In order to improve energy utilization efficiency of signal-phase distributed generation (DG), two novel single-phase DG grid-connected control methods are proposed based on adaptive notch filter (ANF) and they are applied in different conditions. The P control system takes active power control as the core, and the PQ control system takes active power and reactive power control as the core. The photovoltaic source can output the maximum power when it is connected with the grid, and the battery source outputs required power by using the proposed methods. In some cases, the DGs can provide reactive power compensation to some extent if the proposed method is employed. Since the ANF has a good performance on signal detection, compared with the traditional grid control system, the two methods have simple structures and offer a high degree of immunity and insensitivity to the grid disturbance. Finally, the rapidity and accuracy of the proposed methods are verified by simulation.