CN107394857B - Alternating-current charging pile based on transformer area load information and control circuit thereof - Google Patents

Alternating-current charging pile based on transformer area load information and control circuit thereof Download PDF

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Publication number
CN107394857B
CN107394857B CN201710772180.9A CN201710772180A CN107394857B CN 107394857 B CN107394857 B CN 107394857B CN 201710772180 A CN201710772180 A CN 201710772180A CN 107394857 B CN107394857 B CN 107394857B
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China
Prior art keywords
charging
resistor
circuit
capacitor
power
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Application number
CN201710772180.9A
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Chinese (zh)
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CN107394857A (en
Inventor
青志明
宗伟
敬勇
秦燕
罗泽岷
张宏艳
胡军毅
王�义
谢焰
张发标
周飞
彭思维
刘克恒
章陈勇
罗雨顺
邹燕
傅相忠
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Chongqing Shuangdian Technology Co ltd
State Grid Chongqing Electric Power Co Skill Training Center
State Grid Corp of China SGCC
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Chongqing Shuangdian Technology Co ltd
State Grid Chongqing Electric Power Co Skill Training Center
State Grid Corp of China SGCC
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Priority to CN201710772180.9A priority Critical patent/CN107394857B/en
Publication of CN107394857A publication Critical patent/CN107394857A/en
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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION 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
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/30—Constructional details of charging stations
    • B60L53/31—Charging columns specially adapted for electric vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION 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
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/60—Monitoring or controlling charging stations
    • B60L53/63—Monitoring or controlling charging stations in response to network capacity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION 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
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/60—Monitoring or controlling charging stations
    • B60L53/64—Optimising energy costs, e.g. responding to electricity rates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION 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
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/60—Monitoring or controlling charging stations
    • B60L53/66—Data transfer between charging stations and vehicles
    • B60L53/665—Methods related to measuring, billing or payment
    • H02J7/0021—
    • H02J7/0027—
    • H02J7/027—
    • 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
    • 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
    • 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
    • Y02T90/12—Electric charging stations
    • 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
    • Y02T90/16—Information or communication technologies improving the operation of electric vehicles

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses an alternating-current charging pile based on transformer area load information and a control circuit thereof, wherein the control circuit comprises a control unit, a carrier communication module, a power supply unit, an electric vehicle charging control circuit and an electric vehicle battery electric quantity acquisition circuit, and the control unit is connected with a power line through the carrier communication module and is used for uploading various information to an area central controller and receiving instruction signals and display commands issued by the area central controller; the electric automobile battery electric quantity acquisition circuit is used for acquiring the electric automobile battery electric quantity and transmitting the electric automobile battery electric quantity to the control unit; the instruction input unit and the display unit are connected with the control unit; the control unit is used for receiving the instruction signal issued by the central controller of the platform area, outputting the control signal to the electric vehicle charging control circuit and controlling the charging state of the electric vehicle. The balance of the transformer capacity of each district is utilized to charge the electric automobile.

Description

Alternating-current charging pile based on transformer area load information and control circuit thereof
Technical Field
The invention relates to the field of electric automobile charging, in particular to an alternating-current charging pile and a control circuit thereof.
Background
With the rapid development of the automobile industry, the external dependence of the petroleum consumption in China is continuously increased, the petroleum shortage situation is increasingly aggravated in 2013 with 58.1 percent. The development of the electric automobile has great significance to China, on one hand, the electric energy substitution can be improved, the energy consumption of the unit GDP can be effectively reduced, on the other hand, the environmental constraint can be effectively broken, and the problems of air pollution such as haze and the like can be solved.
However, the popularization of electric vehicles requires a corresponding infrastructure, in particular charging stations, and the powerful construction of the charging piles is only possible.
The charging pile is divided into a direct current charging pile and an alternating current charging pile. The function of the electric automobile charging station is similar to that of an oiling machine in a gas station, the electric automobile charging station can be fixed on the ground or a wall, is installed in public buildings (public buildings, malls, public parking lots and the like) and residential area parking lots or charging stations, and can charge various types of electric automobiles according to different voltage levels. The input end of the charging pile is directly connected with an alternating current power grid, and the output end of the charging pile is provided with a charging plug for charging the electric automobile. The charging pile generally provides two charging modes of conventional charging and quick charging, people can use a specific charging card to swipe the card on a man-machine interaction operation interface provided by the charging pile for corresponding charging mode, charging time, charge data printing and other operations, and a charging pile display screen can display data of charging quantity, charge, charging time and the like.
The advantage of using the direct current to charge the pile is: the charging is fast; the defects are that: impact on a power system is large, construction cost is high, and a battery is damaged due to high-current quick charging. According to the construction planning of the country to the electric automobile charging pile: in 2017, 90 ten thousand charging piles are built nationally, wherein 80 ten thousand personal piles are alternating current piles, and the number of the charging piles reaches 480 ten thousand by 2020, wherein about 90% of the charging piles are alternating current charging piles.
The current constructed alternating current charging station mainly adopts a centralized charging service providing mode, and a special matched transformer is used for providing electric energy for a charging pile in the alternating current charging station. The electric vehicles are increasingly popular, the holding capacity of the electric vehicles is continuously increased, and the charging requirements of the electric vehicles are also gradually huge. Then it is sufficient to build a few or a dozen charging piles in no more than one ac charging station when this type of ac charging station is set up. An alternating current charging station with tens of charging piles is more suitable for scientific construction planning, and is also a development trend of the construction scale of the alternating current charging station of the type in the future. The number of the charging piles is too large, so that the capacity design of the transformer matched with the alternating-current charging station is larger and larger, the volume of the transformer is increased continuously, and the occupied land area of one alternating-current charging station is larger. As the amount of electric vehicles kept is continuously increased, the number of ac charging stations must be continuously increased, more and larger transformers will be installed, and more land resources will be occupied, which is a huge cost. It is not acceptable to design and manufacture transformers with larger capacity and huge volume continuously, and occupy more land resources.
Disclosure of Invention
The invention aims to provide an alternating-current charging pile based on transformer area load information and a control circuit thereof, which utilize the allowance of transformer capacity of each district area to charge electric vehicles, so that the invention can provide charging service for the electric vehicles without increasing the capacity of the original transformer, without purchasing a large-capacity transformer, thereby reducing land resource occupation, greatly saving the cost of purchasing the transformer and land resource and reducing the construction cost of an alternating-current charging station.
In general, residential electricity consumption does not generate a situation that all families are fully loaded and electricity is simultaneously consumed, and the capacity design of the transformer in the transformer area is designed according to the maximum total amount of residential electricity in the area after the demand coefficient and the simultaneous coefficient are considered, so that a certain margin exists in the capacity of the transformer in the transformer area generally. The charging pile can utilize the allowance of the transformer capacity of each district transformer to charge the service for the electric automobile.
The invention is realized by adopting the following scheme: the control circuit of the alternating-current charging pile based on the transformer area load information comprises a control unit, a first communication module, a power supply unit, an electric vehicle charging control circuit and an electric vehicle battery electric quantity acquisition circuit, wherein the power supply unit is used for supplying power to the control unit, the communication module, the electric vehicle charging control circuit, the electric vehicle battery electric quantity acquisition circuit, an instruction input unit and a display unit; the control unit is respectively and electrically connected with the communication module, the electric automobile battery electric quantity acquisition circuit, the electric automobile charging control circuit, the instruction input unit and the display unit; the electric automobile battery electric quantity acquisition circuit is used for acquiring electric automobile battery electric quantity and transmitting the electric automobile battery electric quantity to the control unit; the instruction input unit is used for collecting client demand information and transmitting the client demand information to the control unit. The client operation information includes charging mode information selected by the client and active stop charging instruction information. The control unit uploads electric quantity information of the battery of the electric automobile and customer demand information to the central controller of the platform area through the communication module, and receives instruction signals and display commands issued by the central controller of the platform area; the control unit is used for receiving command signals issued by the central controller of the platform area after comprehensively analyzing the capacity allowance of the transformer of the current platform area and the battery capacity information and the client demand information of the electric automobile uploaded by each charging pile, outputting control signals to the charging control circuit of the electric automobile and controlling the charging state of the electric automobile, and the control unit is used for receiving display commands issued by the central controller of the platform area and controlling the display unit to display corresponding information, such as the total number and the residual quantity of the charging piles, the charging price and the like of the charging work currently available. Whether the charging pile charges or not is determined by a control command issued by the central controller of the platform area received by the charging pile.
When the battery of the electric automobile is full or the customer selects to actively stop charging, the charging pile controls the charging connector to be powered off, and the active stop charging instruction information operated by the customer is uploaded to the central controller of the platform area.
The communication module may be a wired communication module or a wireless communication module, and preferably, the communication module adopts a power line carrier communication chip.
The communication module comprises a power line carrier communication chip U1 with a model LM1893 and a transformer T1, wherein a primary coil of the transformer T1 is connected with a power line through a first capacitor C1, one end of a secondary coil of the transformer T1 is respectively connected with one end of a second capacitor C2, one end of a third capacitor C3 and a voltage VCC, the other end of the third capacitor C3 is grounded, the other end of the second capacitor C2 is respectively connected with the other end of the secondary coil of the transformer T1 and a first resistor R1, the other end of the first resistor R1 is respectively connected with a negative electrode of a voltage stabilizing tube VD, a collector electrode of a first triode Q1 and a 10 th pin of the power line carrier communication chip U1, an emitter electrode of the first triode Q1 is respectively connected with one end of the second resistor R2, one end of the third resistor R3 and an 8 th pin of the power line carrier communication chip U1, the other end of the third resistor R3 is grounded, the other end of the second resistor R2 is connected with the base electrode of the first triode Q1 and the 9 th pin of the power line carrier communication chip U1, the 1 st pin of the power line carrier communication chip U1 is connected with the 2 nd pin of the power line carrier communication chip U1 through a fourth capacitor C4, the 3 rd pin of the power line carrier communication chip U1 is connected with the 4 th pin of the power line carrier communication chip U1 through a sixth capacitor C6 and an eighth resistor R8 which are connected in series, the 5 th pin of the power line carrier communication chip U1 is grounded, the 6 th pin of the power line carrier communication chip U1 is grounded through a seventh capacitor C7, the 7 th pin of the power line carrier communication chip U1 is grounded through a fourth resistor R4, the 11 th pin of the power line carrier communication chip U1 is respectively connected with one end of the sixth resistor R6 and the base electrode of the second triode Q2, the other end of the sixth resistor R6 is connected with voltage VCC, the collector electrode of the second triode Q2 is connected with voltage VCC, the emitter of the second triode Q2 is connected with the 12 th pin of the power line carrier communication chip U1 through a seventh resistor R7, the 12 th pin and the 17 th pin of the power line carrier communication chip U1 are respectively connected with the control unit, the 13 th pin of the power line carrier communication chip U1 is grounded through an eighth resistor R8, the 14 th pin of the power line carrier communication chip U1 is grounded, the 15 th pin of the power line carrier communication chip U1 is connected with the voltage VCC, the 16 th pin of the power line carrier communication chip U1 is grounded through a fifth capacitor C5, and the 18 th pin of the power line carrier communication chip U1 is grounded through a 5 th resistor R5 and a potentiometer RP which are connected in series.
The communication module comprises a carrier chip and a carrier coupling circuit, wherein the carrier chip is electrically connected with the control unit, the carrier coupling circuit is electrically connected with the power line, a signal transmitting circuit and a signal receiving circuit are arranged between the carrier coupling circuit and the carrier chip, the input end of the signal transmitting circuit is connected with the carrier chip, the output end of the signal transmitting circuit is connected with the carrier coupling circuit, the input end of the signal receiving circuit is connected with the carrier coupling circuit, and the output end of the signal receiving circuit is connected with the carrier chip.
The signal transmitting circuit comprises a signal power amplifying circuit and an output power control circuit, the signal power amplifying circuit comprises a frequency selecting circuit composed of a fourth capacitor C4 and a first inductor L1, a first field effect tube Q1 and a second field effect tube Q2, the input end of the frequency selecting circuit is connected with a carrier coupling circuit, the output end of the frequency selecting circuit is connected with the drain electrode of the first field effect tube Q1 through a third resistor R3, the source electrode of the first field effect tube Q1 is connected with a reference ground VSS, the output end of the frequency selecting circuit is connected with the drain electrode of the second field effect tube Q2 through a second resistor R2, the source electrode of the second field effect tube Q2 is connected with one end of the fourth resistor R4, the cathode of the first diode D1 and one end of the output power control circuit, the other end of the fourth resistor R4, the anode of the first diode D1 and the grid electrode of the second field effect tube Q2 and one end of a fifth capacitor C5, the other end of the fifth capacitor C5 is respectively connected with the grid electrode of the first field effect tube Q1 and one end of a fifth resistor R5, the other end of the fifth resistor R5 is connected with a carrier chip, the output power control circuit comprises a triode Q3, an emitter of the triode Q3 is connected with power supply voltage, a collector of the triode Q3 is respectively connected with the positive electrode of a seventh capacitor C7, one end of a sixth capacitor C6, one end of a sixth resistor R6 and a signal power amplifying circuit, a negative electrode of the seventh capacitor C7, the other end of the sixth capacitor C6 and the other end of the sixth resistor R6 are connected with a reference ground VSS, a base of the triode Q3 is respectively connected with one end of the seventh resistor R7 and one end of an eighth resistor R8, the other end of the eighth resistor R8 is connected with the power supply voltage, and the other end of the seventh resistor R7 is connected with the reference ground VSS.
The signal receiving circuit comprises a signal filtering circuit and a demodulation circuit, the signal filtering circuit comprises a band-pass passive filter formed by a second inductor L2, an eighth capacitor C8, a third inductor L3 and a ninth capacitor C9, a ninth resistor R9, a second diode D2 and a third diode D3, one end of the ninth resistor R9 is connected with a carrier coupling circuit, the other end of the ninth resistor R9 is connected with one end of the second inductor L2, the other end of the second inductor L2 is connected with one end of the eighth capacitor C8, the other end of the eighth capacitor C8 is respectively connected with one end of the third inductor L3, one end of the ninth capacitor C9, the positive electrode of the second diode D2, the negative electrode of the third diode D3 and the demodulation circuit, the other end of the third inductor L3, the other end of the ninth capacitor C9, the negative electrode of the second diode D2 and the positive electrode of the third diode D3 are grounded, the demodulation circuit comprises a low-power-consumption narrow-band analog front end with the model number of AFE3361, a 16 th pin of the low-power-consumption narrow-band analog front end with the model number of AFE3361 is connected with the signal filtering circuit through a sixteenth capacitor C16, a 1 st pin of the low-power-consumption narrow-band analog front end with the model number of AFE3361 is connected with one end of a seventeenth capacitor C17, the other end of the seventeenth capacitor C17 is connected with one end of a fourth inductor L4, one end of an eighteenth capacitor and one end of a fifteenth resistor respectively, the other end of the fourth inductor L4 and the other end of the eighteenth capacitor are grounded, and the other end of the fifteenth resistor is connected with a carrier chip.
The instruction input unit and the display unit adopt touch screens.
The power supply unit comprises a first power supply conversion circuit, a second power supply conversion circuit and a third power supply conversion circuit, wherein the first power supply conversion circuit is used for converting 220V alternating current power supply into 24V direct current power supply, the second power supply conversion circuit is used for converting 24V direct current power supply into 5V direct current power supply, and the third power supply conversion circuit is used for converting 5V direct current power supply into 3.3V direct current power supply.
The electric automobile charging control circuit comprises a contactor and a relay, wherein the charging connector is connected with alternating current through the contactor, one end of a contact of the contactor is connected with the charging connector, the other end of the contact of the contactor is connected with a power line, the power on or power off of a coil of the contactor is controlled by the relay, and the relay is controlled by the control unit. The control unit is a singlechip. The singlechip drives the relay through ULN2803 LW.
The electric automobile battery electric quantity acquisition circuit can adopt the electric quantity acquisition device with the existing charging pile. The input of electric quantity collection device is connected with the joint electricity that charges for gather electric automobile battery electric quantity information, and electric quantity collection device's output is connected with R485 communication circuit, communicates with the control unit through R485 communication circuit, gives the control unit with the collection electric automobile battery electric quantity information transfer who gathers.
The utility model provides an alternating current charging stake based on transformer platform district load information, includes fills electric pile body, it is equipped with the charging connector that is used for being connected with electric automobile electricity to fill electric pile body, it is equipped with above-mentioned control circuit to fill electric pile body, charging connector is connected with alternating current through electric automobile charging control circuit.
The central controller of the platform area comprises a control unit and a power supply unit, wherein the power supply unit is used for supplying power to the whole controller, the control unit transmits instruction signals and display commands to the charging piles through a second communication module and receives battery information and customer operation information of the electric automobile, which are uploaded by the charging piles, the control unit is connected with a power utilization information acquisition system or 485 ports of a platform area electric energy meter through a third communication module and used for acquiring real-time power utilization information of the platform area, the control unit is used for analyzing the acquired real-time power utilization information of the platform area to obtain the capacity allowance of a transformer of the current area, the control unit is used for calculating the quantity of the charging piles which are allowed to perform charging work at the same time at present according to the capacity allowance of the transformer of the current area, the control unit is used for receiving the battery information of the electric automobile which is to be charged and the customer operation information uploaded by each charging pile, comprehensively analyzing the quantity of the charging piles which are allowed to perform charging work at the same time at present according to the set charging rules, controlling the charging piles to be supplied with the charging piles according to the set charging rules on the premise of not exceeding the capacity allowance of the platform area transformer, and controlling the electric automobile to be connected with the charging piles, and displaying the current charge piles and the current charge quantity and the current charge pile. The premise of not exceeding the capacity allowance of the transformer in the area is that the central controller in the area can only send N charging instructions at most, N is the number of charging piles which allow charging work to be carried out simultaneously at present, namely the central controller in the area can only control N electric vehicles to be charged simultaneously at most, and in particular, the method for selecting the electric vehicles to charge is determined according to the charging mode selected by a customer and the charging rule set by the active stopping charging instructions in a matching mode. Preferably, the control unit of the central controller of the platform area is a singlechip. The second communication module may be a wired communication module or a wireless communication module, and preferably, the second communication module is a carrier communication module, and the carrier communication module is connected with a power line. The third communication module may be a 485 communication module, or may be a carrier communication module. The information collected by the electricity consumption information collection system can be uploaded to the central controller of the platform area through 485 communication or carrier communication.
The central controller of the platform area is also provided with an instruction input unit and a display unit, and can be used for setting various modes of charging cost price and the like. The instruction input unit and the display unit are electrically connected with the control unit of the central controller of the platform area. Preferably, the instruction input unit and the display unit adopt touch screens.
The charging rules set in the central controller of the platform area are as follows: allowing a customer to select a sudden charging mode and an intelligent charging mode, setting the charging electricity price of the sudden charging mode to be higher than that of the intelligent charging mode, and distributing the residual power resources to the electric vehicle requesting the intelligent charging mode after distributing the power resources to the electric vehicle requesting the sudden charging mode by the central controller of the platform area; if the customer selects the quick charging mode, on the premise of not exceeding the capacity allowance of the transformer in the transformer area, allowing a sufficient number of charging piles to continuously charge the electric automobile requesting the quick charging mode until the battery of the electric automobile requesting the quick charging mode is full or the customer actively stops charging; if the customer selects the intelligent charging mode, on the premise of not exceeding the capacity allowance of the transformer in the transformer area, allowing a sufficient number of charging piles to intermittently charge the electric automobile requesting the intelligent charging mode according to the sequence from low to high of the electric quantity of the electric automobile to be charged until the electric quantity of the electric automobile is full or the customer actively stops charging.
The central controller of the platform area collects battery electric quantity information of all electric vehicles to be charged through the charging piles, the central controller of the platform area selects the electric vehicles with the quantity which is allowed to be slowly charged currently from the obtained battery electric quantity information of the electric vehicles requesting the intelligent charging mode according to the sequence from low battery electric quantity to high, when a certain battery electric quantity position corresponds to a plurality of electric vehicles, if the quantity of the electric vehicles which are allowed to be charged currently is greater than or equal to the quantity of the electric vehicles corresponding to the battery electric quantity position, all the electric vehicles corresponding to the battery electric quantity position are selected to be charged, and if the quantity of the electric vehicles which are allowed to be charged currently is less than the quantity of the electric vehicles corresponding to the battery electric quantity position, the electric vehicles with the required quantity are randomly selected from the electric vehicles corresponding to the battery electric quantity position to be charged.
When the charging pile receives a charging instruction issued by the central controller of the platform area, the charging connector is electrified and begins to charge, and when the charging pile receives a charging stopping instruction issued by the central controller of the platform area, the charging connector is powered off and stops charging, the charging pile is used for uploading a charge settlement signal to the central controller of the platform area, and the central controller of the platform area receives the charge settlement signal and then performs charge settlement processing.
The charging pile charging price adopts a floating price, and two charging prices are designed on the basis, namely a sudden charging mode charging price and an intelligent charging mode charging price, wherein the sudden charging mode charging price is higher than the intelligent charging mode charging price.
The power supply network corresponds to peak valley period, and the electricity prices of different periods are high or low. Therefore, when the charging price of the charging pile is designed, the charging price of the charging pile in the emergency charging mode and the charging price of the intelligent charging mode are also continuously changed by referring to the electricity price of the power supply network in the peak-to-valley period as a basis. The method aims at shifting peaks and filling valleys by using price factors, reducing the load of a power grid and keeping power supply stable. The charging price of the sudden charging mode is increased on the basis of the floating price, and the charging price of the corresponding intelligent charging mode is higher. This is to meet the customer's demand for charging electric vehicles in particular, but at the same time, the price is raised because the charging power resources are preferentially occupied. Besides meeting the urgent needs of customers, people are encouraged to use the intelligent charging mode to evenly distribute charging power resources as much as possible.
The intelligent charging mode charging price is increased on the basis of the floating price, and the intelligent charging mode charging price is lower. The intelligent charging mode can distribute charging power resources relatively evenly, and because the charging power resources do not have priority, the charging time of the electric automobile is longer than that of the emergency charging mode, and therefore the charging price is lower than that of the emergency charging mode. Meanwhile, customers without urgent charging demands are encouraged to use the intelligent charging mode to charge as much as possible by price factors.
The invention has the advantages that: the control circuit of the alternating-current charging pile comprises a control unit, a communication module, a power supply unit, an electric vehicle charging control circuit and an electric vehicle battery electric quantity acquisition circuit, wherein the electric vehicle battery electric quantity acquisition circuit is used for acquiring electric vehicle battery electric quantity and transmitting the electric vehicle battery electric quantity to the control unit; the instruction input unit is used for collecting client demand information and transmitting the client demand information to the control unit. The client operation information includes charging mode information selected by the client and active stop charging instruction information. The control unit uploads electric quantity information of the battery of the electric automobile and customer demand information to the central controller of the platform area through the communication module, and receives instruction signals and display commands issued by the central controller of the platform area; the control unit is used for receiving command signals issued by the central controller of the platform area after comprehensively analyzing the capacity allowance of the transformer of the current platform area and the battery capacity information of the electric vehicle and the client demand information uploaded by each charging pile, outputting control signals to the charging control circuit of the electric vehicle and controlling the charging state of the electric vehicle, and the control unit is used for receiving display commands issued by the central controller of the platform area and controlling the display unit to display corresponding information. The central controller of the transformer area collects the real-time electricity consumption information of the transformer area in the electricity consumption information collection system of the transformer area, analyzes the collected real-time electricity consumption information of the transformer area to obtain the capacity allowance of the transformer area of the current area, calculates the quantity of charging piles which are allowed to charge simultaneously according to the capacity allowance of the transformer area of the current area, receives the battery information of the electric automobile to be charged and the charging mode information selected by a customer and uploaded by each charging pile, performs comprehensive analysis on the quantity of the charging piles which are allowed to charge simultaneously and are calculated, sends corresponding command signals to the charging piles according to the set charging rules on the premise of not exceeding the capacity allowance of the transformer area, and the charging piles are used for receiving command signals issued by the central controller of the transformer area, controlling the power on or power off of a charging connector of the charging piles and controlling the power on or power off of the electric automobile connected with the charging connector. According to the invention, on the premise that the capacity allowance of the transformer in the transformer area is not exceeded, the electric automobile is charged by the capacity allowance of the transformer in the transformer area, so that the transformer special for the alternating-current charging station can be canceled, the occupation of land resources is reduced, the cost of purchasing the transformer and the land resources is greatly saved, and the construction cost and the expenditure of the alternating-current charging station are reduced.
The invention also has two charging mode functions of the sudden-charge mode and the intelligent charging mode, wherein the two functions respectively correspond to two charging prices, namely the sudden-charge mode charging price and the intelligent charging mode charging price. The charging price of the sudden-charge mode is higher than that of the intelligent charging mode, so that the charging price of the sudden-charge mode is higher than that of the intelligent charging mode, and the charging price of the sudden-charge mode is higher than that of the intelligent charging mode because the sudden-charge mode is preferential to occupy the charging power resource. Besides meeting the urgent needs of customers, people are encouraged to use the intelligent charging mode to evenly distribute charging power resources as much as possible. And after the electric power resources are allocated to the charging piles in the emergency charging mode, the central controller of the platform area allocates the residual electric power resources to the charging piles in the intelligent charging mode. The intelligent charging mode can distribute charging power resources relatively evenly, and because the charging power resources do not have priority, the charging time of the electric automobile is longer than that of the emergency charging mode, and therefore the charging price is lower than that of the emergency charging mode. Meanwhile, customers without urgent charging demands are encouraged to use the intelligent charging mode to charge as much as possible by price factors.
And because the power supply network corresponds to the peak valley period, the electricity prices of different periods are high or low. Therefore, when the charging price of the charging pile is designed, the charging price of the charging pile in the emergency charging mode and the charging price of the intelligent charging mode are also continuously changed by referring to the electricity price of the power supply network in the peak valley period. The method aims at shifting peaks and filling valleys by using price factors, reducing the load of a power grid and keeping power supply stable.
According to the invention, the charging state of the battery of the electric vehicle is controlled by comprehensively analyzing the power grid load state obtained by analyzing the power consumption information of the transformer area and the collection of the battery state information of the electric vehicle and combining the user charging mode selection requirement. When electricity consumption is low, the electric automobile is encouraged to sequentially queue to gradually access charging according to the electric quantity of the battery; in the case of peak electricity consumption, unless the user requires quick charging, the user does not need to charge, and the load on the power grid is not increased as much as possible. Therefore, under the condition that the transformer in the transformer area is not increased in capacity, a certain capacity of charging load can be provided for the electric automobile, and two main problems of urgent and urgent needs to be solved in popularization and application of the electric automobile are solved:
1. the electric vehicle is inconvenient to charge, and the resident has difficulty in building a charging pile;
2. the peak-valley difference of the electric automobile charging load unordered access aggravated power grid endangers the power grid safety.
Drawings
FIG. 1 is a schematic block diagram of a charging stake of the present invention;
FIG. 2 is a circuit diagram of a single chip microcomputer portion of a control circuit of the charging stake of the present invention;
FIG. 3 is a first embodiment of a circuit diagram of a communication module portion of a charging stake of the present invention;
FIG. 4 is a second embodiment of a circuit diagram of a communication module portion of a charging stake of the present invention;
FIG. 5 is a circuit diagram of a power supply portion of the central controller of the present invention;
FIG. 6 is a circuit diagram of a display portion of the central controller of the present invention;
fig. 7 is a main circuit diagram of an electric vehicle charging control circuit of the charging pile of the present invention;
fig. 8 is a primary control circuit diagram of an electric vehicle charging control circuit of the charging pile of the present invention;
fig. 9 is a secondary control circuit diagram of the electric vehicle charging control circuit of the charging pile of the present invention;
FIG. 10 is a schematic block diagram of a central controller of a cell of the present invention;
FIG. 11 is a general frame diagram of an electric vehicle charge control system of the present invention;
fig. 12 is a flowchart of an electric vehicle charging control method of the present invention.
Detailed Description
Referring to fig. 1 to 12, the invention discloses a control circuit of an alternating current charging pile based on transformer area load information, which comprises a control unit, a communication module, a power supply unit, an electric vehicle charging control circuit and an electric vehicle battery electric quantity acquisition circuit, wherein the power supply unit is used for supplying power to the control unit, the communication module, the electric vehicle charging control circuit, the electric vehicle battery electric quantity acquisition circuit, an instruction input unit and a display unit; the control unit is respectively and electrically connected with the communication module, the electric automobile battery electric quantity acquisition circuit, the electric automobile charging control circuit, the instruction input unit and the display unit; the electric automobile battery electric quantity acquisition circuit is used for acquiring electric automobile battery electric quantity and transmitting the electric automobile battery electric quantity to the control unit; the instruction input unit is used for collecting client demand information and transmitting the client demand information to the control unit. The client operation information includes charging mode information selected by the client and active stop charging instruction information. The control unit uploads electric quantity information of the battery of the electric automobile and customer demand information to the central controller of the platform area through the communication module, and receives instruction signals and display commands issued by the central controller of the platform area; the control unit is used for receiving command signals issued after the central controller of the transformer area comprehensively analyzes the capacity allowance of the transformer area of the current transformer area and the battery electric quantity information and the client demand information of the electric automobile uploaded by each charging pile, outputting control signals to the electric automobile charging control circuit, controlling the power on or power off of the charging connector and controlling the power on or power off of the electric automobile connected with the charging connector, so as to control the charging state of the electric automobile. The control unit is used for receiving a display command issued by the central controller of the platform area and controlling the display unit to display corresponding information.
When the battery of the electric automobile is full or the customer selects to actively stop charging, the charging pile controls the charging connector to be powered off, and the active stop charging instruction information operated by the customer is uploaded to the central controller of the platform area.
The power supply unit comprises a first power supply conversion circuit, a second power supply conversion circuit and a third power supply conversion circuit, wherein the first power supply conversion circuit is used for converting 220V alternating current power supply into 24V direct current power supply, the second power supply conversion circuit is used for converting 24V direct current power supply into 5V direct current power supply, and the third power supply conversion circuit is used for converting 5V direct current power supply into 3.3V direct current power supply. The communication module may be a wired communication module or a wireless communication module.
Preferably, the communication module adopts a power line carrier communication chip. The communication module comprises a power line carrier communication chip U1 with a model LM1893 and a transformer T1, wherein a primary coil of the transformer T1 is connected with a power line through a first capacitor C1, one end of a secondary coil of the transformer T1 is respectively connected with one end of a second capacitor C2, one end of a third capacitor C3 and a voltage VCC, the other end of the third capacitor C3 is grounded, the other end of the second capacitor C2 is respectively connected with the other end of the secondary coil of the transformer T1 and a first resistor R1, the other end of the first resistor R1 is respectively connected with a negative electrode of a voltage stabilizing tube VD, a collector electrode of a first triode Q1 and a 10 th pin of the power line carrier communication chip U1, an emitter electrode of the first triode Q1 is respectively connected with one end of the second resistor R2, one end of the third resistor R3 and an 8 th pin of the power line carrier communication chip U1, the other end of the third resistor R3 is grounded, the other end of the second resistor R2 is connected with the base electrode of the first triode Q1 and the 9 th pin of the power line carrier communication chip U1, the 1 st pin of the power line carrier communication chip U1 is connected with the 2 nd pin of the power line carrier communication chip U1 through a fourth capacitor C4, the 3 rd pin of the power line carrier communication chip U1 is connected with the 4 th pin of the power line carrier communication chip U1 through a sixth capacitor C6 and an eighth resistor R8 which are connected in series, the 5 th pin of the power line carrier communication chip U1 is grounded, the 6 th pin of the power line carrier communication chip U1 is grounded through a seventh capacitor C7, the 7 th pin of the power line carrier communication chip U1 is grounded through a fourth resistor R4, the 11 th pin of the power line carrier communication chip U1 is respectively connected with one end of the sixth resistor R6 and the base electrode of the second triode Q2, the other end of the sixth resistor R6 is connected with voltage VCC, the collector electrode of the second triode Q2 is connected with voltage VCC, the emitter of the second triode Q2 is connected with the 12 th pin of the power line carrier communication chip U1 through a seventh resistor R7, the 12 th pin and the 17 th pin of the power line carrier communication chip U1 are respectively connected with the control unit, the 13 th pin of the power line carrier communication chip U1 is grounded through an eighth resistor R8, the 14 th pin of the power line carrier communication chip U1 is grounded, the 15 th pin of the power line carrier communication chip U1 is connected with the voltage VCC, the 16 th pin of the power line carrier communication chip U1 is grounded through a fifth capacitor C5, and the 18 th pin of the power line carrier communication chip U1 is grounded through a 5 th resistor R5 and a potentiometer RP which are connected in series.
Of course, the structure of the communication module may also adopt the following structure: the communication module comprises a carrier chip and a carrier coupling circuit, wherein the carrier chip is electrically connected with the control unit, the carrier coupling circuit is electrically connected with the power line, a signal transmitting circuit and a signal receiving circuit are arranged between the carrier coupling circuit and the carrier chip, the input end of the signal transmitting circuit is connected with the carrier chip, the output end of the signal transmitting circuit is connected with the carrier coupling circuit, the input end of the signal receiving circuit is connected with the carrier coupling circuit, and the output end of the signal receiving circuit is connected with the carrier chip.
The signal transmitting circuit comprises a signal power amplifying circuit and an output power control circuit, the signal power amplifying circuit comprises a frequency selecting circuit composed of a fourth capacitor C4 and a first inductor L1, a first field effect tube Q1 and a second field effect tube Q2, the input end of the frequency selecting circuit is connected with a carrier coupling circuit, the output end of the frequency selecting circuit is connected with the drain electrode of the first field effect tube Q1 through a third resistor R3, the source electrode of the first field effect tube Q1 is connected with a reference ground VSS, the output end of the frequency selecting circuit is connected with the drain electrode of the second field effect tube Q2 through a second resistor R2, the source electrode of the second field effect tube Q2 is connected with one end of the fourth resistor R4, the cathode of the first diode D1 and one end of the output power control circuit, the other end of the fourth resistor R4, the anode of the first diode D1 and the grid electrode of the second field effect tube Q2 and one end of a fifth capacitor C5, the other end of the fifth capacitor C5 is respectively connected with the grid electrode of the first field effect tube Q1 and one end of a fifth resistor R5, the other end of the fifth resistor R5 is connected with a carrier chip, the output power control circuit comprises a triode Q3, an emitter of the triode Q3 is connected with power supply voltage, a collector of the triode Q3 is respectively connected with the positive electrode of a seventh capacitor C7, one end of a sixth capacitor C6, one end of a sixth resistor R6 and a signal power amplifying circuit, a negative electrode of the seventh capacitor C7, the other end of the sixth capacitor C6 and the other end of the sixth resistor R6 are connected with a reference ground VSS, a base of the triode Q3 is respectively connected with one end of the seventh resistor R7 and one end of an eighth resistor R8, the other end of the eighth resistor R8 is connected with the power supply voltage, and the other end of the seventh resistor R7 is connected with the reference ground VSS.
The signal receiving circuit comprises a signal filtering circuit and a demodulation circuit, the signal filtering circuit comprises a band-pass passive filter formed by a second inductor L2, an eighth capacitor C8, a third inductor L3 and a ninth capacitor C9, a ninth resistor R9, a second diode D2 and a third diode D3, one end of the ninth resistor R9 is connected with a carrier coupling circuit, the other end of the ninth resistor R9 is connected with one end of the second inductor L2, the other end of the second inductor L2 is connected with one end of the eighth capacitor C8, the other end of the eighth capacitor C8 is respectively connected with one end of the third inductor L3, one end of the ninth capacitor C9, the positive electrode of the second diode D2, the negative electrode of the third diode D3 and the demodulation circuit, the other end of the third inductor L3, the other end of the ninth capacitor C9, the negative electrode of the second diode D2 and the positive electrode of the third diode D3 are grounded, the demodulation circuit comprises a low-power-consumption narrow-band analog front end with the model number of AFE3361, a 16 th pin of the low-power-consumption narrow-band analog front end with the model number of AFE3361 is connected with the signal filtering circuit through a sixteenth capacitor C16, a 1 st pin of the low-power-consumption narrow-band analog front end with the model number of AFE3361 is connected with one end of a seventeenth capacitor C17, the other end of the seventeenth capacitor C17 is connected with one end of a fourth inductor L4, one end of an eighteenth capacitor and one end of a fifteenth resistor respectively, the other end of the fourth inductor L4 and the other end of the eighteenth capacitor are grounded, and the other end of the fifteenth resistor is connected with a carrier chip.
The instruction input unit and the display unit adopt touch screens.
The electric automobile charging control circuit comprises a contactor and a relay, wherein the charging connector is connected with alternating current through the contactor, one end of a contact of the contactor is connected with the charging connector, the other end of the contact of the contactor is connected with a power line, the power on or power off of a coil of the contactor is controlled by the relay, and the relay is controlled by the control unit. The control unit is a singlechip. The singlechip drives the relay through ULN2803 LW.
The electric automobile battery electric quantity acquisition circuit can adopt the electric quantity acquisition device with the existing charging pile.
The invention discloses an alternating current charging pile based on transformer area load information, which comprises a charging pile body, wherein the charging pile body is provided with a charging connector for being electrically connected with an electric automobile, the charging pile body is provided with a control circuit, and the charging connector is connected with alternating current through the electric automobile charging control circuit. Each charging post may be provided with a charging connector or a plurality of charging connectors. Each charging pile of the present embodiment is provided with two charging connectors. The charging pile is also provided with a charging indicating circuit, and the charging indicating circuit indicates whether each charging connector is electrified or not by adopting a light emitting diode. Of course, the charging pile of the invention can also have the functions of card swiping and consumption and the functions of printing receipt, and in a word, the charging pile of the invention has various functions of the existing charging pile besides the functions of the invention.
The central controller of the platform area is provided with a control unit and a power supply unit, the power supply unit is used for supplying power to the whole controller, the control unit is connected with a power line through a carrier communication module and is used for sending instruction signals and display commands to the charging piles and receiving various information uploaded by the charging piles, the control unit is connected with a power consumption information acquisition system or 485 port of a platform area electric energy meter through a carrier communication module or 485 communication circuit and is used for acquiring real-time power consumption information of the platform area in the power consumption information acquisition system, the control unit is used for analyzing the acquired real-time power consumption information of the platform area to obtain the capacity allowance of a transformer of the current area, the control unit is used for calculating the quantity of the charging piles which are allowed to simultaneously perform charging operation at present according to the capacity allowance of the transformer of the current area, the control unit is used for receiving the battery quantity information of the electric automobile to be charged and the charging mode information selected by a customer, comprehensively analyzing the quantity of the charging piles which are allowed to be simultaneously performed at present and the calculated charging piles, and sending corresponding instructions to the control signals to the charging piles according to the set charging rules on the premise of not exceeding the capacity allowance of the platform area, and displaying the current charge pile quantity of the charging piles which are allowed to be charged simultaneously, and the charging piles which are connected with the charging piles which are required to be charged. The premise of not exceeding the capacity allowance of the transformer in the area is that the central controller in the area can only send N charging instructions at most, N is the number of charging piles which allow charging work to be carried out simultaneously at present, namely the central controller in the area can only control N electric vehicles to be charged simultaneously at most, and in particular, the method for selecting the electric vehicles to charge is determined according to the charging mode selected by a customer and the charging rule set by the active stopping charging instructions in a matching mode. And the central controller of the platform area decides the current charging price of the emergency charging mode and the charging price of the intelligent charging mode according to the designed price decision, sends out relevant display information to order the charging pile, controls a display in the charging pile to display the charging price, and carries out pricing according to the price. Preferably, the control unit is a single-chip microcomputer. The carrier communication module of this embodiment adopts a chip with model LM 1893. The central controller of the platform area is also provided with an instruction input unit and a display unit, and the instruction input unit and the display unit are electrically connected with the control unit. Preferably, the instruction input unit and the display unit adopt LCD touch screens.
The charging rules set in the central controller of the platform area are as follows: allowing a customer to select a sudden charging mode and an intelligent charging mode, setting the charging electricity price of the sudden charging mode to be higher than that of the intelligent charging mode, and distributing the residual power resources to the electric vehicle requesting the intelligent charging mode after distributing the power resources to the electric vehicle requesting the sudden charging mode by the central controller of the platform area; if the customer selects the quick charging mode, on the premise of not exceeding the capacity allowance of the transformer in the transformer area, allowing the sequence of the sufficient number of charging piles for receiving the quick charging command to continuously charge the electric automobile requesting the quick charging mode until the battery of the electric automobile requesting the quick charging mode is full or the customer actively stops charging; if the customer selects the intelligent charging mode, on the premise of not exceeding the capacity allowance of the transformer in the transformer area, allowing a sufficient number of charging piles to intermittently charge the electric automobile requesting the intelligent charging mode according to the sequence from low to high of the electric quantity of the electric automobile battery to be charged, wherein random selection exists in the slow charging process until the electric automobile battery is full or the customer actively stops charging. The boost mode is used for meeting the requirements of customers who are in urgent need of charging the electric automobile.
The central controller of the platform area selects electric vehicles requiring the intelligent charging mode to charge according to the sequence from low battery power to high from the obtained battery power information of the electric vehicles requiring the intelligent charging mode, when a certain battery power position is touched to correspond to a plurality of electric vehicles, if the number of the electric vehicles which are allowed to be slowly charged currently is larger than or equal to the number of the electric vehicles corresponding to the battery power position, all the electric vehicles corresponding to the battery power position are selected to charge, and if the number of the electric vehicles which are allowed to be slowly charged currently is smaller than the number of the electric vehicles corresponding to the battery power position, the electric vehicles with the required number are randomly selected from the electric vehicles corresponding to the battery power position to charge; and the central controller of the platform area selects the electric automobile which requests the quick charge mode to charge according to the sequence of receiving the quick charge command.
For example: assuming that the capacity allowance of the transformer in the current transformer area allows 12 charging piles to be charged, 17 electric automobiles need to be charged. Wherein 2 electric vehicles needing charging urgently select a sudden charging mode. Then the rest 15 electric automobiles can only be buffered for ten. Of the 15 electric vehicles, 5 electric vehicles with 15%, 20% and 25% of electric power remain. According to the rule of intelligent charging mode, the number of 5 electric vehicles with 15% of electric quantity is smaller than 10 alternating-current charging piles allowing the buffering, and all 5 electric vehicles can be charged. The number of the 5 electric vehicles with 20% of electric quantity is equal to the number of the 5 alternating current charging piles with the allowable slow charging, and all the 5 electric vehicles can be charged. And 5 electric automobiles with 25% of electric quantity remained wait for charging. Assuming that after a period of charging, all 10 electric vehicles charge 5% of the electric quantity. At this time, there are 5 electric vehicles with 20% of electric quantity left, and 10 electric vehicles with 25% of electric quantity left. According to the rule of intelligent charging mode, the number of 5 electric vehicles with 20% of electric quantity is smaller than the number of the AC charging piles allowing the buffer charging, and all 5 electric vehicles can be charged. The electric automobile with 25% of the residual electric quantity has 10 electric automobiles, and the number of the electric automobiles is 5 which is greater than the number of the residual alternating current charging piles which allow the slow charging, so that 5 electric automobiles are randomly selected from the 10 electric automobiles to be charged. And the method is repeated in a circulating way until the electric quantity of the electric automobile is full or the customer actively stops charging.
And if 12 electric vehicles needing charging urgently, selecting a sudden charging mode. Then 12 electric vehicles which are needed to be charged urgently are charged. If 17 electric vehicles needing to be charged suddenly select a sudden charging mode, selecting 12 electric vehicles needing to be charged suddenly according to the sequence of receiving the sudden charging command to charge until the electric vehicles are full of electric quantity or a customer stops charging actively.
The charging pile charging price adopts a floating price, and two charging prices are designed on the basis, namely a sudden charging mode charging price and an intelligent charging mode charging price, wherein the sudden charging mode charging price is higher than the intelligent charging mode charging price (the price difference of the two electricity prices is determined by relevant national policies). Of course, other charging modes can be set according to actual needs.
1) Floating price
The power supply network has peak valley period, and the electricity prices of different periods are high or low. Therefore, when designing the charging price of the alternating-current charging pile, the charging price of the alternating-current charging pile emergency charging mode and the charging price of the intelligent charging mode are also continuously changed by referring to the electricity price of the power supply network in the peak valley period as a basis. The method aims at shifting peaks and filling valleys by using price factors, reducing the load of a power grid and keeping power supply stable.
2) Charging price in rapid charging mode
The charging price of the sudden charging mode is increased on the basis of the floating price, and the charging price of the corresponding intelligent charging mode is higher.
This is to meet the customer's demand for charging electric vehicles in particular, but at the same time, the price is raised because the charging power resources are preferentially occupied. Besides meeting the urgent needs of customers, people are encouraged to use the intelligent charging mode to evenly distribute charging power resources as much as possible.
3) Intelligent charging price in charging mode
The intelligent charging mode charging price is increased on the basis of the floating price, and the intelligent charging mode charging price is lower.
The intelligent charging mode can distribute charging power resources relatively evenly, and because the charging power resources do not have priority, the charging time of the electric automobile is longer than that of the emergency charging mode, and therefore the charging price is lower than that of the emergency charging mode. Meanwhile, customers without urgent charging demands are encouraged to use the intelligent charging mode to charge as much as possible by price factors.
The central controller of the platform area is equivalent to the brain of the whole system, gathers information to carry out logic judgment, and issues a command after a conclusion is obtained. The electricity consumption information acquisition system comprises a table zone summary table and a user electricity meter. The central controller of the platform region collects the real-time electricity consumption information of the platform region (the current regional electricity consumption information) from the total table of the platform region through RS485, analyzes the real-time electricity consumption information of the platform region to obtain the capacity allowance of the transformer of the current regional platform region, and calculates the number of the alternating-current charging piles capable of simultaneously carrying out charging work. Because the electric power resources for charging the electric automobile in the charging piles come from the capacity allowance of the transformer in the transformer area, the electric power resources are limited, and all the charging piles cannot charge, the electric power source can affect the common domestic electricity. Therefore, the number of the charging piles capable of performing charging work is required to be flexibly controlled according to the capacity allowance of the transformer in the current transformer area.
For example:
there is one transformer with 315KVA capacity, and after the current domestic electricity is removed, the current capacity of the transformer is remained for 50KVA. One charging pile outputs a voltage AC380V, and outputs a current 12A. According to the formula
P=UI
The apparent power of one charging pile is 4560VA, namely 4.56KVA.
The number of charging piles that can perform the charging operation is about:
50KVA/4.56KVA ≡10.96 (each)
The maximum number of charging piles that can simultaneously perform the charging operation is 10.
The selection of the charging mode is determined by the customer according to the requirements, and the operation interface in the charging pile is operated. And then collecting the operation information of the clients. When the charging connector is inserted into an electric vehicle, the charging pile automatically starts to collect electric vehicle battery electric quantity information. The main application of the information acquisition is that battery electric quantity information is needed to be used as a basis in random selection charging when in an intelligent charging mode. And the charging piles which perform charging work within the allowable quantity range are charged according to charging rules corresponding to different charging modes. Meanwhile, if the intelligent charging mode is adopted or the battery is fully charged and stopped, the collected battery electric quantity information is used as a logic judgment basis.
The central controller of the station area and the electricity consumption information acquisition system are in wired connection, and are communicated through RS 485. The power consumption information collection system unidirectionally transmits the real-time power consumption information of the platform area to the central controller of the platform area. The central controller of the station area communicates with the charging piles in the form of radio waves by adopting carrier communication. The communication content among them is more, relate to the electric automobile battery electric quantity information, customer's operation information (quick charge mode, intelligent charge mode, stop charging) that the stake of exchanging uploads to the central controller of district, expense settlement information. The central controller of the platform area displays different charging commands sent by the controller, the total number and the residual quantity of the alternating-current charging piles capable of currently carrying out charging work sent by the display in the alternating-current charging piles, the current quick charging mode charging price, the intelligent charging mode charging price display command and the like.
The invention discloses an electric automobile charging control system composed of an alternating current charging pile and a central controller of a platform, and the control method comprises the following steps:
1) Setting a sudden-charge mode and an intelligent charging mode, wherein the two charging modes respectively correspond to two charging prices, namely a sudden-charge mode charging price and an intelligent charging mode charging price, and the sudden-charge mode charging price is higher than the intelligent charging mode charging price;
2) The central controller of the station area collects real-time electricity utilization information of the station area in the electricity utilization information collection system in real time, analyzes the collected real-time electricity utilization information of the station area to obtain the capacity allowance of a transformer of the station area of the current area, calculates the number of charging piles which are currently allowed to simultaneously perform charging work according to the capacity allowance of the transformer of the current station area, sends out related display information commands to the charging piles, and controls a display of the charging piles to display the total number and the residual number of the charging piles which can currently perform charging work and the predicted charging completion time of each pile (prediction is performed according to the past load change rule);
3) The central controller of the station area refers to the electricity price of the peak valley period of the power supply network, determines the current charging price of the emergency charging mode and the charging price of the intelligent charging mode, sends out related display information commands to the charging piles, controls the display of the charging piles to display the charging price, and carries out pricing according to the price;
4) The customer selects a charging mode through an operation interface, connects a charging connector with the electric automobile to be charged, automatically collects the electric quantity of the battery of the electric automobile by a charging pile, and uploads the electric quantity of the battery of the electric automobile and the charging mode information selected by the customer to a central controller of a platform area;
5) The central controller of the transformer area receives the battery power information of the electric automobile to be charged and the charging mode information selected by the customer and uploaded by each charging pile, and comprehensively analyzes the battery power information and the charging mode information with the calculated number of the charging piles which are allowed to simultaneously charge, and respectively sends charging instructions to the corresponding charging piles according to a set charging rule on the premise of not exceeding the capacity allowance of the transformer area, so that the charging piles are controlled to charge the electric automobile until the battery power of the electric automobile is full or the customer actively stops charging;
6) When the battery of the electric automobile is full or the customer actively stops charging, the central controller of the platform area sends a charging stopping instruction to the corresponding charging pile, and the charging pile stops charging the electric automobile;
7) And stopping charging the electric automobile by the charging pile, stopping pricing, and settling the cost.
And after the charging instruction is issued, charging the charging connector after being electrified. After the charging instruction is issued, the charging connector stops charging after being powered off, and the charging connector starts to charge after stopping charging, and the charging is carried out by combining the charge standards of various charging modes with the charge quantity.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the invention, and it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims (7)

1. A control circuit of an alternating current charging pile based on transformer area load information is characterized in that: the electric vehicle battery power supply device comprises a control unit, a communication module, a power supply unit, an electric vehicle charging control circuit and an electric vehicle battery power acquisition circuit, wherein the power supply unit is used for supplying power to the control unit, the communication module, the electric vehicle charging control circuit and the electric vehicle battery power acquisition circuit; the control unit is respectively and electrically connected with the communication module, the electric automobile battery electric quantity acquisition circuit, the electric automobile charging control circuit, the instruction input unit and the display unit; the communication module adopts a power line carrier communication chip, the communication module comprises a power line carrier communication chip U1 with a model LM1893 and a transformer T1, a primary coil of the transformer T1 is connected with a power line through a first capacitor C1, one end of a secondary coil of the transformer T1 is respectively connected with one end of a second capacitor C2, one end of a third capacitor C3 and a voltage VCC, the other end of the third capacitor C3 is grounded, the other end of the second capacitor C2 is respectively connected with the other end of a secondary coil of the transformer T1 and a first resistor R1, the other end of the first resistor R1 is respectively connected with a negative electrode of a voltage stabilizing tube VD, a collector of a first triode Q1 and a 10 th pin of the power line carrier communication chip U1, an emitter of the first triode Q1 is respectively connected with one end of the second resistor R2, one end of the third resistor R3 and an 8 th pin of the power line carrier communication chip U1, the other end of the third resistor R3 is grounded, the other end of the second resistor R2 is connected with the base electrode of the first triode Q1 and the 9 th pin of the power line carrier communication chip U1, the 1 st pin of the power line carrier communication chip U1 is connected with the 2 nd pin of the power line carrier communication chip U1 through a fourth capacitor C4, the 3 rd pin of the power line carrier communication chip U1 is connected with the 4 th pin of the power line carrier communication chip U1 through a sixth capacitor C6 and an eighth resistor R8 which are connected in series, the 5 th pin of the power line carrier communication chip U1 is grounded, the 6 th pin of the power line carrier communication chip U1 is grounded through a seventh capacitor C7, the 7 th pin of the power line carrier communication chip U1 is grounded through a fourth resistor R4, the 11 th pin of the power line carrier communication chip U1 is respectively connected with one end of the sixth resistor R6 and the base electrode of the second triode Q2, the other end of the sixth resistor R6 is connected with the voltage VCC, the collector electrode of the second triode Q2 is connected with the voltage VCC, the emitter of the second triode Q2 is connected with the 12 th pin of the power line carrier communication chip U1 through a seventh resistor R7, the 12 th pin and the 17 th pin of the power line carrier communication chip U1 are respectively connected with the control unit, the 13 th pin of the power line carrier communication chip U1 is grounded through an eighth resistor R8, the 14 th pin of the power line carrier communication chip U1 is grounded, the 15 th pin of the power line carrier communication chip U1 is connected with a voltage VCC, the 16 th pin of the power line carrier communication chip U1 is grounded through a fifth capacitor C5, and the 18 th pin of the power line carrier communication chip U1 is grounded through a fifth resistor R5 and a potentiometer RP which are connected in series; or the communication module comprises a carrier chip and a carrier coupling circuit, wherein the carrier chip is electrically connected with the control unit, the carrier coupling circuit is electrically connected with the power line, a signal transmitting circuit and a signal receiving circuit are arranged between the carrier coupling circuit and the carrier chip, the input end of the signal transmitting circuit is connected with the carrier chip, the output end of the signal transmitting circuit is connected with the carrier coupling circuit, the input end of the signal receiving circuit is connected with the carrier coupling circuit, and the output end of the signal receiving circuit is connected with the carrier chip; the electric automobile battery electric quantity acquisition circuit is used for acquiring electric automobile battery electric quantity and transmitting the electric automobile battery electric quantity to the control unit; the instruction input unit is used for collecting client demand information and transmitting the client demand information to the control unit; the control unit is used for uploading electric quantity information of the battery of the electric automobile and customer demand information to the central controller of the platform area through the communication module, and receiving instruction signals and display commands issued by the central controller of the platform area; the control unit is used for receiving command signals issued by the central controller of the platform area after comprehensively analyzing the capacity allowance of the transformer of the current platform area and the battery capacity information of the electric vehicle and the client demand information uploaded by each charging pile, outputting control signals to the charging control circuit of the electric vehicle and controlling the charging state of the electric vehicle, and the control unit is used for receiving display commands issued by the central controller of the platform area and controlling the display unit to display corresponding information.
2. The control circuit of an ac charging stake as recited in claim 1, wherein: the signal transmitting circuit comprises a signal power amplifying circuit and an output power control circuit, the signal power amplifying circuit comprises a frequency selecting circuit composed of a fourth capacitor C4 and a first inductor L1, a first field effect tube Q1 and a second field effect tube Q2, the input end of the frequency selecting circuit is connected with a carrier coupling circuit, the output end of the frequency selecting circuit is connected with the drain electrode of the first field effect tube Q1 through a third resistor R3, the source electrode of the first field effect tube Q1 is connected with a reference ground VSS, the output end of the frequency selecting circuit is connected with the drain electrode of the second field effect tube Q2 through a second resistor R2, the source electrode of the second field effect tube Q2 is connected with one end of the fourth resistor R4, the cathode of the first diode D1 and one end of the output power control circuit, the other end of the fourth resistor R4, the anode of the first diode D1 and the grid electrode of the second field effect tube Q2 and one end of a fifth capacitor C5, the other end of the fifth capacitor C5 is respectively connected with the grid electrode of the first field effect tube Q1 and one end of a fifth resistor R5, the other end of the fifth resistor R5 is connected with a carrier chip, the output power control circuit comprises a triode Q3, an emitter of the triode Q3 is connected with power supply voltage, a collector of the triode Q3 is respectively connected with the positive electrode of a seventh capacitor C7, one end of a sixth capacitor C6, one end of a sixth resistor R6 and a signal power amplifying circuit, a negative electrode of the seventh capacitor C7, the other end of the sixth capacitor C6 and the other end of the sixth resistor R6 are connected with a reference ground VSS, a base of the triode Q3 is respectively connected with one end of the seventh resistor R7 and one end of an eighth resistor R8, the other end of the eighth resistor R8 is connected with the power supply voltage, and the other end of the seventh resistor R7 is connected with the reference ground VSS.
3. The control circuit of an ac charging stake as recited in claim 1, wherein: the signal receiving circuit comprises a signal filtering circuit and a demodulation circuit, the signal filtering circuit comprises a band-pass passive filter formed by a second inductor L2, an eighth capacitor C8, a third inductor L3 and a ninth capacitor C9, a ninth resistor R9, a second diode D2 and a third diode D3, one end of the ninth resistor R9 is connected with a carrier coupling circuit, the other end of the ninth resistor R9 is connected with one end of the second inductor L2, the other end of the second inductor L2 is connected with one end of the eighth capacitor C8, the other end of the eighth capacitor C8 is respectively connected with one end of the third inductor L3, one end of the ninth capacitor C9, the positive electrode of the second diode D2, the negative electrode of the third diode D3 and the demodulation circuit, the other end of the third inductor L3, the other end of the ninth capacitor C9, the negative electrode of the second diode D2 and the positive electrode of the third diode D3 are grounded, the demodulation circuit comprises a low-power-consumption narrow-band analog front end with the model number of AFE3361, a 16 th pin of the low-power-consumption narrow-band analog front end with the model number of AFE3361 is connected with the signal filtering circuit through a sixteenth capacitor C16, a 1 st pin of the low-power-consumption narrow-band analog front end with the model number of AFE3361 is connected with one end of a seventeenth capacitor C17, the other end of the seventeenth capacitor C17 is connected with one end of a fourth inductor L4, one end of an eighteenth capacitor and one end of a fifteenth resistor respectively, the other end of the fourth inductor L4 and the other end of the eighteenth capacitor are grounded, and the other end of the fifteenth resistor is connected with a carrier chip.
4. The control circuit of an ac charging stake as recited in claim 1, wherein: the electric automobile charging control circuit comprises a contactor and a relay, the charging connector is connected with alternating current through the contactor, one end of a contact of the contactor is connected with the charging connector, the other end of the contact of the contactor is connected with a power line, the power on or power off of a coil of the contactor is controlled by the relay, and the relay is controlled by the control unit.
5. The control circuit of an ac charging stake as recited in claim 1, wherein: the instruction input unit and the display unit adopt touch screens.
6. The control circuit of an ac charging stake as recited in claim 1, wherein: the control unit is a singlechip.
7. The utility model provides an alternating current charging stake based on transformer platform district load information, includes the charging stake body, the charging stake body is equipped with the charging connector that is used for being connected with electric automobile electricity, its characterized in that: the charging pile body is provided with the control circuit of any one of claims 1 to 6, and the charging connector is connected with alternating current through an electric automobile charging control circuit.
CN201710772180.9A 2017-08-31 2017-08-31 Alternating-current charging pile based on transformer area load information and control circuit thereof Active CN107394857B (en)

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