In order to enhance the ability of the pumped storage unit to participate in the fault recovery under high-power loss

a multi-stage active power control method of pumped storage unit is proposed. Firstly

a mathematical model for pumped storage unit participating in active power control is developed based on the operational characteristics. Secondly

in order to meet the control requirements of the section and frequency under high-power loss

a multi-stage active power control method of pumped storage unit considering the safe operation constraints of the units is proposed. Finally

based on the practical operation strategies of the provincial ultra high voltage (UHV) receiving-end power grid

the effectiveness of the proposed method is verified.