TY - GEN
T1 - Control of grid-tied inverter with L filter in weak grid considering grid impedance and harmonics
AU - Tu, Hao
AU - Xu, Bei
AU - Chen, Siyuan
AU - Liang, Xinyu
AU - Du, Yuhua
AU - Lukic, Srdjan
N1 - Publisher Copyright:
© 2018 IEEE.
PY - 2018/12/26
Y1 - 2018/12/26
N2 - Inductor filter is widely used in grid-tied inverters. If an inverter with inductor filter operates in weak grid condition, voltage measurement error may exist due to the voltage sensor delay and the voltage drop on grid impedance. This can further lead to errors in the phase lock loop (PLL) and even system instability. In this paper, we analyze the voltage measurement error in weak grid condition in detail. All the essential elements in the measurement chain are considered. Analysis shows large DC offset and harmonic components may exist in the sampled voltage. To improve the PLL performance in weak grid condition, a PLL with extra DC offset and 2nd order harmonic rejection capability is presented. Further, the inverter current controller is designed considering grid impedance and grid harmonics. Experiments are performed to verify the presented method.
AB - Inductor filter is widely used in grid-tied inverters. If an inverter with inductor filter operates in weak grid condition, voltage measurement error may exist due to the voltage sensor delay and the voltage drop on grid impedance. This can further lead to errors in the phase lock loop (PLL) and even system instability. In this paper, we analyze the voltage measurement error in weak grid condition in detail. All the essential elements in the measurement chain are considered. Analysis shows large DC offset and harmonic components may exist in the sampled voltage. To improve the PLL performance in weak grid condition, a PLL with extra DC offset and 2nd order harmonic rejection capability is presented. Further, the inverter current controller is designed considering grid impedance and grid harmonics. Experiments are performed to verify the presented method.
UR - https://www.scopus.com/pages/publications/85061526790
U2 - 10.1109/IECON.2018.8591472
DO - 10.1109/IECON.2018.8591472
M3 - 会议稿件
AN - SCOPUS:85061526790
T3 - Proceedings: IECON 2018 - 44th Annual Conference of the IEEE Industrial Electronics Society
SP - 1103
EP - 1108
BT - Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 44th Annual Conference of the IEEE Industrial Electronics Society, IECON 2018
Y2 - 20 October 2018 through 23 October 2018
ER -