基于小波变换的电力系统频率实时估计

SICE 2001. Proceedings of the 40th SICE Annual Conference. International Session Papers (IEEE Cat. No.01TH8603) Pub Date : 2001-07-25 DOI:10.1109/SICE.2001.977806

T. Lin, M. Tsuji, E. Yamada

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引用次数: 38

摘要

频率是电力系统的重要参数，也是衡量电能质量的重要指标。提出了一种利用小波变换估计电力系统频率的新方法。该方法采用复小波函数作为带通FIR滤波器，在其通频带内估计瞬时平均频率。此外，还提出了一种基于多项式型小波函数的连续小波变换递推算法，该算法非常适合于实时实现。性能评估表明，该方法在较宽的频率偏差范围内具有较高的鲁棒性和估计精度。进一步表明，该方法能够在动态条件下跟踪电力系统频率，并且不受谐波和直流分量衰减的影响。

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A wavelet approach to real time estimation of power system frequency

Frequency is an important parameter of electric power system, also a key index of power quality. A new approach to the estimation of power system frequency using wavelet transform is proposed in this paper. This approach adopts a complex wavelet function as band pass FIR filters to estimate the instantaneous average frequency in its pass frequency band. Besides this, a recursive algorithm of continuous wavelet transform (CWT) based on polynomial type wavelet function is also presented, by which this wavelet approach is very suitable for real time implementation. The performance evaluation exhibits a high robustness and estimation accuracy of the proposed technique over a wide range of frequency deviation. It is further shown that this approach is capable of tracking power system frequency under dynamic conditions, and is immune to the effects of harmonics and decaying DC component.

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来源期刊

SICE 2001. Proceedings of the 40th SICE Annual Conference. International Session Papers (IEEE Cat. No.01TH8603)

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