Harmonic oscillation source identification-based stability improving method: Application to grid-connected inverters multi-infeed system

Key Points

• This research aims to identify harmonic oscillation sources in grid-connected inverter systems and improve their stability.
• Constructed a current oscillation modal gain model for grid-connected inverter multi-infeed systems.
• Developed an equivalent source-load model to analyze harmonic oscillation sources.
• Analyzed system stability under varying grid impedances and proposed a method for stability improvement.
• Successfully identified key harmonic oscillation sources affecting system stability.
• Demonstrated that the proposed asymmetric impedance remodeling methods can effectively enhance stability.
• Showed improved performance in stability at different grid impedance configurations.