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Active Noise Control Method for Power Transformers Based on Convex Combined Adaptive Filter

An adaptive filter and active noise control technology, applied in the direction of adaptive network, electrical components, impedance network, etc., to achieve the effect of reducing computational complexity, good comprehensive performance, and avoiding exponential operation

Active Publication Date: 2019-09-10
WUHAN UNIV
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Problems solved by technology

Introducing Convex Combined Adaptive Filters into Active Noise Control Systems

Method used

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  • Active Noise Control Method for Power Transformers Based on Convex Combined Adaptive Filter
  • Active Noise Control Method for Power Transformers Based on Convex Combined Adaptive Filter
  • Active Noise Control Method for Power Transformers Based on Convex Combined Adaptive Filter

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Embodiment

[0040] One, at first introduce the specific steps of the present invention.

[0041] The present invention introduces the convex combined adaptive filter into the active noise control system, and in the combined filter, one filter adopts the variable step size FxLms algorithm based on the skip line function; while the other filter adopts a fixed small step size FxLms algorithm; when selecting the combination coefficient, replace the traditional Sigmoid function with the modified skip line function, and define the output of the combination filter as:

[0042] Y(n)=λ(n)Y 1 (n)+[1-λ(n)]Y 2 (n)

[0043] Among them, y 1 (n), y 2 (n) are the outputs of two independent adaptive filters; λ(n) is the combination coefficient of the two filters, and 0≤λ(n)≤1;

[0044] The primary sound source signal acts on the noise reduction point through the primary channel as

[0045] d(n)=P(n)*X(n)

[0046] In the formula, P(n) is the impulse response vector of the primary channel, and * mean...

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Abstract

The invention provides a power transformer active noise control method based on convex combination adaptive filters so as to harmonize conflict between convergence speed and steady-state error in a power transformer active noise control algorithm. In the combination filters, one filter adopts a variable-step-size FxLms algorithm based on a versiera function to enable faster convergence speed and time-varying tracking performance to be obtained in the system operation early stage; and while the other filter adopts a fixed-small-step-size FxLms algorithm to ensure small steady-state error after system convergence, and meanwhile, to compensate the stabilization problem of the variable-step-size algorithm due to step change under the steady state. In combination coefficient selection, the modified versiera function is utilized to replace a conventionanl Sigmoid function, thereby preventing exponent operation, reducing system calculation complexity, and improving sensitiveness of combination coefficients to overall errors; the algorithm is allowed to have fast convergence performance, and meanwhile, can obtain smaller steady-state error; and compared with the conventional algorithm, the method has better overall performance.

Description

technical field [0001] The invention belongs to the field of active noise control, and relates to an active noise control method of a power transformer based on a convex combination adaptive filter. Background technique [0002] With the substantial improvement of material living standards, people pay more and more attention to their quality of life. Reducing the noise of the substation can reduce the interference of noise to the lives of the surrounding people and improve their quality of life. The active noise control system can reduce the low-frequency noise of the substation in a targeted manner, and is a hot research direction in the field of noise control. However, there is an irreconcilable contradiction between the convergence speed and the steady-state error of the system, that is, when the system has a fast convergence speed, the system will have a large steady-state error; on the contrary, when the steady-state error is small, the convergence speed is very slow. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H21/00
Inventor 应黎明杨鹏王国栋王晋伟王东晖王玉磊
Owner WUHAN UNIV
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