Alternating current charging pile communication regulation and control device and regulation and control method

Abstract

The invention relates to the technical field of power regulation and control, in particular to an alternating current charging pile communication regulation and control device and method, and the device comprises a charging pile simulation loop, an MCU control module, a vehicle-mounted charging simulation loop, a sampling circuit and a communication module. Based on the charging pile simulation loop and the vehicle-mounted charging simulation loop, handshake connection with the alternating current charging pile and the vehicle-mounted charging end is carried out; the maximum charging power of the alternating current charging pile is obtained through the communication module; determining a current given value according to the maximum charging power to obtain a duty ratio given signal, and converting the duty ratio given signal into a PWM analog signal; according to the determined duty ratio of the PWM analog signal, determining a charging current matched with the duty ratio in a mapping manner; and updating the PWM analog signal, and adjusting the charging current until the alternating current charging pile stops charging. By directly controlling the output power of the AC charging pile, the charging load can be equally distributed in different periods and regions, and the utilization rate of the power grid and the power supply reliability are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power control, and in particular to an AC charging pile communication control device and a control method. Background Art

[0002] With the rapid growth of electric vehicles, the supporting charging facilities for electric vehicles are also connected to the public power grid on a large scale, which has a strong impact on the distribution network. In addition, the charging load of electric vehicles was not considered in the early stage of construction of traditional distribution transformers and line cables, making it difficult to meet the growing demand for electric vehicle charging. The working hours of charging piles are highly overlapped with the peak load time, which can easily cause heavy overload tripping and affect the normal power supply to residents. Therefore, it is necessary to realize the operation regulation and management of charging piles to ensure the stable operation of the power supply of the distribution network.

[0003] According to the survey, high-power DC charging piles have been networked and controlled through the Internet of Vehicles platform or TCU control device, but AC charging piles do not have any communication interface, and the charging mechanism of AC charging piles can only support full power operation or stop working under actual working conditions, and cannot actively adjust the charging power of the charging piles. The charging time of the large number of distributed AC charging piles is concentrated, and the remaining open capacity in the low-voltage area is insufficient, which is easy to cause load shock to the public transformer area.

[0004] The existing Chinese patent publication number CN117416229A discloses an orderly charging management device and method for an electric vehicle AC charging pile. Although the disordered charging pile and the on-board charging terminal are respectively connected through a back-end orderly charging control device, the CP connection method of the back-end orderly charging control device is the same as the original CP direct connection method. It only receives the charging queue sequence of the cloud management scheduling platform, thereby controlling the back-end orderly charging control device to realize the orderly sequential charging of the charging pile, and still charges the car through the PWM duty cycle output by the AC charging pile, and cannot actively perform PWM duty cycle signal regulation. Summary of the invention

[0005] In order to solve the above problems, the present invention provides an AC charging pile communication control device, which is arranged between the AC charging pile and the vehicle charging terminal. The device includes a charging pile simulation circuit, an MCU control module, an on-board charging simulation circuit, a sampling circuit and a communication module; the charging pile simulation circuit and the on-board charging simulation circuit are respectively connected to the MCU control module via the sampling circuit, and the MCU control module is electrically connected to the communication module; The charging pile simulation circuit is used to connect the AC charging pile to transmit the analog signal, simulate the connection between the AC charging pile and the vehicle charging terminal, so that the AC charging pile can handshake with the vehicle charging terminal according to the analog signal judgment of the AC charging pile communication control device, trigger the AC charging pile to switch to the PWM connection state, and perform power supply work; The on-board charging simulation circuit is used to detect the connection feedback signal of the on-board charging terminal, and generate an AC charging pile simulation signal to connect to the on-board charging terminal, so that the on-board charging terminal can handshake with the AC charging pile according to the simulation signal of the AC charging pile communication control device, triggering the on-board charging pile to switch to the charging state; and receive the PWM output signal of the MCU control module and transmit it to the on-board charging pile to adjust the maximum charging power.

[0006] The sampling circuit is used to detect the loop voltage signals of the charging pile simulation loop and the vehicle charging simulation loop respectively, and transmit them to the MCU control module; The MCU control module is used to receive the loop voltage signal of the sampling circuit, determine the connection status of the charging pile simulation circuit and the vehicle charging simulation circuit, and switch the DC or PWM output mode; and receive the maximum charging power signal of the communication module, calculate the PWM output signal duty cycle based on the maximum charging power signal, and transmit it to the vehicle charging simulation circuit; The communication module is used to upload the startup and operation status of the AC charging pile, receive the maximum charging power signal of the AC charging pile sent by the station area, and transmit it to the MCU control module.

[0007] As a specific implementation method, the AC charging pile communication control device is connected to the AC charging pile and the vehicle charging terminal through a charging CP line.

[0008] The charging pile simulation circuit is connected to the power supply control circuit of the AC charging pile, and the vehicle-mounted charging simulation circuit is electrically connected to the vehicle-mounted charging terminal.

[0009] Among them, the charging pile simulation circuit includes a fourth resistor R4, a fifth resistor R5 and a third switch S3. The third switch S3 is connected in series with the fifth resistor R5 and then connected in parallel with the fourth resistor R4. One end of the fourth resistor R4 is connected to the power supply control circuit, and the other end thereof is grounded.

[0010] The vehicle charging simulation circuit includes a fourth switch S4 and a sixth resistor R6, one end of the fourth switch is connected in series with the sixth resistor R6, and the other end is connected to the DC output end or the PWM output end of the MCU control module; the sixth resistor R6 is connected to the vehicle charging end via the charging CP line.

[0011] The AC charging pile communication control device sets a first detection point at the connection point between the power supply control circuit R1 and the charging pile simulation circuit; sets a second detection point at the parallel node of the charging pile simulation circuit R4 and R5; sets a third detection point at the series node of the charging control module diode D1 and R3; and sets a fourth detection point at the connection point between the on-board charging simulation circuit R6 and the charging CP line.

[0012] The MCU control module is also used to receive detection signals from the first detection point, the second detection point, the third detection point and the fourth detection point, and control the switching and closing of the charging pile simulation circuit and the vehicle charging simulation circuit according to the detection signals from the first detection point and the third detection point; and adjust the simulation state of the charging pile simulation circuit and the vehicle charging simulation circuit based on the second detection point and the fourth detection point.

[0013] Another aspect of the present invention further provides an AC charging pile communication control method, which is applied to the AC charging pile communication control device as described above, and the method specifically comprises the following steps: Step 1: Based on the charging pile simulation circuit and the vehicle charging simulation circuit, handshake connections are made with the AC charging pile and the vehicle charging terminal respectively; Step 2: Start the power supply action based on the AC charging pile, and obtain the maximum charging power of the AC charging pile through the communication module; Step 3: The MCU control module obtains the power supply voltage signal of the AC charging pile, determines the current given value according to the maximum charging power, obtains the duty cycle given signal based on the current given value, and converts the duty cycle given signal into a PWM analog signal; Step 4: According to the determined duty cycle of the PWM analog signal, the on-board charging terminal determines the actual charging current that matches the duty cycle mapping; Step 5: Obtain the maximum charging power of the AC charging pile issued by the station in real time, update the PWM analog signal, and adjust the actual charging current until the AC charging pile stops charging.

[0014] In a specific implementation, the charging current matching the duty cycle mapping is determined according to the determined duty cycle of the PWM analog signal, specifically: When the duty cycle D of the PWM analog signal is less than 8% or greater than 97%, the actual charging current is zero and charging is not allowed; When the duty cycle D of the PWM analog signal is greater than or equal to 8% and less than 10%, the actual maximum charging current Imax is 6A; When the duty cycle D of the PWM analog signal is greater than or equal to 10% and less than 85%, the actual maximum charging current Imax=(D*100)*0.6; When the duty cycle D of the PWM analog signal is greater than or equal to 85% and less than or equal to 97%, the actual charging current Imax = (D*100-64)*2.5 and is less than or equal to 63A.

[0015] Beneficial effects: The present invention is a communication control device and control method for an AC charging pile. By directly controlling the output power of the AC charging pile, the charging load can be evenly distributed in different time periods and regions, avoiding problems such as sudden increase in charging load and overload of the power grid, thereby greatly improving the utilization rate of the power grid and the reliability of power supply.

[0016] Optimize the charging process: By simulating the handshake connection between the AC charging pile and the on-board charging terminal, it is ensured that the AC charging pile can correctly switch to the PWM connection state and perform power supply work. At the same time, the on-board charging terminal can switch to the charging state according to the analog signal, thereby optimizing the entire charging process.

[0017] Dynamically adjust charging power: The device can dynamically adjust the duty cycle of the PWM output signal according to the maximum charging power signal sent by the substation, and then adjust the maximum charging power of the on-board charging terminal to meet the remaining open capacity of the low-voltage substation, thereby realizing dynamic regulation of the charging load.

[0018] Improve charging efficiency: By obtaining the maximum charging power of the AC charging pile issued by the station in real time and updating the PWM analog signal duty cycle, the charging current can be adjusted in real time to ensure the efficiency and safety of the charging process.

[0019] Simplify the upgrade of charging equipment: Since the control device can be connected between the existing AC charging pile and the on-board charging terminal, there is no need for large-scale hardware upgrades of existing equipment, which simplifies the upgrade process of charging equipment.

[0020] Improve the stability of the power grid: Through the use of control devices, the instability of the power grid caused by excessive charging load can be effectively avoided, which helps to improve the stability and reliability of the entire power grid.

[0021] Easy to manage and monitor: The communication module can receive instructions and information issued by the station area, which facilitates the management and monitoring of the charging process and improves the management efficiency of the charging station. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is the circuit diagram of the AC charging pile communication control device. DETAILED DESCRIPTION

[0023] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings.

[0024] See also Figure 1 This embodiment provides an AC charging pile communication control device, which is arranged between the AC charging pile and the vehicle charging terminal. The AC charging pile communication control device includes a charging pile simulation circuit, an MCU control module, an on-board charging simulation circuit, a sampling circuit and a communication module; the charging pile simulation circuit and the on-board charging simulation circuit are respectively connected to the MCU control module via the sampling circuit, and the MCU control module is electrically connected to the communication module.

[0025] The charging pile simulation circuit is used to connect the AC charging pile to transmit the analog signal, simulate the connection between the AC charging pile and the vehicle charging terminal, so that the AC charging pile can handshake with the vehicle charging terminal according to the analog signal judgment of the AC charging pile communication control device, trigger the AC charging pile to switch to the PWM connection state, and perform power supply work; The on-board charging simulation circuit is used to detect the connection feedback signal of the on-board charging terminal, and generate an AC charging pile simulation signal to connect to the on-board charging terminal, so that the on-board charging terminal can handshake with the AC charging pile according to the simulation signal of the AC charging pile communication control device, triggering the on-board charging pile to switch to the charging state; and receive the PWM output signal of the MCU control module and transmit it to the on-board charging pile to adjust the maximum charging power.

[0026] The sampling circuit is used to detect the loop voltage signals of the charging pile simulation loop and the vehicle charging simulation loop respectively, and transmit them to the MCU control module; The MCU control module is used to receive the loop voltage signal of the sampling circuit, determine the connection status of the charging pile simulation circuit and the vehicle charging simulation circuit, and switch the DC or PWM output mode; and receive the maximum charging power signal of the communication module, calculate the PWM output signal duty cycle based on the maximum charging power signal, and transmit it to the vehicle charging simulation circuit; The communication module is used to upload the startup and operation status of the AC charging pile, receive the maximum charging power signal of the AC charging pile sent by the station area, and transmit it to the MCU control module.

[0027] In actual applications, the AC charging pile is connected to the on-board charging end through a charging gun line, wherein the charging output end of the AC charging pile is connected to the charging input end of the on-board charging end through a charging phase line; the power supply control circuit of the AC charging pile is connected to the charging control module of the on-board charging end through a charging CP line.

[0028] The power supply control circuit of the AC charging pile includes a DC voltage output port, a PWM output port, a first switch S1 and a first resistor R1. The DC voltage output port and the PWM output port are connected in series with one end of the first resistor R1 via the first switch S1.

[0029] The charging control module of the vehicle charging terminal includes a second switch S2, a second resistor R2, a third resistor R3 and a diode D1. One end of the diode D1 is connected in series with the third resistor R3 and grounded. The second switch S2 is connected in series with the second resistor R2 and then connected in parallel with the third resistor R3.

[0030] In order to achieve charging load control of the AC charging pile and meet the remaining open capacity of the low-voltage area. The innovation of this application is to disconnect the original charging CP line, and connect the AC charging pile communication control device to the power supply control circuit of the AC charging pile and the charging CP line, that is, the input end of the AC charging pile communication control device is connected to the AC charging pile, and its output end is connected to the vehicle charging end through the CP line. Thus, the charging pile simulation circuit is connected to the power supply control circuit of the AC charging pile, and the vehicle charging simulation circuit is electrically connected to the vehicle charging end.

[0031] The charging pile simulation circuit includes a fourth resistor R4, a fifth resistor R5 and a third switch S3. The third switch S3 is connected in series with the fifth resistor R5 and then connected in parallel with the fourth resistor R4. One end of the fourth resistor R4 is connected to the power supply control circuit, and the other end thereof is grounded.

[0032] The vehicle charging simulation circuit includes a fourth switch S4 and a sixth resistor R6, one end of the fourth switch is connected in series with the sixth resistor R6, and the other end is connected to the DC output end or the PWM output end of the MCU control module; the sixth resistor R6 is connected to the vehicle charging end via the charging CP line.

[0033] The AC charging pile communication control device sets a first detection point at the connection point between the power supply control circuit R1 and the charging pile simulation circuit; sets a second detection point at the parallel node of the charging pile simulation circuit R4 and R5; sets a third detection point at the series node of the charging control module diode D1 and R3; and sets a fourth detection point at the connection point between the on-board charging simulation circuit R6 and the charging CP line.

[0034] The MCU control module is used to receive detection signals from the first detection point, the second detection point, the third detection point and the fourth detection point, and control the switching and closing of the third switch S3 and the fourth switch S4 according to the detection signals from the first detection point and the third detection point; and adjust the simulation state of the charging pile simulation circuit and the vehicle-mounted charging simulation circuit based on the second detection point and the fourth detection point.

[0035] In a specific implementation, when the AC charging pile is connected to the on-board charging terminal through the charging gun line, the charging control module of the on-board charging terminal performs CP detection. At this time, the first switch S1 of the power supply control circuit of the AC charging pile initially closes the DC voltage output port, and the DC voltage output port is connected in series with the first resistor R1 to output a DC 12V voltage to the charging simulation circuit (the fourth resistor R4 is connected in parallel with the fifth resistor R5, and the third switch S3 is in the open state). The voltage value of the first detection point is reduced to 9V, and the AC charging pile is simulated by the charging pile simulation circuit to achieve a connection handshake with the on-board charging terminal. The MCU control module receives the detection signal of the first detection point, and similarly controls the fourth switch S4 to close and turn on the DC output terminal, and the DC output terminal is connected in series with the sixth resistor R6 and the third resistor R3, so that the on-board charging simulation circuit simulates the AC charging pile and the on-board charging terminal to achieve a connection handshake.

[0036] When the power supply control circuit of the AC charging pile detects and realizes the connection handshake, the first switch S1 is switched to close and turn on the PWM output port of the power supply control circuit, and the PWM output port transmits the PWM signal to the communication control device of the AC charging pile. After the second detection point of the charging pile simulation circuit detects the PWM signal, the MCU control module controls the fourth switch S4 to close and turn on the PWM output end, and the charging control module of the vehicle charging end detects the PWM analog signal transmitted by the vehicle charging simulation circuit. The second switch S2 is closed and turned on, R2 and R3 are connected in parallel, so that the voltage of the PWM analog signal transmitted by the vehicle charging simulation circuit is reduced; after the fourth detection point detects the voltage reduction, the MCU control module controls the third switch S3 to close and turn on, R4 and R5 are connected in parallel, so that the voltage of the PWM signal transmitted by the power supply control circuit of the AC charging pile is reduced, and the AC charging pile is successfully received by the PWM signal simulated by the charging pile simulation circuit, and the AC charging pile closes the internal main relay and turns on its charging output end for power supply. Based on this, the AC charging pile does not control the vehicle charging end to perform AC charging with the PWM signal generated by itself, but is received and intercepted by the charging pile simulation circuit of the communication control device of the AC charging pile. The vehicle-mounted charging terminal actually determines the maximum charging power according to the duty cycle of the PWM analog signal output by the MCU control module.

[0037] Based on the AC charging pile communication control device provided in the above embodiment, an AC charging pile communication control method is also provided, and the specific steps of the method are as follows: Step 1: Based on the charging pile simulation circuit and the vehicle charging simulation circuit, handshake connections are made with the AC charging pile and the vehicle charging terminal respectively; Step 2: Start the power supply action based on the AC charging pile, and obtain the maximum charging power of the AC charging pile through the communication module; When the AC charging pile starts the power supply, it means that the AC charging pile and the on-board charging terminal have completed the charging gun line connection, and the CP detection of the on-board charging terminal is completed, waiting to receive the PWM signal duty cycle for charging.

[0038] The communication module is used to connect to the area terminal, which stores the maximum open capacity of the area. The communication modules of different AC charging piles are used to obtain the number of AC charging piles currently in operation, and the maximum charging power of the newly started AC charging pile is calculated and determined. The formula is: Maximum charging power W = maximum available capacity of the area Q / number of AC charging piles N.

[0039] Step 3: The MCU control module obtains the power supply voltage signal of the AC charging pile, determines the current given value according to the maximum charging power, obtains the duty cycle given signal based on the current given value, and converts the duty cycle given signal into a PWM analog signal; The MCU control module obtains the maximum charging power W through the communication module, and obtains the power supply voltage signal U of the AC charging pile through the sampling circuit, and calculates the current given value according to the maximum charging power W and the power supply voltage signal U I Q , I Q =maximum charging power W / supply voltage signal U.

[0040] The MCU control module obtains a duty cycle given signal according to a current given value, and converts the duty cycle given signal into a PWM analog signal.

[0041] Step 4: According to the determined duty cycle of the PWM analog signal, the on-board charging terminal determines the actual charging current that matches the duty cycle mapping; When the duty cycle D of the PWM analog signal is less than 8% or greater than 97%, the actual charging current is zero and charging is not allowed; When the duty cycle D of the PWM analog signal is greater than or equal to 8% and less than 10%, the actual maximum charging current Imax is 6A; When the duty cycle D of the PWM analog signal is greater than or equal to 10% and less than 85%, the actual maximum charging current Imax=(D*100)*0.6; When the duty cycle D of the PWM analog signal is greater than or equal to 85% and less than or equal to 97%, the actual charging current Imax = (D*100-64)*2.5 and is less than or equal to 63A.

[0042] Step 5: Obtain the maximum charging power of the AC charging pile issued by the station in real time, update the PWM analog signal, and adjust the actual charging current until the AC charging pile stops charging.

Claims

1. An AC charging pile communication control device, arranged between the AC charging pile and the vehicle charging terminal, characterized in that: The device comprises a charging pile simulation circuit, an MCU control module, an on-board charging simulation circuit, a sampling circuit and a communication module; the charging pile simulation circuit and the on-board charging simulation circuit are respectively connected to the MCU control module via the sampling circuit, and the MCU control module is electrically connected to the communication module; The charging pile simulation circuit is used to connect the AC charging pile to transmit the analog signal, simulate the connection between the AC charging pile and the vehicle charging terminal, so that the AC charging pile can handshake with the vehicle charging terminal according to the analog signal judgment of the AC charging pile communication control device, trigger the AC charging pile to switch to the PWM connection state, and perform power supply work; The vehicle charging simulation circuit is used to detect the connection feedback signal of the vehicle charging terminal, and generate an AC charging pile simulation signal to connect to the vehicle charging terminal, so that the vehicle charging terminal can handshake with the AC charging pile according to the simulation signal of the AC charging pile communication control device, triggering the vehicle charging pile to switch to the charging state; And receive the PWM output signal of the MCU control module and transmit it to the on-board charging pile to adjust the maximum charging power; The sampling circuit is used to detect the loop voltage signals of the charging pile simulation loop and the vehicle charging simulation loop respectively, and transmit them to the MCU control module; The MCU control module is used to receive the loop voltage signal of the sampling circuit, determine the connection status of the charging pile simulation circuit and the vehicle charging simulation circuit, and switch the DC or PWM output mode; and receive the maximum charging power signal of the communication module, calculate the PWM output signal duty cycle based on the maximum charging power signal, and transmit it to the vehicle charging simulation circuit; The communication module is used to upload the startup and operation status of the AC charging pile, receive the maximum charging power signal of the AC charging pile sent by the station area, and transmit it to the MCU control module.

2. The AC charging pile communication control device according to claim 1, characterized in that: The AC charging pile communication control device is connected to the AC charging pile and the vehicle charging terminal through a charging CP line.

3. The AC charging pile communication control device according to claim 2, characterized in that: The charging pile simulation circuit is connected to the power supply control circuit of the AC charging pile, and the vehicle-mounted charging simulation circuit is electrically connected to the vehicle-mounted charging terminal.

4. The AC charging pile communication control device according to claim 1, characterized in that: The charging pile simulation circuit includes a fourth resistor R4, a fifth resistor R5 and a third switch S3. The third switch S3 is connected in series with the fifth resistor R5 and then connected in parallel with the fourth resistor R4. One end of the fourth resistor R4 is connected to the power supply control circuit, and the other end thereof is grounded.

5. The AC charging pile communication control device according to claim 1, characterized in that: The vehicle charging simulation circuit includes a fourth switch S4 and a sixth resistor R6, one end of the fourth switch is connected in series with the sixth resistor R6, and the other end is connected to the DC output end or the PWM output end of the MCU control module; the sixth resistor R6 is connected to the vehicle charging end via the charging CP line.

6. The AC charging pile communication control device according to claim 1, characterized in that: The AC charging pile communication control device sets a first detection point at the connection point between the power supply control circuit R1 and the charging pile simulation circuit; sets a second detection point at the parallel node of the charging pile simulation circuit R4 and R5; sets a third detection point at the series node of the charging control module diode D1 and R3; and sets a fourth detection point at the connection point between the on-board charging simulation circuit R6 and the charging CP line.

7. The AC charging pile communication control device according to claim 6, characterized in that: The MCU control module is also used to receive detection signals from the first detection point, the second detection point, the third detection point and the fourth detection point, and control the switching and closing of the charging pile simulation circuit and the vehicle charging simulation circuit according to the detection signals from the first detection point and the third detection point; and adjust the simulation state of the charging pile simulation circuit and the vehicle charging simulation circuit based on the second detection point and the fourth detection point.

8. An AC charging pile communication control method, applied to the AC charging pile communication control device according to any one of claims 1 to 7, characterized in that: include: Step 1: Based on the charging pile simulation circuit and the vehicle charging simulation circuit, handshake connections are made with the AC charging pile and the vehicle charging terminal respectively; Step 2: Start the power supply action based on the AC charging pile, and obtain the maximum charging power of the AC charging pile through the communication module; Step 3: The MCU control module obtains the power supply voltage signal of the AC charging pile, determines the current given value according to the maximum charging power, obtains the duty cycle given signal based on the current given value, and converts the duty cycle given signal into a PWM analog signal; Step 4: According to the determined duty cycle of the PWM analog signal, the on-board charging terminal determines the actual charging current that matches the duty cycle mapping; Step 5: Obtain the maximum charging power of the AC charging pile issued by the station in real time, update the PWM analog signal, and adjust the actual charging current until the AC charging pile stops charging.

9. The AC charging pile communication control method according to claim 8, characterized in that: The method of determining the charging current matching the duty cycle mapping according to the determined duty cycle of the PWM analog signal is specifically as follows: When the duty cycle D of the PWM analog signal is less than 8% or greater than 97%, the actual charging current is zero and charging is not allowed; When the duty cycle D of the PWM analog signal is greater than or equal to 8% and less than 10%, the actual maximum charging current Imax is 6A; When the duty cycle D of the PWM analog signal is greater than or equal to 10% and less than 85%, the actual maximum charging current Imax=(D*100)*0.6; When the duty cycle D of the PWM analog signal is greater than or equal to 85% and less than or equal to 97%, the actual charging current Imax = (D*100-64)*2.5 and is less than or equal to 63A.

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