CN106033932B - The transient current control method of the double active bridge DC converters of three-phase - Google Patents

The transient current control method of the double active bridge DC converters of three-phase Download PDF

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CN106033932B
CN106033932B CN201610474806.3A CN201610474806A CN106033932B CN 106033932 B CN106033932 B CN 106033932B CN 201610474806 A CN201610474806 A CN 201610474806A CN 106033932 B CN106033932 B CN 106033932B
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phase
transition
duty ratio
switch
moment
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CN106033932A (en
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王跃
李卓强
施伶
崔耀
黄珺
雷万钧
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Xi an Jiaotong University
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/22Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current
    • H02M3/33523Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current with galvanic isolation between input and output
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/22Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer

Abstract

The invention discloses a kind of transient current control methods of the double active bridge DC converters of three-phase to work as V in the case where the double active bridge DC converters of three-phase are in stable state1Side and V2The duty ratio of the three-phase bridge circuit of side two instructs D1,1And D2,1Individually or simultaneously change into D1,2And D2,2When, the method for adjusting duty ratio size in transition section by two kinds, so that Three-Phase Transformer inductive current can reach balance merely through the transition section of 1/3 switch periods or 2/3 switch periods respectively, it substantially reduces because of the amplitude of converter both sides DC current oscillation and time caused by three pole reactor current imbalance, so as to improve the dynamic property of converter.

Description

The transient current control method of the double active bridge DC converters of three-phase
Technical field:
The invention belongs to the double active bridge DC converter technical fields of three-phase, and in particular to a kind of double active bridges of three-phase The transient current control method of DC converter.
Background technology:
The double active bridge DC converters of existing three-phase are by a three-phase high frequency transformer and two three-phase bridge circuits It constitutes, topological structure is as shown in Figure 1.It is a kind of isolation type bidirectional DC converter.It has high power density, lower Switch stress and the advantages that being easily achieved Sofe Switch.In addition, compared with single-phase converter, this converter is staggered using three Structure, also reduce current ripples while improving power grade.It is suitable in, large-power occasions, be suitably applied Hybrid vehicle, electric power electric transformer and intelligent grid energy storage system etc..
For the double active bridge DC converters of three-phase, variable is controlled under lower state, changing it, three can be caused There is unbalanced phenomenon in three-phase current in phase high frequency transformer, and the DC current of converter both sides is caused to generate oscillation, and With τ=Ls/RsGradually decay for time constant.Wherein, LsFor every equivalent inductance value, R in three-phase transformersFor three phase-change pressures Per equivalent resistance value in device.During actual converter design, in order to realize the wider voltage change of two DC sides Range, per equivalent inductance value L in three-phase transformersIt needs to be designed to be larger, while electric per equivalent in three-phase transformer Resistance value RsIt then needs to be designed to be smaller to reduce line loss.Therefore, time constant often becomes bigger, so that The oscillatory extinction time of converter both sides DC current is longer.
The existing control method for improving above-mentioned phenomenon, is proposed both for traditional phase shift modulation strategy.It is this Modulation strategy is only there are one controlled quentity controlled variable, i.e. phase shifting angle in two three-phase bridges between the drive signal of respective switch devicePass through Change the size of phase shifting angle and positive and negative, so that it may with the size and Orientation of controlling transmission power.At this point, two three-phase bridge circuits Duty ratio fixes and is 0.5.Corresponding control method is one transition section of introducing when phase shifting angle changes, by right Phase shifting angle size is adjusted in the section, so that three pole reactor electric current is rapidly reached new balance in transition section. However, adding phase shift modulation plan as the duty ratio of other two control variable for the duty ratio for introducing two three-phase bridge circuits For slightly, when changing two duty ratio instructions, three pole reactor electric current equally will appear unbalanced phenomenon, so as to cause transformation The DC current of device both sides generates oscillation.
Invention content:
In order to overcome the problems of the above-mentioned prior art, the purpose of the present invention is to provide a kind of double active bridges of three-phase The transient current control method of DC converter, the control method, can when individually or simultaneously changing two duty ratio instructions Pass through and adjust duty ratio size in transition section so that Three-Phase Transformer inductive current respectively merely through 1/3 switch periods or The transition section of 2/3 switch periods can reach balance, to reduce the DC current oscillation of converter both sides.
In order to achieve the above objectives, the present invention is achieved through the following technical solutions:
The transient current control method of the double active bridge DC converters of three-phase, in the double active bridge DC converters of three-phase In the case of stable state, work as V1Side and V2The duty ratio of the three-phase bridge circuit of side two instructs D1,1And D2,1Individually or simultaneously change Become D1,2And D2,2When, pass through the method for duty ratio size in two kinds of adjusting transition sections so that Three-Phase Transformer inductive current It can reach balance merely through the transition section of 1/3 switch periods or 2/3 switch periods respectively;Wherein, three-phase bridge electricity The duty ratio on road refers in a switch periods TsThe switch function S of interior each phase armm,x(t) time that value is 1 accounts for entire switch The ratio in period, and duty ratio is respectively less than or is equal to 0.5;Under the value of switch function is the upper bridge arm switch device conductive of 1 representative Bridge arm switching device turns off, and value represents lower bridge arm switch device conductive for 0 and upper bridge arm switching device turns off, m=1 or 2, point V is not represented1Side and V2The three-phase bridge circuit of side, so duty ratio instructs D1,1、D2,1And D1,2、D2,2It is abbreviated as Dm,1、Dm,2;X= A, b, c respectively represent three phase arms.
The present invention, which further improves, to be, the transition section is the transient current control side of 1/3 switch periods Method is:
For either side three-phase bridge circuit, in steady-state operation, duty ratio is Dm,1, with a phase switch functions Sm,a(t) from 0 Using (D after becoming 1m,1TsIt it was 0 moment at the time of behind)/2, into transition section;The instruction of a phase duty ratios is changed at 0 moment Transition duty ratio Dm,1Δ, i.e., continue to make a phase switch functions S from 0 momentm,a(t) 1 state is remained, (D is continuedm,1Δ·Ts)/2 Time after become 0;It is changed to transition duty ratio D with season b phase duty ratios instructionm,2Δ, i.e., continue that b phases is made to switch letter from 0 moment Number Sb,m(t) 0 state is remained, (2-3D is continuedm,2Δ)TsBecome 1 after/6 time;In Ts/ 3 moment referred to three-phase duty ratio Order is changed to Dm,2, terminate transition section.
The present invention, which further improves, to be, the expression formula of two in transition section transition duty ratio is respectively:
Wherein,fs=1/Ts, it is switching frequency;τ=Ls/Rs, it is time constant;LsFor in three-phase transformer Per equivalent inductance value;RsFor every equivalent resistance value in three-phase transformer.
The present invention, which further improves, to be, it is generally the case that time constant and the product of switching frequency are larger so that k ≈ 1, therefore the expression formula of two transition duty ratios in transition section can be abbreviated as respectively:
The present invention, which further improves, to be, the transition section is the transient current control side of 2/3 switch periods Method is:
For either side three-phase bridge circuit, in steady-state operation, duty ratio is Dm,1, with a phase switch functions Sm,a(t) from 0 Using (D after becoming 1m,1TsIt it was 0 moment at the time of behind)/2, into transition section;By 0 moment to Ts/ 3 moment were denoted as transition region Between 1, by Ts/ 3 moment are to 2Ts/ 3 moment were denoted as transition section 2;
The instruction of three-phase duty ratio is changed to transition duty ratio D in transition section 1m,1Δ, i.e., continue to make a phases from 0 moment Switch function Sm,a(t) 1 state is remained, (D is continuedm,1Δ·TsBecome 0 after the time of)/2;B phase switch functions Sm,b(t) it protects The state for 0 is held, (2-3D is continuedm,1Δ)TsBecome 1 after/6 time;
The instruction of three-phase duty ratio is changed to transition duty ratio D in transition section 2m,2Δ, i.e., from Ts/ 3 moment continued to make b Phase switch function Sm,b(t) 1 state is remained, (D is continuedm,2Δ·TsBecome 0 after the time of)/2;C phase switch functions Sm,c(t) 0 state is remained, (2-3D is continuedm,2Δ)TsBecome 1 after/6 time;
In 2TsThe instruction of three-phase duty ratio is changed to D by/3 momentm,2, terminate transition section.
The present invention, which further improves, to be, the expression formula of the transition duty ratio in two sections of transition sections is respectively:
Wherein,fs=1/Ts, it is switching frequency;τ=Ls/Rs, it is time constant;LsFor in three-phase transformer Per equivalent inductance value;RsFor every equivalent resistance value in three-phase transformer.
The present invention, which further improves, to be, it is generally the case that time constant and the product of switching frequency are larger so that k ≈ 1, therefore the expression formula of two transition duty ratios in transition section can be abbreviated as respectively:
Compared with prior art, the present invention has technique effect beneficial below:
The present invention can be big by adjusting duty ratio in transition section when individually or simultaneously changing two duty ratio instructions It is small so that Three-Phase Transformer inductive current respectively can merely through the transition section of 1/3 switch periods or 2/3 switch periods Reach balance.
Further, the present invention is solved in two Duty ratio control amounts changed instantaneous, substantially reduce because The oscillation amplitude of converter both sides DC current and time caused by three pole reactor current imbalance, so as to improve converter Dynamic property.
Description of the drawings:
Fig. 1 is the double active bridge DC converter topological structures of three-phase;
Fig. 2 is six phase arm switch function situations of change 1 of traditional control method downconverter;
Fig. 3 is six phase arm switch function situations of change 2 of traditional control method downconverter;
Fig. 4 is traditional control method downconverter three-phase current and V2The simulation result of side DC current;
Fig. 5 is six phase arm switch letters of downconverter in a manner of the transient current control that 1/3 switch periods are transition section Number change procedure figure;
Fig. 6 is six phase arm switch letters of downconverter in a manner of the transient current control that 2/3 switch periods are transition section Number change procedure figure;
Fig. 7 is downconverter three-phase current and V in a manner of the transient current control that 1/3 switch periods are transition section2Side The simulation result of DC current;
Fig. 8 is downconverter three-phase current and V in a manner of the transient current control that 2/3 switch periods are transition section2Side The simulation result of DC current.
Specific implementation mode:
With reference to specific embodiment, the present invention is described in further detail, it is described be explanation of the invention and It is not to limit.
The topological structure of the double active bridge DC converters of three-phase is as shown in Figure 1.Where it is assumed that power is from V1Effluent to V2Side, then V1It is input side DC voltage, V2It is outlet side DC voltage.The case where considering three-phase symmetrical, La、LbAnd LcIt is respectively The three-phase leakage inductance or additional inductor of transformer, inductance value are Ls;Ra、RbAnd RcIt is three-phase line resistance respectively, inductance value is Rs;ia、ibAnd icIt is Three-Phase Transformer inductive current respectively.The no-load voltage ratio of three-phase high frequency transformer is N:1.
One group of basic parameter for setting the double active bridge DC converters of three-phase is as shown in table 1.
Table 1
In the steady-state operation of the double active bridge DC converters of three-phase, using may be implemented, inductive current virtual value is minimum Duty ratio add phase shift modulation strategy.There are three control variable under this modulation strategy:V1Side and V2The three-phase bridge circuit of side two Duty ratio be respectively D1And D2And the phase shift ratio D between the corresponding phase switch function fundamental wave of both sides three-phase bridge circuitf.Wherein Duty ratio refers in a switch periods TsThe switch function S of interior each phase armm,x(t) time that value is 1 accounts for entire switch periods Ratio.The value of switch function represents upper bridge arm switch device conductive for 1 and lower bridge arm switching device turns off, and value is under 0 representative Bridge arm switch device conductive and upper bridge arm switching device turn off.M=1 or 2, respectively represents V1Side and V2The three-phase bridge circuit of side; X=a, b, c respectively represent three phase arms.For the basic parameter in table 1, can obtain under this modulation strategy, converter Three when in stable state control variables are respectively:Duty ratio D1For 0.2598, D2It is 0.3885, phase shifting angle DfIt is 0.2006.
Assuming that at this time due to the variation of transimission power or other demands for control, two duty ratio D1And D2It needs to change, Respectively from the D under stable situation1,1=0.2598 and D2,1=0.3885, change to D1,2=0.4159 and D2,2=0.4643, it moves Compared to remaining unchanged.Under traditional control method, two duty ratios can be done directly change, it is possible that two kinds of effect feelings Condition:The first is that a rising edge nearest at the time of changing apart from duty ratio in threephase switch function starts to generate effect Fruit, as shown in Fig. 2, wherein 0 moment is at the time of changing duty ratio in respective three-phase bridge structure;Second is in threephase switch A nearest failing edge starts to tell at the time of changing apart from duty ratio in function, as shown in Figure 3.However, not By being any operative condition, the phenomenon that asymmetric three-phase current and both sides DC side current oscillation, emulation can all occur The results are shown in Figure 4.
In using the present invention when transient current control method in the transition section with 1/3 switch periods, three-phase is double Six switch function change procedure figures of active bridge DC converter are as shown in Figure 5.Two transition duties in transition section The expression formula of ratio is:
In formula,fs=1/Ts, it is switching frequency;τ=Ls/Rs, it is time constant.According to converter in table 1 Parameter can obtain τ=Ls/Rs=1.75 × 10-4,By its duty ratio whole story value generation respectively Enter formula (9) and formula (10), V can be obtained1Two transition duty ratios of side three-phase bridge are respectively D1,1Δ=0.3739 and D1,2Δ= 0.3216, V2Two transition duty ratios of side three-phase bridge are respectively D2,1Δ=0.4439 and D2,2Δ=0.4184.
For V1Side three-phase bridge, with a phase switch functions S1,a(t) from 0 become 1 after using (D1,1TsIt is 0 at the time of behind)/2 Moment, into transition section.The instruction of a phase duty ratios is changed to transition duty ratio D at 0 moment1,1Δ;The instruction of b phase duty ratios is changed For transition duty ratio D1,2Δ.In TsThe instruction of three-phase duty ratio is changed to D by/3 moment1,2, terminate transition section.
For V2Side three-phase bridge, with a phase switch functions S2,a(t) from 0 become 1 after using (D2,1TsIt is 0 at the time of behind)/2 Moment, into transition section.The instruction of a phase duty ratios is changed to transition duty ratio D at 0 moment2,1Δ;The instruction of b phase duty ratios is changed For transition duty ratio D2,2Δ.In TsThe instruction of three-phase duty ratio is changed to D by/3 moment2,2, terminate transition section.
Three-phase current and V2Side exports DC current ioSimulation result it is as shown in Figure 7.
In using the present invention when transient current control method in the transition section with 2/3 switch periods, three-phase is double Six switch function change procedure figures of active bridge DC converter are as shown in Figure 6.Two transition duties in transition section The expression formula of ratio is:
τ=L can be obtained according to the parameter of converter in table 1s/Rs=1.75 × 10-4, Its duty ratio whole story value is substituted into formula (11) and formula (12) respectively, V can be obtained1Two transition duty ratios of side three-phase bridge are distinguished For D1,1Δ=0.3169 and D1,2Δ=0.3687, V2Two transition duty ratios of side three-phase bridge are respectively D2,1Δ=0.4162 He D2,2Δ=0.4414.
For V1Side three-phase bridge, with a phase switch functions S1,a(t) from 0 become 1 after using (D1,1TsIt is 0 at the time of behind)/2 Moment, into transition section.By 0 moment to Ts/ 3 moment were denoted as transition section 1, by Ts/ 3 moment are to 2Ts/ 3 moment were denoted as transition Section 2.The instruction of three-phase duty ratio is changed to transition duty ratio D in transition section 11,1Δ;Three-phase is accounted in transition section 2 Sky is changed to transition duty ratio D than instruction1,2Δ.In 2TsThe instruction of three-phase duty ratio is changed to D by/3 moment1,2, terminate transition region Between.
For V2Side three-phase bridge, with a phase switch functions S2,a(t) from 0 become 1 after using (D2,1TsIt is 0 at the time of behind)/2 Moment, into transition section.The instruction of three-phase duty ratio is changed to transition duty ratio D in transition section 12,1Δ;In transition region Between the instruction of three-phase duty ratio is changed to transition duty ratio D in 22,2Δ.In 2TsThe instruction of three-phase duty ratio is changed to by/3 moment D2,2, terminate transition section.
Three-phase current and V2Side exports DC current ioSimulation result it is as shown in Figure 8.

Claims (6)

1. the transient current control method of the double active bridge DC converters of three-phase, which is characterized in that in the double active bridges of three-phase In the case that DC converter is in stable state, work as V1Side and V2The duty ratio of the three-phase bridge circuit of side two instructs D1,1And D2,1It is single Solely or change simultaneously as D1,2And D2,2When, the method by adjusting duty ratio size in transition section so that Three-Phase Transformer electricity Inducing current can reach balance merely through the transition section of 1/3 switch periods respectively;Wherein, the duty ratio of three-phase bridge circuit Refer in a switch periods TsThe switch function S of interior each phase armm,x(t) time that value is 1 accounts for the ratio of entire switch periods Example, and duty ratio is respectively less than or is equal to 0.5;The value of switch function represents upper bridge arm switch device conductive for 1 and lower bridge arm switchs Device turns off, and value represents lower bridge arm switch device conductive for 0 and upper bridge arm switching device turns off, and m=1 or 2 respectively represents V1 Side and V2The three-phase bridge circuit of side, so duty ratio instructs D1,1、D2,1And D1,2、D2,2It is abbreviated as Dm,1、Dm,2;X=a, b, c, Respectively represent three phase arms;
The transition section is that the transient current control method of 1/3 switch periods is:
For either side three-phase bridge circuit, in steady-state operation, duty ratio is Dm,1, with a phase switch functions Sm,a(t) become from 0 Using (D after 1m,1TsIt it was 0 moment at the time of behind)/2, into transition section;The instruction of a phase duty ratios is changed to transition at 0 moment Duty ratio Dm,1Δ, i.e., continue to make a phase switch functions S from 0 momentm,a(t) 1 state is remained, (D is continuedm,1Δ·Ts)/2 when Between after become 0;It is changed to transition duty ratio D with season b phase duty ratios instructionm,2Δ, i.e., continue to make b phase switch functions S from 0 momentb,m (t) 0 state is remained, (2-3D is continuedm,2Δ)TsBecome 1 after/6 time;In Ts/ 3 moment changed the instruction of three-phase duty ratio For Dm,2, terminate transition section.
2. the transient current control method of the double active bridge DC converters of three-phase according to claim 1, feature exist In the expression formula of two transition duty ratios in transition section is respectively:
Wherein,fs=1/Ts, it is switching frequency;τ=Ls/Rs, it is time constant;LsFor every phase in three-phase transformer Equivalent inductance value;RsFor every equivalent resistance value in three-phase transformer.
3. the transient current control method of the double active bridge DC converters of three-phase according to claim 2, feature exist In, it is generally the case that time constant and the product of switching frequency are larger so that k ≈ 1, therefore two transition in transition section The expression formula of duty ratio can be abbreviated as respectively:
4. the transient current control method of the double active bridge DC converters of three-phase, which is characterized in that in the double active bridges of three-phase In the case that DC converter is in stable state, work as V1Side and V2The duty ratio of the three-phase bridge circuit of side two instructs D1,1And D2,1It is single Solely or change simultaneously as D1,2And D2,2When, the method by adjusting duty ratio size in transition section so that Three-Phase Transformer electricity Inducing current can reach balance merely through the transition section of 2/3 switch periods respectively;Wherein, the duty ratio of three-phase bridge circuit Refer in a switch periods TsThe switch function S of interior each phase armm,x(t) time that value is 1 accounts for the ratio of entire switch periods Example, and duty ratio is respectively less than or is equal to 0.5;The value of switch function represents upper bridge arm switch device conductive for 1 and lower bridge arm switchs Device turns off, and value represents lower bridge arm switch device conductive for 0 and upper bridge arm switching device turns off, and m=1 or 2 respectively represents V1 Side and V2The three-phase bridge circuit of side, so duty ratio instructs D1,1、D2,1And D1,2、D2,2It is abbreviated as Dm,1、Dm,2;X=a, b, c, Respectively represent three phase arms;
The transition section is that the transient current control method of 2/3 switch periods is:
For either side three-phase bridge circuit, in steady-state operation, duty ratio is Dm,1, with a phase switch functions Sm,a(t) become from 0 Using (D after 1m,1TsIt it was 0 moment at the time of behind)/2, into transition section;By 0 moment to Ts/ 3 moment were denoted as transition section 1, By Ts/ 3 moment are to 2Ts/ 3 moment were denoted as transition section 2;
The instruction of three-phase duty ratio is changed to transition duty ratio D in transition section 1m,1Δ, i.e., continue that a phases is made to switch from 0 moment Function Sm,a(t) 1 state is remained, (D is continuedm,1Δ·TsBecome 0 after the time of)/2;B phase switch functions Sm,b(t) it remains 0 state continues (2-3Dm,1Δ)TsBecome 1 after/6 time;
The instruction of three-phase duty ratio is changed to transition duty ratio D in transition section 2m,2Δ, i.e., from Ts/ 3 moment continued that b phases is made to open Close function Sm,b(t) 1 state is remained, (D is continuedm,2Δ·TsBecome 0 after the time of)/2;C phase switch functions Sm,c(t) it keeps For 0 state, continue (2-3Dm,2Δ)TsBecome 1 after/6 time;
In 2TsThe instruction of three-phase duty ratio is changed to D by/3 momentm,2, terminate transition section.
5. the transient current control method of the double active bridge DC converters of three-phase according to claim 4, feature exist In the expression formula of the transition duty ratio in two sections of transition sections is respectively:
Wherein,fs=1/Ts, it is switching frequency;τ=Ls/Rs, it is time constant;LsFor every phase in three-phase transformer Equivalent inductance value;RsFor every equivalent resistance value in three-phase transformer.
6. the transient current control method of the double active bridge DC converters of three-phase according to claim 5, feature exist In, it is generally the case that time constant and the product of switching frequency are larger so that k ≈ 1, therefore two transition in transition section The expression formula of duty ratio can be abbreviated as respectively:
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