Active damping strategy with differential feedback of grid‑side inductor voltage for LCL‑filtered grid‑connected inverters

Mingming Li; Hua F. Xiao; Ming Cheng

Active damping strategy with differential feedback of grid‑side inductor voltage for LCL‑filtered grid‑connected inverters

Mingming Li

Hua F. Xiao

Ming Cheng

Vol. 22, No. 2, pp. 176-186, Feb. 2022

10.1007/s43236-021-00355-0

Grid-side inductor voltage

Differential feedback

Parasitic resistance

Control delays

Abstract

Active damping (AD) methods with extra feedback provide a high rejection of the resonance peak caused by LCL-filters, and have the advantages of simple implementation and strong robustness. Among them, capacitor current proportional-feedback AD has been proved to be effective and robust with only a proportional calculation. However, a large capacitive current pulsation restricts the detection accuracy. Based on a theoretical derivation, the same damping effect but with a better rejection of grid harmonic can be obtained by grid-side inductor voltage differential-feedback AD. However, the measured inductor voltage usually contains a parasitic resistance voltage that is difficult to separated, and it deteriorates the performance of LCL-filters. To solve this problem, a differential-negative proportional method based on the vector relationship between the voltages of the grid-side inductor and its parasitic resistance is proposed in this paper. In addition, the influence of control delays is considered and a solution is given. Experimental results based on a 3 kW LCL-type grid-connected inverter prototype are provided to verify the effectiveness of the proposed method.

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Cite this article

[IEEE Style]

M. Li, H. F. Xiao, M. Cheng, "Active damping strategy with differential feedback of grid‑side inductor voltage for LCL‑filtered grid‑connected inverters," Journal of Power Electronics, vol. 22, no. 2, pp. 176-186, 2022. DOI: 10.1007/s43236-021-00355-0.

[ACM Style]

Mingming Li, Hua F. Xiao, and Ming Cheng. 2022. Active damping strategy with differential feedback of grid‑side inductor voltage for LCL‑filtered grid‑connected inverters. Journal of Power Electronics, 22, 2, (2022), 176-186. DOI: 10.1007/s43236-021-00355-0.