Our plant consists of two GE-9E machines,two HRSGs and one ST. The GE-9E machines each with rated load 117900 KW at 32°C, 80% RH and 1013 mbar (atm). The nominal frequency is 50Hz. For grid stability the transmission company now emphasize to run the plant on FGMO (Free Governor Mode of Operation). To optimize CCPP (combined cycle power plant) operations we generally set GT load 98 MW each and enable FGMO operation mode by clicking Raise/Lower button of SPEED/LOAD control @50.0HZ Grid Frequency.
However we observed abnormal load variations when grid frequency too much fluctuated (49.5 Hz to 51.4Hz). Sometimes at 50.12HZ load is around 85MW, and sometimes it is 93MW and at 51.0HZ grid frequency sometimes the load is 65MW and sometimes 75MW. The reference droop of our Gas Turbines are 10% each.
Is there any option to set a safe load set point for FGMO operation at 50.0Hz frequency which is nominal frequency in our case?
Need a fruitful explanation regarding the issue from the MVPs of this forum.
Regards,
Rokan Uddin
However we observed abnormal load variations when grid frequency too much fluctuated (49.5 Hz to 51.4Hz). Sometimes at 50.12HZ load is around 85MW, and sometimes it is 93MW and at 51.0HZ grid frequency sometimes the load is 65MW and sometimes 75MW. The reference droop of our Gas Turbines are 10% each.
Is there any option to set a safe load set point for FGMO operation at 50.0Hz frequency which is nominal frequency in our case?
Need a fruitful explanation regarding the issue from the MVPs of this forum.
Regards,
Rokan Uddin