Nonlinear Control of a Single Phase Unity Power Factor Rectifier: Design, Analysis, and Experimental Results

    Authors

    V. M. Rao; A. K. Jain; K. K. Reddy;A. Behal

    Comments

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    Abstract

    This brief presents nonlinear control strategies for a single quadrant unity power factor rectifier. First, a standard average model is utilized to design an adaptive controller and exponential stability of the controlled system is demonstrated via a Lyapunov stability argument. It is shown that: 1) the initial output voltage needs to be sufficiently large to ensure boundedness of the system in closed loop and 2) there is an upperbound on the rate of adaptation to guarantee system stability in the closed loop. It is shown that unmodeled non-idealities in the system lead to sub-par controller performance at low loads. To account for these, an improved system model is presented that accounts for the non-idealities by a constant disturbance matched with the control input. This is followed by a redesign of the controller to make it adaptive to such a disturbance. Finally, experimental results with the redesigned controller showing significantly enhanced performance at low load are presented.

    Journal Title

    Ieee Transactions on Control Systems Technology

    Volume

    16

    Issue/Number

    6

    Publication Date

    1-1-2008

    Document Type

    Article

    First Page

    1301

    Last Page

    1307

    WOS Identifier

    WOS:000260385200017

    ISSN

    1063-6536

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