Work

SISO admittance reshaping and enhanced robustness of single-phase grid-connected inverter based on frequency-decoupling in weak grid

Year: 2025

Type: article

Abstract: Asymmetric control often introduces frequency coupling in single-phase phase-locked loop (PLL) under weak grid condition, which deteriorates the stability for the gridconnected system. In this paper, in order to address the infinite characteristics of frequency coupling in the single-phase system, an admittance model based on harmonic transfer function matrix is established. Then, by designing a decoupling factor in the current loop of the inverter, a reduced-order single-input singleoutput (SISO) admittance model is established. Furthermore, based on the improved model, an effective admittance shaping method is proposed to realize the passivity of output admittance, which ensures the stable operation of grid-connected inverter under weak grid condition. Finally, experimental results validate the effectiveness of the proposed method in suppressing frequency coupling and stability enhancement.

Source: International Journal of Electrical Power & Energy Systems

DOI: 10.1016/j.ijepes.2025.111197

Authors: Xiangyu Li, Xiangou Zhu, Qihang Sun, Yuxing Dai, Jiajie Xie, Jiabao Kou

Institution: Wenzhou University

Language: English

Topic: Microgrid Control and Optimization

Subfield: Control and Systems Engineering

Field: Engineering

Domain: Physical Sciences

SDGs: Industry, innovation and infrastructure, Affordable and clean energy

Open Access status: gold

Estimated APC paid: $3,920