Time‐frequency transform‐based differential scheme for microgrid protection. Issue 2 (1st February 2014)

• Record Type: Journal Article
• Authors: Kar, Susmita; Samantaray, Subhransu Rajan
• Is Part Of: IET generation, transmission & distribution. Volume 8:Issue 2(2014)
• Page Start: 310
• Page End: 320
• Publication Date: 2014-02-01
• Subjects: distributed power generation -- fault currents -- power generation faults -- power generation protection -- power generation reliability -- power grids -- power system interconnection -- time‐frequency analysis -- wavelet transforms; microgrid protection -- time‐frequency transform‐based differential scheme -- S‐transform -- time‐frequency contour -- spectral energy content -- fault current signal -- fault pattern -- grid connected mode -- islanded mode -- shunt fault -- high‐impedance fault -- radial structure -- loop structure -- fault inception -- differential energy‐based protection scheme -- wide area protection; Electric power production -- Periodicals; Electric power transmission -- Periodicals; Electric power distribution -- Periodicals; 621.3105
• DOI: 10.1049/iet-gtd.2013.0180
• Languages: English
• ISSNs: 1751-8687

Abstract

Abstract : The study presents a differential scheme for microgrid protection using time‐frequency transform such as S‐transform. Initially, the current at the respective buses are retrieved and processed through S‐transform to generate time‐frequency contours. Spectral energy content of the time‐frequency contours of the fault current signals are calculated and differential energy is computed to register the fault patterns in the microgrid at grid‐connected and islanded mode. The proposed scheme is tested for different shunt faults (symmetrical and unsymmetrical) and high‐impedance faults in the microgrid with radial and loop structure. It is observed that a set threshold on the differential energy can issue the tripping signal for effective protection measure within four cycles from the fault inception. The results based on extensive study indicate that the differential energy‐based protection scheme can reliably protect the microgrid against different fault situations and thus, is a potential candidate for wide area protection.