CN103887805A - Asymmetric voltage control method of small current grounding system - Google Patents
Asymmetric voltage control method of small current grounding system Download PDFInfo
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- CN103887805A CN103887805A CN201410006023.3A CN201410006023A CN103887805A CN 103887805 A CN103887805 A CN 103887805A CN 201410006023 A CN201410006023 A CN 201410006023A CN 103887805 A CN103887805 A CN 103887805A
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- 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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
Abstract
The invention provides an asymmetric voltage control method of a power system, the neutral point of the system is not grounded or is grounded through an arc suppression coil, and the asymmetric voltage caused by line three-phase parameter unbalance is controlled to close to zero. According to the method, according to the constraint relationship between system asymmetric voltage and power frequency zero sequence current injected through a system neutral point or any phase in three phases, when a system parameter is known, injection current can be directly calculated to control the asymmetric voltage to zero, when the system parameter is unknown, starting from the injection current of arbitrary amplitude and phase, firstly injection current phase is changed, then injection current amplitude is changed, and the asymmetric voltage is close to zero. The method can be adapted to the change of a line parameter structure, the asymmetric voltage of a small current grounding system can be flexibly and effectively controlled, the power grid three-phase voltage balance is maintained, and the safety and economy of power grid operation are improved.
Description
Technical field
The invention belongs to Three-phase Power Systems balance of voltage control field, relate to a kind of asymmetrical voltage control method of small current neutral grounding system.
The invention particularly relates to a kind of active compensation technology control small current neutral grounding system asymmetrical voltage that utilizes and level off to zero control method.
Background technology
China's medium voltage distribution network extensively adopts small current neutral grounding mode, i.e. isolated neutral mode and neutral by arc extinction coil grounding mode.Due to the impact of overhead transmission line manufacturing process, practice of construction and the factor such as transposition is not good, the three-phase ground capacitance of general electrical network is unequal mutually.In addition, it is single-phase load power supply that electrical network adopts the non-full mode of power supply mutually sometimes, and this also can cause the three-phase ground capacitance of power distribution network asymmetric.For the medium voltage distribution network that adopts small current neutral grounding mode, its neutral point can produce the voltage to earth of certain numerical value.In compensated distribution network, the inductance of arc suppression coil and the three-phase ground capacitance of electrical network form voltage resonance loop, also can aggravate neutral point voltage, the equilibrium relation of possible heavy damage three-phase voltage.
Though the imbalance of three-phase voltage being caused by residual voltage this can not affect user's normal power supply, but can cause numerous harm to equipment such as power circuit, transformer, instrument transformer, lightning arresters, light make efficiency and the hydraulic performance decline of electric equipment, heavy make shorten or cause damage accident the useful life of electric equipment, the safety, the economic performance that reduce operation of power networks, must be limited.
Regulation in " overvoltage protection of alternating-current electric device and insulation coordination " (DL T620-1997), compensated distribution network is under normal operation, and the long-time electric voltage displacement of neutral point must not exceed 15% of the specified phase voltage of system.Traditionally, the method for restriction system asymmetrical voltage is mainly circuit transposition, access coupling capacitor and arc suppression coil is tuning and suitably increase its ratio of damping etc.But these methods due to exist difficulty of construction large, need to increase equipment investment and can not adaptable line parameter and the different shortcomings such as the change of structure, can not effectively limit asymmetrical voltage.At present, this field still lack flexibly, effective asymmetrical voltage control method.
Active compensation technology based on active electric power electronic device and pulse modulation technology, carrys out control system residual voltage by injecting zero-sequence current to power distribution network.This technology is existing application in the single phase ground fault extinguishing arc of neutral non-effective grounding power distribution network, and it can compensate for failed point residual flow, raising blow-out probability, and after blow-out, control the resume speed of fault point voltage, prevent arc reignition.Its superior residual voltage control performance provides thinking for seeking new asymmetrical voltage control principle.
Summary of the invention
The technical problem that the present invention solves is: the asymmetrical voltage control technology of small current neutral grounding system.When small current neutral grounding system is because circuit transposition is insufficient, non-full when the reason such as power supply makes the neutral point larger voltage of existence (being asymmetrical voltage) mutually, can flexibly, effectively eliminate system asymmetrical voltage, maintain system three-phase voltage balance.
The technical scheme that technical solution problem of the present invention is taked is: by system neutral or three-phase any one in opposite directions system inject an amplitude, the controlled power frequency zero-sequence current of phase place, control system asymmetrical voltage levels off to zero, maintains system three-phase voltage balance.Process is:
1. in the time that the system of detecting exists asymmetrical voltage, inject initial Injection Current to system immediately
(amplitude is I
1, phase place is
).The system of selection of initial Injection Current:
This initial Injection Current
can be the electric current of any amplitude and phase place, also can be by being manually preset as a certain fixing electric current.In addition, can be derived from the final injection power current of the method for the invention according to theory
for:
In formula,
the asymmetrical voltage of system during for Injection Current not, C
a, C
b, C
cfor system three-phase ground capacitance.Therefore, for thering is the system of measuring three-phase ground capacitance condition, also can be using this calculated value as initial Injection Current
recycling subsequent step is eliminated the error that the aspects such as measurement, calculating cause, and adjusts the time to reduce Injection Current.
2. fixing Injection Current amplitude is I
1change current phase, determine and make system asymmetrical voltage reach local minimum phase place
A. establish counter j=1, (amplitude is I to record initial Injection Current
1, phase place is
) time system asymmetrical voltage U
01;
B. establish counter j=2, keep Injection Current amplitude I
1constant, in phase place
on basis, (be made as with a fixed step size
) increase Injection Current phase place and be
record its corresponding system asymmetrical voltage U
02if, U
02< U
01, record phase place change direction coefficient k=0 and proceed to steps d;
C. keep counter j=2, keep Injection Current amplitude I
1constant, in phase place
on basis with step-length
reduce Injection Current phase place
record its corresponding system asymmetrical voltage U
02if, U
02> U
01proceed to step e, otherwise record current phase place change direction coefficient k=1;
D. counter j adds 1, according to phase place change direction, according to phase step
continue to change phase place
record corresponding system asymmetrical voltage U
0jif, U
0j< U
0 (j-1)return to steps d;
E. determine the phase place that makes system asymmetrical voltage minimum
for:
3. fixing Injection Current phase place
change current amplitude, determine and make system asymmetrical voltage arrive minimum current amplitude I
f:
A. establish counter j=1, recording amplitude is I
1, phase place is
system asymmetrical voltage U corresponding to Injection Current
01;
B. establish counter j=2, keep Injection Current phase place
constant, at amplitude I
1on basis, increase Injection Current amplitude as I taking a fixed step size (being made as Δ I)
2=I
1+ Δ I, records its corresponding system asymmetrical voltage U
02if, U
02< U
01, record amplitude change direction coefficient k=0 and proceed to steps d;
C. keep counter j=2, keep Injection Current phase place
constant, at amplitude I
1on basis, reduce Injection Current amplitude I with step delta I
2=I
1-Δ I, records its corresponding system asymmetrical voltage U
02if, U
02> U
01proceed to step e, otherwise record current amplitude change direction coefficient k=1;
D. counter j adds 1, according to amplitude change direction, continues to change amplitude I according to amplitude step delta I
j=I
(j-1)+ (1)
kΔ I, records corresponding system asymmetrical voltage U
0jif, U
0j< U
0 (j-1)return to steps d;
E. determine the amplitude I that makes system asymmetrical voltage minimum
ffor: I
f=I
(j-1).
4. continue to system Injection Current
(amplitude is I
f, phase place is
), control asymmetrical voltage and level off to 0.If the amplitude of asymmetrical voltage changes, by Injection Current this moment
as initial Injection Current
proceed to step 2.
Compared with prior art the invention has the beneficial effects as follows:
The asymmetric medium voltage distribution network imbalance of three-phase voltage causing of circuit triphase parameter can shorten the useful life of electric equipment, easily causes security incident, must be limited.And the existing method of restriction system asymmetrical voltage is owing to there being various shortcomings, can not flexibly, effectively control asymmetrical voltage: (1) rationally replaces, but large to operating electrical network transposition difficulty, and distribution line unusual fluctuation rate is high, DeGrain; (2) make the suitable off-resonance point operation of arc suppression coil compensation device, or suitably increase its ratio of damping, reduce the aggravation effect of the right title voltage of arc suppression coil, but effect is limited, can not fundamentally eliminate asymmetrical voltage; (3) increase special coupling capacitor, three-phase ground capacitance is equated, but need to increase equipment investment, and in the time that line construction, parameter change, can not change immediately thereupon, may increase the weight of the uneven degree of three-phase voltage.
The small current neutral grounding system asymmetrical voltage control principle that the present invention proposes, progressively adjusts phase place and the amplitude of Injection Current according to the restriction relation of Injection Current and asymmetrical voltage, control asymmetrical voltage levels off to zero.The method of the invention can overcome the various errors that occur in actual motion, accuracy and stability are high, and can adaptable line the change of parameter, structure, in the time that the asymmetric situation of electrical network changes, only need readjust Injection Current, just the three-phase equilibrium state of electrical network can be maintained, economy, security performance and the quality of power supply of electrical network can be conscientiously improved.
Brief description of the drawings
Accompanying drawing 1 be resonant earthed system in the asymmetric situation of a certain specific three-phase ground capacitance, the phase place of different amplitude Injection Currents and the restriction relation of neutral point voltage (system is in the asymmetric situation of different three-phase ground capacitances, and its variation tendency is identical);
Accompanying drawing 2 be resonant earthed system in the asymmetric situation of a certain specific three-phase ground capacitance, the amplitude of out of phase Injection Current and the restriction relation of neutral point voltage (system is in the asymmetric situation of different three-phase ground capacitances, and its variation tendency is identical);
Accompanying drawing 3 is for utilizing the method for the invention control neutral point voltage to level off to 0 oscillogram;
Accompanying drawing 4 is active power compensator system block diagram.
Embodiment
The embodiment of the method for the invention is:
(1) active power compensator
Active full compensate control apparatus forms (as shown in Figure 4) by several parts such as data acquisition system, commutation inversion power supply, filter circuit, place in circuit, control units.Data acquisition system is responsible for gathering and is controlled required every parameters of electric power system, as asymmetrical voltage, three-phase ground capacitance etc., and gives control unit as feedback quantity; Control unit calculates required Injection Current according to algorithm, and exports applicable PWM voltage wave by the conducting of active electric power electronic device in drive circuit control inverter circuit; Filter circuit is responsible for the high fdrequency component in filtering PWM ripple, and the voltage after after filtering provides required Injection Current by suitable place in circuit for system, realizes the control of right title voltage.Active power compensator can or connect afterwards connecting system neutral point in parallel with arc suppression coil, also can be from three-phase any one access that is in parallel or connects.
(2) obtaining of neutral point voltage
The three-phase that neutral point voltage can be connected to by system neutral or zero sequential potential transformer (TV) directly obtain.
(3) initial Injection Current
selection
Initial Injection Current
can be the electric current of any amplitude and phase place, also can be by being manually preset as a certain fixing electric current.In addition, can be derived from the final injection power current of the method for the invention according to theory
for:
In formula,
the asymmetrical voltage of system during for Injection Current not, C
a, C
b, C
cfor system three-phase ground capacitance.In actual motion, when this electric current can utilize not Injection Current, measured asymmetrical voltage and three-phase ground capacitance value calculates, but due to the error of the aspects such as measurement, calculating, this calculated value can exist certain error.Therefore, for thering is the system of measuring three-phase ground capacitance condition, can be using this calculated value as initial Injection Current
recycling the method for the invention is adjusted Injection Current, and the adjusting range that can significantly dwindle like this Injection Current, reduces to adjust required time.
(4) measurement of system three-phase ground capacitance value
To calculate gained Injection Current as initial Injection Current if select, need to record system three-phase ground capacitance value, the general signal injection method that adopts: inject alien frequencies signal to system neutral by microcomputer measuring and controlling device, receive the feedback signal from electrical network simultaneously, according to corresponding equivalent circuit and algorithm, calculate the three-phase ground capacitance value of electrical network.The decanting point of signal injection method can be selected in TV secondary side open delta place at present, or stands with the neutral point of change, Shunt Capacitor Unit ground connection.
(5) control system asymmetrical voltage levels off to zero, maintains three-phase voltage balance
From initial Injection Current
start, first fixing Injection Current amplitude is I
1change current phase, determine and make system asymmetrical voltage reach local minimum phase place
fix again Injection Current phase place
change current amplitude, determine and make system asymmetrical voltage arrive minimum current amplitude I
f; Continue to system Injection Current
(amplitude is I
f, phase place is
), control asymmetrical voltage and level off to 0, if the amplitude of asymmetrical voltage changes, by Injection Current this moment
as initial Injection Current
readjust Injection Current.
The above, be only preferred embodiment of the present invention, is not the restriction of the present invention being made to other form, and any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the equivalent embodiment of equivalent variations.But every technical solution of the present invention content that do not depart from, any simple modification, equivalent variations and the remodeling above embodiment done according to technical spirit of the present invention, still belong to the protection range of technical solution of the present invention.
Claims (5)
1. small current neutral grounding system asymmetrical voltage control method, it is characterized in that: by system neutral or three-phase any one in opposite directions system inject an amplitude, the controlled power frequency zero-sequence current of phase place, control system asymmetrical voltage levels off to zero, maintains system three-phase voltage balance.
2. method according to claim 1, is characterized in that:
(be made as I from any amplitude
1) and phase place (be made as
) initial Injection Current
start, first fixing Injection Current amplitude is I
1change current phase, determine and make system asymmetrical voltage reach local minimum phase place
fixing Injection Current phase place is again
changing current amplitude makes system asymmetrical voltage reach minimum.
3. according to the method described in claim 1 and 2, it is characterized in that:
Fixing Injection Current amplitude changes current phase, determines and makes system asymmetrical voltage reach local minimum phase place
implementation procedure be:
A. establish counter j=1, (amplitude is I to record initial Injection Current
1, phase place is
) time system asymmetrical voltage U
01;
B. establish counter j=2, keep Injection Current amplitude I
1constant, in phase place
on basis, (be made as with a fixed step size
) increase Injection Current phase place and be
record its corresponding system asymmetrical voltage U
02if, U
02< U
01, record phase place change direction coefficient k=0 and proceed to steps d;
C. keep counter j=2, keep Injection Current amplitude I
1constant, in phase place
on basis with step-length
reduce Injection Current phase place
record its corresponding system asymmetrical voltage U
02if, U
02> U
01proceed to step e, otherwise record current phase place change direction coefficient k=1;
D. counter j adds 1, according to phase place change direction, according to phase step
continue to change phase place
record corresponding system asymmetrical voltage U
0jif, U
0j< U
0 (j-1)return to steps d;
E. determine the phase place that makes system asymmetrical voltage minimum
for:
4. according to the method described in claim 1 and 2, it is characterized in that:
Fixing Injection Current phase place
change current amplitude, determine and make system asymmetrical voltage reach minimum current amplitude I
fimplementation procedure be:
A. establish counter j=1, recording amplitude is I
1, phase place is
system asymmetrical voltage U corresponding to Injection Current
01;
B. establish counter j=2, keep Injection Current phase place
constant, at amplitude I
1on basis, increase Injection Current amplitude as I taking a fixed step size (being made as Δ I)
2=I
1+ Δ I, records its corresponding system asymmetrical voltage U
02if, U
02< U
01, record amplitude change direction coefficient k=0 and proceed to steps d;
C. keep counter j=2, keep Injection Current phase place
constant, at amplitude I
1on basis, reduce Injection Current amplitude I with step delta I
2=I
1-Δ I, records its corresponding system asymmetrical voltage U
02if, U
02> U
01proceed to step e, otherwise record current amplitude change direction coefficient k=1;
D. counter j adds 1, according to amplitude change direction, continues to change amplitude I according to amplitude step delta I
j=I
(j-1)+ (1)
kΔ I, records corresponding system asymmetrical voltage U
0jif, U
0j< U
0 (j-1)return to steps d;
E. determine the amplitude I that makes system asymmetrical voltage minimum
ffor: I
f=I
(j-1).
5. according to the method described in claim 1 and 2, it is characterized in that:
The system asymmetrical voltage of making is tending towards 0 final injection power frequency zero-sequence current
for:
In formula,
the asymmetrical voltage of system during for Injection Current not, C
a, C
b, C
cfor system three-phase ground capacitance.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104092228A (en) * | 2014-06-30 | 2014-10-08 | 中国石油大学(华东) | Asymmetric voltage two-point active control method for neutral point non-effective grounding system |
| CN104167749A (en) * | 2014-07-24 | 2014-11-26 | 广东电网公司电力科学研究院 | Inhibition method for three-phase imbalance voltages of power distribution network |
| CN104836219A (en) * | 2015-01-20 | 2015-08-12 | 中国矿业大学 | Variant step arc extinguishing coil tuning new method |
| CN105974173A (en) * | 2015-09-15 | 2016-09-28 | 长沙理工大学 | Current detection method of one-phase inversion grounding device |
| CN106356833A (en) * | 2016-10-12 | 2017-01-25 | 广东电网有限责任公司电力科学研究院 | Power distribution network-based control method for grounding failure suppression device |
| CN107276082A (en) * | 2017-07-05 | 2017-10-20 | 长沙理工大学 | Non-effectively earthed system earth fault is mutually actively depressured method for safe operation |
| CN107508296A (en) * | 2017-07-26 | 2017-12-22 | 国网山东省电力公司莱芜供电公司 | A kind of system and method for the regulating time for reducing control asymmetrical voltage |
| CN110323766A (en) * | 2019-07-19 | 2019-10-11 | 云南电网有限责任公司电力科学研究院 | A kind of low-voltage network imbalance of three-phase voltage governing system and method |
| CN111141991A (en) * | 2018-11-05 | 2020-05-12 | 李景禄 | Method suitable for improving high-resistance grounding fault handling capacity of asymmetric power grid |
| CN111525441A (en) * | 2020-04-30 | 2020-08-11 | 国网湖南省电力有限公司 | Uninterrupted operation method for operation point |
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| CN104092228B (en) * | 2014-06-30 | 2016-04-20 | 中国石油大学(华东) | Asymmetrical voltage 2 active control methods of system with non effectively earth ed neutral |
| CN104092228A (en) * | 2014-06-30 | 2014-10-08 | 中国石油大学(华东) | Asymmetric voltage two-point active control method for neutral point non-effective grounding system |
| CN104167749A (en) * | 2014-07-24 | 2014-11-26 | 广东电网公司电力科学研究院 | Inhibition method for three-phase imbalance voltages of power distribution network |
| CN104167749B (en) * | 2014-07-24 | 2016-05-11 | 广东电网有限责任公司电力科学研究院 | A kind of power distribution network three-phase imbalance voltage inhibition method |
| CN104836219A (en) * | 2015-01-20 | 2015-08-12 | 中国矿业大学 | Variant step arc extinguishing coil tuning new method |
| CN104836219B (en) * | 2015-01-20 | 2018-04-06 | 中国矿业大学 | A kind of arc suppression coil tuning new method of variable step |
| CN105974173A (en) * | 2015-09-15 | 2016-09-28 | 长沙理工大学 | Current detection method of one-phase inversion grounding device |
| CN106356833A (en) * | 2016-10-12 | 2017-01-25 | 广东电网有限责任公司电力科学研究院 | Power distribution network-based control method for grounding failure suppression device |
| CN107276082B (en) * | 2017-07-05 | 2020-10-02 | 长沙理工大学 | Active voltage reduction safe operation method for ground fault phase of non-effective grounding system |
| CN107276082A (en) * | 2017-07-05 | 2017-10-20 | 长沙理工大学 | Non-effectively earthed system earth fault is mutually actively depressured method for safe operation |
| CN107508296A (en) * | 2017-07-26 | 2017-12-22 | 国网山东省电力公司莱芜供电公司 | A kind of system and method for the regulating time for reducing control asymmetrical voltage |
| CN107508296B (en) * | 2017-07-26 | 2020-03-17 | 国网山东省电力公司莱芜供电公司 | System and method for reducing adjustment time for controlling asymmetric voltage |
| CN111141991A (en) * | 2018-11-05 | 2020-05-12 | 李景禄 | Method suitable for improving high-resistance grounding fault handling capacity of asymmetric power grid |
| CN111141991B (en) * | 2018-11-05 | 2021-12-24 | 李景禄 | Method suitable for improving high-resistance grounding fault handling capacity of asymmetric power grid |
| CN110323766A (en) * | 2019-07-19 | 2019-10-11 | 云南电网有限责任公司电力科学研究院 | A kind of low-voltage network imbalance of three-phase voltage governing system and method |
| CN111525441A (en) * | 2020-04-30 | 2020-08-11 | 国网湖南省电力有限公司 | Uninterrupted operation method for operation point |
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