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The use of renewable energy sources (REs) such as solar and wind power is necessary to reduce the global CO2 emissions. However, the fluctuating power output of REs renders the electric grid unstable, and thus, a realistic approach must be established to compensate for the load fluctuations associated with RE-based power generation. Gas turbine combined cycle power generation (GTCC) with a rapid start-up and high ramp rate is a potential solution to develop REbased power generation. Therefore, in this work, the conceptual design feasibility of such a system was examined in terms of both the thermal efficiency and operational characteristics. The development goals were as follows: a hot start-up time of approximately 10 min, load following rate of approximately 20%/min, and thermal efficiency equal to or higher than that of the existing GTCCs. To attain these goals, first, the performance was analyzed to determine the optimal system configuration in terms of the thermal efficiency. Subsequently, a dynamic model was constructed using the Modelica-based tool developed by CRIEPI to demonstrate the operational potential of the proposed GTCC in the context of flexible startup operation. INTRODUCTION On the basis of the Paris Agreement of 2016, several countries agreed upon greenhouse gas emission reduction targets and to adopt measures to achieve them. In Japan, a national policy has been implemented to enable widespread use of renewable energy sources, such as solar and wind power, to considerably increase the contribution of renewable energy in the energy mix by 2030 and significantly reduce the amount of CO2 emissions by 2050 (METI, 2018; Government of Japan, 2019). The goal is to reduce, by 2050, the amount of greenhouse gases by 80% compared to the level in FY2013. In particular, in the Fifth Strategic Energy Plan passed by the Japanese Cabinet in July 2018, renewable energy was defined as the main power supply, and a plan was outlined to increase its contribution to Japan’s energy mix from 22% to 24% by 2030. However, renewable energy sources are fundamentally unstable power sources whose output is considerably affected by the weather conditions, and it is necessary to establish countermeasures against load fluctuations to ensure the stable operation of the power systems. At present, pumped-storage power generation and thermal power generation with a high flexibility are used to overcome the aforementioned limitations; however, further countermeasures against load fluctuations are required in preparation for the mass introduction of renewable power sources. To this end, researchers are attempting to improve the technologies to predict the output of renewable energy sources and develop power storage technologies such as storage batteries. However, several issues still remain; for instance, the accuracy of prediction of the output must be improved, cost of development of power storage technologies must be reduced, the loss in power charging and

Performance Analysis and Dynamic Simulation of Large-Scale Gas Turbine Combined Cycle Power System with Rapid Start-up and High Ramp Rate