CN108306281A - A kind of four Port Translation device of part isolated form and its control method based on two-way full-bridge DC/DC converters - Google Patents
A kind of four Port Translation device of part isolated form and its control method based on two-way full-bridge DC/DC converters Download PDFInfo
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- CN108306281A CN108306281A CN201810178877.8A CN201810178877A CN108306281A CN 108306281 A CN108306281 A CN 108306281A CN 201810178877 A CN201810178877 A CN 201810178877A CN 108306281 A CN108306281 A CN 108306281A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/14—Balancing the load in a network
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
-
- 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
- H02M3/33584—Bidirectional converters
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The present invention relates to direct-current grid field, specifically a kind of four Port Translation device of part isolated form and its control method based on two-way full-bridge DC/DC converters.The port that the present invention solves traditional multiport converter is not isolated, and energy one-way flow, use occasion, voltage class are restricted, problem of high cost.There are four external connectivity ports in total for four port, wherein two connection photovoltaic generation units, a connection energy-storage system, another connection DC bus.Two are connected between photovoltaic generation unit and energy-storage system with Boost, have ensured the reliability in energy source；It is connected with two-way full-bridge DC/DC converters between energy-storage system and DC bus, energy can be with two-way flow, and realizes isolation.The detailed design of the present invention Power Exchange mechanism of energy-storage system, photovoltaic generation unit and DC bus, stable DC busbar voltage have ensured the stability of power supply.The present invention is suitable for direct-current grid, has good Technical Economy.
Description
Technical field
The present invention relates to direct-current grid field, specifically a kind of part isolation based on two-way full-bridge DC/DC converters
Four Port Translation device of type and its control method.
Background technology
Energy crisis with getting worse and environmental pollution, the regenerative resources such as photovoltaic (PV) and wind energy are more next
It is used more.However, the discontinuity of regenerative resource and the unpredictability of workload demand are to the wide of these clean energy resourcies
General popularization brings challenge.Multiport converter is that each DC/DC converters independent mutually are concentrated, and forms one with more
The converter of a port.It, can each discrete two-port in substitution system by multiport converter applications to micro-capacitance sensor
Converter reduces and improves the generating efficiency and power of photovoltaic using the quantity of power device and passive device to reduce cost
Density.Multiport converter can connect and control simultaneously multiple power ports, and the high, efficiency with power density in micro-capacitance sensor
Feature high, dynamic property is good and compact-sized, it has also become the hot spot of domestic and foreign scholars' research, while also being obtained in industrial circle
To being more and more widely used.
For multiport converter circuit topology, a large amount of research has been carried out in domestic and foreign scholars, and proposes one
A little multiport converter circuit topological structures.Some documents propose several different Port Translation device circuit topological structures, but
Multiple ports can only one-way transmission energy to one of port, reduce the flexibility of microgrid.More also propose one kind
Three port DC/DC converter circuit topological structures of non-isolation type, the structure can reduce component count, and compact-sized.But
Since three all ports are directly connected to, it is not isolated between port, is only applicable to not need the occasion of electrical insulation, while its
Voltage can only be modulated by duty ratio, and voltage gain is limited, and energy is unable to two-way flow.Therefore, related scholar's design
A kind of isolated converter, realizes port isolation, while being well matched between different port not using high frequency transformer
Same voltage class, and realize energy in bidirectional flow.However, the number of elements used in this converter is very big, cost is excessively high,
And efficiency is affected, and causes prodigious waste.Therefore, there are many defects in existing multiport converter, limit it
It promotes the use of.
Invention content
The present invention is not isolated to solve the port of traditional multiport converter, energy one-way flow, use occasion, electricity
The problem for pressing grade restricted, of high cost, provides a kind of four port of part isolated form based on two-way full-bridge DC/DC converters
Converter and its control method.Only need to realize the isolation between DC bus and DC power supply in practical microgrid, each power supply it
Between without isolation, using part isolated form design can reduce cost under the premise of ensureing reliability.
The present invention adopts the following technical scheme that realization：A kind of part isolation based on two-way full-bridge DC/DC converters
Four Port Translation device of type, including two Boosts and a two-way full-bridge DC/DC converter, two Boosts and
One two-way full-bridge DC/DC converter forms four external connectivity ports, wherein and two ports connect photovoltaic generation unit,
A port connects energy-storage system, another port connects DC bus, Boost is used between photovoltaic generation unit and energy-storage system
Converter connects, and is connected with two-way full-bridge DC/DC converters between energy-storage system and DC bus.
A kind of above-mentioned four Port Translation device of part isolated form based on two-way full-bridge DC/DC converters, control method
Including photovoltaic generation unit control method and energy in bidirectional flow control method, have in energy in bidirectional flow control method including storage
It can system control method and two-way full-bridge DC/DC inverter control methods.
Photovoltaic generation unit control method is：Photovoltaic generation unit exit potential electric currentU pv、I pvMPPT modules are input to,
Duty ratio instruction is obtained through operation, the control signal of IGBT in Boost is obtained using PWM modulation, passes through control
The break-make of IGBT realizes photovoltaic maximal power tracing.
Energy storage system control method uses the voltage based on DC busU dcDroop control, to realize energy-storage system pair
The adjusting of busbar voltage, to avoidU dcTwo-way full-bridge DC/DC converters conducting when normal small range fluctuation, to DC bus-bar voltage
Carry out zonal control, settingU L2、U L1、U H1、U H2For the voltage threshold of energy-storage system charge/discharge operation, [U L1,U H1] it is two-way complete
Bridge DC/DC converters nonclient area, [U L2,U H2] be direct-current grid normal operation when busbar voltage allowable fluctuation range, pass through
DetectionU dc, the reference value of energy-storage system charge/discharge current can be calculated according to droop characteristicI ref, whenU L1≤U dc ≤U H1When, storage
Energy system is without charge and discharge；WhenU H1<U dc≤U H2When, energy-storage system charging；WhenU L2≤U dc <U L1When, energy storage system discharges.
Two-way full-bridge DC/DC inverter control methods are given with reference to electricity using single phase shift closed-loop control, first energy-storage system
PressureU dcrefWith DC bus-bar voltageU dcVoltage PI regulator is sent into compared to after, voltage PI regulator output valve passes through limiter
After obtain phase shift duty ratioD 1Value, then phase shift duty ratioD 1The PWM waveform Jing Guo phase shift is exported by phase-shift PWM generator
PWM modulation is carried out to the switching tube of two-way full-bridge DC/DC converters.
All above-mentioned four Port Translation devices of part isolation based on two-way full-bridge DC/DC converters provided by the present invention
And its control method, compared with prior art, possessed advantage is with good effect：（1）Pass through two-way full-bridge DC/DC
Converter can preferably match the different voltages grade between different port, and realize energy in bidirectional flow and electrical isolation.（2）Phase
For non-isolation type and isolated form multiport converter, isolated form four port transformer in part can meet making for most applications
With, and the use of switching tube can be reduced, save cost.（3）Two-way full-bridge DC/DC converters are conducive to energy using phase shifting control
Management optimization, while being easily achieved power switch tube Sofe Switch.（4）It is preferably matched by designing two photovoltaic input ports
With the transimission power of DC/DC converters.
Description of the drawings
Fig. 1 is the four Port Translation device structure chart of part isolated form the present invention is based on two-way full-bridge DC/DC converters.
Fig. 2 is four Port Translations device control block diagram involved in the present invention.
Fig. 3 is the energy stream cardon of four Port Translations device operating mode involved in the present invention, in figure：（a）Indicate photovoltaic hair
Electric unit provides energy to DC bus jointly with energy-storage system,（b）Indicate that photovoltaic generation unit is that energy-storage system and direct current are female
Line provides energy,（c）Indicate that photovoltaic generation unit does not generate electricity, energy-storage system provides energy to DC bus.
Specific implementation mode
A kind of four Port Translation device of part isolated form based on two-way full-bridge DC/DC converters, including two Boost transformation
Device and a two-way full-bridge DC/DC converter, two Boosts and a two-way full-bridge DC/DC converter form four
External connectivity port, wherein two ports connect photovoltaic generation unit, and a port connects energy-storage system, another port
Connect DC bus, connected with Boost between photovoltaic generation unit and energy-storage system, energy-storage system and DC bus it
Between with two-way full-bridge DC/DC converters connect.
The control method of the above-mentioned four Port Translation device of part isolated form based on two-way full-bridge DC/DC converters, tool
Body is unfolded as follows：Including photovoltaic generation unit control method and with energy in bidirectional flow control method, energy in bidirectional flow control
Have in method including energy storage system control method and two-way full-bridge DC/DC inverter control methods.
Photovoltaic generation unit control method：Photovoltaic generation unit works in maximal power tracing（MPPT）Pattern, photovoltaic list
Position exit potential electric currentU pv、I pvMPPT modules are input to, duty ratio instruction is obtained through operation, is obtained using PWM modulation
The control signal of IGBT in Boost, the break-make by controlling IGBT realize photovoltaic maximal power tracing.
Energy storage system control method：The charge and discharge of energy-storage system are the energy and direct current provided by photovoltaic generation unit
What the relation between supply and demand of energy needed for load determined, target is that DC bus-bar voltage is maintained to stablize.Energy-storage system passes through two-way full-bridge
DC/DC converters carry out energy exchange with DC bus, and converter uses the voltage based on DC busU dcDroop control, from
And realize adjusting of the energy-storage system to busbar voltage.To avoidU dcConverter is connected when normal small range fluctuation, to DC bus
Voltage carries out zonal control, settingU L2、U L1、U H1、U H2For the voltage threshold of energy-storage system charge/discharge operation, [U L1,U H1] it is to become
Parallel operation nonclient area, [U L2,U H2] be direct-current grid normal operation when busbar voltage allowable fluctuation range.Pass through detectionU dc, root
The reference value of energy-storage system charge/discharge current can be calculated according to droop characteristicI ref, whenU L1≤Udc≤U H1When, energy-storage system is not
Carry out charge/discharge；WhenU H1<U dc≤U H2When, energy-storage system charging；WhenU L2≤U dc <U L1When, energy storage system discharges.
Two-way full-bridge DC/DC inverter control methods are given with reference to electricity using single phase shift closed-loop control, first energy-storage system
PressureU dcrefWith DC bus-bar voltageU dcVoltage PI regulator is sent into compared to after, voltage PI regulator output valve passes through limiter
After obtain phase shift duty ratioD 1Value, then phase shift duty ratioD 1The PWM waveform Jing Guo phase shift is exported by phase-shift PWM generator
PWM modulation is carried out to the switching tube of two-way full-bridge converter.
Claims (2)
1. a kind of four Port Translation device of part isolated form based on two-way full-bridge DC/DC converters, it is characterised in that including two
Boost and a two-way full-bridge DC/DC converter, two Boosts and a two-way full-bridge DC/DC converter
Form four external connectivity ports, wherein two ports connect photovoltaic generation unit, and a port connects energy-storage system, separately
A port connects DC bus, is connected with Boost between photovoltaic generation unit and energy-storage system, energy-storage system and straight
It is connected with two-way full-bridge DC/DC converters between stream busbar.
2. a kind of four Port Translation device of part isolated form based on two-way full-bridge DC/DC converters according to claim 1,
It is characterized in that its control method includes photovoltaic generation unit control method and energy in bidirectional flow control method, energy bidirectional flow
Have in flowing control method including energy storage system control method and two-way full-bridge DC/DC inverter control methods；
Photovoltaic generation unit control method：Photovoltaic generation unit exit potential electric currentU pv、I pvMPPT modules are input to, are obtained through operation
It is instructed to duty ratio, the control signal of IGBT in Boost is obtained using PWM modulation, by the break-make for controlling IGBT
Realize photovoltaic maximal power tracing；
Energy storage system control method uses the voltage based on DC busU dcDroop control, to realize energy-storage system to busbar
The adjusting of voltage, to avoidU dcTwo-way full-bridge DC/DC converters conducting, carries out DC bus-bar voltage when normal small range fluctuation
Zonal control, settingU L2、U L1、U H1、U H2For the voltage threshold of energy-storage system charge/discharge operation, [U L1,U H1] it is two-way full-bridge
DC/DC converters nonclient area, [U L2,U H2] be direct-current grid normal operation when busbar voltage allowable fluctuation range, pass through inspection
It surveysU dc, the reference value of energy-storage system charge/discharge current can be calculated according to droop characteristicI ref, whenU L1≤U dc ≤U H1When, energy storage
System is without charge and discharge；WhenU H1<U dc≤U H2When, energy-storage system charging；WhenU L2≤U dc <U L1When, energy storage system discharges；
Two-way full-bridge DC/DC inverter control methods give reference voltage using single phase shift closed-loop control, first energy-storage systemU dcrefWith DC bus-bar voltageU dcVoltage PI regulator is sent into compared to after, voltage PI regulator output valve is after limiter
Obtain phase shift duty ratioD 1Value, then phase shift duty ratioD 1The PWM waveform pair Jing Guo phase shift is exported by phase-shift PWM generator
The switching tube of two-way full-bridge DC/DC converters carries out PWM modulation.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109038533A (en) * | 2018-09-01 | 2018-12-18 | 哈尔滨工程大学 | A method of distribution division power auto-control is realized based on three Port Translation devices |
| CN109066646A (en) * | 2018-09-01 | 2018-12-21 | 哈尔滨工程大学 | A kind of control strategy for realizing the regulation of polygamy electricity subregion electric energy flexibility based on decoupling multiport |
| CN109066647A (en) * | 2018-09-01 | 2018-12-21 | 哈尔滨工程大学 | A kind of half is isolated four port hybrid energy storage devices and control method |
| CN109687489A (en) * | 2018-12-05 | 2019-04-26 | 厦门科华恒盛股份有限公司 | The control method, system and terminal device of energy storage device output power in micro-capacitance sensor |
| CN110212776A (en) * | 2019-06-14 | 2019-09-06 | 哈尔滨工业大学 | A kind of three port DC-DC converter of hybrid energy-storing and its power distribution control method |
| CN110336268A (en) * | 2019-05-07 | 2019-10-15 | 国网湖南省电力有限公司 | Charge/discharge control method for energy storage reversible transducer |
| CN110943641A (en) * | 2019-11-22 | 2020-03-31 | 燕山大学 | Pulse width modulation method of current type three-phase high-frequency link matrix inverter |
| CN113937751A (en) * | 2021-10-19 | 2022-01-14 | 国网山西省电力公司电力科学研究院 | Direct-current micro-grid group power coordination control method and system |
| US11817701B2 (en) | 2021-01-29 | 2023-11-14 | Eaton Intelligent Power Limited | Multi-port split-phase power system |
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| CN109066646B (en) * | 2018-09-01 | 2021-10-26 | 哈尔滨工程大学 | Control method for realizing flexible regulation and control of multi-distribution-partition electric energy based on decoupling multiple ports |
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| CN109066647A (en) * | 2018-09-01 | 2018-12-21 | 哈尔滨工程大学 | A kind of half is isolated four port hybrid energy storage devices and control method |
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| CN109687489A (en) * | 2018-12-05 | 2019-04-26 | 厦门科华恒盛股份有限公司 | The control method, system and terminal device of energy storage device output power in micro-capacitance sensor |
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| CN110212776A (en) * | 2019-06-14 | 2019-09-06 | 哈尔滨工业大学 | A kind of three port DC-DC converter of hybrid energy-storing and its power distribution control method |
| CN110943641A (en) * | 2019-11-22 | 2020-03-31 | 燕山大学 | Pulse width modulation method of current type three-phase high-frequency link matrix inverter |
| CN110943641B (en) * | 2019-11-22 | 2021-09-07 | 燕山大学 | Pulse width modulation method of current type three-phase high-frequency link matrix inverter |
| US11817701B2 (en) | 2021-01-29 | 2023-11-14 | Eaton Intelligent Power Limited | Multi-port split-phase power system |
| CN113937751A (en) * | 2021-10-19 | 2022-01-14 | 国网山西省电力公司电力科学研究院 | Direct-current micro-grid group power coordination control method and system |
| CN113937751B (en) * | 2021-10-19 | 2023-09-26 | 国网山西省电力公司电力科学研究院 | Direct-current micro-grid group power coordination control method and system |
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