DC bus-based systems are envisioned as an enabling technology to integrate renewable energy sources, energy storage devices, and a variety of loads in a number of power management and distribution scenarios. The system design and integration challenges include accommodating heterogeneous components, the wide variability of operating conditions, and system stability issues arising from dynamical interactions between the components. This paper proposes a flexible, smart dc power management architecture based on identical digitally controlled bidirectional dc–dc modules that can be software configured to enable simple system design, exceptional system flexibility, and optimization of the use of available resources. Design of the reconfigurable digital control infrastructure of such versatile dc power system is discussed in detail from its system-level description to the low-level design of the digital compensators. Stability analysis of the dc bus voltage is also discussed, proving the robustness of the power architecture from a theoretical standpoint. The proposed approach is then demonstrated on an experimental dc power management system consisting of several 500 W, bidirectional dc–dc modules operating from a 24-V dc bus

This paper presents efficiency optimization and implementation of a bidirectional DC-DC converter based on the four-switch, non-inverting buck-boost configuration. The converter is intended for DC power systems to interface different sources or loads to a common DC bus, operating over a wide range of voltages. The number of converter phases, switching frequency, and inductor parameters are determined by an iterative efficiency optimization approach. The experimental 500W bidirectional converter operates from 12-38V at the source/load port to 21-32V at the bus port, with up to 97% efficiency.

No abstract