CN113328611A - Method and device for restraining bias current of transformer for double active bridges - Google Patents

Method and device for restraining bias current of transformer for double active bridges Download PDF

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CN113328611A
CN113328611A CN202110629264.3A CN202110629264A CN113328611A CN 113328611 A CN113328611 A CN 113328611A CN 202110629264 A CN202110629264 A CN 202110629264A CN 113328611 A CN113328611 A CN 113328611A
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switch tube
bridge
angle
turn
rectifier
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CN113328611B (en
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王书征
刘京
朱海铭
季振东
葛辉
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Nanjing Institute of Technology
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion 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
    • H02M3/325—Conversion 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
    • H02M3/335—Conversion 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
    • H02M3/33569—Conversion 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
    • H02M3/33576—Conversion 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
    • H02M3/33584—Bidirectional converters

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  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Inverter Devices (AREA)

Abstract

The invention discloses a method and a device for restraining bias current of a transformer for a double-active bridge1Fourth inverse switch tube S in H inverse bridge4First rectifying switch tube S in H rectifying bridge5And a fourth rectifier switch tube S in the H rectifier bridge8The turn-off angle of the transformer is used for establishing a turn-off angle combination, and the given value of a phase shift angle of a transient period is obtained as a generated modulation wave according to the difference of the turn-off angle values in the turn-off angle combination, so that the bias current of the transformer is inhibited. The invention obtains the phase shift angle set value of the transient period as a mode for generating the modulation wave by different combinations of the switch tube turn-off angle values, thereby realizing the suppression of the direct current bias of the inductive current and the transformer bias current.

Description

Method and device for restraining bias current of transformer for double active bridges
Technical Field
The invention relates to the technical field of DC/DC bidirectional converters, in particular to a method and a device for restraining bias current of a transformer for a double-active bridge.
Background
In a new energy power generation system represented by photovoltaic power generation, a direct-current power distribution mode has the advantages of reducing power grid access cost and system loss, improving power supply quality and the like, and becomes a current research hotspot. The dc converter is one of the key components in the dc distribution network, and it needs to have characteristics of electrical isolation, easy control, high efficiency of operation, suitability for high power occasions, etc. The double-active-bridge converter is very suitable for a direct-current power distribution system due to the advantages of input and output isolation, high power density, soft switching, bidirectional power flow and the like.
The topology of the dual active bridge is shown in fig. 1, when the transmission power of the dual active bridge changes, the transient dc bias is generated by the inductive current and the bias current of the transformer. On the one hand, the dc bias increases the peak current flowing through the switching device, increases the switching loss, and shortens the service life thereof. On the other hand, the magnetic saturation of the magnetic core and even burning out of the magnetic core occur. Therefore, the suppression of the dc bias is very critical for the stable operation of the dual active bridge converter. The two ends of the double active bridges in the direct-current power distribution network can be connected with a passive power grid or an active power grid, and the requirements of various working modes provide higher requirements for direct-current bias suppression of the double active bridges.
The simplest method for suppressing the direct current bias in the prior art is to serially connect a capacitor in a primary winding and a secondary winding of a transformer, but the volume of a converter is increased, and the dynamic response of a system is slowed down.
Disclosure of Invention
The technical purpose is as follows: aiming at the defects in the prior art, the invention discloses a method and a device for restraining the bias current of a transformer for a double-active bridge.
The technical scheme is as follows: in order to achieve the technical purpose, the invention adopts the following technical scheme.
A method for suppressing the magnetic bias current of transformer in dual-active bridge features that the first inverter switch tube S in H inverter bridge is used1Fourth inverse switch tube S in H inverse bridge4First rectifying switch tube S in H rectifying bridge5And a fourth rectifier switch tube S in the H rectifier bridge8The turn-off angle of the transformer is used for establishing a turn-off angle combination, and the given value of a phase shift angle of a transient period is obtained as a generated modulation wave according to the difference of the turn-off angle values in the turn-off angle combination, so that the bias current of the transformer is inhibited.
Preferably, the turn-off angle combination adopts open-loop control, and the angle relation between square wave pulses in the modulation wave is adjusted according to the turn-off angle combination, so that the bias current of the transformer is suppressed.
Preferably, the turn-off angle combination comprises a turn-off angle combination one, and the turn-off angle combination one is:
setting a first inversion switch tube S in an H inversion bridge1Fourth inverse switch tube S in H inverse bridge4First rectifying switch tube S in H rectifying bridge5And a fourth rectifier switch tube S in the H rectifier bridge8The phase shift angle is a given value of the phase shift angle of the current transient period; first inverter switch tube S in H inverter bridge1The turn-off angle of the current transient period phase shift angle is a negative value of half of a given value of the current transient period phase shift angle; taking the fourth inverse switch tube S in the H inverse bridge4The turn-off angle of the phase-shifting angle is a negative value of half of a given value of the phase-shifting angle of the previous transient period; get first rectification switch tube S in H rectifier bridge5The turn-off angle of the phase-shifting angle is half of the given value of the phase-shifting angle of the transient period of the previous period; get fourth rectification switch tube S in H rectifier bridge8The turn-off angle of the current transient period phase shift angle is half of the given value.
Preferably, the turn-off angle combination includes a turn-off angle combination two, and the turn-off angle combination two is:
setting a first inversion switch tube S in an H inversion bridge1Fourth inverse switch tube S in H inverse bridge4First rectifying switch tube S in H rectifying bridge5And a fourth rectifier switch tube S in the H rectifier bridge8The phase shift angle is a given value of the phase shift angle of the current transient period; first inverter switch tube S in H inverter bridge1Turn-off angle and fourth inverse switch tube S in H inverse bridge4The turn-off angle of the current transient period phase shift angle is a negative value which is one fourth of the sum of the transient period phase shift angle set value of the previous period and the current transient period phase shift angle set value; get first rectification switch tube S in H rectifier bridge5Is turned offFourth rectifying switch tube S in corner and H rectifying bridge8The turn-off angle of the current transient period phase shift angle is one fourth of the sum of the given value of the phase shift angle of the previous transient period and the given value of the phase shift angle of the current transient period.
A transformer bias current suppression device for a double-active bridge is used for realizing any one of the above transformer bias current suppression methods for the double-active bridge, and comprises an input side capacitor C1H inverter bridge and primary side inductor L'1High frequency transformer, secondary side inductance L2H rectifier bridge and output side capacitor C2；
The input side capacitor C1Then connecting the H inverter bridge in parallel; the H inverter bridge is connected with the primary side of the high-frequency transformer; the H rectifier bridge is connected with the secondary side of the high-frequency transformer; an output side capacitor C is connected in parallel behind the H rectifier bridge2。
Preferably, the H inverter bridge includes a first inverter switching tube S1The second inverter switch tube S2The third inverter switch tube S3And a fourth inverse switching tube S4(ii) a First inverter switch tube S1The second inverter switch tube S2Are positioned on the same bridge arm; third inverter switch tube S3And a fourth inverse switch tube S4Located on the same bridge arm, wherein the first inversion switch tube S1The third inverter switch tube S3The bridge arm is positioned on the upper bridge arm; second inverter switch tube S2And a fourth inverse switch tube S4Is positioned on the lower bridge arm; in the H inverter bridge, a first inverter switch tube S1Collector and second inverter switch tube S2Emitter and primary side inductor L'1One end of the two ends are connected; primary side inductance L'1The other end of the first and second switches is connected with the primary side of the high-frequency transformer; third inverter switch tube S3Collector and fourth inverse switching tube S4Is connected to the primary side of the high-frequency transformer.
Preferably, the H rectifier bridge comprises a first rectifying switch tube S5A second rectifying switch tube S6And the third rectifier switch tube S7And a fourth rectifying switch tube S8(ii) a First rectifier switch tube S5A second rectifying switch tube S6Are positioned on the same bridge arm; third rectifier switch tube S7And a fourth rectifying switch tube S8Located in the same bridge arm, wherein the first rectifying switch tube S5And the third rectifier switch tube S7The bridge arm is positioned on the upper bridge arm; second rectifier switch S6And a fourth rectifying switch tube S8Is positioned on the lower bridge arm; in the H rectifier bridge, the first rectifier switch tube S5Collector and second rectifying switch tube S6Emitter and secondary side inductance L2One end of the two ends are connected; secondary side inductance L2The other end of the second end is connected with the secondary side of the high-frequency transformer; third rectifier switch tube S7Collector and fourth rectifying switch tube S8The emitter of the high-frequency transformer is connected with the secondary side of the high-frequency transformer.
Has the advantages that: the invention obtains the phase shift angle set value of the transient period as the mode of generating the modulation wave by different combinations of the switch tube turn-off angle values, thereby realizing the suppression of the direct current bias of the inductive current and the transformer bias current, and simultaneously reducing the impact on the switch device and the transformer.
Drawings
FIG. 1 is a schematic circuit diagram of the present invention;
FIG. 2 is a schematic diagram of a combination of turn-off angles according to the present invention;
FIG. 3 is a schematic diagram of an operating waveform of a dual active bridge in a combined off-angle state;
FIG. 4 is a schematic view of a second turn-off angle assembly of the present invention;
FIG. 5 shows the primary side inductance L 'with transient phase shift angle control'1A current waveform diagram;
FIG. 6 is an enlarged view of a portion of the waveform of FIG. 5;
FIG. 7 is a waveform diagram of a transient bias current controlling phase shift angle according to the first embodiment;
FIG. 8 is an enlarged view of a portion of the waveform of FIG. 7;
FIG. 9 is a block diagram of a system control according to a second embodiment of the present invention;
FIG. 10 is the primary side inductance L 'of the dual active bridge when the load resistance suddenly decreases by one time under the control proposed by the present invention in the second embodiment'1A current waveform diagram;
fig. 11 is a waveform diagram of the bias current of the dual active bridge when the load resistance is suddenly decreased by one time under the control of the present invention in the second embodiment;
fig. 12 is a graph of output voltage waveforms of the dual active bridge when the load resistance is suddenly decreased by one time under the control proposed by the present invention in the second embodiment;
FIG. 13 shows the primary side inductance L 'of the dual active bridge when the load resistance suddenly increases by one time under the control proposed in the second embodiment of the present invention'1A current waveform diagram;
fig. 14 is a waveform diagram of the bias current of the dual active bridge when the load resistance is suddenly doubled under the control of the present invention in the second embodiment;
fig. 15 is a graph of output voltage waveforms of the dual active bridge when the load resistance is suddenly doubled under the control of the present invention in the second embodiment;
fig. 16 is a diagram of an equivalent circuit of the secondary side of the transformer according to the present invention.
Detailed Description
The method and the device for suppressing the bias current of the transformer for the dual-active bridge according to the present invention will be further described and explained with reference to the accompanying drawings and embodiments.
A method for suppressing the magnetic bias current of transformer in dual-active bridge features that the first inverter switch tube S in H inverter bridge is used1Fourth inverse switch tube S in H inverse bridge4First rectifying switch tube S in H rectifying bridge5And a fourth rectifier switch tube S in the H rectifier bridge8The turn-off angle of the transformer is used for establishing a turn-off angle combination, and the given value of the phase shift angle of the transient period is obtained as a generated modulation wave according to the difference of the turn-off angle values in the turn-off angle combination, so that the bias current of the transformer is inhibited, as shown in attached figures 1 and 2.
When DAB (Dual Active Bridge) is in steady state operation, the updated phase shift angle of the modulation wave at each point of the rising edge or the falling edge of the pulse is equal, such as
Figure BDA0003101588320000041
Wherein
Figure BDA0003101588320000042
The given value of the phase shift angle of the transient period,
Figure BDA0003101588320000043
the given values of the phase shift angle of the previous period and the next period are respectively. The phase shift angles between the switching signals of the H inverter bridge and the switching signals of the H rectifier bridge are all
Figure BDA0003101588320000044
θx(m)(x is 1-4, m is an integer) is H inverter bridge middle switch tube SxI.e. half the phase shift angle.
In the invention, the turn-off angle combination adopts open-loop control, and the angle relation between square wave pulses in the modulation wave is adjusted according to the turn-off angle combination, so that the bias current of the transformer is inhibited.
The turn-off angle combination comprises a turn-off angle combination one, and the turn-off angle combination one is as follows:
as shown in figure 2, a first inversion switch tube S in an H inversion bridge is set1Fourth inverse switch tube S in H inverse bridge4First rectifying switch tube S in H rectifying bridge5And a fourth rectifier switch tube S in the H rectifier bridge8The phase shift angle is a given value of the phase shift angle of the current transient period; first inverter switch tube S in H inverter bridge1The turn-off angle of the current transient period phase shift angle is a negative value of half of a given value of the current transient period phase shift angle; taking the fourth inverse switch tube S in the H inverse bridge4The turn-off angle of the phase-shifting angle is a negative value of half of a given value of the phase-shifting angle of the previous transient period; get first rectification switch tube S in H rectifier bridge5The turn-off angle of the phase-shifting angle is half of the given value of the phase-shifting angle of the transient period of the previous period; get fourth rectification switch tube S in H rectifier bridge8The turn-off angle of the current transient period phase shift angle is half of the given value, in the figure,
Figure BDA0003101588320000045
are respectively a first inversion switch tube S1And a fourth inverse switch tube S4A first rectifying switch tube S5And a fourth rectifying switch tube S8The off angle of (d). The formula is as follows:
Figure BDA0003101588320000051
wherein, thetax(m)(x is 1, 4, 5, 8, m is an integer) is the corresponding switch tube SxThe turn-off angle of (a) is,
Figure BDA0003101588320000052
a given value is set for the phase shift angle of the current transient period,
Figure BDA0003101588320000053
the phase shift angle set values of the previous period and the next period are respectively, as shown in fig. 3, fig. 3 shows the working waveform of the converter when the turn-off angle of each switching tube is the value of formula (1), and when the converter operates in a steady state, the absolute values of the modulation waves updated at each sampling point are the same.
The turn-off angle combination comprises a turn-off angle combination II:
setting a first inversion switch tube S in an H inversion bridge1Fourth inverse switch tube S in H inverse bridge4First rectifying switch tube S in H rectifying bridge5And a fourth rectifier switch tube S in the H rectifier bridge8The phase shift angle is a given value of the phase shift angle of the current transient period; first inverter switch tube S in H inverter bridge1Turn-off angle and fourth inverse switch tube S in H inverse bridge4The turn-off angle of the current transient period phase shift angle is a negative value which is one fourth of the sum of the transient period phase shift angle set value of the previous period and the current transient period phase shift angle set value; get first rectification switch tube S in H rectifier bridge5Turn-off angle and fourth rectifying switch tube S in H rectifying bridge8The turn-off angle of the current transient period phase shift angle is one fourth of the sum of the given value of the phase shift angle of the previous transient period and the given value of the phase shift angle of the current transient period.
The formula is as follows:
Figure BDA0003101588320000054
as shown in fig. 4, fig. 2 shows the operating waveform of the converter when the turn-off angle of each switching tube is expressed by formula (1).
A transformer bias current suppression device for a double-active bridge is used for realizing any one of the above transformer bias current suppression methods for the double-active bridge, and comprises an input side capacitor C1H inverter bridge and primary side inductor L'1High frequency transformer, secondary side inductance L2H rectifier bridge and output side capacitor C2；
The input side capacitor C1Then connecting the H inverter bridge in parallel; the H inverter bridge is connected with the primary side of the high-frequency transformer; the H rectifier bridge is connected with the secondary side of the high-frequency transformer; an output side capacitor C is connected in parallel behind the H rectifier bridge2。
The H inverter bridge comprises a first inverter switch tube S1The second inverter switch tube S2The third inverter switch tube S3And a fourth inverse switching tube S4(ii) a First inverter switch tube S1The second inverter switch tube S2Are positioned on the same bridge arm; third inverter switch tube S3And a fourth inverse switch tube S4Located on the same bridge arm, wherein the first inversion switch tube S1The third inverter switch tube S3The bridge arm is positioned on the upper bridge arm; second inverter switch tube S2And a fourth inverse switch tube S4Is positioned on the lower bridge arm; in the H inverter bridge, a first inverter switch tube S1Collector and second inverter switch tube S2Emitter and primary side inductor L'1One end of the two ends are connected; primary side inductance L'1The other end of the first and second switches is connected with the primary side of the high-frequency transformer; third inverter switch tube S3Collector and fourth inverse switching tube S4Is connected to the primary side of the high-frequency transformer.
The H rectifier bridge comprises a first rectifier switch tube S5A second rectifying switch tube S6And the third rectifier switch tube S7And a fourth rectifying switch tube S8(ii) a First rectifier switch tube S5A second rectifying switch tube S6Are positioned on the same bridge arm; third rectifier switch tube S7And a fourth rectifying switch tube S8Located in the same bridge arm, wherein the first rectifying switch tube S5And the third rectifier switch tube S7The bridge arm is positioned on the upper bridge arm; second rectifier switch S6And a fourth rectifying switch tube S8Is positioned on the lower bridge arm; in the H rectifier bridge, the first rectifier switch tube S5Collector and second rectifying switch tube S6Emitter and secondary side inductance L2One end of the two ends are connected; secondary side inductance L2The other end of the second end is connected with the secondary side of the high-frequency transformer; third rectifier switch tube S7Collector and fourth rectifying switch tube S8The emitter of the high-frequency transformer is connected with the secondary side of the high-frequency transformer.
The first embodiment is as follows: open loop simulation
A circuit model of a dual-active bridge converter is built in Matlab \ Simulink, wherein the circuit model is shown in attached figures 1 and 2.
During open-loop simulation verification, a direct-current voltage source with the value of 270V is connected to the output side of the secondary side, namely V2 is 270V; the set phase shift angle is changed from pi/10 to pi/3, as shown in FIGS. 5-8, and the inductive current i is shown in FIGS. 5 and 7 respectivelyLAnd a bias current i0In which the inductor current i shown in FIG. 5LUnder the control of the combination of the turn-off angles, the waveform diagram of (1) shows the bias current i shown in figure 70Under the control of the turn-off angle combination two, the direct current bias is almost not existed, and the inductive current iLAnd a bias current i0Are shown in fig. 6 and 8, respectively. When the phase shift angle changes from pi/10 to pi/3 within 2ms, the inductive current iLAnd a bias current i0The new steady state is reached after approximately 16 mus, 22 mus respectively, taking less than 25 mus half of the switching period. Inductor current i in FIG. 5LVarying with a plurality of different slopes during the transient period, the bias current i in FIG. 70The current peak value is reduced in the transient period, and the feasibility of the control method for inhibiting the current direct current bias is verified by the result of open loop simulation.
Example two: closed loop simulation
A circuit model of a dual-active bridge converter is built in Matlab \ Simulink, wherein the circuit model is shown in attached figures 1 and 2.
In a closed loop simulation experiment, the control block diagram is shown in fig. 9 and generated through voltage closed loop feedback. Sampling output voltage V2And a reference voltage V of 270V2refMaking difference, the error signal delta y is given through the output phase shift angle of the PI controller
Figure BDA0003101588320000071
A periodic modulation wave is generated and compared with a carrier wave to generate a switch driving signal.
The magnitude of the load resistance is changed at the simulation time of 5ms, fig. 10 to fig. 12 show the working waveform of the dual-active-bridge converter under control provided by the invention when the load resistance is reduced by one time, and fig. 13 to fig. 15 show the working waveform of the dual-active-bridge converter under control provided by the invention when the load resistance is increased by one time. The inductances referred to in FIGS. 10 to 15 are all primary side inductances L'1。
The proposed control principle of the invention used in fig. 10 to 12 is shown in fig. 4. Inductor current iLThe waveform is shown in fig. 10, when the load changes, the dc bias is greatly reduced to a maximum of 2.69A, and the recovery time is reduced to 50 mus. Bias current i0The waveform is shown in fig. 11, the maximum dc bias is only 0.02A, and the recovery time is reduced to 50 μ s. Fig. 12 shows the output voltage waveform, no oscillation, and small voltage droop, about 6V.
The case of doubling the load resistance in fig. 13-15 is similar to the case of doubling the load resistance in fig. 10-12, and the current dc bias and the output voltage droop and recovery time are reduced using the control proposed by the present invention.
From analysis of open-loop and closed-loop simulation results, when the transmission power of the double-active-bridge converter changes, the control method provided by the text can effectively reduce the direct current bias and the steady-state recovery time of the inductive current and the bias current of the transformer, and ensure the stable and safe operation of the converter.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.

Claims (7)

1. A method for suppressing bias current of a transformer for a double-active bridge is characterized by comprising the following steps: through a first inversion switch tube S in an H inversion bridge1Fourth inverse switch tube S in H inverse bridge4First rectifying switch tube S in H rectifying bridge5And a fourth rectifier switch tube S in the H rectifier bridge8The turn-off angle of the transformer is used for establishing a turn-off angle combination, and the given value of a phase shift angle of a transient period is obtained as a generated modulation wave according to the difference of the turn-off angle values in the turn-off angle combination, so that the bias current of the transformer is inhibited.
2. The method for suppressing the bias current of the transformer for the dual-active bridge as claimed in claim 1, wherein: the turn-off angle combination adopts open-loop control, and the angle relation between square wave pulses in the modulation wave is adjusted according to the turn-off angle combination, so that the bias current of the transformer is inhibited.
3. The method for suppressing the bias current of the transformer for the dual-active bridge as claimed in claim 1, wherein: the turn-off angle combination comprises a turn-off angle combination one, and the turn-off angle combination one is as follows:
setting a first inversion switch tube S in an H inversion bridge1Fourth inverse switch tube S in H inverse bridge1First rectifying switch tube S in H rectifying bridge5And a fourth rectifier switch tube S in the H rectifier bridge8The phase shift angle is a given value of the phase shift angle of the current transient period; first inverter switch tube S in H inverter bridge1The turn-off angle of the current transient period phase shift angle is a negative value of half of a given value of the current transient period phase shift angle; taking the fourth inverse switch tube S in the H inverse bridge4The turn-off angle of the phase-shifting angle is a negative value of half of a given value of the phase-shifting angle of the previous transient period; get first rectification switch tube S in H rectifier bridge5The turn-off angle of the phase-shifting angle is half of the given value of the phase-shifting angle of the transient period of the previous period; get fourth rectification switch tube S in H rectifier bridge8The turn-off angle of the current transient period phase shift angle is half of the given value.
4. The method for suppressing the bias current of the transformer for the dual-active bridge as claimed in claim 1, wherein: the turn-off angle combination comprises a turn-off angle combination II:
setting a first inversion switch tube S in an H inversion bridge1Fourth inverse switch tube S in H inverse bridge4First rectifying switch tube S in H rectifying bridge5And a fourth rectifier switch tube S in the H rectifier bridge8The phase shift angle is a given value of the phase shift angle of the current transient period; first inverter switch tube S in H inverter bridge1Turn-off angle and fourth inverse switch tube S in H inverse bridge4The turn-off angle of the current transient period phase shift angle is a negative value which is one fourth of the sum of the transient period phase shift angle set value of the previous period and the current transient period phase shift angle set value; get first rectification switch tube S in H rectifier bridge5Turn-off angle and fourth rectifying switch tube S in H rectifying bridge8The turn-off angle of the current transient period phase shift angle is one fourth of the sum of the given value of the phase shift angle of the previous transient period and the given value of the phase shift angle of the current transient period.
5. A transformer bias current suppression device for a dual active bridge, for implementing a transformer bias current suppression method for a dual active bridge according to any one of claims 1-4, characterized in that: comprising an input-side capacitance C1H inverter bridge and primary side inductor L'1High frequency transformer, secondary side inductance L2H rectifier bridge and output side capacitor C2；
The input side capacitor C1Then connecting the H inverter bridge in parallel; the H inverter bridge is connected with the primary side of the high-frequency transformer; the H rectifier bridge is connected with the secondary side of the high-frequency transformer; an output side capacitor C is connected in parallel behind the H rectifier bridge2。
6. The transformer bias current suppression device for a dual active bridge according to claim 5, wherein: the H inverter bridge comprises a first inverter switch tube S1The second inverter switch tube S2The third inverter switch tubeS3And a fourth inverse switching tube S4(ii) a First inverter switch tube S1The second inverter switch tube S2Are positioned on the same bridge arm; third inverter switch tube S3And a fourth inverse switch tube S4Located on the same bridge arm, wherein the first inversion switch tube S1The third inverter switch tube S3The bridge arm is positioned on the upper bridge arm; second inverter switch tube S2And a fourth inverse switch tube S4Is positioned on the lower bridge arm; in the H inverter bridge, a first inverter switch tube S1Collector and second inverter switch tube S2Emitter and primary side inductor L'1One end of the two ends are connected; primary side inductance L'1The other end of the first and second switches is connected with the primary side of the high-frequency transformer; third inverter switch tube S3Collector and fourth inverse switching tube S4Is connected to the primary side of the high-frequency transformer.
7. The transformer bias current suppression device for a dual active bridge according to claim 5, wherein: the H rectifier bridge comprises a first rectifier switch tube S5A second rectifying switch tube S6And the third rectifier switch tube S7And a fourth rectifying switch tube S8(ii) a First rectifier switch tube S5A second rectifying switch tube S6Are positioned on the same bridge arm; third rectifier switch tube S7And a fourth rectifying switch tube S8Located in the same bridge arm, wherein the first rectifying switch tube S5And the third rectifier switch tube S7The bridge arm is positioned on the upper bridge arm; second rectifier switch S6And a fourth rectifying switch tube S8Is positioned on the lower bridge arm; in the H rectifier bridge, the first rectifier switch tube S5Collector and second rectifying switch tube S6Emitter and secondary side inductance L2One end of the two ends are connected; secondary side inductance L2The other end of the second end is connected with the secondary side of the high-frequency transformer; third rectifier switch tube S7Collector and fourth rectifying switch tube S8The emitter of the high-frequency transformer is connected with the secondary side of the high-frequency transformer.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1014550A2 (en) * 1998-12-18 2000-06-28 FORFAS, (trading as PEI Technologies) An AC/DC converter
US20150021998A1 (en) * 2013-07-18 2015-01-22 Solantro Semiconductor Corp. Stabilized power generation
CN108134405A (en) * 2017-12-29 2018-06-08 特变电工新疆新能源股份有限公司 A kind of double active bridge circuit modulation strategies suitable for photovoltaic generation application
CN108880217A (en) * 2018-06-04 2018-11-23 东南大学 Double active bridge DC converter soft start control methods applied to intelligent distribution network

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1014550A2 (en) * 1998-12-18 2000-06-28 FORFAS, (trading as PEI Technologies) An AC/DC converter
US20150021998A1 (en) * 2013-07-18 2015-01-22 Solantro Semiconductor Corp. Stabilized power generation
CN108134405A (en) * 2017-12-29 2018-06-08 特变电工新疆新能源股份有限公司 A kind of double active bridge circuit modulation strategies suitable for photovoltaic generation application
CN108880217A (en) * 2018-06-04 2018-11-23 东南大学 Double active bridge DC converter soft start control methods applied to intelligent distribution network

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