Grid connection starting method of phase modifier system and related device

Abstract

The invention discloses a starting grid connection method of a phase modifier system, a starting grid connection device of the phase modifier system, starting grid connection equipment and a computer readable storage medium. The method comprises the steps that a control module of a phase modifier receives a starting instruction; performing excitation starting processing on the phase modifier according to the first excitation target value; wherein the first excitation target value is half of the initial excitation target value; when the rotating speed of the rotor of the phase modifier is greater than or equal to a first preset rotating speed, the excitation starting system quits operation; when the rotating speed of the rotor of the phase modifier is smaller than a second preset rotating speed, excitation starting processing is carried out on the phase modifier according to the initial excitation target value; wherein the first preset rotating speed is greater than the second preset rotating speed; and when excitation starting processing corresponding to the initial excitation starting target value is completed, grid-connected processing is carried out. According to the method, the condition of residual magnetism in the phase modifier starting process is avoided, and the success rate and the stability of starting grid connection are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric power equipment, and more specifically, relates to a method for starting and connecting a phase modulator system to a grid, a device for starting and connecting a phase modulator system to a grid, a starting and connecting device to a grid, and a computer-readable storage medium. Background Art

[0002] In the power system, the phase regulator, as a dynamic reactive power compensation device, is of great significance to ensure the stable operation of the power grid. However, during the operation of the phase regulator step-up transformer, DC bias or excessive residual magnetism may occur, which will cause a large excitation current to appear at the end of the phase regulator when starting the machine, which will not only affect the normal start-up of the phase regulator, but also may cause damage to the equipment. In addition, excessive residual magnetism will 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-shifting step-up transformer has DC bias or excessive residual magnetism, it will have an adverse effect on the normal operation of the power system. During the phase-shifting start-up process, excessive residual magnetism will cause a large excitation current at the machine end, 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 connected to the grid, affecting the stability and reliability of the power system.

[0004] Therefore, how to avoid residual magnetism during the startup of the phase regulator and improve the success rate of startup and grid connection is a key issue that technical personnel in this field are concerned about. Summary of the invention

[0005] The purpose of the present application is to provide a method for starting and connecting a phase regulator system to the grid, a device for starting and connecting a phase regulator system to the grid, a starting and connecting equipment, and a computer-readable storage medium. The method avoids the occurrence of residual magnetism during the startup of the phase regulator system, thereby improving the success rate and stability of starting and connecting the phase regulator to the grid.

[0006] In view of the above defects or improvement needs of the prior art, the present invention provides a method for starting and connecting to the grid of a phase modulator system, comprising:

[0007] The control module of the phase regulator receives a start command;

[0008] Performing excitation start-up processing on the phase regulator according to a first excitation start-up target value; wherein the first excitation start-up target value is half of the initial excitation start-up target value;

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

[0010] When the rotor speed of the phase regulator is less than a second preset speed, the phase regulator is subjected to excitation start-up processing according to the initial excitation start-up target value; wherein the first preset speed is greater than the second preset speed;

[0011] When the excitation start-up process corresponding to the initial excitation target value is completed, the grid connection process is performed.

[0012] Optionally, when the rotor speed of the phase regulator is greater than or equal to a first preset speed, after the excitation system exits operation, the method further includes:

[0013] When the rotor speed of the phase regulator is less than the second preset speed, the phase regulator is subjected to excitation start-up processing according to the second excitation start-up target value; wherein the first excitation start-up target value is less than the second excitation start-up target value and less than the initial excitation start-up target value;

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

[0015] When the rotor speed of the phase regulator is less than the second preset speed, a step of performing an excitation start-up process corresponding to the initial excitation target value is performed.

[0016] Optionally, the control module of the phase regulator receives a start instruction, including:

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

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

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

[0020] The present application also provides a starting and grid-connected device for a phase-shifting system, comprising:

[0021] Instruction receiving module, used to receive the start instruction

[0022] A first excitation starting module, used for performing 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 the initial excitation starting target value;

[0023] 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;

[0024] A target excitation starting module, used for performing excitation starting processing on the phase regulator according to the initial excitation starting 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;

[0025] The grid-connection processing module is used to perform grid-connection processing when the excitation start-up processing corresponding to the initial excitation target value is completed.

[0026] Optionally, also include:

[0027] A second excitation starting module is used to perform excitation starting processing on the phase regulator according to a second excitation starting target value when the rotor speed of the phase regulator is less than the second preset speed; 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;

[0028] A second 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 the first preset speed;

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

[0030] The present application also provides a grid-connected startup device, comprising:

[0031] Memory for storing computer programs;

[0032] A processor is used to implement the steps of the grid-connection startup method as described above when executing the computer program.

[0033] The present application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the method for starting grid connection as described above are implemented.

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

[0035] It has the following beneficial effects:

[0036] By adopting the half-voltage excitation startup processing method, the residual magnetism of the phase-shifting step-up transformer can be effectively eliminated, and the success rate of grid-connected startup can be improved. During the startup process, the excitation startup process is first performed according to the first excitation target value, which reduces the excitation surge current at the initial start-up, 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-shifting machine is greater than or equal to the first preset speed, the excitation system exits operation, which helps to eliminate the residual magnetism. When the rotor speed of the phase-shifting machine is less than the second preset speed, the excitation startup process is performed according to the initial excitation target value to achieve grid-connected processing. Through the synergistic effect of these steps, the residual magnetism can be effectively eliminated, ensuring that the phase-shifting machine avoids residual magnetism during the startup process, and greatly improving the success rate and stability of grid-connected startup. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0038] Figure 1 A flowchart of a method for starting and connecting to the grid of a phase modulator system provided in an embodiment of the present application;

[0039] Figure 2 A schematic diagram of the structure of a starting grid-connected device for a phase modulator system provided in an embodiment of the present application;

[0040] Figure 3 A schematic diagram of the structure of the grid-connected startup device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0041] The core of the present application is to provide a method for starting and connecting a phase modulator system to the grid, a device for starting and connecting a phase modulator system to the grid, a starting and connecting equipment, and a computer-readable storage medium. The method avoids the occurrence of residual magnetism during the startup of the phase modulator system, thereby improving the success rate and stability of starting and connecting the phase modulator to the grid.

[0042] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0043] The following describes a method for starting and connecting to the grid of a phase modulator system provided by the present application through an embodiment.

[0044] Please refer to Figure 1 , Figure 1 A flowchart of a method for starting and connecting to the grid of a phase modulator system provided in an embodiment of the present application.

[0045] This embodiment may include:

[0046] S101, the control module of the phase regulator receives a start instruction;

[0047] In this step, the start-up of the condenser needs to be triggered by the control module receiving the start-up instruction to trigger the entire start-up process. The control module receives the start-up instruction from the operation interface of the condenser. The operator issues the start-up instruction on the operation interface, and the control module receives and responds to the instruction. This provides a trigger mechanism for the start-up of the condenser to ensure the orderly progress of the start-up process.

[0048] Furthermore, this step may include: the control module receives a start instruction from an operation interface of the phase regulator.

[0049] S102, performing excitation start-up processing on the phase regulator according to a first excitation start-up target value; wherein the first excitation start-up target value is half of the initial excitation start-up target value;

[0050] Based on S101, this step adopts a lower first excitation target value to perform excitation startup processing at the initial startup stage, 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, thereby achieving excitation start at a lower voltage. The excitation inrush current at the initial start-up is reduced, the impact on the equipment is reduced, and the safe operation of the equipment is protected.

[0052] Among them, the half-voltage excitation demagnetization of the phase regulator uses the principle of AC demagnetization. By inputting a continuously changing and decreasing alternating voltage on the low-voltage side of the step-up transformer, the residual magnetism inside the step-up transformer core is driven to gradually reduce the hysteresis loop area.

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

[0054] Based on S102, when the rotor speed reaches a certain level, the excitation system will exit operation;

[0055] During the operation of the phase regulator, the rotor speed is monitored in real time. When the rotor speed is greater than or equal to the first preset speed (such as 3150 rpm), the control module issues a command to stop the excitation system from working instead of actually connecting to the grid. Reasonable control of the operating time of the excitation system improves energy utilization efficiency and reduces system complexity.

[0056] That is, when the rotor speed of the phase-converter reaches 3150 rpm, since the excitation system is out of operation and the step-up transformer is not connected to the grid, the phase-converter system designed as a self-excitation system becomes an energy isolation system and no longer receives external energy input. At this time, an alternating current is constantly appearing on the winding of the step-up transformer. This current causes the entire step-up transformer winding magnetic field to change along the hysteresis loop. It is also because of the energy isolation system that the machine-end current is also constantly decaying, which is equivalent to the demagnetization current gradually decreasing by the AC demagnetization method, driving the internal residual magnetism of the step-up transformer core to gradually reduce the hysteresis loop area. During the idling period, the phase-converter relies on the machine-end current to achieve AC demagnetization of the residual magnetism of the step-up transformer core. Therefore, extending the idling drag time is conducive to accelerating the consumption of residual magnetism.

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

[0058] Among them, the first preset speed is 3150 rpm, and the second preset speed is 2900 rpm.

[0059] On the basis of S103, in this step, after the rotor speed drops to a certain level, in order to ensure that the phase regulator can be started smoothly and meet the grid connection requirements, it is necessary to restore to the initial excitation target value for excitation start processing.

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

[0061] S105, when the excitation start-up process corresponding to the initial excitation target value is completed, the grid connection process is performed.

[0062] Based on S104, this step aims to ensure that the various parameters of the phase regulator meet the grid connection requirements after the phase regulator completes the excitation startup processing with the initial excitation target value. At this time, grid connection processing can enable the phase regulator to be smoothly connected to the grid and achieve normal operation.

[0063] By monitoring various parameters of the phase regulator, such as voltage, frequency, etc., when these parameters meet the grid connection conditions, the control module issues a grid connection command to complete the grid connection operation. The phase regulator is safely and stably connected to the grid, ensuring that it can provide effective reactive power compensation for the power system, and improving the stability and reliability of the power system.

[0064] By adopting the half-voltage excitation startup processing method, the residual magnetism of the phase-shifting step-up transformer can be effectively eliminated, and the success rate of grid-connected startup can be improved. During the startup process, the excitation startup process is first performed according to the first excitation target value, which reduces the excitation surge current at the initial start-up, 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-shifting machine is greater than or equal to the first preset speed, the excitation system exits operation, which helps to eliminate the residual magnetism. When the rotor speed of the phase-shifting machine is less than the second preset speed, the excitation startup process is performed according to the initial excitation target value to achieve grid-connected processing. Through the synergistic effect of these steps, the residual magnetism can be effectively eliminated, ensuring that the phase-shifting machine avoids residual magnetism during the startup process, and greatly improving the success rate and stability of grid-connected startup.

[0065] The above embodiment mainly describes how to start repeatedly once, and further, the start can be repeated multiple times to better eliminate the residual magnetism at the machine end and improve the success rate and stability of grid connection.

[0066] Step 1, when the rotor speed of the phase regulator is less than the second preset speed, the phase regulator is subjected to excitation start-up processing according to the second excitation start-up target value; wherein the first excitation start-up target value is less than the second excitation start-up target value and less than the initial excitation start-up target value;

[0067] Step 2, when the rotor speed of the phase regulator 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 regulator is less than the second preset speed, the excitation start-up processing step corresponding to the initial excitation target value is executed.

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

[0070] It can be seen that in this optional scheme, secondary excitation is achieved through the second excitation target value, which improves the success rate of starting and grid connection.

[0071] The following is an introduction to the grid-connected startup device provided in an embodiment of the present application. The grid-connected startup device and the grid-connected startup method described below can be referenced to each other.

[0072] Please refer to Figure 2 , Figure 2 A schematic diagram of the structure of a starting grid-connected device for a phase modulator system provided in an embodiment of the present application.

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

[0074] The command receiving module 100 is used to receive the start command

[0075] The first excitation starting module 200 is used 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 the initial excitation starting target value;

[0076] The first stop module 300 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;

[0077] The target excitation startup module 400 is used to perform excitation startup processing on the phase condenser according to the initial excitation target value when the rotor speed of the phase condenser is less than the second preset speed; wherein the first preset speed is greater than the second preset speed;

[0078] The grid connection processing module 500 is used to perform grid connection processing when the excitation start-up processing corresponding to the initial excitation target value is completed.

[0079] This application also provides the startup grid-connected equipment, please refer to Figure 3 , Figure 3 This is a schematic diagram of the structure of a grid-connected startup device provided in an embodiment of the present application. The grid-connected startup device may include:

[0080] Memory for storing computer programs;

[0081] The processor is used to implement any of the steps of the above-mentioned method for starting grid connection when executing the computer program.

[0082] like Figure 3 As shown, it is a schematic diagram of the composition structure of the startup grid-connected device, which may 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 communicate with each other through the communication bus 13.

[0083] In the embodiment of the present application, the processor 10 may 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.

[0084] The processor 10 may call a program stored in the memory 11. Specifically, the processor 10 may execute operations in an embodiment of the abnormal IP identification method.

[0085] The memory 11 is used to store one or more programs, which may include program codes, and the program codes include 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 regulator receives a start command;

[0087] Perform excitation start-up processing on the phase regulator according to the first excitation start-up target value; wherein the first excitation start-up target value is half of the initial excitation start-up target value;

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

[0089] When the rotor speed of the phase regulator is less than the second preset speed, the phase regulator is subjected to excitation start-up processing according to the initial excitation start-up target value; wherein the first preset speed is greater than the second preset speed;

[0090] When the excitation start-up process corresponding to the initial excitation target value is completed, the grid connection process is performed.

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

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

[0093] The communication interface 12 may be an interface of a communication module, and is used to connect to other devices or systems.

[0094] Of course, it should be noted that Figure 3 The structure shown does not constitute a limitation on starting the grid-connected device in the embodiment of the present application. In actual applications, starting the grid-connected device may include: Figure 3 More or fewer components than shown, or combinations of certain components.

[0095] The present application also provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of any of the above-mentioned methods for starting and connecting to the grid of a phase-shifting system can be implemented.

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

[0097] For an introduction to the computer-readable storage medium provided in this application, please refer to the above method embodiment, and this application will not go into details here.

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

[0099] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

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

[0101] The above is a detailed introduction to a method for starting and connecting to the grid of a phase regulator system, a device for starting and connecting to the grid of a phase regulator system, a starting and connecting to the grid equipment, and a computer-readable storage medium provided by the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A method for starting and connecting to the grid of a phase-converter system, characterized in that: include: The control module of the phase regulator receives a start command; Performing excitation start-up processing on the phase regulator according to a first excitation start-up target value; wherein the first excitation start-up target value is half of the initial excitation start-up target value; When the rotor speed of the phase regulator is greater than or equal to a first preset speed, the excitation system exits operation; When the rotor speed of the phase regulator is less than a second preset speed, the phase regulator is subjected to excitation start-up processing according to the initial excitation start-up target value; wherein the first preset speed is greater than the second preset speed; When the excitation start-up process corresponding to the initial excitation target value is completed, the grid connection process is performed.

2. The grid-connected startup method according to claim 1, characterized in that: 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 subjected to excitation start-up processing according to the second excitation start-up target value; wherein the first excitation start-up target value is less than the second excitation start-up target value and less than the initial excitation start-up target value; When the rotor speed of the phase regulator is greater than or equal to the first preset speed, the excitation system exits operation; When the rotor speed of the phase regulator is less than the second preset speed, a step of performing an excitation start-up process corresponding to the initial excitation target value is performed.

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

4. The grid-connected startup method according to claim 3, characterized in that: The second excitation starting target value is 75% of the initial excitation starting target value.

5. The grid-connected startup method according to claim 4, characterized in that: The first preset speed is 3150 rpm, and the second preset speed is 2900 rpm.

6. A starting and grid-connected device for a phase-converter system, characterized in that: include: Instruction receiving module, used to receive the start instruction A first excitation starting module, used for performing 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 the 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 starting module is used to perform excitation starting processing on the phase regulator according to the initial excitation starting 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 grid-connection processing module is used to perform grid-connection processing when the excitation start-up processing corresponding to the initial excitation target value is completed.

7. The grid-connected startup device according to claim 6, characterized in that: Also includes: A second excitation starting module is used to perform excitation starting processing on the phase regulator according to a second excitation starting target value when the rotor speed of the phase regulator is less than the second preset speed; 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 used to control the excitation system to stop running when the rotor speed of the phase regulator is greater than or equal to the first preset speed; 8. The grid-connected startup device according to claim 7, characterized in that: The instruction receiving module is specifically configured to receive the start instruction from the operation interface of the phase regulator.

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

10. 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 5 are implemented.

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