CN106786470A - A kind of power network neutral point flexible ground system - Google Patents
A kind of power network neutral point flexible ground system Download PDFInfo
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- CN106786470A CN106786470A CN201510809388.4A CN201510809388A CN106786470A CN 106786470 A CN106786470 A CN 106786470A CN 201510809388 A CN201510809388 A CN 201510809388A CN 106786470 A CN106786470 A CN 106786470A
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of power network neutral point flexible ground system, including：Grounding transformer, power electronic equipment, controller and rectification circuit；The first winding of the grounding transformer is linked into the power network bus, neutral ground, the Secondary Winding of the grounding transformer is set to the triangular form structure that is open, the Secondary Winding is linked into the output end of the power electronic equipment, the controller is connected to the power network and the power electronic equipment, the controller measures the voltage and current of the power network and the voltage and current of the power electronic equipment, and control Secondary Winding input current of the power electronic equipment to the grounding transformer, the rectification circuit provides direct current for the power electronic equipment.System of the invention can realize various power network neutral grounding modes and can switch online, solve the problems, such as that power electronic devices bears high voltage.
Description
Technical field
The present invention relates to technical field of power systems, and in particular to a kind of power network neutral point is flexible
Earthed system.
Background technology
In the transformer and motor of three-phase ac power system neutral, i.e. Y-connection
Property point, the referred to as electric connecting mode between the earth, Power Network Neutral.
Neutral grounding mode is related to the security reliability of power network, economy, directly affects equipment
The selection of dielectric level, system overvoltage level and the means of relay protection, communication interference etc..
110kV and above power network are typically effectively connect using high current earthing mode, i.e. neutral point
Ground mode, such neutral point potential is fixed as ground potential, when there is singlephase earth fault,
Non-faulting phase voltage is raised not over 1.4 times of operation phase voltages；Transient overvoltage level
It is relatively low；Fault current is very big, and relay protection can be acted rapidly in tripping operation, cut off failure,
It is shorter that system equipment bears the overvoltage time.In actual motion, to reduce single-phase earthing
Electric current, some transformers use earth-free mode.
3~66kV power distribution networks typically use small current neutral grounding mode, isolated neutral or
By arc suppression coil and the three-phase system of high resistance grounding, when a certain phase occurs earth fault
When, due to that can not constitute short-circuit loop, earth-fault current is often smaller than load current to be obtained
It is many, i.e. neutral non-effective grounding mode.This mode power network allows band single-phase earthing event
Barrier runs in short-term, and power supply quality is preferable.In China it is generally acknowledged thatSystem belongs to
Small current neutral grounding system power network, the U.S. and West Europe typically handleSystem belong to it is small
Current grounding system.
Neutral point small current neutral grounding mode can be divided mainly into following three kinds：It is earth-free, through disappearing
Arc coil is grounded and resistance grounded.Specify 35kV electricity in China's electrical equipment design specification
If net unbalanced earth fault capacitance current is more than 10A, if 3kV~10kV power network ground capacities
Electric current is more than 30A, is required for using neutral by arc extinction coil grounding mode.With power supply
The development of network, the user especially with cable run increasingly increases so that system list
Phase earthing capacitance current is continuously increased, and causes singlephase earth fault in power network to develop into accident
Possibility increase.In order to avoid singlephase earth fault expands, power distribution network uses neutral point
Resistance grounded mode, coordinates relay protection quickly to cut off faulty line and increasingly increases, I
State《Urban power network planning Guidance Rule》Specify " 35kV, 10kV in the 59th article of (execution)
City net, when cable run is more long, system capacitive current is larger, it would however also be possible to employ resistance
Mode ".
Neutral Grounding through Resistance in Electrical is access resistance of being connected between neutral point of electric network and the earth
Device, when there is singlephase earth fault, line-to-ground point produces larger zero-sequence current,
Zero-sequenceprotection acts on tripping operation, cuts off faulty line and trouble point, and quick recovery system is just
Normal running status.Neutral resistor earthed system typically uses star or zigzag star connection
Grounding transformer access power network, resistor access grounding transformer neutral point, resistor
Need to bear in short-term the voltage x current of earth fault, should have corresponding capacity and radiating unit
Part, resistance box needs specially to manufacture and design.Because cable transient fault probability is smaller,
Power network based on cable run generally tends to use Neutral Grounding through Resistance in Electrical, with
Quick excision failure.Due to singlephase earth fault fault resstance and circuit impedance with
Nature of trouble and there is larger difference apart from difference, therefore, Neutral Grounding through Resistance in Electrical mode
It is likely to occur relay fail.
Neutral by arc extinction coil grounding system is typically using star or zigzag star connection
Grounding transformer accesses power network, and arc suppression coil (i.e. variable single-phase electricity sensor) accesses ground connection
Between transformer neutral point and grounded screen.Its general principle is：When power network normally runs,
Grounding transformer neutral point voltage-to-ground is zero, and arc suppression coil electric current is zero；When power network goes out
During existing singlephase earth fault, ungrounded phase voltage is raised, and grounding transformer neutral point is over the ground
Voltage raises (metallic earthing can be increased to phase voltage), and arc suppression coil produces inductance current.
Flow through the inductive current of arc suppression coil and earth-free relatively capacitance current and be stream
The electric current of earth point is crossed, current phase difference 180 degree, mutually compensates on inductance capacitance.
The transient fault ratio of overhead transmission line is very high, using the power network one based on overhead transmission line
As using isolated neutral or through grounding through arc by the way of.But, due to extinguishing arc
Coil and grounding transformer have active loss, it becomes virtually impossible to electric capacity electricity is fully compensated
Stream.In order to avoid resonance, overcompensation is used in usual power distribution network.
Generally need to configure reactive-load compensation equipment in power distribution network, to reduce network losses,
It is now many to be occurred using passive capacitor bank/static reactive power compensation or active static reacance
Device.Harmonic wave in power distribution network is generally filtered using passive or active filter.From reason
By upper, reactive-load compensation, Harmonics elimination, capacitive earth current compensation are all a kind of idle benefits
Technology, existing Power Electronic Technique are repaid it is achieved that can unify to enter according to reactive power
Row compensation.
The content of the invention
(1) technical problem to be solved
Neutral point flexibility present invention aim to address small current neutral grounding system power network connects
Ground and reactive-load compensation problem, realize that a kind of realization possesses various earthing modes and can cut online
The neutral point flexible ground method changed, while it is low by transformer to solve power electronic devices
Pressure winding control high-voltage fence bears high-tension technical problem.
(2) technical scheme
In order to solve the above-mentioned technical problem, the present invention puies forward a kind of power network neutral point flexibility and connects
Ground system, it is characterised in that including：Grounding transformer, power electronic equipment, control
Device and rectification circuit；
Wherein, the first winding of the grounding transformer be linked into the power network bus,
Neutral ground, the Secondary Winding of the grounding transformer is set to the triangular form structure that is open,
The Secondary Winding is linked into the output end of the power electronic equipment, and the controller connects
The power network and the power electronic equipment are connected to, the controller measures the electric power
The voltage and current of the voltage and current of net and the power electronic equipment, and control
Secondary Winding input current from the power electronic equipment to the grounding transformer；It is described
The input of rectification circuit is linked into the power network bus, and output end is linked into described
The input of power electronic equipment, the rectification circuit is also connected to the controller, institute
Stating controller controls the rectification circuit to provide direct current for the power electronic equipment.
Wherein, the iron core of the grounding transformer forms zero sequence fluxes closed-loop path, uses
Any one in three-phase five-limb transformer, shell type transformer or three single-phase transformer groups；
The first winding of the grounding transformer uses star connection, and mutually end is linked into the electric power
Net bus and neutral ground, the grounding transformer Secondary Winding use open-delta
Connection, is linked into the output end of the power electronic equipment.
Wherein, the system also includes rectifier transformer, and the rectifier transformer is once
Winding is connected to the power network bus, and Secondary Winding is connected to the defeated of the rectification circuit
Enter end, and the controller is connected to the rectifier transformer, the controller control
The rectifier transformer provides alternating current for the rectification circuit.
Wherein, the power electronic equipment is inverter, and the inverter is in the control
The converting direct-current power into alternating-current power of input is input to the ground connection transformation under the control of device
Device.
Wherein, the power electronic equipment produces alternating current under the control of the controller
Stream is input to the grounding transformer, and the grounding transformer first winding is injected a current into
Power network and the earth, equivalent power network is through earth neutral system.
Wherein, when there is power network singlephase earth fault, the power electronic equipment is
Controller gathers the voltage and current of the power network, controls the power electronic equipment to produce
Raw alternating current is input to the grounding transformer Secondary Winding, the grounding transformer one
Secondary winding injects capacity current, electric power described in equivalent compensation between non-faulting phase and the earth
The capacitive earth current of the non-faulting phase of net, reduces trouble point earth current, is equivalent to
Neutral by arc extinction coil grounding mode.
Wherein, when there is power network singlephase earth fault, the controller gathers electric power
The electric current of net busbar voltage and the transformer branch, controls the power electronic equipment to produce
Raw alternating current is input to the grounding transformer Secondary Winding, by the ground connection transformation
Device first winding is injected to failure phase line, forms trouble point earth current, produces certain
The zero-sequence current of numerical value, startup separator circuit zero sequence protection act, faulty line breaker
Tripping operation, cuts off faulty line, equivalent Neutral Grounding through Resistance in Electrical mode.
Wherein, when there is power network singlephase earth fault, the controller control is described
Power electronic equipment does not produce alternating current to be input to the grounding transformer, does not influence to match somebody with somebody
Operation of power networks state, simulates isolated neutral mode.
For a kind of power network neutral point flexible ground system, it is characterised in that including：Connect
Ground transformer, power electronic equipment and controller；
(3) beneficial effect
The power network neutral point flexible ground system that the present invention is provided, power electronic equipment connects
In transformer secondary winding be triangular-shaped outlet mode so that power electronic equipment and electric power
Net system primary equipment isolate, it is to avoid cause power electronic devices cause power network short circuit,
Reduce number of devices and cost；Meanwhile, can be by multigroup Secondary Winding and power electronics
Device realizes multiplex, improves power；External direct current power supply is such as set, hence it is evident that improves and mends
Effect is repaid, the compensation error that the active loss of transformer, power electronic equipment causes is overcome；
Additionally, the zero-sequence current of injection can constant current within the specific limits, raising protection act standard
True rate, facilitates relaying configuration.
Brief description of the drawings
Fig. 1 is the circuit structure diagram of power network neutral point flexible ground system of the invention；
Fig. 2 is that the electric current of power network neutral point flexible ground system embodiment of the invention shows
It is intended to；
Fig. 3 is the compensation capacitive earth current phasor diagram of the embodiment of the present invention；
Fig. 4 is the offer zero-sequence current phasor diagram of the embodiment of the present invention；
Fig. 5 is the circuit diagram of the external direct current power supply of an alternative embodiment of the invention；
Fig. 6 is that the circuit structure of the embodiment that current compensation multiplex of the invention is set shows
It is intended to.
Specific embodiment
Specific embodiment of the invention is made further in detail with reference to the accompanying drawings and examples
Description.Following examples are used to illustrate the present invention, but are not limited to the scope of the present invention.
Fig. 1 is the circuit structure diagram of power network neutral point flexible ground system of the invention.
Reference picture 1, the power network neutral point flexible ground compensation system of the embodiment of the present invention,
Specifically include：Grounding transformer 10, power electronic equipment 20, controller 30 and whole
Current circuit 40；
Wherein, the first winding of grounding transformer 10 is respectively connected to power network bus 100
Each phase, the Secondary Winding of grounding transformer 10 is set to be open triangular structure, two
Secondary winding outlet is linked into the output end of power electronic equipment 20, and controller 30 is connected to
Each phase and power electronic equipment 20 of power network bus 100, the measurement electric power of controller 30
The voltage and current of net bus 100 and the voltage in each loop of power electronic equipment 20
And electric current, and the power electronic equipment 20 is controlled to the grounding transformer 10
Secondary Winding input current.The input of rectification circuit 40 is linked into the power network bus
In 100, output end is linked into the input of the power electronic equipment 20, the rectification
Circuit 40 is also connected to the controller 30, and the controller 30 controls the rectified current
Road provides direct current for the power electronic equipment.
In the present embodiment, by using rectification circuit 40, by the alternating current of power network bus
Direct current is converted into for power electronic equipment provides direct current, and adjusts whole by controller
The input of current circuit, such that it is able to reduce the setting of external power source, and improves into electric current
Quality.
In above-described embodiment, grounding transformer 10 can be closed using iron core with zero sequence fluxes
Close loop, including three-phase five-limb transformer, shell type transformer or three single-phase transformers
The transformer group of composition, the first winding of grounding transformer is star-star connection, is connected to institute
State power network bus, neutral ground, the Secondary Winding of the grounding transformer is opening
Delta connection, outlet is connected to the output end of the power electronic equipment.
In addition, system of the invention also includes dc bus 60, the dc bus 60 is
The power electronic equipment provides dc source.
Additionally, the power electronic equipment described in the present embodiment is under the control of the controller
Alternating current is produced to be input to the grounding transformer.
In an embodiment of the present invention, the voltage of power network bus uses voltage transformer pt
Measurement, the electric current of transformer branch is measured using Current Transmit, and then controller is adopted
The current value of the magnitude of voltage summation current transformer of collecting voltage transformer, to power electronic equipment
And rectification circuit is controlled.
Power electronic equipment is accessed power network, side by the present invention by the grounding transformer
Just configuration device protection, improves electric network reliability.
In addition, the power electronic equipment of the present embodiment can be according to the grounding transformer two
Secondary winding parameter optimum choice power electronic devices, reduces number of devices or resistance to pressure request,
Improve economy and reliability, reduces cost.
In the above-described embodiments, power network neutral point flexible ground system can be to power network
With the earth injection controllable current, power network neutral point is equivalent to through arc suppression coil, through resistance
Or earth-free mode, it is possible to the mode of choosing any one kind of them is run or online switchover operation.And
Power electronic equipment injects controllable to grounding transformer Secondary Winding under the control of the controller
Electric current, controllable current injects power network after the grounding transformer first winding is converted
And the earth.
Additionally, when power network normally runs, the controller controls the power electronics dress
Put and inject controllable reactive current or harmonic current to the grounding transformer Secondary Winding, lead to
The grounding transformer injection power network is crossed, reactive-load compensation is realized or is filtered the function of harmonic wave.
In one embodiment, when there is power network singlephase earth fault, power electronics
Device is the electric current that controller gathers power network busbar voltage and the transformer branch, control
Making the power electronic equipment produces alternating current to be input to the grounding transformer, passes through
The grounding transformer first winding compensates power network non-faulting relatively capacitance current, makes
Trouble point earth current reduces, and simulates neutral by arc extinction coil grounding mode.
In another embodiment, when there is power network singlephase earth fault, the control
The electric current of device collection power network busbar voltage processed and the transformer branch, controls the electricity
Power electronic installation produces alternating current to be input to the grounding transformer, by the ground connection
Transformer first winding injects faulty line so that trouble point earth current reaches a fixed number
Value, startup separator circuit zero sequence protection act, faulty line circuit breaker trip, excision event
Barrier circuit, simulates Neutral Grounding through Resistance in Electrical mode.
In yet another embodiment, when there is power network singlephase earth fault, the control
Device processed controls the power electronic equipment not produce alternating current to be input to the ground connection transformation
Device, does not influence running status, simulates isolated neutral mode.
In above-described embodiment, as shown in Fig. 2 when A phases break down ground connection, the electricity
Power electronic installation is to grounding transformer Secondary Winding Injection CurrentWhen, then in first winding three-phase
InduceZero-sequence current, by the neutral ground of grounding transformer, form power network
To earth-return, the electric current for injecting trouble point is
In above-described embodiment, if as shown in figure 3, the electric current of injection Secondary WindingLag behind
90 ° of A phase voltages, then with 180 ° of synthesis capacitive earth current phase difference, injected by adjusting
The amplitude of electric current offsets the capacitance current of trouble point, that is, play the compensating electric capacity function of current, equivalent
Run in neutral by arc extinction coil grounding mode.Now, I should be madea=kIc0, Ic0For single-phase
Capacitive earth current.
In above-described embodiment, if as shown in figure 4, the electric current of injection Secondary WindingWith A
The same phase of phase voltage, then with 90 ° of capacitive earth current phase difference, do not offset capacitive earth current,
Injection trouble point is current in resistance propertyControl Injection Current, you can to control to pass through failure
The zero-sequence current of circuit, so that startup separator circuit zero sequence trip protection, cuts off faulty line,
Neutral Grounding through Resistance in Electrical mode is equivalent to run.Unlike being grounded from neutral resistor, electricity
Power electronics inversion unit active Injection Current can be run in constant-current source mode, not limited by phase voltage
System.Meanwhile, voltage be reduced to the impedance of faulty line and the pressure drop of the earth resistance of trouble point and,
Power consumption is far below Neutral Grounding through Resistance in Electrical mode.
Additionally, in the embodiment of another external direct current power supply, as shown in figure 5, this
The system of invention increased outside rectifier transformer 50, the input for adjusting rectification circuit
Voltage, can overcome the active loss of transformer, power electronic equipment, improve injection electricity
The quality of stream.The first winding of the rectifier transformer 50 is connected to the power network bus
100, Secondary Winding is connected to the input of the rectification circuit 40, and the control
Device 30 is connected to the rectifier transformer 50, and the controller 30 controls the rectification to become
Depressor 50 is that the rectification circuit 40 provides alternating current.In above-described embodiment, due to electricity
The consumed energy very little of power electronic installation, therefore, either dc source or rectified current
Road, the equipment for being required to less capacity is capable of achieving.
In multiplex embodiment of the invention, as shown in fig. 6, grounding transformer sets multiple
Secondary Winding and many set power electronic equipments of connection, share first winding and dc bus, electric current
It is changed into original many times, so as to realize the multiplex of device, easily realizes capacity expansion.
The above is only the preferred embodiment of the present invention, it is noted that for the art
For those of ordinary skill, on the premise of the technology of the present invention principle is not departed from, can also make
Some improvement and modification, these are improved and modification also should be regarded as protection scope of the present invention.
Claims (8)
1. a kind of power network neutral point flexible ground system, it is characterised in that including：Connect
Ground transformer, power electronic equipment, controller and rectification circuit；
Wherein, the first winding of the grounding transformer be linked into the power network bus,
Neutral ground, the Secondary Winding of the grounding transformer is set to the triangular form structure that is open,
The Secondary Winding is linked into the output end of the power electronic equipment, and the controller connects
The power network and the power electronic equipment are connected to, the controller measures the electric power
The voltage and current of the voltage and current of net and the power electronic equipment, and control
Secondary Winding input current from the power electronic equipment to the grounding transformer；It is described
The input of rectification circuit is linked into the power network bus, and output end is linked into described
The input of power electronic equipment, the rectification circuit is also connected to the controller, institute
Stating controller controls the rectification circuit to provide direct current for the power electronic equipment.
2. power network neutral point flexible ground system according to claim 1, it is special
Levy and be, the iron core of the grounding transformer forms zero sequence fluxes closed-loop path, using three
Any one in phase five-limb transformer, shell type transformer or three single-phase transformer groups；
The first winding of the grounding transformer uses star connection, and mutually end is linked into the electric power
Net bus and neutral ground, the grounding transformer Secondary Winding use open-delta
Connection, is linked into the output end of the power electronic equipment.
3. power network neutral point flexible ground system according to claim 1, it is special
Levy and be, the system also include rectifier transformer, the rectifier transformer once around
Group is connected to the power network bus, and Secondary Winding is connected to the input of the rectification circuit
End, and the controller is connected to the rectifier transformer, and the controller controls institute
Rectifier transformer is stated for the rectification circuit provides alternating current.
4. power network neutral point flexible ground system according to claim 1, it is special
Levy and be, the power electronic equipment is inverter, and the inverter is in the controller
Control under the converting direct-current power into alternating-current power of input is input to the grounding transformer.
5. power network neutral point flexible ground system according to claim 1, it is special
Levy and be, the power electronic equipment produces alternating current under the control of the controller
The grounding transformer is input to, the grounding transformer first winding injects a current into electricity
Power net and the earth, equivalent power network is through earth neutral system.
6. power network neutral point flexible ground system according to claim 5, it is special
Levy and be, when there is power network singlephase earth fault, the power electronic equipment is control
Device processed gathers the voltage and current of the power network, controls the power electronic equipment to produce
Alternating current is input to the grounding transformer Secondary Winding, and the grounding transformer is once
Winding injects capacity current, power network described in equivalent compensation between non-faulting phase and the earth
Non-faulting phase capacitive earth current, reduce trouble point earth current, in being equivalent to
Property point is through grounding through arc mode.
7. power network neutral point flexible ground system according to claim 5, it is special
Levy and be, when there is power network singlephase earth fault, the controller gathers power network
The electric current of busbar voltage and the transformer branch, controls the power electronic equipment to produce
Alternating current is input to the grounding transformer Secondary Winding, by the grounding transformer
First winding is injected to failure phase line, forms trouble point earth current, produces a fixed number
The zero-sequence current of value, startup separator circuit zero sequence protection act, faulty line breaker is jumped
Lock, cuts off faulty line, equivalent Neutral Grounding through Resistance in Electrical mode.
8. power network neutral point flexible ground system according to claim 5, it is special
Levy and be, when there is power network singlephase earth fault, the controller controls the electricity
Power electronic installation does not produce alternating current to be input to the grounding transformer, does not influence distribution
Running State, simulates isolated neutral mode.
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| CN201510809388.4A CN106786470B (en) | 2015-11-19 | 2015-11-19 | Flexible grounding system for neutral point of power grid |
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| CN201510809388.4A CN106786470B (en) | 2015-11-19 | 2015-11-19 | Flexible grounding system for neutral point of power grid |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110247377A (en) * | 2019-04-30 | 2019-09-17 | 云南电网有限责任公司电力科学研究院 | A kind of power distribution network intelligence low resistance grounding device and its control method |
| CN110239398A (en) * | 2019-06-20 | 2019-09-17 | 西南交通大学 | A kind of cophase supply traction substation protection for feed line trip method |
| CN111509690A (en) * | 2020-05-11 | 2020-08-07 | 云南电网有限责任公司电力科学研究院 | Ground fault full-compensation system and method for multiplexing reactive compensation |
| CN113036730A (en) * | 2021-04-19 | 2021-06-25 | 福州大学 | Control method of power distribution network single-phase earth fault flexible arc extinction device |
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| CN110239398A (en) * | 2019-06-20 | 2019-09-17 | 西南交通大学 | A kind of cophase supply traction substation protection for feed line trip method |
| CN110239398B (en) * | 2019-06-20 | 2020-12-18 | 西南交通大学 | In-phase power supply traction substation feeder protection tripping method |
| CN111509690A (en) * | 2020-05-11 | 2020-08-07 | 云南电网有限责任公司电力科学研究院 | Ground fault full-compensation system and method for multiplexing reactive compensation |
| CN113036730A (en) * | 2021-04-19 | 2021-06-25 | 福州大学 | Control method of power distribution network single-phase earth fault flexible arc extinction device |
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