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Theses Canada
Item – Theses Canada
Page Content
Item – Theses Canada
OCLC number
758059923
Link(s) to full text
LAC copy
LAC copy
Author
Dolan, Dale,1971-
Title
Modelling and performance evaluation of the Virtual Air Gap Variable Reactor.
Degree
Ph. D. -- University of Toronto, 2009
Publisher
Ottawa : Library and Archives Canada = Bibliothèque et Archives Canada, [2010]
Description
2 microfiches
Notes
Includes bibliographical references.
Abstract
<?Pub Inc> This thesis describes a novel device, the Virtual Air Gap Variable Reactor (VAG-VR), which is capable of producing a continuously variable reactance by locally saturating a small section of the reactor core via an embedded dc control winding. Variable Reactors have many applications in the power industry such as control of line power flow, voltage regulation, reactive line compensation and limiting inrush currents. A variable reactor is most commonly implemented as a thyristor controlled reactor (TCR) by switching in and out a constant reactance to achieve an averaged variable reactance. By using a virtual air gap, a continuously variable reactance is possible. The VAG-VR offers a better dynamic response, without introducing the harmonics created by the thyristor switching of a TCR. The VAG-VR gives low triplen harmonics and therefore allows control of reactive power in single phase or unbalanced three phase systems as would be required in the distribution system. An experimental prototype VAG-VR was developed to investigate three main performance measures: steady state performance, dynamic response and harmonic performance. Over the operating range of the VAG-VR inductance was varied from 100% to 9% of its original value. The dynamic response of the VAG-VR is approximately one tenth of a cycle. This compares favorably to a TCR which responds in approximately half a cycle. Harmonics are also shown to be significantly reduced in the VAG-VR compared to the TCR. A dynamic model of the VAG-VR, suitable for incorporation into power system simulations, was developed and validated. Parameters were determined both experimentally and through finite element method (FEM) simulations. Both experimental and simulation results indicate that the VAG-VR offers a technically viable alternative to the TCR.
ISBN
9780494590690
0494590696
Date modified:
2022-09-01