CN106953521B - A kind of H bridge bi-directional DC-DC modulation strategy based on dual carrier modulation - Google Patents
A kind of H bridge bi-directional DC-DC modulation strategy based on dual carrier modulation Download PDFInfo
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- CN106953521B CN106953521B CN201610808246.0A CN201610808246A CN106953521B CN 106953521 B CN106953521 B CN 106953521B CN 201610808246 A CN201610808246 A CN 201610808246A CN 106953521 B CN106953521 B CN 106953521B
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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
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of non-isolation type H bridge bidirectional DC-DC converter modulation strategies based on dual carrier modulation.It is the following steps are included: measure DC bus-bar voltage by voltage sensorV DC With given valueV ref Compare and makes the difference；Using obtained difference by Voltage loop PI module as current reference valueI ref ；By current reference valueI ref With the inductive current measured by current sensorI l Compare and makes the difference；Obtained difference is passed through into electric current loop PI module, modulates to obtain required PWM wave by double triangle carrier signals；Using this PWM wave as the conducting and shutdown of switching tube pulse drive signal control switch pipe, make switching tube work in duty ratio continuous state.The present invention makes H bridge bidirectional DC-DC converter switching tube duty ratio in pattern switching from on-off state become serialization, and simplified control process, voltage overshoot becomes smaller when switch carries out pattern switching, and regulating time shortens.
Description
Technical field
The present invention relates to new energy energy storage devices.It is related specifically to a kind of H bridge bi-directional DC-DC tune based on dual carrier modulation
System strategy.
Background technique
The world today is fast-developing, gradually decreases tellurian resource, so that natural environment and the life of the mankind are influenced,
Therefore to new energy development and using having obtained the attention in the world, and China is also in actively tapping a new source of energy energetically.With new
The development of the energy needs energy storage device to remove the notch between the supply-demand relationship increased in processing distributed generation system.Therefore it stores up
Can device widely applied, in energy storage device, bidirectional DC-DC converter carry common DC bus and battery it
Between the two-way conveying task of energy, occupy an important position.
In non-isolation type direct-current converter, the bidirectional DC-DC converter of H bridge shown in Fig. 2 is conventional non-isolated code converter,
Have many advantages, such as high-efficient, at low cost, small in size.H bridge bidirectional DC-DC converter one flanks DC bus, another to flank electric power storage
Pond can work in four quadrant running.The circuit at work, switches between four kinds of modes according to demand: Boost electric discharge,
Buck charging, Buck electric discharge and Boost charging.
H bridge bidirectional DC-DC converter at work, needs PWM wave pulse signal to drive four switching tubes.Such as figure
H bridge bidirectional DC-DC converter Traditional control block diagram shown in 3, in Double closed-loop of voltage and current mode, using single carrier wave
When signal is modulated, Buck and to have bounce discontinuous for two duty cycle of switching when Boost pattern switching, therefore when leading to convergence
Between will hinder its fast reaction, switching voltage overshoot is big, and the selection of operating mode and switching tube duty ratio control process become
It is complicated.
Summary of the invention
For it is above-mentioned non-isolation type H bridge bidirectional DC-DC converter according to required mode carry out switching when it is existing
Technical problem.The invention discloses a kind of H bridge bidirectional DC-DC converter automatic pattern switching modulation methods based on dual carrier modulation
Method, when converter being made to carry out pattern switching between Buck and Boost mode, switching tube duty cycle in continuous mode, from
And realize quick and smooth, voltage overshoot reduces when switching, and regulating time shortens.
The scheme that the present invention solves above-mentioned technical problem is: measuring non-isolation type H bridge bi-directional DC-DC by voltage sensor
Converter DC bus-bar voltageV DC With given valueV ref Compare and makes the difference；Using obtained difference by Voltage loop PI module as electric current
Ginseng
Examine valueI ref ；By current reference valueI ref With the inductive current measured by current sensorI l Compare and makes the difference；Will
The difference arrived passes through electric current loop PI module, modulates to obtain required PWM wave by double triangle carrier signals；Using this PWM wave as
The conducting and shutdown of switching tube pulse drive signal control switch pipe make switching tube work in duty ratio continuous state.
The technical effects of the invention are that: for H bridge bidirectional DC-DC converter when different capacity flows to, there are different controls
Simulation, the present invention have studied a kind of automatic pattern switching modulator approach based on dual carrier modulation, make out in pattern switching
Closing pipe duty ratio becomes serialization, simplified control process from on-off state, and becomes voltage overshoot when switch progress pattern switching
Small, regulating time shortens.
Detailed description of the invention
Fig. 1 is the composite type generating system containing energy-storage system in the present invention.
Fig. 2 is non-isolation type bidirectional DC-DC converter in the present invention.
Fig. 3 is bidirectional DC-DC converter operating mode one in the present invention.
Fig. 4 is bidirectional DC-DC converter operating mode two in the present invention.
Fig. 5 is H bridge bidirectional DC-DC converter Traditional control block diagram in the present invention.
Fig. 6 is dual carrier modulation strategy block diagram control model in the present invention.
Fig. 7-1 is bidirectional DC-DC converter operating mode and switch state in the present invention.
Fig. 7-2 is the simplified operating mode of bi-directional DC-DC and switch state in the present invention.
Fig. 8-1 is switching tube duty ratio discontinuous mode control in the present invention.
Fig. 8-2 is switching tube duty ratio continuous mode control in the present invention.
Fig. 9 is work flow diagram of the present invention.
Specific embodiment
With reference to the accompanying drawing, the present invention is described in further detail.
Energy-storage system circuit model can be equivalent to Fig. 2's in the composite type generating system of energy-storage system as shown in Figure 1
Non-isolation type H bridge bidirectional DC-DC converter, wherein Q1 and Q2, Q3 and Q4 driving signal distinguish mutual symmetry.R1It is equivalent for battery
Internal resistance.RonInternal resistance is connected for MOSFET.RLFor inductance internal resistance.RcFor capacitor equivalent internal resistance.
Non-isolation type H bridge bidirectional DC-DC converter working pattern analysis:
One: Q1 constant conduction of mode, Q2 cut-off, there are two working conditions, bidirectional DC-DC converter operating mode is first-class
It is as shown in Figure 3 to imitate circuit.
State 1:Q4 conducting, Q3 cut-off,
State 2(Q4 cut-off, Q3 conducting)
Use state switchs the available matrix of the method for average.
It is available through AC smallsignal model analysis.
Two: Q3 constant conduction of mode, Q4 cut-off, there are two working conditions, bidirectional DC-DC converter operating mode is second-class
It is as shown in Figure 4 to imitate circuit.
State 1(Q1 conducting, Q2 cut-off)
State 2(Q1 cut-off, Q2 conducting)
Use state switchs the available matrix of the method for average
The transmission function of frequency characteristic can be obtained through small-signal model analysis.
It is illustrated in figure 5 non-isolation type H bridge bidirectional DC-DC converter Traditional control block diagram, the drive mode of comparative diagram 7-1
And switch state, respective double-closed-loop control is generally passed through using voltage and current, to select operating mode.
According to above working pattern analysis, present invention introduces dual carrier signal modulation strategies shown in fig. 6, and establish and open
Pipe duty ratio Continuum Model is closed, realizes the automatic pattern switching of quick and smooth.According to H-bridge circuit topology, Q1, Q2, Q3, Q4 divide
Not Shi Yong mutual symmetry driving signal, switch state be listed in Fig. 7-2(1- conducting, 0- shutdown), ~ PWM is complementary with PWM, by whole
It closes, four kinds of scheme controls can be simplified to both of which control.
Known by buck and boost working principle, DC bus-bar voltageV DC And cell voltageV 1Relationship are as follows:
Duty ratio 0 < d2 < 1 of the duty ratio 0 < d1 < 1, Q4 of switching tube Q1.As shown in Fig. 7-1, work as QUOTE When, when Buck mode and Boost mode switch over, switching tube duty ratio is on-off state.Such as
D2 is moved up 1 by fruit, can be obtained by the switching mould of the serialization duty cycle of switching as shown in Fig. 7-2 in dual carrier modulation strategy
Formula.
When H bridge bidirectional DC-DC converter works in pattern switching state, duty ratio d is divided into 0 to 1 and 1 to 2 two
Point, when 0 < d < 1, Buck and Boost pattern switching, Q3 constant conduction, the PWM obtained by dual carrier modulation strategy are carried out at this time
Wave drives Q1 by the PWM of duty ratio d, Q4 cut-off.When 1 < d < 2, when carrying out Buck and Boost pattern switching, Q1 is persistently led
Logical, the PWM wave Q4 obtained by dual carrier modulation strategy is driven by the PWM that duty ratio is d-1.Same modulation strategy process is answered
Switching tube Q2 and Q3 are used, the switching tube duty ratio Continuum Model between each pattern switching is thus established.
It is calculated by above modeling analysis, the non-isolation type H bridge bidirectional DC-DC converter based on dual carrier modulation strategy
When work, pwm pulse signal needed for each switching tube is generated according to work flow diagram shown in Fig. 9, in double carried-based PWMs
Under strategy effect, work in its switching tube under duty ratio continuous state.
Claims (1)
1. a kind of non-isolation type H bridge bidirectional DC-DC converter modulation strategy based on dual carrier modulation, comprising the following steps:
Step1: non-isolation type H bridge bidirectional DC-DC converter DC bus-bar voltage V is measured by voltage sensorDCWith given value
VrefCompare and makes the difference；
Step2: using obtained difference by Voltage loop PI module as current reference value Iref；
Step3: by current reference value IrefWith the inductive current I measured by current sensorlCompare and makes the difference；
Step4: obtained difference is passed through into electric current loop PI module, modulates to obtain required PWM wave by double triangle carrier signals；
Step5: using this PWM wave as the conducting and shutdown of switching tube pulse drive signal control switch pipe；
According to drive mode and switch state, respective double-closed-loop control is passed through using voltage and current, to select operating mode；
Dual carrier signal modulation strategy is introduced, and establishes switching tube duty ratio Continuum Model, realizes the automatic mold of quick and smooth
Formula switching；According to H-bridge circuit topology, Q1, Q2, Q3, Q4 use mutual symmetry driving signal respectively, pass through integration, four kinds of modes
Control can be simplified to both of which control；
Known by buck and boost working principle, DC bus-bar voltage VDCWith cell voltage V1Relationship are as follows:
VDC=V1·d1Buck mode
Boost mode
Duty ratio 0 < d2 < 1 of the duty ratio 0 < d1 < 1, Q4 of switching tube Q1, as DC bus-bar voltage VDCWith cell voltage V1It is equal
When, when Buck mode and Boost mode switch over, switching tube duty ratio is on-off state；If d2 is moved up 1, in double loads
It can be obtained by serialization duty cycle of switching switch mode in wave modulation strategy；
When H bridge bidirectional DC-DC converter works in pattern switching state, duty ratio d is divided into 0 to 1 and 1 to 2 two parts, when
0 < d < 1, carries out Buck and Boost pattern switching at this time, and Q3 constant conduction is made by the PWM wave that dual carrier modulation strategy obtains
Q1 is driven by the PWM that duty ratio is d, Q4 cut-off；When 1 < d < 2, when carrying out Buck and Boost pattern switching, Q1 constant conduction leads to
It crosses the PWM wave Q4 that dual carrier modulation strategy obtains to be driven by the PWM that duty ratio is d-1, same modulation strategy is applied to switch
Pipe Q2 and Q3 thus establish the switching tube duty ratio Continuum Model between each pattern switching；
It is calculated by above modeling analysis, the non-isolation type H bridge bidirectional DC-DC converter work based on dual carrier modulation strategy
When, pwm pulse signal needed for each switching tube is generated according to step step1~step5, is acted in double carried-based PWM strategies
Under, work in its switching tube under duty ratio continuous state.
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| CN109889042A (en) * | 2019-03-26 | 2019-06-14 | 深圳市健网科技有限公司 | The voltage conversion circuit and voltage switching control method of bidirectional DC power supply converter |
| CN113472199B (en) * | 2021-06-30 | 2022-09-27 | 易事特集团股份有限公司 | Mode smooth switching method and system of Buck-Boost circuit |
| CN114221543B (en) * | 2021-11-25 | 2024-05-24 | 西安领充创享新能源科技有限公司 | Control method of H-bridge four-switch circuit and bidirectional charging and discharging device |
| CN115663979A (en) * | 2022-12-13 | 2023-01-31 | 麦田能源有限公司 | Voltage balancing method of battery pack, battery energy storage and power supply system and electronic device |
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Effective date of registration: 20230925 Address after: 411100 No. 778 Shaoshan West Road, Yuhu District, Xiangtan City, Hunan Province Patentee after: XIANGTAN RADIO Co.,Ltd. Address before: 411105 Xiangtan University, Yuhu District, Xiangtan City, Hunan Province Patentee before: XIANGTAN University |