Control method of wind-solar-storage device networking system and wind-solar-storage device networking system

Abstract

The application discloses a kind of wind and light storage equipment networking system control method and wind and light storage equipment networking system, it is related to wind and light storage equipment networking system technical field.The wind and light storage equipment networking system includes bus and multiple parallelly arranged wind and light storage equipment on the bus, the control method of wind and light storage equipment networking system includes: in the case where wind and light storage equipment networking system is in working condition, based on the working condition of multiple wind and light storage equipment, determine wind and light storage equipment host and wind and light storage equipment slave in multiple wind and light storage equipment;Each wind and light storage equipment slave is based on the ac reference voltage output by wind and light storage equipment host, regulates and controls the ac voltage output by itself;Wind and light storage equipment host is based on the rated power and residual quantity of each wind and light storage equipment, and the total power required by load, regulates and controls the output power of each wind and light storage equipment.The application aims at improving the flexibility when multiple wind and light storage equipment networking.

Description

Technical Field

[0001] This invention relates to the field of wind, solar and energy storage equipment networking systems, and particularly to a control method and a wind, solar and energy storage equipment networking system. Background Technology

[0002] A wind-solar-storage integrated power unit is a new type of multi-energy complementary power equipment that highly integrates wind power generation, photovoltaic power generation, and energy storage systems. Through an intelligent energy management system and power electronic control technology, it converts wind and solar energy into electrical energy, prioritizing power supply to the load and storing excess energy in energy storage batteries. When wind and solar resources are insufficient, the energy is supplemented by energy storage or backup power sources (such as diesel generators or grid power), thereby achieving synergistic optimization and seamless switching of multiple energy sources.

[0003] However, a single integrated wind-solar-storage turbine cannot provide stable power supply when facing high-power loads. Existing technologies include parallel operation of multiple identical integrated wind-solar-storage turbines to significantly increase the system's total output power and energy storage capacity. However, existing multi-unit parallel expansion solutions lack a unified synchronization control mechanism, and the failure of a single unit can easily paralyze the entire power supply system. Therefore, existing multi-unit parallel expansion solutions suffer from poor flexibility, requiring users to adjust them according to their specific circumstances. Summary of the Invention

[0004] The main objective of this invention is to provide a control method and a network system for wind, solar and energy storage devices, aiming to improve the flexibility of networking multiple wind, solar and energy storage devices.

[0005] To achieve the above objectives, this invention proposes a control method for a wind-solar-storage equipment networking system. The wind-solar-storage equipment networking system includes a bus and multiple wind-solar-storage equipment connected in parallel to the bus. The control method for the wind-solar-storage equipment networking system includes: When the wind-solar-storage equipment networking system is in operation, the master and slave units of the wind-solar-storage equipment are determined based on the working status of multiple wind-solar-storage equipment. Each wind, solar and energy storage device slave unit acquires the amplitude, phase and frequency of the AC reference voltage output by the main unit of the wind, solar and energy storage device, and outputs an AC voltage with the same amplitude, phase and frequency as the AC reference voltage output by the main unit of the wind, solar and energy storage device based on the amplitude, phase and frequency of the AC reference voltage output by the main unit of the wind, solar and energy storage device. The main unit of the wind, solar and energy storage system adjusts the output power of each wind, solar and energy storage device based on the rated power and remaining power of each device, as well as the total power required by the load. The step of determining the main unit and slave unit of the wind, solar, and energy storage equipment based on the working status of multiple wind, solar, and energy storage devices specifically includes: When each wind, solar and energy storage device is in operation, each device will broadcast its own operating status signal within a preset area and receive the operating status signals broadcast by other wind, solar and energy storage devices within the preset area. Based on a preset weighting algorithm and the working status signals of each wind, solar and energy storage device, the master and slave devices of the wind, solar and energy storage devices are determined.

[0006] In one embodiment, the step of determining the master and slave units of the wind-solar-storage equipment based on a preset weighting algorithm and the operating status signals of each wind-solar-storage equipment specifically includes: A preset weighting algorithm is constructed based on preset remaining power coefficient, preset health level coefficient, and preset real-time power generation coefficient; Based on a preset weighting algorithm and the remaining power signal, health status signal, and real-time power generation signal of each wind, solar, and energy storage device, the master and slave devices of the wind, solar, and energy storage devices are determined.

[0007] In one embodiment, the step of each slave unit of the wind-solar-storage equipment adjusting its own output AC voltage based on the AC reference voltage output by the master unit of the wind-solar-storage equipment specifically includes: Each wind, solar, and energy storage device slave unit acquires the amplitude, phase, and frequency of the AC reference voltage output by the main unit of the wind, solar, and energy storage device, and outputs an AC voltage with the same amplitude, phase, and frequency as the AC reference voltage output by the main unit of the wind, solar, and energy storage device.

[0008] In one embodiment, the step of the main unit of the wind-solar-storage equipment adjusting the output power of each wind-solar-storage device based on the rated power and remaining power of each device, as well as the total power required by the load, specifically includes: The main unit of the wind, solar and energy storage equipment obtains its own rated power signal, remaining power signal, and the rated power signal, remaining power signal, and total power required by the load of each slave unit of the wind, solar and energy storage equipment, in order to determine the rated power and remaining power of each wind, solar and energy storage equipment. Based on the rated power and remaining power of each wind, solar and energy storage device, as well as the total power required by the load, the active power signal and reactive power signal of each wind, solar and energy storage device are broadcast.

[0009] In one embodiment, the wind-solar-storage equipment networking system further includes a power switching device with multiple load connection terminals. After the step of the wind-solar-storage equipment host adjusting the output power of each wind-solar-storage equipment based on the rated power and remaining power of each wind-solar-storage equipment and the total power required by the load, the method further includes: When the power supply switching equipment is electrically connected to the busbar and multiple loads respectively, determine the power supply priority of multiple loads; If the total output power of each wind, solar and energy storage device is less than the total power required by multiple loads, the power supply path between the wind, solar and energy storage device network system and the corresponding load is disconnected based on the power supply priority of the load.

[0010] In one embodiment, when each wind, solar and energy storage device is in operation, each device will output a working detection signal when the interval reaches a preset duration. Based on the working detection signals, the working status of each wind, solar and energy storage device is determined; If any wind, solar, or energy storage device is in a fault state, the device in the fault state is disconnected from the bus, and the output power of each wind, solar, or energy storage device that is not in a fault state is adjusted.

[0011] In one embodiment, the step of controlling the faulty wind, solar, and energy storage devices to disconnect their electrical connection with the bus and adjusting the output power of the non-faulty wind, solar, and energy storage devices when any of them is in a faulty state specifically involves: If the wind, solar and energy storage device in a faulty state is the main unit of the wind, solar and energy storage device, each wind, solar and energy storage device that is not in a faulty state will re-determine the main unit and slave unit of the wind, solar and energy storage device based on its own working status. The system controls the disconnection of the electrical connection between the wind, solar, and energy storage devices that are in a faulty state and the bus, and regulates the output power of each wind, solar, and energy storage device that is not in a faulty state.

[0012] The present invention also proposes a wind-solar-storage equipment networking system, the wind-solar-storage equipment networking system comprising: busbar; Multiple wind, solar and energy storage devices are connected in parallel on the busbar; the wind, solar and energy storage devices are used to convert wind energy and solar energy into electrical energy and output it. The wind, solar, and energy storage equipment includes a control device, which includes a memory, a processor, and a control program for the wind, solar, and energy storage equipment networking system stored in the memory and executable on the processor. The control program for the wind, solar, and energy storage equipment networking system is configured to implement the steps of the control method for the wind, solar, and energy storage equipment networking system as described in any of the above claims.

[0013] In one embodiment, the wind-solar-storage equipment networking system further includes a power supply switching device, which is electrically connected to the bus and includes multiple load connection terminals for connecting loads; the power supply switching device is used to connect or disconnect the power supply path between the load and the bus.

[0014] This invention provides a control method for a wind-solar-storage equipment networking system, which effectively improves the flexibility of networking multiple wind-solar-storage equipment. The network system includes a bus and multiple wind-solar-storage equipment connected in parallel to the bus. When the network system is operational, based on the operating status of the multiple equipment, the master and slave units of each equipment are determined. Each slave unit acquires the amplitude, phase, and frequency of the AC reference voltage output by the master unit and outputs an AC voltage with the same amplitude, phase, and frequency as the master unit. The master unit adjusts the output power of each equipment based on its rated power, remaining power, and the total power required by the load. This method allows multiple wind-solar-storage equipment connected to the bus to form a virtual power plant, providing stable power supply to high-power loads. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 This is a flowchart illustrating the control method of the wind-solar-storage equipment networking system of the present invention; Figure 2 This is a flowchart illustrating an embodiment of the control method for the wind-solar-storage equipment networking system of the present invention; Figure 3 This is a flowchart illustrating another embodiment of the control method for the wind-solar-storage equipment networking system of the present invention; Figure 4 This is a flowchart illustrating another embodiment of the control method for the wind-solar-storage equipment networking system of the present invention; Figure 5 A flowchart illustrating another embodiment of the control method for the wind-solar-storage equipment networking system of the present invention; Figure 6 This is a flowchart illustrating another embodiment of the control method for the wind-solar-storage equipment networking system of the present invention; Figure 7 This is a flowchart illustrating another embodiment of the control method for the wind-solar-storage equipment networking system of the present invention; Figure 8 This is a schematic diagram of the structure of an embodiment of the wind-solar-storage equipment networking system of the present invention; Figure 9This is a schematic diagram of another embodiment of the wind-solar-storage equipment networking system of the present invention.

[0017] Explanation of icon numbers: 10. Busbars; 20. Wind, solar and energy storage equipment.

[0018] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0021] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0022] A wind-solar-storage integrated power unit is a new type of multi-energy complementary power equipment that highly integrates wind power generation, photovoltaic power generation, and energy storage systems. Through an intelligent energy management system and power electronic control technology, it converts wind and solar energy into electrical energy, prioritizing power supply to the load and storing excess energy in energy storage batteries. When wind and solar resources are insufficient, the energy is supplemented by energy storage or backup power sources (such as diesel generators or grid power), thereby achieving synergistic optimization and seamless switching of multiple energy sources.

[0023] However, a single integrated wind-solar-storage turbine cannot provide stable power supply when facing high-power loads. Existing technologies include parallel operation of multiple identical integrated wind-solar-storage turbines to significantly increase the system's total output power and energy storage capacity. However, existing multi-unit parallel expansion solutions lack a unified synchronization control mechanism, and the failure of a single unit can easily paralyze the entire power supply system. Therefore, existing multi-unit parallel expansion solutions suffer from poor flexibility, requiring users to adjust them according to their specific circumstances.

[0024] To solve the above problems, refer to Figure 1 and Figure 8 , Figure 9 This invention proposes a control method for a wind-solar-storage equipment networking system. The wind-solar-storage equipment networking system includes a bus 10 and multiple wind-solar-storage equipment 20 connected in parallel on the bus 10. The control method for the wind-solar-storage equipment networking system includes: Step S100: When the wind-solar-storage equipment networking system is in operation, based on the operating status of multiple wind-solar-storage equipment, determine the wind-solar-storage equipment master and wind-solar-storage equipment slave among the multiple wind-solar-storage equipment. Step S200: Each wind-solar-storage equipment slave device acquires the amplitude, phase, and frequency of the AC reference voltage output by the wind-solar-storage equipment master device, and outputs an AC voltage with the same amplitude, phase, and frequency as the AC reference voltage output by the wind-solar-storage equipment master device based on the amplitude, phase, and frequency of the AC reference voltage output by the wind-solar-storage equipment master device. Step S300: The main unit of the wind, solar and energy storage equipment adjusts the output power of each wind, solar and energy storage equipment based on the rated power and remaining power of each equipment, as well as the total power required by the load.

[0025] In this embodiment, the busbar 10 can be configured as one or more depending on the structure of the wind, solar, and energy storage device 20. For example, when the wind, solar, and energy storage device 20 itself does not have two power connection terminals and a busbar 10 connecting the two power connection terminals, that is, when the wind, solar, and energy storage device 20 has only one output interface, it is necessary to use a busbar 10 with multiple power input connection terminals to connect multiple wind, solar, and energy storage devices 20 in parallel. When the wind, solar, and energy storage device 20 itself has two power connection terminals and a busbar 10 connecting the two power connection terminals, that is, multiple wind, solar, and energy storage devices 20 can be interconnected through multiple busbars 10 to construct a parallel output power from multiple wind, solar, and energy storage devices 20. Furthermore, when the wind, solar, and energy storage device 20 itself has two power connection terminals and a busbar 10 connecting the two power connection terminals, each wind, solar, and energy storage device 20 can have a retractable busbar 10 built into each of the two power connection terminals to facilitate the interconnection of multiple wind, solar, and energy storage devices 20, thereby quickly constructing a virtual power plant that meets the power demand of the load.

[0026] In this embodiment, when each wind, solar, and energy storage device 20 is connected and generating power, the network of multiple wind, solar, and energy storage devices 20 is completed, forming a complete wind, solar, and energy storage network system, which is also in operation. At this time, each wind, solar, and energy storage device 20 is in an independent power generation and storage phase, and there is no power interaction or communication between them. However, after the multiple wind, solar, and energy storage devices 20 are networked, they need to communicate to confirm each other's operating status to ensure the stability of the power output by the network system. The communication between the wind, solar, and energy storage devices 20 can be wired or wireless. Wired communication can be implemented using CAN bus communication, while wireless communication can be implemented using a WiFi Mesh distributed broadcast mechanism, achieving interconnection of multiple wind, solar, and energy storage devices 20 based on Mesh nodes. When multiple wind, solar, and energy storage devices 20 are connected using a WiFi Mesh distributed broadcast mechanism, the effective coverage radius of a single Mesh node is typically between 20 and 50 meters. Therefore, when there are many wind-solar-storage devices 20 or when the distance between two of them is far, relay equipment can be used to expand the communication range, enabling any wind-solar-storage device 20 to communicate and interconnect with any other wind-solar-storage device 20 in the wind-solar-storage network system. It is understood that each wind-solar-storage device 20 is equipped with corresponding detection components to monitor its own operating status, such as rated power, remaining power, and real-time power generation. Furthermore, among the multiple wind-solar-storage devices 20, one needs to be designated as the master device, and the remaining devices as slave devices, thereby achieving unified control of the wind-solar-storage network system. In this embodiment, each wind-solar-storage device 20 will determine its master and slave devices based on its own operating status. It is understood that the master device controls the remaining slave devices. Therefore, the main unit of the wind-solar-storage equipment needs to be more stable than the slave units of the wind-solar-storage equipment in order to reduce the probability that the failure of the wind-solar-storage equipment in the wind-solar-storage equipment networking system is not due to the main unit of the wind-solar-storage equipment.

[0027] In this embodiment, the main unit of the wind, solar, and energy storage system first outputs an AC reference voltage, allowing the slave units to adjust their own output AC voltage based on this reference voltage. It is understood that even if multiple wind, solar, and energy storage devices 20 are of the same model, slight variations in hardware parameters such as output impedance and filter inductance of different power modules may exist during manufacturing. Furthermore, the voltage and current sampling circuits of each power module may have accuracy errors, or the response time of the control algorithm may be asynchronous. Therefore, when multiple wind, solar, and energy storage devices 20 are connected in parallel, if their output voltage amplitudes are not completely equal, or if there is a slight phase deviation, according to Kirchhoff's voltage law, the voltage difference will generate current between the power supplies, thus forming a circulating current. This circulating current does not perform external work but will generate additional heat loss inside the power supply and on the lines. Excessive circulating current will increase the current stress on power devices, causing severe overheating and even burning out the equipment. In addition, circulating current will also cause distortion of the output voltage waveform, reducing the overall stability and reliability of the wind, solar, and energy storage network system. Therefore, the main unit of the wind, solar and energy storage equipment will first output the AC reference voltage so that the slave unit of the wind, solar and energy storage equipment can detect the AC reference voltage on bus 10 and adjust its own output AC voltage to ensure that the AC voltage output by the slave unit of the wind, solar and energy storage equipment is consistent with the AC reference voltage.

[0028] In this embodiment, after the main unit of the wind, solar and energy storage equipment is determined, the main unit will use the AC voltage output by its own inverter as the AC reference voltage and output it. Each slave unit of the wind, solar and energy storage equipment will collect the voltage and frequency signals of bus 10 in real time through the voltage sampling circuit, so that its own VSG controller tracks the phase and frequency of the AC reference voltage through the phase-locked loop, and at the same time simulates the rotor motion equation and external characteristics of the synchronous generator, adjusts the output of its own inverter, and then outputs an AC voltage with the same amplitude, phase and frequency as the AC reference voltage.

[0029] In this embodiment, the real-time power generation of the wind-solar-storage equipment 20 is not stable. However, the equipment can store the generated electricity using its own energy storage device and output the corresponding AC voltage via an inverter. Therefore, the AC voltage output by the equipment is stable, but the real-time power generation and the total power required by the load are not stable. Therefore, the main unit of the wind-solar-storage equipment adjusts the output power of each equipment based on its rated power, remaining power, and the total power required by the load to ensure that the grid system can stably supply power to the load or provide long-term power to important loads. For example, when the environment of the grid system is cloudy, the photovoltaic devices in the equipment will experience a decrease in real-time power generation; similarly, when the environment is windless or has weak winds, the wind power generation devices in the equipment will experience a decrease in real-time power generation. In this situation, the real-time power generation of the wind-solar-storage grid system will decrease, causing the output power of each wind-solar-storage unit 20 to fall below the total power required by the load. Consequently, the power output of each wind-solar-storage unit 20 will be reduced while supplying power to the load. Therefore, the main unit of the wind-solar-storage grid system needs to regulate the output power of each wind-solar-storage unit 20 to ensure that the grid system supplies power to higher-priority loads, thereby ensuring that the grid system can provide stable power to higher-priority loads.

[0030] By employing a control method for a wind-solar-storage equipment networking system, the flexibility of networking multiple wind-solar-storage equipment 20 can be effectively improved. The wind-solar-storage equipment networking system includes a bus 10 and multiple wind-solar-storage equipment 20 connected in parallel to the bus 10. When the wind-solar-storage equipment networking system is in operation, based on the operating status of the multiple wind-solar-storage equipment 20, the master and slave units of the multiple wind-solar-storage equipment 20 are determined. Each slave unit adjusts its own output AC voltage based on the AC reference voltage output by the master unit. The master unit adjusts the output power of each wind-solar-storage equipment 20 based on its rated power, remaining power, and the total power required by the load. In this way, multiple wind-solar-storage equipment 20, after being connected to the bus 10, can be constructed into a virtual power plant, thereby providing stable power supply to high-power loads.

[0031] refer to Figure 2 and Figure 8 , Figure 9 Optionally, the step of determining the master and slave units of the wind-solar-storage equipment based on the working status of multiple wind-solar-storage equipment specifically includes: Step S110: When each wind, solar and energy storage device is in operation, each wind, solar and energy storage device will broadcast its own operation status signal within a preset area and receive the operation status signals broadcast by other wind, solar and energy storage devices within the preset area. Step S120: Based on the preset weighting algorithm and the working status signals of each wind, solar and energy storage device, determine the master unit and slave unit of the wind, solar and energy storage device.

[0032] In this embodiment, each wind-solar-storage storage device 20 is equipped with a Mesh node to enable communication between them. When in operation, each device detects its own status using its own detection device and broadcasts its status signal within a preset area via the Mesh node. The preset area represents the communication range of the Mesh node. Each device broadcasts its status signal within the preset area and receives the status signals from other devices within the same area, comparing and confirming its own status with that of the others. Based on a preset weighting algorithm and its own status signals, each device determines its master and slave devices. The preset weighting algorithm requires various status information of the devices, which is contained within the status signals. It's important to note that the status signals also include each device's unique device ID. In this way, each wind, solar and energy storage device 20 can confirm its working status and thus determine whether it is the host or slave of the wind, solar and energy storage device.

[0033] refer to Figure 3 Optionally, the step of determining the master and slave units of the wind-solar-storage equipment based on a preset weighting algorithm and the working status signals of each wind-solar-storage equipment specifically includes: Step S121: Construct a preset weighting algorithm based on the preset remaining power coefficient, preset health level coefficient, and preset real-time power generation coefficient; Step S122: Based on the preset weighting algorithm and the remaining power signal, health status signal, and real-time power generation signal of each wind, solar and energy storage device, determine the main unit and slave unit of the wind, solar and energy storage device.

[0034] In this embodiment, the preset weighting algorithm requires the remaining power, health status, and real-time power generation of the wind, solar, and energy storage devices 20. A corresponding preset weighting algorithm is constructed by preset remaining power coefficients, preset health status coefficients, and preset real-time power generation coefficients. For example, the preset remaining power coefficient is 0.5, the preset health status coefficient is 0.3, and the preset real-time power generation coefficient is 0.2. Furthermore, the remaining power, health status, and real-time power generation of each wind, solar, and energy storage device 20 can be determined using the remaining power signal, health status signal, and real-time power generation signal of each device. These values ​​are then substituted into the preset weighting algorithm to obtain the status of each wind, solar, and energy storage device 20. The remaining power, health status, and real-time power generation of each wind, solar, and energy storage device 20 can be detected using corresponding detection devices. For example, the remaining power of the wind-solar-storage equipment 20 can be calculated by voltage detection, current detection, and coulomb counting; the health status of the wind-solar-storage equipment 20 can be detected by detecting the various devices inside the equipment, such as the energy storage device and the photovoltaic device. The health status of the energy storage device can be obtained by measuring its internal resistance, and the health status of the photovoltaic device can be obtained by detecting electroluminescence; the real-time power generation of the wind-solar-storage equipment 20 can be achieved by voltage detection and current detection.

[0035] refer to Figure 4 and Figure 8 , Figure 9 In one embodiment of the present invention, the step of the main unit of the wind-solar-storage equipment adjusting the output power of each wind-solar-storage equipment based on the rated power and remaining power of each equipment, as well as the total power required by the load, specifically includes: Step S310: The main unit of the wind, solar and energy storage equipment obtains its own rated power signal, remaining power signal and the rated power signal, remaining power signal and the total power required by the load of each wind, solar and energy storage equipment slave unit, so as to determine the rated power and remaining power of each wind, solar and energy storage equipment. Step S320: Based on the rated power and remaining power of each wind, solar and energy storage device, as well as the total power required by the load, broadcast the active power signal and reactive power signal corresponding to each wind, solar and energy storage device.

[0036] In this embodiment, the wind-solar-storage equipment host will obtain its own rated power signal and remaining power signal, as well as the rated power signals and remaining power signals of each wind-solar-storage equipment slave, through communication connections with each wind-solar-storage equipment slave, thereby determining its own rated power and remaining power, and the rated power and remaining power of each wind-solar-storage equipment slave. Furthermore, the wind-solar-storage equipment host will also obtain the total power required by the load. This total power required by the load can be obtained through a power supply switching device electrically connected to the output terminal of bus 10. When the load is electrically connected to the power supply switching device, the power supply switching device will communicate with the load to confirm the power required by the load. If the number of loads is not unique, the power supply switching device will obtain the power required by multiple loads, summarize them, and feed them back to the wind-solar-storage equipment host. It is understood that the power supply switching device also has Mesh nodes to achieve communication connections with each wind-solar-storage equipment 20. In this way, the wind-solar-storage main unit can obtain the rated power and remaining power of each wind-solar-storage device 20, as well as the total power required by the load. It then broadcasts the active and reactive power signals for each device 20, enabling the wind-solar-storage network system to output the corresponding power. Specifically, the allocation of active power primarily addresses the energy balance problem of the wind-solar-storage network system, and its calculation is highly dependent on the remaining power and rated power of the devices. The main unit will first dynamically calculate the interaction power between the network system and the load to determine whether the system is in a power deficit or power surplus scenario. After clarifying the total allocation requirements, the algorithm will dynamically adjust the regulation capacity of each device based on the remaining energy storage capacity. For example, in a discharge scenario, devices with higher remaining energy will be given a higher weight, thus undertaking more active power output; conversely, devices with lower remaining energy will have their output limited to extend storage life and prevent over-discharge. After considering the weight of remaining energy, the active power will be allocated according to the rated capacity ratio of each device. If the predicted output of photovoltaic and wind power exceeds the load demand, the excess active power will be allocated to partially charged energy storage devices for absorption; if the energy storage is full, it will be output to the grid or the output of new energy sources will be restricted. Reactive power allocation primarily addresses voltage support issues. Unlike active power allocation, reactive power allocation does not depend on the remaining battery capacity, but rather on the reactive power regulation capabilities and optimization objectives of each wind, solar, and energy storage device 20. The wind, solar, and energy storage network system will coordinate the reactive power output of each device based on the voltage requirements of the point of common coupling (PCC) using optimization algorithms. Common allocation strategies include: equal power factor allocation, equal margin allocation, capacity droop allocation, and optimal allocation. To calculate the specific reactive power output of each wind, solar, and energy storage device 20, the wind, solar, and energy storage network system will establish an objective function and apply optimization algorithms, such as the traditional interior-point method, genetic algorithms, and particle swarm optimization, to minimize system active power losses, minimize grid connection voltage fluctuations, or minimize overall operating costs.Since the capacity of photovoltaic inverters and energy storage PCS is limited, reactive power allocation must consider the current active power occupancy. When the wind, solar, and energy storage devices 20 generate more active power, their reactive power margin available for supporting voltage decreases. Therefore, the algorithm must ensure reactive power balance and minimize overall control costs while satisfying node voltage constraints. Each wind, solar, and energy storage device 20 undergoes a multi-dimensional optimization process to determine its own active and reactive power. Active power is dynamically weighted and allocated based on the total power required by the load, remaining power, and the rated capacity of each wind, solar, and energy storage device 20 to ensure energy supply and battery health. Reactive power is precisely calculated using voltage constraints, capacity margins, and optimization algorithms to ensure power quality and voltage stability of the grid. Both operate collaboratively within the apparent power limits of the inverters to maintain the balance of the wind, solar, and energy storage network system.

[0037] refer to Figure 5 and Figure 8 , Figure 9 In one embodiment of the present invention, the wind-solar-storage equipment networking system further includes a power supply switching device with multiple load connection terminals. After the step of the wind-solar-storage equipment host adjusting the output power of each wind-solar-storage equipment based on the rated power and remaining power of each wind-solar-storage equipment and the total power required by the load, the method further includes: Step S400: When the power supply switching equipment is electrically connected to the bus and multiple loads respectively, determine the power supply priority of the multiple loads; Step S500: If the total output power of each wind, solar and energy storage device is less than the total power required by multiple loads, disconnect the power supply path between the wind, solar and energy storage device networking system and the corresponding load based on the power supply priority of the load.

[0038] In this embodiment, the power switching device includes multiple load connection terminals and a bus 10 connection terminal, thereby realizing the electrical connection between the bus 10 and each load. The power switching device also includes corresponding switching components to enable and disable the connection between the multiple load connection terminals and the bus 10 connection terminal. When the power switching device is electrically connected to the bus 10 and multiple loads, it will perform a handshake communication with each load to determine their power requirements. Furthermore, during this handshake communication, the power switching device will also acquire the priority identifier of each load. For example, the loads may include communication equipment, medical equipment, and lighting equipment; medical equipment has a first-level priority, communication equipment a second-level priority, and lighting equipment a third-level priority. Therefore, if the total output power of all wind, solar, and energy storage devices 20 is less than the total power required by the multiple loads, the power switching device, upon receiving a control signal from the wind, solar, and energy storage device host, will disconnect the power supply path between the wind, solar, and energy storage network system and the corresponding load based on the load's power supply priority, thus ensuring that devices with higher power supply priority are given priority power supply.

[0039] refer to Figure 6 and Figure 8 , Figure 9 In one embodiment of the present invention, the wind-solar-storage equipment networking system further includes a power supply switching device with multiple load connection terminals. After the step of the wind-solar-storage equipment host adjusting the output power of each wind-solar-storage equipment based on the rated power and remaining power of each wind-solar-storage equipment and the total power required by the load, the method further includes: Step S600: When each wind, solar and energy storage device is in operation, each device will output a working detection signal when the interval reaches the preset time. Step S700: Determine the working status of each wind, solar and energy storage device based on the working detection signal; Step S800: If any wind, solar and energy storage device is in a fault state, control the faulty wind, solar and energy storage device to disconnect its electrical connection with the bus, and adjust the output power of each wind, solar and energy storage device that is not in a fault state.

[0040] In this embodiment, when each wind-solar-storage storage device 20 is in operation, each device will output a working detection signal when the interval reaches a preset duration. The preset detection duration can be set according to actual needs; for example, it can be set to 1 minute in cases of significant weather changes and 5 minutes in cases of minimal weather changes. The main unit of the wind-solar-storage storage device will determine the current working status of each device by receiving the working detection signals output from each slave device and its own working detection signal. It is understood that each wind-solar-storage storage device 20 is equipped with a corresponding detection device to detect various working statuses and output corresponding working detection signals through the Mesh nodes. If any wind, solar, or energy storage device 20 is in a fault state, the wind, solar, or energy storage device 20 will automatically disconnect its electrical connection with the bus 10, or the master unit of the wind, solar, or energy storage device will control the slave unit of the wind, solar, or energy storage device to disconnect its electrical connection with the bus 10, and adjust the output power of each wind, solar, or energy storage device 20 that is not in a fault state, so that the output power of the wind, solar, or energy storage device network system still meets the power demand of the load.

[0041] refer to Figure 7 Optionally, the step of controlling the faulty wind, solar, and energy storage devices to disconnect their electrical connection with the bus and adjusting the output power of the non-faulty wind, solar, and energy storage devices when any of them is in a faulty state specifically involves: Step S810: If the wind-solar-storage equipment in a faulty state is the main unit of the wind-solar-storage equipment, each wind-solar-storage equipment that is not in a faulty state will re-determine the main unit and slave unit of the wind-solar-storage equipment based on its own working status. Step S820: Control the wind, solar and energy storage equipment in a fault state to disconnect the electrical connection with the bus, and adjust the output power of each wind, solar and energy storage equipment that is not in a fault state.

[0042] In this embodiment, if the wind-solar-storage device 20 in a faulty state is the master unit, it is necessary to re-confirm the master and slave units to ensure the stable operation of the wind-solar-storage network system. The slave units not in a faulty state will rebroadcast their operating status signals, comparing their own operating status with that of the other wind-solar-storage devices 20, thereby confirming new master and slave units. Furthermore, the faulty wind-solar-storage device 20 will disconnect its electrical connection from the bus 10 to avoid interfering with the normal operation of the wind-solar-storage network system. In addition, the new master unit will regulate the output power of each non-faulty wind-solar-storage device 20 to ensure that the output power of the wind-solar-storage network system still meets the power demand of the load.

[0043] refer to Figure 8 and Figure 9 The present invention also proposes a wind-solar-storage equipment networking system, the wind-solar-storage equipment networking system comprising: Busbar 10; Multiple wind, solar and energy storage devices 20 are connected in parallel on the bus 10; the wind, solar and energy storage devices 20 are used to convert wind energy and solar energy into electrical energy and output it. The wind, solar and energy storage equipment 20 includes a control device, which includes a memory, a processor, and a control program for the wind, solar and energy storage equipment networking system stored in the memory and executable on the processor. The control program for the wind, solar and energy storage equipment networking system is configured to implement the steps of the control method for the wind, solar and energy storage equipment networking system as described above.

[0044] Optionally, the wind-solar-storage equipment networking system further includes a power supply switching device, which is electrically connected to the bus 10 and includes multiple load connection terminals for connecting loads; the power supply switching device is used to connect or disconnect the power supply path between the load and the bus 10.

[0045] It is worth noting that since the wind-solar-storage equipment networking system of the present invention is based on the wind-solar-storage equipment 20 described above, the embodiments of the wind-solar-storage equipment networking system of the present invention include all the technical solutions of all the embodiments of the wind-solar-storage equipment 20 described above, and the technical effects achieved are also completely the same, so they will not be repeated here.

[0046] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A control method for a wind-solar-storage equipment networking system, characterized in that, The wind-solar-storage equipment networking system includes a bus and multiple wind-solar-storage equipment connected in parallel on the bus. The control method of the wind-solar-storage equipment networking system includes: When the wind-solar-storage equipment networking system is in operation, the master and slave units of the wind-solar-storage equipment are determined based on the working status of multiple wind-solar-storage equipment. Each wind, solar and energy storage device slave unit acquires the amplitude, phase and frequency of the AC reference voltage output by the main unit of the wind, solar and energy storage device, and outputs an AC voltage with the same amplitude, phase and frequency as the AC reference voltage output by the main unit of the wind, solar and energy storage device based on the amplitude, phase and frequency of the AC reference voltage output by the main unit of the wind, solar and energy storage device. The main unit of the wind, solar and energy storage system adjusts the output power of each wind, solar and energy storage device based on the rated power and remaining power of each device, as well as the total power required by the load. The step of determining the main unit and slave unit of the wind, solar, and energy storage equipment based on the working status of multiple wind, solar, and energy storage devices specifically includes: When each wind, solar and energy storage device is in operation, each device will broadcast its own operating status signal within a preset area and receive the operating status signals broadcast by other wind, solar and energy storage devices within the preset area. Based on a preset weighting algorithm and the working status signals of each wind, solar and energy storage device, the master and slave devices of the wind, solar and energy storage devices are determined.

2. The control method for the wind-solar-storage equipment networking system as described in claim 1, characterized in that, The steps for determining the master and slave units of the wind-solar-storage equipment based on a preset weighting algorithm and the working status signals of each wind-solar-storage equipment specifically include: A preset weighting algorithm is constructed based on preset remaining power coefficient, preset health level coefficient, and preset real-time power generation coefficient; Based on a preset weighting algorithm and the remaining power signal, health status signal, and real-time power generation signal of each wind, solar, and energy storage device, the master and slave devices of the wind, solar, and energy storage devices are determined.

3. The control method for the wind-solar-storage equipment networking system as described in claim 1, characterized in that, The steps for the main unit of the wind-solar-storage equipment to adjust the output power of each wind-solar-storage device based on the rated power and remaining power of each device, as well as the total power required by the load, specifically include: The main unit of the wind, solar and energy storage equipment obtains its own rated power signal, remaining power signal, and the rated power signal, remaining power signal, and total power required by the load of each slave unit of the wind, solar and energy storage equipment, in order to determine the rated power and remaining power of each wind, solar and energy storage equipment. Based on the rated power and remaining power of each wind, solar and energy storage device, as well as the total power required by the load, the active power signal and reactive power signal of each wind, solar and energy storage device are broadcast.

4. The control method for the wind-solar-storage equipment networking system as described in claim 1, characterized in that, The wind-solar-storage equipment networking system also includes a power switching device with multiple load connection terminals. After the step of the wind-solar-storage equipment host adjusting the output power of each wind-solar-storage equipment based on the rated power and remaining power of each wind-solar-storage equipment and the total power required by the load, the method further includes: When the power supply switching equipment is electrically connected to the busbar and multiple loads respectively, determine the power supply priority of multiple loads; If the total output power of each wind, solar and energy storage device is less than the total power required by multiple loads, the power supply path between the wind, solar and energy storage device network system and the corresponding load is disconnected based on the power supply priority of the load.

5. The control method for the wind-solar-storage equipment networking system as described in claim 1, characterized in that, The wind-solar-storage equipment networking system also includes a power switching device with multiple load connection terminals. After the step of the wind-solar-storage equipment host adjusting the output power of each wind-solar-storage equipment based on the rated power and remaining power of each wind-solar-storage equipment and the total power required by the load, the method further includes: When each wind, solar and energy storage device is in operation, each device will output a working detection signal when the preset interval time is reached. Based on the working detection signals, the working status of each wind, solar and energy storage device is determined; If any wind, solar, or energy storage device is in a fault state, the device in the fault state is disconnected from the bus, and the output power of each wind, solar, or energy storage device that is not in a fault state is adjusted.

6. The control method for the wind-solar-storage equipment networking system as described in claim 5, characterized in that, The specific steps for controlling the faulty wind, solar, and energy storage devices to disconnect their electrical connection from the bus and adjusting the output power of the non-faulty wind, solar, and energy storage devices when any of them is in a faulty state are as follows: If the wind, solar and energy storage device in a faulty state is the main unit of the wind, solar and energy storage device, each wind, solar and energy storage device that is not in a faulty state will re-determine the main unit and slave unit of the wind, solar and energy storage device based on its own working status. The system controls the disconnection of the electrical connection between the wind, solar, and energy storage devices that are in a faulty state and the bus, and regulates the output power of each wind, solar, and energy storage device that is not in a faulty state.

7. A wind-solar-storage equipment networking system, characterized in that, The wind-solar-storage equipment networking system includes: busbar; Multiple wind, solar and energy storage devices are connected in parallel on the busbar; the wind, solar and energy storage devices are used to convert wind energy and solar energy into electrical energy and output it. The wind, solar, and energy storage equipment includes a control device, which includes a memory, a processor, and a control program for the wind, solar, and energy storage equipment networking system stored in the memory and executable on the processor. The control program for the wind, solar, and energy storage equipment networking system is configured to implement the steps of the control method for the wind, solar, and energy storage equipment networking system as described in any one of claims 1 to 6.

8. The wind-solar-storage equipment networking system as described in claim 7, characterized in that, The wind, solar and energy storage network system also includes a power supply switching device, which is electrically connected to the busbar and includes multiple load connection terminals for connecting loads; the power supply switching device is used to connect or disconnect the power supply path between the load and the busbar.

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