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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 resonance involving grid-parallel inverters is becoming a critical issue in power systems with increasing amount of renewable energy and other distributed generation (DG) resources. Such harmonic resonance can occur at the grid interconnect point of individual or multiple grid-parallel solar or wind inverters, and is usually the result of impedance mismatch between the grid and the inverters...
Grid connected inverter can attenuate high frequency harmonics effectively through an LCL filter which has potential benefits for the inverter to get higher harmonic performance with lower switching frequency and less inductance in contrast with L filter. However, LCL filter is a third order system without damping and easy to resonate. In order to eliminate resonance and improve the system stability,...
This paper presents a study of renewable energy system stability based on impedance models of the sources and the grid. The focus is grid-parallel inverters controlled in the current injection mode. System stability analysis based on source output impedance and load input impedance is generalized to current-source systems. Output impedance modeling of current-controlled PWM inverters for grid interface...
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