Integration Battery Energy Storage Using T- Type Solid State Transformer Based Multilevel Inverter

Abstract

Storage technologies are essential for preserving the renewable grid power balance between generation and consumption. In this research, a solid-state transformer (SST) based T-type multilevel inverter (MLI) is proposed for the medium/high voltage integration of large-scale battery energy storage (BES). For any turn ratio, the proposed SST-MLI generates 25 levels with fewer switching devices and SSTs. A novel dynamic phase shift controller (NDPSC) is also being developed for the proposed BES system. The NDPSC controller regulates active and reactive power by maintaining the battery's health. The NDPSC controller uses two gain control factors tuned to produce a fast response without overshooting. The proposed battery storage system's dynamic behavior is simulated in MATLAB/Simulink for various active and reactive power variations and experimentally validated in a low-power laboratory prototype system.