基于奇异谱分解的三相电力变压器振动噪声抑制方法  

Vibration and Noise Suppression Method for Three-phase Power Transformer Based on Singular Spectrum Decomposition

作　　者：冯哲渊 Feng Zheyuan(Guangzhou Siemens Transformer Co.,Ltd.,Guangzhou 511356,China)

机构地区：[1]广州西门子变压器有限公司,广州511356

出　　处：《机电工程技术》2022年第11期306-309,共4页Mechanical & Electrical Engineering Technology

摘　　要：针对当前噪声抑制方法对非线性噪声信号的抑制效果不佳、抑制后仍存在非线性漂移的问题,提出基于奇异谱分解的三相电力变压器振动噪声抑制方法。计算振动噪声奇异频谱带宽,获取特征向量重构成分。构建振动噪声漂移矩阵,改善特征分量重构特性。计算残余项和原始信号之间的标准差,得到噪声信号漂移轨迹的最优解。以仿真信号为研究对象,增强噪声信号漂移轨迹特征,解决非线性漂移问题。使用端点抑制策略抑制三相电力变压器振动噪声,通过组合窗函数避免两端突变,保证噪声信号不失真。实验结果表明,提出的方法能够有效解决非线性漂移问题,且经过噪声抑制后得到的频谱幅值与理想情况基本一致,只存在0.1 m/s^(2)的误差,说明抑制效果较好。Aiming at the poor effect of current noise suppression methods on nonlinear noise signals and the problem of nonlinear drift after suppression,a vibration noise suppression method for three-phase power transformers based on singular spectrum decomposition was proposed.The singular spectral bandwidth of vibration noise was calculated and the reconstructed component of the eigenvector was obtained.The vibration and noise drift matrix was constructed to improve the reconstruction characteristics of eigencomponents.The standard deviation between the residual term and the original signal was calculated to obtain the optimal solution for the drift trajectory of the noise signal.Taking the simulated signal as the research object,the drift trajectory characteristics of the noise signal were enhanced to solve the nonlinear drift problem.The endpoint suppression strategy was used to suppress the vibration and noise of the three-phase power transformer,and the combination of window functions was used to avoid sudden changes at both ends to ensure that the noise signal was not distorted.The experimental results show that the method can effectively solve the problem of nonlinear drift,and the spectrum amplitude obtained after noise suppression is basically consistent with the ideal situation,with only an error of 0.1m/s^(2),indicating that the suppression effect is good.

关 键 词：奇异谱分解 三相电力变压器 振动噪声 漂移矩阵 端点抑制 

分 类 号：TM41[电气工程—电器]