In this paper the off-design performance analysis of existing conventional gas turbine combined cycle power plant (GTCC) integrated with parabolic trough solar field characterized by two molten salt storage tanks with nominal thermal power of 70 MW is described. The GTCC is constituted by two identical sections whose nominal net power is 385 MW. Due to solar steam integration, the GTCC always operates in off-design conditions. In order to assess its performances, a detailed steady-state simulation model of the integrated power plant is defined. Two integration configurations are analysed. In the former, each power section is fed by half mass flow of the solar steam and each gas turbine (GT) operates at its nominal load. In the latter case, the solar steam is integrated into only one power section and the GT load is reduced so that the pressure levels in the heat recovery steam generator are not greater than the maximum allowable values. In both configurations, the net conversion efficiency of the thermal power collected by molten salts in the solar field results equal to about 43% and decreases when the solar steam mass flow rate increases.
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