Large power transformer self-adaptive active noise reduction control method and control system

Abstract

The invention discloses a large power transformer self-adaptive active noise reduction control method. The method comprises the steps that a sensor collects primary noise as a reference signal and transmits the reference signal to a self-adaptive controller, and the self-adaptive controller outputs, according to the reference signal, a control signal to be used as a secondary signal so as to drive a loudspeaker to give out secondary noise; a primary sound field established by the noise made by a power transformer and a secondary sound field established by secondary noise made by the loudspeaker overlap, and an error sensor collects the overlapped sound pressure and forms an error signal; and the self-adaptive controller receives the error signal, and then adjusts, according to a preset objective function, the phase and amplitude of the secondary signal by use of a least mean square (LMS) algorithm for converging coefficient variation till the error signal satisfies the objective function and achieves a stable state. Through adoption of the method, while the steady state error performance is guaranteed, the converging speed of the algorithm is improved, and the noise reduction effect can be improved; and the initial value of the convergence coefficient can be selected more freely.

Description

technical field [0001] The invention relates to the technical field of high-power transformer noise reduction, in particular to a high-power transformer adaptive active noise reduction control method and control system. Background technique [0002] Transformer noise is the sum of irregular, intermittent, continuous or random mechanical noise and air noise generated by the transformer body and cooling system during the body structure design, type selection layout, installation, and use. The noise generated by transformers widely affects residential areas, commercial centers, light stations, airports, factories and mines, enterprises, hospitals, schools and other places. With the improvement of people's environmental awareness and the restrictions on various types of noise by the environmental protection department, especially due to the continuous expansion of cities and the needs of urban power grid transformation, some substations are sometimes built in commercial and resi...

AI Technical Summary

Problems solved by technology

The quality of the adaptive controller control method plays a decisive role in the quality of the noise reduction effect. At present, in the traditional control algorithm, each weight coefficient in the iterative process has the same convergence step size, which leads to the convergence speed Contradictory issues with steady-state error performance

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