Inverting Nx and 2Nx non-isolated multilevel boost converter for renewable energy applications

Inverting Nx and 2Nx non-isolated multilevel boost converter (Inverting Nx and 2Nx MBC) configurations for renewable energy applications is proposed in this work. Proposed converters are suitable for DC Link renewable energy applications where several negative voltage levels are required with self-balancing such as photovoltaic (PV) multilevel inverters systems, hybrid electric vehicles. Voltage generated through such sources are very small in magnitude and needs to be boosted with high conversion ratio for practical use. The striking features of the proposed converter configurations are i) single control switch ii) continuous input current iii) high output voltage with moderate duty cycle iv) non-isolated topologies v) low rating component vi) for increasing the voltage levels according to the essential gain, number of diodes and capacitor circuitry has to be added without disturbing the main circuit vii) self balanced voltage levels. The mode of operation and effect of inductor Equivalent Series Resistance (ESR) on voltage conversion ratio and effect of diode is also discussed in detail. Proposed topology is superior to multilevel buck boost converter (Nx MBBC) because of the continuous input current and higher gain. Simulation results are presented with discussion and the results consistently showed good conformity with theoretical analysis.