Phase modifier synchronization grid-connected frequency difference fixed value setting method and system

Abstract

The invention discloses a phase modifier synchronization grid-connected frequency difference fixed value setting method and system, and relates to the technical field of power system automatic control, and the method comprises the steps: collecting the rotating speed of a phase modifier in real time after the phase modifier enters a running-down state; drawing a rotating speed-time-based phase modifier running-down curve, and fitting to obtain a rotating speed-time function of the phase modifier; calculating an integral of a difference value between the rotating speed-time function and an actual power grid rated rotating speed to obtain a phase angle difference function between the phase modifier and an actual power grid in a grid connection process; based on a phase angle difference function, setting an initial phase angle of a phase modifier, enabling the phase angle difference to be equal to integral multiples of 2 pi, and meanwhile, based on a rotating speed-time function, enabling a rotating speed value to be equal to a rated rotating speed of an actual power grid, carrying out combined solving, and screening according to a plurality of time points obtained by solving to obtain leading and lagging grid-connected point switching-on time points; and a frequency difference setting value is obtained through calculation. According to the method, the optimal constant value of synchronous grid connection can be determined, and the impact on the unit can be minimized while 100% grid connection can be realized.

Description

Technical Field

[0001] The present invention relates to the technical field of automatic control of electric power systems, and in particular to a method and system for setting a frequency difference constant value of a phase regulator connected to a grid synchronously. Background Art

[0002] In recent years, synchronous condensers have been widely used in power grid DC converter stations. Synchronous condensers can effectively suppress commutation failures and improve system stability by using their dynamic reactive power support capabilities and transient voltage regulation capabilities. In addition, distributed condensers are also widely used in new energy stations. Compared with power electronic compensation equipment, distributed condensers have unique advantages in providing short-circuit capacity and short-term overload capacity to the system. At the same time, they can also provide inertia support, playing an important role in improving the voltage stability of new energy stations.

[0003] In terms of phase-converter operation control, synchronous grid connection is a key technology in the phase-converter grid connection process. Since the phase-converter is not driven by a prime mover, it usually enters the idling state after being dragged to a certain speed such as 1.05 times the rated speed by the SFC (static variable frequency starting device). During the idling process, the synchronization system captures the appropriate synchronization point to connect to the grid and issues a grid connection command. Therefore, it is necessary to analyze the phase-converter idling grid connection process to determine the phase-converter grid connection success rate under the current set value or the set value that meets the 100% grid connection condition. Among them, considering that the phase-converter speed cannot be controlled and decreases at a certain rate during the idling process, the phase-converter is mostly connected to the grid using the difference frequency method. The difference frequency grid connection refers to the grid connection operation performed when the voltage and frequency on both sides of the parallel point are similar and the phase difference is 0 degrees. The most critical idling grid connection parameter is the frequency difference set value (referred to as the frequency difference set value). If the frequency difference set value is set too large, it will bring a greater grid connection impact to the phase-converter, while a smaller frequency difference setting range will result in no synchronous grid connection point.

[0004] The existing setting method of synchronous grid-connected constant parameters still has certain problems: since the calculation of phase-shifting grid-connected parameters is relatively complex, it requires one unit, one characteristic, and one analysis, without any consistency and universality. At present, the analysis and calculation of the frequency difference of the grid-connected points that need to be dynamically captured during the phase-shifting grid-connected process is mainly based on mathematical models, which is difficult for ordinary personnel to master. Under normal circumstances, the staff still uses empirical values ​​and repeatedly dragging the phase-shifting on site to verify the rationality of the synchronous grid-connected constant parameters. On the one hand, this will increase the dragging burden and workload of the unit, and according to the requirements of the regulations and specifications, the false synchronization test should be completed before the grid connection stage, at least 3 times, which has high requirements for the unit and auxiliary systems; on the other hand, the rationality and accuracy of the constant setting are difficult to guarantee, and it is difficult to balance and determine the minimization of the impact current on the unit itself and the success rate of grid connection during the synchronization process. In addition, there is currently a lack of targeted devices to carry out analysis and constant calculation of the synchronization process, which poses safety risks. Summary of the invention

[0005] In order to address the deficiencies of the above-mentioned prior art, the present invention provides a method and system for setting the frequency difference constant of synchronous grid-connected phase regulators. The method measures and obtains the actual speed parameters of the phase regulators during idling, generates an idling curve of the phase regulators, and determines the optimal constant of synchronous grid-connection through effective analysis and calculation of the idling curve, thereby ensuring that 100% grid-connection can be achieved while minimizing the impact on the units, effectively reducing the influence of human factors and ensuring the accuracy of the constant.

[0006] In a first aspect, the present invention provides a method for setting a frequency difference constant of a synchronous grid-connected phase regulator.

[0007] A method for setting a frequency difference constant value of a synchronous grid-connected phase regulator, comprising: Real-time acquisition of the rotation speed of the condenser after it enters the idling state; According to the collected condenser speed, the condenser idling curve based on speed-time is drawn, and the speed-time function of the condenser is obtained by fitting; Calculate the integral of the difference between the speed-time function of the phase regulator and the actual rated speed of the power grid, and obtain the phase angle difference function between the phase regulator and the actual power grid during the grid connection process; Based on the phase angle difference function, the initial phase angle of the phase regulator is set to an integer multiple of 2π. At the same time, based on the speed-time function, the speed value is set to be equal to the rated speed of the actual power grid. This is used for joint solution, and multiple time points obtained are screened to obtain the leading and lagging grid connection point closing time points. The frequency difference setting value is calculated based on the leading and lagging grid-connected point closing times.

[0008] In a second aspect, the present invention provides a frequency difference setting system for synchronous grid-connected phase regulators.

[0009] A frequency difference setting system for synchronous grid-connected phase regulators, comprising: The sampling module is used to collect the rotation speed of the phase regulator in real time after it enters the idling state; The data analysis module is used to draw the phase condenser idling curve based on speed-time according to the collected phase condenser speed, and fit the speed-time function of the phase condenser; calculate the integral of the difference between the speed-time function of the phase condenser and the rated speed of the actual power grid, and obtain the phase angle difference function between the phase condenser and the actual power grid during the grid connection process; based on the phase angle difference function, set the initial phase angle of the phase condenser, so that the phase angle difference is equal to an integer multiple of 2π, and at the same time, based on the speed-time function, set the speed value to the rated speed of the actual power grid, so as to perform a joint solution, and screen the multiple time points obtained by the solution to obtain the leading and lagging grid connection point closing time points, and then calculate the frequency difference setting value.

[0010] Further technical solutions include: The operation display module is used to input and display the phase regulator synchronization grid-connected related parameters and calculate the frequency difference setting value; wherein, the related parameters include unit information, grid-connected voltage, transformer ratio, closing lead time, and synchronization device information.

[0011] In a third aspect, the present invention further provides an electronic device, comprising: a memory for storing executable instructions; and a processor for implementing the above-mentioned method for setting a frequency difference constant of a synchronous phase-shifting phase connected to the grid when executing the executable instructions stored in the memory.

[0012] In a fourth aspect, the present invention further provides a computer-readable storage medium storing executable instructions for causing a processor to execute the executable instructions to implement the above-mentioned method for setting a constant value of the synchronous grid-connected frequency difference of a phase regulator.

[0013] In a fifth aspect, the present invention further provides a computer program product, which includes executable instructions, and the executable instructions are stored in a computer-readable storage medium; wherein, when the processor of the electronic device reads the executable instructions from the computer-readable storage medium and executes the executable instructions, the above-mentioned method for setting the frequency difference constant of the synchronous grid-connected phase-shifting phase is implemented.

[0014] One or more of the above technical solutions have the following beneficial effects: 1. The present invention provides a method and system for setting the frequency difference constant of synchronous grid-connected phase shifters. The actual speed data of the phase shifters in the idling process is measured and obtained by any means such as voltage, small current signal, digital signal, etc., so as to fit the idling curve of the phase shifters more simply and conveniently. After effective analysis and calculation of the idling curve, the optimal frequency difference constant of synchronous grid-connected phase is determined to ensure that 100% grid-connected phase can be achieved while minimizing the impact on the units. The influence of human factors can be effectively reduced, the accuracy of the frequency difference constant is ensured, and the frequent dragging of the units and the number of false synchronizations are reduced, thereby improving the efficiency and progress of on-site work and reducing the workload of personnel.

[0015] 2. In the method for setting the frequency difference of synchronous grid-connected phase shifter proposed in the present invention, the phase difference function in the grid-connected process is obtained by integrating the fitted idling curve with the actual rated speed of the power grid, and then combining the rotation characteristics of the phase difference function to analyze the characteristics of the phase difference function, and it is clear that the final frequency difference setting is actually to find the maximum value of the minimum point of the grid-connected frequency difference. Based on this, the speed-time function and the phase difference function describing the idling curve are used to solve the final set frequency difference and its range. Within the frequency difference range, there must be a grid-connected point that can meet the grid-connected closing conditions, and the impact of grid-connected closing on the unit at this grid-connected point is minimal. The above method proposed in the present invention has a simple calculation process, low computational cost, and high efficiency, and can conveniently, quickly, and accurately complete the setting of the frequency difference of synchronous grid-connected phase shifter, thereby realizing synchronous grid-connected phase shifter.

[0016] 3. The present invention also proposes a frequency difference setting system for synchronous grid-connected phase regulators. The system can be implemented through a specific device. It can directly and automatically calculate and output accurate frequency difference setting values ​​through the input of relevant parameters of synchronous grid-connected phase regulators. It is convenient for on-site use, improves on-site work efficiency and progress, reduces the workload of personnel, and has higher and wider applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0018] Figure 1 It is an overall flow chart of the method for setting the frequency difference constant value of the phase regulator synchronously connected to the grid according to an embodiment of the present invention; Figure 2 It is a schematic diagram of the phase regulator idling curve in an embodiment of the present invention; Figure 3 A schematic diagram of a curve of a grid-connected phase angle difference function of a phase modulator in an embodiment of the present invention; Figure 4 Schematic diagram of actual phase angle difference of phase regulator connected to the grid in an embodiment of the present invention; Figure 5 It is a schematic diagram of a frequency difference setting system for synchronous grid-connected phase regulators according to an embodiment of the present invention.

[0019] Among them, 1. Sampling module; 2. Data analysis module; 3. Operation and display module; 4. Shell; 5. Voltage signal interface; 6. 4~20mA small current signal interface; 7. Communication interface; 8. Operation panel; 9. Display screen; 10. Power interface; 11. Ground interface. DETAILED DESCRIPTION

[0020] It should be noted that the following detailed descriptions are exemplary only, are intended to describe specific embodiments, are intended to provide further explanation of the present invention, and are not intended to limit exemplary embodiments according to the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those of ordinary skill in the art to which the present invention belongs. In addition, it should also be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0021] Embodiment 1 This embodiment provides a method for setting the frequency difference of phase-converter synchronous grid connection. Figure 1 As shown, the specific steps include: Step S1: Real-time acquisition of the rotation speed of the phase regulator after it enters the idling state. Specifically, considering the different actual situations, a variety of different methods can be used to obtain the rotation speed of the phase regulator, including: (1) Collect the terminal voltage signal of the phase regulator, analyze and process it according to the voltage frequency or voltage signal period of the terminal voltage signal, and calculate the unit speed. For example, according to the voltage frequency of the terminal voltage (unit Hz), using the formula Calculate the unit speed (unit rpm ); or, according to the voltage signal cycle of the terminal voltage (unit s), using the formula Calculate the unit speed (unit rpm ).

[0022] (2) Obtain the 4~20mA small current signal I after the speed conversion collected by the signal sensor. According to the small current signal I collected by the signal sensor, use the formula , calculate the unit speed. Among them, 3500 rpm The speed corresponding to the upper limit of the signal sensor, that is, the speed value corresponding to 20mA; 0 rpm It is the speed corresponding to the lower limit of the signal sensor, that is, the speed value corresponding to 4mA.

[0023] (3) Directly collect the speed digital signal through the network cable to obtain the unit speed.

[0024] The above-mentioned acquisition of the rotation speed of the phase condenser by multiple methods can ensure the effective acquisition of the phase condenser rotation speed and the accuracy of the acquired rotation speed. For example, comparison and verification can be performed by multiple methods to ensure the effective and accurate acquisition of the final rotation speed.

[0025] Step S2: according to the collected phase condenser speed, draw the phase condenser idling curve based on speed-time, and obtain the speed-time function of the phase condenser by fitting.

[0026] The phase shifter speed obtained by the above acquisition is used to obtain the function of speed with respect to time. , the typical phase condenser idling curve is as follows Figure 2 As shown, the rated speed of the power system is close to 3000 rpm (The rated frequency of the power system is 50Hz, corresponding to a speed of 3000 rpm ) can be approximated as a straight line, and the idling slope can be obtained by curve fitting. k , and then we can get the speed-time function. The linear function expression of the speed with respect to time can be expressed as: (1) In the above formula,k represents the idling slope, t Indicates time, Indicates the initial speed value.

[0027] Step S3, calculating the integral of the difference between the speed-time function of the phase regulator and the rated speed of the actual power grid, and obtaining the phase angle difference function between the phase regulator and the actual power grid during the grid connection process.

[0028] Specifically, the difference between the phase shifter speed-time function and the rated speed of the actual power grid (i.e., the power system) is calculated, where the rated speed of the power system is 3000 rpm , integrate the difference to get the phase angle difference between the phase regulator and the actual power grid during the phase regulator grid connection process. The phase angle difference function can be expressed as: (2) (3) In the above formula, represents the initial phase angle, Indicates the phase angle difference.

[0029] After the above calculation, we get the quadratic function of the phase angle difference with respect to time. The typical phase angle difference is as follows: Figure 3 As shown in the figure. Since the phase regulator is a rotating device, the phase angle returns to zero after every cycle (i.e. 2π), and then the phase angle difference returns to zero. The actual phase angle difference of the phase regulator connected to the grid is as follows: Figure 4 shown.

[0030] Step S4, based on the phase angle difference function, set the initial phase angle of the phase regulator, make the phase angle difference equal to an integer multiple of 2π, and based on the speed-time function, make the speed value equal to the rated speed of the actual power grid, so as to perform a joint solution, and filter according to the multiple time points obtained by the solution to obtain the leading and lagging grid connection point closing time points.

[0031] Combination Figure 4 visible, Figure 4 Each point where the phase angle difference is 0 is the target grid connection point, and the target grid connection points appear periodically and at different intervals; considering that the speed = frequency * 60, the speed corresponds to the frequency, and when the speed is closest to the rated speed, the frequency is closest to the rated frequency. At this time, the frequency difference between the phase regulator and the power system is the smallest, that is, the grid connection point closest to the rated speed has the smallest frequency difference. In this embodiment, according to the speed-time function of the phase regulator, let the speed value be equal to the rated speed of the actual power grid, and solve to obtain the midpoint time At this midpoint, the grid-connected frequency difference between the phase regulator and the power system is the smallest.

[0032] Furthermore, considering that the initial phase angle of the phase regulator is a random value at the beginning of grid connection, this value cannot be determined. Since the initial time of grid connection of the phase regulator is not fixed in different cases, the initial phase angle is different. This uncertainty leads to different frequency differences at the time of grid connection. Therefore, the ultimate goal is actually to find the maximum value of the minimum point of the grid connection frequency difference, that is, the required frequency difference is the initial phase angle When different values ​​are taken, the maximum frequency difference closest to the rated speed is obtained. In this embodiment, the initial phase angle is set , let the phase angle difference be close to an integer multiple of 2π (at this time the phase angle difference is close to 0), and solve it in this way. For the several time points obtained by the solution, the two time points before and after the closest to the midpoint are taken as the leading and lagging grid connection point closing time points. At this time, the target grid connection point corresponding to these two time points is farthest from the rated speed, and the frequency difference generated is the largest. Within the frequency difference range corresponding to these two time points, there must be a grid connection point that can meet the grid connection closing conditions, and at this grid connection point, the impact of grid connection closing on the unit is minimal.

[0033] After the above analysis, solve the following equations: (4) (5) In the above formula, Is a positive integer.

[0034] After solving, the midpoint time is calculated As well as the advanced and delayed grid connection point closing time points , .

[0035] Step S5: Calculate the frequency difference setting value according to the leading and lagging grid connection point closing times.

[0036] Specifically, the time point obtained is , Substitute into the above formula (1) and solve to get the corresponding speed , , which correspond to the leading and lagging grid connection point speeds respectively; further, according to speed = frequency * 60 and the rated frequency of the power system is 50Hz, the frequency difference setting value can be calculated as , , and then determine the frequency difference range , within this frequency difference range, there must be a grid connection point that can meet the grid connection closing conditions, and at this grid connection point, the impact of grid connection closing on the unit is minimal.

[0037] Embodiment 2 This embodiment provides a phase regulator synchronous grid-connected frequency difference setting system, which can be implemented by a specific device, such as Figure 5As shown, it includes a sampling module 1, a data analysis module 2 and an operation display module 3, specifically: The sampling module is used to collect the rotation speed of the phase regulator in real time after it enters the idling state; The data analysis module is used to draw the phase condenser idling curve based on speed-time according to the collected phase condenser speed, and fit the speed-time function of the phase condenser; calculate the integral of the difference between the speed-time function of the phase condenser and the rated speed of the actual power grid, and obtain the phase angle difference function between the phase condenser and the actual power grid during the grid connection process; based on the phase angle difference function, set the initial phase angle of the phase condenser, make the phase angle difference equal to an integer multiple of 2π, and at the same time, based on the speed-time function, make the speed value equal to the rated speed of the actual power grid, so as to perform a joint solution, and screen according to the multiple time points obtained by the solution, obtain the leading and lagging grid connection point closing time points, and then calculate the frequency difference setting value; The operation and display module is used to input and display the phase regulator synchronization grid-connected related parameters and calculate the frequency difference setting value; wherein, the related parameters include unit information, grid-connected voltage, transformer ratio, closing lead time, synchronization device information, etc.

[0038] In this embodiment, the phase-converter synchronous grid-connected frequency difference setting system is realized by a specific device, which includes a housing 4, on which a sampling module 1 for executing a sampling link is provided, and the module includes a voltage signal interface 5, a 4~20mA small current signal interface 6, and a communication interface 7, which can respectively collect the phase-converter terminal voltage signal, small current signal, and speed digital signal; a data analysis module 2 is provided in the housing 4, which is used to perform data analysis calculations, that is, to perform the phase-converter synchronous grid-connected frequency difference setting method proposed in the above embodiment 1; an operation display module 3 is provided on the outer surface of the housing 4, and the operation display module 3 includes an operation panel 8 and a display screen 9, and the operation panel 8 is provided with a variety of operation buttons for inputting phase-converter synchronous grid-connected related parameters, and the display screen 9 is used to display the input phase-converter synchronous grid-connected related parameters and the calculated frequency difference setting value. In addition, the device is also provided with a power supply interface 10 and a grounding interface 11, etc., for subsequent safe and convenient use.

[0039] Embodiment 3 This embodiment provides an electronic device, including: a memory, used to store executable instructions; and a processor, used to implement the above method provided in this embodiment when executing the executable instructions stored in the memory.

[0040] Embodiment 4 This embodiment also provides a computer-readable storage medium storing executable instructions. When the executable instructions are executed by a processor, the processor will be caused to execute the above method provided in this embodiment.

[0041] Embodiment 5 This embodiment provides a computer program product, which includes an executable instruction, which is a computer instruction; the executable instruction is stored in a computer-readable storage medium. When a processor of an electronic device reads the executable instruction from the computer-readable storage medium and the processor executes the executable instruction, the electronic device executes the above method provided in this embodiment.

[0042] The steps involved in the above embodiments 2 to 5 correspond to the method embodiment 1. For the specific implementation, please refer to the relevant description part of embodiment 1. The term "computer-readable storage medium" should be understood as a single medium or multiple media including one or more instruction sets; it should also be understood to include any medium that can store, encode or carry an instruction set for execution by a processor and enable the processor to execute any method in the present invention.

[0043] Those skilled in the art should understand that the modules or steps of the present invention described above can be implemented by a general-purpose computer device, or alternatively, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. The present invention is not limited to any specific combination of hardware and software.

[0044] The above description is only a preferred embodiment of the present invention. Although the specific implementation mode of the present invention is described in conjunction with the accompanying drawings, it is not a limitation of the protection scope of the present invention. Those skilled in the art should understand that on the basis of the technical solution of the present invention, various modifications or variations that can be made by those skilled in the art without creative work are still within the protection scope of the present invention.

Claims

1. A method for setting the frequency difference of a phase regulator synchronously connected to the grid, characterized in that: include: Real-time acquisition of the rotation speed of the condenser after it enters the idling state; According to the collected condenser speed, the condenser idling curve based on speed-time is drawn, and the speed-time function of the condenser is obtained by fitting; Calculate the integral of the difference between the speed-time function of the phase regulator and the actual rated speed of the power grid, and obtain the phase angle difference function between the phase regulator and the actual power grid during the grid connection process; Based on the phase angle difference function, the initial phase angle of the phase regulator is set to an integer multiple of 2π. At the same time, based on the speed-time function, the speed value is set to be equal to the rated speed of the actual power grid. This is used for joint solution, and multiple time points obtained are screened to obtain the leading and lagging grid connection point closing time points. The frequency difference setting value is calculated based on the leading and lagging grid-connected point closing times.

2. A method for setting the frequency difference of a phase regulator connected to the grid synchronously as claimed in claim 1, characterized in that: Collect and obtain the speed of the phase regulator, including: Collect the terminal voltage signal of the phase regulator, and calculate the unit speed, that is, the speed of the phase regulator, according to the voltage frequency or voltage signal period of the terminal voltage signal; Obtain the small current signal I collected by the signal sensor, and calculate the unit speed, that is, the speed of the phase regulator, based on the small current signal I and the speed corresponding to the upper and lower limits of the signal sensor; Collect the speed digital signal to obtain the unit speed, that is, the speed of the phase regulator.

3. A method for setting the frequency difference of a phase regulator connected to the grid synchronously as claimed in claim 1, characterized in that: The speed-time function is a linear function of the speed with respect to time, and the expression of the function is: ; The phase angle difference function between the phase regulator and the actual power grid during the grid connection process is: ； In the above formula, k represents the idling slope, t Indicates time, Indicates the initial value of the speed. represents the initial phase angle, Indicates the phase angle difference.

4. A method for setting the frequency difference of a phase regulator synchronously connected to the grid as claimed in claim 1, characterized in that: The frequency difference setting of synchronous grid-connected phase regulator refers to finding and solving the maximum value of the minimum grid-connected frequency difference, including: According to the speed-time function of the phase regulator, let the speed value be equal to the rated speed of the actual power grid, and solve for the midpoint time , at the midpoint The frequency difference between the time-controlled servo motor and the power grid is minimal; Based on the phase angle difference function, the initial phase angle of the phase condenser is set, and the phase angle difference is equal to an integer multiple of 2π, and several time points are obtained by solving; The two time points closest to the midpoint are the leading and lagging grid connection closing time points. and , the target grid-connected points corresponding to these two time points are farthest from the rated speed, and the resulting frequency difference is the largest.

5. A method for setting the frequency difference of a phase regulator synchronously connected to the grid as claimed in claim 4, characterized in that: According to the obtained leading and lagging grid connection point closing time points and , substitute into the speed-time function and solve for the corresponding speed , , corresponding to the leading and lagging grid connection point speeds respectively; According to speed = frequency * 60 and the rated frequency of the power system, the frequency difference setting value is calculated and the frequency difference range is determined.

6. A frequency difference setting system for synchronous grid-connected phase regulator, characterized in that: include: The sampling module is used to collect the rotation speed of the phase regulator in real time after it enters the idling state; The data analysis module is used to draw the phase condenser idling curve based on speed-time according to the collected phase condenser speed, and fit the speed-time function of the phase condenser; calculate the integral of the difference between the speed-time function of the phase condenser and the rated speed of the actual power grid, and obtain the phase angle difference function between the phase condenser and the actual power grid during the grid connection process; based on the phase angle difference function, set the initial phase angle of the phase condenser, so that the phase angle difference is equal to an integer multiple of 2π, and at the same time, based on the speed-time function, set the speed value to the rated speed of the actual power grid, so as to perform a joint solution, and screen the multiple time points obtained by the solution to obtain the leading and lagging grid connection point closing time points, and then calculate the frequency difference setting value.

7. A phase regulator synchronous grid-connected frequency difference setting system as claimed in claim 6, characterized in that: Also includes: Operation and display module, used to input and display phase regulator synchronization grid-connected related parameters and calculate the frequency difference setting value; The relevant parameters include unit information, grid-connected voltage, transformer ratio, closing lead time, and synchronization device information.

8. An electronic device, characterized in that: include: A memory for storing executable instructions; The processor is used to implement the method for setting the frequency difference constant of a synchronous phase-converter connected to the grid as described in any one of claims 1 to 5 when executing the executable instructions stored in the memory.

9. A computer-readable storage medium, characterized in that: Executable instructions are stored, which are used to cause the processor to execute the executable instructions to implement a method for setting a frequency difference constant value of a phase-converter synchronously connected to the grid as described in any one of claims 1-5.

10. A computer program product, characterized in that The computer program product includes executable instructions stored in a computer-readable storage medium; When the processor of the electronic device reads the executable instructions from the computer-readable storage medium and executes the executable instructions, the method for setting the frequency difference constant of the synchronous grid-connected phase regulator described in any one of claims 1 to 5 is implemented.

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