Study on stability control of flexible DC transmission system based on VSG

At present, the construction and operation of the flexible DC transmission project has been launched, because the overall rotational inertia of the power grid is reduced, the traditional PQ control is difficult to support the system in voltage magnitude and frequency. For this reason, VSG technology is introduced into the flexible DC transmission system to increase the system’s stability and realize the friendly support to the grid. This paper analyzes the flexible DC transmission control technology based on a virtual synchronous motor, analyzes its control strategy and system stability, and conducts a test in the Yu-E project to compare the existing PQ control strategy technology. After the test, the results show that the VSG control strategy system meets the system requirements.