CN115603582A - High-voltage direct-current power supply and control method thereof - Google Patents
High-voltage direct-current power supply and control method thereof Download PDFInfo
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- CN115603582A CN115603582A CN202211090450.5A CN202211090450A CN115603582A CN 115603582 A CN115603582 A CN 115603582A CN 202211090450 A CN202211090450 A CN 202211090450A CN 115603582 A CN115603582 A CN 115603582A
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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
- H02M3/3353—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 at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
-
- 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
Abstract
The invention discloses a high-voltage direct current power supply and a control method thereof, wherein the high-voltage direct current power supply comprises: an LLC converter unit and a dual active bridge converter; the input ends of the LLC converter unit and the double-active bridge converter are supplied with power by adopting a direct current bus with constant voltage, the LLC converter unit comprises a plurality of LLC converters, and the output ends of the LLC converters are sequentially connected in series; the output of the LLC converter unit is connected in series with the output of the dual active bridge converter. According to the invention, the LLC converter unit and the input ends of the double-active-bridge converter are connected in parallel, the output end of the LLC converter unit is connected with the input ends of the double-active-bridge converter in series, the LLC converter is used for high-efficiency fixed-frequency output, and the switching of the LLC converter unit and the continuous regulation of the voltage of the double-active-bridge converter are utilized to realize the high-voltage wide-range high-efficiency output of the direct-current power supply.
Description
Technical Field
The invention relates to the technical field of power supplies, in particular to a high-voltage direct-current power supply and a control method thereof.
Background
The high-power high-voltage direct-current power supply is widely applied to the aspects of high-voltage direct-current power transmission, electrostatic dust removal, microwave power supply and the like, and is also applied to the fields of testing, scientific research and the like, such as device testing, controllable nuclear fusion and the like. The existing high-voltage direct-current power supply generally adopts a mode of combining a power frequency transformer with low-frequency electric energy conversion to realize high-voltage direct-current output, but the output voltage fluctuation is large, the voltage regulation range is narrow, the conventional power frequency conversion has the problems of low power density, low conversion efficiency and the like, the development of the high-voltage direct-current power supply is restricted, and the existing high-voltage direct-current power supply cannot realize high-voltage wide-range output.
Disclosure of Invention
The invention provides a high-voltage direct-current power supply and a control method thereof, which aim to solve the technical problems that the high-voltage direct-current output cannot be realized by combining a power frequency transformer with low-frequency electric energy conversion in the conventional high-voltage direct-current power supply, and the high-voltage direct-current power supply cannot realize high-voltage wide-range output.
An embodiment of the present invention provides a high voltage dc power supply, including:
a dual active bridge converter and an LLC converter unit;
the LLC converter unit comprises a plurality of LLC converters, and output ends of the LLC converters are sequentially connected in series;
the input end of the LLC converter unit is connected with the voltage input end, and the output end of the LLC converter unit is connected with the output end of the double-active bridge converter in series;
and the input ends of the double-active bridge converter and the LLC converter unit are supplied with power by adopting a constant-voltage direct-current bus.
Furthermore, a plurality of LLC converters adopt a fixed frequency and fixed duty ratio mode to realize power output.
An embodiment of the present invention provides a control method for a high voltage dc power supply, which is suitable for the high voltage dc power supply described above, and includes:
collecting a reference voltage;
when the current reference voltage is higher than the maximum voltage of the hysteresis region and the flag low is 1, judging that the reference voltage penetrates through the hysteresis region, and setting the flag low to be 0;
switching a current controller into a sliding mode controller, and increasing the duty ratio of the LLC converter unit from 0 to 0.5;
and designing the phase shift angle interval of the LLC converter unit to be 90 DEG/N, and switching the sliding mode controller to a PI controller, wherein N is the number of LLC converters in the LLC converter unit.
Further, the control method further includes:
when the current reference voltage is lower than the minimum voltage of the hysteresis zone and the flag high is 0, judging that the hysteresis zone penetrates under the reference voltage, and setting the flag high to be 1;
switching a current controller into a sliding mode controller, reducing the duty ratio of the LLC converter unit from 0.5 to 0, designing the phase shift angle interval of the LLC converter unit to be 90 degrees/(N-1), and switching the sliding mode controller into a PI controller.
Further, before collecting the reference voltage, the control method further includes:
designing an output voltage range of the dual active bridge converter.
Further, the designing the output voltage range of the dual active bridge converter includes:
and designing the output voltage range of the double-active-bridge converter according to the voltage regulating range of the double-active-bridge converter at the maximum power output.
According to the embodiment of the invention, the input end of the LLC converter unit is connected with the voltage input end, and the output end of the LLC converter unit is connected with the output end of the double-active bridge converter in series; the LLC converter outputs at a fixed frequency and a fixed duty ratio, and when the input voltage is regulated, the wide-range output of the output voltage is realized through switching of the LLC converter unit and continuous regulation of the double-active bridge converter.
Furthermore, the double-active bridge converter in the embodiment of the invention is positioned at the bottom end of the high-voltage direct-current power supply, and the negative electrode of the output power supply is grounded, so that the isolation voltage borne by the primary side and the secondary side of the double-active bridge converter is the highest working voltage of the double-active bridge converter, and the isolation voltage of a driving signal of the controller on the secondary side H bridge is the lowest.
Drawings
FIG. 1 is a schematic structural diagram of a high voltage DC power supply provided by an embodiment of the invention;
FIG. 2 is another schematic diagram of the high voltage DC power supply provided by the embodiment of the invention;
fig. 3 is a schematic flow chart of a control method of the high-voltage direct-current power supply according to an embodiment of the invention;
FIG. 4 is a voltage diagram of a switching process of a high voltage DC power supply according to an embodiment of the present invention;
fig. 5 is a schematic diagram illustrating a switching control flow of the high-voltage power supply according to an embodiment of the invention;
fig. 6 is another schematic flow chart of a switching control process of the high-voltage power supply according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, the meaning of "a plurality" is two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Referring to fig. 1, an embodiment of the invention provides a high voltage dc power supply, including:
a dual active bridge converter 10 and an LLC converter unit 20;
the LLC converter unit 20 includes a plurality of LLC converters 201, and output ends of the LLC converters 201 are connected in series in sequence;
the input end of the LLC converter unit 20 is connected to a voltage input end, and the output end of the LLC converter unit 20 is connected in series with the output end of the dual-active bridge converter 10;
the input ends of the dual-active bridge converter 10 and the LLC converter unit 20 are both supplied with a constant-voltage dc bus.
Referring to fig. 2, the dual active bridge converter 10 and the LLC converter unit 20 form a high-voltage dc power supply according to an embodiment of the present invention, i.e. a single-stage hybrid high-voltage dc power supply.
The high-voltage direct-current power supply of the embodiment of the invention is connected in an input parallel connection and output series connection mode, and the input ends of the double-active-bridge converter 10 and the LLC converter unit 20 are both supplied with power by adopting a direct-current bus with constant voltage.
A plurality of LLC converter units 20 are controlled in a staggered mode, the output of the LLC converters are connected in parallel, and each LLC converter 201 realizes power output in a fixed frequency and fixed duty ratio mode.
In the embodiment of the present invention, the input end of the LLC converter unit 20 is connected to the voltage input end, and the output end of the LLC converter unit 20 is connected in series with the output end of the dual-active bridge converter 10; the LLC converter unit controls the fixed frequency and the fixed duty ratio, and when the input voltage is regulated, the LLC converter unit 20 can switch and the voltage of the double-active bridge converter 10 can be continuously regulated, so that the wide-range output of the output voltage is realized.
Furthermore, the dual-active bridge converter 10 in the embodiment of the present invention is located at the bottom end of the high-voltage dc power supply, and the negative electrode of the output power supply is grounded, so that the isolation voltage borne by the primary side and the secondary side of the dual-active bridge converter 10 is the highest working voltage of the dual-active bridge converter 10, and the isolation voltage of the controller driving signal to the secondary side H bridge is the lowest.
The embodiment of the invention adopts a modular structure design to form the high-voltage direct-current power supply, thereby being beneficial to the flexible expansion of output voltage and power grade.
Referring to fig. 3, an embodiment of the invention provides a method for controlling a high-voltage dc power supply, which is suitable for the high-voltage dc power supply, and includes:
s1, collecting reference voltage;
in the embodiment of the present invention, the output voltage of any LLC converter 201 in the high-voltage dc power supply can be collected as the reference voltage V ref 。
In the embodiment of the present invention, if the reference voltage Vref is higher than the maximum voltage VHH of the hysteresis region, the flag FlagHigh is set to 1; if the reference voltage Vref is in the voltage interval of the hysteresis zone, continuing to acquire the reference voltage Vref; and if the reference voltage Vref is lower than the minimum voltage VHL of the hysteresis zone, setting the flag position FlagLow to 1. Fig. 4 is a schematic voltage diagram of a switching process of the high voltage dc power supply according to an embodiment of the invention.
S2, when the current reference voltage is higher than the maximum voltage of the hysteresis region and the flag Low is 1, judging that the reference voltage penetrates through the hysteresis region, and setting the flag Low to be 0;
s3, switching the current controller into a sliding mode controller, and increasing the duty ratio of the LLC converter unit 20 by 0 and by 0.5;
in an embodiment of the present invention, the controller includes a PI controller and a sliding mode controller.
And S4, designing the phase shift angle interval of the LLC converter unit 20 to be 90 DEG/N, and switching the sliding mode controller to a PI controller, wherein N is the number of LLC converters 201 in the LLC converter unit 20.
Fig. 5 is a schematic diagram of a switching control process of a high-voltage power supply according to an embodiment of the present invention; fig. 6 is another schematic flow chart of the switching control process of the high-voltage power supply according to the embodiment of the present invention. In one embodiment, embodiments of the present invention provide for the output voltage V to be collected os And dual active bridge converter 10 capacitive current i c And the output voltage and the capacitor voltage of the double-active bridge transformer are sent to a controller to realize closed-loop feedback control.
In one embodiment, the control method further comprises:
when the current reference voltage is lower than the minimum voltage of the hysteresis zone and the flag high is 0, judging that the hysteresis zone penetrates under the reference voltage, and setting the flag high to be 1;
switching the current controller to a sliding mode controller, reducing the duty ratio of the LLC converter unit 20 from 0.5 to 0, designing the phase shift angle spacing of the LLC converter unit 20 to 90 °/(N-1), and switching the sliding mode controller to a PI controller.
In one embodiment, before collecting the reference voltage, the control method further comprises:
the output voltage range of the dual active bridge converter 10 is designed.
In the embodiment of the present invention, because of the constant current output characteristic of the dual active bridge transformer, the voltage value output at the time of maximum power output is the minimum, when the output voltage range of the dual active bridge converter 10 is designed, the voltage regulation range at the time of maximum power output of the dual active small-sized converter is adopted for design, so that the full range of the output voltage of the high voltage direct current power supply can be adjusted when the dual active bridge converter 10 has a light load.
In one embodiment, the designing the output voltage range of the dual active bridge converter includes:
and designing the output voltage range of the double-active-bridge converter 10 according to the voltage regulation range of the double-active-bridge converter at the maximum power output.
The embodiment of the invention has the following beneficial effects:
when the embodiment of the invention regulates the input voltage, the switching of the LLC converter unit 20 and the continuous regulation of the dual-active bridge converter 10 can be used, so that not only can the output voltage be quickly and continuously regulated, but also a wide voltage range can be output, and in the switching process, the sliding mode controller can realize the quick and smooth response in the voltage switching process, thereby effectively improving the voltage stability of the high-voltage direct-current power supply.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (6)
1. A high voltage dc power supply, comprising:
a dual active bridge converter and an LLC converter unit;
the LLC converter unit comprises a plurality of LLC converters, and output ends of the LLC converters are sequentially connected in series;
an input end of the LLC converter unit is connected with a voltage input end, and an output end of the LLC converter unit is connected in series with an output end of the dual active bridge converter;
and the input ends of the double-active bridge converter and the LLC converter unit are supplied with power by adopting a constant-voltage direct-current bus.
2. The high voltage dc power supply of claim 1, wherein a number of said LLC converters achieve power output in a fixed frequency and fixed duty cycle manner.
3. A control method for a high voltage dc power supply, adapted to any of claims 1-2, comprising:
collecting a reference voltage;
when the current reference voltage is higher than the maximum voltage of the hysteresis region and the flag low is 1, judging that the reference voltage penetrates through the hysteresis region, and setting the flag low to be 0;
switching a current controller into a sliding mode controller, and increasing the duty ratio of the LLC converter unit from 0 to 0.5;
and designing the phase shift angle interval of the LLC converter unit to be 90 DEG/N, and switching the sliding mode controller to a PI controller, wherein N is the number of LLC converters in the LLC converter unit.
4. The hvdc control method defined in claim 3, further comprising:
when the current reference voltage is lower than the minimum voltage of the hysteresis zone and the flag high is 0, judging that the hysteresis zone penetrates under the reference voltage, and setting the flag high to be 1;
and switching the current controller into a sliding mode controller, reducing the duty ratio of the LLC converter unit from 0.5 to 0, designing the phase shift angle interval of the LLC converter unit to be 90 degrees/N-1, and switching the sliding mode controller into a PI controller.
5. The method for controlling the high voltage dc power supply according to claim 3, further comprising, before the step of collecting the reference voltage:
designing an output voltage range of the dual active bridge converter.
6. The HVDC power supply control method of claim 5, wherein the designing the output voltage range of the dual active bridge converter comprises:
and designing the output voltage range of the double-active-bridge converter according to the voltage regulating range of the double-active-bridge converter at the maximum power output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211090450.5A CN115603582A (en) | 2022-09-07 | 2022-09-07 | High-voltage direct-current power supply and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211090450.5A CN115603582A (en) | 2022-09-07 | 2022-09-07 | High-voltage direct-current power supply and control method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN115603582A true CN115603582A (en) | 2023-01-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211090450.5A Pending CN115603582A (en) | 2022-09-07 | 2022-09-07 | High-voltage direct-current power supply and control method thereof |
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| CN (1) | CN115603582A (en) |
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- 2022-09-07 CN CN202211090450.5A patent/CN115603582A/en active Pending
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