Control method of optical storage and charging system, microgrid controller and optical storage and charging system

Abstract

The application relates to the technical field of power electronics, and discloses a control method of a light storage and charging system, a microgrid controller and the light storage and charging system. The light storage and charging system comprises: a multi-stage power distribution line; a power distribution node and a corresponding power distribution collection point are arranged on each power distribution line in the multi-stage power distribution line; target power distribution devices are electrically connected to each power distribution device in a target power distribution line in the multi-stage power distribution line; the method comprises the following steps: acquiring real-time power of at least two power distribution nodes and real-time power of the target power distribution device in the light storage and charging system; and performing power control on the target power distribution device according to the real-time power of the at least two power distribution nodes, preset energy storage power adjustment targets corresponding to the at least two power distribution nodes and the real-time power of the target power distribution device. The preset energy storage power adjustment targets of different power distribution nodes are arranged to realize control of the multi-stage power distribution line, and the output power of the power distribution device can be adjusted in time under the condition of large load fluctuation, so that the power shock problem of the light storage and charging system is avoided.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, and in particular to a control method for a photovoltaic-storage-charging system, a microgrid controller, and the photovoltaic-storage-charging system itself. Background Technology

[0002] With the rapid development of the new energy vehicle industry, sales have increased exponentially, and the scale of supporting charging infrastructure has also increased year by year. This has significantly impacted the traditional power grid due to the resulting demand for electricity capacity. At the same time, the demand for supercharging from new energy vehicle owners is rising rapidly, and the supercharging era has arrived, making it imperative to add supercharging equipment to traditional charging stations. However, the large-scale construction of charging infrastructure and the upgrading of charging stations have placed a strong impact and heavy burden on the existing power grid, leading to a host of problems such as difficulties in expanding charging station capacity, high investment costs, and numerous uncertainties.

[0003] Currently, the coordinated control strategy of photovoltaic-storage-charging systems is often adopted, which involves dynamically adjusting the charging and discharging power of energy storage devices and the power limit of charging devices to alleviate the difficulty of increasing the capacity of charging stations.

[0004] However, in practical applications, existing technologies still have some problems. For example, on the one hand, large fluctuations in charging load may cause the energy storage battery and charging equipment to implement power limiting simultaneously when the load increases suddenly, which may lead to unstable fluctuations in the system's operating power. On the other hand, existing solutions often neglect the power management of specific power distribution lines and power acquisition points at each level of the photovoltaic-energy storage-charging system, which may lead to potential safety risks in the operation of the photovoltaic-energy storage-charging system. Summary of the Invention

[0005] The purpose of this application is to provide a control method, a microgrid controller, and an optical energy storage and charging system to solve the problem of power oscillation during operation of existing optical energy storage and charging systems.

[0006] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows:

[0007] In a first aspect, embodiments of this application provide a control method for a photovoltaic energy storage and charging system, the photovoltaic energy storage and charging system comprising: a multi-level power distribution line; wherein, each power distribution line in the multi-level power distribution line is provided with a power distribution node and a corresponding power distribution acquisition point; a target power distribution line in the multi-level power distribution line is electrically connected to each power distribution device; the method includes:

[0008] The real-time power of at least two power distribution nodes and the real-time power of the target power distribution equipment in the photovoltaic energy storage and charging system are obtained, wherein each power distribution node is located on a power distribution line where the target power distribution equipment is located;

[0009] Power control is performed on the target power distribution equipment based on the real-time power of the at least two power distribution nodes, the preset energy storage power adjustment target corresponding to the at least two power distribution nodes, and the real-time power of the target power distribution equipment.

[0010] Optionally, the target power distribution equipment includes: energy storage equipment and / or charging equipment; the step of power control of the target power distribution equipment based on the real-time power of the at least two power distribution nodes, the preset energy storage power adjustment target corresponding to the at least two power distribution nodes, and the real-time power of the target power distribution equipment includes:

[0011] Based on the real-time power of the at least two distribution nodes, the power adjustment target of the preset target distribution equipment corresponding to the at least two distribution nodes, and the real-time power of the target distribution equipment, the target power adjustment value of the target distribution equipment in the next time period is determined;

[0012] The target power distribution equipment is controlled according to the target power adjustment value.

[0013] Optionally, the multi-level power distribution line includes: a multi-level power distribution line connected in series; the target power distribution equipment includes: an energy storage device; the step of determining the target power adjustment value of the target power distribution equipment in the next time period based on the real-time power of the at least two power distribution nodes, the preset power adjustment target of the target power distribution equipment corresponding to the at least two power distribution nodes, and the real-time power of the target power distribution equipment includes:

[0014] Based on the real-time power of the at least two power distribution nodes, the power adjustment target of the preset energy storage device corresponding to the at least two power distribution nodes, and the real-time power of the energy storage device, the energy storage power adjustment value corresponding to the at least two power distribution nodes is determined respectively.

[0015] If the control strategy of the energy storage device in the next time period is a dynamic capacity expansion strategy of charging and discharging, then the minimum power adjustment value is determined as the first target power adjustment value of the energy storage device in the next time period based on the energy storage power adjustment values ​​corresponding to the at least two power distribution nodes.

[0016] If the control strategy of the energy storage device in the next time period is a dynamic capacity expansion strategy with only discharge, then the minimum power adjustment value is determined as the first target power adjustment value of the energy storage device in the next time period based on the energy storage power adjustment values ​​corresponding to the at least two power distribution nodes and the preset minimum power value.

[0017] Optionally, at least one target-level distribution line in the multi-level distribution lines consists of multiple parallel distribution lines; the target power distribution equipment includes: an energy storage device; determining the target power adjustment value of the target power distribution equipment in the next time period based on the real-time power of the at least two distribution nodes, the preset power adjustment target of the target power distribution equipment corresponding to the at least two distribution nodes, and the real-time power of the target power distribution equipment includes:

[0018] Based on the real-time power of the at least two power distribution nodes, the power adjustment target of the preset energy storage device corresponding to the at least two power distribution nodes, and the real-time power of the energy storage device, the energy storage power adjustment value corresponding to the at least two power distribution nodes is determined respectively.

[0019] Based on the energy storage power adjustment values ​​corresponding to the at least two power distribution nodes, and the real-time power and power adjustment target of the primary power distribution node corresponding to the energy storage device, the primary energy storage power adjustment value corresponding to the primary power distribution node is determined.

[0020] Calculate the total energy storage power adjustment value based on the energy storage power adjustment values ​​of the at least two power distribution nodes;

[0021] Based on the total energy storage power adjustment value and the first-level energy storage power adjustment value, determine whether the energy storage power adjustment values ​​corresponding to the at least two power distribution nodes meet the preset power distribution requirements;

[0022] If the preset power distribution requirements are met, the maximum value among the energy storage power adjustment values ​​of the at least two power distribution nodes is determined as the first target power adjustment value of the energy storage device in the next time period;

[0023] If the preset power distribution requirements are not met, obtain the secondary adjustment values ​​of the energy storage power of the at least two power distribution nodes;

[0024] The secondary adjustment value of the energy storage power of the at least two power distribution nodes is determined to be the first target power adjustment value of the energy storage device in the next time period.

[0025] Optionally, obtaining the secondary adjustment value of the energy storage power of the at least two distribution nodes includes:

[0026] The adjustment range of each power distribution node is obtained based on the energy storage power adjustment value corresponding to the at least two power distribution nodes, the primary energy storage power adjustment value corresponding to the primary power distribution node, and the preset number of power distribution nodes.

[0027] The secondary adjustment value of the energy storage power of the at least two power distribution nodes is determined based on the adjustment range of each power distribution node, the energy storage power adjustment value corresponding to the at least two power distribution nodes, and the power adjustment target of the preset energy storage device.

[0028] Optionally, the target power distribution equipment includes: a charging device; determining the target power adjustment value of the target power distribution equipment in the next time period based on the real-time power of the at least two power distribution nodes, the preset power adjustment target of the target power distribution equipment corresponding to the at least two power distribution nodes, and the real-time power of the target power distribution equipment includes:

[0029] Based on the real-time power of the at least two power distribution nodes, the power adjustment target of the preset charging equipment corresponding to the at least two power distribution nodes, the real-time power of the energy storage device, and the preset maximum output power value of the energy storage device, determine whether the preset maximum output power value of the energy storage device meets the preset power distribution capacity expansion requirements when it is output.

[0030] If the preset power distribution capacity expansion requirement is not met, then the second target power adjustment value of the charging device in the next time period is determined based on the real-time power of the charging device, the real-time power of the at least two power distribution nodes, the preset charging power adjustment target corresponding to the at least two power distribution nodes, the real-time power of the energy storage device, and the preset maximum output power value of the energy storage device.

[0031] Optionally, determining whether the preset maximum output power value of the energy storage device meets the preset power distribution capacity expansion requirement when outputting, based on the real-time power of the at least two power distribution nodes, the preset charging power adjustment target corresponding to the at least two power distribution nodes, the real-time power of the energy storage device, and the preset maximum output power value of the energy storage device, includes:

[0032] Based on the real-time power of the at least two power distribution nodes, the preset charging power adjustment target corresponding to the at least two power distribution nodes, the real-time power of the energy storage device, and the preset maximum output power value of the energy storage device, the charging power adjustment value corresponding to the at least two power distribution nodes is determined respectively.

[0033] Determine whether the maximum power adjustment value among the charging power adjustment values ​​corresponding to the at least two power distribution nodes is greater than or equal to the preset minimum power value;

[0034] If the maximum power adjustment value is greater than or equal to the preset minimum power value, then it is determined that the preset power distribution capacity expansion requirement is not met.

[0035] If the maximum power adjustment value is less than the preset minimum power value, then the preset power distribution capacity expansion requirement is met.

[0036] Optionally, determining whether the preset maximum output power value of the energy storage device meets the preset power distribution capacity expansion requirement when outputting, based on the real-time power of the at least two power distribution nodes, the preset charging power adjustment target corresponding to the at least two power distribution nodes, the real-time power of the energy storage device, and the preset maximum output power value of the energy storage device, further includes:

[0037] If the preset power distribution capacity expansion requirement is met, then the second target power adjustment value of the charging device in the next time period is determined according to the charging power demand of the device to be charged connected to the charging device.

[0038] Secondly, embodiments of this application provide a microgrid controller, including: a processor, a storage medium, and a bus. The storage medium stores machine-readable instructions executable by the processor. When the microgrid controller is running, the processor communicates with the storage medium via the bus, and the processor executes the machine-readable instructions to perform the steps of the control method for the optical storage and charging system as described in any of the first aspects.

[0039] Thirdly, embodiments of this application provide a photovoltaic energy storage and charging system, including: the microgrid controller, transformer substation, multi-level power distribution lines, and power distribution equipment as described in the second aspect;

[0040] The transformer in the distribution area is connected to the multi-level power distribution line; wherein the multi-level power distribution line includes: a series multi-level power distribution line, or at least one target-level power distribution line in the multi-level power distribution line is a series of power distribution lines connected in parallel.

[0041] Each distribution line in the multi-level power distribution line is equipped with a power distribution node and a corresponding power acquisition point; the target power distribution line in the multi-level power distribution line is electrically connected to the power distribution equipment, and the microgrid controller is communicatively connected to the power acquisition point corresponding to each power distribution node and the power distribution equipment to obtain their respective real-time power and control the power distribution equipment; the power distribution equipment includes: photovoltaic equipment, energy storage equipment and charging equipment;

[0042] The microgrid controller is used to execute the control method of the optical storage and charging system described in any of the first aspects above.

[0043] Compared with the prior art, the control method, microgrid controller, and photovoltaic energy storage and charging system provided in this application have the following technical effects:

[0044] This application discloses a control method, a microgrid controller, and a photovoltaic-storage-charging system. The system includes a multi-level power distribution line; each power distribution line has a power distribution node and a corresponding power acquisition point; a target power distribution line in the multi-level power distribution line electrically connects to each power distribution device. The method includes: acquiring the real-time power of at least two power distribution nodes and the real-time power of the target power distribution device in the system to provide a data basis for subsequent control, wherein each power distribution node is located on a power distribution line where the target power distribution device is located; and adjusting the system based on the real-time power of at least two power distribution nodes, a preset energy storage power adjustment target corresponding to the at least two power distribution nodes, and the real-time power of the target power distribution device to achieve rational energy allocation and efficient utilization, thereby enabling power control of the target power distribution device. This allows the photovoltaic-storage-charging system to precisely adjust according to the specific conditions of different power distribution devices and nodes. This refined control can meet the diverse power needs of different users, achieve flexible allocation of power resources, and ensure the power distribution safety of the photovoltaic-storage-charging system. By setting preset energy storage power adjustment targets for different power distribution nodes, the system can control multi-level power distribution lines and adjust the output power of power distribution equipment in a timely manner when the load fluctuates significantly, thus avoiding power oscillation problems in the photovoltaic-energy storage-charging system. Attached Figure Description

[0045] To more clearly illustrate the technical solutions of this application, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and therefore should not be considered as a limitation on the scope of protection of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 A schematic diagram of the structure of a photovoltaic energy storage and charging system provided in this application embodiment. Figure 1 ;

[0047] Figure 2 A schematic diagram of the structure of a photovoltaic energy storage and charging system provided in this application embodiment. Figure 2 ;

[0048] Figure 3 This is a schematic diagram of the structure of a microgrid controller provided in an embodiment of this application;

[0049] Figure 4 A flowchart illustrating a control method for a photovoltaic energy storage and charging system provided in this application embodiment. Figure 1 ;

[0050] Figure 5 A flowchart illustrating a control method for a photovoltaic energy storage and charging system provided in this application embodiment. Figure 2 ;

[0051] Figure 6 A flowchart illustrating a control method for a photovoltaic energy storage and charging system provided in this application embodiment. Figure 3 ;

[0052] Figure 7 A flowchart illustrating a control method for a photovoltaic energy storage and charging system provided in this application embodiment. Figure 4 ;

[0053] Figure 8 A flowchart illustrating a control method for a photovoltaic energy storage and charging system provided in this application embodiment. Figure 5 ;

[0054] Figure 9 A flowchart illustrating a control method for a photovoltaic energy storage and charging system provided in this application embodiment. Figure 6 ;

[0055] Figure 10 A flowchart illustrating a control method for a photovoltaic energy storage and charging system provided in this application embodiment. Figure 7 ;

[0056] Figure 11 A flowchart illustrating a control method for a photovoltaic energy storage and charging system provided in this application embodiment. Figure 8 ;

[0057] Figure 12 A schematic diagram of the operating power curves of various parts under multi-node target control for an embodiment of this application;

[0058] Figure 13 This is a schematic diagram of the structure of a control device for an optical energy storage and charging system provided in an embodiment of this application. Detailed Implementation

[0059] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0060] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0061] Since a photovoltaic-storage-charging system may include: a microgrid controller, a transformer substation, multi-level power distribution lines, and power distribution equipment, and the multi-level power distribution lines may include: multi-level power distribution lines connected in series, or at least one target-level power distribution line in the multi-level power distribution lines being multiple power distribution lines connected in parallel, then... Figure 1 A schematic diagram of the structure of a photovoltaic energy storage and charging system provided in this application embodiment. Figure 1 .like Figure 1As shown, Figure 1 The photovoltaic energy storage and charging system 200 may include: a microgrid controller 210, a transformer substation 220, a multi-level power distribution line 100, and power distribution equipment 230.

[0062] The transformer 220 connects to the multi-level power distribution line 100 to provide electrical signals to it. The multi-level power distribution line 100 is a series-connected system; each power distribution line in the multi-level power distribution line 100 is equipped with a power distribution node 110 and a corresponding power distribution acquisition point 120. The target power distribution line in the multi-level power distribution line 100 is electrically connected to the power distribution equipment 230 to collect power distribution information from the power distribution acquisition point 120 corresponding to the power distribution node 110. The microgrid controller 210 communicates with the power distribution acquisition points 120 corresponding to each power distribution node 110 and the power distribution equipment 230 to obtain their respective real-time power and other power distribution information (such as voltage or current), and controls the power distribution equipment 230. The power distribution equipment 230 may include photovoltaic equipment, energy storage equipment, and charging equipment.

[0063] Among them, the microgrid controller 210 acquires real-time power distribution information to realize the control method of the photovoltaic-storage-charging system.

[0064] It should be noted that, with Figure 1 Taking the series-connected multi-stage power distribution line 100 as an example, Figure 1 The diagram only illustrates a three-level power distribution line, but this should not be construed as a limitation of this application. In practical applications, the number of levels can be increased or decreased according to requirements. Additionally, it should be noted that... Figure 1 On the third-level distribution line, the power distribution equipment 230 and the load are connected in parallel. The type of load is not limited; it can be a DC load or an AC load. If the load is a DC load, since the multi-level distribution line 100 generally transmits AC power, an AC-DC conversion module needs to be connected to the distribution line to which the DC load is connected. For example, in... Figure 1 In the third-level power distribution line, if the connected load is a DC load, an AC-DC conversion module needs to be added between the DC load and the third-level power distribution line. Its function is to convert the AC power on the third-level power distribution line into DC power, thereby providing a suitable electrical signal for the DC load. If the load is an AC load, the third-level power distribution line supplies power to it directly.

[0065] In another possible implementation, Figure 2 A schematic diagram of the structure of a photovoltaic energy storage and charging system provided in this application embodiment. Figure 2 .like Figure 2 As shown, the multi-level power distribution line 100 consists of multiple power distribution lines connected in parallel, with at least one target-level power distribution line among them. Figure 2The diagram only shows the secondary power distribution lines, where the primary power distribution lines are connected in series with two parallel secondary power distribution lines.

[0066] It should be noted that the structure of the multi-level power distribution line 100 in the aforementioned photovoltaic-storage-charging system 200 is not limited to the two types mentioned above. In fact, the multi-level power distribution line 100 may also present other structural forms: for example, the multi-level power distribution line 100 may be composed of a single parallel power distribution line; it may also be composed of a single series power distribution line; or it may be composed of a hybrid series-parallel power distribution line. Given the diversity of actual application scenarios, no specific structural form of the multi-level power distribution line 100 is limited here.

[0067] The photovoltaic-storage-charging system provided in this application can be composed of a microgrid controller, a transformer substation, multi-level power distribution lines, and power distribution equipment. The transformer substation connects to the multi-level power distribution lines. These multi-level power distribution lines include: series-connected multi-level power distribution lines, or multiple parallel power distribution lines where at least one target-level power distribution line is connected in parallel, to adapt to different application scenarios and power demands. For example, in areas with large spaces and dispersed loads, parallel power distribution lines can be flexibly deployed for efficient power distribution; in scenarios with high power supply reliability requirements and tiered transmission, series power distribution lines can better meet the needs. Compared to a single, fixed-structure power distribution line, this greatly improves the adaptability of the photovoltaic-storage-charging system to complex environments and broadens its application scope. In a multi-level power distribution system, each distribution line is equipped with a distribution node and a corresponding power acquisition point. The target distribution line is electrically connected to the distribution equipment, and the microgrid controller is communicatively connected to the power acquisition points and equipment corresponding to each distribution node to obtain their real-time power. The microgrid controller is used for the control method of the photovoltaic-storage-charging system. This allows for precise monitoring of the power operation status of each distribution line and equipment, timely detection of abnormal power fluctuations and equipment failures, ensuring the stable operation of the photovoltaic-storage-charging system and providing a data foundation for subsequent precise control. The system also controls the distribution equipment, including photovoltaic equipment, energy storage equipment, and charging equipment. Based on the power generation of the photovoltaic equipment, the power consumption of the energy storage equipment, and the power demand of the charging equipment, the system enables coordinated operation among these devices. For example, when the photovoltaic equipment generates excess power, the energy storage equipment is controlled to charge and store the excess energy; when there is peak electricity demand and insufficient photovoltaic power generation, the energy storage equipment is controlled to discharge, cooperating with the photovoltaic equipment to supply power to the charging equipment. This optimizes energy distribution, improves energy utilization efficiency, reduces dependence on the external power grid, and achieves intelligent and efficient operation of the photovoltaic-storage-charging system.

[0068] Furthermore, to clearly describe the optical storage and charging system 200 provided in the above embodiments, this application also provides a structural schematic diagram of a microgrid controller 210. Figure 3This is a schematic diagram of a microgrid controller provided in an embodiment of this application. Figure 3 As shown, the microgrid controller 210 may include a processor 211 and a memory 212.

[0069] The memory 212 stores machine-executable instructions that can be executed by the processor 211. When the microgrid controller 210 is running, it executes these machine-readable instructions. The processor 211 and the memory 212 communicate via a bus. The processor 211 can execute these machine-executable instructions to implement the control method for the optical storage and charging system.

[0070] The memory 212, processor 211, and bus components are electrically connected directly or indirectly to achieve data transmission or interaction. For example, these components can be electrically connected to each other through one or more communication buses or signal lines. The mobile storage device includes at least one software function module that can be stored in the memory 212 in the form of software or firmware or embedded in the operating system (OS) of the microgrid controller. The processor 211 is used to execute executable modules stored in the memory 212, such as the software function modules and computer programs included in the control method of the optical storage and charging system of the mobile storage medium.

[0071] The memory 212 may be, but is not limited to, random access memory (RAM), read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), etc.

[0072] The control method of the optical storage and charging system provided in the embodiments of this application can be executed by the processor in the microgrid controller 210 in the optical storage and charging system 200. The control method of the optical storage and charging system provided in the above embodiments of this application will be explained and described in detail below with reference to the accompanying drawings. Figure 4 A flowchart illustrating a control method for a photovoltaic energy storage and charging system provided in this application embodiment. Figure 1 .like Figure 4 As shown, applied to the above Figure 1The photovoltaic energy storage and charging system 200 may include: a multi-level power distribution line 100; wherein each power distribution line in the multi-level power distribution line 100 is equipped with a power distribution node 110 and a corresponding power distribution acquisition point 120; the target power distribution line in the multi-level power distribution line 100 is electrically connected to each power distribution device 230, and the method may include:

[0073] S301. Obtain the real-time power of at least two power distribution nodes in the photovoltaic-storage-charging system and the real-time power of the target power distribution equipment.

[0074] Each distribution node is located on a distribution line where the target distribution equipment is located.

[0075] In one possible implementation, the microgrid controller in the photovoltaic-storage-charging system acquires the real-time power P_run_pcc of the power acquisition points corresponding to at least two power distribution nodes in the system. The real-time power P_run_pcc represents the real-time power of at least two power distribution nodes. Simultaneously, the microgrid controller also acquires the real-time power P_run of the target power distribution equipment to understand the power status of each power distribution node and the target power distribution equipment, providing a data basis for subsequent control.

[0076] S302. Based on the real-time power of at least two power distribution nodes, the preset energy storage power adjustment target corresponding to at least two power distribution nodes, and the real-time power of the target power distribution equipment, perform power control on the target power distribution equipment.

[0077] Among them, the preset energy storage power adjustment targets corresponding to at least two power distribution nodes are the power adjustment target values ​​that the target power distribution equipment corresponding to the power distribution nodes of each level of power distribution line should achieve under different operating conditions, which are pre-set by the photovoltaic-storage-charging system.

[0078] In one possible implementation, the microgrid controller reflects the actual power transmission status at different nodes on the distribution line based on the real-time power P_run_pcc of at least two distribution nodes; the preset energy storage power adjustment target P_con_pcc corresponding to at least two distribution nodes determines the power adjustment target value that the target power distribution equipment should achieve under different operating conditions; and the real-time power P_run of the target power distribution equipment determines the power status of the target power distribution equipment at the current moment; thereby realizing power control of the target power distribution equipment.

[0079] This application provides a control method for a photovoltaic-storage-charging system, wherein the system includes a multi-level power distribution line; each power distribution line in the multi-level power distribution line is equipped with a power distribution node and a corresponding power acquisition point; a target power distribution line in the multi-level power distribution line is electrically connected to each power distribution device; the method may include: acquiring the real-time power of at least two power distribution nodes and the real-time power of the target power distribution device in the photovoltaic-storage-charging system to provide a data basis for subsequent control, wherein each power distribution node is located on a power distribution line where the target power distribution device is located; based on the real-time power of at least two power distribution nodes, the preset energy storage power adjustment target corresponding to at least two power distribution nodes, and the real-time power of the target power distribution device, to achieve reasonable energy allocation and efficient utilization, thereby realizing power control of the target power distribution device, enabling the photovoltaic-storage-charging system to make precise adjustments according to the specific conditions of different power distribution devices and different power distribution nodes. This refined control can not only meet the diverse power needs of different users, but also realize the flexible allocation of power resources and ensure the power distribution safety of the photovoltaic-storage-charging system. By setting preset energy storage power adjustment targets for different power distribution nodes, the system can control multi-level power distribution lines and adjust the output power of power distribution equipment in a timely manner when the load fluctuates significantly, thus avoiding power oscillation problems in the photovoltaic-energy storage-charging system.

[0080] Optionally, the aforementioned target power distribution equipment may include: energy storage equipment and / or charging equipment.

[0081] In one possible implementation, Figure 5 A flowchart illustrating a control method for a photovoltaic energy storage and charging system provided in this application embodiment. Figure 2 .like Figure 5 As shown, the above method, which controls the power of the target power distribution equipment based on the real-time power of at least two power distribution nodes, the preset energy storage power adjustment target corresponding to at least two power distribution nodes, and the real-time power of the target power distribution equipment, may include:

[0082] S401. Based on the real-time power of at least two distribution nodes, the power adjustment target of the preset target distribution equipment corresponding to at least two distribution nodes, and the real-time power of the target distribution equipment, determine the target power adjustment value of the target distribution equipment in the next time period.

[0083] In one possible implementation, the microgrid controller adjusts the target power of the target power distribution equipment in the next time period based on the real-time power P_run_pcc of at least two power distribution nodes and the power adjustment target P_con_pcc of the target power distribution equipment corresponding to at least two power distribution nodes, as well as the real-time power P_run of the target power distribution equipment, in order to avoid problems such as overload and underload of power distribution lines caused by power imbalance. Then, based on these three types of data, the target power adjustment value P_set_fin of the target power distribution equipment in the next time period is determined, which helps to achieve reasonable energy allocation and efficient utilization, meet the power demand in different scenarios, and improve the adaptability and flexibility of the photovoltaic energy storage and charging system.

[0084] S402. Perform power control on the target power distribution equipment according to the target power adjustment value.

[0085] In one possible implementation, power control is performed on the target power distribution equipment based on the target power adjustment value P_set_fin. The power control method differs depending on the type of target power distribution equipment. Taking an energy storage device as an example, if the target power adjustment value P_set_fin requires an increase in charging power, the energy storage device will adjust the parameters of its internal power electronic converter, such as changing the on-time and frequency of switching devices, thereby increasing the rate at which it absorbs electrical energy from the grid or photovoltaic equipment, thus increasing the charging power. If an increase in discharging power is required, the converter will be adjusted to allow it to store more electrical energy and output it to the distribution line at a higher power. If the target power distribution equipment is a charging device, and the target power adjustment value P_set_fin requires a decrease in charging power, the charging device may reduce the charging power by decreasing the output voltage or current.

[0086] The control method for the photovoltaic-storage-charging system provided in this application includes a target power distribution device that may include: energy storage device and / or charging device; based on the real-time power of at least two power distribution nodes, the preset power adjustment target of the target power distribution device corresponding to at least two power distribution nodes, and the real-time power of the target power distribution device, the target power adjustment value of the target power distribution device in the next time period is determined to achieve reasonable energy allocation; the power control of the target power distribution device is performed according to the target power adjustment value, so that the photovoltaic-storage-charging system can calculate the target power adjustment value more accurately, predict power demand in advance, achieve advanced power regulation, and thus promote the intelligent management of the photovoltaic-storage-charging system.

[0087] Optionally, the aforementioned multi-level power distribution lines may include: multi-level power distribution lines connected in series; see above. Figure 1 In one possible implementation, the target power distribution equipment may include an energy storage device.

[0088] Figure 6 A flowchart illustrating a control method for a photovoltaic energy storage and charging system provided in this application embodiment. Figure 3 .like Figure 6As shown, the method described above, which determines the target power adjustment value of the target distribution equipment in the next time period based on the real-time power of at least two distribution nodes, the preset power adjustment target of the target distribution equipment corresponding to at least two distribution nodes, and the real-time power of the target distribution equipment, may include:

[0089] S501. Based on the real-time power of at least two power distribution nodes, the power adjustment target of the preset energy storage device corresponding to at least two power distribution nodes, and the real-time power of the energy storage device, determine the energy storage power adjustment value corresponding to at least two power distribution nodes respectively.

[0090] In one possible implementation method, with Figure 1 For example, the real-time power P_run_pcc1 of the first-level power distribution node, the real-time power P_run_pcc2 of the second-level power distribution node, and the real-time power P_run_pcc3 of the third-level power distribution node are obtained. The power adjustment target P_con_pcc1_des of the preset energy storage device corresponding to the first-level power distribution node, the power adjustment target P_con_pcc2_des of the preset energy storage device corresponding to the second-level power distribution node, and the power adjustment target P_con_pcc3_des of the preset energy storage device corresponding to the third-level power distribution node are obtained. At the same time, the real-time power P_run_des of the energy storage device is obtained. Then, the energy storage power adjustment value P_set_des_pcc corresponding to satisfy the power adjustment target of each power distribution node is calculated according to the following formula (1).

[0091] P_set_des_pcc1=P_run_des+(P_con_pcc1_des-P_run_pcc1);

[0092] P_set_des_pcc2=P_run_des+(P_con_pcc2_des-P_run_pcc2);

[0093] P_set_des_pcc3=P_run_des+(P_con_pcc3_des-P_run_pcc3); formula (1)

[0094] Wherein, P_con_pcc1_des is the main power distribution acquisition point for the primary power distribution line ( Figure 1 The preset power regulation target for energy storage devices (120-1) in the middle; P_set_des_pcc1 is for the main power distribution acquisition point ( Figure 1 The energy storage power adjustment value (120-1) is the target value for energy storage power adjustment at the main power distribution acquisition point, i.e., the setting value that the energy storage equipment should operate at in the next stage. P_con_pcc2_des is the power distribution acquisition point for the secondary power distribution line (…). Figure 1The preset power regulation target for energy storage devices (120-2) in the middle; P_set_des_pcc2 is the power acquisition point for secondary power distribution lines ( Figure 1 The energy storage power regulation value (120-2) is obtained. This can be further extended to obtain the preset energy storage device power regulation target P_con_pccn_des and energy storage power regulation value P_set_des_pccn for multi-level power distribution lines.

[0095] S502. If the control strategy of the energy storage device in the next time period is a dynamic capacity expansion strategy of charging and discharging, then the minimum power adjustment value is determined as the first target power adjustment value of the energy storage device in the next time period based on the energy storage power adjustment values ​​corresponding to at least two power distribution nodes.

[0096] In one possible implementation, if the control strategy of the energy storage device in the next time period is a dynamic capacity expansion strategy of charging and discharging, then the minimum power regulation value is determined according to the following formula (2) based on the energy storage power regulation value P_set_des_pcc corresponding to at least two power distribution nodes. The minimum power regulation value is the first target power regulation value P1_set_des_fin of the energy storage device in the next time period.

[0097] P1_set_des_fin=min(P_set_des_pcc1, P_set_des_pcc2,...P_set_des_pccn);

[0098] Where n is a positive integer greater than 0. Formula (2)

[0099] It should be noted that when calculating the first target power adjustment value P1_set_des_fin of the energy storage device in the next period using the above formula (2), the relevant factors of peak, flat and valley periods were not taken into consideration before being issued.

[0100] S503. If the control strategy of the energy storage device in the next time period is a dynamic capacity expansion strategy with only discharge, then the minimum power adjustment value is determined as the first target power adjustment value of the energy storage device in the next time period based on the energy storage power adjustment values ​​corresponding to at least two power distribution nodes and the preset minimum power value.

[0101] The preset minimum power value can be selected according to the actual operating conditions of the energy storage device. For example, the preset minimum power value can be 0KW.

[0102] In one possible implementation, if the control strategy of the energy storage device in the next time period is a dynamic capacity expansion strategy of only discharging, then the minimum power adjustment value is determined according to the following formula (3) based on the energy storage power adjustment value P_set_des_pcc corresponding to at least two power distribution nodes and the preset minimum power value (such as 0KW). The minimum power adjustment value is the first target power adjustment value P1_set_des_fin of the energy storage device in the next time period.

[0103] P_set_des_fin=min(0, P_set_des_pcc1, P_set_des_pcc2,...P_set_des_pccn);

[0104] Where n is a positive integer greater than 0. Formula (3)

[0105] It should be noted that when the first target power adjustment value P1_set_des_fin of the energy storage device in the next period is calculated by the above formula (3), the relevant factors of the peak, flat and valley periods are taken into consideration before it is issued. During this period, it is necessary to avoid charging the energy storage device during the power distribution capacity expansion.

[0106] For example, continue to refer to Figure 1 In practical applications, the dynamic capacity expansion of energy storage devices generally needs to be combined with peak, flat and valley periods. The energy storage device can be divided according to the peak, flat and valley periods to realize the timed charging and discharging function of the energy storage device. In addition, the energy storage device also needs to have the relevant functions of anti-backflow, maximum demand control and dynamic capacity expansion.

[0107] In one possible implementation, the charging and dynamic capacity expansion strategy of the energy storage device during off-peak hours can be determined by the following formula (4) to determine the first target power regulation value P1_set_des_fin of the energy storage device in the next period.

[0108] P1_set_des_fin=min{P_run_des+(P_con_pcc1_des-P_run_pcc1), P_run_des+(P_con_pcc2_des-P_run_pcc2),…P_run_des+(P_con_pccn_des-P_run_pccn)};

[0109] Where n is a positive integer greater than 0. Formula (4)

[0110] In another possible implementation, the strategy of dynamically increasing the capacity of the energy storage device without charging during normal periods can be determined by the following formula (5) to determine the first target power adjustment value P1_set_des_fin of the energy storage device in the next period.

[0111] P1_set_des_fin=min(0, P_run_des+(P_con_pcc1_des-P_run_pcc1), P_run_des+(P_con_pcc2_des-P_run_pcc2),…P_run_des+(P_con_pccn_des-P_run_pccn)};

[0112] Where n is a positive integer greater than 0. Formula (5)

[0113] In another possible implementation, since the charging and dynamic capacity expansion strategies for energy storage devices during normal periods are the same as those during off-peak periods, the first target power adjustment value P1_set_des_fin for the energy storage device in the next period is also the same. This will not be elaborated further here.

[0114] In another possible implementation, the normal discharge strategy of the energy storage device during peak hours can be determined by the following formula (6) to determine the first target power regulation value P1_set_des_fin of the energy storage device in the next period.

[0115] P1_set_des_fin=P_run_des+(P_con_pcc1_ref-P_run_pcc1) Formula (6)

[0116] Where P_con_pcc1_ref is the power control target value for reverse current prevention in the photovoltaic-storage-charging system, which is generally set to 0KW. Since the photovoltaic-storage-charging system only considers reverse current prevention during peak hours, the target value is set to 0KW from the main power distribution acquisition point (e.g., ...). Figure 1 120-1 in the middle is used as the anti-backflow control point.

[0117] It should be noted that the above are several embodiments for determining the first target power adjustment value P1_set_des_fin of the energy storage device in the next time period, and should not be construed as limiting this application.

[0118] The control method for the photovoltaic-energy storage-charging system provided in this application, when the multi-level power distribution line is a series multi-level power distribution line and the target power distribution equipment is an energy storage device, can determine the energy storage power adjustment value corresponding to at least two distribution nodes based on the real-time power of at least two distribution nodes, the preset power adjustment target of the energy storage device corresponding to at least two distribution nodes, and the real-time power of the energy storage device. This allows for a more accurate understanding of the power status of the power distribution line at different locations, thereby enabling the energy storage device to operate more efficiently and rationally throughout the series power distribution line. If the control strategy of the energy storage device in the next time period is a dynamic capacity expansion strategy for charging and discharging, then the minimum power adjustment value is determined based on the energy storage power adjustment value corresponding to at least two distribution nodes, which is the first target power adjustment value of the energy storage device in the next time period. This ensures that the energy storage device charges and discharges in the most conservative and safe power adjustment manner under complex and variable series power distribution line environments. This avoids power imbalance at a certain distribution node or damage to the performance of the energy storage device itself due to excessive power adjustment, thus maintaining the stability of the photovoltaic-energy storage-charging system. If the control strategy for the energy storage device in the next time period is a dynamic capacity expansion strategy with only discharge, then the minimum power adjustment value is determined based on the energy storage power adjustment values ​​corresponding to at least two distribution nodes and the preset minimum power value, considering the special requirements of the energy storage device in the next time period with only discharge. This ensures that the energy storage device maintains a safe power range that meets the needs of the photovoltaic-energy storage-charging system during discharge. For example, during peak electricity consumption and when photovoltaic equipment generates insufficient power, the energy storage device discharges with an appropriate minimum power adjustment value, which can supplement the power of the photovoltaic-energy storage-charging system without affecting its service life and performance due to over-discharge, while ensuring the power stability of the series distribution line.

[0119] Optionally, at least one target-level distribution line in the above-mentioned multi-level distribution lines consists of multiple distribution lines connected in parallel; refer to the above. Figure 2 In one possible implementation, the target power distribution equipment may include an energy storage device.

[0120] Figure 7 A flowchart illustrating a control method for a photovoltaic energy storage and charging system provided in this application embodiment. Figure 4 .like Figure 7 As shown, the method described above, which determines the target power adjustment value of the target distribution equipment in the next time period based on the real-time power of at least two distribution nodes, the preset power adjustment target of the target distribution equipment corresponding to at least two distribution nodes, and the real-time power of the target distribution equipment, may include:

[0121] S601. Based on the real-time power of at least two power distribution nodes, the power adjustment target of the preset energy storage device corresponding to at least two power distribution nodes, and the real-time power of the energy storage device, determine the energy storage power adjustment value corresponding to at least two power distribution nodes respectively.

[0122] In one possible implementation method, with Figure 2 For example, the real-time power P_run_pcc0 of the primary distribution node and the real-time power P_run_pcc1 and P_run_pcc2 of the two secondary distribution nodes are obtained, and the power adjustment target P_con_pcc0_des of the preset energy storage device corresponding to the primary distribution node and the power adjustment target P_con_pcc1_des and P_con_pcc2_des of the preset energy storage device corresponding to the secondary distribution node are obtained; at the same time, the real-time power P_run_des of the energy storage device is obtained; considering the power distribution capacity expansion of the energy storage device, the energy storage power adjustment value P_set_des_n corresponding to satisfy the power control target of each distribution node is calculated by the following formula (7).

[0123] P_set_des_n=P_run_des_n+P_con_pcc_n-P_run_pcc_n

[0124] Where n is a positive integer greater than 0. Formula (7)

[0125] Wherein, P_set_des_n represents the power regulation target within the power acquisition point of the nth power distribution line, and is the preset operating power value of the energy storage device for the next stage calculated at the initial time. Wherein, P_con_pcc_n represents the power regulation target of the power distribution node corresponding to the energy storage device within the power acquisition point of the nth power distribution line; P_run_pcc_n represents the real-time operating power value of the power distribution node corresponding to the energy storage device within the power acquisition point of the nth power distribution line; the preset initial time can be selected according to the actual situation, for example, the preset initial time can be selected as time T0.

[0126] S602. Determine the primary energy storage power adjustment value corresponding to the primary distribution node based on the energy storage power adjustment values ​​corresponding to at least two distribution nodes, and the real-time power and power adjustment target of the primary distribution node corresponding to the energy storage device.

[0127] In one possible implementation, the sum of the real-time operating power P_run_des of all energy storage devices in the photovoltaic-energy storage-charging system is first calculated using the following formula (8) based on the real-time power P_run_des of the energy storage power corresponding to at least two power distribution nodes.

[0128]

[0129] Where n is a positive integer greater than 0. Formula (8)

[0130] Wherein, P_run_des_n represents the real-time operating power value of the energy storage device in the power collection point on the nth power distribution line.

[0131] Then, based on the above formula (8), the sum of the real-time operating power of the energy storage devices, P_run_des, and the corresponding primary power distribution node (such as...) of the energy storage devices are obtained. Figure 2 The real-time power P_run_pcc0 and power regulation target P_con_pcc0 of 110-1) are used to determine the first-level energy storage power regulation value P_set_des total corresponding to the first-level distribution node through the following formula (9).

[0132] P_set_des_total = P_run_des_total + P_con_pcc0 - P_run_pcc0 (Formula 9)

[0133] Wherein, P_set_des generally refers to the total power distribution node (e.g., ... Figure 2 The power regulation target of P_con_pcc0 is the operating power value of all energy storage devices in the photovoltaic-storage-charging system in the next stage; where P_con_pcc0 represents the power regulation target of the total power distribution node of the photovoltaic-storage-charging system; and P_run_pcc0 represents the real-time operating power value of the total power distribution node of the photovoltaic-storage-charging system.

[0134] S603. Calculate the total energy storage power adjustment value based on the energy storage power adjustment values ​​of at least two distribution nodes.

[0135] In one possible implementation, the total energy storage power regulation value P_set_des_n_total is calculated by formula (10) based on the energy storage power regulation value P_set_des of at least two distribution nodes, referring to the above formula (7).

[0136]

[0137] Where n is a positive integer greater than 0. Formula (10)

[0138] S604. Based on the total energy storage power adjustment value and the first-level energy storage power adjustment value, determine whether the energy storage power adjustment values ​​corresponding to at least two power distribution nodes meet the preset power distribution requirements.

[0139] The preset power distribution requirements can be selected according to the actual situation.

[0140] In one possible implementation, based on the total energy storage power regulation value P_set_des_n_total and the primary energy storage power regulation value P_set_des_total, it is determined whether the energy storage power regulation value P_set_des corresponding to at least two distribution nodes meets the preset power distribution requirements. If the preset power distribution requirements are met, step S605 can be executed; if the preset power distribution requirements are not met, step S606 can be executed.

[0141] S605. If the preset power distribution requirements are met, determine the maximum value among the energy storage power adjustment values ​​of at least two power distribution nodes as the first target power adjustment value of the energy storage device in the next time period.

[0142] In one possible implementation, if the preset power distribution requirements are met, i.e., the total energy storage power regulation value P_set_des_n_total is greater than or equal to the first-level energy storage power regulation value P_set_des_total, i.e., the total power distribution node (e.g., Figure 2 If the preset power distribution requirements are met (110-1) and all branch power distribution nodes other than the main power distribution node also meet the preset power distribution requirements, then the corresponding energy storage power adjustment value (such as P_set_des_1, P_set_des_2, ..., P_set_des_n) of each power distribution node is directly compared with the preset maximum output power value P_max_des_n of the energy storage device to obtain the maximum value corresponding to each power distribution node and then issue it. The maximum value corresponding to each power distribution node is the first target power adjustment value of the energy storage device in the next time period.

[0143] S606. If the preset power distribution requirements are not met, obtain the secondary adjustment values ​​of the energy storage power of at least two power distribution nodes.

[0144] In one possible implementation, if the preset power distribution requirements are not met, i.e., the total energy storage power regulation value P_set_des_n_total is less than the first-level energy storage power regulation value P_set_des_total, then the total power distribution node (such as...) Figure 2 If 110-1 in the above does not meet the preset power distribution requirements, but each branch power distribution node other than the main power distribution node meets the preset power distribution requirements, then the corresponding energy storage power adjustment value (such as P_set_des_1, P_set_des_2, ... P_set_des_n) of each power distribution node needs to be adjusted before it can be sent down, that is, the secondary adjustment value P_send_des_n of the energy storage power of at least two power distribution nodes needs to be obtained.

[0145] S607. Determine the secondary regulation value of the energy storage power of at least two distribution nodes as the first target power regulation value of the energy storage device in the next time period.

[0146] In one possible implementation, the total energy storage power secondary regulation value P_send_des_n_total is calculated using the following formula (11) based on the secondary regulation values ​​P_send_des_n of the energy storage power at at least two distribution nodes.

[0147]

[0148] Where n is a positive integer greater than 0. Formula (11)

[0149] Based on the total secondary regulation value of energy storage power P_send_des_n_total obtained from the above formula (11), determine the relationship between it and the primary energy storage power regulation value P_set_des_total corresponding to the primary distribution node. If P_send_des_n_total ≤ P_set_des_total, then determine the secondary regulation value of energy storage power P_send_des_n of at least two distribution nodes as the first target power regulation value of the energy storage device in the next time period, and issue it.

[0150] If P_send_des_n_total > P_set_des_total, it indicates that the energy storage devices at some distribution acquisition points on some distribution lines have reached their maximum output capacity. In this case, if the secondary adjustment value P_send_des_n of the energy storage power for at least two distribution nodes is directly issued, the real-time operating power of some distribution nodes may not meet the power adjustment targets of each distribution node. Therefore, the secondary adjustment value P_send_des_n of the energy storage power for at least two distribution nodes needs to be optimized before being issued. The optimized secondary adjustment value P_send_des_n of the energy storage power for at least two distribution nodes is the first target power adjustment value for the energy storage devices in the next time period.

[0151] The optimization method for the secondary regulation value P_send_des_n of energy storage power at at least two distribution nodes is as follows:

[0152] According to the following formula (12), the energy storage power secondary adjustment value P_send_des_n of the nth distribution node is optimized for the first time to obtain the first optimized energy storage power secondary adjustment value P_send_des_n_T1.

[0153]

[0154] Where n is a positive integer greater than 0. Formula (12)

[0155] Among them, based on the first optimized energy storage power secondary adjustment value P_send_des_n_T1, the total first optimized energy storage power secondary adjustment value P_send_des_n_T1_total corresponding to the energy storage power secondary adjustment value P_send_des_n of at least two distribution nodes is calculated according to the following formula (13).

[0156]

[0157] Where n is a positive integer greater than 0. Formula (13)

[0158] If the total first optimized energy storage power secondary adjustment value P_send_des_n_T1_total is less than or equal to the first-level energy storage power adjustment value P_set_des_total corresponding to the first-level distribution node (i.e., P_send_des_n_T1_<< P_set_des_total), then the first optimized energy storage power secondary adjustment value P_send_des_n_T1 of each distribution node is determined as the first target power adjustment value of the energy storage device in the next time period and is issued.

[0159] If the total first optimized energy storage power secondary adjustment value P_send_des_n_T1_total is greater than the first-level energy storage power adjustment value P_set_des_total corresponding to the first-level distribution node (i.e., P_send_des_n_T1_total > P_set_des_total), then the energy storage power secondary adjustment value P_send_des_n of the nth distribution node needs to be optimized for the second time according to the following formula (14) to obtain the second optimized energy storage power secondary adjustment value P_send_des_n_T2.

[0160]

[0161] Where n is a positive integer greater than 0. Formula (14)

[0162] Among them, based on the second optimized energy storage power secondary adjustment value P_send_des_n_T2, the total second optimized energy storage power secondary adjustment value P_send_des_n_T2_total corresponding to the energy storage power secondary adjustment value P_send_des_n of at least two distribution nodes is calculated according to the following formula (15).

[0163]

[0164] Where n is a positive integer greater than 0. Formula (15)

[0165] If the total second-optimized energy storage power secondary adjustment value P_send_des_n_T2_total is less than or equal to the first-level energy storage power adjustment value P_set_des_total corresponding to the first-level distribution node (i.e., P_send_des_n_T2_total ≤ P_set_des_total), then the second-optimized energy storage power secondary adjustment value P_send_des_n_T2 of each distribution node is determined as the first target power adjustment value of the energy storage device in the next time period and is issued.

[0166] If the total second-optimized energy storage power secondary adjustment value P_send_des_n_T2_total is greater than the primary energy storage power adjustment value P_set_des_total corresponding to the primary distribution node (i.e., P_send_des_n_T2_total > P_set_des_total), then a third optimization is needed for the energy storage power secondary adjustment value P_send_des_n of the nth distribution node to obtain the third-optimized energy storage power secondary adjustment value P_send_des_n_T3. This process continues until the total second-optimized energy storage power secondary adjustment value P_send_des_n_Tn_total ≤ the primary energy storage power adjustment value P_set_des_total corresponding to the primary distribution node. At this point, the optimization process ends, and the nth-optimized energy storage power secondary adjustment value P_send_des_n_Tn of each distribution node is determined as the first target power adjustment value for the energy storage device in the next time period and is then issued.

[0167] It should be noted that the total number of optimizations for the secondary adjustment value P_send_des_n of the energy storage power of at least two power distribution nodes in the photovoltaic-storage-charging system does not exceed n-1. Finally, the first target power adjustment value of the energy storage device corresponding to each power distribution node in the next time period can be obtained and distributed.

[0168] The control method for the photovoltaic-storage-charging system provided in this application, if at least one target-level distribution line in a multi-level power distribution line consists of multiple parallel distribution lines, and the target power distribution equipment is an energy storage device, then based on the real-time power of at least two distribution nodes, the preset power adjustment targets of the energy storage devices corresponding to at least two distribution nodes, and the real-time power of the energy storage devices, the energy storage power adjustment values ​​corresponding to at least two distribution nodes are determined respectively. This accurately captures the unique power conditions of different parallel distribution line nodes, making the power adjustment of the energy storage devices more aligned with the actual needs of each distribution node, and optimizing the energy storage utilization efficiency of the entire parallel distribution line area. Based on the energy storage power adjustment values ​​corresponding to at least two distribution nodes, and the real-time power and power adjustment targets of the first-level distribution nodes corresponding to the energy storage devices, the first-level energy storage power adjustment value corresponding to the first-level distribution nodes is determined. Based on the energy storage power adjustment values ​​of at least two distribution nodes, the total energy storage power adjustment value is calculated. Based on the total energy storage power adjustment value and the first-level energy storage power adjustment value, it is determined whether the energy storage power adjustment values ​​corresponding to at least two distribution nodes meet the preset power distribution requirements, thereby establishing a coordinated control mechanism from local nodes to the overall photovoltaic-storage-charging system. This system uses primary power distribution nodes as key hubs, comprehensively considering the power regulation of each parallel line node to ensure the balance and stability of power distribution in the entire photovoltaic-storage-charging system, and guaranteeing the stable operation of each power distribution line and the entire system. If the preset power distribution requirements are met, the maximum value among the energy storage power regulation values ​​of at least two power distribution nodes is determined as the first target power regulation value for the energy storage device in the next time period. This ensures that the energy storage device operates in a relatively efficient and unloaded state while meeting the overall needs of the photovoltaic-storage-charging system. If the preset power distribution requirements are not met, secondary power regulation values ​​of at least two power distribution nodes are obtained, providing a flexible adjustment mechanism for the energy storage device in complex and ever-changing parallel power distribution environments. In the event of sudden power fluctuations or abnormal operating conditions, the secondary power regulation value allows the energy storage device to quickly adjust its power, maintaining its own safe and stable operation while continuously providing reliable power support to the photovoltaic-storage-charging system, extending the lifespan of the energy storage device, and reducing the risk of energy storage device failure. The secondary power regulation values ​​of at least two power distribution nodes are determined as the first target power regulation value for the energy storage device in the next time period. Therefore, the photovoltaic-storage-charging system of this application has stronger reliability and adaptability when facing complex parallel power distribution line conditions. It not only ensures the continuity and stability of power supply, but also enhances the adaptability of the photovoltaic-storage-charging system to different application scenarios and broadens the application scope of the photovoltaic-storage-charging system.

[0169] Figure 8 A flowchart illustrating a control method for a photovoltaic energy storage and charging system provided in this application embodiment. Figure 5 .like Figure 8 As shown, the above method for obtaining the secondary adjustment values ​​of energy storage power at at least two distribution nodes may include:

[0170] S701. Based on the energy storage power adjustment values ​​corresponding to at least two distribution nodes, the primary energy storage power adjustment value corresponding to the primary distribution node, and the preset number of distribution nodes, obtain the adjustment range of each distribution node.

[0171] The number of preset power distribution nodes n can be determined based on the specific number of poles of the multi-level power distribution line, and is not limited here.

[0172] In one possible implementation, the energy storage power regulation value P_set_des_n corresponding to at least two distribution nodes, the primary energy storage power regulation value P_set_des_total corresponding to the primary distribution node, and the preset number of distribution nodes n can be obtained according to the above formula (7). The regulation amplitude ΔP_set_des of each distribution node is calculated according to the following formula (16).

[0173]

[0174] Where n is a positive integer greater than 0. Formula (16)

[0175] S702. Based on the adjustment range of each power distribution node, the energy storage power adjustment value corresponding to at least two power distribution nodes, and the preset maximum output power value of the energy storage device, determine the secondary adjustment value of the energy storage power of at least two power distribution nodes.

[0176] In one possible implementation, the secondary regulation value P_send_des_n of the energy storage power of at least two distribution nodes is calculated and determined according to the following formula (17) based on the adjustment range ΔP_set_des of each distribution node, the energy storage power adjustment value P_set_des_n corresponding to at least two distribution nodes, and the preset maximum output power value P_max_des_n of the energy storage device.

[0177]

[0178] Where n is a positive integer greater than 0. Formula (17)

[0179] The control method for the photovoltaic-storage-charging system provided in this application obtains the adjustment range of each distribution node based on the energy storage power adjustment values ​​corresponding to at least two distribution nodes, the primary energy storage power adjustment value corresponding to the primary distribution node, and a preset number of distribution nodes. Based on the adjustment range of each distribution node, the energy storage power adjustment values ​​corresponding to at least two distribution nodes, and the preset maximum output power value of the energy storage device, a secondary adjustment value for the energy storage power of at least two distribution nodes is determined, which helps to achieve optimized energy allocation in the photovoltaic-storage-charging system. Under different time periods and operating conditions, the photovoltaic-storage-charging system can dynamically adjust the energy storage power according to the actual power demand of each distribution node and the available capacity of the energy storage device, thereby improving the energy utilization efficiency of the entire photovoltaic-storage-charging system and reducing its dependence on the external power grid. During the power adjustment process, the preset maximum output power value of the energy storage device fully considers the physical performance and safe operating limits of the energy storage device.

[0180] Optionally, the aforementioned target power distribution equipment may include: charging equipment. In one possible implementation embodiment, Figure 9 A flowchart illustrating a control method for a photovoltaic energy storage and charging system provided in this application embodiment. Figure 6 .like Figure 9 As shown, the method described above, which determines the target power adjustment value of the target distribution equipment in the next time period based on the real-time power of at least two distribution nodes, the preset power adjustment target of the target distribution equipment corresponding to at least two distribution nodes, and the real-time power of the target distribution equipment, may include:

[0181] S801. Based on the real-time power of at least two power distribution nodes, the power adjustment target of the preset charging equipment corresponding to at least two power distribution nodes, the real-time power of the energy storage device, and the preset maximum output power value of the energy storage device, determine whether the preset maximum output power value of the energy storage device meets the preset power distribution capacity expansion requirements when it is output.

[0182] In one possible implementation method, with Figure 1For example, the real-time power P_run_pcc1 of the primary power distribution node, the real-time power P_run_pcc2 of the secondary power distribution node, and the real-time power P_run_pcc3 of the tertiary power distribution node are obtained. The power adjustment targets P_con_pcc1_cha, P_con_pcc2_cha, and P_con_pcc3_cha of the preset energy storage devices corresponding to the primary, secondary, and tertiary power distribution nodes are also obtained. Simultaneously, the real-time power P_run_des and the preset maximum output power value P_max_des_n of the energy storage devices are obtained. It is then determined whether the preset maximum output power value of the energy storage devices meets the preset power distribution capacity expansion requirements. If the preset power distribution capacity expansion requirements are met, there is no need to limit the power of the charging equipment. If the preset power distribution capacity expansion requirements are not met, step S802 is executed.

[0183] S802. If the preset power distribution capacity expansion requirement is not met, then the second target power adjustment value of the charging device in the next time period shall be determined based on the real-time power of the charging device, the real-time power of at least two power distribution nodes, the preset charging power adjustment target corresponding to at least two power distribution nodes, the real-time power of the energy storage device, and the preset maximum output power value of the energy storage device.

[0184] In one possible implementation, if the preset power distribution capacity expansion requirement is not met, it means that the preset maximum output power value of the energy storage device does not meet the preset power distribution capacity expansion requirement. Then, based on the real-time power P_run_cha of the charging device, the real-time power P_run_pcc of at least two power distribution nodes, the preset charging power adjustment target P_con_pcc_des corresponding to at least two power distribution nodes, the real-time power P_run_des of the energy storage device, and the preset maximum output power value P_max_des_n of the energy storage device, the power of the charging device is first limited, and the power distribution value P_set_cha of the charging device is calculated according to the following formula (18).

[0185] P_set_cha = P_run_cha - Max

[0186] (P_run_pcc1-P_con_pcc1_cha-P_max_des_1-P_run_des_1, P_run_pcc2-P_con_pcc2_cha-P_max_des_2-P_run_des_2,…P_run_pccn-P_con_pccn_cha-P_max_des_n-P_run_des_n)

[0187] Where n is a positive integer greater than 0. Formula (18)

[0188] Then, the power distribution value P_set_cha of the charging device obtained by formula (19) is used as the second target power adjustment value P2_set_des_fin of the charging device in the next period.

[0189] It should be noted that, regardless of the above Figure 1 still Figure 2 The schematic diagram of the photovoltaic energy storage and charging system shown illustrates that when the target power distribution equipment is a charging equipment, the method for determining the second target power adjustment value of the charging equipment in the next time period is consistent. In both cases, the power limit of the charging equipment is considered only after the energy storage equipment has been adjusted to reach the preset maximum output power value P_max_des_n. Furthermore, the target power control within this power distribution node is given priority, and then the target power control value of the total power distribution node is considered.

[0190] Additionally, it should be noted that the preset maximum output power value P_max_des_n of the energy storage device is a positive value, representing the absolute value of the maximum discharge power of the energy storage device. If the energy storage device cannot discharge, the preset maximum output power value P_max_des_n is 0.

[0191] The control method for the photovoltaic-storage-charging system provided in this application targets the charging equipment as the power distribution equipment. Based on the real-time power of at least two power distribution nodes, the power adjustment target of the preset charging equipment corresponding to at least two power distribution nodes, the real-time power of the energy storage equipment, and the preset maximum output power value of the energy storage equipment, it determines whether the preset maximum output power value of the energy storage equipment meets the preset power distribution capacity expansion requirements when it is output. This ensures that in the photovoltaic-storage-charging system, when faced with an increase in electricity demand, the system is able to assess whether the existing power resources can meet the capacity expansion requirements, thereby ensuring the stability of the photovoltaic-storage-charging system under capacity expansion scenarios such as peak electricity consumption. If the preset power distribution capacity expansion requirements are not met, the second target power adjustment value of the charging equipment in the next time period is determined based on the real-time power of the charging equipment, the real-time power of at least two power distribution nodes, the preset charging power adjustment targets corresponding to at least two power distribution nodes, the real-time power of the energy storage equipment, and the preset maximum output power value of the energy storage equipment. This allows for precise adjustment of the charging equipment power according to the actual power status of the photovoltaic-energy storage-charging system, preventing the photovoltaic-energy storage-charging system from collapsing due to overcharging, while ensuring that the charging equipment operates at an appropriate power to meet some charging needs and improve the overall reliability and stability of the photovoltaic-energy storage-charging system.

[0192] Figure 10 A flowchart illustrating a control method for a photovoltaic energy storage and charging system provided in this application embodiment. Figure 7 .like Figure 10As shown, the above method, based on the real-time power of at least two distribution nodes, the preset charging power adjustment target corresponding to at least two distribution nodes, the real-time power of the energy storage device, and the preset maximum output power value of the energy storage device, determines whether the preset maximum output power value of the energy storage device meets the preset power distribution capacity expansion requirements when outputting. This may include:

[0193] S901. Based on the real-time power of at least two power distribution nodes, the preset charging power adjustment target corresponding to at least two power distribution nodes, the real-time power of the energy storage device, and the preset maximum output power value of the energy storage device, determine the charging power adjustment value corresponding to at least two power distribution nodes respectively.

[0194] In one possible implementation, based on the real-time power P_run_pcc of at least two power distribution nodes, the preset charging power adjustment target P_con_pccn_cha corresponding to at least two power distribution nodes, the real-time power P_run_des of the energy storage device, and the preset maximum output power value P_max_des_n of the energy storage device, the charging power adjustment value P_set_cha_pccn corresponding to at least two power distribution nodes is determined according to the following formula (19).

[0195] P_set_cha_pccn=P_run_pccn-P_con_pccn_cha-(P_max_des_n+P_run_des_n)

[0196] Where n is a positive integer greater than 0. Formula (19)

[0197] Wherein, P_con_pccn_cha is the power adjustment target value of the charging equipment at the main power collection point of the n-level power distribution line; P_con_pccn_cha is the power adjustment target value of the charging equipment at the power collection point of the n-level power distribution line.

[0198] S902. Determine whether the maximum power adjustment value among the charging power adjustment values ​​corresponding to at least two power distribution nodes is greater than or equal to the preset minimum power value.

[0199] The preset minimum power value can be selected according to actual conditions. For example, the preset minimum power value can be selected as 0KW.

[0200] In one possible implementation, the maximum power regulation value MAX among the charging power regulation values ​​corresponding to at least two distribution nodes is determined according to the following formula (20) to be greater than or equal to a preset minimum power value (e.g., 0KW).

[0201] Max(P_run_pcc1-P_con_pcc1_cha-(P_max_des_1+P_run_des_1), P_run_pcc2-P_con_pcc2_cha-(P_max_des_2+P_run_des_2),…P_run_pccn-P_con_pccn_cha-(P_max_des_n+P_run_des_n))>=0

[0202] Where n is a positive integer greater than 0. Formula (20)

[0203] S903. If the maximum power adjustment value is greater than or equal to the preset minimum power value, it is determined that the preset power distribution capacity expansion requirement is not met.

[0204] In one possible implementation, if the maximum power regulation value MAX is greater than or equal to the preset minimum power value (e.g., 0KW), it is determined that the preset power distribution capacity expansion requirement is not met. This means that when the energy storage device outputs the preset maximum output power value, the preset power distribution capacity expansion requirement is not met, and the power of the charging device needs to be limited.

[0205] S904. If the maximum power adjustment value is less than the preset minimum power value, then the preset power distribution capacity expansion requirement is met.

[0206] In one possible implementation, if the maximum power regulation value MAX is less than the preset minimum power value (e.g., 0KW), then the preset power distribution capacity expansion requirement is met, meaning that there is no need to limit the power of the charging equipment.

[0207] This application provides a control method for a photovoltaic-storage-charging system. Based on the real-time power of at least two distribution nodes, the preset charging power adjustment targets corresponding to at least two distribution nodes, the real-time power of the energy storage device, and the preset maximum output power value of the energy storage device, the method determines the charging power adjustment values ​​corresponding to at least two distribution nodes. This provides a comprehensive data foundation for accurately assessing the power distribution capacity expansion requirements. Different distribution nodes have varying power conditions due to factors such as load distribution and photovoltaic grid connection. Through this detailed calculation, the photovoltaic-storage-charging system can accurately grasp the power change trends of each distribution node, thereby accurately determining whether the current power resources of the photovoltaic-storage-charging system can meet the preset power distribution capacity expansion requirements, providing a reliable basis for subsequent decision-making. The method determines whether the maximum power adjustment value among the charging power adjustment values ​​corresponding to at least two distribution nodes is greater than or equal to the preset minimum power value. If the maximum power adjustment value is greater than or equal to the preset minimum power value, it is determined that the preset power distribution capacity expansion requirements are not met; if the maximum power adjustment value is less than the preset minimum power value, it is determined that the preset power distribution capacity expansion requirements are met. Therefore, the photovoltaic-storage-charging system of this application can promptly detect potential power shortage problems. When the maximum power adjustment value is greater than or equal to the preset minimum power value, it is determined that the preset power distribution capacity expansion requirement is not met. The photovoltaic-storage-charging system can take measures in advance, such as adjusting the power of the charging equipment and optimizing the charging and discharging strategy of the energy storage equipment, to avoid the photovoltaic-storage-charging system from collapsing due to power overload, ensure the stable operation of the photovoltaic-storage-charging system under various operating conditions, reduce the probability of power outage accidents, and improve the reliability of power supply.

[0208] Optionally, the method described above, which determines whether the preset maximum output power of the energy storage device meets the preset power distribution capacity expansion requirement when outputting based on the real-time power of at least two distribution nodes, the preset charging power adjustment target corresponding to at least two distribution nodes, the real-time power of the energy storage device, and the preset maximum output power value of the energy storage device, may further include:

[0209] If the preset power distribution capacity expansion requirement is met, the second target power adjustment value of the charging equipment in the next time period is determined based on the charging power demand of the equipment to be charged connected to the charging equipment.

[0210] In one possible implementation, if the preset power distribution capacity expansion requirement is met, it means that there is no need to limit the power of the charging equipment. The second target power adjustment value P2_set_des_fin of the charging equipment in the next time period can be determined according to the charging demand power P_run_need of the equipment to be charged connected to the charging equipment, that is, P2_set_des_fin = P_run_need.

[0211] This application provides a control method for a photovoltaic energy storage and charging system. If a preset power distribution capacity expansion requirement is met, a second target power adjustment value for the charging device in the next time period is determined based on the charging power demand of the device to be charged connected to the charging device. Therefore, this application can determine the second target power adjustment value based on the charging power demand of the device to be charged, enabling the charging device to accurately adapt to the actual needs of the device to be charged, ensuring that the device to be charged is charged at the optimal power, thus improving charging efficiency and avoiding the risk of excessively long charging times or equipment damage due to power mismatch.

[0212] To facilitate understanding of the control method of the above-mentioned photovoltaic energy storage and charging system, Figure 1 For example, this application also provides a flowchart of a control method for a photovoltaic energy storage and charging system, which will be further described below with reference to the accompanying drawings. Figure 11 A flowchart illustrating a control method for a photovoltaic energy storage and charging system provided in this application embodiment. Figure 8 .like Figure 11 As shown in the illustration, the embodiments provided in this application provide... Figure 8 It may include:

[0213] S1001. Obtain the real-time power of at least two power distribution nodes and the preset energy storage power adjustment target in the photovoltaic-energy storage-charging system, as well as the real-time power of the energy storage device and the real-time power of the charging device.

[0214] Specifically, the microgrid controller adjusts the target P_con_pcc based on the real-time power P_run_pcc of at least two power distribution nodes and the power of the preset target power distribution equipment corresponding to at least two power distribution nodes. At the same time, it acquires the real-time power P_run_des of the energy storage device and the real-time power P_run_cha of the charging device to understand the power status of each power distribution node, energy storage device and charging device, so as to provide a data basis for subsequent control.

[0215] S1002. Based on the real-time power of at least two power distribution nodes in the photovoltaic-storage-charging system and the preset energy storage power adjustment target, as well as the real-time power of the energy storage device, determine the energy storage power adjustment value corresponding to at least two power distribution nodes respectively.

[0216] Specifically, based on the real-time power P_run_pcc of at least two power distribution nodes in the photovoltaic-storage-charging system and the preset energy storage power adjustment target P_con_pcc, as well as the real-time power P_run_des of the energy storage device, the energy storage power adjustment value P_set_des_pcc corresponding to at least two power distribution nodes is determined according to the above formula (1).

[0217] S1003, Calculate the first target power adjustment value of the energy storage device in the next time period.

[0218] Specifically, if the relevant factors of peak, flat and valley periods are not considered, the minimum power regulation value in the energy storage power regulation value P_set_des_pcc corresponding to at least two distribution nodes is determined according to the above formula (2) to be the first target power regulation value P1_set_des_fin of the energy storage device in the next period.

[0219] If the relevant factors of peak, flat and valley periods are taken into account, the minimum power regulation value in the energy storage power regulation value P_set_des_pcc corresponding to at least two distribution nodes is determined according to the above formula (3) to be the first target power regulation value P1_set_des_fin of the energy storage device in the next period.

[0220] S1004. Determine whether the preset maximum output power value of the energy storage device meets the preset power distribution capacity expansion requirements when it is output, and calculate the first target power adjustment value of the charging device in the next time period.

[0221] Specifically, based on the real-time power P_run_pcc of at least two power distribution nodes in the photovoltaic-storage-charging system and the preset energy storage power adjustment target P_con_pcc, as well as the real-time power P_run_cha of the charging device, the preset maximum output power value P_max_des_n of the energy storage device is determined according to the above formula (20) to determine whether the preset power distribution capacity increase requirement is met when the device outputs.

[0222] If the maximum power adjustment value MAX is greater than or equal to the preset minimum power value (e.g., 0KW), it is determined that the preset power distribution capacity expansion requirement is not met. This means that when the preset maximum output power value of the energy storage device is output, the preset power distribution capacity expansion requirement is not met. Therefore, the power of the charging device needs to be limited according to the above formula (18).

[0223] If the maximum power adjustment value MAX is less than the preset minimum power value (e.g., 0KW), then the preset power distribution capacity expansion requirement is met, which means that there is no need to limit the power of the charging equipment. Then, the second target power adjustment value P2_set_des_fin of the charging equipment in the next time period can be determined according to the charging demand power P_run_need of the equipment to be charged connected to the charging equipment, that is, P2_set_des_fin=P_run_need.

[0224] For example, Figure 12 This is a schematic diagram of the operating power curves of various parts under multi-node target control in a photovoltaic energy storage and charging system provided in an embodiment of this application. Figure 12 Therefore Figure 1 For example, the power curves of various power distribution nodes and energy storage and charging equipment during off-peak hours are obtained. Figure 12 As shown, at time T1, the load on the primary distribution line suddenly increases, and the total distribution data collection point (such as...) Figure 1When the real-time power P_run_pcc1 of 110-1 exceeds the power regulation target P_con_pcc1_des, the energy storage device begins to respond and adjust according to the control method of the photovoltaic-energy storage-charging system provided in this application, dynamically adjusting and reducing the charging power of the energy storage device to meet the target control power of each distribution node. At time T2, the load of the primary distribution line has returned to its previous state, and the energy storage device begins to respond and adjust according to the control method of the photovoltaic-energy storage-charging system, dynamically adjusting and increasing the charging power of the energy storage device to meet the target control power of each distribution node. At other times T3, T4, T5, and T6, when the load of the secondary distribution line suddenly increases and recovers, respectively, the energy storage device dynamically adjusts according to the control method of the photovoltaic-energy storage-charging system. At time T7, the loads of the primary, secondary, and tertiary distribution lines all suddenly increase simultaneously, causing the real-time power of each node to exceed its corresponding power regulation target P_con_pcc. At this time, the energy storage device begins to respond and adjust according to the control method of the photovoltaic-energy storage-charging system. The system performs response adjustments, dynamically regulating the operating power of the energy storage device to meet the target control power of each distribution node. At time T8, the load on the primary distribution line has increased, exceeding the preset maximum output power value P_max_des_n that the energy storage device can adjust. At this time, the charging device also starts power-limiting operation. At time T9, the load on the primary distribution line has decreased, and the real-time power of each distribution node is less than its corresponding power adjustment target P_con_pcc. The charging device releases the power-limiting state, and the energy storage device also adjusts its operating power value simultaneously to ensure the operation of the charging device while meeting the target control power of each distribution node.

[0225] It should be noted that the control method for the photovoltaic energy storage and charging system provided in this application is not limited to the above-mentioned case in actual project applications.

[0226] This application provides a control method for a photovoltaic-storage-charging system. It acquires the real-time power of at least two power distribution nodes and a preset energy storage power adjustment target, as well as the real-time power of the energy storage device and the charging device. Based on the real-time power of the at least two power distribution nodes, the preset energy storage power adjustment target, and the real-time power of the energy storage device, it determines the energy storage power adjustment value corresponding to each of the at least two power distribution nodes, calculates the first target power adjustment value of the energy storage device in the next time period, determines whether the preset maximum output power value of the energy storage device meets the preset power distribution capacity expansion requirement, and calculates the first target power adjustment value of the charging device in the next time period. Therefore, by setting different target power adjustment values ​​for the energy storage device and the charging device, this application achieves hierarchical control response for multiple devices. Under conditions of significant load fluctuations, it prioritizes adjusting the output power of the energy storage device. If the preset maximum output power value of the energy storage device is exceeded, the power of the charging device is then limited, avoiding power oscillation problems during the adjustment of the photovoltaic-storage-charging system. In addition, this application can also compare and analyze the power control targets and actual power values ​​of each power distribution node, calculate the power regulation values ​​of energy storage devices and charging devices that can meet the power regulation targets of each power distribution node, and then calculate and analyze the power regulation values ​​of multiple energy storage devices and charging devices, select the target power regulation value that can meet the power regulation targets of all power distribution nodes and issue it, thus ensuring the power distribution safety of each part of the photovoltaic energy storage and charging system.

[0227] Based on the same inventive concept, this application also provides a control device for an optical storage and charging system. Since the principle of the device in this application is similar to the control method of the optical storage and charging system described above in this application, the implementation of the device can refer to the implementation of the method, and the repeated parts will not be described again.

[0228] Figure 13 This is a schematic diagram of the structure of a control device for an optical energy storage and charging system provided in an embodiment of this application. Figure 13 As shown, the photovoltaic energy storage and charging system includes: multi-level power distribution lines; wherein, each power distribution line in the multi-level power distribution lines is equipped with a power distribution node and a corresponding power distribution acquisition point; the target power distribution line in the multi-level power distribution lines is electrically connected to each power distribution device; the control device 1100 of the photovoltaic energy storage and charging system may include: an acquisition module 1110 and a control module 1120.

[0229] The acquisition module 1110 is used to acquire the real-time power of at least two power distribution nodes in the photovoltaic energy storage and charging system and the real-time power of the target power distribution equipment, wherein each power distribution node is located on a power distribution line where the target power distribution equipment is located;

[0230] The control module 1120 is used to control the power of the target power distribution equipment based on the real-time power of at least two power distribution nodes, the preset energy storage power adjustment target corresponding to at least two power distribution nodes, and the real-time power of the target power distribution equipment.

[0231] In one optional implementation, the target power distribution equipment includes: an energy storage device and / or a charging device; the control module 1120 is specifically used to: determine the target power adjustment value of the target power distribution equipment in the next time period based on the real-time power of at least two power distribution nodes, the preset power adjustment target of the target power distribution equipment corresponding to at least two power distribution nodes, and the real-time power of the target power distribution equipment; and perform power control on the target power distribution equipment based on the target power adjustment value.

[0232] In one optional implementation, the multi-level power distribution line includes: a multi-level power distribution line connected in series; the target power distribution equipment includes: an energy storage device; the control module 1120 may include: a first determining module 1121, which is specifically used to: determine the energy storage power adjustment value corresponding to at least two power distribution nodes based on the real-time power of at least two power distribution nodes, the preset power adjustment target of the energy storage device corresponding to at least two power distribution nodes, and the real-time power of the energy storage device; if the control strategy of the energy storage device in the next time period is a dynamic capacity expansion strategy of charging and discharging, then determine the minimum power adjustment value as the first target power adjustment value of the energy storage device in the next time period based on the energy storage power adjustment value corresponding to at least two power distribution nodes; if the control strategy of the energy storage device in the next time period is a dynamic capacity expansion strategy of discharging only, then determine the minimum power adjustment value as the first target power adjustment value of the energy storage device in the next time period based on the energy storage power adjustment value corresponding to at least two power distribution nodes and the preset minimum power value.

[0233] In one optional implementation, at least one target-level distribution line in the multi-level distribution line is a series of parallel distribution lines; the target power distribution equipment includes: an energy storage device; the first determining module 1121 is specifically used to: determine the energy storage power adjustment value corresponding to at least two distribution nodes based on the real-time power of at least two distribution nodes, the preset power adjustment target of the energy storage device corresponding to at least two distribution nodes, and the real-time power of the energy storage device; and determine the first-level energy storage power corresponding to the first-level distribution node based on the energy storage power adjustment value corresponding to at least two distribution nodes, the real-time power and power adjustment target of the first-level distribution node corresponding to the energy storage device. The adjustment value is calculated based on the energy storage power adjustment values ​​of at least two distribution nodes. The total energy storage power adjustment value is then determined based on the total energy storage power adjustment value and the primary energy storage power adjustment value. It is then determined whether the energy storage power adjustment values ​​corresponding to at least two distribution nodes meet the preset power distribution requirements. If the preset power distribution requirements are met, the maximum value among the energy storage power adjustment values ​​of the at least two distribution nodes is determined as the first target power adjustment value for the energy storage device in the next time period. If the preset power distribution requirements are not met, the secondary energy storage power adjustment values ​​of the at least two distribution nodes are obtained. Finally, the secondary energy storage power adjustment values ​​of the at least two distribution nodes are determined as the first target power adjustment value for the energy storage device in the next time period.

[0234] In one optional implementation, the first determining module 1121 is specifically used to: obtain the adjustment range of each power distribution node based on the energy storage power adjustment value corresponding to at least two power distribution nodes, the primary energy storage power adjustment value corresponding to the primary power distribution node, and the preset number of power distribution nodes; and determine the secondary adjustment value of the energy storage power of at least two power distribution nodes based on the adjustment range of each power distribution node, the energy storage power adjustment value corresponding to at least two power distribution nodes, and the preset maximum output power value of the energy storage device.

[0235] In one optional implementation, the target power distribution equipment includes: a charging device; and a first determining module 1121, specifically configured to: determine whether the preset maximum output power value of the energy storage device meets the preset power distribution capacity expansion requirement when outputting, based on the real-time power of at least two power distribution nodes, the preset power adjustment target of the charging device corresponding to at least two power distribution nodes, the real-time power of the energy storage device, and the preset maximum output power value of the energy storage device; if the preset power distribution capacity expansion requirement is not met, then determine the second target power adjustment value of the charging device in the next time period based on the real-time power of the charging device, the real-time power of at least two power distribution nodes, the preset charging power adjustment target corresponding to at least two power distribution nodes, the real-time power of the energy storage device, and the preset maximum output power value of the energy storage device.

[0236] In one optional implementation, the control module 1120 may include a second determining module 1122, which is specifically configured to: determine charging power adjustment values ​​corresponding to at least two power distribution nodes based on the real-time power of at least two power distribution nodes, preset charging power adjustment targets corresponding to at least two power distribution nodes, the real-time power of the energy storage device, and the preset maximum output power value of the energy storage device; determine whether the maximum power adjustment value among the charging power adjustment values ​​corresponding to at least two power distribution nodes is greater than or equal to a preset minimum power value; if the maximum power adjustment value is greater than or equal to the preset minimum power value, determine that the preset power distribution capacity expansion requirement is not met; if the maximum power adjustment value is less than the preset minimum power value, determine that the preset power distribution capacity expansion requirement is met.

[0237] In one optional implementation, the second determining module 1122 is further configured to: if the preset power distribution capacity expansion requirement is met, determine the second target power adjustment value of the charging device in the next time period based on the charging power demand of the device to be charged connected to the charging device.

[0238] It should be noted that for details not disclosed in the control device of the optical storage and charging system in the embodiments of this application, please refer to the details disclosed in the control method of the optical storage and charging system in the embodiments of this application, which will not be repeated here.

[0239] These modules can be one or more integrated circuits configured to implement the above methods, such as one or more Application Specific Integrated Circuits (ASICs), one or more microprocessors, or one or more Field Programmable Gate Arrays (FPGAs). Alternatively, when a module is implemented using processing element scheduler code, the processing element can be a general-purpose processor, such as a Central Processing Unit (CPU) or other processor capable of calling program code. Furthermore, these modules can be integrated together as a system-on-a-chip (SOC).

[0240] Optionally, embodiments of this application also provide a readable storage medium storing a computer program. When the computer program is run by a processor, the processor executes the steps of the control method for the optical storage and charging system of the mobile storage medium in the above embodiments. The specific implementation and technical effects are similar and will not be described again here.

[0241] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The integrated unit described above can be implemented in hardware or in the form of hardware plus software functional units.

[0242] The integrated units implemented as software functional units described above can be stored in a computer-readable storage medium. These software functional units, stored in a storage medium, include several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute some steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0243] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A control method for a photovoltaic energy storage and charging system, characterized in that, The photovoltaic energy storage and charging system includes: a multi-level power distribution line; wherein, each power distribution line in the multi-level power distribution line is equipped with a power distribution node and a corresponding power distribution acquisition point; the target power distribution line in the multi-level power distribution line is electrically connected to each power distribution device; the method includes: The real-time power of at least two power distribution nodes and the real-time power of the target power distribution equipment in the photovoltaic energy storage and charging system are obtained, wherein each power distribution node is located on a power distribution line where the target power distribution equipment is located; Power control is performed on the target power distribution equipment based on the real-time power of the at least two power distribution nodes, the preset power adjustment target of the target power distribution equipment corresponding to the at least two power distribution nodes, and the real-time power of the target power distribution equipment. The target power distribution equipment includes: energy storage equipment and / or charging equipment; the power control of the target power distribution equipment based on the real-time power of the at least two power distribution nodes, the preset power adjustment target of the target power distribution equipment corresponding to the at least two power distribution nodes, and the real-time power of the target power distribution equipment includes: Based on the real-time power of the at least two distribution nodes, the preset power adjustment target of the target distribution equipment corresponding to the at least two distribution nodes, and the real-time power of the target distribution equipment, the target power adjustment value of the target distribution equipment in the next time period is determined; The target power distribution equipment is controlled according to the target power adjustment value.

2. The control method for the photovoltaic energy storage and charging system according to claim 1, characterized in that, The multi-level power distribution line includes: a multi-level power distribution line connected in series; the target power distribution equipment includes: an energy storage device; the preset power adjustment target of the target power distribution equipment includes: the preset power adjustment target of the energy storage device; determining the target power adjustment value of the target power distribution equipment in the next time period based on the real-time power of the at least two power distribution nodes, the preset power adjustment target of the target power distribution equipment corresponding to the at least two power distribution nodes, and the real-time power of the target power distribution equipment includes: Based on the real-time power of the at least two power distribution nodes, the preset power adjustment target of the energy storage device corresponding to the at least two power distribution nodes, and the real-time power of the energy storage device, the energy storage power adjustment value corresponding to the at least two power distribution nodes is determined respectively. If the control strategy of the energy storage device in the next time period is a dynamic capacity expansion strategy of charging and discharging, then the minimum power adjustment value is determined as the first target power adjustment value of the energy storage device in the next time period based on the energy storage power adjustment values ​​corresponding to the at least two power distribution nodes. If the control strategy of the energy storage device in the next time period is a dynamic capacity expansion strategy with only discharge, then the minimum power adjustment value is determined as the first target power adjustment value of the energy storage device in the next time period based on the energy storage power adjustment values ​​corresponding to the at least two power distribution nodes and the preset minimum power value.

3. The control method for the photovoltaic energy storage and charging system according to claim 1, characterized in that, At least one target-level power distribution line in the multi-level power distribution line is a series of power distribution lines connected in parallel; The target power distribution equipment includes: an energy storage device; the preset power adjustment target of the target power distribution equipment includes: the preset power adjustment target of the energy storage device; determining the target power adjustment value of the target power distribution equipment in the next time period based on the real-time power of the at least two power distribution nodes, the preset power adjustment target of the target power distribution equipment corresponding to the at least two power distribution nodes, and the real-time power of the target power distribution equipment includes: Based on the real-time power of the at least two power distribution nodes, the preset power adjustment target of the energy storage device corresponding to the at least two power distribution nodes, and the real-time power of the energy storage device, the energy storage power adjustment value corresponding to the at least two power distribution nodes is determined respectively. Based on the energy storage power adjustment values ​​corresponding to the at least two power distribution nodes, and the real-time power and preset power adjustment target of the primary power distribution node corresponding to the energy storage device, the primary energy storage power adjustment value corresponding to the primary power distribution node is determined. Calculate the total energy storage power adjustment value based on the energy storage power adjustment values ​​of the at least two power distribution nodes; Based on the total energy storage power adjustment value and the first-level energy storage power adjustment value, determine whether the energy storage power adjustment values ​​corresponding to the at least two power distribution nodes meet the preset power distribution requirements; If the preset power distribution requirements are met, the maximum value among the energy storage power adjustment values ​​of the at least two power distribution nodes is determined as the first target power adjustment value of the energy storage device in the next time period; If the preset power distribution requirements are not met, obtain the secondary adjustment values ​​of the energy storage power of the at least two power distribution nodes; The secondary adjustment value of the energy storage power of the at least two power distribution nodes is determined to be the first target power adjustment value of the energy storage device in the next time period.

4. The control method for the photovoltaic energy storage and charging system according to claim 3, characterized in that, The process of obtaining the secondary adjustment values ​​of the energy storage power of the at least two distribution nodes includes: The adjustment range of each power distribution node is obtained based on the energy storage power adjustment value corresponding to the at least two power distribution nodes, the primary energy storage power adjustment value corresponding to the primary power distribution node, and the preset number of power distribution nodes. The secondary adjustment value of the energy storage power of the at least two power distribution nodes is determined based on the adjustment range of each power distribution node, the energy storage power adjustment value corresponding to the at least two power distribution nodes, and the preset maximum output power value of the energy storage device.

5. The control method for the photovoltaic energy storage and charging system according to claim 1, characterized in that, The target power distribution equipment includes: charging equipment; the preset power adjustment target of the target power distribution equipment includes: the preset power adjustment target of the charging equipment; determining the target power adjustment value of the target power distribution equipment in the next time period based on the real-time power of the at least two power distribution nodes, the preset power adjustment target of the target power distribution equipment corresponding to the at least two power distribution nodes, and the real-time power of the target power distribution equipment includes: Based on the real-time power of the at least two power distribution nodes, the preset power adjustment target of the charging equipment corresponding to the at least two power distribution nodes, the real-time power of the energy storage device, and the preset maximum output power value of the energy storage device, determine whether the preset maximum output power value of the energy storage device meets the preset power distribution capacity expansion requirements when it is output. If the preset power distribution capacity expansion requirement is not met, then the second target power adjustment value of the charging device in the next time period is determined based on the real-time power of the charging device, the real-time power of the at least two power distribution nodes, the preset power adjustment target of the charging device corresponding to the at least two power distribution nodes, the real-time power of the energy storage device, and the preset maximum output power value of the energy storage device.

6. The control method for the photovoltaic energy storage and charging system according to claim 5, characterized in that, The step of determining whether the preset maximum output power value of the energy storage device meets the preset power distribution capacity expansion requirement when outputting, based on the real-time power of the at least two power distribution nodes, the preset power adjustment target of the charging equipment corresponding to the at least two power distribution nodes, the real-time power of the energy storage device, and the preset maximum output power value of the energy storage device, includes: Based on the real-time power of the at least two power distribution nodes, the preset power adjustment target of the charging equipment corresponding to the at least two power distribution nodes, the real-time power of the energy storage device, and the preset maximum output power value of the energy storage device, the charging power adjustment value corresponding to the at least two power distribution nodes is determined respectively. Determine whether the maximum power adjustment value among the charging power adjustment values ​​corresponding to the at least two power distribution nodes is greater than or equal to the preset minimum power value; If the maximum power adjustment value is greater than or equal to the preset minimum power value, then it is determined that the preset power distribution capacity expansion requirement is not met. If the maximum power adjustment value is less than the preset minimum power value, then the preset power distribution capacity expansion requirement is met.

7. The control method for the photovoltaic energy storage and charging system according to claim 6, characterized in that, The step of determining whether the preset maximum output power value of the energy storage device meets the preset power distribution capacity expansion requirement when outputting, based on the real-time power of the at least two power distribution nodes, the preset power adjustment target of the charging equipment corresponding to the at least two power distribution nodes, the real-time power of the energy storage device, and the preset maximum output power value of the energy storage device, further includes: If the preset power distribution capacity expansion requirement is met, then the second target power adjustment value of the charging device in the next time period is determined according to the charging power demand of the device to be charged connected to the charging device.

8. A microgrid controller, characterized in that, include: The system includes a processor, a storage medium, and a bus. The storage medium stores machine-readable instructions executable by the processor. When the microgrid controller is running, the processor communicates with the storage medium via the bus, and the processor executes the machine-readable instructions to perform the steps of the control method for the optical storage and charging system as described in any one of claims 1 to 7.

9. A photovoltaic energy storage and charging system, characterized in that, include: The microgrid controller, transformer substation, multi-level power distribution line, and power distribution equipment as described in claim 8; The transformer in the distribution area is connected to the multi-level power distribution line; wherein the multi-level power distribution line is a series multi-level power distribution line, or at least one target-level power distribution line in the multi-level power distribution line is a series of multiple power distribution lines connected in parallel; Each distribution line in the multi-level power distribution line is equipped with a power distribution node and a corresponding power acquisition point; the target power distribution line in the multi-level power distribution line is electrically connected to the power distribution equipment, and the microgrid controller is communicatively connected to the power acquisition point corresponding to each power distribution node and the power distribution equipment to obtain their respective real-time power and control the power distribution equipment; the power distribution equipment includes: photovoltaic equipment, energy storage equipment and charging equipment; The microgrid controller is used to execute the control method of the optical storage and charging system according to any one of claims 1 to 7.

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