CN106329508A - Fuzzy tuning system of resonance grounding power grid - Google Patents
Fuzzy tuning system of resonance grounding power grid Download PDFInfo
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- CN106329508A CN106329508A CN201510337097.XA CN201510337097A CN106329508A CN 106329508 A CN106329508 A CN 106329508A CN 201510337097 A CN201510337097 A CN 201510337097A CN 106329508 A CN106329508 A CN 106329508A
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Abstract
The present invention relates to a fuzzy tuning system of a resonance grounding power grid. The system comprises an inductance regulation module, an out-of-resonance degree measurement module, a fuzzy tuning module and an execution mechanism. A power grid neutral point is grounded via the inductance regulation module, the inductance regulation module is connected with the out-of-resonance degree measurement module, and the out-of-resonance degree measurement module sends a square wave signal to the inductance regulation module; the inductance regulation module samples two voltage signals to the out-of-resonance degree measurement module, the output of the out-of-resonance degree measurement module is connected with the fuzzy tuning module, the output of the fuzzy tuning module is connected with the execution mechanism, and the execution mechanism is connected with the inductance regulation module. The fuzzy tuning system of the resonance grounding power grid needs simple devices, is easy to operate, is rapid in system response, measures an out-of-resonance degree directly, does not need other parameters, has an out-of-resonance degree measurement error not more than 0.64% and the system response time not more than 20 seconds, and has a very good real-time performance and a higher control precision.
Description
Technical field
Technical scheme relates to the fuzzy tuning system of the automatic tuning of turn-adjusting arc-extinguishing winding, specially resonance grounding net
System.
Background technology
Neutral by arc extinction coil grounding, also makes resonance grounding, this earthing mode generally exist in China's medium voltage distribution network.
When electrical network generation singlephase earth fault, arc suppression coil originally can provide corresponding inductive current as inductive load, now provides
The capacity current that electrical network three-phase transmission line direct-to-ground capacitance produces can be compensated by inductive current, makes ground connection residual flow reduce, the most also
The voltage making fault phase ground arc two ends reduces rapidly, makes arc extinction.
The implication of tuning is the degree of the tuning-off degree v sign off-resonance state of regulation arc suppression coil, can be used to describe arc blowout wire
The degree of compensation of circle.The arc suppression coil that China uses at present is substantially manual turn-adjusting, owing to this arc suppression coil is that no-load is adjusted
Joint, must be out of service during regulation, it is inconvenient for, makes coil inductance be difficult in time to follow the tracks of the change of electric network capacitance and current,
Arc suppression coil can not operate in optimal gear, brings hidden danger to the safe operation of electrical network.Use the benefit of manual shift type arc-extinction coil
When repaying electrical network generation singlephase earth fault, only 60% does not develop into phase fault, i.e. compensates effectiveness and is about 0.6, and manually
Operation element is loaded down with trivial details, is sometimes difficult to be tuned timely and accurately, it is achieved that arc-extinguishing coil automatic tuning is highly desirable to.But
It is that turn-adjusting arc-extinguishing winding itself can not realize continuous tuning, therefore, the most existing automatic system for realizing precision tuning
System is not properly suited for turn-adjusting arc-extinguishing winding, if to realize the tuning of this kind of arc suppression coil by precision tuning system, then needs
Increase an aid decision link to be adjusted by arc suppression coil to which gear with decision actually, thus reduce the real-time of system.
Summary of the invention
The technical problem to be solved is: provide the fuzzy tuning system of a kind of resonance grounding net, current for China
Turn-adjusting arc-extinguishing winding tuning stay in the present situation in manual tuning stage more, complete on the basis of electrical network tuning-off degree measures, leading to
Cross after lookup arc suppression coil fuzzy controller status poll table obtains tuning scheme accordingly and act on arc suppression coil, reach arc blowout wire
The purpose of the fuzzy tuning of circle.
The present invention solves the technical scheme that this technical problem used: the fuzzy tuning system of resonance grounding net, this system bag
Include tune sense module, tuning-off degree measurement module, fuzzy tuner module, actuator four part；Neutral point of electric network connects through adjusting sense module
Ground, adjusts sense module to be connected with tuning-off degree measurement module, and tuning-off degree measurement module, to adjusting sense module to send a square-wave signal, adjusts sense
Two voltage signals are then sampled to tuning-off degree measurement module by module, and the output of tuning-off degree measurement module is connected with fuzzy tuner module,
The output of fuzzy tuner module is connected with actuator, and actuator is connected with adjusting sense module；Described tune sense module is disappeared by turn-adjusting
Arc coil and damping resistance composition, both are series relationship, and electrical network main transformer side is star-like connection or triangle connection, when for star-like
During connection, turn-adjusting arc-extinguishing winding can be directly mounted on neutral point of electric network；When electrical network main transformer side is triangle connection, then warp
Cross Z-type grounding transformer and draw neutral point of electric network；Described tuning-off degree measurement module is made up of the device that oscillograph is identical with two-way, often
Road device includes operational amplifier, active band stop filter, photoisolator and Schmidt trigger；The connection of every road device is closed
System is: operational amplifier is connected with active band stop filter, and active band stop filter is connected with photoisolator, photoisolator
Output be connected with Schmidt trigger；The output of two-way Schmidt trigger is connected with oscillograph；Described fuzzy tuner module is i.e.
Arc suppression coil fuzzy controller, this fuzzy controller is a speech path controller.It is calculated by Intel P43.4E Industry Control
Machine realizes, and sets up fuzzy controller status poll table, and be stored in computer under off-line state；Described actuator
It is made up of multichannel loaded switch and damping resistance short circuit control circuit.
Fuzzy tuning flow chart is:
(1) setting of system initialization → carry out preset value → judge that whether singlephase earth fault occurs → neutral-point displacement electricity
Pressure U070% → the singlephase earth fault meeting or exceeding power supply phase voltage U occurs, system entrance failsafe state → short
Connect damping resistance, after fault terminates → again put into damping resistance → return to init state.
(2) if there is not earth fault → recorded electrical network real-time tuning-off degree v by tuning-off degree measurement module1→ judge whether
If in allowed band → and in allowed band, return to init state, it is not necessary to regulation；If not in allowed band, the most right
Arc suppression coil low-pressure side magnitude of voltage, current value measure → calculate arc suppression coil inductive current, electrical network three-phase transmission line over the ground
If capacitance current, ground connection residual flow → residual flow are out-of-limit, then search fuzzy controller status poll table, determine the optimal of arc suppression coil
If gear → do not have out-of-limit by the switching → residual flow between the 15 different gears of road loaded switch realization, return to initialize shape
Whether state, rejudge the system failure, repeats said process.
The fuzzy tuning system of above-mentioned resonance grounding net, involved equipment, components and parts and attaching method thereof are all this technology
Known to the technical staff in field, can be by being purchased or approach acquisition known to other.
Having the beneficial effect that of the fuzzy tuning system of resonance grounding net of the present invention
Residual voltage i.e. neutral point of electric network displacement voltage can directly be carried out in real time by the fuzzy tuning system of resonance grounding net of the present invention
Measure, and send the square-wave signal that a series of frequency is different, resonance grounding net is performed a scan, so that it is determined that electrical network
The natural frequency of vibration, calculates current tuning-off degree value, and tuning-off degree measurement error is not more than 0.64%, and system response time is not more than 20s,
Test speed is fast, and measurement result is accurate, and control accuracy is high, has preferable real-time, has ensured the safe operation of electrical network；This
Invent on the basis of completing the measurement of electrical network tuning-off degree, carry out fuzzy tuning by searching fuzzy controller status poll table, determine
The optimal gear of arc suppression coil.
Accompanying drawing illustrates:
The present invention is further described with embodiment below in conjunction with the accompanying drawings.
Fig. 1 be resonance grounding net of the present invention fuzzy tuning system in tuning-off degree fuzzy tuning system construction drawing.
Fig. 2 be resonance grounding net of the present invention fuzzy tuning system in tuning-off degree measurement module structure chart.
Fig. 3 be resonance grounding net of the present invention fuzzy tuning system in Active filter figure.
Fig. 4 be resonance grounding net of the present invention fuzzy tuning system in fuzzy tuning flow chart.
In figure, 1. adjust sense module, 2. tuning-off degree measurement module, 3. obscure tuner module, 4. actuator, 2-1. operation amplifier
Device, 2-2. active band stop filter, 2-3. photoisolator, 2-4 Schmidt trigger, the double track electron oscillograph of 2-5.
Detailed description of the invention:
Embodiment illustrated in fig. 1 shows, the composition of the fuzzy tuning system of resonance grounding net of the present invention includes adjusting sense module 1, de-humorous
Degree measurement module 2, fuzzy tuner module 3, actuator 4 totally four part.Neutral point of electric network feels ground connection after module 1 is connected with adjusting,
Adjusting sense module 1 to be connected with tuning-off degree measurement module 2, the output of tuning-off degree measurement module 2 is connected with fuzzy tuner module 3, fuzzy tune
Humorous module 3 is connected with actuator 4, and actuator 4 is connected with adjusting sense module 1.
In the fuzzy tuning system of resonance grounding net of the present invention, detailed process is: tuning-off degree measurement module 2 sends to tune sense module 1
One square-wave signal Us, this square-wave signal passes through an a current-limiting resistance R and sample resistance RQIt is connected to adjust in sense module 1 and adjusts
The low-pressure side of circle formula arc suppression coil transformator, adjusts sense module 1 then by the voltage U on two voltage signal-sample resistancesRQWith tune circle
Formula arc suppression coil step down side voltage sampling to tuning-off degree measurement module 2,
Embodiment illustrated in fig. 2 shows, in the fuzzy tuning system of resonance grounding net of the present invention, tuning-off degree measurement module 2 includes by one
The double device composition identical with two-way for track electron oscillograph 2-5 of individual SR-8 type, every road device includes operational amplifier 2-1, active band
Resistance wave filter 2-2, photoisolator 2-3 and Schmidt trigger 2-4；The annexation of every road device is: operational amplifier 2-1
Being connected with active band stop filter 2-2, active band stop filter 2-2 is connected with photoisolator 2-3, and photoisolator 2-3's is defeated
Go out and be connected with Schmidt trigger 2-4；The output of two-way Schmidt trigger 2-4 is connected with oscillograph 2-5.
The measurement process of earthing electric network tuning-off degree is as follows:
Tuning-off degree measurement module 2 sends a square-wave signal U to tune sense module 1s, frequency is from 30HzTo 80HzAutomatically change, with 0.1Hz
Step value be scanned.By the voltage U on sample resistanceRWith turn-adjusting arc-extinguishing winding step down side voltage ULSend respectively
Enter operational amplifier 2-1, carry out " squared " shaping for the first time, then respectively through active band stop filter 2-2, filter mark
Quasi-power frequency component, is then carried out Phototube Coupling by photoisolator 2-3, and a shaping does not often reach preferable effect, thus logical
Cross Schmidt trigger 2-4 and carry out second time " squared " shaping, finally send into oscillograph 2-5 and carry out phase analysis.When two
When voltage-phase is identical, now the frequency of square-wave signal is the electrical network natural frequency of vibration, now, according toTry to achieve electrical network
Current tuning-off degree, wherein, v is electrical network tuning-off degree, f0For the electrical network natural frequency of vibration, f is standard power frequency 50HZ。
Embodiment illustrated in fig. 3 shows, active in tuning-off degree measurement module 2 in the fuzzy tuning system of resonance grounding net of the present invention
Band elimination filter 2-2 is by operational amplifier MC1458, electric capacity, inductance, resistance R*With the other three substitutional resistance R1、R2And R3Composition,
Inductance is produced by gyroscope.Concrete annexation is: input signal is added to resistance R*On, resistance R*Respectively with resistance R2, electric capacity
One end is connected, resistance R2The other end be connected respectively to resistance R1And operational amplifier, the other end of electric capacity is connected with inductance one end,
Inductance other end ground connection, resistance R1The other end is connected with operational amplifier, resistance R3One end is connected with operational amplifier, one end ground connection.
Wherein gyroscope is a common two-port component, is used for realizing the exchange of inductance and electric capacity, is known in the art, has
Inductance in source filter 2-2 is i.e. produced by gyroscope.
Embodiment illustrated in fig. 4 shows, fuzzy tuning flow chart in the fuzzy tuning system of resonance grounding net of the present invention；Obtain electrical network
Tuning-off degree in real time, carries out fuzzy tuning to tuning-off degree, and fuzzy tuning flow chart is: system initialization, carries out the setting of preset value,
Neutral point displacement voltage U0When meeting or exceeding 70% condition establishment of power supply phase voltage U, singlephase earth fault occurs, and system is entered
Enter failsafe state, rapid short circuit damping resistance, after fault terminates, again put into damping resistance, return to init state；
Neutral point displacement voltage U0Meet or exceed 70% condition of power supply phase voltage U when being false, tuning-off degree measurement module record electricity
Net real-time tuning-off degree v1；v1In allowed band, condition is set up, and returns to init state, it is not necessary to regulation, v1In allowed band
Condition is false, then measure arc suppression coil low-pressure side magnitude of voltage, current value, then calculate arc suppression coil inductive current,
Electrical network three-phase transmission line capacitive earth current, ground connection residual flow.If residual flow is out-of-limit, then search fuzzy controller status poll table,
Determine the optimal gear of arc suppression coil, realize the switching between different gear by 15 road loaded switch, if residual flow does not has out-of-limit,
Return to init state, whether rejudge the system failure, repeat said process.
Embodiment 1:
Fuzzy tuner module 3 i.e. arc suppression coil fuzzy controller, this fuzzy controller is a speech path controller, passes through Intel
P43.4E industrial control computer realizes, and carries out actual electric network tuning-off degree value intermittent scanning and shows procedural information, i.e. extinguishing arc
Coil inductance electric current, electrical network three-phase transmission line capacitive earth current, ground connection residual flow.This fuzzy controller is surveyed with electrical network tuning-off degree
The difference of value and set-point, as input, with arc suppression coil inductive current variable quantity for output, sets up fuzzy control under off-line state
Device status poll table, this table is pre-stored within computer, can determine that the optimal gear of arc suppression coil according to different tuning-off degree values.
Actuator 4 is made up of 15 road loaded switch and damping resistance short circuit control circuit.15 road loaded switch are used for regulating turn-adjusting
The different gears of arc suppression coil.Damping resistance plays the effect that containment neutral point displacement voltage is too high when electrical network is properly functioning, works as electricity
When there is singlephase earth fault in net, damping resistance short circuit control circuit rapid short circuit damping resistance.
Operational amplifier model in tuning-off degree measurement module 2 is MC1458, and Schmidt trigger model is 74LS14.Adjust sense module
1 is composed in series by turn-adjusting arc-extinguishing winding and damping resistance.The present invention uses 50A/25A gear electric current, IL=29.2A, 15 points
The arc suppression coil of joint, with voltage transformer pt summation current transformer CT, centering point displacement voltage U in arc suppression coil0With disappear
Arc coil inductive current ILMeasure.Damping resistance occurrence is according to the inductance value of turn-adjusting arc-extinguishing winding and electrical network three-phase transmission
Line direct-to-ground capacitance is obtained.Square-wave signal Us, constant amplitude is 300V, and frequency is from 30～80HZAutomatically changing, sample resistance is 300
Ω/300W, current-limiting resistance is 1 Ω/5W.Electrical network main transformer side is star-like connection or triangle connection, when for star-like connection, adjusts circle
Formula arc suppression coil can be directly mounted on neutral point of electric network；When electrical network main transformer side is triangle connection, then through Z-type ground connection transformation
Neutral point of electric network drawn by device.
The measurement process of electrical network tuning-off degree is as follows:
Tuning-off degree measurement module 2 sends a square-wave signal U to tune sense module 1s, frequency is from 30HzTo 80HzAutomatically change, with 0.1Hz
Step value be scanned.By the voltage U on sample resistanceRWith turn-adjusting arc-extinguishing winding step down side voltage ULSend respectively
Enter operational amplifier 2-1, carry out " squared " shaping for the first time, then respectively through active band stop filter 2-2, filter mark
Quasi-power frequency component, is then carried out Phototube Coupling by photoisolator 2-3, and a shaping does not often reach preferable effect, thus logical
Cross Schmidt trigger 2-4 and carry out second time " squared " shaping, finally send into oscillograph 2-5 and carry out phase analysis.When two
When voltage-phase is identical, now the frequency of square-wave signal is the electrical network natural frequency of vibration, now, according toTry to achieve electrical network
Current tuning-off degree, wherein, v is electrical network tuning-off degree, f0For the electrical network natural frequency of vibration, f is standard power frequency 50HZ。
Obtaining the real-time tuning-off degree of electrical network, tuning-off degree carries out fuzzy tuning, fuzzy tuning flow chart is:
System initialization, carries out the setting of preset value.First determine whether that whether singlephase earth fault occurs, as neutral point displacement voltage U0
When meeting or exceeding the 70% of power supply phase voltage U, singlephase earth fault occurs, and system enters failsafe state, and rapid short circuit hinders
Buffer resistance, after fault terminates, again puts into damping resistance, returns to init state.When not there is earth fault, by
Tuning-off degree measurement module records electrical network real-time tuning-off degree v1, and judge whether in allowed band, if in allowed band, return
Return to init state, it is not necessary to regulation, if not in allowed band, then arc suppression coil low-pressure side magnitude of voltage, current value are carried out
Measure, then calculate arc suppression coil inductive current, electrical network three-phase transmission line capacitive earth current, ground connection residual flow.If residual flow is more
Limit, then search fuzzy controller status poll table, determine the optimal gear of arc suppression coil, realizes difference by 15 road loaded switch
Switching between gear, if residual flow does not has out-of-limit, returns to init state, whether rejudges the system failure, repeat on
State process.
The fuzzy tuning system of resonance grounding net of the present invention injects a series of constant amplitude, Automatic Frequency to arc suppression coil low-pressure side
The square-wave signal of change, and in this, as scanning signal, by a series of process to sampled signal, measure the electrical network natural frequency of vibration
f0, calculate tuning-off degree actual value v1, further according to the error of measured value Yu set-point, by searching fuzzy controller status poll
Table determines the optimal gear of arc suppression coil, and equipment needed thereby is simple, it is easy to operation, directly measures electrical network tuning-off degree, it is not necessary to its
Its parameter, measurement error is little, and precision is high, and system real time is the best.
The present invention does not addresses part and is applicable to prior art.
Claims (8)
1. the fuzzy tuning system of a resonance grounding net, it is characterised in that: include adjust sense module, tuning-off degree measurement module,
Fuzzy tuner module and actuator four part；Neutral point of electric network, through adjusting sense module ground, adjusts sense module and tuning-off degree measurement module
Being connected, tuning-off degree measurement module, to adjusting sense module to send a square-wave signal, adjusts sense module then to be sampled to take off by two voltage signals
Humorous degree measurement module, the output of tuning-off degree measurement module is connected with fuzzy tuner module, the output of fuzzy tuner module and the machine of execution
Structure is connected, and actuator is connected with adjusting sense module.
2. the fuzzy tuning system of resonance grounding net as claimed in claim 1, it is characterised in that: the measurement of electrical network tuning-off degree
Process is as follows: tuning-off degree measurement module is to adjusting sense module one square-wave signal U of transmissions, frequency is from 30HzTo 80HzAutomatically change,
With 0.1HzStep value be scanned.By the voltage U on sample resistanceRWith turn-adjusting arc-extinguishing winding step down side voltage UL
It is respectively fed to operational amplifier, carries out " squared " shaping for the first time, then respectively through active band stop filter, filter mark
Quasi-power frequency component, is then carried out Phototube Coupling by photoisolator, and a shaping does not often reach preferable effect, so passing through
Schmidt trigger carries out second time " squared " shaping, finally sends into oscillograph and carries out phase analysis.When two voltage-phases
Time identical, now the frequency of square-wave signal is the electrical network natural frequency of vibration, now, according toTry to achieve electrical network and currently take off humorous
Degree, wherein, v is electrical network tuning-off degree, f0For the electrical network natural frequency of vibration, f is standard power frequency 50Hz。
3. the fuzzy tuning system of resonance grounding net as claimed in claim 2, it is characterised in that: tuning-off degree is obscured
Tuning, fuzzy tuning flow process is:
(1) system initialization, carries out the setting of preset value, it is judged that whether singlephase earth fault occurs, as neutral point displacement voltage U0
When meeting or exceeding the 70% of power supply phase voltage U？Y → system entrance failsafe state, rapid short circuit damping resistance, therefore
After barrier terminates, again put into damping resistance, return to init state；
(2) as neutral point displacement voltage U0When meeting or exceeding the 70% of power supply phase voltage U？N → surveyed by tuning-off degree measurement module
Obtain electrical network real-time tuning-off degree v1, and judge whether in allowed band；
(3) in allowed band？Y → return to init state, it is not necessary to regulation；In allowed band？N → to arc blowout wire
Circle low-pressure side magnitude of voltage, current value measure, and then calculate arc suppression coil inductive current, electrical network three-phase transmission line direct-to-ground capacitance
Electric current, ground connection residual flow；
(4) residual flow is out-of-limit？Y → lookup fuzzy controller status poll table, determines the optimal gear of arc suppression coil, by 15 tunnels
Loaded switch realizes the switching between different gear；Residual flow is out-of-limit？N → return to init state, rejudges the system failure
Whether, repeat said process.
4. the fuzzy tuning system of resonance grounding net as claimed in claim 1, it is characterised in that: described tune feels module by adjusting
Circle formula arc suppression coil and damping resistance composition, both are series relationship, and electrical network main transformer side is star-like connection or triangle connection, when
During for star-like connection, turn-adjusting arc-extinguishing winding can be directly mounted on neutral point of electric network；When electrical network main transformer side is triangle connection,
Then draw neutral point of electric network through Z-type grounding transformer.
5. the fuzzy tuning system of resonance grounding net as claimed in claim 1, it is characterised in that: described Z-type grounding transformer
Every phase iron core on winding be divided into two parts of the upper and lower equal number of turn, be connected into indentation and connect, other structure and common three
Phase core type power transformer is identical.
6. the fuzzy tuning system of resonance grounding net as claimed in claim 1, it is characterised in that: described tuning-off degree measures mould
Block is made up of the device that oscillograph is identical with two-way, and every road device includes operational amplifier, active band stop filter, Phototube Coupling
Device and Schmidt trigger；The annexation of every road device is: operational amplifier is connected with active band stop filter, and active band hinders
Wave filter is connected with photoisolator, and the output of photoisolator is connected with Schmidt trigger；Two-way Schmidt trigger defeated
Go out and be connected with oscillograph.
7. the fuzzy tuning system of resonance grounding net as claimed in claim 1, it is characterised in that: described fuzzy tuner module
I.e. arc suppression coil fuzzy controller, this fuzzy controller is a speech path controller.
8. the fuzzy tuning system of resonance grounding net as claimed in claim 1, it is characterised in that: described actuator is by many
Road loaded switch and damping resistance short circuit control circuit composition.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510337097.XA CN106329508A (en) | 2015-06-17 | 2015-06-17 | Fuzzy tuning system of resonance grounding power grid |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2109011U (en) * | 1991-10-31 | 1992-07-01 | 上海交通大学 | Automatic tracting compensating petersen device |
| CN101071145A (en) * | 2007-06-14 | 2007-11-14 | 思源电气股份有限公司 | Method for measuring capacitance current of automatic tracking compensating device for arc-extinguishing coil |
| CN202189094U (en) * | 2011-07-25 | 2012-04-11 | 河北工业大学 | Device for automatically measuring off-turning degree of resonance earthing power grid |
| CN202190075U (en) * | 2011-08-18 | 2012-04-11 | 河北工业大学 | Fuzzy tuning system of turn-adjusting arc-extinguishing coil |
-
2015
- 2015-06-17 CN CN201510337097.XA patent/CN106329508A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2109011U (en) * | 1991-10-31 | 1992-07-01 | 上海交通大学 | Automatic tracting compensating petersen device |
| CN101071145A (en) * | 2007-06-14 | 2007-11-14 | 思源电气股份有限公司 | Method for measuring capacitance current of automatic tracking compensating device for arc-extinguishing coil |
| CN202189094U (en) * | 2011-07-25 | 2012-04-11 | 河北工业大学 | Device for automatically measuring off-turning degree of resonance earthing power grid |
| CN202190075U (en) * | 2011-08-18 | 2012-04-11 | 河北工业大学 | Fuzzy tuning system of turn-adjusting arc-extinguishing coil |
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