Charging method and device of charging pile, readable storage medium and electronic equipment

Abstract

The application provides a charging method and device of a charging stack, a readable storage medium and an electronic device, the charging stack comprising a switch array and a DCDC power module connected electrically, the DCDC power module comprising a plurality of power sub-modules, the method comprising: obtaining a charging voltage and a charging current of an electric vehicle; determining a series number of corresponding power sub-modules according to the charging voltage of the electric vehicle, and determining a parallel number of corresponding power sub-modules according to the charging current of the electric vehicle; determining the opening and closing of each switch device according to the series number of the power sub-modules and the parallel number of the power sub-modules, so as to determine the connection mode of each power sub-module in the DCDC power module, and to charge the electric vehicle. The method connects the flexible switch array to the input end and the output end of the DCDC power module respectively, realizes the dynamic reconfiguration of the series-parallel connection mode between the modules, and effectively improves the flexibility of the system.

Description

Technical Field

[0001] This application relates to the field of charge stack control, and more specifically, to a charging method for a charge stack, a charging device for a charge stack, a computer-readable storage medium, and an electronic device. Background Technology

[0002] Traditional charging piles have fixed power outputs, making it difficult to accommodate various vehicle models. If the charging pile is designed with too high a power output, the power module capacity utilization is low, resulting in waste; if it's too low, the charging speed will be reduced. Charging stacks, on the other hand, integrate the power modules of many charging piles, simultaneously supplying power to multiple charging guns. The number of power modules can be flexibly allocated according to the actual needs of various vehicles, meeting the different power requirements of various models and improving the utilization rate of the power modules. Furthermore, as the charging power of electric vehicles increases, charging stacks also feature upward power compatibility, enabling flexible expansion of electric vehicle charging stations by connecting power modules.

[0003] Currently, the mainstream electric vehicle (EV) power battery voltage levels are mainly 330V, 400V, 500V, and 800V. Considering the voltage difference between full charge and discharge, a single charging gun for an EV needs to provide a wide voltage output of 150-1000V to achieve compatibility with charging EVs of all voltage levels. Furthermore, EV charging is divided into high-voltage, low-current fast charging schemes and low-voltage, high-current fast charging schemes. This also requires the charging station's single gun to have a wide current output capability to be compatible with various types of EV charging. Currently, the peak output current of a single gun in a liquid-cooled charging station has reached 600A.

[0004] The charging power section of an electric vehicle (EV) typically consists of several DC-DC power modules connected in parallel to form a charging pile. The module power ratings are generally 20kW, 30kW, or 40kW. Existing technologies calculate the number of DC-DC modules to be deployed by detecting the EV's charging demand, and then connect the modules in parallel to meet the EV's charging current requirements, thereby satisfying the charging power requirements. Since the modules are only connected in parallel and not in series, the charging voltage adjustment of the charging pile depends on the wide voltage regulation capability of the DC-DC modules themselves, depending on the vehicle's voltage level. This requires the converter to operate over a wide range, resulting in complex converter parameter design and lower efficiency under light loads.

[0005] Therefore, existing technologies only use parallel switching of power modules to meet the charging needs of different electric vehicles, which has the disadvantages of poor flexibility, high requirements for wide voltage regulation capability of single modules, and low efficiency when the modules are lightly loaded. Summary of the Invention

[0006] The main objective of this application is to provide a charging method for a charging pile, a charging device for a charging pile, a computer-readable storage medium, and an electronic device, so as to at least solve the problems of the prior art, which only uses the parallel switching of power modules to meet the charging needs of different electric vehicles, resulting in poor flexibility, high requirements for wide voltage regulation capability of single modules, and low efficiency when the modules are lightly loaded.

[0007] To achieve the above objectives, according to one aspect of this application, a charging method for a charging pile is provided. The charging pile includes an electrically connected switch array and a DC-DC power module. The switch array includes multiple switching devices, and the DC-DC power module includes multiple power sub-modules. Each switching device is used to control the connection mode of each power sub-module. The method includes: acquiring the charging voltage and charging current of an electric vehicle; determining the number of power sub-modules connected in series according to the charging voltage of the electric vehicle, and determining the number of power sub-modules connected in parallel according to the charging current of the electric vehicle; determining the opening and closing of each switching device according to the number of power sub-modules connected in series and the number of power sub-modules connected in parallel, thereby determining the connection mode of each power sub-module in the DC-DC power module to charge the electric vehicle.

[0008] Optionally, the switch array includes an input switch array and an output switch array. The input switch array and the output switch array each include multiple parallel switching devices and multiple series switching devices. Determining the number of power sub-modules connected in series according to the charging voltage of the electric vehicle and determining the number of power sub-modules connected in parallel according to the charging current of the electric vehicle includes: obtaining a first mapping relationship and a second mapping relationship. The first mapping relationship is a mapping relationship between the charging voltage of the electric vehicle and the number of power sub-modules connected in series at the output terminal of the DC-DC power module. The second mapping relationship is a mapping relationship between the charging current of the electric vehicle and the number of power sub-modules connected in parallel at the output terminal of the DC-DC power module. The first mapping relationship is a positive correlation. Based on the charging voltage of the electric vehicle and the first mapping relationship, the number of power sub-modules connected in series at the output terminal of the DC-DC power module is determined. Based on the charging current of the electric vehicle and the second mapping relationship, the number of power sub-modules connected in parallel at the output terminal of the DC-DC power module is determined.

[0009] Optionally, determining the number of power submodules connected in series based on the charging voltage of the electric vehicle includes: determining the output voltage of one power submodule based on the number of power submodules connected in parallel with the output terminal of the DC-DC power module according to the charging voltage of the electric vehicle; and determining the number of power submodules connected in series with the input terminal of the DC-DC power module based on the DC voltage value provided by the DC bus of the charging pile and the output voltage of one power submodule, so that the difference between the input voltage and the output voltage of the power submodule is within a preset difference range.

[0010] Optionally, the power submodule is a dual active full-bridge circuit. After determining the connection method of each power submodule in the DC-DC power module, the method further includes: determining a voltage regulation shift ratio based on a module voltage regulator loop, wherein the module voltage regulator loop is used to control the output voltage of the DC-DC power module within a preset voltage range; determining a current sharing shift ratio based on a module current sharing loop, wherein the module current sharing loop is used to control the current of each power submodule connected in parallel to be the same; determining a voltage sharing shift ratio based on a module voltage equalization loop, wherein the module voltage equalization loop is used to control the voltage of each power submodule connected in series to be the same; determining the sum of the voltage regulation shift ratio, the current equalization shift ratio, and the voltage equalization shift ratio as the total shift ratio of the power submodule; and using the limited total shift ratio to perform single-phase shift modulation on the transistors in the power submodule to control the operation of the power submodule.

[0011] Optionally, determining the voltage regulation shift ratio based on the module voltage regulator loop includes: determining the difference between the actual system output voltage and the system output voltage reference value as a first difference value, wherein the actual system output voltage is the voltage actually output by the charging pile; adjusting the first difference value using a PI regulator to obtain a first adjustment value, and limiting the first adjustment value to obtain the voltage regulation shift ratio.

[0012] Optionally, determining the current shift ratio based on the module current sharing loop includes: obtaining the number of parallel branches x at the input terminal of the DC-DC power module and the actual system input current, wherein the actual system input current is the current actually input to the input terminal of the DC-DC power module; determining the actual system input current after 1 / x gain as a module input current reference value; determining the difference between the module input current reference value and the module actual input current as a second difference value; adjusting the second difference value using a PI regulator to obtain a second adjustment value, and limiting the second adjustment value to obtain the current shift ratio.

[0013] Optionally, determining the voltage equalization shift ratio based on the module equalization loop includes: obtaining the number y of the power sub-modules connected in series on a parallel branch of the input terminal of the DC-DC power module and the actual system input voltage, wherein the actual system input voltage is the voltage actually input to the input terminal of the DC-DC power module; determining the actual system input voltage after 1 / y gain as the module input voltage reference value; determining the difference between the module input voltage reference value and the module actual input voltage as a third difference value; adjusting the third difference value using a PI regulator to obtain a third adjustment value, and limiting the third adjustment value to obtain the voltage equalization shift ratio.

[0014] According to another aspect of this application, a charging device for a charging pile is provided. The charging pile includes an electrically connected switch array and a DC-DC power module. The switch array includes multiple switching devices, and the DC-DC power module includes multiple power sub-modules. Each switching device is used to control the connection mode of each power sub-module. The device includes: an acquisition unit for acquiring the charging voltage and charging current of an electric vehicle; a first determination unit for determining the number of power sub-modules connected in series based on the charging voltage of the electric vehicle, and determining the number of power sub-modules connected in parallel based on the charging current of the electric vehicle; and a second determination unit for determining the opening and closing of each switching device based on the number of power sub-modules connected in series and the number of power sub-modules connected in parallel, so as to determine the connection mode of each power sub-module in the DC-DC power module for charging the electric vehicle.

[0015] According to another aspect of this application, a computer-readable storage medium is provided, the computer-readable storage medium including a stored program, wherein, when the program is executed, it controls the device where the computer-readable storage medium is located to perform any of the charging methods of the charging pile described above.

[0016] According to another aspect of this application, an electronic device is provided, comprising: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including a charging method for performing any of the described charging piles.

[0017] Applying the technical solution of this application, the charging method of the aforementioned charging pile includes an electrically connected switch array and a DC-DC power module. The DC-DC power module includes multiple power sub-modules. The method includes: acquiring the charging voltage and charging current of the electric vehicle; determining the number of power sub-modules connected in series according to the charging voltage of the electric vehicle, and determining the number of power sub-modules connected in parallel according to the charging current of the electric vehicle; determining the opening and closing of each switching device according to the number of power sub-modules connected in series and in parallel, thereby determining the connection mode of each power sub-module in the DC-DC power module for charging the electric vehicle. This method connects flexible switch arrays to the input and output terminals of the DC-DC power module respectively, realizing dynamic reconfigurability of series and parallel connections between modules. For the charging voltage and current requirements of different electric vehicles, the number of modules to be connected and the connection mode of the input / output terminals between modules are calculated, and then the switch array is controlled to realize circuit reconfiguration, effectively improving the system flexibility. The number of modules connected in parallel changes the current, and the number of modules connected in series changes the voltage. Introducing series reconfiguration can avoid large-range voltage regulation of modules and simplify the design of power modules. Meanwhile, matching the input and output connection methods between modules aims to control the voltage gain of the modules within the optimal range, thereby allowing the modules to operate near their peak efficiency point. This solves the problems of existing technologies that only use parallel switching of power modules to meet the charging needs of different electric vehicles, resulting in poor flexibility, high requirements for wide voltage regulation capability of single modules, and low efficiency when the modules are operating under light load. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0019] Figure 1 A hardware structure block diagram of a mobile terminal performing a charging method for a charging pile according to an embodiment of this application is shown.

[0020] Figure 2 A schematic flowchart of a charging method for a charging pile according to an embodiment of this application is shown;

[0021] Figure 3 A diagram of an electric vehicle charging station grid using a charging pile is shown according to an embodiment of this application;

[0022] Figure 4 A circuit topology diagram of a DC-DC converter section of a charging pile provided according to an embodiment of this application is shown;

[0023] Figure 5 A schematic diagram of a power module control strategy provided according to an embodiment of this application is shown;

[0024] Figure 6 The diagram shows a simulated output voltage waveform of each power submodule according to an embodiment of this application;

[0025] Figure 7 The diagram shows a simulated output current waveform of each power submodule according to an embodiment of this application;

[0026] Figure 8 The diagram shows the charging voltage and current waveforms output by a charging gun 1 according to an embodiment of this application;

[0027] Figure 9 The diagram shows the charging voltage and current waveforms output by a charging gun 2 according to an embodiment of this application;

[0028] Figure 10 A structural block diagram of a charging device for a charging pile according to an embodiment of this application is shown.

[0029] The above figures include the following reference numerals:

[0030] 01. AC power grid; 02. Power frequency transformer; 03. AC-DC; 04. DC bus; 05. Charging pile; 051. DC-DC power module; 052. Charging gun; 053. Input switch array; 054. Output switch array; 06. Electric vehicle; 102. Processor; 104. Memory; 106. Transmission equipment; 108. Input / output device. Detailed Implementation

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0033] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0034] For ease of description, the following explains some of the nouns or terms used in the embodiments of this application:

[0035] DC-DC converter: Used to convert a fixed DC voltage into a variable DC voltage, also known as a DCDC converter;

[0036] AC-DC converter: Used to convert alternating current (AC) to direct current (DC), also known as ACDC converter.

[0037] As described in the background section, existing technologies only use parallel switching of power modules to meet the charging needs of different electric vehicles, which has the disadvantages of poor flexibility, high requirements for wide voltage regulation capability of single modules, and low efficiency when the modules are lightly loaded. In order to solve the problems of poor flexibility, high requirements for wide voltage regulation capability of single modules, and low efficiency when the modules are lightly loaded, the embodiments of this application provide a charging method for a charging pile, a charging device for a charging pile, a computer-readable storage medium, and an electronic device.

[0038] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0039] The methods and embodiments provided in this application can be executed on a mobile terminal, computer terminal, or similar computing device. Taking running on a mobile terminal as an example, Figure 1 This is a hardware structure block diagram of a mobile terminal for a charging method of a charging pile according to an embodiment of the present invention. Figure 1 As shown, a mobile terminal may include one or more ( Figure 1 Only one is shown in the diagram. A processor 102 (which may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.) and a memory 104 for storing data are also shown. The mobile terminal may further include a transmission device 106 for communication functions and an input / output device 108. Those skilled in the art will understand that... Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the mobile terminal described above. For example, the mobile terminal may also include components that are more... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown.

[0040] The memory 104 can be used to store computer programs, such as application software programs and modules, like the computer program corresponding to the charging method of the charging pile in this embodiment of the invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, thereby implementing the above-described method. The memory 104 may include high-speed random access memory and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of the above-described networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof. The transmission device 106 is used to receive or send data via a network. Specific examples of the above-described networks may include wireless networks provided by the mobile terminal's communication provider. In one example, the transmission device 106 includes a network interface controller (NIC), which can be connected to other network devices via a base station to communicate with the Internet. In one example, the transmission device 106 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0041] This embodiment provides a charging method for a charging stack that operates on a mobile terminal, computer terminal, or similar computing device. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0042] Figure 2 This is a flowchart of a charging method for a charging pile according to an embodiment of this application. The charging pile includes an electrically connected switch array and a DC-DC power module. The switch array includes multiple switching devices, and the DC-DC power module includes multiple power sub-modules. Each of the switching devices is used to control the connection mode of each of the power sub-modules, such as... Figure 2 As shown, the method includes the following steps:

[0043] Step S201: Obtain the charging voltage and charging current of the electric vehicle;

[0044] Specifically, in electric vehicle charging stations with a common DC bus, a reconfigurable DC-DC converter is used to supply power to multiple charging guns. After detecting that an electric vehicle has connected to a charging gun and obtaining the electric vehicle's charging information (charging voltage and charging current) through communication, the number of connected modules is determined. With the optimization goal of making the modules operate near their optimal efficiency point, the switch array adjusts the series and parallel connections between the modules to meet the voltage and current requirements of vehicle charging. Finally, the charging guns are connected to achieve a reasonable allocation of charging pile modules.

[0045] in, Figure 3 A grid diagram of an electric vehicle charging station using charging piles, such as Figure 3 As shown, the AC grid 01 first adjusts the AC voltage through the power frequency transformer 02, and the AC-DC converter 03 rectifies the AC power to the DC voltage value set by the DC bus. Inside the charging pile 05, the DC bus 04 and the charging gun 052 are connected through the DC-DC power module 051, ultimately adjusting the electrical energy to the voltage and current required for charging the electric vehicle 06. Compared with integrated charging piles sharing an AC bus, this architecture is more cost-effective, smaller, more flexible, and has better dynamic performance. It also has less impact on the AC grid, a simpler converter control strategy, and higher system efficiency.

[0046] Step S202: Determine the number of power sub-modules connected in series according to the charging voltage of the electric vehicle, and determine the number of power sub-modules connected in parallel according to the charging current of the electric vehicle.

[0047] Specifically, the number of power submodules connected in parallel changes the current, and the output of power submodules connected in series changes the voltage. Introducing series reconfiguration can avoid large-range voltage regulation of the module and simplify the design of the power module.

[0048] Among them, such as Figure 4As shown, the DC-DC module uses a dual-active bridge (DAB) circuit. Other circuit topologies, such as LLC resonant circuits, can also be used for the DC-DC power module. For power module selection, based on the advantages and disadvantages of various converters and their applicable scenarios, combined with the applicable scenarios of the charging pile and the charging vehicle, an isolated DC-DC converter can be selected as the basic DC-DC power module for the reconfigurable flexible charging pile. Among them, the dual-active bridge converter has advantages such as bidirectional flow capability, easy soft-switching implementation, high modularity, and fast dynamic response, and is considered the most suitable core circuit for medium- and high-voltage, large-capacity DC transformers. The DAB input and output terminals are respectively connected to flexible switch arrays, and the control switches can change the series-parallel connection mode between adjacent DAB modules. The input flexible switch array is connected to the DC bus, and the output flexible switch array is connected to the charging gun. Each charging gun needs to be equipped with a set of switch arrays, and each set of switch arrays is connected to the DC-DC module in parallel. The switches in the switch arrays can be simplified according to the actual operating conditions. Ignoring the differences between power modules, each power module's input terminal corresponds to three switches: two parallel switches and one series switch. The parallel switches enable parallel connection between the power module and the DC bus, while the series switch enables series connection between two adjacent power modules. The output terminal follows the same principle. During converter reconfiguration, the upper-level command first issues the circuit topology requirements, and then the switch array operates according to the command, connecting the power modules according to the required series-parallel architecture, thus achieving converter circuit reconfiguration.

[0049] like Figure 4 As shown, the aforementioned switch array includes an input switch array 053 and an output switch array 054. The input switch array 053 and the output switch array 054 each include multiple parallel switching devices and multiple series switching devices. The number of power sub-modules connected in series is determined based on the charging voltage of the electric vehicle, and the number of power sub-modules connected in parallel is determined based on the charging current of the electric vehicle. This process includes the following steps:

[0050] Step S301: Obtain a first mapping relationship and a second mapping relationship. The first mapping relationship is the mapping relationship between the charging voltage of the electric vehicle and the number of power sub-modules connected in series at the output terminal of the DC-DC power module. The second mapping relationship is the mapping relationship between the charging current of the electric vehicle and the number of power sub-modules connected in parallel at the output terminal of the DC-DC power module. The first mapping relationship is a positive correlation.

[0051] Step S302: Based on the charging voltage of the electric vehicle and the first mapping relationship, determine the number of power sub-modules connected in series at the output terminal of the DC-DC power module, and based on the charging current of the electric vehicle and the second mapping relationship, determine the number of power sub-modules connected in parallel at the output terminal of the DC-DC power module.

[0052] Specifically, flexible switch arrays are connected to the input and output terminals of the power module to achieve dynamic reconfigurability of series and parallel connections between modules. For the charging voltage and current requirements of different electric vehicles, the number of power sub-modules to be deployed and the connection methods of their input / output terminals are calculated. Then, the switch arrays are controlled to achieve circuit reconfiguration, effectively improving the system's flexibility. The number of power sub-modules connected in parallel changes the current, while the series output changes the voltage. Introducing series reconfiguration avoids large-range voltage regulation of the modules and simplifies the power module design. Simultaneously, matching the input and output connection methods between sub-modules aims to control the module's voltage gain within the optimal range, allowing the module to operate near its peak efficiency point.

[0053] The process of determining the number of power sub-modules connected in series based on the charging voltage of the electric vehicle further includes the following steps:

[0054] Step S401: Determine the voltage at the output terminal of one of the power sub-modules based on the number of power sub-modules connected in parallel with the charging voltage of the electric vehicle and the output terminal of the DC-DC power module.

[0055] Step S402: Based on the DC voltage value provided by the DC bus of the charging pile and the voltage at the output terminal of the power sub-module, determine the number of power sub-modules connected in series at the input terminal of the DC-DC power module, so that the difference between the input terminal voltage and the output terminal voltage of the power sub-module is within a preset difference range.

[0056] Specifically, the input and output connection methods between power submodules are matched to control the voltage gain of the power submodules within the optimal range, thereby allowing the power submodules to operate near their peak efficiency point.

[0057] The logic for determining the connection method between power submodules is as follows: first determine the connection method of the power submodule output terminals, and then determine the connection method of the power submodule input terminals. The output terminal connection method depends on the charging voltage and current of the connected electric vehicle (the basic principle is high voltage - series, high current - parallel). The connection method of the power submodule input terminals should consider the bus voltage level and the number of modules connected, and ensure that the input voltage and output voltage of a single module are matched as much as possible. The purpose is to allow the single module to operate near the optimal voltage gain, thereby improving efficiency.

[0058] Step S203: Based on the number of power sub-modules connected in series and the number of power sub-modules connected in parallel, determine the opening and closing of each of the switching devices to determine the connection method of each of the power sub-modules in the DC-DC power module, so as to charge the electric vehicle.

[0059] Specifically, based on the charging voltage and current requirements of different electric vehicles, the number of modules to be put into operation and the connection method of the input / output terminals between modules are calculated. Then, the switch array is controlled to realize circuit reconfiguration, which effectively improves the flexibility of the system.

[0060] In addition, when other electric vehicles join the charging process, the number of modules to be connected is selected from the idle power modules, and the corresponding switch array is then reconfigured according to the charging information of the newly added electric vehicles to reconstruct the series and parallel connection mode of the modules.

[0061] In some embodiments, control is divided into two levels: control of the switch array and control of the power submodules. For the control of the switch array, upon detecting vehicle charging information, the upper-level control system determines the number of power submodules activated and their series-parallel connection method, and then issues switch array action commands to implement the corresponding connection method. The power module adopts... Figure 5 The control strategy shown consists of three parts: the system output voltage regulation loop (module voltage regulation loop), the module current sharing loop, and the module voltage sharing loop.

[0062] The control strategy adopted by the power module is based on achieving the following two control objectives: 1) From the system level, it is necessary to ensure stable output voltage to achieve stable power supply to electric vehicles; 2) For the charging pile, since electric vehicles are charged simultaneously through several modules, it is necessary to control the power transmission balance between modules. For parallel modules, since the voltage of parallel ports is naturally equal, it is necessary to control the port current of each module to be equal to achieve power balance. Similarly, for series modules, since the port current is naturally equal, it is necessary to control the port voltage of the modules to be equal.

[0063] Based on the above analysis of the control objectives, the control of the power module is divided into output voltage control and inter-module equalization control, corresponding to the two control objectives mentioned above. Therefore, voltage regulation control and equalization control are performed simultaneously. Among them, the inter-module equalization control needs to select current equalization control or voltage equalization control, or both, depending on the series and parallel relationship of the modules.

[0064] In addition, when the trolley is being charged with high voltage and low current, the modules should be connected in series for power supply, and voltage balance control should be used for module balancing control. When the trolley is being charged with low voltage and high current, the modules should be connected in parallel for power supply, and current balance control should be used for module balancing control.

[0065] In some embodiments, such as Figure 4As shown, each power module's output terminal corresponds to three switches: two parallel switches and one series switch. The parallel switches enable the power module and the electric vehicle to be connected in parallel, while the series switch enables two adjacent power modules to be connected in series. When modules need to be connected in series, the series switch is closed and the parallel switch is opened; the reverse is true when modules need to be connected in parallel.

[0066] The aforementioned power submodule is a dual active full-bridge circuit. After determining the connection method of each power submodule in the aforementioned DC-DC power module, the method further includes the following steps:

[0067] Step S501: Based on the voltage regulator loop, the voltage regulator shift ratio is determined. The voltage regulator loop is used to control the output voltage of the DC-DC power module within a preset voltage range.

[0068] The process of determining the voltage regulation shift based on the module's voltage regulator loop includes the following steps:

[0069] Step S5011: The difference between the actual system output voltage and the system output voltage reference value is determined as the first difference, wherein the actual system output voltage is the voltage actually output by the charging pile.

[0070] In step S5012, a PI controller is used to adjust the first difference to obtain a first adjustment value, and the first adjustment value is limited to obtain the voltage stabilization shift ratio.

[0071] Specifically, this ensures stable output voltage compared to the voltage regulation ratio, thereby achieving stable power supply for electric vehicles.

[0072] Step S502, based on the current sharing loop of the module, the current sharing loop of the module is used to control the current of each of the power sub-modules connected in parallel to be the same.

[0073] The method of determining the flow displacement based on the module flow sharing loop includes the following steps:

[0074] Step S5021: Obtain the number of parallel branches x at the input terminal of the DC-DC power module and the actual system input current. The actual system input current is the current actually input to the input terminal of the DC-DC power module.

[0075] Step S5022: Determine the actual input current of the above system after 1 / x gain as the reference value of the module input current;

[0076] Step S5023: Determine the difference between the above module input current reference value and the module actual input current as the second difference value;

[0077] Step S5024: The second difference is adjusted using a PI controller to obtain a second adjustment value, and the second adjustment value is limited to obtain the average flow ratio.

[0078] Specifically, this allows for equalization of current distribution, and enables control of the port currents of each parallel module to be equal, thereby achieving power balance.

[0079] Step S503: Based on the voltage equalization ring, the voltage equalization shift is determined. The voltage equalization ring is used to control the voltage of each of the power sub-modules connected in series to be the same.

[0080] The process of determining the voltage equalization shift based on the module voltage equalization ring includes the following steps:

[0081] Step S5031: Obtain the number y of the power sub-modules connected in series on a parallel branch of the input terminal of the DC-DC power module and the actual system input voltage. The actual system input voltage is the voltage actually input to the input terminal of the DC-DC power module.

[0082] Step S5032: Determine the actual input voltage of the above system after 1 / y gain as the module input voltage reference value;

[0083] Step S5033: The difference between the above module input voltage reference value and the actual module input voltage is determined as the third difference value;

[0084] Step S5034: The third difference is adjusted using a PI controller to obtain a third adjustment value, and the third adjustment value is limited to obtain the equal pressure shift ratio.

[0085] Specifically, this allows for equalization of voltage across the modules, ensuring that the port voltages of each module in the series are equal, thereby achieving power balance.

[0086] Step S504: The sum of the above voltage regulation shift ratio, the above current equalization shift ratio, and the above voltage equalization shift ratio is determined as the total shift ratio of the above power submodule;

[0087] Step S505: The transistors in the power submodule are subjected to single-phase shift modulation using the total phase shift after limiting, thereby controlling the operation of the power submodule.

[0088] Specifically, this ensures a stable output voltage, thereby providing a stable power supply to electric vehicles. Furthermore, since several modules within the charging station charge electric vehicles simultaneously, it is necessary to control the power transmission balance between these modules.

[0089] like Figure 5 As shown, the system output voltage regulation loop (module regulation loop) includes: the actual system output voltage V s_outand system output voltage reference value V s_out_ref The difference is limited by the PI regulator to generate a shift ratio d. s_v_out The module current sharing loop includes: Let x be the number of parallel branches at the input terminal, and the actual system input current I... s_in The module input current reference value is obtained after 1 / x gain, which is different from the actual module input current I. m_in The difference is limited by the PI regulator to generate a shift ratio d. b_i The module equalization loop includes: Let y be the number of series modules in each parallel branch at the input terminal, and the actual system input voltage V. s_in After 1 / y gain, the module input voltage reference value is obtained, which is different from the actual module input voltage V. m_in The difference is limited by the PI regulator to generate a shift ratio d. b_v .

[0090] Compared to d s_v_out d b_i d b_v The sum, after being limited, is used as the total phase shift ratio for single-phase modulation (SPSM), thereby driving the switches S1 to S8 within the module. The control objective of the module voltage / current sharing loop is the voltage / current at the module input terminals. Once voltage and current sharing are achieved at the input terminals of each module, voltage and current sharing is automatically achieved at the output terminals.

[0091] The following formula derivation proves the decoupling of equalization control and voltage regulation control:

[0092] The z-th module is moved relative to d. z It consists of three parts, of which d s_v_out_z Compared to the shift generated by the voltage regulator loop of the z-th module, d b_i_z Compared to the displacement generated by the current sharing loop of the z-th module, d b_v_z The shift ratio generated by the equalizing ring of the z-th module is shown in formula (1).

[0093] d z =d s_v_out_z +d b_i_z +d b_v_z (1)

[0094] Based on the relationship between input and output voltages and duty cycle, a disturbance equation is constructed, as shown in equation (2), where D and V are constants. m_in_z and V m_out_z For steady-state components; and For the disturbance component:

[0095]

[0096] By solving the equations of n modules simultaneously, we can obtain formula (3):

[0097]

[0098] In the formula, for a parallel input system, m1 = n; for a series input system, m1 = 1; for a parallel output system, m2 = n; and for a series output system, m2 = 1.

[0099] Analyzing the above equation, the decoupling condition is as shown in formula (4):

[0100]

[0101] The perturbation equation is transformed into formula (5):

[0102]

[0103] This proves that the output voltage change is only related to the shift ratio controlled by the output voltage.

[0104] Furthermore, when a power module malfunctions, all switches in the corresponding switch array are disconnected, and the module is no longer included in the reconfigurable circuit. This allows for online replacement of the power module without shutting down the charging pile, enabling rapid maintenance and repair. Power module failures are often caused by malfunctions in the power switching devices within the module. These failures are typically accompanied by sudden changes in port voltage and current. When the voltage and current signals sampled by the circuit's sampling module exhibit sudden changes, it indicates a module failure, and fault isolation measures should be implemented to clear the fault.

[0105] In some embodiments, the voltage range provided by the charging pile is 150V-1000V, and the current output range of a charging gun is 0-600A. Taking a system consisting of 12 DAB modules and 2 charging guns charging 2 EVs as an example, the boundary conditions are set as shown in Table 1.

[0106] Table 1 Boundary Conditions

[0107] DC bus voltage 400V Single charging gun output voltage range 150～1000V Maximum output current of a single charging gun 600A Maximum output current of a single module 200A Optimal voltage gain of a single module 1 Maximum output voltage of a single module 400V

[0108] The voltage and current boundary conditions limit the number of modules connected in parallel to 3 and the number connected in series to 3, which meets all the charging needs of the vehicle. A single charging gun can connect to 9 circuit modes (Ⅰ~IX) shown in Table 2, covering all electric vehicle charging voltage and current ranges. The table also indicates the connection method description; for example, the "2P×3S" connection method means two parallel branches, each with 3 modules connected in series, for a total of 6 modules. The module output connection method needs to match the corresponding input connection method to ensure that the single module operates near the optimal voltage gain, thereby improving efficiency.

[0109] Table 2 shows the connection method of the power module input and output terminals under a single charging gun in this example.

[0110]

[0111]

[0112] For the above embodiments, the charging scenarios are designed as shown in Table 3. Two charging guns are connected to multiple types of electric vehicles, and a total of 6 working condition combinations from A to F are designed.

[0113] Table 3 Charging Scenarios Design

[0114]

[0115]

[0116] The flexible charging pile in the above embodiments has wide voltage and current output capabilities, thus being compatible with charging various types of electric vehicles. The voltage and current of the electric vehicles connected to charging guns 1 and 2 are not limited.

[0117] The internal module connection method of the converter system is reconfigured in real time according to Table 2 to realize the electric vehicle charging combination from condition A to condition F in the charging scenario of Table 3. Simulation software is used to demonstrate the feasibility of the embodiment and verify the circuit reconfiguration and equalization effect. Figures 6-9 This is a schematic diagram of the corresponding simulation results.

[0118] like Figures 6-9 As shown, the simulation timing is as follows:

[0119] Within 0 to 0.1 seconds, the electric vehicle charging is complete, and the system stops working;

[0120] 0.1~0.3s, the electric vehicle is connected to the charger, operating condition A;

[0121] Within 0.3 to 0.4 seconds, the electric vehicle is fully charged and the system stops working.

[0122] 0.4–0.6s, the electric vehicle is connected to the charger, operating condition B;

[0123] The electric vehicle completes charging in 0.6–0.7 seconds, and the system stops working.

[0124] 0.7–0.9 seconds, the electric vehicle is connected to the charger, operating condition C;

[0125] Within 0.9 to 1 second, the electric vehicle is fully charged and the system stops working.

[0126] 1-1.2s, the electric vehicle is connected to the charger, operating condition D;

[0127] Within 1.2 to 1.3 seconds, the electric vehicle is fully charged and the system stops working.

[0128] 1.3~1.5s, the electric vehicle is connected to the charger, operating condition E;

[0129] In 1.5 to 1.6 seconds, the electric vehicle is fully charged and the system stops working.

[0130] 1.6–1.8 seconds, the electric vehicle is connected to the charger, operating condition F;

[0131] In 1.8 to 1.9 seconds, the electric vehicle is fully charged and the system stops working.

[0132] In the simulation, the output voltage V of each module m_out Waveform as Figure 6 As shown, current I m_out Waveform as Figure 7 As shown, the charging gun is connected to the electric vehicle's charging voltage V. charger1 V charger2 and current I charger1 I charger2 The waveforms are as follows: Figure 8 and Figure 9 As shown.

[0133] The charging method of the aforementioned charging pile in this application includes an electrically connected switch array and a DC-DC power module. The DC-DC power module comprises multiple power sub-modules. The method includes: acquiring the charging voltage and charging current of the electric vehicle; determining the number of power sub-modules connected in series based on the charging voltage of the electric vehicle, and determining the number of power sub-modules connected in parallel based on the charging current of the electric vehicle; determining the opening and closing of each switching device based on the number of power sub-modules connected in series and in parallel, thereby determining the connection mode of each power sub-module in the DC-DC power module for charging the electric vehicle. This method connects flexible switch arrays to the input and output terminals of the DC-DC power module respectively, realizing dynamic reconfigurability of series and parallel connections between modules. For the charging voltage and current requirements of different electric vehicles, the number of modules to be connected and the connection mode of the input / output terminals between modules are calculated, and then the switch array is controlled to realize circuit reconfiguration, effectively improving the flexibility of the system. The number of modules connected in parallel changes the current, and the number of modules connected in series changes the voltage. Introducing series reconfiguration can avoid large-range voltage regulation of modules and simplify the design of the power module. Meanwhile, matching the input and output connection methods between modules aims to control the voltage gain of the modules within the optimal range, thereby allowing the modules to operate near their peak efficiency point. This solves the problems of existing technologies that only use parallel switching of power modules to meet the charging needs of different electric vehicles, resulting in poor flexibility, high requirements for wide voltage regulation capability of single modules, and low efficiency when the modules are operating under light load.

[0134] To enable those skilled in the art to better understand the technical solution of this application, the implementation process of the charging method of the charging pile of this application will be described in detail below with reference to specific embodiments.

[0135] It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0136] This application also provides a charging device for a charging pile. It should be noted that the charging device for the charging pile in this application can be used to execute the charging method for the charging pile provided in this application. This device is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that implements a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0137] The following describes the charging device for the charging pile provided in the embodiments of this application.

[0138] Figure 10 This is a schematic diagram of a charging device for a charging pile according to an embodiment of this application. Figure 10 As shown, the device includes an acquisition unit 10, a first determination unit 20, and a second determination unit 30. The acquisition unit 10 is used to acquire the charging voltage and charging current of the electric vehicle. The first determination unit 20 is used to determine the number of power sub-modules connected in series based on the charging voltage of the electric vehicle, and to determine the number of power sub-modules connected in parallel based on the charging current of the electric vehicle. The second determination unit 30 is used to determine the opening and closing of each of the switching devices based on the number of power sub-modules connected in series and the number of power sub-modules connected in parallel, so as to determine the connection mode of each power sub-module in the DC-DC power module for charging the electric vehicle.

[0139] The charging device of the aforementioned charging pile of this application includes an electrically connected switch array and a DC-DC power module. The DC-DC power module includes multiple power sub-modules, including an acquisition unit, a first determination unit, and a second determination unit. The acquisition unit is used to acquire the charging voltage and charging current of the electric vehicle. The first determination unit is used to determine the number of power sub-modules connected in series according to the charging voltage of the electric vehicle, and to determine the number of power sub-modules connected in parallel according to the charging current of the electric vehicle. The second determination unit is used to determine the opening and closing of each switching device according to the number of power sub-modules connected in series and in parallel, so as to determine the connection mode of each power sub-module in the DC-DC power module for charging the electric vehicle. This method connects a flexible switch array to the input and output terminals of the DC-DC power module respectively, realizing dynamic reconfigurability of the series and parallel connection mode between modules. For the charging voltage and current requirements of different electric vehicles, the number of modules to be connected and the connection mode of the input / output terminals between modules are calculated, and then the switch array is controlled to realize circuit reconfiguration, effectively improving the flexibility of the system. The number of modules connected in parallel changes the current, and the number of modules connected in series changes the voltage. Introducing series reconfiguration can avoid large-range voltage regulation of modules and simplify the design of power modules. Meanwhile, matching the input and output connection methods between modules aims to control the voltage gain of the modules within the optimal range, thereby allowing the modules to operate near their peak efficiency point. This solves the problems of existing technologies that only use parallel switching of power modules to meet the charging needs of different electric vehicles, resulting in poor flexibility, high requirements for wide voltage regulation capability of single modules, and low efficiency when the modules are operating under light load.

[0140] In some optional solutions, the aforementioned switch array includes an input switch array and an output switch array. The input and output switch arrays each include multiple parallel switching devices and multiple series switching devices, respectively. The first determining unit includes a first acquiring module and a first determining module. The first acquiring module acquires a first mapping relationship and a second mapping relationship. The first mapping relationship is a mapping between the charging voltage of the electric vehicle and the number of power sub-modules connected in series at the output of the DC-DC power module. The second mapping relationship is a mapping between the charging current of the electric vehicle and the number of power sub-modules connected in parallel at the output of the DC-DC power module. The first mapping relationship is a positive correlation. The first determining module determines the number of power sub-modules connected in series at the output of the DC-DC power module based on the charging voltage of the electric vehicle and the first mapping relationship, and determines the number of power sub-modules connected in parallel at the output of the DC-DC power module based on the charging current of the electric vehicle and the second mapping relationship. Flexible switch arrays are connected to the input and output of the power module respectively, enabling dynamic reconfiguration of the series-parallel connection between modules.

[0141] In some optional solutions, the first determining unit further includes a second determining module and a third determining module. The second determining module is used to determine the output voltage of one of the power sub-modules based on the charging voltage of the electric vehicle and the number of power sub-modules connected in parallel with the output terminal of the DC-DC power module. The third determining module is used to determine the number of power sub-modules connected in series with the input terminal of the DC-DC power module based on the DC voltage value provided by the DC bus of the charging pile and the output voltage of one of the power sub-modules, so that the difference between the input voltage and the output voltage of the power sub-module is within a preset difference range. Matching the input and output connection methods between the power sub-modules aims to control the voltage gain of the power sub-modules within the optimal range, thereby allowing the power sub-modules to operate near their peak efficiency point.

[0142] In some optional solutions, the aforementioned power submodule is a dual active full-bridge circuit. The device further includes a fourth determining module, a fifth determining module, a sixth determining module, a seventh determining module, and an execution module. The fourth determining module, after determining the connection method of each power submodule in the aforementioned DC-DC power module, determines a voltage regulation shift ratio based on the module voltage regulator ring, which controls the output voltage of the aforementioned DC-DC power module within a preset voltage range. The fifth determining module determines a current sharing shift ratio based on the module current sharing ring, which controls the current of each power submodule connected in parallel to be the same. The sixth determining module determines a voltage sharing shift ratio based on the module voltage equalizing ring, which controls the voltage of each power submodule connected in series to be the same. The seventh determining module determines the sum of the aforementioned voltage regulation shift ratio, the aforementioned current sharing shift ratio, and the aforementioned voltage equalizing shift ratio as the total shift ratio of the aforementioned power submodule. The execution module uses the limited total shift ratio to perform single-phase shift modulation on the transistors in the aforementioned power submodule to control the operation of the aforementioned power submodule. This ensures stable output voltage, thereby achieving stable power supply for electric vehicles. Furthermore, since the charging piles charge electric vehicles simultaneously through several modules, it is necessary to control the power transmission balance between the modules.

[0143] In this embodiment, the fourth determining module includes a first determining submodule and a first processing submodule. The first determining submodule is used to determine the difference between the actual system output voltage and the system output voltage reference value as a first difference value, wherein the actual system output voltage is the voltage actually output by the charging pile. The first processing submodule is used to adjust the first difference value using a PI regulator to obtain a first adjustment value, and then to limit the first adjustment value to obtain the voltage regulation shift ratio. This ensures a stable output voltage and thus achieves stable power supply to the electric vehicle.

[0144] In one optional scheme, the fifth determining module includes a first acquisition submodule, a second determining submodule, a third determining submodule, and a second processing submodule. The first acquisition submodule is used to acquire the number of parallel branches x at the input terminal of the DC-DC power module and the actual system input current, wherein the actual system input current is the current actually input to the input terminal of the DC-DC power module. The second determining submodule is used to determine the actual system input current after a 1 / x gain as a reference value for the module input current. The third determining submodule is used to determine the difference between the reference value for the module input current and the actual module input current as a second difference value. The second processing submodule is used to adjust the second difference value using a PI regulator to obtain a second adjusted value, and then to limit the second adjusted value to obtain the current-sharing ratio. This allows for obtaining the current-sharing ratio, which can control the port currents of the parallel modules to be equal, thereby achieving power balance.

[0145] As an optional solution, the sixth determining module includes a second acquisition submodule, a fourth determining submodule, a fifth determining submodule, and a third processing submodule. The second acquisition submodule is used to acquire the number y of the power submodules connected in series on a parallel branch of the input terminal of the DC-DC power module and the actual system input voltage, where the actual system input voltage is the voltage actually input to the input terminal of the DC-DC power module. The fourth determining submodule is used to determine the actual system input voltage after 1 / y gain as the module input voltage reference value. The fifth determining submodule is used to determine the difference between the module input voltage reference value and the actual module input voltage as the third difference value. The third processing submodule is used to adjust the third difference value using a PI regulator to obtain a third adjusted value, and then limits the third adjusted value to obtain the voltage equalization shift ratio. This voltage equalization shift ratio can be obtained, which can control the port voltages of the series modules to be equal, thereby achieving power balance.

[0146] The charging device of the aforementioned charging pile includes a processor and a memory. The aforementioned acquisition units, etc., are all stored as program units in the memory, and the processor executes these program units stored in the memory to achieve the corresponding functions. All of the aforementioned modules are located in the same processor; alternatively, the aforementioned modules may be located in different processors in any combination.

[0147] The processor contains a kernel, which retrieves the corresponding program unit from memory. One or more kernels can be configured. By adjusting kernel parameters, the limitations of existing technologies, which rely solely on parallel switching of power modules to meet the charging needs of different electric vehicles, such as poor flexibility, high requirements for wide voltage regulation of single modules, and low efficiency under light load, can be addressed.

[0148] The memory may include non-permanent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0149] This invention provides a computer-readable storage medium including a stored program, wherein, when the program is executed, it controls the device containing the computer-readable storage medium to perform the charging method of the charging pile.

[0150] Specifically, the charging methods for the charging stack include:

[0151] Step S201: Obtain the charging voltage and charging current of the electric vehicle;

[0152] Specifically, in electric vehicle charging stations with a common DC bus, a reconfigurable DC-DC converter is used to supply power to multiple charging guns. After detecting that an electric vehicle has connected to a charging gun and obtaining the electric vehicle's charging information (charging voltage and charging current) through communication, the number of connected modules is determined. With the optimization goal of making the modules operate near their optimal efficiency point, the switch array adjusts the series and parallel connections between the modules to meet the voltage and current requirements of vehicle charging. Finally, the charging guns are connected to achieve a reasonable allocation of charging pile modules.

[0153] Step S202: Determine the number of power sub-modules connected in series according to the charging voltage of the electric vehicle, and determine the number of power sub-modules connected in parallel according to the charging current of the electric vehicle.

[0154] Specifically, the number of power submodules connected in parallel changes the current, and the output of power submodules connected in series changes the voltage. Introducing series reconfiguration can avoid large-range voltage regulation of the module and simplify the design of the power module.

[0155] Step S203: Based on the number of power sub-modules connected in series and the number of power sub-modules connected in parallel, determine the opening and closing of each of the switching devices to determine the connection method of each of the power sub-modules in the DC-DC power module, so as to charge the electric vehicle.

[0156] Specifically, based on the charging voltage and current requirements of different electric vehicles, the number of modules to be put into operation and the connection method of the input / output terminals between modules are calculated. Then, the switch array is controlled to realize circuit reconfiguration, which effectively improves the flexibility of the system.

[0157] This invention provides a processor for running a program, wherein the program executes the charging method of the charging pile.

[0158] Specifically, the charging methods for the charging stack include:

[0159] Step S201: Obtain the charging voltage and charging current of the electric vehicle;

[0160] Specifically, in electric vehicle charging stations with a common DC bus, a reconfigurable DC-DC converter is used to supply power to multiple charging guns. After detecting that an electric vehicle has connected to a charging gun and obtaining the electric vehicle's charging information (charging voltage and charging current) through communication, the number of connected modules is determined. With the optimization goal of making the modules operate near their optimal efficiency point, the switch array adjusts the series and parallel connections between the modules to meet the voltage and current requirements of vehicle charging. Finally, the charging guns are connected to achieve a reasonable allocation of charging pile modules.

[0161] Step S202: Determine the number of power sub-modules connected in series according to the charging voltage of the electric vehicle, and determine the number of power sub-modules connected in parallel according to the charging current of the electric vehicle.

[0162] Specifically, the number of power submodules connected in parallel changes the current, and the output of power submodules connected in series changes the voltage. Introducing series reconfiguration can avoid large-range voltage regulation of the module and simplify the design of the power module.

[0163] Step S203: Based on the number of power sub-modules connected in series and the number of power sub-modules connected in parallel, determine the opening and closing of each of the switching devices to determine the connection method of each of the power sub-modules in the DC-DC power module, so as to charge the electric vehicle.

[0164] Specifically, based on the charging voltage and current requirements of different electric vehicles, the number of modules to be put into operation and the connection method of the input / output terminals between modules are calculated. Then, the switch array is controlled to realize circuit reconfiguration, which effectively improves the flexibility of the system.

[0165] This invention provides a device including a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, it performs at least the following steps:

[0166] Step S201: Obtain the charging voltage and charging current of the electric vehicle;

[0167] Step S202: Determine the number of power sub-modules connected in series according to the charging voltage of the electric vehicle, and determine the number of power sub-modules connected in parallel according to the charging current of the electric vehicle.

[0168] Step S203: Based on the number of power sub-modules connected in series and the number of power sub-modules connected in parallel, determine the opening and closing of each of the switching devices to determine the connection method of each of the power sub-modules in the DC-DC power module, so as to charge the electric vehicle.

[0169] The devices mentioned in this article can be servers, PCs, tablets, mobile phones, etc.

[0170] This application also provides a computer program product, which, when executed on a data processing device, is suitable for executing an initialization program having at least the following method steps:

[0171] Step S201: Obtain the charging voltage and charging current of the electric vehicle;

[0172] Step S202: Determine the number of power sub-modules connected in series according to the charging voltage of the electric vehicle, and determine the number of power sub-modules connected in parallel according to the charging current of the electric vehicle.

[0173] Step S203: Based on the number of power sub-modules connected in series and the number of power sub-modules connected in parallel, determine the opening and closing of each of the switching devices to determine the connection method of each of the power sub-modules in the DC-DC power module, so as to charge the electric vehicle.

[0174] It is obvious to those skilled in the art that the modules or steps of the present invention described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. They can be implemented using computer-executable program code, and thus can be stored in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those described herein, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, the present invention is not limited to any particular combination of hardware and software.

[0175] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0176] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0177] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0178] These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable apparatus for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0179] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0180] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0181] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0182] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0183] As can be seen from the above description, the embodiments of this application achieve the following technical effects:

[0184] 1) The charging method of the charging pile described in this application includes an electrically connected switch array and a DC-DC power module. The DC-DC power module includes multiple power sub-modules. The method includes: acquiring the charging voltage and charging current of the electric vehicle; determining the number of power sub-modules connected in series according to the charging voltage of the electric vehicle, and determining the number of power sub-modules connected in parallel according to the charging current of the electric vehicle; determining the opening and closing of each switching device according to the number of power sub-modules connected in series and in parallel, so as to determine the connection mode of each power sub-module in the DC-DC power module for charging the electric vehicle. This method connects a flexible switch array to the input and output terminals of the DC-DC power module respectively, realizing dynamic reconfigurability of the series and parallel connection mode between modules. For the charging voltage and current requirements of different electric vehicles, the number of modules to be connected and the connection mode of the input / output terminals between modules are calculated, and then the switch array is controlled to realize circuit reconfiguration, effectively improving the flexibility of the system. The number of modules connected in parallel changes the current, and the number of modules connected in series changes the voltage. Introducing series reconfiguration can avoid large-range voltage regulation of modules and simplify the design of the power module. Meanwhile, matching the input and output connection methods between modules aims to control the voltage gain of the modules within the optimal range, thereby allowing the modules to operate near their peak efficiency point. This solves the problems of existing technologies that only use parallel switching of power modules to meet the charging needs of different electric vehicles, resulting in poor flexibility, high requirements for wide voltage regulation capability of single modules, and low efficiency when the modules are operating under light load.

[0185] 2) The charging device of the charging pile described in this application includes an electrically connected switch array and a DC-DC power module. The DC-DC power module includes multiple power sub-modules, including an acquisition unit, a first determining unit, and a second determining unit. The acquisition unit is used to acquire the charging voltage and charging current of the electric vehicle. The first determining unit is used to determine the number of power sub-modules connected in series according to the charging voltage of the electric vehicle, and to determine the number of power sub-modules connected in parallel according to the charging current of the electric vehicle. The second determining unit is used to determine the opening and closing of each switching device according to the number of power sub-modules connected in series and in parallel, so as to determine the connection mode of each power sub-module in the DC-DC power module for charging the electric vehicle. This method connects a flexible switch array to the input and output terminals of the DC-DC power module respectively, realizing dynamic reconfigurability of the series and parallel connection mode between modules. For the charging voltage and current requirements of different electric vehicles, the number of modules to be connected and the connection mode of the input / output terminals between modules are calculated, and then the switch array is controlled to realize circuit reconfiguration, effectively improving the flexibility of the system. The number of modules connected in parallel changes the current, and the number of modules connected in series changes the voltage. Introducing series reconfiguration can avoid large-range voltage regulation of modules and simplify the design of power modules. Meanwhile, matching the input and output connection methods between modules aims to control the voltage gain of the modules within the optimal range, thereby allowing the modules to operate near their peak efficiency point. This solves the problems of existing technologies that only use parallel switching of power modules to meet the charging needs of different electric vehicles, resulting in poor flexibility, high requirements for wide voltage regulation capability of single modules, and low efficiency when the modules are operating under light load.

[0186] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A charging method for a charging stack, characterized in that, The charging stack includes an electrically connected switch array and a DC-DC power module. The switch array includes multiple switching devices, and the DC-DC power module includes multiple power sub-modules. Each switching device is used to control the connection mode of each power sub-module. The method includes: Obtain the charging voltage and charging current of the electric vehicle; The number of power sub-modules connected in series is determined based on the charging voltage of the electric vehicle, and the number of power sub-modules connected in parallel is determined based on the charging current of the electric vehicle. Based on the number of power submodules connected in series and the number of power submodules connected in parallel, the opening and closing of each switching device is determined to determine the connection method of each power submodule in the DC-DC power module, so as to charge the electric vehicle; The switch array includes an input switch array and an output switch array. The input switch array and the output switch array each include multiple parallel switching devices and multiple series switching devices. The number of power sub-modules connected in series is determined based on the charging voltage of the electric vehicle, and the number of power sub-modules connected in parallel is determined based on the charging current of the electric vehicle. This includes: obtaining a first mapping relationship and a second mapping relationship. The first mapping relationship is a mapping between the charging voltage of the electric vehicle and the number of power sub-modules connected in series at the output terminal of the DC-DC power module. The second mapping relationship is a mapping between the charging current of the electric vehicle and the number of power sub-modules connected in parallel at the output terminal of the DC-DC power module. The first mapping relationship is a positive correlation. Based on the charging voltage of the electric vehicle and the first mapping relationship, the number of power sub-modules connected in series at the output terminal of the DC-DC power module is determined. Based on the charging current of the electric vehicle and the second mapping relationship, the number of power sub-modules connected in parallel at the output terminal of the DC-DC power module is determined. Determining the number of power submodules connected in series based on the charging voltage of the electric vehicle includes: determining the output voltage of one power submodule based on the number of power submodules connected in parallel with the output terminal of the DC-DC power module based on the charging voltage of the electric vehicle and the output terminal of the DC-DC power module; and determining the number of power submodules connected in series with the input terminal of the DC-DC power module based on the DC voltage value provided by the DC bus of the charging pile and the output terminal voltage of one power submodule, so that the difference between the input terminal voltage and the output terminal voltage of the power submodule is within a preset difference range.

2. The charging method according to claim 1, characterized in that, The power submodule is a dual active full-bridge circuit. After determining the connection method of each power submodule in the DC-DC power module, the method further includes: Based on the voltage regulation shift determined by the module voltage regulator loop, the module voltage regulator loop is used to control the output voltage of the DC-DC power module within a preset voltage range; Compared to determining the current sharing shift based on the module current sharing loop, the module current sharing loop is used to control the current of each of the parallel power sub-modules to be the same. Compared with the voltage equalization shift determined by the module voltage equalization ring, the module voltage equalization ring is used to control the voltage of each of the power sub-modules connected in series to be the same; The sum of the voltage regulation shift ratio, the current equalization shift ratio, and the voltage equalization shift ratio is determined as the total shift ratio of the power submodule; The power submodule is controlled by using a single-phase-shift modulation of the transistors after the total phase shift is limited.

3. The charging method according to claim 2, characterized in that, The voltage regulation shift determined based on the module voltage regulator loop includes: The difference between the actual system output voltage and the system output voltage reference value is determined as the first difference value, wherein the actual system output voltage is the voltage actually output by the charging pile; A PI controller is used to adjust the first difference to obtain a first adjustment value, and the first adjustment value is then limited to obtain the voltage stabilization shift ratio.

4. The charging method according to claim 2, characterized in that, Compared to determining the flow displacement based on the module flow sharing loop, this includes: Obtain the number of parallel branches x at the input terminal of the DC-DC power module and the actual system input current, wherein the actual system input current is the current actually input to the input terminal of the DC-DC power module; The actual input current of the system after 1 / x gain is determined as the reference value of the module input current; The difference between the module input current reference value and the module actual input current is determined as the second difference value; The second difference is adjusted using a PI controller to obtain a second adjusted value, and the second adjusted value is then limited to obtain the average flow ratio.

5. The charging method according to claim 2, characterized in that, The comparison of voltage equalization shift determined based on the module voltage equalization ring includes: Obtain the number y of the power sub-modules connected in series on a parallel branch of the input terminal of the DC-DC power module and the actual system input voltage, wherein the actual system input voltage is the voltage actually input to the input terminal of the DC-DC power module; The actual input voltage of the system after 1 / y gain is determined as the reference value for the module input voltage. The difference between the module input voltage reference value and the actual input voltage of the module is determined as the third difference value; The third difference is adjusted using a PI controller to obtain a third adjustment value, and the third adjustment value is then limited to obtain the equal pressure shift ratio.

6. A charging apparatus for a charging pile, used to perform the charging method for the charging pile according to any one of claims 1 to 5, characterized in that, The charging stack includes an electrically connected switch array and a DC-DC power module. The switch array includes multiple switching devices, and the DC-DC power module includes multiple power sub-modules. Each switching device is used to control the connection mode of each power sub-module. The device includes: The acquisition unit is used to acquire the charging voltage and charging current of the electric vehicle; The first determining unit is used to determine the number of power submodules connected in series based on the charging voltage of the electric vehicle, and to determine the number of power submodules connected in parallel based on the charging current of the electric vehicle. The second determining unit is used to determine the opening and closing of each of the switching devices based on the number of series connections and the number of parallel connections of the power sub-modules, so as to determine the connection mode of each of the power sub-modules in the DC-DC power module for charging the electric vehicle.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein, when the program is executed, it controls the device containing the computer-readable storage medium to perform the charging method of the charging pile according to any one of claims 1 to 5.

8. An electronic device, characterized in that, include: One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including a charging method for performing a charging stack according to any one of claims 1 to 5.

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