A method, device and equipment for waking up an AC coupling light storage system

Abstract

This invention discloses a method, apparatus, and device for waking up an AC-coupled photovoltaic-storage system, belonging to the field of photovoltaic-storage systems. Considering that the AC bus voltage established by the photovoltaic inverter has the ability to wake up the energy storage inverter, in this application, the photovoltaic inverter can establish an AC bus voltage when the duration of no voltage on the AC bus of the AC-coupled photovoltaic-storage system reaches a first preset threshold. The energy storage inverter can then be woken up by the AC bus voltage, thereby determining whether the battery voltage meets the voltage requirements for building an AC microgrid. If it does, an AC microgrid can be built and the battery can be recharged. If it does not, it can operate in a power factor correction state to recharge the battery based on the AC power generated by the photovoltaic inverter. Due to the active wake-up of the photovoltaic inverter, even when both the energy storage inverter and the battery are in dormancy, the AC-coupled photovoltaic-storage system can be woken up without manual intervention, reducing labor costs and improving work efficiency.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic energy storage systems, and in particular to a method, apparatus, and device for waking up an AC-coupled photovoltaic energy storage system. Background Technology

[0002] In an AC-coupled photovoltaic-storage system, the photovoltaic inverter converts the DC power provided by the photovoltaic power generation system into AC power, and the energy storage inverter converts the DC power provided by the battery into AC power, which is then used to power the load through the AC bus. However, in off-grid scenarios, if the energy storage inverter consumes too little battery power when there is no photovoltaic power, the battery and the energy storage inverter may simultaneously go into hibernation. In this case, the AC-coupled photovoltaic-storage system cannot be woken up and requires staff intervention, which results in high labor costs and low work efficiency.

[0003] Therefore, how to provide a solution to the above-mentioned technical problems is a problem that needs to be solved by those skilled in the art. Summary of the Invention

[0004] The purpose of this invention is to provide a method, apparatus, and device for waking up an AC-coupled photovoltaic-storage system. Considering that the AC bus voltage established by the photovoltaic inverter has the ability to wake up the energy storage inverter, in this application, the photovoltaic inverter can establish an AC bus voltage when the duration of no voltage on the AC bus of the AC-coupled photovoltaic-storage system reaches a first preset threshold. The energy storage inverter can then be woken up by the AC bus voltage. It can then determine whether the battery voltage meets the voltage requirements for building an AC microgrid. If it does, an AC microgrid can be built and the battery can be recharged. If it does not, it can operate in a power factor correction state so that the battery can be recharged based on the AC power generated by the photovoltaic inverter. Due to the active wake-up of the photovoltaic inverter, even when both the energy storage inverter and the battery are in a dormant state, the AC-coupled photovoltaic-storage system can be woken up without human intervention, reducing labor costs and improving work efficiency.

[0005] To address the aforementioned technical problems, this invention provides a wake-up method for an AC-coupled photovoltaic-storage system, applied to the energy storage inverter within the AC-coupled photovoltaic-storage system, comprising: The battery is awakened after being awakened by the AC bus voltage, and it is determined whether the battery voltage meets the voltage requirements for the construction of the AC microgrid. The process of establishing the AC bus voltage of the energy storage inverter includes: when the duration of no voltage on the AC bus of the AC coupled photovoltaic-energy storage system reaches a first preset threshold, the photovoltaic inverter converts the DC power generated by the photovoltaic power generation system into AC power and provides it to the AC bus. If the conditions are met, an AC microgrid will be constructed and the battery will be recharged; If the conditions are not met, it will operate in power factor correction mode so that the battery can be recharged by the AC power generated by the photovoltaic inverter.

[0006] On the other hand, the step of waking up the battery after being awakened by the AC bus voltage and determining whether the battery voltage meets the voltage requirements for constructing the AC microgrid includes: After being awakened by the AC bus voltage, the photovoltaic energy management unit determines whether the total power generation of the photovoltaic power generation system is greater than the self-consumption power of the energy storage inverter. If the voltage is greater than the required voltage for building an AC microgrid, the battery is activated and it is determined whether the battery voltage meets the voltage requirements for building an AC microgrid. If the value is not greater than the value, the system operates in power factor correction mode to replenish the battery with AC power generated by the photovoltaic inverter.

[0007] On the other hand, the AC-coupled photovoltaic-storage system has multiple photovoltaic inverters, one of which acts as a proxy inverter; The process of establishing the AC bus voltage of the energy storage inverter includes: when the duration of no voltage on the AC bus of the AC coupled photovoltaic energy storage system reaches a first preset threshold, the proxy inverter constructs a frequency-biased AC microgrid on the AC bus based on the DC power generated by the photovoltaic power generation system to avoid triggering the start-up of other photovoltaic inverters except the proxy inverter. After being awakened by the AC bus voltage, the photovoltaic energy management unit determines whether the total power generation of the photovoltaic power generation system is greater than the self-consumption power of the energy storage inverter, including: After being awakened by the AC bus voltage, it receives the photovoltaic energy management unit's judgment result on the total photovoltaic power generation. The process by which the photovoltaic energy management unit determines the total photovoltaic power generation includes: Based on the current environmental parameters and the voltage values ​​of the photovoltaic modules corresponding to the proxy inverter, the total power generation of the photovoltaic power generation system is evaluated and determined. Determine whether the assessed value of the total power generation is greater than the self-consumption power of the energy storage inverter, and obtain the determination result.

[0008] On the other hand, after constructing the AC microgrid and recharging the battery, the wake-up method of the AC-coupled photovoltaic energy storage system further includes: The photovoltaic energy management unit determines whether the actual value of the total power generation of the photovoltaic power generation system is greater than the self-consumption power of the energy storage inverter. If it is greater than that, then continue to build the communication micro-network; If the value is not greater than the specified value, the construction of the AC microgrid will stop and the system will enter a dormant state.

[0009] On the other hand, the assessment value for determining the total power generation of the photovoltaic power generation system based on current environmental parameters and the voltage value of the photovoltaic modules corresponding to the proxy inverter includes: Determine the current environmental parameters and the voltage values ​​of the photovoltaic modules corresponding to the proxy inverter; Input the current environmental parameters and the voltage values ​​of the photovoltaic modules corresponding to the proxy inverter into the pre-trained power evaluation model to obtain the evaluation value of the total power generation of the photovoltaic power generation system output by the power evaluation model.

[0010] On the other hand, the election process for the proxy inverter includes: Every preset period, the photovoltaic energy management unit evaluates the power generation stability of each photovoltaic inverter based on a pre-trained stability assessment model and the historical power generation data of the photovoltaic modules corresponding to each photovoltaic inverter. The photovoltaic inverter with the highest power generation stability is used as the proxy inverter.

[0011] On the other hand, the wake-up method of the AC-coupled optical storage system also includes: At the preset wake-up time, a communication micronetwork is constructed; The photovoltaic energy management unit determines whether the actual value of the total power generation of the photovoltaic power generation system is greater than the self-consumption power of the energy storage inverter. If it is greater than that, then continue to build the communication micro-network; If the value is not greater than the specified value, the construction of the AC microgrid will stop and the system will enter a dormant state.

[0012] On the other hand, the process of determining the wake-up time includes: The energy storage inverter determines the day's forecast sunshine, environmental parameters, and historical wake-up times; The energy storage inverter takes the day's sunshine forecast, environmental parameters, and historical wake-up times as input data and inputs them into a pre-trained wake-up optimization model to obtain the wake-up time for the day.

[0013] To address the aforementioned technical problems, the present invention also provides a wake-up device for an AC-coupled photovoltaic-storage system, applied to the energy storage inverter in the AC-coupled photovoltaic-storage system, comprising: The judgment module is used to wake up the battery after being woken up by the AC bus voltage and to determine whether the battery voltage meets the voltage requirements for the construction of the AC microgrid. If it does, the construction module is triggered; if it does not, the power replenishment module is triggered. The process of establishing the AC bus voltage of the energy storage inverter includes: when the duration of no voltage on the AC bus of the AC coupled photovoltaic-energy storage system reaches a first preset threshold, the photovoltaic inverter converts the DC power generated by the photovoltaic power generation system into AC power and provides it to the AC bus. Modules for building AC microgrids and charging batteries; The power replenishment module is used to operate in power factor correction mode so as to replenish the battery with AC power generated by the photovoltaic inverter.

[0014] To address the aforementioned technical problems, the present invention also provides a wake-up device for an AC-coupled optical storage system, comprising: Memory, used to store computer programs; A processor is used to execute the computer program to implement the wake-up method of the AC-coupled optical storage system as described above.

[0015] Beneficial Effects: This invention provides a wake-up method for an AC-coupled photovoltaic-storage system. Considering that the AC bus voltage established by the photovoltaic inverter has the ability to wake up the energy storage inverter, in this application, the photovoltaic inverter can establish an AC bus voltage when the duration of no voltage on the AC bus of the AC-coupled photovoltaic-storage system reaches a first preset threshold. The energy storage inverter can then be woken up by the AC bus voltage, thereby determining whether the battery voltage meets the voltage requirements for building an AC microgrid. If it does, an AC microgrid can be built and the battery can be recharged. If it does not, it can operate in a power factor correction state to recharge the battery based on the AC power generated by the photovoltaic inverter. Due to the active wake-up of the photovoltaic inverter, even when both the energy storage inverter and the battery are in a dormant state, the AC-coupled photovoltaic-storage system can be woken up without manual intervention, reducing labor costs and improving work efficiency.

[0016] The present invention also provides a wake-up device and apparatus for an AC-coupled optical storage system, which has the same beneficial effects as the wake-up method for the AC-coupled optical storage system described above. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the relevant technologies and the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 The first flowchart of the wake-up method for the AC-coupled optical storage system provided by the present invention is shown. Figure 2 This is a schematic diagram of an AC-coupled photovoltaic energy storage system. Figure 3 The second flowchart illustrates the wake-up method for the AC-coupled optical storage system provided by the present invention. Figure 4 The third flowchart illustrates the wake-up method for the AC-coupled optical storage system provided by this invention. Figure 5 A schematic diagram of the wake-up device for the AC-coupled optical storage system provided by the present invention; Figure 6This is a schematic diagram of the wake-up device of the AC-coupled optical storage system provided by the present invention. Detailed Implementation

[0019] The core of this invention is to provide a method, apparatus, and device for waking up an AC-coupled photovoltaic-storage system. Considering that the AC bus voltage established by the photovoltaic inverter has the ability to wake up the energy storage inverter, in this application, the photovoltaic inverter can establish an AC bus voltage when the duration of no voltage on the AC bus of the AC-coupled photovoltaic-storage system reaches a first preset threshold. The energy storage inverter can then be woken up by the AC bus voltage. It can then determine whether the battery voltage meets the voltage requirements for building an AC microgrid. If it does, an AC microgrid can be built and the battery can be recharged. If it does not, it can operate in a power factor correction state so that the battery can be recharged based on the AC power generated by the photovoltaic inverter. Due to the active wake-up of the photovoltaic inverter, even when both the energy storage inverter and the battery are in a dormant state, the AC-coupled photovoltaic-storage system can be woken up without human intervention, reducing labor costs and improving work efficiency.

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please refer to Figure 1 , Figure 1 This is a first flowchart illustrating the wake-up method for an AC-coupled photovoltaic (PV) energy storage system provided by the present invention. The wake-up method is applied to the energy storage inverter within the AC-coupled PV energy storage system and includes: S101: After being awakened by the AC bus voltage, the battery is awakened and it is determined whether the battery voltage meets the voltage requirements for the construction of the AC microgrid. The process of establishing the AC bus voltage of the energy storage inverter includes: when the duration of no voltage on the AC bus of the AC coupled photovoltaic-energy storage system reaches a first preset threshold, the photovoltaic inverter converts the DC power generated by the photovoltaic power generation system into AC power and provides it to the AC bus. Specifically, the AC-coupled photovoltaic-storage system will be introduced first. It includes a photovoltaic power generation system and an energy storage system. The photovoltaic power generation system may include one or more photovoltaic relays and their corresponding photovoltaic components, as well as a photovoltaic energy management unit. The photovoltaic components can use sunlight energy to generate direct current. The photovoltaic energy management unit can monitor and manage the data of the photovoltaic components and photovoltaic relays. The energy storage system includes batteries and energy storage relays. The energy storage relays can invert the direct current of the battery into alternating current to build an AC microgrid.

[0022] Specifically, considering the technical problems mentioned above, and taking into account that the AC bus voltage established by the photovoltaic inverter has the ability to wake up the energy storage inverter, and that in the case of "both the energy storage inverter and the battery are in sleep mode", the photovoltaic inverter cannot work with the AC microgrid built by the energy storage inverter, so the AC bus is always in a state of no voltage. Therefore, in this embodiment of the invention, when the duration of no voltage on the AC bus reaches a first preset threshold, the photovoltaic inverter converts the DC power generated by the photovoltaic power generation system into AC power and provides it to the AC bus, that is, it builds an AC bus voltage to wake up the energy storage inverter. The main function of the energy storage inverter is to build an AC microgrid based on battery energy. Therefore, the energy storage inverter can wake up the battery after being woken up by the AC bus voltage and determine whether the battery voltage meets the voltage requirements for building the AC microgrid in order to trigger subsequent actions.

[0023] In this step, the energy storage inverter needs a certain amount of power from the battery to build an AC microgrid. Therefore, after waking up the battery, the energy storage inverter can determine whether the battery voltage meets the voltage requirements for building the AC microgrid.

[0024] S102: If satisfied, construct an AC microgrid and recharge the battery; Specifically, if the conditions are met, an AC microgrid can be constructed, and the AC power generated by the photovoltaic inverter can be used to replenish the battery. Thus, while constructing the AC microgrid, the battery can be quickly replenished to prevent it from entering a dormant state again due to insufficient power.

[0025] S103: If not satisfied, it operates in power factor correction mode so that the battery can be recharged based on the AC power generated by the photovoltaic inverter.

[0026] Specifically, even if the battery voltage does not meet the voltage requirements for building an AC microgrid, and no AC microgrid is built, the energy storage inverter can still operate in PFC (Power Factor Correction) mode to rectify the AC power on the AC bus into DC power to provide constant current charging for the battery.

[0027] In summary, the embodiments of the present invention can realize the autonomous wake-up of AC-coupled photovoltaic energy storage systems without human intervention, reducing manpower input and improving wake-up efficiency; differentiated power replenishment and grid construction strategies are set according to whether the battery voltage meets the requirements for AC microgrid construction, and effective power replenishment can still be achieved when the battery voltage does not meet the requirements, laying the battery voltage foundation for subsequent AC microgrid construction.

[0028] This invention provides a wake-up method for an AC-coupled photovoltaic-storage system. Considering that the AC bus voltage established by the photovoltaic inverter has the ability to wake up the energy storage inverter, in this application, the photovoltaic inverter can establish an AC bus voltage when the duration of no voltage on the AC bus of the AC-coupled photovoltaic-storage system reaches a first preset threshold. The energy storage inverter can then be woken up by the AC bus voltage. It can then determine whether the battery voltage meets the voltage requirements for building an AC microgrid. If it does, an AC microgrid can be built and the battery can be recharged. If it does not, it can operate in a power factor correction state so that the battery can be recharged based on the AC power generated by the photovoltaic inverter. Due to the active wake-up of the photovoltaic inverter, even when both the energy storage inverter and the battery are in a dormant state, the AC-coupled photovoltaic-storage system can be woken up without manual intervention, reducing labor costs and improving work efficiency.

[0029] Based on the above embodiments: As an optional embodiment, waking up the battery after being awakened by the AC bus voltage and determining whether the battery voltage meets the voltage requirements for constructing the AC microgrid includes: S201: After being awakened by the AC bus voltage, the photovoltaic energy management unit determines whether the total power generation of the photovoltaic power generation system is greater than the self-consumption power of the energy storage inverter. S202: If it is greater than, wake up the battery and determine whether the battery voltage meets the voltage requirements for building the AC microgrid. S203: If not greater than, it operates in power factor correction mode so that the battery can be recharged based on the AC power generated by the photovoltaic inverter.

[0030] Specifically, for a better explanation of the embodiments of the present invention, please refer to... Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of an AC-coupled photovoltaic-storage system. The photovoltaic energy management unit can uniformly manage all photovoltaic inverters (photovoltaic inverter 1, photovoltaic inverter 2 to photovoltaic inverter n), and the photovoltaic energy management unit can communicate with the energy storage inverter. Figure 3 This is the second flowchart illustrating the wake-up method for the AC-coupled optical storage system provided by the present invention. Figure 3 In this case, S204 is the same as S102 above, and S205 is the same as S103 above.

[0031] Specifically, considering the self-consumption power of the energy storage inverter, if the total power generation of the photovoltaic power generation system is less than this self-consumption power, the battery will be continuously consumed by the energy storage inverter after being woken up, resulting in power loss. Therefore, this embodiment of the invention can add a judgment step on the total photovoltaic power generation before waking up the battery. That is, after being woken up by the AC bus voltage, the photovoltaic energy management unit determines whether the total power generation of the photovoltaic power generation system is greater than the self-consumption power of the energy storage inverter. If it is greater, the battery can be woken up, and it is determined whether the battery voltage meets the voltage requirements for the construction of the AC microgrid. If it is not greater, there is no need to wake up the battery, and it can directly work in the power factor correction state so as to replenish the battery with AC power generated by the photovoltaic inverter. This avoids the ineffective loss of battery voltage due to insufficient photovoltaic power and improves the wake-up efficiency of the AC coupled photovoltaic-energy storage system.

[0032] As an optional embodiment, the AC-coupled photovoltaic-storage system has multiple photovoltaic inverters, one of which acts as a proxy inverter; The process of establishing the AC bus voltage of the energy storage inverter includes: when the duration of no voltage on the AC bus of the AC coupled photovoltaic energy storage system reaches a first preset threshold, the proxy inverter constructs a frequency-biased AC microgrid on the AC bus based on the DC power generated by the photovoltaic power generation system to avoid triggering the start-up of other photovoltaic inverters except the proxy inverter. After being awakened by the AC bus voltage, the photovoltaic energy management unit determines whether the total power generation of the photovoltaic power generation system is greater than the self-consumption power of the energy storage inverter, including: After being awakened by the AC bus voltage, it receives the photovoltaic energy management unit's judgment result on the total photovoltaic power generation. The process by which the photovoltaic energy management unit determines the total photovoltaic power generation includes: Based on the current environmental parameters and the voltage values ​​of the photovoltaic modules corresponding to the proxy inverter, the total power generation of the photovoltaic power generation system is evaluated and determined. Determine whether the assessed value of the total power generation is greater than the self-consumption power of the energy storage inverter, and obtain the determination result.

[0033] Specifically, considering that there are multiple photovoltaic inverters in the system (AC-coupled photovoltaic-storage system), the power generation stability of the photovoltaic modules of multiple photovoltaic inverters is different. If multiple photovoltaic inverters start up at the same time, the stability of "AC bus voltage construction" will be reduced because each photovoltaic inverter will increase the overall power consumption of the photovoltaic power generation system. Therefore, in order to improve the stability of "AC bus voltage construction", in this embodiment of the invention, one of the photovoltaic inverters can be selected as a proxy inverter to construct the AC bus voltage, so as to wake up the energy storage inverter and the photovoltaic energy management unit.

[0034] Since the photovoltaic inverters other than the proxy inverter are not working, the photovoltaic energy management unit cannot directly determine the total power generation of the photovoltaic power generation system. However, theoretically, the total power generation of the photovoltaic power generation system can be evaluated and determined based on the current environmental parameters and the voltage value of the photovoltaic module corresponding to the proxy inverter. Therefore, in this embodiment of the invention, the photovoltaic energy management unit can evaluate and determine the total power generation of the photovoltaic power generation system based on the current environmental parameters and the voltage value of the photovoltaic module corresponding to the proxy inverter; determine whether the evaluated total power generation is greater than the self-consumption power of the energy storage inverter, and obtain the judgment result. Finally, the energy storage inverter can perform subsequent actions based on the judgment result.

[0035] As an optional embodiment, after constructing an AC microgrid and recharging the battery, the wake-up method for the AC-coupled photovoltaic-storage system further includes: S206: Determine whether the actual value of the total power generation of the photovoltaic power generation system is greater than the self-consumption power of the energy storage inverter through the photovoltaic energy management unit; S207: If it is greater than, then continue to build the communication micronetwork; S208: If not greater than, stop building the AC microgrid and enter a dormant state.

[0036] Specifically, considering that after the AC microgrid is constructed, each photovoltaic inverter can start up along with the AC microgrid, the photovoltaic energy management unit can determine the power generation of each photovoltaic inverter, thereby determining the actual value of the total power generation of the entire photovoltaic power generation system. Therefore, in this embodiment of the invention, after the AC microgrid is constructed and the battery is recharged, the photovoltaic energy management unit can determine whether the actual value of the total power generation of the photovoltaic power generation system is greater than the self-consumption power of the energy storage inverter. If it is greater, the AC microgrid construction continues; if it is not greater, the AC microgrid construction stops and the system enters a dormant state. Based on the actual value of the total power generation, it is determined whether the battery's electrical energy will be consumed (i.e., whether the actual value of the total power generation is greater than the self-consumption power of the energy storage inverter). If the battery's electrical energy is consumed, the AC microgrid construction can be stopped and the system enters a dormant state to save battery energy.

[0037] As an optional embodiment, the total power generation of the photovoltaic power generation system is evaluated and determined based on current environmental parameters and the voltage values ​​of the photovoltaic modules corresponding to the proxy inverter, including: Determine the current environmental parameters and the voltage values ​​of the photovoltaic modules corresponding to the proxy inverter; Input the current environmental parameters and the voltage values ​​of the photovoltaic modules corresponding to the proxy inverter into the pre-trained power evaluation model to obtain the evaluation value of the total power generation of the photovoltaic power generation system output by the power evaluation model.

[0038] Specifically, considering that the total power generation of a photovoltaic power generation system can be efficiently and accurately determined through a neural network model, a power evaluation model is pre-trained in this embodiment of the invention. The current environmental parameters and the voltage values ​​of the photovoltaic modules corresponding to the proxy inverter can be input into the pre-trained power evaluation model to obtain the total power generation of the photovoltaic power generation system output by the power evaluation model, thereby obtaining the total power generation evaluation value of the photovoltaic power generation system efficiently and accurately.

[0039] The current environmental parameters can include various types, such as sunlight conditions, temperature and humidity values, etc., which are not limited in this embodiment of the invention.

[0040] Of course, in addition to the power assessment model, other methods can be used to determine the total power generation of a photovoltaic power generation system based on current environmental parameters and the voltage values ​​of the photovoltaic modules corresponding to the proxy inverter, such as genetic algorithms. This embodiment of the invention does not limit these methods.

[0041] As an optional embodiment, the election process for the proxy inverter includes: Every preset period, the photovoltaic energy management unit evaluates the power generation stability of each photovoltaic inverter based on a pre-trained stability assessment model and the historical power generation data of the photovoltaic modules corresponding to each photovoltaic inverter. The photovoltaic inverter with the highest power generation stability is used as the proxy inverter.

[0042] Specifically, considering that using the photovoltaic inverter with the highest power generation stability as a proxy inverter can increase the probability of the proxy inverter successfully waking up the AC-coupled photovoltaic-storage system, and considering that the power generation stability of each photovoltaic inverter can be efficiently and accurately evaluated through a neural network model, in this embodiment of the invention, the photovoltaic energy management unit can evaluate the power generation stability of each photovoltaic inverter every preset period based on a pre-trained stability evaluation model and the historical power generation data of the photovoltaic modules corresponding to each photovoltaic inverter, and then use the photovoltaic inverter with the highest power generation stability as the proxy inverter.

[0043] The historical power generation data may include multiple items, such as daily power generation, daily power generation start time, and photovoltaic module voltage, etc., which are not limited in this embodiment of the invention.

[0044] In addition, it is worth mentioning that multiple photovoltaic inverters can be selected as proxy inverters in order of power generation stability from high to low, so as to establish AC bus voltage based on multiple proxy inverters, thereby improving the stability of the constructed AC bus voltage and increasing the system wake-up success rate.

[0045] Of course, in addition to this specific method, other types of methods can be used to evaluate the power generation stability of each photovoltaic inverter, such as genetic algorithms, etc., which are not limited to this embodiment of the invention.

[0046] As an optional embodiment, the wake-up method for the AC-coupled optical storage system further includes: S301: Construct an interactive microgrid at a preset wake-up time. Specifically, for a better explanation of the embodiments of the present invention, please refer to... Figure 4 , Figure 4 The third flowchart illustrates the wake-up method for the AC-coupled photovoltaic-storage system provided by this invention. Considering that when the battery is not in sleep mode and the energy storage inverter is in sleep mode, the energy storage inverter can be woken up based on the battery power. However, the photovoltaic power generation capacity varies at different times. Therefore, in this embodiment of the invention, the energy storage inverter can first construct an AC microgrid at a preset wake-up time point so that the system can be woken up to work when the photovoltaic power generation is reliable.

[0047] S302: The photovoltaic energy management unit determines whether the actual value of the total power generation of the photovoltaic power generation system is greater than the self-consumption power of the energy storage inverter. Specifically, after the construction of the AC microgrid, since each photovoltaic inverter in the photovoltaic power generation system can start up with the grid, in this embodiment of the invention, the energy storage inverter can determine whether the actual value of the total power generation of the photovoltaic power generation system is greater than the self-consumption power of the energy storage inverter through the photovoltaic energy management unit, so as to determine whether the photovoltaic power generation system can meet the self-consumption power of the energy storage inverter, so as to prevent the energy storage inverter from continuing to consume battery power, and trigger subsequent steps based on the judgment result.

[0048] Alternatively, as an optional embodiment, determining whether the actual value of the total power generation of the photovoltaic power generation system is greater than the self-consumption power of the energy storage inverter may include: The system determines whether the duration for which the actual total power output of the photovoltaic power generation system exceeds the self-consumption power of the energy storage inverter exceeds a preset duration. If it does, the system determines that the actual total power output of the photovoltaic power generation system is greater than the self-consumption power of the energy storage inverter. If it does not, the system determines that the actual total power output of the photovoltaic power generation system is not greater than the self-consumption power of the energy storage inverter.

[0049] Specifically, limiting the time frame can improve the reliability of the judgment results and eliminate interference from power fluctuations.

[0050] S303: If it is greater than, then continue to build the communication microgrid; S304: If not greater than, stop building the AC microgrid and enter a dormant state.

[0051] Specifically, if the actual value of the total power generation is greater than the self-consumption power of the energy storage inverter, it means that the self-consumption power of the energy storage inverter can be met, and thus the AC microgrid can be continuously built. If it is not greater than the actual value, it means that the operation of the energy storage inverter will consume battery power, eventually leading to battery hibernation. Therefore, in this case, the energy storage inverter can stop building the AC microgrid and enter hibernation state.

[0052] As an optional embodiment, the process of determining the wake-up time point includes: The energy storage inverter determines the day's forecast sunshine, environmental parameters, and historical wake-up times; The energy storage inverter takes the day's sunshine forecast, environmental parameters, and historical wake-up times as input data and inputs them into a pre-trained wake-up optimization model to obtain the wake-up time for the day.

[0053] Specifically, considering that the suitable wake-up time for the day can be efficiently and accurately determined by using a neural network model, the day's sunshine forecast, environmental parameters, and historical wake-up time points, so as to wake up the system when the photovoltaic power generation system is generating electricity reliably; therefore, in this embodiment of the invention, the energy storage inverter can use the day's sunshine forecast, environmental parameters, and historical wake-up time points as input data to input into a pre-trained wake-up optimization model to obtain the wake-up time point for the day. The goal of this wake-up optimization model is to determine the recommended time point during the day when the photovoltaic power generation system can generate electricity stably.

[0054] Of course, in addition to this method, the process of determining the wake-up time point can also be of other types. For example, it can be determined by genetic algorithm based on the day's light forecast value, environmental parameters and historical wake-up time points, or it can be set manually. This embodiment of the invention does not limit the specific methods.

[0055] Please refer to Figure 5 , Figure 5 This invention also provides a schematic diagram of a wake-up device for an AC-coupled photovoltaic energy storage system. This wake-up device is applied to the energy storage inverter in the AC-coupled photovoltaic energy storage system and includes: The judgment module 51 is used to wake up the battery after being woken up by the AC bus voltage and to determine whether the battery voltage meets the voltage requirements for the construction of the AC microgrid. If it does, the construction module 52 is triggered; if it does not, the power replenishment module 53 is triggered. The process of establishing the AC bus voltage of the energy storage inverter includes: when the duration of no voltage on the AC bus of the AC coupled photovoltaic-energy storage system reaches a first preset threshold, the photovoltaic inverter converts the DC power generated by the photovoltaic power generation system into AC power and provides it to the AC bus. Module 52 is used to build an AC microgrid and recharge the battery; The power replenishment module 53 is used to operate in power factor correction mode so as to replenish the battery with AC power generated by the photovoltaic inverter.

[0056] For a description of the wake-up device for the AC-coupled optical storage system provided in this embodiment of the invention, please refer to the aforementioned embodiment of the wake-up method for the AC-coupled optical storage system. This embodiment of the invention will not be repeated here.

[0057] Please refer to Figure 6 , Figure 6 This invention also provides a schematic diagram of the structure of a wake-up device for an AC-coupled optical storage system, the wake-up device of which includes: Memory 61 is used to store computer programs; The processor 62 is used to execute a computer program to implement the wake-up method of the AC-coupled optical storage system as described in the foregoing embodiments.

[0058] For a description of the wake-up device for the AC-coupled optical storage system provided in this embodiment of the invention, please refer to the aforementioned embodiment of the wake-up method for the AC-coupled optical storage system. This embodiment of the invention will not be repeated here.

[0059] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section. It should also be noted that in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising a..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0060] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A wake-up method for an AC-coupled optical storage system, characterized in that, Energy storage inverters used in AC-coupled photovoltaic-energy storage systems include: The battery is awakened after being awakened by the AC bus voltage, and it is determined whether the battery voltage meets the voltage requirements for the construction of the AC microgrid. The process of establishing the AC bus voltage of the energy storage inverter includes: when the duration of no voltage on the AC bus of the AC coupled photovoltaic-energy storage system reaches a first preset threshold, the photovoltaic inverter converts the DC power generated by the photovoltaic power generation system into AC power and provides it to the AC bus. If the conditions are met, an AC microgrid will be constructed and the battery will be recharged; If the conditions are not met, it will operate in power factor correction mode so that the battery can be recharged by the AC power generated by the photovoltaic inverter.

2. The wake-up method for an AC-coupled optical storage system according to claim 1, characterized in that, The process of waking up the battery after being awakened by the AC bus voltage and determining whether the battery voltage meets the voltage requirements for constructing the AC microgrid includes: After being awakened by the AC bus voltage, the photovoltaic energy management unit determines whether the total power generation of the photovoltaic power generation system is greater than the self-consumption power of the energy storage inverter. If the voltage is greater than the required voltage for building an AC microgrid, the battery is activated and it is determined whether the battery voltage meets the voltage requirements for building an AC microgrid. If the value is not greater than the value, the system operates in power factor correction mode to replenish the battery with AC power generated by the photovoltaic inverter.

3. The wake-up method for an AC-coupled optical storage system according to claim 2, characterized in that, The AC-coupled photovoltaic-storage system has multiple photovoltaic inverters, one of which acts as a proxy inverter; The process of establishing the AC bus voltage of the energy storage inverter includes: when the duration of no voltage on the AC bus of the AC coupled photovoltaic energy storage system reaches a first preset threshold, the proxy inverter constructs a frequency-biased AC microgrid on the AC bus based on the DC power generated by the photovoltaic power generation system to avoid triggering the start-up of other photovoltaic inverters except the proxy inverter. After being awakened by the AC bus voltage, the photovoltaic energy management unit determines whether the total power generation of the photovoltaic power generation system is greater than the self-consumption power of the energy storage inverter, including: After being awakened by the AC bus voltage, it receives the photovoltaic energy management unit's judgment result on the total photovoltaic power generation. The process by which the photovoltaic energy management unit determines the total photovoltaic power generation includes: Based on the current environmental parameters and the voltage values ​​of the photovoltaic modules corresponding to the proxy inverter, the total power generation of the photovoltaic power generation system is evaluated and determined. Determine whether the assessed value of the total power generation is greater than the self-consumption power of the energy storage inverter, and obtain the determination result.

4. The wake-up method for an AC-coupled optical storage system according to claim 3, characterized in that, After constructing the AC microgrid and recharging the battery, the wake-up method of the AC-coupled photovoltaic energy storage system further includes: The photovoltaic energy management unit determines whether the actual value of the total power generation of the photovoltaic power generation system is greater than the self-consumption power of the energy storage inverter. If it is greater than that, then continue to build the communication micro-network; If the value is not greater than the specified value, the construction of the AC microgrid will stop and the system will enter a dormant state.

5. The wake-up method for an AC-coupled optical storage system according to claim 3, characterized in that, The assessment of the total power generation of the photovoltaic power generation system, based on current environmental parameters and the voltage values ​​of the photovoltaic modules corresponding to the proxy inverter, includes: Determine the current environmental parameters and the voltage values ​​of the photovoltaic modules corresponding to the proxy inverter; Input the current environmental parameters and the voltage values ​​of the photovoltaic modules corresponding to the proxy inverter into the pre-trained power evaluation model to obtain the evaluation value of the total power generation of the photovoltaic power generation system output by the power evaluation model.

6. The wake-up method for an AC-coupled optical storage system according to claim 3, characterized in that, The election process for the proxy inverter includes: Every preset period, the photovoltaic energy management unit evaluates the power generation stability of each photovoltaic inverter based on a pre-trained stability assessment model and the historical power generation data of the photovoltaic modules corresponding to each photovoltaic inverter. The photovoltaic inverter with the highest power generation stability is used as the proxy inverter.

7. The wake-up method for an AC-coupled optical storage system according to any one of claims 1 to 6, characterized in that, The wake-up method for the AC-coupled optical energy storage system also includes: At the preset wake-up time, a communication micronetwork is constructed; The photovoltaic energy management unit determines whether the actual value of the total power generation of the photovoltaic power generation system is greater than the self-consumption power of the energy storage inverter. If it is greater than that, then continue to build the communication micro-network; If the value is not greater than the specified value, the construction of the AC microgrid will stop and the system will enter a dormant state.

8. The wake-up method for an AC-coupled optical storage system according to claim 7, characterized in that, The process of determining the wake-up time includes: The energy storage inverter determines the day's forecast sunshine, environmental parameters, and historical wake-up times; The energy storage inverter takes the day's sunshine forecast, environmental parameters, and historical wake-up times as input data and inputs them into a pre-trained wake-up optimization model to obtain the wake-up time for the day.

9. A wake-up device for an AC-coupled optical storage system, characterized in that, Energy storage inverters used in AC-coupled photovoltaic-energy storage systems include: The judgment module is used to wake up the battery after being woken up by the AC bus voltage and to determine whether the battery voltage meets the voltage requirements for the construction of the AC microgrid. If it does, the construction module is triggered; if it does not, the power replenishment module is triggered. The process of establishing the AC bus voltage of the energy storage inverter includes: when the duration of no voltage on the AC bus of the AC coupled photovoltaic-energy storage system reaches a first preset threshold, the photovoltaic inverter converts the DC power generated by the photovoltaic power generation system into AC power and provides it to the AC bus. Modules for building AC microgrids and charging batteries; The power replenishment module is used to operate in power factor correction mode so as to replenish the battery with AC power generated by the photovoltaic inverter.

10. A wake-up device for an AC-coupled optical storage system, characterized in that, include: Memory, used to store computer programs; A processor, configured to execute the computer program to implement the wake-up method of the AC-coupled optical storage system as described in any one of claims 1 to 8.

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