Charging pile charging control system and charging control method

Abstract

The invention relates to a charging pile charging control system and a charging control method. The system comprises a mains supply, an inverter and a charging pile, the charging pile can execute a corresponding charging process through any one of the two charging modes; specifically, in the green power mode, the charging pile performs charging through photovoltaic power generation, and the charging current of the charging pile is adjusted according to the current of the grid-connected port of the inverter until the power of the grid-connected port of the inverter is zero; and the other mode is an economic mode: the charging pile uses preset charging current for charging, when photovoltaic power generation is insufficient, electricity is bought from commercial power for supplementation, and when photovoltaic power generation is sufficient, the charging current of the charging pile is adjusted according to the current of the inverter grid-connected port until the power of the inverter grid-connected port is zero. According to the invention, the technical problems of power grid load increase and resource waste in the peak period due to the fact that a traditional electric vehicle charging pile depends on the commercial power for direct power supply and renewable energy sources cannot be effectively utilized in the prior art are solved.

Description

Technical Field

[0001] The present application relates to the field of charging technology, and in particular to a charging pile charging control system and a charging control method. Background Art

[0002] With the development of the global economy and the enhancement of environmental awareness, electric vehicles (EVs) have rapidly become popular due to their environmentally friendly characteristics. However, the large-scale promotion of EVs has also brought new challenges, especially in the construction of charging infrastructure and power supply. Traditionally, EVs mainly rely on municipal electricity (i.e. electricity provided by the power grid) for charging, which may not only increase the burden on the power grid during peak hours and lead to an imbalance in power supply and demand, but may also violate the original intention of promoting EVs to reduce carbon emissions due to the large consumption of non-renewable energy.

[0003] At present, there are many types of electric vehicle charging piles on the market, most of which use direct power supply from the city to charge electric vehicles. Although this charging method is simple and easy to use, it will generate a large load on the power grid during peak power consumption periods, especially after the large-scale promotion of electric vehicles, this problem is more prominent. In addition, this charging method fails to effectively utilize renewable energy, especially the electricity generated by solar power generation systems installed by household users, resulting in a waste of resources.

[0004] To address the above-mentioned problems, no effective solution has been proposed yet. Summary of the invention

[0005] The embodiments of the present application provide a charging pile charging control system and a charging control method to at least solve the technical problem in the related art that traditional electric vehicle charging piles rely on direct power supply from the mains, fail to effectively utilize renewable energy, and result in increased grid load and waste of resources during peak hours.

[0006] According to one aspect of an embodiment of the present application, a charging pile charging control system is provided, comprising: a mains supply for providing alternating current through a power grid; an inverter for converting direct current generated by photovoltaic power into alternating current; a charging pile, connected to the mains supply and the inverter, respectively, for obtaining the current and power of the inverter grid-connected port, and when a device to be charged is connected to the charging pile, identifying the charging mode of the charging pile, and charging the device to be charged according to the charging mode; wherein the charging modes include: a green mode: the charging pile uses photovoltaic power generation for charging, and adjusts the charging current of the charging pile according to the current of the inverter grid-connected port until the power of the inverter grid-connected port is zero; an eco mode: the charging pile uses a preset charging current for charging, and when photovoltaic power generation is insufficient, purchases electricity from the mains supply to supplement it, and when photovoltaic power generation is sufficient, adjusts the charging current of the charging pile according to the current of the inverter grid-connected port until the power of the inverter grid-connected port is zero.

[0007] Optionally, when the charging mode is the green power mode, when the charging pile has no communication with the inverter, the charging pile collects the current of the inverter grid-connected port through an external current transformer, and executes a corresponding charging process according to the current of the inverter grid-connected port.

[0008] Optionally, the charging pile collects the current of the inverter grid-connected port through an external current transformer, and executes a corresponding charging process according to the current of the inverter grid-connected port, including: when the charging pile starts charging, it is determined whether the current of the inverter grid-connected port is greater than or equal to a preset first charging current; if the current of the inverter grid-connected port is greater than or equal to the first charging current, the charging pile starts charging; if the current of the inverter grid-connected port is less than the first charging current, the charging pile suspends charging; during the charging process of the charging pile, the charging pile adjusts the charging current of the charging pile in real time according to the current of the inverter grid-connected port; wherein, when the inverter grid-connected port sells electricity, the charging pile increases the charging current of the charging pile; when the inverter grid-connected port buys electricity, the charging pile reduces the charging current of the charging pile; if the charging current of the charging pile is reduced to the first charging current and the duration of the inverter grid-connected port buying electricity meets the preset first time threshold, the charging pile suspends charging.

[0009] Optionally, it also includes: when the charging pile suspends charging, the charging pile detects in real time whether the current of the inverter grid-connected port is greater than or equal to the first charging current; if the current of the inverter grid-connected port is greater than or equal to the first charging current and the duration of the inverter grid-connected port selling electricity meets a preset second time threshold, the charging pile starts charging.

[0010] Optionally, when the charging mode is the green power mode, when the charging pile communicates with the inverter, the charging pile communicates with the inverter through a bus, and executes a corresponding charging process according to whether the inverter is photovoltaically limited and the current of the inverter grid-connected port.

[0011] Optionally, the charging pile communicates with the inverter through a bus, and executes a corresponding charging process according to whether the inverter is photovoltaically limited and the current of the inverter grid-connected port, including: when the charging pile starts charging, if photovoltaics are limited, the charging pile starts charging; if photovoltaics are not limited, and the current of the inverter grid-connected port is greater than or equal to a preset first charging current, the charging pile starts charging; when the charging pile is charging, if photovoltaics are limited, the charging current of the charging pile is increased until photovoltaics are not limited; if photovoltaics are not limited and the inverter grid-connected port buys electricity, the charging current of the charging pile is reduced; if the charging current of the charging pile is reduced to the preset first charging current and the duration of the inverter grid-connected port buying electricity meets a preset third time threshold, the charging pile suspends charging.

[0012] Optionally, it also includes: when the charging pile suspends charging, if photovoltaics are limited, the charging pile starts charging; if photovoltaics are not limited, and the current of the inverter grid-connected port is greater than or equal to the first charging current and the duration of the inverter grid-connected port selling electricity meets a preset second time threshold, the charging pile starts charging.

[0013] Optionally, when the charging mode is the economic mode, the charging pile sets four time periods of peak, flat and valley through software or directly through the charging pile, and executes the corresponding charging process according to the current of the inverter grid-connected port and the preset charging current.

[0014] Optionally, the preset charging current includes a first charging current, a second charging current, a third charging current and a fourth charging current, wherein the second charging current < the first charging current < the third charging current < the fourth charging current; the charging pile sets four time periods of peak, flat and valley through software or directly through the charging pile, and executes a corresponding charging process according to the current of the inverter grid-connected port and the preset charging current, including: when the charging pile works in the peak time period, if the current of the inverter grid-connected port is less than the first charging current, the charging pile suspends charging; if the current of the inverter grid-connected port is greater than or equal to the first charging current, the charging pile starts charging and charges with the current of the inverter grid-connected port; when the charging pile works in the peak time period, if the current of the inverter grid-connected port is less than the second charging current, the charging pile suspends charging; if the inverter grid-connected port If the current of the inverter grid-connected port is greater than or equal to the second charging current and less than or equal to the first charging current, the charging pile is charged with the first charging current; if the current of the inverter grid-connected port is greater than the first charging current, the charging pile is charged with the current of the inverter grid-connected port; when the charging pile works in a normal period, if the current of the inverter grid-connected port is less than or equal to the third charging current, the charging pile is charged with the third charging current; if the current of the inverter grid-connected port is greater than the third charging current, the charging pile is charged with the current of the inverter grid-connected port; when the charging pile works in a valley period, if the current of the inverter grid-connected port is less than or equal to the fourth charging current, the charging pile is charged with the fourth charging current; if the current of the inverter grid-connected port is greater than the fourth charging current, the charging pile is charged with the current of the inverter grid-connected port.

[0015] According to another aspect of the embodiment of the present application, a charging control method based on the charging pile charging control system described above is provided, including: determining a charging mode of the charging pile; wherein the charging modes include: a green power mode and an economic mode; when the charging mode is the green power mode, charging is performed using photovoltaic power generation, and the charging current of the charging pile is adjusted according to the current of the inverter grid-connected port until the power of the inverter grid-connected port is zero; or, when the charging mode is the economic mode, charging is performed using a preset charging current, and when the photovoltaic power generation is insufficient, electricity is purchased from the city power supply to supplement it, and when the photovoltaic power generation is sufficient, the charging current of the charging pile is adjusted according to the current of the inverter grid-connected port until the power of the inverter grid-connected port is zero.

[0016] In the embodiment of the present application, the system monitors the current and power of the inverter grid-connected port in real time through the charging pile, automatically adjusts the charging current of the charging pile, ensures that while meeting the charging demand, the power generated by photovoltaic power is used first, and the insufficient part is supplemented from the mains when necessary. Specifically, the present application provides two charging modes: Green power mode: In this mode, the charging pile relies entirely on the power generated by photovoltaic power to charge the electric vehicle, and dynamically adjusts the charging current to ensure that the power of the inverter grid-connected port is zero, that is, no additional power is obtained from the mains. This method minimizes the dependence on the mains and achieves green charging. Economic mode: In this mode, the charging pile first tries to charge with the power generated by photovoltaic power. When the photovoltaic power generation is not enough to meet the charging demand, it will automatically obtain additional power from the mains to make up the difference. In this process, the system still tries to keep the power of the inverter grid-connected port close to zero to reduce unnecessary electricity bills, thereby solving the technical problem that the traditional electric vehicle charging pile in the related technology relies on the mains for direct power supply, fails to effectively utilize renewable energy, and leads to increased grid load and waste of resources during peak hours, achieving the maximum utilization of renewable resources, reducing the charging cost of users, and also reducing the burden on the grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other embodiments can be obtained based on these drawings without creative work.

[0018] Figure 1 A schematic diagram of a charging pile charging control system provided in an embodiment of the present application;

[0019] Figure 2 PID algorithm flow chart provided for the embodiment of the present application;

[0020] Figure 3 A flow chart of a charging control method applied to a charging pile charging control system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0021] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present application are shown in the accompanying drawings, it should be understood that the embodiments of the present application can be implemented in various forms and should not be interpreted as being limited to the embodiments described herein. Instead, these embodiments are provided to provide a more thorough and complete understanding of the embodiments of the present application. It should be understood that the drawings and embodiments of the present application are only for exemplary purposes and are not intended to limit the scope of protection of the present application.

[0022] According to one aspect of an embodiment of the present application, a charging pile charging control system is provided. Figure 1 A schematic diagram of a charging pile charging control system provided in an embodiment of the present application, such as Figure 1 As shown, the system includes AC power, inverter and charging pile; wherein:

[0023] Mains, which is used to provide alternating current through the power grid;

[0024] Inverter, used to convert direct current generated by photovoltaic into alternating current;

[0025] The charging pile is connected to the mains and the inverter respectively, and is used to obtain the current and power of the inverter's grid-connected port, and when the device to be charged is connected to the charging pile, identify the charging mode of the charging pile, and charge the device to be charged according to the charging mode;

[0026] Among them, the charging modes include: green mode: the charging pile uses photovoltaic power generation for charging, and adjusts the charging current of the charging pile according to the current of the inverter grid port until the power of the inverter grid port is zero; economic (eco) mode: the charging pile uses a preset charging current for charging, and purchases electricity from the city power supply when photovoltaic power generation is insufficient. When photovoltaic power generation is sufficient, the charging current of the charging pile is adjusted according to the current of the inverter grid port until the power of the inverter grid port is zero.

[0027] In response to the above problems, this application proposes a charging pile charging control system. The system monitors the current and power of the inverter grid-connected port in real time through the charging pile, automatically adjusts the charging current of the charging pile, and ensures that while meeting the charging demand, the power generated by photovoltaic power is used first, and the shortfall is supplemented by the mains power when necessary. Specifically, this application provides two charging modes:

[0028] Green power mode: In this mode, the charging pile completely relies on the electricity generated by the photovoltaic system to charge the electric vehicle, and dynamically adjusts the charging current to ensure that the power of the inverter grid port is zero, that is, no additional power is obtained from the mains. This method minimizes the dependence on the mains and achieves green charging.

[0029] Economic mode: In this mode, the charging pile first tries to use the power generated by photovoltaics for charging. When the photovoltaic power generation is not enough to meet the charging demand, it will automatically obtain additional power from the mains to make up the difference. During this process, the system still tries to keep the power of the inverter grid-connected port close to zero to reduce unnecessary electricity expenses.

[0030] In the embodiments of the present application, the photovoltaic system and the charging pile are effectively integrated through the system, which maximizes the utilization of renewable resources, reduces the charging cost of users, and also reduces the burden on the power grid. In addition, by flexibly switching between different charging modes, the present application can adapt to different charging demand scenarios, which not only ensures the charging efficiency of users, but also promotes environmental protection and sustainable development.

[0031] The above-mentioned devices to be charged include but are not limited to electric vehicles, electric trucks and other devices driven by electrical energy.

[0032] Optionally, the green power mode is suitable for scenarios where the owner has no need to use the car. At this time, the charging pile is charged with green electricity (electricity generated by photovoltaics) until it is fully charged. As a specific implementation method, the charging pile works in pure green power mode, and the charging pile and the inverter establish communication through a bus (for example, RS485, etc.). The inverter collects the current and power of the inverter grid port through an electric meter, and sends the collected results to the charging pile after processing. The charging pile adjusts the charging current of the charging pile in real time according to the current of the inverter grid port through the proportional-integral-differential (Proportional-Integral-Derivative, PID) algorithm, thereby adjusting the power of the inverter grid port to zero. In the PID algorithm, the power of the inverter grid port is used as the input error, and zero is used as the target value of the power of the inverter grid port. The integral separation method is used for calculation.

[0033] Optionally, the economic mode is suitable for scenarios where the owner needs to use the car but it is not urgent. At this time, the charging pile can meet the demand by charging with a certain power. As a specific implementation method, the charging pile works in the economic mode. In this mode, the user needs to set the charging current. The charging pile and the inverter establish communication through the bus. The inverter collects the current and power of the inverter grid port through the electric meter and sends the collection results to the charging pile. When the photovoltaic power generation is insufficient and the electricity is purchased from the city power, the charging pile is charged with the charging current set by the user to ensure that the car can be charged with the current set by the user at the minimum. When the photovoltaic power generation is sufficient and electricity is sold through the inverter grid port, the charging pile adjusts the charging current of the charging pile in real time according to the selling current of the inverter grid port through the PID algorithm, so as to adjust the power of the inverter grid port to zero. In the PID algorithm, the power of the inverter grid port is used as the input error, and zero is used as the target value of the power of the inverter grid port. The integral separation method is used for calculation.

[0034] In ordinary PID control, the purpose of introducing the integral link is mainly to eliminate static error and improve control accuracy. However, when starting, ending or significantly increasing or decreasing the setting, the system output has a large deviation in a short period of time, which will cause the integral accumulation of the PID operation, resulting in the control amount exceeding the maximum action range corresponding to the limit control amount allowed by the actuator, thereby causing a large overshoot or even oscillation, which is absolutely not allowed. In order to overcome this problem, the concept of integral separation is introduced. Its basic idea is to cancel the integral effect when the controlled amount deviates greatly from the set value; when the controlled amount is close to the given value, the integral control is introduced to eliminate the static error and improve the accuracy. Figure 2 The PID algorithm flow chart provided in the embodiment of the present application is as follows: Figure 2 As shown, the process of the PID algorithm includes target parameter initialization, such as setting the power of the inverter grid-connected port (y), the actual power of the inverter grid-connected port (r), and calculating the error value (e=yr); through timing (such as setting the time threshold to 1s, etc.), calculating the corresponding target power (T=e*Kp+e*Ki+e*Kd), the actual charging power value, and the control output, etc.

[0035] As an optional embodiment, when the charging mode is the green power mode, when the charging pile has no communication with the inverter, the charging pile collects the current of the inverter grid-connected port through an external current transformer, and executes the corresponding charging process according to the current of the inverter grid-connected port.

[0036] The above charging pile is a single-phase AC charging pile. There is no communication between the single-phase AC charging pile and the non-zero output inverter (which allows the inverter to sell electricity to the grid). When working independently, the charging pile requires an external current transformer for sampling. The current transformer is connected to the inverter grid-connected port (also called the grid-connected port) to obtain the current of the inverter grid-connected port.

[0037] It should be noted that the charging pile is responsible for charging electric vehicles. The current transformer is externally connected to the inverter grid port to sample the current of the inverter grid port. The inverter grid port is the grid port, which is the interface for connecting to the power grid.

[0038] In the embodiment of the present application, in the green power mode, when the charging pile and the inverter are not communicating, the current of the inverter grid-connected port is sampled by an external current transformer, and the charging strategy is dynamically adjusted according to the current of the inverter grid-connected port. This method can maximize the use of photovoltaic power and achieve true green charging.

[0039] Furthermore, the charging pile collects the current of the inverter grid-connected port through an external current transformer, and executes a corresponding charging process according to the current of the inverter grid-connected port, including: when the charging pile starts charging, it determines whether the current of the inverter grid-connected port is greater than or equal to a preset first charging current; if the current of the inverter grid-connected port is greater than or equal to the first charging current, the charging pile starts charging; if the current of the inverter grid-connected port is less than the first charging current, the charging pile suspends charging; during the charging process of the charging pile, the charging pile adjusts the charging current in real time according to the current of the inverter grid-connected port; wherein, when the inverter grid-connected port sells electricity, the charging pile increases the charging current of the charging pile; when the inverter grid-connected port buys electricity, the charging pile reduces the charging current of the charging pile; if the charging current of the charging pile is reduced to the first charging current and the duration of the inverter grid-connected port buying electricity meets the preset first time threshold, the charging pile suspends charging.

[0040] Optionally, the first time threshold and the first charging current can be flexibly set according to the needs of the application scenario. For example, the first charging current includes but is not limited to 6A. The first time threshold includes but is not limited to 30s, 1min, etc.

[0041] The following is an illustration taking the first charging current 6A as an example.

[0042] Optionally, when the charging pile starts charging: the charging pile will determine whether the current of the inverter grid-connected port is greater than or equal to 6A. If the current of the inverter grid-connected port is greater than or equal to 6A, the charging pile will start charging with a 10% duty cycle; if the current of the inverter grid-connected port is less than 6A, the charging pile will suspend charging.

[0043] Optionally, during the charging process, the charging pile will adjust the charging current in real time according to the current of the inverter grid port. When the inverter grid port sells electricity, the charging pile will increase the charging current, and when the inverter grid port buys electricity, the charging pile will reduce the charging current. If the charging current of the charging pile is reduced to 6A, and the inverter grid port is still buying electricity for one minute, the charging pile will stop charging.

[0044] Furthermore, it also includes: when the charging pile suspends charging, the charging pile detects in real time whether the current of the inverter grid-connected port is greater than the first charging current; if the current of the inverter grid-connected port is greater than or equal to the first charging current and the duration of the inverter grid-connected port selling electricity meets a preset second time threshold, the charging pile starts charging.

[0045] The second time threshold can be flexibly set according to the needs of the application scenario. For example, the second time threshold includes but is not limited to 30s, 1min, etc.

[0046] Optionally, the charging pile suspends charging: during the charging pile suspending charging, the charging pile will detect in real time whether the current of the inverter grid-connected port is greater than or equal to 6A. If the current of the inverter grid-connected port is greater than or equal to 6A and lasts for one minute, the charging pile starts charging.

[0047] In the embodiment of the present application, the current of the inverter grid-connected port is monitored in real time through an external current transformer, thereby avoiding the waste of photovoltaic power. When the photovoltaic power is sufficient, the charging pile increases the charging current to make full use of the photovoltaic power; when the photovoltaic power is insufficient, the charging pile reduces the charging current until charging stops, thereby reducing the power purchased from the grid.

[0048] The charging pile collects the current of the inverter grid-connected port in real time through an external current transformer, which can quickly respond to changes in the photovoltaic state and realize intelligent charging management. This intelligent management not only improves the charging efficiency, but also extends the service life of the electric vehicle battery. Without manual intervention by the user, the charging pile can automatically adjust the charging strategy according to the current of the inverter grid-connected port, providing a more convenient and efficient charging experience. The real-time monitoring and dynamic adjustment functions ensure the stability and reliability of the charging process, reducing the user's waiting time and charging costs.

[0049] As an optional embodiment, when the charging mode is the green power mode, when the charging pile communicates with the inverter, the charging pile communicates with the inverter through the bus, and executes the corresponding charging process according to whether the inverter is photovoltaically limited and the current of the inverter grid-connected port.

[0050] Optionally, the single-phase AC charging pile and the inverter communicate. When the charging pile is matched, the charging pile communicates with the inverter through a bus (for example, RS485, etc.), and the inverter sends the current information of the inverter grid-connected port to the charging pile. It should be noted that photovoltaics are limited to the inverter's ability to generate electricity, but cannot generate too much electricity (it is not allowed to sell electricity to the grid or it is allowed to sell a small amount of electricity to the grid).

[0051] It should be noted that the charging pile is responsible for charging electric vehicles. The inverter is used to convert the direct current generated by photovoltaics into alternating current, and at the same time control the power size and direction of the inverter grid-connected port. The RS485 communication interface is a communication channel set between the charging pile and the inverter, which is used to transmit photovoltaic status and charging control instructions in real time.

[0052] In an embodiment of the present application, in the green power mode, the electric vehicle charging pile and the inverter exchange data in real time through the RS485 communication interface, and dynamically adjust the charging strategy according to whether the inverter is photovoltaically limited and the current of the inverter grid-connected port.

[0053] Furthermore, the charging pile communicates with the inverter through the bus, and executes a corresponding charging process according to whether the inverter is photovoltaically limited and the current of the inverter grid-connected port, including: when the charging pile starts charging, it determines whether to start charging according to whether the inverter is photovoltaically limited; if photovoltaically limited, the charging pile starts charging; if photovoltaically not limited, and the current of the inverter grid-connected port is greater than or equal to a preset first charging current, the charging pile starts charging; when the charging pile is charging, if the inverter is photovoltaically limited, the charging current of the charging pile is increased until photovoltaically not limited; if photovoltaically not limited and the inverter grid-connected port buys electricity, the charging current of the charging pile is reduced; if the charging current of the charging pile is reduced to the first charging current and the duration of the inverter grid-connected port buying electricity meets the preset third time threshold, the charging pile suspends charging.

[0054] The third time threshold may be flexibly set according to the needs of the application scenario. For example, the third time threshold includes but is not limited to 30 seconds, 1 minute, etc.

[0055] Optionally, when the charging pile starts charging: the charging pile will determine whether charging can be started based on whether the inverter is photovoltaically limited. When photovoltaics are limited, the charging pile starts charging; when photovoltaics are not limited, it is also necessary to combine the current of the inverter grid-connected port to further determine whether the charging pile starts charging, that is, when photovoltaics are not limited and the current of the inverter grid-connected port is greater than or equal to the preset first charging current, the charging pile starts charging; except for the above situations, the charging pile will suspend charging.

[0056] Optionally, when the charging pile starts the charging phase, when photovoltaic power is limited, since the selling current of the inverter grid-connected port is limited, it is impossible to accurately know whether the selling current of the inverter grid-connected port is equal to the actual power generation current of the current inverter. It can be understood that when photovoltaic power is limited, charging is started regardless of the selling current of the inverter grid-connected port. During the startup process, if the inverter grid-connected port detects a buying current, and the duration of the buying current meets the preset third time threshold, the charging pile suspends charging.

[0057] Specifically, when photovoltaic power is limited, and the electricity selling current of the inverter grid-connected port is less than the first charging current, the charging pile starts charging and charges according to the first charging current. During the startup process, the inverter grid-connected port detects the electricity buying current, and the duration of the electricity buying current meets the preset third time threshold, and the charging pile suspends charging; when photovoltaic power is limited, and the electricity selling current of the inverter grid-connected port is greater than the first charging current, the charging pile starts charging. At this time, the actual power generation current of the inverter must be greater than the first charging current, and the charging pile charges according to the actual current.

[0058] Optionally, when the charging pile is charging: if photovoltaics are limited, increase the charging current of the charging pile until photovoltaics are not limited; if photovoltaics are not limited and the inverter grid port is buying electricity, then the charging pile reduces the charging current; if the charging current of the charging pile is reduced to 6A, the inverter grid port is still buying electricity and continues for one minute, the charging pile suspends charging.

[0059] Furthermore, it also includes: when the charging pile suspends charging, if photovoltaics are limited, the charging pile starts charging; if photovoltaics are not limited, and the current of the inverter grid-connected port is greater than or equal to the first charging current and the duration of the inverter grid-connected port selling electricity meets a preset second time threshold, the charging pile starts charging.

[0060] The second time threshold may be flexibly set according to the needs of the application scenario. For example, the second time threshold includes but is not limited to 30 seconds, 1 minute, etc.

[0061] Optionally, the charging pile suspends charging: during the charging pile suspending charging, when photovoltaic power is limited, the charging pile starts charging; when photovoltaic power is not limited, the charging pile will detect in real time whether the current of the inverter grid-connected port is greater than or equal to 6A. If the current of the inverter grid-connected port is greater than or equal to 6A and lasts for one minute, the charging pile starts charging.

[0062] In the embodiments of the present application, by real-time monitoring of the photovoltaic status of the inverter, the charging pile can give priority to using photovoltaic power for charging when photovoltaic power is limited, thereby avoiding waste of photovoltaic power.

[0063] As an optional embodiment, when the charging mode is the economic mode, the charging pile sets four time periods of peak, flat and valley through software or directly through the charging pile, and executes the corresponding charging process according to the current of the inverter grid port and the preset charging current.

[0064] In the embodiment of the present application, four time periods of peak, flat and valley are pre-set by software or directly through the charging pile, and the charging current of the charging pile is dynamically adjusted according to the current of the inverter grid-connected port in different time periods and the preset charging current value. This method can maximize the use of renewable energy, reduce the pressure on the power grid during peak hours, and reduce the charging cost of users.

[0065] Furthermore, the preset charging current includes a first charging current, a second charging current, a third charging current and a fourth charging current, wherein the second charging current < the first charging current < the third charging current < the fourth charging current; the charging pile sets four time periods of peak, flat and valley through software or directly through the charging pile, and executes a corresponding charging process according to the current of the inverter grid port and the preset charging current, including: when the charging pile works in the peak time period, if the current of the inverter grid port is less than the first charging current, the charging pile suspends charging; if the current of the inverter grid port is greater than or equal to the first charging current, the charging pile starts charging and charges with the current of the inverter grid port; when the charging pile works in the peak time period, if the current of the inverter grid port is less than the second charging current, the charging pile suspends charging; if If the current of the inverter grid-connected port is greater than or equal to the second charging current and less than or equal to the first charging current, the charging pile is charged with the first charging current; if the current of the inverter grid-connected port is greater than the first charging current, the charging pile is charged with the current of the inverter grid-connected port; when the charging pile operates in normal period, if the current of the inverter grid-connected port is less than or equal to the third charging current, the charging pile is charged with the third charging current; if the current of the inverter grid-connected port is greater than the third charging current, the charging pile is charged with the current of the inverter grid-connected port; when the charging pile operates in valley period, if the current of the inverter grid-connected port is less than or equal to the fourth charging current, the charging pile is charged with the fourth charging current; if the current of the inverter grid-connected port is greater than the fourth charging current, the charging pile is charged with the current of the inverter grid-connected port.

[0066] The above preset charging currents can be set according to the needs of the application scenario. For example, the first charging current includes but is not limited to 6A, the second charging current includes but is not limited to 3A, the third charging current includes but is not limited to 10A, and the fourth charging current includes but is not limited to 20A.

[0067] The following description is made by taking the first charging current as 6A, the second charging current as 3A, the third charging current as 10A, and the fourth charging current as 20A as an example.

[0068] Optionally, when the charging pile is working in the peak period: when the current of the inverter grid-connected port is less than 6A, the charging pile suspends charging. When the current of the inverter grid-connected port of the charging pile is greater than or equal to 6A, charging is started, and the charging current is adjusted in real time according to the actual current size of the inverter grid-connected port to charge. For example, when the current of the inverter grid-connected port is 10A, the charging pile charges at 10A.

[0069] Optionally, when the charging pile works in the peak period: when the current of the inverter grid port is less than 3A, the charging pile suspends charging. When the current of the inverter grid port is greater than or equal to 3A and less than or equal to 6A, the charging pile charges at 6A. When the current of the inverter grid port is greater than 6A, the charging pile charges with the actual current of the inverter grid port. For example, when the current of the inverter grid port is 2A, the charging pile suspends charging. When the current of the inverter grid port is 4A, the charging pile charges at 6A. When the current of the inverter grid port is 10A, the charging pile charges at 10A.

[0070] Optionally, when the charging pile works in normal time: when the current of the inverter grid-connected port is less than or equal to 10A, the charging pile is charged at 10A. When the current of the inverter grid-connected port is greater than 10A, the charging pile is charged with the actual current of the inverter grid-connected port.

[0071] Optionally, when the charging pile works in the valley period: when the current of the inverter grid-connected port is less than or equal to 20 A, the charging pile is charged at 20 A. When the current of the inverter grid-connected port is greater than 20 A, the charging pile is charged with the actual current of the inverter grid-connected port.

[0072] In an embodiment of the present application, by dynamically adjusting the charging current and giving priority to the current of the inverter grid-connected port, the utilization rate of renewable energy is effectively improved and the dependence on non-renewable resources is reduced. In economic mode, the charging pile can automatically select the optimal charging strategy according to the current of the inverter grid-connected port and the different time periods of the grid electricity price, helping users avoid charging during peak electricity price periods, thereby significantly reducing charging costs. Especially during peak and off-peak periods, the charging pile can reduce dependence on the grid through intelligent scheduling, which helps to balance the grid load and avoid grid overload. Users can set and monitor the charging process through software or directly through the charging pile, and enjoy more convenient and efficient charging services.

[0073] According to another aspect of an embodiment of the present application, a charging control method based on the above-mentioned charging pile charging control system is provided. Figure 3 A flow chart of a charging control method for a charging pile charging control system provided in an embodiment of the present application, such as Figure 3 As shown, the method comprises the following steps:

[0074] Step S302, determining the charging mode of the charging pile; wherein the charging mode includes: green power mode and economic mode;

[0075] Step S304, when the charging mode is the green power mode, photovoltaic power generation is used for charging, and the charging current of the charging pile is adjusted according to the current of the inverter grid-connected port until the power of the inverter grid-connected port is zero; or, when the charging mode is the economic mode, a preset charging current is used for charging, and when photovoltaic power generation is insufficient, electricity is purchased from the city power supply to supplement it. When photovoltaic power generation is sufficient, the charging current of the charging pile is adjusted according to the current of the inverter grid-connected port until the power of the inverter grid-connected port is zero.

[0076] Green power mode: The charging pile relies entirely on the power generated by photovoltaics for charging. By adjusting the charging power in real time, the power of the inverter grid port is ensured to be zero, that is, no additional power is obtained from the mains. Using photovoltaic power generation for charging, the charging power of the charging pile is adjusted in real time to ensure that the power of the inverter grid port is zero. If photovoltaics generate enough power, the charging pile will charge at full power; if the power generated by photovoltaics is insufficient, the charging pile will reduce the charging power to avoid obtaining additional power from the mains.

[0077] Economic mode: The charging pile first tries to charge with the power generated by photovoltaics. When photovoltaic power generation is insufficient, it purchases electricity from the mains to supplement it. When photovoltaic power generation is sufficient, it adjusts the charging current in real time until the power of the inverter grid-connected port is zero. Use the preset charging current for charging. If photovoltaic power generation is insufficient, the charging pile will purchase electricity from the mains to supplement it. If photovoltaic power generation is sufficient, the charging pile will adjust the charging current in real time to make the power of the inverter grid-connected port zero, that is, minimize the power obtained from the mains.

[0078] In the embodiment of the present application, through the green power mode, the charging pile can give priority to using this part of electricity for charging when the photovoltaic power generates enough electricity, thereby avoiding the waste of photovoltaic power. In the economic mode, the charging pile gives priority to using photovoltaic power, and only buys electricity from the mains when the photovoltaic power is insufficient, further improving the utilization rate of photovoltaic power. By adjusting the charging power in real time, ensuring that the power of the inverter grid-connected port is zero, it is avoided to obtain additional power from the power grid during peak hours, thereby reducing the burden on the power grid. In particular, in the green power mode, the charging pile is completely independent of the mains, further reducing the dependence on the power grid. By giving priority to the use of photovoltaic power, the cost of purchasing electricity from the mains is reduced, thereby saving charging costs for users. In the economic mode, the charging pile can dynamically adjust the charging strategy according to the real-time status of photovoltaic power, further optimizing the charging cost. Users can charge according to their needs and the actual situation of photovoltaic power by selecting different charging modes, providing a more flexible and convenient charging experience. The real-time monitoring and dynamic adjustment functions ensure the stability and reliability of the charging process, reducing the waiting time and charging costs of users.

[0079] Furthermore, it also includes the following steps: when the charging mode is the green power mode, when there is no communication between the charging pile and the inverter, the charging pile collects the current of the inverter grid-connected port through an external current transformer, and executes the corresponding charging process according to the current of the inverter grid-connected port.

[0080] Furthermore, it also includes the step of, when the charging mode is the green power mode, when the charging pile communicates with the inverter, the charging pile communicates with the inverter through a bus, and executes the corresponding charging process according to whether the inverter is photovoltaically limited and the current of the inverter grid-connected port.

[0081] Furthermore, it also includes the steps of setting four time periods of peak, flat and valley through software or directly through the charging pile when the charging mode is the economic mode, and executing the corresponding charging process according to the current of the inverter grid-connected port and the preset charging current.

[0082] It should be noted that the term "including" and its variations used in the embodiments of the present application are open inclusions, that is, "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments". The modifications of "one" and "multiple" mentioned in the embodiments of the present application are illustrative and not restrictive. Those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0083] The various steps described in the method implementation methods provided in the embodiments of the present application can be performed in different orders and / or in parallel. In addition, the method implementation methods may include additional steps and / or omit the steps shown. The scope of protection of the present application is not limited in this respect.

[0084] The term "embodiment" in this specification refers to specific features, structures or characteristics described in conjunction with the embodiment that can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor does it mean that it is mutually exclusive with other embodiments and is independent or optional. The various embodiments in this specification are described in a related manner, and the same or similar parts between the various embodiments refer to each other. In particular, for the device, equipment, and system embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts refer to the partial description of the method embodiment.

[0085] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of patent protection. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the scope of protection of the present application. Therefore, the scope of protection of the present application shall be subject to the attached claims.

Claims

1. A charging pile charging control system, characterized in that: include: Mains, which is used to provide alternating current through the power grid; Inverter, used to convert direct current generated by photovoltaic into alternating current; A charging pile, connected to the mains and the inverter, respectively, for obtaining the current and power of the inverter grid-connected port, and identifying the charging mode of the charging pile when the device to be charged is connected to the charging pile, and charging the device to be charged according to the charging mode; Wherein, the charging mode includes: Green power mode: the charging pile uses photovoltaic power generation for charging, and adjusts the charging current of the charging pile according to the current of the inverter grid-connected port until the power of the inverter grid-connected port is zero; Economic mode: The charging pile uses a preset charging current for charging. When photovoltaic power generation is insufficient, electricity is purchased from the city power grid to supplement it. When photovoltaic power generation is sufficient, the charging current of the charging pile is adjusted according to the current of the inverter grid-connected port until the power of the inverter grid-connected port is zero.

2. The charging pile charging control system according to claim 1, characterized in that: When the charging mode is the green power mode, when the charging pile has no communication with the inverter, the charging pile collects the current of the inverter grid-connected port through an external current transformer, and executes a corresponding charging process according to the current of the grid-connected port.

3. The charging pile charging control system according to claim 1, characterized in that: The charging pile samples the current of the inverter grid-connected port through an external current transformer, and executes a corresponding charging process according to the current of the inverter grid-connected port, including: When the charging pile starts charging, it is determined whether the current of the inverter grid-connected port is greater than or equal to a preset first charging current; if the current of the grid-connected port is greater than or equal to the first charging current, the charging pile starts charging; if the current of the inverter grid-connected port is less than the first charging current, the charging pile suspends charging; During the charging process of the charging pile, the charging pile adjusts the charging current of the charging pile in real time according to the current of the inverter grid-connected port; when the inverter grid-connected port sells electricity, the charging pile increases the charging current of the charging pile; when the inverter grid-connected port buys electricity, the charging pile reduces the charging current of the charging pile; if the charging current of the charging pile is reduced to the first charging current and the duration of the inverter grid-connected port buying electricity meets the preset first time threshold, the charging pile suspends charging.

4. The charging pile charging control system according to claim 3, characterized in that: Also includes: When the charging pile suspends charging, the charging pile detects in real time whether the current of the inverter grid-connected port is greater than or equal to the first charging current; if the current of the inverter grid-connected port is greater than or equal to the first charging current and the duration of the inverter grid-connected port selling electricity meets a preset second time threshold, the charging pile starts charging.

5. The charging pile charging control system according to claim 1, characterized in that: When the charging mode is the green power mode, when the charging pile communicates with the inverter, the charging pile communicates with the inverter through a bus, and executes a corresponding charging process according to whether the inverter is photovoltaically limited and the current of the inverter grid-connected port.

6. The charging pile charging control system according to claim 5, characterized in that: The charging pile communicates with the inverter via a bus, and executes a corresponding charging process according to whether the inverter is photovoltaically limited and the current of the inverter grid-connected port, including: When the charging pile starts charging, if photovoltaic power is limited, the charging pile starts charging; if photovoltaic power is not limited and the current of the inverter grid-connected port is greater than or equal to a preset first charging current, the charging pile starts charging; When the charging pile is charging, if photovoltaics are limited, the charging current of the charging pile is increased; if photovoltaics are not limited and the inverter grid-connected port buys electricity, the charging current of the charging pile is reduced; if the charging current of the charging pile is reduced to the first charging current and the duration of the inverter grid-connected port buying electricity meets a preset third time threshold, the charging pile suspends charging.

7. The charging pile charging control system according to claim 6, characterized in that: Also includes: When the charging pile suspends charging, if photovoltaics are limited, the charging pile starts charging; if photovoltaics are not limited, and the current of the inverter grid-connected port is greater than or equal to the first charging current and the duration of the inverter grid-connected port selling electricity meets a preset second time threshold, the charging pile starts charging.

8. The charging pile charging control system according to claim 1, characterized in that: When the charging mode is the economic mode, the charging pile sets four time periods of peak, flat and valley through software or directly through the charging pile, and executes the corresponding charging process according to the current of the inverter grid-connected port and the preset charging current.

9. The charging pile charging control system according to claim 8, characterized in that: The preset charging current includes a first charging current, a second charging current, a third charging current and a fourth charging current, wherein the second charging current < the first charging current < the third charging current < the fourth charging current; the charging pile sets four time periods of peak, flat and valley through software or directly through the charging pile, and executes a corresponding charging process according to the current of the inverter grid-connected port and the preset charging current, including: When the charging pile is working in the peak period, if the current of the inverter grid-connected port is less than the first charging current, the charging pile suspends charging; if the current of the inverter grid-connected port is greater than or equal to the first charging current, the charging pile starts charging and charges with the current of the inverter grid-connected port; When the charging pile works in the peak period, if the current of the inverter grid-connected port is less than the second charging current, the charging pile suspends charging; if the current of the inverter grid-connected port is greater than or equal to the second charging current and less than or equal to the first charging current, the charging pile is charged with the first charging current; if the current of the inverter grid-connected port is greater than the first charging current, the charging pile is charged with the current of the inverter grid-connected port; When the charging pile works in normal time, if the current of the inverter grid-connected port is less than or equal to the third charging current, the charging pile is charged with the third charging current; if the current of the inverter grid-connected port is greater than the third charging current, the charging pile is charged with the current of the inverter grid-connected port; When the charging pile operates in the valley period, if the current of the inverter grid-connected port is less than or equal to the fourth charging current, the charging pile is charged with the fourth charging current; if the current of the inverter grid-connected port is greater than the fourth charging current, the charging pile is charged with the current of the inverter grid-connected port.

10. A charging control method based on the charging pile charging control system according to any one of claims 1 to 9, characterized in that: include: Determine the charging mode of the charging pile; wherein the charging mode includes: green power mode and economic mode; When the charging mode is the green power mode, photovoltaic power generation is used for charging, and the charging current of the charging pile is adjusted according to the current of the inverter grid-connected port until the power of the inverter grid-connected port is zero; or, when the charging mode is the economic mode, a preset charging current is used for charging, and when photovoltaic power generation is insufficient, electricity is purchased from the city power grid to supplement it. When photovoltaic power generation is sufficient, the charging current of the charging pile is adjusted according to the current of the inverter grid-connected port until the power of the inverter grid-connected port is zero.

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