• A.A.KHAJA MOINUDDIN
• SASANAM ANIL KUMAR
• VELUPALLI SAI
• Mr.M.V. RAGHAVENDRA REDDY

This paper presents a new family of converters for high power interconnection of dc buses with different voltage levels. Proposed converters achieve high voltage dc-dc conversion without an intermediate ac conversion stage. This function is implemented without series connection of active switches, or the use of isolation transformers. The salient features of proposed converters are (i) design and construction simplicity, (ii) low switching losses through soft turn-on and soft turn-off, (iii) single stage dc-dc conversion without high-current chopping, (iv) modular structure, (v) equal voltage sharing among the converter modules. Three converter circuits are investigated. The first performs unidirectional power transfer from a dc bus with higher voltage to a dc bus with lower voltage. The second performs unidirectional power transfer from a dc bus with lower voltage to a dc bus with higher voltage. Both converters are suitable for interconnecting single pole dc buses with same polarity, or double pole dc buses. A third converter is also presented which performs the function of either the first or the second converter with polarity reversal. The third converter is suitable for interconnecting single pole dc buses with different polarities, or double pole dc buses. By hybrid integration of the proposed three converters, the thesis also investigates other topologies for bidirectional power transfer between two dc buses

Low frequency modulation, multi-level inverter, multi-level inverter comparison factor, sinusoidal pulse-width modulation(SPWM),symmetricalDCpowersources,three-phase

"A NOVEL NINE LEVEL MODULAR MULTILEVEL VOLTAGE SOURCE INVERTER", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 3, page no.26-30, March-2019, Available :http://www.jetir.org/papers/JETIRAN06004.pdf

"A NOVEL NINE LEVEL MODULAR MULTILEVEL VOLTAGE SOURCE INVERTER", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 3, page no. pp26-30, March-2019, Available at : http://www.jetir.org/papers/JETIRAN06004.pdf