Papers by Dietmar Winkler:

Title: Modelling of a Hydro Power Station in an Island Operation
Authors: Arndís Magnúsdóttir and Dietmar Winkler
Abstract:There is a strong focus on new renewable energy sources, such as, solar power, wind energy and biomass, in the con- text of reducing carbon emissions. Because of its maturity, hydropower is often overlooked. However, there is an era of hydro oriented research in improving many aspects of this well established technology. Representing a physical system of a hydropower plant by mathematical models can serve as a powerful tool for analysing and predicting the system performance during disturbances. Furthermore it can create opportunities in investigating more advanced control method. A simulation model of a reference hydropower station located in northwest of Iceland was implemented using the modelling language Modelica. The main simulation scenarios of interest were: 20 % load rejection, worst-case scenario of full shut-down and pressure rise in the pressure shaft due to the water hammer effect. This paper will show that the different simulation scenarios were successfully carried out based on the given the data available of the Fossárvirkjun power plant. The load rejection simulation gave expected results and was verified against a reference results from manufacturer.
Links: Full paper

---

Title: modelica.university: A Platform for Interactive Modelica Content
Authors: Michael Tiller and Dietmar Winkler
Abstract:The web was conceived of as a medium for the expression and exploration of scientific and engineering ideas. However, observing the actual content on the web, an alien race might presume that the primary impetus for web technologies was the dessimention of cat videos or celebrity gossip. Fundamentally, HTML and HTTP are certainly sufficient for the creation of scientific and engineering content just as they are for the creation of online magazines and websites. But while a number of "content management systems" have been created to facilitate the publication of prose, there are very few such tools that cater to making it easy to create scientific and engineering content. In this paper, we will present a platform which can be thought of as a content management system for scientific and engineering content. We will start by describing what we believe to be the fundamental requirements for such a system. From there, we will discuss two different applications built on this platform. The first is an interactive tutorial for teaching the basics of the Modelica languages and the other is an example application that involves creating interactive content for use in an engineering course on hydro-electric power generation. This content will be published on the modelica.university domain and we invite others to contribute additional content to the site.
Links: Full paper