A New Model Solid State Transformer (NMSTT) is used as a controllable bidirectional transmission device that can transfer power between asynchoronous networks and functionally similar to back-to-back-HVDC . This paper describes the basic concept of a New Model Solid State Transformer (NMSTT). NMSTT is a new technology used for many applications like Traction , Distribution Systems, Power Quality Improvement, Power factor correction etc. A digital simulation model of NMSTT and its control system are developed using MATLAB. In this application field substantial weight and volume reduction can be achieved while providing additional functionality at the same time, also in this paper a survey of recent R&D efforts in this field are presented.
Keywords: Solid State Transformer (NMSTT), single phase model, three phase model , Intelligent Universal Transformer(IUT).