Modelling of the impedance frequency response of transformers at no load and under nominal conditions
Modelling of the impedance frequency response of transformers at no load and under nominal conditions
复制标题
空载和标称条件下变压器阻抗频率响应的建模
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
N. Batistela
中科院分区：
文献类型：
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作者：
M. Januario;P. Kuo;N. Batistela
在涉及电力系统的研究中，需要代表变压器在稳态运行或瞬态事件下的行为的模型是非常重要的。在这种情况下，本研究提出了一种模型，用于表示变压器在空载和标称条件下的阻抗频率响应。在该模型中，网络的参数与RLC细胞被用来再现谐振中存在的频率响应和RL网络部分也被用来表示在核心，这有助于在瞬态事件期间的电流阻尼的频率相关的影响。这些网络的参数值确定与最小二乘数值方法。为了评估模型以及确定参数值的方法，使用了来自两个单相变压器（16 kVA和55 MVA）频率范围从10 Hz到2 MHz的频率响应测量的数据。在频域和时域上对模型进行了验证。该模型可用于模拟Transformer在标称电压和频率条件下的运行，也可用于宽频谱。
The need for models that represent the behaviour of transformers operating in steady state or submitted to transient events is of great importance in studies involving power systems. In this context, this study presents a model used to represent the impedance frequency response of transformers at no load and under nominal conditions. In the model, networks of parameters with RLC cells are employed to reproduce the resonances present in the frequency responses and also RL network sections are used to represent the frequency-dependent effects in the core, which aid in the current damping during transient events. The parameter values of these networks are determined with the least-squares numerical method. To evaluate the model as well as the methodology to determine the parameter values, data originating from measurements of the frequency responses with frequency range from 10 Hz to 2 MHz of two single-phase transformers (16 kVA and 55 MVA) are used. Validations of the model are carried out in the frequency and time domains. The model can be used to simulate transformer operation under nominal conditions of voltage and frequency and also for a broad frequency spectrum.