DC-link Capacitor Minimization In Residential Energy Router Through Battery Utilization

Ac to dc conversion in a single-phase ac-dc voltage source converters and current source converters produce double frequency ripple power on the dc side. This ripple power multiplies the dc-link capacitor size by increasing its operating temperature. Different active and passive solutions are suggested to decouple this ripple power. In this paper, by reviewing the charging-current frequency effect on the li-ion battery performance and its lifetime, we find out ripple-power utilization for charging li-ion battery can be practical. As a result, we propose to decouple the ripple power by the Li-ion battery in a residential energy router system. This energy router system is an interface among the main grid, loads, renewable energy resources, and energy storage of a house.