Investigation of the harmonic behavior of three phase transformer under nonsinusoidal operation using finite element and wavelet packets
Investigation of the harmonic behavior of three phase transformer under nonsinusoidal operation using finite element and wavelet packets
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DOI：
10.1109/tmag.2006.872467
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发表时间：
2006-03
影响因子：
2.1
通讯作者：
O. Mohammed;N. Abed;S. Liu
中科院分区：
文献类型：
--
作者：
O. Mohammed;N. Abed;S. Liu
本文研究了非正弦运行下三相电力变压器的谐波行为。通过耦合变压器瞬态有限元（FE）模型和外部电路来获得变压器的终端行为。这种技术将允许变压器的非线性磁化行为的物理表示以及变压器参数的强频率依赖性。使用小波包变换算法（WPT）分析变压器电流和直流负载电流的谐波行为。主要发现是，电流波形的 WPT 分解过程产生的统一频带可用于识别谐波分量。由三次谐波分量失真的平坦输入电压对直流负载电流谐波的影响最大（相对于正弦曲线情况）。由 5 次谐波分量失真的峰值输入电压对变压器次级电流和励磁电流谐波的影响最大
This paper investigates the harmonic behavior of three phase power transformers under nonsinusoidal operations. The terminal behavior of the transformer was obtained by coupling the transformer transient finite-element (FE) model and external electric circuits. Such a technique would allow the physical representation of the nonlinear magnetization behavior of the transformer as well as the strong frequency dependence of the transformer parameters. The harmonic behavior of the transformer currents and the dc load current were analyzed using wavelet packet transform algorithm (WPT). The key findings are, uniform frequency bands resulting from WPT decomposition process of the current waveforms can be used for identification of harmonic components. The flattened input voltage distorted by 3rd harmonic component has the highest impact on the dc load current harmonics (with respect to the sinusoidal case). The peaking input voltage distorted by the 5th harmonic component has the highest impact on the transformer secondary current and the magnetizing current harmonics