A wind storage networking control method in an off-grid environment, a storage medium and an electronic device

Abstract

The application discloses a wind storage networking control method in an off-grid environment, a storage medium and electronic equipment, relates to the field of wind turbine generator set grid connection control technology, and the method comprises the following steps: starting a target wind turbine generator; the target wind turbine generator is a wind turbine generator selected to be powered in the form of a voltage source; the rotation speed of each target wind turbine generator is monitored; after the rotation speed of each target wind turbine generator reaches a set rotation speed, the target wind turbine generator outputs a voltage to a power grid bus; the amplitude and frequency of the voltage of the power grid bus are monitored; after the amplitude and frequency of the voltage of the power grid bus reach the amplitude and frequency of the voltage of the power grid, the remaining wind turbine generators are controlled to operate in a grid-connected mode to complete power grid construction. According to the scheme, networking can be completed by using wind turbine generators, diesel power generation is not needed as a basis, and wind power generation is used as the main power source, so that diesel consumption can be reduced to the maximum extent, and the utilization efficiency of wind energy is improved.

Description

Technical Field

[0001] The present application relates to the technical field of wind power generation network control, and in particular to a wind storage network control method, storage medium and electronic equipment in an off-grid environment. Background Art

[0002] Wind power plays a crucial role in the current energy landscape, particularly in unique geographical locations such as islands and deserts. Existing technologies typically combine wind power generation with diesel generation, with diesel generating units providing a stable and reliable power grid and wind power generating units providing power output as grid-connected units.

[0003] In some remote areas with inconvenient transportation, diesel transportation is inconvenient, so diesel power plants have not been built or diesel power plants are prone to being unable to support the normal operation of the power grid due to insufficient diesel. In this case, although there is sufficient wind energy, it is difficult to convert and apply it, resulting in an unreasonable reduction in energy utilization efficiency. Summary of the Invention

[0004] The technical problem to be solved by this application is that the existing technology requires wind power generation to rely on diesel power generation, resulting in low wind energy utilization efficiency, and thus provides a wind storage network control method, storage medium and electronic equipment in an off-grid environment.

[0005] In a first aspect, the technical solution of the present application provides a method for controlling wind-storage network in an off-grid environment, comprising:

[0006] Controlling the target wind turbine to start; the target wind turbine is a wind turbine selected to be powered by a voltage source;

[0007] Monitor the speed of each target wind turbine generator, and after the speed of each target wind turbine generator reaches the set speed, control the output voltage of the target wind turbine generator to the grid bus;

[0008] The amplitude and frequency of the grid bus voltage are monitored. When the amplitude and frequency of the grid bus voltage reach the amplitude and frequency of the grid voltage, the remaining wind turbines are controlled to be connected to the grid to complete the grid formation.

[0009] Preferably, the wind-storage network control method in an off-grid environment described in some solutions is:

[0010] In the control of starting the target wind turbines: controlling different target wind turbines to start synchronously and maintain the same speed;

[0011] The control of the remaining wind turbines to connect to the grid to complete the grid formation is as follows: some or all of the remaining wind turbines are supplied with power by the grid in the form of current sources, and the torque of the target wind turbine as a voltage source is evenly distributed with the torque of the wind turbine as a current source.

[0012] Preferably, the wind-storage network control method in an off-grid environment described in some solutions further includes:

[0013] Get the power value of the energy storage battery pack;

[0014] Obtain the power demand of the power loads input into the power grid;

[0015] The wind turbine operating mode and / or the energy storage battery operating mode are adjusted according to the output power of all wind turbines, the power value of the energy storage battery group and the power demand of the power load.

[0016] Preferably, in some solutions, the wind-storage network control method in an off-grid environment, wherein the operation mode of the wind turbine generator and / or the operation mode of the energy storage battery group is adjusted according to the output power of all wind turbine generators, the power value of the energy storage battery group, and the power demand of the power load, includes:

[0017] If the output power of the wind turbine is greater than or equal to the power demand of the power load, the wind turbine is controlled to output the maximum power and to operate in the minimum pitch mode.

[0018] Preferably, in some solutions, the wind-storage network control method in an off-grid environment, wherein the operation mode of the wind turbine generator and / or the operation mode of the energy storage battery group is adjusted according to the output power of all wind turbine generators, the power value of the energy storage battery group, and the power demand of the power load, further includes:

[0019] If the power value of the energy storage battery group is less than the lower limit threshold, and the output power of all wind turbines is greater than the power demand of the power load;

[0020] The energy storage battery pack is charged according to the difference between the output power of all wind turbines and the power demand of the power load.

[0021] Preferably, in some solutions, the wind-storage network control method in an off-grid environment, wherein the operation mode of the wind turbine generator and / or the operation mode of the energy storage battery group is adjusted according to the output power of all wind turbine generators, the power value of the energy storage battery group, and the power demand of the power load, includes:

[0022] If the power output of all wind turbines is less than the power demand of the power load, and the power value of the energy storage battery group is greater than the upper limit threshold, then:

[0023] Determine whether the sum of the output power of the wind turbine and the power value of the energy storage battery pack is greater than the power demand of the power load:

[0024] If the judgment result is yes, controlling the energy storage battery pack to discharge and controlling the wind turbine generator and the energy storage battery pack to operate in a constant power mode;

[0025] If the judgment result is negative, the energy storage battery pack is controlled to discharge and part of the power load is controlled to be cut off.

[0026] Preferably, in the wind-storage network control method in an off-grid environment described in some solutions, during the startup of the target wind turbine:

[0027] If the power value of the energy storage battery pack is greater than the power required to start the target wind turbine, the energy storage battery pack is controlled to supply energy for starting the target wind turbine; otherwise, the auxiliary power supply is started to supply energy for starting the target wind turbine.

[0028] In a second aspect, the technical solution of the present application provides a wind-storage network control device in an off-grid environment, comprising:

[0029] A control module controls the start-up of a target wind turbine generator; the target wind turbine generator is a wind turbine generator selected to be powered by a voltage source;

[0030] A wind turbine monitoring module monitors the speed of each target wind turbine. After the speed of each target wind turbine reaches a set speed, the control module controls the output voltage of the target wind turbine to the grid bus.

[0031] The grid monitoring module monitors the amplitude and frequency of the grid bus voltage. When the amplitude and frequency of the grid bus voltage reach the amplitude and frequency of the grid voltage, the control module controls the remaining wind turbines to connect to the grid and complete the grid formation.

[0032] In a third aspect, the technical solution of the present application provides a computer-readable storage medium, in which program information is stored. After the computer reads the program information, it executes the steps of the wind-storage networking control method in an off-grid environment described in any one of the first aspects.

[0033] In a fourth aspect, the technical solution of the present application provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the wind-storage networking control method in an off-grid environment as described in any one of the first aspects.

[0034] Compared with the existing technology, the above technical solution provided by this application has the following technical effects:

[0035] The wind storage networking control method, storage medium and electronic equipment provided in the off-grid environment of the present application do not require diesel power generation and can complete the grid construction by only using wind power generation. In the method, the target wind turbine is controlled to start, and after the speed of each target generator reaches the set speed, the target wind turbine is controlled to output voltage to the grid bus. At this time, the target wind turbine acts as a voltage source to build the grid. After the amplitude and frequency of the grid bus voltage reach the amplitude and frequency of the grid voltage, the remaining wind turbines are controlled to be connected to the grid to complete the grid construction. The above scheme of the present application can complete the networking through wind turbines, without the need for diesel power generation as a basis. With wind power generation as the main source of electricity, it can minimize diesel consumption and improve the utilization efficiency of wind energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the network structure targeted by the wind-storage network control method in an off-grid environment described in this application;

[0037] Figure 2 This is a flow chart of a wind-storage network control method in an off-grid environment according to an embodiment of the present application;

[0038] Figure 3 This is a flow chart of a wind-storage network control method in an off-grid environment according to another embodiment of the present application;

[0039] Figure 4 A logical diagram of the operation mode adjustment of a wind turbine generator set, an energy storage battery group, and an electrical load after wind-storage networking in an off-grid environment according to one embodiment of the present application;

[0040] Figure 5 This is a structural block diagram of a wind-storage networking control device in an off-grid environment according to an embodiment of the present application;

[0041] Figure 6 This is a schematic diagram of the hardware connection relationship of the electronic device that executes the wind-storage networking control method in an off-grid environment described in one embodiment of the present application. DETAILED DESCRIPTION

[0042] The specific implementation of this application is further described below with reference to the accompanying drawings.

[0043] It is easy to understand that according to the technical solution of this application, a variety of structural methods and implementation methods can be replaced with each other by those skilled in the art without changing the essential spirit of this application. Therefore, the following specific embodiments and drawings are only exemplary descriptions of the technical solution of this application and should not be regarded as the entire application or as a limitation or restriction of the technical solution of the application.

[0044] The wind-storage network control method in the off-grid environment of this application can be applied to Figure 1In the control system of the network architecture shown in the figure. Figure 1 As shown in , a wind turbine generator set may include multiple wind turbines, each of which may be a large-megawatt wind turbine generator set such as a permanent magnet synchronous generator set. A full-power converter is configured in the wind turbine generator set, and the full-power converter is in the form of multiple converters connected in parallel. Among them, at least one converter serves as a grid-building converter, which is used to achieve the task of building the voltage and frequency required for the entire power system in an off-grid environment. The corresponding wind turbine generator is the target wind turbine described in this application; the remaining converters serve as grid-following converters, and the corresponding wind turbine generators are the remaining wind turbines described in this application, which can implement torque control and output power to the load in the form of a current source. The control system described in the figure can control the wind turbine and the full-power converter, so that the wind turbine generator set outputs voltage as a voltage source or outputs power as a current source. Figure 1 The energy storage battery group shown in the figure can also include two groups. One group can be used as a voltage source to form a power grid together with the wind turbine generator set, and the other group can be used as a current source to run with the grid after the grid is completed. In addition, Figure 1 As shown in , the grid can be either a DC grid or an AC grid. In some preferred embodiments, a DC grid is formed, in which case the AC output of the wind turbine is converted to DC via a rectifier. Since the energy storage battery pack can support DC power, if the wind turbine also outputs DC power, it will be more convenient to control the two when networking, especially without having to consider whether the voltage phase is aligned, so that they can be directly connected to the grid. Furthermore, the following scheme of this application is based on the premise that the area where the wind turbine is located has sufficient wind energy, that is, when executing the following method, the wind speed meets the operating requirements of the wind turbine.

[0045] This embodiment provides a wind-storage network control method in an off-grid environment. Figure 2 Shown, including:

[0046] S100: Controlling a target wind turbine to start; the target wind turbine is a wind turbine selected to be powered by a voltage source.

[0047] A wind turbine generator set includes multiple wind turbines. In order to meet the regular electricity demand required for building a power grid, one or some of the wind turbines can be selected and started.

[0048] S200: monitoring the rotational speed of each target wind turbine, and after the rotational speed of each target wind turbine reaches a set rotational speed, controlling the output voltage of the target wind turbine to the grid bus.

[0049] Sensors installed in the wind turbine monitor blade rotation. The set speed is the minimum speed required to establish a power grid. There's a known relationship between speed and output voltage. Grid voltage is typically industrial voltage with a specified amplitude and frequency. The wind turbine's speed, determined by the known voltage amplitude and frequency, is the set speed. When the target wind turbine speed meets the grid's requirements, it operates normally.

[0050] S300: monitoring the amplitude and frequency of the grid bus voltage. When the amplitude and frequency of the grid bus voltage reach the amplitude and frequency of the grid voltage, controlling the remaining wind turbines to be connected to the grid to complete the grid formation.

[0051] If the amplitude and frequency of the grid bus voltage deviate from the amplitude and frequency of the grid voltage, step S200 must still be executed to ensure that the final grid bus voltage amplitude and frequency reach the amplitude and frequency of the grid voltage, which is typically the industrial power voltage specified in national standards. The remaining wind turbines are then connected to the grid and put into operation. The remaining wind turbines can be connected to the grid either as voltage sources or as current sources. Once the grid stabilizes, the electrical load can be put into operation.

[0052] In the above scheme, if all wind turbines are used as voltage sources in the grid and they output AC power, the voltages output by these wind turbines must maintain consistency in amplitude, frequency, and phase to meet grid connection requirements. If the wind turbines output DC power, however, these DC sources can be connected to the grid using a DC networking device equipped with switching elements.

[0053] The above-mentioned solution of this embodiment eliminates the need for diesel generators and utilizes only wind power generation to complete grid construction. In this method, the target wind turbines are controlled to start up. After the speed of each target generator reaches a set speed, the target wind turbines are controlled to output voltage to the grid bus. At this point, the target wind turbines serve as voltage sources to construct the grid. After the amplitude and frequency of the grid bus voltage reach the amplitude and frequency of the grid voltage, the remaining wind turbines are controlled to connect to the grid to complete grid construction. The above-mentioned solution of this application can complete grid construction using wind turbines, eliminating the need for diesel generators as a foundation. By using wind power generation as the primary source of electricity, it can minimize diesel consumption and improve wind energy utilization efficiency.

[0054] Preferably, in step S100, when controlling the start-up of the target wind turbines, different target wind turbines are controlled to start synchronously and maintain the same rotational speed. In step S300, when controlling the remaining wind turbines to connect to the grid and complete the grid formation, some or all of the remaining wind turbines are supplied with power from the grid in the form of current sources, and the torque of the target wind turbines serving as voltage sources is evenly distributed with the torque of the wind turbines serving as current sources. When starting the grid, each wind turbine rotates synchronously and maintains a consistent rotational speed, achieving a unified control logic and simplifying the control algorithm. After the grid formation is completed, each wind turbine in the wind turbine generator set is regulated to evenly distribute the torque of the two types of wind turbines. For example, the torque of the two types of wind turbines can be maintained at a predetermined ratio, which is considered to be an even torque distribution, thereby achieving efficient load balancing control.

[0055] More preferably, Figure 3 As shown, the method further includes:

[0056] S400: Acquire the power value of the energy storage battery pack.

[0057] The energy storage battery pack itself is equipped with a power monitoring component that can determine the power value of the energy storage battery pack in real time and send it to the control system.

[0058] S500: Obtaining the power demand of the power load connected to the power grid.

[0059] The power load is gradually increased when it is put into use, that is, the power load may change. During the process of putting the load into use, the control system determines the power demand of all the loads in real time.

[0060] S600: Adjusting the wind turbine operating mode and / or the energy storage battery operating mode according to the output power of all wind turbines, the power value of the energy storage battery group and the power demand of the power load.

[0061] By adjusting the operating modes of the wind turbine and the energy storage battery pack, it is possible to achieve a mode where the wind turbine can independently power the load or the wind turbine and the energy storage battery pack can jointly power the load. By coordinating the output of the wind turbine and the energy storage battery pack, the output can be continuously supplied to as many loads as possible, maintaining the stable and continuous operation of the power grid.

[0062] Further, if Figure 4As shown in FIG, S600 adjusts the wind turbine operating mode and / or the energy storage battery operating mode according to the output power of all wind turbines, the power value of the energy storage battery group, and the power demand of the power load, including determining whether the output power of the wind turbine is greater than or equal to the power demand of the power load. If the determination result is yes, step S601 is executed, and if the determination result is no, step S605 is executed. As shown in the figure:

[0063] S601: Controlling the wind turbine to operate in a single-machine maximum power mode;

[0064] S602: Control the wind turbine to operate in a minimum pitch angle mode.

[0065] That is, if the output power of the wind turbine is greater than or equal to the power demand of the power load, the wind turbine will operate in the single-machine maximum power and minimum pitch mode. At this time, the wind turbine is fully capable of supplying power to all power loads.

[0066] Furthermore, after step S602, the following steps are included:

[0067] S603: Determine whether the power level of the energy storage battery pack is less than a lower threshold, which is used to determine whether the energy storage battery pack needs to be charged. If the judgment result is yes, step S604 is executed. If the judgment result is no, the process returns to the step of determining whether the output power of the wind turbine generator is greater than or equal to the power demand of the power load.

[0068] S604: charging the energy storage battery pack according to the difference between the output power of all wind turbines and the power demand of the power load.

[0069] That is, if the wind turbine generator set still has surplus power supply capacity after providing electric energy to all electrical loads, and the energy storage battery group needs to be charged at this time, the surplus power supply capacity is used to charge the energy storage battery group.

[0070] S605: Determine whether the battery pack's charge level is greater than an upper threshold. This upper threshold is used to determine whether the battery pack has sufficient charge to provide power, i.e., whether it can provide power to the grid. If so, proceed to step S606; otherwise, proceed to step S609.

[0071] S606: Determine whether the sum of the output power of the wind turbine and the power value of the energy storage battery group is greater than the power demand of the power load. If the judgment result is yes, execute step S607; if the judgment result is no, execute step S608.

[0072] S607: Control the energy storage battery pack to discharge and control the wind turbine generator and the energy storage battery pack to operate in a constant power mode.

[0073] At this time, the power of the wind turbine is not enough to support all power loads, but the energy storage battery pack has the power supply capacity, and the sum of the power of the two can support all power loads, so the two together provide power for the power loads.

[0074] S608: Control the energy storage battery pack to discharge and control the cutting off of part of the power load.

[0075] At this time, the power of the wind turbine is not enough to support all power loads, and the energy storage battery pack has the power supply capacity, but the sum of the power of the two still cannot support all power loads. In this case, the power loads with high priority are retained, and the power loads with low priority are cut off from the current power grid.

[0076] S609: Control to cut off part of the power load.

[0077] At this time, the wind turbine generator set cannot support all the loads. Although the energy storage battery itself has some power value, it is not enough to discharge as a power source, so some low-priority power loads are directly cut off.

[0078] The above-mentioned solution of this application coordinates and controls the output power of the wind turbine, the power level of the energy storage battery pack, and the power demand of the power load, giving priority to wind power generation for energy supply. When wind power generation is insufficient, the energy storage battery pack provides auxiliary energy. If the wind turbine can ensure the normal operation of the power load and still has excess power supply capacity, it will be stored in the energy storage battery pack for backup. Through power load transfer control, this solution can quickly and dynamically adjust the state of the network system, maintain continuous system operation, and provide power to as many power loads as possible.

[0079] Further preferably, in the above solution, in step S100, when controlling the start-up of the target wind turbine, if the power level of the energy storage battery pack is greater than the power required for starting the target wind turbine, the energy storage battery pack is controlled to supply power for starting the target wind turbine; otherwise, an auxiliary power supply is activated to supply power for starting the target wind turbine. The auxiliary power supply may be a backup battery or generator capable of providing a small amount of power.

[0080] The embodiment of the present application also provides a wind-storage network control device in an off-grid environment, such as Figure 5 As shown, it includes:

[0081] The control module 51 controls the target wind turbine to start; the target wind turbine is a wind turbine selected to be powered by a voltage source.

[0082] The wind turbine monitoring module 52 monitors the rotation speed of each target wind turbine. After the rotation speed of each target wind turbine reaches a set rotation speed, the control module controls the target wind turbine to output voltage to the grid bus.

[0083] The grid monitoring module 53 monitors the amplitude and frequency of the grid bus voltage. When the amplitude and frequency of the grid bus voltage reach the amplitude and frequency of the grid voltage, the control module controls the remaining wind turbines to be connected to the grid to complete the grid formation.

[0084] The device provided in the above embodiment performs wind-storage networking control and can complete the networking through wind turbines without diesel power generation as a basis. Wind power generation is used as the main source of electricity, which can minimize diesel consumption and improve the utilization efficiency of wind energy.

[0085] Preferably, the control module 51 is also used to control the synchronous startup of different target wind turbines and maintain the same rotational speed; and to control some or all of the remaining wind turbines to be powered by the grid as current sources, so that the torque of the target wind turbines acting as voltage sources is evenly distributed with the torque of the wind turbines acting as current sources. Through the device of this solution, when the control module 51 starts to form a network, it controls the synchronous rotation of each target wind turbine and maintains a consistent rotational speed, thereby achieving unified control logic and simplifying the control algorithm. After the network is formed, the control module 51 regulates each wind turbine to evenly distribute the torque of the two types of wind turbines, thereby achieving efficient load balancing control.

[0086] Further preferably, the device also includes an energy storage monitoring module to obtain the power value of the energy storage battery pack; the power grid monitoring module 53 obtains the power demand of the power loads input into the power grid; the control module 51 adjusts the wind turbine operating mode and / or the energy storage battery pack operating mode according to the output power of all wind turbines, the power value of the energy storage battery pack and the power demand of the power loads. By adjusting the wind turbine operating mode and the energy storage battery pack operating mode, it is possible to achieve a mode in which the wind turbine independently supplies power to the power loads or the wind turbine and the energy storage battery pack jointly supply power to the power loads. In this device, the control module 51 coordinates the output of the wind turbine and the energy storage battery pack to continuously supply power to as many power loads as possible, thereby maintaining stable and continuous operation of the power grid.

[0087] Preferably, when the output power of the wind turbine is greater than or equal to the power demand of the power load, the control module 51 controls the wind turbine to output the maximum power of the single unit and controls the wind turbine to operate in the minimum pitch angle mode; when the power value of the energy storage battery pack is less than the lower limit threshold and the output power of all wind turbines is greater than the power demand of the power load, the energy storage battery pack is charged according to the difference between the output power of all wind turbines and the power demand of the power load; when the output power of all wind turbines is less than the power demand of the power load and the power value of the energy storage battery pack is greater than the upper limit threshold, it is determined whether the sum of the output power of the wind turbine and the power value of the energy storage battery pack is greater than the power demand of the power load; if the judgment result is yes, the energy storage battery pack is controlled to discharge and the wind turbine and the energy storage battery pack are controlled to operate in the constant power mode; if the judgment result is not, the energy storage battery pack is controlled to discharge and part of the power load is controlled to be cut off. In the above scheme, the control module 51 coordinates and controls the output power of the wind turbine, the power level of the energy storage battery, and the power demand of the load. It prioritizes wind power generation and uses the energy storage battery as an auxiliary power source when wind power is insufficient. If the wind turbine can ensure normal operation of the load and still have excess power capacity, this capacity is stored in the energy storage battery for backup. By controlling the power load transfer, the network system status can be quickly and dynamically adjusted.

[0088] Furthermore, when the power level of the energy storage battery pack exceeds the power required to start the target wind turbine, the control module 51 controls the energy storage battery pack to supply energy for starting the target wind turbine; otherwise, the control module 51 activates the auxiliary power supply to supply energy for starting the target wind turbine, thereby ensuring that the wind turbine starts normally and establishes a power grid.

[0089] An embodiment of the present application further provides a computer-readable storage medium, wherein program information is stored in the storage medium. After a computer reads the program information, the computer executes the steps of the wind-storage networking control method in an off-grid environment according to any one of the above schemes.

[0090] An embodiment of the present application also provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements the steps of the wind-storage networking control method in an off-grid environment as described in any one of the above solutions.

[0091] The present application also provides an electronic device, such as Figure 6As shown, the electronic device includes at least one processor 61 and at least one memory 62. At least one memory 62 stores program information. After reading the program information, the at least one processor 61 executes the off-grid wind-storage network control method described in any of the above method embodiments. The device may also include an input device 63 and an output device 64. The processor 61, memory 62, input device 63, and output device 64 are communicatively connected. Memory 62, as a non-volatile computer-readable storage medium, can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules. By running the non-volatile software programs, instructions, and modules stored in memory 62, the processor 61 executes various functional applications and processes data, thereby implementing the off-grid wind-storage network control method provided in any of the above methods. Memory 62 may include a program storage area and a data storage area. The program storage area may store an operating system and at least one application required for a function; the data storage area may store data generated by the off-grid wind-storage network control method. In addition, the memory 62 may include a high-speed random access memory and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory 62 may optionally include a memory remotely located relative to the processor 61, and these remote memories may be connected to a device for executing the wind-storage networking control method in an off-grid environment via a network. Examples of the above-mentioned network include but are not limited to the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof. The input device 63 may receive input user clicks and generate signal inputs related to user settings and function controls of the wind-storage networking control method in an off-grid environment. The output device 64 may include a display device such as a display screen. When the one or more modules are stored in the memory 62 and are executed by the one or more processors 61, the wind-storage networking control method in an off-grid environment in any of the above-mentioned method embodiments is executed.

[0092] As needed, the above technical solutions can be combined to achieve the best technical effect.

[0093] The above are only the principles and preferred embodiments of the present application. It should be noted that, for those skilled in the art, on the basis of the principles of the present application, several other modifications can be made, which should also be considered as the scope of protection of the present application.

Claims

1. A wind-storage network control method in an off-grid environment, characterized in that: include: Control the target wind turbine to start; The target wind turbine is a wind turbine selected to be powered by a voltage source; a full-power converter is configured in the wind turbine, and the full-power converter includes multiple converters connected in parallel; at least one converter serves as a grid-connecting converter, configured to achieve the voltage and frequency required for establishing an entire power system in an off-grid environment, and the corresponding wind turbine is the target wind turbine; Monitor the speed of each target wind turbine generator, and after the speed of each target wind turbine generator reaches the set speed, control the output voltage of the target wind turbine generator to the grid bus; monitoring the amplitude and frequency of the grid bus voltage, and controlling the remaining wind turbines to connect to the grid and operate to complete the grid formation after the amplitude and frequency of the grid bus voltage reach the amplitude and frequency of the grid voltage; the wind turbines output direct current (DC) power, and the grid is a DC grid; In the control of starting the target wind turbines: controlling different target wind turbines to start synchronously and maintain the same speed; The control of the remaining wind turbines for grid-connected operation to complete the grid formation is as follows: some or all of the remaining wind turbines are supplied with power from the grid in the form of current sources, and the torque of the target wind turbine as a voltage source is evenly distributed with the torque of the wind turbine as a current source; the remaining converters in the full-power converter serve as grid-connected converters for implementing torque control and outputting power to the load in the form of current sources, and the corresponding wind turbines are the remaining wind turbines.

2. The off-grid wind-storage network control method according to claim 1 is characterized in that: Also includes: Get the power value of the energy storage battery pack; Obtain the power demand of the power loads input into the power grid; The wind turbine operating mode and / or the energy storage battery operating mode are adjusted according to the output power of all wind turbines, the power value of the energy storage battery group and the power demand of the power load.

3. The off-grid wind-storage network control method according to claim 2 is characterized in that: The adjusting the wind turbine operating mode and / or the energy storage battery operating mode according to the output power of all wind turbines, the power value of the energy storage battery group and the power demand of the power load includes: If the output power of all the wind turbines is greater than or equal to the power demand of the power load, the wind turbines are controlled to output maximum power and to operate in a minimum pitch mode.

4. The off-grid wind-storage network control method according to claim 3 is characterized in that: The adjusting the wind turbine operating mode and / or the energy storage battery operating mode according to the output power of all wind turbines, the power value of the energy storage battery group and the power demand of the power load further includes: If the power value of the energy storage battery group is less than the lower limit threshold, and the output power of all the wind turbines is greater than the power demand of the power load; The energy storage battery pack is charged according to the difference between the output power of all the wind turbines and the power demand of the power load.

5. The off-grid wind-storage network control method according to claim 2, characterized in that: The adjusting the wind turbine operating mode and / or the energy storage battery operating mode according to the output power of all wind turbines, the power value of the energy storage battery group and the power demand of the power load includes: If the power output of all wind turbines is less than the power demand of the power load, and the power value of the energy storage battery group is greater than the upper limit threshold, then: Determine whether the sum of the output power of all wind turbines and the power value of the energy storage battery group is greater than the power demand of the power load: If the judgment result is yes, controlling the energy storage battery pack to discharge and controlling all the wind turbines and the energy storage battery pack to operate in a constant power mode; If the judgment result is negative, the energy storage battery pack is controlled to discharge and part of the power load is controlled to be cut off.

6. The off-grid wind-storage network control method according to claim 5 is characterized in that: The target wind turbine generator is being started: If the power value of the energy storage battery pack is greater than the power required to start the target wind turbine, the energy storage battery pack is controlled to supply energy for starting the target wind turbine; otherwise, the auxiliary power supply is started to supply energy for starting the target wind turbine.

7. A wind-storage network control device in an off-grid environment, characterized in that: include: A control module controls the start-up of a target wind turbine; The target wind turbine is a wind turbine selected to be powered by a voltage source; a full-power converter is configured in the wind turbine, and the full-power converter includes multiple converters connected in parallel; at least one converter serves as a grid-connecting converter, configured to achieve the voltage and frequency required for establishing an entire power system in an off-grid environment, and the corresponding wind turbine is the target wind turbine; A wind turbine monitoring module monitors the speed of each target wind turbine. After the speed of each target wind turbine reaches a set speed, the control module controls the output voltage of the target wind turbine to the grid bus. A power grid monitoring module monitors the amplitude and frequency of the power grid bus voltage. When the amplitude and frequency of the power grid bus voltage reach the amplitude and frequency of the power grid voltage, the control module controls the remaining wind turbines to connect to the grid to complete the power grid formation. The wind turbines output direct current (DC) power, and the power grid is a DC power grid. The control module is also used to control different target wind turbines to start synchronously and maintain the same speed; some or all of the remaining wind turbines are powered by the grid in the form of current sources, and the torque of the target wind turbine as a voltage source is evenly distributed with the torque of the wind turbine as a current source; the remaining converters in the full-power converter serve as grid-following converters, which are used to implement torque control and output power to the load in the form of current sources, and the corresponding wind turbines are the remaining wind turbines.

8. A computer-readable storage medium, characterized in that The storage medium stores program information, and after the computer reads the program information, it executes the steps of the wind-storage networking control method in an off-grid environment according to any one of claims 1 to 6.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory, characterized in that: The processor executes the computer program to implement the steps of the wind-storage networking control method in an off-grid environment according to any one of claims 1 to 6.

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