Upcoming Seminar
Monday October 12, 2009 - Rm. 50, Everitt Lab by Siew-Chong Tan
A fast response low harmonic distortion control scheme that combines the useful features of the sliding mode control and the repetitive control to achieve excellent transient and steady-state system performances in voltage source inverters is proposed. The principle of s domain equivalent control is adopted to integrate the two methodologies and to facilitate the design and analysis of the proposed scheme. An optional specific low-pass filter can be introduced into the system to improve the transient response of the regulation. Experimental results show that fast dynamic responses are achieved through the sliding mode control, whereas low harmonic distortions are achieved through the repetitive control.
A FRAMEWORK FOR ASSESSING THE RELIABILITY OF WIND ENERGY CONVERSION SYSTEMSMonday October 12, 2009 - Rm. 50, Everitt Lab by Sebastian Smater
During the last decade, wind power generation has seen a rapid development. According to U.S. Department of Energy achieving 20% of wind power penetration in the U.S. by 2030 will require: i) enhancement of the transmission infrastructure, ii) improvement of reliability and operability of wind systems and iii) increased U.S. manufacturing capacity of wind generation equipment. This research will concentrate on improvement of reliability and operability of WECS.
The increased penetration of wind energy into the grid imposes new operating conditions on power systems. This change requires development of an adequate reliability framework. This study proposes a framework for assessing wind energy conversion systems (WECS) reliability in the face of external disturbances, e.g. grid fault, and internal component faults. The framework is illustrated using a detailed model of type C WECS - doubly fed induction generator with corresponding constant and variable parameters in a simplified grid model. Fault parameters and performance requirements essential to reliability measurements were included in the simulation. The proposed framework allows a quantitative analysis of WECS designs; analysis of WECS control schemes, e.g. fault ride-through mechanisms; discovery of key parameters that influence overall WECS reliability; and computation of WECS reliability with respect to different grid codes/performance requirements.