Design and Structure Optimization of Additional Damping Controller Based on Voltage Feedback Channel for Three-Phase LCL Grid-Connected Inverter
Year: 2025
Type: book-chapter
Abstract: Aiming at the problem of low and medium frequency band suppression in the three-phase LCL inverter grid-connected power system, an additional damping controller design and structural optimization method based on PCC grid-connected voltage feedback channel is proposed to increase the amplitude-frequency response value of the oscillating frequency band and weaken the negative damping of the system. The sequence impedance model of grid-connected inverter is established, and the damping control branch is added in the current inner loop. The damping controller based on voltage feedback channel is designed by PCC voltage. The damping controller structure is optimized by identifying the dominant parameters of the frequency domain dynamic response of the transfer function of the voltage feedback channel. The reconstructed impedance characteristic and time domain simulation results show that the damping control strategy based on voltage feedback channel proposed in this paper can effectively suppress low-medium frequency oscillation and improve system damping.
DOI: 10.3233/atde250746
Authors: Lei Lei, Zhanjun Gao, Wenhao Jian, Zhengchen Tao
Institution: Shandong University
Language: English
Subfield: Control and Systems Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W4414242016