In this study several cycles are examined: the combined cycle with topping cycle: simple gas turbine,
two shaft gas turbine, intercooler gas turbine and regenerative gas turbine. The simulated modeling results
show that the influence of the ambient temperature and compression ratio are significantly effect on
performance of combined cycle gas turbine power plant for different gas turbine configuration. The
results are summarized as follows:
1. The ambient temperature and compression ratios are strongly influence on the overall thermal
efficiency of the combined cycle gas turbine power plant for different gas turbine configuration.
2. Higher overall thermal efficiency for combined cycle gas turbine with regenerative gas turbine
configuration. Efficiency quoted range about 64.5% with low compression ratio.
3. The overall thermal efficiency of combined cycle decreases and total power output increases linearly
with increase of ambient temperature for all gas turbine configurations except the regenerative gas
turbine the total power output decreases.