A control system based on power tracking of an energy storage system

Abstract

The present invention discloses a control system based on power tracking of an energy storage system, which relates to the field of energy storage power tracking control systems. The control system includes a power intelligent change control device. The input end of the power intelligent change control device is connected to the output end of a total input watt-hour meter, and the output end of the power intelligent change control device is respectively connected to a temperature and humidity sensor and an inverter. The present invention has the advantages of high monitoring real-time performance, timely information feedback speed, wide application scenarios, strong operability, etc. It can effectively ensure that under the premise of the energy storage power station providing effective energy supply, an optimal operation plan is provided for the power grid power of the power station, automatically and efficiently balance the impact on the power grid when the load suddenly changes, and reduce the power requirement of the energy storage power station for the power grid. It realizes intelligent statistical operation to achieve reasonable adjustment of the overall power, and has strong practical value in the field of energy storage technology.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage power tracking control systems, and particularly to a control system based on energy storage system power tracking. Background Art

[0002] In the prior art, people try to reserve as much power margin as possible when controlling power.

[0003] However, when people control power, it is impossible to avoid the situation where the rated power is passively increased when a sudden high power occurs, resulting in unnecessary losses for no reason.

[0004] Moreover, a large amount of reserved idle power cannot be effectively utilized, resulting in a waste of a large amount of resources, and the grid power cannot be utilized efficiently. There is also a drawback that the generated electric energy of the grid is redundant and cannot be consumed. Therefore, we provide a control system based on energy storage system power tracking to solve the above problems.

[0005] In view of the problems existing in the above prior art, the present invention provides a control system based on energy storage system power tracking to solve the problems that when people control power, it is impossible to avoid the situation where the rated power is passively increased when a sudden high power occurs, resulting in unnecessary losses for no reason; a large amount of reserved idle power cannot be effectively utilized, resulting in a waste of a large amount of resources, and the grid power cannot be utilized efficiently. There is also a drawback that the generated electric energy of the grid is redundant and cannot be consumed.

[0006] To achieve the above object, a control system based on energy storage system power tracking adopted by the present invention includes a power intelligent change control device. The input end of the power intelligent change control device is connected to the output end of the total input watt-hour meter. The output end of the power intelligent change control device is respectively connected to a temperature and humidity sensor and an inverter. The inverter is bidirectionally connected to the battery module. The output end of the inverter is connected to the internal high-voltage bus. The total input watt-hour meter is respectively connected between the external high-voltage bus and the internal high-voltage bus. A load device is connected to the internal high-voltage bus;

[0007] The power intelligent change control device includes an energy storage power tracking control system. When calculating the charging power of the energy storage power tracking control system, it obtains the total grid input power information at the start of the operation cycle, determines whether the total grid input power is in reverse flow. If the acquisition fails, it enters the abnormal state. Otherwise, it enters the next judgment process, obtains the power output by various power generation devices. If the acquisition fails, it enters the abnormal state. Otherwise, it comprehensively judges whether it is necessary to reduce the inverter output power, directly turn off the inverter output power, or make the inverter start charging to consume the redundant electric energy by combining the obtained total grid input power and the power output by various power generation devices.

[0008] As a further optimization of the above solution, when comparing the reverse power with the inverter power, if the reverse power is small, the inverter output power is reduced. If the inverter power becomes small, the inverter output power is turned off. When the inverter output power is turned off, charging starts to consume the remaining inverter current power.

[0009] As a further optimization of the above solution, when only one energy storage device is required for the energy storage power tracking control system, the energy storage power tracking control system operates in the intelligent control device, and intelligent algorithms are used to achieve real-time monitoring of the status of the energy storage device, the operating status of the local operating system, adjustment of operating parameters, or emergency state handling.

[0010] As a further optimization of the above solution, when multiple energy storage devices are required, the energy storage power tracking control system operates on the server.

[0011] As a further optimization of the above solution, the load devices include but are not limited to electric energy meters, temperature and humidity sensors, inverters, and battery modules.

[0012] As a further optimization of the above solution, the parameters originally required to be configured for the energy storage power tracking control system are: operating cycle time, original power, initial ratio, transformer rated power, upper and lower protection temperatures of the battery working environment, upper and lower limit temperatures of the battery working environment, upper and lower protection humidities of the battery working environment, upper and lower limit humidities of the battery working environment, battery charging normal interval parameters, battery charging adjustment interval parameters, and battery charging protection interval parameters.

[0013] As a further optimization of the above solution, the charging power calculation process of the energy storage power tracking control system is to obtain the total grid input power information at the start of the operating cycle. If the information cannot be obtained normally, it enters the abnormal state. Otherwise, it enters the next judgment process. After obtaining the total grid input power, it judges whether to enter the protection interval. If it enters the protection interval, the inverter is controlled to reduce the charging power.

[0014] As a further optimization of the above solution, the power of the usage mode at the initial stage of the operation of the energy storage power tracking control system is calculated according to the following formula as the target power for operation. The calculation formula for the target power at the initial operation of the system is as follows:

[0015] P initial value = β * P mode value

[0016] Among them, P initial value is the initial power of the operation of the energy storage power tracking control system, and P mode value is the power after the input parameters of the energy storage power tracking control system.

[0017] The role of β is to determine the source of P initial value and the update method during the operation of the system;

[0018] When β = 1, the system default assignment is used

[0019] Revised using intelligent algorithm when β = 2.

[0020] During the operation of the energy storage power tracking control system, the current grid power is continuously updated from the total input watt-hour meter as a reference for adjusting the target power. After the energy storage power tracking control system determines that the grid power meets the conditions, the target power is updated as a new target. In this operation process, adjustments are made repeatedly. When the time crosses months, initialization is performed, and then it is executed repeatedly. The results calculated by the repeated execution form a statistical table inside the energy storage power tracking control system for subsequent judgment as a reference, and global analysis is carried out according to the time line. The states at this moment in the past are obtained at annual, monthly, weekly, and daily periodic time points for comparison and prediction.

[0021] As a further optimization of the above solution, after obtaining the target power, it is used as a reference for the charge and discharge of the energy storage power tracking control system. When entering the charging mode, the load power situation on the grid access side is detected at all times. When the load power is lower than the target power, the charging power is increased to achieve the charging process without increasing the original power. When the load power is higher than the target power, the charging power is decreased to prevent the rated power from increasing due to charging. When the load power is higher than the total grid input power, charging is turned off, and charging is resumed when the load power drops.

[0022] As a further optimization of the above solution, comparing the target power with the total grid input power will result in three situations: First, the target power is greater than the total grid input power. At this time, the charging power of the inverter is increased to increase the charging speed. Second, the target power is equal to the total grid input power, and no adjustment is required. Third, when the total grid input power is greater than the target power, the charging power of the inverter needs to be obtained for adjustment. Since inverter charging will cause the total grid input power to increase, when the total grid input power exceeds the target power, the total grid input power will be reduced by operating to reduce the charging power, so as to make the total grid input power approach the target power or remain equal within the adjustment range to the greatest extent.

[0023] A control system based on energy storage system power tracking of the present invention has the following beneficial effects:

[0024] A control system based on energy storage system power tracking of the present invention has the advantages of high real-time monitoring, timely information feedback speed, wide application scenarios, strong operability, etc. It can effectively ensure that the energy storage power station provides effective energy supply and at the same time provides the optimal operation plan for the grid power of the power station, automatically and efficiently balance the impact on the grid when the load suddenly changes, and reduce the requirements of the energy storage power station for grid power, realize intelligent statistical operation to achieve reasonable adjustment of the overall power, and has strong practical value in the field of energy storage technology;

[0025] The present invention has a fast power control response speed, a short real-time monitoring period, realizes safe closed-loop control, optimizes the power rating through an intelligent algorithm, reduces the application rating, offsets sudden loads during operation, and stabilizes the load power;

[0026] For the access of the energy storage system, the present invention optimizes the charging logic, increases the charging power when the load is light and reduces the charging power when the load is heavy, thereby reducing the power capacity increase due to energy storage charging.

[0027] Referring to the following description and the accompanying drawings, specific embodiments of the present invention are disclosed in detail, indicating the ways in which the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited thereby in scope. Within the spirit and terms of the appended claims, the embodiments of the present invention include many changes, modifications, and equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a control system framework diagram based on power tracking of the energy storage system of the present invention.

[0029] Figure 2 It is a system power adjustment flowchart of the present invention.

[0030] Figure 3 It is an effect diagram of the charging control result of the present invention.

[0031] Figure 4 It is an effect diagram of the discharge control result of the present invention.

[0032] Figure 5 It is an anti-counterflow control flowchart of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the scope of the present invention.

[0034] It should be noted that when an element is referred to as being "disposed on, provided with" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected, connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. "Fixed connection" means a fixed connection, and there are many ways of fixed connection, which are not within the scope of protection of this article. The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are only for the purpose of illustration and do not represent the only embodiments.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this invention belongs. The terms used in the specification herein are for the purpose of describing specific embodiments only and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the related listed items;

[0036] Please refer to the attached drawings of the specification Figures 1-5 The present invention provides a technical solution: a control system based on energy storage system power tracking, including a power intelligent change control device. The input end of the power intelligent change control device is connected to the output end of the total input electric energy meter. The output end of the power intelligent change control device is respectively connected to a temperature and humidity sensor and an inverter. The inverter is bidirectionally connected to the battery module. The output end of the inverter is connected to the internal strong power bus. The total input electric energy meter is connected between the external strong power bus and the internal strong power bus. A load device is connected to the internal strong power bus.

[0037] When only one energy storage device is required for the energy storage power tracking control system, the energy storage power tracking control system operates in the intelligent control device. The intelligent control device is a hardware device and has a high-performance (528 MHz) large storage (128M NandFlash) intelligent processing module. The intelligent processing can use an ARM chip and is connected to various hardware devices through the high-speed communication interface of the intelligent processing module, and can obtain the real-time parameters of related auxiliary devices such as the surrounding electric energy meter, temperature and humidity sensor, inverter, and battery module in a very short time. The intelligent control device is installed inside the energy storage device to operate and realize the control of the energy storage power tracking control system.

[0038] When multiple energy storage devices are required, the energy storage power tracking control system will operate on the server. The server monitors the operating states of all energy storage devices. The energy storage power tracking control system will operate above all energy storage devices, and the overall control of all energy storage devices can be realized.

[0039] The original parameters that need to be configured for the energy storage power tracking control system are: operating cycle time, original power, initial ratio, transformer rated power, upper and lower protection temperatures of the battery working environment, upper and lower limit temperatures of the battery working environment, upper and lower protection humidities of the battery working environment, upper and lower limit humidities of the battery working environment, normal battery charging interval parameters, battery charging adjustment interval parameters, and battery charging protection interval parameters. The above parameters need to be configured according to the actual situation and will not be elaborated here.

[0040] In the initial stage of operation of the energy storage power tracking control system, the original power is used as the target power to operate according to a certain ratio (initial ratio). The calculation formula for the target power of the initial operation of the system is as follows:

[0041] Initial value of P = β * Pattern value of P

[0042] Among them, the initial value of P is the initial power for the operation of the energy storage power tracking control system, and the pattern value of P is the power after the input parameters of the energy storage power tracking control system.

[0043] The role of β is to determine the source of the initial value of P and the update method during the system operation.

[0044] When β = 1, the system default assignment is used.

[0045] When β = 2, intelligent algorithms are used for revision.

[0046] During the operation of the energy storage power tracking control system, the current grid power is continuously updated from the total input watt-hour meter, serving as a reference for adjusting the target power. After the energy storage power tracking control system determines that the grid power meets the conditions, the target power is updated as a new target. In this operation process, it repeats continuously and adjusts constantly. Only when the time crosses a month will initialization be performed, and then it will be executed repeatedly. The results calculated from the repeated execution form a statistical table within the energy storage power tracking control system for subsequent judgment as a reference, and global analysis is carried out according to the time line. At periodic time points such as year, month, week, day, and hour, the states at this moment in the past are obtained for comparison and prediction. After obtaining the target power, it serves as a reference for the charging and discharging of the energy storage power tracking control system. When entering the charging mode, the load power situation on the grid access side is detected at all times. When the load is low, the charging power is appropriately increased to achieve the charging process as quickly as possible without increasing the original power. When the load is high, the charging power is appropriately reduced to prevent the rated power from increasing due to charging. When the load is even higher, consider turning off the charging and then turning on the charging process when the load power drops. The energy storage power tracking control system reserves the function of discharging compensation power. When the function is enabled, battery discharging can be considered to compensate for the possible increase in grid power caused by a sudden excessive load. Since this function conflicts with the peak-valley electricity strategy, the function needs to be adjusted in real time according to the on-site situation.

[0047] Specific embodiment: When only one energy storage device is required for the energy storage power tracking control system, the energy storage power tracking control system will operate in the intelligent control device and use intelligent algorithms (Web management page can be used) to achieve real-time monitoring of the energy storage device status, local operating system status, adjustment of operating parameters, or emergency status handling;

[0048] As Figure 1 shown in: When multiple energy storage devices are required, the energy storage power tracking control system will operate on a dedicated server.

[0049] The total input watt-hour meter is used to provide the relevant parameters of the total input electrical energy of the power station for the energy storage power tracking control system.

[0050] The temperature and humidity sensor is used to provide a reference basis for the battery temperature operation strategy of the energy storage power tracking control system.

[0051] The inverter is used to perform bidirectional conversion of charging and discharging of the energy stored in the battery.

[0052] The battery module is used for storing electric energy, and the battery module includes multiple batteries.

[0053] The energy storage power tracking control system installs on-site a power intelligent change control device or installs an EMS service program to make it operate normally after startup, and sets the original configuration parameters into the energy storage power tracking control system.

[0054] The energy storage power tracking control system needs to cooperate with the use of the grid total input side meter load power information, the inverter device charge and discharge information, and the inverter control authority. Use communication means (including TCP, RS485, Can, etc.) to read the overall load power information of the meter and the inverter device information into the energy storage power tracking control system. When connecting the communication line, if it is TCP, use a network cable above Cat5e shielded; if it is RS485 or Can communication, use a double-shielded twisted pair wire above 1.5mm², and it can be normally installed by the energy storage power tracking control system.

[0055] The safety strategy of the energy storage power tracking control system. Since the energy storage power tracking control system is usually applied to the energy storage equipment in use, the charging load situation of the energy storage equipment is not considered in the preliminary design of the power load. Due to the existence of the maximum rated load in the total input box transformer, the input maximum power is used as a parameter to participate in the system operation strategy and as an insurance mechanism to participate in the system safety protection to prevent abnormal overload of the transformer. The following operation strategies are independent and synchronous in the system respectively.

[0056] The temperature and humidity safety strategy. Continuously check the actual sampling value of the temperature and humidity sensor. If the acquisition of real-time data fails, it enters the abnormal state. Otherwise, compare the obtained current temperature and humidity values with the upper and lower protection temperature settings and the upper and lower protection humidity settings of the battery working environment respectively. Whether it exceeds the lower limit or the upper limit, perform the operation of reducing the battery charging power or shutting down to protect the safe operation of the battery.

[0057] Charging power calculation process of the energy storage power tracking control system. At the beginning of the operation cycle, the total grid input power information is obtained. If the information cannot be obtained normally, it enters the abnormal state; otherwise, it enters the next judgment process. After obtaining the total grid input power, it is judged whether to enter the protection interval. If it enters the protection interval, the inverter is controlled to reduce the charging power; otherwise, it enters the next judgment process. Comparing the target power with the total grid input power will result in three situations. First, when the target power is greater than the total grid input power, the charging power of the inverter can be appropriately increased to achieve the purpose of increasing the charging speed. Second, when the target power is equal to the total grid input power, no adjustment is required and the status quo can be maintained. Third, when the total grid input power is greater than the target power, the charging power of the inverter needs to be obtained for adjustment. Since the charging of the inverter will cause the total grid input power to increase, when the total grid input power exceeds the target power, the total grid input power will be reduced by reducing the charging power, so as to make the total grid input power approach the target power or remain equal within the adjustable range to the greatest extent.

[0058] The adjusted power calculation formula is as follows:

[0059] P adjustment = P target - P grid

[0060] P inverter = P original inverter + P adjustment;

[0061] Among them, P target is the target power, P grid is the total grid input power, P adjustment is the power value that needs to be adjusted, P original inverter is the original power of the inverter, and P inverter is the charging power of the inverter.

[0062] Operation strategy of the energy storage power tracking control system during the first run or at the beginning of each month. If it is the first few days of the current month and the target power is unknown, the initial ratio (set parameter) of the original power (set parameter) is first used as the current target power. The total grid input power is obtained within each operation cycle (set parameter). If the acquisition fails, it will transfer to the abnormal state; otherwise, the total grid input power is compared with the original target power. Within a reasonable range, if the target power is greater, the total grid input power is used as the new target power; otherwise, the original power is maintained and waiting for the next judgment cycle.

[0063] The charging protection area strategy of the energy storage power tracking control system divides the total power into three intervals: the normal interval, the adjustment interval, and the protection interval (set parameters). The interval sorting starts from 0 upwards as the normal interval. When reaching the boundary between the normal interval and the adjustment interval, going further upwards is the adjustment interval. When reaching the boundary between the adjustment interval and the protection interval, going further upwards is the protection interval, and the highest point is the upper boundary of the protection area. The normal interval is the normal active area that can be used for adjustment. When reaching the adjustment interval range, adjustments need to be made as soon as possible to prevent power range exceedance caused by sudden power consumption situations. When reaching the protection area, protection needs to be immediately executed, charging is switched off and the system enters a static state, or even discharging is carried out to offset the instantaneous sudden load.

[0064] The anti-backflow strategy of the energy storage power tracking control system. During the operation of the energy storage power tracking control system, since the inverter will send electrical energy to the internal power grid, but due to various reasons, there may be no power consumption in the internal power grid, which will cause this part of the electrical energy to be output to the grid. To prevent such situations from occurring, real-time monitoring is required. The operation cycle monitors and obtains the total grid input power information, and judges whether the total grid input power is in backflow. If the acquisition fails, it enters an abnormal state; otherwise, it enters the next judgment process. Obtain the power output by various power generation devices. If the acquisition fails, it enters an abnormal state; otherwise, comprehensively judge whether it is necessary to reduce the inverter output power or directly turn off the inverter output power, or even make the inverter start charging to consume this part of the excess electrical energy, so as to achieve the purpose of preventing electrical energy from being backflow output to the grid.

[0065] In actual use, when comparing the backflow power and the inverter power, if the backflow power is small, the inverter output power is reduced. If the inverter power becomes small, the inverter output power is turned off. When turning off the inverter output power, charging can also be started to consume the remaining inverter current power.

[0066] Among them, after the energy storage power tracking control system has been running for a long time, a certain amount of historical data will be accumulated. These data are continuously accumulated during the operation and serve as the guiding basis for the later operation. The historical data in the early stage will be statistically distinguished in various time periods such as years, months, weeks, days, and hours. From the annual span, the electricity consumption situation of each month can be predicted, and adjustments can be made in advance. Combining with the month information, the prediction can be accurate to each day in terms of weeks and days, providing a target reference for the calculation of the energy storage power tracking control system.

[0067] At the beginning of operation, the energy storage power tracking control system inputs a large amount of meteorological data to form a data basis, and obtains the current meteorological data in real time through the interface. According to the historical average temperature and the current temperature in the meteorological data, the power consumption of the project can be predicted in advance, and corresponding adjustments can be made during the operation.

[0068] These are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall fall within the protection scope of the present invention.

Claims

1. A control system based on power tracking of an energy storage system, including a power intelligent change control device, characterized in that: The input end of the power intelligent change control device is connected to the output end of the total input watt-hour meter. The output end of the power intelligent change control device is connected to an inverter, and there is a two-way connection between the inverter and the battery module. The output end of the inverter is connected between the internal high-voltage bus. The total input watt-hour meter is respectively connected between the external high-voltage bus and the internal high-voltage bus, and a load device is connected to the internal high-voltage bus; The power intelligent change control device includes an energy storage power tracking control system. When calculating the charging power of the energy storage power tracking control system, it obtains the total grid input power information at the start of the operation cycle, determines whether the total grid input power is in reverse flow. If the acquisition fails, it enters the abnormal state. Otherwise, it enters the next judgment process, obtains the power output by various power generation devices. If it fails, it enters the abnormal state. Otherwise, it comprehensively judges whether it is necessary to reduce the inverter output power, directly turn off the inverter output power, or make the inverter start charging and consume the excess electric energy by combining the obtained total grid input power and the power output by various power generation devices; The charging power calculation process of the energy storage power tracking control system is to obtain the total grid input power information at the start of the operation cycle. If the information is not obtained normally, it enters the abnormal state. Otherwise, it enters the next judgment process. After obtaining the total grid input power, it judges whether it enters the protection interval. If it enters the protection interval, it controls the inverter to reduce the charging power; In the initial stage of operation of the energy storage power tracking control system, it operates with the original power as the target power according to the initial ratio. The calculation formula for the target power at the initial operation of the system is as follows: P initial value = β * P mode value; Among them, P initial value is the initial power of the operation of the energy storage power tracking control system, and P mode value is the power after the input parameters of the energy storage power tracking control system; The role of β is to determine the source of P initial value and the update method during the operation of the system; When β = 1, the system default assignment is used When β = 2, the intelligent algorithm is used for revision; After obtaining the target power, it is used as a reference for the charge and discharge of the energy storage power tracking control system. When entering the charging mode, it continuously detects the load power situation on the grid access side. When the load power is lower than the target power, it increases the charging power to achieve the charging process without increasing the original power. When the load power is higher than the target power, it reduces the charging power to prevent the rated power from increasing due to charging. When the load power is higher than the total grid input power, it turns off the charging and waits until the load power drops before starting the charging process again.

2. The control system based on power tracking of an energy storage system according to claim 1, characterized in that: After the long-term operation of the energy storage power tracking control system, historical data will be accumulated. These data will be continuously accumulated during the operation. The historical data in the early stage will be statistically distinguished by each time period of year, month, week, day, and hour. The electricity consumption situation of each month will be predicted from the annual span and adjustments will be made in advance. Combining with the month information, the prediction will be accurate to each day in the time of week and day, which will provide a target reference for the calculation of the energy storage power tracking control system.

3. A control system based on power tracking of an energy storage system according to claim 1, characterized in that: The energy storage power tracking control system inputs a large amount of meteorological data at the beginning of operation to form a data basis, and obtains the current meteorological data in real time through an interface. It predicts the power consumption of the project in advance based on the historical average temperature and the current temperature in the meteorological data, and makes corresponding adjustments during operation.

4. A control system based on power tracking of an energy storage system according to claim 1, characterized in that: When only one energy storage device is required for the energy storage power tracking control system, the energy storage power tracking control system operates in the intelligent control device and uses intelligent algorithms to achieve real-time monitoring of the energy storage device status, the local operating system status, adjustment of operating parameters, or emergency status handling.

5. A control system based on power tracking of an energy storage system according to claim 1, characterized in that: The load devices include, but are not limited to, electric energy meters, inverters, and battery modules.

6. A control system based on energy storage system power tracking according to claim 1, characterized in that: During the operation of the energy storage power tracking control system, the current grid power is continuously updated from the total input electric energy meter as a reference for adjusting the target power. After the energy storage power tracking control system determines that the grid power meets the conditions, the target power is updated as a new target. Adjustments are made in a cycle during this operation process. When the time crosses a month, initialization is performed, and then it is repeated. The results calculated by the repeated execution form a statistical table within the energy storage power tracking control system for subsequent judgment as a reference, and global analysis is performed according to the time line. The states at the same time in the past are obtained at annual, monthly, weekly, and daily periodic time points for comparison and prediction.

7. A control system based on power tracking of an energy storage system according to claim 6, characterized in that: Comparing the target power with the total grid input power will result in three situations: First, the target power is greater than the total grid input power. At this time, the charging power of the inverter is increased to increase the charging speed. Second, the target power is equal to the total grid input power, and no adjustment is required. Third, when the total grid input power is greater than the target power, the charging power of the inverter needs to be obtained for adjustment. Since the charging of the inverter will cause the total grid input power to increase, when the total grid input power exceeds the target power, the charging power will be reduced to lower the total grid input power, so that the total grid input power is close to or equal to the target power within the adjustment range. The power adjustment calculation formula is as follows: P adjustment = P target - P grid P inverter = P original inverter + P adjustment; Where, P target is the target power, P grid is the total grid input power, P adjustment is the power value that needs to be adjusted, P original inverter is the original power of the inverter, and P inverter is the charging power of the inverter.

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