基于输入观测器理论的电流谐波检测方法

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Abstract Based on the input observer theory, the online current harmonics detection method is proposed, which can detect all the frequency components within the current signal accurately and rapidly. Firstly, by setting the state variables as the value and each frequency component of the measured current, a linear time-varying state space model is established. Then, based on the proposed model, a time-varying observer is constructed to estimate the unknown states in order to achieve the extraction of each frequency component. The stability and convergence of the observer are proved by the Lyapunov theorem and the Lasalle invariant set principle. Finally, the simulation and experimental results show that the proposed method has advantages in detection speed, accuracy, dynamic tracking performance, and robustness.

Key words： Harmonic detection input observer state space model stability analysis

Received: 10 June 2015 Published: 20 April 2016

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TM935

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	Li Po
	Zhang Yiru

Cite this article:

Li Po,Zhang Yiru. A Current Harmonics Detection Method Based on Input Observer Theory[J]. Transactions of China Electrotechnical Society, 2016, 31(7): 136-144.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2016/V31/I7/136

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