Stromrichtertechnik für Windkraftanlagen kleiner Leistung

112 pages 132 figures, 57 references.Technische Universitat Ilmenau, Fakultat fur Elektrotechnik und Informationstechnik,Dissertation A, 2007The main matter of the presented study is the comparison of two different system configurations for small-scale wind power plants (2kW). A synchronous machine with permanent magnets was used as generator. The two studied configurations differ in their way of feeding the electrical power from the generator to the DC-link capacitor. The first topology deploys a conventional six-pulse voltage inverter with IGBTs. For the second topology a diode bridge and a conventional boost-converter is used.To evaluate the two system configurations the development and parameterisation of a generator model was necessary. Based on the model, control strategies for both topologies were deduced. These control strategies were developed based on the concept of field oriented control of synchronous generators. They regard the different topological specifics of the two system configurations.An important criterion for the comparison of both configurations was the achievable energy efficiency. To diagnose the efficiency with adequate accuracy the losses occurring in the system had to be calculated. Therefore, one focus of the presented study was the identification of the conduction and switching losses of the semiconductor elements by simulations.The development of a superordinated MPP-control allowed further improvement of the system. Another object of investigation were the different possibilities to feed the generated power of the wind plant to the grid or to a battery system.