An Improved Interleaved Boost Converter With PSO-Based Optimal Type-III Controller

This paper presents an improved interleaved boost converter (IBC) with optimal Type-III controller by utilizing voltage mode control. Due to the presence of several power switches in parallel path, the degree of freedom has been increased in IBC. Also, the IBC produces lower output voltage ripples, so the size and losses of the output filter can significantly be reduced compared with conventional BC. But due to the nonminimum phase problem of IBC, closed-loop bandwidth is restricted that causes slower converter dynamics. It is difficult for the conventional proportional-integral-differential controller to exhibit good performance with line, load changes, and parametric uncertainty. So an optimal Type-III controller is designed and implemented for achieving better closed-loop dynamic performance and stability. Initially, controller parameters have been designed by using the classical "k-factor" method, and then particle swarm optimization-based optimal Type-III controller is developed for the proposed IBC. The comparative closedloop performances of BC and IBC with classical and optimal Type-III controllers have been presented. The proposed control scheme by utilizing the optimized Type-III controller in IBC is newly introduced in this paper and has not been reported earlier. The overall control circuit diagram using voltage-mode controlled two-phase IBC has been implemented by simple analog control circuit and the cost of complete experimental setup is very cheap. Simulation and experimental results have been produced to show the efficacy of the proposed converter control system.