CN105914710B - Transformer excitation flow suppression system and method based on switching voltage FREQUENCY CONTROL - Google Patents
Transformer excitation flow suppression system and method based on switching voltage FREQUENCY CONTROL Download PDFInfo
- Publication number
- CN105914710B CN105914710B CN201610257822.7A CN201610257822A CN105914710B CN 105914710 B CN105914710 B CN 105914710B CN 201610257822 A CN201610257822 A CN 201610257822A CN 105914710 B CN105914710 B CN 105914710B
- Authority
- CN
- China
- Prior art keywords
- control
- transformer
- voltage frequency
- switching voltage
- mrow
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000005284 excitation Effects 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 38
- 230000001629 suppression Effects 0.000 title claims abstract description 9
- 230000004907 flux Effects 0.000 claims abstract description 56
- 230000005389 magnetism Effects 0.000 claims abstract description 26
- 230000008569 process Effects 0.000 claims description 16
- 230000008859 change Effects 0.000 claims description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 230000001052 transient effect Effects 0.000 claims description 6
- 238000004804 winding Methods 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 3
- 230000002349 favourable effect Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims 1
- 230000004224 protection Effects 0.000 abstract description 8
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000002411 adverse Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000035772 mutation Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Ac-Ac Conversion (AREA)
Abstract
The invention discloses a kind of transformer excitation flow suppression system and method based on switching voltage FREQUENCY CONTROL, including remanent magnetism to detect, parameter setting；Control function is generated, calculates control function parameter；System power supply is connected with transformer primary side by switching voltage frequency control system, changes the electric voltage frequency of input transformer according to control function, finishing control disconnects switching voltage frequency control system and power supply and transformer primary side directly close a floodgate.Beneficial effects of the present invention：The size of magnetic flux during transformer during no-load closing can accurately be controlled, so as not to the saturation flux that can bear more than transformer core, so as to reach the purpose of excitation surge current；The generation of excitation surge current can fundamentally be suppressed, can more effectively avoid excitation surge current to transformer in itself, the influence of the equipment such as tranformer protection；Allow to carry out select and set to control function, it can be ensured that the flexibility of control program and the adaptability to different type transformer.
Description
Technical field
The invention belongs to power system transformer protection technique, more particularly to a kind of change based on switching voltage FREQUENCY CONTROL
Depressor excitation surge current suppression system and method.
Background technology
Power transformer is the visual plant of power system, when transformer during no-load closing, external area error excision or mains side
During overvoltage, due to the awareness character of transformer, larger excitation surge current can be produced, transformer rated current is can reach when serious
Six to octuple.Larger excitation surge current can increase the caloric value of transformer core, influence the service life of transformer；It can produce
Raw a large amount of harmonic waves, influence the quality of power supply；It can also cause protective relaying device to malfunction, influence the safe and reliable operation of power network.Its
Excitation surge current caused by middle transformer during no-load closing is generally larger, the influence brought to transformer itself and protection device also compared with
To be obvious.
The method that reply excitation surge current influences at present includes：
(1) feature of normal current and fault current is different to identify excitation surge current according to excitation surge current, then avoided
The influence of excitation surge current；Such method is influenceed by recognition principle and information processing method, and recognition correct rate needs further to be carried
It is high.In addition exciting current can only be identified for this kind of method, the size of uncontrollable excitation surge current.
(2) generation of excitation surge current is suppressed by external equipment or the methods of changing inside transformer structure.Such method
Need to change system architecture, and be only capable of suppressing excitation surge current to a certain extent.
The content of the invention
The invention aims to suppress to produce the larger excitation surge current of amplitude during transformer during no-load closing, there is provided
A kind of transformer excitation flow suppression system and method based on switching voltage FREQUENCY CONTROL, by transformer and a side-line
An indirect switching voltage frequency control system for system power supply, can control the frequency size of input voltage, transformer core is existed
During idle-loaded switching-on will not saturation, control transformer control making process in caused excitation surge current；Reduce so as to reach
The purpose that excitation surge current adversely affects in itself, to equipment such as tranformer protections to transformer.
To achieve the above object, the present invention uses following technical proposals：
A kind of transformer excitation flow suppression system based on switching voltage FREQUENCY CONTROL, including switching voltage FREQUENCY CONTROL
System, the switching voltage frequency control system are connected by switching with power-supply system and transformer respectively, the power-supply system
Directly it is connected by switch with transformer；
The switching voltage frequency control system includes：
Remanent magnetism estimation block：For monitoring the remanent magnetism situation before Transformer Close in iron core, and Date of residual magnetism is transmitted
To switching voltage frequency function control module；
Control parameter setup module：For by be manually set control the time started, the end time, finishing control condition
Parameter becomes the recognizable signal of switching voltage frequency function control module, and the signal is sent into switching voltage frequency letter
Number control module；
Switching voltage frequency function control module：For the signal of input to be generated into voltage frequency according to predetermined control principle
Rate control function, calculate each parameter of control function；Control signal is respectively outputted to the electricity that closes a floodgate according to the parameter of control function
In voltage-frequency rate output module and Switch Control module；
Switching voltage rate-adaptive pacemaker module：According to the control parameter of the switching voltage frequency function control module received,
Output voltage frequency is changed and exports the voltage after changing；
Switch Control module：The control parameter of the switching voltage frequency function control module received for basis,
Control the idle-loaded switching-on of transformer.
Further, at the time of beginning is controlled, system power supply is switched to sky by switching voltage frequency control system
The primary side of transformer is carried, FREQUENCY CONTROL is carried out to supply voltage, output changes the supply voltage after frequency；Reach finishing control
After condition, cut off the connection between switching voltage frequency control system and transformer, system power supply, and by system power supply directly with
Transformer primary side is directly connected to, and terminates whole switching voltage frequency control process.
A kind of transformer excitation flow suppressing method based on switching voltage FREQUENCY CONTROL, including：
(1) transformer remanent magnetism size and direction before detection is closed a floodgate, control time started, end time, control is set to terminate
Conditional parameter；
(2) change control function according to predetermined control principle generation electric voltage frequency, calculate each parameter of control function；
(3) frequency of system power source voltage is changed according to control function；Control source after change frequency is arrived
The primary side of transformer；
(4) after reaching control termination condition, electric voltage frequency control terminates, and the input voltage of transformer primary side is changed into system
Supply voltage.
Further, in the step (1), transformer flux frequency when control termination condition refers to finishing control is equal to work
Frequently.
Further, in the step (2), control principle is：Appoint transformer core by control input electric voltage frequency
The magnetic flux at meaning moment is no more than transformer saturation flux.
Further, in the step (2), the control function of generation is：
f(t)=fm(2-eat)；
Wherein, a ＞ 0, fm>=50, a, fmAmount respectively to be set.
Further, the f in control functionmDetermine the initial value of frequency：fmBigger, initial frequency is bigger, magnetic flux amplitude initial value
It is smaller.
Further, fmObtained when switching angle closes a floodgate with remanent magnetism least favorable situation, i.e., transformer transient magnetic flux is equal to full
Obtained with the limiting case of magnetic flux,
Wherein, UmFor system power supply amplitude, N1For the transformer first side winding number of turn, R1For transformer first side winding electricity
Resistance, is transformer magnetizing inductance, φ0For transformer remanent magnetism, φsat=1.26 φN, φNFor rated flux.
Further, a in control function determines the rate of change of electric voltage frequency：The decay of the bigger frequencies of a is faster；A value
It is at the end of control process passes through the Δ t times, makes frequency function be obtained equal to power frequency,
Wherein, Δ t is the duration of electric voltage frequency control process.
The beneficial effects of the invention are as follows：
The larger excitation surge current of caused amplitude during transformer during no-load closing, it is unfavorable not only to be brought in itself to transformer
Influence, can also influence the normal work of tranformer protection, cause idle-loaded switching-on to fail.The present invention from analysis transformer during no-load closing
The mechanism of production of excitation surge current is set out, and analysis produces the various influence factors of excitation surge current, it is determined that suppressing the technology of excitation surge current
Measure.Under the premise of the feasibility of various technical measures implementations is considered, this parameter of selection control switching voltage frequency, so as to reach
To the purpose of control transformer during no-load closing excitation surge current.
Technical measures proposed by the present invention, the size of magnetic flux during transformer during no-load closing can accurately be controlled
System, so as not to the saturation flux that can bear more than transformer core, so as to reach the purpose of excitation surge current.With at present extensively
The excitation flow recognition method of use is compared, and the present invention can fundamentally suppress the generation of excitation surge current, can just keep away naturally
Exempt from excitation surge current to transformer in itself, the influence of the equipment such as tranformer protection, and excitation flow recognition method can not reduce excitation
Shove, although its adverse effect to tranformer protection can be avoided to a certain extent, can not avoid its to transformer in itself
Influence.Further it is proposed that transformer during no-load closing electric voltage frequency control program allow to select control parameter
And setting, it can be ensured that the flexibility of control program and the adaptability to different type transformer.
Brief description of the drawings
Fig. 1 is the electric voltage frequency control system schematic diagram that the present invention designs；
Fig. 2 is electric voltage frequency controlling curve；
Fig. 3 (a) be emulate one three-phase transformer A phases to B phases alternate flux plot；
Fig. 3 (b) be emulate one three-phase transformer B phases to C phases alternate flux plot；
Fig. 3 (c) be emulate one three-phase transformer C phases to A phases alternate flux plot；
Fig. 4 (a) be emulate two three-phase transformer A phases to B phases alternate flux plot；
Fig. 4 (b) be emulate two three-phase transformer B phases to C phases alternate flux plot；
Fig. 4 (c) be emulate two three-phase transformer C phases to A phases alternate flux plot；
Fig. 5 is one difference current virtual value of emulation；
Fig. 6 is two difference current virtual values of emulation.
Embodiment：
The present invention will be further described with example below in conjunction with the accompanying drawings：
A kind of transformer excitation flow suppression system based on switching voltage FREQUENCY CONTROL, as shown in figure 1, including：Close a floodgate
Electric voltage frequency control system, switching voltage frequency control system are connected by switching with power-supply system and transformer respectively, power supply
System is directly connected by switch with transformer；
Switching voltage frequency control system includes：
Remanent magnetism estimation block：For monitoring the remanent magnetism situation before Transformer Close in iron core, including the size of remanent magnetism and
Direction；And Date of residual magnetism is sent to switching voltage frequency function control module；
Control parameter setup module：For by be manually set control the time started, the end time, finishing control condition
Become the recognizable signal of switching voltage frequency function control module etc. parameter, and the signal is sent to switching voltage frequency
Function control module；
Wherein, during magnetic flux amplitude and normal operation when the condition of finishing control refers to finishing control process between magnetic flux amplitude
Difference be less than setting difference.
Switching voltage frequency function control module：For the signal of input to be controlled into letter according to predetermined control principle generation
Number, calculate each parameter of control function；It is defeated that control signal is respectively outputted to switching voltage frequency according to the parameter of control function
Go out in module and Switch Control module；
Switching voltage rate-adaptive pacemaker module：According to the control parameter of the switching voltage frequency function control module received,
Output voltage frequency is changed and exports the voltage after changing；
Switch Control module：The control parameter of the switching voltage frequency function control module received for basis,
Control the idle-loaded switching-on of transformer.
What switching voltage rate-adaptive pacemaker module inputted with Switch Control module according to switching voltage frequency control module
Control signal, at the time of beginning is controlled, system power supply is switched to no-load transformer by switching voltage frequency control system
Primary side, start switching voltage frequency control process, after reaching finishing control condition, cut off switching voltage frequency control system
Connection between transformer, system power supply, and system power supply is directly once directly connected to transformer, terminate whole close a floodgate
Electric voltage frequency control process.
A kind of transformer excitation flow suppressing method based on switching voltage FREQUENCY CONTROL, including：
(1) transformer remanent magnetism size and direction before detection is closed a floodgate, the parameters such as control time started, end time are set；
(2) according to remanent magnetism and the parameter set, specific control function is generated according to control principle, calculates control function
Each parameter；
(3) switching voltage frequency control system is linked between system power supply and transformer primary side, total system enters
Enter switching voltage frequency control process, the electric voltage frequency of system power supply is changed according to control function, end voltage frequency
It will cut off the connection of switching voltage frequency control system and power supply and transformer after control, while by system power supply and transformer one
Directly close a floodgate secondary side.
Using a kind of electric voltage frequency change control letter of monotone decreasing reciprocal each other with transient state flux component changing rule
Number f(t).The characteristics of voltage control functions curve is curve smoothing, will not cause the mutation of magnetic flux, electric voltage frequency curvilinear function
Slope and transient state flux component slope of a curve it is reciprocal each other, end value is equal to power frequency.Therefore it can obtain the letter of control function
Numerical expression f(t)=fm(2-eat), wherein a ＞ 0, fm>=50 be amount to be set.
Excitation surge current imWith transformer flux φmRelation be im≈N1φm/Lμ, wherein N1In for transformer primary side around
The group number of turn, LμFor transformer magnetizing inductance.Transformer flux is less than saturation flux, and it is normal that excitation surge current would not influence transformer
Operation.Therefore control principle needs to meet that transformer core magnetic flux is no more than transformer in whole switching voltage frequency control process
Saturation flux, the herein φ of saturation flux 1.1satFor 1.26 φN, φNFor transformer rated flux.That is any time magnetic flux φmNeed
Meet following formula：
Wherein φ0For remanent magnetism, α is switching angle, R1For first side winding resistance, UmFor system power supply amplitude,
Make the π f of ω in formula (1)=2(t)The magnetic flux of transformer core can be changed by controlling curve function, controlled
F in the function of curvemDetermine the initial value of frequency.fmBigger, initial frequency is bigger, and magnetic flux amplitude initial value is smaller.fmIn switching angle
Obtained when being closed a floodgate with remanent magnetism least favorable situation, i.e., transformer transient magnetic flux is equal under the limiting case of saturation flux and obtained, it is assumed that
Sin (α)=- 1, φ in formula (1)0Just, for convenience of calculating the sin (ω t+ α)=1 in steady-state component, at the t=0 moment, to make
Magnetic flux is equal to the φ of saturation flux 1.1 in transformersat, obtain formula (2).Formula (2) is fmValue.
A in control function determines the rate of change of frequency.The decay of the bigger frequencies of a is faster.A value is passed through in control process
At the end of spending the Δ t times, frequency function is made to be obtained equal to power frequency, i.e. fm(2-eaΔt)=50.As a result as shown in formula (3).
Above-mentioned parameter is all suitable for single-phase with three-phase transformer.
Any control function is selected to be required for meeting formula (1), but different control principles will influence to join in control function
Several values.
In Fig. 1, when to carry out idle-loaded switching-on to transformer, switching voltage frequency control system is closed at first with being
System power supply, two switches of transformer side, the voltage for being so added in transformer primary side is switching voltage frequency control system
Output voltage, the frequency change of output voltage are the form changes of the control function of step (3) setting, and operation herein is able to ensure that
Magnetic flux will not produce larger excitation surge current not over saturation flux.The switching voltage after default control time
The output voltage frequency of frequency control system is equal to power frequency, now first directly connects transformer primary side and system power supply, so
First disconnect the switch of switching voltage frequency control system and transformer primary side afterwards, then disconnect switching voltage frequency control system with
The switch of system power supply, switch to system power supply to power in transformer, complete the idle-loaded switching-on of transformer.
After the output voltage frequency of switching voltage frequency control system is equal to power frequency, switching voltage frequency control system can
With out of service, change by system power supply directly to transformer-supplied, the change of frequency is not present during this, and due to the present invention
Do not change voltage magnitude and phase angle, therefore the mutation of amplitude and phase angle is also not present when two current supply circuits switch.Therefore it is complete
It can ignore entirely and be impacted caused by the transient process of switching.
Three-phase two-simulation transformer model is built as shown in figure 1, three-phase transformer rated capacity is 400MVA, rated voltage
For 220kV.System power supply is power frequency 220kV alternating currents, to direct idle-loaded switching-on and using switching voltage control program combined floodgate two
Kind situation is emulated.
Emulation one：It is respectively φ to set three-phase remanent magnetism0A=0.97 φmax、φ0B=-0.70 φmax、φ0C=-0.26
φmax.Switching voltage FREQUENCY CONTROL scheme is not used when A phases switching angle is 0 °, direct three-phase no-load closes a floodgate.
Emulation two：In the case of the primary condition and switching angle all identicals of emulation one, using switching voltage FREQUENCY CONTROL
Measure.With 1.1 φsatFor flux reference value, the φ of this emulation transformermaxFor 0.88, the remanent magnetism of A phases is maximum in three-phase remanent magnetism,
The remanent magnetism of A phases is then selected as the remanent magnetism in calculation formula, i.e. φ0=0.97 φmax.F is calculated to obtain according to formula (2)m=
67.07.It is 2 seconds, i.e. Δ t=2s that this emulation, which sets the switching voltage frequency control process time, and a is can be calculated according to formula (3)
=0.113.Electric voltage frequency controlling curve function schematic diagram is as shown in Figure 2.
The magnetic flux between two-phase can be obtained in three-phase transformer model, such as Fig. 3 (a)-Fig. 3 (c) and Fig. 4 (a)-Fig. 4
(c) shown in, ordinate is with 1.1 φsatOn the basis of perunit value.But in three-phase transformer model can not direct measurement obtain
Excitation surge current, therefore reflect with the difference current under no-load condition the size of excitation surge current indirectly, it is worth on the basis of rated current,
As shown in Figure 5, Figure 6.
From Fig. 3 (a)-Fig. 3 (c), because each phase remanent magnetism that emulation is set is different, therefore two alternate iron core magnetic fluxs become
Law is also different.The alternate magnetic fluxs alternate with BC of wherein AB include forward dc component, and its maximum produces after combined floodgate divides
Wei 1.8 and 1.2.Magnetic flux alternate CA includes negative sense DC component, and minimum value is produced as -1.8 after combined floodgate.After about 3s
Three-phase flux waveformses are smoothly changed into amplitude as 0.88 on 0 symmetrical sine wave.
After switching voltage FREQUENCY CONTROL scheme, emulating two alternate iron core magnetic flux, to be most worth situation obvious compared to Fig. 3
Reduce, as shown in Fig. 4 (a)-Fig. 4 (c).Using after switching voltage FREQUENCY CONTROL scheme since 1 second, the iron core magnetic flux of three-phase is exhausted
It is not above perunit value 1 to value maximum, 0.88 when magnetic flux amplitude is gradually increased to finishing control by 0.6.Tied at 3 seconds
Flux waveformses during beam control program have approached normal operating condition.
To emulation one with emulation two difference current perunit value carry out Fourier transformation obtain its virtual value respectively as Fig. 5 with
Shown in Fig. 6, emulate one A, B, C phase difference current virtual value and reached maximum in moment of closing a floodgate, respectively 2.07,0.096,
2.09 decayed to 0.032 after 0.8 second.Emulation two is after control program is come into effect, A, B, C phase difference current difference
The reason for vibration changes to 0.040,0.039,0.041 at the end of controlling since 0.024,0.022,0.027, and vibration changes
It is due to that frequency is constantly changing.Occur a small size saltus step after finishing control scheme, be stabilized to after 1.2 seconds
0.032.For the difference current virtual value of emulation two in whole process, its maximum reduces 50 relative to the maximum of emulation one
It is more again, and its maximum is much smaller than perunit value, therefore influence of the excitation surge current to difference current can be ignored.
The switching voltage FREQUENCY CONTROL scheme of emulation two can effectively control transformer core magnetic flux to be no more than as fully visible
Saturation value, so as to effectively reduce the influence that excitation surge current is run to three-phase transformer, therefore the electric voltage frequency of the present invention
Control strategy can reach the purpose for suppressing excitation surge current.
Although above-mentioned the embodiment of the present invention is described with reference to accompanying drawing, model not is protected to the present invention
The limitation enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need to pay various modifications or deformation that creative work can make still within protection scope of the present invention.
Claims (9)
1. a kind of transformer excitation flow suppression system based on switching voltage FREQUENCY CONTROL, it is characterized in that, including switching voltage
Frequency control system, the switching voltage frequency control system is connected by switching with power-supply system and transformer respectively, described
Power-supply system is directly connected by switch with transformer；
The switching voltage frequency control system includes：
Remanent magnetism estimation block：For monitoring the remanent magnetism situation before Transformer Close in iron core, and Date of residual magnetism is sent to conjunction
Lock electric voltage frequency function control module；
Control parameter setup module：For by be manually set control the time started, the end time, finishing control conditional parameter
Become the recognizable signal of switching voltage frequency function control module, and the signal is sent to switching voltage frequency function control
Molding block；
Switching voltage frequency function control module：For the signal of input to be generated into electric voltage frequency control according to predetermined control principle
Function processed, calculate each parameter of control function；Control signal is respectively outputted to switching voltage frequency according to the parameter of control function
In rate output module and Switch Control module；
Switching voltage rate-adaptive pacemaker module：According to the control parameter of the switching voltage frequency function control module received, to defeated
Go out electric voltage frequency to be changed and export the voltage after changing；
Switch Control module：For the control parameter according to the switching voltage frequency function control module received, control
The idle-loaded switching-on of transformer.
2. a kind of transformer excitation flow suppression system based on switching voltage FREQUENCY CONTROL as claimed in claim 1, it is special
Sign is that at the time of beginning is controlled, system power supply is switched to the one of no-load transformer by switching voltage frequency control system
Secondary side, FREQUENCY CONTROL is carried out to supply voltage, and output changes the supply voltage after frequency；After reaching finishing control condition, cut-out
Connection between switching voltage frequency control system and transformer, system power supply, and by system power supply directly with transformer once
Side is directly connected to, and terminates whole switching voltage frequency control process.
3. a kind of transformer excitation flow suppressing method based on switching voltage FREQUENCY CONTROL, it is characterized in that, including：
(1) transformer remanent magnetism size and direction before detection is closed a floodgate, control time started, end time, control termination condition are set
Parameter；
(2) control function is generated according to predetermined control principle, calculates each parameter of control function；
(3) frequency of system power source voltage is changed according to control function；By the control source after change frequency to transformation
The primary side of device；
(4) after reaching control termination condition, electric voltage frequency control terminates, and the input voltage of transformer primary side is changed into system power supply
Voltage.
4. a kind of transformer excitation flow suppressing method based on switching voltage FREQUENCY CONTROL as claimed in claim 3, it is special
Sign is, in the step (1), transformer flux frequency when control termination condition refers to finishing control is equal to power frequency.
5. a kind of transformer excitation flow suppressing method based on switching voltage FREQUENCY CONTROL as claimed in claim 3, it is special
Sign is that in the step (2), control principle is：Make the magnetic flux of transformer core any time by control input electric voltage frequency
No more than transformer saturation flux.
6. a kind of transformer excitation flow suppressing method based on switching voltage FREQUENCY CONTROL as claimed in claim 3, it is special
Sign is that in the step (2), the control function of generation is：
f(t)=fm(2-eat)；
Wherein, a ＞ 0, fm>=50, a, fmAmount respectively to be set.
7. a kind of transformer excitation flow suppressing method based on switching voltage FREQUENCY CONTROL as claimed in claim 6, it is special
Sign is the f in control functionmDetermine the initial value of frequency：fmBigger, initial frequency is bigger, and magnetic flux amplitude initial value is smaller.
8. a kind of transformer excitation flow suppressing method based on switching voltage FREQUENCY CONTROL as claimed in claim 7, it is special
Sign is fmObtained when switching angle closes a floodgate with remanent magnetism least favorable situation, i.e., transformer transient magnetic flux is equal to the limit of saturation flux
In the case of obtain,
<mrow>
<msub>
<mi>f</mi>
<mi>m</mi>
</msub>
<mo>=</mo>
<msqrt>
<mrow>
<mfrac>
<mrow>
<msup>
<msub>
<mi>U</mi>
<mi>m</mi>
</msub>
<mn>2</mn>
</msup>
</mrow>
<mrow>
<msup>
<mi>&pi;</mi>
<mn>2</mn>
</msup>
<msup>
<msub>
<mi>N</mi>
<mn>1</mn>
</msub>
<mn>2</mn>
</msup>
<msup>
<mrow>
<mo>(</mo>
<mn>1.1</mn>
<msub>
<mi>&phi;</mi>
<mrow>
<mi>s</mi>
<mi>a</mi>
<mi>t</mi>
</mrow>
</msub>
<mo>-</mo>
<msub>
<mi>&phi;</mi>
<mn>0</mn>
</msub>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
</mrow>
</mfrac>
<mo>-</mo>
<mfrac>
<mrow>
<msup>
<msub>
<mi>R</mi>
<mn>1</mn>
</msub>
<mn>2</mn>
</msup>
</mrow>
<mrow>
<mn>4</mn>
<msup>
<mi>&pi;</mi>
<mn>2</mn>
</msup>
<msup>
<msub>
<mi>L</mi>
<mi>&mu;</mi>
</msub>
<mn>2</mn>
</msup>
</mrow>
</mfrac>
</mrow>
</msqrt>
<mo>;</mo>
</mrow>
Wherein, UmFor system power supply amplitude, N1For the transformer first side winding number of turn, R1For transformer first side winding resistance, Lμ
For transformer magnetizing inductance, φ0For transformer remanent magnetism, φsat=1.26 φN, φNFor rated flux.
9. a kind of transformer excitation flow suppressing method based on switching voltage FREQUENCY CONTROL as claimed in claim 6, it is special
Sign is that a in control function determines the rate of change of electric voltage frequency：The decay of the bigger frequencies of a is faster；A value is in control process
By ΔtAt the end of time, frequency function is made to be obtained equal to power frequency,
<mrow>
<mi>a</mi>
<mo>=</mo>
<mfrac>
<mrow>
<mi>l</mi>
<mi>n</mi>
<mrow>
<mo>(</mo>
<mn>2</mn>
<mo>-</mo>
<mfrac>
<mn>50</mn>
<msub>
<mi>f</mi>
<mi>m</mi>
</msub>
</mfrac>
<mo>)</mo>
</mrow>
</mrow>
<mrow>
<mi>&Delta;</mi>
<mi>t</mi>
</mrow>
</mfrac>
<mo>;</mo>
</mrow>
Wherein, ΔtFor the duration of electric voltage frequency control process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610257822.7A CN105914710B (en) | 2016-04-22 | 2016-04-22 | Transformer excitation flow suppression system and method based on switching voltage FREQUENCY CONTROL |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610257822.7A CN105914710B (en) | 2016-04-22 | 2016-04-22 | Transformer excitation flow suppression system and method based on switching voltage FREQUENCY CONTROL |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105914710A CN105914710A (en) | 2016-08-31 |
| CN105914710B true CN105914710B (en) | 2018-03-06 |
Family
ID=56751874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610257822.7A Expired - Fee Related CN105914710B (en) | 2016-04-22 | 2016-04-22 | Transformer excitation flow suppression system and method based on switching voltage FREQUENCY CONTROL |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105914710B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107102229B (en) * | 2017-05-26 | 2020-09-11 | 国家电网公司 | Method for realizing transformer model for no-load switching transient calculation |
| CN109800522B (en) * | 2019-01-28 | 2023-04-07 | 国网山东省电力公司电力科学研究院 | Method for evaluating stress influence of no-load closing excitation inrush current on transformer winding |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101702361A (en) * | 2009-11-17 | 2010-05-05 | 430000武汉市长江电气发展有限公司 | Ultra-low frequency alternating-current (AC) constant-current demagnetization device of large transformer or mutual inductor and demagnetization detection method |
| CN102403694A (en) * | 2011-09-21 | 2012-04-04 | 山东大学 | Transformer protection method and protection device with exciting inrush current restrain and switch parameter detection |
| CN103956722A (en) * | 2014-05-19 | 2014-07-30 | 上海交通大学 | Ship transformer excitation surge current restraining device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8310106B2 (en) * | 2006-11-29 | 2012-11-13 | Kabushiki Kaisha Toshiba | Magnetizing inrush current suppression device and method for transformer |
| JP5459666B2 (en) * | 2010-01-28 | 2014-04-02 | 株式会社東芝 | Excitation current suppression device |
-
2016
- 2016-04-22 CN CN201610257822.7A patent/CN105914710B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101702361A (en) * | 2009-11-17 | 2010-05-05 | 430000武汉市长江电气发展有限公司 | Ultra-low frequency alternating-current (AC) constant-current demagnetization device of large transformer or mutual inductor and demagnetization detection method |
| CN102403694A (en) * | 2011-09-21 | 2012-04-04 | 山东大学 | Transformer protection method and protection device with exciting inrush current restrain and switch parameter detection |
| CN103956722A (en) * | 2014-05-19 | 2014-07-30 | 上海交通大学 | Ship transformer excitation surge current restraining device |
Non-Patent Citations (1)
| Title |
|---|
| 基于合闸控制策略的变压器励磁涌流抑制措施研究;沃建栋等;《电力系统保护与控制》;20101116;第38卷(第22期);第32-36页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105914710A (en) | 2016-08-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101414528B (en) | Incoming current suppression device | |
| CN104319757B (en) | The arc suppression coil device and method of active component in compensation single-phase earth fault current | |
| EP2346132A1 (en) | Fast three-phase reclosing method in shunt reactor compensated transmission lines | |
| CN110544931B (en) | Earth fault current compensation system and method for self-generating power phase power supply | |
| CN105375532A (en) | Fault phase selection method for double-fed wind power plant tie line | |
| CN105870894B (en) | Transformer excitation flow suppression system and method based on the control of switching voltage amplitude | |
| CN110544929B (en) | Earth fault current compensation system and method for self-generating power phase power supply | |
| CN110571778A (en) | Earth fault current compensation system and method for self-generating power phase power supply | |
| CN105914710B (en) | Transformer excitation flow suppression system and method based on switching voltage FREQUENCY CONTROL | |
| CN205544246U (en) | Static exciter restraint system that shoves based on control of combined floodgate voltage amplitude | |
| CN103730889B (en) | The minimum Time Calculation method of moving back of throwing of large volume main switching-on resistance | |
| Hou et al. | Adaptive active voltage-type arc suppression strategy considering the influence of line parameters in active distribution network | |
| CN105186469B (en) | It is classified controlled reactor variable quantity zero sequence excessively stream inter-turn protection method | |
| CN104483639B (en) | Residual magnetism estimation method for non-fault tripping of YNd11 type three-phase combined transformer | |
| CN206313442U (en) | Suppression device for secondary harmonic current | |
| CN104052080A (en) | Method for forecasting voltage sags generated by excitation inrush current of transformer | |
| CN103779835A (en) | Transformer winding turn-to-turn short circuit relay protection method based on iron loss reactive power characteristic | |
| CN109546636B (en) | Control method and system for shore power variable frequency power supply to inhibit transformer no-load closing excitation inrush current | |
| CN104638631B (en) | A kind of DC current amplitude limit method of direct-current solitary island power transmission system | |
| Chen et al. | The inrush current analysis and restraining method of energizing no-load transformer | |
| CN104459578B (en) | The remanent magnetism method of estimation of Yyn0 type three-phase group formula transformator non-faulting tripping operations | |
| CN112562965B (en) | Pre-magnetizing method for serially connecting small-capacity transformer on marine nuclear power platform | |
| CN110838716B (en) | Transformer starting impact current suppression system and method | |
| Yuan et al. | Research of the transformer energization control strategy applied for storage-based wind farm self-start | |
| CN114884028A (en) | Optimal harmonic elimination current calculation and implementation method for inhibiting ferromagnetic resonance |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180306 Termination date: 20200422 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |