A high efficiency resonant DC-DC power converter-analysis and comparison of P&O and INC algorithms

This thesis paper explains the development of a single-switch resonant power converter and the comparison of different control strategies for photovoltaic (PV) generation applications. The circuit arrangement integrates a single-switch resonant dc-dc converter with zero-voltage-switching (ZVS) and an output diode operating with zero-current-switching (ZCS). Here the energy conversion is achieved through a single switch, which can reduce the cost of the switches and its control circuits. The single power switch can be controlled by either open loop pulse-width-modulation (PWM) techniques or Maximum power point Tracking (MPPT) techniques. The Input to the single-switch resonant power converter was supplied by a photovoltaic (PV) generation system. Due to low switching losses, the developed resonant boost converter offers very high efficiency than other conventional converters. The performance of the single switch resonant converter was analyzed, and the characteristic waveforms were plotted. With designed circuit parameters, the active switch can be operated with zero-voltage switching and an energy conversion efficiency of 97.8% can be achieved using closed loop control strategies. The comparisons of different closed loop control strategies were studied and the simulation results are presented with different atmospheric conditions.