Print Email Facebook Twitter Control Algorithm for a BDFIG based Wind Turbine Drivetrain including Rotor Position Estimation. Title Control Algorithm for a BDFIG based Wind Turbine Drivetrain including Rotor Position Estimation. Author Vilmarsson, E. Contributor Polinder, H. (mentor) Strous, T.D. (mentor) Faculty Electrical Engineering, Mathematics and Computer Science Department Electrical Power Engineering Programme Electrical Power Processing Date 2014-11-04 Abstract As the need for electrical power from sustainable energy sources is continually increasing, electrical power generation from wind turbines continues to grow. A common type of electrical generators used in wind turbines is the Doubly Fed Induction Generator. However, this type of generator suffers from reliability issues associated with slip rings and brushes. The Brushless Doubly Fed Induction Generator (BDFIG) is an attractive choice to eliminate the drawbacks associated with slip rings and brushes. To commercialize the first BDFIG wind turbine a high performance control algorithm must be designed. This thesis focuses on the development of a control algorithm for a BDFIG based Wind Turbine Drivetrain (WTDT) system including sensorless position estimation. To explore the characteristics of the BDFIG, an equivalent circuit is developed to determine the machine steady state behavior. From the BDFIG equivalent circuit, a dynamic model of the machines is derived to form the basis for the control algorithm development. The control algorithm is based on a Field Orientated Control using a two cascaded control loops for control of active- and reactive power. WTDT reliability can be further improved by eliminating the rotor position sensor. In place of a position sensor, a method of estimating rotor position is required, such that a senorless control algorithm is achieved. Two methods for position estimation are investigated and theoretically validated. Indirect position estimation, though speed estimation, using Model Reference Adaptive System is developed and compared to direct position estimation through induced Back-Electromotive Force (B-EMF) in the stator windings. The developed sensorless control algorithm provides maximum wind power extraction during the expected operating range, where active- and reactive power control loops response are limited by mechanical inertia. The control algorithm uses the induced stator B-EMF for rotor position estimation. To test the validity of a sensorless control algorithm for a BDFIG, an experimental setup has been constructed. A sensorless current control of the Control Winding (CW) active- and reactive power has been experimentally validated, where the CW frequency is made to follow the CW stator flux. The experimental controller maintains synchronous mode of operation, for a limited speed range, due to presence of space harmonics. Subject BDFIGSensorless control To reference this document use: http://resolver.tudelft.nl/uuid:fbe5b8fc-63ac-442a-a045-8c5132d916fc Part of collection Student theses Document type master thesis Rights (c) 2014 Vilmarsson, E. Files PDF M.Sc_Thesis-Einar_Vilmarsson.pdf 7.45 MB Close viewer /islandora/object/uuid:fbe5b8fc-63ac-442a-a045-8c5132d916fc/datastream/OBJ/view