Harmonic Resonance Analysis and Impedance Remodeling Method of Multi-Inverter Grid-Connected System

Abstract

The harmonic and resonant characteristics of a multi-inverter grid-connected system can negatively affect power quality when weak grid conditions are present. In this paper, firstly, harmonic currents are modeled for the inverter, the correctness of low-frequency harmonics and high-frequency harmonics are verified in closed loop, and the characteristics of harmonic currents are analyzed when the parameters are varied. Secondly, the resonant characteristics of the inverter with feed-forward link are analyzed, and a multi-inverter grid-connected equivalent model based on the triple-decomposition conductance is developed and analyzed in conjunction with the resonant modal analysis method. Then, a harmonic resonance impedance reshaping method is proposed to suppress the background harmonics using improved weighted average current control (WACC), suppress the system resonance based on the point of common coupling (PCC) paralleling virtual conductance method, and improve the stability margin of the system combined with impedance reshaping resonance suppression method. Finally, simulations and comparison of results with different suppression methods verify the superiority and effectiveness of the proposed method.

Research on the Control Method of the PV Grid-Connected Inverter under an Asymmetrical Power Grid Fault

“…For the resonance problem of the grid-connected inverter, the existing control methods include capacitor current feedback active damping control, capacitor voltage feedback active damping control, and grid current feedback active damping control, and these are widely discussed in the literature [2][3][4][5][6]. Using the impedance stabilization criterion in [7,8], the method is proposed to solve the adaptive control of gain scheduling for grid-connected inverter systems.…”