In a Hybrid Energy System (HES), bidirectional converters are used to transfer energy between sources and batteries. These converters play an important role in supporting and recovering energy for the battery. The suggested converter has the feature of both bidirectional and multiport structures.
For the rated load state, it achieved power efficiencies of 97.7% in the step-up mode and 97.8% in the step-down mode. The study made the following conclusions: The proposed converter can be used in a grid-connected battery energy storage device that needs high power density and performance.
The continuous flow of power is an important concern when it comes to renewable energy systems; therefore, bidirectional DC-DC converters are employed to interface storage systems with the energy resource and load by reducing or eliminating the fluctuation in the output of renewable energy systems as a result of variations in climate conditions.
Such a converter must have bidirectional power flow capability with flexible control in all operating modes. In HEV applications, BDCs are required to link different dc voltage buses and transfer energy between them. For example, a BDC is used to exchange energy between main batteries (200-300V) and the drive motor with 500V dc link.
The power transmission of bidirectional converters is proportional to the number of switches, and the high productivity and high power density of this topology make it appealing to hybrid energy systems . Figure 12. Isolated DAFB bidirectional DC-DC converter .
Applications of bi-directional converters 1.1. Power storage applications 1.2. EV charger applications Bi-directional topologies and associated reference designs 2.1. DC/DC topologies 2.1.1. Active clamp current fed full-bridge 2.1.2. DAB 2.1.3. Fixed frequency LLC 2.1.4. Phase shift LLC 2.2. AC/DC topologies