Standby control method for energy storage inverter and related device

Abstract

The present application relates to the technical field of energy storage inverters, and relates to a standby control method for an energy storage inverter and a related device. The method embodiment comprises: acquiring the remaining power of a storage battery corresponding to an energy storage inverter in an operation mode, and on the basis of the remaining power, determining whether to switch the energy storage inverter to a standby mode; in the standby mode, supplying power to a load by means of an alternating-current power grid, and storing power in a direct-current side bus capacitor connected to the alternating-current power grid by means of a grid-connected relay; and when the alternating-current power grid cannot supply power to the load, turning off the grid-connected relay, supplying the power stored in the direct-current side bus capacitor to a control system, and by means of the control system and on the basis of the remaining power of the storage battery, determining whether to wake up the storage battery. In the standby mode provided by the embodiment, emergency energy of a storage battery is ensured, power loss in the standby mode is reduced, and when a power grid cannot supply power, the storage battery can be timely wakened up to ensure the emergency power utilization requirement of a load, thereby expanding the application scenarios of energy storage inverters.

Description

Standby control method of energy storage inverter and related equipment

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on October 26, 2023, with application number 202311401627.3 and application name “Standby control method of energy storage inverter and related equipment”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of energy storage inverters, and in particular to a standby control method for an energy storage inverter and related equipment. Background Art

[0003] The energy storage inverter connects the photovoltaic panels, batteries, and the power grid. Generally, the photovoltaic panels generate electricity to charge the batteries during the day, and the batteries power the loads at night. When the photovoltaic panels are unable to supply power and the remaining battery power is insufficient, there are two general approaches in the relevant technology: 1. Shut down the entire energy storage inverter and draw power from the grid to supply auxiliary power. However, when the grid fails, the auxiliary power supply will immediately lose power, and the batteries will not be able to be awakened to provide emergency power to the loads, making it difficult to meet the emergency power needs of the loads. 3. Draw power directly from the grid to maintain the operation of the energy storage inverter without shutting down the batteries. Although the batteries can serve as an emergency energy source to power the loads when the grid fails, this method has problems such as large power loss and poor power supply economy.

[0004] Currently, no effective solutions have been proposed to address the problems of large power supply losses, poor economic efficiency during power supply, and inability of batteries to start in time to meet the emergency power needs of loads during power grid failures.

[0005] Summary of the Invention

[0006] The embodiments of the present invention provide a standby control method for an energy storage inverter and related equipment, which at least solve the problems existing in the related art, such as large power supply loss, poor economy during power supply, and difficulty in meeting the emergency power demand of the load due to the inability of the battery to start in time when the power grid fails.

[0007] In order to solve the above problem, one aspect of an embodiment of the present invention provides a standby control method for an energy storage inverter, comprising:

[0008] Obtain the remaining power of the battery corresponding to the energy storage inverter in the running mode, and determine whether to switch the energy storage inverter to the standby mode based on the remaining power; wherein, the battery corresponding to the energy storage inverter in the running mode is in the started state, and the battery corresponding to the energy storage inverter in the standby mode is in the shut-down state;

[0009] In standby mode, the load is powered by the AC grid, and the DC bus capacitor in the energy storage inverter is connected to the AC grid through a grid-connected relay to store electricity in the DC bus capacitor. When the AC grid cannot supply power to the load, the grid-connected relay is disconnected, and the control system is powered by the electricity stored in the DC bus capacitor. The control system then determines whether to wake up the battery based on the remaining battery power.

[0010] In some embodiments, the step of determining whether to switch the energy storage inverter to the standby mode according to the remaining power includes:

[0011] Obtaining a first preset threshold value of remaining power, and determining whether the remaining power is less than the first preset threshold value of remaining power;

[0012] If the remaining power is less than the first preset threshold of the remaining power, it is determined whether the photovoltaic component is in the power generation state. If the photovoltaic component is in the power generation state, the energy storage inverter remains in the operating mode; if the photovoltaic component is in the power generation state, the energy storage inverter is switched from the operating mode to the standby mode.

[0013] In some embodiments, if the remaining power of the battery is less than a first preset remaining power threshold and the photovoltaic assembly is in a state where it cannot generate electricity, the method further includes:

[0014] Obtaining the charging status of the energy storage inverter; wherein the charging status includes the charging connection status and the charging time period;

[0015] The energy storage inverter is judged to determine whether it meets the charging conditions according to the charging status. If the energy storage inverter does not meet the charging conditions, the energy storage inverter is switched from the running mode to the standby mode.

[0016] In some embodiments, when the AC grid fails to supply power to the load and the grid-connected relay is disconnected, the method further includes:

[0017] Obtain the current remaining power of the battery, and determine whether to wake up the battery based on the current remaining power; if the current remaining power is greater than a second preset threshold value of the remaining power, switch the energy storage inverter from standby mode to running mode, wake up the battery and close the grid-connected relay, and supply power to the load through the battery; if the current remaining power is less than or equal to the second preset threshold value of the remaining power, do not wake up the startup battery to supply power to the load.

[0018] In some embodiments, in the standby mode, the method further comprises:

[0019] Determine whether the photovoltaic module meets the power generation conditions. If so, power is supplied to the load through the photovoltaic module, and when the load power supply is met, the battery is charged through the photovoltaic module; if not, the battery remains in the off state.

[0020] In some embodiments, in the standby mode, if the photovoltaic assembly does not meet the power generation condition, the method further includes:

[0021] The charging status of the energy storage inverter is obtained. If the charging status indicates that the energy storage inverter meets the charging conditions, the battery is awakened for charging.

[0022] In some embodiments, if the charging status indicates that the energy storage inverter meets the charging conditions, the step of waking up the battery for charging includes:

[0023] Obtaining the current remaining power of the battery, and if the current remaining power of the battery is greater than a second preset remaining power threshold, waking up the battery for charging if all charging conditions meet the charging conditions;

[0024] If the current remaining power of the battery is less than or equal to a second preset remaining power threshold, the battery is awakened for charging if the charging connection state meets the charging condition.

[0025] In order to solve the above problem, another aspect of an embodiment of the present invention provides a standby control system for an energy storage inverter, comprising:

[0026] A standby mode switching unit, configured to obtain the remaining power of the battery corresponding to the energy storage inverter in the operating mode, and determine whether to switch the energy storage inverter to the standby mode based on the remaining power; wherein, in the operating mode, the battery corresponding to the energy storage inverter is in the starting state, and in the standby mode, the battery corresponding to the energy storage inverter is in the off state;

[0027] The standby control unit is used to supply power to the load through the AC power grid in standby mode, and the DC side bus capacitor in the energy storage inverter is connected to the AC power grid through the grid-connected relay to store electricity in the DC side bus capacitor; when the AC power grid cannot supply power to the load, the grid-connected relay is disconnected, and the control system is powered by the electricity stored in the DC side bus capacitor, and then the control system determines whether to wake up the battery based on the remaining battery power.

[0028] In order to solve the above problems, another aspect of an embodiment of the present invention provides an energy storage inverter, including: a processor, and a memory for storing a program, the program including instructions, which, when executed by the processor, enable the processor to execute any of the above-mentioned standby control methods for the energy storage inverter.

[0029] In order to solve the above problem, another aspect of the embodiments of the present invention provides a non-transitory machine-readable medium storing computer instructions, where the computer instructions are used to enable a computer to execute any one of the standby control methods for energy storage inverters.

[0030] The beneficial effects of the embodiments of the present invention are as follows: by obtaining the remaining power of the battery corresponding to the energy storage inverter in the operating mode, it is determined whether to switch the energy storage inverter to the standby mode according to the remaining power; wherein, the battery corresponding to the energy storage inverter in the operating mode is in the starting state, and the battery corresponding to the energy storage inverter in the standby mode is in the off state; in the standby mode, power is supplied to the load through the AC power grid, and the DC side bus capacitor in the energy storage inverter is connected to the AC power grid through the grid-connected relay to store power in the DC side bus capacitor; when the AC power grid cannot supply power to the load, the grid-connected relay is disconnected, and the power stored in the DC side bus capacitor is used to power the control system, and then the control system determines whether to wake up the battery according to the remaining power of the battery. The technical means overcomes the problems existing in the related technologies such as large power supply loss, poor economy during power supply, and power outages during grid failure. The problem that the battery cannot be started in time and cannot meet the emergency power demand of the load is solved. When the photovoltaic power generation cannot be supplied and the remaining power of the battery is insufficient, the energy storage inverter is not shut down. Instead, the energy storage inverter is switched to standby mode, the battery is shut down, and the AC power grid is used to power the load and the DC side bus capacitor. When the AC power grid encounters a power outage, the power in the DC side bus capacitor can be used to wake up the battery in time. The standby mode provided by the embodiment of the present invention ensures the emergency energy of the battery, reduces the standby power loss, and can wake up the battery in time when the power grid cannot supply power to ensure the emergency power demand of the load, expanding the applicable scenarios of the energy storage inverter.

[0031] The details of one or more embodiments of the invention are set forth in the accompanying drawings and the description below so that other features, objects, and advantages of the invention are more readily apparent. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other embodiments can be derived from these drawings without inventive effort.

[0033] FIG1 is a flow chart of a standby control method for an energy storage inverter according to an embodiment of the present invention.

[0034] FIG2 is a flow chart of a standby control method for an energy storage inverter according to another embodiment of the present invention.

[0035] FIG3 is a schematic diagram of a framework of a standby control system of an energy storage inverter provided in yet another embodiment of the present invention.

[0036] FIG4 is a schematic diagram showing the connection between the energy storage inverter and the photovoltaic module, the power grid and the load according to an embodiment of the present invention.

[0037] FIG5 is a schematic structural diagram of the electronic device of this embodiment. DETAILED DESCRIPTION

[0038] The following describes embodiments of the present invention in more detail with reference to the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as being limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0039] When the photovoltaic module is unable to supply power and the remaining battery power is insufficient, one scenario in the related technology is to directly charge the battery through the AC power grid to meet the power demand of the load. In this method, the battery is always in a working state. Even if the AC power grid is cut off, the energy storage inverter can switch to the off-grid operation module in time. However, since it is necessary to constantly draw power from the AC power grid to maintain the operation of the battery, it results in large power loss and poor economic efficiency during the power supply period. Another scenario is: when the photovoltaic module is unable to supply power and the remaining battery power is insufficient, the energy storage inverter is directly turned off and the load is directly powered by the AC power grid. When the battery meets the charging requirements, the energy storage inverter is awakened. However, if the power grid is cut off at this time, the energy storage inverter cannot be started, making it difficult to meet the power demand of the load. There are problems with poor control effect of the energy storage inverter and poor user experience.

[0040] In order to solve the above problems, an embodiment of the present invention provides a standby control method for an energy storage inverter. As shown in FIG1 , the standby control method for an energy storage inverter mainly includes:

[0041] Step S101: Obtain the remaining power of the battery corresponding to the energy storage inverter in the running mode, and determine whether to switch the energy storage inverter to the standby mode based on the remaining power; wherein, in the running mode, the battery corresponding to the energy storage inverter is in the started state, and in the standby mode, the battery corresponding to the energy storage inverter is in the turned-off state.

[0042] The remaining capacity provided in the embodiments of the present invention, also known as the State of Charge (SOC), is a parameter that reflects the percentage of the current charge in a battery pack relative to its total available capacity. Continuing to operate a battery with a low remaining capacity will increase battery energy consumption, leading to insufficient emergency energy.

[0043] Among them, in the operation mode provided by the embodiment of the present invention, the battery is in the start-up state. If the photovoltaic module can generate electricity, the photovoltaic module will supply power to the load, and when the power demand of the load is met, the photovoltaic module can charge the battery; if the photovoltaic module cannot generate electricity, the battery will supply power to the load in the operation mode. In the standby mode provided by the embodiment of the present invention, the battery is in the off state, and the load is supplied by the AC power grid; if the power grid cannot supply power to the load due to a fault or power outage, the control system determines whether to wake up the battery to supply power to the load based on the remaining power of the battery. Through the above settings, when the photovoltaic module cannot supply power, the remaining power of the battery in the operation mode is obtained, and then it is determined whether to switch the energy storage inverter from the operation mode to the standby mode, thereby reducing power supply loss.

[0044] Step S102: In standby mode, the AC grid supplies power to the load, and the DC bus capacitor in the energy storage inverter is connected to the AC grid via a grid-connected relay to store electricity in the DC bus capacitor. When the AC grid is unable to supply power to the load, the grid-connected relay is disconnected, and the control system is powered by the electricity stored in the DC bus capacitor. The control system then determines whether to wake up the battery based on the remaining battery charge.

[0045] In the standby mode provided by the embodiments of the present invention, all switching devices in the energy storage inverter cease operation and the battery is shut down to reduce battery energy consumption and maintain a certain level of emergency energy. The AC power grid maintains a connection to the energy storage inverter via an uncontrolled rectifier circuit (wherein the uncontrolled rectifier circuit is a rectifier circuit composed of rectifier diodes without a control function). The DC bus capacitor in the energy storage inverter is connected to the AC grid via a grid-connected relay, so that the DC bus capacitor maintains a relatively high voltage. With this arrangement, even if the AC grid power grid suffers a power outage, the charge in the DC bus capacitor can be promptly utilized to power the control system, thereby waking up the battery of the energy storage inverter through the control system and continuing operation using the energy in the battery. This ensures the power demand of the load and improves the standby control effect of the energy storage inverter.

[0046] In some embodiments, the step of determining whether to switch the energy storage inverter to the standby mode based on the remaining power includes: obtaining a first preset threshold value of the remaining power, and determining whether the remaining power is less than the first preset threshold value of the remaining power; if the remaining power is less than the first preset threshold value of the remaining power, determining whether the photovoltaic component is in a power generation state; if the photovoltaic component is in a power generation state, the energy storage inverter remains in the operating mode; if the photovoltaic component is in a state where it cannot generate power, the energy storage inverter is switched from the operating mode to the standby mode.

[0047] When the PV panels are capable of generating electricity, they can supply power to the load and charge the battery through the PV panels. In this case, there is no need to enter standby mode. Therefore, when the remaining battery charge is less than the first preset remaining charge threshold, the power generation status of the PV panels continues to be determined. When the PV panels are unable to generate electricity, the energy storage inverter switches from operating mode to standby mode.

[0048] In some embodiments, the first preset remaining power threshold can be set to 50% of the total power. That is, if the first remaining power falls below 50% of the total power, the energy storage inverter switches from operating mode to standby mode, allowing the remaining power in the battery to be used as an emergency energy backup. It should be noted that the above values ​​are merely examples, and the first preset remaining power threshold can be set based on the actual battery conditions.

[0049] In some embodiments, if the remaining power of the battery is less than a first preset remaining power threshold and the photovoltaic component is unable to generate electricity, the above method further includes: obtaining a charging status of the energy storage inverter; wherein the charging status includes a charging connection status and a charging time period; judging whether the energy storage inverter meets the charging conditions based on the charging status, and if the energy storage inverter does not meet the charging conditions, switching the energy storage inverter from the running mode to the standby mode.

[0050] The charging connection status provided in the embodiment of the present invention includes whether the energy storage inverter is connected to the AC power grid; the charging time period refers to a preset time period for charging the battery corresponding to the energy storage inverter through the AC power grid.

[0051] Before switching the energy storage inverter from the running mode to the standby mode, the charging condition of the energy storage inverter can also be judged. If the energy storage inverter does not meet the charging condition and the remaining power of the battery is less than the first preset threshold of the remaining power, in order to reduce the energy consumption of the battery and save a certain amount of emergency energy, the battery needs to be switched from the running mode to the standby mode.

[0052] In some embodiments, the aforementioned charging conditions also include the presence of an irreversible fault in the energy storage inverter. Accordingly, failure to meet the charging conditions means that the AC grid is unable to charge the battery, the battery corresponding to the energy storage inverter is not within the set charging time period for the AC grid to charge the battery, or the energy storage inverter itself has an irreversible fault.

[0053] In some embodiments, when the AC power grid is unable to supply power to the load due to a fault or power outage, after disconnecting the grid-connected relay, the above method further includes: obtaining the current remaining power of the battery, and determining whether to wake up the battery based on the current remaining power; if the current remaining power is greater than a second preset threshold of remaining power, switching the energy storage inverter from standby mode to operating mode, waking up the battery and closing the grid-connected relay, and supplying power to the load through the battery; if the current remaining power is less than or equal to the second preset threshold of remaining power, not waking up the startup battery to supply power to the load.

[0054] When the photovoltaic module is unable to supply power and the remaining power of the battery does not meet the first preset threshold value of remaining power, the standby mode provided by the present application does not require the energy storage inverter to be completely shut down. It only needs to stop the switching device in the energy storage inverter from operating. The control system obtains power from the AC grid to maintain operation. At the same time, a DC bus capacitor is connected in parallel on the DC bus. While the AC grid provides power to the load, the AC grid provides power to the DC bus capacitor of the energy storage inverter through an uncontrolled rectifier circuit, so that the DC bus capacitor maintains a higher voltage and stores power in the DC bus capacitor. When the AC grid provides power, the grid-connected relay is disconnected, so that the connection between the AC grid and the energy storage inverter is completely disconnected. At this time, the DC bus capacitor discharges and continues to supply power to the control system to maintain the power consumption of the control system. The control system determines whether the battery needs to be awakened based on the current remaining power of the battery. The battery wake-up requirement is: when the remaining power in the battery is greater than the second preset remaining power threshold, that is, when there is still a certain amount of power in the battery, the energy storage inverter is woken up by the control system, and the grid-connected relay is controlled to close, and the grid-connected switch is switched to put the energy storage inverter and the grid in an off-grid state, and then the load is powered by the power in the battery, avoiding the direct shutdown of the energy storage inverter affecting the power demand of the load.

[0055] In some embodiments, in standby mode, the above method further includes: determining whether the photovoltaic component meets the power generation conditions, and if so, supplying power to the load through the photovoltaic component, and charging the battery through the photovoltaic component when the load power supply conditions are met; if not, the battery remains in the off state.

[0056] The economy of photovoltaic panel power supply is better than that of AC grid power supply. In standby mode, the photovoltaic panel can be tested to determine whether it meets the power generation conditions. When the photovoltaic panel is able to generate electricity, it can directly supply power to the load through the photovoltaic panel, and when the load power supply is met, the battery can be awakened for charging.

[0057] In some embodiments, in standby mode, if the photovoltaic assembly does not meet the power generation conditions, the method further includes: obtaining a charging status of the energy storage inverter, and if the charging status indicates that the energy storage inverter meets the charging conditions, waking up the battery for charging.

[0058] In some embodiments, if the charging status indicates that the energy storage inverter meets the charging conditions, the step of waking up the battery for charging includes: obtaining the current remaining power of the battery; if the current remaining power of the battery is greater than a second preset threshold value of the remaining power, waking up the battery for charging when all charging states meet the charging conditions; if the current remaining power of the battery is less than or equal to the second preset threshold value of the remaining power, waking up the battery for charging when the charging connection status meets the charging conditions.

[0059] Among them, the value of the second preset threshold of remaining power is less than the value of the first preset threshold of remaining power. The purpose of setting the preset threshold of the first preset threshold of remaining power is to determine whether to switch the energy storage inverter from the operating mode to the standby mode, reduce the energy consumption of the energy storage inverter, and maintain a certain emergency energy. The purpose of the second preset threshold of remaining power is to determine the conditions for waking up the battery for charging when the photovoltaic module is in standby mode and cannot generate electricity, in order to avoid damage to the battery and ensure the performance and service life of the battery. According to a specific embodiment of the embodiment of the present invention, the second preset threshold of remaining power can be set to 5% of the total power, that is, in standby mode, if the current remaining power obtained is lower than 5% of the total power, there is no need to consider whether the charging time period is met. As long as the charging connection status is met, the energy storage inverter can be immediately woken up to charge the battery.

[0060] The above steps provide a scenario for waking up the battery for charging in standby mode, that is, based on the current remaining power of the battery, if the current remaining power of the battery is large (meaning the current remaining power is greater than the second preset remaining power threshold), charging can be performed after the preset charging time period is met. If the remaining power of the battery is small (meaning the current remaining power is less than or equal to the second preset remaining power threshold), in order to ensure the battery performance and avoid the risk of power loss, the charging time period does not need to be considered, and the battery can be woken up for charging as long as the charging connection status is met.

[0061] The standby control method of the energy storage inverter provided in the embodiment of the present invention determines whether to switch the energy storage inverter to the standby mode according to the remaining power by obtaining the remaining power of the battery corresponding to the energy storage inverter in the operating mode; wherein, the battery corresponding to the energy storage inverter in the operating mode is in the starting state, and the battery corresponding to the energy storage inverter in the standby mode is in the off state; in the standby mode, power is supplied to the load through the AC power grid, and the DC side bus capacitor in the energy storage inverter is connected to the AC power grid through the grid-connected relay to store power in the DC side bus capacitor; when the AC power grid cannot supply power to the load, the grid-connected relay is disconnected, and the power stored in the DC side bus capacitor is used to power the control system, and then the control system determines whether to wake up the battery according to the remaining power of the battery. The technical means overcomes the problems existing in the related technologies such as large power supply loss, poor economy during power supply, and difficulty in meeting the emergency power demand of the load due to the inability of the battery to start in time when the power grid fails. It is achieved that when the photovoltaic power supply cannot be supplied and the remaining power of the battery is insufficient, the energy storage inverter is not shut down, but the energy storage inverter is switched to standby mode, the battery is shut down, and the AC power grid is used to supply power to the load and the DC side bus capacitor. When the AC power grid encounters a power outage, the power in the DC side bus capacitor can be used to wake up the battery in time. In the standby mode provided by the embodiment of the present invention, the emergency energy of the battery is guaranteed, the standby power loss is reduced, and the battery can be woken up in time when the power grid cannot supply power to ensure the emergency power demand of the load, thereby expanding the applicable scenarios of the energy storage inverter.

[0062] An embodiment of the present invention further provides a standby control method for an energy storage inverter, which is applied to an energy storage inverter connected to a photovoltaic module, an AC power grid, and a load, respectively, and the photovoltaic module corresponding to the energy storage inverter is currently unable to supply power. As shown in Figure 2, the standby control method for the energy storage inverter provided by the embodiment of the present invention includes:

[0063] Step S201: Obtain the remaining power of the battery corresponding to the energy storage inverter in the operation mode and a first preset remaining power threshold.

[0064] Using the remaining power as an important reference indicator for judging the mode conversion of the energy storage inverter can help reduce battery loss and preserve a certain amount of emergency energy on the one hand, and ensure the power demand of the load on the other hand.

[0065] Step S202: Determine whether the remaining power is less than a first preset remaining power threshold. If so, that is, the remaining power is less than the first preset remaining power threshold, execute step S203; if not, that is, the remaining power is greater than or equal to the first preset remaining power threshold, execute step S205.

[0066] In some embodiments, the first preset remaining power threshold can be set to 50% of the total power. That is, if the remaining power falls below 50% of the total power, the energy storage inverter will switch from operating mode to standby mode, allowing the remaining power in the battery to be used as an emergency energy backup. It should be noted that the above values ​​are only examples, and the first preset remaining power threshold can be set based on the actual battery conditions.

[0067] Step S203, determining whether the photovoltaic module is in a power generation state, if so, executing step S205, if not, executing step S204.

[0068] Specifically, the power generation of photovoltaic modules varies according to weather changes. If the photovoltaic modules are in the power generation state, they can power the load and the battery. Therefore, the battery can be in the start-up state to ensure that the photovoltaic modules supply power to the battery while maintaining the power supply to the load. If the photovoltaic modules cannot generate power, the load needs to be powered by the AC power grid, and whether the battery can obtain electricity from the AC power grid needs to be determined according to actual conditions.

[0069] Step S204: Obtain the charging status of the energy storage inverter and determine whether the energy storage inverter meets the charging conditions based on the charging status. If so, the energy storage inverter meets the charging conditions, and the energy storage inverter is charged and step S205 is executed; if not, the energy storage inverter does not meet the charging conditions, and step S206 is executed.

[0070] If it is determined that the remaining battery charge is less than a first preset remaining charge threshold, the charging status of the energy storage inverter can also be obtained to determine the charging conditions of the energy storage inverter. If the energy storage inverter meets the charging conditions, the battery of the energy storage inverter can be charged. If the energy storage inverter does not meet the charging conditions, and the remaining battery charge is less than the first preset remaining charge threshold, in order to reduce the energy consumption of the battery and preserve a certain amount of emergency energy, it is necessary to switch the battery from the operating mode to the standby mode.

[0071] Step S205: the energy storage inverter maintains the operating mode.

[0072] In the operation mode, the battery corresponding to the energy storage inverter supplies power to the load. At this time, if the energy storage inverter meets the charging status, the battery needs to be charged in time.

[0073] Step S206 , switching the energy storage inverter from the operating mode to the standby mode. In the standby mode, the AC grid supplies power to the load, and the DC bus capacitor in the energy storage inverter is connected to the AC grid via a grid-connected relay to store electricity in the DC bus capacitor.

[0074] In the standby mode provided by the embodiment of the present invention, all switching devices in the energy storage inverter stop operating, the battery is turned off, and the AC power grid provides the mains electricity to the load directly to meet the load's power demand; on the other hand, the AC power grid provides the mains electricity through an uncontrolled rectifier circuit (wherein the uncontrolled rectifier circuit is a rectifier circuit composed of rectifier diodes without control function) and the DC bus capacitor of the energy storage inverter. This maintains a high voltage on the DC bus capacitor and stores electricity in the DC bus capacitor. In standby mode, the battery remains off and maintains a certain amount of emergency energy. Even if the AC power grid is cut off, the electricity stored in the DC bus capacitor can be used to power the control system in a timely manner to wake up the battery through the control system and continue to supply power to the load through the emergency electricity in the battery, thereby ensuring the load's power demand and improving the standby control effect of the energy storage inverter.

[0075] Step S207: Acquire the power supply status of the AC grid. If the AC grid cannot supply power to the load, disconnect the grid-connected relay, use the power stored in the DC bus capacitor to power the control system, and obtain the current remaining power of the battery. If the current remaining power is greater than a second preset remaining power threshold, switch the energy storage inverter from standby mode to operating mode, wake up the battery, close the grid-connected relay, and supply power to the load through the battery. If the current remaining power is less than the second preset remaining power threshold, do not wake up the startup battery to supply power to the load.

[0076] Through the above settings, since in standby mode, the AC power grid not only supplies power to the load, but is also connected to the DC side bus capacitor through the grid-connected relay, so that a certain amount of electricity is stored in the DC side bus capacitor. When the AC power grid encounters a power outage or failure, the electricity stored in the DC side bus capacitor can be used to maintain the control system to continue operating for a certain period of time. During the discharge process of the DC side bus capacitor, the control system needs to determine whether to wake up the battery based on the remaining power of the battery. If the remaining power of the battery is greater than the second preset threshold of the remaining power, it means that the power in the battery can supply power to the load. At this time, the control system will wake up the battery in time and supply power to the load through the emergency power in the battery to ensure the user's electricity needs. If the remaining power of the battery is less than the second preset threshold of the remaining power, it means that the power in the battery cannot support the continued operation of the load, and the battery remains in the off state.

[0077] In some embodiments, in standby mode, the above method further includes: determining whether the photovoltaic component meets the power generation conditions, and if so, supplying power to the load through the photovoltaic component, and charging the battery through the photovoltaic component when the load power supply conditions are met; if not, the battery remains in the off state.

[0078] The economy of photovoltaic panel power supply is better than that of AC grid power supply. In standby mode, the photovoltaic panel can be tested to determine whether it meets the power generation conditions. When the photovoltaic panel is able to generate electricity, it can directly supply power to the load through the photovoltaic panel, and charge the battery when the load power supply is met.

[0079] In some embodiments, in standby mode, if the photovoltaic assembly does not meet the power generation conditions, the method further includes: obtaining a charging status of the energy storage inverter, and if the charging status indicates that the energy storage inverter meets the charging conditions, waking up the battery for charging.

[0080] In some embodiments, to ensure economical power supply, it is also necessary to promptly obtain the charging status of the energy storage inverter so that the battery can be charged in a timely manner. The charging status includes a charging connection status and a charging time period. If the charging status indicates that the energy storage inverter meets the charging conditions, the step of waking up the battery for charging includes: obtaining the current remaining power of the battery; if the current remaining power of the battery is greater than a second preset remaining power threshold, waking up the battery for charging if all charging conditions meet the charging conditions; if the current remaining power of the battery is less than or equal to the second preset remaining power threshold, waking up the battery for charging if the charging connection status meets the charging conditions.

[0081] The charging connection status provided in the embodiment of the present invention includes whether the energy storage inverter is connected to the AC power grid; the charging time period refers to a preset time period for charging the battery corresponding to the energy storage inverter through the AC power grid.

[0082] The above steps provide a scenario for waking up the battery for charging in standby mode, that is, based on the current remaining power of the battery, if the current remaining power of the battery is large (meaning the current remaining power is greater than a second preset remaining power threshold), charging can be performed after a preset charging time period is met. If the remaining power of the battery is small (meaning the current remaining power is less than a second preset remaining power threshold), in order to ensure battery performance and avoid the risk of power loss, the charging time period does not need to be considered, and the battery can be woken up for charging as long as the charging connection state is met.

[0083] The standby control method for the energy storage inverter provided in the embodiment of the present invention obtains the remaining power of the battery corresponding to the energy storage inverter in the operating mode and a first preset remaining power threshold; determines whether the remaining power is less than the first preset remaining power threshold, and if the remaining power is less than the first preset remaining power threshold, obtains the charging status of the energy storage inverter and determines whether the energy storage inverter meets the charging conditions based on the charging status. If the charging conditions are met, the operating mode of the energy storage inverter is maintained and the battery is charged; if the charging conditions are not met, the energy storage inverter is switched from the operating mode to the standby mode. In standby mode, power is supplied to the load through the AC grid, and the DC side bus capacitor in the energy storage inverter is connected to the AC grid through a grid-connected relay to store electricity in the DC side bus capacitor; at the same time, if the AC grid cannot supply power to the DC side bus capacitor of the energy storage inverter, the grid-connected relay is disconnected, and the electricity stored in the DC side bus capacitor is used to power the control system, and the current remaining power of the battery is obtained. If the current remaining power is greater than the second preset remaining power threshold, the battery is awakened and the grid-connected relay is closed to supply power to the load through the battery; if the current remaining power is less than or equal to the second remaining power threshold, the battery is not awakened to supply power to the load. This technical means overcomes the large power supply loss in the related art. , poor economy during power supply, and difficulty in meeting the emergency power demand of the load due to the inability of the battery to start in time when the power grid fails. When photovoltaic power cannot supply power and the remaining power of the battery is insufficient, the energy storage inverter is not shut down, but the energy storage inverter is switched to standby mode, the battery is shut down, and the AC power grid is used to power the load and the DC side bus capacitor. When the AC power grid encounters a power outage, the power in the DC side bus capacitor can be used to wake up the battery in time. In the standby mode provided by the embodiment of the present invention, the emergency energy of the battery is guaranteed, the standby power loss is reduced, and the battery can be woken up in time when the power grid cannot supply power to ensure the emergency power demand of the load, thereby expanding the applicable scenarios of the energy storage inverter.

[0084] Based on the above-mentioned standby control method of the energy storage inverter provided by the embodiment of the present invention, the embodiment of the present invention further provides a standby control system of the energy storage inverter, which is applied to perform standby control on the energy storage inverter. As shown in FIG3 , the standby control system 300 of the energy storage inverter includes:

[0085] The standby mode switching unit 301 is used to obtain the remaining power of the battery corresponding to the energy storage inverter in the operating mode, and determine whether to switch the energy storage inverter to the standby mode according to the remaining power; wherein, the battery corresponding to the energy storage inverter in the operating mode is in the starting state, and the battery corresponding to the energy storage inverter in the standby mode is in the off state.

[0086] The connection relationship between the standby control system of the energy storage inverter provided by the embodiment of the present invention, the energy storage inverter, and the battery is shown in Figure 4. The energy storage inverter is respectively connected to the photovoltaic module A1, the battery A8, the AC grid A6, and the load. The control system communicates internally with the battery to obtain the remaining battery power and determine whether the energy storage inverter should switch modes. If the energy storage inverter is switched from operating mode to standby mode, the energy storage inverter does not need to be completely shut down. Instead, the switching devices in the energy storage inverter only need to be stopped and the battery shut down to reduce battery energy consumption and maintain a certain amount of emergency energy. The control system obtains power from the AC grid to maintain operation. At the same time, a DC bus capacitor is connected in parallel to the DC bus. The AC grid-provided mains power, while supplying power to the load, is connected to the DC bus capacitor A3 through the grid-connected relay A5, so that the DC bus capacitor maintains a high voltage and stores a certain amount of power. When the AC grid experiences a power outage, the grid-connected relay opens, disconnecting the AC grid from the energy storage inverter. The DC bus capacitor then discharges, continuing to power the control system and maintain its operation. The control system then determines whether to wake up the battery based on the battery's remaining charge. If battery A8 needs to be woken up, grid-connected relay A5 is closed, switching the grid-connected / off-grid switch, placing the energy storage inverter off-grid from the AC grid. The battery then supplies power to the load. This configuration ensures the load's power needs are met and improves the energy storage inverter's standby control effectiveness.

[0087] Through the above settings, when the photovoltaic components cannot supply power, the remaining power of the battery in the operating mode is obtained, and then it is determined whether to switch the energy storage inverter from the operating mode to the standby mode, thereby reducing power supply loss.

[0088] The standby control unit 302 is used to supply power to the load through the AC grid in standby mode, and the DC bus capacitor in the energy storage inverter is connected to the AC grid through a grid-connected relay to store electricity in the DC bus capacitor; when the AC grid cannot supply power to the load, the grid-connected relay is disconnected, and the control system is powered by the electricity stored in the DC bus capacitor, and then the control system determines whether to wake up the battery based on the remaining battery power.

[0089] Through the above settings, in standby mode, the battery is turned off and a certain amount of emergency energy is preserved. The DC side bus capacitor maintains a high voltage and stores a certain amount of electricity due to its connection to the AC grid through the grid-connected relay. Even if the mains power provided by the AC grid is cut off, the electricity stored in the DC side bus capacitor can be used in time to power the control system. The control system determines whether to wake up the battery based on the remaining power in the battery. If the current in the battery is sufficient, the energy in the battery can be used to meet the power demand of the load, thereby improving the standby control effect of the energy storage inverter.

[0090] In some embodiments, the standby mode switching unit 301 is further configured to: obtain a first preset threshold of remaining power, and determine whether the remaining power is less than the first preset threshold of remaining power; if the remaining power is less than the first preset threshold of remaining power, determine whether the photovoltaic module is in a power generation state; if the photovoltaic module is in a power generation state, the energy storage inverter remains in an operating mode; if the photovoltaic module is in a state where it cannot generate power, switch the energy storage inverter from the operating mode to the standby mode.

[0091] When the PV panels are capable of generating electricity, they can supply power to the load and charge the battery through the PV panels. In this case, there is no need to enter standby mode. Therefore, when the remaining battery charge is less than the first preset remaining charge threshold, the power generation status of the PV panels continues to be determined. When the PV panels are unable to generate electricity, the energy storage inverter switches from operating mode to standby mode.

[0092] In some embodiments, the first preset remaining power threshold can be set to 50% of the total power. That is, if the remaining power falls below 50% of the total power, the energy storage inverter will switch from operating mode to standby mode, allowing the remaining power in the battery to be used as an emergency energy backup. It should be noted that the above values ​​are only examples, and the first preset remaining power threshold can be set based on the actual battery conditions.

[0093] In some embodiments, if the remaining power of the battery is less than a first preset remaining power threshold and the photovoltaic component is unable to generate electricity, the above system also includes a charging status acquisition module, which is used to: obtain the charging status of the energy storage inverter; wherein the charging status includes the charging connection status and the charging time period; determine whether the energy storage inverter meets the charging conditions based on the charging status, and if the energy storage inverter does not meet the charging conditions, switch the energy storage inverter from the operating mode to the standby mode.

[0094] The charging connection status provided in the embodiment of the present invention includes whether the energy storage inverter is connected to the AC power grid; the charging time period refers to a preset time period for charging the battery corresponding to the energy storage inverter through the AC power grid.

[0095] Before switching the energy storage inverter from the running mode to the standby mode, the charging condition of the energy storage inverter can also be judged. If the energy storage inverter does not meet the charging condition and the remaining power of the battery is less than the first preset threshold of the remaining power, in order to reduce the energy consumption of the battery and save a certain amount of emergency energy, the battery needs to be switched from the running mode to the standby mode.

[0096] In some embodiments, the aforementioned charging conditions also include the presence of an irreversible fault in the energy storage inverter. Accordingly, failure to meet the charging conditions means that the AC grid is unable to charge the battery, the battery corresponding to the energy storage inverter is not within the set charging time period for the AC grid to charge the battery, or the energy storage inverter itself has an irreversible fault.

[0097] In some embodiments, when the AC power grid is unable to supply power to the load due to a fault or power outage, after disconnecting the grid-connected relay, the standby control unit 302 is further used to: obtain the current remaining power of the battery, and determine whether to wake up the battery based on the current remaining power; if the current remaining power is greater than a second preset threshold of remaining power, switch the energy storage inverter from standby mode to running mode, wake up the battery and close the grid-connected relay, and supply power to the load through the battery; if the current remaining power is less than or equal to the second preset threshold of remaining power, do not wake up the startup battery to supply power to the load.

[0098] When the photovoltaic module is unable to supply power and the remaining power of the battery does not meet the first preset threshold value of remaining power, the standby mode provided by the present application does not require the energy storage inverter to be completely shut down. It only needs to stop the switching devices in the energy storage inverter from operating, and the control system obtains power from the AC grid to maintain operation. At the same time, a DC-side bus capacitor is connected in parallel to the DC bus. While the AC power provided by the AC grid supplies power to the load, the AC power provided by the AC grid is connected to the DC-side bus capacitor of the energy storage inverter through an uncontrolled rectifier circuit, so that the DC-side bus capacitor maintains a higher voltage and stores power in the DC-side bus capacitor. When the AC power provided by the AC grid encounters a power outage, the grid-connected relay is disconnected, so that the connection between the AC grid and the energy storage inverter is completely disconnected. At this time, the DC-side bus capacitor discharges and continues to supply power to the control system to maintain the power consumption of the control system. The control system determines whether the battery needs to be woken up based on the current remaining power of the battery. The battery wake-up requirement is: when the remaining power in the battery is greater than the second preset remaining power threshold, that is, when there is still a certain amount of power in the battery, the energy storage inverter is woken up by the control system, and the grid-connected relay is controlled to close, and the grid-connected switch is switched to put the energy storage inverter and the grid in an off-grid state, and then the load is powered by the power in the battery, avoiding the direct shutdown of the energy storage inverter affecting the power demand of the load.

[0099] In some embodiments, in standby mode, the standby control unit 302 is further used to determine whether the photovoltaic component meets the power generation conditions. If so, the photovoltaic component supplies power to the load, and if the load power supply conditions are met, the photovoltaic component charges the battery; if not, the battery remains in the off state.

[0100] The economy of photovoltaic panel power supply is better than that of AC grid power supply. In standby mode, the photovoltaic panel can be tested to determine whether it meets the power generation conditions. When the photovoltaic panel is able to generate electricity, it can directly supply power to the load through the photovoltaic panel, and charge the battery when the load power supply is met.

[0101] In some embodiments, in standby mode, if the photovoltaic assembly does not meet the power generation conditions, the standby control unit 302 is further configured to obtain a charging status of the energy storage inverter, and if the charging status indicates that the energy storage inverter meets the charging conditions, wake up the battery for charging.

[0102] In some embodiments, the standby control unit 302 is further used to: obtain the current remaining power of the battery; if the current remaining power of the battery is greater than a second preset threshold value of the remaining power, then when all charging states meet the charging conditions, the battery is awakened for charging; if the current remaining power of the battery is less than or equal to the second preset threshold value of the remaining power, then when the charging connection state meets the charging conditions, the battery is awakened for charging.

[0103] Among them, the value of the second preset threshold of remaining power is less than the value of the first preset threshold of remaining power. The purpose of setting the preset threshold of the first preset threshold of remaining power is to determine whether to switch the energy storage inverter from the operating mode to the standby mode, reduce the energy consumption of the energy storage inverter, and maintain a certain emergency energy. The purpose of the second preset threshold of remaining power is to determine the conditions for waking up the battery for charging in the standby mode, in order to avoid damage to the battery and ensure the performance and service life of the battery. According to a specific embodiment of the embodiment of the present invention, the second preset threshold of remaining power can be set to 5% of the total power, that is, in the standby mode, if the current remaining power obtained is lower than 5% of the total power, it is not necessary to consider whether the charging time period is met. As long as the charging connection status is met, the energy storage inverter can be immediately woken up to charge the battery.

[0104] The above steps provide a scenario for waking up the battery for charging in standby mode, that is, based on the current remaining power of the battery, if the current remaining power of the battery is large (meaning the current remaining power is greater than the second preset remaining power threshold), charging can be performed after the preset charging time period is met. If the current remaining power of the battery is small (meaning the current remaining power is less than or equal to the second preset remaining power threshold), in order to ensure the battery performance and avoid the risk of power failure, the charging time period does not need to be considered. As long as the charging power supply status and charging connection status are met, the battery can be woken up for charging.

[0105] The standby control system of the energy storage inverter provided in the embodiment of the present invention determines whether to switch the energy storage inverter to the standby mode according to the remaining power by obtaining the remaining power of the battery corresponding to the energy storage inverter in the operating mode; wherein, the battery corresponding to the energy storage inverter in the operating mode is in the starting state, and the battery corresponding to the energy storage inverter in the standby mode is in the off state; in the standby mode, power is supplied to the load through the AC power grid, and the DC side bus capacitor in the energy storage inverter is connected to the AC power grid through the grid-connected relay to store power in the DC side bus capacitor; when the AC power grid cannot supply power to the load, the grid-connected relay is disconnected, and the power stored in the DC side bus capacitor is used to power the control system, and then the control system determines whether to wake up the battery according to the remaining power of the battery. The technical means overcomes the problems existing in the related technologies such as large power supply loss, poor economy during power supply, and difficulty in meeting the emergency power demand of the load due to the inability of the battery to start in time when the power grid fails. It is achieved that when the photovoltaic power supply cannot be supplied and the remaining power of the battery is insufficient, the energy storage inverter is not shut down, but the energy storage inverter is switched to standby mode, the battery is shut down, and the AC power grid is used to supply power to the load and the DC side bus capacitor. When the AC power grid encounters a power outage, the power in the DC side bus capacitor can be used to wake up the battery in time. In the standby mode provided by the embodiment of the present invention, the emergency energy of the battery is guaranteed, the standby power loss is reduced, and the battery can be woken up in time when the power grid cannot supply power to ensure the emergency power demand of the load, thereby expanding the applicable scenarios of the energy storage inverter.

[0106] An embodiment of the present invention further provides an electronic device, comprising: at least one processor; and a memory communicatively connected to the at least one processor. The memory stores a computer program executable by the at least one processor, wherein the computer program, when executed by the at least one processor, causes the electronic device to perform the method of an embodiment of the present invention.

[0107] An embodiment of the present invention further provides a non-transitory machine-readable medium storing a computer program, wherein the computer program, when executed by a processor of a computer, is used to cause the computer to perform the method of the embodiment of the present invention.

[0108] An embodiment of the present invention further provides a computer program product, including a computer program, wherein when the computer program is executed by a processor of a computer, it is used to enable the computer to perform the method of the embodiment of the present invention.

[0109] With reference to Figure 5, a block diagram of an electronic device that can be used as a server or client of an embodiment of the present invention will now be described, which is an example of a hardware device that can be applied to various aspects of the present invention. The electronic device is intended to represent various forms of digital electronic computer equipment, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0110] As shown in Figure 5, the electronic device includes a computing unit 501, which can perform various appropriate actions and processes according to a computer program stored in a read-only memory (ROM) 502 or a computer program loaded from a storage unit 508 into a random access memory (RAM) 503. In the RAM 503, various programs and data required for the operation of the electronic device can also be stored. The computing unit 501, ROM 502, and RAM 503 are connected to each other via a bus 504. An input / output (I / O) interface 505 is also connected to the bus 504.

[0111] Multiple components within the electronic device are connected to the I / O interface 505, including an input unit 506, an output unit 507, a storage unit 508, and a communication unit 509. The input unit 506 can be any type of device capable of inputting information into the electronic device. The input unit 506 can receive input numeric or character information and generate key signal inputs related to user settings and / or function control of the electronic device. The output unit 507 can be any type of device capable of presenting information and can include, but is not limited to, a display, a speaker, a video / audio output terminal, a vibrator, and / or a printer. The storage unit 508 can include, but is not limited to, a magnetic disk or an optical disk. The communication unit 509 allows the electronic device to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks, and can include, but is not limited to, a modem, a network card, an infrared communication device, a wireless communication transceiver, and / or a chipset, such as a Bluetooth device, a WiFi device, a WiMax device, a cellular communication device, and / or the like.

[0112] The computing unit 501 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the computing unit 501 include, but are not limited to, a CPU, a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various computing units that run machine learning model algorithms, digital signal processors (DSPs), and any appropriate processors, controllers, microcontrollers, etc. The computing unit 501 performs the various methods and processes described above. For example, in some embodiments, the method embodiments of the present invention may be implemented as a computer program, which is tangibly contained in a machine-readable medium, such as a storage unit 508. In some embodiments, part or all of the computer program may be loaded and / or installed on an electronic device via ROM 502 and / or communication unit 509. In some embodiments, the computing unit 501 may be configured to perform the above-described method in any other appropriate manner (e.g., by means of firmware).

[0113] The computer programs for implementing the methods of the embodiments of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor or controller of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer programs are executed by the processor or controller, the functions / operations specified in the flowcharts and / or block diagrams are implemented. The computer programs may be executed entirely on the machine, partially on the machine, as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0114] In the context of an embodiment of the present invention, a machine-readable medium can be a tangible medium that can contain or store a program for use by an instruction execution system, device or equipment or used in combination with an instruction execution system, device or equipment. A machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. A machine-readable signal medium can include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared or semiconductor system, device or equipment, or any suitable combination of the foregoing. A more specific example of a machine-readable storage medium can include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0115] It should be noted that the term "including" and its variations used in the embodiments of the present invention are open-ended, i.e., "including but not limited to." The term "based on" means "based at least in part on." The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; and the term "some embodiments" means "at least some embodiments." The modifications of "one" and "a plurality of" mentioned in the embodiments of the present invention are illustrative and non-restrictive. Those skilled in the art should understand that, unless the context clearly indicates otherwise, they should be understood as "one or more."

[0116] The various steps described in the method implementation scheme provided in the embodiments of the present invention may be performed in different orders and / or in parallel. In addition, the method implementation scheme may include additional steps and / or omit the steps shown. The scope of protection of the present invention is not limited in this respect.

[0117] The term "embodiment" in this specification refers to specific features, structures, or characteristics described in conjunction with the embodiment that can be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor does it mean that it is mutually exclusive with other embodiments and is independent or optional. The various embodiments in this specification are described in a related manner, and the same or similar parts between the various embodiments are referenced to each other. In particular, for the embodiments of the device, equipment, and system, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts are referred to the partial description of the method embodiment.

[0118] The above-described embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of the present invention. Therefore, the scope of the present invention shall be determined by the appended claims.

Claims

1. A standby control method for an energy storage inverter, characterized in that: include: Obtaining the remaining power of the battery corresponding to the energy storage inverter in the operation mode, and judging whether to switch the energy storage inverter to the standby mode according to the remaining power; wherein, in the operation mode, the battery corresponding to the energy storage inverter is in the start-up state, and in the standby mode, the battery corresponding to the energy storage inverter is in the off state; In the standby mode, the load is powered by the AC power grid, and the DC bus capacitor in the energy storage inverter is connected to the AC power grid via a grid-connected relay to store electricity in the DC bus capacitor. When the AC power grid cannot power the load, the grid-connected relay is disconnected, and the control system is powered by the electricity stored in the DC bus capacitor, and then the control system determines whether to wake up the battery based on the remaining power of the battery.

2. The method according to claim 1, characterized in that The step of judging whether to switch the energy storage inverter to the standby mode according to the remaining power includes: Obtaining a first preset remaining power threshold, and determining whether the remaining power is less than the first preset remaining power threshold; If the remaining power is less than the first remaining power preset threshold, it is determined whether the photovoltaic component is in a power generation state. If the photovoltaic component is in a power generation state, the energy storage inverter remains in an operating mode; if the photovoltaic component is in a state where it cannot generate power, the energy storage inverter is switched from an operating mode to a standby mode.

3. The method according to claim 2, characterized in that If the remaining power of the storage battery is less than the first preset remaining power threshold and the photovoltaic assembly is in a state where it cannot generate electricity, the method further includes: Obtaining the charging state of the energy storage inverter; wherein the charging state includes a charging connection state and a charging time period; It is determined whether the energy storage inverter meets the charging condition according to the charging state, and when the energy storage inverter does not meet the charging condition, the energy storage inverter is switched from the running mode to the standby mode.

4. The method according to claim 1, characterized in that When the AC power grid cannot supply power to the load and the grid-connected relay is disconnected, the method further includes: Obtain the current remaining power of the battery, and determine whether to wake up based on the current remaining power The battery; if the current remaining power is greater than a second preset remaining power threshold, the energy storage inverter is switched from standby mode to operating mode, the battery is awakened and the grid-connected relay is closed, and power is supplied to the load through the battery; if the current remaining power is less than or equal to the second remaining power threshold, the battery is not awakened and started to supply power to the load.

5. The method according to claim 1, characterized in that: In the standby mode, the method further includes: Determine whether the photovoltaic component meets the power generation conditions. If so, supply power to the load through the photovoltaic component, and charge the battery through the photovoltaic component when the load power supply is met; if not, the battery remains in a closed state.

6. The method according to claim 5, characterized in that In the standby mode, if the photovoltaic assembly does not meet the power generation condition, the method further includes: The charging status of the energy storage inverter is obtained, and if the charging status indicates that the energy storage inverter meets the charging condition, the storage battery is awakened for charging.

7. The method according to claim 6, characterized in that If the charging state indicates that the energy storage inverter meets the charging condition, the step of waking up the battery for charging includes: Acquire the current remaining power of the battery, and if the current remaining power of the battery is greater than a second preset remaining power threshold, wake up the battery for charging if all the charging states meet the charging conditions; If the current remaining power of the storage battery is less than or equal to a second preset remaining power threshold, then when the charging connection state meets the charging condition, the storage battery is awakened for charging.

8. A standby control system for an energy storage inverter, characterized in that: include: A standby mode switching unit, used to obtain the remaining power of the battery corresponding to the energy storage inverter in the running mode, and determine whether to switch the energy storage inverter to the standby mode according to the remaining power; wherein, in the running mode, the battery corresponding to the energy storage inverter supplies power to the load, and in the standby mode, the battery corresponding to the energy storage inverter is in a closed state; A standby control unit is used to supply power to the load through the AC power grid in the standby mode, and the DC side bus capacitor in the energy storage inverter is connected to the AC power grid through a grid-connected relay to store electricity in the DC side bus capacitor; when the AC power grid cannot supply power to the load, the grid-connected relay is disconnected, and the control system is powered by the electricity stored in the DC side bus capacitor, and then the control system determines whether to wake up the battery according to the remaining power of the battery.

9. An energy storage inverter, comprising: A processor, and a memory storing a program, wherein the program comprises instructions, which, when executed by the processor, cause the processor to perform the method according to any one of claims 1 to 7.

10. A non-transitory machine-readable medium storing computer instructions, characterized in that: The computer instructions are used to cause the computer to execute the method according to any one of claims 1-7.

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