Control Design of Grid Forming STATCOM for Grid with HVDC Receiving Side

STATCOM has been used in power systems to provide dynamic reactive power compensation and stabilize grid voltage. However, the conventional control strategy of STATCOM has shortcomings such as slow current response speed and stable problems in weak grids. Aiming at the application scenario of the grid with the HVDC receiving side, this paper proposes an improved STATCOM control method based on the grid forming control, and proposes a control mode switching strategy to limit the short-circuit current according to the fault depth of the power grid. The proposed method can provide almost instantaneous reactive current output capacity and maintain transient voltage stability, which will provide support for improving the operation stability of the grid with the HVDC receiving side.