Noise measurement method and device for three-phase direct current commutation bridge arm reactor

Abstract

The invention discloses a noise measurement method and device for a three-phase direct current commutation bridge arm reactor. The method comprises the steps of calculating a plurality of sub-condition current sequences under laboratory loading according to a discrete current frequency component under an actual operation condition of the bridge arm reactor; loading a plurality of sub-working-condition current sequences in a laboratory for the bridge arm reactor, and measuring a plurality of sub-working-condition noise magnitudes of the bridge arm reactor when the sub-working conditions are loaded; and carrying out superposition calculation on the noise magnitudes of the plurality of sub-working conditions, and determining the noise magnitude of the bridge arm reactor under the actual operation working condition.

Description

Technical Field

[0001] The present invention relates to the technical field of acoustic performance evaluation of dry-type air-core reactors, and more specifically, to a noise measurement method and device for a three-phase direct current commutation bridge arm reactor. Background Art

[0002] The arm reactor is a key device in the AC / DC converter. It adopts a dry hollow structure, with the characteristics of large current, no iron core, and air as the magnetic medium. During operation, the arm reactor flows through the winding, which in turn bears the magnetic field force on the winding. This magnetic field force drives the structure to produce mechanical vibration, and finally produces noise pollution. The arm reactor has become one of the main noise sources in the new power system, and its acoustic performance needs to be evaluated and measured in advance.

[0003] The bridge arm reactor will flow through both AC and DC components in the operating current, and the existing laboratory cannot simulate its actual current components. Based on the principle of reactor noise generation, the noise frequency is closely related to the loading current frequency component, so the frequency range of the noise measured in the laboratory is smaller than the noise in the actual operating state, resulting in a low noise value. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a noise measurement method and device for a three-phase DC commutation bridge arm reactor.

[0005] According to one aspect of the present invention, a noise measurement method for a three-phase DC commutation bridge arm reactor is provided, comprising:

[0006] According to the discrete current frequency components of the bridge arm reactor under actual operating conditions, multiple sub-condition current sequences under laboratory loading are calculated;

[0007] Multiple sub-operating condition current sequences are loaded on the bridge arm reactor in the laboratory, and multiple sub-operating condition noise levels of the bridge arm reactor when the sub-operating conditions are loaded are measured;

[0008] The noise levels of multiple sub-operating conditions are superimposed and calculated to determine the noise level of the bridge arm reactor under the actual operating condition.

[0009] Optionally, according to the discrete current frequency components of the bridge arm reactor under the actual operating condition, multiple sub-condition current sequences under laboratory loading are calculated, including:

[0010] The discrete current frequency components of the bridge arm reactor under actual operating conditions are expressed as a current amplitude sequence and a frequency value sequence;

[0011] According to the current amplitude sequence and the frequency value sequence, the sub-operating condition current amplitudes and the corresponding sub-operating condition current frequencies of multiple sub-operating condition current sequences under laboratory loading are calculated.

[0012] Optionally, according to the current amplitude sequence and the frequency value sequence, sub-operating condition current amplitudes and corresponding sub-operating condition current frequencies of multiple sub-operating condition current sequences under laboratory loading are calculated, including:

[0013] The amplitude and frequency of the current square spectrum are calculated according to the current amplitude sequence and frequency value sequence of the current spectrum of the actual working condition of the bridge arm reactor;

[0014] According to the amplitude and frequency of the current square spectrum, a finite number of sequences and their corresponding spectra are selected according to specific time costs;

[0015] According to a finite number of sequences and their corresponding frequencies, the sub-condition current amplitudes and corresponding sub-condition current frequencies of multiple sub-condition current sequences under laboratory loading are calculated.

[0016] Optionally, according to the amplitude and frequency of the current square spectrum, a finite number of sequences and their corresponding spectra are selected according to a specific time cost, including:

[0017] According to the amplitude and frequency of the current square spectrum and the proportion of the amplitude of each current square spectrum in the total spectrum, a finite number of sequences and their corresponding spectra are selected according to the proportion.

[0018] Optionally, the frequency of the current square spectrum is 50n Hz, where n is a sequence number;

[0019] The calculation formula for the amplitude of the current square spectrum is:

[0020]

[0021] Wherein, n is the amplitude sequence number of the current square spectrum; ISq[n] is the value of the nth element in the amplitude sequence of the current square spectrum; m is the current amplitude sequence number; I[m] is the value of the mth element in the current amplitude sequence of the actual operating condition.

[0022] Optionally, the sub-condition current amplitude I sub _j and the corresponding sub-operating current frequency f sub The calculation formula of _j is:

[0023]

[0024] f sub _j=fSq[j] / 2

[0025] Where ISq[j] and fSq[j] are finite sequences and their corresponding frequencies respectively.

[0026] Optionally, the calculation formula for the noise level of the bridge arm reactor under actual operating conditions is:

[0027]

[0028] Wherein, L is the noise level of the bridge arm reactor under the actual operating condition; N is the total number of sub-condition current sequences; L_j is the noise level of the bridge arm reactor measured under the sub-condition current loading numbered j.

[0029] According to another aspect of the present invention, a noise measurement device for a three-phase DC commutation bridge arm reactor is provided, comprising:

[0030] A calculation module is used to calculate multiple sub-condition current sequences under laboratory loading according to the discrete current frequency components of the bridge arm reactor under actual operating conditions;

[0031] A recording module is used to load multiple sub-operating condition current sequences on the bridge arm reactor in a laboratory and measure the noise levels of multiple sub-operating conditions of the bridge arm reactor when the sub-operating conditions are loaded;

[0032] The determination module is used to perform superposition calculation on the noise levels of multiple sub-operating conditions to determine the noise level of the bridge arm reactor under the actual operating condition.

[0033] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the storage medium stores a computer program, and the computer program is used to execute the method described in any one of the above aspects of the present invention.

[0034] According to another aspect of the present invention, an electronic device is provided, comprising: a processor; a memory for storing instructions executable by the processor; the processor is configured to read the executable instructions from the memory and execute the instructions to implement the method described in any one of the above aspects of the present invention.

[0035] Therefore, the present invention calculates the sub-operating condition sequence that can be loaded and operated in the laboratory based on the current components in the actual operation of the bridge arm reactor. The noise data of the bridge arm reactor under each sub-operating condition is measured in the laboratory, and finally the data is calculated to obtain the noise value of the bridge arm reactor under the actual working condition. The present invention reduces the difficulty of test loading by decomposing the operating condition of the bridge arm reactor; the measured test results can gradually improve the accuracy as the number of sub-operating conditions increases, ensuring the accuracy of the test results and the feasibility of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] A more complete understanding of exemplary embodiments of the present invention may be obtained by referring to the following drawings:

[0037] Figure 1 It is a flow chart of a noise measurement method of a three-phase DC commutation bridge arm reactor provided by an exemplary embodiment of the present invention;

[0038] Figure 2 It is a structural schematic diagram of a noise measuring device for a three-phase DC commutation bridge arm reactor provided by an exemplary embodiment of the present invention;

[0039] Figure 3 This is a structure of an electronic device provided by an exemplary embodiment of the present invention. DETAILED DESCRIPTION

[0040] Below, the exemplary embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments of the present invention, and it should be understood that the present invention is not limited to the exemplary embodiments described here.

[0041] It should be noted that the relative arrangement of components and steps, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

[0042] Those skilled in the art can understand that the terms "first" and "second" in the embodiments of the present invention are only used to distinguish different steps, devices or modules, etc., and neither represent any specific technical meaning nor indicate the necessary logical order between them.

[0043] It should also be understood that, in the embodiments of the present invention, “plurality” may refer to two or more than two, and “at least one” may refer to one, two or more than two.

[0044] It should also be understood that any component, data or structure mentioned in the embodiments of the present invention can generally be understood as one or more, unless explicitly limited or otherwise indicated in the context.

[0045] In addition, the term "and / or" in the present invention is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects before and after are in an "or" relationship.

[0046] It should also be understood that the description of the various embodiments of the present invention focuses on the differences between the various embodiments, and the same or similar aspects thereof can be referenced to each other, and for the sake of brevity, they will not be described one by one.

[0047] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0048] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0049] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0050] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0051] Embodiments of the present invention can be applied to electronic devices such as terminal devices, computer systems, servers, etc., which can operate with many other general or special computing system environments or configurations. Examples of well-known terminal devices, computing systems, environments and / or configurations suitable for use with electronic devices such as terminal devices, computer systems, servers, etc. include, but are not limited to: personal computer systems, server computer systems, thin clients, thick clients, handheld or laptop devices, microprocessor-based systems, set-top boxes, programmable consumer electronics, network personal computers, small computer systems, large computer systems, and distributed cloud computing technology environments including any of the above systems, etc.

[0052] Electronic devices such as terminal devices, computer systems, servers, etc. can be described in the general context of computer system executable instructions (such as program modules) executed by computer systems. Generally, program modules can include routines, programs, object programs, components, logic, data structures, etc., which perform specific tasks or implement specific abstract data types. Computer systems / servers can be implemented in a distributed cloud computing environment, where tasks are performed by remote processing devices linked through a communication network. In a distributed cloud computing environment, program modules can be located on local or remote computing system storage media including storage devices.

[0053] Exemplary Methods

[0054] Figure 1 1 is a flow chart of a noise measurement method for a three-phase DC commutation bridge arm reactor provided by an exemplary embodiment of the present invention. This embodiment can be applied to electronic devices, such as Figure 1 As shown, the noise measurement method 100 of the three-phase DC commutation bridge arm reactor includes the following steps:

[0055] Step 101, calculating a plurality of sub-operating condition current sequences under laboratory loading according to discrete current frequency components of the bridge arm reactor under actual operating conditions;

[0056] Step 102, loading a plurality of sub-operating condition current sequences on the bridge arm reactor in a laboratory respectively, and measuring a plurality of sub-operating condition noise levels of the bridge arm reactor when the sub-operating conditions are loaded;

[0057] Step 103, superimposing and calculating the noise levels of multiple sub-operating conditions to determine the noise level of the bridge arm reactor under the actual operating condition.

[0058] Specifically, the laboratory noise measurement value of the bridge arm inductor is lower than the actual operation noise because the bridge arm inductor cannot be loaded with the complete current frequency component, and the bridge arm inductor cannot generate noise equivalent to that in actual operation in the laboratory.

[0059] Since the noise frequency of the bridge arm reactor is not in one-to-one correspondence with the current frequency, the two need to be calculated based on the correlation between the physical quantities of current-magnetic field force-vibration-noise.

[0060] The purpose of the present invention is to calculate a sequence of sub-operating conditions that can be loaded and operated in a laboratory based on the current components (called actual operating conditions) in the actual operation of the bridge arm reactor. The noise data of the bridge arm reactor under each sub-operating condition is measured in the laboratory, and finally the data is calculated to obtain the noise value of the bridge arm reactor under the actual operating condition. This method can realize the accurate noise measurement of the bridge arm reactor under the operating condition in the load laboratory. The actual operating condition of the bridge arm reactor is not a time domain function form of a given current, but usually a given discrete current spectrum, that is, the current amplitude of each frequency domain component and its corresponding frequency point value.

[0061] The discrete current spectrum of the bridge arm reactor under actual operating conditions is represented as a current amplitude sequence I[n] and a frequency value sequence f[n]. Since the power grid frequency is 50 Hz, the discrete frequency point value of the bridge arm reactor current spectrum is a positive integer multiple of 50 Hz, and f[n] can be represented as f[n] = 50n Hz, where n = 0, 1, 2, ... represents the harmonic order.

[0062] A method for testing noise of a DC commutation bridge arm reactor comprises the following steps:

[0063] 1. For a given current amplitude sequence I[n] and frequency value sequence f[n] of the actual operating current spectrum of the bridge arm reactor, calculate the current amplitude I[n] of multiple sub-operating conditions under laboratory loading. sub _j and its corresponding current frequency f sub _j, where j = 1, 2, ... represents the sub-condition sequence number;

[0064] The calculation method is as follows:

[0065] a. Calculate the amplitude ISq[n] and frequency fSq[n] of the current square spectrum according to the current amplitude sequence I[n] and frequency value sequence f[n] of the actual working condition current spectrum of the bridge arm reactor;

[0066] Where, fSq[n]=50n Hz;

[0067] Among them, ISq[n] is calculated by the self-convolution and autocorrelation of I[n], and the formula is

[0068]

[0069] b. According to the amplitude of the current square spectrum ISq[n] and its corresponding frequency fSq[n], select a finite number of sequences according to the specific time cost. The selection method is to select the top 5 sequences ISq[j] and their corresponding spectrum fSq[j] according to the proportion of each ISq[n] in the total spectrum;

[0070] c. According to ISq_i and f_i, calculate the current amplitude I of multiple sub-conditions in the laboratory according to the following formula sub _j and its corresponding current frequency f sub _j:

[0071]

[0072] f sub _j=fSq[j] / 2

[0073] 2. Load the bridge arm reactor with each sub-condition current amplitude I in the laboratory sub _j and its corresponding current frequency f sub _j, and measure the noise level L_j of the bridge arm reactor under the loading sub-condition;

[0074] 3. Based on the measured noise levels L_j of all sub-operating conditions, perform superposition calculation to obtain the noise level L of the bridge arm reactor under the actual operating condition;

[0075] The superposition of noise levels is calculated as follows:

[0076]

[0077] The noise level referred to in the above steps can be selected as sound pressure level or sound power level according to the needs, which has no effect on the calculation steps and formulas used.

[0078] The basis for decomposing the actual working condition is the spectrum of the square of the current, and the calculation method uses convolution and correlation operations. Because the magnetic field force is directly related to the square of the current rather than the current itself; the essence of decomposing the actual working condition is to decompose the magnetic field force on the bridge arm reactor, so that the bridge arm reactor only bears a single frequency of magnetic field force in each sub-condition.

[0079] During the test, the spectrum of the squared current is first obtained through convolution and correlation operations based on the current spectrum of the actual operating condition of the bridge arm reactor. Then, the sub-operating condition current amplitude and frequency sequence are calculated based on the spectrum. Each sub-operating condition is applied to the reactor in turn. At the same time, the sub-operating condition noise level of the bridge arm reactor is measured in the laboratory. Finally, the noise levels of each sub-operating condition are superimposed to obtain the required capacitor radiated sound power under multi-frequency loading.

[0080] Table 1 Relationship between actual working condition current spectrum, current square spectrum and sub-working condition current amplitude frequency

[0081]

[0082]

[0083] The bridge arm reactors are loaded with the current amplitudes and frequencies listed in the sub-conditions 1 to 5 decomposed in the above table, and the sound power of the reactors is measured at the same time. The test results are shown in Table 2. The total sound power obtained by superimposing the noise sound power levels under each sub-condition in the table is 71.3dB(A).

[0084] Table 2 Noise sound power under sub-conditions

[0085] Noise frequency / Hz Sound power / dB(A) Subcase 1 50 57.4 Subcase 2 200 63.5 Subcase 3 250 64.9 Subcase 4 300 65.3 Subcase 5 350 66.3

[0086] The test comparison results of three bridge arm reactors using the above method are shown in Table 3. From the data in the table, it can be seen that the bridge arm reactor noise measurement method of the present invention can obtain a higher accuracy with an error of 3-4 dB. For actual reactors, only a limited number of sub-operating condition sequences can be selected, usually 5, and some parts are still ignored, which is the main reason for the error of this method.

[0087] Table 3 Comparison of single frequency superposition test results and direct loading test

[0088]

[0089]

[0090] Therefore, the present invention calculates the sub-operating condition sequence that can be loaded and operated in the laboratory based on the current components in the actual operation of the bridge arm reactor. The noise data of the bridge arm reactor under each sub-operating condition is measured in the laboratory, and finally the data is calculated to obtain the noise value of the bridge arm reactor under the actual working condition. The present invention reduces the difficulty of test loading by decomposing the operating condition of the bridge arm reactor; the measured test results can gradually improve the accuracy as the number of sub-operating conditions increases, ensuring the accuracy of the test results and the feasibility of the test.

[0091] Exemplary Devices

[0092] Figure 2 FIG. 1 is a schematic diagram of a noise measurement device for a three-phase DC commutation bridge arm reactor provided by an exemplary embodiment of the present invention. Figure 2 As shown, the device 200 includes:

[0093] A calculation module 210 is used to calculate a plurality of sub-operating condition current sequences under laboratory loading according to discrete current frequency components of the bridge arm reactor under actual operating conditions;

[0094] The recording module 220 is used to load multiple sub-operating condition current sequences respectively on the bridge arm reactor in the laboratory, and measure the noise levels of multiple sub-operating conditions of the bridge arm reactor when the sub-operating conditions are loaded;

[0095] The determination module 230 is used to perform superposition calculation on the noise levels of multiple sub-operating conditions to determine the noise level of the bridge arm reactor under the actual operating condition.

[0096] Optionally, the calculation module 210 includes:

[0097] A representation submodule, used to represent the discrete current frequency components under the actual operating conditions of the bridge arm reactor as a current amplitude sequence and a frequency value sequence;

[0098] The calculation submodule is used to calculate the sub-condition current amplitudes and corresponding sub-condition current frequencies of multiple sub-condition current sequences under laboratory loading according to the current amplitude sequence and the frequency value sequence.

[0099] Optionally, the computing submodule includes:

[0100] A first calculation unit is used to calculate the amplitude and frequency of the current square spectrum according to the current amplitude sequence and frequency value sequence of the current spectrum of the actual working condition of the bridge arm reactor;

[0101] A selection unit, used for selecting a finite number of sequences and their corresponding spectra according to the amplitude and frequency of the current square spectrum and a specific time cost;

[0102] The second calculation unit is used to calculate the sub-operating condition current amplitudes and corresponding sub-operating condition current frequencies of multiple sub-operating condition current sequences under laboratory loading according to a finite number of sequences and their corresponding frequencies.

[0103] Optionally, select units including:

[0104] The selection subunit is used to select a preset number of finite sequences and their corresponding spectra according to the amplitude and frequency of the current square spectrum and the proportion of the amplitude of each current square spectrum in the total spectrum.

[0105] Optionally, the frequency of the current square spectrum is 50n Hz, where n is a sequence number;

[0106] The calculation formula for the amplitude of the current square spectrum is:

[0107]

[0108] Wherein, n is the amplitude sequence number of the current square spectrum; ISq[n] is the value of the nth element in the amplitude sequence of the current square spectrum; m is the current amplitude sequence number; I[m] is the value of the mth element in the current amplitude sequence of the actual operating condition.

[0109] Optionally, the sub-condition current amplitude I sub _j and the corresponding sub-operating current frequency f sub The calculation formula of _j is:

[0110]

[0111] f sub _j=fSq[j] / 2

[0112] Where ISq[j] and fSq[j] are finite sequences and their corresponding frequencies respectively.

[0113] Optionally, the calculation formula for the noise level of the bridge arm reactor under actual operating conditions is:

[0114]

[0115] Wherein, L is the noise level of the bridge arm reactor under the actual operating condition; N is the total number of sub-condition current sequences; L_j is the noise level of the bridge arm reactor measured under the sub-condition current loading numbered j.

[0116] Exemplary Electronic Devices

[0117] Figure 3 This is a structure of an electronic device provided by an exemplary embodiment of the present invention. Figure 3 As shown, the electronic device 30 includes one or more processors 31 and a memory 32 .

[0118] The processor 31 may be a central processing unit (CPU) or other forms of processing units having data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device to perform desired functions.

[0119] The memory 32 may include one or more computer program products, and the computer program product may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory (cache), etc. The non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 31 may run the program instructions to implement the methods of the software programs of the various embodiments of the present invention described above and / or other desired functions. In one example, the electronic device may also include: an input device 33 and an output device 34, which are interconnected via a bus system and / or other forms of connection mechanisms (not shown).

[0120] In addition, the input device 33 may also include, for example, a keyboard, a mouse, and the like.

[0121] The output device 34 can output various information to the outside. The output device 34 can include, for example, a display, a speaker, a printer, a communication network and a remote output device connected thereto.

[0122] Of course, to simplify, Figure 3 Only some of the components related to the present invention in the electronic device are shown, and components such as a bus, an input / output interface, etc. are omitted. In addition, the electronic device may further include any other appropriate components according to specific application conditions.

[0123] Exemplary computer program products and computer-readable storage media

[0124] In addition to the above-mentioned methods and devices, an embodiment of the present invention may also be a computer program product, which includes computer program instructions, which, when executed by a processor, enable the processor to execute the steps of the method according to various embodiments of the present invention described in the above-mentioned "Exemplary Method" section of this specification.

[0125] The computer program product may be written in any combination of one or more programming languages ​​to write program code for performing the operations of the embodiments of the present invention, including object-oriented programming languages ​​such as Java, C++, etc., and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as a separate software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0126] In addition, an embodiment of the present invention may also be a computer-readable storage medium having computer program instructions stored thereon, which, when executed by a processor, enable the processor to execute the steps of the method according to various embodiments of the present invention described in the above “Exemplary Method” section of this specification.

[0127] The computer readable storage medium can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can include, for example, but is not limited to, a system, system or device of electricity, magnetism, light, electromagnetic, infrared, or semiconductor, or any combination of the above. More specific examples (non-exhaustive list) of readable storage media include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0128] The basic principle of the present invention is described above in conjunction with specific embodiments. However, it should be pointed out that the advantages, strengths, effects, etc. mentioned in the present invention are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. must be possessed by each embodiment of the present invention. In addition, the specific details disclosed above are only for the purpose of illustration and facilitation of understanding, rather than limitation, and the above details do not limit the present invention to being implemented by adopting the above specific details.

[0129] Each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the system embodiment, since it basically corresponds to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0130] The block diagrams of the devices, systems, equipment, and systems involved in the present invention are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, systems, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The word "such as" used here refers to the phrase "such as but not limited to", and can be used interchangeably with it.

[0131] The method and system of the present invention may be implemented in many ways. For example, the method and system of the present invention may be implemented by software, hardware, firmware or any combination of software, hardware, firmware. The above order of steps for the method is only for illustration, and the steps of the method of the present invention are not limited to the order specifically described above, unless otherwise specifically stated. In addition, in some embodiments, the present invention may also be implemented as a program recorded in a recording medium, which includes machine-readable instructions for implementing the method according to the present invention. Thus, the present invention also covers a recording medium storing a program for executing the method according to the present invention.

[0132] It should also be noted that in the system, device and method of the present invention, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent schemes of the present invention. The above description of the disclosed aspects is provided to enable any technician in the field to make or use the present invention. Various modifications to these aspects are very obvious to those skilled in the art, and the general principles defined here can be applied to other aspects without departing from the scope of the present invention. Therefore, the present invention is not intended to be limited to the aspects shown here, but in accordance with the widest range consistent with the principles and novel features disclosed here.

[0133] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present invention to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A noise measurement method for a three-phase DC commutation bridge arm reactor, characterized in that: include: According to the discrete current frequency components of the bridge arm reactor under actual operating conditions, multiple sub-condition current sequences under laboratory loading are calculated; Loading multiple sub-operating condition current sequences to the bridge arm reactor in a laboratory respectively, and measuring multiple sub-operating condition noise levels of the bridge arm reactor when the sub-operating conditions are loaded; The noise levels of multiple sub-operating conditions are superimposed and calculated to determine the noise level of the bridge arm reactor under the actual operating condition.

2. The method according to claim 1, characterized in that According to the discrete current frequency components of the bridge arm reactor under actual operating conditions, multiple sub-condition current sequences under laboratory loading are calculated, including: Representing the discrete current frequency components under the actual operating condition of the bridge arm reactor as a current amplitude sequence and a frequency value sequence; According to the current amplitude sequence and the frequency value sequence, the sub-operating condition current amplitudes and the corresponding sub-operating condition current frequencies of multiple sub-operating condition current sequences under laboratory loading are calculated.

3. The method according to claim 2, characterized in that According to the current amplitude sequence and the frequency value sequence, sub-operating condition current amplitudes and corresponding sub-operating condition current frequencies of multiple sub-operating condition current sequences under laboratory loading are calculated, including: Calculating the amplitude and frequency of the current square spectrum according to the current amplitude sequence and the frequency value sequence of the actual working condition current spectrum of the bridge arm reactor; According to the amplitude and frequency of the current square spectrum, a finite number of sequences and their corresponding spectra are selected according to specific time costs; According to a finite number of sequences and their corresponding frequencies, the sub-condition current amplitudes and corresponding sub-condition current frequencies of multiple sub-condition current sequences under laboratory loading are calculated.

4. The method according to claim 3, characterized in that According to the amplitude and frequency of the current square spectrum, a finite number of sequences and their corresponding spectra are selected according to specific time costs, including: According to the amplitude and frequency of the current square spectrum and the proportion of the amplitude of each current square spectrum in the total spectrum, a finite number of sequences and their corresponding spectra are selected according to the proportion.

5. The method according to claim 3, characterized in that: The frequency of the current square spectrum is 50n Hz, where n is a sequence number; The calculation formula for the amplitude of the current square spectrum is: Wherein, n is the amplitude sequence number of the current square spectrum; ISq[n] is the value of the nth element in the amplitude sequence of the current square spectrum; m is the current amplitude sequence number; I[m] is the value of the mth element in the current amplitude sequence of the actual operating condition.

6. The method according to claim 3, characterized in that The sub-operating condition current amplitude I sub _j and the corresponding sub-operating current frequency f sub The calculation formula of _j is: f sub _j=fSq[j] / 2 Where ISq[j] and fSq[j] are finite sequences and their corresponding frequencies respectively.

7. The method according to claim 1, characterized in that The calculation formula of the noise level of the bridge arm reactor under actual operating conditions is: Wherein, L is the noise level of the bridge arm reactor under the actual operating condition; N is the total number of sub-condition current sequences; L_j is the noise level of the bridge arm reactor measured under the sub-condition current loading numbered j.

8. A noise measurement device for a three-phase DC commutation bridge arm reactor, characterized in that: include: A calculation module is used to calculate multiple sub-condition current sequences under laboratory loading according to the discrete current frequency components of the bridge arm reactor under actual operating conditions; A recording module is used to load multiple sub-operating condition current sequences respectively on the bridge arm reactor in a laboratory, and measure multiple sub-operating condition noise levels of the bridge arm reactor when the sub-operating conditions are loaded; The determination module is used to perform superposition calculation on the noise levels of multiple sub-operating conditions to determine the noise level of the bridge arm reactor under the actual operating condition.

9. A computer-readable storage medium, characterized in that: The storage medium stores a computer program, and the computer program is used to execute the method according to any one of claims 1 to 7.

10. An electronic device, characterized in that: The electronic device comprises: processor; a memory for storing instructions executable by the processor; The processor is used to read the executable instructions from the memory and execute the instructions to implement the method described in any one of claims 1 to 7.

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