Analysis of The Impact of Non Ideal Grid Conditions on The Pre-Synchronization Strategy of Microgrids

Pre-synchronization is a key step in the transition of microgrids from off grid to grid connected mode, and its synchronization stability and anti-interference ability are important guarantees for the integration of distributed new energy into the grid. Propose a pre-synchronization strategy similar to reactive power calculation in αβ coordinate system, and explain its control principle. By establishing a nonlinear dynamic model to analyze its mathematical essence, and thereby analyzing the impact mechanism on its control when the power grid voltage contains asymmetry, low order harmonics, and DC component interference. Finally, the correctness of the analysis was verified through MATLAB/Simulink simulation and experiment.