The Matrix Hybrid Solid State Transformer: Leveraging Three Phase Systems for Enhanced Grid Capabilities

Hybrid Solid State Transformers (HSSTs) are systems comprising of a fractional power solid-state transformer (SST) integrated with a standard full power line frequency transformer (LFT). HSSTs serve as an optimum compromise between the cost effectiveness and resiliency of the LFT and the controllability and responsiveness of the SST. Previous works [2][3] have studied the concept of a single-phase HSST using single-stage SST units. This paper discusses the prospect of expanding the concept to three-phase systems and exploring the additional control capabilities that it offers. The proposed system offers a control range akin to Unified Power Flow Controllers whilst using single stage isolated AC-AC topologies.