Solid State Transformers: An Emerging Trend in Power Quality Improvement

Abstract

To have a comprehensive review on the different SST topologies and analyses its application suitability. Presently different topologies of SST exist. Each topology has its own relative advantages which makes it suitable for specific applications. An analysis of the different topologies and its merits making it suitable for different areas of application is discussed in detail. A simulation of A Single Stage and a Three Stage SST topology are simulated in MATLAB and the results are discussed in this paper. The review clearly evolves the relative merits of SST over conventional transformers, the losses and efficiencies of SST seems to be very much acceptable in comparison to a conventional transformer. The advantages of various topologies namely Matrix type, Isolated back-end type, Isolated front-end type, Isolated modular multilevel converter and single cell makes its suitable for applications in AC dual active bridge, Traction, Electric Vehicles, Renewable Energy Sources. These topologies are less complex and offer high flexibility. SST has the main feature of reduced size, weight and volume, high power density, higher efficiency, fault isolation, reactive power compensation and improved power factor which makes it adaptable for various applications.