Energy storage system, and control method and control circuit of energy storage system

Abstract

The invention provides an energy storage system and a control method and a control circuit of the energy storage system, the energy storage system comprises the control circuit, an inverter circuit and an energy storage circuit, the control circuit is connected with the inverter circuit and the energy storage circuit, the control circuit is also connected with at least one photovoltaic module, and the photovoltaic module is connected with the inverter circuit and the energy storage circuit. The control circuit can determine the target power distribution mode from the supported at least two power distribution modes, and can distribute the output power of the at least one photovoltaic module more flexibly and effectively according to the target power distribution mode, thereby enriching the functions provided by the energy storage system, and improving the energy storage efficiency. And the use requirements of the energy storage system in different scenes are ensured, so that the user experience of the energy storage system is improved.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to an energy storage system, a control method for the energy storage system, and a control circuit. Background Art

[0002] The micro plug-in photovoltaic battery energy storage system is a small energy storage system that can be used in home scenarios. One end of the energy storage system is connected to the photovoltaic module and the other end is connected to the power grid. There is also a battery inside. The output power provided by the photovoltaic module can provide charging power to the battery and provide input power to the power grid. Later, when the photovoltaic module stops providing output power, the output power provided by the battery can still provide input power to the power grid, ensuring the continuous and stable operation of the power grid.

[0003] However, the existing energy storage systems can only provide a few functions, which affects the use of energy storage systems in different scenarios. Summary of the invention

[0004] The present application provides an energy storage system, a control method and a control circuit for the energy storage system, which are used to solve the technical problem that the energy storage system in the prior art has relatively single functions, so as to meet the use requirements of the energy storage system in different scenarios.

[0005] In a first aspect, the present application provides an energy storage system, comprising: a control circuit, an inverter circuit and an energy storage circuit, wherein the control circuit is connected to the inverter circuit and the energy storage circuit respectively, the control circuit is also connected to at least one photovoltaic component, and the inverter circuit is also connected to a power grid, the control circuit supports at least two power distribution modes, and the control circuit is configured to: determine a target power distribution mode from the at least two power distribution modes; and distribute the output power of the at least one photovoltaic component to the power grid and / or the energy storage circuit according to the target power distribution mode.

[0006] A second aspect of the present application provides a control circuit of an energy storage system, wherein the control circuit is respectively connected to an inverter circuit and an energy storage circuit of the energy storage system, and the control circuit is also connected to at least one photovoltaic component. The control circuit supports at least two power distribution modes, and the control circuit is configured to: determine a target power distribution mode from the at least two power distribution modes; and distribute the output power of the at least one photovoltaic component to the power grid and / or the energy storage circuit according to the target power distribution mode.

[0007] A third aspect of the present application provides a control method for an energy storage system, which is applied to a control circuit, wherein the control circuit is respectively connected to an inverter circuit and an energy storage circuit of the energy storage system, and the control circuit is also connected to at least one photovoltaic component. The control circuit supports at least two power distribution modes, and the control method includes: determining a target power distribution mode from at least two power distribution modes; and distributing the output power of the at least one photovoltaic component to the power grid and / or the energy storage circuit according to the target power distribution mode.

[0008] The fourth aspect of the present application provides an electronic device, comprising: a memory and a processor; the memory stores computer-executable instructions; the processor executes the computer-executable instructions stored in the memory, so that the processor executes the method described in the third aspect of the present application.

[0009] A fifth aspect of the present application provides a computer-readable storage medium storing computer-executable instructions, which, when executed, implement the method described in the third aspect of the present application.

[0010] In a sixth aspect, the present application provides a computer program product, including a computer program, which, when executed, implements the method described in the third aspect of the present application.

[0011] In summary, in the energy storage system, control method of the energy storage system and control circuit provided by the present application, the control circuit can determine the target power distribution mode from at least two supported power distribution modes, and allocate the output power of at least one photovoltaic component more flexibly and effectively according to the target power distribution mode, thereby enriching the functions that the energy storage system can provide and ensuring the use requirements of the energy storage system in different scenarios, thereby improving the user experience of the energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0013] Figure 1 A schematic diagram of the application scenario of this application;

[0014] Figure 2 A schematic diagram of the structure of an energy storage system;

[0015] Figure 3 A schematic diagram of a flow chart of an embodiment of a control method for an energy storage system provided in the present application;

[0016] Figure 4 A schematic diagram of the first working mode of the energy storage system provided in this application;

[0017] Figure 5 A schematic diagram of the second working mode of the energy storage system provided in this application;

[0018] Figure 6 A schematic diagram of the third working mode of the energy storage system provided in this application;

[0019] Figure 7 A schematic diagram of the fourth working mode of the energy storage system provided in this application;

[0020] Figure 8 A schematic diagram of the fifth working mode of the energy storage system provided in this application;

[0021] Fig. 9 A schematic diagram of the sixth working mode of the energy storage system provided in this application;

[0022] Fig.10 A schematic diagram of the structure of the control circuit of the energy storage system provided in this application;

[0023] Fig.11 A schematic diagram of the circuit structure of an embodiment of a control circuit of an energy storage system provided in the present application;

[0024] Fig.12 A schematic diagram of a display interface of a working mode of an energy storage system provided in this application;

[0025] Fig.13 A schematic diagram of a display interface for power parameter settings provided in this application;

[0026] Fig.14 A schematic diagram of the structure of an electronic device provided in this application. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0028] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0029] Figure 1 This is a schematic diagram of the application scenario of this application, such as Figure 1 A schematic diagram of an energy storage system 1 used in a home is shown, wherein the energy storage system 1 is connected to at least one photovoltaic module 2, which can be used to obtain solar energy through sunlight and convert the solar energy into electrical energy. Figure 1 In the example shown, an energy storage system 1 is connected to two photovoltaic modules 2 as an example, which are denoted as photovoltaic module 2-1 and photovoltaic module 2-2. The energy storage system 1 is also connected to the home grid 3 and is used to supply power to the grid 3 based on the energy provided by at least one photovoltaic module 2. After the load 4 in the home application scenario is connected to the grid 3, the energy provided by the energy storage system 3 drives the load 4 through the grid 3.

[0030] In one embodiment, if Figure 1 The energy storage system 1 in the household scenario shown can also be called a micro plug-in photovoltaic battery energy storage system, or a balcony photovoltaic energy storage system based on its characteristic of being usually installed on a balcony.

[0031] Figure 2 A schematic diagram of the structure of an energy storage system is shown in FIG. Figure 2 The energy storage system 1 shown can be used in Figure 1 Specifically, Figure 2 The energy storage system 1 shown includes: a control circuit 11, an inverter circuit 12 and an energy storage circuit 13. Among them, the control circuit 11 is connected to the inverter circuit 12 and the energy storage circuit 13 respectively. The control circuit 11 is also connected to at least one photovoltaic module 2, and the inverter circuit 12 is also connected to the power grid 3. In one embodiment, the power grid 3 can be a single-phase power grid of AC220V / 230V. The energy storage circuit 13 can be a battery pack composed of 12 lithium iron phosphate cells connected in series.

[0032] Specifically, the control circuit 11 can be used to control the output power provided by at least one photovoltaic module 2 to provide input power to the power grid 3 after being processed by the inverter circuit 12, thereby supplying power to the power grid 3. The control circuit 11 can also be used to control the output power provided by at least one photovoltaic module 2 to provide charging power to the energy storage circuit 13, thereby charging the energy storage circuit 13. The control circuit 13 can also control the output power provided by the energy storage circuit 13 to provide input power to the power grid 3 after being processed by the inverter circuit 12, so that when the photovoltaic module 2 does not provide output power, it can still supply power to the power grid 3 to ensure the continuous and stable operation of the power grid 3. Since the control circuit 11 can be used to optimize the electric energy provided by the photovoltaic module 2 and store it in the battery to obtain output to supply power to the power grid 3 in the home, in some technologies, the control circuit 11 can also be called an energy optimizer.

[0033] like Figure 2 In the energy storage system 1 shown, although the control circuit 11 can distribute the output power of at least one photovoltaic component 2, the control circuit 11 cannot clearly specify under what power distribution mode and under what conditions the output power of at least one photovoltaic component 2 is distributed, resulting in the energy storage system 1 being able to provide relatively single functions, thereby affecting the use requirements of the energy storage system 1 in different scenarios and affecting the user experience of the energy storage system 1.

[0034] Based on this, the present application provides an energy storage system, a control method for the energy storage system, and a control circuit, so that the control circuit 11 can distribute the output power of at least one photovoltaic component 2 according to different power distribution modes, thereby enriching the function of the energy storage system 1. The technical solution of the present application is described in detail with specific embodiments below. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

[0035] Figure 3 A flow chart of an embodiment of a control method for an energy storage system provided in the present application is shown in FIG. Figure 3 The control method shown can be applied to Figure 2 In the energy storage system 1 shown in FIG. 1 , the control circuit 11 performs the operation. Specifically, Figure 3 The control method of the energy storage system 1 shown includes:

[0036] S101: The control circuit 11 determines a target power allocation mode from at least two power allocation modes supported by it.

[0037] Specifically, the control circuit 11 of the energy storage system 1 provided in the present application supports at least two power allocation modes. Therefore, before controlling the output power of at least one photovoltaic component 2, the control circuit 11 first determines the current target power allocation mode.

[0038] In one embodiment, the target power allocation mode may be preset, or may be determined by the control circuit 11 according to the current working state of the energy storage system 1. Alternatively, the control circuit 11 may also receive the target power allocation mode sent by a user of the energy storage system 1.

[0039] S102: the control circuit 11 distributes the output power provided by at least one photovoltaic assembly 2 according to the target power distribution mode determined in S101.

[0040] Specifically, the control circuit 1 can distribute the output power of at least one photovoltaic component 2 to the power grid 3, or distribute the output power of at least one photovoltaic component 2 to the energy storage circuit 13, or distribute the output power of at least one photovoltaic component 2 to the power grid 3 and the energy storage circuit 13 according to the target power distribution mode.

[0041] In one embodiment, the control of the at least one photovoltaic assembly 2 and the energy storage circuit 13 by the control circuit 11 includes: allocating the output power of the at least one photovoltaic assembly 2 to the energy storage circuit 13 first, thereby providing charging power to the energy storage circuit 13 to charge the energy storage circuit 13, and then allocating the output power of the at least one photovoltaic assembly 2 to the power grid 3 to provide input power to the power grid 3. Alternatively, the output power of the at least one photovoltaic assembly 2 is allocated to the power grid 3 first, and the power grid 3 is provided with input power.

[0042] In summary, the control method of the energy storage system 1 provided in this embodiment, since the control circuit 11 can support at least two different power allocation modes, the control circuit 11 can more flexibly perform more effective control and power scheduling of at least one photovoltaic component 2 and the energy storage circuit 13 according to the currently determined target power allocation mode. It can be understood that the power allocation mode can also be increased and adjusted, thereby enriching the functions that the energy storage system 1 can provide, so as to maximize the use of new energy power generation energy, and ensure the use requirements of the energy storage system 1 in different scenarios, thereby improving the user experience of the energy storage system 1.

[0043] In a specific implementation, the embodiment of the present application provides two power allocation modes, which are recorded as the first power allocation mode and the second power allocation mode, wherein the first power allocation mode refers to a power allocation mode in which the output power of at least one photovoltaic component 2 is preferentially allocated to the energy storage circuit 13, and the second power allocation mode refers to a power allocation mode in which the output power of at least one photovoltaic component 2 is preferentially allocated to the power grid 3. The two power allocation modes are described below.

[0044] The first power allocation mode includes:

[0045] When the remaining power (State Of Charge, SOC) of the energy storage circuit 13 is less than the first power threshold, the control circuit 11 distributes the output power of at least one photovoltaic component 2 to the energy storage circuit 13, providing charging power to the energy storage circuit 13 to charge the energy storage circuit 13.

[0046] When the remaining power of the energy storage circuit 13 is greater than the first power threshold, the control circuit 11 distributes the output power of at least one photovoltaic component 2 to the grid 3 to provide input power to the grid 3 .

[0047] In particular, when the remaining power of the energy storage circuit 13 is equal to the first power threshold, the control circuit 11 can allocate the output power of at least one photovoltaic component 2 to the energy storage circuit 13, and can also allocate the output power of at least one photovoltaic component 2 to the power grid 3, depending on the setting of the energy storage system 1.

[0048] In one embodiment, the first power threshold may be set to 100%, or a constant that is less than 100% and close to 100%.

[0049] In the first power allocation mode provided in this embodiment, the control circuit 11 preferentially allocates the output power provided by at least one photovoltaic component 2 to the energy storage circuit 13, so that the energy storage circuit 13 is charged and its remaining power gradually increases. Subsequently, when the remaining power of the energy storage circuit 13 is greater than the first power threshold, the output power provided by at least one photovoltaic component 2 will be allocated to the power grid 3. In the first power allocation mode, the output power provided by at least one photovoltaic component 2 can be better stored, and the remaining power of the energy storage circuit 13 is always maintained at a high value, which improves the utilization rate of the energy storage circuit 13 and enables users of the energy storage system 1 to call on demand according to the electric energy stored in the energy storage circuit 13. For example, during the peak period of the mains electricity, more energy stored in the energy storage circuit 13 is used to supply power to the power grid 3, and during the trough period of the mains electricity, less energy stored in the energy storage circuit 13 is used to supply power to the power grid 3.

[0050] The second power distribution mode includes:

[0051] When the output power of at least one photovoltaic component 2 is greater than the first power threshold, the control circuit 11 divides the output power of at least one photovoltaic component 2 into two parts, wherein the first part is used to be allocated to the energy storage circuit 13 to provide charging power to charge the energy storage circuit 13, and the second part is used to be allocated to the power grid 3 to provide input power to the power grid 3.

[0052] When the output power of at least one photovoltaic component 2 is less than or equal to the first power threshold, it means that the output power provided by at least one photovoltaic component 2 cannot even provide input power for the power grid 3 alone, let alone divide it into two parts. Therefore, when the remaining power of the energy storage circuit 13 is greater than or equal to the second power threshold, the control circuit 11 controls the output power of at least one photovoltaic component 2 and the output power of the energy storage circuit 13 to jointly provide input power to the power grid 3, that is, the control circuit 11 allocates both the output power of at least one photovoltaic component 2 and the output power of the energy storage circuit 13 to the power grid 3.

[0053] When the output power of at least one photovoltaic component 2 is less than or equal to the first power threshold, and the remaining power of the energy storage circuit 13 is less than the second power threshold, the control circuit 11 distributes the output power of at least one photovoltaic component 2 to the energy storage circuit 13, and provides charging power to charge the energy storage circuit 13.

[0054] In summary, in the second power allocation mode provided in this embodiment, the control circuit 11 allocates the output power provided by at least one photovoltaic component 2 to the power grid 3 in priority, which can better ensure the power supply demand in the home application scenario. Only when the remaining power of the energy storage circuit 13 is lower than the second power threshold, the output power provided by at least one photovoltaic component 2 is allocated to the energy storage circuit 1 for charging, which can avoid permanent damage caused by long-term over-discharge of the energy storage circuit 13 in rainy days and other environments. While ensuring the power demand of users of the energy storage system 1, the service life of the energy storage circuit 13 and the energy storage system 1 in which it is located is also extended. The present application provides a combination of the first power allocation mode and the second allocation mode, and the energy storage system 1 can flexibly switch between different power allocation modes to achieve diversified energy distribution, so as to maximize the use of the new energy energy of the photovoltaic component 2 and maximize the role and value of the energy storage system 1.

[0055] Further, in the above embodiment, when the target power allocation mode is the second power allocation mode, the control circuit 11 also determines that the first power threshold is a preset value. For example, the preset value is 200W. The preset value can also be adjusted by the energy storage system 1 according to current environmental factors, etc. In this embodiment, the control circuit 11 can be controlled according to the first power threshold predetermined in advance, reducing the setting requirements of the energy storage system 1 and improving the automation of the energy storage system.

[0056] In another embodiment, when the target power allocation mode is the second power allocation mode, the control circuit 11 also determines a plurality of first power thresholds, and the plurality of first power thresholds correspond to a plurality of time periods. For example, the first power threshold between 8:00 and 10:00 in each time period of the day is 400W, the first power threshold between 12:00 and 14:00 is 500W, and the first power threshold between 18:00 and 20:00 is 600W. The first power threshold in other time periods may be a preset value of 200W. In this embodiment, the control circuit 11 may set the first power threshold of the second power allocation mode more flexibly, further improving the granularity and accuracy of power allocation, and more effectively realizing power allocation in each time period, further enriching the use scenarios and requirements of the energy storage system 1, thereby improving the use experience of the energy storage system 1.

[0057] In one embodiment of the present application, the control circuit 11 can also distribute the output power of the energy storage circuit 13 according to the working state of the photovoltaic assembly 2 on the basis of the first power distribution mode and the second power distribution mode. These distributions can be performed in both the first power distribution mode and the second power distribution mode.

[0058] Among them, when the input power of at least one photovoltaic assembly 2 is less than or equal to the second power threshold, and the remaining power of the energy storage circuit 13 is greater than the third power threshold, the control circuit 11 distributes the output power of the energy storage circuit to the power grid 3. In one embodiment, the second power threshold can be set to 0, or a constant greater than 0 and close to 0, and the third power threshold can be set to 20%. This embodiment can be applied when the output power of at least one photovoltaic assembly 2 is low, and it is impossible to provide input power to the power grid 3 or charging power to the energy storage circuit 13. Therefore, the control circuit 11 distributes the output power of the energy storage circuit 13 to the power grid 3, ensuring that the power grid 3 can continuously provide energy to the load 4, and ensuring the continuous and stable operation of the load 4.

[0059] When the input power of at least one photovoltaic component 2 is less than or equal to the second power threshold, and the remaining power of the energy storage circuit 13 is less than or equal to the third power threshold, the control circuit 11 stops distributing the output power of the energy storage circuit 13 to prevent the energy storage circuit 13 from being damaged due to over-discharge.

[0060] In conjunction with the accompanying drawings, the following introduces six operating modes that can be implemented by the energy storage system 1 provided in the present application based on the first power allocation mode and the second allocation mode.

[0061] Figure 4This is a schematic diagram of the first working mode of the energy storage system provided in the present application. The first working mode can be applied to the second power allocation mode. When the output power of at least one photovoltaic component 2 is greater than the first power threshold and the remaining power of the energy storage circuit 13 is not 100% fully charged, the control circuit 11 allocates a first part of the output power provided by at least one photovoltaic component 2 to the energy storage circuit 13 and a second part to the power grid 3.

[0062] Figure 5 The schematic diagram of the second working mode of the energy storage system provided in the present application, the second working mode can be applied to the first power distribution mode, when the output power of at least one photovoltaic component 2 is greater than the second power threshold, and the remaining power of the energy storage circuit 13 is greater than or equal to the first power threshold, the control circuit 11 distributes the output power of at least one photovoltaic component 2 to the power grid 3. The second working mode can also be applied to the second power distribution mode, when the output power of at least one photovoltaic component 2 is greater than the first power threshold, and the remaining power of the energy storage circuit 13 is greater than or equal to the first power threshold, or, when the output power of at least one photovoltaic component 2 is equal to the first power value, and the remaining power of the energy storage circuit 13 is greater than or equal to the second power threshold, or, when the output power of at least one photovoltaic component 2 is less than or equal to the first power value, and the remaining power of the energy storage circuit 13 is equal to the second power threshold, the control circuit 11 distributes the output power of at least one photovoltaic component 2 to the power grid 3.

[0063] Figure 6 This is a schematic diagram of the third operating mode of the energy storage system provided in the present application. The third operating mode can be applied to the second power distribution mode. When the output power of at least one photovoltaic component 2 is less than the first power threshold and the remaining power of the energy storage circuit is greater than the second power threshold, the control circuit distributes the output power of at least one photovoltaic component 2 and the output power of the energy storage circuit 13 to the power grid 3.

[0064] Figure 7 This is a schematic diagram of the fourth working mode of the energy storage system provided in the present application. The fourth working mode can be applied to the first power allocation mode. When the output power of at least one photovoltaic component 2 is greater than the second power threshold and the remaining power of the energy storage circuit 13 is less than the first power threshold, the control circuit 11 allocates the output power of at least one photovoltaic component 2 to the energy storage circuit 13. The fourth working mode can also be applied to the second power allocation mode. When the output power of at least one photovoltaic component 2 is greater than the second power threshold and the remaining power of the energy storage circuit 13 is less than the second power threshold, the control circuit 11 allocates the output power of at least one photovoltaic component 2 to the energy storage circuit 13.

[0065] Figure 8This is a schematic diagram of the fifth working mode of the energy storage system provided in the present application, and the fifth working mode can be applied to the first power allocation mode and the second power allocation mode. When the output power of at least one photovoltaic component 2 is less than or equal to the second power threshold, and the remaining power of the energy storage circuit 13 is greater than the third power threshold, the control circuit 11 allocates the output power of the energy storage circuit 13 to the power grid 3.

[0066] Fig. 9 This is a schematic diagram of the sixth working mode of the energy storage system provided in the present application, and the sixth working mode can be applied to the first power allocation mode and the second power allocation mode. When the output power of at least one photovoltaic component 2 is less than or equal to the second power threshold, and the remaining power of the energy storage circuit 13 is less than or equal to the third power threshold, the control circuit 11 stops allocating the output power of at least one photovoltaic component 2 and also stops allocating the output power of the energy storage circuit 13.

[0067] Fig.10 The schematic diagram of the control circuit of the energy storage system provided in this application is as follows: Fig.10 FIG. 1 shows a specific implementation of the control circuit 11. Fig.10 The control circuit 11 shown includes: a first controller 111 , a second controller 112 and at least one voltage conversion circuit 113 .

[0068] In one embodiment, the first controller 111 may be a (Digital Signal Processing, referred to as: DSP) chip. The second controller 112 may be a microcontroller unit (Microcontroller Unit, referred to as: MCU), specifically, a (Battery Management System, referred to as: BMS). The voltage conversion circuit 113 may specifically be a DC / DC conversion circuit. The inverter circuit 12 may specifically be a DC / AC conversion circuit.

[0069] At least one voltage conversion circuit 113 corresponds to at least one photovoltaic module 2, and the first end of each voltage conversion circuit 113 is connected to the corresponding photovoltaic module. Fig.10 In the illustrated embodiment, the voltage conversion circuit 113-1 corresponds to the photovoltaic module 2-1, and the voltage conversion circuit 113-2 corresponds to the photovoltaic module 2-2. The second end of each voltage conversion circuit 113 is respectively connected to the first end of the inverter circuit 12 and the energy storage circuit 13, and the second end of the inverter circuit 12 is also connected to the power grid 3.

[0070] The first controller 111 may be used to control at least one voltage conversion circuit 113 . The first controller 111 may also control the inverter circuit 12 and the energy storage circuit 13 through the second controller.

[0071] For example, when the output power of at least one photovoltaic assembly 2 is allocated to the energy storage circuit 13, the first controller 111 controls the voltage conversion circuit 113 to perform voltage conversion processing on the output voltage provided by the photovoltaic assembly 2. When the output power of at least one photovoltaic assembly 2 is allocated to the power grid 3, the first controller 111 controls the voltage conversion circuit 113 to perform voltage conversion processing on the output voltage provided by the photovoltaic assembly 2, and the first controller 111 controls the inverter circuit 12 through the second controller 112 to convert the output voltage of the voltage conversion circuit 113 after the voltage conversion processing into alternating current and provide it to the power grid 3. When the output power of the energy storage circuit 13 is allocated to the power grid 3, the first controller 111 controls the inverter circuit 12 through the second controller 112 to convert the output voltage of the energy storage circuit 13 into alternating current and provide it to the power grid 3.

[0072] In one embodiment, the second controller 112 communicates with the inverter circuit 12 via RS485, which can make the communication between the second controller 112 and the inverter circuit 112 more efficient and reliable.

[0073] Fig.11 A schematic diagram of the circuit structure of an embodiment of a control circuit of an energy storage system provided in the present application is shown in FIG. Fig.11 Shows Fig.10 A specific circuit implementation of the control circuit shown in FIG. Fig.11 As shown, each voltage conversion circuit includes 4 switch structures and 2 drive circuits. For example, the voltage conversion circuit 113-1 includes switch structures Q1-Q4, the switch structures Q1 and Q2 share one drive circuit, the switch structures Q3 and Q4 share one drive circuit, and the voltage conversion circuit 113-2 includes switch structures Q5-Q8, the switch structures Q5 and Q6 share one drive circuit, and the switch structures Q7 and Q8 share one drive circuit. At the same time, the first controller 111 also provides an interface for detecting the input voltage PV1 and current I1 of the voltage conversion circuit 113-1, and the input voltage PV2 and current I2 of the voltage conversion circuit 113-2. Then the first controller 111 can adjust the switching frequency according to the collected voltage, thereby adjusting the output power of the voltage conversion circuit 113, so that the output power of the voltage conversion circuit 113 is the maximum power point (MPPT).

[0074] Specifically, taking the voltage conversion circuit 113-1 as an example, the first controller 111 can collect the voltage PV1 of the voltage conversion circuit 113-1, and then determine the switching frequency of the switch structure Q1-Q4 in the voltage conversion circuit 113 according to the voltage PV1, so that the output power of the photovoltaic component 2 connected to the voltage conversion circuit 113-1 reaches the maximum power point. Finally, the first controller 111 controls the switch structure Q1-Q4 in the voltage conversion circuit 113-1 to turn on and off according to the switching frequency according to the determined switching frequency, so that the voltage conversion circuit 113-1 performs voltage conversion processing on the output voltage of the photovoltaic component 2-1. Similarly, the first controller 111 can also adjust the switching frequency according to the voltage PV2 of the voltage conversion circuit 113-2, so that the output power of the photovoltaic component 2-2 reaches the maximum power point.

[0075] Among them, the first controller 111 can specifically send a switching frequency driving signal PQ1 to the driving circuit of the switch structure Q1, send a switching frequency driving signal PQ2 to the driving circuit of the switch structure Q2, send a switching frequency driving signal PQ3 to the driving circuit of the switch structure Q3, send a switching frequency driving signal PQ4 to the driving circuit of the switch structure Q4, and so on. The first controller 111 can realize control of each switch structure Q1-Q10.

[0076] In summary, in the energy storage system provided by this embodiment, the first controller 111 can collect parameters such as voltage and current of the voltage conversion circuit 113, so there is no need to install special equipment such as electric energy meters in the energy storage system to monitor the power grid, and the MPPT function of the output power of at least one photovoltaic component 2 can be realized through the first controller 111. While ensuring the basic functions of the energy storage system 1, the circuit complexity of the energy storage system 1 is reduced, thereby reducing the design and production costs of the energy storage system 1.

[0077] The electricity threshold and power threshold provided in the embodiments of the present application can be provided to the user of the energy storage system 1 through the display interface, and can be set by the user through the display interface, thereby increasing the interaction between the energy storage system 1 and the user, further enriching the functions of the energy storage system 1, and improving the user experience.

[0078] For example, Fig.12 This is a schematic diagram of a display interface of a working mode of an energy storage system provided in this application. The energy storage system 1 can provide the following Fig.12 The display interface shown in FIG. 1 shows the user the current working mode. For example, in Fig.12 In the example shown, the output power provided by the photovoltaic component 2 - 1 is 105 W, the output power provided by the photovoltaic component 2 - 2 is 118 W, and the power distributed by the control circuit 11 to the grid 3 is 132 W.

[0079] For example, Fig.13 This is a schematic diagram of a display interface for power parameter settings provided in this application. The energy storage system 1 can provide Fig.13 The display interface shown in the figure allows the user to set the first power threshold for different time periods, thereby obtaining the power value corresponding to each time period in the multiple time periods specified by the user. Fig.13 In the example shown, the first power threshold for the time period 14:20-18:45 is 42 W, the first power threshold for the time period 19:20-23:45 is 85 W, and so on.

[0080] In the above-mentioned embodiments of the present application, the control method for controlling the energy storage system provided by the embodiments of the present application is introduced. In order to realize the functions in the methods provided by the above-mentioned embodiments of the present application, the control circuit 11, the first controller 111 and the second controller 112 as the execution subject may include hardware structure and / or software module, and realize the above-mentioned functions in the form of hardware structure, software module, or hardware structure plus software module. Whether one of the above-mentioned functions is executed in the form of hardware structure, software module, or hardware structure plus software module depends on the specific application and design constraints of the technical solution.

[0081] It should be noted that it should be understood that the division of the various modules of the above device is only a division of logical functions. In actual implementation, they can be fully or partially integrated into one physical entity, or they can be physically separated. And these modules can all be implemented in the form of software called by processing elements; they can also be all implemented in the form of hardware; some modules can also be implemented in the form of software called by processing elements, and some modules can be implemented in the form of hardware. For example, the processing module can be a separately established processing element, or it can be integrated in a chip of the above device. In addition, it can also be stored in the memory of the above device in the form of program code, and called and executed by a processing element of the above device. The function of the above-mentioned module is determined. The implementation of other modules is similar. In addition, these modules can be fully or partially integrated together, or they can be implemented independently. The processing element described here can be an integrated circuit with signal processing capabilities. In the implementation process, each step of the above method or each module above can be completed by an integrated logic circuit of hardware in the processor element or instructions in the form of software.

[0082] For example, 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 (ASIC), or one or more microprocessors (digital signal processors, DSP), or one or more field programmable gate arrays (FPGA), etc. For another example, when a module above 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 processor that can call program code. For another example, these modules may be integrated together and implemented in the form of a system-on-a-chip (SOC).

[0083] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrated. The available medium may be a magnetic medium, (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid state disk (SSD)), etc.

[0084] For example, Fig.14 A schematic diagram of the structure of an electronic device provided in this application, such as Fig.14 The electronic device shown can be used to execute the control method and / or steps in the control method performed by the control circuit 11, the first controller 111 and the second controller 112 provided in any embodiment of the present application. Fig.14The electronic device 2000 shown includes a processor 2001 and a memory 2002; wherein the memory 2002 is used to store computer executable instructions, and the processor 2001 can execute the computer executable instructions stored in the memory 2002. When the computer executable instructions are executed by the processor 2001, the processor 2001 implements the method and / or steps thereof executed by any of the control circuits 11, the first controller 111 and the second controller 112 in the aforementioned embodiments of the present application. In one embodiment, Fig.14 The electronic device 2000 shown further includes a communication interface 2003 , wherein the processor 2001 can communicate with other devices via the communication interface 2003 .

[0085] The present application also provides a computer-readable storage medium, which stores computer-executable instructions. When the computer-executable instructions are executed, they can be used to implement any of the control methods and / or steps therein in the aforementioned embodiments of the present application.

[0086] An embodiment of the present application also provides a chip for executing instructions, wherein the chip is used to execute any of the control methods and / or steps thereof as described above in the present application.

[0087] An embodiment of the present application also provides a computer program product, including a computer program, which, when executed, implements any of the control methods and / or steps thereof as described above in the present application.

[0088] Those skilled in the art can understand that all or part of the steps of implementing the above-mentioned method embodiments can be completed by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, the steps of the above-mentioned method embodiments are executed; and the aforementioned storage medium includes: ROM, RAM, disk or optical disk and other media that can store program codes.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An energy storage system, characterized in that: include: A control circuit (11), an inverter circuit (12) and an energy storage circuit (13), wherein the control circuit (11) is connected to the inverter circuit (12) and the energy storage circuit (13) respectively, the control circuit (11) is also connected to at least one photovoltaic component (2), the inverter circuit (12) is also connected to a power grid (3), the control circuit (11) supports at least two power distribution modes, and the control circuit (11) is configured as follows: Determining a target power allocation mode from the at least two power allocation modes; The output power of the at least one photovoltaic component (2) is distributed to the power grid (3) and / or the energy storage circuit (13) according to the target power distribution mode.

2. The energy storage system according to claim 1, characterized in that: The power allocation mode includes a first power allocation mode: When the remaining power of the energy storage circuit (13) is less than a first power threshold, the output power of the at least one photovoltaic component (2) is allocated to the energy storage circuit (13); When the remaining power of the energy storage circuit (13) is greater than or equal to the first power threshold, the output power of the at least one photovoltaic component (2) is distributed to the power grid (3).

3. The energy storage system according to claim 1 or 2, characterized in that: The power allocation mode includes a second power allocation mode: When the output power of the at least one photovoltaic component (2) is greater than a first power threshold, a first portion of the output power of the at least one photovoltaic component (2) is allocated to the energy storage circuit (13), and a second portion is allocated to the power grid (3); When the output power of the at least one photovoltaic component (2) is less than or equal to the first power threshold, and the remaining power of the energy storage circuit (13) is less than a second power threshold, the output power of the at least one photovoltaic component (2) is allocated to the energy storage circuit (13); When the output power of the at least one photovoltaic component (2) is less than the first power threshold, and the remaining power of the energy storage circuit (13) is greater than or equal to a second power threshold, the output power of the at least one photovoltaic component (2) and the output power of the energy storage circuit (13) are distributed to the power grid (3).

4. The energy storage system according to claim 3, characterized in that: The control circuit (11) is further configured to: When the target power allocation mode is the second power allocation mode, the first power threshold is determined to be a preset value.

5. The energy storage system according to claim 3, characterized in that: The control circuit (11) is further configured to: When the target power allocation mode is the second power allocation mode, a first power threshold corresponding to each time period in a plurality of time periods is determined.

6. The energy storage system according to any one of claims 1 to 5, characterized in that: The control circuit (11) is further configured to: When the output power of the at least one photovoltaic component (2) is less than or equal to a second power threshold, and the remaining power of the energy storage circuit (13) is greater than a third power threshold, the output power of the energy storage circuit (13) is distributed to the power grid (3); When the output power provided by the at least one photovoltaic component (2) is less than or equal to the second power threshold, and the remaining power of the energy storage circuit (13) is less than or equal to the third power threshold, the output power of the energy storage circuit (13) is stopped from being distributed.

7. The energy storage system according to any one of claims 1 to 6, characterized in that: The control circuit (11) comprises: A first controller (111), a second controller (112) and at least one voltage conversion circuit (113), wherein a first end of the at least one voltage conversion circuit (113) is respectively connected to the at least one photovoltaic module (2), a second end of the at least one voltage conversion circuit (113) is respectively connected to a first end of the inverter circuit (12) and the energy storage circuit (13), and a second end of the inverter circuit (12) is connected to the power grid (3); The first controller (111) is used to control the at least one voltage conversion circuit (113) to perform voltage conversion processing on the output voltage of the at least one photovoltaic component (2); The first controller (111) is also used to control the inverter circuit (12) through the second controller (112) to convert the output voltage of the at least one photovoltaic component (2) after voltage conversion processing into alternating current, or to convert the output voltage of the energy storage circuit (13) into alternating current.

8. The energy storage system according to claim 7, characterized in that: The first controller (111) is further configured to: collecting the voltage of the voltage conversion circuit (113); Determining a switching frequency of the voltage conversion circuit (113) according to the voltage so that the output power of the photovoltaic component (2) connected to the voltage conversion circuit (113) reaches a maximum power point; The voltage conversion circuit (113) is controlled according to the switching frequency to perform voltage conversion processing on the output voltage of the photovoltaic component (2).

9. A control circuit of an energy storage system, characterized in that: The control circuit (11) is respectively connected to the inverter circuit (12) and the energy storage circuit (13) of the energy storage system, and the control circuit (11) is also connected to at least one photovoltaic module (2). The control circuit (11) supports at least two power distribution modes, and the control circuit (11) is configured as follows: Determining a target power allocation mode from the at least two power allocation modes; The output power of the at least one photovoltaic component (2) is distributed to the power grid (3) and / or the energy storage circuit (13) according to the target power distribution mode.

10. A control method for an energy storage system, characterized in that: Applied to a control circuit, the control circuit (11) is respectively connected to an inverter circuit (12) and an energy storage circuit (13) of the energy storage system, the control circuit (11) is also connected to at least one photovoltaic module (2), the control circuit (11) supports at least two power distribution modes, and the control method comprises: determining a target power allocation mode from at least two power allocation modes; The output power of the at least one photovoltaic component (2) is distributed to the power grid (3) and / or the energy storage circuit (13) according to the target power distribution mode.

11. An electronic device, characterized in that: include: Memory and processor; The memory stores computer executable instructions; The processor executes the computer executable instructions stored in the memory, so that the processor performs the method according to claim 10 .

12. A computer-readable storage medium, characterized in that: Computer executable instructions are stored, and when the computer executable instructions are executed, the method according to claim 10 is implemented.

13. A computer program product, characterized in that A computer program is included, which implements the method according to claim 10 when executed.

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