Power control method and device of optical storage system
By employing a power control method based on real-time monitoring and gradient adjustment, the problems of overcurrent during charging and discharging and transformer overload in photovoltaic and energy storage systems have been solved, achieving stable operation and efficient utilization of the system.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-31
- Publication Date
- 2026-04-07
AI Technical Summary
Photovoltaic systems and energy storage systems have problems with charging overcurrent and transformer overload, especially in factories or industrial parks. When photovoltaic power generation is at full power and energy storage is at full power discharge, it can easily lead to backfeeding and transformer overload.
By monitoring the charging and discharging status of the photovoltaic-storage system and the power value at the grid connection point in real time, the charging and discharging power of the energy storage system is controlled by a gradient adjustment method to ensure that it is within a reasonable range and to avoid transformer overload and reverse power transmission.
Prioritizing photovoltaic power generation avoids power fluctuations and transformer overload caused by the charging and discharging of the energy storage system, thus improving the system's stability and efficiency.
Smart Images
Figure CN121813645A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of photovoltaic energy storage system technology, and in particular to a power control method and apparatus for a photovoltaic energy storage system. Background Technology
[0002] A photovoltaic (PV) and energy storage system consists of a photovoltaic (PV) system and an energy storage system. The PV system is not directly connected to the grid, but rather connected to the DC side of the energy storage system. The energy storage system then connects to the grid via a bidirectional inverter. To maximize the economic benefits of PV, the PV power is charged into the battery during off-peak hours when electricity prices are low, and the electricity is fed into the grid during peak hours, thus maximizing PV revenue. However, prioritizing PV power generation during charging periods can easily lead to overcurrent in the battery.
[0003] Since user-side energy storage is typically built within existing factories or industrial parks, the transformer capacity was not initially designed with energy storage in mind, and subsequent transformer expansion is extremely difficult. When the factory's electricity load is high, full-power charging of the energy storage could overload the transformer. Furthermore, rooftop solar panels are commonly installed within factory areas; when these solar panels are generating electricity at full power, full-power discharging of the energy storage could potentially lead to backfeeding. Summary of the Invention
[0004] In view of this, embodiments of this application provide a power control method for a photovoltaic energy storage system. One or more embodiments of this application also relate to a power control device for a photovoltaic energy storage system, a computing device, a computer-readable storage medium, and a computer program, to address the technical deficiencies existing in the prior art.
[0005] According to a first aspect of the embodiments of this application, a power control method for a photovoltaic energy storage system is provided, comprising: Determine the current charging and discharging state of the photovoltaic-storage system, and set the maximum power generation value of the photovoltaic system in the photovoltaic-storage system; During the current charging and discharging state of the photovoltaic energy storage system, the charging and discharging power values of the energy storage system and the power values of the grid connection point are monitored in real time. The charging and discharging power values of the energy storage system and the power value of the grid connection point are adjusted according to real-time monitoring until the energy storage system reaches the maximum charging and discharging power value.
[0006] Preferably, in the current charging and discharging state of the photovoltaic-energy storage system, real-time monitoring of the charging and discharging power value of the energy storage system and the power value of the grid connection point includes: In the current discharge state of the photovoltaic-storage system, the discharge power value of the energy storage system and the active power value of the grid connection point are monitored in real time. In the current charging state of the photovoltaic energy storage system, the charging power value of the energy storage system and the apparent power value of the grid connection point are monitored in real time.
[0007] Preferably, adjusting the monitored charging / discharging power values of the energy storage system and the power value at the grid connection point until the energy storage system reaches its maximum charging / discharging power value includes: During the process of increasing the charging and discharging power of the energy storage system according to the preset first gradient while the energy storage system is in its current discharge state, the discharge power value of the energy storage system and the active power value of the grid connection point are monitored in real time. A first comparison result is obtained by comparing the real-time monitored discharge power value of the energy storage system with the maximum discharge power value; at the same time, a second comparison result is obtained by comparing the real-time monitored active power value of the grid connection point with a preset reverse power threshold value. Based on the first comparison result and the second comparison result, the discharge power value of the energy storage system and the power value of the grid connection point are adjusted respectively until the energy storage system reaches the maximum discharge power value.
[0008] Preferably, adjusting the discharge power value of the energy storage system and the power value of the grid connection point according to the first comparison result and the second comparison result until the energy storage system reaches the maximum discharge power value includes: If the first comparison result is that the discharge power value of the energy storage system is less than the maximum discharge power value, and the second comparison result is that the active power value of the grid connection point is not greater than the preset reverse power threshold, then the energy storage system is controlled to reduce the discharge power value until the active power value of the grid connection point is greater than the preset reverse power threshold. After the active power value at the grid connection point exceeds the preset reverse power threshold, the energy storage system is controlled to increase the discharge power value until the energy storage system reaches the maximum discharge power value.
[0009] Preferably, adjusting the monitored charging / discharging power values of the energy storage system and the power value at the grid connection point until the energy storage system reaches its maximum charging / discharging power value includes: During the process of increasing the charging power of the energy storage system according to the preset second gradient while the current charging state of the photovoltaic energy storage system is being monitored, the charging power value of the energy storage system and the apparent power value of the grid connection point are monitored in real time. A third comparison result is obtained by comparing the real-time monitored charging power value of the energy storage system with the maximum charging power value; at the same time, a fourth comparison result is obtained by comparing the real-time monitored apparent power value of the grid connection point with the preset transformer overload threshold value. Based on the third comparison result and the fourth comparison result, the charging power value of the energy storage system and the power value of the grid connection point are adjusted respectively until the energy storage system reaches the maximum charging power value.
[0010] Preferably, adjusting the charging power value of the energy storage system and the power value of the grid connection point according to the third comparison result and the fourth comparison result, until the energy storage system reaches the maximum charging power value, includes: If the third comparison result is that the charging power value of the energy storage system is less than the maximum charging power value, and the second comparison result is that the apparent power value of the grid connection point is not less than the preset transformer overload threshold, then the energy storage system is controlled to reduce the charging power value until the apparent power value of the grid connection point is less than the preset transformer overload threshold. When the apparent power value at the grid connection point is less than the preset transformer overload threshold, the energy storage system is controlled to increase the charging power value until the energy storage system reaches the maximum charging power value.
[0011] Preferably, after the current charging state of the photovoltaic energy storage system, the system further includes: The system monitors the actual power generation of the photovoltaic system during the current charging period in real time and adjusts the maximum charging power of the energy storage system in real time based on the actual power generation of the photovoltaic system.
[0012] According to a second aspect of the embodiments of this application, a power control device for a photovoltaic energy storage system is provided, comprising: The determination and setting module is configured to determine the current charging and discharging state of the photovoltaic energy storage system and set the maximum power generation value of the photovoltaic system in the photovoltaic energy storage system. The monitoring module is configured to monitor the charging and discharging power value of the energy storage system and the power value of the grid connection point in real time, respectively, when the photovoltaic energy storage system is currently in the charging and discharging state. The control module is configured to adjust the real-time monitored charging and discharging power values of the energy storage system and the power value of the grid connection point until the energy storage system reaches the maximum charging and discharging power value.
[0013] According to a third aspect of the embodiments of this application, a computing device is provided, comprising: Memory and processor; The memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions to implement any of the steps of the power control method of the optical energy storage system.
[0014] According to a fourth aspect of the present application, a computer-readable storage medium is provided that stores computer-executable instructions, which, when executed by a processor, implement the steps of the power control method of any one of the optical storage systems.
[0015] According to a fifth aspect of the present application, a computer program is provided, wherein when the computer program is executed in a computer, it causes the computer to perform the steps of the power control method of the above-described optical storage system.
[0016] The power control scheme for the photovoltaic-storage system provided in this application embodiment determines the current charging and discharging state of the photovoltaic-storage system and sets the maximum power generation value of the photovoltaic system within the system. During the current charging and discharging state, the charging and discharging power values of the energy storage system and the power value at the grid connection point are monitored in real time. Adjustments are made to the real-time monitored charging and discharging power values of the energy storage system and the power value at the grid connection point until the energy storage system reaches its maximum charging and discharging power value. By monitoring the power information at the grid connection point in real time, the output of the energy storage system is adjusted to keep the power of the energy storage system within a reasonable range, avoiding transformer overload and backfeeding. Secondly, to avoid drastic fluctuations in the grid connection point power caused by energy storage charging and discharging, the power of the energy storage system is increased and decreased in a step-by-step manner. Finally, photovoltaic power generation is prioritized, so during the charging period, to avoid overcurrent during charging, the power consumption control system (PCS) needs to be adjusted according to the photovoltaic power generation. Attached Figure Description
[0017] Figure 1 This is a flowchart of a power control method for a photovoltaic energy storage system provided in one embodiment of this application; Figure 2 This is an overall flowchart of a power control method for a photovoltaic energy storage system during the discharge period provided in one embodiment of this application; Figure 3 This is an overall flowchart of a power control method for a photovoltaic energy storage system during the charging period provided in one embodiment of this application; Figure 4 This is a schematic diagram of a power control device for a photovoltaic energy storage system provided in one embodiment of this application; Figure 5 This is a structural block diagram of a computing device provided in one embodiment of this application. Detailed Implementation
[0018] Many specific details are set forth in the following description to provide a full understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of this application; therefore, this application is not limited to the specific embodiments disclosed below.
[0019] The terminology used in one or more embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the scope of one or more embodiments of this application. The singular forms “a,” “the,” and “the” used in one or more embodiments of this application and in the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” used in one or more embodiments of this application refers to and includes any or all possible combinations of one or more associated listed items.
[0020] It should be understood that although the terms first, second, etc., may be used to describe various information in one or more embodiments of this application, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, first may also be referred to as second without departing from the scope of one or more embodiments of this application, and similarly, second may also be referred to as first. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to a determination."
[0021] This application provides a power control method for a photovoltaic energy storage system. This application also relates to a power control device for a photovoltaic energy storage system, a computing device, a computer-readable storage medium, and a computer program, which will be described in detail in the following embodiments.
[0022] Figure 1 A flowchart of a power control method for a photovoltaic energy storage system according to an embodiment of this application is shown, which specifically includes the following steps.
[0023] Step S101: Determine the current charging and discharging state of the photovoltaic-storage system, and set the maximum power generation value of the photovoltaic system in the photovoltaic-storage system; It should be noted that, regardless of whether the battery is discharging or charging, setting the DC-DC converter to the maximum charging power limit of the battery is intended to prevent overcharging.
[0024] Step S102: In the current charging and discharging state of the photovoltaic energy storage system, monitor the charging and discharging power value of the energy storage system and the power value of the grid connection point in real time. In one embodiment of this application, real-time monitoring of the charging / discharging power value of the energy storage system and the power value of the grid connection point, respectively, during the current charging / discharging state of the photovoltaic-energy storage system, includes: In the current discharge state of the photovoltaic-storage system, the discharge power value of the energy storage system and the active power value of the grid connection point are monitored in real time. In the current charging state of the photovoltaic energy storage system, the charging power value of the energy storage system and the apparent power value of the grid connection point are monitored in real time.
[0025] Step S103: Adjust the real-time monitored charging and discharging power values of the energy storage system and the power value of the grid connection point until the energy storage system reaches the maximum charging and discharging power value.
[0026] In one embodiment of this application, adjusting the monitored charging and discharging power values of the energy storage system and the power value at the grid connection point until the energy storage system reaches its maximum charging and discharging power value includes: During the process of increasing the charging and discharging power of the energy storage system according to the preset first gradient while the energy storage system is in its current discharge state, the discharge power value of the energy storage system and the active power value of the grid connection point are monitored in real time. A first comparison result is obtained by comparing the real-time monitored discharge power value of the energy storage system with the maximum discharge power value; at the same time, a second comparison result is obtained by comparing the real-time monitored active power value of the grid connection point with a preset reverse power threshold value. Based on the first comparison result and the second comparison result, the discharge power value of the energy storage system and the power value of the grid connection point are adjusted respectively until the energy storage system reaches the maximum discharge power value.
[0027] In one embodiment of this application, adjusting the discharge power value of the energy storage system and the power value of the grid connection point based on the first comparison result and the second comparison result until the energy storage system reaches the maximum discharge power value includes: If the first comparison result is that the discharge power value of the energy storage system is less than the maximum discharge power value, and the second comparison result is that the active power value of the grid connection point is not greater than the preset reverse power threshold, then the energy storage system is controlled to reduce the discharge power value until the active power value of the grid connection point is greater than the preset reverse power threshold. After the active power value at the grid connection point exceeds the preset reverse power threshold, the energy storage system is controlled to increase the discharge power value until the energy storage system reaches the maximum discharge power value.
[0028] In one embodiment of this application, adjusting the monitored charging / discharging power value of the energy storage system and the power value at the grid connection point until the energy storage system reaches the maximum charging / discharging power value includes: During the process of increasing the charging power of the energy storage system according to the preset second gradient while the current charging state of the photovoltaic energy storage system is being monitored, the charging power value of the energy storage system and the apparent power value of the grid connection point are monitored in real time. A third comparison result is obtained by comparing the real-time monitored charging power value of the energy storage system with the maximum charging power value; at the same time, a fourth comparison result is obtained by comparing the real-time monitored apparent power value of the grid connection point with the preset transformer overload threshold value. Based on the third comparison result and the fourth comparison result, the charging power value of the energy storage system and the power value of the grid connection point are adjusted respectively until the energy storage system reaches the maximum charging power value.
[0029] In one embodiment of this application, adjusting the charging power value of the energy storage system and the power value of the grid connection point according to the third comparison result and the fourth comparison result, until the energy storage system reaches the maximum charging power value, includes: If the third comparison result is that the charging power value of the energy storage system is less than the maximum charging power value, and the second comparison result is that the apparent power value of the grid connection point is not less than the preset transformer overload threshold, then the energy storage system is controlled to reduce the charging power value until the apparent power value of the grid connection point is less than the preset transformer overload threshold. When the apparent power value at the grid connection point is less than the preset transformer overload threshold, the energy storage system is controlled to increase the charging power value until the energy storage system reaches the maximum charging power value.
[0030] In one embodiment of this application, after the current charging state of the photovoltaic energy storage system, the method further includes: real-time monitoring of the actual power generation value of the photovoltaic system during the current charging period, and real-time adjustment of the maximum charging power value of the energy storage system based on the actual power generation value of the photovoltaic system.
[0031] The power control scheme for the photovoltaic-storage system provided in this application's embodiments monitors real-time power information such as active power, reactive power, apparent power, and power factor at the grid connection point, and adjusts the energy storage output in real time to keep the energy storage power within a reasonable range, avoiding transformer overload and backfeed. To prevent drastic fluctuations in grid connection power caused by energy storage charging and discharging, the energy storage power is increased and decreased in a step-by-step manner. Photovoltaic power generation is prioritized, so during charging periods, to avoid overcurrent during charging, the PCS (Power Conversion System, energy storage converter) needs to be adjusted according to the photovoltaic power generation.
[0032] Figure 2 This is an overall flowchart of a power control method for a photovoltaic energy storage system during the discharge period, provided in one embodiment of this application. Figure 2 As shown, it includes: Step 2.1: When the photovoltaic-energy storage system is in the discharge period, the energy storage system will first enter the discharge mode.
[0033] Step 2.2: Prioritize photovoltaic system power generation and set the maximum power output of the DC-DC converter to the current maximum charging power of the battery.
[0034] Step 2.3: In order to avoid drastic fluctuations in the power at the grid connection point caused by changes in energy storage power, the energy storage system will gradually increase the power to the set maximum discharge power in a step-by-step manner.
[0035] Step 2.4: As the energy storage system gradually increases its power in a step-by-step manner, the active power at the grid connection point will be monitored simultaneously.
[0036] If the plant's power load decreases at this time, and the active power at the grid connection point drops to the reverse power threshold, in order to prevent reverse power transmission, the energy storage system will gradually reduce the discharge power until the active power at the grid connection point is greater than the reverse power threshold.
[0037] Step 2.5: When the active power at the grid connection point recovers (i.e., the active power at the grid connection point is greater than the reverse power threshold), the energy storage power will continue to gradually increase until the maximum discharge power.
[0038] Figure 3 This is an overall flowchart of a power control method for a photovoltaic energy storage system during the charging period, provided in one embodiment of this application. Figure 3 As shown, it includes: Step 3.1: When the photovoltaic-storage system is in the charging period, the energy storage system will first enter the charging mode.
[0039] Step 3.2: Prioritize photovoltaic system power generation and set the maximum power output of the DC-DC converter to the current maximum charging power of the battery.
[0040] Step 3.3: To avoid overcurrent during battery charging, the PCS is adjusted according to the actual power generation of the DC-DC converter. PCS power = maximum battery charging power - actual DC-DC power generation. Here, the actual DC-DC power generation is the photovoltaic power generation, which is affected by factors such as sunlight and weather conditions.
[0041] Step 3.4: In order to avoid drastic fluctuations in grid connection power caused by changes in energy storage power, the energy storage power will be gradually increased to the set maximum charging power in a step-by-step manner.
[0042] Step 3.5: As the energy storage system gradually increases its power in a step-by-step manner, the apparent power at the grid connection point will be monitored simultaneously.
[0043] If the plant's power load increases at this time, and the apparent power at the grid connection point rises to the transformer overload threshold, the transformer overload will occur. The energy storage system will gradually reduce the charging power until the apparent power at the grid connection point is less than the transformer overload threshold.
[0044] Step 3.6: When the apparent power at the grid connection point is less than the transformer overload threshold, the energy storage power will continue to gradually increase until the maximum charging power.
[0045] This application, while determining the current charging and discharging state of the photovoltaic-storage system and setting the maximum power generation value of the photovoltaic system in the photovoltaic-storage system, also includes an operation step of power allocation for each energy storage unit in the energy storage power station. Specifically, this includes: determining the charging and discharging mode of each energy storage unit in the large-scale energy storage power station according to the overall target instruction; collecting the charging and discharging information of each energy storage unit according to the charging and discharging mode of each energy storage unit in the large-scale energy storage power station, and determining whether each energy storage unit meets the charging and discharging power allocation operation conditions under the overall target instruction based on the charging and discharging information of each energy storage unit; when it is determined that each energy storage unit meets the charging and discharging power allocation operation conditions under the overall target instruction, calculating the charging and discharging power value of each energy storage unit sequentially according to the charging and discharging information of each energy storage unit and the overall target instruction, and sending the calculated charging and discharging power value to the corresponding energy storage unit to achieve power allocation in the large-scale energy storage power station.
[0046] Specifically, determining the charging and discharging mode of each energy storage unit in the large-scale energy storage power station according to the overall target instruction includes: comparing the overall target power value in the overall target instruction with 0; if the overall target power value in the overall target instruction is greater than 0, then each energy storage unit in the large-scale energy storage power station is determined to be in discharge mode; if the overall target power value in the overall target instruction is less than 0, then each energy storage unit in the large-scale energy storage power station is determined to be in charging mode.
[0047] Furthermore, based on the charging and discharging modes of each energy storage unit in the large-scale energy storage power station, charging and discharging information of each energy storage unit is collected. Based on this information, determining whether each energy storage unit meets the charging and discharging power allocation operation conditions under the overall target command includes: when it is determined that each energy storage unit in the large-scale energy storage power station is in discharge mode, collecting discharge information for each energy storage unit including equipment status, discharge SOC value, and discharge power limit value; when the equipment status in the discharge information of each energy storage unit is in discharge operation mode, the discharge SOC value is greater than the preset lower limit value, and the discharge power limit value is greater than 0, then determining whether each energy storage unit meets the charging and discharging power allocation operation conditions under the overall target command. The energy storage unit meets the discharge power allocation operation conditions; if the device status in the discharge information of any energy storage unit is not in the discharge operation state, the discharge SOC value is greater than the preset lower limit of SOC and the discharge power limit value is greater than 0, or if the device status in the discharge information of any energy storage unit is in the discharge operation state, the discharge SOC value is not greater than the preset lower limit of SOC and the discharge power limit value is greater than 0, or if the device status in the discharge information of any energy storage unit is in the discharge operation state, the discharge SOC value is greater than the preset lower limit of SOC and the discharge power limit value is not greater than 0, then it is determined that each energy storage unit does not meet the discharge power allocation operation conditions under the overall target instruction.
[0048] The process of collecting charging and discharging information for each energy storage unit in the large-scale energy storage power station, based on the charging and discharging modes of each unit, and determining whether each unit meets the charging and discharging power allocation operation conditions under the overall target command, includes: when it is determined that each energy storage unit in the large-scale energy storage power station is in charging mode, collecting charging information for each unit, including device status, charging SOC value, and charging power limit value; when the device status in the charging information of each energy storage unit is in charging operation mode, the charging SOC value is less than the preset SOC upper limit value, and the charging power limit value is greater than 0, then determining whether each energy storage unit meets the charging and discharging power allocation operation conditions under the overall target command. The unit meets the charging power allocation operation conditions; if the device status in the charging information of any energy storage unit is not in the charging operation state, the charging SOC value is less than the preset SOC upper limit value and the charging power limit value is greater than 0, or if the device status in the charging information of any energy storage unit is in the charging operation state, the charging SOC value is not less than the preset SOC upper limit value and the charging power limit value is greater than 0, or if the device status in the charging information of any energy storage unit is in the charging operation state, the charging SOC value is less than the preset SOC upper limit value and the charging power limit value is not greater than 0, then it is determined that each energy storage unit does not meet the charging power allocation operation conditions under the overall target instruction.
[0049] Further, when it is determined that each energy storage unit meets the charging and discharging power allocation operation conditions under the overall target instruction, the charging and discharging power value of each energy storage unit is calculated sequentially based on the charging and discharging information of each energy storage unit and the overall target instruction. This includes: when it is determined that each energy storage unit meets the discharging power allocation operation conditions under the overall target instruction, the discharging power allocation weight of each energy storage unit is calculated sequentially based on the discharging SOC value in the discharging information of each energy storage unit; when allocating the discharging power value of the current energy storage unit, the current remaining available discharging power value in the overall target instruction is calculated based on the overall target power value in the overall target instruction and the discharging power value already allocated to the previous energy storage units; the discharging power value to be allocated of the current energy storage unit is calculated based on the discharging power allocation weight of the current energy storage unit and the current remaining available discharging power value, and the discharging power value to be allocated of the current energy storage unit is compared with a preset discharging power limit value, and the smaller value is selected as the discharging power value of the current energy storage unit.
[0050] Specifically, when it is determined that each energy storage unit meets the charging and discharging power allocation operation conditions under the overall target instruction, the charging and discharging power value of each energy storage unit is calculated sequentially based on the charging and discharging information of each energy storage unit and the overall target instruction. This includes: when it is determined that each energy storage unit meets the charging power allocation operation conditions under the overall target instruction, calculating the charging power allocation weight of each energy storage unit sequentially based on the charging SOC value in the charging information of each energy storage unit; when allocating charging power value to the current energy storage unit, calculating the current remaining available charging power value in the overall target instruction based on the overall target power value in the overall target instruction and the charging power values already allocated to the previous energy storage units; calculating the charging power value to be allocated to the current energy storage unit based on the charging power allocation weight of the current energy storage unit and the current remaining available charging power value, and comparing the charging power value to be allocated to the current energy storage unit with a preset charging power limit value, selecting the larger value as the charging power value of the current energy storage unit.
[0051] The embodiments of this application further include: when it is determined that any energy storage unit does not meet the charging and discharging power allocation operation conditions under the overall target command, the charging and discharging power value is set to 0 and sent to the energy storage unit that does not meet the charging and discharging power allocation operation conditions.
[0052] Figure 4 This is a schematic diagram of a power control device for a photovoltaic energy storage system according to an embodiment of this application, as shown below. Figure 4 As shown, the device includes: The determination and setting module is configured to determine the current charging and discharging state of the photovoltaic energy storage system and set the maximum power generation value of the photovoltaic system in the photovoltaic energy storage system. The monitoring module is configured to monitor the charging and discharging power value of the energy storage system and the power value of the grid connection point in real time, respectively, when the photovoltaic energy storage system is currently in the charging and discharging state. The control module is configured to adjust the real-time monitored charging and discharging power values of the energy storage system and the power value of the grid connection point until the energy storage system reaches the maximum charging and discharging power value.
[0053] The above is a schematic scheme of a power control device for a photovoltaic energy storage system according to this embodiment. It should be noted that the technical solution of the power control device for the photovoltaic energy storage system and the technical solution of the power control method for the photovoltaic energy storage system described above belong to the same concept. For details not described in detail in the technical solution of the power control device for the photovoltaic energy storage system, please refer to the description of the technical solution of the power control method for the photovoltaic energy storage system described above.
[0054] Figure 5 A structural block diagram of a computing device 500 according to an embodiment of this application is shown. The components of the computing device 500 include, but are not limited to, a memory 510 and a processor 520. The processor 520 is connected to the memory 510 via a bus 530, and a database 540 is used to store data.
[0055] The computing device 500 also includes an access device 540, which enables the computing device 500 to communicate via one or more networks 560. Examples of these networks include a Public Switched Telephone Network (PSTN), a Local Area Network (LAN), a Wide Area Network (WAN), a Personal Area Network (PAN), or a combination of communication networks such as the Internet. The access device 540 may include one or more of any type of wired or wireless network interface (e.g., a Network Interface Card (NIC)), such as an IEEE 802.11 Wireless Local Area Network (WLAN) interface, a Wi-MAX interface, an Ethernet interface, a Universal Serial Bus (USB) interface, a cellular network interface, a Bluetooth interface, a Near Field Communication (NFC) interface, and so on.
[0056] In one embodiment of this application, the aforementioned components of the computing device 500 and Figure 5 Other components, not shown, can also be connected to each other, for example, via a bus. It should be understood that... Figure 5 The block diagram of the computing device shown is for illustrative purposes only and is not intended to limit the scope of this application. Those skilled in the art can add or replace other components as needed.
[0057] The computing device 500 can be any type of stationary or mobile computing device, including mobile computers or mobile computing devices (e.g., tablet computers, personal digital assistants, laptop computers, notebook computers, netbooks, etc.), mobile phones (e.g., smartphones), wearable computing devices (e.g., smartwatches, smart glasses, etc.) or other types of mobile devices, or stationary computing devices such as desktop computers or PCs. The computing device 500 can also be a mobile or stationary server.
[0058] The processor 520 is configured to execute the following computer-executable instructions, which, when executed by the processor, implement the steps of the power control method for the aforementioned optical storage system.
[0059] The above is a schematic representation of a computing device according to this embodiment. It should be noted that the technical solution of this computing device and the power control method for the aforementioned photovoltaic-storage system belong to the same concept. Details not described in detail in the technical solution of the computing device can be found in the description of the power control method for the aforementioned photovoltaic-storage system.
[0060] An embodiment of this application also provides a computer-readable storage medium storing computer-executable instructions that, when executed by a processor, implement the steps of the power control method for the aforementioned optical storage system.
[0061] The above is an illustrative scheme of a computer-readable storage medium according to this embodiment. It should be noted that the technical solution of this storage medium and the technical solution of the power control method of the optical storage system described above belong to the same concept. For details not described in detail in the technical solution of the storage medium, please refer to the description of the technical solution of the power control method of the optical storage system described above.
[0062] An embodiment of this application also provides a computer program, wherein when the computer program is executed in a computer, it causes the computer to perform the steps of the power control method of the above-described optical storage system.
[0063] The above is an illustrative scheme of a computer program according to this embodiment. It should be noted that the technical solution of this computer program and the power control method of the photovoltaic energy storage system described above belong to the same concept. For details not described in detail in the technical solution of the computer program, please refer to the description of the power control method of the photovoltaic energy storage system described above.
[0064] The foregoing has described specific embodiments of this application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in a different order than that shown in the embodiments and may still achieve the desired results. Furthermore, the processes depicted in the drawings do not necessarily require the specific or sequential order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.
[0065] The computer instructions include computer program code, which may be in the form of source code, object code, executable file, or certain intermediate forms. The computer-readable medium may include any entity or device capable of carrying the computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the content included in the computer-readable medium may be appropriately added to or subtracted according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media may not include electrical carrier signals and telecommunication signals.
[0066] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that the embodiments of this application are not limited to the described order of actions, because according to the embodiments of this application, some steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also understand that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to the embodiments of this application.
[0067] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.
[0068] The preferred embodiments disclosed above are merely illustrative of this application. The optional embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the embodiments of this application. These embodiments are selected and specifically described in this application to better explain the principles and practical applications of the embodiments of this application, thereby enabling those skilled in the art to better understand and utilize this application. This application is limited only by the claims and their full scope and equivalents.
Claims
1. A power control method for a photovoltaic-storage system, characterized in that, include: Determine the current charging and discharging state of the photovoltaic-storage system, and set the maximum power generation value of the photovoltaic system in the photovoltaic-storage system; During the current charging and discharging state of the photovoltaic energy storage system, the charging and discharging power values of the energy storage system and the power values of the grid connection point are monitored in real time. The charging and discharging power values of the energy storage system and the power value of the grid connection point are adjusted according to real-time monitoring until the energy storage system reaches the maximum charging and discharging power value.
2. The battery swapping method according to claim 1, characterized in that, In the current charging and discharging state of the photovoltaic-energy storage system, real-time monitoring of the charging and discharging power values of the energy storage system and the power values at the grid connection point includes: In the current discharge state of the photovoltaic-storage system, the discharge power value of the energy storage system and the active power value of the grid connection point are monitored in real time. In the current charging state of the photovoltaic energy storage system, the charging power value of the energy storage system and the apparent power value of the grid connection point are monitored in real time.
3. The battery swapping method according to claim 2, characterized in that, By adjusting the monitored charging and discharging power values of the energy storage system and the power value at the grid connection point until the energy storage system reaches its maximum charging and discharging power value, the following steps are taken: During the process of increasing the charging and discharging power of the energy storage system according to the preset first gradient while the energy storage system is in its current discharge state, the discharge power value of the energy storage system and the active power value of the grid connection point are monitored in real time. A first comparison result is obtained by comparing the real-time monitored discharge power value of the energy storage system with the maximum discharge power value; at the same time, a second comparison result is obtained by comparing the real-time monitored active power value of the grid connection point with a preset reverse power threshold value. Based on the first comparison result and the second comparison result, the discharge power value of the energy storage system and the power value of the grid connection point are adjusted respectively until the energy storage system reaches the maximum discharge power value.
4. The battery swapping method according to claim 3, characterized in that, Based on the first comparison result and the second comparison result, the discharge power value of the energy storage system and the power value of the grid connection point are adjusted respectively until the energy storage system reaches the maximum discharge power value, including: If the first comparison result is that the discharge power value of the energy storage system is less than the maximum discharge power value, and the second comparison result is that the active power value of the grid connection point is not greater than the preset reverse power threshold, then the energy storage system is controlled to reduce the discharge power value until the active power value of the grid connection point is greater than the preset reverse power threshold. After the active power value at the grid connection point exceeds the preset reverse power threshold, the energy storage system is controlled to increase the discharge power value until the energy storage system reaches the maximum discharge power value.
5. The battery swapping method according to claim 2, characterized in that, By adjusting the monitored charging and discharging power values of the energy storage system and the power value at the grid connection point until the energy storage system reaches its maximum charging and discharging power value, the following steps are taken: During the process of increasing the charging power of the energy storage system according to the preset second gradient while the current charging state of the photovoltaic energy storage system is being monitored, the charging power value of the energy storage system and the apparent power value of the grid connection point are monitored in real time. A third comparison result is obtained by comparing the real-time monitored charging power value of the energy storage system with the maximum charging power value; at the same time, a fourth comparison result is obtained by comparing the real-time monitored apparent power value of the grid connection point with the preset transformer overload threshold value. Based on the third comparison result and the fourth comparison result, the charging power value of the energy storage system and the power value of the grid connection point are adjusted respectively until the energy storage system reaches the maximum charging power value.
6. The battery swapping method according to claim 5, characterized in that, Based on the third comparison result and the fourth comparison result, the charging power value of the energy storage system and the power value of the grid connection point are adjusted respectively until the energy storage system reaches the maximum charging power value, including: If the third comparison result is that the charging power value of the energy storage system is less than the maximum charging power value, and the second comparison result is that the apparent power value of the grid connection point is not less than the preset transformer overload threshold, then the energy storage system is controlled to reduce the charging power value until the apparent power value of the grid connection point is less than the preset transformer overload threshold. When the apparent power value at the grid connection point is less than the preset transformer overload threshold, the energy storage system is controlled to increase the charging power value until the energy storage system reaches the maximum charging power value.
7. The battery swapping method according to claim 5, characterized in that, Following the current charging state of the photovoltaic energy storage system, the system further includes: The system monitors the actual power generation of the photovoltaic system during the current charging period in real time and adjusts the maximum charging power of the energy storage system in real time based on the actual power generation of the photovoltaic system.
8. A power control device for a photovoltaic energy storage system, characterized in that, include: The determination and setting module is configured to determine the current charging and discharging state of the photovoltaic energy storage system and set the maximum power generation value of the photovoltaic system in the photovoltaic energy storage system. The monitoring module is configured to monitor the charging and discharging power value of the energy storage system and the power value of the grid connection point in real time, respectively, when the photovoltaic energy storage system is currently in the charging and discharging state. The control module is configured to adjust the real-time monitored charging and discharging power values of the energy storage system and the power value of the grid connection point until the energy storage system reaches the maximum charging and discharging power value.
9. A computing device, comprising: Memory and processor; The memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions, which, when executed by the processor, implement the steps of the power control method of the optical storage system according to any one of claims 1 to 7.
10. A computer-readable storage medium storing computer-executable instructions that, when executed by a processor, implement the steps of the power control method for the optical storage system according to any one of claims 1 to 7.