The increasing application of non-linear power-electronic based devices in low voltage networks might have a negative impact on power quality, particularly on harmonics. To estimate the harmonic levels or to identify possible resonances, respective network simulations involving a large number of power electronic devices are necessary. These require realistic device models, which need to represent both the harmonic emission and the input admittance characteristic, as otherwise simulations might not converge or result in unrealistic results. While many proposals exist for harmonic emission models, not much approaches can be found regarding the input admittance. This study intends to fill this gap and presents a modelling approach combining the harmonic emission and the input admittance characteristic in a single model. Therefore, the classic Norton model is extended by a generic circuit-based part, which consists of linear, passive components and is parameterised based on measurements. The extended Norton model is applied to six photovoltaic inverters and 18 electric vehicle chargers and its application are demonstrated in a harmonic simulation.

中文翻译：

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现代电力电子设备的扩展耦合诺顿模型，用于配电网络中的大规模谐波研究

非线性电力电子设备在低压网络中的日益增加的应用可能会对电能质量，特别是谐波产生负面影响。为了估计谐波水平或识别可能的谐振，需要涉及大量电力电子设备的各个网络仿真。这些都需要现实的设备模型，该模型需要代表谐波发射和输入导纳特性，否则仿真可能不会收敛或导致不切实际的结果。尽管存在许多针对谐波发射模型的建议，但在输入导纳方面找不到很多方法。本研究旨在填补这一空白，并提出了一种在单个模型中结合谐波发射和输入导纳特性的建模方法。因此，经典的诺顿模型由通用的基于电路的部分扩展，该部分由线性，无源组件组成，并根据测量进行参数设置。扩展的Norton模型应用于六个光伏逆变器和18个电动汽车充电器，并在谐波仿真中演示了其应用。