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DC/DC Buck Power Converter as a Smooth Starter for a DC Motor based on a Hierarchical Control

DC/DC Buck Power Converter as a Smooth Starter for a DC Motor based on a Hierarchical Control

Abstract:

In  this  paper  a  smooth  starter,  based  on  a  DC/DC Buck power converter, for the angular velocity trajectory tracking task of a DC permanent magnet motor is presented. To this end, a hierarchical controller is designed, which is integrated with a  control  associated    with  the   DC   motor    based   on  differential flatness at the high level, and a control related to the DC/DCBuck  converter  based  on  a  cascade  control  scheme  at  the  low level. The control ofhigher level allows the DC motor angular velocity to track a desired trajectory and also provides the desired voltage profile that must be tracked by the   output voltage of the DC/DC Buck power converter. In order to assure the latter, a  cascade   control   at  the  low   level  is designed,    considering    asliding  mode    control   (SMC)     for  the   inner  current    loop a  proportional-integral  (PI)  control  for  the  outer  voltage  loop.

The hierarchical controller is tested through experiments Matlab, Simulink and   the DS1104    board   from space. The obtained results show that the desired angular velocity is well tracked under abrupt variations in the system parameters  and  that  the  controller  is  robust  in  such  operation  conditions,  confirming the  validity of the proposed controller.

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