CN102903186B - Electromobile charging pile and operating method thereof - Google Patents

Abstract

The invention provides an electromobile charging pile and an operating method thereof. The charging pile comprises a control unit, an energy storage module, a communication module, an energy scheduling module and an output interface, wherein the control unit is connected with the communication module, the energy scheduling module and the output interface, and the energy storage module and the energy scheduling module are connected with each other; the energy storage module stores electric energy; the communication module communicates with a distribution network system and receives a command of the distribution network system, wherein the command of the distribution network system includes the network load situation; the energy scheduling module determines an electric energy supplement source of the charging pile according to the network load situation, the energy storage module situation and the user need; and the output interface determines the electric energy supplement source according to the energy scheduling module and outputs the power of the grid or the power provided by the grid and energy storage module to the electromobile of a user.

Description

A kind of electric vehicle charging pile and its operation method

technical field

The invention relates to the technical field of electric vehicle charging and swapping, in particular to an electric vehicle charging pile and an operating method thereof.

Background technique

Electric vehicles, especially pure electric vehicles, use electricity as energy, have the advantages of low emissions and high energy efficiency, and are the main choice to replace fuel vehicles. In the context of increasingly prominent global energy and environmental problems, the development of electric vehicles has become an important way to get rid of dependence on oil resources, achieve energy conservation and emission reduction, and alleviate energy and environmental problems. One of the core technologies of electric vehicles is the energy storage and supply system. The use of batteries and rapid replacement technology and electric vehicle charging and swapping station technology have become the key technologies for the industrialization of electric vehicles.

Some difficulties and problems in the construction of service network infrastructure such as charging and swapping stations in the existing technology have increasingly restricted the construction of the entire operation service network. The problems in the existing technology include: 1. Urban land shortage, electric vehicles The construction of charging and swapping stations is faced with the problem of how to reduce the occupied area as much as possible, increase the effective use area, and optimize the planning of electric vehicle service network; 2. The construction of electric vehicle charging and swapping stations needs to go through the preliminary planning and site selection, land acquisition and approval, and the mid-term foundation The three basic stages of building construction, equipment installation and commissioning in the later stage, the overall construction cycle takes a long time; 3. The power battery of electric vehicles is subject to operating environmental factors, and the battery charging and storage environment of the charging and swapping stations currently under construction is not ideal. Good constant temperature, low humidity, ventilation and dust-proof effects have not yet been achieved. The power battery has been in a relatively open environment for a long time, and is easily affected by seasonal factors and vehicle damage. The service life is short, and the charging and discharging efficiency is unstable.

Contents of the invention

An electric vehicle charging pile provided by the present invention, the charging pile includes a control unit, an energy storage module, a communication module, an energy scheduling module, and an output interface, and the control unit controls and connects the communication module, the energy scheduling module, and the output interface , the energy storage module and the energy scheduling module are connected to each other; the energy storage module stores electric energy; the communication module communicates with the distribution network system and accepts instructions from the distribution network system, and the distribution network system The instruction includes the load condition of the power grid; the energy dispatch module determines the power supply source of the charging pile according to the load condition of the power grid, the energy storage module and user demand; the output interface determines the power supply source according to the energy dispatch module The power provided by the grid or the grid and the energy storage module is output to the user's electric vehicle.

In the first preferred embodiment provided by the present invention: the communication module includes a GPRS interface, an Ethernet interface supporting TCP/IP, a CAN bus communication interface, a PLC communication interface, a Zigbee bus communication interface and 3G, 4G wireless communication interfaces.

In the second preferred embodiment provided by the present invention: the charging pile includes a billing and metering module and a card swiping module;

The billing and metering module includes an energy storage module energy billing module and an electric vehicle charging energy billing module;

The energy storage module energy billing module is used to charge the energy of the energy storage module when the energy storage module participates in the charging work;

The electric vehicle charging energy billing module is used to charge the energy charged by the user's electric vehicle according to the energy storage module energy billing module and the power consumption of the grid;

The card swiping module is used to identify the identity of the user's electric vehicle when the user's electric vehicle starts charging, and settle the charge for the energy charged by the electric vehicle calculated by the billing and metering module after the charging is completed.

In the third preferred embodiment provided by the present invention: the charging pile includes a man-machine interface module;

The man-machine interface module includes a display screen, and the display screen shows the information of charging process voltage, power and current, charging time and charging cost to the user.

In the fourth preferred embodiment provided by the present invention: the charging pile includes a charging process protection module, and the charging process protection module performs leakage protection and overcurrent protection for the charging pile and the user's electric vehicle.

In the fifth preferred embodiment provided by the present invention: the energy storage module is used to use the power grid or solar energy to store electric energy when the power grid is at a low point, including a charge and discharge control unit, a photovoltaic power generation module, a PWM module, a DC/DC module A, A DC/DC module B and an energy storage unit, the energy scheduling module is connected to the charge and discharge control unit, the energy storage unit and the DC/DC module A;

The photovoltaic power generation module converts the sun’s light energy into electrical energy, converts the fixed DC voltage into a variable DC voltage through the DC/DC module A, and sends it to the energy storage unit for storage;

The charging and discharging control unit controls and connects the PWM module and the DC/DC module B, and the electric energy transmitted to the energy storage module at the time of the power grid low-fall time passes through the PWM module to convert alternating current into direct current, and through the DC/DC Module B transforms the fixed DC voltage into a variable DC voltage and sends it to the energy storage unit for storage.

In the sixth preferred embodiment provided by the present invention: the energy storage unit includes a power battery and a super capacitor, and the power battery is a power lithium battery;

The capacity Q of the power lithium battery is:

Among them, U _2l is the voltage of the power battery on the vehicle, t is the charging time, h is the correction value of the charging time, U _1l is the terminal voltage of the energy storage module corresponding to the SOC of the energy storage battery being 15%;

The capacitance C of the supercapacitor is:

$\mathrm{<span\; class="notranslate">\; C</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; [</span><span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; I</span>}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; UI</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; \&Delta;t</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; u</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; I</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; \&Delta;I</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; \&Delta;t</span>}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; u</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; I</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>\mathrm{<span\; class="notranslate">\; \&Delta;I</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; \&Delta;t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; ]</span>}{{\mathrm{<span\; class="notranslate">\; u</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}$

为恒压阶段等分的小的时间段的份数，t为恒压阶段总时长。Among them, U ₂ is the terminal voltage of the power battery when the constant current stage changes to the constant voltage stage during the charging process, U ₁ is the starting voltage of the power battery charging, I is the current value in the constant current stage, ΔI is the step size of the current drop in the constant voltage process, t ₁ is the constant current charging time, Δt is the time corresponding to the current drop ΔI,

is the number of small time periods equally divided in the constant pressure stage, and t is the total duration of the constant pressure stage.

The seventh preferred embodiment provided by the present invention provides a charging pile operation method, the charging pile includes the charging pile provided by the present invention, and the method includes:

Step S1, the charging pile starts charging according to the charging demand of the user's electric vehicle;

Step S2, judging whether an instruction from the distribution network system has been received, if yes, execute step S3, if no, use the electric energy of the grid to directly charge the user's electric vehicle according to the charging demand of the user's electric vehicle;

Step S3, calculate the load difference, the load difference is the difference between the charging demand of the user's electric vehicle and the load that the grid can provide, and judge whether the load difference is a positive value, if yes, execute step S4, if no, According to the charging demand of the user's electric vehicle, the electric energy of the grid is used to directly charge the user's electric vehicle;

Step S4, determining the discharge current of the energy storage module according to the rated power of the on-board charger and the acceptable discharge rate of the energy storage module.

In the eighth preferred embodiment provided by the present invention: after the step S4 determines the start time point when the energy storage module of the charging pile is used as the charging power source, the process of charging the user's electric vehicle by the energy storage module includes:

Step S401, judging whether the SOC value of the power battery of the energy storage module is greater than the recommended value, if yes, execute step S402; if no, execute step S403;

Step S402, the energy storage module charges the user's charging car until the charging process ends, and continuously judges whether the SOC value of the power battery is greater than the recommended value during the charging process, and once the SOC value of the power battery is not greater than the recommended value, execute step S403;

Step S403 , judging whether the user's electricity demand is currently met, and if not, apply for a charging load to the superior monitoring system for AC charging of the user's electric vehicle.

In the ninth preferred embodiment provided by the present invention: setting the SOC value of the power battery to be greater than the suggested value is to avoid deep discharge of the battery, and the suggested value is 15%.

In the tenth preferred embodiment provided by the present invention: in the step S402, the energy storage module charges the charging vehicle for the user and at the same time detects whether the power grid is in a peak period at this time, and if it is in a peak period, stop all The energy storage module charges the user's charging car, uses the power grid to charge the user's charging car, and if the power grid is always at a peak load during the charging process, uses the energy storage module to charge the user Car charging.

In the eleventh preferred embodiment provided by the present invention: when it is judged in step S403 that the user's demand for electricity is met, step S5 is executed to charge the energy storage module.

In the twelfth preferred embodiment provided by the present invention: it is judged in real time whether the energy storage module meets the energy storage requirement, and if not, step S5 is performed to charge the energy storage module.

In the thirteenth preferred embodiment provided by the present invention: the step S5 includes:

Step S501, determine whether the photovoltaic power generation module can work, if yes, execute step S502, if no, charge the energy storage module through the grid when the load condition of the grid allows charging the energy storage module, execute step S504;

Step S502, judging whether the power grid is charging the energy storage module, and if so, stopping the power grid from charging the energy storage module, and performing step S503;

Step S503, start the photovoltaic power generation module to charge the energy storage module, and execute step S504;

Step S504, stop charging when the energy storage requirement of the energy storage module is met.

The beneficial effects of an electric vehicle charging pile and its operating method provided by the present invention include:

1. The electric vehicle charging pile and its operation method provided by the present invention, the charging pile includes an energy storage module and a communication module, is controlled by the same management platform for management, accepts the instructions of the distribution network system, and does not meet the requirements of the electric vehicle due to grid reasons. When the car needs to be charged, the energy storage module can be used to charge the user's electric car and actively participate in the friendly interaction with the power grid.

2. The charging pile also includes an energy scheduling module, which determines the source of electric energy supply for the charging pile according to the grid load, the energy storage module, and the user's needs.

3. The energy storage module can use the power grid or solar energy to store electric energy when the power grid is at a low point.

4. The charging pile includes a billing and metering module, a card swiping module, a human-machine interface module and a charging process protection module. The billing and metering module is used to bill the energy charged by the user's electric vehicle, and the card swiping module is used to verify the identity of the user's electric vehicle. Identify and settle the charge of the energy charged by the electric vehicle after charging; the human-machine interface module displays information such as voltage, power and current, charging time, charging cost and other information during the charging process to the user; the protection module performs leakage protection and over-current protection during the charging process Protect.

Description of drawings

Fig. 1 is a schematic structural diagram of a charging pile provided by the present invention;

Fig. 2 is a schematic structural diagram of an embodiment of a charging pile provided by the present invention;

Fig. 3 is a method flowchart of a charging pile operation method provided by the present invention;

Fig. 4 is the flowchart of charging the user's electric vehicle by the energy storage module provided by the present invention;

Fig. 5 is a flow chart of charging the energy storage module provided by the present invention.

Detailed ways

An electric vehicle charging pile and its operation method provided by the present invention, the structural diagram of the charging pile is shown in Figure 1, including a control unit, an energy storage module, a communication module, an energy scheduling module and an output interface, and the control unit controls the connection communication module, the energy scheduling module and the output interface, and the energy storage module and the energy scheduling module are connected to each other.

The energy storage module stores electrical energy.

The communication module communicates with the distribution network system, and accepts the order of the distribution network system, and the order of the distribution network system includes the load condition of the power grid.

The energy dispatching module determines the source of electric energy supply for the charging pile according to the load condition of the grid, the condition of the energy storage module and the user's demand.

The output interface outputs the power provided by the grid or the grid and the energy storage module to the electric vehicle according to the power supply source determined by the energy scheduling module.

Embodiment one:

Embodiment 1 provided by the present invention is an embodiment of an electric vehicle charging pile. The structural diagram of the embodiment of the charging pile is shown in Figure 2, including a control unit, an energy storage module, a communication module, an energy scheduling module, and an output interface. , billing and metering module, card swiping module, man-machine interface module and charging process protection module, the control unit controls the connection communication module, energy dispatching module, output interface, billing and metering module, card swiping module, man-machine interface module and charging process protection module , the energy storage module and the energy scheduling module are connected to each other.

The communication module includes GPRS interface, supports TCP/IP Ethernet interface, CAN bus communication interface, PLC (Programmable Logic Controller, programmable logic controller) communication interface, Zigbee bus communication interface and 3G, 4G wireless communication interface.

The billing and metering module includes the energy billing module of the energy storage module and the charging energy billing module of the electric vehicle. The energy billing module of the energy storage module is used to bill the energy of the energy storage module when the energy storage module participates in the charging work. The electric vehicle charging energy billing module is used to charge the electric vehicle charging energy according to the energy storage module energy billing module and the power consumption of the grid.

The card swiping module is used to identify the identity of the charging user when the user starts charging, and settle the charge for the energy charged by the electric vehicle calculated by the billing and metering module after the charging is completed.

The man-machine interface module includes a display screen, which displays information such as voltage, power and current during charging, charging time, charging cost, etc. to the user.

The charging process protection module performs leakage protection and overcurrent protection for charging piles and charging electric vehicles.

The energy storage module includes charge and discharge control unit, photovoltaic power generation module, PWM (Pulse Width Modulation, pulse width modulation) module, DC/DC module A, DC/DC module B and energy storage unit, energy dispatching module and charge and discharge control unit, The energy storage unit is connected to DC/DC module A.

The energy storage module is used to use the power grid or use solar energy to store electric energy when the power grid is at a low point. into the energy storage unit for storage. The charging and discharging control unit controls the connection between the PWM module and the DC/DC module B, and the electric energy transmitted to the energy storage module at the time of the power grid's low valley is converted into DC by the PWM module, and the fixed DC voltage is converted into a variable by the DC/DC module B. The DC voltage is sent to the energy storage unit for storage.

The energy storage unit includes a power battery and a super capacitor to realize the secondary utilization of the power battery. Among them, the power battery is a power lithium battery, and the capacitance C of the supercapacitor is:

$\mathrm{<span\; class="notranslate">\; C</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; [</span><span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; I</span>}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; UI</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; \&Delta;t</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; u</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; I</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; \&Delta;I</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; \&Delta;t</span>}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; u</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; I</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>\mathrm{<span\; class="notranslate">\; \&Delta;I</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; \&Delta;t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; ]</span>}{{\mathrm{<span\; class="notranslate">\; u</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}$

为恒压阶段等分的小的时间段的份数，t为恒压阶段总时长。Among them, U ₂ is the terminal voltage of the power battery when the constant current stage changes to the constant voltage stage during the charging process, U ₁ is the starting voltage of the power battery charging, I is the current value in the constant current stage, ΔI is the step size of the current drop in the constant voltage process, t ₁ is the constant current charging time, Δt is the time corresponding to the current drop ΔI,

is the number of small time periods equally divided in the constant pressure stage, and t is the total duration of the constant pressure stage.

The capacity Q of the power lithium battery is:

Where U _2l is the voltage of the power battery on the vehicle, t is the charging time, h is the correction value of the charging time, and U _1l is the terminal voltage of the energy storage module (the voltage corresponding to the SOC of the energy storage battery being 15%).

Embodiment two:

Embodiment 2 provided by the present invention is an operation method of a charging pile provided by the present invention. The charging pile is controlled and managed by the same management platform. When the electric energy is supplied to the vehicle, when the grid load is large, the user's electric vehicle can be charged through the energy storage module. The flow chart of this operation method is shown in Figure 3, including:

In step S1, the charging pile starts charging according to the charging demand of the user's electric vehicle.

Step S2, judging whether an instruction from the distribution network system has been received, if yes, execute step S3, if no, use the electric energy of the grid to directly charge the user's electric vehicle according to the charging demand of the user's electric vehicle.

When the grid load is large, the distribution network system issues instructions to the charging piles, which include the load that the current grid can provide.

Step S3, calculate the load difference, the load difference is the difference between the charging demand of the user's electric vehicle and the load that the grid can provide, and judge whether the load difference is a positive value, if yes, go to step S4, if no, according to the user's electric vehicle The charging demand uses the electric energy of the grid to directly charge the user's electric vehicle.

Step S4, determining the discharge current of the energy storage module according to the rated power of the on-board charger and the acceptable discharge rate of the energy storage module.

Preferably, after determining the starting time point of the energy storage module as the charging power source in step S4, the flow chart of the energy storage module charging the user's electric vehicle is shown in Figure 4, including:

Step S401, when the initial time point when the energy storage module is used as the charging power source is reached, it is judged whether the SOC (state of charge, state of charge, the ratio of the remaining capacity of the battery to the capacity of the fully charged state) of the power battery of the energy storage module is If it is greater than the suggested value, if yes, go to step S402; if no, go to step S403.

Setting the SOC value of the power battery to be greater than the recommended value is to avoid deep discharge of the battery and prolong the life of the energy storage battery. Preferably, the suggested value is 15%.

Step S402, the energy storage module charges the user's charging car until the charging process ends, and continuously judges whether the SOC value of the power battery is greater than the recommended value during the charging process. Once the SOC value of the power battery is not greater than the recommended value, step S403 is executed.

Preferably, in step S402, while the energy storage module is charging the user's charging car, it is detected whether the power grid is in the peak period at this time. If it is in the peak period, stop the energy storage module from charging the user's electric vehicle, and use the power grid to charge the user's electric vehicle. Charging, if the power grid is always at peak load during the charging process, the energy storage module is used to charge the user's electric vehicle. Make the user use grid power for charging as much as possible, reduce the energy consumed during energy storage and release, and at the same time reduce the number of charging and discharging of the power battery as much as possible, and increase the battery life.

Step S403, judging whether the user's electricity demand is currently met, and if not, apply to the superior monitoring system for AC charging of the user's electric vehicle by the power grid.

Embodiment 2 of the present invention provides a charging pile operation method. If the charging demand of the user's electric vehicle is greater than the load value that the power grid can provide at this moment when the charging task is started, the user's electric vehicle is charged through the energy storage module, and calculated The starting time point when the energy storage module is used as the charging power source.

When the starting time point of the energy storage module as the charging power source is reached, if the energy storage module cannot charge the user's electric vehicle at this time, and because the load of the power grid changes in real time, it is necessary to judge whether the current power consumption of the user is reached. If necessary, if the user's electricity demand has not been met at this time, apply to the superior monitoring system for AC charging of the user's electric vehicle.

If the user's electricity demand has been met, because the current SOC value of the energy storage module is lower than the recommended value, the user's electric vehicle cannot be charged, so step S5 is also included to charge the energy storage module.

The process of charging the energy storage module in step S5 is shown in Figure 5, including:

Step S501, determine whether the photovoltaic power generation module can work, if yes, execute step S502, if no, charge the energy storage module through the grid when the grid load allows charging the energy storage module, execute step S504.

The photovoltaic power generation module is connected to the energy storage unit and the energy dispatching module, and when the external environment meets the working conditions, it can start to store energy on the energy storage unit or directly charge the user's electric vehicle.

Step S502, determine whether the grid is charging the energy storage module, and if so, stop the grid from charging the energy storage module, and execute step S503.

Step S503, start the photovoltaic power generation module to charge the energy storage module, and execute step S504.

Step S504, stop charging when the energy storage requirement of the energy storage module is met.

During the operation of the charging pile, the energy storage status of the energy storage module will also be monitored in real time, and the energy storage module will be charged when the energy storage module does not meet the energy storage requirements. Therefore, before the above step S501, it also includes:

Step S501', judge in real time whether the energy storage module meets the energy storage requirements, and execute step S501 if not.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the present invention can still be Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention shall be covered by the scope of the claims of the present invention.

Claims (12)

1. an electric automobile charging pile, it is characterized in that, described charging pile comprises control module, energy-storage module, communication module, energy scheduler module and output interface, communication module, energy scheduler module and output interface described in described control module control linkage, described energy-storage module and described energy scheduler module interconnect;

Described energy-storage module storage of electrical energy;

Described communication module is communicated by letter with distribution network system, accepts the instruction of described distribution network system, comprises network load situation in the instruction of described distribution network system;

Described energy scheduler module is determined the electric energy Source Of Supply of charging pile according to described network load situation, energy-storage module situation and user's request;

Described output interface determines that according to described energy scheduler module the power supply that electric energy Source Of Supply provides electrical network or electrical network and energy-storage module exports to user's electric automobile;

Described energy-storage module is for utilizing electrical network or utilize sun power to carry out power storage in the electrical network low ebb moment, comprise and discharge and recharge control module, photovoltaic generating module, PWM module, DC/DC modules A, DC/DC module B and energy-storage units, described energy scheduler module with described in discharge and recharge control module, energy-storage units and DC/DC modules A and be connected;

The transform light energy of the sun is become electric energy by described photovoltaic generating module, is variable DC voltage by described DC/DC modules A by fixing DC voltage conversion, sends into described energy-storage units and store;

Describedly discharge and recharge PWM module and described DC/DC module B described in control module control linkage, the electric energy that the electrical network low ebb moment sends described energy-storage module to converts alternating current to direct current through described PWM module, be variable DC voltage by described DC/DC module B by fixing DC voltage conversion, send into described energy-storage units and store.

2. charging pile as claimed in claim 1, is characterized in that, described communication module comprises GPRS interface, supports TCP/IP Ethernet interface, CAN bus communication interface, plc communication interface, Zigbee bus communication interface and 3G, 4G wireless communication interface.

3. charging pile as claimed in claim 1, is characterized in that, described charging pile comprises charging metering module and the module of swiping the card;

Described charging metering module comprises energy-storage module energy accounting module and charging electric vehicle energy accounting module;

Described energy-storage module energy accounting module for carrying out charging to described energy-storage module energy in the situation that described energy-storage module participates in charging work;

Described charging electric vehicle energy accounting module is for carrying out charging according to described energy-storage module energy accounting module and electrical network consumption electric energy to the energy of user's charging electric vehicle;

The described module of swiping the card is in the time that described user's electric automobile starts charging, the identity of described user's electric automobile being identified, and charging finishes the expense of the energy of the rear charging electric vehicle that described charging metering module is calculated and settles accounts.

4. charging pile as claimed in claim 1, is characterized in that, described charging pile comprises human-machine interface module;

Described human-machine interface module comprises display screen, and described display screen is shown charging process voltage, electric weight and electric current to user, duration of charging, the information of charging expense.

5. charging pile as claimed in claim 1, is characterized in that, described charging pile comprises charging process protection module, and described charging process protection module carries out earth leakage protection and overcurrent protection to described charging pile and described user's electric automobile.

6. charging pile as claimed in claim 1, is characterized in that, described energy-storage units comprises electrokinetic cell and super capacitor, and described electrokinetic cell is dynamic lithium battery;

The capacity Q of described dynamic lithium battery is:

Wherein, U _2lfor electrokinetic cell voltage on car, t is the duration of charging, and h is duration of charging modified value, U _1lfor energy-storage battery SOC is 15% corresponding energy-storage module terminal voltage;

The capacitance C of described super capacitor is:

$C=\frac{2[(U_2-U_1)\&times;I\&times;t_i+(\mathrm{UI}\&times;\mathrm{\&Delta;t}+U(I-\mathrm{\&Delta;I})\&times;\mathrm{\&Delta;t}+\&CenterDot;\&CenterDot;\&CenterDot;+U(I-(n-1)\mathrm{\&Delta;I})\&times;\mathrm{\&Delta;t})]}{U^2}$

Wherein, U ₂electrokinetic cell terminal voltage when constant-current phase transfers constant-voltage phase in charging process, U ₁for power battery charging starting potential, I is constant-current phase current value, and Δ I is constant voltage process electric current decline step-length, t ₁for constant-current charge duration, Δ t is the corresponding time of electric current decline Δ I,

for the umber of little time period of constant-voltage phase decile, t is the total duration of constant-voltage phase.

7. an operation method for electric automobile charging pile, is characterized in that, described charging pile comprises the charging pile as described in any one in claim 1-6, and described method comprises:

Step S1, described charging pile starts charging according to the charging demand of user's electric automobile;

Step S2, the instruction that judges whether to receive distribution network system, be, execution step S3, no, be that described user's electric automobile directly charges according to the electric energy of the charging demand utilization electrical network of described user's electric automobile;

Step S3, calculated load difference, the load that the charging demand that described load difference is described user's electric automobile and electrical network can provide poor, judge described load difference be whether on the occasion of, be, execution step S4, no, directly charge for user's electric automobile according to the electric energy of the charging demand utilization electrical network of described user's electric automobile;

Step S4, can accept direct-current discharge multiplying power and determine the discharge current of energy-storage module according to Vehicular charger rated power and energy-storage module;

After the start time point of the energy-storage module that described step S4 determines described charging pile as charge power supply, described energy-storage module comprises the process of described user's charging electric vehicle:

Step S401, judges whether the SOC value of the electrokinetic cell of described energy-storage module is greater than recommended value, is execution step S402; No, execution step S403;

Step S402, energy-storage module charges until charging process finishes to user's Rechargeable vehicle, in charging process, continues to judge whether the SOC value of electrokinetic cell is greater than recommended value, does not meet and is greater than recommended value, execution step S403 once the SOC value of electrokinetic cell;

Step S403, judges currently whether reach user power utilization needs, if do not met, superior supervisory system application charging load carries out AC charging to described user's electric automobile.

8. operation method as claimed in claim 7, is characterized in that, it is for fear of battery deep discharge that the SOC value that described electrokinetic cell is set is greater than recommended value, and described recommended value is 15%.

9. operation method as claimed in claim 7, it is characterized in that, energy-storage module described in described step S402 charges and detects described electrical network now whether in the flat peak phase simultaneously described user's Rechargeable vehicle, if in the flat peak phase, stopping described energy-storage module charges to described user's Rechargeable vehicle, adopt described electrical network to charge to described user's Rechargeable vehicle, if described electrical network, in load peak, adopts described energy-storage module to charge to described user's Rechargeable vehicle in charging process always.

10. operation method as claimed in claim 7, is characterized in that, judges that current reaching when user power utilization needs performs step S5, charges to described energy-storage module in described step S403.

11. operation methods as claimed in claim 7, is characterized in that, whether real-time judge energy-storage module reaches energy storage requirement, and while not reaching, execution step S5, charges to described energy-storage module.

12. operation methods as described in any one in claim 10 and 11, is characterized in that, described step S5 comprises:

Step S501, judges whether photovoltaic generating module can work, and is, execution step S502 is no, allow by described electrical network, described energy-storage module to be charged when described energy-storage module is charged in described network load situation, and execution step S504;

Step S502, judges whether electrical network charges to described energy-storage module, if it is stops the charging of electrical network to described energy-storage module, execution step S503;

Step S503, starts described photovoltaic generating module described energy-storage module is charged, execution step S504;

Step S504 stops charging in the time reaching energy-storage module energy storage requirement.

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