Mathematical morphology-based islanding detection for distributed generation

• Published in: IET generation, transmission & distribution transmission & distribution, 2016-02, Vol.10 (2), p.518-525
• Main Authors: Farhan, Musliyarakath Aneesa, Shanti Swarup, K
• Format: Article
• Language: English
• Subjects: close open difference filter; Computation; dilate erode difference filter; Distributed generation; distributed power generation; Electric potential; Electric power distribution; Electric power systems; fault location; filtering theory; Mathematical models; mathematical morphology; mathematical morphology based islanding detection; MM ratio index; negative sequence voltage; Operators (mathematics); power distribution faults; three phase current signal; three phase voltage signal; Voltage
• ISSN: 1751-8687; 1751-8695; 1751-8695
• DOI: 10.1049/iet-gtd.2015.0910

This study proposes a novel method based on mathematical morphology (MM) for islanding detection in micro-grid integrated with distributed generation (DG). The method uses basic MM operators like dilate erode difference filter (DEDF) to operate on three-phase voltage and current signals on target DG location. These filter output values are fed to a new operator defined as the average of the difference between maximum and minimum value of DEDF at each structuring element called KV and KI. Accordingly, a new operator called the MM ratio index (MM RI) of KI to KV is derived. The MM RI computed is used to track the islanding condition from non-islanding condition. Additionally, to further aid the islanding detection, a mathematical morphological operator close open difference filter on negative sequence voltage is computed, which is passed through a difference operator D. The proposed method is analysed extensively to efficiently detect islanding in electrical power distribution network integrated with DG.