Alireza Tajfar

Alireza Tajfar
University of Illinois at Chicago | UIC · Department of Electrical and Computer Engineering

PhD

About

10
Publications
437
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52
Citations

Publications

Publications (10)
Article
A fault-tolerant scheme is proposed for a multistage isolated three-phase dc/ac matrix inverter (MI-TMI). It comprises a front-end dc/ac converter followed by an ac/pulsating-dc converter and a pulsating-dc/ac converter. The fault-tolerant scheme (FTS) ensures a consistent operation under different fault conditions in any of the three stages of the...
Article
This paper describes the control of an isolated multiphase high-frequency-link (HFL) matrix inverter by controlling the time evolution of its switching states (or, switching sequences). It is referred to as the optimal-switching-sequence-based control (OSBC). Unlike several conventional control schemes, where, typically the control is based on aver...
Article
The goal of this paper is to do a harmonic analysis for the output voltages, output currents, input-source currents, and pulsating-dc link voltage of an Isolated-Multistage High-Frequency-Link (HFL) inverter. A comparison between the frequency-spectrum for these variables plotted using the derived equations.
Conference Paper
This paper presents discontinuous modeling and design of an Optimal Sequence-Based-Controller (OSBC) for a grid-connected isolated high-frequency-link (HFL) converter. The OSBC directly controls the switching sequences of the power devices without the need for an intermediate pulse-width modulator as in conventional power converter control schemes....
Conference Paper
A modulation-based fault-tolerant scheme is outlined for an isolated photovoltaic high-frequency-link (HFL) inverter. It comprises a front end dc/pulsating-dc dc/ac converter followed by a unidirectional ac/dc converter followed by an ac/ac converter. The fault-tolerant scheme ensures operation under different types of fault conditions in the front...
Conference Paper
This paper1 outlines a methodology [1] to analyze the reaching condition of a class of switching system, which will be referred to as switching power converter (SPC), using a piecewise linear (PWL) model and multiple Lyapunov method. The reaching criteria for orbital existence are formulated as a linear matrix inequality (LMI), which is solved usin...
Conference Paper
This paper presents an Optimized Sequence-Based-Control (OSBC) scheme for an isolated multi-stage high-frequency-link (HFL) converter, which directly controls the switching sequences of the power devices without the need for an intermediate pulse-width modulator as in conventional power converter control schemes. OSBC is realized by solving an opti...
Article
Full-text available
A modulation-based soft-switching scheme is outlined for a high-frequency-link (HFL) inverter, which comprises a front-end HF isolated dc/ac converter followed by an ac/dc converter and an ac/ac converter. The proposed zero-voltage and zero-current switching (ZVZCS) scheme provides loss mitigation for all three legs of the ac/ac converter. Because...
Conference Paper
This paper outlines a controller that balances the flux of the isolation transformer in a multi-stage high-frequency-link (HFL) bi-directional inverter. It comprises a primary-side high-frequency (HF) dc/ac converter (referred to as Bridge I) followed by cascaded ac/pulsating-dc and pulsating-dc/ac converters (referred to as Bridge II and Bridge II...
Conference Paper
This paper deals with the issue of coordination of cascaded tap changers in radial distribution feeders. Poor coordination causes unnecessary operations of the tap changers and consequently unnecessary wear as well as poor voltage quality. A new fuzzy-rule-based controller that coordinates tap operations at different voltage levels is proposed and...

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