CN109388867B - Method and device for evaluating electromagnetic radiation interference of high-voltage direct-current converter station - Google Patents
Method and device for evaluating electromagnetic radiation interference of high-voltage direct-current converter station Download PDFInfo
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Abstract
The invention discloses a method and a device for evaluating electromagnetic radiation interference of a high-voltage direct-current converter station, comprising the following steps: setting a preset model according to the soil conductivity parameters to obtain a dipole radiation calculation model considering the ground factors; the soil conductivity parameters are soil area conductivity and soil area dielectric constant; the electromagnetic radiation attenuation characteristic is simulated and calculated by adopting the dipole radiation calculation model considering the ground factor, the radio interference limit value and the corresponding protection range are determined, and the problem that the free space dipole model does not consider the influence of the ground on the radiation attenuation to cause errors in the calculation of the electromagnetic radiation interference and the protection range in the prior art can be effectively solved, the influence of the electromagnetic radiation interference of the converter station can be effectively reduced, and an effective method is provided for researching the calculation of the electromagnetic radiation attenuation characteristic.
Description
Technical Field
The invention relates to the technical field of direct current transmission, in particular to a method and a device for evaluating electromagnetic radiation interference of a high-voltage direct current converter station.
Background
With the development of high-power electronic devices and flexible control capability, the direct-current transmission technology is widely applied to long-distance high-capacity power transmission and new energy access. Because of the rapid switching-off characteristic of the thyristor device, the electromagnetic radiation characteristic and the limit value requirement of the HVDC converter station are obviously different from those of the traditional AC transmission.
The electromagnetic radiation frequency range of the direct current converter station is wider than that of the alternating current transformer station. Electromagnetic radiation interference from ac high voltage power equipment or facilities comes primarily from corona. The prior art covers more fully the research in this respect, in particular the CISPR 18 series standard promulgated by the IEC electromagnetic compatibility Committee. The series of standard systems provide limit requirements and measurement procedures of electromagnetic fields around a transformer substation, and according to the frequency spectrum characteristics of electromagnetic radiation generated by alternating current equipment or line corona, 0.5MHz is used as a reference frequency to measure the radio interference level. For high voltage converter stations, it is not sufficient to evaluate radio interference at a single frequency point due to the on-characteristics of the high power converter, and the entire frequency range (typically 0.15 MHz-30 MHz) that may be affected needs to be scanned.
The distance attenuation characteristic of electromagnetic radiation is an important precondition for determining the radiation limit and the protection range. The electromagnetic interference limit value generally consists of a specific limit value and a measurement distance. When the interference limit at the radio receiver location is well defined, the guard distance is determined from the electromagnetic radiation as a function of distance according to the specific limit at the measurement location, the level of interference that the radio receiver at the guard distance may be subjected to being required to meet the receiver admission requirements. Therefore, it is of great importance to study the distance attenuation characteristics of electromagnetic radiation generated by different types of radiation sources. Currently, two simple models are generally used to predict electromagnetic radiation attenuation characteristics: a two-beam model (two-beam model) and a free-space dipole model.
Wherein the dual beam model is based on point source far field radiation characteristics, regards the earth as a specular reflection plane, and calculates the radiation power at the location of interest by optical geometry. The disadvantage of this method is that only electromagnetic radiation resulting from a change in the amount of charge at a fixed spatial location is considered and the effect of the charge space movement, i.e. the current, is ignored.
The free-space dipole model is based on the premise that virtually any radiation source can be mathematically abstracted into a spatially distributed combination of finite numbers of dipoles. A disadvantage of the free-space dipole model is that the effect of the earth on the radiation attenuation is not taken into account, resulting in electromagnetic radiation interference and errors in its protective range.
Disclosure of Invention
The embodiment of the invention provides a method and a device for evaluating electromagnetic radiation interference of a high-voltage direct-current converter station, which can effectively solve the problem that the electromagnetic radiation interference and the protection range thereof are error due to the fact that the free space dipole model does not consider the influence of the earth on radiation attenuation in the prior art, and can effectively reduce the influence of the electromagnetic radiation interference of the converter station.
An embodiment of the present invention provides a method for evaluating electromagnetic radiation interference of a high-voltage direct current converter station, including:
setting a preset model according to the soil conductivity parameters to obtain a dipole radiation calculation model considering the ground factors; the soil conductivity parameters are soil area conductivity and soil area dielectric constant;
and performing simulation calculation on electromagnetic radiation attenuation characteristics by adopting the dipole radiation calculation model considering the ground factors, and determining a radio interference limit value and a corresponding protection range thereof.
As an improvement of the above scheme, the setting of the preset model according to the soil conductivity parameter, to obtain a dipole radiation calculation model considering the ground factor, specifically includes:
a dipole radiation calculation model taking into account the ground factor is obtained according to the following formula:
wherein E (R) is the electric field strength of the electric dipole in the radiated electric field, idl is the electric dipole, ω is the angular frequency, λ is the wavelength, N e0λ As longitudinal polarization vector eigenfunction, ε 0 is air region dielectric constant, u 0 For the magnetic permeability of the space region, epsilon is the conductivity of the soil region, sigma is the dielectric constant of the soil region, and Z0 is the electric dipole radiation height;
as an improvement of the above solution, the simulating calculation of the electromagnetic radiation attenuation characteristic by using the dipole radiation calculation model considering the ground factor, determining the radio interference limit value and the corresponding protection range thereof includes:
inputting a plurality of preset horizontal distances and a plurality of preset frequencies into the dipole radiation calculation model considering the ground factors for simulation calculation to obtain a change curve of the radiation field intensity along with the horizontal distances under different frequencies; the horizontal distance is the distance from a preset observation point in the radiation electric field to the radiation source;
according to the change curve of the radiation field intensity along with the horizontal distance under different frequencies, calculating the difference value of the obtained radiation field intensities corresponding to two horizontal distances under one frequency to obtain the intensity attenuation amplitude of the first radiation electric field;
and calculating the difference value between the intensity attenuation amplitude of the first radiation electric field and the electromagnetic interference limit value standard to obtain a first radio interference limit value and a corresponding protection range thereof.
As an improvement of the above solution, the method further includes:
according to the change curve of the radiation field intensity along with the horizontal distance at different frequencies, calculating the difference value of the obtained radiation field intensities corresponding to two frequencies at the horizontal distance to obtain the intensity attenuation amplitude of the second radiation electric field;
and calculating the difference value between the intensity attenuation amplitude of the second radiation electric field and the electromagnetic interference limit value standard to obtain a second radio interference limit value and a corresponding protection range thereof.
Another embodiment of the present invention correspondingly provides an apparatus for evaluating electromagnetic radiation interference of a hvdc converter station, including:
the model construction module is used for setting a preset model according to the soil conductivity parameters to obtain a dipole radiation calculation model considering the ground factors; the soil conductivity parameters are soil area conductivity and soil area dielectric constant;
and the simulation calculation model is used for performing simulation calculation on electromagnetic radiation attenuation characteristics by adopting the dipole radiation calculation model considering the ground factors, and determining a radio interference limit value and a corresponding protection range thereof.
As an improvement of the scheme, the model construction module sets a preset model according to the soil conductivity parameters to obtain a dipole radiation calculation model considering the ground factors; wherein, the soil conductivity parameter is soil area conductivity and soil area dielectric constant, specifically includes:
a dipole radiation calculation model taking into account the ground factor is obtained according to the following formula:
wherein E (R) is the electric field strength of the electric dipole in the radiated electric field, idl is the electric dipole, ω is the angular frequency, λ is the wavelength, N e0λ As longitudinal polarization vector eigenfunction, ε 0 Is the dielectric constant of the air region, u 0 For the magnetic permeability of the space region, epsilon is the conductivity of the soil region, sigma is the dielectric constant of the soil region, Z 0 Is the electric dipole radiation height;
as an improvement of the above solution, the simulation calculation model adopts the dipole radiation calculation model considering the ground factor to perform simulation calculation on electromagnetic radiation attenuation characteristics, and determines a radio interference limit value and a corresponding protection range thereof, including:
inputting a plurality of preset horizontal distances and a plurality of preset frequencies into the dipole radiation calculation model considering the ground factors for simulation calculation to obtain a change curve of the radiation field intensity along with the horizontal distances under different frequencies; the horizontal distance is the distance from a preset observation point in the radiation electric field to the radiation source;
according to the change curve of the radiation field intensity along with the horizontal distance under different frequencies, calculating the difference value of the obtained radiation field intensities corresponding to two horizontal distances under one frequency to obtain the intensity attenuation amplitude of the first radiation electric field;
and calculating the difference value between the intensity attenuation amplitude of the first radiation electric field and the electromagnetic interference limit value standard to obtain a first radio interference limit value and a corresponding protection range thereof.
As an improvement of the above solution, the simulation calculation model further includes:
according to the change curve of the radiation field intensity along with the horizontal distance at different frequencies, calculating the difference value of the obtained radiation field intensities corresponding to two frequencies at the horizontal distance to obtain the intensity attenuation amplitude of the second radiation electric field;
and calculating the difference value between the intensity attenuation amplitude of the second radiation electric field and the electromagnetic interference limit value standard to obtain a second radio interference limit value and a corresponding protection range thereof.
Another embodiment of the present invention provides an apparatus for evaluating electromagnetic radiation interference of a hvdc converter station, which includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor implements the method for evaluating electromagnetic radiation interference of a hvdc converter station according to the embodiment of the present invention when executing the computer program.
Another embodiment of the present invention provides a storage medium, where the storage medium includes a stored computer program, and when the computer program runs, the device where the storage medium is controlled to execute the method for evaluating electromagnetic radiation interference of the hvdc converter station according to the embodiment of the present invention.
Compared with the prior art, the embodiment of the invention discloses a method and a device for evaluating electromagnetic radiation interference of a high-voltage direct current converter station, which are used for setting a preset model according to soil conductivity parameters to obtain a dipole radiation calculation model considering ground factors, wherein the soil conductivity parameters are soil area conductivity and soil area dielectric constant, the dipole radiation calculation model considering the ground factors is used for carrying out simulation calculation on electromagnetic radiation attenuation characteristics to determine radio interference limit values and corresponding protection ranges thereof, and the dipole radiation calculation model considering the ground factors is used for effectively solving the problem that the free space dipole model does not consider the influence of the ground on radiation attenuation on the calculation of the electromagnetic radiation interference and the protection ranges thereof in the prior art, effectively reducing the influence of the electromagnetic radiation interference of the converter station and providing an effective method for researching the calculation of the electromagnetic radiation attenuation characteristics.
Drawings
Fig. 1 is a flow chart of a method for evaluating electromagnetic radiation interference of a hvdc station according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a calculation model of dipole radiation taking into account ground factors according to an embodiment of the present invention;
FIG. 3 is a graph of radiated field strength versus horizontal distance at different frequencies taking into account ground factors, in accordance with an embodiment of the present invention;
FIG. 4 is a graph of radiated field strength versus horizontal distance at different frequencies for an ideal conductor with ground according to one embodiment of the present invention;
FIG. 5 is a graph showing the effect of dipole radiation heights at different frequencies on electromagnetic radiation attenuation characteristics according to one embodiment of the present invention;
FIG. 6 is a graph of radio interference limits at different horizontal distances provided by an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an apparatus for evaluating electromagnetic radiation interference of a hvdc station according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, a flow chart of a method for evaluating electromagnetic radiation interference of a hvdc converter station according to an embodiment of the present invention is shown, including:
s11, setting a preset model according to soil conductive parameters to obtain a dipole radiation calculation model considering ground factors; the soil conductivity parameters are soil area conductivity and soil area dielectric constant.
Preferably, FEKO electromagnetic field simulation software is adopted in the embodiment, a dipole radiation calculation model containing horizontal ground influence is established, and simulation calculation is carried out on the ground radiation electromagnetic field in the frequency range of 10Hz-600 MHz.
Referring to fig. 2, a schematic diagram of a dipole radiation calculation model taking ground factors into consideration according to an embodiment of the present invention includes: the upper half area of the ρ axis (i.e., z > 0 area) is the air area; the lower half area of the rho axis (namely z < 0 area) is a soil area; the plane where the ρ axis is located (i.e., z=0) is the interface between the air area and the soil area, P is the position of the observation point in the air area, its corresponding position vector is R, and the horizontal distance from the radiation source is D.
Preferably, step S11 is specifically:
a dipole radiation calculation model taking into account the ground factor is obtained according to the following formula:
wherein E (R) is the electric field strength of the electric dipole in the radiated electric field, idl is the electric dipole, ω is the angular frequency, λ is the wavelength, N e0λ As longitudinal polarization vector eigenfunction, ε 0 Is the dielectric constant of the air region, u 0 For the magnetic permeability of the space region, epsilon is the conductivity of the soil region, sigma is the dielectric constant of the soil region, Z 0 Is the electric dipole radiation height;
for example, the soil conductivity parameter takes the value epsilon=15, sigma=0.01S/m.
S12, performing simulation calculation on electromagnetic radiation attenuation characteristics by adopting the dipole radiation calculation model considering the ground factors, and determining a radio interference limit value and a corresponding protection range thereof.
Preferably, a plurality of preset horizontal distances and a plurality of preset frequencies are input into the dipole radiation calculation model considering the ground factors for simulation calculation, and a change curve of the radiation field intensity along with the horizontal distances under different frequencies is obtained.
The horizontal distance is a distance from an observation point P preset in the radiation electric field to the radiation source.
Referring to fig. 3, a graph of variation of radiation field strength with horizontal distance at different frequencies considering ground factors according to an embodiment of the present invention includes a graph of variation of radiation field strength at different frequencies with horizontal distance D as x-axis and radiation field strength E as y-axis; wherein, the frequency comprises 10Hz, 100kHz, 1.2MHz, 30MHz, 100MHz and 600MHz.
Preferably, the radiation field intensity at the different frequencies is horizontally distantVarying the radiated electric field height Z of the graph 0 =1m, the soil conductivity parameter is ε=15, σ=0.01S/m.
In an alternative embodiment, see fig. 3, according to the variation curve of the radiation field intensity along with the horizontal distance at the different frequencies, performing difference calculation on the obtained radiation field intensities corresponding to two different horizontal distances at one of the frequencies to obtain a first radiation electric field intensity attenuation amplitude;
and calculating the difference value between the intensity attenuation amplitude of the first radiation electric field and the electromagnetic interference limit value standard to obtain a first radio interference limit value and a corresponding protection range thereof.
In an alternative embodiment, see fig. 3, according to the variation curve of the radiation field intensity with the horizontal distance at the different frequencies, performing difference calculation on the obtained radiation field intensities corresponding to two different frequencies at the horizontal distance to obtain a second radiation field intensity attenuation amplitude;
and calculating the difference value between the intensity attenuation amplitude of the second radiation electric field and the electromagnetic interference limit value standard to obtain a second radio interference limit value and a corresponding protection range thereof.
In a further preferred embodiment, based on the above embodiment, the electric dipole radiates a height Z 0 Electromagnetic radiation attenuation characteristics with a frequency ranging from 10Hz to 600MHz are obtained with values ranging from 1m to 20m.
Referring to FIG. 4, a graph of radiated field strength versus horizontal distance at different frequencies for an ideal conductor of the earth according to an embodiment of the present invention includes an electric dipole radiated height Z with horizontal distance D as the x-axis and radiated field strength E as the y-axis 0 The horizontal distance D takes a value of 1m-20m, which simulates the decay curve of the radiated electric field intensity with horizontal distance.
It will be appreciated that when simulating the earth with an ideal conductor plane, the radiated electric field decays faster in the near field region; in the far field region, the radiation electric field decays slowly, basically decaying according to the 1/D rule. For 100kHz, 1.2MHz, λ0/2π corresponds to horizontal distances of about 480m and 40m; for 10Hz, the near field range calculation is 477km, exceeding 10km; when the frequency exceeds 10MHz, the near field region corresponds to a horizontal distance of no more than 5m.
It is understood that the radiation electric field decays faster in the near field region, the higher order term of 1/D plays a major role; the radiated electric field decays in the far field region according to a 1/D law.
Wherein when D > lambda 0 When the ratio is/2pi, the observation point is in a far-field region, and when D is less than lambda 0 When the temperature is/2 pi, the observation point is in a near field region; lambda (lambda) 0 Is a free space wavelength.
Further, comparing fig. 3 with fig. 4, typical soil parameters have the same trend as the ideal conductor plane calculation results for 10Hz, 100kHz, 1.2 MHz; the corresponding curves in FIG. 3 are between 1/D and 1/D for 30MHz, 100MHz, 600MHz 2 And more rapidly decays than in the case of an ideal conductor at ground. Thus, soil parameters have a significant impact on the attenuation of the radiated electric field, especially at higher frequencies.
It will be appreciated that the soil parameters have a certain effect on the attenuation characteristics of the ground field strength, especially at higher frequencies. The dipole radiation source ground clearance has a larger influence on the distribution characteristic of a radiation electric field in a near field region, and the attenuation trend is insensitive to the change of the radiation source ground clearance in a far field region.
Preferably, the values of the geodetic parameters in electromagnetic radiation studies are epsilon=15, sigma=0.01S/m, depending on the actual land soil characteristics.
In an alternative embodiment, the electric dipole radiation height Z is based on the above-described geodetic parameters 0 When the values are 1m, 3m, 5m, 8m, 15m and 20m respectively, the electromagnetic radiation attenuation characteristic is simulated and calculated by adopting the dipole radiation calculation model considering the ground factor, and the influence of the dipole radiation source height on the electromagnetic radiation attenuation characteristic is obtained.
Referring to FIG. 5, a graph of the effect of dipole radiation height on electromagnetic radiation attenuation characteristics at different frequencies according to an embodiment of the present invention is shown, wherein the horizontal distance D is taken as the x-axis, the radiation electric field intensity E is taken as the y-axis, and the attenuation curve of the simulated radiation electric field intensity with the horizontal distance is shown, which comprises FIG. 5 (a) which is a graph of the effect of dipole radiation height on electromagnetic radiation attenuation characteristics at 100kHz,FIG. 5 (b) is a graph showing the effect of the dipole radiation height on the electromagnetic radiation attenuation characteristic at 1.2MHz, FIG. 5 (c) is a graph showing the effect of the dipole radiation height on the electromagnetic radiation attenuation characteristic at 30MHz, and FIG. 5 (d) is a graph showing the effect of the dipole radiation height on the electromagnetic radiation attenuation characteristic at 100 MHz; wherein the electric dipole radiates at a height Z 0 The values are 1m, 3m, 5m, 8m, 15m and 20m respectively.
As can be seen from fig. 5, in the near field range, the dipole radiation source has a relatively large influence on the distribution of the radiation electric field, and the lower the frequency, the more obvious the influence is; in the far field range, the radiation electric field attenuation trend is highly insensitive to the radiation source. When the frequency is lower than 100MHz and the horizontal distance is larger than 100m, the influence on the electric field attenuation is small when the height of the radiation source is changed from 1m to 20m.
In an alternative embodiment, step S12 is specifically:
referring to FIG. 6, a graph of radio interference limit values at different horizontal distances, including dipole radiation height Z, is provided according to an embodiment of the present invention 0 Simulation was performed with frequency as x-axis, radio interference field strength limit as y-axis, =1m, =ε=15, σ=0.01S/m.
Preferably, as in fig. 6, a frequency of 1.2MHz is taken as an example. According to fig. 3, the difference between the radiation electric field intensities at the horizontal distances D of 450m and 1000m of the curve of 1.2MHz is-102.0 dB and-108.9 dB, respectively, to obtain the radiation electric field intensity attenuation amplitude (-102.0 dB) - (-108.9 dB) =6.9 dB.
Preferably, domestic extra-high voltage and high voltage direct current engineering is controlled mainly by the limit of electromagnetic interference according to DL/T275, i.e. the radio interference level at all frequencies within 0.5MHz-20MHz from the converter station 450m is not more than 40dB mu V/m. For the allowable interference limit value of the receiver, there is no unified international standard in the range of 150kHz-30MHz, and the GIGRE gives the allowable interference limit value curve of the radio receiver of the frequency band after integrating the worldwide requirements.
Further, the interference limit at a frequency of 1.2MHz at 450m in DL/T275 is 40dB μV/m (see Point01 in FIG. 6). Subtracting the attenuation amplitude of 6.9dB from the interference limit at 450m yields a corresponding radio interference limit at 1000m of 40dB V/m-6.9 db=33.1 dB V/m (see point02 in fig. 6).
Wherein, see dashed line in fig. 6 for GIGRE receiver limit.
When limiting values are required for the interference source and the receiver according to DL/T275 and GIGRE respectively, the radio interference protection range is larger than 1.7km, namely, the radio interference suffered by the radio receiver with the horizontal distance of more than 1.7km from the interference source does not exceed the recommended value of GIGRE.
Preferably, the process is repeated for all frequencies within 0.5MHz-20MHz and different distances, so that radio interference limits at different distances can be obtained, and thus the radio interference protection range is determined.
Referring to fig. 7, a schematic structural diagram of an apparatus for evaluating electromagnetic radiation interference of a hvdc converter station according to an embodiment of the present invention is provided, including:
the model construction module 1 is used for setting a preset model according to soil conductive parameters to obtain a dipole radiation calculation model considering the ground factors; the soil conductivity parameters are soil area conductivity and soil area dielectric constant;
and the simulation calculation model 2 is used for performing simulation calculation on electromagnetic radiation attenuation characteristics by adopting the dipole radiation calculation model considering the ground factors, and determining a radio interference limit value and a corresponding protection range thereof.
In an alternative embodiment, the model building module 1 comprises:
a modeling unit for deriving a dipole radiation calculation model taking into account the ground factor according to the following formula:
wherein E (R) is the electric field strength of the electric dipole in the radiated electric field, idl is the electric dipole, ω is the angular frequency, λ is the wavelength, N e0λ As longitudinal polarization vector eigenfunction, ε 0 Is the dielectric constant of the air region, u 0 Is the magnetic permeability of the space region, epsilon isThe conductivity of the soil area, sigma is the dielectric constant of the soil area, Z 0 Is the electric dipole radiation height;
in an alternative embodiment, the model building module 2 comprises:
the electromagnetic radiation attenuation characteristic calculation unit is used for inputting a plurality of preset horizontal distances and a plurality of preset frequencies into the dipole radiation calculation model considering the ground factors to carry out simulation calculation so as to obtain a change curve of the radiation field intensity along with the horizontal distances under different frequencies; the horizontal distance is the distance from a preset observation point in the radiation electric field to the radiation source;
the first radiation electric field intensity attenuation amplitude calculation unit is used for calculating the difference value of the obtained radiation field intensities corresponding to two horizontal distances at one frequency according to the change curve of the radiation field intensity along with the horizontal distance at the different frequencies to obtain the first radiation electric field intensity attenuation amplitude;
and the first radio interference limit value calculation unit is used for calculating the difference value between the intensity attenuation amplitude of the first radiation electric field and the electromagnetic interference limit value standard to obtain a first radio interference limit value and a corresponding protection range thereof.
In an alternative embodiment, the model building module 2 further comprises:
the second radiation electric field intensity attenuation amplitude calculation unit is used for calculating the difference value of the obtained radiation field intensities corresponding to two frequencies at a horizontal distance according to the change curve of the radiation field intensity with the horizontal distance at different frequencies to obtain the second radiation electric field intensity attenuation amplitude;
and the second radio interference limit value calculation unit is used for calculating the difference value between the intensity attenuation amplitude of the second radiation electric field and the electromagnetic interference limit value standard to obtain a second radio interference limit value and a corresponding protection range thereof.
Another embodiment of the present invention provides an apparatus for evaluating electromagnetic radiation interference of a hvdc converter station, comprising a processor, a memory and a computer program stored in the memory and configured to be run by the processor, the processor implementing the method for evaluating electromagnetic radiation interference of a hvdc converter station according to any of the above when running the computer program.
Another embodiment of the present invention provides a computer readable storage medium, where the computer readable storage medium includes a stored computer program, where the computer program when executed controls a device where the computer readable storage medium is located to perform the method for evaluating electromagnetic radiation interference of a hvdc converter station according to any one of the above.
The processor may be a central processing unit (Central Processing Unit, CPU), other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, which is a control center of the evaluation device for electromagnetic radiation interference of the hvdc station, and the various interfaces and lines are used to connect the various parts of the evaluation device for electromagnetic radiation interference of the entire hvdc station.
The memory may be used to store the computer program and/or the module, and the processor may implement various functions of the device for evaluating electromagnetic radiation interference of the hvdc station by running or executing the computer program and/or the module stored in the memory and invoking data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like; the storage data area may store data (such as audio data, phonebook, etc.) created according to the use of the handset, etc. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as a hard disk, memory, plug-in hard disk, smart Media Card (SMC), secure Digital (SD) Card, flash Card (Flash Card), at least one disk storage device, flash memory device, or other volatile solid-state storage device.
Wherein the modules/units integrated in the evaluation device of electromagnetic radiation interference of the hvdc station may be stored in a computer readable storage medium if implemented in the form of software functional units and sold or used as separate products. Based on such understanding, the present invention may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. It should be noted that the computer readable medium contains content that can be appropriately scaled according to the requirements of jurisdictions in which such content is subject to legislation and patent practice, such as in certain jurisdictions in which such content is subject to legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunication signals.
It should be noted that the above-described apparatus embodiments are merely illustrative, and the units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, in the drawings of the embodiment of the device provided by the invention, the connection relation between the modules represents that the modules have communication connection, and can be specifically implemented as one or more communication buses or signal lines. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
Claims (6)
1. A method for evaluating electromagnetic radiation interference of a high voltage direct current converter station, comprising:
setting a preset model according to the soil conductivity parameters to obtain a dipole radiation calculation model considering the ground factors; the soil conductivity parameters are soil area conductivity and soil area dielectric constant;
the electromagnetic radiation attenuation characteristic is simulated and calculated by adopting the dipole radiation calculation model considering the ground factors, and the radio interference limit value and the corresponding protection range are determined, comprising the following steps: inputting a plurality of preset horizontal distances and a plurality of preset angular frequencies into the dipole radiation calculation model considering the ground factors for simulation calculation to obtain a change curve of the radiation field intensity along with the horizontal distances under different frequencies; the horizontal distance is the horizontal distance from a preset observation point in the radiation electric field to the radiation source; according to the change curve of the radiation field intensity along with the horizontal distance under different frequencies, calculating the difference value of the obtained radiation field intensities corresponding to two horizontal distances under one frequency to obtain the intensity attenuation amplitude of the first radiation electric field; performing difference value calculation on the intensity attenuation amplitude of the first radiation electric field and an electromagnetic interference limit value standard to obtain a first radio interference limit value and a corresponding protection range thereof;
setting a preset model according to soil conductivity parameters to obtain a dipole radiation calculation model considering the ground factors, wherein the model comprises the following specific steps:
obtaining a dipole radiation calculation model taking the ground factor into consideration according to the formula (1):
wherein E (R) is the electric field strength of the electric dipole in the radiation electric field, R is the space vector from the radiation source to the observation point, idl is the electric dipole, ω is the angular frequency, λ is the wavelength, N e0λ As longitudinal polarization vector eigenfunction, z 0 Is the electric dipole radiation height;
ε 0 is the dielectric constant of the air region, u 0 For the space region permeability, ε is the soil region conductivity and σ is the soil region permittivity.
2. A method of evaluating electromagnetic radiation interference of a high voltage direct current converter station according to claim 1, wherein the method further comprises:
according to the change curve of the radiation field intensity along with the horizontal distance at different frequencies, calculating the difference value of the obtained radiation field intensities corresponding to two frequencies at the horizontal distance to obtain the intensity attenuation amplitude of the second radiation electric field;
and calculating the difference value between the intensity attenuation amplitude of the second radiation electric field and the electromagnetic interference limit value standard to obtain a second radio interference limit value and a corresponding protection range thereof.
3. An apparatus for evaluating electromagnetic radiation interference of a high voltage direct current converter station, comprising:
the model construction module is used for setting a preset model according to the soil conductivity parameters to obtain a dipole radiation calculation model considering the ground factors; the soil conductivity parameters are soil area conductivity and soil area dielectric constant;
the simulation calculation model is used for performing simulation calculation on electromagnetic radiation attenuation characteristics by adopting the dipole radiation calculation model considering the ground factors, and determining a radio interference limit value and a corresponding protection range thereof, and comprises the following steps: inputting a plurality of preset horizontal distances and a plurality of preset angular frequencies into the dipole radiation calculation model considering the ground factors for simulation calculation to obtain a change curve of the radiation field intensity along with the horizontal distances under different frequencies; the horizontal distance is the horizontal distance from a preset observation point in the radiation electric field to the radiation source; according to the change curve of the radiation field intensity along with the horizontal distance under different frequencies, calculating the difference value of the obtained radiation field intensities corresponding to two horizontal distances under one frequency to obtain the intensity attenuation amplitude of the first radiation electric field; performing difference value calculation on the intensity attenuation amplitude of the first radiation electric field and an electromagnetic interference limit value standard to obtain a first radio interference limit value and a corresponding protection range thereof;
setting a preset model according to soil conductivity parameters to obtain a dipole radiation calculation model considering the ground factors, wherein the model comprises the following specific steps:
obtaining a dipole radiation calculation model taking the ground factor into consideration according to the formula (1):
wherein E (R) is the electric field strength of the electric dipole in the radiation electric field, R is the space vector from the radiation source to the observation point, idl is the electric dipole, ω is the angular frequency, λ is the wavelength, N e0λ As longitudinal polarization vector eigenfunction, z 0 Is the electric dipole radiation height;
ε 0 is the dielectric constant of the air region, u 0 For the space region permeability, ε is the soil region conductivity and σ is the soil region permittivity.
4. A device for evaluating electromagnetic radiation interference of a high voltage direct current converter station according to claim 3, wherein said simulation calculation model further comprises:
according to the change curve of the radiation field intensity along with the horizontal distance at different frequencies, calculating the difference value of the obtained radiation field intensities corresponding to two frequencies at the horizontal distance to obtain the intensity attenuation amplitude of the second radiation electric field;
and calculating the difference value between the intensity attenuation amplitude of the second radiation electric field and the electromagnetic interference limit value standard to obtain a second radio interference limit value and a corresponding protection range thereof.
5. An evaluation device of electromagnetic radiation interference of a hvdc converter station comprising a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, the processor implementing the evaluation method of electromagnetic radiation interference of a hvdc converter station according to any of claims 1 to 2 when the computer program is executed.
6. A computer readable storage medium, characterized in that the computer readable storage medium comprises a stored computer program, wherein the computer program, when run, controls a device in which the computer readable storage medium is located to perform a method of evaluating electromagnetic radiation interference of a hvdc converter station according to any of claims 1 to 2.
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