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Almost all existing relevant literatures are focused on the multi-inverter system that only contains one type of inverter. Till now, the interactions in multi-inverter system consisting of polytype inverters have been not investigated systematically. To fill this gap, the paper is aimed at the stability study of the generic system containing multiple types of inverters. The mathematic model of interactions...
Harmonic resonances around the intersection frequency is triggered with the stability margin decreasing to zero and the system will be unstable with the stability margin reducing to be negative. For suppressing harmonics, the phase difference between the inverter admittance and grid admittance should be lower than 120° at their intersection. Based on this principle, a phase-reshaping strategy aiming...
In the paper a simple stability-equivalent single- inverter system is proposed to analyze the stability of the complex multi-inverter system. Investigation shows that the harmonic resonance even instabilities will be triggered with the increase of the paralleled inverter quantities or the grid inductance due to the interaction between the inverter admittance and the grid admittance. From the perspective...
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