Document
Leakage-ground currents compensation in a transformerless HB-NPC topology using a DC-link-tied LC filter for photovoltaic applications
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
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
Generically Dependent Continuant
RDF description of Leakage-ground currents compensation in a transformerless HB-NPC topology using a DC-link-tied LC filter for photovoltaic applications - http://orbis.uaslp.mx/vivo/individual/scopus9322
Article
Information Content Entity
IEEE Journal of Emerging and Selected Topics in Power Electronics