Design and Analysis of Flexible Power Electronic Transformer

Conventional transformers made of copper and iron are one of the most costly and heavy device in electrical system. The conventional transformers are suffering from the drawbacks like they are heavy and bulky, sensitive to harmonics, voltage drop under load condition and concerns regarding mineral oil. To overcome these drawbacks new power electronic based transformers are developed. Many drawbacks of conventional transformer have been removed by Power Electronic Transformer (PET). Still PETs are suffering from drawbacks like less effective for power quality improvement, bidirectional power flow is not possible, not expandable to achieve higher ratings and independent operation of ports are not possible. A new topology of Power Electronic Transformer (PET) can be developed consisting of multiple port to get much flexibility in terms of applications. This project proposes a new Flexible Power Electronic Transformer (FPET). Design of FPET is done based on modules and a common dc link for all the ports. Each module made of three parts, modulator (inverter/rectier), demodulator (cycloconverter) and High Frequency Isolation Transformer (HFIT).