Power Quality Disturbances Recognition Based on a Multiresolution Generalized S-Transform and a PSO-Improved Decision TreeReport as inadecuate




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1

School of Electrical Engineering, Northeast Dianli University, Jilin 132012, China

2

Department of Electrical Engineering, Harbin Institute of Technology, Harbin 150001, China



These authors contributed equally to this work.





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Author to whom correspondence should be addressed.



Academic Editor: Josep M. Guerrero

Abstract In a microgrid, the distributed generators DG can power the user loads directly. As a result, power quality PQ events are more likely to affect the users. This paper proposes a Multiresolution Generalized S-transform MGST approach to improve the ability of analyzing and monitoring the power quality in a microgrid. Firstly, the time-frequency distribution characteristics of different types of disturbances are analyzed. Based on the characteristics, the frequency domain is segmented into three frequency areas. After that, the width factor of the window function in the S-transform is set in different frequency areas. MGST has different time-frequency resolution in each frequency area to satisfy the recognition requirements of different disturbances in each frequency area. Then, a rule-based decision tree classifier is designed. In addition, particle swarm optimization PSO is applied to extract the applicable features. Finally, the proposed method is compared with some others. The simulation experiments show that the new approach has better accuracy and noise immunity. View Full-Text

Keywords: power quality disturbances; S-transform; multiresolution; particle swarm optimization; decision tree power quality disturbances; S-transform; multiresolution; particle swarm optimization; decision tree





Author: Nantian Huang 1,* , Shuxin Zhang 1,†, Guowei Cai 1,† and Dianguo Xu 2

Source: http://mdpi.com/



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