Smooth switching control method for grid-following and grid-forming converters

Abstract In the end grid with high penetration of new energy, a single control mode of grid-following or grid-forming makes it difficult to balance stability, economy, and grid-supporting capabilities. To solve the above problems, starting from the topological structures and mathematical models of grid-following and grid-forming converters, this paper designs a smooth switching method for single-machine hybrid control. This method realizes the smooth switching of the phase angle and the reference values of d -axis and q -axis currents under the dual-mode switching. During the switching process, it suppresses the power and frequency fluctuations, improves the grid-connection stability, and enables the safe and stable operation of the converter under large-scale changes in grid strength. Finally, the feasibility of the proposed control method is verified through simulation experiments.