CN108092288A - Load control unit, AC charging system and control method - Google Patents

Load control unit, AC charging system and control method Download PDF

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Publication number
CN108092288A
CN108092288A CN201810091105.0A CN201810091105A CN108092288A CN 108092288 A CN108092288 A CN 108092288A CN 201810091105 A CN201810091105 A CN 201810091105A CN 108092288 A CN108092288 A CN 108092288A
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CN
China
Prior art keywords
phase
charging pile
power
electric vehicle
load
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201810091105.0A
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Chinese (zh)
Inventor
何照安
董振龙
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Xi'an teride lingchong New Energy Technology Co., Ltd
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Xian Tgood Intelligent Charging Technology Co Ltd
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Publication date
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Priority to CN201810091105.0A priority Critical patent/CN108092288A/en
Publication of CN108092288A publication Critical patent/CN108092288A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/26Arrangements for eliminating or reducing asymmetry in polyphase networks
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/60Monitoring or controlling charging stations
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/50Arrangements for eliminating or reducing asymmetry in polyphase networks
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/70Energy storage systems for electromobility, e.g. batteries
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10Technologies relating to charging of electric vehicles
    • Y02T90/12Electric charging stations
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10Technologies relating to charging of electric vehicles
    • Y02T90/14Plug-in electric vehicles
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10Technologies relating to charging of electric vehicles
    • Y02T90/16Information or communication technologies improving the operation of electric vehicles

Abstract

The present invention relates to a kind of load control unit, AC charging system and control method, which includes:Communication module, for obtaining the three-phase load information of total transformer in real time from backstage distributing monitoring system;Switching switch, moreover, three input terminals of switching switch connect three-phase power line, the power input of the output terminal connection single phase ac charging pile of switching switch respectively;Control module, for determining minimum load phase according to three-phase load information, by controlling switching switch that the power input of single phase ac charging pile is made to access the supply line of minimum load phase, and when single phase ac charging pile and electric vehicle establish CP handshake, charged using the supply line of minimum load phase for electric vehicle.Implement technical scheme, business or residential property is made to realize the three-phase equilibrium of power grid on the premise of additional high-power reactive-load compensation equipment is not increased, improve power grid quality.

Description

Load control unit, AC charging system and control method
Technical field
The present invention relates to a kind of automobile charging field more particularly to load control unit, AC charging system and controlling parties Method.
Background technology
The popularization of electric vehicle has become a kind of trend, and is that the charging station that electric vehicle charges includes independent charging station And it is arranged on the charging station in residential area.For the charging station being arranged in residential area, each alternating-current charging pile generally connects What is entered is single-phase alternating current, since the stochastic behaviour of electric vehicle charging load brings many do not know to distribution network operation Property, for example, the tri-phase unbalance factor of power grid can be increased.Furthermore, it is contemplated that at present since business and residential quarters early stage are not planned Electrically-charging equipment, and for the development for coordinating electric vehicle, the later stage can generally increase the smaller AC charging of power and volume Stake carrys out meet demand, can be further exacerbated by the tri-phase unbalance factor of power grid.
The content of the invention
To solve the problems, such as the tri-phase unbalance factor of the above-mentioned increase power grid in the presence of the prior art, the present invention provides one Kind load control unit, AC charging system and control method, can realize the three-phase equilibrium of power grid, improve power grid quality.
The technical solution adopted by the present invention to solve the technical problems is:A kind of load control unit is constructed, it is built-in or outer Single phase ac charging pile is connected to, including:
Communication module, for obtaining the three-phase load information of total transformer in real time from backstage distributing monitoring system;
Switching switch, moreover, three input terminals of the switching switch connect three-phase power line respectively, the switching is opened The power input of the output terminal connection single phase ac charging pile of pass;
Control module, for determining minimum load phase according to the three-phase load information, by controlling the switching switch The power input of the single phase ac charging pile is made to access the supply line of the minimum load phase, and in the single phase ac When charging pile and electric vehicle establish CP handshake, using the supply line of the minimum load phase for the electric vehicle into Row charges.
Preferably, the control module is additionally operable to obtain the current maximum available power of the single phase ac charging pile, and Judge whether the current maximum available power is more than preset value, more than preset value, and the single phase ac charging pile with When electric vehicle establishes CP handshake, charged using the supply line of the minimum load phase for the electric vehicle.
Preferably, CP generation modules are further included, moreover,
The control module is additionally operable to when the single phase ac charging pile and electric vehicle establish CP handshake, root According to the demand power of the electric vehicle and current maximum available power, the rated power of the single phase ac charging pile, determine The final duty cycle of pwm signal;
The CP generation modules for generating pwm signal according to identified final duty cycle, and pass through CP lines to described Electric vehicle transmits the pwm signal.
Preferably,
When the load control unit is built in the single phase ac charging pile,
The control module, for the current maximum available power of the single phase ac charging pile and rated power to be carried out Compare, and the smaller value in the two determines the first duty cycle of pwm signal;In the single phase ac charging pile and electronic vapour When vehicle establishes CP handshake, obtained according to the demand power of the rated power of the single phase ac charging pile and the electric vehicle The second duty cycle of pwm signal is taken, and when second duty cycle is compared to first duty, and will be in the two Smaller value is determined as the final duty cycle of pwm signal;
When the load control unit is external in the single phase ac charging pile, the load control unit further includes CP Sampling module, moreover,
The CP sampling modules, for when the single phase ac charging pile and electric vehicle establish CP handshake, from The master control borad of the single phase ac charging pile obtains the second duty cycle of pwm signal;
The control module, be additionally operable to by the current maximum available power of the single phase ac charging pile and rated power into Row compares, and the smaller value in the two determines the first duty cycle of pwm signal;And to first duty when described Two duty cycles are compared, and the smaller value in the two is determined as to the final duty cycle of pwm signal.
The present invention also constructs a kind of AC charging system, including total transformer, further includes:
For obtaining the backstage distributing monitoring system of the three-phase load information of total transformer in real time;And
Multiple single phase ac charging piles, and the single phase ac charging pile and the backstage distributing monitoring system communication link It connects;
Above-described load control unit, and the load control unit is built-in or is external in the single phase ac charging Stake.
The present invention also constructs a kind of AC charging control method, comprises the following steps:
Step S10. obtains the three-phase load information of total transformer from backstage distributing monitoring system in real time;
Step S20. determines minimum load phase according to the three-phase load information, and passes through and switching switch is controlled to make blow-up The power input of current charge stake accesses the supply line of the minimum load phase, wherein, three inputs of the switching switch End connects three-phase power line, the power input of the output terminal connection single phase ac charging pile of the switching switch respectively;
Step S30. is when judging that the single phase ac charging pile establishes CP handshake with electric vehicle, using described The supply line of minimum load phase charges for the electric vehicle.
Preferably, it is further comprising the steps of between the step S20 and the step S30:
Step S40. obtains the current maximum available power of the single phase ac charging pile;
Step S50. judges whether the current maximum available power is more than preset value, if it is not, then performing the step S40;If so, perform the step S30.
Preferably, the step S30 comprises the following steps:
Step S31. is when judging that the single phase ac charging pile establishes CP handshake with electric vehicle, according to described Current maximum available power, the rated power of the demand power of electric vehicle and the single phase ac charging pile, determine pwm signal Final duty cycle;
Step S32., should to electric vehicle transmission by CP lines according to the final duty cycle of identified pwm signal Pwm signal.
Preferably, the step S31 comprises the following steps:
The current maximum available power of the single phase ac charging pile and rated power are compared by step S311., and Smaller value in the two determines the first duty cycle of pwm signal;
Step S312. is when the single phase ac charging pile and electric vehicle establish CP handshake, according to described single-phase The demand power of the rated power of alternating-current charging pile and the electric vehicle determines the second duty cycle of pwm signal;
To first duty, when second duty cycle is compared step S313., and by the smaller value in the two It is determined as the final duty cycle of pwm signal.
Implement technical scheme, load control unit of the invention can in real time be obtained according to backstage distributing monitoring system The input of single phase ac charging pile is connected to a phase line of load minimum by the three-phase power load data taken, makes business Or residential property realizes the three-phase equilibrium of power grid on the premise of additional high-power reactive-load compensation equipment is not increased, and improves power grid Quality.
In addition, the load control unit of the present invention also realizes charge power by changing the duty cycle of CP signal PWM waves Adjusting, so as to solve the problems, such as that the limited built cell of power capacity can not carry out electric load scheduling in real time and multi-brand is old Old charging pile can not be unified to carry out the problem of power is adjusted in real time in situation about not powering off.Improve built cell load scheduling Flexibility and the utilization rate of charging pile.
Description of the drawings
It in order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this Some embodiments of invention, for those of ordinary skill in the art, without creative efforts, can be with Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the circuit diagram of business or cell AC charging system of the invention;
Fig. 2 is a kind of structure diagram of the first embodiment of AC charging system provided by the invention;
Fig. 3 is the structure diagram of the first embodiment of load control unit in Fig. 2;
Fig. 4 is a kind of structure diagram of the second embodiment of AC charging system provided by the invention;
Fig. 5 is the structure diagram of the first embodiment of load control unit in Fig. 4;
Fig. 6 is a kind of flow diagram of the first embodiment of AC charging control method provided by the invention.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work Embodiment belongs to the scope of protection of the invention.
Fig. 1 is the circuit diagram of business or cell AC charging system of the invention, in the AC charging system, backstage Distributing monitoring system 20 accesses the supply line of total transformer, and the three-phase load information for obtaining total transformer in real time.It is more A single phase ac charging pile 11,12 ..., 1N the supply line of total transformer is accessed by respective load control unit respectively, Moreover, each single phase ac charging pile 11,12 ..., 1N be attached by order wire and backstage distributing monitoring system 20, when So it can also carry out wireless communication connection.It should be noted that in other embodiments, load control unit can also be built in blow-up In current charge stake.
Fig. 2 is a kind of structure diagram of the first embodiment of AC charging system provided by the invention, the embodiment AC charging system includes single phase ac charging pile and is external in the load control unit 102 of the single phase ac charging pile, and should Single phase ac charging pile includes charging gun (not shown), master control borad 101.In addition, load control unit 102 accesses total transformer A, B, C three-phase power line and zero curve N.After single phase ac charging pile activation (such as user's triggering), load control unit 102 obtain three-phase load information in real time from backstage distributing monitoring system 20, and switch to the phase line of load minimum to power.
Further, in the single phase ac charging pile of the embodiment, CP signals as single phase ac charging pile with it is electronic The charging connection bridge of automobile, to feed back, the connection of charging gun is ready, fills by changing the level magnitude of CP signals for electric vehicle Establish the states such as beginning, charging termination by cable, load control unit 102 adjusts electricity by changing the final duty cycle of CP signal PWM waves The charge power of electrical automobile, so as to realize electric load scheduling in the case where single phase ac charging pile is not stopped.
To sum up, single phase ac charging pile of the invention is to have the function of three-phase power line selection, the charging of power dispatching Stake, in addition, the single phase ac charging pile has further included metering module, display module etc..
Fig. 3 is the structure diagram of the first embodiment of load control unit in Fig. 2, the load control unit of the embodiment Include:Control module 1021, communication module 1022, switching switch 1023.Wherein, communication module 1022 is used for from rear station power distribution Monitoring system obtains the three-phase load information of total transformer in real time, which is, for example, serial communication modular, is led to It crosses serial mode and the real time load data of every phase distribution is sent to control module 1021.There are four inputs for the tool of switching switch 1023 End and two output terminals, moreover, three input terminals of the switching switch 1023 connect three-phase power line respectively, another input Terminal connecting zero line, two output terminals of the switching switch connect two ac input ends of single phase ac charging pile (not shown) respectively, when So in other embodiments, the switching switch of one-out-three also may be selected in switching switch, and three of them input terminal connects three-phase confession respectively Electric line, the power input of an output terminal connection single phase ac charging pile, in addition, another input of single phase ac charging pile End is directly accessed the zero curve of total transformer.Control module 1021 is used to determine minimum load phase according to three-phase load information, passes through Control switching switch 1023 makes the power input of the single phase ac charging pile access the supply line of minimum load phase, and at this When single phase ac charging pile and electric vehicle establish CP handshake, using the supply line of minimum load phase for electric vehicle into Row charges.
Further, control module 1021 be additionally operable to obtain the single phase ac charging pile current maximum available power it is (surplus Remaining power capacity), and judge whether current maximum available power is more than preset value, it is filled more than preset value, and in single phase ac When electric stake establishes CP handshake with electric vehicle, charged using the supply line of minimum load phase for electric vehicle. In one specific example, maximum available power can be obtained in the following manner:Two electric energy meters, one of electric energy meter can be set For gathering the current power general power P1 of community resident electricity consumption in real time, another electric energy meter is used to gather multiple single phase acs in real time The current charging general power P2 of charging pile, if the maximum rated power of cell distribution system is P0, the efficiency of cell transformer because Number is C0, then the current maximum available power of single phase ac charging pile is:P0*C0-P1-P2.In addition, it is only filled in single phase ac When the current maximum available power of electric stake is more than preset value (for example, 1kW), it is electric vehicle just to allow the single phase ac charging pile It charges, so as to avoid less efficiently charging, also reduces charging risk.
Further, with reference to load control unit shown in Fig. 3, which further includes CP generation modules 1024, moreover, control module 1021 is additionally operable to when single phase ac charging pile and electric vehicle establish CP handshake, according to electricity The demand power of electrical automobile and current maximum available power, the rated power of single phase ac charging pile, determine the final of pwm signal Duty cycle;CP generation modules 1024 are used to generate pwm signal according to identified final duty cycle, and pass through CP lines to electronic vapour Vehicle transmits pwm signal.
Further, with reference to load control unit shown in Fig. 3, which further includes CP sampling modules 1025, wherein, control module 1021 is additionally operable to carry out the current maximum available power and rated power of single phase ac charging pile Compare, and the smaller value in the two determines the first duty cycle of pwm signal, it should be noted that, power is accounted for first herein The correspondence of empty ratio is conducted with reference to GBT18487.1-2015 electric vehicles in charging system to be provided in General Requirement in appendix A Charging current and duty cycle mapping relations.CP sampling modules 1025 are used to establish CP in single phase ac charging pile and electric vehicle During handshake, the second duty cycle of pwm signal is obtained from the master control borad of single phase ac charging pile, wherein, the second duty cycle is Master control borad is determined according to the rated power of single phase ac charging pile and the demand power of electric vehicle.Moreover, control module 1021 are additionally operable to that when the second duty cycle is compared to the first duty, and the smaller value in the two is determined as pwm signal Final duty cycle.Finally it should be noted that, CP signals is connect the bridge of single phase ac charging pile and electric vehicle, specifically: After control module 1021 detects plug in rifle signal by CP generation modules 1024, master control is fed back to by CP sampling modules 1025 Plate connects ready message, and then, the CP that control module 1021 starts to sample master control borad output by CP sampling modules 1025 is defeated Enter the second duty cycle of signal.Control module 1021 is by sampled data (the second duty cycle) and real time load data (the first duty Than) comparison after, the PWM wave of final duty cycle is exported to electric vehicle by CP generation modules 1024.
In addition, the load control unit of the embodiment further includes accessory power supply 1026, the accessory power supply 1026 is from total transformation Electricity is taken in a wherein phase supply line (for example, A phases) for device, after converted, module 1021 is powered in order to control.
Fig. 4 is a kind of structure diagram of the second embodiment of AC charging system provided by the invention, the embodiment The load control unit 102 ' that AC charging system includes single phase ac charging pile and is built in the single phase ac charging pile exists This it should be noted that, the load control unit 102 ' of the embodiment is different compared to load control unit 102 shown in Fig. 2 Only it is:The load control unit 102 ' of the embodiment is also integrated with the function of master control borad, i.e. load control unit 102 ' and master control Plate becomes one.
Fig. 5 is the structure diagram of the first embodiment of load control unit in Fig. 4, the load control unit of the embodiment 102 ' include control module 1021 ', communication module 1022 ', switching switch 1023 ', CP generation modules 1024 ' and accessory power supply 1026 ', moreover, the load control unit of the embodiment compares load control unit shown in Fig. 3, different is only the reality Applying the control module 1021 ' of example also has the function of master control borad in charging pile, therefore can save the CP in embodiment shown in Fig. 3 Sampling module.In this embodiment, control module 1021 ', which is used to establishing CP in single phase ac charging pile and electric vehicle, shakes hands letter Number when, according to the demand power of electric vehicle and current maximum available power, the rated power of single phase ac charging pile, determine The final duty cycle of pwm signal.Specifically, control module 1021 ' is used for the current maximum available work of single phase ac charging pile Rate and rated power are compared, and the smaller value in the two determines the first duty cycle of pwm signal;It is additionally operable to single-phase When alternating-current charging pile and electric vehicle establish CP handshake, according to the rated power of single phase ac charging pile and electric vehicle Demand power determines the second duty cycle of pwm signal;It is additionally operable to that when the second duty cycle is compared to the first duty, and by two Smaller value in person is determined as the final duty cycle of pwm signal.
Fig. 6 is a kind of flow diagram of the first embodiment of AC charging control method provided by the invention, the implementation The AC charging control method of example is applied in single phase ac charging pile, and is comprised the following steps:
Step S10. obtains the three-phase load information of total transformer from backstage distributing monitoring system in real time;
Step S20. determines minimum load phase according to three-phase load information, and passes through and switching switch is controlled to fill single phase ac The supply line of the power input access minimum load phase of electric stake, and continue to that this charging terminates, wherein, switching switch Three input terminals connect three-phase power line, the output terminal of the output terminal connection single phase ac charging pile of switching switch respectively;
Step S30. uses minimum load when judging that single phase ac charging pile establishes CP handshake with electric vehicle The supply line of phase charges for electric vehicle.
In addition, at the end of electric vehicle is fully charged or other accidents cause charging, CP signal level amplitudes can be triggered Change, it is synchronous to pass through CP sampling modules after the CP generation modules in load control unit detect that the level of CP signals changes Master control borad is fed back, so as to complete charge.
Further, it is further comprising the steps of between step S20 and step S30:
Step S40. obtains the current maximum available power of single phase ac charging pile;
Step S50. judges whether current maximum available power is more than preset value, if it is not, then performing step S40;If so, Perform step S30.
In a specific embodiment, step S30 comprises the following steps:
Step S31. is when judging that single phase ac charging pile establishes CP handshake with electric vehicle, according to electric vehicle Demand power and single phase ac charging pile current maximum available power, rated power, determine the final duty of pwm signal Than;
Step S32. transmits PWM letters by CP lines according to the final duty cycle of identified pwm signal to electric vehicle Number.
Further, step S31 comprises the following steps:
The current maximum available power and rated power of single phase ac charging pile are compared by step S311., and according to Smaller value in the two determines the first duty cycle of pwm signal;
Step S312. charges when single phase ac charging pile and electric vehicle establish CP handshake according to single phase ac The rated power of stake and the demand power of electric vehicle determine the second duty cycle of pwm signal;
To the first duty, when the second duty cycle is compared step S313., and the smaller value in the two is determined as PWM The final duty cycle of signal.
Step in the method for the embodiment of the present invention can be sequentially adjusted, merged and deleted according to actual needs.This Module or unit or subelement in the device of inventive embodiments can be combined, divided and deleted according to actual needs.This The all or part of step that field those of ordinary skill is appreciated that in the various methods of above-described embodiment is can to pass through program Carry out the device-dependent hardware of command terminal to complete, which can be stored in a computer readable storage medium, and storage is situated between Matter can include:Flash disk, read only memory ROM, random access device RAM, disk or CD etc..
The above disclosed right for being only presently preferred embodiments of the present invention, the present invention cannot being limited with this certainly Scope, one of ordinary skill in the art will appreciate that realize all or part of flow of above-described embodiment, and according to right of the present invention It is required that the equivalent variations made, still fall within and invent covered scope.

Claims (9)

  1. It is built-in or be external in single phase ac charging pile 1. a kind of load control unit, which is characterized in that including:
    Communication module, for obtaining the three-phase load information of total transformer in real time from backstage distributing monitoring system;
    Switching switch, moreover, three input terminals of the switching switch connect three-phase power line respectively, the switching switch Output terminal connects the power input of single phase ac charging pile;
    Control module, for determining minimum load phase according to the three-phase load information, by the way that the switching switch is controlled to make institute The power input for stating single phase ac charging pile accesses the supply line of the minimum load phase, and charges in the single phase ac When stake establishes CP handshake with electric vehicle, filled using the supply line of the minimum load phase for the electric vehicle Electricity.
  2. 2. load control unit according to claim 1, which is characterized in that
    The control module is additionally operable to obtain the current maximum available power of the single phase ac charging pile, and judges described work as Whether preceding maximum available power is more than preset value, is built more than preset value, and in the single phase ac charging pile with electric vehicle During vertical CP handshake, charged using the supply line of the minimum load phase for the electric vehicle.
  3. 3. load control unit according to claim 1 or 2, which is characterized in that CP generation modules are further included, moreover,
    The control module is additionally operable to when the single phase ac charging pile and electric vehicle establish CP handshake, according to institute The demand power of electric vehicle and current maximum available power, the rated power of the single phase ac charging pile are stated, determines that PWM believes Number final duty cycle;
    The CP generation modules for generating pwm signal according to identified final duty cycle, and pass through CP lines to described electronic Automobile transmits the pwm signal.
  4. 4. load control unit according to claim 3, which is characterized in that
    When the load control unit is built in the single phase ac charging pile,
    The control module, for the current maximum available power of the single phase ac charging pile and rated power to be compared Compared with, and the smaller value in the two determines the first duty cycle of pwm signal;In the single phase ac charging pile and electric vehicle When establishing CP handshake, obtained according to the demand power of the rated power of the single phase ac charging pile and the electric vehicle Second duty cycle of pwm signal, and when second duty cycle is compared to first duty, and by the two compared with Small value is determined as the final duty cycle of pwm signal;
    When the load control unit is external in the single phase ac charging pile, the load control unit further includes CP samplings Module, moreover,
    The CP sampling modules, for when the single phase ac charging pile and electric vehicle establish CP handshake, from described The master control borad of single phase ac charging pile obtains the second duty cycle of pwm signal;
    The control module is additionally operable to compare the current maximum available power of the single phase ac charging pile and rated power Compared with, and the smaller value in the two determines the first duty cycle of pwm signal;And first duty when described second is accounted for Empty ratio is compared, and the smaller value in the two is determined as to the final duty cycle of pwm signal.
  5. 5. a kind of AC charging system, including total transformer, which is characterized in that further include:
    For obtaining the backstage distributing monitoring system of the three-phase load information of total transformer in real time;And
    Multiple single phase ac charging piles, and the single phase ac charging pile is communicated to connect with the backstage distributing monitoring system;
    Claim 1-4 any one of them load control units, and the load control unit is built-in or is external in the list Cross streams charging pile.
  6. 6. a kind of AC charging control method, which is characterized in that comprise the following steps:
    Step S10. obtains the three-phase load information of total transformer from backstage distributing monitoring system in real time;
    Step S20. determines minimum load phase according to the three-phase load information, and passes through and switching switch is controlled to fill single phase ac The power input of electric stake accesses the supply line of the minimum load phase, wherein, three input terminals point of the switching switch Three-phase power line, the power input of the output terminal connection single phase ac charging pile of the switching switch are not connected;
    Step S30. uses the minimum when judging that the single phase ac charging pile establishes CP handshake with electric vehicle The supply line of load phase charges for the electric vehicle.
  7. 7. AC charging control method according to claim 6, which is characterized in that in the step S20 and the step It is further comprising the steps of between S30:
    Step S40. obtains the current maximum available power of the single phase ac charging pile;
    Step S50. judges whether the current maximum available power is more than preset value, if it is not, then performing the step S40;If It is then to perform the step S30.
  8. 8. AC charging control method according to claim 7, which is characterized in that the step S30 comprises the following steps:
    Step S31. is when judging that the single phase ac charging pile establishes CP handshake with electric vehicle, according to described electronic Current maximum available power, the rated power of the demand power of automobile and the single phase ac charging pile, determine pwm signal most Whole duty cycle;
    Step S32. transmits PWM letters by CP lines according to the final duty cycle of identified pwm signal to the electric vehicle Number.
  9. 9. AC charging control method according to claim 8, which is characterized in that the step S31 comprises the following steps:
    The current maximum available power of the single phase ac charging pile and rated power are compared by step S311., and according to Smaller value in the two determines the first duty cycle of pwm signal;
    Step S312. is when the single phase ac charging pile and electric vehicle establish CP handshake, according to the single phase ac The demand power of the rated power of charging pile and the electric vehicle determines the second duty cycle of pwm signal;
    To first duty, when second duty cycle is compared step S313., and the smaller value in the two is determined For the final duty cycle of pwm signal.
CN201810091105.0A 2018-01-30 2018-01-30 Load control unit, AC charging system and control method Pending CN108092288A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109696592A (en) * 2018-12-18 2019-04-30 广东电网有限责任公司 A kind of charger test load control method, device and storage medium
CN110525241A (en) * 2019-08-12 2019-12-03 国家电网有限公司 The device and method that the power of a kind of pair of wireless charging system receiving end is adjusted
CN112193100A (en) * 2020-10-14 2021-01-08 厦门银河龙芯科技有限公司 Phase rotation supported electric automobile intelligent charging method and equipment
CN112248841A (en) * 2020-12-22 2021-01-22 菲尼克斯(南京)新能源汽车技术有限公司 Electric automobile charging plug supporting ordered charging and method for realizing ordered charging
CN112290566A (en) * 2020-11-05 2021-01-29 张岳 Three-phase balancing method and system for alternating-current charging pile

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109696592A (en) * 2018-12-18 2019-04-30 广东电网有限责任公司 A kind of charger test load control method, device and storage medium
CN109696592B (en) * 2018-12-18 2021-06-08 广东电网有限责任公司 Charger test load control method and device and storage medium
CN110525241A (en) * 2019-08-12 2019-12-03 国家电网有限公司 The device and method that the power of a kind of pair of wireless charging system receiving end is adjusted
CN112193100A (en) * 2020-10-14 2021-01-08 厦门银河龙芯科技有限公司 Phase rotation supported electric automobile intelligent charging method and equipment
CN112290566A (en) * 2020-11-05 2021-01-29 张岳 Three-phase balancing method and system for alternating-current charging pile
CN112248841A (en) * 2020-12-22 2021-01-22 菲尼克斯(南京)新能源汽车技术有限公司 Electric automobile charging plug supporting ordered charging and method for realizing ordered charging

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