1. Professor, Dept. of Electrical Engineering, Shiraz Univ. of Technology, 71555313 Shiraz, Iran.
2. Professor, Dept. of Electrical Engineering, Shiraz Univ. of Technology, 71555313 Shiraz, Iran (corresponding author).
3. Professor, Institute of Energy Technology, Aalborg Univ., DK-9220 Aalborg East, Denmark.