Enhanced robustness with damping interval widening strategy
of LCL‑type converter under weak grid condition

Qi Wang; Wenping Qin; Lei Wang; Xiaoqing Han; Peng Wang

Enhanced robustness with damping interval widening strategy of LCL‑type converter under weak grid condition

Vol. 20, No. 2, pp. 410-427, Mar. 2020

10.1007/s43236-020-00033-7

Abstract

Active damping methods are widely adopted to present a damping effect on the resonance phenomenon without the power loss of LCL-type converters connected to a grid. However, extra sensors are used to implement the damping strategy. In this paper, a sensorless damping strategy where only the grid current is sampled has been proposed. Furthermore, the inner relationship between the tradition capacitor current feedback strategy and the proposed strategy has been clarified. Considering the digital delay and a weak grid, a robust method that uses unit delay feedback to mitigate the phase lag and to widen the effective damping interval has been developed. With this simple measure, stability is enhanced during the Nyquist frequency and robustness is improved when the LCL parameters vary and grid impedance exists. Finally, simulation and experimental results are presented to verify the feasibility and engineering significance of the proposed strategy.

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Cite this article

[IEEE Style]

Q. Wang, W. Qin, L. Wang, X. Han, P. Wang, "Enhanced robustness with damping interval widening strategy of LCL‑type converter under weak grid condition," Journal of Power Electronics, vol. 20, no. 2, pp. 410-427, 2020. DOI: 10.1007/s43236-020-00033-7.

[ACM Style]

Qi Wang, Wenping Qin, Lei Wang, Xiaoqing Han, and Peng Wang. 2020. Enhanced robustness with damping interval widening strategy of LCL‑type converter under weak grid condition. Journal of Power Electronics, 20, 2, (2020), 410-427. DOI: 10.1007/s43236-020-00033-7.