1. Laboratoire d'Electrotechnique et Energies Renouvelables (LEER); Souk Ahras University; BP 1553, 41000 Souk Ahras Algeria
2. University of Picardie Jules Verne; MIS (E.A.4290) 7 Rue du Moulin Neuf, 80000 Amiens France
3. College of Engineering and Science; Victoria University; Melbourne, Victoria 8001 Australia
4. Faculty of Engineering and Science; University of Agder; N-4898 Grimstad Norway