A Hybrid Damping Method for LCL-Filter Based Grid-Tied Inverter

Abstract:

Article Preview

With more and more distributed renewable energy connecting to the power system, inverters are widely used as the power electronic interface. However, high-order filters will inevitably bring in problems of resonance. Additionally, long-distance transmission and quantities of inverters increase the grid impedance obviously. Wide variation of grid impedance will not only impact on the resonance of filters, but also challenge stability of inverters system. This paper investigates how resonance and stability of grid-tied inverter with LCL-filter will be affected by the grid impedance. And a hybrid damping method based on RC parallel damper and biquad digital filter is proposed, this method presents relatively low power losses, requires no extra sensors and control loops with its simple damping strategy design. Moreover, it apparently improves system stability and waveform quality of grid-side current when grid impedance varies in a comparatively large range. Both validity and feasibility of this algorithm are verified via simulations.

Info:

Periodical:

Edited by:

Rongqing Liang

Pages:

805-810

Citation:

L. Ma et al., "A Hybrid Damping Method for LCL-Filter Based Grid-Tied Inverter", Applied Mechanics and Materials, Vol. 734, pp. 805-810, 2015

Online since:

February 2015

Export:

Price:

$38.00

[1] LI Xiaoqiang, WU Xiaojie, GENG Yiwen, ZHANG Qi. Proceedings of the CSEE (2014), 34(18): 2906-2916, In Chinese.

[2] Jeong H G, Lee K B, Choi S, et al. Power Electronics, IEEE Transactions on, (2010), 25(5): 1320-1330.

[3] Zhang C, Dragicevic T, Vasquez J C, et al. EnergyCON. (2014 • May13-16).

[4] Wu W, He Y, Tang T, et al. Industrial Electronics, IEEE Transactions on, (2013), 60(10).

[5] Twining E, Holmes D G. Power Electronics, IEEE Transactions on, (2003), 18(3): 888-895.

[6] Lu X, Huang K S L, Blaabjerg M L F: An active damping method based on biquad digital filter for parallel grid-interfacing inverters with LCL filters[C]/Applied Power Electronics Conference and Exposition (APEC), 2014 Twenty-Ninth Annual IEEE. IEEE, (2014).

DOI: https://doi.org/10.1109/apec.2014.6803338

[7] Wu W, Lin Z, Sun Y, et al: A hybrid damping method for LLCL-filter based grid-tied inverter with a digital filter and an RC parallel passive damper[C]/Energy Conversion Congress and Exposition (ECCE), 2013 IEEE. IEEE, (2013): 456-463.

DOI: https://doi.org/10.1109/ecce.2013.6646737

[8] He J, Li Y W, Bosnjak D, et al. Power Electronics, IEEE Transactions on, (2013), 28(1): 234-246.

Fetching data from Crossref.
This may take some time to load.