CN113114043B - Three-phase-shift zero-reflux power optimization method for double-active full-bridge bidirectional direct-current converter - Google Patents
Three-phase-shift zero-reflux power optimization method for double-active full-bridge bidirectional direct-current converter Download PDFInfo
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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
- 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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- 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
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention provides a three-phase-shift zero-reflux power optimization method of a double-active full-bridge bidirectional direct-current converter, which is used for reducing or eliminating reflux power of the double-active full-bridge bidirectional direct-current converter in a DAB working mode, wherein a follow current mechanism enabling an inductor of a converter winding to release energy is added in the DAB working mode, and the reflux power is reduced until eliminated by controlling the time for the inductor current to release the energy; the invention can more effectively solve the problem of backflow power of the double-active full-bridge direct-current converter under low transmission power, and has important significance for effectively improving the operation efficiency of the converter, reducing the operation cost and promoting the development of a direct-current power distribution network and renewable energy sources.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a three-phase-shift zero-reflux power optimization method for a double-active full-bridge bidirectional direct-current converter.
Background
With the excessive consumption of fossil energy such as coal, petroleum, natural gas and the like in the rapid economic development process, the ecological environment pollution problem is increasingly serious, and more energy is needed, so that the contradiction between the increasingly deficient energy and the increasingly serious environment pollution is increasingly prominent. Therefore, renewable energy sources such as solar energy, wind energy, geothermal energy, tidal energy and the like gradually attract people's attention, and due to the advantages of cleanness, no pollution, abundant stored energy, renewability and the like, the development and utilization of new energy sources are paid attention to by people, and the method has a very important significance for the sustainable development of the economy of all countries in the world. However, most renewable energy sources are easily affected by factors of weather, environment and the like, have the characteristics of randomness and indirection, and need to be combined and used for various renewable energy power generation devices and energy storage devices to deal with the characteristics of randomness and indirection to stably supply power to users. Meanwhile, a direct current power distribution network becomes a research hotspot of various countries due to the advantages of large transmission capacity, small electric energy loss, high electric energy quality, low access cost of a new energy power generation system and the like, and a bidirectional direct current converter (DAB) is generally used as an interface circuit between each stage of buses of the direct current power distribution network to perform bidirectional energy transmission.
For the traditional unidirectional direct current converter, the pair is obtained by connecting the switch tube in anti-parallel on the diode and connecting the diode in anti-parallel on the switch tubeAmong the basic bidirectional dc converters, dual-active full-bridge dc converters are receiving more and more attention in power conversion applications such as dc micro-grid, medium voltage dc and high voltage dc transmission systems due to their advantages of high power handling capability, Zero Voltage Switching (ZVS) characteristics, high power density, electrical isolation, and possibility of cascade or modular configuration to achieve higher power and higher voltage designs. The circuit topology of the double-active full-bridge DC converter is shown in figure 1, the voltage of the middle point of the full-bridge on the primary side of the converter is U AB The secondary side voltage is U at the full-bridge middle point CD ，S 1 -S 8 Is a fully-controlled power switch P-MOS, D S1 -D S8 Are anti-parallel diodes of P-MOS respectively, and the turn ratio of primary and secondary windings of the transformer is n: 1. The component for transferring energy is a transformer winding series inductance L, and L can be a transformer leakage inductance or an external inductance.
For a dual-active full-bridge dc converter, commonly used control methods are pulse width modulation control and phase shift control. The pulse width modulation control has a limited voltage regulating range because the effective value of the inverted output alternating current voltage is only lower than that of the direct current input. The phase-shift control is to generate a voltage waveform with a certain phase-shift ratio by controlling the driving of the primary side H bridge and the secondary side H bridge and to control the magnitude and direction of the transmission power of the dual-active full-bridge DC converter by adjusting the phase-shift amount.
The main working waveform of the single phase shift control is shown in fig. 2, energy is transferred by using a leakage inductance or an auxiliary inductance of a transformer, and the control of transmission power is realized by controlling the relative phase shift angle of a driving signal between bridge arms in a primary side H bridge and a secondary side H bridge.
For a basic DC-DC converter, such as a Buck converter, because the circuit topology structure is simple and the switching devices are few, current can only pass through the inductor in a single direction, the inductor respectively stores and releases energy when the switching tube is switched on and off, and the current flows through the freewheeling diode when the inductor releases the energy, so that the current does not return back to the freewheeling diodeThe presence of streaming power, as shown in fig. 3 (a). When U in DAB circuit i ＞nU O At the primary side full bridge S 1 、S 4 General formula I, S 2 、S 3 Broken and secondary side full bridge S 5 、S 8 General formula I, S 6 、S 7 In the off-state, the DAB operates in Buck mode, which is similar to the basic Buck converter switch when it is turned on, from the viewpoint of circuit characteristics, and is named as "Buck mode" herein. When the Buck mode of the DAB is the same as the conduction of a switching tube of the Buck converter, the inductance is stored with energy while power is transmitted, and after the mode is finished, the switching tube on a full bridge on the primary side of the converter acts, such as S at the moment 1 、S 4 Off, S 2 、S 3 Conducting, the inductive current can not change suddenly due to the direction, then the inductive current passes through S 2 And S 3 Return current power U i I.e., DAB producing return power into the power return mode, as shown in fig. 3 (b).
The maximum active power which can be transmitted by single phase shift modulation is large, but the maximum active power is low in control flexibility due to the fact that only one control variable is provided, zero-voltage switching within a full-power range cannot be achieved, large backflow power exists, the inductive current is increased, the line loss, the switching tube loss and the magnetic element loss are correspondingly increased, and the efficiency is reduced. In order to solve the deficiency of single phase shift modulation, the scholars propose double phase shift modulation and expanded phase shift modulation, and add one more control degree of freedom on the basis of single phase shift, and the working waveforms of the double phase shift modulation and the expanded phase shift modulation are shown in fig. 4 and 5. Both of these control strategies can reach zero backflow power when the output power is large, but cannot completely eliminate backflow power when the converter delivers small active power.
Therefore, a three-phase-shift control strategy capable of more effectively solving the problem of backflow power of the double-active full-bridge direct-current converter under low transmission power is sought, and the three-phase-shift control strategy has important significance for effectively improving the operation efficiency of the converter, reducing the operation cost and promoting the development of a direct-current power distribution network and renewable energy.
Disclosure of Invention
The invention provides a three-phase-shift zero-backflow power optimization method of a double-active full-bridge bidirectional direct-current converter, which can more effectively solve the backflow power problem of the double-active full-bridge direct-current converter under low transmission power and has important significance for effectively improving the operation efficiency of the converter, reducing the operation cost and promoting the development of a direct-current power distribution network and renewable energy sources.
The invention adopts the following technical scheme.
A double-active full-bridge bidirectional direct-current converter three-phase-shift zero-reflux power optimization method is used for eliminating reflux power of a double-active full-bridge bidirectional direct-current converter in a DAB working mode, a follow current mechanism enabling inductance of a converter winding to release energy is added in the DAB working mode, and the time for releasing the energy by inductance current is controlled to reduce the reflux power until the reflux power is eliminated.
The freewheeling mechanism does not change the converter circuit parameters.
The follow current mechanism determines the instantaneous value of the inductive current according to the three phase-shift duty ratios of the converter, and controls the storage process and the release process of the inductive energy of the converter by adjusting the relationship of the three phase-shift duty ratios.
The method is that the polarities of instantaneous values of the inductance current and the full-bridge output voltage of the input side are kept the same or not reversed, and then the constraint conditions among three phase-shift duty ratios in the corresponding phase-shift duty ratio definition domain range are determined to enable the stored energy and the released energy of the inductance in a half period to be equal.
The method for controlling the storage process and the release process of the inductive energy of the converter is a three-phase-shift control strategy with zero reflux power, and the converter has three phase-shift duty ratios D under the DAB working mode 0 ，D 1 And D 2 The phase shift ratio between the primary full-bridge and the secondary full-bridge is D 0 The phase shift ratio between the primary full bridges is D 1 The phase shift ratio between the secondary side full bridges is D 2 ；
Primary side full bridge output voltage u of converter AB And secondary side full bridge output voltage u CD Are all tri-state rectangular waves, i.e. 0, + U i Or + U o ，-U i or-U o (ii) a What is needed isU is described AB And the inductor current i L The polarity remains the same or not reversed; at u AB Jump from 0 to U i Time and u AB Jump from 0 to-U i At the moment the control strategy causes the inductor current i L Is 0.
In the circuit topology of the double-active full-bridge direct current converter, the voltage of the middle point of the primary full-bridge of the converter is U AB The secondary side voltage is U at the full-bridge intermediate point CD ，S 1 -S 8 Is a fully-controlled power switch P-MOS, D S1 -D S8 Are anti-parallel diodes of P-MOS respectively, and the turn ratio of primary and secondary windings of the transformer is n: 1; the component for transferring energy is a transformer winding series inductor L, and L is a leakage inductor of the transformer or an external inductor;
u of converter AB And U CD Are all three-level square waves and U generated by phase shift of H bridge AB >U CD ；
Provided with a switch tube S 1 When the rising edge of the driving signal is 0, U AB Rising edge at time D 1 T hs The falling edge time is T hs ，U AB Has a duty ratio of (1-D) 1 )T hs ，U CD The rising edge has a time of (D) 0 +D 2 )T hs The falling edge time is (1+ D) 0 )T hs Then U is CD Has a duty ratio of (1-D) 2 )T hs (ii) a Converter in DAB mode of operation according to U AB And U CD The rising edge and the falling edge of (D) correspond to the time, one period is divided into a plurality of parts, and the quantity D is controlled 0 、D 1 、D 2 Independently of each other, by controlling D 0 、D 1 、D 2 The relation among the 3 control quantities divides the DAB mode into six working modes;
in the three-phase-shift control strategy, D is more than or equal to 0 in six working modes 1 ≤D 0 ≤1、1+D 1 ≤D 0 +D 2 The case ≦ 2 is defined as the mode of operation that would all generate power return and would not meet the requirement of zero return power.
Three modes of six working modes divided by the three-phase-shift control strategy are working modes meeting the requirement of zero reflux power;
in particular to
Zero reflux power mode 1, phase-shift duty ratio definition domain range of 0 < D 0 ≤D 1 、D 0 +D 2 ＝D 1 Rising edge U AB And U CD Jump from 0 to U at the same time i And U O ，U CD Falling edge moment is in U AB Slave U i Time of jumping to 0 and jumping from 0 to-U i Between the moments, the energy stored and released by the positive half-cycle inductor is equal in size, the positive half-cycle and the negative half-cycle of the waveform are symmetrical, and the main working waveform is as shown in fig. 7;
zero reflux power mode 2, phase-shift duty ratio definition domain range is 0 < D 1 ≤D 0 ≤1、D 0 +D 2 ＝1，U CD Rising edge and U AB Falling edge at the same time, U CD Falling edge is in U AB Jump from 0 to-U i And a slave-U i Between the time when the jump becomes 0, the energy stored and released by the positive half-cycle inductor is equal in size, the positive half-cycle and the negative half-cycle of the waveform are symmetrical, and the main working waveform is as shown in figure 8;
zero reflux power mode 3, phase-shift duty ratio definition domain range 0 < D 0 ≤D 1 、D 0 +D 2 ＝1，U CD Rising edge and U AB Falling edge at the same time, U CD Falling edge is in U AB Slave U i Jump to 0 and from 0 to-U i Between the moments, the energy stored and released by the positive half-cycle inductor is equal in size, the positive half-cycle and the negative half-cycle of the waveform are symmetrical, and the main working waveform is as shown in fig. 9.
The method for realizing zero reflux power by the three-phase-shift control strategy is in U AB When the polarity changes, the energy on the inductor is completely released, namely the working condition of the converter is that the energy storage and release of the inductor in the positive half period are equal in magnitude;
to meet this converter condition to eliminate the backflow power,
the constraint of zero backflow power mode 1 is
The constraint of zero backflow power mode 2 is
The constraint of zero backflow power mode 3 is
The invention has the advantages that: the invention provides a zero-backflow-power three-phase-shift control strategy aiming at the problem that the backflow power problem of a double-active full-bridge direct-current converter in the working process causes the reduction of the system operation efficiency, and can effectively eliminate the backflow power problem, thereby improving the operation efficiency and the operation reliability of the converter.
Drawings
The invention is described in further detail below with reference to the following figures and detailed description:
FIG. 1 is a circuit topology diagram of a dual-active full-bridge bidirectional DC converter;
FIG. 2 is a schematic diagram of a single phase shift control main working waveform;
FIG. 3 is a schematic diagram of a reflux power generation mechanism;
FIG. 4 is a schematic diagram of the main operating waveforms of the dual phase shift control;
FIG. 5 is a schematic diagram of the main working waveform of the extended phase shift control;
FIG. 6 is a schematic diagram of the main operating waveforms of the DAB converter under three-phase control;
FIG. 7, FIG. 8 and FIG. 9 are schematic diagrams of main operating waveforms of DAB3 zero reflux power modes;
fig. 10 is a comparison diagram of the operating waveforms for the three zero reflux power modes.
Detailed Description
As shown in the figure, the double-active full-bridge bidirectional direct-current converter three-phase-shift zero-reflux power optimization method is used for eliminating the reflux power of the double-active full-bridge bidirectional direct-current converter in a DAB working mode, a follow current mechanism enabling the inductor of a converter winding to release energy is added in the working mode of DAB, and the reflux power is reduced until the reflux power is eliminated by controlling the time for the inductor current to release the energy.
The freewheeling mechanism does not change the converter circuit parameters.
The follow current mechanism determines the instantaneous value of the inductive current according to the three phase-shifting duty ratios of the converter, and controls the storage process and the release process of the inductive energy of the converter by adjusting the relationship of the three phase-shifting duty ratios.
The method is characterized in that the polarities of instantaneous values of the inductance current and the input side full-bridge output voltage are kept the same or not reversed, and then the constraint conditions among three phase-shift duty ratios in the range of the corresponding phase-shift duty ratio definition domain are determined to ensure that the energy stored and released by the inductance in a half period is equal.
The method for controlling the storage process and the release process of the inductive energy of the converter is a three-phase-shift control strategy with zero reflux power, and the converter has three phase-shift duty ratios D under the DAB working mode 0 ，D 1 And D 2 The phase shift ratio between the primary full-bridge and the secondary full-bridge is D 0 The phase shift ratio between the primary full bridges is D 1 The phase shift ratio between the secondary side full bridges is D 2 ；
Primary side full bridge output voltage u of converter AB And secondary side full bridge output voltage u CD Are all tri-state square waves, i.e. 0, + U i Or + U o ，-U i or-U o (ii) a Said u is AB And the inductor current i L The polarity remains the same or not reversed; at u AB Jump from 0 to U i Time and u AB Jump from 0 to-U i At the moment the control strategy causes the inductor current i L Is 0.
In the circuit topology of the double-active full-bridge direct current converter, the voltage of the middle point of the primary full-bridge of the converter is U AB The secondary side voltage is U at the full-bridge middle point CD ，S 1 -S 8 Is a fully-controlled power switch P-MOS, D S1 -D S8 Are anti-parallel diodes of P-MOS respectively, and the turn ratio of primary and secondary windings of the transformer is n: 1; the component for transferring energy is a transformer winding series inductor L, and L is a leakage inductor of the transformer or an external inductor;
u of converter AB And U CD Are all three-level square waves generated by phase shift of H bridge and U AB >U CD ；
Provided with a switch tube S 1 When the rising edge of the driving signal is 0, U AB Rising edge at time D 1 T hs Falling edge time is T hs ，U AB Has a duty ratio of (1-D) 1 )T hs ，U CD The rising edge time is (D) 0 +D 2 )T hs The falling edge time is (1+ D) 0 )T hs Then U is CD Has a duty ratio of (1-D) 2 )T hs (ii) a Converter according to U in DAB mode of operation AB And U CD The rising edge and the falling edge of (D) correspond to the time, one period is divided into a plurality of parts, and the quantity D is controlled 0 、D 1 、D 2 Independently of one another, by control of D 0 、D 1 、D 2 The relation among the 3 control quantities divides the DAB mode into six working modes;
in the three-phase-shift control strategy, D is more than or equal to 0 in six working modes 1 ≤D 0 ≤1、1+D 1 ≤D 0 +D 2 The case ≦ 2 is defined as the mode of operation that would all generate power return and would not meet the requirement of zero return power.
Three modes of six working modes divided by the three-phase-shift control strategy are working modes meeting the requirement of zero reflux power;
in particular to
Zero reflux power mode 1, phase-shift duty ratio definition domain range of 0 < D 0 ≤D 1 、D 0 +D 2 ＝D 1 Rising edge U AB And U CD Jump from 0 to U at the same time i And U O ，U CD Falling edge moment is in U AB Slave U i Time of hopping to 0 and hopping from 0 to-U i Between the moments, the energy stored and released by the positive half-cycle inductor is equal in size, the positive half-cycle and the negative half-cycle of the waveform are symmetrical, and the main working waveform is as shown in fig. 7;
zero reflux power mode 2, phase-shift duty ratio definition domain range is 0 < D 1 ≤D 0 ≤1、D 0 +D 2 ＝1，U CD Rising edge and U AB Falling edge at the same time, U CD Falling edge is in U AB Jump from 0 to-U i And a slave-U i Between the time when the jump becomes 0, the energy stored and released by the positive half-cycle inductor is equal in size, the positive half-cycle and the negative half-cycle of the waveform are symmetrical, and the main working waveform is as shown in figure 8;
zero reflux power mode 3, phase-shift duty ratio definition domain range of 0 < D 0 ≤D 1 、D 0 +D 2 ＝1，U CD Rising edge and U AB Falling edge at the same time, U CD Falling edge is in U AB Slave U i Jump to 0 and from 0 to-U i Between the moments, the energy stored and released by the positive half-cycle inductor is equal in size, the positive half-cycle and the negative half-cycle of the waveform are symmetrical, and the main working waveform is as shown in fig. 9.
The method for realizing zero reflux power by the three-phase-shift control strategy is in U AB When the polarity changes, the energy on the inductor is completely released, namely the working condition of the converter is that the energy storage and release of the inductor in the positive half period are equal in magnitude;
to meet this converter condition to eliminate the backflow power,
the constraint of zero backflow power mode 1 is
The constraint of zero backflow power mode 2 is
The constraint of zero backflow power mode 3 is
In this example, by the above control method, when the phase shift ratio of the three zero backflow power modes of the dual-active full-bridge dc converter under the three-phase shift control can satisfy the corresponding constraint condition, the backflow power can be effectively eliminated.
Claims (4)
1. A three-phase-shift zero-reflux power optimization method of a double-active full-bridge bidirectional direct-current converter is used for eliminating reflux power of the double-active full-bridge bidirectional direct-current converter in a DAB working mode, and is characterized in that: the optimization method adds a follow current mechanism which enables the inductor of the converter winding to release energy in the working mode of DAB, and reduces the energy until the reflux power is eliminated by controlling the time for releasing the energy by the inductor current;
the follow current mechanism determines the instantaneous value of the inductive current according to the three phase-shifting duty ratios of the converter, and controls the storage process and the release process of the inductive energy of the converter by adjusting the relationship of the three phase-shifting duty ratios;
the method is that the polarities of instantaneous values of the inductance current and the full-bridge output voltage of an input side are kept the same or not reversed, and then the constraint conditions among three phase-shift duty ratios in the range of a corresponding phase-shift duty ratio definition domain are determined to ensure that the stored energy and the released energy of the inductance in a half period are equal;
the method for controlling the storage process and the release process of the inductive energy of the converter is a three-phase-shift control strategy with zero reflux power, and the converter has three phase-shift duty ratios D under a DAB working mode 0 ，D 1 And D 2 The phase shift ratio between the primary full-bridge and the secondary full-bridge is D 0 The phase shift ratio between the primary full bridges is D 1 The phase shift ratio between the secondary side full-bridges is D 2 ；
Primary side full bridge output voltage u of converter AB And secondary side full bridge output voltage u CD Are all tri-state rectangular waves, i.e. 0, + U i Or + U o ，-U i or-U o (ii) a Said u is AB And the inductor current i L The polarity remains the same or not reversed; at u AB Jump from 0 to U i Time and u AB Jump from 0 to-U i At the moment the control strategy causes the inductor current i L The instantaneous value of (a) is 0;
in the circuit topology of the double-active full-bridge direct current converter, the voltage of the middle point of the primary full-bridge of the converter is U AB The secondary side voltage is U at the full-bridge middle point CD ，S 1 -S 8 Is a fully-controlled power switch P-MOS, D S1 -D S8 Are anti-parallel diodes of P-MOS respectively, and the turn ratio of primary and secondary windings of the transformer is n: 1; the component for transferring energy is a transformer winding series inductor L, and L is a leakage inductor of the transformer or an external inductor;
u of converter AB And U CD Are all three-level square waves generated by phase shift of H bridge and U AB >U CD ；
Provided with a switch tube S 1 When the rising edge time of the waveform of the driving signal is 0 time, U is AB Rising edge at time D 1 T hs The falling edge time is T hs ，U AB Has a duty ratio of (1-D) 1 )T hs ，U CD The rising edge has a time of (D) 0 +D 2 )T hs The falling edge time is (1+ D) 0 )T hs Then U is CD Has a duty ratio of (1-D) 2 )T hs (ii) a Converter according to U in DAB mode of operation AB And U CD The rising edge and the falling edge of (D) correspond to the time, one period is divided into a plurality of parts, and the quantity D is controlled 0 、D 1 、D 2 Independently of each other, by controlling D 0 、D 1 、D 2 The relation among the 3 control quantities divides the DAB mode into six working modes;
the method for realizing zero reflux power by the three-phase-shift control strategy is in U AB The moment of polarity change makes the energy on the inductor completely released, i.e. the working condition of the converter isThe energy storage and release of the positive half-cycle inductance are equal;
to meet this converter condition to eliminate the backflow power,
the constraint of zero backflow power mode 1 is
The constraint of zero backflow power mode 2 is
The constraint of zero backflow power mode 3 is
2. The method for optimizing the three-phase-shift zero-reflux power of the dual-active full-bridge bidirectional direct-current converter according to claim 1, wherein the method comprises the following steps: the freewheeling mechanism does not change the converter circuit parameters.
3. The method for optimizing the three-phase-shift zero-reflux power of the dual-active full-bridge bidirectional direct-current converter according to claim 1, wherein the method comprises the following steps: in the three-phase-shift control strategy, D is more than or equal to 0 in six working modes 1 ≤D 0 ≤1、1+D 1 ≤D 0 +D 2 The case ≦ 2 is defined as the mode of operation that would all generate power return and would not meet the requirement of zero return power.
4. The method for optimizing the three-phase-shift zero-reflux power of the dual-active full-bridge bidirectional direct-current converter according to claim 1, wherein the method comprises the following steps: three modes of six working modes divided by the three-phase-shift control strategy are working modes meeting the requirement of zero reflux power;
in particular to
Zero reflux power mode 1, phase-shift duty ratio definition domain range of 0 < D 0 ≤D 1 、D 0 +D 2 ＝D 1 Rising edge U AB And U CD Jump from 0 to U at the same time i And U O ，U CD Falling edge moment is in U AB Slave U i Time of hopping to 0 and hopping from 0 to-U i Between the moments, the energy stored and released by the positive half-cycle inductor is equal in size, and the positive half-cycle and the negative half-cycle of the waveform are symmetrical;
zero reflux power mode 2, phase-shift duty ratio definition domain range is 0 < D 1 ≤D 0 ≤1、D 0 +D 2 ＝1，U CD Rising edge and U AB Falling edge at the same time, U CD Falling edge is in U AB Jump from 0 to-U i And a slave-U i When the jump becomes 0, the energy stored and released by the positive half-cycle inductor is equal in size, and the positive half-cycle and the negative half-cycle of the waveform are symmetrical;
zero reflux power mode 3, phase-shift duty ratio definition domain range 0 < D 0 ≤D 1 、D 0 +D 2 ＝1，U CD Rising edge and U AB Falling edge at the same time, U CD Falling edge is in U AB Slave U i Jump to 0 and from 0 to-U i Between the moments, the energy stored and released by the positive half-cycle inductor is equal in size, and the positive half-cycle and the negative half-cycle of the waveform are symmetrical.
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