1. National Institute of Applied Sciences and Technology, Centre Urbain Nord, BP 676, 1080 Tunis Cedex, Tunisia
2. University of Craiova, Faculty of Electrical Engineering, 107 Decebal Blvd., Craiova, Romania
3. Advanced Control Systems Laboratory, Department of Electrical Engineering, University of Zanjan, University Blvd., 45371-38791 Zanjan, Iran