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Impedance Reshaping Control Strategy for Improving Resonance Suppression Performance of a Series-Compensated Grid-Connected System

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  • Haining Wang

    (College of Electrical and Information Engineering, Hunan University, Changsha 410082, China)

  • Yandong Chen

    (College of Electrical and Information Engineering, Hunan University, Changsha 410082, China)

  • Wenhua Wu

    (College of Electrical and Information Engineering, Hunan University, Changsha 410082, China)

  • Shuhan Liao

    (College of Electrical and Information Engineering, Hunan University, Changsha 410082, China)

  • Zili Wang

    (College of Electrical and Information Engineering, Hunan University, Changsha 410082, China)

  • Gaoxiang Li

    (College of Electrical and Information Engineering, Hunan University, Changsha 410082, China)

  • Zhiwei Xie

    (College of Electrical and Information Engineering, Hunan University, Changsha 410082, China)

  • Jian Guo

    (College of Electrical and Information Engineering, Hunan University, Changsha 410082, China)

Abstract

In the series-compensated grid-connected system (SCGCS), there is an impedance interaction between the inverter impedance and the grid impedance that is prone to cause resonance in the SCGCS. In this paper, firstly, considering the effects of the phase-locked loop (PLL), current-loop, and frequency coupling, the broadband impedance model of the SCGCS is established. The stability of the SCGCS is analyzed by the impedance-based Nyquist stability criterion. It is found from the stability analysis that the impedance interaction between the inverter impedance and the grid impedance is the leading cause of the resonance. An impedance reshaping based resonance suppression method is proposed to suppress the resonance. The phase characteristics of the inverter equivalent output impedance are reshaped from the perspective of impedance. The phase margin at the intersection frequency of the inverter impedance and the grid impedance is improved. The proposed resonance suppression approach mainly consists of reshaping the current loop impedance and the novel phase-locked loop impedance. Finally, simulations and experiments are used to verify the feasibility of the resonance analysis and the effectiveness of the proposed control strategy.

Suggested Citation

  • Haining Wang & Yandong Chen & Wenhua Wu & Shuhan Liao & Zili Wang & Gaoxiang Li & Zhiwei Xie & Jian Guo, 2021. "Impedance Reshaping Control Strategy for Improving Resonance Suppression Performance of a Series-Compensated Grid-Connected System," Energies, MDPI, vol. 14(10), pages 1-15, May.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:10:p:2844-:d:555011
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    References listed on IDEAS

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    3. Cédric Clastres, 2011. "Smart grids : Another step towards competition, energy security and climate change objectives," Post-Print halshs-00617702, HAL.
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