Charging control method, system and device based on power mutual aid and storage medium

Abstract

The invention relates to the technical field of power supply, and particularly provides a charging control method, system and device based on power mutual aid and a storage medium, and the method comprises the steps: controlling a bidirectional AC / DC converter at a power grid side to start in a voltage source mode, so as to stabilize the voltage of a DC bus at a load side within a standard voltage range; monitoring the actual voltage, the load demand power and the actual input power of the power grid side of the direct current bus in real time; if it is confirmed that the actual voltage is reduced to a lower limit value of a standard voltage range, the required output power of the direct current energy storage device is calculated based on the load required power and the actual input power of the power grid side, and the required output power and a current source mode enable signal are sent to an energy storage module; and determining that the actual voltage exceeds an upper limit value of a standard voltage range, calculating excess power needing to be reduced by the energy storage module, and sending the excess power and a signal for switching to a constant voltage mode to the energy storage module. According to the invention, all charging processes are ensured to be stable and uninterrupted.

Description

Technical Field

[0001] The present invention belongs to the technical field of power supply, and in particular relates to a charging control method, system, device and storage medium based on power mutual assistance. Background Art

[0002] With the rapid development of new energy vehicles, demand for charging stations, especially high-power DC fast-charging stations, has surged. When multiple charging stations operate simultaneously within a charging station, load power fluctuates dramatically and frequently, posing a significant challenge to grid input power and local DC bus voltage stability.

[0003] In existing technologies, simply relying on grid-side converter expansion to meet peak power demands is costly and inefficient; relying solely on large-scale energy storage systems for power support presents economical problems with huge investments and low utilization rates. In particular, when multiple vehicles are simultaneously undergoing high-power fast charging or when there is a sudden change in load power, it is very easy for the DC bus voltage to exceed the standard range: voltage that is too low may cause charging interruptions or equipment failures, while voltage that is too high threatens equipment safety. How to economically and efficiently maintain DC bus voltage stability without significantly increasing grid capacity and energy storage configuration, and achieve dynamic power matching and mutual assistance between the grid, energy storage, and dynamic loads, has become a key technical challenge that needs to be solved urgently.

[0004] Therefore, a more intelligent and coordinated charging control method is urgently needed to address the above challenges. Summary of the Invention

[0005] In view of the above-mentioned deficiencies in the prior art, the present invention provides a charging control method, system, device and storage medium based on power mutual assistance to solve the above-mentioned technical problems.

[0006] In a first aspect, the present invention provides a charging control method based on power mutual assistance, comprising: Control the bidirectional AC / DC converter on the grid side to start in voltage source mode to stabilize the voltage of the DC bus on the load side within the standard voltage range; Real-time monitoring of the actual voltage of the DC bus, load demand power, and actual grid-side input power; Confirming that the actual voltage drops to the lower limit of the standard voltage range, calculating the required output power of the DC energy storage device based on the load demand power and the actual input power on the grid side, and sending the required output power and a current source mode enable signal to the energy storage module; If it is confirmed that the actual voltage exceeds the upper limit of the standard voltage range, the excess power that needs to be reduced by the energy storage module is calculated, and a signal indicating the excess power and switching to a constant voltage mode is sent to the energy storage module; Wherein, the output end of the DC bus is connected to multiple charging piles.

[0007] In an optional embodiment, controlling the grid-side bidirectional AC / DC converter to start in a voltage source mode includes: In the initialization phase, a voltage source mode enable signal is sent to the grid-side bidirectional AC / DC converter to enable the bidirectional AC / DC converter to start the voltage source mode; in the voltage source mode, the bidirectional AC / DC converter stabilizes the voltage of the DC bus within a standard voltage range; The bidirectional AC / DC converter is used to convert AC on the grid side into DC with a standard voltage.

[0008] In an optional embodiment, the method further includes: A standard voltage value and a threshold value are set, a difference between the standard voltage value and the threshold value is set as a lower limit value of a standard voltage range, and a sum of the standard voltage value and the threshold value is set as an upper limit value of the standard voltage range.

[0009] In an optional embodiment, real-time monitoring of the actual voltage of the DC bus, the load demand power, and the actual grid-side input power includes: The actual voltage of the DC bus is collected through a voltage transformer; Obtain the required power from the charging pile through the CAN bus, and sum the obtained required power to obtain the load required power; The actual input power of the grid is obtained from the bidirectional AC / DC converter.

[0010] In an optional embodiment, calculating the required output power of the DC energy storage device based on the load required power and the actual grid-side input power includes: The power difference between the load demand power and the actual input power on the grid side is calculated, and the power difference is used as the required output power of the DC energy storage device.

[0011] In an optional embodiment, the method further includes: The main controller of the energy storage module receives the required output power and the current source mode enable signal and enters the current source mode. In the current source mode, the main controller calculates the required current according to the standard voltage of the DC bus and the required output power, and sends the required current to the slave controllers of each battery; The slave controller of the energy storage module generates an output current of the battery based on a ratio of the available capacity of the battery to the total capacity of the energy storage module and the received demand current; The master controller periodically updates the total capacity of the storage modules to each slave controller.

[0012] In an optional embodiment, the method further includes: A dynamic load balancing algorithm is used to allocate charging power to each charging pile according to the priority of each charging pile.

[0013] In a second aspect, the present invention provides a charging control system based on power mutual assistance, comprising: An initial control module, configured to control the bidirectional AC / DC converter on the grid side to start in a voltage source mode, so as to stabilize the voltage of the DC bus on the load side within a standard voltage range; A real-time monitoring module is used to monitor the actual voltage of the DC bus, the load demand power and the actual input power on the grid side in real time; A first control module is configured to determine that the actual voltage drops to the lower limit of the standard voltage range, calculate the required output power of the DC energy storage device based on the load required power and the actual input power on the grid side, and send the required output power and a current source mode enable signal to the energy storage module; A second control module is configured to determine that the actual voltage exceeds an upper limit of a standard voltage range, calculate excess power that needs to be reduced by the energy storage module, and send a signal indicating the excess power and switching to a constant voltage mode to the energy storage module; Wherein, the output end of the DC bus is connected to multiple charging piles.

[0014] According to a third aspect, a device is provided, comprising: A memory for storing a charging control program based on power mutual assistance; The processor is configured to implement the steps of the charging control method based on power mutual assistance provided in the first aspect when executing the charging control program based on power mutual assistance.

[0015] In a fourth aspect, a computer-readable storage medium is provided, on which a charging control program based on power mutual assistance is stored. When the charging control program based on power mutual assistance is executed by a processor, the steps of the charging control method based on power mutual assistance provided in the first aspect are implemented.

[0016] The beneficial effects of the present invention lie in the power-assisted charging control method, system, device, and storage medium provided herein. Through dynamic coordination (current source / constant voltage mode switching) between the grid converter voltage source mode and the energy storage device, this method effectively addresses severe load power fluctuations, strictly controlling the DC bus voltage within a specified range and ensuring safe and reliable operation of the charging equipment. The energy storage device provides power support (output) or absorbs excess power (curtailment) during load peaks or sudden changes, significantly smoothing grid input power and reducing excessive demands on grid-side converter capacity and grid access points. Energy storage is precisely called upon for power compensation (output or absorption) only when voltage exceeds a certain limit, avoiding continuous full-load operation of the energy storage, improving its utilization efficiency and service life, and reducing overall energy storage capacity requirements and investment costs. This effectively addresses the system power imbalance caused by the simultaneous operation of multiple charging stations (especially high-power fast charging stations), ensuring stable and uninterrupted charging throughout the charging process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0018] Figure 1 is a schematic flow chart of a method according to an embodiment of the present invention.

[0019] Figure 2 FIG. 4 is a schematic block diagram of a system according to an embodiment of the present invention.

[0020] Figure 3 A schematic structural diagram of a device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0023] The charging control method based on power mutual assistance provided by the embodiment of the present invention is executed by a computer device. Accordingly, the charging control system based on power mutual assistance runs in the computer device.

[0024] Figure 1 is a schematic flow chart of a method according to an embodiment of the present invention. Figure 1 The execution subject can be a charging control system based on power mutual assistance. According to different needs, the order of the steps in the flowchart can be changed, and some can be omitted.

[0025] like Figure 1 As shown, the method includes: S1. Control the bidirectional AC / DC converter on the grid side to start in voltage source mode to stabilize the voltage of the DC bus on the load side within a standard voltage range; wherein the output end of the DC bus is connected to multiple charging piles; S2 real-time monitoring of the actual voltage of the DC bus, load demand power and actual grid-side input power; S3 confirms that the actual voltage drops to the lower limit of the standard voltage range, then calculates the required output power of the DC energy storage device based on the load demand power and the actual grid-side input power, and sends the required output power and current source mode enable signal to the energy storage module; S4. If it is confirmed that the actual voltage exceeds the upper limit of the standard voltage range, the excess power that needs to be reduced by the energy storage module is calculated, and a signal indicating the excess power and switching to the constant voltage mode is sent to the energy storage module.

[0026] In an embodiment of the present invention, based on step S1, a possible embodiment will be given below to illustrate its specific implementation scheme in a non-limiting manner.

[0027] During the initialization phase, an enable signal for the voltage source mode is sent to the bidirectional AC / DC converter on the grid side so that the bidirectional AC / DC converter starts the voltage source mode; in the voltage source mode, the bidirectional AC / DC converter stabilizes the voltage of the DC bus within a standard voltage range; wherein, the bidirectional AC / DC converter is used to convert the AC on the grid side into DC of standard voltage.

[0028] Set a standard voltage value and a threshold value, set the difference between the standard voltage value and the threshold value as the lower limit of the standard voltage range, and set the sum of the standard voltage value and the threshold value as the upper limit of the standard voltage range. For example, the target voltage range is 750V±750V×1%.

[0029] During the initialization phase of the power electronics system, a voltage source mode enable signal is sent to the grid-side bidirectional AC / DC converter via the communication interface of a microcontroller (MCU) or digital signal processor (DSP). This enable signal is a digital signal compliant with industrial communication protocols such as Modbus TCP, CAN open, or Profibus, ensuring accurate and stable signal transmission. Upon receiving a valid enable signal, the bidirectional AC / DC converter's internal control unit activates voltage source mode, triggering the corresponding control algorithm and hardware driver circuits to put the converter into closed-loop voltage control. In this mode, the bidirectional AC / DC converter uses phase-locked loop (PLL) technology to track the phase and frequency of the grid-side AC voltage in real time. It also uses pulse-width modulation (PWM) to adjust the switching state of power devices (such as IGBTs) to achieve precise control of the DC bus voltage, stabilizing it within the standard voltage range. Setting the standard voltage range involves precise parameter configuration. The system first sets the standard voltage value through the human-machine interface (HMI) or host computer software. This value is determined based on system design requirements and the application scenario. For example, in scenarios like electric vehicle charging stations and energy storage power stations, the standard voltage is typically set at 750V. The threshold value is determined by combining theoretical calculations with experimental debugging, typically ranging from 1% to 5% of the standard voltage value. The difference between the standard voltage value and the threshold value is used as the lower limit of the standard voltage range, while the sum of the standard voltage value and the threshold value is used as the upper limit of the standard voltage range, thereby constructing a complete voltage control range. For example, for a target voltage range of 750V ± 750V × 1%, the lower limit is 742.5V and the upper limit is 757.5V. The converter's voltage closed-loop control system uses a proportional-integral-differential (PID) controller. By collecting the DC bus voltage feedback signal in real time, comparing it with the standard voltage range, and dynamically adjusting the control parameters, it ensures that the DC bus voltage always remains within the target range, providing a stable DC power supply for subsequent loads or energy storage devices.

[0030] In an embodiment of the present invention, based on step S2, a possible embodiment will be given below to illustrate its specific implementation scheme in a non-limiting manner.

[0031] S201. Collect the actual voltage of the DC bus through a voltage transformer.

[0032] A high-precision voltage transformer (VT) is used to accurately measure the actual DC bus voltage. This closed-loop VT, based on the Hall effect principle, boasts a linearity error within ±0.1% and a bandwidth of 50kHz, meeting the requirements for stable DC voltage measurement. The analog signal output by the VT is filtered through a low-pass filter (LPF) to remove high-frequency noise before being sampled by a 16-bit high-precision analog-to-digital converter (ADC). The sampling frequency is set to 1kHz to ensure the real-time and accuracy of the voltage signal. To ensure the reliability of the measurement data, the system periodically calibrates the VT using a three-point calibration method to compensate for errors caused by temperature drift and component aging.

[0033] S202. Obtain the required power from the charging pile via the CAN bus, and sum the obtained required power to obtain the load required power.

[0034] Efficient collection of charging pile power demand data is achieved through the Controller Area Network (CAN) bus. The system adheres to the CAN 2.0B protocol standard, with a communication baud rate configured at 500kbps to ensure low latency and interference resistance in data transmission. Each charging pile serves as a CAN bus node, and its controller encapsulates local power demand data into a message format compliant with the SAE J1939 protocol, containing information such as device ID, power value, and timestamp. The main controller, serving as the master node on the CAN bus, uses a polling method to read message data from each charging pile node in turn, verifying data integrity through a CRC checksum mechanism and eliminating abnormal messages. After receiving the data, the main controller quickly classifies and sums the power demands of each charging pile using a hash table algorithm, ultimately determining the overall load power demand of the system.

[0035] S203. Obtain actual grid input power from the bidirectional AC / DC converter.

[0036] The actual input power of the grid is obtained from the bidirectional AC / DC converter using a measurement method based on instantaneous power theory. The converter integrates a high-precision power measurement module, which synchronously collects the three-phase voltage and current signals on the grid side, converts the three-phase AC quantity into DC quantity in the α-β coordinate system through coordinate transformation, and then calculates the instantaneous power according to the formula , calculating the input power value in real time. The power measurement module communicates with the system main controller via the Modbus TCP protocol, uploading measurement data in 100ms cycles. The data transmission process uses the sliding window mechanism of the TCP / IP protocol stack to ensure the stability and integrity of data transmission.

[0037] In an embodiment of the present invention, based on step S3, a possible embodiment will be given below to illustrate its specific implementation scheme in a non-limiting manner.

[0038] If it is confirmed that the actual voltage drops to the lower limit of the standard voltage range, the required output power of the DC energy storage device is calculated based on the load required power and the actual input power on the grid side, and the required output power and the current source mode enable signal are sent to the energy storage module.

[0039] Specifically, the power difference between the load demand power and the actual input power on the grid side is calculated, and the power difference is used as the required output power of the DC energy storage device.

[0040] The main controller of the energy storage module receives the required output power and the current source mode enable signal and enters the current source mode. In the current source mode, the main controller calculates the required current according to the standard voltage of the DC bus and the required output power, and sends the required current to the slave controllers of each battery; The slave controller of the energy storage module generates the output current of the battery based on the ratio of the available capacity of the battery to the total capacity of the energy storage module and the received demand current; wherein the master controller regularly updates the total capacity of the storage module to each slave controller.

[0041] In one example, during the dynamic regulation of the power system, when the actual voltage of the DC bus is detected to be below the lower limit of the standard voltage range, the system triggers the coordinated control mechanism of the energy storage system. First, the main controller determines the load power demand P load The actual input power P on the grid side grid , calculate the required output power P of the DC energy storage device through the power balance algorithm ESS ,Right now: P ESS =P load −P grid The calculation process uses the Kalman filter algorithm to pre-process the input power data to eliminate the influence of measurement noise on the power difference calculation. At the same time, the system introduces a power prediction model to predict the power fluctuation trend in the short term based on historical data and load characteristics, and dynamically compensates for the required output power. The compensation coefficient K is adjusted according to the system response speed and stability requirements. The final required output power is expressed as:

[0042] The main controller sends the required output power command and current source mode enable signal to the energy storage module via the CAN open protocol. This signal adopts the PDO (Process Data Object) communication mode, and the transmission cycle is set to 10ms to ensure the real-time control of the control command. After receiving the command, the main controller of the energy storage module activates the internal current source control algorithm based on the standard voltage V ref and the required output power P ESS Calculate the required current Iref :

[0043] The calculation process takes into account the efficiency characteristics of the DC / DC converter , the actual demand current is corrected to:

[0044] Among them, efficiency The data is obtained by table lookup method, and the table data is fitted based on the efficiency test data of the converter at different load rates.

[0045] In the current distribution link, the master controller adopts an adaptive weighted current distribution strategy. First, the ModbusRTU protocol is used to poll each slave controller in a 50ms cycle to obtain the available capacity C of the battery to which it belongs. i , and calculate the total available capacity C of the energy storage module in real time total :

[0046] Where n is the number of battery packs. Each slave controller takes up w of its own available capacity. i Generate output current command I i :

[0047] To avoid overcharging or over-discharging of individual batteries, the system introduces a health status (SOH) correction factor k i , the final output current is expressed as:

[0048] Among them, k i Real-time estimation is achieved through battery internal resistance monitoring and capacity decay modeling. The main controller ensures the accuracy of data transmission through a CRC16 checksum mechanism and uses a sliding window protocol to achieve reliable transmission of commands.

[0049] At the control implementation level, the master controller adopts a dual closed-loop control structure consisting of a voltage outer loop and a current inner loop. The voltage loop uses a PI controller, whose parameters are optimized using a genetic algorithm to achieve optimal dynamic response performance. The current loop employs a hysteresis control strategy to ensure rapid and stable current tracking. The slave controller uses a digital PID algorithm for precise current control, with a sampling period set to 200μs to ensure sufficient system bandwidth to cope with sudden load changes. The entire control process uses a state machine to implement mode switching, including standby, pre-charge, current source mode, and fault handling. State transition conditions are determined by voltage thresholds, communication status, and fault diagnosis results.

[0050] In an embodiment of the present invention, based on step S4, a possible embodiment will be given below to illustrate its specific implementation scheme in a non-limiting manner.

[0051] If it is confirmed that the actual voltage exceeds the upper limit of the standard voltage range, the excess power that needs to be reduced by the energy storage module is calculated, and a signal indicating the excess power and switching to the constant voltage mode is sent to the energy storage module.

[0052] Excess power P excess The calculation is based on the system power balance theory, taking into account the actual input power P on the grid side. grid , load demand power P load And the DC bus capacitor energy storage change ΔE cap Since the DC bus capacitor absorbs or releases energy when the voltage fluctuates, the energy change can be expressed by the formula Calculation (where C is the busbar capacitance, V ref is the standard voltage value). The excess power calculation formula is:

[0053] In the formula, Δt is the sampling time interval, which is set to 100ms to ensure the real-time performance of power calculation. In order to eliminate the influence of measurement noise on the calculation results, a composite filtering algorithm combining median filtering and sliding average filtering is used to calculate P. grid and P load Data is preprocessed.

[0054] The main controller sends excess power commands and constant voltage mode switching signals to the energy storage module via Modbus TCP communication based on the TCP / IP protocol. The communication process uses a request-response mechanism. The main controller, acting as the client, sends command requests every 50ms, and the energy storage module, acting as the server, responds within 10ms of receiving the request. To ensure data transmission reliability, each command includes a 16-bit CRC checksum. If the check fails, the command is automatically retransmitted, with a maximum of three retransmissions. The constant voltage mode switching signal is implemented using a state machine control strategy. Upon receiving the switching signal, the energy storage module's internal control unit immediately executes the mode switching process: first, the DC / DC converter's control mode is switched from current source mode to voltage source mode, employing a dual closed-loop control structure consisting of a voltage outer loop and a current inner loop. The voltage outer loop utilizes an adaptive fuzzy PID controller, dynamically adjusting PID parameters based on the real-time voltage deviation and its rate of change. The current inner loop employs a predictive current control (PCC) algorithm, predicting the current reference value for the next cycle in advance for rapid dynamic response. During the mode switching process, soft-start technology gradually adjusts the output voltage to prevent sudden voltage changes from impacting the system. The soft-start time constant is adaptively adjusted based on the bus capacitor value and load characteristics.

[0055] On the basis of the above embodiment, in order to further improve the stability of the charging system, in one implementation, a dynamic load balancing algorithm is used to allocate charging power to each charging pile according to the priority of each charging pile.

[0056] When implementing the dynamic load balancing algorithm, the system first establishes a comprehensive data acquisition system. High-precision current and voltage sensors monitor the operating status of each charging station in real time, including electrical parameters such as charging power, output voltage, and current. Simultaneously, the charging station's built-in controller collects battery parameters from the charging vehicle, such as remaining charge (SOC), rated battery capacity, and maximum charging current limit. Furthermore, the system uses the network communication module to obtain external data such as real-time grid-side power data, DC bus voltage status, charging station reservation information, and user-set charging cutoff times, providing sufficient basis for load balancing decisions. The priority setting for each charging pile is based on a multi-level comprehensive evaluation model. First, a basic priority is set based on the urgency of the charging vehicle. For example, emergency vehicles and public transportation vehicles have the highest priority, while ordinary private cars have a relatively low priority. Second, the priority is refined based on the vehicle's remaining battery capacity (SOC). Vehicles with an SOC below 10% are given a higher priority among vehicles of the same type. In addition, considering the usage time and health status of the charging pile, the priority of charging piles that have been in continuous operation for a long time or have potential failure risks will be dynamically reduced to avoid damage to the equipment due to overload. The priority evaluation results are quantitatively expressed as a numerical value from 0 to 10, with the higher the value, the higher the priority. The dynamic load balancing algorithm uses a hierarchical control architecture to achieve power allocation. At the central control layer, the main controller uses a heuristic search strategy to perform global power pre-allocation based on collected multi-dimensional data and priority assessment results. This strategy prioritizes the basic charging needs of high-priority charging stations to ensure rapid recharging of critical vehicles. Simultaneously, the feasibility of the pre-allocation scheme is verified based on the grid-side power capacity and DC bus voltage stability constraints. If the pre-allocation scheme may cause grid overload or bus voltage to exceed the safe range, a local optimization mechanism is triggered to appropriately reduce the power of low-priority charging stations. At the edge execution layer, each charging pile controller receives power allocation instructions from the central control layer and implements precise power control through an adaptive adjustment mechanism. The controller utilizes a fuzzy logic control algorithm to dynamically adjust the switching frequency and duty cycle of the charging pile's internal power devices (such as IGBT modules) based on the deviation between actual charging power and allocated power, ensuring that the output power quickly and stably converges to the target value. Furthermore, the system incorporates a dynamic feedback adjustment mechanism, whereby the charging pile monitors actual output power in real time and transmits this feedback data back to the central controller. If unreasonable power allocation or abnormal fluctuations are detected, the central controller restarts the load balancing algorithm and performs another round of power allocation optimization, achieving dynamic, precise, and efficient charging power allocation.

[0057] In some embodiments, the power-assisted charging control system may include multiple functional modules composed of computer program segments. The computer program of each program segment in the power-assisted charging control system may be stored in a memory of a computer device and executed by at least one processor to perform (see Figure 1 Description) Charging control function based on power mutual assistance.

[0058] In this embodiment, the charging control system based on power mutual assistance can be divided into multiple functional modules according to the functions it performs, such as Figure 2 As shown. The module referred to in the present invention refers to a series of computer program segments that can be executed by at least one processor and can perform fixed functions, which are stored in a memory. In this embodiment, the functions of each module will be described in detail in subsequent embodiments.

[0059] An initial control module, configured to control the bidirectional AC / DC converter on the grid side to start in a voltage source mode, so as to stabilize the voltage of the DC bus on the load side within a standard voltage range; A real-time monitoring module is used to monitor the actual voltage of the DC bus, the load demand power and the actual input power on the grid side in real time; A first control module is configured to determine that the actual voltage drops to the lower limit of the standard voltage range, calculate the required output power of the DC energy storage device based on the load required power and the actual input power on the grid side, and send the required output power and a current source mode enable signal to the energy storage module; A second control module is configured to determine that the actual voltage exceeds an upper limit of a standard voltage range, calculate excess power that needs to be reduced by the energy storage module, and send a signal indicating the excess power and switching to a constant voltage mode to the energy storage module; Wherein, the output end of the DC bus is connected to multiple charging piles.

[0060] Figure 3The charging control method based on power mutual assistance provided for the embodiment of the present application can be applied to the device. Those skilled in the art will understand that the device structure involved in the embodiment of the present invention does not constitute a limitation on the device, and the device may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently. In the embodiment of the present invention, the device includes but is not limited to a laptop computer, a desktop computer, a workbench, a personal digital assistant, a server, a blade server, a mainframe computer, and other suitable computers. The device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the embodiments of the present application described and / or required herein.

[0061] The device 300 may include a processor 310, a memory 320, and a communication unit 330. These components communicate via one or more buses. Those skilled in the art will appreciate that the server structure shown in the figure does not limit the present invention. The server structure may be a bus structure or a star structure, and may include more or fewer components than shown, or combine certain components, or arrange the components differently.

[0062] The memory 320 can be used to store execution instructions of the processor 310. The memory 320 can be implemented by any type of volatile or non-volatile memory device, or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk, or optical disk. When the execution instructions in the memory 320 are executed by the processor 310, the device 300 can perform some or all of the steps in the above-described method embodiments.

[0063] The processor 310 is the control center of the storage device, which uses various interfaces and lines to connect various parts of the entire electronic device. It executes various functions of the electronic device and / or processes data by running or executing software programs and / or modules stored in the memory 320, and calling data stored in the memory. The processor can be composed of an integrated circuit (IC), for example, it can be composed of a single packaged IC, or it can be composed of multiple packaged ICs with the same or different functions. For example, the processor 310 can only include a central processing unit (CPU). In an embodiment of the present invention, the CPU can be a single computing core or multiple computing cores.

[0064] The communication unit 330 is configured to establish a communication channel so that the storage device can communicate with other devices, receive user data sent by other devices, or send user data to other devices.

[0065] The present invention also provides a computer storage medium, wherein the computer storage medium may store a program that, when executed, may include some or all of the steps of each embodiment provided by the present invention. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

[0066] Those skilled in the art will clearly understand that the techniques in the embodiments of the present invention can be implemented using software and a necessary general-purpose hardware platform. Based on this understanding, the technical solutions in the embodiments of the present invention, or the portion that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium such as a USB flash drive, a mobile hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, among other media capable of storing program code, and includes instructions for causing a computer device (which can be a personal computer, a server, or a second device, a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention.

[0067] In this specification, the same or similar parts between the various embodiments can be referred to each other. In particular, for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method embodiment.

[0068] In the several embodiments provided by the present invention, it should be understood that the disclosed systems and methods can be implemented in other ways. For example, the system embodiments described above are merely illustrative. For example, the division of the modules is merely a logical function division. In actual implementation, there may be other division methods, such as multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of systems or modules, and can be electrical, mechanical or other forms.

[0069] The modules described as separate components may or may not be physically separate, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed across multiple network modules. Some or all of the modules may be selected to achieve the purpose of the present embodiment according to actual needs.

[0070] In addition, each functional module in each embodiment of the present invention may be integrated into one processing module, or each module may exist physically separately, or two or more modules may be integrated into one module.

[0071] Although the present invention has been described in detail with reference to the accompanying drawings and in conjunction with preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, persons of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and such modifications or substitutions shall be within the scope of the present invention. Any changes or substitutions that can be easily conceived by persons skilled in the art within the technical scope disclosed in the present invention shall be within the scope of protection of the present invention.

Claims

1. A charging control method based on power mutual assistance, characterized in that: include: Control the bidirectional AC / DC converter on the grid side to start in voltage source mode to stabilize the voltage of the DC bus on the load side within the standard voltage range; Real-time monitoring of the actual voltage of the DC bus, load demand power, and actual grid-side input power; Confirming that the actual voltage drops to the lower limit of the standard voltage range, calculating the required output power of the DC energy storage device based on the load demand power and the actual input power on the grid side, and sending the required output power and a current source mode enable signal to the energy storage module; If it is confirmed that the actual voltage exceeds the upper limit of the standard voltage range, the excess power that needs to be reduced by the energy storage module is calculated, and a signal indicating the excess power and switching to a constant voltage mode is sent to the energy storage module; Wherein, the output end of the DC bus is connected to multiple charging piles.

2. The method according to claim 1, characterized in that Control the bidirectional AC / DC converter on the grid side to start in voltage source mode, including: In the initialization phase, a voltage source mode enable signal is sent to the grid-side bidirectional AC / DC converter to enable the bidirectional AC / DC converter to start the voltage source mode; in the voltage source mode, the bidirectional AC / DC converter stabilizes the voltage of the DC bus within a standard voltage range; The bidirectional AC / DC converter is used to convert AC on the grid side into DC with a standard voltage.

3. The method according to claim 1, characterized in that The method further comprises: A standard voltage value and a threshold value are set, a difference between the standard voltage value and the threshold value is set as a lower limit value of a standard voltage range, and a sum of the standard voltage value and the threshold value is set as an upper limit value of the standard voltage range.

4. The method according to claim 1, wherein Real-time monitoring of the actual voltage of the DC bus, load demand power, and actual grid-side input power, including: The actual voltage of the DC bus is collected through a voltage transformer; Obtain the required power from the charging pile through the CAN bus, and sum the obtained required power to obtain the load required power; The actual input power of the grid is obtained from the bidirectional AC / DC converter.

5. The method according to claim 3, characterized in that Calculate the required output power of the DC energy storage device based on the load demand power and the actual grid input power, including: The power difference between the load demand power and the actual input power on the grid side is calculated, and the power difference is used as the required output power of the DC energy storage device.

6. The method according to claim 5, characterized in that The method further comprises: The main controller of the energy storage module receives the required output power and the current source mode enable signal and enters the current source mode. In the current source mode, the main controller calculates the required current according to the standard voltage of the DC bus and the required output power, and sends the required current to the slave controllers of each battery; The slave controller of the energy storage module generates an output current of the battery based on a ratio of the available capacity of the battery to the total capacity of the energy storage module and the received demand current; The master controller periodically updates the total capacity of the storage modules to each slave controller.

7. The method according to claim 1, characterized in that The method further comprises: A dynamic load balancing algorithm is used to allocate charging power to each charging pile according to the priority of each charging pile.

8. A charging control system based on power mutual assistance, characterized in that: include: An initial control module, configured to control the bidirectional AC / DC converter on the grid side to start in a voltage source mode, so as to stabilize the voltage of the DC bus on the load side within a standard voltage range; A real-time monitoring module is used to monitor the actual voltage of the DC bus, the load demand power and the actual input power on the grid side in real time; A first control module is configured to determine that the actual voltage drops to the lower limit of the standard voltage range, calculate the required output power of the DC energy storage device based on the load required power and the actual input power on the grid side, and send the required output power and a current source mode enable signal to the energy storage module; A second control module is configured to determine that the actual voltage exceeds an upper limit of a standard voltage range, calculate excess power that needs to be reduced by the energy storage module, and send a signal indicating the excess power and switching to a constant voltage mode to the energy storage module; Wherein, the output end of the DC bus is connected to multiple charging piles.

9. A charging control device based on power mutual assistance, characterized in that: include: A memory for storing a charging control program based on power mutual assistance; A processor, configured to implement the steps of the charging control method based on power mutual assistance as described in any one of claims 1 to 7 when executing the charging control program based on power mutual assistance.

10. A computer-readable storage medium storing a computer program, characterized in that: The readable storage medium stores a charging control program based on power mutual assistance. When the charging control program based on power mutual assistance is executed by the processor, the steps of the charging control method based on power mutual assistance as described in any one of claims 1 to 7 are implemented.

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