Charging system power limiting method, controller and charging system

Abstract

The application discloses a charging system power limiting method, a controller and a charging system, and relates to the technical field of new energy. The charging system comprises at least one power module, the method comprises the following steps: acquiring input limiting power and current input power of the charging system; issuing limiting power data to each power module based on the input limiting power and the current input power to feedback and adjust the current input power of the charging system; executing an updating process multiple times until a preset condition is met; wherein, in each updating process, the limiting power data is re-determined based on the current input power and the input limiting power of the charging system after adjustment, and the current input power of the charging system is again feedback and adjusted based on the re-determined limiting power data; and the preset condition comprises that the power difference between the current input power and the input limiting power of the charging system is within a preset range. Thus, the accuracy and precision of the charging system in limiting input power are improved.

Description

Technical Field

[0001] This application relates to the field of new energy technology, and in particular to a power limiting method, controller and charging system for a charging system. Background Technology

[0002] With the increasing popularity of electric vehicles (EVs) and the rapid development of charging infrastructure, the construction and operation of charging stations face numerous challenges. Particularly in large charging stations, the power limitations of the charging station restrict the power output of the upstream power supply. Furthermore, during operation, in order to achieve the system's rated output power, the input power of the charging pile often exceeds the upstream power supply, which can easily lead to problems such as overheating of the input cables and insulation failure, posing certain safety hazards. Therefore, precise limitation of the input power of the charging system is essential. Summary of the Invention

[0003] The main objective of this application is to provide a power limiting method, controller, and charging system for a charging system, so as to improve the accuracy and precision of limiting input power in the charging system.

[0004] To achieve the above objectives, this application provides a power limiting method for a charging system, the charging system including at least one power module, the method comprising:

[0005] Obtain the input power limit and current input power of the charging system;

[0006] Based on the input limit power and the current input power, power limit data is sent to each of the power modules to adjust the current input power of the charging system.

[0007] The update process is executed multiple times until the preset conditions are met;

[0008] In each update process, the power limit data is re-determined based on the current input power of the adjusted charging system and the input limit power, and the current input power of the charging system is adjusted again based on the re-determined power limit data; the preset condition includes that the power difference between the current input power of the charging system and the input limit power is within a preset range.

[0009] Optionally, after performing the update process, the method further includes: determining the power difference between the current input power of the charging system and the input limit power; wherein the power difference gradually decreases during multiple updates.

[0010] Optionally, the step of sending power limiting data to each of the power modules based on the input limit power and the current input power to adjust the current input power of the charging system includes: obtaining the current power conversion efficiency of the charging system; determining the power limiting data based on the input limit power and the current power conversion efficiency, and sending the power limiting data to each of the power modules; the power limiting data is used to adjust the current output power of the power modules to adjust the current input power of the charging system based on the current output power of each power module.

[0011] Optionally, determining the current power conversion efficiency of the charging system based on the input limit power and the current input power includes: determining the power difference between the input limit power and the current input power, and determining an adjustment parameter based on the power difference; and determining the current power conversion efficiency of the charging system based on the initial power conversion efficiency of the charging system, the power difference, the adjustment parameter, and the rated power of the charging system.

[0012] Optionally, determining the power limit data based on the input power limit and the current power conversion efficiency includes: using a preset formula and determining the power limit data based on the input power limit, current power conversion efficiency, power consumption parameters, and rated power of the charging system.

[0013] Optionally, after each adjustment of the current input power of the charging system, the method further includes: determining the power difference between the current input power of the adjusted charging system and the input limit power; if the power difference between the current input power of the adjusted charging system and the input limit power is within a preset range, then the update process ends; if the power difference between the current input power of the adjusted charging system and the input limit power is not within the preset range, then the update process is executed.

[0014] Optionally, obtaining the input limit power and current input power of the charging system includes: obtaining the input limit power of the charging system, and determining initial power limit data based on the input limit power, initial power conversion efficiency, power consumption parameters and rated power of the charging system; sending the initial power limit data to each of the power modules for execution; and obtaining the current input power of the charging system after a first preset time period.

[0015] Optionally, obtaining the current input power of the charging system includes: receiving the current input power sent by each of the power modules, and determining the current input power of the charging system based on the current input power of each of the power modules; or, collecting the current input power of the charging system from the electricity meter corresponding to the charging system.

[0016] Optionally, after obtaining the input limit power and current input power of the charging system, the method further includes: filtering the current input power of the charging system; the step of sending power limit data to each of the power modules based on the input limit power and the current input power to adjust the current input power of the charging system includes: sending power limit data to each of the power modules based on the input limit power and the filtered current input power to adjust the current input power of the charging system.

[0017] This application also provides a controller, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the charging system power limiting method as described above.

[0018] This application also provides a charging system, including a controller as described above and at least one power module; the controller is used to acquire an input limit power and the current input power of the charging system, and to issue power limit data to each of the power modules based on the input limit power and the current input power; the power module is used to adjust the current output power based on the power limit data to provide feedback adjustment of the current input power of the charging system; the controller is also used to perform an update process multiple times until a preset condition is met; wherein, in each update process, the power limit data is re-determined based on the adjusted current input power of the charging system and the input limit power, and the current input power of the charging system is adjusted again based on the re-determined power limit data; the preset condition includes that the power difference between the current input power of the charging system and the input limit power is within a preset range.

[0019] The charging system power limiting method of this application obtains the input limit power and the current input power of the charging system; then determines the power limiting data based on the input limit power and the current input power, and sends the power limiting data to each power module, so that the power module adjusts its current output power based on the power limiting data, thereby realizing feedback adjustment of the current input power of the power module, and thus adjusting the current input power of the charging system; by repeatedly executing the power limiting data update process, the current input power of the charging system gradually approaches the input limit power, until the power difference between the current input power and the input limit power of the charging system is within a preset range, thereby improving the accuracy and precision of the charging system in limiting the input power. Attached Figure Description

[0020] Figure 1 This is a scenario example of the power limiting method for a charging system according to an embodiment of this application;

[0021] Figure 2 This is one of the flowcharts of the charging system power limiting method according to the embodiments of this application;

[0022] Figure 3 This is the second flowchart of the charging system power limiting method according to an embodiment of this application;

[0023] Figure 4 This is the third flowchart of the charging system power limiting method according to the embodiments of this application;

[0024] Figure 5 This is the fourth flowchart of the charging system power limiting method according to the embodiments of this application;

[0025] Figure 6 This is the fifth flowchart of the charging system power limiting method according to the embodiments of this application;

[0026] Figure 7 This is a power limiting trend chart of a specific example from this application;

[0027] Figure 8 This is a schematic diagram of a charging system power limiting device according to an embodiment of this application;

[0028] Figure 9 A schematic diagram of the physical structure of a controller is provided;

[0029] In the diagram, 110 is the charging device; 120 is the cloud / server; 130 is the power grid; 800 is the charging system power limiting device; 810 is the acquisition module; 820 is the update module; 910 is the processor; 920 is the communication interface; 930 is the memory; and 940 is the communication bus.

[0030] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] With the increasing popularity of electric vehicles (EVs) and the rapid development of charging infrastructure, the construction and operation of charging stations face numerous challenges. Especially in large charging stations, the upstream power supply is often severely constrained due to limited grid capacity or limitations in power distribution facilities. In such cases, to meet the simultaneous charging needs of multiple electric vehicles, charging piles need to utilize existing power resources as efficiently as possible to achieve the system's rated output power.

[0033] However, in practical applications, due to the power limitations of charging stations and the need to meet the rated output power of the charging system, the input power of the charging pile equipment may exceed the upstream power supply. This overload operation not only increases the pressure on the power grid but also brings a series of safety hazards. For example, excessively high input power may cause the cable connecting the charging pile and the power grid to overheat, leading to aging and failure of the insulation material, and even serious accidents such as fires.

[0034] Furthermore, frequent overload operation can accelerate equipment aging, shorten its lifespan, and increase maintenance costs. Therefore, effectively limiting the input power of the charging system to ensure its safe and stable operation has become one of the key technical issues that urgently need to be addressed in the construction and operation of charging stations.

[0035] Currently, the existing power limiting method for charging systems is as follows: a portable DC charging device is used to separate the charging device body from the AC input cable and connect them in a plug-and-play manner. The input cable power is determined by identifying the input cable flag, and this power is compared with the power requirement of the BMS (Battery Management System) after charging. The smaller value is used as the system input, thereby achieving the function of input power limiting.

[0036] However, simply using the smaller value for comparison cannot accurately achieve the input power limit and may result in wasted charging station power. Furthermore, this input power limiting method is primarily suitable for single-terminal charging systems, not distributed charging systems, and requiring an additional portable power limiting device increases the cost of the charging system; the plug-and-play connection method also carries the risk of aging.

[0037] In short, the above input power limiting methods have the following problems: (1) Due to the limitations of system type or hardware, their applicable scope is narrow; (2) The accuracy of input power limiting is low, which easily leads to power waste.

[0038] Therefore, this application provides a charging system power limiting method, controller, and charging system. The method limits the input power of the charging system through software programs, eliminating the need for external devices and reducing the cost of the charging system. Furthermore, the controller interacts with the charging module in the charging system, continuously adjusting the power limiting data of the charging module to adjust the current input power of the charging system. This gradually brings the current input power of the charging system closer to the required input limit power. After multiple adjustments, the current input power of the charging system reaches the input limit power, improving the accuracy and precision of the charging system in limiting the input power.

[0039] For ease of understanding, this specification provides a scenario example of a power limiting method for a charging system, which is applied in situations such as... Figure 1 In the application environment shown, the scenario example includes a charging device 110, a cloud / server 120, and a power grid 130; the cloud / server 120 is communicatively connected to the charging device 110, and the power grid 130 is electrically connected to the charging device 110.

[0040] In this scenario example, the charging device 110 can be any charging device 110, such as an AC charging pile, a DC charging pile, a single-pile dual-gun DC charging pile, or a DC group charging system (including a power host and multiple charging terminals). No specific limitations are imposed here. The charging device 110 may include a controller (e.g., MCCU, MCU, etc.), an LCS (Local Control System), several DC power modules, and other devices / modules such as I / O boards and charging terminals. The LCS can communicate with the cloud / server 120, and the controller can connect to the LCS and DC power modules for data exchange.

[0041] Cloud devices or servers are typically used to monitor and manage the various charging stations and charging devices 110 throughout the entire charging equipment 110, and to adjust parameters as needed to optimize performance, ensure safety, or meet specific user requirements.

[0042] When the charging device 110 starts working, the cloud / server 120 sends the input limit power to the charging device 110; the LCS of the charging device 110 receives the input limit power sent by the cloud / server 120 and sends it to the controller; the controller then determines the initial power limit data of each power module based on the sent input limit power, and the controller then sends the initial power limit data to each power module.

[0043] In this scenario example, the charging device 110 can be connected to the power grid 130 through a front-end power supply device (e.g., transformer, distribution cabinet, etc.). After the power grid 130 supplies power to the charging device 110 through the front-end power supply device, each power module in the charging device 110 limits its own output power according to the initial power limit data issued. The controller waits for a period of time to ensure that the power limit data takes effect. Furthermore, the controller can obtain the current input power of each power module, and thus obtain the current input power of the charging device 110 based on the current input power of each power module. The controller can compare the current input power of the charging device 110 with the input limit power issued by the cloud / server 120, and adjust the power limit data based on the comparison result, thereby controlling each power module to adjust its own output power, and thus adjusting the current input power of the charging device 110.

[0044] After multiple adjustments to the power limit data, the current input power of the charging device 110 gradually approaches, and even reaches, the input limit power. This not only improves the accuracy and precision of the charging device 110 in limiting the input power, but also allows the charging device 110 to operate at a more efficient level, reducing losses during energy conversion and effectively minimizing power waste.

[0045] In addition, during the experimental testing phase, a power analyzer can be set up between the charging device 110 and the pre-power supply equipment to collect the input power of the charging device 110. The input power collected by the power analyzer can be used to manually verify or test the adjustment effect of the current input power of the charging device 110 and test and verify the adjustment accuracy.

[0046] Referring to the scenario examples of the charging system power limiting method in the foregoing embodiments, the charging system power limiting method of this application embodiment will be described in detail below.

[0047] Figure 2 This is one of the flowcharts for a charging system power limiting method according to an embodiment of this application. This charging system power limiting method can be executed by the controller in the foregoing embodiments. Furthermore, the charging system may include at least one power module. Figure 2 As shown, the power limiting method for this charging system may include the following steps:

[0048] Step 210: Obtain the input limit power and current input power of the charging system.

[0049] Step 220: Based on the input power limit and the current input power, send power limit data to each power module to adjust the current input power of the charging system.

[0050] Step 230: Execute the update process multiple times until the preset conditions are met; wherein, during each update process, the power limit data is re-determined based on the current input power and input limit power of the adjusted charging system, and the current input power of the charging system is adjusted again based on the re-determined power limit data.

[0051] In this embodiment, the preset condition includes the power difference between the current input power and the input limit power of the charging system being within a preset range. Furthermore, it is worth noting that since the current input power will be lower than the input limit power after one adjustment, if the power difference is obtained by subtracting the current input power from the input limit power, and the power difference is positive, then the upper and lower limits of the preset range can also be set to positive numbers. For example, the preset range can be set to [0, 1.5] kW. Conversely, if the power difference is obtained by subtracting the input limit power from the current input power, and the power difference is negative, then the upper and lower limits of the preset range can also be set to negative numbers. For example, the preset range can be set to [-1.5, 0] kW.

[0052] It is also necessary to explain another operating condition here. Before adjusting the current input power of the charging system, the current input power of the charging system may be greater than the input limit power. However, through a few adjustments, the current input power will be less than the input limit power. Therefore, the preset range can still be set in the above way.

[0053] It should be noted that the input power limit refers to the maximum input power that the charging system can accept during normal operation. Setting the input power limit is crucial to ensuring the safe and stable operation of the charging system. Furthermore, the power limit data can be a power limit point command or other command data that can limit the output power of the power module. The power limit data is control data used to control the output power of the power module. The specific form of the power limit data is not limited here; the embodiments in this application will primarily use the power limit point as an example for detailed description.

[0054] In step 210, the controller first obtains the input limit power of the charging system. This can be done either by the cloud / server sending the input limit power to the charging system's controller, or by having staff directly set the input limit power on the host computer. The specific method for obtaining the input limit power depends on the charging system's architecture and application scenario, and is not specifically limited here. Furthermore, the input limit power can be set manually by staff or based on the charging system's load constraint scheduling strategy.

[0055] Furthermore, when the charging system is operating, the controller can obtain the current input power of the charging system. In this example, the controller can obtain the current input power of the charging system in the following ways: by setting current and voltage sensors at the input end of the charging system to collect the input current and input voltage, and then using the input current and input voltage to calculate the current input power; another way to obtain the current input power is to set up a smart meter for the charging system, and the controller can obtain the current input power of the charging system by acquiring the data from the smart meter. In addition, the current input power of the charging system can also be obtained by setting up a dedicated integrated circuit, power module reporting, etc., which will not be elaborated here.

[0056] In step 220, after the controller obtains the input limit power and the current input power of the charging system, it can compare the input limit power and the current input power. When the input limit power is greater than the current input power, the power limit point can be appropriately increased, and the adjusted power limit point is sent to each power module. After receiving the adjusted power limit point, each power module controls its current output power based on the adjusted power limit point, ensuring that its current output power is below the limited maximum output power. It can be understood that when the power limit point increases, the limited maximum output power will also increase; and when the current output power of a power module increases, the current input power of that power module will also increase; after the current input power of all power modules increases, the current input power of the entire charging system will increase, thereby achieving the purpose of feedback adjustment of the current input power of the charging system.

[0057] Similarly, when the input power limit is less than the current input power, the power limit point can be appropriately reduced, and the adjusted power limit point is sent to each power module. After receiving the adjusted power limit point, each power module controls its current output power based on the adjusted power limit point, ensuring that its current output power is below the maximum limited output power. When the power limit point decreases, the maximum limited output power also decreases; and when the current output power of a power module decreases, the current input power of that power module also decreases; after all power modules decrease their current input power, the current input power of the entire charging system decreases.

[0058] It should be noted that the adjustment range of the power limit point can be determined based on the difference between the input power limit and the current input power; the greater the difference between the input power limit and the current input power, the greater the adjustment range of the power limit point can be. Similarly, the smaller the difference between the input power limit and the current input power, the smaller the adjustment range of the power limit point can be.

[0059] In step 230, the controller can execute the power limit point update process multiple times until the power difference between the current input power and the input limit power of the charging system is within a preset range. In this embodiment, the preset range can be set by the operator according to actual needs. For example, if the power difference is obtained by subtracting the current input power from the input limit power, the preset range can be set to [0, 1.5] kW, that is, the current input power is equal to the input limit power, or the power difference obtained by subtracting the current input power from the input limit power is less than 1.5 kW.

[0060] Specifically, after the controller sends the power limit point to the power module, it re-acquires the current input power of the charging system and compares the difference between the re-acquired current input power and the input limit power. If the power difference between the input limit power and the current input power is within a preset range, the power limit point does not need to be adjusted; if the power difference between the input limit power and the current input power is not within the preset range, the power limit point is adjusted and updated based on the comparison result between the input limit power and the current input power.

[0061] Each time the power limit point is adjusted, updated, and sent to each power module, the current input power of the charging system is reacquired, and it is determined whether the current input power of the charging system meets the preset conditions. By continuously adjusting the power limit point, the current input power of the charging system gradually approaches the input limit power until the preset conditions are met or the input limit power is reached.

[0062] In some implementations, after the update process is performed, the power limiting method for the charging system may further include: determining the power difference between the current input power of the charging system and the input limit power; wherein the power difference gradually decreases during multiple updates.

[0063] Specifically, each time the power module adjusts the current input power of the charging system based on the power limit point, it can calculate the difference between the current input power and the input limit power to obtain the power difference value. The power difference value obtained after adjustment is smaller than the power difference value before adjustment.

[0064] In short, by repeatedly executing the above update process, the power difference between the current input power and the input limit power of the charging system gradually changes during the continuous update process, and the power difference gradually decreases, so that the current input power of the charging system gradually approaches the input limit power.

[0065] It is worth noting that, in this embodiment, since the adjusted current input power is always lower than the input limit power, the current input power gradually increases and approaches the input limit power through multiple adjustments, rather than fluctuating around the input limit power. This adjustment process has a certain degree of safety, ensuring that the current output power will not exceed the input limit power.

[0066] Furthermore, a computer program can be designed based on the aforementioned power limiting method for charging systems, and this program can be written into the controller of the charging system. By executing this computer program, the controller can limit the input power of the charging system, regardless of the type or hardware limitations, making it applicable to any charging system. Moreover, by adjusting the input power through feedback from the output power control module, the current input power of the charging system asymptotically approaches the input limit power until it is reached. This effectively improves the accuracy and precision of limiting the input power of the charging equipment and reduces power waste.

[0067] Figure 3 This is the second flowchart of the charging system power limiting method according to an embodiment of this application. Figure 3 As shown, in some embodiments, step 210, obtaining the input limit power and current input power of the charging system, may include the following steps:

[0068] Step 310: Obtain the input limit power of the charging system, and determine the initial power limit data based on the input limit power of the charging system, the initial power conversion efficiency, the power consumption parameters, and the rated power.

[0069] Step 320: Send the initial power limit data to each power module for execution.

[0070] Step 330: After a first preset time period, obtain the current input power of the charging system.

[0071] The initial power limit data can be the initial power limit point. The following introduction will still use the power limit point and the initial power limit point as examples.

[0072] It should be noted that the initial power conversion efficiency refers to the power conversion efficiency initially set for the charging system. Power conversion efficiency is the ratio of the charging system's output power to its input power. The initial power conversion efficiency can be manually set by operators according to actual needs. Power consumption parameters refer to the energy consumed by the charging system itself during the charging process. This energy is not directly used for charging but is used to maintain the charging system's operation and support its functions. Power consumption parameters can include both overall power consumption and terminal power consumption. Overall power consumption can include the power consumption of the I / O board, control circuit power consumption, auxiliary circuit power consumption, etc. Rated power refers to the overall rated power of the charging system, specifically the maximum power that the charging system can continuously and stably output under normal operating conditions. In this embodiment, the power consumption parameters can be pre-calculated and stored in the controller along with parameters such as the rated power for direct retrieval during subsequent use.

[0073] In this embodiment, after the controller receives the input power limit from the cloud / server, the controller can calculate an initial power limit point based on the input power limit and then send the initial power limit point to each power module; each power module executes the initial power limit point to limit its current output power.

[0074] In some implementations, the initial power limiting point can be determined by the following formula:

[0075] f(x0)=((P limit –P consp )*η0) / P max

[0076] Where f(x0) is the initial power limit point of the power module; P limit Input power limit for the charging system; P consp Here, η0 represents the power consumption parameter of the charging system; P represents the initial power conversion efficiency of the charging system. max This refers to the rated power of the charging system.

[0077] It should be noted that when determining the initial power limit point, the initial power conversion efficiency is a fixed value, and in order to ensure that the current input power of the charging system does not exceed the input limit power during the entire update and adjustment process, the initial power conversion efficiency can be set to a relatively small value. Furthermore, all power limit points mentioned in the embodiments of this application are in the range of 0 to 1, and all power conversion efficiencies are in the range of 0% to 100%. The actual range of power conversion efficiency depends on the conversion efficiency of the charging system.

[0078] As an example, in a 360kW rated power DC charging system, if the input power limit P issued by the cloud... limitThe current input power of the charging system is 268.872kW, the initial power conversion efficiency is 94.50%, and the power consumption parameter of the charging system is 1.42kW. Substituting the input limit power, current input power, initial power conversion efficiency, and power consumption parameter into the above formula for calculating the initial power limit point, we can get f(x0)=(300-1.42)*9450 / (360*10000)=0.78377, that is, the initial power limit point of the power module is 0.78377.

[0079] After obtaining the initial power limit point, the controller sends it to each power module for execution. Since the power modules need a certain adjustment time to adjust their current output power based on the initial power limit point, the controller can wait for a first preset duration to ensure that each power module's adjustment is stable before re-acquiring the current input power of the charging system. In this embodiment, the first preset duration can be set by the operator according to actual needs. Because the adjustment range of the power module's initial adjustment of its current output power is relatively large, the adjustment time will also be relatively long. Therefore, the first preset duration can be set relatively large, for example, it can be set to 10 seconds. No specific limitation is made to the first preset duration here.

[0080] In some implementations, obtaining the current input power of the charging system may include: receiving the current input power sent by each power module and determining the current input power of the charging system based on the current input power of each power module; or, collecting the current input power of the charging system from the electricity meter corresponding to the charging system.

[0081] This application provides two specific methods for obtaining the current input power of the charging system. The methods for obtaining the current input power can also be other methods described in the foregoing embodiments. Only two of these methods are described in detail here.

[0082] Firstly, one method for obtaining the current input power of the charging system is to receive the current input power sent by each power module and determine the current input power of the charging system based on the current input power of each power module. Specifically, when the controller needs to obtain the current input power of the charging system, it can send an acquisition request to each power module. After receiving the acquisition request, the power module can report its own current input power to the controller. After receiving the current input power reported by each power module, the controller can sum the current input power of all power modules to obtain the current input power of the charging system. Alternatively, sensors or data acquisition modules can be set in the power modules to obtain their own current input power.

[0083] The second method for obtaining the current input power of the charging system is to collect the current input power from the corresponding electricity meter. Specifically, a smart meter can be installed at the input end of the charging system. The smart meter can not only measure energy consumption but also monitor current and voltage in real time, thereby calculating the current input power of the charging system. Smart meters typically support remote data reading, facilitating the controller to obtain the real-time current input power; alternatively, a data acquisition device can be installed at the smart meter to collect its data and send it to the controller.

[0084] To ensure the accuracy of subsequent adjustment of the current input power of the charging system, in some embodiments, after obtaining the input limit power and the current input power of the charging system, the power limiting method of the charging system may further include: filtering the current input power of the charging system. Sending power limit data to each power module based on the input limit power and the current input power to provide feedback adjustment of the current input power of the charging system may include: sending power limit data to each power module based on the input limit power and the filtered current input power to provide feedback adjustment of the current input power of the charging system.

[0085] Specifically, after obtaining the current input power of the charging system, the controller can filter the current input power of the charging system. The filtering methods include (but are not limited to): using algorithms such as moving average filtering algorithm, first-order low-pass filtering algorithm, Kalman filtering algorithm, infinite impulse response filter, finite impulse response filter algorithm, median filtering algorithm, etc. to filter the current input power of the charging system.

[0086] After obtaining the filtered current input power of the charging system, the controller compares this current input power with the input limit power to determine the power limit data. It's important to note that each time the current input power of the charging system is re-acquired, it needs to be filtered to ensure the accuracy of the charging system power limit.

[0087] Figure 4 This is the third flowchart of the charging system power limiting method according to an embodiment of this application. Figure 4 As shown, in some embodiments, step 220, which sends power limit data to each power module based on the input power limit and the current input power to adjust the current input power of the charging system, may include the following steps:

[0088] Step 410: Obtain the current power conversion efficiency of the charging system.

[0089] Step 420: Determine the power limit data based on the input power limit and the current power conversion efficiency, and send the power limit data to each power module; the power limit data is used to adjust the current output power of the power module, so as to adjust the current input power of the charging system based on the current output power of each power module.

[0090] Specifically, after obtaining the current input power of the filtered charging system, the controller can first adjust the initial power conversion efficiency using the input limit power and the current input power to obtain the current power conversion efficiency. It should be noted that subsequent adjustments to the power conversion efficiency are all based on the original power conversion efficiency.

[0091] The method of adjusting the power conversion efficiency by comparing the input limit power and the current input power can be as follows: Compare the input limit power with the current input power. If the input limit power is greater than the current input power, the power conversion efficiency can be appropriately increased. When the power conversion efficiency increases, the power module's power conversion efficiency improves, meaning that more input energy in the power module is converted into useful output energy. If the input limit power is less than the current input power, the power conversion efficiency can be appropriately decreased. When the power conversion efficiency decreases, the power module's power conversion efficiency decreases, meaning that less input energy is converted into output energy in the power module.

[0092] Furthermore, the controller can redetermine the power limit data of the power modules based on the input power limit and the current power conversion efficiency. The controller then sends the power limit data to each power module for execution. After receiving the new power limit data, each power module adjusts its current output power based on the new power limit data to ensure that the current output power is below the power limit.

[0093] It is understandable that when the current output power of a power module changes, its current input power will also change accordingly. For example, if the power output required by a power module decreases, the required input power will also decrease if the power conversion efficiency remains constant. Therefore, by adjusting the power limit data, the input power of the power modules can be effectively adjusted, and as the current input power of each power module changes, the current input power of the charging system will change accordingly.

[0094] Figure 5 This is the fourth flowchart of the charging system power limiting method according to an embodiment of this application. Figure 5 As shown, in some embodiments, step 410, which determines the current power conversion efficiency of the charging system based on the input limit power and the current input power, may include the following steps:

[0095] Step 510: Determine the power difference between the input limit power and the current input power, and determine the adjustment parameters based on the power difference.

[0096] Step 520: Determine the current power conversion efficiency of the charging system based on the initial power conversion efficiency, power difference, adjustment parameters, and rated power of the charging system.

[0097] Specifically, the controller can first calculate the difference between the input limit power and the current input power to obtain the power difference. In this embodiment, the power difference can be denoted as P. diff Power difference P diff The calculation formula can be: power difference P diff =Input limiting power P limit -Current input power P input .

[0098] Furthermore, after the controller obtains the power difference between the input limit power and the current input power, it can determine an adjustment parameter based on the power difference. This adjustment parameter characterizes the degree of adjustment in the current power conversion efficiency. The method for determining the adjustment parameter based on the power difference can be as follows: a correspondence between the power difference and the adjustment parameter can be designed, and this correspondence can be used as a mathematical model. When the adjustment parameter needs to be obtained, the power difference can be directly input into this mathematical model, and the model will output the corresponding adjustment parameter according to the pre-set relationship.

[0099] Another way to determine the adjustment parameters based on the power difference is to pre-configure a correspondence table between power differences and adjustment parameters in the controller. The correspondence table includes several power differences and corresponding adjustment parameters. When it is necessary to obtain the adjustment parameters, the corresponding adjustment parameters can be retrieved directly from the correspondence table based on the power difference.

[0100] After obtaining the adjustment parameters, the controller can determine the current power conversion efficiency of the charging system based on the initial power conversion efficiency, power difference, adjustment parameters, and rated power of the charging system. In some implementations, the current power conversion efficiency can be determined using the following formula:

[0101] η i =(η0+(D) i *P diff *100) / P max )

[0102] Where, η i The current power conversion efficiency is obtained after the i-th adjustment; η0 is the initial power conversion efficiency; D i P is the adjustment parameter for the i-th adjustment; diff P represents the power difference. maxThis refers to the rated power of the charging system.

[0103] In some implementations, determining the power limit data based on the input power limit and the current power conversion efficiency may include: using a preset formula and determining the power limit data based on the input power limit of the charging system, the current power conversion efficiency, power consumption parameters, and the rated power.

[0104] Specifically, after updating and adjusting the initial power conversion efficiency to obtain the current power conversion efficiency, the controller can redetermine the power limit data using the current power conversion efficiency. The power limit data can be determined using the following preset formula:

[0105] f(x i )=((P limit –P consp )*η i ) / P max

[0106] Where, f(x) i P represents the power limit data of the power module obtained from the i-th adjustment; limit The input power limit for the charging system; P consp For the power consumption parameters of the charging system; η i P represents the current power conversion efficiency obtained from the i-th adjustment. max This refers to the rated power of the charging system.

[0107] Therefore, the controller adjusts and updates the power limit data based on the acquired current input power of the charging system, and sends the new power limit data to each power module for execution. At this point, an adjustment of the current input power of the charging system is completed. Further adjustments can be made by acquiring the current input power of the charging system again, and then determining whether the adjusted current input power meets the preset conditions.

[0108] Similarly, since the power modules also need a certain adjustment time to adjust their current output power based on the adjusted power limit data, the controller can wait for the second preset time to ensure that the adjustment of each power module is stable before the controller reacquires the current input power of the charging system. In this embodiment, the second preset time can also be set by the operator according to actual needs. However, this adjustment stage is a fine-tuning stage, so the second preset time can be set shorter than the first preset time to effectively shorten the overall adjustment time. For example, the second preset time can be set to 4 seconds. No specific limitation is made to the second preset time here.

[0109] Figure 6 This is the fifth flowchart of the charging system power limiting method according to an embodiment of this application. Figure 6As shown, in some embodiments, after each adjustment of the current input power of the charging system, the charging system power limiting method may further include the following steps:

[0110] Step 610: Determine the power difference between the current input power and the input limit power of the adjusted charging system.

[0111] Step 620: If the power difference between the current input power and the input limit power of the adjusted charging system is within the preset range, then the update process ends.

[0112] Step 630: If the power difference between the current input power and the input limit power of the adjusted charging system is not within the preset range, then execute the update process.

[0113] Specifically, after waiting for a second preset time period, the controller reacquires the current input power of the adjusted charging system. It then subtracts the input limit power from the current input power of the adjusted charging system to obtain the power difference. At this point, the controller determines whether this power difference is within a preset range. If the power difference is within the preset range, the controller can end the update process, and the current input power of the charging system has reached the input limit power. If the power difference is not within the preset range, the controller continues to update the adjustment limit power data based on the current input power of the charging system until the power difference between the current input power and the input limit power is within the preset range.

[0114] The process of repeatedly acquiring the current input power of the charging system and updating the power limit data based on the current input power of the charging system can refer to the aforementioned process of updating the power limit data, and will not be repeated here.

[0115] To facilitate understanding, the power limiting method of the charging system according to the embodiments of this application will be further described below through a specific example.

[0116] Taking a DC charging system with a rated power of 360kW as an example, the controller receives the input limit power P from the cloud via the LCS. limit =300kW. The controller can pre-store the initial power conversion efficiency (94.50%), power consumption parameters (1.42), and preset range [0, 1.5]kW of the charging system. Further, the controller sends an acquisition request to each power module, and each power module reports its current input power. After receiving the current input power of each power module, the controller sums all the current input powers to obtain the current input power of the charging system as 268.872kW.

[0117] Furthermore, the controller can substitute the system rated power, input limit power, initial power conversion efficiency, and power consumption parameters into the calculation formula for the initial power limit point to calculate the initial power limit point: f(x0)=(300-1.42)*9450 / (360*10000)=0.78377, and the initial power limit point is 0.78377; the controller then sends this initial power limit point to each power module for execution.

[0118] After waiting for a first preset time (approximately 10 seconds), the controller sends an acquisition request to each power module again, and each power module reports its current input power. After receiving the current input power of each power module, the controller sums up all the current input powers to obtain the current input power of the charging system. After the controller performs smoothing filtering on the current input power of the charging system, the current input power of the charging system is obtained as 291.87kW.

[0119] Furthermore, the difference between the current input power and the input limit power of the charging system is calculated to obtain the power difference value P. diff =8.13kW. The controller determines that the power difference is not within the preset range. Therefore, it retrieves the corresponding adjustment parameter from the preset correspondence table between power difference and adjustment parameter based on the power difference. The adjustment parameter is 8.75. Substituting the adjustment parameter, power difference, initial power conversion efficiency, and rated power into the calculation formula for the current power conversion efficiency, η1 = (9450 + (8.13 * 8.75 * 100) / 360) = 9469, that is, the current power conversion efficiency is 94.69%.

[0120] After obtaining the current power conversion efficiency, the controller substitutes it into the power limit point calculation formula: f(x1)=(300-1.42)*η1 / (360*10000)=0.7853, meaning the new power limit point is 0.7853. The controller then distributes the new power limit point to each power module for execution.

[0121] After waiting for a second preset time (approximately 3 seconds), the controller sends an acquisition request to each power module again, and each power module reports its current input power. After receiving the current input power of each power module, the controller sums up all the current input powers to obtain the current input power of the charging system. After the controller performs smoothing filtering on the current input power of the charging system, the current input power of the charging system is obtained as 298.03kW.

[0122] Furthermore, the difference between the current input power and the input limit power of the charging system is calculated to obtain the power difference value P. diff=1.96kW. The controller determines that the power difference is still not within the preset range. Therefore, it retrieves the corresponding adjustment parameter from the preset correspondence table between power difference and adjustment parameter based on the power difference. The adjustment parameter is 12.75. Substituting the adjustment parameter, power difference, initial power conversion efficiency, and rated power into the calculation formula for the current power conversion efficiency, η2 = (9469 + (1.96 * 12.75 * 100) / 360) = 9476, that is, the current power conversion efficiency is 94.76%.

[0123] After obtaining the current power conversion efficiency, the controller substitutes it into the power limit point calculation formula: f(x2)=(300-1.42)*η2 / (360*10000)=0.7859, meaning the new power limit point is 0.7859. The controller then distributes the new power limit point to each power module for execution.

[0124] The controller continuously executes the above power limit point update process in a loop until the power difference between the current input power and the input limit power of the charging system is within [0, 1.5] kW, and the current input power of the charging system is less than or equal to the input limit power, then it exits the adjustment and update process.

[0125] Figure 7 This is a power limitation trend chart of a specific example from this application. For example... Figure 7 As shown, when the input power limit is 300kW, the current input power of the charging system is gradually adjusted and updated by multiple adjustments to the power limit point, so that the current input power of the charging system gradually approaches 300kW. It should be noted that... Figure 7 The error in the power analysis is the difference between the current input power detected by the power analyzer and the current input power obtained by the controller through power module reporting and other means.

[0126] During the testing phase, a power analyzer can be connected to the input of the charging system to monitor the adjustment process in real time, record the adjustment data, and statistically analyze the results of multiple adjustments, as shown in Table 1. The analysis results show that the power difference between the current input power and the input limit power of the charging system is controlled within 1.5kW, effectively avoiding power waste.

[0127] Table 1 Power Limitation Analysis Table

[0128]

[0129] Therefore, the input power of the charging system is limited through software programs, without being restricted by system type or hardware, thus reducing the cost of the charging system. Furthermore, through the interaction between the controller and the charging module in the charging system, the controller continuously adjusts the power limit point of the charging module to adjust the current input power of the charging system. This gradually brings the current input power of the charging system closer to the required input limit power. After multiple adjustments, the current input power of the charging system reaches the input limit power, improving the accuracy and precision of the charging system in limiting the input power and better meeting customer needs.

[0130] Based on the above embodiments, this application also provides a power limiting device for a charging system. Figure 8 This is a schematic diagram of a power limiting device for a charging system according to an embodiment of this application.

[0131] like Figure 8 As shown, the charging system power limiting device 800 may include an acquisition module 810 and an update module 820. The acquisition module 810 is used to acquire the input limit power and the current input power of the charging system. The update module 820 is used to send power limit data to each power module based on the input limit power and the current input power to adjust the current input power of the charging system. The update process is executed multiple times until a preset condition is met. In each update process, the power limit data is re-determined based on the adjusted current input power and input limit power of the charging system, and the current input power of the charging system is adjusted again based on the re-determined power limit data. The preset condition includes that the power difference between the current input power and the input limit power of the charging system is within a preset range.

[0132] In some implementations, the update module 820 is specifically used to: determine the current power conversion efficiency of the charging system based on the input limit power and the current input power; determine the power limit data based on the input limit power and the current power conversion efficiency, and send the power limit data to each power module; the power limit data is used to adjust the current output power of the power module, so as to adjust the current input power of the charging system based on the current output power of each power module.

[0133] In some implementations, the update module 820 is further specifically used to: determine the power difference between the input limit power and the current input power, and determine the adjustment parameter based on the power difference; and determine the current power conversion efficiency of the charging system based on the initial power conversion efficiency of the charging system, the power difference, the adjustment parameter, and the rated power of the charging system.

[0134] In some implementations, the update module 820 is also specifically used to: determine the power limit data using a preset formula and based on the input power limit of the charging system, the current power conversion efficiency, power consumption parameters, and the rated power.

[0135] In some implementations, the update module 820 is further specifically used to: determine the power difference between the current input power and the input limit power of the adjusted charging system; if the power difference between the current input power and the input limit power of the adjusted charging system is within a preset range, then the update process ends; if the power difference between the current input power and the input limit power of the adjusted charging system is not within a preset range, then the power limit data is re-determined based on the current input power and the input limit power of the adjusted charging system.

[0136] In some implementations, the acquisition module 810 is specifically used to: acquire the input limit power of the charging system, and determine the initial power limit data based on the input limit power of the charging system, the initial power conversion efficiency, the power consumption parameters and the rated power; send the initial power limit data to each power module for execution; and acquire the current input power of the charging system after a first preset time period.

[0137] In some implementations, the acquisition module 810 is further specifically used to: receive the current input power sent by each power module, and determine the current input power of the charging system based on the current input power of each power module; or, collect the current input power of the charging system from the meter corresponding to the charging system.

[0138] In some implementations, the acquisition module 810 is also specifically used to: filter the current input power of the charging system.

[0139] Therefore, the input limit power and current input power of the charging system are obtained by the acquisition module 810; the update module 820 then determines the power limit data based on the input limit power and current input power, and sends the power limit data to each power module, so that the power module adjusts its current output power based on the power limit data, thereby realizing feedback adjustment of the current input power of the power module, and thus realizing adjustment of the current input power of the charging system; by repeatedly executing the power limit data update process, the current input power of the charging system gradually approaches the input limit power, until the power difference between the current input power and the input limit power of the charging system is within a preset range, thereby improving the accuracy and precision of the charging system in limiting the input power.

[0140] It should be noted that for details not disclosed in the charging system power limiting device of this embodiment, please refer to the details disclosed in the embodiments of the charging system power limiting method in this specification, which will not be repeated here.

[0141] Based on the above embodiments, this application also provides a controller. Figure 9 An example of a schematic diagram of the physical structure of a controller is shown, such as... Figure 9As shown, the controller may include a processor 99, a communication interface 920, a memory 930, and a communication bus 940. The processor 99, communication interface 920, and memory 930 communicate with each other via the communication bus 940. The processor 99 can call logic instructions in the memory 930 to execute a charging system power limiting method. This method includes: acquiring the input limit power and current input power of the charging system; issuing power limiting data to each power module based on the input limit power and current input power to adjust the current input power of the charging system; executing an update process multiple times until a preset condition is met; wherein, during each update process, the power limiting data is re-determined based on the adjusted current input power and input limit power of the charging system, and the current input power of the charging system is adjusted again based on the re-determined power limiting data; the preset condition includes that the power difference between the current input power and the input limit power of the charging system is within a preset range.

[0142] Furthermore, the logical instructions in the aforementioned memory 930 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, essentially, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0143] Based on the above embodiments, the present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon. When executed by a processor, the computer program implements the charging system power limiting method provided by the above methods. The method includes: acquiring the input limiting power and the current input power of the charging system; issuing power limiting data to each power module based on the input limiting power and the current input power to adjust the current input power of the charging system; performing an update process multiple times until a preset condition is met; wherein, in each update process, the power limiting data is re-determined based on the adjusted current input power and the input limiting power of the charging system, and the current input power of the charging system is adjusted again based on the re-determined power limiting data; the preset condition includes that the power difference between the current input power and the input limiting power of the charging system is within a preset range.

[0144] Based on the above embodiments, the present invention also provides a charging system, including a controller as described in the above embodiments and at least one power module.

[0145] The controller acquires the input limit power and the current input power of the charging system, and sends power limit data to each power module based on the input limit power and the current input power. The power modules adjust their current output power based on the power limit data to provide feedback on adjusting the current input power of the charging system. The controller also executes the update process multiple times until preset conditions are met. During each update process, the power limit data is re-determined based on the adjusted current input power and input limit power of the charging system, and the current input power of the charging system is adjusted again based on the re-determined power limit data. The preset conditions include that the power difference between the current input power and the input limit power of the charging system is within a preset range.

[0146] In this embodiment, the controller can obtain the input limit power from an external device or platform, such as a host computer, cloud platform, server, or any hardware device or software capable of obtaining and distributing the input limit power. If the input limit power is obtained from the cloud / server, it can be directly sent to the controller; if it is obtained from the host computer, the input limit power can be set directly on the host computer by the operator.

[0147] It should be noted that for details not disclosed in the charging system of this embodiment, please refer to the details disclosed in the embodiments of the charging system power limiting method in this specification, which will not be repeated here.

[0148] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0149] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0150] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A power limiting method for a charging system, characterized in that, The charging system includes at least one power module, and the method includes: Obtain the input power limit and current input power of the charging system; Determine the power difference between the input limit power and the current input power, and determine the adjustment parameters based on the power difference; The current power conversion efficiency of the charging system is determined based on the initial power conversion efficiency of the charging system, the power difference, the adjustment parameters, and the rated power of the charging system. Based on the input power limit and the current power conversion efficiency, a power limit data is determined and the power limit data is sent to each of the power modules; the power limit data is used to adjust the current output power of the power modules, so as to adjust the current input power of the charging system based on the current output power of each power module. The update process is executed multiple times until the preset conditions are met; In each update process, the power limit data is re-determined based on the current input power of the adjusted charging system and the input limit power, and the current input power of the charging system is adjusted again based on the re-determined power limit data; the preset condition includes that the power difference between the current input power of the charging system and the input limit power is within a preset range.

2. The power limiting method for a charging system according to claim 1, characterized in that, After performing the update process, the method further includes: The power difference between the current input power of the charging system and the input limit power is determined; wherein the power difference gradually decreases during multiple updates.

3. The power limiting method for a charging system according to claim 1, characterized in that, The determination of power limiting data based on the input power limit and the current power conversion efficiency includes: The power limit data is determined using a preset formula and based on the input power limit of the charging system, the current power conversion efficiency, power consumption parameters, and the rated power.

4. The power limiting method for a charging system according to claim 1, characterized in that, After each adjustment of the current input power of the charging system, the method further includes: Determine the power difference between the current input power of the adjusted charging system and the input limit power; If the power difference between the current input power of the adjusted charging system and the input limit power is within the preset range, the update process ends. If the power difference between the current input power of the adjusted charging system and the input limit power is not within the preset range, then the update process is executed.

5. The power limiting method for a charging system according to claim 1, characterized in that, The acquisition of the input limit power and current input power of the charging system includes: Obtain the input limit power of the charging system, and determine the initial power limit data based on the input limit power, initial power conversion efficiency, power consumption parameters and rated power of the charging system; The initial power limit data is sent to each of the power modules for execution. After a first preset time period, the current input power of the charging system is obtained.

6. The power limiting method for a charging system according to claim 5, characterized in that, The step of obtaining the current input power of the charging system includes: Receive the current input power sent by each of the power modules, and determine the current input power of the charging system based on the current input power of each power module; or, The current input power of the charging system is collected from the electricity meter corresponding to the charging system.

7. The power limiting method for a charging system according to any one of claims 1-6, characterized in that, After obtaining the input limit power of the charging system and the current input power, the method further includes: The current input power of the charging system is filtered. The step of sending power limiting data to each of the power modules based on the input power limit and the current input power to adjust the current input power of the charging system includes: Based on the input power limit and the filtered current input power, power limit data is sent to each of the power modules to adjust the current input power of the charging system.

8. A controller comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the charging system power limiting method as described in any one of claims 1 to 7.

9. A charging system, characterized in that, Includes the controller as described in claim 8 and at least one power module; The controller is used to acquire the input limit power and the current input power of the charging system, determine the power difference between the input limit power and the current input power, and determine the adjustment parameter based on the power difference; determine the current power conversion efficiency of the charging system based on the initial power conversion efficiency of the charging system, the power difference, the adjustment parameter, and the rated power of the charging system; determine the power limit data based on the input limit power and the current power conversion efficiency, and send the power limit data to each of the power modules; The power module is used to adjust the current output power based on the power limit data, so as to provide feedback to adjust the current input power of the charging system; The controller is also used to perform the update process multiple times until a preset condition is met; wherein, in each update process, the power limit data is re-determined based on the current input power of the adjusted charging system and the input limit power, and the current input power of the charging system is adjusted again based on the re-determined power limit data; the preset condition includes that the power difference between the current input power of the charging system and the input limit power is within a preset range.

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