1. IST College, London South Bank University, Rostoviou 18 A, GR-11526, Athens, Greece
2. Independent Power Transmission Operator, Asklipiou 22, GR-14568, Krioneri, Athens, Greece,
3. Department of Electrical and Computer Engineering, Democritus University of Thrace, Building B’, University Campus, GR-67100, Kimmeria, Xanthi, Greece,