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http://dx.doi.org/10.6113/JPE.2018.18.1.185

Modal Analysis of Resonance and Stable Domain Calculation of Active Damping in Multi-inverter Grid-connected Systems  

Wu, Jian (School of Electrical Engineering and Automation, Harbin Institute of Technology)
Chen, Tao (School of Electrical Engineering and Automation, Harbin Institute of Technology)
Han, Wanqin (School of Electrical Engineering and Automation, Harbin Institute of Technology)
Zhao, Jiaqi (School of Electrical Engineering and Automation, Harbin Institute of Technology)
Li, Binbin (School of Electrical Engineering and Automation, Harbin Institute of Technology)
Xu, Dianguo (School of Electrical Engineering and Automation, Harbin Institute of Technology)
Publication Information
Journal of Power Electronics / v.18, no.1, 2018 , pp. 185-194 More about this Journal
Abstract
Interaction among multiple grid-connected inverters has a negative impact on the stable operations and power quality of a power grid. The interrelated influences of inverter inductor-capacitor-inductor filters constitute a high-order power network, and consequently, excite complex resonances at various frequencies. This study first establishes a micro-grid admittance matrix, in which inverters use deadbeat control. Multiple resonances can then be evaluated via modal analysis. For the active damping method applied to deadbeat control, the sampling frequency and the stable domain of the virtual damping ratio are also presented by analyzing system stability in the discrete domain. Simulation and experimental results confirm the efficiency of modal analysis and stable domain calculation in multi-inverter grid-connected systems.
Keywords
Active damping; Deadbeat control; Inductor-capacitor-inductor (LCL) filter; Modal analysis; Stability; Parallel inverters; Resonant;
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