High Step Up Converter with Transformerless Inverter for Grid Integration

Abstract

Objectives: The objective of this paper is to design a high step up converter for PV applications. The output of the converter is applied to an inverter with less number of component counts. Methods: Coupled inductor is proposed in power electronic converters to increase high gain. The output of the dc-dc converter is given to the inverter. Finding: Simulation and hardware results show that the voltage stress in the passive components and the switches is reduced. Highly stable output voltage is obtained in the output due to high step up conversion. The converter can be operated in high step up mode without reaching the extreme limits. The leakage occurring in the coupled inductor is utilized and the problem due to reverse recovery voltage across the diode is reduced. Since low voltage is applied to MOSFET, conduction losses are less with higher efficiency. The inverter has a simple structure and operates at grid frequency. The inverter developed has low THD, better output waveform and the filter elements are of small size. The electromagnetic interference of the proposed inverter is very less. Novelty: The proposed inverter is designed with less number of switches. The proposed topology is simulated and the hardware is developed to know the feasibility of the converter.