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Open AccessArticle

Admittance Reshaping Control Methods to Mitigate the Interactions between Inverters and Grid

1
School of Automation, Guangdong University of Technology, Guangzhou 510006, China
2
College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
3
Guangzhou Power Supply Co., Ltd., Guangzhou 510620, China
*
Author to whom correspondence should be addressed.
Energies 2019, 12(13), 2457; https://doi.org/10.3390/en12132457
Received: 20 May 2019 / Revised: 17 June 2019 / Accepted: 19 June 2019 / Published: 26 June 2019
(This article belongs to the Special Issue Power Electronics and Power Quality 2019)
With the increasing impedance coupling between inverters and grid caused by the phase-locked loop (PLL), traditional three-phase inverters suffer from the harmonic distortion or instability problems under weak grid conditions. Therefore, the admittance reshaping control methods are proposed to mitigate the interactions between inverters and grid. Firstly, a dynamics model of traditional inverter output admittance including main circuit and PLL is developed in the direct-quadrature (dq) frame. And the qq channel impedance of the inverter presents as a negative incremental resistance with the PLL effect. Secondly, two admittance reshaping control methods are proposed to improve the system damping. The first reshaping technique uses the feedforward point of common coupling (PCC) voltage to modify the inverter output admittance. The second reshaping technique adopts the active damping controller to reconstruct the PLL equivalent admittance. The proposed control methods not only increase the system phase margin, but also ensure the system dynamic response speed. And the total harmonic distortion of steady-state grid-connected current is reduced to less than 2%. Furthermore, a specific design method of control parameters is depicted. Finally, experimental results are provided to prove the validity of the proposed control methods. View Full-Text
Keywords: distributed generation; weak grid; inverter; impedance coupling; admittance reshaping distributed generation; weak grid; inverter; impedance coupling; admittance reshaping
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MDPI and ACS Style

Yang, L.; Chen, Y.; Luo, A.; Huai, K. Admittance Reshaping Control Methods to Mitigate the Interactions between Inverters and Grid. Energies 2019, 12, 2457. https://doi.org/10.3390/en12132457

AMA Style

Yang L, Chen Y, Luo A, Huai K. Admittance Reshaping Control Methods to Mitigate the Interactions between Inverters and Grid. Energies. 2019; 12(13):2457. https://doi.org/10.3390/en12132457

Chicago/Turabian Style

Yang, Ling; Chen, Yandong; Luo, An; Huai, Kunshan. 2019. "Admittance Reshaping Control Methods to Mitigate the Interactions between Inverters and Grid" Energies 12, no. 13: 2457. https://doi.org/10.3390/en12132457

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