Control method of optical storage and charging system, micro-grid controller and optical storage and charging system

Abstract

The invention relates to the technical field of power electronics, and discloses a control method of an optical storage and charging system, a micro-grid controller and the optical storage and charging system. The optical storage and charging system comprises a multi-stage distribution line; power distribution nodes and corresponding power distribution acquisition points are arranged on each power distribution line in the multiple stages of power distribution lines; a target power distribution line in the multi-stage power distribution line is electrically connected with each power distribution device; the method comprises the following steps: acquiring real-time power of at least two power distribution nodes in the optical storage and charging system and real-time power of target power distribution equipment; and performing power control on the target power distribution equipment according to 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. By setting the preset energy storage power adjustment targets of different power distribution nodes, the control of the multi-stage power distribution line is realized, and the output power of the power distribution equipment is adjusted in time under the condition that the load fluctuates greatly, so that the problem of power oscillation of the optical storage and charging system is avoided.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular, to a control method for a photovoltaic energy storage charging system, a microgrid controller, and a photovoltaic energy storage charging system. Background Art

[0002] With the rapid development of the new energy vehicle industry, its sales volume has increased exponentially, and the scale of the supporting charging infrastructure has also increased year by year. The resulting power capacity demand has had a significant impact on the traditional power grid. At the same time, the demand of new energy vehicle owners for supercharging is rapidly rising, and the era of supercharging has arrived. It is urgent to add supercharging equipment to traditional charging stations. However, the large-scale construction of charging infrastructure and the transformation of charging stations have caused a strong impact and heavy burden on the existing power grid. Problems such as difficult capacity expansion of charging stations, high investment costs, and numerous uncertainties have emerged one after another.

[0003] Currently, a cooperative control strategy for a photovoltaic energy storage charging system is mostly adopted, that is, by dynamically adjusting the charge and discharge power of energy storage devices and the power limit value of charging devices to alleviate the problem of difficult capacity expansion of charging stations.

[0004] However, in practical applications, there are still some problems in the existing technology. For example, on the one hand, the large fluctuations in charging load may cause the energy storage battery and the charging device to simultaneously implement power limitation when the load suddenly surges, thereby causing unstable fluctuations in the operating power of the system; on the other hand, the existing solutions often ignore the power management of specific distribution lines and power collection points on each level of distribution lines in the photovoltaic energy storage charging system, making the operation of the photovoltaic energy storage charging system potentially risky. Summary of the Invention

[0005] The purpose of the embodiments of the present application is to provide a control method for a photovoltaic energy storage charging system, a microgrid controller, and a photovoltaic energy storage charging system to solve the problem of power oscillation during the operation of the existing photovoltaic energy storage charging system.

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

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

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

[0009] Perform power control on the target power distribution device according to the real-time power of the at least two power distribution nodes, the preset energy storage power regulation target corresponding to the at least two power distribution nodes, and the real-time power of the target power distribution device.

[0010] Optionally, the target power distribution device includes: an energy storage device and / or a charging device; the performing power control on the target power distribution device according to the real-time power of the at least two power distribution nodes, the preset energy storage power regulation target corresponding to the at least two power distribution nodes, and the real-time power of the target power distribution device includes:

[0011] Determine the target power regulation value of the target power distribution device in the next time period according to the real-time power of the at least two power distribution nodes, the preset power regulation target of the target power distribution device corresponding to the at least two power distribution nodes, and the real-time power of the target power distribution device;

[0012] Perform power control on the target power distribution device according to the target power regulation value.

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

[0014] Respectively determine the energy storage power regulation values corresponding to the at least two power distribution nodes according to the real-time power of the at least two power distribution nodes, the preset energy storage device power regulation target corresponding to the at least two power distribution nodes, and the real-time power of the energy storage device;

[0015] If the control strategy of the energy storage device in the next time period is a charge-discharge dynamic capacity increase strategy, then determine the minimum power regulation value as the first target power regulation value of the energy storage device in the next time period according to the energy storage power regulation 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 only-discharge dynamic capacity increase strategy, then determine the minimum power regulation value as the first target power regulation value of the energy storage device in the next time period according to the energy storage power regulation values corresponding to the at least two power distribution nodes and a preset minimum power value.

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

[0018] According to the real-time power of the at least two distribution nodes, the power adjustment target of the preset energy storage device corresponding to the at least two distribution nodes, and the real-time power of the energy storage device, respectively determine the energy storage power adjustment values corresponding to the at least two distribution nodes;

[0019] According to the energy storage power adjustment values corresponding to the 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, determine the primary energy storage power adjustment value corresponding to the primary distribution node;

[0020] Calculate the total energy storage power adjustment value according to the energy storage power adjustment values of the at least two distribution nodes;

[0021] According to the total energy storage power adjustment value and the primary energy storage power adjustment value, determine whether the energy storage power adjustment values corresponding to the at least two distribution nodes meet the preset power distribution requirements;

[0022] If the preset power distribution requirements are met, determine the maximum value among the energy storage power adjustment values of the at least two distribution nodes 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 energy storage power adjustment values of the at least two distribution nodes;

[0024] Determine the secondary energy storage power adjustment values of the at least two distribution nodes as the first target power adjustment value of the energy storage device in the next time period.

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

[0026] According to the energy storage power adjustment values corresponding to the 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 amplitude of each distribution node;

[0027] According to the adjustment amplitude of each distribution node, the energy storage power adjustment values corresponding to the at least two distribution nodes, and the preset power adjustment target of the energy storage device, determine the secondary energy storage power adjustment values of the at least two distribution nodes.

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

[0029] According to the real-time power of the at least two power distribution nodes, the power adjustment target of the preset 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, determine whether the preset maximum output power value of the energy storage device meets the preset power distribution capacity increase requirement when output;

[0030] If the preset power distribution capacity increase requirement is not met, then according to 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, determine the second target power adjustment value of the charging device in the next time period.

[0031] Optionally, determining whether the preset maximum output power value of the energy storage device meets the preset power distribution capacity increase requirement when output according to 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] According to 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, respectively determine the charging power adjustment values corresponding to the at least two power distribution nodes;

[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 a preset minimum power value;

[0034] If the maximum power adjustment value is greater than or equal to the preset minimum power value, then determine that the preset power distribution capacity increase requirement is not met;

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

[0036] Optionally, determining whether the preset maximum output power value of the energy storage device meets the preset power distribution capacity increase requirement when outputting the preset maximum output power value of the energy storage device according to 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 increase requirement is met, determine the second target power adjustment value of the charging device in the next time period according to the charging demand power of the device to be charged connected to the charging device.

[0038] In a second aspect, an embodiment of the present application provides 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 runs, the processor communicates with the storage medium through the bus. The processor executes the machine-readable instructions to perform the steps of the control method of the photovoltaic energy storage charging system according to any one of the first aspects.

[0039] In a third aspect, an embodiment of the present application provides a photovoltaic energy storage charging system, including: the microgrid controller described in the second aspect, a substation area transformer, multi-stage power distribution lines, and power distribution equipment;

[0040] Wherein, the substation area transformer is connected to the multi-stage power distribution lines; wherein, the multi-stage power distribution lines include: multi-stage power distribution lines connected in series, or at least one target stage power distribution line in the multi-stage power distribution lines is multiple power distribution lines connected in parallel;

[0041] Power distribution nodes and corresponding power distribution collection points are provided on each power distribution line in the multi-stage power distribution lines; the target power distribution line in the multi-stage power distribution lines is electrically connected to the power distribution equipment, and the microgrid controller is communicatively connected to the power distribution collection points corresponding to the respective power distribution nodes and the power distribution equipment to obtain their real-time powers 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 photovoltaic energy storage charging system according to any one of the first aspects described above.

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

[0044] The present application discloses a control method for a photovoltaic energy storage charging system, a microgrid controller, and a photovoltaic energy storage charging system. The photovoltaic energy storage charging system includes: a multi-stage power distribution line; wherein, a power distribution node and a corresponding power distribution acquisition point are provided on each power distribution line in the multi-stage power distribution line; the target power distribution line in the multi-stage power distribution line is electrically connected to each power distribution device; the method may include: obtaining the real-time power of at least two power distribution nodes in the photovoltaic energy storage charging system and the real-time power of the target power distribution device to provide a data basis for later control, wherein each power distribution node is located on a power distribution line where the target power distribution device is located; according to the real-time power of at least two power distribution nodes, the preset energy storage power adjustment targets corresponding to at least two power distribution nodes, and the real-time power of the target power distribution device, to realize the reasonable distribution and efficient utilization of energy, and further realize the power control of the target power distribution device, so that the photovoltaic energy storage charging system can perform precise adjustment according to the specific conditions of different power distribution devices and different power distribution nodes. Such refined control can not only meet the diverse power demands of different users, but also realize the flexible distribution of power resources, and ensure the power distribution safety of the photovoltaic energy storage charging system. Among them, by setting the preset energy storage power adjustment targets corresponding to different power distribution nodes, the control of the multi-stage power distribution line is realized, and in the case of large load fluctuations, the output power of the power distribution device is adjusted in time to avoid the power oscillation problem of the photovoltaic energy storage charging system. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the protection scope of the present application. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0046] Figure 1 Structural schematic diagram of a photovoltaic energy storage charging system provided by an embodiment of the present application Figure 1 ;

[0047] Figure 2 Structural schematic diagram of a photovoltaic energy storage charging system provided by an embodiment of the present application Figure 2 ;

[0048] Figure 3 Structural schematic diagram of a microgrid controller provided by an embodiment of the present application;

[0049] Figure 4 Flow schematic diagram of a control method for a photovoltaic energy storage charging system provided by an embodiment of the present application Figure 1 ;

[0050] Figure 5 Flow schematic diagram of a control method for a photovoltaic energy storage charging system provided by an embodiment of the present application Figure 2 ;

[0051] Figure 6 Schematic diagram of the process of a control method for a photovoltaic energy storage charging system provided by an embodiment of the present application Figure 3 ;

[0052] Figure 7 Schematic diagram of the process of a control method for a photovoltaic energy storage charging system provided by an embodiment of the present application Figure 4 ;

[0053] Figure 8 Schematic diagram of the process of a control method for a photovoltaic energy storage charging system provided by an embodiment of the present application Figure 5 ;

[0054] Figure 9 Schematic diagram of the process of a control method for a photovoltaic energy storage charging system provided by an embodiment of the present application Figure 6 ;

[0055] Figure 10 Schematic diagram of the process of a control method for a photovoltaic energy storage charging system provided by an embodiment of the present application Figure 7 ;

[0056] Figure 11 Schematic diagram of the process of a control method for a photovoltaic energy storage charging system provided by an embodiment of the present application Figure 8 ;

[0057] Figure 12 Schematic diagram of the operating power curve of each part under the multi-node target control corresponding to a photovoltaic energy storage charging system provided by an embodiment of the present application;

[0058] Figure 13 Schematic diagram of the structure of a control device for a photovoltaic energy storage charging system provided by an embodiment of the present application. Detailed implementation manners

[0059] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments.

[0060] Next, some implementation manners of the present application will be described in detail in conjunction with the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0061] Since the photovoltaic energy storage charging system may include: a microgrid controller, a distribution transformer in the substation area, multi-stage distribution lines, and power distribution equipment, and the multi-stage distribution lines may include: multi-stage distribution lines connected in series, or at least one target-stage distribution line in the multi-stage distribution lines is a plurality of distribution lines connected in parallel, then Figure 1 Schematic diagram of the structure of a photovoltaic energy storage charging system provided by an embodiment of the present application Figure 1 . Such as Figure 1As shown, Figure 1 The photovoltaic-storage-charging system 200 may include: a microgrid controller 210, a substation transformer 220, a multi-stage distribution line 100, and a power distribution device 230.

[0062] Among them, the substation transformer 220 is connected to the multi-stage distribution line 100 to provide an electrical signal to the multi-stage distribution line 100. Among them, the multi-stage distribution line 100 is a series of multi-stage distribution lines; a distribution node 110 and a corresponding distribution acquisition point 120 are provided on each distribution line in the multi-stage distribution line 100; the target distribution line in the multi-stage distribution line 100 is electrically connected to the power distribution device 230 to collect the power distribution information of the distribution acquisition point 120 corresponding to the distribution node 110. The microgrid controller 210 is communicatively connected to the distribution acquisition points 120 corresponding to the respective distribution nodes 110 and the power distribution device 230 to obtain their respective real-time powers and their respective other power distribution information (such as voltage or current, etc.), and to control the power distribution device 230. Among them, the power distribution device 230 may include: a photovoltaic device, an energy storage device, and a charging device.

[0063] Among them, the microgrid controller 210 obtains real-time power distribution and consumption information, thereby realizing a control method for the photovoltaic-storage-charging system.

[0064] It should be noted that, taking Figure 1 the series multi-stage distribution line 100 shown as an example, Figure 1 only three-stage distribution lines are schematically shown, but it should not be understood as a limitation to this application. In actual applications, the number of stages can be increased or decreased according to requirements. In addition, it should also be noted that Figure 1 on the third-stage distribution line of Figure 1 , the power distribution device 230 and the load are connected in parallel. Among them, the type of the load is not limited, and it can be a DC load or an AC load. If the load is a DC load, considering that the multi-stage distribution line 100 generally transmits alternating current, an AC-DC conversion module needs to be connected to the distribution line to which the DC load is connected. For example, on

[0065] In another possible implementation example, Figure 2 is a schematic structure of a photovoltaic-storage-charging system provided by an embodiment of this application Figure 2 . As Figure 2 shown, the multi-stage distribution line 100 is a multi-stage distribution line in which at least one target-stage distribution line is a plurality of parallel distribution lines. In Figure 2Only the secondary distribution line is schematically shown therein. Among them, the first-level distribution line and two mutually parallel second-level distribution lines are in a series connection relationship.

[0066] It should be noted that the structure of the multi-level distribution line 100 in the above-mentioned optical storage charging system 200 is not limited to the two types mentioned above. In fact, the multi-level distribution line 100 may also present other structural forms: for example, the multi-level distribution line 100 may be composed of a single parallel distribution line; it may also be composed of a single series distribution line; or it may be composed of a series-parallel hybrid distribution line. In view of the diversity of actual application scenarios, the specific structural form of the multi-level distribution line 100 is not restricted here.

[0067] The optical storage charging system provided by this application can be composed of a microgrid controller, a substation transformer, a multi-level distribution line, and distribution equipment; among them, the substation transformer is connected to the multi-level distribution line; among them, the multi-level distribution line includes: a series multi-level distribution line, or at least one target-level distribution line in the multi-level distribution line is a plurality of parallel distribution lines, to adapt to different application scenarios and power consumption requirements. For example, in areas with large space and dispersed loads, parallel distribution lines can be used for flexible layout and efficient power distribution; in scenarios with high requirements for power supply reliability and need for step-by-step transmission, series distribution lines can better meet the needs. This greatly improves the adaptability of the optical storage charging system to complex environments compared with a distribution line with a single fixed structure, and broadens the application scope of the optical storage charging system. Each distribution line in the multi-level distribution line is provided with a distribution node and a corresponding distribution acquisition point; the target distribution line in the multi-level distribution line is electrically connected to the distribution equipment, and the microgrid controller is communicatively connected to the distribution acquisition points corresponding to each distribution node and the distribution equipment to obtain their respective real-time powers. Among them, the microgrid controller is used for the control method of the optical storage charging system; to accurately master the power operation status of each distribution line and distribution equipment, timely discover problems such as abnormal power fluctuations and distribution equipment failures, ensure the stable operation of the optical storage charging system, and provide a data basis for subsequent accurate control. And control the distribution equipment, among which the distribution equipment includes: photovoltaic equipment, energy storage equipment, and charging equipment; to realize the coordinated operation of each device according to the power generation of the photovoltaic equipment, the power of the energy storage equipment, and the power consumption demand of the charging equipment. For example, when the photovoltaic equipment generates excessive power, control the energy storage equipment to charge and store the excess electric energy; when the power consumption peak occurs and the photovoltaic equipment generates insufficient power, control the energy storage equipment to discharge and cooperate with the photovoltaic equipment to supply power to the charging equipment, optimize the energy distribution, improve the energy utilization efficiency, reduce the dependence on the external power grid, and realize the intelligent and efficient operation of the optical storage charging system.

[0068] Furthermore, to clearly describe the optical storage charging system 200 provided in the above embodiment, this application also provides a schematic structural diagram of a microgrid controller 210. Figure 3This is a schematic diagram of the structure of a microgrid controller provided in an embodiment of the present 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, that is, when the microgrid controller 210 is running, the machine readable instructions are executed, and the processor 211 communicates with the memory 212 via a bus. The processor 211 can execute the machine executable instructions to implement the control method of the solar storage charging system.

[0070] The memory 212, the processor 211 and the bus components are electrically connected to each other 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 solidified in the operating system (OS) of the microgrid controller. The processor 211 is used to execute the 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] Among them, the memory 212 can be, but is not limited to, random access memory (Random Access Memory, RAM), read only memory (Read Only Memory, ROM), programmable read-only memory (Programmable Read-Only Memory, PROM), erasable programmable read-only memory (Erasable Programmable Read-Only Memory, EPROM), electrically erasable read-only memory (Electric Erasable Programmable Read-Only Memory, EEPROM), etc.

[0072] The control method of the photovoltaic storage and charging system provided in the embodiment of the present application can be executed by a processor in the microgrid controller 210 in the photovoltaic storage and charging system 200. The control method of the photovoltaic storage and charging system provided in the above embodiment of the present application is explained and illustrated in detail in combination with the accompanying drawings as follows. Figure 4 A schematic diagram of a control method for a photovoltaic storage and charging system provided in an embodiment of the present application Figure 1 .like Figure 4 As shown, applied to the above Figure 1The energy storage charging system 200, that is, the energy storage charging system 200 may include: a multi-level power distribution line 100; wherein, a power distribution node 110 and a corresponding power distribution collection point 120 are arranged on each power distribution line in the multi-level power distribution line 100; 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 energy storage charging system and the real-time power of the target power distribution device.

[0074] Wherein, each power distribution node is located on a power distribution line where the target power distribution device is located.

[0075] In a possible implementation manner, according to the microgrid controller in the energy storage charging system, obtain the real-time power P_run_pcc of the power distribution collection points corresponding to at least two power distribution nodes in the energy storage charging system, and the real-time power P_run_pcc is the real-time power of at least two power distribution nodes; at the same time, the microgrid controller also obtains the real-time power P_run of the target power distribution device to understand the power conditions of each power distribution node and the target power distribution device, and provide a data basis for later control.

[0076] S302. Perform power control on the target power distribution device according to 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.

[0077] Wherein, the preset energy storage power adjustment target corresponding to at least two power distribution nodes is preset by the energy storage charging system, and is the power adjustment target value that the target power distribution device corresponding to the power distribution nodes of each level of power distribution line should achieve under different working conditions.

[0078] In a possible implementation manner, the microgrid controller reflects the current actual power transmission situation at different nodes on the power distribution line according to the real-time power P_run_pcc of at least two power distribution nodes; the preset energy storage power adjustment target P_con_pcc corresponding to at least two power distribution nodes to clarify the power adjustment target value that the target power distribution device should achieve under different working conditions; and the real-time power P_run of the target power distribution device to clarify the power state of the target power distribution device at the current moment; and then realize power control of the target power distribution device.

[0079] The present application provides a control method for a photovoltaic-storage-charging system. The photovoltaic-storage-charging system includes: a multi-level power distribution line; 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; the target power distribution line in the multi-level power distribution line is electrically connected to each power distribution device; the method may include: obtaining 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 device to provide a data basis for later control, where each power distribution node is located on a power distribution line where the target power distribution device is located; according to the real-time power of at least two power distribution nodes, the preset energy storage power adjustment targets corresponding to at least two power distribution nodes, and the real-time power of the target power distribution device, to achieve reasonable distribution and efficient utilization of energy, and further to achieve power control over the target power distribution device, so that the photovoltaic-storage-charging system can perform precise adjustment according to the specific conditions of different power distribution devices and different power distribution nodes. Such refined control can not only meet the diverse power demands of different users, but also achieve flexible distribution of power resources and ensure the power distribution safety of the photovoltaic-storage-charging system. Among them, by setting the preset energy storage power adjustment targets corresponding to different power distribution nodes, the control of the multi-level power distribution line is realized, and in the case of large load fluctuations, the output power of the power distribution device is adjusted in time to avoid the power oscillation problem of the photovoltaic-storage-charging system.

[0080] Optionally, the above target power distribution device may include: an energy storage device and / or a charging device.

[0081] In a possible implementation example, Figure 5 is a schematic flow chart of a control method for a photovoltaic-storage-charging system provided by an embodiment of the present application Figure 2 . As Figure 5 shown, in the above method, according to the real-time power of at least two power distribution nodes, the preset energy storage power adjustment targets corresponding to at least two power distribution nodes, and the real-time power of the target power distribution device, performing power control on the target power distribution device may include:

[0082] S401. Determine the target power adjustment value of the target power distribution device in the next time period according to 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.

[0083] In a possible implementation manner, the microgrid controller adjusts the power regulation target P_con_pcc of the preset target power distribution equipment corresponding to at least two power distribution nodes according to the real-time power P_run_pcc of at least two power distribution nodes, and the real-time power P_run of the target power distribution equipment, so as to avoid problems such as overloading and underloading of the power distribution line caused by power imbalance. Furthermore, based on these three types of data, the target power regulation value P_set_fin of the target power distribution equipment in the next time period is determined, which helps to achieve reasonable distribution and efficient utilization of energy, meet the power demands in different scenarios, and improve the adaptability and flexibility of the photovoltaic energy storage charging system.

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

[0085] In a possible implementation manner, power control is performed on the target power distribution equipment according to the target power regulation value P_set_fin. Among them, for different types of target power distribution equipment, the power control methods are different. Taking the target power distribution equipment as an energy storage device as an example, if the target power regulation value P_set_fin requires an increase in the charging power, the energy storage device will adjust the parameters of its internal power electronic converter, such as changing the conduction time and frequency of the switching device, so as to increase the rate of absorbing electric energy from the power grid or photovoltaic equipment and achieve an increase in the charging power; if an increase in the discharge power is required, the converter will be adjusted to store more electric energy and output it to the power distribution line at a higher power. If the target power distribution equipment is a charging device and the target power regulation value P_set_fin requires a reduction in the charging power, the charging device may reduce the charging power by reducing the output voltage or current.

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

[0087] Optionally, the above multi-level power distribution line may include: a series multi-level power distribution line; reference may be made to the above Figure 1 In a possible implementation embodiment, the target power distribution equipment may include: an energy storage device.

[0088] Figure 6 This is a schematic flow chart of a control method for a photovoltaic energy storage charging system provided by an embodiment of this application Figure 3 As Figure 6As shown, in the above method, determining the target power adjustment value of the target power distribution device in the next time period according to the real-time power of at least two power distribution nodes, the power adjustment target of the preset target power distribution device corresponding to at least two power distribution nodes, and the real-time power of the target power distribution device may include:

[0089] S501. Respectively determine the energy storage power adjustment values corresponding to at least two power distribution nodes according to 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.

[0090] In a possible implementation manner, taking Figure 1 as an example, obtain 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, and obtain the power adjustment target P_con_pcc1_des of the preset energy storage device corresponding to the primary power distribution node, the power adjustment target P_con_pcc2_des of the preset energy storage device corresponding to the secondary power distribution node, and the power adjustment target P_con_pcc3_des of the preset energy storage device corresponding to the tertiary power distribution node. At the same time, obtain the real-time power P_run_des of the energy storage device, and then calculate the energy storage power adjustment value P_set_des_pcc corresponding to the power adjustment target of each power distribution node 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] Among them, P_con_pcc1_des is the power adjustment target of the preset energy storage device for the total power distribution acquisition point ( Figure 1 in 120-1) of the primary power distribution line; P_set_des_pcc1 is the energy storage power adjustment value for the total power distribution acquisition point ( Figure 1 in 120-1), and this energy storage power adjustment value is the energy storage power adjustment target value for the total power distribution acquisition point, that is, the setting value at which the energy storage device should operate in the next stage. P_con_pcc2_des is the power adjustment target of the preset energy storage device for the power distribution acquisition point ( Figure 1the power regulation target of the preset energy storage device in (120-2); P_set_des_pcc2 is the energy storage power regulation value for the power distribution collection point of the secondary distribution line ( Figure 1 the energy storage power regulation value in (120-2). Furthermore, the power regulation target P_con_pccn_des of the preset energy storage device for a multi-level distribution line and the energy storage power regulation value P_set_des_pccn can be obtained by similar expansion.

[0095] S502. If the control strategy of the energy storage device in the next time period is the charge-discharge dynamic capacity increase strategy, determine the minimum power regulation value as the first target power regulation value of the energy storage device in the next time period according to the energy storage power regulation values corresponding to at least two distribution nodes.

[0096] In a possible implementation manner, if the control strategy of the energy storage device in the next time period is the charge-discharge dynamic capacity increase strategy, according to the energy storage power regulation values P_set_des_pcc corresponding to at least two distribution nodes, determine the minimum power regulation value as the first target power regulation value P1_set_des_fin of the energy storage device in the next time period according to the following formula (2).

[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 regulation value P1_set_des_fin of the energy storage device in the next time period obtained by the above formula (2), the relevant factors of peak-valley periods are not considered for distribution.

[0100] S503. If the control strategy of the energy storage device in the next time period is the only discharge dynamic capacity increase strategy, determine the minimum power regulation value as the first target power regulation value of the energy storage device in the next time period according to the energy storage power regulation values corresponding to at least two distribution nodes and the preset minimum power value.

[0101] Among them, the preset minimum power value can be selected according to the actual operation situation of the energy storage device. For example, the preset minimum power value can be 0KW.

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

[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 calculating the first target power adjustment value P1_set_des_fin of the energy storage device in the next time period obtained by the above formula (3), relevant factors in the peak-valley period are taken into consideration for distribution, and during this period, it is necessary to prevent the energy storage device from charging during distribution capacity increase.

[0106] Exemplarily, continuing to refer to Figure 1 , in the actual application process, the dynamic capacity increase of the energy storage device generally needs to be combined with the peak-valley period for operation. The timing charge and discharge function of the energy storage device can be realized according to the division of the peak-valley period, and the energy storage device also needs to have relevant functions such as anti-counterflow, maximum demand control, and dynamic capacity increase.

[0107] In a possible implementation example, for the charging and dynamic capacity increase strategy of the energy storage device in the valley period, the first target power adjustment value P1_set_des_fin of the energy storage device in the next time period can be determined by the following formula (4).

[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 example, for the strategy of dynamic capacity increase but no charging of the energy storage device in the normal period, the first target power adjustment value P1_set_des_fin of the energy storage device in the next time period can be determined by the following formula (5).

[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 example, since the charging and dynamic capacity increase strategies of the energy storage device during normal periods are the same as those of the energy storage device during valley periods. Then the determined first target power adjustment value P1_set_des_fin of the energy storage device in the next time period is also the same. This will not be elaborated here.

[0114] In another possible implementation example, for the normal discharge strategy of the energy storage device during peak periods, the following formula (6) can be used to determine the first target power adjustment value P1_set_des_fin of the energy storage device in the next time 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 preventing reverse current in the photovoltaic energy storage charging system, generally set to 0 KW. Because during peak periods, the photovoltaic energy storage charging system only considers the function of preventing reverse current. Therefore, the total power distribution collection point (such as Figure 1 120 - 1 in) is used as the reverse current prevention control point.

[0117] It should be noted that the above are several implementation examples for determining the first target power adjustment value P1_set_des_fin of the energy storage device in the next time period, and it should not be understood as a limitation to this application.

[0118] For the control method of the optical 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 device is an energy storage device; then, according to the real-time power of at least two power distribution nodes, the power regulation targets of the preset energy storage devices corresponding to at least two power distribution nodes, and the real-time power of the energy storage device, the energy storage power regulation values corresponding to at least two power distribution nodes can be determined respectively, which can more accurately understand the power conditions at different positions of the power distribution line, and then make the energy storage device operate more efficiently and reasonably in the entire series power distribution line. If the control strategy of the energy storage device in the next time period is the charge-discharge dynamic capacity increase strategy, then according to the energy storage power regulation values corresponding to at least two power distribution nodes, determine the minimum power regulation value as the first target power regulation value of the energy storage device in the next time period, which can ensure that the energy storage device charges and discharges in the most conservative and safe power regulation manner in the complex and changeable series power distribution line environment. Avoid power imbalance at a certain power distribution node or damage to the performance of the energy storage device itself due to excessive power regulation, and maintain the stability of the optical storage charging system. If the control strategy of the energy storage device in the next time period is the only discharge dynamic capacity increase strategy, then according to the energy storage power regulation values corresponding to at least two power distribution nodes and the preset minimum power value, determine the minimum power regulation value as the first target power regulation value of the energy storage device in the next time period, which is a special requirement in the scenario where only the discharge of the energy storage device is considered. Ensure that the energy storage device always maintains within a safe power range that meets the requirements of the optical storage charging system during the discharge process. For example, during peak electricity consumption and when the photovoltaic device generates insufficient power, the energy storage device discharges with an appropriate minimum power regulation value, which can not only supplement power for the optical storage charging system but also not affect its service life and performance due to excessive discharge, while ensuring the power stability of the series power distribution line.

[0119] Optionally, at least one target-level power distribution line in the above multi-level power distribution line is a plurality of parallel power distribution lines; reference can be made to the above Figure 2 . In a possible implementation embodiment, the target power distribution device may include: an energy storage device.

[0120] Figure 7 The flow diagram of a control method for an optical storage charging system provided by an embodiment of this application Figure 4 . As Figure 7 shown, in the above method, according to the real-time power of at least two power distribution nodes, the power regulation targets of the preset target power distribution devices corresponding to at least two power distribution nodes, and the real-time power of the target power distribution device, determining the target power regulation value of the target power distribution device in the next time period may include:

[0121] S601. According to the real-time power of at least two power distribution nodes, the power regulation targets of the preset energy storage devices corresponding to at least two power distribution nodes, and the real-time power of the energy storage device, respectively determine the energy storage power regulation values corresponding to at least two power distribution nodes.

[0122] In a possible implementation, taking Figure 2 as an example, obtain the real-time power P_run_pcc0 of the primary distribution node and the real-time powers P_run_pcc1 and P_run_pcc2 of two secondary distribution nodes, and obtain the power regulation target P_con_pcc0_des of the preset energy storage device corresponding to the primary distribution node and the power regulation targets P_con_pcc1_des and P_con_pcc2_des of the preset energy storage devices corresponding to the secondary distribution nodes; at the same time, obtain the real-time power P_run_des of the energy storage device; considering the power distribution capacity increase of the energy storage device, calculate the energy storage power regulation value P_set_des_n corresponding to the power control target of each distribution node through 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] where P_set_des_n represents the power regulation target within the power distribution acquisition point of the nth power distribution line, and is the power value that the energy storage device should run in the next stage calculated at the preset initial moment. Among them, P_con_pcc_n represents the power regulation target of the distribution node corresponding to the energy storage device within the power distribution acquisition point on the nth power distribution line; P_run_pcc_n represents the real-time operating power value of the distribution node corresponding to the energy storage device within the power distribution acquisition point on the nth power distribution line; the preset initial moment can be selected according to the actual situation. For example, the preset initial moment can be selected as the T0 moment.

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

[0127] In a possible implementation, first calculate the sum P_run_des_total of the real-time operating powers of all energy storage devices in the photovoltaic energy storage charging system through the following formula (8) according to the real-time power P_run_des of the energy storage power corresponding to at least two distribution nodes.

[0128]

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

[0130] where P_run_des_n represents the real-time operating power value of the energy storage device within the power distribution acquisition point on the nth power distribution line.

[0131] Based on the sum of the real-time operating powers of the energy storage devices P_run_des_total obtained from the above formula (8), and the real-time power P_run_pcc0 and the power regulation target P_con_pcc0 of the primary distribution node corresponding to the energy storage device (such as Figure 2 110-1 in [the reference]), the primary energy storage power regulation value P_set_des_total corresponding to the primary distribution node is determined through the following formula (9).

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

[0133] Among them, P_set_des_total represents the power regulation target for the main distribution node (such as Figure 2 110-1 in [the reference]), and is the operating power value of all energy storage devices in the next-stage photovoltaic-storage-charging system; among them, P_con_pcc0 represents the power regulation target of the main distribution node of the photovoltaic-storage-charging system; P_run_pcc0 represents the real-time operating power value of the main distribution node of the photovoltaic-storage-charging system.

[0134] S603. Calculate the total energy storage power regulation value according to the energy storage power regulation values of at least two distribution nodes.

[0135] In a possible implementation manner, according to the energy storage power regulation values P_set_des of at least two distribution nodes, referring to the above formula (7), the total energy storage power regulation value P_set_des_n_total is calculated through the following formula (10).

[0136]

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

[0138] S604. Determine whether the energy storage power regulation values corresponding to at least two distribution nodes meet the preset distribution requirements according to the total energy storage power regulation value and the primary energy storage power regulation value.

[0139] Among them, the preset distribution requirements can be selected according to the actual situation.

[0140] In a possible implementation manner, according to 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 values P_set_des corresponding to at least two distribution nodes meet the preset distribution requirements. If the preset distribution requirements are met, step S605 can be executed; if the preset 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 a possible implementation manner, if the preset power distribution requirements are met, that is, the total energy storage power adjustment value P_set_des_n_total is greater than or equal to the primary energy storage power adjustment value P_set_des_total, that is, the total power distribution node (such as Figure 2 110-1 in) meets the preset power distribution requirements, and each branch power distribution node except the total power distribution node also meets the preset power distribution requirements, then directly compare the corresponding energy storage power adjustment values of each power distribution node (such as P_set_des_1, P_set_des_2,..., P_set_des_n) with the preset maximum output power value P_max_des_n of the energy storage device respectively, obtain the maximum value corresponding to each power distribution node for distribution, and 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 energy storage power adjustment values of at least two power distribution nodes.

[0144] In a possible implementation manner, if the preset power distribution requirements are not met, that is, the total energy storage power adjustment value P_set_des_n_total is less than the primary energy storage power adjustment value P_set_des_total. At this time, the total power distribution node (such as Figure 2 110-1 in) does not meet the preset power distribution requirements, but each branch power distribution node except the total power distribution node meets the preset power distribution requirements. Then, it is necessary to continue to adjust the power of the corresponding energy storage power adjustment values of each power distribution node (such as P_set_des_1, P_set_des_2,..., P_set_des_n) before distribution, that is, obtain the secondary energy storage power adjustment values P_send_des_n of at least two power distribution nodes.

[0145] S607. Determine the secondary 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.

[0146] In a possible implementation manner, according to the secondary energy storage power adjustment values P_send_des_n of at least two power distribution nodes, calculate the total secondary energy storage power adjustment value P_send_des_n_total through the following formula (11).

[0147]

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

[0149] Based on the total secondary regulation value of the energy storage power P_send_des_n_total obtained from the above formula (11), judge the magnitude 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, determine that the secondary regulation values of the energy storage power P_send_des_n of at least two distribution nodes are the first target power regulation values of the energy storage device in the next time period, and issue them.

[0150] If P_send_des_n_total > P_set_des_total, it means that the energy storage devices in the distribution acquisition points on some distribution lines have reached their maximum output capabilities. At this time, if the secondary regulation values of the energy storage power P_send_des_n of at least two distribution nodes are directly issued, there will be a situation where the real-time operating power of some distribution nodes does not meet the power regulation targets of each distribution node. Therefore, it is necessary to optimize the secondary regulation values of the energy storage power P_send_des_n of at least two distribution nodes before issuing. Among them, the optimized secondary regulation values of the energy storage power P_send_des_n of at least two distribution nodes are the first target power regulation values of the energy storage device in the next time period.

[0151] Among them, the optimization method of the secondary regulation values of the energy storage power P_send_des_n of at least two distribution nodes is as follows:

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

[0153]

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

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

[0156]

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

[0158] If the total secondary regulation value of the first optimized energy storage power P_send_des_n_T1_total is less than or equal to the primary energy storage power regulation value P_set_des_total corresponding to the primary distribution node (i.e., P_send_des_n_T1_total << P_set_des_total), then determine the secondary regulation value of the first optimized energy storage power P_send_des_n_T1 of each distribution node as the first target power regulation value of the energy storage device in the next time period and send it down.

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

[0160]

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

[0162] Among them, according to the second optimized energy storage power secondary regulation value P_send_des_n_T2, calculate the total second optimized energy storage power secondary regulation value P_send_des_n_T2_total corresponding to the secondary regulation values of the energy storage power P_send_des_n of at least two distribution nodes 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 regulation value P_send_des_n_T2_total is less than or equal to the primary energy storage power regulation value P_set_des_total corresponding to the primary distribution node (i.e., P_send_des_n_T2_total ≤ P_set_des_total), then determine the second optimized energy storage power secondary regulation value P_send_des_n_T2 of each distribution node as the first target power regulation value of the energy storage device in the next time period and send it down.

[0166] If the total secondary regulation value of the second optimized energy storage power P_send_des_n_T2_total is greater than the primary energy storage power regulation value P_set_des_total corresponding to the primary distribution node (i.e., P_send_des_n_T2_total > P_set_des_total), then it is necessary to optimize the secondary regulation value of the energy storage power P_send_des_n of the nth distribution node for the third time to obtain the third optimized secondary regulation value of the energy storage power P_send_des_n_T3. And so on, until the total secondary regulation value of the second optimized energy storage power P_send_des_n_Tn_total ≤ the primary energy storage power regulation value P_set_des_total corresponding to the primary distribution node, the optimization process ends. At this time, the nth optimized secondary regulation value of the energy storage power P_send_des_n_Tn of each distribution node is determined as the first target power regulation value of the energy storage device in the next time period and is sent down.

[0167] It should be noted that the total number of optimizations of the secondary regulation values P_send_des_n of the energy storage powers of at least two distribution nodes in the photovoltaic-storage-charging system does not exceed n - 1 times. Finally, the first target power regulation values of the energy storage devices corresponding to each distribution node can be obtained and sent down.

[0168] The control method of the photovoltaic energy storage charging system provided by this application. If at least one target-level distribution line in the multi-level distribution line is multiple parallel distribution lines; and the target distribution device is an energy storage device; then, according to the real-time power of at least two distribution nodes, the power adjustment targets of the preset energy storage devices corresponding to at least two distribution nodes, and the real-time power of the energy storage device, respectively determine the energy storage power adjustment values corresponding to at least two distribution nodes, so as to accurately capture the unique power conditions of different parallel distribution line nodes, make the power adjustment of the energy storage device more in line with the actual needs of each distribution node, and optimize the energy storage utilization efficiency of the entire parallel distribution line area. According to the energy storage power adjustment values corresponding to at least two distribution nodes, as well as the real-time power and power adjustment target of the primary distribution node corresponding to the energy storage device, determine the primary energy storage power adjustment value corresponding to the primary distribution node; calculate the total energy storage power adjustment value according to the energy storage power adjustment values of at least two distribution nodes; according to the total energy storage power adjustment value and the primary energy storage power adjustment value, determine whether the energy storage power adjustment values corresponding to at least two distribution nodes meet the preset distribution requirements, so as to establish a coordinated control mechanism from local nodes to the overall photovoltaic energy storage charging system. Among them, taking the primary distribution node as the key hub, comprehensively consider the power adjustment conditions of each parallel line node to ensure the balance and stability of power distribution in the entire photovoltaic energy storage charging system, and ensure the stable operation of each distribution line and the entire photovoltaic energy storage charging system. If the preset distribution requirements are met, determine the maximum value among the energy storage power adjustment values of at least two distribution nodes as the first target power adjustment value of the energy storage device in the next time period, ensuring that the energy storage device operates in a relatively efficient and non-overloaded state on the premise of meeting the overall needs of the photovoltaic energy storage charging system; if the preset distribution requirements are not met, obtain the secondary energy storage power adjustment values of at least two distribution nodes, providing a flexible adjustment mechanism for the energy storage device in the complex and changeable parallel distribution line environment. For example, in the event of sudden power fluctuations or abnormal working conditions, the secondary energy storage power adjustment value can enable the energy storage device to quickly adjust its power, maintain its own safe and stable operation while continuously providing reliable power support for the photovoltaic energy storage charging system, extend the service life of the energy storage device, and reduce the failure risk of the energy storage device. Determine the secondary energy storage power adjustment values of at least two distribution nodes as the first target power adjustment value of the energy storage device in the next time period. Thus, the photovoltaic energy storage charging system of this application has stronger reliability and adaptability when facing complex parallel distribution line conditions, not only ensuring the continuity and stability of power supply, but also improving the adaptability of the photovoltaic energy storage charging system to different application scenarios and broadening the application scope of the photovoltaic energy storage charging system.

[0169] Figure 8 Schematic flow of a control method for a photovoltaic energy storage charging system provided by an embodiment of this application Figure 5 . Such as Figure 8 shown, in the above method, for obtaining the secondary energy storage power adjustment values of at least two distribution nodes, it may include:

[0170] S701. Obtain 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 the preset number of distribution nodes.

[0171] Among them, the preset number of distribution nodes n can be determined according to the specific number of poles of the multi-level distribution line, which is not limited here.

[0172] In a possible implementation manner, based on the energy storage power adjustment values P_set_des_n corresponding to at least two distribution nodes, the primary energy storage power adjustment value P_set_des_total corresponding to the primary distribution node, and the preset number of distribution nodes n obtained according to the above formula (7), calculate the adjustment range △P_set_des of each distribution node according to the following formula (16).

[0173]

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

[0175] S702. Determine the secondary energy storage power adjustment values of at least two distribution nodes according to 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.

[0176] In a possible implementation manner, based on the adjustment range △P_set_des of each distribution node, the energy storage power adjustment values 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, calculate and determine the secondary energy storage power adjustment values P_send_des_n of at least two distribution nodes according to the following formula (17).

[0177]

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

[0179] The control method of the photovoltaic energy storage charging system provided by this application obtains the adjustment amplitude of each distribution node according to 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; according to the adjustment amplitude 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, determine the secondary energy storage power adjustment values of at least two distribution nodes, which helps to achieve the optimal energy distribution of the photovoltaic energy storage charging system. Under different time periods and working conditions, the photovoltaic energy storage charging system can dynamically adjust the energy storage power according to the actual power demands of each distribution node and the available capacity of the energy storage device, thereby improving the energy utilization efficiency of the entire photovoltaic energy storage charging system and reducing the dependence on the external power grid. Among them, during the power adjustment process, the physical performance and safe operation limit of the energy storage device are fully considered through the preset maximum output power value of the energy storage device.

[0180] Optionally, the above target distribution equipment may include: charging equipment. In a possible implementation example, Figure 9 is a schematic flow chart of a control method for a photovoltaic energy storage charging system provided by an embodiment of this application Figure 6 . As Figure 9 shown, in the above method, determining the target power adjustment value of the target distribution equipment in the next time period according to 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 may include:

[0181] S801. Determine whether the preset maximum output power value of the energy storage device meets the preset distribution capacity increase requirement when the preset maximum output power value of the energy storage device is output according to the real-time power of at least two distribution nodes, the power adjustment target of the preset charging equipment 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.

[0182] In a possible implementation manner, taking Figure 1For example, obtain the real-time power P_run_pcc1 of the primary distribution node, the real-time power P_run_pcc2 of the secondary distribution node, and the real-time power P_run_pcc3 of the tertiary distribution node, and obtain the power regulation target P_con_pcc1_cha of the preset energy storage device corresponding to the primary distribution node, the power regulation target P_con_pcc2_cha of the preset energy storage device corresponding to the secondary distribution node, and the power regulation target P_con_pcc3_cha of the preset energy storage device corresponding to the tertiary distribution node. At the same time, obtain 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, and determine whether the preset maximum output power value of the energy storage device meets the preset power distribution capacity increase requirement when output. If the preset power distribution capacity increase requirement is met, there is no need to limit the power of the charging device. If the preset power distribution capacity increase requirement is not met, step S802 is executed.

[0183] S802. If the preset power distribution capacity increase requirement is not met, then according to the real-time power of the charging device, the real-time powers of at least two distribution nodes, the preset charging power regulation 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, determine the second target power regulation value of the charging device in the next time period.

[0184] In a possible implementation manner, if the preset power distribution capacity increase requirement is not met, it means that when the preset maximum output power value of the energy storage device is output, the preset power distribution capacity increase requirement is not met. Then, according to the real-time power P_run_cha of the charging device, the real-time powers P_run_pcc of at least two distribution nodes, the preset charging power regulation targets P_con_pcc_des corresponding to at least two 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, first limit the power of the charging device, and calculate the power distribution value P_set_cha of the charging device 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 transmission 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 time period.

[0189] It should be noted that regardless of the above Figure 1 still Figure 2 As shown in the structural diagram of the optical storage and charging system, when the target distribution equipment is the charging equipment, the method for determining the second target power adjustment value of the charging equipment in the next time period is consistent, that is, the power limitation of the charging equipment is considered after the energy storage equipment is adjusted to reach the preset maximum output power value P_max_des_n, and the target power control within the distribution node is given priority, and then the target power control value of the total distribution node is considered.

[0190] In addition, it should be noted that the preset maximum output power value P_max_des_n of the energy storage device is a positive value, which is the absolute value of the maximum dischargeable power of the energy storage device. If the energy storage device cannot be discharged, the preset maximum output power value P_max_des_n of the energy storage device is 0.

[0191] The control method of the photovoltaic storage and charging system provided in the present application, the target distribution equipment is the charging equipment; according to the real-time power of at least two distribution nodes, the power regulation target of the preset charging equipment corresponding to the at least two distribution nodes, the real-time power of the energy storage equipment and the preset maximum output power value of the energy storage equipment, it is determined whether the preset maximum output power value of the energy storage equipment meets the preset distribution capacity expansion demand when output, so as to ensure that in the photovoltaic storage and charging system, when facing the increase in electricity demand, the photovoltaic storage and charging system is capable of evaluating whether the existing power resources can meet the capacity expansion requirements, thereby ensuring the stability of the photovoltaic storage and charging system in capacity expansion scenarios such as peak power consumption. If the preset power distribution capacity expansion demand is not met, the second target power adjustment value of the charging device in the next time period is determined according to the real-time power of the charging device, 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. This is to accurately adjust the power of the charging device according to the actual power status of the photovoltaic storage and charging system to avoid the collapse of the photovoltaic storage and charging system due to overcharging, while ensuring that the charging equipment operates at appropriate power to meet some charging needs and improve the reliability and stability of the overall operation of the photovoltaic storage and charging system.

[0192] Figure 10 A schematic diagram of a control method for a photovoltaic storage and charging system provided in an embodiment of the present application Figure 7 .like Figure 10As shown, in the above method, according to the real-time power of at least two distribution nodes, the preset charging power adjustment targets corresponding to the 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, determining whether the preset maximum output power value of the energy storage device meets the preset distribution capacity increase requirement when outputting may include:

[0193] S901. According to the real-time power of at least two distribution nodes, the preset charging power adjustment targets corresponding to the 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, respectively determine the charging power adjustment values corresponding to the at least two distribution nodes.

[0194] In a possible implementation manner, according to the real-time power P_run_pcc of at least two distribution nodes, the preset charging power adjustment target P_con_pccn_cha corresponding to the at least two 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 values P_set_cha_pccn corresponding to the at least two distribution nodes are respectively 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] Where P_con_pccn_cha is the power adjustment target value of the charging device for the total power distribution collection point of the n-level power distribution line; P_con_pccn_cha is the power adjustment target value of the charging device for the power distribution 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 the at least two distribution nodes is greater than or equal to the preset minimum power value.

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

[0200] In a possible implementation manner, determine whether the maximum power adjustment value MAX among the charging power adjustment values corresponding to the at least two distribution nodes is greater than or equal to the preset minimum power value (such as 0KW) according to the following formula (20).

[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 increase requirement is not met.

[0204] In a possible implementation, if the maximum power adjustment value MAX is greater than or equal to the preset minimum power value (such as 0 KW), it is determined that the preset power distribution capacity increase requirement is not met, which means that when the preset maximum output power value of the energy storage device is output, the preset power distribution capacity increase requirement is not met, and the charging device needs to be power-limited.

[0205] S904. If the maximum power adjustment value is less than the preset minimum power value, it is determined that the preset power distribution capacity increase requirement is met.

[0206] In a possible implementation, if the maximum power adjustment value MAX is less than the preset minimum power value (such as 0 KW), it is determined that the preset power distribution capacity increase requirement is met, which means that there is no need to power-limit the charging device.

[0207] The present application provides a control method for a photovoltaic energy storage charging system. According to 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 charging power adjustment values corresponding to at least two distribution nodes are determined respectively, providing a comprehensive data basis for accurately evaluating the distribution capacity increase demand. Different distribution nodes are affected by factors such as the distribution of electricity consumption loads and the access of photovoltaic power, and their power conditions are diverse. Through such meticulous calculations, the photovoltaic energy storage charging system can accurately grasp the power change trends of each distribution node, thereby accurately determining whether the power resources of the current photovoltaic energy storage charging system can meet the preset distribution capacity increase demand, providing a reliable basis for subsequent decision-making. Determine 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 distribution capacity increase demand is not met; if the maximum power adjustment value is less than the preset minimum power value, it is determined that the preset distribution capacity increase demand is met. Thus, the photovoltaic energy storage charging system of the present application can timely discover 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 distribution capacity increase demand is not met, and the photovoltaic energy storage charging system can take measures in advance, such as adjusting the power of the charging device, optimizing the charge and discharge strategy of the energy storage device, etc., to avoid the collapse of the photovoltaic energy storage charging system due to power overload, ensure the stable operation of the photovoltaic energy storage charging system under various working conditions, reduce the occurrence probability of power outages, and improve the reliability of power supply.

[0208] Optionally, in the above method, when determining whether the preset maximum output power value of the energy storage device meets the preset distribution capacity increase demand when outputting according to 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, it may further include:

[0209] If the preset distribution capacity increase demand is met, then according to the charging demand power of the device to be charged connected to the charging device, determine the second target power adjustment value of the charging device in the next time period.

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

[0211] The present application provides a control method for a photovoltaic energy storage charging system. If the preset power distribution capacity increase requirement is met, the second target power adjustment value of the charging device for the next time period is determined according to the charging demand power of the device to be charged connected to the charging device. Thus, the present application can determine the second target power adjustment value based on the charging demand power 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, improving the charging efficiency, and avoiding the risks of too long charging time or device damage caused by power mismatch.

[0212] For the convenience of understanding the above control method of the photovoltaic energy storage charging system, taking Figure 1 as an example, the embodiment of the present application also provides an example of the flow of the control method of the photovoltaic energy storage charging system, which will be further described below in conjunction with the accompanying drawings. Figure 11 It is a schematic diagram of the flow of the control method of the photovoltaic energy storage charging system provided by the embodiment of the present application. Figure 8 . As Figure 11 shown, the schematic diagram provided by the embodiment of the present application Figure 8 may include:

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

[0214] Specifically, according to the microgrid controller, the real-time power P_run_pcc of at least two power distribution nodes and the power adjustment target P_con_pcc of the preset target power distribution devices corresponding to at least two power distribution nodes are used to simultaneously obtain the real-time power P_run_des of the energy storage device and the real-time power P_run_cha of the charging device, so as to understand the power conditions of each power distribution node, energy storage device, and charging device, and provide a data basis for subsequent control.

[0215] S1002. Determine the energy storage power adjustment values corresponding to at least two power distribution nodes respectively according to the real-time power of at least two power distribution nodes in the photovoltaic energy storage charging system, the preset energy storage power adjustment target, and the real-time power of the energy storage device.

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

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

[0218] Specifically, if the relevant factors of peak, valley, and flat periods are not considered, the minimum power regulation value in the energy storage power regulation values P_set_des_pcc corresponding to at least two distribution nodes is determined according to the above formula (2) as 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, valley, and flat periods are considered, the minimum power regulation value in the energy storage power regulation values P_set_des_pcc corresponding to at least two distribution nodes is determined according to the above formula (3) as 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 distribution capacity increase requirement when output, and calculate the first target power regulation value of the charging device in the next period.

[0221] Specifically, according to the real-time power P_run_pcc of at least two distribution nodes in the photovoltaic-storage-charging system, the preset energy storage power regulation target P_con_pcc, and the real-time power P_run_cha of the charging device, determine whether the preset maximum output power value P_max_des_n of the energy storage device meets the preset distribution capacity increase requirement according to the above formula (20).

[0222] If the maximum power regulation value MAX is greater than or equal to the preset minimum power value (such as 0 KW), it is determined that the preset distribution capacity increase requirement is not met, which means that when the preset maximum output power value of the energy storage device is output, the preset distribution capacity increase requirement is not met, and the charging device needs to be power-limited according to the above formula (18).

[0223] If the maximum power regulation value MAX is less than the preset minimum power value (such as 0 KW), it is determined that the preset distribution capacity increase requirement is met, which means that there is no need to power-limit the charging device. Then, the second target power regulation value P2_set_des_fin of the charging device in the next period can be determined according to the charging demand power P_run_need of the device to be charged connected to the charging device, that is, P2_set_des_fin = P_run_need.

[0224] Exemplarily, Figure 12 is a schematic diagram of the operating power curve of each part under the multi-node target control corresponding to a photovoltaic-storage-charging system provided in an embodiment of the present application. The Figure 12 is based on Figure 1 as an example, and the power curve diagrams of each distribution node, the energy storage device, and the charging device operating in the valley period are obtained. As Figure 12 shown, at time T1, the load of the primary distribution line suddenly increases, and the total distribution acquisition point (such as Figure 1110-1) in which the real-time power P_run_pcc1 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 optical storage and charging system provided in this application, and dynamically adjusts to reduce the charging power of the energy storage device so that it can meet the target control power of each distribution node. At 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 optical storage and charging system, and dynamically adjusts to increase the charging power of the energy storage device so that it can meet the target control power of each distribution node; the other moments T3, T4, T5, and T6 are when the load of the secondary distribution line suddenly increases and recovers, respectively, and the energy storage device is dynamically adjusted according to the control method of the optical storage and charging system; at T7, the loads of the primary, secondary, and tertiary distribution lines all increase suddenly at the same time, 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 optical storage and charging system Responsive adjustment is carried out to dynamically adjust the operating power of the energy storage equipment so that it can meet the target control power of each distribution node; at time T8, since the load on the primary distribution line has increased and has exceeded the preset maximum output power value P_max_des_n that the energy storage equipment can adjust, the charging equipment also starts to start power-limited operation; at time T9, since the load on the primary distribution line has decreased, the real-time power of each distribution node is less than its corresponding power adjustment target P_con_pcc, the charging equipment releases the power-limited state, and the energy storage device also adjusts the operating power value at the same time to ensure the operation of the charging equipment while meeting the target control power of each distribution node.

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

[0226] The present application provides a control method for a photovoltaic-storage-charging system, which obtains the real-time power of at least two distribution nodes in the photovoltaic-storage-charging system, a preset energy storage power regulation target, the real-time power of an energy storage device, and the real-time power of a charging device. According to the real-time power of at least two distribution nodes in the photovoltaic-storage-charging system, the preset energy storage power regulation target, and the real-time power of the energy storage device, the energy storage power regulation values corresponding to at least two distribution nodes are respectively determined, and the first target power regulation value of the energy storage device in the next time period is calculated; it is determined whether the preset maximum output power value of the energy storage device meets the preset distribution capacity increase requirement when output, and the first target power regulation value of the charging device in the next time period is calculated. Thus, by setting the target power regulation values of different energy storage devices and charging devices, the present application realizes the hierarchical control response of multiple devices, and preferentially adjusts the output power of the energy storage device in the case of large load fluctuations. If it exceeds the preset maximum output power value of the energy storage device, the power of the charging device is limited, avoiding the power oscillation problem during the regulation of the photovoltaic-storage-charging system. In addition, the present application can also calculate the power regulation values of the energy storage device and the charging device corresponding to meeting the power regulation target of each distribution node by comparing and analyzing the power control target and the actual power value of each distribution node, and then calculate and analyze the power regulation values of multiple energy storage devices and charging devices, and select the target power regulation value that can meet the power regulation target of all distribution nodes for distribution, ensuring the distribution safety of each part of the photovoltaic-storage-charging system.

[0227] Based on the same inventive concept, an embodiment of the present application also provides a control device for a photovoltaic-storage-charging system. Since the principle of the device in the embodiment of the present application for solving problems is similar to the above control method of the photovoltaic-storage-charging system in the embodiment of the present 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 It is a schematic structural diagram of a control device for a photovoltaic-storage-charging system provided by an embodiment of the present application. As Figure 13 shown, the photovoltaic-storage-charging system includes: a multi-stage distribution line; wherein, a distribution node and a corresponding distribution acquisition point are arranged on each distribution line in the multi-stage distribution line; the target distribution line in the multi-stage distribution line is electrically connected to each distribution device; the control device 1100 of the photovoltaic-storage-charging system may include: an acquisition module 1110, a control module 1120.

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

[0230] A control module 1120 is configured to perform power control on a target power distribution device according to the real-time power of at least two power distribution nodes, the preset energy storage power regulation targets corresponding to the at least two power distribution nodes, and the real-time power of the target power distribution device.

[0231] In an alternative embodiment, the target power distribution device includes: an energy storage device and / or a charging device; the control module 1120 is specifically configured to: determine a target power regulation value of the target power distribution device in the next time period according to the real-time power of at least two power distribution nodes, the power regulation targets of the preset target power distribution devices corresponding to the at least two power distribution nodes, and the real-time power of the target power distribution device; perform power control on the target power distribution device according to the target power regulation value.

[0232] In an alternative embodiment, the multi-stage power distribution line includes: a multi-stage power distribution line connected in series; the target power distribution device includes: an energy storage device; the control module 1120 may include: a first determination module 1121, and the first determination module 1121 is specifically configured to: determine the energy storage power regulation values corresponding to the at least two power distribution nodes respectively according to the real-time power of the at least two power distribution nodes, the preset energy storage device power regulation targets corresponding to the 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 charge-discharge dynamic capacity increase strategy, determine the minimum power regulation value as the first target power regulation value of the energy storage device in the next time period according to the energy storage power regulation 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 discharge-only dynamic capacity increase strategy, determine the minimum power regulation value as the first target power regulation value of the energy storage device in the next time period according to the energy storage power regulation values corresponding to the at least two power distribution nodes and a preset minimum power value.

[0233] In an alternative embodiment, at least one target-level distribution line in the multi-level distribution line is a plurality of parallel distribution lines; the target distribution device includes: an energy storage device; a first determination module 1121, specifically configured to: respectively determine the energy storage power adjustment values corresponding to at least two distribution nodes according to the real-time power of at least two distribution nodes, the power adjustment targets of the preset energy storage devices corresponding to the at least two distribution nodes, and the real-time power of the energy storage device; determine the first-level energy storage power adjustment value corresponding to the first-level distribution node according to the energy storage power adjustment values corresponding to the at least two distribution nodes, the real-time power and the power adjustment target of the first-level distribution node corresponding to the energy storage device; calculate the total energy storage power adjustment value according to the energy storage power adjustment values of the at least two distribution nodes; determine whether the energy storage power adjustment values corresponding to the at least two distribution nodes meet the preset distribution requirements according to the total energy storage power adjustment value and the first-level energy storage power adjustment value; if the preset distribution requirements are met, determine the maximum value among the energy storage power adjustment values corresponding to the at least two distribution nodes as the first target power adjustment value of the energy storage device in the next time period; if the preset distribution requirements are not met, obtain the secondary energy storage power adjustment values of the at least two distribution nodes; determine the secondary energy storage power adjustment values of the at least two distribution nodes as the first target power adjustment value of the energy storage device in the next time period.

[0234] In an alternative embodiment, the first determination module 1121 is specifically configured to: obtain the adjustment amplitude of each distribution node according to the energy storage power adjustment values corresponding to at least two distribution nodes, the first-level energy storage power adjustment value corresponding to the first-level distribution node, and the preset number of distribution nodes; determine the secondary energy storage power adjustment values of the at least two distribution nodes according to the adjustment amplitude of each distribution node, the energy storage power adjustment values corresponding to the at least two distribution nodes, and the preset maximum output power value of the energy storage device.

[0235] In an alternative embodiment, the target distribution device includes: a charging device; the first determination module 1121 is specifically configured to: determine whether the preset maximum output power value of the energy storage device meets the preset distribution capacity increase requirement when outputting according to the real-time power of at least two distribution nodes, the power adjustment targets of the preset charging devices corresponding to the 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; if the preset distribution capacity increase requirement is not met, determine the second target power adjustment value of the charging device in the next time period according to the real-time power of the charging device, the real-time power of at least two distribution nodes, the preset charging power adjustment targets corresponding to the 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.

[0236] In an alternative embodiment, the control module 1120 may include: a second determination module 1122, which is specifically configured to: determine the charging power adjustment values corresponding to at least two power distribution nodes respectively according to the real-time power of at least two power distribution nodes, the preset charging power adjustment targets 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 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 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 increase 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 increase requirement is met.

[0237] In an alternative embodiment, the second determination module 1122 is further configured to: if the preset power distribution capacity increase requirement is met, determine a second target power adjustment value of the charging device in the next time period according to the charging demand power of the device to be charged connected to the charging device.

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

[0239] The above modules may be one or more integrated circuits configured to implement the above methods, such as: one or more application specific integrated circuits (ASICs), or, one or more microprocessors, or, one or more field programmable gate arrays (FPGAs), etc. Again, when the above certain module is implemented in the form of a processing element scheduling program code, the processing element may be a general-purpose processor, such as a central processing unit (CPU) or other processors that can call program code. Again, these modules may be integrated together and implemented in the form of a system-on-a-chip (SOC).

[0240] Optionally, the embodiments of the present application further provide a readable storage medium, on which a computer program is stored. When the computer program is run by a processor, the processor executes the steps of the control method of the optical storage charging system of the mobile storage medium in the above embodiments. The specific implementation manners and technical effects are similar and will not be elaborated here.

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

[0242] The above integrated unit implemented in the form of a software functional unit can be stored in a computer-readable storage medium. The above software functional unit stored in a storage medium includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor (English: processor) to execute some steps of the methods described in various embodiments of the present application. The foregoing storage medium includes: various media such as a USB flash drive, a mobile hard disk, a read-only memory (English: Read-Only Memory, abbreviated as: ROM), a random access memory (English: Random Access Memory, abbreviated as: RAM), a magnetic disk, or an optical disc that can store program codes.

[0243] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered by the protection scope of the present application.

Claims

1. A control method for a solar storage and charging system, characterized in that: The photovoltaic storage and charging system comprises: a multi-level distribution line; wherein each distribution line in the multi-level distribution line is provided with a distribution node and a corresponding distribution collection point; the target distribution line in the multi-level distribution line is electrically connected to each distribution device; the method comprises: Acquire the real-time power of at least two distribution nodes in the solar-storage-charging system and the real-time power of the target distribution equipment, wherein each distribution node is located in a distribution line where the target distribution equipment is located; The target power distribution equipment is power controlled according to the real-time power of the at least two power distribution nodes, the preset energy storage power regulation targets corresponding to the at least two power distribution nodes, and the real-time power of the target power distribution equipment.

2. The control method of the photovoltaic storage and charging system according to claim 1, characterized in that: The target power distribution equipment includes: an energy storage device and / or a charging device; the power control of the target power distribution equipment according to the real-time power of the at least two power distribution nodes, the 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 equipment includes: Determine a target power adjustment value of the target power distribution equipment in the next time period according to the real-time power of the at least two power distribution nodes, the power adjustment targets of the preset target power distribution equipment corresponding to the at least two power distribution nodes, and the real-time power of the target power distribution equipment; Power control is performed on the target power distribution equipment according to the target power adjustment value.

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

4. The control method of the photovoltaic storage and charging system according to claim 2, characterized in that: At least one target-level distribution circuit among the multi-level distribution circuits is a plurality of distribution circuits connected in parallel; The target power distribution equipment includes: an energy storage device; the determining of the target power adjustment value of the target power distribution equipment in the next time period according to the real-time power of the at least two power distribution nodes, the power adjustment target of the preset 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: Determine the energy storage power adjustment values ​​corresponding to the at least two power distribution nodes respectively according to the real-time power of the at least two power distribution nodes, the power adjustment targets of the preset energy storage devices corresponding to the at least two power distribution nodes, and the real-time power of the energy storage devices; Determine the primary energy storage power adjustment value corresponding to the primary distribution node according to the energy storage power adjustment values ​​corresponding to the 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; Calculating a total energy storage power adjustment value according to the energy storage power adjustment values ​​of the at least two power distribution nodes; Determining, according to the total energy storage power adjustment value and the first-level energy storage power adjustment value, 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 requirement is met, determining the maximum value of the energy storage power adjustment values ​​of the at least two power distribution nodes as the first target power adjustment value of the energy storage device in the next time period; If the preset power distribution requirement is not met, obtaining the energy storage power secondary adjustment value of the at least two power distribution nodes; Determine the energy storage power secondary adjustment value of the at least two power distribution nodes as the first target power adjustment value of the energy storage device in the next time period.

5. The control method of the photovoltaic storage and charging system according to claim 4, characterized in that: The obtaining of the secondary adjustment value of the energy storage power of the at least two power distribution nodes includes: Obtaining an adjustment range of each distribution node according to the energy storage power adjustment values ​​corresponding to the 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; The energy storage power secondary adjustment values ​​of the at least two distribution nodes are determined according to the adjustment amplitude of each distribution node, the energy storage power adjustment values ​​corresponding to the at least two distribution nodes, and the preset maximum output power value of the energy storage device.

6. The control method of the photovoltaic storage and charging system according to claim 2, characterized in that: The target power distribution equipment includes: a charging device; the determining of a target power adjustment value of the target power distribution equipment in the next time period according to the real-time power of the at least two power distribution nodes, the power adjustment target of the preset 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: Determine whether the preset maximum output power value of the energy storage device meets the preset power distribution capacity increase requirement when output according to the real-time power of the at least two power distribution nodes, the power regulation target of the preset 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; If the preset power distribution capacity increase demand is not met, 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 distribution nodes, the preset charging power adjustment targets corresponding to the 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.

7. The control method of the photovoltaic storage and charging system according to claim 6, characterized in that: The determining, based on the real-time power of the at least two power distribution nodes, the preset charging power adjustment targets 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, whether the preset maximum output power value of the energy storage device meets the preset power distribution capacity increase requirement when output, includes: Determine charging power adjustment values ​​corresponding to the at least two distribution nodes respectively according to the real-time power of the at least two distribution nodes, the preset charging power adjustment targets corresponding to the 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; Determining whether a 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 a 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 increase requirement is 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 increase requirement is met.

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

9. A microgrid controller, characterized in that: include: A processor, a storage medium and a bus, wherein 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 of the photovoltaic charging and storage system as described in any one of claims 1 to 8.

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

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