abstract

• This paper presents a modulation strategy for a neutral point clamped multilevel converter (NPC) used as transformerless inverter in a grid-connected applications. The selected topology is used with an output L filter to inject active power to the grid. The proposed modulation strategy is based in the conventional sinusoidal pulse width modulation (SPWM) for the NPC inverter. This SPWM allows to operate the converter with very low leakage currents, which are generated throughout the stray capacitances as well as accomplish with the international standards. To achieve this aim, also a current mode controller is used to guarantee that the inverter output current is in phase to the grid voltage. To assess the performance of the proposed SPWM in the grid-tied applications, simulation and experimental results are presented. © 2015 IEEE.

authors

• Escobar G.
• Limones C.A.
• Martínez Rodríguez Pánfilo Raymundo
• Mendoza-Mendoza J.D.J.
• Sosa J.M.
• Vazquez G.

publication date

• 2016-01-01

published in

• 2015 IEEE International Autumn Meeting on Power, Electronics and Computing, ROPEC 2015  Proceedings

keywords

• leaking current; modulation scheme; Photovoltaic system; transformerless grid-connected inverter Capacitance; Electric inverters; Leakage currents; Photovoltaic cells; Power converters; Pulse width modulation; Voltage control; Current mode controllers; Grid connected inverters; International standards; Modulation schemes; Neutral point clamped; Photovoltaic systems; Sinusoidal pulse width modulation; Transformerless inverters; Modulation

Digital Object Identifier (DOI)

• 10.1109/ROPEC.2015.7395150

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