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- Title
A Double Update PWM Method to Improve Robustness for the Deadbeat Current Controller in Three-Phase Grid-Connected System.
- Authors
Yang, Ling; Chen, Yandong; Luo, An; Huai, Kunshan; Zhou, Leming; Zhou, Xiaoping; Wu, Wenhua; Tan, Wenjuan; Xie, Zhiwei
- Abstract
In the grid-connected inverter based on the deadbeat current control, the filter inductance variation and single update PWM affect the distortion of the grid current, stability, and dynamic of the system. For this, a double update PWM method for the deadbeat current controller in three-phase grid-connected system is proposed, which not only effectively decreases the grid current distortion and control delay, but also improves the system stability and dynamic response speed due to reducing the characteristic root equation order of the closed-loop transfer function. The influence of the filter inductance deviation coefficient on the system performance is analyzed. As a conclusion, the corresponding filter inductance deviation coefficient in the system critical stability increases with increase in the parasitic resistance of the filter inductance and line equivalent resistance and decreases with increase in the sampling frequency. Considering the system stability and dynamic response, the optimal range of the control parameters is acquired. Simulation and experimental results verify the effectiveness of the proposed method.
- Subjects
PULSE width modulation; SMART power grids; ELECTRIC currents; ELECTRIC inductance; ELECTRIC filters
- Publication
Journal of Electrical & Computer Engineering, 2018, p1
- ISSN
2090-0147
- Publication type
Article
- DOI
10.1155/2018/2972379