A method for starting grid-connection of a phase modifier system and related device

Abstract

The application discloses a method and device for starting and grid-connection of a phase modifier system, a starting and grid-connection equipment and a computer readable storage medium. The method comprises the following steps: a control module of the phase modifier receives a starting instruction; the phase modifier is excited and started according to a first starting target value; the first starting target value is half of an initial starting target value; when the rotor speed of the phase modifier is greater than or equal to a first preset speed, the excitation system exits operation; when the rotor speed of the phase modifier is less than a second preset speed, the phase modifier is excited and started according to the initial starting target value; the first preset speed is greater than the second preset speed; and when the excitation and starting process corresponding to the initial starting target value is completed, grid-connection processing is performed. The method avoids the occurrence of residual magnetism in the starting process of the phase modifier, and improves the success rate and stability of starting and grid-connection.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of power equipment, and more particularly to a starting and grid-connection method of a phase modifier system, a starting and grid-connection device of a phase modifier system, a starting and grid-connection equipment, and a computer readable storage medium. BACKGROUND

[0002] In a power system, a phase modifier serves as a dynamic reactive power compensation device and is of great significance to the stable operation of the power grid. However, the DC bias magnetization or excessive residual magnetism may occur in the phase modifier booster during operation, which will result in a large excitation current at the machine terminal when the phase modifier is started, thereby affecting the normal start of the phase modifier and possibly causing damage to the equipment. In addition, excessive residual magnetism will also seriously hinder the normal grid-connection of the unit, bringing potential risks to the safe and stable operation of the power system.

[0003] In the related art, when the phase modifier booster has DC bias magnetization or excessive residual magnetism, it will adversely affect the normal operation of the power system. During the starting of the phase modifier, excessive residual magnetism will result in a large excitation current at the machine terminal, which may cause equipment failure and increase maintenance costs. At the same time, excessive residual magnetism will also make it difficult for the unit to be grid-connected, affecting the stability and reliability of the power system.

[0004] Therefore, how to avoid the occurrence of residual magnetism during the starting of the phase modifier and improve the success rate of starting and grid-connection is an important issue for those skilled in the art. SUMMARY

[0005] The purpose of the present application is to provide a starting and grid-connection method of a phase modifier system, a starting and grid-connection device of a phase modifier system, a starting and grid-connection equipment, and a computer readable storage medium, which avoids the occurrence of residual magnetism during the starting of the phase modifier and improves the success rate and stability of starting and grid-connection.

[0006] In view of the above defects or improvement needs of the prior art, the present application provides a starting and grid-connection method of a phase modifier system, comprising:

[0007] The control module of the phase modifier receives a starting instruction;

[0008] The phase modifier is excited and started according to a first excitation target value; wherein the first excitation target value is half of an initial excitation target value;

[0009] When the rotor speed of the phase modifier is greater than or equal to a first preset speed, the excitation system exits operation;

[0010] When the rotor speed of the phase modifier is less than a second preset speed, the phase modifier is excited and started according to the initial excitation target value; wherein the first preset speed is greater than the second preset speed.

[0011] When the excitation starting process corresponding to the initial excitation target value is completed, a grid connection process is performed.

[0012] Optionally, when the rotor speed of the phase modifier is greater than or equal to a first preset speed, the excitation system exits operation after the excitation system exits operation.

[0013] When the rotor speed of the phase modifier is less than the second preset speed, the phase modifier is excited and started according to a second excitation target value; wherein the first excitation target value is less than the second excitation target value, and the second excitation target value is less than the initial excitation target value.

[0014] When the rotor speed of the phase modifier is greater than or equal to the first preset speed, the excitation system exits operation.

[0015] When the rotor speed of the phase modifier is less than the second preset speed, the step of performing the excitation starting process corresponding to the initial excitation target value is executed.

[0016] Optionally, the control module of the phase modifier receives a start instruction, which includes:

[0017] The control module receives the start instruction from an operation interface of the phase modifier.

[0018] Optionally, the second excitation target value is 75% of the initial excitation target value.

[0019] Optionally, the first preset speed is 3150 revolutions, and the second preset speed is 2900 revolutions.

[0020] The application also provides a start and grid connection device of a phase modifier system, which includes:

[0021] An instruction receiving module is configured to receive a start instruction.

[0022] A first excitation starting module is configured to excite and start the phase modifier according to a first excitation target value; wherein the first excitation target value is half of an initial excitation target value.

[0023] A first stopping module is configured to control the excitation system to exit operation when the rotor speed of the phase modifier is greater than or equal to a first preset speed.

[0024] A target excitation starting module is configured to excite and start the phase modifier according to the initial excitation target value when the rotor speed of the phase modifier is less than a second preset speed; wherein the first preset speed is greater than the second preset speed.

[0025] A grid connection process module is configured to perform a grid connection process when the excitation starting process corresponding to the initial excitation target value is completed.

[0026] Optionally, further comprising:

[0027] a second excitation starting module, configured to perform excitation starting processing on the phase modifier according to a second excitation target value when the rotor speed of the phase modifier is less than the second preset speed; wherein the first excitation target value is less than the second excitation target value which is less than the initial excitation target value;

[0028] a second stopping module, configured to control the excitation system to exit operation when the rotor speed of the phase modifier is greater than or equal to the first preset speed;

[0029] Optionally, the instruction receiving module is specifically configured to receive the starting instruction from an operation interface of the phase modifier.

[0030] The application further provides a starting and grid-connection device, comprising:

[0031] a memory, configured to store a computer program;

[0032] a processor, configured to execute the computer program to realize the steps of the starting and grid-connection method.

[0033] The application further provides a computer readable storage medium, wherein the computer readable storage medium stores a computer program, and the computer program is executed by a processor to realize the steps of the starting and grid-connection method.

[0034] The application provides a starting and grid-connection method of a phase modifier system, comprising: a control module of a phase modifier receives a starting instruction; excitation starting processing is performed on the phase modifier according to a first excitation target value; wherein the first excitation target value is half of an initial excitation target value; when the rotor speed of the phase modifier is greater than or equal to a first preset speed, an excitation system exits operation; when the rotor speed of the phase modifier is less than a second preset speed, excitation starting processing is performed on the phase modifier according to the initial excitation target value; wherein the first preset speed is greater than the second preset speed; when the excitation starting processing corresponding to the initial excitation target value is completed, grid-connection processing is performed.

[0035] The application has the following beneficial effects:

[0036] By adopting the half-press excitation starting processing mode, the residual magnetism of the phase modifier boost transformer can be effectively eliminated, and the success rate of grid-connected starting is improved. In the starting process, the excitation starting processing is first performed according to the first starting target value, the initial excitation inrush current is reduced, the impact on the equipment is reduced, and the increase of residual magnetism caused by excessive excitation current is avoided. When the rotor speed of the phase modifier is greater than or equal to the first preset speed, the excitation system exits the operation, which is helpful for eliminating the residual magnetism. When the rotor speed of the phase modifier is less than the second preset speed, the excitation starting processing is performed again according to the initial starting target value, and the grid-connected processing is realized. Through the synergistic effect of these steps, the residual magnetism can be effectively eliminated, the residual magnetism in the machine starting process of the phase modifier is avoided, and the success rate and stability of the grid-connected starting are greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of the provided drawings.

[0038] Figure 1 A flow chart of a starting and grid-connected method of a phase modifier system provided by an embodiment of the present application;

[0039] Figure 2 A structural schematic diagram of a starting and grid-connected device of a phase modifier system provided by an embodiment of the present application;

[0040] Figure 3 A structural schematic diagram of a starting and grid-connected device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0041] The core of the present application is to provide a starting and grid-connected method of a phase modifier system, a starting and grid-connected device of a phase modifier system, a starting and grid-connected device, and a computer readable storage medium. The method avoids the occurrence of residual magnetism in the machine starting process of the phase modifier, and improves the success rate and stability of starting and grid-connected.

[0042] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as there is no conflict.

[0043] The starting and grid-connected method of a phase modifier system provided by the present application will be described below through an embodiment.

[0044] Please refer to Figure 1 , Figure 1 A flowchart of a method for starting and grid-connection of a phase modifier system provided by an embodiment of the present application.

[0045] The embodiment can include:

[0046] S101, the control module of the phase modifier receives a starting instruction;

[0047] In this step, the starting of the phase modifier needs to trigger the whole starting process by receiving the starting instruction through the control module. The control module receives the starting instruction from the operation interface of the phase modifier, and the operator issues the starting instruction on the operation interface. The control module receives and responds to this instruction. A triggering mechanism is provided for the starting of the phase modifier, ensuring the orderly progress of the starting process.

[0048] Further, this step can include: the control module receives the starting instruction from the operation interface of the phase modifier.

[0049] S102, excitation starting processing is performed on the phase modifier according to a first excitation target value; wherein the first excitation target value is half of an initial excitation target value;

[0050] On the basis of S101, in the initial stage of starting, this step uses a lower first excitation target value for excitation starting processing, which helps to reduce the excitation inrush current and avoid damage to the equipment caused by excessive excitation current.

[0051] For example, if the initial excitation target value is 20kV, then the first excitation target value is 10kV. By modifying the relevant parameters of the excitation regulator, the excitation target value is set to half of the initial excitation target value, so as to realize excitation starting with a lower voltage. The excitation inrush current in the initial stage of starting is reduced, the impact on the equipment is reduced, and the safe operation of the equipment is protected.

[0052] Among them, the phase modifier half-voltage excitation demagnetization is to use the principle of alternating current demagnetization, by inputting alternating voltage with continuously changing and decreasing amplitude at the low-voltage side of the booster transformer, to drive the internal residual magnetism of the booster transformer core to gradually reduce the hysteresis loop area.

[0053] S103, when the rotor speed of the phase modifier is greater than or equal to a first preset speed, the excitation system exits operation;

[0054] On the basis of S102, when the rotor speed reaches a certain degree, the excitation system exits operation;

[0055] During the operation of the phase modifier, the rotor speed is monitored in real time. When the rotor speed is greater than or equal to a first preset speed (for example, 3150 revolutions), the control module issues an instruction to stop the excitation system from working, instead of actually performing grid-connection processing. Reasonable control of the operation time of the excitation system improves energy utilization efficiency and reduces the complexity of the system.

[0056] That is, when the rotor speed of the phase modifier reaches 3150 revolutions, the excitation system exits operation and the step-up transformer is not connected to the grid, and the phase modifier system designed as self-excitation becomes an energy isolated system and no longer receives external energy input. At this time, an alternating current always appears on the terminal winding of the step-up transformer, which causes the entire magnetic field of the step-up transformer winding to change along the hysteresis loop. Due to the energy isolated system, the terminal current also decays, which is equivalent to the gradually decreasing demagnetizing current in the AC demagnetization method, and drives the internal residual magnetism of the step-up transformer core to gradually reduce the area of the hysteresis loop. The phase modifier relies on the terminal current to achieve AC demagnetization of the residual magnetism of the step-up transformer core during coasting, and therefore prolonging the coasting drag time is beneficial to accelerating the consumption of residual magnetism.

[0057] S104, when the rotor speed of the phase modifier is less than a second preset speed, performing excitation starting processing on the phase modifier according to the initial excitation target value; wherein the first preset speed is greater than the second preset speed;

[0058] The first preset speed is 3150 revolutions, and the second preset speed is 2900 revolutions.

[0059] On the basis of S103, in this step, after the rotor speed is reduced to a certain extent, in order to ensure that the phase modifier can be started smoothly and meet the grid-connection requirements, the initial excitation target value needs to be restored for excitation starting processing.

[0060] That is, when the rotor speed is less than the second preset speed (for example, 2900 revolutions), the parameters of the excitation regulator are modified again to restore the excitation target value to the initial excitation target value. For example, from 10kV to 20kV. This ensures that the phase modifier can obtain appropriate excitation at different speed stages, and improves the success rate and stability of starting and grid-connection.

[0061] S105, when the excitation starting processing corresponding to the initial excitation target value is completed, performing grid-connection processing.

[0062] On the basis of S104, this step aims to perform grid-connection processing when the phase modifier completes the excitation starting processing with the initial excitation target value, so that the parameters of the phase modifier meet the grid-connection requirements, and the phase modifier can be smoothly connected to the grid to realize normal operation.

[0063] By monitoring the parameters of the phase modifier, such as voltage, frequency, etc., when the parameters meet the grid-connected conditions, the control module issues a grid-connected instruction to complete the grid-connected operation. The safe, stable and grid-connected operation of the phase modifier is realized, which ensures that it can provide effective reactive power compensation for the power system and improves the stability and reliability of the power system.

[0064] By adopting the half-voltage excitation starting processing mode, the residual magnetism of the phase modifier step-up transformer can be effectively eliminated, and the success rate of grid-connected starting is improved. During the starting process, excitation starting processing is first performed according to the first starting target value, which reduces the starting initial excitation inrush current, reduces the impact on the equipment, and avoids the increase of residual magnetism caused by excessive excitation current. When the rotor speed of the phase modifier is greater than or equal to the first preset speed, the excitation system exits operation, which is helpful to eliminate the residual magnetism. When the rotor speed of the phase modifier is less than the second preset speed, excitation starting processing is performed again according to the initial starting target value to realize grid-connected processing. Through the synergistic effect of these steps, the residual magnetism can be effectively eliminated, the occurrence of residual magnetism in the starting process of the phase modifier is avoided, and the success rate and stability of grid-connected starting are greatly improved.

[0065] In the previous embodiment, how to start repeatedly once is mainly explained. Further, it can also be started repeatedly multiple times to better eliminate the residual magnetism at the machine end and improve the success rate and stability of grid-connected.

[0066] Step 1: When the rotor speed of the phase modifier is less than the second preset speed, excitation starting processing is performed on the phase modifier according to the second starting target value; wherein the first starting target value is less than the second starting target value, which is less than the initial starting target value;

[0067] Step 2: When the rotor speed of the phase modifier is greater than or equal to the first preset speed, the excitation system exits operation;

[0068] Step 3: When the rotor speed of the phase modifier is less than the second preset speed, the step of excitation starting processing corresponding to the initial starting target value is executed.

[0069] The second starting target value is 75% of the initial starting target value.

[0070] It can be seen that in the optional scheme, the second starting target value is used to realize twice excitation, which improves the success rate of starting and grid-connected.

[0071] The starting and grid-connected device provided by the embodiment of the application is introduced below, and the starting and grid-connected device and the starting and grid-connected method described below can be correspondingly referred to each other.

[0072] Please refer to Figure 2 , Figure 2 The structure diagram of the starting and grid-connected device of the phase modifier system provided by the embodiment of the application is shown.

[0073] In this embodiment, the device can include:

[0074] The instruction receiving module 100 is configured to receive a start instruction

[0075] The first excitation starting module 200 is configured to perform excitation starting processing on the phase modifier according to a first excitation target value; the first excitation target value is half of an initial excitation target value.

[0076] The first stopping module 300 is configured to control the excitation system to exit operation when the rotor speed of the phase modifier is greater than or equal to a first preset speed.

[0077] The target excitation starting module 400 is configured to perform excitation starting processing on the phase modifier according to the initial excitation target value when the rotor speed of the phase modifier is less than a second preset speed; the first preset speed is greater than the second preset speed.

[0078] The grid-connected processing module 500 is configured to perform grid-connected processing when the excitation starting processing corresponding to the initial excitation target value is completed.

[0079] The application further provides a start and grid-connected device, please refer to Figure 3 , Figure 3 The structure diagram of the start and grid-connected device provided by the embodiment of the application can include:

[0080] The memory is configured to store a computer program.

[0081] The processor is configured to implement the steps of any start and grid-connected method as described above when executing the computer program.

[0082] As shown in Figure 3 , the composition structure diagram of the start and grid-connected device can include a processor 10, a memory 11, a communication interface 12 and a communication bus 13. The processor 10, the memory 11 and the communication interface 12 all complete communication with each other through the communication bus 13.

[0083] In the embodiment of the application, the processor 10 can be a central processing unit (CPU), an application specific integrated circuit, a digital signal processor, a field programmable gate array or other programmable logic devices, etc.

[0084] The processor 10 can call the program stored in the memory 11, specifically, the processor 10 can execute the operations in the embodiment of the abnormal IP identification method.

[0085] The memory 11 stores one or more programs, which can include program codes including computer operation instructions. In the embodiment of the present application, the memory 11 at least stores programs for implementing the following functions:

[0086] The control module of the phase modifier receives the starting instruction;

[0087] The phase modifier is excited and started according to the first starting target value; wherein the first starting target value is half of the initial starting target value;

[0088] When the rotor speed of the phase modifier is greater than or equal to the first preset speed, the excitation system exits the operation;

[0089] When the rotor speed of the phase modifier is less than the second preset speed, the phase modifier is excited and started according to the initial starting target value; wherein the first preset speed is greater than the second preset speed;

[0090] When the excitation and starting processing corresponding to the initial starting target value is completed, grid connection processing is performed.

[0091] In a possible implementation, the memory 11 can include a program storage area and a data storage area. The program storage area can store an operating system and at least one application program required by a function, etc. The data storage area can store data created during use.

[0092] In addition, the memory 11 can include a high-speed random access memory, and can also include a non-volatile memory, such as at least one magnetic disk storage device or other volatile solid-state storage device.

[0093] The communication interface 12 can be an interface of a communication module, used for connecting with other devices or systems.

[0094] Of course, it should be noted that, Figure 3 The structures shown do not constitute a limitation on the starting and grid connection device in the embodiment of the present application. In actual application, the starting and grid connection device can include more or fewer components than Figure 3 those shown, or some components can be combined.

[0095] The present application also provides a computer readable storage medium, which stores a computer program. When the computer program is executed by a processor, the steps of the starting and grid connection method of any one of the phase modifier systems described above can be implemented.

[0096] The computer readable storage medium can include a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0097] The computer readable storage medium provided by the present application is described above with reference to the method embodiments. The present application will not be repeated here.

[0098] The various embodiments described in the specification are progressive in nature. Each embodiment highlights the differences from other embodiments. The same or similar parts between embodiments can be mutually referred to. For the device disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the relevant parts are described in the method part.

[0099] The skilled person can further realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be realized by electronic hardware, computer software or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the components and steps of the examples have been described in the above description in general terms. Whether the functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. The skilled person can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0100] The steps of the method or algorithm described in combination with the embodiments disclosed herein can be directly implemented by hardware, software modules executed by a processor, or a combination of the two. The software modules can be placed in random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disks, removable disks, CD-ROMs, or any other form of storage medium known in the art.

[0101] The above provides a method for starting and connecting to a grid of a phase modulation machine, a device for starting and connecting to a grid of a phase modulation machine, a starting and connecting device, and a computer readable storage medium. The principles and implementation modes of the present application are described by applying specific examples. The above description of the embodiments is only to help understand the method and its core idea. It should be noted that for those skilled in the art, without departing from the principles of the present application, some improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A method for starting and connecting to the grid of a phase-shifting system, characterized in that: include: The control module of the phase regulator receives a start command; Performing excitation startup processing on the phase regulator according to a first excitation starting target value; wherein the first excitation starting target value is half of the initial excitation starting target value; When the rotor speed of the phase regulator is greater than or equal to a first preset speed, the excitation system stops running; When the rotor speed of the phase regulator is less than a second preset speed, the phase regulator is subjected to excitation startup processing according to the initial excitation target value; wherein the first preset speed is greater than the second preset speed, the first preset speed is 3150 rpm, and the second preset speed is 2900 rpm; When the excitation start-up process corresponding to the initial excitation target value is completed, grid connection processing is performed; Wherein, when the rotor speed of the phase regulator is greater than or equal to 3150 rpm, the state of the excitation system is exiting operation and the step-up transformer is not connected to the grid, and the phase regulator becomes an energy isolation system and stops receiving external energy input; wherein, an alternating current appears on the machine-end winding of the step-up transformer, and this current causes the winding magnetic field of the step-up transformer to change along the hysteresis loop, and the energy isolation system causes the machine-end current to continuously decay, realizing the AC demagnetization method to gradually reduce the demagnetization current, driving the residual magnetism inside the iron core of the step-up transformer to gradually reduce the hysteresis loop area; wherein, during the idling period, the phase regulator realizes AC demagnetization of the residual magnetism of the iron core of the step-up transformer through the machine-end current, prolongs the idling drag time and increases the speed of residual magnetism consumption; When the rotor speed of the phase regulator is greater than or equal to the first preset speed, after the excitation system exits operation, the method further includes: When the rotor speed of the phase regulator is less than the second preset speed, the phase regulator is excitation started according to the second excitation target value; wherein, the first excitation target value is less than the second excitation target value and less than the initial excitation target value; when the rotor speed of the phase regulator is greater than or equal to the first preset speed, the excitation starting system exits operation; when the rotor speed of the phase regulator is less than the second preset speed, the excitation starting processing steps corresponding to the initial excitation target value are executed; wherein, the second excitation target value is 75% of the initial excitation target value.

2. The grid-connected startup method according to claim 1, characterized in that: The control module of the condenser receives the start command, including: The control module receives the start instruction from the operation interface of the phase regulator.

3. A starting and grid-connected device for a phase-shifting system, characterized in that: include: Instruction receiving module, used to receive the start instruction A first excitation starting module is configured to perform excitation starting processing on the phase regulator according to a first excitation starting target value; wherein the first excitation starting target value is half of an initial excitation starting target value; A first stopping module is used to control the excitation system to stop running when the rotor speed of the phase regulator is greater than or equal to a first preset speed; a target excitation startup module, configured to perform excitation startup processing on the phase regulator according to the initial excitation target value when the rotor speed of the phase regulator is less than a second preset speed; wherein the first preset speed is greater than the second preset speed, the first preset speed is 3150 rpm, and the second preset speed is 2900 rpm; A grid-connection processing module, configured to perform grid-connection processing when the excitation startup processing corresponding to the initial excitation target value is completed; Wherein, when the rotor speed of the phase regulator is greater than or equal to 3150 rpm, the state of the excitation system is exiting operation and the step-up transformer is not connected to the grid, and the phase regulator becomes an energy isolation system and stops receiving external energy input; wherein, an alternating current appears on the machine-end winding of the step-up transformer, and this current causes the winding magnetic field of the step-up transformer to change along the hysteresis loop, and the energy isolation system causes the machine-end current to continuously decay, realizing the AC demagnetization method to gradually reduce the demagnetization current, driving the residual magnetism inside the iron core of the step-up transformer to gradually reduce the hysteresis loop area; wherein, during the idling period, the phase regulator realizes AC demagnetization of the residual magnetism of the iron core of the step-up transformer through the machine-end current, prolongs the idling drag time and increases the speed of residual magnetism consumption; a second excitation starting module, configured to, when the rotor speed of the phase regulator is less than the second preset speed, perform excitation starting processing on the phase regulator according to a second excitation starting target value; wherein the first excitation starting target value is less than the second excitation starting target value and less than the initial excitation starting target value; A second stopping module is configured to control the excitation system to stop operating when the rotor speed of the phase regulator is greater than or equal to the first preset speed; The third excitation starting module is used to execute the excitation starting processing steps corresponding to the initial excitation starting target value when the rotor speed of the phase regulator is less than the second preset speed; wherein the second excitation starting target value is 75% of the initial excitation target value.

4. The grid-connected startup device according to claim 3, characterized in that: The instruction receiving module is specifically configured to receive the start instruction from the operation interface of the phase modulator.

5. A grid-connected startup device, characterized in that: include: Memory for storing computer programs; A processor, configured to implement the steps of the grid-connection startup method according to any one of claims 1 to 2 when executing the computer program.

6. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method for starting grid connection according to any one of claims 1 to 2 are implemented.

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