SELF-TUNING ADAPTIVE CONTROLLER APPLIED TO THE BOOST CONVERTER VOLTAGE CONTROL

This paper presents the design and simulation tests of fixed and adaptive pole placement control techniques to the Boost converter voltage control. Due to the converter non-minimum phase characteristics, no zeros cancellation... [ view full abstract ]

This paper presents the design and simulation tests of fixed and adaptive pole placement control techniques to the Boost converter voltage control. Due to the converter non-minimum phase characteristics, no zeros cancellation was considered in the design procedures. An indirect self-tuning (STR) adaptive controller with online plant estimation and controller design was evaluated. A recursive least-squares method was used to identify the plant model in real time. Simulations results with a nonlinear model are presented and discussed. It can be noticed that for abrupt changes in the plant dynamics or operational condition, the STR adaptive control works better, rejecting disturbances and following the reference signal. In the other hand, the system with the fixed controller, after some specific load resistance change, cannot reject disturbances, leading the system to an oscillatory response.