Frequency Domain Model of a Three-Phase Power Electronics Interface for Unbalanced Harmonic Studies

Jayashree Yadav, K. Vasudevan, Jan Meyer
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Abstract

This paper proposes a frequency domain model that can be applied to any three-phase three-wire power electronic (PE) interface (no neutral connection). The model is obtained using a phase domain frequency coupling matrix and can be used to estimate the response of the PE interface under unbalanced harmonic conditions in low-voltage applications. The frequency coupling matrix is developed by linearizing the three-phase PE interface under small signal conditions in the frequency domain. The model is exemplarily parameterized for a variable frequency drive (VFD). The obtained model is tested for different distorted and unbalanced voltage waveforms obtained from actual field measurements. For validation, the response of the frequency domain model is compared with the response of a time-domain model developed in MATLAB. The applicability of the model is demonstrated using a case study of a network comprising linear and nonlinear loads.
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用于不平衡谐波研究的三相电力电子接口频域模型
本文提出了一种适用于任何三相三线电力电子(PE)接口(无中性点连接)的频域模型。该模型采用相域频率耦合矩阵得到,可用于估计低压应用中PE界面在不平衡谐波条件下的响应。在频域小信号条件下,对三相聚乙烯界面进行线性化,得到了频率耦合矩阵。该模型以变频器为例进行了参数化。对实际现场测量得到的不同畸变和不平衡电压波形进行了测试。为了验证,将频域模型的响应与MATLAB中开发的时域模型的响应进行了比较。通过一个包含线性和非线性负荷的网络实例研究,证明了该模型的适用性。
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