An Improved Active Damping Method with Capacitor Current Feedback

Yi-Wen Geng; Ya-Wen Qi; Hai-Wei Liu; Fei Guo; Peng-Fei Zheng; Yong-Gang Li; Wen-Ming Dong

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자료유형: 학술저널

저자정보: Yi-Wen Geng (China University of Mining and Technology) Ya-Wen Qi (China University of Mining and Technology) Hai-Wei Liu (China University of Mining and Technology) Fei Guo (China University of Mining and Technology) Peng-Fei Zheng (China University of Mining and Technology) Yong-Gang Li (China University of Mining and Technology) Wen-Ming Dong (China University of Mining and Technology)

저널정보: 전력전자학회 JOURNAL OF POWER ELECTRONICS JOURNAL OF POWER ELECTRONICS Vol.18 No.2

발행연도: 2018.3

수록면: 511 - 521 (11page)

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Proportional capacitor current feedback active damping (CCFAD) has a limited valid damping region in the discrete time domain as (0, fs/6). However, the resonance frequency (fr) of an LCL-type filter is usually designed to be less than half the sampling frequency (fs) with the symmetry regular sampling method. Therefore, (fs/6, fs/2) becomes an invalid damping region. This paper proposes an improved CCFAD method to extend the valid damping region from (0, fs/6) to (0, fs/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, fs/2). The performances at the steady and dynamic state are enhanced by the selected feedback coefficient H and controller gain Kp. Finally, the feasibility and effectiveness of the proposed CCFAD method are verified by simulation and experimental results.

#Active damping #Capacitor current feedback #Damping region #LCL filter

참고문헌 (25)

참고문헌 신청

H. R. Karshenas and H. Saghafi, “Basic criteria in designing LCL filters for grid connected converters,” in 2006 IEEE International Symposium on Industrial Electronics, pp. 1996-2000, 2006. L. A. Serpa, S. Ponnaluri, P. M. Barbosa, and J. W. Kolar, “A modified direct power control strategy allowing the connection of three-phase inverter to the grid through LCL filters,” IEEE Trans. Ind. Appl., Vol. 43, No. 5, pp. 1388- 1400, Sept. 2007. W. Sun, X. Wu, P. Dai, and J. Zhou, “An over view of damping methods for three-phase PWM rectifier,” in 2008 IEEE International Conference on Industrial Technology, pp. 1-5, 2008. T. C. Y. Wang, Z. Ye, G. Sinha, and X. Yuan, “Output filter design for a grid-interconnected three-phase inverter,” in Proc. 34th IEEE Power Electron. Spec. Conf., pp. 779- 784, 2003. W. Yin, and Y. Ma, “Research on three-phase PV grid-connected inverter based on LCL filter,” in Proc. 8th IEEE Conf. Ind. Electron. Appl., pp. 1279-1283, 2013.

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