CN107947572B - A kind of series hybrid multiport DC/DC converter suitable for energy-storage units access - Google Patents

A kind of series hybrid multiport DC/DC converter suitable for energy-storage units access Download PDF

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Publication number
CN107947572B
CN107947572B CN201711309003.3A CN201711309003A CN107947572B CN 107947572 B CN107947572 B CN 107947572B CN 201711309003 A CN201711309003 A CN 201711309003A CN 107947572 B CN107947572 B CN 107947572B
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converter
energy
way
diode
storage units
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CN107947572A (en
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邾玢鑫
陈耀
王辉
曾庆典
李圣乾
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Wuhan Xinyuan Automatic Control Engineering Co.,Ltd.
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China Three Gorges University CTGU
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/02Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10Conversion 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
    • H02M3/145Conversion 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
    • H02M3/155Conversion 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
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/35Parallel 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 converter suitable for energy-storage units access, including the two-way DC/DC unit of unidirectionally boost DC/DC converter, tandem type, the unidirectional boosting DC/DC converter includes power supply U1, inductance L1, switching tube S1, diode DO, capacitor CO;Power supply U1Anode connection inductance L1One end, inductance L1Other end connection switch pipe S1Drain electrode, tandem type two-way DC/DC unit side, power supply U1Cathode connection switch pipe S1Source electrode, capacitor COOne end, capacitor COThe other end connects diode DOCathode, diode DOAnode connects the tandem type two-way DC/DC unit other side;The two-way DC/DC unit of tandem type be it is multiple, multiple two-way DC/DC units of tandem type are in series or in parallel.The present invention proposes a kind of two-way DC/DC unit topology of tandem type and the Constructed wetlands and implementation of series hybrid MPC, realizes energy-storage units series connection access, have many advantages, such as simple structure, convenient control by improving the structure of two-way DC/DC converter.

Description

A kind of series hybrid multiport DC/DC converter suitable for energy-storage units access
Technical field
The present invention relates to a kind of DC/DC converter, specifically a kind of series hybrid suitable for energy-storage units access Multiport DC/DC converter.
Background technique
With getting worse for the global problems such as energy crisis, greenhouse effects and atmosphere pollution, photovoltaic power 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 form in parallel with boosting DC/DC converter or DC bus in scheme, and traditional is parallel Structure be although able to solve micro battery generated output and it is grid-connected when system stability the problem of, but due to parallel structure Reason will carry out electric energy conversion twice when energy-storage system being made to charge every time, cause waste of energy and utilization rate of electrical is low etc. asks Topic, in addition parallel structure also will 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.
Summary of the invention
In view of the above shortcomings of the prior art, emphasis of the present invention solves the conversion of energy caused by energy-storage units parallel structure Often, the problems such as capacity usage ratio is low proposes a kind of series hybrid multiport DC/DC suitable for energy-storage units access Converter.The present invention proposes a kind of two-way DC/DC unit topology of tandem type by the structure of the two-way DC/DC converter of improvement And the Constructed wetlands and implementation of series hybrid MPC, realize energy-storage units series connection access, control simple with structure 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, to reduce energy loss, improves the utilization rate of energy.
The technical scheme adopted by the invention is as follows:
A kind of series hybrid multiport DC/DC converter suitable for energy-storage units access, including the DC/DC that unidirectionally boosts The two-way DC/DC unit of converter, tandem type, the unidirectional boosting DC/DC converter includes power supply U1, inductance L1, switching tube S1、 Diode DO, capacitor CO;Power supply U1Anode connection inductance L1One end, inductance L1Other end connection switch pipe S1Drain electrode, tandem type are double To DC/DC unit side, power supply U1Cathode connection switch pipe S1Source electrode, capacitor COOne end, capacitor COThe other end connects diode DO Cathode, diode DOAnode connects the tandem type two-way DC/DC unit other side;
The two-way DC/DC unit of tandem type includes 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 connection switch pipe S3Drain electrode, switching tube S3Source electrode Connect diode D2Cathode, diode D2Anode connection switch pipe S2Source electrode, energy-storage units UBCathode connecting diode D1Cathode, storage It can unit UBCathode connects diode D2Anode;
The two-way DC/DC unit of tandem type be it is multiple, multiple two-way DC/DC units of tandem type are in series or in parallel.String The two-way DC/DC unit of connection type is 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 converter;
As switching tube S2、S3When being turned off, diode D1、D2Conducting, energy-storage units UBIn charged state;
As switching tube S2、S3Conducting, diode D1、D2Shutdown, energy-storage units are in discharge condition;
As switching tube S2、S3When only one switching tube is connected, energy-storage units are bypassed, and the energy being not involved in circuit turns It changes;
In series hybrid MPC, by by the two-way DC/DC unit of multiple tandem types carry out respectively it is in series or in parallel after, It connects again with unidirectional boosting DC/DC converter, a energy-storage units of N (N >=1) may be implemented while accessing.
A kind of street lamp illumination system, the unidirectional boosting DC/DC converter of photovoltaic cell connection, the unidirectional DC/DC converter that boosts It is connect with the two-way DC/DC unit of tandem type, the two-way DC/DC unit of tandem type connects DC bus;
DC bus connects two-way DC/AC converter, and two-way DC/AC converter connects AC network;
DC bus connects DC/AC converter, and DC/AC converter connects AC load;
DC bus connects DC/DC converter, and DC/DC converter connects DC load.
A kind of series hybrid multiport DC/DC converter 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 converter by the present invention in the form of concatenated, make energy-storage units A complete power electronic system is formed by the two-way DC/DC unit of tandem type and unidirectional boosting DC/DC converter, is reduced The design cost of converter, while the design difficulty of controller can also be reduced, keep centralized control simpler.
2. energy-storage units and unidirectional boosting DC/DC converter can be cascaded by the two-way DC/DC unit of tandem type.Energy storage During the charging process, electric energy can be directly transformed into energy-storage units by the DC/DC converter that unidirectionally boosts unit, reduce energy by Boosting DC/DC converter is transmitted to load, then energy is transformed into this roundabout process in energy-storage units by loading, thus reduces The conversion times of energy improve the utilization rate of energy.
Detailed description of the invention
The utility model is described in further detail with reference to the accompanying drawings and examples:
Fig. 1 is conventional parallel mixed type MPC functional block diagram.
Fig. 2 is series hybrid MPC functional block diagram of the present invention.
Fig. 3 is that the present invention is mixed applied to two-way one series connection of DC/DC unit parallel connection formation of tandem type N number of in Boost Mould assembly MPC schematic diagram.
The present invention is applied to N number of two-way DC/DC unit of tandem type in Boost and connects that form a series connection mixed when Fig. 4 Mould assembly MPC schematic diagram.
Fig. 5 is that the present invention is applied to 1 tandem type in Boost, one MPC schematic diagram of two-way DC/DC unit formation.
Fig. 6 is the two-way DC/DC element circuit figure of single tandem type of the present invention.
Specific embodiment
A kind of series hybrid multiport DC/DC converter suitable for energy-storage units access, including the DC/DC that unidirectionally boosts The two-way DC/DC unit of converter, tandem type, the unidirectional boosting DC/DC converter includes power supply U1, inductance L1, switching tube S1、 Diode DO, capacitor CO;Power supply U1Anode connection inductance L1One end, inductance L1Other end connection switch pipe S1Drain electrode, tandem type are double To DC/DC unit side, power supply U1Cathode connection switch pipe S1Source electrode, capacitor COOne end, capacitor COThe other end connects diode DO Cathode, diode DOAnode connects the tandem type two-way DC/DC unit other side;The two-way DC/DC unit of tandem type includes storage It can unit UB, switching tube S2, switching tube S3, diode D1, diode D2
Switching tube S2Drain electrode connection diode D1Anode, diode D1Cathode connection switch pipe S3Drain electrode, switching tube S3Source electrode Connect diode D2Cathode, diode D2Anode connection switch pipe S2Source electrode, energy-storage units UBCathode connecting diode D1Cathode, storage It can unit UBCathode connects diode D2Anode;
The two-way DC/DC unit of tandem type be it is multiple, multiple two-way DC/DC units of tandem type are in series or in parallel.
The two-way DC/DC unit of tandem type is 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 converter;
As switching tube S2、S3When being turned off, diode D1、D2Conducting, energy-storage units UBIn charged state;DC micro-electric source When charging to energy-storage units, is directly charged by series hybrid MPC to energy-storage units, do not need to be converted to DC bus-bar voltage It is charged again by two-way DC/DC converter to energy-storage units afterwards, thus reduces the conversion of intergrade energy, improve energy utilization Efficiency.
As switching tube S2、S3Conducting, diode D1、D2Shutdown, energy-storage units are in discharge condition;
As switching tube S2、S3When only one switching tube is connected, energy-storage units are bypassed, and the energy being not involved in circuit turns It changes;
In series hybrid MPC, by by the two-way DC/DC unit of multiple tandem types carry out respectively it is in series or in parallel after, It connects again with unidirectional boosting DC/DC converter, a energy-storage units of N (N >=1) may be implemented while accessing.
A kind of street lamp illumination system, the unidirectional boosting DC/DC converter of photovoltaic cell connection, the unidirectional DC/DC converter that boosts It is connect with the two-way DC/DC unit of tandem type, the two-way DC/DC unit of tandem type connects DC bus;
DC bus connects two-way DC/AC converter, and two-way DC/AC converter connects AC network;
DC bus connects DC/AC converter, and DC/AC converter connects AC load;
DC bus connects DC/DC converter, and DC/DC converter connects DC load.
Invention is further described in detail with reference to the accompanying drawings and detailed description.
Fig. 1 and Fig. 2 is respectively conventional parallel mixed type MPC functional block diagram and series hybrid MPC proposed by the present invention Functional block diagram, energy-storage units are connected directly with DC bus as shown in Figure 1, form one kind simultaneously with unidirectional boosting DC/DC converter Connection formula structure, in energy-storage units charging process, the electric energy in DC micro-electric source passes through boosting DC/DC converter for voltage first It is increased to DC bus-bar voltage, then redundancy electric energy is stored by energy storage by the two-way DC/DC converter in parallel with DC bus In unit, thus DC micro-electric source will convert in giving energy-storage units charging process by electric energy twice, and electric energy conversion times are more, Cause waste of energy, the problems such as utilization rate of electrical is low.According to the problem above present invention by improving two-way DC/DC converter 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 converter, reduces DC micro-electric source in energy-storage units charging process, electric energy is converted to directly It flows this process of busbar voltage and improves utilization rate of electrical to reduce electric energy conversion times.
It is illustrated in figure 3 the present invention and is applied to N number of two-way DC/DC unit parallel connection formation one of tandem type in Boost Series hybrid MPC schematic diagram, the tandem type mixed type MPC by by the two-way DC/DC unit of N number of tandem type it is in parallel after again with Boost series connection forms the series hybrid MPC with N+2 port, and series hybrid MPC can be simultaneously It realizes that each energy-storage units of N and 1 new energy micro battery access simultaneously, can work independently between each energy-storage units, not do mutually It disturbs.Series hybrid MPC can not only reduce energy-storage units during the 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 unit of tandem type in Boost Series hybrid MPC schematic diagram, series hybrid MPC is by by the two-way DC/DC unit of N number of tandem type and Boost circuit string Connection, forms the 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 unit formation one MPC original 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 It can unit UBCharging, while capacitor COCharging, to load RLPower supply.
Mode two: switch S1Shutdown, S2、S3Conducting, diode D1、D2Shutdown, DOConducting, energy-storage units are in electric discharge shape State, power supply U1And UBCapacitor C is given simultaneouslyOCharging.
Mode three: the mode can be divided into two kinds of working condition: (1) switch S1Shutdown, S2Conducting, S3Shutdown (or S2It closes Disconnected, S3Conducting), diode D1(or D2) conducting, DOConducting, energy-storage units are in the state that is bypassed at this time, load by power supply U1It is single Solely power supply;(2) switch S1Conducting, S2、S3It is turned off, diode D1、D1、DOIt is turned off, inductance L charges at this time, COElectric discharge is negative Power supply is carried, energy-storage units still in state is bypassed, convert 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 unit of tandem type, one is proposed Kind of series hybrid MPC topological structure and its building method, the traditional energy-storage units of series hybrid MPC effective solution It is more by energy conversion times brought by two-way DC/DC converter parallel structure, the low problem of capacity usage ratio.The present invention Suitable for the direct-current grid containing energy-storage units, above-mentioned implementation example illustrates simple and building just for the sake of working principle Series hybrid MPC in practical applications can be slightly modified to this programme according to the actual situation, reaches optimization efficiency and section The about purpose of cost.
Above-mentioned implementation example of the invention is only example to illustrate the invention, and is not to reality of the invention Apply the restriction of mode.For those of ordinary skill in the art, other can also be made on the basis of the above description Various forms of variations and variation.Here all embodiments can not be exhaustive.It is all to belong to technical side of the invention Case changes and variations that derived from are still in the scope of protection of the present invention.

Claims (3)

1. a kind of series hybrid multiport DC/DC converter suitable for energy-storage units access, including DC/DC change of unidirectionally boosting The two-way DC/DC unit of parallel operation, tandem type, it is characterised in that: the unidirectional boosting DC/DC converter includes power supply U1, inductance L1、 Switching tube S1, diode DO, capacitor CO;Power supply U1Anode connection inductance L1One end, inductance L1Other end connection switch pipe S1Drain electrode, Tandem type two-way DC/DC unit side, power supply U1Cathode connection switch pipe S1Source electrode, capacitor COOne end, capacitor COOther end connection Diode DOCathode, diode DOAnode connects the tandem type two-way DC/DC unit other side;The two-way DC/DC unit 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 connection switch pipe S3Drain electrode, switching tube S3Source electrode connects diode D2Cathode, diode D2Anode connection is opened Close pipe S2Source electrode, energy-storage units UBCathode connecting diode D1Cathode, energy-storage units UBCathode connects diode D2Anode;
The two-way DC/DC unit of tandem type be it is multiple, multiple two-way DC/DC units of tandem type are in series or in parallel;
The two-way DC/DC unit of tandem type is by three switching tubes: switching tube S2, switching tube S3With two diodes: diode D1, two Pole pipe D2, respectively constitute charging paths, discharge paths and the bypass of two-way DC/DC converter;
As switching tube S2、S3When being turned off, diode D1、D2Conducting, energy-storage units UBIn charged state;
As switching tube S2、S3Conducting, diode D1、D2Shutdown, energy-storage units are in discharge condition;
As switching tube S2、S3When only one switching tube is connected, energy-storage units are bypassed, the energy conversion being not involved in circuit.
2. a kind of series hybrid multiport DC/DC converter suitable for energy-storage units access according to claim 1, Be characterized in that: in series hybrid MPC, by by the two-way DC/DC unit of multiple tandem types carry out respectively it is in series or in parallel after, Connect again with unidirectional boosting DC/DC converter, N(N >=1 may be implemented) it a energy-storage units while accessing.
3. using the series hybrid multiport DC/DC that any one is accessed suitable for energy-storage units as described in claim 1-2 A kind of street lamp illumination system of converter, it is characterised in that: the unidirectional boosting DC/DC converter of photovoltaic cell connection, it is unidirectional to boost DC/DC converter is connect with the two-way DC/DC unit of tandem type, and the two-way DC/DC unit of tandem type connects DC bus;
DC bus connects two-way DC/AC converter, and two-way DC/AC converter connects AC network;
DC bus connects DC/AC converter, and DC/AC converter connects AC load;
DC bus connects DC/DC converter, and DC/DC converter connects DC load.
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