Disturbance observation method based power transformer active noise control system

Abstract

The invention relates to the technical field of active noise control, and particularly relates to a disturbance observation method based power transformer active noise control system. The power transformer active noise control system comprises a primary sensor array, a preamplifier I, an error sensor array, a preamplifier II, a power amplifier, an industrial control computer, a PCI data acquisition card, a PCI data output card, a visual disturbance observation control module and a secondary sound source array, wherein the primary sensor array and the error array are connected to the PCI data acquisition card respectively through the preamplifier I and the preamplifier II, the PCI data acquisition card is connected to the PCI data output card through the industrial control computer, and the PCI data output card is connected to the secondary sound source array through the power amplifier; and the industrial control computer serves as a carrier of the PCI data acquisition card, the PCI data output card and the visual disturbance observation control module. The power transformer active noise control system track noise signals in real time through a disturbance observation control algorithm, and realizes effective noise reduction after being put into an actual transformer station.

Description

technical field [0001] The invention belongs to the technical field of active noise control, and in particular relates to a power transformer active noise control system based on a disturbance observation method and a visual disturbance observation control method for the active noise control system. Background technique [0002] With the rapid expansion of my country's urbanization scale and the increasing demand for electricity from residents, some newly-built substations and distribution network substations in the suburbs are adjacent to the living areas of residents, and the problem of transformer noise disturbing residents has become increasingly prominent. And the diffraction ability is strong, the transmission distance is long, and the long-term low-frequency noise environment is not good for human health. Conventional passive noise control methods have no significant effect on this type of low-frequency noise control and require a huge investment. At the same time, ins...

AI Technical Summary

Problems solved by technology

[0005] Existing active noise control technologies mainly include LMS and its improved algorithms. When applied to transformer noise control, external interference noise and acoustic feedback will have a serious impact on the algorithm. Some improved algorithms of LMS have high computational complexity and cannot be effective. Solve the problem of algorithm delay; another existing signal synthesis algorithm applied to transformer active noise control, although it can avoid the adverse effects of acoustic feedback on the system, it does not take into account the power signal voltage amplitude and related noise sound pressure level Amplitude conversion relationship, and it is difficult to accurately obtain the transfer function of the propagation path of the iron core vibration generated by the magnetostrictive effect of the current signal through the insulating oil to the oil tank wall and then radiated to the air, which is difficult to be practically applied to transformer noise control

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