CN108092261A - Combined floodgate mode selection method, device and the storage medium of cascade transformer - Google Patents
Combined floodgate mode selection method, device and the storage medium of cascade transformer Download PDFInfo
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- CN108092261A CN108092261A CN201711244361.0A CN201711244361A CN108092261A CN 108092261 A CN108092261 A CN 108092261A CN 201711244361 A CN201711244361 A CN 201711244361A CN 108092261 A CN108092261 A CN 108092261A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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Abstract
The present invention provides the combined floodgate mode selection method and device of a kind of cascade transformer, this method includes：The excitation surge current value exported in the combined floodgate mode of cascade transformer fixed in input voltage, two or more by stage transformer is determined using the Transformer Close operation mathematical model pre-established；A kind of combined floodgate mode is selected from the combined floodgate mode of described two above cascade transformers according to definite excitation surge current value.It by the present invention, solves the problems, such as to generate larger excitation surge current during a variety of cascade transformer closing operations present in correlation technique so as to influence system stability, and then obtains reducing the advantageous effect of the optimal closing operation mode of combined floodgate excitation surge current.
Description
Technical field
The present invention relates to a kind of Transformer Close technologies, are selected in particular to a kind of combined floodgate mode of cascade transformer
Selection method, device and storage medium.
Background technology
In order to improve the power supply reliability to power consumer, reduce influence journey of the power supply failure to user's normal life
Degree will generally be adopted as power consumer and individually carry out emergency service for the method with stand-by power supply.It is supplied to power consumer
When electric, emergency service is carried out, it is necessary to which enabling stand-by power supply carries out emergency service in case of alternating current dead electricity will enable stand-by power supply.Start
Emergency power supply system need to carry out closing operation, the cascade transformation generated in the operating process to the cascade transformer in system structure
Device inrush phenomenon not only directly affects closing operation scheme, and excessive excitation surge current also easily causes the differential protection malfunction of transformer
Make, influence system run all right.
Since cascade transformer closing operation is there are a variety of combined floodgate investing methods, different investing methods can generate different journeys
The inrush current of transformer of degree, so can not accurately be estimated to the size shoved generated in cascade transformer making process.It can not estimate
Size of shoving in meter closing operation has very big directive significance to determining that optimal emergency service Transformer Close puts into scheme,
The selection of closing operation scheme will be directly affected.
In actual engineering site operating process, for same emergency power supply system, usually there are the conjunctions of a variety of transformers
Lock investing method, and the size of shoving that different combined floodgate modes generates is also different, it is therefore desirable to it is right to be passed through using appropriate method
The size of shoving of different closing operations is analyzed, and finally therefrom selects the best combined floodgate scheme of effect.
At present, controlled closing technology, phase selection division are often used for the excitation surge current that single transformer idle-loaded switching-on generates
Lock method is weakened；It is carried out for the excitation surge current that transformer switch in load generates using the method for building nonlinear mathematical model
Simulation analysis.But at the scene in the operation of engineering, what is often faced is the situation of more Transformer Closes, for more transformations
Device is in parallel to close a floodgate, and due to the influence of system impedance, magnetic linkage interacts between shunt transformer so that magnetic flux weakens, with change
Depressor parallel connection number increases, and single transformer inrush phenomenon reduces.Existing method cannot provide most preferably for specific system structure
Emergency service combined floodgate scheme, do not possess engineering practicability.
For the above-mentioned problems in the prior art, there has been no propose effective solution at present.
The content of the invention
An embodiment of the present invention provides combined floodgate mode selection method, device and the storage medium of a kind of cascade transformer, with
It at least solves to generate larger excitation surge current during a variety of cascade transformer closing operations present in correlation technique so as to influence system
The problem of stability.
According to one embodiment of present invention, a kind of combined floodgate mode selection method of cascade transformer is provided, including：Profit
Determine that cascade fixed in input voltage, two or more becomes with the Transformer Close operation mathematical model pre-established
The excitation surge current value exported in the combined floodgate mode of depressor by stage transformer；According to definite excitation surge current value from it is described two with
On cascade transformer combined floodgate mode in select a kind of combined floodgate mode.
Optionally, the combined floodgate mode of described two above cascade transformers includes following at least two mode：Two changes
Depressor cascades idle-loaded switching-on mode, and two transformer stages join switch in load mode, secondary transformer switch in load mode and two
Grade transformer during no-load closing mode.
Optionally, when the combined floodgate mode of the cascade transformer cascades idle-loaded switching-on mode for two transformers,
It determines by the excitation surge current value of stage transformer output to be included in two transformers cascade idle-loaded switching-on mode：To be described
In first time after cascade transformer input voltage, two changes described in Transformer Close operation mathematical model simulation are utilized
Depressor cascades idle-loaded switching-on, determines the excitation surge current of stage transformer；Within the second time after inputting the voltage, institute is utilized
The load that Transformer Close operation mathematical model simulation puts into predetermined resistance value on secondary transformer is stated, determines the level-one transformation
The variable condition of the excitation surge current of device, wherein, second time is more than the first time.
Optionally, when the combined floodgate mode of the cascade transformer joins switch in load mode for two transformer stages, determine
Included in two transformer stages connection switch in load mode by the excitation surge current value of stage transformer output：For the cascade
In first time after transformer input voltage, two transformers described in Transformer Close operation mathematical model simulation are utilized
Switch in load is cascaded, determines the excitation surge current of stage transformer；After the excitation surge current of the stage transformer is determined, record
The variable condition of the excitation surge current of the stage transformer.
Optionally, when the combined floodgate mode of the cascade transformer is the secondary transformer switch in load mode, determine
The excitation surge current value exported in the secondary transformer switch in load mode by stage transformer includes：For the cascade transformation
In first time after device input voltage, closed using Transformer Close operation mathematical model simulation stage transformer is unloaded
Lock determines the excitation surge current of stage transformer；Within the 3rd time after inputting the voltage, grasped using the Transformer Close
Make mathematical model simulation secondary transformer switch in load, determine the new excitation surge current of stage transformer, wherein, when the described 3rd
Between be more than the first time；After the new excitation surge current of the stage transformer is determined, the stage transformer is recorded
Excitation surge current variable condition.
Optionally, when the combined floodgate mode of the cascade transformer is secondary transformer idle-loaded switching-on mode, determine described
The excitation surge current value exported in secondary transformer idle-loaded switching-on mode by stage transformer includes：For the cascade transformer it is defeated
Enter in the first time after voltage, operate mathematical model simulation stage transformer idle-loaded switching-on using the Transformer Close, really
Determine the excitation surge current of stage transformer；Within the 3rd time after inputting the voltage, the Transformer Close operand is utilized
Model emulation secondary transformer idle-loaded switching-on is learned, determines the new excitation surge current of stage transformer, wherein, the 3rd time is big
In the first time；Within the second time after inputting the voltage, imitated using Transformer Close operation mathematical model
The load of predetermined resistance value is very put on secondary transformer, determines the variable condition of the excitation surge current of the stage transformer,
In, second time is more than the 3rd time.
According to another embodiment of the invention, a kind of cascade transformer combined floodgate mode selection device is provided, including：Really
Cover half block, it is fixed in input voltage for being determined using the Transformer Close operation mathematical model pre-established, two
Kind or more cascade transformer combined floodgate mode in by stage transformer export excitation surge current value；Selecting module, for basis
Definite excitation surge current value selects a kind of combined floodgate mode from the combined floodgate mode of described two above cascade transformers.
Optionally, the combined floodgate mode of described two above cascade transformers includes following at least two mode：Two changes
Depressor cascades idle-loaded switching-on mode, and two transformer stages join switch in load mode, secondary transformer switch in load mode and two
Grade transformer during no-load closing mode.
According to still another embodiment of the invention, a kind of storage medium is additionally provided, the storage medium includes storage
Program, wherein, described program performs method described in any one of the above embodiments when running.
According to still another embodiment of the invention, a kind of electronic device is additionally provided, including memory, processor and storage
On the memory and the computer program that can run on the processor, wherein, the processor passes through the calculating
Machine program performs the method described in any of the above-described.
By the present invention, due to operating mathematical model by the Transformer Close pre-established, powered using stand-by power supply
Afterwards, it is fixed in input voltage, it analyzes by comparing in the combined floodgate mode of two or more cascade transformers by level-one
The variable condition of the excitation surge current value of transformer output, and then select one from the combined floodgate mode of cascade transformer more than the two
The optimal emergency service combined floodgate mode of kind.Therefore, a variety of cascade transformer closing operations present in correlation technique can be solved
When lead to the problem of larger excitation surge current so as to influence system stability, and then obtain reducing combined floodgate excitation surge current most
The advantageous effect of good closing operation mode.
Description of the drawings
Attached drawing described herein is used for providing a further understanding of the present invention, forms the part of the application, this hair
Bright schematic description and description does not constitute improper limitations of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 is a kind of flow chart of cascade transformer combined floodgate mode selection method according to embodiments of the present invention；
Fig. 2 is a kind of emergency power supply system structure chart according to embodiments of the present invention；
Fig. 3 is a kind of cascade transformer inrush phenomenon simulation model figure according to embodiments of the present invention；
Fig. 4 is the schematic diagram of the two transformers cascade idle-loaded switching-on model provided according to embodiments of the present invention；
Fig. 5 is the T-shaped equivalent circuit diagram of the two transformers cascade idle-loaded switching-on provided according to embodiments of the present invention；
Fig. 6 is that stage transformer in two transformers cascade idle-loaded switching-on model according to embodiments of the present invention shoves ripple
Shape figure；
Fig. 7 is secondary transformer switch in load circuit model figure according to embodiments of the present invention；
Fig. 8 is the stage transformer inrush in secondary transformer switch in load model according to embodiments of the present invention
Figure；
Fig. 9 is shoved ripple in stage transformer under two transformers cascade idle-loaded switching-on mode according to embodiments of the present invention
Shape figure；
Figure 10 is to shove under two transformer stages connection switch in load mode according to embodiments of the present invention in stage transformer
Oscillogram；
Figure 11 is in stage transformer inrush under secondary transformer switch in load mode according to embodiments of the present invention
Figure；
Figure 12 is in stage transformer inrush under secondary transformer idle-loaded switching-on mode according to embodiments of the present invention
Figure；
Figure 13 is a kind of structure diagram of cascade transformer combined floodgate mode selection device according to embodiments of the present invention.
Specific embodiment
Come that the present invention will be described in detail below with reference to attached drawing and in conjunction with the embodiments.It should be noted that do not conflicting
In the case of, the feature in embodiment and embodiment in the application can be mutually combined.
It should be noted that term " first " in description and claims of this specification and above-mentioned attached drawing, "
Two " etc. be the object for distinguishing similar, without being used to describe specific order or precedence.
At present, mainly there is transformer cascade zero load for the operation of emergency power supply system start-up course cascade Transformer Close
Combined floodgate etc. is several step by step for combined floodgate, secondary transformer switch in load, transformer stage connection switch in load, two transformers and load, but
It is the problem of these types operation can bring combined floodgate excitation surge current excessive.Single transformer can generate very big in idle-loaded switching-on
Excitation surge current easily causes the malfunction of differential protective device of transformer, influences the stability of system operation；Transformer is in super full
Very big excitation surge current can be also generated with switch in load is carried out during state, is not suitable for engineering site operation.
Fig. 1 is a kind of flow chart of cascade transformer combined floodgate mode selection method according to embodiments of the present invention, such as Fig. 1 institutes
Show, which includes the following steps：
Step S102 is determined using the Transformer Close operation mathematical model pre-established in the fixed situation of input voltage
Under, by the excitation surge current value of stage transformer output in the combined floodgate mode of two or more cascade transformers；
Step S104 selects one according to definite excitation surge current value from the combined floodgate mode of two or more cascade transformers
Kind combined floodgate mode.
By above-mentioned steps, due to operating mathematical model by the Transformer Close pre-established, supplied using stand-by power supply
It is fixed in input voltage after electricity, it analyzes by comparing in the combined floodgate mode of two or more cascade transformers by one
The variable condition of the excitation surge current value of grade transformer output, and then selected from the combined floodgate mode of cascade transformer more than the two
A kind of optimal emergency service combined floodgate mode.Therefore, a variety of cascade transformers combined floodgate behaviour present in correlation technique can be solved
As when lead to the problem of larger excitation surge current so as to influence system stability, and then obtain reducing combined floodgate excitation surge current
The advantageous effect of optimal closing operation mode.
With reference to one kind electricity is provided for load as emergency power supply for diesel generator group by two-stage transformer
The system model of energy is described further.
The emergency power supply system by two diesel generating sets as emergency power supply, cannot be normal to user in alternating current dead electricity
During power supply, emergency power supply comes into operation, and Fig. 2 is a kind of emergency power supply system structure chart provided according to embodiments of the present invention.Such as
Shown in Fig. 2, electric energy is sent through 0.4/10kV transformers and rises to 10kV line voltage grades, then is supplied through 10/0.4kV transformer pressure-reducings
Emergent load uses system construction drawing.
Fig. 3 is for a kind of cascade transformer inrush phenomenon simulation model figure.As shown in figure 3, in figure Generator1 and
Generator2 is diesel generating set module, and including excitation subsystem and speed governing subsystem, rated power is the bavin of 500kVA
Oily generating set sends the electric energy of 400V, 50Hz, and 10kV alternating currents are risen to through 0.4/10kV transformers, then through 10/0.4kV transformers
Decompression is used for emergent load.Breaker1, Breaker2 and Breaker3 are three three-phase breaker controls circuit thereafter
Break-make.Transformer parameter is as follows：
P0=1450W, Pk=6300W, i0=1.4%, SN=630KVA
Saturated characteristic is arranged to：
In an optional embodiment, the combined floodgate mode of two or more cascade transformers includes following at least two side
Formula：Two transformers cascade idle-loaded switching-on mode, and two transformer stages join switch in load mode, secondary transformer switch in load side
Formula and secondary transformer idle-loaded switching-on mode.In the present embodiment, by building a variety of cascade transformations in emergency power supply system
After the combined floodgate mode of device, two transformers cascade idle-loaded switching-on modes, two transformers from theoretical and emulation angle changing rate
Cascade switch in load mode, secondary transformer switch in load mode and secondary transformer idle-loaded switching-on mode these four combined floodgates behaviour
Make the size of excitation surge current produced by stage transformer in mode, optimal cascade transformer closing operation side is finally determined
Formula.
In an optional embodiment, when the combined floodgate mode of cascade transformer cascades idle-loaded switching-on side for two transformers
During formula, determine by the excitation surge current value of stage transformer output to be included in two transformer cascade idle-loaded switching-on modes：For grade
Join in the first time after transformer input voltage, it is empty using the two transformer cascades of Transformer Close operation mathematical model simulation
It carries and closes a floodgate, determine the excitation surge current of stage transformer；In the second time after input voltage, Transformer Close operand is utilized
The load that model emulation puts into predetermined resistance value on secondary transformer is learned, determines the variation shape of the excitation surge current of stage transformer
State, wherein, the second time was more than at the first time.In embodiments of the present invention, when using two transformers cascade idle-loaded switching-on sides
During formula, after stand-by power supply operates mathematical model power supply for Transformer Close, the excitation surge current ripple that stage transformer generates first is emulated
Shape after excitation surge current value reaches certain peak value, puts into the load of predetermined resistance value to increase power, is allowed to gradually decay to normal
Electric current.
In the present embodiment, idle-loaded switching-on model is cascaded using the identical single-phase transformer of bench-types No. two, by two
Transformer cascades idle-loaded switching-on founding mathematical models, and theory analysis is equivalent to draw voltage equation, and from emulation angle to transformer
The excitation surge current of cascade idle-loaded switching-on is emulated and analyzed.
Idle-loaded switching-on operation is cascaded with reference to specific embodiment for two transformers to be further described.
Fig. 4 is the schematic diagram of the two transformers cascade idle-loaded switching-on model provided according to embodiments of the present invention.Such as Fig. 4 institutes
It is shown as the identical single-phase transformer cascade idle-loaded switching-on model of bench-types No. two, the transient state of the transformer cascade idle-loaded switching-on in Fig. 4
Process can use the T-shaped Study on Equivalent Circuit of transformer.Two transformers that embodiment provides cascade the T-shaped equivalent of idle-loaded switching-on
Circuit diagram.
The physical significance of each physical quantity is as follows in Fig. 5：u11、u12：One secondary side voltage of stage transformer；u21、u22：Two level
One secondary side voltage of transformer；i11、i12：One secondary side current of stage transformer；i21、i22：One secondary side of secondary transformer electricity
Stream；R11、R12：One secondary side ohmic leakage of stage transformer；R21、R22：One secondary side ohmic leakage of secondary transformer；Ψm1、Ψm2：One
The main magnetic linkage of secondary transformer；Ψσ11、Ψσ12：One secondary side interlinked leakage of stage transformer；Ψσ21、Ψσ22Secondary transformer one or two times
Side leakage magnetic linkage.Voltage equation is write to circuit 1 and the row of circuit 2, is obtained by Kirchhoff's second law,
There is Ψ=Li for linear branch, it is related with the degree of saturation of magnetic flux for field excitation branch line inductance, remember Lm1=f1
(Ψm1), Lm2=f2(Ψm1), obtain Ψm1=f1(Ψm1)(i11-i12), Ψm2=f2(Ψm2)i12, eliminate magnetic linkage and obtain：
Transformer cascade idle-loaded switching-on mathematical model it is final it is equivalent go out two voltage equations, due to the influence of core sataration,
The magnetizing inductance of two transformers is different and is the function of magnetic linkage, and two differential equations are Differential Equations With Variable Coefficients, with differential side
Journey method is difficult to solve to obtain as a result, the differential equation is turned to algebraic equation by Laplace transform：
Further obtain：
It brings (3) formula into and eliminates i12(s)：
Wherein A=f1(Ψm1)[f2(Ψm2)+2L12]
B=2R12+(R11+R11)[f1(Ψm1)+f2(Ψm2)+2L12]
When the moment closed a floodgate to cascade transformer, in the case of the serious saturation of magnetic flux, magnetizing inductance very little, characteristic equation
Two poles be located in complex plane Left half-plane, the corresponding inverse Laplace transformation result that obtains is the folded of two attenuation components
Add so that the moment of combined floodgate, the excitation surge current that stage transformer generates are very big.
The stage transformer in two transformers cascade idle-loaded switching-on model provided in an embodiment of the present invention is shown in Fig. 6
Inrush figure.In the present embodiment, in the Inrush Simulation model of cascade transformer idle-loaded switching-on, to two transformers
Cascade idle-loaded switching-on mode is emulated.Two transformer cascade idle-loaded switching-on simulation processes are as follows：Breaker1 is opened in emulation
It the 7th second after beginning closes a floodgate, Breaker2 is kept closed, and Breaker3 closes a floodgate at the 9th second, and sky is done to two cascade transformers
Emulation of closing a floodgate is carried, the inrush of stage transformer is as shown in Figure 6 when measuring 7~9 seconds.Two become it can be seen from simulation result
Depressor cascade idle-loaded switching-on causes total peak value that shoves that stage transformer switch in load generates to reach 2702A, is rated current
3 times.
In an optional embodiment, when the combined floodgate mode of cascade transformer joins switch in load side for two transformer stages
During formula, determine by the excitation surge current value of stage transformer output to be included in two transformer stage connection switch in load modes：For grade
Join in the first time after transformer input voltage, be associated with using Transformer Close operation two transformer stages of mathematical model simulation
It carries and closes a floodgate, determine the excitation surge current of stage transformer；After the excitation surge current of stage transformer is determined, stage transformer is recorded
Excitation surge current variable condition.In the present embodiment, it is spare when two transformer stages is selected to be associated with load closing operation mode
Power supply for Transformer Close operate mathematical model power supply after, first emulate stage transformer excitation surge current reach a peak value it
Afterwards, running current is gradually decayed to.
In an optional embodiment, when the combined floodgate mode of cascade transformer is secondary transformer switch in load mode
When, the excitation surge current value for determining to be exported by stage transformer in secondary transformer switch in load mode includes：For cascade transformation
In first time after device input voltage, mathematical model simulation stage transformer idle-loaded switching-on is operated using Transformer Close, really
Determine the excitation surge current of stage transformer；In the 3rd time after input voltage, imitated using Transformer Close operation mathematical model
True secondary transformer switch in load determines the new excitation surge current of stage transformer, wherein, the 3rd time was more than at the first time；
After the new excitation surge current of stage transformer is determined, the variable condition of the excitation surge current of stage transformer is recorded.In this reality
It applies in example, when selecting secondary transformer switch in load mode of operation, stand-by power supply operates mathematical model for Transformer Close and supplies
After electricity, stage transformer idle-loaded switching-on is first emulated, after excitation surge current reaches a peak value, input secondary transformer combined floodgate has load,
The excitation surge current of secondary transformer can be added in stage transformer excitation surge current, reach a total excitation surge current value, afterwards
Gradually decay to running current.
It is further analyzed with reference to a specific embodiment for secondary transformer switch in load model.
Fig. 7 is secondary transformer cascade switch in load circuit model figure according to embodiments of the present invention.Transformer belt loads
The mathematical model of combined floodgate can be studied with transformer equivalent circuit, and circuit model is as shown in fig. 7, transformer primary side is sine
Voltage source, i in figure0For exciting current, RLFor load resistance, two transformer stages in the meaning of other each physical quantitys and a upper section
Join identical in idle-loaded switching-on mathematical model.
It can be obtained by Kirchhoff's second law, the law of electromagnetic induction：
There is Ψ=Li for linear branch, it is related with the degree of saturation of magnetic flux for field excitation branch line inductance, remember Ψm=f2
(Ψm)i0, eliminate magnetic linkage and obtain：
It is obtained through Laplace transform：
Intermediate variable is eliminated to obtain：
Wherein, A1=f2(Ψm2)L21+L21L22+f2(Ψm2)L22
B1=f2(Ψm2)R21+R21L22+(R22+RL)L21+f2(Ψm2)(R22+RL)
The moment of transformer switch in load, iron core are in unsaturated state, and magnetizing inductance is larger, two real roots of characteristic equation
Positioned at complex plane Left half-plane, and it is of different sizes, it is the superposition of two attenuating dc components, but since excitation reactance is larger, electricity
Stream flows mainly through a secondary side winding, shoves smaller；During core sataration, the operating point of magnetic linkage is transferred in saturation point, excitation electricity
Sense becomes very little, and the root of characteristic equation is the double pole on negative real axis, and waveform is first increased to maximum and then is gradually reduced.
Fig. 8 is the stage transformer excitation surge current ripple in secondary transformer switch in load model provided in an embodiment of the present invention
Shape.It is as follows to secondary transformer switch in load simulation process in Transformer Close shown in Fig. 8 shoves simulation model：Such as Fig. 2
Shown, Breaker3 is kept closed, and stage transformer closed a floodgate at the 7th second, and secondary transformer is with 300kW at the 8th second
Load is closed a floodgate, and it is as shown in Figure 8 to measure 8~10 seconds stage transformer inrush.In Fig. 8, due to secondary transformer at the 8th second
There is load to put into, the stage transformer that is added to of shoving makes always to shove peak value for 1692A, gradually decays to normal work electricity afterwards
Stream.
In an optional embodiment, when the combined floodgate mode of cascade transformer is secondary transformer idle-loaded switching-on mode
When, the excitation surge current value for determining to be exported by stage transformer in secondary transformer idle-loaded switching-on mode includes：For cascade transformation
In first time after device input voltage, mathematical model simulation stage transformer idle-loaded switching-on is operated using Transformer Close, really
Determine the excitation surge current of stage transformer；In the 3rd time after input voltage, imitated using Transformer Close operation mathematical model
True secondary transformer idle-loaded switching-on determines the new excitation surge current of stage transformer, wherein, the 3rd time was more than at the first time；
In the second time after input voltage, put into using Transformer Close operation mathematical model simulation on secondary transformer predetermined
The load of resistance value determines the variable condition of the excitation surge current of stage transformer, wherein, the second time was more than for the 3rd time.At this
In embodiment, when selecting secondary transformer idle-loaded switching-on mode of operation, stand-by power supply operates mathematical model for Transformer Close
After power supply, excitation surge current waveform during stage transformer idle-loaded switching-on is first emulated, when the excitation surge current of stage transformer reaches one
After a peak value, then secondary transformer idle-loaded switching-on is put into, excitation surge current, which can be added in stage transformer, obtains total excitation
It shoves value, puts into pure resistor load again afterwards to increase power, be allowed to gradually decay to normal current.
In order to find the closing operation mode that cascade transformer is made to generate excitation surge current minimum, it is of the invention in two transformations
Device cascade idle-loaded switching-on mode, two transformer stage connection switch in load modes, secondary transformer switch in load mode and two level
Transformer during no-load closing mode has carried out simulation analysis respectively, measures under four kinds of cascade transformer combined floodgate modes in stage transformer
The waveform of the excitation surge current of middle generation is as shown in figs. 9 to 12.
Stage transformer inrush during two transformer cascade idle-loaded switching-ons is as shown in figure 9, two changes when emulating the 7th second
Depressor cascades idle-loaded switching-on so that and stage transformer, which shoves, reaches 2224A, at the 9th second, the pure resistor load input of 300kW
So that power increases, running current is gradually decayed to afterwards.
Stage transformer inrush is as shown in Figure 10 during two transformer stage connection switch in load, two when emulating the 7th second
Transformer stage is associated with load and carries combined floodgate so that stage transformer, which shoves, reaches 3065A, gradually decays to running current afterwards.
Stage transformer inrush is as shown in figure 11 during secondary transformer switch in load, level-one transformation when emulating the 7th second
Device idle-loaded switching-on shoves and reaches 1796A, due to the switch in load of secondary transformer at the 8th second, the level-one transformation that is added to of shoving
Device makes always to shove rise for 1418A, gradually decays to running current afterwards.
Stage transformer inrush is as shown in figure 12 during secondary transformer idle-loaded switching-on, level-one transformation when emulating the 7th second
Device idle-loaded switching-on shoves and reaches 1796A, due to the zero load input of secondary transformer at the 8th second, the level-one transformation that is added to of shoving
Device makes always to shove rise for 1418A, and at the 9th second, the pure resistor load of 300kW was put into so that power increase, gradually declines afterwards
It is kept to running current.
According to above simulation analysis as a result, can obtain drawing a conclusion：
It shoves greatly very much 1. transformer during no-load closing can generate, transformer cascade idle-loaded switching-on can be generated than list in practical operation
Platform transformer during no-load closing is more serious to shove.
2. stage transformer puts into operation and enters steady operational status, secondary transformer closes a floodgate with load at this time, institute
Shoving for generating is bigger than single transformer no-load switchon surge.
3. stage transformer is maximum in all combined floodgate modes with shoving caused by secondary transformer and load combined floodgate.
Therefore, it is suggested that actual motion at the scene can be taken in operating first puts into stage transformer, then put into two level transformation
Device and then the mode that load is closed a floodgate is put into, to reduce shoving of generating during Transformer Close.
Through the above description of the embodiments, the present invention is for the emergency power supply system through two cascade transformers, pin
To two transformer cascade idle-loaded switching-on modes, two transformer stage connection switch in load modes, secondary transformer switch in load sides
The analysis for size of shoving is generated in these four combined floodgate modes of formula, secondary transformer idle-loaded switching-on in stage transformer, it is final to formulate
Optimal Transformer Close scheme.
A kind of cascade transformer combined floodgate mode selection device is additionally provided in the present embodiment, which is used to implement above-mentioned
Embodiment and preferred embodiment had carried out repeating no more for explanation.As used below, term " module " can be real
The combination of the software and/or hardware of existing predetermined function.Although following embodiment described device is preferably realized with software,
But the realization of the combination of hardware or software and hardware is also what may and be contemplated.
Figure 13 is a kind of structure diagram of cascade transformer combined floodgate mode selection device according to embodiments of the present invention, is such as schemed
Shown in 13, which includes：Determining module 132, for being determined using the Transformer Close operation mathematical model pre-established
In the case of input voltage is fixed, the excitation exported in the combined floodgate mode of two or more cascade transformers by stage transformer is gushed
Flow valuve；Selecting module 134, for being selected according to definite excitation surge current value from the combined floodgate mode of two or more cascade transformers
Select a kind of combined floodgate mode.
In an optional embodiment, the combined floodgate mode of two or more cascade transformers includes following at least two side
Formula：Two transformers cascade idle-loaded switching-on mode, and two transformer stages join switch in load mode, secondary transformer switch in load side
Formula and secondary transformer idle-loaded switching-on mode.
In an optional embodiment, selecting module 134 includes：
When the combined floodgate mode of cascade transformer cascades idle-loaded switching-on mode for two transformers, two transformer stages are determined
Included in connection idle-loaded switching-on mode by the excitation surge current value of stage transformer output：For after cascade transformer input voltage
In one time, using two transformer cascade idle-loaded switching-ons of Transformer Close operation mathematical model simulation, stage transformer is determined
Excitation surge current；In the second time after input voltage, mathematical model simulation is operated in two level transformation using Transformer Close
The load of predetermined resistance value is put on device, determines the variable condition of the excitation surge current of stage transformer, wherein, the second time was more than the
One time.
When the combined floodgate mode of cascade transformer joins switch in load mode for two transformer stages, two transformer stages are determined
Included in connection switch in load mode by the excitation surge current value of stage transformer output：For after cascade transformer input voltage
In one time, using two transformer stage connection switch in load of Transformer Close operation mathematical model simulation, stage transformer is determined
Excitation surge current；After the excitation surge current of stage transformer is determined, the variable condition of the excitation surge current of stage transformer is recorded.
When the combined floodgate mode of cascade transformer is secondary transformer switch in load mode, determine that secondary transformer has load to close
The excitation surge current value exported in lock mode by stage transformer includes：For the first time after cascade transformer input voltage
It is interior, mathematical model simulation stage transformer idle-loaded switching-on is operated using Transformer Close, determines the excitation surge current of stage transformer；
In the 3rd time after input voltage, mathematical model simulation secondary transformer switch in load is operated using Transformer Close, really
Determine the new excitation surge current of stage transformer, wherein, the 3rd time was more than at the first time；New in definite stage transformer is encouraged
After magnetic shoves, the variable condition of the excitation surge current of stage transformer is recorded.
When the combined floodgate mode of cascade transformer is secondary transformer idle-loaded switching-on mode, determines that secondary transformer is unloaded and close
The excitation surge current value exported in lock mode by stage transformer includes：For the first time after cascade transformer input voltage
It is interior, mathematical model simulation stage transformer idle-loaded switching-on is operated using Transformer Close, determines the excitation surge current of stage transformer；
In the 3rd time after input voltage, mathematical model simulation secondary transformer idle-loaded switching-on is operated using Transformer Close, really
Determine the new excitation surge current of stage transformer, wherein, the 3rd time was more than at the first time；The second time after input voltage
It is interior, the load of predetermined resistance value is put on secondary transformer using Transformer Close operation mathematical model simulation, determines that level-one becomes
The variable condition of the excitation surge current of depressor, wherein, the second time was more than for the 3rd time.
It should be noted that above-mentioned modules can be realized by software or hardware, for the latter, Ke Yitong
In the following manner realization is crossed, but not limited to this：Above-mentioned module is respectively positioned in same processor；Alternatively, above-mentioned modules are with arbitrary
The form of combination is located in different processors respectively.
The embodiment of the present invention additionally provides a kind of storage medium, which includes the program of storage, wherein, it is above-mentioned
Program performs method described in any one of the above embodiments when running.
Optionally, in the present embodiment, above-mentioned storage medium can include but is not limited to：USB flash disk, read-only memory (Read-
Only Memory, referred to as ROM), it is random access memory (Random Access Memory, referred to as RAM), mobile hard
The various media that can store program code such as disk, magnetic disc or CD.
According to still another embodiment of the invention, a kind of electronic device is additionally provided, including memory, processor and storage
On a memory and the computer program that can run on a processor, wherein, processor performs above-mentioned by computer program
The method of one.
Obviously, those skilled in the art should be understood that each module of the above-mentioned present invention or each step can be with general
Computing device realize that they can concentrate on single computing device or be distributed in multiple computing devices and be formed
Network on, optionally, they can be realized with the program code that computing device can perform, it is thus possible to which they are stored
Performed in the storage device by computing device, and in some cases, can be performed with the order being different from herein shown in
The step of going out or describing they are either fabricated to each integrated circuit modules respectively or by multiple modules in them or
Step is fabricated to single integrated circuit module to realize.It to be combined in this way, the present invention is not limited to any specific hardware and softwares.
By cascade transformer combined floodgate mode selection method provided by the invention, clear thinking has effectively accomplished to make number
It learns model and actual conditions is combined, be finally reached the purpose for effectively reducing the size of shoving in transformer, and grasped close to scene
Make situation, there is very strong practical guided significance and actual application value.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All any modifications within the principle of the present invention, made, etc.
With replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of combined floodgate mode selection method of cascade transformer, which is characterized in that including：
Using pre-establish Transformer Close operation mathematical model determine it is fixed in input voltage, it is two or more
The excitation surge current value exported in the combined floodgate mode of cascade transformer by stage transformer；
A kind of combined floodgate side is selected from the combined floodgate mode of described two above cascade transformers according to definite excitation surge current value
Formula.
2. the according to the method described in claim 1, it is characterized in that, combined floodgate mode bag of described two above cascade transformers
Include following at least two mode：Two transformers cascade idle-loaded switching-on mode, and two transformer stages join switch in load mode, two level
Transformer switch in load mode and secondary transformer idle-loaded switching-on mode.
3. according to the method described in claim 2, it is characterized in that, when the combined floodgate mode of the cascade transformer is described two
When transformer cascades idle-loaded switching-on mode, determine to be exported by stage transformer in two transformers cascade idle-loaded switching-on mode
Excitation surge current value include：
Within for the first time after the cascade transformer input voltage, imitated using Transformer Close operation mathematical model
Very described two transformers cascade idle-loaded switching-on determines the excitation surge current of stage transformer；
Within the second time after inputting the voltage, mathematical model simulation is operated in two level transformation using the Transformer Close
The load of predetermined resistance value is put on device, determines the variable condition of the excitation surge current of the stage transformer, wherein, when described second
Between be more than the first time.
4. according to the method described in claim 2, it is characterized in that, when the combined floodgate mode of the cascade transformer is two transformations
When device cascades switch in load mode, encouraging by stage transformer output in two transformer stages connection switch in load mode is determined
Magnetic value of shoving includes：
Within for the first time after the cascade transformer input voltage, imitated using Transformer Close operation mathematical model
Very described two transformer stages connection switch in load determines the excitation surge current of stage transformer；
After the excitation surge current of the stage transformer is determined, the variation shape of the excitation surge current of the stage transformer is recorded
State.
5. according to the method described in claim 2, it is characterized in that, when the combined floodgate mode of the cascade transformer is the two level
During transformer switch in load mode, the excitation for determining to be exported by stage transformer in the secondary transformer switch in load mode is gushed
Flow valuve includes：
Within for the first time after the cascade transformer input voltage, imitated using Transformer Close operation mathematical model
True stage transformer idle-loaded switching-on determines the excitation surge current of stage transformer；
Within the 3rd time after inputting the voltage, mathematical model simulation secondary transformer is operated using the Transformer Close
Switch in load determines the new excitation surge current of stage transformer, wherein, the 3rd time is more than the first time；
After the new excitation surge current of the stage transformer is determined, the variation of the excitation surge current of the stage transformer is recorded
State.
6. according to the method described in claim 2, it is characterized in that, when the combined floodgate mode of the cascade transformer is two level transformation
During device idle-loaded switching-on mode, the excitation surge current value exported in the secondary transformer idle-loaded switching-on mode by stage transformer is determined
Including：
Within for the first time after the cascade transformer input voltage, imitated using Transformer Close operation mathematical model
True stage transformer idle-loaded switching-on determines the excitation surge current of stage transformer；
Within the 3rd time after inputting the voltage, mathematical model simulation secondary transformer is operated using the Transformer Close
Idle-loaded switching-on determines the new excitation surge current of stage transformer, wherein, the 3rd time is more than the first time；
Within the second time after inputting the voltage, mathematical model simulation is operated in two level transformation using the Transformer Close
The load of predetermined resistance value is put on device, determines the variable condition of the excitation surge current of the stage transformer, wherein, when described second
Between be more than the 3rd time.
7. a kind of combined floodgate mode selection device of cascade transformer, which is characterized in that including：
Determining module, for being determined using the Transformer Close operation mathematical model pre-established in the fixed situation of input voltage
Under, by the excitation surge current value of stage transformer output in the combined floodgate mode of two or more cascade transformers；
Selecting module, for being selected according to definite excitation surge current value from the combined floodgate mode of described two above cascade transformers
Select a kind of combined floodgate mode.
8. device according to claim 7, which is characterized in that the combined floodgate mode bag of described two above cascade transformers
Include following at least two mode：Two transformers cascade idle-loaded switching-on mode, and two transformer stages join switch in load mode, two level
Transformer switch in load mode and secondary transformer idle-loaded switching-on mode.
9. a kind of storage medium, which is characterized in that the storage medium includes the program of storage, wherein, when described program is run
Method any one of perform claim requirement 1 to 6.
10. a kind of electronic device, including memory, processor and it is stored on the memory and can transports on the processor
Capable computer program, which is characterized in that the processor performs the claims 1 to 6 by the computer program
Method described in one.
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| CN101567552A (en) * | 2009-06-03 | 2009-10-28 | 昆明理工大学 | Recognition method of magnetizing inrush current and internal short circuit of power transformer by utilizing morphological structure |
| CN103683192A (en) * | 2013-11-06 | 2014-03-26 | 天津瑞能电气有限公司 | Large-capacity phase shift rectification transformer excitation inrush current suppression apparatus and method |
| CN204495925U (en) * | 2015-03-14 | 2015-07-22 | 国网山西省电力公司电力科学研究院 | A kind of cascade transformer sympathetic inrush emulation test system |
| CN106451379A (en) * | 2016-11-08 | 2017-02-22 | 华南理工大学 | Optimization and improvement method for direct-current 50-Hz protection for inrush locking |
| US20170093298A1 (en) * | 2015-09-30 | 2017-03-30 | Eaton Corporation | System and method for starting a variable frequency drive with reduced arc flash risk |
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|---|---|---|---|---|
| CN101567552A (en) * | 2009-06-03 | 2009-10-28 | 昆明理工大学 | Recognition method of magnetizing inrush current and internal short circuit of power transformer by utilizing morphological structure |
| CN103683192A (en) * | 2013-11-06 | 2014-03-26 | 天津瑞能电气有限公司 | Large-capacity phase shift rectification transformer excitation inrush current suppression apparatus and method |
| CN204495925U (en) * | 2015-03-14 | 2015-07-22 | 国网山西省电力公司电力科学研究院 | A kind of cascade transformer sympathetic inrush emulation test system |
| US20170093298A1 (en) * | 2015-09-30 | 2017-03-30 | Eaton Corporation | System and method for starting a variable frequency drive with reduced arc flash risk |
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