CN107968571A - A kind of double active three phase-shifting control methods of bridging parallel operation - Google Patents
A kind of double active three phase-shifting control methods of bridging parallel operation Download PDFInfo
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- CN107968571A CN107968571A CN201711208282.4A CN201711208282A CN107968571A CN 107968571 A CN107968571 A CN 107968571A CN 201711208282 A CN201711208282 A CN 201711208282A CN 107968571 A CN107968571 A CN 107968571A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- 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
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- Dc-Dc Converters (AREA)
Abstract
The present invention relates to the control method of double active bridging parallel operations, it is desirable to provide a kind of double active three phase-shifting control methods of bridging parallel operation.It is that the output voltage controller for being used for adjusting output voltage is set in double active bridge DC converters of two-way topological structure, the input signal of the output voltage controller is the set-point of secondary side DC voltage and the difference of actual measured value, it is control signal α that it, which exports signal, for adjusting the duty cycle D1 and D2 and its phase difference D3 of primary side bridge arm mid-point voltage and secondary side bridge arm mid-point voltage.The present invention solves the problems, such as double active bridge current stress optimal solutions and control complexity：Corresponding D1, D2 and D3 when trying to achieve the inductive current stress minimum value under each power points, and the relation between three is solved, propose easy control method, only can be achieved with converter with a PI controller is run by the track of current stress minimum.
Description
Technical field
The present invention relates to the control method of the double active bridging parallel operations of a kind of single-phase or multiphase, belongs to the double of field of power electronics
To direct-current isolating switch power supply direction.
Background technology
Converter with isolation, energy in bidirectional flow has a wide range of applications demand, such as microgrid, solid-state transformer, electricity
Electrical automobile charging pile etc..The either reversible transducer of exchange or direct current, its core are all that medium-high frequency isolates two-way DC-
DC converters.In practical applications, to reduce energy loss, cost and volume, efficiency and power density are that evaluation isolation is two-way
The important indicator of DC-DC converter.
In numerous isolation bidirectional DC-DC converter topologys, double active bridges flexibly, are easily realized because of its symmetrical configuration, control
No-voltage is opened and is widely studied and applied.The topological structure of common single-phase double active bridges is as shown in Figure 1, the topological structure
For symmetrical structure, transformer primary side and secondary side form full-bridge circuit, V by switching tubeabAnd VcdIt is primary side and two respectively
Secondary side bridge arm mid-point voltage, iLIt is inductive current.Two full-bridge circuits are connected by a medium/high frequency transformer.
Common single-phase double active bridges share four bridge arms, and phase difference can be produced between each bridge arm, thus have three controls
Variable, including VabAnd VcdDuty cycle D1And D2, and the phase difference between Vab and Vcd.Traditional phase shift modulation method is only adjusted
φ is saved, and keeps D1And D2For 50%, this method control is simple and switching tube can realize that no-voltage opens (ZVS-on) spy automatically
Property, but being limited in scope and there are larger current stress of opening of no-voltage, can increase conduction loss.Scholars carry out
To this numerous studies, research emphasis is to try to adjust D at the same time1、D2And φ, with smaller current stress, reduce conduction loss.
2013 in IEEE Transaction on Industrial Electronics【Power electronics periodical】On deliver
“Current-stress-optimized switching strategy of isolated bidirectional DC–DC
The texts of converter with dual-phase-shift control " one, it is proposed that while adjust D1、D2Reduce electric current with φ
Stress, but since D1 and D2 keeps equal, which has substantially only carried out the adjusting of two dimensions, tries to achieve
Current stress minimum value is only the optimal of part；2012 in IEEE Transaction on Power Electronics
【Power electronics periodical】" the Closed form solution for minimum conduction loss delivered
The texts of modulation of DAB converters " one, by varying D1, D2Decoupling with tri- dimensions of φ is adjusted to be led to reduce
Logical loss, but this method expression formula is complicated, and without progress closed loop design, complicated control method under medium power level
Make them unsuitable for engineering practice.2016 in IEEE Transaction on Industrial Electronics【Electric power electricity
Sub- periodical】On " the Unified Triple-Phase-Shift Control to Minimize Current Stress that deliver
And Achieve Full Soft-Switching of Isolated Bidirectional DC-DC Converter ", carry
The method using Karush-Kuhn-Tucker conditions is gone out, by freely adjusting three dimensions, has tried to achieve under each power points
The minimum value of current stress, but this method adjusts D1、D2With the size for needing to know output power during Df, then increase electricity is needed
Flow sensor carries out output current real-time sampling, and the electric current of high frequency is difficult to adopt standard, add cost and the control of controller
Difficulty.
In summary, existing double active bridge control methods can not take into account current stress optimal solution and control complexity.
The content of the invention
The technical problem to be solved in the present invention is overcome deficiency of the prior art, there is provided a kind of double active bridging parallel operations
Three phase-shifting control methods.This method adjusts D by three phase-shifting control methods1、D2And D3, reach double active bridge inductive current stress
To minimum value, and the internal relation of three dimensions is found, simplify control method, it is simple and practicable, suitable for engineering practice.
To solve technical problem, solution of the invention is：
A kind of double active three phase-shifting control methods of bridging parallel operation are provided, are double active bridge direct currents changes in two-way topological structure
The output voltage controller for being used for adjusting output voltage is set in parallel operation, and the input signal of the output voltage controller is secondary side
The set-point of DC voltage and the difference of actual measured value, it is control signal α that it, which exports signal, for adjusting in primary side bridge arm
The duty cycle D of point voltage and secondary side bridge arm mid-point voltage1And D2And its phase difference D3；
The duty cycle D of primary side and secondary side the bridge arm mid-point voltage1And D2And phase difference D between the two3, lead to
Cross following formula and calculate acquisition：
In above-mentioned formula, α is the control signal of output voltage controller output, its value range is [0,1]；V1And V2Point
It is not the DC voltage of primary side and secondary side, n is no-load voltage ratio n of the primary side to secondary side:1, n value range is unlimited, and d is change
The voltage gain of parallel operation compares nV2/V1。
In the present invention, the primary side of double active bridge DC converters can be exchanged with secondary side；Double active bridge direct currents
Converter is any one following：Single-phase double active bridge DC converters, the double active bridge DC converters of multiphase, two level are double
The double active bridge DC converters of active bridge DC converter, more level, or the modular multilevel circuit based on double active bridges.
In the present invention, double active bridge DC converters are single-phase double active bridging parallel operations, its primary side and secondary side
Eight switching tubes are shared, are the first switch pipe S1, second switch pipe S2, the switches of the 3rd switching tube S3 and the 4th of primary side respectively
Pipe S4, and the 5th switching tube S5, the 6th switching tube S6, the 7th switching tube S7 and the 8th switching tube S8 of secondary side；Series connection
Switching tube first switch pipe S1 and second switch pipe S2 and the 3rd switching tube S3 to connect and the 4th switching tube S4 simultaneously connect, series connection
5th switching tube S5 and the 6th switching tube S6 and the 7th switching tube S7 to connect and the 8th switching tube S8 simultaneously connect；
The drive signal of all switching tubes is all 50% square-wave signal, is according to phase difference D3, primary side and secondary side
The duty cycle D of bridge arm mid-point voltage1、D2Generation；Wherein, the signal complementation of first switch pipe S1 and second switch pipe S2, the 3rd
The signal of switching tube S3 and the 4th switching tube S4 is complementary, the signal of the 5th switching tube S5 and the 6th switching tube S6 is complementary, the 7th opens
The signal for closing pipe S7 and the 8th switching tube S8 is complementary；The time of the advanced S3 of switching tube S1 is by duty cycle D1Control, the 5th switching tube
The time of the advanced 7th switching tube S7 of S5 is by duty cycle D2Control, between switching tube first switch pipe S1 and the 5th switching tube S5
Phase difference D3Control.
In the present invention, the output voltage controller is controlled with proportional integration PI.
In the present invention, the output voltage controller includes sequentially connected voltage difference comparator, PI controllers and limit
Width device；Wherein, the input signal of voltage difference comparator for secondary side DC voltage set-point and actual measured value difference,
PI controllers control to obtain control signal α, and control signal α is limited in [0,1] by limiter, makes output power and control signal
α is in monotonic relationshi, and by calculating duty cycle D1And D2It is limited in the range of [0,1], D3 is limited in the range of [0,0.5].
Compared with prior art, the present invention has technique effect beneficial below：
Double active three phase-shifting control methods of bridge of the present invention solve double active bridge current stress optimal solutions and control is complicated
The problem of spending：Corresponding D when trying to achieve the inductive current stress minimum value under each power points1、D2And D3, and solve between three
Relation, propose easy control method, only can be achieved with track of the converter by current stress minimum with a PI controller
Operation.
Brief description of the drawings
Fig. 1 is the topological structure of common double active bridge bidirectional DC-DC converters；
Fig. 2 is former secondary bridge arm mid-point voltage waveform and phase relation schematic diagram；
Fig. 3 is the control block diagram of the present invention；
Fig. 4 is to work as V1≥nV2When different loads situation original secondary bridge arm mid-point voltage oscillogram；
Fig. 5 is to work as V1＜ nV2When different loads situation original secondary bridge arm mid-point voltage oscillogram.
Embodiment
The present invention is described in detail below in conjunction with drawings and examples, while also describes technical solution of the present invention solution
Technical problem and beneficial effect certainly, it should be pointed out that described embodiment is intended merely to facilitate the understanding of the present invention, and
Any restriction effect is not played to it.
Single-phase double active bridge bidirectional DC-DC converter circuit topological structures are as shown in Figure 1.Primary side is by four switching tubes
S1-S4 is formed, and two bridge arms form a full-bridge circuit, and the midpoint of two bridge arms is respectively 2 points of a, b.A, 2 points of connections of b become
The first side winding of depressor.Secondary side is made of four switching tube S5-S8, and two bridge arms form a full-bridge circuit, two bridges
The midpoint of arm is respectively 2 points of c, d.C, the secondary side winding of 2 points of connection transformers of d.LkFor transformer leakage inductance or outer power-up
Sense.VabFor the voltage difference between a points and b points；VcdFor the voltage difference between c points and d points；iLFor inductive current；i1And i2Respectively
To output and input electric current；V1For the DC voltage of primary side；V2For the DC voltage of secondary side.
Single-phase double active bridge bidirectional DC-DC converter key operation waveforms are as shown in Fig. 2, D1And D2Primary side is represented respectively
With the duty cycle of secondary side bridge arm mid-point voltage, D3Represent phase difference therebetween.
Control block diagram used by the present embodiment including sequentially connected voltage difference comparator, PI as shown in figure 3, control
Device, limiter, duty cycle and phase difference calculating module and drive signal generation module.Wherein, the input of voltage difference comparator
Signal is the set-point V of secondary side DC voltage2refWith actual measured value V2Difference；The signal is controlled by PI
Signal alpha；The purpose of limiter is that α is limited between 0 to 1, it is easy to accomplish rear class controls, and output power is passed with α in dullness
Increasing relation, works as V2Less than V2refWhen, difference increases output power, makes V for just, control signal α becomes larger2Increase；Work as V2Greatly
In V2refWhen, difference is negative, and control signal α is tapered into, and reduces output power, makes V2Reduce；Pass through duty cycle and phasometer
Module is calculated, former secondary duty cycle D is obtained according to control signal α1, D2And its phase difference D3, calculation formula is as follows：
Wherein V1And V2It is primary side and secondary side DC voltage respectively, n is no-load voltage ratio n of the transformer primary side to secondary side:
1, d compares nV for the voltage gain of converter2/V1, because output power and α are in monotonic increase relation, Fig. 4 and Fig. 5 show respectively
V1≥nV2And V1＜ nV2Two kinds in the case of with changed power former secondary bridge arm mid-point voltage oscillogram, with output power
Increase, α are gradually incremented by, D1, D2, D3Reach the output power of needs according to the change of above-mentioned relation formula.
Finally according to D1、D2And D3Value, pass through drive signal generation module produce eight drive signals：All drivings
Signal is all 50% square-wave signal；S1 and S2 is complementary, S3 and S4 are complementary, S5 and S6 are complementary, S7 and S8 are complementary；The advanced S3's of S1
Time is by D1Control, the time of the advanced S7 of S5 is by D2Control, the phase difference between S1 and S5 is by D3Control.
Claims (5)
1. a kind of double active three phase-shifting control methods of bridging parallel operation, it is characterised in that be double active bridges in two-way topological structure
The output voltage controller for being used for adjusting output voltage is set in DC converter, and the input signal of the output voltage controller is
The set-point of secondary side DC voltage and the difference of actual measured value, it is control signal α that it, which exports signal, for adjusting primary side
The duty cycle D of bridge arm mid-point voltage and secondary side bridge arm mid-point voltage1And D2And its phase difference D3；
The duty cycle D of primary side and secondary side the bridge arm mid-point voltage1And D2And phase difference D between the two3, under
State formula and calculate acquisition：
Work as V1≥nV2
Work as V1＜ nV2
In above-mentioned formula, α is the control signal of output voltage controller output, its value range is [0,1]；V1And V2It is respectively
The DC voltage of primary side and secondary side, n are no-load voltage ratio n of the primary side to secondary side:1, n value range is unlimited, and d is converter
Voltage gain compare nV2/V1。
2. according to the method described in claim 1, it is characterized in that, the primary side of double active bridge DC converter with it is secondary
Side can exchange；Double active bridge DC converters are any one following：Single-phase double active bridge DC converters, multiphase pair have
The double active bridge DC converters of source bridge DC converter, two level, the double active bridge DC converters of more level, or had based on double
The modular multilevel circuit of source bridge.
3. according to the method described in claim 1, it is characterized in that, double active bridge DC converters are single-phase double active bridges
Converter, its primary side share eight switching tubes with secondary side, are first switch pipe S1, the second switch pipe of primary side respectively
S2, the 3rd switching tube S3 and the 4th switching tube S4, and the 5th switching tube S5 of secondary side, the 6th switching tube S6, the 7th switch
Pipe S7 and the 8th switching tube S8；The switching tube first switch pipe S1 and second switch pipe S2 of series connection and the 3rd switching tube S3 to connect
With the 4th switching tube S4 and connect, the 5th switching tube S5 of series connection and the 6th switching tube S6 and the 7th switching tube S7 to connect and the 8th
Switching tube S8 simultaneously connects；
The drive signal of all switching tubes is all 50% square-wave signal, is according to phase difference D3, in primary side and secondary side bridge arm
The duty cycle D of point voltage1、D2Generation；Wherein, the signal complementation of first switch pipe S1 and second switch pipe S2, the 3rd switching tube
The signal complementation of the complementation of the signal of S3 and the 4th switching tube S4, the 5th switching tube S5 and the 6th switching tube S6, the 7th switching tube S7
It is complementary with the signal of the 8th switching tube S8；The time of the advanced S3 of switching tube S1 is by duty cycle D1Control, the 5th switching tube S5 are advanced
The time of 7th switching tube S7 is by duty cycle D2Control, the phase difference between switching tube first switch pipe S1 and the 5th switching tube S5
D3Control.
4. according to the method described in claim 1, it is characterized in that, the output voltage controller is controlled with proportional integration PI.
5. according to the method described in claim 1, it is characterized in that, the output voltage controller includes sequentially connected voltage
Difference comparsion device, PI controllers and limiter；Wherein, the input signal of voltage difference comparator giving for secondary side DC voltage
The difference of definite value and actual measured value, PI controllers control to obtain control signal α, and control signal α is limited in [0,1] by limiter
Interior, it is in monotonic relationshi to make output power and control signal α, and by calculating duty cycle D1And D2It is limited in [0,1] scope
Interior, D3 is limited in the range of [0,0.5].
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| CN109361318A (en) * | 2018-09-19 | 2019-02-19 | 上海交通大学 | Single-stage isolated type pfc converter Direct Current Control system and control method based on DAB |
| CN109698626A (en) * | 2018-12-18 | 2019-04-30 | 东南大学 | A kind of combined type input series and output parallel commutator transformer and its control method suitable for middle straightening stream power distribution network |
| CN110034686A (en) * | 2019-04-22 | 2019-07-19 | 中国科学院电工研究所 | Double active bridging parallel operations based on SiC-Si combined power semiconductor device switch |
| CN110034685A (en) * | 2019-04-22 | 2019-07-19 | 中国科学院电工研究所 | The double active bridging parallel operations of series resonance-type based on Si-IGBT and SiC-MOSFET hybrid switch |
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| CN115955122A (en) * | 2022-12-27 | 2023-04-11 | 常熟理工学院 | Backflow-free modulation method and system for double-bridge series resonant converter |
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