1. Prince Sultan University,Renewable Energy Lab.,College of Engineering,Riyadh,Saudi Arabia
2. Kafrelsheikh University,Faculty of Engineering,Department of Electrical Engineering,Kafrelsheikh,Egypt
3. Tanta University,Faculty of Engineering,Department of Electrical Power Systems and Machines,Egypt
4. Glasgow Caledonian University,School of Engineering and Built Environment,Electrical Power Eng. Dept.,Glasgow,UK