Stability and performance investigation of fuzzy controlled LCL resonant converter in RTOS environment

Abstract

DC-DC power conversion used in industry, medical, military and newlineaerospace applications where the demand for compact power supplies grows newlinesignificantly. Over the past several years, efficiency, voltage regulation and newlinedynamic response have become the top concerns for power electronic newlineconverters. Efforts taken to increase the efficiency may lead to poor voltage newlineregulation as well as dynamic response and also higher cost. DC-AC newlineResonant Inverters are finding their applications in high frequency AC newlinedistributed power systems. Conventional PWM DC-DC converters have relatively low power newlinetransfer efficiency and poor voltage regulation. In contrast, resonant DC-DC newlineconverters have numerous advantages for DC-DC power conversions. newlineVariations of DC-DC Resonant Converters like LCL, LCC and LCL-T are newlinecommonly used. This research work is focused in finding out the best suited newlineconverters for the above applications. This thesis focuses on selecting a best converter topology by newlineconsidering the performance parameters like efficiency and THD. The best newlinesuited inverter is selected and the same is analyzed for DC-DC resonant converter. The steady state stability of the DC-DC resonant converters is newlineanalyzed using state space technique. newlineTo improve the performance of DC-DC resonant converter closed newlineloop control is implemented using PI and fuzzy controller, performance newlineparameters like efficiency, settling time, rise time and steady state error are newlineestimated by simulation software in MATLAB. The results are verified experimentally and the best performing newlineclosed loop controller for resonant converter is implemented using ARM newline(Advanced RISC Machine) processor LPC 2148 and its performance is newlineinvestigated. newline