Title :
A transformerless, single DC-input, DC-AC 7-levels boost converter for PV applications
Author :
Rodriguez-Rodriguez, J.R. ; Moreno-Goytia, E.L. ; Venegas-Rebollar, V.
Author_Institution :
Posgrado en Ing. Electr., Inst. Tecnol. de Morelia, Morelia, Mexico
Abstract :
This paper introduces a new transformerless multilevel topology for PV arrays systems. The 7-levels structure ensembles the best characteristics of three basic topologies to obtain a step-up DC-AC converter with only a single DC input and nine power switches. The advantages of the proposed structure are a higher power density, lower harmonic distortion and higher efficiency as no transformer is needed for the grid interconnection. The topology does not require a control scheme for balancing the capacitors voltage. The cases of study clearly show the capabilities of the combination, in cascade, of a DC-DC multilevel boost converter, a DC DC multilevel buck converter and an H-bridge.
Keywords :
DC-AC power convertors; DC-DC power convertors; harmonic distortion; photovoltaic power systems; DC-AC 7-level boost converter; H-bridge; PV array application; grid interconnection; harmonic distortion; power density; step-up DC-AC converter; transformerless multilevel topology; Capacitors; Harmonic distortion; Inverters; Modulation; Topology; Transfer functions; Voltage control; Boost Multilevel; Buck Multilevel; H-Bridge; Transformerless;
Conference_Titel :
North American Power Symposium (NAPS), 2011
Conference_Location :
Boston, MA
Print_ISBN :
978-1-4577-0417-8
Electronic_ISBN :
978-1-4577-0418-5
DOI :
10.1109/NAPS.2011.6025108
