First Speaker: Dr Yiannis Katsigiannis, TEI Crete, Greece

Title: 'Effect of pumped hydro storage on the Cretan power system operation'

Synopsis:
The existing and expected integration of significantly high installed capacity from renewable energy sources (RES) (mainly wind turbines and photovoltaics) in the autonomous power system of Crete is of particular interest, not only because of the high RES potential, but also due to its specific operating characteristics (non-interconnected, large number of small capacity conventional plants, high production costs, etc.).  Apart from the already apparent and expected benefits because of high RES penetration, a variety of parameters that include RES variation, loss of conventional units, added errors and complexity in the operating power system conditions due to increased number of RES plants, may cause significant issues on the Cretan power system stability. Moreover, the technical constraints that are added due to RES technologies operation may lead to a reduction of their absorbed energy by the power system, reducing therefore the benefits from their commitment.

One way to achieve high penetration from renewable energy, while maintaining both the desired dynamic stability and economic operation of the Cretan power system is the design and development of an advanced and intelligent power management system of real time. The aim of the presented project is the development and utilisation of such an advanced system.

Short Bio:
Dr Yiannis Katsigiannis is an Adjunct Professor at the Technological educational Institute of Crete (TEIC) and a Research Associate at the Technical University of Crete (TUC). He holds two MEng degrees in 'Production Engineering and Management' and 'Environmental Engineering', an MSc in 'Production Systems' and a PhD on Optimal Sizing of Isolated Power Systems based on Renewable Energy Sources', all from the Technical University of Crete, Greece. He is a member of the Technical Chamber of Greece. His research interests include artificial intelligence, renewable energy sources and their integration to power systems. He has published 1 book chapter, 25 papers in peer reviewed journals and 33 papers in international conferences.

Second Speaker: Ing. Dipl.-Ing. Franz Hanser BSc, MSc (Manchester), PhD (Edinburgh) Candidate

Abstract:
The development and simulation of a transformer tap changer algorithm for meshed power networks has been proposed. The basic theory behind the algorithm is based on Kirchhoff?s laws and calculations of line impedances. A modified adaptive voltage reference setting (AVRS) algorithm has been implemented in Matpower to adjust meshed power networks as well as radial feeders. Explanation of the basic theory and the implementation of the algorithm, via a look up table, will be outlined in this presentation based on the practical U.K. radial distribution network and the standardised IEEE 30 Bus test network. The presentation will focus on the verification of the obtained results. The simulation of the time-series-based behaviour of the various networks, including tap settings and bus voltages, will be presented. It is found that the proposed algorithm leads to reduced tap changing activity and has a positive impact on transformer reliability. The advantages of meshed power networks and applying the proposed algorithm will be highlighted and put into context with smart grids. I anticipate that this presentation will be used as starting point for further developments of smart grids in terms of adding voltage stability to the future grid, adding redundancy and increasing reliability of electricity networks. This presentation is aimed for people interested in power network-, transformer- and reliability modelling.

Short Bio:
Franz M. Hanser has carried out projects in the Siemens development department in Vienna, Austria. He was involved in the design process of money printers in Moedling, Austria and worked as a lecturer in a College of Higher Education. 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.