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http://dx.doi.org/10.6113/JPE.2018.18.2.511

An Improved Active Damping Method with Capacitor Current Feedback  

Geng, Yi-Wen (School of Electrical and Power Engineering, China University of Mining and Technology)
Qi, Ya-Wen (School of Electrical and Power Engineering, China University of Mining and Technology)
Liu, Hai-Wei (School of Electrical and Power Engineering, China University of Mining and Technology)
Guo, Fei (School of Electrical and Power Engineering, China University of Mining and Technology)
Zheng, Peng-Fei (School of Electrical and Power Engineering, China University of Mining and Technology)
Li, Yong-Gang (School of Electrical and Power Engineering, China University of Mining and Technology)
Dong, Wen-Ming (School of Electrical and Power Engineering, China University of Mining and Technology)
Publication Information
Journal of Power Electronics / v.18, no.2, 2018 , pp. 511-521 More about this Journal
Abstract
Proportional capacitor current feedback active damping (CCFAD) has a limited valid damping region in the discrete time domain as (0, $f_s/6$. However, the resonance frequency ($f_r$) of an LCL-type filter is usually designed to be less than half the sampling frequency ($f_s$) with the symmetry regular sampling method. Therefore, ($f_s/6$, $f_s/2$) becomes an invalid damping region. This paper proposes an improved CCFAD method to extend the valid damping region from (0, $f_s/6$ to (0, $f_s/2$), which covers all of the possible resonance frequencies in the design procedure. The full-valid damping region is obtained and the stability margin of the system is analyzed in the discrete time domain with the Nyquist criterion. Results show that the system can operate stably with the proposed CCFAD method when the resonance frequency is in the region (0, $f_s/2$). The performances at the steady and dynamic state are enhanced by the selected feedback coefficient H and controller gain $K_p$. Finally, the feasibility and effectiveness of the proposed CCFAD method are verified by simulation and experimental results.
Keywords
Active damping; Capacitor current feedback; Damping region; LCL filter;
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