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Title: Phase reshaping via all-pass filters for robust LCL-filter active damping
Authors: Yao, Wenli
Yang, Yongheng
Xu, Yan
Blaabjerg, Frede
Liu, Shuyong
Wilson, Gary
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2019
Source: Yao, W., Yang, Y., Xu, Y., Blaabjerg, F., Liu, S. & Wilson, G. (2019). Phase reshaping via all-pass filters for robust LCL-filter active damping. IEEE Transactions On Power Electronics, 35(3), 3114-3126.
Journal: IEEE Transactions on Power Electronics
Abstract: Active damping is a common way to stabilize the current control of LCL-filtered converters. In this paper, the stable region of-180° phase crossing is first identified within a predefined range of grid impedance and LCL parameter variations. Once the phase of the current control loop is in the identified region, a stabilization control can be attained. Subsequently, digital filters can be adopted to achieve active damping by reshaping the open-loop phase. Various digital filters are selected and benchmarked in this paper. It is confirmed that the all-pass filter has a unity gain and adjustable lagging phase before the Nyquist frequency, thereby being a promising solution to the phase reshaping. Therefore, the all-pass filter is employed to move the phase of the open-loop control (i.e.,-180° phase crossing) into the targeted region for active damping. Notably, the current controller and the all-pass filter-based active damping can be separately designed, indicating the easy implementation of the active damping. Experimental tests demonstrate that the proposed method can ensure the system stability over a wide range of parameter variations (e.g., grid impedance changes and LCL-filter parameter drifts) while maintaining fast dynamics with the grid-side current control.
ISSN: 0885-8993
DOI: 10.1109/TPEL.2019.2927272
Schools: School of Electrical and Electronic Engineering 
Research Centres: Rolls-Royce@NTU Corporate Lab 
Rights: © 2019 IEEE. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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