Design and implementation of reduced-order sliding mode controller plus proportional double integral controller for negative output elementary super-lift Luo-converter

This study presents a simple sliding surface design of variable frequency-based reduced-order sliding mode controller (ROSMC) plus proportional double-integral controller (PDIC) for the negative output elementary super-lift Luo-converter (NOESLLC) operated in continuous conduction mode (CCM). Owing to the time-varying switched mode operation, the dynamic characteristics of the NOESLLC is non-linear and the developed ROSMC plus PDIC aims at improving the dynamic performance along with the inductor current and the output voltage regulation of the NOESLLC. The developed ROSMC is well suitable to the inherently variable-structured NOESLLC when represented in the reduced-order state-space average-based model. The designed PDIC eliminates the steady-state error and also excellent start-up response of NOESLLC despite of line and load variations. The performance of the developed controller is verified for its robustness to perform over a wide range of operating conditions through both in MATLAB/Simulink models as well as in the laboratory prototype with the comparative study of a typical ROSMC plus proportional-integral-controller. Simulation and experimental results are showed that ROSMC plus PDIC can achieve proficient output voltage and inductor current regulation at various working conditions.