An Improved Three-level DC-DC Boost Converter for Renewable energy Systems with High Gain

High gain DC-DC converters are essential candidates for integrating the low voltage photovoltaic (PV) sources to the grid-tied distributed power generation systems. In this paper, a simple non-isolated high gain three-level boost (TLB) converter is developed by the addition of two power switches and two diodes to the standard TLB converter. The voltage boosting and balancing is achieved by regulating the phase shift between the main switches. Moreover, the proposed converter achieves high gain without using the high frequency transformer, coupled inductor, and switched capacitor networks. Also, it has larger degree of freedom for duty ratio without any core saturation of the inductor. Therefore, use of the proposed converter in grid-tied distributed power generation systems enhances the reliability and efficiency of the overall system. PSIM 9.0 simulation toolbox is used to validate the performance of the proposed high gain converter.