The control was implemented using an external static library interconnected with Dymola. the External Object approach for implementing objects in Modelica was also tested. The optimization algorithms developed for the wind turbine was done in a way so that no measurements of the wind speed are needed. The controls were developed so that they can achieve a number of different tasks such as Reactive Power Compensation and Island Control.
Models were implemented in Modelica using Dymola as tool. In order to model the power electronics involved in the system the Electric Power library (EPL) has been utilized. Models for the wind turbine were developed and tested. The models were in the end tested and evaluated by running a number of different simulations. The Different test cases consists of optimizing the power output; controlling the power output to a desired level and island operation; that is to power up a small grid on its own.
Keywords: wind power; power electronics; control; optimization; vertical wind power; Electrical Power library
Proceedings of the 9th International MODELICA Conference; September 3-5; 2012; Munich; Germany
Svenska-KraftnĂ¤t; â€śTechnical regulation 3.2.5 for wind power plants with a power output greater than 11 kw.â€ť Available at http://www.svk.se/Global/07_Tekniska_krav/Pdf/Foreskrifter/SvKFS2005_2.pdf 2011-10-24.
I. Catana; C.-A. Safta; and V. Panduru; â€śPower optimization control system of wind turbines by changing the pitch angle;â€ť U.P.B. Sci. Bull.; Series D; Vol. 72; Iss. 1; pp. 142â€“146; 2010.
A. Pintea; D.Popescu; and I. Pisica; â€śRobust model based control method for wind energy production;â€ť MCPLâ€™2010: 5th Conference on Management and Control of Production; Coimbra : Portugal (2010); 2010.
W. Hu; Y. Wang; X. Song; and Z. Wang; â€śDevelopment of vertical-axis wind turbine with asynchronus generator interconnected to the electric network;â€ť Electrical Machines and Systems; 2008. ICEMS 2008. International Conference on; pp. 2289â€“2293; 2008.
J. Petersson and P. Isaksson; â€śModeling and simulation of a vertical wind power plant in dymola/modelica.â€ť Masterâ€™s thesis; Department of Industrial Electrical Engineering and Automation; Lund University; 2011; http://www.iea.lth.se/publications/MS-Theses/Full%20document/5290_full_document.pdf.
J. Thongham; P. Bouchard; H. Ezzaidi; and M. Ouhrouche; â€śWind speed sensorless maximum power point tracking control of variable speed wind energy conversion systems;â€ť Electric Machines and Drives Conference; 2009. IEMDC â€™09. IEEE International; pp. 1832â€“1837; 2009.
M. AlakĂĽla and P. Karlsson; Power Electronics; Devices; Converters; Control and Applications. Department of Industrial Electrical Enginering and Automation; Lund Institute of Technology; 2010.
Modelica-Association; â€śModelica R - a unified object-oriented language for physical systemsmodeling.â€ť Available at https://www.modelica.org/documents/ModelicaSpec32.pdf 2011-08-23.