A master thesis from Aalborg University
Doubly Fed Induction Generator Fault Simulation
Author(s)
Term
4. term
Education
Publication year
2009
Submitted on
2009-06-10
Pages
0 pages
Abstract
This project focuses on modelling a wind turbine system. The machine used was a doubly fed induction generator (DFIG). Two fault ride through situations were investigated. As protection against short circuit transients, the dump resistor and the crowbar protection were modelled. An equivalent model was constructed for each case. Simplifications were made so as to have a system composed of grid, transformer, line and generator represented by elementary circuit elements (R, L, C and voltage sources). Equivalent circuit models were simplified so that the fault models may be used for synchronous machine parameters. The assumption that the mechanical system cannot respond during the short time of a three phased short circuit. The simplified crowbar and dump resistor models were compared to simulations constructed with complex library subsystems. The SimPower Systems Simulink library was used for this purpose. Premises for a space state model and transfer function of the system was made. Step and impulse response of the fault model are documented. This model is the first step towards stability analysis.
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