阅读说明：本技术 适用于电动汽车混合储能系统的多源变换器及变换方法 (Multi-source converter and transform method suitable for hybrid energy storage system of electric automobile ) 是由 郭希铮 王剑 王琛琛 周明磊 游小杰 郝瑞祥 罗章 邹方朔 于 2019-08-27 设计创作，主要内容包括：本发明提供了一种适用于电动汽车混合储能系统的多源变换器及变换方法,属于变换器技术领域。包括第一直流能量源和第二直流能量源均与变换器的直流侧连接,变换器的交流侧连接三相交流电机；变换器包括上桥臂开关、中间桥臂开关和下桥臂开关；上桥臂开关的一端连接于第一直流能量源的正极端,下桥臂开关的一端连接第一直流能量源的负极端和第二直流能量源的负极端,中间桥臂开关的一端连接第二直流能量源的正极端；上桥臂开关的另一端、所述下桥臂开关的另一端和所述中间桥臂开关的另一端均连接所述三相交流电机。本发明优化了系统结构,减小了变换器体积和重量,降低了成本,控制简单,消除了双向DC-DC变换器自身工作时的损耗问题,提升了系统效率。(The present invention provides a kind of multi-source converters and transform method suitable for hybrid energy storage system of electric automobile, belong to converter technical field.It is connect with the DC side of converter including the first DC energy source and the second DC energy source, the exchange side of converter connects three phase alternating current motor；Converter includes upper bridge arm switch, intermediate axle arm switch and lower bridge arm switch；One end of upper bridge arm switch is connected to the positive terminal in the first DC energy source, and one end of lower bridge arm switch connects the negative pole end in the first DC energy source and the negative pole end in the second DC energy source, and one end of intermediate axle arm switch connects the positive terminal in the second DC energy source；The other end, the other end of lower bridge arm switch and the other end of the intermediate axle arm switch of upper bridge arm switch are all connected with the three phase alternating current motor.Present invention optimizes system structures, reduce converter volume and weight, reduce costs, and control is simple, eliminate loss problem when bidirectional DC-DC converter itself work, improve system effectiveness.)

1. a kind of multi-source converter suitable for hybrid energy storage system of electric automobile, it is characterised in that: including the first DC energy Source, the second DC energy source and converter, first DC energy source and second DC energy source with the change The DC side of parallel operation connects, and the exchange side of the converter connects three phase alternating current motor；

The converter, for first DC energy source and second DC energy source to be transformed to AC energy；

The converter includes upper bridge arm switch, intermediate axle arm switch and lower bridge arm switch；

One end of the upper bridge arm switch is connected to the positive terminal in first DC energy source, one end of the lower bridge arm switch The negative pole end in first DC energy source and the negative pole end in second DC energy source are connected, the intermediate axle arm switch One end connects the positive terminal in second DC energy source；

The other end of the other end of the upper bridge arm switch, the other end of lower bridge arm switch and the intermediate axle arm switch is equal Connect the three phase alternating current motor.

2. the multi-source converter according to claim 1 suitable for hybrid energy storage system of electric automobile, it is characterised in that: institute Stating bridge arm switch includes the first control piece, the second control piece and third control piece；The lower bridge arm switch includes the 4th control Part, the 5th control piece and the 6th control piece；The intermediate axle arm switch includes the 7th control piece, the 8th control piece and the 9th control Part；

One end of first control piece, second control piece and the third control piece is commonly connected to first direct current The positive terminal of energy source；

One end of 4th control piece, the 5th control piece and the 6th control piece is all connected with first DC energy source The negative pole end of negative pole end and second DC energy source；

One end of 7th control piece, the 8th control piece and the 9th control piece connects the second direct current energy jointly The positive terminal in amount source；

The other end of first control piece, the 7th control piece and the 4th control piece connects the three-phase alternating current jointly The first end of motor；

The other end of second control piece, the 8th control piece and the 5th control piece connects the three-phase alternating current jointly The second end of motor；

The other end of the third control piece, the 9th control piece and the 6th control piece connects the three-phase alternating current jointly The third end of motor.

3. the multi-source converter according to claim 2 suitable for hybrid energy storage system of electric automobile, it is characterised in that: institute State the first control piece, second control piece, the third control piece, the 4th control piece, the 5th control piece, described 6th control piece, the 7th control piece, the 8th control piece and the 9th control piece include at least one by controlling entirely The power control part of one diode of type power device inverse parallel composition.

4. the multi-source converter according to claim 3 suitable for hybrid energy storage system of electric automobile, it is characterised in that:

First control piece, second control piece and the third control piece respectively include the equal power control of quantity Product forms in parallel or series；

4th control piece, the 5th control piece and the 6th control piece respectively include the equal power control of quantity Product forms in parallel or series；

7th control piece, the 8th control piece and the 9th control piece respectively include the equal power control of quantity Product forms in parallel or series.

5. the multi-source converter according to any one of claims 1 to 4 suitable for hybrid energy storage system of electric automobile, special Sign is: first DC energy source is the vehicle-mounted power supply of electric car；Second DC energy source is super capacitor.

6. the multi-source converter according to claim 5 suitable for hybrid energy storage system of electric automobile, it is characterised in that: institute State the vehicle-mounted power supply of electric car be fuel cell, lithium ion battery, lithium-air battery, zinc-air battery, sodium chlorination nickel-based battery or One of flying wheel battery.

7. a kind of method for carrying out energy conversion using multi-source converter as claimed in any one of claims 1 to 6, feature exist In: by using space vector modulation to the multi-source converter, obtains two groups of switch states differences but direction vector is identical Set of vectors, respectively set of vectors one and set of vectors two；By adjusting the work of set of vectors one and set of vectors two in space vector modulation It is distributed with the time, controls the electric current in DC side the first DC energy source and the second DC energy source, obtain a variety of current flowing moulds Formula.

8. the method according to the description of claim 7 is characterized in that a variety of current flowing modes include:

One: the second DC energy source of mode assists the first DC energy source to export energy to three phase alternating current motor simultaneously；

Two: the first DC energy source of mode individually exports energy to three phase alternating current motor；

Three: the second DC energy source of mode individually exports energy to three phase alternating current motor；

Four: the first DC energy source of mode exports energy to the second DC energy source simultaneously to three phase alternating current motor output energy；

Five: the second DC energy source of mode assists the first DC energy source to absorb energy from three phase alternating current motor simultaneously；

Six: the first DC energy source of mode individually absorbs energy from three phase alternating current motor；

Seven: the second DC energy source of mode individually absorbs energy from three phase alternating current motor；

Eight: the first DC energy source of mode absorbs energy from three phase alternating current motor and absorbs energy from the second DC energy source simultaneously.

Technical field

The present invention relates to converter technical fields, and in particular to a kind of multi-source suitable for hybrid energy storage system of electric automobile Converter and transform method.

Background technique

Currently, battery is big as energy-storage travelling wave tube its memory capacity, energy density is big, but power density is relatively low, in big electricity Huge damage can be caused to battery body under electrician's condition by banishing, and be deteriorated so as to cause the storage performance of battery, battery life is reduced； Super capacitor (Ultra Capacitor, UC) is a kind of New Charge energy-storage travelling wave tube, biggest advantage be specific power it is very high, Specific energy is big, and charge and discharge are fast, is adapted as the power output source of short time, but its an important disadvantage is that energy is close Spend it is low, cannot keep well constantly energy output.Battery and UC are bonded mixed energy storage system (Hybrid Energy Storage System, HESS), both battery and UC have complementary advantages, and the existing specific energy of the HESS being composed is high Advantage also has the advantages that specific power is high, and greatly reduces the internal loss of battery itself, extends device lifetime.

Traditional electric car HESS is made of battery pack, super capacitor, DC-DC converter and its energy management system, Current HESS generally couples motor for multiple energy units such as battery, super capacitor using independent bidirectional DC-DC converter Inverter direct-flow side, DC side is using DC-AC converter by DC inversion at exchange output driving motor.In general, double Electric current when being used to control the output voltage and regenerative braking energy feedback of from DC bus to DC-DC converter makes battery and surpasses Grade capacitor work is in optimum state.

And the addition of bidirectional DC-DC converter, increase the complexity of system control；And bidirectional DC-DC converter increases Big system weight and volume, so that system cost increases；In addition the loss of bidirectional DC-DC converter itself at work, drop The low whole efficiency of system.

Summary of the invention

The purpose of the present invention is to provide a kind of suitable for the multi-source converter of hybrid energy storage system of electric automobile and transformation Method, to solve technical problem present in above-mentioned background technique.

To achieve the goals above, this invention takes following technical solutions:

On the one hand, a kind of multi-source converter suitable for hybrid energy storage system of electric automobile provided by the invention, including the One DC energy source, the second DC energy source and converter, first DC energy source and second DC energy source It is connect with the DC side of the converter, the exchange side of the converter connects three phase alternating current motor；

The converter, for first DC energy source and second DC energy source to be transformed to alternating current energy Amount；

The converter includes upper bridge arm switch, intermediate axle arm switch and lower bridge arm switch；

One end of the upper bridge arm switch is connected to the positive terminal in first DC energy source, the lower bridge arm switch One end is separately connected the negative pole end in first DC energy source and the negative pole end in second DC energy source, the intermediate axle One end of arm switch connects the positive terminal in second DC energy source；

The other end of the upper bridge arm switch, the other end of lower bridge arm switch and the intermediate axle arm switch it is another End is all connected with the three phase alternating current motor.

Preferably, the upper bridge arm switch includes the first control piece, the second control piece and third control piece；The lower bridge arm Switch includes the 4th control piece, the 5th control piece and the 6th control piece；The intermediate axle arm switch includes the 7th control piece, the 8th Control piece and the 9th control piece；

One end of first control piece, second control piece and the third control piece is commonly connected to described first The positive terminal in DC energy source；

One end of 4th control piece, the 5th control piece and the 6th control piece is all connected with first DC energy The negative pole end of the negative pole end in source and second DC energy source；

It is straight that one end of 7th control piece, the 8th control piece and the 9th control piece connects described second jointly The positive terminal in stream energy source；

The other end of first control piece, the 7th control piece and the 4th control piece connects the three-phase jointly The first end of alternating current generator；

The other end of second control piece, the 8th control piece and the 5th control piece connects the three-phase jointly The second end of alternating current generator；

The other end of the third control piece, the 9th control piece and the 6th control piece connects the three-phase jointly The third end of alternating current generator.

Preferably, first control piece, second control piece, the third control piece, the 4th control piece, institute The 5th control piece, the 6th control piece, the 7th control piece, the 8th control piece and the 9th control piece is stated to wrap Include at least one power control part being made of one diode of full-control type power device inverse parallel.

Preferably, it is equal to respectively include quantity for first control piece, second control piece and the third control piece The power control part form in parallel or series；

4th control piece, the 5th control piece and the 6th control piece respectively include the equal function of quantity Rate control piece forms in parallel or series；

7th control piece, the 8th control piece and the 9th control piece respectively include the equal function of quantity Rate control piece forms in parallel or series.

Preferably, first DC energy source is the vehicle-mounted power supply of electric car；Second DC energy source is super Capacitor.

Preferably, the vehicle-mounted power supply of the electric car is fuel cell, lithium ion battery, lithium-air battery, zinc air electricity One of pond, sodium chlorination nickel-based battery or flying wheel battery.

On the other hand, the present invention also provides it is a kind of using multi-source converter as described above carry out energy conversion method, By using space vector modulation to the multi-source converter, two groups of switch states differences but the identical vector of direction vector are obtained Group, respectively set of vectors one and set of vectors two；By adjusting in space vector modulation when the effect of set of vectors one and set of vectors two Between distribute, control DC side the first DC energy source and the second DC energy source electric current, obtain a variety of current flowing modes.

Preferably, a variety of current flowing modes include:

One: the second DC energy source of mode assists the first DC energy source to export energy to three phase alternating current motor simultaneously；

Two: the first DC energy source of mode individually exports energy to three phase alternating current motor；

Three: the second DC energy source of mode individually exports energy to three phase alternating current motor；

Four: the first DC energy source of mode exports energy to the second DC energy source simultaneously to three phase alternating current motor output energy Amount；

Five: the second DC energy source of mode assists the first DC energy source to absorb energy from three phase alternating current motor simultaneously；

Six: the first DC energy source of mode individually absorbs energy from three phase alternating current motor；

Seven: the second DC energy source of mode individually absorbs energy from three phase alternating current motor；

Eight: the first DC energy source of mode absorbs energy from three phase alternating current motor and absorbs energy from the second DC energy source simultaneously Amount.

The invention has the advantages that: the bidirectional DC-DC converter for eliminating traditional electric car HESS each energy-storage travelling wave tube application, To eliminate the problem of bidirectional DC-DC converter bring system controlling extent complexity, bidirectional DC-DC converter volume and again is eliminated The cost problem increased is measured to optimization system structure, eliminate loss problem when bidirectional DC-DC converter itself work to Lifting system whole efficiency.

The additional aspect of the present invention and advantage will be set forth in part in the description, these will become from the following description Obviously, or practice through the invention is recognized.

Detailed description of the invention

In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment Attached drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this For the those of ordinary skill of field, without creative efforts, it can also be obtained according to these attached drawings others Attached drawing.

Fig. 1 is the topology for being suitable for the multi-source converter of hybrid energy storage system of electric automobile described in the embodiment of the present invention 1 Schematic diagram.

Fig. 2 is the energy-storage system structure chart being made of described in the embodiment of the present invention 1 multi-source converter.

Fig. 3 is on-vehicle battery in the mixed energy storage system that is made of multi-source converter described in the embodiment of the present invention 1, super The energy flux pattern diagram that capacitor, three phase alternating current motor are realized.

Fig. 4 is the HESS structural schematic diagram being made of described in the embodiment of the present invention 2 multi-source converter.

Fig. 5 is the multi-source transformer configuration schematic diagram of single-phase bridge arm described in the embodiment of the present invention 2.

Fig. 6 is the HESS structural schematic diagram being made of described in the embodiment of the present invention 3 multi-source converter.

Fig. 7 is the multi-source transformer configuration schematic diagram of single-phase bridge arm described in the embodiment of the present invention 3.

Specific embodiment

Embodiments of the present invention are described in detail below, and the example of the embodiment is shown in the accompanying drawings, wherein from beginning Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by attached The embodiment of figure description is exemplary, and for explaining only the invention, and is not construed as limiting the claims.

Those skilled in the art of the present technique are appreciated that unless otherwise defined, all terms used herein (including technology art Language and scientific term) there is meaning identical with the general understanding of those of ordinary skill in fields of the present invention.Should also Understand, those terms such as defined in the general dictionary, which should be understood that, to be had and the meaning in the context of the prior art The consistent meaning of justice, and unless defined as here, it will not be explained in an idealized or overly formal meaning.

Those skilled in the art of the present technique are appreciated that unless expressly stated, singular " one " used herein, " one It is a ", " described " and "the" may also comprise plural form.It is to be further understood that being arranged used in specification of the invention Diction " comprising " refer to that there are the feature, integer, step, operation, element and/or component, but it is not excluded that in the presence of or addition Other one or more features, integer, step, operation, element and/or their group.

In the description of this patent, it is to be understood that term " center ", "upper", "lower", "front", "rear", " left side ", The orientation or positional relationship of the instructions such as " right side ", "vertical", "horizontal", "top", "bottom", "inner", "outside" is based on the figure Orientation or positional relationship, be merely for convenience of description this patent and simplify description, rather than the device of indication or suggestion meaning or Element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as the limitation to this patent.

In the description of this patent, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase Even ", " connection ", " setting " shall be understood in a broad sense, for example, it may be being fixedly linked, being arranged, may be a detachable connection, set It sets, or is integrally connected, is arranged.For the ordinary skill in the art, above-mentioned art can be understood as the case may be The concrete meaning of language in this patent.

It is of the invention for ease of understanding, explanation is further explained to the present invention with specific embodiment with reference to the accompanying drawing, and Specific embodiment does not constitute the restriction to the embodiment of the present invention.

It should be appreciated by those skilled in the art that attached drawing is the schematic diagram of embodiment, the component in attached drawing is not necessarily Implement necessary to the present invention.