1. Electrical & Electronics Engineering Department, Faculty of Electrical and Computer Engineering; University of Tabriz; Tabriz Iran
2. School of Electrical and Electronic Engineering; The University of Manchester; Ferranti Building Manchester M13 9PL U.K.
3. Department of Electrical Engineering, Lahijan Branch; Islamic Azad University; Lahijan Guilan Iran
4. Department of Energy Technology; Aalborg University; DK-9220 Aalborg East Denmark