基于最小二乘法和时频原子变换的谐波/间谐波测量算法

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Abstract A new harmonic/inter-harmonic detecting method is presented in this paper, which is based on least-square method and time-frequency transform (TFT). In the first step of approach, least-square algorithm is used to obtain the number and approximate frequency of harmonic and inter-harmonics by scanning the whole frequency band. Then, TFT is applied to detect harmonics & interharmonics’ accurate frequency and amplitude of each component through configuration of complex band pass filter(CBPF) corresponding to TFT. TFT is a novel time frequency analysis method with the characteristic of adaptive complex band pass filter. It decouples the center and the width of frequency window, so the the width of frequency can be adjusted freely without the restriction from the center frequency window. Mutually uncrossed CBPF is constructed to inhibit interference of adjacent frequency component. Also, it can inhibit the influence of fundamental frequency’s fluctuation on measuring accuracy under asynchronous sampling. The simulation results indicate that this method has the advantage of high detecting accuracy, low calculation amount and great anti-noise performance.

Key words： Power system harmonics inter-harmonics least-squares algorithm time frequency transform(TFT) complex band pass filter(CBPF)

Received: 30 March 2010 Published: 07 March 2014

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TM714

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	Cao Jian
	Lin Tao
	Xu Xialing
	Zhang Man
	Liu Lin

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Cao Jian,Lin Tao,Xu Xialing等. Monitoring of Power System Harmonic/Inter-Harmonics Based on Least Squares Algorithm and Time Frequency Transform[J]. Transactions of China Electrotechnical Society, 2011, 26(10): 1-7.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2011/V26/I10/1

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