Configuration Analysis of Grid-forming Converter Under 100% Renewable Electricity Systems

With the application of high proportion of renewable energy and power electronic equipment in the modern power system, power electronic equipment represented by converters based on grid-forming (GFM) strategy and grid-following (GFL) strategy are penetrating sharply in power system, which has been profoundly changing the dynamic behavior of the power system. Therefore, this paper compares the basic principles and control methods of converters based on grid-forming strategy and grid-following strategy, establishes the small-signal model and the detailed time-domain model, and then proposes a proportional configuration method for the grid-forming converter in 100% renewable electricity systems. Finally, through the small-signal model, the influence of different proportions of grid-forming converters on the stability of 100% renewable electricity system is discussed, and the correctness of the proportional configuration of grid-forming converters proposed in this paper and the feasibility of independent operation of 100% new energy independent system is verified.