Publication Date
2018
Document Type
Thesis
Committee Members
Pradeep Misra (Advisor), Luther Palmer III (Committee Member), Marian K. Kazimierczuk (Committee Member)
Degree Name
Master of Science in Electrical Engineering (MSEE)
Abstract
Due to inherent limitations posed by existence of zeros of a transfer function in the righthalfof the complex plane, known as non-minimum phase zeros, the issue of dealing withsuch zeros is extremely important in control of linear systems. Considerable literatureexists in control theory to try and minimize or eliminate the effect of non-minimum phasezeros. These include pole-zero cancellation, feedforward compensation, among others.These methods are only limited only to stable systems (systems with poles in the left halfof the complex plane); and will fail for systems that are unstable as well as non-minimumphase.This research focuses in designing feedforward compensators for unstable as well asnon-minimum phase. The key contribution is to decompose the transfer function of aSingle-Input Single-Output system into two sub-systems: a stable but non-minimum phasesubsystems and an unstable but minimum-phase subsystem. Then using root-locus techniques,the non-minimum phase zeros can be shifted to the left half plane, rendering thesystem minimum phase. Control techniques such as adaptive PID, model-reference control,which are not possible to implement on non-minimum phase systems can now beimplemented on the resulting system. Simulations were performed in MATLAB/Simulinkto validate the proposed compensation scheme.
Page Count
46
Department or Program
Department of Electrical Engineering
Year Degree Awarded
2018
Copyright
Copyright 2018, all rights reserved. My ETD will be available under the "Fair Use" terms of copyright law.
ORCID ID
0000-0001-5335-2999
