An innovative single switch dc-dc converter with high voltage achievement with ability of solar PV based power generation systems

In recent years, distributed power generation using renewable energy sources has received greater attention due to the rapid exhaustion of fossil fuels and increased emission of greenhouse gases. Solar energy is one of the promising and clean renewable energy resources for electric power generation. The voltage available from the different series-parallel combination of solar PV cell is of the order of 20–60 V. Hence, a suitable power converter is required to interface the PV panels with the load. In many applications like solar based generation system, comparatively high voltage is achieved by dc-dc boost derived converter. Isolated dc-dc converters are not preferable solution for high voltage gain applications like, solar based power generation system due the problems like saturation in high frequency transformer core, low efficiency, bulk in size etc .This paper shows a single switch non-isolated DC-DC converter with high voltage obtain capability for solar photovoltaic (PV) applications. The suggested converter is synthesized from passive switched inductor (SI) and switched capacitor (SC) topologies and combined with an extra voltage boost capacitor to increase the voltage gain. Due to the converter structure and approved gain extension technique, the voltage stress on the switch and three diodes is 50% of the output voltage, while the residual diodes experience a voltage stress of only 25% of the output voltage. Experimental results gained from a 34 V/380 V, 200W prototype converter validate the suggested concept, adopted design procedure and indicates the fact that the proposed converter functions at a full load efficiency of 93%. Further, the suggested converter offers better constituent operation compared to some current converters. The salient features of the proposed converter make it a promising candidate for interfacing theinput PV source with a 380 V DC bus or a DC micro grid.

Keywords:

Solar PV , Non-isolated , dc-dc converter , High voltage gain