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Deterministic aggregated harmonic source models for harmonic analysis of large medium voltage distribution networks

机译:确定性聚合谐波源模型,用于大型中压配电网的谐波分析

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Modelling of harmonics in large medium voltage (MV) distribution networks has so far been a challenge due to the presence of a large number of harmonic sources contributing to total harmonic voltages. This study proposes a deterministic methodology of modelling harmonics in large real MV distribution networks using aggregate harmonic source models parameterised based on measurements and results from the literature. In this research, background harmonic voltages from the sub-transmission system are parameterised based on measurements in the analysed network. Aggregate harmonic current emission of different customer categories in low-voltage (LV) networks (households and small commercial customers) parameterised based on several measurements in LV networks was dominated by residential or office customer type configurations. The harmonic current emission of industrial customers is parameterised based on the results from published literature. Two methods for modelling harmonic sources are used and compared: (i) modelling according to the IEC 61000-3-6 summation law and recommended summation exponents and (ii) modelling using complex phasors. The results of the models show a good match with the measurements from power quality monitors installed in the analysed MV network. Based on these results, the method according to the IEC 61000-3-6 is recommended for large MV distribution networks.
机译:到目前为止,由于存在大量有助于总谐波电压的谐波源,因此在大型中压(MV)配电网络中对谐波进行建模一直是一个挑战。这项研究提出了一种确定性的方法,该方法使用基于测量和文献结果进行参数化的聚集谐波源模型,对大型实际MV配电网中的谐波进行建模。在这项研究中,来自子传输系统的背景谐波电压是根据所分析网络中的测量进行参数化的。在低压(LV)网络(家庭和小型商业客户)中基于不同测量值进行参数化设置的不同客户类别的总谐波电流发射主要由住宅或办公室客户类型配置决定。根据公开文献的结果对工业客户的谐波电流发射进行参数化。使用了两种建模谐波源的方法并进行了比较:(i)根据IEC 61000-3-6求和律和建议的求和指数进行建模,以及(ii)使用复相量进行建模。模型的结果表明与分析的MV网络中安装的电能质量监视器的测量值非常匹配。基于这些结果,建议将IEC 61000-3-6的方法用于大型MV配电网络。

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