Publication Date
5-2019
Date of Final Oral Examination (Defense)
4-12-2019
Type of Culminating Activity
Dissertation
Degree Title
Doctor of Philosophy in Electrical and Computer Engineering
Department Filter
Electrical and Computer Engineering
Department
Electrical and Computer Engineering
Supervisory Committee Chair
Said Ahmed-Zaid, Ph.D.
Supervisory Committee Member
Nader Rafla, Ph.D.
Supervisory Committee Member
Thad Welch, Ph.D.
Abstract
Variable-frequency drives (VFDs) are widely used for control of electrical machines such as induction motors (IMs) or permanent-magnet synchronous motors (PMSMs). Similar to other electrical devices, these drives are subject to failure. Several types of faults are associated with VFDs. For instance, faults such as an open-switch fault, a short-circuit switch fault are the two common faults in VFDs. These faults can yield catastrophic consequences if proper remedial action is not taken.
A unique remedial topology for the post-fault period and a new pulse width modulation (PWM) strategy are proposed so that not only the motor drive can continue the operation, but also this new method reduces the common-mode voltage of the three-phase inverter.
In this work, switch failures are investigated, and a new solution to detect open-switch faults are proposed using an algorithm based on current analyses. Extensive simulations are done to simulate a real system response during the post-fault phase on different operating points and at various torque loads. These simulation results were used to develop a detection algorithm. These results were also verified using an experimental setup. The proposed method offers an efficient solution for fault detection in VFDs. Firstly, a fast response detection of a failure in an inverter is possible. Second, it provides an alternative back-up method for fault detection in electric drive systems.
DOI
https://doi.org/10/18122/td/1553/boisestate
Recommended Citation
Mohammadi, Danyal, "Real-Time Fault Detection and Reconfiguration of a Three-Phase Electric Motor Drive" (2019). Boise State University Theses and Dissertations. 1553.
https://doi.org/10/18122/td/1553/boisestate
Included in
Controls and Control Theory Commons, Electrical and Electronics Commons, Power and Energy Commons, VLSI and Circuits, Embedded and Hardware Systems Commons
