Document
Generically Dependent Continuant
RDF description of Differential and common-mode model-based controller for the double-dual buck transformerless inverter - http://orbis.uaslp.mx/vivo/individual/scopus9052
Article
Information Content Entity
Differential and common-mode model-based controller for the double-dual buck transformerless inverter
Common-mode model; Common-mode voltage; Differential-mode model; Leakage-ground currents; Virtual ground Controllers; Electric grounding; Electric inverters; Renewable energy resources; Common mode currents; Common mode voltage; Common-mode model; Commonmode; Differential mode; Differential-mode model; Dual-boost; Leakage-ground current; Power stage; Virtual ground; DC-DC converters
This paper studies the double-dual DC-DC buck converter composed by two buck power stages in a double dual connection. This connection has been previously studied with the boost power stage in the well-known double dual boost converter. In contrast to the double dual boost, which can only be used as a dc-dc converter, the double dual buck can be used as an inverter. Furthermore, it has a non-pulsating voltage from the input terminals to the output terminals. This property is exploited to reduce the common-mode current, which is of special interest in transformer-less photovoltaic applications, among others. The study includes a model description of the system in terms of the differential and common-mode variables. A controller based on this model representation is proposed to alleviate the effects of the common-mode component of the inverter output voltage on the leakage ground current. The analysis shows that the double-dual buck based inverter in closed-loop with the proposed controller exhibits a considerably reduced leakage-ground current, i.e., an almost negligible common-mode current flowing through the ground-path. This natural benefit makes it an attractive option for applications such as grid-tied inverters for renewable energy systems and electric vehicles. An efficiency analysis is also provided considering a conventional modulation scheme. Finally, the system performance is evaluated in a 1 kW experimental setup. © 2021 Elsevier Ltd
International Journal of Electrical Power and Energy Systems