Megawatt-level converter grid-forming control technology by adopting MPC for medium voltage distribution network

The grid-forming control (GFM) is treated as controlled voltage sources, which can enhance synchronize stability in weak grid case. However, the dynamic response of existing GFM method is limited, and the transient overcurrent in fault is still not solved well, which limits its wide application in distribution network. Drawing from a DC transformation project in an electroplating industrial park in China, this paper proposes an improved GFM control strategy for medium-voltage megawatt converters. The proposal includes the following: firstly, this paper presents an overview of GFM/GFL converters control method; secondly, the establishment of a mathematical model for MMC converters; thirdly, the development of a new MMC grid-forming control technology based on model predictive control, for achieving improved current limitation, dynamic response, and power quality, finally, the verification of these concepts through simulations. This paper provides new insights and strategies for Megawatt-level converter, and reducing carbon emissions in DC industrial parks.