Charging system, charging system control method, electronic device, and storage medium

Abstract

Provided in the embodiments of the present application are a charging system, a charging system control method, an electronic device and a storage medium. The charging system comprises: a direct-current busbar, a bidirectional direct-current conversion module, and at least two direct-current source systems, wherein when switching to connecting the direct-current busbar and one direct-current source system, the bidirectional direct-current conversion module is used for converting the direct current from the direct-current source system and outputting the converted direct current to the direct-current busbar, or converting the direct current from the direct-current busbar, and outputting the converted direct current to the direct-current source system; and when switching to connecting one direct-current source system with the other direct-current source system, the bidirectional direct-current conversion module is used for converting the direct current from one direct-current source system and outputting the converted direct current to the other direct-current source system. Therefore, the bidirectional direct-current conversion module can be reused, thereby increasing the utilization rate of modules and reducing the number of modules in a system architecture.

Description

A charging system, a charging system control method, an electronic device, and a storage medium.

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202411542597.2, filed on October 30, 2024, entitled “Charging System and Control Method Thereof”, and to Chinese Patent Application No. 202411549005.X, filed on October 30, 2024, entitled “A Charging System, a Charging System Control Method, an Electronic Device and a Storage Medium”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of charging technology, and in particular to a charging system, a charging system control method, an electronic device, and a storage medium. Background Technology

[0004] With the rapid development of the new energy industry, the popularity of new energy products such as electric vehicles is increasing, leading to a greater demand for electricity and other energy sources. To meet the ever-growing charging needs of electric vehicles, more charging equipment needs to be deployed. The charging system of this equipment mainly consists of AC power systems and DC power supply systems. The voltage of each charging circuit is converted by an AC-DC module (a DC-AC converter used to convert AC to DC) and / or a DC-DC module (a DC converter used to convert DC power from one voltage level to another) before being output. However, existing charging systems equip each DC power supply system with a dedicated DC-DC module, resulting in low utilization of these modules.

[0005] Furthermore, to meet the increasing power demands of electric vehicles, more charging stations need to be deployed. The integration of numerous charging stations into the charging system (e.g., a charging system composed of AC power supply branches, photovoltaic power supply branches, and pure energy storage power supply branches) not only places higher demands on the safety of the charging system but also on its stability. In related technologies, the connection relationships between the AC power supply branches, photovoltaic power supply branches, and / or pure energy storage power supply branches in the charging system and the charging stations (or loads) are often chaotic, resulting in poor system stability. Summary of the Invention

[0006] To address the aforementioned issues, embodiments of this application disclose a charging system, a charging system control method, an electronic device, and a storage medium.

[0007] In a first aspect, some embodiments of this application provide a charging system, including: a DC bus, a bidirectional DC-DC converter module, and at least two DC source systems;

[0008] The bidirectional DC-DC converter module, when switched to connect a DC bus and a DC source system, is used to convert the DC power from one DC source system and output the converted DC power to the DC bus; or, it converts the DC power from the DC bus and outputs the converted DC power to a DC source system; when switched to connect between one DC source system and another DC source system, it is used to convert the DC power from one DC source system and output the converted DC power to the other DC source system.

[0009] In some embodiments, the charging system further includes: an AC-DC conversion module;

[0010] An AC-DC conversion module connects a DC bus and an AC power system, and is used to convert AC power from the AC power system into DC power and output it to the DC bus.

[0011] In some embodiments, the charging system further includes: a unidirectional DC-DC converter module and a charging terminal;

[0012] The unidirectional DC-DC converter module connects the DC bus and the charging terminal, and is used to convert the DC power from the DC bus and output the converted DC power to the charging terminal.

[0013] In some embodiments, at least two DC source systems include an energy storage system and a photovoltaic system, and the bidirectional DC conversion module includes a first bidirectional DC conversion module; the first bidirectional DC conversion module is connected to the DC bus and the energy storage system or the DC bus and the photovoltaic system; or, the first bidirectional DC conversion module is connected to the energy storage system and the photovoltaic system.

[0014] In some embodiments, when the first bidirectional DC-DC converter module connects the energy storage system to the DC bus, the AC power system is used to supply power to the energy storage system.

[0015] When the first bidirectional DC-DC converter module is connected to the energy storage system and the DC bus, the energy storage system is used to supply power to the charging terminal.

[0016] When the first bidirectional DC-DC conversion module connects the photovoltaic system to the DC bus, the photovoltaic system is used to supply power to the charging terminal;

[0017] When the first bidirectional DC-DC conversion module connects the photovoltaic system to the DC bus, the photovoltaic system is also used to supply power to the AC power system;

[0018] When the first bidirectional DC-DC converter module connects the photovoltaic system and the energy storage system, the photovoltaic system is used to supply power to the energy storage system.

[0019] In some embodiments, when the first bidirectional DC-DC converter module connects the energy storage system to the DC bus, the AC power system is used to supply power to the energy storage system through the AC-DC converter module, the DC bus and the first bidirectional DC-DC converter module.

[0020] Alternatively, when the first bidirectional DC-DC converter module connects the energy storage system to the DC bus, the energy storage system is used to supply power to the charging terminal through the first bidirectional DC-DC converter module, the DC bus, and the unidirectional DC-DC converter module.

[0021] Alternatively, when the first bidirectional DC-DC conversion module connects the photovoltaic system to the DC bus, the photovoltaic system is used to supply power to the charging terminal through the first bidirectional DC-DC conversion module, the DC bus, and the unidirectional DC-DC conversion module;

[0022] Alternatively, when the first bidirectional DC-DC conversion module connects the photovoltaic system to the DC bus, the photovoltaic system is also used to supply power to the AC power system through the first bidirectional DC-DC conversion module, the DC bus, and the AC-DC conversion module;

[0023] Alternatively, when the first bidirectional DC-DC converter module connects the photovoltaic system and the energy storage system, the photovoltaic system is used to supply power to the energy storage system through the first bidirectional DC-DC converter module.

[0024] In some embodiments, the charging system further includes: a plurality of disconnection devices;

[0025] Multiple disconnection devices are used to connect the DC bus, the first bidirectional DC-DC conversion module, the photovoltaic system, and the energy storage system.

[0026] In some embodiments, a plurality of disconnecting devices are used to connect the DC bus and the first bidirectional DC-DC converter module, and / or connect the first bidirectional DC-DC converter module with the photovoltaic system or the first bidirectional DC-DC converter module with the energy storage system, and / or connect the photovoltaic system with the energy storage system.

[0027] In some embodiments, the plurality of disconnecting devices include: a first disconnecting device, a second disconnecting device, a third disconnecting device, and a fourth disconnecting device;

[0028] The first disconnecting device is connected to the DC bus at one end and to the first bidirectional DC conversion module at the other end.

[0029] The second disconnecting device is connected at one end to the first bidirectional DC-DC converter module and at the other end to the energy storage system;

[0030] The third disconnecting device is connected at one end to the connection point of the second disconnecting device and the first bidirectional DC-DC conversion module, and at the other end to the photovoltaic system.

[0031] The fourth disconnecting device is connected at one end to the connection point of the second disconnecting device and the energy storage system, and at the other end to the connection point of the first disconnecting device and the first bidirectional DC-DC conversion module.

[0032] In some embodiments, when the fourth disconnecting device and the third disconnecting device are disconnected, and the second disconnecting device and the first disconnecting device are closed, the energy storage system is connected to the DC bus through the first bidirectional DC-DC conversion module.

[0033] When the fourth disconnecting device and the second disconnecting device are disconnected, and the third disconnecting device and the first disconnecting device are closed, the photovoltaic system is connected to the DC bus through the first bidirectional DC conversion module.

[0034] When the second disconnecting device and the first disconnecting device are disconnected, and the fourth disconnecting device and the third disconnecting device are closed, the photovoltaic system is connected to the energy storage system through the first bidirectional DC-DC conversion module.

[0035] In some embodiments, when the first disconnecting device and the fourth disconnecting device are closed, and the second disconnecting device and the third disconnecting device are open, the energy storage system is connected to the DC bus; the energy storage system is used to supply power to the AC power system through the DC bus and the AC-DC conversion module.

[0036] In some embodiments, the bidirectional DC-DC converter module further includes a second bidirectional DC-DC converter module; the second bidirectional DC-DC converter module is connected to the DC bus and the energy storage system.

[0037] The AC power system is also used to supply power to the energy storage system through AC-DC conversion modules, DC buses, and a second bidirectional DC conversion module;

[0038] Alternatively, the energy storage system can also be used to power the charging terminal through a second bidirectional DC-DC converter module, a DC bus, and a unidirectional DC-DC converter module.

[0039] In some embodiments, the AC power system is also used to supply power to the charging terminal through an AC-DC conversion module, a DC bus, and a unidirectional DC conversion module.

[0040] In some embodiments, when the power demand of the charging terminal is greater than or equal to a power threshold, the AC power system is used to supply power to the charging terminal through the AC-DC conversion module, the DC bus, and the unidirectional DC conversion module; the energy storage system is used to supply power to the charging terminal through the second bidirectional DC conversion module, the DC bus, and the unidirectional DC conversion module; and the photovoltaic system is used to supply power to the charging terminal through the first bidirectional DC conversion module, the DC bus, and the unidirectional DC conversion module.

[0041] Alternatively, when the power demand of the charging terminal is greater than or equal to the power threshold, the AC power system is used to supply power to the charging terminal through the AC-DC conversion module, the DC bus, and the unidirectional DC conversion module; the energy storage system is used to supply power to the charging terminal through the first bidirectional DC conversion module, the DC bus, and the unidirectional DC conversion module.

[0042] In some embodiments, when the power demand of the charging terminal is greater than zero and less than the power threshold, the AC power system is used to supply power to the charging terminal through the AC-DC conversion module, the DC bus and the unidirectional DC conversion module;

[0043] Alternatively, the energy storage system can be used to power the charging terminal through a second bidirectional DC-DC converter module, a DC bus, and a unidirectional DC-DC converter module;

[0044] Alternatively, the energy storage system is used to power the charging terminal through a first bidirectional DC-DC converter module, a DC bus, and a unidirectional DC-DC converter module;

[0045] Alternatively, the photovoltaic system is used to power the charging terminal through a first bidirectional DC-DC converter module, a DC bus, and a unidirectional DC-DC converter module.

[0046] In some embodiments, when the power demand of the charging terminal is zero, the AC power system is used to supply power to the energy storage system through the AC-DC conversion module, the DC bus, and the second bidirectional DC conversion module;

[0047] Alternatively, the AC power system is used to supply power to the energy storage system through the AC-DC conversion module, the DC bus, the first bidirectional DC conversion module and the second bidirectional DC conversion module;

[0048] Alternatively, the energy storage system can be used to supply power to the AC power system via a DC bus and an AC-DC conversion module;

[0049] Alternatively, the photovoltaic system is used to supply power to the AC power system through a first bidirectional DC-DC conversion module, a DC bus, and an AC-DC conversion module;

[0050] Alternatively, the photovoltaic system can be used to power the energy storage system via a first bidirectional DC-DC converter module.

[0051] In some embodiments, the DC bus includes a first DC bus and a second DC bus;

[0052] A portion of the AC-DC conversion module, a portion of the bidirectional DC conversion module, and a portion of the unidirectional DC conversion module are connected to the first DC bus; another portion of the AC-DC conversion module, another portion of the bidirectional DC conversion module, and another portion of the unidirectional DC conversion module are connected to the second DC bus.

[0053] In some embodiments, the charging system further includes: a fifth disconnection device;

[0054] One end of the fifth disconnecting device is connected to the first DC bus, and the other end is connected to the second DC bus.

[0055] In some embodiments, the charging system further includes: a power distribution module;

[0056] The power distribution module connects the unidirectional DC-DC converter module and the charging terminal, and is used to distribute the DC power output by the unidirectional DC-DC converter module to the charging terminal.

[0057] Secondly, some embodiments of this application provide a charging system control method, applied to the charging system of the first aspect, the method comprising:

[0058] Switching a DC power source system to be connected to a DC bus via a bidirectional DC-DC conversion module and controlling a DC power source system to supply power to an AC power system, or controlling an AC power system to supply power to a DC power source system;

[0059] Alternatively, one DC power source system can be switched to connect with another DC power source system via a bidirectional DC-DC converter module, and one DC power source system can be controlled to supply power to the other DC power source system.

[0060] In some embodiments, the method further includes:

[0061] The AC power from the AC power system is converted into DC power through an AC-DC conversion module and then output to the DC bus.

[0062] In some embodiments, the method further includes:

[0063] The DC power from the DC bus is converted by a unidirectional DC-DC converter module, and the converted DC power is output to the charging terminal.

[0064] In some embodiments, at least two DC source systems include an energy storage system and a photovoltaic system, and the bidirectional DC conversion module includes a first bidirectional DC conversion module; the first bidirectional DC conversion module is connected to the DC bus and the energy storage system or the DC bus and the photovoltaic system; or, the first bidirectional DC conversion module is connected to the energy storage system and the photovoltaic system.

[0065] In some embodiments, switching a DC power source system to be connected to a DC bus via a bidirectional DC-DC converter module and controlling the DC power source system to supply power to an AC power system, or controlling the AC power system to supply power to a DC power source system, includes:

[0066] When the first bidirectional DC-DC converter module connects the energy storage system to the DC bus, it supplies power to the energy storage system through the AC power system.

[0067] When the first bidirectional DC-DC conversion module is connected to the photovoltaic system and the DC bus, it supplies power to the AC power system through the photovoltaic system.

[0068] Switching one DC power source system to connect with another DC power source system via a bidirectional DC-DC converter module, and controlling one DC power source system to supply power to the other DC power source system, includes:

[0069] When the first bidirectional DC-DC converter module connects the photovoltaic system and the energy storage system, it supplies power to the energy storage system through the photovoltaic system.

[0070] The DC power from the DC bus is converted using a unidirectional DC-DC converter module, and the converted DC power is output to the charging terminal, including:

[0071] When the first bidirectional DC-DC conversion module is connected to the photovoltaic system and the DC bus, the photovoltaic system supplies power to the charging terminal.

[0072] When the first bidirectional DC-DC converter module is connected to the energy storage system and the DC bus, it supplies power to the charging terminal through the energy storage system.

[0073] In some embodiments, when the first bidirectional DC-DC converter module connects the energy storage system to the DC bus, it supplies power to the energy storage system through the AC power system, including:

[0074] When the first bidirectional DC-DC converter module connects the energy storage system to the DC bus, it supplies power to the energy storage system through the AC power system, the AC-DC converter module, the DC bus, and the first bidirectional DC-DC converter module.

[0075] When the first bidirectional DC-DC conversion module is connected to the photovoltaic system and the DC bus, it supplies power to the AC power system through the photovoltaic system, including:

[0076] When the first bidirectional DC-DC converter module is connected to the photovoltaic system and the DC bus, it supplies power to the AC power system through the photovoltaic system, the first bidirectional DC-DC converter module, the DC bus, and the AC-DC converter module.

[0077] When the first bidirectional DC-DC converter module connects the photovoltaic system and the energy storage system, the photovoltaic system is used to supply power to the energy storage system, including:

[0078] When the first bidirectional DC-DC converter module connects the photovoltaic system and the energy storage system, it supplies power to the energy storage system through the photovoltaic system and the first bidirectional DC-DC converter module.

[0079] When the first bidirectional DC-DC conversion module connects the photovoltaic system to the DC bus, the photovoltaic system is used to supply power to the charging terminal, including:

[0080] When the first bidirectional DC-DC converter module connects the photovoltaic system and the DC bus, the charging terminal is powered through the photovoltaic system, the first bidirectional DC-DC converter module, the DC bus, and the unidirectional DC-DC converter module.

[0081] When the first bidirectional DC-DC converter module is connected to the energy storage system and the DC bus, the energy storage system is used to supply power to the charging terminal, including:

[0082] When the first bidirectional DC-DC converter module is connected to the energy storage system and the DC bus, it supplies power to the charging terminal through the energy storage system, the first bidirectional DC-DC converter module, the DC bus, and the unidirectional DC-DC converter module.

[0083] In some embodiments, the charging system further includes: a plurality of disconnection devices;

[0084] Multiple disconnection devices are used to connect the DC bus, the first bidirectional DC-DC conversion module, the photovoltaic system, and the energy storage system.

[0085] In some embodiments, a plurality of disconnecting devices are used to connect the DC bus and the first bidirectional DC-DC converter module, and / or connect the first bidirectional DC-DC converter module with the photovoltaic system or the first bidirectional DC-DC converter module with the energy storage system, and / or connect the photovoltaic system with the energy storage system.

[0086] In some embodiments, the plurality of disconnecting devices include: a first disconnecting device, a second disconnecting device, a third disconnecting device, and a fourth disconnecting device;

[0087] The first disconnecting device is connected to the DC bus at one end and to the first bidirectional DC conversion module at the other end.

[0088] The second disconnecting device is connected at one end to the first bidirectional DC-DC converter module and at the other end to the energy storage system;

[0089] The third disconnecting device is connected at one end to the connection point of the second disconnecting device and the first bidirectional DC-DC conversion module, and at the other end to the photovoltaic system.

[0090] The fourth disconnecting device is connected at one end to the connection point of the second disconnecting device and the energy storage system, and at the other end to the connection point of the first disconnecting device and the first bidirectional DC-DC conversion module.

[0091] In some embodiments, when the fourth disconnecting device and the third disconnecting device are disconnected, and the second disconnecting device and the first disconnecting device are closed, the energy storage system is connected to the DC bus through the first bidirectional DC-DC conversion module.

[0092] When the fourth disconnecting device and the second disconnecting device are disconnected, and the third disconnecting device and the first disconnecting device are closed, the photovoltaic system is connected to the DC bus through the first bidirectional DC conversion module.

[0093] When the second disconnecting device and the first disconnecting device are disconnected, and the fourth disconnecting device and the third disconnecting device are closed, the photovoltaic system is connected to the energy storage system through the first bidirectional DC-DC conversion module.

[0094] In some embodiments, when the first disconnecting device and the fourth disconnecting device are closed, and the second disconnecting device and the third disconnecting device are open, the energy storage system is connected to the DC bus; the energy storage system is used to supply power to the AC power system through the DC bus and the AC-DC conversion module.

[0095] In some embodiments, the method further includes:

[0096] The energy storage system is powered by an AC power system, an AC-DC conversion module, a DC bus, and a second bidirectional DC conversion module.

[0097] Alternatively, the charging terminal can be powered by an energy storage system, a second bidirectional DC-DC converter module, a DC bus, and a unidirectional DC-DC converter module.

[0098] In some embodiments, the method further includes:

[0099] Power is supplied to the charging terminal through an AC power system, an AC-DC conversion module, a DC bus, and a unidirectional DC conversion module.

[0100] In some embodiments, the method further includes:

[0101] When the power demand of the charging terminal is greater than or equal to the power threshold, power is supplied to the charging terminal through the AC power system, AC-DC conversion module, DC bus and unidirectional DC conversion module; power is supplied to the charging terminal through the energy storage system, second bidirectional DC conversion module, DC bus and unidirectional DC conversion module; power is supplied to the charging terminal through the photovoltaic system, first bidirectional DC conversion module, DC bus and unidirectional DC conversion module.

[0102] Alternatively, when the power demand of the charging terminal is greater than or equal to the power threshold, power is supplied to the charging terminal through the AC power system, AC-DC conversion module, DC bus and unidirectional DC conversion module; power is supplied to the charging terminal through the energy storage system, first bidirectional DC conversion module, DC bus and unidirectional DC conversion module.

[0103] In some embodiments, the method further includes:

[0104] When the power demand of the charging terminal is greater than zero and less than the power threshold, power is supplied to the charging terminal through the AC power system, AC-DC conversion module, DC bus and unidirectional DC conversion module;

[0105] Alternatively, the charging terminal can be powered by an energy storage system, a second bidirectional DC-DC converter module, a DC bus, and a unidirectional DC-DC converter module.

[0106] Alternatively, the charging terminal can be powered by an energy storage system, a first bidirectional DC-DC converter module, a DC bus, and a unidirectional DC-DC converter module.

[0107] Alternatively, the charging terminal can be powered by a photovoltaic system, a first bidirectional DC-DC converter module, a DC bus, and a unidirectional DC-DC converter module.

[0108] In some embodiments, the method further includes:

[0109] When the charging terminal's power demand is zero, power is supplied to the energy storage system through the AC power system, AC-DC conversion module, DC bus, and second bidirectional DC conversion module.

[0110] Alternatively, the energy storage system can be powered by an AC power system, an AC-DC conversion module, a DC bus, a first bidirectional DC conversion module, and a second bidirectional DC conversion module.

[0111] Alternatively, power can be supplied to the AC power system through energy storage systems, DC buses, and AC-DC conversion modules;

[0112] Alternatively, power can be supplied to the AC power system through a photovoltaic system, a first bidirectional DC-DC conversion module, a DC bus, and an AC-DC conversion module;

[0113] Alternatively, the energy storage system can be powered by a photovoltaic system and a first bidirectional DC-DC converter module.

[0114] In some embodiments, the DC bus includes a first DC bus and a second DC bus;

[0115] A portion of the AC-DC conversion module, a portion of the bidirectional DC conversion module, and a portion of the unidirectional DC conversion module are connected to the first DC bus; another portion of the AC-DC conversion module, another portion of the bidirectional DC conversion module, and another portion of the unidirectional DC conversion module are connected to the second DC bus.

[0116] In some embodiments, the charging system further includes: a fifth disconnection device;

[0117] One end of the fifth disconnecting device is connected to the first DC bus, and the other end is connected to the second DC bus.

[0118] In some embodiments, the charging system further includes: a power distribution module;

[0119] The power distribution module connects the unidirectional DC-DC converter module and the charging terminal, and is used to distribute the DC power output by the unidirectional DC-DC converter module to the charging terminal.

[0120] Thirdly, this application discloses an electronic device including: a processor, a memory, and a computer program stored in the memory and capable of running on the processor, wherein the computer program, when executed by the processor, implements a charging system control method of the second aspect.

[0121] Fourthly, this application discloses a computer-readable storage medium including a computer program that, when run on a computer, causes the computer to perform the charging system control method of the second aspect.

[0122] Fifthly, some embodiments of this application provide a charging system, including:

[0123] DC source;

[0124] A DC bus is used to transmit DC power converted from AC power grid power, or to transmit DC power output from a DC source.

[0125] The charging host is used to output charging current to external devices;

[0126] A DC transformer is used to transform DC power transmitted from a DC bus and / or DC power output from a DC source; and

[0127] The switching device has a first switching state and a second switching state;

[0128] In the first switching state, the DC source is electrically connected to the DC bus through the switching device to enable power transmission between the DC bus and the DC source; in the second switching state, the DC source is electrically connected to the charging host through the switching device to enable power transmission between the DC source and the charging host.

[0129] In some embodiments of this application, the DC source is connected to the same DC transformer in both the first switching state and the second switching state.

[0130] In some embodiments of this application, the DC transformer includes:

[0131] The first type of DC transformer is electrically connected to the DC bus and the charging host; and

[0132] The second type of DC transformer is electrically connected to the DC bus, the charging host and the DC source;

[0133] In both the first and second switching states, the DC source is connected to a second type of DC transformer.

[0134] In some embodiments of this application, the switching device includes:

[0135] The first type of switching device is used to control the connection between the second type of DC transformer and the charging host;

[0136] The second type of switching device is used to control the connection between the second type of DC transformer and the DC bus.

[0137] In some embodiments of this application, the on / off states of the first type of switching device and the second type of switching device are different in the first switching state and the second switching state.

[0138] In some embodiments of this application, the charging system further includes:

[0139] A current converter is used to convert electrical energy from the AC power grid into DC power and output it to the DC bus.

[0140] In some embodiments of this application, the DC bus includes:

[0141] The first DC bus and the second DC bus are electrically connected to a portion of the current converters, and the first DC bus and the second DC bus are connected to a portion of the DC transformers.

[0142] In some embodiments of this application, the charging system further includes:

[0143] The first type of disconnection device is used to enable the DC bus to have a first power supply state and a second power supply state;

[0144] In the first power supply state, power transmission between the DC transformer and a portion of the DC transformers is achieved through the first DC bus, and power transmission between the DC transformer and another portion of the DC transformers is achieved through the second DC bus.

[0145] In the second power supply state, power transmission between all DC transformers is achieved through the first DC bus and the second DC bus.

[0146] In some embodiments of this application, the connection lines between the DC transformer and the DC bus include:

[0147] The first type of connection line is electrically connected to the first DC bus;

[0148] The second type of connection line is electrically connected to the second DC bus;

[0149] The first connection end of the first type of disconnecting device is connected to the first type of connection line, and the second connection end is connected to the second type of connection line.

[0150] In some embodiments of this application, each first type of connection line is connected to only one first type of disconnecting device, and each second connection line is also connected to only one first type of disconnecting device.

[0151] In some embodiments of this application, the charging system further includes:

[0152] The second type of disconnection device is used to control the connection between the DC transformer and the first DC bus.

[0153] In some embodiments of this application, the charging system further includes:

[0154] The third type of disconnection device is used to control the connection between the DC transformer and the second DC bus.

[0155] In some embodiments of this application, the second type of disconnecting device is disposed on the connection line between the first connection terminal of the first type of disconnecting device and the first DC bus.

[0156] The third type of disconnecting device is installed on the connection line between the second connection terminal of the first type of disconnecting device and the second DC bus.

[0157] In some embodiments of this application, the charging system further includes:

[0158] The power divider is electrically connected to the DC transformer and the charging host to distribute the DC power, which has been transformed by the DC transformer, to the charging host.

[0159] Sixthly, some embodiments of this application provide a control method for a charging system, including:

[0160] The control switching device is switched to the first switching state so that the DC bus can transmit electrical energy to the DC source through the DC transformer;

[0161] The control switching device is switched to the second switching state so that the DC source can transmit electrical energy to the charging host through the DC transformer.

[0162] In some embodiments of this application, the first type of disconnecting device is controlled to be in the disconnected state, so that the DC bus is in the first power supply state, thereby realizing the power transmission between the first DC bus and part of the DC transformer and the power transmission between the second DC bus and another part of the DC transformer.

[0163] By controlling the first type of disconnecting device to be in the closed state, the DC bus is put into the second power supply state, so that the first DC bus and the second DC bus can jointly transmit electrical energy to all DC transformers.

[0164] In some embodiments of this application, the second type of disconnecting device is controlled to be in a closed state, while the first type of disconnecting device and the third type of disconnecting device are in a disconnected state, thereby realizing the power transmission between the first DC bus and part of the DC transformer, and realizing the interruption of the power transmission between the second DC bus and another part of the DC transformer.

[0165] The third type of disconnecting device is controlled to be in the closed state, while the first type of disconnecting device and the second type of disconnecting device are in the open state, so as to realize the power transmission between the second DC bus and part of the DC transformer, and to realize the interruption of the power transmission between the first DC bus and another part of the DC transformer.

[0166] In some embodiments of this application, the second type of disconnecting device is controlled to be in an open state, while the first type of disconnecting device and the third type of disconnecting device are in a closed state, so that the second DC bus can transmit power to all DC transformers independently.

[0167] The third type of disconnect device is controlled to be in the open state, while the first type of disconnect device and the second type of disconnect device are in the closed state, so that the first DC bus can transmit electrical energy to all DC transformers independently.

[0168] The embodiments of this application have the following advantages:

[0169] The charging system provided in the first aspect of this application includes: a DC bus, a bidirectional DC-DC conversion module, and at least two DC source systems; the bidirectional DC-DC conversion module, when switched to connect the DC bus and a DC source system, is used to convert the DC power from one DC source system and output the converted DC power to the DC bus; or, to convert the DC power from the DC bus and output the converted DC power to a DC source system; when switched to connect between one DC source system and another DC source system, it is used to convert the DC power from one DC source system and output the converted DC power to the other DC source system, thereby enabling the bidirectional DC-DC conversion module to be reused, improving the utilization rate of each module, and reducing the number of modules in the system architecture.

[0170] The fifth and sixth aspects of this application provide a charging system and its control method that can improve energy conversion efficiency by enabling power transfer between a DC bus and a DC source, or between a DC source and a charging host, through a switching device. The use of a DC transformer allows for voltage conversion of the DC power obtained from the DC bus before outputting it to the charging host, and subsequently to the load. It also allows for voltage conversion of the DC power obtained from the DC bus before outputting it to other DC sources, reducing the number of components in the charging system, simplifying the system circuitry, and improving system stability. The switching device enables the DC transformer to simultaneously transmit DC power from the DC source and the DC bus to the charging host, increasing charging power.

[0171] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0172] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0173] Figure 1 is a structural block diagram of a charging system according to some embodiments of this application;

[0174] Figure 2 is a structural block diagram of another charging system according to some embodiments of this application;

[0175] Figure 3 is a structural block diagram of another charging system according to some embodiments of this application;

[0176] Figure 4 is a schematic diagram of the working principle of the charging system in some embodiments of this application;

[0177] Figure 5 is a schematic diagram of the working principle of a DC transformer in some embodiments of this application;

[0178] Figure 6 is a schematic diagram of the structure of a charging system in some embodiments of this application;

[0179] Figure 7 is a schematic diagram of another charging system in some embodiments of this application;

[0180] Figure 8 is a schematic diagram of the structure of another charging system in some embodiments of this application.

[0181] Explanation of reference numerals in the attached drawings: Charging system 10, DC bus 11, bidirectional DC-DC converter module 12, DC power source system 13, AC-DC converter module 14, unidirectional DC-DC converter module 15, charging terminal 16, AC power system 17, charging host 18, energy storage system 19, photovoltaic system 20, first bidirectional DC-DC converter module 21, second bidirectional DC-DC converter module 22, power distribution module 23, first DC bus 24, second DC bus 25, first disconnecting device S1, second disconnecting device S2, third disconnecting device S3, fourth disconnecting device S4, fifth disconnecting device S5; 100. AC power grid; 200. DC power source; 300. DC bus; 310. First DC bus; 320. Second DC bus; 400. Charging host; 500. DC transformer; 510. First type DC transformer; 520. Second type DC transformer; 600. Switching device; 610. First type switching device; 620. Second type switching device; 700. Current converter; 800. Disconnecting device; 810. First type disconnecting device; 820. Second type disconnecting device; 830. Third type disconnecting device; 900. Power distributor. Detailed Implementation

[0182] Firstly, this application proposes a charging system aimed at improving the utilization rate of DC-DC modules. To achieve this goal, the charging system in some embodiments of this application can connect a bidirectional DC-DC converter module (bidirectional DC-DC module) to a DC bus and a DC source system, or switch to connecting one DC source system and another DC source system, thereby enabling the bidirectional DC-DC converter module to be reused, improving the utilization rate of each module, and reducing the number of modules in the system architecture.

[0183] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0184] Referring to FIG1, a structural block diagram of a charging system according to some embodiments of the present application is shown. The charging system 10 may specifically include: a DC bus 11, a bidirectional DC-DC conversion module 12, and at least two DC source systems 13.

[0185] The bidirectional DC-DC converter module 12, when switched to connect a DC bus 11 and a DC source system 13, is used to convert the DC power from the DC source system 13 and output the converted DC power to the DC bus 11; or, it converts the DC power from the DC bus 11 and outputs the converted DC power to the DC source system 13; when switched to connect a DC source system 13 and another DC source system 13, it is used to convert the DC power from the DC source system 13 and output the converted DC power to the other DC source system 13.

[0186] In some embodiments of this application, the charging system may include: a DC bus, a bidirectional DC-DC converter module, and at least two DC source systems; the bidirectional DC-DC converter module, when switching to connect the DC bus and a DC source system, is used to convert the DC power from one DC source system and output the converted DC power to the DC bus; or, it converts the DC power from the DC bus and outputs the converted DC power to a DC source system; when switching to connect between one DC source system and another DC source system, it is used to convert the DC power from one DC source system and output the converted DC power to the other DC source system, thereby enabling the bidirectional DC-DC converter module to be reused, improving the utilization rate of each module, and reducing the number of modules in the system architecture.

[0187] In some embodiments, the charging system 10 further includes: an AC-DC conversion module 14, a unidirectional DC conversion module 15, and a charging terminal 16;

[0188] AC-DC conversion module 14 connects DC bus 11 and AC power system 17, and is used to convert AC power from AC power system 17 into DC power and output it to DC bus 11;

[0189] The unidirectional DC-DC converter module 15 is connected to the DC bus 11 and the charging terminal 16. It is used to convert the DC power from the DC bus 11 and output the converted DC power to the charging terminal 16.

[0190] In some embodiments of this application, the DC bus 11, AC-DC conversion module 14, bidirectional DC conversion module 12, and unidirectional DC conversion module 15 can be housed within the charging host 18. The charging host is the core equipment in an electric vehicle (EV) charging station, responsible for converting AC power from the power grid into DC power suitable for charging EV batteries, or directly providing AC power for conversion by the charger inside the EV. It typically has multiple charging interfaces, allowing simultaneous charging of multiple charging terminals. The charging system in some embodiments of this application can reuse the bidirectional DC conversion module, improving the utilization rate of each module and reducing the number of modules in the system architecture; it also rationally allocates the AC-DC conversion module and the DC conversion module, improving the utilization rate of each module and reducing energy loss.

[0191] Referring to FIG2, a structural block diagram of another charging system according to some embodiments of the present application is shown. At least two DC source systems 13 include an energy storage system 19 and a photovoltaic system 20. The bidirectional DC conversion module 12 includes a first bidirectional DC conversion module 21. The first bidirectional DC conversion module 21 is connected to the DC bus 11 and the energy storage system 19 or the DC bus 11 and the photovoltaic system 20; or, the first bidirectional DC conversion module 21 is connected to the energy storage system 19 and the photovoltaic system 20.

[0192] The bidirectional DC-DC converter module 12 also includes a second bidirectional DC-DC converter module 22; the second bidirectional DC-DC converter module 22 is connected to the DC bus 11 and the energy storage system 19;

[0193] The charging system 10 also includes: multiple disconnection devices; multiple disconnection devices for connecting the DC bus, the first bidirectional DC-DC conversion module, the photovoltaic system and the energy storage system; specifically, the multiple disconnection devices are used to connect the DC bus and the first bidirectional DC-DC conversion module, and / or connect the first bidirectional DC-DC conversion module with the photovoltaic system or the first bidirectional DC-DC conversion module with the energy storage system, and / or connect the photovoltaic system with the energy storage system;

[0194] The multiple disconnection devices include: a first disconnection device S1, a second disconnection device S2, a third disconnection device S3, and a fourth disconnection device S4; the first disconnection device S1 is connected at one end to the DC bus 11 and at the other end to the first bidirectional DC-DC converter module 21; the second disconnection device S2 is connected at one end to the first bidirectional DC-DC converter module 21 and at the other end to the energy storage system 19; the third disconnection device S3 is connected at one end to the connection point between the second disconnection device S2 and the first bidirectional DC-DC converter module 21 and at the other end to the photovoltaic system 20; the fourth disconnection device S4 is connected at one end to the connection point between the second disconnection device S2 and the energy storage system 19 and at the other end to the connection point between the first disconnection device S1 and the first bidirectional DC-DC converter module 21.

[0195] The charging host 10 also includes a power distribution module 23; the power distribution module 23 is connected to the unidirectional DC-DC conversion module 15 and the charging terminal 16, and is used to distribute the DC power output by the unidirectional DC-DC conversion module 15 to the charging terminal 16.

[0196] In some embodiments of this application, the DC power source system may include an energy storage system and a photovoltaic system, the bidirectional DC-DC conversion module includes a first bidirectional DC-DC conversion module and a second bidirectional DC-DC conversion module, and the charging system may further include a first disconnecting device, a second disconnecting device, a third disconnecting device, a fourth disconnecting device, and a power distribution module. The power distribution module is a switching matrix circuit that can connect the DC-DC module to the corresponding charging terminal (or connect charging terminals to each other) to achieve energy exchange.

[0197] As shown in Figure 2, when the fourth disconnecting device S4 and the third disconnecting device S3 are disconnected, and the second disconnecting device S2 and the first disconnecting device S1 are closed, the first bidirectional DC-DC converter module 21 connects the DC bus 11 and the energy storage system 19; when the fourth disconnecting device S4 and the second disconnecting device S2 are disconnected, and the third disconnecting device S3 and the first disconnecting device S1 are closed, the first bidirectional DC-DC converter module 21 connects the DC bus 11 and the photovoltaic system 20; when the second disconnecting device S2 and the first disconnecting device S1 are disconnected, and the fourth disconnecting device S4 and the third disconnecting device S3 are closed, the first bidirectional DC-DC converter module 21 connects the energy storage system 19 and the photovoltaic system 20. The charging system of some embodiments of this application can achieve the following operating conditions:

[0198] (1) The AC power system rectifies the AC power and outputs it to the DC bus through the AC-DC module (AC-DC conversion module), and then supplies power to the charging terminal through the unidirectional DC-DC module (unidirectional DC conversion module) and the power distribution module.

[0199] (2) The AC power system rectifies the AC power through the AC-DC module and outputs it to the DC bus. The DC bus supplies power to the energy storage system through the second bidirectional DC-DC module (second bidirectional DC conversion module).

[0200] (3) The AC power system rectifies the AC power and outputs it to the DC bus through the AC-DC module, and supplies power to the energy storage system through the first bidirectional DC-DC module (first bidirectional DC conversion module) and / or the second bidirectional DC-DC module;

[0201] (4) The energy storage system supplies power to the charging terminal through the second bidirectional DC-DC module, DC bus, unidirectional DC-DC module and power distribution module;

[0202] (5) The energy storage system supplies power to the charging terminal through the first bidirectional DC-DC module and / or the second bidirectional DC-DC module, the DC bus, the unidirectional DC-DC module and the power distribution module;

[0203] (6) The energy storage system is directly connected to the DC bus and discharges to the AC power system;

[0204] (7) The photovoltaic system supplies power to the charging terminal through the first bidirectional DC-DC module, DC bus, unidirectional DC-DC module and power distribution module;

[0205] (8) The photovoltaic system discharges to the AC power system through the first bidirectional DC-DC module and the DC bus;

[0206] (9) The photovoltaic system supplies power to the energy storage system through the first bidirectional DC-DC module.

[0207] The charging system of some embodiments of this application can realize the interaction between AC power system, energy storage system, photovoltaic system and charging terminal. At the same time, it reuses the first bidirectional DC-DC module, reducing the number of modules in the charging system architecture, and the connection method is simple, reducing design costs. The energy storage system can also directly discharge to AC power system, reducing the number of path modules and improving the energy conversion efficiency.

[0208] In some embodiments, when the fourth disconnecting device S4 and the third disconnecting device S3 are disconnected, and the second disconnecting device S2 and the first disconnecting device S1 are closed, the first bidirectional DC-DC converter module 21 connects the DC bus 11 and the energy storage system 19.

[0209] When the first bidirectional DC-DC converter module connects the energy storage system to the DC bus, the AC power system is used to supply power to the energy storage system; specifically, the AC power system is used to supply power to the energy storage system through the AC-DC converter module, the DC bus, and the first bidirectional DC-DC converter module.

[0210] Alternatively, when the first bidirectional DC-DC converter module is connected to the energy storage system and the DC bus, the energy storage system is used to supply power to the charging terminal; specifically, the energy storage system is used to supply power to the charging terminal through the first bidirectional DC-DC converter module, the DC bus, and the unidirectional DC-DC converter module.

[0211] In some embodiments of this application, the first bidirectional DC-DC converter module can be connected to the charging system by controlling the closing and opening of the disconnecting device to perform the following operating conditions: When S2 and S1 are closed and S4 and S3 are open, the energy storage system is connected to the DC bus through the first bidirectional DC-DC converter module. At this time, operating condition (3) can be performed, that is, the AC power system supplies power to the energy storage system through the AC-DC converter module, the DC bus and the first bidirectional DC-DC converter module. Operating condition (5) can also be performed at this time, that is, the energy storage system supplies power to the charging terminal through the first bidirectional DC-DC converter module, the DC bus and the unidirectional DC-DC converter module.

[0212] In some embodiments, when the fourth disconnecting device S4 and the second disconnecting device S2 are disconnected, and the third disconnecting device S3 and the first disconnecting device S1 are closed, the first bidirectional DC-DC converter module 21 connects the DC bus 11 and the photovoltaic system 20.

[0213] When the first bidirectional DC-DC converter module connects the photovoltaic system to the DC bus, the photovoltaic system is used to supply power to the charging terminal; specifically, the photovoltaic system is used to supply power to the charging terminal through the first bidirectional DC-DC converter module, the DC bus, and the unidirectional DC-DC converter module.

[0214] When the first bidirectional DC-DC converter module connects the photovoltaic system to the DC bus, the photovoltaic system is also used to supply power to the AC power system; specifically, the photovoltaic system is used to supply power to the AC power system through the first bidirectional DC-DC converter module, the DC bus, and the AC-DC converter module.

[0215] In some embodiments of this application, when S3 and S1 are closed and S4 and S2 are open, the photovoltaic system is connected to the DC bus through the first bidirectional DC-DC conversion module. At this time, operating condition (7) can be executed, that is, the photovoltaic system supplies power to the charging terminal through the first bidirectional DC-DC conversion module, the DC bus, and the unidirectional DC-DC conversion module. Operating condition (8) can also be executed at this time, that is, the photovoltaic system supplies power to the AC power system through the first bidirectional DC-DC conversion module, the DC bus, and the AC-DC conversion module.

[0216] In some embodiments, when the second disconnecting device S2 and the first disconnecting device S1 are disconnected, and the fourth disconnecting device S4 and the third disconnecting device S3 are closed, the first bidirectional DC-DC converter 21 connects the energy storage system 19 and the photovoltaic system 20.

[0217] When the first bidirectional DC-DC converter module connects the photovoltaic system and the energy storage system, the photovoltaic system is used to supply power to the energy storage system; specifically, the photovoltaic system is used to supply power to the energy storage system through the first bidirectional DC-DC converter module.

[0218] In some embodiments of this application, when S4 and S3 are closed and S2 and S1 are open, the photovoltaic system is connected to the energy storage system through the first bidirectional DC-DC converter module. At this time, operating condition (9) can be executed, that is, the photovoltaic system supplies power to the energy storage system through the first bidirectional DC-DC converter module.

[0219] In some embodiments, when the first disconnecting device and the fourth disconnecting device are closed, and the second disconnecting device and the third disconnecting device are open, the energy storage system is connected to the DC bus; the energy storage system is used to supply power to the AC power system through the DC bus and the AC-DC conversion module.

[0220] In some embodiments of this application, when S1 and S4 are closed and S2 and S3 are open, the energy storage system is directly connected to the DC bus. At this time, operating condition (6) can be executed, that is, the energy storage system supplies power to the AC power system through the DC bus and the AC-DC conversion module. The electrical energy of the energy storage system does not pass through the bidirectional DC conversion module and is directly discharged to the AC power system, which can reduce the number of modules in the power path and improve the power conversion efficiency.

[0221] In some embodiments, the AC power system is also used to supply power to the energy storage system through an AC-DC conversion module, a DC bus, and a second bidirectional DC conversion module;

[0222] Alternatively, the energy storage system can also be used to power the charging terminal through a second bidirectional DC-DC converter module, a DC bus, and a unidirectional DC-DC converter module.

[0223] In some embodiments of this application, the second bidirectional DC-DC converter module is always connected to the energy storage system and the DC bus. Operating condition (2) can be performed through the second bidirectional DC-DC converter module, i.e., the AC power system supplies power to the energy storage system through the AC-DC converter module, the DC bus, and the second bidirectional DC-DC converter module. Operating condition (4) can also be performed through the second bidirectional DC-DC converter module, i.e., the energy storage system supplies power to the charging terminal through the second bidirectional DC-DC converter module, the DC bus, and the unidirectional DC-DC converter module.

[0224] In some embodiments, the AC power system is further configured to supply power to the charging terminal via an AC-DC conversion module, a DC bus, and a unidirectional DC conversion module; and / or,

[0225] The AC power system is also used to supply power to the energy storage system through AC-DC conversion modules, DC buses, and a second bidirectional DC conversion module.

[0226] In some embodiments of this application, the AC power system can perform operating condition (1) through an AC-DC conversion module, a DC bus, and a unidirectional DC conversion module to supply power to the charging terminal. The AC power system can also perform operating condition (2) through an AC-DC conversion module, a DC bus, and a second bidirectional DC conversion module to supply power to the energy storage system. Operating conditions (1) and (2) can be performed simultaneously.

[0227] In some embodiments, when the power demand of the charging terminal is greater than or equal to a power threshold, the AC power system supplies power to the charging terminal through the AC-DC conversion module, the DC bus, and the unidirectional DC conversion module; the energy storage system supplies power to the charging terminal through the second bidirectional DC conversion module, the DC bus, and the unidirectional DC conversion module; the photovoltaic system is connected to the DC bus through the first bidirectional DC conversion module, and the photovoltaic system supplies power to the charging terminal through the first bidirectional DC conversion module, the DC bus, and the unidirectional DC conversion module.

[0228] Alternatively, when the power demand of the charging terminal is greater than or equal to the power threshold, the AC power system supplies power to the charging terminal through the AC-DC conversion module, the DC bus, and the unidirectional DC conversion module; when the energy storage system is connected to the DC bus through the first bidirectional DC conversion module, the energy storage system supplies power to the charging terminal through the first bidirectional DC conversion module, the DC bus, and the unidirectional DC conversion module.

[0229] In some embodiments of this application, when the power demand of the charging terminal is greater than or equal to a power threshold, a high-power charging condition can be selected. For example, conditions (1), (4), and (7) can be executed simultaneously, allowing the AC power system, energy storage system, and photovoltaic system to supply power to the charging terminal at the same time. Alternatively, conditions (1) and (5) can also be executed simultaneously, allowing the AC power system and energy storage system to supply power to the charging terminal at the same time. By selecting a high-power charging condition based on the high power demand of the charging terminal, charging efficiency can be improved. For example, the power threshold of the charging pile for electric vehicles can be 15 kilowatts. Those skilled in the art can set the power threshold of other charging devices to other appropriate values ​​based on the ideas of this application, and this application does not impose any limitations on this.

[0230] In one embodiment, when the power demand of the charging terminal is greater than zero and less than the power threshold, the AC power system is used to supply power to the charging terminal through the AC-DC conversion module, the DC bus and the unidirectional DC conversion module;

[0231] Alternatively, the energy storage system can be used to power the charging terminal through a second bidirectional DC-DC converter module, a DC bus, and a unidirectional DC-DC converter module;

[0232] Alternatively, when the energy storage system is connected to the DC bus through the first bidirectional DC-DC conversion module, the energy storage system is used to supply power to the charging terminal through the first bidirectional DC-DC conversion module, the DC bus, and the unidirectional DC-DC conversion module.

[0233] Alternatively, the photovoltaic system can be connected to the DC bus via a first bidirectional DC-DC conversion module, and the photovoltaic system can supply power to the charging terminal through the first bidirectional DC-DC conversion module, the DC bus, and the unidirectional DC-DC conversion module.

[0234] In some embodiments of this application, when the power demand of the charging terminal is greater than zero and less than the power threshold, a medium-power charging condition can be selected, for example, operating condition (1), (4), (5), or (7) can be executed, so that one of the AC power system, energy storage system, or photovoltaic system supplies power to the charging terminal. By selecting an appropriate operating condition based on the power demand of the charging terminal, energy loss can be reduced.

[0235] In some embodiments, when the power demand of the charging terminal is zero, the AC power system is used to supply power to the energy storage system through the AC-DC conversion module, the DC bus, and the second bidirectional DC conversion module;

[0236] Alternatively, the AC power system is used to supply power to the energy storage system through the AC-DC conversion module, the DC bus, the first bidirectional DC conversion module and the second bidirectional DC conversion module;

[0237] Alternatively, the energy storage system can be used to supply power to the AC power system via a DC bus and an AC-DC conversion module;

[0238] Alternatively, the photovoltaic system is used to supply power to the AC power system through a first bidirectional DC-DC conversion module, a DC bus, and an AC-DC conversion module;

[0239] Alternatively, the photovoltaic system can be used to power the energy storage system via a first bidirectional DC-DC converter module.

[0240] In some embodiments of this application, when the charging terminal's power demand is zero, a low-power charging condition or no power supply to the charging terminal can be selected. For example, condition (2) is executed to allow the AC power system to supply power to the energy storage system, or condition (3) is executed to allow the AC power system to supply power to the energy storage system, or condition (6) is executed to allow the energy storage system to discharge to the AC power system, or condition (8) is executed to allow the photovoltaic system to discharge to the AC power system, or condition (9) is executed to allow the photovoltaic system to supply power to the energy storage system. By selecting a low-power charging condition or no power supply to the charging terminal based on the low power demand of the charging terminal, energy loss can be reduced.

[0241] Referring to FIG3, a structural block diagram of another charging system according to some embodiments of the present application is shown, wherein the DC bus 11 includes a first DC bus 24 and a second DC bus 25;

[0242] A portion of the AC-DC conversion module 14, a portion of the bidirectional DC conversion module 12, and a portion of the unidirectional DC conversion module 15 are connected to the first DC bus 24; another portion of the AC-DC conversion module 14, another portion of the bidirectional DC conversion module 12, and another portion of the unidirectional DC conversion module 15 are connected to the second DC bus 25.

[0243] In some embodiments, the charging system 10 further includes a fifth disconnection device S5;

[0244] One end of the fifth disconnecting device S5 is connected to the first DC bus 24, and the other end is connected to the second DC bus 25;

[0245] When the AC-DC conversion module 14, the bidirectional DC conversion module 12, or the unidirectional DC conversion module 15 malfunctions, the fifth disconnect device S5 closes to connect the first DC bus 24 and the second DC bus 25.

[0246] In some embodiments of this application, the DC bus may include a first DC bus and a second DC bus. A portion of each of the AC-DC conversion module, bidirectional DC conversion module, and unidirectional DC conversion module is connected to the first DC bus, and another portion is connected to the second DC bus. Exemplarily, under normal operating conditions, the first and second DC buses can each allocate half of the AC-DC conversion module, bidirectional DC conversion module, and unidirectional DC conversion module, thereby reducing the current flowing through a single DC bus. When a conversion module malfunctions or requires maintenance, the malfunctioning module can be disconnected from the circuit, and S5 can be closed to connect the first and second DC buses, thereby improving the operational stability of the charging system.

[0247] The charging system proposed in the first aspect of this application can reuse bidirectional DC-DC conversion modules, improving the utilization rate of each module and reducing the number of modules in the system architecture. The rational allocation of AC-DC conversion modules and DC-DC conversion modules enables interaction between the AC power system, energy storage system, photovoltaic system, and charging terminal, reducing energy loss. Direct discharge from the energy storage system to the AC power system reduces the number of intermediate modules and improves energy conversion efficiency. The charging system can also execute multiple charging conditions and select the appropriate condition based on the power demand of the charging terminal to improve charging efficiency and reduce energy loss. Furthermore, the dual DC bus structure enhances the operational stability of the charging system.

[0248] Secondly, some embodiments of this application also provide a charging system control method, applied to the charging system of the first aspect, the method comprising:

[0249] Switching a DC power source system to be connected to a DC bus via a bidirectional DC-DC conversion module and controlling a DC power source system to supply power to an AC power system, or controlling an AC power system to supply power to a DC power source system;

[0250] Alternatively, one DC power source system can be switched to connect with another DC power source system via a bidirectional DC-DC converter module, and one DC power source system can be controlled to supply power to the other DC power source system.

[0251] In some embodiments of this application, the method further includes:

[0252] The AC power from the AC power system is converted into DC power through an AC-DC conversion module and then output to the DC bus.

[0253] In some embodiments of this application, the method further includes:

[0254] The DC power from the DC bus is converted by a unidirectional DC-DC converter module, and the converted DC power is output to the charging terminal.

[0255] In some embodiments of this application, at least two DC source systems include an energy storage system and a photovoltaic system, and the bidirectional DC conversion module includes a first bidirectional DC conversion module; the first bidirectional DC conversion module is connected to the DC bus and the energy storage system or the DC bus and the photovoltaic system; or, the first bidirectional DC conversion module is connected to the energy storage system and the photovoltaic system.

[0256] In some embodiments of this application, switching a DC power source system to be connected to a DC bus via a bidirectional DC-DC converter module and controlling the DC power source system to supply power to an AC power system, or controlling the AC power system to supply power to a DC power source system, includes:

[0257] When the first bidirectional DC-DC converter module connects the energy storage system to the DC bus, it supplies power to the energy storage system through the AC power system.

[0258] When the first bidirectional DC-DC conversion module is connected to the photovoltaic system and the DC bus, it supplies power to the AC power system through the photovoltaic system.

[0259] Switching one DC power source system to connect with another DC power source system via a bidirectional DC-DC converter module, and controlling one DC power source system to supply power to the other DC power source system, includes:

[0260] When the first bidirectional DC-DC converter module connects the photovoltaic system and the energy storage system, it supplies power to the energy storage system through the photovoltaic system.

[0261] The DC power from the DC bus is converted using a unidirectional DC-DC converter module, and the converted DC power is output to the charging terminal, including:

[0262] When the first bidirectional DC-DC conversion module is connected to the photovoltaic system and the DC bus, the photovoltaic system supplies power to the charging terminal.

[0263] When the first bidirectional DC-DC converter module is connected to the energy storage system and the DC bus, it supplies power to the charging terminal through the energy storage system.

[0264] In some embodiments of this application, when the first bidirectional DC-DC conversion module connects the energy storage system to the DC bus, it supplies power to the energy storage system through the AC power system, including:

[0265] When the first bidirectional DC-DC converter module connects the energy storage system to the DC bus, it supplies power to the energy storage system through the AC power system, the AC-DC converter module, the DC bus, and the first bidirectional DC-DC converter module.

[0266] When the first bidirectional DC-DC conversion module is connected to the photovoltaic system and the DC bus, it supplies power to the AC power system through the photovoltaic system, including:

[0267] When the first bidirectional DC-DC converter module is connected to the photovoltaic system and the DC bus, it supplies power to the AC power system through the photovoltaic system, the first bidirectional DC-DC converter module, the DC bus, and the AC-DC converter module.

[0268] When the first bidirectional DC-DC converter module connects the photovoltaic system and the energy storage system, the photovoltaic system is used to supply power to the energy storage system, including:

[0269] When the first bidirectional DC-DC converter module connects the photovoltaic system and the energy storage system, it supplies power to the energy storage system through the photovoltaic system and the first bidirectional DC-DC converter module.

[0270] When the first bidirectional DC-DC conversion module connects the photovoltaic system to the DC bus, the photovoltaic system is used to supply power to the charging terminal, including:

[0271] When the first bidirectional DC-DC converter module connects the photovoltaic system and the DC bus, the charging terminal is powered through the photovoltaic system, the first bidirectional DC-DC converter module, the DC bus, and the unidirectional DC-DC converter module.

[0272] When the first bidirectional DC-DC converter module is connected to the energy storage system and the DC bus, the energy storage system is used to supply power to the charging terminal, including:

[0273] When the first bidirectional DC-DC converter module is connected to the energy storage system and the DC bus, it supplies power to the charging terminal through the energy storage system, the first bidirectional DC-DC converter module, the DC bus, and the unidirectional DC-DC converter module.

[0274] In some embodiments of this application, the charging system further includes: a plurality of disconnection devices;

[0275] Multiple disconnection devices are used to connect the DC bus, the first bidirectional DC-DC conversion module, the photovoltaic system, and the energy storage system.

[0276] In some embodiments of this application, multiple disconnection devices are used to connect the DC bus and the first bidirectional DC-DC converter module, and / or connect the first bidirectional DC-DC converter module with the photovoltaic system or the first bidirectional DC-DC converter module with the energy storage system, and / or connect the photovoltaic system with the energy storage system.

[0277] In some embodiments of this application, the multiple disconnection devices include: a first disconnection device, a second disconnection device, a third disconnection device, and a fourth disconnection device;

[0278] The first disconnecting device is connected to the DC bus at one end and to the first bidirectional DC conversion module at the other end.

[0279] The second disconnecting device is connected at one end to the first bidirectional DC-DC converter module and at the other end to the energy storage system;

[0280] The third disconnecting device is connected at one end to the connection point of the second disconnecting device and the first bidirectional DC-DC conversion module, and at the other end to the photovoltaic system.

[0281] The fourth disconnecting device is connected at one end to the connection point of the second disconnecting device and the energy storage system, and at the other end to the connection point of the first disconnecting device and the first bidirectional DC-DC conversion module.

[0282] In some embodiments of this application, when the fourth disconnecting device and the third disconnecting device are disconnected, and the second disconnecting device and the first disconnecting device are closed, the energy storage system is connected to the DC bus through the first bidirectional DC-DC conversion module.

[0283] When the fourth disconnecting device and the second disconnecting device are disconnected, and the third disconnecting device and the first disconnecting device are closed, the photovoltaic system is connected to the DC bus through the first bidirectional DC conversion module.

[0284] When the second disconnecting device and the first disconnecting device are disconnected, and the fourth disconnecting device and the third disconnecting device are closed, the photovoltaic system is connected to the energy storage system through the first bidirectional DC-DC conversion module.

[0285] In some embodiments of this application, when the first disconnecting device and the fourth disconnecting device are closed, and the second disconnecting device and the third disconnecting device are open, the energy storage system is connected to the DC bus; the energy storage system is used to supply power to the AC power system through the DC bus and the AC-DC conversion module.

[0286] In some embodiments of this application, the method further includes:

[0287] The energy storage system is powered by an AC power system, an AC-DC conversion module, a DC bus, and a second bidirectional DC conversion module.

[0288] Alternatively, the charging terminal can be powered by an energy storage system, a second bidirectional DC-DC converter module, a DC bus, and a unidirectional DC-DC converter module.

[0289] In some embodiments of this application, the method further includes:

[0290] Power is supplied to the charging terminal through an AC power system, an AC-DC conversion module, a DC bus, and a unidirectional DC conversion module.

[0291] In some embodiments of this application, the method further includes:

[0292] When the power demand of the charging terminal is greater than or equal to the power threshold, power is supplied to the charging terminal through the AC power system, AC-DC conversion module, DC bus and unidirectional DC conversion module; power is supplied to the charging terminal through the energy storage system, second bidirectional DC conversion module, DC bus and unidirectional DC conversion module; power is supplied to the charging terminal through the photovoltaic system, first bidirectional DC conversion module, DC bus and unidirectional DC conversion module.

[0293] Alternatively, when the power demand of the charging terminal is greater than or equal to the power threshold, power is supplied to the charging terminal through the AC power system, AC-DC conversion module, DC bus and unidirectional DC conversion module; power is supplied to the charging terminal through the energy storage system, first bidirectional DC conversion module, DC bus and unidirectional DC conversion module.

[0294] In some embodiments of this application, the method further includes:

[0295] When the power demand of the charging terminal is greater than zero and less than the power threshold, power is supplied to the charging terminal through the AC power system, AC-DC conversion module, DC bus and unidirectional DC conversion module;

[0296] Alternatively, the charging terminal can be powered by an energy storage system, a second bidirectional DC-DC converter module, a DC bus, and a unidirectional DC-DC converter module.

[0297] Alternatively, the charging terminal can be powered by an energy storage system, a first bidirectional DC-DC converter module, a DC bus, and a unidirectional DC-DC converter module.

[0298] Alternatively, the charging terminal can be powered by a photovoltaic system, a first bidirectional DC-DC converter module, a DC bus, and a unidirectional DC-DC converter module.

[0299] In some embodiments of this application, the method further includes:

[0300] When the charging terminal's power demand is zero, power is supplied to the energy storage system through the AC power system, AC-DC conversion module, DC bus, and second bidirectional DC conversion module.

[0301] Alternatively, the energy storage system can be powered by an AC power system, an AC-DC conversion module, a DC bus, a first bidirectional DC conversion module, and a second bidirectional DC conversion module.

[0302] Alternatively, power can be supplied to the AC power system through energy storage systems, DC buses, and AC-DC conversion modules;

[0303] Alternatively, power can be supplied to the AC power system through a photovoltaic system, a first bidirectional DC-DC conversion module, a DC bus, and an AC-DC conversion module;

[0304] Alternatively, the energy storage system can be powered by a photovoltaic system and a first bidirectional DC-DC converter module.

[0305] In some embodiments of this application, the DC bus includes a first DC bus and a second DC bus;

[0306] A portion of the AC-DC conversion module, a portion of the bidirectional DC conversion module, and a portion of the unidirectional DC conversion module are connected to the first DC bus; another portion of the AC-DC conversion module, another portion of the bidirectional DC conversion module, and another portion of the unidirectional DC conversion module are connected to the second DC bus.

[0307] In some embodiments of this application, the charging system further includes: a fifth disconnection device;

[0308] One end of the fifth disconnecting device is connected to the first DC bus, and the other end is connected to the second DC bus.

[0309] In some embodiments of this application, the charging system further includes: a power distribution module;

[0310] The power distribution module connects the unidirectional DC-DC converter module and the charging terminal, and is used to distribute the DC power output by the unidirectional DC-DC converter module to the charging terminal.

[0311] The charging system control method proposed in the second aspect of this application can reuse bidirectional DC-DC conversion modules, improving the utilization rate of each module and reducing the number of modules in the system architecture. By rationally allocating AC-DC conversion modules and DC-DC conversion modules, interaction between the AC power system, energy storage system, photovoltaic system, and charging terminal is achieved, reducing energy loss. Direct discharge from the energy storage system to the AC power system reduces the number of intermediate modules and improves energy conversion efficiency. The charging system can also execute multiple charging conditions and select the appropriate condition based on the power demand of the charging terminal to improve charging efficiency and reduce energy loss. Furthermore, the dual DC bus structure improves the operational stability of the charging system.

[0312] As the method embodiments are basically similar to the system embodiments, the description is relatively simple, and relevant parts can be found in the description of the system embodiments.

[0313] It should be noted that, for the sake of simplicity, the method embodiments are all described as a series of actions. However, those skilled in the art should understand that the embodiments of this application are not limited to the described order of actions, because according to the embodiments of this application, some steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also understand that the embodiments described in the specification are all preferred embodiments, and the actions involved are not necessarily required by the embodiments of this application.

[0314] Thirdly, some embodiments of this application also provide an electronic device, including: a processor, a memory, and a computer program stored in the memory and capable of running on the processor, wherein the computer program, when executed by the processor, implements a charging system control method of the second aspect.

[0315] Fourthly, some embodiments of this application also provide a computer-readable storage medium including a computer program that, when run on a computer, causes the computer to execute the charging system control method of the second aspect.

[0316] Fifthly, referring to FIG4, some embodiments of this application provide a charging system including a DC power source 200, a DC bus 300, a charging host 400, a DC transformer 500, and a switching device 600.

[0317] The DC source 200 is used to store electrical energy; the DC bus 300 is used to transmit DC power converted from AC power grid 100 or to transmit DC power output from DC source 200; the charging host 400 is used to output charging current to external devices; the DC transformer 500 is used to transform the DC power transmitted from DC bus 300 and / or the DC power output from DC source 200; and the switching device 600 has a first switching state and a second switching state.

[0318] Specifically, in the first switching state, the DC source 200 is electrically connected to the DC bus 300 through the switching device 600, so that power can be transferred between the DC bus 300 and the DC source 200; in the second switching state, the DC source 200 is electrically connected to the charging host 400 through the switching device 600, so that power can be transferred between the DC source 200 and the charging host 400.

[0319] The charging system of the fifth aspect of this application, through the above scheme, divides the circuits for different power sources (DC source 200 and DC source 200 obtained by converting AC source), realizes energy connection and distribution between different DC sources 200, reduces the number of devices in the system, and improves energy conversion efficiency.

[0320] Referring to FIG5, in some embodiments of this application, the DC source 200 is connected to the same DC transformer 500 in both the first switching state and the second switching state. Specifically, the DC transformer 500 includes a first type DC transformer 510 and a second type DC transformer 520. The first type DC transformer 510 is electrically connected to the DC bus 300 and the charging host 400, and the second type DC transformer 520 is electrically connected to the DC bus 300, the charging host 400, and the DC source 200. In both the first switching state and the second switching state, the DC source 200 is connected to the second type DC transformer 520.

[0321] In some embodiments, the switching device 600 includes a first type of switching device 610 and a second type of switching device 620, wherein the first type of switching device 610 is used to control the connection between the second type of DC transformer 520 and the charging host 400, and the second type of switching device 620 is used to control the connection between the second type of DC transformer 520 and the DC bus 300.

[0322] In some embodiments, referring to FIG6, the switching device 600 can be a switch. The first type of switching device 610 is switch S1 in FIG6, and the second type of switching device 620 is switch S2 in FIG6. The first connection terminal of the second type of switching device 620 is connected to the connection line between the first type of switching device 610 and the DC transformer 500. In this way, when the DC transformer 500 has only two connection terminals, one connection terminal of the DC transformer 500 can be reused, and when the DC transformer 500 has multiple connection terminals, the second type of switching device 620 can be directly connected to the second type of DC transformer 520. In some embodiments, when S1 is closed and S2 is open, electrical energy from the AC power grid 100 can be transferred to the DC source 200 via voltage conversion. When the charging host 400 requires lower power, in this mode, the AC power grid 100 supplies power to the charging host 400 through the first type of DC transformer 510 and simultaneously supplies power to the DC source 200 through the second type of DC transformer 520. When S1 is open and S2 is closed, electrical energy from the DC source 200 can be transferred to the charging host 400 via voltage conversion. When the charging host 400 requires higher power, in this mode, the AC power grid 100 supplies power to the charging host 400 through the first type of DC transformer 510 and the DC source 200 through the second type of DC transformer 520. This method achieves convenient energy flow and storage, allows adjustment of the DC transformer 500's operating mode according to the charging host 400's needs, simplifies the connection, and reduces the number of DC transformers 500.

[0323] It should be noted that in the first switching state and the second switching state, the on / off states of the first type of switching device 610 and the second type of switching device 620 are different. In some other states, the first type of switching device 610 and the second type of switching device 620 can both be in the off state. However, it should be noted that in order to avoid damage to the circuit, the first type of switching device 610 and the second type of switching device 620 cannot be turned on at the same time.

[0324] Through the above scheme, the charging system of the fifth aspect of this application classifies the DC transformers 500. The first type of DC transformer 510 is used to output the DC power converted from the AC power grid 100 to the charging host 400 after voltage regulation. The second type of DC transformer 520 is used to charge the DC source 200 through the DC bus 300, or for the DC source 200 to supply power to the charging host 400 through the second type of DC transformer 520. In some examples, the DC source 200 can be a standalone energy storage device, such as a battery, or it can be an energy storage device of a system with power generation capabilities, such as a photovoltaic system. In this case, power can also be supplied to the charging bus through the DC source 200. This application thereby achieves energy connectivity and distribution between different DC sources 200, reduces the number of devices in the system, and improves energy conversion efficiency.

[0325] It should be noted that in the embodiments described above and below, the current transmitted from the AC power grid 100 to the DC bus 300 is converted from AC to DC by the current converter 700.

[0326] Referring to Figure 6, in some embodiments of this application, multiple DC buses 300 can be provided. Taking Figure 6 as an example, the DC bus 300 may include a first DC bus 310 and a second DC bus 320. The first DC bus 310 and the second DC bus 320 are electrically connected to a portion of the current converters 700, and the first DC bus 310 and the second DC bus 320 are connected to a portion of the DC transformers 500. In this way, compared to one DC bus 300, two DC buses 300 reduce the current during normal operation, which is beneficial to improving system stability. In some embodiments, the first DC bus 310 and the second DC bus 320 are connected to half of the current converters 700, the first DC bus 310 and the second DC bus 320 are connected to half of the first type of DC transformers 510, and the first DC bus 310 and the second DC bus 320 are connected to half of the second type of DC transformers 520.

[0327] Based on this, in order to make the charging system of the fifth aspect of this application have better stability and applicability, in some embodiments of this application, the charging system further includes a disconnection device for controlling the conduction and disconnection of current in the system.

[0328] Specifically, referring to FIG7, in some embodiments of this application, the charging system includes a first type of disconnection device 810 for enabling the DC bus 300 to have a first power supply state and a second power supply state. In the first power supply state, power transmission between the first DC bus 310 and a portion of the DC transformers 500 is achieved, and power transmission between the second DC bus 320 and another portion of the DC transformers 500 is achieved. In the second power supply state, power transmission between all the DC transformers 500 is achieved jointly by the first DC bus 310 and the second DC bus 320.

[0329] In some embodiments, specifically, the connection lines between the DC transformer 500 and the DC bus 300 include a first type of connection line and a second type of connection line. The first type of connection line is electrically connected to the first DC bus 310, and the second type of connection line is electrically connected to the second DC bus 320. The first connection terminal of the first type of disconnecting device 810 is connected to the first type of connection line, and the second connection terminal is connected to the second type of connection line. It should be noted that only one first type of disconnecting device 810 is connected to each first type of connection line, and only one first type of disconnecting device 810 is connected to each second type of connection line. More specifically, the first type of disconnecting device 810 can be switches S3 and S4 as shown in Figure 4. When a current converter 700 has a problem or needs maintenance, switches S3 and S4 can be closed, and the two buses can be connected to operate, disconnecting the problematic current converter 700 from the circuit. This arrangement can improve the operational stability of the system.

[0330] Referring to FIG8, in some embodiments of this application, the disconnection device further includes a second type of disconnection device 820 and a third type of disconnection device 830, wherein the second type of disconnection device 820 is used to control the connection between the DC transformer 500 and the first DC bus 310, and the third type of disconnection device 830 is used to control the connection between the DC transformer 500 and the second DC bus 320.

[0331] In some embodiments of this application, in order to enable the first DC bus 310 or the second DC bus 320 to transmit electrical energy independently, a second type of disconnecting device 820 is disposed on the connection line between the first connection terminal of the first type of disconnecting device 810 and the first DC bus 310, and a third type of disconnecting device 830 is disposed on the connection line between the second connection terminal of the first type of disconnecting device 810 and the second DC bus 320. More specifically, the second type of disconnecting device 820 can be switches S31 and S41 in FIG. 5, and the third type of disconnecting device 830 can be switches S32 and S42 in FIG. 5.

[0332] Based on the above scheme, in the first type of DC transformer 510, by disconnecting S31 and S3, maintenance of the DC transformer 500 can be achieved on the line connected to S31. Furthermore, closing S32 maintains the connection between the DC transformer 500 and the second DC bus 320. Similarly, disconnecting S3 and S32 allows maintenance of the DC transformer 500 on the line connected to S32. Furthermore, closing S31 maintains the connection between the DC transformer 500 and the first DC bus 310. When a current converter 700 connected to the first DC bus 310 malfunctions, all S31 disconnectors connected to the first DC bus 310 are disconnected, and S3 and S32 disconnectors are closed. Power is then supplied by the fault-free current converter 700 through the second DC bus 320, allowing all DC transformers 500 to operate normally, thus improving the convenience of maintenance and the stability of the system.

[0333] Similarly, in the second type of DC transformer 520, when S1 is closed and S2 is open, the DC source 200 charges the power distributor; when S1 is open and S2 is closed, closing S4 and opening S41 or S42 allows the first DC bus 310 or the second DC bus 320 to charge the DC source 200 independently, improving the convenience of maintenance and the stability of the system.

[0334] It should be noted that, in the above embodiments, the charging system also includes a power distributor, which is electrically connected to the DC transformer 500 and the charging host 400, to distribute the DC power after being transformed by the DC transformer 500 to the charging host 400.

[0335] Sixthly, some embodiments of this application also provide a control method for a charging system, implemented based on the charging system of the fifth aspect. Specifically, the method includes:

[0336] The switching device 600 is controlled to the first switching state so that the DC bus 300 can transmit electrical energy to the DC source 200 through the DC transformer 500;

[0337] The control switching device 600 is switched to the second switching state so that the DC source 200 can transmit electrical energy to the charging host 400 through the DC transformer 500.

[0338] Specifically, the method also includes:

[0339] Controlling the first type of disconnecting device 810 to be in the disconnected state, so that the DC bus 300 is in the first power supply state, realizing the power transmission between the first DC bus 310 and part of the DC transformer 500 and the power transmission between the second DC bus 320 and another part of the DC transformer 500;

[0340] The first type of disconnect device 810 is controlled to be in the closed state, so that the DC bus 300 is in the second power supply state, and the first DC bus 310 and the second DC bus 320 jointly transmit electrical energy to all DC transformers 500.

[0341] In some embodiments of this application, the method further includes:

[0342] The second type of disconnecting device 820 is controlled to be in the closed state, while the first type of disconnecting device 810 and the third type of disconnecting device 830 are in the open state, thereby realizing the power transmission between the first DC bus 310 and part of the DC transformer 500, and realizing the interruption of the power transmission between the second DC bus 320 and another part of the DC transformer 500.

[0343] The third type of disconnecting device 830 is controlled to be in the closed state, while the first type of disconnecting device 810 and the second type of disconnecting device 820 are in the open state, thereby realizing the power transmission between the second DC bus 320 and part of the DC transformer 500, and realizing the interruption of the power transmission between the first DC bus 310 and another part of the DC transformer 500.

[0344] In some embodiments of this application, the method further includes:

[0345] The second type of disconnecting device 820 is in the open state, while the first type of disconnecting device 810 and the third type of disconnecting device 830 are in the closed state, so that the second DC bus 320 can transmit power to all DC transformers 500 independently.

[0346] The third type of disconnect device 830 is in the open state, while the first type of disconnect device 810 and the second type of disconnect device 820 are in the closed state, so that the first DC bus 310 can transmit power to all DC transformers 500 independently.

[0347] The charging system of the fifth aspect and the charging system control method of the sixth aspect of this application divide the circuits for different power sources (DC source 200 and DC source obtained by converting AC source). By classifying DC transformer 500 and switching device 600, energy connection and distribution between different DC sources 200 are realized, reducing the number of components in the system and improving energy conversion efficiency. The connection method is simple and can be easily maintained through the switching method of disconnection device, which improves the stability of the system and reduces design cost.

[0348] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0349] Those skilled in the art will understand that embodiments of this application can be provided as methods, apparatus, or computer program products. Therefore, embodiments of this application can take the form of entirely hardware embodiments, entirely software embodiments, or embodiments combining software and hardware aspects. Furthermore, embodiments of this application can take the form of computer program products embodied on one or more machine-readable media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0350] This application describes embodiments with reference to flowchart illustrations and / or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of this application. It should be understood that each block of the flowchart illustrations and / or block diagrams, as well as combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, create means for implementing the functions specified in one or more blocks of the flowchart illustrations and / or one or more blocks of the block diagrams.

[0351] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing terminal device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means that implement the functions specified in one or more flowcharts and / or one or more block diagrams.

[0352] These computer program instructions may also be loaded onto a computer or other programmable data processing terminal equipment to cause a series of operational steps to be performed on the computer or other programmable terminal equipment to produce a computer-implemented process, such that the instructions, which execute on the computer or other programmable terminal equipment, provide steps for implementing the functions specified in one or more flowcharts and / or one or more block diagrams.

[0353] Although some embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make further changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of this application.

[0354] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes the element.

[0355] The charging system, charging system control method, electronic device, and storage medium provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A charging system, wherein, include: DC bus, bidirectional DC-DC converter module and at least two DC source systems; The bidirectional DC-DC converter module, when switched to connect the DC bus and a DC source system, is used to convert the DC power from the DC source system and output the converted DC power to the DC bus; or, to convert the DC power from the DC bus and output the converted DC power to the DC source system; when switched to connect between a DC source system and another DC source system, it is used to convert the DC power from the DC source system and output the converted DC power to the other DC source system.

2. The charging system according to claim 1, wherein, The charging system also includes: an AC-DC conversion module; The AC-DC conversion module connects the DC bus and the AC power system, and is used to convert the AC power from the AC power system into DC power and output it to the DC bus.

3. The charging system according to claim 2, wherein, The charging system also includes: a unidirectional DC-DC converter module and a charging terminal; The unidirectional DC-DC converter module connects the DC bus and the charging terminal, and is used to convert the DC power from the DC bus and output the converted DC power to the charging terminal.

4. The charging system according to claim 3, wherein, The at least two DC source systems include an energy storage system and a photovoltaic system, and the bidirectional DC conversion module includes a first bidirectional DC conversion module; the first bidirectional DC conversion module is connected to the DC bus and the energy storage system or the DC bus and the photovoltaic system; or, the first bidirectional DC conversion module is connected to the energy storage system and the photovoltaic system.

5. The charging system according to claim 4, wherein, When the first bidirectional DC-DC converter module connects the energy storage system to the DC bus, the AC power system is used to supply power to the energy storage system. When the first bidirectional DC-DC converter module connects the energy storage system to the DC bus, the energy storage system is used to supply power to the charging terminal; When the first bidirectional DC-DC conversion module connects the photovoltaic system to the DC bus, the photovoltaic system is used to supply power to the charging terminal; When the first bidirectional DC-DC converter module connects the photovoltaic system to the DC bus, the photovoltaic system is also used to supply power to the AC power system; When the first bidirectional DC-DC converter module connects the photovoltaic system and the energy storage system, the photovoltaic system is used to supply power to the energy storage system.

6. The charging system according to claim 5, wherein, When the first bidirectional DC-DC converter module connects the energy storage system to the DC bus, the AC power system is used to supply power to the energy storage system through the AC-DC converter module, the DC bus, and the first bidirectional DC-DC converter module. Alternatively, when the first bidirectional DC-DC converter module connects the energy storage system to the DC bus, the energy storage system is used to supply power to the charging terminal through the first bidirectional DC-DC converter module, the DC bus, and the unidirectional DC-DC converter module. Alternatively, when the first bidirectional DC-DC converter module connects the photovoltaic system to the DC bus, the photovoltaic system is used to supply power to the charging terminal through the first bidirectional DC-DC converter module, the DC bus, and the unidirectional DC-DC converter module. Alternatively, when the first bidirectional DC-DC conversion module connects the photovoltaic system to the DC bus, the photovoltaic system is also used to supply power to the AC power system through the first bidirectional DC-DC conversion module, the DC bus, and the AC-DC conversion module; Alternatively, when the first bidirectional DC-DC converter module connects the photovoltaic system and the energy storage system, the photovoltaic system is used to supply power to the energy storage system through the first bidirectional DC-DC converter module.

7. The charging system according to claim 4, wherein, The charging system also includes: multiple disconnection devices; The plurality of disconnecting devices are used to connect the DC bus, the first bidirectional DC-DC conversion module, the photovoltaic system, and the energy storage system.

8. The charging system according to claim 7, wherein, The plurality of disconnecting devices are used to connect the DC bus and the first bidirectional DC-DC converter module, and / or connect the first bidirectional DC-DC converter module with the photovoltaic system or the first bidirectional DC-DC converter module with the energy storage system, and / or connect the photovoltaic system with the energy storage system.

9. The charging system according to claim 8, wherein, The plurality of disconnection devices include: a first disconnection device, a second disconnection device, a third disconnection device, and a fourth disconnection device; The first disconnecting device is connected at one end to the DC bus and at the other end to the first bidirectional DC-DC converter module; The second disconnecting device is connected at one end to the first bidirectional DC-DC converter module and at the other end to the energy storage system; The third disconnecting device is connected at one end to the connection point of the second disconnecting device and the first bidirectional DC-DC conversion module, and at the other end to the photovoltaic system. The fourth disconnecting device is connected at one end to the connection point between the second disconnecting device and the energy storage system, and at the other end to the connection point between the first disconnecting device and the first bidirectional DC-DC converter module.

10. The charging system according to claim 9, wherein, When the fourth disconnecting device and the third disconnecting device are disconnected, and the second disconnecting device and the first disconnecting device are closed, the energy storage system is connected to the DC bus through the first bidirectional DC-DC converter module. When the fourth disconnecting device and the second disconnecting device are disconnected, and the third disconnecting device and the first disconnecting device are closed, the photovoltaic system is connected to the DC bus through the first bidirectional DC conversion module; When the second disconnecting device and the first disconnecting device are disconnected, and the fourth disconnecting device and the third disconnecting device are closed, the photovoltaic system is connected to the energy storage system through the first bidirectional DC-DC conversion module.

11. The charging system according to claim 9, wherein, When the first disconnecting device and the fourth disconnecting device are closed, and the second disconnecting device and the third disconnecting device are open, the energy storage system is connected to the DC bus; the energy storage system is used to supply power to the AC power system through the DC bus and the AC-DC conversion module.

12. The charging system according to claim 4, wherein, The bidirectional DC-DC converter module further includes a second bidirectional DC-DC converter module; the second bidirectional DC-DC converter module is connected to the DC bus and the energy storage system; The AC power system is also used to supply power to the energy storage system through the AC-DC conversion module, the DC bus and the second bidirectional DC conversion module; Alternatively, the energy storage system is also used to supply power to the charging terminal through the second bidirectional DC-DC converter module, the DC bus, and the unidirectional DC-DC converter module.

13. The charging system according to claim 12, wherein, The AC power system is also used to supply power to the charging terminal through the AC-DC conversion module, the DC bus, and the unidirectional DC conversion module.

14. The charging system according to claim 13, wherein, When the power demand of the charging terminal is greater than or equal to the power threshold, the AC power system supplies power to the charging terminal through the AC-DC conversion module, the DC bus, and the unidirectional DC conversion module; the energy storage system supplies power to the charging terminal through the second bidirectional DC conversion module, the DC bus, and the unidirectional DC conversion module; and the photovoltaic system supplies power to the charging terminal through the first bidirectional DC conversion module, the DC bus, and the unidirectional DC conversion module. Alternatively, when the power demand of the charging terminal is greater than or equal to the power threshold, the AC power system supplies power to the charging terminal through the AC-DC conversion module, the DC bus, and the unidirectional DC conversion module; the energy storage system supplies power to the charging terminal through the first bidirectional DC conversion module, the DC bus, and the unidirectional DC conversion module.

15. The charging system according to claim 13, wherein, When the power demand of the charging terminal is greater than zero and less than the power threshold, the AC power system is used to supply power to the charging terminal through the AC-DC conversion module, the DC bus and the unidirectional DC conversion module; Alternatively, the energy storage system is used to supply power to the charging terminal through the second bidirectional DC-DC converter module, the DC bus, and the unidirectional DC-DC converter module; Alternatively, the energy storage system is used to supply power to the charging terminal through the first bidirectional DC-DC converter module, the DC bus and the unidirectional DC-DC converter module; Alternatively, the photovoltaic system is used to supply power to the charging terminal through the first bidirectional DC-DC conversion module, the DC bus, and the unidirectional DC-DC conversion module.

16. The charging system according to claim 13, wherein, When the power demand of the charging terminal is zero, the AC power system is used to supply power to the energy storage system through the AC-DC conversion module, the DC bus and the second bidirectional DC conversion module; Alternatively, the AC power system is used to supply power to the energy storage system through the AC-DC conversion module, the DC bus, the first bidirectional DC conversion module, and the second bidirectional DC conversion module; Alternatively, the energy storage system is used to supply power to the AC power system through the DC bus and the AC-DC conversion module; Alternatively, the photovoltaic system is used to supply power to the AC power system through the first bidirectional DC-DC conversion module, the DC bus, and the AC-DC conversion module; Alternatively, the photovoltaic system can be used to power the energy storage system through the first bidirectional DC-DC conversion module.

17. The charging system according to claim 3, wherein, The DC bus includes a first DC bus and a second DC bus; A portion of the AC-DC conversion module, a portion of the bidirectional DC conversion module, and a portion of the unidirectional DC conversion module are connected to the first DC bus; another portion of the AC-DC conversion module, another portion of the bidirectional DC conversion module, and another portion of the unidirectional DC conversion module are connected to the second DC bus.

18. The charging system according to claim 17, wherein, The charging system also includes: a fifth disconnection device; One end of the fifth disconnecting device is connected to the first DC bus, and the other end is connected to the second DC bus.

19. The charging system according to claim 3, wherein, Also includes: Power distribution module; The power distribution module connects the unidirectional DC-DC converter module and the charging terminal, and is used to distribute the DC power output by the unidirectional DC-DC converter module to the charging terminal.

20. A charging system control method, wherein, Applied to the charging system as described in claims 1-19, the method includes: Switching a DC power source system to be connected to the DC bus via the bidirectional DC conversion module and controlling the DC power source system to supply power to the AC power system, or controlling the AC power system to supply power to the DC power source system; Alternatively, one DC power source system can be switched to connect with another DC power source system through the bidirectional DC-DC conversion module, and the one DC power source system can be controlled to supply power to the other DC power source system.

21. A charging system, wherein, include: DC source; A DC bus is used to transmit DC power obtained by converting electrical energy from an AC power grid, or to transmit DC power output from the DC source. The charging host is used to output charging current to external devices; A DC transformer is used to transform the DC power transmitted through the DC bus and / or the DC power output from the DC source. as well as The switching device has a first switching state and a second switching state; In the first switching state, the DC source is electrically connected to the DC bus through the DC transformer and the switching device, so that power can be transferred between the DC bus and the DC source; in the second switching state, the DC source is electrically connected to the charging host through the DC transformer and the switching device, so that power can be transferred between the DC source and the charging host.

22. The charging system according to claim 21, wherein, In both the first switching state and the second switching state, the DC source is connected to the same DC transformer.

23. The charging system according to claim 22, wherein, The DC transformer includes: A first-type DC transformer, electrically connected to the DC bus and the charging host; and The second type of DC transformer is electrically connected to the DC bus, the charging host and the DC source; In both the first switching state and the second switching state, the DC source is connected to the second type of DC transformer.

24. The charging system according to claim 23, wherein, The switching device includes: The first type of switching device is used to control the connection between the second type of DC transformer and the charging host; The second type of switching device is used to control the connection between the second type of DC transformer and the DC bus.

25. The charging system according to claim 24, wherein, In the first switching state and the second switching state, the on / off states of the first type of switching device and the second type of switching device are different.

26. The charging system according to claim 21, wherein, The charging system also includes: A current converter is used to convert electrical energy from the AC power grid into DC power and output it to the DC bus.

27. The charging system according to claim 26, wherein, The DC bus includes: The first DC bus and the second DC bus are electrically connected to a portion of the current converters, and the first DC bus and the second DC bus are connected to a portion of the DC transformers.

28. The charging system according to claim 27, wherein, The charging system also includes: The first type of disconnection device is used to enable the DC bus to have a first power supply state and a second power supply state; In the first power supply state, power transmission between the first DC bus and a portion of the DC transformers is achieved, and power transmission between the second DC bus and another portion of the DC transformers is achieved. In the second power supply state, power transmission between all DC transformers is achieved through the first DC bus and the second DC bus.

29. The charging system according to claim 28, wherein, The connection lines connecting the DC transformer to the DC bus include: The first type of connection line is electrically connected to the first DC bus; The second type of connection line is electrically connected to the second DC bus; The first connection end of the first type of disconnecting device is connected to the first type of connection line, and the second connection end is connected to the second type of connection line.

30. The charging system according to claim 29, wherein, Each of the first type of connection lines is connected to only one of the first type of disconnecting devices, and each of the second type of connection lines is also connected to only one of the first type of disconnecting devices.

31. The charging system according to claim 28, wherein, The charging system also includes: The second type of disconnection device is used to control the connection between the DC transformer and the first DC bus.

32. The charging system according to claim 31, wherein, The charging system also includes: The third type of disconnection device is used to control the connection between the DC transformer and the second DC bus.

33. The charging system according to claim 32, wherein, The second type of disconnecting device is installed on the connection line between the first connection terminal of the first type of disconnecting device and the first DC bus. The third type of disconnecting device is installed on the connection line between the second connection terminal of the first type of disconnecting device and the second DC bus.

34. The charging system according to any one of claims 21 to 33, wherein, The charging system also includes: A power distributor is electrically connected to the DC transformer and the charging host to distribute the DC power transformed by the DC transformer to the charging host.

35. A control method for a charging system, wherein, include: The control switching device is switched to the first switching state so that the DC bus can transmit electrical energy to the DC source through the DC transformer; The control switching device is switched to the second switching state so that the DC source can transmit electrical energy to the charging host through the DC transformer.

36. The control method according to claim 35, wherein, include: Controlling the first type of disconnecting device to be in the disconnected state enables the DC bus to be in the first power supply state, thereby realizing the power transmission between the first DC bus and part of the DC transformers, as well as the power transmission between the second DC bus and another part of the DC transformers. By controlling the first type of disconnecting device to be in the closed state, the DC bus is put into the second power supply state, so that the first DC bus and the second DC bus can jointly transmit electrical energy to all DC transformers.

37. The control method according to claim 36, wherein, include: The second type of disconnecting device is controlled to be in the closed state, while the first type of disconnecting device and the third type of disconnecting device are in the open state, so as to realize the power transmission between the first DC bus and part of the DC transformer, and to realize the interruption of the power transmission between the second DC bus and another part of the DC transformer. The third type of disconnecting device is controlled to be in the closed state, while the first type of disconnecting device and the second type of disconnecting device are in the open state, so as to realize the power transmission between the second DC bus and part of the DC transformer, and to realize the interruption of the power transmission between the first DC bus and another part of the DC transformer.

38. The control method according to claim 37, wherein, include: The second type of disconnecting device is controlled to be in the open state, while the first type of disconnecting device and the third type of disconnecting device are in the closed state, so that the second DC bus can transmit electrical energy to all DC transformers independently; The third type of disconnect device is controlled to be in the open state, while the first type of disconnect device and the second type of disconnect device are in the closed state, so that the first DC bus can transmit electrical energy to all DC transformers independently.

39. An electronic device, wherein, include: A processor, a memory, and a computer program stored in the memory and capable of running on the processor, wherein the computer program, when executed by the processor, implements a charging system control method as described in claim 20 or a charging system control method as described in any one of claims 35 to 38.

40. A computer-readable storage medium, wherein, Includes a computer program that, when run on a computer, causes the computer to perform the charging system control method of claim 20 or the charging system control method of any one of claims 35 to 38.

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