CN109149957B - Three-phase power electronic transformer - Google Patents

Three-phase power electronic transformer Download PDF

Info

Publication number
CN109149957B
CN109149957B CN201811376618.2A CN201811376618A CN109149957B CN 109149957 B CN109149957 B CN 109149957B CN 201811376618 A CN201811376618 A CN 201811376618A CN 109149957 B CN109149957 B CN 109149957B
Authority
CN
China
Prior art keywords
switching tube
potential end
module
low potential
unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201811376618.2A
Other languages
Chinese (zh)
Other versions
CN109149957A (en
Inventor
王毅颖
刘扬
刘建功
郭进喜
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hebei University of Engineering
Original Assignee
Hebei University of Engineering
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hebei University of Engineering filed Critical Hebei University of Engineering
Priority to CN201811376618.2A priority Critical patent/CN109149957B/en
Publication of CN109149957A publication Critical patent/CN109149957A/en
Application granted granted Critical
Publication of CN109149957B publication Critical patent/CN109149957B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H02M3/33592—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 having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • 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
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
    • 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
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/4807—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode having a high frequency intermediate AC stage
    • 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
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • 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
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/007—Plural converter units in cascade

Abstract

The invention discloses a three-phase power electronic transformer, which comprises a rectification module, an isolation module, an inversion module and a control module, wherein the rectification module is connected with the isolation module; the rectifier module is connected with three-phase power, the rectifier module is connected with the isolation module, the isolation module is connected with the inversion module, the inversion module outputs three-phase alternating current, and the control module is respectively connected with the rectifier module, the isolation module and the inversion module. The invention can realize voltage transformation and frequency conversion control by adopting a corresponding control strategy through the control module according to the load working requirement, and can well adapt to various working requirements.

Description

Three-phase power electronic transformer
Technical Field
The invention relates to the technical field of semiconductor manufacturing, in particular to a three-phase power electronic transformer.
Background
The electronic power transformer is a novel intelligent transformer which combines a power electronic conversion technology and an electric energy conversion technology based on an electromagnetic induction principle to convert electric energy with one electric characteristic into electric energy with another electric characteristic.
In the prior art, the power electronic transformer has single function and cannot be well adapted to various working environments.
Disclosure of Invention
The embodiment of the invention provides a three-phase power electronic transformer, and aims to solve the problem that the transformer cannot be well suitable for various working environments due to single function in the prior art.
The first aspect of the embodiment of the invention provides a three-phase power electronic transformer, which comprises a rectification module, an isolation module, an inversion module and a control module;
the rectification module is connected with three-phase power, the rectification module is connected with the isolation module, the isolation module is connected with the inversion module, the inversion module outputs three-phase alternating current, and the control module is respectively connected with the rectification module, the isolation module and the inversion module;
the control module controls the rectification module to rectify three-phase electricity in the power grid to generate a first direct current and output the first direct current to the isolation module, the control module controls the isolation module to isolate the first direct current to generate a second direct current and output the second direct current to the inversion module, and the control module controls the inversion module to invert the second direct current to output the required three-phase alternating current.
In one embodiment, the rectification module includes a first rectification unit and a first voltage stabilization unit;
the first rectifying unit is connected with three-phase power and is connected with the first voltage stabilizing unit;
first rectification unit carries out the rectification to the three-phase electricity in the electric wire netting and generates first direct current exports first voltage stabilizing unit, first voltage stabilizing unit is right first direct current carries out steady voltage and handles to after with the steady voltage first direct current exports to isolation module.
In one embodiment, the first rectifying unit comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube and a sixth switching tube;
the high potential end of the first switch tube, the high potential end of the second switch tube and the high potential end of the third switch tube are connected, the low potential end of the first switch tube is connected with the high potential end of the fourth switch tube, the low potential end of the second switch tube is connected with the high potential end of the fifth switch tube, the low potential end of the third switch tube is connected with the high potential end of the sixth switch tube, the low potential end of the fourth switch tube, the low potential end of the fifth switch tube and the low potential end of the sixth switch tube are connected, and the low potential end of the first switch tube, the low potential end of the second switch tube and the low potential end of the third switch tube are connected with three-phase power.
In one embodiment, the first voltage stabilization unit includes a first capacitor;
the first end of the first capacitor is connected with the high potential end of the first switch tube, the high potential end of the second switch tube and the high potential end of the third switch tube in a sharing mode, and the second end of the first capacitor is connected with the low potential end of the fourth switch tube, the low potential end of the fifth switch tube and the low potential end of the sixth switch tube in a sharing mode.
In one embodiment, the isolation module includes a transformer, an inversion unit, and a second rectification unit;
the input end of the inversion unit is connected with the output end of the rectification module, the output end of the inversion unit is connected with the primary winding of the transformer, the input end of the second rectification unit is connected with the secondary winding of the transformer, and the output end of the second rectification unit is connected with the input end of the inversion module;
the inverter unit is right the first direct current carries out voltage inversion and outputs first high frequency alternating current, the transformer is right the first high frequency alternating current carries out voltage transformation and outputs second high frequency alternating current, the second rectifier unit is right the second high frequency alternating current carries out voltage inversion and outputs after the steady voltage the second direct current.
In one embodiment, the inverter unit comprises a seventh switching tube, an eighth switching tube, a ninth switching tube and a tenth switching tube;
the high potential end of the seventh switching tube is connected with the high potential end of the eighth switching tube, the low potential end of the seventh switching tube is connected with the high potential end of the ninth switching tube in a shared manner and is connected with one end of the primary winding of the transformer, the low potential end of the eighth switching tube is connected with the high potential end of the tenth switching tube in a shared manner and is connected with the other end of the primary winding of the transformer, and the low potential end of the ninth switching tube is connected with the low potential end of the tenth switching tube.
In one embodiment, the second rectifying unit comprises an eleventh switching tube, a twelfth switching tube, a thirteenth switching tube, a fourteenth switching tube and a second capacitor;
the high potential end of the eleventh switching tube, the high potential end of the twelfth switching tube and the first end of the second capacitor are connected in common, the low potential end of the eleventh switching tube and the high potential end of the thirteenth switching tube are connected in common and are connected with one end of the secondary winding of the transformer, the low potential end of the twelfth switching tube and the high potential end of the fourteenth switching tube are connected in common and are connected with the other end of the secondary winding of the transformer, and the low potential end of the thirteenth switching tube, the low potential end of the fourteenth switching tube and the second end of the second capacitor are connected in common.
In one embodiment, the inverter module comprises a fifteenth switching tube, a sixteenth switching tube, a seventeenth switching tube, an eighteenth switching tube, a nineteenth switching tube, a twentieth switching tube, a twenty-first switching tube and a twenty-second switching tube;
a high potential end of the fifteenth switching tube, a high potential end of the sixteenth switching tube, a high potential end of the seventeenth switching tube and a high potential end of the eighteenth switching tube are connected in common, a low potential end of the nineteenth switching tube, a low potential end of the twentieth switching tube, a low potential end of the twenty-first switching tube and a low potential end of the twenty-second switching tube are connected in common, a low potential end of the fifteenth switching tube is connected with a high potential end of the nineteenth switching tube, a low potential end of the sixteenth switching tube is connected with a high potential end of the twentieth switching tube, a low potential end of the seventeenth switching tube is connected with a high potential end of the twenty-first switching tube, a low potential end of the eighteenth switching tube is connected with a high potential end of the twenty-second switching tube, a low potential end of the fifteenth switching tube, a low potential end of the sixteenth switching tube, a high potential end of the seventeenth switching, And the low potential end of the seventeenth switching tube and the low potential end of the eighteenth switching tube jointly output the three-phase alternating current.
In one embodiment, the control module comprises a signal acquisition unit, a control unit and a driving unit;
the output end of the signal acquisition unit is connected with the input end of the control unit, the output end of the control unit is connected with the input end of the driving unit, and the output end of the driving unit is connected with the rectification module, the isolation module and the inversion module;
the signal acquisition unit processes and transmits voltage and current signals of the rectification module, the isolation module and the inversion module to the control unit, the control unit outputs PWM (pulse-width modulation) waves corresponding to the voltage and current signals to the driving unit, and the driving unit outputs the stabilized PWM waves to the rectification module, the isolation module and the inversion module so as to complete control of the whole circuit and adjust the frequency and amplitude of the three-phase alternating current.
Compared with the prior art, the embodiment of the invention has the following beneficial effects: the invention not only has the functions of voltage transformation, isolation, energy transfer and the like, but also can realize voltage transformation and frequency conversion control by adopting a corresponding control strategy through the control module according to the load working requirement, and can well adapt to various working requirements.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a three-phase power electronic transformer according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a three-phase power electronic transformer according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a control module according to an embodiment of the present invention.
Detailed Description
In order to make the technical solution better understood by those skilled in the art, the technical solution in the embodiment of the present invention will be clearly described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is a part of the embodiment of the present invention, and not a whole embodiment. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present disclosure without any creative effort shall fall within the protection scope of the present disclosure.
The terms "include" and any other variations in the description and claims of this document and the above-described figures, mean "including but not limited to", and are intended to cover non-exclusive inclusions. Furthermore, the terms "first" and "second," etc. are used to distinguish between different objects and are not used to describe a particular order.
Implementations of the present invention are described in detail below with reference to the following detailed drawings:
fig. 1 shows a structure of a three-phase power electronic transformer according to an embodiment of the present invention, and for convenience of description, only the parts related to the embodiment of the present invention are shown, and detailed descriptions are as follows:
as shown in fig. 1, a three-phase power electronic transformer circuit 1 according to an embodiment of the present invention includes a rectifying module 100, an isolating module 200, an inverting module 300, and a control module 400.
The rectifier module 100 is connected with three-phase power, the rectifier module 100 is connected with the isolation module 200, the isolation module 200 is connected with the inverter module 300, the inverter module 300 outputs three-phase alternating current, and the control module 400 is respectively connected with the rectifier module 100, the isolation module 200 and the inverter module 300.
The control module 400 controls the rectification module 100 to rectify three-phase power in the power grid to generate a first direct current, and outputs the first direct current to the isolation module 200, the control module 400 controls the isolation module 200 to isolate the first direct current to generate a second direct current, and outputs the second direct current to the inversion module 300, and the control module 400 controls the inversion module 300 to invert the second direct current to output the required three-phase alternating current.
In the embodiment of the invention, the three-phase power electronic transformer circuit 1 adopts a three-level topological structure, has good control characteristics, has the functions of voltage transformation, isolation, energy transfer and the like, can also realize voltage transformation and frequency conversion control by adopting a corresponding control strategy through the control module 400 according to the load working requirements, and can well adapt to various working requirements.
In one embodiment of the invention, the control module 400 is a DSP and FPGA based dual CPU control system.
As shown in fig. 2, in one embodiment of the present invention, the rectifying module 100 includes a first rectifying unit 110 and a first voltage stabilizing unit 120; the first rectifying unit 110 is connected to three-phase power, and the first rectifying unit 110 is connected to the first voltage stabilizing unit 120.
The first rectifying unit 110 rectifies three-phase power in the power grid to generate a first direct current, outputs the first direct current to the first voltage stabilizing unit 120, and the first voltage stabilizing unit 120 stabilizes the voltage of the first direct current and outputs the stabilized first direct current to the isolating module 200.
As shown in fig. 2, in one embodiment of the present invention, the first rectifying unit 110 includes a first switching tube Q1, a second switching tube Q2, a third switching tube Q3, a fourth switching tube Q4, a fifth switching tube Q5 and a sixth switching tube Q6.
A high potential end of the first switching tube Q1, a high potential end of the second switching tube Q2 and a high potential end of the third switching tube Q3 are connected, a low potential end of the first switching tube Q1 is connected with a high potential end of the fourth switching tube Q4, a low potential end of the second switching tube Q2 is connected with a high potential end of the fifth switching tube Q5, a low potential end of the third switching tube Q3 is connected with a high potential end of the sixth switching tube Q6, a low potential end of the fourth switching tube Q4, a low potential end of the fifth switching tube Q5 and a low potential end of the sixth switching tube Q6 are connected, and a low potential end of the first switching tube Q1, a low potential end of the second switching tube Q2 and a low potential end of the third switching tube Q3 are respectively connected to three phases.
In this embodiment, the first rectifying unit 110 adopts a first switching tube Q1, a second switching tube Q2, a third switching tube Q3, a fourth switching tube Q4, a fifth switching tube Q5 and a sixth switching tube Q6 to form a rectifying bridge with a three-phase bridge topology, the first switching tube Q1, the second switching tube Q2, the third switching tube Q3, the fourth switching tube Q4, the fifth switching tube Q5 and the sixth switching tube Q6 are 6 high-voltage high-power switching devices, which may be IGBT tubes, the high-potential end of each switching tube is a drain electrode of the IGBT tube, and the low-potential end of each switching tube is a source electrode of the IGBT tube.
In the present embodiment, the control module 400 controls the first rectifying unit 110 to convert three-phase power into a first direct current power by controlling the connection or disconnection of the first switching tube Q1, the second switching tube Q2, the third switching tube Q3, the fourth switching tube Q4, the fifth switching tube Q5 and the sixth switching tube Q6.
As shown in fig. 2, in one embodiment of the present invention, the first voltage stabilization unit 120 includes a first capacitor C1.
A first end of the first capacitor C1 is connected in common with a high potential end of the first switching tube Q1, a high potential end of the second switching tube Q2 and a high potential end of the third switching tube Q3, and a second end of the first capacitor C1 is connected in common with a low potential end of the fourth switching tube Q4, a low potential end of the fifth switching tube Q5 and a low potential end of the sixth switching tube Q6.
In the present embodiment, the first capacitor C1 functions as a voltage regulator.
As shown in fig. 2, in one embodiment of the present invention, the isolation module 200 includes a transformer 220, an inverting unit 210, and a second rectifying unit 230.
The input end of the inverting unit 210 is connected to the output end of the rectifying module 100, the output end of the inverting unit 210 is connected to the primary winding of the transformer 220, the input end of the second rectifying unit 230 is connected to the secondary winding of the transformer 220, and the output end of the second rectifying unit 230 is connected to the input end of the inverting module 300.
The inverting unit 210 performs voltage inversion on the first direct current to output a first high-frequency alternating current, the transformer 220 performs voltage transformation on the first high-frequency alternating current to output a second high-frequency alternating current, and the second rectifying unit 230 performs voltage inversion on the second high-frequency alternating current and outputs a second direct current after voltage stabilization.
In the present embodiment, the transformer 220 is a high frequency transformer and is a single-phase double-winding transformer. The inverter unit 210 functions as high frequency DC/AC, and the second rectification unit 230 functions as high frequency AC/DC. The inverter unit 210 modulates the input first direct current into a first high-frequency alternating current voltage, supplies the first high-frequency alternating current voltage to the transformer 220, transforms the voltage through the transformer 220, wherein the transformation ratio of the transformer 200 is determined by the voltage grade requirement of a specific application occasion, realizes the isolation, transformation and energy transfer of the first high-frequency alternating current voltage, outputs a second high-frequency alternating current voltage, and the second rectifier unit 230 modulates the second high-frequency alternating current voltage into a second direct current.
As shown in fig. 2, in an embodiment of the present invention, the inverter unit 210 includes a seventh switching tube Q7, an eighth switching tube Q8, a ninth switching tube Q9 and a tenth switching tube Q10.
The high potential end of the seventh switching tube Q7 is connected with the high potential end of the eighth switching tube Q8, the low potential end of the seventh switching tube Q7 is connected with the high potential end of the ninth switching tube Q9 in common and is connected with one end of the primary winding of the transformer, the low potential end of the eighth switching tube Q8 is connected with the high potential end of the tenth switching tube Q10 in common and is connected with the other end of the primary winding of the transformer, and the low potential end of the ninth switching tube Q9 is connected with the low potential end of the tenth switching tube Q10.
In this embodiment, the seventh switch Q7, the eighth switch Q8, the ninth switch Q9 and the tenth switch Q10 may be IGBT transistors, the high potential end of the switch transistor is the drain of the IGBT transistor, and the low potential end of the switch transistor is the source of the IGBT transistor.
As shown in fig. 2, in an embodiment of the present invention, the second rectification unit 230 includes an eleventh switching tube Q11, a twelfth switching tube Q12, a thirteenth switching tube Q13, a fourteenth switching tube Q14, and a second capacitor C2.
The high potential end of an eleventh switching tube Q11, the high potential end of a twelfth switching tube Q12 and the first end of a second capacitor C2 are connected in common, the low potential end of the eleventh switching tube Q11 is connected with the high potential end of a thirteenth switching tube Q13 in common and is connected with one end of the secondary winding of the transformer, the low potential end of a twelfth switching tube Q12 is connected with the high potential end of a fourteenth switching tube Q14 in common and is connected with the other end of the secondary winding of the transformer, and the low potential end of the thirteenth switching tube Q13, the low potential end of the fourteenth switching tube Q14 and the second end of the second capacitor C2 in common.
In this embodiment, the eleventh switch tube Q11, the twelfth switch tube Q12, the thirteenth switch tube Q13 and the fourteenth switch tube Q14 may be IGBT tubes, the high potential end of the switch tube is the drain of the IGBT tube, and the low potential end of the switch tube is the source of the IGBT tube.
In the present embodiment, the second capacitor C2 functions to stabilize the voltage.
As shown in fig. 2, in an embodiment of the present invention, the inverter module 300 includes a fifteenth switching tube Q15, a sixteenth switching tube Q16, a seventeenth switching tube Q17, an eighteenth switching tube Q18, a nineteenth switching tube Q19, a twentieth switching tube Q20, a twenty-first switching tube Q21, and a twenty-second switching tube Q22.
The high potential end of a fifteenth switching tube Q15, the high potential end of a sixteenth switching tube Q16, the high potential end of a seventeenth switching tube Q17 and the high potential end of an eighteenth switching tube Q18 are connected in common and are connected with the first end of a second capacitor C2, the low potential end of a nineteenth switching tube Q19, the low potential end of a twentieth switching tube Q20, the low potential end of a twenty-first switching tube Q21 and the low potential end of a twenty-second switching tube Q22 are connected in common and are connected with the second end of a second capacitor C2, the low potential end of a fifteenth switching tube Q15 is connected with the high potential end of a nineteenth switching tube Q19, the low potential end of a sixteenth switching tube Q16 is connected with the high potential end of a twentieth switching tube Q20, the low potential end of a seventeenth switching tube Q17 is connected with the high potential end of a twenty-first switching tube Q8, the eighteenth switching tube Q18 is connected with the low potential end of a twentieth switching tube Q92, and the low potential end of a fifteenth switching tube Q638 is connected with the high potential end of, The low-potential end of the sixteenth switching tube Q16, the low-potential end of the seventeenth switching tube Q17 and the low-potential end of the eighteenth switching tube Q18 output the three-phase alternating current together.
In this embodiment, the fifteenth switching tube Q15, the sixteenth switching tube Q16, the seventeenth switching tube Q17, the eighteenth switching tube Q18, the nineteenth switching tube Q19, the twentieth switching tube Q20, the twenty-first switching tube Q21 and the twenty-second switching tube Q22 may all be IGBT tubes, a high potential end of each switching tube is a drain electrode of the IGBT tube, and a low potential end of each switching tube is a source electrode of the IGBT tube.
In this embodiment, a fifteenth switching tube Q15, a sixteenth switching tube Q16, a seventeenth switching tube Q17, an eighteenth switching tube Q18, a nineteenth switching tube Q19, a twentieth switching tube Q20, a twenty-first switching tube Q21 and a twenty-second switching tube Q22 form a three-phase four-wire bridge topology converter, and according to the working requirement of a load, based on a DSP and FPGA dual-CPU control system, a corresponding control strategy is used to provide an ideal voltage source function and a frequency conversion control function.
As shown in fig. 3, in one embodiment of the present invention, the control module 400 includes a signal acquisition unit 410, a control unit 420, and a driving unit 430.
The output end of the signal acquisition unit 410 is connected with the input end of the control unit 420, the output end of the control unit 420 is connected with the input end of the driving unit 430, and the output end of the driving unit 430 is connected with the rectification module 100, the isolation module 200 and the inversion module 300.
The signal acquisition unit 410 processes and transmits voltage and current signals of the rectification module 100, the isolation module 200 and the inversion module 300 to the control unit 420, the control unit 420 outputs PWM modulation waves corresponding to the voltage and current signals to the driving unit 430, and the driving unit 430 outputs the stabilized PWM modulation waves to the rectification module 100, the isolation module 200 and the inversion module 300 so as to adjust the frequency and amplitude of the three-phase alternating current.
In the present embodiment, the signal collecting unit 410 collects three-phase input voltage and current, output voltage and current of a three-phase bridge of the rectifier module 100, and input current of the first capacitor C1 in the first voltage stabilizing unit 120; the signal collecting unit 410 collects the input current of the isolation module 200, i.e. the input current of the inverter unit 210, and also collects the voltage and current at the two ends of the transformer 220 and the output current of the H-bridge in the second rectifying unit 230; the signal collecting unit 410 collects input voltage and input current of the three-phase four-leg structure in the inverter module 300, and output voltage and output current of the inverter output terminal thereof.
In specific application, when the transformer is used as a transformer, based on a DSP and FPGA dual-CPU control system, a dual-closed-loop control strategy is adopted to calculate a PWM pulse signal to drive the inversion module 300, and the second direct current provided by the isolation module 200 is inverted into a three-phase alternating current voltage, so that an ideal voltage is provided for a load.
In specific application, when the frequency converter is used as a frequency converter, according to the frequency conversion requirement required by a load, a voltage space vector method is adopted to calculate a PWM pulse signal to drive the inverter module 300, and the second direct current provided by the isolation module 200 is inverted into a three-phase alternating current voltage with variable frequency and voltage required by the load, so that the frequency conversion function is realized.
In an embodiment of the present invention, the control module 400 further includes a comparing unit and a protecting unit, an input end of the comparing unit is connected to the signal output end of the signal collecting unit, an output end of the comparing unit is connected to a receiving end of the control unit, and an input end of the protecting unit is connected to the control signal output end of the control unit.
In this embodiment, the protection unit is a switch group arranged at a three-phase power access point in a power grid, voltage and current signals of the rectification module, the isolation module and the inversion module collected by the signal collection unit are transmitted to the comparison unit, the comparison unit compares the voltage and current signals with preset voltage and current value ranges, when the voltage and current values exceed the preset voltage and current value ranges, the comparison unit transmits comparison result signals to the control unit, and the control unit controls the protection unit to be disconnected, so that the input of three-phase power is disconnected.
In one embodiment of the present invention, the signal acquisition unit 410 comprises a sensor subunit and a first FPGA control subunit.
The input end of the sensor subunit is the input end of the signal acquisition unit, the output end of the sensor subunit is connected with the input end of the first FPGA control subunit, and the output end of the first FPGA control subunit is the output end of the signal acquisition unit.
The sensor unit transmits voltage and current signals of the acquisition rectification module, the isolation module and the inversion module to the first FPGA control subunit, the first FPGA control subunit filters the voltage and current signals and transmits the processed voltage and current signals to the control unit.
In one embodiment of the invention, the control unit 420 comprises a DSP processing subunit and a second FPGA control subunit.
The input end of the DSP processing subunit is the input end of the control unit, the output end of the DSP processing subunit is connected with the input end of the second FPGA control subunit, and the output end of the second FPGA control subunit is the output end of the control unit.
The DSP processing subunit receives the voltage and current signals of the signal acquisition unit and a preset direct current voltage value, adjusts the voltage and current signals through the voltage outer ring PI adjuster and the current inner ring PR adjuster to obtain different duty ratios, transmits the duty ratios to the second FPGA control subunit, obtains PWM signals of the rectifier module through the processing of the second FPGA control subunit, and transmits the PWM signals of the rectifier module to the driving unit.
The second FPGA control subunit controls the size and the direction of the transmission power of the three-phase power electronic transformer by controlling the on-off of a switch tube in the isolation module by using a double phase-shifting control algorithm, generates a corresponding PWM signal of the isolation module and transmits the PWM signal of the isolation module to the driving unit.
For the inverter module:
1) if a three-phase power electronic transformer is required to be in a transformer state: the DSP processing subunit obtains the duty ratio of an inverter stage H bridge by adopting a voltage and current double closed loop PI controller according to the voltage and current signals of the inverter module collected by the signal collecting unit, sends the duty ratio into an FPGA chip in the core board, generates PWM signals of the inverter module and transmits the PWM signals of the inverter module to the driving unit.
2) If the three-phase power electronic transformer is required to be in a frequency converter state: the DSP processing subunit obtains current and voltage components under a two-phase static coordinate system after three-phase to two-phase conversion according to the three-phase stator current and the stator voltage of the induction motor acquired by the signal acquisition unit, and inputs the current and voltage components under the two-phase static coordinate system into the flux linkage observer. The amplitude and the magnetic field orientation angle of the rotor flux linkage and the actual torque value are obtained through a flux linkage observer. The DSP processing subunit subtracts the acquired motor speed signal from the given speed signal, obtains an ideal torque value by adjusting the difference value through a rotating speed PI, obtains a torque voltage component by adjusting the difference value of the ideal torque value and the actual torque value through a T-axis current PI adjuster, and obtains an excitation transformation component by adjusting the difference value through an M-axis current PI. And the torque voltage component and the excitation transformation component are subjected to park inverse transformation to obtain a voltage component under a two-phase static coordinate system, and the voltage component is sent to the second FPGA control subunit. And the second FPGA control subunit obtains a PWM signal of the inversion module by using an SVPWM (space vector pulse width modulation) algorithm, and the driving unit drives the inversion module to output three-phase alternating-current voltage with variable frequency and voltage according to the PWM signal.
In one embodiment of the present invention, the driving unit 430 includes a third FPGA control subunit and a transistor driving subunit.
The input end of the third FPGA control subunit is the input end of the driving unit, the output end of the third FPGA control subunit is connected with the input end of the transistor driving subunit, and the output end of the transistor driving subunit is the output end of the driving unit.
And the third FPGA control subunit receives the PWM signal of the control unit, and transmits the processed PWM signal to the transistor driving subunit after signal conditioning, and the transistor driving subunit drives the rectifying module, the isolating module and the inverting module to work.
It should be noted that the ports or pins with the same numbers in the description of the present invention and the drawings are connected.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (8)

1. A three-phase power electronic transformer is characterized by comprising a rectification module, an isolation module, an inversion module and a control module;
the rectifier module is connected with three-phase power, the rectifier module is connected with the isolation module, the isolation module is connected with the inverter module, the inverter module outputs three-phase alternating current, and the control module is respectively connected with the rectifier module, the isolation module and the inverter module;
the control module controls the rectification module to rectify three-phase power in a power grid to generate a first direct current and output the first direct current to the isolation module, the control module controls the isolation module to isolate the first direct current to generate a second direct current and output the second direct current to the inversion module, and the control module controls the inversion module to invert the second direct current to output the required three-phase alternating current;
the control module comprises a signal acquisition unit, a control unit and a driving unit, the output end of the signal acquisition unit is connected with the input end of the control unit, the output end of the control unit is connected with the input end of the driving unit, the output end of the driving unit is connected with the rectifying module, the isolating module and the inverting module, the signal acquisition unit processes and transmits voltage and current signals of the rectification module, the isolation module and the inversion module to the control unit, the control unit outputs a PWM modulation wave corresponding to the voltage and current signals to the driving unit, the driving unit outputs the stabilized PWM modulation wave to the rectification module, the isolation module and the inversion module so as to complete the control of the whole circuit and adjust the frequency and amplitude of the three-phase alternating current;
the control module is a dual-CPU control system based on a DSP and an FPGA;
when the three-phase power electronic transformer is used as a frequency converter, the DSP and FPGA dual-CPU control system calculates a PWM pulse signal by adopting a voltage space vector method to drive the inversion module, and inverts the second direct current provided by the isolation module into a three-phase alternating current voltage with variable frequency and voltage required by a load, so that the frequency conversion function is realized.
2. A three-phase power electronic transformer according to claim 1, wherein the rectifying module comprises a first rectifying unit and a first voltage stabilizing unit;
the first rectifying unit is connected with the three-phase power and is connected with the first voltage stabilizing unit;
the first rectification unit is to the electric wire netting three-phase electricity carry out the rectification and generate first direct current exports first steady voltage unit, first steady voltage unit is right first direct current carries out steady voltage and handles to after with the steady voltage first direct current exports to isolation module.
3. The three-phase power electronic transformer of claim 2, wherein the first rectifying unit comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube and a sixth switching tube;
the high potential end of the first switch tube, the high potential end of the second switch tube and the high potential end of the third switch tube are connected, the low potential end of the first switch tube is connected with the high potential end of the fourth switch tube, the low potential end of the second switch tube is connected with the high potential end of the fifth switch tube, the low potential end of the third switch tube is connected with the high potential end of the sixth switch tube, the low potential end of the fourth switch tube, the low potential end of the fifth switch tube and the low potential end of the sixth switch tube are connected, and the low potential end of the first switch tube, the low potential end of the second switch tube and the low potential end of the third switch tube are connected with three-phase power.
4. A three-phase power electronic transformer according to claim 3, wherein the first voltage regulation unit comprises a first capacitor;
the first end of the first capacitor is connected with the high potential end of the first switch tube, the high potential end of the second switch tube and the high potential end of the third switch tube in a sharing mode, and the second end of the first capacitor is connected with the low potential end of the fourth switch tube, the low potential end of the fifth switch tube and the low potential end of the sixth switch tube in a sharing mode.
5. The three-phase power electronic transformer of claim 1, wherein the isolation module comprises a transformer, an inverter unit, and a second rectification unit;
the input end of the inversion unit is connected with the output end of the rectification module, the output end of the inversion unit is connected with the primary winding of the transformer, the input end of the second rectification unit is connected with the secondary winding of the transformer, and the output end of the second rectification unit is connected with the input end of the inversion module;
the inverter unit is right the first direct current carries out voltage inversion and outputs first high frequency alternating current, the transformer is right the first high frequency alternating current carries out voltage transformation and outputs second high frequency alternating current, the second rectifier unit is right the second high frequency alternating current carries out voltage inversion and outputs after the steady voltage the second direct current.
6. The three-phase power electronic transformer of claim 5, wherein the inverter unit comprises a seventh switching tube, an eighth switching tube, a ninth switching tube and a tenth switching tube;
the high potential end of the seventh switching tube is connected with the high potential end of the eighth switching tube, the low potential end of the seventh switching tube is connected with the high potential end of the ninth switching tube in a shared manner and is connected with one end of the primary winding of the transformer, the low potential end of the eighth switching tube is connected with the high potential end of the tenth switching tube in a shared manner and is connected with the other end of the primary winding of the transformer, and the low potential end of the ninth switching tube is connected with the low potential end of the tenth switching tube.
7. The three-phase power electronic transformer of claim 5, wherein the second rectifying unit comprises an eleventh switching tube, a twelfth switching tube, a thirteenth switching tube, a fourteenth switching tube and a second capacitor;
the high potential end of the eleventh switching tube, the high potential end of the twelfth switching tube and the first end of the second capacitor are connected in common, the low potential end of the eleventh switching tube and the high potential end of the thirteenth switching tube are connected in common and are connected with one end of the secondary winding of the transformer, the low potential end of the twelfth switching tube and the high potential end of the fourteenth switching tube are connected in common and are connected with the other end of the secondary winding of the transformer, and the low potential end of the thirteenth switching tube, the low potential end of the fourteenth switching tube and the second end of the second capacitor are connected in common.
8. The three-phase power electronic transformer of claim 1, wherein the inverter module comprises a fifteenth switching tube, a sixteenth switching tube, a seventeenth switching tube, an eighteenth switching tube, a nineteenth switching tube, a twentieth switching tube, a twenty-first switching tube and a twenty-second switching tube;
a high potential end of the fifteenth switching tube, a high potential end of the sixteenth switching tube, a high potential end of the seventeenth switching tube and a high potential end of the eighteenth switching tube are connected in common, a low potential end of the nineteenth switching tube, a low potential end of the twentieth switching tube, a low potential end of the twenty-first switching tube and a low potential end of the twenty-second switching tube are connected in common, a low potential end of the fifteenth switching tube is connected with a high potential end of the nineteenth switching tube, a low potential end of the sixteenth switching tube is connected with a high potential end of the twentieth switching tube, a low potential end of the seventeenth switching tube is connected with a high potential end of the twenty-first switching tube, a low potential end of the eighteenth switching tube is connected with a high potential end of the twenty-second switching tube, a low potential end of the fifteenth switching tube, a low potential end of the sixteenth switching tube, a high potential end of the seventeenth switching, And the low potential end of the seventeenth switching tube and the low potential end of the eighteenth switching tube jointly output the three-phase alternating current.
CN201811376618.2A 2018-11-19 2018-11-19 Three-phase power electronic transformer Active CN109149957B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811376618.2A CN109149957B (en) 2018-11-19 2018-11-19 Three-phase power electronic transformer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811376618.2A CN109149957B (en) 2018-11-19 2018-11-19 Three-phase power electronic transformer

Publications (2)

Publication Number Publication Date
CN109149957A CN109149957A (en) 2019-01-04
CN109149957B true CN109149957B (en) 2020-09-08

Family

ID=64806062

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811376618.2A Active CN109149957B (en) 2018-11-19 2018-11-19 Three-phase power electronic transformer

Country Status (1)

Country Link
CN (1) CN109149957B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111697836A (en) * 2020-05-07 2020-09-22 南京南瑞继保电气有限公司 Single-phase power electronic transformer and control method thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN204013276U (en) * 2013-11-11 2014-12-10 国家电网公司 A kind of based on numerically controlled bidirectional energy-storage current transformer hardware system
CN108123611A (en) * 2016-11-29 2018-06-05 张喜军 A kind of SVPWM solid-state transformers applied to intelligent micro-grid

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI422136B (en) * 2010-10-08 2014-01-01 Ind Tech Res Inst Circuit module for dc-ac converter adapted solar power ac units
CN102420561B (en) * 2011-12-01 2013-07-10 国电南京自动化股份有限公司 Speed sensorless vector control method on basis of cascaded high voltage inverter
CN209250500U (en) * 2018-11-19 2019-08-13 河北工程大学 A kind of three-phase power electronic transformer

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN204013276U (en) * 2013-11-11 2014-12-10 国家电网公司 A kind of based on numerically controlled bidirectional energy-storage current transformer hardware system
CN108123611A (en) * 2016-11-29 2018-06-05 张喜军 A kind of SVPWM solid-state transformers applied to intelligent micro-grid

Also Published As

Publication number Publication date
CN109149957A (en) 2019-01-04

Similar Documents

Publication Publication Date Title
US8243481B2 (en) Power transformer and power converter incorporating same
Singh et al. Harmonic mitigation using 12-pulse AC-DC converter in vector-controlled induction motor drives
EP2270968B1 (en) Power Transmission Method and Power Transmission Apparatus
US10953751B2 (en) Vehicle-side power circuit for supplying power in an electrically driven vehicle
JP2022552374A (en) Multi-output multi-bridge power converter
EP1564875A1 (en) Filter
US8339820B2 (en) Thirty-six pulse power transformer and power converter incorporating same
US6831442B2 (en) Utilizing zero-sequence switchings for reversible converters
US11738653B2 (en) Integrated charger and motor control system isolated by motor
EP3337024B1 (en) Bidirectional resonant conversion circuit and converter
CN113412566A (en) Integrated charging and motor control system including a transformer and a multilevel power converter
WO2007069556A1 (en) High-frequency modulation/demodulation multiphase rectifying device
CN112368897A (en) Device for coupling an electrical network
US20180269726A1 (en) Inductive Power Transmitter
CN109149957B (en) Three-phase power electronic transformer
Krishnamoorthy et al. New medium-voltage adjustable speed drive (ASD) topologies with medium-frequency transformer isolation
Langmaack et al. Transformerless onboard charger for electric vehicles with 800 V power system
Tripathi et al. Torque ripple minimization in neutral-point-clamped three-level inverter fed induction motor drives operated at low-switching-frequency
CN115549462A (en) Power module and related equipment
EP3742596B1 (en) Power converter
Milan et al. A novel SPWM strategy for single-to three-phase matrix converter
CN209250500U (en) A kind of three-phase power electronic transformer
CN110326204B (en) Method for controlling a three-phase rectifier of a charging device on board an electric or hybrid vehicle
Roy et al. Design and analysis of the power electronic transformer for power quality improvement
EP3915188A1 (en) Motor drive topologies for traction and charging in electrified vehicles

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant