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Stability analysis and control of bifurcations of parallel connected DC/DC converters using the monodromy matrix

Lookup NU author(s): majed Elbkosh, Professor Damian Giaouris, Professor Volker Pickert, Dr Bashar Zahawi, Professor Soumitro Banerjee



The paper studies the stability of parallel DC/DC converters using the concept of monodromy matrix (the state transition matrix for one complete cycle), whose eigenvalues are the Floquet multipliers. This matrix is composed of the state transition matrices for the smooth intervals and those across the switching events (called saltation matrices). We show that instabilities in this system can be caused by smooth as well as nonsmooth period doubling bifurcations, the latter occurring when the fundamental solution matrix undergoes a discontinuous jump as a periodic solution touches a nonsmooth hyper-surface of discontinuity. Based on the expression for the saltation matrices (the state transition matrices across switching events) we propose new controllers that can stabilize the period-1 operation by keeping the eigenvalues inside the unit circle. ©2008 IEEE.

Publication metadata

Author(s): Elbkosh A, Giaouris D, Pickert V, Zahawi B, Banerjee S

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: IEEE International Symposium on Circuits and Systems

Year of Conference: 2008

Pages: 556-559

Date deposited: 16/03/2010

ISSN: 9781424416844

Publisher: IEEE


DOI: 10.1109/ISCAS.2008.4541478