Dual-Active Bridge Converter with Single Phase-Shift Control for Distribution Solid-State Transformer

Abstract

AbstractSolid-state transformer (SST) is essential equipment in electrical devices. Because of its compact size, it is often employed in high-power applications. Converter-based solid-state transformer has various features such as low weight and size, high frequency, and no core losses. These capabilities make a solid-state transformer replace the power distribution transformer. Bidirectional power flow is also possible in the SST, so it can be easily integrated with the utility grid and renewable energy storage or larger batteries. SST can be made up of three stages: rectifier, dual-active bridge (DAB) converter and inverter. DAB converter is a vital component of SST and is used for power transfer from one circuit to another circuit. Two h-bridges with eight IGBT switches and one high-frequency transformer (HFT) serve as isolation in the proposed DC-DC DAB converter. As an application of SST, a DAB converter was studied and simulated in a MATLAB Simulink environment and phase-shifted pulse generated from dSPACE 1103 platform. This work employs the single-phase shift (SPS) control approach to provide steady output and power transmission.KeywordsSolid-state transformer (SST)High-voltage DC (HVDC) linkLow-voltage DC (LVDC) linkSingle-phase shift (SPS)And dual-active bridge (DAB) converter