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ECE Colloquium Series – Professor Dionysios Aliprantis

May 3, 2018 @ 3:30 pm - 5:00 pm

As part of the *Eleanore Hale Wilson Lecture Series, ECE is proud to present:

 Offshore Wind Farms with Series-DC Collection: Opportunities and Challenges

Professor Dionysios Aliprantis
Purdue University
Hosts: Professor Sairaj Dhople and Professor Ned Mohan



Offshore wind projects have been trending upward in power capacity and distance from shore. At long distances (50–100 km), high-voltage dc (HVDC) transmission becomes economical. At the sending end of an HVDC transmission line, an offshore platform that houses transformers, switchgear, and power electronics is present, accounting for roughly 10% of the wind plant construction costs. In order to reduce costs by eliminating the offshore platform, series-dc collection has been proposed as an alternative means to incrementally build the required voltage level for HVDC transmission to shore.

In the series-dc wind plant architecture, series-connected turbines share the same dc current. This implies that the voltage at the dc terminals of a turbine will depend on the electric power output of every turbine in the branch. Moreover, if the wind plant has multiple branches of series-connected turbines, branches producing more power will carry higher currents. The electric power output of turbines is directly linked to the local wind speed, which varies significantly across a wind plant. This can be attributed predominantly to turbine wakes, which are particularly persistent offshore. Wind conditions can easily arise that could lead to voltages and/or currents exceeding their safe limits or dropping below minimum required levels for normal operation. In this seminar, we outline a mathematical framework for analyzing the operation of this system, we present promising initial findings, and we discuss relevant implementation challenges.


Dionysios Aliprantis is an Associate Professor of Electrical and Computer Engineering at Purdue University. Prior to joining Purdue, he was an Assistant Professor of ECE at Iowa State University. Dionysios obtained his PhD from Purdue University in 2003, and his Diploma in ECE from the National Technical University of Athens, Greece, in 1999. Prof. Aliprantis’ teaching and research interests are related to electromechanical energy conversion, with emphasis on electric machinery (their modeling, simulation, and design), power electronics (particularly machine drives), applications of automatic control to power electronics-based systems, and the analysis of power systems. More recently his work has focused on technologies that enable the integration of renewable energy sources in the electric power system, and the electrification of transportation.


*Established in 2009, the Eleanore Hale Wilson Fund supports engineering field leaders for travel to Minnesota to share their expertise and discoveries with University of Minnesota graduate students, faculty, and alumni. The fund also supports the receptions held in honor of each speaker.


May 3, 2018
3:30 pm - 5:00 pm


Keller Hall Annex 3-230
200 Union St SE
Minneapolis, MN 55455 United States
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