Method for off-grid micro-grid control of multiple networking devices and computing device

Abstract

The invention provides an off-grid micro-grid control method for multiple networking devices and a computing device, and is applied to the technical field of new energy. The method comprises the following steps: initializing and starting a micro-grid system; determining network construction equipment: performing control traversal on the energy storage system and the diesel generator during network construction every time, preferentially using the energy storage equipment as the network construction equipment, and ensuring that only one energy storage equipment is used during network construction every time, and when no available energy storage equipment exists in the micro-grid system for network construction, controlling the energy storage system and the diesel generator to perform network construction. Starting the diesel generator as the network construction equipment; and performing energy storage system management, and performing active power increasing or active power decreasing operation. By using the method of the invention, stable operation of the micro-grid can be ensured.

Description

Technical Field

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

[0002] In areas where it is difficult to access the main power grid or the power supply is unstable, the off-grid microgrid system is an important means to solve the problem of power supply in remote areas. The off-grid microgrid system has the ability to operate independently. It integrates various local power generation resources, such as solar energy, wind energy and other renewable energy and energy storage systems to supply power. It can achieve regional power self-sufficiency without the support of the large power grid. Through diversified energy supply and energy storage, the off-grid microgrid can provide a stable power supply, reduce the risk of power outages, and improve the quality of power services.

[0003] However, due to the lack of connection to the main power grid, it becomes a challenge 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.

[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 off-grid microgrid control of multi-network equipment, which can effectively manage and dispatch various devices 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 for multi-grid equipment is provided, wherein the microgrid system comprises at least a new energy power generation system, an energy storage system and a diesel generator, wherein the energy storage system comprises at least one energy storage device, and the method comprises:

[0007] Initializing and starting the microgrid system, including: confirming that each part of the microgrid system is in a controllable state and operates normally in an off-grid mode;

[0008] Determining a networking device, including: controlling and traversing the energy storage system and the diesel generator each time the network is built, giving priority to using the energy storage device as the networking device, and ensuring that there is only one energy storage device for each networking, and 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, charge state detection and active power absolute value judgment are performed, and whether charging or discharging operation is required is judged according to 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 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 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, 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 charge state of the energy storage device is higher than the lower limit of the grid charge state, determine whether the charge state of the energy storage device is higher than the upper limit of the grid charge state, and if the charge state 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 grid charge state, and the charge state of the energy storage device is lower than the upper limit of the grid 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 active power to be allocated in the system is to increase the active power, and the active power is increased by discharging the inverter or the non-grid energy storage system. If it is judged that the direction of the active power to be allocated in the system is to reduce the active power, the active power of the diesel generator is reduced for charging and storage.

[0018] According to some embodiments, the active power increasing operation is performed by comparing the absolute values ​​of the active power regulation amounts of the power generation equipment other than the diesel generator, including:

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

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

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

[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 above 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, and when the computer program is executed by the processor, the processor is caused to perform any of the aforementioned methods.

[0030] According to the 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 the off-grid mode, ensuring the safe operation of the system after startup and not being affected by the fluctuation of the external power grid, thereby improving the reliability of the system; giving priority to the use of energy storage devices can improve energy utilization efficiency, ensuring that only one energy storage device is used to build the network each time, which can save energy and facilitate management, without worrying about coordination problems 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 increasing or decreasing the active power.

[0031] The present invention can perform flexible power dispatching, quickly respond to changes in the power grid, and improve the stability of the microgrid by adjusting the energy storage system. By dynamically adjusting the load distribution, it can ensure that each load can get enough power supply, which can not only improve the power supply quality but also improve the utilization rate of energy.

[0032] It is to 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 drawings required for describing the embodiments are briefly introduced below.

[0034] Figure 1 A flow chart showing 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 a networking device according to an example embodiment is shown.

[0036] Figure 3 A flow chart showing 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 is shown of performing an active power increase or active power decrease operation when the energy storage device is a grid-building device according to an example embodiment.

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

[0039] Figure 6 A block diagram of a computing device according to an example embodiment of the 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 implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar parts, and thus their repeated description 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, those skilled in the art will appreciate that the technical solution 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 independent entities. That is, these functional entities may be implemented in software form, or 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 only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[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 component. Therefore, the first component discussed below can 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 of the associated listed items and all combinations of one or more.

[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 appreciate 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 protection scope of the present invention.

[0047] Off-grid microgrid systems have the ability to operate independently. By integrating various local power generation resources, such as photovoltaic power generation, wind power generation, and diesel generators, they can achieve regional power self-sufficiency without the support of large power grids. However, the lack of effective collaborative management between local power generation resources has led to many problems in actual operation. For example, when the photovoltaic power generation is insufficient, the untimely scheduling of the energy storage system and diesel generators may lead to insufficient power supply; and when the photovoltaic power generation is excessive, the energy storage system fails to make full use of the excess electricity, causing system overload and energy waste. In addition, the real-time monitoring of the status of each device and fault warning during the operation of the system increase the difficulty of operation and maintenance.

[0048] The present invention proposes a method for controlling an off-grid microgrid of 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 of the battery to its capacity when fully charged.

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

[0052] According to some embodiments, the grid-building 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-building 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 of multi-grid equipment, which realizes the optimal configuration of power resources and the 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 the exemplary embodiment, 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. In the following, the present invention takes the photovoltaic power generation system as an example as the power generation equipment in the microgrid. The photovoltaic power generation system uses solar energy to generate electricity, which has the advantages of being clean, renewable and pollution-free. However, due to the instability of its power generation, an energy storage system and a diesel generator are required as network equipment to support the stable operation of the entire system.

[0055] The grid-type energy storage system can mimic the behavior of synchronous generators, provide the necessary inertia and short-circuit capacity, and 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 electrical energy, release electrical energy when power generation is insufficient, balance power supply and demand, and ensure the continuity and stability of power supply. The energy storage system is flexible and controllable, with strong buffering capacity; diesel generators serve as backup power sources, providing emergency power support when both photovoltaic power generation systems and energy storage systems cannot meet demand, thereby ensuring the reliability of the power system.

[0056] In the off-grid microgrid control system of the multi-grid equipment, 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 the diesel generator to ensure the frequency and voltage stability of the power grid.

[0057] In the multi-grid off-grid microgrid proposed by the present invention, the photovoltaic power generation system is responsible for the main power supply task, and the networking equipment is used as an auxiliary to achieve reasonable distribution of power load through intelligent scheduling. The entire microgrid system adjusts the active output of each power generation equipment according to the real-time load situation to ensure that the active power of the networking equipment is stable at the set value to maintain the balance and stability of the system.

[0058] Figure 1 A flow chart showing 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 the example embodiment, during the system initialization and startup phase, it is necessary to confirm that various 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, the energy storage system, the diesel generator, etc., is detected to ensure the normal operation of the equipment.

[0062] In S103, a 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 monitors the voltage and frequency in the power grid in real time, adjusts the output parameters of the equipment, and maintains stability. At the same time, the networking equipment adjusts the active output according to the changes in the load, which plays a buffering role. 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 about half of its rated power, so that it can respond quickly when the load suddenly increases or decreases, avoiding large fluctuations in the power grid.

[0064] According to the example embodiment, each time the network is constructed, the energy storage system and the diesel generator are controlled and traversed, the status of the energy storage system and the diesel generator is obtained, and it is checked whether there is a network construction device. If there is no network construction device, an alarm is triggered; if there is a network construction device, the energy storage device is used as the network construction device first, and it is ensured that there is only one energy storage device for each network construction. When there is no available energy storage device in the microgrid system for network construction, the diesel generator is started as the network construction device (see the flowchart for confirming the network construction 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 according to 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 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.

[0067] In the networking mode, the energy storage system needs to be controlled and traversed first to ensure that only one energy storage device can be networked each time. First, monitor the state of the energy storage system (SOC) to determine the remaining power and health status of the battery, and determine whether charging or discharging operations are required based on the SOC. When the photovoltaic power generation is insufficient, the energy storage system discharges to support the load to ensure the continuity of power supply; when the photovoltaic power generation is in excess, charging and storage are performed to avoid energy waste. If there are multiple energy storage devices in the system, only one of them is allowed to be networked, and the other energy storage devices are used as backup.

[0068] At S107 , load management.

[0069] According to an example embodiment, load management includes optimizing the load power supply sequence and intelligent load management strategy. According to the priority of the load and the current power supply situation, the load power supply sequence is optimized to ensure that important loads are given priority in power supply and improve the overall efficiency of the system. Through the intelligent load management strategy, the supply and demand of the system are balanced, overload and underload are avoided, and the load distribution is dynamically adjusted to ensure the rational use of power resources.

[0070] The method for controlling an off-grid microgrid with multiple networking devices proposed in the present invention controls and traverses multiple energy storage devices, and only allows one energy storage device to build a network each time, and the remaining energy storage devices are used 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 is no available energy storage device in the system for networking, the diesel generator is started to connect to the network to ensure that the frequency and voltage of the power grid are stable. The load management system dynamically adjusts the load distribution according to the load priority and power supply conditions to ensure priority power supply to important loads, balance supply and demand, avoid system overload or underload, and improve the overall efficiency and reliability of the system.

[0071] Figure 3 A flow chart showing 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 lower limit of the grid charge state.

[0076] If the charge state of the energy storage device is lower than the lower limit of the network 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 allocated, 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 in the best state. The maximum power point tracking algorithm is used to locate the maximum power point of the photovoltaic power generation system, improve the photovoltaic power generation efficiency, and ensure that the photovoltaic cell array always operates at the maximum power point. When the photovoltaic power generation power exceeds the load demand, the excess photovoltaic power is stored in the energy storage system for later use to ensure the effective use of energy.

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

[0083] If the charge state of the energy storage device is higher than the lower limit of the network charge state, it is determined whether the charge state 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 , perform the judgment of 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 grid charge state, and the charge state of the energy storage device is lower than the upper limit of the grid charge state, an active absolute value judgment is performed.

[0090] Figure 4 A schematic diagram is shown of performing an active power increase or active power decrease operation when the energy storage device is a grid-building 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 is judged. 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 It is the system 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 to be allocated is determined. If P delt-zone>50kW, the active power to be allocated in the system is to increase the 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 photovoltaic inverter is controllable. If the photovoltaic inverter is controllable, give priority to controlling the photovoltaic to increase active power until full power is generated; determine whether adjustment is still required after controlling the photovoltaic. If adjustment is no longer required after controlling the photovoltaic, display the remaining power of the system; if adjustment is still required after controlling the photovoltaic or the photovoltaic inverter is uncontrollable, control the non-grid energy storage to increase 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 adjustment is not 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, continue to control the diesel generator to increase 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 ﹤-50kW, it is judged that the active power to be allocated in the system is to reduce the active power, and charging and storage are carried out by reducing the active power of the diesel generator.

[0097] Prioritize reducing the active power of the diesel generator until it stops, and judge whether it still needs to be adjusted after controlling the diesel generator; if no adjustment is needed after controlling the diesel generator, display the remaining power of the system; if adjustment is still needed after controlling the diesel generator, reduce the active power of the non-grid energy storage until other non-grid energy storage are charged at maximum power, and judge whether it still needs to be adjusted after controlling the non-grid energy storage; if no adjustment is needed after controlling the non-grid energy storage, display the remaining power of the system; if adjustment is still needed after controlling the non-grid energy storage, judge whether the photovoltaic inverter is controllable. If the photovoltaic inverter is controllable, reduce the active power by controlling the photovoltaic. If the photovoltaic inverter is uncontrollable, alarm the remaining power of the system.

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

[0099] See also Figure 5 According to the 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 amount 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 allocated, P cur-diesel The current active power of the diesel generator, 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 preset threshold value, assuming that the preset threshold value is 50kW, and judge |P delt-zone |﹥=50kW,if P delt-zone ﹥=50kW, perform active power increase operation to determine whether the photovoltaic inverter is controllable. If the photovoltaic inverter is controllable, increase the output power through photovoltaic until full power is generated, and determine whether adjustment is still required after controlling photovoltaic; if adjustment is still required after controlling photovoltaic or the photovoltaic inverter is uncontrollable, increase the energy storage output power to meet the active power increase; if no adjustment is required after controlling photovoltaic, continue to traverse and obtain 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 it still needs to be adjusted after adjusting the energy storage, if it still needs to be adjusted 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 the diesel generator.

[0104] According to some embodiments, the diesel generator is used as a backup system. When there is no available energy storage device in the system to build a network, the diesel generator is started to build a network. Even if photovoltaic power generation can meet the load demand, when the energy storage system cannot build a network, the diesel generator must be started to ensure the frequency and voltage stability of the power grid. According to the real-time load demand, the output power of the diesel generator is adjusted to ensure the reliability of power supply, avoid overload or underload operation, and improve the service life of the equipment.

[0105] This example embodiment monitors and adjusts the active output of photovoltaic power generation systems, energy storage systems, diesel generators and other equipment in real time, and distributes them reasonably according to load demand. Through the multi-grid device off-grid microgrid control system, photovoltaic power generation and energy storage equipment are preferentially used to provide the main power supply tasks, while the buffering effect of the grid device is used to cope with load changes.

[0106] The method for controlling off-grid microgrids with multiple network devices of the present invention gives priority to using energy storage systems for network management, and performs real-time monitoring and adjustment through intelligent scheduling algorithms, solving the problems of multi-device collaborative management and load balancing in off-grid microgrids; when the energy storage system cannot meet the demand, the intelligent algorithm promptly starts the diesel generator network to ensure the stability of the grid frequency and voltage. At the same time, it optimizes the utilization of power resources, improves the stability and reliability of the system, reduces operating costs and environmental impacts, provides real-time monitoring and fault warnings for operation and maintenance personnel, improves the maintenance efficiency and response speed of the system, and provides more reliable and economical power solutions for remote areas.

[0107] Figure 6 A block diagram of a computing device according to an example embodiment of the 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 a machine system readable medium in the form of a volatile memory, such as a random access memory (RAM), a read-only memory (ROM) and / or a cache memory. The memory 14 is used to store one or more programs including instructions and data. The processor 12 can read the instructions stored in the memory 14 to execute the above-mentioned method according to the embodiment of the present invention.

[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 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 may understand that the above device may only include components necessary for implementing the embodiments of this specification, and need not 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 implements the steps of the above method when executed by a processor. 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 card or an 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 also 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 recorded in the above method embodiments.

[0116] Those skilled in the art can clearly understand that the technical solution of the present invention can be implemented with the help of software and / or hardware. "Unit" and "module" in this specification refer to software and / or hardware that can independently complete or cooperate with other components to complete specific functions, where the hardware can be, for example, a field programmable gate array, an integrated circuit, etc.

[0117] It should be noted that, for the above-mentioned method embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence, because according to the present invention, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the 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 emphasis. 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 by the present invention, it should be understood that the disclosed devices can be implemented in other ways. For example, the device embodiments described above are only schematic, such as the division of units, which is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some service interfaces, and the indirect coupling or communication connection of devices or units can be electrical or other forms.

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

[0121] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0122] If the integrated unit is implemented in the form of 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 is essentially or the part that contributes to the prior art or the whole or part of the technical solution can be embodied in the form of a software product, which is stored in a memory and includes several instructions for a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the methods of various embodiments of the present invention.

[0123] In the above embodiments, the description of each embodiment has its own emphasis. 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 structures, configurations or implementations described herein; on the contrary, the present invention is intended to cover various modifications and equivalent configurations included in the spirit and scope of the appended clauses.

[0125] Those skilled in the art can clearly understand that the technical solution of the present invention can be implemented with the help of software and / or hardware. "Unit" and "module" in this specification refer to software and / or hardware that can independently complete or cooperate with other components to complete specific functions, where the hardware can be, for example, a field programmable gate array, an integrated circuit, etc.

[0126] It should be noted that, for the above-mentioned method embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence, because according to the present invention, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the 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 emphasis. 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 by the present invention, it should be understood that the disclosed devices can be implemented in other ways. For example, the device embodiments described above are only schematic, such as the division of units, which is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some service interfaces, and the indirect coupling or communication connection of devices or units can be electrical or other forms.

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

[0130] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0131] If the integrated unit is implemented in the form of 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 is essentially or the part that contributes to the prior art or the whole or part of the technical solution can be embodied in the form of a software product, which is stored in a memory and includes several instructions for a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the methods of various embodiments of the present invention.

[0132] In the above embodiments, the description of each embodiment has its own emphasis. 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 structures, configurations or implementations described herein; on the contrary, the present invention is intended to cover various modifications and equivalent configurations included in the spirit and scope of the appended clauses.

Claims

1. A method for controlling off-grid microgrids of multi-network equipment, 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 each part of the microgrid system is in a controllable state and operates normally in an off-grid mode; Determining a networking device, including: controlling and traversing the energy storage system and the diesel generator each time the network is built, giving priority to using the energy storage device as the networking device, and ensuring that there is only one energy storage device for each networking, and when there is no available energy storage device in the microgrid system for networking, starting the diesel generator as the networking device; The energy storage system is managed, including: 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 according to 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 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 preset threshold.

2. The method according to claim 1, characterized in that Determining whether a charging or discharging operation is required according to the charge state includes: Detecting the charge state of the energy storage device, 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; If the charge state of the energy storage device is higher than the lower limit of the grid charge state, determine whether the charge state of the energy storage device is higher than the upper limit of the grid charge state, and if the charge state 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; If the charge state of the energy storage device is higher than the lower limit of the grid charge state, and the charge state of the energy storage device is lower than the upper limit of the grid charge state, an active absolute value judgment is performed.

3. The method according to claim 2, 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 renewable energy power generation system is monitored in real time, and the maximum power point of the renewable energy power generation system is located using a maximum power point tracking algorithm.

4. The method according to claim 1, characterized in that: When the networking device is an energy storage device, the charge state detection and active power absolute value judgment are performed, including: 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, performing active power absolute value judgment; 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 determined that the system active power to be allocated is increasing. Case number: 240722CI Active power is increased by discharging through an inverter or a non-grid energy storage system. If it is determined that the active power to be allocated by the system is to reduce the active power, charging and storage are performed by reducing the active power of the diesel generator.

5. 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 increase operation is performed, including: Increase output power through renewable energy power generation systems until full power is achieved; If adjustment is still needed after controlling the new energy power generation system, the output power of energy storage can be increased to meet the increased active power.

6. 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 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.

7. The method according to claim 1, characterized in that 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.

8. 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.

9. A computer program product, characterized in that The method comprises a computer program, which implements the method according to any one of claims 1 to 8 when being executed by a processor.

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

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