E3S Web Conf.
Volume 252, 20212021 International Conference on Power Grid System and Green Energy (PGSGE 2021)
|Number of page(s)||5|
|Section||Power Control Technology and Smart Grid Application|
|Published online||23 April 2021|
An improving control strategy for grid -connected current in weak grid
1 School of Automation and Electrical Engineering Lanzhou Jiaotong University, Lanzhou, China
2 School of Automation and Electrical Engineering Lanzhou Jiaotong University, Lanzhou, China
* Corresponding author: firstname.lastname@example.org
The traditional proportional feedforward control strategy can suppress the low order harmonics in the strong power grid, but in the weak power grid environment, the grid impedance will have an adverse impact on the stability of the system, resulting in the proportional feedforward control can not suppress the low order harmonics well. In order to solve this problem, a control strategy combining resonant feedforward and new repetitive proportional controller is proposed. Firstly, the stability of traditional proportional feedforward and resonant feedforward systems is analyzed and compared by impedance analysis method. Then, a new repetitive controller is added to suppress low order harmonics based on resonant feedforward control, and the stability of single-phase LCL grid connected inverter system is analyzed Matlab / Simulink is used to simulate and verify the system. The results show that the system stability and the ability to suppress low order harmonics are significantly improved.
© The Authors, published by EDP Sciences, 2021
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