Investigation on Operating Characteristics in Three Level Full Bridge AC–DC Converter using Different Control Strategies for Telecom

This paper presents the improvement of operating characteristics of three level full bridge ac–dc converter by proposing four different closed loop control techniques for telecom applications. Comparisons between different controllers have been considered to evaluate the power quality parameters with fast dynamic response under various operating conditions. Simulations have been done with Matlab/Simulink with four different voltage and current controllers, namely; PID with hysteresis current controller, Fuzzy Logic with hysteresis current controller (FL-HCC), Hysteresis Modulation based Sliding Mode Controller (HM-SMC) and Genetic Algorithm based Average Current Control (GA-ACC). Comparative analysis has been carried out with power factor, total harmonic distortion (THD) for various loading conditions upto 300 W. Based on the comparative analysis, GA-ACC technique provides better power quality parameters with improved dynamic response than the other three controllers. GA-ACC technique improved the power factor to 0.9911 and source current THD of 5.11% for converter. Also, voltage ripple and efficiency of the converter were calculated and tabulated under a wide range of load variations. Simulated results of the converter with GA-ACC have been validated with the experimental results.