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Interharmonics analysis of power signals with fundamental frequency deviation using Kalman filtering

机译:使用卡尔曼滤波的具有基本频率偏差的功率信号间谐波分析

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摘要

In this paper a spectral decomposition-based method for interharmonic computation is proposed for power systems where the fundamental frequency fluctuates significantly. In the proposed method, the frequency domain components of the voltage waveform are obtained by Kalman filtering. Both the system fundamental frequency and the correct spectrum of the voltage waveform, and hence the exact interharmonics are obtained. The proposed method is tested with both simulated and field data obtained from different electric arc furnace (EAF) plants, where the system frequency deviates continuously due to the fluctuating load demands. Since the interharmonic frequencies are obtained by using Kalman filtering, no leakage effect of the DFT-based methods is involved in case of frequency deviations, which is an important advantage of the proposed method.
机译:本文提出了一种基于频谱分解的间谐波计算方法,用于基本频率波动较大的电力系统。在提出的方法中,通过卡尔曼滤波获得电压波形的频域分量。系统基频和电压波形的正确频谱都可以得到,因此可以获得精确的间谐波。使用从不同的电弧炉(EAF)工厂获得的模拟数据和现场数据对所提出的方法进行了测试,其中,由于负载需求的波动,系统频率不断变化。由于间谐波频率是通过使用卡尔曼滤波获得的,因此在频率偏差的情况下,不会涉及基于DFT的方法的泄漏效应,这是该方法的重要优势。

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