Method and system for adjusting output power of photovoltaic energy storage equipment and photovoltaic energy storage equipment

Abstract

The invention relates to a photovoltaic energy storage equipment output power adjusting method, system and device, photovoltaic energy storage equipment, a storage medium and a computer program product. The method comprises the steps of receiving a discharge instruction carrying target output power, controlling the output voltage of the photovoltaic energy storage equipment to be a preset initial output voltage, and adjusting the output voltage according to the current variation of the output current at the current moment under the condition that the output voltage is smaller than a preset voltage value or the output current is larger than a preset current value, and the power difference between the actual output power and the target output power is in a preset power error range. According to the method, accurate power regulation and control can be realized, stable and reliable power output is flexibly provided, the condition of excessive or insufficient power output is reduced, and the stability and safety of the system are improved.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage, and particularly to a method, system, device, photovoltaic energy storage device, storage medium, and computer program product for regulating the output power of a photovoltaic energy storage device. Background Art

[0002] A photovoltaic energy storage device is a device that integrates photovoltaic power generation and energy storage, aiming to utilize solar energy to provide electricity and store excess electrical energy for future use.

[0003] Currently, photovoltaic energy storage devices have a wide range of application scenarios, including household photovoltaic power generation systems, energy management systems for commercial buildings, microgrids, and electric vehicle charging piles. Among them, a household photovoltaic power generation system usually consists of a photovoltaic array, a photovoltaic energy storage device, and an inverter. Such a system can convert solar energy into electrical energy and store excess electrical energy for use at night or during peak electricity consumption, achieving self-sufficiency and savings in household energy.

[0004] However, there are still some problems regarding the output power regulation method of photovoltaic energy storage devices. Traditional output power regulation methods are difficult to meet the requirement of accurately regulating the output power. Summary of the Invention

[0005] Based on this, in view of the above technical problems, it is necessary to provide a more accurate method, device, computer device, computer-readable storage medium, and computer program product for regulating the output power of a photovoltaic energy storage device.

[0006] In a first aspect, the present application provides a method for regulating the output power of a photovoltaic energy storage device. The method is applied to a controller in the photovoltaic energy storage device and includes:

[0007] Receiving a discharge instruction, where the discharge instruction carries a target output power;

[0008] Controlling the output voltage of the photovoltaic energy storage device to a preset initial output voltage;

[0009] In the case where the output voltage is less than a preset voltage value or the output current is greater than a preset current value, adjusting the output voltage according to the current change amount of the output current at the current moment until the power difference between the actual output power and the target output power is within a preset power difference error range.

[0010] In one embodiment, adjusting the output voltage according to the change amount of the output current at the current moment includes:

[0011] Adjusting the output voltage according to the first current change amount or the second current change amount of the output current at the current moment;

[0012] Wherein, the first current variation corresponds to the variation of the output current relative to the preset current value, the second current variation is the variation of the output current relative to the maximum power current value when the output current is greater than the maximum power current value, and the maximum power current value is greater than the preset current value.

[0013] In one embodiment, adjusting the output voltage according to the first current variation or the second current variation of the output current at the current moment includes:

[0014] Determine the maximum power current according to the target output power and the preset initial output voltage;

[0015] Obtain a first ratio of the first current variation to the maximum power current, or obtain a second ratio of the second current variation to the maximum power current;

[0016] Determine a first voltage adjustment amount according to the first ratio and a preset proportionality coefficient, or determine a second voltage adjustment amount according to the second ratio and the preset proportionality coefficient;

[0017] Adjust the output voltage according to the first current variation and the first voltage adjustment amount, or adjust the output voltage according to the second current variation and the second voltage adjustment amount.

[0018] In one embodiment, adjusting the output voltage according to the first current variation and the first voltage adjustment amount includes:

[0019] When the first current variation is a positive variation, reduce the output voltage according to the first voltage adjustment amount;

[0020] When the first current variation is a negative variation, increase the output voltage according to the first voltage adjustment amount;

[0021] Or,

[0022] Adjusting the output voltage according to the second current variation and the second voltage adjustment amount includes:

[0023] When the second current variation is a positive variation, reduce the output voltage according to the second voltage adjustment amount;

[0024] When the second current variation is a negative variation, increase the output voltage according to the second voltage adjustment amount.

[0025] In a second aspect, the present application also provides a method for adjusting the output power of a photovoltaic energy storage device, which is applied to a controller in the photovoltaic energy storage device. The method includes:

[0026] Receive a discharge instruction, and the discharge instruction carries the target output power;

[0027] Control the output voltage of the photovoltaic energy storage device to a preset initial output voltage;

[0028] When the output voltage is less than the preset voltage value or the output current is greater than the preset current value, adjust the output current according to the voltage change amount of the output voltage at the current moment relative to the preset initial output voltage until the power difference between the actual output power and the target output power is within the preset power difference error range.

[0029] In one embodiment, the method further includes:

[0030] Determine the maximum power current according to the target output power and the preset initial output voltage;

[0031] When the output current is greater than the maximum power current, adjust the output current according to the voltage change amount of the output voltage at the current moment relative to the preset initial output voltage until the power difference between the actual output power and the target output power is within the preset power difference error range.

[0032] In one embodiment, adjusting the output current according to the voltage change amount of the output voltage at the current moment relative to the preset initial output voltage includes:

[0033] Obtain the third ratio of the voltage change amount to the preset initial output voltage;

[0034] Determine the current adjustment amount according to the third ratio and the preset proportional coefficient;

[0035] Adjust the output current according to the voltage change amount and the current adjustment amount.

[0036] In one embodiment, adjusting the output current according to the voltage change amount and the current adjustment amount includes:

[0037] When the voltage change amount is a positive change amount, reduce the output current according to the current adjustment amount;

[0038] When the voltage change amount is a negative change amount, increase the output current according to the current adjustment amount.

[0039] In a third aspect, the present application further provides a photovoltaic energy storage device power adjustment system, and the system includes: a photovoltaic module, a photovoltaic energy storage device, and a micro-inverter, and the photovoltaic module is connected to the micro-inverter and the photovoltaic energy storage device;

[0040] The photovoltaic energy storage device is configured to adjust the output power according to the steps in any of the above embodiments of the photovoltaic energy storage device output power adjustment method and discharge to the micro-inverter when receiving a discharge instruction carrying a target output power sent by a client connected by communication.

[0041] Fourth aspect, the present application further provides a device for regulating the output power of a photovoltaic energy storage device, which is applied to a controller in the photovoltaic energy storage device. The device includes:

[0042] A data receiving module, configured to receive a discharge instruction, where the discharge instruction carries a target output power;

[0043] A voltage control module, configured to control the output voltage of the photovoltaic energy storage device to a preset initial output voltage;

[0044] A data monitoring module, configured to monitor the output voltage, output current, and actual output power of the photovoltaic energy storage device;

[0045] A data adjustment module, configured to, when the output voltage is less than a preset voltage value or the output current is greater than a preset current value, adjust the output voltage according to the current change amount of the output current at the current moment until the power difference between the actual output power and the target output power is within a preset power error range;

[0046] Or, when the output voltage is less than a preset voltage value or the output current is greater than a preset current value, adjust the output current according to the voltage change amount of the output voltage relative to the preset initial output voltage at the current moment until the power difference between the actual output power and the target output power is within a preset power difference error range.

[0047] Fifth aspect, the present application further provides a photovoltaic energy storage device, including a memory, a controller, and a DC conversion module. The controller is connected to the memory and the DC conversion module, and the memory stores a computer program;

[0048] The controller is configured to monitor the output voltage, output current, and actual output power of the DC conversion module, and when receiving a discharge instruction carrying a target output power, execute the computer program and adjust the actual output power of the DC conversion module according to the steps in the above embodiments of the method for regulating the output power of the photovoltaic energy storage device.

[0049] Sixth aspect, the present application further provides a computer-readable storage medium. The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps in any of the above embodiments of the method for regulating the output power of the photovoltaic energy storage device are implemented.

[0050] Seventh aspect, the present application further provides a computer program product. The computer program product includes a computer program, and when the computer program is executed by a processor, the steps in any of the above embodiments of the method for regulating the output power of the photovoltaic energy storage device are implemented.

[0051] The above photovoltaic energy storage device output power regulation method, system, device, photovoltaic energy storage device and storage medium, after receiving a discharge instruction carrying a target output power, control the output voltage of the photovoltaic energy storage device to a preset initial output voltage. In the case where the output voltage is less than a preset voltage value, or the output current is greater than a preset current value, adjust the output voltage according to the current change amount of the output current, or adjust the output current according to the voltage change amount of the output voltage relative to the preset voltage, until the power difference between the actual output power and the target output power is within a preset power error range, achieving accurate power regulation. Moreover, it can flexibly provide a stable and reliable power output, reduce the situation of excessive or insufficient power output, and improve the stability and safety of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is an application environment diagram of the photovoltaic energy storage device output power regulation method in an embodiment;

[0053] Figure 2 It is a flowchart of the photovoltaic energy storage device output power regulation method in an embodiment;

[0054] Figure 3 It is a flowchart of the photovoltaic energy storage device output power regulation method in another embodiment;

[0055] Figure 4 It is a flowchart of the step of regulating the output voltage based on the first current change amount in an embodiment;

[0056] Figure 5 It is a flowchart of the step of regulating the output voltage based on the second current change amount in an embodiment;

[0057] Figure 6 It is a flowchart of the photovoltaic energy storage device output power regulation method in yet another embodiment;

[0058] Figure 7 It is a flowchart of the photovoltaic energy storage device output power regulation method in still another embodiment;

[0059] Figure 8 It is a detailed flowchart of the photovoltaic energy storage device output power regulation method in an embodiment;

[0060] Figure 9 It is a structural block diagram of the photovoltaic energy storage device output power regulation system in an embodiment;

[0061] Figure 10 It is a structural block diagram of the photovoltaic energy storage device output power regulation device in an embodiment;

[0062] Figure 11It is a structural block diagram of a photovoltaic energy storage device output power regulation device in another embodiment;

[0063] Figure 12 It is a structural block diagram of a photovoltaic energy storage device in one embodiment. Specific implementation manners

[0064] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0065] The photovoltaic energy storage device power regulation method provided by the embodiments of the present application can be applied to, for example, Figure 1 the application environment shown. Among them, the terminal 102 communicates with the photovoltaic energy storage device 104 through a network. Specifically, a user can send a discharge instruction carrying a target output power to the controller of the energy storage device 104 through the terminal 102. The controller responds to the discharge instruction, controls the output voltage of the photovoltaic energy storage device to a preset initial output voltage, and then, monitors the output voltage, output current and actual output power of the photovoltaic energy storage device in real time. When the output voltage is less than the preset voltage value, or the output current is greater than the preset current value, the output voltage is adjusted according to the current change amount of the output current at the current moment until the power difference between the actual output power and the target output power is within the preset power error range to meet the user's power consumption requirements.

[0066] Among them, the terminal 102 can be but is not limited to various personal computers, laptop computers, smart phones, tablet computers, Internet of Things devices and portable wearable devices. The Internet of Things devices can be smart speakers, smart TVs, smart air conditioners, smart vehicle-mounted devices, etc. The portable wearable devices can be smart watches, smart bracelets, head-mounted devices, etc. The photovoltaic energy storage device 104 can be but is not limited to a micro-inverter energy storage device and a household energy storage device, etc., which are energy storage devices that use the electric energy generated by a photovoltaic array through photovoltaic power generation as input.

[0067] In one embodiment, as Figure 2 shown, a method for regulating the output power of a photovoltaic energy storage device is provided. Taking the method applied to the Figure 1 controller of the photovoltaic energy storage device 104 as an example, the method includes the following steps:

[0068] S200, receiving a discharge instruction, where the discharge instruction carries a target output power.

[0069] In this embodiment, the photovoltaic energy storage device can be, but is not limited to, a micro-inverter energy storage device, a household energy storage device (also known as a residential energy storage device), etc., as well as other energy storage devices that use the electric energy generated by a photovoltaic array through photovoltaic power generation as input. The controller in the photovoltaic energy storage device can be an MCU (Microcontroller Unit). The target output power refers to the discharge power given by the user, that is, the given output power.

[0070] In this embodiment, taking the photovoltaic energy storage device as a micro-inverter energy storage device as an example, the micro-inverter energy storage device includes a DC conversion module such as a buck-boost DC (Direct Current) / DC module and an MCU that are connected to each other. The DC conversion module is connected to an external inverter. The buck-boost DC / DC module is used to boost or lower the voltage of the DC power supply in the energy storage device to a voltage level suitable for a specific application. The MCU of the energy storage device is usually used to control and manage all aspects of the energy storage system, including battery management, charge and discharge control, communication interfaces, data acquisition and processing, and other functions. It can monitor and control the state of the energy storage system and execute various algorithms and logics to achieve the safe and efficient operation of the energy storage system.

[0071] In practical applications, when the user has an electricity demand, a discharge instruction carrying a target output power such as 200 W (watts) can be sent to the MCU through the user terminal. The MCU receives the discharge instruction, and the discharge instruction usually includes the target output power and other necessary parameters.

[0072] S400, control the output voltage of the photovoltaic energy storage device to a preset initial output voltage.

[0073] In this embodiment, the output voltage of the DC conversion module can be regarded as the output voltage of the photovoltaic energy storage device. The preset initial output voltage can be the default voltage of the DC conversion module, which is a default value. Exemplarily, the initial output voltage can be 40 V (volts).

[0074] As the control center of the energy storage device, after receiving the discharge instruction sent by the user terminal, the MCU analyzes the received discharge instruction, extracts the value of the target output power, and performs subsequent processing. Exemplarily, it can be that the MCU communicates with the DC conversion module through the communication interface, sends a control signal to the DC conversion module to control its output voltage to the preset initial output voltage (such as 40W), which can be specifically achieved by adjusting the control parameters inside the DC conversion module or sending specific control commands. After controlling the output voltage of the DC conversion module to the initial output voltage such as 40W, the MCU can periodically monitor or real-time monitor the output current and output voltage of the DC conversion module, and then calculate the actual output power based on the output current and output voltage, and compare the actual output power with the target output power to ensure that it reaches the preset target output power (2000W). In this embodiment, the monitoring period can be 2 microseconds. It can be understood that in other embodiments, the monitoring period can also be 5 microseconds, 10 microseconds, or even 10 milliseconds. The specific monitoring period can be determined according to the device model and actual situation.

[0075] S600, when the output voltage is less than the preset voltage value, or the output current is greater than the preset current value, adjust the output voltage according to the current change amount of the output current at the current moment until the power difference between the actual output power and the target output power is within the preset power error range.

[0076] In this embodiment, the preset voltage value can be determined according to the initial output voltage and experimental data. The preset voltage value is usually 0.7 or 0.8 times the initial output voltage. When the voltage is less than the preset voltage value, at this time, there is a large deviation between the output power of the energy storage device and the maximum output power, that is, the output power needs to be adjusted. The preset current value can be determined according to the performance parameters and model of the micro-inverter and a large amount of experimental data. When the current is greater than the preset current value, at this time, the micro-inverter at the load end starts to work. Since starting the micro-inverter will cause a certain voltage loss or voltage drop. In addition, as the micro-inverter works, the current flows to the load, and the energy storage device may experience a certain voltage fluctuation, and the output power will also change accordingly. Therefore, it is necessary to adjust the output power. Therefore, in this embodiment, two power adjustment conditions are set, that is, when the output voltage is less than the preset voltage value, or the output current is greater than the preset current value, the output power needs to be adjusted. Exemplarily, the preset voltage value can be 28V, and the preset current value can be 1A (ampere). The power error range can be but is not limited to 0W~0.5W, 0W~1W or other numerical ranges. In this embodiment, the power error range can be 0W~0.5W, that is, if the power difference between the actual output power and the target output power is within the power error range, it indicates that the actual output power approaches the target output power and meets the requirements set by the user.

[0077] Due to the characteristics of photovoltaic power generation, the volt-ampere characteristic curve of a solar cell usually has the following characteristics, including: the battery will generate a certain internal resistance due to factors such as internal chemical reactions and structure, which limits the maximum output current of the battery. The internal resistance will cause the output voltage of the battery to drop when the load current increases, manifested as a decrease in the slope on the volt-ampere characteristic curve. When the load current reaches a certain value, the output voltage of the battery no longer continues to drop with the increase in current and tends to be stable, which is called the saturation voltage, indicating the stable voltage output of the battery under this load.

[0078] In practical applications, after the output voltage of the DC conversion module is controlled to be 40V, as the load current continuously increases, the output voltage of the DC conversion module will drop and fluctuate. Therefore, the MCU can monitor the output voltage, output current, and actual output power of the DC conversion module. If the power difference between the actual output power and the target output power of the DC conversion module is not within the preset power error range, it indicates that the output power of the photovoltaic energy storage device does not meet the requirements set by the user, and the MCU can adjust according to the feedback information of the output current and output voltage.

[0079] In this embodiment, taking the monitoring period as 2 microseconds as an example, when it is monitored that the output voltage of the DC conversion module is less than the preset voltage value of 28V, or when the output current of the DC conversion module is greater than the preset current value of 1A, the current change amount of the output current of the DC conversion module at the current moment is obtained. Then, based on the current change amount, the adjustment of the output voltage for this round is completed. At this time, it is calculated whether the current actual power is equal to the target output power. If not, continue to adjust. When the next monitoring period arrives, the output voltage and output current of the DC conversion module at the current moment are obtained again. If it is monitored that the output voltage of the DC conversion module is still less than the preset voltage value of 28V, or the output current of the DC conversion module is greater than the preset current value of 1A, continue to obtain the current change amount of the output current at the current moment, and adjust the output voltage based on the current change amount. Through multiple monitoring and adjustment processes, gradually make the actual output power of the DC conversion module approach the target output power, that is, the power difference between the actual output power and the target output power is within the preset power error range, then stop the adjustment. At this time, the actual output power meets the user's power consumption requirements.

[0080] In the above method for adjusting the output power of the photovoltaic energy storage device, after receiving a discharge instruction carrying the target output power and controlling the output voltage of the photovoltaic energy storage device to the preset initial output voltage, the output voltage of the photovoltaic energy storage device is controlled to the preset initial output voltage. When the output voltage is less than the preset voltage value or the output current is greater than the preset current value, the output voltage is adjusted according to the monitored current change amount of the output current until the power difference between the actual output power and the target output power is within the preset power error range, achieving accurate power regulation. Moreover, it can flexibly provide a stable and reliable power output, reduce the situation of excessive or insufficient power output, and improve the stability and safety of the system.

[0081] As Figure 3 shown, in one embodiment, S600 includes: S602, when the output voltage is less than the preset voltage value or the output current is greater than the preset current value, adjusting the output voltage according to the first current change amount or the second current change amount of the output current at the current moment until the power difference between the actual output power and the target output power is within the preset power error range.

[0082] Among them, the first current change amount corresponds to the change amount of the output current relative to the preset current value, and the second current change amount is the change amount of the output current relative to the maximum power current value when the output current is greater than the maximum power current value, and the maximum power current value is greater than the preset current value.

[0083] The maximum power current refers to the current magnitude when the maximum output power can be obtained in a given circuit or device. In this embodiment, the maximum output power of the photovoltaic energy storage device is the target output power. Therefore, the ratio of the target output power to the initial output voltage is the maximum power current.

[0084] Specifically, when adjusting the output voltage according to the current change amount, there are various adjustment methods. Specifically, it can be to adjust the output voltage according to the first current change amount of the current output current relative to the preset current value. It can also be to adjust the output voltage according to the second current change amount of the output current relative to the maximum power current when the current output current is greater than the maximum power current value.

[0085] In practical applications, when the light conditions change suddenly or fluctuate greatly, or when the load suddenly increases or a short circuit occurs, or when the photovoltaic energy storage device fails or is damaged, the output current of the photovoltaic energy storage device may instantaneously exceed the maximum power current. At this time, it will affect the stability and efficiency of the photovoltaic energy storage device and even cause damage to the device.

[0086] Therefore, after receiving a discharge instruction and extracting the target output power in the discharge instruction, the maximum power current can be determined based on the target output power and the preset initial output voltage. For example, if the target output power is 200W and the preset initial output voltage is 40V, then the maximum power current = 200W / 40V = 5A. Subsequently, monitor whether the output current of the DC conversion module is greater than the maximum power current of 5A, and the monitoring period can be 10 seconds. If within the current monitoring period, such as from the 1st second to the 10th second, it is monitored that the current output current of the DC conversion module is 3A (greater than the preset current value of 1A and less than the maximum power current of 5A), then obtain the first current change amount of the output current relative to the preset current value, and based on the first current change amount, complete the adjustment of the output voltage for this round. At this time, determine whether the power difference between the current actual output power and the target output power is within the preset power error range. If not, continue to monitor. When the next monitoring period arrives, obtain the output current, output voltage, and actual output power of the DC conversion module at the current moment again. If the output current of the DC conversion module is still greater than 1A, calculate the first current change amount of the current output current relative to the preset current value again. Subsequently, based on the second current change amount, complete the adjustment of the output voltage for this round.

[0087] If within the current monitoring period, such as from the 21st second to the 30th second, it is monitored that the current output current of the DC conversion module is 6A, which is greater than the maximum power current of 5A, obtain the second current change amount (1A) of the output current relative to the maximum power current. Subsequently, based on the second current change amount, complete the adjustment of the output voltage for this round. At this time, determine whether the power difference between the current actual output power and the target output power is within the preset power error range. If not, continue to monitor. When the next monitoring period arrives, obtain the output current, output voltage, and actual output power of the DC conversion module at the current moment again. If the output current of the DC conversion module is still greater than 5A, calculate the difference between the current output current and the maximum power current again to obtain the second current change amount of the output current relative to the maximum power current. Subsequently, based on the second current change amount, complete the adjustment of the output voltage for this round. Execute the above operations multiple times, continuously monitor the output current and output voltage, and adjust the output voltage according to the second current change amount of the current output current relative to the maximum power current. Through multiple monitoring and adjustment processes, gradually make the actual output power of the DC conversion module approach the target output power and stop the adjustment so that the actual output power meets the user's power consumption requirements.

[0088] In this embodiment, by setting various ways to adjust the output voltage according to the change in current, different adjustment methods can be selected under different circumstances, which is more flexible and conducive to achieving accurate adjustment of the output power. Moreover, when it is detected that the output current is greater than the maximum power current, the output voltage is adjusted by the second current change amount, so that the power difference between the actual output power and the target output power is within the preset power error range, enabling the photovoltaic energy storage device to operate within the optimal working range and improving the stability and reliability of the device.

[0089] As Figure 4 shown, in one of the embodiments, adjusting the output voltage according to the first current change amount of the output current at the current moment includes:

[0090] S620. Determine the maximum power current according to the target output power and the preset initial output voltage.

[0091] S622. Obtain the first ratio of the first current change amount to the maximum power current.

[0092] S624. Determine the first voltage adjustment amount according to the first ratio and the preset proportionality coefficient.

[0093] S626. Adjust the output voltage according to the first current change amount and the first voltage adjustment amount.

[0094] In this embodiment, the method of adjusting the output voltage by the first current change amount is described. The specific adjustment mechanism can be that for every 10% increase / decrease in current, correspondingly, the voltage decreases / increases by 1V. Therefore, the preset proportionality coefficient can be 0.1. It can be understood that in other embodiments, the proportionality coefficient can also be, but is not limited to, other values such as 0.15 or 0.2 and other values.

[0095] In this embodiment, after the MCU extracts the target output power in the discharge instruction, the maximum power current can be determined according to the target output power and the preset initial output voltage. Specifically, if the target output power is 200W and the preset initial output voltage is 40V, then the maximum power current = 200W / 40V = 5A.

[0096] When the MCU detects that the output voltage is less than the preset voltage value, at this time, the output voltage can be further reduced through a reverse feedback method to intensify the amplitude of voltage reduction, so that the MCU detects that the voltage is too low and makes corresponding adjustments to adjust the output power of the DC conversion module to make the output power approach the expected target output power. Or, when it is detected that the output current is greater than the preset current value, it indicates that the output power is too large. At this time, the output voltage can be reduced through positive feedback to reduce the output power so that the actual output power approaches the target output power.

[0097] Specifically, the output voltage can be adjusted in the following way: obtain the first current change amount of the output current at the current moment compared with the preset current value, compare the first current change amount with the maximum power current, obtain the first ratio of the first current change amount to the maximum power current, and then divide the first ratio by the preset proportionality coefficient to obtain the first voltage adjustment amount. Next, adjust the output voltage according to the first current change amount and the first voltage adjustment amount.

[0098] In another embodiment, adjusting the output voltage according to the first current change amount and the first voltage adjustment amount can be: when the first current change amount is a positive change amount, reduce the output voltage according to the first voltage adjustment amount; when the first current change amount is a negative change amount, increase the output voltage according to the first voltage adjustment amount.

[0099] When the current change amount is a positive change amount, that is, the current increases compared with the reference value; when the current change amount is a negative change amount, that is, the current decreases compared with the reference value.

[0100] In specific implementation, it can be determined whether the first current change amount is a positive change amount or a negative change amount according to whether the output current at the current moment increases or decreases compared with the preset current value of 1A, and then adjust the output voltage according to the judgment result. Exemplarily, if the output current increases by +10% compared with the preset current value, the output voltage decreases by 1V; if the output current decreases by 10% compared with the preset current value, the output voltage increases by 1V.

[0101] Exemplarily, if the current output current is 2A and the current output voltage is 40V, the first current change amount of the current output current compared with the preset current value of 1A is a positive change, that is, +1A. At this time, the output voltage needs to be reduced, and the output voltage = 40V - (2A - 1A) / 5A / 0.1) = 38V.

[0102] In this embodiment, adjusting the output voltage according to the positive and negative changes of the current change amount can enhance the load adaptability of the photovoltaic energy storage device, make the photovoltaic energy storage device approach the optimal working state, and provide a stable power output.

[0103] As Figure 5 shown, in one embodiment, adjusting the output voltage according to the second current change amount of the output current at the current moment includes:

[0104] S640, obtain the second ratio of the second current change amount to the maximum power current.

[0105] S642, determine the second voltage adjustment amount according to the second ratio and the preset proportionality coefficient.

[0106] S644. Adjust the output voltage according to the second current change amount and the second voltage adjustment amount.

[0107] In this embodiment, the preset proportional coefficient is also 0.1. When the output current is greater than the maximum power current, the method of adjusting the output voltage based on the second current change amount can be: compare the second current change amount with the maximum power current to obtain the second ratio of the second current change amount to the maximum power current, and then divide the second ratio by the preset proportional coefficient to obtain the second voltage adjustment amount. Then, adjust the output voltage according to the second current change amount and the second voltage adjustment amount. Specifically, it can adjust the output voltage according to whether the second current change amount is a positive change.

[0108] In another embodiment, it can be that if the second current change amount is a positive change amount, then reduce the output voltage according to the second voltage adjustment amount; if the second current change amount is a negative change amount, then increase the output voltage according to the second voltage adjustment amount.

[0109] Exemplarily, if in the current monitoring period, such as from the 11th second to the 20th second, it is monitored that the output current of the DC conversion module at the current moment is 6A (greater than the maximum power current of 5A), and the output voltage at the current moment is 32V. Since the second current change amount is a positive change amount, the output voltage should be reduced, and the output voltage = 32V - (6A - 5A) / 5A / 0.1 = 30V.

[0110] In this embodiment, when the output current is greater than the maximum power current, adjusting the output voltage according to the positive and negative changes of the second current change amount can enhance the load adaptability of the photovoltaic energy storage device, make the photovoltaic energy storage device approach the optimal working state, and provide a stable power output.

[0111] As Figure 6 shown, based on the same inventive concept, the present application also provides a method for adjusting the output power of a photovoltaic energy storage device, which is applied to a controller in the photovoltaic energy storage device. This method can also be applied to the Figure 1 application environment diagram shown. The method includes:

[0112] S200. Receive a discharge instruction, and the discharge instruction carries a target output power.

[0113] S400. Control the output voltage of the photovoltaic energy storage device to be a preset initial output voltage.

[0114] S700. When the output voltage is less than the preset voltage value or the output current is greater than the preset current value, adjust the output current according to the voltage change amount of the output voltage at the current moment relative to the preset initial output voltage until the power difference between the actual output power and the target output power is within the preset power error range.

[0115] In the embodiment of the output power regulation method of the above photovoltaic energy storage device, the output power regulation mentioned is to adjust the output voltage through the change in current to control the output power of the photovoltaic energy storage device. The power regulation method in this embodiment is to adjust the output current through the change in voltage, and then control the output power.

[0116] Specifically, it can be that when it is monitored that the output voltage of the DC conversion module is less than the preset voltage value of 28V, or when the output current of the DC conversion module is greater than the preset current value of 1A, the current output voltage is compared with the preset initial voltage value such as 40V to obtain the voltage change amount of the output voltage of the DC conversion module relative to the preset initial output voltage. For example, if the current output voltage is 26V, the voltage change amount of the output voltage relative to the preset initial output voltage is 2V. Then, based on the voltage change amount, the adjustment of the output current for this round is completed. At this time, calculate whether the current actual power is equal to the target output power. If not, continue to adjust. When the next monitoring period arrives, obtain the output voltage, output current, and actual output power of the DC conversion module at the current moment again. If it is monitored that the output voltage of the DC conversion module is less than the preset voltage value of 28V, or when the output current of the DC conversion module is greater than the preset current value of 1A, continue to obtain the voltage change amount of the output voltage at the current moment relative to the preset initial output voltage, and adjust the output current based on the voltage change amount. If the actual output power still does not meet the target output power, continuously monitor the output current, output voltage, and actual output power, and adjust the output current according to the change amount of the current output voltage relative to the preset voltage value. Through multiple monitoring and adjustment processes, gradually make the actual output power of the DC conversion module close to the target output power, that is, the power difference between the actual output power and the target output power is within the preset power error range, and stop the adjustment to make the actual output power meet the user's power consumption requirements.

[0117] In this embodiment, by adjusting the output current through the voltage change amount, and then making the actual power equal to the target output power, the precise regulation of power can also be achieved.

[0118] As Figure 7 shown, in one of the embodiments, the method further includes:

[0119] S500, determine the maximum power current according to the target output power and the preset initial output voltage.

[0120] S800, when the output current is greater than the maximum power current, adjust the output current according to the voltage change amount of the output voltage at the current moment relative to the preset initial output voltage until the power difference between the actual output power and the target output power is within the preset power error range.

[0121] In this embodiment, similarly, after receiving the discharge instruction and extracting the target output power of 200W in the discharge instruction, the maximum power current can be determined based on the target output power of 200W and the preset initial output voltage of 40V, where the maximum power current = 200W / 40V = 5A.

[0122] Subsequently, if it is monitored that the current output current of the DC conversion module is 6A, which is greater than the maximum power current of 5A, calculate the difference between the current output voltage and the preset initial output voltage to obtain the voltage change amount. Then, based on the voltage change amount, complete the regulation of the output current within this cycle. At this time, determine whether the current actual power is equal to the target output power. If not, continue to monitor. When the next monitoring cycle arrives, obtain the output current, output voltage, and actual output power of the DC conversion module at the current moment again. If the output current of the DC conversion module is still greater than 5A, calculate the difference between the current output voltage and the preset initial output voltage to obtain the voltage change amount for this round. Subsequently, based on the voltage change amount for this round, complete the regulation of the output current for this round. Execute the above operations multiple times, continuously monitor the output current, output voltage, and actual output power, and adjust the output current according to the voltage change amount of the current output voltage relative to the preset initial output voltage. Through multiple monitoring and adjustment processes, gradually make the actual output power of the DC conversion module approach the target output power and stop the adjustment.

[0123] In this embodiment, by adjusting the output current through the voltage change amount when it is monitored that the output current is greater than the maximum power current, the power difference between the actual output power and the target output power is within the preset power error range, enabling the photovoltaic energy storage device to operate within the optimal working range and improving the stability and reliability of the device.

[0124] In one of the embodiments, adjusting the output current according to the voltage change amount of the output voltage at the current moment relative to the preset initial output voltage includes: obtaining the third ratio of the voltage change amount to the preset initial output voltage, determining the current adjustment amount according to the third ratio and the preset proportional coefficient, and adjusting the output current according to the voltage change amount and the current adjustment amount.

[0125] Continuing from the previous embodiment, in this embodiment, the method of adjusting the output current based on the voltage change amount can be: obtaining the third ratio of the voltage change amount to the preset initial output voltage of 40V, and then dividing the third ratio by the preset proportional coefficient to obtain the current adjustment amount. Finally, adjust the output current according to the current adjustment amount and the voltage change amount until the power difference between the actual output power and the target output power is within the preset power error range. Specifically, the output current can be increased or decreased according to the magnitude of the voltage change amount.

[0126] In another embodiment, the output current can be adjusted according to whether the voltage change amount is a positive change. Specifically, if the voltage change amount is a positive change amount, the output current is decreased according to the current adjustment amount. If the voltage change amount is a negative change amount, the output current is increased according to the current adjustment amount. It can be understood that when the output voltage is less than the preset voltage value, or the output current is greater than the preset current value, or the output current is greater than the maximum power current, the output current can be adjusted based on the voltage change amount in the above manner.

[0127] Exemplarily, if it is monitored that the output current at the current moment of the DC conversion module is 2 A and the output voltage at the current moment is 42 V during the current monitoring period, such as from the 21st second to the 30th second, and the voltage change amount is a positive change, then the output current = 2 A - (42 V - 40 V) / (40 V / 0.1) = 1.5 A.

[0128] In this embodiment, by adjusting the output current according to the positive and negative changes of the voltage change amount, the photovoltaic energy storage device can approach the optimal working state and provide a stable power output.

[0129] To make a clearer description of the method for adjusting the output power of the photovoltaic energy storage device provided in this application, a specific embodiment and the attached Figure 8 are used for illustration. The power adjustment method of this specific embodiment is to periodically adjust the output voltage based on the current change amount, and then adjust the output power. This specific embodiment includes the following steps:

[0130] S200, Receive a discharge instruction, and the discharge instruction carries the target output power.

[0131] S400, Control the output voltage of the photovoltaic energy storage device to the preset initial output voltage.

[0132] S500, Determine the maximum power current according to the target output power and the preset initial output voltage.

[0133] Specifically, if the target output power is 200 W and the preset initial output voltage is 40 V, then the maximum power current = 200 W / 40 V = 5 A.

[0134] S600, Monitor the output voltage, output current, and actual output power of the photovoltaic energy storage device.

[0135] S820, When the output voltage is less than the preset voltage value, or the output current is greater than the preset current value, adjust the output voltage according to the first current change amount of the output current at the current moment relative to the preset current value until the power difference between the actual output power and the target output power is within the preset power error range.

[0136] Specifically, the output voltage can be adjusted in the following way: obtain the first current change amount of the output current at the current moment relative to the preset current value, compare the first current change amount with the maximum power current, obtain the first ratio of the first current change amount to the maximum power current, then divide the first ratio by the preset proportionality coefficient to obtain the first voltage adjustment amount, and finally, adjust the output voltage according to whether the output current at the current moment is increasing or decreasing compared to the preset current value of 1A.

[0137] Exemplarily, if the current output current is 2A and the current output voltage is 40V, then the first current change amount of the current output current compared to the preset current value of 1A is a positive change, that is, +1A. At this time, it is necessary to reduce the output voltage, and the output voltage = 40V - (2A - 1A) / 5A / 0.1) = 38V.

[0138] S840, when the output current is greater than the maximum power current, adjust the output voltage according to the second current change amount of the output current at the current moment relative to the maximum power current until the power difference between the actual output power and the target output power is within the preset power error range.

[0139] In practical applications, when the light conditions change suddenly or fluctuate greatly, or when the load suddenly increases or a short circuit occurs, or when the photovoltaic energy storage device fails or is damaged, the output current of the photovoltaic energy storage device may instantaneously exceed the maximum power current. At this time, the stability and efficiency of the photovoltaic energy storage device will be affected, and even the device may be damaged.

[0140] Therefore, it is possible to monitor whether the output current of the DC conversion module is greater than the maximum power current of 5 A. If it is monitored that the current output current of the DC conversion module is 6 A, which is greater than the maximum power current of 5 A, calculate the difference between the current output current and the maximum power current to obtain the second current change amount (1 A) of the output current relative to the maximum power current. Subsequently, based on the second current change amount, complete the adjustment of the output voltage in this round. At this time, determine whether the current actual power is equal to the target output power. If not, continue to monitor. When the next monitoring period arrives, obtain the output current, output voltage, and actual output power of the DC conversion module at the current moment again. If the output current of the DC conversion module is still greater than 5 A, calculate the difference between the current output current and the maximum power current to obtain the second current change amount of the output current relative to the maximum power current. Subsequently, based on the second current change amount, complete the adjustment of the output voltage in this round. Execute the above operations multiple times, continuously monitor the output current and output voltage, and adjust the output voltage according to the second current change amount of the current output current relative to the maximum power current. Through multiple monitoring and adjustment processes, gradually make the actual output power of the DC conversion module approach the target output power and stop the adjustment so that the actual output power meets the user's power consumption requirements.

[0141] It should be understood that although the steps in the flowcharts involved in the above-described embodiments are sequentially shown according to the indication of the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless there is a clear indication in this article, the execution of these steps has no strict order limit, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-described embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be executed alternately or alternately with at least a part of other steps or steps or stages in other steps.

[0142] As Figure 9 shown, based on the same inventive concept, the embodiment of the present application also provides a photovoltaic energy storage device power regulation system for implementing the photovoltaic energy storage device power regulation method involved above. The system includes a photovoltaic module 800, a photovoltaic energy storage device 820, and a micro-inverter 840. The photovoltaic module 800 is connected to the photovoltaic energy storage device 820 and the micro-inverter 840.

[0143] The photovoltaic module 800 is a module that converts solar light into electrical energy. Specifically, the photovoltaic module 800 can be, but is not limited to, a photovoltaic array or a photovoltaic panel. The micro-inverter 840 is a small inverter that converts direct current electrical energy into alternating current electrical energy. Compared with traditional large inverters, micro-inverters generally have a smaller size and a lower power output. Specifically, taking the photovoltaic module 800 as a photovoltaic panel as an example, one micro-inverter can be independently connected to each photovoltaic panel.

[0144] The photovoltaic energy storage device 820 is configured to adjust the output power according to the steps in the embodiments of the above-mentioned output power adjustment method of the photovoltaic energy storage device, and discharge to the micro-inverter 840 when receiving a discharge instruction carrying a target output power sent by a client connected through communication.

[0145] Specifically, during implementation, the photovoltaic panel converts sunlight into direct current electrical energy, and the connected micro-inverter 840 converts the direct current electrical energy into alternating current electrical energy. The micro-inverter 840 is connected to the photovoltaic energy storage device 820, and supplies the generated alternating current electrical energy to the photovoltaic energy storage device 820 for storage. When power supply is needed, the user sends a discharge instruction carrying a target output power to the photovoltaic energy storage device 820 through the client. The photovoltaic energy storage device 820 adjusts the output power according to the steps in the embodiments of the above-mentioned output power adjustment method of the photovoltaic energy storage device, discharges to the micro-inverter 840, converts the stored energy into alternating current electrical energy through the micro-inverter 84, and injects it into the power grid or load.

[0146] In the above system, the coordinated operation among various devices enables the photovoltaic power generation system to maximize the utilization of solar energy and provide a stable power supply when needed. Through the cooperation of the photovoltaic module, the photovoltaic energy storage device and the micro-inverter, the system can achieve efficient energy conversion, maximum power point tracking, and the balance of storage and release, thereby improving the performance and reliability of the photovoltaic power generation system.

[0147] Based on the same inventive concept, the embodiments of the present application also provide a device for adjusting the output power of a photovoltaic energy storage device for implementing the above-mentioned output power adjustment method of the photovoltaic energy storage device. The implementation solutions provided by this device to solve problems are similar to those recorded in the above method. Therefore, the specific limitations in one or more embodiments of the following device for adjusting the output power of the photovoltaic energy storage device can refer to the limitations on the output power adjustment method of the photovoltaic energy storage device in the above text, and will not be elaborated here.

[0148] In one embodiment, as Figure 10 shown, a device 900 for adjusting the output power of a photovoltaic energy storage device is provided, including: a data receiving module 910, a voltage control module 920, a data monitoring module 930, and a data adjustment module 940, wherein:

[0149] A data receiving module 99, configured to receive a discharge instruction, where the discharge instruction carries a target output power.

[0150] A voltage control module 920, configured to control the output voltage of the photovoltaic energy storage device to a preset initial output voltage.

[0151] A data monitoring module 930, configured to monitor the output voltage, output current, and actual output power of the photovoltaic energy storage device.

[0152] A data adjustment module 940, configured to, when the output voltage is less than a preset voltage value or the output current is greater than a preset current value, adjust the output voltage according to the current change amount of the output current at the current moment until the power difference between the actual output power and the target output power is within a preset power error range;

[0153] Or, when the output voltage is less than a preset voltage value or the output current is greater than a preset current value, adjust the output current according to the voltage change amount of the output voltage relative to the preset initial output voltage at the current moment until the power difference between the actual output power and the target output power is within a preset power error range.

[0154] In one embodiment, the data adjustment module 940 is further configured to adjust the output voltage according to a first current change amount or a second current change amount of the output current at the current moment, where the first current change amount corresponds to the change amount of the output current relative to the preset current value, and the second current change amount is the change amount of the output current relative to the maximum power current value when the output current is greater than the maximum power current value, and the maximum power current value is greater than the preset current value.

[0155] As Figure 11 shown, in one embodiment, the device further includes a current determination module 922, configured to determine the maximum power current according to the target output power and the preset initial output voltage.

[0156] The data adjustment module 940 is further configured to, when the output current is greater than the maximum power current, obtain a first ratio of the first current change amount to the maximum power current, determine a first voltage adjustment amount according to the first ratio and a preset proportionality coefficient, and adjust the output voltage according to the first current change amount and the first voltage adjustment amount until the power difference between the actual output power and the target output power is within a preset power error range.

[0157] The data adjustment module 940 is further configured to, when the first current change amount is a positive change amount, reduce the output voltage according to the first voltage adjustment amount, and when the first current change amount is a negative change amount, increase the output voltage according to the first voltage adjustment amount.

[0158] In one embodiment, the data regulation module 940 is further configured to obtain a second ratio of the second current change amount to the maximum power current, determine a second voltage regulation amount according to the second ratio and a preset proportionality coefficient, and regulate the output voltage according to the second current change amount and the second voltage regulation amount until the power difference between the actual output power and the target output power is within a preset power error range.

[0159] In one embodiment, the data regulation module 940 is further configured to, when the second current change amount is a positive change amount, reduce the output voltage according to the second voltage regulation amount, and when the second current change amount is a negative change amount, increase the output voltage according to the second voltage regulation amount.

[0160] In one embodiment, the data regulation module 940 is further configured to, when the output voltage is less than a preset voltage value or the output current is greater than a preset current value, regulate the output current according to the voltage change amount of the output voltage at the current moment relative to the preset initial output voltage until the power difference between the actual output power and the target output power is within a preset power error range.

[0161] In one embodiment, the data regulation module 940 is further configured to, when the output current is greater than the maximum power current, regulate the output current according to the voltage change amount of the output voltage at the current moment relative to the preset initial output voltage until the power difference between the actual output power and the target output power is within a preset power error range.

[0162] In one embodiment, the data regulation module 940 is further configured to obtain a third ratio of the voltage change amount to the preset initial output voltage, determine a current regulation amount according to the third ratio and a preset proportionality coefficient, and regulate the output current according to the voltage change amount and the current regulation amount.

[0163] In one embodiment, the data regulation module 940 is further configured to, when the voltage change amount is a positive change amount, reduce the output current according to the current regulation amount, and when the voltage change amount is a negative change amount, increase the output current according to the current regulation amount.

[0164] Each module in the above photovoltaic energy storage device power regulation device can be implemented in whole or in part by software, hardware, and their combination. The above-mentioned modules can be embedded in the processor of the computer device in the form of hardware or be independent of it, or be stored in the memory of the computer device in the form of software, so as to facilitate the processor to call and execute the operations corresponding to the above-mentioned modules.

[0165] Such as Figure 12As shown, in one embodiment, a photovoltaic energy storage device is provided. This photovoltaic energy storage device includes a memory 1110, a controller 1120, and a DC conversion module 1130. The controller 1120 is connected to the memory 1110 and the DC conversion module 1130, and the memory 1110 stores a computer program.

[0166] In this embodiment, the DC conversion module 1130 can be a buck-boost DC / DC module. The controller 1120 can be an MCU.

[0167] The controller is used to monitor the output voltage, output current, and actual output power of the DC conversion module 1130. When receiving a discharge instruction carrying a target output power sent by a client connected through communication, it executes the computer program, adjusts the actual output power of the DC conversion module 1130 according to the steps in the above embodiments of the output power adjustment method for the photovoltaic energy storage device, and discharges to an externally connected micro-inverter. For the specific output power adjustment process, refer to the content in the above embodiments of the output power adjustment method for the photovoltaic energy storage device, which will not be elaborated here.

[0168] In another embodiment, the photovoltaic energy storage device further includes a power management module. The power management control module is respectively connected to the DC / DC module and the MCU. The battery management control module is mainly used to manage and monitor the battery pack in the energy storage device. The buck-boost DC / DC module is used to raise or lower the voltage of the DC power supply in the energy storage device to a voltage level suitable for specific applications. The MCU of the energy storage device is usually used to control and manage all aspects of the energy storage system, including functions such as battery management, charge and discharge control, communication interface, data acquisition and processing, etc. It can monitor and control the state of the energy storage system and execute various algorithms and logics to achieve the safe and efficient operation of the energy storage system.

[0169] Those skilled in the art can understand that Figure 12 the structure shown is only a block diagram of some structures related to the solution of this application, and does not constitute a limitation on the computer device to which the solution of this application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine some components, or have different component arrangements.

[0170] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above embodiments of the output power adjustment method for the photovoltaic energy storage device are implemented.

[0171] In one embodiment, a computer program product is provided, including a computer program. When the computer program is executed by a processor, the steps in the above embodiments of the output power adjustment method for the photovoltaic energy storage device are implemented.

[0172] It should be noted that the data involved in this application (including but not limited to the data for analysis, stored data, displayed data, etc.) are all information and data authorized by users or fully authorized by all parties, and the collection, use, and processing of relevant data need to comply with the relevant laws, regulations, and standards of relevant countries and regions.

[0173] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, database, or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memories. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The databases involved in the embodiments provided in this application can include at least one of relational databases and non-relational databases. Non-relational databases can include distributed databases based on blockchain, etc., and are not limited thereto. The processors involved in the embodiments provided in this application can be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, data processing logics based on quantum computing, etc., and are not limited thereto.

[0174] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0175] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims

1. A method for adjusting the output power of a photovoltaic energy storage device, characterized in that A controller applied to a photovoltaic energy storage device, the method comprising: Receiving a discharge instruction, the discharge instruction carrying a target output power; Controlling the output voltage of the photovoltaic energy storage device to a preset initial output voltage; When the output voltage is less than a preset voltage value or the output current is greater than a preset current value, adjusting the output voltage according to the current change amount of the output current at the current moment until the power difference between the actual output power and the target output power is within a preset power difference error range.

2. The method for adjusting the output power of the photovoltaic energy storage device according to claim 1, wherein The adjusting the output voltage according to the current change amount of the output current at the current moment comprises: Adjusting the output voltage according to a first current change amount or a second current change amount of the output current at the current moment; Wherein, the first current change amount corresponds to the change amount of the output current relative to the preset current value, and the second current change amount is the change amount of the output current relative to the maximum power current value when the output current is greater than the maximum power current value, and the maximum power current value is greater than the preset current value.

3. The method for regulating the output power of the photovoltaic energy storage device according to claim 2, wherein Adjusting the output voltage according to the first current change amount or the second current change amount of the output current at the current moment comprises: Determining a maximum power current according to the target output power and the preset initial output voltage; Obtaining a first ratio of the first current change amount to the maximum power current, or obtaining a second ratio of the second current change amount to the maximum power current; Determining a first voltage adjustment amount according to the first ratio and a preset proportionality coefficient, or determining a second voltage adjustment amount according to the second ratio and the preset proportionality coefficient; Adjusting the output voltage according to the first current change amount and the first voltage adjustment amount, or adjusting the output voltage according to the second current change amount and the second voltage adjustment amount.

4. The method for adjusting the output power of the photovoltaic energy storage device according to claim 3, wherein The adjusting the output voltage according to the first current change amount and the first voltage adjustment amount comprises: When the first current change amount is a positive change amount, reducing the output voltage according to the first voltage adjustment amount; When the first current change amount is a negative change amount, increasing the output voltage according to the first voltage adjustment amount; Or, Adjusting the output voltage according to the second current change amount and the second voltage adjustment amount comprises: When the second current change amount is a positive change amount, reducing the output voltage according to the second voltage adjustment amount; When the second current change amount is a negative change amount, increasing the output voltage according to the second voltage adjustment amount.

5. A method for regulating the output power of a photovoltaic energy storage device, characterized in that, A controller applied to a photovoltaic energy storage device, the method comprising: Receiving a discharge instruction, the discharge instruction carrying a target output power; Controlling the output voltage of the photovoltaic energy storage device to a preset initial output voltage; When the output voltage is less than a preset voltage value or the output current is greater than a preset current value, adjusting the output current according to the voltage change amount of the output voltage relative to the preset initial output voltage at the current moment until the power difference between the actual output power and the target output power is within a preset power difference error range.

6. The method for regulating the output power of the photovoltaic energy storage device according to claim 5, wherein, The method further comprises: Determine the maximum power current according to the target output power and the preset initial output voltage; When the output current is greater than the maximum power current, adjust the output current according to the voltage change amount of the output voltage relative to the preset initial output voltage at the current moment until the power difference between the actual output power and the target output power is within the preset power difference error range.

7. The method for regulating the output power of the photovoltaic energy storage device according to claim 5 or 6, characterized in that, The adjusting the output current according to the voltage change amount of the output voltage relative to the preset initial output voltage at the current moment includes: Obtain a third ratio of the voltage change amount to the preset initial output voltage; Determine a current adjustment amount according to the third ratio and a preset proportionality coefficient; Adjust the output current according to the voltage change amount and the current adjustment amount.

8. The method for adjusting the output power of the photovoltaic energy storage device according to claim 7, characterized in that, The adjusting the output current according to the voltage change amount and the current adjustment amount includes: When the voltage change amount is a positive change amount, reduce the output current according to the current adjustment amount; When the voltage change amount is a negative change amount, increase the output current according to the current adjustment amount.

9. A power regulation system for a photovoltaic energy storage device, characterized in that, The system includes: a photovoltaic module, a photovoltaic energy storage device, and a micro-inverter, and the photovoltaic module is connected to the micro-inverter and the photovoltaic energy storage device; The photovoltaic energy storage device is configured to, when receiving a discharge instruction carrying a target output power sent by a client with a communication connection, adjust the output power according to the photovoltaic energy storage device output power adjustment method according to any one of claims 1 to 8, and discharge to the micro-inverter.

10. A photovoltaic energy storage device, comprising a memory, a controller, and a DC conversion module, the controller is connected to the memory and the DC conversion module, and the memory stores a computer program, and is characterized in that: The controller is configured to monitor the output voltage, output current, and actual output power of the DC conversion module, and when receiving a discharge instruction carrying a target output power, execute the computer program, and adjust the actual output power of the DC conversion module according to the photovoltaic energy storage device output power adjustment method according to any one of claims 1 to 8.

Images