CN104764964A - High-capacity high-frequency power transformer analysis method and device - Google Patents

High-capacity high-frequency power transformer analysis method and device Download PDF

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Publication number
CN104764964A
CN104764964A CN201510191205.7A CN201510191205A CN104764964A CN 104764964 A CN104764964 A CN 104764964A CN 201510191205 A CN201510191205 A CN 201510191205A CN 104764964 A CN104764964 A CN 104764964A
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winding
secondary winding
electric capacity
transformer
mechanism model
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CN104764964B (en
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刘晨
齐磊
崔翔
沈致远
魏晓光
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State Grid Zhejiang Electric Power Co Ltd
North China Electric Power University
Smart Grid Research Institute of SGCC
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State Grid Zhejiang Electric Power Co Ltd
North China Electric Power University
Smart Grid Research Institute of SGCC
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Abstract

The invention discloses a high-capacity high-frequency power transformer analysis method and device. The method comprises the steps of A, building a magnetic mechanism model, wherein the magnetic mechanism model comprises a magnetic inductor, a leakage inductor, a primary winding internal impedor, a secondary winding internal impedor, a magnetic core loss equivalent resistor and an ideal transformer; B, building a capacitance mechanism model, wherein the capacitance mechanism model comprises a primary winding self-capacitor, a secondary winding self-capacitor, a primary and secondary winding inter-capacitor, a primary winding, a magnetic core, an oil tank inter-capacitor, a secondary winding, a magnetic core and an oil tank inter-capacitor; C, connecting the magnetic mechanism model and the capacitance mechanism model in parallel through a winding terminal to be used as a comprehensive model; D, utilizing the comprehensive model for analysis on the no-load or short-circuit or load condition. According to the high-capacity high-frequency power transformer analysis method and device, the magnetic effect and the capacitance effect inside a high-capacity high-frequency power transformer can be sufficiently considered, and effective bases are provided for high-capacity high-frequency power transformer electromagnetic analysis and design.

Description

Large Copacity high frequency power transformer analytical approach and device
Technical field
The present invention relates to Power System Analysis technical field, particularly relate to the high frequency power transformer analytical technology in electric system.
Background technology
Along with the growth of the grid-connected demand of extensive offshore wind electric field and the Novel DC such as solar electrical energy generation, fuel cell source, the conception of setting up direct current network obtains extensive concern.High power D C-DC transducer containing high frequency power transformer can, realizing large-scale direct current transmission and while controlling flexibly, ensureing both sides electrical isolation, be the critical equipment of development direct current network.High frequency power transformer is the solid-state transformer that frequency of operation exceedes intermediate frequency (10kHz), be mainly used in doing in high pressure DC-DC converter to isolate or lifting/voltage reducing transformer, also have for making high-frequency switch power transformer in high frequency switch power, and for making high frequency inverter transformer in high frequency inverter and Inverter Welder.And conventional power transformer is a kind of electrical equipment of low frequency, be used to the alternating voltage of a certain numerical value (electric current) to become the equipment of the identical another kind of frequency or the different voltage (electric current) of several numerical value.
Improve the volume and weight that frequency of operation significantly can reduce high frequency power transformer.But the high frequency power transformer being applied to DC-DC converter at present is still in the laboratory study stage, transformer capacity also far cannot meet direct current network MW class application demand.Although the strategy of multiple high frequency power transformer connection in series-parallel combination can meet power requirement, lack reliability under prior art conditions.Therefore, the capacity and the electric pressure that improve separate unit high frequency power transformer are necessary.
Fig. 1 is a kind of schematic diagram of Large Copacity high frequency power transformer, and it comprises winding AB, Secondary Winding CD, magnetic core and a fuel tank, and magnetic core is connected and ground connection by fixture with fuel tank.Along with the raising of capacity and electric pressure, high frequency power transformer need adopt oil immersed type to insulate, to ensure enough dielectric strengths in MW class application.For improve high frequency power transformer power density, reduce volume of transformer further, the magnetic material that nanometer crystal alloy, non-crystaline amorphous metal etc. have low-loss density and high saturation magnetic induction in high frequency is often used as magnetic core of transformer.The FERRITE CORE conventional from low capacity high-frequency transformer is different, and the resistivity of this magnetic core only has about 100 times of copper, is therefore a kind of conductor.
Along with the raising of frequency of operation, can not ignore with the closely-related distributed capacitance of Large Copacity high frequency power transformer inner structure, and become and affect the normal operating characteristic of transformer and the principal element with two ends power electronic equipment interphase interaction.Large Copacity high voltagehigh frequency power transformer unified model can be associated between inside transformer structure and external characteristics by resistance, inductance and capacitance parameter, for Electromagnetic Desigu Method, the analysis External Characters of Transformer important in inhibiting of development Large Copacity high voltagehigh frequency power transformer.But the analytical approach of traditional conventional power transformer is not owing to considering capacity effect and no longer applicable.Prior art medium/high frequency transformer model usually for low capacity high-frequency transformer and design, only consider the capacity effect of Transformer Winding, but winding, capacity effect between magnetic core and fuel tank cannot be considered, therefore differ greatly with the actual conditions of the Large Copacity high frequency power transformer of reality.
Summary of the invention
Given this, the object of the invention is to the shortcoming overcoming prior art, a kind of effective Large Copacity high frequency power transformer analytical approach and device are provided, this Large Copacity high frequency power transformer analytical approach and device can consider magnetic mechanism under wideband situation and electric capacity mechanism simultaneously, the wideband external characteristics under concentrated expression Large Copacity high frequency power transformer different loads condition.
In order to realize this object, the technical scheme that the present invention takes is as follows.
A kind of Large Copacity high frequency power transformer analytical approach, said method comprising the steps of:
A, set up magnetic mechanism model, described magnetic mechanism model comprises the magnetizing inductance and magnetic core equivalence loss resistance, the leakage inductance being connected on Secondary Winding, the winding internal impedance being connected on a winding and Secondary Winding respectively and Secondary Winding internal impedance and an ideal transformer that are parallel to a winding;
B, set up electric capacity mechanism model, described electric capacity mechanism model comprises and is connected in parallel on a winding self-capacitance between a winding terminals, is connected in parallel on Secondary Winding self-capacitance between Secondary Winding terminal, is connected to electric capacity once and between Secondary Winding between a winding terminals and Secondary Winding terminal, is connected to a winding between winding terminals and magnetic core and magnetic core, electric capacity between fuel tank, is connected to electric capacity between Secondary Winding between Secondary Winding terminal and magnetic core and magnetic core, fuel tank;
C, by winding terminals magnetic mechanism model in parallel and electric capacity mechanism model, as unified model;
D, under unloaded, short circuit or loading condition, described unified model is utilized to analyze.
In described magnetic mechanism model,
Magnetizing inductance is determined by stationary magnetic field energy:
Wherein W mbe that a winding applies current i 1the magnetic field energy that when excitation, Secondary Winding open circuit, Large Copacity high frequency power transformer stores;
Leakage inductance is determined by leakage magnetic field energy during ampere-turn equilibrium:
W m-leakagebe that first and second winding applies current i respectively 1, i 2and when keeping ampere-turn equilibrium, the magnetic field energy that transformer stores;
A winding internal impedance Z s1=F rr 01+ j ω L 01,
Wherein, F rfor the AC resistance coefficient of wire and frequency dependence,
R 01be the direct current resistance of a winding,
L 01be the internal inductance of a winding,
Secondary Winding internal impedance Z s2=F rr 02+ j ω L 02,
Wherein R 02for the direct current resistance of Secondary Winding,
L 02for the internal inductance of Secondary Winding,
Core loss equivalent resistance R mdetermined in the modulus value of first tuning-points by transformer open-circuit impedance characteristic,
And described ideal transformer no-load voltage ratio is
Wherein k is coupling coefficient, L 1and L 2for once with Secondary Winding self-induction.
Wherein by Finite Element Method determination magnetic field energy, to obtain the numerical value of magnetizing inductance and leakage inductance.
Determine that the step of electric capacity mechanism model is:
B1, to apply with driving voltage to transformer capacitor mechanism model port, and keep other port open, determine transformer electrostatic energy in various situation;
B2, to apply with driving voltage to transformer capacitor mechanism model two ports, and keep other port open, determine transformer electrostatic energy in various situation;
B3, according to the transformer electrostatic energy in the various situations in step B1, B2, determine winding self-capacitance, Secondary Winding self-capacitance, electric capacity between electric capacity and Secondary Winding and magnetic core, fuel tank between electric capacity, a winding and magnetic core, fuel tank once and between Secondary Winding.
Wherein by the transformer electrostatic energy in the various situations in Finite Element Method determining step B1 and B2.
Especially, in step B1, determine that transformer electrostatic energy is
In step B2, determine that transformer electrostatic energy is W | k ≠ i , j u k = 0 = W ij + W i + W j ( i , j = 1,2,3,4 and i ≠ j ) ;
In step B3, determine each electric capacity according to following relation:
W 1 = 1 2 ( C 1 + C 4 + C 6 + C 7 ) u 1 2 ,
W 2 = 1 2 ( C 2 + C 4 + C 5 + C 8 ) u 2 2 ,
W 3 = 1 2 ( C 3 + C 4 + C 5 + C 6 + C 7 + C 9 ) u 3 2 ,
W 4 = 1 2 ( C 3 + C 4 + C 5 + C 6 + C 8 + C 10 ) u 4 2 ,
W 12＝-C 4u 1u 2，
W 13＝(C 4+C 6+C 7)u 1u 3，
W 14＝-(C 4+C 6)u 1u 4，
W 23＝-(C 4+C 5)u 2u 3，
W 24＝(C 4+C 5+C 8)u 2u 4，
W 34＝-(C 3+C 4+C 5+C 6)u 3u 4，
Wherein u 1, u 2, u 3and u 4be respectively the driving voltage be applied on each port;
Electric capacity C 1be a winding self-capacitance, electric capacity C 2for Secondary Winding self-capacitance;
Electric capacity C 3, C 4, C 5, C 6for electric capacity once and between Secondary Winding,
Electric capacity C 7and C 8be electric capacity between a winding and magnetic core, fuel tank,
Electric capacity C 9and C 10for electric capacity between Secondary Winding and magnetic core, fuel tank.
A kind of Large Copacity high frequency power transformer analytical equipment, described device comprises that magnetic mechanism model sets up unit, electric capacity mechanism model sets up unit, unit set up by unified model and analytic unit, wherein,
Magnetic mechanism model sets up unit for setting up magnetic mechanism model, and described magnetic mechanism model comprises the magnetizing inductance and core loss equivalent resistance, the leakage inductance being connected on Secondary Winding, the winding internal impedance being connected on a winding and Secondary Winding respectively and Secondary Winding internal impedance and an ideal transformer that are parallel to a winding;
Electric capacity mechanism model sets up unit for setting up electric capacity mechanism model, and described electric capacity mechanism model comprises and is connected in parallel on a winding self-capacitance between a winding terminals, is connected in parallel on Secondary Winding self-capacitance between Secondary Winding terminal, is connected to electric capacity once and between Secondary Winding between a winding terminals and Secondary Winding terminal, is connected to a winding between winding terminals and magnetic core and magnetic core, electric capacity between fuel tank, is connected to electric capacity between Secondary Winding between Secondary Winding terminal and magnetic core and magnetic core, fuel tank;
Unified model sets up unit for by winding terminals magnetic mechanism model in parallel and electric capacity mechanism model, as unified model;
Analytic unit is used for utilizing described unified model to analyze under zero load, short circuit or loading condition.
By adopting Large Copacity high frequency power transformer analytical approach of the present invention and device, fully reflect magnetic effect and the capacity effect of Large Copacity high voltagehigh frequency power transformer inside, good with the wideband external characteristics goodness of fit under power transformer different loads condition, for the emi analysis of high-frequency transformer and DC-DC converter and design provide effective foundation.
Accompanying drawing explanation
Fig. 1 is the structural representation of Large Copacity high frequency power transformer.
Fig. 2 is the unified model schematic diagram being applicable to Large Copacity high frequency power transformer in embodiment of the present invention.
Fig. 3 is a Large Copacity high frequency power transformer experimental prototype machine structural drawing.
Fig. 4 is the geometric model schematic diagram of Large Copacity high frequency power transformer in embodiment of the present invention.
When Fig. 5 is for utilizing that in embodiment of the present invention, a winding open fault occurs Large Copacity high frequency power transformer analytical, transformer impedance amplitude-frequency and phase-frequency characteristic schematic diagram.
When Fig. 6 is for utilizing that in embodiment of the present invention, a short circuit in winding fault occurs Large Copacity high frequency power transformer analytical, transformer impedance amplitude-frequency and phase-frequency characteristic schematic diagram.
When Fig. 7 is for utilizing Large Copacity high frequency power transformer analytical generation Secondary Winding open fault in embodiment of the present invention, transformer impedance amplitude-frequency and phase-frequency characteristic schematic diagram.
When Fig. 8 is for utilizing Large Copacity high frequency power transformer analytical generation Secondary Winding short trouble in embodiment of the present invention, transformer impedance amplitude-frequency and phase-frequency characteristic schematic diagram.
When Fig. 9 is for utilizing a Large Copacity high frequency power transformer analytical winding connecting resistance load in embodiment of the present invention, transformer impedance amplitude-frequency and phase-frequency characteristic schematic diagram.
When Figure 10 is for utilizing Large Copacity high frequency power transformer analytical Secondary Winding connecting resistance load in embodiment of the present invention, transformer impedance amplitude-frequency and phase-frequency characteristic schematic diagram.
When Figure 11 is for utilizing that in embodiment of the present invention, Large Copacity high frequency power transformer analytical winding connects inductive load, transformer impedance amplitude-frequency and phase-frequency characteristic schematic diagram.
When Figure 12 is for utilizing that in embodiment of the present invention, Large Copacity high frequency power transformer analytical Secondary Winding connects inductive load, transformer impedance amplitude-frequency and phase-frequency characteristic schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the present invention is elaborated.
The example embodiment that following discloses are detailed.But concrete structure disclosed herein and function detail are only the objects for describing example embodiment.
But should be appreciated that, the present invention is not limited to disclosed concrete example embodiment, but covers all modifications, equivalent and the alternative that fall within the scope of the disclosure.In the description to whole accompanying drawing, identical Reference numeral represents identical element.
Should be appreciated that, term "and/or" as used in this comprises one or morely relevant lists any of item and all combinations simultaneously.Should be appreciated that in addition, when parts or unit are called as " connection " or " coupling " to another parts or unit, it can be directly connected or coupled to miscellaneous part or unit, or also can there is intermediate member or unit.In addition, other words being used for describing relation between parts or unit should be understood according to identical mode (such as, " between " to " directly ", " adjacent " to " direct neighbor " etc.).
Embodiments of the present invention comprise a kind of Large Copacity high frequency power transformer analytical approach, said method comprising the steps of:
A, set up magnetic mechanism model, described magnetic mechanism model comprises the magnetizing inductance and magnetic core equivalence loss resistance, the leakage inductance being connected on Secondary Winding, the winding internal impedance being connected on a winding and Secondary Winding respectively and Secondary Winding internal impedance and an ideal transformer that are parallel to a winding;
B, set up electric capacity mechanism model, described electric capacity mechanism model comprises and is connected in parallel on a winding self-capacitance between a winding terminals, is connected in parallel on Secondary Winding self-capacitance between Secondary Winding terminal, is connected to electric capacity once and between Secondary Winding between a winding terminals and Secondary Winding terminal, is connected to a winding between winding terminals and magnetic core and magnetic core, electric capacity between fuel tank, is connected to electric capacity between Secondary Winding between Secondary Winding terminal and magnetic core and magnetic core, fuel tank;
C, by winding terminals magnetic mechanism model in parallel and electric capacity mechanism model, as unified model;
D, under unloaded, short circuit or loading condition, described unified model is utilized to analyze.
Therefore, this Large Copacity high frequency power transformer analytical approach and device can consider magnetic mechanism under high frequency situation and electric capacity mechanism simultaneously, the concentrated expression physical characteristics of Large Copacity high frequency power transformer.
Fig. 2 is the unified model schematic diagram being applicable to Large Copacity high frequency power transformer in embodiment of the present invention, as can be seen from Figure 2, the unified model of Large Copacity high frequency power transformer comprises the magnetic mechanism model and electric capacity mechanism model that are connected in parallel, therefore fully reflects magnetic effect and the capacity effect of Large Copacity high voltagehigh frequency power transformer inside.
Fig. 3 is a Large Copacity high frequency power transformer experimental prototype machine structural drawing, and Fig. 4 is the geometric model schematic diagram of Large Copacity high frequency power transformer in embodiment of the present invention.By the geometric model in the structure of Fig. 3 and Fig. 4, the concrete construction method of magnetic mechanism model and electric capacity mechanism model is below described.
In an embodiment, in described magnetic mechanism model:
Magnetizing inductance is determined by stationary magnetic field energy: inductance L mbe connected in parallel on a winding, represent the static exciter inductance of reduction to a winding;
Wherein W mbe that a winding applies current i 1the magnetic field energy that when excitation, Secondary Winding open circuit, Large Copacity high frequency power transformer stores;
Leakage inductance is determined by leakage magnetic field energy during ampere-turn equilibrium: inductance L sbe connected on Secondary Winding, represent the transformer leakage inductance of reduction to Secondary Winding;
W m-leakagebe that first and second winding applies current i respectively 1, i 2and when keeping ampere-turn equilibrium, the magnetic field energy that transformer stores;
A winding internal impedance Z s1=F rr 01+ j ω L 01,
Wherein, F rfor the AC resistance coefficient of wire and frequency dependence, can be obtained by General Analytical computing method, not be described in detail in this present invention, but those skilled in the art can obtain method for solving accurately by consulting prior art,
R 01be the direct current resistance of a winding,
L 01be the internal inductance of a winding, known for general copper conductor by putting into practice, compared with winding AC resistance, the internal reactance of winding is usually negligible;
Secondary group internal impedance Z s2=F rr 02+ j ω L 02,
Wherein, F rfor the AC resistance coefficient of wire and frequency dependence,
R 02for the direct current resistance of Secondary Winding,
L 02for the internal inductance of Secondary Winding,
Impedance Z s1and Z s2be connected on a winding and Secondary Winding respectively, represent the internal impedance of a winding and Secondary Winding consideration high frequency kelvin effect respectively;
Core loss equivalent resistance R mcan be obtained by the modulus value of measuring transformer open-circuit impedance characteristic at first tuning-points place, represent the equivalent resistance of core loss;
And described ideal transformer no-load voltage ratio is
Wherein k is coupling coefficient, L 1and L 2for once with Secondary Winding self-induction.
In general, consider that Large Copacity high voltagehigh frequency power transformer contains magnetic core, coupling coefficient k, close to 1, can think that n is transformer secondary and a umber of turn ratio.
Described magnetic field energy can be obtained by numerical method, in a specific embodiment by Finite Element Method determination magnetic field energy, to obtain the numerical value of magnetizing inductance and leakage inductance, but those skilled in that art should know, can also obtain magnetic field energy by other means, the present invention is not limited thereto.
In addition, in the specific embodiment of the invention, determine that the step of electric capacity mechanism model is:
B1, to apply with driving voltage to transformer capacitor mechanism model port, and keep other port open, determine transformer electrostatic energy in various situation like this;
B2, to apply with driving voltage to transformer capacitor mechanism model two ports, and keep other port open, determine transformer electrostatic energy in various situation like this;
B3, according to the electrostatic energy in the various situations in step B1, B2, determine winding self-capacitance, Secondary Winding self-capacitance, electric capacity between electric capacity and Secondary Winding and magnetic core, fuel tank between electric capacity, a winding and magnetic core, fuel tank once and between Secondary Winding.
The transformer electrostatic energy in above step B1 and B2 can certainly be determined, in an embodiment, in order to obtain result comparatively easily, by the transformer electrostatic energy in Finite Element Method determining step B1 and B2 by numerical method.
Specifically, determine that the method for each electric capacity is according to transformer electrostatic energy:
In step B1, determine that transformer electrostatic energy is namely apply voltage at 1-4 port respectively, and keep other port open, determine the transformer static capacity in these situations;
In step B2, determine that transformer electrostatic energy is W | k ≠ i , j u k = 0 = W ij + W i + W j ( i , j = 1,2,3,4 and i ≠ j ) ; Namely apply voltage between two at 1-4 port respectively, and keep other port open, determine the transformer static capacity in these situations;
In step B3, determine each electric capacity according to following relation:
W 1 = 1 2 ( C 1 + C 4 + C 6 + C 7 ) u 1 2 ,
W 2 = 1 2 ( C 2 + C 4 + C 5 + C 8 ) u 2 2 ,
W 3 = 1 2 ( C 3 + C 4 + C 5 + C 6 + C 7 + C 9 ) u 3 2 ,
W 4 = 1 2 ( C 3 + C 4 + C 5 + C 6 + C 8 + C 10 ) u 4 2 ,
W 12＝-C 4u 1u 2，
W 13＝(C 4+C 6+C 7)u 1u 3，
W 14＝-(C 4+C 6)u 1u 4，
W 23＝-(C 4+C 5)u 2u 3，
W 24＝(C 4+C 5+C 8)u 2u 4，
W 34＝-(C 3+C 4+C 5+C 6)u 3u 4，
Wherein u 1, u 2, u 3and u 4be respectively the driving voltage be applied to as shown in Figure 2 on each port;
Electric capacity C 1be a winding self-capacitance, electric capacity C 2for Secondary Winding self-capacitance; Electric capacity C 1be connected in parallel between winding A, B terminal, electric capacity C 2be connected in parallel between Secondary Winding C, D terminal;
Electric capacity C 3, C 4, C 5, C 6for electric capacity once and between Secondary Winding, be connected between winding A, B terminal and Secondary Winding C, D terminal;
Electric capacity C 7and C 8be electric capacity between a winding and magnetic core, fuel tank, be connected between winding B, A terminal and magnetic core;
Electric capacity C 9and C 10for electric capacity between Secondary Winding and magnetic core, fuel tank, be connected to Secondary Winding D, between C terminal and magnetic core.
In order to match with the Large Copacity high frequency power transformer analytical approach in embodiment of the present invention, the present invention also comprises a kind of Large Copacity high frequency power transformer analytical equipment, described device comprises that magnetic mechanism model sets up unit, electric capacity mechanism model sets up unit, unit set up by unified model and analytic unit, wherein
Magnetic mechanism model sets up unit for setting up magnetic mechanism model, and described magnetic mechanism model comprises the magnetizing inductance and core loss equivalent resistance, the leakage inductance being connected on Secondary Winding, the winding internal impedance being connected on a winding and Secondary Winding respectively and Secondary Winding internal impedance and an ideal transformer that are parallel to a winding;
Electric capacity mechanism model sets up unit for setting up electric capacity mechanism model, and described electric capacity mechanism model comprises and is connected in parallel on a winding self-capacitance between a winding terminals, is connected in parallel on Secondary Winding self-capacitance between Secondary Winding terminal, is connected to electric capacity once and between Secondary Winding between a winding terminals and Secondary Winding terminal, is connected to a winding between winding terminals and magnetic core and magnetic core, electric capacity between fuel tank, is connected to electric capacity between Secondary Winding between Secondary Winding terminal and magnetic core and magnetic core, fuel tank;
Unified model sets up unit for by winding terminals magnetic mechanism model in parallel and electric capacity mechanism model, as unified model;
Analytic unit is used for utilizing described unified model to analyze under zero load, short circuit or loading condition.
In order to verify technique effect of the present invention, in one more specifically embodiment, Large Copacity high frequency power transformer analytical approach of the present invention and device are verified.
Adopt Agilent 4294A electric impedance analyzer to measure the impedance operator of Large Copacity high frequency power transformer experimental prototype machine under zero load, short circuit and load (being with 125k Ω ohmic load and 40uH inductive load respectively) condition, measurement frequency range is 100Hz-1MHz.Adopt Large Copacity high frequency power transformer analytical approach of the present invention and device to analyze simultaneously.Experiment and analysis result please refer to Fig. 5 ~ Figure 12.When wherein Fig. 5 is for utilizing that in embodiment of the present invention, a winding open fault occurs Large Copacity high frequency power transformer analytical, transformer impedance amplitude-frequency and phase-frequency characteristic schematic diagram; When Fig. 6 is for utilizing that in embodiment of the present invention, a short circuit in winding fault occurs Large Copacity high frequency power transformer analytical, transformer impedance amplitude-frequency and phase-frequency characteristic schematic diagram; When Fig. 7 is for utilizing Large Copacity high frequency power transformer analytical generation Secondary Winding open fault in embodiment of the present invention, transformer impedance amplitude-frequency and phase-frequency characteristic schematic diagram; When Fig. 8 is for utilizing Large Copacity high frequency power transformer analytical generation Secondary Winding short trouble in embodiment of the present invention, transformer impedance amplitude-frequency and phase-frequency characteristic schematic diagram; When Fig. 9 is for utilizing a Large Copacity high frequency power transformer analytical winding connecting resistance load in embodiment of the present invention, transformer impedance amplitude-frequency and phase-frequency characteristic schematic diagram; When Figure 10 is for utilizing Large Copacity high frequency power transformer analytical Secondary Winding connecting resistance load in embodiment of the present invention, transformer impedance amplitude-frequency and phase-frequency characteristic schematic diagram; When Figure 11 is for utilizing that in embodiment of the present invention, Large Copacity high frequency power transformer analytical winding connects inductive load, transformer impedance amplitude-frequency and phase-frequency characteristic schematic diagram; When Figure 12 is for utilizing that in embodiment of the present invention, Large Copacity high frequency power transformer analytical Secondary Winding connects inductive load, transformer impedance amplitude-frequency and phase-frequency characteristic schematic diagram.In Fig. 5 ~ Figure 12, solid line is actual measured results, and dotted line is the result analyzed, can see from these figure, analysis result is close with actual measured results, describe Large Copacity high frequency power transformer analytical approach of the present invention all effective in the scope of 300kHz, there is higher accuracy.
It should be noted that; above-mentioned embodiment is only the present invention's preferably embodiment; can not limiting the scope of the invention be understood as, not depart under concept thereof of the present invention, all protection scope of the present invention is belonged to modification to any subtle change that the present invention does.

Claims (7)

1. a Large Copacity high frequency power transformer analytical approach, said method comprising the steps of:
A, set up magnetic mechanism model, described magnetic mechanism model comprises the magnetizing inductance and magnetic core equivalence loss resistance, the leakage inductance being connected on Secondary Winding, the winding internal impedance being connected on a winding and Secondary Winding respectively and Secondary Winding internal impedance and an ideal transformer that are parallel to a winding;
B, set up electric capacity mechanism model, described electric capacity mechanism model comprises and is connected in parallel on a winding self-capacitance between a winding terminals, is connected in parallel on Secondary Winding self-capacitance between Secondary Winding terminal, is connected to electric capacity once and between Secondary Winding between a winding terminals and Secondary Winding terminal, is connected to a winding between winding terminals and magnetic core and magnetic core, electric capacity between fuel tank, is connected to electric capacity between Secondary Winding between Secondary Winding terminal and magnetic core and magnetic core, fuel tank;
C, by winding terminals magnetic mechanism model in parallel and electric capacity mechanism model, as unified model;
D, under unloaded, short circuit or loading condition, described unified model is utilized to analyze.
2., according to the Large Copacity high frequency power transformer analytical approach described in claim 1, it is characterized in that, in described magnetic mechanism model,
Magnetizing inductance is determined by stationary magnetic field energy:
Wherein W mbe that a winding applies current i 1the magnetic field energy that when excitation, Secondary Winding open circuit, Large Copacity high frequency power transformer stores;
Leakage inductance is determined by leakage magnetic field energy during ampere-turn equilibrium:
W m-leakagebe that first and second winding applies current i respectively 1, i 2and when keeping ampere-turn equilibrium, the magnetic field energy that Large Copacity high frequency power transformer stores;
A winding internal impedance Z s1=F rr 01+ j ω L 01,
Wherein, F rfor the AC resistance coefficient of wire and frequency dependence,
R 01be the direct current resistance of a winding,
L 01be the internal inductance of a winding,
Secondary Winding internal impedance Z s2=F rr 02+ j ω L 02,
Wherein R 02for the direct current resistance of Secondary Winding,
L 02for the internal inductance of Secondary Winding,
Core loss equivalent resistance R mdetermined in the modulus value of first tuning-points by transformer open-circuit impedance characteristic,
And described ideal transformer no-load voltage ratio is
Wherein k is coupling coefficient, L 1and L 2for once with Secondary Winding self-induction.
3. according to the Large Copacity high frequency power transformer analytical approach described in claim 2, it is characterized in that, by Finite Element Method determination magnetic field energy, to obtain the numerical value of magnetizing inductance and leakage inductance.
4. according to the Large Copacity high frequency power transformer analytical approach described in claim 1, it is characterized in that, determine that the step of electric capacity mechanism model is:
B1, to apply with driving voltage to transformer capacitor mechanism model port, and keep other port open, determine transformer electrostatic energy in various situation;
B2, to apply with driving voltage to transformer capacitor mechanism model two ports, and keep other port open, determine transformer electrostatic energy in various situation;
B3, according to the transformer electrostatic energy in the various situations in step B1, B2, determine winding self-capacitance, Secondary Winding self-capacitance, electric capacity between electric capacity and Secondary Winding and magnetic core, fuel tank between electric capacity, a winding and magnetic core, fuel tank once and between Secondary Winding.
5. according to the Large Copacity high frequency power transformer analytical approach described in claim 4, it is characterized in that, by the transformer electrostatic energy in the various situations in Finite Element Method determining step B1 and B2.
6., according to the Large Copacity high frequency power transformer analytical approach described in claim 4, it is characterized in that,
In step B1, determine that transformer electrostatic energy is i=1,2,3,4;
In step B2, determine that transformer electrostatic energy is i, j=1,2,3,4, i ≠ j;
In step B3, determine each electric capacity according to following relation:
W 1 = 1 2 ( C 1 + C 4 + C 6 + C 7 ) u 1 2 ,
W 2 = 1 2 ( C 2 + C 4 + C 5 + C 8 ) u 2 2 ,
W 3 = 1 2 ( C 3 + C 4 + C 5 + C 7 + C 9 ) u 3 2 ,
W 4 = 1 2 ( C 3 + C 4 + C 5 + C 6 + C 8 + C 10 ) u 4 2 ,
W 12＝-C 4u 1u 2，
W 13＝(C 4+C 6+C 7)u 1u 3，
W 14＝-(C 4+C 6)u 1u 4，
W 23＝-(C 4+C 5)u 2u 3，
W 24＝(C 4+C 5+C 8)u 2u 4，
W 34＝-(C 3+C 4+C 5+C 6)u 3u 4，
Wherein u 1, u 2, u 3and u 4be respectively the driving voltage be applied on each port;
Electric capacity C 1be a winding self-capacitance, electric capacity C 2for Secondary Winding self-capacitance;
Electric capacity C 3, C 4, C 5, C 6for electric capacity once and between Secondary Winding,
Electric capacity C 7and C 8be electric capacity between a winding and magnetic core, fuel tank,
Electric capacity C 9and C 10for electric capacity between Secondary Winding and magnetic core, fuel tank.
7. a Large Copacity high frequency power transformer analytical equipment, described device comprises that magnetic mechanism model sets up unit, electric capacity mechanism model sets up unit, unit set up by unified model and analytic unit, wherein,
Magnetic mechanism model sets up unit for setting up magnetic mechanism model, and described magnetic mechanism model comprises the magnetizing inductance and core loss equivalent resistance, the leakage inductance being connected on Secondary Winding, the winding internal impedance being connected on a winding and Secondary Winding respectively and Secondary Winding internal impedance and an ideal transformer that are parallel to a winding;
Electric capacity mechanism model sets up unit for setting up electric capacity mechanism model, and described electric capacity mechanism model comprises and is connected in parallel on a winding self-capacitance between a winding terminals, is connected in parallel on Secondary Winding self-capacitance between Secondary Winding terminal, is connected to electric capacity once and between Secondary Winding between a winding terminals and Secondary Winding terminal, is connected to a winding between winding terminals and magnetic core and magnetic core, electric capacity between fuel tank, is connected to electric capacity between Secondary Winding between Secondary Winding terminal and magnetic core and magnetic core, fuel tank;
Unified model sets up unit for by winding terminals magnetic mechanism model in parallel and electric capacity mechanism model, as unified model;
Analytic unit is used for utilizing described unified model to analyze under zero load, short circuit or loading condition.
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