CN108023345A - A kind of active arc-extinction device voltage control method of power distribution network - Google Patents
A kind of active arc-extinction device voltage control method of power distribution network Download PDFInfo
- Publication number
- CN108023345A CN108023345A CN201711022276.XA CN201711022276A CN108023345A CN 108023345 A CN108023345 A CN 108023345A CN 201711022276 A CN201711022276 A CN 201711022276A CN 108023345 A CN108023345 A CN 108023345A
- Authority
- CN
- China
- Prior art keywords
- current
- voltage
- distribution network
- neutral point
- power distribution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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 voltage control method of power distribution network.This method is used for the output voltage for controlling the active arc-extinction device being connected between neutral point and the earth, it is consistent in singlephase earth fault with faulted phase voltage opposite number, so as to achieve the purpose that failure extinguishing arc.This method achievees the purpose that to control output voltage by injecting specific electric current to neutral point, this electric current includes and fault current is corresponding active and reactive and harmonic component.The specific implementation of control method includes neutral point voltage outer shroud and output filter inductive current inner ring two parts.Outer shroud adjusts neutral point voltage to generate current inner loop set-point using proportional integrator and the combining form of ratio resonant controller；Inner ring adjusts output filter inductive current using proportional controller, makes its follow current inner ring set-point, and is feedovered by output filter capacitance voltage to achieve the purpose that to improve current control accuracy.Capacitance current need not be detected, it can be achieved that ground resistance change and fault current distortion under extinguishing arc.
Description
Technical field
The present invention relates to the active extinguishing arc field of earth fault, and in particular, to a kind of active arc-extinction device voltage of power distribution network
Control method.
Background technology
In power distribution network, the reliability of power supply has very important significance, and power supply reliability problem is mostly originating from single
Phase earth fault.Power distribution network popularization increases earth-fault current, and fault electric arc can not extinguish naturally, easily leads to electric power confession
The interruption answered.Traditional earth fault arc-extinction device does not account for its active point mainly for the capacitive component in earth current
Amount and harmonic component, and need to detect capacitance current, extinguishing arc effect is limited.In addition, arc suppression coil and line mutual-ground capacitor may
Generation series resonance, produces overvoltage so as to cause cross line fault and line insulation to damage.Therefore, earth current is compensated and disappeared entirely
The continuously adjustable technology of arc coil inductance causes extensive attention in practical applications, and active arc-extinction device is in power distribution network
Using also further important.
The active arc-extinction device of power distribution network can not control rectifier, single-phase inverter, LC wave filters and isolation by a three-phase
Transformer TiForm, wherein rectifier and inverter is connected in parallel by direct current capacitors.By gathering power distribution network three-phase voltage
And neutral point voltage, active arc-extinction device can produce an amplitude and the controllable zero-sequence current of phase, be filtered by outputting inductance capacitance
After ripple, the electric current is injected to suppress residual voltage to power network neutral point, so as to suppress current in the fault point, destroys arc reignition
Condition, be grounded electric current compensate entirely, under ground resistance change and fault current distortion extinguishing arc purpose, have precision it is high,
The characteristics of rapid is responded, can be widely applied to distribution network system, effectively solves the problems, such as singlephase earth fault.
The content of the invention
The present invention proposes a kind of active arc-extinction device voltage control method of power distribution network, by control be connected to neutral point with it is big
The output voltage of active arc-extinction device between ground, makes it keep one with faulted phase voltage opposite number in singlephase earth fault
Cause, be zero by the control of trouble point voltage-to-ground, so as to achieve the purpose that failure extinguishing arc.
To achieve the above object, the technical solution adopted by the present invention is a kind of active arc-extinction device voltage control of power distribution network
Method, it is characterised in that including in extinguishing arc reference current generation method, neutral point voltage outer shroud and output filter inductive current
Ring.Wherein, extinguishing arc reference current generation method, it is characterised in that the extinguishing arc reference current generated includes active and reactive harmony
Wave component, it is corresponding with line leak electric current, capacitance current and fault current harmonic wave respectively, and haveForm, wherein UCFor faulted phase voltage, RSFor the single-phase bleeder resistance value of power distribution network,
CSFor the single-phase direct-to-ground capacitance value of power distribution network, IhFor fault current harmonic component；Neutral point voltage outer shroud, it is characterised in that voltage is given
Definite value is the opposite number of singlephase earth fault phase voltage, and value of feedback is neutral point voltage, outer ring controller by proportional integrator with
Ratio resonant controller is composed, and is hadForm, wherein KpFor proportionality coefficient, KiFor product
Divide coefficient, KrFor resonance coefficient, ω0For fundamental frequency, in controller parameter, ratio, the purpose of integral coefficient are to offset distribution
Net the limit in equivalent first-order transfer function；Output filter inductive current inner ring, it is characterised in that given value of current value is above-mentioned
The regulated quantity that neutral point voltage outer shroud is generated, value of feedback are output filter inductive current, and interior ring controller uses ratio tune
Device is saved, inner ring further includes the feedforward of output filter capacitance voltage, and feed-forward coefficients are the inverse of inverter gain, proportional controller
Output obtains PWM modulation ripple after being superimposed with capacitance voltage feedforward value.
The beneficial effects of the invention are as follows：
1) capacitance current need not be detected, by output capacitance electric voltage feed forward and inductor current feedback, is realized in ground connection electricity
Resistive and there are the good extinguishing arc effect under harmonic wave interference；
2) by the active and reactive and harmonic component in compensation of ground electric current, it is grounded fault current and compensates entirely, so that
Achieve the purpose that the reliable blow-out of earth fault.
The present invention is further illustrated below in conjunction with the accompanying drawings.
Brief description of the drawings
Fig. 1 is the active extinguishing arc topology diagram of power distribution network.
Fig. 2 is system simplified electrical circuit diagram.
Fig. 3 is power distribution network equivalent model.
Fig. 4 is active arc-extinguishing system voltage control schematic diagram.
Fig. 5 controls simplified block diagram for active arc-extinguishing system voltage.
Fig. 6 is the active extinguishing arc topology diagram of power distribution network.
Embodiment
Distribution network system is analyzed below in conjunction with attached drawing and active arc-extinction device voltage control method illustrates.
Fig. 1 be one feeder line of band 10kV distribution network system topological structures, UX(X=A, B, C) represents A, B, C three-phases respectively
Supply voltage, RXAnd CXRepresent respectively per relatively bleeder resistance and direct-to-ground capacitance.It is assumed that singlephase earth fault occurs, in C phases, to connect
Earth fault resistance is RF, for harmonic source using the neutral harmonic current source simulation for being connected to A phases, its electric current is ih.Power network neutral point leads to
Active arc-extinction device ground connection is crossed, can not control rectifier, single-phase inverse wherein containing a three-phase as shown in dotted line frame in Fig. 1
Become device, LC wave filters and isolating transformer Ti.Rectifier and inverter are connected in parallel by direct current capacitors.
To simplify the analysis, above-mentioned active arc-extinction device is replaced with controllable current source Ii.Assuming that power distribution network three is relatively distributed
Parameter is symmetrical, and three-phase resistance to earth, capacitance and impedance are respectively RS、CSAnd ZS, while assume system voltage for fundamental frequency just
Sequence, earth current, faulted phase voltage, neutral point voltage-to-ground use I respectivelyF, UFAnd UNRepresent, thus obtain be shown in Fig. 2
System simplified electrical circuit diagram.As can be seen that neutral point voltage-to-ground and faulted phase voltage are equal in harmonic wave domain.Therefore, in order to limit
Earth current processed is zero, by IFValue be set to zero, then obtain IiExpression formula be
The full compensation electric current of definition is in the presence of impedance ground change and Zero-pharse harmonic, can guarantee that system all the time
The Injection Current that earth current is zero, the electric current are made of the active and reactive and harmonic component of zero sequence earth current, respectively with line
Road leakage current, capacitance current and fault current harmonic wave are corresponding.With-UCInstead of UNf, the expression formula of Injection Current can be obtained
For
Wherein UCFor faulted phase voltage, IhFor fault current harmonic component.If, it is apparent that control Injection Current
IiFor Iful_com, faulted phase voltage and earth current can be restricted to zero, so as to achieve the purpose that to eliminate fault electric arc.By
In IiExpression formula be built upon IFEqual to zero, i.e. UFUnder the premise of null, at this time
UN=-UC,
It is equivalent to the control of neutral point voltage-to-ground be U that is, earth current compensates entirelyC(i.e. faulted phase voltage)
Opposite number.Therefore, by control neutral point voltage-to-ground be faulted phase voltage opposite number, it is possible to achieve earth current it is complete
Compensation.
On the basis of the full compensation principle of analysis grounding electric current, to realize the active arc-extinction device voltage control of power distribution network, point
Power distribution network zero sequence circuit is not modeled from fundamental wave domain harmony wave zone, it is in fundamental wave domain equivalent to voltage source E0And impedance ZeqString
Connection, current source i is equivalent in harmonic wave domainh, obtain the power distribution network equivalent model shown in Fig. 3.For further control and analysis,
Model conversion is arrived to the low-pressure side of isolating transformer, according to Thevenin's theorem, E0And ZeqIt can be expressed as
Equivalent voltage source E0Represent three relatively asymmetrical voltages caused by parameter unbalance, equiva lent impedance ZeqRepresent active
The zero sequence impedance of the load of arc-extinction device, i.e. power distribution network, the two is not only related with the distributed constant of power distribution network, and with ground connection
Resistance is related.When high resistance earthing fault occurs, bleeder resistance can be ignored, and the load of active arc-extinction device at this time is mainly in appearance
Property.
By to power distribution network Equivalent, on the premise of the extinguishing arc reference current that need to be injected has been obtained, can to
Power grid uses active arc-extinction device double-closed-loop control method.Fig. 4 is active arc-extinguishing system voltage control schematic diagram, and Fig. 5 is active
Arc-extinguishing system voltage controls simplified block diagram.The control method is by ring group in neutral point voltage outer shroud and output filter inductive current
Into.Controller outer voltage adjusts neutral point voltage with life using proportional integrator and the combining form of ratio resonant controller
Into current inner loop set-point, for realizing system zero steady-state error at fundamental frequency, and suppress earth fault harmonic current and bear
Voltage fluctuation caused by carrying change, neutral point voltage U is can obtain by Fig. 5NsTransmission function：
Due to Gad/ZeqIt is approximately equal to sCo, in outer voltage bandwidth range, GinSize can be equivalent to 1, so as to
Obtain G2Expression formula be
If it can be seen that GuTend to be infinitely great at fundamental frequency, then G2It will go to zero, at this time E0It can be pressed down completely
System.For 3 times be primarily present in earth-fault current, 5 times, 7 order harmonic components, forward path Gad/ (sCo) to harmonic wave just
There is certain inhibitory action, using PI controller combination resonant controllers with regard to good control effect can be reached.ForWherein KpFor proportionality coefficient, KiFor integral coefficient, KrFor resonance coefficient, ω0For fundamental frequency,
By choosing suitable parameter, at fundamental frequency, the gain of forward path transmission function tends to be infinitely great, so as to not only realize and be
System zero steady-state error, and to E0There is obvious inhibiting effect.In the case of different ground fault resistances, before Voltage loop to it is logical with
Track performance and to the more preferable inhibition of low-frequency harmonics electric current.When ground fault resistance increases, shearing frequency also with increase,
Showing under high resistance earthing fault, bandwidth is bigger, and response speed is faster, since actual ground fault resistance is usually all larger,
Therefore control system low-frequency range performance is easily guaranteed that.Inner ring adjusts output filter inductive current using proportional controller, makes it
Follow current inner ring set-point, and feedovered by output filter capacitance voltage to achieve the purpose that to improve current control accuracy.
The regulated quantity that given value of current value is generated by neutral point voltage outer shroud, value of feedback are output filter inductive current, and inner ring controls
Device uses proportional controller, and inner ring further includes the feedforward of output filter capacitance voltage, and feed-forward coefficients are the inverse of inverter gain.
The output of proportional controller obtains PWM modulation ripple after being superimposed with capacitance voltage feedforward value.It can be seen that such a voltage control method
Capacitance current need not be detected as other conventional methods, only need to by output capacitance electric voltage feed forward and inductor current feedback,
It may be implemented in ground resistance change and there are the good extinguishing arc effect under harmonic wave interference, while improve traditional ground connection event
Not the shortcomings that barrier arc-extinction device does not account for active component and harmonic component, to the active and reactive and harmonic component in earth current
Compensated, compensated entirely so as to fulfill earth-fault current, the purpose of the reliable extinguishing arc of failure.
Claims (4)
- A kind of 1. active arc-extinction device voltage control method of power distribution network, it is characterised in that including extinguishing arc reference current generation method, Neutral point voltage outer shroud and output filter inductive current inner ring.
- 2. extinguishing arc reference current generation method according to claim 1, it is characterised in that the extinguishing arc reference current generated It is corresponding with line leak electric current, capacitance current and fault current harmonic wave respectively comprising active and reactive and harmonic component, and have HaveForm, wherein UCFor faulted phase voltage, RSFor the single-phase bleeder resistance of power distribution network Value, CSFor the single-phase direct-to-ground capacitance value of power distribution network, IhFor fault current harmonic component.
- 3. neutral point voltage outer shroud according to claim 1, it is characterised in that voltage set-point is singlephase earth fault phase The opposite number of voltage, value of feedback are neutral point voltage, outer ring controller combined by proportional integrator and ratio resonant controller and Into havingForm, wherein KpFor proportionality coefficient, KiFor integral coefficient, KrFor resonance coefficient, ω0For fundamental frequency.In controller parameter, ratio, the purpose of integral coefficient are to offset the equivalent first-order transfer function of power distribution network In limit.
- 4. output filter inductive current inner ring according to claim 1, it is characterised in that given value of current value will for right The regulated quantity for asking the neutral point voltage outer shroud described in 3 to be generated, value of feedback are output filter inductive current, interior ring controller Using proportional controller, inner ring further includes the feedforward of output filter capacitance voltage, and feed-forward coefficients are the inverse of inverter gain.Than The output of example adjuster obtains PWM modulation ripple after being superimposed with capacitance voltage feedforward value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711022276.XA CN108023345B (en) | 2017-10-27 | 2017-10-27 | Voltage control method for power distribution network active arc suppression device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711022276.XA CN108023345B (en) | 2017-10-27 | 2017-10-27 | Voltage control method for power distribution network active arc suppression device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108023345A true CN108023345A (en) | 2018-05-11 |
| CN108023345B CN108023345B (en) | 2020-03-13 |
Family
ID=62080380
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711022276.XA Expired - Fee Related CN108023345B (en) | 2017-10-27 | 2017-10-27 | Voltage control method for power distribution network active arc suppression device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108023345B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109301809A (en) * | 2018-10-23 | 2019-02-01 | 福州大学 | A kind of active flexible extinguishing arc switching method of novel power distribution network |
| CN109768536A (en) * | 2018-12-29 | 2019-05-17 | 国网河南省电力公司洛阳供电公司 | One kind being based on alternating-current chopper circuit one-phase earthing failure in electric distribution network extinguishing arc control method |
| CN109921404A (en) * | 2019-04-02 | 2019-06-21 | 云南电网有限责任公司电力科学研究院 | A kind of full compensation device of controllable current source earth current and method |
| CN109921402A (en) * | 2019-03-29 | 2019-06-21 | 云南电网有限责任公司电力科学研究院 | A kind of controllable voltage source based on failure phase phase voltage compensates tracking compensation technique entirely |
| CN110165669A (en) * | 2019-04-30 | 2019-08-23 | 云南电网有限责任公司电力科学研究院 | A kind of power distribution network active compensator and its suppressing method |
| CN111262234A (en) * | 2020-03-17 | 2020-06-09 | 内蒙古电力（集团）有限责任公司乌兰察布电业局 | Self-adaptive full-compensation arc extinction method |
| CN111934305A (en) * | 2020-08-20 | 2020-11-13 | 福州大学 | Flexible arc extinction method for single-phase earth fault of power distribution network based on voltage decoupling control |
| CN112881858A (en) * | 2021-01-12 | 2021-06-01 | 福州大学 | Single-phase earth fault phase selection method for parameter asymmetric power distribution network |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090021964A1 (en) * | 2007-07-18 | 2009-01-22 | Wen Hsu | Modularized Active Power Filter |
| CN103715695A (en) * | 2013-12-24 | 2014-04-09 | 国家电网公司 | Intelligent power distribution network neutral point grounding active full-compensation control system |
| 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 |
| CN107064733A (en) * | 2017-03-15 | 2017-08-18 | 长沙理工大学 | Power distribution network flexible ground device single-phase earth fault line selection and arc extinguishing method |
-
2017
- 2017-10-27 CN CN201711022276.XA patent/CN108023345B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090021964A1 (en) * | 2007-07-18 | 2009-01-22 | Wen Hsu | Modularized Active Power Filter |
| CN103715695A (en) * | 2013-12-24 | 2014-04-09 | 国家电网公司 | Intelligent power distribution network neutral point grounding active full-compensation control system |
| 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 |
| CN107064733A (en) * | 2017-03-15 | 2017-08-18 | 长沙理工大学 | Power distribution network flexible ground device single-phase earth fault line selection and arc extinguishing method |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109301809A (en) * | 2018-10-23 | 2019-02-01 | 福州大学 | A kind of active flexible extinguishing arc switching method of novel power distribution network |
| CN109768536A (en) * | 2018-12-29 | 2019-05-17 | 国网河南省电力公司洛阳供电公司 | One kind being based on alternating-current chopper circuit one-phase earthing failure in electric distribution network extinguishing arc control method |
| CN109921402A (en) * | 2019-03-29 | 2019-06-21 | 云南电网有限责任公司电力科学研究院 | A kind of controllable voltage source based on failure phase phase voltage compensates tracking compensation technique entirely |
| CN109921404A (en) * | 2019-04-02 | 2019-06-21 | 云南电网有限责任公司电力科学研究院 | A kind of full compensation device of controllable current source earth current and method |
| CN110165669A (en) * | 2019-04-30 | 2019-08-23 | 云南电网有限责任公司电力科学研究院 | A kind of power distribution network active compensator and its suppressing method |
| CN111262234A (en) * | 2020-03-17 | 2020-06-09 | 内蒙古电力（集团）有限责任公司乌兰察布电业局 | Self-adaptive full-compensation arc extinction method |
| CN111934305A (en) * | 2020-08-20 | 2020-11-13 | 福州大学 | Flexible arc extinction method for single-phase earth fault of power distribution network based on voltage decoupling control |
| CN112881858A (en) * | 2021-01-12 | 2021-06-01 | 福州大学 | Single-phase earth fault phase selection method for parameter asymmetric power distribution network |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108023345B (en) | 2020-03-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108023345A (en) | A kind of active arc-extinction device voltage control method of power distribution network | |
| Wang et al. | A novel neutral electromagnetic hybrid flexible grounding method in distribution networks | |
| WO2020087811A1 (en) | Method for suppressing fault phase residual voltage of resonant grounding system based on precise tuning control on active adjustable complex impedance | |
| CN104638630B (en) | The New Method of Active Electronic Compensation of power network capacitive earth current | |
| CN108471124B (en) | Resonance suppression method for photovoltaic inverter to be connected into alternating current-direct current hybrid micro-grid | |
| CN102738813B (en) | Voltage control method in power system with non-effectively earthed neutral | |
| Baitha et al. | A comparative analysis of passive filters for power quality improvement | |
| CN108306329A (en) | The positive damping of HVDC transmission system reconstructs impedance stabilization control method | |
| Plet et al. | A method of voltage limiting and distortion avoidance for islanded inverter-fed networks under fault | |
| CN103368167A (en) | Single-phase earth fault fundamental current full compensation device and method | |
| EP2599179B1 (en) | The apparatus compensating ground currents connected to a transformer neutral point | |
| Fediuk et al. | Development of power supply devices for limitations of short circuit on the ship's hull | |
| CN110261729A (en) | A kind of power distribution network flexible ground control method | |
| CN113507096A (en) | Oscillating circuit containing parasitic parameters and direct current change-over switch | |
| CN108512227A (en) | A kind of adjusting method of single-phase LCL gird-connected inverters improved electric throttle regulator | |
| CN109950886B (en) | Control method for controllable current source grounding full compensation with inductance compensation | |
| CN107800151A (en) | A kind of isolated island microgrid inverter control method of the virtual passive filter of band | |
| CN112924896B (en) | Integrated suppression method for three-phase imbalance and single-phase earth fault of power distribution network | |
| CN112653343B (en) | LCL type grid-connected single inverter current feedback active damping method | |
| CN112736887B (en) | Power distribution network ground fault integrated arc extinction method based on power electronic transformer | |
| Mukherjee et al. | Power System Harmonic Reduction using Shunt Active Filter | |
| JPH11103526A (en) | Power distributing circuit | |
| Naghshbandy et al. | Blocking DC flux due to geomagnetically induced currents in the power network transformers | |
| Fediuk | Limitation of the single-phase grounding current | |
| Gao et al. | Active arc suppression method of distribution network based on equivalent LCL filter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200313 Termination date: 20211027 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |