Three-Phase Asymmetric Transformer Aging Considering Voltage-Current Harmonic Interactions, Unbalanced Nonlinear Loading, Magnetic Couplings, and Hysteresis
Three-Phase Asymmetric Transformer Aging Considering Voltage-Current Harmonic Interactions, Unbalanced Nonlinear Loading, Magnetic Couplings, and Hysteresis
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DOI：
10.1109/tec.2011.2181949
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发表时间：
2012-02
影响因子：
4.9
通讯作者：
P. Moses;M. Masoum
中科院分区：
文献类型：
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作者：
P. Moses;M. Masoum
提出了一种新的三相三腿电力变压器在（非）平衡和（非）正弦工况下的老化计算方法，该方法准确地考虑了磁饱和、耦合和磁滞的影响。通过最近开发并验证的非线性三相三腿变压器时域模型进行了老化估计。根据阿伦尼乌斯的热反应理论，利用模型输出进行老化计算。计算中考虑了变压器铁心不对称和负载非线性引起的综合老化效应，以及非正弦输入激励和非线性负载引起的电流和电压谐波相互作用。该模型改进了传统的加权谐波因子（WHF）老化估计方法，通过直接评估铁芯、非线性负载和终端电压畸变产生的附加基频和谐波损耗。主要贡献是一种新的变压器老化估计方法，该方法考虑了不平衡非线性负载的谐波电流-电压相互作用，终端电压畸变和不平衡，以及不对称铁芯结构中的磁滞和磁耦合效应，具有更广泛的适用性。通过实例比较了基于模型的老化方法与传统的WHF方法。
A new aging calculation method for three-phase three-leg power transformers under (un)balanced and (non)sinusoidal operating conditions is proposed where the impacts of magnetic saturation, couplings, and hysteresis are accurately included. The aging estimation is carried out through a recently developed and validated time-domain model of a nonlinear three-phase three-leg transformer. The model outputs are used to compute aging based on Arrhenius' thermal reaction theory. The combined aging effects from transformer core asymmetry and load nonlinearity, as well as current and voltage harmonic interactions from nonsinusoidal input excitations and nonlinear loading are considered in the calculation. The model improves upon the conventional weighted harmonic factor (WHF) approach of aging estimation by direct evaluation of additional fundamental and harmonic losses generated by the iron-core, nonlinear loads, and terminal voltage distortions. The main contribution is a new transformer aging estimation method with wider applicability to three-phase transformers considering harmonic current-voltage interactions from unbalanced nonlinear loads, terminal voltage distortions and imbalances, as well as magnetic hysteresis and flux-coupling effects in asymmetric iron-core structures. Several case studies are presented for comparing the proposed model based aging method with the conventional WHF approach.