Algerian Journal of Electrical Systems and Sustainability
Volume 2, Numéro 1, Pages 45-51
2026-06-30
Design And Implementation Of A Single Grid-current Feedback Active Damping Strategy For Lcl-filtered Grid-connected Inverters
Authors : Abdoune Fateh .
Abstract
This paper investigates a design method for regulating the injected current of renewable energy systems connected to the power grid through single- or three-phase voltage source inverters equipped with LCL filters. Inspired by the structure of passive damping schemes, a virtual resistance concept based on single grid-current feedback is adopted to achieve active damping without requiring additional sensors, thereby reducing system cost. Closed-loop analysis reveals that the proposed control strategy is equivalent to a conventional dual-loop control with capacitor-current feedback. However, such equivalence can only be achieved through an accurate second derivative approximation. To address the noise sensitivity associated of the derivative operation connection of a pure second derivative and a second-order low-pass filter is proposed. A proportional-resonant controller is employed to track the AC reference current, and a straightforward design procedure for determining the active damping controller parameters is introduced. To evaluate the performance of the proposed control method, the system is experimentally tested on a laboratory setup under distorted grid voltage. The obtained results confirm the effectiveness of the selected active damping approach.
Keywords
LCL filter ; active damping ; derivative approximation ; resonant controller ; stability design
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