Using frequency zoom technology to realize high precision and adaptive frequency measurement for power system

A windowed DFT method is proposed for power system frequency measurement involving amplitude modulation. First, an error analysis of conventional DFT based method considering amplitude modulation is given. Second, a noval a window DFT function is proposed method to eliminate these errors is given based on the relation among three consecutive DFT values. Due to its high precision and low required processing effort, the proposed algorithm is a good candidate for online frequency measurement.

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A High Precision and Fast Frequency Measurement Method Based on Spectrum Segmentation for UWB Electronic Reconnaissance System

2020 Chinese Control And Decision Conference (CCDC) ◽

10.1109/ccdc49329.2020.9164497 ◽

2020 ◽

Author(s):

Yi Chen ◽

Xiongjun Wu ◽

Shujie Lei ◽

Junxing Zhang

Keyword(s):

High Precision ◽

Measurement Method ◽

Frequency Measurement

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High Precision Detection for Power System Parameters Based on Wavelet Transform under Asynchronous Sampling

2010 International Conference on Electrical and Control Engineering ◽

10.1109/icece.2010.284 ◽

2010 ◽

Author(s):

Ying Zhang-Feng ◽

Wu Jun-ji

Keyword(s):

Wavelet Transform ◽

Power System ◽

High Precision ◽

System Parameters ◽

Asynchronous Sampling

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High-Accuracy Fundamental Frequency Detection in Power System

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.383-390.4962 ◽

2011 ◽

Vol 383-390 ◽

pp. 4962-4966

Author(s):

Ling Li ◽

Guo Bin Jin ◽

Shao Ping Huang ◽

Xiao Peng

Keyword(s):

Power System ◽

Fundamental Frequency ◽

Frequency Measurement ◽

Least Square ◽

Signal Model ◽

Least Square Estimation ◽

Signal Process ◽

Frequency Detection ◽

Novel Method ◽

Subspace Estimation

A novel method on frequency measurement based on improved TLS-ESPRIT (total least square estimation of signal parameters via rotational invariance techniques) is proposed in this paper with the research on fundamental frequency measurement in power system. TLS-ESPRIT is belong to subspace estimation in modern signal process. Noise is included in signal model, so it is independent on noise. But the same multi-poles cannot be taken when signal is in noise and based on TLS-ESPRIT. Multiple poles restoring is presented to take the true poles accurately. It is revealed that fundamental frequency is detected accurately in harmonics, interharmonics, noise and frequency fluctuations and better anti-noise ability in particular better adaptiveness on time varying signal in amplitude by simulation results.

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