Direct current charging host system and control method

Abstract

The application relates to the technical field of direct-current charging, and particularly provides a direct-current charging host system and a control method, aiming to solve the technical problems of poor power scheduling flexibility and low maintenance efficiency caused by the fixed binding of a direct-current charging module and a gun position. For the purpose, the direct-current charging host system comprises a direct-current contactor group and a plurality of direct-current charging devices connected to form a first ring network matrix and a second ring network matrix, the direct-current contactor group comprises a plurality of ring network branch contactors and a plurality of interconnection bus contactors, wherein the first ring network matrix and the second ring network matrix each comprise a plurality of direct-current charging devices and a plurality of ring network branch contactors; in the first ring network matrix and the second ring network matrix, two adjacent direct-current charging devices are connected through a ring network branch contactor; and the direct-current charging devices in the first ring network matrix are connected with the direct-current charging devices in the second ring network matrix through the interconnection bus contactors.

Description

Technical Field

[0001] This application relates to the field of DC charging technology, specifically providing a DC charging host system and control method. Background Technology

[0002] With the large-scale application of national standard DC charging main units, the requirements for dynamic power scheduling, fault isolation, and system redundancy are increasing as the core of power output. According to the national standard requirements for DC charging main units, they must have the capabilities of multi-module parallel connection, multi-gun sharing, and rapid fault response to adapt to the charging needs of different vehicle models and station operation scenarios.

[0003] Currently, most DC charging host systems on the market adopt a single-power matrix topology. In this topology, multiple DC charging devices are included, each consisting of a DC charging module and a charging gun. The DC charging module and the charging gun are fixedly bound, meaning one DC charging module can only supply power to the bound charging gun, resulting in poor power scheduling flexibility. Furthermore, if a charging module of a DC charging device fails, the charging gun connected to that device will be unable to continue charging the energy storage device, thus affecting charging continuity.

[0004] Accordingly, there is a need in the field for a new DC charging host system to solve the above problems. Summary of the Invention

[0005] In order to overcome the above-mentioned defects, this application is made to provide a solution or at least a partial solution to the technical problem that in the prior art, DC charging hosts mostly adopt a single power matrix topology, in which the DC charging module is fixedly bound to the gun position, resulting in poor power scheduling flexibility and low maintenance efficiency.

[0006] In a first aspect, this application provides a DC charging host system, comprising: a DC contactor group connecting a first ring network matrix and a second ring network matrix, and a plurality of DC charging devices, wherein the DC contactor group includes a plurality of ring network branch contactors and a plurality of interconnecting bus contactors, wherein...

[0007] Both the first ring network matrix and the second ring network matrix include multiple DC charging devices and multiple ring network branch contactors;

[0008] In the first ring network matrix and the second ring network matrix, two adjacent DC charging devices are connected through a ring network branch contactor;

[0009] The DC charging devices in the first ring network matrix are connected to the DC charging devices in the second ring network matrix via interconnecting bus contactors.

[0010] In one technical solution of the aforementioned DC charging host system, the DC charging device includes a DC charging module, a DC bus, and a charging output interface. Two adjacent DC charging devices are connected via a DC contactor.

[0011] The DC charging module of any DC charging device is connected to the charging output interface and forms a DC bus at the connection point;

[0012] The DC buses of the two adjacent DC charging devices are connected by a ring network branch contactor.

[0013] In one technical solution of the aforementioned DC charging host system, the DC charging devices in the first ring network matrix and the DC charging devices in the second ring network matrix are connected via interconnecting bus contactors, including:

[0014] The DC bus of a DC charging device in the first ring network matrix is ​​connected to the DC bus of a DC charging device in the second ring network matrix via an interconnecting bus contactor.

[0015] In one technical solution of the aforementioned DC charging host system, the number of DC charging devices in the first ring network matrix and the second ring network matrix is ​​the same.

[0016] Secondly, this application provides a control method for the DC charging host system of the first aspect, comprising:

[0017] Obtain the operating mode of the DC charging host;

[0018] According to the operating mode, the interconnecting bus contactor and / or the ring network branch contactor are controlled.

[0019] In one technical solution of the above control method, where the operating mode is single-ring network power distribution, the step of controlling the interconnecting bus contactor and / or ring network branch contactor according to the operating mode includes:

[0020] For any ring network matrix, obtain the charging power of the DC charging modules that are in an idle state and the target charging output interface in the ring network matrix;

[0021] The number of DC charging modules is determined based on the charging power.

[0022] Based on the number of DC charging modules, select the DC charging module closest to the target charging output interface from the DC charging modules that are in an idle operating state as the power supply charging module;

[0023] Determine the power supply path between the power supply and charging module and the target charging output interface;

[0024] Close all contactors in the ring network branch circuits along the power supply path.

[0025] In one technical solution of the above control method, the operating mode is charging pile fault isolation. Then, the step of controlling the interconnecting bus contactor and / or ring network branch contactor according to the operating mode includes:

[0026] Acquire DC charging equipment whose operating status is faulty;

[0027] Disconnect the interconnecting bus contactor and / or ring network branch contactor directly connected to the DC charging equipment whose operating state is faulty.

[0028] In one technical solution of the above control method, the operating mode is ring network fault isolation. Therefore, controlling the interconnecting bus contactor and / or the ring network branch contactor according to the operating mode includes:

[0029] Disconnect all interconnecting bus contactors.

[0030] In one technical solution of the above control method, the operating mode is cross-ring network power backup. Therefore, controlling the interconnecting bus contactor and / or ring network branch contactor according to the operating mode includes:

[0031] Identify DC charging equipment that is in a faulty operating state and disconnect the ring network branch contactor connected to the faulty DC charging equipment.

[0032] The interconnecting bus contactor connected to the DC charging equipment whose operating state is faulty is closed.

[0033] Find an idle DC charging device in another ring network matrix;

[0034] Determine the power supply path between the idle DC charging device and the DC charging device whose operating state is faulty;

[0035] The contactors of the ring network branch on the power supply path are closed.

[0036] In one technical solution of the above control method, where the operating mode is maintenance and repair, the step of controlling the interconnecting bus contactor and / or ring network branch contactor according to the operating mode includes:

[0037] Disconnect all ring network branch contactors in the ring network matrix where the DC charging equipment to be inspected is located.

[0038] Disconnect all interconnecting bus contactors;

[0039] Once it is determined that the DC charging equipment to be repaired has been repaired, all ring network branch contactors in the ring network matrix where the DC charging equipment to be repaired is located are closed.

[0040] All of the aforementioned interconnecting bus contactors are closed.

[0041] This application provides a DC charging host system and control method. The DC charging host system includes: a DC contactor group connecting a first ring network matrix and a second ring network matrix, and multiple DC charging devices. The DC contactor group includes multiple ring network branch contactors and multiple interconnecting bus contactors. Both the first and second ring network matrices include multiple DC charging devices and multiple ring network branch contactors. In the first and second ring network matrices, two adjacent DC charging devices are connected through a ring network branch contactor. The DC charging devices in the first and second ring network matrices are connected to each other through interconnecting bus contactors, thereby improving the power scheduling flexibility and maintenance efficiency of the DC charging host. Attached Figure Description

[0042] The disclosure of this application will become more readily understood with reference to the accompanying drawings. It will be readily understood by those skilled in the art that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this application. Furthermore, similar numbers in the drawings are used to denote similar components, wherein:

[0043] Figure 1 This is a structural diagram of a DC charging host system provided in an embodiment of this application;

[0044] Figure 2 This is a flowchart of a control method embodiment one provided in this application;

[0045] Figure 3 This is a flowchart of a second embodiment of a control method provided in this application;

[0046] Figure 4 This is a flowchart of a third embodiment of a control method provided in this application;

[0047] Figure 5 This is a flowchart of a fourth embodiment of a control method provided in this application;

[0048] Figure 6 This is a flowchart of a fifth embodiment of a control method provided in this application;

[0049] Figure 7 This is a flowchart of a control method embodiment six provided in this application.

[0050] List of reference numerals in the attached diagram:

[0051] 1: Ring network branch contactor; 2: DC charging module; 3: Charging output interface; 4: Interconnecting bus contactor. Detailed Implementation

[0052] Some embodiments of this application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of this application and are not intended to limit the scope of protection of this application.

[0053] In the description of this application, "module" and "processor" can include hardware, software, or a combination of both. A module can include hardware circuitry, various suitable sensors, communication ports, memory, and can also include software components, such as program code, or a combination of software and hardware. A processor can be a central processing unit, microprocessor, image processor, digital signal processor, or any other suitable processor. The processor has data and / or signal processing capabilities. The processor can be implemented in software, in hardware, or a combination of both. Non-transitory computer-readable storage media includes any suitable medium capable of storing program code, such as magnetic disks, hard disks, optical disks, flash memory, read-only memory, random access memory, etc. The term "A and / or B" means all possible combinations of A and B, such as only A, only B, or A and B. The terms "at least one A or B" or "at least one of A and B" have a similar meaning to "A and / or B" and can include only A, only B, or A and B. The singular terms "a" or "this" can also include plural forms.

[0054] Currently, DC charging stations employ a single-power matrix topology. In this topology, a single DC charging module can only supply power to the connected charging gun. When that charging gun is idle, the corresponding DC charging module cannot supply power to other charging guns. Furthermore, if a charging module in the DC charging station suddenly malfunctions or requires maintenance while a user is charging an energy storage device, charging must be interrupted, thus affecting the continuity of charging.

[0055] Based on this, in order to solve the above-mentioned technical problems, the technical concept of this application is to provide a new DC charging host system to improve the power scheduling flexibility and maintenance efficiency of the DC charging host.

[0056] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0057] Figure 1 This is a structural diagram of a DC charging host system provided in an embodiment of this application. Figure 1 As shown, specifically, the system includes: a group of DC contactors connected to form a first ring network matrix and a second ring network matrix, and multiple DC charging devices.

[0058] In this embodiment, the DC contactor group includes multiple ring network branch contactors and multiple interconnecting bus contactors. The DC charging pile includes a charging host and a charging terminal. The charging host includes a DC charging module, a first ring network matrix, a second ring network matrix, and a charging output interface. The charging terminal includes a charging gun and a contactor. The charging host and the charging terminal are connected via a DC bus.

[0059] Both the first and second ring network matrices include multiple DC charging devices and multiple ring network branch contactors. The first and second ring network matrices have the same number of DC charging devices, and in each ring network matrix, multiple DC charging devices are interconnected to form a complete loop. Adjacent DC charging devices are connected through a ring network branch contactor.

[0060] The DC charging devices in the first ring network matrix and the DC charging devices in the second ring network matrix are connected via interconnecting bus contactors. Specifically, the DC bus of one DC charging device in the first ring network matrix is ​​connected to the DC bus of one DC charging device in the second ring network matrix via an interconnecting bus contactor. The interconnecting bus contactors connect the various DC charging devices in the two ring network matrices.

[0061] A DC charging device includes a DC charging module, a DC bus, and a charging output interface. The DC charging module of any DC charging device is connected to the charging interface, and a DC bus is formed at the connection point. The DC buses of two adjacent DC charging devices are connected through a ring network branch contactor.

[0062] In this embodiment, for example, both the first ring network matrix and the second ring network matrix have 6 DC charging devices, each ring network matrix has 6 ring network branch contactors, and the two ring network matrices are connected by 6 interconnecting bus contactors.

[0063] In this embodiment, the first and second ring network matrices can be isolated from each other via interconnecting bus contactors, ensuring that if one ring network matrix fails, the other can continue to operate normally. Within any ring network matrix, if a DC charging device malfunctions or requires maintenance, it can be isolated by controlling the connected DC contactor, thus not affecting the normal operation of other DC charging devices within the same ring network matrix. For a charging gun corresponding to a particular DC charging device, controlling the DC contactor allows control of other DC charging devices to supply power, enabling flexible adjustment of the charging gun's power. This improves the power scheduling flexibility and maintenance efficiency of the DC charging host system.

[0064] Figure 2 This is a flowchart of one embodiment of a control method provided in this application. Figure 2 As shown, the method includes:

[0065] Step S1: Obtain the operating mode of the DC charging host.

[0066] In this embodiment, the DC charging host has multiple operating modes. These operating modes can be set by maintenance personnel on the DC charging host or automatically based on the operating status.

[0067] Step S2: Control the interconnecting bus contactor and / or the ring network branch contactor according to the operating mode.

[0068] In this embodiment, control schemes for the interconnecting bus contactors and / or ring network branch contactors are stored for different operating modes. When an operating mode is acquired, the control scheme corresponding to that operating mode is retrieved from the memory, and the interconnecting bus contactors and / or ring network branch contactors are closed or opened according to the control scheme.

[0069] In this embodiment, the operating mode of the DC charging host is obtained; according to the operating mode, the interconnecting bus contactor and / or the ring network branch contactor are controlled, thereby realizing the functions of power distribution, system maintenance and fault isolation of the DC charging host system.

[0070] Figure 3 This is a flowchart of a second embodiment of a control method provided in this application. Based on the above embodiments, as follows... Figure 3 As shown, specifically, after step S1, if the operating mode is single-ring network power allocation, then the specific implementation of step S2 includes:

[0071] Step S31: For any ring network matrix, obtain the charging power of the DC charging module and the target charging output interface that are in an idle state in the ring network matrix.

[0072] In this embodiment, within any ring network matrix, the output power of all DC charging modules in the matrix and the connection status of the charging gun of each DC charging device are obtained. For a DC charging device, if the output power of the DC charging module is 0, then the operating status of the DC charging module is idle. The DC charging module obtains the maximum charging power supported by the user's energy storage device, which is the charging power of the target charging output interface.

[0073] Step S32: Determine the number of DC charging modules based on the charging power.

[0074] In this embodiment, each DC charging module has the same rated charging power. The charging power is the sum of the rated charging power of multiple DC charging modules. The quotient of the charging power and the rated charging power is the number of DC charging modules. If the number of DC charging modules is not an integer, it is rounded down.

[0075] Step S33: Based on the number of DC charging modules, select the DC charging module closest to the target charging output interface from the DC charging modules that are in an idle operating state as the power supply charging module.

[0076] In this embodiment, the distance between the idle DC charging module and the target charging output interface is obtained, and the distances are sorted to obtain a sorted list of DC charging modules. In order, multiple DC charging modules, the same number as the number of DC charging modules, are taken out from the sorted list as power supply charging modules.

[0077] Step S34: Determine the power supply path between the power supply charging module and the target charging output interface.

[0078] In this embodiment, according to the preset path search algorithm, multiple power supply paths from the power supply charging module to the target charging output interface can be obtained, and the shortest path is selected from these multiple power supply paths as the power supply path.

[0079] Step S35: Close all contactors in the ring network branches along the power supply path.

[0080] In this embodiment, all ring network branch contactors on the power supply path are closed, and the charging gun corresponding to the power supply charging module is set to standby mode.

[0081] In this embodiment, if the operating mode is single-ring network power allocation, then for any ring network matrix, the charging power of the DC charging modules in the ring network matrix that are in an idle state and the target charging output interface are obtained; based on the charging power, the number of DC charging modules is determined; based on the number of DC charging modules, the DC charging module closest to the target charging output interface from the DC charging modules in the idle state is selected as the power supply charging module; the power supply path between the power supply charging module and the target charging output interface is determined; and all ring network branch contactors on the power supply path are closed, thereby dynamically allocating power according to the vehicle charging demand.

[0082] Figure 4 This is a flowchart of a third embodiment of a control method provided in this application. Based on the above embodiments, as follows... Figure 4 As shown, specifically, after step S1, if the operating mode is charging pile fault isolation, then the specific implementation of step S2 includes:

[0083] S41: Obtain the DC charging equipment whose operating status is faulty.

[0084] In this embodiment, the DC charging device sends operating status data to the DC charging host at preset intervals to determine in a timely manner whether the DC charging device has malfunctioned.

[0085] S42: Disconnect the interconnecting bus contactor and / or ring network branch contactor directly connected to the DC charging equipment that is in a faulty operating state.

[0086] In this embodiment, after determining that the DC charging equipment has failed, the interconnecting bus contactor and the ring network branch contactor connected to the DC charging equipment are identified, and the interconnecting bus contactor and / or the ring network branch contactor are disconnected.

[0087] In this embodiment, if the operating mode is charging pile fault isolation, the DC charging equipment with a faulty operating status is obtained, and then the interconnecting bus contactor and / or ring network branch contactor directly connected to the DC charging equipment with a faulty operating status are disconnected. This allows the faulty DC charging equipment to be isolated in a timely manner without affecting the normal operation of other DC charging equipment, thereby improving the operating efficiency of the charging station.

[0088] Figure 5 This is a flowchart of a fourth embodiment of a control method provided in this application. Based on the above embodiments, as follows... Figure 5 As shown, specifically, after step S1, if the operating mode is ring network fault isolation, then the specific implementation of step S2 includes:

[0089] Step S51: Disconnect all interconnecting bus contactors.

[0090] In this embodiment, if a fault is detected in either the first ring network matrix or the second ring network matrix, all interconnecting bus contactors connected to the first and second ring network matrices are disconnected to isolate the faulty ring network matrix from the normally operating ring network matrix, thereby ensuring the core charging capability.

[0091] Figure 6 This is a flowchart of a fifth embodiment of a control method provided in this application. Based on the above embodiments, as follows... Figure 6 As shown, specifically, after step S1, if the operating mode is cross-ring network power backup, then the specific implementation of step S2 includes:

[0092] Step S61: Obtain the DC charging equipment whose operating status is faulty, and disconnect the contactor of the ring network branch connected to the DC charging equipment whose operating status is faulty.

[0093] In this embodiment, if the DC charging device in one of the ring network matrices is in a faulty operating state, the ring network branch contactor connected to the DC charging device will be disconnected to isolate the faulty DC charging device.

[0094] Step S62: Close the interconnect bus contactor connected to the DC charging equipment whose operating status is faulty.

[0095] In this embodiment, when the DC charging device is unable to charge the user and there is no idle DC charging device in the ring network matrix where the DC charging device is located, an idle DC charging device in another ring network matrix can be connected to the charging gun of the DC charging device to continue charging the user. Therefore, the interconnection bus connected to the DC charging device is closed.

[0096] Step S63: Obtain an idle DC charging device in another ring network matrix.

[0097] In this embodiment, the charging status of the DC charging device in another ring network matrix is ​​obtained. If the charging gun of the DC charging device is not connected and the charging power of the DC charging device is 0, then the DC charging device is determined to be in an idle state.

[0098] Step S64: Determine the power supply path between the idle DC charging equipment and the DC charging equipment whose operating status is faulty.

[0099] In this embodiment, if a DC charging device in a faulty operating state is connected to a DC charging device in another ring network matrix via an interconnecting bus contactor, it is necessary to determine the nearest idle DC charging device to a DC charging device in the other ring network matrix. The path between these two DC charging devices is the power supply path.

[0100] Step S65: Close the contactor of the ring network branch on the power supply path.

[0101] In this embodiment, all ring network branch contactors on the control power supply path are closed, thereby enabling the DC charging equipment in another ring network matrix to continue supplying power to the DC charging equipment in the current ring network matrix that has failed.

[0102] In this embodiment, if the operating mode is cross-ring network power backup, then the DC charging equipment with a faulty operating status is identified, and the ring network branch contactor connected to the DC charging equipment with a faulty operating status is disconnected; the interconnecting bus contactor connected to the DC charging equipment with a faulty operating status is closed; an idle DC charging equipment in another ring network matrix is ​​identified; the power supply path between the idle DC charging equipment and the DC charging equipment with a faulty operating status is determined; and the ring network branch contactor on the power supply path is closed to achieve cross-matrix power supply, thereby improving the reliability of the DC charging equipment.

[0103] Figure 7 This is a flowchart of a sixth embodiment of a control method provided in this application. Based on the above embodiments, as follows... Figure 7 As shown, specifically, after step S1, if the operating mode is maintenance and repair, then the specific implementation method of step S2 includes:

[0104] Step S71: Disconnect all ring network branch contactors in the ring network matrix where the DC charging equipment to be inspected is located.

[0105] In this embodiment, if the operating mode is maintenance and repair, all ring network branch contactors in the ring network matrix where the DC charging equipment to be repaired is located are disconnected, that is, all DC charging equipment in the ring network matrix is ​​isolated.

[0106] Step S72: Disconnect all interconnecting bus contactors.

[0107] In this embodiment, all interconnecting bus contactors are disconnected, thereby isolating the two ring network matrices.

[0108] Step S73: Once it is determined that the DC charging equipment to be repaired has completed the repair process, all ring network branch contactors in the ring network matrix where the DC charging equipment to be repaired is located are closed.

[0109] After the DC charging equipment to be repaired has been repaired, all ring network branch contactors in the ring network matrix where the DC charging equipment is located are closed to restore the ring network power supply.

[0110] Step S74: Close all interconnecting bus contactors.

[0111] In this embodiment, all interconnecting bus contactors are closed to achieve interconnection of the two ring network matrices.

[0112] In this embodiment, all ring network branch contactors in the ring network matrix containing the DC charging equipment to be repaired are disconnected; all interconnecting bus contactors are disconnected; once the repair of the DC charging equipment to be repaired is completed, all ring network branch contactors in the ring network matrix containing the DC charging equipment to be repaired are closed; all interconnecting bus contactors are closed. Thus, only the ring network rectangle containing the DC charging equipment to be repaired needs to be isolated, without affecting the normal operation of other ring network rectangles, thereby improving the maintenance efficiency of the DC charging equipment.

[0113] It should be noted that although the steps in the above embodiments are described in a specific order, those skilled in the art will understand that, in order to achieve the effect of this application, different steps do not necessarily have to be executed in such an order. They can be executed simultaneously (in parallel) or in other orders, and these variations are all within the scope of protection of this application.

[0114] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A DC charging host system, characterized in that, include: A DC contactor group and multiple DC charging devices are connected to form a first ring network matrix and a second ring network matrix. The DC contactor group includes multiple ring network branch contactors and multiple interconnecting bus contactors. Both the first ring network matrix and the second ring network matrix include multiple DC charging devices and multiple ring network branch contactors; In the first ring network matrix and the second ring network matrix, two adjacent DC charging devices are connected through a ring network branch contactor; The DC charging devices in the first ring network matrix are connected to the DC charging devices in the second ring network matrix via interconnecting bus contactors.

2. The system according to claim 1, characterized in that, The DC charging device includes a DC charging module, a DC bus, and a charging output interface. Two adjacent DC charging devices are connected via a DC contactor. The DC charging module of any DC charging device is connected to the charging output interface and forms a DC bus at the connection point; The DC buses of the two adjacent DC charging devices are connected by a ring network branch contactor.

3. The system according to claim 2, characterized in that, The DC charging devices in the first ring network matrix and the DC charging devices in the second ring network matrix are connected via interconnecting bus contactors, including: The DC bus of a DC charging device in the first ring network matrix is ​​connected to the DC bus of a DC charging device in the second ring network matrix via an interconnecting bus contactor.

4. The system according to claim 3, characterized in that, The number of DC charging devices in the first ring network matrix and the second ring network matrix is ​​the same.

5. A control method for the DC charging host system according to any one of claims 1-4, characterized in that, include: Obtain the operating mode of the DC charging host; According to the operating mode, the interconnecting bus contactor and / or the ring network branch contactor are controlled.

6. The method according to claim 5, characterized in that, The operating mode is single-ring network power distribution. Therefore, the control of the interconnecting bus contactor and / or ring network branch contactor according to the operating mode includes: For any ring network matrix, obtain the charging power of the DC charging modules that are in an idle state and the target charging output interface in the ring network matrix; The number of DC charging modules is determined based on the charging power. Based on the number of DC charging modules, select the DC charging module closest to the target charging output interface from the DC charging modules that are in an idle operating state as the power supply charging module; Determine the power supply path between the power supply and charging module and the target charging output interface; Close all contactors in the ring network branch circuits along the power supply path.

7. The method according to claim 5, characterized in that, If the operating mode is charging pile fault isolation, then the control of the interconnecting bus contactor and / or ring network branch contactor according to the operating mode includes: Acquire DC charging equipment whose operating status is faulty; Disconnect the interconnecting bus contactor and / or ring network branch contactor directly connected to the DC charging equipment whose operating state is faulty.

8. The method according to claim 5, characterized in that, If the operating mode is ring network fault isolation, then the control of the interconnecting bus contactor and / or ring network branch contactor according to the operating mode includes: Disconnect all interconnecting bus contactors.

9. The method according to claim 5, characterized in that, The operating mode is cross-ring network power backup. Therefore, the control of the interconnecting bus contactor and / or ring network branch contactor according to the operating mode includes: Identify DC charging equipment that is in a faulty operating state and disconnect the ring network branch contactor connected to the faulty DC charging equipment. The interconnecting bus contactor connected to the DC charging equipment whose operating state is faulty is closed. Find an idle DC charging device in another ring network matrix; Determine the power supply path between the idle DC charging device and the DC charging device whose operating state is faulty; The contactors of the ring network branch on the power supply path are closed.

10. The method according to claim 5, characterized in that, If the operating mode is maintenance and repair, then the control of the interconnecting bus contactor and / or ring network branch contactor according to the operating mode includes: Disconnect all ring network branch contactors in the ring network matrix where the DC charging equipment to be inspected is located. Disconnect all interconnecting bus contactors; Once it is determined that the DC charging equipment to be repaired has been repaired, all ring network branch contactors in the ring network matrix where the DC charging equipment to be repaired is located are closed. All of the aforementioned interconnecting bus contactors are closed.

Images