Volume 15, issue 4, 2015 is here in time to send it to Web of Knowledge for evaluation. We have 40 papers from different geographical areas, quite a few with experimental work. Power electronics is steadily becoming the main subject; rightly so, as P.E. is spreading quickly at ever larger power/unit and total power in various industrial drives, house appliances, hybrid and electric vehicles and modern power systems. The ever stronger renewable energy penetration in electric power systems with its time variability requires more and more variable generators with partial or full power electronics control up to high voltage d.c. power lines, regional, national and international. Papers in this field with strong contributions, theoretical and experimental are most welcome in the near future. Thanking the Authors, Field Associated Editors and Reviewers for their input so far, we stress again the need for quicker but diligent reviews for even stronger original papers. Sincerely, Ion Boldea, IEEE Life Fellow, Romanian Academy, Timisoara Branch Editor in Chief of www.jee.ro