CN112072923A - Two-way circuit equivalent control method - Google Patents
Two-way circuit equivalent control method Download PDFInfo
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- CN112072923A CN112072923A CN202010951589.9A CN202010951589A CN112072923A CN 112072923 A CN112072923 A CN 112072923A CN 202010951589 A CN202010951589 A CN 202010951589A CN 112072923 A CN112072923 A CN 112072923A
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- switching
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- control method
- equivalent control
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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
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
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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
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
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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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Inverter Devices (AREA)
Abstract
The invention provides a bidirectional circuit equivalent control method, which ensures that the waveforms of inductive voltage and inductive current of a double-active-bridge converter are unchanged and the energy transmission characteristic of topology is unchanged by controlling a switching action strategy, but switching of a switching tube bearing main switching loss and large voltage and current stress occurs.
Description
Technical Field
The invention relates to power electronics, in particular to a bidirectional circuit equivalent control method.
Background
In energy storage switching systems, bidirectional power electronic converters are becoming more and more important, and bidirectional DC/DC converters are core components thereof. The double-active-bridge converter has the advantages of high power density, wide voltage regulation range, high efficiency, soft switching and the like, and the energy storage system has wide application range. In actual engineering, the double-active-bridge converter optimizes the objectives of the inductive current effective value, the peak value, the reflux power and the like to obtain different inductive current waveforms. In engineering, a switching time sequence mode is usually adopted to correspond to an inductive current waveform, so that the switching loss of part of switching tubes is unbalanced, and large voltage and current stress acts on part of the switching tubes, thereby increasing the failure rate of part of the switching tubes.
Disclosure of Invention
The invention provides a bidirectional circuit equivalent control method, which ensures that a switching tube bearing main switching loss and large voltage and current stress is switched on the premise of keeping the waveform of inductive voltage and inductive current of a double-active-bridge converter unchanged and the energy transmission characteristic of topology unchanged by controlling a switching action strategy.
The control method of the invention transmits energy through the switching time sequence of 8 switching tubes, wherein the switching tubesQ 1、Q 2、Q 3、Q 4The H bridge is defined as HB1, switching tubeQ 5、Q 6、Q 7、Q 8The H-bridge of composition is defined as HB 2.
The common control mode is the first mode shown in fig. 3, the equivalent control is the second mode shown in fig. 3, and the switching operation strategy is controlled to ensure that the waveforms of the inductive voltage and the inductive current of the dual-active-bridge converter are not changed, so that the switching tube on the HB1 side, which bears the main switching loss and the large voltage and current stress, is switched on the premise that the energy transmission characteristic of the topology is not changed.
(1) The switching sequence of all the switching tubes is the common control mode i.e. mode one,t 0time inductive current time switch tubeQ 4The method is opened and the device is started,t 1time switch tubeQ 1Turn off, inductor currenti LThe maximum is reached;
(2) the equivalent control mode is mode two, D2 in the controlled variable is kept equal to the value in the first mode, and D1 and D3 are kept unchanged, namely all the switch tubes work in the second mode of the switch sequence and the second modet 0Of time-of-day inductor current and first modet 0The current at the moment is the same, but the switch tubeQ 1Opening; first, theOf two modest 1Time of day inductor currenti LTo maximum and first modet 1The current at the moment is the same, but the switch tubeQ 4And (6) turning off.
All the switch tubes can be MOS tubes or IGBT tubes.
THE ADVANTAGES OF THE PRESENT INVENTION
The invention provides a bidirectional circuit equivalent control method, which ensures that a switching tube bearing main switching loss and large voltage and current stress changes on the premise of keeping the waveform of inductive voltage and inductive current of a double-active-bridge converter unchanged and the energy transmission characteristic of topology unchanged by controlling a switching action strategy. The strategy can also be used in engineering to balance the time and loss of large current and large voltage borne by the switch tube, thereby improving the reliability of the system.
Drawings
FIG. 1 is a diagram of a dual active bridge circuit topology;
FIG. 2 is an inductor current waveform according to the present invention;
fig. 3 is a timing diagram of a switching circuit according to a first aspect of the invention;
FIG. 4 is a timing diagram of a switching circuit according to a second aspect of the present invention;
fig. 5 is a timing diagram of a switching circuit according to a third aspect of the present invention.
Detailed Description
In order to implement the technical solution of the present invention and make more engineers understand the present invention, the equivalent control strategy of the bidirectional circuit will be further explained in conjunction with the detailed implementation and the control scheme.
DAB bidirectional circuit analysis
A Double Active Bridge (DAB) topology, hereinafter abbreviated DAB. The MOS transistors are named as Q1-Q8. Energy is transmitted through the switching sequence of 8 MOS tubes.
The H-bridge on the sides of the switching tubes Q1, Q2, Q3, and Q4 is defined as HB1, and the H-bridge on the sides of the switching tubes Q5, Q6, Q7, and Q8 is defined as HB 2. D1 is the phase shift angle between Q1 and Q5; d2 is the phase shift angle between Q1 and Q4; d3 is the phase shift angle between Q5 and Q8. The flow of energy was controlled by controlling D1, D2, D3. The double-active-bridge converter transmits energy through the isolation transformer and the auxiliary inductor L1, realizes electrical isolation and bidirectional flow of the energy, can be realized by controlling three phase shifting angles of the converter, has high freedom degree, and has the waveform of inductor current as shown in figure 2 for optimal control.
In the upper and lower bridge arms of the double-active bridge circuit, Q1 and Q2 are in complementary conduction, Q3 and Q4 are in complementary conduction, Q5 and Q6 are in complementary conduction, and Q7 and Q8 are in complementary conduction. The switching timing diagram shows the overall on, on and off conditions of Q1, Q4, Q5 and Q8 at different times.
Second, switch circuit and control time sequence thereof
The invention provides a bidirectional circuit equivalent control method, which ensures that a switching tube bearing main switching loss and large voltage and current stress is switched on the premise of keeping the waveform of inductive voltage and inductive current of a double-active-bridge converter unchanged and the energy transmission characteristic of topology unchanged by controlling a switching action strategy.
Scheme one
The ordinary control is the first mode shown in fig. 3, the equivalent control is the second mode shown in fig. 3, and the switching action strategy is controlled to ensure that the waveforms of the inductive voltage and the inductive current of the dual-active-bridge converter are not changed, so that the switching tube on the HB1 side, which bears the main switching loss and the large voltage and current stress, are changed on the premise that the energy transmission characteristic of the topology is not changed.
(1) The switching sequence of all the switching tubes is the common control mode i.e. mode one,t 0time inductive current time switch tubeQ 4The method is opened and the device is started,t 1time switch tubeQ 1Turn-off, inductor current ofi LTo a maximum.
(2) The equivalent control mode is mode two. D2 in the controlled variable is kept equal to the value in the first mode, D1 and D3 are kept unchanged, namely all switch tubes work in the switching sequence second mode and the second modet 0Of time-of-day inductor current and first modet 0The current at the moment is the same, but the switch tubeQ 1And (4) opening. Of the second modet 1Time of day inductor currenti LTo maximum and first modet 1The current at the moment is the same, but the switch tubeQ 4And (6) turning off.
Scheme two
The normal control is the mode 3 shown in fig. 4, the equivalent control is the mode 4 shown in fig. 4, the values of D3 are kept equal in the controlled variables, D1 and D2 are not changed, the waveforms of the inductive voltage and the inductive current of the dual-active-bridge converter are not changed by controlling the switching action strategy, and on the premise that the energy transmission characteristic of the topology is not changed, the switching tube which bears the main switching loss and the large voltage and current stress on the HB2 side is switched.
Scheme three
The normal control is the mode 5 shown in fig. 5, the equivalent control is the mode 6 shown in fig. 5, the controlled variables keep the values of D2 and D3 equal, and the value of D1 is unchanged. By controlling a switching action strategy, the switching tubes on the HB2 and HB1 sides for bearing main switching loss and large voltage and current stress are switched on the premise that the waveforms of inductive voltage and inductive current of the double-active-bridge converter are not changed and the energy transmission characteristic of the topology is not changed.
The invention is not limited to MOS tube, but also applies to other switch tubes, such as IGBT.
The above embodiments are merely exemplary illustrations of the present invention, and are not intended to limit the present invention. Further steps not described in detail belong to technical content well known to the person skilled in the art. Corresponding changes and modifications within the spirit of the invention are also within the scope of the invention.
Claims (6)
1. A bidirectional circuit equivalent control method, through controlling the switch action tactics, guarantee the double-active bridge converter inductance voltage and inductance current waveform invariable, the topological energy transmission characteristic invariable, but make the switch tube which bears the main switching loss and large voltage, current stress take place the switch; the double-active-bridge converter transmits energy through the switching time sequence of 8 switching tubesQ 1、Q 2、Q 3、Q 4The H bridge is defined as HB1, switching tubeQ 5、Q 6、Q 7、Q 8The constituent H bridge is defined asHB 2D1 is the phase shift angle between Q1 and Q5; d2 is the phase shift angle between Q1 and Q4; d3 is the phase shift angle between Q5 and Q8, the flow of energy is controlled by controlling D1, D2, D3.
2. The control method of claim 1, wherein D2 in the normal control mode remains equal to the value of D2 in the equivalent control mode, and D1 and D3 remain unchanged.
3. The control method according to claim 2, comprising:
(1) the switching sequence is the normal control mode,t 0time inductive current time switch tubeQ 4The method is opened and the device is started,t 1time switch tubeQ 1Turn off, inductor currenti LThe maximum is reached;
(2) the equivalent control mode control variable D2 is kept equal to that in the normal control mode, and D1 and D3 are kept unchanged, namely all the switching tubes work in a switching sequence equivalent control mode which is the equivalent control modet 0Of time-of-day inductor current and common control modet 0The current at the moment is the same, but the switch tubeQ 1Opening; of equivalent control modest 1Time of day inductor currenti LTo maximum and normal control modest 1The current at the moment is the same, but the switch tubeQ 4And (6) turning off.
4. The control method as claimed in claim 1, wherein D3 of the equivalent control mode is kept equal to D3 value in the normal control mode, D1 and D2 being unchanged.
5. The control method of claim 1, wherein D2, D3 in the equivalent control mode remains equal to D2, D3 values in the normal control mode, and D1 is unchanged.
6. The control method according to claim 1, wherein all the switching tubes are MOS tubes or IGBTs.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010951589.9A CN112072923B (en) | 2020-09-11 | 2020-09-11 | Two-way circuit equivalent control method |
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| CN202010951589.9A CN112072923B (en) | 2020-09-11 | 2020-09-11 | Two-way circuit equivalent control method |
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| CN112072923B CN112072923B (en) | 2022-01-25 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112260553A (en) * | 2020-12-18 | 2021-01-22 | 深圳市永联科技股份有限公司 | Control method applied to bidirectional converter |
| EP4358379A1 (en) * | 2022-10-21 | 2024-04-24 | Siemens Aktiengesellschaft | Method for operating a dual active bridge by means of an electronic computing device, computer program product, computer-readable storage medium, electronic computing device and dual active bridge |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112260553A (en) * | 2020-12-18 | 2021-01-22 | 深圳市永联科技股份有限公司 | Control method applied to bidirectional converter |
| CN112260553B (en) * | 2020-12-18 | 2022-03-11 | 深圳市永联科技股份有限公司 | Control method applied to bidirectional converter |
| EP4358379A1 (en) * | 2022-10-21 | 2024-04-24 | Siemens Aktiengesellschaft | Method for operating a dual active bridge by means of an electronic computing device, computer program product, computer-readable storage medium, electronic computing device and dual active bridge |
| WO2024083373A1 (en) * | 2022-10-21 | 2024-04-25 | Siemens Aktiengesellschaft | Method for operating a dual active bridge by means of an electronic computing device, computer programme product, computer-readable storage medium, electronic computing device, and dual active bridge |
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| CN112072923B (en) | 2022-01-25 |
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