CN107947572A - A kind of series hybrid multiport DC/DC converters suitable for energy-storage units access - Google Patents
A kind of series hybrid multiport DC/DC converters suitable for energy-storage units access Download PDFInfo
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- CN107947572A CN107947572A CN201711309003.3A CN201711309003A CN107947572A CN 107947572 A CN107947572 A CN 107947572A CN 201711309003 A CN201711309003 A CN 201711309003A CN 107947572 A CN107947572 A CN 107947572A
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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
-
- 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
Abstract
A kind of series hybrid multiport DC/DC converters suitable for energy-storage units access, including unidirectional boosting DC/DC converters, the two-way DC/DC units of tandem type, the unidirectional boosting DC/DC converters include power supply U1, inductance L1, switching tube S1, diode DO, capacitance CO；Power supply U1Cathode connection inductance L1One end, inductance L1Other end connecting valve pipe S1Drain electrode, the two-way DC/DC units side of tandem type, power supply U1Anode connecting valve pipe S1Source electrode, capacitance COOne end, capacitance COOther end connection diode DOCathode, diode DOAnode connects the two-way DC/DC units opposite side of tandem type；The two-way DC/DC units of tandem type are multiple, and multiple two-way DC/DC units of tandem type are in series or in parallel.The present invention is by improving the structures of two-way DC/DC converters, it is proposed that the Constructed wetlands and implementation of a kind of two-way DC/DC units topology of tandem type and series hybrid MPC, realize energy-storage units series connection access, have the advantages that simple structure, convenient control.
Description
Technical field
The present invention relates to a kind of DC/DC converters, specifically a kind of series hybrid suitable for energy-storage units access
Multiport DC/DC converters.
Background technology
With the getting worse of the global problems such as energy crisis, greenhouse effects and atmosphere pollution, photovoltaic generation, fuel electricity
The new energy power generation technologies such as pond power generation have obtained extensive concern and fast development, the grid-connected power generation system energy containing energy-storage units
The generated output of enough smooth new energy micro batteries, improves system grid connection stability.Existing parallel connection mixed type multiport converter
Energy-storage units are generally connected in the form of in parallel with boosting DC/DC converters or dc bus in scheme, and traditional is parallel
Although structure can solve the problems, such as micro battery generated output and it is grid-connected when system stability, due to parallel structure
Reason makes energy-storage system to carry out electric energy conversion twice when charging every time, causes waste of energy and utilization rate of electrical is low etc. asks
Topic, in addition parallel structure can also increase the complexity of system design cost and controller design.Therefore, existing parallel connection is improved
Formula structure is for reducing energy-storage system energy conversion times, improving system capacity utilization rate, reduction system design cost and optimization
Controller design is of great significance.
The content of the invention
In view of the above shortcomings of the prior art, energy is changed caused by emphasis of the present invention solves energy-storage units parallel structure
Often, a kind of problems such as capacity usage ratio is low, it is proposed that series hybrid multiport DC/DC suitable for energy-storage units access
Converter.A kind of structure of the invention by improving two-way DC/DC converters, it is proposed that two-way DC/DC units topology of tandem type
And the Constructed wetlands and implementation of series hybrid MPC, energy-storage units series connection access is realized, there is simple in structure, control
The advantages that facilitating is made, compared with conventional parallel mixed type MPC, the program can significantly reduce the energy conversion time of energy-storage units
Number, so as to reduce energy loss, improves the utilization rate of energy.
The technical solution that the present invention takes is：
A kind of series hybrid multiport DC/DC converters suitable for energy-storage units access, including unidirectional boosting DC/DC
The two-way DC/DC units of converter, tandem type, the unidirectional boosting DC/DC converters include power supply U1, inductance L1, switching tube S1、
Diode DO, capacitance CO；Power supply U1Cathode connection inductance L1One end, inductance L1Other end connecting valve pipe S1Drain electrode, tandem type are double
To DC/DC units side, power supply U1Anode connecting valve pipe S1Source electrode, capacitance COOne end, capacitance COOther end connection diode DO
Cathode, diode DOAnode connects the two-way DC/DC units opposite side of tandem type；
The two-way DC/DC units of tandem type include energy-storage units UB, switching tube S2, switching tube S3, diode D1, two poles
Pipe D2；
Switching tube S2Drain electrode connection diode D1Anode, diode D1Cathode connecting valve pipe S3Drain electrode, switching tube S3Source electrode
Connect diode D2Cathode, diode D2Anode connecting valve pipe S2Source electrode, energy-storage units UBCathode connecting diode D1Cathode,
Energy-storage units UBAnode connection diode D2Anode；
The two-way DC/DC units of tandem type are multiple, and multiple two-way DC/DC units of tandem type are in series or in parallel.String
The two-way DC/DC units of connection type are by three switching tubes：Switching tube S2, switching tube S3With two diodes：Diode D1, diode D2,
Respectively constitute charging paths, discharge paths and the bypass of two-way DC/DC converters；
As switching tube S1、S2When being turned off, diode D1、D2Conducting, energy-storage units UBIn charged state；
As switching tube S1、S2Conducting, diode D1、D2Shut-off, energy-storage units are in discharge condition；
As switching tube S1、S2During an only switching tube conducting, energy-storage units are bypassed, and the energy being not involved in circuit turns
Change；In series hybrid MPC, by by the two-way DC/DC units of multiple tandem types carry out respectively it is in series or in parallel after, again with list
Connect to boosting DC/DC converters, it is possible to achieve N (N >=1) a energy-storage units access at the same time.
A kind of street lamp illumination system, the unidirectional boosting DC/DC converters of photovoltaic cell connection, the unidirectional DC/DC converters that boost
It is connected with the two-way DC/DC units of tandem type, the two-way DC/DC units connection dc bus of tandem type；
Dc bus connects two-way DC/AC converters, and two-way DC/AC converters connect AC network；
Dc bus connects DC/AC converters, DC/AC converters connection AC load；
Dc bus connects DC/DC converters, DC/DC converters connection DC load.
A kind of series hybrid multiport DC/DC converters suitable for energy-storage units access of the present invention, have has as follows
Beneficial effect：
1. energy-storage units are linked into unidirectional boosting DC/DC converters by the present invention in the form of connecting, make energy-storage units
One complete power electronic system is formed by the two-way DC/DC units of tandem type and unidirectional boosting DC/DC converters, is reduced
The design cost of converter, while the design difficulty of controller can also be reduced, make centralized Control simpler.
2. energy-storage units and unidirectional boosting DC/DC converters can be cascaded by the two-way DC/DC units of tandem type.Energy storage
In charging process, electric energy can be directly transformed into energy-storage units unit by the DC/DC converters that unidirectionally boost, reduce energy by
Boosting DC/DC converters are transmitted to load, then energy is transformed into this roundabout process in energy-storage units by loading, thus reduce
The conversion times of energy, improve the utilization rate of energy.
Brief description of the drawings
The invention will be further described with reference to the accompanying drawings and examples：
Fig. 1 is conventional parallel mixed type MPC functional block diagrams.
Fig. 2 is series hybrid MPC functional block diagrams of the present invention.
Fig. 3 is that the present invention is mixed applied to the series connection of formation one in parallel of the two-way DC/DC units of N number of tandem type in Boost
Mould assembly MPC schematic diagrams.
The present invention is applied to N number of two-way DC/DC units of tandem type in Boost and connects to form a series connection and mix during Fig. 4
Mould assembly MPC schematic diagrams.
Fig. 5 is that the present invention is applied to 1 tandem type in Boost, one MPC schematic diagrams of two-way DC/DC units formation.
Fig. 6 is the two-way DC/DC element circuits figure of single tandem type of the present invention.
Embodiment
A kind of series hybrid multiport DC/DC converters suitable for energy-storage units access, including unidirectional boosting DC/DC
The two-way DC/DC units of converter, tandem type, the unidirectional boosting DC/DC converters include power supply U1, inductance L1, switching tube S1、
Diode DO, capacitance CO；Power supply U1Cathode connection inductance L1One end, inductance L1Other end connecting valve pipe S1Drain electrode, tandem type are double
To DC/DC units side, power supply U1Anode connecting valve pipe S1Source electrode, capacitance COOne end, capacitance COOther end connection diode DO
Cathode, diode DOAnode connects the two-way DC/DC units opposite side of tandem type；The two-way DC/DC units of tandem type include storage
Can unit UB, switching tube S2, switching tube S3, diode D1, diode D2；
Switching tube S2Drain electrode connection diode D1Anode, diode D1Cathode connecting valve pipe S3Drain electrode, switching tube S3Source electrode
Connect diode D2Cathode, diode D2Anode connecting valve pipe S2Source electrode, energy-storage units UBCathode connecting diode D1Cathode, storage
Can unit UBAnode connection diode D2Anode；
The two-way DC/DC units of tandem type are multiple, and multiple two-way DC/DC units of tandem type are in series or in parallel.
The two-way DC/DC units of tandem type are by three switching tubes：Switching tube S2, switching tube S3With two diodes：Diode
D1, diode D2, respectively constitute charging paths, discharge paths and the bypass of two-way DC/DC converters；
As switching tube S1、S2When being turned off, diode D1、D2Conducting, energy-storage units UBIn charged state；DC micro-electric source
When charging to energy-storage units, directly charged by series hybrid MPC to energy-storage units, it is not necessary to be converted to DC bus-bar voltage
Charged again by two-way DC/DC converters to energy-storage units afterwards, thus reduce the conversion of intergrade energy, improve energy utilization
Efficiency.
As switching tube S1、S2Conducting, diode D1、D2Shut-off, energy-storage units are in discharge condition；
As switching tube S1、S2During an only switching tube conducting, energy-storage units are bypassed, and the energy being not involved in circuit turns
Change；In series hybrid MPC, by by the two-way DC/DC units of multiple tandem types carry out respectively it is in series or in parallel after, again with list
Connect to boosting DC/DC converters, it is possible to achieve N (N >=1) a energy-storage units access at the same time.
A kind of street lamp illumination system, the unidirectional boosting DC/DC converters of photovoltaic cell connection, the unidirectional DC/DC converters that boost
It is connected with the two-way DC/DC units of tandem type, the two-way DC/DC units connection dc bus of tandem type；
Dc bus connects two-way DC/AC converters, and two-way DC/AC converters connect AC network；
Dc bus connects DC/AC converters, DC/AC converters connection AC load；
Dc bus connects DC/DC converters, DC/DC converters connection DC load.
The present invention is described in further detail with reference to the accompanying drawings and detailed description.
Fig. 1 and Fig. 2 is respectively conventional parallel mixed type MPC functional block diagrams and series hybrid MPC proposed by the present invention
Functional block diagram, as shown in Figure 1 energy-storage units be connected directly with dc bus, with unidirectional boosting DC/DC converters formed it is a kind of simultaneously
Connection formula structure, in energy-storage units charging process, electric energy in DC micro-electric source is first by the DC/DC converters that boost by voltage
DC bus-bar voltage is increased to, then redundancy electric energy is stored into by energy storage by the two-way DC/DC converter in parallel with dc bus
In unit, thus DC micro-electric source will change in energy-storage units charging process by electric energy twice, and electric energy conversion times are more,
The problem such as cause waste of energy, utilization rate of electrical low.According to the problem above present invention by improving two-way DC/DC converters knot
Structure, proposes a kind of series hybrid multiport MPC, becomes as shown in Fig. 2, series hybrid MPC realizes unidirectional boosting DC/DC
Parallel operation is connected with two-way DC/DC converters, reduces DC micro-electric source in energy-storage units charging process, electric energy is converted to directly
This process of stream busbar voltage, so as to reduce electric energy conversion times, improves utilization rate of electrical.
It is illustrated in figure 3 the present invention and is applied to the N number of two-way DC/DC units of tandem type formation one in parallel in Boost
Series hybrid MPC schematic diagrams, the tandem type mixed type MPC by by the two-way DC/DC units of N number of tandem type it is in parallel after again with
Boost is connected, and forms a series hybrid MPC with N+2 port, series hybrid MPC can be at the same time
Realize that each energy-storage units of N and 1 new energy micro battery access at the same time, can work independently between each energy-storage units, not do mutually
Disturb.Series hybrid MPC can not only reduce energy-storage units in charging process since electric energy conversion times are more, caused by electricity
Problem can be wasted, and the form of N number of energy-storage units parallel connection is greatly improved into system power capacity and system grid connection stability.
The present invention is illustrated in figure 4 to connect to form one applied to N number of two-way DC/DC units of tandem type in Boost
Series hybrid MPC schematic diagrams, series hybrid MPC is by by the two-way DC/DC units of N number of tandem type and Boost circuit string
Connection, forms a series hybrid MPC with N+2 port, and N number of energy-storage units can simultaneously or separately carry out charge and discharge
Electricity.
It is illustrated in figure 5 the present invention and is applied to the two-way DC/DC units formation one MPC originals of 1 tandem type in Boost
Reason figure, the circuit can be divided into three operation modes：Energy-storage units charging mode, energy-storage units electric discharge mode and energy-storage units are other
Road mode；
Mode one：Switch S1、S2、S3It is turned off, at this time diode D1、D2、DOIt is both turned on, power supply U1By inductance L to storage
Can unit UBCharging, while capacitance COCharging, to load RLPower supply.
Mode two：Switch S1Shut-off, S2、S3Conducting, diode D1、D2Shut-off, DOConducting, energy-storage units are in electric discharge shape
State, power supply U1And UBGive capacitance C at the same timeOCharging.
Mode three：The mode can be divided into two kinds of working condition：(1) S is switched1Shut-off, S2Conducting, S3Shut-off (or S2
Shut-off, S3Conducting), diode D1(or D2) turn on, DOTurn on, energy-storage units are in and are bypassed state at this time, load by power supply U1
Individually power supply；(2) S is switched1Conducting, S2、S3It is turned off, diode D1、D1、DOIt is turned off, inductance L charges at this time, CODischarge and be
Load supplying, energy-storage units still in state is bypassed, change by the energy being not involved in circuit.
In conclusion the present invention realizes energy-storage units series connection access by the two-way DC/DC units of tandem type, it is proposed that one
Kind series hybrid MPC topological structures and its building method, series hybrid MPC effectively solve traditional energy-storage units
It is more by energy conversion times caused by two-way DC/DC converters parallel structure, the problem of capacity usage ratio is low.The present invention
Suitable for the direct-current grid containing energy-storage units, above-mentioned implementation example illustrates simple and structure just for the sake of operation principle
Series hybrid MPC, in practical applications, can be slightly modified to this programme according to actual conditions, reaches optimization efficiency and section
The about purpose of cost.
The above-mentioned implementation example of the present invention is only example to illustrate the invention, and is not the reality to the present invention
Apply the restriction of mode.For those of ordinary skill in the field, other can also be made on the basis of the above description
Various forms of changes and variation.Here all embodiments can not be exhaustive.Every technical side for belonging to the present invention
Row of the case changes and variations that derived from still in protection scope of the present invention.
Claims (4)
1. a kind of series hybrid multiport DC/DC converters suitable for energy-storage units access, including unidirectional boosting DC/DC become
The two-way DC/DC units of parallel operation, tandem type, it is characterised in that：The unidirectional boosting DC/DC converters include power supply U1, inductance L1、
Switching tube S1, diode DO, capacitance CO；Power supply U1Cathode connection inductance L1One end, inductance L1Other end connecting valve pipe S1Drain electrode,
The two-way DC/DC units side of tandem type, power supply U1Anode connecting valve pipe S1Source electrode, capacitance COOne end, capacitance COThe other end connects
Diode DOCathode, diode DOAnode connects the two-way DC/DC units opposite side of tandem type；The two-way DC/DC units of tandem type
Including energy-storage units UB, switching tube S2, switching tube S3, diode D1, diode D2；Switching tube S2Drain electrode connection diode D1Sun
Pole, diode D1Cathode connecting valve pipe S3Drain electrode, switching tube S3Source electrode connection diode D2Cathode, diode D2Anode connection is opened
Close pipe S2Source electrode, energy-storage units UBCathode connecting diode D1Cathode, energy-storage units UBAnode connection diode D2Anode；
The two-way DC/DC units of tandem type are multiple, and multiple two-way DC/DC units of tandem type are in series or in parallel.
2. a kind of series hybrid multiport DC/DC converters suitable for energy-storage units access according to claim 1, its
It is characterized in that：The two-way DC/DC units of tandem type are by three switching tubes：Switching tube S2, switching tube S3With two diodes：Diode
D1, diode D2, respectively constitute charging paths, discharge paths and the bypass of two-way DC/DC converters；
As switching tube S1、S2When being turned off, diode D1、D2Conducting, energy-storage units UBIn charged state；
As switching tube S1、S2Conducting, diode D1、D2Shut-off, energy-storage units are in discharge condition；
As switching tube S1、S2During an only switching tube conducting, energy-storage units are bypassed, the energy conversion being not involved in circuit.
3. a kind of series hybrid multiport DC/DC converters suitable for energy-storage units access according to claim 1, its
It is characterized in that：In series hybrid MPC, by by the two-way DC/DC units of multiple tandem types carry out respectively it is in series or in parallel after,
Connect again with unidirectional boosting DC/DC converters, it is possible to achieve N (N >=1) a energy-storage units access at the same time.
4. using the series hybrid multiport DC/DC that any one is accessed suitable for energy-storage units as described in claim 1-3
A kind of street lamp illumination system of converter, it is characterised in that：The unidirectional boosting DC/DC converters of photovoltaic cell connection, unidirectional boosting
DC/DC converters are connected with the two-way DC/DC units of tandem type, the two-way DC/DC units connection dc bus of tandem type；Dc bus
Two-way DC/AC converters are connected, two-way DC/AC converters connect AC network；
Dc bus connects DC/AC converters, DC/AC converters connection AC load；
Dc bus connects DC/DC converters, DC/DC converters connection DC load.
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Cited By (7)
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| CN109383530A (en) * | 2018-12-05 | 2019-02-26 | 中车长春轨道客车股份有限公司 | A kind of motor-car trailer system that emergency is walked certainly |
| CN109599934A (en) * | 2018-12-27 | 2019-04-09 | 哈尔滨工业大学（深圳） | Multiport power cell expandable type photovoltaic charger |
| CN110838791A (en) * | 2019-11-19 | 2020-02-25 | 西南交通大学 | Two-switch three-port direct current converter and control method and circuit thereof |
| CN110855145A (en) * | 2019-11-19 | 2020-02-28 | 西南交通大学 | Three-port direct current converter and control method and circuit thereof |
| CN110855144A (en) * | 2019-11-19 | 2020-02-28 | 西南交通大学 | Non-isolated three-port direct current converter and control method and circuit thereof |
| CN113113963A (en) * | 2021-03-11 | 2021-07-13 | 三峡大学 | Digital iron tower on-line monitoring device multi-source self-power supply system based on three-port commutation |
| US11909314B2 (en) | 2021-11-26 | 2024-02-20 | City University Of Hong Kong | Reconfigurable single-inductor multiport converter |
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| CN113113963A (en) * | 2021-03-11 | 2021-07-13 | 三峡大学 | Digital iron tower on-line monitoring device multi-source self-power supply system based on three-port commutation |
| US11909314B2 (en) | 2021-11-26 | 2024-02-20 | City University Of Hong Kong | Reconfigurable single-inductor multiport converter |
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