A battery energy storage system (BESS) interface for a DC microgrid, featuring a partial rated power electronic converter, is proposed in this work. Universal s
To interconnect these systems to the electrical network, it is required to usepower electronic interfaces. Various power electronic converters for the interface between the electrochemical energy storage system and the electrical network have been described. These power converters are divided into standard, multilevel and multiport technology.
In the energy storage systems, a bidirectional AC/DC converter with a proper charging/discharging profile istypically required to transfer energy between the energy storage and the AC grid. The non-isolated single stage topologies are the simplest and most efficient for the interfacing of energy storages with AC systems.
With the additional possibility of energy storage via batteries, hybrid string inverters provide a good outlet to maximize the power utilization of the string input, and also provide an alternate pathway to supply the grid during night or low irradiation scenarios.
Power converter technologies This section focuses on the interfaces for the interconnection of the electrochemical energy storage systems with the electrical system. These interfaces are based on power electronic converters. They can be divided into three different categories: standard topologies, multilevel topologies and multiport topologies.
Multilevel power converters can be an important interface for theelectrochemical energy storage systems, since capacitors, batteries, fuel cells or other storage equipments can be used as the multiple DC voltage sources.