LOW VOLTAGE APPARATUS ›› 2023, Vol. 0 ›› Issue (6): 18-22.doi: 10.16628/j.cnki.2095-8188.2023.06.003

• Research & Analysis • Previous Articles     Next Articles

Resonance Analysis and Suppression Strategy for Parallel Operation of Grid Connected Inverter

SHANG Yang1, WANG Yongsheng1, WEI Chao1, HUANG Haihong2   

  1. 1. Lu’an Power Supply Company,State Grid Anhui Electric Power Co.,Ltd.,Lu’an 237000,China
    2. School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,China
  • Received:2022-09-15 Online:2023-06-30 Published:2023-08-15

Abstract:

Aiming at the resonance risk of the parallel operation of multi grid connected inverters with LCL filter in weak pawe grid, the mathematical model of multi inverter parallel system is established. The resonance of multi grid connected inverter parallel system is analyzed. A new grid connected current feedback control strategy is adopted and the design parameters are optimized to improve the inverter phase and amplitude margins. The resonance of multi grid connected inverter parallel system can be effectively suppressed. Finally, two grid connected inverters are built in parallel on MATLAB/Simulink and experimental platform. The simulation and experimental results verify that the proposed strategy can be applied in the multi inverter parallel system.

Key words: weak power grid, multi grid connected inverters, current feedback control, resonance

CLC Number: