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Accepted Papers 
Resonance Characteristics Analysis of
Gridconnected Inverter Systems based on
Sensitivity Theory
Jian Wu, Wanqin Han, Tao Chen, Jiaqi Zhao, Binbin Li, and Dianguo Xu 
Abstract 
Harmonic resonance exists in gridconnected inverter systems. In order to determine the network components that contribute to
harmonic resonance and the composition of the resonant circuit, sensitivity theory is applied to the resonance characteristic analysis.
Based on the modal analysis, the theory of sensitivity is applied to derive a formula for determining the sensitivities of each network
component parameter under a resonance circumstance that reflects the participation of the network component. The solving formula
is derived for both parallel harmonic resonance and series harmonic resonance. This formula is adopted to a 4node gridconnected
test system. The analysis results reveal that for a certain frequency, the participation of parallel resonance and series resonance are
not the same. Finally, experimental results demonstrate that the solving formula for sensitivity is feasible for gridconnected systems. 
Keyword 
Gridconnected system, Resonance sensitivity, Sensitivity analysis, Series harmonic resonance 
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