Variable-frequency voltage transformation system for wind power, method, and device

Abstract

The present invention relates to the field of transformers. Disclosed are a variable-frequency voltage transformation system, a method, and a device. Low-frequency electrical energy lower than a first preset frequency threshold is inputted, comprising low-frequency low-voltage electrical energy or low-frequency high-voltage electrical energy. High-frequency electrical energy higher than a second preset frequency threshold is obtained, comprising first high-frequency low-voltage electrical energy or first high-frequency high-voltage electrical energy. Transformed second high-frequency electrical energy is obtained, comprising second high-frequency high-voltage electrical energy or second high-frequency low-voltage electrical energy. Second low-frequency electrical energy is obtained, comprising second low-frequency high-voltage electrical energy or a second low-frequency low-voltage electrical energy. The low-frequency low-voltage electrical energy, the first high-frequency low-voltage electrical energy, and the second high-frequency high-voltage electrical energy correspond to the second low-frequency high-voltage electrical energy. The low-frequency high-voltage electrical energy, the first high-frequency high-voltage electrical energy, and the second high-frequency low-voltage electrical energy correspond to the second low-frequency low-voltage electrical energy. According to the present invention, the transmission efficiency of low-frequency electrical energy during transmission is improved, high-frequency transfer of electrical energy during voltage transformation is achieved, and the iron core cross-sectional area of a transformer during transfer is reduced.

Description

A frequency conversion and voltage conversion system, method and device for wind power

[0001] This application claims priority to the Chinese patent application filed with the Patent Office of China on January 11, 2024, with application number 2024100451635 and invention name “A frequency conversion and voltage conversion system, method and equipment for wind power”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present invention relates to the technical field of transformers, and in particular to a frequency conversion and voltage conversion system, method and equipment for wind power. Background Art

[0003] In the existing technology, the frequency of electricity generated by wind turbines is generally lower than the industrial frequency and the voltage is relatively low. During the long-distance transmission of electricity, the voltage of the electricity generated by the wind turbine needs to be increased through a transformer. Low-frequency electricity will increase the cross-sectional area of ​​the transformer's core and use more metal core materials, thereby causing waste of energy and resources. Moreover, the larger the core, the greater the cost, weight and volume of the transformer, which is not conducive to production and product transportation, resulting in increased costs.

[0004] Summary of the Invention

[0005] The purpose of the embodiments of the present invention is to provide a frequency conversion and voltage conversion system, method and equipment to increase the transmission frequency of low-frequency electric energy during the voltage conversion process, realize high-frequency transmission of electric energy during the voltage conversion process, reduce the iron core cross-sectional area of ​​the transformer during the transmission process, and reduce the production cost of the voltage conversion system.

[0006] To achieve the above objectives, the present invention provides the following solutions:

[0007] A variable frequency and voltage conversion system, comprising:

[0008] An electric energy input module, configured to input low-frequency electric energy lower than a first preset frequency threshold; the low-frequency electric energy includes: low-frequency low-voltage electric energy or low-frequency high-voltage electric energy;

[0009] A first frequency conversion module, connected to the power input module, for performing frequency conversion processing on the low-frequency power to obtain high-frequency power higher than a second preset frequency threshold; the high-frequency power includes: first high-frequency low-voltage power or first high-frequency high-voltage power;

[0010] a transformer connected to the first frequency conversion module, configured to transform the high-frequency electric energy to obtain transformed second high-frequency electric energy; the second high-frequency electric energy includes: second high-frequency high-voltage electric energy or second high-frequency low-voltage electric energy;

[0011] a second frequency conversion module, connected to the transformer, for further frequency-converting the transformed high-frequency electric energy to obtain a second low-frequency electric energy within a preset frequency threshold range; the second low-frequency electric energy includes: a second low-frequency high-voltage electric energy or a second low-frequency low-voltage electric energy; the second low-frequency high-voltage electric energy is used for long-distance transmission; the second low-frequency electric energy is used to drive electric terminals for production and daily life;

[0012] an electric energy output module, connected to the second frequency conversion module, and configured to output the second low-frequency electric energy;

[0013] The low-frequency and low-voltage electric energy, the first high-frequency and low-voltage electric energy, the second high-frequency and high-voltage electric energy and the second low-frequency and high-voltage electric energy correspond to each other;

[0014] The low-frequency and high-voltage electric energy, the first high-frequency and high-voltage electric energy, the second high-frequency and low-voltage electric energy and the second low-frequency and low-voltage electric energy correspond to each other.

[0015] Optionally, the frequency values ​​of the high-frequency electric energy and the second high-frequency electric energy are linearly related to the cross-sectional area of ​​the iron core of the transformer.

[0016] Optionally, the linear relationship specifically includes:

[0017] When the voltage value of the high-frequency electric energy before or after the transformation remains unchanged, the frequency value of the high-frequency electric energy is inversely proportional to the cross-sectional area of ​​the transformer core;

[0018] The greater the frequency value of the high-frequency electric energy, the smaller the cross-sectional area of ​​the transformer core;

[0019] The smaller the frequency value of the high-frequency electric energy is, the larger the cross-sectional area of ​​the transformer core is.

[0020] Optionally, when the voltage value of the high-frequency electric energy before or after transformation remains unchanged, the frequency value of the high-frequency electric energy is inversely proportional to the cross-sectional area of ​​the transformer core, and the specific calculation formula is:

[0021] U∝fS;

[0022] Among them, U is the high-frequency voltage value; f is the frequency value of high-frequency electric energy; N is the number of coil turns; is the magnetic flux intensity; B is the magnetic induction intensity; S is the cross-sectional area of ​​the transformer core.

[0023] A frequency conversion and voltage conversion method, comprising:

[0024] Inputting low-frequency electric energy lower than a first preset frequency threshold; the low-frequency electric energy includes: low-frequency low-voltage electric energy or low-frequency high-voltage electric energy;

[0025] The low-frequency electric energy is subjected to frequency conversion processing to obtain high-frequency electric energy higher than a second preset frequency threshold; the high-frequency electric energy includes: first high-frequency low-voltage electric energy or first high-frequency high-voltage electric energy;

[0026] Transforming the high-frequency electric energy to obtain transformed second high-frequency electric energy; the second high-frequency electric energy includes: second high-frequency high-voltage electric energy or second high-frequency low-voltage electric energy;

[0027] The transformed high-frequency electric energy is subjected to frequency conversion processing again to obtain a second low-frequency electric energy within a preset frequency threshold range; the second low-frequency electric energy includes: a second low-frequency high-voltage electric energy or a second low-frequency low-voltage electric energy; the second low-frequency high-voltage electric energy is used for long-distance transmission; the second low-frequency low-voltage electric energy is used to drive electric terminals for production and life;

[0028] outputting the second low-frequency electric energy;

[0029] The low-frequency and low-voltage electric energy, the first high-frequency and low-voltage electric energy, the second high-frequency and high-voltage electric energy and the second low-frequency and high-voltage electric energy correspond to each other;

[0030] The low-frequency and high-voltage electric energy, the first high-frequency and high-voltage electric energy, the second high-frequency and low-voltage electric energy and the second low-frequency and low-voltage electric energy correspond to each other.

[0031] Optionally, the frequency values ​​of the high-frequency electric energy and the second high-frequency electric energy are linearly related to the cross-sectional area of ​​the iron core of the transformer.

[0032] Optionally, the linear relationship specifically includes:

[0033] When the voltage value of the high-frequency electric energy before or after the transformation remains unchanged, the frequency value of the high-frequency electric energy is inversely proportional to the cross-sectional area of ​​the transformer core;

[0034] The greater the frequency value of the high-frequency electric energy, the smaller the cross-sectional area of ​​the transformer core;

[0035] The smaller the frequency value of the high-frequency electric energy is, the larger the cross-sectional area of ​​the transformer core is.

[0036] Optionally, when the voltage value of the high-frequency electric energy before or after transformation remains unchanged, the frequency value of the high-frequency electric energy is inversely proportional to the cross-sectional area of ​​the transformer core, and the specific calculation formula is:

[0037] U∝fS;

[0038] Among them, U is the high-frequency voltage value; f is the frequency value of high-frequency electric energy; N is the number of coil turns; is the magnetic flux intensity; B is the magnetic induction intensity; S is the cross-sectional area of ​​the transformer core.

[0039] An electronic device comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the frequency conversion and voltage conversion method is implemented when the processor executes the computer program.

[0040] A non-transitory computer-readable storage medium stores a computer program, which implements the frequency conversion and voltage conversion method when executed.

[0041] In an embodiment of the present invention, an electric energy input module inputs low-frequency electric energy lower than a first preset frequency threshold; a first frequency conversion module is connected to the electric energy input module and is used to perform frequency conversion processing on the low-frequency electric energy to obtain high-frequency electric energy higher than a second preset frequency threshold; a transformer is connected to the first frequency conversion module and is used to perform voltage conversion processing on the high-frequency electric energy to obtain transformed high-frequency electric energy; a second frequency conversion module is connected to the transformer and is used to perform frequency conversion processing on the transformed high-frequency electric energy again to obtain low-frequency electric energy within a preset frequency threshold range; and an electric energy output module is connected to the second frequency conversion module and is used to output low-frequency electric energy. The present invention increases the transmission frequency of low-frequency electric energy during the voltage conversion process, realizes high-frequency transmission of electric energy during the voltage conversion process, reduces the iron core cross-sectional area of ​​the transformer during the transmission process, and reduces the production cost of the voltage conversion system.

[0042] Figures in the specification

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0044] FIG1 is a schematic structural diagram of a frequency conversion and voltage conversion system according to an embodiment of the present invention;

[0045] FIG2 is a detailed structural diagram of a frequency conversion and voltage conversion system provided by an embodiment of the present invention;

[0046] FIG3 is a schematic diagram of a transformer principle according to an embodiment of the present invention;

[0047] FIG4 is a schematic diagram of the specific structure of a transformer provided in an embodiment of the present invention;

[0048] FIG5 is a flow chart of a frequency conversion and voltage conversion method according to an embodiment of the present invention.

[0049] Explanation of symbols:

[0050] Power input module-100, first frequency conversion module-200, transformer-300, second frequency conversion module-400, power output module-500. DETAILED DESCRIPTION

[0051] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0052] The purpose of the present invention is to provide a frequency conversion and voltage conversion system, method and equipment to solve the problems of existing transformers, such as high cost, weight and volume, which are unfavorable for production and product transportation, and high cost.

[0053] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0054] Figure 1 shows an exemplary structure of the aforementioned variable frequency and voltage conversion system. The following describes each module in detail.

[0055] The power input module 100 is used to input low-frequency power lower than a first preset frequency threshold; the low-frequency power includes: low-frequency low-voltage power or low-frequency high-voltage power.

[0056] In one example, the power input module 100 may be a power transmission line of a wind farm. The first preset frequency threshold may be 20 Hz, 25 Hz, 30 Hz, etc., which will not be described in detail here.

[0057] The first frequency conversion module 200 is connected to the power input module 100, and the first frequency conversion module 200 is used to perform frequency conversion processing on the low-frequency power to obtain high-frequency power higher than the second preset frequency threshold; the high-frequency power includes: first high-frequency low-voltage power or first high-frequency high-voltage power.

[0058] In one example, referring to FIG2 , the first frequency conversion module 200 may specifically be a frequency converter, which converts 20 Hz low-frequency electrical energy into 100 Hz high-frequency electrical energy. The second preset frequency threshold may be 80 Hz, 85 Hz, 90 Hz, etc., which will not be elaborated here.

[0059] The transformer 300 is connected to the first frequency conversion module 200 and is used to transform the high-frequency electric energy to obtain the transformed second high-frequency electric energy; the second high-frequency electric energy includes: second high-frequency high-voltage electric energy or second high-frequency low-voltage electric energy.

[0060] In one example, referring to Figures 3 and 4, an embodiment of the present invention proposes a low-frequency transformer, including: a high-voltage inverter 1, a low-voltage inverter 2, a high-voltage connecting cable 3, a low-voltage side-connecting cable 4, a high-voltage insulator 5, a low-voltage insulator 6, a transformer high-voltage winding 7, a transformer low-voltage winding 8, a transformer core 9, and an axial flow fan 10.

[0061] The second frequency conversion module 400 is connected to the transformer 300. The second frequency conversion module 400 is used to perform frequency conversion processing on the transformed high-frequency electric energy again to obtain a second low-frequency electric energy within a preset frequency threshold range; the second low-frequency electric energy includes: a second low-frequency high-voltage electric energy or a second low-frequency low-voltage electric energy; the second low-frequency high-voltage electric energy is used for long-distance transmission; the second low-frequency low-voltage electric energy is used to drive power terminals for production and life.

[0062] In one example, referring to FIG2 , the second frequency conversion module 400 may be a frequency converter, which converts 100 Hz high-frequency electrical energy into 50 Hz industrial frequency electrical energy. The preset frequency threshold range may be 49.8 Hz-50.2 Hz, etc., which will not be elaborated here.

[0063] The frequency values ​​of the high-frequency electric energy and the second high-frequency electric energy are linearly related to the cross-sectional area of ​​the iron core of the transformer.

[0064] The linear relationship specifically includes:

[0065] When the voltage value of the high-frequency electric energy before or after the transformation remains unchanged, the frequency value of the high-frequency electric energy is inversely proportional to the cross-sectional area of ​​the transformer core.

[0066] The greater the frequency value of the high-frequency electric energy, the smaller the cross-sectional area of ​​the transformer core.

[0067] The smaller the frequency value of the high-frequency electric energy is, the larger the cross-sectional area of ​​the transformer core is.

[0068] When the voltage value of the high-frequency electric energy before or after transformation remains unchanged, the frequency value of the high-frequency electric energy is inversely proportional to the cross-sectional area of ​​the transformer core. The specific calculation formula is:

[0069] Among them, U is the high-frequency voltage value; f is the frequency value of high-frequency electric energy; N is the number of coil turns; is the magnetic flux intensity; B is the magnetic induction intensity; S is the cross-sectional area of ​​the transformer core.

[0070] In one example, when the frequency f is 20 Hz and the voltage value is 10 kV, the cross-sectional area of ​​the core is 50 / 20=2.5, that is, the cross-sectional area of ​​the core is 2.5 times that of the core of a normal power frequency transformer.

[0071] In another example, when the frequency f is 100 Hz and the voltage value is 10 kV, the cross-sectional area of ​​the core is 50 / 100=0.5, that is, the cross-sectional area of ​​the core is 0.5 times the cross-sectional area of ​​the core of a normal power frequency transformer.

[0072] It can be seen that as the frequency increases by 1 times, the cross-sectional area of ​​the core decreases by 1 / 2.

[0073] The power output module 500 is connected to the second frequency conversion module 400 , and the power output module 500 is used to output the second low-frequency power.

[0074] The low-frequency and low-voltage electric energy, the first high-frequency and low-voltage electric energy, the second high-frequency and high-voltage electric energy correspond to the second low-frequency and high-voltage electric energy.

[0075] The low-frequency and high-voltage electric energy, the first high-frequency and high-voltage electric energy, the second high-frequency and low-voltage electric energy and the second low-frequency and low-voltage electric energy correspond to each other.

[0076] In one example, the power output module 500 may specifically be a power transmission line of a power grid.

[0077] In summary, in an embodiment of the present invention, the electric energy input module inputs low-frequency electric energy lower than a first preset frequency threshold; the first frequency conversion module is connected to the electric energy input module, and is used to perform frequency conversion processing on the low-frequency electric energy to obtain high-frequency electric energy higher than a second preset frequency threshold; the transformer is connected to the first frequency conversion module, and is used to perform voltage conversion processing on the high-frequency electric energy to obtain transformed high-frequency electric energy; the second frequency conversion module is connected to the transformer, and is used to perform frequency conversion processing on the transformed high-frequency electric energy again to obtain low-frequency electric energy within the preset frequency threshold range; the electric energy output module is connected to the second frequency conversion module, and is used to output low-frequency electric energy. The present invention improves the transmission frequency of low-frequency electric energy during the voltage conversion process, realizes high-frequency transmission of electric energy during the voltage conversion process, reduces the iron core cross-sectional area of ​​the transformer during the transmission process, and reduces the production cost of the voltage conversion system.

[0078] To achieve the above objectives, the present invention further provides the following solutions:

[0079] A frequency conversion and voltage conversion method, as shown in FIG5 , includes:

[0080] Step S1: inputting low-frequency electric energy lower than a first preset frequency threshold; the low-frequency electric energy includes: low-frequency low-voltage electric energy or low-frequency high-voltage electric energy.

[0081] Step S2: performing frequency conversion processing on the low-frequency electric energy to obtain high-frequency electric energy higher than a second preset frequency threshold; the high-frequency electric energy includes: first high-frequency low-voltage electric energy or first high-frequency high-voltage electric energy.

[0082] Step S3: transforming the high-frequency electric energy to obtain transformed second high-frequency electric energy; the second high-frequency electric energy includes: second high-frequency high-voltage electric energy or second high-frequency low-voltage electric energy.

[0083] Step S4: The transformed high-frequency electric energy is frequency-converted again to obtain a second low-frequency electric energy within a preset frequency threshold range; the second low-frequency electric energy includes: a second low-frequency high-voltage electric energy or a second low-frequency low-voltage electric energy; the second low-frequency high-voltage electric energy is used for long-distance transmission; the second low-frequency low-voltage electric energy is used to drive power terminals for production and life.

[0084] Step S5: outputting the second low-frequency electric energy.

[0085] The low-frequency and low-voltage electric energy, the first high-frequency and low-voltage electric energy, the second high-frequency and high-voltage electric energy correspond to the second low-frequency and high-voltage electric energy.

[0086] The low-frequency and high-voltage electric energy, the first high-frequency and high-voltage electric energy, the second high-frequency and low-voltage electric energy and the second low-frequency and low-voltage electric energy correspond to each other.

[0087] Furthermore, the present invention provides an electronic device, which may include: a processor, a communication interface, a memory, and a communication bus. The processor, the communication interface, and the memory communicate with each other via the communication bus. The processor may invoke a computer program in the memory to implement the frequency conversion and voltage conversion method for wind power when the processor executes the computer program.

[0088] In addition, when the computer program in the above-mentioned memory is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory, a random access memory, a magnetic disk or an optical disk.

[0089] Furthermore, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, and when the computer program is executed, the frequency conversion and voltage conversion method for wind power energy is implemented.

[0090] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the systems disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0091] This document uses specific examples to illustrate the principles and implementation methods of the embodiments of the present invention. The description of the above embodiments is only intended to help understand the methods and core concepts of the embodiments of the present invention. At the same time, for those skilled in the art, based on the concepts of the embodiments of the present invention, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the embodiments of the present invention.

Claims

1. A variable frequency and variable voltage system, characterized in that, Including: An electric energy input module for inputting low-frequency electric energy below a first preset frequency threshold; The low-frequency electric energy includes: low-frequency low-voltage electric energy or low-frequency high-voltage electric energy; A first frequency conversion module connected to the electric energy input module for performing frequency conversion processing on the low-frequency electric energy to obtain high-frequency electric energy above a second preset frequency threshold; the high-frequency electric energy includes: first high-frequency low-voltage electric energy or first high-frequency high-voltage electric energy; A transformer connected to the first frequency conversion module for performing voltage conversion processing on the high-frequency electric energy to obtain a second high-frequency electric energy after voltage conversion; the second high-frequency electric energy includes: second high-frequency high-voltage electric energy or second high-frequency low-voltage electric energy; A second frequency conversion module connected to the transformer for performing frequency conversion processing on the high-frequency electric energy after voltage conversion again to obtain a second low-frequency electric energy within a preset frequency threshold range; the second low-frequency electric energy includes: second low-frequency high-voltage electric energy or second low-frequency low-voltage electric energy; the second low-frequency high-voltage electric energy is used for long-distance transmission; the second low-frequency low-voltage electric energy is used to drive an electrical terminal for production and life; An electric energy output module connected to the second frequency conversion module for outputting the second low-frequency electric energy; The low-frequency low-voltage electric energy, the first high-frequency low-voltage electric energy, the second high-frequency high-voltage electric energy and the second low-frequency high-voltage electric energy correspond to each other; The low-frequency high-voltage electric energy, the first high-frequency high-voltage electric energy, the second high-frequency low-voltage electric energy and the second low-frequency low-voltage electric energy correspond to each other.

2. The variable frequency and variable voltage system according to claim 1, wherein The frequency values of the high-frequency electric energy and the second high-frequency electric energy are linearly related to the cross-sectional area of the iron core of the transformer.

3. The variable frequency and variable voltage system according to claim 2, characterized in that, The specific linear relationship includes: When the voltage value of the high-frequency electric energy before or after voltage conversion remains unchanged, the frequency value of the high-frequency electric energy is inversely proportional to the cross-sectional area of the transformer iron core; The larger the frequency value of the high-frequency electric energy, the smaller the cross-sectional area of the transformer iron core; The smaller the frequency value of the high-frequency electric energy, the larger the cross-sectional area of the transformer iron core.

4. The variable frequency and variable voltage system according to claim 3, characterized in that, When the voltage value of the high-frequency electric energy before or after voltage transformation remains unchanged, the frequency value of the high-frequency electric energy is inversely proportional to the cross-sectional area of the transformer core, and the specific calculation formula is: U∝fS; Among them, U is the high-frequency voltage value; f is the frequency value of the high-frequency electric energy; N is the number of turns of the coil; is the magnetic flux density; B is the magnetic induction intensity; S is the cross-sectional area of the transformer iron core.

5. A variable frequency and variable voltage method, characterized in that, Including: Inputting low-frequency electric energy below a first preset frequency threshold; The low-frequency electric energy includes: low-frequency low-voltage electric energy or low-frequency high-voltage electric energy; Performing frequency conversion processing on the low-frequency electric energy to obtain high-frequency electric energy above a second preset frequency threshold; the high-frequency electric energy includes: first high-frequency low-voltage electric energy or first high-frequency high-voltage electric energy; Performing voltage conversion processing on the high-frequency electric energy to obtain a second high-frequency electric energy after voltage conversion; the second high-frequency electric energy includes: second high-frequency high-voltage electric energy or second high-frequency low-voltage electric energy; Performing frequency conversion processing on the high-frequency electric energy after voltage conversion again to obtain a second low-frequency electric energy within a preset frequency threshold range; the second low-frequency electric energy includes: second low-frequency high-voltage electric energy or second low-frequency low-voltage electric energy; the second low-frequency high-voltage electric energy is used for long-distance transmission; the second low-frequency low-voltage electric energy is used to drive an electrical terminal for production and life; Outputting the second low-frequency electric energy; The low-frequency low-voltage electric energy, the first high-frequency low-voltage electric energy, the second high-frequency high-voltage electric energy and the second low-frequency high-voltage electric energy correspond to each other; The low-frequency high-voltage electric energy, the first high-frequency high-voltage electric energy, the second high-frequency low-voltage electric energy, and the second low-frequency low-voltage electric energy correspond to each other.

6. The variable frequency and variable voltage method according to claim 5, characterized in that The frequency values of the high-frequency electric energy and the second high-frequency electric energy have a linear relationship with the cross-sectional area of the iron core of the transformer.

7. The variable frequency and variable voltage method according to claim 6, characterized in that, The specific linear relationship includes: When the voltage value of the high-frequency electric energy before or after voltage transformation remains unchanged, the frequency value of the high-frequency electric energy and the cross-sectional area of the transformer iron core are in an inverse proportion relationship; The larger the frequency value of the high-frequency electric energy, the smaller the cross-sectional area of the transformer iron core; The smaller the frequency value of the high-frequency electric energy, the larger the cross-sectional area of the transformer iron core.

8. The variable frequency and variable voltage method according to claim 7, wherein When the voltage value of the high-frequency electric energy before or after transformation remains unchanged, the frequency value of the high-frequency electric energy is inversely proportional to the cross-sectional area of the transformer core, and the specific calculation formula is: U∝fS; Among them, U is the high-frequency voltage value; f is the frequency value of the high-frequency electric energy; N is the number of turns of the coil; is the magnetic flux intensity; B is the magnetic induction intensity; S is the cross-sectional area of the transformer iron core.

9. An electronic device, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the frequency conversion and voltage transformation method described in claims 5-8.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed, it implements the frequency conversion and voltage transformation method described in claims 5-8.

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