A Method for Improving Robustness of Grid-Connected Inverter System with Control Delay

2018 4th International Conference on Environmental Science and Material Application

生态环境科学;材料科学

Zhao, Yating^1

School of Electrical Automation Engineering, Nanjing Normal University, Nanjing

210023, China^1

关键词: Capacitive currents;    Digital control delays;    Grid connected inverters;    High frequency attenuation;    High frequency HF;    MATLAB /simulink;    Negative damping;    Stability margins;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/252/3/032192/pdf
DOI  :  10.1088/1755-1315/252/3/032192

来源: IOP

【 摘 要 】

In the grid-connected inverter system, due to the existence of digital control delay, the inverter presents the characteristic of negative damping. The traditional damping method is usually the form of capacitive current feedback, but the stability margin of the system is very low. Passive damping can improve the stability margin of the system, but it increases the loss of the system and reduces the high-frequency attenuation characteristics of the filter. Therefore, this paper considers the use of active + passive damping, while ensuring the system phase margin, reducing the loss as far as possible, improving the filter's high-frequency filtering characteristics. Finally, the simulation model is built in Matlab/Simulink, and the correctness of the theoretical analysis is verified by simulation.