Electronically controlled capacitive energy storage element for DC grids

A Bidirectional DC-DC Convreter with Zero Voltage Switching Capability for Energy Storage Application

In this paper, a bidirectional DC-DC converter with high power density for energy storage application is proposed. The presented converter provides power transfer in both directions only with adjusting phase shift angle. Zero voltage switching (ZVS) in both turn on and turn off moments of all switches is the major capability of the converter that makes it suitable for high power applications. Z...

Cell Balancing of a Multi-Cell Battery Storage System for Renewable Energy DC Micro-Grids

The paper analyzes different concepts for active charge balancing for a multi-cell battery energy storage system used as a backbone for a DC micro grid. The storage system is based on a cascaded multi-level converter topology where each (lead-acid) battery is equipped with dedicated low-voltage buck type DC/DC converter stage placed directly at the battery terminals. To minimize the output ripp...

High-Efficiency Battery Storage Unit for Renewable Energy DC Micro-Grids

The paper describes a battery storage unit for small DC micro-grids based on a multi-cell topology. The system consists of a series arrangement of lead-acid type battery cells where each cell is equipped with an individual DC-DC buck converter located directly at the battery terminals. For minimizing the output ripple the cells are operated in interleaved PWM mode. With this the cell-to-cell wi...

Virtual Energy Storage System for Smart Grids

This paper forms a Virtual Energy Storage System (VESS) and validates that VESS is a cost-effective way to provide the function of energy storage through the utilization of the present network assets represented by flexible demand. As a solution to convert to low carbon cities, a VESS is firstly modelled to store and release energy in response to regulation signals by coordinating the demand re...

Bidirectional DC-DC Converters for Energy Storage Systems