Storage and charging system based on AC / DC hybrid bus architecture and its working method

Abstract

The embodiments of the present disclosure provide a storage and charging system based on an AC / DC hybrid busbar architecture and a working method thereof; they relate to the field of photovoltaic storage and charging technology. The method includes a DC charger module obtaining charging requirements and transmitting them to an energy management module; the energy management module receives the charging requirements and controls the power storage module or the AC / DC conversion module to charge the DC charger module by controlling the switch of the grid-connected module according to the photovoltaic power generation situation and the storage and charging system parameters; the AC / DC conversion module obtains the power characteristic value of the DCDC power module in the DC charger module and matches the charging power requirement; the DCDC power module converts the input side DC voltage into a DC voltage that meets the charging requirements according to the matched power characteristic value. The system has a compact structure and strong heat dissipation capability, can efficiently utilize new energy for power generation, solves problems such as photovoltaic nearby consumption, heavy load in the substation area, reverse heavy overload in the substation area, three-phase imbalance, overvoltage and peak-valley load difference of the power grid, and avoids energy loss caused by AC / DC conversion.

Description

Technical Field

[0001] The present disclosure relates to the field of photovoltaic storage and charging technology, and in particular to a storage and charging system based on an AC / DC hybrid bus architecture and a working method thereof. Background Art

[0002] At present, electric vehicles have been developed rapidly. The charging behavior of a large number of electric vehicles will have an adverse impact on the safety, stability, economy, efficiency and other aspects of the power grid. In addition, when the power grid fails and cannot charge electric vehicles, it will also affect the use of electric vehicles, and then affect the travel of users. Therefore, it is considered to combine DC charging piles with energy storage systems to form a storage and charging system to charge electric vehicles. At present, the batteries in the storage and charging system can only charge the charger and cannot be discharged as a separate energy storage device. It still has limitations in application and cannot efficiently use new energy for power generation. Summary of the invention

[0003] The present disclosure provides a storage and charging system based on an AC / DC hybrid busbar architecture, and a working method, device, and storage medium thereof.

[0004] According to a first aspect of the present disclosure, a method for operating a storage and charging system based on an AC / DC hybrid busbar architecture is provided. The method comprises:

[0005] The DC charger module obtains the charging demand of the new energy vehicle and transmits it to the energy management module; wherein the charging demand includes a charging power characteristic value;

[0006] The energy management module receives the charging demand and controls the electric energy storage module or the AC / DC conversion module to charge the DC charger module by controlling the two switches in the grid-connected module according to the photovoltaic power generation situation and the monitored storage and charging system parameters, so that the storage and charging system can meet the charging demand of new energy vehicles at any time; the storage and charging system parameters include photovoltaic reverse grid power, grid connection point voltage, electric energy storage module charging and discharging power, DC charger module charging power, and load demand power on the low-voltage side of the substation;

[0007] When the electric energy storage module or the AC / DC conversion module charges the DC charger module, the AC / DC conversion module obtains the power characteristic value of the DCDC power module in the DC charger module and matches it with the charging power characteristic value of the new energy vehicle;

[0008] The DCDC power module converts the high-voltage DC voltage on the input side into a low-voltage DC voltage that meets the requirements of new energy vehicles according to the matched power characteristic value, and then charges the new energy vehicles.

[0009] In some implementations of the first aspect, the energy management module controls the energy storage module or the AC / DC conversion module to charge the DC charger module by controlling two switches in the grid-connected module according to the photovoltaic power generation situation and the monitored storage and charging system parameters, including:

[0010] When the DC charger module needs to be charged, the energy management module controls switch No. 1 to close and switch No. 2 to open. During the photovoltaic power generation period, the energy management module controls the electric energy storage module or the AC-DC conversion module to charge the DC charger module according to the monitored photovoltaic reverse grid power and the discharge power of the electric energy storage module. During the photovoltaic power generation period, the energy management module controls the AC-DC conversion module to charge the DC charger. During the period without photovoltaic power generation, the energy management module controls the electric energy storage module or the AC-DC conversion module to charge the DC charger module according to the discharge power of the electric energy storage module and the charging power of the DC charger module.

[0011] In some implementations of the first aspect, before the energy management module controls switch No. 1 to be turned off and switch No. 2 to be turned on, the steps include:

[0012] The energy management module controls the switch No. 1 in the grid-connected module to open and the switch No. 2 to close. During the photovoltaic power generation period, the electric energy storage module is charged through the AC bus. During the photovoltaic power generation period, if the photovoltaic reverse grid power is greater than the preset power, the electric energy storage module is charged according to the minimum power between the photovoltaic reverse grid power and the charging power of the electric energy storage module. During the period without photovoltaic power generation, the electric energy storage module is discharged according to the minimum power between the load demand power on the low-voltage side of the substation and the discharge power of the electric energy storage module until the preset cut-off condition is reached.

[0013] In some implementations of the first aspect, the energy management module controls the electric energy storage module or the AC / DC conversion module to charge the DC charger module according to the monitored photovoltaic reverse grid power and the discharge power of the electric energy storage module, including:

[0014] If the photovoltaic reverse grid power is greater than zero, the energy management module controls the AC-DC conversion module to charge the DC charger module;

[0015] If the photovoltaic reverse grid power is equal to zero, the discharge power of the electric energy storage module is compared with the charging power of the DC charger module;

[0016] If the discharge power of the electric energy storage module is greater than or equal to the charging power of the DC charger module, the energy management module controls the electric energy storage module to charge the DC charger module; otherwise, the energy management module controls the AC / DC conversion module to charge the DC charger module.

[0017] In some implementations of the first aspect, the energy management module controls the electric energy storage module or the AC / DC conversion module to charge the DC charger module according to the discharge power of the electric energy storage module and the charging power of the DC charger module, including:

[0018] If the discharge power of the electric energy storage module is greater than or equal to the charging power of the DC charger module, the energy management module controls the electric energy storage module to charge the DC charger module; otherwise, the energy management module controls the AC / DC conversion module to charge the DC charger module.

[0019] In some implementations of the first aspect, the method further includes:

[0020] During the peak hours of electricity prices or when photovoltaic power generation is high, the energy management module monitors the three-phase current of the AC bus in real time and adjusts the three-phase charging power to make the three-phase current of the AC bus equal;

[0021] During peak electricity price periods, the energy management module monitors the three-phase current of the AC bus in real time and adjusts the three-phase discharge power to make the three-phase current of the AC bus equal.

[0022] In some implementations of the first aspect, the method further includes:

[0023] The energy management module monitors the grid connection point voltage in real time. When the grid connection point voltage is greater than the preset voltage, the energy management module controls switch No. 1 to open and switch No. 2 to close, and controls the electric energy storage module to charge according to the charging power of the electric energy storage module;

[0024] The energy management module monitors the three-phase reactive power of the AC bus in real time, and controls the AC / DC conversion module to send reactive power to one phase that is greater than the preset reactive power.

[0025] In some implementations of the first aspect, the method further includes:

[0026] The energy management module controls the off-grid power of switch No. 2 and the on-grid power of switch No. 1 according to the monitored charging and discharging capacity of the electric energy storage module, so that the on-grid power of the storage and charging system through switch No. 1 is consistent with the off-grid power within a metering cycle.

[0027] According to a second aspect of the present disclosure, a storage and charging system based on an AC / DC hybrid busbar architecture is provided. The system comprises:

[0028] The energy management module is respectively connected to the DC charger module, the grid connection module, the electric energy storage module and the AC / DC conversion module; wherein;

[0029] The grid-connected module is connected to the electric energy storage module and the DC charger module respectively through the AC / DC conversion module;

[0030] The energy management module is used to receive charging demands and, according to the photovoltaic power generation situation and the monitored storage and charging system parameters, control the electric energy storage module or the AC / DC conversion module to charge the DC charger module by controlling the two switches in the grid-connected module; wherein the storage and charging system parameters include photovoltaic reverse grid power, grid connection point voltage, electric energy storage module charging and discharging power, DC charger module charging power, and load demand power on the low-voltage side of the substation;

[0031] The DC charger module is used to obtain the charging requirements of new energy vehicles and transmit them to the energy management module;

[0032] The grid-connected module is used to adjust the states of the two switches contained therein according to the control conditions of the two switches contained therein by the energy management module;

[0033] The electric energy storage module is used to charge the DC charger module;

[0034] The AC / DC conversion module is used to charge the DC charger, and is also used to obtain the power characteristic value of the DCDC power module in the DC charger module and match it with the charging power characteristic value of the new energy vehicle; wherein, the DCDC power module is used to convert the high-voltage DC voltage on the input side into a low-voltage DC voltage that meets the requirements of the new energy vehicle according to the matched power characteristic value, and then charge the new energy vehicle.

[0035] According to a third aspect of the present disclosure, an electronic device is provided. The electronic device includes: at least one processor; and a memory connected to the at least one processor in communication; the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can perform the method described above.

[0036] According to a fourth aspect of the present disclosure, a non-transitory computer-readable storage medium storing computer instructions is provided, where the computer instructions are used to cause a computer to execute the method as described above.

[0037] In the present disclosure, a DC charger module obtains the charging demand of a new energy vehicle and transmits it to an energy management module; wherein the charging demand includes a charging power characteristic value; the energy management module receives the charging demand and controls the electric energy storage module or the AC / DC conversion module to charge the DC charger module according to the photovoltaic power generation situation and the monitored storage and charging system parameters by controlling the two switches in the grid-connected module, so that the storage and charging system at any time period can meet the charging demand of the new energy vehicle; wherein the storage and charging system parameters include photovoltaic reverse grid power, grid connection point voltage, electric energy storage module charging and discharging power, DC charger module charging power, and load demand power on the low-voltage side of the substation; when the electric energy storage module or the AC / DC conversion module charges the DC charger module, the AC / DC conversion module obtains the power characteristic value of the DCDC power module in the DC charger module and matches it with the charging power characteristic value of the new energy vehicle; the DCDC power module converts the high-voltage DC voltage on the input side into a low-voltage DC voltage that meets the needs of the new energy vehicle according to the matched power characteristic value, and then charges the new energy vehicle. The system uses the energy management module to achieve efficient use of renewable energy for power generation, charge new energy vehicles when the power grid is out of power, and consume distributed photovoltaics nearby, reducing the load on the substation and solving problems such as reverse overload, three-phase imbalance, overvoltage and reducing the peak-to-valley load difference of the power grid. The DCDC power module of the DC charging pile is directly connected to the DC side of the energy storage module, and the battery DC power is directly used for the DC charger, avoiding energy loss caused by AC-DC conversion. The DC charging pile is combined with the energy storage system to form an integrated storage and charging system, which is convenient for installation and maintenance. The integrated storage and charging system adopts good heat dissipation design and compact space structure design, which saves installation space and reduces equipment costs.

[0038] It should be understood that the contents described in the summary of the invention are not intended to limit the key or important features of the embodiments of the present disclosure, nor are they intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. The accompanying drawings are used to better understand the present solution and do not constitute a limitation of the present disclosure. In the accompanying drawings, the same or similar reference numerals represent the same or similar elements, among which:

[0040] Figure 1 A flow chart of a storage and charging system working method based on an AC / DC hybrid busbar architecture provided by an embodiment of the present disclosure is shown;

[0041] Figure 2 A structural principle diagram of a storage and charging system based on an AC / DC hybrid busbar architecture provided by an embodiment of the present disclosure is shown;

[0042] Figure 3 A physical diagram of a storage and charging system based on an AC / DC hybrid busbar architecture provided by an embodiment of the present disclosure is shown;

[0043] Figure 4 A block diagram of an exemplary electronic device capable of implementing an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0045] In addition, the term "and / or" in this article is only a description of the association relationship between the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0046] In response to the problems in the background technology, the embodiment of the present disclosure provides a storage and charging system based on an AC / DC hybrid busbar architecture and a working method thereof. Specifically, the DC charger module obtains the charging demand of the new energy vehicle and transmits it to the energy management module; wherein the charging demand includes a charging power characteristic value; the energy management module receives the charging demand and controls the two switches in the grid-connected module to charge the DC charger module according to the photovoltaic power generation situation and the monitored storage and charging system parameters, so that the storage and charging system at any time period can meet the charging demand of the new energy vehicle; wherein the storage and charging system parameters include photovoltaic reverse grid power, grid connection point voltage, energy storage module charging and discharging power, DC charger module charging power, and load demand power on the low-voltage side of the substation; when the energy storage module or AC / DC conversion module charges the DC charger module, the AC / DC conversion module obtains the power characteristic value of the DCDC power module in the DC charger module and matches it with the charging power characteristic value of the new energy vehicle; the DCDC power module converts the high-voltage DC voltage on the input side into a low-voltage DC voltage that meets the needs of the new energy vehicle according to the matched power characteristic value, and then charges the new energy vehicle. The system uses the energy management module to achieve efficient use of renewable energy for power generation, charge new energy vehicles when the power grid is out of power, and consume distributed photovoltaics nearby, reducing the load on the substation and solving problems such as reverse overload, three-phase imbalance, overvoltage and reducing the peak-to-valley load difference of the power grid. The DCDC power module of the DC charging pile is directly connected to the DC side of the energy storage module, and the battery DC power is directly used for the DC charger, avoiding energy loss caused by AC-DC conversion. The DC charging pile is combined with the energy storage system to form an integrated storage and charging system, which is convenient for installation and maintenance. The integrated storage and charging system adopts good heat dissipation design and compact space structure design, which saves installation space and reduces equipment costs.

[0047] In conjunction with the accompanying drawings, the storage and charging system based on the AC / DC hybrid bus architecture and the working method thereof provided by the embodiments of the present disclosure are described in detail through specific embodiments.

[0048] Figure 1 A flow chart of a storage and charging system working method based on an AC / DC hybrid busbar architecture provided by an embodiment of the present disclosure is shown. The method 100 includes the following steps:

[0049] S110, the DC charger module obtains the charging demand of the new energy vehicle and transmits it to the energy management module; wherein the charging demand includes a charging power characteristic value.

[0050] S120, the energy management module receives the charging demand and controls the energy storage module or the AC / DC conversion module to charge the DC charger module by controlling the two switches in the grid-connected module according to the photovoltaic power generation situation and the monitored storage and charging system parameters, so that the storage and charging system can meet the charging needs of new energy vehicles at any time; wherein, the storage and charging system parameters include photovoltaic reverse grid power, grid connection point voltage, energy storage module charging and discharging power, DC charger module charging power, and load demand power on the low-voltage side of the substation.

[0051] In some embodiments, the energy management module controls the power storage module or the AC / DC conversion module to charge the DC charger module by controlling two switches in the grid-connected module according to the photovoltaic power generation situation and the monitored storage and charging system parameters, including:

[0052] When the DC charger module needs to be charged, the energy management module controls switch No. 1 to close and switch No. 2 to open. During the photovoltaic power generation period, the energy management module controls the electric energy storage module or the AC-DC conversion module to charge the DC charger module according to the monitored photovoltaic reverse grid power and the discharge power of the electric energy storage module. During the photovoltaic power generation period, the energy management module controls the AC-DC conversion module to charge the DC charger. During the period without photovoltaic power generation, the energy management module controls the electric energy storage module or the AC-DC conversion module to charge the DC charger module according to the discharge power of the electric energy storage module and the charging power of the DC charger module.

[0053] In some embodiments, before the energy management module controls switch No. 1 to be turned off and switch No. 2 to be turned on, the energy management module includes:

[0054] The energy management module controls the switch No. 1 in the grid-connected module to open and the switch No. 2 to close. During the photovoltaic power generation period, the electric energy storage module is charged through the AC bus. During the photovoltaic power generation period, if the photovoltaic reverse grid power is greater than the preset power, the electric energy storage module is charged according to the minimum power between the photovoltaic reverse grid power and the charging power of the electric energy storage module. During the period without photovoltaic power generation, the electric energy storage module is discharged according to the minimum power between the load demand power on the low-voltage side of the substation and the discharge power of the electric energy storage module until the preset cut-off condition is reached.

[0055] In some embodiments, during periods of high photovoltaic power generation and periods without photovoltaic power generation, the energy management module controls the charging of the DC charger module and the charging and discharging process of the electric energy storage module to realize the local consumption of distributed photovoltaic power.

[0056] In some embodiments, the energy management module controls the electric energy storage module or the AC / DC conversion module to charge the DC charger module according to the monitored photovoltaic reverse grid power and the discharge power of the electric energy storage module, including:

[0057] If the photovoltaic reverse grid power is greater than zero, the energy management module controls the AC-DC conversion module to charge the DC charger module, that is, controls the charging power of the DC charger module to be equal to the output power of the AC-DC conversion module;

[0058] If the photovoltaic reverse grid power is equal to zero, the discharge power of the electric energy storage module is compared with the charging power of the DC charger module;

[0059] If the discharge power of the electric energy storage module is greater than or equal to the charging power of the DC charger module, the energy management module controls the electric energy storage module to charge the DC charger module; otherwise, the energy management module controls the AC / DC conversion module to charge the DC charger module.

[0060] In some embodiments, the energy management module controls the energy storage module or the AC / DC conversion module to charge the DC charger module according to the discharge power of the energy storage module and the charging power of the DC charger module, including:

[0061] If the discharge power of the electric energy storage module is greater than or equal to the charging power of the DC charger module, the energy management module controls the electric energy storage module to charge the DC charger module; otherwise, the energy management module controls the AC / DC conversion module to charge the DC charger module.

[0062] In some embodiments, the energy storage module absorbs photovoltaic power or supplies power to loads on the low-voltage bus in the substation through switch No. 1, and supplies power to other modules in the storage and charging system through switch No. 2 and compensates for the energy loss generated during its own power conversion.

[0063] In some embodiments, the photovoltaic power generation period, the photovoltaic high power generation period, and the non-photovoltaic power generation period can all be set according to actual needs.

[0064] In some embodiments, the method 100 further includes:

[0065] During the peak period of electricity price or photovoltaic power generation, the energy management module monitors the three-phase current of the AC bus in real time and adjusts the three-phase charging power to make the three-phase current of the AC bus equal; specifically, assuming that the three-phase current of the AC bus is I A ,I B ,I C , if I A B C , the energy management module controls switch No. 1 to open, and supplies power to the storage and charging system from the low-voltage side of the substation through switch No. 1. At the same time, it controls the three-phase charging power of the AC / DC conversion module, so that the charging power of the corresponding phases of the AC bus A, B, and C increases in sequence, thereby making the three-phase power on the AC bus of the grid connection point equal, where the maximum charging power of each phase is less than or equal to one-third of the rated power of the AC / DC conversion module;

[0066] ​​During the peak period of electricity price, the energy management module monitors the three-phase current of the AC bus in real time and adjusts the three-phase discharge power to make the three-phase current of the AC bus equal; specifically, assuming that the three-phase current of the AC bus is I A ,I B ,I C , if I A B C , the energy management module controls switch 1 to open to supply power to the AC bus load, and at the same time controls the three-phase discharge power of the AC / DC conversion module, so that the discharge power of the corresponding phases of the AC bus A, B, and C decreases in sequence, where the maximum discharge power of each phase is less than or equal to one third of the rated power of the AC / DC conversion module.

[0067] In some embodiments, the above process of adjusting the three-phase charging power to make the three-phase current of the AC bus equal and adjusting the three-phase discharging power to make the three-phase current of the AC bus equal can achieve three-phase imbalance control.

[0068] In some embodiments, the method 100 further includes:

[0069] The energy management module monitors the grid connection point voltage in real time. When the grid connection point voltage is greater than the preset voltage, the energy management module controls switch No. 1 to open and switch No. 2 to close, and controls the energy storage module to charge according to the charging power of the energy storage module. This process can achieve overvoltage control;

[0070] The energy management module monitors the three-phase reactive power of the AC bus in real time, and controls the AC / DC conversion module to send reactive power to one phase that is greater than the preset reactive power; further, the maximum reactive power of each phase is determined by the power of the AC / DC conversion module, and this process can achieve power factor management.

[0071] In some embodiments, the method 100 further includes:

[0072] The energy management module controls the off-grid power of switch No. 2 and the on-grid power of switch No. 1 according to the monitored charging and discharging capacity of the electric energy storage module, so that the on-grid power of the storage and charging system through switch No. 1 is consistent with the off-grid power within a metering cycle; wherein;

[0073] The metering period is from 00:00 to 24:00.

[0074] S130, when the electric energy storage module or the AC / DC conversion module charges the DC charger module, the AC / DC conversion module obtains the power characteristic value of the DCDC power module in the DC charger module and matches it with the charging power characteristic value of the new energy vehicle.

[0075] ​​S140, the DCDC power module converts the high-voltage DC voltage on the input side into a low-voltage DC voltage that meets the requirements of the new energy vehicle according to the matched power characteristic value, and then charges the new energy vehicle.

[0076] According to an embodiment of the present disclosure, a DC charger module obtains the charging demand of a new energy vehicle and transmits it to an energy management module; wherein the charging demand includes a charging power characteristic value; the energy management module receives the charging demand and controls the electric energy storage module or the AC / DC conversion module to charge the DC charger module according to the photovoltaic power generation situation and the monitored storage and charging system parameters by controlling the two switches in the grid-connected module, so that the storage and charging system at any time period can meet the charging demand of the new energy vehicle; wherein the storage and charging system parameters include photovoltaic reverse grid power, grid connection point voltage, electric energy storage module charging and discharging power, DC charger module charging power, and load demand power on the low-voltage side of the substation; when the electric energy storage module or the AC / DC conversion module charges the DC charger module, the AC / DC conversion module obtains the power characteristic value of the DCDC power module in the DC charger module and matches it with the charging power characteristic value of the new energy vehicle; the DCDC power module converts the high-voltage DC voltage on the input side into a low-voltage DC voltage that meets the needs of the new energy vehicle according to the matched power characteristic value, and then charges the new energy vehicle. The system uses the energy management module to achieve efficient use of renewable energy for power generation, charge new energy vehicles when the power grid is out of power, and consume distributed photovoltaics nearby, reducing the load on the substation and solving problems such as reverse overload, three-phase imbalance, overvoltage and reducing the peak-to-valley load difference of the power grid. The DCDC power module of the DC charging pile is directly connected to the DC side of the energy storage module, and the battery DC power is directly used for the DC charger, avoiding energy loss caused by AC-DC conversion. The DC charging pile is combined with the energy storage system to form an integrated storage and charging system, which is convenient for installation and maintenance. The integrated storage and charging system adopts good heat dissipation design and compact space structure design, which saves installation space and reduces equipment costs.

[0077] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should be aware that the present disclosure is not limited by the order of the actions described, because according to the present disclosure, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily required by the present disclosure.

[0078] The above is an introduction to the method embodiment. The following is a further explanation of the scheme disclosed in the present invention through an apparatus embodiment.

[0079] Figure 2The schematic diagram of the structure of a storage and charging system based on an AC / DC hybrid busbar architecture provided by an embodiment of the present disclosure is shown. The storage and charging system 200 includes:

[0080] The energy management module 210 is respectively connected to the DC charger module 220, the grid connection module 230, the electric energy storage module 240 and the AC / DC conversion module 250; wherein;

[0081] The grid-connected module 230 is connected to the energy storage module 240 and the DC charger module 220 respectively through the AC / DC conversion module 250 .

[0082] In some embodiments, the energy management module 210 is also connected to the station area.

[0083] In some embodiments, the grid-connected module 230 includes switch No. 1 and switch No. 2, one side of switch No. 1 is connected to the AC / DC conversion module 250, and the other side is connected to the substation; one side of switch No. 2 is connected to the AC / DC conversion module 250, and the other side is connected to the substation.

[0084] In some embodiments, the energy management module 210 being connected to the grid-connected module 230 specifically means that the energy management module 210 is connected to switch No. 1 and switch No. 2 respectively.

[0085] The energy management module 210 is used to receive the charging demand sent by the DC charger module and charge the DC charger module by controlling the two switches in the grid-connected module to control the electric energy storage module or the AC / DC conversion module according to the photovoltaic power generation situation and the monitored storage and charging system parameters; wherein the storage and charging system parameters include photovoltaic reverse grid power, grid connection point voltage, electric energy storage module charging and discharging power, DC charger module charging power, and load demand power on the low-voltage side of the substation.

[0086] In some embodiments, the energy management module 210 is specifically configured to:

[0087] The energy management module controls the power storage module or the AC / DC conversion module to charge the DC charger module by controlling the two switches in the grid-connected module according to the photovoltaic power generation situation and the monitored storage and charging system parameters, including:

[0088] When the DC charger module needs to be charged, the energy management module controls switch No. 1 to close and switch No. 2 to open. During the photovoltaic power generation period, the energy management module controls the electric energy storage module or the AC-DC conversion module to charge the DC charger module according to the monitored photovoltaic reverse grid power and the discharge power of the electric energy storage module. During the photovoltaic power generation period, the energy management module controls the AC-DC conversion module to charge the DC charger. During the period without photovoltaic power generation, the energy management module controls the electric energy storage module or the AC-DC conversion module to charge the DC charger module according to the discharge power of the electric energy storage module and the charging power of the DC charger module.

[0089] In some embodiments, the energy management module 210 is further configured to:

[0090] The energy management module controls the closing of switch 1 and the opening of switch 2, including:

[0091] The energy management module controls the switch No. 1 in the grid-connected module to open and the switch No. 2 to close. During the photovoltaic power generation period, the electric energy storage module is charged through the AC bus. During the photovoltaic power generation period, if the photovoltaic reverse grid power is greater than the preset power, the electric energy storage module is charged according to the minimum power between the photovoltaic reverse grid power and the charging power of the electric energy storage module. During the period without photovoltaic power generation, the electric energy storage module is discharged according to the minimum power between the load demand power on the low-voltage side of the substation and the discharge power of the electric energy storage module until the preset cut-off condition is reached.

[0092] In some embodiments, the energy management module 210 is further configured to:

[0093] The energy management module controls the electric energy storage module or the AC / DC conversion module to charge the DC charger module according to the monitored photovoltaic reverse grid power and the discharge power of the electric energy storage module, including:

[0094] If the photovoltaic reverse grid power is greater than zero, the energy management module controls the AC-DC conversion module to charge the DC charger module;

[0095] If the photovoltaic reverse grid power is equal to zero, the discharge power of the electric energy storage module is compared with the charging power of the DC charger module;

[0096] If the discharge power of the electric energy storage module is greater than or equal to the charging power of the DC charger module, the energy management module controls the electric energy storage module to charge the DC charger module; otherwise, the energy management module controls the AC / DC conversion module to charge the DC charger module.

[0097] In some embodiments, the energy management module 210 is further configured to:

[0098] The energy management module controls the energy storage module or the AC / DC conversion module to charge the DC charger module according to the discharge power of the energy storage module and the charging power of the DC charger module, including:

[0099] If the discharge power of the electric energy storage module is greater than or equal to the charging power of the DC charger module, the energy management module controls the electric energy storage module to charge the DC charger module; otherwise, the energy management module controls the AC / DC conversion module to charge the DC charger module.

[0100] The DC charger module 220 is used to obtain the charging demand of the new energy vehicle and transmit it to the energy management module.

[0101] The grid-connected module 230 is used to adjust the states of the two switches contained therein according to the control conditions of the two switches controlled by the energy management module.

[0102] The electric energy storage module 240 is used to charge the DC charger module.

[0103] The AC / DC conversion module 250 is used to charge the DC charger, and is also used to obtain the power characteristic value of the DCDC power module in the DC charger module and match it with the charging power characteristic value of the new energy vehicle; wherein the DCDC power module is used to convert the high-voltage DC voltage on the input side into a low-voltage DC voltage that meets the requirements of the new energy vehicle according to the matched power characteristic value, and then charge the new energy vehicle.

[0104] In some embodiments, the storage and charging system 200 is further used for:

[0105] During the peak hours of electricity prices or when photovoltaic power generation is high, the energy management module monitors the three-phase current of the AC bus in real time and adjusts the three-phase charging power to make the three-phase current of the AC bus equal;

[0106] During peak electricity price periods, the energy management module monitors the three-phase current of the AC bus in real time and adjusts the three-phase discharge power to make the three-phase current of the AC bus equal.

[0107] In some embodiments, the storage and charging system 200 is further used for:

[0108] The energy management module monitors the grid connection point voltage in real time. When the grid connection point voltage is greater than the preset voltage, the energy management module controls switch No. 1 to open and switch No. 2 to close, and controls the electric energy storage module to charge according to the charging power of the electric energy storage module;

[0109] The energy management module monitors the three-phase reactive power of the AC bus in real time, and controls the AC / DC conversion module to send reactive power to one phase that is greater than the preset reactive power.

[0110] In some embodiments, the storage and charging system 200 is further used for:

[0111] The energy management module controls the off-grid power of switch No. 2 and the on-grid power of switch No. 1 according to the monitored charging and discharging capacity of the electric energy storage module, so that the on-grid power of the storage and charging system through switch No. 1 is consistent with the off-grid power within a metering cycle.

[0112] Understandably, Figure 2 Each module / unit in the storage and charging system 200 shown has the function of implementing each step in the method 100 provided in the embodiment of the present disclosure and can achieve its corresponding technical effect. For the sake of brevity, it will not be repeated here.

[0113] Figure 3A physical diagram of a storage and charging system based on an AC / DC hybrid busbar architecture provided by an embodiment of the present disclosure is shown. As shown in the figure, the storage and charging system 200 mainly includes an electric energy storage module 240, a grid connection module 230, an energy management module 210, a DC charger module 220 and an AC / DC conversion module 250, and the auxiliary equipment also includes a DC connection device 260 and a high-voltage connection module 270;

[0114] The electric energy storage module 240 is located at the upper left of the storage and charging system 200, the grid-connected module 230 is located below the electric energy storage module 240, the energy management module 210 is located above the middle side of the storage and charging system, the AC / DC conversion module 250 is located below the energy management module 210, the DC charger module 220 is located above the right side of the storage and charging system, and the intelligent control module 221, the DCDC power module 223 and the charging gun 225 are sequentially arranged from top to bottom, and the high-voltage connection module 270 is located below the DC charger module 220, that is, the lower right side of the storage and charging system; one side of the DC connection device 260 is connected to the electric energy storage module 240, and the other side is sequentially connected to the input end of the DCDC power module 223 in the AC / DC conversion module 250 and the high-voltage connection module 270; the DC side of the AC / DC conversion module 250 is connected to the DC charger module 220 and the electric energy storage module 240, and the AC side is connected to the grid-connected module 230;

[0115] Furthermore, the DC charger module 220 includes a DCDC power module 223, an intelligent control module 221, a charging gun 225, a metering module and a charging cable; the energy management module 210 includes a monitoring module, a charging energy control module, a discharging energy control module, and an energy balance module; the grid connection module 230 includes a DC connection device 260;

[0116] Among them, the intelligent control module 221 is used to obtain the charging demand of the new energy vehicle;

[0117] The monitoring module is used to monitor the photovoltaic reverse grid power, grid connection point voltage, energy storage module charging and discharging power, DC charger module charging power, and low-voltage side load demand power in real time;

[0118] The charging energy control module is used to control the charging of the electric energy storage module and the DC charger module according to the method 100;

[0119] The discharge energy control module is used to control the discharge of the electric energy storage module according to the method 100;

[0120] The energy balance module is used to control the online power and offline power of the storage and charging system through switch No. 1 in a metering cycle;

[0121] Furthermore, the storage and charging system is an independent closed structure with a built-in thermal management system, which can perform separate thermal management on the electric energy storage module, which is conducive to improving the thermal management accuracy and reducing the thermal management energy consumption;

[0122] The AC / DC conversion module is also equipped with a dedicated thermal management unit, which can increase the heat dissipation efficiency of the AC / DC conversion module and reduce energy consumption;

[0123] A heat insulation layer is provided between the electric energy storage module and the AC / DC conversion module to avoid heat transfer between the two modules. A heat insulation layer is also provided between the DC charger module and the AC / DC conversion module.

[0124] Figure 4 A block diagram of an exemplary electronic device capable of implementing an embodiment of the present disclosure is shown. Electronic device 400 is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. Electronic device 400 may also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present disclosure described and / or required herein.

[0125] like Figure 4 As shown, the electronic device 400 includes a computing unit 401, which can perform various appropriate actions and processes according to a computer program stored in a ROM 402 or a computer program loaded from a storage unit 408 into a RAM 403. In the RAM 403, various programs and data required for the operation of the electronic device 400 can also be stored. The computing unit 401, the ROM 402, and the RAM 403 are connected to each other via a bus 404. An I / O interface 405 is also connected to the bus 404.

[0126] Multiple components in the electronic device 400 are connected to the I / O interface 405, including: an input unit 406, such as a keyboard, a mouse, etc.; an output unit 407, such as various types of displays, speakers, etc.; a storage unit 408, such as a disk, an optical disk, etc.; and a communication unit 409, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 409 allows the electronic device 400 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0127] The computing unit 401 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the computing unit 401 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various computing units running machine learning model algorithms, digital signal processors (DSPs), and any appropriate processors, controllers, microcontrollers, etc. The computing unit 401 performs the various methods and processes described above, such as method 100. For example, in some embodiments, the method 100 may be implemented as a computer software program, which is tangibly contained in a machine-readable medium, such as a storage unit 408. In some embodiments, part or all of the computer program may be loaded and / or installed on the electronic device 400 via the ROM 402 and / or the communication unit 409. When the computer program is loaded into the RAM 403 and executed by the computing unit 401, one or more steps of the method 100 described above may be performed. Alternatively, in other embodiments, the computing unit 401 may be configured to perform the method 100 in any other appropriate manner (e.g., by means of firmware).

[0128] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0129] The program code for implementing the method of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that the program code, when executed by the processor or controller, enables the functions / operations specified in the flow chart and / or block diagram to be implemented. The program code may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0130] In the context of the present disclosure, a machine-readable medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, device, or equipment. A machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or device, or any suitable combination of the foregoing. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0131] It should be noted that the present disclosure also provides a non-transitory computer-readable storage medium storing computer instructions, wherein the computer instructions are used to enable a computer to execute method 100 and achieve the corresponding technical effect achieved by executing the method in the embodiment of the present disclosure. For the sake of concise description, they are not repeated here.

[0132] To provide interaction with a user, the systems and techniques described herein can be implemented on a computer having: a display device for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or trackball) through which the user can provide input to the computer. Other types of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0133] The systems and techniques described herein may be implemented in a computing system that includes back-end components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes front-end components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such back-end components, middleware components, or front-end components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), and the Internet.

[0134] A computer system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The relationship of client and server is generated by computer programs running on respective computers and having a client-server relationship with each other. The server may be a cloud server, a server of a distributed system, or a server combined with a blockchain.

[0135] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this disclosure can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solutions disclosed in this disclosure can be achieved, and this document does not limit this.

[0136] The above specific implementations do not constitute a limitation on the protection scope of the present disclosure. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A storage and charging system working method based on an AC / DC hybrid busbar architecture, characterized in that: include: The storage and charging system includes an energy management module which is respectively connected to a DC charger module, a grid-connected module, an electric energy storage module and an AC / DC conversion module. The grid-connected module is respectively connected to the electric energy storage module and the DC charger module through the AC / DC conversion module. The energy management module is also connected to the substation. The grid-connected module includes a switch No. 1 and a switch No.

2. One side of the switch No. 1 is connected to the AC / DC conversion module and the other side is connected to the substation. One side of the switch No. 2 is connected to the AC / DC conversion module and the other side is connected to the substation. When the storage and charging system is working, the DC charger module obtains the charging demand of the new energy vehicle and transmits it to the energy management module; wherein the charging demand includes the charging power characteristic value; The energy management module receives the charging demand, controls switch No. 1 in the grid-connected module to open and switch No. 2 to close, charges the electric energy storage module through the AC bus during the photovoltaic power generation period, and controls the electric energy storage module to charge according to the smallest power between the photovoltaic reverse grid power and the charging power of the electric energy storage module during the photovoltaic power generation period. During the period without photovoltaic power generation, controls the electric energy storage module to discharge according to the smallest power between the load demand power on the low-voltage side of the substation and the discharge power of the electric energy storage module until the preset cut-off condition is reached; when the DC charger module needs to be charged, the energy management module The block controls switch No. 1 to be closed and switch No. 2 to be opened. During the photovoltaic power generation period, the energy management module controls the electric energy storage module or the AC / DC conversion module to charge the DC charger module according to the monitored photovoltaic reverse grid power and the discharge power of the electric energy storage module. During the photovoltaic power generation period, the energy management module controls the AC / DC conversion module to charge the DC charger. During the period without photovoltaic power generation, the energy management module controls the electric energy storage module or the AC / DC conversion module to charge the DC charger module according to the discharge power of the electric energy storage module and the charging power of the DC charger module, so that the storage and charging system at any time can meet the charging needs of new energy vehicles; When the electric energy storage module or the AC / DC conversion module charges the DC charger module, the AC / DC conversion module obtains the power characteristic value of the DCDC power module in the DC charger module and matches it with the charging power characteristic value of the new energy vehicle; The DCDC power module converts the high-voltage DC voltage on the input side into a low-voltage DC voltage that meets the requirements of new energy vehicles according to the matched power characteristic value, and then charges the new energy vehicles.

2. The method according to claim 1, characterized in that The energy management module controls the electric energy storage module or the AC / DC conversion module to charge the DC charger module according to the monitored photovoltaic reverse grid power and the discharge power of the electric energy storage module, including: If the photovoltaic reverse grid power is greater than zero, the energy management module controls the AC-DC conversion module to charge the DC charger module; If the photovoltaic reverse grid power is equal to zero, the discharge power of the electric energy storage module is compared with the charging power of the DC charger module; If the discharge power of the electric energy storage module is greater than or equal to the charging power of the DC charger module, the energy management module controls the electric energy storage module to charge the DC charger module; otherwise, the energy management module controls the AC / DC conversion module to charge the DC charger module.

3. The method according to claim 1, characterized in that The energy management module controls the electric energy storage module or the AC / DC conversion module to charge the DC charger module according to the discharge power of the electric energy storage module and the charging power of the DC charger module, including: If the discharge power of the electric energy storage module is greater than or equal to the charging power of the DC charger module, the energy management module controls the electric energy storage module to charge the DC charger module; otherwise, the energy management module controls the AC / DC conversion module to charge the DC charger module.

4. The method according to claim 1, characterized in that The method further comprises: During the peak hours of electricity prices or when photovoltaic power generation is high, the energy management module monitors the three-phase current of the AC bus in real time and adjusts the three-phase charging power to make the three-phase current of the AC bus equal; During peak electricity price periods, the energy management module monitors the three-phase current of the AC bus in real time and adjusts the three-phase discharge power to make the three-phase current of the AC bus equal.

5. The method according to claim 1, characterized in that The method further comprises: The energy management module monitors the grid connection point voltage in real time. When the grid connection point voltage is greater than the preset voltage, the energy management module controls switch No. 1 to open and switch No. 2 to close, and controls the electric energy storage module to charge according to the charging power of the electric energy storage module; The energy management module monitors the three-phase reactive power of the AC bus in real time, and controls the AC / DC conversion module to send reactive power to one phase that is greater than the preset reactive power.

6. The method according to claim 1, characterized in that The method further comprises: The energy management module controls the off-grid power of switch No. 2 and the on-grid power of switch No. 1 according to the monitored charging and discharging capacity of the electric energy storage module, so that the on-grid power of the storage and charging system through switch No. 1 is consistent with the off-grid power within a metering cycle.

7. A storage and charging system based on an AC / DC hybrid busbar architecture, characterized in that: include: The energy management module is respectively connected to the DC charger module, the grid-connected module, the electric energy storage module and the AC / DC conversion module. The grid-connected module is respectively connected to the electric energy storage module and the DC charger module through the AC / DC conversion module. The energy management module is also connected to the substation. The grid-connected module includes a switch No. 1 and a switch No.

2. One side of the switch No. 1 is connected to the AC / DC conversion module and the other side is connected to the substation. One side of the switch No. 2 is connected to the AC / DC conversion module and the other side is connected to the substation. The DC charger module is used to obtain the charging requirements of new energy vehicles and transmit them to the energy management module; The energy management module is used to receive the charging demand, control the switch No. 1 in the grid-connected module to open and the switch No. 2 to close, charge the electric energy storage module through the AC bus during the photovoltaic power generation period, and during the photovoltaic power generation period, if the photovoltaic reverse grid power is greater than the preset power, control the electric energy storage module to charge according to the smallest power between the photovoltaic reverse grid power and the charging power of the electric energy storage module. During the period without photovoltaic power generation, control the electric energy storage module to discharge according to the smallest power between the load demand power on the low-voltage side of the substation and the discharge power of the electric energy storage module until the preset cut-off condition is reached; The energy management module is also used to control switch No. 1 to close and switch No. 2 to open when the DC charger module needs to be charged. During the photovoltaic power generation period, the power storage module or AC-DC conversion module is controlled to charge the DC charger module according to the monitored photovoltaic reverse grid power and the discharge power of the power storage module. During the photovoltaic power generation period, the AC-DC conversion module is controlled to charge the DC charger. During the period without photovoltaic power generation, the power storage module or AC-DC conversion module is controlled to charge the DC charger module according to the discharge power of the power storage module and the charging power of the DC charger module, so that the storage and charging system at any time can meet the charging needs of new energy vehicles. The grid-connected module is used to adjust the states of switch No. 1 and switch No. 2 according to the control of switch No. 1 and switch No. 2 by the energy management module; The electric energy storage module is used to charge the DC charger module; it is also used to charge through the AC bus during the photovoltaic power generation period when switch No. 1 is turned on and switch No. 2 is turned off. During the photovoltaic power generation period, when the photovoltaic reverse grid power is greater than the preset power, charging is performed according to the minimum power between the photovoltaic reverse grid power and the charging power of the electric energy storage module; The AC / DC conversion module is used to charge the DC charger, and is also used to obtain the power characteristic value of the DCDC power module in the DC charger module and match it with the charging power characteristic value of the new energy vehicle; wherein, the DCDC power module is used to convert the high-voltage DC voltage on the input side into a low-voltage DC voltage that meets the requirements of the new energy vehicle according to the matched power characteristic value, and then charge the new energy vehicle.

8. An electronic device, characterized in that: include: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the method of any one of claims 1 to 6.

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