abstract

• Single-phase cascade multilevel inverters (CMI) allow to feed loads with multiple voltage levels, which reduces the total harmonic distortion (THD) when compared with traditional three-level inverters. Reducing the THD makes the filter size smaller and cheaper which contributes to improve the overall performance of the power converter. These advantages make CMI attractive in several applications like: photovoltaic (PV) systems, active filtering, motor drives, among others. Transformerless grid-connected PV systems require a specific design of the pulse width modulation (PWM) strategy in order to deal with the common mode current (CMC) issue. Then, five levels CMI can be controlled by using different PWM strategies since the electrical circuit can be configured in multiple combinations. In this paper, a PWM sequence is proposed in order to deal with CMC issue in a CMI devoted to transformerless PV systems. Numerical and experimental results show the proper operation of the inverter and the reduction of the CMC. © 2018 IEEE.

authors

• Martínez Rodríguez Pánfilo Raymundo
• Rodriguez-Larios L.
• Sosa J.M.
• Valdéz Fernández Andrés Alejandro
• Vazquez G.

publication date

• 2019-01-01

published in

• 2018 IEEE International Autumn Meeting on Power, Electronics and Computing, ROPEC 2018  Proceedings

keywords

• Electric drives; Pulse width modulation; Voltage control; Cascade multilevel inverter; Common mode currents; Electrical circuit; Grid connected PV system; Grid-connected PV; Photovoltaic systems; Three-level inverters; Total harmonic distortion (THD); Electric inverters

Digital Object Identifier (DOI)

• 10.1109/ROPEC.2018.8661408

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