针对目前电网建设面临的部分线路输电能力受限同时伴随高比例电力电子设备的入网导致的“电网惯性不足”问题，提出了一种能够实现有功潮流控制及无功补偿，并能为电网提供惯性支撑的电机-发电机串联变压器（MGST）新型潮流控制方法。利用同步电机组本身具备较大惯性的条件，在此基础上调整了其安装方式与电机的励磁控制策略，最后基于MATLAB/Simulink平台对该设备进行仿真分析并将结果与同一情景下的统一潮流控制器（UPFC）装置的仿真结果作对比，进而分析MGST装置的调节效果。仿真结果表明MGST装置具备潮流控制及稳定电压的能力，由于电机转子惯性较大导致响应速度略低于UPFC，但作为一种新型潮流控制装置目前能够达到预期的调节效果。

The limited transmission capacity of some lines occurs in power grid construction, with facing the problem of "insufficient grid inertia" caused by high proportion of power electronic equipment entering the power grid. In order to solve these problems, a novel motor-generator series transformer (MGST) power flow control method is proposed. The control method can not only realize active power flow control and reactive power compensation, but also provide inertia support for the power grid. Taking advantage of the condition that the synchronous motor unit itself has large inertia, its installation mode and the excitation control strategy of the motor are adjusted. Finally, the equipment is simulated and analyzed based on MATLAB/Simulink platform, and the results are compared with the simulation results of unified power flow controller (UPFC) device under the same situation. So, the adjustment effect of MGST device is analyzed. The simulation results show that the MGST device has the ability of controlling power flow and keeping voltage stable. However, due to the large inertia of motor rotor, the response speed is slightly lower than that of UPFC. As a novel power flow controller, the MGST device can achieve the expected adjustment effect at present.