abstract

• In this paper, a solution to mitigate the leakage-ground currents in a grid-tied H-bridge neutral-point clamped inverter is presented. This solution consists in splitting the LC filter capacitor and connecting each capacitor to a DC-link terminal. The proposal is referred to as the DC-link-tied LC output filter. Out of this hardware modification, it is not necessary to increase the number of switches nor design a new modulation scheme. Furthermore, a formal analysis is provided based on the common-mode model describing the role of this particular connection of the output LC filter on the minimization of the leakage-ground current. In addition, a closed loop control strategy has been implemented to allow testing the prototype connected to the electrical grid. The mitigation of the leakage-ground currents has been evaluated under this condition as well. To validate the proposed circuit modification, numerical simulations and experimental tests have been performed in a 1 kW laboratory prototype of the H-bridge neutral-point clamped inverter with the DC-link-tied LC filter solution. IEEE

authors

• Escobar G.
• Iturriaga-Medina S.
• Langarica Córdoba Diego
• Martínez Rodríguez Pánfilo Raymundo
• Mayo-Maldonado J.C.
• Sosa-Zuniga J.M.
• Vazquez-Guzman G.

publication date

• 2021-01-01

published in

• IEEE Journal of Emerging and Selected Topics in Power Electronics  Journal

keywords

• Common-mode model; Leakage-ground current; Multilevel photovoltaic inverter; Transformerless inverter Bandpass filters; Electric inverters; Passive filters; Common-mode model; Dc-link; Ground currents; H-bridges; LC filter; Leakage-ground current; Multilevel photovoltaic inverte; Multilevels; Photovoltaic inverters; Transformerless inverters; Bridge circuits

Digital Object Identifier (DOI)

• 10.1109/JESTPE.2021.3132239

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