AC/DC Converter based on Dual Active Bridge with Reactive Power Management

The dual-active-bridge (DAB) converter has extended its use due to the important features that make it suitable for a wide range of applications. The Solid-State Transformer (SST) in Smart Transformer (ST) application uses the DAB converter as the core of the system. One of the most important features is reactive power management because it allows the system to control the input voltage amplitude. In this paper, an ac/dc converter based on the DAB converter with reactive power management is described. The first stage is comprised of a synchronous rectifier, reducing the system complexity in comparison with its PWM rectifier counterpart. The DAB converter comprises the second stage and it draws or delivers current, allowing a low input current THD and variable power factor. The design procedure is shown as well as simulation results.