Conversor CC-CC bidirecional boost interleaved a capacitor chaveado

Abstract

The increasing use of renewable energy sources in direct current microgrids has driven the need for energy storage systems capable of ensuring stability, reliability, and power quality. In this context, Battery Energy Storage Systems (BESS) play a fundamental role in compensating for the intermittency of renewable sources and in managing the power flow within the microgrid. To enable the integration between energy storage systems and the DC bus, power electronic converters with high voltage gain, high efficiency, and reduced current ripple are required. Thus, this work presents the study, design, and sizing of a bidirectional interleaved Boost DC-DC converter with a switched-capacitor cell, applied to battery energy storage systems. The proposed topology combines the interleaving technique with a passive switched-capacitor cell, enabling an increase in static voltage gain, a reduction in the electrical stress imposed on semiconductor devices, and a decrease in current ripple in the energy storage elements. Initially, the concepts related to DC microgrids, BESS, bidirectional DC-DC converters, interleaving techniques, and switched-capacitor converters are presented. Subsequently, the theoretical analysis of the topology, the operating stages, and the sizing of the main converter components, including inductors and capacitors, are developed. The topology was validated through computational simulations, allowing the analysis of the main waveforms and the converter behavior under steady-state conditions. The obtained results demonstrate the feasibility of the proposed structure, highlighting the reduction of current ripple, the proper current sharing between the interleaved phases, and the increase in voltage gain provided by the switched-capacitor cell. Therefore, it is concluded that the studied topology presents promising characteristics for applications in energy storage systems and DC.