Coupling resonance characteristics of multiple grid-connected inverters
ZHU Xiao-hui
YUAN Yu-xia
ZHANG Qing-hui
Abstract：In order to solve the complex coupled resonance problem for the parallel grid-connected system of grid-connected inverters with multiple LCL filters, the mathematical model for single inverter was established, which was extended to form the mathematical model for the multiple inverter parallel system.With considering the equivalent circuit model when the inverter itself, parallel inverter and grid separately functioned, a small signal equivalent simplified circuit of multiple inverter parallel system based on the superposition theorem was proposed.With the frequency domain analysis method, the coupling resonance characteristics of multi inverters in parallel were analyzed, which were compared with the resonance characteristics of single inverter.The results show that an additional resonance peak will occur in the multiple inverter parallel system, and the resonance peak value and frequency are related to the number of parallel inverters.
Keywords：LCL filteringparallel connectioncouplingresonancemathematical modelsuperposition theoremfrequency domain analysis
Publication Date：2017-05-02
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 248-252 )