Impact of Control Strategies on the Off- Design Operation of the Gas Turbine in a Combined Cycle Gas Turbine (ccgt) Power Plant
نویسنده
چکیده
The off-design performance of a combined cycle gas turbine (CCGT) plant for power generation is of great importance. In this work, a detailed mathematical model is developed for a triple-pressure reheat combined cycle power plant. Using the model, CCGT off-design operation and efficiency are studied under four gas turbine (GT) strategies. Controlling the turbine inlet temperature (TIT) gives better GT performance, but reduces the turbine exhaust temperature (TET) and the combined cycle efficiency. On the other hand, controlling the variable guide vanes (VGVs) along with TIT gives higher combined cycle efficiency for GT loads between 60% and 100%. Below 60% load, controlling the VGVs and TET outperforms the other operating strategies in combined cycle efficiency. Hence, a mixed operating strategy seems the best for improving the CCGT off-design performance.
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