CN208646623U - A kind of efficient electric car direct current charge system - Google Patents
A kind of efficient electric car direct current charge system Download PDFInfo
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- CN208646623U CN208646623U CN201820888976.0U CN201820888976U CN208646623U CN 208646623 U CN208646623 U CN 208646623U CN 201820888976 U CN201820888976 U CN 201820888976U CN 208646623 U CN208646623 U CN 208646623U
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- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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Abstract
The utility model relates to a kind of efficient electric car direct current charge systems, belong to new-energy automobile field.The system includes the pile body and output DC bus, AC/DC converter, DC/DC converter, capacitor, distribution transformer and power grid of direct current charge stake；One end of distribution transformer is connected to power grid, and the other end is connected to the end AC of AC/DC converter, and the end DC of AC/DC converter is connected with the output DC bus of electric vehicle DC fast charge stake；One end of DC/DC converter is connected with capacitor, and the other end is connected with direct current charge stake output DC bus and absorbs the low-order harmonic in AC/DC average anode current by controlling.The utility model only needs single-stage AC/DC power conversion, and small-power DC/DC only absorbs harmonic current, avoids whole charge powers and flows through additional DC/DC converter, to save cost and improve the efficiency of direct current charge system.
Description
Technical field
The utility model belongs to new-energy automobile field, is related to a kind of efficient electric car direct current charge system.
Background technique
In recent years, electric automobile market tremendous expansion, every country is also in the development for actively promoting electric car.Current Europe
The multiple countries in continent have been started up and formulate fuel vehicle and prohibit selling timetable, and China is putting into effect relevant policies.However electric car
The construction of charging infrastructure relatively lags behind, and the electric car charging time is considerably longer than the refueling time of conventional fuel oil car, makes
It is poor at automobile user experience, fuel vehicle can not be replaced in a short time.In the main charging modes of two classes, alternating-current charging pile
Commonly known as trickle charge stake is mainly to provide patching and measuring for single-phase alternating current, and the transformation of alternating current-direct current is then by vehicle-mounted
Several kilowatts of charger charges to battery pack；Direct-current charging post is commonly known as fast charge stake, and high-power (dozens to hundreds of thousand
Watt) the transformation of three-phase alternating current to DC charging power completed in direct current stake system, the output DC bus connection of direct current stake
Batteries of electric automobile group realizes high-power charging, and charging is completed usually in one hour.Therefore, automobile user experience is close
The key of fuel vehicle is to develop direct current rapid nitriding, the construction of promotion direct current charge facility.
Current direct current charge stake implementation is all the power supply implementation (such as Fig. 1) converted using two stage power, and
Most of is unidirectional power stream, AC/DC therein generallys use three-phase Vienna rectifier, and DC/DC using LLC resonance every
Release structure (such as Fig. 2).The needs of interacting (V2G) to meet electric car with power grid, the power supply topologies of bidirectional power flow
Also there is application (such as Fig. 3) in some demonstrative projects or engineering.In general, the three-phase voltage of 380V passes through AC/DC collector ring
After section, output DC voltage (common DC bus voltage) will be greater than 537V, and the DC/DC converter of rear class is female by public direct-current
Line voltage is depressured to batteries of electric automobile group (battery voltage range of mainstream car design is 250V-400V) side.Direct current charge by
Higher in its power grade, up to dozens or even hundreds of kilowatt, therefore its efficiency is most important.Current charging pile is from three
Mutually the nominal operation point efficiency of power conversion of exchange side to direct current output is commonly 94-95%.Under this system structure, into
The efficiency that one step improves power conversion needs to increase considerably the cost of system.
Still remove the DC/DC power conversion of rear class without the power conversion system of direct current charge stake at present and uses single-stage
AC/DC to carry out fast charge to batteries of electric automobile group.Level-one power conversion link can actually be reduced by doing so, and be improved efficiency
And cost is saved, but following three problems will be encountered:
First, be the low-order harmonic problem of charging current: it is inferior main that the voltage of one side grid side contains 5,7,11,13
Harmonic wave causes the deviation of the sine degree of voltage；The stake of another aspect fast charge and the exchange of all electrical equipments (load or grid-connected)
Load (or grid-connected) electric current of net side must satisfy the requirement of rechargeable standard, that is, keep the good sine of equipment current on line side
Degree；Then low-order harmonic is just contained in the resulting power of the product of voltage and current；This low-order harmonic power is in single-stage ACDC
In transformation, the side DC can only be arrived, and the voltage of the side DC under the premise of metastable (if the busbar voltage of direct-current charging post is by institute
The batteries of electric automobile group voltage of connection is determined), the charging current of the side DC just has low-order harmonic, to violate charging mark
It is quasi-.Under the topological structure that the two stage power of traditional charging pile converts, whole power must can all be led in this way by DCDC
The stability that DCDC carrys out the output electric current of constant charge stake side is crossed, physical substance is by public straight between ACDC and DCDC
The capacitor on bus is flowed to absorb low-order harmonic power.
Second, it is the variation for needing to solve the problems, such as large range of output DC voltage.The direct current output of single-stage AC/DC
Voltage is a boost type, and when three-phase alternating voltage is 380V, DC side output voltage will be greater than 537V.Therefore, original
Two stage power transformation in rear class DC/DC carry out decompression transformation may be implemented output DC voltage range by a relatively large margin change
Change to be adapted to the end voltage change range of (250V-400V) of batteries of electric automobile group.Therefore, input voltage is three-phase 380V's
Single-stage AC/DC is then unable to satisfy the exemplary voltages range of electric car charging.
Third, the problem of being galvanically isolated.In the structure of original two stage power transformation, electrical isolation is by DC/DC ring
Section is realized, i.e., inverse by carrying out AC/DC output DC voltage (common DC bus voltage) in DC/DC power inverter
Become, by being rectified again after high frequency transformer, to realize the adjusting of electrical isolation and DC output voltage.Obviously, this every
From the bigger loss that link will cause efficiency.But if then needing to solve the need of electrical isolation using single-stage AC/DC power conversion
It asks.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of efficient electric car direct current charge system, at
Function solves the problems, such as above-described three, so as to carry out direct current to batteries of electric automobile group using AC/DC single stage shift
Fast charge greatly improves the efficiency of power conversion, is increased to 97% or more from original 94-95%, while also reducing direct current
The cost of fast charge stake power conversion system.
In order to achieve the above objectives, the utility model provides the following technical solutions:
A kind of efficient electric car direct current charge system, the system include the pile body and output direct current of direct current charge stake
Bus, AC/DC converter, capacitor, distribution transformer and power grid；One end of the distribution transformer is connected to the power grid, separately
One end is connected to the end AC of AC/DC converter, and the end DC of the AC/DC converter and the output of electric car direct current charge stake are straight
Bus is flowed to be connected.
Further, which further includes DC/DC converter, and one end of the DC/DC converter is connected with capacitor, the other end
It is connected with direct current charge stake output DC bus and absorbs the low order in AC/DC converter DC side output electric current by controlling
Harmonic wave, thus the charging current of stable power-driven automobile batteries.
Further, the non-isolated two-way DC/DC that the DC/DC converter is made of a half-bridge.
Further, the DC/DC converter is defeated by the current-order of capacitance voltage stability contorting outer ring first by control
The output for extracting link with harmonic current out is added, and harmonic current compensation is then realized by a current inner loop and maintains electricity
AC/DC converter DC side is exported the low-order harmonic in electric current and is absorbed into DC/DC by the electric current output order for holding voltage stabilization
In the capacitor of the other side, so that charging current is stablized.
Further, the bidirectional power flow that the AC/DC converter is made of three phase full bridge current transformer and Three-phase electric-wave filter
AC/DC converter.
Further, the AC/DC for the unidirectional power stream that the AC/DC converter is made of three-phase Vienna rectifier is converted
Device.
Further, between the end DC of the AC/DC converter and the output DC bus of electric car direct current charge stake also
Equipped with contactor.
Further, the voltage class of the distribution transformer high-pressure side is 35kV or 10kV；Simultaneously by its secondary side around
The reasonable selection of the no-load voltage ratio of group, low-pressure side three-phase alternating voltage is reduced, and is met so that the DC side of AC/DC converter exports
The minimum voltage of mainstream batteries of electric automobile group voltage change range, to realize that DC output voltage from low to high is adjusted.
Further, the distribution transformer is Three-Phase Distribution Transformers, the low-pressure secondary side three with multiple groups independent winding
It mutually exports, and mutually isolated between each group three-phase low-voltage secondary side winding.
Further, the AC/DC converter carries out multiple parallel connections to realize larger fast charge power；Each AC/DC independently connects
Connect the three-phase alternating current low-pressure side of a stand-alone power distribution transformer, or multiple independent low-pressure secondary side three-phases by distribution transformer
It exports and powers to each AC/DC；DC/DC can be parallel-connected to the DC side output of each AC/DC with one-to-one mode,
It can also be parallel-connected to single DC/DC on the direct current output bus of multiple AC/DC parallel connections.
Compared with prior art, the utility model has the prominent advantages that:
The traditional scheme of the power conversion of two-stage series (is isolated or non-isolated) with DC/DC compared with AC/DC, this is practical new
Power conversion system is become single-stage AC/DC by type, and is successfully solved single-stage AC/DC transformation and directly filled to batteries of electric automobile group
The three major issues that output DC voltage range, charging current low-order harmonic and the direct current output that electricity will encounter are isolated with power grid.
Therefore, the utility model only needs the power conversion of single-stage AC/DC, and low power DC/DC is only used to absorb harmonic current, avoid
Whole chargings are high-power to flow through DC/DC converter, to save equipment cost and improve the power of direct current charge system
Conversion efficiency.
Detailed description of the invention
In order to keep the purpose of this utility model, technical scheme and beneficial effects clearer, the utility model provides as follows
Attached drawing is illustrated:
Fig. 1 is the knot of AC/DC and the electric car fast charge power supply implementation of DC/DC two stage power transformation in the prior art
Structure schematic diagram；
Fig. 2 is that first order AC/DC uses three-phase Vienna rectifier in the prior art, and second level DC/DC is humorous using LLC
The structural schematic diagram of the electric car fast charge power supply implementation of the isolated form unidirectional power stream of vibration；
Fig. 3 is the electric car charging quickly of the two stage power transformation of bidirectional power flow (having the function of V2G) in the prior art
Source structure schematic diagram；
Fig. 4 is the system structure diagram of the utility model embodiment one；
Fig. 5 is the topology diagram of AC/DC converter in the utility model embodiment one；
Fig. 6 is the control block diagram of AC/DC converter in the utility model embodiment one；
Fig. 7 is the topology diagram of DC/DC converter in the utility model embodiment one；
Fig. 8 is the control block diagram of DC/DC converter in the utility model embodiment one；
Fig. 9 is the prototype experiment test waveform in the utility model embodiment one；
Figure 10 is the structure for realizing high-power fast charge in the utility model embodiment two by multiple AC/DC converter parallel connections
Figure.
Figure 11 is that every AC/DC parallel connection DC/DC converter carries out overall parallel connection in fact again in the utility model embodiment two
The system architecture diagram of existing high-power fast charge.
Specific embodiment
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below in conjunction with specific
The utility model is described in detail in embodiment.It should be evident that following embodiment will be helpful to those skilled in the art
The utility model is further understood, but it does not constitute limitations of the present invention, it will be apparent to those skilled in the art that can
To create similar attached drawing under the general plotting of the utility model.These are all within the protection scope of the present invention.
Embodiment one: Fig. 4 is that the direct current charge system based on single-stage AC/DC power conversion in the utility model is tied substantially
Composition.The structure includes the distribution transformer connecting with medium voltage distribution network, an AC/DC converter, a DC/DC transformation
Device, capacitor and charging pile body.Wherein distribution transformer primary side is connect with the medium voltage distribution network of 10kV or 35kV, secondary side
(the nonstandard voltage rating of 176V) is connect with the side AC of AC/DC converter.The side DC of AC/DC converter and the direct current of charging pile are female
Line connection.The side of DC/DC is connected on charging pile DC bus, and the other side is capacitor.The pile body of charging pile is charging system
With the interface of electric automobile power battery group, it is internally integrated a controller, the control system and power electric with electric car
The communication of pond management system；It can also be the DC bus of charging pile equipped with main relay, one side under normal conditions, the other side is
The charging gun of pile body is connect for the charging interface with electric car.Controller is communicated with the BMS of electric car in pile body, control
Main relay processed is cut-off, and dispatches the watt level of the power conversion system in fast charging system, realizes the fast charge of electric car.
In system AC/DC converter realize power by power distribution network to the transmission of electric automobile power battery group, it is any can be real
The topological structure of existing AC-to DC power conversion is used equally for AC/DC converter, such as three phase full bridge, Vienna rectifier,
To simplify the explanation, three phase full bridge the opening up as AC/DC converter with bi-directional power conversion ability is chosen in the present embodiment
It flutters, as shown in Figure 5.It charges initial stage in electric car, AC/DC realizes the constant-current charge to electric automobile power battery group；In electricity
Electrical automobile charges the later period, and AC/DC realizes the constant-voltage charge to electric automobile power battery group；It charges the complete period in electric car
In, most times are constant-current charges.Illustrate that the single-stage AC/DC in this embodiment realizes that charging current and voltage control below
Method.
AC/DC DC side control block diagram is as shown in fig. 6, it is made of three control rings, respectively direct current pressure ring, direct current
Electric current loop and interior electric current loop.Interior electric current loop is realized under dq coordinate system, and the three-phase voltage and three of acquisition exchange side is passed through
Wherein three-phase voltage can be sent into phaselocked loop to obtain the frequency and phase of exchange side voltage, three-phase voltage and three-phase by phase current
Electric current carries out dq transformation according to the phase information of phaselocked loop output simultaneously, by the feedback of the electric current under dq coordinate system and reference value
Difference by PI controller generate dq coordinate system under voltage reference value, the three-phase voltage reference signal of reconvert to abc, thus
Three-phase voltage is exported by AC/DC and generates required three-phase current in filter inductance with net side three-phase voltage.Since dq is sat
There are the couplings of d axis and q axis for controller under mark system, therefore interior electric current loop also needs that Feedforward Decoupling link is added.DC voltage
Ring is used for the voltage in constant voltage charging phase control DC side, and output quantity is the reference quantity of DC side electric current, and the reference quantity is logical
It crosses an amplitude limit link and obtains the reference quantity for being ultimately delivered to DC current ring, it is maximum fair to guarantee that DC side charging current does not exceed
Perhaps electric current.DC current ring output valve is the reference component of interior electric current loop d axis, for controlling the watt current of Inductor,
And interior electric current loop q axis component control be then Inductor reactive current, for fast fill device, which is typically set to
0, if carrying out reactive compensation if necessary to the points of common connection (PCC) to fast charge station, then a reactive power can additionally be added
Ring makes it export corresponding Q shaft current reference component.When AC/DC converter works, the controller of charging pile, which would generally issue, to be filled
Piezoelectric voltage is instructed to the controller of AC/DC converter.Wherein charging voltage instruction is usually the final voltage value (electricity of constant-voltage charge
Voltage, such as 400V in the full electricity of pond group highest), the value is by the reference quantity as direct current pressure ring.AC/DC converter, which receives, to be issued
Voltage instruction after, direct current pressure ring can attempt first by DC side output voltage stabilization constant-voltage charge voltage value.But work as
Power battery electricity is less when keeping its interior voltage lower (such as 250V), and charging current may only be more than maximum allowable charging electricity
Stream could generate enough pressure drops on the internal resistance of cell to balance the output of the constant-voltage of AC/DC converter.At this point, direct current pressure ring
The amplitude limit link of outlet side will limit the current reference of DC current ring, it is made to be no more than constant-current charge electric current.In such case
Under, AC/DC would operate in constant current charging mode, and its actual output voltage is equal to the sum of voltage and charging current pressure drop in battery
And it is instructed lower than charging voltage.When power battery electricity increases, interior voltage also increased, when interior voltage is close to constant-voltage charge
When voltage instruction (such as 400V), the output current reference amount of direct current pressure ring can be then gradually reduced, and be lower than the perseverance of amplitude limit link
Galvanic electricity flow valuve, AC/DC would operate in constant-voltage charge mode at this time, and charger output voltage is instructed equal to constant pressure, and charging current is not
It is disconnected to reduce until power battery electricity is completely filled with.
The secondary side voltage of distribution transformer is specified using nonstandard 176V, is the DC voltage change range according to AC/DC
Rational choice is carried out, to meet the minimum voltage requirement of its active rectification.May be since AC/DC DC voltage is minimum
250V, it is therefore desirable to which the AC side line voltage peak of AC/DC is lower than 250V, then the voltage of Circuit Fault on Secondary Transformer should be set as 176V or summary
It is low.
The harmonic pollution of power grid in order to prevent, national standard are to have strict demand to the percent harmonic distortion of electrically-charging equipment grid-connected current
, it is generally the case that AC/DC converter can keep the current sinusoidal of its side AC.Since there are harmonic distortions for network voltage, at this time
The side AC of AC/DC will generate harmonic current with the presence of harmonic power, and in the charging current of the side DC.Harmonic wave electricity in order to prevent
It flows into electric automobile power battery, the DC/DC in the present embodiment will absorb the harmonic current.
There are many option, the topological structures of any achievable bidirectional power flow to be applicable in for the topological structure of DC/DC converter
In this situation.To simplify the explanation, the present embodiment chooses topology of the half-bridge of bidirectional power as DC/DC converter, such as Fig. 7 institute
Show.The low-pressure side of DC/DC converter is connected with the DC bus of charging pile, and high-pressure side only has a capacitor and exists.Pass through control
Harmonic current on DC bus is absorbed into capacitor by DC/DC converter, and control block diagram is as shown in Figure 8.The controller is first
The current-order output of capacitance voltage stability contorting outer ring is added with the output that harmonic current extracts link first, then passes through one
A current inner loop realizes harmonic current compensation and maintains the stable electric current output order of capacitance voltage.In harmonic current link,
Controller can acquire the whole electric currents exported on charging pile common DC bus by AC/DC, which passes through a low-pass filtering
Device extracts DC component, then instantaneous value and DC component are subtracted each other, and finally obtains the harmonic component of charging current, as interior electricity
Flow a part of ring given value.And another part given value is generated by capacitance voltage ring, with the electricity of stable regulation downstream lateral capacitance
Pressure value (higher than the voltage value of charging pile common DC bus).In the present embodiment, the given value and instantaneous value of capacitance voltage ring
After making difference, error amount is sent into the PI controller of Voltage loop, and another of the interior electric current loop of generation is given.Two electric currents export given value
The given value of current inner loop will be obtained after addition, which is sent into inner ring PI controller compared with instantaneous value, final real
Now to the control of DC/DC converter inductive current.In this control mode, DC/DC will absorb the harmonic wave electricity exported by AC/DC
Stream, so that the stability into the charging current of electric automobile power battery group meets standard " Q/GDW 1233-2014
Electric car non-on-board charger General Requirement " in 6.12 regulation.
The experimental prototype test waveform of fast charging system described in the present embodiment is as shown in Figure 9.Four waveforms divide from top to bottom
Not Wei in DC/DC harmonic wave downstream side capacitance voltage, the whole electric currents exported by AC/DC on charging pile DC bus, electronic vapour
The inductive current of the final charging current of vehicle power battery pack and DC/DC.As can be seen that the case where network voltage distorts
Under, there are a large amount of harmonic waves for the side the DC electric current of AC/DC output, and DC/DC can effectively absorb harmonic current, and battery is kept to fill
Electric current it is steady.
Two: one electric car direct current charge stakes of embodiment have dozens to hundreds of kilowatt of power, different automobile types
Maximum charge power is not quite similar, and in order to realize the flexible configuration of power, the present embodiment is in parallel with multiple single-stage AC/DC converters
As shown in Figure 10, it is only connected in parallel on the common DC bus of charging pile with a low power DC/DC herein, it is all for absorbing
The harmonic current of AC/DC converter output in parallel.When multiple single-stage AC/DC parallel connections, need respectively to exchange it side isolation.This
When direct current charge station in 10kV distribution transformer use with multiple low-pressure secondary sides winding transformer, secondary side winding
Voltage is that 176V is specified or slightly lower.The primary side of transformer is still connect with middle pressure 10kV power distribution network, each independent secondary side
Winding is connected with the side that exchanges of an AC/DC module, and the DC side parallel of multiple AC/DC mould groups is linked into charging pile DC bus
On, the common fast charge for realizing electric car.This embodiment can also use one lesser DC/ of each single-stage AC/DC parallel connection
DC converter establishes one's own system, and the mode for then carrying out overall parallel connection again is as shown in figure 11.
Compared with prior art, the utility model having the prominent advantages that in the application of this specific embodiment:
Existing AC/DC and the concatenated stage type charging system of DC/DC are reduced to single stage type AC/DC transformation, greatly simplified
The structure of system, has saved the construction cost of system while promoting fast charge efficiency.In the fast charging system of traditional stage type,
DC/DC needs to use identical power grade with AC/DC, not only increases the additional power conversion of level-one, also increases one
The cost of power inverter.Fast charging system described in the present embodiment, it is only necessary to which AC/DC carries out level-one power conversion, effectively mentions
Rise the efficiency of fast charge；And DC/DC is only used for absorbing the harmonic current of fraction, therefore the power grade of DC/DC is far smaller than more
The overall power grade of platform parallel connection AC/DC does not influence the overall cost of system substantially.
On the other hand, the form that the utility model uses more AC/DC converter parallel connections realizes fast charge.Due to different vehicles
The battery size of type is different from capacity, and also different from, unified building are powerful fast for the maximum fast charge power that can bear
Fill the waste that stake will cause resource.And the system structure of small module A C/DC parallel connection can be according to demand used by the utility model
Flexible combination AC/DC converter, and assign it on the DC bus of each charging pile body, realize flexibly matching for output power
The phenomenon that setting, reducing the waste of resource, and reduce the idleness of equipment.
Finally, it is stated that preferred embodiment above is only to illustrate the technical solution of utility model rather than limits, although
The utility model has been described in detail by above preferred embodiment, however, those skilled in the art should understand that,
Various changes can be made to it in the form and details, are limited without departing from the utility model claims book
Range.
Claims (10)
1. a kind of efficient electric car direct current charge system, it is characterised in that: the system includes the pile body of direct current charge stake
With output DC bus, AC/DC converter, capacitor, distribution transformer and power grid；One end of the distribution transformer is connected to institute
Power grid is stated, the other end is connected to the end AC of AC/DC converter, the end DC of the AC/DC converter and electric car direct current charge
The output DC bus of stake is connected.
2. a kind of efficient electric car direct current charge system according to claim 1, it is characterised in that: the system is also
Including DC/DC converter, one end of the DC/DC converter is connected with capacitor, and the other end and direct current charge stake output direct current are female
Line is connected and absorbs the low-order harmonic in AC/DC converter DC side output electric current by controlling, thus stable power-driven automobile
The charging current of battery.
3. a kind of efficient electric car direct current charge system according to claim 2, it is characterised in that: the DC/
The non-isolated two-way DC/DC that DC converter is made of a half-bridge.
4. a kind of efficient electric car direct current charge system according to claim 2, it is characterised in that: the DC/
The current-order output of capacitance voltage stability contorting outer ring is extracted link with harmonic current first by control by DC converter
Output is added, and the electric current output that harmonic current compensation is then realized by a current inner loop and maintains capacitance voltage stable refers to
It enables, AC/DC converter DC side is exported into the low-order harmonic in electric current and is absorbed into the capacitor of the other side DC/DC, so that
Charging current is stablized.
5. a kind of efficient electric car direct current charge system according to claim 1, it is characterised in that: the AC/
The AC/DC converter for the bidirectional power flow that DC converter is made of three phase full bridge current transformer and Three-phase electric-wave filter.
6. a kind of efficient electric car direct current charge system according to claim 1, it is characterised in that: the AC/
The AC/DC converter for the unidirectional power stream that DC converter is made of three-phase Vienna rectifier.
7. a kind of efficient electric car direct current charge system according to claim 1, it is characterised in that: the AC/
Contactor is additionally provided between the end DC of DC converter and the output DC bus of electric car direct current charge stake.
8. a kind of efficient electric car direct current charge system according to claim 1, it is characterised in that: the distribution
The voltage class of high voltage side of transformer is 35kV or 10kV；It, will be low simultaneously by the reasonable selection of the no-load voltage ratio of its secondary side winding
Side three-phase alternating voltage is pressed to reduce, so that the DC side output of AC/DC converter meets mainstream batteries of electric automobile group voltage
The minimum voltage of variation range, to realize that DC output voltage from low to high is adjusted.
9. a kind of efficient electric car direct current charge system according to claim 1, it is characterised in that: the distribution
Transformer is Three-Phase Distribution Transformers, and the low-pressure secondary side three-phase with multiple groups independent winding exports, and each group three-phase low-voltage
It is mutually isolated between secondary side winding.
10. a kind of efficient electric car direct current charge system according to claim 1, it is characterised in that: the AC/
DC converter carries out multiple parallel connections to realize larger fast charge power；One stand-alone power distribution transformer of each AC/DC independent connection
Three-phase alternating current low-pressure side, or exported by multiple independent low-pressure secondary side three-phases of distribution transformer and powered to each AC/DC；
DC/DC is exported with the DC side that one-to-one mode is parallel-connected to each AC/DC, or is parallel-connected to single DC/DC
On the direct current output bus of multiple AC/DC parallel connections.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820888976.0U CN208646623U (en) | 2018-06-08 | 2018-06-08 | A kind of efficient electric car direct current charge system |
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| CN201820888976.0U CN208646623U (en) | 2018-06-08 | 2018-06-08 | A kind of efficient electric car direct current charge system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108528263A (en) * | 2018-06-08 | 2018-09-14 | 重庆聚陆新能源有限公司 | A kind of efficient electric vehicle direct current charge system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108528263A (en) * | 2018-06-08 | 2018-09-14 | 重庆聚陆新能源有限公司 | A kind of efficient electric vehicle direct current charge system |
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Granted publication date: 20190326 Termination date: 20210608 |