Queen's University Belfast

About: Queen's University Belfast is a education organization based out in Belfast, United Kingdom. It is known for research contribution in the topics: Population & Context (language use). The organization has 25457 authors who have published 55463 publications receiving 1751346 citations. The organization is also known as: Queen's College, Belfast & Queen's College.

Managing service quality in higher education: the role of the student as primary consumer

Abstract: Discusses aspects of current service quality theory in the context of British higher education (HE). Focuses on the role of the student as primary consumer of HE services (a relatively recent conceptualization in this country), and the implications of this for the management of service quality in higher education organizations (HEOs). Briefly discusses an exploratory study which has monitored a group of students′ expectations and perceptions of service quality over time. Because of its limited scope, the findings of this study may not be generalized to the student population as a whole. However, it does serve to highlight the need for HEOs to gather information on students′ expectations, not only during their time at university, but at the point of arrival and before, to manage students′ expectations from enrolment through to graduation, in order to align them as closely as possible with what can be delivered by way of service quality, for the student evaluation process, or upward appraisal to be dealt wi...

Dynamic Modeling and Control of DFIG-Based Wind Turbines Under Unbalanced Network Conditions

Abstract: This paper presents an analysis and control design of a doubly-fed induction generator (DFIG)-based wind generation system operating under unbalanced network conditions. A DFIG system model in the positive and negative synchronous reference frames is presented. Variations of stator active and reactive powers and generator torque are fully defined in the presence of negative sequence voltage and current. Alternative DFIG control targets during network unbalance, such as reducing stator current unbalance, torque, and power pulsations minimization, are identified. A rotor current control strategy based on positive and negative (dq) reference frames is used to provide precise control of the rotor positive and negative sequence currents. Simulation results using EMTDC/PSCAD are presented for a 2-MW DFIG wind generation system. It shows that conventional vector control of DFIG without considering network unbalance results in excessive oscillations on the stator active/reactive power, electromagnetic torque, and stator/rotor currents even with a small stator voltage unbalance. In contrast, with the proposed control strategy, enhanced system control and operation such as minimizing oscillations in either active power, or electromagnetic torque, or stator or rotor currents can be achieved