An Active Damping Scheme Based on a Second Order Resonant Integrator for LCL-Type Grid-Connected Converters

Chen Chen; Jian Xiong; Kai Zhang

An Active Damping Scheme Based on a Second Order Resonant Integrator for LCL-Type Grid-Connected Converters

Chen Chen

Jian Xiong

Kai Zhang

Vol. 17, No. 4, pp. 1058-1070, Jul. 2017

10.6113/JPE.2019.17.4.1058

Grid-connected converter

LCL filter

Model reference adaptive control

Resonance damping

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Abstract

This paper proposes a novel active damping scheme to suppress LCL-filter resonance with only grid-current feedback control in grid-connected voltage-source converters. The idea comes from the concept of the model reference adaptive control (MRAC). A detailed theoretical derivation is given, and the effectiveness of this method is explained based on its physical nature. According to the control structure of this method, the active damping compensator, which is essentially a second order resonant integrator (SORI) filter, provides an effective solution to damp LCL resonance and to eliminate the need for additional sensors. Compared with extra feedback methods, the cost and complexity are reduced. A straightforward tuning procedure for the active damping method has been presented. A stability analysis is illustrated in the discrete domain while considering a one-step delay. Finally, experimental results are presented to validate the analysis and to demonstrate the good performance of the proposed method.

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Cite this article

[IEEE Style]

C. Chen, J. Xiong, K. Zhang, "An Active Damping Scheme Based on a Second Order Resonant Integrator for LCL-Type Grid-Connected Converters," Journal of Power Electronics, vol. 17, no. 4, pp. 1058-1070, 2017. DOI: 10.6113/JPE.2019.17.4.1058.

[ACM Style]

Chen Chen, Jian Xiong, and Kai Zhang. 2017. An Active Damping Scheme Based on a Second Order Resonant Integrator for LCL-Type Grid-Connected Converters. Journal of Power Electronics, 17, 4, (2017), 1058-1070. DOI: 10.6113/JPE.2019.17.4.1058.