Research on the Evaluation Mode of 95% Probability Value in the National Standard GB/T 14549-93

Author(s): Jiang Zeng, Wei-Wei Sun* and De-Hua Huang
College of Electric Power, South China University of Technology, Guangzhou 510640, Guangdong, China
International Journal of Smart Grid and Clean Energy, vol. 1, no. 1, September 2012: pp. 47–52
ISSN: 2315-4462
Digital Object Identifier: 10.12720/sgce.1.1.47-52

Abstract: The national standard GB/T 14549-93 stipulated 95% probability value as the judgment basis of the harmonic pollution degree, many problems turned up over the past ten years. Based on a study of several typical cases, this paper points out that the evaluation mode may carry out unfair evaluation results, destroy the consistency, and continuity of the measurement data, and analyzes the cause of the evaluation mode defects. Then, a new evaluation index and a data recording method were proposed and validated by experimental and simulation results to solve the existing problems quite well. The experimental and simulation results show that the new evaluation index provides a workable idea and suggestion for the national standard revision, and it should be applied to judge whether harmonic is excessive. The proposition of the new evaluation mode and index will benefit to perfecting harmonic management system and maintaining social equity. 

Keywords: Power system; harmonic; national standard; probability value; evaluation index

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