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Sood V.K.,UOIT
2010 Joint International Conference on Power Electronics, Drives and Energy Systems, PEDES 2010 and 2010 Power India | Year: 2010

In this paper, a hybrid power flow controller (HPFC) configuration for flexible AC transmission system (FACTS) is evaluated. It consists of a reactive power compensator and two voltage source converters (VSCs). Here the VSCs can exchange power through a common DC circuit. The system is simulated using Electro Magnetic Transients Program - Restructured Version (EMTP-RV). A dynamic control scheme is presented. The validity of the mathematical model and feasibility of active and reactive power flow in the controller has been evaluated. Simulation results present the performance of HPFC. © 2010 IEEE. Source


Sood V.,UOIT | Patel H.,Gujarat University
2010 Joint International Conference on Power Electronics, Drives and Energy Systems, PEDES 2010 and 2010 Power India | Year: 2010

This paper presents a detailed comparison of direct and vector control strategies for a Voltage Source Converter (VSC) operated HVDC transmission system. The system is, simulated with EMTP-RV simulation package, to investigate its operational performance. The simulation results with both control strategies shows a satisfactory performance under steady state behaviour, but, due to cross-coupling between the control parameters direct control technique is unable to provide independent control of active power, reactive power and AC voltage. This can provide non-optimal recovery behaviour under transient and dynamic conditions. The simulation results provided validate the vector control strategy for optimal independent control of system parameters such as active and reactive power during transient and steady state operation. © 2010 IEEE. Source


Youssef M.Z.,UOIT | Orabi M.,Aswan University | Tarbouchi M.,Royal Military College of Canada
Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC | Year: 2015

This paper presents a new trend in the transportation industry to adopt the multilevel inverter-based propulsion systems and gives the design procedure of a new dc/ac 3-phase 7-level inverter for powering rail metro cars. The novelty of the proposed inverter lies within the proposed control methodology, which uses a new switching pattern that guarantees a modified space vector pulse with modulation (SVPWM) to eliminate the unwanted harmonics from the output voltage. The new algorithm is developed using numerical iterative solution using a modified Newton-Raphson technique that was downloaded to the processor using digital signal processing (DSP) code. The mathematical model is simple but proven to be effective. As a result, a higher operating efficiency at full-load of 98.5% is achieved. Analytical, simulation and experimental results of a 1500Vdc/700Vac 400kW converter are presented to offer the proof of concept. The converter provides real estate savings for the train under floor layout, higher operating efficiency as well as better cost than the conventional two level pulse width modulated (PWM) hard switched converters. © 2015 IEEE. Source


Scarfo N.,UOIT
Proceedings of the IADIS International Conference e-Learning 2011, Part of the IADIS Multi Conference on Computer Science and Information Systems 2011, MCCSIS 2011 | Year: 2011

This paper examines the technological and pedagogical challenges involved in adapting a well-established face-to-face educational law and ethics course into a hybrid course containing online modules. Placed against the backdrop of Downes (2006) and Siemens (2006) connective learning models, the study identifies some of the key constraints that exist within a teacher education programs that affect the ability to use e-learning to supporting authentic learning and interaction in an online environment. The study focuses on the level of interactivity and engagement achieved during online modules and examines the impact of institutional constraints on the ability of of the hybrid model of delivery to support the instructional goals of the course. Findings from the study highlight a strong preference for face-to-face interaction and explore the role that student perception and program planning play in the perceived value of the online learning experience. © 2011 IADIS. Source


Hassanzadeh O.,IBM | Pu K.Q.,UOIT | Yeganeh S.H.,University of Toronto | Miller R.J.,University of Toronto | And 3 more authors.
Proceedings of the VLDB Endowment | Year: 2013

A basic step in integration is the identification of linkage points, i.e., finding attributes that are shared (or related) between data sources, and that can be used to match records or entities across sources. This is usually performed using a match operator, that associates attributes of one database to another. However, the massive growth in the amount and variety of unstructured and semistructured data on theWeb has created new challenges for this task. Such data sources often do not have a fixed pre-defined schema and contain large numbers of diverse attributes. Furthermore, the end goal is not schema alignment as these schemas may be too heterogeneous (and dynamic) to meaningfully align. Rather, the goal is to align any overlapping data shared by these sources. We will show that even attributes with different meanings (that would not qualify as schema matches) can sometimes be useful in aligning data. The solution we propose in this paper replaces the basic schemamatching step with a more complex instance-based schema analysis and linkage discovery. We present a framework consisting of a library of efficient lexical analyzers and similarity functions, and a set of search algorithms for effective and efficient identification of linkage points over Web data. We experimentally evaluate the effectiveness of our proposed algorithms in real-world integration scenarios in several domains. © 2013 VLDB Endowment. Source

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