变压器直流偏磁的仿真研究

Simulative Study on Power Transformer With DC Magnetic Biasing

基于经验模态分解(empirical mode decomposition,EMD)和Hilbert变换,提出了一种新的变压器直流偏磁分析方法。首先对变压器励磁电流进行EMD分解,提取包含最多励磁电流畸变信息的基本模式分量(intrinsic mode function,IMF);再对IMF分量作Hilbert变换,得出其瞬时频率和幅值。仿真结果表明:该方法能够准确检测出励磁电流畸变的时间、频率和幅值。

On the basis of empirical mode decomposition （EMD） and Hilben transform, a new approach to analyze power transformer with DC magnetic biasing is proposed. In the proposed method, firstly, the EMD decomposition is applied to exiting current of power transformer to extract intrinsic mode function （IMF） components that contain most of distortion information in exiting current; then Hilbert transform is applied to IMF components to obtain their instantaneous frequencies and amplitudes. Simulation results show that the proposed method can detect the time, frequency and amplitude information of the distorted exciting current accurately.