Abstract
In this paper, a robust sliding mode controller for the control of dc-dc buck converter is designed and analyzed. Dynamic equations describing the buck converter are derived and sliding mode controller is designed. A two-loop control is employed for a buck converter. The robustness of the sliding mode controlled buck converter system is tested for step load changes and input voltage variations. The theoretical predictions are validated by means of simulations. Matlab/Simulink is used for the simulations. The simulation results are presented. The buck converter is tested with operating point changes and parameter uncertainties. Fast dynamic response of the output voltage and robustness to load and input voltage variations are obtained.
Highlights
Electronic power converters are used as an actuator for electromechanical systems
The buck type dc-dc converters are used in applications where the required output voltage is lower than the source voltage
The controllers based on these techniques are simple to implement it is difficult to account the variation of system parameters, because of the dependence of small signal model parameters on the converter operating point [2]
Summary
Electronic power converters are used as an actuator for electromechanical systems. The buck type dc-dc converters are used in applications where the required output voltage is lower than the source voltage. Variations of system parameters and large signal transients such as those produced in the start up or against changes in the load, cannot be dealt with these techniques Multiloop control techniques, such as current mode control, have greatly improved the dynamic behavior, but the control design remains difficult especially for higher order converter topologies [3]. In order to obtain the desired response, the sliding mode technique changes the structure of the controller in response to the changing state of the system This is realized by the use of a high speed switching control forcing the trajectory of the system to move to and stay in a predetermined surface which is called sliding surface. Unlike other robust schemes, which are computationally intensive linear methods, analogue implementations or digital computation of sliding mode is simple
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