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Resonance Characteristics Analysis of Grid-connected Inverter Systems based on Sensitivity Theory
Jian Wu, Wanqin Han, Tao Chen, Jiaqi Zhao, Binbin Li, and Dianguo Xu
Abstract Harmonic resonance exists in grid-connected 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 4-node grid-connected 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 grid-connected systems.
Keyword Grid-connected system, Resonance sensitivity, Sensitivity analysis, Series harmonic resonance
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