Journal of South China University of Technology(Natural Science Edition) ›› 2012, Vol. 40 ›› Issue (11): 107-112.

• Power & Electrical Engineering • Previous Articles     Next Articles

Fuzzy Comprehensive Evaluation of Power Quality Based on Improved Membership Function

Jiang Jin-liang  Yuan Jin-jing  Ouyang Sen   

  1. School of Electric Power,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2012-01-11 Revised:2012-04-25 Online:2012-11-25 Published:2012-10-01
  • Contact: 蒋金良(1953-) ，男，副研究员，主要从事电力市场、电力企业管理研究． E-mail:jljiang@ scut.edu.cn
  • About author:蒋金良(1953-) ，男，副研究员，主要从事电力市场、电力企业管理研究．
  • Supported by:

    国家自然科学基金重点资助项目( 50937001) ; 华南理工大学中央高校基本科研业务费专项资金资助项目( 2012ZM0018)

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Abstract:

In order to improve the accuracy of the fuzzy comprehensive evaluation of power quality and to contact and quantify each grades of the power quality index,the membership function employed in the fuzzy comprehensive evaluation is analyzed,and an improved membership function is proposed to quantify the fuzzy characteristics that reflect the grades of the power quality index. In the investigation,first,the weight of the power quality index,the index limit for determining the parameters of the membership function and the division of quality grades are all analyzed. Then,the traditional ridge-shaped function is improved to construct an improved membership function based on the quality grades,and the fuzzy models of power quality indexes are established. The proposed method is finally applied to the evaluation of power quality of a regional power grid,with its practicability and effectiveness being verified by the results.

Key words: power quality, fuzzy comprehensive evaluation, membership function

CLC Number: