CN107947115A - Monitoring is with suppressing transformer DC magnetic bias system in a kind of AT tractive power supply systems - Google Patents
Monitoring is with suppressing transformer DC magnetic bias system in a kind of AT tractive power supply systems Download PDFInfo
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- CN107947115A CN107947115A CN201711333929.6A CN201711333929A CN107947115A CN 107947115 A CN107947115 A CN 107947115A CN 201711333929 A CN201711333929 A CN 201711333929A CN 107947115 A CN107947115 A CN 107947115A
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- magnetic biasing
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- magnetic
- power supply
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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
- H02H7/04—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 for transformers
- H02H7/055—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 for transformers for tapped transformers or tap-changing means thereof
Abstract
The present invention provides a kind of AT power supply tractive transformers D.C. magnetic biasing detection and suppression system, and the system comprises detection terminal, control system and DC magnetic biasing suppression device；The detection terminal is connected by control system with the DC magnetic biasing suppression device.The detection terminal is connected in parallel on Traction networks feeder line, has the characteristics that separated by direct communication, and the DC magnetic biasing suppression device is connected by transformer tapping with tractive transformer.The control system includes detection and restrainable algorithms platform, contained DC component can be calculated by the AC current values that the detection terminal collects, and it is equal in magnitude with it to control DC magnetic biasing suppression device to produce, the opposite DC current in direction, injected at transformer tapping, to reach the effect for suppressing D.C. magnetic biasing.Technical solution provided by the invention is simple and reliable, can eliminate influence of the D.C. magnetic biasing to AT traction power supply transformer safety stable operations.
Description
Technical field
The present invention relates to a kind of D.C. magnetic biasing suppression system, is specially a kind of tractive transformer D.C. magnetic biasing suppression system.
Background technology
With power grid " transferring electricity from the west to the east, north and south supply mutually, national network " implementation, it is adapted to high-power, long distance power transmission
Super high voltage direct current electricity transmission technology be more and more widely used.Long distance powedr transmission is carried out using HVDC Transmission Technology, can
To improve the economy of Operation of Electric Systems, stability and the flexibility of scheduling, there is vast potential for future development.
But find in actual operation, when DC transmission system is with the monopole ground return circuit method of operation, easily lead to it
There is DC magnetic bias phenomena in the transformer of surrounding AC Substation, and converter power transformer can also produce DC magnetic bias phenomena.Cause to become
Depressor DC magnetic bias phenomena also has geomagnetic induction current, and solar flare outburst can produce ground magnetic strength in long distance transmission line
Induced current work, its peak value is reachable, frequency between one, compared with the power frequency of AC system can approximation regard DC current as.
Above-mentioned two situations trigger the process of D.C. magnetic biasing essentially identical.All it is that DC current produces between two grounding transformers
Raw potential difference, DC current, which flows through transformer, makes iron core saturation, causes exciting current to distort, and produces a large amount of harmonic waves, make iron core without
Work(loss increase, it is also possible to cause the voltage of system seriously to reduce, cause the relay misoperation of system to be made.D.C. magnetic biasing except
Outside electric system is had an impact, also have a significant impact in itself to transformer, serious magnetic saturation can make under normal circumstances in iron
The flux portion closed in the heart leaves iron core, makes the loss increase of transformer hardware, causes hot-spot phenomenon, destroys exhausted
Edge, damages transformer or reduces the service life.
At present, mainly there is kind 1. in transformer on suppressing the method for inflow transformer neutral point direct current both at home and abroad
Property point installing resistance, limit the size of DC current；2. reverse current penalty method, is offset or is cut using reverse DC current
The adverse effect of weak DC current；3. installing capacitance in transformer neutral point, DC current is blocked.
The above method mainly concentrates on and attachment device is installed on transformer neutral point, becomes so as to reach weakening or block
The purpose of depressor neutral point direct current, is not carried out excessively to changing this body structure of transformer with reducing D.C. magnetic biasing effect
Research.
The content of the invention
In view of the above-mentioned problems, deficiency technical at this stage is not solved, it is an object of the invention to provide one kind
AT power supply tractive transformer D.C. magnetic biasing suppression systems, can effectively solve the problems, such as tractive transformer D.C. magnetic biasing, improve
Security and stability, and the system suppresses D.C. magnetic biasing from tractive transformer itself by this body structure of tractive transformer,
Technical solution is simple and reliable.
Technical solution provided by the invention is：A kind of AT power supply tractive transformers D.C. magnetic biasing detection and suppression system, institute
Stating system includes detection terminal, control system and DC magnetic biasing suppression device；The detection terminal by control system with it is described
DC magnetic biasing suppression device is connected.The detection terminal is connected in parallel on Traction networks feeder line, has the characteristics that separated by direct communication, described straight
Stream magnetic bias restraining device is connected by transformer tapping with tractive transformer.The control system includes detection and is put down with restrainable algorithms
Platform, can calculate contained DC component by the AC current values that the detection terminal collects, and control D.C. magnetic biasing to press down
Device processed produces, direction opposite DC current equal in magnitude with it, is injected at transformer tapping, inclined to reach suppression direct current
The effect of magnetic.
Preferably, the detection terminal is made of 101 current transformers and 102 sensors；Wherein, 101 Current Mutual Inductance
Device is connected in parallel on Traction networks feeder line, monitors feeder current in real time, has the characteristics that separated by direct communication, can not directly to DC component into
Row measurement；The data that 102 sensors collect mutual inductor are transferred to control system.
Preferably, the DC magnetic biasing suppression device includes：1) D.C. magnetic biasing coil；2) automatic tuning reactor；3)
Power supply compensating module.The D.C. magnetic biasing coil and automatic tuning reactor by iron core, be bound up on respectively primary side winding and
On vice-side winding.
Further, the D.C. magnetic biasing coil both ends are connected at tractive transformer -5% and+5% tap.
Further, the automatic tuning reactor is connected with power supply compensating module, and makes D.C. magnetic biasing line by iron core
Required DC current is induced in circle and is injected into Secondary Side of Traction Transformer.
Further, the power supply compensating module is produced required by the control signal received from control system
Electric current is compensated, and is injected into automatic tuning reactor.
Preferably, 103 control systems include detection algorithm platform and restrainable algorithms platform, the detection algorithm
Platform is drawn contained straight in Traction networks feeder line by carrying out analysis calculating to the AC current waveform received at sensor
Flow point value；The restrainable algorithms platform produces control signal according to detected direct current component value, and control signal is sent out
DC magnetic biasing suppression device is given, makes its generation can be with the electric current of contained DC component cancellation in Traction networks feeder line.
Preferably, the detection algorithm is to be fitted first by using Langevin function pair J-A theoretical models
To M-H curves, then bring the functional relation of magnetic induction density B and magnetic field intensity H into, obtain unslugged during D.C. magnetic biasing
BH curve Model B=f (H), the operating point after making f " (H)=0 can to deviate；To the current wave measured by DC detecting device
Shape is integrated, and makes S1=S2, obtains H0 values；Gained H0 values are brought into f " (H)=0 contained by can solving in Traction networks feeder line
Direct current component value, and opposite DC current control value is provided, to have the function that cancellation.
Brief description of the drawings
Fig. 1 is transformer DC magnetic bias provided by the invention detection and suppression system structure diagram；
Fig. 2 is DC magnetic biasing suppression device structure chart；
Fig. 3 is DC magnetic bias current oscillogram；
Fig. 4 is non DC bias and has D.C. magnetic biasing hysteresis ring comparison diagram；
Fig. 5 is excitation surge current oscillogram；
Embodiment
For a better understanding of the present invention, present invention is described further with reference to Figure of description.
Tractive transformer D.C. magnetic biasing detection provided by the invention is as shown in Figure 1 with the structure of suppression system：The system
100 include：101 current transformers, 102 sensors, 103 control systems and 104 DC magnetic biasing suppression devices.Wherein, 101 electricity
The detection terminal part of current transformer and 102 sensors composition system.
The transformer includes the closed rectangular frame gripped connection by the vertical iron core in both sides and upper and lower two horizontal iron and formed
The iron core of shape and the first winding being respectively wound around in the vertical iron core column in both sides and secondary winding composition, the transformer are
AT tractive transformers, first winding, the secondary winding of the transformer are coupled by V/X modes.
The detection terminal is connected in parallel on Traction networks feeder line, and institute in Traction networks feeder line is detected by 101 current transformers
Measured AC current waveform, is transferred in 103 control systems by the AC compounent contained by 102 mutual inductors.
The control system 103, to carrying out processing calculating from AC current values obtained by detection terminal, is obtained as detection algorithm
Go out DC component contained in Traction networks feeder line；Processing calculating is carried out to measured direct current component value by restrainable algorithms, is obtained
To required control signal, and transmit control signals in DC magnetic biasing suppression device.
DC magnetic biasing suppression device structure chart is as shown in Figure 2：The 104 D.C. magnetic biasing suppression system includes 1 D.C. magnetic biasing
Coil, 2 automatic tuning reactors and 3 power supply compensating modules.The 3 power supply compensating module is connected with 2 automatic tuning reactors,
Current compensation is carried out to automatic tuning reactor by receiving from the control signal that 103 control systems produce, and in 1 D.C. magnetic biasing
Required DC current is induced in coil, is injected from tractive transformer tap+%5 and-%5, contained by Traction networks feeder line
Direct-current component is offset, to suppress tractive transformer DC magnetic bias phenomena.
DC component detection algorithm under a kind of tractive transformer D.C. magnetic biasing proposed by the present invention is modeled, following institute
Show：
Each numerical chracter is defined first as follows：
Table 1
J-A theoretical models are by Langevin Function Fittings, available anhysteretic curve model：
Line current is represented by：
I (t)=Idc+Iacsin(ωt) (2)
The size of the intensity of magnetization is represented by：
Mt=Mdc+Mac (3)
It can be obtained by circuital law：
Ht(t)=Ni (t)/l=N (Idc+IacSin ω t)/l=Hdc(t)+Hac(t) (4)
Effective magnetic field intensity is：
Het=H+ α M=Hdc+Hac+α(Mac+Mdc)=Ht+αMt (5)
Bringing formula (5) into formula (1) can obtain, anhysteretic curve model during D.C. magnetic biasing：
Magnetic induction intensity and the relational model of magnetic field intensity are as follows：
B=μ0(H+M) (7)
Formula (7) is brought into (6), when can obtain D.C. magnetic biasing without magnetic hysteresis BH curve model：
B=f (H) (8)
B "=f " (H) can be obtained by carrying out secondary derivation to formula (8), and the point for trying to achieve f " (H)=0 is without magnetic hysteresis BH curve
Operating point.
It can be obtained according to Fig. 4, alternating current is in non-standard sinusoidal waveform under excitation surge current state, but still conforms to area S1=S2
Principle, carry out integration to area above and below waveform and obtain to meet S1=S2H0Point.
The H that will be obtained0Point, which is brought into formula f " (H)=0, can solve HdcValue, pass through formulaI can be tried to achieve againdc
Value, be required DC component value.
Claims (8)
1. a kind of AT power supply tractive transformers D.C. magnetic biasing detection and suppression system, the system comprises detection terminal, control system
System and DC magnetic biasing suppression device；The detection terminal is connected by control system with the DC magnetic biasing suppression device；It is described
Detection terminal is connected in parallel on Traction networks feeder line, has the characteristics that separated by direct communication, and the DC magnetic biasing suppression device passes through transformer
Tap is connected with tractive transformer；The control system includes detection and restrainable algorithms platform, can pass through the detection terminal
The AC current values collected calculate contained DC component, and it is equal in magnitude with it to control DC magnetic biasing suppression device to produce,
The opposite DC current in direction, injects at transformer tapping, to reach the effect for suppressing D.C. magnetic biasing.
A kind of 2. AT power supplies tractive transformer D.C. magnetic biasing suppression system according to claim 1, it is characterised in that：
The detection terminal is made of 101 current transformers and 102 sensors；Wherein, 101 current transformers are connected in parallel on traction
On net feeder line, feeder current is monitored in real time, there is separated by direct communication, and directly DC component can not be measured；102 pass
The data that sensor collects mutual inductor are transferred to control system.
A kind of 3. AT power supplies tractive transformer D.C. magnetic biasing suppression system according to claim 1, it is characterised in that：
104 DC magnetic biasing suppression devices include：1) D.C. magnetic biasing coil；2) automatic tuning reactor；3) power supply compensates
Module；The D.C. magnetic biasing coil and automatic tuning reactor are bound up on primary side winding and vice-side winding respectively by iron core
On.
A kind of 4. AT power supplies tractive transformer D.C. magnetic biasing suppression system according to claim 3, it is characterised in that：
The D.C. magnetic biasing coil both ends are connected at tractive transformer -5% and+5% tap.
A kind of 5. AT power supplies tractive transformer D.C. magnetic biasing suppression system according to claim 3, it is characterised in that：
The automatic tuning reactor is connected with power supply compensating module, and makes by iron core to induce institute in D.C. magnetic biasing coil
The DC current of need is simultaneously injected into Secondary Side of Traction Transformer.
A kind of 6. AT power supplies tractive transformer D.C. magnetic biasing suppression system according to claim 3, it is characterised in that：
The power supply compensating module produces required compensation electric current by the control signal received from control system, and
It is injected into automatic tuning reactor.
A kind of 7. AT power supplies tractive transformer D.C. magnetic biasing suppression system according to claim 1, it is characterised in that：
103 control systems include detection algorithm platform and restrainable algorithms platform, and it is right that the detection algorithm platform passes through
The AC current waveform received at sensor carries out analysis calculating, draws direct current component value contained in Traction networks feeder line；
The restrainable algorithms platform produces control signal according to detected direct current component value, and it is inclined to send control signals to direct current
Magnetic restraining device, makes its generation can be with the electric current of contained DC component cancellation in Traction networks feeder line.
A kind of 8. AT power supplies tractive transformer D.C. magnetic biasing suppression system according to claim 1, it is characterised in that：
The detection algorithm is to be fitted to obtain M-H curves by using Langevin function pair J-A theoretical models first,
Then the functional relation of magnetic induction density B and magnetic field intensity H are brought into, obtains unslugged BH curve Model B during D.C. magnetic biasing
=f (H), the operating point after making f " (H)=0 can to deviate；Current waveform measured by DC detecting device is integrated, is made
S1=S2, obtains H0 values；Gained H0 values, which are brought into f " (H)=0, can solve direct current component value contained in Traction networks feeder line, and
Opposite DC current control value is provided, to have the function that cancellation.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711333929.6A CN107947115A (en) | 2017-12-14 | 2017-12-14 | Monitoring is with suppressing transformer DC magnetic bias system in a kind of AT tractive power supply systems |
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| CN201711333929.6A CN107947115A (en) | 2017-12-14 | 2017-12-14 | Monitoring is with suppressing transformer DC magnetic bias system in a kind of AT tractive power supply systems |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110239359A (en) * | 2019-07-15 | 2019-09-17 | 中国矿业大学 | The elimination circuit and method of dual current system electric locomotive tractive transformer D.C. magnetic biasing when power supply system switches |
| CN110399677A (en) * | 2019-07-25 | 2019-11-01 | 国网山西省电力公司电力科学研究院 | Based on the transformer DC magnetic bias simulation method for improving J-A formula under bias state |
| CN113067512A (en) * | 2021-03-17 | 2021-07-02 | 中铁第四勘察设计院集团有限公司 | Railway electrification magnetic bias suppression system and method |
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| CN202444249U (en) * | 2012-02-10 | 2012-09-19 | 宁夏电力公司电力科学研究院 | Neutral point DC magnetic biasing inhibiting device of transformer |
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| CN202444249U (en) * | 2012-02-10 | 2012-09-19 | 宁夏电力公司电力科学研究院 | Neutral point DC magnetic biasing inhibiting device of transformer |
| CN203800581U (en) * | 2013-12-26 | 2014-08-27 | 国网电力科学研究院武汉南瑞有限责任公司 | Transformer DC bias magnet restrain device with reverse current injection |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110239359A (en) * | 2019-07-15 | 2019-09-17 | 中国矿业大学 | The elimination circuit and method of dual current system electric locomotive tractive transformer D.C. magnetic biasing when power supply system switches |
| CN110399677A (en) * | 2019-07-25 | 2019-11-01 | 国网山西省电力公司电力科学研究院 | Based on the transformer DC magnetic bias simulation method for improving J-A formula under bias state |
| CN110399677B (en) * | 2019-07-25 | 2022-10-28 | 国网山西省电力公司电力科学研究院 | Transformer direct-current magnetic bias simulation method based on J-A formula improved under magnetic bias state |
| CN113067512A (en) * | 2021-03-17 | 2021-07-02 | 中铁第四勘察设计院集团有限公司 | Railway electrification magnetic bias suppression system and method |
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