Flexible interconnection system with alternating current and direct current multiple ports, starting method and storage medium

Abstract

The invention discloses an AC / DC multi-port flexible interconnection system, a starting method and a storage medium. The method comprises the following steps: acquiring the number of target ports in the system; determining operation modes supported by the system according to the number of the target ports to obtain multiple operation modes; obtaining a target use demand of the target object; the target object is a user of the system; selecting a target operation mode corresponding to the target use demand from a plurality of operation modes; and starting the system according to the target operation mode to enable the system to supply power to the target load. By adopting the embodiment of the invention, the safe starting of the AC / DC multi-port flexible interconnection system is realized.

Description

Technical Field

[0001] The present application relates to the technical field of power systems, and in particular to an AC / DC multi-port flexible interconnection system, a startup method, and a storage medium. Background Art

[0002] With the widespread application of renewable energy and the development of power systems, the traditional single-port power supply mode can no longer meet the needs of modern power systems.

[0003] Multi-port flexible interconnection system can realize flexible interconnection between multiple power sources and loads, and improve the reliability and flexibility of power supply. However, how to achieve safe startup of multi-port flexible interconnection system is still an urgent problem to be solved. Summary of the invention

[0004] The embodiments of the present application provide an AC / DC multi-port flexible interconnection system, a startup method, and a storage medium, which achieve safe startup of the AC / DC multi-port flexible interconnection system.

[0005] In a first aspect, an embodiment of the present application provides an AC / DC multi-port flexible interconnection system, the system comprising: a target controller, a first AC power supply, a second AC power supply, a third AC power supply, a first voltage source converter, a second voltage source converter, a third voltage source converter, a DC transformer, and a target load, wherein:

[0006] The first AC power source is connected to the first end of the first voltage source converter, and the second end of the first voltage source converter is respectively connected to the first end of the second voltage source converter, the first end of the third voltage source converter, and the first end of the DC transformer; the second end of the second voltage source converter is connected to the second AC power source; the second end of the third voltage source converter is connected to the third AC power source; and the second end of the DC transformer is connected to the target load;

[0007] The first AC power source, the second AC power source, and the third AC power source are used to provide AC power to the system; the first voltage source converter, the second voltage source converter, and the third voltage source converter are used to convert the AC power in the system into DC power to obtain target DC power; the DC transformer is used to perform voltage conversion on the target DC power to provide a suitable DC voltage for the target load;

[0008] The target controller is used to monitor the working state of the system and regulate and control the system based on the working state to achieve a flexible connection between the AC power supply in the system and the target load.

[0009] In a second aspect, an embodiment of the present application provides a method for starting an AC / DC multi-port flexible interconnection system, which is applied to the AC / DC multi-port flexible interconnection system as described in the first aspect, and the method includes:

[0010] Obtaining the number of target ports in the system;

[0011] Determining the operation modes supported by the system according to the number of the target ports to obtain multiple operation modes;

[0012] Obtaining target usage requirements of a target object; the target object is a user of the system;

[0013] Selecting a target operating mode corresponding to the target usage requirement from the multiple operating modes; the target operating mode includes one of the following: a single-end operating mode, a double-end operating mode, a three-end operating mode, and a four-end operating mode;

[0014] The system is started according to the target operation mode so that the system supplies power to the target load.

[0015] In a third aspect, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program for electronic data exchange, wherein the computer program enables a computer to execute some or all of the steps described in the second aspect of the present application.

[0016] The implementation of this application has the following beneficial effects:

[0017] It can be seen that the startup method of the AC / DC multi-port flexible interconnection system described in the present application is applied to the AC / DC multi-port flexible interconnection system, including: obtaining the target port number in the system; determining the operating mode supported by the system according to the target port number to obtain multiple operating modes; obtaining the target usage requirements of the target object; the target object is the user of the system; selecting the target operating mode corresponding to the target usage requirements from multiple operating modes; starting the system according to the target operating mode so that the system supplies power to the load. By understanding the user's needs to select the target operating mode, it is possible to avoid starting an operating mode that is not suitable for the user's needs, thereby reducing potential startup risks and further achieving safe startup of the AC / DC multi-port flexible interconnection system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background technology, the drawings required for use in the embodiments of the present application or the background technology will be described below.

[0019] Figure 1 It is a structural schematic diagram of an AC / DC multi-port flexible interconnection system provided in an embodiment of the present application;

[0020] Figure 2 It is a flow chart of a method for starting an AC / DC multi-port flexible interconnection system provided in an embodiment of the present application;

[0021] Figure 3 This is a block diagram of the functional units of a starting device for an AC / DC multi-port flexible interconnection system provided in an embodiment of the present application;

[0022] Figure 4 It is a structural schematic diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0024] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0025] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0026] The electronic device mentioned in the embodiments of the present application may include an AC / DC multi-port flexible interconnection system.

[0027] The following is an explanation of some professional terms involved in this application:

[0028] Flexible interconnection system: It is an advanced power transmission and distribution architecture, which is mainly used to achieve flexible and efficient connection between different power sources and loads; the flexible interconnection system usually has multiple ports, which can connect different types of power sources (such as AC power, DC power, renewable energy power generation equipment, etc.) and loads (such as industrial power equipment, residential power equipment, electric vehicle charging piles, etc.). These ports can be AC ​​ports, DC ports or AC / DC hybrid ports, and the connection is achieved through advanced power electronic equipment.

[0029] Voltage Source Converter (VSC): A power conversion device based on fully controlled power electronic devices (e.g. insulated gate bipolar transistors). It converts input AC power into DC power, or converts DC power into AC power, by performing high-frequency switching control on power electronic devices, thus achieving bidirectional flow and flexible control of electric energy.

[0030] Direct Current Transformer (DCT): is a DC voltage conversion device based on power electronics technology. It converts the input DC voltage into DC output voltage of different voltage levels by performing high-frequency switching control on power electronic devices, thus achieving efficient transmission and distribution of DC power.

[0031] DC bus: In the flexible interconnection system, the DC bus plays a key role in connection and energy transmission. Different power sources and loads are connected to the DC bus through power electronic converters (for example, VSC, DCT and other devices) to achieve power sharing and interaction. The DC bus has the characteristics of low loss, high reliability and flexible control, which can improve the efficiency and stability of the system.

[0032] Uncontrolled charging: refers to a relatively simple and basic charging method. Specifically, it means that during the charging process, no complex control circuit or control strategy is used to accurately control the charging current, voltage and other parameters. Instead, the power supply is directly connected to the charged device, and the power supply provides electrical energy to the charged device with its own output characteristics.

[0033] See also Figure 1 , Figure 1 It is a structural schematic diagram of an AC / DC multi-port flexible interconnection system provided in an embodiment of the present application; the AC / DC multi-port flexible interconnection system (hereinafter referred to as the system) may include: a target controller, a first AC power source AC1, a second AC power source AC2, a third AC power source AC3, a first voltage source converter VSC1, a second voltage source converter VSC2, a third voltage source converter VSC3, a DC transformer DCT, and a target load Load, wherein:

[0034] The first AC power source AC1 is connected to the first end of the first voltage source converter VSC1, and the second end of the first voltage source converter VSC1 is respectively connected to the first end of the second voltage source converter VSC2, the first end of the third voltage source converter VSC3, and the first end of the DC transformer DCT; the second end of the second voltage source converter VSC2 is connected to the second AC power source AC2; the second end of the third voltage source converter VSC3 is connected to the third AC power source AC3; the second end of the DC transformer DCT is connected to the target load Load;

[0035] In a specific embodiment, the target load Load includes at least one of the following: a DC load, a DC power supply, etc., which are not limited here; for example, Figure 1 As shown, the target load Load may include equipment such as photovoltaic power generation equipment and charging piles, among which the photovoltaic power generation equipment has both power consumption and power generation functions, so the photovoltaic power generation equipment is both a DC power source and a DC load, and the charging pile only has a power consumption function, so the charging station is only a DC load. Of course, the target load Load may also include other power-consuming equipment, which is not limited here.

[0036] It needs to be explained that a DC power supply refers to a device or system that can provide DC power; a DC load refers to a device or system that consumes DC power, and the DC load obtains electrical energy from the DC power supply during operation and converts it into other forms of energy; the second end of the first AC power supply AC1, the second end of the second AC power supply AC2, and the second end of the third AC power supply AC3 can all be grounded.

[0037] The first AC power source AC1, the second AC power source AC2, and the third AC power source AC3 are used to provide AC power to the system; the first voltage source converter VSC1, the second voltage source converter VSC2, and the third voltage source converter VSC3 are used to convert the AC power in the system into DC power to obtain the target DC power; the DC transformer DCT is used to perform voltage conversion on the target DC power to provide a suitable DC voltage for the target load Load;

[0038] The target controller is used to monitor the working state of the system and adjust and control the system based on the working state to achieve a flexible connection between the AC power supply in the system and the target load Load.

[0039] In the embodiment of the present application, the target controller may include at least one of the following: a programmable logic controller, a microprocessor, an industrial control computer, etc., which is not limited here.

[0040] In a specific embodiment, the target controller is connected to the system for communication. Figure 1It is not drawn in the figure; the target controller can collect key parameter data in real time through various sensors installed in the system. For example, a voltage or current sensor or a power sensor can be set at the output position of the AC power supply, and the output voltage of the AC power supply is monitored by the voltage sensor, the current sensor monitors the current size in the line, and the power sensor monitors the active power and reactive power of the system; based on the collected data, the target controller analyzes the working status of the system, for example, by comparing the difference between the actual voltage and the rated voltage, it determines whether the system voltage is stable and predicts possible faults. If the system working state is found to be abnormal, for example, the voltage fluctuation is too large, the target controller can maintain the voltage stability in the system by adjusting the output voltage of the VSC device or the DCT device.

[0041] Optionally, the first voltage source converter VSC1, the second voltage source converter VSC2, the third voltage source converter VSC3, and the DC transformer DCT are all connected through a DC bus; the DC bus can also be connected to an energy storage device (for example, a capacitor, a battery, etc.); the DC transformer DCT is connected to the target load Load through a low-voltage DC bus; the first voltage source converter VSC1, the second voltage source converter VSC2, and the third voltage source converter VSC3 are used to convert the AC power in the system into DC power to obtain the target DC power, which may include the following steps:

[0042] The AC power input from the first AC power source AC1 is processed by the first voltage source converter VSC1 to obtain a first DC power; the AC power input from the second AC power source AC2 is processed by the second voltage source converter VSC2 to obtain a second DC power; the AC power input from the third AC power source AC3 is processed by the third voltage source converter VSC3 to obtain a third DC power; since the VSC device is a common device, the principle of converting AC power into DC power by the VSC device will not be repeated here.

[0043] Next, the target superimposed voltages corresponding to the first direct current, the second direct current, and the third direct current can be determined. Specifically, a voltage sensor can be set on the DC bus, and the voltage sensor detects the real-time sampling of the DC bus to obtain multiple voltages, and the average value of the multiple voltages is calculated, that is, the target superimposed voltage; then, the difference voltage between the target superimposed voltage and the preset required voltage can be determined, and the specific calculation formula is as follows:

[0044] Target difference voltage = target superposition voltage - preset required voltage;

[0045] According to the above formula, the target difference voltage can be obtained; then, the target electric energy corresponding to the target difference voltage can be determined. Specifically, a mapping relationship between a preset difference voltage and electric energy can be pre-stored, and the target electric energy corresponding to the target difference voltage can be determined based on the mapping relationship; finally, the target electric energy of the first direct current, the second direct current, and the third direct current can be transmitted to the energy storage device through the DC bus. Specifically, a preset start signal can be sent to the energy storage device through the target controller to start the energy storage device to receive the electric energy on the DC bus until the electric energy received by the energy storage device is equal to the target electric energy, and then the energy storage device is turned off, so that the voltage of the DC bus is maintained near the preset required voltage to obtain the target DC power.

[0046] It should be explained that the preset demand voltage can be preset or defaulted in advance, and it refers to a desired DC bus voltage set according to user or load demand; the target electric energy refers to the specific electric energy value that needs to be extracted from the first DC power, the second DC power, and the third DC power or injected into the energy storage device in order to maintain the voltage of the DC bus near the preset demand voltage, and its unit can be watt-hour (Wh) or kilowatt-hour (kWh).

[0047] See also Figure 2 , Figure 2 This is a flow chart of a method for starting a flexible interconnection system of AC and DC multi-ports provided in an embodiment of the present application; the method is applied to the flexible interconnection system of AC and DC multi-ports, and includes:

[0048] S1. Obtain the number of target ports in the system.

[0049] In the embodiments of the present application, ports refer to different types of electrical connection points in the system, through which connection and energy interaction between various power sources, loads, and energy storage devices can be achieved.

[0050] In a specific embodiment, the circuit structure data of the system may be obtained, and the number of electrical connection points in the system, that is, the number of target ports, may be determined according to the circuit structure data. For example, Figure 1 The AC / DC multi-port flexible interconnection system shown includes four electrical connection points and 4 ports, that is, the number of target ports is four, namely the first voltage source converter, the second voltage source converter, the third voltage source converter, and the DC transformer.

[0051] S2. Determine the operation modes supported by the system according to the number of target ports to obtain multiple operation modes.

[0052] In an embodiment of the present application, after obtaining the target number of ports, the ports in the system can be classified to clarify the functions and characteristics of different types of ports. For example, the ports can be divided into AC input ports, AC output ports, DC input ports, DC output ports, energy storage ports, etc. Then, different combinations of ports of the target number of ports are analyzed to determine possible operating modes and obtain multiple operating modes. For example, assuming that the system has only one port, the system can only support a single-ended operating mode. For another example, assuming that the system has three ports, the system can support a single-ended operating mode, a dual-ended operating mode, and a three-ended operating mode.

[0053] S3. Obtain target usage requirements of a target object; the target object is a user of the system.

[0054] In the embodiment of the present application, the target usage requirement may include at least one of the following: voltage requirement, power requirement, power quality requirement, etc., which are not limited here.

[0055] In a specific embodiment, an electricity demand questionnaire can be designed for the target object. The content of the questionnaire may include the type of electrical equipment, power demand, time distribution of electricity consumption, requirements for power quality, whether there are special electricity demand, etc. Through the questionnaire survey, a large amount of basic usage demand information of the target object can be collected, thereby obtaining the target usage demand. Alternatively, the historical electricity usage data of the target object can be obtained and the target usage demand can be obtained by analyzing the historical electricity usage data.

[0056] S4. Select a target operating mode corresponding to the target usage requirement from the multiple operating modes; the target operating mode includes one of the following: a single-end operating mode, a dual-end operating mode, a three-end operating mode, and a four-end operating mode.

[0057] In an embodiment of the present application, the required number of ports for the target object can be determined according to the target usage requirements, and then the target operating mode can be determined according to the required number of ports. For example, a mapping relationship between a preset number of ports and the operating mode can be pre-stored, and the target operating mode corresponding to the required number of ports can be determined based on the mapping relationship.

[0058] S5. Start the system according to the target operation mode, so that the system supplies power to the target load.

[0059] Optionally, step S5, starting the system according to the target operation mode, may include the following steps:

[0060] A1. Select ports from the system according to the target usage requirements to obtain m ports; m is a positive integer less than or equal to the number of the target ports; each port includes one of the following: the first voltage source converter, the second voltage source converter, the third voltage source converter, and the DC transformer;

[0061] A2. Obtain a control method corresponding to each of the m ports to obtain m control methods;

[0062] A3. Determine a first startup timing according to the m control methods;

[0063] A4. According to the first startup sequence, the m ports are controlled in sequence to operate according to a corresponding control method among the m control methods to start the system.

[0064] In the embodiments of the present application, the control method may include at least one of the following: a constant voltage control method, a constant current control method, a constant reactive power control method, a constant low voltage side voltage control method, etc., which are not limited here.

[0065] In a specific embodiment, the port type required by the target object can be determined according to the target usage requirements to obtain at least one port type, and then, ports are selected from the system according to the at least one port type to obtain m ports. For example, if the target usage requirement is to supply power to a data center, and the data center requires high-quality direct current power, then the port type required by the target object may be a DC input port, and ports whose port type is a DC input port are selected from the system to obtain m ports.

[0066] Next, the control method corresponding to each of the m ports can be obtained to obtain m control methods; then, the first startup timing can be determined according to the m control methods; finally, the m ports can be controlled in sequence according to the first startup timing, and the corresponding ports can be controlled by a control method among the m control methods, thereby starting the system.

[0067] In this way, by selecting ports and corresponding control methods according to target usage requirements, it is possible to ensure that the system configuration is highly consistent with actual needs. Different target usage scenarios have different requirements for power supply type, load characteristics, power quality, etc. In this way, appropriate ports and control methods can be selected in a targeted manner, so that the system can better adapt to various complex and diverse application scenarios and improve the versatility and compatibility of the system.

[0068] Optionally, step A2, obtaining the control method corresponding to each of the m ports to obtain m control methods, may include the following steps:

[0069] B1. Obtain a target device type of a first port; the first port is any port among the m ports;

[0070] B2. determining a control method set corresponding to the first port according to the target device type;

[0071] B3. determining a first functional requirement of the system for the first port;

[0072] B4. Selecting a control method corresponding to the first port from the control method set according to the first functional requirement.

[0073] In the embodiment of the present application, the target device type of the first port can be obtained first. Specifically, the design document of the system can be obtained, and the port information of the first port can be queried from the design document, thereby obtaining the target device type; then, the control method set corresponding to the first port can be determined according to the target device type. Specifically, the mapping relationship between the preset device type and the control method set can be pre-stored, and the target control method set corresponding to the target device type can be determined based on the mapping relationship, and the target control method set is the control method set corresponding to the first port; then, the first functional requirement of the system for the first port can be determined. Specifically, the position of the first port in the system and the relationship between the first port and other ports and devices can be obtained. The first functional requirement can be determined based on the position and the relationship. For example, assuming that one side of the first port is connected to a DC power supply and the other side is connected to a data center, and the data center needs stable DC power, then the first functional requirement of the first port is to provide stable DC power to the data center. Finally, the control method corresponding to the first port can be selected from the control method set according to the first functional requirement. For example, assuming that the first functional requirement is to provide a stable voltage, then a constant voltage control method can be selected from the control method set as the control method corresponding to the first port, or the system staff can also assign a suitable control method to the first port.

[0074] In this way, by obtaining the target device type of the first port, determining the corresponding control method set, clarifying the system's functional requirements for the port, and selecting an appropriate control method, the accuracy of control can be improved, the stability and reliability of the system can be enhanced, the adaptability and flexibility of the system can be improved, and at the same time, the management and maintenance of the system can be facilitated, providing a strong guarantee for the efficient and safe operation of the AC / DC multi-port flexible interconnection system.

[0075] Optionally, step A3, determining the first startup timing according to the m control methods, may include the following steps:

[0076] C1. Determine the port priority corresponding to each of the m ports to obtain m port priorities;

[0077] C2. Determine a reference startup sequence according to the m port priorities; the greater the port priority, the earlier the startup sequence;

[0078] C3. Determine the control characteristic corresponding to each of the m control methods to obtain m control characteristics;

[0079] C4. Determine the dependency relationship between the m control methods according to the m control characteristics to obtain n dependency relationships, where n is a natural number;

[0080] C5. Adjust the reference startup timing according to the n dependencies to obtain the first startup timing.

[0081] In the embodiment of the present application, the control characteristics may include at least one of the following: constant voltage, constant current, constant power, etc., which are not limited here.

[0082] In a specific embodiment, the port priority corresponding to each of the m ports can be determined first to obtain m port priorities. Specifically, the ports can be divided into different priorities according to the importance of the load or device connected to each of the m ports, thereby obtaining m port priorities. For example, for a system that supplies power to industrial production and office areas, the power supply port connected to large-scale production equipment can be classified as a high priority, and the port connected to office computers and lighting equipment can be classified as a low priority; then, a reference startup sequence can be determined according to the m port priorities. The greater the port priority, the earlier the startup sequence.

[0083] Further, the control characteristic corresponding to each of the m control methods can be determined to obtain m control characteristics. For example, a mapping relationship between a preset control method and electric energy can be pre-stored, and the m control characteristics corresponding to the m control methods can be determined based on the mapping relationship; then, the dependency relationship between the m control methods can be determined according to the m control characteristics to obtain n dependency relationships. Starting from the first control method among the m control methods, it can be analyzed in turn whether there is a dependency relationship between it and other control methods. The basis for judgment is whether the control characteristic or normal operation of a control method directly depends on the result or condition generated by another control method. For example, assuming that in the system, the control characteristic of the reactive power control method is that the power remains unchanged, and the voltage and power of each port need to be determined. Power calculation and distribution are carried out based on the flow value, that is, the constant reactive power control method depends on the constant voltage (constant voltage control method) and / or the constant current (constant current control method); finally, the reference startup timing can be adjusted according to n dependencies to obtain the first startup timing. Specifically, the dependent control method can be placed before the control method that depends on it to ensure that the dependent control method is started before the control method that depends on it to obtain the first startup timing. For example, assuming that the reference startup timing is control method A→control method B→control method C, but control method C depends on control method B, so control method B needs to be started first before control method C can be used, then the first startup timing after adjustment is control method A→control method C→control method B.

[0084] In this way, by determining the port priority corresponding to each port in the system, the importance of each port in the system can be clearly identified, which helps to prioritize the needs of high-priority ports and achieve reasonable allocation of resources when resources are limited.

[0085] Optionally, in step S5, when the target operation mode includes the four-terminal operation mode, starting the system according to the target operation mode may include the following steps:

[0086] D1. Determine four ports in the system; the four ports include: the first voltage source converter, the second voltage source converter, the third voltage source converter, and the DC transformer;

[0087] D2. Determine that the control method of the first voltage source converter is a constant voltage control method, the control methods of the second voltage source converter and the third voltage source converter are both constant active and reactive power control methods, and the control method of the DC transformer is a constant low voltage side voltage control method;

[0088] D3, obtaining a second startup sequence corresponding to the four ports; the second startup sequence is: first starting the first voltage source converter, then starting the second voltage source converter and the third voltage source converter, and finally starting the DC transformer;

[0089] D4. Control the four ports in sequence to operate in a corresponding control method according to the second startup sequence to start the system.

[0090] In an embodiment of the present application, all ports included in the system can be determined to obtain four ports, which include: a first voltage source converter, a second voltage source converter, a third voltage source converter, and a DC transformer; then, a second startup timing corresponding to the four ports can be obtained; according to the second startup timing, the four ports are controlled in turn to operate with a corresponding control method to start the system.

[0091] Optionally, in some embodiments, when the system operates in a single-ended operation mode, the system startup process may be: a certain port may be directly selected from the system, and the port may be controlled to perform uncontrolled charging until the uncontrolled charging is completed, that is, the system startup is completed. For example, VSC1 is selected as the port, and the VSC1 is charged uncontrolled through the first AC power supply. After the uncontrolled charging is completed, the VSC1 is unlocked and a constant DC voltage control is performed. At this time, the system only relies on VSC1 to operate, and its output stable DC voltage can be used as an independent DC power supply to power the load in the system, or, when subsequently connected to other devices, as a DC voltage reference, to provide a basis for system expansion and interconnection.

[0092] Optionally, in some embodiments, when the system is in a dual-end operation mode, the system startup process may be:

[0093] Assume that the double-ended operation mode is that VSC1 and VSC2 are put into operation;

[0094] Control mode: VSC1 is constant voltage control, VSC2 is constant active and reactive power control;

[0095] Startup sequence: VSC1→VSC2;

[0096] Startup process: VSC1 is charged uncontrolled through the first AC power source. After completion, VSC1 is unlocked to perform constant DC voltage control, and then VSC2 is unlocked to interconnect the AC power sources at both ends.

[0097] Assume that the double-ended operation mode is that VSC1 and DCT are put into operation;

[0098] Control mode: VSC1 is constant voltage control, DCT is constant low voltage side voltage control;

[0099] Startup sequence: VSC1→DCT;

[0100] Startup process: First, VSC1 is charged uncontrolled through the first AC power supply. After completion, VSC1 is unlocked to perform constant DC voltage control, and then DCT is unlocked to establish the low-voltage side bus voltage.

[0101] Optionally, in some embodiments, when the system operation mode is a three-terminal operation mode, the system startup process is:

[0102] Assume that the three-terminal operation mode is that VSC1, VSC2 and DCT are put into operation;

[0103] Control mode: VSC1 is constant voltage control, VSC2 is constant active and reactive power control, and DCT is constant low voltage side voltage control;

[0104] Startup sequence: VSC1→VSC2→DCT;

[0105] Startup process: First, VSC1 is charged uncontrolled through the first AC power supply. After the uncontrolled charging is completed, VSC1 is unlocked and constant DC voltage control is performed. Then VSC2 is unlocked to achieve AC power supply interconnection. Finally, DCT is unlocked to establish the low-voltage side DC bus voltage to complete the startup.

[0106] Assume that the three-terminal operation mode is that VSC1, VSC2 and VSC3 are put into operation;

[0107] Control mode: VSC1 is constant voltage control, VSC2 is constant active and reactive power control, and VSC3 is constant low voltage side voltage control;

[0108] Startup sequence: VSC1→VSC2+VSC3;

[0109] Startup process: First, VSC1 is charged uncontrolled through the first AC power supply. After completion, VSC1 is unlocked to perform constant DC voltage control, and then VSC2 and VSC3 are unlocked to realize AC power interconnection and complete startup.

[0110] Optionally, step D4, controlling the four ports in sequence to operate in a corresponding control method according to the second startup timing to start the system, may include the following steps:

[0111] E1. Performing uncontrolled charging on the first voltage source converter through the first AC power supply until the uncontrolled charging is completed, unlocking the first voltage source converter, and performing the constant voltage control method;

[0112] E2. Unlocking the second voltage source converter and the third voltage source converter, and performing the fixed active and reactive power control method;

[0113] E3. Unlock the DC transformer and perform the fixed low-voltage side voltage control method to generate a low-voltage side DC bus voltage on the low-voltage side of the DC transformer, and the system startup is completed.

[0114] In an embodiment of the present application, the first voltage source converter can be charged uncontrollably through the first AC power supply until the uncontrolled charging is completed, thereby unlocking the current conversion function of the first voltage source converter (for example, AC to DC, DC to AC). Specifically, the unlocking is performed by the target controller sending a first preset pulse signal to the first voltage source converter to control the switching device in the first voltage source converter to conduct. After unlocking, the first voltage source converter can be controlled by a constant voltage control method.

[0115] Next, the second voltage source converter and the third voltage source converter can be unlocked. Similarly, the target controller can send a second preset pulse signal to the second voltage source converter, and send a third preset pulse signal to the third voltage source converter to unlock the current conversion function of the second voltage source converter and the third voltage source converter. After unlocking, the second voltage source converter and the third voltage source converter can be controlled by a fixed active and reactive power control method; finally, the target controller can send a fourth preset pulse signal to the DC transformer to unlock the voltage conversion function of the DC transformer, and control the DC transformer by a fixed low-voltage side voltage control method, thereby generating a low-voltage side DC bus voltage on the low-voltage side of the DC transformer (the side connected to the target load), and the system startup is completed.

[0116] In this way, the first voltage source converter is charged uncontrolled by the first AC power supply. This method does not require complex control circuits and precise charging control strategies. The charging process is relatively simple and direct, and can quickly charge the capacitors and other energy storage elements of the first voltage source converter, so that it can reach a working state as soon as possible, thereby accelerating the startup speed of the system.

[0117] Optionally, step E1, performing uncontrolled charging on the first voltage source converter by using the first AC power supply until the uncontrolled charging is completed, may include the following steps:

[0118] F1. Obtain a first converter model corresponding to the first voltage source converter;

[0119] F2. Determine a first unlocking voltage and a first voltage threshold corresponding to the first converter model;

[0120] F3. Determine a difference between the first unlocking voltage and the first voltage threshold to obtain a first voltage difference;

[0121] F4. determining a first ratio according to the first voltage difference and the first voltage threshold;

[0122] F5. Obtaining a target usage time of the first voltage source converter;

[0123] F6. Determine the target attenuation factor corresponding to the target usage duration;

[0124] F7. Adjust the first voltage threshold according to the target attenuation factor to obtain a second voltage threshold;

[0125] F8. Determine a difference between the first unlocking voltage and the second power supply threshold to obtain a second voltage difference;

[0126] F9. determining a second ratio according to the second voltage difference and the second voltage threshold;

[0127] F10. determining a difference between the first ratio and the second ratio to obtain a target difference;

[0128] F11, determining a target adjustment coefficient corresponding to the target difference;

[0129] F12. adjusting the first unlocking voltage according to the target adjustment coefficient to obtain a second unlocking voltage;

[0130] F13. Perform uncontrolled charging on the first voltage source converter through the first AC power supply so that the voltage of the first voltage source converter reaches the second unlocking voltage, and the uncontrolled charging is completed.

[0131] In the embodiment of the present application, the first voltage threshold represents the voltage upper limit when the first voltage source converter operates normally.

[0132] In a specific embodiment, the first converter model corresponding to the first voltage source converter may be first obtained. Specifically, the target controller may query the device information of the first voltage source converter from the design document of the system, thereby obtaining the first converter model; then, the first unlocking voltage and the first voltage threshold corresponding to the first converter model may be determined. For example, a mapping relationship between a preset converter model and an unlocking voltage and a voltage threshold may be pre-stored, and the first unlocking voltage and the first voltage threshold corresponding to the first converter model may be determined based on the mapping relationship; then, the difference between the first unlocking voltage and the first voltage threshold may be calculated and determined. The specific calculation formula is as follows:

[0133] First voltage difference=first unlocking voltage-first voltage threshold;

[0134] According to the above formula, the first voltage difference can be obtained; further, the first ratio can be determined according to the first voltage difference and the first voltage threshold, and the specific calculation formula is as follows:

[0135] First ratio=first voltage difference / first voltage threshold;

[0136] According to the above formula, the first ratio can be obtained; then, the target usage time of the first voltage source converter can be obtained. Specifically, the factory time of the first voltage source converter and the current time can be obtained, and the target usage time can be obtained by subtracting the factory time from the current time; then, the target attenuation factor corresponding to the target usage time can be determined. Specifically, the mapping relationship between the preset usage time and the attenuation factor can be pre-stored, and the target attenuation factor corresponding to the target usage time is determined based on the mapping relationship, wherein the value range of the target attenuation factor can be -0.3 to 0; then, the first voltage threshold can be adjusted according to the target attenuation factor, and the specific calculation formula is as follows:

[0137] Second voltage threshold=first voltage threshold*(1+target attenuation factor);

[0138] According to the above formula, the second voltage threshold can be obtained; then, the second voltage difference can be obtained by subtracting the second power threshold from the first unlocking voltage; then, calculation can be performed based on the second voltage difference and the second voltage threshold. The specific calculation formula is as follows:

[0139] Second ratio=second voltage difference / second voltage threshold;

[0140] According to the above formula, the second ratio can be obtained; then, the target difference can be obtained by subtracting the second ratio from the first ratio; then, the target adjustment coefficient corresponding to the target difference can be determined, for example, a mapping relationship between a preset difference and an adjustment coefficient can be pre-stored, and the target adjustment coefficient corresponding to the target difference can be determined based on the mapping relationship, wherein the value range of the target adjustment coefficient can be -0.2 to 0.2; further, the first unlocking voltage can be adjusted according to the target adjustment coefficient, and the specific calculation formula is as follows:

[0141] Second unlocking voltage = first unlocking voltage * (1 + target adjustment coefficient);

[0142] The second unlocking voltage can be obtained according to the above formula; finally, the first voltage source converter can be charged uncontrolled by the first AC power supply, and when the voltage of the first voltage source converter reaches the second unlocking voltage, it is determined that the uncontrolled charging is completed.

[0143] The implementation of this application has the following beneficial effects:

[0144] It can be seen that the startup method of the AC / DC multi-port flexible interconnection system described in the present application is applied to the AC / DC multi-port flexible interconnection system, including: obtaining the target port number in the system; determining the operating mode supported by the system according to the target port number to obtain multiple operating modes; obtaining the target usage requirements of the target object; the target object is the user of the system; selecting the target operating mode corresponding to the target usage requirements from multiple operating modes; starting the system according to the target operating mode so that the system supplies power to the load. By understanding the user's needs to select the target operating mode, it is possible to avoid starting an operating mode that is not suitable for the user's needs, thereby reducing potential startup risks and further achieving safe startup of the AC / DC multi-port flexible interconnection system.

[0145] See also Figure 3 , Figure 3 This is a functional unit composition block diagram of a starting device 300 of an AC / DC multi-port flexible interconnection system provided in an embodiment of the present application; the starting device 300 of the AC / DC multi-port flexible interconnection system is applied to the AC / DC multi-port flexible interconnection system described in any of the above embodiments, and the starting device 300 of the AC / DC multi-port flexible interconnection system includes: an acquisition unit 301, a control unit 302, and a starting unit 303, wherein:

[0146] The acquisition unit 301 is used to acquire the number of target ports in the system;

[0147] The control unit 302 is used to determine the operation modes supported by the system according to the number of target ports to obtain multiple operation modes;

[0148] The acquisition unit 301 is further used to acquire the target usage requirements of the target object; the target object is the user of the system;

[0149] The control unit 302 further selects a target operation mode corresponding to the target usage requirement from the multiple operation modes; the target operation mode includes one of the following: a single-end operation mode, a double-end operation mode, a three-end operation mode, and a four-end operation mode;

[0150] The starting unit 303 is used to start the system according to the target operation mode, so that the system supplies power to the target load.

[0151] Optionally, in the aspect of starting the system according to the target operation mode, the starting unit 303 is specifically used to:

[0152] Selecting ports from the system according to the target usage requirements to obtain m ports; m is a positive integer less than or equal to the target number of ports; each port includes one of the following: the first voltage source converter, the second voltage source converter, the third voltage source converter, and the DC transformer;

[0153] Obtaining a control method corresponding to each of the m ports to obtain m control methods;

[0154] Determine a first startup timing according to the m control methods;

[0155] The m ports are controlled in sequence according to the first startup sequence to operate according to a corresponding control method among the m control methods, so as to start the system.

[0156] Optionally, in the aspect of acquiring the control method corresponding to each of the m ports to obtain the m control methods, the acquiring unit 301 is specifically configured to:

[0157] Obtaining a target device type of a first port; the first port being any port among the m ports;

[0158] Determining a control method set corresponding to the first port according to the target device type;

[0159] determining a first functional requirement of the system for the first port;

[0160] A control method corresponding to the first port is selected from the control method set according to the first functional requirement.

[0161] Optionally, in determining the first startup sequence according to the m control methods, the startup unit 303 is specifically configured to:

[0162] Determine the port priority corresponding to each port in the m ports to obtain m port priorities;

[0163] Determine a reference startup timing according to the m port priorities; the greater the port priority, the earlier the startup timing;

[0164] Determine a control characteristic corresponding to each of the m control methods to obtain m control characteristics;

[0165] Determine the dependency relationship between the m control methods according to the m control characteristics to obtain n dependency relationships, where n is a natural number;

[0166] The reference startup timing is adjusted according to the n dependencies to obtain the first startup timing.

[0167] Optionally, when the target operation mode includes the four-terminal operation mode, the system is started according to the target operation mode, and the starting unit 303 is specifically used to:

[0168] Determine four ports in the system; the four ports include: the first voltage source converter, the second voltage source converter, the third voltage source converter, and the DC transformer;

[0169] Determine that the control method of the first voltage source converter is a constant voltage control method, the control methods of the second voltage source converter and the third voltage source converter are both constant active and reactive power control methods, and the control method of the DC transformer is a constant low voltage side voltage control method;

[0170] Obtaining a second startup sequence corresponding to the four ports; the second startup sequence is: first starting the first voltage source converter, then starting the second voltage source converter and the third voltage source converter, and finally starting the DC transformer;

[0171] The four ports are controlled in sequence to operate in a corresponding control method according to the second startup sequence to start the system.

[0172] Optionally, in the aspect of sequentially controlling the four ports to operate in a corresponding control method according to the second startup timing to start the system, the startup unit 303 is specifically used for:

[0173] Performing uncontrolled charging on the first voltage source converter by using the first AC power supply until the uncontrolled charging is completed, unlocking the first voltage source converter, and performing the constant voltage control method;

[0174] Unlocking the second voltage source converter and the third voltage source converter, and performing the fixed active and reactive power control method;

[0175] The DC transformer is unlocked, and the fixed low-voltage side voltage control method is performed to generate a low-voltage side DC bus voltage on the low-voltage side of the DC transformer, and the system startup is completed.

[0176] Optionally, in the aspect of performing uncontrolled charging on the first voltage source converter by using the first AC power supply until the uncontrolled charging is completed, the starting unit 303 is specifically used to:

[0177] Obtaining a first converter model corresponding to the first voltage source converter;

[0178] Determining a first unlocking voltage and a first voltage threshold corresponding to the first converter model;

[0179] determining a difference between the first unlocking voltage and the first voltage threshold to obtain a first voltage difference;

[0180] determining a first ratio according to the first voltage difference and the first voltage threshold;

[0181] Obtaining a target usage time of the first voltage source converter;

[0182] Determine a target attenuation factor corresponding to the target usage duration;

[0183] Adjusting the first voltage threshold according to the target attenuation factor to obtain a second voltage threshold;

[0184] determining a difference between the first unlocking voltage and the second power supply threshold to obtain a second voltage difference;

[0185] determining a second ratio according to the second voltage difference and the second voltage threshold;

[0186] determining a difference between the first ratio and the second ratio to obtain a target difference;

[0187] Determining a target adjustment coefficient corresponding to the target difference;

[0188] Adjusting the first unlocking voltage according to the target adjustment coefficient to obtain a second unlocking voltage;

[0189] The first voltage source converter is charged uncontrolledly through the first AC power supply so that the voltage of the first voltage source converter reaches the second unlocking voltage, and the uncontrolled charging is completed.

[0190] In a specific implementation, the starting device 300 of the AC / DC multi-port flexible interconnection system described in the embodiment of the present invention can also execute other implementations described in the starting method of the AC / DC multi-port flexible interconnection system provided by the above embodiment of the present invention, which will not be repeated here.

[0191] See also Figure 4 , Figure 4 It is a structural schematic diagram of an electronic device provided in an embodiment of the present application, the electronic device includes a processor, a memory, a communication interface and one or more programs, the processor, the memory and the communication interface are interconnected through a bus, the one or more programs are stored in the memory and are configured to be executed by the processor, the one or more programs include instructions for executing other implementations described in the startup method of the AC / DC multi-port flexible interconnection system provided in the above embodiment of the present invention, which will not be repeated here.

[0192] An embodiment of the present application also provides a computer storage medium, wherein the computer storage medium stores a computer program for electronic data exchange, wherein the computer program enables a computer to execute part or all of the steps of any method described in the above method embodiments, and the above computer includes an electronic device.

[0193] The embodiment of the present application also provides a computer program product, the computer program product includes a non-transitory computer-readable storage medium storing a computer program, the computer program is operable to cause a computer to execute some or all of the steps of any method described in the above method embodiment. The computer program product can be a software installation package, and the computer includes a charging device.

[0194] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described order of actions, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0195] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0196] In the several embodiments provided in the present application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are only schematic, such as the division of the above-mentioned units, which is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection of devices or units can be electrical or other forms.

[0197] The units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0198] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0199] If the above-mentioned integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable memory. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a memory, including a number of instructions to enable a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the above-mentioned methods of each embodiment of the present application. The aforementioned memory includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, disk or CD-ROM and other media that can store program codes.

[0200] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for general technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. An AC / DC multi-port flexible interconnection system, characterized in that: The system comprises: a target controller, a first AC power source, a second AC power source, a third AC power source, a first voltage source converter, a second voltage source converter, a third voltage source converter, a DC transformer, and a target load, wherein: The first AC power source is connected to the first end of the first voltage source converter, and the second end of the first voltage source converter is respectively connected to the first end of the second voltage source converter, the first end of the third voltage source converter, and the first end of the DC transformer; the second end of the second voltage source converter is connected to the second AC power source; the second end of the third voltage source converter is connected to the third AC power source; and the second end of the DC transformer is connected to the target load; The first AC power source, the second AC power source, and the third AC power source are used to provide AC power to the system; the first voltage source converter, the second voltage source converter, and the third voltage source converter are used to convert the AC power in the system into DC power to obtain target DC power; the DC transformer is used to perform voltage conversion on the target DC power to provide a suitable DC voltage for the target load; The target controller is used to monitor the working state of the system and regulate and control the system based on the working state to achieve a flexible connection between the AC power supply in the system and the target load.

2. The system according to claim 1, characterized in that The first voltage source converter, the second voltage source converter, the third voltage source converter, and the DC transformer are all connected through a DC bus; the DC bus is also connected to an energy storage device; the DC transformer is connected to the target load through a low-voltage DC bus; the first voltage source converter, the second voltage source converter, and the third voltage source converter are used to convert the AC power in the system into DC power to obtain the target DC power, including: Processing the alternating current input by the first alternating current power supply through the first voltage source converter to obtain a first direct current; Processing the alternating current input by the second alternating current power supply through the second voltage source converter to obtain a second direct current; Processing the alternating current input by the third alternating current power supply through the third voltage source converter to obtain a third direct current; Determine target superposition voltages corresponding to the first direct current, the second direct current, and the third direct current; Determine a difference voltage between the target superposition voltage and a preset required voltage to obtain a target difference voltage; Determining a target electric energy corresponding to the target difference voltage; The target electric energy of the first direct current, the second direct current, and the third direct current is transmitted to the energy storage device through the direct current bus to obtain the target direct current.

3. A method for starting an AC / DC multi-port flexible interconnection system, characterized in that: Applied to the AC / DC multi-port flexible interconnection system as claimed in claim 1 or 2, the method comprising: Obtaining the number of target ports in the system; Determining the operation modes supported by the system according to the number of the target ports to obtain multiple operation modes; Obtaining target usage requirements of a target object; the target object is a user of the system; Selecting a target operating mode corresponding to the target usage requirement from the multiple operating modes; the target operating mode includes one of the following: a single-end operating mode, a double-end operating mode, a three-end operating mode, and a four-end operating mode; The system is started according to the target operation mode so that the system supplies power to the target load.

4. The method according to claim 3, characterized in that The starting the system according to the target operation mode includes: Selecting ports from the system according to the target usage requirements to obtain m ports; m is a positive integer less than or equal to the target number of ports; each port includes one of the following: the first voltage source converter, the second voltage source converter, the third voltage source converter, and the DC transformer; Obtaining a control method corresponding to each of the m ports to obtain m control methods; Determine a first startup timing according to the m control methods; The m ports are controlled in sequence according to the first startup sequence to operate according to a corresponding control method among the m control methods, so as to start the system.

5. The method according to claim 4, characterized in that The acquiring the control method corresponding to each of the m ports to obtain the m control methods includes: Obtaining a target device type of a first port; the first port being any port among the m ports; Determining a control method set corresponding to the first port according to the target device type; determining a first functional requirement of the system for the first port; A control method corresponding to the first port is selected from the control method set according to the first functional requirement.

6. The method according to claim 4, characterized in that The determining a first startup timing according to the m control methods comprises: Determine the port priority corresponding to each port in the m ports to obtain m port priorities; Determine a reference startup timing according to the m port priorities; the greater the port priority, the earlier the startup timing; Determine a control characteristic corresponding to each of the m control methods to obtain m control characteristics; Determine the dependency relationship between the m control methods according to the m control characteristics to obtain n dependency relationships, where n is a natural number; The reference startup timing is adjusted according to the n dependencies to obtain the first startup timing.

7. The method according to any one of claims 3 to 6, characterized in that: When the target operation mode includes the four-terminal operation mode, starting the system according to the target operation mode includes: Determine four ports in the system; the four ports include: the first voltage source converter, the second voltage source converter, the third voltage source converter, and the DC transformer; Determine that the control method of the first voltage source converter is a constant voltage control method, the control methods of the second voltage source converter and the third voltage source converter are both constant active and reactive power control methods, and the control method of the DC transformer is a constant low voltage side voltage control method; Obtaining a second startup sequence corresponding to the four ports; the second startup sequence is: first starting the first voltage source converter, then starting the second voltage source converter and the third voltage source converter, and finally starting the DC transformer; The four ports are controlled in sequence to operate in a corresponding control method according to the second startup sequence to start the system.

8. The method according to claim 7, characterized in that The controlling the four ports in sequence to operate in a corresponding control method according to the second startup timing to start the system includes: Performing uncontrolled charging on the first voltage source converter by using the first AC power supply until the uncontrolled charging is completed, unlocking the first voltage source converter, and performing the constant voltage control method; Unlocking the second voltage source converter and the third voltage source converter, and performing the fixed active and reactive power control method; The DC transformer is unlocked, and the fixed low-voltage side voltage control method is performed to generate a low-voltage side DC bus voltage on the low-voltage side of the DC transformer, and the system startup is completed.

9. The method according to claim 8, characterized in that The step of performing uncontrolled charging on the first voltage source converter by using the first AC power supply until the uncontrolled charging is completed includes: Obtaining a first converter model corresponding to the first voltage source converter; Determining a first unlocking voltage and a first voltage threshold corresponding to the first converter model; determining a difference between the first unlocking voltage and the first voltage threshold to obtain a first voltage difference; determining a first ratio according to the first voltage difference and the first voltage threshold; Obtaining a target usage time of the first voltage source converter; Determine a target attenuation factor corresponding to the target usage duration; Adjusting the first voltage threshold according to the target attenuation factor to obtain a second voltage threshold; determining a difference between the first unlocking voltage and the second power supply threshold to obtain a second voltage difference; determining a second ratio according to the second voltage difference and the second voltage threshold; determining a difference between the first ratio and the second ratio to obtain a target difference; Determining a target adjustment coefficient corresponding to the target difference; Adjusting the first unlocking voltage according to the target adjustment coefficient to obtain a second unlocking voltage; The first voltage source converter is charged uncontrolledly through the first AC power supply so that the voltage of the first voltage source converter reaches the second unlocking voltage, and the uncontrolled charging is completed.

10. A computer-readable storage medium, characterized in that: A computer program for electronic data exchange is stored, wherein the computer program enables a computer to execute the method according to any one of claims 3 to 9.

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