Resonance Suppression Method of the Interactive Current Based on Impedance Reshaping

This study discusses the problem of resonance suppression for multi-inverter systems with different parameters. The complex coupling of the system can lead to different types of resonance, resulting in a decrease in stability. Existing impedance reshaping methods are mostly for improving the input-grid current quality, neglecting other types of resonances. In the paper, a new energy cluster system model is established to analyze the resonance coupling relationship and to obtain the objective of system impedance reshaping. The parallel impedance is optimally designed to produce a suppression effect on different types of system resonance. Finally, the correctness of the related conclusions is verified by simulation results.