Site energy processing method and device, power supply system and storage medium

Abstract

The invention provides a station energy processing method and device, a power supply system and a storage medium, and relates to the energy management technology, and the method comprises the steps: monitoring the actual charging and discharging current values of a plurality of batteries, and obtaining the actual charging and discharging current values; acquiring preset charge and discharge rates of the plurality of batteries; determining a charge-discharge processing mode based on a preset charge-discharge rate and the actual charge-discharge current value; and according to the charging and discharging processing mode, performing charging and discharging control on the plurality of batteries, and adjusting output voltages and output currents of other power supply modes except battery power supply. According to the method, more effective comprehensive management of station energy is realized through the charging and discharging processing mode in a battery mixed use scene, so that green energy and differentiated energy storage capability of different batteries of the station can be more fully utilized, and on the premise of ensuring the power supply reliability of the station, the power supply reliability of the station is improved. The technical problems that the charging and discharging management of the battery is not fine enough and the energy storage capacity of the station battery is not fully utilized in the existing station energy management technology are solved.

Description

Technical Field

[0001] The present application relates to energy management technology, and in particular to a site energy processing method, device, power supply system and storage medium. Background Art

[0002] At present, with the maturity of lithium battery technology, peak shaving and valley filling, photovoltaic stacking and other functions are generally introduced in site construction. Among them, photovoltaic stacking refers to the introduction of green energy, that is, the use of photovoltaic energy for power supply, which reduces the use of traditional carbon energy. The existing batteries in the site are mainly lead-acid batteries. With the application of lithium batteries, the sites have seen the mixed use of batteries of different types, capacities, periods and manufacturers in parallel. Therefore, it is necessary to manage the mixed batteries in detail.

[0003] In the prior art, problems caused by mixing different batteries are usually handled through independent battery sharing managers or intelligent lithium battery solutions. The core principle is to avoid overcurrent and protection risks caused by large differences between different batteries by independently controlling the charge and discharge current and voltage of each battery. At the same time, on this basis, this solution can also realize the intelligent energy management function of peak load shaving and valley filling, controlling battery discharge during peak electricity price periods and controlling battery charging during valley electricity price periods.

[0004] However, the existing charging and discharging processing methods are not organically combined with the energy management technology of the power monitoring unit, resulting in the failure to make fuller use of green energy and the differentiated energy storage capabilities of different batteries at the site. The battery charging and discharging management is not sophisticated enough, resulting in the failure to fully utilize the energy storage capacity of the site battery and the inability to achieve the goal of maximizing benefits. Summary of the invention

[0005] The present application provides a site energy processing method, device, power supply system and storage medium to solve the technical problem that the existing site energy management technology is not sophisticated enough in the charge and discharge management of the battery and fails to fully utilize the energy storage capacity of the site battery.

[0006] In a first aspect, the present application provides a site energy processing method, which is applied to a power supply system deployed in a site, wherein the power supply system is deployed with a plurality of batteries; the method comprises:

[0007] Monitor the actual charge and discharge current values ​​of the multiple batteries to obtain the actual charge and discharge current values; and obtain the preset charge and discharge rates of the multiple batteries;

[0008] Determine a charge and discharge processing mode based on the preset charge and discharge ratio and the actual charge and discharge current value; wherein the charge and discharge processing mode is used to indicate charge and discharge rule information;

[0009] According to the charge and discharge processing mode, the charge and discharge of the plurality of batteries are controlled, and the output voltage and output current of other power supply modes except battery power supply are adjusted.

[0010] Further, the determining of the charge and discharge processing mode based on the preset charge and discharge rate and the actual charge and discharge current value includes:

[0011] Based on the actual charge and discharge current value, if it is determined that the preset charge and discharge rate is greater than a preset threshold value, then determining that the charge and discharge processing mode corresponding to the preset charge and discharge rate is a charging mode;

[0012] If it is determined that the preset charge-discharge ratio is less than a preset threshold value, then determining that the charge-discharge processing mode corresponding to the preset charge-discharge ratio is a discharge mode;

[0013] If it is determined that the preset charge and discharge ratio is equal to the preset threshold value, the charge and discharge processing mode corresponding to the preset charge and discharge ratio is determined to be a non-charge and non-discharge mode.

[0014] Furthermore, the power supply system is also deployed with multiple photovoltaic devices, multiple rectifier devices and multiple bidirectional DCDC devices; the battery includes an internal battery and an external battery; wherein each of the bidirectional DCDC devices is connected in series with a built-in battery; multiple external batteries are in a parallel structure; each of the bidirectional DCDC devices is connected in parallel with multiple external batteries.

[0015] Furthermore, the charging and discharging of the plurality of batteries is controlled according to the charging and discharging processing mode, and the output voltage and output current of other power supply modes other than battery power supply are adjusted, including:

[0016] If it is determined that the charge and discharge processing mode is the charging mode, then for each external battery, the output voltage of the photovoltaic device is adjusted to a preset photovoltaic equalizing charging voltage setting value, and the output voltage of the rectifier device is adjusted to a rectifier equalizing charging voltage setting value; wherein, in the charging mode, the actual charge and discharge current value is the actual battery charging current;

[0017] Based on the photovoltaic equalizing charging voltage setting value and the rectifier equalizing charging voltage setting value, determine a first difference between the actual battery charging current of the plurality of batteries and a preset battery charging rate current; and adjust the output current of the photovoltaic device and the rectifier device based on the first difference so that the actual battery charging current is close to the preset battery charging rate current;

[0018] For each built-in battery, the built-in battery is charged differentially according to the charging voltage of the built-in battery and a preset charging current limit.

[0019] Furthermore, the charging and discharging of the plurality of batteries is controlled according to the charging and discharging processing mode, and the output voltage and output current of other power supply modes other than battery power supply are adjusted, including:

[0020] If it is determined that the charge and discharge processing mode is the discharge mode, then for the plurality of batteries, the output voltage of the photovoltaic device is adjusted to a preset photovoltaic float charge voltage setting value, and the output voltage of the rectifier device is adjusted to a preset rectifier float charge voltage setting value; wherein, in the discharge mode, the actual charge and discharge current value is the actual battery discharge current;

[0021] Based on the photovoltaic float charge voltage setting value and the rectifier float charge voltage setting value, determine a second difference between the actual battery discharge current of the multiple batteries and the preset battery discharge rate current; and adjust the output current of the rectifier device based on the second difference so that the actual battery discharge current is close to the preset battery discharge rate current.

[0022] Furthermore, the method further comprises:

[0023] According to preset voltage rule information, the voltage value of the bidirectional DCDC device is determined so that the built-in battery connected in series with the bidirectional DCDC device is discharged preferentially; wherein the preset voltage rule information indicates that the voltage value of the bidirectional DCDC device must be lower than the voltage value of the photovoltaic device and higher than the voltage value of the rectifier device.

[0024] Furthermore, the charging and discharging of the plurality of batteries is controlled according to the charging and discharging processing mode, and the output voltage and output current of other power supply modes other than battery power supply are adjusted, including:

[0025] If it is determined that the charge and discharge processing mode is a non-charging and non-discharging mode, the output voltage of the photovoltaic device is adjusted to a preset photovoltaic floating charge voltage setting value, and the output voltage of the rectifier device is adjusted to a preset rectifier floating charge voltage setting value; wherein, in the non-charging and non-discharging mode, the actual charge and discharge current value is the actual battery discharge current;

[0026] Based on the photovoltaic float charge voltage setting value and the rectifier float charge voltage setting value, determine a third difference between the actual battery discharge current of the multiple batteries and the preset battery discharge rate current; and adjust the output current of the rectifier device based on the third difference so that the actual battery discharge current is close to the preset second discharge rate current.

[0027] In a second aspect, the present application provides a site energy processing device, which is applied to a power supply system deployed in a site, wherein the power supply system is deployed with a plurality of batteries; the device comprises:

[0028] A monitoring unit, used to monitor the actual charge and discharge current values ​​of the multiple batteries to obtain the actual charge and discharge current values; and obtain the preset charge and discharge rates of the multiple batteries;

[0029] A determination unit, configured to determine a charge and discharge processing mode based on the preset charge and discharge ratio and the actual charge and discharge current value; wherein the charge and discharge processing mode is used to indicate charge and discharge rule information;

[0030] The charging and discharging unit is used to control the charging and discharging of the plurality of batteries according to the charging and discharging processing mode, and to adjust the output voltage and output current of other power supply modes except battery power supply.

[0031] Furthermore, the determining unit includes:

[0032] A first determination module is used to determine, based on the actual charge and discharge current value, that the charge and discharge processing mode corresponding to the preset charge and discharge rate is a charging mode if it is determined that the preset charge and discharge rate is greater than a preset threshold value;

[0033] A second determination module, configured to determine that the charge-discharge processing mode corresponding to the preset charge-discharge ratio is a discharge mode if it is determined that the preset charge-discharge ratio is less than a preset threshold value;

[0034] The third determination module is used to determine that the charge and discharge processing mode corresponding to the preset charge and discharge ratio is a non-charge and non-discharge mode if it is determined that the preset charge and discharge ratio is equal to a preset threshold value.

[0035] Furthermore, the power supply system is also deployed with multiple photovoltaic devices, multiple rectifier devices and multiple bidirectional DCDC devices; the battery includes an internal battery and an external battery; wherein each of the bidirectional DCDC devices is connected in series with a built-in battery; multiple external batteries are in a parallel structure; each of the bidirectional DCDC devices is connected in parallel with multiple external batteries.

[0036] Furthermore, the charging and discharging unit comprises:

[0037] A first regulating module is used for regulating the output voltage of the photovoltaic device to a preset photovoltaic equalizing charging voltage setting value and regulating the output voltage of the rectifier device to a rectifier equalizing charging voltage setting value for each external battery if it is determined that the charging and discharging processing mode is a charging mode; wherein, in the charging mode, the actual charging and discharging current value is the actual battery charging current;

[0038] a second regulating module, configured to determine a first difference between the actual battery charging current of the plurality of batteries and a preset battery charging rate current based on the photovoltaic equalizing charging voltage setting value and the rectifier equalizing charging voltage setting value; and to regulate the output current of the photovoltaic device and the rectifier device based on the first difference so that the actual battery charging current is close to the preset battery charging rate current;

[0039] The charging module is used to charge each built-in battery differently according to the charging voltage of the built-in battery and a preset charging current limit.

[0040] Furthermore, the charging and discharging unit comprises:

[0041] A third regulating module is used for regulating the output voltage of the photovoltaic device to a preset photovoltaic floating charge voltage setting value and regulating the output voltage of the rectifier device to a preset rectifier floating charge voltage setting value for the multiple batteries if it is determined that the charging and discharging processing mode is a discharge mode; wherein, in the discharge mode, the actual charging and discharging current value is the actual battery discharge current;

[0042] The fourth regulating module is used to determine the second difference between the actual battery discharge current of the multiple batteries and the preset battery discharge rate current based on the photovoltaic float charge voltage setting value and the rectifier float charge voltage setting value; and adjust the output current of the rectifier device based on the second difference so that the actual battery discharge current is close to the preset battery discharge rate current.

[0043] Furthermore, the device also includes:

[0044] A determination module is used to determine the voltage value of the bidirectional DCDC device according to preset voltage rule information, so that the built-in battery connected in series with the bidirectional DCDC device is discharged preferentially; wherein the preset voltage rule information indicates that the voltage value of the bidirectional DCDC device must be lower than the voltage value of the photovoltaic device, and higher than the voltage value of the rectifier device.

[0045] Furthermore, the charging and discharging unit comprises:

[0046] A fifth regulating module, for regulating the output voltage of the photovoltaic device to a preset photovoltaic floating charge voltage setting value, and regulating the output voltage of the rectifier device to a preset rectifier floating charge voltage setting value if it is determined that the charging and discharging processing mode is a non-charging and non-discharging mode; wherein, in the non-charging and non-discharging mode, the actual charging and discharging current value is the actual battery discharge current;

[0047] The sixth regulating module is used to determine the third difference between the actual battery discharge current of the multiple batteries and the preset battery discharge rate current based on the photovoltaic float charge voltage setting value and the rectifier float charge voltage setting value; and adjust the output current of the rectifier device based on the third difference so that the actual battery discharge current is close to the preset second discharge rate current.

[0048] In a third aspect, the present application provides a power supply system, comprising a memory and a processor, wherein the memory stores a computer program executable on the processor, and the processor implements the method described in the first aspect when executing the computer program.

[0049] In a fourth aspect, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, they are used to implement the method described in the first aspect.

[0050] In a fifth aspect, the present application provides a computer program product, including a computer program, which implements the method described in the first aspect when executed by a processor.

[0051] The present application provides a site energy processing method, device, power supply system and storage medium, which monitor the actual charge and discharge current values ​​of multiple batteries to obtain the actual charge and discharge current values; and obtain the preset charge and discharge ratios of multiple batteries. Based on the preset charge and discharge ratio and the actual charge and discharge current value, the charge and discharge processing mode is determined; wherein the charge and discharge processing mode is used to indicate the charge and discharge rule information. According to the charge and discharge processing mode, the charge and discharge of multiple batteries are controlled, and the output voltage and output current of other power supply modes other than battery power supply are adjusted. In this scheme, the charge and discharge processing mode corresponding to the preset charge and discharge ratio is determined, and the multiple batteries are charged and discharged differentially according to the charge and discharge processing mode. Therefore, in the battery mixed use scenario, more effective integrated management of site energy is achieved through the charge and discharge processing mode, so that the differentiated energy storage capacity of green energy and different batteries of the site can be more fully utilized, and the benefits can be maximized under the premise of ensuring the reliability of site power supply, which solves the technical problem that the existing site energy management technology is not fine enough for the charge and discharge management of batteries and fails to fully utilize the energy storage capacity of site batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0053] Figure 1 A schematic diagram of a process flow of a site energy processing method provided in an embodiment of the present application;

[0054] Figure 2 A schematic diagram of the architecture of a site energy processing method provided in an embodiment of the present application;

[0055] Figure 3 A schematic diagram of a flow chart of another site energy processing method provided in an embodiment of the present application;

[0056] Figure 4 A schematic diagram of the structure of a site energy processing device provided in an embodiment of the present application;

[0057] Figure 5 A schematic diagram of the structure of another site energy processing device provided in an embodiment of the present application;

[0058] Figure 6 A schematic diagram of the structure of a power supply system provided in an embodiment of the present application.

[0059] The above drawings show clear embodiments of the present disclosure, which will be described in more detail below. These drawings and text descriptions are not intended to limit the scope of the present disclosure in any way, but to illustrate the concepts of the present disclosure to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0060] Here, exemplary embodiments will be described in detail, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present disclosure.

[0061] At present, with the maturity of lithium battery technology, peak shaving and valley filling, photovoltaic stacking and other functions are generally introduced in site construction. Among them, photovoltaic stacking refers to the introduction of green energy, that is, the use of photovoltaic energy for power supply, which reduces the use of traditional carbon energy. The existing batteries in the site are mainly lead-acid batteries. With the application of lithium batteries, the sites have seen the mixed use of batteries of different types, capacities, periods and manufacturers in parallel. Therefore, it is necessary to manage the mixed batteries in detail.

[0062] In one example, in the prior art, problems caused by the mixed use of different batteries are usually handled through independent battery sharing managers or intelligent lithium battery solutions. The core principle is to avoid the risk of overcurrent and protection caused by the large differences between different batteries by independently controlling the charge and discharge current and voltage of each battery. At the same time, on this basis, this solution can also realize the intelligent energy management function of peak shaving and valley filling. In the peak electricity price section, the battery discharge is controlled; in the valley electricity price section, the battery charging is controlled. However, the existing charge and discharge processing method is not organically combined with the energy management technology of the power supply monitoring unit, resulting in the failure to make fuller use of green energy and the differentiated energy storage capacity of different batteries at the site. The battery charge and discharge management is not sophisticated enough, resulting in the failure to fully utilize the energy storage capacity of the site battery and the inability to achieve the purpose of maximizing benefits.

[0063] The present application provides a site energy processing method, device, power supply system and storage medium, which are intended to solve the above technical problems in the prior art.

[0064] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0065] Figure 1 A schematic flow chart of a site energy processing method provided in an embodiment of the present application is applied to a power system deployed in a site, where the power system is deployed with multiple batteries; Figure 1 As shown, the method includes:

[0066] Step 101: monitor actual charge and discharge current values ​​of multiple batteries to obtain actual charge and discharge current values; and obtain preset charge and discharge rates of multiple batteries.

[0067] Exemplarily, the execution subject of this embodiment may be a power supply system deployed in a site, and the power supply system includes a monitoring module. Figure 2 A schematic diagram of the architecture of a site energy processing method provided in an embodiment of the present application, such as Figure 2As shown, the battery takes a storage battery as an example, including: photovoltaic equipment MPPT, rectifier equipment Rectifier, multiple bidirectional DCDC equipment, built-in batteries connected in series with each bidirectional DCDC equipment, multiple independent external batteries and loads, multiple external batteries are in parallel structure, and each bidirectional DCDC equipment is connected in parallel with multiple external batteries. Photovoltaic equipment realizes solar energy conversion and outputs DC; the rectifier equipment is powered by the mains and outputs DC to achieve complementary output to the photovoltaic equipment; the battery is connected in parallel to the DC busbar, and when the photovoltaic power is insufficient or uneconomical, the battery is in a discharge state and bears part or all of the load. When the photovoltaic power is abundant and economical, the battery is charged through the photovoltaic equipment and the rectifier equipment to replenish the battery energy in time.

[0068] In this step, the power system monitors the actual charge and discharge current values ​​of multiple batteries through its own monitoring module, obtains the actual charge and discharge current values, and obtains the preset charge and discharge rates of multiple batteries. The preset charge and discharge rate refers to the ratio of the current value required for the battery to discharge its rated capacity within a specified time. The preset charge and discharge rate here refers to the total preset charge and discharge rate of multiple batteries. It should be noted that the battery can be a storage battery, etc., without limitation.

[0069] Step 102: Determine a charge and discharge processing mode based on a preset charge and discharge ratio and an actual charge and discharge current value; wherein the charge and discharge processing mode is used to indicate charge and discharge rule information.

[0070] Exemplarily, the charge and discharge processing mode includes preset charge and discharge rule information. Based on the actual charge and discharge current value, the power supply system compares the preset charge and discharge ratio with the preset threshold value, wherein the preset threshold value is 0. If it is determined that the preset charge and discharge ratio is greater than 0, the charge and discharge processing mode corresponding to the preset charge and discharge ratio is determined to be a charging mode, and the charging mode is used to indicate the charging rule information about charging; if it is determined that the preset charge and discharge ratio is less than 0, the charge and discharge processing mode corresponding to the preset charge and discharge ratio is determined to be a discharge mode, and the discharge mode is used to indicate the discharge rule information about discharging; if it is determined that the preset charge and discharge ratio is equal to 0, the charge and discharge processing mode corresponding to the preset charge and discharge ratio is determined to be a non-charging and non-discharging mode, and the non-charging and non-discharging mode is used to indicate the rule information about non-charging and non-discharging.

[0071] Step 103: Control the charge and discharge of multiple batteries according to the charge and discharge processing mode, and adjust the output voltage and output current of other power supply modes except battery power supply.

[0072] Exemplarily, if the charge and discharge processing mode is the charge mode, the power system charges the multiple batteries according to the charge mode. If the charge and discharge processing mode is the discharge mode, the power system discharges the multiple batteries according to the discharge mode. If the charge and discharge processing mode is the non-charge and non-discharge mode, the power system does not charge and discharge the multiple batteries according to the non-charge and non-discharge mode. The power supply voltage and power supply current of other power supply modes other than battery power supply can also be adjusted in real time.

[0073] Therefore, for the mixed battery scenario, based on the characteristics of different batteries, from the system level, on the basis of the overall regulation of battery current, further distribution of battery current can be achieved to achieve more efficient use of batteries with different characteristics such as lithium batteries and lead-acid batteries, thereby achieving refined management of site energy. On the premise of ensuring the reliability of site power supply, green energy power supply is given priority to maximize benefits.

[0074] In an embodiment of the present application, the actual charge and discharge current values ​​of multiple batteries are monitored to obtain the actual charge and discharge current values; and the preset charge and discharge ratios of multiple batteries are obtained. Based on the preset charge and discharge ratio and the actual charge and discharge current value, the charge and discharge processing mode is determined; wherein the charge and discharge processing mode is used to indicate the charge and discharge rule information. According to the charge and discharge processing mode, the charge and discharge of multiple batteries are controlled, and the output voltage and output current of other power supply modes other than battery power supply are adjusted. In this scheme, the charge and discharge processing mode corresponding to the preset charge and discharge ratio is determined, and the multiple batteries are charged and discharged differentially according to the charge and discharge processing mode. Therefore, in the mixed battery scenario, more effective integrated management of site energy is achieved through the charge and discharge processing mode, so that the differentiated energy storage capacity of green energy and different batteries at the site can be more fully utilized, and the benefits can be maximized under the premise of ensuring the reliability of site power supply, which solves the technical problem that the existing site energy management technology is not fine enough for the charge and discharge management of batteries and fails to fully utilize the energy storage capacity of site batteries.

[0075] Figure 3 A flow chart of another site energy processing method provided in an embodiment of the present application is applied to a power supply system deployed in a site, where the power supply system is deployed with multiple batteries; Figure 3 As shown, the method includes:

[0076] Step 201: monitor actual charge and discharge current values ​​of multiple batteries to obtain actual charge and discharge current values; and obtain preset charge and discharge rates of multiple batteries.

[0077] In one example, the power system is also deployed with multiple photovoltaic devices, multiple rectifier devices and multiple bidirectional DCDC devices; the battery includes an internal battery and an external battery; wherein each bidirectional DCDC device is connected in series with an internal battery; multiple external batteries are in a parallel structure; each bidirectional DCDC device is connected in parallel with multiple external batteries.

[0078] For example, this step can be referred to Figure 1 Step 101 in the above is not described in detail.

[0079] Step 202: Based on the actual charge and discharge current value, if it is determined that the preset charge and discharge ratio is greater than the preset threshold value, the charge and discharge processing mode corresponding to the preset charge and discharge ratio is determined to be the charging mode.

[0080] Exemplarily, based on the actual charge and discharge current value, if it is determined that the preset charge and discharge rate is greater than the preset threshold value 0, that is, when the battery needs to be charged, the power system determines that the charge and discharge processing mode corresponding to the preset charge and discharge rate is the charging mode.

[0081] Step 203: If it is determined that the preset charge and discharge ratio is less than the preset threshold value, the charge and discharge processing mode corresponding to the preset charge and discharge ratio is determined to be the discharge mode.

[0082] Exemplarily, if it is determined that the preset charge and discharge ratio is less than a preset threshold value of 0, that is, when the battery needs to be discharged, the power supply system determines that the charge and discharge processing mode corresponding to the preset charge and discharge ratio is the discharge mode.

[0083] Step 204: If it is determined that the preset charge and discharge ratio is equal to the preset threshold value, the charge and discharge processing mode corresponding to the preset charge and discharge ratio is determined to be a non-charge and non-discharge mode.

[0084] Exemplarily, if it is determined that the preset charge and discharge ratio is equal to the preset threshold value 0, the power supply system determines that the charge and discharge processing mode corresponding to the preset charge and discharge ratio is a non-charge and non-discharge mode.

[0085] Step 205 : Control the charge and discharge of multiple batteries according to the charge and discharge processing mode, and adjust the output voltage and output current of other power supply modes except battery power supply.

[0086] Step 205 includes three implementation methods:

[0087] A first implementation method of step 205: if it is determined that the charge and discharge processing mode is the charging mode, then for each external battery, the output voltage of the photovoltaic device is adjusted to a preset photovoltaic equalizing charging voltage setting value, and the output voltage of the rectifier device is adjusted to a rectifier equalizing charging voltage setting value; wherein, in the charging mode, the actual charge and discharge current value is the actual battery charging current; based on the photovoltaic equalizing charging voltage setting value and the rectifier equalizing charging voltage setting value, a first difference between the actual battery charging current of multiple batteries and a preset battery charging rate current is determined; and based on the first difference, the output current of the photovoltaic device and the rectifier device is adjusted so that the actual battery charging current is close to the preset battery charging rate current; for each built-in battery, the built-in battery is charged differentially according to the charging voltage of the built-in battery and the preset charging current limit.

[0088] A second implementation of step 205: if it is determined that the charge and discharge processing mode is the discharge mode, then for multiple batteries, the output voltage of the photovoltaic device is adjusted to a preset photovoltaic float charge voltage setting value, and the output voltage of the rectifier device is adjusted to a preset rectifier float charge voltage setting value; wherein, in the discharge mode, the actual charge and discharge current value is the actual battery discharge current; based on the photovoltaic float charge voltage setting value and the rectifier float charge voltage setting value, the second difference between the actual battery discharge current of the multiple batteries and the preset battery discharge rate current is determined; and based on the second difference, the output current of the rectifier device is adjusted to make the actual battery discharge current close to the preset battery discharge rate current.

[0089] The second implementation method also includes: determining the voltage value of the bidirectional DCDC device according to preset voltage rule information so that the built-in battery connected in series with the bidirectional DCDC device is discharged first; wherein the preset voltage rule information indicates that the voltage value of the bidirectional DCDC device must be lower than the voltage value of the photovoltaic device, and higher than the voltage value of the rectifier device.

[0090] A third implementation of step 205: If it is determined that the charge and discharge processing mode is a non-charging and non-discharging mode, the output voltage of the photovoltaic device is adjusted to a preset photovoltaic float charge voltage setting value, and the output voltage of the rectifier device is adjusted to a preset rectifier float charge voltage setting value; wherein, in the non-charging and non-discharging mode, the actual charge and discharge current value is the actual battery discharge current; based on the photovoltaic float charge voltage setting value and the rectifier float charge voltage setting value, a third difference between the actual battery discharge current of multiple batteries and a preset battery discharge rate current is determined; and based on the third difference, the output current of the rectifier device is adjusted so that the actual battery discharge current is close to the preset second discharge rate current.

[0091] For example, in the scenario of mixed battery use, different batteries have different characteristics. Typically, traditional lead-acid batteries are better in terms of reliability and are suitable for backup power for site loads; lithium batteries have a higher number of charge and discharge cycles and are more suitable for intelligent applications based on charge and discharge energy storage capabilities such as peak shaving and valley filling. The power supply system controls the battery charge and discharge current by adjusting the output voltage and output current of the photovoltaic equipment and the rectifier equipment while ensuring that the photovoltaic equipment always has priority output. In this scheme, the battery charge and discharge current of each time period is adjusted as a whole, without considering the differentiated charge and discharge control of different batteries. Therefore, the power supply system can charge and discharge multiple batteries in a fine manner according to the charge and discharge processing mode.

[0092] In the first implementation, if it is determined that the charge and discharge processing mode is the charging mode, then for each external battery, the power supply system adjusts the output voltage of the photovoltaic device to the preset photovoltaic equalizing charging voltage setting value, and adjusts the output voltage of the rectifier device to the rectifier equalizing charging voltage setting value, so that multiple batteries are all in a charging state. At this time, the actual charge and discharge current value in the charging mode is the total actual battery charging current of multiple batteries. Based on the photovoltaic equalizing charging voltage setting value and the rectifier equalizing charging voltage setting value in the charging state, the first difference between the actual battery charging current of multiple batteries and the preset battery charging rate current is calculated, the actual battery charging current refers to the charging current during actual charging, and the preset battery charging rate current refers to the preset required charging amount. And based on the first difference, the output current of the photovoltaic device and the rectifier device is adjusted so that the actual battery charging current is within a current range close to the preset battery charging rate current, wherein, in the specific implementation, the current range can be set to a range with the preset battery discharge rate current as the upper limit and the preset battery discharge rate current 90% as the lower limit. For each built-in battery, since the specifications of each built-in battery are different, the charging voltage and the preset charging current limit of the built-in battery are also different. Therefore, the built-in batteries are charged differently according to the charging voltage and the preset charging current limit of each built-in battery.

[0093] In the second implementation, if it is determined that the charge and discharge processing mode is the discharge mode, then for multiple batteries, the output voltage of the photovoltaic device is adjusted to the preset photovoltaic float voltage setting value, and the output voltage of the rectifier device is adjusted to the preset rectifier float voltage setting value, so that the multiple batteries are in a non-charging state. At this time, the actual charge and discharge current value in the discharge mode is the total actual battery discharge current of the multiple batteries. Based on the photovoltaic float voltage setting value and the rectifier float voltage setting value in the non-charging state, the second difference between the actual battery discharge current of the multiple batteries and the preset battery discharge rate current is calculated, wherein the actual battery discharge current can refer to the total discharge current of the multiple batteries during actual discharge, and the preset battery discharge rate current refers to the preset required discharge amount. And based on the second difference, the output current of the rectifier device is adjusted so that the actual battery discharge current is within a current interval close to the preset battery discharge rate current. It should be noted that the current interval of the actual battery discharge current is not more than the preset battery discharge rate current. In the specific implementation, the current interval can be set to a section with the preset battery discharge rate current as the upper limit and the preset battery discharge rate current 90% as the lower limit. In particular, for the discharge mode, when the output current of the rectifier device has dropped to 0, the actual battery discharge current is still less than the lower limit of the battery discharge current control bandwidth, indicating that the output of the photovoltaic module is sufficient and no further adjustment is made to amplify the battery discharge current.

[0094] At the same time, according to the preset voltage rule information, the bidirectional DCDC device sets the busbar output voltage so that the voltage value of the bidirectional DCDC device is lower than that of the photovoltaic device and higher than that of the rectifier device, so that the built-in battery connected to the bidirectional DCDC device is discharged first on the basis of ensuring the priority output of the photovoltaic device. At the same time, based on the characteristics of each battery, the discharge current limiting coefficient, discharge depth and other parameters of the built-in battery connected to each bidirectional DCDC device are set respectively to achieve differentiated discharge of different batteries.

[0095] In the third implementation, if it is determined that the charge and discharge processing mode is a non-charging and non-discharging mode, the output voltage of the photovoltaic device is adjusted to a preset photovoltaic floating charge voltage setting value, and the output voltage of the rectifier device is adjusted to a preset rectifier floating charge voltage setting value, so that the battery is in a non-charging state. At this time, the actual charge and discharge current value in the non-charging and non-discharging mode is the total actual battery discharge current of multiple batteries. Based on the photovoltaic floating charge voltage setting value and the rectifier floating charge voltage setting value in the non-charging state, the third difference between the actual battery discharge current of multiple batteries and the preset battery discharge rate current is determined; wherein the actual battery discharge current may refer to the total discharge current of multiple batteries during actual discharge, and the preset battery discharge rate current refers to the preset required discharge amount. Based on the third difference, the output current of the rectifier device is adjusted so that the actual battery discharge current is in a current interval close to the preset second discharge rate current. Wherein, the above-mentioned photovoltaic floating charge voltage setting value and the rectifier equalizing charge voltage setting value are set for specific battery types, and their values ​​may be the same or different. It should be noted that the current range of the actual battery discharge current is a smaller range near the value of 0, such as an range with 0 (A) as the center point and positive and negative 2A as the upper and lower limits. The actual battery discharge current is a preset value close to 0, and the bidirectional DCDC device can be turned off to achieve no charging or discharging of the battery of the bidirectional DCDC device.

[0096] In addition to the above three implementation methods, if the bidirectional DCDC device shuts off the charge and discharge circuit, the built-in battery connected to the bidirectional DCDC device is in a state of neither charging nor discharging. In specific implementation, a current value range with 0 (A) as the center point and positive and negative 2A as the upper and lower limits can be set. When the actual battery discharge current of the battery exceeds this control bandwidth, the current limiting process control is released; when the actual battery discharge current is less than this control bandwidth, the current limiting process control is performed.

[0097] Therefore, assuming that the external battery is a lead-acid battery and the internal battery is a lithium battery, the lead-acid battery is directly connected to the DC output busbar in an external manner. Each lithium battery is connected to the power system through a bidirectional DCDC device, and the bidirectional DCDC device performs differentiated charging and discharging current and voltage control on each battery connected to the device to solve the problem of mixed battery use. When the power system deployed in the base station adjusts the output voltage of the photovoltaic device and the rectifier device, the output voltage of the photovoltaic device is always higher than the output voltage of the rectifier device. When the power system in the base station adjusts the current limit, the current limit process first limits the output of the rectifier device until it is 0, and then limits the output of the photovoltaic device; when releasing the current limit process, the photovoltaic device is gradually released first, and when the current limit point of the photovoltaic device reaches the maximum, the rectifier device is gradually released. Through the above control strategy, it is ensured that the photovoltaic device always has priority output.

[0098] It should be noted that 1) the control logic of the present application is completed by the cooperation of the bidirectional DCDC device and the site, and the site adjusts the control function of the bidirectional DCDC device by issuing parameters. The control logic can also be completed entirely by the site, and the bidirectional DCDC device acts as an execution component to implement control operations; wherein the parameters include preset values ​​such as the photovoltaic equalizing charge voltage setting value, the rectifier equalizing charge voltage setting value, the photovoltaic floating charge voltage setting value, and the rectifier floating charge voltage setting value. 2) On the basis of the priority output of the photovoltaic device, the built-in battery connected to the bidirectional DCDC device is discharged first, and the built-in batteries connected to different bidirectional DCDC devices can also be individually set whether to participate in the priority discharge. 3) The bidirectional DCDC device is used to connect lithium batteries, and can also be used to connect lead-acid batteries, without limitation.

[0099] In the embodiment of the present application, the actual charge and discharge current values ​​of multiple batteries are monitored to obtain the actual charge and discharge current values; and the preset charge and discharge rates of multiple batteries are obtained. Based on the actual charge and discharge current values, if it is determined that the preset charge and discharge rate is greater than the preset threshold value, the charge and discharge processing mode corresponding to the preset charge and discharge rate is determined to be the charging mode. If it is determined that the preset charge and discharge rate is less than the preset threshold value, the charge and discharge processing mode corresponding to the preset charge and discharge rate is determined to be the discharging mode. If it is determined that the preset charge and discharge rate is equal to the preset threshold value, the charge and discharge processing mode corresponding to the preset charge and discharge rate is determined to be the non-charging and non-discharging mode. According to the charge and discharge processing mode, the charge and discharge of multiple batteries are controlled, and the output voltage and output current of other power supply modes other than battery power supply are adjusted. Therefore, in the battery mixed use scenario, more effective integrated management of site energy is achieved through the charge and discharge processing mode, so that green energy and the differentiated energy storage capacity of different batteries in the site can be more fully utilized, and the benefits are maximized under the premise of ensuring the reliability of site power supply, which solves the technical problem that the existing site energy management technology is not fine enough for the charge and discharge management of batteries and fails to fully utilize the energy storage capacity of site batteries. Moreover, under the unified site energy management framework, differentiated adjustments are made based on the characteristics of different batteries, which not only improves the reliability of site power supply, but also enables the priority use of green energy.

[0100] Figure 4 A schematic diagram of the structure of a site energy processing device provided in an embodiment of the present application is applied to a power supply system deployed in a site, where the power supply system is deployed with multiple batteries; Figure 4 As shown, the device comprises:

[0101] The monitoring unit 31 is used to monitor the actual charge and discharge current values ​​of the multiple batteries to obtain the actual charge and discharge current values; and obtain the preset charge and discharge rates of the multiple batteries.

[0102] The determination unit 32 is used to determine the charge and discharge processing mode based on the preset charge and discharge ratio and the actual charge and discharge current value; wherein the charge and discharge processing mode is used to indicate the charge and discharge rule information.

[0103] The charge and discharge unit 33 is used to control the charge and discharge of multiple batteries according to the charge and discharge processing mode, and adjust the output voltage and output current of other power supply modes except battery power supply.

[0104] The device of this embodiment can execute the technical solution in the above method. Its specific implementation process and technical principles are the same and will not be repeated here.

[0105] Figure 5 A schematic diagram of the structure of another site energy processing device provided in an embodiment of the present application, Figure 4 Based on the embodiment shown, Figure 5 As shown, the determination unit 32 includes:

[0106] The first determination module 321 is used to determine, based on the actual charge and discharge current value, that the charge and discharge processing mode corresponding to the preset charge and discharge rate is the charging mode if it is determined that the preset charge and discharge rate is greater than a preset threshold.

[0107] The second determination module 322 is configured to determine that the charge and discharge processing mode corresponding to the preset charge and discharge ratio is the discharge mode if it is determined that the preset charge and discharge ratio is less than a preset threshold.

[0108] The third determination module 323 is used to determine that the charge and discharge processing mode corresponding to the preset charge and discharge ratio is a non-charge and non-discharge mode if it is determined that the preset charge and discharge ratio is equal to the preset threshold value.

[0109] In one example, the power system is also deployed with multiple photovoltaic devices, multiple rectifier devices and multiple bidirectional DCDC devices; the battery includes an internal battery and an external battery; wherein each bidirectional DCDC device is connected in series with an internal battery; multiple external batteries are in a parallel structure; each bidirectional DCDC device is connected in parallel with multiple external batteries.

[0110] In one example, the charge and discharge unit 33 includes:

[0111] The first regulating module 331 is used for regulating the output voltage of the photovoltaic device to a preset photovoltaic equalizing charging voltage setting value and the output voltage of the rectifier device to a rectifier equalizing charging voltage setting value for each external battery if the charging and discharging processing mode is determined to be the charging mode; wherein, in the charging mode, the actual charging and discharging current value is the actual battery charging current.

[0112] The second regulating module 332 is used to determine a first difference between the actual battery charging current of multiple batteries and a preset battery charging rate current based on a photovoltaic equalizing charging voltage setting value and a rectifier equalizing charging voltage setting value; and to adjust the output current of the photovoltaic device and the rectifier device based on the first difference so that the actual battery charging current is close to the preset battery charging rate current.

[0113] The charging module 333 is used to charge each built-in battery differently according to the charging voltage of the built-in battery and a preset charging current limit.

[0114] In one example, the charge and discharge unit 33 includes:

[0115] The third regulating module 334 is used to adjust the output voltage of the photovoltaic device to a preset photovoltaic float charge voltage setting value and the output voltage of the rectifier device to a preset rectifier float charge voltage setting value for multiple batteries if it is determined that the charge and discharge processing mode is the discharge mode; wherein, in the discharge mode, the actual charge and discharge current value is the actual battery discharge current.

[0116] The fourth regulating module 335 is used to determine the second difference between the actual battery discharge current of multiple batteries and the preset battery discharge rate current based on the photovoltaic float charge voltage setting value and the rectifier float charge voltage setting value; and adjust the output current of the rectifier device based on the second difference so that the actual battery discharge current is close to the preset battery discharge rate current.

[0117] In one example, the device further includes:

[0118] The determination module 336 is used to determine the voltage value of the bidirectional DCDC device according to the preset voltage rule information, so that the built-in battery connected in series with the bidirectional DCDC device is discharged first; wherein the preset voltage rule information indicates that the voltage value of the bidirectional DCDC device must be lower than the voltage value of the photovoltaic device, and higher than the voltage value of the rectifier device.

[0119] In one example, the charge and discharge unit 33 includes:

[0120] The fifth adjustment module 337 is used to adjust the output voltage of the photovoltaic device to a preset photovoltaic float charge voltage setting value and the output voltage of the rectifier device to a preset rectifier float charge voltage setting value if it is determined that the charge and discharge processing mode is a non-charging and non-discharging mode; wherein, in the non-charging and non-discharging mode, the actual charge and discharge current value is the actual battery discharge current.

[0121] The sixth adjustment module 338 is used to determine the third difference between the actual battery discharge current of multiple batteries and the preset battery discharge rate current based on the photovoltaic float charge voltage setting value and the rectifier float charge voltage setting value; and adjust the output current of the rectifier device based on the third difference so that the actual battery discharge current is close to the preset second discharge rate current.

[0122] The device of this embodiment can execute the technical solution in the above method. Its specific implementation process and technical principles are the same and will not be repeated here.

[0123] Figure 6 A schematic diagram of a power supply system provided in an embodiment of the present application is shown in FIG. Figure 6 As shown, the power supply system includes: a memory 51 and a processor 52.

[0124] The memory 51 stores a computer program that can be executed on the processor 52 .

[0125] The processor 52 is configured to execute the method provided in the above embodiment.

[0126] The power supply system further includes a receiver 53 and a transmitter 54. The receiver 53 is used to receive instructions and data sent by an external device, and the transmitter 54 is used to send instructions and data to the external device.

[0127] The embodiment of the present application also provides a non-temporary computer-readable storage medium. When the instructions in the storage medium are executed by the processor of the power supply system, the power supply system can execute the method provided in the above embodiment.

[0128] An embodiment of the present application also provides a computer program product, which includes: a computer program, which is stored in a readable storage medium, and at least one processor of the power supply system can read the computer program from the readable storage medium, and at least one processor executes the computer program so that the power supply system executes the solution provided by any of the above embodiments.

[0129] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0130] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A site energy processing method, characterized in that: Applied to a power supply system deployed in a site, the power supply system is deployed with multiple batteries; the method comprises: Monitor the actual charge and discharge current values ​​of the multiple batteries to obtain the actual charge and discharge current values; and obtain the preset charge and discharge rates of the multiple batteries; Determine a charge and discharge processing mode based on the preset charge and discharge ratio and the actual charge and discharge current value; wherein the charge and discharge processing mode is used to indicate charge and discharge rule information; According to the charge and discharge processing mode, the charge and discharge of the plurality of batteries are controlled, and the output voltage and output current of other power supply modes except battery power supply are adjusted.

2. The method according to claim 1, characterized in that The determining of the charge and discharge processing mode based on the preset charge and discharge rate and the actual charge and discharge current value includes: Based on the actual charge and discharge current value, if it is determined that the preset charge and discharge rate is greater than a preset threshold value, then determining that the charge and discharge processing mode corresponding to the preset charge and discharge rate is a charging mode; If it is determined that the preset charge-discharge ratio is less than a preset threshold value, then determining that the charge-discharge processing mode corresponding to the preset charge-discharge ratio is a discharge mode; If it is determined that the preset charge and discharge ratio is equal to the preset threshold value, the charge and discharge processing mode corresponding to the preset charge and discharge ratio is determined to be a non-charge and non-discharge mode.

3. The method according to claim 2, characterized in that The power supply system is also deployed with multiple photovoltaic devices, multiple rectifier devices and multiple bidirectional DCDC devices; the battery includes an internal battery and an external battery; wherein each of the bidirectional DCDC devices is connected in series with an internal battery; multiple external batteries are in a parallel structure; each of the bidirectional DCDC devices is connected in parallel with multiple external batteries.

4. The method according to claim 3, characterized in that According to the charge and discharge processing mode, the charge and discharge of the plurality of batteries are controlled, and the output voltage and output current of other power supply modes other than battery power supply are adjusted, including: If it is determined that the charge and discharge processing mode is the charging mode, then for each external battery, the output voltage of the photovoltaic device is adjusted to a preset photovoltaic equalizing charging voltage setting value, and the output voltage of the rectifier device is adjusted to a rectifier equalizing charging voltage setting value; wherein, in the charging mode, the actual charge and discharge current value is the actual battery charging current; Based on the photovoltaic equalizing charging voltage setting value and the rectifier equalizing charging voltage setting value, determine a first difference between the actual battery charging current of the plurality of batteries and a preset battery charging rate current; and adjust the output current of the photovoltaic device and the rectifier device based on the first difference so that the actual battery charging current is close to the preset battery charging rate current; For each built-in battery, the built-in battery is charged differentially according to the charging voltage of the built-in battery and a preset charging current limit.

5. The method according to claim 3, characterized in that: According to the charge and discharge processing mode, the charge and discharge of the plurality of batteries are controlled, and the output voltage and output current of other power supply modes other than battery power supply are adjusted, including: If it is determined that the charge and discharge processing mode is the discharge mode, then for the plurality of batteries, the output voltage of the photovoltaic device is adjusted to a preset photovoltaic float charge voltage setting value, and the output voltage of the rectifier device is adjusted to a preset rectifier float charge voltage setting value; wherein, in the discharge mode, the actual charge and discharge current value is the actual battery discharge current; Based on the photovoltaic float charge voltage setting value and the rectifier float charge voltage setting value, determine a second difference between the actual battery discharge current of the multiple batteries and the preset battery discharge rate current; and adjust the output current of the rectifier device based on the second difference so that the actual battery discharge current is close to the preset battery discharge rate current.

6. The method according to claim 5, characterized in that The method further comprises: According to preset voltage rule information, the voltage value of the bidirectional DCDC device is determined so that the built-in battery connected in series with the bidirectional DCDC device is discharged preferentially; wherein the preset voltage rule information indicates that the voltage value of the bidirectional DCDC device must be lower than the voltage value of the photovoltaic device and higher than the voltage value of the rectifier device.

7. The method according to claim 3, characterized in that According to the charge and discharge processing mode, the charge and discharge of the plurality of batteries are controlled, and the output voltage and output current of other power supply modes other than battery power supply are adjusted, including: If it is determined that the charge and discharge processing mode is a non-charging and non-discharging mode, the output voltage of the photovoltaic device is adjusted to a preset photovoltaic floating charge voltage setting value, and the output voltage of the rectifier device is adjusted to a preset rectifier floating charge voltage setting value; wherein, in the non-charging and non-discharging mode, the actual charge and discharge current value is the actual battery discharge current; Based on the photovoltaic float charge voltage setting value and the rectifier float charge voltage setting value, determine a third difference between the actual battery discharge current of the multiple batteries and the preset battery discharge rate current; and adjust the output current of the rectifier device based on the third difference so that the actual battery discharge current is close to the preset second discharge rate current.

8. A site energy processing device, characterized in that: Applicable to a power supply system deployed in a site, wherein the power supply system is deployed with multiple batteries; the device comprises: A monitoring unit, used to monitor the actual charge and discharge current values ​​of the multiple batteries to obtain the actual charge and discharge current values; and obtain the preset charge and discharge rates of the multiple batteries; A determination unit is used to determine a charge and discharge processing mode based on the preset charge and discharge rate and the actual charge and discharge current value; wherein the charge and discharge processing mode is used to indicate charge and discharge rule information; a charge and discharge unit is used to control the charge and discharge of the plurality of batteries according to the charge and discharge processing mode, and adjust the output voltage and output current of other power supply modes except battery power supply.

9. The device according to claim 8, characterized in that The determining unit comprises: A first determination module is used to determine, based on the actual charge and discharge current value, that the charge and discharge processing mode corresponding to the preset charge and discharge rate is a charging mode if it is determined that the preset charge and discharge rate is greater than a preset threshold value; A second determination module, configured to determine that the charge-discharge processing mode corresponding to the preset charge-discharge ratio is a discharge mode if it is determined that the preset charge-discharge ratio is less than a preset threshold value; The third determination module is used to determine that the charge and discharge processing mode corresponding to the preset charge and discharge ratio is a non-charge and non-discharge mode if it is determined that the preset charge and discharge ratio is equal to a preset threshold value.

10. The device according to claim 9, characterized in that The power supply system is also deployed with multiple photovoltaic devices, multiple rectifier devices and multiple bidirectional DCDC devices; the battery includes an internal battery and an external battery; wherein each of the bidirectional DCDC devices is connected in series with an internal battery; multiple external batteries are in a parallel structure; each of the bidirectional DCDC devices is connected in parallel with multiple external batteries.

11. The device according to claim 10, characterized in that The charging and discharging unit comprises: A first regulating module is used for regulating the output voltage of the photovoltaic device to a preset photovoltaic equalizing charging voltage setting value and regulating the output voltage of the rectifier device to a rectifier equalizing charging voltage setting value for each external battery if it is determined that the charging and discharging processing mode is a charging mode; wherein, in the charging mode, the actual charging and discharging current value is the actual battery charging current; a second regulating module, configured to determine a first difference between the actual battery charging current of the plurality of batteries and a preset battery charging rate current based on the photovoltaic equalizing charging voltage setting value and the rectifier equalizing charging voltage setting value; and to regulate the output current of the photovoltaic device and the rectifier device based on the first difference so that the actual battery charging current is close to the preset battery charging rate current; The charging module is used to charge each built-in battery differently according to the charging voltage of the built-in battery and a preset charging current limit.

12. The device according to claim 10, characterized in that The charging and discharging unit comprises: A third regulating module is used for regulating the output voltage of the photovoltaic device to a preset photovoltaic floating charge voltage setting value and regulating the output voltage of the rectifier device to a preset rectifier floating charge voltage setting value for the multiple batteries if it is determined that the charging and discharging processing mode is a discharge mode; wherein, in the discharge mode, the actual charging and discharging current value is the actual battery discharge current; The fourth regulating module is used to determine the second difference between the actual battery discharge current of the multiple batteries and the preset battery discharge rate current based on the photovoltaic float charge voltage setting value and the rectifier float charge voltage setting value; and adjust the output current of the rectifier device based on the second difference so that the actual battery discharge current is close to the preset battery discharge rate current.

13. The device according to claim 12, characterized in that The device also includes: A determination module is used to determine the voltage value of the bidirectional DCDC device according to preset voltage rule information, so that the built-in battery connected in series with the bidirectional DCDC device is discharged preferentially; wherein the preset voltage rule information indicates that the voltage value of the bidirectional DCDC device must be lower than the voltage value of the photovoltaic device, and higher than the voltage value of the rectifier device.

14. The device according to claim 10, characterized in that The charging and discharging unit comprises: A fifth regulating module, for regulating the output voltage of the photovoltaic device to a preset photovoltaic floating charge voltage setting value, and regulating the output voltage of the rectifier device to a preset rectifier floating charge voltage setting value if it is determined that the charging and discharging processing mode is a non-charging and non-discharging mode; wherein, in the non-charging and non-discharging mode, the actual charging and discharging current value is the actual battery discharge current; The sixth regulating module is used to determine the third difference between the actual battery discharge current of the multiple batteries and the preset battery discharge rate current based on the photovoltaic float charge voltage setting value and the rectifier float charge voltage setting value; and adjust the output current of the rectifier device based on the third difference so that the actual battery discharge current is close to the preset second discharge rate current.

15. A power supply system, characterized in that: The method comprises a memory and a processor, wherein the memory stores a computer program executable on the processor, and the processor implements the method according to any one of claims 1 to 7 when executing the computer program.

16. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, which are used to implement the method according to any one of claims 1 to 7 when executed by a processor.

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