Method for optimizing parameters of secondary sound source in active noise reduction of power transformer

Abstract

The invention discloses a method for optimizing parameters of a secondary sound source in active noise reduction of a power transformer. The method comprises the following steps of numbering positions; initializing an amplitude and a phase angle; primarily selecting the amplitude and the phase angle by utilizing a genetic algorithm; substituting the primarily selected amplitude, the phase angle, the number and the positions; performing feasibility judgment; and continuing fine-tuning and optimizing the amplitude and the phase angle of the secondary sound source and the like. The optimization of the parameters of the secondary sound source is a core issue researched by an active noise reduction technology of the power transformer. On the basis of analyzing an active noise reduction physical mechanism, a noise radiation model of the power transformer is established. Considering actual engineering needs, the parameters of the secondary sound source are divided into two categories, and the parameters of the secondary source are optimized from three aspects, namely the number, the position and the source strength. In view of the interaction among the parameters such as the positions and the source strength, fixed parameters and flexible parameters are alternately preferred to form a genetic algorithm-based gradual search approaching strategy, so that a good overall active noise reduction effect can be achieved.

Description

technical field [0001] The invention relates to a parameter optimization method of a secondary sound source, in particular to a parameter optimization method of a secondary sound source in active noise reduction of a power transformer. Background technique [0002] With the development of the national economy and the continuous expansion of the urban power grid, the installation sites of many high-voltage large-capacity transformers are gradually approaching or even entering the urban area. The measured data shows that the noise emitted by large-capacity transformers during continuous operation is as high as 80-100 decibels, which has a serious impact on people's normal work and life, and makes the problem of noise control of large-scale transformers more acute. [0003] The active noise reduction technology for power transformer noise is an active noise control in a three-dimensional space. Based on the Huygens principle, with the minimum radiated sound power as the basic p...

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