Hudson Beare, Classroom 4
Friday, May 29, 2015 - 13:00 to 14:00
First Speaker: Faheem Akhter
Title: DC node voltage control on the Multi-terminal HVDC Grid
Offshore wind energy is seen as the most promising source of electricity generation for achieving the European renewable energy targets. A number of wind farms are planned and under installation to collect the huge potential of wind energy at farther distances in the North Sea. This has been extended to a wider concept of a DC grid for the interconnection of European countries with a MTDC grid, mainly using the technical advantages of VSC based HVDC transmission. However, the control of the DC node voltage is one of the major task for the DC grid control, which requires a balance of the active power flow through all the terminals of the MTDC grid. A comparison of different DC voltage control methods will be presented which proposes a suitable primary control for the DC grid. Further, these control are added into combined AC/DC power flows algorithms to provide a secondary control to the DC grid.
Faheem has received his Master degree Electrical, Electronics and Entrepreneurship from University of Notingham in 2011. In the same year he started his PhD on the topic of Operation and control challenges of the MTDC grid, here at the University of Edinburgh.
Second Speaker: Franz Hanser
Title: Important Data for Half-Bridge Bidirectional DC-DC Converters
This presentation complements work within IES on DC-DC converters. As these converters are used for applications such as electric vehicle chargers, solar panels, wind turbines or even simple battery chargers a calculation model has been developed. A survey of important data (maximum current and voltage estimation for the used components, rms values for the semiconductor parts and an estimation of the expected losses) for a half-bridge bidirectional buck boost DC-DC converter equipped with an LC output filter is carried out for this purpose. A practical model from this converter is derived and a transfer function from the duty cycle and from the voltages (input to the output) is calculated via a linearization method. A signal flow graph of the converter can be obtained. To decrease the power losses, the concept of zero voltage switching is additionally used and explained.
Franz M. Hanser has carried out projects in the Siemens development department for solar inverters in Vienna, Austria. He was also involved in the design process of money printers in Moedling, Austria. He achieved his Ing. degree in Electrical Engineering from the HTL Wiener Neustadt, Wiener Neustadt, Austria in 1999 and his BSc in Industrial Electronics from the University FH Technikum- Wien, Vienna, Austria in 2007. He was awarded the Dipl.- Ing. degree in Information Technology from the Ingenieurhochschule Mittweida, Mittweida, Germany in 2010. He received an MSc in Power Systems Engineering from the University of Manchester, Manchester, U.K. in 2011 and is currently pursuing a PhD in Engineering and Electronics (Energy Systems) in the Institute for Energy Systems at the University of Edinburgh, Edinburgh, U.K.
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