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

Ling Yang, Yandong Chen, An Luo and Kunshan Huai
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Ling Yang: School of Automation, Guangdong University of Technology, Guangzhou 510006, China
Yandong Chen: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
An Luo: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Kunshan Huai: Guangzhou Power Supply Co., Ltd., Guangzhou 510620, China

Energies, 2019, vol. 12, issue 13, 1-18

Abstract: 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.

Keywords: distributed generation; weak grid; inverter; impedance coupling; admittance reshaping (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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