Nonlinear Dynamic Model of System with Grid-following Converter and Grid-forming Converter

Grid-following converter and grid-forming converter have great strategic significance in practical application or research analysis. However, the existing papers mainly analyze the system model based on the small-signal state space model. Based on the above considerations, a nonlinear dynamic model of the dual-machine system with grid-following converter and grid-forming converter is derived in this paper. This model has good theoretical value in analyzing the large disturbance stability of the system. Specifically, this paper first describes the equipment and components of the model in detail. Then, each part of the system is theoretically deduced, and finally the nonlinear dynamic equation of the system is obtained. Finally, the dynamic equations are verified by three cases. The experimental results indicate that the nonlinear dynamic equations derived in this paper can well represent the dynamic response of the system.