基于复解析带通滤波器的固有频率自适应提取原理和方法

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Abstract The fault-generated high-frequency signals in EHV transmission line is a series of natural frequencies in frequency domain. They vary with fault location, operation mode of system and fault resistance. For the lack of frequency resolution for FFT algorithm when high sampling frequency, natural frequencies can’t be sampled accurately. A new method based on multiple analytical band-pass filter is presented to extract natural frequencies adaptively. Firstly, the approximate range of natural frequency is determined from spectrum, then the signals are resampled and filtered through a multiple analytical band-pass filter, and the natural frequency is extracted accurately after shift frequency by analyzing spectrum of resampling signal using FFT. A typical 500kV system in PSCAD is used to verify the performance. The simulation results show that the method presented can improve frequency resolution and natural frequency can be extracted accurately.

Key words： Relay protection natural frequency multiple analytical band-pass filter heterogeneous structure resample spectrum analysis

Received: 11 September 2008 Published: 18 February 2014

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TM773

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	Wang Xingguo
	Huang Shaofeng

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Wang Xingguo,Huang Shaofeng. Natural Frequency Adaptive Extracting Principle and Method Based on Multiple Analysis Band-Pass Filter[J]. Transactions of China Electrotechnical Society, 2009, 24(12): 179-184.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2009/V24/I12/179

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