Advanced Control Methodology for Intelligent Universal Transformers based on Fuzzy Logic Controllers

Intelligent Universal Transformer (IUT) is a power electronic base transformer introducing for Advanced Distribution Automation (ADA) in future. ADA is the state of art employing the new architecture based on both the flexible electrical network and open communication construction comprise the Future Distribution System. Fuzzy control is a method based on fuzzy logic concept emphasizes on fuzzy algorithms formulated by linguistically rules. Model free system, nonlinearity, robustness and flexibility under parameter variations are the benefit advantages of using fuzzy logic controllers. In this approach four layers IUT topology with the fuzzy logic controller have been considered for evolving the stability, reducing the uncertainty and enhancing the efficiency of whole system. Fuzzy logic control schemes are proposed for employing current source controllers in IGBT inverters at input stage and DC voltage control source in output stage. Real time voltage regulation, DC voltage option, automatic sag correction, reliable diverse power as 400Hz service, three-phase power from a single phase line, Harmonic Filtering, Flicker mitigation, options for energy storage , dynamic system monitoring and robustness under load disturbances are the resulting benefits of using IUT four layers topology and fuzzy logic controllers . Key-Words: ADA, IUT, IED, power electronic, FLC, membership function