Reserve-Constrained Unit Commitment Considering Adjustable-Speed Pumped-Storage Hydropower and Its Economic Effect in Korean Power System

The Korean government has declared the goal of net-zero-carbon emissions with a focus on renewable energy expansion. However, high proportion baseload generators and an increasing variable (VRE) may cause problems in power system operation owing to low cycling capability variability VRE. To maintain reliability, is planning construct pumped-storage hydropower (PSH) plants, which can provide flexibility system. This study evaluated operating cost savings obtained by different types PSH: adjustable-speed PSH (AS-PSH) fixed-speed (FS-PSH), based duck-curve phenomenon increase spinning reserve requirement. In this study, reserve-constrained unit commitment was formulated using mixed-integer-programming considering operational characteristics AS-PSH conventional generators. consider duck-shaped net-load environment, projected VRE output data were calculated through physical models wind turbines photovoltaic modules. costs for non-PSH, FS-PSH, construction scenarios KRW 43,129.38, 40,038.44, 34,030.46, respectively. main factor that derived difference determined be primary AS-PSH’s pumping mode.