CN114157160A - Converter based on three active bridges and control method thereof - Google Patents
Converter based on three active bridges and control method thereof Download PDFInfo
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- CN114157160A CN114157160A CN202111479745.7A CN202111479745A CN114157160A CN 114157160 A CN114157160 A CN 114157160A CN 202111479745 A CN202111479745 A CN 202111479745A CN 114157160 A CN114157160 A CN 114157160A
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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
-
- 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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a converter based on three active bridges and a control method thereof, and particularly comprises the following steps of adjusting phase difference between primary side output voltage and secondary side output voltage to be equal; adjusting internally shifted phase angle D of primary side input DAB topology1And phase angle D of external shift in two output ends DAB topology of secondary side2For achieving stable transmission of power. The invention increases the control quantity D1The control is more flexible, and the phase angle D can be adjusted1And an out-shifted phase angle D2The defects of large backflow power and large current stress are overcome, the current stress is reduced, the loss generated in the operation process is reduced, the reliability of devices in the topology is guaranteed, and stable power transmission is realized; meanwhile, the backflow power generated in the power transmission process is reduced, and the overall efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of topology and control of a multi-port DC-DC converter, and particularly belongs to a converter based on three active bridges and a control method thereof
Background
In the background of the current resource shortage problem and the environmental deterioration problem, the dc power distribution system is receiving attention because it can better acquire and absorb the distributable power source. Among them, the dc power conversion technology has become a hot spot in the industry. Multi-port DC-DC converters integrated from multiple DC ports of different voltage classes are widely studied due to their higher power density and more flexible port energy management. The most studied of these are three-port converters.
The three-port converter is classified into a non-isolated type, a partially isolated type and a fully isolated type according to whether electrical isolation exists. The isolated three-port transformer can enlarge the voltage regulation range of the ports of the converter by designing the voltage ratio of the transformer. The most typical isolated three-port converter topology is a full-bridge three-port isolated bidirectional DC-DC converter (also called a three-active-bridge converter).
The three-active-bridge converter adjusts the flow direction and magnitude of energy by controlling the phase shift angle of the three port voltages, the most common control being phase shift control. However, the three-active-bridge converter under the phase-shift control has large power circulation and seriously affects the efficiency.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a converter based on three active bridges and a control method thereof, which can realize energy transmission from an MVDC (medium voltage direct current) side to an LVDC (low voltage direct current) side, increase the control quantity, simultaneously improve the control flexibility, simultaneously reduce the current stress, reduce the loss generated in the operation process, ensure the reliability of devices in the topology, realize stable power transmission, reduce the reflux power generated in the power transmission process and improve the overall efficiency.
In order to achieve the purpose, the invention provides the following technical scheme: a control method of a converter based on a three-active bridge comprises the following steps,
s1, adjusting the phase difference between the primary side output voltage and the secondary side output voltage to be equal;
s2 adjusting phase shift angle D of DAB topology at primary side input end1And phase angle D of external shift in two output ends DAB topology of secondary side2For achieving stable transmission of power.
Further, in step S2, in the primary-side input DAB topology, there is an internal phase shift angle D between the driving signals of the two interleaved switches1And two phase angles D1Are equal.
Further, in step S2, in the secondary-side two-output-end DAB topology, an outward phase shift angle D exists between each of the two output sides and the input side2And two out-shifted phase angles D2Are equal.
Further, in step S2, an internal phase shift angle D is introduced by the primary side1The primary side generates a three-level voltage.
Further, in step S2, when the return power is reduced, the phase angle D is shifted outward2At a constant value, increasing the phase shift angle D1The numerical value of (c).
The invention also provides a converter based on three active bridges, which is controlled by applying the control method and comprises a primary side and a secondary side which are connected through a high-frequency transformer, wherein the primary side comprises an input end, and the input end is in a DAB topology and is used for connecting a high-voltage input end; the secondary side is of a double H-bridge structure and comprises two output ends, the two output end structures are of a DAB topology, and the two output ends are connected in parallel and used for being connected with a low-voltage output end.
Further, the AC/DC full bridge circuit of the input end passes through an inductor L1And the connection with the primary side winding of the high-frequency transformer.
Furthermore, the two output end circuits are both connected with resistors.
Further, the switching devices adopted in the converter are all IGBTs.
Further, the high-frequency transformer is a high-frequency isolation transformer.
Compared with the prior art, the invention has at least the following beneficial effects:
compared with the traditional phase shift control, the control method based on the three-active-bridge converter increases the phase shift angle D in the control quantity1The control is more flexible, and the phase angle D can be adjusted1And an out-shifted phase angle D2The defects of large backflow power and large current stress are overcome, the current stress is reduced, the loss generated in the operation process is reduced, the reliability of devices in the topology is guaranteed, and stable power transmission is realized; meanwhile, the backflow power generated in the power transmission process is reduced, and the overall efficiency is improved.
The input end and the output end of the three-active-bridge converter are both in an H-bridge structure; in the control scheme provided by the invention, the DAB topology memory of the input port has an inner phase shift angle D1Out-shifted phase angle D between two output ports and input port2Equality by controlling the phase shift angle D1And phase angle D2And stable power transmission is realized. At the same time taking different phase angles D1Out-shifted phase angle D2And by combination, the backflow power can be reduced as much as possible under the condition of equal transmission power, and the overall transmission efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art are briefly introduced below; it is obvious that the drawings in the following description are some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic diagram of a three-active-bridge converter topology according to an embodiment of the present invention;
FIG. 2 is a waveform diagram of a control method based on a three-active-bridge converter according to an embodiment of the present invention;
FIG. 3 is a phase angle D of power characteristic of three active bridge converters with internal shift under control of three active bridge converters in accordance with an embodiment of the present invention1And an out-shifted phase angle D2Schematic illustration of a variation;
FIG. 4 shows a phase angle D of current characteristic of a three-active-bridge converter with internal shift under the control of the three-active-bridge converter according to an embodiment of the present invention1And an out-shifted phase angle D2Schematic representation of the variations.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
In order to make the purpose, technical effect and technical solution of the embodiments of the present invention clearer, the following clearly and completely describes the technical solution of the embodiments of the present invention with reference to the drawings in the embodiments of the present invention; it is to be understood that the described embodiments are only some of the embodiments of the present invention. Other embodiments, which can be derived by one of ordinary skill in the art from the disclosed embodiments without inventive faculty, are intended to be within the scope of the invention.
Referring to fig. 1, a topology structure of a three-active-bridge converter according to an embodiment of the present invention includes a primary side and a secondary side, where the primary side includes an input end, and the input end is a DAB topology for connecting a high-voltage input end; the secondary side is a double H-bridge structure and comprises two output ends, the two output end structures are DAB topologies, the two output ends are connected in parallel and used for being connected with a low-voltage output end, and the input end and the output end are connected through a high-frequency isolation transformer.
Preferably, the AC/DC full bridge circuit of the input end passes through an inductor L1And the connection with the primary side winding of the high-frequency isolation transformer.
Preferably, the two output end circuits are connected with resistors.
Preferably, the switching devices adopted in the three-port DC-DC converter topology are all IGBTs (insulated gate bipolar transistors).
The invention discloses a control method based on a three-active-bridge converter, which comprises the following specific steps of:
1. internally shifted phase angle D in primary side DAB topology1I.e. switch S1And S4And switch S2And S3All have an internal phase shift angle D1And two phase angles D shifted inwards1Equal;
2. there is no phase angle of internal shift in two output side DAB topology, and there is phase angle of external shift D between two output sides and input side2I.e. switch S5And S1And switch S9And S1All have an outward phase angle D2And two out-shifted phase angles D2Are equal.
3. Adjusting the phase difference between the primary side output voltage and the secondary side output voltage to be equal, and ensuring that no power is exchanged between the two output ports;
4. adjusting the phase angle D of the primary side voltage1And secondary side voltage phase shift angle D2For adjusting the power required for transmission, to achieve power transmission.
The invention further improves the method and also comprises the following steps: compared with the common phase shift control, the phase shift angle D is introduced into the primary side1The primary side generates a three-level voltage.
The invention further improves the method and also comprises the following steps: more flexible control, and can adjust the phase angle D1And an out-shifted phase angle D2The defects of larger reflux power and larger current stress are overcome.
As shown in figure 1 of the drawings, in which,wherein S1-S4A switch representing the primary side input port; s5-S8And S9-S12Switches respectively representing two output ports on the secondary side;
as shown in fig. 2, waveforms of the three-port DC-DC converter under the control of the three-active-bridge converter according to the present invention are schematically shown. Q1、Q2、Q3And Q4Respectively represent a primary side switch S1、S2、S3And S4Drive signal of, Q5(Q8) Represents a secondary side switch S5、S8、S9And S12Drive signal of, Q6(Q7) Represents a secondary side switch S6、S7、S10And S11The drive signal of (1). Vh1Representing a three-level voltage, V, generated on the primary sideh2Representing a square wave generated by the secondary side, wherein the voltage waveforms of the first low-voltage side and the second low-voltage side are the same. i.e. iLRepresenting the inductance L flowing through the primary side1The current of (2). p represents instantaneous power, where the area of the shadow a represents the return power generated in one cycle, and the magnitude of the transmitted power is related to the difference between the area of the shadow B and the area of the shadow a.
In the embodiment of the invention, the system simulation parameters are set in MATLAB: the input voltage is 400V, the output voltage is 200V, the loads on two buses of the topology are 200 omega, and the transformation ratio of the three-winding transformer is 1: 1: 1.
in the simulation experiment of the embodiment of the invention, the control method based on the three-active-bridge converter is adopted.
The simulation results are shown in fig. 3 and 4. FIG. 3 shows the phase angle D of the power characteristic of DAB with the inner shift under the control of a three-active-bridge converter according to the present invention1And an out-shifted phase angle D2Schematic representation of the variations. FIG. 4 shows the phase angle D of the current characteristic of DAB with the inner shift under the control of a three-active-bridge converter according to the present invention1And an out-shifted phase angle D2Schematic representation of the variations. From the analysis of FIGS. 3 and 4, when the phase angle D is shifted outwards2At a certain timing, with phase angle D shifted inwards1Increase, transient power ofThe negative part of (a) is significantly reduced, which means that the return power is reduced and the transmission efficiency is increased. Meanwhile, the peak value of the current stress is also gradually reduced, the current stress borne by the switch tube is reduced, and the device in the topology is more reliable to use.
Depending on the nature of the control, there will be many control modes, such as control for reducing current stress, control for reducing return power, and various mixed regulation modes, the particular control mode being selected in combination with the purpose of the study.
In summary, in the control method based on the three-active-bridge converter according to the embodiment of the present invention, the internally shifted phase angle is introduced to the primary side to generate the three-level waveform at the primary side, so as to reduce the backflow power, and the externally shifted phase angles D between the two output ports and the input port are used to ensure that there is no power exchange between the two output ports2Remain equal. By controlling two variable phase-shifting angles D1And an out-shifted phase angle D2The stable power transmission is realized, and the phase angle D can be adjusted at a certain time of the transmission power1And an out-shifted phase angle D2Different values make the reflux power and current stress as small as possible to improve efficiency.
Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can make modifications and equivalents to the embodiments of the present invention without departing from the spirit and scope of the present invention, which is set forth in the claims of the present application.
Claims (10)
1. A control method of a converter based on a three-active bridge is characterized by comprising the following specific steps,
s1, adjusting the phase difference between the primary side output voltage and the secondary side output voltage to be equal;
s2 adjusting phase shift angle D of DAB topology at primary side input end1And phase angle D of external shift in two output ends DAB topology of secondary side2For realizingStable transmission of power.
2. The method of claim 1, wherein in step S2, there is an internal phase shift angle D between the driving signals of the two interleaved sets of switches in the primary-side input DAB topology1And two phase angles D1Are equal.
3. The method of claim 1, wherein in step S2, there is an out-phase angle D between each of the two output sides and the input side in a secondary-side two-output DAB topology2And two out-shifted phase angles D2Are equal.
4. The method of claim 1, wherein in step S2, the phase shift angle D is introduced into the primary side1The primary side generates a three-level voltage.
5. The method of claim 1, wherein in step S2, the step of reducing the power of the backward flow is performed by shifting the phase angle D2At a constant value, increasing the phase shift angle D1The numerical value of (c).
6. A converter based on three active bridges, characterized in that it is controlled by the control method according to any of claims 1-5, comprising a primary side and a secondary side connected by a high frequency transformer, the primary side comprising an input for DAB topology for connection to a high voltage input; the secondary side is of a double H-bridge structure and comprises two output ends, the two output end structures are of a DAB topology, and the two output ends are connected in parallel and used for being connected with a low-voltage output end.
7. A three-active-bridge based converter according to claim 6,the AC/DC full bridge circuit of the input end passes through an inductor L1And the connection with the primary side winding of the high-frequency transformer.
8. The converter based on the three-active bridge as claimed in claim 6, wherein the two output end circuits are connected with resistors.
9. A converter based on three active bridges according to claim 6, characterized in that the switching devices employed in the converter are all IGBTs.
10. The converter based on three active bridges of claim 6, characterized in that the high frequency transformer is a high frequency isolation transformer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111479745.7A CN114157160A (en) | 2021-12-06 | 2021-12-06 | Converter based on three active bridges and control method thereof |
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| CN202111479745.7A CN114157160A (en) | 2021-12-06 | 2021-12-06 | Converter based on three active bridges and control method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115833611A (en) * | 2023-02-23 | 2023-03-21 | 浙江日风电气股份有限公司 | Three-active-bridge circuit control method, device and medium |
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| US20050180173A1 (en) * | 2004-02-18 | 2005-08-18 | Issa Batarseh | Power converter with interleaved topology |
| CN103516224A (en) * | 2013-10-09 | 2014-01-15 | 清华大学 | Mixed phase-shifting control method used for dually-active full-bridge direct current converter |
| CN108631600A (en) * | 2018-05-18 | 2018-10-09 | 合肥工业大学 | Double dual two-way interior phase-shifting control methods of active bridging parallel operation minimum reflux power |
| CN110149053A (en) * | 2019-05-22 | 2019-08-20 | 湖南大学 | The suppressing method of three port isolation DC/DC formula converter transient DCs biasing |
| CN110350797A (en) * | 2019-06-27 | 2019-10-18 | 西安交通大学 | A kind of very bipolar mesolow transformer topology and its control strategy based on TAB |
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2021
- 2021-12-06 CN CN202111479745.7A patent/CN114157160A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050180173A1 (en) * | 2004-02-18 | 2005-08-18 | Issa Batarseh | Power converter with interleaved topology |
| CN103516224A (en) * | 2013-10-09 | 2014-01-15 | 清华大学 | Mixed phase-shifting control method used for dually-active full-bridge direct current converter |
| CN108631600A (en) * | 2018-05-18 | 2018-10-09 | 合肥工业大学 | Double dual two-way interior phase-shifting control methods of active bridging parallel operation minimum reflux power |
| CN110149053A (en) * | 2019-05-22 | 2019-08-20 | 湖南大学 | The suppressing method of three port isolation DC/DC formula converter transient DCs biasing |
| CN110350797A (en) * | 2019-06-27 | 2019-10-18 | 西安交通大学 | A kind of very bipolar mesolow transformer topology and its control strategy based on TAB |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115833611A (en) * | 2023-02-23 | 2023-03-21 | 浙江日风电气股份有限公司 | Three-active-bridge circuit control method, device and medium |
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