Feasibility study of Fractional Frequency Transmission System

A new transmission system- Fractional Frequency Transmission System (FFTS) proposed in the literature is a promising alternative to High-Voltage (HV), High Voltage Direct Current (HVDC) and Flexible AC Transmission System (FACTS) technology to increase power transfer capability and to improve voltage profile of the transmission line. In this paper three studies of FFTS are presented to investigate its feasibility. Firstly, a comparative analysis of performance of FFTS and conventional 50 Hz line is presented. Performance is evaluated by using power flow equations. The results show that the power transfer capability of FFTS line is several multiple of than that of conventional 50 Hz line. Secondly, a comparative analysis of stability of FFTS and conventional 50 Hz system is presented. Magnetic frequency changer is employed as frequency tripler. The simulation model of FFTS and conventional 50 Hz system is developed in Simulink platform of MATLAB and stability is assessed under different contingencies. The results show that, rotor swings of FFTS are compatible with conventional 50 Hz system. Lastly, comparative analysis of design parameters of FFTS and conventional transformer is presented. Synthesis approach is used for evaluation of design parameters. The results show that, FFTS transformer is costlier. Thus it is concluded that, FFTS is feasible and stable and there is no essential difficulty for practicing it in engineering.