Ali Altowati, Control Engineering Laboratory, Helsinki University of Technology
12th European Conference on Power Electronics and Applications
2 -5 September 2007, Aalborg, Denmark
The purpose of the conference is to provide a forum for presentation and discussion of emerging technology in power electronics and applications. In addition, it serves as a conduit for channelling advanced technology to the world. The EPE conference was held in Aalborg Congress and Culture Centre in Aalborg, Denmark.
The participants arrived from more than 48 regions and countries. Nearly 660 papers are covered (Finland was presented 15 papers), in addition to 5 tutorials. Professor Johanna Myrzik, from Technische Universiteit Eindhoven Electrical Power Systems, The Netherlands talked about Power Electronics and Control for Renewable Energy Systems. and the integration of renewable energy resources into the power supply network –particularly at the low-voltage distribution level. Professor Ing. Joachim Böcker Head of the group of Power Electronics and Electrical Drives at Paderborn University, Germany presented a nice work on modeling and control of PMSM with particular focus on the specifics of interior permanent magnet synchronous motors (IPMSM).
Several sessions were organised reviewing all areas where electrical power conversion and control is needed. Special attention were devoted to sustainable energy systems, clean surface transport, to the emergence of hydrogen as energy vector as well as to the most recent development in component technologies and converters’ topologies. The conference has covered almost all the theoretical and practical fields of power electronics, the lectures have emphasized the following recent trends in power electronics:
1- Power Converters Topologies and Design
2- Applications of Power Electronics in, Transmission and Distribution of Electrical Energy
3- Application of robust control methods to electrical systems
The last is my point of interest. A robust control design procedure based on QFT has been applied to switching-mode dc-dc buck converter operating in continuous and discontinues conduction mode. Two robust controllers for both continuous and discontinuous conduction mode along with prefilters were designed which met the frequency domain tracking specifications, robust stability, and disturbance rejection requirements. It has been demonstrated that this technique is suitable for application in this case, which presents uncertainties in the parameters. The bandwidth of the controller is compatible with the real limitations imposed by the existing continuous models of dc-to-dc switching converters. The redesign and tradeoffs between the system performance specifications and the controller complexity can easily be done, which provides the designer with more versatile solutions. The obtained QFT controller has shown to be effective, it does not require the use of gain scheduling, and it involves a simple low-order fixed controller. The time-domain simulation results show fast recovery of the desired output voltage with zero steady-state error.
The well organized Conference gave a very useful overview about the state of art in industrial technology, and about the ongoing research in the university laboratories and in research centres. The Conference provided a nice opportunity to get acquainted with other researchers and to have scientific discussion about the power electronics.
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Aalborg, city of Wind Power Plants
During the lecture session