Impedance Matching Based Control for the Resonance Damping of Microgrids with Multiple Grid Connected Converters

Shulong Tan; Hua Geng; Geng Yang

Impedance Matching Based Control for the Resonance Damping of Microgrids with Multiple Grid Connected Converters

Shulong Tan

Hua Geng

Geng Yang

Vol. 16, No. 6, pp. 2338-2349, Nov. 2016

10.6113/JPE.2016.16.6.2338

Grid-connected-converters

Impedance matching

LCL filter

Resonance damping

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Abstract

This paper presents an impedance-matching-based control scheme for the harmonic resonance damping of multiple grid-connected-converters (GCCs) with LCL filters. As indicated in this paper, harmonic resonance occurs if a GCC possesses an output impedance that is not matched with the rest of the network in some specific frequency bands. It is also revealed that the resonance frequency is associated with the number of GCCs, the grid impedance and even the capacitive loads. By controlling the grid-side current instead of the converter-side current, the critical LCL filter is restricted as an internal component. Thus, the closed-loop output impedance of the GCC within the filter can be configured. The proposed scheme actively regulates the output impedance of the GCC to match the impedance of the external network, based on the detected resonance frequency. As a result, the resonance risk of multiple GCCs can be avoided, which is beneficial for the plug-and-play property of the GCCs in microgrids. Simulation and experimental results validate the effectiveness of the proposed method.

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Cite this article

[IEEE Style]

S. Tan, H. Geng, G. Yang, "Impedance Matching Based Control for the Resonance Damping of Microgrids with Multiple Grid Connected Converters," Journal of Power Electronics, vol. 16, no. 6, pp. 2338-2349, 2016. DOI: 10.6113/JPE.2016.16.6.2338.

[ACM Style]

Shulong Tan, Hua Geng, and Geng Yang. 2016. Impedance Matching Based Control for the Resonance Damping of Microgrids with Multiple Grid Connected Converters. Journal of Power Electronics, 16, 6, (2016), 2338-2349. DOI: 10.6113/JPE.2016.16.6.2338.