Two level islanding detection method for distributed generators in distribution networks

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• 作者：Smita Shrivastava ; ^{drsmita19@gmail.com}Author Vitae ; Shailendra Jain ^{sjain68@gmail.com}Author Vitae ; Rajesh Kumar Nema ^{rk_nema@yahoo.com}Author Vitae ; Vijayshri Chaurasia ^{vijayshree21@gmail.com}Author Vitae
• 关键词：Distributed generators ; Islanding detection ; Wavelet transform ; Energy entropy ; Frequency drift
• 刊名：International Journal of Electrical Power & Energy Systems
• 出版年：2017
• 出版时间：May 2017
• 年：2017
• 卷：87
• 期：Complete
• 页码：222-231
• 全文大小：981 K
• 卷排序：87

文摘

A new islanding detection method which provides a reliable detection in two levels is proposed. At first level wavelet energy entropy is used as an indicator to suspect islanding and activate second level method. Second level method is an active frequency drift method with positive feedback and pulsating chopping fraction. Frequency of distributed generators is varied to realize the anti islanding protections. It provides fast islanding detection with least disturbance in inverter’s grid connected operation.