Control method of optical storage system, optical storage system and electronic device

Abstract

The application provides a control method of a light storage system, the light storage system and an electronic device, and relates to the technical field of light storage. The method comprises the following steps: acquiring a first operation parameter of a local terminal for a current moment, a second operation parameter of a light storage controller for the current moment and third operation parameters of each remote terminal for the current moment, and calculating a first line impedance coefficient of the light storage system according to the first operation parameter, the second operation parameter and the third operation parameters; and determining a second system compensation current of the light storage system at a next moment according to the first line impedance coefficient, so that the second system compensation current can be used to control a first inverter module DCDC output corresponding second system compensation voltage in the light storage power supply system, the corresponding second system operation efficiency of the light storage system at the next moment meets the preset compensation requirement, that is, the light storage system is ensured to be in a working state with high system operation efficiency, and the power supply efficiency of the light storage system can be improved.

Description

Technical Field

[0001] This application relates to the field of photovoltaic energy storage technology, and in particular to a control method for a photovoltaic energy storage system, a photovoltaic energy storage system, and electronic equipment. Background Technology

[0002] A road testing system is a collective term for a series of testing devices used in roadside testing. Based on a geospatial database, it employs spatial model analysis methods to provide various dynamic spatial information in real time. Its main functions include timely testing of information such as latitude and longitude, spatial planning, graphic structure, and weather conditions along the road. Road testing systems developed specifically for highways based on existing road testing systems can be called highway road testing systems.

[0003] In the existing technology, the power supply for each road testing device in the highway road testing system is often provided through a DC remote power supply network.

[0004] However, since the power supply method of DC remote power supply network is relatively simple, the power supply efficiency of photovoltaic energy storage system is often low during the power supply process. Summary of the Invention

[0005] The purpose of this application is to address the shortcomings of the prior art by providing a control method, a photovoltaic energy storage system, and electronic equipment that can improve power supply efficiency.

[0006] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows: In a first aspect, the present invention provides a control method for a photovoltaic energy storage system, the method comprising: Obtain the first operating parameters of the central office unit for the current time, the second operating parameters of the optical storage controller for the current time, and the third operating parameters of each remote unit for the current time; Based on the first operating parameters, the second operating parameters, and the third operating parameters, the first line impedance coefficient of the photovoltaic energy storage system is calculated. The first line impedance coefficient is used to characterize the ratio of the line impedance between the central office and the first remote unit set in the first remote unit system to the line impedance between the central office and the photovoltaic energy storage power supply system. The first remote unit set includes at least one remote unit between the central office and the feedforward sampling point. Based on the first line impedance coefficient, the second system compensation current of the photovoltaic-storage system at the next moment is determined, and the compensation command is sent to the first inverter module DC-CDC in the photovoltaic-storage power supply system, so that when the first inverter module DC-CDC outputs the second system compensation voltage after receiving the compensation command, the second system operating efficiency of the photovoltaic-storage system at the next moment meets the preset compensation requirements, wherein the photovoltaic-storage system includes the photovoltaic-storage power supply system.

[0007] In an optional implementation, each of the third operating parameters includes: the operating current of each remote unit; and determining the second system compensation current of the optical storage system at the next moment based on the first line impedance coefficient includes: Based on the operating current of each remote unit at the current moment, calculate the first total operating current of the first remote unit set at the current moment; Based on the first line impedance coefficient and the first total operating current, the second system compensation current of the photovoltaic energy storage system at the next moment is determined.

[0008] In an optional implementation, calculating the first line impedance coefficient of the photovoltaic-storage system based on the first operating parameter, the second operating parameter, and the third operating parameter includes: Based on the first operating parameters, the second operating parameters, and the third operating parameters, the first sub-line impedance and the second sub-line impedance of the photovoltaic energy storage system are obtained respectively, wherein the first sub-line impedance is the equivalent line impedance between the central office unit and the first remote unit set, and the second sub-line impedance is the equivalent line impedance between the first remote unit set and the photovoltaic energy storage power supply system. Calculate the first line impedance coefficient of the photovoltaic energy storage system based on the first sub-line impedance and the second sub-line impedance.

[0009] In an optional implementation, the first operating parameter includes: a first output voltage and a first current parameter; the second operating parameter includes: a second output voltage; and the third operating parameter includes: the operating current and operating voltage of each remote unit. The step of obtaining the first sub-line impedance and the second sub-line impedance of the photovoltaic energy storage system based on the first operating parameter, the second operating parameter, and the third operating parameter includes: Based on the operating current of each remote unit at the current moment, calculate the first total operating current of the first remote unit set at the current moment; Based on the operating voltage of each remote unit at the current moment, calculate the average operating voltage of the first remote unit set at the current moment; The impedance of the first sub-line is calculated based on the first output voltage, the average operating voltage, and the first current parameter. The impedance of the second sub-line is calculated based on the second output voltage, the average operating voltage, the first total operating current, and the first current parameter.

[0010] Secondly, the present invention provides a control method for a photovoltaic energy storage system, applied to a photovoltaic energy storage controller in the photovoltaic energy storage system, the method comprising: The cloud controller receives the second system compensation current of the optical storage system at the next moment, which is sent by the cloud controller based on the first line impedance coefficient of the optical storage system. The first line impedance coefficient is determined by the cloud controller based on the first operating parameters of the central office unit for the current moment, the second operating parameters of the optical storage controller for the current moment, and the third operating parameters of each remote unit for the current moment. The first line impedance coefficient is used to characterize the ratio of the line impedance between the central office unit and the first remote unit set in the first remote unit system to the line impedance between the central office unit and the optical storage power supply system. The first remote unit set includes at least one remote unit between the central office unit and the feedforward sampling point. The compensation command is determined based on the compensation current of the second system, and the compensation command is sent to the first inverter module DC-CDC in the photovoltaic-storage power supply system, so that when the first inverter module DC-CDC outputs the compensation voltage of the second system after receiving the compensation command, the operating efficiency of the second system of the photovoltaic-storage system at the next moment meets the preset compensation requirements. The photovoltaic-storage system includes the photovoltaic-storage power supply system.

[0011] Thirdly, the present invention provides a control method for a photovoltaic energy storage system, applied to a cloud controller, the method comprising: Obtain the first operating parameters of the central office unit for the current time, the second operating parameters of the optical storage controller for the current time, and the third operating parameters of each remote unit for the current time; Based on the first operating parameters, the second operating parameters, and the third operating parameters, the first line impedance coefficient of the photovoltaic energy storage system is calculated. The first line impedance coefficient is used to characterize the ratio of the line impedance between the central office and the first remote unit set in the first remote unit system to the line impedance between the central office and the photovoltaic energy storage power supply system. The first remote unit set includes at least one remote unit between the central office and the feedforward sampling point. Based on the first line impedance coefficient, the second system compensation current of the photovoltaic-storage system at the next moment is determined, and the second system compensation current is sent to the photovoltaic-storage controller in the photovoltaic-storage power supply system, so that the photovoltaic-storage controller determines the compensation command based on the second system compensation current and sends the compensation command to the first inverter module DC-DC in the photovoltaic-storage power supply system. The photovoltaic-storage system includes the photovoltaic-storage power supply system. When the first inverter module DC-DC outputs the second system compensation voltage after receiving the compensation command, the second system operating efficiency of the photovoltaic-storage system at the next moment meets the preset compensation requirements. The photovoltaic-storage system includes the photovoltaic-storage power supply system.

[0012] Fourthly, the present invention provides a photovoltaic energy storage system, comprising: a central office unit, a remote unit system, and a photovoltaic energy storage power supply system; The remote unit system includes multiple remote units. The input terminal of the central office unit is electrically connected to an AC voltage network. The output terminal of the central office unit is electrically connected to each of the remote units respectively. The optical energy storage power supply system is connected in parallel with each of the remote units through feedforward sampling points between the multiple remote units. The photovoltaic-storage power supply system includes: a photovoltaic panel module, a photovoltaic-storage controller, a maximum power point tracking control solar controller (MPPT), an energy storage battery, and a first inverter module (DCCDC). The power output terminal of the photovoltaic panel module is electrically connected to the input terminal of the MPPT, the output terminal of the MPPT is electrically connected to the input terminal of the energy storage battery, the output terminal of the energy storage battery is electrically connected to the output terminal of the first inverter module (DCCDC), and the control terminal of the first inverter module (DCCDC) is electrically connected to the first control terminal of the photovoltaic-storage controller. The photovoltaic-storage controller is used to perform the steps as described in the aforementioned embodiments.

[0013] In an optional implementation, the remote units include N units, wherein NM remote units are powered by the optical-storage power supply system, and M remote units are powered by the central office unit, or are powered by the central office unit and the optical-storage power supply system, where N and M are integers greater than 1, and the difference between N and M is greater than 1.

[0014] In an optional implementation, the central office unit includes a second inverter module ACDC and a first controller, and each remote unit includes a third inverter module DCAC, a second controller, and a terminal load, wherein the terminal load is a drive-test terminal.

[0015] Fifthly, the present invention provides an electronic device, comprising: a processor, a storage medium, and a bus, wherein the storage medium stores machine-readable instructions executable by the processor, and when the electronic device 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 optical storage system as described in any of the foregoing embodiments.

[0016] In a sixth aspect, the present invention provides a computer-readable storage medium storing a computer program, which, when executed by a processor, performs the steps of the control method for the optical storage system as described in any of the foregoing embodiments.

[0017] The beneficial effects of this application are: The control method, system, and electronic device for the photovoltaic-storage system provided in this application include: acquiring first operating parameters of the central office unit (COU) for the current time, second operating parameters of the COU controller for the current time, and third operating parameters of each remote unit for the current time; calculating a first line impedance coefficient of the photovoltaic-storage system based on the first, second, and third operating parameters, wherein the first line impedance coefficient characterizes the ratio of the line impedance between the COU and the first remote unit set in the first remote unit system to the line impedance between the COU and the photovoltaic-storage power supply system, and the first remote unit set includes at least one remote unit between the COU and the feedforward sampling point; determining the second system compensation current of the photovoltaic-storage system at the next time moment based on the first line impedance coefficient, and transmitting it to the COU. In the photovoltaic-storage power supply system, the first inverter module DC-DC sends a compensation command so that when the first inverter module DC-DC outputs the second system compensation voltage after receiving the compensation command, the operating efficiency of the second system of the photovoltaic-storage system at the next moment meets the preset compensation requirements. By applying the embodiments of this application, it is possible to determine the second system compensation current of the photovoltaic-storage system at the next moment based on the first line impedance coefficient of the photovoltaic-storage system. Then, based on the second system compensation current, the output of the corresponding second system compensation voltage of the first inverter module DC-DC can be controlled, so that the operating efficiency of the second system of the photovoltaic-storage system at the next moment meets the preset compensation requirements. That is, it ensures that the photovoltaic-storage system is in a working state with high system operating efficiency, which can improve the power supply efficiency of the photovoltaic-storage system. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A power supply architecture diagram provided for an embodiment of this application; Figure 2 A schematic flowchart illustrating a control method for a photovoltaic energy storage system provided in an embodiment of this application; Figure 3 A flowchart illustrating another control method for a photovoltaic energy storage system provided in an embodiment of this application; Figure 4 A flowchart illustrating another control method for a photovoltaic energy storage system provided in an embodiment of this application; Figure 5 A flowchart illustrating another control method for a photovoltaic energy storage system provided in an embodiment of this application; Figure 6 A schematic diagram of a photovoltaic energy storage system provided in an embodiment of this application; Figure 7 This is an equivalent schematic diagram of a photovoltaic energy storage system provided in an embodiment of this application; Figure 8 Simulation results of another control method for a photovoltaic energy storage system provided in an embodiment of this application; Figure 9 A flowchart illustrating another control method for a photovoltaic energy storage system provided in an embodiment of this application; Figure 10 This is a schematic diagram of an electronic device structure provided in an embodiment of this application. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the existing technology, when using a DC remote power supply network to supply power to various test devices, long-distance transmission lines are often involved, and the resistance of long-distance transmission lines will generate certain line losses. Therefore, the existing power supply method has the problem of low power supply efficiency.

[0024] Figure 1 A power supply architecture diagram is provided for an embodiment of this application, such as... Figure 1 As shown in the diagram, the power supply architecture may include a cloud controller (not shown) and a photovoltaic energy storage system. Optionally, the cloud controller may be deployed in a cloud server. The photovoltaic energy storage system may include a central office unit 121, a remote unit system 122, and a photovoltaic energy storage power supply system 123. The cloud controller 11 may communicate with the central office unit 121, the remote unit system 122, and the photovoltaic energy storage power supply system 123 respectively.

[0025] The aforementioned remote unit system 122 includes multiple remote units 1221. The input terminal of the central office unit 121 is electrically connected to the AC voltage network 13, and the output terminal of the central office unit 121 is electrically connected to each remote unit 1221. The optical energy storage power supply system 123 is connected in parallel with each remote unit 1221 through the feedforward sampling point A between the multiple remote units 1221. Each remote unit 1221 exhibits line power supply and point distribution characteristics. In addition, it should be noted that the output terminal of the central office unit 121 is a DC voltage network (e.g., 750V or 375V) to improve the long-distance power supply capability.

[0026] The aforementioned photovoltaic-storage power supply system 123 includes: a photovoltaic panel module 1231, a photovoltaic-storage controller 1232, a maximum power point tracking (MPPT) solar controller 1233, an energy storage battery 1234, and a first inverter module DC-DC converter 1235. The power output terminal of the photovoltaic panel module 1231 is electrically connected to the input terminal of the MPPT 1233, the output terminal of the MPPT 1233 is electrically connected to the input terminal of the energy storage battery 1234, the output terminal of the energy storage battery 1234 is electrically connected to the output terminal of the first inverter module DC-DC converter 1235, and the control terminal of the first inverter module DC-DC converter 1235 is electrically connected to the first control terminal of the photovoltaic-storage controller 1232. The MPPT 1233 is used to calculate the output power of the photovoltaic panel module 1231 and achieve maximum power point tracking; the first inverter module DC-DC converter 1235 is used to convert the DC power output from the energy storage battery 1234 into DC power corresponding to each remote unit. In addition, it should be noted that the photovoltaic energy storage controller can be pre-configured with a compensation mapping table, which includes the mapping relationship between system compensation current and system compensation voltage.

[0027] It should be noted that this application does not limit the number of photovoltaic-storage power supply systems 123, and may include one or more depending on the actual application scenario. Furthermore, this application does not limit the connection relationship between the MPPT1233, the energy storage battery 1234, and the photovoltaic-storage controller 1232. In some embodiments, the control terminal of the MPPT1233 can be electrically connected to the second control terminal of the photovoltaic-storage controller 1232 to achieve data communication between the two; optionally, the control terminal of the energy storage battery 1234 can also be electrically connected to the third control terminal of the photovoltaic-storage controller 1232 to monitor the health status of the energy storage battery 1234 by monitoring its state.

[0028] Figure 2 This is a flowchart illustrating a control method for a photovoltaic storage system provided in an embodiment of this application. The execution entity of this method can be either the aforementioned cloud controller or the aforementioned photovoltaic storage controller; no limitation is made here. For a better understanding of this application, the following embodiments are described using a cloud controller as the execution entity. Figure 2As shown, the method may include: S101. Obtain the first operating parameters of the central office unit for the current time, the second operating parameters of the optical storage controller for the current time, and the third operating parameters of each remote unit for the current time.

[0029] The current time can be any moment during the normal operation of the photovoltaic-storage system, such as the 1st minute, 10th minute, or 1st hour after the system starts up normally; there is no limitation here. During the operation of the photovoltaic-storage system, the central office unit, the photovoltaic-storage controller, and each remote unit can collect their respective operating parameters in real time and send these parameters to the cloud controller. Optionally, each operating parameter may include corresponding voltage parameters, current parameters, power parameters, etc., which are not limited here. Taking the first operating parameter as an example, optionally, the first operating parameter may include: the first output voltage parameter and the first current parameter of the central office unit; of course, the specific parameter categories are not limited to this.

[0030] S102. Calculate the first line impedance coefficient of the photovoltaic energy storage system based on the first operating parameters, the second operating parameters, and the third operating parameters.

[0031] The first line impedance coefficient is used to characterize the ratio of the line impedance between the central office and the first remote unit set in the first remote unit system to the line impedance between the central office and the photovoltaic-storage power supply system. The first remote unit set includes at least one remote unit between the central office and the feedforward sampling point. Of course, this application does not limit the number of remote units in the first remote unit set; depending on the actual application scenario, it may include 5, 10, 30, etc.

[0032] After obtaining the first, second, and third operating parameters, the cloud controller can further calculate the ratio of the line impedance between the central office unit and the first remote unit set to the line impedance between the central office unit and the photovoltaic power supply system based on the relationship between these three parameters.

[0033] S103. Based on the first line impedance coefficient, determine the second system compensation current of the photovoltaic-storage system at the next moment, and send a compensation command to the first inverter module DC-DC in the photovoltaic-storage power supply system so that when the first inverter module DC-DC outputs the second system compensation voltage after receiving the compensation command, the operating efficiency of the second system of the photovoltaic-storage system at the next moment meets the preset compensation requirements.

[0034] The compensation command carries the second system compensation voltage corresponding to the current moment.

[0035] Optionally, the time interval between the current moment and the previous moment can be 15 seconds, 30 seconds, 1 minute, etc., without limitation, and can be flexibly set according to the actual application scenario.

[0036] In some embodiments, the cloud controller can be configured to include preset compensation logic between the first line impedance coefficient and the system compensation current. Based on this preset compensation logic, after obtaining the first line impedance coefficient, the second system compensation current of the photovoltaic-storage system at the next moment can be calculated. The obtained second system compensation current can be sent to the photovoltaic-storage controller in the photovoltaic-storage power supply system. The photovoltaic-storage controller determines a compensation command carrying the second system compensation voltage corresponding to the current moment based on the second system compensation current, and sends the compensation command to the first inverter module DC-DC converter. Then, the first inverter module DC-DC converter can output the corresponding second system compensation voltage accordingly. Optionally, the photovoltaic-storage controller can be pre-configured with a compensation mapping table, and the determination of the compensation command can be made by the photovoltaic-storage controller based on the compensation mapping table.

[0037] The output second system compensation voltage can be used to power some of the remote units in the remote unit system, thereby ensuring that the second system operating efficiency of the photovoltaic-storage system meets the preset compensation requirements at the next moment. It can be understood that the second system operating efficiency characterizes the power supply efficiency of the photovoltaic-storage system at the current moment. It can be understood that higher system operating efficiency can reduce power supply costs and achieve energy conservation and emission reduction goals.

[0038] Optionally, the preset compensation requirement can be that the operating efficiency of the second system is greater than the preset system operating efficiency, thus ensuring that the photovoltaic storage system always operates at a high system operating efficiency. Alternatively, the preset compensation requirement can be that the difference between the operating efficiency of the second system and the preset system operating efficiency is less than a preset threshold, thus ensuring that the photovoltaic storage system always operates at a high system operating efficiency. Furthermore, this avoids frequent compensation control operations and reduces the power consumption of the cloud controller and the photovoltaic storage controller. Optionally, the preset system operating efficiency can be determined through empirical values.

[0039] Furthermore, it should be noted that the operating efficiency of the second system at the next moment can be obtained by calculating the ratio of the total load input power to the total power input at the next moment. Specifically, the total load input power can be obtained by summing the third input power transmitted by each remote unit, and the total power input power can be obtained by summing the input power of the central office unit and the input power of the power supply system. The operating efficiency of the second system can be any value between 0 and 1; there is no specific limitation on the value, and it may vary depending on the actual application scenario.

[0040] It should be noted that this application does not limit the number of remote units that can be powered by the second system compensation voltage, and the number may vary depending on the power supply voltage required by each remote unit.

[0041] In summary, this application provides a control method for a photovoltaic-storage system. The method includes: acquiring first operating parameters of the central office unit (COU) for the current time, second operating parameters of the photovoltaic-storage controller for the current time, and third operating parameters of each remote unit for the current time; calculating a first line impedance coefficient of the photovoltaic-storage system based on the first, second, and third operating parameters. The first line impedance coefficient characterizes the ratio of the line impedance between the COU and a set of first remote units in the first remote unit system to the line impedance between the COU and the photovoltaic-storage power supply system. The set of first remote units includes at least one remote unit between the COU and a feedforward sampling point; determining a second system compensation current for the photovoltaic-storage system at the next time moment based on the first line impedance coefficient, and supplying the second system compensation current to the photovoltaic-storage system. The first inverter module DC-DC in the power supply system sends a compensation command so that when the first inverter module DC-DC outputs the second system compensation voltage after receiving the compensation command, the operating efficiency of the second system of the photovoltaic energy storage system at the next moment meets the preset compensation requirements. By applying the embodiments of this application, it is possible to determine the second system compensation current of the photovoltaic energy storage system at the next moment based on the first line impedance coefficient of the photovoltaic energy storage system. Then, based on the second system compensation current, the output of the corresponding second system compensation voltage of the first inverter module DC-DC can be controlled so that the operating efficiency of the second system of the photovoltaic energy storage system at the next moment meets the preset compensation requirements. That is, it ensures that the photovoltaic energy storage system is in a working state with high system operating efficiency, which can improve the power supply efficiency of the photovoltaic energy storage system.

[0042] Furthermore, it should be noted that the photovoltaic-storage system introduced in this application embodiment enables the addition of a photovoltaic-storage power supply system to the existing DC remote power supply network. The photovoltaic-storage power supply system can be installed locally near the remote units in a distributed manner. Compared with the existing technology that only uses the DC remote power supply network for power supply, the transmission lines can be shortened, thereby effectively improving the efficiency of the photovoltaic-storage system. Moreover, the photovoltaic-storage power supply system has the characteristics of flexible deployment and can effectively support the upgrade of the remote units, such as upgrading the terminal load in the remote units, which has the characteristics of strong applicability.

[0043] Figure 3 This is a flowchart illustrating another control method for a photovoltaic energy storage system provided in an embodiment of this application. Optionally, each third operating parameter includes: the operating current of each remote unit. For example... Figure 3 As shown, the determination of the second system compensation current of the photovoltaic energy storage system at the next moment based on the first line impedance coefficient includes: S201. Calculate the first total operating current of the first remote unit set at the current moment based on the operating current of each remote unit at the current moment.

[0044] The first total operating current of the first remote unit set at the current moment can be obtained by summing the operating currents of each remote unit in the first remote unit set.

[0045] For example, the first set of remote machines includes N remote machines. The operating current of the i-th remote machine at the current moment is IL_LC_i, where i takes values ​​from 1 to N. Let the first total operating current be IL_total_LCS1, then IL_total_LCS1 = .

[0046] S202. Based on the first line impedance coefficient and the first total operating current, determine the second system compensation current of the photovoltaic energy storage system at the next moment.

[0047] In specific calculations, the second system compensation current of the photovoltaic energy storage system at the next moment can be obtained by multiplying the first line impedance coefficient and the first total operating current.

[0048] Wherein, the impedance coefficient of the first line is denoted as The first total operating current (IL_total_LCS1) of the first remote unit assembly at the current moment, and the second system compensation current of the photovoltaic-storage system at the next moment are... The relationship between these three can be expressed as: .

[0049] Figure 4 This is a flowchart illustrating another control method for a photovoltaic energy storage system provided in an embodiment of this application. Optionally, as... Figure 4 As shown, the calculation of the first line impedance coefficient of the photovoltaic-storage system based on the first operating parameter, the second operating parameter, and the third operating parameter includes: S301. Based on the first operating parameter, the second operating parameter, and the third operating parameter, obtain the first sub-line impedance and the second sub-line impedance of the photovoltaic energy storage system, respectively.

[0050] The first sub-line impedance is the equivalent line impedance between the central office unit and the first remote unit assembly, and the second sub-line impedance is the equivalent line impedance between the first remote unit assembly and the photovoltaic-storage power supply system.

[0051] In specific calculations, the impedance of the first sub-line can be calculated based on the first and third operating parameters, and the impedance of the second sub-line can be calculated based on the first, second, and third operating parameters.

[0052] In addition, it should be noted that the values ​​of the first sub-line impedance and the second sub-line impedance can be the same or different, and no limitation is made here.

[0053] S302. Calculate the first line impedance coefficient of the photovoltaic energy storage system based on the first sub-line impedance and the second sub-line impedance.

[0054] In the specific calculation, the first equivalent line impedance can be calculated first based on the first sub-line impedance and the second sub-line impedance; then, the ratio of the first sub-line impedance to the first equivalent line impedance is calculated as the first line impedance coefficient of the optical energy storage system.

[0055] Wherein, the impedance of the first sub-circuit is denoted as Second sub-circuit impedance The first line impedance coefficient of the photovoltaic-storage system is The relationship between the three can be expressed as: .

[0056] Figure 5 This is a flowchart illustrating another control method for a photovoltaic energy storage system provided in an embodiment of this application. Optionally, the first operating parameters include: a first output voltage and a first current parameter; the second operating parameters include: a second output voltage; and the third operating parameters include: the operating current and operating voltage of each remote unit.

[0057] like Figure 5 As shown, the acquisition of the first sub-line impedance and the second sub-line impedance of the photovoltaic-storage system based on the first operating parameter, the second operating parameter, and the third operating parameter includes: S401. Calculate the first total operating current of the first remote unit set at the current moment based on the operating current of each remote unit at the current moment.

[0058] For details on this step, please refer to the relevant content of step S201 above, which will not be repeated here.

[0059] S402. Calculate the average operating voltage of the first set of remote units at the current time based on the operating voltage of each remote unit at the current time.

[0060] S403. Calculate the impedance of the first sub-circuit based on the first output voltage, average operating voltage, and first current parameters.

[0061] In the specific calculation, the first voltage difference between the first output voltage and the average operating voltage can be calculated first. Based on the ratio of the first voltage difference to the first current parameter, the impedance of the first sub-circuit can be obtained.

[0062] Wherein, the impedance of the first sub-circuit is denoted as Given the first output voltage as UDC_JDJ, the average operating voltage as UDCL_AVE_LCS1, and the first current parameter as IDC_JDJ, the impedance of the first sub-circuit is... The following formula can be used to calculate it: =(UDC_JDJ-UDCL_AVE_LCS1) / IDC_JDJ.

[0063] S404. Calculate the impedance of the second sub-circuit based on the second output voltage, average operating voltage, first total operating current, and first current parameters.

[0064] In the specific calculation, the second voltage difference between the second output voltage and the average operating voltage can be calculated first; then, the second current difference between the first total operating current and the first current parameter can be calculated; based on the ratio of the second voltage difference to the second current difference, the impedance of the second sub-circuit can be obtained.

[0065] Among them, the impedance of the second sub-circuit is recorded. Given that the second output voltage is UDC_PVES1, the average operating voltage is UDCL_AVE_LCS1, the first total operating current is IL_total_LCS1, and the first current parameter is IDC_JDJ, then the impedance of the second sub-circuit... The following formula can be used to calculate it: (UDC_PVES1-UDCL_AVE_LCS1) / (IL_total_LCS1-IDC_JDJ).

[0066] By applying the embodiments of this application, the first sub-line impedance and the second sub-line impedance of the photovoltaic-storage system can be obtained based on the first operating parameter, the second operating parameter, and the third operating parameter, respectively. Based on this, the first line impedance coefficient of the photovoltaic-storage system can be obtained. This enables the analysis of the power supply efficiency of the photovoltaic-storage system from the perspective of line impedance. Through the compensation effect of the system compensation current, the photovoltaic-storage system can be ensured to continue to work at a high system operating efficiency, thereby improving the power supply efficiency of the photovoltaic-storage system.

[0067] Figure 6 This is a schematic diagram of a photovoltaic energy storage system provided in an embodiment of this application. Optionally, as... Figure 6As shown, the remote unit can include N units. NM remote units are powered by the photovoltaic-storage power supply system, and M remote units are powered individually by the central office unit, or jointly by the central office unit and the photovoltaic-storage power supply system. N and M are integers greater than 1, and the difference between N and M is greater than 1. It should be noted that at the current moment, whether the first to M remote units are powered individually by the central office unit or jointly by the central office unit and the photovoltaic-storage power supply system is determined by the second system compensation voltage output by the first inverter module (DCDC). The first resistor RL1 can be considered as the equivalent line impedance corresponding to the first to M remote units, and the second resistor RL2 can be considered as the equivalent line impedance corresponding to the (M+1)th to Nth remote units. It should be noted that during the compensation process, normally the NM remote units are powered by the photovoltaic-storage power supply system. However, in the event of an abnormality in the photovoltaic-storage power supply system, or when the energy storage of the photovoltaic-storage power supply system reaches its discharge limit and the system actively shuts down, the NM remote units are powered by the central office unit.

[0068] Figure 7 This is an equivalent schematic diagram of a photovoltaic energy storage system provided in an embodiment of this application. To better understand the compensation principle of this application, the following is combined with... Figure 7 The equivalent diagram shown is used for illustration. The first to M remote units are equivalent to the first equivalent device LCS1, and the (M+1)th to Nth remote units are equivalent to the second equivalent device LCS2. The first equivalent line impedance between the central office and the photovoltaic-storage power supply system is R1, and the second equivalent line impedance between the photovoltaic-storage power supply system and the second equivalent device LCS2 is R2. Furthermore, let the first line impedance coefficient be β, which represents the ratio of the line impedance between the central office and the first equivalent device LCS1 to the line impedance between the central office and the photovoltaic-storage power supply system. Therefore, the equivalent line impedance between the central office and the first equivalent device LCS1 can be denoted as β×R1, which is also the first sub-line impedance. The equivalent line impedance between the first equivalent device LCS1 and the photovoltaic-storage power supply system can be denoted as (1-β)×R1, which is also the second sub-line impedance.

[0069] Additionally, refer to Figure 7 As shown, the output current of the central office unit is I1, the input current of the first equivalent device LCS1 is I3, the current flowing through the second sub-line impedance is I2, the output current of the photovoltaic energy storage power supply system is I5, and the current flowing through the second equivalent line impedance R2 is I4. The relationship between these current parameters can be expressed as: I3=I1+I2, I5=I2+I4.

[0070] From the above relationships, it can be seen that when I2=0, the first to M remote units will be powered by the central office unit alone; while when I2≠0, assuming the coefficient between I1 and I3 is represented by α, that is, I1=α×I3, then I2=(1-α)×I3; based on this, by standardizing the first equivalent impedance R1 and the input current I3 of the first equivalent device LCS1, the power loss expression of the optical storage system on the first equivalent impedance R1 can be obtained: .in, The power loss generated by the central office supplying power to the first equivalent device LCS1. The power loss generated by the photovoltaic-storage power supply system when supplying power to the first equivalent device LCS1. This represents the power loss of the photovoltaic-storage system across the first equivalent impedance R1. Further, by minimizing this power loss expression, we can obtain... , that is At this time, the power loss of the photovoltaic energy storage system on the transmission line is minimal. It can be seen that the power supply current distribution of the central office unit and the photovoltaic energy storage power supply system as the first equivalent device LCS1 is linearly related to the impedance of the first sub-line. Therefore, when the impedance of the first sub-line can be identified, the power supply power of the photovoltaic energy storage power supply system for the first to M remote units can be adjusted accordingly. Considering that the impedance of the first sub-line can be represented by the first line impedance coefficient, in the actual compensation process, the cloud controller can determine the second system compensation current of the photovoltaic energy storage system at the next moment according to the first line impedance coefficient, and send the second system compensation current to the photovoltaic energy storage controller. This allows the photovoltaic energy storage controller to determine the compensation command according to the second system compensation current and send the compensation command to the first inverter module DCDC. Through this compensation adjustment, the power loss of the photovoltaic energy storage system is ultimately lower, that is, the power supply efficiency is higher.

[0071] In the specific compensation process, considering that the adjustment of the photovoltaic-storage power supply system is relatively simple and quick, this application embodiment achieves the purpose of compensating the photovoltaic-storage system by adjusting the second system compensation voltage corresponding to the first inverter module DC-DC in the photovoltaic-storage power supply system in real time, thereby ensuring that the photovoltaic-storage system is always in a working state with high system operating efficiency.

[0072] In addition, combined Figure 6 As can be seen, the feedforward sampling point can be set between the Mth remote unit and the (M+1)th remote unit, allowing the photovoltaic-storage power supply system to be connected in parallel with each remote unit through this feedforward sampling point. It should be noted that the selection of the feedforward sampling point can be based on the amount of power provided by the photovoltaic-storage power supply system.

[0073] Optionally, the central office unit includes a second inverter module (ACDC) and a first controller, and each remote unit includes a third inverter module (DCAC), a second controller, and a terminal load, which is a drive-tested terminal. The third inverter module (DCAC) is primarily used to convert the DC output from the second inverter module (ACDC) into the AC output required by the terminal load.

[0074] Optionally, the road test terminal can be a camera, sign, street light, or various data acquisition units, which may include temperature acquisition units, humidity acquisition units, noise acquisition units, pedestrian flow acquisition units, etc., without limitation.

[0075] In some embodiments, the aforementioned photovoltaic energy storage controller can be a PI controller. In particular, when performing power supply control, it can be implemented based on the PI controller. Specifically, when performing compensation control based on the PI controller, the calculated second system compensation current and the second output power of the first inverter module DC-DC at that time can be input into the PI controller. Then, the PI controller can control the first inverter module DC-DC to output the corresponding second system compensation voltage, thereby realizing closed-loop control of the operating efficiency of the photovoltaic energy storage system.

[0076] Figure 8 The simulation results of a control method for a photovoltaic energy storage system provided in this application are shown in the figure. Figure 8 (a) is a simulation diagram of the first subsystem compensation current flowing through the impedance of the first sub-line in a photovoltaic energy storage system. Figure 8 (b) is a simulation diagram of the compensation current of the second subsystem flowing through the impedance of the second sub-line in a photovoltaic energy storage system. Figure 8 (c) is a simulation diagram of the system operation efficiency of a photovoltaic energy storage system, where the horizontal axis represents time in seconds. Figure 8 (a) Figure 8 (b) The vertical axis represents the current, and the unit is A (ampere). Figure 8 (c) The vertical axis represents the system compensation power. In this embodiment, the impedance of the first sub-line and the impedance of the second sub-line are both 5Ω. As can be seen from the figure, when the ratio of the impedance of the first sub-line to the impedance of the second sub-line is 1:1, if the control method of the photovoltaic energy storage system of this application is applied, the ratio of the compensation current I1 of the first sub-system to the compensation current I2 of the second sub-system will be equal to the ratio of the impedance of the second sub-line to the impedance of the first sub-line. Then, from the perspective of time T1, I1:I2=1:1 (that is, |-10.7A| / 10.9A, where || represents the absolute value sign. It should be noted that due to the influence of the measurement direction on the actual measurement, the value of the compensation current I1 of the first sub-system measured here is negative). At this time, the system operating efficiency of the first photovoltaic energy storage system is improved by nearly 9% compared with the uncompensated time (corresponding to time T0).

[0077] Figure 9 A simulation result diagram of another control method for a photovoltaic energy storage system provided in this application embodiment is shown, wherein, Figure 9 (a) is a simulation diagram of the first subsystem compensation current flowing through the impedance of the first sub-line in another photovoltaic energy storage system. Figure 9 (b) is a simulation diagram of the compensation current of the second subsystem flowing through the impedance of the second sub-line in another type of photovoltaic energy storage system. Figure 9 (c) is a simulation diagram of the system operation efficiency of another type of photovoltaic energy storage system, where the horizontal axis represents time in seconds. Figure 9 (a) Figure 9 (b) The vertical axis represents the current, and the unit is A (ampere). Figure 9 (c) The vertical axis represents the system compensation power. In this embodiment, the impedance of the first sub-line is 2Ω and the impedance of the second sub-line is 5Ω. As can be seen from the figure, when the ratio of the impedance of the first sub-line to the impedance of the second sub-line is 2:5, if the control method of the photovoltaic energy storage system of this application is applied, the ratio of the compensation current I1 of the first sub-system to the compensation current I2 of the second sub-system will be equal to the ratio of the impedance of the second sub-line to the impedance of the first sub-line. Then, from the time T4, I1:I2=5:2 (that is, |-14.75A| / 6.06A, where || represents the absolute value sign. It should be noted that due to the influence of the measurement direction on the actual measurement, the value of the compensation current I1 of the first sub-system measured here is negative). At this time, the system operating efficiency of the first photovoltaic energy storage system is close to 2% higher than that without compensation (corresponding to time T3).

[0078] In summary, the greater the impedance of the first sub-line, the more significant the improvement in system efficiency obtained by applying the embodiments of this application.

[0079] Optionally, embodiments of this application also provide a control method for a photovoltaic energy storage system, which can be applied to the above-mentioned... Figure 1 The photovoltaic-storage controller in the power supply architecture may include: The system receives the second system compensation current of the photovoltaic storage system at the next moment, which is sent by the cloud controller based on the first line impedance coefficient of the photovoltaic storage system.

[0080] The first line impedance coefficient is determined by the cloud controller based on the first operating parameters of the central office unit for the current time, the second operating parameters of the optical storage controller for the current time, and the third operating parameters of each remote unit for the current time. The first line impedance coefficient is used to characterize the ratio of the line impedance between the central office unit and the first remote unit set in the first remote unit system to the line impedance between the central office unit and the optical storage power supply system. The first remote unit set includes at least one remote unit between the central office unit and the feedforward sampling point.

[0081] The compensation command is determined based on the compensation current of the second system, and the compensation command is sent to the first inverter module DC-CDC in the photovoltaic-storage power supply system so that when the first inverter module DC-CDC outputs the compensation voltage of the second system after receiving the compensation command, the operating efficiency of the second system of the photovoltaic-storage system at the next moment meets the preset compensation requirements.

[0082] The photovoltaic-storage system includes the photovoltaic-storage power supply system. It should be noted that the control method of the photovoltaic-storage controller during the power supply control process can be found in the aforementioned descriptions and will not be repeated here. Applying the embodiments of this application, it is possible to determine the second system compensation current of the photovoltaic-storage system at the next moment based on the first line impedance coefficient of the photovoltaic-storage system. Then, based on this second system compensation current, the photovoltaic-storage controller can control the first inverter module (DCDC) to output the corresponding second system compensation voltage. This ensures that the second system operating efficiency of the photovoltaic-storage system at the next moment meets the preset compensation requirements, that is, it ensures that the photovoltaic-storage system is in a high system operating efficiency state, thereby improving the power supply efficiency of the photovoltaic-storage system.

[0083] In some embodiments, it should also be emphasized that the second system compensation current of the photovoltaic energy storage system at the next moment can also be calculated by the photovoltaic energy storage controller. That is, this application does not limit the execution subject of the above steps S101 to S103.

[0084] Optionally, embodiments of this application also provide a control method for a photovoltaic energy storage system, which can be applied to a cloud controller, and the method may include: The first operating parameters of the central office unit for the current time, the second operating parameters of the optical storage controller for the current time, and the third operating parameters of each of the remote units for the current time are obtained. Based on the first operating parameters, the second operating parameters, and the third operating parameters, the first line impedance coefficient of the photovoltaic energy storage system is calculated. The first line impedance coefficient is used to characterize the ratio of the line impedance between the central office and the first remote unit set in the first remote unit system to the line impedance between the central office and the photovoltaic energy storage power supply system. The first remote unit set includes at least one remote unit between the central office and the feedforward sampling point. Based on the first line impedance coefficient, the second system compensation current of the photovoltaic-storage system at the next moment is determined, and the second system compensation current is sent to the photovoltaic-storage controller in the photovoltaic-storage power supply system, so that the photovoltaic-storage controller determines the compensation command based on the second system compensation current and sends the compensation command to the first inverter module DC-DC in the photovoltaic-storage power supply system. The photovoltaic-storage system includes the photovoltaic-storage power supply system. When the first inverter module DC-DC outputs the second system compensation voltage after receiving the compensation command, the second system operating efficiency of the photovoltaic-storage system at the next moment meets the preset compensation requirements. The photovoltaic-storage system includes the photovoltaic-storage power supply system.

[0085] It should be noted that when the control method of the photovoltaic storage system is applied to the cloud controller, its control process and technical effects can be found in the aforementioned relevant descriptions, and will not be repeated here.

[0086] Alternatively, refer to the above. Figure 1 This application also provides a photovoltaic energy storage system, which may include: a central office unit, a remote unit system, and a photovoltaic energy storage power supply system; The remote unit system includes multiple remote units. The input terminal of the central office unit is electrically connected to the AC voltage network, and the output terminal of the central office unit is electrically connected to each remote unit respectively. The optical energy storage power supply system is connected in parallel with each remote unit through the feedforward sampling points between the multiple remote units. The photovoltaic-storage power supply system includes: photovoltaic panel modules, a photovoltaic-storage controller, a maximum power point tracking control solar controller (MPPT), an energy storage battery, and a first inverter module (DC-CDC). The power output terminal of the photovoltaic panel modules is electrically connected to the input terminal of the MPPT, the output terminal of the MPPT is electrically connected to the input terminal of the energy storage battery, the output terminal of the energy storage battery is electrically connected to the output terminal of the first inverter module (DC-CDC), and the control terminal of the first inverter module (DC-CDC) is electrically connected to the first control terminal of the photovoltaic-storage controller. The photovoltaic-storage controller is used to execute the above-mentioned related steps.

[0087] It should be noted that the implementation principle and technical effect of the photovoltaic-storage controller in performing the above-mentioned steps are similar, and will not be repeated here. Furthermore, it should be noted that by applying the embodiments of this application, a photovoltaic-storage power supply system can be added to the existing DC remote power supply network. This system can be installed locally near the remote units in a distributed manner. Compared to the existing technology that only uses the DC remote power supply network for power supply, this shortens the transmission lines, effectively improving the efficiency of the photovoltaic-storage system. Moreover, the photovoltaic-storage power supply system has the characteristic of flexible deployment, effectively supporting the upgrade of remote units, such as upgrading the terminal loads in the remote units, demonstrating strong applicability.

[0088] These modules can be one or more integrated circuits configured to implement the above methods, such as one or more Application Specific Integrated Circuits (ASICs), one or more microprocessors, or one or more Field Programmable Gate Arrays (FPGAs). Alternatively, when a module is implemented using processing element scheduler code, the processing element can be a general-purpose processor, such as a Central Processing Unit (CPU) or other processor capable of calling program code. Furthermore, these modules can be integrated together as a system-on-a-chip (SOC).

[0089] Figure 10 This is a schematic diagram of an electronic device structure provided in an embodiment of this application. This electronic device can be integrated into the aforementioned cloud controller or optical storage controller, and is not limited thereto. Figure 10 As shown, the electronic device may include a processor 210, a storage medium 220, and a bus 230. The storage medium 220 stores machine-readable instructions executable by the processor 210. When the electronic device is running, the processor 210 communicates with the storage medium 220 via the bus 230, and the processor 210 executes the machine-readable instructions to perform the steps of the above method embodiment. The specific implementation and technical effects are similar and will not be described in detail here.

[0090] Optionally, this application also provides a storage medium storing a computer program, which, when run by a processor, executes the steps of the above-described method embodiments. The specific implementation and technical effects are similar and will not be repeated here.

[0091] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0092] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0093] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or in a combination of hardware and software functional units.

[0094] The integrated units implemented as software functional units described above can be stored in a computer-readable storage medium. These software functional units, stored in a storage medium, include several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute some steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0095] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element. The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application. It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need further definition and explanation in subsequent figures. The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A control method for a photovoltaic energy storage system, characterized in that, The method includes: Obtain the first operating parameters of the central office unit for the current time, the second operating parameters of the optical storage controller for the current time, and the third operating parameters of each remote unit for the current time; Based on the first operating parameters, the second operating parameters, and the third operating parameters, the first line impedance coefficient of the photovoltaic energy storage system is calculated. The first line impedance coefficient is used to characterize the ratio of the line impedance between the central office and the first remote unit set in the first remote unit system to the line impedance between the central office and the photovoltaic energy storage power supply system. The first remote unit set includes at least one remote unit between the central office and the feedforward sampling point. Based on the first line impedance coefficient, the second system compensation current of the photovoltaic energy storage system at the next moment is determined, and a compensation command is sent to the first inverter module DC-CDC in the photovoltaic energy storage power supply system so that when the first inverter module DC-CDC outputs the second system compensation voltage after receiving the compensation command, the second system operating efficiency of the photovoltaic energy storage system at the next moment meets the preset compensation requirements. The photovoltaic energy storage system includes the photovoltaic energy storage power supply system. The step of calculating the first line impedance coefficient of the photovoltaic-storage system based on the first operating parameter, the second operating parameter, and the third operating parameter includes: Based on the first operating parameters, the second operating parameters, and the third operating parameters, the first sub-line impedance and the second sub-line impedance of the photovoltaic energy storage system are obtained respectively, wherein the first sub-line impedance is the equivalent line impedance between the central office unit and the first remote unit set, and the second sub-line impedance is the equivalent line impedance between the first remote unit set and the photovoltaic energy storage power supply system. Calculate the first line impedance coefficient of the photovoltaic energy storage system based on the first sub-line impedance and the second sub-line impedance. The first operating parameter includes: a first output voltage and a first current parameter; the second operating parameter includes: a second output voltage; and the third operating parameter includes: the operating current and operating voltage of each remote unit. The step of obtaining the first sub-line impedance and the second sub-line impedance of the photovoltaic energy storage system based on the first operating parameter, the second operating parameter, and the third operating parameter includes: Based on the operating current of each remote unit at the current moment, calculate the first total operating current of the first remote unit set at the current moment; Based on the operating voltage of each remote unit at the current moment, calculate the average operating voltage of the first remote unit set at the current moment; The impedance of the first sub-line is calculated based on the first output voltage, the average operating voltage, and the first current parameter. The impedance of the second sub-line is calculated based on the second output voltage, the average operating voltage, the first total operating current, and the first current parameter.

2. The method according to claim 1, characterized in that, Each of the aforementioned third operating parameters includes: the operating current of each remote unit; the step of determining the second system compensation current of the optical storage system at the next moment based on the first line impedance coefficient includes: Based on the operating current of each remote unit at the current moment, calculate the first total operating current of the first remote unit set at the current moment; Based on the first line impedance coefficient and the first total operating current, the second system compensation current of the photovoltaic energy storage system at the next moment is determined.

3. A control method for a photovoltaic energy storage system, characterized in that, The method for a photovoltaic storage controller applied in a photovoltaic storage system includes: The cloud controller receives the second system compensation current of the optical storage system at the next moment, which is sent by the cloud controller based on the first line impedance coefficient of the optical storage system. The first line impedance coefficient is determined by the cloud controller based on the first operating parameters of the central office unit for the current moment, the second operating parameters of the optical storage controller for the current moment, and the third operating parameters of each remote unit for the current moment. The first line impedance coefficient is used to characterize the ratio of the line impedance between the central office unit and the first remote unit set in the first remote unit system to the line impedance between the central office unit and the optical storage power supply system. The first remote unit set includes at least one remote unit between the central office unit and the feedforward sampling point. The compensation command is determined according to the compensation current of the second system, and the compensation command is sent to the first inverter module DC-CDC in the photovoltaic-storage power supply system, so that when the first inverter module DC-CDC outputs the compensation voltage of the second system after receiving the compensation command, the operating efficiency of the second system of the photovoltaic-storage system at the next moment meets the preset compensation requirements. The photovoltaic-storage system includes the photovoltaic-storage power supply system. The first line impedance coefficient is specifically obtained by the cloud controller based on the first operating parameters, the second operating parameters, and the third operating parameters, respectively, to obtain the first sub-line impedance and the second sub-line impedance of the photovoltaic energy storage system. The first sub-line impedance is the equivalent line impedance between the central office unit and the first remote unit set, and the second sub-line impedance is the equivalent line impedance between the first remote unit set and the photovoltaic energy storage power supply system. Calculate the first line impedance coefficient of the photovoltaic energy storage system based on the first sub-line impedance and the second sub-line impedance. The first operating parameter includes: a first output voltage and a first current parameter; the second operating parameter includes: a second output voltage; and the third operating parameter includes: the operating current and operating voltage of each remote unit. The step of obtaining the first sub-line impedance and the second sub-line impedance of the photovoltaic energy storage system based on the first operating parameter, the second operating parameter, and the third operating parameter includes: Based on the operating current of each remote unit at the current moment, calculate the first total operating current of the first remote unit set at the current moment; Based on the operating voltage of each remote unit at the current moment, calculate the average operating voltage of the first remote unit set at the current moment; The impedance of the first sub-line is calculated based on the first output voltage, the average operating voltage, and the first current parameter. The impedance of the second sub-line is calculated based on the second output voltage, the average operating voltage, the first total operating current, and the first current parameter.

4. A control method for a photovoltaic energy storage system, characterized in that, Applied to a cloud controller, the method includes: Obtain the first operating parameters of the central office unit for the current time, the second operating parameters of the optical storage controller for the current time, and the third operating parameters of each remote unit for the current time; Based on the first operating parameters, the second operating parameters, and the third operating parameters, the first line impedance coefficient of the photovoltaic energy storage system is calculated. The first line impedance coefficient is used to characterize the ratio of the line impedance between the central office and the first remote unit set in the first remote unit system to the line impedance between the central office and the photovoltaic energy storage power supply system. The first remote unit set includes at least one remote unit between the central office and the feedforward sampling point. Based on the first line impedance coefficient, the second system compensation current of the photovoltaic-storage system at the next moment is determined, and the second system compensation current is sent to the photovoltaic-storage controller in the photovoltaic-storage power supply system, so that the photovoltaic-storage controller determines the compensation command based on the second system compensation current, and sends the compensation command to the first inverter module DC-DC in the photovoltaic-storage power supply system. The photovoltaic-storage system includes the photovoltaic-storage power supply system. When the first inverter module DC-DC outputs the second system compensation voltage after receiving the compensation command, the second system operating efficiency of the photovoltaic-storage system at the next moment meets the preset compensation requirements. The photovoltaic-storage system includes the photovoltaic-storage power supply system. The step of calculating the first line impedance coefficient of the photovoltaic-storage system based on the first operating parameter, the second operating parameter, and the third operating parameter includes: Based on the first operating parameters, the second operating parameters, and the third operating parameters, the first sub-line impedance and the second sub-line impedance of the photovoltaic energy storage system are obtained respectively, wherein the first sub-line impedance is the equivalent line impedance between the central office unit and the first remote unit set, and the second sub-line impedance is the equivalent line impedance between the first remote unit set and the photovoltaic energy storage power supply system. Calculate the first line impedance coefficient of the photovoltaic energy storage system based on the first sub-line impedance and the second sub-line impedance. The first operating parameter includes: a first output voltage and a first current parameter; the second operating parameter includes: a second output voltage; and the third operating parameter includes: the operating current and operating voltage of each remote unit. The step of obtaining the first sub-line impedance and the second sub-line impedance of the photovoltaic energy storage system based on the first operating parameter, the second operating parameter, and the third operating parameter includes: Based on the operating current of each remote unit at the current moment, calculate the first total operating current of the first remote unit set at the current moment; Based on the operating voltage of each remote unit at the current moment, calculate the average operating voltage of the first remote unit set at the current moment; The impedance of the first sub-line is calculated based on the first output voltage, the average operating voltage, and the first current parameter. The impedance of the second sub-line is calculated based on the second output voltage, the average operating voltage, the first total operating current, and the first current parameter.

5. A photovoltaic energy storage system, characterized in that, include: Central office equipment, remote office equipment systems, and photovoltaic power supply systems; The remote unit system includes multiple remote units. The input terminal of the central office unit is electrically connected to an AC voltage network. The output terminal of the central office unit is electrically connected to each of the remote units respectively. The optical energy storage power supply system is connected in parallel with each of the remote units through feedforward sampling points between the multiple remote units. The photovoltaic-storage power supply system includes: a photovoltaic panel module, a photovoltaic-storage controller, a maximum power point tracking control solar controller (MPPT), an energy storage battery, and a first inverter module (DCCDC). The power output terminal of the photovoltaic panel module is electrically connected to the input terminal of the MPPT, the output terminal of the MPPT is electrically connected to the input terminal of the energy storage battery, the output terminal of the energy storage battery is electrically connected to the output terminal of the first inverter module (DCCDC), and the control terminal of the first inverter module (DCCDC) is electrically connected to the first control terminal of the photovoltaic-storage controller. The photovoltaic-storage controller is used to execute the steps of claim 3.

6. The photovoltaic energy storage system according to claim 5, characterized in that, The remote units include N units, of which NM remote units are powered by the optical-storage power supply system, and M remote units are powered by the central office unit, or by the central office unit and the optical-storage power supply system. N and M are integers greater than 1, and the difference between N and M is greater than 1.

7. The photovoltaic energy storage system according to claim 5, characterized in that, The central office unit includes a second inverter module (ACDC) and a first controller. Each remote unit includes a third inverter module (DCAC), a second controller, and a terminal load, wherein the terminal load is a drive-test terminal.

8. An electronic device, characterized in that, include: The device includes a processor, a storage medium, and a bus. The storage medium stores machine-readable instructions executable by the processor. When the electronic device is running, the processor communicates with the storage medium via the bus, and the processor executes the machine-readable instructions to perform the steps of the control method for the optical storage system as described in any one of claims 1-4.

Images