CN109802575A - A kind of two-way full-bridge three-level DC-DC converter optimal control method - Google Patents
A kind of two-way full-bridge three-level DC-DC converter optimal control method Download PDFInfo
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- CN109802575A CN109802575A CN201910257705.4A CN201910257705A CN109802575A CN 109802575 A CN109802575 A CN 109802575A CN 201910257705 A CN201910257705 A CN 201910257705A CN 109802575 A CN109802575 A CN 109802575A
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- 230000010363 phase shift Effects 0.000 claims description 5
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- 238000010992 reflux Methods 0.000 abstract description 19
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 238000002955 isolation Methods 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
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- 238000010586 diagram Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention discloses a kind of two-way full-bridge three-level DC-DC converter reflux the smallest control method of power, it is primary side bridge arm mid-point voltage duty ratio D respectively that it is controllable that there are three control amounts in the topological structure of two-way full-bridge three-level DC-DC converter1, pair side bridge arm mid-point voltage duty ratio D2Phase shift ratio between former and deputy side bridge arm mid-point voltageConverter reflux power the smallest control is realized under the premise of meeting power needed for traffic load.Invention control method may be implemented: coordinated control D1、D2、In the case where the power needed for meeting load, keeps converter reflux power minimum, to reduce the current stress of power device, and then reduce the on-state loss of switching device and magnetic element.Meanwhile in entire transmission power range, all switching tubes in circuit can realize that no-voltage is connected, and effectively reduce the switching loss of power device.
Description
Technical field
The present invention relates to power electronic devices control technology fields.
Background technique
Isolation type bidirectional DC-DC converter can be run with two quadrant and can be realized input, outlet side electrical isolation
DC-DC converter, its important component as electric power electric transformer, in intelligent micro-grid, distributed generation system
And it is widely used in electric locomotive traction system.
High-power isolation type bidirectional DC-DC converter it is more common be two-way two level circuit structure of full-bridge, it is by two
Symmetrical H bridge, intermediate-frequency transformer and two DC voltage-stabilizing capacitors are constituted.This transformer configuration is simple, and power density is big, can be real
Existing electrical isolation and energy capable of bidirectional flowing.But the voltage that each switching tube in this converter topology is born is input
Voltage or output voltage, thus limited by switching tube stress levels and device cost, be not suitable for being applied to high voltage occasion.
Two-way full-bridge three-level DC-DC converter is by two symmetrical full-bridge three-level circuits, intermediate-frequency transformer and four
DC voltage-stabilizing capacitor composition.Other than having the advantages that two-way full-bridge DC-DC converter, a distinguishing feature also having is for it
The voltage stress of each switching tube only has the half of input voltage or output voltage in circuit.Meanwhile it is constant in operating current
Under the conditions of, three-level converter can significantly improve inverter power grade compared to two level circuits.
The principle of two-way full-bridge three-level DC-DC converter application tradition phase-shifting control is: in circuit in primary side bridge arm
Four switching tube (S11、S12、S17、S18) simultaneously turn on, other four switching tube (S13、S14、S15、S16) it is complementary conducting；It is secondary
In the bridge arm of side, four switching tube (S21、S22、S27、S28) simultaneously turn on, other four switching tube (S23、S24、S25、S26) mutual with it
Mend conducting.There are phase shifting angles between the Continuity signal of two symmetrical switching tubes between two bridge arms, when phase shifting angle is corresponding
Between with the ratio of half period be Positive and negative decision transimission power direction, size determine transimission power size.
Phase shifting control is simply easily realized, but no three level using converter export advantage.Meanwhile in t0-t’0And t2-t’2Two
In the section time, vabWith iLOpposite in phase illustrates that the power that converter pair side should be passed within this twice has flowed back into change
There is power backflow phenomenon in parallel operation primary side, and the power of this partial reflux is just called reflux power.In system operation
In if there is power flow back exist, in order to supply the power of reflux, reach specified transimission power, must increase output electricity
Stream to increase the current stress of power device, and then increases the loss of switching device and magnetic element, reduces the effect of converter
Rate.In view of the disadvantage mentioned above of the prior art, it is necessary to carry out research update to the control strategy of converter.
Summary of the invention
The object of the present invention is to provide a kind of two-way full-bridge three-level DC-DC converter optimal control methods, it can be effective
Ground solves the technical issues of two-way full-bridge three-level DC-DC converter reflux power control.
The purpose of the present invention is what is realized by following means:
A kind of two-way full-bridge three-level DC-DC converter control method, the two-way full-bridge three-level DC-DC converter have
Three control amounts are primary side bridge arm mid-point voltage duty ratio D respectively1, pair side bridge arm mid-point voltage duty ratio D2With former and deputy side bridge
Phase shift ratio between arm mid-point voltageIts controller includes that voltage control module, optimal control module and switching signal generate
Module；The control strategy of use includes the following steps:
Step 1: the voltage control module of controller passes through to load side voltage V2With reference voltage V2refError carry out
Feedback control obtains phase shift ratio
Step 2: read in step 1 as a result, look-up table means obtain primary side bridge arm mid-point voltage according to following rule
Duty ratio D1With the duty ratio D of secondary side bridge arm mid-point voltage2:
WhenRange existWhen,
WhenRange existWhen,
WhenRange existWhen,
Step 3: step 1 is obtainedThe D that step 2 obtains1And D2Input switch signal generator module generates
Corresponding switching signal utilizes the on-off of switching device in switching signal control main circuit.
Compared with prior art, control method of the present invention may be implemented: coordinated control D1、D2、Meeting needed for load
In the case where power, keeps converter reflux power minimum, to reduce the current stress of power device, and then reduce switching device
With the on-state loss of magnetic element.Meanwhile in entire transmission power range, all switching tubes in circuit can realize zero
Voltage turn-on effectively reduces the switching loss of power device.
Detailed description of the invention
Fig. 1 is the topological structure of isolation type bidirectional full-bridge three-level DC-DC converter.
Fig. 2 is the working waveform figure of tradition phase-shifting control.
Fig. 3 is six kinds of operating conditions of two-way full-bridge three-level DC-DC converter forward power.Wherein, scheme (a), (b),
(c), (d), (e), (f) respectively indicate 1., 2., 3., 4., 5., the work wave of 6. six kinds of situations.
When Fig. 4 is k=0.3,0.5,0.7,0.9, D1、D2AboutReflux power minimum control relation curve.
Fig. 5 is the implementation block diagram of tradition phase-shifting control.
Fig. 6 is the implementation block diagram of reflux power minimum control method.
Fig. 7 is switching tube turn-on time and D1、D2WithRelationship.
Specific embodiment
The specific implementation procedure and technology of control method of the present invention derive as follows:
The structure of the two-way unilateral three-level DC-DC converter of full-bridge is as shown in Figure 1, wherein S11~S18、S21~S28For switch
Pipe, C1~C4For DC voltage-stabilizing capacitance, D1~D8For clamp diode, L is inductance, and MFT is intermediate-frequency transformer, V1For input
DC voltage, V2To export DC voltage.
The mid-point voltage v of the two-way each bridge arm of full-bridge three-level DC-DC converterabAnd vcdCan export it is positive and negative, 03
A level.Work as S11、S12、S17、S18Conducting, vabFor positive level；Work as S12And S17Or S13And S16Conducting, vabFor zero level；Work as S13、
S14、S15、S16Conducting, vabFor negative level.Work as S21、S22、S27、S28Conducting, vcdFor positive level, work as S22And S27Or S23And S26It leads
It is logical, vcdFor zero level, work as S23、S24、S25、S26Conducting, vcdFor negative level.vabPositive and negative level in a switch periods
Action time is identical, and the ratio of action time and half of switch periods is D1。vcdWork of the positive and negative level in a switch periods
Identical with the time, the ratio of action time and half of switch periods is D2.Circuit transmission power is by D1、D2WithIt influences, wherein
The ratio of phase shifting angle corresponding time and half of switch periods between former and deputy side bridge arm mid-point voltage.It not only influences to pass
The size of defeated power,It is positive and negative also determine transimission power direction.
Two-way full-bridge three-level DC-DC converter is in forward power, with D1、D2、Take different values, circuit
There are six kinds of operating conditions, shown in the work wave of six kinds of operating conditions such as Fig. 3 (a)~(f).Wherein three kinds of operating conditions (4., 5., 6.) are in electric current
For in a period of time of maximum value, transimission power, does not increase current stress, system effectiveness is reduced.Therefore, only using remaining
Three kinds of operating conditions (1., 2., 3.).
1., 2., 3. three kinds of operating conditions want can by control D1And D2Change the action time of the positive negative level of output port, needs
Meet and flow through in switching tube, such as Fig. 3 (a) and require in positive negative level finish time (switching tube turns off the moment) electric current: iL(t2)≥
0, iL(t3)≤0.When switching tube is connected, the condition of ZVS are as follows: before switching tube conducting, operating current flows through its antiparallel two pole
Pipe, for example, in Fig. 3 (a): iL(t0) >=0, iL(t1)≤0.1., 2., 3. three kinds of operating conditions can pass through control D1、D2、To expire
The requirement of foot above-mentioned switch OFF and conducting.
1., D when 2., 3. realizing reflux power minimum control under three kinds of operating conditions1、D2、Relationship analysis it is as follows:
According in Fig. 3 1., 2., the work wave of 3. three kinds of situations, calculate the expression formula of transimission power under every kind of operating condition:
K=nV in formula2/V1, n is transformer voltage ratio, and L is the inductance in circuit, fsFor switching frequency.
By formula (1), (2), (3) it is found that transimission power is D1、D2、Function, it is simple in order to state, use abstract function
Indicate transimission power about D1、D2、Function.
According in Fig. 3 1., 2., the work wave of 3. three kinds of situations, calculate every kind of operating condition downconverter and flow back power:Converter reflux power is also about D1、D2、Function, it is simple in order to state, with abstract letter
Number indicates converter reflux power about D1、D2、Function.
By formula (1), (2), (3), it is found that transmitting identical power meeting, there are many different D1、D2、Combination to realize,
Always there is a kind of combination to keep converter reflux power minimum in all combinations.Calculating makes the converter reflux the smallest D of power1、D2、The step of combination, is as follows:
It is obtained by formula (4)About D1、D2, P relational expression:
Formula (6) substitution formula (5) is obtained into converter reflux power about D1、D2With the relational expression of P:
Q=g1(D1,D2,P) (7)
Respectively to the D in formula (7)1、D2Local derviation is sought, and solves the D for making local derviation zero1、D2About the relational expression of P, obtain:
D1=h1(P) (8)
D2=h2(P) (9)
P in formula (8), (9) is replaced with formula (1), and combine solution formula (8), (9) obtain D1、D2AboutExpression
Formula:
The D obtained according to formula (10), (11)1、D2AboutRelational expression be all D under the certain power of transmission1、D2、
Make the converter reflux the smallest combination of power in combination.
When reverse transfer power, the analytical procedure of control method is same as described above.
According to above-mentioned analytical procedure, obtain keeping converter reflux power minimum from zero load to being fully loaded in entire power bracket
D1、D2AboutRelational expression, as shown in table 1.In different power brackets, D1、D2AboutRelational expression be segmentation
Function, when transimission power is greater thanWhen, D2=1, i.e. converter pair side bridge arm mid-point voltage is two level.It is reversed to pass
When defeated power, make the smallest D of power that flows back1、D2AboutRelational expression be aboutSymmetrically, as shown in Figure 5.
1 D of table1、D2AboutRelational expression
Target is controlled according to the control method analytical procedure of Summary offer and by the satisfaction that table 1 provides
D1、D2AboutExpression formula, Fig. 4 gives when k=0.3,0.5,0.7,0.9, D1、D2AboutControlling curve.Control
Device processed realizes that the specific embodiment for the optimal control method that this patent proposes is as shown in Figure 7:
A), the voltage control module of controller passes through to load side voltage (V2) and reference voltage (V2ref) error carry out
Feedback control obtains phase shift ratio
B), read in a) as a result, obtaining the duty ratio D of primary side bridge arm mid-point voltage according to table 11With secondary side bridge arm mid-point voltage
Duty ratio D2:
WhenRange existWhen,
WhenRange existWhen,
WhenRange existWhen,
C), obtained by step a), b)D1And D2Input switch signal generator module generates corresponding switching signal,
Control the on-off of switching device in main circuit.
Fig. 7 gives switching tube turn-on sequence, turn-on time and parameterD1And D2Relationship.
Fig. 5 is the implementation block diagram of tradition phase-shifting control, the implementation for the minimum reflux power control that Fig. 6 is proposed by this patent
Block diagram.Wherein V2efFor output voltage a reference value, V2For real-time output voltage, SijFor switching tube driving signal, D1For a cycle
Interior vabThe ratio of positive level action time and half of switch periods, D2For v in a cyclecdPositive level action time and half of switch
The ratio in period,For vabWith vcdBetween phase shifting angle corresponding time and half of switch periods ratio.It is compared by Fig. 5, Fig. 6
It is found that control method provided by the invention increases one between existing voltage control module and switching signal generation module
D1、D2Computing module.
Claims (1)
1. a kind of two-way full-bridge three-level DC-DC converter optimal control method, the two-way full-bridge three-level DC-DC converter
There are three control amounts, are primary side bridge arm mid-point voltage duty ratio D respectively1, pair side bridge arm mid-point voltage duty ratio D2With former and deputy side
Phase shift ratio between bridge arm mid-point voltageIts controller includes that voltage control module, optimal control module and switching signal produce
Raw module；The control strategy of use includes the following steps:
Step 1: the voltage control module of controller passes through to load side voltage V2With reference voltage V2refError fed back
Control, obtains phase shift ratio
Step 2: read in step 1 as a result, look-up table means obtain the duty of primary side bridge arm mid-point voltage according to following rule
Compare D1With the duty ratio D of secondary side bridge arm mid-point voltage2:
WhenRange existWhen,
WhenRange existWhen,
WhenRange existWhen,
Step 3: step 1 is obtainedThe D that step 2 obtains1And D2Input switch signal generator module generates correspondence
Switching signal, utilize the switching signal control main circuit in switching device on-off.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110350793A (en) * | 2019-06-11 | 2019-10-18 | 华中科技大学 | A kind of pair of active bridge DC-DC converter and its current stress optimization method |
| CN112217406A (en) * | 2019-07-11 | 2021-01-12 | 台达电子工业股份有限公司 | Power supply device applied to solid-state transformer framework and three-phase power supply system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104253548A (en) * | 2014-07-10 | 2014-12-31 | 西南交通大学 | Three-level power electronic traction transformer of non-power frequency transformer |
| CN106981992A (en) * | 2017-05-17 | 2017-07-25 | 国家电网公司 | Isolation type bidirectional DC converter minimum reflux power phase-shifting control method |
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2019
- 2019-04-01 CN CN201910257705.4A patent/CN109802575B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104253548A (en) * | 2014-07-10 | 2014-12-31 | 西南交通大学 | Three-level power electronic traction transformer of non-power frequency transformer |
| CN106981992A (en) * | 2017-05-17 | 2017-07-25 | 国家电网公司 | Isolation type bidirectional DC converter minimum reflux power phase-shifting control method |
Non-Patent Citations (2)
| Title |
|---|
| HAOCHEN SHI等: "Minimum-Backflow-Power Scheme of DAB-Based Solid-State Transformer With Extended-Phase-Shift Control", 《IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS》 * |
| 程红等: "基于双重移相控制的双向全桥DC-DC 变换器动态建模与最小回流功率控制", 《电工技术学报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110350793A (en) * | 2019-06-11 | 2019-10-18 | 华中科技大学 | A kind of pair of active bridge DC-DC converter and its current stress optimization method |
| CN112217406A (en) * | 2019-07-11 | 2021-01-12 | 台达电子工业股份有限公司 | Power supply device applied to solid-state transformer framework and three-phase power supply system |
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