Family of multiport bidirectional DC–DC converters

Abstract

Multiport DC-DC converters are of potential interest in applications such as generation systems utilising multiple sustainable energy sources. A family of multiport bidirectional DC-DC converters derived from a general topology is presented. The topology shows a combination of DC-link and magnetic coupling. This structure makes use of both methods to interconnect multiple sources without the penalty of extra conversion or additional switches. The resulting converters have the advantage of being simple in topology and have a minimum number of power devices. The proposed general topology and basic cells show several possibilities to construct a multiport converter for particular applications and provide a solution to integrate diverse sources owing to their flexibility in structure. The system features a minimal number of conversion steps, low cost and compact packaging. In addition, the control and power management of the converter by a single digital processor is possible. The centralised control eliminates complicated communication structures that would be necessary in the conventional structure based on separate conversion stages. A control strategy based on classical control theory is proposed, showing a multiple PIDloop structure. The general topology and a set of three-port embodiments are detailed.

High-resolution phase shift and digital implementation of a fuel cell powered UPS system

“…Therefore the dc-dc stage for a fuel cell system has two power inputs -for the fuel cell and for the storage. A family of three-port converters presented in [2] can be employed. Fig.…”

A Comparison of Non-Isolated High-Gain Three-Port Converters for Hybrid Energy Storage Systems

“…All these issues, which are covered extensively in Section 2, make mandatory a search for simple, high-gain alternatives to interface low voltage ratings storage devices with the DC link [16][17][18]. The most used alternatives in high power applications include complex cascaded schemes (multistage solutions and tapped-inductor topologies), multilevel converters, or galvanically-isolated converters [19][20][21][22][23][24][25]. However, for small power levels, these solutions are not cost-competitive depending on the application.…”

An Isolated Multiport DC-DC Converter for Different Renewable Energy Sources

“…In numerous applications, it is required to connect multiple renewable energy sources of different types to a power grid or load. The multiport DC-DC converter has been proposed to efficient power management and grid integration for the multiple origins and development in a new era in a demand quality power in remote communities [8] [9]. The isolated dc-dc converter has multiple input ports for connecting different sources, such as photovoltaic (PV) panels, wind turbine generators (WTGs), fuel cells, etc., The multiport dc-dc converter not only regulates the low-level dc voltages of the sources to a constant high level required by the inverter but also provides other important control functions, such as maximum power point tracking (MPPT).…”