阅读说明：本技术 一种双向充电桩的充放电控制方法 (Charging and discharging control method of bidirectional charging pile ) 是由 陈欢 郭永亮 方思敏 李有明 王培慧 于 2019-04-22 设计创作，主要内容包括：本发明提供了一种双向充电桩的充放电控制方法,该控制方法包括：S1、电动汽车连接到双向充电桩的充电枪,并建立通信连接；S2、用户选择用电模式并按相应的方法进行充、放电；S3、读卡器接收计费单元的信息并更新IC卡,打印账单；S4、提示用户操作结束。本发明所述的一种双向充电桩的充放电控制方法,可实现常规充电、快速充电、预约充电及放电等不同用电需求；同时通过控制双向充电桩的充放电,实现电能在电动汽车与电网、储能装置间的多向流动；此外,通过双向充电桩进行放电,可为用户带来收益,也有利于电网调峰。(The invention provides a charge and discharge control method of a bidirectional charging pile, which comprises the following steps: s1, connecting the electric automobile to a charging gun of the bidirectional charging pile, and establishing communication connection; s2, selecting the power utilization mode by the user and charging and discharging according to the corresponding method; s3, the card reader receives the information of the charging unit, updates the IC card and prints the bill; and S4, prompting the user to finish the operation. According to the charge and discharge control method of the bidirectional charging pile, different power consumption requirements such as conventional charging, quick charging, appointed charging and discharging can be achieved; meanwhile, the charge and discharge of the bidirectional charging pile are controlled, so that the electric energy flows among the electric automobile, the power grid and the energy storage device in multiple directions; in addition, discharge through two-way charging pile, can bring the profit for the user, also be favorable to the electric wire netting peak shaver.)

1. A charge and discharge control method of a bidirectional charging pile is characterized by comprising the following steps:

s1, connecting the electric automobile to a charging gun of the bidirectional charging pile, and establishing communication connection;

s2, selecting the power utilization mode by the user and charging and discharging according to the corresponding method;

s3, the card reader receives the information of the charging unit, updates the IC card and prints the bill;

and S4, prompting the user to finish the operation.

2. The charging and discharging control method for the bidirectional charging pile according to claim 1, wherein step S1 includes:

s101, connecting the electric automobile with a charging gun; the main control unit initializes the program and judges whether to establish communication connection; if yes, go to step S102; if not, displaying 'equipment failure';

s102, the microprocessor acquires power module data of the electric automobile and feeds the data back to the main control unit;

s103, carrying out IC card swiping authentication and acquiring the IC card storage information.

3. The charging and discharging control method of the bidirectional charging pile according to claim 2, wherein the information stored in the IC card in step S103 includes owner identity information, stored value information, charging and discharging consumption record, traffic violation record, and loss of credit record.

4. The charging and discharging control method for the bidirectional charging pile according to claim 1, wherein the discharging method in step S2 is as follows:

s211, judging whether the power module data are matched with the database information, if so, performing a step S212, and if not, stopping discharging;

s212, detecting the operation environment of the power grid unit, and judging whether the power grid unit is in a power utilization peak period; if not, the process goes to step S213 to discharge to the energy storage device; if yes, go to step S214 to discharge to the grid unit;

s213, judging whether the input power of the energy storage device is larger than the total discharge power of the electric automobile, and if so, starting discharging; if not, performing step S214 to discharge to the power grid unit;

s214, judging whether the rated power of a current transformer in the bidirectional charging pile is larger than the total discharge power of the connected electric automobile or not, and if so, starting discharging; if not, the discharging is finished.

5. The charging and discharging control method for the bidirectional charging pile according to claim 4, wherein the step S214 further comprises: when the rated power of a converter in the bidirectional charging pile meets the discharging requirement, whether the rated power of an inverter in the power grid unit is larger than the total discharging power of the electric automobile in the system or not is continuously judged, if yes, discharging is started, and if not, discharging is finished.

6. The charging and discharging control method for the bidirectional charging pile according to claim 1, wherein the charging method in step S2 is as follows:

s201, according to the requirement, a user selects a charging mode and feeds the charging mode back to the main control unit; the main control unit judges whether the charging is conventional according to the received instruction; if yes, go to step S202; if not, go to step S205;

s202, detecting current and harmonic real-time data output by a power grid unit by a detection device;

s203, judging whether the electric energy of the power grid unit meets the charging requirement; if so, charging by using the electric energy of the power grid unit according to the real-time electricity price; if not, go to step S204;

s204, performing voltage and current real-time compensation through the compensation unit to enable the electric energy output by the power grid unit to meet the charging requirement, and returning to S203;

s205: the main control unit judges whether the quick charging is carried out or not, if so, the residual output power of the energy storage device is calculated, namely the difference value of the rated output power of the energy storage device and the sum of all the current quick charging powers is calculated; judging whether the residual output power of the energy storage device meets the charging requirement or not; if so, charging by using the electric energy of the energy storage device; if not, go to step S206;

s206: inputting the reserved charging time through an input-output module;

s207, calculating the residual output power of the transformer in the power grid unit within the reserved time, namely the difference value between the rated power of the transformer and the total charging power of the energy storage device and the electric automobile within the reserved time;

s208, judging whether the residual output power of the transformer meets the charging requirement within the reserved time; if yes, go to step S209; if not, stopping charging energy storage through the energy storage device or performing discharging energy supply by using the energy storage device to perform power compensation on a transformer of the power grid unit;

s209, the main control unit calculates the residual output power of the bidirectional charging pile in the reserved time, namely the difference between the rated power of the bidirectional charging pile and the sum of the charging power of the electric automobile in the reserved time;

s210, judging whether the residual output power of the bidirectional charging pile meets the charging requirement within the reserved time; if yes, the reservation is successful, and the steps S202 to S204 are carried out within the reserved time; if not, the charging is finished.

7. The charging and discharging control method of the bidirectional charging pile according to claim 6, wherein the charging power requirement in step S203 is as follows: when the voltage deviation of the 380V power grid unit is +/-7% of the nominal voltage, the voltage total harmonic distortion rate of the nominal voltage 380V is less than or equal to 5%, the odd harmonic voltage content rate is less than or equal to 4%, and the even harmonic voltage content rate is less than or equal to 2%.

8. The charging and discharging control method for the bidirectional charging pile according to claim 1, wherein step S3 includes:

s301, judging whether charging and discharging reach a user set value, if so, finishing charging and discharging, and entering a step S302; if not, displaying the current electric quantity of the battery, and continuously charging and discharging;

s302, the main control unit stops charging and discharging and sends charging and discharging information and the residual amount to a display screen; the card reader receives user update information sent by the main control unit and writes the update information into the IC card;

and S303, printing a bill, and finishing consumption.

9. A charge and discharge control method of a bidirectional charging pile is characterized by comprising the following steps:

s01, connecting the electric automobile with the charging gun,

s02, the main control unit initializes the program and judges whether to establish communication connection; if yes, acquiring power module data of the electric automobile through the microprocessor and feeding the data back to the main control unit; if not, displaying 'equipment failure';

s03, performing IC card swiping authentication, and acquiring IC card storage information including vehicle owner identity information, stored value information and charging and discharging consumption records;

s04, according to the requirement, the user selects the charging mode or the discharging mode and feeds back the charging mode or the discharging mode to the main control unit;

(1) if the charging mode is adopted, the main control unit judges whether the charging mode is a conventional charging mode or not according to the received instruction; if yes, go to step S041; if not, the step S042 is carried out;

s041, detecting current and harmonic real-time data output by the power grid unit by a detection device; judging whether the electric energy of the power grid unit meets the charging requirement or not; if so, charging by using the electric energy of the power grid unit according to the real-time electricity price; if not, the voltage and current are compensated in real time through the compensation unit, so that the electric energy output by the power grid unit meets the charging requirement;

s042: the main control unit judges whether the electric vehicle is charged quickly or not, if so, the residual output power of the energy storage device is calculated, namely the difference value between the rated output power of the energy storage device and the total power of all the electric vehicles which are charged quickly at present; judging whether the residual output power of the energy storage device meets the charging requirement or not; if so, charging by using the electric energy of the energy storage device; if not, go to step S043;

s043: inputting the reserved charging time through an input-output module; calculating the residual output power of the power grid unit transformer in the reserved time, namely the difference value between the rated power of the transformer and the total charging power of the energy storage device and the electric automobile in the reserved time; judging whether the residual output power of the transformer of the power grid unit meets the charging requirement within the reserved time; if yes, the step S044 is carried out; if not, stopping charging energy storage through the energy storage device or performing discharging energy supply by using the energy storage device to perform power compensation on a transformer of the power grid unit;

s044, the main control unit calculates the residual output power of the bidirectional charging pile in the reserved time, namely the difference value between the rated power of the bidirectional charging pile and the total charging power of the electric automobile in the reserved time;

s045, judging whether the residual output power of the bidirectional charging pile meets the charging requirement within the reserved time; if yes, the reservation is successful, and the step S041 is carried out within the reservation time; if not, ending the charging;

(2) if the discharge mode is adopted, judging whether the power module data is matched with the database information, if so, performing step S046, and if not, stopping discharging;

s046, detecting the operation environment of the power grid unit, and judging whether the power grid unit is in a power utilization peak period; if not, the step S047 is carried out to discharge to the energy storage device; if yes, the step S048 is carried out to discharge to the power grid unit;

s047, judging whether the input power of the energy storage device is larger than the total discharge power of the electric automobile, and if so, starting discharging; if not, performing step S048 to discharge to the power grid unit;

s048, judging whether the output power of the converter is greater than the total discharge power of the electric automobile connected with the bidirectional charging pile and the rated power of the inverter is greater than the total discharge power of the electric automobile in the system, and if so, starting discharging; if not, ending the discharge;

s05, judging whether the charging or discharging reaches the set value of the user, if yes, finishing the charging and discharging, stopping the charging and discharging by the main control unit, sending the charging and discharging information and the residual amount of money to the display screen, receiving the user updating information sent by the main control unit by the card reader, writing the updating information into the IC card, printing the bill, and finishing the use; if not, the current electric quantity of the battery is displayed, and charging and discharging are continued.

Technical Field

The invention relates to the technical field of charge and discharge control, in particular to a charge and discharge control method of a bidirectional charging pile.

Background

Along with the continuous deepening of the global energy crisis, the gradual depletion of petroleum resources, the aggravation of the harm of atmospheric pollution and global temperature rise, energy conservation and emission reduction are the main attack directions of the future automobile technology development. The electric automobile as a new generation of transportation has incomparable advantages compared with the traditional automobile in the aspects of saving energy, reducing emission and reducing the dependence of human on traditional fossil energy. Electric automobile need use simultaneously to fill electric pile and charge to guarantee electric automobile used repeatedly, reach the purpose of "replacing oil with the electricity", consequently fill electric pile and have irreplaceable effect to electric automobile's using widely.

The data shows that the new energy automobile yield and sales in China have a leap growth since 2014, and the yield and sales respectively grow from 7.9 ten thousand and 7.5 ten thousand in the year to 51.7 ten thousand and 50.7 ten thousand in 2016. Meanwhile, the existing cogeneration unit for generating electricity runs in a mode of 'fixing the power by heat', and the peak regulation capacity is only about 10%. The difficulty of peak shaving is becoming the most prominent problem in the operation of the power grid.

The number of electric vehicles in China is estimated to reach 6000 million by 2030, on one hand, a large number of electric vehicles are connected into a power grid, so that the load is increased, the load peak-valley difference of the power grid is increased, the peak regulation difficulty of the power grid is increased, the load of a power system is increased, and the safety and the reliability of the power grid are seriously influenced. On the other hand, the battery capacity of an electric vehicle is typically between 15-60kwh, which is a huge energy storage capacity calculated as 15 kw. Through control, realize the two-way flow between electric automobile and the stake of charging, then can effectively reduce the electric wire netting peak valley difference, reduce the peak regulation degree of difficulty.

Disclosure of Invention

In order to solve the problems, the invention provides a charge and discharge control method of a bidirectional charging pile, which can realize multidirectional flow of electric energy among an electric automobile, a power grid unit and an energy storage device and improve the use safety of the bidirectional charging pile; meanwhile, various requirements of consumers on charging and discharging are met, and peak load regulation pressure of a power grid can be effectively relieved.

The technical scheme of the invention is realized as follows:

a charging and discharging control method of a bidirectional charging pile comprises the following steps:

s1, connecting the electric automobile to the charging gun, and establishing communication connection;

s2, selecting the power utilization mode by the user and charging and discharging according to the corresponding method;

s3, the card reader receives the information of the charging unit, updates the IC card and prints the bill;

and S4, prompting the user to finish the operation.

Further, step S1 includes:

s101, connecting the electric automobile with a charging gun; the main control unit initializes the program and judges whether to establish communication connection; if yes, go to step S102; if not, displaying 'equipment failure';

s102, the microprocessor acquires power module data of the electric automobile and feeds the data back to the main control unit;

s103, carrying out IC card swiping authentication and acquiring the IC card storage information.

Further, the IC card storage information in step S103 includes owner identity information, stored value information, charge and discharge consumption record, traffic violation record, and loss of credit record.

Further, the discharging method in step S2 is:

s211, judging whether the power module data are matched with the database information, if so, performing a step S212, and if not, stopping discharging;

s212, detecting the operation environment of the power grid unit, and judging whether the power grid unit is in a power utilization peak period; if not, the process goes to step S213 to discharge to the energy storage device; if yes, go to step S214 to discharge to the grid unit;

s213, judging whether the input power of the energy storage device is larger than the total discharge power of the electric automobile, and if so, starting discharging; if not, performing step S214 to discharge to the power grid unit;

s214, judging whether the rated power of a current transformer in the bidirectional charging pile is larger than the total discharge power of the connected electric automobile or not, and if so, starting discharging; if not, the discharging is finished.

Further, the step S214 further includes: when the rated power of a converter in the bidirectional charging pile meets the discharging requirement, whether the rated power of an inverter in the power grid unit is larger than the total discharging power of the electric automobile in the system or not is continuously judged, if yes, discharging is started, and if not, discharging is finished.

Further, the charging method in step S2 is:

s201, according to the requirement, a user selects a charging mode and feeds the charging mode back to the main control unit; the main control unit judges whether the charging is conventional according to the received instruction; if yes, go to step S202; if not, go to step S205;

s202, detecting current and harmonic real-time data output by a power grid unit by a detection device;

s203, judging whether the electric energy of the power grid unit meets the charging requirement; if so, charging by using the electric energy of the power grid unit according to the real-time electricity price; if not, go to step S204;

s204, performing voltage and current real-time compensation through the compensation unit to enable the electric energy output by the power grid unit to meet the charging requirement, and returning to S203;

s205: the main control unit judges whether the quick charging is carried out or not, if so, the residual output power of the energy storage device is calculated, namely the difference value of the rated output power of the energy storage device and the sum of all the current quick charging powers is calculated; judging whether the residual output power of the energy storage device meets the charging requirement or not; if so, charging by using the electric energy of the energy storage device; if not, go to step S206;

s206: inputting the reserved charging time through an input-output module;

s207, calculating the residual output power of the transformer in the power grid unit within the reserved time, namely the difference value between the rated power of the transformer and the total charging power of the energy storage device and the electric automobile within the reserved time;

s208, judging whether the residual output power of the transformer meets the charging requirement within the reserved time; if yes, go to step S209; if not, stopping charging energy storage through the energy storage device or performing discharging energy supply by using the energy storage device to perform power compensation on a transformer of the power grid unit;

s209, the main control unit calculates the residual output power of the bidirectional charging pile in the reserved time, namely the difference between the rated power of the bidirectional charging pile and the sum of the charging power of the electric automobile in the reserved time;

s210, judging whether the residual output power of the bidirectional charging pile meets the charging requirement within the reserved time; if yes, the reservation is successful, and the steps S202 to S204 are carried out within the reserved time; if not, the charging is finished.

Further, the charging power requirement in step S203 is: when the voltage deviation of the 380V power grid unit is +/-7% of the nominal voltage, the voltage total harmonic distortion rate of the nominal voltage 380V is less than or equal to 5%, the odd harmonic voltage content rate is less than or equal to 4%, and the even harmonic voltage content rate is less than or equal to 2%.

Further, step S3 includes:

s301, judging whether charging and discharging reach a user set value, if so, finishing charging and discharging, and entering a step S302; if not, displaying the current electric quantity of the battery, and continuously charging and discharging;

s302, the main control unit stops charging and discharging and sends charging and discharging information and the residual amount to a display screen; the card reader receives user update information sent by the main control unit and writes the update information into the IC card;

and S303, printing a bill, and finishing consumption.

A charging and discharging control method of a bidirectional charging pile comprises the following steps:

s01, connecting the electric automobile with the charging gun,

s02, the main control unit initializes the program and judges whether to establish communication connection; if yes, acquiring power module data of the electric automobile through the microprocessor and feeding the data back to the main control unit; if not, displaying 'equipment failure';

s03, performing IC card swiping authentication, and acquiring IC card storage information including vehicle owner identity information, stored value information and charging and discharging consumption records;

and S04, selecting a charging mode or a discharging mode by the user according to the requirement and feeding back to the main control unit.

(1) If the charging mode is adopted, the main control unit judges whether the charging mode is a conventional charging mode or not according to the received instruction; if yes, go to step S041; if not, the step S044 is carried out;

s041, detecting current and harmonic real-time data output by the power grid unit by a detection device; judging whether the electric energy of the power grid unit meets the charging requirement or not; if so, charging by using the electric energy of the power grid unit according to the real-time electricity price; if not, the voltage and current are compensated in real time through the compensation unit, so that the electric energy output by the power grid unit meets the charging requirement;

s042: the main control unit judges whether the electric vehicle is charged quickly or not, if so, the residual output power of the energy storage device is calculated, namely the difference value between the rated output power of the energy storage device and the total power of all the electric vehicles which are charged quickly at present; judging whether the residual output power of the energy storage device meets the charging requirement or not; if so, charging by using the electric energy of the energy storage device; if not, go to step S043;

s043: inputting the reserved charging time through an input-output module; calculating the residual output power of the power grid unit transformer in the reserved time, namely the difference value between the rated power of the transformer and the total charging power of the energy storage device and the electric automobile in the reserved time; judging whether the residual output power of the transformer of the power grid unit meets the charging requirement within the reserved time; if yes, the step S044 is carried out; if not, stopping charging energy storage through the energy storage device or performing discharging energy supply by using the energy storage device to perform power compensation on a transformer of the power grid unit;

s044, the main control unit calculates the residual output power of the bidirectional charging pile in the reserved time, namely the difference value between the rated power of the bidirectional charging pile and the total charging power of the electric automobile in the reserved time;

s045, judging whether the residual output power of the bidirectional charging pile meets the charging requirement within the reserved time; if yes, the reservation is successful, and the step S041 is carried out within the reservation time; if not, the charging is finished.

(2) If the discharge mode is adopted, judging whether the power module data is matched with the database information, if so, performing step S046, and if not, stopping discharging;

s046, detecting the operation environment of the power grid unit by using a detection device, and judging whether the power grid unit is in a power utilization peak period; if not, the step S047 is carried out to discharge to the energy storage device; if yes, the step S048 is carried out to discharge to the power grid unit;

s047, judging whether the input power of the energy storage device is larger than the total discharge power of the electric automobile, and if so, starting discharging; if not, performing step S048 to discharge to the power grid unit;

s048, judging whether the output power of the converter is greater than the total discharge power of the electric automobile connected with the bidirectional charging pile and the rated power of the inverter is greater than the total discharge power of the electric automobile in the system, and if so, starting discharging; if not, the discharging is finished.

S05, judging whether the charging or discharging reaches the set value of the user, if yes, finishing the charging and discharging, stopping the charging and discharging by the main control unit, sending the charging and discharging information and the residual amount of money to the display screen, receiving the user updating information sent by the main control unit by the card reader, writing the updating information into the IC card, printing the bill, and finishing the use; if not, the current electric quantity of the battery is displayed, and charging and discharging are continued.

Compared with the prior art, the charging control method of the bidirectional charging pile has the following advantages:

(1) the charge-discharge control method can carry out quick charge, appointed charge, conventional charge and discharge, and meet different consumption requirements;

(2) the charge and discharge control method disclosed by the invention selectively discharges to the power grid or the energy storage device by judging whether the power consumption peak is the power consumption peak, so that the user income and participation degree are improved; the electric energy can flow in multiple directions among the electric automobile, the power grid unit and the energy storage device through charging and discharging, and the electric automobile is beneficial to participating in power grid peak shaving;

(3) the charge and discharge control method ensures the use safety of the bidirectional charging pile by judging for many times in the charge and discharge process;

drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural diagram of a charging pile system according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a bidirectional charging pile according to an embodiment of the present invention;

fig. 3 is a flowchart of a charging and discharging control method for a bidirectional charging pile according to an embodiment of the present invention;

fig. 4 is a schematic flowchart of a discharge control method of a bidirectional charging pile according to an embodiment of the present invention;

fig. 5 is a schematic flow chart of a charge and discharge control method for a bidirectional charging pile according to an embodiment of the present invention;

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.