Cascaded IMC & PI Digital Controller Comparison for Boost Converter with Non-Ideal Switch Modelled State-Space Averaging Method

In this study, two different closed-loop digital controllers have been implemented for a CCM boost converter and advantages of the controllers have been compared. The first one was designed as cascaded PI controller and second one designed as cascaded internal model controller (IMC). In the modelling process of the boost converter, the sate-space averaging technique has been used considering equivalent series resistances (ESR) and non-ideal switch models which impact the response of the converter system. In order to make the designed controllers appropriate for digital control technique, they have been discretized by bilinear transformation method and Matlab/Simulink simulations have been realized as if digital controllers have been implemented through a digital signal processor (DSP). The response of the controllers against load change, reference changes and input voltage change has been observed and compared.