CN103715695A - Intelligent power distribution network neutral point grounding active full-compensation control system - Google Patents
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Abstract
The invention relates to the arc quenching and voltage stabilization technology of a power distribution network neutral point grounding fault point and particularly relates to an intelligent power distribution network neutral point grounding active full-compensation control system. The intelligent power distribution network neutral point grounding active full-compensation control system is characterized in structure by comprising a data acquisition system, a control circuit, a driving circuit, an inversion circuit, a filter circuit, an access circuit and a control power source, wherein a data acquisition end of the data acquisition system is connected with an electric power system, an output end of the data acquisition system is connected with the control circuit, a control output end of the control circuit is respectively connected with the driving circuit and the control power source, and the inversion circuit is connected with an input end of the electric power system respectively through the filter circuit and the access circuit. The system is advantaged in that a voltage recovery open loop and closed loop control method taking a dissonance degree, a damping rate, reactive compensation current and active compensation current as parameters is provided according to analysis, timely self-healing of a fault is guaranteed, moreover, the system voltage can recover to a normal state rapidly.
Description
Technical field
The present invention relates to the blow-out of a kind of power network neutral point earth fault, voltage stabilizing technique, particularly the active full compensation control system of a kind of intelligent distribution network neutral ground.
Background technology
According to statistics, in operation of power networks, more than 95% power-off event is caused by power distribution network.And the single-phase earthing topmost failure mode that is power distribution network, 80% left and right that accounts for fault sum therefore not needing power failure to have great importance to realizing the even seamless self-healing of power grid self-healing when break down.Power network neutral point adopts non-effective earthing mode (to be commonly called as small current neutral grounding mode, mainly comprise traditionally earth-free and through grounding through arc) time, the fault current little (being generally in tens amperes) of single-phase earthing (being commonly called as small current neutral grounding), do not need to excise immediately fault, system can operate with failure a period of time, and that can avoid that short trouble causes perfects line voltage distribution rapid drawdown problem simultaneously.
Neutral point adopts the system blackout that non-effective earthing mode can cause fault to reduce more than 50%.Because fault current is limited, most low current groundings may natural blow-out at fault current zero passage moment electric arc.After blow-out, if the resume speed of electric arc insulation lower than the rate of climb of voltage, fault point breakdown formation intermittent grounding fault again, going round and beginning again finally forms continuous earth fault, and easily causes arc overvoltage; If the super superpotential rate of climb of resume speed of electric arc insulation, fault point electric arc will no longer be restriked, and make system recover normal operation, form instantaneity earth fault, its duration from several cycles to tens of seconds not etc.Wherein instantaneity earth fault does not produce any impact to customer power supply, belongs to seamless self-healing, and generation that simultaneously also can Avoids or reduces arc overvoltage, is the ideal style of single-phase earth fault self-healing.
The earth fault voluntarily target of blow-out can realize by the arc reignition rate that increases fault electric arc blow-out rate and reduce after blow-out.The former can be on the basis of arc suppression coil compensation technology by the power frequency of power electronic technology compensation of ground point electric current, meritorious, idle and harmonic component realizes; The latter can, by the voltage recovery rate of fault phase after control blow-out, realize its resume speed lower than electric arc insulation.In addition, for fear of the damage that perfects phase voltage and raise to line insulation, wish blow-out after system voltage recover as early as possible normally, so there is in realization contradiction, caused or formed permanent fault, or fault self-healing in time and cause operation of power networks to occur destabilizing factor.
Blow-out rate specific to improving system, often adopts by the way of arc suppression coil compensation at present.The adjustment mode of arc suppression coil has manually and is automatic other.Wherein the manual adjustments mode of arc suppression coil can reduce current in the fault point, and error is larger, although regulative mode can further reduce earth point electric current automatically, but still has the electric current of several amperes, also has harmonic current also to can not get compensation.When earth current reaches 5 ampere-hours, electric arc can not natural blow-out.The arc blowout effect of visible arc suppression coil compensation mode can not meet the demands.
For compensated distribution network, fault phase recovery voltage u
rand the pass between system off resonance degree v and ratio of damping d is:
Wherein: U
mfor phase voltage amplitude, ω is power frequency angular frequency.
Therefrom can draw, although traditional arc suppression coil recovers there is certain inhibitory action to voltage, due to system off resonance degree, v is relative with ratio of damping d fixing, and the recovery process of its voltage belongs to system natural characteristic, can not be controlled or be adjusted by other measure.And voltage recovers generally to complete within several cycles, can not give electric arc insulation recovery the reserved sufficient time.During particularly overcompensation amount large (off resonance degree is larger), there will be beat frequency phenomenon, not only voltage recovery time shifts to an earlier date greatly, and the maximum of recovery voltage also will, over normal phase voltage, be unfavorable for electric arc insulation recovery very much.Tradition arc suppression coil is tuning does not revert to main target to suppress voltage yet.
Summary of the invention
The object of the invention is to provides a kind of system voltage resume speed that can effectively control after blow-out according to the deficiencies in the prior art part, guarantee the timely self-healing of fault, simultaneity factor voltage can recover the active full compensation control system of normal intelligent distribution network neutral ground as early as possible.
The object of the invention is to realize by following approach:
The active full compensation control system of intelligent distribution network neutral ground, its structural feature is, includes data acquisition system, control circuit, drive circuit, inverter circuit, filter circuit, place in circuit and control power supply; Wherein the data acquisition end of data acquisition system is connected to electric power system, and output is connected with control circuit, and the control output end of control circuit connects respectively drive circuit and controls power supply; Control power supply and receive the output of three-phase input power, three-phase input power is sequentially connected with inverter circuit by rectified three-phase circuit, DC filtering circuit, and the output of drive circuit is connected with inverter circuit; Inverter circuit is sequentially connected with the input of electric power system with place in circuit by filter circuit.
Data acquisition system gathers operation of power networks parameter from electric power system, comprises real-time voltage, the current information at bus, each place, monitoring point of circuit; Control circuit receives the operation of power networks parameter that data acquisition system is obtained, and in conjunction with the structure and parameter of electric power system, current in the fault point and system voltage are estimated or predicted, finally obtain the voltage of real-time needs compensation, further control drive circuit and drive inverter circuit, to export needed PWM voltage wave (impulse waveform of variable duty ratio).The voltage of inverter circuit comes from the voltage source of three-phase input power after rectified three-phase circuit and DC filtering processing of circuit; The PWM voltage wave of exporting due to inverter circuit passes through after filter circuit filtering higher harmonics high fdrequency component, by place in circuit, electric power system is injected to corresponding offset current, realize the control of voltage to neutral or phase voltage, to guarantee that the resume speed of voltage is lower than the speed of arc extinction, and before this, put the voltage recovery rate that acquisition is the fastest.
Above-mentioned active full compensation control system is to come from following technical Analysis:
During earth fault (under the electric arc conducting state of fault point), system is moved under anancastia, and system voltage determines by nature of trouble, in stable state, its neutral point voltage 0 between phase voltage.After arc extinction disconnects, system loses external constraint, the steady state voltage of its voltage when normally moving and the voltage of concussion naturally between the arc suppression coil inductance in zero sequence loop and line mutual-ground capacitor are formed by stacking, and voltage recovery process depends on system parameters.Fault phase recovery voltage u
rcan approximate representation be:
Wherein: U
mfor phase voltage amplitude, ω is power frequency angular frequency, and v is system off resonance degree, and d is system damping rate.
The corresponding zero initial condition of formula (1) and constant ratio of damping d, off resonance degree v, system voltage recovers normal through 5 cycle left and right the most slowly.Further analysis can draw, the form of recovery voltage (being that dullness is recovered or occurs beat frequency phenomenon) depends primarily on system off resonance degree v, and resume speed depends on system off resonance degree v and ratio of damping d simultaneously, endless recovery time of system voltage when v=d=0 (voltage will maintain ground-fault condition always).This is also the theoretical foundation that recovery voltage is controlled.
First: the relation between system voltage recovery process and reactive power compensation electric current: inject constant reactive current, in the process of recovering at system voltage, change due to capacitive earth current, off resonance degree v also changes thereupon, so the value that adopts initial time off resonance degree v ' changes the reactive current of injection at regular intervals, get the value of determining initial time off resonance degree v ', calculate its corresponding reactive power compensation electric current I
q, computing formula is:
Wherein, I
qfor the reactive current of injecting, v is the original off resonance degree of system, and v ' is the initial time off resonance degree after injecting reactive current.Work as I
qinitial phase while being 90 °, get "+"; Work as I
qinitial phase while being-90 °, get "-" (I
qinitial phase be with respect to neutral point
phase place).When ratio of damping d mono-regularly, reactive current in entirely compensating to the process of undercompensation or overcompensation heighten degree (process that both initial time off resonance degree absolute value increases gradually), recovery time t
rreduce gradually, system voltage resume speed is accelerated.
When reactive current compensates entirely, neutral point voltage u
0with A phase voltage u
aphase angle remain and equate and contrary, along with u
0decay to gradually zero, u
aslowly recover, this voltage recovery process not only the time longer, and the maximum of recovery voltage can not surpass the amplitude of phase voltage, under this state, ground arc is more difficult restrikes.When arc suppression coil off-resonance point moves, the waveform of recovery voltage will change, voltage recovery time also obviously shortens, in recovery process, will there is beat frequency phenomenon, depend primarily on the size of off resonance degree, recovery voltage maximum under this condition may surpass the amplitude of phase voltage, and arrives the peaked time and obviously shorten, and ground arc is also easily restriked.Change the flexible control of reactive power compensation electric current feasible system voltage recovery extent and resume speed.
Ratio of damping is 0% during to 8% variation, and voltage recovery time curve overlaps substantially, and recovery time, difference was less, and reactive power compensation electric current plays a major role to the variation of recovery time; When entirely compensate recovery time about reactive current, the value of reactive current is symmetrical.When reactive power compensation electric current I
qvalue at-1A between 1.2A time, significantly change recovery time with the variation of reactive power compensation electric current.
Relation between system voltage recovery process and meritorious offset current: inject constant active current, in the process of recovering at system voltage, change due to capacitive earth current, ratio of damping d also changes thereupon, therefore adopt the value of initial time ratio of damping d ' by certain hour interval, to change the active current of injection, get the value of determining initial time ratio of damping d ', calculate its accordingly meritorious offset current I
p, computing formula is:
Wherein, I
pfor the active current of injecting, d is the original ratio of damping of system, and d ' is for injecting the initial ratio of damping after active current.Work as I
pinitial phase while being 0 °, get "+"; Work as I
pinitial phase while being 180 °, get "-" (I
pinitial phase be with respect to neutral point
phase place).
Along with the absolute value of off resonance degree increases gradually, voltage recovery time increases with meritorious offset current the trend reducing and weakens gradually, and after the absolute value of off resonance degree increases to a certain degree, voltage recovery time variation tendency is very little, is tending towards constant.Absolute value as off resonance degree v | v|≤5%, I
pduring <0.1A, recovery time is along with active current I
preduce and significantly increase; When | during v|>=10%, along with active current I
pchange, the trend changing recovery time weakens.Can find out thus, when off resonance degree absolute value is little, meritorious offset current and reactive power compensation electric current joint effect the variation characteristic of recovery time, and when the absolute value of off resonance degree increases, reactive power compensation electric current is on the impact of recovery time dominate gradually, and meritorious offset current weakens gradually on the impact of recovery time.
The present invention proposes to take according to above-mentioned analysis the voltage that off resonance degree and ratio of damping, reactive power compensation electric current and meritorious offset current are parameter and recovers Open loop and closed loop control method.Need to be for different electric pressures, different system structure, different faults position (fault point is positioned at overhead transmission line, cable line and is still positioned at power consumption equipment), different faults electric current, according to historical data analysis, add up electric arc insulation recovery rule and fault point electric arc insulation recovery process is carried out to dynamic monitoring, determine on this basis the suitable speed that system voltage recovers, guaranteeing on the basis that electric arc can not be restriked, to recover as early as possible normal condition.
The present invention can further be specially:
Described inverter circuit is a kind of biswitch type circuit, and main switching device is igbt, and itself and fly-wheel diode also connect and be integrated into bipolar transistor module.
Inverter circuit is direct current to be changed into the Key Circuit of voltage wave, and its precision and speed have directly determined precision and the speed of whole control system.Described fly-wheel diode, for the protection of igbt (IGBT), prevents that current break from causing damage to it.The voltage quota of main switch and fly-wheel diode is generally got 2-3 times of its rated operational voltage.
Also include buffer circuit, it is arranged in inverter circuit, is RCD buffer circuit.
RCD buffer circuit adopts energy consumption formula voltage turn-off type buffer.The reason that IGBT damages is mainly divided into over-current shock and overvoltage is impacted, and short-circuit protection can suppress over-current shock, and the protection that overvoltage is impacted is mainly to be completed by buffer circuit.The generation that overvoltage is impacted is because IGBT switching speed is very high, when IGBT turn-offs or fly-wheel diode oppositely recovers, produces very high di/dt, causes thus surge voltage on loop inductance.Therefore, in loop, increasing the impact of buffer circuit absorption overvoltage is very important.
Drive circuit is a kind of isolated drive circuit, or is integrated device isolated drive circuit, or is photoelectric coupling isolated drive circuit.
Described integrated device isolated drive circuit refers to and utilizes power electronics integrated device to carry out isolation drive; its drive circuit signal delay is very little, is applicable to work in the switching circuit up to tens kHz, and inside is integrated with overcurrent protection and fault low speed cuts off logic; working power is low, and application is convenient.Described photoelectric coupling isolated drive circuit adopts the mode of dual power supply, owing to there being negative voltage to be added between the grid emitter-base bandgap grading of IGBT, has improved the turn-off speed of IGBT, and can reliable turn-off.
Described filter circuit is LC passive filter.
The PWM ripple of commutation inversion power supply output not only exists a large amount of high order harmonic components to pollute electrical network, and its too high dv/dt easily produces overvoltage through the reflection of long cable, therefore must select suitable filter PWM ripple to be become to the sine wave of standard of comparison.Active filter is because price is high, and the application of the shortcoming of operation maintenance inconvenience is few, and passive filter is still most popular harmonic suppression apparatus at present.
Described place in circuit is a kind of place in circuit in parallel, and it comprises isolating transformer and inductance L
2, inductance L
2be connected on isolating transformer primary side, and be connected in parallel with the earthed circuit of system, the secondary side of isolating transformer connects filter circuit.
On the basis of original arc suppression coil, a branch road in parallel comes to transformer neutral point Injection Current.PWM voltage wave, after LC filter circuit, becomes the sinusoidal voltage ripple of standard of comparison, after transformer boosts, with neutral point voltage U
0acting in conjunction is in L
2upper, both voltage differences are at L
2upper generation current I
2, amplitude and the phase place of control PWM voltage wave, just can control I
2amplitude and phase place, when earth resistance is very little, I
2mainly from earth point, flow through, control I
2with the earth current equal and opposite in direction that will compensate, opposite direction, just can be grounded the full compensation of electric current.
Described place in circuit is a kind of series connection place in circuit, is specially a kind of transformer, and its primary side is connected in system earth circuit, and secondary side connects filter circuit.
Described earthed circuit comprises arc suppression coil L1 and the resistance R 1 being connected in parallel.On the basis of original arc suppression coil, the branch road of having connected comes to transformer neutral point Injection Current.PWM voltage wave, after LC filter circuit, becomes the sinusoidal voltage ripple of standard of comparison, acts on L1 upper, the upper generation current I of L1 after transformer boosts
1, amplitude and the phase place of control PWM voltage wave, just can control I
1amplitude and phase place, when earth resistance is very little, I
1mainly from earth point, flow through, control I
1with the earth current equal and opposite in direction that will compensate, opposite direction, just can be grounded the full compensation of electric current.
The invention provides the active full compensation control system of a kind of intelligent distribution network neutral ground, by gathering the real time execution parameter of electric power system, obtain bucking voltage ripple, and adopt the treatment circuits such as control circuit, inverter circuit and rectification, filtering electrical network to be carried out to the real-time control of active full compensation, can effectively control the system voltage resume speed after blow-out, guarantee the timely self-healing of fault, it is normal that simultaneity factor voltage can recover as early as possible.
Accompanying drawing explanation
Figure 1 shows that the structural representation of the active full compensation control system of intelligent distribution network neutral ground of the present invention.
Figure 2 shows that the electrical block diagram of rectification circuit of the present invention and inverter circuit.
Figure 3 shows that the structural representation of photoelectric coupling isolated drive circuit of the present invention.
Figure 4 shows that the structural representation of parallel place in circuit of the present invention.
Figure 5 shows that the structural representation of tandem place in circuit of the present invention.
Embodiment
Most preferred embodiment:
With reference to accompanying drawing 1, the active full compensation control system of intelligent distribution network neutral ground, includes data acquisition system, control circuit, drive circuit, inverter circuit, filter circuit, place in circuit and control power supply; Wherein the data acquisition end of data acquisition system is connected to electric power system, and output is connected with control circuit, and the control output end of control circuit connects respectively drive circuit and controls power supply; Control power supply and receive the output of three-phase input power, three-phase input power is sequentially connected with inverter circuit by rectified three-phase circuit, DC filtering circuit, and the output of drive circuit is connected with inverter circuit; Inverter circuit is sequentially connected with the input of electric power system with place in circuit by filter circuit.Between rectified three-phase circuit and DC filtering circuit, be serially connected with the current-limiting resistance that powers on.
Data acquisition system is responsible for gathering the operational factor of electric power system, then by certain algorithm, calculate the inverter voltage that inverter circuit will be exported, control circuit output control pulse, by drive circuit, drive the conducting of IGBT in inverter circuit to export suitable PWM voltage wave, PWM ripple contains larger high order harmonic component, must after filter circuit filters out high fdrequency component, just can be incorporated to electric power system.Filtered voltage, through suitable place in circuit, injects suitable offset current to electric power system, realizes the control of voltage to neutral or phase voltage.
Wherein, the I/O part of rectified three-phase circuit, DC filtering circuit, control power supply and control circuit, because its technology is very ripe, will not be discussed in literary composition.
By the electrical block diagram of rectified three-phase circuit, DC filtering circuit, power on current-limiting resistance and inverter circuit referring to accompanying drawing 2, described inverter circuit is a kind of biswitch type circuit, main switching device is insulated gate bipolar transistor IGBT, itself and fly-wheel diode also connect and are integrated into bipolar transistor module and (in figure, be denoted as 1,2,3,4 parts).
While selecting the model of IGBT, Main Basis is voltage quota and electric current quota.The rated operational voltage that for example adopted is DC514V, and the voltage quota of main switch and fly-wheel diode is generally got 2-3 times of its rated operational voltage, because the withstand voltage of its IGBT must be more than 1000V.Maximum current I due to its output
nbe about 10A * 20=200A, consider certain nargin, the effective value electric current of IGBT quota (being on state current) is I
srms=(1.2～1.4) I
n, generally get 250A left and right.
Drive circuit adopts photoelectric coupling isolated drive circuit, sees accompanying drawing 3, adopts the mode of dual power supply.When Us makes light-emitting diode have electric current to flow through, the triode conducting of photoelectrical coupler HU, on R1, there is electric current to flow through, field effect transistor T1 turn-offs, under the effect of VC, through base stage and the emitter of resistance R 2, T2 pipe, there is bias current, the rapid conducting of T2, through RG resistance, the IGBT in inverter circuit obtains positively biased and conducting.When VG does not have pulse voltage, light-emitting diode is not luminous, and mechanism is contrary, and T1 conducting makes T3 conducting, and-Vc is added between the grid emitter-base bandgap grading of IGBT through resistance RG, and IGBT is turn-offed rapidly.This kind of dual power supply mode, owing to there being negative voltage to be added between the grid emitter-base bandgap grading of IGBT, has improved the turn-off speed of IGBT, and can reliable turn-off.
Filter circuit adopts LC passive filter, the PWM ripple with the output of nonsymmetrical rule sampling method is carried out to filtering high-frequency harmonic, and become the sine wave of standard of comparison, and modulation system is Sine Wave Pulse Width Modulation mode (SPWM).When the parameter of L, C is chosen, L at least can bear 0.1U
mvoltage and can bear 1.1I
melectric current.C at least can bear 1.1U
mvoltage and can bear 0.1I
melectric current.Guarantee that filter effect is primary, reduces C
0electric current be deputy, L
0on pressure drop generally little, even larger, also can guarantee filtered voltage conforms requirement by improving output voltage, and L
0largerly be conducive to improve filter effect, it is strong that the ability that inductance bears pressure drop is generally born the ability of electric current than electric capacity.
Place in circuit of the present invention provides two kinds of different modes, and a kind of is place in circuit in parallel, and a kind of is series connection place in circuit, specifically describes as follows:
With reference to accompanying drawing 4, place in circuit in parallel comprises isolating transformer and inductance L
2, inductance L
2be connected on isolating transformer primary side, and be connected in parallel with the earthed circuit of system, the secondary side of isolating transformer connects filter circuit.
With reference to accompanying drawing 5, series connection place in circuit is specially a kind of transformer, and its primary side is connected in system earth circuit, and secondary side connects filter circuit.The principle of two kinds of circuit is shown in summary of the invention part.
Earth current when verifying that active full compensating controller can inject constant electric current and changes from single phase ground fault to electrical network is 0(or very little thereby make earth current) impel earth point blow-out, utilize MATLAB software to carry out simulating, verifying.In test, know:
When injecting suitable electric current to neutral point, can change the voltage of neutral point, and then change each phase voltage.Reliable blow-out when making earth fault occurs, requiring fault phase voltage is 0, namely under the following conditions:
Test has also confirmed to make by oneself active full compensation arrangement can export constant current reliably, and two kinds of places in circuit can meet the demands.The relational expression of exporting constant current with voltage source inverter is:
Parallel way:
Series system:
It is same as the prior art that the present invention does not state part.
Claims (7)
1. the active full compensation control system of intelligent distribution network neutral ground, is characterized in that, includes data acquisition system, control circuit, drive circuit, inverter circuit, filter circuit, place in circuit and control power supply; Wherein the data acquisition end of data acquisition system is connected to electric power system, and output is connected with control circuit, and the control output end of control circuit connects respectively drive circuit and controls power supply; Control power supply and receive the output of three-phase input power, three-phase input power is sequentially connected with inverter circuit by rectified three-phase circuit, DC filtering circuit, and the output of drive circuit is connected with inverter circuit; Inverter circuit is sequentially connected with the input of electric power system with place in circuit by filter circuit.
2. the active full compensation control system of intelligent distribution network neutral ground according to claim 1, it is characterized in that, described inverter circuit is a kind of biswitch type circuit, and main switching device is igbt, and itself and fly-wheel diode also connect and be integrated into bipolar transistor module.
3. the active full compensation control system of intelligent distribution network neutral ground according to claim 1, is characterized in that, also include buffer circuit, it is arranged in inverter circuit, is RCD buffer circuit.
4. the active full compensation control system of intelligent distribution network neutral ground according to claim 1, is characterized in that, drive circuit is a kind of isolated drive circuit, or is integrated device isolated drive circuit, or is photoelectric coupling isolated drive circuit.
5. the active full compensation control system of intelligent distribution network neutral ground according to claim 1, is characterized in that, described filter circuit is LC passive filter.
6. the active full compensation control system of intelligent distribution network neutral ground according to claim 1, is characterized in that, described place in circuit is a kind of place in circuit in parallel, and it comprises isolating transformer and inductance L
2, inductance L
2be connected on isolating transformer primary side, and be connected in parallel with the earthed circuit of system, the secondary side of isolating transformer connects filter circuit.
7. the active full compensation control system of intelligent distribution network neutral ground according to claim 1, it is characterized in that, described place in circuit is a kind of series connection place in circuit, is specially a kind of transformer, its primary side is connected in system earth circuit, and secondary side connects filter circuit.
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| CN108023345A (en) * | 2017-10-27 | 2018-05-11 | 长沙理工大学 | A kind of active arc-extinction device voltage control method of power distribution network |
| CN109765463A (en) * | 2019-03-29 | 2019-05-17 | 云南电网有限责任公司电力科学研究院 | A kind of ground fault disappearance method of discrimination of controllable voltage compensation way |
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| CN108023345B (en) * | 2017-10-27 | 2020-03-13 | 长沙理工大学 | Voltage control method for power distribution network active arc suppression device |
| CN109765463A (en) * | 2019-03-29 | 2019-05-17 | 云南电网有限责任公司电力科学研究院 | A kind of ground fault disappearance method of discrimination of controllable voltage compensation way |
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| CN111289802B (en) * | 2020-01-10 | 2023-05-30 | 中国石油大学(华东) | Method for measuring capacitance current to ground of resonant grounding system |
| CN111505440A (en) * | 2020-04-27 | 2020-08-07 | 云南拓普特种电源科技有限公司 | Ground fault detection and protection system and method based on class D power amplifier |
| 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 |
| CN111856207A (en) * | 2020-06-30 | 2020-10-30 | 国网河南省电力公司电力科学研究院 | Resonance grounding fault processing method for power distribution network |
| CN112748366A (en) * | 2021-02-07 | 2021-05-04 | 石家庄科林电气股份有限公司 | Method for judging short-circuit fault of transient recording type fault indicator |
| CN112748366B (en) * | 2021-02-07 | 2022-08-12 | 石家庄科林电气股份有限公司 | Method for judging short-circuit fault of transient recording type fault indicator |
| CN113514727A (en) * | 2021-04-16 | 2021-10-19 | 广东电网有限责任公司电力科学研究院 | Power grid fault arc quenching assessment method, device, equipment and storage medium |
| CN114285009A (en) * | 2021-12-14 | 2022-04-05 | 国网江苏省电力有限公司常州供电分公司 | Active voltage arc extinction method based on neutral point injection current |
| CN114285009B (en) * | 2021-12-14 | 2023-11-24 | 国网江苏省电力有限公司常州供电分公司 | Active voltage arc extinction method based on neutral point injection current |
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