A method and computing device for off-grid microgrid control of multi-network equipment

Abstract

The present invention provides a method and computing device for controlling an off-grid microgrid with multiple networking devices, which are applied in the field of new energy technology. The method includes: initializing and starting the microgrid system; determining the networking device, including: controlling and traversing the energy storage system and the diesel generator each time the network is established, preferentially using the energy storage device as the networking device, ensuring that only one energy storage device is used for each network establishment, and starting the diesel generator as the networking device when no energy storage device is available in the microgrid system for networking; and managing the energy storage system and performing active power increase or decrease operations. The method of the present invention can ensure the stable operation of the microgrid.

Description

Technical Field

[0001] The present invention relates to the field of new energy technologies, and in particular to a method and computing device for controlling an off-grid microgrid with multi-network equipment. Background Art

[0002] In areas with limited access to the main grid or unstable power supply, off-grid microgrid systems are an important means of addressing power supply issues in remote areas. Off-grid microgrid systems are capable of independent operation, integrating various local power generation resources, such as solar and wind power, and energy storage systems to provide power. They can achieve regional power self-sufficiency without the support of the main grid. Through diversified energy supply and energy storage, off-grid microgrids can provide a stable power supply, reduce the risk of power outages, and improve the quality of power service.

[0003] However, due to the lack of connection to the main power grid, how to effectively manage and dispatch the various power sources within the off-grid microgrid system to ensure the stable and efficient operation of the system has become a challenge.

[0004] Therefore, a method for controlling off-grid microgrids with multiple network devices is needed. Faced with a wide variety of grid services, how to reasonably and effectively plan for different services is of great significance. Summary of the Invention

[0005] The present invention aims to provide a method and computing device for controlling an off-grid microgrid with multiple network devices, so as to effectively manage and dispatch each device in an off-grid microgrid system and ensure the stable and efficient operation of the system.

[0006] According to one aspect of the present invention, a method for controlling an off-grid microgrid with multi-grid devices is provided. The microgrid system includes at least a new energy power generation system, an energy storage system, and a diesel generator. The energy storage system includes at least one energy storage device. The method includes:

[0007] Initializing and starting the microgrid system, including: confirming that all parts of the microgrid system are in a controllable state and operate normally in an off-grid mode;

[0008] Determining a networking device includes: controlling and traversing the energy storage system and the diesel generator each time the network is established, preferentially using the energy storage device as the networking device, and ensuring that only one energy storage device is used for each networking; when there is no available energy storage device in the microgrid system for networking, starting the diesel generator as the networking device;

[0009] The energy storage system is managed, including: when the networking device is the energy storage device, performing charge state detection and active power absolute value judgment, and judging whether charging or discharging operations are required according to the charge state; when the networking device is the diesel generator, obtaining active power regulation amounts of power generation equipment other than the diesel generator, and performing active power increase or decrease operations by comparing the absolute values ​​of the active power regulation amounts of the power generation equipment other than the diesel generator with a preset threshold.

[0010] According to some embodiments, determining whether a charging or discharging operation is required according to the charge state includes:

[0011] detecting the charge state of the energy storage device, and if the charge state of the energy storage device is lower than the lower limit of the grid charge state, charging the energy storage device by adjusting the active power of the new energy power generation system;

[0012] If the state of charge of the energy storage device is higher than the lower limit of the grid charge state, determine whether the state of charge of the energy storage device is higher than the upper limit of the grid charge state; if the state of charge of the energy storage device is higher than the upper limit of the grid charge state, discharge the energy storage device by adjusting the active power of the new energy power generation system;

[0013] If the charge state of the energy storage device is higher than the lower limit of the network charge state, and the charge state of the energy storage device is lower than the upper limit of the network charge state, an active absolute value judgment is performed.

[0014] According to some embodiments, charging the energy storage device by adjusting the active power of the photovoltaic power generation system includes:

[0015] The power output of the photovoltaic power generation system is monitored in real time, and the maximum power point of the photovoltaic power generation system is located using a maximum power point tracking algorithm.

[0016] According to some embodiments, when the charge state of the energy storage device is higher than the lower limit of the network charge state and lower than the upper limit of the network charge state, an active absolute value judgment is performed;

[0017] If the absolute value of the active power of the energy storage device is less than the set power threshold, the system active power does not need to be adjusted. If the absolute value of the active power of the energy storage device is greater than the set power threshold, it is judged that the direction of the system active power to be allocated is to increase active power, and the active power is increased by discharging the inverter or non-grid energy storage system. If it is judged that the direction of the system active power to be allocated is to reduce active power, the active power of the diesel generator is reduced for charging and storage.

[0018] According to some embodiments, performing an active power increase operation by comparing the absolute values ​​of active power regulation quantities of power generation equipment other than the diesel generator includes:

[0019] Increase output power through renewable energy power generation systems until full power is achieved;

[0020] If adjustment is still required after controlling the new energy power generation system, the output power of energy storage can be increased to meet the increase in active power.

[0021] According to some embodiments, performing an active power reduction operation by comparing the absolute values ​​of active power regulation amounts of power generation equipment other than the diesel generator includes:

[0022] The energy storage system is adjusted first. If further adjustment is still required after the energy storage system is adjusted, the active power is reduced through the new energy power generation system.

[0023] According to some embodiments, the method further comprises load management, wherein:

[0024] The buffering effect of the networking equipment is applied to cope with load changes, and load distribution is dynamically adjusted according to load priority and power supply conditions.

[0025] According to some embodiments, the new energy power generation system includes one or more of a photovoltaic power generation system, a wind power generation system, and a geothermal power generation system.

[0026] According to another aspect of the present invention, a computer program product is provided, comprising a computer program, wherein the computer program implements any of the aforementioned methods when executed by a processor.

[0027] According to another aspect of the present invention, there is provided a computing device comprising:

[0028] processor; and

[0029] A memory stores a computer program, which, when executed by the processor, causes the processor to perform any of the aforementioned methods.

[0030] According to an exemplary embodiment of the present invention, it is confirmed that each part of the microgrid system is in a controllable state and operates normally in off-grid mode, ensuring the safe operation of the system after startup and being unaffected by fluctuations in the external power grid, thereby improving the reliability of the system. Prioritizing the use of energy storage devices can improve energy utilization efficiency, ensuring that only one energy storage device is used in each network construction, which saves energy and facilitates management without worrying about coordination issues between multiple devices. By managing the energy storage system, the energy balance of the energy storage system is ensured, and the stable operation of the microgrid is ensured by utilizing the increase or decrease of active power.

[0031] By adjusting the energy storage system, this invention enables flexible power dispatch, quickly responding to grid changes, and improving the stability of the microgrid. By dynamically adjusting load distribution, it ensures that each load receives sufficient power, improving both power quality and energy utilization.

[0032] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments.

[0034] Figure 1 A flow chart illustrating a method for off-grid microgrid control of multiple grid-connected devices according to an example embodiment.

[0035] Figure 2 A flow chart for identifying networking devices according to an example embodiment is shown.

[0036] Figure 3 A flow chart illustrating a charging or discharging operation when the energy storage device is a networking device according to an example embodiment.

[0037] Figure 4 A schematic diagram illustrating an operation of increasing or decreasing active power when the energy storage device is a grid-connected device according to an example embodiment.

[0038] Figure 5 A schematic diagram illustrating an operation of increasing or decreasing active power when a diesel generator is a grid-connected device according to an example embodiment.

[0039] Figure 6 A block diagram of a computing device according to an example embodiment of the present invention is shown. DETAILED DESCRIPTION

[0040] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. Like reference numerals in the drawings represent like or similar parts, and thus repeated description thereof will be omitted.

[0041] In addition, the described features, structures or characteristics may be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present invention. However, it will be appreciated by those skilled in the art that the technical solutions of the present invention can be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. may be adopted. In other cases, known methods, devices, implementations or operations are not shown or described in detail to avoid blurring various aspects of the present invention.

[0042] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically separate entities. That is, these functional entities may be implemented in software, in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0043] The flowcharts shown in the accompanying drawings are for illustrative purposes only and do not necessarily include all contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps may be decomposed, while others may be combined or partially combined. Therefore, the actual execution order may vary depending on the actual situation.

[0044] It should be understood that although the terms first, second, third, etc. may be used herein to describe various components, these components should not be limited by these terms. These terms are used to distinguish one component from another. Thus, the first component discussed below could be referred to as the second component without departing from the teachings of the present inventive concept. As used herein, the term "and / or" includes any one and all combinations of one or more of the associated listed items.

[0045] The user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in the present invention are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with the relevant laws, regulations and standards of relevant countries and regions, and provide corresponding operation entrances for users to choose to authorize or refuse.

[0046] Those skilled in the art will understand that the drawings are merely schematic diagrams of example embodiments, and the modules or processes in the drawings are not necessarily necessary for implementing the present invention, and therefore cannot be used to limit the scope of protection of the present invention.

[0047] Off-grid microgrid systems are capable of independent operation. By integrating various local power generation resources, such as photovoltaic power, wind power, and diesel generators, they can achieve regional power self-sufficiency without the support of a larger power grid. However, the lack of effective coordinated management between local power generation resources has led to numerous operational problems. For example, when photovoltaic power generation is insufficient, untimely scheduling of energy storage systems and diesel generators can lead to power shortages. Conversely, when photovoltaic power generation is excessive, the energy storage system fails to fully utilize the excess power, resulting in system overload and energy waste. Furthermore, real-time monitoring of the status of each device and fault warnings during system operation increase the difficulty of operation and maintenance.

[0048] The present invention proposes a method for controlling an off-grid microgrid with multi-network equipment to solve the above problems.

[0049] Before describing the embodiments of the present application, some terms or concepts involved in the embodiments of the present application are explained.

[0050] SOC (State of Charge) refers to the ratio of the energy currently contained in the battery to the maximum energy it can hold when fully charged. That is, the ratio of the remaining power in the battery to its capacity in a fully charged state.

[0051] Exemplary embodiments of the present invention are described below with reference to the accompanying drawings.

[0052] According to some embodiments, the grid-forming device is suitable for power grids containing a large number of new energy power generation systems. Because the power grids of renewable energy in the new energy power generation systems have higher uncertainty, such as the intermittent nature of solar energy and wind energy, the grid-forming device can help these power grids better manage power quality and frequency stability.

[0053] The present invention provides a method for controlling an off-grid microgrid with multi-network equipment, which achieves optimal configuration of power resources and efficient and stable operation of the system by effectively coordinating the new energy power generation system, energy storage system, diesel generator and load management system.

[0054] According to an exemplary embodiment, the renewable energy power generation system includes one or more of a photovoltaic power generation system, a wind power generation system, and a geothermal power generation system. The present invention hereinafter uses a photovoltaic power generation system as an example of a power generation device in a microgrid. Photovoltaic power generation systems utilize solar energy to generate electricity, offering the advantages of clean, renewable, and pollution-free operation. However, due to the instability of their power generation, energy storage systems and diesel generators are required as networking equipment to support the stable operation of the entire system.

[0055] A grid-connected energy storage system can mimic the behavior of synchronous generators, providing the necessary inertia and short-circuit capacity to help renewable energy grids cope with frequency fluctuations and transient faults. The energy storage system in this embodiment uses batteries and other energy storage devices to store excess energy, releasing it when power generation is insufficient, balancing power supply and demand and ensuring the continuity and stability of power supply. The energy storage system is flexible, controllable, and has strong buffering capacity. Diesel generators serve as a backup power source, providing emergency power support when both the photovoltaic power generation system and the energy storage system are unable to meet demand, thus ensuring the reliability of the power system.

[0056] In the off-grid microgrid control system of the multi-grid device, the inverter communication module is used to communicate with the inverter of the photovoltaic power generation system and send the collected photovoltaic power generation system data to the microgrid management and control platform. At the same time, the microgrid management and control platform intelligently dispatches the energy storage system and diesel generator to ensure the frequency and voltage stability of the power grid.

[0057] In this proposed off-grid microgrid with multiple networking devices, the photovoltaic system provides the primary power supply, with the networking devices acting as auxiliary. Intelligent scheduling ensures the proper distribution of the power load. The entire microgrid system adjusts the active power output of each generating device based on real-time load conditions, ensuring that the active power of the networking devices remains stable at the set value, maintaining system balance and stability.

[0058] Figure 1 A flow chart illustrating a method for off-grid microgrid control of multiple grid-connected devices according to an example embodiment.

[0059] See also Figure 1 ,In S101, the microgrid system is initialized and started.

[0060] According to an example embodiment, during the system initialization and startup phase, it is necessary to confirm that all parts of the microgrid system are in a controllable state and operate normally in off-grid mode, initialize various parameters of the microgrid system, including set values ​​such as voltage, frequency, and power, and prepare to start the microgrid system.

[0061] The microgrid system is started, and the system is fully monitored and managed through the controller. At the same time, the operating status of each device in the microgrid, such as the photovoltaic power generation system, energy storage system, diesel generator, etc., is detected to ensure the normal operation of the equipment.

[0062] In S103, the networking device is determined.

[0063] According to some embodiments, the networking equipment is responsible for supporting the frequency and voltage of the power grid in the entire off-grid area to ensure the stable operation of the power grid. The microgrid system adjusts the output parameters of the equipment by monitoring the voltage and frequency in the power grid in real time to maintain stability. At the same time, the networking equipment adjusts the active power output according to changes in the load, acting as a buffer. When the load increases, the networking equipment quickly increases the output power; when the load decreases, the output power is reduced to maintain the balance of the power grid. According to some embodiments, the output power of the networking equipment should be maintained at approximately half of its rated power. This allows for a rapid response to sudden increases or decreases in the load, avoiding large fluctuations in the power grid.

[0064] According to an example embodiment, each time a network is established, the energy storage system and the diesel generator are controlled and traversed to obtain the status of the energy storage system and the diesel generator, and to check whether there is a network-establishing device. If there is no network-establishing device, an alarm is triggered; if there is a network-establishing device, the energy storage device is used as the network-establishing device first, and it is ensured that there is only one energy storage device for each network establishment. When there is no available energy storage device in the microgrid system for network establishment, the diesel generator is started as the network-establishing device (see the flowchart for confirming the network-establishing device). Figure 2 ).

[0065] In S105 , the energy storage system is managed.

[0066] According to an example embodiment, when the networking device is the energy storage device, charge state detection and active power absolute value judgment are performed, and whether charging or discharging operation is required is judged based on the charge state; when the networking device is the diesel generator, the active power regulation amount of the power generation equipment other than the diesel generator is obtained, and by comparing the absolute value of the active power regulation amount of the power generation equipment other than the diesel generator with the size of the preset threshold, the active power is increased or decreased.

[0067] In grid-forming mode, the energy storage system must be prioritized for control and traversal, ensuring that only one energy storage device is connected to the grid at any one time. The energy storage system's state of charge (SOC) is monitored to determine the remaining battery charge and health status. Based on the SOC, the system determines whether charging or discharging is necessary. When photovoltaic power generation is insufficient, the energy storage system discharges to support the load, ensuring continuous power supply. When photovoltaic power generation is excessive, charging and storage are performed to avoid energy waste. If the system contains multiple energy storage devices, only one is allowed to connect to the grid, with the others serving as backup.

[0068] At S107 , load management is performed.

[0069] According to example embodiments, load management includes optimizing the load power supply sequence and implementing intelligent load management strategies. Based on load priority and current power availability, the load power supply sequence is optimized to ensure that critical loads receive power first, improving overall system efficiency. Intelligent load management strategies balance system supply and demand, avoid overload and underload conditions, and dynamically adjust load distribution to ensure the optimal use of power resources.

[0070] The method for off-grid microgrid control of multiple networking devices proposed in the present invention controls and traverses multiple energy storage devices, allowing only one energy storage device to be networked each time, and the remaining energy storage devices serve as backup. This method ensures that when photovoltaic power generation meets the load demand, energy storage devices are used for networking first, and that only one device in the system performs load following actions to avoid conflicts. When there are no available energy storage devices in the system for networking, the diesel generator is started to connect to the network to ensure the stability of the frequency and voltage of the power grid. The load management system dynamically adjusts the load distribution according to the load priority and power supply situation, ensures priority power supply to important loads, balances supply and demand, avoids system overload or underload, and improves the overall efficiency and reliability of the system.

[0071] Figure 3 A flow chart illustrating a charging or discharging operation when the energy storage device is a networking device according to an example embodiment.

[0072] See also Figure 3According to an example embodiment, when the energy storage device is a networking device, the remaining power and health status of the battery are determined by monitoring the status of the energy storage device, and whether charging or discharging operations are required is determined based on the SOC.

[0073] In S311 , the current energy storage system number is obtained.

[0074] Obtain the current energy storage device number and detect the charge state of the energy storage device.

[0075] In S313 , it is determined whether the charge state of the energy storage system is lower than the grid charge state lower limit.

[0076] If the charge state of the energy storage device is lower than the lower limit of the grid charge state (i.e. SOC cur ﹤SOC down-vf ), if SOC cur ﹤SOC down-vf , proceed to step S315; if SOC cur ﹥SOC down-vf , perform the judgment of step S317.

[0077] In S315 , the active power of the photovoltaic power generation system is adjusted to charge the energy storage device.

[0078] The calculation formula for charging the energy storage device by adjusting the active power of the photovoltaic power generation system is:

[0079] P delt-zone =P downLmt-vf -P cur-bat

[0080] Among them, SOC cur Energy storage current state of charge, SOC down-vf The lower limit of network charge state, P delt-zone System active power to be distributed, P downLmt-vf Maximum charging active power of network energy storage, P cur-bat Energy storage is currently active.

[0081] In photovoltaic power generation management, the power output of the photovoltaic power generation system is monitored in real time to ensure that the system operates at optimal conditions. A maximum power point tracking algorithm is used to locate the maximum power point of the photovoltaic power generation system, improving photovoltaic power generation efficiency and ensuring that the photovoltaic cell array always operates at its maximum power point. When the photovoltaic power generation exceeds the load demand, the excess photovoltaic energy is stored in the energy storage system for later use, ensuring efficient energy utilization.

[0082] In S317 , it is determined whether the state of charge of the energy storage system is higher than the upper limit of the state of charge of the grid.

[0083] If the state of charge of the energy storage device is higher than the lower limit of the network charge state, it is determined whether the state of charge of the energy storage device is higher than the upper limit of the network charge state (i.e., SOC cur ﹥SOC up-vf ), if SOC cur ﹥SOC up-vf , proceed to step S319; if SOC cur ﹤SOC up-vf , proceed to step S320.

[0084] In S319 , the active power of the photovoltaic power generation system is adjusted to discharge the energy storage device.

[0085] The calculation formula for discharging the energy storage device by adjusting the active power of the photovoltaic power generation system is:

[0086] P delt-zone =Pup Lmt-vf -P cur-bat

[0087] Among them, SOC up-vf Network charge state upper limit, Pup Lmt-vf The maximum discharge active power of the grid energy storage.

[0088] In S320, the absolute value of active power is determined.

[0089] If the charge state of the energy storage device is higher than the lower limit of the network charge state, and the charge state of the energy storage device is lower than the upper limit of the network charge state, an active absolute value judgment is performed.

[0090] Figure 4 A schematic diagram illustrating an operation of increasing or decreasing active power when the energy storage device is a grid-connected device according to an example embodiment.

[0091] See also Figure 4 When the charge state of the energy storage device is higher than the lower limit of the network charge state and lower than the upper limit of the network charge state, the active power absolute value judgment is performed. If the active power absolute value of the energy storage device is less than the set power threshold, the system active power does not need to be adjusted, and the current system remaining load capacity is displayed.

[0092] Assuming the preset power threshold is 50kW, determine:

[0093] |P delt-zone |﹤=50kW,P delt-zone The system's active power to be allocated;

[0094] According to an exemplary embodiment, the absolute value of the active power of the energy storage device is greater than the set power threshold, and the system active power direction to be allocated is determined. If P delt-zone>50kW, the system active power to be distributed is in the direction of increasing active power, and the active power is increased by discharging through the photovoltaic inverter or non-grid energy storage system.

[0095] First, determine whether the PV inverter is controllable. If the PV inverter is controllable, prioritize controlling the PV to increase its active power until it reaches full power. Determine whether adjustment is still required after controlling the PV. If no adjustment is required after controlling the PV, display the remaining power of the system. If adjustment is still required after controlling the PV or the PV inverter is uncontrollable, control the non-grid energy storage to increase its active power until the maximum charge and discharge power is reached. Determine whether adjustment is still required after controlling the non-grid energy storage. If no adjustment is required after controlling the non-grid energy storage, display the remaining power. If adjustment is still required after controlling the non-grid energy storage, continue controlling the diesel generator to increase its active power.

[0096] According to an example embodiment, the absolute value of the active power of the energy storage device is greater than the set power threshold, P delt-zone If the active power is less than -50kW, the system determines that the active power to be distributed is in the direction of reducing the active power, and the active power of the diesel generator is reduced for charging and storage.

[0097] Prioritize reducing the active power of the diesel generator until it shuts down, and determine whether adjustment is still required after controlling the diesel generator; if no adjustment is required after controlling the diesel generator, display the remaining power of the system; if adjustment is still required after controlling the diesel generator, reduce the active power of the non-grid energy storage until other non-grid energy storage is charged at maximum power, and determine whether adjustment is still required after controlling the non-grid energy storage; if no adjustment is required after controlling the non-grid energy storage, display the remaining power of the system; if adjustment is still required after controlling the non-grid energy storage, determine whether the PV inverter is controllable. If the PV inverter is controllable, reduce the active power by controlling the PV. If the PV inverter is uncontrollable, alarm the remaining power of the system.

[0098] Figure 5 A schematic diagram illustrating an operation of increasing or decreasing active power when a diesel generator is a grid-connected device according to an example embodiment.

[0099] See also Figure 5 According to an example embodiment, when a diesel generator is used as a networking device, the number of the current networking diesel generator is obtained, and the active power regulation of the power generation equipment other than the diesel generator is obtained. The calculation formula is:

[0100] P delt-zone =P optimal-diesel -P cur-diesel

[0101] Where: P delt-zone System active power to be distributed, P cur-diesel Diesel generator current active power, P optimal-diesel Optimal active power target for diesel generators.

[0102] Compare the absolute value of the active power regulation amount of the power generation equipment other than the diesel generator with the size of the preset threshold. Assuming that the preset threshold is 50kW, determine |P delt-zone |﹥=50kW,if P delt-zone >=50kW, perform an active power increase operation to determine whether the photovoltaic inverter is controllable. If the photovoltaic inverter is controllable, increase the output power through photovoltaic power generation until it is fully generated, and determine whether adjustment is still required after controlling the photovoltaic power generation. If adjustment is still required after controlling the photovoltaic power generation or the photovoltaic inverter is uncontrollable, increase the energy storage output power to meet the active power increase requirement. If adjustment is not required after controlling the photovoltaic power generation, continue traversing and obtaining the status of the energy storage system and the diesel generator.

[0103] If P delt-zone ﹤=-50kW, perform active power reduction operation, give priority to adjusting the energy storage system, determine whether adjustment is still required after adjusting the energy storage system, if adjustment is still required after adjusting the energy storage system, determine whether the photovoltaic inverter is controllable, if the photovoltaic inverter is controllable, reduce active power through photovoltaic control, if the photovoltaic inverter is uncontrollable or does not need to be adjusted after adjusting the energy storage, continue to traverse and obtain the status of the energy storage system and diesel generator.

[0104] In some embodiments, diesel generators serve as a backup system, activated when no energy storage devices are available within the system for grid connection. Even if photovoltaic power generation can meet load demands, diesel generators must be activated if the energy storage system is unable to connect to the grid to ensure grid frequency and voltage stability. Adjusting the diesel generator's output power based on real-time load demand ensures power supply reliability, avoids overload or underload operation, and increases equipment lifespan.

[0105] This example embodiment monitors and adjusts the active power output of photovoltaic power generation systems, energy storage systems, and diesel generators in real time, allocating it appropriately based on load demand. Through a multi-grid off-grid microgrid control system, photovoltaic power generation and energy storage systems are prioritized for primary power supply, while the buffering effect of grid-connected devices is leveraged to accommodate load fluctuations.

[0106] The present invention's method for controlling off-grid microgrids with multiple network devices prioritizes network management using energy storage systems and implements real-time monitoring and adjustments through an intelligent scheduling algorithm. This solves the problems of collaborative management and load balancing of multiple devices in off-grid microgrids. When the energy storage system fails to meet demand, the intelligent algorithm promptly activates the diesel generator network to ensure grid frequency and voltage stability. Simultaneously, it optimizes power resource utilization, improves system stability and reliability, reduces operating costs and environmental impact, and provides real-time monitoring and fault warnings for operators, improving system maintenance efficiency and response speed, offering a more reliable and economical power solution for remote areas.

[0107] Figure 6 A block diagram of a computing device according to an example embodiment of the present invention is shown.

[0108] like Figure 6 As shown, computing device 30 includes processor 12 and memory 14. Computing device 30 may also include bus 22, network interface 16, and I / O interface 18. Processor 12, memory 14, network interface 16, and I / O interface 18 may communicate with each other via bus 22.

[0109] The processor 12 may include one or more general-purpose CPUs (Central Processing Units, processors), microprocessors, or application-specific integrated circuits, etc., for executing relevant program instructions.

[0110] The memory 14 may include machine-readable media in the form of volatile memory, such as random access memory (RAM), read-only memory (ROM), and / or cache memory. The memory 14 is used to store one or more programs including instructions and data. The processor 12 may read the instructions stored in the memory 14 to execute the method according to the embodiment of the present invention described above.

[0111] The computing device 30 may also communicate with one or more networks via the network interface 16. The network interface 16 may be a wireless network interface.

[0112] The bus 22 may include an address bus, a data bus, a control bus, etc. The bus 22 provides a path for exchanging information between various components.

[0113] It should be noted that, in the specific implementation process, the computing device 30 may also include other components necessary for normal operation. In addition, those skilled in the art will understand that the above-mentioned device may also only include components necessary to implement the embodiments of this specification, and does not necessarily include all components shown in the figure.

[0114] The present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the above method. The computer-readable storage medium may include, but is not limited to, any type of disk, including a floppy disk, an optical disk, a DVD, a CD-ROM, a microdrive and a magneto-optical disk, a ROM, a RAM, an EPROM, an EEPROM, a DRAM, a VRAM, a flash memory device, a magnetic or optical card, a nanosystem (including a molecular memory IC), a network storage device, a cloud storage device, or any type of medium or device suitable for storing instructions and / or data.

[0115] An embodiment of the present invention further provides a computer program product, which includes a non-transitory computer-readable storage medium storing a computer program, and the computer program is operable to cause a computer to execute part or all of the steps of any method described in the above method embodiments.

[0116] Those skilled in the art will readily appreciate that the technical solutions of the present invention can be implemented using software and / or hardware. "Unit" and "module" in this specification refer to software and / or hardware that can independently perform specific functions or work in conjunction with other components. Examples of hardware include field programmable gate arrays and integrated circuits.

[0117] It should be noted that for the aforementioned method embodiments, for simplicity of description, they are all expressed as a series of action combinations. However, those skilled in the art should be aware that the present invention is not limited by the order of the actions described, because according to the present invention, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in this specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

[0118] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0119] In the several embodiments provided herein, it should be understood that the disclosed devices can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of units is merely a logical functional division. In actual implementation, other division methods may be used. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not implemented. In addition, the coupling or direct coupling or communication connection shown or discussed may be through some service interface. The indirect coupling or communication connection of devices or units may be electrical or other forms.

[0120] Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0121] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0122] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable memory. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. This computer software product is stored in a memory and includes a number of instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the various embodiments of the method of the present invention.

[0123] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0124] The exemplary embodiments of the present invention are specifically shown and described above. It should be understood that the present invention is not limited to the detailed structure, configuration or implementation described herein; on the contrary, the present invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended clauses.

[0125] Those skilled in the art will readily appreciate that the technical solutions of the present invention can be implemented using software and / or hardware. "Unit" and "module" in this specification refer to software and / or hardware that can independently perform specific functions or work in conjunction with other components. Examples of hardware include field programmable gate arrays and integrated circuits.

[0126] It should be noted that for the aforementioned method embodiments, for simplicity of description, they are all expressed as a series of action combinations. However, those skilled in the art should be aware that the present invention is not limited by the order of the actions described, because according to the present invention, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in this specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

[0127] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0128] In the several embodiments provided herein, it should be understood that the disclosed devices can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of units is merely a logical functional division. In actual implementation, other division methods may be used. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not implemented. In addition, the coupling or direct coupling or communication connection shown or discussed may be through some service interface. The indirect coupling or communication connection of devices or units may be electrical or other forms.

[0129] Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0130] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0131] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable memory. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. This computer software product is stored in a memory and includes a number of instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the various embodiments of the method of the present invention.

[0132] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0133] The exemplary embodiments of the present invention are specifically shown and described above. It should be understood that the present invention is not limited to the detailed structure, configuration or implementation described herein; on the contrary, the present invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended clauses.

Claims

1. A method for controlling an off-grid microgrid with multiple network devices, characterized in that: The microgrid system includes at least a new energy power generation system, an energy storage system and a diesel generator, the energy storage system includes at least one energy storage device, and the method includes: Initializing and starting the microgrid system, including: confirming that all parts of the microgrid system are in a controllable state and operate normally in an off-grid mode; Determining a networking device includes: controlling and traversing the energy storage system and the diesel generator each time the network is established, preferentially using the energy storage device as the networking device, and ensuring that only one energy storage device is used for each networking; when there is no available energy storage device in the microgrid system for networking, starting the diesel generator as the networking device; Perform energy storage system management, including: When the networking device is the energy storage device, the charge state of the energy storage device is detected. If the charge state of the energy storage device is lower than the lower limit of the networking charge state, the energy storage device is charged by adjusting the active power of the new energy power generation system; if the charge state of the energy storage device is higher than the lower limit of the networking charge state, it is determined whether the charge state of the energy storage device is higher than the upper limit of the networking charge state. If the charge state of the energy storage device is higher than the upper limit of the networking charge state, the energy storage device is discharged by adjusting the active power of the new energy power generation system; if the charge state of the energy storage device is higher than the upper limit of the networking charge state limit, and the charge state of the energy storage device is lower than the upper limit of the grid charge state, perform active power absolute value judgment, the active power absolute value is the absolute value of the difference between the maximum charging active power of the energy storage system and the current active power of the energy storage system; if the active power absolute value of the energy storage device is less than the set power threshold, the system active power does not need to be adjusted; if the active power absolute value of the energy storage device is greater than the set power threshold, if it is judged that the system active power to be allocated is to increase active power, increase active power by discharging the inverter or non-grid energy storage system; if it is judged that the system active power to be allocated is to reduce active power, give priority to reducing the active power of the diesel generator; When the networking device is the diesel generator, the active power regulation amount of the power generation equipment other than the diesel generator is obtained, and the active power is increased or decreased by comparing the absolute value of the active power regulation amount of the power generation equipment other than the diesel generator with the size of the preset threshold. The absolute value of the active power regulation amount of the power generation equipment other than the diesel generator is the absolute value of the difference between the optimal active power target of the diesel generator and the current active power of the diesel generator.

2. The method according to claim 1, characterized in that The energy storage device is charged by adjusting the active power of the new energy power generation system, including: The power output of the new energy power generation system is monitored in real time, and the maximum power point of the new energy power generation system is located using a maximum power point tracking algorithm.

3. The method according to claim 1, characterized in that By comparing the absolute values ​​of the active power regulation amounts of the power generation equipment other than the diesel generator, an active power increasing operation is performed, including: Increase output power through renewable energy power generation systems until full power is achieved; If adjustment is still required after controlling the new energy power generation system, the output power of energy storage can be increased to meet the increase in active power.

4. The method according to claim 1, wherein By comparing the absolute values ​​of the active power regulation amounts of the power generation equipment other than the diesel generator, an active power reduction operation is performed, including: The energy storage system is adjusted first. If further adjustment is still required after the energy storage system is adjusted, the active power is reduced through the new energy power generation system.

5. The method according to claim 1, wherein The method also includes load management, wherein: The buffering effect of the networking equipment is applied to cope with load changes, and load distribution is dynamically adjusted according to load priority and power supply conditions.

6. The method according to claim 1, characterized in that The new energy power generation system includes one or more of a photovoltaic power generation system, a wind power generation system and a geothermal power generation system.

7. A computer program product, characterized in that The invention comprises a computer program, which implements the method according to any one of claims 1 to 6 when being executed by a processor.

8. A computing device, characterized in that include: processor; as well as A memory storing a computer program, which, when executed by the processor, causes the processor to perform the method according to any one of claims 1 to 6.

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