Grid Interconnection via Fractional Frequency Transmission System

The fractional frequency transmission system (FFTS) is an emerging solution for long-distance transmission. It can effectively reduce the impedance of transmission lines through lower transmission frequency. With regard to the advantages of FFTS, this paper introduces the FFTS in system interconnections. Through the FFTS, the electrical length of tie lines between different areas can be significantly reduced. To study the dynamics of the FFTS, it is utilised to replace the conventional AC tie lines in the two-area system. The dynamic model of the two-area system with the FFTS is presented. Both eigenvalue analysis and time domain simulations are carried out to study the damping performance of the two-area system with the FFTS. In addition, the power flow control via the FFTS is also achieved in this paper.

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