
The invention belongs to Relay Protection Technology in Power System field, more particularly to a kind of active arc-extinction device of power distribution network.
Background technology
Electric system is a non-linear, large-scale complication system, and power distribution network gos deep into user terminal, and running environment is more
Become, random fault easily occurs, wherein about 70% failure is instantaneity earth fault.Since power distribution network has capacitance over the ground and lets out
Ohmic leakage, therefore earth-fault current is capacitance current and resistive leakage current.To limit earth-fault current, China's power distribution network
Generally using isolated neutral, through the neutral non-effective groundings method of operation such as grounding through arc, resistance grounded.With
Urban and rural power grids develop, and capacitance current increases, and instantaneity earth fault extinguishing arc is less able, and the electric arc of fault point is difficult to voluntarily put out
It goes out, is also easy to produce fault overvoltage, cause multiple accident, or even cause large-area power-cuts, jeopardize power grid security, influence social steady
It is fixed.
Influence earth fault extinguishing arc because being known as：Fault current, indirect arc overvoltage (include the recovery of faulted phase voltage
Initial velocity, recovery time and amplitude).Fault current is smaller, and dielectric damages are smaller, is more conducive to failure extinguishing arc；Faulted phase voltage
Recovery initial velocity it is slower, recovery time is longer, amplitude is smaller, be more difficult to puncture dielectric again, prevent arc reignition, more have
Conducive to failure extinguishing arc.
Current power distribution network failure extinguishing arc generally realizes that the device is by adjusting extinguishing arc using post-set arc suppression coils device
Coiled contact carries out condenser current compensation dynamically to change access capacity, is difficult in degree of regulation and response speed etc. full
The requirement of the fast and reliable blow-out of foot.Therefore, how fast and accurately to realize extinguishing arc purpose, ensure the fortune of power distribution network safety and stability
Row, becomes problem urgently to be resolved hurrily.
Invention content
To solve technical problem present in above-mentioned power distribution network arc extinguishing method, the present invention proposes that a kind of power distribution network is active to disappear
Arc device, which solves the problems of the fast and reliable inhibition of distribution net work earthing fault electric current.Occur in distribution net work earthing fault
When, rapidly to neutral point Injection Current, forced fault point voltage is zero, realizes the reliable extinguishing arc of transient fault.Its topology diagram
As shown in Figure 1.
The technical solution adopted by the present invention to solve the technical problems includes the following steps：
1) power distribution network three-phase voltage and neutral point voltage are measured, whether judging that earth fault occurs；
2) it when judging that earth fault occurs, is injected from the active arc-extinction device of power distribution network to power network neutral point electric twice
Stream, to determine the reference current for carrying out fault current compensation；
3) the active arc-extinction device actual output current of power distribution network and the difference of reference current are produced through ratio resonant controller
Raw modulating wave controls the break-make of inverter switching device pipe to power distribution network Injection Current, to force event by triangular modulation method
Barrier point voltage and earth-fault current are zero.
In view of at resonant frequency, the gain of ratio resonant controller is infinitely great, and is increased in disresonance frequence
Benefit declines obviously, and the parameter of component cannot be measured accurately in reality and the precision of digitial controller restricts, resonance
Gain at frequency can not possibly reach infinitely great.So to consider actual resonance frequency and reason in design proportion resonant controller
Think the deviation of resonance, the above analysis takes the transmission function to be：
K in formulapAnd krRespectively proportionality coefficient and resonance coefficient, ratio resonant controller transmission function schematic diagram such as Fig. 2 institutes
Show.Output current deviation obtains modulating wave U after ratio resonant controllerr, as shown in formula
Wherein I*For inject neutral point reference current, I be neutral point actual current, after obtaining modulating wave, by its with
Triangular carrier generates inverter switching device pipe driving pulse more afterwards, injects electricity to power network neutral point to control active arc-extinction device
Stream.
Injection Current reference value in order to obtain, the present invention propose the reference current generation method of Injection Current twice, lead to
After injection amplitude twice different, the identical electric current of phase determines reference current.
For power distribution network shown in FIG. 1, it is assumed that singlephase earth fault is happened at C phases, from Kirchhoff's law
Establishing power grid three-phase voltage and parameter is symmetrical over the ground, then have
Assuming that fault point voltage UC=0, injected value of current at this time is reference current, which is represented by
Assuming that in formula (4),
Then formula (4) is represented by
Ii=UNY1+ECY2 (7)
It is at twice that phase is identical, the different power current I of amplitudei1、Ii2Neutral point is injected, in measuring accordingly respectively
Property point voltage UN1, UN2.Ii1Capacitance current convolution (5) when being installed by device determines；Ii2It is taken as Ii170%, by Ii1
And Ii2Substitution formula (7), is calculated
Convolution (5), formula (6) and formula (8) can obtain：
Wherein △ Ii=Ii1-Ii2, △ UN=UN1-UN2。
The solution have the advantages that：
(1) device fast response time, high sensitivity, the low cost, may be implemented transient earthing failure quickly, reliably go out
Arc；
(2) reference current generation method only needs to inject two primary currents to neutral point, without measuring power distribution network parameter over the ground, has
There is the characteristics of easy, rapid, strong operability；
(3) ratio resonant controller used by can make up between output current actual frequency and controller resonant frequency
Deviation caused by the relatively low problem of stable state accuracy, ensure that the control accuracy of output current.
The present invention will be further described below with reference to the drawings.
Description of the drawings
Fig. 1 is the active arc-extinction device topology diagram of power distribution network；
Fig. 2 is ratio resonance control schematic diagram；
Fig. 3 is the active arc-extinction device program flow chart of power distribution network.
Neutral point voltage and Injection Current oscillogram when Fig. 4 is first time Injection Current；
Neutral point voltage and Injection Current oscillogram when Fig. 5 is second of Injection Current；；
Fig. 6 is reference current and neutral point sample rate current oscillogram；
Fig. 7 is that faulted phase voltage emulates dynamic waveform figure；
Fig. 8 is that fault current emulates dynamic waveform figure.
Specific implementation mode
The active arc-extinction device software flow pattern of power distribution network is as shown in Figure 3.Power distribution network three-phase voltage and zero is continuously measured first
Sequence voltage, when residual voltage be more than 15% phase voltage, judge earth fault, compare three-phase voltage size, judge voltage most
Low phase is failure phase, and measures faulted phase voltage；By active arc-extinction device to power network neutral point Injection Current Ii1, in measurement
Property point voltage amplitude and phase, be delayed after 1s to power network neutral point Injection Current Ii2, neutral point voltage is measured again, and is led to
It crosses relational expression (3) and obtains optimal reference current；It is adjusted through ratio resonant controller by reference current and using the difference of electric current
Signal processed, then with IGBT driving pulses are obtained after triangular carrier, control IGBT break-make generate inverter current；Inverter current
Power network neutral point is injected by injection transformer after filtered circuit filtering, inhibits fault point voltage to zero, reaches extinguishing arc
Purpose.
In order to verify the validity of the active arc-extinction device of power distribution network described in the invention, in PSIM9.0 simulation softwares
Injection Current simulation model twice is built, simulation result is as shown in Figure 6 to 8.From dynamic waveform as can be seen that control system
It unites to the response speed of fault point voltage quickly, passes through to observe and find, tune of the system for fault point voltage and fault current
The whole time is 1ms or so, and far smaller than post-set arc suppression coils are up to the response time of 3~5 cycles.It can from Fig. 7 and Fig. 8
To find out, after putting into active arc-extinction device, fault point voltage UC sizes are suppressed to 3.7V by 214V, fault current If sizes by
21.3A is reduced to 0.68A, and extinguishing arc is with obvious effects, demonstrates the validity of the put forward principle of the present invention and method.
Claims (1)
1. a kind of active arc-extinction device of power distribution network, it is characterised in that：Including can not control rectifier, inverter, control circuit, filtering
Circuit, injection transformer, it is described can not control rectifier be connected to grounding transformer pair side, provide stable DC for inverter
Pressure；The inverter provides driving pulse by control circuit, generates specific power current, passes through note after filtered circuit filtering
Enter transformer injection power network neutral point and realizes the purpose of extinguishing arc to inhibit fault point voltage；
The active arc-extinction device of the power distribution network is used for：At twice by power current Ii1、Ii2Neutral point is injected, is measured respectively corresponding
Neutral point voltage UN1、UN2, combination failure phase voltage E passes through relational expression
I*=(Ii2UN1-Ii1UN2-ΔIiE)/ΔUNIt obtains referring to output current；
The electric current injected twice is power frequency, and phase angle is identical, and amplitude is different, for the first time the current value of injection according to system over the ground
Parameter determines that the amplitude of second of Injection Current is the 70% of first time Injection Current.
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| CN201510885088.4A CN105977947B (en) | 2015-12-04 | 2015-12-04 | A kind of active arc-extinction device of power distribution network |
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| CN201510885088.4A CN105977947B (en) | 2015-12-04 | 2015-12-04 | A kind of active arc-extinction device of power distribution network |
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| CN105977947B true CN105977947B (en) | 2018-09-11 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106356833A (en) * | 2016-10-12 | 2017-01-25 | 广东电网有限责任公司电力科学研究院 | Power distribution network-based control method for grounding failure suppression device |
| CN106655144A (en) * | 2017-02-13 | 2017-05-10 | 云南电网有限责任公司电力科学研究院 | Dual-closed-loop control-based active voltage arc extinction method and apparatus for power distribution network in fault |
| CN107276082B (en) * | 2017-07-05 | 2020-10-02 | 长沙理工大学 | Active voltage reduction safe operation method for ground fault phase of non-effective grounding system |
| CN107482607A (en) * | 2017-10-16 | 2017-12-15 | 长沙理工大学 | It is a kind of to present type flexible ground device, failure arc extinguishing method and its DC side voltage control method and system for power distribution network |
| CN108462162B (en) * | 2018-01-31 | 2019-09-06 | 华中科技大学 | A kind of multifunction flexible earthing or grounding means |
| CN109167345B (en) * | 2018-09-26 | 2019-12-03 | 云南电网有限责任公司电力科学研究院 | A kind of ground fault arc-suppressing method and device based on controllable voltage source |
| CN109950893A (en) * | 2019-02-25 | 2019-06-28 | 华北电力大学 | The active arc-extinguishing system of singlephase earth fault based on variable voltage source |
| CN110544929B (en) * | 2019-10-18 | 2022-06-07 | 云南电网有限责任公司电力科学研究院 | Earth fault current compensation system and method for self-generating power phase power supply |
| CN114142451B (en) * | 2021-11-19 | 2022-09-23 | 广东福德电子有限公司 | Power distribution network ground fault voltage reduction active arc suppression power supply and control method thereof |
| CN117277249B (en) * | 2023-11-20 | 2024-01-30 | 昆明理工大学 | Single-phase earth fault voltage and current matching arc extinction method and system for power distribution network |
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| CN104218563A (en) * | 2014-09-26 | 2014-12-17 | 福州大学 | Power distribution network fault arc extinction method by connecting neutral point to the ground through multi-level converter |
| CN104779602A (en) * | 2014-12-23 | 2015-07-15 | 中国矿业大学 | Flexible control method of zero-sequence voltage of resonant earthed system based on active inversion |
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| EP1682909A1 (en) * | 2003-10-22 | 2006-07-26 | ABB Oy | Method and apparatus for identifying intermittent earth fault |
| CN104092228A (en) * | 2014-06-30 | 2014-10-08 | 中国石油大学(华东) | Asymmetric voltage two-point active control method for neutral point non-effective grounding system |
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Address after: 410114 No. 960, Section 2, Wanjiali South Road, Tianxin District, Changsha City, Hunan Province Patentee after: CHANGSHA University OF SCIENCE AND TECHNOLOGY Address before: 410114 No. 960, South Wanjiali Road, Yuhua District, Changsha City, Hunan Province Patentee before: CHANGSHA University OF SCIENCE AND TECHNOLOGY |
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