CN112583244B - 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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- CN112583244B CN112583244B CN201910930101.1A CN201910930101A CN112583244B CN 112583244 B CN112583244 B CN 112583244B CN 201910930101 A CN201910930101 A CN 201910930101A CN 112583244 B CN112583244 B CN 112583244B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- 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
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Abstract
The invention provides a voltage-sharing control device and method of a direct-current bus capacitor in the pre-charging process of a power electronic transformer system, in the device, corresponding to each power module, a control unit detects the voltage of the direct-current bus capacitor, and controls a first bypass switch to be closed according to a closing instruction and controls the first bypass switch to be opened according to an opening 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 closing 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, an opening 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 direct current bus capacitor to achieve the purpose of eliminating the voltage difference of the capacitor, but the parallel balance resistor consumes power, reduces the efficiency of the whole system, and increases the volume and cost of the 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, so that the energy consumption can be reduced, the system efficiency can be improved, and the volume and the cost of the system can be reduced.
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 a first bypass switch arranged corresponding to each power module, A control unit, wherein the pre-charge switch is connected in parallel with the pre-charge resistor; the first bypass switch is connected in parallel to the alternating current input end corresponding to each power module, the control unit is respectively connected with the direct current bus capacitor and the first bypass switch, and the control unit is used for detecting the voltage of the direct current bus capacitor, controlling the first bypass switch to be closed according to a closing instruction and controlling the first bypass switch to be opened according to an opening 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 closing 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 opening instruction to the control unit corresponding to the power module.
The multiple increasing preset voltage values are all at 0 and the highest voltage U which can be borne by the direct-current bus capacitormaxIn the meantime.
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 closing instruction to the control unit corresponding to the power module to control the closing of the first bypass switch corresponding to the power module; s4, when the voltages of the dc bus capacitors in all the power modules reach the preset voltage value, sending an off command to the control unit corresponding to the power module to control the first bypass switch corresponding to the power module to be turned off, and executing steps S3 and S4 sequentially with a plurality of increasing preset voltage values.
The invention has the beneficial effects that:
the invention controls the closing of the first bypass switch corresponding to each power module 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 larger than a preset voltage value in the pre-charging process of the power electronic transformer, to stop charging the DC bus capacitors in the power modules, and to control the first bypass switch corresponding to the power module to be turned off when the voltages of the DC bus capacitors in all the power modules reach a preset voltage value, so as to continuously charge the DC bus capacitor in the power module, and repeat the steps with a plurality of increasing preset voltage values, therefore, the voltage sharing of each direct current bus capacitor can be realized when the power electronic transformer is precharged without arranging a balance resistor in a system circuit of the power electronic transformer, so that the energy consumption can be reduced, the system efficiency can be improved, and the volume and the cost of the system can be reduced.
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 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 R 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, a first bypass switch 30 and a control unit 40, which are provided for each power module. The pre-charging switch 10 is connected in parallel with the pre-charging resistor R; corresponding to each power module, the first bypass switch 30 is connected in parallel to the alternating current input end, the control unit 40 is respectively connected with the direct current bus capacitor C and the first bypass switch 30, and the control unit 40 is used for detecting the voltage of the direct current bus capacitor C, controlling the first bypass switch 30 to be closed according to a closing instruction and controlling the first bypass switch 30 to be opened according to an opening instruction; the main control module 20 is respectively connected to the pre-charge switch 10 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, receive the voltage of the dc bus capacitor C detected by each control unit 40, and sequentially perform the following control with 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 closing instruction is sent to the control unit 40 corresponding to the power module, and when the voltage of the dc bus capacitors C in all power modules reaches the preset voltage value, an opening instruction is sent to the control unit 40 corresponding to the power module.
Wherein, the plurality of gradually increased preset voltage values are all at 0 and the highest voltage U which can be borne by the direct current bus capacitor CmaxIn the meantime. For example, the plurality of increasing preset voltage values may be Umax/2、3Umax/5、7Umax/10、4Umax/5、9Umax/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.
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, 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 first bypass switch corresponding to the power module is controlled to be closed so as to stop charging the direct-current bus capacitor in the power module, and when the voltage of the direct-current bus capacitor in all the power modules reaches the preset voltage value, the first bypass switch corresponding to the power module is controlled to be opened so as to continue charging 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 by repeating the plurality of gradually increased preset voltage values for a plurality of times without arranging a balancing resistor in the circuit of the power electronic transformer system, the energy consumption can be reduced, the system efficiency can be improved, and the volume and the cost of the system can be reduced.
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. 3, the voltage-sharing control method for a dc bus capacitor in a power electronic transformer system according to an 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 closing instruction to the control unit corresponding to the power module to control the closing of the first bypass switch corresponding to the power module.
And S4, when the voltage of the DC bus capacitors in all the power modules reaches a preset voltage value, sending an off instruction to the control unit corresponding to the power module to control the first bypass switch corresponding to the power module to be off.
Steps S3 and S4 are sequentially performed at a plurality of incremented preset voltage values.
For example, the voltage of the dc bus capacitor in any power module is greater than UmaxWhen the voltage exceeds 2, a closing instruction is sent to a control unit corresponding to the power module so as to control a first bypass switch corresponding to the power module to be closed; the voltage of the direct current bus capacitor in all the power modules reaches UmaxAnd when the voltage exceeds 2, sending an opening instruction to the control unit corresponding to the power module so as to control the first bypass switch corresponding to the power module to be opened. Then, the preset voltage value is sequentially set to be 3Umax/5、7Umax/10、4Umax/5、9UmaxThe/10 controls the closing and opening of the first bypass switch, and can make the voltage of the direct current bus capacitor in the plurality of power modules gradually approach the balance.
According to the voltage-sharing control method of the direct-current bus capacitor in the power electronic transformer system, 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 first bypass switch corresponding to the power module is controlled to be closed so as to stop charging the direct-current bus capacitor in the power module, and when the voltage of the direct-current bus capacitor in all the power modules reaches the preset voltage value, the first bypass switch corresponding to the power module is controlled to be opened so as to continue charging the direct-current bus capacitor in the power module, and the charging is repeated for a plurality of times by a plurality of increasing preset voltage values, so that the voltage-sharing of each direct-current bus capacitor in the pre-charging process can be realized without arranging a balancing resistor in a circuit of the power electronic transformer system, the energy consumption can be reduced, the system efficiency can be improved, and the volume and the cost of the system can be reduced.
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 (6)
1. A voltage-sharing control device of a direct-current bus capacitor in a 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 a first bypass switch arranged corresponding to each power module, A control unit, wherein,
the pre-charging switch is connected with the pre-charging resistor in parallel;
the first bypass switch is connected in parallel to the alternating current input end corresponding to each power module, the control unit is respectively connected with the direct current bus capacitor and the first bypass switch, and the control unit is used for detecting the voltage of the direct current bus capacitor, controlling the first bypass switch to be closed according to a closing instruction and controlling the first bypass switch to be opened according to an opening 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 closing 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 opening instruction to the control unit corresponding to the power module.
2. The method of claim 1The voltage-sharing control device for the direct-current bus capacitor in the power electronic transformer system is characterized in that the plurality of gradually increased preset voltage values are all at 0 and the highest voltage U which can be borne by the direct-current bus capacitormaxIn the meantime.
3. 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.
4. 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.
5. 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.
6. 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 1-5 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 closing instruction to the control unit corresponding to the power module to control the closing of the first bypass switch corresponding to the power module;
s4, when the voltage of the DC bus capacitor in all the power modules reaches the preset voltage value, sending an off instruction to the control unit corresponding to the power module to control the first bypass switch corresponding to the power module to be off,
steps S3 and S4 are sequentially performed at a plurality of incremented preset voltage values.
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| JP5484985B2 (en) * | 2010-03-29 | 2014-05-07 | 三洋電機株式会社 | Power supply device and vehicle equipped with this power supply device |
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| CN101369741A (en) * | 2008-07-09 | 2009-02-18 | 南京航空航天大学 | Apparatus and method for electric voltage equalization of accumulator units connected in series |
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Effective date of registration: 20211027 Address after: Room 354, No. 18, Xinya Road, Wujin high tech Industrial Development Zone, Changzhou City, Jiangsu Province Applicant after: Guochuang mobile energy innovation center (Jiangsu) Co.,Ltd. Applicant after: Wanbang Digital Energy Co.,Ltd. Applicant after: Wanbang star Charging Technology Co.,Ltd. Address before: Room 354, No. 18, Xinya Road, Wujin high tech Industrial Development Zone, Changzhou City, Jiangsu Province Applicant before: Guochuang mobile energy innovation center (Jiangsu) Co.,Ltd. |
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Address after: 213000 5-a201, chuangyangang, Changzhou science and Education City, No. 18, Changwu Middle Road, Wujin District, Changzhou City, Jiangsu Province Patentee after: Guochuang mobile energy innovation center (Jiangsu) Co.,Ltd. Patentee after: Wanbang Digital Energy Co.,Ltd. Patentee after: Wanbang star Charging Technology Co.,Ltd. Address before: Room 354, No. 18, Xinya Road, Wujin high tech Industrial Development Zone, Changzhou City, Jiangsu Province Patentee before: Guochuang mobile energy innovation center (Jiangsu) Co.,Ltd. Patentee before: Wanbang Digital Energy Co.,Ltd. Patentee before: Wanbang star Charging Technology Co.,Ltd. |
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