Power regulation method, device, equipment and storage medium

Abstract

The present application discloses an electric energy regulation method, device, electronic device and storage medium, the electric energy regulation method comprising: selectively obtaining the interface power information corresponding to the photovoltaic module interface, the load module interface and the grid module interface according to the current working mode of the electric energy management system; determining the target call power in the electric energy management system according to the interface power size and the interface power flow direction in the selectively obtained interface power information corresponding to each interface; determining the electric energy management system's to-be-compensated power or surplus power according to the target call power, and then calling the energy storage module interface to supply energy according to the to-be-compensated power or absorb energy according to the surplus power. Determining the control logic of the electric energy management system according to different working modes avoids the adverse effects of the integrated control logic and improves the scalability of the electric energy management system.

Description

Technical Field

[0001] The present application relates to the field of household energy storage technology, and more specifically, to an electric energy regulation method, device, electronic device and storage medium. Background Art

[0002] The global energy crisis is becoming increasingly severe, and the development of the home energy storage market is encouraged. After the battery cost drops, the economic benefits of home energy storage equipment are highlighted, and residents are more inclined to install energy storage systems. The energy management system in the energy storage system is the core of the entire home energy storage device. It controls the direction and size of energy flow of the device under different working conditions, so as to reasonably dispatch local energy to ensure the availability and economy of home energy storage equipment. However, in traditional energy management systems, the operating status of each device connected to the energy management system is combined with energy flow management to form an integrated control logic. The complexity of this control logic will become extremely complex as the number of devices connected to the energy management system and the energy regulation mode increase, which is not conducive to maintenance and management. Summary of the invention

[0003] In view of the above problems, the present application proposes a power regulation method, device, electronic device and storage medium.

[0004] In a first aspect, an embodiment of the present application provides an electric energy regulation method, which is applied to an electric energy management system, wherein the electric energy management system is used to manage the electric energy power between a photovoltaic module interface, an energy storage module interface, a load module interface and a power grid module interface, and the method comprises: according to the current working mode of the electric energy management system, selectively obtaining the interface power information corresponding to each of the photovoltaic module interface, the load module interface and the power grid module interface; the interface power information comprises the interface power size and the interface power flow direction; according to the interface power size and the interface power flow direction in the interface power information corresponding to each interface selectively obtained, determining the target call power in the electric energy management system; the target call power is the power that the electric energy management system requires the energy storage module interface to supply or absorb; according to the target call power, determining the electric energy power that the electric energy management system should supplement or the surplus electric energy power, and then calling the energy storage module interface to supply energy according to the electric energy power that should be supplemented or to absorb energy according to the surplus electric energy power.

[0005] In an optional embodiment, the method further includes: if the absolute value of the electric energy to be compensated exceeds the absolute value of the preset maximum discharge power of the energy storage module interface, the absolute value of the energy supply power of the energy storage module interface is configured to be the absolute value of the preset maximum discharge power; if the absolute value of the surplus electric energy exceeds the absolute value of the preset maximum charging power of the energy storage module interface, the absolute value of the energy absorption power of the energy storage module interface is configured to be the absolute value of the preset maximum charging power.

[0006] In an optional embodiment, the method further includes: if the energy storage module interface fails, configuring the maximum charging power and the maximum discharging power of the energy storage module interface to 0; if the energy storage capacity of the energy storage module interface exceeds a first preset value, configuring the maximum charging power of the energy storage module interface to 0; if the energy storage capacity of the energy storage module interface is lower than a second preset value, configuring the maximum discharging power of the energy storage module interface to 0.

[0007] In an optional embodiment, the working modes include: self-generation and self-use mode, peak shaving and valley filling mode, and energy storage priority mode.

[0008] In an optional embodiment, according to the current working mode of the electric energy management system, the interface power information corresponding to each of the photovoltaic module interface, the load module interface and the grid module interface is selectively obtained, including: in the self-generation and self-use mode, the current actual power of the photovoltaic module interface and the load module interface are respectively obtained; accordingly, according to the interface power size and interface power flow direction in the interface power information corresponding to each interface obtained selectively, the target call power in the electric energy management system is determined, including: according to the difference between the current actual power of the photovoltaic module interface and the current actual power of the load module interface, the target call power in the electric energy management system is determined.

[0009] In an optional embodiment, according to the current working mode of the electric energy management system, the interface power information corresponding to each of the photovoltaic module interface, the load module interface and the grid module interface is selectively obtained, including: in the peak shaving and valley filling mode, respectively obtaining the current actual power of the photovoltaic module interface, the current actual power of the load module interface and the current grid flow setting power of the grid module interface; accordingly, according to the interface power size and interface power flow direction in the interface power information corresponding to each interface obtained selectively, the target calling power in the electric energy management system is determined, including: according to the difference between the current actual power of the photovoltaic module interface, the current actual power of the load module interface and the current grid flow setting power of the grid module interface, the target calling power in the electric energy management system is determined.

[0010] In an optional embodiment, according to the current working mode of the electric energy management system, the interface power information corresponding to the photovoltaic module interface, the load module interface and the grid module interface is selectively obtained, including: in the energy storage priority mode, respectively obtaining the current actual power of the photovoltaic module interface and the current actual power of the load module interface; accordingly, according to the interface power size and interface power flow direction in the interface power information corresponding to each interface obtained selectively, the target call power in the electric energy management system is determined, including: according to the difference between the current actual power of the photovoltaic module interface and the current actual power of the load module interface, the target call power in the electric energy management system is determined.

[0011] In an optional embodiment, the method also includes: if the energy supply power of the photovoltaic module interface exceeds the sum of the tolerable powers of the energy storage module interface, the load module interface and the grid module interface in the current working mode of the power management system, then the energy supply power of the photovoltaic module interface is limited to the sum of the tolerable powers; and when the sum of the tolerable powers exceeds the maximum energy supply power of the photovoltaic module interface, the energy supply power of the photovoltaic module interface is limited to the maximum energy supply power.

[0012] In an optional embodiment, if the energy supply power of the photovoltaic module interface exceeds the sum of the tolerable powers of the energy storage module interface, the load module interface and the grid module interface in the current working mode of the electric energy management system, the energy supply power of the photovoltaic module interface is limited to the sum of the tolerable powers, including: in the self-generation and self-use mode, if the energy supply power of the photovoltaic module interface exceeds the sum of the maximum charging power of the energy storage module interface, the current actual power of the load module interface and the maximum power released to the grid module interface, the energy supply power of the photovoltaic module interface is limited to the sum of the three.

[0013] In an optional embodiment, if the energy supply power of the photovoltaic module interface exceeds the sum of the tolerable powers of the energy storage module interface, the load module interface and the grid module interface in the current working mode of the electric energy management system, the energy supply power of the photovoltaic module interface is limited to the sum of the tolerable powers, including: in the peak shaving and valley filling mode, if the energy supply power of the photovoltaic module interface exceeds the sum of the maximum charging power of the energy storage module interface, the current actual power of the load module interface and the current grid flow setting power of the grid module interface, the energy supply power of the photovoltaic module interface is limited to the sum of the three.

[0014] In an optional embodiment, if the energy supply power of the photovoltaic module interface exceeds the sum of the tolerable powers of the energy storage module interface, the load module interface and the grid module interface in the current working mode of the electric energy management system, the energy supply power of the photovoltaic module interface is limited to the sum of the tolerable powers, including: in the energy storage priority mode, if the energy supply power of the photovoltaic module interface exceeds the sum of the maximum charging power of the energy storage module interface, the current actual power of the load module interface and the maximum power released to the grid module interface, the energy supply power of the photovoltaic module interface is limited to the sum of the three.

[0015] In an optional embodiment, the method further includes: in the self-generation and self-use mode or the energy storage priority mode, if the grid backflow prevention function of the power management system is configured to be on, the maximum power released to the grid of the grid module interface is configured to be 0.

[0016] In an optional embodiment, the method further includes: determining the operating state of the power management system according to the current operating mode of the power management system and the target call power.

[0017] In a second aspect, an embodiment of the present application provides an electric energy regulation device, which includes: an interface power information acquisition module, which is used to selectively acquire the interface power information corresponding to the photovoltaic module interface, the load module interface and the grid module interface according to the current working mode of the electric energy management system; the interface power information includes the interface power size and the interface power flow direction; a target call power determination module, which is used to determine the target call power in the electric energy management system according to the interface power size and the interface power flow direction in the interface power information corresponding to each interface selectively acquired; the target call power is the power that the electric energy management system requires the energy storage module interface to supply or absorb; an adjustment module, which is used to determine the electric energy management system to supplement the power or the surplus electric energy according to the target call power, and then call the energy storage module interface to supply energy according to the electric energy to be supplemented or to absorb energy according to the surplus electric energy.

[0018] In a third aspect, an embodiment of the present application provides an electronic device, comprising: one or more processors; a memory; one or more applications, wherein the one or more applications are stored in the memory and configured to be executed by the one or more processors, and the one or more programs are configured to execute the power regulation method provided in the first aspect above.

[0019] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, in which a program code is stored. The program code can be called by a processor to execute the power regulation method provided in the first aspect above.

[0020] The solution provided in the present application determines the interface power information corresponding to multiple module interfaces in the power management system according to different working modes, and then determines the target call power in the power management system according to the interface power information. Finally, it is determined whether to obtain the required electric energy from the energy storage module interface or to transmit surplus electric energy to the energy storage module interface according to the target call power. The control logic of the power management system is determined according to different working modes, thereby avoiding the adverse effects of the integrated control logic. Moreover, the working modes and the control logic of the module interfaces are independent of each other. As the working modes or module interfaces increase, the existing control logic will not be affected, thereby improving the scalability of the power management system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 Shown is a block diagram of the equipment in the energy storage system.

[0023] Figure 2 A simplified block diagram of the equipment in the energy storage system is shown.

[0024] Figure 3 A flow chart showing the grid-connected status in the self-generation and self-use mode under the traditional integrated control logic.

[0025] Figure 4 A schematic flow chart of a power regulation method provided in an embodiment of the present application is shown.

[0026] Figure 5 A flow chart of setting the charging and discharging power of an energy storage module interface battery of an energy storage system provided by an embodiment of the present application is shown.

[0027] Figure 6 The energy interaction diagram of multiple module interfaces in the energy storage system in the self-generation and self-use mode is shown.

[0028] Figure 7 The energy interaction diagram of multiple module interfaces in the energy storage system under the peak shaving and valley filling mode is shown.

[0029] Figure 8An energy interaction diagram of multiple module interfaces in an energy storage system in energy storage priority mode is shown.

[0030] Fig. 9 A structural block diagram of an electric energy regulating device provided in an embodiment of the present application is shown.

[0031] Fig.10 A structural block diagram of an electronic device provided in an embodiment of the present application for executing the power regulation method according to an embodiment of the present application is shown.

[0032] Fig.11 A storage medium provided in an embodiment of the present application for storing or carrying program codes for implementing the digital power regulation method according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0034] See also Figure 1 , Figure 1 The equipment block diagram of the energy storage system is shown. In the energy storage system, its main components are a battery pack with a battery management system (BMS) function, a storage type bidirectional inverter unit (PCS), a photovoltaic panel, a monitoring front desk and a monitoring back desk. The PCS is composed of a PV controller (solar charging controller), an ACDC bidirectional converter (AC-DC bidirectional converter), and a DCDC bidirectional converter (DC bidirectional converter). Among them, the PV controller is used to transmit the energy of the photovoltaic panel to the PCS, the ACDC bidirectional converter is used to complete the energy exchange between the PCS and the power grid, and the DCDC bidirectional converter is used to exchange energy between the PCS and the battery pack. As an energy source, the photovoltaic panel has been releasing energy to the system, but its energy intensity is affected by the light intensity, and its energy cannot be guaranteed to be stable at all times. The household load is a household appliance such as a refrigerator and a washing machine mounted on the AC line when using the household energy storage system. Its energy mainly comes from the battery pack, solar panels or the power grid. As a stable energy supply for the system, the battery pack can release energy and absorb energy. It is the center of energy regulation. Regulating the output of the battery pack energy is used to ensure the stability of the system. The power grid is the backup energy of the entire system. When the system energy is insufficient, energy can be absorbed from the power grid to ensure the stability of the system. The monitoring front desk is mainly used to monitor the energy flow and energy exchange in the display system. The monitoring back desk is mainly used to monitor the energy data in the system. The functions of the monitoring front desk and the monitoring back desk are not specifically limited here.

[0035] Will Figure 1 To simplify, Figure 2 As shown, the energy storage system includes an energy storage module interface (BAT), a photovoltaic module interface (PV), a grid module interface (Grid), a load module interface (EPS) and an inverter module (Inverter). The energy storage module interface (BAT) includes a battery pack and, the inverter module (Inverter) includes a DCDC bidirectional converter, an ACDC bidirectional converter and a PV controller, and the photovoltaic module interface (PV) includes a photovoltaic panel. In the energy storage system, when the photovoltaic power generation can meet the needs of the load, battery and grid, the energy relationship between multiple module interfaces can be expressed as P Pv ≈P eps +P bat +P grid , where P Pv is the actual power corresponding to the photovoltaic module interface, P eps is the actual load power flowing through the load module interface, P bat is the actual charging power or actual discharging power of the energy storage module interface, P bat When it is a positive number, it means that the energy storage module interface is in charging state. bat When it is a negative number, it means that the energy storage module interface is in a discharging state. grid is the actual power flowing to the grid in the grid module interface, P grid When it is a positive number, it means that the grid absorbs electric energy from the energy storage system. grid When it is a negative number, it means that the power grid transmits energy to the energy storage system. Since electric energy has a certain loss during the transmission process, the actual power of the photovoltaic module interface in this system is roughly equal to the actual power of the load module interface, the energy storage module interface and the power grid module interface. In some embodiments, within the error range, such as the error range of 5%, it can be regarded as satisfying the relationship between the energy of the above multiple module interfaces.

[0036] See also Figure 3 , Figure 3 A flow chart showing the grid-connected status in the self-generation and self-consumption mode. Figure 3 The control method shown is a conventional energy management system control method, which is described in detail below.

[0037] At the beginning of the program, it is necessary to determine whether the grid connection is normal and whether the PV module interface is normal in the grid-connected mode. When the PV module interface is connected normally, the PV controller is turned on to limit the power input to the PV module interface, and the ACDC converter is turned on to realize the conversion between AC and DC in the energy storage system.

[0038] When the photovoltaic power is greater than the load power, it is determined whether the battery pack of the energy storage module interface in the energy storage system is full. When the battery pack is full, the DCDC bidirectional converter is on standby and does not participate in the work. The excess electric energy generated by the photovoltaic module interface is converted into AC power through the ACDC bidirectional converter and then transmitted to the grid module interface. When the battery pack is not full, the DCDC bidirectional converter begins to convert the DC power generated by the photovoltaic module interface into DC power that the battery pack can receive, that is, to charge the battery pack. When the photovoltaic power is greater than the sum of the load power and the charging power, the excess electric energy is transmitted to the grid module interface. If the photovoltaic power is less than the sum of the load power and the charging power, no further processing is performed.

[0039] When the photovoltaic power is not greater than the load power, determine whether the battery pack of the energy storage module interface is in a power-deficient state. If it is in a power-deficient state, the power grid interface provides the insufficient power of the photovoltaic power to the load module interface, and the DCDC bidirectional converter is on standby, and the battery pack does not discharge. When it is in a non-power-deficient state, turn on the DCDC bidirectional converter and discharge the battery to supplement the insufficient power of the photovoltaic power. At this time, determine whether the power of the energy storage module interface can meet the load power. If it cannot be met, the power grid module interface will supplement the missing electric energy to maintain the operation of the load module interface. If it is met, the photovoltaic module interface and the energy storage module interface will continue to supply power to the load module interface.

[0040] If the PV module interface receives an abnormal signal, after the ACDC controller is turned on, it is determined whether the battery is low on power. If so, the load module interface is powered through the grid module interface, and the DCDC bidirectional converter is in standby mode. If the battery is not low on power, the DCDC bidirectional converter is turned on, and the battery is discharged to supply energy to the load module interface. At this time, it is determined whether the power of the energy storage module interface can meet the load power. If not, the grid module interface provides the remaining power to maintain the operation of the load module interface. If so, the energy storage module interface continues to supply power to the load module interface.

[0041] Above Figure 3The scheme shown is the energy control scheme adopted by the traditional energy management system in the grid-connected state under the self-generation and self-use mode. The above detailed analysis shows that the scheme combines the power control management of each module between the photovoltaic module, battery module, load module and grid module with the operation status management of each module to form an integrated control logic. This control logic is extremely complex and difficult to debug. In addition, the above scheme is only the grid-connected mode under the self-generation and self-use mode, and the control logic of the peak shaving and valley filling mode and the energy storage priority mode has not been considered. If the control logic of different modes is supplemented in the above integrated control logic, the complexity of the above integrated control logic will increase exponentially, which is extremely unfavorable for later management and maintenance. In addition, when a single point failure occurs in the integrated control logic, the entire energy management system will not work. The overall robustness of the integrated control logic is poor.

[0042] In response to the technical problems raised by the background technology and the above-mentioned problems, the present invention proposes an electric energy regulation method, device, electronic device and storage medium, which determine the interface power information corresponding to multiple module interfaces in the electric energy management system according to different working modes, and then determine the target call power in the electric energy management system according to the interface power information, and finally determine whether to obtain the required electric energy from the energy storage module interface or to transmit surplus electric energy to the energy storage module interface according to the target call power. The control logic of the electric energy management system is determined according to different working modes, thereby avoiding the adverse effects of the integrated control logic. Moreover, the working modes and the control logic of the module interfaces are independent of each other. As the working modes or module interfaces increase, the existing control logic will not be affected, thereby improving the scalability of the electric energy management system.

[0043] See also Figure 4 , Figure 4 FIG. 1 is a flow chart of a power regulation method provided by an embodiment of the present application. In a specific embodiment, the power regulation method is applied to Fig. 9 The power regulating device 300 and the electronic device 100 equipped with the power regulating device 300 are shown.

[0044] The following will focus on Figure 4 The process shown is described in detail, and the power regulation method may specifically include the following steps:

[0045] Step S110: According to the current working mode of the power management system, selectively obtain the interface power information corresponding to the photovoltaic module interface, the load module interface and the grid module interface; the interface power information includes the interface power size and the interface power flow direction.

[0046] The power management system is used to manage the power of the photovoltaic module interface, the energy storage module interface, the load module interface and the grid module interface.

[0047] The photovoltaic module interface refers to the interface through which the photovoltaic module is connected to the power management system. By obtaining the interface power information at the photovoltaic module interface, the current actual power of the photovoltaic module can be obtained, including the interface power size and the interface power flow direction of the photovoltaic module interface. In some embodiments, the interface power flow direction of the photovoltaic module interface can be represented by the positive and negative signs of the current actual power of the photovoltaic module. When the current actual power of the photovoltaic module interface is obtained as a positive number, it indicates that the interface power flow direction of the photovoltaic module interface is from the photovoltaic module to the power management system. Since the photovoltaic module is a power generation device, the current actual power of the photovoltaic module interface will not be a negative number under normal circumstances. Therefore, when the current actual power of the photovoltaic module interface is obtained as a negative number, it indicates that the photovoltaic module is abnormal.

[0048] The energy storage module interface refers to the interface for the energy storage module to access the electric energy management system. The energy storage module is used to store electric energy and can be a storage battery such as a lithium battery, a sodium battery, etc. The current actual power of the energy storage module interface can be obtained by obtaining the interface power information at the energy storage module interface, including the interface power size and the interface power flow direction of the energy storage module interface. In some embodiments, the interface power flow direction of the energy storage module interface can be represented by the positive and negative signs of the current actual power of the energy storage module. When the current actual power of the energy storage module interface is obtained as a positive number, it indicates that the energy storage module is in a charging state, and the interface power flow direction of the energy storage module interface is from the electric energy management system to the energy storage module; when the current actual power of the energy storage module interface is obtained as a negative number, it indicates that the energy storage module is in a discharging state, and the interface power flow direction of the energy storage module interface is from the energy storage module to the electric energy management system.

[0049] The load module interface refers to the interface through which the load module is connected to the power management system, wherein the load module is a general term for one or more load devices that are connected to the power management system and use electric energy to work. The current actual power of the load module interface can be obtained by obtaining the interface power information at the load module interface, including the interface power size and the interface power flow direction of the load module interface. In some embodiments, the interface power flow direction of the load module interface can be represented by the positive and negative signs of the current actual power of the load module. When the current actual power of the load module interface is obtained as a positive number, the interface power flow direction of the load module interface is from the power management system to the load module. Since the load module is an electrical device, the current actual power of the load module interface will not be negative under normal circumstances. Therefore, when the current actual power of the load module interface is obtained as a negative number, it indicates that the load module is abnormal.

[0050] The grid module interface refers to the interface of the grid module to access the electric energy management system, wherein the grid can be a mains grid. The current actual power of the grid module interface can be obtained by obtaining the interface power information at the grid module interface, including the interface power size and the interface power flow direction of the grid module interface. In some embodiments, the interface power flow direction of the grid module interface can be represented by the positive and negative signs of the current actual power of the grid module. When the current actual power of the grid module interface is obtained as a positive number, the grid module is in an energy absorption state, and the interface power flow direction of the grid module interface is from the electric energy management system to the grid module; when the current actual power of the grid module interface is obtained as a negative number, the grid module is in an energy release state, and the interface power flow direction of the grid module interface is from the grid module to the electric energy management system.

[0051] In some embodiments, if the energy storage module interface fails, the maximum charging power and the maximum discharging power of the energy storage module interface are configured to 0. If the energy storage capacity of the energy storage module interface exceeds a first preset value, the maximum charging power of the energy storage module interface is configured to 0. If the energy storage capacity of the energy storage module interface is lower than a second preset value, the maximum discharging power of the energy storage module interface is configured to 0. The maximum charging power may refer to the maximum charging power that the energy storage module can withstand, specifically the maximum charging power that the battery can withstand, and the maximum discharging power may refer to the maximum discharging power of the energy storage module, specifically the maximum discharging power of the battery.

[0052] When the energy storage module interface fails, the energy storage module interface can neither deliver electric energy to the electric energy management system nor obtain electric energy from the electric energy management system. The energy storage module interface failure may be due to a failure in the interface, a failure in the energy storage device, or a failure in the DCDC bidirectional converter. It should be understood that the above-mentioned failure types of the energy storage module interface are only used as examples, and the present invention does not limit the specific circumstances of the failure of the energy storage module interface. When the energy storage module interface fails as described above, the electric energy management system provided by the present invention configures the maximum charging power and the maximum discharging power of the energy storage module interface to 0. At this time, the energy storage module interface can neither charge nor discharge, and the electric energy power to be supplemented in the electric energy management system will not flow out from the energy storage module interface, and the surplus electric energy power in the electric energy management system will not flow to the energy storage module interface. That is to say, in the event of a failure in the energy storage module interface, after the power management system sets the maximum charging power and the maximum discharging power of the energy storage module interface to 0, the energy management in the power management system will exclude the energy storage module interface, and perform energy flow management between the photovoltaic module interface, the load module interface, and the grid module interface, so that when the energy storage module interface fails, other modules of the power management system can still work normally without being affected.

[0053] When the energy storage capacity of the energy storage module interface exceeds the first preset value, it means that the energy storage capacity (State of Charge, SOC) reaches the preset height value, and the energy storage device no longer continues to charge. Therefore, the maximum charging power is set to 0. The first preset value can be 95% of the total capacity of the energy storage device, or 98% of the total capacity of the energy storage device. The first preset value can be determined by the user and is not specifically limited here.

[0054] When the energy storage capacity of the energy storage module interface is lower than the second preset value, it means that the energy storage device is continuously discharging, and the energy storage capacity is lower than the second preset value. At this time, the battery no longer continues to discharge. Therefore, the maximum discharge power is set to 0. The second preset value can be the energy storage capacity*(1-discharge depth), where the discharge depth is 95% or 98%. The discharge depth is the ratio between the electric energy currently released by the battery pack and the total capacity of the battery pack. In the present application, the ratio is expressed in the form of a percentage. The representation can also be a decimal, and the representation is not specifically limited here.

[0055] When the energy storage capacity of the energy storage module interface exceeds the first preset value, it means that the energy storage capacity of the energy storage module has reached the configured maximum value and cannot continue to charge, otherwise it will affect the battery life. Therefore, the power management system will configure the maximum charging power of the energy storage module interface to 0. By configuring the maximum charging power of the energy storage module interface to 0, the power management system can stop charging the energy storage module. Similarly, when the energy storage capacity of the energy storage module interface is lower than the second preset value, it means that the energy storage module has released or almost released all the electric energy and cannot continue to discharge, otherwise it will affect the battery life. Therefore, the power management system will configure the maximum discharge power of the energy storage module interface to 0. By configuring the maximum discharge power of the energy storage module interface to 0, the energy storage module can stop discharging to the power management system.

[0056] See also Figure 5 In the specific implementation process, Figure 5 The following is a flow chart showing the battery charging and discharging power setting of the energy storage module interface of the energy storage system provided by an embodiment of the present application. Figure 5It can be obtained that after entering the setting program from the program entry, the battery capacity, battery discharge depth, preset maximum charging power and preset maximum discharge power in the current energy storage module interface are first obtained from the data storage device. First, determine whether the relationship between the battery capacity and the discharge depth satisfies SOC>1-DOD. If so, further determine whether the SOC is less than the preset height value. When the SOC is less than the preset height value, it means that the energy storage module interface is not full, so it can be charged or discharged at this time. When the SOC is greater than or equal to the preset height value, it means that the energy storage module interface is fully charged at this time and cannot be charged, that is, the preset maximum charging power is 0, and only discharge can be performed. The discharge power is limited according to the actual situation and is not limited here. When SOC≤1-DOD, it means that the battery pack has released all the internally stored electrical energy, that is, the maximum discharge power is 0. At this time, the energy storage module interface can only be charged and cannot be discharged.

[0057] In other embodiments, if a failure occurs in the photovoltaic module interface, the current actual power of the photovoltaic module interface is configured to 0. A failure in the photovoltaic module interface indicates that the photovoltaic module interface cannot transmit electric energy to the power management system. At this time, the current actual power corresponding to the photovoltaic module interface is configured to 0 to avoid affecting the control logic of other module interfaces. In other words, in the case of a failure in the photovoltaic module interface, after the power management system configures the current actual power corresponding to the photovoltaic module interface to 0, the energy management in the power management system will exclude the photovoltaic module interface, and perform energy flow management between the energy storage module interface, the load module interface, and the power grid module interface, so that when the photovoltaic module interface fails, other modules of the power management system can still work normally without being affected.

[0058] In the embodiment scheme of the present application, when one or more module interfaces in the power management system fail, other module interfaces can work normally, which solves the problem in the related art that the power management system cannot work when any module interface in the power management system fails, making the power management of the power management system more intelligent and improving the user experience.

[0059] Step S120: Determine the target call power in the power management system according to the interface power size and interface power flow direction in the interface power information corresponding to each interface selectively obtained; the target call power is the power that the power management system needs the energy storage module interface to supply or absorb. In the embodiment of the present application, the working modes include self-generation and self-use mode, peak shaving and valley filling mode, and energy storage priority mode.

[0060] It should be understood that the power management system manages energy through the photovoltaic module interface, the energy storage module interface, the load module interface and the grid module interface. The current actual power of the photovoltaic module interface mainly depends on external factors such as the current light intensity and temperature. The current actual power of the energy storage module interface mainly depends on the current power consumption of the power-consuming equipment connected to the system. The grid module interface mainly depends on the current working mode of the power management system and the power information of the power flow configuration of the municipal power grid. It can be seen that the power management system is more passively managed for the three types of module interfaces, namely the photovoltaic module interface, the energy storage module interface and the grid module interface. Therefore, the power management system can selectively obtain the interface power information of the photovoltaic module interface, the load module interface and the grid module interface according to different working modes. Based on the selectively obtained interface power information, the target call power that the power management system needs to supplement or absorb can be determined. The power management system then calls the energy storage module interface based on the target call power to supply or absorb energy according to the target call power.

[0061] The following is an explanation of the calculation process of the target call power of the power management system in different working modes.

[0062] The self-generation and self-use mode means that the electric energy in the power management system is obtained from the photovoltaic module interface, and this electric energy supplies the power demand of the energy storage module and the load module. If the power management system has surplus electric energy, it will be transmitted to the grid module interface. If the power management system cannot meet the power demand of the load module interface by calling the energy storage module, it can supplement power from the grid module interface. It should be understood that in the self-generation and self-use mode, the grid module has no mandatory requirements for the power flow setting of the power management system. In the self-generation and self-use mode, the excess electricity generated by photovoltaic power can be connected to the grid, and the missing electricity will be supplemented from the grid if the energy storage module cannot supplement it.

[0063] In the self-generation and self-use mode, since the power grid module has no rigid requirements for the power flow power setting of the power management system, in this mode, only the current actual power of the photovoltaic module interface and the load module interface can be obtained, and the target call power in the power management system can be determined according to the difference between the current actual power of the photovoltaic module interface and the current actual power of the load module interface. The current actual power of the load module interface is determined according to the load device connected to the load module interface and the working condition of the load device.

[0064] Specifically, in the self-generation and self-use mode, the formula for obtaining the target power P is: P = P pv -P eps Among them, P PV is the actual power of the PV module interface, P eps It is the current actual power of the load module interface.

[0065] In some embodiments, in the self-generation and self-use mode, if the calculated target call power P is a positive number, it means that the photovoltaic power generation power is greater than the load power consumption, and there is surplus power in the power management system. Therefore, the power management system needs to call the energy storage module interface to absorb energy according to the target call power, that is, call the energy storage module interface for charging. In other embodiments, when the target call power is greater than the maximum charging power of the energy storage module interface (the charging direction is set to forward), the charging power of the energy storage module interface is set to the maximum charging power. At this time, the energy storage module interface maintains the maximum charging power to absorb power from the power management system. If the calculated target call power P is a negative number, it means that the photovoltaic power generation power is less than the load power consumption, and the power management system needs to supplement power. Therefore, the power management system needs to call the energy storage module interface to supply energy according to the target call power, that is, call the energy storage module interface for discharge. In some other embodiments, when the target call power is less than the maximum discharge power of the energy storage module interface (the discharge direction is set to negative), the discharge power of the energy storage module interface is set to the maximum discharge power. At this time, the energy storage module interface maintains the maximum discharge power to discharge to the power management system.

[0066] The peak shaving and valley filling mode means that during the peak period of power consumption in the power grid, the power demand of the power grid connected to the power grid module interface is too large, and the power management system needs to supply energy to the power grid with a larger peak shaving and valley filling power. The power generated by the photovoltaic module in the power management system is not only supplied to the energy storage module and the load module, but also supplies power to the power grid with the power set by the flow. During the low period of power consumption in the power grid, the power demand of the power grid is reduced, and the power management system can transmit energy to the power grid with a smaller power set by the flow or not transmit energy to the power grid. Even when the energy consumption demand of the load connected to the load module interface in the power management system is too large, the power grid can transmit energy to the power management system with the power set by the flow to maintain the power of the power management system stable and sufficient.

[0067] In the peak shaving and valley filling mode, since the power management system also needs to supply or supplement power to the grid module with the current power flow setting power of the grid, in this mode, the power management system needs to obtain the current actual power of the photovoltaic module interface, the current actual power of the load module interface, and the current power flow setting power of the grid module interface. The target call power in the power management system is determined based on the difference between the current actual power of the photovoltaic module interface, the current actual power of the load module interface, and the current power flow setting power of the grid module interface.

[0068] Specifically, in the peak shaving and valley filling mode, the formula for obtaining the target power P of the power management system is: P = P pv -P eps -P gset Among them, PPV is the actual power of the PV module interface, P eps is the current actual power of the load module interface, P gset The current power flow setting power of the power grid module interface can be set according to actual needs. gset When it is a positive number, it means that the power grid module sets the power P from the power management system based on the current power grid flow. gset To absorb electricity; if the current power grid flow sets the power P gset When it is a negative number, it means that the power grid module sets the power P based on the current power grid flow. gset Discharge from the power management system.

[0069] In some embodiments, in the peak shaving and valley filling mode, if the calculated target call power P is a positive number, it means that the photovoltaic power generation power is greater than the sum of the load power and the current power setting power of the power grid module, and there is surplus power in the power management system. Therefore, the power management system needs to call the energy storage module interface to absorb energy according to the target call power, that is, call the energy storage module interface for charging. In other embodiments, when the target call power is greater than the maximum charging power of the energy storage module interface (the charging direction is set to the forward direction), the charging power of the energy storage module interface is set to the maximum charging power. At this time, the energy storage module interface maintains the maximum charging power to absorb power from the power management system. If the calculated target call power P is a negative number, it means that the photovoltaic power generation power is less than the sum of the load power and the current power setting power of the power grid module, and the power management system needs to supplement power. Therefore, the power management system needs to call the energy storage module interface to supply energy according to the target call power, that is, call the energy storage module interface for discharge. In some other embodiments, when the target call power is less than the maximum discharge power of the energy storage module interface (the discharge direction is set to negative), the discharge power of the energy storage module interface is set to the maximum discharge power. At this time, the energy storage module interface maintains the maximum discharge power to discharge to the power management system.

[0070] Energy storage priority mode refers to the power management system obtaining power from the photovoltaic module interface and / or the grid module interface, giving priority to charging the energy storage module corresponding to the energy storage module interface, and giving priority to ensuring that the energy storage module is as fully charged as possible or reaches the preset maximum power value. It should be understood that in the energy storage mode, the grid module has no mandatory requirements for the power flow power setting of the power management system. In the energy storage mode, the excess power generated by photovoltaic power can be connected to the grid, and the missing power can be supplemented from the grid if the energy storage module cannot supplement it.

[0071] In the energy storage priority mode, since the power grid module has no rigid requirements for the flow power setting of the power management system, in this mode, only the current actual power of the photovoltaic module interface and the load module interface can be obtained. Therefore, the power management system can determine the target call power in the power management system based on the difference between the current actual power of the photovoltaic module interface and the current actual power of the load module interface.

[0072] Specifically, in the energy storage priority mode, the formula for obtaining the target call power P can be: P = P pv -P eps Among them, P PV is the actual power of the PV module interface, P eps It is the current actual power of the load module interface.

[0073] In some embodiments, in the energy storage mode, if the calculated target call power P is a positive number, it means that the photovoltaic power generation power is greater than the load power consumption, and there is surplus power in the power management system. Therefore, the power management system needs to call the energy storage module interface to absorb energy, that is, call the energy storage module interface for charging. Since the energy storage priority mode requires priority to charge the energy storage module, it is prioritized to ensure that the energy storage module is as full as possible or reaches the preset maximum power value. Therefore, the power management system can always configure the charging power of the energy storage module interface to the maximum charging power. The power of the energy storage module interface can come from the photovoltaic module or the power grid module. If the calculated target call power P is a negative number, it means that the photovoltaic power generation power is less than the load power consumption, and the power management system needs to supplement power. Therefore, the power management system needs to call the energy storage module interface to supply energy according to the target call power, that is, call the energy storage module interface for discharge. In other embodiments, when the target call power is less than the maximum discharge power of the energy storage module interface (the discharge direction is set to negative), the discharge power of the energy storage module interface is set to the maximum discharge power. At this time, the energy storage module interface maintains the maximum discharge power to discharge to the power management system.

[0074] In the above-mentioned self-generation and self-use mode or energy storage priority mode, if the grid backflow prevention function of the power management system is configured to be turned on, the maximum power released to the grid module interface is configured to be 0. In order to prevent the excess electric energy in the power management system from being transmitted to the grid module interface in the self-generation and self-use mode or the energy storage priority mode, at this time, the grid backflow prevention function is configured to be turned on, and the corresponding maximum power released to the grid module interface is configured to be 0, which is conducive to the circular call of electric energy in the power management system.

[0075] The following describes the details of the PV limiting operation taken when the PV module interface power generation is large.

[0076] During implementation, if the power supply of the photovoltaic module interface exceeds the sum of the tolerable powers of the energy storage module interface, the load module interface and the grid module interface in the current working mode of the power management system, the power supply of the photovoltaic module interface is limited to the sum of the tolerable powers; and when the sum of the tolerable powers exceeds the maximum power supply of the photovoltaic module interface, the power supply of the photovoltaic module interface is limited to the maximum power supply. In some embodiments, the power generation power of the photovoltaic module can be limited by maximum power point tracking (MPPT).

[0077] In different working modes, the sum of the tolerable powers of the energy storage module interface, load module interface and grid module interface is different. In the self-generation and self-use mode and the energy storage priority mode, the sum of the tolerable powers of the energy storage module interface, load module interface and grid module interface is the same, which is the current actual power P of the load module interface. eps , the maximum charging power P of the energy storage module interface chgMax And the maximum power P released by the grid module interface goutset The sum of the three; in the peak shaving and valley filling mode, the sum of the tolerable powers of the energy storage module interface, the load module interface and the grid module interface is the current actual power P of the load module interface. eps , the maximum charging power P of the energy storage module interface chgMax And the current power grid flow setting power P gset .

[0078] Therefore, in the self-generation and self-use mode and the energy storage priority mode, if the energy supply power of the photovoltaic module interface exceeds the sum of the maximum charging power of the energy storage module interface, the current actual power of the load module interface, and the maximum power released to the grid module interface, the energy supply power of the photovoltaic module interface is limited to the sum of the three. PvMax Can be: PvMax =P eps +P chgMax +P goutset , the actual power supply P of the photovoltaic module interface Pv ≤P PvMax .

[0079] In the peak-shaving and valley-filling mode, if the power supply of the photovoltaic module interface exceeds the sum of the maximum charging power of the energy storage module interface, the current actual power of the load module interface, and the current grid flow setting power of the grid module interface, the power supply of the photovoltaic module interface is limited to the sum of the three.PvMax Can be: PvMax =P eps +P chgMax +P gset , the actual power supply P of the photovoltaic module interface Pv ≤P PvMax .

[0080] The above-mentioned power management system limits the maximum power supply of the photovoltaic module interface to the sum of the tolerable powers of the energy storage module interface, the load module interface and the grid module interface under different working modes, thereby avoiding excessive power supply of the photovoltaic module interface, which may cause damage to the energy storage module interface, the load module interface or the grid module interface.

[0081] In some embodiments, if the maximum energy supply power P of the photovoltaic module interface determined in the above different working modes is PvMax Greater than the maximum photovoltaic power generation power P determined by the photovoltaic module based on maximum power point tracking (MPPT) MPPT , then the maximum energy supply power P of the PV module interface PvMax Restricted to P MPPT to avoid damaging the PV modules.

[0082] Step S130: determining the power to be supplemented or the surplus power of the power management system according to the target power call, and then calling the energy storage module interface to supply energy according to the power to be supplemented or absorb energy according to the surplus power.

[0083] When the target power is negative, it means that the power management system needs to supplement the power from the energy storage module interface, so the power management system will call the energy storage module interface to discharge and supply energy to supplement the power that the power management system should supplement. When the target power is positive, it means that the power management system has surplus power and needs to absorb energy through the energy storage module interface, so the power management system will call the energy storage module interface to absorb the surplus power from the power management system.

[0084] In some embodiments, if the absolute value of the electric energy to be compensated exceeds the absolute value of the maximum discharge power of the energy storage module interface, the absolute value of the energy supply power of the energy storage module interface is configured as the absolute value of the preset maximum discharge power; if the absolute value of the surplus electric energy exceeds the absolute value of the preset maximum charging power of the energy storage module interface, the absolute value of the energy absorption power of the energy storage module interface is configured as the absolute value of the preset maximum charging power. The above operation can effectively protect the energy storage module and avoid exceeding the maximum discharge power and maximum charging power of the energy storage module, thereby causing damage to the energy storage module.

[0085] In some embodiments, the operating state of the power management system may be determined based on the current operating mode and target call power of the power management system, which is described below.

[0086] In the specific implementation process, please refer to Figure 6 , Figure 6 The energy interaction diagram of multiple module interfaces in the energy storage system under the self-generation and self-use mode is shown. Figure 6 As can be seen in the figure, the photovoltaic module interface (PV), energy storage module interface (BAT), grid module interface (Grid) and load module interface (EPS) are all connected through the inverter module (Inverter) to form an energy storage system. The inverter module (Inverter) includes an inverter, which can convert DC power into fixed frequency and voltage or frequency and voltage adjustable AC power. Figure 6 In the diagram, the arrow direction refers to the main energy source direction and the main energy output direction of the module. Figure 6 In the self-generation and self-consumption mode, the target call power P based on the power management system in the self-generation and self-consumption mode is P pv -P eps As a judgment quantity, the power management system can be divided into 6 operating states, including battery energy replenishment state, battery grid energy replenishment state, overload state, battery energy absorption state, battery grid energy absorption state, and photovoltaic limitation state.

[0087] When the target calls power P∈[-P dscMax , 0), the power management system is in the battery charging state. In this state, the power management system calculates the target call power and knows that the power generation power of the photovoltaic module interface cannot meet the power consumption of the load module interface, but the difference between the two is within the maximum discharge power of the energy storage module interface. Therefore, the power management system calls the energy storage module interface to supplement the power to be supplemented, thereby meeting the power consumption demand of the load module interface.

[0088] When the target calls power P∈[-P ginMax -P dscMax , -P dscMax ), the power management system is in the battery grid replenishment state. In this state, the power management system calculates the target call power and knows that the sum of the power generation power of the photovoltaic module interface and the maximum discharge power of the energy storage module interface cannot meet the power consumption of the load module interface, but the power consumption lacking in the load module interface is within the maximum power of the grid module interface absorbing energy from the grid. Therefore, the power management system calls the energy storage module interface and the grid module interface to supply power at the same time, thereby meeting the power consumption demand of the load module interface.

[0089] When the target calls power P∈(-∞, -P ginMax -P dscMax), the power management system is in an overload state. In this state, the power management system calculates the target call power and finds that the sum of the power generation power of the photovoltaic module interface, the maximum discharge power of the energy storage module interface, and the maximum power of the power grid module interface absorbing energy from the power grid cannot meet the power demand of the load module interface. Therefore, it means that the load in the power management system is too large. In some embodiments, a tripping circuit breaker can be used to avoid damaging the power management system.

[0090] When the target calls power P∈(0, P chgMax ], the power management system is in the battery energy absorption state. In this state, the power management system calculates the target call power and knows that the power generation power of the photovoltaic module interface exceeds the power demand of the load module interface, and the surplus power is still within the maximum charging power of the energy storage module interface. Therefore, the power management system calls the energy storage module interface to absorb the surplus power, thereby achieving power flow balance in the power management system.

[0091] When the target calls power P∈(P chgMax , P chgMax +P goutMax ], the power management system is in the state of battery-grid energy absorption. In this state, the power management system calculates the target call power and knows that the power generation power of the photovoltaic module interface exceeds the power demand of the load module interface, and the surplus power also exceeds the maximum charging power of the energy storage module interface, but does not exceed the sum of the maximum charging power of the energy storage module interface and the maximum power of the power grid module interface to release energy to the Internet. Therefore, the power management system can call the energy storage module interface and the power grid module interface to absorb the surplus power at the same time. In some embodiments, the power management system can give priority to the energy storage module interface to absorb the surplus power with its maximum charging power, and then release the remaining power to the grid through the power grid module interface.

[0092] When the target calls power P∈(P chgMax +P goutMax , +∞), the power management system is in the photovoltaic limiting state. In this state, the power management system calculates the target call power and knows that the power generation power of the photovoltaic module interface exceeds the power demand of the load module interface, and the surplus power exceeds the sum of the maximum charging power of the energy storage module interface and the maximum power of the grid module interface to release energy to the Internet. Therefore, the power management system can perform PV limitation on the photovoltaic module interface, that is, limit the maximum power generation of the photovoltaic module. In some embodiments, the photovoltaic module can be subject to MPPT (Maximum power point tracking).

[0093] In some embodiments, before the power management system calls the energy storage module interface to discharge and replenish the required electric energy power, it will also determine whether the discharge depth of the energy storage module interface is lower than the minimum power preset value, for example, whether the power is lower than 5%. If it is lower, it means that the power of the energy storage module interface has been released to the limit, so the maximum discharge power of the energy storage module interface is configured to 0, so as to achieve the purpose of preventing the energy storage module interface from discharging.

[0094] In some embodiments, before the power management system calls the energy storage module interface to charge and absorb surplus electric power, it will also determine whether the capacity of the energy storage module interface is higher than the maximum power preset value, for example, whether the power is higher than 95%. If it is higher, it means that the charging amount of the energy storage module interface has reached the peak limit, so the maximum charging power of the energy storage module interface is configured to 0, thereby achieving the purpose of preventing the energy storage module interface from being charged.

[0095] See also Figure 7 , Figure 7 The energy interaction diagram of multiple module interfaces in the energy storage system under the peak shaving and valley filling mode is shown. In the peak shaving and valley filling mode, the target call power P=P based on the power management system under the peak shaving and valley filling mode pv -P eps -P gset As a judgment quantity, the power management system can be divided into five operating states, including battery energy replenishment state under grid flow changes, battery energy replenishment state, battery energy absorption state, battery energy absorption state under photovoltaic limitation state, and battery energy absorption state under grid flow changes.

[0096] When the target calls power P∈[-P dscMax , 0), the power management system is in the battery charging state. In this state, the power management system calculates the target call power and knows that the power generation power of the photovoltaic module interface cannot meet the power consumption of the load module interface and the power grid flow setting power under the power grid flow, but the difference between the three is within the maximum discharge power of the energy storage module interface. Therefore, the power management system calls the energy storage module interface to supplement the power to be supplemented, thereby meeting the power consumption demand of the load module interface and the power grid module interface under the power flow change.

[0097] When the target calls power P∈(-∞, -P dscMax), the power management system is in a battery replenishment state under the change of power grid flow. In this state, the power management system calculates the target call power and knows that the sum of the power generation power of the photovoltaic module interface and the maximum discharge power of the energy storage module interface cannot meet the power consumption of the load module interface and the power grid flow setting power under the power grid flow. Therefore, it means that the power grid demanded by the power management system is too high, and the energy storage module interface and the photovoltaic module interface cannot afford it. In some embodiments, the power grid flow power can be reduced to deliver more power to the load module interface to ensure that the load corresponding to the load module interface works normally.

[0098] When the target calls power P∈(0, P chgMax ], the power management system is in the battery energy absorption state. In this state, the power management system calculates the target call power and knows that the power generation power of the photovoltaic module interface exceeds the power consumption of the load module interface and the grid flow setting power under the grid flow, and the surplus power is still within the maximum charging power of the energy storage module interface. Therefore, the power management system calls the energy storage module interface to absorb the surplus power, thereby achieving power flow balance in the power management system.

[0099] When the target calls power P∈(P chgMax , P chgMax +P pv ], the power management system is in the battery energy absorption state under the photovoltaic limit state. In this state, the power management system calculates the target call power and knows that the power generation power of the photovoltaic module interface exceeds the power demand of the load module interface, and the surplus power also exceeds the maximum charging power of the energy storage module interface, but does not exceed the sum of the maximum charging power of the energy storage module interface and the photovoltaic module interface limit power. Therefore, the power management system can call the energy storage module interface to absorb the surplus power, and can also limit the actual output power of the photovoltaic module interface. In some embodiments, the photovoltaic module can be subject to MPPT (Maximum power point tracking).

[0100] When the target calls power P∈(P chgMax +P pv , +∞), the power management system is in the battery energy absorption state under the change of power grid flow. In this state, the power management system calculates the target call power, and it can be seen that the power transmitted by the grid module interface to the power management system under the change of power grid flow exceeds the power demand of the load module interface, and the surplus power exceeds the maximum charging power of the energy storage module interface.

[0101] See also Figure 8 , Figure 8The energy interaction diagram of multiple module interfaces in the energy storage system under the energy storage priority mode is shown. In the energy storage priority mode, the target call power P=P based on the power management system under the energy storage priority mode pv -P eps As a judgment quantity, the power management system can be divided into three operating states, including overload state, grid energy replenishment state and battery energy absorption state under photovoltaic limitation state.

[0102] When the target calls power P∈[P chgMax -P ginMax , P chgMax ), the power management system is in the state of grid replenishment. In this state, the power management system calculates the target call power and knows that the sum of the power generation power of the photovoltaic module interface and the maximum discharge power of the energy storage module interface cannot meet the power consumption of the load module interface, but the power consumption lacking in the load module interface is within the maximum power of the grid module interface absorbing energy from the grid. Therefore, the power management system calls the energy storage module interface and the grid module interface to supply power at the same time, thereby meeting the power consumption demand of the load module interface.

[0103] When the target calls power P∈(-∞, P chgMax -P ginMax ), the power management system is in an overload state. In this state, the power management system calculates the target call power and finds that the sum of the power generation power of the photovoltaic module interface, the maximum discharge power of the energy storage module interface, and the maximum power of the power grid module interface absorbing energy from the power grid cannot meet the power demand of the load module interface. Therefore, it means that the load in the power management system is too large. In some embodiments, a tripping circuit breaker can be used to avoid damaging the power management system.

[0104] When the target calls power P∈(P chgMax , +∞), the power management system is in the battery energy absorption state under the photovoltaic limitation state. In this state, the power management system calculates the target call power and knows that the power generation power of the photovoltaic module interface exceeds the power demand of the load module interface, and the surplus power exceeds the maximum charging power of the energy storage module interface. Therefore, the photovoltaic module interface is first restricted to limit the power generation power of the photovoltaic module interface to within the maximum charging power of the load module interface and the battery module interface. The power management system then calls the energy storage module interface to absorb the surplus power, thereby achieving power flow balance in the power management system. In some embodiments, the photovoltaic module can be subject to MPPT (Maximum power point tracking) limitation.

[0105] In other implementations, the current working mode and target power of the power management system can be inferred from the operating state of the power management system. When a certain operating state shows a fault, it can be quickly located, saving fault location time and solving the problem of difficult fault location caused by the integrated control logic.

[0106] The solution provided in the present application determines the interface power information corresponding to multiple module interfaces in the power management system according to different working modes, and then determines the target call power in the power management system according to the interface power information. Finally, it is determined whether to obtain the required electric energy from the energy storage module interface or to transmit surplus electric energy to the energy storage module interface according to the target call power. The control logic of the power management system is determined according to different working modes, thereby avoiding the adverse effects of the integrated control logic. Moreover, the working modes and the control logic of the module interfaces are independent of each other. As the working modes or module interfaces increase, the existing control logic will not be affected, thereby improving the scalability of the power management system.

[0107] See also Fig. 9 , which shows a structural block diagram of an electric energy regulating device 300 provided in an embodiment of the present application. The electric energy regulating device 300 is applied to an electronic device 100, and the electric energy regulating device 300 includes: an interface power information acquisition module 310, which is used to selectively acquire the interface power information corresponding to the photovoltaic module interface, the load module interface and the grid module interface according to the current working mode of the electric energy management system; the interface power information includes the interface power size and the interface power flow direction; a target call power determination module 320, which is used to determine the target call power in the electric energy management system according to the interface power size and the interface power flow direction in the interface power information corresponding to each interface obtained selectively; the target call power is the power that the electric energy management system needs the energy storage module interface to supply or absorb energy; an adjustment module 330, which is used to determine the electric energy management system to supplement the electric energy power or the surplus electric energy power according to the target call power, and then call the energy storage module interface to supply energy according to the supplementary electric energy power or absorb energy according to the surplus electric energy power.

[0108] In some embodiments of the present application, the electric energy regulation device 300 also includes: an energy supply power determination module of the energy storage module interface, which is used to configure the absolute value of the energy supply power of the energy storage module interface to the absolute value of the preset maximum discharge power if the absolute value of the electric energy power to be compensated exceeds the absolute value of the preset maximum discharge power of the energy storage module interface; an energy absorption power determination module of the energy storage module interface, which is used to configure the absolute value of the energy absorption power of the energy storage module interface to the absolute value of the preset maximum charging power if the absolute value of the surplus electric energy power exceeds the absolute value of the preset maximum charging power of the energy storage module interface.

[0109] In some embodiments of the present application, the electric energy regulation device 300 further includes: a power configuration module when a failure occurs in the energy storage module interface, which is used to configure the maximum charging power and the maximum discharging power of the energy storage module interface to 0 if the failure occurs in the energy storage module interface; a power configuration module when the energy storage capacity of the energy storage module interface exceeds a first preset value, which is used to configure the maximum charging power of the energy storage module interface to 0 if the energy storage capacity of the energy storage module interface exceeds the first preset value; and a power configuration module when the energy storage capacity of the energy storage module interface is lower than a second preset value, which is used to configure the maximum discharge power of the energy storage module interface to 0 if the energy storage capacity of the energy storage module interface is lower than the second preset value.

[0110] In some implementations of the present application, the working modes include: self-generation and self-use mode, peak shaving and valley filling mode, and energy storage priority mode.

[0111] In some embodiments of the present application, the interface power information acquisition module 310 includes: a data acquisition module in the self-generation and self-use mode, which is used to obtain the current actual power of the photovoltaic module interface and the current actual power of the load module interface in the self-generation and self-use mode respectively; the target call power determination module 320 includes: a target call power determination module in the self-generation and self-use mode, which is used to determine the target call power in the power management system according to the difference between the current actual power of the photovoltaic module interface and the current actual power of the load module interface.

[0112] In some embodiments of the present application, the interface power information acquisition module 310 includes: a data acquisition module in the peak shaving and valley filling mode, which is used to obtain the current actual power of the photovoltaic module interface, the current actual power of the load module interface and the current grid flow setting power of the grid module interface in the peak shaving and valley filling mode; the target call power determination module 320 includes: a target call power determination module in the peak shaving and valley filling mode, which is used to determine the target call power in the power management system according to the difference between the current actual power of the photovoltaic module interface, the current actual power of the load module interface and the current grid flow setting power of the grid module interface.

[0113] In some embodiments, the interface power information acquisition module 310 includes: a data acquisition module in the energy storage priority mode, which is used to obtain the current actual power of the photovoltaic module interface and the load module interface respectively in the energy storage priority mode; the target call power determination module 320 includes: a target call power determination module in the energy storage priority mode, which is used to determine the target call power in the power management system according to the difference between the current actual power of the photovoltaic module interface and the current actual power of the load module interface.

[0114] In some embodiments, the electric energy regulating device 300 also includes: a first photovoltaic module interface power supply limiting module, which is used to limit the power supply power of the photovoltaic module interface to the sum of the tolerable powers of the energy storage module interface, the load module interface and the grid module interface in the current working mode of the electric energy management system if the power supply power of the photovoltaic module interface exceeds the sum of the tolerable powers of the energy storage module interface, the load module interface and the grid module interface in the current working mode of the electric energy management system; and a second photovoltaic module interface power supply limiting module, which is used to limit the power supply power of the photovoltaic module interface to the maximum power supply power if the sum of the tolerable powers exceeds the maximum power supply power of the photovoltaic module interface.

[0115] In some embodiments, the first photovoltaic module interface power supply limiting module also includes: a photovoltaic module interface power supply limiting module in a self-generation and self-use mode, which is used to limit the power supply power of the photovoltaic module interface to within the sum of the maximum charging power of the energy storage module interface, the current actual power of the load module interface and the maximum power released to the grid module interface in the self-generation and self-use mode.

[0116] In some embodiments, the first photovoltaic module interface power supply limiting module also includes: a photovoltaic module interface power supply limiting module in a peak shaving and valley filling mode, which is used to limit the power supply power of the photovoltaic module interface to within the sum of the maximum charging power of the energy storage module interface, the current actual power of the load module interface and the current grid flow setting power of the grid module interface in the peak shaving and valley filling mode.

[0117] In some embodiments, the first photovoltaic module interface power supply limiting module also includes: a photovoltaic module interface power supply limiting module in energy storage priority mode, which is used to limit the power supply power of the photovoltaic module interface to within the sum of the maximum charging power of the energy storage module interface, the current actual power of the load module interface and the maximum power released to the grid module interface in the energy storage priority mode.

[0118] In some embodiments, the electric energy regulation device 300 also includes: a power grid backflow prevention module, which is used to configure the maximum power released to the grid interface to 0 in the self-generation and self-use mode or the energy storage priority mode if the power grid backflow prevention function of the power management system is configured to be turned on.

[0119] In some implementations, the power regulation device 300 further includes: an operation status determination module, configured to determine the operation status of the power management system according to the current operation mode of the power management system and the target call power.

[0120] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described devices and modules can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here.

[0121] In several embodiments provided in the present application, the coupling between modules may be electrical, mechanical or other forms of coupling.

[0122] In addition, each functional module in each embodiment of the present application can be integrated into a processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The above integrated modules can be implemented in the form of hardware or software functional modules.

[0123] Please refer to Fig.10, which shows a structural block diagram of an electronic device provided in an embodiment of the present application. The electronic device 100 can be a switch, a computer, or a control unit with data transmission. The electronic device 100 in the present application may include one or more of the following components: a processor 110, a memory 120, and one or more application programs, wherein the one or more application programs may be stored in the memory 120 and configured to be executed by one or more processors 110, and the one or more programs are configured to execute the method described in the aforementioned method embodiment.

[0124] The processor 110 may include one or more processing cores. The processor 110 uses various interfaces and lines to connect various parts of the entire electronic device 100, and executes various functions and processes data of the electronic device 100 by running or executing instructions, programs, code sets or instruction sets stored in the memory 120, and calling data stored in the memory 120. Optionally, the processor 110 can be implemented in at least one hardware form of digital signal processing (DSP), field-programmable gate array (FPGA), and programmable logic array (PLA). The processor 110 can integrate one or a combination of a central processing unit (CPU), a graphics processing unit (GPU), and a modem. Among them, the CPU mainly processes the operating system, user interface, and application programs; the GPU is responsible for rendering and drawing display content; and the modem is used to process wireless communications. It can be understood that the above-mentioned modem may not be integrated into the processor 110, but may be implemented separately through a communication chip.

[0125] The memory 120 may include a random access memory (RAM) or a read-only memory (ROM). The memory 120 may be used to store instructions, programs, codes, code sets or instruction sets. The memory 120 may include a program storage area and a data storage area, wherein the program storage area may store instructions for implementing an operating system, instructions for implementing at least one function (such as a touch function, a sound playback function, an image playback function, etc.), instructions for implementing the following various method embodiments, etc. The data storage area may also store data (such as a phone book, audio and video data, chat record data) created by the electronic device 100 during use.

[0126] Please refer to Fig.11, which shows a structural block diagram of a computer-readable storage medium provided in an embodiment of the present application. The computer-readable storage medium 200 stores program codes, which can be called by a processor to execute the method described in the above method embodiment.

[0127] The computer-readable storage medium 200 may be an electronic memory such as a flash memory, an EEPROM (electrically erasable programmable read-only memory), an EPROM, a hard disk, or a ROM. Optionally, the computer-readable storage medium 200 includes a non-transitory computer-readable storage medium. The computer-readable storage medium 200 has storage space for program code 210 that performs any method steps of the above method. These program codes can be read from or written to one or more computer program products. The program code 210 can be compressed, for example, in an appropriate form.

[0128] 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 make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for regulating electric energy, characterized in that: Applied in an electric energy management system, the electric energy management system is used for managing electric energy power between a photovoltaic module interface, an energy storage module interface, a load module interface and a grid module interface, the photovoltaic module interface is an interface for a photovoltaic module to access the electric energy management system, the energy storage module interface is an interface for an energy storage module to access the electric energy management system, the load module interface is an interface for a load module to access the electric energy management system, the grid module interface is an interface for a grid module to access the electric energy management system, and the method comprises: According to the current working mode of the power management system, selectively obtain the interface power information corresponding to the photovoltaic module interface, the load module interface and the grid module interface; the interface power information includes the interface power size and the interface power flow direction; Determine the target call power in the power management system according to the interface power size and interface power flow direction in the interface power information corresponding to each interface selectively obtained; the target call power is the power that the power management system requires the energy storage module interface to supply or absorb energy; According to the target power call, the power management system should compensate the power or the surplus power is determined, and then the energy storage module interface is called to supply energy according to the power to be compensated or to absorb energy according to the surplus power.

2. The method according to claim 1, characterized in that The method further comprises: If the absolute value of the electric energy to be compensated exceeds the absolute value of the maximum discharge power of the energy storage module interface, the absolute value of the energy supply power of the energy storage module interface is configured to be the absolute value of the maximum discharge power; If the absolute value of the surplus electric energy power exceeds the absolute value of the maximum charging power of the energy storage module interface, the absolute value of the energy absorption power of the energy storage module interface is configured as the absolute value of the maximum charging power.

3. The method according to claim 1, characterized in that The method further comprises: If the energy storage module interface fails, the maximum charging power and the maximum discharging power of the energy storage module interface are configured to 0; If the energy storage capacity of the energy storage module interface exceeds a first preset value, configuring the maximum charging power of the energy storage module interface to 0; If the energy storage capacity of the energy storage module interface is lower than a second preset value, the maximum discharge power of the energy storage module interface is configured to be 0.

4. The method according to claim 1, characterized in that The working modes include: self-generation and self-use mode, peak shaving and valley filling mode, and energy storage priority mode.

5. The method according to claim 4, characterized in that The selectively acquiring the interface power information corresponding to each of the photovoltaic module interface, the load module interface and the grid module interface according to the current working mode of the electric energy management system includes: In the self-generation and self-use mode, respectively obtaining the current actual power of the photovoltaic module interface and the load module interface; Correspondingly, determining the target call power in the power management system according to the interface power size and the interface power flow direction in the interface power information corresponding to each interface obtained selectively includes: The target call power in the electric energy management system is determined according to the difference between the current actual power of the photovoltaic module interface and the current actual power of the load module interface.

6. The method according to claim 4, characterized in that The selectively acquiring the interface power information corresponding to each of the photovoltaic module interface, the load module interface and the grid module interface according to the current working mode of the electric energy management system includes: In the peak shaving and valley filling mode, respectively obtaining the current actual power of the photovoltaic module interface, the current actual power of the load module interface, and the current grid flow setting power of the grid module interface; Correspondingly, determining the target call power in the power management system according to the interface power size and the interface power flow direction in the interface power information corresponding to each interface obtained selectively includes: The target call power in the power management system is determined according to the difference between the current actual power of the photovoltaic module interface, the current actual power of the load module interface, and the current grid flow setting power of the grid module interface.

7. The method according to claim 4, characterized in that The selectively acquiring the interface power information corresponding to each of the photovoltaic module interface, the load module interface and the grid module interface according to the current working mode of the electric energy management system includes: In the energy storage priority mode, respectively obtaining the current actual power of the photovoltaic module interface and the current actual power of the load module interface; Correspondingly, determining the target call power in the power management system according to the interface power size and the interface power flow direction in the interface power information corresponding to each interface obtained selectively includes: The target call power in the electric energy management system is determined according to the difference between the current actual power of the photovoltaic module interface and the current actual power of the load module interface.

8. The method according to claim 4, characterized in that The method further comprises: If the energy supply power of the photovoltaic module interface exceeds the sum of the tolerable powers of the energy storage module interface, the load module interface and the grid module interface in the current working mode of the power management system, the energy supply power of the photovoltaic module interface is limited to the sum of the tolerable powers; and When the sum of the tolerable powers exceeds the maximum power supply of the photovoltaic module interface, the power supply of the photovoltaic module interface is limited within the maximum power supply.

9. The method according to claim 8, characterized in that If the energy supply power of the photovoltaic module interface exceeds the sum of the tolerable powers of the energy storage module interface, the load module interface and the grid module interface in the current working mode of the electric energy management system, the energy supply power of the photovoltaic module interface is limited to the sum of the tolerable powers, including: In the self-generation and self-use mode, if the energy supply power of the photovoltaic module interface exceeds the sum of the maximum charging power of the energy storage module interface, the current actual power of the load module interface and the maximum power released to the grid module interface, the energy supply power of the photovoltaic module interface will be limited to the sum of the three.

10. The method according to claim 8, characterized in that If the energy supply power of the photovoltaic module interface exceeds the sum of the tolerable powers of the energy storage module interface, the load module interface and the grid module interface in the current working mode of the electric energy management system, the energy supply power of the photovoltaic module interface is limited to the sum of the tolerable powers, including: In the peak shaving and valley filling mode, if the energy supply power of the photovoltaic module interface exceeds the sum of the maximum charging power of the energy storage module interface, the current actual power of the load module interface and the current grid flow setting power of the grid module interface, the energy supply power of the photovoltaic module interface is limited to the sum of the three.

11. The method according to claim 8, characterized in that If the energy supply power of the photovoltaic module interface exceeds the sum of the tolerable powers of the energy storage module interface, the load module interface and the grid module interface in the current working mode of the electric energy management system, the energy supply power of the photovoltaic module interface is limited to the sum of the tolerable powers, including: In the energy storage priority mode, if the energy supply power of the photovoltaic module interface exceeds the sum of the maximum charging power of the energy storage module interface, the current actual power of the load module interface and the maximum power released to the grid module interface, the energy supply power of the photovoltaic module interface will be limited to the sum of the three.

12. The method according to claim 4, characterized in that The method further comprises: In the self-generation and self-use mode or the energy storage priority mode, if the grid backflow prevention function of the power management system is configured to be turned on, the maximum power released to the grid interface of the grid module is configured to be 0.

13. The method according to claim 4, characterized in that The method further includes: determining the operating state of the power management system according to the current operating mode of the power management system and the target call power.

14. An electric energy regulating device, characterized in that: The device comprises: An interface power information acquisition module is used to selectively acquire the interface power information corresponding to the photovoltaic module interface, the load module interface and the grid module interface according to the current working mode of the power management system; the interface power information includes the interface power size and the interface power flow direction; A target call power determination module is used to determine the target call power in the power management system according to the interface power size and interface power flow direction in the interface power information corresponding to each interface selectively obtained; the target call power is the power that the power management system requires the energy storage module interface to supply or absorb energy; The regulating module is used to call the power according to the target, determine the power that the electric energy management system should supplement or the surplus power, and then call the energy storage module interface to supply energy according to the power that should be supplemented or absorb energy according to the surplus power, wherein the photovoltaic module interface is the interface for the photovoltaic module to access the electric energy management system, the energy storage module interface is the interface for the energy storage module to access the electric energy management system, the load module interface is the interface for the load module to access the electric energy management system, and the power grid module interface is the interface for the power grid module to access the electric energy management system.

15. An electronic device, characterized in that: include: one or more processors; Memory; One or more application programs, wherein the one or more application programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs are configured to execute the method according to any one of claims 1-13.

16. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores program codes, which can be called by a processor to execute the method according to any one of claims 1 to 13.

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