Abstract
With increasing penetration of intermittent renewable energy sources into the electric grid, conventional thermal power plants are being forced to cycle their load and operate under low-load conditions much more frequently. A high-fidelity dynamic model of a natural gas combined cycle (NGCC) power plant with rigorous equipment level sub-models is developed in this work. A model of the gas turbine (GT) for estimating its performance under off-design conditions, a thermo-hydraulic model for the heat recovery steam generator (HRSG), and a model of the steam turbine (ST) with moisture detection and model adaptation capability are also developed. Five novel configurations are proposed for controlling the main steam and reheat steam temperatures while avoiding ‘spraying to saturation’ during fast load-following by considering final high-pressure superheater (HP SH2)/ reheater (RH) arrangement (in series or in parallel) and attemperation strategies (single-stage, two-stage, and damper-assisted attemperation). Lo...
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