CN109687730A - A kind of electric power electric transformer system and its control method - Google Patents
A kind of electric power electric transformer system and its control method Download PDFInfo
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- CN109687730A CN109687730A CN201811606155.4A CN201811606155A CN109687730A CN 109687730 A CN109687730 A CN 109687730A CN 201811606155 A CN201811606155 A CN 201811606155A CN 109687730 A CN109687730 A CN 109687730A
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- driving signal
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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
- 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
- H02M7/2173—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 biphase or polyphase circuit arrangement
-
- 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
- H02M3/285—Single converters with a plurality of output stages connected in parallel
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- 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
- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a kind of electric power electric transformer system and its control methods, it include: the alternate voltage changing module of A phase, the alternate voltage changing module of B phase, the alternate voltage changing module of C phase, it is characterized by: each alternate voltage changing module includes: multiple power conversion modules, output voltage instruction value Uout_ref and actual output voltage Uout passes through pi regulator, load R is obtained after subtracting each other with Uout_ref/Iout, the DC bus-bar voltage Udcn (t) of H-bridge unit obtains input current Iin divided by load R, and Iin is multiplied to obtain power P (t) with Udcn (t)；The power P (t) that will be calculated substitutes into formula and acquires DAB resonance frequency fs (t).The present invention reduces DC bus side and output lateral capacitance, reduces volume and cost, while reducing control difficulty.
Description
Technical field
The present invention relates to a kind of electric power electric transformer system and its control methods, belong to power electronics field.
Background technique
With the development of power electronics technology, electric power electric transformer will replace traditional transformer, and power electronics becomes at present
Depressor mostly uses cascade form, and each unit module DC bus and DC output side parallel filtering capacitor carry out burning voltage, filter
Except the voltage fluctuation of 2 frequencys multiplication, this form not only increases the volume of whole system, while to control each capacitance voltage, increases
The control difficulty of system.
A kind of electric power electric transformer system and its control method proposed by the present invention reduce DC bus and direct current output
The capacitor of side is reducing cost, simplifies the control difficulty of whole system while reducing volume.
Summary of the invention
Purpose: in order to overcome the deficiencies in the prior art, the present invention provide a kind of electric power electric transformer system and
Its control method.
Technical solution: in order to solve the above technical problems, the technical solution adopted by the present invention are as follows:
A kind of electric power electric transformer system, comprising: the alternate voltage changing module of A phase, the alternate voltage changing module of B phase, the alternate change of C phase
Die block, each alternate voltage changing module include: multiple power conversion modules, the power conversion modules include: alternating current inlet wire end,
Exchange leading-out terminal, direct current output anode, direct current output negative terminal；Multiple power conversion modules in the alternate voltage changing module of the A phase
Alternating current inlet wire end with exchange leading-out terminal and successively connect downwards, the direct current output anode of multiple power conversion modules with straight line mother
Line anode is connected, and the direct current output negative terminal of multiple power conversion modules is connected with rectilinear generatrix negative terminal；The B phase is alternate
The alternating current inlet wire end of multiple power conversion modules in voltage changing module with exchange leading-out terminal and successively connect downwards, multiple power conversions
The direct current output anode of module is connected with rectilinear generatrix anode, and the direct current output negative terminal of multiple power conversion modules is and directly
Line bus negative terminal is connected；The alternating current inlet wire end of multiple power conversion modules in the alternate voltage changing module of the C phase with exchange out
Line end is successively connected downwards, and the direct current output anode of multiple power conversion modules is connected with rectilinear generatrix anode, Duo Gegong
The direct current output negative terminal of rate conversion module is connected with rectilinear generatrix negative terminal；First in the alternate voltage changing module of the A phase
The alternating current inlet wire end of power conversion modules is connected with A phase ac bus；First power in the alternate voltage changing module of the B phase
The alternating current inlet wire end of conversion module is connected with B phase ac bus；First power conversion in the alternate voltage changing module of the C phase
The alternating current inlet wire end of module is connected with C phase ac bus；A most power conversion modules in the alternate voltage changing module of the A phase
Exchange leading-out terminal voltage changing module alternate with B phase in most power conversion modules exchange the alternate transformation mould of leading-out terminal, C phase
The exchange leading-out terminal of most one power conversion modules in block is connected.
Preferably, the power conversion modules 2 include: H-bridge unit, DAB resonance circuit, the H-bridge unit with
DAB resonance circuit is connected by first capacitor C1, and the H-bridge unit input terminal is alternating current inlet wire end, exchange leading-out terminal, DAB
Resonance circuit output end is direct current output anode, direct current output negative terminal, between the direct current output anode and direct current output negative terminal
It is provided with the second capacitor C2；The alternating current inlet wire end of the H-bridge unit is set as voltage UAC (t) with voltage between leading-out terminal is exchanged,
H-bridge unit output end voltage is set as Udcn (t), and the switching frequency of DAB resonance circuit is set as fs (t), DAB resonance circuit
Voltage is set as voltage Uout, the change on the former secondary side of the voltage device of DAB resonance circuit between direct current output anode, direct current output negative terminal
Than for n, it is Iout that power conversion modules, which export electric current, and power conversion modules output power is p (t), the first capacitor C1, the
For two capacitor C2 for filtering out higher hamonic wave, the voltage device primary side is provided with inductance L.
Preferably, it connects after control switch R1, R2, R3, R4 in the H-bridge unit, R1, R2 series connection with R3, R4
Branch is in parallel；Control switch P1, P2, P3, P4 of the DAB resonance circuit primary side, branch of connecting after P1, P2 series connection with P3, P4
Road is in parallel；After control switch S1, S2, S3, the S4 on the DAB resonance circuit pair side, S1, S2 series connection with S3, S4 series arm
It is in parallel.
Preferably, IGBT or MOSFET can be used in described control switch R1, R2, R3, R4.
Preferably, IGBT or MOSFET can be used in described control switch P1, P2, P3, P4.
Preferably, IGBT or MOSFET can be used in described control switch S1, S2, S3, S4.
A kind of control method of electric power electric transformer system, characterized by the following steps:
Step 1:H bridge unit rectifies input voltage UAC (t), as input voltage UAC > 0, R1 and R4 conducting, when
When input voltage UAC < 0, R3 and R2 conducting, equal output voltage Udcn (t), the voltage fluctuation containing 2 frequencys multiplication；
Step 2: as Udcn < nUout, the driving signal that control switch P1 and P2 is arranged is complementary, control switch P3 and P4
Driving signal it is complementary, the driving signal of control switch P1 and P3 are complementary；The driving signal that control switch S1 and S2 is arranged is complementary,
The driving signal of control switch S3 and S4 are complementary, and the driving signal time that the advanced S1 of driving signal of control switch S3 is arranged is g
(t), the control switch S1 driving signal lag P1 driving signal time is w (t), in which:
DAB resonance frequency is calculated by formula (2)；
Step 3: as Udcn > nUout, the driving signal that control switch P1 and P2 is arranged is complementary, control switch P3 and P4
Driving signal it is complementary, the driving signal that control switch S1 and S2 is arranged is complementary, and the driving signal of control switch S3 and S4 are complementary,
The driving signal of control switch S1 and S3 are complementary, and the setting control switch P1 driving signal advanced S1 driving signal time is g (t),
P1 driving signal lags the P3 driving signal time as v (t), in which:
DAB resonance frequency is calculated by formula (4)；
Step 4: output voltage instruction value Uout_ref and actual output voltage Uout passes through pi regulator, with Uout_
Ref/Iout obtains load R after subtracting each other, the DC bus-bar voltage Udcn (t) of H-bridge unit obtains input current Iin divided by load R,
Iin is multiplied to obtain power P (t) with Udcn (t)；
Step 5: the power P (t) that will be calculated substitutes into formula (2) respectively or formula (4) acquires DAB resonance frequency fs
(t)。
The utility model has the advantages that a kind of electric power electric transformer system provided by the invention and its control method, reduce DC bus
Side and output lateral capacitance, reduce volume and cost, while reducing control difficulty.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of electric power electric transformer system；
Fig. 2 is the structural schematic diagram of alternate voltage changing module；
Fig. 3 is the waveform diagram of output voltage Udcn (t)；
Fig. 4 is the drive signal waveform figure of control switch；
Fig. 5 is the flow chart of Voltage loop control.
Specific embodiment
The present invention will be further explained with reference to the accompanying drawing.
As shown in Figs. 1-2, a kind of electric power electric transformer system, comprising: the alternate transformation mould of the alternate voltage changing module of A phase, B phase
Block, the alternate voltage changing module of C phase, each alternate voltage changing module 1 include: multiple power conversion modules 2, the power conversion modules packet
It includes: alternating current inlet wire end, exchange leading-out terminal, direct current output anode, direct current output negative terminal；It is more in the alternate voltage changing module of the A phase
The alternating current inlet wire end of a power conversion modules with exchange leading-out terminal and successively connect downwards, the direct current output of multiple power conversion modules
Anode is connected with rectilinear generatrix anode, and the direct current output negative terminal of multiple power conversion modules is connected with rectilinear generatrix negative terminal
It connects；The alternating current inlet wire end of multiple power conversion modules in the alternate voltage changing module of the B phase with exchange leading-out terminal and successively go here and there downwards
Connection, the direct current output anode of multiple power conversion modules is connected with rectilinear generatrix anode, multiple power conversion modules it is straight
Stream output negative terminal is connected with rectilinear generatrix negative terminal；The friendship of multiple power conversion modules in the alternate voltage changing module of the C phase
Flow into line end with exchange leading-out terminal and successively connect downwards, the direct current output anode of multiple power conversion modules with rectilinear generatrix just
End is connected, and the direct current output negative terminal of multiple power conversion modules is connected with rectilinear generatrix negative terminal；The alternate transformation of the A phase
The alternating current inlet wire end of first power conversion modules in module is connected with A phase ac bus；The alternate voltage changing module of the B phase
In the alternating current inlet wire end of first power conversion modules be connected with B phase ac bus；In the alternate voltage changing module of the C phase
The alternating current inlet wire end of first power conversion modules is connected with C phase ac bus；Most one in the alternate voltage changing module of the A phase
Most power conversion modules in the exchange leading-out terminal voltage changing module alternate with B phase of a power conversion modules exchange outlet
End, most one power conversion modules in the alternate voltage changing module of C phase exchange leading-out terminal be connected.
The power conversion modules 2 include: H-bridge unit 21, DAB resonance circuit 22, and the H-bridge unit and DAB resonance are electric
Road is connected by first capacitor C1, and the H-bridge unit input terminal is alternating current inlet wire end, exchange leading-out terminal, and DAB resonance circuit is defeated
Outlet is direct current output anode, direct current output negative terminal, is provided with second between the direct current output anode and direct current output negative terminal
Capacitor C2；The alternating current inlet wire end of the H-bridge unit is set as voltage UAC (t) with voltage between leading-out terminal is exchanged, and H-bridge unit is defeated
Outlet voltage is set as Udcn (t), and the switching frequency of DAB resonance circuit is set as fs (t), the direct current output of DAB resonance circuit
Voltage is set as voltage Uout between anode, direct current output negative terminal, and the no-load voltage ratio on the former secondary side of the voltage device of DAB resonance circuit is n, function
It is Iout that rate conversion module, which exports electric current, and power conversion modules output power is p (t), the first capacitor C1, the second capacitor C2
For filtering out higher hamonic wave, the voltage device primary side is provided with inductance L.
It is in parallel after control switch R1, R2, R3, R4 in the H-bridge unit, R1, R2 series connection with R3, R4 series arm；Institute
Control switch P1, P2, P3, the P4 for stating DAB resonance circuit primary side, are in parallel after P1, P2 series connection with P3, P4 series arm；It is described
Control switch S1, S2, S3, the S4 on DAB resonance circuit pair side, are in parallel after S1, S2 series connection with S3, S4 series arm.
Described control switch R1, R2, R3, R4, control switch P1, P2, P3, P4, control switch S1, S2, S3, S4 can be used
IGBT or MOSFET.
As in Figure 3-5, a kind of control method of electric power electric transformer system, the specific steps are as follows:
Step 1:H bridge unit rectifies input voltage UAC (t), as input voltage UAC > 0, R1 and R4 conducting, when
When input voltage UAC < 0, R3 and R2 conducting, equal output voltage Udcn (t), the voltage fluctuation containing 2 frequencys multiplication.
Step 2: as Udcn < nUout, the driving signal that control switch P1 and P2 is arranged is complementary, control switch P3 and P4
Driving signal it is complementary, the driving signal of control switch P1 and P3 are complementary；The driving signal that control switch S1 and S2 is arranged is complementary,
The driving signal of control switch S3 and S4 are complementary, and the driving signal time that the advanced S1 of driving signal of control switch S3 is arranged is g
(t), the control switch S1 driving signal lag P1 driving signal time is w (t), in which:
DAB resonance frequency is calculated by formula (2).
Step 3: as Udcn > nUout, the driving signal that control switch P1 and P2 is arranged is complementary, control switch P3 and P4
Driving signal it is complementary, the driving signal that control switch S1 and S2 is arranged is complementary, and the driving signal of control switch S3 and S4 are complementary,
The driving signal of control switch S1 and S3 are complementary, and the setting control switch P1 driving signal advanced S1 driving signal time is g (t),
P1 driving signal lags the P3 driving signal time as v (t), in which:
DAB resonance frequency is calculated by formula (4).
Step 4: output voltage instruction value Uout_ref and actual output voltage Uout passes through pi regulator, with Uout_
Ref/Iout obtains load R after subtracting each other, the DC bus-bar voltage Udcn (t) of H-bridge unit obtains input current Iin divided by load R,
Iin is multiplied to obtain power P (t) with Udcn (t).
Step 5: the power P (t) that will be calculated substitutes into formula (2) respectively or formula (4) acquires DAB resonance frequency fs
(t)。
Embodiment:
Since individual module output voltage Uout contains 2 double-frequency fluctuations, contain 2 after the output voltage of m module of A phase is in parallel
Double-frequency fluctuation contains 2 double-frequency fluctuations, contains 2 after m module output voltage of C phase is in parallel after m module output voltage of B phase is in parallel
2 double-frequency fluctuations, the total output of system are offset in double-frequency fluctuation, 120 ° of the output voltage phase difference of three-phase, A, B, C three-phase voltage parallel connection
Voltage fluctuation is smaller, so capacitor C1, C2 capacitance is smaller.
The above is only a preferred embodiment of the present invention, it should be pointed out that: for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (7)
1. a kind of electric power electric transformer system, comprising: the alternate voltage changing module of A phase, the alternate voltage changing module of B phase, the alternate transformation of C phase
Module, it is characterised in that: each alternate voltage changing module includes: multiple power conversion modules, and the power conversion modules include: to hand over
Flow into line end, exchange leading-out terminal, direct current output anode, direct current output negative terminal；Multiple power in the alternate voltage changing module of the A phase
The alternating current inlet wire end of conversion module with exchange leading-out terminal and successively connect downwards, the direct current output anode of multiple power conversion modules is equal
It is connected with rectilinear generatrix anode, the direct current output negative terminal of multiple power conversion modules is connected with rectilinear generatrix negative terminal；Institute
State the alternating current inlet wire ends of multiple power conversion modules in the alternate voltage changing module of B phase with exchange leading-out terminal and successively connect downwards, it is more
The direct current output anode of a power conversion modules is connected with rectilinear generatrix anode, the direct current output of multiple power conversion modules
Negative terminal is connected with rectilinear generatrix negative terminal；The alternating current inlet wire of multiple power conversion modules in the alternate voltage changing module of the C phase
End with exchange leading-out terminal and successively connect downwards, the direct current output anode of multiple power conversion modules is connected with rectilinear generatrix anode
It connects, the direct current output negative terminal of multiple power conversion modules is connected with rectilinear generatrix negative terminal；In the alternate voltage changing module of the A phase
The alternating current inlet wire end of first power conversion modules be connected with A phase ac bus；In the alternate voltage changing module of the B phase
The alternating current inlet wire end of one power conversion modules is connected with B phase ac bus；First in the alternate voltage changing module of the C phase
The alternating current inlet wire end of power conversion modules is connected with C phase ac bus；A most power in the alternate voltage changing module of the A phase
Most power conversion modules in the exchange leading-out terminal voltage changing module alternate with B phase of conversion module exchange leading-out terminal, C phase phase
Between the exchange leading-out terminals of most one power conversion modules in voltage changing module be connected.
2. a kind of electric power electric transformer system according to claim 1, it is characterised in that: the power conversion modules 2
It include: H-bridge unit, DAB resonance circuit, the H-bridge unit is connected with DAB resonance circuit by first capacitor C1, the H bridge
Unit input terminal is alternating current inlet wire end, exchange leading-out terminal, and DAB resonance circuit output end is direct current output anode, direct current output is negative
End, is provided with the second capacitor C2 between the direct current output anode and direct current output negative terminal；The alternating current inlet wire end of the H-bridge unit
It is set as voltage UAC (t) with voltage between leading-out terminal is exchanged, H-bridge unit output end voltage is set as Udcn (t), DAB resonance electricity
The switching frequency on road is set as fs (t), and voltage is set as between the direct current output anode of DAB resonance circuit, direct current output negative terminal
The no-load voltage ratio on the former secondary side of the voltage device of voltage Uout, DAB resonance circuit is n, and it is Iout that power conversion modules, which export electric current, and power becomes
Mold changing block output power is p (t), and the first capacitor C1, the second capacitor C2 are for filtering out higher hamonic wave, the voltage device primary side
It is provided with inductance L.
3. a kind of electric power electric transformer system according to claim 2, it is characterised in that: controlled in the H-bridge unit
Switch R1, R2, R3, R4, are in parallel after R1, R2 series connection with R3, R4 series arm；The control of the DAB resonance circuit primary side is opened
P1, P2, P3, P4 are closed, is in parallel after P1, P2 series connection with P3, P4 series arm；The control switch on the DAB resonance circuit pair side
S1, S2, S3, S4 are in parallel after S1, S2 series connection with S3, S4 series arm.
4. a kind of electric power electric transformer system according to claim 3, it is characterised in that: the control switch R1, R2,
IGBT or MOSFET can be used in R3, R4.
5. a kind of electric power electric transformer system according to claim 3, it is characterised in that: the control switch P1, P2,
IGBT or MOSFET can be used in P3, P4.
6. a kind of electric power electric transformer system according to claim 3, it is characterised in that: the control switch S1, S2,
IGBT or MOSFET can be used in S3, S4.
7. a kind of control method of electric power electric transformer system according to any one of claims 1 to 6, feature exist
In: include the following steps:
Step 1:H bridge unit rectifies input voltage UAC (t), and as input voltage UAC > 0, input is worked as in R1 and R4 conducting
When voltage UAC < 0, R3 and R2 conducting, equal output voltage Udcn (t), the voltage fluctuation containing 2 frequencys multiplication；
Step 2: as Udcn < nUout, the driving signal that control switch P1 and P2 is arranged is complementary, the drive of control switch P3 and P4
Dynamic signal is complementary, and the driving signal of control switch P1 and P3 are complementary；The driving signal that control switch S1 and S2 is arranged is complementary, control
The driving signal of switch S3 and S4 are complementary, and the driving signal time that the advanced S1 of driving signal of control switch S3 is arranged is g (t),
Control switch S1 driving signal lags the P1 driving signal time as w (t), wherein:
DAB resonance frequency is calculated by formula (2)；
Step 3: as Udcn > nUout, the driving signal that control switch P1 and P2 is arranged is complementary, the drive of control switch P3 and P4
Dynamic signal is complementary, and the driving signal that control switch S1 and S2 is arranged is complementary, and the driving signal of control switch S3 and S4 are complementary, control
The driving signal of switch S1 and S3 are complementary, and the setting control switch P1 driving signal advanced S1 driving signal time is g (t), and P1 drives
The dynamic signal lag P3 driving signal time is v (t), in which:
DAB resonance frequency is calculated by formula (4)；
Step 4: output voltage instruction value Uout_ref and actual output voltage Uout passes through pi regulator, with Uout_ref/
Iout obtains load R after subtracting each other, the DC bus-bar voltage Udcn (t) of H-bridge unit obtains input current Iin, Iin divided by load R
It is multiplied to obtain power P (t) with Udcn (t)；
Step 5: the power P (t) that will be calculated substitutes into formula (2) respectively or formula (4) acquires DAB resonance frequency fs (t).
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| CN201811606155.4A CN109687730B (en) | 2018-12-26 | 2018-12-26 | Power electronic transformer system and control method thereof |
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| CN201811606155.4A CN109687730B (en) | 2018-12-26 | 2018-12-26 | Power electronic transformer system and control method thereof |
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| CN109687730B CN109687730B (en) | 2020-11-17 |
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| CN109687730B (en) | 2020-11-17 |
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