A method and apparatus for controlling an energy storage system, and an electronic device

Abstract

The application relates to the technical field of photovoltaic power generation, in particular to a control method and device of an energy storage system and electronic equipment. In the embodiment, when it is learned that a battery module is in a fault state, the fault battery module is quickly isolated from a bus, so that the fault is prevented from spreading; then, a power adjustment mode is automatically determined according to a power difference between photovoltaic power and inverter power, and the output power of the photovoltaic module or the inverter module is adjusted correspondingly, so that the photovoltaic power of the photovoltaic module and the inverter power of the inverter module satisfy a preset matching relationship; then, the mode is switched to photovoltaic full-rate grid connection, so that, after the battery module is isolated, the photovoltaic power and the inverter power can be quickly matched and the bus voltage can be stably controlled without relying on a communication link or a large-capacity buffer capacitor, the energy storage system can continuously operate without shutdown during the maintenance of the battery module, and the waste of photovoltaic energy is avoided.

Description

Technical Field

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

[0002] In existing photovoltaic (PV) power generation systems, in addition to the PV side converting solar energy into electrical energy, batteries are used for energy storage, and inverters are connected to the grid. This facilitates energy conversion between the system and the grid, allowing for energy storage to prevent waste when PV power generation is high, and for maintaining the inverter's normal operation when PV power generation is low or there is no sunlight. However, in actual operation, if a fault occurs on the energy storage battery side, to prevent the fault from spreading to other modules or causing serious problems such as system voltage spikes that burn out equipment, the entire system is usually shut down until maintenance is completed and the system is restarted. In this case, during the maintenance and restart period, the PV energy is completely wasted, resulting in low system utilization. Summary of the Invention

[0003] This application aims to provide a control method, device, and electronic equipment for an energy storage system, mainly to solve the technical problem of low system utilization caused by the waste of photovoltaic energy during fault resolution.

[0004] In a first aspect, this application proposes a control method for an energy storage system, applied to an energy storage system including a photovoltaic module, a battery module, and an inverter module, wherein the photovoltaic module, the battery module, and the inverter module are all connected to a bus, and the inverter module is also used to connect to the power grid. The method includes: when the battery module is found to be in a fault state, controlling the battery module to disconnect from the bus; obtaining a first power of the photovoltaic module and a second power of the inverter module, and determining a power adjustment mode of the energy storage system based on the first power and the second power; adjusting the output power of the photovoltaic module or the inverter module according to the power adjustment mode, so that the photovoltaic power of the photovoltaic module and the inverter power of the inverter module meet a preset matching relationship; feeding the photovoltaic power into the power grid in full, and maintaining the bus voltage of the bus through the inverter module.

[0005] In some embodiments, determining the power adjustment mode of the energy storage system based on the first power and the second power includes: calculating the absolute value of the difference between the first power and the second power; determining the power adjustment mode as a balance maintenance mode when the absolute value of the difference is less than a first threshold; determining the power adjustment mode as a photovoltaic adjustment mode when the first power is greater than the second power and the absolute value of the difference is greater than the first threshold; and determining the power adjustment mode as an inverter adjustment mode when the first power is less than the second power and the absolute value of the difference is greater than the first threshold.

[0006] In some embodiments, under the photovoltaic adjustment mode, adjusting the output power of the photovoltaic module or the inverter module according to the power adjustment method to make the photovoltaic power of the photovoltaic module and the inverter power of the inverter module meet a preset matching relationship includes: determining the target photovoltaic power of the photovoltaic module according to the preset matching relationship and the second power; determining the target output voltage of the photovoltaic module according to the target photovoltaic power in combination with a preset power-voltage array; switching the control mode of the photovoltaic module to voltage loop mode; adjusting the real-time output voltage of the photovoltaic module with the target output voltage as the voltage loop setpoint until the real-time output voltage approaches the target output voltage, and then switching the control mode of the photovoltaic module to maximum power point tracking mode.

[0007] In some embodiments, the preset matching relationship is: Pinv = Ppv * η; where Pinv is the inverter power, Ppv is the photovoltaic power, and η is the total system efficiency.

[0008] In some embodiments, the preset power-voltage array is obtained by: dividing the power demand range of the photovoltaic module into multiple power level intervals, wherein each power level interval corresponds to a voltage mapping value; obtaining real-time output power data and real-time output voltage data of the photovoltaic module during non-fault operation; for each power level interval: when the real-time output power data falls into the current power level interval, updating the voltage mapping value of the current power level interval according to the real-time output voltage data, until the real-time output power data exits the current power level interval; forming the power-voltage array based on the power level interval and the voltage mapping value.

[0009] In some embodiments, under the inverter adjustment mode, adjusting the output power of the photovoltaic module or the inverter module according to the power adjustment method to make the photovoltaic power of the photovoltaic module and the inverter power of the inverter module meet a preset matching relationship includes: determining the target inverter power of the inverter module according to the preset matching relationship and the first power; determining the corresponding target current according to the target inverter power; and controlling the real-time output current of the inverter module to switch to the target current so that the output power of the inverter module approaches the target inverter power.

[0010] In some embodiments, controlling the battery module to disconnect from the bus includes: sampling the feedback signal of the battery module; when the feedback signal exceeds a preset threshold, outputting a set signal to a first pin based on the feedback signal, wherein the first pin is configured in TZ trigger mode; and performing signal blocking in response to the set signal to disconnect the battery module from the bus.

[0011] In some embodiments, maintaining the bus voltage of the bus via the inverter module includes: acquiring the adjusted inverter power; assigning an initial value to the integral term of a PI controller based on the adjusted inverter power, wherein the PI controller has a preset proportional gain and integral gain, and takes the bus voltage deviation as input and the adjustment target of the inverter power as output; connecting the PI controller with the initial value to a control loop, and adjusting the output power of the inverter module based on the sampled value of the bus voltage as feedback, so as to maintain the bus voltage.

[0012] Secondly, this application also proposes an energy storage system control device for use in an energy storage system, the energy storage system including a photovoltaic module, a battery module, and an inverter module, wherein the photovoltaic module, the battery module, and the inverter module are all connected to a bus, and the inverter module is also used to connect to the power grid. The device includes: a battery isolation module, used to control the battery module to disconnect from the bus when a fault is detected in the battery module; a power acquisition module, used to acquire a first power of the photovoltaic module and a second power of the inverter module, and determine the power adjustment mode of the energy storage system based on the first power and the second power; a first control module, used to adjust the output power of the photovoltaic module or the inverter module according to the power adjustment mode, so that the photovoltaic power of the photovoltaic module and the inverter power of the inverter module meet a preset matching relationship; and a second control module, used to feed the full photovoltaic power into the power grid and maintain the bus voltage of the bus through the inverter module.

[0013] Thirdly, this application proposes an electronic device comprising: at least one processor and a memory; the memory is coupled to the processor and is used to store instructions or programs that, when executed by the at least one processor, cause the at least one processor to perform the energy storage system control method described above.

[0014] Unlike related technologies, the energy storage system control method, device, and electronic equipment provided in this application quickly isolate the faulty battery module from the bus when a fault is detected, preventing the fault from spreading. Then, it automatically determines the power adjustment method based on the power difference between the photovoltaic power and the inverter power, and adjusts the output power of the photovoltaic module or the inverter module accordingly to ensure that the photovoltaic power and inverter power meet a preset matching relationship. Then, it smoothly switches to a fully grid-connected photovoltaic mode, ensuring circuit safety without shutdown and reducing energy waste from the photovoltaic module. Therefore, this embodiment achieves rapid matching of photovoltaic power and inverter power and stable control of the bus voltage without relying on communication links or large-capacity buffer capacitors after battery module fault isolation, ensuring continuous operation of the energy storage system even during battery module maintenance and avoiding photovoltaic energy waste. Attached Figure Description

[0015] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations are not intended to limit the embodiments. Elements having the same reference numerals in the drawings are designated as similar elements. Unless otherwise stated, the figures in the drawings are not intended to be scaled.

[0016] Figure 1 This is a schematic diagram of the structure of an energy storage system according to some embodiments of this application; Figure 2 This is a circuit diagram of an energy storage system according to some embodiments of this application; Figure 3 This is a flowchart illustrating the energy storage system control method of some embodiments of this application; Figure 4 This is a schematic block diagram of the inverter power closed-loop control structure of some embodiments of this application; Figure 5a The following are simulation diagrams of the DC-DC circuit and PV operation before and after a battery module failure in some embodiments of this application, with a time range of 0s-0.4s; Figure 5b The above are enlarged views of the simulation diagrams of the DC-DC circuit and PV operation before and after the battery module failure in some embodiments of this application, with a time range of 0.198s-0.202s. Figure 5cThis is a simulation diagram of the relevant parameters of the bus and inverter module before and after a battery module failure in some embodiments of this application; Figure 6 This is a schematic diagram of the structure of an energy storage system control device according to some embodiments of this application; Figure 7 This is a schematic diagram of the structure of an electronic device according to some embodiments of this application. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0018] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0019] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0020] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0021] The technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0022] This application provides a control method for an energy storage system, applied to an energy storage system. Please refer to... Figure 1 The energy storage system 100 in this embodiment includes a photovoltaic module 11, a battery module 12, and an inverter module 13. As shown in the figure, the photovoltaic module 11, battery module 12, and inverter module 13 are all connected to the bus BUS, and the inverter module 13 is also used to connect to the power grid 200. It is understood that... Figure 1 Capacitors C3 and C4 are bus capacitors, used together with the bus BUS to form the bus balance arm.

[0023] This embodiment provides an example of the circuit structure of an energy storage system. Please refer to... Figure 2 As shown in the figure, in this example, photovoltaic module 11 includes photovoltaic modules and a Boost circuit structure. The photovoltaic modules are connected to the bus BUS through the Boost circuit structure to feed photovoltaic energy into the bus BUS. Battery module 12 includes an energy storage battery and a DC-DC circuit structure. The energy storage battery is connected to the bus BUS through the DC-DC circuit structure to absorb or release power to regulate the bus voltage and maintain the relative stability of the bus voltage under non-fault conditions. Inverter module 13 is used to realize bidirectional energy conversion between the bus BUS and the power grid 200. Specifically, when photovoltaic energy is sufficient, the output power of photovoltaic module 11 is relatively high, and photovoltaic module 11 provides energy to battery module 12 and inverter module 13. At this time, battery module 12 is in charging mode, storing excess energy in the energy storage battery. When photovoltaic energy is insufficient, the output power of photovoltaic module 11 is relatively low, and photovoltaic module 11 and battery module 12 jointly provide energy to inverter module 13. At this time, battery module 12 is in discharging mode, supplementing the power gap through the energy storage battery, thereby maintaining the relative stability of the bus voltage and maximizing the utilization rate of photovoltaic energy.

[0024] For the aforementioned energy storage system, if a battery module suddenly fails, this embodiment provides an energy storage system control method to promptly isolate the faulty battery module and maintain bus voltage stability through rapid matching and adjustment of photovoltaic power and inverter power, thereby minimizing photovoltaic energy waste during battery module maintenance. It is understood that the energy storage system also includes a main control module (not shown in the figure), typically containing a main control chip, such as a C2000 series digital signal processor, and basic functional circuits, such as sampling circuits and PWM drive circuits. This main control module is electrically connected to the aforementioned photovoltaic module 11, battery module 12, and inverter module 13, respectively, and is used to execute the energy storage system control method. Please refer to... Figure 3 The method includes: S11. When the battery module is found to be in a fault state, control the battery module to disconnect from the bus.

[0025] Considering that a fault may be accompanied by dangerous signals such as excessively high transient currents, this embodiment integrates a threshold comparison logic circuit into the sampling circuit. The sampling circuit collects electrical signals from the energy storage battery or DC-DC circuit in real time as feedback signals, such as voltage or current signals. The threshold comparison logic circuit then compares this feedback signal with a preset threshold. If the feedback signal exceeds the preset threshold, for example, due to an excessively high transient current signal, the threshold comparator transmits a set signal to the first pin of the DSP (Digital Signal Processor), which is configured in TZ (Trip Zone) mode. When TZ is triggered, the DSP responds to the set signal and can execute PWM blocking with a microsecond-level response speed, thereby disconnecting the battery module from the bus and preventing damage to the power devices.

[0026] This embodiment uses a hardware-triggered protection mechanism with a microsecond-level response speed compared to software detection. It can quickly block out dangerous signals such as overcurrent, preventing damage to power devices such as MOSFETs. At the same time, it isolates the fault range to the battery module, providing a safety guarantee for the continuous operation of the photovoltaic module and inverter module.

[0027] S12. Obtain the first power of the photovoltaic module and the second power of the inverter module, and determine the power adjustment mode of the energy storage system based on the first power and the second power.

[0028] After successfully isolating the faulty battery module from the bus, to ensure the continued stable operation of the energy storage system, the power output of the photovoltaic module and the inverter module needs to be matched to guarantee uninterrupted photovoltaic energy output and prevent significant fluctuations in the bus voltage. To address this, this embodiment obtains the first power of the photovoltaic module and the second power of the inverter module, determines the power adjustment method of the energy storage system based on the magnitude of the first and second power, and thus restores the power balance between the photovoltaic module and the inverter module. This allows the system to operate without shutdown during battery module maintenance, maximizing the utilization rate of photovoltaic energy.

[0029] Specifically, the absolute value of the difference between the first power and the second power is calculated.

[0030] a. When the absolute value of the difference is less than the first threshold, the power adjustment method is determined to be the balance maintenance mode.

[0031] The first threshold can be pre-set according to system parameters, such as the capacity of the bus capacitor and the allowable fluctuation range of the bus voltage. This first threshold is suitable for the current energy storage system and can be used to determine whether the power difference between the photovoltaic module and the inverter module is within the system's acceptable range.

[0032] When the absolute value of this difference is less than the first threshold, it indicates that the current photovoltaic power and inverter power are basically matched, and the difference is within the range that the system can withstand. The bus voltage will not fluctuate drastically due to power imbalance. Therefore, the power adjustment method is determined to be the balance maintenance mode, and no additional power adjustment is required. The system can directly proceed to the subsequent bus voltage maintenance process.

[0033] b. When the first power is greater than the second power and the absolute value of the difference is greater than the first threshold, the power adjustment method is determined to be photovoltaic adjustment mode.

[0034] This situation indicates that the photovoltaic (PV) power is significantly higher than the inverter power. In this case, the excess PV energy will charge the bus capacitor. If the power is not adjusted in time, the bus voltage will continue to rise, potentially triggering overvoltage protection or even damaging the equipment. Therefore, the power adjustment method is determined to be PV adjustment mode, which quickly reduces the output power of the PV modules to ensure that the PV power of the PV modules and the inverter power of the inverter modules meet the preset matching relationship.

[0035] In the above steps, when ensuring that the photovoltaic power and inverter power meet the preset matching relationship, the system's energy conversion efficiency is taken into account. For example, in this embodiment, the preset matching relationship is Pinv = Ppv * η, where Pinv is the inverter power, Ppv is the photovoltaic power, and η is the total system efficiency. Therefore, assuming that in a certain energy storage system, the photovoltaic module efficiency is 98% and the inverter module efficiency is 97%, then the actual balance matching situation is: Pinv = Ppv * 98% * 97%. Here, "98% * 97%" is the aforementioned η.

[0036] It is understood that the overall system efficiency η is usually the result of the combined effects of factors such as PV power Ppv, bus voltage Vbus, and temperature Temp. This embodiment only considers the main factors: η = f(Ppv, Vbus, Temp). Therefore, this embodiment obtains this parameter η through pre-measurement, interleaved value taking, and table lookup. As one possible embodiment, power is set in increments of 500W, bus voltage in increments of 40V, and temperature in increments of 20°C. This pre-tuning through experimental testing yields a three-dimensional array of overall system efficiency η based on PV power, bus voltage, and temperature, which serves as the current system efficiency array data and is stored in the DSP's memory. Thus, in actual use, the system can query this efficiency array data based on the current PV power, bus voltage, and temperature, directly calling the corresponding η value for calculation, ensuring power matching accuracy while reducing engineering implementation difficulty.

[0037] c. When the first power is less than the second power and the absolute value of the difference is greater than the first threshold, the power adjustment method is determined to be the inverter adjustment mode.

[0038] This situation indicates that the inverter power is significantly higher than the photovoltaic power. In this case, the photovoltaic module cannot provide enough energy to meet the inverter module's needs. If the power is not adjusted in time, the bus voltage will continue to drop, potentially triggering undervoltage protection, abnormal inverter module output, or even system shutdown. Therefore, the power adjustment method is determined to be inverter adjustment mode, rapidly reducing the inverter module's output power to ensure that the inverter power and photovoltaic power meet the aforementioned preset matching relationship.

[0039] Based on the judgment and execution of the above three power adjustment methods, the system can automatically select the most suitable power matching strategy after the battery module is isolated due to a fault, based on the comparison results of photovoltaic power and inverter power, thereby maintaining the stability of the bus voltage. Moreover, it does not need to rely on the memory of the charging and discharging state before the battery fault, but can complete the task based on real-time power data. The response speed is fast, so that the energy storage system does not need to be shut down during battery module maintenance, thus improving the utilization rate of photovoltaic energy.

[0040] S13. Adjust the output power of the photovoltaic module or the inverter module according to the power adjustment method so that the photovoltaic power of the photovoltaic module and the inverter power of the inverter module meet the preset matching relationship.

[0041] After determining the power adjustment method according to step S12 above, the corresponding power adjustment operation is performed. The following describes the three cases separately.

[0042] A. In balance maintenance mode, since the current photovoltaic power and inverter power are basically matched, the power difference is within the system's tolerance range, and the bus voltage will not fluctuate drastically due to power imbalance. Therefore, it is not necessary to adjust the output power of the photovoltaic module or inverter module, and keep their current output power unchanged, and directly proceed to the subsequent process.

[0043] B. In photovoltaic adjustment mode, since the photovoltaic power is significantly higher than the inverter power, it is necessary to quickly reduce the output power of the photovoltaic module to match the inverter power of the inverter module.

[0044] Understandably, when photovoltaic power experiences sudden fluctuations or abrupt changes, the power control loop needs a certain control margin to ensure the overall stable operation of the system. If the inverter module always operates at its maximum capacity limit, then when the photovoltaic power suddenly increases, the inverter module will not be able to provide additional absorption capacity, causing excess energy to impact the bus and resulting in bus voltage overshoot. Therefore, in this embodiment, after the energy storage battery and DCDC circuit fail to disconnect from the system, the theoretical power specification of the inverter module is appropriately reduced.

[0045] As one possible implementation, the theoretical specifications of the inverter module are lowered to 95% of the original specifications. In actual operation, the photovoltaic power is kept in balance with 95% of the original power specifications of the inverter module. Therefore, when the photovoltaic power suddenly increases, the inverter module can increase its output from 95% to 100% of the original specifications, utilizing this 5% margin to absorb excess energy output to the bus due to abnormal photovoltaic fluctuations. Conversely, if the photovoltaic power suddenly decreases, the inverter module can automatically maintain balance by reducing its output power; this will not be elaborated further here. It should be noted that this 95% value is merely an example provided in this embodiment and is not a limitation; other suitable values ​​different from 95% can be selected in other embodiments.

[0046] In the photovoltaic adjustment mode, step S13 includes: determining the target photovoltaic power of the photovoltaic module based on the preset matching relationship and the second power; determining the target output voltage of the photovoltaic module based on the target photovoltaic power using a preset power-voltage array; and adjusting the output voltage of the photovoltaic module to the target output voltage so that the output power of the photovoltaic module approaches the target photovoltaic power. The preset matching relationship is Pinv = Ppv * η, and a suitable η can be determined by combining the efficiency array data from the above embodiment, thereby determining the target photovoltaic power. Here, taking the 95% example above, the steady-state target value of the inverter power Pinv can be set to 95% of the original inverter specification, rather than 100%, thus reserving adjustment space for upward fluctuations in photovoltaic power.

[0047] In this application, the aforementioned preset power-voltage array can be obtained in the following way: the power demand range of the photovoltaic module is divided into multiple power level intervals, wherein each power level interval corresponds to a voltage mapping value; for each power level interval: when the real-time output power data falls into the current power level interval, the voltage mapping value of the current power level interval is updated according to the real-time output voltage data until the real-time output power data leaves the current power level interval; the power-voltage array is formed based on the power level interval and the voltage mapping value.

[0048] This embodiment is illustrated by a specific example. For example, if the power range of a certain energy storage system is 0-5000w, then 200w can be selected as a power level. Based on this, a power-voltage array PvPowerVolt

[24] is defined to represent the voltage magnitude corresponding to each power level of the photovoltaic system. First, the power-voltage array is formed based on each power level range and its voltage mapping value. In this example, PvPowerVolt[0] represents the voltage when the photovoltaic power is 0-200W; PvPowerVolt[1] represents the voltage when the photovoltaic power is 200-400W; PvPowerVolt[2] represents the voltage when the photovoltaic power is 400-600W, and so on. Then, the corresponding voltage mapping value is determined based on the actual operating data during the normal operation of the energy storage system. Taking PvPowerVolt[0] as an example: the voltage range corresponding to PvPowerVolt[0] is 0-200W. In order to improve the accuracy of the data, the operating data near the middle value of the 0-200W range can be selected for updating, such as the operating data in the 50-150W range. Based on this, when the photovoltaic power enters the 50-150W range, the voltage mapping value corresponding to PvPowerVolt[0] is updated in real time to the voltage at this time. When the photovoltaic power leaves the 50-150W range, the value is stopped from being updated, thus determining the voltage mapping value corresponding to PvPowerVolt[0]. The voltage mapping values ​​corresponding to other power levels are also determined in this way, which will not be elaborated here. Thus, in this embodiment, through this simple method, without the need for a complex prediction model, the system can obtain the required power and voltage relationship, providing accurate and reliable data support for quickly determining the target photovoltaic power. It can be understood that

[24] and 200W here are examples of division given for the convenience of explaining the implementation method of this embodiment. In actual application, different divisions can be selected according to different application scenarios.

[0049] Based on this, this embodiment provides a certain adjustment margin when determining the target output voltage of the photovoltaic module through the power-voltage array. Specifically, when actual power matching is required, the expected output voltage is taken as the quasi-output voltage, and the power level range corresponding to the quasi-output voltage is obtained. When it corresponds to PvPowerVolt[n] (n>=2), the voltage mapping value corresponding to PvPowerVolt[n-2] is selected as the target output voltage to provide a certain adjustment margin. When n<2, since the actual power value is small, the voltage mapping value of PvPowerVolt[n] is directly selected as the target output voltage, and no adjustment margin is required in this case.

[0050] Once the target output voltage is determined, the output voltage of the photovoltaic module is adjusted to that target output voltage so that the output power of the photovoltaic module approaches the target photovoltaic power. It is understood that the control mode of the photovoltaic module is typically Maximum Power Point Tracking (MPPT) mode, where the controller tracks the maximum power point as the control target. While this achieves power regulation, the response speed is relatively slow. Therefore, this embodiment provides an adjustment method for quickly reducing the power of the photovoltaic module to match the inverter power of the inverter module.

[0051] Specifically, the control mode of the photovoltaic module is switched to voltage loop mode. In this voltage loop mode, the controller directly controls the output voltage. Using the target output voltage as the voltage loop setpoint, the voltage loop controller adjusts the real-time output voltage of the photovoltaic module to accelerate the adjustment. Once the real-time output voltage approaches the target output voltage, the voltage loop mode is immediately exited, and the control mode of the photovoltaic module is switched back to maximum power point tracking (MPPT) mode. The output of the voltage loop controller is used to adjust the duty cycle of the switching transistors in the Boost circuit, thereby changing the output voltage of the photovoltaic module. During this process, the output voltage of the photovoltaic module is monitored in real time, and its deviation from the target output voltage is calculated. When the real-time output voltage approaches the target output voltage, for example, when the absolute value of the deviation is less than a preset voltage deviation threshold (e.g., 2V), it indicates that the photovoltaic power has essentially decreased to near the target photovoltaic power. At this point, the control mode of the photovoltaic module is switched back to maximum power point tracking (MPPT) mode to resume tracking the maximum power point of the photovoltaic module.

[0052] By constructing and updating a power-voltage mapping array in real time, the system quickly looks up the table and determines the target output voltage in the event of a fault, combined with adjustment margin, and temporarily switches to voltage loop mode for rapid power matching. This solution eliminates the need for complex photovoltaic power prediction models, utilizing only historical voltage data to quickly locate the target operating point. It can rapidly reduce photovoltaic power after battery disconnection, causing the output power of the photovoltaic module to decrease quickly and approach the target photovoltaic power, thus ensuring a preset matching relationship between photovoltaic power and inverter power. Simultaneously, with reserved power adjustment space on the inverter side, it avoids voltage spikes on the bus due to excessive power, achieving millisecond-level rapid reduction and smooth matching of photovoltaic power after a sudden battery module failure in the energy storage system, effectively preventing bus voltage surges and system shutdowns.

[0053] C. In inverter adjustment mode, since the inverter power is significantly higher than the photovoltaic power, it is necessary to quickly reduce the output power of the inverter module to match the photovoltaic power of the photovoltaic module.

[0054] Similar to the photovoltaic adjustment mode described above, this embodiment also determines the inverter power based on the preset matching relationship Pinv=Ppv*η. The specific method for obtaining this preset matching relationship has been detailed in the photovoltaic adjustment mode and will not be repeated here.

[0055] After the energy storage battery and DC-DC circuit disconnect from the system due to a fault, the steady-state operating point of the inverter module also follows the aforementioned downward adjustment principle. As one possible implementation, the steady-state target value of the inverter module is set to 95% of the original specification. In inverter adjustment mode, because the current inverter power is too high, it needs to be quickly reduced to a level matching the photovoltaic power. Under normal circumstances, this matching level should be lower than or equal to 95% of the original specification, thus reserving adjustment space for upward fluctuations in photovoltaic power. If the photovoltaic power itself is high, causing Ppv*η to approach or exceed 95% of the original specification, the target inverter power will be limited to within 95% of the original specification, ensuring that the system operates within the reserved margin operating range. Similarly, this 95% value is only an example provided in this embodiment and is not a limitation; other suitable values ​​different from 95% can be selected in other embodiments.

[0056] Once the target inverter power is determined, the output power of the inverter module is quickly adjusted to that target value. Compared to the voltage loop regulation method of photovoltaic modules, the power adjustment of the inverter module is more direct: the corresponding target current value is calculated based on the target inverter power and the current bus voltage; the real-time output current of the inverter module is controlled to switch to the target current, so that the output power of the inverter module approaches the target inverter power.

[0057] Specifically, based on the power calculation formula, the target current is calculated according to the target inverter power and bus voltage. This target current is then sent as a current command to the inverter module's inner current loop controller. The inner current loop is an inherent fast tracking control loop of the inverter module, possessing high bandwidth and response speed. Upon receiving the current command, the inverter module's inner current loop controller immediately adjusts the duty cycle of the inverter module's switching transistors, rapidly switching the actual output current of the inverter module to the target current. Because a direct jump command is used, rather than a gradual ramp, the inner current loop can complete tracking in an extremely short time, typically within microseconds to milliseconds, thus rapidly reducing the inverter module's output power to near the target inverter power.

[0058] During the current jump, the output current and bus voltage of the inverter module are monitored in real time. When the output current stabilizes near the target current, for example, when the absolute value of the deviation is less than the preset current deviation threshold, it indicates that the inverter power has basically dropped to the target inverter power.

[0059] It should be noted that in inverter regulation mode, since the inverter power is actively reduced while the photovoltaic power remains unchanged, the risk of power overshoot that may occur in photovoltaic regulation mode is extremely rare. Furthermore, because the current loop response speed of the inverter module is typically faster than the voltage loop response speed of the photovoltaic module, the power matching process in inverter regulation mode is usually shorter than that in photovoltaic regulation mode. Therefore, this embodiment, by directly switching current commands and utilizing the inverter module's current loop for rapid tracking, can complete the rapid reduction of inverter power in a very short time, preventing the bus voltage from continuously dropping due to power shortages, thereby quickly achieving power regulation on the inverter side.

[0060] S14. Feed the photovoltaic power into the grid in full and maintain the bus voltage of the bus through the inverter module.

[0061] After step S13 is completed, the photovoltaic power and inverter power meet the preset matching relationship. At this time, all the output power of the photovoltaic module is fed into the grid, and the inverter module takes over the stable control of the bus voltage. It can be understood that when the battery module is not faulty, the energy storage system works normally, and the DC-DC circuit structure in the battery module is usually responsible for maintaining the stable regulation of the bus voltage. In this embodiment, when the battery module is disconnected from the system, the bus stability control is switched to the inverter module, that is, the AC terminal of the system, and the inverter output power is regulated by the bus voltage loop (PI controller), thereby realizing full grid connection of photovoltaic power.

[0062] In some embodiments, step S14 includes: acquiring the adjusted inverter power; assigning an initial value to the integral term of the PI controller based on the adjusted inverter power, wherein the PI controller has a preset proportional gain and integral gain, and takes the bus voltage deviation as input and the inverter power adjustment target as output; connecting the PI controller with the initial value to the control loop, and using the sampled value of the bus voltage as feedback, adjusting the output power of the inverter module to maintain the bus voltage.

[0063] Specifically, this embodiment uses a PI controller to achieve closed-loop regulation of the aforementioned bus voltage. The PI controller has preset proportional gain Kp and integral gain Ki, takes the bus voltage deviation as input, and outputs the inverter power regulation target; the bus voltage deviation refers to the difference between the bus voltage reference value and the sampled value. This embodiment provides an example of a PI controller: typedef struct { floatRef; / / Input: reference set-point (representing the bus voltage reference value) floatFbk; / / Input: feedback (represents the bus voltage feedback value) floatOut; / / Output: controller output (represents the output value of the PI controller, i.e., the target inverter power) floatKp; / / Parameter: proportional loop gain floatKi; / / Parameter: integral gain floatUmax; / / Parameter: upper saturation limit (indicates the upper limit parameter for output) floatUmin; / / Parameter: lower saturation limit (indicates the lower output limit parameter) floatup; / / Data: proportional term (representing the proportional data variable) floatui; ​​ / / Data: integral term (representing the integral term data variable) floatv1; / / Data: pre-saturated controller output (representing anti-saturation auxiliary data variable) float i1; / / Data: integrator storage: ui(k-1) (represents the integral term of the previous period) } PI_CONTROLLER_TEST; PI_CONTROLLER_TEST v; Additionally, the transient matching target is defined as InvMatchTarget.

[0064] The theoretical proportional output at this moment is calculated as: v.up = v.Kp * (v.Ref - v.Fbk); Then, based on this moment, the controller's integral output is initialized with the value: v.ui = InvMatchTarget - v.up; thus, the integral term of the PI controller is initialized.

[0065] Specifically, in the control cycle before the PI controller is officially connected to the control loop, firstly, the proportional term output v.up is calculated based on the current bus voltage deviation. Then, in order to make the output of the PI controller equal to the transient matching target InvMatchTarget at the moment of connection, the integral term is initialized to v.ui. At the same time, the storage variable v.i1 of the integral term in the previous cycle is also initialized to the same value, i.e., v.i1=v.ui, in order to maintain the consistency of the integral history.

[0066] After initializing the PI controller, it is connected to the control loop so that the output of the PI controller at the moment of connection is v.Out=v.up+v.ui=v.up+(InvMatchTarget-v.up)=InvMatchTarget. That is, the initial output of the PI controller is exactly equal to the adjusted inverter power InvMatchTarget, thereby achieving a smooth cut-in without impact, and thus enabling the inverter module to maintain the stability of the bus voltage based on the PI controller.

[0067] By employing the above method, this embodiment avoids the significant bus voltage fluctuations caused by conventional PI controllers integrating from zero by assigning an initial value to the PI controller's integral term. Furthermore, through closed-loop regulation after connection, the inverter module responds to changes in bus voltage in real time, dynamically adjusting its output power to ensure bus voltage stability. Simultaneously, the inverter module feeds all the output power of the photovoltaic module into the grid, maximizing the utilization of photovoltaic energy and enabling the energy storage system to operate continuously without shutdown even after battery module failure isolation.

[0068] Please combine Figure 4 , Figure 4 This is a schematic diagram of the inverter power closed-loop control structure based on a PI controller. As shown in the figure, when the battery module disconnects from the system, the bus stability control is switched to the inverter module. The items shown in the figure are: the sampled and accumulated bus voltage (BUSsum), the target setpoint of the bus voltage (busref), the proportional gain (kp), the integral gain (ki), the effective value of the grid voltage (gridrms), the phase-locked loop signal (lock_sign) (usually 0 or 1), the target value of the output current (Itarget), the first reference current (Iref1), and the second reference current (Iref2). This control structure uses the bus voltage as the controlled variable and the PI controller as the core control unit. This PI controller is the PI controller described in S14 above, with preset proportional and integral gains, taking the bus voltage deviation as input and the inverter power adjustment target as output. The inverter module adjusts the power fed into the grid accordingly to maintain the stability of the bus voltage. The specific implementation of this control structure has been detailed above, including the initial value assignment of the integral term of the PI controller and output limiting, etc., and will not be repeated here.

[0069] Please combine Figures 5a-5c A simulation model was built based on a simulation platform using energy storage system control methods. Figures 5a-5c The simulation diagram is the corresponding simulation model, where, Figure 5a and Figure 5b This document describes the changes in various parameters of the DC-DC circuit and PV operation before and after the battery module failure. Figure 5b for Figure 5a A magnified schematic diagram near 0.2s. Here, ILpv1 represents the PV current, specifically the PV Boost inductor current, and Vpv1 represents the PV voltage; ILdc1 represents the DC-DC circuit inductor current, and gldc1u and gldc1d represent the drive signals for the upper and lower transistors of the DC-DC circuit, respectively. Figure 5c This diagram illustrates the operation of the bus and inverter module after battery module isolation. VBusSum represents the total DC bus voltage, ILinv1 and ILinv2 represent the inverter module output current, Vgrid1 and Vgrid2 represent the grid voltage, and powertarget1 and powertarget2 represent the inverter power command targets (power targets). The diagram shows powertarget1 / 2. Figure 5a and 5b As shown, from 0-0.2s, the battery module is in normal condition, Vpv1 is stable at approximately 450V, PV is generating full power normally, ILpv1 is stable at approximately 5-10A, the upper and lower transistors of the DC-DC circuit are driving normally and complementing each other, and the DC-DC circuit is working normally. At 0.2s, corresponding to the fault moment, both the upper and lower transistors are pulled low, the DC-DC circuit hard-blocks the waveform, ILdc1 quickly returns to zero, the battery module is completely isolated, ILpv1 remains almost unchanged, without any drop or restart, only slightly decreasing. Please further investigate... Figure 5c Within 0-0.2s, the bus voltage VBusSum stabilizes at around 750V, with voltage regulation by the DC-DC circuit. powertarget1 / 2 rises slowly, and the power output is normal. At 0.2s, VBusSum spikes slightly and then immediately drops back down without a significant drop, stabilizing at around 750V. The inverter current sine wave is continuous, without distortion or interruption, and powertarget1 / 2 quickly matches and adjusts.

[0070] As shown in the figure, after the DC-DC circuit fault is triggered at 0.2s, the system quickly executes the wave-blocking protection, the battery module-side drive signal is instantly shut off, and the current rapidly drops to zero, achieving microsecond-level fault isolation. The photovoltaic side voltage and current remain continuously stable throughout, without restarting, current interruption, or significant fluctuations, ensuring continuous photovoltaic energy output. The DC bus voltage experiences only slight transient fluctuations before quickly recovering to stability, without significant overshoot or drop. The inverter output current maintains a good sinusoidal waveform with the grid voltage, and the power command is quickly matched and adjusted. The system seamlessly switches from DC-DC circuit voltage regulation mode to pure photovoltaic grid-connected mode, verifying the effectiveness of the invention's rapid fault isolation, transient power matching, and smooth control strategy switching, achieving maximum utilization of photovoltaic energy and safe and stable system operation under fault conditions. It should be noted that... Figures 5a-5c Color images are needed to present a realistic effect; using black and white images will fail to highlight the differences between parameters due to overlapping line segments.

[0071] The energy storage system control method provided in this application quickly isolates the faulty battery module from the bus when a fault is detected, preventing the fault from spreading. Then, it automatically determines the power adjustment method based on the power difference between the photovoltaic power and the inverter power, and adjusts the output power of the photovoltaic module or the inverter module accordingly to ensure that the photovoltaic power and inverter power meet a preset matching relationship. Finally, it smoothly switches to a fully grid-connected photovoltaic mode, ensuring circuit safety without shutdown and reducing energy waste from the photovoltaic module. Therefore, this embodiment achieves rapid matching of photovoltaic power and inverter power and stable control of the bus voltage after battery module fault isolation without relying on communication links or large-capacity buffer capacitors. This ensures continuous operation of the energy storage system during battery module maintenance, preventing photovoltaic energy waste. Furthermore, by lowering the steady-state operating point of the inverter module to reserve adjustment margin, it enhances the robustness of the energy storage system to sudden changes in photovoltaic power.

[0072] This application also proposes an energy storage system control device for use in an energy storage system, which includes a photovoltaic module, a battery module, and an inverter module. The photovoltaic module, battery module, and inverter module are all connected to a busbar, and the inverter module is also used to connect to the power grid. (Please refer to...) Figure 6The energy storage system control device 300 includes a battery isolation module 31, a power acquisition module 32, a first control module 33, and a second control module 34. Specifically, the battery isolation module 31 can disconnect the battery module from the bus when it detects that the battery module is in a fault state; the power acquisition module 32 can acquire the first power of the photovoltaic module and the second power of the inverter module, and determine the power adjustment mode of the energy storage system based on the first power and the second power; the first control module 33 can adjust the output power of the photovoltaic module or the inverter module according to the power adjustment mode, so that the photovoltaic power of the photovoltaic module and the inverter power of the inverter module meet a preset matching relationship; the second control module 34 can feed the photovoltaic power into the grid in full and maintain the bus voltage of the bus through the inverter module.

[0073] It should be noted that the above-mentioned energy storage system control device can execute the energy storage system control method provided in the embodiments of this application, and has the corresponding functional modules and beneficial effects of the method. Technical details not described in detail in the embodiments of the energy storage system control device can be found in the energy storage system control method provided in the embodiments of this application.

[0074] like Figure 7 As shown, Figure 7 This is a schematic diagram of the hardware structure of the electronic device 400 provided in this application embodiment. The electronic device 400 includes one or more processors 41 and a memory 42. Figure 7 Taking a processor 41 as an example, the processor 41 and the memory 42 can be connected via a bus or other means. Figure 7 Taking the example of a connection between China and Israel via a bus.

[0075] The memory 41, as a non-volatile computer-readable storage medium, can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules, such as the program instructions / modules corresponding to the energy storage system control method in the embodiments of this application. The processor 41 executes various functional applications and data processing of the electronic device 400 by running the non-volatile software programs, non-volatile computer-executable programs, and modules stored in the memory 42, thereby realizing the energy storage system control method in the above method embodiments.

[0076] The memory 42 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the energy storage system control device. Furthermore, the memory 42 may include high-speed random access memory and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory 42 may optionally include memory remotely located relative to the processor 41, which can be connected to the energy storage system control device via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0077] The one or more modules are stored in the memory 42, and when executed by the one or more processors 41, they execute the energy storage system control method in the above method embodiment.

[0078] It should be noted that the aforementioned electronic devices can be the main control chip or microcontroller of the energy storage system, and can be combined with the energy storage system to implement the above-mentioned energy storage system control method.

[0079] The above-described product can execute the energy storage system control method provided in the embodiments of this application, and has the corresponding functional modules and beneficial effects for executing the energy storage system control method. Technical details not described in detail in this embodiment can be found in the energy storage system control method provided in the embodiments of this application.

[0080] This application also provides a non-volatile computer storage medium storing computer-executable instructions that are executed by one or more processors, for example... Figure 7 One of the processors 41 can enable the one or more processors to execute the energy storage system control method in any of the above method embodiments.

[0081] This application also provides a computer program product, which includes a computer program stored on a non-volatile computer-readable storage medium. The computer program includes program instructions, which, when executed by the electronic device, cause the electronic device to perform the energy storage system control method described in the above embodiments.

[0082] The device or equipment embodiments described above are merely illustrative. The unit modules described as separate components may or may not be physically separate. The components shown as module units may or may not be physical units; that is, they may be located in one place or distributed across multiple network module units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0083] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented using software and a general-purpose hardware platform, or of course, using hardware. Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), or random access memory (RAM), etc.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them; under the concept of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this application as described above. For the sake of brevity, they are not provided in detail; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A control method for an energy storage system, characterized in that, The method is applied to an energy storage system, which includes a photovoltaic module, a battery module, and an inverter module. The photovoltaic module, battery module, and inverter module are all connected to a busbar, and the inverter module is also used to connect to the power grid. When the battery module is detected to be in a fault state, the battery module is disconnected from the bus. The first power of the photovoltaic module and the second power of the inverter module are obtained, and the power adjustment mode of the energy storage system is determined based on the first power and the second power. The output power of the photovoltaic module or the inverter module is adjusted according to the power adjustment method so that the photovoltaic power of the photovoltaic module and the inverter power of the inverter module meet a preset matching relationship. The photovoltaic power is fully fed into the power grid, and the bus voltage of the bus is maintained through the inverter module; The method of determining the power adjustment mode of the energy storage system based on the first power and the second power includes: calculating the absolute value of the difference between the first power and the second power; determining the power adjustment mode as a balance maintenance mode when the absolute value of the difference is less than a first threshold; determining the power adjustment mode as a photovoltaic adjustment mode when the first power is greater than the second power and the absolute value of the difference is greater than the first threshold; and determining the power adjustment mode as an inverter adjustment mode when the first power is less than the second power and the absolute value of the difference is greater than the first threshold. In the photovoltaic adjustment mode, the output power of the photovoltaic module or the inverter module is adjusted according to the power adjustment method to ensure that the photovoltaic power of the photovoltaic module and the inverter power of the inverter module meet a preset matching relationship. This includes: determining the target photovoltaic power of the photovoltaic module based on the preset matching relationship and the second power; determining the target output voltage of the photovoltaic module based on the target photovoltaic power using a preset power-voltage array; switching the control mode of the photovoltaic module to voltage loop mode; and adjusting the real-time output voltage of the photovoltaic module using the target output voltage as the voltage loop setpoint until the real-time output voltage approaches the target output voltage, and then switching the control mode of the photovoltaic module to maximum power point tracking mode. In the inverter adjustment mode, adjusting the output power of the photovoltaic module or the inverter module according to the power adjustment method to make the photovoltaic power of the photovoltaic module and the inverter power of the inverter module meet a preset matching relationship includes: determining the target inverter power of the inverter module according to the preset matching relationship and the first power; determining the corresponding target current according to the target inverter power; and controlling the real-time output current of the inverter module to switch to the target current so that the output power of the inverter module approaches the target inverter power.

2. The method according to claim 1, characterized in that, The preset matching relationship is as follows: Pinv = Ppv * η; Where Pinv is the inverter power, Ppv is the photovoltaic power, and η is the total system efficiency.

3. The method according to claim 1, characterized in that, The preset power-voltage array is obtained in the following way: The power demand range of the photovoltaic module is divided into multiple power level intervals, wherein each power level interval corresponds to a voltage mapping value. Acquire real-time output power and output voltage data of the photovoltaic module during non-fault operation; For each power level range: when the real-time output power data falls into the current power level range, update the voltage mapping value of the current power level range according to the real-time output voltage data, until the real-time output power data exits the current power level range; The power-voltage array is formed based on the power level range and the voltage mapping value.

4. The method according to claim 1, characterized in that, Controlling the battery module to disconnect from the bus includes: The feedback signal of the battery module is sampled; When the feedback signal exceeds a preset threshold, a set signal is output to the first pin based on the feedback signal, wherein the first pin is configured in TZ mode; In response to the set signal, a signal blocking operation is performed to disconnect the battery module from the bus.

5. The method according to claim 1, characterized in that, Maintaining the bus voltage of the bus via the inverter module includes: Obtain the adjusted inverter power; The integral term of the PI controller is initialized according to the adjusted inverter power. The PI controller has a preset proportional gain and integral gain, and takes the bus voltage deviation as input and the inverter power adjustment target as output. The PI controller, after being initialized, is connected to the control loop. The sampled value of the bus voltage is used as feedback to adjust the output power of the inverter module in order to maintain the bus voltage.

6. A control device for an energy storage system, characterized in that, An application in an energy storage system, the energy storage system including a photovoltaic module, a battery module, and an inverter module, wherein the photovoltaic module, the battery module, and the inverter module are all connected to a bus, and the inverter module is also used to connect to the power grid, the device comprising: A battery isolation module is used to control the battery module to disconnect from the bus when the battery module is detected to be in a fault state. A power acquisition module is used to acquire a first power of the photovoltaic module and a second power of the inverter module, and determine the power adjustment mode of the energy storage system based on the first power and the second power; wherein, determining the power adjustment mode of the energy storage system based on the first power and the second power includes: calculating the absolute value of the difference between the first power and the second power; when the absolute value of the difference is less than a first threshold, determining the power adjustment mode as a balance maintenance mode; when the first power is greater than the second power and the absolute value of the difference is greater than the first threshold, determining the power adjustment mode as a photovoltaic adjustment mode; when the first power is less than the second power and the absolute value of the difference is greater than the first threshold, determining the power adjustment mode as an inverter adjustment mode; The first control module is used to adjust the output power of the photovoltaic module or the inverter module according to the power adjustment method, so that the photovoltaic power of the photovoltaic module and the inverter power of the inverter module meet a preset matching relationship; wherein, in the photovoltaic adjustment mode, adjusting the output power of the photovoltaic module or the inverter module according to the power adjustment method to meet the preset matching relationship includes: determining the target photovoltaic power of the photovoltaic module according to the preset matching relationship and the second power; determining the target output voltage of the photovoltaic module according to the target photovoltaic power by combining a preset power-voltage array; switching the control mode of the photovoltaic module to voltage loop mode; and adjusting the output power of the photovoltaic module according to the target power. The voltage is a voltage loop setpoint. The real-time output voltage of the photovoltaic module is adjusted until it approaches the target output voltage. Then, the control mode of the photovoltaic module is switched to maximum power point tracking mode. In the inverter adjustment mode, the output power of the photovoltaic module or the inverter module is adjusted according to the power adjustment method to ensure that the photovoltaic power of the photovoltaic module and the inverter power of the inverter module meet a preset matching relationship. This includes: determining the target inverter power of the inverter module based on the preset matching relationship and the first power; determining the corresponding target current based on the target inverter power; and controlling the real-time output current of the inverter module to switch to the target current so that the output power of the inverter module approaches the target inverter power. The second control module is used to feed the full amount of photovoltaic power into the power grid and maintain the bus voltage of the bus through the inverter module.

7. An electronic device, characterized in that, include: At least one processor and memory; The memory is coupled to the processor and is used to store instructions or programs that, when executed by the at least one processor, cause the at least one processor to perform the energy storage system control method as described in any one of claims 1-5.

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