The invention belongs to the technical field of renewable energy power generation and new energy power grid, and particularly relates to a control method for a new energy power system under an operation mode of a normal regulation domain. According to the method, for differences of generating unit regulation performance and characteristics of a daily load curve in various periods, control parameter calculation is started, a control command of a controllable unit is sent, a control strategy is started, for short-term control, a hydroelectric unit is adopted, in order to solve the problem of hydroelectric unit reversed delay, an active bias of the system needs to be reduced as much as possible, so after introducing a corrected parameter, real-time control of tracking load change is realized;for long-term control, in order to respond to a load real-time power bias, output conditions of a hydroelectric unit and thermal power unit are divided according to a change rate, the change rate iscalculated, for different conditions, a hydroelectric generating set and a thermal power generating unit are respectively called for frequency adjustment, in order to solve the problem of thermal power unit reversed delay, the active bias of the system needs to be reduced as much as possible, and the purpose of the method is achieved.