Modeling and control of emerging DC-DC topologies for renewable energy applications

Abstract

The main topic in this dissertation is the penetration of renewable energy into the grid, since it has been increasing considerably over the years. In this topic, it is involve the study of DC-DC and DC-AC power conversion. In this dissertation the DC-DC power conversion stage is studied in detail. Conventional DC-DC topologies are used in the industry in this DC-DC power conversion stage, however, these topologies have some limitations. For that reason, new topologies have been emerging, their characteristics represent an improvement over the limitations of conventional DC-DC topologies. Considering that, in this dissertation some of the emerging topologies, their modeling and control are studied. Moreover, it will be discuss how the interconnection of the renewable energy source is usually made, and how a stepping-up converter is incorporated into the system, and what are the main characteristics of this converter in order to have proper exploitation of the source. Also, it is considered that renewable energy sources are intermittent sources, which is undesirable since it may imply interruptions to the electrical supply, to overcome this issue, a set of controllers are proposed. Finally, not only the theoretical aspects are discussed, but also the hardware implications.