Improved SVD-based data compression method for synchronous phasor measurement in distribution networks

Zhao, Jinli, Ye, Yuzhuan, Yu, Hao, Li, Peng, Li, Peng, Wu, Jianzhong ORCID: https://orcid.org/0000-0001-7928-3602 and Wang, Chengshan 2021. Improved SVD-based data compression method for synchronous phasor measurement in distribution networks. International Journal of Electrical Power and Energy Systems 129 , 106877. 10.1016/j.ijepes.2021.106877

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Abstract

The integration of phasor measurement units (PMUs) greatly improves the operation monitoring level of distribution networks. However, high sampling rates in PMUs generate huge volumes of measurement data, which creates heavy transmission and storage burdens in information and communication systems. In this paper, an improved singular value decomposition (SVD)-based data compression method for PMU measurements in distribution networks is proposed. First, a lossless phase angle conversion method is proposed, which converts the discontinuous phase angle data of PMU into continuous data sequence to enhance the compression performance. Then, a PMU data compression method is proposed based on SVD, and the compression capability is further enhanced by a lossless compression that utilizes the orthogonal property of the two sub-matrices generated by SVD. Moreover, an error control strategy is designed to dynamically optimizes the scale of transmitted data according to the accuracy requirement of different applications in distribution networks. Finally, case studies are performed using real PMU measurement data from a pilot project in China to validate the compression performance and advantages of the proposed method.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Publisher:	Elsevier
ISSN:	0142-0615
Date of First Compliant Deposit:	20 April 2021
Date of Acceptance:	28 January 2021
Last Modified:	26 Nov 2024 05:45
URI:	https://orca.cardiff.ac.uk/id/eprint/140540

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