CN112994410B - Voltage-sharing control device and method for direct-current bus capacitor of power electronic transformer system - Google Patents
Voltage-sharing control device and method for direct-current bus capacitor of power electronic transformer system Download PDFInfo
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- CN112994410B CN112994410B CN201911291588.XA CN201911291588A CN112994410B CN 112994410 B CN112994410 B CN 112994410B CN 201911291588 A CN201911291588 A CN 201911291588A CN 112994410 B CN112994410 B CN 112994410B
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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
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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
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
Abstract
The invention provides a voltage-sharing control device and a voltage-sharing control method for a direct-current bus capacitor in the pre-charging process of a power electronic transformer system, wherein in the device, a control unit detects the voltage of the direct-current bus capacitor corresponding to each power module, and controls an auxiliary source to charge according to a charging instruction and controls the auxiliary source to stop charging according to a charging stopping instruction; the main control module is used for controlling the pre-charging switch to be switched off to charge each direct current bus capacitor when the power electronic transformer system is started, receiving the voltage of the direct current bus capacitor detected by each control unit, and sequentially controlling the direct current bus capacitors according to a plurality of increasing preset voltage values as follows: when the voltage of the direct current bus capacitor in any power module is larger than a preset voltage value, a charging instruction is sent to the control unit corresponding to the power module, and when the voltage of the direct current bus capacitor in all the power modules reaches the preset voltage value, a charging stopping instruction is sent to the control unit corresponding to the power module.
Description
Technical Field
The invention relates to the technical field of power electronic transformer systems, in particular to a voltage-sharing control device of a direct-current bus capacitor in a pre-charging process of a power electronic transformer system and a voltage-sharing control method of the direct-current bus capacitor in the power electronic transformer system.
Background
In a power electronic transformer system, an AC/DC bus in each power module is connected with a DC bus capacitor in parallel, and when the power electronic transformer is started, the capacitors may not be equalized when the DC bus capacitor is precharged. The current common solution is to connect a balance resistor in parallel beside a dc bus capacitor to achieve the purpose of eliminating the voltage non-equalizing of the capacitor, but the parallel balance resistor consumes power and reduces the efficiency of the whole system.
Disclosure of Invention
The invention provides a voltage-sharing control device and method for a direct-current bus capacitor in a power electronic transformer system, aiming at solving the technical problems, and the voltage-sharing control device and method can reduce energy consumption and improve system efficiency.
The technical scheme adopted by the invention is as follows:
a voltage-sharing control device of a direct-current bus capacitor in a power electronic transformer system comprises a plurality of power modules, alternating-current input ends of the power modules are sequentially connected in series and are connected with an alternating-current power supply through pre-charging resistors, direct-current output ends of the power modules are connected in parallel, each power module comprises an AC/DC unit and a DC// DC resonance unit, an alternating-current side of the AC/DC unit is used as an alternating-current input end of the power module, a direct-current side of the AC/DC unit is connected with the direct-current bus capacitor in parallel, one side of the DC// DC resonance unit is connected with the direct-current side of the AC/DC unit, the other side of the DC// DC resonance unit is used as a direct-current output end of the power module, and the voltage-sharing control device comprises a pre-charging switch, a main control module and an auxiliary source arranged corresponding to each power module, A control unit, wherein the pre-charge switch is connected in parallel with the pre-charge resistor; the input end of the auxiliary source is connected to the direct current side of the AC/DC unit in parallel corresponding to each power module, the output end of the auxiliary source is connected to the control part of the power module, the control unit is respectively connected with the direct current bus capacitor and the auxiliary source, and the control unit is used for detecting the voltage of the direct current bus capacitor, controlling the auxiliary source to charge according to a charging instruction and controlling the auxiliary source to stop charging according to a charging stopping instruction; the main control module is respectively connected with the pre-charging switch and each control unit, and is used for controlling the pre-charging switch to be disconnected when the power electronic transformer system is started so as to charge the direct-current bus capacitor in each power module, receiving the voltage of the direct-current bus capacitor detected by each control unit, and sequentially controlling the pre-charging switch and each control unit according to a plurality of increasing preset voltage values as follows: and when the voltage of the direct current bus capacitor in any power module is greater than a preset voltage value, sending the charging instruction to the control unit corresponding to the power module, and when the voltage of the direct current bus capacitor in all the power modules reaches the preset voltage value, sending the charging stopping instruction to the control unit corresponding to the power module.
The incremental preset voltage values are all between 0 and the highest voltage Umax which can be borne by the direct current bus capacitor.
The main control module is further configured to send a discharge instruction to the control unit corresponding to each power module after the power electronic transformer system is started to operate, so that each control unit controls the auxiliary source to discharge to the control portion of the corresponding power module according to the discharge instruction.
The auxiliary source comprises: one end of the primary side of the transformer is used as one end of the input end of the auxiliary source, and one end of the secondary side of the transformer is used as one end of the output end of the auxiliary source; a first pole of the first switch tube is connected with the other end of the primary side of the transformer, a second pole of the first switch tube is used as the other end of the input end of the auxiliary source, and a control pole of the first switch tube is connected with the control unit; the anode of the rectifier diode is connected with the other end of the secondary side of the transformer, and the cathode of the rectifier diode is used as the other end of the output end of the auxiliary source; a first pole of the second switching tube is connected with the cathode of the rectifier diode, and a control pole of the second switching tube is connected with the control unit; one end of the protection resistor is connected with the second pole of the second switching tube; the positive electrode of the battery is connected with the other end of the protection resistor, and the negative electrode of the battery is connected with one end of the secondary side of the transformer; and one end of the filter capacitor is connected with the cathode of the rectifier diode, and the other end of the filter capacitor is connected with one end of the secondary side of the transformer.
The first switch tube and the second switch tube are both PMOS tubes, the first switch tube is a PMOS tube drain electrode, the second switch tube is a PMOS tube source electrode, and the control electrode is a PMOS tube grid electrode.
The power electronic transformer system is a single-phase system or a three-phase system.
The main control module is connected with each control unit through optical fibers.
And when the main control module does not receive the voltage of the direct current bus capacitor detected by a certain control unit within the preset time, judging that the power module corresponding to the control unit has a fault.
A voltage-sharing control method based on a voltage-sharing control device of a direct-current bus capacitor in the power electronic transformer system comprises the following steps: s1, controlling the pre-charging switch to be switched off when the power electronic transformer system is started so as to charge the direct current bus capacitor in each power module; s2, each control unit detects the voltage of the direct current bus capacitor in the corresponding power module; s3, when the voltage of the direct current bus capacitor in any power module is larger than a preset voltage value, sending a charging instruction to the control unit corresponding to the power module to control the auxiliary source corresponding to the power module to charge; s4, when the voltages of the dc bus capacitors in all the power modules reach the preset voltage value, sending a stop charging command to the control unit corresponding to the power module to control the auxiliary source corresponding to the power module to stop charging, and performing steps S3 and S4 sequentially with a plurality of increasing preset voltage values.
After the power electronic transformer system is started to operate, the method further comprises the following steps: and sending a discharging instruction to the control unit corresponding to each power module so that each control unit controls the auxiliary source to discharge to the control part of the corresponding power module according to the discharging instruction.
The invention has the beneficial effects that:
according to the invention, by detecting the voltage of the direct current bus capacitor in each power module, when the voltage of the direct current bus capacitor in any power module is greater than a preset voltage value in the pre-charging process of the power electronic transformer, the auxiliary source corresponding to the power module is controlled to charge so as to prevent the voltage of the direct current bus capacitor in the power module from further increasing, and when the voltage of the direct current bus capacitors in all the power modules reaches the preset voltage value, the auxiliary source corresponding to the power module is controlled to stop charging so as to continuously increase the voltage of the direct current bus capacitor in the power module, and the voltage equalization of the direct current bus capacitors can be realized during the pre-charging of the power electronic transformer by repeating the preset voltage values increased progressively for multiple times.
Drawings
FIG. 1 is a circuit topology diagram of a power electronic transformer system in accordance with one embodiment of the present invention;
fig. 2 is a schematic block diagram of a voltage-sharing control device for a dc bus capacitor in a power electronic transformer system according to an embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of an auxiliary source according to an embodiment of the present invention;
fig. 4 is a flowchart of a voltage-sharing control method for a dc bus capacitor in a power electronic transformer system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
As shown in fig. 1, the power electronic transformer system according to the embodiment of the present invention includes a plurality of power modules, ac input terminals of the plurality of power modules are sequentially connected in series and are connected to an ac power supply through a pre-charging resistor Rp and an inductor L, and dc output terminals of the plurality of power modules are connected in parallel. In one embodiment of the invention, the power electronic transformer system may be a single phase system or a three phase system. Fig. 1 shows a single-phase system, in which the live and neutral terminals of a single-phase power supply are connected to the two ends of a plurality of ac input terminals connected in series. When the power electronic transformer system is a three-phase system, each phase line of a three-phase power supply is connected with one end of at least one alternating current input end in series, and the other end of the at least one alternating current input end in series is connected with a zero line or three-phase star-shaped or angle-shaped connection.
As shown in fig. 1, each power module includes an AC/DC unit and a DC// DC resonance unit, an AC side of the AC/DC unit is used as an AC input terminal of the power module, a DC side of the AC/DC unit is connected in parallel with a DC bus capacitor C, and one side of the DC// DC resonance unit is connected to the DC side of the AC/DC unit, and the other side is used as a DC output terminal of the power module.
As shown in fig. 1 and 2, the voltage equalizing control apparatus according to the embodiment of the present invention includes a pre-charge switch 10, a main control module 20, and an auxiliary source 30 and a control unit 40 provided corresponding to each power module. The pre-charging switch 10 is connected in parallel with the pre-charging resistor Rp; corresponding to each power module, the input end of the auxiliary source 30 is connected in parallel to the direct current side of the AC/DC unit, the output end of the auxiliary source 30 is connected to the control part of the power module, the control unit 40 is respectively connected to the direct current bus capacitor C and the auxiliary source 30, the control unit 40 is used for detecting the voltage of the direct current bus capacitor C, and is used for controlling the auxiliary source 30 to charge according to the charging instruction and controlling the auxiliary source 30 to stop charging according to the charging stopping instruction; the main control module 20 is connected to the pre-charge switch Rp and each control unit 40, and the main control module 20 is configured to control the pre-charge switch 10 to be disconnected to charge the dc bus capacitor C in each power module when the power electronic transformer system is started, and receive the voltage of the dc bus capacitor C detected by each control unit 40, and sequentially perform the following control according to a plurality of increasing preset voltage values: when the voltage of the dc bus capacitor C in any power module is greater than the preset voltage value, a charging instruction is sent to the control unit 40 corresponding to the power module, and when the voltages of the dc bus capacitors C in all power modules reach the preset voltage value, a charging stop instruction is sent to the control unit 40 corresponding to the power module.
The preset voltage values which are gradually increased are all between 0 and the highest voltage Umax which can be borne by the direct current bus capacitor C. For example, the plurality of incremental preset voltage values may be Umax/2, 3Umax/5, 7Umax/10, 4Umax/5, 9 Umax/10. The charging control of the direct current bus capacitor in each power module is performed by using a plurality of increasing preset voltage values, so that the voltage of the direct current bus capacitor in the plurality of power modules gradually approaches to balance.
Further, the main control module 20 may also send a discharge instruction to the control unit 40 corresponding to each power module after the power electronic transformer system is started to operate, so that each control unit 40 controls the auxiliary source 30 to discharge to the control portion of the corresponding power module according to the discharge instruction.
In one embodiment of the present invention, as shown in fig. 3, the auxiliary source 30 includes a transformer T, a first switching tube Q1, a rectifier diode D, a second switching tube Q2, a protection resistor R, a battery B, and a filter capacitor Cf. One end of the primary side of the transformer T is used as one end of the input end of the auxiliary source 30, and one end of the secondary side of the transformer T is used as one end of the output end of the auxiliary source 30; a first pole of the first switch Q1 is connected to the other end of the primary side of the transformer T, a second pole of the first switch Q1 is used as the other end of the input end of the auxiliary source 30, and a control pole of the first switch Q1 is connected to the control unit 40; the anode of the rectifier diode D is connected to the other end of the secondary side of the transformer T, and the cathode of the rectifier diode D serves as the other end of the output terminal of the auxiliary source 30; a first pole of the second switching tube Q2 is connected to the cathode of the rectifier diode D, and a control pole of the second switching tube Q2 is connected to the control unit 40; one end of the protection resistor R is connected to the second pole of the second switch Q2; the positive pole of the battery B is connected with the other end of the protective resistor R, and the negative pole of the battery B is connected with one end of the secondary side of the transformer T; one end of the filter capacitor Cf is connected with the cathode of the rectifier diode D, and the other end of the filter capacitor Cf is connected with one end of the secondary side of the transformer T.
The first switch Q1 and the second switch Q2 may be both PMOS transistors, the first is a drain of the PMOS transistor, the second is a source of the PMOS transistor, and the control electrode is a gate of the PMOS transistor.
Based on the auxiliary source 30 with the above structure, the control unit 40 may input a PWM signal with a corresponding duty ratio to the control electrode of the first switching tube Q1 to control the first switching tube Q1 to implement single-tube inversion, convert the direct current at the direct current side of the AC/DC unit into an alternating current, transform the voltage through the transformer, and output a stable direct current through single-tube rectification of the rectifier diode D and filtering of the filter capacitor Cf. When the auxiliary source needs to be controlled to charge, besides the first switching tube Q1 is controlled to realize single-tube inversion, a conduction signal can be input to the control electrode of the second switching tube Q2 to control the conduction of the second switching tube Q2, and the direct current rectified by the rectifier diode D can charge the battery B; when the auxiliary source needs to be controlled to stop charging, the second switching tube Q2 can be controlled to be switched off by stopping inputting the conducting signal to the control electrode of the second switching tube Q2; when the auxiliary source needs to be controlled to discharge, the second switch tube Q2 can be controlled to be turned on by inputting a turn-on signal to the control electrode of the second switch tube Q2, so that the battery B is discharged to the control part of the power module. In the embodiment of the present invention, the control part of the power module mainly executes the control function when the power electronic transformer system is in normal operation, and of course, the control part may also include the control unit 40 of the embodiment of the present invention. In addition, when controlling the charging of each auxiliary source 30, the charging current may be adjusted by adjusting the duty ratio of the on signal of the second switching tube Q2 in each auxiliary source 30, so that the voltage of the dc bus capacitor in each power module is as close as possible.
In an embodiment of the present invention, the main control module 20 may be connected to each control unit 40 through an optical fiber, that is, the main control module 20 and each control unit 40 may perform transmission of voltage detection data and control commands through optical fiber communication.
According to the voltage-sharing control device of the direct current bus capacitor in the power electronic transformer system of the embodiment of the invention, by detecting the voltage of the direct current bus capacitor in each power module, when the voltage of the direct current bus capacitor in any power module in the pre-charging process of the power electronic transformer is larger than the preset voltage value, the auxiliary source corresponding to the power module is controlled to be charged so as to prevent the voltage of the direct current bus capacitor in the power module from further increasing, and when the voltage of the direct current bus capacitor in all the power modules reaches the preset voltage value, the auxiliary source corresponding to the power module is controlled to stop charging so as to continuously increase the voltage of the direct current bus capacitor in the power module, and the voltage-sharing control device is repeated for a plurality of times by a plurality of increasing preset voltage values, therefore, a balancing resistor does not need to be arranged in a circuit of the power electronic transformer system, and the voltage-sharing of each direct current bus capacitor can be realized during the pre-charging of the power electronic transformer, the energy consumption can be reduced, and the system efficiency is improved.
In addition, in an embodiment of the present invention, when the main control module 20 does not receive the voltage of the dc bus capacitor detected by a certain control unit 40 within a preset time, it may determine that the power module corresponding to the control unit 40 has a fault.
Based on the voltage-sharing control device of the direct-current bus capacitor in the power electronic transformer system of the embodiment, the invention also provides a voltage-sharing control method of the direct-current bus capacitor in the power electronic transformer system.
As shown in fig. 4, the voltage-sharing control method for a dc bus capacitor in a power electronic transformer system according to the embodiment of the present invention includes the following steps:
and S1, controlling the pre-charging switch to be switched off to charge the direct current bus capacitor in each power module when the power electronic transformer system is started.
And S2, each control unit detects the voltage of the direct current bus capacitor in the corresponding power module.
And S3, when the voltage of the direct current bus capacitor in any power module is greater than a preset voltage value, sending a charging instruction to the control unit corresponding to the power module to control the auxiliary source corresponding to the power module to charge.
And S4, when the voltage of the direct current bus capacitors in all the power modules reaches a preset voltage value, sending a charging stopping instruction to the control unit corresponding to the power module to control the auxiliary source corresponding to the power module to stop charging.
Steps S3 and S4 are sequentially performed at a plurality of incremented preset voltage values.
For example, first, when the voltage of the dc bus capacitor in any power module is greater than Umax/2, a charging instruction may be sent to the control unit corresponding to the power module to control the auxiliary source corresponding to the power module to charge; and when the voltage of the direct current bus capacitors in all the power modules reaches Umax/2, sending a charging stopping instruction to the control unit corresponding to the power module so as to control the auxiliary source corresponding to the power module to stop charging. And then, the charging and the stopping of the charging of the auxiliary source are controlled by sequentially using preset voltage values of 3Umax/5, 7Umax/10, 4Umax/5 and 9Umax/10, so that the voltages of the direct current bus capacitors in the plurality of power modules can gradually approach the balance.
After the power electronic transformer system is started to operate, a discharging instruction can be sent to the control unit corresponding to each power module, so that each control unit controls the auxiliary source to discharge to the control part of the corresponding power module according to the discharging instruction.
According to the voltage-sharing control method of the direct current bus capacitor in the power electronic transformer system of the embodiment of the invention, by detecting the voltage of the direct current bus capacitor in each power module, when the voltage of the direct current bus capacitor in any power module in the pre-charging process of the power electronic transformer is larger than the preset voltage value, the auxiliary source corresponding to the power module is controlled to be charged so as to prevent the voltage of the direct current bus capacitor in the power module from further increasing, and when the voltage of the direct current bus capacitor in all the power modules reaches the preset voltage value, the auxiliary source corresponding to the power module is controlled to stop charging so as to continuously increase the voltage of the direct current bus capacitor in the power module, and the voltage-sharing of each direct current bus capacitor can be realized during the pre-charging of the power electronic transformer without arranging a balancing resistor in a circuit of the power electronic transformer system, the energy consumption can be reduced, and the system efficiency is improved.
In addition, when the voltage of the direct current bus capacitor in a certain power module is not received within the preset time, the power module is judged to be in fault.
In the description of the present invention, the terms "first" and "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. The meaning of "plurality" is two or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The voltage-sharing control device of the direct-current bus capacitor in the power electronic transformer system is characterized in that the power electronic transformer system comprises a plurality of power modules, alternating-current input ends of the power modules are sequentially connected in series and are connected with an alternating-current power supply through a pre-charging resistor, direct-current output ends of the power modules are connected in parallel, each power module comprises an AC/DC unit and a DC/DC resonance unit, an alternating-current side of the AC/DC unit is used as an alternating-current input end of the power module, a direct-current side of the AC/DC unit is connected with the direct-current bus capacitor in parallel, one side of the DC/DC resonance unit is connected with the direct-current side of the AC/DC unit, the other side of the DC/DC resonance unit is used as a direct-current output end of the power module, and the voltage-sharing control device comprises a pre-charging switch, a main control module and an auxiliary source, a direct-current bus capacitor and a direct-current output end, wherein the auxiliary source is arranged corresponding to each power module, A control unit, wherein,
the pre-charging switch is connected with the pre-charging resistor in parallel;
the input end of the auxiliary source is connected to the direct current side of the AC/DC unit in parallel corresponding to each power module, the output end of the auxiliary source is connected to the control part of the power module, the control unit is respectively connected with the direct current bus capacitor and the auxiliary source, and the control unit is used for detecting the voltage of the direct current bus capacitor, controlling the auxiliary source to charge according to a charging instruction and controlling the auxiliary source to stop charging according to a charging stopping instruction;
the main control module is respectively connected with the pre-charging switch and each control unit, and is used for controlling the pre-charging switch to be disconnected when the power electronic transformer system is started so as to charge the direct-current bus capacitor in each power module, receiving the voltage of the direct-current bus capacitor detected by each control unit, and sequentially controlling the pre-charging switch and each control unit according to a plurality of increasing preset voltage values as follows: and when the voltage of the direct current bus capacitor in any power module is greater than a preset voltage value, sending the charging instruction to the control unit corresponding to the power module, and when the voltage of the direct current bus capacitor in all the power modules reaches the preset voltage value, sending the charging stopping instruction to the control unit corresponding to the power module.
2. A voltage-sharing control device for a DC bus capacitor in a power electronic transformer system according to claim 1, wherein the preset voltage values in a plurality of increments are all between 0 and the highest voltage Umax that the DC bus capacitor can bear.
3. The voltage-sharing control device for the direct-current bus capacitor in the power electronic transformer system according to claim 2, wherein the main control module is further configured to send a discharge instruction to the control unit corresponding to each power module after the power electronic transformer system is started to operate, so that each control unit controls the auxiliary source to discharge to the control portion of the corresponding power module according to the discharge instruction.
4. A voltage-sharing control device for dc bus capacitors in a power electronic transformer system according to claim 3, wherein said auxiliary source comprises:
one end of the primary side of the transformer is used as one end of the input end of the auxiliary source, and one end of the secondary side of the transformer is used as one end of the output end of the auxiliary source;
a first pole of the first switch tube is connected with the other end of the primary side of the transformer, a second pole of the first switch tube is used as the other end of the input end of the auxiliary source, and a control pole of the first switch tube is connected with the control unit;
the anode of the rectifier diode is connected with the other end of the secondary side of the transformer, and the cathode of the rectifier diode is used as the other end of the output end of the auxiliary source;
a first pole of the second switching tube is connected with the cathode of the rectifier diode, and a control pole of the second switching tube is connected with the control unit;
one end of the protection resistor is connected with the second pole of the second switching tube;
the positive electrode of the battery is connected with the other end of the protection resistor, and the negative electrode of the battery is connected with one end of the secondary side of the transformer;
and one end of the filter capacitor is connected with the cathode of the rectifier diode, and the other end of the filter capacitor is connected with one end of the secondary side of the transformer.
5. A voltage-sharing control device for DC bus capacitor in power electronic transformer system according to claim 4, wherein said first switch and said second switch are both PMOS transistors, said first switch is the drain of PMOS transistor, said second switch is the source of PMOS transistor, and said control is the gate of PMOS transistor.
6. A voltage-sharing control device for DC bus capacitor in power electronic transformer system according to claim 1, wherein said power electronic transformer system is a single-phase system or a three-phase system.
7. A voltage-sharing control device for DC bus capacitors in a power electronic transformer system according to claim 1, wherein said master control module is connected to each of said control units via optical fibers.
8. The voltage-sharing control device for the dc bus capacitor in the power electronic transformer system according to claim 1, wherein the main control module determines that the power module corresponding to a certain control unit fails when the main control module does not receive the voltage of the dc bus capacitor detected by the control unit within a preset time.
9. A voltage-sharing control method based on the voltage-sharing control device of the DC bus capacitor in the power electronic transformer system of any one of claims 1-8 is characterized by comprising the following steps:
s1, controlling the pre-charging switch to be switched off when the power electronic transformer system is started so as to charge the direct current bus capacitor in each power module;
s2, each control unit detects the voltage of the direct current bus capacitor in the corresponding power module;
s3, when the voltage of the direct current bus capacitor in any power module is larger than a preset voltage value, sending a charging instruction to the control unit corresponding to the power module to control the auxiliary source corresponding to the power module to charge;
s4, when the voltage of the DC bus capacitor in all the power modules reaches the preset voltage value, sending a charging stop instruction to the control unit corresponding to the power module to control the auxiliary source corresponding to the power module to stop charging,
steps S3 and S4 are sequentially performed at a plurality of incremented preset voltage values.
10. The voltage-sharing control method according to claim 9, further comprising, after the power electronic transformer system is started up and operated:
and sending a discharging instruction to the control unit corresponding to each power module so that each control unit controls the auxiliary source to discharge to the control part of the corresponding power module according to the discharging instruction.
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| JP7148476B2 (en) * | 2019-10-25 | 2022-10-05 | 株式会社東芝 | Power switch, power rectifier and power converter |
| CN113726177A (en) * | 2021-08-03 | 2021-11-30 | 华为数字能源技术有限公司 | Power unit and solid-state transformer |
| CN113972817A (en) * | 2021-09-22 | 2022-01-25 | 华为数字能源技术有限公司 | Solid-state transformer fault handling system |
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| CN103944434A (en) * | 2014-05-09 | 2014-07-23 | 北京四方继保自动化股份有限公司 | Static voltage-sharing system of chained multi-level converter power module |
| CN104578859A (en) * | 2015-01-19 | 2015-04-29 | 西安交通大学 | Voltage-sharing controlling method for direct current bus voltage of single-phase power electronic transformer |
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| CN108574301A (en) * | 2018-04-28 | 2018-09-25 | 扬州大学 | It is a kind of to have the distributed photovoltaic integrated package controller pressed |
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