Method for simulating adjacent electromagnetic environment of multi-circuit direct current transmission line based on CDEGS

Abstract

A CDEGS-based method for simulating an adjacent electromagnetic environment of a multi-loop direct-current transmission line comprises the following steps: acquiring parameters for constructing a multi-loop direct-current transmission line model, and constructing a multi-loop direct-current transmission line model according to the model parameters; according to the operation environment of each line in the multi-loop DC power transmission line, setting operation parameters of the multi-loop DC power transmission line; setting electric field, magnetic field and space charge parameters of the multi-loop direct current transmission line to be measured, and setting an observation line; selecting a multi-loop power transmission line phase line needing to be evaluated, and determining calculation methods of audio noise, radio frequency interference, corona loss and atmospheric conditions; and according to the set parameters and the selected calculation method, CDEGS simulation is adopted to obtain an electromagnetic environment result adjacent to the multi-loop direct current transmission line. According to the method, influences of wire parameters, operation parameters, electromagnetic coupling and the atmospheric environment on electromagnetic calculation are considered at the same time, and rapid calculation of electromagnetic environment indexes such as a surface electric field, a ground synthetic electromagnetic field, audible noise and radio interference is accurately achieved.

Description

Technical Field

[0001] The invention relates to the technical field of electromagnetic environment simulation near multiple DC transmission lines, and in particular to a method for simulating the electromagnetic environment near multiple DC transmission lines based on CDEGS. Background Art

[0002] In economically developed and densely populated areas, it is extremely difficult to open up new transmission channels, and the land acquisition costs for transmission corridors are far higher than the cost of the transmission lines themselves. In order to meet the growing load demand, it is necessary to transform the transmission lines from AC to DC and expand the capacity to form multi-circuit DC lines on the basis of the existing AC transmission grid, and build a system grid with the system positioning of "embedded" DC new power system and the functional positioning of "extended back-to-back". However, the research on the electromagnetic environmental impact of overhead multi-circuit DC transmission lines on the same tower is still blank in China, and there are no ready-made regulations and engineering experience to refer to in engineering design. In order to improve the relevant design technical standards and meet the planning and design needs of multi-circuit DC transmission lines, it is urgent to carry out research on the electromagnetic environmental impact protection of multi-circuit DC transmission lines on the same tower to solve the key problems of engineering design. Summary of the invention

[0003] In view of the above problems, the present invention is proposed to provide a method for simulating the electromagnetic environment near multiple DC transmission lines based on CDEGS, which overcomes the above problems or at least partially solves the above problems.

[0004] In order to solve the above technical problems, the embodiments of the present application disclose the following technical solutions:

[0005] In a first aspect, an embodiment of the present invention discloses a method for simulating an electromagnetic environment adjacent to a multi-circuit DC transmission line based on CDEGS, comprising:

[0006] S100. Acquire parameters for constructing a multi-circuit DC transmission line model, and construct a multi-circuit DC transmission line model according to the model parameters; the model parameters at least include transmission line parameters, neutral line parameters, tower structure and earth soil characteristics;

[0007] S200. According to the operating environment of each line in the multiple DC transmission lines, the operating parameters of the multiple DC transmission lines are set; the operating parameters of the multiple DC transmission lines include at least the voltage form, voltage angle, current value, current angle and starting corona potential gradient of the multiple DC transmission lines;

[0008] S300. Set the electric field, magnetic field and space charge parameters of multiple DC transmission lines to be measured, and set the observation line;

[0009] S400. Select the phase lines of multiple power transmission lines that need to be evaluated, and determine the calculation methods of audio noise, radio frequency interference, corona loss, and atmospheric conditions;

[0010] S500. According to the operating parameters of the multi-circuit DC transmission lines, the electric field, magnetic field, space charge parameters and observation lines of the multi-circuit DC transmission lines, the calculation method of the audio noise, radio frequency interference, corona loss and atmospheric conditions is adopted, and the CDEGS simulation is used to simulate the multi-circuit DC transmission line model to obtain the electromagnetic environment results near the multi-circuit DC transmission lines.

[0011] Furthermore, in S100, the transmission line parameters include at least the material name of the AC and DC transmission lines, the number of wire bundles, the wire bundle radius, the wire bundle arrangement starting angle, the wire bundle conductor radius, the phase conductor characteristics, the wire bundle splitting characteristics, the local circuit commutation state, the phase line number and the relative coordinates.

[0012] Furthermore, in S100, the tower structure package at least includes the height of the tower above the ground, the distance between the conductors of the AC and DC transmission lines, the coordinates of the conductor arrangement position, and the length of the suspension insulator.

[0013] Furthermore, in S100, the earth soil characteristics at least include uniform soil resistivity, soil thickness, relative magnetic permeability and relative dielectric constant.

[0014] Further, in S200, the voltage form includes phase voltage and line voltage.

[0015] Furthermore, in S300, the space charge parameters include at least positive ion mobility, negative ion mobility, load coefficient and voltage or potential gradient of starting corona; the observation line includes at least the number of observation points, Y starting coordinate, Z starting point coordinate, Z starting point coordinate and Z end point coordinate.

[0016] Further, in S400, the audio noise calculation method includes a first semi-empirical calculation formula and a first empirical calculation formula; wherein, the first semi-empirical calculation formula includes at least IREQ, EPRI, and IREQ-SI calculation formulas, and the first empirical calculation formula includes at least IREQ-E, GE-E, BPA-E, EdF-E, ENEL-E, FGH-E, BPA-DC-E, and EPRI-DC-E calculation formulas.

[0017] Further, in S400, the radio frequency interference calculation method includes a second semi-empirical calculation formula and a second empirical calculation formula; wherein, the second semi-empirical calculation formula includes at least IREQ, EdF, and CIGRE calculation formulas, and the second empirical calculation formula includes at least IREQ-E, CIGRE-E, BPA-E, FGH-E, CRIEPI-E, and ENEL-E calculation formulas.

[0018] Furthermore, in S500, the electromagnetic environment results near the multi-circuit DC transmission lines at least include the surface electric field of the conductors, the ground synthetic electromagnetic field and ion current density, audible noise and radio interference.

[0019] In a second aspect, an embodiment of the present invention discloses an electronic device, including:

[0020] one or more processors;

[0021] A memory for storing one or more programs;

[0022] When the one or more programs are executed by the one or more processors, the one or more processors implement the electromagnetic environment simulation method.

[0023] The beneficial effects of the above technical solution provided by the embodiment of the present invention include at least:

[0024] The invention discloses a method for simulating the electromagnetic environment near a multi-circuit DC transmission line based on CDEGS, comprising: obtaining parameters for constructing a model of the multi-circuit DC transmission line, and constructing the model of the multi-circuit DC transmission line according to the model parameters; setting the operating parameters of the multi-circuit DC transmission line according to the operating environment of each line in the multi-circuit DC transmission line; setting the electric field, magnetic field, and space charge parameters of the multi-circuit DC transmission line to be measured, and setting an observation line; selecting the phase line of the multi-circuit DC transmission line to be evaluated, and determining the calculation method of audio noise, radio frequency interference, corona loss, and atmospheric conditions; according to the operating parameters of the multi-circuit DC transmission line, the electric field, magnetic field, and space charge parameters of the multi-circuit DC transmission line and the observation line, using the calculation method of audio noise, radio frequency interference, corona loss, and atmospheric conditions, using CDEGS to simulate the multi-circuit DC transmission line model to obtain the electromagnetic environment result near the multi-circuit DC transmission line. The method disclosed in the present invention is constructed according to the line arrangement position of multiple DC transmission lines under the actual operating environment, and can simultaneously consider the influence of conductor parameters, operating parameters, electromagnetic coupling and atmospheric environment on electromagnetic calculation, and can accurately realize the rapid calculation of electromagnetic environment indicators such as surface electric field, ground synthetic electromagnetic field, audible noise and radio interference. The model parameters of the present invention can be quickly obtained through measurements in actual engineering, which is more practical than the analytical method, and there is no need to calculate the mutual conductance parameters between the multiple DC transmission lines.

[0025] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 This is a flow chart of a method for simulating the electromagnetic environment near multiple DC transmission lines based on CDEGS in Example 1 of the present invention;

[0028] Figure 2 This is a schematic diagram of the steps of a method for simulating the electromagnetic environment near multiple DC transmission lines based on CDEGS in Example 1 of the present invention;

[0029] Figure 3 The relative arrangement position of the ±200kV three-circuit DC line calculation example in Example 1 of the present invention;

[0030] Figure 4 The phase line voltage of the ±200kV three-circuit DC line calculation example in Example 1 of the present invention;

[0031] Figure 5 The ground synthetic electromagnetic field of the ±200kV three-circuit DC line example in Example 1 of the present invention;

[0032] Figure 6 The audible noise result of the ±200kV three-circuit DC line calculation example in Example 1 of the present invention;

[0033] Figure 7 The radio interference result of the ±200kV three-circuit DC line calculation example in Example 1 of the present invention;

[0034] Figure 8 This is a schematic diagram of the structure of an electronic device in Embodiment 2 of the present invention. DETAILED DESCRIPTION

[0035] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0036] In order to solve the problems existing in the prior art, an embodiment of the present invention provides a method for simulating the electromagnetic environment near multiple DC transmission lines based on CDEGS.

[0037] Example 1

[0038] The present invention discloses a method for simulating the electromagnetic environment of multiple DC transmission lines based on CDEGS. Figure 1 and Figure 2 ,include:

[0039] S100. Acquire parameters for constructing a multi-circuit DC transmission line model, and construct a multi-circuit DC transmission line model according to the model parameters; the model parameters at least include transmission line parameters, neutral line parameters, tower structure and earth soil characteristics;

[0040] The transmission line parameters at least include the material name, number of wire bundles, wire bundle radius, wire bundle arrangement starting angle, wire bundle conductor radius, phase conductor characteristics, wire bundle splitting characteristics, local circuit commutation state, phase line number and relative coordinates of the AC and DC transmission lines. The phase conductor characteristics include the conductor name, cross section, conductor outer diameter and conductor impedance parameters of the AC and DC transmission lines.

[0041] In S100 of this embodiment, the tower structure includes the height of the tower above the ground, the conductor spacing between the AC and DC transmission lines, the conductor arrangement position coordinates and the length of the suspension insulator. The earth soil characteristics at least include uniform soil resistivity, soil thickness, relative magnetic permeability and relative dielectric constant.

[0042] Specifically, this embodiment uses a ±200kV three-circuit DC line as an example for calculation analysis. The transmission line and neutral line parameters of the three-circuit transmission line are the same: the material names are C1, C2, and C3 to distinguish the three lines, the number of wire bundles is 4; the wire bundle radius is 0.5m; the starting angle of the wire bundle arrangement is 45°; the wire bundle conductor radius is 0.0168; the phase conductor characteristics are steel core aluminum alloy stranded wire (JLG1A); the wire bundle splitting characteristics are uniform; the local circuit commutation state is inherited commutation. The phase line numbers are S1, S2, S3, S4, S5, and S6; the neutral line numbers are N1 and N2; the tower height above the ground is 18m; the relative coordinates are arranged as follows: Figure 3 The relative arrangement of the ±200kV three-circuit DC line example is shown in Table 1. The specific parameter settings are shown in Table 1:

[0043] Table 1 Specific parameters of overhead transmission lines

[0044]

[0045]

[0046] Among them, the resistivity of the earth's soil is 100Ω / m, the thickness is infinite, the relative magnetic permeability is 1p.u., and the relative dielectric constant is 1p.u.

[0047] S200. According to the operating environment of each line in the multiple DC transmission lines, the operating parameters of the multiple DC transmission lines are set; the operating parameters of the multiple DC transmission lines include at least the voltage form, voltage angle, current value, current angle and starting corona potential gradient of the multiple DC transmission lines;

[0048] In S200 of this embodiment, the voltage form includes phase voltage and line voltage. Specifically, assume that the three phases of the ±200kV three-circuit DC line are all phase voltages, the voltage amplitude of one circuit is 200kV and -200kV respectively, the voltage angle is 0, the current value is 3000A DC current, and the current angle is 0. Figure 4 The phase line voltage situation of the ±200kV three-circuit DC line example is shown.

[0049] S300. Set the electric field, magnetic field and space charge parameters of multiple DC transmission lines that need to be measured, and set the observation line; in S300 of this embodiment, the space charge parameters include at least positive ion mobility, negative ion mobility, load factor and the voltage or potential gradient of the starting corona; the observation line includes at least the number of observation points, Y starting coordinate, Z starting point coordinate, Z starting point coordinate and Z end point coordinate.

[0050] Specifically, since 200 kV does not reach the corona inception voltage, there is no need to set the corona inception potential gradient, and the spatial positive ion mobility is 0.00013 m 2 / V·s, the negative ion mobility is 0.00017m 2 / V·s, the composite coefficient is 2.2E-12m 3 / s. The number of observation points of the observation line is 201, the Y starting point coordinate is -100, the Z starting point coordinate is 0, the Y end point coordinate is 100, and the Z end point coordinate is 0.

[0051] S400. Select multiple power transmission line phases to be evaluated, and determine the calculation methods for audio noise, radio frequency interference, corona loss, and atmospheric conditions; in S400 of this embodiment, the audio noise calculation method includes a first semi-empirical calculation formula and a first empirical calculation formula; wherein the first semi-empirical calculation formula includes at least IREQ, EPRI, and IREQ-SI calculation formulas, and the first empirical calculation formula includes at least IREQ-E, GE-E, BPA-E, EdF-E, ENEL-E, FGH-E, BPA-DC-E, and EPRI-DC-E calculation formulas. The radio frequency interference calculation method includes a second semi-empirical calculation formula and a second empirical calculation formula; wherein the second semi-empirical calculation formula includes at least IREQ, EdF, and CIGRE calculation formulas, and the second empirical calculation formula includes at least IREQ-E, CIGRE-E, BPA-E, FGH-E, CRIEPI-E, and ENEL-E calculation formulas. The corona loss calculation method includes IREQ, BPA, EdF, EPRI, etc. The atmospheric conditions include heavy rain, light rain, sunny day, light snow, moderate snow, heavy snow, and user-defined rain speed.

[0052] Specifically, the phase lines of the multi-circuit transmission lines to be evaluated in this embodiment select all circuits, the audio noise selects the BPA-DC-E algorithm, the radio frequency interference selects the BPA-DC-E algorithm, the AC phase line superposition method is implemented according to the CISPR standard, the DC pole superposition method is the RMS method, there is no corona loss, select None, and the atmospheric condition selects Sunny Day. The BPA-DC-E algorithm represents an empirical formula obtained by fitting the CISPR standard formula based on experimental data under 1MHz electromagnetic wave excitation conditions.

[0053] S500. According to the operating parameters of the multi-circuit DC transmission lines, the electric field, magnetic field, space charge parameters and observation lines of the multi-circuit DC transmission lines, the calculation method of the audio noise, radio frequency interference, corona loss and atmospheric conditions is adopted, and the CDEGS simulation is used to simulate the multi-circuit DC transmission line model to obtain the electromagnetic environment results near the multi-circuit DC transmission lines.

[0054] In S500 of this embodiment, the electromagnetic environment results near the multi-circuit DC transmission lines at least include the surface electric field of the conductors, the ground synthetic electromagnetic field and ion current density, audible noise and radio interference.

[0055] Among them, using the example given in this embodiment, the surface electric field results of the wire are shown in Table 2:

[0056] Table 2 Electromagnetic environment calculation results

[0057]

[0058] According to the method disclosed in this embodiment, the calculation results of the ground synthetic electromagnetic field are as follows: Figure 5 The audible noise results are shown in Figure 6 The radio interference results are shown as Figure 7 shown.

[0059] The present embodiment discloses a method for simulating the electromagnetic environment near a multi-circuit DC transmission line based on CDEGS, comprising: obtaining parameters for constructing a model of a multi-circuit DC transmission line, and constructing a model of the multi-circuit DC transmission line according to the model parameters; setting the operating parameters of the multi-circuit DC transmission line according to the operating environment of each line in the multi-circuit DC transmission line; setting the electric field, magnetic field, and space charge parameters of the multi-circuit DC transmission line to be measured, and setting an observation line; selecting the phase line of the multi-circuit DC transmission line to be evaluated, and determining the calculation method of audio noise, radio frequency interference, corona loss, and atmospheric conditions; according to the operating parameters of the multi-circuit DC transmission line, the electric field, magnetic field, space charge parameters of the multi-circuit DC transmission line and the observation line, using the calculation method of audio noise, radio frequency interference, corona loss, and atmospheric conditions, using CDEGS to simulate the multi-circuit DC transmission line model to obtain the electromagnetic environment result near the multi-circuit DC transmission line. The method disclosed in the present invention is constructed according to the line arrangement position of multiple DC transmission lines under the actual operating environment, and can simultaneously consider the influence of conductor parameters, operating parameters, electromagnetic coupling and atmospheric environment on electromagnetic calculation, and can accurately realize the rapid calculation of electromagnetic environment indicators such as surface electric field, ground synthetic electromagnetic field, audible noise and radio interference. The model parameters of the present invention can be quickly obtained through measurements in actual engineering, which is more practical than the analytical method, and there is no need to calculate the mutual conductance parameters between the multiple DC transmission lines.

[0060] Example 3

[0061] Based on the same inventive concept, an embodiment of the present disclosure also provides an electronic device. Figure 8 FIG. 1 is a schematic diagram of the structure of an electronic device according to an embodiment of the present disclosure. Figure 8 As shown, an embodiment of the present disclosure provides an electronic device including: one or more processors 101, a memory 102, and one or more I / O interfaces 103. The memory 102 stores one or more programs, and when the one or more programs are executed by the one or more processors, the one or more processors implement any optimization method in the above embodiments; the one or more I / O interfaces 103 are connected between the processor and the memory, and are configured to implement information interaction between the processor and the memory.

[0062] Among them, the processor 101 is a device with data processing capabilities, including but not limited to a central processing unit (CPU), etc.; the memory 102 is a device with data storage capabilities, including but not limited to random access memory (RAM, more specifically SDRAM, DDR, etc.), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory (FLASH); the I / O interface (read-write interface) 103 is connected between the processor 101 and the memory 102, and can realize information interaction between the processor 101 and the memory 102, including but not limited to a data bus (Bus), etc.

[0063] In some embodiments, the processor 101 , the memory 102 , and the I / O interface 103 are connected to each other via a bus 104 , and further connected to other components of the computing device.

[0064] In some embodiments, the one or more processors 101 include a field programmable gate array.

[0065] According to an embodiment of the present disclosure, a computer-readable medium is further provided, wherein a computer program is stored on the computer-readable medium, wherein when the program is executed by a processor, the steps in any optimization method in the above-mentioned embodiment are implemented.

[0066] It should be understood that the specific order or hierarchy of steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process can be rearranged without departing from the scope of protection of the present disclosure. The attached method claims present the elements of the various steps in an exemplary order and are not intended to be limited to the specific order or hierarchy described.

[0067] In the above detailed description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure should not be interpreted as reflecting an intention that the embodiments of the claimed subject matter require more features than are clearly stated in each claim. On the contrary, as reflected in the appended claims, the invention is in a state of having less than all the features of the disclosed individual embodiments. Therefore, the appended claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.

[0068] Those skilled in the art will also appreciate that the various illustrative logic blocks, modules, circuits, and algorithmic steps described in conjunction with the embodiments herein can all be implemented as electronic hardware, computer software, or a combination thereof. In order to clearly illustrate the interchangeability between hardware and software, various illustrative components, blocks, modules, circuits, and steps are generally described above around their functions. Whether such functions are implemented as hardware or software depends on specific applications and the design constraints imposed on the entire system. A skilled person can implement the described functions in an alternative manner for each specific application, but such implementation decisions should not be interpreted as departing from the scope of protection of the present disclosure.

[0069] The steps of the method or algorithm described in conjunction with the embodiments herein may be directly embodied as hardware, a software module executed by a processor, or a combination thereof. The software module may be located in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a mobile disk, a CD-ROM, or any other form of storage medium well known in the art. An exemplary storage medium is connected to the processor so that the processor can read information from the storage medium and can write information to the storage medium. Of course, the storage medium may also be an integral part of the processor. The processor and the storage medium may be located in an ASIC. The ASIC may be located in a user terminal. Of course, the processor and the storage medium may also be present in a user terminal as discrete components.

[0070] For software implementation, the techniques described in this application can be implemented with modules (e.g., procedures, functions, etc.) that perform the functions described in this application. These software codes can be stored in a memory unit and executed by a processor. The memory unit can be implemented within the processor or outside the processor. In the latter case, it is coupled to the processor in a communication manner via various means, which are well known in the art.

[0071] The above description includes examples of one or more embodiments. Of course, it is impossible to describe all possible combinations of components or methods for the purpose of describing the above embodiments, but it should be recognized by those skilled in the art that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to cover all such changes, modifications and variations that fall within the scope of protection of the appended claims. In addition, with respect to the term "comprising" used in the specification or claims, the word is covered in a manner similar to the term "including", just as "including," is explained as a transitional word in the claims. In addition, any term "or" used in the specification of the claims is intended to mean "non-exclusive or".

Claims

1. A method for simulating the electromagnetic environment near multiple DC transmission lines based on CDEGS, characterized in that: include: S100. Acquire parameters for constructing a multi-circuit DC transmission line model, and construct a multi-circuit DC transmission line model according to the model parameters; the model parameters at least include transmission line parameters, neutral line parameters, tower structure and earth soil characteristics; S200. According to the operating environment of each line in the multiple DC transmission lines, the operating parameters of the multiple DC transmission lines are set; the operating parameters of the multiple DC transmission lines include at least the voltage form, voltage angle, current value, current angle and starting corona potential gradient of the multiple DC transmission lines; S300. Set the electric field, magnetic field and space charge parameters of multiple DC transmission lines to be measured, and set the observation line; S400. Select the phase lines of multiple power transmission lines that need to be evaluated, and determine the calculation methods of audio noise, radio frequency interference, corona loss, and atmospheric conditions; S500. According to the operating parameters of the multi-circuit DC transmission lines, the electric field, magnetic field, space charge parameters and observation lines of the multi-circuit DC transmission lines, the calculation method of the audio noise, radio frequency interference, corona loss and atmospheric conditions is adopted, and the CDEGS simulation is used to simulate the multi-circuit DC transmission line model to obtain the electromagnetic environment results near the multi-circuit DC transmission lines.

2. The method for simulating the electromagnetic environment near multiple DC transmission lines based on CDEGS as claimed in claim 1, characterized in that: In S100, the transmission line parameters include at least the material name of the AC and DC transmission lines, the number of wire bundles, the wire bundle radius, the wire bundle arrangement starting angle, the wire bundle conductor radius, the phase conductor characteristics, the wire bundle splitting characteristics, the local circuit commutation state, the phase line number and the relative coordinates.

3. The method for simulating the electromagnetic environment near multiple DC transmission lines based on CDEGS as claimed in claim 1, characterized in that: In S100, the tower structure package at least includes the height of the tower above the ground, the distance between the conductors of the AC and DC transmission lines, the coordinates of the conductor arrangement position, and the length of the suspension insulator.

4. The method for simulating the electromagnetic environment near multiple DC transmission lines based on CDEGS as claimed in claim 1, characterized in that: In S100, the earth soil characteristics include at least uniform soil resistivity, soil thickness, relative magnetic permeability and relative dielectric constant.

5. The method for simulating the electromagnetic environment near multiple DC transmission lines based on CDEGS as claimed in claim 1, characterized in that: In S200, the voltage form includes phase voltage and line voltage.

6. The method for simulating the electromagnetic environment near multiple DC transmission lines based on CDEGS as claimed in claim 1, characterized in that: In S300, the space charge parameters include at least positive ion mobility, negative ion mobility, load coefficient and voltage or potential gradient of starting corona; the observation line includes at least the number of observation points, Y starting coordinate, Z starting point coordinate, Z starting point coordinate and Z end point coordinate.

7. The method for simulating the electromagnetic environment near multiple DC transmission lines based on CDEGS as claimed in claim 1, characterized in that: In S400, the audio noise calculation method includes a first semi-empirical calculation formula and a first empirical calculation formula; wherein, the first semi-empirical calculation formula includes at least IREQ, EPRI, and IREQ-SI calculation formulas, and the first empirical calculation formula includes at least IREQ-E, GE-E, BPA-E, EdF-E, ENEL-E, FGH-E, BPA-DC-E, and EPRI-DC-E calculation formulas.

8. The method for simulating the electromagnetic environment near multiple DC transmission lines based on CDEGS as claimed in claim 1, characterized in that: In S400, the radio frequency interference calculation method includes a second semi-empirical calculation formula and a second empirical calculation formula; wherein, the second semi-empirical calculation formula includes at least IREQ, EdF, and CIGRE calculation formulas, and the second empirical calculation formula includes at least IREQ-E, CIGRE-E, BPA-E, FGH-E, CRIEPI-E, and ENEL-E calculation formulas.

9. The method for simulating the electromagnetic environment near multiple DC transmission lines based on CDEGS as claimed in claim 1, characterized in that: In S500, the electromagnetic environment results near the multi-circuit DC transmission lines at least include the surface electric field of the conductors, the ground synthetic electromagnetic field and ion current density, audible noise and radio interference.

10. An electronic device comprising: one or more processors; A memory for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the method for simulating an electromagnetic environment in any one of claims 1 to 9.

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