CN108020805A - The ferromagnetic resonance determination methods and system of a kind of voltage transformer for electric power distribution network - Google Patents
The ferromagnetic resonance determination methods and system of a kind of voltage transformer for electric power distribution network Download PDFInfo
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- CN108020805A CN108020805A CN201810019629.9A CN201810019629A CN108020805A CN 108020805 A CN108020805 A CN 108020805A CN 201810019629 A CN201810019629 A CN 201810019629A CN 108020805 A CN108020805 A CN 108020805A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
- H02H7/05—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers for capacitive voltage transformers, e.g. against resonant conditions
Abstract
The invention discloses the ferromagnetic resonance determination methods and system of a kind of voltage transformer for electric power distribution network,The isolated neutral distribution network system of voltage transformer is connected in live running environment by simulating,Establish the simulation model of corresponding Ferroresonance Overvoltage Caused by PT,And obtain the fault parameter that may be caused the accident in system at the scene,Failure setting model is added in simulation model according to fault parameter,Then it is the operating parameter in live running environment by the parameter setting in simulation model,And carry out dry run,To obtain operation characteristic parameter,Finally judging simulation model according to the operation characteristic parameter of acquisition, whether there occurs ferromagnetic resonance,So as to judge that the voltage transformer in the distribution network system of isolated neutral is burnt or whether fuse failure is that ferromagnetic resonance causes,So that specific aim carries out accident treatment,It is proposed effective solution,The accident for suppressing voltage transformer occurs again,Improve safe operation of electric network and reliability.
Description
Technical field
The present invention relates to voltage transformer technical field, more particularly to a kind of ferromagnetic resonance of voltage transformer for electric power distribution network to sentence
Disconnected method and system.
Background technology
At present, in the distribution network system of isolated neutral, when system operation is unstable or operation troubles occurs, hold
Easily the voltage transformer in system is caused to burn or the phenomenon of fuse failure, so as to influence the safe operation of system.
However, since distribution substation is without the system such as on-Line Monitor Device, voltage, electric current when the accident that can not be directed to occurs
Parameter is analyzed, situations such as can not also determining the resonance overvoltage of system, lightning surge in accident.Therefore, usually sending out
The voltage transformer of raw system burns or during the accident of fuse failure, can not judge accident occurrence cause, it is difficult to subsequently to avoid
Accident provides effective reference again.
In addition, it is unstable or when operation troubles occurs in system operation, easily so that voltage transformer magnetizing inductance and being
System direct-to-ground capacitance matches, and voltage transformer ferromagnetic resonance caused by iron core saturation frequently occurs.And ferromagnetic resonance may be led
Voltage transformer fuse failure is caused, burns or explodes, therefore, it is necessary to which whether there occurs ferromagnetic when fielded system occurring accident
Resonance, so as to cause, voltage transformer is burnt or the accident of fuse failure is judged, in order to targetedly carry out accident
Processing, proposes effective solution, the accident for suppressing voltage transformer occurs again.
The content of the invention
The present invention provides the ferromagnetic resonance determination methods and system of a kind of voltage transformer for electric power distribution network, solves existing skill
It can not judge to cause voltage transformer to burn in art or whether be that the technology of ferromagnetic resonance is asked the reason for fuse failure accident occurs
Topic.
A kind of ferromagnetic resonance determination methods of voltage transformer for electric power distribution network provided by the invention, including：
According to the parameter of voltage transformer and the parameter of the isolated neutral distribution network systems of the access voltage transformer,
Establish the mathematical model of Ferroresonance Overvoltage Caused by PT and the Type Equivalent Circuit Model of isolated neutral distribution network systems；
According to the mathematical model and the Type Equivalent Circuit Model, established by unified magnetic equivalent circuit UMEC modeling methods
The simulation model of the Ferroresonance Overvoltage Caused by PT；
The operating parameter of isolated neutral distribution network systems when being occurred according to accident, establishes event in the simulation model
Hinder setting model；
The operating parameter in the simulation model is set, and carries out the operation spy that dry run obtains the simulation model
Property parameter, the operation characteristic parameter include busbar voltage, the secondary voltage of the voltage transformer；
Judge whether the simulation model occurs ferromagnetic resonance according to the operation characteristic parameter.
Preferably, it is described to judge whether the simulation model occurs ferromagnetic resonance and specifically wrap according to the operation characteristic parameter
Include：
If the amplitude of the busbar voltage exceedes 1.1 times of normal value and the trend of low-frequency oscillation is presented, and described secondary
Voltage is greater than or equal to 30V, then judges that ferromagnetic resonance occurs for the simulation model, otherwise judge that the simulation model does not occur
Ferromagnetic resonance.
Preferably, the mathematical model is specially：
Wherein, C0For busbar direct-to-ground capacitance, u0For electromagnetic transformer secondary voltage, f (φn) it is electromagnetic transformer primary side
Excitation property, R be electromagnetic transformer resistance；
The Type Equivalent Circuit Model is specially：
Wherein, E1、E2、E3Respectively system power source voltage, L1、L2、L3Respectively voltage transformer magnetizing inductance, E0For in
Property point displacement voltage, ω is constant.
Preferably, the operating parameter of isolated neutral distribution network systems when being occurred according to accident, in the simulation
Failure setting model is established in model to specifically include：
The operating parameter of lighting location and isolated neutral distribution network systems when being occurred according to accident, in the simulation mould
Failure setting model is established in type, the failure setting model includes singlephase earth fault disappearance module, closes unloaded busbar modules
With system loading acute variation analog module.
Preferably, the operating parameter in the setting simulation model includes：
The parameter value of currently running isolated neutral distribution network systems is obtained, and the mould is set according to the parameter value
System equivalent source parameter, direct-to-ground capacitance, capacitive coupling, the structural parameters of voltage transformer and excitation property ginseng in analog model
Number；
The system equivalent source parameter includes system power source voltage and system impedance, the structure ginseng of the voltage transformer
Number includes specified apparent energy, winding connection mode and rated voltage virtual value.
Preferably, the direct-to-ground capacitance set in the simulation model specifically includes：
System capacitive current is measured by capacitor plug-in voltage transformer, obtains system capacitive current measurement
Value, and electricity over the ground is obtained according to the system capacitive current measured value and the mathematical relationship of system capacitive current and direct-to-ground capacitance
Hold, and using the direct-to-ground capacitance as the direct-to-ground capacitance setting value in the simulation model.
A kind of ferromagnetic resonance of voltage transformer for electric power distribution network provided by the invention judges system, including：
First establishes module, and the neutral point for the parameter according to voltage transformer and the access voltage transformer does not connect
The parameter of ground distribution network systems, establishes the mathematical model of Ferroresonance Overvoltage Caused by PT and the equivalence of isolated neutral distribution network systems
Circuit model；
Second establishes module, for according to the mathematical model and the Type Equivalent Circuit Model, passing through unified magnetic equivalent electric
Road UMEC modeling methods establish the simulation model of the Ferroresonance Overvoltage Caused by PT；
3rd establishes module, the operating parameter of isolated neutral distribution network systems during for being occurred according to accident, in institute
State and failure setting model is established in simulation model；
Analog module, for setting the operating parameter in the simulation model, and carries out dry run and obtains the mould
The operation characteristic parameter of analog model, the operation characteristic parameter include busbar voltage, the secondary voltage of the voltage transformer；
Judgment module, for judging whether the simulation model occurs ferromagnetic resonance according to the operation characteristic parameter.
Preferably, the judgment module includes：
Judging unit, if the amplitude for the busbar voltage exceedes 1.1 times of normal value and becoming for low-frequency oscillation is presented
Gesture, and the secondary voltage are greater than or equal to 30V, then judge that ferromagnetic resonance occurs for the simulation model, otherwise judge the mould
Ferromagnetic resonance does not occur for analog model.
Preferably, the described 3rd establish module and specifically include：
Unit is established, the operating parameter of lighting location and isolated neutral distribution network systems when being occurred according to accident,
Failure setting model is established in the simulation model, the failure setting model includes singlephase earth fault disappearance module, closes sky
Carry busbar modules and system loading acute variation analog module.
Preferably, the analog module includes：
Parameter acquiring unit, for obtaining the parameter value of currently running isolated neutral distribution network systems, and according to institute
State parameter value and set system equivalent source parameter in the simulation model, direct-to-ground capacitance, capacitive coupling, the knot of voltage transformer
Structure parameter and excitation property parameter；
The system equivalent source parameter includes system power source voltage and system impedance, the structure ginseng of the voltage transformer
Number includes specified apparent energy, winding connection mode and rated voltage virtual value.
As can be seen from the above technical solutions, the present invention has the following advantages：
It is connected to the isolated neutral distribution network system of voltage transformer in the present invention in live running environment by simulating,
The simulation model of corresponding Ferroresonance Overvoltage Caused by PT is established, and obtains what may be caused the accident in system at the scene
Fault parameter, failure setting model is added according to fault parameter in simulation model, then by the parameter setting in simulation model
For the operating parameter in live running environment, and dry run is carried out, to obtain operation characteristic parameter, finally according to the fortune of acquisition
Whether row characterisitic parameter judges simulation model there occurs ferromagnetic resonance, so that in judging the distribution network system of isolated neutral
Voltage transformer is burnt or whether fuse failure is that ferromagnetic resonance causes, and so that specific aim carries out accident treatment, proposes effectively solution
Certainly measure, the accident for suppressing voltage transformer occur again, improve safe operation of electric network and reliability.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also
To obtain other attached drawings according to these attached drawings.
Fig. 1 is that a kind of flow of the ferromagnetic resonance determination methods of voltage transformer for electric power distribution network provided in an embodiment of the present invention is shown
It is intended to；
Fig. 2 is a kind of Type Equivalent Circuit Model schematic diagram of isolated neutral distribution network systems provided in an embodiment of the present invention；
Fig. 3 is a kind of simplification circuit model schematic of isolated neutral distribution network systems provided in an embodiment of the present invention；
Fig. 4 is a kind of exciting characteristic curve schematic diagram of voltage transformer provided in an embodiment of the present invention；
Fig. 5 is a kind of schematic diagram of the simulation model of Ferroresonance Overvoltage Caused by PT provided in an embodiment of the present invention；
Fig. 6 carries out system capacitive current using the plug-in voltage transformer of capacitor for one kind provided in an embodiment of the present invention
The connection principle schematic diagram of measurement；
Fig. 7 is a kind of test schematic diagram of the plug-in voltage transformer of capacitor provided in an embodiment of the present invention；
Fig. 8 is the waveform diagram of the busbar voltage that dry run obtains in simulation model provided in an embodiment of the present invention；
Fig. 9 is the secondary voltage for the voltage transformer that dry run obtains in simulation model provided in an embodiment of the present invention
Oscillogram；
Figure 10 is the structure that a kind of ferromagnetic resonance of voltage transformer for electric power distribution network provided in an embodiment of the present invention judges system
Schematic diagram.
Embodiment
An embodiment of the present invention provides the ferromagnetic resonance determination methods and system of a kind of voltage transformer for electric power distribution network, for solving
It can not certainly judge to cause voltage transformer to burn in the prior art or whether the reason for fuse failure accident occurs is ferromagnetic resonance
Technical problem.
Goal of the invention, feature, advantage to enable the present invention is more obvious and understandable, below in conjunction with the present invention
Attached drawing in embodiment, is clearly and completely described the technical solution in the embodiment of the present invention, it is clear that disclosed below
Embodiment be only part of the embodiment of the present invention, and not all embodiment.Based on the embodiments of the present invention, this area
All other embodiment that those of ordinary skill is obtained without making creative work, belongs to protection of the present invention
Scope.
Referring to Fig. 1, Fig. 1 is a kind of ferromagnetic resonance judgement side of voltage transformer for electric power distribution network provided in an embodiment of the present invention
The flow diagram of method.
A kind of ferromagnetic resonance determination methods of voltage transformer for electric power distribution network provided by the invention, including：
S101, the ginseng according to the parameter of voltage transformer and the isolated neutral distribution network systems for accessing voltage transformer
Number, establishes the mathematical model of Ferroresonance Overvoltage Caused by PT and the Type Equivalent Circuit Model of isolated neutral distribution network systems.
It is understood that the ferromagnetic resonance determination methods provided in the embodiment of the present invention are in being directed in power distribution network
Property point isolated neutral system, therefore can first according to scene access voltage transformer parameter and the isolated neutral system
The specific mode of connection and circuit parameter establish mathematical model and the isolated neutral distribution system of Ferroresonance Overvoltage Caused by PT
The Type Equivalent Circuit Model of system.
Wherein, the mathematical model of Ferroresonance Overvoltage Caused by PT can be based on Kirchhoff's second law and kirchhoff electricity
Stream law is established.It is assumed that the coil flux of voltage transformer is respectivelyThe once electricity of voltage transformer
Stream is respectively i1、i2、i3, the secondary current of voltage transformer is i0.And set ia、ib、icThe respectively excitation of voltage transformer
Electric current, the exciting characteristic curve of voltage transformer primary side can be expressed as i=f (φ), therefore, can obtain such as following formula (1)：
Formula (1) is represented by by deformation：
Due to being 0 to the sum of earth-current, i.e. capacitive earth current iC1、iC2、iC3With voltage transformer primary current i1、i2、
i3The sum of be 0, then iC1+iC2+iC3+i1+i2+i3=0.Assuming that three-phase ground capacitance is C0, due to iC=C0× du/dt, therefore
It can obtain formula (3)：
It is available that deformation is carried out by formula (3)：
Formula (2) is substituted into formula (4), can be obtained：
Formula (5) is deformed, formula (6) can be obtained：
Wherein, formula (6) is the mathematical model of Ferroresonance Overvoltage Caused by PT.
, can be according to the neutral point in live running environment after the mathematical model of Ferroresonance Overvoltage Caused by PT is obtained
The mathematical model of earth-free distribution network systems and Ferroresonance Overvoltage Caused by PT, establishes the equivalence electricity of isolated neutral distribution network systems
Road model.As shown in Figures 2 and 3, Fig. 2 is a kind of equivalence electricity of isolated neutral distribution network systems provided in an embodiment of the present invention
Road model schematic, Fig. 3 show for a kind of simplification circuit model of isolated neutral distribution network systems provided in an embodiment of the present invention
It is intended to.When the open-delta open circuit of voltage transformer secondary side, according to Kirchhoff's first law, can write out such as lower section
Formula：
After being arranged to formula (7), E0It is represented by：
Wherein, E1、E2、E3Respectively system power source voltage, L1、L2、L3Respectively voltage transformer magnetizing inductance, E0For in
Property point displacement voltage, ω is constant.
From formula (8), under system normal operation, three-phase keeps balance, then can solve neutral-point displacement E0=
0.When system disturbs, such as singlephase earth fault disappears, closes unloaded busbar or system loading acute variation etc. so that certain
One phase or two-phase voltage rise, can cause voltage transformer iron core saturation.Fig. 4 can be referred to, Fig. 4 provides for the embodiment of the present invention
A kind of voltage transformer exciting characteristic curve schematic diagram.It is mutual from voltage transformer exciting characteristic curve, voltage in Fig. 4
Magnetizing inductance L after the iron core saturation of sensoriReduce, when magnetizing inductance is decreased to and direct-to-ground capacitance C0When matching, iron may result in
Magnetic resonance, so as to produce overcurrent and overvoltage.
S102, according to mathematical model and Type Equivalent Circuit Model, pass through unified magnetic equivalent circuit UMEC modeling methods and establish electricity
Press the simulation model of mutual inductor ferromagnetic resonance.
It is understood that wrapped in the simulation model for the Ferroresonance Overvoltage Caused by PT established by UMEC modeling methods
The modules such as system power supply module, direct-to-ground capacitance module, capacitive coupling module and electromagnetic potential transformer module are included.System electricity
Source module is equivalent using ideal voltage source parallel system impedance progress, and system impedance can be calculated according to system short-circuit electric current.Adopt
When being modeled with UMEC equivalent modeling methods, the Coupling Between Phases of voltage transformer, i.e. interacting between winding are included in, and iron
Heart saturated characteristic is represented by inputting the form of V-I curves.Specifically, Fig. 5 can be referred to, Fig. 5 carries for the embodiment of the present invention
A kind of schematic diagram of the simulation model of the Ferroresonance Overvoltage Caused by PT supplied.
The operating parameter of S103, isolated neutral distribution network systems when being occurred according to accident, are established in simulation model
Failure setting model.
Due to voltage transformer burn or the generation of fuse failure accident mostly due in system operation there occurs
Certain failure, therefore after simulation model is established, can be according to the isolated neutral distribution network systems in site environment
The failure that may occur establishes corresponding failure setting model in simulation model, is broken down with this to simulate in simulation model
When situation.The operating parameter of lighting location and isolated neutral distribution network systems when being occurred according to accident, in simulation model
In establish failure setting model, failure setting model includes singlephase earth fault disappearance module, closes unloaded busbar modules and system
Load acute variation analog module, can run simulation system by above-mentioned module in simulation model and singlephase earth fault occurs
Disappearance, the situation for closing unloaded busbar or system loading acute variation.
Operating parameter in S104, setting simulation model, and carry out the operation characteristic that dry run obtains simulation model
Parameter, operation characteristic parameter include busbar voltage, the secondary voltage of voltage transformer.
In the operating parameter in setting simulation model, the neutral point run in current live environment can be first obtained not
The parameter value of distribution network systems is grounded, and system equivalent source parameter, direct-to-ground capacitance, phase in simulation model are set according to parameter value
Between capacitance, the structural parameters of voltage transformer and excitation property parameter；Wherein, system equivalent source parameter includes system power supply electricity
Pressure and system impedance, the structural parameters of voltage transformer are effective including specified apparent energy, winding connection mode and rated voltage
Value.
In above-mentioned parameter, one of an important factor for when direct-to-ground capacitance causes Ferroresonance Overvoltage Caused by PT, and live ring
Direct-to-ground capacitance in the system in border is generally difficult to directly obtain, in embodiments of the present invention can be mutual by the plug-in voltage of capacitor
Sensor measures system capacitive current, obtain system capacitive current measured value, and according to system capacitive current measured value with
And the mathematical relationship of system capacitive current and direct-to-ground capacitance obtains direct-to-ground capacitance, and using direct-to-ground capacitance as pair in simulation model
Ground capacitance settings value.Used specifically, Fig. 6 and Fig. 7, Fig. 6 can be referred to for one kind provided in an embodiment of the present invention outside capacitor
The connection principle schematic diagram that voltage transformer measures system capacitive current is hung, Fig. 7 is provided in an embodiment of the present invention one
The test schematic diagram of the kind plug-in voltage transformer of capacitor.
After system capacitive current is measured, direct-to-ground capacitance can be asked for by formula (9).
Wherein, Ic is system capacitive current, and C is direct-to-ground capacitance；For system phase voltage；ω is angular frequency.In addition, phase
Between capacitance can be asked for accordingly according to direct-to-ground capacitance, capacitive coupling it is general can using value as direct-to-ground capacitance 0.1~
0.3 times.
S105, according to operation characteristic parameter judge whether simulation model occurs ferromagnetic resonance.
Finally, the operation characteristic parameter that can be obtained according to dry run, such as busbar voltage, the secondary electricity of voltage transformer
Whether pressure, occur ferromagnetic resonance to simulation model and judge.As shown in Figure 8 and Figure 9, Fig. 8 is provided in an embodiment of the present invention
The waveform diagram for the busbar voltage that dry run obtains in simulation model, Fig. 9 is simulation model provided in an embodiment of the present invention
The oscillogram of the secondary voltage for the voltage transformer that middle dry run obtains.Wherein, deterministic process is specifically as follows：If busbar is electric
The amplitude of pressure exceedes 1.1 times of normal value and the trend of low-frequency oscillation is presented, and secondary voltage is greater than or equal to 30V, then judges
Ferromagnetic resonance occurs for simulation model, otherwise judges that ferromagnetic resonance does not occur for simulation model.
It is connected to the isolated neutral distribution of voltage transformer in the embodiment of the present invention in live running environment by simulating
Net system, establishes the simulation model of corresponding Ferroresonance Overvoltage Caused by PT, and obtains in system at the scene and may cause thing
Therefore the fault parameter occurred, failure setting model is added in simulation model according to fault parameter, then by simulation model
Parameter setting is the operating parameter in live running environment, and carries out dry run, to obtain operation characteristic parameter, last basis
Whether the operation characteristic parameter of acquisition judges simulation model there occurs ferromagnetic resonance, so as to judge the power distribution network of isolated neutral
Voltage transformer in system is burnt or whether fuse failure is that ferromagnetic resonance causes, and so that specific aim carries out accident treatment, is carried
Go out effective solution, the accident for suppressing voltage transformer occurs again, improves safe operation of electric network and reliability.Due to this
By modeling Simulation when in inventive embodiments, the accident that can reduce judges cost, shortens accident and judges the cycle, and has embodiment party
Just, the characteristics of significant effect, promoting the use of for operation maintenance personnel is conducive to.
It is to a kind of the detailed of the ferromagnetic resonance determination methods of voltage transformer for electric power distribution network provided in an embodiment of the present invention above
Thin description, it is detailed below will to judge a kind of ferromagnetic resonance of voltage transformer for electric power distribution network provided in an embodiment of the present invention system carries out
Thin description.
Referring to Fig. 10, the ferromagnetic resonance that Figure 10 is a kind of voltage transformer for electric power distribution network provided in an embodiment of the present invention judges
The structure diagram of system.
A kind of ferromagnetic resonance of voltage transformer for electric power distribution network provided in an embodiment of the present invention judges that system includes：
First establishes module 201, is not connect for the parameter according to voltage transformer and the neutral point for accessing voltage transformer
The parameter of ground distribution network systems, establishes the mathematical model of Ferroresonance Overvoltage Caused by PT and the equivalence of isolated neutral distribution network systems
Circuit model；
Second establishes module 202, for according to mathematical model and Type Equivalent Circuit Model, passing through unified magnetic equivalent circuit UMEC
Modeling method establishes the simulation model of Ferroresonance Overvoltage Caused by PT；
3rd establishes module 203, the operating parameter of isolated neutral distribution network systems during for being occurred according to accident,
Failure setting model is established in simulation model；
Analog module 204, for setting the operating parameter in simulation model, and carries out dry run and obtains simulation model
Operation characteristic parameter, operation characteristic parameter include busbar voltage, the secondary voltage of voltage transformer；
Judgment module 205, for judging whether simulation model occurs ferromagnetic resonance according to operation characteristic parameter.
Preferably, judgment module includes：
Judging unit, if the amplitude for busbar voltage exceedes 1.1 times of normal value and the trend of low-frequency oscillation is presented, and
Secondary voltage is greater than or equal to 30V, then judges that ferromagnetic resonance occurs for simulation model, it is ferromagnetic otherwise to judge that simulation model does not occur
Resonance.
Alternatively, the 3rd establish module and specifically include：
Unit is established, the operating parameter of lighting location and isolated neutral distribution network systems when being occurred according to accident,
Failure setting model is established in simulation model, failure setting model includes singlephase earth fault disappearance module, closes unloaded busbar mould
Block and system loading acute variation analog module.
Alternatively, analog module includes：
Parameter acquiring unit, for obtaining the parameter value of currently running isolated neutral distribution network systems, and according to ginseng
The structural parameters of system equivalent source parameter, direct-to-ground capacitance, capacitive coupling, voltage transformer in setting value simulation model and
Excitation property parameter；
System equivalent source parameter includes system power source voltage and system impedance, and the structural parameters of voltage transformer include volume
Determine apparent energy, winding connection mode and rated voltage virtual value.
Wherein, the direct-to-ground capacitance set in simulation model can specifically include：
System capacitive current is measured by capacitor plug-in voltage transformer, obtains system capacitive current measurement
Value, and direct-to-ground capacitance is obtained according to the mathematical relationship of system capacitive current measured value and system capacitive current and direct-to-ground capacitance,
And using direct-to-ground capacitance as the direct-to-ground capacitance setting value in simulation model.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, may be referred to the corresponding process in preceding method embodiment, details are not described herein.
In several embodiments provided herein, it should be understood that disclosed system, apparatus and method can be with
Realize by another way.For example, device embodiment described above is only schematical, for example, the unit
Division, is only a kind of division of logic function, can there is other dividing mode, such as multiple units or component when actually realizing
Another system can be combined or be desirably integrated into, or some features can be ignored, or do not perform.It is another, it is shown or
The mutual coupling, direct-coupling or communication connection discussed can be the indirect coupling by some interfaces, device or unit
Close or communicate to connect, can be electrical, machinery or other forms.
The unit illustrated as separating component may or may not be physically separate, be shown as unit
The component shown may or may not be physical location, you can with positioned at a place, or can also be distributed to multiple
In network unit.Some or all of unit therein can be selected to realize the mesh of this embodiment scheme according to the actual needs
's.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, can also
That unit is individually physically present, can also two or more units integrate in a unit.Above-mentioned integrated list
Member can both be realized in the form of hardware, can also be realized in the form of SFU software functional unit.
If the integrated unit is realized in the form of SFU software functional unit and is used as independent production marketing or use
When, it can be stored in a computer read/write memory medium.Based on such understanding, technical scheme is substantially
The part to contribute in other words to the prior art or all or part of the technical solution can be in the form of software products
Embody, which is stored in a storage medium, including some instructions are used so that a computer
Equipment (can be personal computer, server, or network equipment etc.) performs the complete of each embodiment the method for the present invention
Portion or part steps.And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only storage (ROM, Read-Only
Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD etc. are various can store journey
The medium of sequence code.
The above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to before
Embodiment is stated the present invention is described in detail, it will be understood by those of ordinary skill in the art that：It still can be to preceding
State the technical solution described in each embodiment to modify, or equivalent substitution is carried out to which part technical characteristic；And these
Modification is replaced, and the essence of appropriate technical solution is departed from the spirit and scope of various embodiments of the present invention technical solution.
Claims (10)
- A kind of 1. ferromagnetic resonance determination methods of voltage transformer for electric power distribution network, it is characterised in that including：According to the parameter of voltage transformer and the parameter of the isolated neutral distribution network systems of the access voltage transformer, establish The mathematical model of Ferroresonance Overvoltage Caused by PT and the Type Equivalent Circuit Model of isolated neutral distribution network systems；According to the mathematical model and the Type Equivalent Circuit Model, by described in unified magnetic equivalent circuit UMEC modeling methods foundation The simulation model of Ferroresonance Overvoltage Caused by PT；The operating parameter of isolated neutral distribution network systems when being occurred according to accident, in the simulation model establishing failure sets Cover half type；The operating parameter in the simulation model is set, and carries out the operation characteristic ginseng that dry run obtains the simulation model Number, the operation characteristic parameter include busbar voltage, the secondary voltage of the voltage transformer；Judge whether the simulation model occurs ferromagnetic resonance according to the operation characteristic parameter.
- 2. the ferromagnetic resonance determination methods of voltage transformer for electric power distribution network according to claim 1, it is characterised in that described Judge whether the simulation model occurs ferromagnetic resonance and specifically include according to the operation characteristic parameter：If the amplitude of the busbar voltage exceedes 1.1 times of normal value and the trend of low-frequency oscillation, and the secondary voltage is presented More than or equal to 30V, then judge that ferromagnetic resonance occurs for the simulation model, it is ferromagnetic otherwise to judge that the simulation model does not occur Resonance.
- 3. the ferromagnetic resonance determination methods of voltage transformer for electric power distribution network according to claim 1, it is characterised in that the number Learning model is specially：<mrow> <mn>3</mn> <msub> <mi>C</mi> <mn>0</mn> </msub> <mfrac> <mrow> <msub> <mi>du</mi> <mn>0</mn> </msub> </mrow> <mrow> <mi>d</mi> <mi>t</mi> </mrow> </mfrac> <mo>+</mo> <munderover> <mo>&Sigma;</mo> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> <mn>3</mn> </munderover> <mi>f</mi> <mrow> <mo>(</mo> <msub> <mi>&phi;</mi> <mi>n</mi> </msub> <mo>)</mo> </mrow> <mo>+</mo> <mfrac> <mrow> <mn>9</mn> <msub> <mi>u</mi> <mn>0</mn> </msub> </mrow> <mi>R</mi> </mfrac> <mo>=</mo> <mn>0</mn> <mo>;</mo> </mrow>Wherein, C0For busbar direct-to-ground capacitance, u0For electromagnetic transformer secondary voltage, f (φn) encouraging for electromagnetic transformer primary side Magnetic characteristic, R are the resistance of electromagnetic transformer；The Type Equivalent Circuit Model is specially：<mrow> <msub> <mi>E</mi> <mn>0</mn> </msub> <mo>=</mo> <mfrac> <mrow> <mfrac> <msub> <mi>E</mi> <mn>1</mn> </msub> <mrow> <msub> <mi>&omega;L</mi> <mn>1</mn> </msub> </mrow> </mfrac> <mo>+</mo> <mfrac> <msub> <mi>E</mi> <mn>2</mn> </msub> <mrow> <msub> <mi>&omega;L</mi> <mn>2</mn> </msub> </mrow> </mfrac> <mo>+</mo> <mfrac> <msub> <mi>E</mi> <mn>3</mn> </msub> <mrow> <msub> <mi>&omega;L</mi> <mn>3</mn> </msub> </mrow> </mfrac> </mrow> <mrow> <mn>3</mn> <msub> <mi>&omega;C</mi> <mn>0</mn> </msub> <mo>-</mo> <mrow> <mo>(</mo> <mfrac> <mn>1</mn> <mrow> <msub> <mi>&omega;L</mi> <mn>1</mn> </msub> </mrow> </mfrac> <mo>+</mo> <mfrac> <mn>2</mn> <mrow> <msub> <mi>&omega;L</mi> <mn>2</mn> </msub> </mrow> </mfrac> <mo>+</mo> <mfrac> <mn>3</mn> <mrow> <msub> <mi>&omega;L</mi> <mn>3</mn> </msub> </mrow> </mfrac> <mo>)</mo> </mrow> </mrow> </mfrac> <mo>;</mo> </mrow>Wherein, E1、E2、E3Respectively system power source voltage, L1、L2、L3Respectively voltage transformer magnetizing inductance, E0For neutral point Displacement voltage, ω are constant.
- 4. the ferromagnetic resonance determination methods of voltage transformer for electric power distribution network according to claim 1, it is characterised in that described The operating parameter of isolated neutral distribution network systems when occurring according to accident, establishes failure setting model in the simulation model Specifically include：The operating parameter of lighting location and isolated neutral distribution network systems when being occurred according to accident, in the simulation model Failure setting model is established, the failure setting model includes singlephase earth fault disappearance module, closes unloaded busbar modules and be System load acute variation analog module.
- 5. the ferromagnetic resonance determination methods of voltage transformer for electric power distribution network according to claim 1, it is characterised in that described to set Operating parameter in the fixed simulation model includes：The parameter value of currently running isolated neutral distribution network systems is obtained, and the simulation mould is set according to the parameter value System equivalent source parameter, direct-to-ground capacitance, capacitive coupling, the structural parameters of voltage transformer and excitation property parameter in type；The system equivalent source parameter includes system power source voltage and system impedance, the structural parameters bag of the voltage transformer Include specified apparent energy, winding connection mode and rated voltage virtual value.
- 6. the ferromagnetic resonance determination methods of voltage transformer for electric power distribution network according to claim 5, it is characterised in that setting institute The direct-to-ground capacitance stated in simulation model specifically includes：System capacitive current is measured by capacitor plug-in voltage transformer, obtains system capacitive current measured value, and Direct-to-ground capacitance is obtained according to the system capacitive current measured value and the mathematical relationship of system capacitive current and direct-to-ground capacitance, and Using the direct-to-ground capacitance as the direct-to-ground capacitance setting value in the simulation model.
- 7. a kind of ferromagnetic resonance of voltage transformer for electric power distribution network judges system, it is characterised in that including：First establishes module, and the isolated neutral for the parameter according to voltage transformer and the access voltage transformer is matched somebody with somebody The parameter of net system, establishes the mathematical model of Ferroresonance Overvoltage Caused by PT and the equivalent circuit of isolated neutral distribution network systems Model；Second establishes module, for according to the mathematical model and the Type Equivalent Circuit Model, passing through unified magnetic equivalent circuit UMEC modeling methods establish the simulation model of the Ferroresonance Overvoltage Caused by PT；3rd establishes module, the operating parameter of isolated neutral distribution network systems during for being occurred according to accident, in the mould Failure setting model is established in analog model；Analog module, for setting the operating parameter in the simulation model, and carries out dry run and obtains the simulation mould The operation characteristic parameter of type, the operation characteristic parameter include busbar voltage, the secondary voltage of the voltage transformer；Judgment module, for judging whether the simulation model occurs ferromagnetic resonance according to the operation characteristic parameter.
- 8. the ferromagnetic resonance of voltage transformer for electric power distribution network according to claim 7 judges system, it is characterised in that described to sentence Disconnected module includes：Judging unit, if the amplitude for the busbar voltage exceedes 1.1 times of normal value and the trend of low-frequency oscillation is presented, and The secondary voltage is greater than or equal to 30V, then judges that ferromagnetic resonance occurs for the simulation model, otherwise judge the simulation model Ferromagnetic resonance does not occur.
- 9. the ferromagnetic resonance of voltage transformer for electric power distribution network according to claim 7 judges system, it is characterised in that described Three, which establish module, specifically includes：Unit is established, the operating parameter of lighting location and isolated neutral distribution network systems when occurring according to accident, described Failure setting model is established in simulation model, the failure setting model includes singlephase earth fault disappearance module, closes unloaded mother Wire module and system loading acute variation analog module.
- 10. the ferromagnetic resonance of voltage transformer for electric power distribution network according to claim 7 judges system, it is characterised in that described Analog module includes：Parameter acquiring unit, for obtaining the parameter value of currently running isolated neutral distribution network systems, and according to the ginseng System equivalent source parameter, direct-to-ground capacitance, capacitive coupling, the structure of voltage transformer ginseng in simulation model described in setting value Number and excitation property parameter；The system equivalent source parameter includes system power source voltage and system impedance, the structural parameters bag of the voltage transformer Include specified apparent energy, winding connection mode and rated voltage virtual value.
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