Acoustic power inversion calculation method of alternating current and direct current filtering field equipment

Abstract

A sound power inversion calculation method for AC / DC filtering field equipment comprises the following steps: establishing a sound source model according to the actual position of the AC / DC filtering field equipment in a filtering field; measuring point positions are selected, and measuring point sound pressure of different sound sources of each measuring point is calculated; obtaining a difference between the sound pressure of the measuring point and the actually measured sound pressure to form a loss function, and optimizing a sound pressure amplitude and a phase angle at a position one meter away from the center of the sound source by using a particle swarm algorithm to obtain the sound pressure amplitude and the phase angle; and substituting the sound pressure amplitude into a sound power calculation formula of the alternating current and direct current filtering field equipment, and solving the sound power level of each piece of alternating current and direct current filtering field equipment.

Description

Technical Field

[0001] The invention relates to the technical field of AC / DC filter field equipment noise, and in particular to a sound power inversion calculation method for AC / DC filter field equipment. Background Art

[0002] With the rapid development of power transmission projects, noise pollution caused by power equipment has attracted widespread attention. The AC / DC filter field in the UHV converter station contains a large number of filter reactors, filter capacitors and other equipment. Parameters such as the sound power spectrum of the equipment directly affect the calculation and control of the converter station noise. Accurately predicting the sound power spectrum of the reactor and capacitor operation process in a complex sound field is crucial for the prediction of AC filter field noise and the formulation of converter station noise control plans.

[0003] The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Summary of the invention

[0004] The present invention provides a sound power inversion calculation method for AC / DC filter field equipment, which solves the influence of sound wave interference in the filter field on the sound power prediction and accurately predicts the sound power level of capacitors and reactors in complex sound fields.

[0005] A method for calculating the acoustic power inversion of an AC / DC filter field device comprises:

[0006] Step 1, establishing a sound source model according to the actual position of the AC / DC filter field equipment in the filter field;

[0007] Step 2, select the measurement point location and calculate the measurement point sound pressure of different sound sources at each measurement point;

[0008] Step 3: The difference between the sound pressure at the measuring point and the actual sound pressure is used to form a loss function. The particle swarm algorithm is used to optimize the sound pressure amplitude and phase angle at 1m away from the center of the sound source as unknown particles. The particle range and number of iterations are set to calculate the fitness of the particles. If the global optimal solution is not met, the particle speed and position are updated and iterated again until the termination condition is met to obtain the global optimal solution. Calculate 100 times and select the group of results with the highest frequency in the convergence results as the inversion results;

[0009] Step 4: Substitute the sound pressure amplitude into the sound power calculation formula of the AC / DC filter field equipment to calculate the sound power level of each AC / DC filter field equipment.

[0010] In the acoustic power inversion calculation method of an AC / DC filter field device, the AC / DC filter field device includes a reactor and a capacitor tower.

[0011] In the acoustic power inversion calculation method of the AC / DC filter field equipment, the reactor is a point sound source and the capacitor tower is a line sound source.

[0012] In the acoustic power inversion calculation method of an AC / DC filter field device, the filter field includes four devices, which are two reactors and two capacitor towers. The reactor is equivalent to a point sound source, and the capacitor tower is equivalent to a line sound source. According to the spatial position, an acoustic model is constructed. The propagation calculation formula of the point sound source in space is as follows:

[0013] ,

[0014] is the total sound pressure at the measuring point, is the sound pressure amplitude at 1m from the center of the point sound source, is the distance of the direct path, is the distance of the reflection path, is the wave number, which is related to the frequency, and R is the reflection coefficient; the line sound source is equivalent to a series of point sound sources, the distance between the two sound sources is less than half of the highest frequency wavelength in the working frequency range, and the length of the line sound source is greater than half of the lowest frequency wavelength in the working frequency range.

[0015] In the acoustic power inversion calculation method of the AC / DC filter field equipment, the acoustic pressure of the jth measuring point in the space is

[0016] ,

[0017] in is the sound pressure generated by the ith sound source at the jth measuring point, To measure the total sound pressure at the measurement point, construct the error function

[0018] ,

[0019] is the sound pressure amplitude coefficient of different sound sources, is the initial phase angle of sound pressure,

[0020] is the sound pressure amplitude at the jth measuring point, which is a function of the sound pressure amplitude coefficient and phase angle. The sound pressure value measured at the jth measuring point is calculated, and the square root of the difference between the calculated value and the measured value of each measuring point is added as the loss function. The PSO algorithm is used to find the optimal solution and obtain the required and .

[0021] In the acoustic power inversion calculation method of the AC / DC filter field equipment, the acoustic power calculation formula is: , is the medium density in , is the speed of sound, in , r is 1, That is the sound pressure coefficient obtained by inversion,

[0022] The sound power of a line sound source is the sum of the sound power of point sound sources. , is the sound power of the line source, is the sound power of the point sound source.

[0023] The relationship between sound power level and sound power, is the sound power level, is the sound power, is the reference value, .

[0024] In the acoustic power inversion calculation method of the AC / DC filter field equipment, the sound source radiation of the point sound source is a sphere.

[0025] An acoustic power inversion calculation system for AC / DC filter field equipment includes:

[0026] A sound source model unit, which is used to establish a sound source model according to the actual position of the AC and DC filter field equipment in the filter field;

[0027] A sound measurement unit, which is used to calculate the sound pressure of each measuring point from different sound sources according to the position of the measuring point;

[0028] A particle swarm algorithm unit, which is used to form a loss function by subtracting the sound pressure at the measuring point from the actually measured sound pressure, and to optimize the sound pressure amplitude and phase angle at a distance of one meter from the center of the sound source by using the particle swarm algorithm to obtain the sound pressure amplitude and phase angle;

[0029] The sound power calculation unit is used to substitute the sound pressure amplitude into the sound power calculation formula of the AC / DC filter field equipment to calculate the sound power level of each AC / DC filter field equipment.

[0030] A computer storage medium includes computer instructions, which, when executed on a computer, cause the computer to execute the method described.

[0031] An electronic device, comprising:

[0032] A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein:

[0033] When the processor executes the program, the method described is implemented.

[0034] Compared with the prior art, the present invention has the following advantages: the device sound power inversion calculation based on the particle swarm algorithm solves the influence of sound wave interference in the filter field on the sound power prediction, and accurately predicts the sound power level of capacitors and reactors in complex sound fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] By reading the detailed description of the preferred specific embodiments below, various other advantages and benefits of the present invention will become clear to those of ordinary skill in the art. The drawings in the specification are only for the purpose of illustrating the preferred embodiments and are not considered to be limitations of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative work. Moreover, the same reference numerals are used to represent the same components throughout the drawings.

[0036] In the attached picture:

[0037] Figure 1 Schematic diagram of measuring point location;

[0038] Figure 2 This is a schematic diagram of ground reflection;

[0039] Figure 3 The diagram of the relationship between the frequency and the sound power level of the L1 inversion result and the set value; L1 is the reactor 1, and the set value is a reference value based on the actual power on site;

[0040] Figure 4 The diagram of the relationship between the frequency and the sound power level of the L2 inversion result and the set value; L2 is the reactor 2, and the set value is a reference value based on the actual power on site;

[0041] Figure 5 The diagram of the relationship between the frequency and the sound power level of the inversion result of C1 and the set value; C1 is the capacitor tower 1, and the set value is a reference value given based on the actual power on site;

[0042] Figure 6 Schematic diagram of the relationship between the frequency and sound power level of the inversion result of C2 and the set value; C2 is capacitor tower 2, and the set value is a reference value given based on the actual power on site.

[0043] The present invention is further explained below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0044] The specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the specific embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0045] It should be noted that certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that technicians may use different nouns to refer to the same component. This specification and claims do not use the difference in nouns as a way to distinguish components, but use the difference in the functions of the components as the criterion for distinction. As mentioned throughout the specification and claims, "including" or "comprising" is an open term, so it should be interpreted as "including but not limited to". The subsequent description of the specification is a preferred embodiment of the present invention, but the description is based on the general principles of the specification and is not intended to limit the scope of the present invention. The scope of protection of the present invention shall be determined by the attached claims.

[0046] To facilitate understanding of the embodiments of the present invention, further explanation will be given below by taking specific embodiments as examples in conjunction with the accompanying drawings, and each of the accompanying drawings does not constitute a limitation on the embodiments of the present invention.

[0047] like Figures 1 to 6 As shown, the sound power inversion calculation method of the AC / DC filter field equipment includes the following steps:

[0048] Step 1, establishing a sound source model according to the actual position of the AC / DC filter field equipment in the filter field;

[0049] Step 2, select the measurement point location and calculate the measurement point sound pressure of different sound sources at each measurement point;

[0050] Step 3: The difference between the sound pressure at the measuring point and the actual sound pressure is used to form a loss function. The particle swarm algorithm is used to optimize the sound pressure amplitude and phase angle at 1m away from the center of the sound source as unknown particles. The particle range and number of iterations are set to calculate the fitness of the particles. If the global optimal solution is not met, the particle speed and position are updated and iterated again until the termination condition is met to obtain the global optimal solution. Calculate 100 times and select the group of results with the highest frequency in the convergence results as the inversion results;

[0051] Step 4: Substitute the sound pressure amplitude into the sound power calculation formula of the AC / DC filter field equipment to calculate the sound power level of each AC / DC filter field equipment.

[0052] In a preferred implementation of the acoustic power inversion calculation method for an AC / DC filter field device, the AC / DC filter field device includes a reactor and a capacitor tower.

[0053] In a preferred implementation of the acoustic power inversion calculation method for an AC / DC filter field device, the reactor is a point sound source and the capacitor tower is a line sound source.

[0054] In a preferred embodiment of the acoustic power inversion calculation method of the AC / DC filter field equipment, the filter field includes four devices, which are two reactors and two capacitor towers. The reactor is equivalent to a point sound source, and the capacitor tower is equivalent to a line sound source. According to the spatial position, an acoustic model is constructed. The propagation calculation formula of the point sound source in space is as follows:

[0055] ,

[0056] is the total sound pressure at the measuring point, is the sound pressure amplitude at 1m away from the center of the point sound source, is the distance of the direct path, is the distance of the reflection path, is the wave number, which is related to the frequency, and R is the reflection coefficient; the line sound source is equivalent to a series of point sound sources, the distance between the two sound sources is less than half of the highest frequency wavelength in the working frequency range, and the length of the line sound source is greater than half of the lowest frequency wavelength in the working frequency range.

[0057] In the preferred implementation of the acoustic power inversion calculation method of the AC / DC filter field equipment, the acoustic pressure of the jth measuring point in the space is

[0058] ,

[0059] in is the sound pressure generated by the ith sound source at the jth measuring point, For the total sound pressure at the measurement point, construct the error function

[0060] ,

[0061] is the sound pressure amplitude coefficient of different sound sources, is the initial phase angle of sound pressure,

[0062] is the sound pressure amplitude at the jth measuring point, which is a function of the sound pressure amplitude coefficient and phase angle. The sound pressure value measured at the jth measuring point is calculated, and the square root of the difference between the calculated value and the measured value of each measuring point is added as the loss function. The PSO algorithm is used to find the optimal solution and obtain the required and .

[0063] In the preferred embodiment of the acoustic power inversion calculation method of the AC / DC filter field device, the acoustic power calculation formula is: , is the medium density in , is the speed of sound, in , r is 1, p is the sound pressure coefficient obtained by inversion,

[0064] The sound power of a line sound source is the sum of the sound power of point sound sources. , is the sound power of the line source, is the sound power of a point sound source.

[0065] The relationship between sound power level and sound power, is the sound power level, is the sound power, is the reference value, .

[0066] In a preferred implementation of the acoustic power inversion calculation method for an AC / DC filter field device, the sound source radiation of the point sound source is a sphere.

[0067] An acoustic power inversion calculation system for AC / DC filter field equipment includes:

[0068] A sound source model unit, which is used to establish a sound source model according to the actual position of the AC and DC filter field equipment in the filter field;

[0069] A sound measurement unit, which is used to calculate the sound pressure of each measuring point of different sound sources according to the position of the measuring point;

[0070] A particle swarm algorithm unit, which is used to form a loss function by subtracting the sound pressure at the measuring point from the actually measured sound pressure, and to optimize the sound pressure amplitude and phase angle at a distance of one meter from the center of the sound source by using the particle swarm algorithm to obtain the sound pressure amplitude and phase angle;

[0071] The sound power calculation unit is used to substitute the sound pressure amplitude into the sound power calculation formula of the AC / DC filter field equipment to calculate the sound power level of each AC / DC filter field equipment.

[0072] A computer storage medium includes computer instructions, which, when executed on a computer, cause the computer to execute the method described.

[0073] An electronic device, comprising:

[0074] A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein:

[0075] When the processor executes the program, the method described is implemented.

[0076] In one embodiment, the acoustic power inversion calculation method of the AC / DC filter field device includes:

[0077] 1. The sound source model is established according to the actual position of the reactor and capacitor tower in the filter field. The reactor is a point sound source and the capacitor tower is a line sound source.

[0078] 2. Select the measurement point location and calculate the sound pressure contribution value of different sound sources at each measurement point.

[0079] 3. The difference between the calculated sound pressure at the measuring point and the actual measured sound pressure is used to form a loss function. The particle swarm algorithm is used to optimize the sound pressure amplitude and phase angle at one meter away from the center of the sound source to obtain the accurate values ​​of the sound pressure amplitude and phase angle.

[0080] 4. Substitute the sound pressure amplitude into the equipment sound power calculation formula to calculate the sound power level of each device.

[0081] In one embodiment,

[0082] 1. Build an acoustic model

[0083] Taking the DC filter field as an example, the DC filter field contains four devices, two reactors and two capacitor towers. The reactor is equivalent to a point sound source, and the capacitor tower is equivalent to a line sound source. An acoustic model is constructed according to the spatial position.

[0084] The propagation formula of a point sound source in space considering ground reflection is as follows:

[0085] (1)

[0086] It is the sound pressure amplitude at a distance of 1m from the center of the point sound source.

[0087] is the total sound pressure at the measuring point.

[0088] is the distance of the direct path.

[0089] is the distance of the reflection path.

[0090] R is the reflection coefficient.

[0091] is the wave number, which is related to the frequency.

[0092] The line sound source is equivalent to a series of point sound sources. The equivalent principle is as follows:

[0093] (1) The distance between the two sound sources should be less than half the wavelength of the highest frequency in the operating frequency range;

[0094] (2) The length of the line sound source should be greater than half the wavelength of the lowest frequency in the operating frequency range.

[0095] There are 2 reactors and 2 capacitor towers. The acoustic model consists of 2 independent point sound sources and 2 line sound sources. The line sound source is equivalent to a string of identical point sound sources. There are 4 different point sound sources in space. Each sound source has two unknown quantities to be calculated, the amplitude and phase angle of the sound pressure, and there are 8 unknown quantities to be calculated. According to the principle of reverse calculation, in order to ensure the convergence of the reverse calculation results, the number of known measuring point sound pressures should be at least 8. According to the relationship between the sound source position and the measuring point position and the propagation of sound waves, the mathematical model of acoustics is established.

[0096] 2. Build optimization function

[0097] According to formula (1), the sound pressure at the jth measuring point in space is

[0098] (2)

[0099] in is the sound pressure generated by the ith sound source at the jth measuring point, is the total sound pressure at the measurement point. Construct the error function

[0100] (3)

[0101] is the sound pressure amplitude coefficient of different sound sources, is the initial phase angle of sound pressure.

[0102] is the sound pressure amplitude at the jth measuring point, which is a function of the sound pressure amplitude coefficient and phase angle. The sound pressure value measured at the jth measuring point is calculated, and the square root of the difference between the calculated value and the measured value of each measuring point is added as the loss function. The optimal solution is found using PSO to obtain the required and

[0103] 3. Calculation of equipment sound power

[0104] In three-dimensional space, the total sound power can be expressed as the integral of the square of the sound pressure over a specific area.

[0105] The acoustic model of the reactor is equivalent to a point sound source, and the sound source radiation is a sphere. Considering that the space is a semi-free field and the sound source radiation surface is a hemispherical surface, the sound power calculation formula is:

[0106] (4)

[0107] is the sound power.

[0108] is the medium density in .

[0109] is the speed of sound, in .

[0110] r is equal to 1, and p is the sound pressure coefficient obtained by inversion.

[0111] The capacitor tower is a line sound source, which is equivalent to a string of point sound sources. The sound power of the line sound source is the sum of the sound powers of the point sound sources.

[0112] (5)

[0113] is the sound power of the line source, is the sound power of a point sound source.

[0114] The relationship between sound power level and sound power is as shown in formula (6):

[0115] (6)

[0116] is the sound power level, is the sound power, is the reference value, After multiple iterations, select the data with the highest frequency and calculate the sound power to get the result as follows: Figures 3 to 6 ,According to the comparison results, the acoustic power inversion is basically consistent with the ,actual value, which proves that the inversion method is feasible and ,accurate.

[0117] Although the embodiments of the present invention are described above in conjunction with the accompanying drawings, the present invention is not limited to the above specific embodiments and application fields, and the above specific embodiments are only illustrative and instructive, rather than restrictive. A person of ordinary skill in the art can also make many forms under the guidance of this specification and without departing from the scope of protection of the claims of the present invention, all of which belong to the protection of the present invention.

Claims

1. A method for calculating the acoustic power inversion of an AC / DC filter field device, characterized in that: The steps include: Step 1, establishing a sound source model according to the actual position of the AC / DC filter field equipment in the filter field; Step 2, select the measurement point location and calculate the measurement point sound pressure of different sound sources at each measurement point; Step 3, the sound pressure at the measuring point is subtracted from the actually measured sound pressure to form a loss function, and the particle swarm algorithm is used to optimize it. The sound pressure amplitude and phase angle at 1m away from the center of the sound source are taken as unknown particles, the particle range and number of iterations are set, and the fitness of the particles is calculated. If the global optimal solution is not met, the particle speed and position are updated, and it is iterated again until the termination condition is met to obtain the global optimal solution. The calculation is performed 100 times, and the group of results that appear most frequently in the convergence results is selected as the inversion result; Step 4, the sound pressure amplitude is substituted into the sound power calculation formula of the AC / DC filter field equipment to obtain the sound power level of each AC / DC filter field equipment.

2. The method for calculating the acoustic power inversion of an AC / DC filter field device according to claim 1, characterized in that: Preferably, the AC / DC filter field equipment includes a reactor and a capacitor tower.

3. The method for calculating the acoustic power inversion of an AC / DC filter field device according to claim 2, characterized in that: The reactor is a point sound source, and the capacitor tower is a line sound source.

4. The method for calculating the acoustic power inversion of an AC / DC filter field device according to claim 1, characterized in that: The filter field contains four devices, which are two reactors and two capacitor towers. The reactor is equivalent to a point sound source, and the capacitor tower is equivalent to a line sound source. According to the spatial position, an acoustic model is constructed. The calculation formula for the propagation of a point sound source in space is as follows: ， is the total sound pressure at the measuring point, is the sound pressure amplitude at 1m away from the center of the point sound source, is the distance of the direct path, is the distance of the reflection path, is the wave number, which is related to the frequency, and R is the reflection coefficient; the line sound source is equivalent to a series of point sound sources, the distance between the two sound sources is less than half of the highest frequency wavelength in the working frequency range, and the length of the line sound source is greater than half of the lowest frequency wavelength in the working frequency range.

5. The method for calculating the acoustic power inversion of an AC / DC filter field device according to claim 1, characterized in that: The sound pressure at the jth measuring point in space is ， in is the sound pressure generated by the ith sound source at the jth measuring point, For the total sound pressure at the measuring point, construct the error function ， is the sound pressure amplitude coefficient of different sound sources, is the initial phase angle of sound pressure, is the sound pressure amplitude at the jth measuring point, which is a function of the sound pressure amplitude coefficient and phase angle. The sound pressure value measured at the jth measuring point is calculated, and the square root of the difference between the calculated value and the measured value of each measuring point is added as the loss function. The PSO algorithm is used to find the optimal solution and obtain the required and .

6. The method for calculating the acoustic power inversion of an AC / DC filter field device according to claim 1, characterized in that: The formula for calculating sound power is: , is the sound power, is the medium density in , c is the speed of sound, in units of , r is 1, is the inverted sound pressure coefficient, The sound power of a line sound source is the sum of the sound power of point sound sources. , is the sound power of the line sound source, is the sound power of the point sound source, The relationship between sound power level and sound power, , is the sound power level, is the sound power, is the reference value, .

7. The method for calculating the acoustic power inversion of an AC / DC filter field device according to claim 1, characterized in that: The sound source radiation of a point sound source is a sphere.

8. An acoustic power inversion calculation system for AC / DC filter field equipment, characterized in that: These include, A sound source model unit, which is used to establish a sound source model according to the actual position of the AC and DC filter field equipment in the filter field; A sound measurement unit, which is used to calculate the sound pressure of each measuring point of different sound sources according to the position of the measuring point; A particle swarm algorithm unit, which is used to form a loss function by subtracting the sound pressure at the measuring point from the actually measured sound pressure, and to optimize the sound pressure amplitude and phase angle at a distance of one meter from the center of the sound source by using the particle swarm algorithm to obtain the sound pressure amplitude and phase angle; The sound power calculation unit is used to substitute the sound pressure amplitude into the sound power calculation formula of the AC / DC filter field equipment to calculate the sound power level of each AC / DC filter field equipment.

9. A computer storage medium, characterized in that The storage medium includes computer instructions, which, when executed on a computer, enable the computer to execute the method according to any one of claims 1 to 7.

10. An electronic device, characterized in that: The electronic device comprises: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the method according to any one of claims 1 to 7 is implemented.

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