Abstract: Photovoltaic（PV） integration by a motor-generator pair（MGP） system changes the energy interaction node between it and the power grids, which greatly improves its capability of high/low voltage ride through. However, the power angle stability of synchronous motor is reintroduced. Based on the system structure and control strategy of PV integration by a MGP, the variation mechanism of two motors′ power angle in the process of generator voltage drops is analyzed theoretically in this paper. Aiming to control the active power output of PV in the process of low voltage ride through（LVRT）, a voltage-rotor speed feedback control loop is introduced into the original DC voltage feedback control strategy. Based on the electromagnetic transient simulation soft PSCAD/EMTDC, A single machine infinite bus simulation system is established to verify the variation mechanism of MGP, and a short circuit fault of transmission line under different duration is set, then the transient power angle stability under large disturbance between MGP and thermal power unit with same capacity and inertia is compared. The results show that the former is better because of the dual excitation effect. Finally, the simulation results show that the improved control strategy can enhance the transient power angle stability and the LVRT of the PV integration of a MGP.