Title :
Output impedance modeling of grid-connected inverters considering nonlinear effects
Author :
Xu, Dezhi ; Wang, Fei ; Ruan, Yi ; Mao, Hualong
Author_Institution :
Dept. of Mechatron. Eng. & Autom., Shanghai Univ., Shanghai, China
Abstract :
Accurate modeling of a single-phase grid-connected inverter with LCL filter considering the dead-time effects and nonlinear characteristics of switching devices is addressed in this paper. By comparing with the conventional averaged model and switching model, the equivalence of the derived model is verified. Further, an output impedance model of the grid-connected inverter is proposed and applied to the analysis of grid harmonic interactions. It is shown such a model can be used to identify the root cause of harmonic generation of grid-connected inverter systems. Theoretical analysis and simulation results are presented to demonstrate the effectiveness of the proposed output impedance modeling.
Keywords :
filters; invertors; nonlinear control systems; power grids; LCL filter; dead-time effects; grid harmonic interactions; grid-connected inverters; impedance modeling; nonlinear characteristics; nonlinear control strategy; nonlinear effects; output impedance modeling; switching devices; theoretical analysis; Impedance; Integrated circuit modeling; Inverters; Pulse width modulation; Switches; Switching frequency; dead-time effects; grid-connected inverter; harmonic interactions; output impedance;
Conference_Titel :
Control and Modeling for Power Electronics (COMPEL), 2012 IEEE 13th Workshop on
Conference_Location :
Kyoto
Print_ISBN :
978-1-4244-9372-2
Electronic_ISBN :
1093-5142
DOI :
10.1109/COMPEL.2012.6251737
