Charging terminal, charging control method, storage medium and computer equipment

Abstract

The invention discloses a charging terminal, a charging control method, a storage medium and computer equipment. A switch assembly and a charging controller are arranged in the charging terminal, the switch assembly comprises a plurality of switch devices, a detection device and a load balancing controller are arranged in a charging station where the charging terminal is located, and the detection device is used for detecting current detection signals of three phase lines in the charging station; the load balancing controller is used for generating a scheduling instruction based on the current detection signal; the charging controller is used for generating a switch control instruction based on the scheduling instruction; and the switch assembly is used for controlling two switch devices in the switch assembly to be closed based on the switch control instruction, so that a load to be charged is connected with two phase lines in the three phase lines, and charging is carried out. According to the charging terminal, dynamic adjustment of the power load of the double-phase line charging terminal can be achieved, the power supply capacity of a station is utilized to the maximum extent, and the installation and maintenance cost of a charging system is reduced.

Description

Technical Field

[0001] The present application relates to the field of charging control technology, and in particular to a charging terminal, a charging control method, a storage medium and a computer device. Background Art

[0002] With the rapid development of the new energy industry, the popularity of new energy products (such as electric vehicles) is increasing, and the demand for energy (such as electricity) is also increasing. At present, there are a wide range of new energy products, mainly including single-phase charging equipment, two-phase charging equipment and three-phase charging equipment, etc. Among them, for different types of energy equipment, charging stations usually need to be equipped with corresponding charging terminals.

[0003] Two-phase charging equipment is widely used in some countries and regions, and charging stations usually need to be equipped with some two-phase charging terminals to meet charging needs. When configuring two-phase charging terminals, they are often grouped and a pair of phase lines are selected for each group of charging terminals for connection, so that the number of charging terminals connected to each phase line is in a relatively balanced state. However, when a vehicle enters the station for charging, it is usually necessary for on-site personnel to guide it. If the guidance is not timely, there may be a problem of load imbalance, which poses a major safety hazard. In addition, the above configuration method is not convenient for the installation and maintenance of the charging terminal, and the labor cost required is high. Summary of the invention

[0004] In view of this, the embodiments of the present application provide a charging terminal, a charging control method, a storage medium and a computer device, the main purpose of which is to solve the technical problems that the charging terminal cannot dynamically adjust the load balance within the charging station, and the installation and maintenance of the charging terminal are highly complex and have high labor costs.

[0005] According to one aspect of the present application, a charging terminal is provided, wherein a switch component and a charging controller are provided in the charging terminal, wherein the switch component includes a plurality of switch devices, and a detection device and a load balancing controller are provided in the charging station where the charging terminal is located, wherein:

[0006] The input end of the detection device is connected to the grid side of the three phase lines, the output end of the detection device is connected to each charging terminal in the charging station, the signal output end of the detection device is connected to the load balancing controller, and the load balancing controller is also connected to the charging controller of each charging terminal in the charging station;

[0007] The charging terminal comprises three input terminals and two output terminals, the switch component is connected between the input terminals and the output terminals of the charging terminal, and the control terminal of the switch component is connected to the charging controller;

[0008] The detection device is used to detect the current detection signals of the three phase lines in the charging station; the load balancing controller is used to generate a scheduling instruction based on the current detection signal; the charging controller is used to generate a switch control instruction based on the scheduling instruction; the switch assembly is used to control the closure of two switching devices in the switch assembly based on the switch control instruction, so that the load to be charged is connected to two of the three phase lines and charged.

[0009] Optionally, the switch assembly includes three input ends and two output ends, and the switch assembly includes at least four switching devices, wherein the three input ends of the switch assembly are respectively connected to the three phase lines through the detection device; the two output ends of the switch assembly are connected to the three input ends of the switch assembly through multiple switching devices, wherein each of the switching devices is connected in series between an input end and an output end of the switch assembly, and at least one of the three input ends of the switch assembly is respectively connected to the two output ends of the switch assembly through two of the switching devices; in the same charging period, the two switching devices respectively connected to the two output ends of the switch assembly are in a closed state, and the two closed switching devices are respectively connected to different input ends.

[0010] Optionally, the switch component includes four switching devices, wherein the two output ends of the switch component are connected to the two input ends of the switch component through two of the switching devices, respectively, wherein each of the switching devices is connected in series between an input end and an output end of the switch component, and one of the three input ends of the switch component is connected to the two output ends of the switch component through two of the switching devices.

[0011] Optionally, the switch component includes five switching devices, wherein one output end of the switch component is connected to the two input ends of the switch component through two of the switching devices, and the other output end of the switch component is connected to the three input ends of the switch component through three of the switching devices, wherein each of the switching devices is connected in series between an input end and an output end of the switch component.

[0012] Optionally, the switch component includes six switch devices, wherein the two output ends of the switch component are connected to the three input ends of the switch component through three of the switch devices respectively, and wherein each of the switch devices is connected in series between an input end and an output end of the switch component.

[0013] Optionally, the scheduling instruction also includes a current regulation instruction and / or a power regulation instruction; the charging controller is also used to charge the load to be charged based on the current value indicated in the current regulation instruction, and / or to charge the load to be charged based on the power value indicated in the power regulation instruction.

[0014] Optionally, the load balancing controller: in response to detecting that a power usage status of any load in the charging station changes, obtains the power balance parameters of the charging station and the required power of each charging terminal and non-charging load in the charging station; based on the power balance parameters of the charging station and the required power of each charging terminal and non-charging load, determines the target phase line corresponding to each charging terminal, and calculates the power to be allocated of each charging terminal in the charging station, wherein the target phase line is two of the three phase lines on the grid side; generates a scheduling instruction based on the target phase line corresponding to each charging terminal and the power to be allocated of each charging terminal in the charging station.

[0015] Optionally, the sum of the powers to be allocated of all loads connected to the same phase line in the charging station is less than the power to be allocated corresponding to the phase line; the sum of the powers to be allocated of all loads in the charging station is less than the power to be allocated corresponding to the charging station.

[0016] Optionally, the load balancing controller replaces the power balance parameter with a current balance parameter, replaces the required power with a required current, and replaces the power to be allocated with a current to be allocated, and generates a scheduling instruction.

[0017] Optionally, a communication controller is further provided in the charging terminal, and the communication controller is connected to the charging controller, and the charging controller is communicatively connected to the load balancing controller via the communication controller.

[0018] Optionally, the load balancing controller is arranged at at least one location among the charging terminal, the local charging station and the cloud server; when the load balancing controller is arranged in the charging terminal, the charging controller in the charging terminal is used as the load balancing controller, and the load balancing controller is communicatively connected with the communication controllers of other charging terminals in the charging station through the communication controller; and / or, when the load balancing controller is arranged locally in the charging station, the load balancing controller is communicatively connected with the communication controllers of each charging terminal in the charging station through a communication module; and / or, when the load balancing controller is arranged in the cloud server, the load balancing controller is communicatively connected with the communication controllers of each charging terminal in the charging station through a network.

[0019] Optionally, a current detection module is further provided in the charging terminal, and the current detection module is connected to the charging controller, and the current detection module is used to detect the actual charging power of the charging terminal.

[0020] According to another aspect of the present application, a charging control method is provided, the method comprising:

[0021] In response to detecting that any load in the charging station changes its power usage state, obtaining a power balance parameter of the charging station and power requirements of each charging terminal and non-charging load in the charging station;

[0022] Based on the power balance parameters of the charging station and the required power of each of the charging terminals and non-charging loads, determine the target phase line corresponding to each charging terminal, and calculate the power to be allocated for each charging terminal in the charging station, wherein the target phase line is two of the three phase lines on the grid side;

[0023] A scheduling instruction is generated based on the target phase line corresponding to each charging terminal and the power to be allocated of each charging terminal in the charging station.

[0024] Optionally, obtaining the power balance parameters of the charging station and the required power of each charging terminal and non-charging load in the charging station includes: obtaining the sum of the powers to be allocated of the charging terminals corresponding to the three phase lines in the charging station, wherein the sum of the powers to be allocated of the charging terminals corresponding to the three phase lines in the charging station is calculated through current detection signals detected by the current detection module in the charging terminal; calculating the ratio between the sums of the powers to be allocated of the charging terminals corresponding to the three phase lines in the charging station to obtain the power balance parameters of the charging station; receiving the required power sent by each charging terminal in the charging station, wherein the required power of the charging terminal is determined based on the required power of the load connected to the charging terminal, or based on the rated power of the charging terminal.

[0025] Optionally, based on the power balance parameters of the charging station and the required power of each of the charging terminals and non-charging loads, the target phase line corresponding to each charging terminal is determined, and the power to be allocated of each charging terminal in the charging station is calculated, including: allocating two target phase lines to each charging terminal in the charging station; based on the allocation results of the target phase lines of each charging terminal, calculating the sum of the required power allocated on the three phase lines in the charging station, and judging whether the sum of the required power of all loads in the charging station on the three phase lines meets a preset condition; if the preset condition is met, calculating the power to be allocated of each charging terminal in the charging station based on the allocation results of the target phase lines of each charging terminal.

[0026] Optionally, the method also includes: when it is calculated that the sum of the power requirements of all loads in the charging station on the three phase lines cannot meet the preset conditions, reallocating two target phase lines to each charging terminal; based on the reallocated target phase lines of each charging terminal, calculating the sum of the power requirements allocated on the three phase lines in the charging station until the sum of the power requirements of all loads in the charging station on the three phase lines meets the preset conditions.

[0027] Optionally, based on the power balance parameters of the charging station and the required power of each of the charging terminals and non-charging loads, determining the target phase line corresponding to each charging terminal, and calculating the power to be allocated of each charging terminal in the charging station, includes: calculating the sum of the required power of each charging terminal on three phase lines under three phase line allocation modes based on the required power of each charging terminal in the charging station; determining the target phase line corresponding to each charging terminal based on whether the sum of the required power of all loads in the charging station on three phase lines under three phase line allocation modes meets preset conditions; and calculating the power to be allocated of each charging terminal in the charging station based on the allocation result of the target phase line of each charging terminal.

[0028] Optionally, the calculation of the power to be allocated of each charging terminal in the charging station includes: determining the power allocation weight of each charging terminal in the charging station, and based on the power allocation weight of each charging terminal, performing weighted allocation of the power to be allocated of the charging station to obtain the power to be allocated of each charging terminal; or, according to the number of charging terminals in the charging station, evenly allocating the power to be allocated of the charging station to obtain the power to be allocated of each charging terminal.

[0029] Optionally, determining the power allocation weight of each charging terminal in the charging station includes: determining the power allocation weight of each charging terminal based on the ratio of the required power of each charging terminal on the same phase line to the sum of the required power of each charging terminal in the phase line; or determining the power allocation weight of each charging terminal based on the power setting parameters and / or charging priority of each charging terminal.

[0030] Optionally, the calculation of the power to be allocated of each charging terminal in the charging station further includes: calculating the power to be allocated corresponding to two phase lines connected to each charging terminal in the charging station, and using the power to be allocated with a smaller value among the powers to be allocated corresponding to the two phase lines connected to the charging terminal as a reference standard for the power to be allocated of the charging terminal; and / or obtaining the actual charging power of each charging terminal in the charging station, and when the actual charging power of the charging terminal is less than the power to be allocated of the charging terminal, setting the actual charging power of the charging terminal as the power to be allocated of the charging terminal.

[0031] Optionally, the calculation of the power to be allocated of each charging terminal in the charging station also includes: calculating the power to be allocated of each charging terminal in the charging station so that the sum of the power to be allocated of all loads connected to the same phase line in the charging station is less than the power to be allocated corresponding to the phase line, and the sum of the power to be allocated of all loads in the charging station is less than the power to be allocated corresponding to the charging station.

[0032] Optionally, the method further includes: replacing the power balance parameter with a current balance parameter, replacing the required power with a required current, replacing the power to be allocated with a current to be allocated, and generating a scheduling instruction.

[0033] According to another aspect of the present application, a storage medium is provided, on which a computer program is stored, and when the program is executed by a processor, the above-mentioned charging control method is implemented.

[0034] According to another aspect of the present application, a computer device is provided, including a storage medium, a processor, and a computer program stored on the storage medium and executable on the processor, wherein the processor implements the above-mentioned charging control method when executing the program.

[0035] By means of the above technical solution, a charging terminal, a charging control method, a storage medium and a computer device provided in the embodiment of the present application, by setting a switch component and a charging controller inside the charging terminal, and setting a detection device and a load balancing controller in the charging station where the charging terminal is located, the current detection result output by the detection device, the dispatching instruction generated by the load balancing controller with the real-time total current / power value on the three phase lines being equal or nearly equal as the goal, and the switch device inside the switch component, the phase line connection mode in the charging terminal can be flexibly configured and efficiently switched, thereby realizing the dynamic distribution of load in the charging system and maximizing the use of the power supply capacity of the station, thereby improving the safety of the charging system and the utilization rate of electric energy. In addition, the above charging terminal does not need to be grouped for power distribution during installation, and does not need to be set up for personnel guidance during use. It is easy to detect the maintenance point during maintenance, so that the complexity of configuration, use and maintenance of the charging terminal can be effectively reduced, thereby reducing the required labor cost.

[0036] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0038] Figure 1 A schematic diagram of the structure of a charging terminal and a charging station provided by the prior art is shown;

[0039] Figure 2 A schematic diagram of the structure of a charging terminal and a charging station provided in an embodiment of the present application is shown;

[0040] Figure 3 A schematic diagram of the structure of a switch assembly provided in an embodiment of the present application is shown;

[0041] Figure 4 A schematic diagram of the structure of another switch assembly provided in an embodiment of the present application is shown;

[0042] Figure 5 A schematic diagram of the structure of another switch assembly provided in an embodiment of the present application is shown;

[0043] Figure 6 A schematic diagram of a topological structure of a charging terminal provided in an embodiment of the present application is shown;

[0044] Figure 7 A schematic diagram of the topological structure of another charging terminal provided in an embodiment of the present application is shown;

[0045] Figure 8 A schematic diagram of a topological structure of another charging terminal provided in an embodiment of the present application is shown;

[0046] Fig. 9 A schematic diagram of the internal structure of a charging terminal provided in an embodiment of the present application is shown;

[0047] Fig.10 A flow chart of a charging control method provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0048] The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0049] At present, charging stations with dozens or even hundreds of charging terminals need to limit the total current in the charging station for safety reasons, so that the total current in the entire charging station does not exceed a certain set threshold. If the set threshold is exceeded, the pre-installed electrical safety equipment (such as fuses, etc.) will interrupt the power supply in time. For some charging terminals that use two-phase lines for power supply, any two of the three phases in the power grid can be selected for power supply. In order to maximize the power supply capacity of the charging station, the load in the charging station should be evenly distributed on the three phases.

[0050] like Figure 1 As shown, a relatively simple connection method is to randomly select a pair of phase lines for the charging terminals in the charging station so that the number of charging terminals connected to each phase line is in a relatively balanced state. The characteristic of this circuit connection method is that the connected phase line is directly connected to the output end. The phase lines connected to each charging terminal are determined after the construction of the charging station is completed and cannot be easily changed. When multiple loads are charged in the charging station at the same time, since the phase lines connected to the charging terminals are random, each phase line can naturally be in a load-balanced state. In addition, the operator in the charging station can also guide the load to charge at the appropriate charging terminal according to the current load conditions of each phase line.

[0051] In order to ensure randomness, the above connection method usually requires planning in advance the phase lines used by each connected charging terminal. Therefore, the wiring is more complicated during the station construction phase. In addition, when a charging terminal in the station fails, it is difficult for maintenance workers to locate the faulty line in the first place without a line diagram of the station. Based on this, under the current circuit connection method, the station cannot cope with certain extreme situations when achieving load balancing, such as when all charging vehicles are concentrated on charging terminals connected to two specific phase lines.

[0052] In view of the above problems, in one embodiment, Figure 2 As shown, a charging terminal 10 is provided, wherein a switch assembly 11 and a charging controller 12 are arranged inside the charging terminal 10, wherein the switch assembly 11 includes a plurality of switch devices, and a detection device 20 and a load balancing controller 30 are arranged in the charging station where the charging terminal 10 is located. Among them, the input end of the detection device 20 is connected to the grid side of the three phase lines, the output end of the detection device 20 is connected to each charging terminal 10 in the charging station, the signal output end of the detection device 20 is connected to the load balancing controller 30, and the load balancing controller 30 is connected to the charging controller 12 of each charging terminal 10 in the charging station. For each charging terminal 10, three input ends and two output ends are included, wherein the switch assembly 11 is connected between the input end and the output end of the charging terminal 10, and the control end of the switch assembly 11 is connected to the charging controller 12. In this embodiment, the detection device 20 can be used to detect the current detection signals of the three phase lines in the charging station, and the load balancing controller 30 can be used to generate a scheduling instruction based on the current detection signal, wherein the method for generating the scheduling instruction aims to make the real-time total current / power values ​​on the three phase lines equal or nearly equal. Furthermore, the charging controller 12 inside the charging terminal 10 can be used to generate a switch control instruction based on the scheduling instruction, and the switch component 11 inside the charging terminal 10 can be used to control the closing of two switch devices in the switch component based on the switch control instruction, so that the load to be charged is connected to two of the three phase lines, and the charging controller 12 can also be used to generate a current / power adjustment instruction based on the scheduling instruction, so that the charging terminal charges the two-phase line load according to the calculated and allocated current or power. The means of adjusting the power can be to adjust the load current, and the voltage remains basically stable and is not adjusted.

[0053] Specifically, a switch component 11 and a charging controller 12 are provided inside the charging terminal 10, and a detection device 20 and a load balancing controller 30 are provided at the charging station where the charging terminal 10 is located. Among them, inside the charging terminal 10, the three-phase five-wire of the power grid can be connected to the load through the switch component 11, and the switch component 11 can connect two of the three phase lines to the load under the control of the charging controller 12, so as to charge the load. In this embodiment, the charging controller 12 is also called ACM (AC Charging Control Module), which can be used to communicate with the load balancing controller 30 in addition to receiving scheduling instructions to generate switch control instructions and current / power adjustment instructions, and can also be used for control guidance, charging control, safety protection and other functions. Further, outside the charging terminal 10, the charging controller 12 can be connected to the load balancing controller 30 by wire or wireless means, and the load balancing controller 30 is connected to the detection device 20 set between the power grid side of the three phase lines and each charging terminal 10. Among them, the load balancing controller 30 can generate a scheduling instruction based on the current detection signal output by the detection device 20, and the method of generating the scheduling instruction aims to make the real-time total current / power value on the three phase lines equal or nearly equal. Then, the scheduling instruction is sent to the charging controller 12 inside each charging terminal 10, so that the charging controller 12 can generate a switch control instruction through the scheduling instruction after the charging terminal 10 is connected to the load, and control the switch device in the switch assembly 11 to close, so as to charge the load. Furthermore, the charging controller 12 can also generate a current / power adjustment instruction through the scheduling instruction, so as to charge the load with the current / power calculated and allocated by the load balancing controller. In this embodiment, the detection device 20 can measure the positive and negative currents and voltages, so as to obtain the power value for load balancing control.

[0054] In this embodiment, the load balancing controller 30 can ensure that the total current of each phase line in the charging station does not exceed the current threshold set by the charging station, and by switching the connection mode of the switch assembly 11 of each charging terminal 10, it can ensure that the load in the charging station, including non-charging load and charging load, can be evenly distributed on the three phase lines. The charging load can be an electric vehicle, and the non-charging load can be the air conditioning system, office lighting system, etc. of the station. The charging load and the non-charging load together constitute all the electrical equipment in the charging station. When charging is performed, the current / power of the charging load is the same as the current / power of the charging terminal connected to it. In this application, for the sake of convenience of expression, various currents / powers of the charging load and various currents / powers of the charging terminal will be used at different locations to describe the scheme. In this embodiment, the method for the load balancing controller 30 to generate a scheduling instruction based on the current detection signal of the three phase lines in the charging station can be implemented by a variety of algorithms, wherein the method for generating a scheduling instruction is to make the real-time total current / power value on the three phase lines equal or nearly equal. Furthermore, the load balancing controller 30 can be arranged in at least one location inside the charging terminal 10, inside the charging station, and in the cloud server. The load balancing controller 30 can be one or more, which is not specifically limited in this embodiment. The above charging terminal can solve the problems of unbalanced load in the charging station and high installation and maintenance costs of the charging terminal.

[0055] The above embodiment, by setting a switch assembly and a charging controller inside the charging terminal, and setting a detection device and a load balancing controller in the charging station where the charging terminal is located, can flexibly configure and efficiently switch the phase line connection mode in the charging terminal through the current detection result output by the detection device, the dispatching instruction generated by the load balancing controller with the real-time total current / power value on the three phase lines being equal or nearly equal, and the switch device inside the switch assembly, so as to realize the dynamic distribution of load in the charging system and maximize the use of the power supply capacity of the station, thereby improving the safety of the charging system and the utilization rate of electric energy. In addition, the above charging terminal does not need to be grouped for power distribution during installation, and does not need to be set up for personnel guidance during use. It is easy to detect the maintenance point during maintenance, so it can effectively reduce the complexity of configuration, use and maintenance of the charging terminal, thereby reducing the required labor cost.

[0056] In one embodiment, Figure 2As shown, the switch assembly 11 includes three input terminals and two output terminals, and the switch assembly 11 includes at least four switch devices, wherein the three input terminals of the switch assembly 11 are connected to the three phase lines through the detection device 20. Inside the switch assembly 11, the two output terminals of the switch assembly are respectively connected to the three input terminals of the switch assembly through a plurality of switch devices, wherein each switch device is connected in series between an input terminal and an output terminal of the switch assembly, and at least one of the three input terminals of the switch assembly is respectively connected to the two output terminals of the switch assembly through two switch devices. In the same charging period, the two switch devices respectively connected to the two output terminals of the switch assembly are in a closed state, and the two closed switch devices are respectively connected to different input terminals.

[0057] In this embodiment, the switch assembly is provided with three input terminals and two output terminals, wherein the two output terminals of the switch assembly can output three phase line combinations, namely L1 and L2, L1 and L3, and L2 and L3. Based on this combination mode, the switch assembly requires at least four switch devices to realize the corresponding function, and each output terminal needs to be connected with at least two switch devices, and the two switch devices are respectively connected to two different input terminals. Through this connection relationship, it can be ensured that the switch assembly 11 can connect the load to be charged to any two phase lines in the power grid according to actual needs within the same charging period.

[0058] Specifically, the three phase lines output from the detection device 20 can be directly connected to each charging terminal 10 in the charging station, and the switching of different phase lines can be realized through each switch device inside the switch assembly 11, and then the load is charged through two of the three phase lines. Specifically, when a new load (such as an electric car driven by a user) enters the charging station, the user can freely choose any idle charging terminal in the station for charging. At this time, the load balancing controller 30 can plan the phase line currently suitable for output according to the current detection signal detected by the detection device 20 installed between each phase line and each charging terminal 10, and then send a scheduling instruction to the charging controller 12 inside the charging terminal 10 connected to the new load, so that the charging controller 12 can control the on and off of the switch device inside the switch assembly 11, and thereby realize the output of the specified phase line, thereby charging the two-phase line load.

[0059] The above embodiment can realize flexible connection and switching between loads and phase lines during charging by setting at least four switching devices in the switch assembly, thereby effectively improving the utilization rate of power resources. In the scenario where multiple loads are charged simultaneously, by setting a suitable phase line combination for each charging terminal, the problem of single-phase overload can be effectively avoided, thereby ensuring the stable operation of the entire charging station. In addition, the above circuit design simplifies the installation and maintenance process of the charging terminal and reduces the required labor costs.

[0060] In one embodiment, the switch assembly includes four switch devices, wherein two output ends of the switch assembly are connected to two input ends of the switch assembly through two switch devices respectively, each switch device is connected in series between one input end and one output end of the switch assembly, and one of the three input ends of the switch assembly is connected to two output ends of the switch assembly through two switch devices respectively. Figure 3 As shown, the switch assembly includes four switch devices, namely K1, K2, K3 and K4, wherein the first ends of K1 and K2 are connected to the phase line L1 and the phase line L2 respectively, the second ends of K1 and K2 are connected together and connected to one output end of the switch assembly, the first ends of K3 and K4 are connected to the phase line L2 and the phase line L3 respectively, and the second ends of K3 and K4 are connected together and connected to another output end of the switch assembly. Through this connection method, the number of switch devices can be saved and dual-phase line switching can be achieved.

[0061] Specifically, Figure 3 As shown, it is assumed that there are three electric vehicles (i.e., loads) in the station that are about to start charging. The three vehicles are named vehicle 1, vehicle 2, and vehicle 3, and the charging terminals they use are named terminal 1, terminal 2, and terminal 3 respectively. When vehicle 1 is charging, terminal 1 closes switch devices K1 and K3 under the control of the load balancing controller and the charging controller. At this time, the output end of terminal 1 is connected to the phase lines L1 and L2; when vehicle 2 is charging, terminal 2 closes switch devices K1 and K4 under the control of the load balancing controller and the charging controller. At this time, the output end of pile 2 is connected to the phase lines L1 and L3; when vehicle 3 is charging, terminal 3 closes switch devices K2 and K4 under the control of the load balancing controller and the charging controller. At this time, the output end of terminal 3 is connected to the phase lines L2 and L3. Through the above method, dynamic adjustment of load can be achieved, the utilization rate of power resources can be improved, and the required labor costs can be saved.

[0062] The switch assembly provided in this embodiment can reduce the number of switch components, save circuit design costs, and reduce the complexity of the charging terminal. In addition, the switch assembly provides a flexible phase line switching method, which allows the load to select two phase lines from the three phase lines for connection according to the grid state and load requirements, thereby optimizing power distribution and improving power supply efficiency and stability.

[0063] In one embodiment, the switch assembly includes five switch devices, wherein one output end of the switch assembly is connected to two input ends of the switch assembly through two switch devices, and another output end of the switch assembly is connected to three input ends of the switch assembly through three switch devices, wherein each switch device is connected in series between one input end and one output end of the switch assembly. Figure 4 As shown, the switch assembly includes five switch devices, namely K1, K2, K3, K4 and K5, wherein the first ends of K1, K2 and K3 are connected to the phase lines L1, L2 and L3 respectively, the second ends of K1, K2 and K3 are connected together and connected to one output end of the switch assembly, the first ends of K4 and K5 are connected to the phase line L2 and the phase line L3 respectively, and the second ends of K4 and K5 are connected together and connected to the other output end of the switch assembly. Through this connection mode, redundancy of the switch devices can be achieved, and dual-phase line switching can be achieved.

[0064] The above embodiment can provide a backup path when a certain switch device fails by designing redundant switch devices, thereby ensuring the stable operation of the charging terminal. In addition, the above switch assembly provides a flexible phase line switching method, which allows the load to select two phase lines from the three phase lines for connection according to the grid status and load requirements, thereby optimizing power distribution and improving the efficiency and stability of power supply.

[0065] In one embodiment, the switch assembly includes six switch devices, wherein two output terminals of the switch assembly are connected to three input terminals of the switch assembly through three switch devices respectively, and each switch device is connected in series between an input terminal and an output terminal of the switch assembly. Figure 5 As shown, the switch assembly includes six switch devices, namely K1, K2, K3, K4, K5 and K6, wherein the first ends of K1, K2 and K3 are connected to the phase lines L1, L2 and L3 respectively, the second ends of K1, K2 and K3 are connected together and connected to one output end of the switch assembly, the first ends of K4, K5 and K6 are connected to the phase lines L1, L2 and L3 respectively, and the second ends of K4, K5 and K6 are connected together and connected to another output end of the switch assembly. Through this connection method, redundancy of the switch devices can be achieved, so that dual-phase line switching can be achieved through a variety of switch combinations, thereby improving the reliability and flexibility of the switch assembly.

[0066] The above embodiment can provide a backup path when a certain switch device fails by designing redundant switch devices, thereby ensuring the stable operation of the charging terminal. In addition, the above switch assembly provides a flexible phase line switching method, which allows the load to select two phase lines from the three phase lines for connection according to the grid status and load requirements, thereby optimizing power distribution and improving the efficiency and stability of power supply.

[0067] In one embodiment, the scheduling instructions generated by the load balancing controller also include current regulation instructions and / or power regulation instructions. Among them, the charging controller can be used to charge the load to be charged based on the current value indicated in the current regulation instruction, and / or, to charge the load to be charged based on the power value indicated in the power regulation instruction. In this embodiment, the charging controller can be used to generate a current / power regulation instruction based on the scheduling instruction so that the charging terminal charges the two-phase line load according to the calculated and allocated current or power. The means of regulating power can be to adjust the load current, and the voltage remains basically stable and is not adjusted.

[0068] In one embodiment, the specific working process of the load balancing controller is as follows: in response to detecting that any load in the charging station changes its power consumption state, the power balance parameters of the charging station and the required power of each charging terminal and non-charging load in the charging station are obtained; then, based on the power balance parameters of the charging station and the required power of each charging terminal and non-charging load, the target phase line corresponding to each charging terminal is determined, and the power to be allocated of each charging terminal in the charging station is calculated, wherein the target phase line is two of the three phase lines on the grid side; finally, based on the target phase line corresponding to each charging terminal and the power to be allocated of each charging terminal in the charging station, a scheduling instruction is generated, wherein the method for generating the scheduling instruction aims to make the real-time total current / power values ​​on the three phase lines equal or nearly equal.

[0069] In one embodiment, the load balancing controller can replace the power balance parameters in the above embodiment with current balance parameters, replace the required power with the required current, and replace the power to be allocated with the current to be allocated to generate a scheduling instruction. In this embodiment, since the voltage supply of the charging station is usually maintained at a relatively stable level, the ratio of the current value to the power value is fixed, and the current value can be used instead of the power value to complete the charging control, analysis and calculation in this application. For example, the power balance parameter is replaced by the current balance parameter, the required current replaces the required power, the current to be allocated replaces the power to be allocated, the charging current replaces the charging power, the maximum current replaces the maximum power, the current replaces the power, and so on. In the above manner, the calculation process and difficulty of each link can be simplified, thereby improving the efficiency of generating scheduling instructions.

[0070] Specifically, the load balancing controller can control the phase line connection mode of each charging terminal in the charging station in real time. First, when the load balancing controller detects that any load in the charging station changes the power consumption state, the power balance parameter of the charging station and the required power of each charging terminal and non-charging load in the charging station can be obtained, wherein the power balance parameter of the charging station is the ratio of the sum of the power to be allocated for charging corresponding to each phase line of the charging station when the required power of all loads on the phase line is greater than the power to be allocated of the phase line. This parameter can be used to characterize the power allocation conditions of the charging terminals of the three phase lines in the charging station under the full load state. The required power of each charging terminal in the charging station is the power required by each charging terminal in the charging station to complete the charging task. Then, the load balancing controller can determine the target phase line to which each charging terminal should be connected based on the power balance parameter of the charging station and the required power of each charging terminal and non-charging load. Among them, the target phase line refers to two of the three phase lines provided by the power grid side. In this embodiment, the load balancing controller can select two suitable phase lines to allocate power according to the current power balance situation and charging demand. At the same time, the load balancing controller can also calculate the power to be allocated for each charging terminal in the charging station, that is, the power value that each charging terminal should receive under the premise of maintaining power balance on the three phase lines. Finally, based on the target phase lines corresponding to each charging terminal and the power to be allocated for each charging terminal in the charging station, a dispatch instruction is generated with the goal of making the real-time total current / power values ​​on the three phase lines equal or nearly equal, and the dispatch instruction is sent to each charging terminal.

[0071] This embodiment can dynamically adjust the power distribution of charging terminals by real-time monitoring the charging status and charging demand of each charging terminal in the charging station, as well as the power balance of the charging station, so as to ensure the efficiency and safety of the charging process. In addition, this embodiment can achieve the reasonable distribution and utilization of power resources on the grid side by selecting the target phase line and calculating the power to be distributed of each charging terminal, thereby avoiding problems such as grid fluctuations or equipment damage caused by power imbalance.

[0072] In one embodiment, the sum of the powers to be allocated of all loads connected to the same phase line in the charging station is less than the power to be allocated corresponding to the phase line, and the sum of the powers to be allocated of all loads in the charging station is less than the power to be allocated corresponding to the charging station.

[0073] Specifically, when allocating power to each charging terminal, the carrying capacity of each phase line needs to be considered. For all loads connected to the same phase line, the sum of the power to be allocated should be less than the corresponding power to be allocated of the phase line, that is, the total power required by all loads on each phase line cannot exceed the maximum power that the phase line can provide, to prevent overload and safety hazards. In addition, the sum of the power to be allocated of all loads cannot exceed the corresponding power to be allocated of the charging station, so as to prevent the total power of the entire charging station from exceeding the maximum power that the power grid or transformer can provide, thereby ensuring the stable operation of the charging system.

[0074] The above embodiments can ensure the power balance of each phase line in the charging station and the entire charging station, improve the safety and stability of the charging process, optimize the utilization of power resources, avoid overload and power waste, help reduce the load pressure of the power grid, and improve energy utilization efficiency.

[0075] In one embodiment, a communication controller is further provided in the charging terminal, wherein the communication controller is connected to the charging controller, and the charging controller can be communicatively connected to the load balancing controller via the communication controller.

[0076] Specifically, a communication controller is provided inside the charging terminal, wherein the communication controller is connected to the charging controller, and can establish a stable communication connection with the load balancing controller in the charging station through a specific communication protocol and interface. In this embodiment, the communication controller refers to a hardware or software module specifically used for data transmission, reception and processing, which can support a variety of communication methods, such as Ethernet, CAN bus, wireless communication, etc., to adapt to different application scenarios and communication requirements. By working in collaboration with the charging controller, the communication controller can upload key data such as the charging status, fault information, and required power of the charging terminal to the load balancing controller in real time. At the same time, it can also receive instructions from the load balancing controller, such as adjusting the charging power, starting or stopping charging, etc., to ensure that the charging process can proceed in a predetermined manner.

[0077] This embodiment can enhance the communication capability of the charging terminal by setting a communication controller inside the charging terminal, so that the charging terminal can communicate with the load balancing controller in real time, thereby achieving accurate control of the charging process, thereby improving the safety and reliability of the charging process.

[0078] In one embodiment, the load balancing controller can be set in at least one of the charging terminal, the charging station, and the cloud server. When the load balancing controller is set inside the charging terminal, the charging controller in the charging terminal can be used as a load balancing controller. At this time, the load balancing controller can communicate with the communication controllers of other charging terminals in the charging station through the communication controller. In this scenario, Figure 6 As shown, the charging terminal equipped with a load balancing controller can be called a main charging terminal, and other charging terminals connected to the load balancing controller can be called sub-charging terminals. The load balancing controller can provide scheduling instructions for the main charging terminal and each sub-charging terminal in the charging station. When the load balancing controller is set locally in the charging station, the load balancing controller can communicate with the communication controllers of each charging terminal in the charging station through the communication module. In this scenario, Figure 7 As shown, the charging station may not have a main charging terminal, and all charging terminals connected to the load balancing controller are sub-charging terminals. In this case, the load balancing controller can provide scheduling instructions for each sub-charging terminal in the charging station. Furthermore, when the load balancing controller is set up in the cloud server, the load balancing controller can communicate with the communication controller of each charging terminal in the charging station through the network. In this scenario, the cloud controller can directly communicate with each charging terminal in the charging station through the network, or it can be as follows Figure 8 As shown, it is connected to the main charging terminal in the charging station through communication, and then connected to each sub-charging terminal in the charging station through the main charging terminal, so as to realize the release of scheduling instructions.

[0079] Specifically, the load balancing controller can be set inside the charging terminal, the charging station or the cloud server according to actual needs, or it can be set at multiple locations in these locations. When the load balancing controller is set inside the charging terminal, the charging controller in the charging terminal can also have the function of a load balancing controller. At this time, the charging controller can be used to control the switch state of each switch device in the switch assembly, as well as the current, voltage and other parameters during the charging process. At the same time, a communication connection can be established with the communication controller of other charging terminals through the communication controller. In this way, the main charging terminal (i.e., the charging terminal with a built-in load balancing controller) can obtain information such as the charging state and required power of other sub-charging terminals (i.e., other charging terminals connected to the load balancing controller) in real time. Based on this information, the load balancing controller in the main charging terminal can calculate the power to be allocated for each charging terminal (including the main charging terminal and the sub-charging terminal), and generate corresponding scheduling instructions with the goal of equal or nearly equal real-time total current / power values ​​on the three phase lines, and then send the scheduling instructions to each sub-charging terminal through the communication controller, thereby achieving power balance in the charging station.

[0080] Furthermore, when the load balancing controller is set locally in the charging station, a stable communication connection can be established with the communication controller of each charging terminal in the charging station through the built-in communication module. In this way, the load balancing controller can obtain the charging status, required power and other information of each charging terminal in real time, and calculate the power to be allocated for each charging terminal based on this information, and then generate and issue scheduling instructions to each charging terminal. In this scenario, it is not necessary to set up a specific main charging terminal in the charging station, and all charging terminals connected to the load balancing controller can be regarded as sub-charging terminals, and these sub-charging terminals can be controlled by the load balancing controller together. Further, when the load balancing controller is set on the cloud server, it can communicate with the communication controller of each charging terminal in the charging station through the network. In this way, the load balancing controller can cross geographical restrictions and centrally manage multiple charging stations. In this embodiment, the cloud controller can communicate directly with each charging terminal in the charging station, or it can first establish a connection with a main charging terminal in the charging station, and then communicate with other sub-charging terminals in the charging station through the main charging terminal.

[0081] This embodiment can improve the charging efficiency of the charging station by deploying the load balancing controller at multiple locations. On the one hand, the load balancing controller can respond to changes in charging demand in the charging station more quickly, reduce the imbalance of power distribution, and improve energy utilization efficiency. On the other hand, by integrating the load balancing controller inside the charging terminal, the investment in additional hardware equipment can be reduced, reducing costs.

[0082] In one embodiment, Fig. 9 As shown, a current detection module 13 is also provided inside the charging terminal 10. The current detection module 13 is connected to the charging controller 12, and the module can be used to detect the actual charging power of the charging terminal and send the detected actual charging power to the charging controller 12.

[0083] Specifically, the charging terminal 10 is also provided with a current detection module 13, which can be used to monitor the current size during the charging process in real time, and calculate the actual charging power of the charging terminal based on the detected current value and the known voltage value, and send the actual charging power to the charging controller 12. In this embodiment, the current detection module 13 can be connected to the charging controller 12 through a specific interface or bus.

[0084] This embodiment provides a current detection module inside the charging terminal, so as to monitor and feedback the actual charging power of the charging terminal in real time, thereby facilitating accurate control of the charging process, thereby improving the safety and reliability of charging control.

[0085] In the above-mentioned embodiments, the method for the load balancing controller to generate scheduling instructions based on the current detection signals of the three phase lines in the charging station can be implemented by a variety of algorithms, and the goal is to achieve equal or nearly equal real-time total current / power values ​​on the three phase lines, that is, the current / power value ratio of the three phase lines is equal to or close to 1:1:1, wherein the load of each phase line includes both charging load and non-charging load.

[0086] In one embodiment, Fig.10 As shown, a charging control method is provided, which is described by taking the method applied to a load balancing controller in a charging terminal as an example, and includes the following steps:

[0087] Step 101 , in response to detecting that any load in a charging station changes its power usage state, obtaining a power balance parameter of the charging station and power requirements of each charging terminal and non-charging load in the charging station.

[0088] Step 102, based on the power balance parameters of the charging station and the required power of each charging terminal and non-charging load, determine the target phase line corresponding to each charging terminal, and calculate the power to be allocated for each charging terminal in the charging station, where the target phase line is two of the three phase lines on the grid side.

[0089] Step 103: Generate a dispatch instruction based on the target phase line corresponding to each charging terminal and the power to be allocated of each charging terminal in the charging station.

[0090] Specifically, the load balancing controller can control the phase line connection mode of each charging terminal in the charging station in real time. First, when the load balancing controller detects that any load in the charging station changes its power consumption state, it can obtain the power balance parameters of the charging station and the required power of each charging terminal and non-charging load in the charging station. Among them, the change of power consumption state of the load in the charging station includes the change of power consumption state of the charging load and the non-charging load. For example, a new charging terminal drives a charging load (such as an electric car) into a waiting state, or a charging terminal drives a charging load to exit the charging state, or a non-charging load (such as an air conditioner) starts or ends power consumption, which will trigger the load balancing controller to enter the above steps 101, 102, and 103 to start a new round of charging control and power redistribution. The power balance parameter of the charging station is the ratio of the sum of the power to be allocated for charging corresponding to each phase line of the charging station when the demand power of all loads on the phase line is greater than the power to be allocated of the phase line. This parameter can be used to characterize the power allocation conditions of the charging terminals of the three phase lines in the charging station under full load. The demand power of each charging terminal in the charging station is the power required by each charging terminal in the charging station to complete the charging task. Then, the load balancing controller can determine the target phase line to which each charging terminal should be connected based on the power balance parameter of the charging station and the demand power of each charging terminal and non-charging load. Among them, the target phase line refers to two of the three phase lines provided by the power grid side. In this embodiment, the load balancing controller can select two suitable phase lines to allocate power according to the current power balance and charging demand. At the same time, the load balancing controller can also calculate the power to be allocated of each charging terminal in the charging station, that is, the power value that each charging terminal should receive under the premise of maintaining power balance on the three phase lines. Finally, based on the target phase lines corresponding to each charging terminal and the power to be allocated of each charging terminal in the charging station, a scheduling instruction is generated and sent to each charging terminal with the goal of making the real-time total current / power values ​​on the three phase lines equal or nearly equal.

[0091] For example, if the power demand of all loads on a phase line is greater than the power to be allocated on the phase line and the load is balanced, the phase line will be fully loaded. Assuming that the power to be allocated for charging on the three phase lines is Pmax(L1), Pmax(L2) and Pmax(L3), the charging power demand on the three phase lines is Preq(L1), Preq(L2) and Preq(L3), respectively. The power balance parameter is Pmax(L1):Pmax(L2):Pmax(L3)=Preq(L1):Preq(L2):Preq(L3); if the power demand of all loads on a phase line is less than the power to be allocated on the phase line and the load is balanced, the power demand of all loads is met, and the sum of the power demand of the charging load and the non-charging load of the three phase lines is equal or nearly equal, that is, Preq(L1)+Pncharge(L1)≈

[0092] Preq(L2)+Pncharge(L2)≈Preq(L3)+Pncharge(L3). When a new load requests charging, the power demand of the load on the two phase lines is Plr(1) and Plr(2). At this time, the phase line connection of each load on each phase line is readjusted. If the power demand of all loads is greater than the power to be allocated on the phase line, the ratio of the readjusted charging power demand Preq'(L1), Preq'(L2) and Preq'(L3) on the three phase lines is equal to or closest to the power balance parameter, Pmax(L1):Pmax(L2):Pmax(L3)≈Preq'(L1):Preq'(L2):Preq'(L3); If the power demand of all loads is less than the power to be allocated on the phase line, the sum of the readjusted charging power demand Preq'(L1), Preq'(L2) and Preq'(L3) on the three phase lines and the non-charging power demand is equal or nearly equal, that is, Preq'(L1)+Pncharge(L1)≈

[0093] Preq'(L2)+Pncharge(L2)≈Preq'(L3)+Pncharge(L3). If the power demand of all loads is greater than the power to be allocated of the phase line, calculate the power to be allocated of any pile 1 on the phase lines L1, L2, and L3: Palloc(pile 1, L1)=Pmax(L1)*Preq'(pile 1, L1) / Preq'(L1), so that the power to be allocated on the three phase lines meets or approaches the power balance parameter, Pmax(L1):Pmax(L2):Pmax(L3)≈Palloc(L1):Palloc(L2):Palloc(L3); If the power demand of all loads is less than the power to be allocated of the phase line, the power demand of all loads on the three lines can also be met, that is, Palloc(pile 1, L)=Preq'(pile 1, L).

[0094] Among them, re-adjusting the phase line connection of each load on each phase line includes all adjustments to all loads. Take the case where the power demand of all loads before adjustment is less than the power to be allocated of the phase line as an example: in one case, the sum of the power demand of the three phase lines is inconsistent before the new load requests charging, and load balancing is not achieved. After calculation, it is found that the gap is just filled after the power demand of the new load is added, and the total power demand of the three phase lines is close to equal. In this case, it is only necessary to switch the charging terminal connected to the new load to the two phase lines with power gaps, without adjusting the phase lines connected to other charging terminals, and without adjusting the power of other loads. If the charging terminal connected to the new load cannot fill the gap to achieve load balancing after switching to the two phase lines with power gaps, after analysis and calculation, load balancing can be achieved by adjusting the phase lines of the charged loads without adjusting the power of the charged loads, that is, the demands of all loads can still be met after the new loads are added. In this case, it is only necessary to adjust the phase lines connected to multiple charging terminals, and there is no need to adjust the power of other loads.

[0095] If the new load cannot fill the gap and achieve load balancing after being added to the two phase lines with power gaps, and load balancing cannot be achieved after analyzing and calculating and adjusting the phase lines of all loads, then it is necessary to adjust the power to be allocated of some or all loads to achieve load balancing, that is, it is necessary to calculate the power to be allocated of each charging terminal after adjusting the phase line connection, and generate a scheduling instruction based on the phase line adjustment and the power to be allocated. If the power of all loads on the phase line at this time, including the power of non-charging loads and the required power of charging loads, exceeds the maximum power allowed by the phase line, then Pmax(L1):Pmax(L2):Pmax(L3)≈Palloc(L1):Palloc(L2):Palloc(L3) is the target of the calculation result, because at this time all three phase lines will be fully loaded, so the power of all their loads will be the same, that is, load balancing is achieved; if the power of all loads on the phase line at this time, including the power of non-charging loads and the required power of charging loads, does not reach the maximum power allowed by the phase line, then try not to sacrifice the required power of the charging load, that is, the required power is close to the power to be allocated. When calculating the power to be distributed, the load power to be distributed can be adjusted less to a certain extent to be close to the above equation, and the degree of closeness is within a preset range. Regardless of whether the phase line needs to be adjusted and the load power needs to be adjusted in the above situations, it is necessary to analyze the phase line switching of all loads and calculate the power of all loads to draw a conclusion on whether adjustment is needed.

[0096] This embodiment can dynamically adjust the power distribution of charging terminals by real-time monitoring the charging status and charging demand of each charging terminal in the charging station, as well as the power balance of the charging station, so as to ensure the efficiency and safety of the charging process. In addition, this embodiment can achieve the reasonable distribution and utilization of power resources on the grid side by selecting the target phase line and calculating the power to be distributed of each charging terminal, thereby avoiding problems such as grid fluctuations or equipment damage caused by power imbalance.

[0097] In one embodiment, the method of obtaining the power balance parameter and the required power of each charging terminal and non-charging load in step 101 can be implemented in the following manner: Under the load balancing state, the sum of the power to be allocated of the charging terminals corresponding to the three phase lines in the charging station is obtained, wherein the sum of the power to be allocated of the charging terminals corresponding to the three phase lines in the charging station is calculated by the current detection signal detected by the current detection module in the charging terminal, and then the ratio between the sum of the power to be allocated of the charging terminals corresponding to the three phase lines in the charging station is calculated to obtain the power balance parameter for charging of the charging station. Then, the required power sent by each charging terminal in the charging station is received, wherein the required power of the charging terminal is determined based on the required power of the load connected to the charging terminal, or based on the rated power of the charging terminal. In addition, there are many ways to obtain the required power of the non-charging load, for example, a current detection module can be installed on the non-charging load to measure the real-time non-charging current, or the total current value measured by the detection device can be subtracted from the charging current in the charging to obtain the real-time non-charging current, or the control method can be used to control the total current of the phase line to obtain the non-charging current in real time.

[0098] In this embodiment, the sum of the power to be allocated of the charging terminals corresponding to the three phase lines in the charging station is the total power available for charging of the three phase lines. For a charging station that only includes charging equipment, the power to be allocated of the three phase lines remains unchanged during the charging operation of the station, and the ratio between the power to be allocated of the three phase lines, that is, the power balance parameter is 1:1:1. For charging stations that include other types of electrical equipment in addition to charging equipment, because the power of other types of electrical equipment changes over time, the sum of the power to be allocated of the charging terminals of the three phase lines needs to be calculated by summing up the current detection signals detected by the current detection module in the charging terminal. The sum of the current to be allocated can be multiplied by the voltage to obtain the sum of the power to be allocated. The calculation method for obtaining the power to be allocated is not limited to this.

[0099] Specifically, the load balancing controller can detect the current values ​​flowing through the three phase lines (marked as L1, L2, and L3) on the grid side in real time through the detection device set in the charging station. These current values ​​reflect the total current to be distributed for charging each phase line, and also reflect the non-charging load currently carried by each phase line. Since the voltage supply of the charging station is usually maintained at a relatively stable level, the current value can be regarded as an indirect indicator of power distribution to simplify analysis and calculation. For example, if it is detected that the current to be distributed corresponding to the three phase lines L1, L2, and L3 is 20A, then under the condition of stable voltage, it can be considered that the power to be distributed corresponding to the three phase lines is approximately equal, and the power balance parameter Pmax(L1): Pmax(L2): Pmax(L3) can be calculated by the sum of the power to be distributed of the charging terminal at this time.

[0100] Furthermore, after the power balancing parameters are determined, the load balancing controller can receive the required power sent by each charging terminal in the charging station and calculate the power of the non-charging load. The required power of the charging terminal can be determined in two ways. One is to determine the actual required power based on the load currently connected to the charging terminal (such as the battery status of the electric vehicle), and the other is to preset a required power within a safe range based on the rated power of the charging terminal itself. In actual operation, the charging terminal can determine its own charging power based on the load conditions or preset rules to which it is connected, and then upload the required power to the load balancing controller through a specific communication protocol.

[0101] The method provided in this embodiment can realize accurate calculation of power balance parameters in the charging station and real-time acquisition of power demand of each charging terminal and non-charging load power, thereby facilitating dynamic adjustment of the power of each phase line in the charging station, so as to optimize the overall operating efficiency of the charging station. In addition, the above method can avoid overloading of each phase line, ensuring the safety and stability of the charging process.

[0102] In one embodiment, step 102 can be implemented in the following manner: two target phase lines are allocated to each charging terminal, and based on the allocation results of the target phase lines of each charging terminal, the sum of the required powers allocated on the three phase lines in the charging station is calculated, and it is determined whether the sum of the required powers of all loads in the charging station on the three phase lines meets a preset condition; if the preset condition is met, the power to be allocated for each charging terminal in the charging station is calculated based on the allocation results of the target phase lines of each charging terminal.

[0103] Specifically, the load balancing controller can allocate two target phase lines to each charging terminal according to the required power of each charging terminal and non-charging load. Among them, the target phase line refers to two phase lines selected from the three phase lines provided by the power grid side for powering each charging terminal. The selection of the target phase line can be based on a variety of strategies, including but not limited to selecting a phase line that can withstand the power according to the size of the required power, or allocating according to a preset polling order, random selection and other strategies to ensure load balancing of each phase line. After determining the target phase line of each terminal, the sum of the required power on the three phase lines in the charging station can be further calculated, and it can be determined whether the sum of the required power of all loads on the three phase lines meets the preset conditions. If the sum of the required power on the three phase lines in the charging station can meet the above preset conditions, then based on the allocation results of the target phase lines of each charging terminal, the power to be allocated of each charging terminal in the charging station is calculated to achieve power allocation of the charging station to maintain load balancing between the phase lines.

[0104] The preset condition of the sum of the power requirements of all loads on the three phase lines can be set as follows: if the power requirements of all loads are greater than the power to be allocated on the phase line, the ratio of the re-adjusted charging power requirements Preq'(L1), Preq'(L2) and Preq'(L3) on the three phase lines is equal to or closest to the power balance parameter, Pmax(L1):Pmax(L2):Pmax(L3)≈Preq'(L1):Preq'(L2):Preq'(L3); if the power requirements of all loads are less than the power to be allocated on the phase line, the sum of the re-adjusted charging power requirements Preq'(L1), Preq'(L2) and Preq'(L3) on the three phase lines and the non-charging power requirements is equal or nearly equal, that is, Preq'(L1)+Pncharge(L1)≈Preq'(L2)+Pncharge(L2)≈Preq'(L3)+Pncharge(L3). When one of the above conditions is met, it can be considered that the preset condition is met.

[0105] This embodiment can accurately distribute the power of each phase line in the charging station by allocating a target phase line to each charging terminal and calculating the sum of the required power on the three phase lines after allocating the phase lines. The above method can effectively avoid phase line overload, improve the safety and stability of the charging system, and thus improve the overall operating efficiency of the charging station.

[0106] In one embodiment, the charging control method may further include the following steps: when it is calculated that the sum of the power requirements of all loads in the charging station on the three phase lines cannot meet the preset conditions, two target phase lines are reallocated to each charging terminal. Then, based on the target phase lines reallocated to each charging terminal, the sum of the power requirements allocated to the three phase lines in the charging station is recalculated until the sum of the power requirements of all loads in the charging station on the three phase lines meets the preset conditions.

[0107] Specifically, when the load balancing controller calculates that the sum of the power requirements of all loads on the three phase lines in the charging station cannot meet the preset conditions, two target phase lines can be reallocated for each charging terminal, that is, two phase lines can be reselected as power supply lines for each charging terminal. After reallocating the target phase lines, the load balancing controller can again calculate the sum of the power requirements on the three phase lines in the charging station based on the reallocated target phase lines, and determine whether the sum of the power requirements of all loads on the three phase lines meets the preset conditions. This calculation process is similar to the initial allocation, and aims to find a power allocation scheme that can make the sum of the power requirements of all loads on the three phase lines meet the preset conditions as much as possible. It should be noted that the process of redistribution and calculation may require multiple iterations until the load balancing controller finds a power allocation scheme that can make the sum of the power requirements on the three phase lines meet the preset conditions.

[0108] This embodiment can ensure the accuracy of power distribution at the charging station by reallocating target phase lines to charging terminals when the load is unbalanced and calculating the sum of the required power of the three phase lines, thereby improving the safety and stability of the charging system, avoiding the risk of phase line overload, and improving the overall operating efficiency of the charging station.

[0109] In one embodiment, step 102 can also be implemented by the following method: First, based on the power requirements of each charging terminal and non-charging load in the charging station, the sum of the power requirements of all loads on the three phase lines in the charging station under the three phase line allocation modes for each charging terminal is calculated, and all loads include charging loads and non-charging loads. Then, based on whether the sum of the power requirements of the three phase lines in the charging station under the three phase line allocation modes for each charging terminal meets the preset conditions, the target phase line corresponding to each charging terminal is determined. Finally, based on the allocation results of the target phase lines of each charging terminal, the power to be allocated for each charging terminal in the charging station is calculated.

[0110] Specifically, the load balancing controller can calculate the sum of the power requirements of the three phase lines in the charging station under three different phase line allocation methods based on the power requirements of each charging terminal in the charging station. Among them, the three different phase line allocation methods refer to three situations in which each charging terminal is allocated to a combination of two phase lines, L1 and L2, L1 and L3, or L2 and L3. For each allocation method, the load balancing controller can calculate the sum of the power requirements of all loads on the three phase lines, and compare whether the sum of the power requirements of all loads on the three phase lines meets the preset conditions. Furthermore, the load balancing controller can determine the target phase line corresponding to each charging terminal based on the sum of the power requirements of the three phase lines in the above-mentioned charging station. In this process, when the power demand of all loads on the three phase lines is greater than the power to be allocated corresponding to the phase line, because the power of non-charging loads needs to be fully supplied and cannot be allocated, and the power demand of charging loads will need to be cut and allocated as the power to be allocated, the difference between the ratio of the sum of the power demand of the charging loads of the three phase lines and the power balance parameter can be compared, and a distribution method with the smallest difference can be selected as the final phase line allocation plan. When the power demand of all loads on the three phase lines is less than the power to be allocated corresponding to the phase line, the difference between the sum of the power demand of all loads on the three phase lines can be compared, and a distribution method with the smallest difference can be selected as the final phase line allocation plan. Finally, the load balancing controller can calculate the power to be allocated of each charging terminal in the charging station based on the allocation result of the target phase line. In this process, the actual power to be allocated obtained by each charging terminal can be determined by weighted allocation or average allocation according to the power demand of each charging terminal and the power to be allocated of the target phase line.

[0111] This embodiment can accurately distribute the power of each phase line in the charging station by determining the final phase line distribution method and the power to be distributed of each charging terminal based on multiple phase line distribution methods. The above method can effectively avoid phase line overload, improve the safety and stability of the charging system, and improve the operating efficiency of the entire charging station by optimizing the power distribution method.

[0112] In one embodiment, if the power demand of all loads on a phase line is greater than the power to be allocated corresponding to the phase line, the power to be allocated of each charging terminal in the charging station can be calculated by the following method: determine the power allocation weight of each charging terminal in the charging station, and based on the power allocation weight of each charging terminal, perform weighted allocation of the power to be allocated of the charging station to obtain the power to be allocated of each charging terminal, or, according to the number of charging terminals in the charging station, evenly allocate the power to be allocated of the charging station to obtain the power to be allocated of each charging terminal.

[0113] Specifically, the load balancing controller can determine the power allocation weight of each charging terminal according to the actual situation of each charging terminal in the charging station. The weight can be determined based on a variety of factors, such as the required power of the charging terminal, the charging priority, the power state of the load, the charging time, etc. For example, if a charging terminal has a large power demand or a low power, it may be assigned a higher power allocation weight so that it can be charged faster. Further, after determining the power allocation weights of each charging terminal, the load balancing controller can perform weighted allocation of the power to be allocated in the charging station based on these weights, so that the ratio of the charging power actually obtained by each charging terminal is the same as the ratio of the power allocation weights of each charging terminal. Weighted allocation can ensure that while meeting the needs of each charging terminal as much as possible, it can achieve balanced power allocation as much as possible to avoid overloading of certain phases or charging terminals. In addition, as a simplified allocation method, the load balancing controller can also evenly allocate the power to be allocated in the charging station according to the number of each charging terminal in the charging station. In this way, regardless of the actual situation of each charging terminal, it will obtain equal charging power, where the average allocation can be applicable to scenarios where the charging demand is relatively uniform and the difference is not large.

[0114] This embodiment provides two power allocation methods, weighted allocation and average allocation, to achieve flexible allocation of power to be allocated to each charging terminal in the charging station. Among them, the weighted allocation method can more accurately reflect the actual needs of each charging terminal, improve charging efficiency and user experience; the average allocation method can simplify the calculation process and is suitable for fast allocation in specific scenarios. These two allocation methods can be switched according to actual conditions to ensure the efficiency and safety of power allocation in the charging station.

[0115] In one embodiment, the power allocation weight of each charging terminal can be determined by the following method: the power allocation weight of each charging terminal is determined according to the ratio between the required power of each charging terminal on the same phase line and the sum of the required power of each charging terminal in the phase line, or the power allocation weight of each charging terminal is determined according to the power setting parameters and / or charging priority of each charging terminal.

[0116] Specifically, the power requirements of all loads on the phase line, including the power requirements of non-charging loads and charging loads, exceed the maximum power allowed by the phase line. When calculating the power to be allocated, the load balancing controller can determine the power allocation weight of each charging terminal according to the ratio between the power requirements of each charging terminal on the same phase line and the sum of the power requirements of each charging terminal in the phase line. By calculating the ratio between the power requirements of each charging terminal and the sum, a relative weight can be obtained, which can reflect the proportion of charging demand of the charging terminal on the phase line, thereby serving as the basis for power allocation. In addition, the load balancing controller can also determine the power allocation weight according to the power setting parameters and / or charging priority of each charging terminal. Among them, the power setting parameters can be the maximum charging power or recommended charging power preset by the charging terminal, and the charging priority can be set based on factors such as the type of charging terminal, user level, and urgency. By comprehensively considering the above factors, the load balancing controller can allocate a more accurate power weight to each charging terminal to meet specific charging needs. It should be noted that the above two methods of determining the power allocation weight are not isolated. The load balancing controller can select one, two or more methods in combination according to actual conditions to achieve a better power allocation effect.

[0117] This embodiment determines the power allocation weight based on multiple factors such as the demand power ratio and the charging terminal setting parameters / priority, so as to achieve accurate allocation of power to each charging terminal in the charging station, thereby ensuring the accuracy and efficiency of power allocation to each phase line of the charging station.

[0118] In one embodiment, the power to be allocated of each charging terminal in the charging station can be calculated by the following method: calculate the power to be allocated corresponding to the two phase lines connected to each charging terminal in the charging station, and use the smaller power to be allocated corresponding to the two phase lines connected to the charging terminal as the reference standard for the power to be allocated of the charging terminal, and / or obtain the actual charging power of each charging terminal in the charging station, and when the actual charging power of the charging terminal is less than the power to be allocated of the charging terminal, set the actual charging power of the charging terminal as the power to be allocated of the charging terminal.

[0119] Specifically, the load balancing controller can calculate the power to be allocated corresponding to the two phase lines connected to each charging terminal in the charging station. In this embodiment, the same charging terminal passes through two phase lines. In the calculation, for the same charging terminal, different phase lines may have different power allocations. Therefore, the power values ​​of the two phase lines can be calculated respectively, and their sizes can be compared. After obtaining the power to be allocated of the two phase lines, the smaller of the two power values ​​is used as the reference standard for the final power to be allocated of the charging terminal. In this way, it can be ensured that the charging terminal will not damage the equipment due to excessive power during the charging process, and the risk of phase line overload can be avoided. In addition, the load balancing controller can also monitor the actual charging power of each charging terminal in the charging station in real time and compare it with the power to be allocated. If the actual charging power of a charging terminal is less than its power to be allocated, that is, there is power redundancy, the load balancing controller can automatically adjust the power to be allocated of the charging terminal and set it to the actual charging power. In this way, the power resources of the charging station can be used more accurately to avoid unnecessary waste. At the same time, the released redundant power can be redistributed to other charging terminals that need more power.

[0120] This embodiment calculates the power to be allocated of the charging terminal on the two phase lines and takes the smaller value as the reference standard for the final allocation result, and performs power allocation by real-time monitoring and adjusting the difference between the actual charging power of the charging terminal and the power to be allocated. This can achieve accurate allocation of the power to be allocated to each charging terminal in the charging station, thereby improving the safety and stability of the charging process and ensuring the effective use of power resources.

[0121] In one embodiment, the power to be allocated of each charging terminal can be calculated by the following method: the power to be allocated of each charging terminal in the charging station is calculated so that the sum of the power to be allocated of all loads connected to the same phase line in the charging station is less than the power to be allocated corresponding to the phase line, and the sum of the power to be allocated of all loads in the charging station is less than the power to be allocated corresponding to the charging station.

[0122] Specifically, for each phase line in the charging station, the load balancing controller can traverse the various charging terminals connected to the same phase line in the charging station, and allocate the power to be allocated to each charging terminal according to the charging requirements, priority and other information of each charging terminal. In this process, the load balancing controller needs to ensure that the sum of the power to be allocated of all loads on each phase line does not exceed the power to be allocated corresponding to the phase line, so as to avoid overloading the phase line and ensure the safety and stability of the charging process. At the same time, the load balancing controller also needs to calculate the sum of the power to be allocated of all loads and ensure that this sum does not exceed the power to be allocated corresponding to the charging station, so as to ensure that the power resources of the charging station can be reasonably allocated, thereby avoiding waste or shortage of power resources.

[0123] In one embodiment, the charging control method may further include the following steps: replacing the power balance parameter with the current balance parameter, replacing the required power with the required current, and replacing the power to be allocated with the current to be allocated to generate a scheduling instruction. In this embodiment, the above replacement method may be applied to any embodiment of the charging control method to simplify the calculation process of power regulation.

[0124] Specifically, since the voltage supply of the charging station is usually maintained at a relatively stable level, the ratio of the current value to the power value is fixed, and the current value can be used instead of the power value to complete the charging control, analysis and calculation in this application. For example, the power balance parameter is replaced by the current balance parameter, the demand current replaces the demand power, and the current to be allocated replaces the power to be allocated. In addition, the charging current can be used instead of the charging power, the maximum current can be used instead of the maximum power, the current can be used instead of the power, and so on. In the above manner, the calculation process and difficulty of each link can be simplified, thereby improving the efficiency of generating scheduling instructions.

[0125] This embodiment can achieve reasonable allocation and effective utilization of power resources in the charging station by considering and satisfying the power limit conditions of the phase line and the charging station as a whole when calculating the power to be allocated for each charging terminal in the charging station. The above method can improve the safety and stability of the charging process, ensure charging efficiency, and avoid waste of power resources and unnecessary cost expenditure.

[0126] The embodiment of the present application also provides a computer device, which can be a personal computer, a server, a network device, etc. The computer device includes a bus, a processor, a memory and a communication interface, and can also include an input and output interface and a display device. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store location information. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, the steps in each method embodiment are implemented.

[0127] Those skilled in the art will appreciate that the structure of the above-mentioned computer device is only a partial structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components, or combine certain components, or have a different arrangement of components.

[0128] In one embodiment, a computer-readable storage medium is provided. The computer-readable storage medium may be non-volatile or volatile, and stores a computer program thereon. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0129] In one embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a processor.

[0130] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0131] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0132] The above-described 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 the present application. 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 protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A charging terminal, characterized in that: The charging terminal is provided with a switch assembly and a charging controller, wherein the switch assembly includes a plurality of switch devices, and the charging station where the charging terminal is located is provided with a detection device and a load balancing controller, wherein: The input end of the detection device is connected to the grid side of the three phase lines, the output end of the detection device is connected to each charging terminal in the charging station, the signal output end of the detection device is connected to the load balancing controller, and the load balancing controller is also connected to the charging controller of each charging terminal in the charging station; The charging terminal comprises three input terminals and two output terminals, the switch component is connected between the input terminals and the output terminals of the charging terminal, and the control terminal of the switch component is connected to the charging controller; The detection device is used to detect the current detection signals of the three phase lines in the charging station; the load balancing controller is used to generate a scheduling instruction based on the current detection signal; the charging controller is used to generate a switch control instruction based on the scheduling instruction; the switch assembly is used to control the closure of two switching devices in the switch assembly based on the switch control instruction, so that the load to be charged is connected to two of the three phase lines and charged.

2. The charging terminal according to claim 1, characterized in that: The switch assembly includes three input terminals and two output terminals, and the switch assembly includes at least four switch devices, wherein: The three input terminals of the switch assembly are connected to the three phase lines through the detection device; The two output ends of the switch assembly are respectively connected to the three input ends of the switch assembly through a plurality of switch devices, wherein each of the switch devices is connected in series between an input end and an output end of the switch assembly, and at least one of the three input ends of the switch assembly is respectively connected to the two output ends of the switch assembly through two of the switch devices; In the same charging period, two switch devices respectively connected to the two output terminals of the switch component are in a closed state, and the two closed switch devices are respectively connected to different input terminals.

3. The charging terminal according to claim 1, characterized in that: The scheduling instruction also includes a current regulation instruction and / or a power regulation instruction; the charging controller is also used to charge the load to be charged based on the current value indicated in the current regulation instruction, and / or to charge the load to be charged based on the power value indicated in the power regulation instruction.

4. The charging terminal according to claim 1, characterized in that: The load balancing controller: In response to detecting that any load in the charging station changes its power usage state, obtaining a power balance parameter of the charging station and power requirements of each charging terminal and non-charging load in the charging station; Based on the power balance parameters of the charging station and the required power of each of the charging terminals and non-charging loads, determine the target phase line corresponding to each charging terminal, and calculate the power to be allocated for each charging terminal in the charging station, wherein the target phase line is two of the three phase lines on the grid side; A scheduling instruction is generated based on the target phase line corresponding to each charging terminal and the power to be allocated of each charging terminal in the charging station.

5. The charging terminal according to claim 4, characterized in that: The load balancing controller replaces the power balance parameter with a current balance parameter, replaces the required power with a required current, replaces the to-be-allocated power with a to-be-allocated current, and generates a scheduling instruction.

6. The charging terminal according to claim 1, characterized in that: The charging terminal is also provided with a communication controller, the communication controller is connected to the charging controller, and the charging controller is communicatively connected to the load balancing controller via the communication controller.

7. The charging terminal according to claim 6, characterized in that: The load balancing controller is arranged at at least one of the charging terminal, the local charging station and the cloud server; When the load balancing controller is arranged in the charging terminal, the charging controller in the charging terminal is used as the load balancing controller, and the load balancing controller is communicatively connected with the communication controllers of other charging terminals in the charging station through the communication controller; and / or, When the load balancing controller is arranged locally in the charging station, the load balancing controller is connected to the communication controllers of each charging terminal in the charging station through a communication module; and / or, When the load balancing controller is arranged in the cloud server, the load balancing controller is connected to the communication controllers of each charging terminal in the charging station through a network.

8. A charging control method, characterized in that: The method comprises: In response to detecting that any load in the charging station changes its power usage state, obtaining a power balance parameter of the charging station and power requirements of each charging terminal and non-charging load in the charging station; Based on the power balance parameters of the charging station and the required power of each of the charging terminals and non-charging loads, determine the target phase line corresponding to each charging terminal, and calculate the power to be allocated for each charging terminal in the charging station, wherein the target phase line is two of the three phase lines on the grid side; A scheduling instruction is generated based on the target phase line corresponding to each charging terminal and the power to be allocated of each charging terminal in the charging station.

9. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to claim 8 is implemented.

10. A computer device comprising a storage medium, a processor, and a computer program stored in the storage medium and executable on the processor, characterized in that: When the processor executes the computer program, the method according to claim 8 is implemented.

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