FREE GOVERNOR MODE
The developing countries have sustained power shortage
problems compared to developed countries for many reasons,
mostly financial in nature. The developed countries have to
address the power deficient areas occasionally. The deficient
systems have typical features like frequency deviations, abrupt
arising of deficiencies of power, low voltages and lack of
coordination among constituents under a region due to
indiscipline actions. In India speed governors have been
prevented from responding by the utilities, with dead band
configuring from 47.5 Hz to 51.5 Hz. Emergency unloading of
a unit is available only when frequency reaches 51.5 Hz. As a
consequence excursions in frequency are common up to 1 Hz
in a time block of 15 minutes. For the sake of better control
efforts are being made to enable the frequency governors to
respond to entire range of frequency. ****This is called free
governor mode of operation (FGMO).