Substation noise source distribution measuring method based on synthetic aperture principle

Abstract

The invention discloses a substation noise source distribution measuring method based on a synthetic aperture principle. The method comprises the following steps of adopting an array to sample substation radiation noise fields in different space positions, wherein the array consists of one group of microphones with fixed relative positions; meanwhile, fixing a plurality of reference microphones to sample the substation radiation noise fields; and then, utilizing a data processing method to synthesize the noise fields, which are sampled in different space positions by the array consisting of the microphones, through signals sampled by the reference microphones, so as to measure the substation low-frequency noise source distribution. The method is based on an array technique, and the higher angle resolution can be obtained. When one sound source is measured, the other sound sources can be effectively shielded, and the measuring precision is higher. The method has the advantage that the characteristic of the substation noise being a stable single-frequency signal is utilized, and by using the reference microphones, the small-aperture arrays in different positions are synthesized into a virtual large-aperture array, so the problem of measurement of the low-frequency noise source is effectively solved.

Description

technical field [0001] The invention relates to a method for measuring the distribution of noise sources in substations based on the principle of synthetic aperture, which is suitable for the positioning of low-frequency steady-state noise sources and belongs to the field of signal processing and noise measurement. Background technique [0002] With the rapid development of my country's power grid construction, more and more power transmission substations have entered the city center in recent years. Suburban urbanization has caused more and more substations to be surrounded by residential buildings, and the noise problem has become increasingly prominent. At the same time, all walks of life have higher and higher requirements for environmental protection, and the problem of noise control in substations has become a new focus of environmental protection in the power industry. There are many equipments in the substation, and the transformer main transformer equipment, reactor...

AI Technical Summary

Problems solved by technology

However, this method is sensitive to errors such as microphone position and performance, and in near-field conditions, it cannot locate multiple coherent sound sources

[0013] The above methods have their limitations. In order to accurately measure the distribution of low-frequency noise sources in substations, new methods and technical approaches must be found

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