Thermal Power and Energy Storage Flexible Adjustment Demand Calculation Method in High Proportion Renewable Energy System

Tapping the flexible and potential adjustment ability of thermal power + energy storage to adapt to the fluctuation and intermittency of renewable energy has become a necessary condition for the security operation of power systems. In this paper, the increased installed capacity of the thermal power units that do not satisfy the power and electricity balance constraints is solved firstly based on typical load days. Combined with the typical load daily guaranteed power supply requirements on energy storage configuration and system required generation, system power and electricity balance scenarios are analyzed when energy storage is configured and not configured. Next, the installed capacity of the thermal power units that need to be increased when energy storage is not configured is obtained through calculation. And the energy storage configuration capacity is also calculated when it is configured. Then, the capacity benefit index of supporting power supply and the capacity replacement benefit index of supporting power supply is proposed to analyze the capacity utilization efficiency of thermal power units and the utilization efficiency of thermal power units replaced by energy storage. Finally, a provincial power grid is used to verify the effectiveness and adaptability of the proposed method.