一种基于瞬时无功功率理论的数字谐波检测

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Abstract The choice of the cut-off frequency reflects a tradeoff between maladjustment and the speed of dynamic response in the conventional detection method based on instantaneous reactive power theory. The paper proposes a novel digital real-time algorithm for detecting harmonic currents. This algorithm adopts a new variable step size least mean square(LMS) adaptive filter as LPF on harmonic detection circuit. The step-size is large when the algorithm is far from the optimum with decreasing as it approaches the optimum. The proposed algorithm allows more flexible control of misadjustment and fast convergence rate without the need to compromise one for the other. Meanwhile approximate theoretical expressions for the behavior of the algorithm are derived. The additional calculation is very little, so the algorithm presented is easy to implement. Simulation and experiment results illustrate that the performance of the proposed approach is satisfactory.

Key words： Harmonic detecting instantaneous reactive power theory adaptive filter variable step-size

Received: 11 March 2009 Published: 04 March 2014

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TM76

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	Articles by authors
	He Yingjie
	Liu Jinjun
	Wang Zhao'an
	Zou Yunping

Cite this article:

He Yingjie,Liu Jinjun,Wang Zhao'an等. A Digital Method for Detecting Harmonic Currents Based on Instantaneous Reactive Power Theory[J]. Transactions of China Electrotechnical Society, 2010, 25(8): 185-192.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2010/V25/I8/185

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