A method and system for calculating noise source strength of converter transformer group

Abstract

The present invention discloses a method and system for calculating the noise source strength of a converter transformer group, comprising: establishing a simulation model of the converter transformer group, and determining the position of a measurement point and the position of an equivalent point sound source of each converter transformer; performing simulation calculation to obtain the sound level L of the i-th point sound source on the k-th converter transformer at the j-th measurement point. k PFj , and according to the sound level L k PFj Calculate the sound power measurement value E of the i-th point sound source on the k-th converter transformer at the j-th measurement point k Fj ; Construct the source strength E of the i-th point sound source on any converter transformer Si The corresponding sound power measurement value E k Fj The proportionality factor B k ji , and based on the proportionality factor B k ji Determine the sound power measurement value E k Fj Heyuanqiang E Si According to the first relationship, determine the sound power value E of all converter transformers at the jth measurement point Fj Heyuanqiang E Si According to the second relationship, an inverse calculation is performed to determine the source strength E of the i-th point sound source on any converter transformer Si .

Description

Technical Field

[0001] The present invention relates to the technical field of power grid environmental protection, and more specifically, to a method and system for calculating the noise source strength of a converter transformer group. Background Art

[0002] Ultra-high voltage power transmission has the characteristics of low energy loss, mature technology, and economic large-scale application in long-distance power transmission, and has been widely put into operation in various regions. With the increase in converter stations, the noise pollution to the surrounding environment has attracted more and more attention from the public, environmental protection departments and power grid companies. The main source of converter station noise is the converter transformer, so studying the radiated sound field of the converter transformer is very important for the analysis and control of converter station noise.

[0003] Since the field measurement sound level method requires that the project has been completed, and the cost of subsequent noise reduction treatment and related renovation after completion will also be very high, it is very important to evaluate the noise level through simulation calculations during the project design phase. In the simulation process, accurate converter transformer source strength is required to ensure the reliability of the calculation results. For this reason, we proposed to calculate the converter transformer source strength based on the measured data. When the converter transformer sound source is equivalent, the number of corresponding equivalent point sound sources is different due to the different sizes of the converter transformer. In theory, the larger the equivalent source volume and the more equivalent sound source points, the more similar the reconstructed sound field is to the actual sound field, but the increase in the number of equivalent sound source points also increases the amount of calculation. Summary of the invention

[0004] The present invention provides a method and system for calculating the noise source strength of a converter transformer group, so as to solve the problem of how to determine the noise source strength of the converter transformer.

[0005] In order to solve the above problem, according to one aspect of the present invention, a method for calculating the noise source strength of a converter transformer group is provided, the method comprising:

[0006] Establishing a simulation model of the converter transformer group, and determining the position of the measurement point and the position of the equivalent point sound source of each converter transformer based on the simulation model; wherein the source strengths of the point sound sources at the same relative position on each converter transformer are equal;

[0007] A simulation calculation is performed based on the simulation model to obtain the sound level L of the i-th point sound source on the k-th converter transformer at the j-th measurement point. k PFj , and according to the sound level L k PFj Calculate the sound power measurement value E of the i-th point sound source on the k-th converter transformer at the j-th measurement point k Fj ;

[0008] Construct the source strength E of the i-th point sound source on any converter transformer Si The corresponding sound power measurement value E k Fj The proportionality factor B k ji , and based on the proportionality coefficient B k ji Determine the sound power measurement value E k Fj and the source strength E of the i-th point sound source on any converter transformer Si The first relationship;

[0009] Determine the sound power value E of all converter transformers at the jth measurement point according to the first relationship Fj and the source strength E of the i-th point sound source on any converter transformer Si The second relationship;

[0010] According to the second relationship, an inverse calculation is performed to determine the source strength E of the i-th point sound source on any converter transformer. Si .

[0011] Preferably, the source strength E of the i-th point sound source on any converter transformer is constructed as follows: Si The corresponding sound power measurement value E k Fj The proportionality factor B k ji ,include:

[0012]

[0013]

[0014]

[0015]

[0016]

[0017]

[0018] Among them, the proportionality coefficient B k ji represents the propagation coefficient from the i-th point sound source on the k-th converter transformer to the j-th measurement point; E Si is the source strength of the i-th point sound source on any converter transformer, L PSi is the corresponding source strength level; N measurement points are taken in the sound field formed by the noise radiation of the converter transformer group, E k Fjis the sound power of the i-th point sound source on the k-th converter transformer at the j-th measurement point, L k PFj is the corresponding sound level; A k ji is the attenuation ratio of the sound wave propagating from the i-th point sound source on the k-th converter transformer to the j-th measurement point, L k Aji is the corresponding attenuation level; W ref is the preset reference value.

[0019] Preferably, the first relationship includes:

[0020]

[0021] Among them, the value range of j is [1, N]; the value range of i is [1, M]; N is the total number of measurement points; and M is the total number of equivalent point sound sources of each converter transformer.

[0022] Preferably, the second relationship includes:

[0023]

[0024] Among them, the value range of j is [1, N]; the value range of i is [1, M]; N is the total number of measurement points; M is the total number of point sound sources equivalent to each converter transformer; and L is the total number of converter transformers.

[0025] Preferably, the inverse calculation is performed according to the second relationship to determine the source strength E of the i-th point sound source on any converter transformer. Si ,include:

[0026]

[0027]

[0028]

[0029]

[0030] Among them, the value range of j is [1, N]; the value range of i is [1, M]; N is the total number of measurement points; M is the total number of equivalent point sound sources for each converter transformer; L is the total number of converter transformers; the number of measurement points N is greater than or equal to the number of equivalent sound source points M; when N = M, MB is a square matrix, MB is reversible, and the equations are solved to obtain Thus, the source strength E of the i-th point sound source on any converter transformer is determined Si ; When N is greater than M, the least squares method is used to calculate Thus, the source strength E of the i-th point sound source on any converter transformer is determined Si .

[0031] According to another aspect of the present invention, a system for calculating the noise source strength of a converter transformer group is provided, the system comprising:

[0032] A simulation model building unit is used to build a simulation model of the converter transformer group, and determine the position of the measurement point and the position of the equivalent point sound source of each converter transformer based on the simulation model; wherein the source strengths of the point sound sources with the same relative position on each converter transformer are equal;

[0033] The sound power measurement value acquisition unit is used to perform simulation calculation based on the simulation model to obtain the sound level L of the i-th point sound source on the k-th converter transformer at the j-th measurement point. k PFj , and according to the sound level L k PFj Calculate the sound power measurement value E of the i-th point sound source on the k-th converter transformer at the j-th measurement point k Fj ;

[0034] The first relationship determination unit is used to construct the source strength E of the i-th point sound source on any converter transformer Si The corresponding sound power measurement value E k Fj The proportionality factor B k ji , and based on the proportionality coefficient B k ji Determine the sound power measurement value E k Fj and the source strength E of the i-th point sound source on any converter transformer Si The first relationship;

[0035] The second relationship determination unit is used to determine the sound power value E of all converter transformers at the jth measurement point according to the first relationship. Fj and the source strength E of the i-th point sound source on any converter transformer Si The second relationship;

[0036] An inversion calculation unit is used to perform an inversion calculation according to the second relationship to determine the source strength E of the i-th point sound source on any converter transformer. Si .

[0037] Preferably, the first relationship determination unit constructs the source strength E of the i-th point sound source on any converter transformer. Si The corresponding sound power measurement value E k Fj The proportionality factor Bk ji ,include:

[0038]

[0039]

[0040]

[0041]

[0042]

[0043]

[0044] Among them, the proportionality coefficient B k ji represents the propagation coefficient from the i-th point sound source on the k-th converter transformer to the j-th measurement point; E Si is the source strength of the i-th point sound source on any converter transformer, L PSi is the corresponding source strength level; N measurement points are taken in the sound field formed by the noise radiation of the converter transformer group, E k Fj is the sound power of the i-th point sound source on the k-th converter transformer at the j-th measurement point, L k PFj is the corresponding sound level; A k ji is the attenuation ratio of the sound wave propagating from the i-th point sound source on the k-th converter transformer to the j-th measurement point, L k Aji is the corresponding attenuation level; W ref is the preset reference value.

[0045] Preferably, the first relationship includes:

[0046]

[0047] Among them, the value range of j is [1, N]; the value range of i is [1, M]; N is the total number of measurement points; and M is the total number of equivalent point sound sources of each converter transformer.

[0048] Preferably, the second relationship includes:

[0049]

[0050] Among them, the value range of j is [1, N]; the value range of i is [1, M]; N is the total number of measurement points; M is the total number of point sound sources equivalent to each converter transformer; and L is the total number of converter transformers.

[0051] Preferably, the inverse calculation unit performs inverse calculation according to the second relationship to determine the source strength E of the i-th point sound source on any converter transformer. Si ,include:

[0052]

[0053]

[0054]

[0055]

[0056] Among them, the value range of j is [1, N]; the value range of i is [1, M]; N is the total number of measurement points; M is the total number of equivalent point sound sources for each converter transformer; L is the total number of converter transformers; the number of measurement points N is greater than or equal to the number of equivalent sound source points M; when N = M, MB is a square matrix, MB is reversible, and the equations are solved to obtain Thus, the source strength E of the i-th point sound source on any converter transformer is determined Si ; When N is greater than M, the least squares method is used to calculate Thus, the source strength E of the i-th point sound source on any converter transformer is determined Si .

[0057] The present invention provides a method and system for calculating the noise source strength of a converter transformer group. By establishing a multi-point sound source model, a numerical model is used to calculate the noise attenuation value from the equivalent point sound source of the converter transformer to a measuring point, noise measurement is performed near the converter transformer, and measurement values ​​of multiple measuring points are obtained. The source strength of the converter transformer is inferred by combining the noise attenuation value and the measurement value. The present invention can meet the correction requirements for the noise source strength in the noise map within the converter station, and solves the problem of the current lack of relevant methods for obtaining the source strength of the converter transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] A more complete understanding of exemplary embodiments of the present invention may be obtained by referring to the following drawings:

[0059] Figure 1 is a flow chart of a method 100 for calculating noise source strength of a converter transformer group according to an embodiment of the present invention;

[0060] Figure 2 A flowchart of applying a single-point sound source model to inversely calculate and verify the noise source strength of a converter transformer group according to an embodiment of the present invention;

[0061] Figure 3 is a layout diagram of a converter transformer group according to an embodiment of the present invention;

[0062] Figure 4 A single-point sound source distribution diagram of a converter transformer according to an embodiment of the present invention;

[0063] Figure 5 A converter station dimension diagram according to an embodiment of the present invention;

[0064] Figure 6 A distribution diagram of a single measurement point of a converter station according to an embodiment of the present invention;

[0065] Figure 7 A comparison diagram of the set value at the sound source point, the inversion value with background noise and the inversion value without background noise according to an embodiment of the present invention;

[0066] Figure 8 A flowchart of applying a multi-point sound source model to inversely calculate and verify the noise source strength of a converter transformer group according to an embodiment of the present invention;

[0067] Fig. 9 A schematic diagram of applying a multi-point sound source model to inversely calculate the noise source strength of a converter transformer group according to an embodiment of the present invention;

[0068] Fig.10 A multi-point sound source distribution diagram of a converter transformer group according to an embodiment of the present invention;

[0069] Fig.11 A distribution diagram of multiple measurement points in a converter station according to an embodiment of the present invention;

[0070] Fig.12 Comparison between set values ​​and inversion values ​​at a first group of sound source points according to an embodiment of the present invention;

[0071] Fig.13 A comparison between set values ​​and inversion values ​​at a second group of sound source points according to an embodiment of the present invention;

[0072] Fig.14 14 is a schematic diagram of the structure of a system 1400 for calculating the noise source strength of a converter transformer group according to an embodiment of the present invention. DETAILED DESCRIPTION

[0073] Now, exemplary embodiments of the present invention are described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, the same units / elements are marked with the same reference numerals.

[0074] Unless otherwise specified, the terms (including technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0075] Figure 1 FIG. 1 is a flow chart of a method 100 for calculating the noise source strength of a converter transformer group according to an embodiment of the present invention. Figure 1 As shown, the method for calculating the noise source strength of a converter transformer group provided by the embodiment of the present invention establishes a multi-point sound source model, uses a numerical model to calculate the noise attenuation value from the equivalent point sound source of the converter transformer to the measurement point, measures the noise near the converter transformer, obtains the measurement values ​​of multiple measurement points, and reversely infers the source strength of the converter transformer by combining the noise attenuation value and the measurement value. The method of the present invention can meet the correction requirements for the noise source strength in the noise map within the converter station, and solves the problem of the current lack of relevant methods for obtaining the source strength of the converter transformer. The method 100 for calculating the noise source strength of a converter transformer group provided by the embodiment of the present invention starts from step 101, establishes a simulation model of the converter transformer group in step 101, and determines the position of the measurement point and the position of the equivalent point sound source of each converter transformer based on the simulation model; wherein the source strengths of the point sound sources with the same relative position on each converter transformer are equal.

[0076] In the present invention, in order to calculate the source strength of the converter transformer, a simulation model of the converter transformer group is first established, and the position of the measurement point and the position of the equivalent point sound source of each converter transformer are determined based on the simulation model. Among them, the sound source characteristics of the converter transformer are equivalent to multiple point sound sources, and the parameters of the point sound source include sound power and spatial position, wherein the sound power is unknown and needs to be inferred through the sound field measurement value; the spatial position is known, and the spatial position includes absolute position and relative position, the absolute position is the actual position of the point sound source with reference to the converter station, and the relative position is the relative position of the point sound source relative to a specific point on the converter transformer. The sound source characteristics of each transformer in the converter transformer group are basically the same, the relative positions of the equivalent point sound sources of each converter transformer are the same, and the source strength of the point sound sources with the same relative positions of each converter transformer is the same. The sound field in the vicinity of the converter transformer mainly comes from the radiation noise of the converter transformer itself, and is basically not affected by the radiation noise of other power equipment in the converter station. When the source strength of the converter transformer is inferred by the sound field in the vicinity of the converter transformer, the radiation noise of other power equipment can be ignored. The sound field in the vicinity of the converter transformer is the result of the combined effect of each converter transformer. When calculating the radiated sound field of the converter transformer, the phase relationship between the point sound sources of the converter transformer and between the converter transformers is not considered, only the energy superposition is considered.

[0077] In step 102, a simulation calculation is performed based on the simulation model to obtain the sound level L of the i-th point sound source on the k-th converter transformer at the j-th measurement point. k PFj , and according to the sound level L k PFj Calculate the sound power measurement value E of the i-th point sound source on the k-th converter transformer at the j-th measurement point k Fj .

[0078] In the present invention, it is assumed that there are L converter transformers in the converter transformer group, each converter transformer can be equivalent to M point sound sources, and the point sound sources with the same relative position on each converter transformer have equal source strength. N measurement points are taken in the sound field formed by the noise radiation of the converter transformer group, and the sound power E of the i-th point sound source on the k-th converter transformer at the j-th measurement point can be obtained through simulation calculation. k Fj .

[0079] In step 103, the source strength E of the i-th point sound source on any converter transformer is constructed. Si The corresponding sound power measurement value E k Fj The proportionality factor B k ji , and based on the proportionality coefficient B k ji Determine the sound power measurement value E k Fj and the source strength E of the i-th point sound source on any converter transformer Si The first relationship.

[0080] Preferably, the source strength E of the i-th point sound source on any converter transformer is constructed as follows: Si The corresponding sound power measurement value E k Fj The proportionality factor B k ji ,include:

[0081]

[0082]

[0083]

[0084]

[0085]

[0086]

[0087] Among them, the proportionality coefficient B k ji represents the propagation coefficient from the i-th point sound source on the k-th converter transformer to the j-th measurement point; E Si is the source strength of the i-th point sound source on any converter transformer, L PSi is the corresponding source strength level; N measurement points are taken in the sound field formed by the noise radiation of the converter transformer group, E k Fj is the sound power of the i-th point sound source on the k-th converter transformer at the j-th measurement point, L k PFj is the corresponding sound level; A k ji is the attenuation ratio of the sound wave propagating from the i-th point sound source on the k-th converter transformer to the j-th measurement point, L k Aji is the corresponding attenuation level; W ref is the preset reference value.

[0088] Preferably, the first relationship includes:

[0089]

[0090] Among them, the value range of j is [1, N]; the value range of i is [1, M]; N is the total number of measurement points; and M is the total number of equivalent point sound sources of each converter transformer.

[0091] In the present invention, the source intensities of the point sound sources at the same relative positions on each converter transformer are equal, and E Si represents the source strength of the ith point sound source of any converter transformer, L PSi Indicates the corresponding source strength level; N measurement points are taken in the sound field formed by the noise radiation of the converter transformer group, E k Fj represents the sound power of the i-th point sound source on the k-th converter transformer at the j-th measurement point, L k PFj Indicates the corresponding sound level; A k ij It represents the attenuation ratio of the sound wave propagating from the i-th point sound source on the k-th converter transformer to the j-th measurement point, L k Aij Represents the corresponding attenuation level. The relationship between the above parameters can be expressed as:

[0092]

[0093]

[0094]

[0095]

[0096]

[0097] Among them, W ref is the preset reference value.

[0098] In the present invention, the sound level L of the i-th point sound source on the k-th converter transformer at the j-th measurement point is obtained by simulation calculation and measurement. k PFj , and based on the above relationship according to the sound level L k PFj Calculate the sound power measurement value E of the i-th point sound source on the k-th converter transformer at the j-th measurement point k Fj Based on the above relationship, the sound power measurement value E k Fj A can be calculated k ij and L k Aij .

[0099] To simplify the calculation, let B k ji For E Si With E k Fj The proportional coefficient between is the propagation coefficient from the i-th equivalent point sound source to the j-th sound measurement point in the k°th converter transformer, which is:

[0100]

[0101] Therefore, the sound power of all sound source points on the kth converter transformer at all measurement points is obtained as:

[0102]

[0103] In the above formula, the last matrix on the right side of the equation is the source strength of all M sound source points on the kth converter transformer; the first matrix on the left side of the equation is the sound power of all N measurement points near the converter transformer group.

[0104] In step 104, the acoustic power value E of all converter transformers at the jth measurement point is determined according to the first relationship. Fj and the source strength E of the i-th point sound source on any converter transformer Si The second relationship.

[0105] Preferably, the second relationship includes:

[0106]

[0107] Among them, the value range of j is [1,N]; the value range of i is [1,M]; N is the total number of measurement points; M is the total number of point sound sources equivalent to each converter transformer; and L is the total number of converter transformers.

[0108] In the present invention, the acoustic power of all converter transformers at the jth measurement point is E Fj , is the sum of the sound power of each converter transformer at the jth measurement point, and has the following relationship:

[0109]

[0110] Among them, B k ji is the propagation coefficient from the ith equivalent point sound source in the kth converter transformer to the jth sound measurement point, which includes geometric attenuation, ground effect and air attenuation, and can be calculated according to the ISO9613 model.

[0111] In step 105, an inverse calculation is performed according to the second relationship to determine the source strength E of the i-th point sound source on any converter transformer. Si .

[0112] Preferably, the inverse calculation is performed according to the second relationship to determine the source strength E of the i-th point sound source on any converter transformer. Si ,include:

[0113]

[0114]

[0115]

[0116]

[0117] Among them, the value range of j is [1, N]; the value range of i is [1, M]; N is the total number of measurement points; M is the total number of equivalent point sound sources for each converter transformer; L is the total number of converter transformers; the number of measurement points N is greater than or equal to the number of equivalent sound source points M; when N = M, MB is a square matrix, MB is reversible, and the equations are solved to obtain Thus, the source strength E of the i-th point sound source on any converter transformer is determined Si ; When N is greater than M, the least squares method is used to calculate Thus, the source strength E of the i-th point sound source on any converter transformer is determined Si .

[0118] In the present invention, it is assumed that:

[0119]

[0120]

[0121]

[0122] The matrix MB can be calculated according to the ISO9613 model, based on the acoustic environment of the converter station and the spatial positions of the equivalent sound source points and the sound field measurement points.

[0123] In the present invention, the E of the area near the converter transformer is obtained by actual measurement. Fj , and select the measurement points at appropriate locations so that the number of measurement points is greater than or equal to the equivalent sound source points. When the number is the same, MB is a square matrix, select the appropriate measurement point positions, make MB reversible, and calculate it by the following formula Thus, the source strength E of the i-th point sound source on any converter transformer is obtained: Si ,include:

[0124]

[0125] Where, MB-1 is the inverse matrix of MB. If the number of measurement points is greater than the number of equivalent sound source points, the least squares method is used to calculate Thus, the source strength E of the i-th point sound source on any converter transformer is determined Si .

[0126] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art.

[0127] like Figure 2 As shown, the steps of calculating and verifying the noise source strength of the converter transformer group using the equivalent point sound source model in the embodiment of the present invention include:

[0128] Step 1: Create simulation models of substations, buildings, etc. in the SwallowSound software and input the sound source information (converter transformers numbered 1-6).

[0129] The single point sound source model is to Figure 3 The noise radiated by each converter transformer in the converter transformer group shown is regarded as the result of radiation from a point sound source. The point sound source is 4m above the ground and is located at the center of the converter transformer. The total sound power of each converter transformer sound source is set to 88dB. The distribution of the single point sound source of the converter transformer is as follows: Figure 4 As shown. The source strength of each converter transformer in the converter transformer group is the same, and its initial setting value is L PSi .

[0130] Step 2: Use simulation software to predict and solve the calculation to obtain the predicted value of each measurement point and the sound source contribution value L k PFj and noise attenuation value L k Aij , the above information is recorded in the internal object attribute variables of the simulation software.

[0131] In the SwallowSound software, 11 measurement points are set around the converter station (cross layout), numbered from left to right and from top to bottom. The measurement points are distributed as follows: Figure 5 As shown. Among them, measurement point 6 ～ 11 is parallel to the front of the converter transformer and 9m away from the center of the converter transformer; measuring point 1 ～ 5 is parallel to the firewall, the height of each measuring point is 4m, and the distance between each measuring point is 10m.

[0132] Step 3: In the numerical simulation experiment, add 6 converter transformer sound sources (numbered 7-12), such as Figure 6 As shown. The virtual measurement value E of the measurement point is obtained by simulation operation. Fj .

[0133] The reason for adding the sound source is to simulate the situation that the measurement point is also affected by the noise of other converter transformers in actual situations, so as to improve the authenticity of the virtual measurement value.

[0134] Step 4: Combine the virtual measurement value and the sound source attenuation value to solve the inversion equation The inversion values ​​at 11 sound source points (with background noise) are obtained. The predicted values ​​are used to inversely solve the converter transformer source strength, and the inversion values ​​at 11 sound source points (without background noise) are obtained. The inversion values ​​at the sound source points with and without background noise are compared with the sound source set values.

[0135] from Figure 7 Comparison of the inversion values ​​with and without background noise at the sound source point and the sound source set value shows that the inversion value without background noise at the sound source point is the same as the set value, verifying the correctness of the inversion equation. The error between the inversion value with background noise at the sound source point and the set value is less than 0.8dB, and the influence of the interfering sound source on the measurement point can be ignored.

[0136] The process of applying the multi-point sound source model to inversely calculate the noise source strength of the converter transformer group and verifying it is as follows: Figure 8 As shown, the principle is as Fig. 9 As shown, specifically, the process of inverse calculation of the noise source strength of the converter transformer group includes:

[0137] Step 1: Establish a multi-point sound source model in the SwallowSound software, and use the coordinates of buildings, sound sources, and measurement points as input data for numerical simulation of noise grid maps. The multi-point sound source model is the result of treating the noise radiated by each converter transformer in the converter transformer group as equivalent to the radiation of multiple point sound sources.

[0138] The converter transformer in a certain unit's converter station is taken as the research object. According to the real measured GIS data (substation, building), a multi-point acoustic model is established which conforms to the distribution characteristics of the converter station and the sound propagation law of the converter transformer.

[0139] The front surface and the upper surface of the converter transformer are simplified into single point sound sources, located at the geometric center of the two surfaces of the converter transformer. The sound power of the upper surface sound source point is set to 88dB, the height is 4m above the ground, and the sound power of the front surface sound source point is set to 85dB, the height is 2m above the ground. The converter transformer group is simplified to an equivalent multi-point sound source distribution as shown in Fig.10 shown.

[0140] Step 2: Use the noise simulation software SwallowSound to perform prediction and solution calculations to obtain the predicted values ​​of the positions of each measurement point, the sound source contribution value of each measurement point, and the sound source attenuation value as shown in Table 1. The above information is recorded in the object attribute variables inside the simulation software.

[0141] Table 1 Predicted values ​​of measurement point locations

[0142] experiment Measuring point location Predicted value (dB) 1 1 53.222 2 2 54.779 3 3 57.33 4 4 59.772 5 5 63.859 6 6 56.009 7 7 56.9 8 8 52.188 9 9 48.208

[0143] Assuming that a large converter transformer is regarded as M point sound sources (the sound pressure level of each point sound source is different), in order to invert the M point sound sources, a fixed-point measurement method is used to obtain the measured values ​​of at least M measurement points.

[0144] Assume that there are L converter transformers (each converter transformer has the same model), simplify one converter transformer into M point sound sources, and the sound sources at the same position in the L converter transformers have the same point sound source characteristics and the same sound pressure level. They are divided into the same group of point sound sources, that is, there are L groups of point sound sources in total. The point sound sources in the same group have the same source strength, and the initial setting value of the source strength is L. PSi ;

[0145] The measurement point locations are distributed as follows: Fig.11 As shown, measuring points 1-5 are parallel to the firewall, and the distance between measuring points is 10m; measuring points 6-8 are parallel to the front of the converter transformer, 9m away from the center of the converter transformer, the distance between measuring points 6 and 7 is 50m, the distance between measuring points 7-9 is 15m each, and the height of each measuring point is 2m.

[0146] Step 3: Randomly select two measurement points from measurement points 1-5 or 3, 6-9, combine the predicted value with the sound source attenuation value, and solve the inverse equation group After screening, 10 groups of converter transformer source strengths were obtained, such as Fig.12 and 13 shown.

[0147] like Fig.12 and Fig.13 As shown in Figure 5, the inversion values ​​at the sound source points in Experiments 5, 6, and 9 are closer to the set values ​​at the sound source points. Therefore, in field measurements, the location of the optimal measurement point group can be obtained through simulation experiments. The deployment location of the measurement point group has a certain influence on the inversion calculation of the converter transformer source strength. In actual measurements, the measurement point group should be placed parallel to the sound source point group, and try to avoid the distance between the two measurement points being too small or too large.

[0148] The present invention establishes a multi-point sound source model and uses a numerical model to calculate the noise attenuation value from the equivalent point sound source of the converter transformer to the measurement point. Noise measurement is performed near the converter transformer to obtain measurement values ​​of multiple measurement points, and the source strength of the converter transformer is inferred by combining the noise attenuation value and the measurement value. The present invention meets the correction requirements for the noise source strength in the noise map within the converter station and makes up for the current lack of a method for obtaining the source strength of the converter transformer.

[0149] Fig.14 FIG. 1 is a schematic diagram of a system 1400 for calculating the noise source strength of a converter transformer group according to an embodiment of the present invention. Fig.14 As shown, the system 1400 for calculating the noise source strength of a converter transformer group provided in an embodiment of the present invention includes: a simulation model establishing unit 1401, a sound power measurement value acquiring unit 1402, a first relationship determining unit 1403, a second relationship determining unit 1404 and an inversion calculation unit 1405.

[0150] Preferably, the simulation model establishing unit 1401 is used to establish a simulation model of the converter transformer group, and determine the position of the measurement point and the position of the equivalent point sound source of each converter transformer based on the simulation model; wherein the source intensities of the point sound sources with the same relative position on each converter transformer are equal.

[0151] Preferably, the sound power measurement value acquisition unit 1402 is used to perform simulation calculation based on the simulation model to obtain the sound level L of the i-th point sound source on the k-th converter transformer at the j-th measurement point. k PFj , and according to the sound level L k PFj Calculate the sound power measurement value E of the i-th point sound source on the k-th converter transformer at the j-th measurement point k Fj .

[0152] Preferably, the first relationship determination unit 1403 is used to construct the source strength E of the i-th point sound source on any converter transformer. Si The corresponding sound power measurement value E k Fj The proportionality factor B k ji , and based on the proportionality coefficient B k ji Determine the sound power measurement value E k Fj and the source strength E of the i-th point sound source on any converter transformer Si The first relationship.

[0153] Preferably, the first relationship determination unit 1403 constructs the source strength E of the i-th point sound source on any converter transformer. Si The corresponding sound power measurement value E k Fj The proportionality factor B k ji ,include:

[0154]

[0155]

[0156]

[0157]

[0158]

[0159]

[0160] Among them, the proportionality coefficient B k ji represents the propagation coefficient from the i-th point sound source on the k-th converter transformer to the j-th measurement point; E Si is the source strength of the i-th point sound source on any converter transformer, L PSi is the corresponding source strength level; N measurement points are taken in the sound field formed by the noise radiation of the converter transformer group, E k Fj is the sound power of the i-th point sound source on the k-th converter transformer at the j-th measurement point, L k PFj is the corresponding sound level; A k ji is the attenuation ratio of the sound wave propagating from the i-th point sound source on the k-th converter transformer to the j-th measurement point, L k Aji is the corresponding attenuation level; Wref is the preset reference value.

[0161] Preferably, the first relationship includes:

[0162]

[0163] Among them, the value range of j is [1, N]; the value range of i is [1, M]; N is the total number of measurement points; and M is the total number of equivalent point sound sources of each converter transformer.

[0164] Preferably, the second relationship determination unit 1404 is used to determine the sound power value E of all converter transformers at the jth measurement point according to the first relationship. Fj and the source strength E of the i-th point sound source on any converter transformer Si The second relationship.

[0165] Preferably, the second relationship includes:

[0166]

[0167] Among them, the value range of j is [1, N]; the value range of i is [1, M]; N is the total number of measurement points; M is the total number of point sound sources equivalent to each converter transformer; and L is the total number of converter transformers.

[0168] Preferably, the inversion calculation unit 1405 is used to perform inversion calculation according to the second relationship to determine the source strength E of the i-th point sound source on any converter transformer. Si .

[0169] Preferably, the inverse calculation unit 1405 performs inverse calculation according to the second relationship to determine the source strength E of the i-th point sound source on any converter transformer. Si ,include:

[0170]

[0171]

[0172]

[0173]

[0174] Among them, the value range of j is [1, N]; the value range of i is [1, M]; N is the total number of measurement points; M is the total number of equivalent point sound sources for each converter transformer; L is the total number of converter transformers; the number of measurement points N is greater than or equal to the number of equivalent sound source points M; when N = M, MB is a square matrix, MB is reversible, and the equations are solved to obtain Thus, the source strength E of the i-th point sound source on any converter transformer is determined Si ; When N is greater than M, the least squares method is used to calculate Thus, the source strength E of the i-th point sound source on any converter transformer is determined Si .

[0175] The system 1400 for calculating the noise source strength of a converter transformer group in an embodiment of the present invention corresponds to the method 100 for calculating the noise source strength of a converter transformer group in another embodiment of the present invention, and will not be described in detail herein.

[0176] The invention has been described above with reference to a few embodiments. However, it is readily apparent to a person skilled in the art that other embodiments than the ones disclosed above are equally within the scope of the invention, as defined by the appended patent claims.

[0177] Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a / said / the [means, components, etc.]" are to be openly interpreted as at least one instance of the means, components, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not necessarily have to be performed in the exact order disclosed, unless explicitly stated otherwise.

[0178] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0179] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0180] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0181] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0182] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for calculating the noise source strength of a converter transformer group, characterized in that: The method comprises: Establishing a simulation model of the converter transformer group, and determining the position of the measurement point and the position of the equivalent point sound source of each converter transformer based on the simulation model; wherein the source strengths of the point sound sources at the same relative position on each converter transformer are equal; A simulation calculation is performed based on the simulation model to obtain the sound level L of the i-th point sound source on the k-th converter transformer at the j-th measurement point. k PFj , and according to the sound level L k PFj Calculate the sound power measurement value E of the i-th point sound source on the k-th converter transformer at the j-th measurement point k Fj ; Construct the source strength E of the i-th point sound source on any converter transformer Si The corresponding sound power measurement value E k Fj The proportionality factor B k ji , and based on the proportionality coefficient B k ji Determine the sound power measurement value E k Fj and the source strength E of the i-th point sound source on any converter transformer Si The first relationship; Determine the sound power value E of all converter transformers at the jth measurement point according to the first relationship Fj and the source strength E of the i-th point sound source on any converter transformer Si The second relationship; According to the second relationship, an inverse calculation is performed to determine the source strength E of the i-th point sound source on any converter transformer. Si .

2. The method according to claim 1, characterized in that The source strength E of the i-th point sound source on any converter transformer is constructed as Si The corresponding sound power measurement value E k Fj The proportionality factor B k ji , include: Among them, the proportionality coefficient B k ji represents the propagation coefficient from the i-th point sound source on the k-th converter transformer to the j-th measurement point; E Si is the source strength of the i-th point sound source on any converter transformer, L PSi is the corresponding source strength level; N measurement points are taken in the sound field formed by the noise radiation of the converter transformer group, E k Fj is the sound power of the i-th point sound source on the k-th converter transformer at the j-th measurement point, L k PFj is the corresponding sound level; A k ji is the attenuation ratio of the sound wave propagating from the i-th point sound source on the k-th converter transformer to the j-th measurement point, L k Aji is the corresponding attenuation level; W ref is the preset reference value.

3. The method according to claim 1, characterized in that: Based on the proportionality factor B k ji Determine the sound power measurement value E k Fj and the source strength E of the i-th point sound source on any converter transformer Si The first relationship, the first relationship, include: Among them, the value range of j is [1, N]; the value range of i is [1, M]; N is the total number of measurement points; and M is the total number of equivalent point sound sources of each converter transformer.

4. The method according to claim 1, characterized in that: Determine the sound power value E of all converter transformers at the jth measurement point according to the first relationship Fj and the source strength E of the i-th point sound source on any converter transformer Si The second relationship, the second relationship, include: Among them, the value range of j is [1,N]; the value range of i is [1,M]; N is the total number of measurement points; M is the total number of point sound sources equivalent to each converter transformer; and L is the total number of converter transformers.

5. The method according to claim 1, characterized in that The inverse calculation is performed according to the second relationship to determine the source strength E of the i-th point sound source on any converter transformer. Si ,include: Among them, the value range of j is [1, N]; the value range of i is [1, M]; N is the total number of measurement points; M is the total number of equivalent point sound sources for each converter transformer; L is the total number of converter transformers; the number of measurement points N is greater than or equal to the number of equivalent sound source points M; when N = M, MB is a square matrix, MB is reversible, and the equations are solved to obtain Thus, the source strength E of the i-th point sound source on any converter transformer is determined Si ; When N is greater than M, the least squares method is used to calculate Thus, the source strength E of the i-th point sound source on any converter transformer is determined Si .

6. A system for calculating the noise source strength of a converter transformer group, characterized in that: The system comprises: A simulation model building unit is used to build a simulation model of the converter transformer group, and determine the position of the measurement point and the position of the equivalent point sound source of each converter transformer based on the simulation model; wherein the source strengths of the point sound sources with the same relative position on each converter transformer are equal; The sound power measurement value acquisition unit is used to perform simulation calculation based on the simulation model to obtain the sound level L of the i-th point sound source on the k-th converter transformer at the j-th measurement point. k PFj , and according to the sound level L k PFj Calculate the sound power measurement value E of the i-th point sound source on the k-th converter transformer at the j-th measurement point k Fj ; The first relationship determination unit is used to construct the source strength E of the i-th point sound source on any converter transformer. Si The corresponding sound power measurement value E k Fj The proportionality factor B k ji , and based on the proportionality coefficient B k ji Determine the sound power measurement value E k Fj and the source strength E of the i-th point sound source on any converter transformer Si The first relationship; The second relationship determination unit is used to determine the sound power value E of all converter transformers at the jth measurement point according to the first relationship. Fj and the source strength E of the i-th point sound source on any converter transformer Si The second relationship; An inversion calculation unit is used to perform an inversion calculation according to the second relationship to determine the source strength E of the i-th point sound source on any converter transformer. Si .

7. The system according to claim 6, characterized in that The first relationship determination unit constructs the source strength E of the i-th point sound source on any converter transformer Si The corresponding sound power measurement value E k Fj The proportionality factor B k ji , include: Among them, the proportionality coefficient B k ji represents the propagation coefficient from the i-th point sound source on the k-th converter transformer to the j-th measurement point; E Si is the source strength of the i-th point sound source on any converter transformer, L PSi is the corresponding source strength level; N measurement points are taken in the sound field formed by the noise radiation of the converter transformer group, E k Fj is the sound power of the i-th point sound source on the k-th converter transformer at the j-th measurement point, L k PFj is the corresponding sound level; A k ji is the attenuation ratio of the sound wave propagating from the i-th point sound source on the k-th converter transformer to the j-th measurement point, L k Aji is the corresponding attenuation level; W ref is the preset reference value.

8. The system according to claim 6, characterized in that The first relationship determination unit is based on the proportionality coefficient B k ji Determine the sound power measurement value E k Fj and the source strength E of the i-th point sound source on any converter transformer Si The first relationship, the first relationship, include: Among them, the value range of j is [1, N]; the value range of i is [1, M]; N is the total number of measurement points; and M is the total number of equivalent point sound sources of each converter transformer.

9. The system according to claim 6, characterized in that The second relationship determination unit determines the sound power value E of all converter transformers at the jth measurement point according to the first relationship. Fj and the source strength E of the i-th point sound source on any converter transformer Si The second relationship, the second relationship, include: Among them, the value range of j is [1,N]; the value range of i is [1,M]; N is the total number of measurement points; M is the total number of point sound sources equivalent to each converter transformer; and L is the total number of converter transformers.

10. The system according to claim 6, characterized in that The inverse calculation unit performs inverse calculation according to the second relationship to determine the source strength E of the i-th point sound source on any converter transformer Si ,include: Wherein, the value range of j is [1, N]; the value range of i is [1, M]; N is the total number of measurement points; M is the total number of point sound sources equivalent to each converter transformer; L is the total number of converter transformers; The number of measurement points N is greater than or equal to the equivalent number of sound source points M; when N = M, MB is a square matrix, MB is reversible, and the equations are solved to obtain Thus, the source strength E of the i-th point sound source on any converter transformer is determined Si ; When N is greater than M, the least squares method is used to calculate Thus, the source strength E of the i-th point sound source on any converter transformer is determined Si .

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