Open Access. Powered by Scholars. Published by Universities.®
- Discipline
Articles 1 - 3 of 3
Full-Text Articles in Engineering
Online Nonintrusive Condition Monitoring And Fault Detection For Wind Turbines, Xiang Gong
Online Nonintrusive Condition Monitoring And Fault Detection For Wind Turbines, Xiang Gong
Department of Electrical and Computer Engineering: Dissertations, Theses, and Student Research
The goal of this dissertation research is to develop online nonintrusive condition monitoring and fault detection methods for wind turbine generators (WTGs). The proposed methods use only the current measurements that have already been used by the control and protection systems of WTGs; no additional sensors or data acquisition devices are needed. Current-based condition monitoring and fault detection techniques have great economic benefits and the potential to be adopted by the wind energy industry. However, there are challenges in using current measurements for wind turbine condition monitoring and fault detection. First, it is a challenge to extract WTG fault signatures …
Prestressed Concrete Wind Turbine Supporting System, Ibrahim Lotfy
Prestressed Concrete Wind Turbine Supporting System, Ibrahim Lotfy
Department of Civil and Environmental Engineering: Dissertations, Theses, and Student Research
Wind energy is one of the most commercially developed and quickly evolving renewable energy technologies worldwide. Wind turbines are commonly supported on tubular steel towers. As the turbines are growing and the towers are elevating, an increase in structural strength and stiffness is required to withstand the applied forces. Recent studies established concrete as a more economic and durable alternative to steel especially when the tower height exceed 240ft. Presently, concrete towers are not common due to their perceived heavy weight and assembly complexity. One of the systems that have been mentioned in the literature consists of precast rings that …
Wind Speed And Rotor Position Sensorless Control For Direct-Drive Pmg Wind Turbines, Wei Qiao, Xu Yang, Xiang Gong
Wind Speed And Rotor Position Sensorless Control For Direct-Drive Pmg Wind Turbines, Wei Qiao, Xu Yang, Xiang Gong
Department of Electrical and Computer Engineering: Faculty Publications
This paper proposes a wind speed and rotor position sensorless control for wind turbines directly driving permanent magnetic generators (PMGs). A sliding-mode observer is designed to estimate the rotor position of the PMG by using the measured stator currents and the commanded stator voltages obtained from the control scheme of the machine-side converter of the PMG wind turbine. The rotor speed of the PMG (i.e., the turbine shaft speed) is estimated from its back electromotive force using a model adaptive reference system observer. Based on the measured output electrical power and estimated rotor speed of the PMG, the mechanical power …