18-03-2013, 06:05 PM
pOWER TRANSMISSION THROUGH FRACTIONAL
FREQUENCY SYSTEM
ABSTRACT
The fractional frequency transmission system FFTS is a very promising long -distance transmission approach, which uses lower frequency (50/3) to reduce the electrical length of the AC power line, and thus its transmission capacity can be increased several fold . This paper introduces the primary experiments results of FFTS.
The experiment uses the phase-controlled cycloconverter as the frequency changer, stepping up 50/3Hz electricity to 50Hz electricity and supplying it to the utility grid. Thus, a new flexible ac transmission system device is successfully established in this experiment. The synchronizing process of 50/3Hz transmission system with 50Hz utility system is introduced in this paper. The experiment results show that a 1200km/500kv transmission line can transmit more than 2000MW electric power when employing the FFTS. The experiment also illustrates that there is no essential difficulty to realize FFTS in engineering practice
